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Articles 2491 - 2520 of 3914
Full-Text Articles in Engineering
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.
The Influence Of Temperature, Carbon Content, And Preloading On Secondary Consolidation Of A Clay, Richard Kai-Ming So
The Influence Of Temperature, Carbon Content, And Preloading On Secondary Consolidation Of A Clay, Richard Kai-Ming So
Masters Theses
"The effect of temperature, organic carbon content, and preloading on secondary consolidation of Bryce clay has been studied. A straight line plot of void ratio versus logarithm of time was established in secondary consolidation for long term loading periods up to one month. Temperature changes within the range of 5ºC. to 45ºC. were studied in the secondary consolidation phase at different stress levels and different carbon contents of the soil. Secondary consolidation in a preloading cycle at a stress level of 2 tsf unloaded to 1 tsf and reloaded to 2 tsf was studied. The preloading tests were at temperatures …
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' …
The Influence Of Member Length On Thermal Contact Resistance In A Vacuum Environment, Larry Martin Cooper
The Influence Of Member Length On Thermal Contact Resistance In A Vacuum Environment, Larry Martin Cooper
Masters Theses
"An investigation was conducted to determine the influence of member length on thermal contact resistance in a vacuum environment. A model was created which consisted of a center rod axially loaded between two other members. It was assumed that circular macroscopic constriction areas were formed at the contact interface when the rods were loaded. Macroscopic modeling of the contact surfaces makes the thermal contact analysis a function of the mechanical and thermal boundary conditions of the total body. The method of finite differences was employed to calculate the temperature distribution, heat flows, and thermal contact resistance of each member. Data …
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.
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 …
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.
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 …
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.
A Study Of The Dislocation Instability And Reverse Martensitic Transformation In Fe-Ni System, Chung Lim
A Study Of The Dislocation Instability And Reverse Martensitic Transformation In Fe-Ni System, Chung Lim
Masters Theses
"Since the martensitic reaction is a strain transformation, the transformation of the lattice structure can be induced by an external stresses. This also means that the macroscopic total elastic constant should decrease as the temperature is lowered to Ms on cooling. For the reverse transformation an anomalous decrease of the elastic constant is to be expected as the temperature increases to As on heating. In this experiment measurements of the velocity change of an ultrasonic wave in Fe-Ni alloys were carried out for the reverse martensitic transformation. The deviation from the linear relationship of the velocity change as …
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 …
A Comparative Study Of Experimental And Computed Compressibility Factors Of Methane - Nitrogen - Helium System, Promod Kumar Taneja
A Comparative Study Of Experimental And Computed Compressibility Factors Of Methane - Nitrogen - Helium System, Promod Kumar Taneja
Masters Theses
"The volumetric data for methane, nitrogen, and helium mixtures have been determined experimentally at low temperatures (60ºF to -30ºF) over a pressure range of 1000 to 5000 psig. An attempt has been made to show that the extension of standard techniques viz, "The Law of Corresponding States" for predicting the compressibility factors of pure hydrocarbons and hydrocarbon mixtures is not adequate for mixtures containing even very small amounts of helium. The deviation from the computed compressibility factors is found to be maximum at low temperatures and high pressures (up to 22%) for the mixtures studied"--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 …
Synthesis Of Active Distributed Rc Networks Via The W=E[Superscript Square Root Of S] Transmission, Roy Dale Hensley
Synthesis Of Active Distributed Rc Networks Via The W=E[Superscript Square Root Of S] Transmission, Roy Dale Hensley
Masters Theses
"The material presented here provides a means for synthesis of networks containing uniformly distributed RC elements. After transforming the desired transfer function into a function rational in W = e[superscript square root of sRC] , state-variable synthesis methods are applied to obtain a model containing elements with transfer functions of the form 1/W. A circuit is then presented for the 1/W block along with error analysis and design procedures for use in construction of the model. The elements of the synthesis procedures of Wyndrum and O'Shea are presented for comparison. Furthermore, synthesis of functions rational in W and Θ = …
Ladder Network Transfer Function Characteristics, Thomtavanit Hatayodom
Ladder Network Transfer Function Characteristics, Thomtavanit Hatayodom
Masters Theses
"This thesis investigates the network characteristics and synthesis procedure previously developed. As a result of this investigation, location of the absolute minimum values of Navot's method is determined; a procedure is given for obtaining more desirable component values for a given ladder network without changing its transfer function; a procedure is given for obtaining the source location in a ladder network that yields the desired numerator degree of its transfer function; and a computer program for helping to obtain the above result is presented"--Abstract, page ii.
A Study Of A Nitrogen Heat Pipe, Jay Dudheker
A Study Of A Nitrogen Heat Pipe, Jay Dudheker
Masters Theses
"An experimental heat pipe, 33.25 inches long and 0.75 inches in diameter, with modacrylic fiber wick and liquid nitrogen as its working fluid was constructed to study the operating characteristics of a cryogenic heat pipe. The effective thermal conductivity and the axial temperature distribution were determined for various levels of power input. The effect of inclination angle on the above parameters was also measured"--Abstract, page ii.
