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Articles 89251 - 89280 of 91705
Full-Text Articles in Entire DC Network
Water Resources News, Volume 2, No. 8, September 1970
Water Resources News, Volume 2, No. 8, September 1970
Water Current Newsletter
Waste Water Reuse
Action on Mercury Pollution
Improving Waste Treatment
Westside Water Resources Study
Pollution Guide for Scout Leaders
Water Pollution Control Need $33-37 Billion
Cleaning Nation's Waterways
Under Water Power Plants
Wanted - Catalog of Products Which Are Potential Waters Polluters
FWQA Wastewater Technology Study
Proposal Deadlines
University of Illinois Annual Water Quality Conference
Research Review
New Publications Received by the Institute
The Ias Bulletin, V4n4, September 1970, Iowa Academy Of Science
The Ias Bulletin, V4n4, September 1970, Iowa Academy Of Science
IAS Bulletin
In this issue:
--- Officers, Directors, and Section Chairmen, 1970-71
--- Roster of Committees
--- New Blood in the Board
--- Board Meeting October 31
--- Publications Committee to Meet
--- annual Meeting Committee to Meet
--- Chemistry Teachers of Central Iowa May Organize
--- Cooperative Project for Two-Year Colleges Underway
--- Request for Information on Environmental Education Materials
--- Academy Sponsors Environmental Education Conference
--- Indiana Academy Sets up Agency to Work with State Government
--- Northern Regional NSTA Conference
--- Correction to the Annual Report and Membership List
--- Gleanings from the Michigan Academy Newsletter
--- UNI Conservationist …
De Haas-Van Alphen Effect In Dilute Beryllium-Copper Alloys , I.S. Goldstein, David J. Sellmyer, B.L. Averbach
De Haas-Van Alphen Effect In Dilute Beryllium-Copper Alloys , I.S. Goldstein, David J. Sellmyer, B.L. Averbach
David Sellmyer Publications
The de Haas-van Alphen effect was investigated in pure beryllium and in Be-Cu alloys containing up to 0.34 at.% Cu. The extremal cross-sectional areas of the cigar-shaped third-band electron pieces of Fermi surface decreased with alloying. The areas of the coronet-shaped second-band hole piece increased with alloying. The magnitude of the area changes were compared with rigid-band-theory predictions. Corrections for lattice-parameter changes were included when possible. In the low-concentration limit, the theory is able to account for the observed area changes. For the highest-concentration alloy, there are deviations, for all areas measured, to greater changes than are predicted by the …
Pesticide Residues In Channel Catfish From Nebraska, N. P. Stucky
Pesticide Residues In Channel Catfish From Nebraska, N. P. Stucky
Nebraska Game and Parks Commission: Staff Research Publications
Channel catfish (Ictalurus punctatus) were collected in all of the major watersheds in Nebraska during the summer of 1964. Individual fat samples and composite blood samples obtained from these fish were analyzed to determine the concentrations of residues of DDT and its metabolites (o,p'DDT, p,p'-DDT, p,p'-DDD, and DDE) and dieldrin. A total of 178 fish, collected from 18 sites, were analyzed. As expected, the fat samples contained higher concentrations of the pesticides than did the blood samples. DDT residues were found in all fat samples, and average levels from 10 fish sampled at each site ranged from a …
Transient Optical Absorption By Self-Trapped Excitons In Alkali Halide Crystals, Robert Fuller, R.T. Williams, M.N. Kabler
Transient Optical Absorption By Self-Trapped Excitons In Alkali Halide Crystals, Robert Fuller, R.T. Williams, M.N. Kabler
Robert G. Fuller Publications
Transient absorption spectra produced by pulsed electron excitation at low temperature have been identified as due to transitions originating in the lowest triplet states of the self-trapped exciton. The current model, comprising an electron plus a self-trapped hole, is shown to provide electronic configurations for the higher excited states which give a good account of the principal features of the spectra.
12th Annual Rocky Mountain Spectroscopy Conference
12th Annual Rocky Mountain Spectroscopy Conference
Rocky Mountain Conference on Magnetic Resonance
Program and abstracts from the 12th 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 3-4, 1970.
