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81.
Markus H. J. Seifert 《Journal of computer-aided molecular design》2009,23(9):633-644
Target-specific optimization of scoring functions for protein–ligand docking is an effective method for significantly improving
the discrimination of active and inactive molecules in virtual screening applications. Its applicability, however, is limited
due to the narrow focus on, e.g., single protein structures. Using an ensemble of protein kinase structures, the publically
available directory of useful decoys ligand dataset, and a novel multi-factorial optimization procedure, it is shown here
that scoring functions can be tuned to multiple targets of a target class simultaneously. This leads to an improved robustness
of the resulting scoring function parameters. Extensive validation experiments clearly demonstrate that (1) virtual screening
performance for kinases improves significantly; (2) variations in database content affect this kind of machine-learning strategy
to a lesser extent than binary QSAR models, and (3) the reweighting of interaction types is of particular importance for improved
screening performance.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
82.
Ragothaman Yennamalli Naidu Subbarao Thorsten Kampmann Ross P. McGeary Paul R. Young Bostjan Kobe 《Journal of computer-aided molecular design》2009,23(6):333-341
Dengue and related flaviviruses represent a significant global health threat. The envelope glycoprotein E mediates virus attachment
to a host cell and the subsequent fusion of viral and host cell membranes. The fusion process is driven by conformational
changes in the E protein and is an essential step in the virus life cycle. In this study, we analyzed the pre-fusion and post-fusion
structures of the dengue virus E protein to identify potential novel sites that could bind small molecules, which could interfere
with the conformational transitions that mediate the fusion process. We used an in silico virtual screening approach combining
three different docking algorithms (DOCK, GOLD and FlexX) to identify compounds that are likely to bind to these sites. Seven
structurally diverse molecules were selected to test experimentally for inhibition of dengue virus propagation. The best compound
showed an IC50 in the micromolar range against dengue virus type 2.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
83.
A linear elliptic control problem with pointwise state constraints is considered. These constraints are given in the domain.
In contrast to this, the control acts only at the boundary. We propose a general concept using virtual control in this paper.
The virtual control is introduced in objective, state equation, and constraints. Moreover, additional control constraints
for the virtual control are investigated. An error estimate for the regularization error is derived as main result of the
paper. The theory is illustrated by numerical tests. 相似文献
84.
改进的粒子群算法在虚拟企业合作伙伴选择中的应用 总被引:1,自引:0,他引:1
根据虚拟企业合作伙伴选择的原则,给出了合作伙伴选择的多目标决策模型,用定量的方法对合作伙伴进行描述.同时,给出了改进的二进制粒子群优化算法,并对本文的多目标优化问题进行求解.通过仿真试验测试,证明该方法是可行性. 相似文献
85.
Gastreich M Lilienthal M Briem H Claussen H 《Journal of computer-aided molecular design》2006,20(12):717-734
We report on a successful de novo design approach which relies on the combination of multi-million compound combinatorial docking under receptor-based pharmacophore constraints. Inspired by a rationale by A.R. Leach et al., we document on the unification of two steps into one for ligand assembly. In the original work, fragments known to bind in protein active sites were connected forming novel ligand compounds by means of generic skeleton linkers and following a combinatorial approach. In our approach, the knowledge of fragments binding to the protein has been expressed in terms of a receptor-based pharmacophore definition. The combinatorial linking step is performed in situ during docking, starting from combinatorial libraries. Three sample scenarios growing in size and complexity (combinatorial libraries of 1 million, 1.3 million, and 22.4 million compounds) have been created to illustrate the method. Docking could be accomplished between minutes and several hours depending on the outset; the results were throughout promising. Technically, a module compatibility between FlexX(C) and FlexX-Pharm has been established. The background is explained, and the crucial points from an information scientist's perspective are highlighted. 相似文献
86.
M. Di Paola R. Heuer A. Pirrotta 《International Journal of Solids and Structures》2013,50(22-23):3505-3510
Aim of this paper is the response evaluation of fractional visco-elastic Euler–Bernoulli beam under quasi-static and dynamic loads. Starting from the local fractional visco-elastic relationship between axial stress and axial strain, it is shown that bending moment, curvature, shear, and the gradient of curvature involve fractional operators. Solution of particular example problems are studied in detail providing a correct position of mechanical boundary conditions. Moreover, it is shown that, for homogeneous beam both correspondence principles also hold in the case of Euler–Bernoulli beam with fractional constitutive law. Virtual work principle is also derived and applied to some case studies. 相似文献
87.
88.
利用具有新机制的抗耐药菌DNA旋转酶抑制剂GSK299423与DNA旋转酶的晶体复合物(PDB code:2XCS)构建基于配体-受体复合物的药效团模型, 诱骗集(Decoy set)验证结果表明该药效团模型具有较强的活性识别能力. 将药效团模型与分子对接相结合用于筛选化合物库, 通过抑菌活性测定, 获得了具有抗多药耐药菌活性的DNA旋转酶抑制剂LTH02. 相似文献
89.
90.
建筑物通常留有开口以便人员物料的进出及室内的自然通风采光,但这些开口也是噪声传播的途径。传统被动噪声控制方法需要将开口封闭,且对低频噪声的控制效果不好,故引入有源噪声控制技术降低室内声源通过开口的声辐射。基于惠更斯原理,均布开口的次级源和误差传声器构成的平面型虚拟声屏障可以实现对开口声辐射的有效控制,数值仿真和实验已证明其有效性。将次级源安装在开口边界更有利于保留开口的功能且方便实际安装,但这样的单层边界虚拟声屏障降噪效果存在上限,仅能在低频段实现全局控制。和单层边界次级源相比,双层边界次级源可显著提高降噪量和有效降噪频率上限。该文回顾了开口声辐射有源控制的相关工作,并讨论了未来可能的研究方向。 相似文献