identifier: Furlong, Carol A. <https://research.library.mun.ca/view/creator_az/Furlong=3ACarol_A=2E=3A=3A.html>   (1990) A study of female offenders in Canada with particular reference to educational programs.  Masters thesis, Memorial University of Newfoundland.

abstract: This paper is an historical and descriptive analysis of female offenders, with particular emphasis on those in Canada. Due to limited resource material on Canadian female offenders, much of the data and information are based on American and British research, with occasional reference to other countries. -- Most of the research for this paper was conducted between 1983 to 1985, however there are some references to more recent material and events. -- In order to gain information on female offenders in Newfoundland, a visit was made to the provincial prison for women in Stephenville in August 1985. During this visit I was also given a tour of the building. -- In order to give a complete  overview of female offenders the thesis deals with several aspects related to them, including a general examination of deviance; who female offenders are and what happens to them once caught, including the judicial process and penal system; available services and programs; and the role of education as a rehabilitative factor. -- The overall theme of this study deals with the many problems female offenders face. Some of these problems are contributing factors to their criminal activity and some of the problems are inherent in the criminal justice system.


identifier: Woodfine, Bernard M. <https://research.library.mun.ca/view/creator_az/Woodfine=3ABernard_M=2E=3A=3A.html>   (1989) Predicting success for graduate students on the Master of Education programme in Educational Administration at Memorial University of Newfoundland.  Masters thesis, Memorial University of Newfoundland.

type: Thesis NonPeerReviewed

format: application/pdf application/pdf

abstract: This study attempted to isolate a number of factors (variables) associated with achieving graduate school success in the Master of Education degree program at Memorial University of Newfoundland.  Eleven variables were examined as possible predictors of graduate school success.  Each predictor variable was correlated with each of four measures of graduate school success. -- Overall undergraduate grade average, undergraduate grade average in the last 20 courses completed, undergraduate grade average in education courses, undergraduate major area of study, grade level of undergraduate education degree training, years of teaching and administration experience, possession of administrative experience, sex, age, full or part-time program status and thesis or non-thesis program option were examined as possible predictors of graduate school success.  Attainment of degree, administrative success, career success and graduate grade average were used as measures of graduate school success. -- Based upon the correlational analysis completed, an interesting result was the relative strength of sex, age, years of teaching/administrative experience and undergraduate education course average as possible predictors of graduate school success. -- Correlations were found to be quite low.  However, these correlations were similar to those found in previous research.  The use of non-continuous variables such as sex and program status in a correlational analysis of this type could be questioned and recommendations based upon these variables must be viewed with caution. -- Stepwise multiple regression analysis indicated that the best predictors of graduate grade average were undergraduate average in the last 20 courses completed, years of teaching and/or administrative experience, possession of administrative experience and major area of undergraduate study.  Best predictors of career success included thesis/non-thesis program option and possession of administrative experience. -- A stepwise multiple regression analysis could not be performed on either administrative success or attainment of degree possibly due to the high intercorrelations between the predictor variables.  Undergraduate average in the last 20 courses was the only predictor significantly correlated with administrative success while type of attendance was the only predictor significantly correlated with attainment of degree. -- Results of this study question certain currently used admission criteria and seem to validate other admission criteria Given the tentative nature of certain correlations, generalizations of results were cautioned.


identifier: Taylor, Nancy Ann Marie <https://research.library.mun.ca/view/creator_az/Taylor=3ANancy_Ann_Marie=3A=3A.html>   (1989) The development, implementation and evaluation of a group therapy program for sexually abused female adolescents.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this study was to develop, implement and evaluate a group therapy program for sexually abused adolescents. -- The therapy group developed by the researcher was a 12 week structured program based on the situation/transition group model.  The effects of sexual abuse on its victims, the needs of adolescence, and the curative components of group therapy provided the framework for the development of the group therapy program examined in this study. -- The implementation of the program was a three phase project spanning over a year, from April 1986 to June 1987.  A pilot group and a trial group were valuable precursors to the group evaluated in this study.  All three groups were conducted in St. John's, Newfoundland at the offices of the Adolescent Health Counselling Services. -- The evaluation of the group therapy program was composed of two components; outcome evaluation and process evaluation. -- The outcome evaluation involved the adolescents completing a Needs Assessment Questionnaire prior to the commencement of the group to help them identify their individual needs and goals.  Following completion of the group the members evaluated how successful the group was in helping them meet these needs and goals in a Final Evaluation Questionnaire.  The results showed that the group therapy program was a helpful form of treatment for the sexually abused adolescents who participated in this study.  The degree of helpfulness varied amongst the members. -- Another component of the outcome evaluation required the adolescents to complete a pre and posttest standardized self-image questionnaire.  The results of the Offer Self-Image Questionnaire showed that following the group experience, five adolescents had shown a significant positive change in their total scores, one adolescent had shown a significant negative change and two adolescents had shown no significant change. -- The process component of the evaluation involved a session by session evaluation of various group processes occurring throughout the group therapy program.  The instruments used in this phase of the evaluation included a Group Climate questionnaire, a Session Evaluation Questionnaire, and a Participation Questionnaire.  The results of these questionnaires allowed the group leaders to identify helpful and not so helpful processes occurring within the group, focus on individual members needs and plan the following sessions accordingly. -- Another component of the process evaluation included the group members' identifying the most and least helpful curative factors of group therapy in the Final Evaluation Questionnaire. -- The process evaluation was considered a critical contributing factor to the successful results of the outcome evaluation of this study.


identifier: Caldera, Manora Kumudinie <https://research.library.mun.ca/view/creator_az/Caldera=3AManora_Kumudinie=3A=3A.html>   (1986) Multi-frequency digital communications in underwater channels.  Masters thesis, Memorial University of Newfoundland.

abstract: Strong multipath conditions which exist particularly in a shallow water acoustic channel make conventional coherent transmission schemes ineffective. To this end many non-coherent detection schemes employing frequency diversity have been proposed to improve transmission reliability. -- In this thesis, a novel transmission scheme based on the Sliding Discrete Fourier Transform (SDFT) is proposed for communicating in multipath acoustic channels and it's performance is evaluated analytically and by computer simulations. The system described uses constant envelope multi-frequency signals. Since the envelope of the received signal varies depending on the intensities of the direct path and multipath signals, it is assumed that an Automatic Gain Controller (AGC) stabilizes the received signal before carrying out the demodulation. Due to the non-linearity effect of the AGC process, the analytical evaluation is complicated for the case with AGC. Hence the analytical evaluation is carried out only for the case with no AGC at the receiver. -- First, the variation of eye opening with Direct to Multipath Ratio (DMR) and the minimum DMR required  for correct detection are determined. Then the effect of the  synchronization error at the receiver on the eye opening is obtained. Finally, the error performance of the signal in the presence of Gaussian noise is evaluated for various DMR values. -- A computer simulation is carried out for the case  with an AGC at the receiver. By generating sequences of random data for transmission, the eye patterns of the received signals are obtained. The variation of DMR with the  distance between the transmitter and the receiver is also plotted for various transmitter-receiver locations and configurations. -- Based on the results obtained, the proposed system is shown to be a reliable communication scheme in underwater channels.


identifier: Wang, Zhiguo <https://research.library.mun.ca/view/creator_az/Wang=3AZhiguo=3A=3A.html>   (1992) A study of roll motion and roll damping for biased small fishing vessels.  Masters thesis, Memorial University of Newfoundland.

abstract: Three sets of experiments with small fishing vessel models in biased condition were conducted at the towing tank of Memorial University of Newfoundland. A simulation of the asymmetric rolling motion of one of the models in beam waves without forward speed was also performed. -- The first set of experiments was carried out with three fishing vessel models denoted by M363, M365 and M366 to measure the roll damping. Hundreds of decay curves were obtained from free roll tests for the analysis of biased roll damping coefficient. The Energy Approach developed by Haddara [10] was applied in the analysis. The results show that the nondimensional equivalent linear damping coefficient ζΕ increases linearly with average amplitude of roll angle. The effect of bias angle on roll damping varies from model to model. In the case of M366, ζΕ increases linearly with bias angle. The same tendency is seen for M365 when its roll amplitude is larger than ten degrees. However, ζΕ decreases with bias angle when the roll amplitude is lower than ten degrees. In the case of M363, the damping coefficient ζΕ shows a nonlinear relationship with bias angle for low roll amplitude, i.e. ζΕ decreases with bias angle first, then increases. For the large roll amplitude, ζΕ increase with bias angle almost linearly. -- The second set of experiments was carried out with M363 in regular beam waves without forward speed. The model was tethered in drift and yaw but all other modes were free. The model was set under two different bias conditions and was tested both biased towards the wave source (wave maker) and away from the wave source. The results indicate that the effect of bias angle is pretty slight. -- The last set of experiments was performed also with M363 in beam waves without forward speed but the model was restrained through a pivot in every mode except for roll. The pivot was placed at the model's roll center in the first group of tests; for the second group of tests, the pivot was transversely moved to a new position whose transverse coordinate is the model's actual center of gravity and vertical coordinate was unchanged. The results can be summarized as follows. -- When the model was biased towards the wave source the roll amplitude was much larger, compared with when the model was biased away from the wave source or under no bias condition. -- In the frequency domain, the roll amplitudes show a strong resonant phenomenon when the model is biased towards the wave source or under no bias condition. On the other hand, the curve of roll amplitude with respect to the wave frequency is fairly flat when the model is biased away from the wave source. -- The results do not reflect any significant effect of pivot position. This is believed to be due to the very small distance between two pivot positions. -- The results from the simulation of the rolling motion of the biased M363 under restrained conditions show reasonable agreement with experimental results, especially for the tendency of roll amplitudes with respect to the wave frequency. It is also indicated by the simulation that not only bias and wave direction but restraints are factors which make the roll amplitude large when the model is biased towards wave source.


