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H & V News Plus Hevac 80 Exhibition Preview

Building Services Engineering

No abstract provided.

Statistical Fading Of A Spherical Optical Wave In Atmospheric Turbulence, Lorraine M. Locke

Retrospective Theses and Dissertations

A formula for the average fade time of the intensity of a spherical optical wave travelling through atmospheric turbulence is developed. The model employed involves isotropic, homogeneous statistics using a lognormal distribution for the channel. The analysis is based on the fact that the logarithm of the irradiance is normally distributed and uses the work of S. O. Rice who developed such an expression for a zero mean, Gaussian process. The analysis employs the covariance function and the Taylor frozen turbulence hypothesis which results in an expression for the autocorrelation function.

Noise Description And Noise Control At The Federal, State, And Local Level, Bobby L. Henning

Retrospective Theses and Dissertations

Noise, that undesirable portion of the ever-present sounds of our environment, has until the last decade, been considered as an unavoidable by-product of our rapid population growth and its accompanying mechanization. As awareness of adverse health effects from noise exposure grew, the Federal government, as protector of the public health and welfare, took the initial steps to control noise pollution. Federal legislation, beginning with the Clean Air Amendments of 1970, has been promulgated to control major offenders and to assist State and local governments in their endeavors to provide the public with an environment free from harmful noise levels. This …

Speed Control Of Dc Shunt Motor For Electric Car Use, Mahmood Shahi

Retrospective Theses and Dissertations

This report describes the speed characteristic and various methods of speed control of DC shunt (separately excited) motors, especially for application in electrical vehicles. The basic behavior of the DC motor is discussed, along with traditional and modern techniques of speed control. As an example, a speed controller for a shunt motor (built and tested by the author) is discussed. Two types of speed controllers for electric cars are discussed, and the performance results for an experimental electric car are presented. Finally, a design for a 24 HP car motor controller using both armature and field control was simulated on …

A Dimensionality Reduction Algorithm For The Karhunen Loeve Transform, Salomi T. Charalambous

Computational Modeling & Simulation Engineering Theses & Dissertations

The Karhunen Loeve Transform has conclusively been shown to be the optimum data compression algorithm for signals belonging to the same second order stationary process. Consequently, researchers have been searching for a fast implementation for the transform. Fast imple­mentation methods similar to those developed for other orthogonal transforms are generally not applicable to the Karhunen Loeve Transform (KLT). Also, since the basis vectors composing the transformation matrix of the KLT are the eigenvectors of the covariance matrix of the input process, they must be computed first. The research re­ ported here is an attempt to reduce the dimensionality of the …

Relativistic Scattered Wave Calculations On Uf6, David A. Case, Cary Y. Yang

Electrical and Computer Engineering

Self‐consistent Dirac–Slater multiple scattering calculations are presented for UF₆. These are the first such calculations to be reported, and the results are compared critically to other relativistic calculations. The results of all molecular orbital calculations are in good qualitative agreement, as measured by energy levels, population analyses, and spin–orbit splittings. The overall charge distribution is computed to be U^+1.5(F^−0.25)₆. Polarization functions are found to be qualitatively unimportant. A detailed comparison is made to the relativistic Xα (RXα) method of Wood and Boring, which also uses multiple scattering theory, but incorporates relativistic effects …

Effect Of Interrupted Flow On Traffic Noise, Kenneth R. Agent, Charles V. Zegeer

Kentucky Transportation Center Research Report

The objectives of this study were to investigate the effect interrupted traffic flow has on traffic noise and to determine an applicable adjustment factor. No attempt was made to develop a specific equation to predict noise levels at interrupted flow locations.

