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Articles 16351 - 16380 of 16562
Full-Text Articles in Entire DC Network
The Altar Of Sacrifice, Rev. Gerald Hellem
Polypropylene Fibers, Anthony Vincent Galanti
Polypropylene Fibers, Anthony Vincent Galanti
Theses
One of the latest members of the rapidly growing therrnoplastic polymer family which appears capable of successfully competing with the currently saturated textile and chemical markets is polypropylene fiber. The objectives of this Thesis were to: (1) examine the effects of polymer characteristics and fiber processing conditions on the properties of polypropylene fibers, and (2) correlate all existing information on the physical, chemical, and mechanical properties of polypropylene fibers and comparatively evaluate this material with other fibers, natural and synthetic.
Polypropylene is the first member of a new group of polymers prepared by a mechanism defined as "stereospecific" polymerization. From …
Mass Transfer Into Cylindrical Liquid Films Measurement Of Liquid Diffusivities, Ronald Francis Lovenguth
Mass Transfer Into Cylindrical Liquid Films Measurement Of Liquid Diffusivities, Ronald Francis Lovenguth
Theses
This thesis was undertaken to augment and validate the previous work of Ratcliff and Reid(7) in the area of diffusion of immiscible liquids. Their novel approach to this particular problem of liquid diffusion led the author to consider an experimental technique that has been used in gas-liquid studies. A short vetted-wall column was used to determine the rate of mass transfer of benzene and toluene into thin cylindrical films of water. A general analytical solution for the rate of mass transfer has been derived and is given below. This solution was checked using the system benzene-water.
G=3.63(Π(ρω-ρ …
Thermal Conductivity Of Solid Materials, Irwin N. Huppert
Thermal Conductivity Of Solid Materials, Irwin N. Huppert
Theses
A literature search on the methods of determining the thermal conductivity of solids has been made.
A compilation of the various methods of determining the thermal conductivity of solids presented in the literature is given in the report. In general, the literature is lacking in correlations of thermal conductivity with other properties of solid materials. A review of the correlations found is presented. A summary of data presented in the literature is presented in the text.
A method of determining the thermal conductivity of solid materials without measuring the heat flow through the test specimen is presented. The use of …
Esterification Of Oleic Acid With Oleyl Alcohol, Robert Persurance
Esterification Of Oleic Acid With Oleyl Alcohol, Robert Persurance
Theses
The esterification of oleic acid with oleyl alcohol was studied. A literature search showed that the chemical kinetics for this reaction had not been studied previously.
In the temperature range of 150 to 200°C. and up to a conversion of about 85 per cent, the esterification was found to be a second order reaction when the water of reaction was removed from the system by simple distillation.
Para-toluenesulfonic acid is an effective catalyst for this system, and the observed specific rate constant is a linear function of the catalyst concentration.
The effect of temperature on the specific rate constant for …
Ceramic Wall Reliefs For Church Interiors And Exteriors, Sherwood Smith
Ceramic Wall Reliefs For Church Interiors And Exteriors, Sherwood Smith
Theses
The purpose of this thesis is to execute a series of five ceramic wall reliefs. These reliefs will be made abstract through the use of symbols and will attempt to give connotative ecclesiatic meaning in church surroundings.
Investigation Of Effects Of Ph, Ionic Strength, And Drying Temp. On Dimensional Stability Of Film, Harry N. Parsonage, George A. Pittman
Investigation Of Effects Of Ph, Ionic Strength, And Drying Temp. On Dimensional Stability Of Film, Harry N. Parsonage, George A. Pittman
Theses
An investigation into the effect effects of chemical changes made in a processing system and drying temperature [with respect] to dimensional displacements of a final image was carried out using Eastman Kodak's # 8430 aerial duplicating film. Image displacements over both long and short distances were measured.
