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Articles 691231 - 691260 of 702463
Full-Text Articles in Entire DC Network
A Comparison Of Coaches With Other Teachers In Montgomery County With Regard To Salary, Training, Teaching Loads And Other Factors, Leland D. Melvin
A Comparison Of Coaches With Other Teachers In Montgomery County With Regard To Salary, Training, Teaching Loads And Other Factors, Leland D. Melvin
All-Inclusive List of Electronic Theses and Dissertations
No abstract provided.
The Status Of The Indiana Superintendency, Arthur Dale Meighen
The Status Of The Indiana Superintendency, Arthur Dale Meighen
All-Inclusive List of Electronic Theses and Dissertations
No abstract provided.
Teaching Assignments In Indiana Secondary School During The School Years Of 1941-42 And 1946-47, John Alden Wilcox
Teaching Assignments In Indiana Secondary School During The School Years Of 1941-42 And 1946-47, John Alden Wilcox
All-Inclusive List of Electronic Theses and Dissertations
No abstract provided.
A Manual Of Clinical Procedures, Forms And Tests, Special Education Clinic, Indiana State Teachers College, Terre Haute, Indiana, John Victor Whitaker
A Manual Of Clinical Procedures, Forms And Tests, Special Education Clinic, Indiana State Teachers College, Terre Haute, Indiana, John Victor Whitaker
All-Inclusive List of Electronic Theses and Dissertations
No abstract provided.
The Application Of The Relaxation Method To The Solution Of Problems Involving The Flow Of Fluids Through Porous Media, Alexander Antoine Zwierzchowski
The Application Of The Relaxation Method To The Solution Of Problems Involving The Flow Of Fluids Through Porous Media, Alexander Antoine Zwierzchowski
Masters Theses
"The purpose of this investigation is to determine the feasibility of applying the relaxation method of mathematical analysis to the solution of problems in rheology. The relaxation method was first introduced by R. V. Southwell who applied it to the problem of electrical conductivity. It was later used by M. W. Emmons to solve two-dimensional heat conduction problems. The steady-state flow of fluids through porous media can be difficult or impossible by the usual analytical methods even with rather simple boundary conditions. The relaxation method promises to provide an easier method of solution and to provide a means of solving …
An Investigation Of An Electronic Ignition System For Internal Combustion Engines, Richard David Wheat
An Investigation Of An Electronic Ignition System For Internal Combustion Engines, Richard David Wheat
Masters Theses
"Many types of electric ignition systems have been developed, used, and discarded in favor of systems less expensive and more adaptable to internal combustion engines, Two types which might be classified as high-tension, jump-spark systems are in common use today. These two systems are (1) Battery-coil ignition used mainly on automobiles, and (2) Magneto-ignition used extensively on aircraft engines. A considerable amount of work has been done to determine the extent to which the character and intensity of the electric spark affect the ignition process. This work has revealed that a certain minimum amount of energy is required from the …
Barium-Tin Alloys, James Richard Whanger
Barium-Tin Alloys, James Richard Whanger
Masters Theses
"The author attempted to produce alloys of barium and tin using metallic barium and barium hydride. Also, an attempt was made to study the phase diagram using thermal analysis and X-ray investigation"--Introduction, page 2
Application Of Electrical Prospecting Methods To Two Types Of Sulphide Ore Deposits, Robert Van Nostrand
Application Of Electrical Prospecting Methods To Two Types Of Sulphide Ore Deposits, Robert Van Nostrand
Masters Theses
"Although certain types of sulphide ores, especially those near the surface of the earth, lend themselves very well to electrical prospecting methods, quite the opposite is true of the extensive deposits of the type found in the Mississippi River Valley. The purpose of this investigation was to discover additional facts concerning two distinct types of sulphide ores, and therefrom to develop a new technique which would be applicable to prospecting for the lead and zinc deposits found in the Mississippi Valley"--Introduction, page 1.
The Effect Of Silicate Ion And Hydroxyl Ion On The Abstraction Of Potassium Ethyl Xanthate By Galena, Pao-Zung Wu
The Effect Of Silicate Ion And Hydroxyl Ion On The Abstraction Of Potassium Ethyl Xanthate By Galena, Pao-Zung Wu
Masters Theses
"The purpose of this research was to investigate the effect of the silicate ion and the hydroxyl ion on the removal of potassium ethyl xanthate by galena; since the former ion is encountered during flotation owing to dissolution of silicates, and also sodium silicate being often used to disperse gangue minerals, and the latter one is encountered during floating in an alkaline circuit"--Introduction, page 1.
