Engineering Commons^™

Behavior Of Composite Steel-Fibrous Concrete Beams, Avijit Mookerjee

Theses

This research thesis on composite steel-fibrous concrete is based on a series of beam tests conducted in the Structural and Concrete Laboratory of the New Jersey Institute of Technology.

In the first series of tests, two twenty-foot two-span continuous beams were tested. In the first beam, plain reinforced concrete was used in the construction of the composite beam. The second beam had 1.5% by volume of steel fibers in the concrete.

In the second series, four composite T-beams were tested. Two of the beams had 1% of steel fibers by volume. The other two beams were constructed using plain concrete. …

Organizing To Manage Future Information Technologies, John Patrick Paczkowski

Theses

The area of information technology has undergone dramatic changes over the past ten years, and the rate of change is expected to continue to accelerate through the 1980's and beyond. The newly developing information systems are providing organizations with numerous options for enhancing the quality of managerial decision making, speeding communications and improving the efficiency and effectiveness of administrative/office processes. Unfortnately, many organizations are discovering that they are unable to effectively assimilate and utilize the technology effectively. Chief executives are finding that the traditional structures for managing Data Processing, Telecommunications, and office systems are often fragmented, lack the technical expertise …

Nomographs And Tables For Simplified Thermal Analysis Of Power Piping, Dhanjibhai N. Patel

Theses

This Thesis develops Nomographs and Tables for simplified thermal analysis of " Power Piping." It gives the length of required Thermal Relieve Leg when a set of piping parameters such as, pipe size, pipe material, operating temperature and pipe length are given.

The Nomographs and Tables developed here can be used

1. to determine the primary piping layout, piping route, support location etc. before vigorous conputer analysis is performed.

2. to help the Field Engineer on the plant site to make " on the spot " decisions on pending piping route changes.

Two Nomographs are developed in this Thesis. One …

Criteria Measurement In Edp Auditing, Eugene Alexander Ottaviano

Theses

Criteria Measurement in EDP Auditing is a planning technique to assist the Internal Audit function in systematically selecting software applications for budgeted audit reviews. The objective is to develop a risk analysis method, which is not time and labor intensive, that will minimize risk to the corporation and maximize audit effectiveness. The methodology does not consider probabilities or occurrence rates because risks to the EDP environment are extremely difficult to forecast with traditional techniques. The method provides for both objective and subjective risk determinations.

The approach is to measure software risk criteria for a specific data processing environment. Risk concerns …

The Hydroxide-, Chymotrypsin-, And Blood-Catalyzed Hydrolysis Of A Series Of Sodium 4-Acyloxy-3-Nitrobenzene Sulfonates, Louis E. Rinaldi

Theses

The kinetics of the hydrolysis of a series of water-soluble aromatic esters (sodium 4-acyloxy-3-nitrobenzene sulfonates) were analyzed in order to determine the effect of a variety of substitutions (on the α-carbon of the acid group) upon the rate of reaction.

The following was observed. That (a), the hydroxide catalyzed and water dependent hydrolyses of these esters are slower for larger substituents and faster for smaller ones. That (b), the chymotrypsin catalytic hydrolysis of these esters shows an acylation reaction step which occurs at a rate greater than deacylation for larger substituents, and at approximately equal rates for smaller ones. Furthermore, …

Kinetics And Reactivity Of The 2,4-Tolyene Diiscoyanate With 2-Hydroxyethyl Methacrylate Reaction, Menq-Fong Shieh

Theses

The kinetics of the addition of 2-hydroxyethyl methacrylate(HEMA) to 2,4-Tolyene diisocyanate(2,4-TDI) were studied at the temperature of 25°C, 30°C and 38°C. Reactant and product concentrations were monitored by liquid chromatography.

The rate equations for the series-parallel second order reaction have been developed and integrated by the Runge Kutta-Gill method. The results show that the para

group is about 12 times more reactive than that of the corresponding ortho group with the HEMA hydroxyl group at 25°C, and small amount of HEMA diadduct invariably produced.