Water Resources News, Volume 2, No. 7, August 1970
Water Resources News, Volume 2, No. 7, August 1970
Water Current Newsletter
New Protection Agency Proposed
New Oceanic Group
Environmental Changes Beneficial
Myth Criticized
Dirty Rain Damages Building
Harvesting Algae
Mercury Pollution Spreading
Potomac River Sites for Desalting Tests
Water Pollution Control Rules
Price Increase to Improve Environment
Water Management Proposal
Research Review
New Publications Received by the Institute
The Synthesis And Photolysis Of Kreysiginone And The Syntheses And Antibacterial Activity Of 1-Vinyl-3,4-Dihydroisoquinoline Methiodides, Bruce L. Jensen
The Synthesis And Photolysis Of Kreysiginone And The Syntheses And Antibacterial Activity Of 1-Vinyl-3,4-Dihydroisoquinoline Methiodides, Bruce L. Jensen
Dissertations
No abstract provided.
The Effects Of Various Treatments On Thiamin Diphosphate And Total Thiamin Levels Of Rat Tissues, Dong Hwa Park
The Effects Of Various Treatments On Thiamin Diphosphate And Total Thiamin Levels Of Rat Tissues, Dong Hwa Park
Theses and Dissertations
Tissue thiamin diphosphate was assayed enzymatically utilizing purified brewer's yeast apotransketolase. With this assay ten uumoles of thiamin diphosphate could be detected. Total thiamin was fluorometrically measured. For one to three days rats were placed under conditions of stress, consisting of loud noise treatment, emotional stress, deprivation of paradoxical sleep, and swimming to exhaustion, respectively. The body weight was markedly decreased at the end of the respective experimental periods except with the loud noise treated group, compared with the corresponding controls. Following two to three such consecutive treatments, the adrenal weight also showed a significant increase. Thiamin diphosphate and total …
The Chemistry Of Dehydronaphthalene, Richard Harold Hales
The Chemistry Of Dehydronaphthalene, Richard Harold Hales
Theses and Dissertations
The reaction of monohalonaphthalenes with potassium t-butoxide in a t-butyl alcohol-dimethyl sulfoxide (DMSO) mixture has been studied. The 1-bromonaphthalene reaction was extensively studied. Fifteen identifiable products were observed and conditions were found where the desired products, 1- and 2-t-butyl naphthyl ethers (V and VI) were formed in maximum yield, and their decomposition products, 1- and 2-naphthol (XIV and XV), were formed in minimum yield. The mole percent ratio of 1-substituted products (V and XIV) to 2-substituted products (VI and XV) was found under standardized conditions to be 0.35 ± 0.03 in every case when the halogen was I, Br and …
Small Angle Elastic Scattering Of 1.33 Mev Photons From Lead, Chwan-Kang Chiang
Small Angle Elastic Scattering Of 1.33 Mev Photons From Lead, Chwan-Kang Chiang
Masters Theses
No abstract provided.
Erasure Of Sediment Surface Features By Mellita Quinquiesperforata (Leske), Walter Richard Boehmer
Erasure Of Sediment Surface Features By Mellita Quinquiesperforata (Leske), Walter Richard Boehmer
OES Theses and Dissertations
Erasure of sediment surface features by individuals of the species, Mellita guinguiesperforata, observed in this study suggests that all members of the sub-order, Scutellina, are able to erase sediment surface features. Sweep time, the time needed to erase the surface features of an area, depends on the population density, individual size, and speed of movement of the sand dollars. Assuming their pattern of movement as random, the following equation can be used to determine sand dollar sweep time,
T - 3.2 N-0.76 (W / S) (A/ W2 )1.21
where T is sweep time, N is the …
Limited Resurrection Of The Born Approximation, Paul Finkler
Limited Resurrection Of The Born Approximation, Paul Finkler
Paul Finkler Papers
It is shown that the ordinary Born approximation for pn and pp̅ charge-exchange scattering correctly accounts for (1) the shape of the forward peak for 0 ≤ (-t) ≤ µ2/2 at PL = 8 GeV/c, and (2) the energy dependence of the cross sections at t=0 in the energy range PL,=2—8 GeV/c. This result is analogous to the well-known success of the electric Born approximation in Π+ photoproduction. It is then shown that the simplest interpretation of this surprising result within the framework of Regge-pole theory is in terms …
High Pressure Spectral Chemistry Of Selected Organic Compounds, Frank William Linsley
High Pressure Spectral Chemistry Of Selected Organic Compounds, Frank William Linsley
Theses and Dissertations
The series of compounds indicated by the formular C_6H_5-(CH=CH)n-C_6H_5 change in color from white (colorless) to yellow to orange to red to deep red as n increases from 1 to 12. Stilbene is the first compound of this series (n=1). Under pressure, exerted by a diamond anvil press, stilbene can be seen to change color from white to yellow to red as increasing pressure is applied. Similar color changes are observed for the compounds where n=2,3, and 4 when subjected to similar pressure. This study records and reports the spectra versus pressure for these compounds.
