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   24240篇
  免费   2038篇
  国内免费   885篇
电工技术   1176篇
技术理论   5篇
综合类   1350篇
化学工业   4358篇
金属工艺   1619篇
机械仪表   1462篇
建筑科学   1813篇
矿业工程   688篇
能源动力   784篇
轻工业   1606篇
水利工程   373篇
石油天然气   1700篇
武器工业   154篇
无线电   2457篇
一般工业技术   3047篇
冶金工业   1394篇
原子能技术   253篇
自动化技术   2924篇
  2024年   125篇
  2023年   489篇
  2022年   730篇
  2021年   1013篇
  2020年   835篇
  2019年   706篇
  2018年   817篇
  2017年   837篇
  2016年   722篇
  2015年   973篇
  2014年   1155篇
  2013年   1563篇
  2012年   1506篇
  2011年   1590篇
  2010年   1387篇
  2009年   1320篇
  2008年   1268篇
  2007年   1228篇
  2006年   1296篇
  2005年   1127篇
  2004年   689篇
  2003年   650篇
  2002年   591篇
  2001年   477篇
  2000年   553篇
  1999年   654篇
  1998年   553篇
  1997年   418篇
  1996年   399篇
  1995年   332篇
  1994年   274篇
  1993年   193篇
  1992年   155篇
  1991年   109篇
  1990年   89篇
  1989年   49篇
  1988年   67篇
  1987年   42篇
  1986年   29篇
  1985年   32篇
  1984年   28篇
  1983年   16篇
  1982年   12篇
  1981年   9篇
  1980年   13篇
  1979年   9篇
  1978年   4篇
  1974年   3篇
  1959年   2篇
  1958年   2篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
Internet环境下漫游系统中的视点控制技术   总被引:3,自引:0,他引:3  
在研究了基于Web的虚拟真实漫游系统的应用前景的基础上,利用VRML的网络特性以及内置接口语言Java和JavaScript,对系统中的视点绑定、视点动画交互等关键技术进行了详细的阐述,并给出了相应的VRML程序。  相似文献   
73.
74.
天津钢铁有限公司引进了瑞士Concast公司6机6流方、圆坯连铸机及相关技术,文章简要介绍了Concast连铸机的自动控制系统的特点和功能。  相似文献   
75.
介绍了用自顶向下的结构化方法进行科研项目管理信息系统设计的过程。该系统的应用节省了大量人力、物力和财力,提高了企业科研项目管理水平。  相似文献   
76.
Miniaturized hexagonal stepped-impedance resonators and their applications to bandpass filters are presented. Based on the odd- and even-mode equivalent circuits, the resonance characteristics of these resonators are investigated. A series of circuit configurations, including the third-order Chebyshev, trisection, and fifth-order cascaded trisection filters, are constructed by the proposed resonators. These filters are very compact and have good stopband responses. Measured results validate the analysis and theoretical prediction with good agreement.  相似文献   
77.
基础锚栓预埋加固方案   总被引:1,自引:0,他引:1  
结合工程实例 ,介绍轻钢结构系统基础锚栓预埋、加固解决方案 ,并介绍了加固系统的制作及使用方法 ,可供工程人员参考  相似文献   
78.
In this work, microcrystalline cellulose (MCC) was activated with ultrasonic waves. The influences of ultrasonic treatment on the changes of supramolecular structures and morphology structure were studied by WAXS and SEM. The accessibility of the MCC was characterized by water retention value (WRV) and specific surficial area. The influence of ultrasonic treatment on the reactivity of MCC was investigated through the reaction of MCC being oxidized into 2,3‐diadehyde cellulose (DAC) by periodate sodium. The mechanism of the reactivity change of ultrasonically treated MCC was examined. The results showed that the degree of crystallinity of MCC decreased and the degree of polymerization showed little change after treatment with ultrasonic waves. The morphologial variation of the treated MCC was significant when compared with the untreated MCC, which contribute to the improvement of accessibility. The aldehyde content of DAC prepared from ultrasonically treated MCC was improved from 64.19 to 85.00%, indicating that the regioselective oxidation reactivity of MCC was significantly improved. The aldehyde content was found to first increase with time of ultrasonic treatment to a point, and then decrease as time progressed. In addition, the aldehyde content was found to increase with an increase in ultrasonic power. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008  相似文献   
79.
A simple method has been devised for immobilization of acetylcholinesterase (AChE) covalent bonding to a multiwall carbon nanotube (MWNT)-cross-linked cellulose acetate composite on a screen-printed carbon electrode (SPCE) and a sensitive and disposable amperometric sensor for rapid determination of carbaryl pesticide is proposed. The immobilized enzyme was preserved on this film because of the excellent biocompatibility and non-toxicity of cellulose acetate. Based on the inherent conductive properties of the MWNT, the immobilized AChE had greater affinity for ATCl and excellent catalytic effect in the hydrolysis of ATCl. MWNT improved the interface enzymatic hydrolysis reaction and increased the amperometric response of the sensor. Under optimum conditions, the inhibition of carbaryl on AChE increased linearly with the increasing concentration of carbaryl in two ranges, from 0.01 to 0.5 μg mL−1 and from 2 to 20 μg mL−1, with the correlation coefficients of 0.9985 and 0.9977, respectively. The detection limit was 0.004 μg mL−1 taken as the concentration equivalent to 10% decrease in signal. The sensor showed acceptable stability, accuracy and could be fabricated in batches, thus it is economic and portable. This type of disposable enzyme-based amperometric sensor has extensive application potential in environmental monitoring of pesticides.  相似文献   
80.
A new organic‐solvent‐free water‐phase suspension method was used to synthesize partially epoxidized high trans‐1,4‐polyisoprene (TPI) to improve its properties, including oil resistance and wet‐skid resistance. The epoxidation was conducted in an aqueous peracetic acid solution and on the TPI granules prepared by a bulk precipitation method with supported titanium catalyst. The effects of the synthesis conditions, including reaction temperature, reaction time, and pH value, on the epoxy content were investigated. Epoxidized trans‐1,4‐polyisoprene (ETPI) with epoxy contents between 10 and 80% were obtained within 4 h. Both the amorphous and crystalline regions of TPI were epoxidized. The crystallization properties decreased with increasing epoxy content. ETPIs possessed lower mechanical properties than TPI but could be enhanced by vulcanization. The oil resistance and wet‐skid resistance were significantly improved after epoxidation. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008  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