identifier: Rahman, Anisur <https://research.library.mun.ca/view/creator_az/Rahman=3AAnisur=3A=3A.html>   (2007) Canadian bottled water industry : technological, economic and environmental perspectives.  Masters thesis, Memorial University of Newfoundland.

abstract: This study presents an assessment of global freshwater resources, water supply and demand and safe drinking water issues with a focus on Canada in general and Newfoundland and Labrador in particular. Therefore, providing adequate freshwater to meet basic human needs must be done within the sustainable development policy, with proper planning and integrated approach considering environmental, ecological, socioeconomic, and political factors. It examines innovative water treatment technologies like, filtration process, ozonation and ultra violet (UV) radiation for water bottling development. A water quality analysis for nutrient minerals for major global bottled water brands are discussed in the light of World Health Organization (WHO) requirements. -- The study also evaluates an integrated water bottling system and environmental impact on the Gisborne Lake watershed area in Newfoundland and Labrador. This study also presents three scenarios of the transportation systems for bottled water export (i) by shuttle service to the United States (ii) by Suez vessels to the United States and (iii) by a modified Very Large Crude oil Carrier (VLCC) vessel to the Gulf countries specially to port facilities in Saudi Arabia, on their way back, from the proposed Newfoundland and Labrador Refining Corporation (NLRC) at Southern Head, Arnold's Cove region in the Placentia Bay, Newfoundland and Labrador, Canada. -- The study presents the feasibility for bottled water industry, environmental cost and explores the viability of the export of bottled water from Newfoundland and Labrador, to global markets. There seems to be considerable potential for bottled water export for Canada particularly for the economic development of Newfoundland and Labrador. The transportation cost for bottled water to the United States and the port facilities in the Gulf countries are about 2.0 to 7.0 cents per liter from Newfoundland and Labrador, which are not as high as is usually speculated and seems quite feasible, if planned properly.


identifier: Gowda, Sidde Deve <https://research.library.mun.ca/view/creator_az/Gowda=3ASidde_Deve=3A=3A.html>   (1979) Digital modelling for performance prediction of hysteresis motors.  Masters thesis, Memorial University of Newfoundland.

abstract: The performance prediction of the hysteresis motor depends largely on the success of optimized representation of the actual B-H loop of its rotor hysteresis material.  Digital simulation of the typical hysteresis materials like 175 cobalt steel, 36% cobalt steel and Oerstit-70 alloys having coercivity lying between 4 and 20 kA/m and remanent flux density lying between 0.8 and 1.3 T are carried out. The simulation is based on the modified Frölich’s approach. Reasonably close agreement is found between the simulated and those supplied by the power magnet manufacturing company. -- On the basis of parallelogram approximations analytical models of the circumferential-flux hysteresis motor have been given. The motor field equations are then solved, to predict the terminal quantities, using the digital B-H loop modelling. The air-gap power of the hysteresis motor is studied as a function of coercive force, remanent flux density, saturated relative permeability and unsaturated relative permeability of the hysteresis material. A series of tests were carried out using 17% cobalt steel hysteresis rotor. The reasonably close agreement between the terminal quantities predicted form the digital simulation and those measured experimentally validates the usefulness of digital simulation of the hysteresis motor.


identifier: Gangadharan, Sathya Narayan <https://research.library.mun.ca/view/creator_az/Gangadharan=3ASathya_Narayan=3A=3A.html>   (1986) Feasibility study of jet propulsion for remote operated underwater vehicles.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis is a feasibility study of jet propulsion for remote operated vehicles (ROV’s). The concept of using a tilting type nozzle for improved maneuverability is discussed. Though the propulsion efficiency of jets is less compared to that of the propeller for the velocity ranges usually encountered in ROV movements, the implementation of jet propulsion is considered in view of the advantages in improving maneuvering qualities. Also, the simplicity of the system and les complexity in pressure compensation adds to its advantages. This study concentrates on the selection of an optimum nozzle configuration for ROV’s. -- An experimental set-up was designed and fabricated for this investigation. Ten different plexi-glass conical nozzles were used for five different circular disk shaped drag plates, simulating the drag of the ROV motion under water. Energy losses were determined both experimentally and theoretically. Wall effects encountered in the experimental tank were compensated by towing the model in an open water wave tank for the same range of speeds. It was found that the propulsion efficiency is maximum for one particular nozzle over a wide range of flow rates encountered in the experiments. Finally, a feasible design of a jet propelled ROV with tilting type nozzles is presented. This design could be fabricated and tested for commercial production.


identifier: Azadeh-Tehrany, Ali-Reza <https://research.library.mun.ca/view/creator_az/Azadeh-Tehrany=3AAli-Reza=3A=3A.html>   (1983) Fracture toughness of fresh water ice and saline ice.  Masters thesis, Memorial University of Newfoundland.

abstract: Please see thesis for abstract.


identifier: Green, Herbert Paul <https://research.library.mun.ca/view/creator_az/Green=3AHerbert_Paul=3A=3A.html>   (1984) Geotechnical modelling of iceberg-seabed interaction.  Masters thesis, Memorial University of Newfoundland.

abstract: Exploratory drilling on the eastern Canadian continental shelf has proven the presence of commercially viable quantities of hydrocarbons. Any process to extract the resources from beneath the seafloor offshore Newfoundland and Labrador has to take into account the severe environmental condition some of which are unique to this geographic region. Damage to seafloor installations such as pipelines of wellheads by bottom dragging or scouring icebergs is one of the potential problems. This has been recognized since the early 1970’s. However, methods of estimating the maximum iceberg scour depths and methods of protecting seabed installations are still topics of research. -- In this thesis an experimental approach was taken to physically model the iceberg scour process in a 14 m x 3 m x 1 m towing tank. Cohesionless soil at a uniform slope and with controlled properties was used as the representative seafloor material. Iceberg models 500 mm wide and a pipeline model 122 mm diameter were instrumented and used in a text programme aimed primarily at examining the interaction of the iceberg model and the soil and delineating the influence of the scour process below the incision depth. -- For a horizontally scouring iceberg the frontal soil resistance was found to be the major affecting the scour size. The shape of the iceberg keel in contact with the soil was also found to be an important parameter in the scour process. The tests indicate that the zone of soil disturbance extends below the keel of the scouring iceberg. This zone of influence should be accounted for in the design of all buried installations in the Newfoundland and Labrador offshore region.


identifier: Chuang, Jiunn-Ming <https://research.library.mun.ca/view/creator_az/Chuang=3AJiunn-Ming=3A=3A.html>   (1984) Analysis of ship flow in an ideal fluid using Guilloton's method and spline functions.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis, the numerical evaluation is formulated for computing the linearized disturbance velocity of a steady, inviscid free surface gravity flow past a ship hull. The hull is represented by a system of source panels with uniformly distributed strengths on the centerplane. The improvement of the results on the boundaries, i.e. free surface and hull surface, by Guilloton’s method is investigated. Based on Guilloton’s method, thin-ship-panel approximation and cubic  spline curve fitting, a scheme has been developed for setting up a computer program to compute the ship wave-making resistance, flow around the ship hull and wave elevation along the ship side. The results of sample calculations for standard hull forms of Wigley model 3012 and Series 60 block 60 have shown good agreement with the experimental results for Froude numbers between 0.25 and 0.35 which are just in the speed range of the conventional merchant ships.


identifier: Ruprai, Manohar S. <https://research.library.mun.ca/view/creator_az/Ruprai=3AManohar_S=2E=3A=3A.html>   (1987) Behaviour of model flexible piles under inclined loads in sand.  Masters thesis, Memorial University of Newfoundland.

abstract: The increasing use of fixed offshore platforms supported by pile foundations has encouraged the development of more rational methods of analysis of piles subjected combined axial and lateral loading. The combination of large lateral loads resulting from the action of wind, waves and currents in conjunction with vertical loads has created the need to analyze systems exposed to large inclined loads. -- The scope of this thesis is to study the pile-soil interaction of a vertical flexible pile under inclined loadings in dense sand. To study the interaction, model flexible piles of 25 mm, 42 mm and 60 mm diameters were jacked into sand with controlled density. These model piles were instrumented with load-cells and strain-gauge bridges to measure the bending moment distributions. The piles were tested under vertical, horizontal and inclined loads using a computerized data acquisition system. A suitable soil container and laboratory test frame were assembled to conduct the tests. -- The vertical load test results indicated that the value of the bearing capacity factor Nq was constant with depth and consistently smaller than that predicted by various existing theories. The results also indicated that the piles had a critical depth where the point resistance became constant with depth, at a pile diameter/depth ratio of about 20. -- Experimental p-y curves were compared with those proposed by Reese et al (1974), Matlock et al (1980), Scott (1980) and Parker (1970). The test data indicate that the semi-empirical methods underestimate the ultimate resistance near the pile head and overestimate it at depth. Computed response of piles under test conditions showed good agreement with the measured response. -- The ultimate load capacity under inclined load decreases with load inclination, with a rapid reduction for load inclinations between 45 and 90 degrees. Compared to a pile subjected to only lateral load, the vertical load on the pile increases the lateral deflections by about 4 to 15%, and the maximum moment in the pile section by about 8 to 16% for load inclinations from 60 to 30 degrees.


identifier: Stone, Barry Michael <https://research.library.mun.ca/view/creator_az/Stone=3ABarry_Michael=3A=3A.html>   (1986) An experimental study of the motion response in regular waves of a semisubmersible under damage conditions.  Masters thesis, Memorial University of Newfoundland.

