Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

University of Arkansas, Fayetteville

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 3031 - 3060 of 3133

Full-Text Articles in Physical Sciences and Mathematics

Fracture Pattern Analysis Employing Remote Sensing Techniques For Groundwater Movement With Environmental Applications: Preliminary Report, Bradford C. Hanson Jan 1972

Fracture Pattern Analysis Employing Remote Sensing Techniques For Groundwater Movement With Environmental Applications: Preliminary Report, Bradford C. Hanson

Journal of the Arkansas Academy of Science

The study will consist of determining the relationship between fracture patterns and porosity-permeability changes in carbonate rocks with emphasis on groundwater movement. These porosity-permeability changes will be measured by relative groundwater movement, in the form of either springs, artesian wells, municipal supplies, or private wells. Relationships will be determined by plotting the positions of the measuring sites and correlating these sites with mapped fractures. Water yield is expected to be markedly greater for sites along fracture traces than for those located at random.

Go to article

Stratigraphy And Sedimentary Structures Of A Middle Bloyd Fluvial Sandstone, Washington And Madison Counties, Arkansas, John M. Glenn Jan 1972

Stratigraphy And Sedimentary Structures Of A Middle Bloyd Fluvial Sandstone, Washington And Madison Counties, Arkansas, John M. Glenn

Journal of the Arkansas Academy of Science

A prominent quartz-pebble-bearing sandstone unit crops out at stream level along the East Fork of the White River in Madison County. Detailed geologic mapping indicates that the unit is stratigraphically positioned between the Brentwood and Dye Shale Members of the Bloyd Formation and is not the Greenland Member of the Winslow Fromation as previously supposed. Sedimentary textures and structures of the unit indicate that it was deposited by competent, unidirectional currents flowing in a southerly direction. These currents were related to a broad braided stream system.

Go to article

Conversion Of Six Chemical Water Tests From Manual To Automated Methods, Tom N. Palko Jan 1972

Conversion Of Six Chemical Water Tests From Manual To Automated Methods, Tom N. Palko

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

A Study Of Phytoplankton Dynamics In Lake Fayetteville As A Means Of Assessing Water Quality, Richard L. Meyer Aug 1971

A Study Of Phytoplankton Dynamics In Lake Fayetteville As A Means Of Assessing Water Quality, Richard L. Meyer

Arkansas Water Resources Center Technical Reports

Phytoplankton community was analyzed for seasonal and vertical distribution in Lake Fayetteville. This northwest Arkansas reservoir maintains a stable water level and chemical input with a relatively constant, slow overflow. Its source is groundwater seepage through a calcareous substrate with little contribution from the limited drainage basin. Phytoplankton community development with its associations and assemblages, chlorophylls -a, -b and c, and biomass distribution are described. The seasonal cycles of the chemical parameters NH4-N, NO2-N, NO3-N, ortho-phosphate, silicon, pH, HCO3- and total-alkalinity plus oxygen are described and discussed. The physical parameters of temperature, light and climate are included. The interaction of …

Go to article

Interim Report On Water Quality Investigation Degray Reservoir, Arkansas, J. Nix Jul 1971

Interim Report On Water Quality Investigation Degray Reservoir, Arkansas, J. Nix

Arkansas Water Resources Center Technical Reports

Impoundment of the Caddo River near Arkadelphia, Arkansas began in August, 1969. Detailed patterns of the dissolved oxygen distribution in this reservoir are presented for the period September, 1969 through April, 1971. Although the reservoir had not reached normal pool elevation, thermal stratification accompanied by severe hypolimnic oxygen depletion has been observed. The dissolved oxygen data show that an under flow occurs in the fall of the year and carries dissolved oxygen into the hypolimnic zone. The gradients of dissolved oxygen concentration observed during the winter indicate that the reservoir does not undergo complete mixing. A short summary of the …

