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Articles 12031 - 12060 of 12325
Full-Text Articles in Physical Sciences and Mathematics
A Spectral Study Of Some Deuterated Toluenes., Charles Hooper Smith
A Spectral Study Of Some Deuterated Toluenes., Charles Hooper Smith
LSU Historical Dissertations and Theses
No abstract provided.
The Separation Of The Rare Earths Neodymium And Praseodymium By Precipitation As Chloride, Stanley Milton Kulifay
The Separation Of The Rare Earths Neodymium And Praseodymium By Precipitation As Chloride, Stanley Milton Kulifay
Masters Theses
"The purpose of this thesis is to provide a means of preparing highly purified samples of neodymium and praseodymium compounds when the material to be refined already exists in a state of approximate purity. The method described cannot be profitably used to purify the individual rare earths without first concentrating them. The process is not intended to be quantitative, for it is a fractional crystallization technique using a concentrated hydrochloric acid medium"--Introduction, page 1.
An Investigation Of The Colorimetric Methods For The Determination Of Fluorine By The Zirconium Alizarin Sulfonate Method, William Lewis Break
An Investigation Of The Colorimetric Methods For The Determination Of Fluorine By The Zirconium Alizarin Sulfonate Method, William Lewis Break
Masters Theses
"There has been a need for a rapid and an accurate method for the determination of fluorine in its compounds. Both gravimetric and volumetric methods have been studied, but both methods were time consuming or inaccurate or both. Colorimetric methods had been studied before F. Richter developed his method but none had been reported to be as satisfactory as his method. This method was investigated because it was thought that F. Richter's method would be a satisfactory colorimetric determination for fluorine in its compounds"--Introduction, page 1.
Crude Oil Salts In Petroleum Refining., Thomas Porter Bailey 1914-2001
Crude Oil Salts In Petroleum Refining., Thomas Porter Bailey 1914-2001
Electronic Theses and Dissertations
No abstract provided.
A Study Of The Synthesis Of 4-Chlorobutanal., Carl E. Moore 1915-2012
A Study Of The Synthesis Of 4-Chlorobutanal., Carl E. Moore 1915-2012
Electronic Theses and Dissertations
No abstract provided.
Studies In The Determination Of Iodine In Soils Organic Materials, And Waters, Russell T. Lundell
Studies In The Determination Of Iodine In Soils Organic Materials, And Waters, Russell T. Lundell
Theses and Dissertations
A summary of the literature on the nutritional value of iodine in the diet of various forms of life is given. The majority of evidence indicates that iodine is an essential element in plant and animal nutrition. It functions particularly in animal metabolism in the form of thyroxine. The occurrence of iodine in a nature has been briefly discussed. Investigations made in this regard indicate iodine to be almost universally distributed in very minute amounts. Most iodine salts are soluble in water and their distribution is affected by water movements. Results of iodine determinations made during the course of this …
The Effect Of Sodium And Potassium Ions On The Time Of Set Of Silicic Acid Gels, Orin Chester Hansen
The Effect Of Sodium And Potassium Ions On The Time Of Set Of Silicic Acid Gels, Orin Chester Hansen
Honors Theses
This paper will deal with the relative effect of the potassium and sodium ions on the time of set. To determine this effect, gels were prepared using potassium silicate in place of the sodium silicate used in the previous experiments on the effects of electrolytes in this laboratory. The heat of activation for the setting of the potassium silicate gels was determined by the method used by Hurd and Letterton (7) in which the logarithm of the time of set was plotted against the reciprocal absolute temperature, the heat of activation being computed from the slope of the resulting line …
The Effect Of Polyvalent Electrolytes On The Viscosity Of Silicic Acid Gel Mixtures, David John Gimber
The Effect Of Polyvalent Electrolytes On The Viscosity Of Silicic Acid Gel Mixtures, David John Gimber
Honors Theses
Von Weimarn has shown that the degree of supersaturation at the time of formation, and the viscosity of the medium account, qualitatively at least, for the resulting character of the precipitate from a solution, whether it be crystalline of amorphous. When fairly concentrated solutions form precipitates they are usually colloidal in nature and may even be gelatinous, or a jelly may be formed. When a precipitate, thus formed, retains an appreciable quantity of the liquid in which it was dissolved in the form of a semi-rigid mass, it is termed a “gelatinous precipitate”, and if all the liquid is initially …
Degree Of Substitution In Ethylchlorosilanes, Charles Guare
Degree Of Substitution In Ethylchlorosilanes, Charles Guare
Honors Theses
When an organo-magnesium halide is reacted with an excess of trichlorosilane, a mixture of products results according to the equations. If phenyl magnesium bromide is used, a mixture of high boiling products results, the highest boiling point of which is approximately 250° at 14mm. pressure. If ethyl magnesium bromide is used, it may be shown that, making certain assumptions and under the conditions of the experiment, if ethyl magnesium bromide is added to the trichlorosilane, monosubstitution is promoted, whereas if the trichlorosilane is added to the ethyl magnesium bromide, polysubstitution is promoted.
