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Articles 50221 - 50250 of 53197
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On-Line Economic Optimization Of A Chemical Reactor, Jesse Daniel Bennett
On-Line Economic Optimization Of A Chemical Reactor, Jesse Daniel Bennett
Doctoral Dissertations
"An economic optimizing control system for a continuous flow stirred tank chemical reactor is designed, simulated, and installed on a pilot scale reactor. The control scheme utilizes a reaction and reactor model to predict on-line the economic optimum of a reactant concentration. In this manner the control system manipulates the reactant flow rate to maintain the optimum concentration during changes in reaction-reactor parameters with time. Typical parameter changes include the decay of reaction catalyst activity. The optimizing controller will function in conjunction with various operating policies including control to maintain a specified production rate"--Abstract, page ii.
Response Surface Study Of A Characteristic Chemical Plant, John Thomas Mason Iii
Response Surface Study Of A Characteristic Chemical Plant, John Thomas Mason Iii
Doctoral Dissertations
"Study of the return on investment response surface of a characteristic chemical plant indicates unimodality in the valid region, but the optimum design condition with this response surface is strongly affected by the correlation used for the investment. The method used for the design of this type of chemical plant incorporates the use of a simulation routine for preliminary estimates"--Abstract, page ii.
Structure And Properties Of Silver Borate Glasses, Edward Nashed Boulos
Structure And Properties Of Silver Borate Glasses, Edward Nashed Boulos
Doctoral Dissertations
"Clear glasses form in the system Ag₂O-B₂O₃ up to about 35 mol.% (65 wt.%) Ag₂O. Infrared absorption, thermal expansion and density data indicated an analogy to the Na₂O-B₂O₃ system. Pentaborate-triborate group pairs appear to be formed upon the addition of Ag₂O to B₂O₃ up to 20 mol.% Ag₂O and diborate groups from 20 to 33 mol.% Ag₂O. This interpretation is supported by the comparison of the infrared absorption spectra of quenched and crystallized glasses. One crystallization product ,Ag₂O.4B₂O₃, has been identified previously. A new compound starts to appear at 28 mol.% Ag₂O. Silver is generally present as a network modifier …
Transient Hydraulic Simulation: Breached Earth Dams, D. L. Fread
Transient Hydraulic Simulation: Breached Earth Dams, D. L. Fread
Doctoral Dissertations
"A conceptual method to alleviate flood damages due to over-topping failures of small earthfill dams is the incorporation of a relatively thin erosion retarding layer within the dam. This paper investigates the reduction in the reservoir release due to the hypothetical erosion retarding layer. In addition, the paper provides a method for the determination of an optimal location of the layer so as to minimize the maximum possible reservoir release due to a gradually breached earth dam. The transient reservoir flow is simulated by a numerical model, based upon the solution of the one-dimensional St. Venant unsteady open-channel flow equations. …
The Use Of Semiconductor Memories In Drug Dispensing, James John De Largy
The Use Of Semiconductor Memories In Drug Dispensing, James John De Largy
Masters Theses
"This paper presents the problems encountered and the methods used during the design of an electronic system to be an integral part of a medical drug dispensing machine. The system has a memory composed of both random access and read only memories to enable it to operate, along with many such machines , from one data input line. The system accepts information such as patient's name, social security number, and drug location number. It also provides signal drive to an attached printer in order to reproduce this information for use on the drug label. Finally, the system electronics accepts input …
A Step-Wise Gray Approximation Of The Radiative Absorption Coefficient For An Isothermal Hydrogen Plasma, Keith Harlan Browne
A Step-Wise Gray Approximation Of The Radiative Absorption Coefficient For An Isothermal Hydrogen Plasma, Keith Harlan Browne
Masters Theses
"The radiative absorption coefficient of an isothermal hydrogen plasma is calculated using a step-wise gray approximation. The approximation retains a high degree of accuracy while significantly reducing the numerical computer time. The accuracy of the approximation depends on the spacing of the steps taken in the frequency spectrum as well as the number or steps used; 135 steps are used in this study. Plasma conditions of interest in this study are for temperatures between 5000 and 60,000ºK, densities between 10⁻⁵ and 10⁻⁷ gm/cm³, and thicknesses between 0.1 and 100 cm. Flux and intensity calculations are made for each case using …
Feed Drive Design For Numerically Controlled Machine Tools, Subash Bhatia
Feed Drive Design For Numerically Controlled Machine Tools, Subash Bhatia
Masters Theses
"The various types of feed drive control systems used in numerical control of machine tools have been broadly classified. Further a step by step design has been presented for the feed drive of a numerical contouring control milling machine. The aim has been to develop a consistent strategy for tackling a variety of such problems. Consequently stress has been laid on principles and not on design figures"--Abstract, page ii.