Go to article

Environmental Changes Produced By Cold-Water Outlets From Three Arkansas Reservoirs, Carl E. Hoffman, Raj V. Kilambi Jan 1971

Environmental Changes Produced By Cold-Water Outlets From Three Arkansas Reservoirs, Carl E. Hoffman, Raj V. Kilambi

Arkansas Water Resources Center Technical Reports

Water qualities of two natural streams (Buffalo and Kings Rivers), one new coId-tailwater (Beaver), and two old coId-tailwaters (Norfork and Bull Shoals) in northwestern Arkansas were studied from July 1965 through October 1968. The essential difference between the old cold-tailwaters and natural streams is a change in water quality which allows the development of a new productive ecological environment. Features which typify the old tailwaters are as follows: (1) relatively homioithermal temperatures; (2) stream beds scoured by strong hydoelectric power generation currents; (3) abundant phytoplankton and benthic macroinvertebrates; and (4) absence of warm water game fishes. Environmental factors characterizing natural …

Go to article

Impoundment Effects On Water Quality As Reflected In Parasitism Of Reservoir Basses, David A. Becker Jan 1971

Impoundment Effects On Water Quality As Reflected In Parasitism Of Reservoir Basses, David A. Becker

Arkansas Water Resources Center Technical Reports

Our aquatic environments are rapidly becoming useless as natural resources through pollution from various sources. It is therefore necessary for us to further understand the various means which relate to this process. The interrelationships between the physico-chemical and biological water qualities undergo marked changes during the ageing of a reservoir. Eutrophication of these impoundments render them rela-tively useless as natural resources. It thus becomes apparent that we must gain further knowledge of these processes if we are to devise methods for proper reservoir management.

Go to article

Preparation Of O-Fluorobenzoic Acid. An Elementary Organic Laboratory Experiment, Frank L. Setliff Jan 1971

Preparation Of O-Fluorobenzoic Acid. An Elementary Organic Laboratory Experiment, Frank L. Setliff

Journal of the Arkansas Academy of Science

An experiment designed for organic chemistry students at the sophomore level is presented. The experiment, which involves no special equipment and which employs only inexpensive reagents, demonstrates the conversion of anthranilic acid to o-fluorobenzoic acid via the modified Schiemann Reaction.

Go to article

Consideration Of Macro-Climatic And Macro-Biotic Change In The Ozark Highlands During Post-Glacial Times, Kenneth W. Cole Jan 1971

Consideration Of Macro-Climatic And Macro-Biotic Change In The Ozark Highlands During Post-Glacial Times, Kenneth W. Cole

Journal of the Arkansas Academy of Science

Climatological, pedological and faunal investigations conducted in the Upper Midwest and the Ozark Highlands indicate that the environment to which man in the Ozarks was adapting over the past 12,000 years has undergone several major shifts, beginning with a cool-moist boreal forest situation followed by a period of warming and aridness resulting in prairie and deciduous forest climaxes and subsequently, in the last 4000-5000 years, change to the pattern reflected by present conditions.

Go to article

Digital Systems For On-Site Collection For Water Quality Analysis, M. K. Testerman Nov 1970

Digital Systems For On-Site Collection For Water Quality Analysis, M. K. Testerman

Arkansas Water Resources Center Technical Reports

A prototype system has been developed for recording and transmitting digital data at a remote water quality monitoring station in an unattended manner. As many as eight analog signals from transducers, which measure water quality characteristics such as dissolved oxygen, temperature, pH, chlorides, conductivity, redox, and turbidity, are converted to digital signals and recorded in binary coded decimal format on magnetic tape. This unit may be contacted from a central station for playback of the day's recording. The transmitted data can be recorded at the central station by teletype. Each data record includes a time-of-day "word" so that all data …

Go to article

Distribution Of Trace Elements In Impoundments, J. Nix Jan 1970

Distribution Of Trace Elements In Impoundments, J. Nix

Arkansas Water Resources Center 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 …

Go to article

Water Resources Planning Study For Arkansas And Oklahoma, L. R. Heiple, H. M. Jeffus Jan 1970

Water Resources Planning Study For Arkansas And Oklahoma, L. R. Heiple, H. M. Jeffus

Arkansas Water Resources Center 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.

