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An Investigation Of The Criteria Controlling Sustained Self-Excited Oscillations Of Cylinders In Flowing Water, R. King

Symposia on Turbulence in Liquids

In this paper, water channel experimental data are discussed and compared with conventional wind-tunnel data. Stability criteria are proposed for the cross-flow and flow directions of oscillation. Fluctuating drag force coefficients are deduced from a linear mathematical representation of the cylinder located in flowing water and oscillating in the flow direction.

Local Mass Transfer In Turbulent Flow By Electrochemical Methods, C. Deslouis, I. Epelboin, B. Tribollet, L. Viet

Symposia on Turbulence in Liquids

Mass transfer to the surface of rotating electrodes during turbulent flow was studied by electrochemical methods under steady and non-steady state diffusion conditions.

The flow was due to a large rotating disk made from insulating material, flush with the surface of which was mounted a ring shaped electrode of platinum or nickel.

A local study of the radial component of the convective diffusion in turbulent flow was carried out with very thin ring electrodes (width ΔR ~ 0,05 mm). The diffusion layer thickness was varied relatively to the diffusion sublayer thickness by changing the ring width or the rotation speed …

Experimental Study Of Turbulence In Plane Separated Flows, R. Smyth

Symposia on Turbulence in Liquids

Some recent attempts at predicting turbulent two- dimensional recirculating flows have concentrated on modelling the turbulent energy equations used in the finite difference analysis methods of solutions of the elliptic partial differential equations governing these flows. These attempts have to some extent been restricted by the lack of experimental studies of the high turbulence intensities found in separated flows. The improvement of the pulsed hot-wire anemometer and the laser Doppler anemometer have made possible such studies and this paper describes an investigation using the laser Doppler anemometer in a separated flow situation. Results are given of an experimental study of …

Some Observations Of Wake Behavior In Laminar And Turbulence Free Stream Flow, L. E. Seeley, R. L. Hummel, J. W. Smith

Symposia on Turbulence in Liquids

Visual observations of the sphere wake have been obtained using the flash photolysis technique. Free stream turbulence of 7 and 10% was found to progressively reduce the size of the wake but no turbulence was found in the attached shear layer nor was the position of the separation point affected. A separation bubble was identified as predicted by Son and Hanratty (1969). Evidence is presented to show that drag reduction in turbulent free streams is not due to turbulence in the attached boundary layer but to enhanced momentum transfer in the wake.

The Roles Of Large Scale Structures In The Initial Development Of Circular Jets, F. K. Browand, J. Laufer

Symposia on Turbulence in Liquids

Experimental results are presented describing the flow field surrounding the potential core of a circular water jet in the Reynolds number region between 5,000 and 15,000. This field is divided into three regions: 1) the shear layer instability zone; 2) the vortex interaction region; and 3) the zone of higher order instability mode and turbulence generation. It is shown that the origin of the large scale structures just downstream of the potential cone can be traced to the upstream vortices, but their statistical behaviour (passage frequency, spatial coherence) seems to be independent of the initial shear layer instability.

Stereoscopic Photography Of Shear Flow Turbulence, A. K. Praturi, H. C. Hershey, R. S. Brodkey

Symposia on Turbulence in Liquids

The last several years have seen numerous advances in the understanding of the coherent motions that exist in turbulent shear flows. These studies have provided the underlying basis of most of the experimental investigations of coherent motions using conditional sampling, quadrant splitting, pattern recognition, etc. Lacking, however, in the visual work is a true three- dimensional view of the processes, which are known to be three-dimensional in nature. Possible means of providing information about the third dimension are reviewed. Details of an evaluation of a stereoscopic-photographic, high-speed motion picture system are given. The system utilizes the boundary layer flow channel …

17th Annual Rocky Mountain Spectroscopy Conference

Rocky Mountain Conference on Magnetic Resonance

Final program and abstracts from the 17th annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 4-8, 1975.

Steady State Fluidics: The Static Matching Of Fluidic Amplifiers And Loads, Frank J. Redd

Theses and Dissertations

"Fluidics" is the title applied to a relatively new technology which is concerned with the control of fluid power and the processing of information through the use of the fluid mechanical properties of the fluid medium itself. The absence of moving parts and the relatively low sensitivity to enviromental conditions suggest the probability that fluidic systems will prove to be faster and more reliable than the mechanically controlled (valves, diaphragms, springs, etc.) fluid systems which they are designed to replace.

