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21.
Moiré principles and procedures were surveyed with a view toward adaptation to measurement of complex strain distribution in solid propellants. Compliant coating and photosensitive materials were selected for grid reproduction. The most flexible of the several possible procedures for recording moiré data was found to be grid photography. A novel “grid-shift” technique employing coarse grids was developed for point-by-point determination of surface displacement derivatives, and the grid-shift relations for large strain and large rotation were derived. The technique is extremely versatile, permitting the analysis of strain of dynamically deformed specimens in nonambient environmental conditions of temperature, pressure or atmosphere. The utility of the technique was demonstrated by application to static and dynamic problems. 相似文献
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Scott E. Sampson Elliott N. Weiss 《The Journal of the Operational Research Society》1996,47(2):297-314
We look at a conference scheduling problem with the objective of maximizing the ability of participants to attend sessions of interest. This problem was addressed in an article by Eglese and Rand; conference scheduling has otherwise received little attention in management science literature. Related problems of class- and exam-scheduling have been extensively studied and published, yet few cases consider participant (e.g. student) preferences. Our formulation, which a variation of that used by Eglese and Rand, includes prioritized preferences for conference sessions, as well as schedule resource constraints. The purpose of this paper is to extend the previous work by exploring the impact of various scheduling decisions on participant satisfaction (measured by enrollment in desired sessions). We use a previously published algorithm to look at issues such as conference length and make general observations that may aid the conference-scheduling decision maker. 相似文献
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A framework for positive dependence 总被引:4,自引:3,他引:1
George Kimeldorf Allan R. Sampson 《Annals of the Institute of Statistical Mathematics》1989,41(1):31-45
This paper presents, for bivariate distributions, a unified framework for studying and relating three basic concepts of positive dependence. These three concepts are positive dependence orderings, positive dependence properties and measures of positive dependence. The latter two concepts are formally defined and their properties discussed. Interrelationships among these three concepts are given, and numerous examples are presented.Supported by the National Science Foundation under Grant DMS-8301361.Supported by the Air Force Office of Scientific Research under Contract 84-0113. Reproduction in whole or part is permitted for any purpose of the United States Government. 相似文献
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Allan R Sampson 《Journal of multivariate analysis》1983,13(2):375-381
Let X1, …, Xp have p.d.f. g(x12 + … + xp2). It is shown that (a) X1, …, Xp are positively lower orthant dependent or positively upper orthant dependent if, and only if, X1,…, Xp are i.i.d. N(0, σ2); and (b) the p.d.f. of |X1|,…, |Xp| is TP2 in pairs if, and only if, In g(u) is convex. Let X1, X2 have p.d.f. . Necessary and sufficient conditions are given for f(x1, x2) to be TP2 for fixed correlation ?. It is shown that if f is TP2 for all ? >0. then (X1, X2)′ ~ N(0, Σ). Related positive dependence results and applications are also considered. 相似文献
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Yang Zhou Ruth B. Cink Dr. Rohan S. Dassanayake Prof. Alexander J. Seed Prof. Nicola E. Brasch Prof. Paul Sampson 《Angewandte Chemie (International ed. in English)》2016,55(42):13229-13232
Directly obtaining kinetic and mechanistic data for the reactions of nitroxyl (HNO) with biomolecules (k≈103–107 m ?1 s?1) is not feasible for many systems because of slow HNO release from HNO donor molecules (t1/2 is typically minutes to hours). To address this limitation, we have developed a photoactivatable HNO donor incorporating the (3‐hydroxy‐2‐naphthalenyl)methyl phototrigger, which rapidly releases HNO on demand. A “proof of concept” study is reported, which demonstrates that, upon continuous xenon light excitation, rapid decomposition of the HNO donor occurs within seconds. The amount of HNO generated is strongly dependent on solvent and the rate of the reaction is dependent on the light intensity. 相似文献