Analysis Of The Transit Traverse Survey Method Of The United States Department Of Interior, Geological Survey, Edward John Kimmick
Analysis Of The Transit Traverse Survey Method Of The United States Department Of Interior, Geological Survey, Edward John Kimmick
Masters Theses
"This thesis was undertaken to ascertain the feasibility of incorporating the United States Geological Survey methods of surveying and computing into a course of study in the Civil Engineering curriculum. It has been the author's opinion that a course of study could be tendered, as a definite project, which incorporates fundamental surveying and advanced surveying. The author's planned course of study was a method of third order transit traverse survey streamlining the method used by the United States Geological Survey. The time element and weather were the essential factors in the planning. In the advanced surveying course there are eighteen …
The Electrolytic Recovery Of Silver From Waste Silver Residues, Bailey Warren Hagar
The Electrolytic Recovery Of Silver From Waste Silver Residues, Bailey Warren Hagar
Masters Theses
"A considerable amount of silver is contained in the silver chloride-silver thiocyanate residue resulting from the use of silver nitrate and potassium thiocyanate by students of quantitative analysis in the volumetric determination of chlorine. The main objective of work described in this paper, therefore, was to find a simple and efficient method for recovering the silver from this silver chloride-silver thiocyanate residue...it was hoped that the experimentation described in this paper might also result in the design of inexpensive equipment which might be used by the small photographic shop"--Introduction, page 1-2.
Torque Characteristics Of High Speed Steel Twist Drills, Tien Chi Lee
Torque Characteristics Of High Speed Steel Twist Drills, Tien Chi Lee
Masters Theses
"The drill is the most efficient tool used by machinists, for in no other tool is the cutting surface as large in proportion to the cross sectional area of the body or part that is its real support. Drills have shared evolutionary developments from carbon steels to high speed steels and from flat to twist drills. Many investigations have been made on the twist drills, but due to the majority of their work being based on the size of drills from 1/2 to 1-1/2 inches or larger, there is a dearth of published data on the general problem of drills …
A Preliminary Investigation Of The Titanium-Copper Equilibrium System, August Robert Savu
A Preliminary Investigation Of The Titanium-Copper Equilibrium System, August Robert Savu
Masters Theses
"The element titanium has a high degree of chemical activity at room temperature when in a finely divided condition. In the massive state this activity is only exhibited at high temperatures. The powdered metal is highly pyrophoric. Titanium forms quite stable sulphides and carbides, although these are subject to oxidation at high temperatures. It also form nitrides. Titanium being a transitional element forms hydrides with hydrogen which are stable at ordinary temperatures, but which dissociate at red heat liberating the hydrogen and leaving the metallic titanium in a very active state. Alloys are formed with such metals as aluminum, manganese, …
Efficiency Of Various Types Of Reinforcement In Controlling Opening Of Cracks In Concrete Pavements, Frederick Richard Heartz
Efficiency Of Various Types Of Reinforcement In Controlling Opening Of Cracks In Concrete Pavements, Frederick Richard Heartz
Masters Theses
"To date very little work has been done on the subject of the amount of crack opening for different loads on concrete pavement. It is a known fact that these cracks must be held together sufficiently to have aggregate interlocking action if the pavement is to transfer loads from one edge of a crack to the other. The maximum permissable [sic] opening has been set at .027 inches by the Highway Research Board. The author has attempted in this investigations (1) to determine the effect of different spacing and different sizes of longitudinal and transverse wires in controlling crack opening …
Treatment Of Zinc Crusts By Vacuum Distillation, Chang-Hsu Shih
Treatment Of Zinc Crusts By Vacuum Distillation, Chang-Hsu Shih
Masters Theses
"The purpose of this research is to investigate the possibility of obtaining reasonably pure silver from the zinc crusts by vacuum distillation in one step. The effect of temperature, pressure, particle size, and time of distillation will be determined. The behavior of other constituents in the crusts are also to be studied"--Introduction, page 5.
