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排序方式: 共有905条查询结果,搜索用时 15 毫秒
901.
Dejuan Fa Jiangyan Yuan Guangyuan Feng Prof. Dr. Shengbin Lei Prof. Dr. Wenping Hu 《Angewandte Chemie (International ed. in English)》2023,62(18):e202300532
Bimetallic electrocatalysts with its superior performance has a broad application prospect in oxygen evolution reaction (OER), but the fundamental understanding of the mechanism of synergistic effect is still limited since there lacks a practical way to decouple the influence factors on the intrinsic activity of active sites from others. Herein, a series of bimetallic Co−Ni two-dimensional polymer (2DP) model OER catalysts with well-defined architecture, monolayer characteristic, were designed and synthesized to explore the influence of the coupling strength between metal centers on OER performance. The coupling strength was regulated by adjusting the spacing between metal centers or the conjugation degree of bridge skeleton. Among the examined 2DPs, CoTAPP-Ni-MF-2DP, which has the strongest coupling strength between metal centers exhibited the best OER performance. These model systems can help to explore the precise structure-performance relationships, which is important for the rational catalyst design at the atomic/molecular levels. 相似文献
902.
Dr. Zongkun Chen Xingkun Wang Dr. Zhongkang Han Dr. Siyuan Zhang Dr. Simone Pollastri Qiqi Fan Dr. Zhengyao Qu Debalaya Sarker Prof. Christina Scheu Prof. Minghua Huang Prof. Helmut Cölfen 《Angewandte Chemie (International ed. in English)》2023,62(10):e202215728
Layered double hydroxides (LDHs), whose formation is strongly related to OH− concentration, have attracted significant interest in various fields. However, the effect of the real-time change of OH− concentration on LDHs’ formation has not been fully explored due to the unsuitability of the existing synthesis methods for in situ characterization. Here, the deliberately designed combination of NH3 gas diffusion and in situ pH measurement provides a solution to the above problem. The obtained results revealed the formation mechanism and also guided us to synthesize a library of LDHs with the desired attributes in water at room temperature without using any additives. After evaluating their oxygen evolution reaction performance, we found that FeNi-LDH with a Fe/Ni ratio of 25/75 exhibits one of the best performances so far reported. 相似文献
903.
Zuozheng Xu Liqi Zhou Gang Zhou Shuyi Wu Peifang Wang Hao Li Peilin Huang Lizhe Liu 《Angewandte Chemie (International ed. in English)》2023,62(21):e202301128
This work suggests an intriguing light-driven atomic assembly proposal to orderly configure the distribution of reactive sites to optimize the spin-entropy-related orbital interaction and charge transfer from electrocatalysts to intermediates. Herein, the introduced fluorine (F) atoms acting as photo-corrosion centres in MnO1.9F0.1 effectively soften the bonding interaction of Mn−O bonds in the IrCl3 solution. Therefore, partial Mn atoms can be successively replaced to form orderly atomic-hybridized catalysts with a spin-related low entropy due to the coexistence of Ir-atomic chains and clusters. The time-related elemental analysis demonstrates that the dynamic dissolution/redeposition of Ir clusters in acidic oxygen evolution leads to a reintegration of the reaction pathway to seek the switchable rate-limiting step with a lower activation energy. 相似文献
904.
905.
Assoc. Prof. Yan Jiao Assoc. Prof. Yao Zheng 《Angewandte Chemie (International ed. in English)》2023,62(34):e202307303
In the past, the design of efficient electrocatalyst materials for alkaline hydrogen evolution reaction (HER) was mostly focused on tuning the adsorption properties of reaction intermediates. A recent breakthrough shows that the performance can be improved by manipulating water structure at the electrode-electrolyte interface using atomically localized electric fields. The new approach was realized by using IrRu dizygotic single-atom sites and led to a significantly accelerated water dissociation and an overall improved alkaline HER performance. Supported by extensive data from advanced modeling, characterization, and electrochemical measurements, the work delivers an intricate examination of the interaction between water molecules and the catalyst surface, thereby enriching our understanding of water dissociation kinetics and offering new insights to boost overall alkaline HER efficiency. 相似文献