abstract: The determination of motion response characteristics, and therefore operating limits, of semisubmersibles in normal even keel conditions has been extensively reported in the literature. However, the extension of this work to vessels which have undergone some form of damage leading to loss of buoyancy and abnormal heel and trim angles is limited. -- to establish the motion response of a typical semisubmersible in both even keel and damage conditions, and resulting changes relative to severity and direction of damage, a model study using a 1/100 scale model of a moored, four column, twin pontoon semisubmersible has been conducted. For each wave direction of head, beam and quartering seas, tests were undertaken at five angles of trim and heel: even keel; two towards (windward damage), and two away (leeward damage) from the waves in 7 m regular seas with periods of 7 to 25 sec. In all cases six degrees of freedom motion response was obtained. -- The RAO curves for small angles of trim and heel show little change from even keel, operating draft. However, at large angles, with pontoons and deck structure piercing the water surface, substantial increases in roll and, particularly pitch motion, occurred over a band of wave periods of 9 to 13 sec. Over this band all motions contained not only the wave frequency but also a significant subharmonic component at half the wave frequency. Under these conditions leeward damage consistently produced the largest motion. The most extreme motion measured resulted in a pitch RAO of 2.9 or 19.8° for a wave height of 6.9 m at a wave period of 12 sec. in quartering seas. -- Further work using realistic irregular seas to obtain additional insight into nonlinear effects over the subharmonic or parametric resonance frequency band has been recommended.


identifier: Dahanayake, Bandula Wickramaratna <https://research.library.mun.ca/view/creator_az/Dahanayake=3ABandula_Wickramaratna=3A=3A.html>   (1983) An investigation of constant velocity gradient effects in seismic analysis.  Masters thesis, Memorial University of Newfoundland.

abstract: Information concerning acoustic velocities plays an important role in seismic analysis. Acoustic velocity of the medium can be approximated by a polynomial function of depth. The concept that velocity varies linearly with depth has been considered by many researchers as an appropriate assumption for developing the velocity profile for a medium. -- In this study the linear velocity profile approach has been used to estimate the parameters of the medium. The normal moveout relationship for a single zero-dipping reflector has been derived. A methodology for obtaining the parameters such as the reflector geometry and the constant velocity gradient of the medium from the surface observable x-t data is presented. -- Further, the linear velocity profile model for a sloping reflector has been derived based on the normal ray analysis. Based on the knowledge of the velocity profile the least squares technique has been used to identify the reflector geometry from reflection data. The x-t data has been obtained by shifting the shot/receiver position progressively. A comparative analysis has been made to obtain the effect of constant velocity gradient in seismic analysis.


identifier: Russell, Wilson E.,(Wilson Eric) <https://research.library.mun.ca/view/creator_az/Russell=3AWilson_E=2E,=28Wilson_Eric=29=3A=3A.html>   (1973) Current studies in the Labrador current with respect to the motion of Icebergs.  Masters thesis, Memorial University of Newfoundland.

abstract: Currents were measured in an area of the Labrador current off the Coast of Newfoundland. The measurements were made at four stations over a period of three days. Three of the stations were along a two-mile line perpendicular to the expected mean flow. The fourth station was six miles upstream of the other three. Of the eight current measuring meters which operated successfully, three were at depths of approximately 15 m, two at 65 m and one each at 106 m and 218 m. -- The currents were found to be rotary in a clockwise direction. A comparison with theory showed that the near-surface currents were of an inertial nature; the measured periods of the near-surface currents being almost equal to the theoretical inertial period of 15.5 hrs. A curve was constructed showing the form of the correlation between the rotary currents at different depths at one of the stations. A vertical spiral effect similar to the Ekman spiral but rotating in time was interpreted from the shape of the curve. -- A study of measured iceberg tracks showed that the loops sometimes made by icebergs could quite possibly be caused by inertial current effects. One particular track which included several loops was examined in detail. The period and radius of the looping motion were found to be in the ranges of the inertial period and radius of influence. -- Geostrophic current profiles were constructed for a line near our research area. The oceanographic data used were obtained through the Canadian Oceanographic Data Centre and came originally from the International Ice Patrol. In the years 1961 to 1964 the oceanographic data were obtained using nansen casts while from 1965 onward the data were obtained using a Bisset-Berman, Salinity/Temperature/Depth (STD) Environmental Profiling System. All data were measured at approximately the same time of year. There were order-of-magnitude consistencies from profile to profile. It was hypothesized that a significant inertial current could result from a geostrophic current if the driving force behind the geostrophic current disappeared.


identifier: Rhinelander, Jason P. <https://research.library.mun.ca/view/creator_az/Rhinelander=3AJason_P=2E=3A=3A.html>   (2003) Design and implementation of encryption algorithms in a coarse grain reconfigurable environment.  Masters thesis, Memorial University of Newfoundland.

abstract: In early 2000, Chameleon Systems Incorporated and Memorial University formed a research agreement to evaluate the viability of the Chameleon Systems CS2112 Reconfigurable Communications Processor (RCP) for use in implementing popular cryptographic algorithms. The CS2112 has a coarse grain reconfigurable architecture, capable of run time reconfigurability. -- The benefit of coarse grain reconfigurable architectures is that they can offer many of the flexibilities found in software, such as reprogrammability and ease of modification to implementation, while giving performance advantages of speed and hardware encapsulation. -- This research involves examining the implementation characteristics of two popular symmetric key block ciphers, RC5 and RC6, and two popular cryptographic hash algorithms, MD5 and SHA-1 with respect to the CS2112. -- RC5 was designed as an iterative loop and then expanded to provide a parallel pipeline to maximize the usage of the reconfigurable fabric. RC6 was designed as an iterative loop and a pipeline. For both hash algorithms, initial designs were drafted and performance figures were estimated from experience gained through simulation and testing on a CS2112 development board. -- By implementing these algorithms, the architecture of the CS2112 was evaluated for its suitability for cryptographic applications. Moreover, the reconfigurable fabric of the CS2112 was evaluated with respect to its support for the primitive operations that are required for cryptographic algorithms.  -- The conclusions of this research and recommendations for future research are directly related to resource use on the CS2112. In particular, support for control and datapath logic, memory space, and global communication resources within the CS2112 were all design constraints. More specifically, it would be advantageous to have direct support for accessing memory without using datapath resources. Also hardware support for data dependent logical rotations and unsigned integer multiplications would greatly save resource usage and increase performance. Finally the design process for the CS2112 was sometimes time intensive and cumbersome, especially with respect to layout and placement of reconfigurable logic. Advances in the area of automatic placement and layout for coarse grain primitives would benefit the design process for the CS2112 greatly.


identifier: El-Tahan, Hussein Wahba Mohamed <https://research.library.mun.ca/view/creator_az/El-Tahan=3AHussein_Wahba_Mohamed=3A=3A.html>   (1977) Dynamic analysis of the 'cut-and-cover' type underground nuclear reactor containment.  Masters thesis, Memorial University of Newfoundland.

abstract: Nonlinear dynamic structure-medium interaction for ‘cut-and-cover type’ underground nuclear reactor containments is studied for earthquake excitation. The structure considered is a reinforced concrete containment for a 1100 - MWe power plant buried in a dense sand medium. The analysis has been carried out using the recently developed computer programmes: LUSH (plane-strain finite element), and SHAKE (one-dimensional wave propagation analysis). The high frequency ranges, which must be considered in the study of soil-structure interaction for nuclear power plants, and the nonlinear soil behaviour during strong earthquakes are adequately taken into account in this study. -- Parametric studies for the response of the containment and the surrounding medium are carried out for: 1) containment shape (high horseshoe, flat horseshoe and semi-circular roof-vertical walls), 2) relative stiffness of the containment and the medium, 3) depth of burial of the containment (shallow, intermediate and deep embedments), 4) relative stiffness of the medium and filling material (original fill, loose sand, stabilized sand and reinforced earth), 5) thickness of the backfill jackets (10ft. and 70ft.), 6) isolation of the containment using energy absorbing jackets around the containment (polyurethane foam and foamed concrete), and 7) type of surrounding medium (sand and rock). Comparative studies are presented for rock vs. sand siting and aboveground vs. underground siting in sand. -- The response values determined are: i) time history of acceleration, displacement and stresses, ii) maximum stresses and maximum accelerations, and iii) acceleration response spectra. Plotting of these results using the CALCOMP Plotter involved writing of twelve computer programmes. -- The results indicate that: i) The high horseshoe shape is the best among the three shapes considered decreasing the containment stresses by 10-20%, ii) Flexible containments are better than rigid ones, iii) Successive reductions in containment stresses to 67% of the initial values are associated with each additional 70ft. embedment depth, iv) The relative stiffness of the filling material and the medium has the most significant effect on the response. The lower the modulus of elasticity of the filling material, the greater is the reduction in the containment and medium stresses. A filling material with stiffness 30% lower than that of the medium, reduces the stresses by 30% in the containment, and about 20% in the medium, v) Using a jacket of energy absorbing material (polyurethane foam) in a sand medium reduces the containment and medium stresses by 65% and 40% respectively, vi) A reduction in the containment stresses of about 20% is achieved using a reinforced earth jacket, vii) Increasing the width of the backfill side-cover increases the stresses in the containment and the medium, viii) The response values of the medium near the containment are considerably affected by the interaction. The interaction effect is larger for aboveground siting, and ix) A containment in the sand medium is subjected to dynamic loading higher than that for a rock medium. -- Recommendations are made for further studies to account for more realistic modelling and material behaviour, and more complex plant configuration and structural details.


identifier: Joglekar, Nitindra R. <https://research.library.mun.ca/view/creator_az/Joglekar=3ANitindra_R=2E=3A=3A.html>   (1984) Effect of the loss of tether stiffness on the behavior of a tension leg platform.  Masters thesis, Memorial University of Newfoundland.