The basic method of analysis consisted of comparing the field data taken at intersections to determine if the measured noise levels changed as a function of distance from the intersection. Results showed that interrupted flow conditions did not cause an increase in the L₁₀ and L_eq noise levels. Data taken before and after the installation of traffic …

Highway Research, James H. Havens

Kentucky Transportation Center Research Report

The Division of Research is responsible for:

1. Developing and carrying out a comprehensive research program on all aspects of transportation engineering and operations.
2. Maintaining lateral communication and coordination with other segments of the Department of Transportation regarding the development and conduct of research studies and special investigations of various operational and engineering problems.
3. Maintaining relations and cooperating with universities, professional organizations, and other transportation agencies; evaluating and reporting the research experiences of those agencies; and utilizing their findings directly or with further research for the benefit of the Kentucky Department of Transportation.
4. Maintaining an up-to-date library of research findings on …

Evaluation Of Impacts Associated With Reregulation Of Water Levels In Lake Mohave, Larry J. Paulson, John R. Baker, U.S. Water And Power Resources Service

Publications (WR)

The U.S. Water and Power Resources Service is considering reregulating Lake Mohave water levels to increase the net power benefit from Hoover Dam. Reregulation will not increase the generation capacity of the Hoover powerplant but it will enable the plant operation to be increased when the energy has greater monetary value. Energy generated at different times of the year has different market value, the highest being in January-March and July- September. By generating more power during these periods more net monetary benefit can be derived from Hoover Dam. The total volume of water released from Hoover Dam over an annual …

Optics At Texas Tech University: Learning By Doing, John F. Walkup, P. F. Williams, Martin A. Gundersen

P. F. (Paul Frazer) Williams Publications

In both the undergraduate and graduate educational programs of the Department of Electrical Engineering at Texas Tech University, students are strongly encouraged to learn by active participation. Both programs have benefited from a vigorous faculty involvement in a wide range of funded research projects in various areas of modern optics.

Department Of Computer Science, Nova University

College of Engineering and Computing Course Catalogs

No abstract provided.

A New Experiential Course In Engineering Management, Donald S. Remer

All HMC Faculty Publications and Research

Institutions with undergraduate programs of the engineering management type often find their introductory courses to be popular electives for students in more traditional engineering disciplines, while in other cases specific courses from business management or industrial engineering departments are elected. Where none of these options are available or suitable, engineering schools are well advised to provide one or two key courses to provide at least an introduction to the management problems their graduates will face. At Brown University, according to Prof. Barrett Hazeltine, a series of two courses in engineering management serve this function; more than half of Brown's undergraduate …

Ua35/11 Student Honors Bulletin, Wku Honors Program

WKU Administration Documents

Student research papers chosen by each college as best of the academic year.

• Bolte, William. Use of Government Documents in Small and Medium-Sized Libraries and Future Utilization Prospects
• Brevit, Valery. Development of the Concepts of Infinity
• Cook, Ken. KIM-1 Calculator Interface
• Irwin, Tom. Status Preservation in Three Characteristic Radical Right Groups
• Logan, Ben. Jungian Psychoanalysis of the Petrarchan Lover
• Moore, James Jr. Communication Problems and the Families of Schizophrenics
• Nash, Jeffrey. St. Luke as Historian
• Porto, Eugenia. In Defense of Camus
• Roberson, Philip. The Religious Thought of Rabindranath Tagore
• Wood, Irene. The Them of Incest in Dickens' Hard Times

Crystal And Molecular Structures Of Organophosphorus Insecticides. 13. S-Isopropyl 0-Methyl 0-(3,5,6-Trichloro-2-Pyridyl) Phosphoramidothioate And Dimethoate, Rick L. Lapp, Robert A. Jacobson

United States Department of Energy: Publications

The crystal and molecular structures of S-isopropyl O-methyl O-(3,5,6-trichloro-2-pyridyl) phosphoramidothioate, C₉H₁₂N₂O₂PSC1₃, and dimethoate [ O,O-dimethyl S-(N-methylcarbamoyl)methyl phosphorodithioate], C₅H_I2NO₃PS₂, have been determined by three-dimensional X-ray analysis. The former compound crystallizes in the triclinic space group P1 with a = 10.319 (5) Å, b = 10.730 (6) Å, c = 8.44 (4) Å, a = 99.01 (2)°, β = 114.02 (l)°, and y = 62.64 (1)° with Z = 2, and the latter compound crystallizes in the monoclinic space group P2_{1 …}

The General Purpose Interface Bus, Ernest D. Baker

Retrospective Theses and Dissertations

The General Purpose Interface Bus, as defined by the IEEE Standard, deals with systems that require digital data to be transferred between a group of instruments. An overview of this standard is presented which summarizes the interface's capabilities, functions and versatility by explaining the basic interface concepts. In addition, a GPIB testing application and a GPIB related design example are presented and investigated.