Frequency Division Using Cascaded Phase-Locked Loops, Curtis B. Abshier
Frequency Division Using Cascaded Phase-Locked Loops, Curtis B. Abshier
Masters Theses
"In many practical communication systems it is necessary to generate phase coherent subharmonics of an input tone. A useful system for accomplishing this task is a system of phase-locked loops in cascade. It is shown that when the feed-forward function is matched, the phase error of the second loop is zero. Analytical analysis and computer simulation prove that the minimum time to achieve phase-lock is obtained when the feed-forward function is matched. Under this condition, necessary design parameters are determined with ease"--Abstract, page i.
An Analysis Of Solar Noise Outbursts And Their Application To Space Communication, Marion Francis Moen
An Analysis Of Solar Noise Outbursts And Their Application To Space Communication, Marion Francis Moen
Masters Theses
"A relationship between sunspot activity, solar flare activity and noise outbursts is presented. Five different types of interference radiation in the 10MHz to 30,000 MHz frequency band are discussed. Data obtained by solar radio astronomy are analyzed to determine the extent of solar noise outbursts as a function of sunspot activity. An application of the burst data to future space communication is given"--Abstract, page ii.
Design Of A Quadrature Envelope And Correlating Receiver, Clinton Harold Moor
Design Of A Quadrature Envelope And Correlating Receiver, Clinton Harold Moor
Masters Theses
"A receiver design analysis and rationale is presented. The receiver is capable of performing in an instrumentation role for propagation experiments conducted in the field. The data gathered during the field tests will be used to determine the complex impulse response of the ground-to-ground communications channel and to evaluate the performance of a candidate ranging waveform in this channel. The receiver is capable of operation in either the propagation mode or the ranging mode and each mode of operation can be performed on either a UHF band frequency or an L-Band frequency. During the propagation mode the receiver serves as …
Simulation Of Digital Computer Simcom, Ming-Te Hsieh
Simulation Of Digital Computer Simcom, Ming-Te Hsieh
Masters Theses
"SIMCOM(SIMulated COMputer) is a hypothetical small general-purpose digital computer. It has a core memory of 4096 12-bit words and has been modeled after the Scientific Control Corporation SCC 650. The instructions of SIMCOM are completely compatible with the SCC 650, any SIMCOM program can be run on the SCC 650. The logical organization is similar but not identical to the SCC 650, the mnemonics that are used to represent all instructions are identical to those used on the SCC 650 except the Input/Output instructions. This computer can be simulated on any available commercial computer. If such a simulation is available, …
A Time And Frequency Domain Approach To The Optimization Of Linear Multivariable Regulators, Eugene Charles Machacek
A Time And Frequency Domain Approach To The Optimization Of Linear Multivariable Regulators, Eugene Charles Machacek
Masters Theses
"Optimal design and analysis of a multivariable regulator may be achieved in either the frequency or time domain. This paper describes the formulation of the matrix Riccati equation in the time domain and the Wiener-Hopf equation and the root-square-locus in the frequency domain. The necessary requirements which must be satisfied in order to achieve an optimal control vector when using a quadratic performance index are presented for both domains. The resultant optimal control vector is shown to be a linear function of the system state vector. The effect of the quadratic performance index weighting matrices on the optimal system closed-loop …
An Analog Computer Simulation Of The Flapping Of A Helicopter Hinged Main Rotor Blade, Edward Charles Robinson
An Analog Computer Simulation Of The Flapping Of A Helicopter Hinged Main Rotor Blade, Edward Charles Robinson
Masters Theses
"An analog computer simulation was performed on the Systron Donner SD 40/80 electronic differential analyzer consisting of one panel (SD 40) less three modules augmented by three digital logic modules for iterative operation. The flapping equation was solved in continuous iteration for various values of blade mass and the resultant blade flapping magnitudes and harmonic coefficients were compared in computer plots of the blade tip path plane. A flap compensator was added and the result plotted. Various aerodynamic parameters of the flapping equation solution were plotted"--Abstract, page ii.
