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Articles 33841 - 33870 of 34518
Full-Text Articles in Physical Sciences and Mathematics
A Study Of The Effect Of Additives On Portland Cement, Sidney Gray Dunbar
A Study Of The Effect Of Additives On Portland Cement, Sidney Gray Dunbar
Honors Theses
First, hydration tests were made on cement samples containing various percentages of Sodium Methyl Siliconate and Sodium Silicate. It was decided that it would be easier to determine what effect an additive would have upon concrete, if concrete blocks were actually made. Therefore, many blocks were made containing different amounts of various additives. Some of the concrete blocks were cut into cubes and slabs. The cubes were tested for their compressive strength. The slabs were tested for their resistance to corrosion from hydrochloric, acetic, and lactic acids. Some slabs were coated with certain substances to see if the coatings would …
Alkylation Of Phenol, Raymond Joseph Thimineur
Alkylation Of Phenol, Raymond Joseph Thimineur
Honors Theses
The purpose of this research project is to study the alkylation of phenol with n-butyl alcohol and optically active l-sec-butyl alcohol using a chemically activated alumina catalyst. The reaction of n-butyl alcohol with phenol is studied to determine if the alcohol is rearranged to give the same products obtained by alkylating with sec-butyl alcohol. The object of reacting optically active l-sec-butyl alcohol with phenol is to determine if the optical activity is retained, decreased, or complete racimazation occurs with this catalyst.
Thermal And Arc Resistance Of Polyester Resin Glass Reinforced Laminates, Frederick B. Budnik
Thermal And Arc Resistance Of Polyester Resin Glass Reinforced Laminates, Frederick B. Budnik
Honors Theses
The heat resistance of several types of polyester resins are studied by measuring the flexural strength of glass reinforced laminates before and after conditioning at 200°C. Arc resistance readings are also taken. The type of saturated acid, glycol and monomer is varied. The ratio of saturated to unsaturated acid and the ratio of monomer to base resin is also studied. Chlorendic acid improves the heat resistance over phthalic and isophthalic acids but it lowers the arc resistance. Ethylene glycol yields resins with the highest flexural strengths. Styrene monomer content has little effect on heat resistance up to 40%. In the …
Thermodynamic Properties Of Water Adsorbed On Kaolinite, S. John Bennett
Thermodynamic Properties Of Water Adsorbed On Kaolinite, S. John Bennett
Theses and Dissertations
The object of the work presented in this thesis was to obtain quantitative values of the thermodynamic changes in water upon adsorption by kaolinite. Two methode were used. The first was a determination of the differential heat content and entropy of adsorption. The second method included a thermodynamic evaluation of the B.E.T. "c" constant expressed in terms of the Gibbs standard free energy of adsorption. The experimental data gave satisfactory results in determining the differential and standard thermodynamic functions or free energy, entropy, and heat content of adsorption. The adsorption of water on kaolinite appears to be a van der …
The Decomposition Of Solid Barium Nitrate By Gamma Rays, Lawrence E. Lamar
The Decomposition Of Solid Barium Nitrate By Gamma Rays, Lawrence E. Lamar
Chemistry and Chemical Biology ETDs
Very little work has been done on the chemical effects produced during the irradiation of solid materials. Although some research has been reported concerning the action of ultraviolet light on solid nitrates, most of the information in the literature is based upon the use of nuclear radiations.
Two types of reaction mechanisms have been proposed by previous authors. The direct decomposition of the metal nitrate to give the nitrate and oxygen was concluded from measurements of optical absorption. The ionization of nitrate ion to yield mononitrogen trioxide which could disassociate after capture of an electron was also suggested. The mononitrogen …
A Survey Of The Effects Of Changes In PH, Solvent And Salt Concentration Upon The Rate Of The Periodate-Glycol Reaction, Jay E. Taylor, Benadetto Soldano, George A. Hall
A Survey Of The Effects Of Changes In PH, Solvent And Salt Concentration Upon The Rate Of The Periodate-Glycol Reaction, Jay E. Taylor, Benadetto Soldano, George A. Hall
Chemistry Department: Faculty Publications
A quantitative study of the effect of the periodate- glycol complex upon the rate of the periodate-glycol reaction was made in an earlier paper. The data for the present paper were taken before those of the previously published paper and, for the most part, before the importance of the periodate-glycol complex had been recognized. It has not been possible therefore to interpret the present data with the degree of thoroughness of the earlier paper. However, certain very interesting conclusions can be made.
