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Articles 287761 - 287790 of 293045
Full-Text Articles in Entire DC Network
Sedimentary Petrography And Environments Of Deposition Of The Plattin Group, Cliffdale Hollow, Jefferson County, Missouri., Narendra M. Naiknimbalkar
Sedimentary Petrography And Environments Of Deposition Of The Plattin Group, Cliffdale Hollow, Jefferson County, Missouri., Narendra M. Naiknimbalkar
Masters Theses
"Petrographic and depositional environments studies were completed on selected Plattin Limestone rock-samples from the Drill-cores of Cliffdale Hollow area, Jefferson County, Missouri.
Petrographic analysis of forty-four thin sections and the detailed megascopic study of the samples revealed the different types of limestone rocks which were classified on the basis of Folk's (1959) Carbonate Classification. As to the environments of deposition of the Plattin Limestone determined by petrographic study, it has been concluded that this environment was one of low to medium agitation and low to medium organic activity.
Chemical analysis of the Plattin Limestone samples revealed the presence of the …
The Reaction Of Sodium Iodide In Acetone With Halogenated Epoxides -- A Mechanism Study, Thomas E. Breuer
The Reaction Of Sodium Iodide In Acetone With Halogenated Epoxides -- A Mechanism Study, Thomas E. Breuer
Masters Theses
"l-bromo-2,3-epoxybutane reacted with sodium iodide in acetone to give 3-iodo-l,2-epoxybutane in 70.1 per cent yield. 3-bromo-l,2-epoxybutane produced l-iodo-2,3-epoxybutane in 69.9 per cent yield when it was allowed to react with a solution of sodium iodide in acetone. No other product could be isolated after either reaction, although it is possible that another compound may have been produced in very small amounts. The iodoepoxides were oxidized to the corresponding α-iodoacid in approximately ninety per cent yield by silver oxide"--Summary, page 40.
The Anodic Dissolution Of Zinc In Aqueous Solutions, Glenn E. Stoner
The Anodic Dissolution Of Zinc In Aqueous Solutions, Glenn E. Stoner
Masters Theses
"The increasing demand for protective metals as coatings and non-corrosive alloys has stimulated extensive research on the fundamental behavior of metals in corrosive media.
One of the problems still unsolved is the nature of the mechanism of the anodic dissolution of metals like zinc, magnesium, beryllium, cadmium, and aluminum in aqueous salt solutions. Several schools of investigators have proposed different and opposing theories to explain the discrepancies which often arise between coulometric data and the weight loss of metal electrodes in certain salt solutions.
The purpose of this investigation was to obtain experimental data for the anodic dissolution of zinc …
Investigation Of Measures Of Ill-Conditioning, Thomas D. Calton
Investigation Of Measures Of Ill-Conditioning, Thomas D. Calton
Masters Theses
“The object of investigation in this study is that of ill-conditioning in the solution of a system of linear equations. Ill-conditioning arises when the solution is very sensitive to small changes in the coefficients of the unknowns.
A study is made in this paper of the various proposed measures of ill-conditioning for the purpose of finding the most practical method or measure for determining whether a system is ill-conditioned.
The problem of near-singular or ill-conditioned systems is of great importance in the solution of linear systems because of the extensive use made of them in practical situations. Solution of a …
Stereoradiography As Applied To Problems Of Petrology., Martin Goldstone
Stereoradiography As Applied To Problems Of Petrology., Martin Goldstone
Masters Theses
"Stereoscopic examination of radiographs of rock and ore samples allows a rapid, cursory determination of texture and structure without time consuming preparation and use of thin sections. In addition, volumetric estimates of known mineral components can be made providing they possess significantly different x-ray absorption characteristics.
Stereoscopic effect was most pronounced for specimens having well defined components of structure such as bedding, banding, lineation, inclusions, textural variations and moderate to large x-ray absorption differences. In general, these conditions were best met by ores or ore minerals with their related gangue minerals.
