全文获取类型
收费全文 | 406923篇 |
免费 | 47146篇 |
国内免费 | 32798篇 |
专业分类
电工技术 | 36219篇 |
技术理论 | 2篇 |
综合类 | 43554篇 |
化学工业 | 51177篇 |
金属工艺 | 28839篇 |
机械仪表 | 29143篇 |
建筑科学 | 31170篇 |
矿业工程 | 17494篇 |
能源动力 | 10559篇 |
轻工业 | 43549篇 |
水利工程 | 13461篇 |
石油天然气 | 15145篇 |
武器工业 | 6068篇 |
无线电 | 42843篇 |
一般工业技术 | 33655篇 |
冶金工业 | 17199篇 |
原子能技术 | 6855篇 |
自动化技术 | 59935篇 |
出版年
2024年 | 2150篇 |
2023年 | 6663篇 |
2022年 | 16128篇 |
2021年 | 20911篇 |
2020年 | 14571篇 |
2019年 | 10292篇 |
2018年 | 10887篇 |
2017年 | 12607篇 |
2016年 | 11136篇 |
2015年 | 18192篇 |
2014年 | 22984篇 |
2013年 | 27273篇 |
2012年 | 33932篇 |
2011年 | 35881篇 |
2010年 | 33553篇 |
2009年 | 31950篇 |
2008年 | 33253篇 |
2007年 | 31891篇 |
2006年 | 27613篇 |
2005年 | 22582篇 |
2004年 | 15862篇 |
2003年 | 10497篇 |
2002年 | 9637篇 |
2001年 | 8657篇 |
2000年 | 6990篇 |
1999年 | 3097篇 |
1998年 | 1292篇 |
1997年 | 1038篇 |
1996年 | 962篇 |
1995年 | 790篇 |
1994年 | 620篇 |
1993年 | 550篇 |
1992年 | 417篇 |
1991年 | 346篇 |
1990年 | 290篇 |
1989年 | 251篇 |
1988年 | 173篇 |
1987年 | 123篇 |
1986年 | 101篇 |
1985年 | 65篇 |
1984年 | 50篇 |
1983年 | 64篇 |
1982年 | 62篇 |
1981年 | 76篇 |
1980年 | 122篇 |
1979年 | 77篇 |
1965年 | 9篇 |
1959年 | 72篇 |
1957年 | 5篇 |
1951年 | 76篇 |
排序方式: 共有10000条查询结果,搜索用时 531 毫秒
41.
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
42.
刘欢语 《湖南工业职业技术学院学报》2021,21(5):40-42
一直以来,学术界都认为后现代主义的语言行为是属于一种充满质疑、反思和批判的认知范式.而对于提倡通俗文艺的今天,它所代表的意义又具有鲜明的时代特征.其独特的语言方式,既充满对美好事物的期盼,又对当下一些社会现象进行了有力批判.同时也应认识到后现代主义思潮下网络语言的局限性.因此,本文的重点是寻求一种对时代发展具有推动作用的语言行为,以此来实现大众更好的交流,进而推动社会政治经济文化和谐发展. 相似文献
43.
