全文获取类型
收费全文 | 685篇 |
免费 | 26篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 49篇 |
综合类 | 4篇 |
化学工业 | 184篇 |
金属工艺 | 7篇 |
机械仪表 | 9篇 |
建筑科学 | 5篇 |
能源动力 | 34篇 |
轻工业 | 44篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 52篇 |
一般工业技术 | 158篇 |
冶金工业 | 86篇 |
原子能技术 | 19篇 |
自动化技术 | 58篇 |
出版年
2023年 | 3篇 |
2022年 | 7篇 |
2021年 | 17篇 |
2020年 | 3篇 |
2019年 | 9篇 |
2018年 | 8篇 |
2017年 | 14篇 |
2016年 | 15篇 |
2015年 | 10篇 |
2014年 | 28篇 |
2013年 | 41篇 |
2012年 | 31篇 |
2011年 | 39篇 |
2010年 | 27篇 |
2009年 | 33篇 |
2008年 | 45篇 |
2007年 | 33篇 |
2006年 | 38篇 |
2005年 | 34篇 |
2004年 | 22篇 |
2003年 | 17篇 |
2002年 | 22篇 |
2001年 | 11篇 |
2000年 | 9篇 |
1999年 | 13篇 |
1998年 | 32篇 |
1997年 | 19篇 |
1996年 | 16篇 |
1995年 | 19篇 |
1994年 | 17篇 |
1993年 | 13篇 |
1992年 | 5篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 4篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 5篇 |
1983年 | 7篇 |
1982年 | 2篇 |
1981年 | 5篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 4篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有713条查询结果,搜索用时 15 毫秒
31.
Koji Mori Masuo Kaji Kotohiko Sekoguchi Manabu Sakane Masao Nakazatomi Hideo Shimizu 《亚洲传热研究》1996,25(8):499-510
Time-series information on both the cross-sectional mean liquid holdup along a tube axis and the gas-liquid phase distribution along a tube diameter was obtained by means of supermultiple cross-sectional mean liquid holdup probes (S-CHOP) and semi-supermultiple point-electrode probes (SS-PEP) for vertical downward gas-liquid two-phase flow. Typical time-spatial behavior charts of interface and gas-liquid interfacial profiles are presented. Close inspection of these results reveals that a huge wave and a disturbance wave appear in downward two-phase flow as well as upward flow. It was clarified that the huge wave flow region covers a wide range of superficial gas velocities. Wave velocity, wave width and maximum liquid holdup of individual waves were examined by wave-vein analysis. Histograms of these flow parameters were also studied. It was found that there exist distinct differences in wave width between the huge wave and the disturbance wave. © 1997 Scripta Technica, Inc. Heat Trans Jpn Res, 25(8): 499–510, 1996 相似文献
32.
Kotohiko Sekoguchi Koji Mori Masuo Kaji Megumi Miwa Masao Nakazatomi Hideo Shimizu 《亚洲传热研究》1996,25(8):568-579
Gas-liquid interfacial profiles in plug flow for both upward and downward flows were obtained using semi-supermultiple point-electrode probes, comprising 67 sensing tips arranged on a tube diameter. Typical interfacial profiles are demonstrated for both flows. Close inspection of the profiles reveals that four zones exist in a pair of gas and liquid slugs for upward plug flow and a high slip velocity region in downward plug flow. The lengths of the swelling liquid front zone and the wake zone were determined. The length of the wake zone strongly depends on the relative velocity between the liquid film around the gas slug and the liquid phase in the liquid slug. Characteristic distributions of bubbles within liquid slugs were found, i.e., three types of radial distributions of void fraction, namely saddle-shaped, trapezoidal and bullet-shaped distributions, exist for upward flow. The two types for downward flow exclude the saddle-shaped distribution. © 1997 Scripta Technica, Inc. Heat Trans Jpn Res, 25 (8): 568–579, 1996 相似文献
33.