A Computerized Decision Model For Making Quantitative Decisions With Regards To The Department Of Army's Equipment Improvement Recommendations, Lewis Neri
Masters Theses
"The management decision technique, currently in use, of determining priority of EIR evaluation is basically that of "feel and experience" along with the "most pressure" applied from outside the responsible organization. The feasibility of a computerized management decision concept has been studied at the lowest system with the objective of applying this to the next higher systems and finally arriving at an overall system value to obtain system priority. This study develops the technology of operations research and the associated computer techniques, delineates the problem and develops a mathematical model to simulate this management decision technique. Furthermore, it utilizes logical …
The Effect Of Channel Errors In The Differential Pulse-Code-Modulation Transmission Of Sampled Imagery, Roger J. Arguello, Harvey R. Sellner, John A. Stuller
The Effect Of Channel Errors In The Differential Pulse-Code-Modulation Transmission Of Sampled Imagery, Roger J. Arguello, Harvey R. Sellner, John A. Stuller
Electrical and Computer Engineering Faculty Research & Creative Works
This Paper Presents an Analysis, Simulation, and Discussion of the Effects of Communication Errors on Four-Bit Differential Pulse-Code Modulation (DPCM) Sampled Imagery. Simulations Are Presented that Describe the Effects of Inserting Periodic "PCM Updates" in Order to Correct Communication Errors in the DPCM Transmission of Photographic Scenes that Have Been Scanned and Sampled at the Nyquist Rate. Copyright © 1971 by the Institute of Electrical and Electronics Engineers, Inc.
Deriving Dc Machine Torque By The Principle Of Virtual Work, George Mcpherson
Deriving Dc Machine Torque By The Principle Of Virtual Work, George Mcpherson
Electrical and Computer Engineering Faculty Research & Creative Works
The purpose of this paper is to fill a gap which exists in the "textbook" theory of dc machines. The paper shows that the usual expression for dc machine torque can be obtained from the direct application of the principle of virtual work to the machine, making the traditional assumptions. The method provides additional benefits in that it demonstrates the reluctance torque which results from the saliency of the field structure and shows that compensating windings have no effect on the torque under the assumed linear conditions. Copyright © 1971 by The Institute of Electrical and Electronics Engineers, Inc.
A Comprehensive Investigation Of The Behavior Of Saturated Sands Subjected To Cyclic Triaxial Loadings., James Francis Kanipe
A Comprehensive Investigation Of The Behavior Of Saturated Sands Subjected To Cyclic Triaxial Loadings., James Francis Kanipe
Civil Engineering ETDs
Considerable interest in earthquake engineering has developed during the past decade. Due to the potential hazards involved in foundation failures of nuclear power plants, and because there is an increase in the demand for earth dams throughout the world together with a decrease in desirable sites, it has become imperative that reliable techniques be developed to predict the response of soils to earthquake induced forces. As an integral part of such an endeavor, this research program was directed toward the identification of the various factors which significantly influence the development of pore pressure in saturated sands subjected to cyclic stress …
Thermal Expansion Of Tungsten At Low Temperatures, Jayant S. Shah, Martin E. Straumanis
Thermal Expansion Of Tungsten At Low Temperatures, Jayant S. Shah, Martin E. Straumanis
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
Diffusion In Wide Grain Boundaries, J. Mimkes, Manfred Wuttig
Diffusion In Wide Grain Boundaries, J. Mimkes, Manfred Wuttig
Materials Science and Engineering Faculty Research & Creative Works
The rigorous solution of the grain-boundary diffusion problem has been approximated by a series expansion method. The calculations show that higher-order terms may be neglected in the bulk adjacent to the grain boundary. Thus, in this region Whipple's and Suzuoka's solutions represent a close approximation to the problem. Inside the grain boundary, however, higher-order approximations have to be taken into account. These approximations gain importance in the case of wide grain boundaries. The solutions obtained for an instantaneous source have been fitted to available grain-boundary diffusion data of Ni2+ in MgO at 1200°C. Numerical calculations give for the bulk diffusion …
Rotating Cylinder Apparatus For Rarefied Gas Flow Studies, Darryl J. Alofs, George S. Springer
Rotating Cylinder Apparatus For Rarefied Gas Flow Studies, Darryl J. Alofs, George S. Springer
Mechanical and Aerospace Engineering Faculty Research & Creative Works
A Rotating Cylinder Type Apparatus is Described, Suitable for Determining Drag in Cylindrical Couette Flow of Rarefied Gases, and for Evaluating Tangential Momentum Accommodation Coefficients at Gas-Solid Boundaries. the Apparatus is Equipped with a Damping Device using Diffusion Pump Oil for Eliminating Undesirable Oscillations in the System. Tangential Momentum Accommodation Coefficients of Argon on Aluminum Were Determined with an Accuracy of ±2.5%. the Results Obtained Indicate that the Apparatus May Be Used over a Wide Pressure Range, Corresponding to Free Molecule and Continuum Flow Conditions. © 1970 the American Institute of Physics.