Heats Of Solution In Liquid Ammonia, Merwin William Warren
Heats Of Solution In Liquid Ammonia, Merwin William Warren
Honors Theses
The present work consists in measurements of the integral heat of solution of dimethylamine hydrochloride, and its isomer, ethyl ammomium chloride, and preliminary measurements on phenyl-amine hydrochloride.
Application Of The Cathode Ray Oscillograph To Polarographic Analysis, George Sidney Wooster
Application Of The Cathode Ray Oscillograph To Polarographic Analysis, George Sidney Wooster
Honors Theses
The object of this work is to devise a method of reproducing on a cathode ray oscillograph the current-voltage curves that are obtained with the Fisher Electropode, and from these curves determine directly the half-wave potentials of the elements present in a test solution. This test solution is composed of copper, lead, cadmium, and zinc ions in a supporting electrolyte of .1 normal k C1.
Dialysis Of Silicic Acid, Frank Witzel
Dialysis Of Silicic Acid, Frank Witzel
Honors Theses
There were two objectives in carrying out this investigation. To lend more evidence to the establishment of the polysilicic theory. To investigate the possibilities of using a colorimetric analysis for the determination of relatively large amounts of silica.
Thermochemical Studies Of Special Propellants., Frederick C. Damm
Thermochemical Studies Of Special Propellants., Frederick C. Damm
Electronic Theses and Dissertations
No abstract provided.
A Study Of Form And Content For A Laboratory Manual To Be Used By Students In General Chemistry Laboratory, Berne P. Broadbent
A Study Of Form And Content For A Laboratory Manual To Be Used By Students In General Chemistry Laboratory, Berne P. Broadbent
Theses and Dissertations
This investigation was carried out for general chemistry classes in which recitation and laboratory work are closely integrated and in which very close supervision is given to laboratory classes. Results indicate that there are fewer failures under these conditions if students do individual work. Students receiving grades of over 80% seem to work just as effectively in pairs as they do when working individually, but about 5% who fail when working in pairs could, apparently obtain grades above 60% if they did individual work. The formal full statement type of report is substantially more effective than the questionaire report as …
The Preparation And Rate Of Hydrolysis Of Glucosides, Thomas William Fair
The Preparation And Rate Of Hydrolysis Of Glucosides, Thomas William Fair
Honors Theses
The term glucoside has been applied to those compounds which have the property of supplying, upon hydrolysis, a sugar and one or more other products. Nearly all organic compounds which occur in plants (fruit, bark, roots) are in combination with a sugar. They all resemble the simple methyl glucosides. In many cases, the glucoside form is more soluble than the substance itself. Naturally occurring glucosides are prepared by extracting from the plant, by means of a solvent such as water or alcohol. Glucosides are synthesized (generally) from the non-saccharide constituent and acetobromoglucose in the presence of AgO or Ag2CO3. The …
The Effect Of Chlorides Upon The Time Of Set Of Silicic Acid Gels, Leon F. Wardell
The Effect Of Chlorides Upon The Time Of Set Of Silicic Acid Gels, Leon F. Wardell
Honors Theses
The purpose of this research was to undertake the investigation of the effect of extra quantities of electrolytes, particularly those of divalent cations, upon the time of set of silicic acid gels, keeping in mind any effect the added electrolyte might have upon the solution's pH. The silicic acid gels studies were prepared by the method suggested by Hurd.
The Cleavage Of Cyclo-Beta-Diketones. I. Tetramethyl-1,3-Cyclobutanedione. Ii. Tetraphenyl-1,3-Cyclobutanedione., Garry Carlton Kitchens
The Cleavage Of Cyclo-Beta-Diketones. I. Tetramethyl-1,3-Cyclobutanedione. Ii. Tetraphenyl-1,3-Cyclobutanedione., Garry Carlton Kitchens
LSU Historical Dissertations and Theses
No abstract provided.
A Study Of Factors Influencing The Hydrolysis Of Corn Amylopectin By Barley Malt Enzymes., Thelma Munsey Back 1918-2006
A Study Of Factors Influencing The Hydrolysis Of Corn Amylopectin By Barley Malt Enzymes., Thelma Munsey Back 1918-2006
Electronic Theses and Dissertations
No abstract provided.
Occupational Chemical Hazards In Industries Of Louisville And Jefferson County., Morgan Brown Lewman
Occupational Chemical Hazards In Industries Of Louisville And Jefferson County., Morgan Brown Lewman
Electronic Theses and Dissertations
The facts and conclusions presented in the following pages are the results of figures gathered during two and one half years of work as an Industrial Hygiene Engineer for the Louisville and Jefferson County Health Department. The factual information was acquired from many sources including extensive reading to which reference is made of the more recent publications in the bibliography and also from correspondence and discussions with authorities in various fields. Much data was gained from "in-service training" received at the United States Public Health Service; Bureau of Industrial Hygiene, Bethesda, Maryland; University of Michigan; National Conference of Governmental Industrial …
Synthesis Of Dyes, Faith B. Cramer
Synthesis Of Dyes, Faith B. Cramer
Chemistry Honors Papers
This 14 page thesis examines the classification and preparation of dyes.
