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Articles 4501 - 4530 of 5298
Full-Text Articles in Entire DC Network
Valuing Oil & Gas Properties, Robert M. Mcgowen
Valuing Oil & Gas Properties, Robert M. Mcgowen
Annual of the Arkansas Natural Resources Law Institute
No abstract provided.
Degrees Awarded At The University Of Arkansas, Fayetteville, 2000, University Of Arkansas, Fayetteville, University Of Arkansas, Fayetteville. Office Of The Registrar, University Of Arkansas, Fayetteville. Office Of Enrollment Services
Degrees Awarded At The University Of Arkansas, Fayetteville, 2000, University Of Arkansas, Fayetteville, University Of Arkansas, Fayetteville. Office Of The Registrar, University Of Arkansas, Fayetteville. Office Of Enrollment Services
Degrees Awarded at the University of Arkansas
No abstract provided.
Water Resources Issues In The Arkansas Delta, Kenneth F. Steele
Water Resources Issues In The Arkansas Delta, Kenneth F. Steele
Arkansas Water Resources Center Technical Reports
Despite its location in Northwest Arkansas, the Arkansas Water Resources Center (AWRC) is active state-wide. This fact is underscored by the focus of the Center’s session on "Water Resource Issues in the Arkansas Delta" during its recent joint Conference. Water issues in the Delta include declining water tables, salt water intrusion, and water quality (especially suspended sediment, nitrate and pesticides). Presented papers focused on best management practices for cotton production, economics of on-farm reservoirs, chloride content of irrigation water, and landowner education. The AWRC short course was an excellent one on chemical transport in the vadose zone by Dr. Glenn …
Double Cysteine Mutations In Staphylococcal Nuclease: The Effect Of Artificially Introduced Disulfide Bonds On Protein Structure And Stability, Anna Terry
Inquiry: The University of Arkansas Undergraduate Research Journal
Since a protein's function depends on its structure, basic research in protein structure facilitates the solution of many practical problems, such as the synthesis of more effective medicines. With this larger goal in sight, the purpose of this research project is to understand better the chemical principles that underlie protein structure and stability. Disulfide bonds are a potentially stabilizing feature of many proteins. They may form between cysteine residues in close proximity to one another if the orientation is favorable. Often found in proteins produced by organisms that grow at high temperatures, disulfide bonds may anchor side chains together, making …
Hammett Correlations Of The Amide Proton Chemical Shift In A Series Of 1-Tosyl-3-(4-Substituted Phenyl)Ureas, Frank L. Setliff, Melody K. Harrison
Hammett Correlations Of The Amide Proton Chemical Shift In A Series Of 1-Tosyl-3-(4-Substituted Phenyl)Ureas, Frank L. Setliff, Melody K. Harrison
Journal of the Arkansas Academy of Science
No abstract provided.
Preparation Of An Electrophilic 3-Methylindole Derivative: Difficulties In Forming A Stable, Suitable Material For The Preparation Of Tryptophan, Jason Boggs, Mariah Mcmasters, Robert W. Curley Jr., Michael J. Panigot
Preparation Of An Electrophilic 3-Methylindole Derivative: Difficulties In Forming A Stable, Suitable Material For The Preparation Of Tryptophan, Jason Boggs, Mariah Mcmasters, Robert W. Curley Jr., Michael J. Panigot
Journal of the Arkansas Academy of Science
In an attempt to prepare stereoselectively beta-deuterated tryptophan, N-protected indole-3-methanol compounds were prepared with model studies being done on undeuterated material. Conversion of these compounds to electrophilic species proved exceptionally difficult and resulted in very low yields or recovered starting material only. A summary of the current results utilizing N-tosyl indole-3-methanol will be presented as well as efforts using N-Boc indole-3-methanol.
An Analysis Of The Theory Of Functions Of One Real Variable, Robert J. Reed
An Analysis Of The Theory Of Functions Of One Real Variable, Robert J. Reed
Inquiry: The University of Arkansas Undergraduate Research Journal
Few undergraduates are aware that the Riemann integral taught in introductory calculus courses has only limited application-essentially this integral can be used only to integrate continuous functions over intervals. The necessity to integrate a broader class of functions over a wider range of sets that arises in many applications motivates the theory of abstract integration and functional analysis. The founder of this theory was the French mathematician Henri Lebesgue, who in 1902 defined the "Lebesgue measure" of subsets of the real line. The purpose of this project is to elucidate the theory of abstract measure spaces and of important spaces …
Inquiry: The University Of Arkansas Undergraduate Research Journal - Volume 1 - Fall 2000, Inquiry Editors
Inquiry: The University Of Arkansas Undergraduate Research Journal - Volume 1 - Fall 2000, Inquiry Editors
Inquiry: The University of Arkansas Undergraduate Research Journal
No abstract provided.