Stereoscopic examination was not successful in revealing twinning or …
Fossil And Recent Beryciform Otoliths: An Adjunct To Ichthyological Classification., C. Kurt. Lamber
Fossil And Recent Beryciform Otoliths: An Adjunct To Ichthyological Classification., C. Kurt. Lamber
Masters Theses
"Otoliths are calcareous bodies, of consistent form, secreted in the auditory labyrinths of some higher fishes. Of three pairs, only the taxonomically important earstones (sagittae) are considered here. Specifically, this study is restricted to the sagittae of beryciform fishes (Order Beryciformes). Removal of some taxa from the order, and the possible relating of others, is suggested.
The morphology of beryciform sagittae is described, and three basic supra-familial groups are recognized. Diagnostic characters for families are given, with diagnoses of genera added. Sagittae of characteristic species are illustrated.
Otoliths of fossil beryciform fishes, as known from specimens and published illustrations, are …
Geology Of The Northern Half Of The Ellington Quadrangle Missouri., Robert Charles. Thornton
Geology Of The Northern Half Of The Ellington Quadrangle Missouri., Robert Charles. Thornton
Masters Theses
"Geologic mapping has been completed for the northern half of the Ellington Quadrangle, Missouri. Rocks exposed in the thesis area are Precambrian and Paleozoic in age. The Precambrian rocks are granites and felsite. The Paleozoic rocks include the Potosi and Eminence Formations, of Upper Cambrian age, and the Gasconade Formation of Ordovician age. Distinction between the Potosi and Eminence Formations is difficult because of conformable and transitional relationships. In the thesis area sufficient evidence was available to separate the dolomites of the Potosi and Eminence as mappable units. This mapping should be useful as a basis for more detailed geologic …
Mathematical Techniques In The Solution Of Boundary Value Problems., Vincent Paul Pusateri
Mathematical Techniques In The Solution Of Boundary Value Problems., Vincent Paul Pusateri
Masters Theses
"This study was undertaken to present a summary of mathematical techniques as applied to the solution of boundary value problems in partial differential equations.
The techniques that were presented can be considered to be some of the most popular in applied science.
The salient features of the study are that different techniques can present different analytical expressions for a solution to the same boundary value problem, and from the viewpoint of computation and accuracy one solution may prove more desirable than the other.
The study also indicates that in boundary conditions where finite discontinuities exists, a slight perturbation to remove …
Permeation Of Water Vapor Through Linear Polymer Films, Mohammed S. Rifai
Permeation Of Water Vapor Through Linear Polymer Films, Mohammed S. Rifai
Masters Theses
"Film formation from thermoplastic resin solutions Is Influenced by secondary intermolecular forces. Consider what may happen when organic coatings change from a liquid to a solid state. In the liquid state it is logical to consider the linear polymer molecules as agglomerates being dispersed in the volatile component rather than being present In solution. These molecular agglomerates are referred to as micelles. They have various degrees of orientation depending on the extent and the location of dipole forces in both polymer and solvent molecules.
When a coating is applied the solvent starts to evaporate and the micelles are driven closer …
A Numerical Approach To A Sturm-Liouville Type Problem With Variable Coefficients And Its Application To Heat Transfer And Temperature Prediction In The Lower Atmosphere., Troyce Don Jones
Masters Theses
No abstract provided.
Atomism In Late Nineteenth-Century Physical Chemistry, George Fleck
Atomism In Late Nineteenth-Century Physical Chemistry, George Fleck
Chemistry: Faculty Publications
No abstract provided.
1,3,5,7-Sym-Hydrindacentetrone And Its Derivatives, Irven Davies
1,3,5,7-Sym-Hydrindacentetrone And Its Derivatives, Irven Davies
University of the Pacific Theses and Dissertations
Three chapters of this dissertation, therefore,are devoted to describing the synthesis of 1,3,5,7-s-hydrinda-centetrone using the three starting materials, pyromellitic dianhydride by means of the four above described reactions.
1,3,5,7-s-Hydrindacentetrone, itself, and its properties are described in Chapter three when first prepared.
An entire chapter is devoted to the preparation of the dinitroso and dinitro derivatives; both because of the complexity of their reactions and because of their relative importance.
An additional chapter is devoted to other miscellaneous derivatives.