Phase Equilibria And Thermodynamic Studies In The System Cao-Feo-Fe2o3-Sio2, M. Timucin, Arthur E. Morris
Phase Equilibria And Thermodynamic Studies In The System Cao-Feo-Fe2o3-Sio2, M. Timucin, Arthur E. Morris
Materials Science and Engineering Faculty Research & Creative Works
Phase equilibria and thermodynamic properties of the system CaO-FeO-Fe2O3-SiO2 were studied at 1450° and 1550°C, over a range of pO2 from 1 to about 10-11 atm. Isothermal phase diagrams and activity-composition diagrams were constructed for 0, 5, 10, 20, and 30 wt pct SiO2 sections. The data are applicable to further understanding the behavior of simple BOF steelmaking slags. © 1970 The Minerals, Metals & Materials Society - ASM International - The Materials Information Society.
Low Cost Housing (How To Avoid The “Problem” In Three Words Or Less), Carl P. D. Sharpe
Low Cost Housing (How To Avoid The “Problem” In Three Words Or Less), Carl P. D. Sharpe
International Symposia on Low Cost Housing Problems
No abstract provided.
Cultural Bases Of Preference For The Visual Appearance Of Residential Environments, Peter G. Flachsbart, George L. Peterson
Cultural Bases Of Preference For The Visual Appearance Of Residential Environments, Peter G. Flachsbart, George L. Peterson
International Symposia on Low Cost Housing Problems
No abstract provided.
Feasibility Of Prefabrication In Low Cost Housing, Dogan Sorguc, David Arditti, Taha Aksoy
Feasibility Of Prefabrication In Low Cost Housing, Dogan Sorguc, David Arditti, Taha Aksoy
International Symposia on Low Cost Housing Problems
No abstract provided.
A Case Study In Industrialized Housing, William L. Hooper
A Case Study In Industrialized Housing, William L. Hooper
International Symposia on Low Cost Housing Problems
No abstract provided.
Shelly-Modular Housing System, Luis E. Mora
Shelly-Modular Housing System, Luis E. Mora
International Symposia on Low Cost Housing Problems
No abstract provided.
Low Cost Housing: The Necessity Of Interdisciplinary Skills, Margaret K. Thorpe, Dwight D. Zeck
Low Cost Housing: The Necessity Of Interdisciplinary Skills, Margaret K. Thorpe, Dwight D. Zeck
International Symposia on Low Cost Housing Problems
No abstract provided.
New Towns, Leonard R. Mann
New Towns, Leonard R. Mann
International Symposia on Low Cost Housing Problems
No abstract provided.
Low Cost Housing In Europe, Sydney Lenssen
Low Cost Housing In Europe, Sydney Lenssen
International Symposia on Low Cost Housing Problems
No abstract provided.
Industrialization: Generic Examples, Specific Solutions -- Camus And Sectra, Laurence S. Cutler
Industrialization: Generic Examples, Specific Solutions -- Camus And Sectra, Laurence S. Cutler
International Symposia on Low Cost Housing Problems
No abstract provided.