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   22803篇
  免费   877篇
  国内免费   83篇
电工技术   293篇
综合类   44篇
化学工业   5150篇
金属工艺   478篇
机械仪表   461篇
建筑科学   1720篇
矿业工程   160篇
能源动力   686篇
轻工业   2136篇
水利工程   182篇
石油天然气   56篇
武器工业   1篇
无线电   1483篇
一般工业技术   4162篇
冶金工业   2770篇
原子能技术   137篇
自动化技术   3844篇
  2023年   153篇
  2022年   308篇
  2021年   534篇
  2020年   313篇
  2019年   329篇
  2018年   493篇
  2017年   426篇
  2016年   531篇
  2015年   481篇
  2014年   691篇
  2013年   1508篇
  2012年   1081篇
  2011年   1520篇
  2010年   1092篇
  2009年   1043篇
  2008年   1268篇
  2007年   1098篇
  2006年   939篇
  2005年   865篇
  2004年   774篇
  2003年   689篇
  2002年   660篇
  2001年   392篇
  2000年   376篇
  1999年   412篇
  1998年   409篇
  1997年   371篇
  1996年   340篇
  1995年   294篇
  1994年   301篇
  1993年   297篇
  1992年   250篇
  1991年   214篇
  1990年   201篇
  1989年   230篇
  1988年   186篇
  1987年   177篇
  1986年   174篇
  1985年   239篇
  1984年   214篇
  1983年   185篇
  1982年   168篇
  1981年   195篇
  1980年   130篇
  1979年   147篇
  1978年   143篇
  1977年   127篇
  1976年   138篇
  1975年   120篇
  1974年   105篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
Determined the specific type of sexual functioning deficits and the relationship between global sexual satisfaction and adjustment in 2 related life areas (marital relationship and body image) for 2 groups of cancer patients at high risk for sexual difficulties. The 2 groups included 16 27–67 yr old females with Stage 2 breast cancer and 16 31–65 yr old females with gynecologic cancer. These Ss were compared to 16 healthy female outpatients (controls). Measures included the Sexual Activities scale from the Derogatis Sexual Functioning Inventory, a modified version of the Dyadic Assessment Scale (marital adjustment), a global sexual evaluation, and a body-image scale. Analyses revealed that the aspects of sexual functioning for breast-cancer and gynecologic-cancer Ss that differed from those of controls were the frequency of sexual behaviors and the level of sexual arousal. Whereas Ss' evaluations of their current sexual life had no relationship to their marital-adjustment ratings, analyses suggested that body-image disruption may be a prevalent problem for gynecologic cancer patients. Data suggest that cancer diagnosis and treatment are instrumental in producing reductions in sexual activity and arousability. (34 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
32.
33.
Previous solid state analyses of sintering in Ti4+-doped-commercial alumina are shown to be in error because a liquid phase exists in the appropriate region of the Al2O3−TiO3−Na2Ophase diagram at least by 1350°C, a temperature lower than that at which "solid state" studies were conducted. It is suggested that liquid-phase sintering is a much more common occurrence than was realized formerly.  相似文献   
34.
The Al-MCM-41 has been used as support to prepare Mo-containing catalysts. The 12- molybdophosphoric heteropoly acid (HPMo) is used as initial compound. The catalysts are synthesized by two different methods: incipient impregnation with aqueous solution of the acid and mechanochemical synthesis. The samples were tested in the reaction of the thiophene hydrodesulfurization after activation with mixture H2 + H2S. The effect of the preparation method of the catalysts on their physicochemical and catalytic properties has been studied. A partial destruction of the loaded compound is observed in mechanochemically treated sample whereas the aggregates are formed from the particles of different size in the impregnated sample. The specific surface area of the sample prepared by mechanical–chemical treatment decreases 2–3 times, while the total pore volume is about four times lower. The HDS activity is higher on the impregnated sample than on the mechanochemically treated one.  相似文献   
35.
This work demonstrated a novel and potentially important application of two-dimensional small-angle X-ray scattering (2D-SAXS) to investigate powder compaction. SAXS from powder compacts of three materials commonly used for pharmaceutical tabletting exhibited azimuthal variations, with stronger intensity in the direction of the applied compaction force, relative to the transverse direction. This implied that compaction of a (macroscopic) powder could also produce changes on the molecular (nanometre) scale, which can be probed by 2D-SAXS. Two possible explanations for this effect were suggested. A combination of anisometric (i.e. elongated or flattened) granules with anisotropic morphologies could result in azimuthal variation in X-ray scattering due to granule orientation. It is expected that this mechanism would require relatively low packing density, so may operate during die filling. Granule re-orientation appeared less likely at higher packing densities and compaction pressures, however. Under these conditions, the changes in the 2D-SAXS patterns would be consistent with the powder granules becoming relatively flattened in the compression direction, with corresponding changes in their nano-scale morphology. The magnitude of this effect was found to vary between the materials used and increased with compaction pressure. This suggested that 2D-SAXS studies could provide useful information on force-transmission within a compressed powder. Further analysis of the data also suggested differences in the compaction mechanisms (i.e. granule re-orientation, deformation or fragmentation) between the materials studied.  相似文献   
36.
In the present work the formation of the interface between polycrystalline silver and thin films of titanium oxide was studied with photoelectron spectroscopy (XPS, UPS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). Titanium oxide was deposited stepwise on 100 nm thick silver films by reactive magnetron sputtering allowing to study the evolution of the interface formation process. The process involves two steps: formation of thin layer of silver oxide and subsequent growth of the TiO2 film. For better understanding of the silver oxidation process, pure silver films were exposed to a low temperature Ar/O plasma for different time intervals providing a possibility to investigate early stages of the oxide film growth.  相似文献   
37.
38.
39.
串行多路传输总线如CAN或LIN可以解决车内因导线过多所带来的许多问题。低成本的LIN总线很适合应用于车门等这些对传输速率要求不高的场合,最高速率为20kbit/s的LIN总线完全可以满足要求。车外温度显示就是这样一个应用实例,外部温度传感器通常布置在后视镜中,数据产生于车门。但是实际显示位置是距此一定距离的车内,LIN总线可使布线简单,因为LIN节点只有3根导线:LIN数据线、电源线和地线。  相似文献   
40.
Defining visualization education is still a work in progress. Visualization education is not just a subject within computer science. Computer scientists are not always the appropriate choice to teach visualization courses on their own. Visualization is not just mastering a set of concepts but acquiring skills. Student should learn by doing, either using one tool or a variety of tools, depending on the course's focus.  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