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Articles 2341 - 2370 of 2433
Full-Text Articles in Physical Sciences and Mathematics
Optical Phenomena In Diatoms, Richard B. Hoover, Miriam J. Hoover
Optical Phenomena In Diatoms, Richard B. Hoover, Miriam J. Hoover
Journal of the Arkansas Academy of Science
Diatoms are unicellular algae which fabricate siliceous shells that are frequently marked with intricate ornamentations and patterns. The nature and characteristics of the siliceous shells provide a basis for diatom taxonomy and give rise to a number of interesting and colorful optical phenomena. This paper presents the results of investigations of diffraction phenomena, complementary color behavior, Rayleigh scattering and optical activity in diatoms.
Undergraduate Research Program In Chemistry At Philander Smith College, James O. Wear
Undergraduate Research Program In Chemistry At Philander Smith College, James O. Wear
Journal of the Arkansas Academy of Science
No abstract provided.
Apparatus For Dielectric Constant Measurements And Measurements For Water-Methanol Mixtures, James O. Wear
Apparatus For Dielectric Constant Measurements And Measurements For Water-Methanol Mixtures, James O. Wear
Journal of the Arkansas Academy of Science
A system for measuring dielectric constants has been constructed using a Sargent Oscillometer and an air bath for temperature control. The design and construction of the air bath as well as the temperature control achieved with it are described. The overall performance of the system including a computer program for forming the calculations is described. The system is one that requires calibration using two or more standard solvents and is good for both conducting and non-conducting liquids. Data are presented for water-methanol mixtures at 25 degrees with several points near pure methanol and also near pure water
Distribution Of Trace Elements In Impoundments, J. Nix
Distribution Of Trace Elements In Impoundments, J. Nix
Technical Reports
An investigation of the trace element content of two impoundments on the Ouachita River, Arkansas, was conducted. Common water quality parameters were followed in the reservoirs in an effort to determine the factors which were influencing the trace element concentration. The following trace metals were determined in both the particulate phase (retained by a 0.45 micron filter) and the soluble phase (passed by a 0.45 micron filter): iron, manganese, copper, cobalt, nickel, lead, chromium, and zinc. These measurements were made periodically for one and a half years. Results indicate that the chemical regime of the impoundments which were studied was …
Simple Algebraic Extensions And Characteristics Polynomials, Don Stokes
Simple Algebraic Extensions And Characteristics Polynomials, Don Stokes
Journal of the Arkansas Academy of Science
No abstract provided.
Eddy Bluff Shelter Of Beaver Reservoir Of Northwest Arkansas, James D. Morrison
Eddy Bluff Shelter Of Beaver Reservoir Of Northwest Arkansas, James D. Morrison
Journal of the Arkansas Academy of Science
No abstract provided.
Proceedings Of The Arkansas Academy Of Science - Volume 24 1970, Academy Editors
Proceedings Of The Arkansas Academy Of Science - Volume 24 1970, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Water Resources Planning Study For Arkansas And Oklahoma, L. R. Heiple, H. M. Jeffus
Water Resources Planning Study For Arkansas And Oklahoma, L. R. Heiple, H. M. Jeffus
Technical Reports
The purpose of this study is to make an appraisal of the local water resources in the Arkansas River Basin common to the two States of Arkansas and Oklahoma as defined by the Arkansas-Oklahoma Compact Committee (hereinafter referred to as "the Compact Committee"). A review, analysis, and correlation has been made of hydrologic data previously collected by others. Consideration is given to the evaluation at selected sites of the storage and potential use of existing water sources.
Virus Movement In Groundwater Systems, William A. Drewry
Virus Movement In Groundwater Systems, William A. Drewry
Technical Reports
The purpose of this study is to investigate the extent to which soil acts as an agent in the transmission of waterborne viruses. Since many waterborne outbreaks of viral diseases have involved small wellwater supplies contaminated by effluents from subsurface wastewater disposal systems, there is a great need for such information. Results of this study show that virus adsorption by soils is greatly affected by the pH, ionic strength, and soil-water ratio of the soil-water system and various soil properties. Also, it is shown that one cannot predict the relative virus adsorbing ability of a particular soil based on the …
Subsurface Irrigation Research In Arkansas, John P. Hoskyn, Billy B. Bryan
Subsurface Irrigation Research In Arkansas, John P. Hoskyn, Billy B. Bryan
Technical Reports
A pilot study conducted in 1963 indicated that (1) cotton yields could be increased by subirrigation, (2) drilled orifices were unsatisfactory because of internal plugging caused by burrs and drilling particles, and (3) operating pressures of 5 and 10 psi were excessive, and 5 psi probably should be considered as an upper-limit pressure. A greenhouse study of a subirrigation system indicated that 2 psi should, in general, for in-wall orifices, be considered as a lower-limit pressure when orifices are built into the pipe wall. The greenhouse study also indicated that a placement depth of 12 inches was preferable to 18 …
Middle Archaic Complex Of Northwest Arkansas, Michael A. Beckman
Middle Archaic Complex Of Northwest Arkansas, Michael A. Beckman
Journal of the Arkansas Academy of Science
No abstract provided.
