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   14669篇
  免费   1894篇
  国内免费   654篇
电工技术   677篇
技术理论   1篇
综合类   1301篇
化学工业   1499篇
金属工艺   329篇
机械仪表   474篇
建筑科学   2021篇
矿业工程   386篇
能源动力   1752篇
轻工业   967篇
水利工程   2688篇
石油天然气   347篇
武器工业   56篇
无线电   609篇
一般工业技术   1203篇
冶金工业   1363篇
原子能技术   81篇
自动化技术   1463篇
  2024年   102篇
  2023年   281篇
  2022年   514篇
  2021年   585篇
  2020年   678篇
  2019年   618篇
  2018年   534篇
  2017年   583篇
  2016年   690篇
  2015年   648篇
  2014年   860篇
  2013年   983篇
  2012年   979篇
  2011年   1193篇
  2010年   826篇
  2009年   831篇
  2008年   829篇
  2007年   913篇
  2006年   778篇
  2005年   631篇
  2004年   493篇
  2003年   497篇
  2002年   400篇
  2001年   295篇
  2000年   222篇
  1999年   168篇
  1998年   140篇
  1997年   125篇
  1996年   90篇
  1995年   80篇
  1994年   99篇
  1993年   63篇
  1992年   61篇
  1991年   39篇
  1990年   32篇
  1989年   36篇
  1988年   34篇
  1987年   23篇
  1986年   22篇
  1985年   19篇
  1984年   13篇
  1983年   10篇
  1982年   11篇
  1971年   8篇
  1968年   15篇
  1965年   11篇
  1964年   17篇
  1961年   12篇
  1958年   8篇
  1957年   14篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
Structural, mean- and individual-level, differential, and ipsative personality continuity were examined in 599 patients treated for major depression assigned to 1 of 6 forms of a 6-month pharmaco-psychotherapy program. Covariation among traits from the Five Factor model remained invariant across treatment, and patients described themselves as slightly more extraverted, open to experience, agreeable and conscientious, and substantially more emotional stable after treatment. Trait changes were only to a small extent explained by changes in depression severity. There was evidence for differential, individual-level, and ipsative stability, with stable personality profiles in terms of shape and to a lesser extent in terms of scatter and elevation. Traits remain relatively stable, except for emotional stability, despite the depressive state and the psychopharmacological interventions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
62.
利用差示扫描量热仪、傅里叶红外光谱仪、广角X射线衍射仪研究了一种新型的以聚乙二醇为软段的聚氨酯相变储能材料。结果表明,当软段含量低于90%(质量分数,下同)时,即使温度高于聚乙二醇的熔点,此类材料仍不会熔化成液体,而表现出一种固-固相变行为。该聚氨酯储能材料相变焓较大,相变温度适中,且随着软段含量的减少,材料相变焓和相变温度呈递减趋势。其相变过程实质是聚氨酯软段聚乙二醇由结晶固态转变为无定形固态的过程。  相似文献   
63.
64.
水文学的研究方法与理论创新   总被引:3,自引:2,他引:1       下载免费PDF全文
回顾了水文学在其 30 0余年的形成和发展中曾出现过的若干引人入胜、富有启发性、对学科发展起着重要推动作用的研究成果 .论述了“假设”、“猜想”、“推理”、“比拟”、“综合”和“实验”等研究方法的运用在水文学理论创新中的重要作用 .  相似文献   
65.
A comprehensive, GIS‐based modelling approach is developed to estimate runoff and phosphorus transport within a watershed at a daily time step. The approach relies on the use of GIS data for deriving major critical model parameters that exhibit distinct spatial variability over the catchment. Surface runoff is calculated by a modified rational method, which depends upon rainfall intensity, soil moisture status, slope, land‐use and soil characteristics. Phosphorus loading is estimated as a function of the runoff volume and the event mean concentration for different land use categories. A diffusive approximation method is used to trace runoff and phosphorus transport to the basin outlet. The modelling approach is tested in the Margecany catchment, Hornad River basin, Slovakia, to simulate runoff, phosphorus loading, and its transport on a daily time scale using data observed between 1995 and 2000. Satisfactory results of the hydrographs and phosphorus concentration at the basin outlet are obtained, though more efforts regarding the phosphorus cycling and its biochemical reactions need to be clarified by further research. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   
66.
67.
The fabrication of functional textiles able to provide thermal regulation and comfort for the body has attracted increasing interest in recent years. This research investigated fabric coatings containing energy absorbing, temperature stabilizing, phase‐change material microcapsules (PCMMcs), and their methods of application. Specifically, a coated fabric was directly prepared by a dual‐type coating method, in which the PCMMcs were dispersed in a polyurethane coating solution with no binder. The thermal performances of the dual‐coated samples were evaluated by differential scanning calorimetry, and their physical characteristics were examined by scanning electron microscopy, thermal vision camera, porosity, water vapor transmission rate (WVTR), and water entry pressure (WEP) analyses. Furthermore, the microclimate characteristics of the thermally enhanced fabrics were investigated under experimental conditions using a human‐clothing‐environment (HCE) simulator system. The study results confirmed the superior performance of the dual‐coated fabrics in terms of thermal regulation and body comfort, compared with those coated by the dry or wet coating method, because of the improved WEP, WVTR, and thermal performance. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008  相似文献   
68.
公路工程变更与索赔   总被引:1,自引:1,他引:0  
张涛 《山西建筑》2003,29(10):113-114
介绍了公路工程施工中引起的各种索赔问题,阐述了索赔的方法与技巧,指出只有掌握和运用索赔理由和方法,才能有效地控制成本,提高经济效益。  相似文献   
69.
Performance variability across repeated task administrations may be an important indicator of age-related cognitive functioning. In the present investigation, the authors examined whether age differences and change in inconsistency were related to 6-year (3 occasion) cognitive change. Inconsistency scores were computed from 4 reaction time tasks performed by 446 older adults (54-89 years). Replicating previous cross-sectional results, greater inconsistency was observed for older participants even after controlling for differences in response speed. New longitudinal results demonstrated (a) associations between inconsistency at baseline measurement and 6-year change in cognitive performance; (b) longitudinal change in inconsistency; and (c) intraindividual covariation between 6-year change in inconsistency and 6-year change in level of cognitive function. These findings support the view that performance variability serves as a marker of cognitive aging. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
70.
Dynamics of the explosive growth of a vapor bubble in microgravity is investigated by direct numerical simulation. A front tracking/finite difference technique is used to solve for the velocity and the temperature field in both phases and to account for inertia, viscosity, and surface deformation. The method is validated by comparison of the numerical results with the available analytical formulations such as the evaporation of a one-dimensional liquid/vapor interface, frequency of oscillations of capillary waves, and other numerical results. Evolution of a three-dimensional vapor nucleus during explosive boiling is followed and a fine scale structure similar to experimental results is observed. Two-dimensional simulations yield a similar qualitative instability growth.  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