Digital Commons Network^™

Limnological Aspects Of Lake Mead, Nevada-Arizona, John R. Baker, James E. Deacon, Thomas A. Burke, Samuel S. Egdorf, Larry J. Paulson, Richard W. Tew, Bureau Of Reclamation

Publications (WR)

Lake Mead is a deep, subtropical, moderately productive, desert impoundment with a negative heterograde oxygen profile occurring during; the summer stratification. investigations of the Boulder Basin of Lake Mead by the University of Nevada were initiated in November 1971. The primary objective of the study was to determine what effects industrial and sewage effluent from the Las Vegas metropolitan area, discharged into Las Vegas Bay, have had on the water quality and limnological conditions of Boulder Basin. Data from the 1975-76 period are presented in detail, with earlier data included in the summaries and discussions. Measurements of water temperature, dissolved …

Xeroradiography & Conventional Radiography : Comparative Imaging Of The Temporomandibular Joint, Nelson R. Gatov

Loma Linda University Electronic Theses, Dissertations & Projects

An investigation was conducted to evaluate the application of Xeroradiography for imaging the Temporomandibular Joint using the Updegrave and Weinberg positioning boards and to compare these images to those obtained by conventional radiography using the same positioning boards.

A cadaver head in which three spherical radiopaque implants had been placed was used in this study. A General Electric Model 1000 (Dental Unit) was the source of radiation. The conventional radiographs were produced on Dupont Cronex 2DC film and processed by a Phillips 810 automatic processed by a Xerox "125 System".

MAGNIFICATION

A comparison of the implant sphere diameters and the …

Metal-Ion Oxidative Decarboxylations. 9. Reaction Of Benzilic Acid With Cerium(Iv) In Acidic Perchlorate And Sulfate Media, Samir B. Hanna, Sezai A. Sarac

Chemistry Faculty Research & Creative Works

The kinetics of oxidation of benzylic acid (HLH) to benzophenone by cerium (IV) has been studied in several media using the stopped-flow technique. In HClO₄-Na₂SO₄-NaClO₄ media, which allow for the variation and control of the concentrations of the various Ce(IV) species at constant [H⁺] and ionic strength, the rate data suggest CeSO₄²⁺ as the kinetically relevant species. In HClO₄ the observed first-order rate constants, tetrad, first increase with increasing HLH concentration, then decrease slightly at higher substrate concentrations suggesting the intermediacy of two complexes: a reactive [Ce(IV)HL] and …

Metal-Ion Oxidative Decarboxylations. 10. Substituent Effects In The Cerium(Iv)-Benzilic Acids Reaction, Samir B. Hanna, Sezai A. Sarac

Chemistry Faculty Research & Creative Works

The rates of oxidation by cerium (IV) of several substituted benzylic acids (unsubstituted, 2,2′-dichloro, 4,4′-dichloro, 4,4′-dimethyl, 4,4′-dimethoxy, and 4,4′-dinitro) to the corresponding benzophenones have been studied spectrophotometrically in aqueous H₂SO₄, aqueous HClO₄-HOAc, and acetonitrile. The rates are much slower in H₂SO₄ than in the other two media, probably because of heavy sulfato complexation of cerium(IV). The px as of the various acids were determined potentiometrically. The Hammett p values in acetonitrile and HClO₄-HOAc media, derived from correlations with several sets of σ constants and with the newly determined pK …

Effect Of Drilling Fluid Components And Mixtures On Plants And Soils, Parvin Pesaran (Djavan)

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The concern about the environment has required that the effects of drilling fluids (muds) on surrounding areas be known. This study was initiated to investigate the effects of various muds on plant growth and on soils.

In preliminary studies in Phase I (31 individual mud components), it was concluded that the obvious dominant effects on plant growth of detrimental drilling fluid components included excess soluble salts, excess exchangeable sodium percentage, possibly a high pH in some mixtures, and undesirable physical conditions. The latter resulted from the sodium and/or starch, gums, and bentonite.

Phase II, the second year's study of the …

Kinetics And Mechanism Of The Solvolysis Of The Cis- And Trans-5, 5-Dimethyl-1, 3-Cyclohexanediol Bis-P-Toluenesulfonate In Aqueous Pyridine, Louis Frederick Holzknecht

Morehead State Theses and Dissertations

A thesis presented to the faculty of the Sciences and Mathematics School at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Chemistry by Louis Frederick Holzknecht on April 5, 1977.