Biostratigraphy Of The Morrow Group Of Northern Arkansas, James Harrison Quinn
Biostratigraphy Of The Morrow Group Of Northern Arkansas, James Harrison Quinn
Journal of the Arkansas Academy of Science
No abstract provided.
Implications Of Land And Fresh-Water Gastropods In Archeological Sites, John W. Clark Jr.
Implications Of Land And Fresh-Water Gastropods In Archeological Sites, John W. Clark Jr.
Journal of the Arkansas Academy of Science
No abstract provided.
Biostratigraphy Of Peccary Cave, Newton County, Arkansas, Lee Carson Davis
Biostratigraphy Of Peccary Cave, Newton County, Arkansas, Lee Carson Davis
Journal of the Arkansas Academy of Science
No abstract provided.
On The Preparation And Properties Of Some 1,1-Dipheneyl-Syn,Trans-Truxane Derivatives, Frank L. Setliff
On The Preparation And Properties Of Some 1,1-Dipheneyl-Syn,Trans-Truxane Derivatives, Frank L. Setliff
Journal of the Arkansas Academy of Science
No abstract provided.
Exact Test For Simple Correlation In Analysis Of Dispersion, James E. Dunn
Exact Test For Simple Correlation In Analysis Of Dispersion, James E. Dunn
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.
Osagean Trilobites In Arkansas, John D. Taylor
Osagean Trilobites In Arkansas, John D. Taylor
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.
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.
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.
Arkansas Water Resources: Supply, Use, And Research Needs, Jared Sparks
Arkansas Water Resources: Supply, Use, And Research Needs, Jared Sparks
Technical Reports
The purpose of this study is to identify Arkansas’ water resources research needs against an economic backdrop of water supply and use conditions existing in the state. In the aggregate Arkansas has an abundance of high quality water relative to present use. There are local conditions that give rise to water problems, but, in general, critical water problems in Arkansas are emergent and potential rather than actual. The causes of these problems are to be found, in large part, in the economic, legal, and social institutions surrounding water use--and particularly in the economic institutions. Research designed to improve economic efficiency …
Geomorphic Analogs And Climax Morphogenesis, H. F. Garner
Geomorphic Analogs And Climax Morphogenesis, H. F. Garner
Journal of the Arkansas Academy of Science
No abstract provided.
Characterization Of The Bivariate Negative Binomial Distribution, James E. Dunn
Characterization Of The Bivariate Negative Binomial Distribution, James E. Dunn
Journal of the Arkansas Academy of Science
No abstract provided.
Monte Carlo Study Of Estimation For Nonlinear Models Subjected To Linearizing Transformations, Jeff Kennington, James E. Dunn
Monte Carlo Study Of Estimation For Nonlinear Models Subjected To Linearizing Transformations, Jeff Kennington, James E. Dunn
Journal of the Arkansas Academy of Science
No abstract provided.
Quantitative Analysis Of Stream Flow Rate Extremes, Hugh M. Jeffus
Quantitative Analysis Of Stream Flow Rate Extremes, Hugh M. Jeffus
Technical Reports
Stream discharge data for the State of Arkansas is analyzed for representative statistical parameters. The statistical distribution most applicable to stream discharge data in Arkansas is the Pearson type III skew frequency curve. The parameters of the Pearson type III curve for all available records in Arkansas are included as Appendix A. The parameters of the logarithmically normal frequency distribution are included as Appendix B for mean daily discharge, minimum daily discharge and instantaneous minimum daily discharge. The logarithmically normal frequency distribution may be used for the lower discharge rates in lieu of the Pearson type III distribution except where …
Groundwater Aquifer Patterns And Valley Alluviation Along Mountain Fork Creek, Crawford County, Arkansas, H. F. Garner
Groundwater Aquifer Patterns And Valley Alluviation Along Mountain Fork Creek, Crawford County, Arkansas, H. F. Garner
Journal of the Arkansas Academy of Science
No abstract provided.
Base-Level Control Of Erosion Surfaces, H. F. Garner
Base-Level Control Of Erosion Surfaces, H. F. Garner
Journal of the Arkansas Academy of Science
No abstract provided.
Monadnocks, Divides And Ozark Physiography, James Harrison Quinn
Monadnocks, Divides And Ozark Physiography, James Harrison Quinn
Journal of the Arkansas Academy of Science
No abstract provided.
Report On Some Iron And Nickel Minerals From The Soapstone Deposits Of Saline County, Arkansas, Phillip Wicklein, Alden B. Carpenter
Report On Some Iron And Nickel Minerals From The Soapstone Deposits Of Saline County, Arkansas, Phillip Wicklein, Alden B. Carpenter
Journal of the Arkansas Academy of Science
No abstract provided.