Engineering Commons^™

Deterministic Linear Predictors For Bit Rate Improvement, Dhanvant H. Goradia

Electrical & Computer Engineering Theses & Dissertations

This thesis addresses the application of deterministic linear predictor s for telemetry based systems. Deterministic linear predictors are considered as a viable alternative to block transform coding in order to achieve bit rate reduction. A method of calculating the predictor coefficients of a deterministic linear predictor is presented. The system model is developed parametrically with respect to the bandwidth, polynomial order, signal class and predictor length. Two classes of signals, deterministic and random are analyzed and bounds on the performance of the deterministic linear predictor are established. A family of six pole Butterworth filters are used as presample filters in …

A Non-Linear Vortex Panel Method For Wings With Edge Separation, Vijay Kalburgi

Mechanical & Aerospace Engineering Theses & Dissertations

A global nodal vortex panel method is developed to predict steady aerodynamic loads on rectangular lifting surfaces with side edge separation. The lifting surface and free shear layers are modeled by bound and free vortex sheets respectively, which are then discretized into triangular bound and free vortex panels respectively. On each triangular panel, a linear distribution of vorticity is defined in terms of the global components of vorticity at its nodes. The velocity field induced by any triangular vortex panel is obtained in closed form. The vortex core of the side edge vortex is modeled by a concentrated core of …

Dynamic Analysis Of An Earth-Orbiting Satellite Deploying Hinged Appendages, Kevin Fielding Oakes

Mechanical & Aerospace Engineering Theses & Dissertations

The planar liberational dynamics of an arbitrary spacecraft with deployable hinged appendages is presented here both analytically and numerically. The system model consists of a central rigid satellite moving about the earth in a circular orbit at a uniform orbital rate. Attached to the satellite are two unfolding rigid booms with specified mass and length. Tip masses are included at the ends of each boom and deployment is driven by torsional springs at both frictionless hinge points. The equations of motion are developed for both a single- and double-appendage model through the use of Lagrange's equations. The formulation accounts for …

Erosion Of Yellow Brass And Type 304 Stainless Steel In A Gas Blown Spark Gap, Rakasi Madhava Reddy

Mechanical & Aerospace Engineering Theses & Dissertations

Erosion rates of yellow brass and type 304 stainless steel electrodes were studied in air under pulse discharge conditions at a voltage of 100 kV, a current of 20 kA, and pulse durations of 70 ns. Anodes and cathodes, configured vertically, were fitted with removable hemispherical tips having a diameter of 0.95 cm and a mass of 3 gm. Tests were conducted inside a low speed, high pressure wind tunnel at pressures of 30 and 50 psig and air velocities ranging from 0 to 36 nm/s.

Erosion was studied gravimetrically for several flow velocities. As many as 60,000 discharges were …

An Evaluation Of A Taylor-Galerkin Algorithm For High Speed Inviscid Flows Using Quadrilateral And Triangular Elements, Kim S. Bey

Mechanical & Aerospace Engineering Theses & Dissertations

The Taylor-Galerkin finite element algorithm is used to obtain solutions to the two-dimensional compressible Euler equations. The mathematical formulation of the algorithm is presented for a typical scalar equation. The derivation results in element equations which are assembled over the entire solution domain to obtain the system of equations that are solved explicitly. The algorithm has the unique feature that the finite element matrices can be evaluated in closed form, avoiding expensive numerical integration. Aspects of vector programming strategies and mesh generation important to an effective analysis procedure are also described. Solutions to supersonic flow problems with exact solutions are …

Convective Heat Transfer From Circular Cylinders Located Within Perforated Cylindrical Shrouds, Kamran Daryabeigi

Mechanical & Aerospace Engineering Theses & Dissertations

The influence of perforated cylindrical shrouds on the convective heat transfer to circular cylinders in transverse flow has been studied experimentally. Geometries studied were similar to those used in industrial platinum resistance thermometers. The influence of Reynolds number, ventilation factor (ratio of the open area to the total surface area of shroud), radius ratio (ratio of shroud's inside radius to bare cylinder's radius), and shroud orientation with respect to flow were studied.

