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Articles 33271 - 33300 of 34523
Full-Text Articles in Physical Sciences and Mathematics
Catalytic Decomposition Of Hydrogen Peroxide By Manganese-Doped Magnesium Hydroxide, Nabih Philobbos Kelada
Catalytic Decomposition Of Hydrogen Peroxide By Manganese-Doped Magnesium Hydroxide, Nabih Philobbos Kelada
Archived Theses and Dissertations
No abstract provided.
Active Magnesium Oxide Prepared From Magnesium Oxalate Dihydrate, Jehane Nour El Dine Ragai
Active Magnesium Oxide Prepared From Magnesium Oxalate Dihydrate, Jehane Nour El Dine Ragai
Archived Theses and Dissertations
No abstract provided.
A Short Route To Benzyl Beta-D-Glycosides Of 2-Amino-2-Deoxy-D-Glucose And -D-Allose And Elimination Of The 3-Sulfonate From Benzyl 4,6-O-Benzylidene-2-Benzyloxycarbonylamido-2-Deoxy-3-O-(Methylsulfonyl)- Beta-D-Glucopyranoside, William Denham Rhoads
University of the Pacific Theses and Dissertations
It is one purpose of this dissertation to introduce a facile method for the preparation of β glycosides of D-glucose and D-allose.
It is the second purpose of this dissertation to investigate the preparation of 2-oxazolidinones forming a bridge between C2 and C3 of allopyranose. This preparation, along with the facile preparation of β-benzyl glycosides of D-glucosamine and D-allosamine, should lead to compounds which, in a few steps, can conceivably be used for coupling at positions 1 and 4.
Determination Of Flow Curves From Capillary Rise Rate Measurements, Richard Lehr Kissling
Determination Of Flow Curves From Capillary Rise Rate Measurements, Richard Lehr Kissling
University of the Pacific Theses and Dissertations
The measurement of viscosity is a common and useful technique for investigating the mechanical behavior of many real fluids. Theoretical interpretations of viscosity measurements have been important in attempts to elucidate fundamental properties of the liquid state. Brush (6) and Bondi (3) give reviews of the current status of attempts to construct theories of liquid viscosity, and it is quite apparent from these reviews that the molecular theory of rheological phenomena is in its infancy.
In addition to the fundamental aspects of viscometry, there are many practical applications to which viscosity measurements are directed (25). One has only to scan …
Thin Layer Chromatography Of Platinum And Palladium-Ammine Complexes, Edgar Roberto Montezuma
Thin Layer Chromatography Of Platinum And Palladium-Ammine Complexes, Edgar Roberto Montezuma
University of the Pacific Theses and Dissertations
Recent work in this laboratory has centered around Platinum metals and their coordination compounds. Specifically, Thin-Layer Chromatography of Platinum metal ions has been reported in one of the recent dissertations (1). The purpose of the present work was to carry out a systematic study of Thin-Layer Chromatography on the following complexes: Tetrammine Platinum (II) Chloride [Pt (NH3)4]Cl2 Tetraammine Palladium (II) Chloride. [Pd (NH3)4]Cl2 Hexammine Platinum (IV) Chloride. [Pt (NH3)6]Cl4 Hexammine Palladium (IV) Chloride [Pd (NH3)6]Cl4
After the complexes had been …
Current Density-Anodic Potential Curves Of Single Crystal Gaas At Low Currents In Koh, Martin E. Straumanis, J. P. Krumme, William Joseph James
Current Density-Anodic Potential Curves Of Single Crystal Gaas At Low Currents In Koh, Martin E. Straumanis, J. P. Krumme, William Joseph James
Materials Science and Engineering Faculty Research & Creative Works
Single p-type, GaAs crystals of high purity, Zn doped, were used to determine whether or not the inverse octahedral {111} faces show potential differences and various rates of anodic dissolution. The Ga{111}, As{111}, {110}, and {100} faces, were polished, etched, and etch-polished with concentrated H2SO4 + H2O2, and immersed in IN KOH. The Ga{111} faces were found to be the most noble with respect to rest and anodic dissolution potentials. The potential difference between the inverse {111} faces was as large as 0.14v for the rest and 0.123v for the dissolution potentials. The …
Electrocapillary Studies Of Reversible Charge Transfer V(Iii)/V(Ii) Electrode, Mohammad Ali Akhtar
Electrocapillary Studies Of Reversible Charge Transfer V(Iii)/V(Ii) Electrode, Mohammad Ali Akhtar
University of the Pacific Theses and Dissertations
Electrocapillary equation for an ideal polarized electrode based on Gibb's adsorption equation is appropriately recast into experimentally measurable quantities in order to apply it to a reversible charge transfer electrode.