Record In Rock: A Handbook Of The Invertebrate Fossils Of Nebraska, Roger K. Pabian
Record In Rock: A Handbook Of The Invertebrate Fossils Of Nebraska, Roger K. Pabian
Conservation and Survey Division: Faculty and Staff Publications
Table of Contents:
Introduction
What Are Fossils? How Do They Form?
Fossilization
How Are Fossiliferous Rocks Formed?
What is Paleontology?
What Can Fossils Tell Us?
Fossils and Geologic Time
Fossils as Environmental Indicators
Fossils and Conservation
How Are Fossils Named?
Where Are Fossils Found?
Collecting Courtesy
Tools for Collecting Fossils
Tips on Collecting Fossils
Safety Rules
Quarry Safety
Safety Don'ts to Remember
Preparation of Specimens
A Bit of Advice
General Characteristics of Nebraska's Important Fossils
Phylum Protozoa (Single-Celled Animals)
The Living Protozoan
Fossil Protozoans from Nebraska
Phylum Porifera (Pore Bearers or Sponges)
The Living Sponge
Fossil Sponges from Nebraska
Phylum …
Molecular Luminescence From Turhenium, Osmium, And Terbium Chelates: 2°K To 300°K, Raymond William Harrigan
Molecular Luminescence From Turhenium, Osmium, And Terbium Chelates: 2°K To 300°K, Raymond William Harrigan
Chemistry and Chemical Biology ETDs
Two experimental spectroscopic investigations spanning the temperature range 300°K to 2°K were carried out on molecular complexes. The nature of charge-transfer phenomena in transition-metal chelates was studied extensively, and the thermal quenching of the luminescence of terbium (III) chelates was briefly investigated. The experimental methods employed were absorption and luminescence spectroscopy including photoflash excitation for studying transient luminescence decays. Measurements were performed on three osmium and three ruthenium complexes, all containing bidentate or tridentate heterocyclic aromatics as ligands. The compounds were studied in rigid solvent glasses, in poly(methyl methacrylate) (PMM), in an isomorphic host of tris(2, 2'-bipyridine)zinc(II) sulfate, and in …
A Comparative Study Of Business Arithmetic Students: The Use Of Calculators Vs. Manual Computation, Marietta Crawford
A Comparative Study Of Business Arithmetic Students: The Use Of Calculators Vs. Manual Computation, Marietta Crawford
Morehead State Theses and Dissertations
A thesis presented to the Business Education Graduate Committee at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Business Education by Marietta Crawford on May 25, 1970.
Crystal Structures Of Potassium Ferric Sulfate Minerals., Edward J. Graeber
Crystal Structures Of Potassium Ferric Sulfate Minerals., Edward J. Graeber
Earth and Planetary Sciences ETDs
The potassium ferric sulfate minerals, yavapaiite [KFe(so ) J and goldichite [KFe(so4) •4H2oJ were studied 42 2 using x-ray diffraction methods, and the results correlated with the mineral krausite [KFe(so4)2 ·H20J .
Yavapaiite crystallizes in space group C2/m with two formula weights in a unit cell of dimensions a= 8 .152A, b = 5, 153A, c = 7,877A and S = 911.70°. Goldichite , in space group P2 /c, contains four formula weights in a unit cell with a= 10 . 387A, b = 10.486A, c = 9.086A and 6 = 101.67°.
The structures were solved by three-dimensional Patterson syntheses …
Planning Aspects Of Pollution Control, Donald T. Cannell
Planning Aspects Of Pollution Control, Donald T. Cannell
Marine Affairs Theses and Major Papers
Pollution control and abatement has become a national social goal but improvement impeded by lack of adequate resource allocation. The uncertainties of technology, financing, nature, politics, law and institutionalism must be evaluated by corporate and government planners to find long-run solutions. The evaluation of the sensitivity of planning recommendations to the uncertainty involved in this multi-variate problem, along with national economic shifts caused by alternative abatement funding programs is critical in formulating the “best” plan to ensure success of the national program.
