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Articles 19261 - 19290 of 21792
Full-Text Articles in Engineering
Identification Of Linear Systems With Delay Via A Learning Model, Hugh Francis Spence
Identification Of Linear Systems With Delay Via A Learning Model, Hugh Francis Spence
Doctoral Dissertations
"The effects of input delay on an identification scheme using a learning model are investigated. The parameter adjustment laws for the learning model are derived through Lyapunov methods similar to those used for the model reference adaptive control systems of Parks. For no measurement noise or delay mismatch between the learning model and system, the parameters are adjusted to bring the error between model and plant to zero. When there is delay mismatch between the inputs of the learning model and the unknown system, the convergence of the parameters of the learning model to those of the unknown system is …
Dynamic Behavior Of Eccentrically Stiffened Plates, Charles Stuart Ferrell
Dynamic Behavior Of Eccentrically Stiffened Plates, Charles Stuart Ferrell
Doctoral Dissertations
"The dynamic behavior of eccentrically stiffened rectangular plates is studied by the finite element method. The addition of stiffeners to a plate structure is a common method of increasing the rigidity of the structure with a minimum of weight increase. However, this stiffened plate configuration does not easily lend itself to analysis. This study is an approach to finding a rational method by which the dynamic behavior of such a stiffened plate structure may be determined. The governing differential equations for the finite element model are derived and the stiffness and mass matrices for the plate and stiffener elements are …
A Study Of Early-Late Type S0-Pcm Signal Bit Synchronizers, Kuang-Cheng Hu
A Study Of Early-Late Type S0-Pcm Signal Bit Synchronizers, Kuang-Cheng Hu
Masters Theses
"The steady-state phase noise performances of an absolute value type and a squaring loop type of early-late gate S0-PCM signal bit synchronizers are developed using the Fokker-Planck method. The results are compared on the basis of the performance of two configurations with equal loop bandwidth at each input signal-to-noise ratio Rs. The probabilities of bit-detection error of the two configurations are compared. These comparisons are made as a function of Rs. The absolute value type of early-late gate S0-PCM signal bit synchronizater yields better performance than that of the squaring loop type of early-late gate S0-PCM …
Reservoir Design: Simulation Techniques, Larry W. Mays
Reservoir Design: Simulation Techniques, Larry W. Mays
Masters Theses
"A simulation model is developed to aid in the analysis of small dams to reduce the possibility of inadequate spillway designs. Basic assumptions concerning the geometric aspects of the natural reservoir are made to develop the model which is based upon describing the timing and magnitude of a design flood passing through a reservoir. Simulation equations are derived from the basic continuity equation and describe reservoir outflow and storage as functions of reservoir depth. Newton's Iteration Technique is utilized to solve the simulation equations for the reservoir depth. The resulting simulation model determines an optimum size auxiliary spillway having a …
An Energy Solution For Vibration Characteristics Of Free Thin Cylinders, Dale Elmer Leanhardt
An Energy Solution For Vibration Characteristics Of Free Thin Cylinders, Dale Elmer Leanhardt
Masters Theses
"In this report the flexural vibrations of the walls of free, thin, circular cylinders are considered. Theoretical expressions are developed for the natural frequencies by extending the approximate energy method of Arnold and Warburton to the free-free case. Furthermore, the developed expressions are shown to apply, as special cases, to the fixed-fixed and simply-supported cylinders analyzed by Arnold and Warburton. The energy solution for free-free cylinders is checked both experimentally using a 3500 pound-force, 5 to 2000 hertz, vibration exciter and numerically using the well documented SABOR IV-DYNAL finite element program. While the derived energy method accounts for any prescribed …
Calculation Of Eddy Current Loss Of A Disc, Kou Quen Chang
Calculation Of Eddy Current Loss Of A Disc, Kou Quen Chang
Masters Theses
"A method is presented to calculate the eddy current losses of a uniform disc with an opening in the center and excited by a circular current loopage First, the disc is subdivided into smaller concentric rings, then the self-inductances, the mutual inductances between these smaller rings, the mutual inductances between the excitation coil and the smaller rings, and the resistance of the rings are calculated. Next, the eddy current flowing in each ring is obtained by solving a complex matrix equation of the form [X] [I] = [V] where X is the impedance matrix, I is the eddy current matrix, …
Factors Affecting The Ductility And Microstructure Of Ti-6al-6v-2sn Titanium Alloy Weldments, Michael John Ball
