1,953 research outputs found
Rough rice for fattening cattle, sheep, and hogs
Cover title.Includes bibliographical references
Playing Video Games While Using or Feeling the Effects of Substances: Associations with Substance Use Problems
This study tested the hypothesis that playing video games while using or feeling the effects of a substanceâreferred to herein as âconcurrent useââis related to substance use problems after controlling for substance use frequency, video gaming as an enthusiastic hobby, and demographic factors. Data were drawn from a nationally representative online survey of adult video gamers conducted by Knowledge Networks, valid n = 2,885. Problem video game playing behavior was operationalized using Tejeiro Salguero and BersabĂ© MorĂĄnâs 2002 problem video game play (PVP) measure, and measures for substance use problems were taken from the National Survey of Drug Use and Health (NSDUH). Separate structural equation modeling analyses were conducted for users of caffeine, tobacco, alcohol, and marijuana. In all four models, concurrent use was directly associated with substance use problems, but not with PVP. Video gaming as an enthusiastic hobby was associated with substance use problems via two indirect paths: through PVP for all substances, and through concurrent use for caffeine, tobacco, and alcohol only. Results illustrate the potential for âdrug interactionâ between self-reinforcing behaviors and addictive substances, with implications for the development of problem use
Response of Feedlot Lambs to Chlortetracycline and Sulfamethazine
The objective of this experiment was to test the effects of chlortetracycline and sulfamethazine alone and in combination on feedlot performance and incidence of diseases of lambs weaned at an early age, shipped and finished in drylot with a high-concentrate ration
Studies of a Lacustrine-Volcanic Mars Analog Field Site with Mars-2020-like Instruments
On the upcoming Marsâ2020 rover two remote sensing instruments, MastcamâZ and SuperCam, and two microscopic proximity science instruments, SHERLOC and PIXL, will collect compositional (mineralogy, chemistry, and organics) data essential for paleoenvironmental reconstruction. The synergies between and limitations of these instruments were evaluated via study of a Mars analog field site in the Mojave Desert, using instruments approximating the data that will be returned by Marsâ2020. A ground truth dataset was generated for comparison to validate the results. The site consists of a succession of clayârich mudstones of lacustrine origin, interbedded tuffs, a carbonateâsilica travertine deposit, and gypsiferous mudstone strata. The major geological units were mapped successfully using simulated Marsâ2020 data. Simulated MastcamâZ data identified unit boundaries and Feâbearing weathering products. Simulated SuperCam passive shortwave infrared and green Raman data were essential in identifying major mineralogical composition and changes in lacustrine facies at distance; this was possible even with spectrally downsampled passive IR data. LIBS and simulated PIXL data discriminated and mapped major element chemistry. Simulated PIXL revealed mmâscale zones enriched in zirconium, of interest for age dating. SHERLOCâlike data mapped sulfate and carbonate at subâmm scale; silicates were identified with increased laser pulses/spot or by averaging of hundreds of spectra. Fluorescence scans detected and mapped varied classes of organics in all samples, characterized further with followâon spatially targeted deepâUV Raman spectra. Development of dedicated organics spectral libraries is needed to aid interpretation. Given these observations, the important units in the outcrop would be sampled and cached for sample return
Wound Debridement with 25 kHz Ultrasound
Several methods of wound debridement are described in the literature and are available to health care providers who specialize in wound management. Methods include the use of sharp surgical instruments; mechanical methods, such as whirlpool and pulsed lavage with suction; proteolytic and collagenolytic enzymes; autolysis; and sterile fly larvae (maggots). The use of surgical debridement is generally considered the most efficient method when performed by a skilled physician, who may in one session use his or her discretion to excise some viable tissue along with necrotic tissue in the wound. Sharp debridement performed in a clinical setting is a less aggressive procedure performed by physicians and other qualified health care practitioners. This method selectively removes eschar and slough as well as adherent fibrin, the latter with significant difficulty and time consumption. Frequently, sharp, selective removal of nonviable tissue is limited in efficacy owing to only partial removal of fibrin and/or intolerable pain experienced by the patient. The other debridement methods mentioned are primarily intended for selective removal of eschar, slough, and fibrin, of which fibrin may require several days to a few weeks for complete removal.
The purpose of this article is to describe a new type of debridement that uses ultrasound technology to remove necrotic tissue. In the authors\u27 preliminary experience, this method appears to have the potential to be a breakthrough for wound cleansing and debridement of adherent fibrin
Wigner Crystal State for the Edge Electrons in the Quantum Hall Effect at Filling
The electronic excitations at the edges of a Hall bar not much wider than a
few magnetic lengths are studied theoretically at filling . Both
mean-field theory and Luttinger liquid theory techniques are employed for the
case of a null Zeeman energy splitting. The first calculation yields a stable
spin-density wave state along the bar, while the second one predicts dominant
Wigner-crystal correlations along the edges of the bar. We propose an
antiferromagnetic Wigner-crystal groundstate for the edge electrons that
reconciles the two results. A net Zeeman splitting is found to produce canting
of the antiferromagnetic order.Comment: 22 pgs. of PLAIN TeX, 1 fig. in postscript, published versio
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