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.
Foreword, Murray Smart Jr.
Foreword, Murray Smart Jr.
Inquiry: The University of Arkansas Undergraduate Research Journal
No abstract provided.
Studies Of Tryptophans In Membrane- Spanning "Walp" Peptides By Deuterium Nmr Spectroscopy, Nichole Reed
Studies Of Tryptophans In Membrane- Spanning "Walp" Peptides By Deuterium Nmr Spectroscopy, Nichole Reed
Inquiry: The University of Arkansas Undergraduate Research Journal
WALP pep tides of sequence acetyl-Gly-Trp-Trp-(Leu-Ala)-Trp-Trp-Ala-ethanolamine insert into lipid bilayers as membrane-spanning a-helices and modulate the lipid phase behavior as functions of n and the lipid acyl chain length. A key feature of the WALP peptides is the positioning of tryptophan (Trp) indole rings at the membrane/water interface. For the examples WALP19 with n = 6.5 and WALP23 with n = 8.5, we have labeled individual indoles with deuterium and incorporated the labeled peptides in oriented, hydrated bilayers of Dimyristoyl-phosphatidylcholine (DMPC). Deuterium NMR spectra from these samples show sharp resonances when the membrane normal is aligned either parallel (Beta = …
Design, Implementation, And Evaluation Of Virtual Interface Architecture For Power Pc Machines, Ben Mckenzie
Design, Implementation, And Evaluation Of Virtual Interface Architecture For Power Pc Machines, Ben Mckenzie
Inquiry: The University of Arkansas Undergraduate Research Journal
The Virtual Interface Architecture (VIA) standard is a low-latency protocol that was designed for use in high-performance networks. VIA improves performance by reducing overhead in messaging. This research has two components. The first part of this research project is the development of a new tool for measuring the performance of a VIA implementation and comparing it to the more traditional high-overhead protocols used on the Internet. The development of the tool represents a significant contribution in and of itself, since the tool has been put into the public domain and will likely become useful by Lima users, both for measuring …
Journal Of The Arkansas Academy Of Science - Volume 54 2000, Academy Editors
Journal Of The Arkansas Academy Of Science - Volume 54 2000, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Wave Profile For Antiforce Class Ii Waves, Rory Roberts, Mostafa Hemmati
Wave Profile For Antiforce Class Ii Waves, Rory Roberts, Mostafa Hemmati
Journal of the Arkansas Academy of Science
Breakdown waves propagating in the opposite direction of the applied electric field force are referred to as antiforce waves. Breakdown waves moving into a pre-ionized medium are referred to as Class II waves. Using a one-dimensional, steady state, three-fluid, hydrodynamical model and considering the electrons as the main element in propagation of ionizing waves, we have derived the proper boundary conditions for antiforce waves moving into a preionized medium. Using the new boundary conditions and for several current values ahead of the wave, the set of electron fluid dynamical equations (equations of conservation of mass, momentum, and energy coupled with …
Hammett Correlations Of The Sulfonamide Proton Chemical Shift In A Series Of N-(Substituted Aryl)-P-Toluenesulfonamides, Frank L. Setliff, Tyson K. Spradlin
Hammett Correlations Of The Sulfonamide Proton Chemical Shift In A Series Of N-(Substituted Aryl)-P-Toluenesulfonamides, Frank L. Setliff, Tyson K. Spradlin
Journal of the Arkansas Academy of Science
No abstract provided.
