全文获取类型
收费全文 | 2078篇 |
免费 | 60篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 121篇 |
综合类 | 2篇 |
化学工业 | 590篇 |
金属工艺 | 82篇 |
机械仪表 | 42篇 |
建筑科学 | 35篇 |
能源动力 | 97篇 |
轻工业 | 100篇 |
水利工程 | 3篇 |
无线电 | 203篇 |
一般工业技术 | 408篇 |
冶金工业 | 181篇 |
原子能技术 | 88篇 |
自动化技术 | 192篇 |
出版年
2023年 | 10篇 |
2022年 | 40篇 |
2021年 | 69篇 |
2020年 | 20篇 |
2019年 | 27篇 |
2018年 | 54篇 |
2017年 | 21篇 |
2016年 | 48篇 |
2015年 | 36篇 |
2014年 | 67篇 |
2013年 | 136篇 |
2012年 | 72篇 |
2011年 | 115篇 |
2010年 | 100篇 |
2009年 | 115篇 |
2008年 | 90篇 |
2007年 | 86篇 |
2006年 | 80篇 |
2005年 | 60篇 |
2004年 | 51篇 |
2003年 | 56篇 |
2002年 | 44篇 |
2001年 | 41篇 |
2000年 | 32篇 |
1999年 | 61篇 |
1998年 | 85篇 |
1997年 | 57篇 |
1996年 | 45篇 |
1995年 | 49篇 |
1994年 | 38篇 |
1993年 | 36篇 |
1992年 | 23篇 |
1991年 | 23篇 |
1990年 | 18篇 |
1989年 | 25篇 |
1988年 | 11篇 |
1987年 | 23篇 |
1986年 | 15篇 |
1985年 | 22篇 |
1984年 | 18篇 |
1983年 | 12篇 |
1982年 | 11篇 |
1981年 | 12篇 |
1980年 | 10篇 |
1979年 | 11篇 |
1978年 | 14篇 |
1977年 | 16篇 |
1976年 | 11篇 |
1974年 | 5篇 |
1973年 | 5篇 |
排序方式: 共有2144条查询结果,搜索用时 0 毫秒
51.
Yoshihiko Hangai Hiroaki Yoshida Nobuhiro Yoshikawa 《Metallurgical and Materials Transactions A》2012,43(3):802-805
A new friction powder compaction (FPC) process by the sintering and dissolution process (SDP) route for fabricating open-cell
aluminum (Al) foam, which requires no external heat sources, was developed. Foams with porosities of 74 and 83 pct were successfully
fabricated and their compressive responses were investigated. The sintered mixture during the removal process was observed
nondestructively by X-ray computed tomography (CT) to reveal the progress of the removal of soluble particles and to confirm
that they were completely dissolved. 相似文献
52.
53.
Analysis and modeling of char particle combustion with heat and multicomponent mass transfer 总被引:1,自引:0,他引:1
A char combustion model suitable for a large-scale boiler/gasifier simulation, which considers the variation of physical quantities in the radial direction of char particles, is developed and examined. The structural evolution within particles is formulated using the basic concept of the random pore model while simultaneously considering particle shrinkage. To reduce the computational cost, a new approximate analytical boundary condition is applied to the particle surface, which is approximately derived from the Stefan–Maxwell equations. The boundary condition showed reasonably good agreement with direct numerical integration with a fine grid resolution by the finite difference method under arbitrary conditions. The model was applied to combustion in a drop tube furnace and showed qualitatively good agreement with experiments, including for the burnout behavior in the late stages. It is revealed that the profiles of the oxygen mole fraction, conversion, and combustion rate have considerably different characteristics in small and large particles. This means that a model that considers one total conversion for each particle is insufficient to describe the state of particles. Since our char combustion model requires only one fitting parameter, which is determined from information on the internal geometry of char particles, it is useful for performing numerical simulations. 相似文献
54.
Kosuke Sato Akihiko Kono Hiroaki Urushibata Yoji Fujita Masato Koyama 《Electrical Engineering in Japan》2019,208(3-4):48-63
The authors developed a physics‐based equivalent circuit model of a lithium‐ion battery (LIB) whose parameters are continually updated, reflecting the theoretical calculation results of the Butler‐Volmer equation, diffusion equations of the lithium‐ion and lithium, and Nernst equations of the liquid and solid phases. The developed model was applied to the charge/discharge simulations of an LIB, and the experimental and simulated results of constant current discharges and pulsed‐charge/discharge were found to be in excellent agreement. In particular, using the developed model, analyzing transient responses of the LIB derived from the transition of the electric double layer charging to the electrode reaction is possible. These results demonstrate that the electrochemical performance of an LIB can be calculated on a circuit simulator using the developed model. 相似文献
55.
Junji Fukuda Shintaro Takahashi Tatsuya Osaki Naoto Mochizuki Hiroaki Suzuki 《Science and Technology of Advanced Materials》2012,13(6)
Plugs, i.e. droplets formed in a microchannel, may revolutionize microfluidic cell-based assays. This study describes a microdevice that handles nanolitre-scale liquid plugs for the preparation of various culture setups and subsequent cellular assays. An important feature of this mode of liquid operation is that the recirculation flow generated inside the plug promotes the rapid mixing of different solutions after plugs are merged, and it keeps cell suspensions homogeneous. Thus, serial dilutions of reagents and cell suspensions with different cell densities and cell types were rapidly performed using nanolitres of solution. Cells seeded through the plug processing grew well in the microdevice, and subsequent plug processing was used to detect the glucose consumption of cells and cellular responses to anticancer agents. The plug-based microdevice may provide a useful platform for cell-based assay systems in various fields, including fundamental cell biology and drug screening applications. 相似文献
56.
57.
58.
59.
Ilham Alimuddin Luhur Bayuaji Rohaya Langkoke Josaphat Tetuko Sri Sumantyo Hiroaki Kuze 《土木工程与建筑:英文版》2013,(10):1287-1294
Urban growth has been a major issue in environmental monitoring and changes occurred on land surfaces have been monitored by applying remote sensing as well as ground measurement. Most major cities in the world have experienced land subsidence phenomena on some parts of them due to the load of development and modernization. Excessive extraction of groundwater for the needs of industry has led to the condition where the water table drops, and this can possibly trigger subsidence, as observed in Indonesian cities. In this study the authors have shown that the application of DInSAR (differential interferometric synthetic aperture radar) technique using Japanese Earth Resources Satellite-I Synthetic Aperture Radar JERS-I SAR data can reveal subsidence conditions in the studied Makassar city area. Landsat TM (thematic mapper) images were used to evaluate the change of land cover during the observation period of 1994-1999. Makassar is fiat, covered mainly by alluvium deposit that is vulnerable to the load of constructions, and volcanic formations which is porous and will easily be degraded by groundwater extraction. It is found that mostly the subsidence has occurred in the western part of the city, including the industrial district, reclamation area, trading center area and the seaport area. The ground survey has indicated that high human activity exists in every point of subsidence. It is likely that various human activities such as ground water pumping and construction work should have affected the local subsidence phenomena in Makassar, as in the case of other large-scale cities in Indonesia. 相似文献
60.
Ahn Seongyool Yu Panlong Watanabe Hiroaki Kurose Ryoichi Tanno Kenji Kitagawa Toshiaki 《Journal of Mechanical Science and Technology》2021,35(5):2209-2218
Journal of Mechanical Science and Technology - A three-dimensional numerical simulation was performed to investigate the physics and combustion characteristics of a two-phase reacting turbulent... 相似文献