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Articles 34231 - 34260 of 34505
Full-Text Articles in Physical Sciences and Mathematics
Co-Precipitation Of Manganese With Calcium Phosphate, Joseph Francis Collins
Co-Precipitation Of Manganese With Calcium Phosphate, Joseph Francis Collins
Honors Theses
This investigation was undertaken to study, in a preliminary way, the effect of precipitating tricalcium phosphate in the presence of manganous salts. Certain facts in relation to manganese deficiency in the diet of fowls, giving rise to perosis, makes the problem of interest in view of the work carried out at the Agricultural Experiment Station at Colorado State College. (3). It has been known for a long time that a diet high in calcium produces perosis which can be corrected by peritoneal injection of manganese. (1). C. D. Caskey and L. C. Norris (2) have found that in the presence …
A Study Of The Formation Of Gels Of Hydrated Zirconia, Walter Addison Fallon
A Study Of The Formation Of Gels Of Hydrated Zirconia, Walter Addison Fallon
Honors Theses
As silica gels and titania gels have been prepared and studied, it seemed logical that this investigation could be extended to zirconia gels. It has been the purpose of this research to determine the conditions necessary for the formation of zirconia gels and to initiate the investigation of their characteristics.
The Viscosity Of Silicic Acid Gels, William George Gormley
The Viscosity Of Silicic Acid Gels, William George Gormley
Honors Theses
Gelation is that phenomenon in which the entire system of both dispersion medium and dispersed substances solidify into an apparently homogeneous, solid mass. Upon the assumption that a jelly consists of myriads of hydrous particles that have become enmeshed into a network that entrains liquids, it follows that any substance should form a jelly when a suitable amount of a highly dispersed substance is precipitated provided that the particles absorb the dispersing medium very strongly. The process of gelation differs macroscopically from flocculation in that flocculation presents a separation of the dispersed substance. It has been proposed that gelation is …
Elasticity Of Silicic Acid Gel, Frederick Searles Clum
Elasticity Of Silicic Acid Gel, Frederick Searles Clum
Honors Theses
When Robert Hooke published the “Description of Heliscopen” in 1676 the quotation above appeared on page 31 – translated – “The power of any spring is in the same proportion with the tension therein.” He formulated his theory from experimental results. It remained for Young, nearly a century and a half later, to interpret Hooke’s results in the generalized sense known today. Young defined the modulus, now known by his name, as the ratio of the force, causing elongation or compression, over the increment of expansion or contraction produced by it. When a proportion of matter is under the influence …
The Thermal Dissociation Of Barium Hydride, Edward Rynex Kane
The Thermal Dissociation Of Barium Hydride, Edward Rynex Kane
Honors Theses
For the past fifteen years rather extensive investigations have been carried on in this laboratory concerning the thermal dissociation of the hydrides of the alkaline earth metals. During this oeruid considerable time has been spent in devising suitable apparatus for the work and improved methods of procedure. Each successive worker on the problem in this laboratory has contributed materially to some phase of the investigations, or at least suggested from his experience improvements to be made in existing methods.It is however, unfortuneate that, because of the nature of the course in which these investigations have been undertaken, time for research …
Dialysis Of Silicic Acid, Paul L. Merz
Dialysis Of Silicic Acid, Paul L. Merz
Honors Theses
This research was a quantative study of the polymerization of silicic acid molecules which occurred during the process of gel formation by the means of dialysis. The condensation of the silicic acid molecules, Si(OH)4, to form larger molecules of colloidal size, as suggested by the polysilicic acid fibriller theory, was investigated with membrances of known pore size at various stages of the reaction. Although filter and membrane action is only to a limited extent comparable with the action of a sieve, and is much more dependent on the absorption in the capillaries than the size of the pores, still a …
A Study Of Electromotive Force Over A Concentration Gradient, Sherman William Parry
A Study Of Electromotive Force Over A Concentration Gradient, Sherman William Parry
Honors Theses
The problem was entered into to find out whether a gradual change of concentration over a distance of some centimeters would make any change in the electromotive force if substituted for a relatively sharp junction.
A Study Of The Physical Properties Of Bromopicrin And A Preliminary Investigation Of Its Reaction In Liquid Ammonia, George Bailey Stone
A Study Of The Physical Properties Of Bromopicrin And A Preliminary Investigation Of Its Reaction In Liquid Ammonia, George Bailey Stone
Honors Theses
The density and the index of refraction of bromopicrin were verified. New values were determined for the vapor pressure and the melting point. The surface tension and the viscosity were measured for the first time.