Field Interpretation Of Latitude And Longitude In Arkansas: A Portable Coordinate Projection, William R. Teague
Field Interpretation Of Latitude And Longitude In Arkansas: A Portable Coordinate Projection, William R. Teague
Journal of the Arkansas Academy of Science
Two- and three-dimensional coordinate systems are fundamental to most quantitative mapping applications. The Geodetic, Universal Transverse Mercator (UTM),and State Plane systems have traditional roles in various science, surveying, and government agency engineering applications. The coordinates of three-dimensional Geodetic system are latitude, longitude, and height above ellipsoid (HAE).Because of its ability to cope with the intrinsically three dimensional character of the earth's surface, the Geodetic system is capable of supporting precise relative positioning and very high accuracy computations of distance between any two positions on or near the earth's surface. The two-dimensional UTMand State Plane systems are extremely useful for the …
Versatile Apparatus For Measuring Kinetics Of Gaseous Reactions By A Relative Method, Edmond W. Wilson Jr., Holly A. Sawyer, Amber A. Sawyer
Versatile Apparatus For Measuring Kinetics Of Gaseous Reactions By A Relative Method, Edmond W. Wilson Jr., Holly A. Sawyer, Amber A. Sawyer
Journal of the Arkansas Academy of Science
It is important that accurate, reproducible values for the rates of chemical reactions occurring in the atmosphere be obtained. The value of accurate kinetics measurements is to improve the accuracy of mathematical models used to forecast the state of the atmosphere. We describe a versatile, robust apparatus for obtaining atmospheric reaction rate values and their temperature dependencies by a relative method. This relative method has the advantage over absolute methods in that errors due to impurities and adsorption on walls of the reaction apparatus are minimized. In addition, relative values serve as an important verification for absolute values. The apparatus …
Hypothetical Origins Of Paleozoic Fossils From The Gulf Coastal Plain Of Arkansas, Karen Arbuckle
Hypothetical Origins Of Paleozoic Fossils From The Gulf Coastal Plain Of Arkansas, Karen Arbuckle
Journal of the Arkansas Academy of Science
A fauna of reworked Paleozoic fossils has been found in chert pebbles from the Gulf Coastal Plain in eastern Columbia County, Arkansas, although the nearest mapped exposure of Mississippian and Pennsylvanian rocks are fifty-five miles northward in the southern edge of the Ouachita Mountains. The surficial rocks at the collection site have been referred to the Claiborne Group of Eocene age by the authors of the geological map of Arkansas. Additional outcrops containing similar Paleozoic fossils have been found within a 15-mile radius. The fauna includes both lacy and twig-like bryozoans, articulate brachiopods, tabulate and rugose corals, stalked echinoderms, gastropods, …
Reaction Of Alpine-Borane With Aldehydes: Reactivity Rate Assessment By Observation Of The Disappearance Of The Carbonyl N - Pi* Peak By Uv-Visible Spectroscopy, Layla Bland, Michael J. Panigot
Reaction Of Alpine-Borane With Aldehydes: Reactivity Rate Assessment By Observation Of The Disappearance Of The Carbonyl N - Pi* Peak By Uv-Visible Spectroscopy, Layla Bland, Michael J. Panigot
Journal of the Arkansas Academy of Science
Due to an unexpectedly difficult reduction of indole-3-carbaldehyde and of isobutyraldehyde using the chiral reducing agent Alpine-Borane, the reactivity of several aliphatic, aromatic, and unsaturated aldehydes was investigated. This was done in order to determine whether there was a relationship between aldehyde structure and reduction rate. It was found that aliphatic aldehydes and aromatic aldehydes with no strongly electron-donating groups on the arene ring reduced faster than unsaturated aldehydes.
84th Annual Meeting, 2000. Secretary's Report And Financial Statement, Academy Editors
84th Annual Meeting, 2000. Secretary's Report And Financial Statement, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Physicochemical Characteristics And Macroinvertebrate Assemblages Of Riffles Upstream And Downstream Of A Streambank Impacted By Unrestricted Cattle Access, Ronald L. Johnson, Daniel D. Ward, Richard S. Grippo
Physicochemical Characteristics And Macroinvertebrate Assemblages Of Riffles Upstream And Downstream Of A Streambank Impacted By Unrestricted Cattle Access, Ronald L. Johnson, Daniel D. Ward, Richard S. Grippo
Journal of the Arkansas Academy of Science
Riparian zones are important contributors to stream ecosystem health. Alteration of such areas can change stream structure and function, resulting in modified productivity and hydrologic patterns. We studied two riffle sites on the South Fork of the Spring River in Fulton County, AR upstream and downstream of a streambank ostensibly degraded by unrestricted cattle access. The two sites were measured for differences in physical habitat (including bank width, stream velocity, depth, substrate composition, and embeddedness), chemical characteristics (including dissolved oxygen, pH, conductivity, turbidity and total suspended solids) and biological characteristics (including benthic macroinvertebrate community composition, similarity, and standing crop). Measurements …
Study Of The Amplitude Of Pressure And Thrust Oscillations In A Lab-Scale Hybrid Rocket, Ann Wright, Lawrence Dunn, Brian Alford, Justin Patton, M. Keith Hudson
Study Of The Amplitude Of Pressure And Thrust Oscillations In A Lab-Scale Hybrid Rocket, Ann Wright, Lawrence Dunn, Brian Alford, Justin Patton, M. Keith Hudson
Journal of the Arkansas Academy of Science
Hybrid rockets are being studied as a potential replacement for the solid rocket boosters on the NASA space shuttle. One physical characteristic of hybrid rockets that must be understood and overcome is potentially severe pressure oscillations during combustion. Pressure oscillations inside the rocket combustion chamber lead to oscillations in the thrust of the rocket. These oscillations are damaging to potential human passengers and cargo and must be minimized. Current theories surmise that the oscillations are caused by combustion chamber geometry, oxygen feed line parameters, and/or fuel combustion characteristics. This study focuses on the role of the fuel characteristics in pressure …
Large Pleistocene Box Turtle From Southwest Arkansas, Leo Carson Davis, John G. Scoggins, J. Alan Holman
Large Pleistocene Box Turtle From Southwest Arkansas, Leo Carson Davis, John G. Scoggins, J. Alan Holman
Journal of the Arkansas Academy of Science
No abstract provided.
