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Articles 4411 - 4440 of 5298
Full-Text Articles in Entire DC Network
Publication Policies And Suggestions For Authors, Academy Editors
Publication Policies And Suggestions For Authors, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Stabilization Of Polyvinyl Chloride By Some Conducting Polymers, Amit Shah, Brian C. Berry, Ali U. Shaikh
Stabilization Of Polyvinyl Chloride By Some Conducting Polymers, Amit Shah, Brian C. Berry, Ali U. Shaikh
Journal of the Arkansas Academy of Science
No abstract provided.
87th Annual Meeting, 2003. Program, Academy Editors
87th Annual Meeting, 2003. Program, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Winter And Spring Water Quality Of The Big Creek Watershed, Craighead County, Arkansas: Nutrients, Habitat, And Macroinvertebrates, Alan D. Christian, Jennifer L. Bouldin, Nate A. Bickford, Samuel B. Mccord, Aboubakar Sako, Jerry L. Farris, Lynn Kanieski, Ashley Mcbride
Winter And Spring Water Quality Of The Big Creek Watershed, Craighead County, Arkansas: Nutrients, Habitat, And Macroinvertebrates, Alan D. Christian, Jennifer L. Bouldin, Nate A. Bickford, Samuel B. Mccord, Aboubakar Sako, Jerry L. Farris, Lynn Kanieski, Ashley Mcbride
Journal of the Arkansas Academy of Science
The objective of this study was to assess the water quality of the Big Creek watershed during the winter and spring of 2002 by analyzing water physical, chemical variables, aquatic macro-invertebrates, and habitat. The Big Creek watershed, arising on Crowley's Ridge in northeast Arkansas, is a small deltaic watershed and is an area of intense cultivation. Four stations, Big Creek Upper (BCU), Mud Creek (MC),Lost Creek (LC), and Big Creek Lower (BCL) were established for this study from Big Creek, Mud Creek and Lost Creek. Water samples were collected on a weekly basis for 10 weeks from January 2002 through …
Journal Of The Arkansas Academy Of Science - Volume 57 2003, Academy Editors
Journal Of The Arkansas Academy Of Science - Volume 57 2003, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Antiforce Wave Profile For Quasi-Neutral Region, Mostafa Hemmati, Pashupati Adhikari, Jeremy Eckart, Marcus Ilbara
Antiforce Wave Profile For Quasi-Neutral Region, Mostafa Hemmati, Pashupati Adhikari, Jeremy Eckart, Marcus Ilbara
Journal of the Arkansas Academy of Science
This article will present a fluid dynamical theory for breakdown waves in which the direction of electric field force on electrons is in the opposite direction of wave propagation. We will refer to such waves as antiforce waves. The set of equations describing the model will include the equation of particle mass balance, equation of conservation of momentum, and equation of conservation of energy, coupled with Poisson's equation. This model treats the potential wave front as an electron shock wave propagating forward mainly due to the electron impact ionization. The shock front is succeeded by a thin dynamical transition region …
Genetic Relationships Of Some Common Arkansas Freshwater Sunfishes (Centrarchidae: Lepomis) Inferred From Restriction Endonuclease Analysis Of Mitochondrial Dna, Ronald L. Johnson, K. Ashlei Williams
Genetic Relationships Of Some Common Arkansas Freshwater Sunfishes (Centrarchidae: Lepomis) Inferred From Restriction Endonuclease Analysis Of Mitochondrial Dna, Ronald L. Johnson, K. Ashlei Williams
Journal of the Arkansas Academy of Science
Geographic isolation and habitat specialization has aided in the evolution and maintenance of genetic integrity of the lepomid sunfishes (Lepomis: Centrarchidae) of North America. Our goal was to measure genetic distances between four of the eleven extant sunfish species by using mitochondrial DNA analysis. Mitochondrial DNA restriction fragment length polymorphisms (RFLPs) were examined in bluegill (L. macrochirus), redear sunfish (L. microlophus), longear sunfish (L. megalotis), and green sunfish (L. cyanellus) using 15 restriction endonucleases. The largemouth bass (Micropterus salmoides) was used as an outgroup. The phylogeny inferred from Dollo parsimony cladistic analysis largely concurred with published results from allozyme analyses …
Concert Recording 2003-04-06, Emmaline Mcleod, Jeannie Lee, Gustavo Mendoza, Mercy Warris
Concert Recording 2003-04-06, Emmaline Mcleod, Jeannie Lee, Gustavo Mendoza, Mercy Warris
Concert Recordings & Programs
Sonate F-Dur / Georg Phillip Telemann -- Concertino, op. 107 / Cecile Chaminade -- First sonata / Bohuslav Martinu -- Odelette, op. 162 / Camille Saint-Saens -- Tango Etudes no. 4 and no. 5 / Astor Piazzolla -- Ballade / Frank Martin
Arkansas Water Resources Center Annual Technical Report, 2002, Arkansas Water Resources Center
Arkansas Water Resources Center Annual Technical Report, 2002, Arkansas Water Resources Center
Arkansas Water Resources Center Annual Report
No abstract provided.
