University of Arkansas

About: University of Arkansas is a education organization based out in Fayetteville, Arkansas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 17225 authors who have published 33329 publications receiving 941102 citations. The organization is also known as: Arkansas & UA.

Examining Recovery Trajectories After Sport-Related Concussion With a Multimodal Clinical Assessment Approach.

Abstract: BACKGROUND: Previous research estimates that the majority of athletes with sport-related concussion (SRC) will recover between 7 and 10 days after injury. This short temporal window of recovery is based predominately on symptom resolution and cognitive improvement and does not accurately reflect recent advances in the clinical assessment model. OBJECTIVE: To characterize SRC recovery at 1-week postinjury time intervals on symptom, neurocognitive, and vestibular-oculomotor outcomes and to examine sex differences in SRC recovery time. METHODS: A prospective, repeated-measures design was used to examine the temporal resolution of neurocognitive, symptom, and vestibular-oculomotor impairment in 66 subjects (age, 16.5 ± 1.9 years; range, 14-23 years; 64% male) with SRC. RESULTS: Recovery time across all outcomes was between 21 and 28 days after SRC for most athletes. Symptoms demonstrated the greatest improvement in the first 2 weeks, although neurocognitive impairment lingered across various domains up to 28 days after SRC. Vestibular-oculomotor decrements also resolved between 1 and 3 weeks after injury. There were no sex differences in neurocognitive recovery. Male subjects were more likely to be asymptomatic by the fourth week and reported less vestibular-oculomotor impairment than female subjects at weeks 1 and 2. CONCLUSION: When the recommended "comprehensive" approach is used for concussion assessment, recovery time for SRC is approximately 3 to 4 weeks, which is longer than the commonly reported 7 to 14 days. Sports medicine clinicians should use a variety of complementing assessment tools to capture the heterogeneity of SRC. ABBREVIATIONS: BESS, Balance Error Scoring SystemCI, confidence intervalDHI, Dizziness Handicap InventoryES, effect sizeImPACT, Immediate Post-Concussion Assessment and Cognitive TestPCSS, Post-Concussion Symptom ScaleSAC, Standard Assessment of ConcussionSRC, sport-related concussion. Language: en

Improvements of Biomass Physical and Thermochemical Characteristics via Torrefaction Process

Abstract: Various types of feedstocks such as straws and cotton gin waste are characterized by their low bulk density and relatively low energy content as well as irregular particle sizes and shapes. These factors impact the production of bioenergy from these fluffy feedstocks. The goal of this research is to improve the physical and thermochemical characteristics of biomass via torrefaction process. Torrefaction involves the heating of biomass to moderate temperature of 200 to 300°C in an inert atmosphere. Thus, the properties of the biomass undergo chemical and physical changes under torrefaction process. Several batches of wheat straw, rice straw, and cotton gin waste were torrefied at 260°C for 0, 15, 30, 45, and 60 min using a batch torrefaction system located at the bioenergy lab, Stuttgart, AR. Another set of experiments took place in which wheat straw was used as the feedstock. The effects of torrefaction temperature (200, 260, and 3Z5°C) and residence time (60, 120, and 180 min) on the physical and thermochemical characteristics of wheat straw were studied. During 1 hour torrefaction at 260°C, moisture content was reduced by 70.5%, 49.4%, and 48.6% for wheat straw, rice straw, and cotton gin waste, respectively. Insignificant reduction (<1.9%) of the volatile solids was observed under the same torrefaction conditions. The heating value increased by 25.3%, 16.9%, and 6.3% for wheat straw, rice straw, and cotton gin waste, respectively. Rice straw showed the highest weight loss of 30. 7% under the same torrefaction conditions. The second set of experiment showed that the torrefaction temperature have stronger effect compared with residence time. The highest heating value (22.75 MJ/kg) and the highest weight loss (54%) of wheat straw were observed at torrefaction temperature of 315°C and 3-h residence time. Also, improvement of size reduction was visually observed, which has the favorable properties for application for gasification and/or Pyrolysis.

Genetic structure and diversity of cultivated soybean (Glycine max (L.) Merr.) landraces in China

Abstract: The Chinese genebank contains 23,587 soybean landraces collected from 29 provinces. In this study, a representative collection of 1,863 landraces were assessed for genetic diversity and genetic differentiation in order to provide useful information for effective management and utilization. A total of 1,160 SSR alleles at 59 SSR loci were detected including 97 unique and 485 low-frequency alleles, which indicated great richness and uniqueness of genetic variation in this core collection. Seven clusters were inferred by STRUCTURE analysis, which is in good agreement with a neighbor-joining tree. The cluster subdivision was also supported by highly significant pairwise F st values and was generally in accordance with differences in planting area and sowing season. The cluster HSuM, which contains accessions collected from the region between 32.0 and 40.5°N, 105.4 and 122.2°E along the central and downstream parts of the Yellow River, was the most genetically diverse of the seven clusters. This provides the first molecular evidence for the hypotheses that the origin of cultivated soybean is the Yellow River region. A high proportion (95.1%) of pairs of alleles from different loci was in LD in the complete dataset. This was mostly due to overall population structure, since the number of locus pairs in LD was reduced sharply within each of the clusters compared to the complete dataset. This shows that population structure needs to be accounted for in association studies conducted within this collection. The low value of LD within the clusters can be seen as evidence that much of the recombination events in the past have been maintained in soybean, fixed in homozygous self-fertilizing landraces.

Interfacial behaviours between lithium ion conductors and electrode materials in various battery systems

Abstract: In recent years room temperature Li+ ion conductors have been intensively revisited in an attempt to develop solid state batteries that can be deployed for vehicle electrification. Through careful modification on materials synthesis, promising solid Li+ conductors with competitive ionic conductivity to those of liquid electrolytes have been demonstrated. However, the integration of highly conductive solid electrolytes into the whole system is still very challenging mainly due to the high impedance existing at different interfaces throughout the battery structure. Herein, this work focuses on the overview of the interfacial behaviors between lithium ion (Li-ion) conductors and cathode/anode materials. The origin, evolution and potential solutions to reduce these interfacial impedances are reviewed for various battery systems spanning from Li-ion, lithium sulfur (Li–S), lithium oxygen (Li–O2) batteries to lithium metal protection.

Who strikes back? A daily investigation of when and why incivility begets incivility.

Abstract: Incivility at work-low intensity deviant behaviors with an ambiguous intent to harm-has been on the rise, yielding negative consequences for employees' well-being and companies' bottom-lines. Although examinations of incivility have gained momentum in organizational research, theory and empirical tests involving dynamic, within-person processes associated with this negative interpersonal behavior are limited. Drawing from ego depletion theory, we test how experiencing incivility precipitates instigating incivility toward others at work via reduced self-control. Using an experience sampling design across 2 work weeks, we found that experiencing incivility earlier in the day reduced one's levels of self-control (captured via a performance-based measure of self-control), which in turn resulted in increased instigated incivility later in the day. Moreover, organizational politics-a stable, environmental factor-strengthened the relation between experienced incivility and reduced self-control, whereas construal level-a stable, personal factor-weakened the relation between reduced self-control and instigated incivility. Combined, our results yield multiple theoretical, empirical, and practical implications for the study of incivility at work. (PsycINFO Database Record