The experiments showed that perforated shrouds with ventilation factors in the range 0.1 to 0.4 and radius ratios in the range 1.1 to 2.1 could enhance the convective …

Laser Pump And Probe Excited State Absorption Measurements, Shawpin Jong

Electrical & Computer Engineering Theses & Dissertations

A pump and probe technique was used to investigate triplet-triplet excited state absorption in solutions of the scintillators 2,5 diphenyloxazole (PPO) and 2,1 naphthyl,5 phenylzole (a-NPO) in several solvents.

KrF excimer radiation (248 nm) was used to pump the samples under investigation as well as a tunable dye laser which was used as the probe. Time-resolution was obtained by changing the optical path difference between the pump and probe beams.

Transient excited state absorption was measured in a wide spectral region between 330 nm and 600 nm, showing a peak at 400 nm for PPO solutions, and two …

Acuta Enews March 1986, Vol. 15, No. 1986

ACUTA Newsletters

In This Issue

President's Message

Party Line

Centrex -- How Viable Today? Tomorrow?

Consultant's Corner

Accunent Switched 56 is providing switched digital transmission now

Traction Characteristics Of Prepared Traffic Lanes, Eddie C. Burt, James H. Taylor, Larry G. Wells

Biosystems and Agricultural Engineering Faculty Publications

Traction characteristics of lugged and smooth tires were compared on prepared traffic lanes and on conventional seedbed conditions. Results indicated that elevated traffic lanes offer important traction advantages over seedbeds in wet soil conditions. In dry soil conditions, traction on elevated traffic lanes was sometimes less than on the seedbed conditions. A timeliness advantage in mobility for the elevated traffic lanes was found to be up to 2 days in extremely wet conditions. A non-elevated traffic lane showed no traction advantage in wet conditions.

Delineation Of Horizontal Curves, Kenneth R. Agent, Tom Creasey

Kentucky Transportation Center Research Report

The objective of this study was to investigate the ability of various traffic control measures to delineate horizontal curves so drivers would perceive the curve and slow to an appropriate speed and then be provided guidance through the curve. Pavement delineation (raised pavement markers, transverse stripes, or rumble strips) and shoulder delineation (post delineators and chevron signs) were used. A laboratory test found that a post delineator configuration in which the distance from the post to the pavement edge and the post spacing remained constant while the height of the delineator on the post increased made a curve appear sharper …

A Systolic Parsing Algorithm For A Visual Programming Language, Adam W. Bojanczyk, Takayuki Dan Kimura

All Computer Science and Engineering Research

In this paper we consider a problem of parsing a two-dimensional visual programming language Show and Tell on a two-dimensional array of processors. A program in Show and Tell is a bit-mapped, two-dimensional pattern satisfying a certain set of grammatical rules. The pattern consists of partially ordered set of rectilinear boxes and arrows distributed over the space of nxn pixel area. The corresponding directed graph, the box graph, where boxes are nodes and arrows are directed edges, may not have a cycle in a Show and Tell program. The cycle detection is the most computationally intensive stage of the parsing …

Show And Tell User's Manual, Peter Mclain, Takayuki Dan Kimura

All Computer Science and Engineering Research

The purpose of this report is to introduce essential features of the Show and Tell Language system to those computer users who are already familiar with some high-level programming language such as FORTRAN, BASIC or PASCAL. This manual is not intended for school children. Some familiarity with the Macintosh user interface and the MacPaint application program is assumed. It is also assumed that the Show and Tell application program disk and the Sample program are available to the reader. The basic programming concepts in Show and Tell are introduced in Chapter Three. The reader may find it easer to start …

Access Control For Local Roads And Streets In Small Cities And Rural Areas, Hussein F. Dia, Jon Fricker

Indiana Local Technical Assistance Program (LTAP) Publications

This manual is a response to the need expressed by local public officials in small cities and rural areas for a single reference book on the subject. A variety of scattered references have been combined into a single volume with small communities in mind. The authors hope that this manual will be of value to street commissioners, road supervisors, and city and county engineers throughout Indiana.

Tillage Systems For Row Crop Production, Elbert C. Dickey, Paul J. Jasa, Alice J. Jones, David P. Shelton

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Selecting the tillage system best suited to a particular farming situation is an important management decision. Formerly, the traditional system was a moldboard plow operation followed by several secondary tillage operations before planting. This system can be appropriate for poorly drained soils having little or no slope and low erosion potential. However, plowing has several disadvantages . The potential for soil erosion is high on sloping lands, and labor and fuel requirements can be substantially higher than with other tillage and planting systems.