Statistical Fading Of A Plane Optical Wave In Atmospheric Turbulence, John F. O'Hara

Retrospective Theses and Dissertations

A formula for the average fade time of the intensity of a plane optical wave traveling through atmospheric turbulence is developed. The model employed involves isotropic, homogeneous statistics using a lognormal distribution for the channel. The analysis is based on the fact that the logarithm of the irradiance is normally distributed and uses the work of S. O. Rice who developed such an expression for a zero mean, Gaussian process. The analysis employs the covariance function and the Taylor frozen turbulence hypothesis which results in an expression for the autocorrelation function.

Wind Drag On Burley Tobacco Plants, James H. Casada, Linus R. Walton, Larry G. Wells

Biosystems and Agricultural Engineering Faculty Publications

Drag coefficient and center of resistance to wind forces were determined for four varieties of burley tobacco at three stages of growth and using wind velocities ranging from about 3 to 17 m/s. Drag coefficients determined ranged from about 0.024 at the highest velocity to about 0.081 at the lowest velocity. Stage of growth and wind velocity had significant effects on drag coefficient. Variety did not have a significant effect on drag coefficient. Mean center of resistance varied from 42.3 percent of the distance from bottom leaf to top leaf at the early stage of growth to 71.2 percent at …

Analysis Of Batch Scraped Surface Heat Exchange, Orrin K. Crosser, K. Y. Park

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

Evaluation Of Legibility Of Reflectorized License Plates, C. Earl Israelsen, Ronald V. Canfield

Reports

The rainfall simulator at the Utah Water Research Laboratory, Utah State University, Logan, Utah, was utilized in evaluating various types of license plates. This unique facility enables the production of controlled uniform rainfall inside the laboratory. For this experiment, rainfall rates of 0" (dry), 1/2" and 2" per hour were used to compare reflective performance of reflective sheeting (RS), beads-on-paint (BOP), and new paint (NP) license plates under dark nighttime conditions. Both new and used license plates were evaluted. The three types of new plates were made and embossed at the Idaho State Prison using stanard state manufacturing procedures. The …

A Ten Kilometer Transmission System Fiber Optics Versus Ku-Band, John A. Hallmark

Retrospective Theses and Dissertations

This research paper discusses the design evaluation and selection of a transmission system to be used in checking out the Spacelab high rate data system. The transmission systems evaluated are discussed, as well as the criteria utilized in selecting the final system. The installation of a fiber optics cable and the testing of this cable are discussed. The determination of the optimum location of the high rate data bit synchronizer and Viterbi decoder is presented. Utilization of this data to justify the installation of a shorter fiber optics system inside the O&C Building is presented.

Computer Education Masters Program And Specialist Program, Nova University

College of Engineering and Computing Course Catalogs

No abstract provided.

Doctor Of Arts In Information Science A Field-Based Program For Librarians And Information Managers, Nova University

College of Engineering and Computing Course Catalogs

No abstract provided.

Corporate Division Bachelor And Certificate Programs 1980, Nova University

College of Engineering and Computing Course Catalogs

No abstract provided.

Fade Time Statistics Of Laser Light Propagating Through Turbulent Atmosphere, Madjid A. Belkerdid

Retrospective Theses and Dissertations

The average fade time of the fluctuations in the intensity of laser light propagation in the atmosphere is analyzed. Experimental results show that the average fade time for a propagation distance of 208 meters, in the weak turbulence regime, is well described by formulas developed from a Log-Normal distribution. A circuit that calculates real time statistics of fade time is designed, then validated using a sine wave input whose fade time statistics are predetermined. The experimental signal is then tested for stationarity, and the average fade time is measured. A curve fitting is then performed for the experimental data and …