Factors Affecting The Ductility And Microstructure Of Ti-6al-6v-2sn Titanium Alloy Weldments, Michael John Ball
Masters Theses
"The purpose of the investigation was to study the effect of material thickness, weld heat input and post weld heat treatment on the tensile properties and microstructure of Ti-6Al-6V-2Sn Titanium, and obtain a practical weld/thermal treatment cycle. The objectives were accomplished by electron beam and gas tungsten arc welding 0.060, 0.125 and 0.250 inch thick material and then heat treating at various temperatures and times. Electron beam and gas tungsten arc welding enabled an approximate 4:1 ratio of heat inputs to be utilized. Resultant welded and heat treated material was tensile tested and metallographically examined. Heat treatments involved both air …
Radiant Interchange In A Non-Isothermal Rectangular Cavity, Tilak Raj Sawheny
Radiant Interchange In A Non-Isothermal Rectangular Cavity, Tilak Raj Sawheny
Masters Theses
"Radiant interchange between non-isothermal, gray diffuse surfaces with non-uniform radiosity has been determined for a rectangular cavity. Temperature distribution and heat flux as thermal specifications for the parallel surfaces of the cavity have been considered separately. Ambarzumian's method has been used for the first time to solve a radiant interchange problem. According to the method, the integral equation for the radiosity is first transformed into an integro-differential equation and then into a system of ordinary differential equations. Initial conditions required to solve the differential equations are the H-functions. The H-functions represent the radiosity at the edge of the cavity for …
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 …
Low Frequency Lumped Element Directional Couplers, Constantine Rodolph Jenkins
Low Frequency Lumped Element Directional Couplers, Constantine Rodolph Jenkins
Masters Theses
"Lumped element directional couplers are desirable at frequencies below the VHF range because they eliminate the large physical size necessary for the distributed element directional couplers. The purpose of this work is to describe the theory and design of such low frequency lumped element directional couplers. A model for the coupler is developed and the equations which describe it are derived. Scattering matrices for one and two section couplers are obtained. Computer solutions for three section couplers are presented. Experimental results for one, two, and three section couplers are presented and comparison with theory are made. Comparisons of theoretical and …
Activation Volumes Of Carbon Diffusion In F.C.C. Iron-Nickel Alloys, James Raymond Keiser
Activation Volumes Of Carbon Diffusion In F.C.C. Iron-Nickel Alloys, James Raymond Keiser
Doctoral Dissertations
"The disaccommodation technique was used to determine the activation volume of carbon diffusion, ΔV, in six fcc iron-nickel alloys. Measurements were made at temperatures ranging from 68ºC to 90ºC and pressures up to six kilobars on samples having a nickel content between 31 and 63 at. %. A maximum activation volume of 3.9 cm³/mole was found at 34 at. % nickel. The compositional dependence of ΔV is satisfactorily reproduced by a magnetic energy continuum model in which it is assumed that the activation free energy of diffusion is essentially ferromagnetic in origin "--Abstract, page iii.
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 …
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 …
A Comparison Of Computer Codes For Fast Neutron Dosimetry By The Foil Technique, Jau Wen Chen
A Comparison Of Computer Codes For Fast Neutron Dosimetry By The Foil Technique, Jau Wen Chen
Masters Theses
"A comparison of the major codes currently used for fast neutron dosimetry based on the foil technique has been made. These codes are SAND II, SPECTRA and RDMM. The comparison is based upon the deviation of calculated from-measured activities, the input data decks, the obtained information, and the computer time required. Four sets of data were used to be compared upon the above four viewpoints, the conclusion reached is that the SPECTRA computer code is the most satisfactory for the UMR Reactor fast neutron spectrum"--Abstract, page ii.
The Design And Experimental Investigation Of A Hybrid Phase-Lock Loop, Srinivasa H. R. Raghavan
The Design And Experimental Investigation Of A Hybrid Phase-Lock Loop, Srinivasa H. R. Raghavan
Masters Theses
"This thesis describes the design and the laboratory implementation of a hybrid phase-lock loopage The step-by-step procedure followed in developing this experimental hybrid phase-lock loop, and its optimization with respect to various parameters are given. In regard to the performance characteristics, the loop was used to obtain the phase estimate of a split-phase modulated signal. The phase error probability density function was measured under various input noise conditions and these results are included and compared with previously published theoretical results"--Abstract, page ii.
