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   262130篇
  免费   7834篇
  国内免费   5263篇
化学   143352篇
晶体学   3221篇
力学   12949篇
综合类   329篇
数学   29266篇
物理学   86110篇
  2021年   2704篇
  2020年   3378篇
  2019年   3584篇
  2018年   3978篇
  2017年   3930篇
  2016年   5733篇
  2015年   4225篇
  2014年   5873篇
  2013年   12490篇
  2012年   11184篇
  2011年   13146篇
  2010年   9037篇
  2009年   9203篇
  2008年   11633篇
  2007年   11336篇
  2006年   10684篇
  2005年   9778篇
  2004年   8706篇
  2003年   7526篇
  2002年   7097篇
  2001年   8179篇
  2000年   6133篇
  1999年   4642篇
  1998年   3778篇
  1997年   3642篇
  1996年   3523篇
  1995年   3248篇
  1994年   3234篇
  1993年   3032篇
  1992年   3322篇
  1991年   3349篇
  1990年   3065篇
  1989年   2947篇
  1988年   2884篇
  1987年   2809篇
  1986年   2685篇
  1985年   3652篇
  1984年   3618篇
  1983年   2979篇
  1982年   3142篇
  1981年   2931篇
  1980年   2861篇
  1979年   2943篇
  1978年   3031篇
  1977年   2983篇
  1976年   3032篇
  1975年   2910篇
  1974年   2850篇
  1973年   2935篇
  1972年   1934篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
1.
Crystallography Reports - The review presents the important unique results of the cycle of research led by M.V. Kovalchuk on the fundamental patterns of protein interactions and the protein...  相似文献   
2.
Journal of Applied Mechanics and Technical Physics - A method for determining the empirical dependence of the rheological properties of rocks on stresses has been developed and tested in...  相似文献   
3.
Journal of Analytical Chemistry - A review of works in developing optical multisensor systems, a new class of specialized spectroscopic analyzers, is presented. The development and use of such...  相似文献   
4.
Bo  Luo  Gao  Wei  Yu  Yuguo  Chen  Xiaojun 《Nonlinear dynamics》2022,110(1):281-311
Nonlinear Dynamics - The perovskite solar cell (PSC) is one of the most promising photovoltaic candidates along with the highly increasing demand for green electricity. One of the main concerns...  相似文献   
5.
Acta Mathematica Sinica, English Series - We are interested in the existence and asymptotic behavior for the least energy solutions of the following fractional eigenvalue problem $$\left({\rm{P}}...  相似文献   
6.
7.
8.
Russian Physics Journal - The physical and chemical processes occurring in non-metallic inorganic porous coatings during the passage of a high-voltage alternating sinusoidal current through the...  相似文献   
9.
Russian Journal of Applied Chemistry - A method for the disposal of hydrolysis lignin waste based on its modification with ZnCl2 and FeCl3 and subsequent carbonization at 800°C was proposed....  相似文献   
10.
Atopic dermatitis is characterized by leukocyte migration into the skin dermis and typically driven by excessive chemokine production at the site of inflammation. Conventional topical formulations such as gels, creams, and ointments are insufficient for this treatment because of low penetration of drug molecules into the targeted skin tissues. Herein, using a simple, green, sustainable strategy, we have developed novel primary zein nanoparticles embedded in curcumin (Cur) and coated with silk sericin (ZHSCs) for the topical delivery of Cur to penetrate into the dermis and exercise anti-dermatitis effects on the lesion with minimal side-effects. Transdermal delivery experiments and porcine skin fluorescence imaging indicated that ZHSCs facilitate the penetration of Cur across the epidermis layer of skin to reach deep-seated sites. Notably, ZHSCs = 1:0.25 (zein-to-silk sericin mass ratios of 1:0.25) markedly elevated the skin permeability and cumulative turnover of Cur transferred, which were provided a greater than a 3.8-fold increase relative to free Cur. The special nanoparticles of ZHS = 1:0.25 possessed the deepest localization depth and experience a transition of the particle structure and core-shell separation after penetrating into the dermis of skin. In a cell model of dermatitis induced by tumor necrosis factor α/interferon γ co-stimulation, compared with free Cur, Cur-loaded ZHS nanoparticles down-regulated the generation of inflammatory cytokines and chemokines in keratinocytes through suppression of the nuclear translocation of NF-κBp65 and hence exerted an anti-dermatitis effect. This strategy may provide new avenues and direction for the demanding issues of valid topical delivery systems.  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