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Articles 1 - 30 of 41
Full-Text Articles in Physical Sciences and Mathematics
Sfa Weather Station-November 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Sfa Weather Station-November 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Weather Station Data
No abstract provided.
Sfa Weather Station-October 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Sfa Weather Station-October 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Weather Station Data
No abstract provided.
Sfa Weather Station-September 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Sfa Weather Station-September 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Weather Station Data
No abstract provided.
Sfa Weather Station-August 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State Universit
Sfa Weather Station-August 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State Universit
Weather Station Data
No abstract provided.
Electron Transfer By Excited Benzoquinone Anions: Slow Rates For Two-Electron Transitions, Matibur Zamadar, Andrew R. Cook, Anna Lewandowska-Andralojc, Richard Holroyd, Yan Jiang, Jin Bikalis, John R. Miller
Electron Transfer By Excited Benzoquinone Anions: Slow Rates For Two-Electron Transitions, Matibur Zamadar, Andrew R. Cook, Anna Lewandowska-Andralojc, Richard Holroyd, Yan Jiang, Jin Bikalis, John R. Miller
Faculty Publications
Electron transfer (ET) rate constants from the lowest excited state of the radical anion of benzoquinone, BQ−•*, were measured in THF solution. Rate constants for bimolecular electron transfer reactions typically reach the diffusion-controlled limit when the free-energy change, ΔG°, reaches −0.3 eV. The rate constants for ET from BQ−•* are one-to-two decades smaller at this energy and do not reach the diffusion-controlled limit until −ΔG° is 1.5−2.0 eV. The rates are so slow probably because a second electron must also undergo a transition to make use of the energy of the excited state. Similarly, ET, from solvated electrons to neutral …
Sfa Weather Station-July 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Sfa Weather Station-July 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Weather Station Data
No abstract provided.
Sfa Weather Station-June 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Sfa Weather Station-June 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Weather Station Data
No abstract provided.
Sfa Weather Station-May 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Sfa Weather Station-May 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Weather Station Data
No abstract provided.
Economics And Attitude: The Effects Of Happiness On Economic Development, Chris Pace
Economics And Attitude: The Effects Of Happiness On Economic Development, Chris Pace
Undergraduate Research Conference
No abstract provided.
A Computational Study Of The Vibrational Spectra Of Mono-Nitrated Fluoranthenes, Jorge Ojeda
A Computational Study Of The Vibrational Spectra Of Mono-Nitrated Fluoranthenes, Jorge Ojeda
Undergraduate Research Conference
No abstract provided.
A Determination Of The Aspartame Content In Select Diet Beverages, Jorge Ojeda
A Determination Of The Aspartame Content In Select Diet Beverages, Jorge Ojeda
Undergraduate Research Conference
Millions of dollars are spent every year on diet beverages and there has been much controversy on the contents in these beverages, mainly the artificial sweetener aspartame. It is known that aspartame is included in many diet beverages, but the actual amount of aspartame used is not listed in the nutritional facts or provided by the beverage manufacturers. For this reason, the aspartame content of various soft drinks, Coke Zero, Pepsi Max, Diet Pepsi, and Pepsi Next, was analyzed and compared to a calibration plot utilizing Diet Coke as a standard. Diet Coke was used due to the unavailablity of …
Turrent Configurations And Particle Paths, Zihao Lawrence Jian
Turrent Configurations And Particle Paths, Zihao Lawrence Jian
Undergraduate Research Conference
The research originated from the question of how many rows of soldiers or turrets could be placed and allow for all turrets to have a projectile path. We find the relationship between the safe radius for each turret/soldier and the number of rows for which each soldier will have a clear projectile path. As shown, we place turrets in a grid configuration in the Cartesian plane.
Professor Salaries At Stephen F. Austin State University, Jami Miller
Professor Salaries At Stephen F. Austin State University, Jami Miller
Undergraduate Research Conference
When I and my group mates started this project, we thought that professor salaries would average $70,000. We also thought that all the following would be significant and positive influences on salary: being male, a full time professor, having a doctorate, and the college taught in.
K-12 Geoscience Workshops And Freshman Field Camp: Txkorp Outreach [Abstract], Kevin W. Stafford, Melinda G. Shaw-Faulkner, Wesley A. Brown
K-12 Geoscience Workshops And Freshman Field Camp: Txkorp Outreach [Abstract], Kevin W. Stafford, Melinda G. Shaw-Faulkner, Wesley A. Brown
Faculty Presentations
No abstract provided.
Geoanalytical Analysis Of Speleogenetic Development In The Owl Mountain And Nolan Creek Provinces: Fort Hood Military Installation, Texas (Abstract], Melinda G. Shaw-Faulkner, Kevin W. Stafford, Aaron W. Bryant
Geoanalytical Analysis Of Speleogenetic Development In The Owl Mountain And Nolan Creek Provinces: Fort Hood Military Installation, Texas (Abstract], Melinda G. Shaw-Faulkner, Kevin W. Stafford, Aaron W. Bryant
Faculty Presentations
No abstract provided.
