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Articles 69421 - 69450 of 69928

Full-Text Articles in Physical Sciences and Mathematics

A Study Of Methods Available For The Measurement Of The Conductivity Of Electrolytes Including A New Procedure Involving Electrodeless Determinations, Clyde Aubrey Crowley Jan 1939

A Study Of Methods Available For The Measurement Of The Conductivity Of Electrolytes Including A New Procedure Involving Electrodeless Determinations, Clyde Aubrey Crowley

Dissertations

No abstract provided.


The Refractive Indices Of Ethyl Alcohol And Water Mixtures, Janina Nowakowska Jan 1939

The Refractive Indices Of Ethyl Alcohol And Water Mixtures, Janina Nowakowska

Master's Theses

No abstract provided.


The Reactions Of Acid Halides With Sodium, Magnesium, Zinc And Amalgams, William H. Webb Jan 1939

The Reactions Of Acid Halides With Sodium, Magnesium, Zinc And Amalgams, William H. Webb

Masters Theses

"The reactions of acid halides with metals are of interest because there seems to be a possibility of abstracting the halogens from two molecules of the halide, and thereby bringing about a coupling reaction; or the formation of an intermediate organo-metallic compound which would react with another molecule of the acid halide. The result of these reactions should be the formation of diacetyl and acetyl chloride and of dibenzoyl or benzil from benzoyl chloride. This procedure would be far better than the usual procedures for the preparation of these compounds...The results reported in the literature by different workers, on the …


The Geology Of Caldwell And Winn Parishes: Including Geologic Maps Of These Parishes., John Huner Jan 1939

The Geology Of Caldwell And Winn Parishes: Including Geologic Maps Of These Parishes., John Huner

LSU Historical Dissertations and Theses

No abstract provided.


Oxidation Potentials Of Ferric Ammonium Citrate., Daniel P. Knopf 1916-1991 Jan 1939

Oxidation Potentials Of Ferric Ammonium Citrate., Daniel P. Knopf 1916-1991

Electronic Theses and Dissertations

No abstract provided.


The Application Of A Photronic Nephelometer In The Determination Of Calcium, A.M. Gross Jan 1939

The Application Of A Photronic Nephelometer In The Determination Of Calcium, A.M. Gross

Master's Theses

No abstract provided.


The Fixation Of Active Nitrogen By Organic Compounds, F. Russell Koppa Jan 1939

The Fixation Of Active Nitrogen By Organic Compounds, F. Russell Koppa

Master's Theses

No abstract provided.


Chemical Substitutes., Clarence Elmore Parks 1909-1987 Jan 1939

Chemical Substitutes., Clarence Elmore Parks 1909-1987

Electronic Theses and Dissertations

No abstract provided.


Some Applications Of The Principles Of Isomorphism And Variation To The Teaching Of Geometry, Ralph Mock Nov 1938

Some Applications Of The Principles Of Isomorphism And Variation To The Teaching Of Geometry, Ralph Mock

Mathematics & Statistics ETDs

In summary, it should be stressed that the numerous examples of this paper are important only in so much as they illustrate the use of the devices and concepts emphasized in the study. It is our premise that plane geometry, as usually taught, does not possess the value which it might have. Certain changes in content as well as in presentation would materially improve the course. This study, then, presents suggestions for improving the ordinary course in two directions. First, by presenting logical propositions from the students' experiences which are partially isomorphic to the theorems of plane geometry, it is …


A Study Of The Viscosity Of Gelatines, Mary Anthony Keller Aug 1938

A Study Of The Viscosity Of Gelatines, Mary Anthony Keller

Bachelors’ Theses

Only a casual perusal of the literature treating of enzymes impresses one with the importance of the subject. How could the process of digestion be carried on without the action of enzymes? The tanning industry is primarily concerned with so-called bates, which are enzymes. Other industrial ope.rations, such as brewing, the manufacture of glue, petroleum refining, the production of rubber and starch, are likewise largely dependent on enzymatic action. Another phase of enzyme activity turns to the prevention of disease and medical diagnosis.

Substrates are of no less importance. The present work is not so much a study of -enzymatic …


Study And Correlation Of Belt And Cambrian Arkoses Near Limespur, Montana, Ryan C. Mcnamee Jun 1938

Study And Correlation Of Belt And Cambrian Arkoses Near Limespur, Montana, Ryan C. Mcnamee

Bachelors Theses and Reports, 1928 - 1970

In the vicinity of Limespur, Montana, a siding along the Northern Pacific Railroad near Whitehall, Montana, occurs a characteristic type of arkose where­ in many small red mineral grains are distributed throughout the rock mass. It is in this respect that this arkose differs from other arkoses in the surrounding region.


A Study On The Origin Of Banded Agate, James E. Driscoll Jun 1938

A Study On The Origin Of Banded Agate, James E. Driscoll

Bachelors Theses and Reports, 1928 - 1970

Agate in any of its varieties presents numerous problems in regard to its origin. Many types have been described and their beauty elaborated upon, but little has been written concerning their formation and the problems involved. The genesis of agate implicates an amazing complexity of physical and colloid­al chemistry, as well as, various principles of geology.