Waviness Distortion In Mechanical Face Seals, Joseph J. Roesch

Mechanical Engineering ETDs

In this thesis the phenomenon of waviness distortion in mechanical face seal washers is investigated. Waviness in face seals leads to leakage in some applications. When leakage becomes significant, the seal must be replaced. If the distortion causing mechanism can be described, improvement in seal performance and behavior may be possible.

The components and function of the mechanical face seal are first discussed. It is seen that only one component of the seal unit shows significant deterioration over a period of time. It is also seen that this component, the face washer, wears in a characteristic manner. The characteristics of …

Computer Aided Design For Fluidic Sequential Circuits Of Fundamental Mode, Yau-Hwang Lee

Dissertations and Theses

This thesis presents the method of state diagram synthesis and the development of a computer program for designing fluidic sequential feedback control circuits of the fundamental mode. A paper on state diagram synthesis was authored by Chen and Lee, presented in Detroit and published as ASME paper 73-WA/Flcs-2 in 1973.

Hypothetical systems are illustrated by using series of events characterized by the piston positions of some double-acting pneumatic cylinders. In these systems , an action can only begin when the previous action has been completed. Every extension or retraction of a piston is memorized and manifested by a flip-flop element …

Investigation Of Electron-Beam Deposited Titanium Dioxide On Silicon For Application In Mos Devices, William David Brown

Electrical and Computer Engineering ETDs

Titanium dioxide (Ti02) has been studied to determine the feasibility of using this dielectric material in Metal-Insulator-Semiconductor (MIS) structures. MIS structures utilizing various dielectric materials have received considerable attention in recent years. Materials such as titanium dioxide which exhibit a high permittivity are attractive as insulators in MIS devices because of high capacitive density, good surface control for thick films, large power handling capability, and reduction in device size.

An Examination Of Thermal Stress As A Mechanism For Cladding Failure In A Hypothetical Lmrbr Transiet, Douglas Wakerfield Croucher

Nuclear Engineering ETDs

Stainless steel clad uranium dioxide fuel pellets were pulse irradiated in the Annular Core Pulse Reactor to evaluate thermal stress as a contributing mechanism for cladding failure in hypothetical LMFBR transients. The 6.2 mm diameter UO2 fuel pellets, with enrichments up to 25 w/o 235UO2, were helium bonded to 0.381 mm thick Type-316 stainless steel cladding and were irradiated in a helium environment with reactor pulses having initial periods as short as 1.5 milliseconds. In experiments conducted elsewhere with longer initial periods, the primary fuel failure mechanisms observed were differential fuel-cladding thermal expansion, intragranular fission-gas-induced fuel swelling, transient fission gas …

Use Of Sodium Chloride Windows In The Infrared Spectral Analyses Of Irradiated Thin Insoluble Polymer Films, W. F. Oberbeck, Kenneth G. Mayhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

Siganal-A Modular Signal Analysis Program, Ramon Anthony Tenorio

Electrical and Computer Engineering ETDs

Many Scientists and Engineers who record experimental data often require that their data be analyzed via various digital techniques in the shortest possible time. The Signal Analysis Program (SIGANAL) described in this report is a modular program that:

1. Provides multiple function analysis in one computer run.

2. Provides a method of input that parallels the users analysis requirements.

3. Provides state-of-the-art digital techniques for Frequency domain analysis such as Power Spectral Densities, Cross Spectral Densities, Transfer Functions and Coherence estimates.

4. Requires less than 30000₁₀ words of central memory.

The Use Of A General-Purpose Heat Transfer Code For Casting Simulation, William Carl Erickson

Electrical and Computer Engineering ETDs

The practical use of numerical techniques in simulating casting solidification dictate that a general purpose heat transfer code be used and that results be obtained in an easy-to-analyze format. Color film plotting routines were developed for use with NASA's CINDA-3G heat transfer code; the combination of which meet the above criteria. The subroutine LQSLTR written for SINDA, the successor to CINDA-3G, was verified by comparing calculated results obtained using LQSLTR with those obtained using the specific heat method for handling the heat of fusion. Excellent agreement existed when similar data was used. When the more restrictive requirement of a 1° …

A Prompt D-D Neutron Calibration Of A Plastic Scintillator Detector, Dal H. Jensen

Nuclear Engineering ETDs

ABSTRACT

A new approach to the measurement of the neutron yield of low intensity (~ 2 x 10 neutrons/pulse) 0-0 neutron generators in a single pulse is described. A cylindrical (20.32 cm radius by 20.32 cm height) scin­tillator of Pilot-Bis optically coupled to a Phillips 57AVP photomulti­plier with a 20 cm diameter photocathode. The light pulse resulting from the neutron burst is fed into a voltage integrator calibrated in neutrons/ count.

