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   23529篇
  免费   2758篇
  国内免费   1614篇
电工技术   1757篇
综合类   2281篇
化学工业   1658篇
金属工艺   404篇
机械仪表   1378篇
建筑科学   3427篇
矿业工程   4234篇
能源动力   728篇
轻工业   274篇
水利工程   729篇
石油天然气   584篇
武器工业   428篇
无线电   1748篇
一般工业技术   1277篇
冶金工业   938篇
原子能技术   107篇
自动化技术   5949篇
  2024年   95篇
  2023年   291篇
  2022年   635篇
  2021年   864篇
  2020年   909篇
  2019年   683篇
  2018年   593篇
  2017年   742篇
  2016年   908篇
  2015年   978篇
  2014年   1843篇
  2013年   1484篇
  2012年   2108篇
  2011年   2163篇
  2010年   1715篇
  2009年   1621篇
  2008年   1624篇
  2007年   1738篇
  2006年   1400篇
  2005年   1141篇
  2004年   897篇
  2003年   775篇
  2002年   601篇
  2001年   461篇
  2000年   334篇
  1999年   248篇
  1998年   197篇
  1997年   180篇
  1996年   137篇
  1995年   106篇
  1994年   132篇
  1993年   62篇
  1992年   44篇
  1991年   39篇
  1990年   28篇
  1989年   27篇
  1988年   17篇
  1987年   10篇
  1986年   8篇
  1985年   13篇
  1984年   10篇
  1983年   6篇
  1982年   4篇
  1979年   4篇
  1970年   3篇
  1969年   2篇
  1960年   3篇
  1959年   2篇
  1957年   2篇
  1951年   3篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
胡澄清 《中国陶瓷》2003,39(4):57-59
本文讨论了景德镇陶瓷业存在的问题,并探讨如何更好地发展景德镇陶瓷业,从而实现再度辉煌。  相似文献   
92.
本文介绍了一种特殊的高转速、无稳心搅拌系统,具备简洁、高效、稳定、安全的特点,经使用证明,效果良好,性能可靠,为高速搅拌及无稳心反应釜的应用提供了一条新的设计及运用的途径。  相似文献   
93.
Carbon materials are often used as catalyst supports, and for catalysts in electrodes of a polymer electrolyte fuel cell, carbon black has been used. Recently, it was found, however, that activated carbon could replace carbon black and besides, significantly improve the activity of the electrode catalyst layer for oxygen reduction. In the present study, to optimize the pore structure of activated carbon for further activity improvement, the influence of the pore structure on the activity was investigated using activated carbon of various specific surface areas and mean pore diameters. A catalyst layer was formed from activated carbon loaded with platinum and a polymer electrolyte. The activity of the layer was measured in an oxygen-saturated perchloric acid solution, supporting the layer on a rotating glassy carbon disk electrode. We found that increases in the specific surface area and mean pore diameter increased the activity and that the latter was more effective than the former mainly due to the enhanced mass-transfer in the pores; the catalyst layer formed from activated carbon with the largest mean pore diameter was the most active. Unless pores excessively develop and lose connections between particles, a large pore diameter is therefore desired for the fuel cell electrodes.  相似文献   
94.
为了研究高压旋喷锚杆支护体系在黄土深基坑工程中的工作性状,选取西安某深基坑支护工程为研究对象,运用MIDAS/GTS软件对该支护体系进行了有限元数值模拟,并与二次注浆锚杆支护体系的模拟结果进行了对比分析。结果表明:两种基坑支护方式均可满足该基坑支护的技术要求,但采用高压旋喷锚杆支护时,需要锚杆的总长度为二次注浆锚杆长度的62%,且高压旋喷锚杆筋体可实现回收,降低了锚杆施工对周围土层的干扰,其在黄土地区高边坡及深基坑支护工程中有着广阔的应用前景。  相似文献   
95.
The alignment of information systems with the business goals of an organisation, although a topic of great importance, is not always properly valued or taken into consideration. In general, managers have different opinions to chief information officers (CIOs) in relation to IS, especially with regard to their importance and value to the business and also in terms of investment needs. Here, we discuss and study new approaches to methods and tools for assessing the relative importance of each information system to business, focusing on the financial sector including banks and insurance companies. We suggest the introduction of new key indicators for better decision support and to identify investment priorities, and present results regarding the relative importance of each process to support the business strategy. The primary goal for the inherent research project is to analyse the main problems and difficulties encountered by IS and IT managers, featuring different players and how they relate. The main contributions of this work are the CRUDi framework as a tool to improve alignment between business and IS strategies and the CRUDi survey and its results qualifying the financial sector's opinion regarding the relative importance of processes and investments.  相似文献   
96.
Spreadsheet programs can be found everywhere in organizations and they are used for a variety of purposes, including financial calculations, planning, data aggregation and decision making tasks. A number of research surveys have however shown that such programs are particularly prone to errors. Some reasons for the error-proneness of spreadsheets are that spreadsheets are developed by end users and that standard software quality assurance processes are mostly not applied. Correspondingly, during the last two decades, researchers have proposed a number of techniques and automated tools aimed at supporting the end user in the development of error-free spreadsheets. In this paper, we provide a review of the research literature and develop a classification of automated spreadsheet quality assurance (QA) approaches, which range from spreadsheet visualization, static analysis and quality reports, over testing and support to model-based spreadsheet development. Based on this review, we outline possible opportunities for future work in the area of automated spreadsheet QA.  相似文献   
97.
综述了近年来硅胶载体经甲基铝氧烷(MAO)化学处理后负载茂金属催化剂的一些研究进展,指出硅胶的化学活化是茂金属催化剂负载化的关键,单组分化学处理剂处理硅胶载体不能完全满足人们对负载型茂金属催化剂烯烃聚合的需求,采用含MAO的多组分化学处理剂化学活化硅胶后负载催化剂是该领域发展的趋势。  相似文献   
98.
TiN supported molybdenum sulfide catalysts showed much higher activity for cleavage of C-C bonds than oxide supported molybdenum sulfide catalysts, indicating the possibility of a new generation of supports for hydroprocessing catalysts.  相似文献   
99.
基于KPCA-PSO-SVM的径流预测研究   总被引:1,自引:0,他引:1  
为提高径流预测模型的准确性与稳定性,对KPCA-PSO-SVM的径流预测方法进行了研究。在分析径流影响因素的基础上,利用核主成分分析(KPCA)法对径流影响因子进行非线性特征提取,获得主成分作为支持向量机(SVM)的输入变量,建立了径流预测SVM模型,其中模型参数通过粒子群算法(PSO)进行优化。模型建立后,以新疆伊犁河雅马渡站中长期径流预测为例进行分析。预测分析结果表明,在拟合和检验阶段模型的平均相对误差分别为0.77%和7.64%,与其他预测模型比较,基于KPCA-PSO-SVM方法建立的径流预测模型有较好的预测和泛化能力,是一种行之有效的中长期径流预测方法。  相似文献   
100.
Revisiting the medical and social models of disability, this study adopted the integrated biopsychosocial approach to examine experiences of 25 mobility‐impaired respondents in Singapore with using mobile phones. We found that mobile phones provided respondents a greater degree of mobility, a sense of control, and opportunities to escape the stigma of disability, thus challenging the boundaries between the able‐bodied and the disabled. Mobile phone appropriation allowed the management of personal identities and social networks, leading to a sense of empowerment. However, mobile phone usage might act as a double‐edged sword for disabled people, creating mobile dependencies and a spatial narrowing of social connections. Theoretical and practical implications are discussed.  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