The Effect of Variation of pH.
Effect of Changes in Solvent.
The Effects of Certain Salts.
Preparation, Purification And Cis-Trans Isomerization Of 2-Butene-1, 4-Diol, Roman Stephan Slysh
Preparation, Purification And Cis-Trans Isomerization Of 2-Butene-1, 4-Diol, Roman Stephan Slysh
Honors Theses
The preparation of cis- and trans-2-butene-1,4-diol has been reported in chemical literature by numerous workers. A well established procedure to obtain the cis isomer is to hydrogenate 2-butyne-1,4-diol at two to four atmospheres pressure in the presence of catalysts, such as Raney nickel or colloidal palladium. This reduction is selective and can be stopped easily at the ethylenic stage. The reaction has been studied by Lozac'h who stated that the Raman spectrum of 2-butene-1,4-diol prepared in this way indicates the presence of the cis iomer only. Lozac'h does not mention the degree of purity of this product and nothing could …
Phase Equilibrium In The 1-Butene-Water System And Correlation Of Hydrocarbon-Water Solubility Data, T. W. Leland
Phase Equilibrium In The 1-Butene-Water System And Correlation Of Hydrocarbon-Water Solubility Data, T. W. Leland
Journal of the Arkansas Academy of Science
No abstract provided.
Some Optical Properties Of Vapor-Deposited Films Of Arsenic, Antimony, And Bismuth, Zaboj V. Harvalik
Some Optical Properties Of Vapor-Deposited Films Of Arsenic, Antimony, And Bismuth, Zaboj V. Harvalik
Journal of the Arkansas Academy of Science
No abstract provided.
The Construction Of A Recording Raman Spectrometer And An Analysis Of The Vibrational Spectrum Of Bromobenzene And Its Monodeuterium Isomers., William Ward Daniels
The Construction Of A Recording Raman Spectrometer And An Analysis Of The Vibrational Spectrum Of Bromobenzene And Its Monodeuterium Isomers., William Ward Daniels
LSU Historical Dissertations and Theses
No abstract provided.
Elementary Chemical Calculations, Edward S. Amis
Elementary Chemical Calculations, Edward S. Amis
Journal of the Arkansas Academy of Science
No abstract provided.
Possibility Of Weak Alpha Branching In Radium D, B. R. Miccoli, R. R. Edwards, B. L. Robinson, R. W. Fink
Possibility Of Weak Alpha Branching In Radium D, B. R. Miccoli, R. R. Edwards, B. L. Robinson, R. W. Fink
Journal of the Arkansas Academy of Science
No abstract provided.
Chromatographic Studies., Richard Thomas Moravek
Chromatographic Studies., Richard Thomas Moravek
LSU Historical Dissertations and Theses
No abstract provided.
Study Of The Complex Products Of Polymerization Of Some Quinones By Esr Spectroscopy, Juana Acrivos, M Blois
Study Of The Complex Products Of Polymerization Of Some Quinones By Esr Spectroscopy, Juana Acrivos, M Blois
Faculty Publications, Chemistry
No abstract provided.
Esr Of Defect Centers In Magnesium Oxide, John Wertz, Juana Acrivos
Esr Of Defect Centers In Magnesium Oxide, John Wertz, Juana Acrivos
Faculty Publications, Chemistry
B8. Electron Spin Resonance of Defect Centers in Magnesium Oxide.* John E. Wertz and Juana L. Vivo, University of Minnesota.
