全文获取类型
收费全文 | 189436篇 |
免费 | 18064篇 |
国内免费 | 9908篇 |
专业分类
电工技术 | 12255篇 |
技术理论 | 13篇 |
综合类 | 15566篇 |
化学工业 | 30428篇 |
金属工艺 | 10437篇 |
机械仪表 | 11801篇 |
建筑科学 | 15448篇 |
矿业工程 | 5445篇 |
能源动力 | 4944篇 |
轻工业 | 18006篇 |
水利工程 | 4012篇 |
石油天然气 | 8829篇 |
武器工业 | 1860篇 |
无线电 | 21352篇 |
一般工业技术 | 20620篇 |
冶金工业 | 8206篇 |
原子能技术 | 2278篇 |
自动化技术 | 25908篇 |
出版年
2024年 | 927篇 |
2023年 | 3235篇 |
2022年 | 6257篇 |
2021年 | 8028篇 |
2020年 | 6264篇 |
2019年 | 5002篇 |
2018年 | 5483篇 |
2017年 | 6263篇 |
2016年 | 5621篇 |
2015年 | 7881篇 |
2014年 | 10304篇 |
2013年 | 11913篇 |
2012年 | 13587篇 |
2011年 | 14360篇 |
2010年 | 13151篇 |
2009年 | 12359篇 |
2008年 | 12200篇 |
2007年 | 11749篇 |
2006年 | 11036篇 |
2005年 | 9144篇 |
2004年 | 6450篇 |
2003年 | 5149篇 |
2002年 | 5003篇 |
2001年 | 4268篇 |
2000年 | 3882篇 |
1999年 | 3544篇 |
1998年 | 2688篇 |
1997年 | 2210篇 |
1996年 | 2103篇 |
1995年 | 1627篇 |
1994年 | 1396篇 |
1993年 | 1004篇 |
1992年 | 766篇 |
1991年 | 614篇 |
1990年 | 445篇 |
1989年 | 380篇 |
1988年 | 337篇 |
1987年 | 201篇 |
1986年 | 145篇 |
1985年 | 106篇 |
1984年 | 66篇 |
1983年 | 52篇 |
1982年 | 51篇 |
1981年 | 36篇 |
1980年 | 50篇 |
1979年 | 22篇 |
1978年 | 3篇 |
1976年 | 6篇 |
1959年 | 14篇 |
1951年 | 17篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
The application of deep learning in the field of object detection has
experienced much progress. However, due to the domain shift problem, applying an
off-the-shelf detector to another domain leads to a significant performance drop. A
large number of ground truth labels are required when using another domain to train
models, demanding a large amount of human and financial resources. In order to avoid
excessive resource requirements and performance drop caused by domain shift, this
paper proposes a new domain adaptive approach to cross-domain vehicle detection. Our
approach improves the cross-domain vehicle detection model from image space and
feature space. We employ objectives of the generative adversarial network and cycle
consistency loss for image style transfer in image space. For feature space, we align
feature distributions between the source domain and the target domain to improve the
detection accuracy. Experiments are carried out using the method with two different
datasets, proving that this technique effectively improves the accuracy of vehicle
detection in the target domain. 相似文献
102.
Journal of Mechanical Science and Technology - The idea of integral calculus is used in traditional milling force prediction methods. In the traditional method, the milling cutter is divided into... 相似文献
103.
104.
The red grape berry pigments, anthocyanins, were characterized in the early 20th century, but investigations of wine pigments were stymied during that era. The question of their identity was a major challenge for wine chemists. A number of techniques showed that the pigments were polymeric in nature. Some structures were postulated by mid-century based on reactions between anthocyanins and condensed tannin, and later postulated wine pigments were observed in model reactions. Some related compounds were then observed in wine. By the end of the 20th century, the ionization of non-volatiles for mass spectrometry opened the door to these compounds. In addition, a new class of compounds was observed, the pyranoanthocyanins, a product of fermentation and aging metabolites with anthocyanins. These compounds possess the pigment stability to SO2 and pH change that is characteristic of aged red wine. Aging experiments show a dynamic situation with shifts in the population of pigment classes over time. The very large number of diverse pigments explains why it has been so difficult to answer the century-old question of the structure of wine pigments. Our current understanding is founded on the use of mass spectral analysis using electrospray and related ionization techniques over the last 25 years. Future progress will rely on more sophisticated analysis of this very complex mixture of substances. © 2019 Society of Chemical Industry 相似文献
105.
106.
Wang Lu-di Zhou Wei Xing Ying Liu Na Movahedipour Mahmood Zhou Xiao-guang 《浙江大学学报:C卷英文版》2019,20(3):405-413
Frontiers of Information Technology & Electronic Engineering - Reconstruction of a 12-lead electrocardiogram (ECG) from a serial 3-lead ECG has been researched in the past to satisfy the need... 相似文献
107.
108.
109.
Neural Computing and Applications - More and more enterprises hope to achieve cooperation and win–win. However, many companies often have problems such as insufficient partner credit, which... 相似文献
110.
This work is concerned with the prediction of visual colour difference between pairs of palettes. In this study, the palettes contained five colours arranged in a horizontal row. A total of 95 pairs of palettes were rated for visual difference by 20 participants. The colour difference between the palettes was predicted using two algorithms, each based on one of six colour-difference formulae. The best performance (r2 = 0.86 and STRESS = 16.9) was obtained using the minimum colour-difference algorithm (MICDM) using the CIEDE2000 equation with a lightness weighing of 2. There was some evidence that the order (or arrangement) of the colours in the palettes was a factor affecting the visual colour differences although the MICDM algorithm does not take order into account. Application of this algorithm is intended for digital design workflows where colour palettes are generated automatically using machine learning and for comparing palettes obtained from psychophysical studies to explore, for example, the effect of culture, age, or gender on colour associations. 相似文献