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Articles 6811 - 6840 of 8042
Full-Text Articles in Entire DC Network
Measurement Of The Surface Energy Of Rock By The Three-Point Bending Of Notched Beams, John Walter Corwine
Measurement Of The Surface Energy Of Rock By The Three-Point Bending Of Notched Beams, John Walter Corwine
Masters Theses
"In this investigation, the surface energy of a medium-grained igneous rock (Barre granite) was measured by breaking small, notched beams in bending. The technique was adapted from fracture toughness tests that have been used with metals and ceramics. The equations used for the calculation of surface energy were derived from several writers' equations for the stress intensity at the end of a notch in a beam subject to bending. Beam thickness, notch width and mineral occurring at the notch tip were evaluated for their influence on the calculated values of surface energy. The surface energy values obtained were used in …
Failure Of Lined And Unlined Small-Scale Cavities In Rock-Like Materials, Seung-Ki Yang
Failure Of Lined And Unlined Small-Scale Cavities In Rock-Like Materials, Seung-Ki Yang
Masters Theses
"The strain conditions around statically loaded circular openings in rock-like materials and corresponding cavity-wall displacements were determined experimentally with resistance strain gages. The models were fabricated with lined and unlined openings simulating underground tunnels. Tests were performed with models of two different materials in plane stress and plane strain. Rock-like materials were designed and the strain gages were embedded at selected points within each model. The models often failed by tensile splitting through the opening early in the loading cycle causing the strains at certain points to deviate considerably from the theoretical values. Tangential strains on the vertical axis were …
Parameters Effecting The Dynamic Properties Of A Saturated Cohesive Soil Tested In Cyclical Simple Shear, William Kenneth Andrew V
Parameters Effecting The Dynamic Properties Of A Saturated Cohesive Soil Tested In Cyclical Simple Shear, William Kenneth Andrew V
Masters Theses
"Cyclical simple shear tests were performed on block samples of a remolded clay mixture of 3 parts kaolinite to 1 part of bentonite mixed at 110% water content. The samples had base sizes of 8x8, 4x4, and 2x2 inches square and heights of 1, 2, 4, and 8 inches. The simple shear tests were performed by using a predetermined sinusoidal displacement, at frequencies of 1, 2, and 5 hertz. The shear modulus which was normalized by dividing it by the shear strength, and the hysteretic damping factor which was expressed as the percent of critical damping, were evaluated from a …
Evaluation Of The Carbon Adsorption Method With Parallel Solvent Extraction Studies, Stanley Kent Wagher
Evaluation Of The Carbon Adsorption Method With Parallel Solvent Extraction Studies, Stanley Kent Wagher
Masters Theses
"In spite of the importance of the carbon adsorption method (CAM) in determining drinking water quality and its wide use in research and plant control studies, little work has been undertaken to quantitatively and qualitatively evaluate the method, especially under field conditions. This investigation was, therefore, undertaken in order to develop a test system consisting of equipment and procedures which would make possible the field evaluation of the carbon adsorption method by parallel solvent extraction studies, and to employ this system in preliminary field investigations to establish guidelines for the experimental conditions required for its effective application. The test system …
The Anodic Dissolution Of Tin In Acidic Chloride Solutions, Edward Chung-Hong Liu
The Anodic Dissolution Of Tin In Acidic Chloride Solutions, Edward Chung-Hong Liu
Masters Theses
"The anodic dissolution of Sn in acidic chloride solutions (pH = -2.0 to 2.9) was studied at 25ºC. The apparent valence of the dissolving ions varied from about 0.4 to 2.4, a function of both electrolyte and c.d. The complexing of Sn⁺² by Cl⁻ had an important influence with SnCl₃⁻ apparently being the dominant products. A reaction sequence is proposed involving the step-wide oxidation of Sn accompanied by reaction with Cl⁻"--Abstract, page 1.
An Analysis Of A Quadrature Double-Sideband/Frequency Modulated Communication System, Denny Ray Townson
An Analysis Of A Quadrature Double-Sideband/Frequency Modulated Communication System, Denny Ray Townson
Masters Theses
"A QDSB/FM communication system is analyzed with emphasis placed on the QDSB demodulation process and the AGC action in the FM transmitter. The effect of noise in both the pilot and message signals is investigated. The detection gain and mean square error is calculated for the QDSB baseband demodulation process. The mean square error is also evaluated for the QDSB/FM system. The AGC circuit is simulated on a digital computer. Errors introduced into the AGC system are analyzed with emphasis placed on nonlinear gain functions for the voltage controlled amplifier"--Abstract, page ii.
