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Conducting nanofibers of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/polyvinyl alcohol (PEDOT:PSS/PVA) were fabricated at room temperature and via electrospinning with diameters ranging from 100 to 300 nm. The nanofibers were irradiated with Gamma and X-rays for varying lengths of time and the change in conductivity was evaluated. Raman and Electron Spin Resonance spectroscopy of X-ray irradiated nanofibers were obtained to determine the mechanism of conductivity degradation. A decrease in molecular ordering as well as chain scission via chain cross-linking and free radical formation are the two most likely mechanisms for change in conductivity. These nanofibers are promising candidates for use in highly sensitive, real-time electrically based sensor for radiation detection. 相似文献
13.
Boehm Stephen L. II; Schafer Gwen L.; Phillips Tamara J.; Browman Kaitlin E.; Crabbe John C. 《Canadian Metallurgical Quarterly》2000,114(2):401
Neuromuscular impairment by ethanol likely involves complex effects on balance, gait, muscle strength, and other features of motor coordination. The present experiments showed that relative sensitivity to ethanol-induced motor impairment in serotonin 1B (5-HT1B) null mutant and control mice was task dependent. We found that ethanol-treated null mutant mice made fewer missteps on a balance beam than did ethanol-treated wild-type mice, and confirmed a previous finding of their lesser ethanol sensitivity in the grid test. The genotypes did not differ in ethanol sensitivity as measured by the screen test, static dowel, fixed-speed rotarod, accelerating rotarod, grip strength, or loss of righting reflex tests. These experiments suggest that within a behavioral domain, alternative tests of function are not equivalent, so multiple assessment tools should be used to avoid misinterpretation of gene function. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
14.
KJ Mertz D Trees WC Levine JS Lewis B Litchfield KS Pettus SA Morse ME St Louis JB Weiss J Schwebke J Dickes R Kee J Reynolds D Hutcheson D Green I Dyer GA Richwald J Novotny I Weisfuse M Goldberg JA O'Donnell R Knaup 《Canadian Metallurgical Quarterly》1998,178(6):1795-1798
To determine the etiology of genital ulcers and to assess the prevalence of human immunodeficiency virus (HIV) infection in ulcer patients in 10 US cities, ulcer and serum specimens were collected from approximately 50 ulcer patients at a sexually transmitted disease clinic in each city. Ulcer specimens were tested using a multiplex polymerase chain reaction assay to detect Haemophilus ducreyi, Treponema pallidum, and herpes simplex virus (HSV); sera were tested for antibody to HIV. H. ducreyi was detected in ulcer specimens from patients in Memphis (20% of specimens) and Chicago (12%). T. pallidum was detected in ulcer specimens from every city except Los Angeles (median, 9% of specimens; range, 0%-46%). HSV was detected in >/=50% of specimens from all cities except Memphis (42%). HIV seroprevalence in ulcer patients was 6% (range by city, 0%-18%). These data suggest that chancroid is prevalent in some US cities and that persons with genital ulcers should be a focus of HIV prevention activities. 相似文献
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G.R. Higginson M.R. Litchfield Jane Snaith 《International Journal of Mechanical Sciences》1976,18(9-10)
The load-displacement-time characteristics of cartilage are modelled in a simple analytical way, and the behavior under steady and oscillating loads is predicted numerically. Comparison with constant-load creep experiments shows fairly good agreement. The model predicts that under oscillating loads of typical physiological magnitude and frequency, the effect on displacement of fluid transport through the matrix is negligible in any one cycle. 相似文献
17.
E.A. Klavetter A.I. Liapts O.K. Crosser R.J. Litchfield 《Chemical Engineering Communications》1984,28(4):369-382
The modified dusty-gas model1.2 is used to describe the mass fluxes for zero and first order irreversible reactions with moles changes in heteroporous catalysts, and to estimate their effectiveness factors in the transition regime. It is shown that the effectiveness factors predicted by the dusty-gas model (homoporous model) are larger than those calculated by the modified dusty-gas model (heteroporous model), in some cases by about 30%. In the Knudsen and molecular regimes, the correction factors of the modified dusty-gas model approach unity and the two models predict the same values for the effectiveness factors.
Since many industrial catalysts are heteroporous and operate in the transition region of transport, the transport equations and calculational procedures presented in this work are relevant to reactor design. 相似文献
Since many industrial catalysts are heteroporous and operate in the transition region of transport, the transport equations and calculational procedures presented in this work are relevant to reactor design. 相似文献
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Quantitative GLC of triglycerides has been extended to natural fats containing both odd and even carbon number fatty acids.
A 1.83-m glass column containing 3.0% JXR silicone on 100/120 mesh Gas-Chrom Q resolved triglycerides differing by only one
carbon number. Peak resolution was significantly improved by hydrogenating each triglyceride sample prior to GLC analysis.
The triglycerides of four fish oils (mullet, tuna, menhaden, and pilchard) and one seed fat (Acanthosyris spinescens) containing odd carbon number fatty acids were analyzed by this technique. The method was also useful for determining the
triglyceride composition of the cyclopentene fatty acid oil fromHydnocarpus wightiana seeds.
Presented at the AOCS meeting, New Orleans, May, 1967 相似文献
20.
An intermittent corn drying process of drying-tempering-drying in a laboratory scale thin layer dryer was optimized. A time lag function was developed to describe the influence of tempering on the drying rate in the post-tempering drying period. Three dryer control strategies (1) a drying-rate-first strategy, (2) an energy-efficiency-first strategy, and (3) an equal-importance (rate/efficiency) strategy were investigated. Results showed that intermittent drying processes were optimal except when a high drying rate was desired. 相似文献