X-Ray Investigations Of The Metal Deposits Resulting From The Electrochemical Displacement Process, Cheng Chih Fang
X-Ray Investigations Of The Metal Deposits Resulting From The Electrochemical Displacement Process, Cheng Chih Fang
Masters Theses
"The principle of electrochemical displacement has been well established in the science of chemistry and applied as a commercial process in some metallurgical processes, such as the cementation process and the immersion method of metal coatings. According to the EMF series of the metals, the upper, the more electronegative metal,* (*Here the term of 'electronegative' means the metal possessing high electrolytic solution pressure and going into the solution with the formation of positive ions. Some authors preferred to use 'electropositive' instead of 'electronegative', referring to the ions which are electropositive during dissolution.) will displace the lower, the more electropositive one, …
A Study Of Cathode Drift Compensation In D-C Amplifiers, Joseph W. Rittenhouse
A Study Of Cathode Drift Compensation In D-C Amplifiers, Joseph W. Rittenhouse
Masters Theses
"The expression, cathode drift, has to do with the random variations in vacuum tube plate current which are attributable to similar variations in emission velocities of electrons leaving hot cathodes. The fact that these random current changes appear to result from spurious drifts in cathode potential, since all other electrode potentials are unrelated to them, give rise to the expression, cathode drift...The problem with which this paper is concerned is a study of some of the possibilities of compensating for cathode drift effects in a single amplifier stage. Specifically, this paper will: (A) present a detailed mathematical and graphical analysis …
Automatic Wheel Balancer For Automobile Wheel, Frederick Eugene Nevin
Automatic Wheel Balancer For Automobile Wheel, Frederick Eugene Nevin
Masters Theses
"Automobiles of today have been so constructed that greater speeds under safer conditions now exist. One of the improvements has been the low pressure tire. These tires carrying less pressure necessitates a casing of greater volume. This has created a tire of greater thickness in the axial direction but at the same time has decreased the diameter. Because of these innovations in present-day tires the author believes the wheel assembly (tire, tube, wheel, and brake drum) should be considered as a rotating cylinder not as a rotating disk. This being the case, the condition of dynamic unbalance is more critical. …
The Establishment And Analysis Of A Triangulation System For The Teaching Of Advanced Surveying, Philip Blaine Newlin
The Establishment And Analysis Of A Triangulation System For The Teaching Of Advanced Surveying, Philip Blaine Newlin
Masters Theses
"The first thought of establishing a triangulation system for the University of Arizona student work was conceived early in the fall of 1947, when the author first learned that he would be in charge of the advanced surveying field parties during the spring semester. These men were to be instructed in the accepted manner of conducting surveys of higher order. This would include the measuring of a base line of second or first order accuracy, the turning of horizontal angles with this same degree of accuracy, the determination of the azimuth of the lines by astronomical observations, the running of …
Geology And Mineralization Of The Minerva Mine No. 1, Hardin County, Illinois, Matthew Peter Nackowski
Geology And Mineralization Of The Minerva Mine No. 1, Hardin County, Illinois, Matthew Peter Nackowski
Masters Theses
"This study originally was undertaken to describe the witherite identified in specimens collected at the Minerva Oil Company Mine No. 1, Hardin County, Illinois. The original specimens of witherite were collected on October 25, 1948, by Charles E. Tothill, while on a senior trip through the fluorspar mine. The witherite was identified by Dr. O. R. Grawe, Chairman of the Geology Department, Missouri School of Mines, Rolla, Missouri, to whom the specimens were presented. Dr. Grawe suggested that the writer visit the southern Illinois fluorspar area to determine the occurrence and distribution of the witherite. This mineral had been described …
Comparative Study Of The Collecting Property Of Naphthenic Acids With Oleic Acid As Applied To Calcite, Hematite, Barite, And Fluorspar, Siddhi Nath Mukherji
Comparative Study Of The Collecting Property Of Naphthenic Acids With Oleic Acid As Applied To Calcite, Hematite, Barite, And Fluorspar, Siddhi Nath Mukherji
Masters Theses
"The present investigation was undertaken to find out any comparable collecting property of some of the industrial naphthenic acids available in the market with that of commercial grade of oleic acid so that some information may be available in selecting naphthenic acids as flotation collectors. In the flotation industry, usefulness of oleic acid as non-metallic minerals collector is well established. On the other hand, the use of naphthenic acids as flotation collector has been reported only in few cases. Even in those cases, no attempt has been made to correlate their collecting properties with that of their physical and chemical …
A Study Of The Power Consumption Of Mine Scrapers, Stanley Francis Johnsen
A Study Of The Power Consumption Of Mine Scrapers, Stanley Francis Johnsen
Masters Theses
"Since scrapers were first employed in underground mining work, numerous changes in scraper design have transpired until now there are several common types of scrapers in use in mines over the world. The proved models of scrapers have been developed over a period of more than fifty years. Although specific scrapers have been tested to determine the amount of power consumed, no literature could be found concerning the relative power consumption of the different types of scrapers when operated under identical conditions. Purpose of Problem - The purpose of this study is to determine the relative efficiency of different types …
A Graphic Method For Determining Pressure Losses Due To Air Friction In Mine Airways, Robert F. Bruzewski
A Graphic Method For Determining Pressure Losses Due To Air Friction In Mine Airways, Robert F. Bruzewski
Masters Theses
"One of the most important factors that influence the selection of a fan or blower for circulating a desired quantity of air through mine workings is the total pressure that is required to overcome the resistance of the airways. Ordinarily, the major portion of this resistance is that caused by friction of the moving air on the surface of the airways. The pressure that is required to overcome this frictional resistance is calculated by means of the friction formula"--Introduction, page 1.
