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Anomalous energy loss distributions of l48Gd alpha particles have been observed in heavily implanted thin aluminium films. It is surmised that thin film micro-wrinkling is responsible for the observed effect and that the novel technique of energy loss spectral analysis (ELSA) should be useful in studies of the topography of such films. 相似文献
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MODERN CRYSTALLOGRAPHY I, by B. K. Vainshtein, Springer Series in Solid State Sciences 15. Springer-Verlag, New York, 1981. 399 pp., USf47.50. SPECTROSCOPY IN CHEMISTRY AND PHYSICS: Modern Trends, Edited by F. J. Comes, A. Muller and W. J. Orville-Thomas (Elsevier Scientific Publishing Company). Price US $87.75, Dfl 180.00. ELECTRONIC STATES OF MOLECULES AND ATOM CLUSTERS-Foundations and Prospects of Semiempirical Methods, by G. Del Re, G. Berthier and J. Serre. Springer Lecture Notes in Chemistry, Vol. 13. Price: US817.50 (Springer-Verlag, Berlin, 1980). MATERIALS FOR THE FUTURE, Edited by P. M. Kelly, Australian Academy of Science, 1981. 相似文献
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Christopher Barfoot David T. Davies Ilaria Giordano Graham Jones Michael McGuire Neil Pearson Ravinder Sudini Jeffery Wood 《Tetrahedron letters》2010,51(21):2846-7488
This Letter describes the synthetic challenges in synthesising key 1,4-cis-substituted cyclohexylamide intermediate 1 for our research programme. Five different routes address the major issues of selectivity to afford the cis product in isomerically pure form and in high yield. Major purification issues were also encountered upon scaling some of the routes. The merits of the diverse routes are assessed and the reasoning given for which one was ultimately used for large-scale synthesis of 1. 相似文献
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Elisabeth CW van Straaten Willem de Haan Hanneke de Waal Philip Scheltens Wiesje M van der Flier Frederik Barkhof Ted Koene Cornelis J Stam 《BMC neuroscience》2012,13(1):1-7
Background
This study examined the effects of dietary polyunsaturated fatty acids (PUFA) as different n-6: n-3 ratios on spatial learning and gene expression of peroxisome- proliferator-activated receptors (PPARs) in the hippocampus of rats. Thirty male Sprague?CDawley rats were randomly allotted into 3 groups of ten animals each and received experimental diets with different n-6: n-3 PUFA ratios of either 65:1, 22:1 or 4.5:1. After 10?weeks, the spatial memory of the animals was assessed using the Morris Water Maze test. The expression of PPAR?? and PPAR?? genes were determined using real-time PCR.Results
Decreasing dietary n-6: n-3 PUFA ratios improved the cognitive performance of animals in the Morris water maze test along with the upregulation of PPAR?? and PPAR?? gene expression. The animals with the lowest dietary n-6: n-3 PUFA ratio presented the highest spatial learning improvement and PPAR gene expression.Conclusion
It can be concluded that modulation of n-6: n-3 PUFA ratios in the diet may lead to increased hippocampal PPAR gene expression and consequently improved spatial learning and memory in rats. 相似文献9.
The generic two-loop diagram of massless scalar field theory ind dimensions, with propagators raised to powers {α i |i=1,5} is shown to have a symmetry groupZ 2×S 6 corresponding to reflection and permutation of six linear combinations of the six parameters. The expansion about α i =d/4=1 is given to the level required for six-loop renormalization. All but five of the coefficients are obtained from products of one-loop diagrams. All but one are expressed in terms of the Riemann zeta function. 相似文献
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Bobeldijk I Bouwhuis M Ireland DG de Jager CW Jans E de Jonge N Kasdorp WJ Konijn J Lapikás L van Leeuwe JJ van der Meer RL Nooren GJ Passchier E Schroevers M van der Steenhoven G Steijger JJ Theunissen JA van Uden MA de Vries H de Vries R de Witt Huberts PK Blok HP van den Brink HB Dodge GE Harakeh MN Hesselink WH Kalantar-Nayestanaki N Pellegrino A Spaltro CM Templon JA Hicks RS Kelly JJ Marchand C 《Physical review letters》1994,73(20):2684-2687