Underground Stratigraphy Of Montana, Virgil R. Chamberlain Jun 1938

Underground Stratigraphy Of Montana, Virgil R. Chamberlain

Bachelors Theses and Reports, 1928 - 1970

The purpose of this thesis is to study the subsurface stratigraphy of the state of Montana from information acquired from well logs, composite logs, and measured sections. Underground stratigraphy is important for the intelligent prospecting for oil, gas, or water. A knowledge of the strata beneath us can be gathered only by measurements of numerous outcrops or by deep drilling with careful sampling or logging of the formations passed through.


The Jefferson Canyon Gypsum Deposit., Arthur Talpt Jun 1938

The Jefferson Canyon Gypsum Deposit., Arthur Talpt

Bachelors Theses and Reports, 1928 - 1970

Gypsum deposits are widespread geographically and are in many geo­logic formations. Ordinarily their character and origin, for the most part sedimentary, are not difficult to ascertain. Near Lewis and Clark Caverns, east of Whitehall, Montana, occurs a deposit of gypsum unique in many re­spects.


The Iodine Value Of Tung Oil, M. Beto Reiss Jun 1938

The Iodine Value Of Tung Oil, M. Beto Reiss

Bachelors’ Theses

In the oil and fat industry the iodine value is one of the most important criteria in testing for the purity of the substance at hand. According to the amount of iodine absorbed fats are classified as drying, semi-drying, and non-drying oils. If the respective oil possesses and iodine value lying between 130 and 200, it is considered a drying oil; between 95 and 130, a semi-drying oil, and between 1 and 95, a non-drying oil.


Solution To Theory Of Equations For Teachers And Graduate Students, Arthur Lawrence Birkholz Jun 1938

Solution To Theory Of Equations For Teachers And Graduate Students, Arthur Lawrence Birkholz

Bachelors’ Theses

This thesis is intended primarily for teachers and graduate students who often find it necessary to review all or part of the basic theorems in the study of equations. Dickson's excellent book on the subject, "First Course in the Theory of Equations", is a recognized authority, so to facilitate a study of this book the writer has worked the problems suggested by Dickson, because these problems, more than any explanation could, illustrate and simplify the theorems on equations.

The user of this work-must bear in mind that there may be several ways of working many of the problems, and hence …


The Surface Tension Of Ethylene Glycol With Various Additions, Walter W. Eichenberger Jun 1938

The Surface Tension Of Ethylene Glycol With Various Additions, Walter W. Eichenberger

Bachelors’ Theses

Ethylene glycol is a compound of great interest both from a practical and theoretical viewpoint. In its properties it lies midway between ethyl alcohol and glycerol. Several years ago this substance was a scientific curiosity and was produced solely by laboratory methods. At that time it had little commercial value principally because of its scar• city. However, the demand for glycol steadily rose after its many useful properties had become known until today it is a very common chemical staple. Such uses as in a non-freezing dynamite, as an anti-freeze for automobile cooling systems, as a hygrosoopic agent, as a …


The Efficiency Of Approximation Formulae For Determining The Rate Of Interest In Amortization Schedules, Wade Ellis May 1938

The Efficiency Of Approximation Formulae For Determining The Rate Of Interest In Amortization Schedules, Wade Ellis

Mathematics & Statistics ETDs

The problem of this study is to determine the relative efficiency of the more important formulae for approximating the rate of interest involved in an amortization plan when the amount of the debt, the amount of the periodic payment, and the number of periods are known. By efficiency this meant the degree of accuracy obtainable, and the time required for solution.


Age Hardening Of Silver-Platinum Alloys, Robert A. Wilson May 1938

Age Hardening Of Silver-Platinum Alloys, Robert A. Wilson

Bachelors Theses and Reports, 1928 - 1970

The alloy system selected for study was the binary alloy of platinum and silver. An examination of the various silver alloy diagrams revealed that of several possible alloys, the silver platinum was the most suit­able with regard to solubility.


Alkali Leaching Of Antimony Sulphide And Electrolytic Recovery Of Antimony From The Resulting Leach Solution, Vincent J. Andrews May 1938

Alkali Leaching Of Antimony Sulphide And Electrolytic Recovery Of Antimony From The Resulting Leach Solution, Vincent J. Andrews

Bachelors Theses and Reports, 1928 - 1970

It is the purpose of this investigation to obtain some insight into optimum conditions for leaching Stib­nite with sodium hydroxide solution and also to steady the factors affecting the electrolysis of the resulting solution.


Electrolytic Recovery Of Copper And Zinc From Brass., V. Kent Loughran May 1938

Electrolytic Recovery Of Copper And Zinc From Brass., V. Kent Loughran

Bachelors Theses and Reports, 1928 - 1970

The reclamation of metals from scrap is becoming increasingly important in the metallurgical industry. Copper, because it does not corrode readily and is electronegative to most common metals, is peculiarly adapted to reclamation.


