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   28338篇
  免费   3112篇
  国内免费   1426篇
电工技术   2813篇
技术理论   8篇
综合类   3079篇
化学工业   1538篇
金属工艺   370篇
机械仪表   793篇
建筑科学   4857篇
矿业工程   1200篇
能源动力   1396篇
轻工业   2281篇
水利工程   2548篇
石油天然气   1138篇
武器工业   400篇
无线电   1274篇
一般工业技术   2332篇
冶金工业   2065篇
原子能技术   430篇
自动化技术   4354篇
  2024年   144篇
  2023年   449篇
  2022年   912篇
  2021年   1165篇
  2020年   1139篇
  2019年   940篇
  2018年   989篇
  2017年   991篇
  2016年   1382篇
  2015年   1224篇
  2014年   2136篇
  2013年   2399篇
  2012年   2175篇
  2011年   2369篇
  2010年   1789篇
  2009年   1769篇
  2008年   1641篇
  2007年   1780篇
  2006年   1688篇
  2005年   1208篇
  2004年   981篇
  2003年   814篇
  2002年   640篇
  2001年   442篇
  2000年   318篇
  1999年   249篇
  1998年   213篇
  1997年   146篇
  1996年   133篇
  1995年   87篇
  1994年   92篇
  1993年   60篇
  1992年   46篇
  1991年   42篇
  1990年   40篇
  1989年   42篇
  1988年   38篇
  1987年   25篇
  1986年   23篇
  1985年   15篇
  1984年   19篇
  1983年   16篇
  1982年   15篇
  1981年   8篇
  1980年   9篇
  1979年   7篇
  1965年   15篇
  1963年   5篇
  1961年   6篇
  1959年   5篇
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
41.
The authors reanalyzed assessment center (AC) multitrait-multimethod (MTMM) matrices containing correlations among postexercise dimension ratings (PEDRs) reported by F. Lievens and J. M. Conway (2001). Unlike F. Lievens and J. M. Conway, who used a correlated dimension-correlated uniqueness model, we used a different set of confirmatory-factor-analysis-based models (1-dimension-correlated Exercise and 1-dimension-correlated uniqueness models) to estimate dimension and exercise variance components in AC PEDRs. Results of reanalyses suggest that, consistent with previous narrative reviews, exercise variance components dominate over dimension variance components after all. Implications for AC construct validity and possible redirections of research on the validity of ACs are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
42.
Using an integrated process of data and modeling in HRA   总被引:1,自引:0,他引:1  
The paper describes an approach taken to estimate the probabilities of failure associated with various railroad tasks to prevent accidents (principally collisions and derailments). These probabilities were estimated using an expert elicitation process that used partially relevant data available from a variety of databases and that were filtered and scaled to make them more directly relevant to the analyses being performed. Extensive qualitative studies were performed prior to the elicitation process to identify relevant contexts under which the tasks can be performed.  相似文献   
43.
针对有线电视系统工程建设的特点,依照《招标投标法》的规定和程序,对有线电视系统工程招标的种类、招标方式、招标工程必备的条件、标底的编制及审定、开标、评标和中标的原则进行详细介绍,对招标文件的编制进行具体说明。  相似文献   
44.
一种新型的多功能照相胶片影像质量评价方法   总被引:1,自引:0,他引:1  
本设计了一种新型的多功能照相胶片感光性能和影像质量评价方法。这种方法的主要特点的快速、方便并有满足 实用要求的精确度。该方法仅使用一个测试标板,就可以很容易地测定出照相胶片的感光性能、分辨率、均方根粒度和密度振幅响应(DAR)值等多种表征影像质量的参数。本简要介绍该方法并给出试验结果及其与传统测试方法的比较和讨论意见。  相似文献   
45.
现役水工钢闸门结构可靠性鉴定时荷载取值分析   总被引:2,自引:0,他引:2       下载免费PDF全文
采用类比法确定现役水工钢闸门结构的荷载评估基准期。以静水压力为例,得了其在荷载评估基准期内的统计参数,讨论了闸门主梁受弯碱坏时可靠指标随继续使用期的变化。  相似文献   
46.
Systematic assessment of anger among people with developmental disabilities has been lacking, especially for hospital inpatients. Reliability and validity of anger self-report psychometric scales were investigated with 129 male patients, mostly forensic. Anger prevalence and its relationship to demographic, cognitive, and personality variables and to hospital assaultive behavior were examined. High internal and intermeasure consistency, and some concurrent validity with staff ratings, were found. Retrospective validity regarding physically assaultive behavior in the hospital was obtained. Hierarchical regressions revealed that patient-reported anger was a significant predictor of assaults postadmission, controlling for age, length of stay, IQ, violence offense history, and personality variables. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
47.
灰色关联分析法在油气管道半定量风险评价中的应用   总被引:2,自引:0,他引:2  
肯特(W.kent Muhlbauer)管道风险评价法是一种半定量风险评价法,但是该方法在我国还处在起步阶段,其理论基础和应用技术都很不完善。为了有效处理评分中存在的主观性和不确定性因素,已经把模糊综合评判法引入到管道风险评价中。但是,传统的相对风险值计算还不够准确,为此介绍了灰色关联分析在油气管道半定量风险评价中的应用。通过对影响管道风险的评价指标(因素)体系的综合分析,确定了灰色综合评价的层次结构模型。构建了由第三方破坏指数、腐蚀指数、设计指数、错误指数、介质危险指数5大指标体系构成的管道系统风险综合评价指标体系,并采用层次分析与专家打分相结合的方法计算权重。在油气管道半定量风险评价中应用灰色关联分析法,可以使评价结果更准确。  相似文献   
48.
油气圈闭地质评价方法及应用   总被引:18,自引:3,他引:15  
本从含油气系统理论出发,对圈闭成藏的油源,储层,圈闭,保存,配套史制定分级评价标准,并赋予相应的评价系数,在此基础上应用地质风险概率理论与模糊数学的方法,在微机上定量评价圈闭含油气性。  相似文献   
49.
A CEC-funded project has been performed to tackle the problem of producing an advanced Life Monitoring System (LMS) which would calculate the creep and fatigue damage experienced by high temperature pipework components. Four areas were identified where existing Life Monitoring System technology could be improved:
1. 1. the inclusion of creep relaxation
2. 2. the inclusion of external loads on components
3. 3. a more accurate method of calculating thermal stresses due to temperature transients
4. 4. the inclusion of high cycle fatigue terms.

The creep relaxation problem was solved using stress reduction factors in an analytical in-elastic stress calculation. The stress reduction factors were produced for a number of common geometries and materials by means of non-linear finite element analysis. External loads were catered for by producing influence coefficients from in-elastic analysis of the particular piping system and using them to calculate bending moments at critical positions on the pipework from load and displacement measurements made at the convenient points at the pipework. The thermal stress problem was solved by producing a completely new solution based on Green's Function and Fast Fourier transforms. This allowed the thermal stress in a complex component to be calculated from simple non-intrusive thermocouple measurements made on the outside of the component. The high-cycle fatigue problem was dealt with precalculating the fatigue damage associated with standard transients and adding this damage to cumulative total when a transient occurred.

The site testing provided good practical experience and showed up problems which would not otherwise have been detected.  相似文献   

50.
This study, which is based on responses from over 300 individuals in England and Wales, explores how a willingness to use a water-recycling system of specific configuration varies against a number of factors which are linked to system design, system scale, system context, and water-conservation behaviour. Findings show that there is broad willingness to accept in-house water recycling provided that public health is not compromised.  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