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Articles 3601 - 3618 of 3618
Full-Text Articles in Chemistry
A Comparison Between Saponification And Iodine Values And Melting Point Curves For Mixtures Of Various Natural Waxes And Halowax 1012, William Kenneth Watts
A Comparison Between Saponification And Iodine Values And Melting Point Curves For Mixtures Of Various Natural Waxes And Halowax 1012, William Kenneth Watts
Bachelors’ Theses
This thesis 1s concerned with the nature of the action of the lowering of the melting point of the various natural waxes by the addition of Halowax. The problem was suggested by the work of Louis Kroening in his thesis, "The Effect of Halowax 1012, 1013, and 1014 on the Melting Points of the Various Waxes", and also by that of Joseph M. Sevenich in his thesis, "An Investigation of Halowaxes in Trinary Wax Mixtures". The former showed conclusively that the presence of Halowax in a wax mixture invariably lowered the melting point of the natural wax. The latter showed …
A Study Of The Kjeldahl Method And A Modification For The Determination Of Nitrogen In Alcoholic Distillates., Margie M. Miller
A Study Of The Kjeldahl Method And A Modification For The Determination Of Nitrogen In Alcoholic Distillates., Margie M. Miller
Electronic Theses and Dissertations
No abstract provided.
A Study Of The Proteolytic Activity Of The Enzyme Papain On Various Brands Of Gelatine, Mary Christella Zeszuto
A Study Of The Proteolytic Activity Of The Enzyme Papain On Various Brands Of Gelatine, Mary Christella Zeszuto
Bachelors’ Theses
The measurement of the ·viscosity of liquids by means of capillary tubes has been carried on for more than a hundred years. It was not, however, until 1846 that the results of Poiseuille's research were given to the public. For the comprehensive study he made of the problem, the concept of the laws controlling viscometry flow is attributed to him. The study of the same problem. was continued by many others in subsequent years. Their results, in general, verify the principles given by Poiseuille, but corrections attributed to conditions other than viscous flow have been suggested. These involve drainage, liquid …
A Method For Comparing And Measuring The Drying Time Of Glues, William C. Strutz
A Method For Comparing And Measuring The Drying Time Of Glues, William C. Strutz
Bachelors’ Theses
The measurements or quality in glue testing are arbitrary and are of value only when compared to a standard glue or when comparing one glue to another. Glues have been used for hundreds of years, but it has been only in the last forty or fifty years that any scientific investigations of any consequence have been made. Prior to this time glues were made by rule of thumb by practical men who learned the art of glue making from other practical men in the business and by contact with the industry. "When the United States entered the Great War and …
A Study Of The Gelation Of Several Paraffins In Various Solutions, Joseph John Wocasek
A Study Of The Gelation Of Several Paraffins In Various Solutions, Joseph John Wocasek
Bachelors’ Theses
In the selection of various waxes for commercial use, it has long been the custom to depend solely upon melting-point for property determination. Thus, for example, all paraffin waxes which had a melting range between 50 and 65 degrees centigrade, were thought to have much the same properties and that any or the commercial paraffins of this range would therefore impart the same characteristics to the product in which they were to be used. But with increased use, these waxes have come under more careful observation and experimentation. Very little data has as yet been released for publication but already …
A Study Of The Products Of The Reaction Between Stannous And Arsenate Ions In Silicic Acid Gels, Frank K. Thompson
A Study Of The Products Of The Reaction Between Stannous And Arsenate Ions In Silicic Acid Gels, Frank K. Thompson
University of the Pacific Theses and Dissertations
The fact that characteristic crystalline products result upon the diffusion of arsenate ions into silicic acid gel which has been impregnated with stannous ions has been known by the Pacific Chemistry Department for some time. The optimum conditions with regards to heat and hydrogen ion concentration have been determined. The purpose of this investigation was to study the products of the reaction. First to determine whether or not the silicic acid itself combined with the stannous and arsenate. ions in the formation of the crystalline product, and second to determine its chemical composition.
The Effect Of Ultra-Violet Light On Ethyl Acetate, Homer W. Wiesner
The Effect Of Ultra-Violet Light On Ethyl Acetate, Homer W. Wiesner
Bachelors’ Theses
The present work, is a study of the effect of ultraviolet light on pure organic compounds. In particular, it is a qualitative and quantitative study of_ the decomposition products of ethyl acetate as effected by ultraviolet radiations, together with the development of experimental apparatus. In as much as the work required special apparatus, much of the time was spent in the development and construction of such apparatus.