Concert Recording 2000-04-26a, W. Dale Warren, Russell Pettitt, Brett Lawson, University Of Arkansas, Fayetteville. Concert Band
Concert Recording 2000-04-26a, W. Dale Warren, Russell Pettitt, Brett Lawson, University Of Arkansas, Fayetteville. Concert Band
Concert Recordings & Programs
National emblem march / E.E. Bagley -- Shenandoah / Frank Ticheli -- For the new day arisen / Steven Barton -- Prairie songs / Pierre La Plante -- Ave Maria / Franz Biebl -- Rikudim / Jan Van der Roost
Illinois River 1998 Nutrient And Suspended Sediment Loads At Arkansas Highway 59 Bridge, Marc A. Nelson, Thomas S. Soerens
Illinois River 1998 Nutrient And Suspended Sediment 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 (USGS) 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, 1998 to December 31, 1998.
Cavefish Population Status And Environmental Quality In Cave Springs Cave, Arkansas - Final Report Submitted To Arkansas Natural Heritage Commission, G. O. Graening, Arthur V. Brown
Cavefish Population Status And Environmental Quality In Cave Springs Cave, Arkansas - Final Report Submitted To Arkansas Natural Heritage Commission, G. O. Graening, Arthur V. Brown
Arkansas Water Resources Center Technical Reports
This report summarizes the continuing effort to monitor environmental quality in the Cave Springs Cave Natural Area and to implement the Ozark Cavefish Recovery Plan. Last year’s report (Brown et al., 1998) identified certain environmental stressors, including a trend over 15 years of increasing nutrient pollution, a low cavefish population count of only 106, and the presence of heavy metals in the cave water and one semi-volatile organic compound (the phthalate DEHP at 500 ppb) in resident crayfish tissue. This year’s monitoring effort demonstrates that fecal coliforms continue to exceed Arkansas State Water Quality Standards (Regulation 2), sometimes by a …
Influence Of Nitrogen Rate And Sampling Date On Soil Analysis Values Of Highbush Blueberries, John R. Clark, Ronald W. Mcnew, Richard C. Maples
Influence Of Nitrogen Rate And Sampling Date On Soil Analysis Values Of Highbush Blueberries, John R. Clark, Ronald W. Mcnew, Richard C. Maples
AAES Research Reports and Research Bulletins
Three studies were conducted on nitrogen (N) fertilization effects on soil of highbush blueberries in Arkansas. Objectives included: 1) determination of varying N rate effects on the standard soil analysis variables, 2) determination of date of soil sampling effects on soil analyses, 3) evaluation of the interactions of N rate and time of sampling, and 4) determination of changes in soil content over years. This research was done in two of the more important highbush blueberry production areas in Arkansas: the Arkansas River Valley where blueberries are grown on sandy loam soils, and northwest Arkansas where production is more common …
Minutes Of The Faculty Senate Meeting, May 26, 1999, University Of Arkansas, Fayetteville. Faculty Senate
Minutes Of The Faculty Senate Meeting, May 26, 1999, University Of Arkansas, Fayetteville. Faculty Senate
Faculty Senate Minutes
No abstract provided.
Arkansas Animal Science Department Report 1998, Stacey Gunter
Arkansas Animal Science Department Report 1998, Stacey Gunter
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
Arkansas Soil Fertility Studies 1998, Wayne Sabbe
Arkansas Soil Fertility Studies 1998, Wayne Sabbe
Arkansas Agricultural Experiment Station Research Series
Rapid technological changes in crop management and production require that the research efforts also be presented in an expeditious manner. The contributions of soil fertility and fertilizers are major production factors in all Arkansas crops. The studies contained within will allow producers to compare their practices with the university’s research efforts. Additionally, soil test data and fertilizer sales are presented to allow comparisons among years, crops, and other areas within Arkansas.