The Design Of A Data Set Interface, Wayne Everett Omohundro
The Design Of A Data Set Interface, Wayne Everett Omohundro
Masters Theses
"This paper describes the data set interface which connects the SCC-650 digital computer to the IBM-360 computer by means of a data communications link over a telephone line. To provide the necessary background information, the basic concepts and techniques of digital data communications are discussed. In conjunction with these concepts, several possible system arrangements of modems, terminals, and computers are given. Also two computer-to-computer networks are discussed. The first one is the system used at the Lawrence Radiation Laboratory for the acquisition of experimental data. The second system, the one in which the interface operates, is the data communications system …
Development Of A Set Of Optimum Synchronization Codes For A Unique Decoder Mechanization, Irv D. Siegel
Development Of A Set Of Optimum Synchronization Codes For A Unique Decoder Mechanization, Irv D. Siegel
Masters Theses
"Synchronization requirements are specified for and a unique decoder mechanization is associated with a particular communication system. Optimum synchronization codes, defined as codes which are the least susceptible to false synchronization indications, are sought. Existing sets of optimum codes are investigated for applicability. This Thesis shows how these sets were developed from selected criteria and demonstrates why their theoretical nature produces unsatisfactory results in the present application wherein all parameters are known. A computer program was written to examine code pattern performance in the specified decoder under actual operating conditions. From an analysis of the results, a recommended set of …
The Design Of A Lightning Data Interface, Larry Lee Hosto
The Design Of A Lightning Data Interface, Larry Lee Hosto
Masters Theses
"A system for the processing of lightning stroke location data has been designed. The system will be used for studying the correlation of lightning and thunderstorm precipitation. The lightning stroke location system has been developed to gain further information about the cause-effect relationship between lightning stroke activity and thunderstorm precipitation. The system will consist of an analog computational network to find the tangent of the azimuth of the lightning stroke, an analog-to-digital converter, and a computer program which will process and store data on magnetic tape. This paper will discuss the design of the analog computational network and the computer …
Evaluation Of A Cation Isotopic Substitution Technique In Conjunction With A High Temperature Gas Pycnometer For Determining The Stoichiometry Of Materials, Michael Clair Graves
Evaluation Of A Cation Isotopic Substitution Technique In Conjunction With A High Temperature Gas Pycnometer For Determining The Stoichiometry Of Materials, Michael Clair Graves
Masters Theses
"This study was concerned with the evaluation of a high temperature gas pycnometer, used in conjunction with a cation isotopic substitution technique, for determining the stoichiometry of materials. Three methods were investigated for determining the correction factors for the thermal gradient effects in the gas pycnometer. The correction factors were shown to be dependent on the temperature, the sample volume, and the height of the sample in the sample chamber. Under the conditions of these experiments, the correction factors were shown to be essentially independent of sample grain size and pycnometer atmosphere. The determination of the stoichiometry of cadmium oxide …
A Triangular Element For Numerical Solutions Of Axisymmetric Conduction Problems In Cylindrical Coordinates, Prafulla Chandra Mahata
A Triangular Element For Numerical Solutions Of Axisymmetric Conduction Problems In Cylindrical Coordinates, Prafulla Chandra Mahata
Masters Theses
"The triangular element is one of the many suitable elements which are used in finite difference methods as applied to conduction heat transfer. Such elements find many applications in conduction problems in Cartesian coordinates. This work proposes a new triangular element for axisymmetric conduction problems in cylindrical coordinates. The validity and workability of the networks formed by the proposed triangular elements are strengthened by selected examples. The work is completed by the application of the triangular element to an industrial problem having irregular boundaries. The results are compared with the solution obtained by the finite element method"--Abstract, page ii.