Conclusions have been drawn as to the appropriateness of each method of synthesis and are presented at the end of their respective …
Determination Of Thallium(Iii) Using The Dead-Stop End Point, Richard Blount Williams
Determination Of Thallium(Iii) Using The Dead-Stop End Point, Richard Blount Williams
University of the Pacific Theses and Dissertations
An accurate and fairly rapid method of analysis of thallium solutions is desirable in order to facilitate further investigation of the chemistry of thallium. The dead-stop titration method which has been successfully applied to other metals of Group 3b, will not be applied to the quantitative determination of the thallium (III) ion in aqueous solution.
Pleistocene Formations In Indiana, William J. Wayne
Pleistocene Formations In Indiana, William J. Wayne
Department of Earth and Atmospheric Sciences: Faculty Publications
The system of stratigraphic classification used in North America for all sedimentary rock units except nonmarine deposits of the Pleistocene Series established groups, formations, and smaller units based on objectively determined characteristics of the rocks and not on geomorphology or subjective features, such as geologic time. Not all students of the nonmarine Pleistocene have kept these two kinds of units distinct from each other. The Pleistocene sediments of Indiana and the surrounding States are continental in origin rather than marine, and thus they show far less lithologic homogeneity than sediments and rocks of marine origin. Nevertheless, these Pleistocene sediments can …
Topographic Regions Maps, J. A. Elder, V. H. Dreeszen, E. C. Weakly
Topographic Regions Maps, J. A. Elder, V. H. Dreeszen, E. C. Weakly
Conservation and Survey Division: Faculty and Staff Publications
No abstract provided.
On Science And Social Science, Robert Katz
On Science And Social Science, Robert Katz
Robert Katz Publications
There are many definitions of science, and these are commonly based on literary and social usage rather than on the technical problem of distinguishing different areas of scholarship. To evolve an adequate definition we shall attempt to extract common elements from physics, biology, chemistry, geology, and astronomy, from those fields which are commonly called sciences. Any acceptable definition of science must be equally applicable to all of these, to all the natural sciences. To speak in the usual metaphor, we shall attempt a "scientific" definition of science.
The Structural And Stratigraphic Relationships In The Paleozoic Rocks Of Eastern North Dakota, Frederick V. Ballard
The Structural And Stratigraphic Relationships In The Paleozoic Rocks Of Eastern North Dakota, Frederick V. Ballard
Theses and Dissertations
The thickness and areal extent of the commonly defined Paleozoic rock units in eastern North Dakota has been determined by a study of mechanical well logs. Isopachous wops of these units reveal several positive areas which persisted and influenced sedimentation and unit thickness throughout most of the Paleozoic Era. Precambrian topographic highs of either erosional or structural origin produced those influences in early Paleozoic time, whereas later effects resulted from periodic structural rejuvenation of the original highs. The activity of those highs appears to be related to the location of the basin depocenter. The most prominent highs were in Cavalier, …
Pelecypoda From The Lower Fox Hills Formation (Upper Cretaceous) Of Emmons County, North Dakota, Rodney M. Feldmann
Pelecypoda From The Lower Fox Hills Formation (Upper Cretaceous) Of Emmons County, North Dakota, Rodney M. Feldmann
Theses and Dissertations
The Fox Hills Formation in Emmons County, North Dakota, consists of 250-350 feet of medium to fine grained sand and sandstone with some shale interbeds. In Emmons County, the four members, Trail City, Timer Lake, Bullhead, and Colgate are not as distinct lithologically as they are in the areas from which they were described; thus, the unit has been subdivided into a lower part consisting of crossbedded sand and sandstone with calcareous, fossiliferous concretions and an upper part consisting of interbeds of buff sand and chocolate shale.
