Engineering Commons^™

Force Displacement Relationship For The Prediction Of Structural Fluttering, Ladislaus Lwambuka

Tanzania Journal of Engineering and Technology (TJET)

A new presentation of force displacement relationship for the prediction of structural fluttering is discussed in this paper. This topic is limited to a detailed discussion of the derivation of the equations of motion for the rigid streamlined airfoil/flat plate system of three degrees of freedom, which yields expressions for aerodynamic resultant forces due to a steady air flow. The equations of motion presented herein are derived from the conventional classical complex presentation transformed into real matrix equations. This new presentation of the equations of motion constitutes the foundation for the latest state-of-the-art of predicting critical wind loads on the …

Numerical Investigation Of A Non-Newtonian Material Through A Sudden Pipe Expansion, V. G. Masanja

Tanzania Journal of Engineering and Technology (TJET)

A numerical method for solving two dimensional elliptic boundary-value problems of fourth order is used for finding stationary solutions of the equations of motion for a laminar flow through a sudden pipe expansion of an incompressible non-Newtonian fluid with a constitutive equation of the Reiner-Rivlin (R-R) type. Results for the Newtonian fluid, which is a special case, are in excellent agreement with those by previous investigators and they demonstrate the reliability, superiority and accuracy of the method. Results for the non-Newtonian cases could be of value for fixing ideas about visco-elastic behaviour although the R-R fluid allows only inelasticity: this …

Modelling For Potentiometric Surface Management Of Multilayer Aquifer Systems, A. Gharbi, Richard C. Peralta, K. M. Waddell

Civil and Environmental Engineering Faculty Publications

Assuring the long-term availability of groundwater of adequate quality and quantity frequently requires the implementation of appropriate ground-water and conjunctive water management strategies. Presented is a model for developing optimal strategies for an multilayer aquifer in which stream-aquifer interflow is affected by the potentiometric surface and ground-water use. The model is applied to the Salt Lake Valley. Discussed is the use of pumping to control: l) potential migration of non-point source agricultural contaminants between aquifer layers and 2) the movement of a mile-long plume caused by mining waste.

Spray Drift Reduction With Shrouded Boom Sprayers, Ronald J. Fehringer, Richard Cavaletto

BioResource and Agricultural Engineering

Downwind drift was measured from a standard boom sprayer and a shrouded boom sprayer. Using 8002 flat fan nozzles, the hooded sprayer provided a 180 to 275% reduction in drift. The effectiveness of the shroud is dependent upon the spray droplet spectrum.

Use Of Simplex Algorithm For Optimizing Simulation Models, M. Ehteshami, L. S. Willardson, Richard C. Peralta

Civil and Environmental Engineering Faculty Publications

A methodology and computer model is developed to determine economically optimum closed subsurface drainage systems in irrigated areas. The mode 1 maximizes net benefits, by comparing profit driven by crop yields to drain system cost and selects an optimum drain layout. The optimization methodology used is the SIMPLEX method (Nelder and Mead, 1965). The SIMPLEX model was linked to the subsurface drainage model DRAINMOD (Skaggs, 1982) and to the surface hydraulic model KINE (Walker and Skogerboe 1987). The selected optimum drainage system maximizes the difference between total revenue, and the total cost of installation, operation and management of a particular …

Effects Of Alternative Furrow Irrigation Parameters On Pesticide Movement In Cropped Areas In Utah, Antonio Maria Requena, Ahmad Yar Ranjha, Richard C. Peralta, Howard M. Deer, Majid Ehteshami, Robert W. Hill

Civil and Environmental Engineering Faculty Publications

Production of adequate supplies of food and fiber currently requires that pesticides be used to limit crop losses caused by insects, pathogens, weeds and other pests. Although pesticides are necessary in today' s agriculture, they can be a serious problem if they reach and contaminate ground water, especially where drinking water needs are met by ground water. The relative reduction of potential ground-water contamination due to agricultural use of pesticides was analyzed for particular sites in Utah. The potential reduction of pesticides in ground water was considered by utilizing alternative irrigation systems, water management practices and pesticides. A one-dimensional simulation …

Synergy Of Artificial Neural Networks And Knowledge-Based Expert Systems For Intelligent Fms Scheduling, Luis Carlos Rabelo, Sema E. Alptekin, Ali S. Kiran