Liquid Transmission Line Pulser Circuit For Laser Excitation, Carl Stultz

Dissertations and Theses

The subject of this thesis is the study of liquid dielectric transmission lines and their potential application as an excitation source in high speed, high-repetition rate laser designs. The design problems associated with the construction of high repetition rate (khz), short wavelength lasers have been reviewed and the major shortcomings of conventional electrical driving circuits identified. The identification of these shortcomings and a review of the available literature on electrical circuits for various types of lasers suggested that liquid dielectrics and transmission lines could potentially have significant advantages over more conventional circuitry used in high repetition rate, short wavelength lasers. …

Nonpoint Source Pollution To Bear Lake, Utah-Idaho: Magnitude, Periodicity, And Watershed Management Alternatives, Victor J. Kollock

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

From April of 1981 to June of 1982 a Clean Lakes Program Phase 1 Diagnostic Feasibility Study was conducted on Bear Lake, a 282 km² (109m²) fresh-water lake located in southeastern Idaho and northeastern Utah. A portion of this Clean Lakes Program required an itemized inventory of all nonpoint sources affecting the lake's water quality.

A 16 month lake tributary monitoring program, which included the spring runoff periods of 1981 and 1982, provided data from which nutrient loading values (kg/day and kg/yr) were calculated. Analysis of these data, along with land use percentages within the Bear Lake …

A Master Clock For The Speed School Impulse Clock System Using Wwv Time Information, John E. Pfeifer Jr.

Electronic Theses and Dissertations

Since approximately February of 1979, the Speed School impulse clock system has not functioned due to a worn-out master clock that was never replaced because of a lack of fund. For this thesis project, a solid-state master clock that performs the same functions as the old mechanical master clock was built for less than $200. The new clock features accuracy traceable to the National Bureau of Standards, automatic reset after a power-down and subsequent power-up, and a daylight savings time provision. A decoder that recovers time information broadcast by radio station WWV from Fort Collins, Colorado was built and interfaced …

Evaluating The Design And Operation Of Irrigation Canals In Egypt, Amany El Kayal

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A computer simulation model for temperature data was developed in order to generate synthetic daily temperature. The model consists of two components: a deterministic component represented by a Fourier series fit, and a stochastic component represented by an autoregressive model. The simulation model was proven to be able to preserve the main statistics of the historical series.

The data generated by the above temperature model were used as an input to an irrigation water requirements simulation model. This model incorporates the probabilistic nature of these requirements. The irrigation system of Abo Raya area in Egypt was used to demonstrate the …

Broadband Base Isolated Asymetrically Fed Vhf Antenna, Peter Edward Cunningham

Dissertations

Antennas presently being used for vehicular military VHF communications are narrowband. New generation frequency hopping radios, however, require broadband antennas. The antenna must be base isolated in order to reduce undesirable pattern nulls and impedance variations caused by currents induced on the support structure. Physical constraints limit the antenna length to three meters while operating from a frequency of 30 MHz to 88 MHz.

To satisfy the above requirements a model of a broadband, base isolated, cylindrical antenna less than three meters long was analyzed and built. Equations for the current distribution as a function of the physical parameters were …

Convective Heat Transfer From A Cylinder Rotating In Air, O. Kemal Pasamehmetoglu

Retrospective Theses and Dissertations

This study had a two-fold purpose. The initial emphasis was placed upon the analysis of heat transfer to ambient air from a rotating cylinder. Three distinct heat transfer regimes can be identified. For low rotational speeds corresponding to a Reynolds number less than the critical value for initiation of turbulence, the flow is laminar and the rotation has no effect on the average heat transfer coefficient. In the transition region, the heat transfer coefficient depends upon both natural convection and rotational effects. For higher rotational velocities, the flow is fully turbulent and rotational effects dominate. Previous analytical and experimental studies …

The Development Of A Computer Aided Design Program For Constant Group Delay Monolithic Crystal Filters, Michael A. Robitaille

Retrospective Theses and Dissertations

A computer program, which realizes monolithic crystal filters with constant group delay, is developed. This program analyzes and synthesizes a class of transfer functions developed by J.D. Rhodes called equidistant linear phase transfer functions. Using cascade synthesis, the program calculates the values of the inductor and capacitors of the ladder sections which realizes these functions. The ladder sections are implemented using monolithic crystal filters.