Sfa Weather Station-April 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Sfa Weather Station-April 2013, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University
Weather Station Data
No abstract provided.
Geology Of The Western Llano Uplift, Fredericksburg To Mason, Texas, R. Larell Nielson, Chris Barker
Geology Of The Western Llano Uplift, Fredericksburg To Mason, Texas, R. Larell Nielson, Chris Barker
Faculty Publications
This year's Texas Academy of Science Geology Field Trip will visit six interesting locations in the Texas Hill Country (Figure 01). At Bear Mountain quarry, former location of Balanced Rock, the contact between the Precambrian Bear Mountain Pluton and surrounding Cretaceous Edwards Group will be examined. Along Crab Apple Creek, south of Enchanted Rock, excellent exposures of the Hickory Sandstone provide the opportunity to study sedimentary structures and cross-bedding that represent the Sauk sequence deposited during the Cambrian Period (Figure 02). Next we will look at a Gypsum Mine and deposits of evaporites from the Cretaceous Kirschberg Lagoon (Figure 03 …
Sfa Weather Station-March 2013, Arthur Temple College Of Forestry And Agriculture
Sfa Weather Station-March 2013, Arthur Temple College Of Forestry And Agriculture
Weather Station Data
No abstract provided.
Toward Designed Singlet Fission: Solution Photophysics Of Two Indirectly Coupled Covalent Dimers Of 1,3-Diphenylisobenzofuran, Justin C. Johnson, Akin Akdag, Matibur Zamadar, Xudong Chen, Andrew F. Schwerin, Irina Paci, Millicent B. Smith, Zdenek Havlas, John R. Miller, Mark A. Ratner, Arthur J. Nozik, Josef Michl
Toward Designed Singlet Fission: Solution Photophysics Of Two Indirectly Coupled Covalent Dimers Of 1,3-Diphenylisobenzofuran, Justin C. Johnson, Akin Akdag, Matibur Zamadar, Xudong Chen, Andrew F. Schwerin, Irina Paci, Millicent B. Smith, Zdenek Havlas, John R. Miller, Mark A. Ratner, Arthur J. Nozik, Josef Michl
Faculty Publications
In order to identify optimal conditions for singlet fission, we are examining the photophysics of 1,3- diphenylisobenzofuran (1) dimers covalently coupled in various ways. In the two dimers studied presently, the coupling is weak. The subunits are linked via the para position of one of the phenyl substituents, in one case (2) through a CH2 linker and in the other (3) directly, but with methyl substituents in ortho positions forcing a nearly perpendicular twist between the two joint phenyl rings. The measurements are accompanied with density functional theory (DFT) and timedependent DFT (TD-DFT) calculations. Although in neat solid state, 1 …
Sfa Weather Station-February 2013, Arthur Temple College Of Forestry And Agriculture
Sfa Weather Station-February 2013, Arthur Temple College Of Forestry And Agriculture
Weather Station Data
No abstract provided.
Caves And Karst Hydrology Of The Mariana Islands (Abstract), Kevin W. Stafford
Caves And Karst Hydrology Of The Mariana Islands (Abstract), Kevin W. Stafford
Faculty Publications
Abstract Attached
Evaporite Karst And Hydrogeology Of The Castile Formation: Culberson County, Texas And Eddy County, New Mexico, Kevin W. Stafford
Evaporite Karst And Hydrogeology Of The Castile Formation: Culberson County, Texas And Eddy County, New Mexico, Kevin W. Stafford
Faculty Publications
Karst development in Permian Castile evaporites has resulted in complex speleogenetic evolution with multiple phases of diagenetic overprinting. More than 10,000 surficial features, primarily sinkholes, occur throughout Culberson County, Texas, and Eddy County, New Mexico, based on GIS-analyses where laminated Castile sulfates crop out. Cave development is largely the result of hypogene processes, where ascending fluids from the underlying Bell Canyon Formation migrate near vertically through the Castile Formation, creating caves up to 100 meters deep and over 500 meters long, which have been breached through a combination of collapse and surface denudation. Numerous small and laterally limited epigene features …
Delineation And Classification Of Karst Depressions Using Lidar: Fort Hood Military Installation, Texas, Melinda G. Shaw-Faulkner, Kevin W. Stafford, Aaron W. Bryant
Delineation And Classification Of Karst Depressions Using Lidar: Fort Hood Military Installation, Texas, Melinda G. Shaw-Faulkner, Kevin W. Stafford, Aaron W. Bryant
Faculty Publications
The Fort Hood Military Installation is a karst landscape characterized by Cretaceous-age limestone plateaus and canyons in Bell and Coryell Counties, Texas. The area is located in the Lampasas Cut Plain region of the Edwards Plateau and is stratigraphically defined by exposures of the Fredericksburg Group. Spatial interpolation of 105 km2 of the Fort Hood Military Installation provided depression data that were delineated and classified using geoanalytical methods. Most of the karst features within the study area are predominantly surficial expressions of collapse features, creating windows into karst conduits with surficial exposures of epikarst spatially limited.
