全文获取类型
收费全文 | 10496篇 |
免费 | 1163篇 |
国内免费 | 512篇 |
专业分类
电工技术 | 733篇 |
综合类 | 674篇 |
化学工业 | 1585篇 |
金属工艺 | 486篇 |
机械仪表 | 585篇 |
建筑科学 | 863篇 |
矿业工程 | 288篇 |
能源动力 | 243篇 |
轻工业 | 1018篇 |
水利工程 | 274篇 |
石油天然气 | 297篇 |
武器工业 | 116篇 |
无线电 | 997篇 |
一般工业技术 | 1110篇 |
冶金工业 | 1033篇 |
原子能技术 | 91篇 |
自动化技术 | 1778篇 |
出版年
2024年 | 24篇 |
2023年 | 194篇 |
2022年 | 378篇 |
2021年 | 527篇 |
2020年 | 387篇 |
2019年 | 326篇 |
2018年 | 341篇 |
2017年 | 356篇 |
2016年 | 319篇 |
2015年 | 442篇 |
2014年 | 561篇 |
2013年 | 779篇 |
2012年 | 732篇 |
2011年 | 785篇 |
2010年 | 669篇 |
2009年 | 601篇 |
2008年 | 631篇 |
2007年 | 587篇 |
2006年 | 528篇 |
2005年 | 440篇 |
2004年 | 342篇 |
2003年 | 293篇 |
2002年 | 345篇 |
2001年 | 272篇 |
2000年 | 183篇 |
1999年 | 134篇 |
1998年 | 103篇 |
1997年 | 118篇 |
1996年 | 93篇 |
1995年 | 60篇 |
1994年 | 81篇 |
1993年 | 67篇 |
1992年 | 46篇 |
1991年 | 27篇 |
1990年 | 39篇 |
1989年 | 39篇 |
1988年 | 36篇 |
1987年 | 35篇 |
1986年 | 30篇 |
1985年 | 26篇 |
1984年 | 29篇 |
1983年 | 23篇 |
1982年 | 15篇 |
1981年 | 16篇 |
1980年 | 13篇 |
1979年 | 11篇 |
1978年 | 11篇 |
1977年 | 16篇 |
1976年 | 12篇 |
1975年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
1.
2.
3.
Wireless Networks - Spatial and temporal correlation between sensor observations in an Internet of Things environment can be exploited to eliminate unnecessary transmissions. Transmitting less data... 相似文献
4.
5.
正With the improvement of the information level of the intelligent distribution network,power enterprises have accumulated a large amount of data,and the quality problems such as data anomaly and redundancy are becoming increasingly prominent.In this context,this paper proposes a multi-dimensional data quality 相似文献
6.
Ruxiu Liu Chia‐Heng Chu Ningquan Wang Tevhide Ozkaya‐Ahmadov Ozgun Civelekoglu Dohwan Lee A K M Arifuzzman A. Fatih Sarioglu 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(51)
Immunophenotyping is widely used to characterize cell populations in basic research and to diagnose diseases from surface biomarkers in the clinic. This process usually requires complex instruments such as flow cytometers or fluorescence microscopes, which are typically housed in centralized laboratories. Microfluidics are combined with an integrated electrical sensor network to create an antibody microarray for label‐free cell immunophenotyping against multiple antigens. The device works by fractionating the sample via capturing target subpopulations in an array of microfluidic chambers functionalized against different antigens and by electrically quantifying the cell capture statistics through a network of code‐multiplexed electrical sensors. Through a combinatorial arrangement of antibody sequences along different microfluidic paths, the device can measure the prevalence of different cell subpopulations in a sample from computational analysis of the electrical output signal. The device performance is characterized by analyzing heterogeneous samples of mixed tumor cell populations and then the technique is applied to determine leukocyte subpopulations in blood samples and the results are validated against complete blood cell count and flow cytometry results. Label‐free immunophenotyping of cell populations against multiple targets on a disposable electronic chip presents opportunities in global health and telemedicine applications for cell‐based diagnostics and health monitoring. 相似文献
7.
Bin Feng Xin Jiang Guisheng Zou Wengan Wang Tianming Sun Heng Yang Guanlei Zhao Mingye Dong Yu Xiao Hongwei Zhu Lei Liu 《Advanced functional materials》2021,31(29):2102359
The realization of liquid metal-based wearable systems will be a milestone toward high-performance, integrated electronic skin. However, despite the revolutionary progress achieved in many other components of electronic skin, liquid metal-based flexible sensors still suffer from poor sensitivity due to the insufficient resistance change of liquid metal to deformation. Herein, a nacre-inspired architecture composed of a biphasic pattern (liquid metal with Cr/Cu underlayer) as “bricks” and strain-sensitive Ag film as “mortar” is developed, which breaks the long-standing sensitivity bottleneck of liquid metal-based electronic skin. With 2 orders of magnitude of sensitivity amplification while maintaining wide (>85%) working range, for the first time, liquid metal-based strain sensors rival the state-of-art counterparts. This liquid metal composite features spatially regulated cracking behavior. On the one hand, hard Cr cells locally modulate the strain distribution, which avoids premature cut-through cracks and prolongs the defect propagation in the adjacent Ag film. On the other hand, the separated liquid metal cells prevent unfavorable continuous liquid-metal paths and create crack-free regions during strain. Demonstrated in diverse scenarios, the proposed design concept may spark more applications of ultrasensitive liquid metal-based electronic skins, and reveals a pathway for sensor development via crack engineering. 相似文献
8.
Heng Wang Hongbin Zhao Zefeng Zhao 《International Journal of Hydrogen Energy》2021,46(44):22956-22973
In this paper, a combined cooling, heating and power system based on diesel-fueled chemical looping hydrogen generation and solid oxide fuel cell, and with CO2 capture was established. The system can achieve efficient power generation while separating CO2 without energy consumption, and effectively avoid the carbon deposition problem. Aspen software is used to simulate the process of the system, and FORTRAN program is used to calculate, through the thermodynamic analysis model, the unique performance change law of the new system using diesel is obtained, and thermodynamic analysis is performed on the system at last. The results show that the power efficiency of the new system is 54.1%, while the exergy efficiency and fuel energy saving ratio can reach 53%. At the same time, the influence of fuel flow and fuel utilization factor on the system performance does not continue to increase or decrease, and the system performance parameters will have a peak value with the change of pressure. The results not only provide a theoretical basis for the future construction of new diesel-fueled energy supply system, but also provide a new idea for the optimization scheme of energy-saving system and carbon recovery. 相似文献
9.
文章将重点阐述消防监督检查中对火灾隐患的认定,并从实际角度出发,充分的考虑可能存在的问题,具体问题具体分析,制定相应的解决对策,以保证消防监督检查工作能够顺利的开展. 相似文献
10.