Thermally Stimulated Polarization And Depolarization Current (Tspc/Tsdc) In Glass, Chi-Ming Hong

Doctoral Dissertations

"The feasibility of studying ionic motion in glass using thermally stimulated polarization (TSPC)/depolarization current (TSDC) techniques was investigated with 4Na₂O·96SiO₂ and 30PbO·70SiO₂ (mol%) glasses. The TSDC peaks in these glasses were dependent on glass composition and attributed to bulk polarization. The high temperature background TSPC is shown to be due to dc conductivity, whereas the TSPC/TSDC peaks in the 4Na₂O glass are attributed to shorter range Na⁺ motion.

The electrical conductivity of glasses determined by TSPC agrees well with that measured by conventional ac or dc techniques. The TSPC technique is a rapid and easy method of measuring the …

Dynamic Intraesophageal Imagining Of The Heart With Ultrasound, N E. Fearnot, Charles F. Babbs, J D. Bourland, L A. Geddes

Weldon School of Biomedical Engineering Faculty Publications

Real-time images of the heart from within the esophagus are produced by a new intraesophageal ultrasonic sector scanner. Sixty images per second are displayed on a gray scale CRT in real-time and recorded on standard videotape for review. By interactive positioning of the esophageal probe, heart ventricles, atria, and valves can be visualized and their dynamics can be studied. The esophageal probe comprises four 5 MHz PZT-5 piezoelements of 6.35 mm diameter, mounted on a shaft that rotates at 900 rpm. The piezoelements are pulsed at a 5 kHz rate and the echoes are processed electronically.

Finite Element Model Of A Timoshenko Beam With Structural Damping, Louis Ablen Roussos

Mechanical & Aerospace Engineering Theses & Dissertations

A numerical integration technique, a modified version of the Newmark method, is applied to transient motion problems of systems with mass, stiffness, and small nonlinear damping. The nonlinearity is cast as a pseudo-force to avoid repeated recalculation and decomposition of the effective stiffness matrix; thus, the solution technique is dubbed the "pseudo-force Newmark method." Comparisons with exact and perturbation solutions in single-degree-of-freedom problems and with a Gear-method numerical solution in a cantilevered Timoshenko beam finite element problem show the solution technique to be efficient, accurate, and, thus, feasible provided the nonlinear damping is small. As a preliminary step into the …

A Multiprocessor System Using A Switch Matrix Configuration, Rabah Aoufi

Masters Theses

"This thesis describes a class of interconnection networks based on the use of a switch matrix to provide processor to memory communication. This switch allows a direct link between any processor to any memory module. The cost and performance of this network are analytically examined. The results are compared with those of a multiprocessor system using a time-shared bus configuration and it is shown that for the two extreme cases of maximum and minimum throughput, the two approaches are equivalent from a performance point of view. However, in the general case, even with a higher cost, the switch matrix provides …

Evaluation Of Livestock Runoff As A Source Of Water Pollution In Northern Utah, Stephen T. Wieneke, Dennis B. George, Daniel S. Filip, Brad Finney

Reports

A mathematical model was developed to predict the impact of dairy and beef cattle feedlot runoff on receiving streams. The mathematical expressions used in the model describing runoff quantity and quality were not only a function of single rain or snow precipitation events but also consecutive events prior to the runoff occurrence. The runoff quantity and quality were also a function of feedlot surface. Computer simualtions indicate that pollutants from feedlot runoff may have a significant impact on receiving streams during winter months. Runoff from feedlots located within the study area, however, had little impact on water quality in the …

Model Of Drawdown In Well Fields Influenced By Boundaries: Technical Description And User's Manual, Najwan T. Shareef, David S. Bowles

Reports

This model is designed to calculate the drawdown of a piezometric surface or water table at a given point of interest in a well field. Many different well and aquifer hydraulic conditions can be considered. The effect of field boundaries is solved by the image well theory. Many points of interest, well (recharge or injection), boundaries (barrier or recharge), and time increments as well as constant and variable pumping rate case have been included in the model. The drawdown at a point of interest can be decomposed into the following compenents for each real well due to the effect of: …