Ua77/1 Western Alumnus, Vol. 47, No. 4, Wku Alumni Relations

WKU Administration Documents

Quarterly magazine created for WKU alumni. Regular features are Hilltopics, Sports, Alumni Newsgrams and Notes and In Memoriam. This issue includes:

• Energy: Campus Conservation
• The Quilting Bee
• Old-Timers Take the Court
• Students and the Job Hunt
• Behind the Scenes
• Living and Learning Laboratories
• Rx for Ailing Indoor Plants
• Mardi Gras! ROTC on Parade
• Following the Yellow Brick Road
• Ford: Words of a President
• Photo Feature - President Downing
• Lights, Camera, Actioin!

Stochastic Analysis Of The Effect Of Random Permeability Distributions On Confine Seepage, B. Dendrou, Elias N. Houstis

Department of Computer Science Technical Reports

No abstract provided.

Isolation, Purification, Scanning Electron Microscopy And Bacterial Dna Uptake Of Plant Protoplasts, Bronwyn G. Hughes

Theses and Dissertations

Protoplasts were isolated from tobacco and barley leaves in sucrose or mannitol using commercially available cellulases and macerozymes. Barley growth and protoplast isolation and purification conditions were optimized so that protoplasts were obtained in high yields free of unwanted debris and organelles. A technique for processing barley and tobacco protoplasts for examination by scanning electron microscopy was developed in which protoplasts seem to have maintained their structural integrity. Barley and tobacco protoplasts took up 3H-B. subtilis DNA, 125I-B. subtilis DNA or 125I-M. luteus DNA as a linear function of time (0-6 hr) and DNA concentration (0-200 μg/ml). Up to 16 …

Apical Closure Induction Using Bone Growth Factors And Mineral Trioxide Aggregate, Kenneth W. Tittle

Loma Linda University Electronic Theses, Dissertations & Projects

This study compared the ability of three different bone growth factor combinations with that of Ca(OH)₂ to stimulate apical closure as well as the effectiveness of Mineral Trioxide Aggregate (MTA) as an apical barrier. Fifty-six roots of second and fourth mandibular premolars of seven six- month old beagle dogs were used. Periradicular lesions were created over a four week period. The canals were cleaned and shaped and filled with Ca(OH)₂ for one week. They were then irrigated and received one of seven different treatments in a balanced design. Growth factors were placed in a carboxymethylcellulose carrier and delivered …

An Improved Approach For "Optimization" Of Multiple Policy Objectives, Perihan Soliman Tawfik

Dissertations and Theses

This thesis involved three categories of activity; development and testing of an expanded version of ELECTRE II, also the development of a computer software program for ELECTRE II.

The expanded version of ELECTRE II took the form of an input aiding questionnaire along with a tailored structure to suit a particular problem. The contents of the questionnaire were based on geueral problem solving concepts (techniques, strategies) gleaned from the systems science literature. This questionnaire assumed a programmed instruction format in contrast to that of an interactive computer software package, so that it would not be prohibitive in terms of expenses …

Can Physics Develop Reasoning?, Robert Fuller, Robert Karplus, Anton E. Lawson

Robert G. Fuller Publications

The life of every physicist is punctuated by events that lead him to discover that the way physicists see natural phenomena is different from the way non-physicists see them. Certain patterns of reasoning appear to be more common among physicists than in other groups. These include:
• focusing on the important variables (such as the force that accelerates the apple, rather than the lump it makes on your head);
• propositional logic ("if heat were a liquid it would occupy space and a cannon barrel could only contain a limited amount of heat, but this is contrary to my observations, …

Teacher's Guide Planning A 6th Grade Outdoor Education Program For Your School, William Arnold Muench

Theses Digitization Project

No abstract provided.

Vertical Drainage In Field Cores, Larry G. Wells, R. W. Skaggs

Biosystems and Agricultural Engineering Faculty Publications

No abstract provided.

