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Articles 285901 - 285930 of 293447
Full-Text Articles in Physical Sciences and Mathematics
Water Quality Telemetry First Annual Progress Report, Duard S. Woffinden, Allen D. Kartchner
Water Quality Telemetry First Annual Progress Report, Duard S. Woffinden, Allen D. Kartchner
Reports
No abstract provided.
Feasibility Of Rating Current Meters In A Velocity Field, Gaylord V. Skogerboe, Lloyd H. Austin, Roland W. Jeppson, Chi-Yuan Wei
Feasibility Of Rating Current Meters In A Velocity Field, Gaylord V. Skogerboe, Lloyd H. Austin, Roland W. Jeppson, Chi-Yuan Wei
Reports
Preliminary studies employed an 8-inch (outlet diameter) contracting cone and an 8-inch converging nozzle. The design of the cone is based on an electromagnetic analogy reported by Smith and Wang, while the nozzle was designed assuming potential flow and using numerical methods to obtain the solution. Both designs yielded fairly uniform velocity fields, any deviations being primarily due to either construction or measurement techniques. The towing tank rating for a Pygmy current meter was compared with the submerged jet rating, the difference being 1 or 2 percent. A Prototype system was constructed using a 16-inch contracting cone (d). Two Type …
Hydraulic Characteristics Of A Modified Venturi Section, Muhammad Aslam Rasheed
Hydraulic Characteristics Of A Modified Venturi Section, Muhammad Aslam Rasheed
Reports
The measurement of water in open channels on extremely flat grades is difficult because of the head loss that is necessary. A modified venture section, the contraction of which is provided by a top cover section mounted in a rectangular flume, is proposed to meet the requirements of a suitable measuring device for use in canals of flat gradients. The method of finite differences has been used for the mathematical solution to the idealized inviscid flow problem. This was followed by a laboratory investigation to ascertain the hydraulic characteristics of the proposed design. The experiments were conducted in a 3 …
Water Resources Research - A Challenge To The Social Scientists, Dean F. Peterson
Water Resources Research - A Challenge To The Social Scientists, Dean F. Peterson
Reports
No abstract provided.
Linear Programming With Random Requirements, Nak Je Kim
Linear Programming With Random Requirements, Nak Je Kim
Reports
Linear programming was first developed by George B. Dantzig, Marshall Wood, and associates of the U.S. Air Force, in 1947. At that time, the Air Force organized a research group under the title of project SCOOP (Scientific Computation of Optimum Programs). This project contributed to the developing of a general interindustry model based on the Leontief input-output model, the Air Force programming and budgeting problem, and the problems which involved the relationship between two-person zero sum games and linear programming. The result was the formal development and application of the linear programming model. This project also developed the simplex computational …
Air Pollution Control And Abatement Proceedings Of A Symposium, Allen D. Kartchner
Air Pollution Control And Abatement Proceedings Of A Symposium, Allen D. Kartchner
Reports
No abstract provided.
Atomic Absorption As An Index Of The Silver Concentration In Precipitation, Silver Iodide Plume Studies, Part 1, Joel E. Fletcher, H C. Millar
Atomic Absorption As An Index Of The Silver Concentration In Precipitation, Silver Iodide Plume Studies, Part 1, Joel E. Fletcher, H C. Millar
Reports
The Perkin Elmbver Model 303, equipped with the DCR-1, digital concentration readout, was evaluated as to its ability to provide an index of silver concentration in water solutions, without concentrating in any manner. The procedures, principal settings, and adjustments which must be observed are described.
This instrument can detect the difference between concentrations of 10-15 and 10-12 gm/ml. However, as the concentration of silver decreases the experimental error increases to a point at which the error becomes greater than the differences in readout due to differences in silver concentration.