To calculate the various parameters of the equation developed, experimental details were worked out. For the measurement of Current-time relationship of a single drop, a fast response potentiostat was built by using transistorized chopped stabilized operational amplifiers and precision components in the circuitry with proper compensation for IR-drop in the cell and the electrical double layer capacity. The analysis of I-t curves was done by taking into account the composite …
An Investigation Of The Feasibility Of Making Radiometric Titrations Of Precipitation Reactions, Harold Elmore Hammerstrom
An Investigation Of The Feasibility Of Making Radiometric Titrations Of Precipitation Reactions, Harold Elmore Hammerstrom
University of the Pacific Theses and Dissertations
The purpose of the present work was to (1) determine the feasibility of performing radiometric titrations using low activity radioisotopes and inexpensive equipment; (2) develop a workable procedure for performing ·radiometric titrations in the classroom; and (3) assemble the basic radioactive concepts needed so the content could be used in a chemistry course of study.
The limited work done previously with radiometric titrations has used solutions of high specific activity and relatively large volumes of solution. The use of high activity radioisotopes creates problems of radioisotope procurement, shielding, handling and disposal. The use of high activity radioisotopes required special training …
A Polarographic Study Of Substituent Effects In Nickel(Ii)-Complex Ions Of Pyridine And Pyridine Derivatives, Keith Edward Fester
A Polarographic Study Of Substituent Effects In Nickel(Ii)-Complex Ions Of Pyridine And Pyridine Derivatives, Keith Edward Fester
University of the Pacific Theses and Dissertations
The electrochemical technique of polarography was used to study the complexions formed by Ni(II) ion and pyridine compounds. It was of interest to vary the substituent group on the pyridine ring in order to observe the effects on the nickel - nitrogen coordinate bonds.
Palladium And Platinum Complexes Of Substituted 4-Vinylcyclohexene, Donald Y. Chinn
Palladium And Platinum Complexes Of Substituted 4-Vinylcyclohexene, Donald Y. Chinn
University of the Pacific Theses and Dissertations
In recent years numerous complexes have been reported in which olefins were chelated to transition metals.Ever since the generally regarded first olefin complex, Zeise's salt (32) KPt(C2H43, the interest in this field of organometallic chemistry has expanded to several families of olefinic ligands and metals like palladium(II), platinum(II) copper(I), silver(I), and more recently vanadium and titanium
The nature of the bonding of olefins to metal atoms seemed to involved the interaction between pi electrons in the unsaturated molecule and the hybrid orbitals of the metal rather than a localized sigma bonds between the metal atom and …
A Study Of The Birch Reduction Of M-Methoxybenzamide, Luther Dickson
A Study Of The Birch Reduction Of M-Methoxybenzamide, Luther Dickson
University of the Pacific Theses and Dissertations
This thesis is (1) an investigation in the identity of the unknown material Qazi (20) obtained when benzamide was reduced at the boiling point of ammonia with 3.3 equivalents of sodium and ethanol, (2) characterization of the components of the brown liquid obtained when m-methoxybenzamide was reduced with a large excess of sodium (8 equivalents of more), and (3) characterization of the compound formed when the latter is subjected to sudden heat.