Industrial and Manufacturing Engineering

In this paper we describe a hybrid architecture that integrates artificial neural networks and knowledge-based expert systems to generate solutions for the real time scheduling of flexible manufacturing systems. The artificial neural networks perform pattern recognition and, due to their inherent characteristics, support the implementation of automated knowledge acquisition and refinement schemes through a feedback mechanism. The artificial neural network structures enable the system to recognize patterns in the tasks to be solved in order to select the best scheduling rule according to different demands. The knowledge-based expert systems are the higher order elements which drive the inference strategy and …

Functional Requirements For Computer Conferencing And Computer Mediated Communications, Computerized Conferencing & Communications Center, Murray Turoff, Starr Roxanne Hiltz, James Whitescarver, John Foster

Computerized Conferencing and Communications Center Reports

This paper is a compilation of the desirable functionality for Computerized Conferencing Systems. It is based upon the research and evaluation activities of the Conferencing Center at NJIT and can he considered as an overall set of objectives for the development of its Conferencing Systems.

Properties And Device Applications Of Hydrogenated Amorphous Silicon Carbide Films, M. Mahmudur Rahman, Cary Y. Yang, D. S. Sugiharto, A. S. Byrne, M. Ju, K. Tran, K. H. Lui

Electrical and Computer Engineering

Hydrogenated amorphous silicon carbide (a‐SiC:H) films were deposited with a radio‐frequency plasma‐enhanced chemical vapor deposition system which utilizes a dc electric field applied independently of the inductively coupled rf field. The source gases were SiH₄ and CH₄. It was found that application of an electric field directed out of the substrate surface enhances the growth rate and yields some improvements in photoconductivity. The compositions of the films were evaluated by x‐ray photoelectron spectroscopy for a range of source gas mixtures. In order to assess the applicability of a‐SiC:H thin films, heterojunction a‐SiC:H/crystalline Si (c‐Si) diodes were fabricated …

Acuta Enews June 1990, Vol. 19, No. 6

ACUTA Newsletters

In This Issue

WMU gets 'complete' cable

President's message

Profiles of new staff members

Orlando update

Election preview

Bulletin Board

Healthcare Management: Operation Research Perspectives, Basu Ghosh

IIMB Management Review

No abstract provided.

Freight Transport Management In India Railways Through Improved Wagon Utilization, T Krishna Kumar, D M Pradyumna, R D Saklani

IIMB Management Review

Application of management concepts and tools to the service sector, particularly in the public sector, is of very recent origin. Such applications to rail freight transport, particularly in developing countries, are very few. This paper presents such an application to the problem of freight transport management in Indian Railways. The problem considered is that of efficient utilization of the scarce rolling stock -wagons. The plan of the paper is as follows. Section 2 gives a brief background of Indian Railways. A brief review of freight management models is presented in Section 3. The same section also gives a description of …

Color-Rendering Of Daylight From Water-Filled Light Pipes, Florida Solar Energy Center, Ross Mccluney

FSEC Energy Research Center®

Water-filled light pipes can be used to transport concentrated beam solar radiation from a solar collection system to a utilization system, altering the spectral distribution of the radiation in a beneficial way in the process. One use for such a system would be for the daylighting of the core interior spaces of buildings, spaces that are far removed from outside walls or the roof and are therefore not amenable to conventional daylighting with sidelights or toplights. The filtering action of the water can be used to remove unwanted infrared and ultraviolet radiation while affecting the visible portion of the radiation …

Using The Line-Transect Method To Estimate Percent Residue Cover, David P. Shelton, Elbert C. Dickey, Paul J. Jasa, Roger Kanable, Susan Smydra Krotz

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Crop residue left on the soil surface is one of the easiest and most cost-effective methods of reducing soil erosion. ~ Research in Nebraska and other Midwestern states shows ' that leaving as little as 20 percent of the soil surface covered with crop residue can reduce soil erosion by as much as one half of what it would be from residue-free conditions. Greater amounts of residue cover further limit soil erosion, Figure 1.

