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Articles 691 - 698 of 698
Full-Text Articles in Physical Sciences and Mathematics
An Investigation Of The Reduction Of Carbon-Carbon Unsaturation By Alkali Metals In Liquid Ammonia, Donald Richard Larkin
An Investigation Of The Reduction Of Carbon-Carbon Unsaturation By Alkali Metals In Liquid Ammonia, Donald Richard Larkin
Doctoral Dissertations
Introduction: The properties of liquid ammonia are similar in many ways to those of water. Liquid ammonia has the very high specific heat of 1.10 calories per gram. Hydrogen bonding occurs to a considerable degree although not as extensively as in water. Evidence of hydrogen bonding as reflected in boiling points is shown in Table I. The dielectric constant is 22 at -33° which is also very high for a solvent which is comparatively inert to reactive metals. (Hexane has a dielectric constant of 1.87.) Liquid ammonia is a much better solvent for organic compounds than water. Even such large …
Preparation Of Compounds Of Potential Physiological Activity: Derivatives Of Benzilic, Substituted Acetic And Substituted Glycolic Acids And Substituted Butanones, Thomas Alexander Magee
Preparation Of Compounds Of Potential Physiological Activity: Derivatives Of Benzilic, Substituted Acetic And Substituted Glycolic Acids And Substituted Butanones, Thomas Alexander Magee
Doctoral Dissertations
The continuing search of chemists, physiologists and medical researchers for natural and synthetic compounds which will alleviate or cure the illnesses of mankind constitutes a fascinating episode in the history of scientific endeavor. One chapter of this history is necessarily concerned with efforts to synthesize better, more useful antispasmodics. To present a comprehensive critical review of these efforts would require an extensive treatise and will not be attempted here. Several reviews are available which cover the literature to around 1950. The present survey will be a brief resume of the more pertinent material to the present time. It is hoped …
An Investigation Of Techniques For The Separation Of Hydrogen And Deuterium: Part I: Zone Refining Of Mixtures Of Ordinary And Heavy Water; Part Ii: The Reaction Of Iron With Mixtures Of Ordinary And Heavy Water; Part Iii: Gas Chromatography With Hydrogen And Deuterium Samples, Carl Owens Thomas
Doctoral Dissertations
The separation factor for a single fractional crystallization in the H2O-D2O system is much too small, and the required freezing rate is too slow for a batch process to give a useful separation of the isotopic forms of water. The purpose of this work was to continue some preliminary experiments on zone refining in the H2O-D2O system and to attempt to determine whether or not the technique would be useful for the separation of heavy water from ordinary water.
Some Properties Of Surface Films Formed By Adsorption Of N-Nonadecanoic Acid On Mechanically Activated Metal Surfaces, Tomlinson Fort Jr.
Some Properties Of Surface Films Formed By Adsorption Of N-Nonadecanoic Acid On Mechanically Activated Metal Surfaces, Tomlinson Fort Jr.
Doctoral Dissertations
The Problem: The work reported here is concerned with the adsorption of n-nonadecanoic acid onto freshly machined metal surfaces. The work done is a direct continuation of that begun by Smith and Allen and continued by McGill whose experimental techniques have largely been adopted. The investigation involves the adsorption of a typical polar organic molecule onto "clean" metal surfaces, prepared under rather rigidly controlled and unique conditions in a system from which the usual surface contaminants are believed to be absent. The purpose of these studies is to gain some insight into the properties of metal surfaces themselves, the …
A Study Of The Catalytic Hydrogenation Of Methoxybenzenes Over Platinum And Rhodium Catalysts, Robert Gene Thompson
A Study Of The Catalytic Hydrogenation Of Methoxybenzenes Over Platinum And Rhodium Catalysts, Robert Gene Thompson
Doctoral Dissertations
[From the Summary]
The catalytic hydrogenation of methoxybenzenes and other aromatic methoxyl compounds has been studied. Hydrogenation of the aromatic ring was usually accompanied by some cleavage of the methoxyl groups. This cleavage occurred predominately upon the carbon-oxygen bond adjacent to the aromatic ring. The cleavage reaction was found to occur only as a part of the aromatic hydrogenation process. The amount of cleavage was found to be dependent upon the catalyst used. Platinum led to extensive methoxyl cleavage while rhodium catalyzed ring saturation with little cleavage. Also found to influence the extent of cleavage were reaction temperature …
The Thermodynamics Of Technetium And Its Compounds, James W. Cobble
The Thermodynamics Of Technetium And Its Compounds, James W. Cobble
Doctoral Dissertations
No abstract provided.
The Synthesis And Pharmacologic Activity Of Some Bis-(2-Aminoethyl)-Benzenes, Ching Chen Tung
The Synthesis And Pharmacologic Activity Of Some Bis-(2-Aminoethyl)-Benzenes, Ching Chen Tung
Doctoral Dissertations
Introduction: The isolation of epinephrine from the medulla of the suprarenal gland and the discovery of its amazing therapeutic effects have stimulated intensive research on the synthesis of compounds possessing the basic skeleton of 2-aminoethyl-benzene. The investigation in the past forty years have culminated in the preparation of a large number of this type of amine which are pharmacologically classified as "sympatho-mimetic" or "pressor" agents because they generally act on the sympathetic nervous system and cause in increase of blood pressure. However, the 2-aminoethylbenzene derivatives most thoroughly studied have been those whose molecules possessed only one aminoethyl side chain per …
Pyrochemical Changes In Missouri Halloysite, Frank Joseph Zvanut
Pyrochemical Changes In Missouri Halloysite, Frank Joseph Zvanut
Doctoral Dissertations
"For centuries it has been known that the application of heat to a clay or a clay body produces changes that make it an entirely different substance from the original raw clay. Ever since the earliest civilizations produced crude building brick by baking formed clay bodies in the sun's rays, mankind has been speculating on the nature of the changes that convert soft, friable, plastic clays into hard, strong, non-plastic, rock-like masses. It has been only within the last two decades, however, that progress has been made in the solution of problems dealing with the resultant products in fired clay …