abstract: A numerical model for the hydrodynamic analysis of a Tension Leg Platform has been implemented using strip theory. A computer algorithm has been developed using a beam elements for a large displacement nonlinear analysis of the cable network. -- A parametric study of the platform motion response and tension variations has been made for cases of loss in the cable stiffness. It has been shown that if the total tension remains constant, the surge motion will not be affected but the heave and pitch motions will be increased and tether tensions will vary significantly.  The tether tensions are affected by the lateral cable dynamics.


identifier: Reddy, Satti Vijaya Bhaskara <https://research.library.mun.ca/view/creator_az/Reddy=3ASatti_Vijaya_Bhaskara=3A=3A.html>   (1977) Finite element formulation of viscous sea ice model.  Masters thesis, Memorial University of Newfoundland.

abstract: The steady drift of sea ice in the Arctic Basin has been calculated by using the Finite Element Method, assuming that the ice is a viscous material. The Arctic Basin is discretized into 9 x 13 square elements of size 250 km by 250 km. The constitutive relations proposed by Glen 1970 have been used in the modeling. The momentum and continuity equations are solved for the ice velocity due to wind stress ocean current and ocean tilt. The drift has been calculated for four seasons in a span of two years by using proper viscosities in summer and winter. The vector addition of ice velocities due to wind, ocean current and tilt are plotted as combined velocities for all four seasons Summer 1, Winter 1, Summer 2 and Winter 2. -- The results of the Finite Element Method of analysis are compared with that of the Fourier Transform Method (Hibler, 1976) and it is found that the results obtained by both methods agree with each other in the middle of the Basin. A comparison between skip and no slip boundary condition is also presented. Boundary elements are used and an iterative procedure is followed to incorporate the nonlinear boundary conditions. -- A non-steady drift of pack ice in the Strait of Belle Isle, which moves back and forth due to tidal streams and current have been calculated by the finite element method formulation. It is observed that the pack ice velocities are harmonic as are the water velocities but with a time lag which depends upon viscosity parameters of ice. -- Various velocity fields have been plotted and all patterns of calculated velocities are observed to be realistic.


identifier: Chaudhuri, Saurendranath <https://research.library.mun.ca/view/creator_az/Chaudhuri=3ASaurendranath=3A=3A.html>   (1979) Free fall impact penetration tests on soils.  Masters thesis, Memorial University of Newfoundland.

abstract: The hydrosphere which is still the unexplored frontier of our planet is receiving the special attention of scientists and engineers because of its vast potential. A comprehensive knowledge of the properties of marine sediments is essential for most engineering activities in the oceans. A free fall penetrometer designed and developed at Memorial University is a potential tool for a quick and economic evaluation of the geotechnical properties of the top few metres of surficial ocean sediments. -- In addition to measuring the cone resistance and sleeve friction, the deceleration is measured by an accelerometer mounted within the penetrometer. These quantities are then used for correlating the shear strength of the soil at different depths of penetration. Laboratory experiments were conducted with two types of soil targets. -- Test results show that an increase in soil strength and roughness of the penetrometer cone material would cause a substantial increase in cone resistance and decrease in maximum penetration depth. Cone angles and weight per unit area of the penetrometer have also significant influence on the cone resistance and penetration depth. The effect of all these parameters on penetration behavior are discussed. -- The mode of soil failure at low velocity penetration was assumed to be similar to a conventional quasi-static case as proposed by Meyerhof (1961). It was observed that results of free fall penetration tests showed a greater penetration resistance, compared to the standard quasi-static tests. However, when the results were translated into computation of the angle of shear resistance, the difference was insignificant. For cohesive soils penetration resistance is dependent on the penetration velocity. ‘Strain-rate effect’ was found to influence the results. ‘Static’ strength for clays from ‘dynamic’ strength profiles can, however, be obtained taking the ‘strain-rate effect’ into account.


identifier: Philip, Varghese <https://research.library.mun.ca/view/creator_az/Philip=3AVarghese=3A=3A.html>   (1984) Effects of cochannel interference on MSK and OQPSK signals in satellite channels.  Masters thesis, Memorial University of Newfoundland.

abstract: The implementation of frequency-reuse techniques and sharing of the same frequency band with terrestrial microwave networks have increased the levels of cochannel interference in satellite communication systems. In fact, in certain situations such an interference can become the dominant factor in limiting the system performance. In this thesis, we analyze the effect of cochannel interference on the error rate performance of MSK and OQPSK signals transmitted through a satellite channel. -- The satellite channel is assumed to exhibit both amplitude and phase nonlinearities. The system model assumed a sufficiently large bandwidth so that the intersymbol interference may be neglected. Narrowband Gaussian noise is assumed on both links but the cochannel interference is considered only in the uplink. -- The bit error rate expressions are derived for MSK and OQPSK signaling techniques in the form of infinite series containing double integrals. The effect of multiple cochannel interference is evaluated using these expressions. A simple expression which does not contain infinite series is also derive for evaluation the bit error rate when only one cochannel interferer is present. The effect of the TWT input power backoff on the bit error rate is also analyzed. The error rate expressions are evaluated over a range of uplink and downlink signal to noise ratios. -- The following conclusions are drawn from this study: -- (a) MSK is superior to OQPSK for all uplink and downlink signal to noise ratios for hard-limited and TWT channels. -- (b) The optimum operating region is the saturation region for both signaling schemes. -- (c) The hard-limited model is a good replacement for the TWT model for low uplink SNR for both the signaling techniques.


identifier: Cooray, M. Francis R. <https://research.library.mun.ca/view/creator_az/Cooray=3AM=2E_Francis_R=2E=3A=3A.html>   (1986) Electromagnetic scattering by dielectric prolate spheroids.  Masters thesis, Memorial University of Newfoundland.

abstract: Exact solutions are obtained for scattering of a monochromatic plane electromagnetic wave of arbitrary polarization and angle of incidence by a single dielectric prolate spheroid and a system of two dielectric prolate spheroids in parallel configuration. Modal series expansions of electromagnet fields in terms of normalized prolate spheroidal vector wave functions are used to obtain these solutions. The prolate spheroids are composed of homogeneous and perfect dielectric material, and are assumed to be embedded in a non-lossy infinite homogeneous and isotropic medium which contains the incident place electromagnetic wave.  The medium and the scatterers are all assumed to be non-ferromagnetic (magnetic permeabilities of the material of each spheroid and that of the medium assumed to be approximately equal to the permeability of free space) with no free charge in any region. -- The field solution gives the unknown coefficients in the series expansions of the scattered and transmitted fields, in terms of the known coefficients in the series expansion of the incident field by means of a matrix transformation, in which the system matrix depends only on the scatterer ensemble. This eliminates the necessity for repeatedly solving a new set of simultaneous equations to obtain the unknown expansion field coefficients for a new direction of incidence. Numerical results are given as curves of bi-static and back-scattering cross-sections for a variety of prolate spheroids composed of dielectric materials of different refractive indices. Moreover, for two body scattering, different parallel configurations and mutual separations of the two spheroids are also considered.


identifier: Donnelly, Roderick Kerry <https://research.library.mun.ca/view/creator_az/Donnelly=3ARoderick_Kerry=3A=3A.html>   (1983) Electromagnetic scattering from a half-space vertical discontinuity: operator decomposition approach.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis the so-called “mixed-path’ propagation problem is tackled by modelling the physical geometry and the various electromagnetic field quantities with the aid of Heaviside step functions in the manner of Walsh (29). Operating on the regional field quantities with the usual vector differential operators produces the classical boundary conditions of electromagnetism that are normally supplied in the classical analyses. The Helmholtz-type equations obtained for the regional field quantities are convolved with the proper Green functions and then Fourier transformed. An algebraic equation in the transform domain for the surface field to the right of the media interface is thus obtained. In order that this equation may be solved, various approximations are made in order that Wiener-Hopf method may be successfully applied. The final answer, which is in the form of an asymptotic expansion of a Fourier inversion integral, is of the wrong order in field strength fall-off when compared with other authors’ results and empirical evidence. Discussion is given as to the suitability and limitations of the Wiener-Hopf method for application to the problem.


identifier: Nandakumar, V. <https://research.library.mun.ca/view/creator_az/Nandakumar=3AV=2E=3A=3A.html>   (1984) Enhancing reliability of project duration forecast.  Masters thesis, Memorial University of Newfoundland.

abstract: Reliability of Project duration forecast depends mainly on the accuracy of the activity duration estimates. During project implementation, many uncertain but predictable variables dynamically affect the activity duration. Currently, this impact is considered intuitively, the effectiveness of which depends on the skill of the scheduling engineer. This research identifies the need for a model which can simulate the project environment to incorporate the combined impact of the uncertainty variables in the activity duration estimates. -- Significant uncertainty variables are discussed along with random sampling procedures for quantifying their impact. A computer model “PRODUF” simulates and incorporates the combined impact in activity duration estimates. PRODUF computes a distribution of duration estimates for each activity. Monte Carlo simulation on such distributions gives a probability distribution for the tactical plan completion time. This is used at every progress review to develop project duration forecast from the strategic plan. -- The PRODUF model has many applications. It can be used to generate forecast of project duration with associated probability. The sensitivity of the activities to an uncertainty variable can be measured. As an extension of PRODUF, an improvised gaming model in project scheduling can be developed. Application of PRODUF to a hydro project highlights its practicality.


identifier: Sarna, Surinder K. <https://research.library.mun.ca/view/creator_az/Sarna=3ASurinder_K=2E=3A=3A.html>   (1978) Investigation of some factors affecting physiological load and work performance of fish filleting operators.  Masters thesis, Memorial University of Newfoundland.