Prevention Of Bleeding By Coating Of The Pigment Particles, Angelo James Sederis
Prevention Of Bleeding By Coating Of The Pigment Particles, Angelo James Sederis
Honors Theses
The problem, essentially, is to conceive of a treatment which such a pigment could be given that will render it insoluble in those mediums in which it bleeds, without changing its characteristics in some other respect or making it so costly to manufacture that it would be impractical.
Transmission And Scattering Of Light By Silicic Acid Gel-Forming Mixtures, Warren De Sorbo
Transmission And Scattering Of Light By Silicic Acid Gel-Forming Mixtures, Warren De Sorbo
Honors Theses
In this investigation the transmission and scattering of light by the silicic acid gel forming mixtures have been studies during the process of gel formation in an effort to extend the work already done in this laboratory on the structure of silicic acid gels. The intensity of the transmitted and scattered light had been measured in terms of galvanometer deflections using a photoelectric tube circuit. An attempt had been made to utilize these results in elucidating the changes in size and number of the colloidal particles which take place in gel formation.
The Effect Of Silicia Concentration On The Time Of Set Of Constant Ph, Walter Otto Gerber
The Effect Of Silicia Concentration On The Time Of Set Of Constant Ph, Walter Otto Gerber
Honors Theses
When an aqueous solution of sodium silicate is treated with an acid, the mixture will become increasingly viscous and opalescent, and will finally set, it the silica concentration exceeds 2% and if the gel is not too acid or too alkaline. The time of set is determined by the pH, concentration of silica, concentration of certain foreign substances and the temperature.
A Study Of The Electrical Conductivity Of Glass, Raymond William Barclay
A Study Of The Electrical Conductivity Of Glass, Raymond William Barclay
Honors Theses
In past years, research has been done at Union College and other places on the electrical conductivity of glass. However, there seems to be a need of more quantitative work done on the subject. The purpose of this research is to give a deeper insight into the process; in particular, to investigate how the conductivity is affected by the replacement of sodium ions of the glass by various other ions.
Spectroscopic And Quantitative Determination Of Platinum, John W. Manning Iii
Spectroscopic And Quantitative Determination Of Platinum, John W. Manning Iii
Chemistry Honors Papers
This 7 page thesis examines quantitative method and spectroscopic analysis of platinum.
The Preparation Of Methyl, Ethyl, And Borneol Glucoside, Florence Margaret Berger
The Preparation Of Methyl, Ethyl, And Borneol Glucoside, Florence Margaret Berger
Bachelors’ Theses
The present research was undertaken to find methods suitable for the preparation of methyl, ethyl, and borneol glucoside. The problem was to prepare methyl, ethyl, and borneol glucoside, and to determine their constants in regard to the melting point and optical rotation. These results were then compared to the results obtained by Emil Fischer and J. Hamalaienen.
Applications Of Artificial Radioactivity To Problems In Chemistry, D. E. Hull
Applications Of Artificial Radioactivity To Problems In Chemistry, D. E. Hull
Journal of the Minnesota Academy of Science
No abstract provided.
The Biological Use Of The Stable Mass Isotopes, Allan Hemingway
The Biological Use Of The Stable Mass Isotopes, Allan Hemingway
Journal of the Minnesota Academy of Science
No abstract provided.
A Study Of The Photoelectric Properties Of Solutions Of Potassium In Liquid Ammonia, Adam S. Kowalczyk
A Study Of The Photoelectric Properties Of Solutions Of Potassium In Liquid Ammonia, Adam S. Kowalczyk
Master's Theses
No abstract provided.
A Study Of The Equilibrium Diagrams Of The Systems, Benzene-Toluene And Benzene-Ethylbenzene, John B. Mullen
A Study Of The Equilibrium Diagrams Of The Systems, Benzene-Toluene And Benzene-Ethylbenzene, John B. Mullen
Master's Theses
No abstract provided.
An Apparatus For Molecular Weight Determinations, Philip A. Lefrancois
An Apparatus For Molecular Weight Determinations, Philip A. Lefrancois
Master's Theses
No abstract provided.