Esr Of Impurities In Mgo, John Wertz, Juana Vivó, B. Musulin
Esr Of Impurities In Mgo, John Wertz, Juana Vivó, B. Musulin
Faculty Publications, Chemistry
SP1. Electron Spin Resonance of Impurities in Magnesium Oxide. John E. Wertz, Juana L. Vivo, and Boris Musulin, University of Minnesota.
Separation Of Germanium, Lead, Zinc, And Cadmium By Anion Exchange, Franklin Maynard Hill
Separation Of Germanium, Lead, Zinc, And Cadmium By Anion Exchange, Franklin Maynard Hill
Masters Theses
"The object of this study was to investigate the ion exchange behavior of germanium and apply the anion exchange technique for the separation of germanium, cadmium, lead, and zinc.
A new interest in germanium has developed because of its recent industrial application as a semi-conductor. Analytical methods for the separation and analysis of germanium in low concentrations have not been perfected. Krause and Johnson, in a recent review, discussed and evaluated a number of methods.
Most of the methods for the analysis of germanium require a preliminary separation. The analytical methods for germanium reported in the literature are troublesome and …
Condensation Reaction Of Terephthaladehyde And Acetophenone, Lloyd J. Mitchell
Condensation Reaction Of Terephthaladehyde And Acetophenone, Lloyd J. Mitchell
University of the Pacific Theses and Dissertations
The plant pigments constitute a fascinating group of compounds whose constitution has only recently been partially clarified. Roughly speaking, there are two main groups of pigment: the plastids, associated with the protoplasmic structure of plants, and the anthocyanins, generally found in solution in the cell sap. The term “anthocyanin” is derived from the Greek, “antho” signifying flower and “cyan” meaning blue, and was introduced by the botanist Marquart in 1835 to designate the blue pigments of flowers. It has since been extended to include all of the pigments of this group, the anthocyanin pigments being responsible for the innumerable shades …
Addition Of Ketene To Ethylene Oxide, John Philip Friedrich
Addition Of Ketene To Ethylene Oxide, John Philip Friedrich
Masters Theses
"The object of this work was to study the reaction between ethylene oxide and ketene, and if possible, to isolate and identify the postulated γ-butyrolactone. Although the results could hardly be described as completely gratifying, they were at least in a sense positive. Many possibilities remain with regard to further modifications of the experimental work on this problem, however it is the author's sincere wish that this investigation will serve some useful purpose in the future"--Introduction, page 4.
The Synthesis Of 2-Methyl-3, 4-Benzpyrene And 2, 8-Dimethyl-3, 4-Benzpyrene., James W. Patton
The Synthesis Of 2-Methyl-3, 4-Benzpyrene And 2, 8-Dimethyl-3, 4-Benzpyrene., James W. Patton
Chemistry and Chemical Biology ETDs
In 1933 Cook, Hewett and Hieger (1) isolated a carcinogenic hydrocarbon from coal tar thought to be 3,4-benzpyrene (I).
Evaluations Of Two Proposed Mechanisms Of Cation Adsorption By Silicate Minerals, Norman D. Larsen
Evaluations Of Two Proposed Mechanisms Of Cation Adsorption By Silicate Minerals, Norman D. Larsen
Theses and Dissertations
Previous work done at the Brigham Young University by Andelin^1, Roberts^2, and Olsen^3, has established the mechanism by which xanthate collectors are adsorbed on molybdenite ores to produce the hydrophobic surfaces necessary for flotation. This thesis is an attempt to better understand the mechanism by which the silicate minerals, which are found in conjunction with the ores, become hydrophyllic and as a result are not floated when in contact with air bubbles. It has been previously established that silicate minerals do adsorb cations on their surfaces^4. The present study has been undertaken to more fully understand the mechanism by which …
A Polarographic Study Of Respiration In A Blue-Green Alga, Samuel Leonard Cooke Jr.
A Polarographic Study Of Respiration In A Blue-Green Alga, Samuel Leonard Cooke Jr.
Master's Theses
The study of many aspects of physiology is accomplished by the study of respiration under varied conditions. For this purpose, a simple, rapid, and relatively accurate respirometer would be useful. This project was undertaken to investigate the possibility of adapting previously described polarographic techniques to the measurement of respiration.