An Evaluation Of The 8051 Microcontroller, George C. Schafner

Retrospective Theses and Dissertations

With the increasing availability and use of 16-bit microprocessors, the 16-bit data bus and is becoming more prevalent. However, many peripheral devices such as printers and tape/disk drives still require an 8-bit data bus for their interface. This paper will explain how an Intel 8051 microcontroller may be used to interface a 16-bit data bus to a peripheral requiring an 8-bit data bus. A FIFO is used to buffer data from a 16-bit processor so that efficient use of processing time is maintained. The 8051 is used to control the peripheral and data transfer.

Transient Two Dimensional Ground-Water Flow: A Comparison Of Computed And Analytical Results, Robert Jan Fennema

Civil & Environmental Engineering Theses & Dissertations

The exact analytical solution of the transient-flow equation is compared with the finite difference solution. The finite difference program, written by the author, uses an iterative alternating direction implicit procedure to solve the linearized partial differential equation. A second order accurate central difference method is employed to solve the equation in two dimensions.

Variable cell spacing to divide the physical domain, a weighting factor and a time acceleration function were used to investigate rate of convergence and accuracy of the numerical solution. The exact integral solution to the one-dimensional form of the flow equation i n radial coordinates is used …

Application Of The Method Of Lines For Solutions Of The Navier-Stokes Equations Using A Nonuniform Grid Distribution, Jamshid Samareh Abolhassani

Mechanical & Aerospace Engineering Theses & Dissertations

The feasibility of the method of lines is investigated for solutions of physical problems requiring nonuniform grid distributions. To attain this, it was also necessary to investigate the stiffness characteristics of the pertinent equations. For specific applications, the governing equations considered are those for viscous, incompressible, two-dimensional and axisymmetric flows. These equations are transform­ ed from the physical domain having a variable mesh to a computational domain with a uniform mesh. The two governing partial differential equations are the vorticity and stream function equations. The method of lines is used to solve the vorticity equation and the successive over relaxation …

Effect Of Transducer Size On The Statistical Properties Of A Simulated Turbulent Wall Pressure Field, Mehdi R. Khorrami

Mechanical & Aerospace Engineering Theses & Dissertations

The root mean square pressure was calculated with synthetically generated pressure signals for transducers of different size. The transducer diameters were in the range of 0.02 < _s*of 12,250. The lower limit of the diameter simulated here was much smaller than diameters reported previously by other workers. Calculated root mean square pressure levels developed in the present work were in good agreement with the measured experimental data.

In order to check the simulated pressure signals, the power spectrum and two point correlation were calculated as well. The power spectra obtained with the smaller transducers were higher in energy level at …

Viscous Modeling And Computation Of Leading-And Trailing-Edge Vortex Cores Of Delta Wings, Balakrishnan Lakshmanan

Mechanical & Aerospace Engineering Theses & Dissertations

A Finite-Difference method is presented for calculating steady quasi-axisymmetric flow of an incompressible fluid at large Reynolds number. Approximations of the boundary-layer type are employed to reduce the Navier-Stokes equations to a pair of non-linear parabolic equations. Along with the governing equations, initial conditions are specified at some upstream cross section and boundary conditions are specified at the axis of symmetry and on the outer bounding surface.

