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University of Arkansas, Fayetteville

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Articles 721 - 750 of 763

Full-Text Articles in Earth Sciences

Broad Spectrum Microwave Systems For Remotely Measuring Soil Moisture Content, W. P. Waite, K. R. Cook, B. B. Bryan Jan 1973

Broad Spectrum Microwave Systems For Remotely Measuring Soil Moisture Content, W. P. Waite, K. R. Cook, B. B. Bryan

Arkansas Water Resources Center Technical Reports

A theoretical and experimental study of the microwave reflectivity of soils with varying moisture content was conducted. A system was developed to measure reflectivity over a continuous frequency range of 4 to 26.5 GHz, at incidence angles from 10° to 70°, and with both horizontal and vertical polarization. The measurements were found to be extremely accurate for smooth homogeneous surfaces, however, the effects of surface roughness were found to be more severe than predicted due to the discontinuous nature of naturally occurring rough surfaces. An algorithm was developed which used the frequency dependence of the reflectivity to estimate the effective …

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Limnology Of Four Bauxite Open-Pit Lakes, George L. Harp, Ronald D. Hubbard Jan 1972

Limnology Of Four Bauxite Open-Pit Lakes, George L. Harp, Ronald D. Hubbard

Journal of the Arkansas Academy of Science

The aquatic flora and fauna and 18 physicochemical characteristics of four bauxite open-pit lakes were studied from September 1969 to August 1970. The least acid lake (pH 3.4-4.4) supported 49 different aquatic insects, plankton, and higher aquatic plants. The most acid lake (pH 2.7-3.2) supported only 26 different plants and animals. Bauxite open-pit lakes within the pH range studied appear to be as relatively unproductive as their coal strip-mine lake counterparts, with which they share physicochemical and biological characteristics. Benthic macrofaunal diversity and abundance appear to be related more closely to distribution and abundance of leaf detritus than to hydrogen-ion …

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Geoelectrical Possibilities Of Detecting Stream Channels In Carbonate Rocks, Reinhard K. Frohlich Jan 1972

Geoelectrical Possibilities Of Detecting Stream Channels In Carbonate Rocks, Reinhard K. Frohlich

Journal of the Arkansas Academy of Science

Several geoelectrical resistivity methods that may be used to determine the position and flow characteristics of underground water associated with carbonate bedrock and karst development are considered. The most promising method studied employs depth soundings patterned after Schlumberger. The plotting of half electrode separation against apparent resistivity yields a curve which may be used to discriminate between lateral and vertical inhomogeneities in bedrock. A network of depth soundings of this type ultimately may lead to a map that will show geoelectrical anisotropies that may be used to analyze subsurface water courses in carbonate rock.

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Taxonomic Note On Fossil Glyptostrobus In Northeastern Arkansas, Eugene B. Whittlake Jan 1972

Taxonomic Note On Fossil Glyptostrobus In Northeastern Arkansas, Eugene B. Whittlake

Journal of the Arkansas Academy of Science

Two papers by Brown (1936, 1962) are reviewed and discussed in relation to the validity of specific names applied to the fossil Glyptostrobus as found in North American deposits. Evidence is presented supporting the contention that G. nordenskioldi Brown n. comb, is the valid name for Glyptostrobus specimens from the Hooker site of northeastern Arkansas.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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Proetid Trilobite From The Boone Formation In Arkansas, John D. Taylor Jan 1968

Proetid Trilobite From The Boone Formation In Arkansas, John D. Taylor

Journal of the Arkansas Academy of Science

No abstract provided.

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Geomorphic Analogs And Climax Morphogenesis, H. F. Garner Jan 1967

Geomorphic Analogs And Climax Morphogenesis, H. F. Garner

Journal of the Arkansas Academy of Science

No abstract provided.

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Groundwater Aquifer Patterns And Valley Alluviation Along Mountain Fork Creek, Crawford County, Arkansas, H. F. Garner Jan 1966

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.

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Base-Level Control Of Erosion Surfaces, H. F. Garner Jan 1965

Base-Level Control Of Erosion Surfaces, H. F. Garner

Journal of the Arkansas Academy of Science

No abstract provided.

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Monadnocks, Divides And Ozark Physiography, James Harrison Quinn Jan 1965

Monadnocks, Divides And Ozark Physiography, James Harrison Quinn

Journal of the Arkansas Academy of Science

No abstract provided.

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Report On Some Iron And Nickel Minerals From The Soapstone Deposits Of Saline County, Arkansas, Phillip Wicklein, Alden B. Carpenter Jan 1965

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.

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Structural And Petrological Note On The Mazarn Synclinorium, Larry J. Lee Jan 1965

Structural And Petrological Note On The Mazarn Synclinorium, Larry J. Lee

Journal of the Arkansas Academy of Science

No abstract provided.

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Shale-Limestone Alteration In The Upper Portion Of The Fayetteville Formation Near Marshall, Arkansas, W. Bruce Saunders Jan 1965

Shale-Limestone Alteration In The Upper Portion Of The Fayetteville Formation Near Marshall, Arkansas, W. Bruce Saunders

Journal of the Arkansas Academy of Science

No abstract provided.

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Paleozoic Analogues Of Recent Carbonates, Tom Freeman Jan 1965

Paleozoic Analogues Of Recent Carbonates, Tom Freeman

Journal of the Arkansas Academy of Science

No abstract provided.

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Dimension Stone In Arkansas, Charles G. Stone, William J. Crouch Jan 1964

Dimension Stone In Arkansas, Charles G. Stone, William J. Crouch

Journal of the Arkansas Academy of Science

No abstract provided.

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Dicalcium Silicate (Brown Mud) As An Agricultural Liming Material, Lyell Thompson, V. H. Ledbetter Jan 1964

Dicalcium Silicate (Brown Mud) As An Agricultural Liming Material, Lyell Thompson, V. H. Ledbetter

Journal of the Arkansas Academy of Science

No abstract provided.

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New Lentil In Upper Fayetteville Formation, John D. Taylor Jan 1964

New Lentil In Upper Fayetteville Formation, John D. Taylor

Journal of the Arkansas Academy of Science

No abstract provided.

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Relationship Of Igneous Activity To Mineral Deposits In Arkansas, Charles G. Stone, Philip J. Sterling Jan 1963

Relationship Of Igneous Activity To Mineral Deposits In Arkansas, Charles G. Stone, Philip J. Sterling

Journal of the Arkansas Academy of Science

No abstract provided.

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Hypogene Clay And Mica Minerals Associated With Fault Zones In The Ouachita Mountains-Arkoma Basin Area, Arkansas, Charles G. Stone Jan 1963

Hypogene Clay And Mica Minerals Associated With Fault Zones In The Ouachita Mountains-Arkoma Basin Area, Arkansas, Charles G. Stone

Journal of the Arkansas Academy of Science

No abstract provided.

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Geology Along A Portion Of Highway 23, Madison County, Arkansas, J. A. Mcentire Iii Jan 1963

Geology Along A Portion Of Highway 23, Madison County, Arkansas, J. A. Mcentire Iii

Journal of the Arkansas Academy of Science

No abstract provided.

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Shear And Tension Fracture Patterns Of Northwest Arkansas, John F. Gibbons Jan 1962

Shear And Tension Fracture Patterns Of Northwest Arkansas, John F. Gibbons

Journal of the Arkansas Academy of Science

No abstract provided.

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