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161.
Tonghui Zhao Mengting Li Dongdong Xiao Xiaoju Yang Lulu An Zhiping Deng Tao Shen Mingxing Gong Yi Chen Hongfang Liu Ligang Feng Xuan Yang Li Li Deli Wang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2024,136(5):e202315148
Tracking the trajectory of hydrogen intermediates during hydrogen electro-catalysis is beneficial for designing synergetic multi-component catalysts with division of chemical labor. Herein, we demonstrate a novel dynamic lattice hydrogen (LH) migration mechanism that leads to two orders of magnitude increase in the alkaline hydrogen oxidation reaction (HOR) activity on Pd@Pt over pure Pd, even ≈31.8 times mass activity enhancement than commercial Pt. Specifically, the polarization-driven electrochemical hydrogenation process from Pd@Pt to PdHx@Pt by incorporating LH allows more surface vacancy Pt sites to increase the surface H coverage. The inverse dehydrogenation process makes PdHx as an H reservoir, providing LH migrates to the surface of Pt and participates in the HOR. Meanwhile, the formation of PdHx induces electronic effect, lowering the energy barrier of rate-determining Volmer step, thus resulting in the HOR kinetics on Pd@Pt being proportional to the LH concentration in the in situ formed PdHx@Pt. Moreover, this dynamic catalysis mechanism would open up the catalysts scope for hydrogen electro-catalysis. 相似文献
162.
Ran Ming Gao Tao Zhu Zhenghe Jiang Gang Jiang Guoqiang Luo Deli Wu Sheng 《化学物理学报(中文版)》2000,13(2):156-160
The present work has derived the potential energy function for the ground state X1∑+of LaH in Murrell-Sorbie function form. In the first place, the electronic state and it′ s rea sonable dissodation limits are correctly determined based on Atomic and Molecular Reaction Statics (AMRS), and then, using the relativistic compact effective potential (RCEP) for La, the equilibrium geometry and dissociation energy for LaH have been calculated by the QCISD method. The calculated results for Re'De' Be' αe' ωe and ωexe are 2.125A, 2.623eV,3.7333cm-1, 0.0723 cm-1, 1461.73cm-1 and 21.383cm-1 respectively, which are in good agreement with experimental or calculated values in references. 相似文献
163.
LIU Deli QI Dongping CHENG Chuanfu 《Chinese Journal of Lasers》2000,9(3):213-218
1 Introduction Someusecontacttechniques(suchasprofilometry,scanningprobemicroscopy)andtheothersusenoncontacttechniques,mostofwhichareactuallyopticalmethods,andlightscattering[1,2],ellipseometry[3]andsurfaceplasmonspectroscopy[4]aretheexamples.Uptonow,thedeter… 相似文献
164.
165.
金属镍吸附氢同位素的量子力学计算 总被引:18,自引:8,他引:10
根据原子分子反应静力学与群论,确定了NiH、NiD和NiT的基电子状态为2Σ+。应用基函数6-311G和组态相关CI或QCISD方法,计算了氢同位素分子及其镍化物的能量E、定容热容Cv和熵S。设用总能量中的电子和振动能量近似代表NiH、NiD和NiT分子处于固态时的能量,用总熵中的电子和振动熵近似代表这些分子处于固态时的熵,进而计算了镍吸附H2、D2和T2分子过程的ΔH°、ΔS°、ΔG°和平衡压力,并导出它们与温度的函数关系。计算指出了同位素分子效应,结果合理。所以,本文所建议的用量子力学方法计算多相化学反应,有应用参考价值。 相似文献
166.
Deli Li Andrew Rosalsky Dhaifalla K. Al-Mutairi 《Proceedings of the American Mathematical Society》2002,130(7):2133-2138
A large deviation principle for bootstrapped sample means is established. It relies on the Bolthausen large deviation principle for sums of i.i.d. Banach space valued random variables. The rate function of the large deviation principle for bootstrapped sample means is the same as the classical one.
167.
Summary The kinetics of oxygen-transfer from [MoO2(Et-L-cys)2] to PPh3 and the reaction between [Mo2O3(Et-L-cys)4] and O2 in benzene solution have been investigated using spectrophotometric techniques between 25 and 40°. The rate laws-d[Mo6+]/dt = k1[Mo6+][PPh3] with k1 (at 35°) = 2.95×10–4dm3mol–1s–1 and -d[Mo5+]/dt = 2k3[Mo5+][O2] with k3 (at 35°) = 6.3×10–2 dm3mol–1s–1 account for the kinetic data obtained with activation parameters (at 35°) of H = 46 kJ mol–1, S = –153 JK–1mol–1, and H = 50.8 kJ mol–1, S = –95 JK–1 mol–1 respectively. 相似文献
168.
利用具有非线性光学活性的对硝基苯胺掺杂高玻璃化转变温度的聚芳醚砜(PES-C)和聚芳醚酮(PEK-C),得到了两种掺杂含量较高的掺杂型非线性光学聚合物体系。电晕极化表明较高的取向和较慢的松驰。 相似文献
169.
二阶非线性光学极化聚合物 总被引:3,自引:2,他引:3
本文综述了二阶非线性光学极化聚合物材料研究概况,包括器件对材料的要求、材料的研究进展及目前存在的问题。 相似文献
170.
Pter Molnr Jzsef Deli Erzsbet sz Zoltn Matus Gyula Tth Ferenc Zsila 《Helvetica chimica acta》2004,87(8):2169-2179
3′‐Epilutein (=(all‐E,3R,3′S,6′R)‐4′,5′‐didehydro‐5′,6′‐dihydro‐β,β‐carotene‐3,3′‐diol; 1 ), isolated from the flowers of Caltha palustris, was submitted to both thermal isomerization and I2‐catalyzed photoisomerization. The structures of the main products (9Z)‐ 1 , (9′Z)‐ 1 , (13Z)‐ 1 , (13′Z)‐ 1 , (15Z)‐ 1 , and (9Z,9′Z)‐ 1 were determined based on UV/VIS, CD, 1H‐NMR, and MS data. 相似文献