The Exchange Of Antimony Between Antimony Trichloride And Antimony Pentachloride In Carbon Tetrachloride Solution, Franklin Brett Barker
The Exchange Of Antimony Between Antimony Trichloride And Antimony Pentachloride In Carbon Tetrachloride Solution, Franklin Brett Barker
Chemistry and Chemical Biology ETDs
In the investigation of any chemical reaction, the main points of interest are the conditions of equilibrium, the rate at which equilibrium is approached, and the mechanisms by which the reaction occurs. The first of these is determined by the standard free energy change, a thermodynamic quantity which depends only upon the initial and final states of the system. However, two reactions having the same value of the standard free energy change may approach equilibrium at radically different rates, one being practically instantaneous and the other almost infinitely slow. The field of chemical kinetics is concerned with the study of …
A Semi-Micro Spectrophotometric Method Of Copper Analysis, Edgar Miller Layton
A Semi-Micro Spectrophotometric Method Of Copper Analysis, Edgar Miller Layton
Honors Theses
The Manhattan Project of the United States atomic energy program was designed essentially to produce methods and instruments of atomic warfare. Out of the many investigations made by the scientists and engineers working to attain this primary goal, much information of value was necessarily placed in the background and, as a consequence, a vast amount of material was only cursorily studied by these workers. The type of relationship between the per cent transmission and concentration decrease was to be investigated in the hope of establishing an empirical formula for use in a certain concentration range. As an added check on …
Electrodeposition And Cathode Potential, Kenneth Frederick Greenough
Electrodeposition And Cathode Potential, Kenneth Frederick Greenough
Honors Theses
When two electrodes are placed in a solution of an electrolyte and a voltage is applied, a continuous current will flow only when the voltage is equal to or greater than the decomposition potential of the electrolyte. At voltages above the decomposition potential, the current is proportional to the applied voltage, i.e. Ohm’s law where I = E/R. At voltages below, there is a temporary flow of current, existing until the products of electrolysis accumulate and produce an opposing voltage, causing the residual current to diminish. A plot of current versus applied voltage is at first almost horizontal, and the …
Properties Of Cement Acid Gels, Charles Ansel Suter
Properties Of Cement Acid Gels, Charles Ansel Suter
Honors Theses
This thesis summarizes the research conducted during the period June 1953 - June 1954 under the research fellowship established in the Department of Chemistry at Union College by the North American Cement Corporation. The research was performed under the direction of Professor Charles B. Hurd, to whom the author is indebted for many helpful suggestions and ideas.
Reactions In The Synthesis Of Indazole, Richard Velmer Webb
Reactions In The Synthesis Of Indazole, Richard Velmer Webb
Honors Theses
This investigation was undertaken to study the reaction mechanism involved in the formation of Indazole. A study was also made to determine the effect of a polar solvent on the yield of Indazole using Dreyfuss' method of preparation.
Coloration Of Alkali Halide Crystals, Gerald Kirwin Ryan
Coloration Of Alkali Halide Crystals, Gerald Kirwin Ryan
Honors Theses
In the experiments crystals were heated in the presence of the alkali metal or its vapors. The metal's electron goes to the site of the corresponding missing anion forming a F-center.
The Catalytic Vapor Phase Butylation Of Phenol, Nathan Lewis Zutty
The Catalytic Vapor Phase Butylation Of Phenol, Nathan Lewis Zutty
Honors Theses
The purpose of this experiment is to study the reaction between secondary butyl alcohol and phenol in the vapor phase. The effect of temperature upon the formation of different butyl phenols and butyl phenyl ethers was observed.
Properties Of Cement Acid Gels, Charles Ansel Suter
Properties Of Cement Acid Gels, Charles Ansel Suter
Honors Theses
This thesis summarizes the research conducted during the period June 1953-June 1954 under the research fellowship established in the Department of Chemistry at Union College by the North American Cement Corporation.