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Articles 68581 - 68610 of 69079
Full-Text Articles in Physical Sciences and Mathematics
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 …
An Attempt To Correlate Certain Physical And Chemical Properties Of Various Commercial Animal Glues, Robert C. Andersen
An Attempt To Correlate Certain Physical And Chemical Properties Of Various Commercial Animal Glues, Robert C. Andersen
Bachelors’ Theses
The manufacture and use of glue involves many important industries, and up to recent times we, in America, have lost much by our old "rule of thumb" and traditional methods for testing glues. In recent times much work has been done on a strictly scientific basis to explain the actions of glue from both a colloidal and a physicochemical aspect.
This thesis is concerned in particular with the possibility of coordinating the different properties exhibited by the accepted glue tests so that a definite criterion might be postulated for a high-grade animal glue. This task, however, proved extremely difficult, for …
A Comparative Study Of The Proteolytic Activity Of Trypsin On Various Gelatins, Louis Hinkle Coggs
A Comparative Study Of The Proteolytic Activity Of Trypsin On Various Gelatins, Louis Hinkle Coggs
Bachelors’ Theses
Since 1839, the viscosity of liquids has been measured by means of capillary tubes. However, it was not until the year 1846, that the results of Poiaeu1lle's research were :made known to the public. Because of the comprehensiveness of Poiseuille's work, the concept of the laws controlling viscometry flow is attributed to him. For one hundred rears the subject of viscometry has been studied by many. During these years the principle a propounded by Poiseuille have been verified in general, but various corrections and modifications of viscometers in regard to drainage, surface tension, liquid head, and kinetic energy have been …
A Remedial Program In The Four Fundamental Operations In Decimal Fractions, Hallie Ruth Weber
A Remedial Program In The Four Fundamental Operations In Decimal Fractions, Hallie Ruth Weber
Master's Theses
Can the results of the teaching of the four fundamental operations in arithmetic be improved? This is an important question that confronts most teachers of arithmetic. How can the teacher eliminate the difficulties which interfere with pupil progress, and reduce the number of failures in arithmetic? A group diagnostic test will show not only the level of ability of pupils in the various operations, but will point out weaknesses so that the teacher may organize her work in such a way as to give time to those who are below the standard and omit deadening drill for those who are …
A Study Of The Effect Of An Equal Energy Spectrum Upon Metallic Selenium In Vacuo, George Butler Scott
A Study Of The Effect Of An Equal Energy Spectrum Upon Metallic Selenium In Vacuo, George Butler Scott
Master's Theses
Since little has been found in the literature, on the effect of a actinic properties on the conductivity of metallic selenium and on its spectral response when possessing these properties, it was thought noteworthy to construct several selenium cells having low and medium dark resistances and to study them with a view of seeking some correlation between their conductivity characteristics and their prismatic response in vacuo.
The Propagation Of Ten Meter Radio Waves By Vertical And By Horizontal Dipole Antennas, James William Haddock
The Propagation Of Ten Meter Radio Waves By Vertical And By Horizontal Dipole Antennas, James William Haddock
Master's Theses
Radio communication is made possible by means of energy that travels through space from the transmitter to the receiver in the form of electromagnetic waves. These waves move with the velocity of light and differ from visible light only in wave length or frequency. This radiant energy consists of a magnetic field and of an electrostatic field, at right angles to each other and also at right angles to the direction of propagation. Questions explored in this thesis include: 1. Is there a relation between the amount of reflected radio energy and the angle of polarization. 2. If so, which …
Variation Of Moments With Distributions Of Masses And Areas, Mayo Glenwood Shults
Variation Of Moments With Distributions Of Masses And Areas, Mayo Glenwood Shults
Master's Theses
The purpose of this investigation has been to determine the variations of the first, second, third and fourth moments as functions of distributions of masses and areas. These moments were found about a line or plane perpendicular to the horizontal axes of the figures, and at various distances along the axes. For a complete understanding of the problem, an explanation of various terms will be made in relation to mechanics statistics.
Montana Oil Fields, Conrad F. Lundgren
Montana Oil Fields, Conrad F. Lundgren
Bachelors Theses and Reports, 1928 - 1970
Since the discovery of oil in Montana in1916, the petroleum industry has advanced to a point where over 5,000,000 barrels of oil worthover $6,500,000 has been produced in each of the three past years (1936, 1937, and 1938).
Gauss' Hypergeometric Equation, William R. Smith
Gauss' Hypergeometric Equation, William R. Smith
Master's Theses
As early as the seventeenth century the English mathematician, john Wallis (1616-1703), used the term "hypergeometric" to describe a series which he was studying. This series, ∑(a)(a+b)(a+2b)…(a+n-1b), is quite different from the usual geometric series, hence the term, "hyper" (=above) plus "geometric," was used to signify that the series was of greater complexity than the geometric series. Wallis did not consider his series a power series or a function of x.