Geologic And Limnologic History Of Glovers Pond, Northwestern New Jersey, J. Mark Erickson
Geologic And Limnologic History Of Glovers Pond, Northwestern New Jersey, J. Mark Erickson
Theses and Dissertations
Glovers Pond is a temperate, dimictic lake, 1.25 miles southwest of the town of Johnsonburg, Blairstown 7.5' Quadrangle, northwestern New Jersey. The Paleozoic Kittatinny, Jacksonburg, and Martinsburg Formations, in fault contact with each other, crop out in the vicinity of the lake. The lake has a maximum depth of 9.5 meters and occupies a glacially modified and dammed fault valley currently being infilled concentrically by .four types of sediment. Basim1ard these are: (1) peat, (2) marl, (3) "transitional", calcareous, organic-rich silt, and (4) gyttja. Glovers Pond is thermally and chemically stratified. The hypolimnion is undersaturated with CaCO3; tl1is prohibits deposition …
Lateral Variations Of Carbonate Rock Adjacent To Ore Deposits In The Upper Mississippi Valley Zinc-Lead District, Wisconsin, Illinois, Iowa, Mehdi H. Mirbaba
Lateral Variations Of Carbonate Rock Adjacent To Ore Deposits In The Upper Mississippi Valley Zinc-Lead District, Wisconsin, Illinois, Iowa, Mehdi H. Mirbaba
Masters Theses
"The lateral variation and nature of carbonate host rock in the Upper Mississippi Valley zinc-lead district were petrographically studied within the McGregor and Quimbys Mill Members of the Platteville Formation of the Middle Ordovician System. These members are dolomitic limestone in the Upper Mississippi Valley district of southwestern Wisconsin, northwestern Illinois and northeastern Iowa. One hundred and twenty-seven specimens were collected or were available from pull drifts in the Shullsburg mine. The specimens were collected at regular intervals of 50 or lOO feet in seven pull drifts between eight ore bodies. Thin sections prepared from the carbonate specimens were studied, …
The Geology Of The Thayer Area Emphasizing The Stratigraphy Of The Cotter And The Jefferson City Formations, William Jesse Hedden
The Geology Of The Thayer Area Emphasizing The Stratigraphy Of The Cotter And The Jefferson City Formations, William Jesse Hedden
Masters Theses
"Detailed geologic mapping of the Cotter-Jefferson City formational contact in the Thayer, Missouri area demonstrates the feasibility of using this contact. This mapping also delineates significant faulting in the area.
The stratigraphy of the Cotter and Jefferson City formations in the Thayer area has been studied to find a mappable contact between the two formations. The contact was mapped in this area by using marker beds, the stratigraphic positions of which were determined by applying insoluble residue techniques to outcrop sections. Because the insoluble residue zones of the Cotter and Jefferson City formations are recognizable throughout the state of Missouri …
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.
Quantitative Analysis Of Beach Sand Movement, Virginia Beach, Virginia, John D. Boon
Quantitative Analysis Of Beach Sand Movement, Virginia Beach, Virginia, John D. Boon
Dissertations, Theses, and Masters Projects
The present study describes a new approach to quantitative sediment tracing with dyed (fluorescent) particles, which can be used to obtain estimates of grain velocity, estimates of mobile layer thickness, and estimates of the rate of longshore sand transport.A simplified stochastic-process model was employed Involving the use of statistical procedures to analyze tracer displacement data on a time-stratified basis. The procedures provide meaningful estimates of the direction and magnitude of the movement of beach sand through set Intervals of time.
Results of a single tracer experiment are reported from a beach located near Virginia Beach, Virginia. The tracer particle-displacement data …
Guide To Estuarine And Inshore Bivalves Of Virginia, Donna Demoranville Turgeon
Guide To Estuarine And Inshore Bivalves Of Virginia, Donna Demoranville Turgeon
Dissertations, Theses, and Masters Projects
No abstract provided.
Age And Growth Of The Blueback Herring Alosa Aestivalis (Mitchill), Kenneth Lee Beal
Age And Growth Of The Blueback Herring Alosa Aestivalis (Mitchill), Kenneth Lee Beal
Dissertations, Theses, and Masters Projects
No abstract provided.
A Description And An Analysis Of The Results Of Using Cadet Teaching As A Method Of Improving The Multiplication Proficiency Of A Selected Sample Of Fourth And Seventh Grade Students, Richard Mark Anderson
A Description And An Analysis Of The Results Of Using Cadet Teaching As A Method Of Improving The Multiplication Proficiency Of A Selected Sample Of Fourth And Seventh Grade Students, Richard Mark Anderson
Dissertations and Theses @ UNI
The purpose of this study is to describe and analyze the results of using cadet teaching as a method of improving the multiplication proficiency of fourth grade students from Price Laboratory School and seventh grade students from Holmes Junior High who have difficulty with multiplication. A multiplication test designed by the investigator was administered to sixty fourth grade students and forty-four seventh grade students. As a result of this test, sixteen fourth grade students and sixteen seventh grade students were identified as having difficulty with multiplication. Eight of the fourth grade students and eight of the seventh grade students were …
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 …
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.
