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   22588篇
  免费   2081篇
  国内免费   892篇
电工技术   2026篇
技术理论   7篇
综合类   2393篇
化学工业   1275篇
金属工艺   339篇
机械仪表   417篇
建筑科学   5120篇
矿业工程   1970篇
能源动力   673篇
轻工业   1784篇
水利工程   2087篇
石油天然气   1255篇
武器工业   91篇
无线电   637篇
一般工业技术   1324篇
冶金工业   1664篇
原子能技术   169篇
自动化技术   2330篇
  2024年   62篇
  2023年   293篇
  2022年   656篇
  2021年   850篇
  2020年   892篇
  2019年   604篇
  2018年   603篇
  2017年   617篇
  2016年   814篇
  2015年   777篇
  2014年   1730篇
  2013年   1551篇
  2012年   1846篇
  2011年   1835篇
  2010年   1448篇
  2009年   1571篇
  2008年   1383篇
  2007年   1520篇
  2006年   1462篇
  2005年   1032篇
  2004年   877篇
  2003年   763篇
  2002年   600篇
  2001年   421篇
  2000年   305篇
  1999年   254篇
  1998年   160篇
  1997年   135篇
  1996年   106篇
  1995年   71篇
  1994年   50篇
  1993年   46篇
  1992年   32篇
  1991年   29篇
  1990年   28篇
  1989年   26篇
  1988年   16篇
  1987年   10篇
  1986年   12篇
  1985年   11篇
  1984年   9篇
  1983年   8篇
  1982年   8篇
  1981年   4篇
  1980年   3篇
  1979年   5篇
  1974年   5篇
  1964年   3篇
  1963年   3篇
  1961年   3篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
71.
水利工程建设项目的风险分析   总被引:2,自引:0,他引:2  
水利工程建设中潜藏着众多风险,对风险进行有效分析是工程顺利建设的重要保证。水利工程风险分析是由风险识别、估算、评价、管理、控制决策等组成的科学体系。明确了水利工程中风险的定义,识别了水利工程的风险因素,论述了风险估算和评价的方法,并提出对工程风险进行管理和控制,以保证工程建设顺利进行。  相似文献   
72.
基于物元模型的警务信息化集成风险评价   总被引:1,自引:0,他引:1  
警务信息化建设已经开始进入信息与系统集成的阶段,公安机关在此过程中面临着多种集成风险。分析警务信息化集成的背景与肯面临的各种风险,应用物元模型建立警务信息化集成风险的评价的指标体系与方法,给出相应的计算示例。结果表明该方法有效可行,为警务信息化集成风险评价提供一条新途径。  相似文献   
73.
周逢兰 《安徽建筑》2007,14(1):35-35,37
通过对先张法预应力空心梁板施工时容易忽视和发生的几个质量通病产生原因的分析,并结合工程实际和工作体会,粗略探讨了防治这些质量通病的一些措施和方法。  相似文献   
74.
缪学玉  刘晖  邵德胜 《煤》2003,12(5):9-11
介绍专为倾斜煤层采煤工作面研制的单体防倒组合支架及其应用效果。实践表明,它能有效地解决大倾角工作面单体支护的一些安全问题。  相似文献   
75.
The authors present a theory for understanding risk for problem drinking among reservation-dwelling American Indians. The theory offers an overall framework for understanding the risk process for this group. It considers the distinction between factors that influence mean levels of American Indian problem drinking and factors that influence individual differences in American Indian drinking. It proposes important contextual differences between reservation-dwelling American Indians and Caucasians that may help explain the higher mean levels of American Indian problem drinking. The theory further holds that, within the high mean level of problem drinking characteristic of many American Indian reservations, individual differences in problem drinking can be explained by very similar personality and learning factors as those that influence problem-drinking levels for other ethnic groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
76.
Longitudinal data from a representative sample of 1,978 Black and White adolescents were used to examine the role of personality in multiple risk or problem behaviors. Results indicate that covariation among diverse behaviors (educational underachievement, delinquent behavior, substance use, sexual behavior) can be adequately modeled by a single higher order factor, and that impulsivity and avoidance coping serve as generalized risk factors for involvement in these behaviors. Whereas none of the personality variables examined explained change in problem behaviors once established, avoidance coping prospectively predicted involvement among a subgroup of adolescents with little or no prior involvement. Results suggest that dysfunctional styles of regulating emotions and emotionally driven behaviors are core features of risky or problem behaviors during adolescence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
77.
曙光油田超稠油井套管损坏的机理和防治   总被引:8,自引:0,他引:8  
李卫忠 《钻采工艺》2003,26(2):55-56
超稠油特殊的油藏特点决定了其生产周期短、注汽频繁、出砂、汽窜、超覆现象严重,以及套管质量等因素的影响,套管损坏较为严重。对曙光油田超稠油井套管损坏的规律和机理进行了研究,并从钻井和完井工艺的完善、套管钢级和射孔工艺的选择、采油生产参数的确定、注汽管柱隔热效果的提高、防治砂工艺等方面,对套管损坏提出了预防措施和对策。并对套管损坏井制定了修复再利用方案。  相似文献   
78.
Community violence has emerged as a major risk factor for the development of mental health problems in children and adolescents. If mental health providers are to meet the needs of children and communities dealing with community violence, then they will need to integrate principles from various subdisciplines in psychology (e.g., developmental psychology, school psychology, developmental psychopathology) as well as disciplines outside of psychology (e.g., sociology, public health, medicine) to understand fully the developmental impact of exposure to community violence. The development of such a model is necessary to identify the pathways, risk, and protective factors on which prevention and intervention programs can be built. The goal of this article is to present an ecological-transactional model of community violence as a conceptual framework for understanding the existing literature and for guiding future research on community violence exposure and child development. (PsycINFO Database Record (c) 2011 APA, all rights reserved)  相似文献   
79.
Alcohol expectancy-challenge programs are effective in changing expectancies and reducing drinking in college men (J. Darker & M. S. Goldman. 1993. 1998); however, recent evidence suggests this protocol might not be effective for women (M. E. Dunn, C. Lau, & I. Y. Cruz, 2000). This study was designed to reevaluate the effectiveness of a social/sexual expectancy-challenge intervention in college women reporting moderate to heavy alcohol use. Forty-six undergraduate women were randomly assigned to the prevention or control condition. Participants reported alcohol expectancies at pre- and posttest and monitored their drinking patterns daily for 6 weeks. The program was effective in changing some expectancies but did not reduce drinking. This further confirms differences in the mechanisms by which expectancy-challenge programs function for men and women. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
80.
This article examines the psychological impact of participating in sigmoidoscopy screening for colorectal cancer prevention. The 1st study examined psychological well-being at 3 months, in relation to screening outcome, in 4,153 individuals. The 2nd study used longitudinal data to examine changes in psychological functioning from before to after screening in relation both to screening outcome and baseline indicators of vulnerability. There were few psychological differences between those who had received negative results or had polyps detected. These findings were confirmed in the longitudinal study, which also found no evidence for vulnerability to adverse effects among those who were initially most anxious or who perceived their risk of cancer to be higher. The longitudinal data suggested that screening might produce transient positive effects. (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