Today, conservation tillage systems are used to reduce preplant tillage operations, thus reducing soil erosion and moisture …

Evidence For Amphoteric Behavior Of Ru On Cdte Surfaces, D. N. Bose, S. Basu, K. C. Mandal, D. Mazumdar

Faculty Publications

No abstract provided.

Transplanter Mounting Attachment For A Harvester, Larry D. Swetnam, James H. Casada, Linus R. Walton

Biosystems and Agricultural Engineering Faculty Patents

A transplanter mounting attachment for attachment to a crop harvester including a pivot shaft operatively connected for rotation about an axis extending longitudinally with respect to a support frame of a crop harvester. A rotating sleeve substantially orthogonally disposed with respect to the pivot shaft and rotatably mounted relative thereto. A connecting shaft substantially orthogonally disposed with respect to the pivot shaft and rotatably mounted relative thereto. At least one transplanter attaching assembly operatively connected to the rotating sleeve and being raised or lowered upon rotary motion being imparted to the rotating sleeve. Wheels are provided which are operatively connected …

Santa Clara Magazine, Volume 28 Number 3, Winter 1986, Santa Clara University

Santa Clara Magazine

2 - IS SILICON VALLEY A HOUSE OF CARDS? By Michael S. Malone. A fresh, freewheeling forecast of the future of Silicon Valley.

7 - MOTIVATING CHILDREN TO SUCCEED By Ruth E. Cook. The author suggests some guidelines for helping children who don't work up to their true potential.

11 - IN SEARCH OF HUMANITY By William J. Rewak, S.J. Santa Clara's president explores the university's role in the development of the human person.

16 - LEARNING TO LEAD A photo feature of executives at the beach, engaged in a new and appealing program from the Executive Development Center that …

Acuta Enews February 1986, Vol. 15, No. 2

ACUTA Newsletters

In This Issue

President's Message

Party Line

ACUTA Spring Seminar

Columbia University

Data Network Considerations

Project Description- Systems Management and Billing

Project Description- Stations

Bits & Pieces

Thermomechanical Design Criteria For Ceramic-Coated Surfaces, Robert L. Mullen, J. Padovan, Minel J. Braun, Benjamin T.F. Chung, G. Mcdonals, Robert C. Hendricks

Mechanical Engineering Faculty Research

Some early history of ceramic applications is presented. Finite element modeling of components to determine service and fabrication loads found inelastic behavior and residual stresses to be significant to component life. Inelastic behavior mitigates peak strains but enhances residual strains. Results of furnace, Mach 0.3 burner, and engine tests are discussed and categorized into design criteria (loading, geometry, fabrication, materials, analysis, and testing). These design rules and finite element analyses are brought to bear on two test cases: turboshaft engine seals, and rocket thrust chambers.

Lexical Analysis Using Table Look-Up, Brian Keith Smith, Dominic Soda, George Winston Zobrist

Engineering Management and Systems Engineering Faculty Research & Creative Works

No abstract provided.

Computer Application Of Project Planning And Scheduling With Cpm, Mohamed Tarek Abdel-Aziz

Theses

Scheduling is one of the most important tools for project management and control, and the CPM is one of the techniques used in project scheduling.

The primary objective of this thesis is to develop a CPM computer package using a microcomputer. The package is constituted in Basic (Applesoft Basic) for use on Apple II Plus, IIe or IIc.

The package is intended to be available to users without sufficient knowledge about computer. And it consists of two computer programs. The first computer program is the CPM-I which schedules project activities with unlimited resources. The second computer program is the CPM-II …

Simulation Of A Microprocessor Controlled Drill Press, Arun J. Ayyagari

Theses

The concept of flexible manufacturing systems has ushered new dimensions into machine tool design. The power of this new technique is that a high degree of flexibility in a machine tool can be easily achieved by developing a software based control system as against conventional hard wired systems in existence.

To demonstrate this point, a microprocessor based control system is developed, in this thesis, to control the automated drill press. The Motorola MC6808 8-bit microprocessor is chosen as an example.

The microprocessor first evaluates the optimum cutting parameters for the given cutter size, work material and operation. It then uses …

Use Of Clay As A Landfill Liner, Mayur B. Desai

Theses

The purpose of this thesis is to study the factors affecting efficient functioning of clay material for containment of landfill materials. The study of liner-leacheate interaction is done from the consolidation and vane shear tests on various clays having different activities, and chemicals that are typically found in a municipal solid waste leachate and a leachate collected from an active landfill.