Population, Home Range, And Dispersal Of Red Foxes In East-Central South Dakota, James D. Sweeting

Electronic Theses and Dissertations

The population, dispersal movements and summer home range of red foxes (Vulpes vulpes) were studied in east-central South Dakota during 1974 and 1975. The spring population density of foxes on a 23,319 ha study area declined from 9.2 families/township in 1974 to 7.6 families/township in 1975. Fifty-four percent of 130 foxes tagged in spring, 1974 and 1975 were recovered during the first year following tagging. Hunting and trapping accounted for 18.0 and 77.8 percent, respectively. Recoveries revealed that dispersing juvenile male foxes were more mobile than juvenile females; juvenile foxes traveled a mean distance of 39 km for males and …

Texas Eastern University Catalog, 1977-1978, University Of Texas At Tyler

Catalogs

No abstract provided.

The Monadnock Volume 51, 1977, Clark University Geographical Society

The Monadnock (Clark Geographical Society)

Volume 51 of The Monadnock. The Monadnock was the alumni magazine of the Clark University Geographical Society (1927-1985) (2014-present).

Petrology Of The Alaskites Of The Boulder Batholith, Montana, Kenneth C. Malick

Theses and Dissertations

The Boulder batholith outcrops in the Northern Rookies of western Montana. It is exposed over an area of 5700 km^2 and extends about 112 km along the continental divide from Mullen Pass on the north to 32 km south of Butte. The Boulder batholith represents an invasion of the upper zones of the crust by a large volume of fluid granodioritic quartz monzonitic magma emplaced at the close of a main orogenic episode during late Cretaceous and Paleocene time.

Eight alaskite bodies were chosen for sampling from previous field experience and from geologic maps published by the U.S.O.S. Textural descriptions, …

Spectroscopic Studies Of Hydrophobic Association Of Merocyanine Dyes In Cationic And Anionic Micelles, Sayed Sadiq Shah

University of the Pacific Theses and Dissertations

Merocyanine dyes exhibit interesting changes in absorption spectra with changes in solvent polarity. For example solutions of 1-methyl-4- (oxocyclohexadienylidene) ethylidene -1,4-dihydropyridine (MOED) are yellow, red, violet, or blue, in water, ethanol, acetone or pyridine respectively.¹ More striking effects are observed when aqueous solutions are diluted with various proportions of the organic co-solvents such as pyridine. The color varies across the whole spectrum from golden yellow to blue.These characteristic properties of merocyanine dyes in various organic solvents have been extensively studied and correlations between [see PDF file for formula]_max and solvent polarity have been determined. In this work the …

Kinetics And Stoichiometry Of The Aquation Reaction Of Pentaaquodihalomethyl Chromium(Iii) Ions, Mohammad Javaid Akhtar

University of the Pacific Theses and Dissertations

This study was designed to provide information about the mechanisms of pentaaquodihalomethyl chromium(III) ions (halo chloro, bromo and iodo).

...

Mechanisms based on carbonium ion, carbeno and carbenoid type intermediates are proposed. A mechanism based on the nucleophillic attack (S_N2) of water on the carbon center leading to a metal-formyl type intermediate is suggested as best fitting all the criteria observed in these studies.

(see PDF file for additional Abstract as it includes formulas)

The Liquid Phase Oxidation Of 1,3-Pentadiene, Carl B. Reaves

Retrospective Theses and Dissertations

The liquid phase autoxidation of 1,3-pentadiene to 2,4-pentadienoic acid utilizing gaseous oxygen at atmospheric pressure was investigated as a possible route for direct utilization of piperylene obtained during the cracking of naptha to ethylene. Catalyst system consisting of cobalt, manganese, and iron salts promoted by sodium, potassium and hydrogen bromides, were used under a variety of condition of catalyst concentration, temperature, oxygen flow and piperylene purity. Under all conditions studied, a large number of oxidation products were formed. Maximum yields of 2,4-pentadienoic acid were obtained using a cobalt acetate bromide catalyst at 85°C.

