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Sadiq M. Sait Mustafa Imran Ali Ali Mustafa Zaidi 《Journal of Mathematical Modelling and Algorithms》2007,6(3):433-454
Simulated Evolution (SimE) is an evolutionary metaheuristic that has produced results comparable to well established stochastic
heuristics such as SA, TS and GA, with shorter runtimes. However, for optimization problems with a very large set of elements,
such as in VLSI cell placement and routing, runtimes can still be very large and parallelization is an attractive option for
reducing runtimes. Compared to other metaheuristics, parallelization of SimE has not been extensively explored. This paper
presents a comprehensive set of parallelization approaches for SimE when applied to multiobjective VLSI cell placement problem.
Each of these approaches are evaluated with respect to SimE characteristics and the constraints imposed by the problem instance.
Conclusions drawn can be extended to parallelization of SimE when applied to other optimization problems.
相似文献
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Takeshi Yamanobe Isao Ando Hazime Saitô Ryoko Tabeta Akira Shoji Takuo Ozaki 《Chemical physics》1985,99(2):259-264
An attempt was made to calculate 13C NMR chemical shifts of poly(β-benzyl L-aspartate) having the right-handed α-helix (αR-helix) and left-handed α-helix (αL-helix) forms by a tight-binding MO sum-over-states theory within the extended Hückel framework, in order to examine whether or not the conformation-dependent 13C chemical shifts previously determined by the cross polarization-magic angle spinning technique are reproduced by a change of electronic structure of the polymer. It is found that the relative displacements of the observed Cα, Cβ and carbonyl 13C chemical shifts between the αR- and αL-helices are reproduced qualitatively by the calculation. 相似文献
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T. Saitô 《Acta Mathematica Hungarica》1969,20(1-2):105-110
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A non-integrable system has an irregular spectrum for stationary bound energy levels. It is shown that the irregular sequence of level spacings gives an unambiguous representation of chaos in quantum systems. 相似文献
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Sait Sadiq M. Ahmed Syed Faraz Rafiq Muhammad Rahil 《Journal of Thermal Analysis and Calorimetry》2021,143(3):1935-1942
Journal of Thermal Analysis and Calorimetry - The purpose of this study is to measure and document the maximum level of broadband radiofrequency electromagnetic radiations in the vicinity of... 相似文献
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Seong-Wook Kim Hyeonjung Jung Dr. Mahmut Sait Okyay Dr. Hyuk-Jun Noh Sein Chung Young Hyun Kim Jong-Pil Jeon Prof. Dr. Bryan M. Wong Prof. Dr. Kilwon Cho Dr. Jeong-Min Seo Prof. Dr. Jung-Woo Yoo Prof. Dr. Jong-Beom Baek 《Angewandte Chemie (International ed. in English)》2023,62(42):e202310560
The development of covalent organic frameworks (COFs) with efficient charge transport is of immense interest for applications in optoelectronic devices. To enhance COF charge transport properties, electroactive building blocks and dopants can be used to induce extended conduction channels. However, understanding their intricate interplay remains challenging. We designed and synthesized a tailor-made COF structure with electroactive hexaazatriphenylene (HAT) core units and planar dioxin (D) linkages, denoted as HD-COF. With the support of theoretical calculations, we found that the HAT units in the HD-COF induce strong, eclipsed π–π stacking. The unique stacking of HAT units and the weak in-plane conjugation of dioxin linkages leads to efficient anisotropic charge transport. We fabricated HD-COF films to minimize the grain boundary effect of bulk COFs, which resulted in enhanced conductivity. As a result, the HD-COF films showed an electrical conductivity as high as 1.25 S cm−1 after doping with tris(4-bromophenyl)ammoniumyl hexachloroantimonate. 相似文献
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