首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   256篇
  免费   0篇
化学   179篇
晶体学   6篇
力学   5篇
数学   12篇
物理学   54篇
  2022年   2篇
  2021年   4篇
  2020年   6篇
  2019年   7篇
  2018年   3篇
  2016年   4篇
  2015年   3篇
  2014年   9篇
  2013年   12篇
  2012年   11篇
  2011年   13篇
  2010年   5篇
  2009年   1篇
  2008年   19篇
  2007年   9篇
  2006年   5篇
  2005年   10篇
  2004年   8篇
  2003年   10篇
  2002年   9篇
  2001年   6篇
  2000年   5篇
  1999年   3篇
  1998年   2篇
  1997年   8篇
  1996年   3篇
  1995年   1篇
  1994年   3篇
  1993年   3篇
  1992年   2篇
  1991年   6篇
  1990年   6篇
  1989年   2篇
  1988年   3篇
  1987年   3篇
  1986年   1篇
  1985年   1篇
  1984年   5篇
  1983年   2篇
  1982年   2篇
  1981年   1篇
  1980年   5篇
  1979年   9篇
  1978年   3篇
  1977年   5篇
  1976年   4篇
  1975年   2篇
  1974年   6篇
  1973年   1篇
  1968年   1篇
排序方式: 共有256条查询结果,搜索用时 0 毫秒
41.
A novel energy-transfer system involving nonaggregated cationic porphyrins adsorbed on an anionic-type clay surface and the electron-transfer reaction that occurs after light harvesting are described. In the clay-porphyrin complexes, photochemical energy transfer from excited singlet zinc porphyrins to free-base porphyrins proceeds. The photochemical electron-transfer reaction from an electron donor in solution (hydroquinone) to the adsorbed porphyrin in the excited singlet state was also examined. Because the electron-transfer rate from the hydroquinone to the excited singlet free-base porphyrin is larger than that to the excited singlet zinc porphyrin, we conclude that the energy transfer accelerates the overall electron-transfer reaction.  相似文献   
42.
    
2‐Deoxystreptamine (2DOS) is the unique chemically stable aminocyclitol scaffold of clinically important aminoglycoside antibiotics such as neomycin, kanamycin, and gentamicin, which are produced by Actinomycetes. The 2DOS core can be decorated with various deoxyaminosugars to make structurally diverse pseudo‐oligosaccharides. After the discovery of biosynthetic gene clusters for 2DOS‐containing aminoglycoside antibiotics, the function of each biosynthetic enzyme has been extensively elucidated. The common biosynthetic intermediates 2DOS, paromamine and ribostamycin are constructed by conserved enzymes encoded in the gene clusters. The biosynthetic intermediates are then converted to characteristic architectures by unique enzymes encoded in each biosynthetic gene cluster. In this Personal Account, we summarize both common biosynthetic pathways and the pathways used for structural diversification.

  相似文献   

43.
    
Cobalt‐based compounds, such as cobalt(II) hydroxide, are known to be good catalysts for water oxidation. Herein, we report that such cobalt species can also activate wide‐band‐gap semiconductors towards visible‐light water oxidation. Rutile TiO2 powder, a well‐known wide‐band‐gap semiconductor, was capable of harvesting visible light with wavelengths of up to 850 nm, and thus catalyzed water oxidation to produce molecular oxygen, when decorated with cobalt(II) hydroxide nanoclusters. To the best of our knowledge, this system constitutes the first example that a particulate photocatalytic material that is capable of water oxidation upon excitation by visible light can also operate at such long wavelengths, even when it is based on earth‐abundant elements only.  相似文献   
44.
    
We have developed two syntheses of vicenistatin and its analogues. Our first‐generation strategy included the rapid and sequential assembly of the macrocyclic lactam by using an intermolecular Horner–Wadsworth–Emmons reaction between the C3–C13 fragment and the C1–C2, C14–C19 fragment, followed by an intramolecular Stille coupling reaction. The second‐generation strategy utilized a ring‐closing metathesis of a hexaene intermediate to generate the desired 20‐membered macrolactam. This second‐generation strategy made it possible to prepare synthetic analogues of vicenistatin, including the C20‐ and/or C23‐demethyl analogues. Evaluation of the cytotoxic effect of these analogues indicated the importance of the fixed conformation of aglycon for determining the biological activity of the vicenistatins.  相似文献   
45.
46.
    
An azaanalog of adamantene, 2-azaadamant-1-ene (1) and 4-azaprotoadamant-3-ene (7) were generated in the nonstatistical ratio via photolysis of 3-azidonoradamantane (2). The highly strained 1 and 7 could not be isolable but were trapped by MeOH. Acidolysis of 2 was also reported, and discussed in comparison with the photolysis.  相似文献   
47.
48.
49.
Scanning-tunneling spectroscopy at 5 K was used to investigate the electrostatic potential profile on the Si(111)-square root of 3 x square root of 3 Ag surface at subnanometer spatial resolution. The potential was measured from an energy-level shift of electronic states on the surface. The potential images obtained reveal that the potential drops around the steps and Ag adsorbates, upon which positive charges are presumably accumulated. The profiles of the reduced potentials are explained with the screening of potential due to the charges by two-dimensional electron gas (2DEG) existing on the surface. The Friedel oscillation, which results from the screening and has a period of the half Fermi wavelength of the 2DEG, was also observed in the potential images.  相似文献   
50.
    
Both, N-shaped NDR (negative differential resistance) and S-shaped NDR in the ferromagnetic semiconductor CdCr2Se4 are studied. The peak field of N-shaped NDR decreases with the decrease in the environment temperature or with the increase in the applied magnetic field. The peak current density of S-shaped NDR decreases with the decrease in the environment temperature but is not affected by the magnetic field. The behaviour of both NDR's can be explained by the change of the conductivity due to the Joule heat generated in specimens.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号