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   7682篇
  免费   358篇
  国内免费   48篇
电工技术   213篇
综合类   20篇
化学工业   1644篇
金属工艺   160篇
机械仪表   187篇
建筑科学   237篇
矿业工程   8篇
能源动力   515篇
轻工业   758篇
水利工程   89篇
石油天然气   154篇
武器工业   4篇
无线电   952篇
一般工业技术   1355篇
冶金工业   456篇
原子能技术   77篇
自动化技术   1259篇
  2024年   17篇
  2023年   178篇
  2022年   424篇
  2021年   526篇
  2020年   374篇
  2019年   377篇
  2018年   484篇
  2017年   337篇
  2016年   383篇
  2015年   235篇
  2014年   363篇
  2013年   596篇
  2012年   391篇
  2011年   444篇
  2010年   284篇
  2009年   241篇
  2008年   227篇
  2007年   207篇
  2006年   173篇
  2005年   154篇
  2004年   124篇
  2003年   103篇
  2002年   118篇
  2001年   63篇
  2000年   65篇
  1999年   76篇
  1998年   123篇
  1997年   108篇
  1996年   71篇
  1995年   78篇
  1994年   51篇
  1993年   51篇
  1992年   41篇
  1991年   23篇
  1990年   28篇
  1989年   42篇
  1988年   46篇
  1987年   29篇
  1986年   28篇
  1985年   42篇
  1984年   49篇
  1983年   41篇
  1982年   26篇
  1981年   21篇
  1980年   28篇
  1979年   23篇
  1978年   18篇
  1977年   21篇
  1976年   30篇
  1974年   16篇
排序方式: 共有8088条查询结果,搜索用时 15 毫秒
991.
Information extraction plays a vital role in natural language processing, to extract named entities and events from unstructured data. Due to the exponential data growth in the agricultural sector, extracting significant information has become a challenging task. Though existing deep learning-based techniques have been applied in smart agriculture for crop cultivation, crop disease detection, weed removal, and yield production, still it is difficult to find the semantics between extracted information due to unswerving effects of weather, soil, pest, and fertilizer data. This paper consists of two parts. An initial phase, which proposes a data preprocessing technique for removal of ambiguity in input corpora, and the second phase proposes a novel deep learning-based long short-term memory with rectification in Adam optimizer and multilayer perceptron to find agricultural-based named entity recognition, events, and relations between them. The proposed algorithm has been trained and tested on four input corpora i.e., agriculture, weather, soil, and pest & fertilizers. The experimental results have been compared with existing techniques and it was observed that the proposed algorithm outperforms Weighted-SOM, LSTM+RAO, PLR-DBN, KNN, and Naïve Bayes on standard parameters like accuracy, sensitivity, and specificity.  相似文献   
992.
Cyberattacks are developing gradually sophisticated, requiring effective intrusion detection systems (IDSs) for monitoring computer resources and creating reports on anomalous or suspicious actions. With the popularity of Internet of Things (IoT) technology, the security of IoT networks is developing a vital problem. Because of the huge number and varied kinds of IoT devices, it can be challenging task for protecting the IoT framework utilizing a typical IDS. The typical IDSs have their restrictions once executed to IoT networks because of resource constraints and complexity. Therefore, this paper presents a new Blockchain Assisted Intrusion Detection System using Differential Flower Pollination with Deep Learning (BAIDS-DFPDL) model in IoT Environment. The presented BAIDS-DFPDL model mainly focuses on the identification and classification of intrusions in the IoT environment. To accomplish this, the presented BAIDS-DFPDL model follows blockchain (BC) technology for effective and secure data transmission among the agents. Besides, the presented BAIDS-DFPDL model designs Differential Flower Pollination based feature selection (DFPFS) technique to elect features. Finally, sailfish optimization (SFO) with Restricted Boltzmann Machine (RBM) model is applied for effectual recognition of intrusions. The simulation results on benchmark dataset exhibit the enhanced performance of the BAIDS-DFPDL model over other models on the recognition of intrusions.  相似文献   
993.
Journal of Superconductivity and Novel Magnetism - In this work, full potential linearized augmented plane wave (FP-LAPW) method is used to determine the electronic, magnetic, and mechanical...  相似文献   
994.
Journal of Superconductivity and Novel Magnetism - This work aims to examine the magnetocaloric properties of the Perovskite GdCuO3, such as the total magnetization, the susceptibility, and the...  相似文献   
995.
International Journal of Thermophysics - The paper describes the metrological characterization of the highly stable Pt-40%Rh/Pt-6%Rh thermocouples to determine their reference function in the...  相似文献   
996.
Journal of Materials Science: Materials in Electronics - The effects of the substituent in p-substituent-benzylidenemalononitrile small molecules have been investigated. We found that the...  相似文献   
997.
Journal of Materials Science: Materials in Electronics - Lanthanum strontium manganite (La0.4Sr0.6MnO3) of perovskite structure was successfully produced by mechanochemical synthesis method....  相似文献   
998.
Applied Composite Materials - Sheet molding compounds (SMCs) are increasingly used in high-volume automotive applications for lightweighting and as a cost-neutral or low-cost solution to incumbent...  相似文献   
999.
Journal of Materials Science: Materials in Electronics - Herein, Cu ions surface-doped Dy2O3 photocatalyst (Cu–Dy2O3) is synthesized utilizing hydrothermal technique to degrade methyl violet...  相似文献   
1000.
Journal of Materials Science: Materials in Electronics - Novel zinc borate glass doped with mixed rare-earth ions such as erbium (Er3+) and ytterbium (Yb3+) ions were prepared by conventional melt...  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