Soils Of Mississippi County, Arkansas, J. M. Mckimmey, B. Dixon, H. D. Scott, C. M. Scarlat
Soils Of Mississippi County, Arkansas, J. M. Mckimmey, B. Dixon, H. D. Scott, C. M. Scarlat
AAES Research Reports and Research Bulletins
Along with air and water, soil contributes essential processes to the natural order of global cycles. With the exception of edibles from the sea, virtually everything we, and most other land-based animals, eat is derived from soil. Soil is a storage medium of essential minerals and nutrients for fulfilling our agricultural and nutritional needs. Humans work the soil to provide the basics of food, clothing, and shelter. We also use the soil as a medium to store and discard our waste. Virtually everything we do is in some way connected to soil
Illinois River 2001 Pollutant Loads At Arkansas Highway 59 Bridge, Marc A. Nelson, Thomas S. Soerens
Illinois River 2001 Pollutant Loads At Arkansas Highway 59 Bridge, Marc A. Nelson, Thomas S. Soerens
Arkansas Water Resources Center Technical Reports
Automatic water samplers and a U. S. Geological Survey gauging station were established in 1995 on the main stem of the Illinois River at the Arkansas Highway 59 Bridge. Since that time, continuous stage and discharge measurements and water quality sampling have been used to determine pollutant concentrations and loads in the Arkansas portion of the Illinois River. This report represents the results from the measurement and sampling for January 1, 2001 to December 31, 2001.
Illinois River Bmp Implementation & Phosphorus Management, Marc A. Nelson, Keith Trost
Illinois River Bmp Implementation & Phosphorus Management, Marc A. Nelson, Keith Trost
Arkansas Water Resources Center Technical Reports
No abstract provided.
Pesticide Ground Water Monitoring Project Phase Viii, K. F. Steele, M. A. Nelson, T. Nichols, R. Polite, H. D. Scott, Charles Armstrong
Pesticide Ground Water Monitoring Project Phase Viii, K. F. Steele, M. A. Nelson, T. Nichols, R. Polite, H. D. Scott, Charles Armstrong
Arkansas Water Resources Center Technical Reports
During Phase VIII monitoring (March 24, 2000 to June 30, 2001 ), 86 samples were collected from 77 new wells and 9 samples were collected from wells with previous detectable herbicide.
Partners, April 2002, Dale Bumpers College Of Agricultural, Food, And Life Sciences (University Of Arkansas, Fayetteville). Center Of Excellence For Poultry Science
Partners, April 2002, Dale Bumpers College Of Agricultural, Food, And Life Sciences (University Of Arkansas, Fayetteville). Center Of Excellence For Poultry Science
Partners
No abstract provided.
University Of Arkansas Catalog Of Studies, 2001-2002, University Of Arkansas, Fayetteville
University Of Arkansas Catalog Of Studies, 2001-2002, University Of Arkansas, Fayetteville
Undergraduate Catalog of Studies
No abstract provided.
Illinois River Phosphorus Sampling Results And Mass Balance Computation, Marc Nelson, K.L. White, T.S. Soerens
Illinois River Phosphorus Sampling Results And Mass Balance Computation, Marc Nelson, K.L. White, T.S. Soerens
Arkansas Water Resources Center Technical Reports
Phosphorus levels in the Illinois River are of great interest to the people of the States of Arkansas and Oklahoma. A great deal of effort has been expended to ascertain and modify the phosphorus impacts on the river. An automatic water sampling station was installed on the Illinois River just upstream from the State line in 1996 to accurately quantify the phosphorus in the Arkansas portion of the watershed. This paper summarizes five years worth of phosphorus sampling results at that site. In addition, a simple mass balance for phosphorus in the Illinois River Watershed above the sampling station was …
Foreword, Murray Smart Jr.
Foreword, Murray Smart Jr.
Inquiry: The University of Arkansas Undergraduate Research Journal
No abstract provided.
