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Articles 34651 - 34680 of 34709
Full-Text Articles in Physical Sciences and Mathematics
A Direct Reading Ionization Gauge For Pressure Measurement, A Calibration Of Standard Radio Tubes As Ionization Gauge, And A Determination Of The Vapor Pressure Curve For Solid Titanium Tetrachloride, Neil B. Reynolds
Honors Theses
.The work to be described in the following pages falls naturally under three distinct headings, and will, therefore, be taken up into three separate sections.
The work on the Direct Reading Ionization Gauge as performed under the direction of Mr. C. G. Found of the General Electric Research Company and is the subject of a paper by him and the author now in the hands of the editors of the Journal of the Optical Society of America and Review of Scientific Instruments. The remainder of the work reported here was done by the author at the Research Laboratory of the …
A Study Of The Electrical Conductivity Of Glass, William Worden Day
A Study Of The Electrical Conductivity Of Glass, William Worden Day
Honors Theses
This work was undertaken with the view of finding the alternating-current resistance of a specimen of soda-lime glass, and of determining how it changes with time, temperature, and amount of current passed. In all runs, we have restricted our work to the case of a one to one replacement of sodium ions for sodium ions by using a fused mixture of sodium-nitrate and sodium-nitrate as the electrolyte which makes contact to each side of the glass. Electrodes of both platinum and nickel were used to make contact with the fused salts.
A Study Of The Preparation And Properties Of Some Metallic Soaps, Charley George Hagan
A Study Of The Preparation And Properties Of Some Metallic Soaps, Charley George Hagan
Bachelors’ Theses
Soap may be defined as the sodium or potassium salt of the acids that are found in fats. The metallic soaps are those soaps or salts of the metallic bases other than sodium or potassium. The Study of the preparation, properties and uses of metallic soaps is rather an old one, most of the research along that line being done during the last quartile of the nineteenth century. Nothing of any importance has been done of late years in this field of research. Nearly all the work has been done by foreign investigators. The metallic soaps of oleic acid are …
The Evaporation Of Pyroxylin Solvents And Non-Solvents And The Effect Of Dissolved Pyroxylin On Various Types Of Evaporation Curves, Herbert Heinrich
The Evaporation Of Pyroxylin Solvents And Non-Solvents And The Effect Of Dissolved Pyroxylin On Various Types Of Evaporation Curves, Herbert Heinrich
Bachelors’ Theses
In 1833 Braconnot described a body which he called Xyloidine. This material was obtained by the action of nitric acid on starch. In 1838 Pelonze produced a similar body by treating paper with nitric acid. Although these experiments were conducted several years before those of Soh8nbein, yet we give Schonbein the honor of priority because of bis extensive studies on the new compound "explosive cotton wool". The material was produced by the combined action of nitric and sulphuric acids on cellulose. A patent was granted to him in the United States December 5, 1846, but little attention was paid to …
Studies Of Tungsten Hexachloride, Arthur Andrew Vernon
Studies Of Tungsten Hexachloride, Arthur Andrew Vernon
Honors Theses
The purpose of this thesis is to give a summary of the work done in studying the equilibrium conditions and rate of reaction of the compound tungsten hexachloride, together with some of its applications to the elimination of spots in coiled filaments. Tungsten hexachloride is a purple colored crystalline compound formed by passing chlorine over red hot tungsten in a tube from which all the air has been washed. It is rather unstable at room temperature in the presence of moist air, forming an oxychloride formula WoCl4 and then decomposing into tungsten oxide into the formula WO3 and the vapor …
A Study Of The Equilibrium Between Lead, Lead Iodide And Iodine, William Worden Day
A Study Of The Equilibrium Between Lead, Lead Iodide And Iodine, William Worden Day
Honors Theses
Although considerable work was done in 1924 by N. B. l Reynolds on the equilibrium between Lead, Lead Iodide and Iodine, there is, at the present time, no accurate data as to vapor pressure of Iodine over Lead Iodide at various temperatures. The same is likewise true of almost all metal halides and this work was undertaken to get such data as could be computed 1 by direct pressure measurements. The fact that these vapors are very corrosive makes it impossible to use a McLeod gauge or any other common form of manometer to measure the pressure directly.
A Study Of The Process Of Electrical Conduction In Films Of India Ink, Henry Adolph Letteron
A Study Of The Process Of Electrical Conduction In Films Of India Ink, Henry Adolph Letteron
Honors Theses
The grid leak used in radio engineering often is an ink film. Is it used as a path of escape of electrons from the grid. This path is necessary, for electrons collect on the grid and cause it to become negatively charged. Since a vacuum tube will not function unless the grid is charged positively with respect to the filiament, the necessity of the grid leak is obvious. The rate of absorption of electrons by the grid, and of their removal by the grid leak can be controlled to a certain extent by varying this grid leak resistance.