The increasing capabilities of …
Clastic Sinkhole And Pseudokarst Development In East Texas, Kevin W. Stafford, Melinda G. Shaw-Faulkner, Wesley A. Brown
Clastic Sinkhole And Pseudokarst Development In East Texas, Kevin W. Stafford, Melinda G. Shaw-Faulkner, Wesley A. Brown
Faculty Publications
Pseudokarst development in East Texas is controlled primarily by a combination of suffosion and preferential flow paths, often creating small ephemeral sinkholes but occasionally persistent features develop in more indurated facies. Pseudokarst occurs in Claiborne (Eocene) strata in Angelina, Cherokee, Nacogdoches, Panola, Rusk, San Augustine and Shelby counties. Strata consist of interbedded fine- and coarse-grained clastics with variable cementation and associated permeabilities.
Probability Inequalities For The Sum Of Random Variables When Sampling Without Replacement, Jeremy Becnel, Kent Riggs, Dean Young
Probability Inequalities For The Sum Of Random Variables When Sampling Without Replacement, Jeremy Becnel, Kent Riggs, Dean Young
Faculty Publications
Exponential-type upper bounds are formulated for the probability that the maximum of the partial sample sums of discrete random variables having finite equispaced support exceeds or differs from the population mean by a specified positive constant. The new inequalities extend the work of Serfling (1974). An example of the results are given to demonstrate their efficacy.
Synergistic Effects Of The Invasive Chinese Tallow (Triadica Sebifera) And Climate Change On Aquatic Amphibian Survival, Daniel Saenz, Erin M. Fucik, Matthew Kwiatkowski
Synergistic Effects Of The Invasive Chinese Tallow (Triadica Sebifera) And Climate Change On Aquatic Amphibian Survival, Daniel Saenz, Erin M. Fucik, Matthew Kwiatkowski
Faculty Publications
Changes in climate and the introduction of invasive species are two major stressors to amphibians, although little is known about the interaction between these two factors with regard to impacts on amphibians. We focused our study on an invasive tree species, the Chinese tallow (Triadica sebifera), that annually sheds its leaves and produces leaf litter that is known to negatively impact aquatic amphibian survival. The purpose of our research was to determine whether the timing of leaf fall from Chinese tallow and the timing of amphibian breeding (determined by weather) influence survival of amphibian larvae. We simulated a …
Sfa Star Charts, W D. Bruton
Sfa Star Charts, W D. Bruton
Faculty Publications
The SFA Start Charts are designed to work anywhere on Earth. Instructions are included on the last two pages. The constellations lines are based in part on those in a book called The Stars by H. A. Rey. These constellation patterns were adopted by Google Sky.
Sfa Weather Station-January 2013, Arthur Temple College Of Forestry And Agriculture
Sfa Weather Station-January 2013, Arthur Temple College Of Forestry And Agriculture
Weather Station Data
No abstract provided.
Ammonium Sulfate Precipitation Combined With Liquid Chromatography Is Sufficient For Purification Of Bovine Serum Albumin That Is Suitable For Most Routine Laboratory Applications, Odutayo O. Odunuge, Alina Shazhko
Ammonium Sulfate Precipitation Combined With Liquid Chromatography Is Sufficient For Purification Of Bovine Serum Albumin That Is Suitable For Most Routine Laboratory Applications, Odutayo O. Odunuge, Alina Shazhko
Faculty Publications
The use of bovine serum albumin (BSA) in routine biochemical assays such as restriction enzyme digestion and immunodetection is plagued largely by two common contaminants, DNase and immunoglobulins G (IgGs). Acetylation of BSA to inactivate DNase limits its use as a protein standard due to interference with color development in assays such as Lowry’s. In spite of the availability of inexpensive BSA, its purification involves several cumbersome and time-consuming steps. In this work, we employed a modified strategy of ammonium sulfate precipitation coupled with liquid chromatography to purify BSA that is free of DNase and IgGs. Purified BSA tested negative …
A Dft Study Of Vibrational Spectra And Mutagenicity Predictions Of Mononitrated Fluoranthenes [Abstract], Kefa Karimu Onchoke, Jorge Ojeda
A Dft Study Of Vibrational Spectra And Mutagenicity Predictions Of Mononitrated Fluoranthenes [Abstract], Kefa Karimu Onchoke, Jorge Ojeda
Faculty Publications
No abstract provided.