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排序方式: 共有307条查询结果,搜索用时 468 毫秒
301.
Yoshinobu Naoshima Charles E. Carraher Jr. Timothy J. Gehrke Masahide Kurokawa David Blair 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(7):861-873
Abstract Dextran was modified through condensation with biscyclopentadienyltitanium dichloride and dibutyltin dichloride by employing a number of solution and interfacial condensation systems. The modified dextran is rapidly synthesized (within 30 s) in good yield with moderate to high degrees of substitution. The products are complex with chains composed of a variety of substituted and un-substituted glycopyranose units. 相似文献
302.
Masahide Ohno 《Journal of Electron Spectroscopy and Related Phenomena》2008,162(3):134-145
The relative spectral intensity of the band-like two M4,5-hole state to the atomic-like localized one is much suppressed in the coincidence M3–M4,5M4,5 super Coster–Kronig (sCK) electron spectrum of Cu metal compared to the one in the coincidence L3–M4,5M4,5 Auger electron spectroscopy (AES) spectrum. The M3-hole lifetime width of Cu metal is calculated by an ab initio atomic many-body theory (the extended relaxed core random phase approximation with exchange). The calculated M3-hole lifetime width of Cu metal agrees well with the experimental one. The M3–M4,5M4,5 sCK decay width of Cu metal decreases much with delocalization of the two M4,5 holes in the sCK final state, whereas the Auger decay width is fairly independent of localization and delocalization of the two M4,5 holes in the Auger final state. Thus, the relative spectral intensity of the band-like state is much suppressed in the coincidence M3–M4,5M4,5 sCK-electron spectrum of Cu metal compared to the one in the coincidence L3–M4,5M4,5 AES spectrum. 相似文献
303.
Hao K. Shen Kiyoshi Morishita Dr. P. K. Hashim Prof. Dr. Kou Okuro Daiki Kashiwagi Ayumi Kimura Dr. Haruaki Yanagisawa Prof. Dr. Masahide Kikkawa Prof. Dr. Tatsuya Niwa Prof. Dr. Hideki Taguchi Prof. Dr. Takuzo Aida 《Angewandte Chemie (International ed. in English)》2023,62(31):e202304894
Herein, we report an ATP-responsive nanoparticle (GroELNP) whose surface is fully covered with the biomolecular machine “chaperonin protein GroEL”. GroELNP was synthesized by DNA hybridization between a gold NP with DNA strands on its surface and GroEL carrying complementary DNA strands at its apical domains. The unique structure of GroELNP was visualized by transmission electron microscopy including under cryogenic conditions. The immobilized GroEL units retain their machine-like function and enable GroELNP to capture denatured green fluorescent protein and release it in response to ATP. Interestingly, the ATPase activity of GroELNP per GroEL was 4.8 and 4.0 times greater than those of precursor cysGroEL and its DNA-functionalized analogue, respectively. Finally, we confirmed that GroELNP could be iteratively extended to double-layered NP. 相似文献
304.
To check the possibility of living polymerization with a biscyclopentadienyl metallocene, propylene polymerization was conducted by Cp2ZrMe2 at –78°C or Cp2HfMe2 at –50°C using B(C6F5)3 and AlOct3 as a cocatalyst. The polymer yield increased linearly with polymerization time. The polypropylene obtained showed narrow molecular weight distribution (Mw/Mn 1.04–1.15). In addition, the number-average molecular weight increased in proportion to the polymerization time. It was, thus, found that living polymerization of propylene proceeds with the catalyst systems at a very low temperature. Isospecific living polymerization of 1-hexene also proceeded with the rac-(et)Ind2ZrMe2 catalyst at –78°C. 相似文献
305.
Hirosuke Watanabe Masashi Furukawa Tadahiko Takata Masahide Yamamoto 《Macromolecular Symposia》2000,159(1):131-142
The application of the low‐temperature plasma method, the excimer laser treatment method and the corona‐discharge method to aramid) were discussed, presenting an overview of current trends and developments in this area. 相似文献
306.
The structures of eleven different metallocenes substituted with either methyl and/or t-butyl groups were minimized by computer molecular modeling. Using Comparative Molecular Field Analysis (CoMFA), a computer model was generated from the minimized metallocene structures and actual polymerization performance. When the model was tested, a statistically valid correlation of the model's predicted DSC melting point with the observed DSC melting point was found. The model indicates the extent of the steric effect of these alkyl substituents and their influence on the DSC melting point. 相似文献
307.