The Sugar Content Of Blood, Ben King Harned
The Sugar Content Of Blood, Ben King Harned
Masters Theses
Summary and Conclusions:
1 We have shown that the picric acid methods are not accurate.
2. We have shown that the titrimetric methods are not adapted to clinical use.
3. We have demonstrated that the Folin-Wu method, which gives the same results
as the titrimetric methods, and is the most accurate method used in clinics,
gives results approximately 15 per cent too high, because of interfering
substances.
4. We have developed a mercuric nitrate method, specific for blood sugar by
virtue of the fact that it precipitates interfering substances before making the
determination.
5. We have developed an acetone method, …
A Study Of The Reactions Of The Sulphies Of The Tin Group With Hydrochloric Acid And In Non-Aqueous Solutions, Charles Bernard Cannon
A Study Of The Reactions Of The Sulphies Of The Tin Group With Hydrochloric Acid And In Non-Aqueous Solutions, Charles Bernard Cannon
Bachelors’ Theses
Arsenic, antimony, and tin constitute the so-called tin group, a subdivision of the hydrogen sulphide, or second group, in qualitative analysis.
The Equilibrium Between Lead, Lead Iodide And Iodine, Neil Bailey Reynolds
The Equilibrium Between Lead, Lead Iodide And Iodine, Neil Bailey Reynolds
Honors Theses
The fact of the instability of lead iodide at moderately high temperatures is well known. This work was undertaken in order to discover, if possible, the degree of dissociation, its change with the temperature, and to collect any other important facts connected with the equilibrium.
Methods In Determinative Minerology, Ruth Hespenheide
Methods In Determinative Minerology, Ruth Hespenheide
Chemistry Honors Papers
This 11 page thesis examines various schemes for determining minerals.
The Disintegration Of Refractory Brick By Carbon Monoxide, Wilbur J. Darby
The Disintegration Of Refractory Brick By Carbon Monoxide, Wilbur J. Darby
Masters Theses
"In experimental work carried on at East St. Louis, Illinois in 1916 and 1917, with a furnace of commercial size for the electrothermic dry distillation of zinc ores, a difficulty that developed was the destruction of the firebrick lining in certain parts of the large condenser. The condenser was satisfactory in other ways, yielding a large proportion of the zinc as liquid metal, with no blue powder; but in order to obtain a proper length of service from the condenser it became necessary to find and overcome the cause of the disintegration of the lining ... it will be evident …
Glucose From Corn Cobs, Barney Nudelman
Glucose From Corn Cobs, Barney Nudelman
Masters Theses
"The efforts of American chemists in recent years have been devoted largely to the utilization of our waste products...Corn cobs offer a particularly inviting field for research along this line on account of the large supply of cobs available and the variety of substances obtainable from them. One of the leaders in this branch of investigation is Dr. F. B. LaForge of the Chemistry Division of the Bureau of Agriculture, who has contributed numerous papers on the subject. In one of these, in collaboration with C. S. Hudson, he describes, among other things, the preparation of glucose, but recognizes the …
Quantitative Analysis (Gravimetric), L. Arthur Walton
Quantitative Analysis (Gravimetric), L. Arthur Walton
Chemistry Honors Papers
This 24 page thesis examines the determination of various compounds using gravimetric analyses.
Volumetric Chemical Analysis, Beatrice Brooks
Volumetric Chemical Analysis, Beatrice Brooks
Chemistry Honors Papers
This 20 page thesis illustrates various methods of volumetric processes.
Methyl Amines From Carbinol And Ammonium Chloride, Arthur Mark Howald
Methyl Amines From Carbinol And Ammonium Chloride, Arthur Mark Howald
Masters Theses
"During the spring of 1919 we undertook to prepare tri-methyl-amine for the Research Department of the Eastman Kodak Company in the Industrial Chemistry Laboratory of the Missouri School of Minds. According to V. Merz and K. Gasiorowski the three methyl amines were qualitatively proven to be present in the reaction products obtained by heating methyl alcohol, ammonia and zinc chloride to 220°C. in a bomb for fourteen hours. As these raw materials are inexpensive we attempted to prepare the tri-methyl-amine by this reaction employing for the purpose a small industrial autoclave. Methyl amines were obtained by the yield especially of …
The Chemistry Of Nitrogenous Food Stuffs, Emma M. Schweigert
The Chemistry Of Nitrogenous Food Stuffs, Emma M. Schweigert
Chemistry Honors Papers
This 18 page thesis contains analyses of various nitrogenous foods.