A Systematic Study Of Instrument Variables Upon The Accuracy Of Microprobe Analysis, R. A. Parr
A Systematic Study Of Instrument Variables Upon The Accuracy Of Microprobe Analysis, R. A. Parr
Masters Theses
"The purpose of this investigation was to study the effect of instrument parameter changes upon X-ray intensity measurements of the copper-manganese system. The parameters utilized in this study included: (1) polished, contaminated, and 600 grit surfaces ; (2) constant sample current and constant beam current modes; and (3) 15 KV, 20 KV, and 25 KV accelerating potentials. Inspection of the data disclosed three interesting points: (1) copper and manganese X-ray intensity measurements appear to be a linear function of composition in the 15 KV through 25 KV accelerating potential range; (2) electron backscatter measurements consistently show in a limited range …
On The Flow Near An Enclosed Rotating Blade In The Neighborhood Of The Ground, Tze-Lien Liang
On The Flow Near An Enclosed Rotating Blade In The Neighborhood Of The Ground, Tze-Lien Liang
Masters Theses
"The flow in the vicinity of an enclosed rotating blade near the ground was studied both analytically and experimentally. Experimental results were obtained by making pitot tube traverses across the face of the housing but gave only a qualitative indication of the velocity distribution. Tufts of strings were used to locate the flow directions in the vicinity of the ground and the housing. The two dimensional potential flow solution was found to yield unreasonable results for this flow configuration due to viscous and rotative effects. The three-dimensional Navier-Stokes equations were solved numerically by using the successive underrelaxation method. The results …
Determination Of Reservoir Characteristics From Capillary Pressure Curves And Electrical Properties Of Rocks, Prasanta Kumar Guharoy
Determination Of Reservoir Characteristics From Capillary Pressure Curves And Electrical Properties Of Rocks, Prasanta Kumar Guharoy
Masters Theses
"Based upon the assumptions that a porous medium is analogous to a bundle of capillary tubes and that there is equivalence of electrical and hydraulic tortuosity in a porous medium, empirical expressions are presented which relate capillary pressure data and electrical properties of the rock to the porosity, permeability and relative-water permeability, respectively, of completely water-wet rocks. Experimental data are presented for comparison in order to verify their validity. Three principal models are presented, each of which is characterized by a particular expression for estimating tortuosity. The method of determining this parameter was varied in order to find the form …
An Investigation Of The Adjustable Element Concept For Design Of Automotive Exhaust Mufflers, Phillip Scott Gegesky
An Investigation Of The Adjustable Element Concept For Design Of Automotive Exhaust Mufflers, Phillip Scott Gegesky
Masters Theses
"The concept of the adjustable muffler is felt to be a step in the direction of easing the present tedium of constructing and testing prototype mufflers. The evaluation of such a muffler also furthers the knowledge of the interaction of acoustic elements. A review of past and present efforts in the design and evaluation of acoustic filters and filter elements is herein presented. Some consideration is given to phenomena, such as tube attenuation and transverse modes of vibration, which are encountered in muffler evaluation techniques. The characteristics of wave guides are discussed at length. The solution of the plane wave …
An Investigation Of Mining Effluent And Water Quality In The "New Lead Belt" Of Southeastern Missouri, Hong Wen Chen
An Investigation Of Mining Effluent And Water Quality In The "New Lead Belt" Of Southeastern Missouri, Hong Wen Chen
Masters Theses
"A field and laboratory investigation was carried out to collect background data for stream water quality in the New Lead Belt of Southeastern Missouri. The parameters measured were temperature, hydrogen ion concentration, hardness, alkalinity, turbidity and fluorides. A prolific algal and microbial growth was found in Bee Fork Creek which receives the mining and milling wastewater effluent from the Fletcher Mine. The laboratory studies were conducted to examine the biological effects of the organic flotation reagents used in the mining operations. The studies included Gram staining of bacteria, antimicrobial effects of milling reagents, bacterial fermentation tests of sodium isopropyl xanthate …
The Possible Correlation Of Carcinogenic Activity With Electronic Structure Of Benz(A)Anthracene, Patricia Joan Blair
The Possible Correlation Of Carcinogenic Activity With Electronic Structure Of Benz(A)Anthracene, Patricia Joan Blair
Masters Theses