abstract: The primary objective of this study was to observe the relationships between operator’s  work performance (speed of filleting and actual output rate of round codfish as well as of fillets) and his physiological parameters (mean heart rate, blood pressure and product of mean heart rate and blood pressure) during codfish filleting operation, and at the same time collect sufficient data to observe the effect of factors, such as speed of filleting and size of fish on the actual output rate and percentage yield of filleting. The effect of size of round codfish filleted on mean heart rate and normal output rate (round fish as well as fillets) of the filleting operator was also investigated. -- This study was carried out at a small fish processing plant. Four average skilled male filleting operators were selected with the help of plant supervisors. Each subject was asked to work at five different filleting speeds, on an individual type filleting table layout. “Head on-gut in” codfish was supplied to each operator in 75 lb. boxes. A total of about 2625 lbs. of round codfish was processed during this study. A total of 35 individual experiments were performed. The actual time of filleting each box of 75 lbs. round codfish, performance rating (speed of filleting), number of codfish/75 lb. box, weight of skin-on fillets, operator’s mean heart rate and blood pressure (both systolic and diastolic) were recorded for each filleting experiment.  -- Within the range and scope of this study, the analysis of the results indicated following trends: -- 1. Significant linear positive relationship between speed of filleting and mean heart rate of the operator. -- 2. Significant linear positive relationship between speed of filleting and systolic blood pressure of the operator. -- 3. Significant linear positive relationship between speed of filleting and product of mean heart rate and systolic blood pressure of the operator. -- 4. Significant linear negative relationship between speed of filleting and percentage yield produced. -- 5. Significant linear positive relationship between speed of filleting and actual output rate (round fish as well as fillets) produced.  -- 6. Significant linear positive relationship between actual output rate (round fish as well as fillets) and mean heart rate of filleting operator. -- 7. Significant linear positive relationship between size of round fish filleted and actual output rate (round fish as well as fillets) produced. -- 8. Significant linear positive relationship between size of round fish filleted and mean heart rate of the operator. -- 9. Significant curvilinear positive relationship between size of round fish filleted and normal output rate (round fish as well as fillets) produced. -- Management in fish plants could use the relationships between work performance (actual output rate, etc.) and physiological parameters (mean heart rate, etc.) to design a better method of filleting, working height and work layout etc., and therefore improve the efficiency of the plant, without causing unnecessary higher physiological loads on the operator. -- This study also suggests that management in fish plants should set work standards by establishing relationships between size of fish and normal output rate for a range of different species of fish, input quality of fish, offshore-inshore fish, and dressed-undressed condition of the fish.


identifier: Song, Shaowen <https://research.library.mun.ca/view/creator_az/Song=3AShaowen=3A=3A.html>   (1988) A model for the two dimensional interaction between non-linear waves and uniform currents.  Masters thesis, Memorial University of Newfoundland.

abstract: The interaction of water wave trains with a uniform current normal to the wave crests  is considered. The combined wave-current motion resulting from the interaction is assumed stable and irrotational. The velocity potential, dispersion relation, the particle kinematics and pressure distribution upto the third order are developed. The conservation of mean mass, momentum and energy of the current-free wave, wave-free current and combined wave-current fields before and after the interaction are used, together with the dispersion relation on the free surface to derive a set of four nonlinear equations, through which the relationship between H, L, d, U and H₀, L₀, d₀, U₀ is established, where H₀, L₀, d₀ are respectively the current-free wave height, wave length, mean water depth, and U₀ the wave-free current speed, H, L, d, U are respectively the wave height, wave length, water depth, current speed of the combined wave-current field after the interaction. This is a new approach to an old problem. A numerical method is used to solve the system of nonlinear equations to calculate H, L, d, and U when given the values of H₀, L₀, d₀ and U₀. Numerical results for the changes of wave height, length, water depth, and current speed in the form of H/H₀, L/L₀, Δd/d₀, and ΔU/U₀ are presented, where Δd = d - d₀, ΔU = U - U₀. the prediction of the combined wave-current properties through H₀, L₀, d₀ and U₀ is established by using the velocity potential of the combined wave-current field and the numerical results of H, L, d, and U. A comparison between the experimental results of Thomas (1981) and the results of the present theory is presented, and surprising agreement is observed. -- Discussions on the radiation stress and energy transfer in the combined wave-current field, and on the numerical method and precision control are given in the appendices.


identifier: Mangalaramanan, Sathya Prasad <https://research.library.mun.ca/view/creator_az/Mangalaramanan=3ASathya_Prasad=3A=3A.html>   (1997) Robust limit loads using elastic modulus adjustment techniques.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Simple and systematic methods for determining lower and upper bound limit loads, based on two linear elastic finite element analyses, are presented in this thesis. The methods that are developed for estimating lower bound limit loads are designated as the mα-method and the r-node (redistribution node) method. It is also shown that robust upper bound limit loads can be obtained from statically admissible stress distributions that satisfy the integral mean of the yield.  -- The mα-method is based on the extended variational theorem of Mura et al., and utilizes the concept of leap-frogging to a near limit state and the notion of reference volume. The lower bound multiplier, mα is found to give limit load estimates that are better than the classical. -- The r-node method invokes the concept of redistribution nodes, reference stress and the primary stress as defined in the ASME Pressure Vessels and Piping code. R-Nodes are load-controlled locations in a mechanical component or a structure. As such r-nodes lie on a distribution of stresses corresponding to primary stress as defined in the ASME code. On account of its load-controlled nature, the "combined r-node equivalent stress" can a be identified with the reference stress, which is widely used in the integrity assessment of components and structures. -- The r-node method is also extended for analyzing two-layered beams and two-layered cylindrical shell structures. The proposed methods are applied to a number of pressure component configurations of practical interest. The results in all the cases are compared with those obtained using inelastic finite element analysis and the comparison is found to be good. -- The concept of iso r-node stress is introduced in order to minimize the weight of mechanical components and structures. A relationship is established among the proposed minimum-weight method, the theorem of nesting surfaces and the extended variational theorem. The proposed method is applied for minimizing the weight of an indeterminate beam and for designing reinforcement in a spherical pressure vessel with a cylindrical nozzle.


identifier: Soulis, Eric David <https://research.library.mun.ca/view/creator_az/Soulis=3AEric_David=3A=3A.html>   (1976) Modelling of iceberg drift using wind and current measurements at a fixed station.  Masters thesis, Memorial University of Newfoundland.

abstract: During the summer of 1972 a major oceanographic investigation was conducted in the Labrador Sea by the Faculty of Engineering and Applied Science of Memorial University of Newfoundland. Wind velocity measurements taken at sea and on shore, current velocity measurements from a fixed array of current meters, and iceberg trajectory measurements recorded from shore-based radar are analysed. A statistical study shows that an iceberg's movement can be modelled within 20% from wind and current measurements. The average response of icebergs to wind and transitory current effects is presented.


identifier: Murray, John James <https://research.library.mun.ca/view/creator_az/Murray=3AJohn_James=3A=3A.html>   (1981) Motion analysis and model study of a guyed tower structure in regular waves.  Masters thesis, Memorial University of Newfoundland.

abstract: The use of fixed platforms of either the gravity of jacket type in water depths exceeding three hundred and fifty meters would so escalate the size of these conventional platforms as to render recovery of oil uneconomical. Alternative platform concepts such as the guyed tower (Finn, 1976) take advantage of the effect of compliance to the wave action. However, such a concept introduces the main problem for deep-water platforms namely the dynamic interaction of waves and structure. Assuming the tower to be of uniform flexuaral rigidity and uniform weight per unit length, a modified Morison’s equation was used to determine the horizontal wave loads on the tower. The equation of motion for the horizontal displacement of the deck was set up and a Crank-Nicholson finite-difference algorithm was employed to solve the equation of motion of the tower. Water particle velocity and acceleration used in the wave loading computation were obtained using linear diffraction theory (MacCamy and Fuchs, 1954). In the development of the computer model the tower was represented as an equivalent be3am and the distributed wave load was resolved into concentrated nodal forces. Experimentally determined coefficients for damping, restoring and the mass of the tower were used for solving equation of motion. – In order to compare the predictions of the computer model with the performance of a physical model, a model of the guyed tower was constructed and tested in a wave tank. The tower was supported by eight guy wires each having a model weight per unit length of 5.21 N/m. Deck displacements of the tower were monitored by means of rotary transducers and the guy line tensions were monitored using ring transducers placed directly in the lines. The damping coefficient of the model was determined experimentally by displacing the model and using the logarithmic decrement obtained from a record of its free oscillation. The restoring coefficient was also determined experimentally by generating a plot of total restoring force versus deck offset of the model tower. Fairly good agreement between the computer model results and the physical model test results was found for the deck displacement.


identifier: Lau, Michael Wai-Hung <https://research.library.mun.ca/view/creator_az/Lau=3AMichael_Wai-Hung=3A=3A.html>   (1989) Ice forces on downward breaking cones.  Masters thesis, Memorial University of Newfoundland.

title: Ice forces on downward breaking cones

abstract: Structures located in ice-covered waters may use a conical form at the waterline to deflect wind and current driven ice. As the ice fails and displaces around the cone, the structure, together with its anchors and foundations, is subjected to multi-directional loads, and to moments which depend on the effective point of application of the ice load. This thesis reports the results of a series of model tests on downward breaking cones in level ice. The tests were carried out in the 96 m ice tank at the Institute for Marine Dynamics, in EGAD model ice. Displacements, bidirectional loads, and moments were measured in level ice for twenty-nine sets of different experimental conditions yielding a total of 142 data points. The value of this test series arises from the range of parameters which were examined. Ice thickness, flexural strength, cone angle, waterline diameter, ice-cone friction coefficient, advancing speed, and model set-up were systematically varied and their effects examined. In addition, tests with level ice were repeated with pre-sawn ice. Qualitative information about ice motion around the structure was also collected. The results are compared with available analytical predictions and model scale measurements from the literature.