Design And Preliminary Testing Of A Thermomechanical Rock Fragmentation Apparatus, Gary Earl Fenton
Design And Preliminary Testing Of A Thermomechanical Rock Fragmentation Apparatus, Gary Earl Fenton
Masters Theses
"The design characteristics of equipment to thermally weaken and mechanically fragment hard rock were developed and the apparatus constructed. An initial investigation of thermo-mechanical fragmentation was conducted on Missouri red granite. The particles from the fragmentation tests were sized and this analysis was used in the Rittinger theory to calculate surface area breakage energy. It was found that the application of thermal energy could reduce the surface area breakage energy per unit volume of material removed by as much as 41 percent. The use of kerfs in the rock increased the amount of material removed and permitted larger particles to …
Characteristics Of And Suggested Improvements In Communication Laboratory Equipment At University Of Missouri-Rolla, William Edgar Abernathie
Characteristics Of And Suggested Improvements In Communication Laboratory Equipment At University Of Missouri-Rolla, William Edgar Abernathie
Masters Theses
"This paper documents characteristics of and suggests improvements in Communication Laboratory Equipment built at the University of Missouri at Rolla. Included are Voltage Controlled Oscillators, Discriminators, Operational Amplifiers, and Multipliers. The graduate and undergraduate laboratory student thus has available equipment characteristics and, when building higher performance equipment, improvement suggestions"--Abstract, page ii.
The Pm3m-Fm3m Transformation And Phase Equilibrium In Solid Solutions Of Csc1 With Kc1, Rbc1, And Csbr, John David Weyand
The Pm3m-Fm3m Transformation And Phase Equilibrium In Solid Solutions Of Csc1 With Kc1, Rbc1, And Csbr, John David Weyand
Masters Theses
"Thermal expansion and the Pm3m t Fm3m transition of cesium chloride have been studied with high temperature diffractometry, differential thermal analysis, and heating and quenching techniques. The onset temperature of the transition in pure CsCl, on heating, is 471ºC. There are no observable premonitory effects below the transition temperature and no apparent structural relationships between the polymorphs is apparent. Both phases coexist over a 20º to 50ºC temperature range and equilibrium thermal hysteresis occurs on heating and cooling. Hysteresis behavior is explained by addition of strain energy parameters to the free energy function. Initiation of the Pm3m t Fm3m transformation …
The Genesis Of Cellular Precipitation In Copper Rich Copper-Indium Alloys, Raymond Albert Fournelle
The Genesis Of Cellular Precipitation In Copper Rich Copper-Indium Alloys, Raymond Albert Fournelle
Doctoral Dissertations
"The morphology of cellular precipitation in a Cu-9.5at.%In alloy has been investigated by light and electron microscopy and x-ray and electron diffraction. Both cellular and general precipitation were observed to occur simultaneously in quenched and aged alloys while only cellular precipitation was observed to occur in isothermally aged alloys. Because of the presence of wide, vacancy depleted precipitate free zones in the vicinity of grain boundaries, general precipitation was observed to have no effect on the early development of cellular precipitation. Hence, the early development of cellular precipitation was found to be identical for both types of heat treatment. By …
Thermal Lattice Expansion Of Various Types Of Solids, Jayantkumar Shantilal Shah
Thermal Lattice Expansion Of Various Types Of Solids, Jayantkumar Shantilal Shah
Doctoral Dissertations
"Thermal lattice expansion studies of various types of solids were carried out in this investigation and were corelated to their crystallographic and various other properties. The advantages and limitations of various methods of studying thermal expansion are discussed in detail. A new design for a versatile low temperature camera to study expansion by an X-ray method is proposed. The thermal lattice expansion of silicon was negative below 119ºK. This behavior is discussed in terms of crystal structure and interatomic bonding. Diamond exhibits no anomalous thermal expansion. Lattice parameter data for many metals at low temperatures are reported for the first …
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. …
X-Ray And Neutron Diffraction Study Of The Holmium-Iron System, Michael Fred Simmons
X-Ray And Neutron Diffraction Study Of The Holmium-Iron System, Michael Fred Simmons
Doctoral Dissertations
"Neutron diffraction and x-ray powder studies have been made of holmium-iron intermetallic compounds. The magnetic moments of Ho and Fe are in good agreement with measured spontaneous magnetization assuming a ferrimagnetic model with the Ho moments antiparallel to the Fe moments. The magnetic moments of the Fe atoms are found to be localized and thus independent of the rare earth content in the alloys. In contrast to HoCo₃, (00ℓ) type magnetic peaks in the neutron diffraction patterns are still prevalent at room temperature and gradually decrease as the Curie temperature is approached. This fact indicates that the easy direction of …
Sufficiency Conditions For Constrained Optima, Ju-Chang Huang, Robert M. Wellek
Sufficiency Conditions For Constrained Optima, Ju-Chang Huang, Robert M. Wellek
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Sufficiency conditions for constrained optimization problems were derived by the use of constrained second total derivatives. The results are in a simpler form than the Schechter and Beveridge relation. The sufficiency conditions of Phipps were corrected. © 1971, American Chemical Society. All rights reserved.