"The electronic structure of benz(a)anthracene based on the sigma and pi electrons was predicted by the modified intermediate neglect of differential overlap (MINDO) molecular orbital method and compared with the pi electronic structure determined by the Pople method. The crystalline molecular structure was used for both methods. The Pople calculation was also done on the aromatic molecular structure and a combination structure which assumed the bond lengths of the crystal structure and the bond angles of the aromatic structure. Chemical properties predicted by the MINDO and POPLE electronic structures were compared; the MINDO results provided the best agreement with experimental …
Cathodic Behavior Of Co, Co-Fe Alloys And Some Other Metals In Acids In A Cathodic Protection Arrangement, Ram Bajaj
Masters Theses
"During cathodic protection of a corroding metal, electrons are forced into the metal by a sacrificial anode, a battery or a rectifier. These electrons, which constitute the suppressing or external current, are discharged (by H⁺ of the corrosive liquid) on the local cathode of the corroding metal decreasing the emf of the local cells, and, thus, reducing the cell current or the rate of corrosion of the metal. This process was studied in detail by finding out the relationship existing between the cell and suppressing currents. The study was made using two circuits: the cell circuit (representing the local current) …
Transient Response Of A Vibration Isolation System, Hemendra Shantilal Acharya
Transient Response Of A Vibration Isolation System, Hemendra Shantilal Acharya
Masters Theses
"A practical procedure for investigating the performance of a vibration isolation system under transient conditions is presented. For this investigation, an induction motor with an unbalanced rotor is studied during the period when it accelerates to its operating speed from rest. Using Newton's second law of motion, equations of motion are derived, first neglecting and then considering the effect of "inertia torque". This torque is produced by the inertia force resulting from vertical acceleration of the unbalanced mass. The equations are solved on a digital computer using the Runge-Kutta method of order 4. The results obtained are compared with those …
The Radial Distribution Curve Of "Anomalous" Water By X-Ray Diffraction, Jerome Dechelette
The Radial Distribution Curve Of "Anomalous" Water By X-Ray Diffraction, Jerome Dechelette
Masters Theses
"Amorphous and liquid samples, believed to be "anomalous" water were studied by X-ray diffraction. A diffusion ring, characteristic of liquids and glass was observed at Θ =10.5º. For purposes of comparison an X-ray diffraction pattern was obtained for pure water under nearly identical conditions. By means of a microdensitometer, X-ray intensity curves were prepared from the diffraction patterns and corrected for absorption and polarization. From the Fourier transform of the intensities, we obtained the radial distribution curves. The radial distribution curve for water, obtained in previous work, shows an initial peak at 2.9Å. This peak is due to the nearest …
The Assignment Problem And A Suboptimal Solution Technique, William Barry Gregory
The Assignment Problem And A Suboptimal Solution Technique, William Barry Gregory
Masters Theses
"A technique is presented which finds a fast suboptimal solution to the assignment problem. This same technique is then applied to two large dynamic programming problems for which the optimal solution is not known. These examples illustrate how easily this technique can be applied and that it is better than most optimizing techniques because it is fast, cheap and only minor hand calculations are needed. The effect of different initial solutions and their value are compared and it is found that the initial solution is not as significant in a suboptimal technique as in an optimizing technique. The initial solution …
Multi-Stage Shear Testing Of A Cohesionless Soil, Robert Clyde Gullic
Multi-Stage Shear Testing Of A Cohesionless Soil, Robert Clyde Gullic
Masters Theses
"The multi-stage test is a procedure by which a soil's shear strength parameters can be evaluated by the use of a single sample of the material. The object of the investigation is to evaluate to what extent multi-stage testing can be used on a cohesionless material. Three types of tests, using conventional and multi-stage procedures are evaluated. They are: direct shear/consolidated drained, triaxial compression/consolidated drained and triaxial compression/consolidated undrained shear tests. It was found that multi-stage testing can easily be performed and the shear strength parameter thetaf obtained from these tests are in good agreement with those obtained from …
A Digital Computer Program For Studying Elasto-Plastic Structural Behavior Due To Cyclic Loading, Rameshchandra Chandulal Hazariwala
A Digital Computer Program For Studying Elasto-Plastic Structural Behavior Due To Cyclic Loading, Rameshchandra Chandulal Hazariwala
Masters Theses