The gradational change from Pierre Shale lithology to the sands of the overlying …
Growth Rates Of Yellow Perch, Perca Flavescens (Mitchell), In Two North Dakota Lakes After Population Reduction With Toxaphene, Donald C. Warnick
Growth Rates Of Yellow Perch, Perca Flavescens (Mitchell), In Two North Dakota Lakes After Population Reduction With Toxaphene, Donald C. Warnick
Electronic Theses and Dissertations
Fishery waters overpopulated with desirable species generally produce few harvestable fish because of slow growth rates. In 1962 Bennett stated that no fish of harvestable were found in some waters thus affected. Eschmeyer (1936) made a similar observation concerning overcrowded populations of yellow perch (Perca flavescens). For lack of more efficient remedial measures the use of piscicides has been recommended to reduce the numbers the numbers of the problem species. Relatively low toxaphene concentrations in two North Dakota lakes substantially reduced the density of the yellow perch population the effect on other fish species was less obvious. The results reported …
An Introduction To The Analytical Study Of Mercury (Ii) Ion - Thiazate Complex, Jess Horlanda Reyes
An Introduction To The Analytical Study Of Mercury (Ii) Ion - Thiazate Complex, Jess Horlanda Reyes
University of the Pacific Theses and Dissertations
The problem involved in this research was to characterize some of the chemical and physical properties of thiazate through analytical procedure. At most, this thesis is a report of the findings when this compound reacts with mercury (II) ions in basic solutions. The methods of investigation made use of the Beckman Model DS and DU spectrophotometers, and the Beckman pH meter.
High Frequency Titrations In Liquid Ammonia, Jack Charles Hileman
High Frequency Titrations In Liquid Ammonia, Jack Charles Hileman
University of the Pacific Theses and Dissertations
An extensive literature has been established on the use of high frequency conductometric methods in chemical analysis and research. The fact that the instruments respond to chemical changes without having electrodes immersed in the reacting solutions has attracted the attention of many investigators. Until the last few years, practically all of the investigations were concerned with aqueous solutions, with the exception of measurements of dielectric constants.
There seemed no logical reason for not extending the use of the high frequency instruments to the study of Bronsted acid-base reactions, organic syntheses, rates of reaction, and the other commonly studied aspects of …
Electronic Data Processing--Its Place In The Administrative And Academic Areas At Eastern Illinois University, John Walstrom
Electronic Data Processing--Its Place In The Administrative And Academic Areas At Eastern Illinois University, John Walstrom
Masters Theses
No abstract provided.
Hydrolysis Of Alpha-D-Glucosamine-L-Phosphate, Michael James Pizanis
Hydrolysis Of Alpha-D-Glucosamine-L-Phosphate, Michael James Pizanis
University of the Pacific Theses and Dissertations
Some information on the hydrolysis mechanism of phosphate esters was obtained by studying the kinetics of ∝-D-Glucosamine-1-phosphate.
∝-D-Glucosamine-1-phosphate was synthesized, an experimental pH-rate profile for the hydrolysis of this phosphate was determined at 100 C.
It was proposed that Species I (see page 7) had P-O cleavage with intramolecular proton transfer to ester oxygen. Species II is believed to have the same mechanism of hydrolysis as monoanion of methyl phosphate and monoanion of ∝-D-Glucosamine-1-phosphate. This study indicates that Species III s reactive, while the dianion of methyl phosphate and the dianion of ∝-D-Glucosamine-1-phosphate are inactive. The increased reactivity of Species …
Rates Of Acidic Hydrolysis Of Triptych Boroxazolidines, Ronald Keith Stump
Rates Of Acidic Hydrolysis Of Triptych Boroxazolidines, Ronald Keith Stump
University of the Pacific Theses and Dissertations
Upon looking at the results of calculation of the rate constants given in Table 2, there are revealed some general trends as to the influence of the substituent groups on the values of the rate constants. If the rate constants of the reaction are considered at a fixed temperature, the rates of reaction in Group I decrease as the substituent is gradually changed from methyl to isopropyl. As soon as the substituent is changed from alkyl to an ether type,the rate of cleavage increases nearer to that of the parent compound again. The rate of cleavage of the nitrogen-boron bond …
Hydroxy Derivatives Of Benzalthiophenone, John M. Newey
Hydroxy Derivatives Of Benzalthiophenone, John M. Newey
University of the Pacific Theses and Dissertations
It is the purpose of this work to prepare a series of these chalcones containing the thiophene ring.