A Study Of The Cooling Curve Of Several Waxes And Various Binary Mixtures Of These Waxes, Casimir A. Smyk
A Study Of The Cooling Curve Of Several Waxes And Various Binary Mixtures Of These Waxes, Casimir A. Smyk
Bachelors’ Theses
A cooling curve may be defined as a graphic representation of the relationship which exists in the elapse of time and temperature of a substance surrounded by a medium of a temperature lower than itself. There is no heat added to the substance and the only heat taken away from the substance is by means of the surrounding medium. It is time plotted against temperature. Time on the x-axis and temperature on the y-axis. Many methods have been mentioned for the determination of purity and identification of a wax. But the methods are not standardized because of the length and …
Wax Analysis With Special Reference To Montan, Spermaceti, And Chinese Insect Wax, Margaret M. Plonsker, Margaret E. Seippel
Wax Analysis With Special Reference To Montan, Spermaceti, And Chinese Insect Wax, Margaret M. Plonsker, Margaret E. Seippel
Bachelors’ Theses
The presentation of this thesis under joint authorship finds its justification in the fact that much of the experimental work, though performed individually, is of such a nature as to warrant a unified description. In this way the reader is afforded a better representation and clearer conception of the problem, and a substantial guide for further investigation. Though much work has been done in the field of wax analysis, little is known of the higher fatty acids and alcohols of many of the waxes. Their isolation has been infrequent, and few if any of their derivatives have been formed. It …
The Electrodeposition Of Chromium And Iron Alloy, Duane J. Windau
The Electrodeposition Of Chromium And Iron Alloy, Duane J. Windau
Bachelors’ Theses
The plating of stainless steel, or more correctly, the plating of iron chromium alloys is among the recent projects undertaken by the steel industry to improve its products. Publications on this industrial endeavor are few, although undoubtedly there is considerable work going on. The reason for the sudden interest in stainless steel may be traced to the interesting and valuable properties of chromium steels and especially the stainless steels. However, articles made entirely of stainless steel are expensive and therefore cheaper substitutes have been considered, names the plating of a base metal with chrom-iron alloys. This project will be of …
Substitution Of Hydrofluoric Acid For Sulphuric Acid In Chromium Plating, Leonard Schulze
Substitution Of Hydrofluoric Acid For Sulphuric Acid In Chromium Plating, Leonard Schulze
Bachelors’ Theses
Chromium plating or the electrodeposition of chromium from chromic acid baths has been an accomplished fact for almost a century. However, it has not been until the last few years that considerable attributive information has been published to make the mechanism of the process sufficiently understood to permit its commercial operation.1 Most of the scientific information published on chromium plating thus far is general there being very little specific information revealed as yet. Material, as shall be referred to occasionally, may be read about its early successful applications stressing the unusual properties, advantages, interests, and activities but very little …
A Study Of The Plating Prohibitive Properties Of Various Separators, Bruno J. Pozorski
A Study Of The Plating Prohibitive Properties Of Various Separators, Bruno J. Pozorski
Bachelors’ Theses
The problem of this thesis is to study the plating prohibitive properties of the various materials commonly used in the manufacturing of separators, and to indicate which material would be most serviceable and feasible in a separator. At one time positives and negatives were kept not more than 0.25 inches apart, with the idea of reducing the intervening layers of electrolyte, and, therefore, the internal resistance of the cell, as much as possible. It was, however, found that the output could actually be increased by putting the plates at greater distances, the fact being that the larger bulk of solution …
Hardness And Porosity In Chromium Plating, Waldemar Wick
Hardness And Porosity In Chromium Plating, Waldemar Wick
Bachelors’ Theses
In recent years chromium plating has been subjected to much research due to its ever-increasing demand. The results of these investigations have demonstrated the valuable properties of this plate. Of its many advantageous properties, hardness is one of the outstanding ones, but its application in industry is as yet not fully realized. This being due to the fact that it is difficult to produce a plate that is uniform and does not chip. Many chemists have investigated the porosity of the chromium plate in order to produce a coating that could be used for protective purposes, but there seems to …
The Electro-Deposition Of The Binary System Copper-Cadmium., Allen Stratton Smith 1906-1966
The Electro-Deposition Of The Binary System Copper-Cadmium., Allen Stratton Smith 1906-1966
Electronic Theses and Dissertations
No abstract provided.
A Study Of Gel Formation In Kerosene In Contact With Sodium, Jerome M. Weller
A Study Of Gel Formation In Kerosene In Contact With Sodium, Jerome M. Weller
Bachelors’ Theses
The origin of the problem to be considered in this paper is traced to the observations of John R. Koob, Ph.D., Head of the Chemistry Department of Marquette University. It was his experience to note that the kerosene, in a bottle, containing cut sodium for the organic laboratory, had solidified to a gel, resembling Vaseline in appearance.
The Study Of The Effects Of Different Metallic Soaps On The Water Content Of Water-In-Gasoline Emulsions, Lynn D. Wilson
The Study Of The Effects Of Different Metallic Soaps On The Water Content Of Water-In-Gasoline Emulsions, Lynn D. Wilson
Bachelors’ Theses
The study of emulsions and emulsification is of very great theoretical and practical interest. From the standpoint of pure science it throws much light on the problems of surface tension, surface concentration, absorption, surface films, electrical double layers. Brownian movement, and the general theory of disperse systems and colloids. It is also of importance in biological science, e.g., the adsorption of fats and the permeability of membranes. When industrial and applied science are considered, it is remarkable how many subjects of interest and importance are dependent on a knowledge of the formation, behavior, and stability of emulsions. In this connection, …
A Critical Examination Of The Kjeldahl Method For The Determination Of Nitrogen, Edward F. Danforth
A Critical Examination Of The Kjeldahl Method For The Determination Of Nitrogen, Edward F. Danforth
Archived Theses and Dissertations
No abstract provided.
The Commercial Preparation Of Ammonium Nitrate From Ammonium Sulfate And Sodium Nitrate, Carl Emil Lauer
The Commercial Preparation Of Ammonium Nitrate From Ammonium Sulfate And Sodium Nitrate, Carl Emil Lauer
Archived Theses and Dissertations
No abstract provided.