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 …
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.
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.
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.
Proetid Trilobite From The Boone Formation In Arkansas, John D. Taylor
Proetid Trilobite From The Boone Formation In Arkansas, John D. Taylor
Journal of the Arkansas Academy of Science
No abstract provided.
Osagean Trilobites In Arkansas, John D. Taylor
Osagean Trilobites In Arkansas, John D. Taylor
Journal of the Arkansas Academy of Science
No abstract provided.
Arkansas Trilobite From Lower Ordovician Rocks, John D. Taylor
Arkansas Trilobite From Lower Ordovician Rocks, John D. Taylor
Journal of the Arkansas Academy of Science
No abstract provided.
A Comparison Of Three Numerical Techniques Used For The Solution Of The Two-Point Boundary Value Problem, William Richard Krall
A Comparison Of Three Numerical Techniques Used For The Solution Of The Two-Point Boundary Value Problem, William Richard Krall
Masters Theses
"Three numerical approximation techniques, called the Initial step, Shooting, and Direct Finite Difference Techniques, respectively, are compared and discussed as they apply to the solution of both linear and non-linear boundary-value problems of the form y"=f(x,y,y') with endpoint conditions y(xo)=yo and y(xn)=yn. The techniques are compared with respect to speed and accuracy by comparing the solution of each problem considered four times, each time for a different increment value, and comparing the errors at four pivotal points chosen at equally spaced distances over the domain of the function, to give an indication of …
A Study Of Bifeo₃ And The Hall Effect In Bifeo₃ And Cds, Fred Hoerger Taylor
A Study Of Bifeo₃ And The Hall Effect In Bifeo₃ And Cds, Fred Hoerger Taylor
Masters Theses
"Pure samples of BiFeO₃ were heat treated in oxygen and nitrogen atmospheres in an attempt to reduce the conductivity of the samples. Dielectric constant and dissipation factor measurements, as a function of frequency, were made to determine whether the samples had been altered. A special high temperature Hall effect apparatus was constructed. Using this apparatus an upper limit for the Hall mobility in BiFeO₃ was established. The apparatus was also used for room temperature measurements of Ga-doped CdS samples. Resistivity measurements to be used with the Hall effect results were made on both the BiFeO₃ and the CdS samples. Hot-Point …
Infrared Related Solid State Studies, Donald George Rathbun
Infrared Related Solid State Studies, Donald George Rathbun
Masters Theses
"Infrared reflectivity measurements have been made on single crystal CdS. Classical dispersion analysis has been used in an analysis of the data to obtain the index of refraction, the extinction index, and the dispersion parameters. These are compared with previously published results. The procedure used in this analysis has been outlined for future reference. Also, the shallow donor impurity theory has been used to numerically calculate the d±1 levels for Si and Ge. The theory is extended for the case of the impurity in the bulk semiconductor and the d₀, d±2 and, for high n, the s, p₀, …
Design And Testing Of A Downhole Continuous Wave Generator, Cole L. Smith
Design And Testing Of A Downhole Continuous Wave Generator, Cole L. Smith
Masters Theses
"The continuous shear wave generator was designed to be the first instrument capable of producing a continuous high frequency signal below the weathered layer of the earth. This is to be accomplished by placing the instrument in a bore hole and lowering it below the weathered layer where the higher frequencies are severely attenuated. The generator produced a measurable signal output with the output force being approximately 11 pounds force. Testing of the generator showed the necessity of using a spring system with a low natural frequency. The testing also indicated several improvements which should be made in the generator …
A Study Of Bismuth Ferrate And Bismuth Manganate In Solid Solution With Lead Titanate, Harris C. Jones
A Study Of Bismuth Ferrate And Bismuth Manganate In Solid Solution With Lead Titanate, Harris C. Jones
Masters Theses
"A new sample holder for measuring the high frequency dielectric constant of ferroelectrics at high temperature was constructed. The new sample holder eliminated discontinuities in the slotted line and improved the electrical contact between the ceramic and brass components. Measurements of the high frequency dielectric constant of an aged sample of 90% BiFeO₃ - 10% PbTiO₃ were made as a function of temperature using the slotted line technique. The dissipation function for the aged sample was found to have a more normal behavior near the Curie point than the virgin samples previously measured. Resistivity measurements were made as a function …