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   1326篇
  免费   2篇
电工技术   3篇
综合类   1篇
化学工业   44篇
金属工艺   6篇
机械仪表   5篇
建筑科学   16篇
矿业工程   1篇
能源动力   10篇
轻工业   24篇
水利工程   1篇
无线电   23篇
一般工业技术   28篇
冶金工业   1135篇
原子能技术   2篇
自动化技术   29篇
  2020年   2篇
  2019年   3篇
  2018年   4篇
  2017年   7篇
  2014年   2篇
  2013年   8篇
  2012年   8篇
  2011年   12篇
  2010年   4篇
  2009年   4篇
  2008年   7篇
  2007年   5篇
  2006年   8篇
  2005年   10篇
  2004年   10篇
  2003年   7篇
  2002年   6篇
  2001年   6篇
  2000年   10篇
  1999年   31篇
  1998年   365篇
  1997年   200篇
  1996年   123篇
  1995年   65篇
  1994年   78篇
  1993年   58篇
  1992年   10篇
  1991年   23篇
  1990年   9篇
  1989年   19篇
  1988年   12篇
  1987年   14篇
  1986年   14篇
  1985年   17篇
  1984年   3篇
  1983年   6篇
  1982年   5篇
  1981年   7篇
  1980年   11篇
  1979年   4篇
  1978年   3篇
  1977年   26篇
  1976年   79篇
  1975年   3篇
  1974年   2篇
  1973年   3篇
  1970年   3篇
  1969年   3篇
  1963年   1篇
  1958年   1篇
排序方式: 共有1328条查询结果,搜索用时 15 毫秒
1.
2.
This report summarizes the panel held at the 109th Annual Convention, American Psychological Association, August 26, 2001, San Francisco. The chair was William Glover and the speakers were Samuel Gerson, Karen Maroda, and Andre Patsalides. The invited symposium was directed at discussing different perspectives related to the presence of desire in the analytic process. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
3.
Two mobilizable cloning vectors, designated pABW1 and pAWB2, were constructed basing on the E. coli vector pBGS18 and oriT originating from RK2. In pABW2 the kanamycin resistance gene was replaced by a novel tetracycline resistance cassette derived from Tn1721. Both vectors, specific for E. coli, allow to perform the cloning steps in E. coli and then to efficiently transfer the constructs by conjugation to the host of choice. A vector which cannot propagate in the given host can be applied for identification of the host specific plasmid replicator regions. With the use of pABW2 we defined the minimal replicator region of pTAV202-a mini-derivative of the large pTAV1 plasmid of P. versutus. We also proved that RepC' encoded on this fragment is the principal initiator replication protein and that oriV is located along its coding sequence.  相似文献   
4.
5.
In 1895 Trendelenburg described his sign to determine the integrity of hip function. We found the sign to be positive in a patient whose hip was clinically and radiologically normal, and therefore investigated this in other patients. We confirmed that a medial shift of the mechanical axis of the leg below the hip may cause a positive Trendelenburg sign. This has not been previously described.  相似文献   
6.
Cigarette smoking continues to be the single, most preventable cause of death and disability in the United States. For individuals who have cancer, continuing to smoke negatively impacts their treatment, survival, and risk for second primary tumors. This review of behavioral and pharmacological approaches to smoking cessation focuses on the recent comprehensive review of cessation interventions by the Agency for Health Care Policy and Research (AHCPR), as well as on new developments in the field. An intervention model is outlined that provides oncologists with a brief and easily implemented method of systematically treating patients who smoke. By assessing patient smoking status, advising smoking patients to quit, and proactively assisting their patients in quitting, oncologists can significantly influence patient health and fulfill their professional and ethical responsibility to address this life-threatening behavior.  相似文献   
7.
8.
Islet amyloid polypeptide forms islet amyloid deposits in non-insulin-dependent diabetes mellitus. We have generated transgenic mice which express human islet amyloid polypeptide in their pancreatic beta cells yet do not develop islet amyloid deposits despite producing levels of the amyloidogenic human peptide 2 - 3 fold higher than the native (mouse) peptide. To determine whether marked overproduction of islet amyloid polypeptide is a potential cause of islet amyloid formation, we increased expression of this transgene by producing homozygous transgenic animals and by making heterozygous mice experimentally insulin resistant with nicotinic acid. Pancreatic content of islet amyloid polypeptide-like immunoreactivity in homozygous and nicotinic acid-treated mice was 2-fold (25 +/- 7 fmol/microg; n = 6) and 3.5-fold (47 +/- 20 fmol/microg; n = 3) higher, respectively, than that of untreated heterozygous animals (13+/-2 fmol/microg; n = 11; both p < 0.05). Despite this marked increase in production of islet amyloid polypeptide, neither group of mice developed gross islet amyloid deposits even after 16 months of age. We conclude that overproduction of islet amyloid polypeptide, even as produced by extreme insulin resistance, is not in itself sufficient for islet amyloid formation.  相似文献   
9.
10.
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