Residue reduces erosion in two ways. First, the residue dissipates raindrop impact energy, reducing the amount of soil that is detached. Residue also forms a …

Super Linear Learning In Back Propagation Neural Nets, Barry L. Kalman

All Computer Science and Engineering Research

The important feature of this work is the combination of minimizing a function with desirable properties, using the conjugate gradient method (cgm). The method has resulted in significant improvements for both easy and difficult training tasks. Two major problems slow the rate at which large back propagation neural networks (bpnns) can be taught. First is the linear convergence of gradient descent used by modified steepest descent method (msdm). Second is the abundance of saddle points which occur because of the minimization of the sum of squared errors. This work offers a solution to both difficulties. The cgm which is super …

Application Of Fuzzy Set Technique To Agricultural Planning, S Kumar, Narasingh Misra, B C Ghosh

IIMB Management Review

In India, agriculture remains the dominant sector of economic activity with 74 percent work force depending on it. But the share of income from agriculture sector is less than the employment in it. Also the menace of unemployment and food requirement is increasing with growing population. Hence , there is a great need for increasing production and net profit levels on one hand and employment generation on the other. Irrigation planning plays an .mportant role in increasing agricultural production, net benefit, employment generation etc. as only 32 percent of the total cultivated area is irrigated in our country. Irrigation Planning …

Safety Economic And Strategic Issues Of Indian Nuclear Power Programme, V Ranganathan, Sanjay Kanoongo

IIMB Management Review

No abstract provided.

A Systematic Evaluation Technique For Assisting In The Identification And Prevention Of Wrist Stress In The Work Place, Karen Kleinfeld

Masters Theses

Carpal Tunnel Syndrome is a cumulative trauma disorder involving compression of the median nerve within the wrist. This disorder has become an industrial epidemic, striking workers whose daily activities involve repetitive motion, wrist deviation, awkward finger postures, and excessive forces to the hand. In an effort to identify and control existing trauma, as well as prevent the onset of further cases of CTS, a systematic evaluation technique has been developed to assist in the ergonomic analysis of the work place. This assessment technique identifies and quantifies occupational risk factors of a task that may predispose workers to CTS. With this …

Coke Oven Emissions: A Case Study Of Technology-Based Regulation, John D. Graham, David R. Holtgrave

RISK: Health, Safety & Environment (1990-2002)

After examining and analyzing the experience with coke ovens, the authors conclude that attempts to force technology beyond its demonstrated competence can be both expensive and ineffective in controlling hazards. They also suggest implications for pending proposals to further control air pollution.

Modcad: A Graphic Predetermined Time Standards Software For The Ibm P.C., Raad A. Dawood

Masters Theses

MODCAD is a software program designed to give MODAPTS (MODular Arrangement of Predetermined Time Standards) the capability to generate workplace layouts that can be used in conjunction with the time study analysis. Software packages have been developed for MODAPTS such as MODAPTS Plus and Task Master that allow the user to input the predetermined codes of MODAPTS.

AutoCAD (a computer aided design software) is used to combine MODAPTS codes and workplace layout drawings in a single environment by customizing the standard AutoCAD menus and icons to include the MODAPTS codes and routines. AutoLisp (AutoCAD resident language) is used to write …

Parallel Implementation Of A Recursive Least Squares Neural Network Training Method On The Intel Ipsc/2, James Edward Steck, Bruce M. Mcmillin, K. Krishnamurthy, M. Reza Ashouri, Gary G. Leininger

Computer Science Faculty Research & Creative Works

An algorithm based on the Marquardt-Levenberg least-square optimization method has been shown by S. Kollias and D. Anastassiou (IEEE Trans. on Circuits Syst. vol.36, no.8, p.1092-101, Aug. 1989) to be a much more efficient training method than gradient descent, when applied to some small feedforward neural networks. Yet, for many applications, the increase in computational complexity of the method outweighs any gain in learning rate obtained over current training methods. However, the least-squares method can be more efficiently implemented on parallel architectures than standard methods. This is demonstrated by comparing computation times and learning rates for the least-squares method implemented …

Estimation Of Equivalent Axleloads Using Data Collected By Automated Vehicle Classification And Weigh-In-Motion Equipment, Herbert F. Southgate

Kentucky Transportation Center Research Report

The primary objective of this research study was to modify the existing EAL estimation system to include data obtained using the Golden River Weigh-In-Motion system and automated vehicle classification equipment. Data are to be collected over a three-year cycle in accordance with the FHWA Traffic Monitoring Guide. Having the capability of moving the portable weigh-in-motion scales to locations other than interstate sites permits the collection and analyses of specific data at sites on other highway functional classifications. Such data permits estimating both accumulated and future EAL requirements for that site. Such data permits estimating EAL requirements for sites on the …