Over approximately 162 mm., drying at a temperature equal to that of processing, 70°F, resulted in no significant special displacement of the final image, while drying at higher temperatures prodded correspondingly larger displacements. A pH system between bathe similar to that found in a conventional process resulted in dimensional displacements, over the short …
A Kinetic Densitometer, Jerry Hughes
Experiments In The Potentialities Of Glazes Developed From Naturally Occurring Minerals And Industrial Waste Products Common To Potsdam, St. Lawrence County, New York, Arthur Sennett
Theses
Not Included
Effect Of Liquid Viscosity On Performance Of Wire Mesh Entrainment Separators, Raymond Paul Vogel
Effect Of Liquid Viscosity On Performance Of Wire Mesh Entrainment Separators, Raymond Paul Vogel
Theses
The knitted wire mesh entrainment separator, commonly referred to as a demister*, is in common use to separate entrained liquid from vapor streams. However, little quantitative information is available concerning the effect of physical properties of the entrained liquid on allowable gas velocities.
Studies were made on two demister styles to determine the effect of liquid viscosity on demister performance, Liquid viscosities from 0.9 to 12 centipoise were investigated using water, glycerine-water mixtures and heavy no. 2 fuel oil as the test liquids. Air was used as the gas medium in all cases.
Regression analysis of the test data indicates …
Reconstructed Wavefronts: Comparative "Quality" Of Several Systems, William Cook
Reconstructed Wavefronts: Comparative "Quality" Of Several Systems, William Cook
Theses
Not provided.
Graphic, Identity Symbol Theories And The Creation Of An Institutional Graphic Image, James J. Burke Jr.
Graphic, Identity Symbol Theories And The Creation Of An Institutional Graphic Image, James J. Burke Jr.
Theses
Not provided.
Investigating Media As A Means Of Expression, Wolodymyr Pylyshenko
Investigating Media As A Means Of Expression, Wolodymyr Pylyshenko
Theses
None provided.
A Study Of Early Christian Symbols And Their Use In A Contemporary Church Interior, Marcella Connorton
A Study Of Early Christian Symbols And Their Use In A Contemporary Church Interior, Marcella Connorton
Theses
None provided.
Surface Treatment Of Pottery, Jon B. Curtis
Synthesis Of Trimethyl Borate By Ester Interchange, Hugh Murphy
Synthesis Of Trimethyl Borate By Ester Interchange, Hugh Murphy
Theses
Trimethyl borate was prepared by transesterification of a high—boiling methyl ester with a high—boiling trialkyl borate using a metal alcholate catalyst. Interchange occurred between n—amyl borate and the following methyl esters: dimethyl sulfate, parahydroxy methyl benzoate, methyl salicylate, and methyl stearate. Interchange also took place between methyl stearate and tribenzyl borate, tri—n—propyl borate, and tri—m, p—cresyl borate. Highest yields and purities resulted from reactions involving methyl stearate. Catalysts employed were magnesium—aluminum ethylate and aluminum Isopropoxide.
Two methods of separating the methanol—methyl borate azeotrope were evaluated: sulfuric acid extraction and salt splitting. Extraction with sulfuric acid was determined to be the …
A Study Of Continuous Photochemical Hydrolysis, Robert Parlante, Theodore Arthur Gropler
A Study Of Continuous Photochemical Hydrolysis, Robert Parlante, Theodore Arthur Gropler
Theses
In this investigation, the ultraviolet absorption spectra and the batch photochemical hydrolysis of monochloroacetic and monobromoacetic acid, and their potassium and sodium salts, have been measured and compared with those existing in the literature.
The continuous photochemical hydrolysis of sodium chloroacetate has been investigated for the first time. The continuous photolysis of uranyl oxalate was investigated and used as a chemical actinometer.
Gaseous material in the reactant feed has been found to be important at low flow rates.
Viscosity Of A Three Component System : Benzene-Ethanol-Acetic Acid At 20 Degrees C., 25 Degrees C., And 30 Degrees C, Alan Alvin Schetelich
Viscosity Of A Three Component System : Benzene-Ethanol-Acetic Acid At 20 Degrees C., 25 Degrees C., And 30 Degrees C, Alan Alvin Schetelich
Theses
The viscosity for the ternary system benzene-ethanol-acetic acid, has been determined. The viscosity maximum shown in the ethanol-acetic acid system is clearly distinguished in the ternary system as well. The viscosity minima which occur in the benzene-ethanol, and benzene-acetic acid systems are too slight to be readily apparent in the ternary system.