The Relation Between Viscosity And Silica Concentration Of Silicic Acid Gels, Jules David Viglielmo
The Relation Between Viscosity And Silica Concentration Of Silicic Acid Gels, Jules David Viglielmo
Honors Theses
In this work we have again been concerned with the silica concentration but have elected to use viscosity measurements as a means of studying the process of gelation rather than the former method used by Hurd and Schaffer. As pointed out by Hurd and Santora, who use the viscometer in studying the effect of added electrolytes the process of gelation may in this way be observed.
Preparation Of Certain Purine Thiocyanate Complexes, Robert Wallace Carter
Preparation Of Certain Purine Thiocyanate Complexes, Robert Wallace Carter
Honors Theses
As the purine group of compounds is known to exert a stimulative effect on the heart, the object of this research was to prepare certain compounds of the purine group for possible use in cardiotherapy. However, a serious rise in blood pressure often accompanies the use of these compounds, it would be desirable to combine them with some compound which would dilate the blood vessels.
A Study Of Mixed Hydrogels Of Titania And Zirconia, James Borst Bouck
A Study Of Mixed Hydrogels Of Titania And Zirconia, James Borst Bouck
Honors Theses
Hydrogels of titania, formed by addition of bases to acid solutions of titanium salts, have been known since Rose's work in 1823. Hydrogels of zirconia have been prepared and investigated by several workers. These hydrogels of titania and zirconia are both acid gels, that is, they are formed at pH's considerably less than 7.
Measurement Of Dielectric Constants, Francis Andrew Czech
Measurement Of Dielectric Constants, Francis Andrew Czech
Honors Theses
The increasing importance of a knowledge of dielectric constants of substances is shown by the large number of measurements that have appeared in recent literature- Several methods have been used in making these measurements, but probably the most precise ate the methods based on the heterodyne beat principle. This apparatus is designed to measure substances that are non-conducting. The condition of constant capacitance in the measuring circuit is the principle of the apparatus and is detected by the beat note between a fixed crystal radio frequency oscillator and oscillations generated by a variable oscillator. Otto and Wenzke (6) have used …
Synthesis Of Complexes Of Potassium Thiocyanate With Thiourea And Biurnet, Barclay Belding Fishburn
Synthesis Of Complexes Of Potassium Thiocyanate With Thiourea And Biurnet, Barclay Belding Fishburn
Honors Theses
The main objective of the work was an attempt to prepare certain compounds of the purine group for possible use in cardio-therapy, since the purine group is known to exert a stimulating action on the heart. However, under certain conditions these compounds cause a serious rise in blood pressure. It was thought that perhaps some compound which would produce dilation of the blood vessels could be combined with the purine group, to give a compound which would have the stimulative property, and in which the rise in blood pressure would be absent or at least minimized. Since such a type …
A Preliminary Polarographic Investigation Of Hydrogen Bonding - The Ortho- And Para- Hydroxy Benzaldehydes, Edwin Gerald Newstead
A Preliminary Polarographic Investigation Of Hydrogen Bonding - The Ortho- And Para- Hydroxy Benzaldehydes, Edwin Gerald Newstead
Honors Theses
The polagraphic method should be able to determine the presence of hydrogen bonds in ortho-hydroxy benzaldehyde in carefully buffered water solutions. The wave-height for the reduction of ortho-hydroxy benzaldehyde in acid solution is about one-half the height in basic solution. This would seem to indicate that the intermediate reduction product is formed by the reduction of ortho-hydroxy benzaldehyde in acid medium. This intermediate is stabilized by the presence of a hydrogen bond, so that further reduction to the hydroxy benzyl alcohol is not possible at the dropping mercury electrode.
An Investigation Of The Reaction Of Bromopicrin With Liquid Ammonia, Seymour L. Meisel
An Investigation Of The Reaction Of Bromopicrin With Liquid Ammonia, Seymour L. Meisel
Honors Theses
The purpose of this research was to study the reaction between bromopicrin, also referred to as nitro-bromoform or tribromomonitromethane, with liquid ammonia. It seems surprising, but very little has been done on the reaction between these halogen nitro derivatives of methane and liquid ammonia.
Spectrophotometric Determinations Of The Sulfonamides, Paul William Brna
Spectrophotometric Determinations Of The Sulfonamides, Paul William Brna
Master's Theses
No abstract provided.
The Determination Of Small Amounts Of Carbon Monoxide In Air, Edward J. Fitzsimons
The Determination Of Small Amounts Of Carbon Monoxide In Air, Edward J. Fitzsimons
Master's Theses
No abstract provided.
A Spectrophotometric Study Of The Solution Of Iodine In Aqueous Potassium Iodide, Joseph L. Schneider
A Spectrophotometric Study Of The Solution Of Iodine In Aqueous Potassium Iodide, Joseph L. Schneider
Master's Theses
No abstract provided.