The Prediction Of The Temperature Of Small Clear Streams, Robert Nelson Crittenden

University of the Pacific Theses and Dissertations

A theoretical energy balance model was used to predict water temperatures in small clear streams which have limited heat transfer due to ground water flow. The model was designed for application to coastal streams in central California to determine reservoir release policies that would improve downstream salmon habitat by altering stream temperatures. The results of the model are predicted to be applicable to small clear streams in moderately calm and humid areas throughout the temperate zone, where the winters are not prolonged, and where there is little ground Hater flow.. It predicts that all turbulently flowing wateracts ,. identically. It …

Synthesis And Characterization Of Pentaaquo-4-Pyridylchromium (Iii) Ion, Danny Alan Biggs

University of the Pacific Theses and Dissertations

4-bromopyridine hydrochloride is a compound which has a relatively high formal charge on the 4 carbon. Molecular orbital calculations on pyridine show a +0.18 charge on the 4 position, a +0.15 charge on the 2 position, and a +0.05 charge on the 3 position with the nitrogen holding a -0.59 charge.¹² And in aqueous acidic solutions, and added +1 charge would be distributed throughout the aromatic ring of the resulting pyridinium ion, thus increasing all charges. Benzene would show all carbons being identical having relative charges of zero each on the scale used for pyridine. As a result of …

Series Intermittent Sand Filtration Of Wastewater Lagoon Effluents, David W. Hill, J. H. Reynolds, D. S. Filip, E. J. Middlebrooks

Reports

Previous researches have found single stage intermittent sand filtration to be a feasible and economic means of upgrading wastewater lagoon effluent to meet future standards. However the major constraint on their use has been the length of the filter runs. Laboratory scale and pilot-scale series intermittent sand filtration of wastewater lagoon effluents has been found to substantially increase the length of filter runs as well as produce a high quality effluent able to meet future standards. Higher loading rates were round to be possible with series intermittent sand filtration. The operation consistently produced an effluent meeting present Utah “Class C” …

Performance Evaluation Of An Existing Seven Cell Lagoon System, James H. Reynolds, Ralph E. Swiss, Christine A. Macko, E. Joe Middlebrooks

Reports

No abstract provided.

Water Flow Patterns In Heterogeneous Soils Under Trickle Irrigation, Abdolhossien Nassehzadeh-Tabrizi, Roland W. Jeppson, Lyman S. Willardson

Reports

No abstract provided.

Growth And Uptake Dynamics Of Selenastrum Capricornutum Parameterized By Percent Nitrogen, Ronald F. Malone, Kenneth A. Voos, William J. Grenney

Reports

Batch cultures of

Effects Of Soil Heterogeneity On One-Dimensional Infiltration, Charles Courette, Roland W. Jeppson

Reports

A parameter study for heterogeneous infiltration was performed employing a one-dimensional computer program. Soil heterogeneity was defined by linear variations of soil parameters. From the solutions obtained, the instantaneous and accumulative infiltration rates were correlated versus the rate in which the parameters varied in the soil profile. The end result being coaxial graphs from which a relative infiltration rate may be obtained by inputting time and the rates of change of various soil parameters.

Upgrading Aerated Lagoon Effluent With Intermittent Sand Filtration, Richard P. Bishop, James H. Reynolds, Daniel S. Filip, E. Joe Middlebrooks

Reports

Intermittent sand filtration was evaluated as a means of upgrading the quality of aerated lagoon effluents to satisfy the requirements of PL 92-500. The aerated lagoon in question treats the wastes from a milk and cheese factory located in northern Utah. The treatment system consists of two diffused air aeration ponds followed by a facultative settling pond, were applied to pilot scale intermittent sand filters with 0.17 mm and 0.40 mm effective size sands. The filters were loaded hydraulically from 0.25 million gallons per acre per day to 1.0 million gallons per acre per day. It was found that sand …

Environmental Quality Management In A Region With External Development Pressures, A. Bruce Bishop, Rangesan Narayanan, Lloyd E. Peterson, Roger D. Hansen, Matthew B. Conover

Reports

The objective of this study was to examine the problems of managing residuals and environmental quality in a region facing potentially rapid growth as a consequence of externally made development decisions. The research adapted and applied the residuals environmental management concept which recognizes the need for an integration of physical methods, implementation incentives and institutional arrangements in controlling air, water and solid residuals. The area selected for study, the Uintah Basin in Southeastern utah, has the potential for extensive energy resource and mineral development and could experience a large population influx and accelerated economic growth as a result. in the …