全文获取类型
收费全文 | 117950篇 |
免费 | 12233篇 |
国内免费 | 7320篇 |
专业分类
电工技术 | 8884篇 |
技术理论 | 2篇 |
综合类 | 10618篇 |
化学工业 | 17915篇 |
金属工艺 | 6588篇 |
机械仪表 | 7539篇 |
建筑科学 | 8770篇 |
矿业工程 | 3286篇 |
能源动力 | 3298篇 |
轻工业 | 9861篇 |
水利工程 | 2735篇 |
石油天然气 | 5082篇 |
武器工业 | 1186篇 |
无线电 | 14476篇 |
一般工业技术 | 12762篇 |
冶金工业 | 4760篇 |
原子能技术 | 1437篇 |
自动化技术 | 18304篇 |
出版年
2024年 | 599篇 |
2023年 | 2042篇 |
2022年 | 3964篇 |
2021年 | 5497篇 |
2020年 | 3997篇 |
2019年 | 3205篇 |
2018年 | 3349篇 |
2017年 | 3756篇 |
2016年 | 3533篇 |
2015年 | 4860篇 |
2014年 | 6175篇 |
2013年 | 7252篇 |
2012年 | 8487篇 |
2011年 | 8921篇 |
2010年 | 8142篇 |
2009年 | 7879篇 |
2008年 | 7770篇 |
2007年 | 7277篇 |
2006年 | 6886篇 |
2005年 | 5887篇 |
2004年 | 4441篇 |
2003年 | 3810篇 |
2002年 | 4281篇 |
2001年 | 3704篇 |
2000年 | 2690篇 |
1999年 | 2035篇 |
1998年 | 1325篇 |
1997年 | 1110篇 |
1996年 | 1002篇 |
1995年 | 853篇 |
1994年 | 650篇 |
1993年 | 452篇 |
1992年 | 366篇 |
1991年 | 280篇 |
1990年 | 226篇 |
1989年 | 149篇 |
1988年 | 139篇 |
1987年 | 102篇 |
1986年 | 64篇 |
1985年 | 63篇 |
1984年 | 50篇 |
1983年 | 33篇 |
1982年 | 30篇 |
1981年 | 24篇 |
1980年 | 29篇 |
1979年 | 25篇 |
1977年 | 13篇 |
1976年 | 15篇 |
1959年 | 14篇 |
1951年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Zhongkai Zhao Yohanes A. Situmorang Ping An Nichaboon Chaihad Jing Wang Xiaogang Hao Guangwen Xu Abuliti Abudula Guoqing Guan 《化学工程与技术》2020,43(4):625-640
In the future, hydrogen will be an important energy carrier and industrial raw material. Catalytic steam reforming of bio-oils is a promising and economically viable technology for hydrogen production. However, during the reforming process, the catalysts are rapidly deactivated due to coke formation and sintering. Thus, maintaining the activity and stability of catalysts is the key issue in this process. Optimized operation conditions could extend the catalyst lifetime by affecting the coke morphology or promoting coke gasification. This article summarizes the recent developments in the field of catalytic steam reforming of bio-oils, focusing on the operation conditions, the properties of the catalysts, and the effects of the catalyst supports. The expected insights into the catalytic steam reforming of bio-oils will provide further guidance for hydrogen production from bio-oils. 相似文献
2.
3.
4.
5.
6.
7.
申浩 《苏州科技学院学报(工程技术版)》2015,(2):61-65
解释了跨界借鉴的含义,并阐述了其在建筑立面创新设计中运用的可能性和积极意义。通过案例分析,提出建筑立面跨界借鉴的内容和方式。 相似文献
8.
9.
Process object is the instance of process. Vertexes and edges are in the graph of process object. There are different types of the object itself and the associations between object. For the large-scale data, there are many changes reflected. Recently, how to find appropriate real-time data for process object becomes a hot research topic. Data sampling is a kind of finding c hanges o f p rocess o bjects. There i s r equirements f or s ampling to be adaptive to underlying distribution of data stream. In this paper, we have proposed a adaptive data sampling mechanism to find a ppropriate d ata t o m odeling. F irst o f all, we use concept drift to make the partition of the life cycle of process object. Then, entity community detection is proposed to find changes. Finally, we propose stream-based real-time optimization of data sampling. Contributions of this paper are concept drift, community detection, and stream-based real-time computing. Experiments show the effectiveness and feasibility of our proposed adaptive data sampling mechanism for process object. 相似文献
10.
In the field of images and imaging, super-resolution (SR) reconstruction of images is a technique that converts one or more low-resolution (LR) images into a highresolution (HR) image. The classical two types of SR methods are mainly based on applying a single image or multiple images captured by a single camera. Microarray camera has the characteristics of small size, multi views, and the possibility of applying to portable devices. It has become a research hotspot in image processing. In this paper, we propose a SR reconstruction of images based on a microarray camera for sharpening and registration processing of array images. The array images are interpolated to obtain a HR image initially followed by a convolution neural network (CNN) procedure for enhancement. The convolution layers of our convolution neural network are 3×3 or 1×1 layers, of which the 1×1 layers are used to improve the network performance particularly. A bottleneck structure is applied to reduce the parameter numbers of the nonlinear mapping and to improve the nonlinear capability of the whole network. Finally, we use a 3×3 deconvolution layer to significantly reduce the number of parameters compared to the deconvolution layer of FSRCNN-s. The experiments show that the proposed method can not only ameliorate effectively the texture quality of the target image based on the array images information, but also further enhance the quality of the initial high resolution image by the improved CNN. 相似文献