identifier: Stoneman, William John <https://research.library.mun.ca/view/creator_az/Stoneman=3AWilliam_John=3A=3A.html>   (1987) Investigation of remotely operated underwater vehicle motion and computer simulation.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this thesis is to present a computer program that simulates the motion characteristics of a Remotely Operated Underwater Vehicle (ROV). In developing this program considerable detail has been given to the basic principles and properties that are related to ROV motion. This paper is intended to give a comprehensive development of the ROV characteristics this providing an overall view of the influencing factors involved with the ROB and its environment. -- The development of the computer program is presented by first investigating the mathematics of solid body motion and hydrodynamic influences, and then combining these concepts to mathematically express the motion of a general ROV. These mathematical expressions are then adapted for the specific ROV unite “HydroProducts RCV-225’ and used as the basis of a computer simulation of the vehicle motion. -- The computer program is presented as a fortran program capable of running on an IBM personal computer of compatible equipment. The final portion of the thesis illustrates several case studies of potential maneuvering procedures for the ROV.


identifier: Goteti, Raju <https://research.library.mun.ca/view/creator_az/Goteti=3ARaju=3A=3A.html>   (1988) An exploratory investigation of a free fall submersible escape capsule for an offshore oil rig.  Masters thesis, Memorial University of Newfoundland.

abstract: The Ocean Ranger and other oil rig disasters have shown that rig evacuation systems often do not work properly during severe storms. Most make use of cables to lower the survival craft to the ocean surface. In stormy weather, a pendulum-like motion of the craft can develop causing it to crash into the rig structure. Even when a craft reaches the ocean surface intact, thigh winds and waves can drive it against rig structures near the waterline. A fee fall submersible capsule system is proposed in this thesis which could avoid these problems. Upon release from the rig, the capsule would fall freely to the ocean surface. It would then sink into the ocean down to a level where water motion is insignificant. -- Obviously, there are many factors that would have to be considered for a complete investigation of such a system. Some of these are: the release mechanism, the free fall in gale force winds, the impact of the capsule onto the ocean surface, the post impact trajectory beneath the surface, the capsule recovery and the life support systems. This thesis examines only the impact and control aspects of the evacuation. Experimental data are presented which show that the decelerations experienced by a capsule when it impacts the ocean surface are well within human tolerance limits. Also, experimental data are presented which show that at model scale submergence depth of a capsule can be adequately controlled. This is in spite of the fact that the model constructed had severe hardware limitations. Obviously, with better hardware, much better control should be possible. The describing function concept of classical control theory explained much of what was seen in the depth control experiments.


identifier: Jain, Jinesh <https://research.library.mun.ca/view/creator_az/Jain=3AJinesh=3A=3A.html>   (1988) Computer-aided kinematic and dynamic analyses of flexible spatial manipulators of arbitrary architecture.  Masters thesis, Memorial University of Newfoundland.

abstract: The research work involves the kinematic and dynamic analyses of flexible manipulators  of (a) known architecture, (b) arbitrary architecture, and (c) redundant manipulators. The analyses also include the solution of constrained problems. In order to increase the computational efficiencies various efficient numerical schemes have also been studied for solving the dynamic problems. -- The constrained displacement analysis of these manipulator has been carried out by successive linear approximation principle where linear and non linear constraints can be handled. The constrained velocity and acceleration analyses have been carried out using quadratic programming principle and simplex method. -- In the dynamic analysis, the equations of motion have been obtained using the finite element method. The global system matrices are function of end-effector position and the force vector is a function of kinematic parameters. The dynamic equations are solved using  four efficient numerical techniques. The methods of solving the constrained dynamic equations are the Karmarkar's algorithm and the simplex method. To reduce the size of the system matrices, the Guyan reduction technique and component  mode synthesis have been used.


identifier: Esmail, Ali-Reza <https://research.library.mun.ca/view/creator_az/Esmail=3AAli-Reza=3A=3A.html>   (1988) Analysis and design of Delta PWM static AC to DC converters.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis, the modelling, analysis and implementation of the delta modulation technique as used in controlled ac-to-dc converters are presented. The proposed modulation scheme, fundamentally differs from conventional PWM techniques, by virtue of its self-carrier generating ability. This intrinsic feature provides the added advantages of ease of implementation, continuous converter voltage control and more importantly, a direct control on the line harmonic contents. -- An analytical model is developed, which provides key information on the maximum converter switching frequency, location of dominant harmonics and the PWM switching instances. Optimization of the delta modulator parameters is also carried out by means of parametric variations on a single-phase converter. -- The  delta PWM technique is implemented in both a single-phase and three-phase transistor bridge converter. In each case, theoretical harmonic analysis of the converter waveforms are  presented based on the discrete Fourier transform approach. The pertinent converter waveforms are described in terms of generalized switching functions and the harmonic components are evaluated using an FFT algorithm. Attention has been given to the design of the power and logic circuity conforming to the delta modulator switching specifications. Theoretical results are substantiated by experimental results conducted on prototype single-phase and three-phase transistor converters. -- Performance of the three-phase delta modulated converter with typical R-L and dynamic motor  loads are also considered. The results indicate the enhanced performance of the delta modulated converter yielding improved power-factor, near sinusoidal line currents and minimum filtering requirements.


identifier: Sankar, Vijay <https://research.library.mun.ca/view/creator_az/Sankar=3AVijay=3A=3A.html>   (1986) INLAPS : an integrated layout planning system : some algorithms for the FLP using quadratic programming and statistical analysis.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis is concerned with the solution of a Facilities Layout Problem using mathematical programming techniques, heuristics, applied statistics, and specialized algorithms peculiar to operations research and computer science. The core of an expert system has been developed that can generate sub-optimal solutions for the FLP using a micro or mini-computer. A knowledge base consisting of a construction  algorithm, an improvement algorithm, a minimax algorithm, equipment selection and material handling optimization algorithms, simple and multiple line balancing algorithms etc., has been developed. Heuristic rules have been used for  development of all the above mentioned algorithms except the minimax and material handling optimization routines. The Minimax algorithm was based on the solution of a generalized  Steiner-Weber problem and the material handling optimization  was achieved using a generalized n-dimensional knapsack problem model. -- A decision support system that quantifies the parameters of a production layout and decides whether a layout has to be changed at a given time period has been developed using the principles of statistical quality control theory and decision analysis. The algorithm utilizes  data from the other programs mentioned above and for a given  time span of operations and the relevant costs, gives the alternatives to the decision maker or calculates whether the  layout change is a profitable one. This can be considered to be the inference engine of the expert system. A set of utilities that calculate the various parameters have also been developed. They include a stepwise and multiple regression algorithm, time series analysis, linear programming using simplex method and a random access data base. -- The whole system has been developed to be tightly integrated in the sense that data from the output of one algorithm can be used in the rest. For this purpose, INLAPS (Integrated Layout Planning System) has a modular structure with six shells, namely LAYOUT, MATERIAL, BALANCE, DECISION,  UTILITIES and HELP for facilities layout, material handling optimization, line balancing, the decision support system, various utilities and help, respectively. Each of these shells have various modules that carry out their respective functions. All the programs are menu-driven with a detailed help facility.


identifier: Mansour, Sabah Yacoub <https://research.library.mun.ca/view/creator_az/Mansour=3ASabah_Yacoub=3A=3A.html>   (1979) Parameter estimation and optimization for active and active-reactive dispatch in electric power systems.  Masters thesis, Memorial University of Newfoundland.

abstract: This work is concerned with the optimal economic control of electric power systems.  An attempt is made to allocate optimally the active and /or active-reactive power generations while minimizing the fuel cost.  A problem of this nature is dealt with by representing the electric power system by an appropriate mathematical model to which a suitable optimization procedure is applied. -- For the purpose of optimal control for economy operation, it is convenient to think of the integrated electric system as being made of three major subsystems, viz, the thermal generation, the hydro generation and the interconnecting extra high voltage transmission network.  To each of these a suitable mathematical model is assigned. -- Our emphasis here is twofold; Firstly we wish to find estimates for the parameters appearing in each of the chosen models while bearing in mind that economy operation strategies require accurate parameter estimates.  For this purpose five well known parameter estimation algorithms are applied to the power system problem and results of their application compared in this thesis.  The second aspect of this work is concerned with the problem of optimally allocating the active and/ or active-reactive power generations of the dispatching system, making use of the models with their estimated coefficients. -- The optimization procedure is intended as an extra measure for judging the merit of each of the estimation techniques as applied to our power system problem, as it is clear that different parameter estimates give rise to different optimal strategies.  The allocated optimum power generations are then utilized into the original network and the network performance is analyzed.  Finally the optimization procedure is extended to include a range of loading patterns of the system.


identifier: Subbiah, Mahalingam <https://research.library.mun.ca/view/creator_az/Subbiah=3AMahalingam=3A=3A.html>   (1986) The computer-aided structural design of robotic manipulators.  Masters thesis, Memorial University of Newfoundland.

