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   12508篇
  免费   1115篇
  国内免费   702篇
化学   8436篇
晶体学   121篇
力学   499篇
综合类   51篇
数学   1484篇
物理学   3734篇
  2023年   159篇
  2022年   293篇
  2021年   280篇
  2020年   308篇
  2019年   326篇
  2018年   253篇
  2017年   264篇
  2016年   404篇
  2015年   415篇
  2014年   485篇
  2013年   722篇
  2012年   899篇
  2011年   1025篇
  2010年   651篇
  2009年   676篇
  2008年   769篇
  2007年   734篇
  2006年   647篇
  2005年   561篇
  2004年   532篇
  2003年   455篇
  2002年   404篇
  2001年   330篇
  2000年   270篇
  1999年   206篇
  1998年   162篇
  1997年   139篇
  1996年   175篇
  1995年   131篇
  1994年   150篇
  1993年   124篇
  1992年   117篇
  1991年   96篇
  1990年   106篇
  1989年   82篇
  1988年   90篇
  1987年   61篇
  1986年   69篇
  1985年   95篇
  1984年   69篇
  1983年   68篇
  1982年   49篇
  1981年   46篇
  1980年   47篇
  1979年   34篇
  1977年   37篇
  1976年   37篇
  1975年   34篇
  1974年   48篇
  1973年   44篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
991.
Colloidal CdSe nanocrystals were synthesized through a solution process. The CdSe nanocrystals coated on Si(1 0 0) wafers were UV-exposed in either an air or argon atmosphere to distinguish the effect of generated ozone from UV-radiation at 365 nm on the removal of surface capping pyridine molecules. The pyridine on the CdSe nanocrystal's surface could be effectively removed by the ozone generated during UV-exposure with an accompanying highly oxidized surface state of the CdSe nanocrystals. For the removal of surface oxides of CdSe nanocrystals, a successive thermal treatment under ultra high vacuum (UHV) was adopted. The optical energy bandgap measured by using UV-vis absorption spectroscopy showed a red shift with treatment with an increase of annealing temperature. The electronic energy structure of UHV-annealed CdSe nanocrystals film was analyzed in situ using X-ray absorption and photoelectron spectroscopy. A great resemblance was found between the values of the optical and electron energy bandgaps of effectively surface-treated CdSe nanocrystals film after UHV-annealing at 400 °C.  相似文献   
992.
    
This paper uses the moiré interferometry of sticking film in synchronous measurement of 2-D displacements for determining the stress intensity factors of mixed mode. The calculating formula of mixed mode SIF of a beam with an oblique crack has been derived, which can be applied to the general cases in 2-D questions of mixed mode crack. This result is of extensive value for application to engineering questions that has no analytic solutions and numerical value solutions.Projects Supported by Foundation of Natural Sciences of China.  相似文献   
993.
A 35 GHz millimeter-wave radar system has been studied for space debris tracking. The objective is to track the particles ranging in size from 4 mm to 80 mm up to a range of 25 km. The system requires various state-of-the-art technologies including phased arrays, monopulse tracking, pulse compression, high power transmitters, low noise receivers, and pulse integration signal processing techniques.  相似文献   
994.
We construct the parafermionic (of orderq) representation of the Kac-Moody and Virasoro algebra and compare it with a constrained fermionic system. We find that the central charge of the Virasoro algebra of the constrained fermionic system depends on the regularization scheme. Using the path integral method, we demonstrate this dependence for theq=2 case and find that it can have the same central charge as the free parafermionic theory or the non-linear sigma model depending on the regularization scheme. We point out some ambiguity in the quantization of the constrained system in Hamiltonian formulation.  相似文献   
995.
996.
Seven triterpenes, two lignans, and twelve other known compounds were isolated from the non‐alkaloidal fractions of the stem of Ficus septica Among these triterpenoids, a rare triterpene skeleton derivative, 13,27‐cycloursan‐3β‐ylacetate was isolated from natural sources for the first time. All the structures of these compounds were elucidated by spectroscopic methods.  相似文献   
997.
Polymer nanocomposites composed of poly(styrene‐ran‐vinyl phenol) (PSVPh) copolymers and 5 wt % multi‐walled carbon nanotubes (MWNTs) were prepared by three different methods, including melt‐mixing and precipitation. The MWNTs were either oxidized to incorporate oxygenated defects or utilized as received. The mechanical properties of the nanocomposites were measured by dynamic mechanical analysis (DMA), and the extent of intermolecular hydrogen bonding between MWNTs and PSVPh was quantified by infrared (IR). Our DMA results suggest that melt‐mixing leads to more stable morphologies of the final nanocomposites than precipitation. Additionally, the IR analysis of the nanocomposites indicates melt‐mixing can result in the formation of more intermolecular hydrogen bonding between the MWNTs and PSVPh than precipitation, and thus suggests that melt‐mixing leads to more reproducible mechanical properties than precipitation. Our DMA and IR results may provide guidelines to realize the desired morphologies and to improve the properties of polymer carbon nanotube nanocomposites by optimizing intermolecular interactions between MWNTs and polymers using processing. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 1747–1759, 2008  相似文献   
998.
999.
1000.
A formal synthesis of (±)-mitsugashiwalactone ( 1 ) and (±)-isodihydro nepetalactone ( 2 ) was accomplished. Baeyer-Villiger lactonization of ketone 9 followed by acidic treatment led to the rearranged lactone 8 , which underwent a series of functional group transformations to give cyclopentanone derivatives 19 and 20 . Shapiro reaction on 21 and 22 in the presence of excess dry ice gave lactones 5 and 6 . Lactones 5 and 6 previously have been converted to mitsugashiwalactone ( 1 ) and isodihydronepetalactone ( 2 ), respectively.  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