1,072 research outputs found
Changes in the physical, chemical, and organoleptic quality of Spanish peanuts due to heat inactivation
No full textThis study was designed to relate seed characteristics to product acceptance of peanuts. This was done by determining biological, physical, and chemical changes that occurred as a result of peanut curing and heat treatments at two stages of maturity. The statistical relationship of these attributes at the mature stage with organoleptic attributes was determined by submitting each attribute to a two-way analysis of variance test with interaction and by determining the correlation coefficients between all attributes. Internal hull surface color, kernel density, and light transmittance of peanut oil were significantly correlated to each other with respect to kernel maturity. A non-sacrificial index of peanut kernel maturity was developed by objectively measuring and relating the internal hull surface color of the peanuts to other attributes of quality. There were no major significant differences in mature and immature samples due to treatment alone. However, many of the evaluations indicated major differences due to maturity. These differences were emphasized and accentuated by the treatments but not caused by them. For example, kernel surface color of the immature kernels was consistently darker than the mature kernels, but the difference was initially there and the treatment only made the difference more apparent. Typically, as heat inactivation took place all indices of kernel quality indicated a deterioration. Outstanding among these indices were decreases in organoleptic acceptability and percent germination. A logical hypothesis is that the underlying causes are the same
Damage in CFRP composites subjected to simulated lighting strikes - Assessment of thermal and mechanical responses
No full textDamage is inflicted upon Carbon Fiber Reinforced Polymer (CFRP) composite laminates using simulated lightning strikes to investigate the resulting residual mechanical properties. Seven different CFRP laminate specimens were exposed to simulated lightning strikes using three different electric waveforms. The three waveforms imposed were the 10/350 μs waveform, which simulates the first return stroke during a direct strike according to IEC 61400–24 Ed1.0. The second was a unipolar long stroke component, and the third was a combination of the first return stroke and the long stroke. After exposure to lightning, coupon specimens were prepared for mechanical testing. The test specimens were subsequently subjected to compression and shear loading to determine the post-strike mechanical properties. The compression tests were conducted using uniaxial coupons in accordance with ASTM standard D6641. The shear tests were conducted using V-notch specimens utilizing an Iosipescu test rig in accordance with ASTM standard D5379. Digital Image Correlation was used to capture the strain fields on the surface of the specimens. The results of the material coupon tests are compared with test results from pristine CFRP coupon samples that were not exposed to any electrical current. The shear and compression strengths, compressive and shear stress-strain curves, compressive and shear moduli, and the maximum temperature on the CFRP specimens during lightning tests are presented and discussed. Key results include that the largest reduction of strength occurred in the specimens that were subjected to the largest current and specific energy. The specific energy correlated more closely to the observed reduction of residual strength than the charge, and the damaged specimens displayed a higher degree of nonlinear stress-strain behavior than the pristine specimens
Performance of logistic regression modeling: beyond the number of events per variable, the role of data structure
No full textReply to : Steyerberg EW, Schemper M, Harrell FE. Logistic regression modeling and the number of events per variable: selection bias dominates. J Clin Epidemiol. 2011 Dec;64(12):1464-5; author reply 1463-4. doi: 10.1016/j.jclinepi.2011.06.016. PMID: 22032755. which is a comment on : Courvoisier DS, Combescure C, Agoritsas T, Gayet-Ageron A, Perneger TV. Performance of logistic regression modeling: beyond the number of events per variable, the role of data structure. J Clin Epidemiol. 2011 Sep;64(9):993-1000. doi: 10.1016/j.jclinepi.2010.11.012. Epub 2011 Mar 16. PMID: 21411281. https://archive-ouverte.unige.ch/unige:25409</a
Enabling Efficient and Interoperable Control of IoBT Devices in a Multi-Force Environment