abstract: The research carried out in this work involves the kinematic and dynamic analyses of the robotic manipulators.  The kinematic analysis includes the displacement analysis of the planar and spatial mechanisms as well as the velocity and acceleration analyses.  In the dynamic analysis, the variation of the natural frequencies and the dynamic condensation techniques have been studied. -- The displacement analysis of the open and closed-loop systems have been carried out using the optimization principles and the modified Newton-Raphson technique.  The velocity and acceleration analyses have been divided into two categories:  in the first one, the number of unknowns are either greater or less than three and in the second one they are equal to three.  The first type is solved using the modified Newton-Raphson technique whereas the second type solved by simultaneous solution of the equations. -- To carry out the dynamic analysis, the equations of motion have been obtained using the finite element analysis.  The system matrices for the robotic manipulators are also dependent on the angular velocities and angular acceleration.  Several new methods of obtaining the matrix of direction cosines needed to represent the orientation of the local axes with respect to the global axes, are discussed.  The natural frequencies as a result of the variation of several design parameters have been obtained.  Finally, a comparative study on the two types of dynamic condensation schemes have been carried out using a machine tool spindle and a robotic manipulator as examples.


identifier: Srivastava, Ravi Swarup <https://research.library.mun.ca/view/creator_az/Srivastava=3ARavi_Swarup=3A=3A.html>   (1987) The contribution of multipathing effects in ground-wave radar return from the sea surface.  Masters thesis, Memorial University of Newfoundland.

abstract: The second-order ground wave spectral cross section of the ocean surface given by existing theories corresponds to the case where both theoretical scatterings occur within the bounds of a specific area or patch of the ocean surface.  Another additional term in the second-order cross section given by Walsh and Srivastava (1987), which represents the phenomenon where at least one scattering occurs outside the bounds of the patch of the ocean surface, is examined.  The properties and significance of this off-patch scatter (a multi-pathing effect) are discussed. -- The off-patch spectral cross section expression is simplified for a narrow beam receiving antenna.  By using suitable numerical techniques, a computer program is developed for calculating this cross section.  The program is applicable for wide beam transmitting antenna.  Theoretical Doppler spectra are generated for different radar frequencies and sea states to study the importance of this type of scatter.  A comparison is carried out between the Doppler spectra of the above two kinds of scatter for various sea conditions to infer the effect of off-patch scatter in extraction of ocean surface parameters.  Two possible cases, first when the radar is located on the open ocean and second when it is located on the beach, are considered for the comparison. -- It is determined that off-patch scatter is not significant in Doppler regions near the first-order peaks, which are commonly used to extract the ocean surface parameters.  However, at some Doppler frequencies its contribution may be important as contending ocean clutter in target detection problems.


identifier: Pilgrim, Robert Walter <https://research.library.mun.ca/view/creator_az/Pilgrim=3ARobert_Walter=3A=3A.html>   (1981) Modelling intercity bus passenger travel demand in Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this study was to develop a passenger forecasting model for intercity bus travel demand in Newfoundland. This involved the use of routinely published census data and mathematical techniques to predict and analyse passenger flow volumes. -- Modelling was performed at the trip generation and trip distribution stages of transportation planning. Trip generation was achieved using a library computer program for multiple linear regression analysis. During this stage, the most appropriate traffic zone size was assessed. Results were that an aggregation of census areas was proven more effective than single communities in relating passenger and demographic data. Trip  distribution was carried out by applying the gravity model. A computer program, which included testing of the gravity model output, was developed and written by the author for this research. A statistical criterion called the chi-square-test was successfully applied in analyzing output of the gravity model. This test indicated the closeness between  gravity model and observed passenger data and was judged superior to the visual method of determining when the gravity model is considered calibrated. The chi-square statistics were also applied in analysis of test year data. -- Testing of the model was achieved through comparison of predicted passenger data with data collected by actual counts during survey periods of four consecutive years following the base year. The model predicted a linear increase in ridership over the test years, whereas the actual data showed that fluctuations were present. Factors relating to dynamic change in the mode, which were included in the model, were accountable for deviations between predicted and observed data.


identifier: El-Tahan, Mona Salah Shahwan <https://research.library.mun.ca/view/creator_az/El-Tahan=3AMona_Salah_Shahwan=3A=3A.html>   (1980) Modelling of iceberg drift.  Masters thesis, Memorial University of Newfoundland.

title: Modelling of iceberg drift

abstract: The need for a numerical model to predict iceberg drift arises primarily due to the hazards that icebergs present to the drilling vessels and platform in the offshore areas near Newfoundland and Labrador. -- A dynamic model has been developed and used to study the behaviour of icebergs under different wind and current conditions. -- The forces considered are due to wind, current, Coriolis effects, pressure gradients (ocean surface slope) and the acceleration of water body surrounding the iceberg.  Two different techniques were used to solve the coupled non-linear differential equations of motions:  i) analog computer simulation and ii) digital computer using 4th-order Runga-Kutta method. -- The validity of this model is verified by comparing the predicted and observed iceberg trajectory during a storm on August 21-22, 1972 when an oceanographic study, conducted by the Faculty of Engineering and Applied Science of Memorial University of Newfoundland, was in progress near Saglek, Labrador to monitor iceberg positions with the help of radar.  The detailed wind and current data measured in-situ near the icebergs, provided a unique opportunity to verify the model and to study the effect of each of the environmental forces.  Several trajectories are obtained after excluding each one of the environmental forces used in the model in order to appreciate its effect on the drift of icebergs. -- In an attempt to obtain better understanding of the observed looping and spiral motions of icebergs, several trajectories are plotted for iceberg drifting under the environmental conditions thought to be responsible for this strange behaviour.  Changes in the ocean surface due to low pressure systems were found, using finite element analysis to have no effect on the currents, and hence on the iceberg trajectory. -- This study has demonstrated the importance of each of the environmental forces included in the model.  A good prediction of an iceberg drift trajectory is only possible if all the environmental forces are accounted for and detailed wind and current data in the immediate vicinity of the iceberg as well as good estimates of iceberg parameters are available as input to the model.


identifier: MacIsaac, Robert Richard <https://research.library.mun.ca/view/creator_az/MacIsaac=3ARobert_Richard=3A=3A.html>   (1978) Identification of ocean bottom sediments through measurements of coherence of acoustic echoes.  Masters thesis, Memorial University of Newfoundland.

abstract: With the increased interest in the exploitation of offshore resources, it is evident that a need exists for a rapid, reliable and automatic method of determing the composition and properties of the ocean floor.  Such information aids in the design and siting of off-shore structures and pipelines, provides an inventory of the mineral resources for economic development and planning and improves our understanding of the geophysical structure of the sea bed. -- In order to perform this work, data is required from a reliable, depth invariant echo sounder.  In a joint cruise with the Bedford Institute of Oceanography (BIO) 500 km of echoes have been collected over varying sediment types using the Huntec broadband (10 khz) Deep Tow System. -- In order to study methods of sediment classification, an approach based on filter theory is adopted and combined with an application of pattern recognition techniques.  Using the data base obtained on the BIO cruise, results are presented on the quantatitive measurement of the coherent (reflected) energy versus total received energy in acoustic echoes from the seabed for four sediment types.  Two metrics of the coherence of the received signals are developed.  The first is a measure of the normalized cross-correlation coefficient between adjacent acoustic samples.  When evaluated along the ship's track, 77% correct sediment classification is obtained with this procedure.  The second is an estimate of the relative amount of coherent energy in the acoustic return from the water-sediment interface when compared to the total   energy received.  A correct classification of 56% results from the use of this method. -- When both metrics are combined in a two dimensional vector plane, complete isolation of regions in the plane is observed.  These regions are identified for the acoustic data available, 100% correct sediment classification in the plane for the four sediment types is obtained.


identifier: Srivastava, Rajiv Kumar <https://research.library.mun.ca/view/creator_az/Srivastava=3ARajiv_Kumar=3A=3A.html>   (1988) Software controlled delta PWM inverters.  Masters thesis, Memorial University of Newfoundland.

title: Software controlled delta PWM inverters

abstract: The family of delta modulators can be characterized as uniformly sampled zero hysteresis, bang-bang type of controllers. Such systems are widely used in communication and instrumentation applications for encoding band-limited analog signals into binary waveforms i.e. A/D conversion. The inherent V/f ratio control and low order harmonic attenuation of modulated output are some of the attractive features of delta modulation which can be employed in voltage control of inverters and rectifiers. -- Delta modulated voltage source inverters, implemented by analog means, have shown improved performance over conventional PWM  inverters. However, software controlled delta modulated inverters require less complex control circuitry and offer easier control of system parameters. This thesis is the study of the performance of voltage source inverters using different types of delta modulation strategies. Continuous time variables of delta modulators transformed into discrete  time domain are able to generate switching waveforms to control a single phase voltage source inverter. Three types of delta modulation strategics are investigated. The results  obtained from their implementation are compared and a suitable choice of a modulation strategy for on-line inverter operation is investigated. -- The effect of filter coefficients, input signal amplitude, sampling rate, and tracking step (∆) on the modulator performance is presented.  In order to study the harmonic behaviour of the inverter output, a Fourier analysis is carried out. The predicted performance results confirm the advantageous features of the  delta modulation techniques. -- For experimental verification, a single phase bridge inverter and associate base drive circuits are built. Microprocessor-generated switching signals are applied to control the operation of the inverter. The inverter is tested with passive as well as  dynamic loads and a comparison between various modulation techniques is presented. Implications for further research are discussed.


identifier: Nancarrow, Richard Douglas <https://research.library.mun.ca/view/creator_az/Nancarrow=3ARichard_Douglas=3A=3A.html>   (1988) Soil structure interaction under the influence of wave loading.  Masters thesis, Memorial University of Newfoundland.