Maximum-Distance Linear Codes, Gary K. Maki, James H. Tracey
Maximum-Distance Linear Codes, Gary K. Maki, James H. Tracey
Electrical and Computer Engineering Faculty Research & Creative Works
Described here is a linear code that has a maximum distance between codewords of k for a code of order 2k. Since the minimum-maximum distance is k for a code of order 2k, a class of minimum-maximum distance codes results. For an (n,k) linear code, k ≤ n ≤ k + k∣2 for k even and k ≤ n ≤ k + (k - 1)/2 for k odd. Maximum-distance codes are found useful in encoding the states of sequential circuits. © 1971, IEEE. All rights reserved.
A State Assignment Procedure For Asynchronous Sequential Circuits, Gary K. Maki, James H. Tracey
A State Assignment Procedure For Asynchronous Sequential Circuits, Gary K. Maki, James H. Tracey
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a new procedure for constructing nonuniversal shared-row internal state assignments for asynchronous sequential circuits. The method consists basically of establishing an initial code with the minimum number of variables required to dis. © 1971, IEEE. All rights reserved.
Magnetic Properties Of Ceramic Ferrites Developed For Use In Fractional Horse Power A.C. Motors, Ram Saran Bhatia
Magnetic Properties Of Ceramic Ferrites Developed For Use In Fractional Horse Power A.C. Motors, Ram Saran Bhatia
Masters Theses
"The ceramic material produced in the Ceramic Engineering Department of the University of Missouri-Rolla has been tested to determine its magnetic properties. First the B-H characteristic, Q-factor and initial permeability were measured at different frequencies and the relative-loss factor was determined from the above results. The samples prepared were in the shape of toroids of approximately 8.0 cm of mean length and were wound with standard insulated number 38 wire. The soft ferrite material was produced to determine whether or not it could be used in the design of fractional H.P. a.c. motors"--Abstract, page ii.
Intrinsic Viscosities Of Linear Polyethylene, Joseph Shing Chiang
Intrinsic Viscosities Of Linear Polyethylene, Joseph Shing Chiang
Masters Theses
"Intrinsic viscosity measurements were performed on linear polyethylene (Marlex 6009) in decalin at 135ºC and in diphenyl ether at 163.9ºC. Molecular weights ranging from 3x10³ to 35x10⁴ were studied. It was found that for linear polyethylene of molecular weight up to 35x10⁴, the tedious intrinsic viscosity measurement could be replaced by inherent viscosity measurement at a concentration of 0.1 grams per deciliter. The effect of shear on viscosities measured in decalin increased as the molecular weight of the sample increased. The shear rate effects on intrinsic viscosities were negligible. On the other hand, the shear rate effect on the Huggins' …
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.
A Driver-Assisting Control System, Roger Allen Hayes
A Driver-Assisting Control System, Roger Allen Hayes
Masters Theses
"The material presented here explains the electronics of a magnetic guidance control system. The system is based on magnets embedded in the center of the roadway. If a vehicle passes near a magnet, fluxgate magnetometers sense the presence of the magnets and guidance pulses are developed and processed. The end result is a visual output which indicates the direction the driver must steer the vehicle for proper positioning on the roadway. The paper presents a solution to the detection problem caused by the sensor output being a function of the earth's field as well as the field of the guidance …
Stability And Synthesis Of Transfer Functions Rational In W = E To The Power Of The Square Root Of T (S² + Bs + C) And Omega = The Square Root Of T (S² + Bs + C), James Fred Archer
Stability And Synthesis Of Transfer Functions Rational In W = E To The Power Of The Square Root Of T (S² + Bs + C) And Omega = The Square Root Of T (S² + Bs + C), James Fred Archer
Masters Theses
"The bounded input-bounded output stability is investigated for networks containing uniformly distributed LRGC, LRC, GRC and G(ω)RC elements. The region of stability in the W plane (W = e to the power of the square root of (s² + bs + c), Θ plane (Θ = the square root of (s² + bs + c), and S plane (S = s²+bs+c) is found in each case so that if the poles of a transfer function rational in W, Θ or S lie within this region the system is stable. After obtaining a desired transfer function rational in W = e …