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Physical Sciences and Mathematics Commons™

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University of Arkansas, Fayetteville

Journal

2011

Articles 1 - 9 of 9

Full-Text Articles in Physical Sciences and Mathematics

Factors That Contribute To Turbidity On The West Fork Of The White River In Arkansas, Chris Cotton, Brian Haggard Jan 2011

Factors That Contribute To Turbidity On The West Fork Of The White River In Arkansas, Chris Cotton, Brian Haggard

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

The West Fork of the White River (WFWR) exceeds the water quality standard for turbidity (10 NTU) set by the Arkansas Department of Environmental Quality and, since 1998, the river has been on Arkansas’s 303 (d) list of impaired water bodies unsuitable for aquatic life because of turbidity exceedances. To understand the factors that could be related to turbidity, total suspended solids (TSS), total inorganic suspended solids (TISS), total volatile suspended solids (TVSS), sestonic chlorophyll-a (Chl-a) concentrations, and turbidity were measured on three sample dates from nine sites on the WFWR. As the site location changed in the downstream direction, …

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Plant Growth In Soil Amended With Drilling Mud, Satoshi Takaki, Duane C. Wolf Jan 2011

Plant Growth In Soil Amended With Drilling Mud, Satoshi Takaki, Duane C. Wolf

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Extraction of natural gas generates drilling fluid and drilling mud that contain high concentrations of salts. Land application of the fluid and mud can have negative impacts on plant growth and soil properties. The objective of this study was to determine the effects of drilling mud on plant growth, plant chemical concentrations, and soil chemical properties. Sudangrass (Sorghum sudanense [Piper] Stapf [Piper]) and bermudagrass (Cynodon dactylon L.) were grown in a Roxana loam soil amended with 0%, 5%, or 10% (w/w) drilling mud in a 6-wk greenhouse study. Plant biomass production and concentrations of elements in biomass were determined. Electrical …

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Assessment And Characterization Of Physical Habitat, Water Quality, And Biotic Assemblages Of The Tyronza River, Arkansas, N. J. Wentz, N. D. Henderson, A. D. Christian Jan 2011

Assessment And Characterization Of Physical Habitat, Water Quality, And Biotic Assemblages Of The Tyronza River, Arkansas, N. J. Wentz, N. D. Henderson, A. D. Christian

Journal of the Arkansas Academy of Science

Few studies within the last few decades have addressed water quality and biotic assemblages within Arkansas’s large channel-altered deltaic rivers. The Tyronza River is located in northeast Arkansas and its watershed has a heavy agricultural presence that drastically affects habitat quality. Meanwhile, the Tyronza River hosts one of the more recent documented range extensions of the federally endangered fat pocketbook mussel [Potamilus capax (Green, 1832)]. The purpose of this study was to assess physical habitat, water quality, and biotic assemblages of the Tyronza River using the Arkansas Department of Environmental Quality’s (ADEQ) regional biometrics. Water samples were collected at 9 …

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Flux Variation Of Cosmic Muons, N. Ramesh, M. Hawron, C. Martin, A. Bachri Jan 2011

Flux Variation Of Cosmic Muons, N. Ramesh, M. Hawron, C. Martin, A. Bachri

Journal of the Arkansas Academy of Science

In the current paper, we analyzed the variation of cosmic radiation flux with elevation, time of the year and ambient temperature with the help of a portable cosmic muon detector, the construction of which was completed by a team from Southern Arkansas University (SAU) at Lawrence Berkeley National Laboratory (LBNL). Cosmic muons and gamma rays traverse two synchronized scintillators connected to two photomultiplier tubes (PMT) via light guides, and generate electronic pulses which we counted using a Data Acquisition Board (DAQ). Because muons are the product of collisions between high-energy cosmic rays and atmospheric nuclei, and therefore shower onto earth, …

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Effects Of Annealing On The Electronic Transitions Of Zns Thin Films, S. S. Chiad, W. A. Jabbar, N. F. Habubi Jan 2011

Effects Of Annealing On The Electronic Transitions Of Zns Thin Films, S. S. Chiad, W. A. Jabbar, N. F. Habubi

Journal of the Arkansas Academy of Science

Thin films of zinc sulphide were prepared using a flash evaporation technique. The obtained thin films were subjected to heat treatment to investigate the effect of annealing on the transmittance spectrum and the electronic transitions. It has been found that annealing affected the transmission spectrum and caused an increase in the direct optical band gap. The optical parameters, oscillator energy E0 and dispersion energy Ed were determined using the Wemple DiDomenico single oscillator model. The optical energy gap obtained from the Wemple and DiDomenico model was in good agreement with the optical energy gap proposed by the Tauc theory.