Thickening And Dewatering Characteristics Of Activated Sludge Containing Metal-Precipitated Phosphorus, Lyle Wayne Merritt
Thickening And Dewatering Characteristics Of Activated Sludge Containing Metal-Precipitated Phosphorus, Lyle Wayne Merritt
Masters Theses
"The purpose of this research study was to investigate methods for the disposal of activated sludge containing metal-precipitated phosphorus. To accomplish this objective, chemically-treated activated sludge or a mixture of the secondary sludge with primary sludge were thickened and dewatered by vacuum filtration and centrifugation. The putrescibility of the dewatered secondary sludge was also evaluated, and since anaerobic digestion is the usual method of sludge treatment, a digestion study was conducted. Secondary sludge for these studies was produced in five 38-gpd (144-1/day) activated sludge pilot plants operated at the Rolla Southeast Treatment Plant. Ferric chloride and alum were added directly …
The Integrated Planning Method Of Project Planning, Development And Implementation, Joseph Frank Lynch
The Integrated Planning Method Of Project Planning, Development And Implementation, Joseph Frank Lynch
Masters Theses
"Present comprehensive planning endeavors lack a consistent methodology which will produce realistic, useable results. The validity of this statement should be obvious after one has read Miller's "Evaluation of City and Region Planning Techniques." This paper contains a methodology, "The Integrated Planning Method," which will go a long way toward correcting this gross inadequacy that planners presently encounter in directing planning efforts. Two government developed planning and analysis procedures that, up until this time have been applied almost exclusively to hardware systems, have been combined into one integrated planning methodology that will provide not only meaningful and rigorous definition and …
A Method For Studying Sequential Faults On A Three Phase Distribution Transformer, Shashi Kant Pandey
A Method For Studying Sequential Faults On A Three Phase Distribution Transformer, Shashi Kant Pandey
Masters Theses
"A method has been presented for studying sequential faults on opposite sides of a three-phase distribution transformer using the theory of symmetrical components and Alpha, Beta, and Zero components of three-phase systems. The effect of the faults on the distribution system has also been analyzed and improvements in the protection scheme suggested. The sequential faults occurred, one after the other, on the distribution system of the Central Electric Power Cooperative of Jefferson City in the state of Missouri resulting in a double unbalanced fault condition. The data used in the example problem has been supplied through the courtesy of the …
Some Factors Affecting The Results In Cyclic Triaxial Tests, Suresh Kumar Chaudhary
Some Factors Affecting The Results In Cyclic Triaxial Tests, Suresh Kumar Chaudhary
Masters Theses
"A major cause of damage to structures and earth embankments during earthquakes or any other such dynamic vibrating loading conditions has been the liquefaction of saturated sands. There have been several investigations to establish a convenient and relatively simple laboratory test procedure and to study the nature of field conditions leading to sand liquefaction. This investigation evaluates the effects of sample size, testing frequency, and the method of sample preparation on the number of cycles to cause initial liquefaction in pulsating triaxial tests using standardized equipment and test procedures. It has been found that sample size does affect test results …
Normal Mode Method Applied To The Transient Longitudinal Vibrations Of A Finite Rod With Material Damping And Viscoelastic Dispersion, David Arthur Levene
Normal Mode Method Applied To The Transient Longitudinal Vibrations Of A Finite Rod With Material Damping And Viscoelastic Dispersion, David Arthur Levene
Masters Theses
"Longitudinal vibrations of a finite rod with material damping and frequency dependent material properties are examined. The normal mode method is used to investigate the transient response of a rod which is free to move in the longitudinal direction and is subjected to a transient longitudinal loading condition at one end. The equations of motion are derived and solved using both the differential equations approach and the energy methods approach of the normal mode method. The effects of material damping and frequency dependent material properties are considered by formulating the stress-strain relation for the material such that the modulus of …
Comparing Community Resources To Industrial Needs With Application To Daviess County, Missouri, Jay Eldon Waggoner Jr.
Comparing Community Resources To Industrial Needs With Application To Daviess County, Missouri, Jay Eldon Waggoner Jr.
Masters Theses
"A method of matching industries with communities, the modified Miller-Weiss Indugram, is developed. The technique compares the environmental needs of industry with the environmental resources of a community. The comparison is based upon twenty-five environmental factors. Application of the technique is made to Daviess County, Missouri. Results indicate those industries which are best suited for this rural area"--Abstract, page ii.
The Effect Of 15% Mno On The Phase Relations In The System Cao-Feo-Sio₂ At 1450ºc, Aquil Ahmad
The Effect Of 15% Mno On The Phase Relations In The System Cao-Feo-Sio₂ At 1450ºc, Aquil Ahmad
Masters Theses
"A study was made of the phase relations at 1450ºC in the systems CaO-FeO-SiO₂ and CaO-FeO-SiO₂ -15% MnO, in equilibrium with metallic iron. The stability region of different phases was determined by microscopic examination and electron-beam microprobe analysis of the quenched specimens. The effect of 15% MnO on the liquid saturation boundary of the system CaO-(FeO+MnO)-SiO₂ was discussed in terms of the effect of MnO on slag making reactions in the Basic Oxygen Furnace steelmaking process"--Abstract, page ii.
A Hardware And Software Interface Between A Graphics Terminal And The Scc 650 Computer, George Irvin Rhine Jr.
A Hardware And Software Interface Between A Graphics Terminal And The Scc 650 Computer, George Irvin Rhine Jr.
Masters Theses
"This paper describes the design of a digital interface between a graphic terminal and the SCC-650 computer. The graphic terminal-computer combination can be used as a stand alone system for small applications or can be used as a satellite processor for a larger system such as the IBM System 360, The interface is designed utilizing DTL NAND type integrated circuits. Its primary functions may be divided into three main categories: (1) to give level conversion, (2) control, and (3) data manipulation. All requests for data transfers are initiated by the computer, the interface then assumes a control mode which handles …