Endogenous Metabolism Of Polyporus Sulfureus. : Utilization Of Exogenous Carbohydrates And Fatty Acids, Shu-Mei Wang
Endogenous Metabolism Of Polyporus Sulfureus. : Utilization Of Exogenous Carbohydrates And Fatty Acids, Shu-Mei Wang
Masters Theses
"A strain of Polyporus sulfureus from the collection at the University of Missouri at Rolla was used in this investigation. Organisms of this genus have been reported to produce eburicoic acid in good yield and this was confirmed for the organism used in this study by the isolation and identification of eburicoic acid from the mycelium. Growth studies of this organism showed that 4% malt extract is a better medium than synthetic media containing asparagine, nitrate or nitrate plus 0.5% yeast extract as nitrogen sources. An examination of the pH of the culture medium led to the conclusion that regardless …
A Study Of Succinic Dehydrogenase, Indole Acetic Acid Oxidase, Nitrate Reductase And Cytochrome C Reductase In Hygrophorus Conicus, Jagdish M. Mehta
A Study Of Succinic Dehydrogenase, Indole Acetic Acid Oxidase, Nitrate Reductase And Cytochrome C Reductase In Hygrophorus Conicus, Jagdish M. Mehta
Doctoral Dissertations
"The activity of the enzyme succinic dehydrogenase (succinate : phenazine methosulfate oxidoreductase, EC 1.3.99.1) of Hygrophorus conicus, a member of a class of fungi known as basidiomycetes, was found to be stimulated by nitrate. Two substances were tested as electron acceptors in the measurement of succinic dehydrogenase activity. Of the two substances tried, phenazine methosulfate and brilliant cresyl blue, the former was found to be the best. Nicotinamide adenine dinucleotide (NAD⁺) was a necessary cofactor for the enzyme and could be readily dissociated from the enzyme. The enzyme has the properties of a high molecular weight nucleo- or lipoprotein.
The …
A Study Of The Precipitation Of Lead Bromide Fluoride At Low Ph Values In The Presence Of Boron, David W. Freund
A Study Of The Precipitation Of Lead Bromide Fluoride At Low Ph Values In The Presence Of Boron, David W. Freund
Bachelors’ Theses
The determination of fluorine has been an important analytical problem for some time. Volumetric, gravimetric and instrumental methods have been used with some degree of success. Each of these methods have been limited in some way and no completely satisfactory method for the determination of fluorine has been found. The most popular of these methods is the determination of fluorine as lead chloride fluoride. This method has the advantage of giving reasonably accurate results and the lead chloride fluoride precipitate gives an excellent conversion factor for fluorine due to its high molecular weight. The procedure requires no special or expensive …
Heats Of Combustion Of Some Tris (2,4-Pentanedionato) Metal (Iii) Complexes, Ronald Courtland Maynard
Heats Of Combustion Of Some Tris (2,4-Pentanedionato) Metal (Iii) Complexes, Ronald Courtland Maynard
Dissertations, Theses, and Masters Projects
No abstract provided.
Surface Interactions Between Nickel Ions And Sodium Dodecyl Sulfate, Ralph Edward Coleman
Surface Interactions Between Nickel Ions And Sodium Dodecyl Sulfate, Ralph Edward Coleman
Masters Theses
"In this research the interaction of nickel ions with the surfactant sodium dodecyl sulfate at the liquid-air interface was studied. Surface tension measurements were performed on pure sodium dodecyl sulfate solutions, with and without the addition of nickel ions. Results of these measurements showed that the addition of nickel ions lowered the equilibrium surface tension values of pure sodium dodecyl sulfate solutions and shifted the critical micelle concentration to lower concentrations. The foam fractionation technique was used to determine if the nickel ions could be removed from surfactant solutions. It was found that the removal of nickel ions was influenced …
The Effect Of Impurities On The Time Dependence Of The Surface Tension Of Aqueous Surfactant Systems, Elizabeth Ann Munson
The Effect Of Impurities On The Time Dependence Of The Surface Tension Of Aqueous Surfactant Systems, Elizabeth Ann Munson
Masters Theses
"In this study surface tension measurements were made on tetradecylpyridinium bromide (TPB) solutions both in water in solutions containing various concentrations of impurities. Three impurities were studied, dodecyl alcohol, decyl alcohol and dodecylpyridinium bromide. Surface tension vs. time plots were constructed and show a definite dependence on the concentration of the impurity added. As the concentration of the impurity increases the equilibrium surface tension decreases. The decrease in the equilibrium surface tension is also dependent upon the concentration of the tetradecylpyridinium bromide. As the concentration of the surfactant (TPB) increases the effect of the impurity is reduced"--Abstract, page i.