The ternary system viscosity was determined at temperatures of 20, 25, and 30° C. The effect of increasing the temperature from 20° C for the ternary system was to produce corresponding curves of lower viscosity. The maximum viscosity noted in the ternary system as well as the maximum …
Vapor Liquid Equilibria, Niranjan Prasad Shukla
Vapor Liquid Equilibria, Niranjan Prasad Shukla
Theses
A survey of the literature gave no reference to the n-Propanol Glycol system while the n-Propanol-Benzene system had been previously studied. Experimental data were found to agree closely with those existing in literature for the n-Propanol-Benzene binary system.
A ternary miscibility diagram at fixed temperature was found to give first-type of miscibility curve, i.e. n-Propanol was completely miscible in all proportions with Benzene and Ethylene Glycol, while Benzene and Ethylene Glycol were found to be partially miscible. The plait-point was determined by drawing tie-lines and using the Sherwood method as well as by the loga rithmic method of Hand. Both …
Equations Of State For Propyne, Thomas Marshall Stark
Equations Of State For Propyne, Thomas Marshall Stark
Theses
P-V-T data for propyne have been fit using the Martin-Hou and the Benedict-Webb-Rubin equations of state. The Martin-Hou equation, with its constants calculated from the critical properties and a vapor pressure point for the gas, fit up to 1.1 to 1.5 times the critical density with deviations of less than 1%. The Benedict-Webb-Rubin equation, with its constants calculated by the method of Joffe, resulted in greater deviations in the low pressure region than did the Martin-Hou equation; however, it also provided a better approximation of the data at high pressures and lower temperatures. The best over-all fit was obtained using …
The Electrical And Optical Properties Of Organic Semiconductors. Part 1 : Preliminary Survey And Purification Techniques, Bohdan Robert Czorny
The Electrical And Optical Properties Of Organic Semiconductors. Part 1 : Preliminary Survey And Purification Techniques, Bohdan Robert Czorny
Theses
The purpose of this work was to investigate the field of organic semiconductors and in particular to develop the means for preparing these materials in suitable condition for measurement and study of semiconducting properties. The first aspects of this project concerned with a preliminary survey of the field and techniques of ultra purification are covered in this work.
Anthracene was selected for investigation because it is the organic semiconductor most commonly studied by other investigators, and considerable published information exists for corroboration.
The preliminary survey elucidated the most promising methods of purification, which were chemical synthesis, sublimation, recrystallization from solvents …
Electromotive Deposition, Storage And Dissolution Of Active Hydrogen Upon Carbon Electrodes, Joseph Gabriel Di Masi
Electromotive Deposition, Storage And Dissolution Of Active Hydrogen Upon Carbon Electrodes, Joseph Gabriel Di Masi
Theses
The electromotive deposition, storage and dissolution of hydrogen upon carbon electrodes having real surface areas varying from one meter2/ gram to one-hundred ten meters2/ gram vas inves-tigated.
It has been found that a correlation exists between hydrogen storage and real area of the inner electrode. However, it has been further shown that storage of electromotive hydrogen is only for short periods of time, that is, several hours.
Separation Of Mononitrotoluenes By Clathration, Eugene Ivashkiv
Separation Of Mononitrotoluenes By Clathration, Eugene Ivashkiv
Theses
Thirty-one Werner-type compounds have been prepared, at least 10 of which were not previously investigated. Manganus tetra(4-methylpyridine)dithiocyanate, zinc tetra(4-methylpyridine)dithiocyanate, ferrous tetra(4-methylyridine)dithiocyanate, nickel tetra(4-methylpyridine)dithiocyanate and nickel tetra(pyridine) dithiocyanate can be used for clathration of mononitrotoluenes. The best results have been obtained with the complex formed between nickel dithiocyanate and l-methylpyridine. Three clathration stanges are needed to obtain 99 percent pure para-nitrotoluene. A clathration efficiency of 60 percent has been achieved per stage. A new process for the recovery of clathrated compounds has been developed. Clathration can be carried out as a cyclic process without the complex consumption when the developed method …
The Corrosiveness Of Phenols, Edgar George Kaup
The Corrosiveness Of Phenols, Edgar George Kaup
Theses
The effects of oxidizing agents, heat, light, and metallic catalysts on coloration in phenols is discussed, using data collected from the literature. The oxidation reaction is concluded to be the con-trolling factor in coloration. Corrosion data from laboratory experiments, field tests, and operating plants is presented for metals and non-metals in concentrated phenolic systems.