Go to article

Undergraduate Research Program In Chemistry At Philander Smith College, James O. Wear Jan 1970

Undergraduate Research Program In Chemistry At Philander Smith College, James O. Wear

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Simple Algebraic Extensions And Characteristics Polynomials, Don Stokes Jan 1970

Simple Algebraic Extensions And Characteristics Polynomials, Don Stokes

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Optical Phenomena In Diatoms, Richard B. Hoover, Miriam J. Hoover Jan 1970

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.

Go to article

Eddy Bluff Shelter Of Beaver Reservoir Of Northwest Arkansas, James D. Morrison Jan 1970

Eddy Bluff Shelter Of Beaver Reservoir Of Northwest Arkansas, James D. Morrison

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Proceedings Of The Arkansas Academy Of Science - Volume 24 1970, Academy Editors Jan 1970

Proceedings Of The Arkansas Academy Of Science - Volume 24 1970, Academy Editors

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Apparatus For Dielectric Constant Measurements And Measurements For Water-Methanol Mixtures, James O. Wear Jan 1970

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

Go to article

Virus Movement In Groundwater Systems, William A. Drewry Sep 1969

Virus Movement In Groundwater Systems, William A. Drewry

Arkansas Water Resources Center 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 …

Go to article

Subsurface Irrigation Research In Arkansas, John P. Hoskyn, Billy B. Bryan Jun 1969

Subsurface Irrigation Research In Arkansas, John P. Hoskyn, Billy B. Bryan

Arkansas Water Resources Center 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 …

Go to article

On The Preparation And Properties Of Some 1,1-Dipheneyl-Syn,Trans-Truxane Derivatives, Frank L. Setliff Jan 1969

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.

Go to article

Middle Archaic Complex Of Northwest Arkansas, Michael A. Beckman Jan 1969

Middle Archaic Complex Of Northwest Arkansas, Michael A. Beckman

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Exact Test For Simple Correlation In Analysis Of Dispersion, James E. Dunn Jan 1969

Exact Test For Simple Correlation In Analysis Of Dispersion, James E. Dunn

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Biostratigraphy Of The Morrow Group Of Northern Arkansas, James Harrison Quinn Jan 1969

Biostratigraphy Of The Morrow Group Of Northern Arkansas, James Harrison Quinn

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Implications Of Land And Fresh-Water Gastropods In Archeological Sites, John W. Clark Jr. Jan 1969

Implications Of Land And Fresh-Water Gastropods In Archeological Sites, John W. Clark Jr.

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Biostratigraphy Of Peccary Cave, Newton County, Arkansas, Lee Carson Davis Jan 1969

Biostratigraphy Of Peccary Cave, Newton County, Arkansas, Lee Carson Davis

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Heterocyclic Aromatic Fluorides By A Modified Schiemann Method (1), Frank L. Setliff Jan 1968

Heterocyclic Aromatic Fluorides By A Modified Schiemann Method (1), Frank L. Setliff

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Osagean Trilobites In Arkansas, John D. Taylor Jan 1968

Osagean Trilobites In Arkansas, John D. Taylor

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Arkansas Trilobite From Lower Ordovician Rocks, John D. Taylor Jan 1968

Arkansas Trilobite From Lower Ordovician Rocks, John D. Taylor

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

Mathematics Of The Variation And Mole Ratio Methods Of Complex Determination, James O. Wear Jan 1968

Mathematics Of The Variation And Mole Ratio Methods Of Complex Determination, James O. Wear

Journal of the Arkansas Academy of Science

No abstract provided.

Go to article

First Prev Next Last