全文获取类型
收费全文 | 4701篇 |
免费 | 875篇 |
国内免费 | 129篇 |
专业分类
电工技术 | 157篇 |
综合类 | 252篇 |
化学工业 | 688篇 |
金属工艺 | 78篇 |
机械仪表 | 340篇 |
建筑科学 | 86篇 |
矿业工程 | 57篇 |
能源动力 | 72篇 |
轻工业 | 136篇 |
水利工程 | 20篇 |
石油天然气 | 21篇 |
武器工业 | 20篇 |
无线电 | 1336篇 |
一般工业技术 | 1388篇 |
冶金工业 | 25篇 |
原子能技术 | 7篇 |
自动化技术 | 1022篇 |
出版年
2024年 | 25篇 |
2023年 | 257篇 |
2022年 | 85篇 |
2021年 | 268篇 |
2020年 | 256篇 |
2019年 | 217篇 |
2018年 | 248篇 |
2017年 | 276篇 |
2016年 | 265篇 |
2015年 | 231篇 |
2014年 | 286篇 |
2013年 | 276篇 |
2012年 | 295篇 |
2011年 | 400篇 |
2010年 | 261篇 |
2009年 | 231篇 |
2008年 | 218篇 |
2007年 | 198篇 |
2006年 | 183篇 |
2005年 | 159篇 |
2004年 | 139篇 |
2003年 | 121篇 |
2002年 | 122篇 |
2001年 | 108篇 |
2000年 | 102篇 |
1999年 | 66篇 |
1998年 | 74篇 |
1997年 | 82篇 |
1996年 | 53篇 |
1995年 | 44篇 |
1994年 | 33篇 |
1993年 | 23篇 |
1992年 | 21篇 |
1991年 | 29篇 |
1990年 | 18篇 |
1989年 | 11篇 |
1988年 | 6篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有5705条查询结果,搜索用时 15 毫秒
91.
92.
为了提高硅基成像器件的紫外响应,本文通过对Alq3发光机理与光致发光特性的研究,用真空蒸镀的方法制备出了基于Alq3的有机金属薄膜.通过测量Alq3薄膜的透过率、光致发光光谱和激发光谱,发现Alq3薄膜在可见波段有很好的透过性,用紫外光激发会产生较强的绿光(中心波长位于510 nm),且激发光谱宽(250~425 nm).结论表明Alq3薄膜的发射光谱能够与传统硅基成像器件的响应光谱匹配,是一种符合实际要求的紫外增强薄膜. 相似文献
93.
94.
95.
96.
97.
New energy storage devices such as batteries and supercapacitors are widely used in various felds because of their
irreplaceable excellent characteristics. Because there are relatively few monitoring parameters and limited understanding of their operation, they present problems in accurately predicting their state and controlling operation, such
as state of charge, state of health, and early failure indicators. Poor monitoring can seriously afect the performance of
energy storage devices. Therefore, to maximize the efciency of new energy storage devices without damaging the
equipment, it is important to make full use of sensing systems to accurately monitor important parameters such as
voltage, current, temperature, and strain. These are highly related to their states. Hence, this paper reviews the sensing
methods and divides them into two categories: embedded and non-embedded sensors. A variety of measurement
methods used to measure the above parameters of various new energy storage devices such as batteries and supercapacitors are systematically summarized. The methods with diferent innovative points are listed, their advantages
and disadvantages are summarized, and the application of optical fber sensors is emphasized. Finally, the challenges
and prospects for these studies are described. The intent is to encourage researchers in relevant felds to study the
early warning of safety accidents from the root causes. 相似文献
98.
Qian Chen Junting Shen Diana Estevez Yanlin Chen Zihao Zhu Jun Yin Faxiang Qin 《Advanced functional materials》2023,33(33):2302545
3D printed graphene aerogels hold promise for flexible sensing fields due to their flexibility, low density, conductivity, and piezo-resistivity. However, low printing accuracy/fidelity and stochastic porous networks have hindered both sensing performance and device miniaturization. Here, printable graphene oxide (GO) inks are formulated through modulating oxygen functional groups, which allows printing of self-standing 3D graphene oxide aerogel microlattice (GOAL) with an ultra-high printing resolution of 70 µm. The reduced GOAL (RGOAL) is then stuck onto the adhesive tape as a facile and large-scale strategy to adapt their functionalities into target applications. Benefiting from the printing resolution of 70 µm, RGOAL tape shows better performance and data readability when used as micro sensors and robot e-skin. By adjusting the molecular structure of GO, the research realizes regulation of rheological properties of GO hydrogel and the 3D printing of lightweight and ultra-precision RGOAL, improves the sensing accuracy of graphene aerogel electronic devices and realizes the device miniaturization, expanding the application of graphene aerogel devices to a broader field such as micro robots, which is beyond the reach of previous reports. 相似文献
99.
Bio-Inspired Artificial Fast-Adaptive and Slow-Adaptive Mechanoreceptors With Synapse-Like Functions
Hung Quang Huynh Tran Quang Trung Atanu Bag Trung Dieu Do M. Junaid Sultan Miso Kim Nae-Eung Lee 《Advanced functional materials》2023,33(42):2303535
Development of artificial mechanoreceptors capable of sensing and pre-processing external mechanical stimuli is a crucial step toward constructing neuromorphic perception systems that can learn and store information. Here, bio-inspired artificial fast-adaptive (FA) and slow-adaptive (SA) mechanoreceptors with synapse-like functions are demonstrated for tactile perception. These mechanoreceptors integrate self-powered piezoelectric pressure sensors with synaptic electrolyte-gated field-effect transistors (EGFETs) featuring a reduced graphene oxide channel. The FA pressure sensor is based on a piezoelectric poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) thin film, while the SA pressure sensor is enabled by a piezoelectric ionogel with the piezoelectric-ionic coupling effect based on P(VDF-TrFE) and an ionic liquid. Changes in post-synaptic current are achieved through the synaptic effect of the EGFET by regulating the amplitude, number, duration, and frequency of tactile stimuli (pre-synaptic pulses). These devices have great potential to serve as artificial biological mechanoreceptors for future artificial neuromorphic perception systems. 相似文献
100.
Min Seong Kim Yung Lee Junseong Ahn Seonggi Kim Kyungnam Kang Hyuneui Lim Byeong-Soo Bae Inkyu Park 《Advanced functional materials》2023,33(3):2208792
Conventional elastomeric polymers used as substrates for wearable platforms have large positive Poisson's ratios (≈0.5) that cause a deformation mismatch with human skin that is multidirectionally elongated under bending of joints. This causes practical problems in elastomer-based wearable devices, such as delamination and detachment, leading to poorly reliable functionality. To overcome this issue, auxetic-structured mechanical reinforcement with glass fibers is applied to the elastomeric film, resulting in a negative Poisson's ratio (NPR), which is a skin-like stretchable substrate (SLSS). Several parameters for determining the materials and geometrical dimensions of the auxetic-structured reinforcing fillers are considered to maximize the NPR. Based on numerical simulation and digital image correlation analysis, the deformation tendencies and strain distribution of the SLSS are investigated and compared with those of the pristine elastomeric substrate. Owing to the strain-localization characteristics, an independent strain-pressure sensing system is fabricated using SLSS with a Ag-based elastomeric ink and a carbon nanotube-based force-sensitive resistor. Finally, it is demonstrated that the SLSS-based sensor platform can be applied as a wearable device to monitor the physical burden on the wrist in real time. 相似文献