Magnesium - Tellurium By Powder Methods, George Gale May 1938

Magnesium - Tellurium By Powder Methods, George Gale

Bachelors Theses and Reports, 1928 - 1970

Today considerable work is being done in the compressed metal powder field which is gradually ob­taining prominence as a valuable branch of metallurgy. The mass of data, however, has led to many different ideas on the results of sintering.


Geology And Ore Deposits Of The Golden Messenger Mine, Lewis And Clark County, Helena, Montana., John C. Archibald Jr. May 1938

Geology And Ore Deposits Of The Golden Messenger Mine, Lewis And Clark County, Helena, Montana., John C. Archibald Jr.

Bachelors Theses and Reports, 1928 - 1970

The Golden Messenger Mine which is approximately twenty-three miles northeast of Helena, Montana, near York, on Trout Creek, has long presented several problems of both theoretical and practical interest.


The Geology And Ore Deposits Of Jardine, Montana, Wolter Duykers May 1938

The Geology And Ore Deposits Of Jardine, Montana, Wolter Duykers

Bachelors Theses and Reports, 1928 - 1970

The subject to be covered by this paper is based upon field study made during a six week stay at Jardine. The work began on June 19, 1937 and ended on July 31 of the same year.


A Rapid Determination Of Small Amounts Of Lead In Zinc, George T. Hanson May 1938

A Rapid Determination Of Small Amounts Of Lead In Zinc, George T. Hanson

Bachelors Theses and Reports, 1928 - 1970

This investigation, carried on in the metallur­gical laboratories at the Montana School of Mines, was undertaken with the desire to work out a rapid method for the estimation, or the determination, of the amount of lead in zinc.


The Electrodeposition Of Manganese From Certain Aqueous Solutions., William C. Wallace May 1938

The Electrodeposition Of Manganese From Certain Aqueous Solutions., William C. Wallace

Bachelors Theses and Reports, 1928 - 1970

Manganese has been successfully electrodeposited from aqueous solutions in past years by several work­ers in electrochemical and electrometallurgical fields.

The present work was concerned, primarily, with investigation of electrodeposition from solutions which are commercially obtainable from the hydrometallurgical or pyrometallurgical treatment of the low grade mangan­ese deposits of this country.


A Simultaneous Analysis Of Beer Foam And Rsidual Beer, Irwin Joseph Maruszewski May 1938

A Simultaneous Analysis Of Beer Foam And Rsidual Beer, Irwin Joseph Maruszewski

Bachelors’ Theses

In the past, the brewing industry was more an art than a science. Not much was known about the chemical nature of beer, or about the chemical processes and reactions that took place in its manufacture. Until recently, that is, in the last century, no interest was taken in this phase of the manufacture of beer. In the last forty or fifty years, the brewing manufacturers realized, that to have a good quality of beer, more must be known of its chemistry and therefore chemists set to work and began to specialize in this field. The thing that was most …


The Tesla Coil, Willard H. Schultz May 1938

The Tesla Coil, Willard H. Schultz

Bachelors’ Theses

The following paper is an attempt to gather together and present in some order a few of the facts concerning the design, theory, and operation of the Tesla Coil. The writer's interest was first directed to the production of high frequency, high potential current by an article appearing on page 594 of the October, 1933 issue of the Popular Mechanics Magazine. Here the construction of a small coil was described. The writer built such a coil and was greatly disappointed with the results obtained from it. As is so frequently the case, this failure only intensified the desire to construct …


The Photography And Identification Of The Secondary Spectrum Of Helium, Elizabeth Moy Toy May 1938

The Photography And Identification Of The Secondary Spectrum Of Helium, Elizabeth Moy Toy

Bachelors’ Theses

Spectra are generally classified as emission or absorption spectra. Whenever a source is radiating, it is producing an emission spectrum. If the source is solid, such as the filament of f lamp, the spectrum is generally continuous, that is there is no interruption on the contlnum of wavelengths. When the source of radiation is a gas at normal or low pressures, it consists of bright isolated lines on an otherwise dark background, that is, it is discontinuous. Such spectra may be observed in flames, when metallic salts are introduced; in spaces between the electrodes of electric arcs; in spark discharges; …


The Effect Of Time, Temperature, And Pressure On The Hydrogenation Of Castor Oil, Darwin F. Kaestner May 1938

The Effect Of Time, Temperature, And Pressure On The Hydrogenation Of Castor Oil, Darwin F. Kaestner

Bachelors’ Theses

Although much research and investigation has been carried out during the past twenty years on t he hydrogenation of oils; only a small ·amount of this research has been devoted to the study of the hydrogenation of castor oil. In recent years much time has been devoted to the hydrogenation of those oils which yield edible fats. Castor oil, on the other hand, does not result upon hydrogenation in the formation of an edible fat, and hence, its characteristics were not fully studied. The intention of the author in doing this thesis was to obtain some data as to the …