全文获取类型
收费全文 | 128076篇 |
免费 | 12547篇 |
国内免费 | 7931篇 |
专业分类
电工技术 | 9174篇 |
技术理论 | 9篇 |
综合类 | 10179篇 |
化学工业 | 18951篇 |
金属工艺 | 8234篇 |
机械仪表 | 8780篇 |
建筑科学 | 10383篇 |
矿业工程 | 4058篇 |
能源动力 | 3870篇 |
轻工业 | 8736篇 |
水利工程 | 3065篇 |
石油天然气 | 6638篇 |
武器工业 | 1442篇 |
无线电 | 15226篇 |
一般工业技术 | 13954篇 |
冶金工业 | 5393篇 |
原子能技术 | 1911篇 |
自动化技术 | 18551篇 |
出版年
2024年 | 542篇 |
2023年 | 1756篇 |
2022年 | 3390篇 |
2021年 | 4901篇 |
2020年 | 3666篇 |
2019年 | 3067篇 |
2018年 | 3360篇 |
2017年 | 3898篇 |
2016年 | 3722篇 |
2015年 | 5211篇 |
2014年 | 6734篇 |
2013年 | 7878篇 |
2012年 | 9122篇 |
2011年 | 10120篇 |
2010年 | 9417篇 |
2009年 | 9040篇 |
2008年 | 9026篇 |
2007年 | 8609篇 |
2006年 | 8135篇 |
2005年 | 6626篇 |
2004年 | 4915篇 |
2003年 | 4190篇 |
2002年 | 4169篇 |
2001年 | 3665篇 |
2000年 | 2869篇 |
1999年 | 2347篇 |
1998年 | 1605篇 |
1997年 | 1317篇 |
1996年 | 1119篇 |
1995年 | 928篇 |
1994年 | 755篇 |
1993年 | 560篇 |
1992年 | 410篇 |
1991年 | 313篇 |
1990年 | 235篇 |
1989年 | 214篇 |
1988年 | 140篇 |
1987年 | 107篇 |
1986年 | 107篇 |
1985年 | 44篇 |
1984年 | 49篇 |
1983年 | 53篇 |
1982年 | 38篇 |
1981年 | 38篇 |
1980年 | 23篇 |
1979年 | 20篇 |
1977年 | 12篇 |
1976年 | 16篇 |
1959年 | 18篇 |
1951年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
针对目前集成电路版图分析与设计课程存在教学方法老化、教学模式形式化等问题,本文以OBE-CDIO教育理念为指导,对”集成电路版图分析与设计”课程的课程教学模式、课程设计、项目式教学方式和课程考核方式等方面的改革进行有益的探索与实践。将工程教学认证中对学生的专业毕业要求作为制定教学目标的依据,将BB网络平台、ISO9001等现代化教学资源和质量标准融入课堂教学,采用OBE-CDIO能力教学理念指导课程设计,实现教学环节与考核环节的科学化与多元化,通过引入课程思政激发学生学习热情,树立社会主义核心价值观,全面地培养学生的综合版图分析与设计能力和素养。 相似文献
22.
Nengbing Long Yanqing Fu Tianxiang Xu Dashuang Ding Shaoqian Zhang Shengzhi Sun Shiliang Kang Tiefeng Xu Shixun Dai Qiuhua Nie Changgui Lin 《Journal of the European Ceramic Society》2021,41(8):4584-4589
The confinement of CsPbX3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) in a stabilized inorganic glass matrix is a new strategy for improving their long-term stability and promoting their applications in the optoelectronic field. Here, in situ nanocrystallization strategy is developed to precipitate CsPbBr3?xIx NCs with arbitrary I/Br ratio among an elaborately designed GeS2–Sb2S3-based chalcogenide glass matrix. Spherical CsPbBr3?xIx NCs are homogeneously distributed in the glass matrix after thermal treatment. The photoluminescence (PL) spectra show that the emission peaks of CsPbBr3?xIx NCs can be tuned from 570 nm to 722 nm with the replacement of Br by I. The fs transient absorption (TA) spectra reveal that there exists some structural defects in the NCs, leading to short PL decay life. This work would shed light on confining CsPbX3 NCs into glassy matrices, facilitating their future applications in photoelectronic fields. 相似文献
23.
24.
Jun Dong Cho Luis Cavazos Quero Jorge Iranzo Bartolom Do Won Lee Uran Oh Inae Lee 《Color research and application》2021,46(1):103-116
A recent development in tactile technology enables an improvement in the appreciation of the visual arts for people with visual impairment (PVI). The tactile sense, in conjunction with, or a possibly as an alternative to, the auditory sense, would allow PVIs to approach artwork in a more self‐driven and engaging way that would be difficult to achieve with just an auditory stimulus. Tactile colour pictograms (TCPs), which are raised geometric patterns, are ideographic characters that are designed to enable PVIs to identify colours and interpret information by touch. In this article, three TCPs are introduced to code colours in the Munsell colour system. Each colour pattern consists of a basic cell size of 10 mm × 10 mm to represent the patterns consistently in terms of regular shape. Each TCP consists of basic geometric patterns that are combined to create primary, secondary, and tertiary colour pictograms of shapes indicating colour hue, intensity and lightness. Each TCP represents 29 colours including six hues; they were then further expanded to represent 53 colours. Two of them did not increase the cell size, the other increased the cell size 1.5 times for some colours, such as yellow‐orange, yellow, blue, and blue‐purple. Our proposed TCPs use a slightly larger cell size compared to most tactile patterns currently used to indicate colour, but code for more colours. With user experience and identification tests, conducted with 23 visually impaired adults, the effectiveness of the TCPs suggests that they were helpful for the participants. 相似文献
25.
Juan Ding Yong He Shenhe Fu Xiangsheng Xie Haowen Liang Jianying Zhou 《Journal of the Society for Information Display》2022,30(2):159-167
Illumination is essential for modern life as colorful world is perceived by human visionary system. Display technology has been developing rapidly in recent decades, and the basic principle is related to the way that the image is illuminated and light is emanated. Traditional illumination is provided by different types of light sources, and the display image is visible in large viewing space until the emanating light decays to zero. This work proposes and demonstrates a novel illumination scheme for a display in which the displaying images are visible only in specific spatial regions. The directional backlight ensures the image propagating to specific direction while imaging visibility can be controlled to terminate abruptly at certain distance from the display screen while exerting no influence to nearby regions. The working principle for such an illumination scheme is the use of the modulated coherent directional backlight through an axicon lens. It is shown that the illumination scheme can robustly deliver carried image information to the designated viewing region. This new illumination scheme has many advantages over conventional illumination, including its usage for personal display, very lower energy consumption, as well as minimizing light hazard pollution. 相似文献
26.
27.
Wei Shaowei Yu Guoxian Wang Jun Domeniconi Carlotta Zhang Xiangliang 《Machine Learning》2021,110(6):1505-1526
Machine Learning - Traditional clustering algorithms focus on a single clustering result; as such, they cannot explore potential diverse patterns of complex real world data. To deal with this... 相似文献
28.
29.
Fluorescence‐Activated Cell Sorters: Standing Surface Acoustic Wave (SSAW)‐Based Fluorescence‐Activated Cell Sorter (Small 40/2018)
下载免费PDF全文
![点击此处可从《Small (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
30.