全文获取类型
收费全文 | 2364篇 |
免费 | 214篇 |
国内免费 | 127篇 |
专业分类
电工技术 | 30篇 |
综合类 | 238篇 |
化学工业 | 210篇 |
金属工艺 | 36篇 |
机械仪表 | 83篇 |
建筑科学 | 156篇 |
矿业工程 | 40篇 |
能源动力 | 42篇 |
轻工业 | 300篇 |
水利工程 | 17篇 |
石油天然气 | 14篇 |
武器工业 | 5篇 |
无线电 | 116篇 |
一般工业技术 | 139篇 |
冶金工业 | 48篇 |
原子能技术 | 2篇 |
自动化技术 | 1229篇 |
出版年
2024年 | 1篇 |
2023年 | 27篇 |
2022年 | 39篇 |
2021年 | 39篇 |
2020年 | 72篇 |
2019年 | 47篇 |
2018年 | 28篇 |
2017年 | 58篇 |
2016年 | 72篇 |
2015年 | 64篇 |
2014年 | 164篇 |
2013年 | 104篇 |
2012年 | 148篇 |
2011年 | 183篇 |
2010年 | 133篇 |
2009年 | 157篇 |
2008年 | 139篇 |
2007年 | 181篇 |
2006年 | 148篇 |
2005年 | 124篇 |
2004年 | 128篇 |
2003年 | 111篇 |
2002年 | 104篇 |
2001年 | 89篇 |
2000年 | 66篇 |
1999年 | 43篇 |
1998年 | 47篇 |
1997年 | 33篇 |
1996年 | 25篇 |
1995年 | 31篇 |
1994年 | 27篇 |
1993年 | 23篇 |
1992年 | 13篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 9篇 |
1988年 | 6篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 3篇 |
排序方式: 共有2705条查询结果,搜索用时 281 毫秒
1.
《Ceramics International》2022,48(8):10852-10861
Carbon cloth was used as a flexible substrate for bismuth telluride (Bi2Te3) particles to provide flexibility and improve the overall thermoelectric performance. Bi2Te3 on carbon cloth (Bi2Te3/CC) was synthesized via a hydrothermal reaction with various reaction times. After over 12 h, the Bi2Te3 particles showed a clear hexagonal shape and were evenly adhered to the carbon cloth. Selenium (Se) atoms were doped into the Bi2Te3 structure to improve its thermoelectric performance. The electrical conductivity increased with increasing Se-dopant content until 40% Se was added. Moreover, the maximum power factor was 1300 μW/mK2 at 473 K for the 30% Se-doped sample. The carbon cloth substrate maintained its electrical resistivity and flexibility after 2000 bending cycles. A flexible thermoelectric generator (TEG) fabricated using the five pairs of 30% Se-doped sample showed an open-circuit voltage of 17.4 mV and maximum power output of 850 nW at temperature difference ΔT = 30 K. This work offers a promising approach for providing flexibility and improving the thermoelectric performance of inorganic thermoelectric materials for wearable device applications using flexible carbon cloth substrate for low temperature range application. 相似文献
2.
3.
This paper introduces a simple method for simulating highly anisotropic elastoplastic material behaviors like the dissolution of fibrous phenomena (splintering wood, shredding bales of hay) and materials composed of large numbers of irregularly-shaped bodies (piles of twigs, pencils, or cards). We introduce a simple transformation of the anisotropic problem into an equivalent isotropic one, and we solve this new “fictitious” isotropic problem using an existing simulator based on the material point method. Our approach results in minimal changes to existing simulators, and it allows us to re-use popular isotropic plasticity models like the Drucker-Prager yield criterion instead of inventing new anisotropic plasticity models for every phenomenon we wish to simulate. 相似文献
4.
This paper presents a spectral approach to compress dynamic animation consisting of a sequence of homeomor-phic manifold meshes. Our new approach directly compresses the field of deformation gradient d... 相似文献
5.
Simon Alexanderson Gustav Eje Henter Taras Kucherenko Jonas Beskow 《Computer Graphics Forum》2020,39(2):487-496
Automatic synthesis of realistic gestures promises to transform the fields of animation, avatars and communicative agents. In off-line applications, novel tools can alter the role of an animator to that of a director, who provides only high-level input for the desired animation; a learned network then translates these instructions into an appropriate sequence of body poses. In interactive scenarios, systems for generating natural animations on the fly are key to achieving believable and relatable characters. In this paper we address some of the core issues towards these ends. By adapting a deep learning-based motion synthesis method called MoGlow, we propose a new generative model for generating state-of-the-art realistic speech-driven gesticulation. Owing to the probabilistic nature of the approach, our model can produce a battery of different, yet plausible, gestures given the same input speech signal. Just like humans, this gives a rich natural variation of motion. We additionally demonstrate the ability to exert directorial control over the output style, such as gesture level, speed, symmetry and spacial extent. Such control can be leveraged to convey a desired character personality or mood. We achieve all this without any manual annotation of the data. User studies evaluating upper-body gesticulation confirm that the generated motions are natural and well match the input speech. Our method scores above all prior systems and baselines on these measures, and comes close to the ratings of the original recorded motions. We furthermore find that we can accurately control gesticulation styles without unnecessarily compromising perceived naturalness. Finally, we also demonstrate an application of the same method to full-body gesticulation, including the synthesis of stepping motion and stance. 相似文献
6.
Beverly Ayling-Smith 《Textile》2019,17(3):296-311
This article explores how, following bereavement, textile artwork may be able to make a connection with the viewer and allow a progression of their work of mourning. It takes an interdisciplinary approach, drawing from the literature of psychoanalytical theory, affectivity, and textile thinking to understand the importance of cloth as artwork in the grieving process. The article draws on the practice-based textile research of the author which, together with responses to the artworks made, discusses the way viewers can make an emotional investment in textile artwork and considers the concept of exhibitionary affect to increase the emotional connection of the viewer to the work. 相似文献
7.
介绍了玻璃纤维电子布织造时边部经纱松弛现象及对电子布质量的影响,分不同的工序剖析了玻璃纤维电子布织造时边纱松弛的主要原因,并针对这些原因提出了相对应的应对措施,为解决电子布生产过程中的边纱松弛提供了相关的技术解决方案。 相似文献
8.
9.
论外墙外保温工程施工 总被引:1,自引:0,他引:1
介绍了隔热用聚苯乙烯泡沫板的特点及使用范围,从材料性能及要求、工艺原理及流程、作业条件几方面介绍了外墙外保温的两种施工技术,并对两种保温技术进行了效益分析,以达到建筑节能的目的。 相似文献
10.
碳纤维材料加固混凝土结构是一种新型结构加固方法。某商场由于电器故障引起火灾,导致该商场框架梁构件受到一定程度的损伤,危及结构安全,经分析比较多种加固方案,最终采用粘贴碳纤维布对该框架梁进行加固。 相似文献