The Effects Of Enclosure Type On Aggressive Behavior In Captive Chimpanzees, Erica Renee Findley
The Effects Of Enclosure Type On Aggressive Behavior In Captive Chimpanzees, Erica Renee Findley
Inquiry: The University of Arkansas Undergraduate Research Journal
Male chimpanzees are known to be aggressively territorial in the wild. It is expected that the limited enclosures of captivity would make them even more aggressive. The Kansas City Zoo was chosen as an ideal venue to explore this assumption because it boasts the largest outdoor enclosure of its kind, and the apes alternate between this and much smaller indoor housing. Quantitative data on crowd size, time of day, temperature, and frequency/intensity/duration of aggressive behaviors were recorded for the alpha male in both enclosures during 300 hours of observation. These data were used to test the following hypotheses: as measured …
Chemical Composition Of Particles Of D < 0.20 Mu In The Lower Stratospheric Aerosol, Spring 1993, Joseph D. Scott, David M. Chittenden Ii
Chemical Composition Of Particles Of D < 0.20 Mu In The Lower Stratospheric Aerosol, Spring 1993, Joseph D. Scott, David M. Chittenden Ii
Journal of the Arkansas Academy of Science
The majority of the mass of stratospheric aerosol collected during the spring of 1993 consisted principally of particles of d >0.20 mu containing a mixture of H2SO4 and (NaK)2SO4. However, the composition of the more numerous particles with d< 0.2 mu was very different. X-ray emission spectra (EDS) of individual particles indicated that there were three different chemical populations of small particles. The most numerous population was almost all C with only traces of S and Na. The second population contained metal sulfates and chlorides, possibly accreted to a C-containing matrix. The third population consisted of S- and Cl- containing species and trace amounts of Na and K ions. The number of equivalents of metal ion was much less than that of S and Cl species, indicating that most of the S and Cl was not ionic, but was covalently bonded, perhaps to a C matrix.
Synthesis And Chemistry Of Naphthalene Annulated Trienyl Iron Complexes: Potential Anticancer Dna Alkylation Reagents, Traci Means
Synthesis And Chemistry Of Naphthalene Annulated Trienyl Iron Complexes: Potential Anticancer Dna Alkylation Reagents, Traci Means
Inquiry: The University of Arkansas Undergraduate Research Journal
Iron complex chemistry that opens a new door to the medicinal and pharmaceutical worlds is the aim of this research. Specifically, ortho-quinone methide moieties are intermediates in several antitumor drugs and have been identified as bioreductive alkylators of DNA. In our research, a class of iron compounds has been targeted to resemble these quinone methides. It is hoped that these new compounds could be modified to provide a window of opportunity toward the discovery of a selective mode of drug delivery. We have focused our efforts on generating a reactive transition metal complexed 5-membered ring analog of o-quinone methide based …
Inquiry: The University Of Arkansas Undergraduate Research Journal - Volume 3 - Fall 2002, Inquiry Editors
Inquiry: The University Of Arkansas Undergraduate Research Journal - Volume 3 - Fall 2002, Inquiry Editors
Inquiry: The University of Arkansas Undergraduate Research Journal
No abstract provided.
Extraction Of Silymarin Compounds From Milk Thistle (Silybum Marianum) Seed Using Hot, Liquid Water As The Solvent, J.F. Alvarez Barreto
Extraction Of Silymarin Compounds From Milk Thistle (Silybum Marianum) Seed Using Hot, Liquid Water As The Solvent, J.F. Alvarez Barreto
Inquiry: The University of Arkansas Undergraduate Research Journal
High value specialty chemicals are usually obtained from natural products by extracting with generally regarded as safe (GRAS) solvents. Because organic solvents are quite often used, high operating and disposal costs often occur. When compared to traditional solvents, water can be viewed as an interesting alternative because of its low operating and disposal costs. Milk thistle contains compounds (taxifolin, silychristin, silydianin, silybinin A and silybinin B) that display hepatoxic protection properties. This paper examines the batch extraction of silymarin compounds from milk thistle seed meal in 50'C, 70'C, 85'C and 100'C water as a function of time. For taxifolin, silychristin, …
Stimulation And Modeling Of Pond Formations On The Asteroid 433 Eros, Justin Thompson
Stimulation And Modeling Of Pond Formations On The Asteroid 433 Eros, Justin Thompson
Inquiry: The University of Arkansas Undergraduate Research Journal
"Ponds" are surface features that appear to be the result of the deposition of finer material on the asteroid's regolith, the layer of loose sediment that blankets the entire asteroid. Ponds were discovered by the NEAR Shoemaker spacecraft in January, 2001, on the asteroid 433 Eros. The objective of experimentation is to simulate the development of these ponds in the Andromeda planetary sciences environmental chamber. The Andromeda Chamber offers a unique ability to simulate surface environments that occur on Eros. The chamber was used to simulate the processes that occur as Eros emits gas through its outer surface, including the …
Promoting Foreign Direct Investment In Bulgaria, Vessela Kapoulian
Promoting Foreign Direct Investment In Bulgaria, Vessela Kapoulian