"A computer program has been developed to study the behavior of plane stress structures under cyclic loading. Such phenomena as thermal ratcheting, alternate plasticity, shake-down and the Bauschinger effect may be considered. The incremental theory of plasticity has been used. The program deals with realistic conditions such as nonlinear strain hardening, nonlinear temperature distribution and occurrence of both compressive and tensile plastic flow. The concept of an average material property has been used. Thermal ratcheting of a beam subjected to a constant bending moment and a temperature cycle has been studied in detail. The analysis shows analytically that the rate …
A Comparative Study Of Experimental And Computed Compressibility Factors Of Methane-Nitrogen-Carbon Dioxide System, Piloo Eruchshaw Ilavia
A Comparative Study Of Experimental And Computed Compressibility Factors Of Methane-Nitrogen-Carbon Dioxide System, Piloo Eruchshaw Ilavia
Masters Theses
"Experimentally determined compressibility factors of a natural gas with impurities like carbon dioxide and nitrogen are found to differ with the values computed by various methods making use of compositional breakup of the gas. Compressibility factors for five mixtures of known composition were experimentally determined at room temperature, 100ºF, 125ºF, and 150ºF, and at pressure ranging between 1000 psi to 4000 psi. Using the known composition of the mixtures, compressibility factors were calculated by additive volume method and by Eilerts method. The deviation between computed and experimentally determined compressibility factors are at a maximum in the lower and higher pressure …
Chromatographic Determination Of Hydrocarbons Based On Retention Time Data For Squalene And Tetracyanoethylated Pentaerythritol Columns, Mehdi Honarpour
Chromatographic Determination Of Hydrocarbons Based On Retention Time Data For Squalene And Tetracyanoethylated Pentaerythritol Columns, Mehdi Honarpour
Masters Theses
"The purpose of this thesis is to investigate the theory that when several members of a homologous series are injected into a gas chromatograph, at a given flow rate and column temperature, the lograrithm of their retention time as a function of some increasing property of the homologous series may be presented as a straight line and to develop their equations. Experimental procedure was accomplished for the normal paraffin series with 7 1/2% squalene and 10% Tetracyanoethylated Pentaerythritol (T.C.E.pageE.) columns and the relation between retention time and carbon number was determined. The same type of development was employed for aromatic …
Simultaneous Knudsen- And Torsion- Effusion Measurements Of The Vapor Pressures Of Tetraphenyltin And Hexaphenylditin, Dale Keiser
Simultaneous Knudsen- And Torsion- Effusion Measurements Of The Vapor Pressures Of Tetraphenyltin And Hexaphenylditin, Dale Keiser
Masters Theses
No abstract provided.
Odo Of Morimond: His System Of Contemplation As Based On Matthew Xx, The Parable Of The Vineyard, Richard M. Green
Odo Of Morimond: His System Of Contemplation As Based On Matthew Xx, The Parable Of The Vineyard, Richard M. Green
Masters Theses
No abstract provided.
Transpiration Measurements Of The Decomposition Pressures Of Barium Hexafluorosilicate, Kemal Cankaya
Transpiration Measurements Of The Decomposition Pressures Of Barium Hexafluorosilicate, Kemal Cankaya
Masters Theses
No abstract provided.
History And Symbol In Hugh Of Saint-Victor, Thomas M. Mcelmeel
History And Symbol In Hugh Of Saint-Victor, Thomas M. Mcelmeel
Masters Theses
No abstract provided.
Preparation And Lead Tetraacetate Oxidation Of Aldehydic Hydrazones, Alan J. Quarfoot
Preparation And Lead Tetraacetate Oxidation Of Aldehydic Hydrazones, Alan J. Quarfoot
Masters Theses
No abstract provided.
Staff Perceptions Of Psychiatric Patients In Relation To Disruptive Behavior, Thaddeus I. Stachowiak
Staff Perceptions Of Psychiatric Patients In Relation To Disruptive Behavior, Thaddeus I. Stachowiak
Masters Theses
No abstract provided.
A Study Of Some Matrix Elements For The Four-Pion Decay Mode Of Neutral Bosons, George Victor Weller
A Study Of Some Matrix Elements For The Four-Pion Decay Mode Of Neutral Bosons, George Victor Weller
Masters Theses
No abstract provided.
An Experimental Analysis Of Human Social Behavior In A Competitive Situation With The Opportunity For Aggression, William A. Michael
An Experimental Analysis Of Human Social Behavior In A Competitive Situation With The Opportunity For Aggression, William A. Michael
Masters Theses
No abstract provided.
An Analysis Of The Comparative Effectiveness Of Day Center Treatment And Out-Patient Treatment For A Psychiatric Population, John T. Gallagher
An Analysis Of The Comparative Effectiveness Of Day Center Treatment And Out-Patient Treatment For A Psychiatric Population, John T. Gallagher
Masters Theses
No abstract provided.
Stimulus Balance And Preference In The Japanese Quail, Richard Leon Mead
Stimulus Balance And Preference In The Japanese Quail, Richard Leon Mead
Masters Theses
No abstract provided.