The compounds were prepared by the condensation of a series of benzaldehydes with acetylthiophene dissolved in dry ethylacetate and saturated with dry HCl. The benzaldehyde compounds were benzaldehyde, m-hydroxybenzaldehyde, o-hydroxybenzaldehyde, O-p-dihydroxybenzaldehyde and vanillin. To prevent the oxidation of the hydroxy groups of the benzaldehydes, the compounds were benzolated with benzoylchloride. The condensed products were debenzoylated with NaOH solution in an atmosphere of nitrogen to prevent oxidation during the debenzoylation process.
High Temperature Adsorption Studies On Solid Adsorbents, Julian Joseph Hamerski
High Temperature Adsorption Studies On Solid Adsorbents, Julian Joseph Hamerski
University of the Pacific Theses and Dissertations
It has been found that there exist certain crystalline aluminosilicates which provide regular net-works of channels with diameters no bigger than those of molecules. Such crystals can act as sieves (thus the name "molecular sieves" now marketed by the Linde Air Products Company) and bring about a separation of molecular species by occluding small molecules while not adsorbing larger molecules or molecules with shapes that do not "fit."
The aluminosilicates were termed zeolites first by Baron Cronstedt (1) some 200 years ago. He observed that certain mineral crystals, when heated, appeared to melt and to boil at the same time. …
Estimation Of Periodate By Oxindolamine, Lester Dale Burgess
Estimation Of Periodate By Oxindolamine, Lester Dale Burgess
University of the Pacific Theses and Dissertations
The carbohydrates play a vital role in the chemistry of the life processes. As man’s study of these processes, both fundamentally and in applied areas such as medicine, becomes ever more intensive, the limitations of our analytical procedures become ever more serious. While there are innumerable quantitative analytic procedures for the monosaccharides, there is a severe dearth of good micro colorimetric procedures. A particularly useful and widely used micro and semimicro procedure, based upon periodic acid oxidation, was originally introduced by Malaprade in France in 1928. In general, the consumption of the periodic acid in estimated by a back titration …
An Experimental Investigation Of Coloring Matter In Flowers Of Vinca Major, Alin Haykohi Gulbenk
An Experimental Investigation Of Coloring Matter In Flowers Of Vinca Major, Alin Haykohi Gulbenk
University of the Pacific Theses and Dissertations
Even though early man did not know the nature of coloring matter in flowers, he used the coloring matter as dye for centuries. There are a variety of reasons for the interest of chemists in natural and artificial coloring matters. One of these is the color pleasure, anothe1· is the commercial importance. The visible color facilitates the experimental work in the search for methods if separation, purification and determination of organic structures.
Search for the knowledge of coloring matter goes far back in history. Man has dyed his textiles with the help of mordants from the most ancient times up …
A Comparison Of Modern And Traditional Approaches To Problem-Solving In Two Sections Of Ninth-Grade General Mathematics, Mary Edith Crist
A Comparison Of Modern And Traditional Approaches To Problem-Solving In Two Sections Of Ninth-Grade General Mathematics, Mary Edith Crist
Dissertations and Theses @ UNI
The purpose of this study was to contrast the traditional approach with the modern approach in the teaching of problem-solving in ninth-grade general mathematics.
Mineralogy, Petrography, And Ceramic Properties Of Lower Cabaniss Underclays In Western Missouri, Anthony C. Tennissen
Mineralogy, Petrography, And Ceramic Properties Of Lower Cabaniss Underclays In Western Missouri, Anthony C. Tennissen
Doctoral Dissertations
The mineral and chemical components, the petrography, and the ceramic properties of the Weir-Pittsburg, Tebo, and Mineral underclays In Barton, Vernon, St. Clair, sod Henry Counties of western Missouri have bean Investigated by x-ray diffraction, differential thermal, spectrographic, microscopic, and certain ceramic testing techniques. The underclays are composed principally of little, kaolinite, end mixed-layer illite-montmorillonite. Illite is the dominant mineral. The principal non-phyllosilicate minerals are quarts sad pyrite. The under clays are mineralogically similar to the underlying shales and contain clay pallets which also are mineralogically similar to the underclays and shales in which they are found. The clay appears …