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排序方式: 共有89条查询结果,搜索用时 31 毫秒
21.
Meredith Tromble 《Foundations of Chemistry》2009,11(1):51-60
This paper explores the use of chemical symbolism in works by the new media artist Sonya Rapoport, with a focus on the pivotal
Cobalt series from the late 1970s. These works, drawings on computer printouts generated by research at the Lawrence Berkeley Laboratory,
respond to experiments in nuclear chemistry. They mark the beginning of three productive decades in which Rapoport produced
a variety of images related to chemistry in her work. She states, “I looked for authentic research projects that were interesting
to me, preferably with captivating pictorial subject matter. Then came the creative chaotic process of resolving a cohesive
product that combined scientific research with art concept.” Rapoport had an unusual degree of access to scientific materials
through her husband, organic chemist Henry Rapoport, a faculty member at the University of California, Berkeley. At the time
of production, these works were outside mainstream art world interests and they have received little critical attention. This
paper examines the development of Rapoport’s images and places her use of chemical references in context in her lifetime of
work.
相似文献
Meredith TrombleEmail: |
22.
Global Interval Methods for Local Nonsmooth Optimization 总被引:4,自引:0,他引:4
An interval method for determining local solutions of nonsmooth unconstrained optimization problems is discussed. The objective function is assumed to be locally Lipschitz and to have appropriate interval inclusions. The method consists of two parts, a local search and a global continuation and termination. The local search consists of a globally convergent descent algorithm showing similarities to -bundle methods. While -bundle methods use polytopes as inner approximations of the -subdifferentials, which are the main tools of almost all bundle concepts, our method uses axes parallel boxes as outer approximations of the -subdifferentials. The boxes are determined almost automatically with inclusion techniques of interval arithmetic. The dimension of the boxes is equal to the dimension of the problem and remains constant during the whole computation. The application of boxes does not suffer from the necessity to invest methodical and computational efforts to adapt the polytopes to the latest state of the computation as well as to simplify them when the number of vertices becomes too large, as is the case with the polytopes. The second part of the method applies interval techniques of global optimization to the approximative local solution obtained from the search of the first part in order to determine guaranteed error bounds or to improve the solution if necessary. We present prototype algorithms for both parts of the method as well as a complete convergence theory for them and demonstrate how outer approximations can be obtained. 相似文献
23.
An axiomatic characterization of the Hirsch-index 总被引:2,自引:0,他引:2
The Hirsch-index is a well-known index for measuring and comparing the output of scientific researchers. The main contribution of this article is an axiomatic characterization of the Hirsch-index in terms of three natural axioms. Furthermore, two other scientific impact indices (called the w-index and the maximum-index) are defined and characterized in terms of similar axioms. 相似文献
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25.
Matthias P. Kläy 《Foundations of Physics Letters》1988,1(4):305-319
In part I, we have described the Einstein-Podolsky-Rosen experiments in the framework of an axiomatic probability theory. In part II, we present the proofs of the results stated in part I. 相似文献
26.
Jeffery L. Tallon 《Physics letters. A》1980,76(2):139-142
It is shown that the volume independent component, R 1n 2, of the entropy of melting, ΔSm, for argon persists, unchanged, some distance into the fluid phase as a configurational entropy. For argon, sodium, and caesium in its normal melting regime ΔSm = Rln 2 + αBTδVm, where ΔVm is the volume change on melting and αBT is the temperature independent product of the thermal expansion coefficient and the isothermal bulk modulus. 相似文献
27.
Alan F. Chalmers 《Foundations of Chemistry》2008,10(3):157-166
This paper suggests that the cases made for atoms and the aether in nineteenth-century physical science were analogous, with
the implication that the case for the atom was less than compelling, since there is no aether. It is argued that atoms did
not play a productive role in nineteenth-century chemistry any more than the aether did in physics. Atoms and molecules did
eventually find an indispensable home in chemistry but by the time that they did so they were different kinds of entities
to those figuring in the speculations of those natural philosophers who were atomists. Advances in nineteenth-century chemistry
were a precondition for rather than the result of the productive introduction of atoms into chemistry.
相似文献
Alan F. ChalmersEmail: |
28.
对物理化学教学改革提出以下4条建议:(1)教学内容要适应科学发展;(2)内容构架要以解决科学问题为主线;(3)教学要注重沟通知识模块间的科学联系;(4)明确指出各知识模块的科学应用。 相似文献
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