Donor Properties Of Dimethylsulfoniumcyclopentadienylide And Tetramethylenesulfoniumcyclopentadienylide In Metal Complexes ; Part Ii. The Attempted Preparation Of Boron Tricyanide, Gary Scott Barney
Theses and Dissertations
Part I.--Complexes of dimethylsulfoniumcyclopentadientylide and tetramethylenesulfoniumcyclopentadienylide with metal ions were studied in order to determine the coordination site on the ylids. Infrared spectra indicate that the ylids are coordinated through the cyclopentadienyl ring in all complexes except for the Hg(CN)2 complexes. Coordination-of the HgI2, CdI2, ZnCl2, and AgNO3 complexes is through the number one position on the ring as suggested by NMR data. Infrared and NMR data strongly indicate that the ylids in the Hg(CN)2 complexes are coordinated through sulfur. Part II.--The only method given in the chemical literature for the preparation of boron tricyanide could not be duplicated in …
A Dialyzable Phospholipid Renin Inhibitor, Donna L. Webber
A Dialyzable Phospholipid Renin Inhibitor, Donna L. Webber
Senior Scholar Papers
Crude renin preparations from steer kidneys were incubated with Cd2+ and with Zn2+ elevation of renin activity resulted in both preparations. Analyses of each preparation against Tris-saline, and finally EDTA, removed the cations; however, renin activity remained elevated. An indirect activation of Renin by Cd2+ and, to a lesser extent, Zn2+, was thus demonstrated. Removal of the cations by Tris-saline and DTA-dialyses was suspected to involve the loss by dialysis of a renin inhibitor. An isolation technique for a proposed phospholipid renin inhibitor similar to bovine phosphatidylserine, reported by another laboratory, was thought to be unnecessarily arduous due to the …
The Photochemical Reduction Of Octacyanomolybdate(V) Ion In Aqueous Solutions, Gordon W. Gray
The Photochemical Reduction Of Octacyanomolybdate(V) Ion In Aqueous Solutions, Gordon W. Gray
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The photochemical reactions occurring in aqueous solutions of octacyanomolybdate(V) ion, Mo(CN)83-, during irradiation with light of 365 and 436 nm wavelengths were studied. The quantum yields and reaction products were determined for neutral, unbuffered solutions as well as solutions buffered at pH 4.0, 7.0, and 9.0.
The results of these studies showed that the Mo(CN)83- ion is rapidly reduced by light to a Mo(IV) complex. In neutral or acidic media, the initial photoreduction product was found to be the red heptacyanoaquomolybdate(IV) ion, Mo(CN)7(H2O)3-. Photolysis in basic solution gave the …
Cation Exchange And Transport In Soil Columns Undergoing Miscible Displacement, Sung-Ho Lai
Cation Exchange And Transport In Soil Columns Undergoing Miscible Displacement, Sung-Ho Lai
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A mathematical model was developed to predict the exchange of one cation by another in a soil column undergoing one dimensional cation solution displacement under steady state flow conditions. The model allowed prediction of both the solution and exchanger phase concentration of the cation in question.
The model consists of a material balance equation which is a parabolic type partial differential equation. The assumption was made that equilibrium was reached instantaneously between the cations in the solution phase and the exchanger phase. This assumption reduced the material balance equation to a form that allowed numerical solution providing the data concerning …
An Analysis Of Orthodontic Treatment Results Employing Class Ii Armstrong Adjustable Intermaxillary Springs, Michael E. Shumate
An Analysis Of Orthodontic Treatment Results Employing Class Ii Armstrong Adjustable Intermaxillary Springs, Michael E. Shumate
Loma Linda University Electronic Theses, Dissertations & Projects
A study of orthodontic treatment results employing Class II Armstrong Adjustable Intermaxillary Springs was made on twenty-eight randomly selected patients which were treated by Dr. Maclay Armstrong.
The skeletal and dental changes observed during treatment with the Class II springs was compared with those results observed when comparable type malocclusions were treated with Class II elastics. A list of changes which were observed during treatment with Class II elastics was compiled from the literature using individual studies published by Ricketts, Creekmore and Hanes.