A Correlation Of Viscosity Of N-Paraffin Hydro-Carbons, Sheldon Krueger
A Correlation Of Viscosity Of N-Paraffin Hydro-Carbons, Sheldon Krueger
Theses
A linear relationship between the Log viscosity and the Log vapor pressure is shown to exist for each n-paraffin hydrocarbon from C3 to C20. The average error of these equation e is ± 1.5 per cent of the American Petroleum Institute's1 experimental values. The use of individual slopes for each equation is shown to be store accurate than one alone for all the viscosity data. These slopes e:thibit an unusual behavior by having a minimum value at undecane.
The slopes and intercepts are correlated with carbon number (the number of atoms in a n-paraffin Chain). These …
The Design And Fabrication Of A Cell To Measure The Thermal Conductivity Of Viscous Fluids, Donald William Hagedorn
The Design And Fabrication Of A Cell To Measure The Thermal Conductivity Of Viscous Fluids, Donald William Hagedorn
Theses
The purpose of this investigation was to design and construct a device to measure the thermal conductivity of viscous fluids. The thermal conductivity data obtained with this device will be used in later work on predicting film coefficients of heat transfer to non-Newtonian fluids.
A cell of the concentric cylinder type was fabricated. Main features of the cell are: two concentric bronze cylinders separated by a 1/8 inch annular space, a central water capable of producing a 10° C temperature gradient in the annular space, and two guard heaters on individual rheostats to control the end looses. The temperatures are …
Slow Compression Crushing Of Glass In Fluids, Peter Joseph Lucchesi
Slow Compression Crushing Of Glass In Fluids, Peter Joseph Lucchesi
Theses
Generally only a small fraction of the energy used in crushing, on the order of 1 or 2%, appears as new surface energy in the product. The purpose of this work was to determine if higher efficiencies could be achieved by the use of different fluids surrounding the particle during crushing.
Single particles of solid glass cylinders, standing on. end, were crushed by slow compression in the presence of air, water, methanol, carbon tetrachloride, and glycerol. No effect was found with the various fluids even when considerable pressure was developed in the surrounding fluid in some of the glycerol experiments. …
Carbon Tetrachloride-Xylene Equilibria, Michael Jay Ram
Carbon Tetrachloride-Xylene Equilibria, Michael Jay Ram
Theses
The liquid-liquid equilibria of the ternary systems carbon tetra-chloride-xylene-propylene glycol and carbon tetrachloride-xylene-diethylene glycol were investigated. The effectiveness of the glycols as selective solvents for xylene was represented by a plot of weight ratio xylene to carbon tetrachloride in each phase. It was found that the diethylene glycol was the better of the two solvents at concentrations resulting in more than 75% xylene in the xylene-carbon tetrachloride rich layer. At the lower xylene concentrations the propylene glycol was found more effective as a selective solvent.
A Study For Rural Development, Lawrence Irving Prashaw
Isobaric Vapor-Liquid Equilibria System : Benzene, Chlorobenzene, Phenol, Larry Madestau
Isobaric Vapor-Liquid Equilibria System : Benzene, Chlorobenzene, Phenol, Larry Madestau
Theses
Isobaric vapor-liquid equilibria were determined experimentally for the three binary systems benzene-chlorobenzene, benzene-phenol, and chlorobenzene-phenol; and for the corresponding ternary system benzene-chlorobenzene-phenol. Constants for the Chao modified Redlich-Kistler equations were calculated from the experimental data by the method of least squares. These constants were then used to predict vapor-liquid equilibria for the ternary system. The predicted values showed satisfactory agreement with those found experimentally.
A modified Ellis still was used for obtaining equilibrium data. Samples of vapor and liquid phases were analyzed by means of the F & M Model 720 vapor phase chromatograph. Benzene, chlorobenzene, and phenol used in …