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101.
以甲醛和环氧氯丙烷为交联剂,用反相悬浮法制备得到壳聚糖/淀粉微球,并用扫描电镜对其进行表征,同时研究了微球对金属离子Cu^2+,Pb^2+的吸附性能.实验结果表明:用反相悬浮法,壳聚糖与淀粉的质量比在5:0至5:5间可制成形状规则、表面光滑的微球.加该微球吸附金属离子Cu^2+,Pb^2+,均可在6h内达到平衡.淀粉的加入能提高微球的产率,并可在保证吸附性能的前提下降低成本.当壳聚糖与淀粉其混的质量比为5:1时,共混微球的产率最高,达到相同吸附效果所需的原料用世最少,成本最低. 相似文献
102.
Perrine-Walker F Gherbi H Imanishi L Hocher V Ghodhbane-Gtari F Lavenus J Benabdoun FM Nambiar-Veeti M Svistoonoff S Laplaze L 《Current protein & peptide science》2011,12(2):156-164
Actinorhizal symbioses are mutualistic associations between plants belonging to eight angiosperm families and soil bacteria of the genus Frankia. These interactions lead to the formation of new root organs, actinorhizal nodules, where the bacteria are hosted and fix atmospheric nitrogen thus providing the plant with an almost unlimited source of nitrogen for its nutrition. It involves an elaborate signaling between both partners of the symbiosis. In recent years, our knowledge of this signaling pathway has increased tremendously thanks to a series of technical breakthroughs including the sequencing of three Frankia genomes [1] and the implementation of RNA silencing technology for two actinorhizal species. In this review, we describe all these recent advances, current researches on symbiotic signaling in actinorhizal symbioses and give some potential future research directions. 相似文献
103.
应用4变量精确平板理论分析FG复合板的自由振动 总被引:1,自引:0,他引:1
应用4变量的精确平板理论,对矩形功能梯度材料(FGM)复合板进行自由振动分析.与其它的理论不同,该理论的未知函数数量只有4个,而别的剪变形理论的未知函数为5个.提出的4变量精确平板理论,协调条件有了改变,与经典的薄板理论相比,许多方面有着惊人的相似,无需引入剪切修正因数——当横向剪应力越过板厚后,为了满足剪应力自由表面条件,出现抛物线状的改变,导致横向剪应力的变化.考虑了两种常见类型的FGM复合板,即,FGM表面层和各向同性夹芯层的复合板,以及各向同性表面层和FGM夹芯层的复合板.通过Hamilton原理,得到了FGM复合板的运动方程.得到闭式的Navier解,然后求解特征值问题,得到自由振动的基本频率.将该理论得到的结果,与经典理论,一阶的及其它更高阶的理论所得到的结果进行比较,检验了该理论的有效性.研究发现,该理论在求解FGM复合板自由振动性能方面,既精确又简单. 相似文献
104.
In this paper, we establish some coupled coincidence point results in the setting of partially ordered cone metric spaces via $c$ -distance. We also proved some related coupled common fixed point theorems for such mappings. Our results generalize, extend, and unify several well-known comparable results in the literature regarding this topic. We present some examples to illustrate the concepts and results. 相似文献
105.
ABDELALI DAOUDI MOHAMED FILALI BABA SOUAD ELKHATTABI FRANÇOIS ROGEMOND HENRY CHERMETTE 《Molecular physics》2013,111(19):2929-2951
The electronic structure of the ScN and ScP molecules is a subject of controversy and turns out to be a challenging problem in quantum chemistry. We show that the ground-state electronic structure for both molecules depends critically on the choice of methods used which incorporate different ways of accounting for electron correlation. A parallel ab initio, DFT and TD-DFT study is performed for this purpose and uses sufficiently flexible basis sets able to reproduce accurate electronic structures, as well as correct spectroscopic constants. In the ab initio methodology, results have been obtained with methods such as Hartree-Fock (HF), M?ller-Plesset perturbation theory (MPn), direct configuration interaction (CI), quadratic configuration interaction (QC), coupled cluster configuration interaction (CC), complete active space self-consistent field (CASSCF) and multireference configuration interaction (CIPSI) methods. In the DFT methodology, various ‘pure’ and ‘hybrid’ density functionals are used and the corresponding results are compared to sophisticated ab initio methods and to available experimental data. All the methods used show that the ground state of both molecules is 1Σ+, but two electronic structure natures, 1Σ+ open-shell or 1Σ+ closed-shell, are competitive and depend on the method employed. All the ab initio methods based on a single determinant wavefunction suffer seriously in predicting clearly the exact nature of the ground state or its correct structural and spectroscopic parameters. However, the ab initio methods based on a multiconfigurational wavefunction appear to be successful in describing correctly, within one shot, the electronic structure and the molecular spectroscopic constants. The ground state, particularly for the ScN molecule, presents an unusual electronic structure: the presence of degenerate determinants, quasidegeneracy with other states and one avoided crossing in the region around the equilibrium distances. The bonding of the ground state is a two open-shell 1Σ+ state described as a π double bond and a Σ dative bond; the real triple bond 1Σ+ state, i.e. closed-shell state, is found to lie higher in energy. The potential energy curves of the lowlying electronic states, the derived electronic structures and various molecular spectroscopic constants are presented and discussed for each method employed. 相似文献
106.
107.
Tausiff Mohammad Ouakad Hassen M. Alqahtani Hussain Alofi Abdurahman 《Nonlinear dynamics》2019,95(4):2907-2921
Nonlinear Dynamics - The nonlinear dynamic behavior of a resonant MEMS arch microbeam actuated by fringing electric actuation is investigated in this paper. The arch microbeam is loaded with DC and... 相似文献
108.
109.
To improve the proton conduction of crystalline porous organic salts(CPOS-1), H2SO4 and H3PO4 were introduced into the channel to obtain H2SO4@CPOS-1 and H3PO4@CPOS-1. Compared to CPOS-1, the proton conductivities of H2SO4@CPOS-1 and H3PO4@CPOS-1 increased two orders of magnitude and one order of magnitude at 303 K and 100% RH, respectively. It can be attributed to the increasing concentration of the protons, which dissociates from the acids. 相似文献
110.