The governing equations are replaced by a set of quasilinear finite-difference equations. The solution is obtained by a marching technique, which proceeds step-by-step in the axial direction. At each axial station, an iterative …

Large Amplitude Free Flexural Vibrations Of Laminated Composite Plates Of Arbitrary Shape, Mo-How Shen

Mechanical & Aerospace Engineering Theses & Dissertations

A finite element formulation is presented for analyzing large amplitude free flexural vibrations of symmetrically laminated composite plates of arbitrary shape. Linear and nonlinear fundamental frequencies are determined from the analysis. The laminates are made of multiple generally or specially orthotropic layers and symmetrically disposed about the middle surface, hence there is no coupling between bending and extension. Linearized stiffness equations of motion governing large amplitude oscillations of laminates, linear element stiffness matrix, quasi-linear geometrical element stiffness matrix, and solution procedures are presented. The linearized geometrical stiffness matrix for a 18 degrees-of-freedom high precision triangular anisotropic plate element is evaluated …

Development Of A Computer-Aided Analysis Package For Linear Elastic Fracture Mechanics, William E. Warkentin

Theses and Dissertations

This thesis develops an interactive computer-aided analysis package for solving linear elastic fracture mechanics problems. CHILES 2 (an existing finite element fracture mechanics program) was modified to be interactive. The modified program is named CHILES.BYU and is used in conjunction with QMESH.BYU and MOVIE.BYU to form the total software package. An analysis of glass ceramics and glass ceramic/metal interfaces was performed demonstrating the capabilities of the package. This study demonstrates the usefulness of an interactive package of computer programs to allow an engineer to rapidly investigate different crack configurations.

Scrubs.Byu A Two Dimensional Finite Element Package For Continuum Analysis Using Quadratic Isoparametric Elements, Michael Glenn Long

Theses and Dissertations

This thesis develops a two dimensional, axisymmetric finite element package for solving continuum problems including rubbleization subsidence and nonlinear fracture mechanics. This package includes both a user friendly preprocessor, PRESCRUBS.BYU, and a versatile analysis code SCRUBS.BYU. PRESCRUBS.BYU systematically creates the data file necessary to run SCRUBS.BYU. SCRUBS.BYU provides many options of nonlinear static analysis using either linear or quadratic isoparametric finite elements. Sample problems are presented that demonstrate the capabilities of this package.

Evaluating The Effects Of Alum With Polyelectrolyte Coagulant Aids In Treatment Of Low Turbidity Waters, Kenneth John Stockwell

Civil & Environmental Engineering Theses & Dissertations

Potable water sources usually require treatment for removal of suspended organic and inorganic particles. Conventional treatment processes incorporate chemical coagulants for removal of these suspended particles. Alum is a widely used coagulant that can provide adequate removals of turbidity. However, high alum dosages are required for treatment of low turbidity waters producing a voluminous sludge that is difficult to dewater.

Recent Federal regulations have limited disposal options for chemical sludges. This has prompted a reevaluation of coagulants and their dosages with the goal of reducing the amount of sludge produced and improving the sludge handling characteristics necessary for ultimate disposal. …

On The Space Shuttle Wing Thermal-Structural Analysis, Kumar Krishna Tamma

Mechanical & Aerospace Engineering Theses & Dissertations

A finite element approach for efficient thermal-structural analysis of structures with thermal protection systems (TPS) is described. The approach is applied to Space Shuttle wing structure configurations subjected to reentry heating. New two and three-dimensional finite elements are developed to model heat transfer in the TPS and supporting structure. A typical TPS/Structural element predicts transient nonlinear temperature variations through the TPS thickness and detailed structural temperatures at the TPS/Structure interface. The accuracy of the TPS/Structure approach in two and three-dimensions is evaluated by comparisons with the conventional approach for various configurations of the wing structure. The results indicate that the …

Analytical And Experimental Stresses In Concrete Pavements And Unbonded Overlays, Ahmad Jaber