abstract: An experimental program was carried out to examine the influence of the presence of an offshore structure on the pore pressures in a soil bed under the influence of wave loading.  A bed of silt 0.4 m deep was placed in a wave tank and subjected to waves ranging in frequency from 0.6 to 1.2 Hz. generated by a flap type wavemaker.  Pore pressures in the soil bed and wave heights were measured and recorded.  Then a model of a gravity based offshore oil exploration platform was placed on a sand berm over the soil bed and subjected to waves at the same frequencies as without the model.  The bottom pressure wave data was compared to those predicted by linear wave theory and pore pressure in the soil bed for the case without the model in place were compared with those predicted by the Putnam-Liu solution.  Also, pore pressures with and without the model in place were compared.  It was found linear wave theory accurately predicts the magnitude of the bottom pressure wave, while measured pore pressures varied considerably from those predicted by the Putnam-Liu solution, depending on frequency.  It was found that the pore pressures were lower in both sand and silt when the model was in the tank for similar wave heights and frequencies and that pore pressures built-up rapidly in the sand berm with wave loading.


identifier: Sheha, Sayed Abo Elfetoh <https://research.library.mun.ca/view/creator_az/Sheha=3ASayed_Abo_Elfetoh=3A=3A.html>   (1975) Static and dynamic finite element analysis of underground cavities with some reference to nuclear reactor containments.  Masters thesis, Memorial University of Newfoundland.

abstract: The finite element method is used to study the static and dynamic behavior of underground cavities in rock.  The static loads are those resulting from the assumed free field initial stress state (in-situ state of stress) along with the deadweight of the rock.  The dynamic loading is a constant step pulse resulting from a blast excitation.  Temperature gradients that can follow an unexpected accident are also taken into consideration.  In the range of loads applied, the rock is considered homogeneous, isotropic and linearly elastic.  Cracks due to high tensile stresses are not allowed and rock sliding or joints are assumed not to exist.  The effects of different types of liners such as reinforced concrete, prestressed concrete, steel plate liners, as well as active and passive rock bolting, on the stress patterns in the rock media and the liner are investigated. -- An available computer programme is modified to take into account all the variables needed for the analysis including different configuration shapes.  The modified programme can deal with initial stress or initial strain states which facilitates the simulation of in-situ stress or expansions due to temperature.  The initial stresses, when specified in the bar elements, allow representation of prestress in the cases of the prestressed liner and active rock bolting.  As the original programme dealt with dynamic loading only, the modifications include adaptation to static loading. -- For preliminary design, the dynamic loading can be reasonably substituted by stepping up the static loading defined by the peak value by a dynamic load factor ranging between 1.15 and 1.25.  However, a finite element time history analysis should be carried out for the final design.  A safety factor is required to take into account thermal stresses depending on the probability of occurrence of temperature rise inside the cavity. -- Active rock bolting is found to be better than other kinds of reinforcement.  Results obtained from the prestressed concrete liner are not reasonable indicating the need for further studies for modifying the tendon profile and other parameters.


identifier: Abdel-Gawad, Sameh <https://research.library.mun.ca/view/creator_az/Abdel-Gawad=3ASameh=3A=3A.html>   (1979) Static penetration resistance of soils.  Masters thesis, Memorial University of Newfoundland.

title: Static penetration resistance of soils

abstract: In-situ tests play an important role in geotechnical investigations, particularly in situations where the problems of sample recovery and the consequent sample disturbance are severe limitations. -- This thesis is part of an ongoing research on penetrometers at Memorial University of Newfoundland.  The results reported here are for two cone penetrometers, 35.6 mm and 76.2 mm diameter, which were used in a static mode. -- Different theoretical and experimental results are available in the literature to define the failure mechanism associated with the penetration resistance of cones into soils. -- Strength parameters and penetrometer interaction properties of fine sand and silty clay were determined using the conventional triaxial and direct shear tests.  The results were then used as the basis for theoretical prediction of the penetration resistance after explicitly accounting for penetrometer base apex angle, penetrometer size and roughness.  Comparison of unit penetration resistance values measured in controlled laboratory tests and predicted by theory subsequently permitted the suggestion of the most appropriate method for the penetration mechanism. -- Methods for evaluating in-situ shear strength of soils from measured cone penetration resistance are suggested.  Values of shear strength parameters (C and o) are determined and compared with those of other investigators.


identifier: Deb, Manas Kumar <https://research.library.mun.ca/view/creator_az/Deb=3AManas_Kumar=3A=3A.html>   (1986) Statics and dynamics of a tension leg platform in intact and tether damage conditions.  Masters thesis, Memorial University of Newfoundland.

abstract: The aim of the present investigation is to study the static and dynamic behaviour of a tension leg platform in the intact condition and after partial or total loss of tether at any corner.  The exercise involves formulating the statics and dynamics of column stabilised structures with taut moorings and implementing the same in appropriate computer softwares.  Formulations are also made to calculate the equilibrium tensions after a loss of tether. -- The computer program for hydrostatics is capable of generating the standard hydrostatic information as well as locating the equilibrium configuration of the floating body under a given set of external static loads.  This is used to assess the statical stability of the tension leg platform in damaged cases and compare the same with its various other configurations. -- Under the category of hydrodynamic analysis, two major types of approaches, namely 'frequency domain’ and 'time domain' are employed.  In the frequency domain approach, wave amplitudes and all displacements are assumed to be small.  Also, integration of the hydrodynamic forces is carried out over the mean wetted surface of the body.  The wave excitation forces are calculated via a 'Morison type' formula and an iterative scheme is adopted to handle the nonlinear drag term.  This analysis is used to compute the 'response amplitude operators' (RAOs) in intact and damaged conditions.  Significant responses are also computed using these RAOs and Pierson-Moskowitz wave spectra for chosen wind speeds.  In the time domain analysis, though assumptions similar to frequency domain analysis are made regarding the incident wave.  However, no restriction is put on the motion of the body.  The excitation and the reactive forces are calculated over the instantaneous wetted surface and at the displaced position.  Nonlinear equations of motion are integrated using Adam's method.  This analysis is used to obtain time-series data of motion and tension responses in order to study the variation of steady state amplitudes in intact and damaged conditions as well as transients following a loss of tether. -- A special study of the occurrence of Mathieu type dynamic instability in tension leg platforms is also undertaken.  A formulation to calculate unstable combinations of wave height and frequency is developed based on Floquet theory for periodic systems.  The effect of various pertinent parameters including loss of tether on instability is also investigated. -- Furthermore, a 1:100 scale model of a representative tension leg platform is designed and fabricated.  Experiments are conducted in regular and irregular waves in both intact and damaged configurations and the experimental observations are compared with those predicted by the theoretical models. -- It is seen that a complete loss of tether at any corner can reduce the statical stability of a tension leg platform drastically.  A loss of tether, in general, is found to increase the platform motions in vertical planes as well as the static and dynamic tensions in the remaining intact tethers.  Total loss of tether at one corner induces snap loads in one or more corners.  Depending on the wave height and frequency, these snap loads could be high enough to trigger further tether failures.  With regard to Mathieu type dynamic instability, even a 25% loss of total axial stiffness of the tethers is seen to have insignificant effect on the occurrence of such instability.


identifier: Kantarcioglu, Mustafa V. <https://research.library.mun.ca/view/creator_az/Kantarcioglu=3AMustafa_V=2E=3A=3A.html>   (1984) Simplified cost control technique for small and medium sized building contractors.  Masters thesis, Memorial University of Newfoundland.

abstract: During the last thirty years, smaller building contractors who do jobs up to five million dollars in value and who make up approximately ninety percent of the construction industry, have experienced increasing difficulties and failures in completing construction projects on time and within budget.  The factors responsible are generally identified as today's more complex projects and environmental protection demands inflation and financing difficulties, and multiplicity of union demands.  Since monitoring of these factors is complex, it is difficult to control them using traditional cost control methods. -- To understand these real life problems faced by smaller building contractors, the present construction industry practice has been studied both through interviews and survey of recent publications.  In spite of low profits, only a minority gives up the traditional practices in favour of modern techniques.  They are afraid that the transition will be costly, will require new expertise and will cause implementation difficulties.  Their reluctance is understandable, since most modern techniques are computer based and the available package programs are tailored to meet the needs of large organizations or are very specific, capable of meeting limited needs. -- This Project Report presents a Simplified Cost Control Technique (SCCT) which is easy and simple for adoption by these contractors and at the same time overcomes the drawbacks of traditional methods.  SCCT proposes the preparation of workbreakdown structure, rate table, bar charts and seven periodic cost reports to monitor and control the construction costs effectively.  This Project Report also presents a few other possible uses of SCCT, in addition to cost control.  To ensure the timely availability of these periodic reports, a method of computerizing this technique has also been outlined in this report.


identifier: Abdel-Rahim, Naser M. B. <https://research.library.mun.ca/view/creator_az/Abdel-Rahim=3ANaser_M=2E_B=2E=3A=3A.html>   (1989) Single phase delta modulated inverter for uninterruptible power supply applications.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis examines in detail the suitability of Rectangular Wave Delta Modulation (RWDM) for Uninterruptible Power Supply (UPS) applications. -- Various types of Delta Modulation schemes commonly used in communication systems are presented with a view to selecting the appropriate modulation scheme for UPS applications.  It is shown that RWDM posseses many attractive features which make it suitable for UPS applications:  simple control circuitry, ease of control of the frequency spectrum of the modulator output through the variation of modulator parameters. -- An analytical model of the rectangular wave delta modulator is developed to qualitatively describe the effect of various modulator parameters on the modulator performance.  A numerical approach based on Discrete Fourier Transform and harmonic analysis technique is proposed to quantitatively investigate the performance of the modulator. -- The effect of various modulator parameters on the single phase delta modulated UPS inverter with two commonly used load filters, namely L-C and tank circuit filter, is studied for various types of load.  It is shown that RWDM provides significant improved performance in single phase delta modulated UPS inverter.  It offers improved voltage utilization ratio, suppressed amplitudes of low order harmonics at the inverter output and hence a small filter size. -- Analytical expressions and computer simulation of voltages and currents in the load filter are provided.  The predicted results are substantiated by corresponding experimental results.