An effort was made to study the use of Atterberg limits to predict the suitability of a clay as a landfill liner for a given waste environment. The study indicates that there is a decrease in permeability of bentonite …

Analysis And Evaluation Of The Developments In The Use Of Coal, Farid Najib Elkheshen

Theses

This thesis is a survey and evaluation of the developments in the use of coal. It deals with the social, economic, physical, and biological impacts of such a shift. It examines the complete coal system, from extraction to combustion, including the key steps and policy initiatives. The United States, with 6% of the world's population, consumes about 33% of its commerical energy supply - while the available reserve coal is about 80% of total energy in the United States, with coal use representing only 17%, oil and gas about 78% at present.

Technologies under development that might reduce costs, increase …

Computational Method For Solving The Kinematics Of Mechanisms Using Matrix Methods, Rajat Pardal

Theses

This thesis deals with the computational methods for kinematics of mechanisms using matrix methods. The method is particularly suited to the complex mechanism problems for which hand calculations are difficult. The thesis first reviews the matrix methods on which the program IMP is based. A computer program developed by Ve Tung using the same theory is enhanced in this thesis. By using this revised program, comparison between the non-linear algebraic approach and the matrix methods developed in this thesis has been made by the help of suitable examples. Further, it has been proved that the Integrated Mechanisms Program does not …

Design Of Code Division Multiple Access Systems, Nakrendrakumar Patel

Theses

The intent of the work "Design of Code Division Multiple Access systems (CDMA) " is to consider different aspects of design with their effect on system performance. The generation of binary shift register sequences, that is maximal length sequences, with their properties are presented. From these maximal length sequences the Gold codes are obtained which are the most suitable approximately orthogonal codes for designing CDMA systems. These are discussed with their specific crosscorrelation properties. An extensive discussion is given of the difficult problem of synchronization, thatis bothacquisitionandtracking of pseudonoise sequences. Different synchronizing methods are discussed along with their relative performance. …

Saturated Hydraulic Conductivity Of Brunswick Soil With Aqueous Benzene Solution, Thomas R. Pisciotta

Theses

Tests measuring saturated hydraulic conductivity and dispersivity were conducted on Brunswick soil using an aqueous solution of benzene. The tests were performed using a flexible wall permeameter which was modified to allow extraction of effluent samples immediately upon exit of the test specimen. Influent and effluent samples were analyzed with a gas chromatograph in order to quantify dispersion and sorption in the specimen.

The test was performed using a confining pressure of 70 psi. and a hydraulic gradient of 100.3. Using a sample statically compacted to 99.2% of the Modified Proctor maximum density and tap water as a permeant, stable …

Identification Of Material Constants Of Human Bone Using Finite Element Method For Micropolar Elasticity, Sajid Mannan Sayed

Theses

Bone differs from most engineering materials in the composition of its structure. The classical theory of elasticity fails to correctly predict the stress concentration effects in bones with precracked or notched surfaces, and can be applied only to those materials which exhibit more homogeneity and isotropicity than bone. Therefore, generalized continuum theories, which have addditional degrees of freedom, must be used to determine the stress concentration effects in human bone, especially in regions of high strain gradient, such as a hole or an interface.

In this thesis, efforts have been made to identify the material constants of human bone since …

Computerized Work Measurement System, Vrajesh Shah

Theses

This thesis is concerned with the application of computerized work measurement to improve productivity and efficiency of production workers. In doing so, the techniques of MOST (Maynard Operation Sequence Technique) is studied to determine its appropriateness for industrial use. The advantages and disadvantages of the system are studied as to its value to large and small industries.

Development Of Dynamic Analysis Program Mini-Dymac, Shang-Rou Shien

Theses

The computer program DYMAC developed by B. Paul automatically generates and numerically integrates the equations of motion of closed loop multi-body mechanical systems. The theory behind this program is Larange's form of d'Alembert's principle. However, it is not an easy task for the beginners to understand this program completely. If there is a simplified version of the program, it will be of great help for those people to understand the essential organization of the program.

Using the same theory of DYMAC, computer program MINI-DYMAC is developed in this thesis and hoped to serve as an educational version of DYMAC. For …