Dissertations and Theses

The principal objective of this study is to determine the accuracy of calculating stresses in concrete pavements and unbonded overlays under different loading conditions. The computed stresses for the single layer pavements are obtained based on Westergaard theory, the finite-element model (ILLI-SLAB), and the elastic layered model (ELSYM5). For the two-layer unbonded systems, stresses are estimated based on the finite-element theory and the Portland Cement Association design method. The experimental results for the comparison were available from a series of tests done on model scale concrete pavements and unbonded overlays. The results of present investigation show that the computed stresses …

Steady State Heat Transfer From Two Concentric Rings Of Spheres, Kevin J. Fitzpatrick

Theses

The method of reflections was used to solve the steady state heat transfer problem for two concentric rings of spheres, all at equal surface temperature. The method results in a mathematical model for the three dimensional temperature profiles around the array of spheres. This model is used to develop an expression for heat transfer rate from the array. This work has resulted in a solution for dilute systems since no ring to ring interaction term was found.

Moment Method Solution Of The Time-Dependent Transport Equation To Describe The Scattering Of Gaussian Plane Wave Pulses By A Forest, Nack Yang Cho

Theses

The time dependent transport equation is used to study the transmission of periodic pulses through a forest. The forest is assumed to occupy a half-space region, to be statistically homogeneous and to scatter energy isotropically A periodic sequence of Gaussian plane wave pulses is assumed to enter the forest normally from free space. The transport equation is solved by the moment method using triangular expansion functions. Numerical results indicate the dependence of the incoherent intensity on penetration depth, observation angle, albedo and pulse repetition rate.

On The Analysis And Design Of Clamped Rectangular Plate With Partial Load, Yacin Saaid Jaboury

Theses

In this Thesis, maximum deflection and bending moments of a partially loaded clamped rectangular plate are studied. The loading is uniformly applied to a retangular area proportional to the shape.

Navier's Solutions on partially loaded simply supported rectangular plate is superimposed with edge moments to give the clamped boundry condition.

Solutions of maximum deflection and bending moments are derived in Double Series form. A Fortran program is employed in obtaining the numerical results. When the partially loaded area approaches zero it becomes a centrally loaded case; and when loading area to plate area ratio approaches unity it becomes a uniformly …

Numerical Solution Of Navier-Stokes Equation By Finite Element Method, Kuan-Tzong Lee

Theses

A finite element method for solving the entrance flow in a parallel-plate channal at low Reynolds number has been studied. Two methods of formulation for both incompressible viscous and inviscid fluid flows were developed. The first uses stream function and potential function as field variables while the second uses velocity and pressure. Both formulations presented here ultilized variational principle and weighted residual method. The numerical example was solved by constrained variational principle with penalty functions in conjunction with the Newton-Raphson method. A 9-node quadratic quadrilateral element was used in this example. Numerical results for entrance flow problem were obtained for …

Behavior Of Reinforced Fibrous Beam-Column Joints Under Cyclic Loads, Sitaram Mahadev

Theses

From exploratory research of reinforced fibrous concrete, it has been shown that fibrous concrete is potentially superior and less costly than the conventional reinforced concrete.

The testing program consisted of ten beam-column joints with half of these joints containing 1-1/2 percent hooked end fibers. The beam column joints were constructed with less hoops than a conventional seismic joint would have, according to design specifications of the American Concrete Institute Code (ACI 318-77). In studying the behavior of these beam-column joints, two loading cases were examined:

(1) critical regions whose inelastic behavior was controlled by bending, and

(2) critical regions whose …

Computer Aided Analysis Of Electroencephalographic Waveforms, Edward Tadeusz Polkowski

Theses

An approach to analysis of EEG waveforms is described. The procedure utilizes a PDP -11 computer to perform a Fast Fourier Transform on four channels of data simultaneously. The transforms are done in real time and. the results are plotted in a manner which allows the operator to easily determine the major background activity and to check for left-right symmetries in brain waves. Patient data is used to verify the computer output against actual clinical diagnoses.