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Search Results: 1 - 10 of 404444 matches for " J. H. Edgar "
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Design and experimental validation of a compact collimated Knudsen source
Steinar H W Wouters,Gijs ten Haaf,Peter H A Mutsaers,Edgar J D Vredenbregt
Physics , 2015,
Abstract: In this paper we discuss the design and performance of a collimated Knudsen source which has the benefit of a simple design over recirculating sources. Measurements of the flux, transverse velocity distribution and brightness at different temperatures were conducted to evaluate the performance. The scaling of the flux and brightness with the source temperature follow the theoretical predictions. The transverse velocity distribution in the transparent operation regime also agrees with the simulated data. The source was found able to produce a flux of $10^{14}$ s$^{-1}$ at a temperature of 433 K. Furthermore the transverse reduced brightness of an ion beam with equal properties as the atomic beam reads $1.7 \times 10^2$ A/(m${}^2$ sr eV) which is sufficient for our goal: the creation of an ultra-cold ion beam by ionization of a laser-cooled and compressed atomic rubidium beam.
Inter-Observer Agreement on Subjects' Race and Race-Informative Characteristics
Heather J. H. Edgar, Shamsi Daneshvari, Edward F. Harris, Philip J. Kroth
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0023986
Abstract: Health and socioeconomic disparities tend to be experienced along racial and ethnic lines, but investigators are not sure how individuals are assigned to groups, or how consistent this process is. To address these issues, 1,919 orthodontic patient records were examined by at least two observers who estimated each individual's race and the characteristics that influenced each estimate. Agreement regarding race is high for African and European Americans, but not as high for Asian, Hispanic, and Native Americans. The indicator observers most often agreed upon as important in estimating group membership is name, especially for Asian and Hispanic Americans. The observers, who were almost all European American, most often agreed that skin color is an important indicator of race only when they also agreed the subject was European American. This suggests that in a diverse community, light skin color is associated with a particular group, while a range of darker shades can be associated with members of any other group. This research supports comparable studies showing that race estimations in medical records are likely reliable for African and European Americans, but are less so for other groups. Further, these results show that skin color is not consistently the primary indicator of an individual's race, but that other characteristics such as facial features add significant information.
Upregulated Genes In Sporadic, Idiopathic Pulmonary Arterial Hypertension
Alasdair J Edgar, Matilde R Chacón, Anne E Bishop, Magdi H Yacoub, Julia M Polak
Respiratory Research , 2006, DOI: 10.1186/1465-9921-7-1
Abstract: Peripheral lung samples were obtained immediately after removal from patients undergoing lung transplant for IPAH without familial disease, and control tissues consisted of similarly sampled pieces of donor lungs not utilised during transplantation. Pools of lung mRNA from IPAH cases containing plexiform lesions and normal donor lungs were used to generate the tester and driver cDNA libraries, respectively. A subtracted IPAH cDNA library was made by SSH. Clones isolated from this subtracted library were examined for up regulated expression in IPAH using dot blot arrays of positive colony PCR products using both pooled cDNA libraries as probes. Clones verified as being upregulated were sequenced. For two genes the increase in expression was verified by northern blotting and data analysed using Student's unpaired two-tailed t-test.We present preliminary findings concerning candidate genes upregulated in IPAH. Twenty-seven upregulated genes were identified out of 192 clones examined. Upregulation in individual cases of IPAH was shown by northern blot for tissue inhibitor of metalloproteinase-3 and decorin (P < 0.01) compared with the housekeeping gene glyceraldehydes-3-phosphate dehydrogenase.Four of the up regulated genes, magic roundabout, hevin, thrombomodulin and sucrose non-fermenting protein-related kinase-1 are expressed specifically by endothelial cells and one, muscleblind-1, by muscle cells, suggesting that they may be associated with plexiform lesions and hypertrophic arterial wall remodelling, respectively.In pulmonary hypertension (PAH), the mean resting pulmonary arterial pressure is greater than 25 mm Hg in contrast to the normal adult pulmonary circulation which has little resting vascular tone. The disease is also characterised by an absence of a significant pulmonary vasodilator response [1]. Many precapillary pulmonary arteries are affected by plexiform lesions, medial hypertrophy, intimal fibrosis and microthrombosis. PAH is a rare, often fatal cond
Impacto de la orientación al aprendizaje en la innovación de las MIPYMES colombianas
Contreras Palacios,Fred D.; Gálvez Albarracín,Edgar J.; González-Campo,Carlos H.;
Cuadernos de Administración (Universidad del Valle) , 2012,
Abstract: multiple studies worldwide show that innovation is a source of competitive advantage and it is, therefore, important to know the factors that stimulate it. that is why the research presented here seeks to analyze the effect of organizational learning orientation on business innovation. this empirical study was conducted with 403 colombian smes. the results obtained through multiple linear regression showed a highly positive effect on the relationship studied, which has important implications for employers, academia, and government, as told to a management style that encourages such practices in the organization divergence, the generation of new ideas, risk taking, knowledge sharing, cooperation agreements with universities and other companies, openness, experimentation and continuous change generate better innovation performance
Efecto del carácter multifoliolado sobre el rendimiento y sus componentes en generaciones tempranas de soya y determinación de parámetros genéticos en generación F3
Carvajal G. Héctor R.,Restrepo J. Diego,Agudelo D. Orlando,Estrada Edgar Iván
Acta Agronómica , 1987,
Abstract: Se realizó un experimento en soya, con el fin de indagar sobre el funcionamiento del modelo de herencia propuesto por Fehr (1972) para la condición genética hoja multifoliolada, al mismo tiempo conocer la posible influencia que podría tener su expresión en generaciones tempranas (F2 y F3) sobre un grupo de características agronómicas, entre ellas el rendimiento y sus componentes, cuando se compara con genotipos normales o trifolioladas. Se determinaron los parámetros genéticos en la generación F3 para las características evaluadas en tres cruzamientos. An experiment with soybean was carried out with the objetive to inquire about the functioning of the heredity model proposed by Fehr (1972) for the genetic condition leaf multifoliolate, and at the same time to know the possible influence that could have their expression in early generations (F2 and F3) on a group of agronomic characteristics such as yield and their components when compared with normal genenotypes or trifoliolates, genetics for the characteristics evaluated in three crossing.