The Kinetics Of The Decomposition Of Ethyl-Chlorocarbonate., George Francis Kirby
The Kinetics Of The Decomposition Of Ethyl-Chlorocarbonate., George Francis Kirby
LSU Historical Dissertations and Theses
No abstract provided.
An Experimental Study Of The Equilibrium Diagrams Of Two Binary Systems: Acetic Acid-Water And Glycolic Acid-Water, Lucille Mary Trudeau
An Experimental Study Of The Equilibrium Diagrams Of Two Binary Systems: Acetic Acid-Water And Glycolic Acid-Water, Lucille Mary Trudeau
Master's Theses
No abstract provided.
The Volumetric Determination Of Alumina In Clays And Related Materials, David Ferdinand Boltz
The Volumetric Determination Of Alumina In Clays And Related Materials, David Ferdinand Boltz
Masters Theses
"The primary purpose of this thesis was to develop a direct method for the determination of alumina in certain silicates. The classical gravimetric procedure for the analysis of alumina in clays and related materials has often been regarded as being too lengthy and troublesome, especially when only the percentage of alumina was desired. The correct determination of alumina is undoubtedly one of the most unsatisfactory of the chemical constituents of siliceous materials, and therefore the development of a direct volumetric method for the determination of this constituent was made the main objective of this research, page [1].
An Experimental Study Of The Equilibrium Diagrams Of Two Binary Systems: Benzene-Anisole And Benzene-Benzyl Alcohol, Otto Joseph Richiardi
An Experimental Study Of The Equilibrium Diagrams Of Two Binary Systems: Benzene-Anisole And Benzene-Benzyl Alcohol, Otto Joseph Richiardi
Master's Theses
No abstract provided.
A Study Of The True Fermentable Substances In Grain And The Development Of A Rapid Method For The Determination Of Pentosans., Marjorie M. Laning 1916-2010
A Study Of The True Fermentable Substances In Grain And The Development Of A Rapid Method For The Determination Of Pentosans., Marjorie M. Laning 1916-2010
Electronic Theses and Dissertations
No abstract provided.
Electrolytic Reduction Of Galena In Fused Salt, Peter Simonds
Electrolytic Reduction Of Galena In Fused Salt, Peter Simonds
Masters Theses
"A demand has long existed for a method of directly recovering elemental Sulphur, in addition to the Lead, from Galena ore. At the present time, the sulphur of this ore is dissipated in the lead blast furnace as sulphur dioxide fumes. While the fumes are trapped to avoid damage to the vegetation of the surrounding countryside, their concentration is usually too low to make sulphuric acid as a profitable by-product. Thus, contrary to some speculation, the sulphuric acid produces under the circumstances is usually not a true by-product in the money-making sense of the term in many cases, but a …
An Experimental Study Of Equilibrium Diagrams Of The Systems: Benzene-Chlorbenzene And Benzene-Fluorobenzene, John C. Tomunak
An Experimental Study Of Equilibrium Diagrams Of The Systems: Benzene-Chlorbenzene And Benzene-Fluorobenzene, John C. Tomunak
Master's Theses
No abstract provided.
Studies Of Hydrolysis Effects Upon Soil Colloids., Jack Ezelle Simpson
Studies Of Hydrolysis Effects Upon Soil Colloids., Jack Ezelle Simpson
LSU Historical Dissertations and Theses
No abstract provided.
A Study Of The Properties Of Sodium - Calcium Saturated Clays., Maurice Mccall Vick
A Study Of The Properties Of Sodium - Calcium Saturated Clays., Maurice Mccall Vick
LSU Historical Dissertations and Theses
No abstract provided.
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.
Consumption And Uses Of Crude Barite And Its Derivatives, Peter Simonds
Consumption And Uses Of Crude Barite And Its Derivatives, Peter Simonds
Masters Theses
"Barite is a widely distributed mineral composed of barium sulphate - BaSO₄. Its most striking feature is its weight - its specific gravity of 4.5 being about twice that of salt and many other of the colorless, transparent and vitreous minerals of its general appearance. The Mineral is usually found in a state of considerable chemical purity. However, small amounts of strontium and calcium sulphates may isomorphously replace the barium salt. Crystals of barytes are orthorhombic; usually very perfectly developed and have a wide variety of forms. The simplest crystals are rhomb-shaped tables bounded by two faces of a basal …