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   300篇
  免费   4篇
电工技术   12篇
化学工业   26篇
金属工艺   3篇
机械仪表   5篇
建筑科学   3篇
能源动力   9篇
轻工业   14篇
水利工程   2篇
石油天然气   1篇
无线电   27篇
一般工业技术   42篇
冶金工业   114篇
自动化技术   46篇
  2023年   2篇
  2019年   2篇
  2018年   2篇
  2015年   1篇
  2014年   4篇
  2013年   11篇
  2012年   5篇
  2011年   2篇
  2010年   3篇
  2009年   2篇
  2008年   3篇
  2007年   5篇
  2006年   9篇
  2005年   5篇
  2004年   6篇
  2003年   8篇
  2002年   4篇
  2001年   2篇
  2000年   8篇
  1999年   9篇
  1998年   31篇
  1997年   25篇
  1996年   19篇
  1995年   12篇
  1994年   10篇
  1993年   12篇
  1992年   9篇
  1991年   6篇
  1990年   7篇
  1989年   4篇
  1988年   1篇
  1987年   2篇
  1986年   8篇
  1985年   6篇
  1984年   4篇
  1983年   7篇
  1982年   3篇
  1981年   4篇
  1980年   2篇
  1979年   8篇
  1978年   3篇
  1977年   8篇
  1976年   6篇
  1975年   3篇
  1973年   1篇
  1972年   2篇
  1971年   1篇
  1970年   2篇
  1965年   1篇
  1940年   1篇
排序方式: 共有304条查询结果,搜索用时 0 毫秒
61.
Assessed the effects of learning computer programming and computer-assisted instruction (CAI) on specific cognitive skills (classification and seriation operations), metacognitive skills, creativity, and achievement (reading, mathematics, and ability to describe directions). 72 6- and 8-yr-old children were pretested to assess pretreatment level of operational competence (classification and seriation), creativity, and achievement. Ss were then randomly assigned to 1 of 3 22-wk treatment conditions: Logo computer language programming, CAI, or control. Results from posttests reveal that the programming group scored significantly higher on measures of operational competence and creativity, on describing directions, and on 2 of 3 measures of metacognitive skills. No differences were found on measures of reading and mathematics achievement. (30 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
62.
Surveyed 336 clinical psychologists to assess the extent and nature of their involvement in management functions. Findings indicate that 225 Ss (67%) claimed management as one of their major professional roles, occupying an average of 33% of their work time. These proportions varied little across diverse work settings or age groups. Most Ss reported that they felt inadequately prepared for their management roles. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
63.
Rapidly developing proteomic tools are improving detection of deregulated kallikrein-related peptidase (KLK) expression, at the protein level, in prostate and ovarian cancer, as well as facilitating the determination of functional consequences downstream. MS-driven proteomics uniquely allows for the detection, identification, and quantification of thousands of proteins in a complex protein pool, and this has served to identify certain KLKs as biomarkers for these diseases. In this review, we describe applications of this technology in KLK biomarker discovery and elucidate MS-based techniques that have been used for unbiased, global screening of KLK substrates within complex protein pools. Although MS-based KLK degradomic studies are limited to date, they helped to discover an array of novel KLK substrates. Substrates identified by MS-based degradomics are reported with improved confidence over those determined by incubating a purified or recombinant substrate and protease of interest, in vitro. We propose that these novel proteomic approaches represent the way forward for KLK research, in order to correlate proteolysis of biological substrates with tissue-related consequences, toward clinical targeting of KLK expression and function for cancer diagnosis, prognosis, and therapies.  相似文献   
64.
The growing involvement of psychologists in the management of human services, particularly in the public sector, has not been reflected in the development of corresponding academic or practicum training focusing on issues of service delivery. This article gives an overview of the practitioner-manager role and develops a rationale for management-oriented training in doctoral programs. An introductory course is briefly noted, and a review of models, knowledge and skills, and training resources is provided. Also described are practitioner-manager trends, training alternatives, and competing demands of the graduate curriculum. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
65.
66.
67.
68.
The preparation and full NMR ((1)H, (13)C and (31)P) characterisation of three [R(3)PAu(2mba)] complexes, Where R = Et, Ph and Cy, and 2mba is the anion derived from 2-mercaptobenzoic acid is reported. An interesting solvent dependence in the (1)H spectra is rationalised in terms of competing intra- and inter-molecular hydrogen bonding. An X-ray analysis of the [Ph(3) PAu(2mba)] species reveals a linear P-Au-S arrangement and association in the lattice via the familar carboxylic acid dimer motif. The in Vitro cytotoxicity against seven human tumout lines is also described. The complexes display moderate to very high activity. Particularly noteworthy is their greater activity against the H226 cell line (non-small cell lung cancer) compared with that displayed by a range of cytotoxic drugs.  相似文献   
69.
A boundary element method is derived for solving the two-dimensional heat equation for an inhomogeneous body subject to suitably prescribed temperature and/or heat flux on the boundary of the solution domain. Numerical results for a specific test problem is given.  相似文献   
70.
The Minimum Data Set (MDS), a Health Care Financing Administration (HCFA)-mandated resident assessment system used in community nursing homes, is potentially useful for assessing nutritional status. We compared anthropometric measures of nutritional status available in the MDS [weight and body mass index (BMI)] with other anthropometric and bioelectrical measures of nutritional status, not available on the MDS. We also studied associations of MDS-measured clinical characteristics of nursing home residents with anthropometric and bioelectrical measures of lower and higher nutritional status, defined as measures in the 25th percentile and below, and 75th percentile and above, respectively. Data were from a sample of residents of an academic long-term care facility (n = 186, 75% female, mean age 89.9 +/- 5.6 y). Results were as follows: 1) MDS measures of weight and BMI were significantly correlated with all the anthropometric and bioelectrical measures of nutritional status in women, and most measures in men; 2) some MDS variables, including poor oral intake and advanced cognitive decline, were significantly associated with two or more anthropometric and bioelectrical measures of low nutritional status; and 3) complaints of hunger were significantly associated with two or more anthropometric and bioelectrical measures of high nutritional status. Results suggest that 1) weight and BMI, available in the MDS, are correlated with other measures of nutritional status not available, and 2) MDS clinical variables are associated with measures of low and high nutritional status, and may be useful in identifying patients at nutritional risk.  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