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In this stochastic approach to global optimization, clustering techniques are applied to identify local minima of a real valued
objective function that are potentially global. Three different methods of this type are described; their accuracy and efficiency
are analyzed in detail. 相似文献
34.
Anne Bakker Matthias Freitag Elena Kolodzeiski Peter Bellotti Alexander Timmer Jindong Ren Bertram Schulze Lammers Daniel Moock Herbert W. Roesky Harry Mnig Saeed Amirjalayer Harald Fuchs Frank Glorius 《Angewandte Chemie (International ed. in English)》2020,59(32):13643-13646
The structural properties and binding motif of a strongly σ‐electron‐donating N‐heterocyclic carbene have been investigated on different transition‐metal surfaces. The examined cyclic (alkyl)(amino)carbene (CAAC) was found to be mobile on surfaces, and molecular islands with short‐range order could be found at high coverage. A combination of scanning tunneling microscopy (STM), X‐ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations highlights how CAACs bind to the surface, which is of tremendous importance to gain an understanding of heterogeneous catalysts bearing CAACs as ligands. 相似文献
35.
A.M. Manito Pereira M.C. Lopes J.M.K. Timmer J.T.F. Keurentjes 《Journal of membrane science》2005,260(1-2):174-180
Long-term stability and performance of polymeric membranes in solvent and mixed solvent media can be reduced due to sorption and swelling of the membrane matrix. For this reason quantification of sorption and swelling is of major importance for the development of future applications of membrane processes in solvent and mixed solvent media. In this work a method is discussed, based on attenuated total reflectance infrared spectroscopy (ATR-IR), to establish sorption and sorption selectivity of a cellulose acetate (CA) membrane in water/methanol and water/ethanol mixtures. By analysis of specific peaks from the ATR-IR spectra of the solvents, the preferential sorption of water in CA membranes can be quantified. In the presence of methanol, the selectivity for water ranges from 2.5 to 3.5 between 52 and 90% of methanol. For ethanol, the selectivity for water ranges from about 1 (30% ethanol) to 2 (90% ethanol). From the work it follows that ATR-IR provides an easy and non-destructive method to study the sorption behavior of the polymeric membrane separation layer. 相似文献
36.
Joseph Timmer 《代数通讯》2017,45(10):4444-4465
37.
Mattie S.M. Timmer Emma M. Dangerfield Janice M.H. Cheng Shivali A. GulabBridget L. Stocker 《Tetrahedron letters》2011,52(37):4803-4805
A remarkably efficient synthesis of the biologically important iminosugar 1-deoxygalactonojirimycin (DGJ) is presented. Key to this strategy is the development of a novel carbamate annulation reaction that favours formation of a six-membered carbamate-containing piperidine skeleton over its five-membered counterpart. 相似文献
38.
Cooperation and game-theoretic cost allocation in stochastic inventory models with continuous review
We study cooperation strategies for companies that continuously review their inventories and face Poisson demand. Our main goal is to analyze stable cost allocations of the joint costs. These are such that any group of companies has lower costs than the individual companies. If such allocations exist they provide an incentive for the companies to cooperate. 相似文献
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C. G. E. Boender A. H. G. Rinnooy Kan G. T. Timmer L. Stougie 《Mathematical Programming》1982,22(1):125-140
A stochastic method for global optimization is described and evaluated. The method involves a combination of sampling, clustering and local search, and terminates with a range of confidence intervals on the value of the global optimum. Computational results on standard test functions are included as well. 相似文献