Inquiry: The University of Arkansas Undergraduate Research Journal
This paper examines the factors that favor Foreign Direct Investment ( FDI) in Bulgaria and recommends public policy changes that will enhance the international competitiveness of Bulgaria. Four factors that favor an increase in FDI in Bulgaria are clearly identified. First, although the economic environment is considered challenging compared to other countries in the region, Bulgaria enjoys political stability. Second, Bulgaria offers a low-cost, well-educated labor pool, although additional public investments in foreign language training may be needed. Third, there are investment opportunities for infrastructure development through privatization in the areas of energy, information technology (IT), and transportation. Bulgaria is …
Reduction Of Dendrite Formations To Improve The Appearance Of The Powder Cured Films For Automotive Industry, Alexandru S. Biris, C. U. Yurteri, Malay K. Mazumder, Robert A. Sims, P. H. Williams
Reduction Of Dendrite Formations To Improve The Appearance Of The Powder Cured Films For Automotive Industry, Alexandru S. Biris, C. U. Yurteri, Malay K. Mazumder, Robert A. Sims, P. H. Williams
Journal of the Arkansas Academy of Science
The appearance of powder-coated films is dependent upon powder chemistry and spraying parameters. One of the most important physical factors controlling the powder film appearance is the microdeposition of the powder particles on the grounded substrate. During the electrostatic deposition of powder, the formation of dendrites and agglomerates was observed; these formations have an adverse effect on the final film appearance and their elimination may result in smoother and glossier films. Dendrites are generated due to bipolar charging and inter-particulate electrostatic attractive forces. The corona charging technique is mostly used in industrial powder coating applications. At low corona voltages (- …
Journal Of The Arkansas Academy Of Science - Volume 56 2002, Academy Editors
Journal Of The Arkansas Academy Of Science - Volume 56 2002, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Profitability Of Variable Rate Phosphorus In A Two Crop Rotation, Jennie Popp, Terry W. Griffin, Michael P. Popp, William H. Baker
Profitability Of Variable Rate Phosphorus In A Two Crop Rotation, Jennie Popp, Terry W. Griffin, Michael P. Popp, William H. Baker
Journal of the Arkansas Academy of Science
The purpose of this study is to examine the profitability of variable rate phosphorus application on a rotation of rice (Oryza sativa) and soybeans (Glycine max) on fields comprised of clay and silt loam soils. Phosphorus was chosen because 1) farmers have recently been advised of the benefit of phosphorus applications on rice as well as soybeans, 2)recommended phosphorus application rates vary greatly between clay and silt loam soils and across rice and soybeans, and 3) the residual effects of phosphorus applications in a crop rotation affect the appropriateness of variable rate technology (VRT). A three phase simulation, regression and …
Publication Policies And Suggestions For Authors, Academy Editors
Publication Policies And Suggestions For Authors, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Electrostatic Microencapsulation Of Composite Particulate Materials For Manufacturing And Environmental Applications, S. De, M. Pritchett, Malay K. Mazumder, Robert A. Sims, C. U. Yurteri, Alexandru S. Biris, A. Rego
Electrostatic Microencapsulation Of Composite Particulate Materials For Manufacturing And Environmental Applications, S. De, M. Pritchett, Malay K. Mazumder, Robert A. Sims, C. U. Yurteri, Alexandru S. Biris, A. Rego
Journal of the Arkansas Academy of Science
Electrostatic microencapsulation is a dry coating process where two powders, one containing the fines and the other relatively larger particles, are separately dispersed in air and pre-charged with opposite polarity, using corona charging for electrostatic coagulation. These oppositely charged core and guest particles experience attractive electrostatic forces and generate composite particles. Preliminary experiments of electrostatic microencapsulation were performed using Anionic Exchange Resin (AG 1-X8) as the host particle and Red Toner (Omega 4000) as the guest particles. An electrostatic microencapsulation tower has been designed for generation of composite particles using particles of different particle size distribution.
Quantification Of Land-Use Impact On Stream Water Quality, Scott Dennis, Indrajeet Chaubey, Brian Haggard
Quantification Of Land-Use Impact On Stream Water Quality, Scott Dennis, Indrajeet Chaubey, Brian Haggard
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Accelerated eutrophication of Beaver Lake in northwest Arkansas is a major environmental concern. When developing watershed-management plans to protect lake water quality, it is important that linkages among land-use activities and water quality of tributary streams be quantified. This study assessed longitudinal base-flow and storm-flow water quality at War Eagle Creek and quantified linkages between stream water quality and land-use conditions within the War Eagle Creek sub-watershed of the Beaver Lake watershed. We collected six water samples: three from base-flow conditions and three from storm-flow conditions during Spring 2002. In general, concentrations of nitrate nitrogen (NO3-N), total N (TN), total …