In 1769 this series received a remarkable development at the hands of Loonhard Euler who, following the example of Wallis, applied the word "hypergeometric" to it. He observed that …
A Study Of The Temperature Of The Vapor Above A Boiling Salt Solution, John Andrew Palm
A Study Of The Temperature Of The Vapor Above A Boiling Salt Solution, John Andrew Palm
Honors Theses
The results obtained with the apparatus seemed to be quite conclusive that the temperature of the vapor above a boiling salt solution is the same as the temperature of the pure solvent.
Studies On Silicic Acid Gels: Measurements On Surface Tension During Setting, Louis Werthman
Studies On Silicic Acid Gels: Measurements On Surface Tension During Setting, Louis Werthman
Honors Theses
In this paper, results will be presented to show the change in surface tension during gelation of silicic acid solution. This research was undertaken with the belief that the change in surface tension during gelation might give further insight into the process of gel formation.
The Regulation Of Silicic Acid Gels, Louis W. Thompson Jr
The Regulation Of Silicic Acid Gels, Louis W. Thompson Jr
Honors Theses
The discovery of Hurd and Griffith, that a silicic acid gel will regel after breaking up and washing, is not true thixotropy, but it would be of interest to study this. This paper is concerned with just this matter, the regulation of silicic acid gels.
The Relation Between The Concentration Of Silica And Time Of Set At Constant Ph, Howard Sheffer
The Relation Between The Concentration Of Silica And Time Of Set At Constant Ph, Howard Sheffer
Honors Theses
Silicic acid gels result from practically any sol of hydrated silica, merely with the lapse of time. The gel must, however, contain a large enough concentration of silica to give sufficient strength or rigidity for the gel to set. A sol which contains less than .5 percent SiO2 will give a very weak gel, or no gel at all. Sols which are strongly alkaline will not set at all.
The Formation Of Silicic Acid Gels In Very Strongly Acid Solutions, Raymond William Barclay
The Formation Of Silicic Acid Gels In Very Strongly Acid Solutions, Raymond William Barclay
Honors Theses
In the past few years much work has been done at Union College in attempting to determine the mechanism of the setting of silicic acid gels. All of this work, however, had been done in alkaline, weakly acid, or moderately acid solutions, and practically no investigation of silicic acid gels in very strongly acid solutions has been made. The purpose of this research was to undertake such an investigation The effect of temperature and pH upon the time of set was studies. Three different temperatures were used, and the pH of all gels are studied was below 1. Concentrated hydrochloric …
Gels Of Hydrated Titanium Dioxide, David Wright Godfrey
Gels Of Hydrated Titanium Dioxide, David Wright Godfrey
Honors Theses
In 1823, Rose (1) reported the preparation of a week structured titania jelly by the treatment if fusion of sodium carbonate and titanium dioxide wit hydrochloric acid. In 1938, Jacober (3) prepared weak titania jellies by a method similar to that used by Klosky and Marzano. Furthering this previous research, Jacober went on to demonstrate that titanium, as might be expected from its close similarity to silicon and its position in the same periodic family, shows a linear relation between the reciprocal of absolute temperature and the logarithm of the time of set of its gels, as silicon does.
Heats Of Solution In Liquid Ammonia, Herbert F. Zuhr
Heats Of Solution In Liquid Ammonia, Herbert F. Zuhr
Honors Theses
This paper will present the heat of solution of methyl ammonium chloride as a function of the concentration at -33 degrees. The heats of other amine and imine hydrochlorides, organic salts will also be included, as will the preparation of certain organic salts and calibration data.
Upon The Asymptotic Representation Of Entire Functions Where The General Coefficient Is The Product Of Two Gamma Functions, James R. Ellis
Upon The Asymptotic Representation Of Entire Functions Where The General Coefficient Is The Product Of Two Gamma Functions, James R. Ellis
Mathematics & Statistics ETDs
The essential purpose of this paper is to obtain further information in regard to the asymptotic representation of a power series.
The Determination, Analysis, Or Assay Of Sodium Nitrite, William Ellenbogen
The Determination, Analysis, Or Assay Of Sodium Nitrite, William Ellenbogen
Chemistry Honors Papers
This five page thesis examines the determination of sodium nitrite through volumetric and gravimetric analyses.