Louisa Bypass Experimental Project, Kamyar C. Mahboub, L. John Fleckenstein

Kentucky Transportation Center Research Report

In an effort to reduce rutting in the new Louisa Bypass in Lawrence County, Kentucky, a large-stone asphaltic base mix (Class K) was used in the base layer. A one-inch surface wearing course was used in this project, a polymer-modified asphalt was used in the surface course on half of the project. In order to facilitate subsurface drainage, a free draining subbase (No. 57's) was placed between the large-stone base and a dense-graded aggregate (DGA) layer. The drainage design was further enhanced by edge and median drains. Construction processes were monitored and photographed. Laboratory and field studies were conducted to …

Large-Stone Mixes For Reducing Rutting, Kamyar C. Mahboub

Kentucky Transportation Center Research Report

Large-stone mixes are becoming a very popular means for reducing rutting in flexible pavements. Aggregate interlock in large-stone mixes provides for very efficient dissipation of compressive and shear stresses that are known to be responsible for rutting and shoving in flexible pavements. This report documents mix design procedures and laboratory testing for characterization of rutting potential of large-stone asphalt mixes (LSAM) in Kentucky and particularly the Louisa Bypass project.

A series of large-stone aggregate gradations were studied. A promising aggregate gradation was selected in cooperation with Kentucky Department of Highway officials and representatives of the asphalt industry. Based upon the …

Performance Report On Corrugated Polyethylene Pipe, N-12, L. John Fleckenstein, David L. Allen

Kentucky Transportation Center Research Report

This paper documents the installation and performance ofN-12 pipe installed during construction of South Forbes Road in Fayette County, KY 54 in Daviess County, US 62 in McCracken County, Nicholasville Road in Fayette County, and US 68/KY 80 in Warren County. The pipe is manufactured by Advanced Drainage Systems, Inc., and is designated as ADS N-12. ADS N-12 is a corrugated high-density polyethylene (HDPE) pipe. The pipe has a corrugated exterior for increased strength and a smooth interior to provide maximum flow capacity.

The N-12 pipe requires less equipment and fewer personnel than steel or concrete pipe for installation. From …

Summary Of Results Of 1989 Field And Laboratory Evaluations Of Pavement Marking Materials, Kentucky Transportation Center

Kentucky Transportation Center Research Report

This report summarizes the results of data collected as part of the field and laboratory evaluations of pavement marking materials for the SASHTO Regional Test Facility. The purpose of the Regional Test Facility (RTF) is to minimize the amount of field and laboratory research testing of specific types of materials. This is accomplished by combining efforts in an organized manner to reduce the monetary and man-hour requirements of both the states and industry. A RTF for the twelve SASHTO states was approved at the 1988 SASHTO convention. The twelve SASHTO states are Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North …

Irish Building Services News

Building Services Engineering

No abstract provided.

Computer Aided Localization Of Neurological Diseases, Yusuf Parlar

Dissertations

Computers in medicine has brought new dimensions and better understanding of uncertainties in the field of medical sciences in the last decade. This thesis is focused upon the localization of neurological lesions in the human nervous system. It relates clinical neurological test outcomes to pathways of function or malfunction. Certain methods are proposed-empirical. stochastic. Deterministic-to estimate the spatial distributions of lesion probabilities.

First. a Bayesian model is presented to estimate the posterior probability of lesion from a priori information, based on the test outcomes. Due to unavailable data alternative methods and models are presented: Regression Analysis. Monte Carlo simulation, and …

On The Performance Of Minimum Redundancy Array For Multisource Direction Finding, Byung-Seub Lee

Dissertations

As an application of power spectrum estimation, the multi-source direction finding has been evolved from conventional FFT method to Superresolution methods such as Multiple Signal Classification(MUSIC) algorithm. Uniform Regular Array(URA) was mainly used in all these approaches.

The Minimum Redundancy array(MRA); a non-uniform thinned array which results in an input signals covariance matrix with minimum redundancy has been shown to have certain interesting properties for spectrum estimation. Only recently it was suggested to use the MRA for spatial estimation. The purpose of this research was to study the performance of this array in multi-source direction finding estimation and compare it …

Computer Modeling And Analysis Of Biological Rhythms, Shi Xiong Yang

Dissertations

Biological rhythms are an important phenomenon and feature of physiologic systems. Indirect means have to be employed for their description and exploration due to the unclear internal nature of the system. This study analyzed and developed several possible mathematical models using single or multidimensional nonlinear differential equations to approach the experimental circadian data. The numerical solutions of the models were obtained by computer simulation and the simulated and experimental acquired circadian data were analyzed in both the time and frequency domains. Phase plane plots, phase response curves and power spectrum analysis were employed to determine the nonlinearity of the system …