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   8338篇
  免费   234篇
  国内免费   10篇
电工技术   88篇
综合类   13篇
化学工业   1756篇
金属工艺   136篇
机械仪表   108篇
建筑科学   484篇
矿业工程   47篇
能源动力   207篇
轻工业   801篇
水利工程   107篇
石油天然气   38篇
无线电   505篇
一般工业技术   1164篇
冶金工业   2116篇
原子能技术   95篇
自动化技术   917篇
  2022年   81篇
  2021年   120篇
  2020年   98篇
  2019年   97篇
  2018年   106篇
  2017年   107篇
  2016年   123篇
  2015年   109篇
  2014年   164篇
  2013年   433篇
  2012年   280篇
  2011年   354篇
  2010年   280篇
  2009年   305篇
  2008年   363篇
  2007年   349篇
  2006年   307篇
  2005年   260篇
  2004年   231篇
  2003年   238篇
  2002年   211篇
  2001年   147篇
  2000年   142篇
  1999年   142篇
  1998年   120篇
  1997年   118篇
  1996年   114篇
  1995年   139篇
  1994年   130篇
  1993年   123篇
  1992年   132篇
  1991年   90篇
  1990年   108篇
  1989年   122篇
  1988年   116篇
  1987年   113篇
  1986年   117篇
  1985年   146篇
  1984年   135篇
  1983年   118篇
  1982年   130篇
  1981年   126篇
  1980年   89篇
  1979年   123篇
  1978年   120篇
  1977年   103篇
  1976年   87篇
  1975年   84篇
  1974年   90篇
  1973年   99篇
排序方式: 共有8582条查询结果,搜索用时 15 毫秒
991.
992.
Spezzano replies to Tabin's 1995 review of his book Affect in Psychoanalysis (see record 1993-97622-000). Spezzano addresses Tabin's impression that he wrote the entire volume only to make the point that affects matter. He points out that the argument in the book is that not only were affects implicitly or explicitly treated as derivatives of something else in each psychoanalytic theory, but that there is a possibility of pulling elements from seemingly incompatible theories together if one assumes affects to be the foundational elements of psychological life rather than derivative. Spezzano makes several other detailed points about his views on Tabin's review of his book. (PsycINFO Database Record (c) 2011 APA, all rights reserved)  相似文献   
993.
Somatic cell and gene therapy involve the application of biological technologies to an individual patient through the use of living cells which provide a therapeutic benefit (Aliski, 1991). Various forms of cellular and gene therapies are being developed and evaluated in an increasing number of clinical trials for congenital and acquired disorders. The potential and progress of these therapeutic applications have resulted in an increasing effort by the Food and Drug Administration (FDA) to develop the regulatory framework under which these therapeutic approaches would insure safety and efficacy, the primary mandate of the FDA. Over five years ago Cellcor began to define the parameters, specifications, and conditions relevant to a Quality Assurance/Quality Control (QA/QC) program that has evolved to insure safety and maximize the efficacy of applications of the company's ex vivo technology, autolymphocyte therapy. Autolymphocyte therapy is an outpatient form of somatic cell immunotherapy based upon the infusion of T cells that have been activated ex vivo using a combination of previously generated autologous cytokines and an anti-CD3 monoclonal antibody. We have been able to demonstrate the feasibility for the safe, controlled, and consistent preparation and delivery of a cellular therapy by application of relevant GMP regulations. This presentation reviews aspects of this program and chronicles our experience which at present amounts to over 4400 in fusions for over 700 patients. This program provides a high degree of assurance that a cellular therapy program can be carried out in a multisite mode involving hundreds of patients through the strict adherence to cGMP as set forth in existing regulations.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
994.
The experiment in this article extended studies by A. W. Inhoff and K. Rayner (see record 1988-06513-001) and J. M. Henderson and F. Ferreira (see record 1990-18858-001) to determine how the printed frequency of two adjacent words influenced the benefit of having parafoveal preview of the 2nd word. High- and low-span participants (assessed by M. Daneman and P. A. Carpenter's, [see PA, Vol 66:2775] Reading Span Test) were tested to determine whether working memory capacity influenced parafoveal preview benefit. Parafoveal preview benefit was determined by an interaction of both words' frequencies in first fixation and by the 2nd word's frequency in gaze duration. However, readers were generally fixated closer to the beginning of the 2nd word when the 1st word was low frequency. When the viewing distance confound was minimized, the prior word's frequency did affect parafoveal preview benefit. Parafoveal preview benefit did not vary between reading groups. Group distributions of fixation duration provided no evidence for J. M. Henderson and F. Ferreira's fixation cutoff model. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
995.
996.
A critical survey of available information on primary and secondary cooling as affecting solidification constants, and their validity in mathematical modeling. A review of the mathematics of reciprocation. Comments on the function and mode of mold lubrication. The important effects of the above parameters and of liquid metal handling procedures on the internal and external quality of strand cast billets and slabs.  相似文献   
997.
A technique employing diagnostic ultrasound to evaluate lateral pharyngeal wall motion during connected discourse is described. The validity and reliability of the procedure are discussed. Typical displacement patterns are shown for normal speakers and applications to cleft palate and laryngectomized speakers discussed.  相似文献   
998.
999.
Evaluated anxiety and performance on concrete and abstract criterion-referenced mathematics tests for 267 1st and 2nd graders assigned to either individualized multiage programs (IMP) or traditional learning environments (TRAD). The State-Trait Anxiety Inventory for Children (STAIC) was used to measure anxiety. Lower trait and state anxiety was associated with the IMP program, and anxiety-reducing effects were greater for 2nd graders. High A-Trait 1st graders performed more poorly than low A-Trait 1st graders. Although IMP 1st graders were lower in A-Trait than TRAD children, they did not differ in performance. For 2nd graders, the IMP environment facilitated the performance of high A-Trait children, but resulted in poorer performance for low A-Trait children. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
1000.
J. Kellerman (see record 1979-26395-001) argues that use of psychiatric patients in a study designed to search for psychosomatic etiological factors in neoplasms may have led to the present authors' negative results (see record 1978-03712-001). It is suggested, however, that the use of psychiatric patients increased the heterogeneity of the sample and probably enhanced, not limited, the likelihood of positive findings. It is also suggested that the inclusion of alcoholics in the study may have masked real differences between neoplasm and control Ss. However, new analyses run on subsets of the malignancy and malignancy-control samples from which alcoholics were first deleted failed to support his contention. New analyses run to test for differences between the frequencies of various high-scale MMPI types in neoplasm and control groups also failed to support the view that neoplasm patients are qualitatively different from controls on the inventory. (2 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)  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