全文获取类型
收费全文 | 395篇 |
免费 | 32篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 18篇 |
综合类 | 5篇 |
化学工业 | 76篇 |
金属工艺 | 16篇 |
机械仪表 | 13篇 |
建筑科学 | 14篇 |
能源动力 | 19篇 |
轻工业 | 44篇 |
水利工程 | 3篇 |
石油天然气 | 23篇 |
无线电 | 38篇 |
一般工业技术 | 70篇 |
冶金工业 | 38篇 |
原子能技术 | 5篇 |
自动化技术 | 51篇 |
出版年
2024年 | 2篇 |
2023年 | 7篇 |
2022年 | 8篇 |
2021年 | 22篇 |
2020年 | 19篇 |
2019年 | 27篇 |
2018年 | 19篇 |
2017年 | 19篇 |
2016年 | 21篇 |
2015年 | 17篇 |
2014年 | 25篇 |
2013年 | 33篇 |
2012年 | 30篇 |
2011年 | 23篇 |
2010年 | 19篇 |
2009年 | 5篇 |
2008年 | 14篇 |
2007年 | 20篇 |
2006年 | 15篇 |
2005年 | 11篇 |
2004年 | 5篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1997年 | 8篇 |
1996年 | 9篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1967年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有433条查询结果,搜索用时 31 毫秒
1.
Neural Processing Letters - Political optimizer (PO) is a recently proposed human-behavior inspired meta-heuristic, which has shown tremendous performance on complex multimodal functions as well as... 相似文献
2.
3.
Genomic signal processing (GSP) concerns the processing of genomic signals. It may be defined as the analysis, processing, and use of genomic signals to gain biological knowledge and the translation of that knowledge into systems-based applications. In this article, the authors discuss the key research issues for GSP. It is important to recognize that "genomic signal processing" is not a name for genomic bioinformatics nor for the application of signal processing methods in genomics. We note that the research issues pertaining to GSP fit within the overall challenges confronting research in the area of multimodal biomedical systems. 相似文献
4.
In this paper, mobility parameters for enhancement-mode N-channel 4H SiC MOSFETs are extracted and implemented into 2-D device simulation program and SPICE circuit simulator. The experimental data were obtained from lateral N-channel 4H SiC MOSFETs with nitrided oxide–semiconductor interfaces, exhibiting normal mobility behavior. The presence of increasing interface-trap density (Dit) toward the edge of the conduction band is included during the 2-D device simulation. Using measured distribution of interface-trap density for simulation of the transfer characteristics leads to a good agreement with the experimental transfer characteristic. 相似文献
5.
6.
7.
8.
Islam S. Humail F. Akhtar S.J. Askari M. Tufail Xuanhui Qu 《International Journal of Refractory Metals and Hard Materials》2007,25(5-6):380-385
Tungsten heavy alloys (WHAs) are metal–metal composites consisting of nearly pure spherical tungsten particles embedded in a Ni–Fe–W or Ni–Co–W or Ni–Cu–W ductile matrix. In this dual phase alloy, there are several complicated relations between the ductile matrix and hard tungsten particles. The aim of this research was to examine the effect of varying tungsten content on the microstructure and mechanical properties of tungsten heavy alloys. The microstructural parameters (grain size, connectivity, contiguity and solid volume fraction) were measured and were found to have a significant effect on the mechanical properties of tungsten-based heavy alloys. The result shows that the binding strength between the W and the matrix phase has a major influence on the ductility of tungsten-based alloys. The larger this binding force is, the better the ductility is. 相似文献
9.
Reza Kachouie Sima Sedighadeli Rajiv Khosla Mei-Tai Chu 《International journal of human-computer interaction》2014,30(5):369-393
The world’s population is aging, and developed countries are engaged in developing a new aged-care paradigm to reduce spiraling healthcare costs. Assistive technologies like Socially Assistive Robots (SAR) are being considered as enablers to support the process of care giving or keep elderly at home longer. This article reports a mixed-method systematic review of SAR in elderly care and recognizes its impact on elderly well-being, integrating evidence from qualitative and quantitative studies. It follows the principles explained in Cochrane Handbook for Systematic Reviews of Interventions and classifies interventions, measures, and outcomes of field trials of SAR in elderly care. Eighty-six studies in 37 study groups have been included. The findings imply positive effects of SAR on elderly well-being. Ten significant recommendations are made to help avoid the current limitations of existing research and to improve future research and its applicability. This review revealed that SAR can potentially enhance elderly well-being and decrease the workload on caregivers. There is a need for rigorous research methodology, person-centered care, caregiver expectation model, multimodal interaction, multimodal data collection, and modeling of culturally diverse groups to facilitate acceptability of SAR. 相似文献
10.
电磁式电压互感器(PT)作为电力系统中已大规模应用的电压感知设备,在低频电磁暂态电压激励下可能出现铁心饱和,引起二次响应电压波形畸变、测量误差激增.通过求解PT的"低频过电压激励-响应"逆问题,由PT二次响应电压计算得到其一次激励电压.该文基于电磁对偶原理建立计及铁心深度饱和特性的PT正向电路模型及其参数提取方法,进而构建其逆向数学模型,提出PT"低频过电压激励-响应"逆问题的求解方法.针对10kV真型PT的低频暂态仿真与试验数据进行"低频过电压激励-响应"逆问题求解方法的验证,结果表明:提出的逆向求解方法可将PT的低频电磁暂态测量误差从65.6%降低至10%,解决了其在低频暂态电压激励下的测量失真难题. 相似文献