The study was based on the findings observed in the initial and final cephalometric radiographs. A statistical …
Hot Electron Injection Into Liquid Argon From A Tunnel Cathode, Pavel Smejtek, David G. Onn, M. Silver, P. Kumbhare
Hot Electron Injection Into Liquid Argon From A Tunnel Cathode, Pavel Smejtek, David G. Onn, M. Silver, P. Kumbhare
Physics Faculty Publications and Presentations
Hot electrons from a tunnel cathode have been injected into liquid argon (99.998% pure) at 87°K. The current vs voltage characteristics indicate that the injected hot electrons thermalize very slowly, losing their energy only by elastic scattering processes and finally by capture by the dilute impurities. The deduced thermalization time and distance are very long compared with that in helium, where bubble formation is responsible for energy loss.
Water Resources News, Volume 2, No. 5, May 1970
Water Resources News, Volume 2, No. 5, May 1970
Water Current Newsletter
Proposal Deadlines for Research Projects
Mr. Eugene Eaton Visits Nebraska Institute
Eutrophication Publication Available
Symposium on Man-Made Lakes
National Science Foundation Provides Grant for Students
Department of the Interior to Sponsor Conference on Environmental Pollution
President Signs Water Quality Improvement Act of 1970
Possible Reclamation of Wastewater for Denver?
Water Quality Administration Seeks Studies on Cost of Preventing Pollution
New Pollution Control Proposed by Secretary Hickel
High-Priority Problem Areas
Research Review
New Publications Received by the Institute
A Comparative Roentgenographic Cephalometric Study Of The Facial Profile Of Orthodontic Patients Treated At Loma Linda University With Winners Of The "Smiles Of The Year" Contest, Romeo I. Stoll
Loma Linda University Electronic Theses, Dissertations & Projects
The "Smiles of the Year" winners and patients treated at Loma Linda University by the extraction or non-extraction approach were compared by linear and angular variables of skeletal, dental and soft tissue components. These findings were analyzed statistically to determine significant differences in the profile and detect the relationship between the integument and hard structures.
The following conclusions were drawn from this investigation to reflect the trend of treatment at Loma Linda University.
- After treatment the patients had less skeletal convexity, but were more convexity than established standards.
- The incisors of the patients treated by the extraction approach were less …
An Investigation Of A Gas Measurement Technique Employing Ultraviolet Excitation, Alphonso Vincent Diaz
An Investigation Of A Gas Measurement Technique Employing Ultraviolet Excitation, Alphonso Vincent Diaz
Physics Theses & Dissertations
A study was undertaken to determine the general applicability of a temperature measurement technique which uses the fluorescence stimulated by a vacuum ultraviolet continuum as the indicator. This study was directed toward determining the temperature of nonradiating carbon monoxide. A number of ultraviolet radiation sources which produced high intensity in the region of l,150 A were investigated. This study led to the conclusion that the technique was not applicable to measurements in carbon monoxide within the present limits of' detectability.
A Kinetic Approach To The Inactivation Of Zinc By Various Soil Constituents, Shingara S. Sandhu
A Kinetic Approach To The Inactivation Of Zinc By Various Soil Constituents, Shingara S. Sandhu
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The adsorption reaction of zinc onto prochlorite, pyroxene, and biotite minerals, from dilute solution (water) was studied under isothermal conditions by agitated nonflow experiment method. The equilibrium concentration of zinc in the solution was determined both by radioactive tracer technique and adsorption spectrophotometer methods. The data were collected at three temperatures.
The data were treated by the equation:
∂θ/∂t = k1(1-θ)C - k-1θ
where θ is the fraction of total surface coverage and C is the equilibrium concentration of zinc in solution, k1 and k-1 are the rate constants for the adsorption and reverse …
A Report On The Statistical Properties Of The Coefficient Of Variation And Some Applications, Howard P. Irvin
A Report On The Statistical Properties Of The Coefficient Of Variation And Some Applications, Howard P. Irvin
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Examples from four disciplines were used to introduce the coefficient of variation which was considered to have considerable usage and application in solving Quality Control and Reliability problems.
The statistical properties were found in the statistical literature and are presented, namely, the mean and the variance of the coefficient of variation. The cumulative probability function was determined by two approximate methods and by using the noncentral t distribution. A graphical method to determine approximate confidence intervals and a method to determine if the coefficients of variation from two samples were significantly different from each other are also provided (with examples). …