A Study Of Solvent Effects On The Reaction Between P-Nitrobenzyl Chloride And Hydroxide Ion In Aqueous Dioxane Homogeneous Media, Ken K. Ho
Masters Theses
"The kinetics and activation parameters of the reaction between p̲, p̲' - dinitrostilbene quantitatively, have been studied in five aqueous dioxane solvent systems at five different temperatures between 20⁰ and 40⁰C. At any one temperature the second-order rate constants are minimum in the 30% dioxane solvent mixture, reach a maximum in the 50% dioxane systems, and fall off slightly in the 60% and 70% dioxane systems. The Arrhenius activation energies are highest in the 30% dioxane and lowest in the 70% dioxane systems. The free energies of activation change in the same direction but the magnitude of change is much …
A Kinetic Investigation Of The Reaction Of Ethylenedinitrilotetraacetic Acid (Edta) And Cerium (Iv) In Acid Solution, Sahmia K. Al-Hashimi
A Kinetic Investigation Of The Reaction Of Ethylenedinitrilotetraacetic Acid (Edta) And Cerium (Iv) In Acid Solution, Sahmia K. Al-Hashimi
Masters Theses
"The reaction between Ce(IV) salt solutions and EDTA solution was followed titrimetrically and spectrophotometrically and found to occur in stages. Four equivalents of Ce(IV) are reduced per mole of EDTA almost instantaneously at room temperature or even lower. With increasing temperature and reaction time an ultimate of about 14 equivalents of Ce(IV) is consumer per mole of EDTA. Formaldehyde, carbon dioxide, and other unidentified compounds are the products of oxidation of EDTA with Ce(IV). The kinetics of the reaction in aqueous sulfuric acid (0.09 - 2.95 M̲) was studied over the temperature range 11.7-40⁰ by a spectrophotometric technique. In the …
Mathematics Of The Variation And Mole Ratio Methods Of Complex Determination, James O. Wear
Mathematics Of The Variation And Mole Ratio Methods Of Complex Determination, James O. Wear
Journal of the Arkansas Academy of Science
No abstract provided.
Heterocyclic Aromatic Fluorides By A Modified Schiemann Method (1), Frank L. Setliff
Heterocyclic Aromatic Fluorides By A Modified Schiemann Method (1), Frank L. Setliff
Journal of the Arkansas Academy of Science
No abstract provided.
Ground Water Flow Systems Of Central Nevada, G. William Fiero Jr
Ground Water Flow Systems Of Central Nevada, G. William Fiero Jr
UNLV Theses, Dissertations, Professional Papers, and Capstones
The U.S. Atomic Energy Commission has been evaluating a large area of central Nevada in order to define a supplemental test site for the underground testing of high-yield nuclear devices. Safety considerations involving the radiocontamination of the ground water in the vicinity of the test site necessitated that research be conducted to determine the direction and rate of flow of the ground water. This investigation defines the ground water flow systems in eighteen valleys comprising 12,000 square miles of central Nevada.