No full textEfficient application of Internet of Battlefield Things (IoBT) technology on the battlefield calls for innovative solutions to control and manage the deluge of heterogeneous IoBT devices. This paper presents an innovative paradigm to address heterogeneity in controlling IoBT and IoT devices, enabling multi-orce cooperation in challenging battlefield scenarios
Harrell, Jos. (Death, 1880-07-18)
No full textAddress: Montgomery Rd.Age at death: 10 moPg 69/1880/349/M W S/City/Dr. J. Jones/T. Mulvihill/St. Joseph's NewOriginal record filed in drawer labeled 'HANNO-HARRIS, F'
Universal monotonicity of eigenvalue moments and sharp Lieb-Thirring inequalities
No full textWe show that phase space bounds on the eigenvalues of Schrodinger operators can be derived from universal bounds recently obtained by E. M. Harrell and the author via a monotonicity property with respect to coupling constants. In particular, we provide a new proof of sharp Lieb-Thirring inequalities.MATHGEO
Studies on in vitro human T cell reactivity to antigens of mycobacterium tuberculosis
No full textStudies on Mycobacterium tuberculosis (MTB) antigens are important to improve immunodiagnostics and vaccine efficacy. A novel genome based strategy for antigen discovery is to relate what is highly expressed by bacilli in vivo or in vitro, to what is recognized by human T cells as antigens. As hypoxia is a relevant stimulus that MTB encounters in vivo, whole genome based transcriptional profiles of M. tuberculosis subject to prolonged hypoxia (described as the Enduring hypoxic response (EHR) were analyzed, to guide the discovery of novel potential anitgens, by a combined bioinformatic and empirical approach and to determine evidence of infection stage specific recognition
Characterization of water and wildlife strains as a subgroup of Campylobacter jejuni using DNA microarrays.
No full textCampylobacter jejuni is the leading cause of human bacterial gastroenteritis worldwide, but source attribution of the organism is difficult. Previously, DNA microarrays were used to investigate isolate source, which suggested a non-livestock source of infection. In this study we analysed the genome content of 162 clinical, livestock and water and wildlife (WW) associated isolates combined with the previous study. Isolates were grouped by genotypes into nine clusters (C1 to C9). Multilocus sequence typing (MLST) data demonstrated that livestock associated clonal complexes dominated clusters C1-C6. The majority of WW isolates were present in the C9 cluster. Analysis of previously reported genomic variable regions demonstrated that these regions were linked to specific clusters. Two novel variable regions were identified. A six gene multiplex PCR (mPCR) assay, designed to effectively differentiated strains into clusters, was validated with 30 isolates. A further five WW isolates were tested by mPCR and were assigned to the C7-C9 group of clusters. The predictive mPCR test could be used to indicate if a clinical case has come from domesticated or WW sources. Our findings provide further evidence that WW C. jejuni subtypes show niche adaptation and may be important in causing human infection
Disentangling expectancy effects from pharmacological effects using caffeine performance as a model
No full textBeliefs about the effects of drugs, or drug outcome expectancies, have been shown to modify the effects of drugs and placebos. In other words, cognitive and pharmacological effects both appear to be involved in the drug experience. This study investigated the independent and interactive effects of caffeine and instructional set on subjective and performance outcomes. Regular coffee drinkers (N = 60) were asked to abstain from caffeine overnight for at least 15 hours and were then randomly assigned to receive either caffeinated or decaffeinated coffee under double-blind conditions. This was crossed with varying instructions to participants that the coffee would either enhance or impair performance in a 2 X 2 factorial design. Even though a main effect for dose demonstrated that participants who received decaffeinated coffee demonstrated worse performance than those who received caffeinated coffee, among those given decaf, those told to expect impairment from coffee performed better than those told to expect enhancement. These findings add further support to the idea that drug expectancies play a role in drug outcomes.Source: Masters Abstracts International, Volume: 47-01, page: 5870.Adviser: Laura M. Juliano.Thesis (M.A.)--American University, 2008
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