An Investigation Of The Weavability Of Wire With Observations On The Defects Of Wire And Wire Cloth, Walston Chubb
An Investigation Of The Weavability Of Wire With Observations On The Defects Of Wire And Wire Cloth, Walston Chubb
Masters Theses
"In the course of this year's work under the auspices of the Ludlow-Saylor research fellowship many problems of interest to the wire weaving industry have been investigated. Some of these problems have no academic novelty; others were not completed and have been laid aside for future investigations. The major problem for investigation this year was to discover a method by which the weavability of wire might be evaluated. A second problem for investigation was to discover the causes of some of the defects of wire and wire cloth. In addition to presenting the results of these investigations, this thesis represents …
The Barite Industry In The United States, James Byron Chaney
The Barite Industry In The United States, James Byron Chaney
Masters Theses
"Within the past few years, barite has become one of the most important non-metallic substance mined in the United States, as expressed by the large increase in production since 1943. The purpose of this treatise is to combine in a single volume important information concerning the geographical distribution, geology, mining methods, milling or beneficiation methods, production and utilization of barite in the United States. A large number of references has been used in preparing this treatment. The information has, as far as possible, been brought up-to-date. It is thought by the writer that the paper will present to the reader …
Further Studies - Heat Transfer Coefficients For Liquids In Forced Convection Normal To Banks Of Staggered Tubes, Terrell C. Claunch
Further Studies - Heat Transfer Coefficients For Liquids In Forced Convection Normal To Banks Of Staggered Tubes, Terrell C. Claunch
Masters Theses
"The problem for these experiments may be divided into two sections. The first section of the problem consists of setting up procedure for duplicating data. The second section is that of studying and explaining characteristics of the resulting curves. Correlation of the data obtained will be necessary in order to obtain the curves. In order that the first section of the problem could be solved it was necessary to establish a standard of cleanliness for the apparatus used. Establishment of procedures for the operations and cleaning of the apparatus was necessary. Before Kenneth E. Rudert began his design and construction …
Effect Of Transition Elements On The Transmittance Of B₂O₃ Glasses, Chandubhai Gordhanbhai Amin
Effect Of Transition Elements On The Transmittance Of B₂O₃ Glasses, Chandubhai Gordhanbhai Amin
Masters Theses
"For many years, boric oxide has been used extensively as a minor constituents in silicate glasses, because of its beneficial influence on their physical properties as well as on glass melting processes; but when used without silica or in too large proportion, the resulting glasses lack chemical durability...Because of its detrimental effect as a major constituent in silicate glasses or in borate glasses, very little work has been done on borate glasses, especially on colored borate glasses...The purpose of this investigation is to find out the effect of the transition elements on the transmission curves of the colored borate glasses"--Introduction, …
Design Of A Wind Tunnel For The Missouri School Of Mines And Metallurgy, William E. Speece
Design Of A Wind Tunnel For The Missouri School Of Mines And Metallurgy, William E. Speece
Masters Theses
"For some time there has been a need for a wind tunnel at the School of Mines for experimental work in the Civil and Mechanical Engineering Departments. With the expanding program and the possibility of establishing an Aeronautical Engineering School here, the need will be even more pronounced. So the problem will be of definite practical value. It was the original idea to design a small tunnel, build the tunnel, and to run a series of smoke tests on various structural models. However, after discussing the possibility of such a problem with school authorities, it was decided that if a …
Preparation Of Copper Single Crystals By Means Of Powder Metallurgy Methods, Wei-Kung Chang
Preparation Of Copper Single Crystals By Means Of Powder Metallurgy Methods, Wei-Kung Chang
Masters Theses
"Since different mechanical properties of metals result from different grain size became known, the metallurgists have been interested in finding out the true nature of the grain boundaries. Consequently, several different theories concerning the mechanism of recrystallization, grain growth, and the structure of metals were advanced and studied. These threw much light on the difference of properties between polycrystalline metals and single crystals of the same metals. The single crystals of metals were studied because they enabled the investigator to determine the important points of metallic behavior. The first work on single crystals was rather obscure and limited to isolated, …
A Correlation Of Formulas For The Flow Of Fluids In Pipes, John Gorman Duba
A Correlation Of Formulas For The Flow Of Fluids In Pipes, John Gorman Duba
Masters Theses
"At present there exist two quite distinct fields in fluid flow in pipes, the one in water supply and the other in the petroleum industry. It is the purpose of this paper to discuss the various pipeline flow formulas as used in both fields and to correlate the exponential type formula which is much used in practice with the Nikuradse curves obtained in the laboratory"--A Brief Historical Review, page 5.