The definition of the systems was made following a compilation of existing hydrologic and geologic data for the area. …
Synthesis And Properties Of Diorganomagnesium Compounds, Conrad William Kamienski
Synthesis And Properties Of Diorganomagnesium Compounds, Conrad William Kamienski
Doctoral Dissertations
Introduction: Although dialkylmagnesium compounds have been known for over a hundred years, relatively little effort has been directly expended on these reagents per se; much of what we know about magnesium alkyls has been an outgrowth of previous studies concerned with the nature of the Grignard reagent. Only recently has any effort been made to elaborate on methods for preparing these reagents, to determine carefully their physical and chemical properties, and to develop practical uses for these reagents. It has been the purpose of the present study to review the presently known methods of preparation of dialkylmagnesium compounds, to …
The Evaluation Of Certain Serum Iron Analyses By Atomic Absorption Spectroscopy, James Allan Boersma
The Evaluation Of Certain Serum Iron Analyses By Atomic Absorption Spectroscopy, James Allan Boersma
Masters Theses
No abstract provided.
A Study Of The Removal Of Pesticides From Water, James David Whitehouse
A Study Of The Removal Of Pesticides From Water, James David Whitehouse
KWRRI Research Reports
The purpose of this study was to investigate some of the properties of pesticides as they exist in water, and to determine the effectiveness of several water treatment processes in the removal of pesticides from water. Among the pesticides investigated were malathion, DDT, aldrin, dieldrin, captan, benzene hexachloride (BHC), 2,4-D, and 2,4,5-T. The water treatment processes included aeration, chemical coagulation, adsorption on activated carbons and clays, and foam separation.
The removal of pesticides from water by aeration was found to be significant. Dieldrin was removed almost 100 percent, while aldrin, DDT, and BHC were removed to a lesser extent. 2, …
An Indirect Spectrophotometric Method For Expansion Of The Optimum Concentration Range, Henry David Mitchell
An Indirect Spectrophotometric Method For Expansion Of The Optimum Concentration Range, Henry David Mitchell
Masters Theses
No abstract provided.
Water Quality Study Of Lake Mead, Dale A. Hoffman, Paul R. Tramutt, Frank C. Heller, Bureau Of Reclamation
Water Quality Study Of Lake Mead, Dale A. Hoffman, Paul R. Tramutt, Frank C. Heller, Bureau Of Reclamation
Publications (WR)
This report presents Lake Mead Water quality data obtained from 1964 to 1966. The effect of filling Lake Powell on the water quality of Lake Mead is evaluated. General limnological principles and the present limnology of Lake Mead are discussed. Lake Mead has a warm monomictic annual temperature cycle characterized by summer stratification, fall overturn leading into a continuous circulation throughout the winter; temperatures never fall below 39 deg F (4 deg C). During stratification, lower dissolved oxygen values were recorded in the thermocline than in the epilimnion and hypolimnion. Mineral content increases from the upper to the lower end …
Pyrolysis Kinetics Of Ethyl Nitrate, Betty Meihorng Lee
Pyrolysis Kinetics Of Ethyl Nitrate, Betty Meihorng Lee
Masters Theses
No abstract provided.
A Study Of The Synthesis And Reactions Of Condensed Pyriadazines, Lorraine Marie Distefano
A Study Of The Synthesis And Reactions Of Condensed Pyriadazines, Lorraine Marie Distefano
Chemistry and Chemical Biology ETDs
A special interest in a nitramine rearrangement prompted the preparation of 1,4-diaminopyridazino [4,5-d] pyridazine and the nitration of this compound. Several reactions of the intermediates, which were synthesized en route to 1,4-diaminopyridazino [4,5-d] pyridazine, were studied. Strong evidence for the existence of keto-enol tautomerism was found in the case of 1,4-dihydroxypyridazino [4,5-d] pyridazine and its derivatives.
Some reactions of 5, 8-dichloropyrazino [2,3-d] pyridazine were studied with particular interest in the nucleophilic displacement of azides and in the nitration of 5,8-dianilinopyrazino [2,3-d] pyridazine.
The nitration of diaminophthalazine was also attempted in order to perform an acid catalyzed nitramine rearrangement from one …
9th Annual Meeting Rocky Mountain Spectroscopy Conference
9th Annual Meeting Rocky Mountain Spectroscopy Conference
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 9th annual meeting of the Rocky Mountain Spectroscopy Conference, sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy. Held in Denver, Colorado, August 7-8, 1967.