Normalized Ghost Imaging
Baoqing Sun,Stephen S. Welsh,Matthew P. Edgar,Jeffrey H. Shapiro,Miles J. Padgett
Physics , 2012, DOI: 10.1364/OE.20.016892
Abstract: We present an experimental comparison between different iterative ghost imaging algorithms. Our experimental setup utilizes a spatial light modulator for generating known random light fields to illuminate a partially-transmissive object. We adapt the weighting factor used in the traditional ghost imaging algorithm to account for changes in the efficiency of the generated light field. We show that our normalized weighting algorithm can match the performance of differential ghost imaging.
Perfect interference-less absorption at infrared frequencies by a van der Waal's crystal
D. G. Baranov,J. H. Edgar,Tim Hoffman,Nabil Bassim,Joshua D. Caldwell
Physics , 2015, DOI: 10.1103/PhysRevB.92.201405
Abstract: Traditionally, efforts to achieve perfect absorption have required the use of complicated metamaterial-based structures as well as relying on destructive interference to eliminate back reflections. Here, we have demonstrated both theoretically and experimentally that such perfect absorption can be achieved using a naturally occurring material, hexagonal boron nitride (hBN) due to its high optical anisotropy without the requirement of interference effects to absorb the incident field. This effect was observed for p-polarized light within the mid-infrared spectral range, and we provide the full theory describing the origin of the perfect absorption as well as the methodology for achieving this effect with other materials. Furthermore, while this is reported for the uniaxial crystal hBN, this is equally applicable to biaxial crystals and more complicated crystal structures. Interference-less absorption is of fundamental interest to the field of optics; moreover, such materials may provide additional layers of flexibility in the design of frequency selective surfaces, absorbing coatings and sensing devices operating in the infrared.
Book Reviews
B.J. Boland,G.F. Pijper,H.J.M. Claessen,Francis Edgar Williams
Bijdragen tot de Taal-, Land- en Volkenkunde , 1978,
Abstract: - B.J. Boland, G.F. Pijper, Studi n over de geschiedenis van de Islam in Indonesia, 1900-1950. Leiden: E.J. Brill, 1977. 160 pp., 10 ill. - H.J.M. Claessen, Francis Edgar Williams, “The Vailala Madness” and other essays. Edited and with an introduction by Erik Schwimmer. London: C. Hurst and Company. 1976. 432 pp. Maps, bibliography, index. - J.E. van Lohuizen-de Leeuw, A.J. Bernet Kempers, Ageless Borobudur - Buddhist mystery in stone - Decay and restoration - Mendut and Pawon - Folklife in ancient Java. Katwijk aan Zee, Servire, 1976. 288 pp., 225 illustrations. - A. de Ruijter, G.N. Appell, The societies of Borneo. Explorations in the theory of cognatic social structure. A special publication of the American Anthropological Association, number 6, Washington, 1976. 160 pp.
The Effect of a New Placement Process on Student Success in First Semester Calculus  [PDF]
Edgar J. Fuller, Jessica M. Deshler
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.49B005
Abstract:

In this work we describe the placement testing and student intake process at a large, land-grant university and show that long-standing general assessment exams administered during secondary schooling are not accurate predictors of success in university level mathematics courses. We then present results indicating that a placement exam administered during arrival as a first-year student provides a strong indicator of potential for student success in first-semester calculus.

Fecal Microbial Composition of Ulcerative Colitis and Crohn’s Disease Patients in Remission and Subsequent Exacerbation
Edgar S. Wills, Daisy M. A. E. Jonkers, Paul H. Savelkoul, Ad A. Masclee, Marieke J. Pierik, John Penders
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090981
Abstract: Background Limited studies have examined the intestinal microbiota composition in relation to changes in disease course of IBD over time. We aimed to study prospectively the fecal microbiota in IBD patients developing an exacerbation during follow-up. Design Fecal samples from 10 Crohn’s disease (CD) and 9 ulcerative colitis (UC) patients during remission and subsequent exacerbation were included. Active disease was determined by colonoscopy and/or fecal calprotectine levels. Exclusion criteria were pregnancy, antibiotic use, enema use and/or medication changes between consecutive samples. The microbial composition was assessed by 16S rDNA pyrosequencing. Results After quality control, 6,194–11,030 sequences per sample were available for analysis. Patient-specific shifts in bacterial composition and diversity were observed during exacerbation compared to remission, but overarching shifts within UC or CD were not observed. Changes in the bacterial community composition between remission and exacerbation as assessed by Bray-Curtis dissimilarity, were significantly larger in CD versus UC patients (0.59 vs. 0.42, respectively; p = 0.025). Thiopurine use was found to be a significant cause of clustering as shown by Principal Coordinate Analysis and was associated with decreases in bacterial richness (Choa1 501.2 vs. 847.6 in non-users; p<0.001) and diversity (Shannon index: 5.13 vs. 6.78, respectively; p<0.01). Conclusion Shifts in microbial composition in IBD patients with changing disease activity over time seem to be patient-specific, and are more pronounced in CD than in UC patients. Furthermore, thiopurine use was found to be associated with the microbial composition and diversity, and should be considered when studying the intestinal microbiota in relation to disease course.
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