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Boundary Condition On Electron Temperature For Antiforce Current Bearing Waves, M. Hemmati, W. P. Childs, D. C. Waters, J. D. Counts, J. K. Schmitt Jan 2011

Boundary Condition On Electron Temperature For Antiforce Current Bearing Waves, M. Hemmati, W. P. Childs, D. C. Waters, J. D. Counts, J. K. Schmitt

Journal of the Arkansas Academy of Science

In our investigation of breakdown waves, we apply a one-dimensional, three-component, steady-state fluid model. The wave is considered to be shock fronted and the electrons are assumed to be the main element in propagation of the wave. In our fluid model, the electron gas temperature is assumed to be large enough to sustain the wave motion. Our set of fluid equations is composed of the equations of conservation of mass, momentum and energy plus the Poisson’s equation. This investigation involves breakdown waves for which a large current exist in the vicinity of the wave front. Existence of current behind the …

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Synthesis, Characterization, And Properties Of Homometallic Dinuclear Ruthenium Complex Containing Chloro-Phenanthroline And Bipyridine, A. A. Bhuiyan, S. Kudo Jan 2011

Synthesis, Characterization, And Properties Of Homometallic Dinuclear Ruthenium Complex Containing Chloro-Phenanthroline And Bipyridine, A. A. Bhuiyan, S. Kudo

Journal of the Arkansas Academy of Science

This paper deals with the synthesis and spectroscopic investigation of homometallic dinuclear ruthenium(II) complex containing chlorophenanthroline and bipyridine ligands. This bimetallic ruthenium polypyridine complex may be useful for biological electron transfer studies. Heteroleptic ruthenium monomer complex Ru(bpy)2(Cl-phen) (where bpy = 2,2’-bipyridine and Cl-phen = 5-chloro- 1,10-phenanthroline) was prepared in a two step procedure previously developed in our laboratory. This monomer complex was used to prepare the ruthenium dimer complex, (bpy)2Ru(phen-phen)Ru(bpy)2, by utilizing the Ni-catalyzed coupling reaction. Both the complexes were purified by column chromatography. The identity and the integrity of the complexes were confirmed by elemental analysis as well as …

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Clean Energy Water Disinfection For Small, Remote Rural Communities, Ryan M. Lee Jan 2011

Clean Energy Water Disinfection For Small, Remote Rural Communities, Ryan M. Lee

Inquiry: The University of Arkansas Undergraduate Research Journal

Access to drinking water is essential to all life, yet in many developing and remote communities, it is often contaminated with disease causing pathogens. This project was created in response to the annual WERC Environmental Design Competition. This year’s specific challenge was to develop human powered, stand-alone, effective, easily implemented, and economical water disinfection systems. Many technologies were evaluated; however, bleach and ultraviolet (UV) light treatments were determined to be most applicable to remote and impoverished communities. The Razorback Microcide WERC Crew designed and demonstrated two systems independently featuring bleach and UV disinfection technology. Both systems include a high capacity, …

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Implementing A Food Waste To Compost Program At The University Of Arkansas: An Economic Feasibility Analysis, Zoe Teague Jan 2011

Implementing A Food Waste To Compost Program At The University Of Arkansas: An Economic Feasibility Analysis, Zoe Teague

Inquiry: The University of Arkansas Undergraduate Research Journal

The University of Arkansas Fayetteville (UAF) is actively pursuing ways to increase sustainability on campus. Through the establishment of the Sustainability Council and campus centers, multiple projects are attempting to reduce the carbon footprint at UAF. One particular study is designed to eliminate food waste on campus through composting. The purpose of this study was to evaluate and project the economic savings of implementing a food waste composting system using Earth Tubs. Earth Tubs are an in-vessel electrical composting system capable of diverting up to 150 pounds of organic material daily with minimal odor. Results suggest that composting food waste …

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