The Segregation Of Real Roots Of Lower Orders, Ross W. Bland
The Segregation Of Real Roots Of Lower Orders, Ross W. Bland
Master's Theses
The purpose of this thesis is the presentation of the better algebraic methods of the segregation of real roots of equations of lower orders and a brief historical sketch of the advance made in the development of algebra. Mention is also made of a few of the men who have made notable contributions to this field of mathematics and the time, as nearly as it is possible to determine it, when new ideas were discovered.
Linearity In Factor Analysis, Opal Emmons
Linearity In Factor Analysis, Opal Emmons
Master's Theses
The uniqueness of mathematics in that it is a science complete in itself makes it possible to apply mathematical tools to sciences which, in themselves vary widely in content. There is, however, a particular difficulty which must be surmounted. A given mathematical procedure may be valid in the science of mathematics but invalid in another science, such as psychology. The reason for this is that sometimes there is a discrepancy between the implicit assumptions in the field of mathematics and those implicit in the field of application. The purpose of this investigation is twofold: (1) To point out that linearity …
The Age Hardening Of Silver With Copper-Silicide, Joseph Edward Shaw
The Age Hardening Of Silver With Copper-Silicide, Joseph Edward Shaw
Bachelors Theses and Reports, 1928 - 1970
The successful application of the phenomenon of precipitation hardening to aluminum and copper has indicated the possibility of hardening all metals in the same way. The phenomenon of age hardening was discoveredin 1911, and since that time much research has been carried on in all parts of the world on various alloy systems.
Structure Of Eutectics, Dilip K. Das
Structure Of Eutectics, Dilip K. Das
Bachelors Theses and Reports, 1928 - 1970
The present paper is a result of work done on the study of structures of eutectics of a certain eutectic-forming binary systems. In this research work no systems with intermetallic compounds have been studied.
Investigation Of A Method For Extraction Of Indium From Zinc Flue Dust., Harold L. Tanner
Investigation Of A Method For Extraction Of Indium From Zinc Flue Dust., Harold L. Tanner
Bachelors Theses and Reports, 1928 - 1970
In metallurgical practice today some of the relatively rare metal Indium is recovered as a by-product from the ores of other metals. Indium is a soft, silvery—white metal belonging to the third group of the periodic classification. It is situated just above tin in the electrochemical series.
The Age Hardening Of Copper With Manganese Silicide., Gordon A. Davis
The Age Hardening Of Copper With Manganese Silicide., Gordon A. Davis
Bachelors Theses and Reports, 1928 - 1970
The increase in hardness is attributed to the manganese silicide being precipitated from solid solution and deposited between crystal planes. The subsequent softening which occurs on prolonging the period of reheating is believed to be due to an agglomeration of the dispersed hardening agent.
Heats Of Solution In Liquid Ammonia, Joseph Sottysiak
Heats Of Solution In Liquid Ammonia, Joseph Sottysiak
Honors Theses
Water, chemically speaking, is the most important individual substance known. Water occupies an outstanding position among solvents. In its capacity as a solvent for salts and as an ionizing agent, it is in a class by itself. Of all known liquids, ammonia most closely resembles water in those properties which make water outstanding among solvents. As a solvent, ammonia is secondary to water, however; many salts insoluble in water dissolve readily in liquid ammonia. Solutions of salts in liquid ammonia are excellent conductors of electricity. Ammonia unites with salts to form ammonia of crystallization. It solvates ions. It is an …
Geology Of The Golden Sunlight Mine And Vicinity, Roy H. Earhart
Geology Of The Golden Sunlight Mine And Vicinity, Roy H. Earhart
Bachelors Theses and Reports, 1928 - 1970
The Golden Sunlight Mine is in the northern part of the Cardwell mining district on the eastern slope of a small range that rises by a series of benches to an elevation of 7,200 at a point five miles east of the town of Whitehall in Jefferson County.
A Study Of Solders, John D. Prater
A Study Of Solders, John D. Prater
Bachelors Theses and Reports, 1928 - 1970
The purpose of this paper is to furnish a qualitative method of comparing the degree of wetting of various solders upon different plate metals when several fluxes are used.
The Pre-Jurassic Surface Of Montana., G. Fay
The Pre-Jurassic Surface Of Montana., G. Fay
Bachelors Theses and Reports, 1928 - 1970
It has long been known that, prior to the deposition of Jurassic sediments, Montana was subjected to an intensive period of erosion. Mention of this may be found in numerous reports, especially those dealing with western Montana.
Electrolytic Manganese, George T. Derana
Electrolytic Manganese, George T. Derana
Bachelors Theses and Reports, 1928 - 1970
The production of metallic manganese by electrolysis is of potential value for the recovery of this strategic metal from domestic deposits. These deposits are largely unsuitable for the production of ferromanganese, but they are amenable to low-cost leaching processes.