We used scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to observe the oral organelle, cytopharynx, and subpellicular structure of a Dileptus sp. The main results were as follows: (a) the cytostome was located on the ventral surface of the base of the beak, surrounded by a periportal matrix that integrated 135 microtube bundles. When these microtube bundles contract, radially arranged into a disk, the cytostome was closed. When these microtube bundles were stretch, they fell into the cytostome and opens. The diameter of the cytostome was about 16 μm regardless of its closure or opening, indicating that the contraction or elongation of these microtube bundles did not change the size of the cytostome, which was only related to whether it blocked the cytostome, thus determining the opening and closing of the cytostome. There were many microtube bundles on two sides of the feeding trough, which could widen or narrow the feeding trough and facilitate beak feeding. (b) The cytopharynx was basket‐like without a bottom with a diameter of about 6 μm and was woven from two kind fibers about 0.08 and 0.19 μm. (c) There were two types of extrusomes under the pellicle. Using transmission electron microscopy,the Type I extrusomes showed narrow and long egg shape, its cross section was circular which is composed by various electronic density of concentric. Using the scanning electron microscope, they were two slightly thin clavate, the length was about 5 μm, the diameter of the middle section was about 0.75 μm, and the diameter of the two ends was about 0.32 μm, they were distributed abundantly between the microtubule fasciculi which were located on both sides of the gap on the feeding groove. Using transmission electron microscopy, the Type II extrusomes showed egg shape. Using the scanning electron microscopy, they were about 1.6 × 0.8 μm in size, they were distributed abundantly under the body pellicle while rarely the proboscis. In addition, many different of developmental stages two types of extrusomes could be also seen in the cytoplasm. (d) There were very well‐developed fibrous systems under the pellicle that were woven from fibers about 0.14 μm in diameter that attached to the pellicle and bound some organelles in the cytoplasm (e.g., mitochondria, extrusomes) and other structures to the cytoplasm and maintained cell morphology. The results of this study not only supplement and enrich the morphological contents of the Dileptus sp., but also provide the basis for the study of the taxonomy of the Dileptus sp. It also provides a new method for researchers to explore the morphology and structure of ciliate cells under the cortex by SEM. 相似文献
44.
为了研究循环流化床(CFB)锅炉燃用无烟煤时床温及选择性非催化还原(SNCR)脱硝对于NO和N2O排放的影响,在1 MW CFB试验装置上开展了试验研究。结果表明:床温由880 ℃提高到970 ℃,NO排放质量浓度由119.5 mg/m3上升到226.0 mg/m3,N2O排放质量浓度由216.0 mg/m3降低到102.2 mg/m3;在氨氮摩尔比(NSR)为0~3.7之间,随着NSR的提高,脱硝效率从0上升到50.72%;进一步提高NSR到5.2,脱硝效率升至53.61%,增加较为缓慢;随着NSR从0提高到1.7,N2O排放质量浓度由84.3 mg/m3上升至118.3 mg/m3,增长较为缓慢;进一步提高NSR至2.0,N2O排放质量浓度上升至187.7 mg/m3,增长速度提高;继续提高NSR至5.2,N2O排放质量浓度上升至381.4 mg/m3;CFB锅炉采用以尿素为还原剂的SNCR脱硝工艺时,单纯通过加大NSR来提高脱硝效率不仅效果有限,过量喷入的还原剂会造成N2O排放量的显著提高。 相似文献
45.
47.
48.
49.
在新型二次电池产业的发展中,氢镍电池市场不断萎缩,锂离子电池市场正处于黄金时代。通过对日本和中国新型二次电池产业发展历程分析,我国主要针对低端市场,高端市场为日本占据,并从日本发展经验中提出了可供我国锂离子电动车电池发展的借鉴之处。 相似文献
50.
在全国天然气管道“主干互联、区域成网”(以下简称“互联互通”)基础格局逐渐形成的背景下,天然气管网规模日益扩大、管道分支和气源增加,并且分布不集中、输送方向可变,使得输气方案更加灵活,可以更好地解决某些地域的供气紧张问题;但受现有站场和设备的限制,暂不能满足某些多线组合极限工况,使得“互联互通”的初衷难以全部实现。为了使得现有的各输气干线在实现“互联互通”之后可以满足更多的多线组合工况,在分析“互联互通”背景下M管网工况变化的基础上,研发了可以进行水力仿真和压气站方案制订的计算软件,并对3种极限工况下的不同输气量情况进行了可行性试算,进而基于试算结果提出了相应的管网改进建议。研究结果表明:(1)经验证,软件计算误差满足要求;(2)在M管道某处增设压气站或在某些输气站场配置压缩机组;(3) M管网改进调整后,可以完成大部分的多线组合极限工况,真正实现“互联互通”的输气方案。结论认为,该研究成果有助于推进全国天然气管网早日实现“互联互通”。 相似文献