Non-Nitrogenous Foods, Edna M. Boyd
Non-Nitrogenous Foods, Edna M. Boyd
Chemistry Honors Papers
This eight page thesis discusses the chemical compositions of various non-nitrogenous foods.
The Chemistry Of Selected Food Stuffs And Condiments, Leslie F. Rutledge
The Chemistry Of Selected Food Stuffs And Condiments, Leslie F. Rutledge
Chemistry Honors Papers
This 17 page thesis discusses the composition of various foods, including milk, butter, bread and wine.
A Chemical Study Of The Enrichment Of Copper Sulfide Ores., John Dustin Clark
A Chemical Study Of The Enrichment Of Copper Sulfide Ores., John Dustin Clark
UNM Bulletins
The author reports on the results of sixty experiments on processes related to the enrichment of the sulfide ores of copper. Also submitted to Leland Stanford Junior University toward the Degree of Doctor of Philosophy.
Some Phenomena Which Accompany The Electrolysis Of Certain Salt Solutions, When The Electrodes Are Physically Separated By Means Of A Diaphragm Of Solid Gelatine, Containing The Same Salt As Is Used For The Electrolyte: A Study Of The Automatic Termination Of The Electrolysis, When Conducted Under The Above Conditions, Ernest Carl Wagner
Chemistry Honors Papers
This 22 page thesis is a record of work done during the summer of 1910, by Dr. W. H. Stoner, and during the summer of 1912 and the spring of 1914, by the writer, in the Chemical Laboratory of the Medico-Chirurgical College of Philadelphia.
Portland Cement, Asphalts And Bitumens, George R. Ensminger
Portland Cement, Asphalts And Bitumens, George R. Ensminger
Chemistry Honors Papers
This 37 page thesis classifies and analyzes cements, rock asphalt and bitumen.
Estelle Angier Science Notebook, M. Estelle Angier
Estelle Angier Science Notebook, M. Estelle Angier
Scrapbooks
1914 science notebook of Estelle Angier (Class of 1914). Class notes, descriptions of experiments, and conclusions. Angier added an additional note at the end of the notebook in 1971.
The Detection Of Poisons, Lloyd S. Cassel
The Detection Of Poisons, Lloyd S. Cassel
Chemistry Honors Papers
This 29 page thesis examines methods to determine the presence of various classes of poisons.
Gravimetric Analysis, Walter M. Lauer
Gravimetric Analysis, Walter M. Lauer
Chemistry Honors Papers
This 16 page thesis examines gravimetric quantitative analyses of various metals.
The Chemical Analysis Of Potable Waters, Ellwood Paisley
The Chemical Analysis Of Potable Waters, Ellwood Paisley
Chemistry Honors Papers
This 24 page thesis examines samples of drinking water, analyzing turbidity, sediment, odor and other elements present.
Select Methods In Quantitative Chemical Analysis, Florence Ada Brooks
Select Methods In Quantitative Chemical Analysis, Florence Ada Brooks
Chemistry Honors Papers
This 18 page thesis examines various methods of quantitative chemical analysis.
Chemical Analysis Of Foods And Their Adulterants: Being An Investigation Into The Nature, Relative Value And More Common Forms Of Adulterations Of Certain Foods, William Samuel Long
Chemical Analysis Of Foods And Their Adulterants: Being An Investigation Into The Nature, Relative Value And More Common Forms Of Adulterations Of Certain Foods, William Samuel Long
Chemistry Honors Papers
This 26 page thesis examines the composition, natural variations, and artificial variations of various foods.
Design Of A Lead Blast Furnace, Walter Irving Phillips, Andrew Jackson Seltzer
Design Of A Lead Blast Furnace, Walter Irving Phillips, Andrew Jackson Seltzer
Bachelors Theses
"In order to get the approximate size of the Furnace we made the following assumptions, being guided as far as possible by the practice of the Globe Smelting Works at Denver, Colorado whenever that could be ascertained"--page 1.
Analyses Of Limestones And Shales, Byron John Snyder
Analyses Of Limestones And Shales, Byron John Snyder
Bachelors Theses
"The limestones were analyzed to determine their value for cement and lime manufacture, and were taken from several counties in the state of Missouri. Most of the limestones examined were very pure. A considerable quantity of well burned lime is added to other material in the manufacture of cement, a lime of very pure type being the most acceptable in this work"--page 1.