The initial calibration of the stable neutron generator used in the scintillator calibration was performed using a silver activation detector (PT-502) designed by LASL. The data obtained for the …

Safeguards Considerations For A Htgr Nuclear Fuel Cycle, Philip G. Johnson

Nuclear Engineering ETDs

Given that the prime objective of safeguards for special nuclear materials (SNM) is nonproliferation of nuclear weapons, it is logical that safeguards priorities should be commensurate with the relative suitabilities of the various SNM forms in existence for application in nuclear explosives. The SNM forms in each reactor fuel cycle, for example, should be screened and ordered according to their relative suitabilities for such misapplication. Significant considerations in assigning protection priorities include the relative suitabilities based on materials characteristics, inherent protection features of the mateerials or the processing of the SNM forms, the quantities of these materials in existence, and …

The Status Of Metric Conversion In Industrial Education Programs In Utah With Recommendations For Statewide Training Programs, Thomas J. Brames

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to obtain information from Industrial Education teachers in Utah concerning their feelings and attitudes toward conversion to the Metric System in the United States and to determine their present familiarity with that system. The study was also designed to identify potential problem areas which would tend to influence educational programs on the Metric System for Industrial Education teachers in Utah.

A select sample of four-hundred twenty-three Industrial Education teachers representing over twenty occupational areas was chosen as the population for the study. Two-hundred ninety-seven usable questionnaires (70.2 per cent) were returned and tabulated as …

Methods For Calculating Energy Deposition Using Coupled Neutron-Gamma Ray Transport, Lewis Douglas Rigdon

Nuclear Engineering ETDs

In radiation damage problems, it is desirable to know not only the neutron and gamma ray fluxes but also the energy deposition due to those fluxes. Following the recent availability of coupled neutron-gamma ray, multigroup-multitable cross sections and associated fluence-to-KERMA factors, an automated method has been developed for obtaining the energy deposition in a material region due to local neutron and gamma ray fluxes. Cross section sets which combine neutron and photon transport as well as a production matrix for neutron-induced gamma rays are used in the transport calculation. Thus in one discrete ordinates transport calculation, the energy deposition from …

Alcohol Assisted Hydrocarbon Fuels: A Comparison Of Exhaust Emissions, Power Output And Fuel Consumption Using Static And Dynamic Engine Test Facilities, Dwight J. Bushnell

Theses and Dissertations

America’s energy crunch— something new for a country that has been used to great affluence. America’s smog— an eye stinging, lung burning situation which the Environmental Protection Agency has "promised" to rectify. These are two outstanding problems that face the engineer and scientist of today. The end of the era of cheap gasoline has brought the beginnings of a quiet revolution to Detroit: an improvement in the efficiency, economy and emission level of the American automobile. Word has penetrated to the automotive engineers that the emissions level, fuel economy and automobile safety are the prime design considerations for the automobile …

Study Of Cold-Formed Steel Structural Members Made Of Thick Sheets And Plates, William M. Mckinney, Victor A. S. Liu, Wei-Wen Yu

CCFSS Library (1939 - present)

This final report presents the results of a study of cold-formed steel structural members made of thick sheets and plates. It contains the following two parts:Part I - Local Buckling of Cold-Formed Steel Structural Members Having Compression Elements which Exhibit Initial Out-of-Flatness Part II - Effects of Cold Work on Mechanical Properties of Thick, Cold-Formed Steel Members and Bolted Connections Part I was originally a thesis prepared by William M. McKinney for the degree of Master of Science in Civil Engineering in May, 1974. Part II was originally a thesis prepared by Victor Ai-Shen Liu for the degree of Doctor …

Load Factors For Wind And Snow Loads For Use In Load Resistance Factor Design Criteria, M. K. Ravindra, Theodore V. Galambos

CCFSS Library (1939 - present)

This report presents the background and the derivations for the determination of the mean maximum loads and the corresponding load factors for wind and snow loading for use in Load and Resistance Factor Design Criteria for steel building structures.

Determination Of The Most Economically Feasible Method For High Volume Machining Of A Discharge Port In A Powder-Metal Compressor Cylinder, Perry W. Carter

Theses and Dissertations

The purpose of this study was to ascertain the most economically feasible method for high volume machining of a discharge hole in a power metal compressor cylinder.

Integrated Circuits, Julio Garcia

Graduate Research Papers

The technology of integrated circuits is_ almost new in Peru, writer's country-. It is being used mainly in black and white television sets and in some audio amplifier equipment. As any new technology, first, it is necessary to be very familiar with it in order to exploit it adequately and get all the benefits from it. The writer feels this lack of knowledge, and wants to take advantage of being here to learn the technology and techniques for using integrated circuits.

A Circular Active Reflector Atenna (Cara), Energy Distribution Calculations, And An Experimental Test, Larry V. Knight, George H. Barry

Faculty Publications

Conventional high-frequency (HF) circular phased arrays, such as the Wullenweber circular array, have a cost factor that increases at a greater-than-square law rate as its radius is increased to produce larger apertures. A new method of forming simultaneous beams in an HF circular array has been proposed in which beams are formed in the space within the array from pickup element energy that has been amplified and reradiated. Such a device is called a circular active reflector antenna (CARA), and its cost increases at a substantially linear rate as its radius is increased to form larger apertures. This paper describes …

Electron Trajectories In The Vicinity Of A Wire Mesh Placed Parallel To A Perfectly Conducting Ground Plane, Donald E. Jones

Electrical and Computer Engineering ETDs

In the System Generated Electro-Magnetic Pulse (SGEMP) simulator, a flux of high energy photons are introduced into a vacuum chamber. These photons strike the walls of the chamber, producing compton electrons. As this effect is not present in the environment to be simulated, it is desirable to prevent these electrons from entering the working volume of the chamber.

Stresses At The Tips Of Cracks Emanating From The Loaded Fastener Hole, Venkataraman Shivakumar

Mechanical Engineering ETDs

Stress-intensity factors, K, are obtained at the tips of radial cracks emanating from the boundary of an internal circular fastener hole in a plate loaded by a pin or rivet that just fills the hole and is pulled in the negative y-direction, in the plane of the plate. Solutions are obtained in a conformally mapped region in the form of series for different crack lengths and are based on the Muskhelishvili formulation in the two-dimensional theory of elasticity. The method presents a general technique for determining K for k symmetrically located radial cracks of equal length for a wide variety …

The Design Of Optimal And Sub-Optimal Feedback Controllers For Discrete Systems, Chaw-Kwei Hung

Electrical and Computer Engineering ETDs

This dissertation is divided into two parts. The first part presents a method for the design of time-optimal feedback controllers for linear discrete stable systems with a single bounded input. In the second part, a method is presented for the design of time sub-optimal feedback controllers in which a tight upper bound on the time sub-optimal feedback controller's performance for state points in a convex polyhedron can be guaranteed. Two sets related to the reachable set--the zero control set and the cylindrical set--are formulated. Both are helpful in the realization of the time-optimal feedback controller. The cylindrical set is composed …

Hmo, A Hardware Microcode Optimizer, James O. Bondi, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Discusses an Algorithm for Optimizing the Density and Parallelism of Micro coded Routines in Micro programmable Machines. Besides the Algorithm itself, the Algorithm's Uses, Adaptability to Conventional Machine Characteristics, and Architectural Requirements Are Also Discussed and Analyzed. Even Though the Paper Proposes a Hardware Implementation of the Algorithm, the Algorithm is Viewed as an Integral Part of the Entire Microcode Generation and Usage Process, from Initial High-Level Input into a Software Microcode Compiler Down to Machine-Level Execution of the Resultant Microcode on the Host Machine. It is Believed that, by Removing Much of the Traditionally Time-Consuming and Machine-Dependent …

Instruction Design To Minimize Program Size, James F. Wade, Paul D. Stigall

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.