Saeko Yanaka Shigetaka Nishiguchi Rina Yogo Hiroki Watanabe Jiana Shen Hirokazu Yagi Takayuki Uchihashi Koichi Kato 《International journal of molecular sciences》2022,23(4)
Immunoglobulin G (IgG) adopts a modular multidomain structure that mediates antigen recognition and effector functions, such as complement-dependent cytotoxicity. IgG molecules are self-assembled into a hexameric ring on antigen-containing membranes, recruiting the complement component C1q. In order to provide deeper insights into the initial step of the complement pathway, we report a high-speed atomic force microscopy study for the quantitative visualization of the interaction between mouse IgG and the C1 complex composed of C1q, C1r, and C1s. The results showed that the C1q in the C1 complex is restricted regarding internal motion, and that it has a stronger binding affinity for on-membrane IgG2b assemblages than C1q alone, presumably because of the lower conformational entropy loss upon binding. Furthermore, we visualized a 1:1 stoichiometric interaction between C1/C1q and an IgG2a variant that lacks the entire CH1 domain in the absence of an antigen. In addition to the canonical C1q-binding site on Fc, their interactions are mediated through a secondary site on the CL domain that is cryptic in the presence of the CH1 domain. Our findings offer clues for novel-modality therapeutic antibodies. 相似文献
34.
Kiyoharu Nakagawa Hirokazu Oda Akira Yamashita Masahiro Okamoto Yoichi Sato Hidenori Gamo Mikka Nishitani-Gamo Kazuyuki Ogawa Toshihiro Ando 《Journal of Materials Science》2009,44(1):221-226
We developed a novel spherical carbon material. The spherical carbon is composed of a high density of carbon nanotubes or
nanofilaments, and includes an oxidized diamond particle as a core. Syntheses of this carbon in high volume with high selectivity
may be possible. It is expected that this carbon will be useful as a catalyst material for fuel cells, electric double-layer
capacitors, etc. 相似文献
35.
Hirokazu Ozaki Atsushi Kara Zixue Cheng 《Quality and Reliability Engineering International》2011,27(7):895-903
In this paper, we investigate service‐level assurance in high‐availability multi‐unit systems using the M‐for‐N backup scheme. M‐for‐N shared protection (backup) systems with priority control (i.e. prioritized protection switching and prioritized re‐housing of repaired units) can be applied to actual telecommunication devices that are subject to service‐level agreement (SLA) involving reliability measures. A priority level is assigned to each end user in such a system and the switching and unit re‐housing process is subject to the priority. The main contribution of this paper is to give a practical computation method of the user‐perceived availability under the priority control. Our case studies for real telecommunication systems reveal the effect of priority control on the user‐perceived availability. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
36.
37.
38.
A function of image recognition is indispensable to an intelligent robot which can coexist with a human being. Furthermore,
the intelligent robot needs to understand the environment of their action range by getting information of characters and maps
on advertisements and signboards in order to move autonomously. In this research, a method to search the route from the starting
point to the destination on a guidance map, by extracting the road area on the map and revising degradation portions because
of overlapping with characters or other figures is proposed. And the validity of this method is shown by the experiment using
maps which were collected from advertisements or pamphlets. 相似文献
39.
Adrian David Cheok Xubo Yang Zhou Zhi Ying Mark Billinghurst Hirokazu Kato 《Personal and Ubiquitous Computing》2002,6(5-6):430-442
This paper presents a novel computer entertainment system which recaptures human touch and physical interaction with the
real-world environment as essential elements of the game play, whilst also maintaining the exciting fantasy features of traditional
computer entertainment. Our system called ‘Touch-Space’ is an embodied (ubiquitous, tangible, and social) computing based
Mixed Reality (MR) game space which regains the physical and social aspects of traditional game play. In this novel game space,
the real-world environment is an essential and intrinsic game element, and the human’s physical context influences the game
play. It also provides the full spectrum of game interaction experience ranging from the real physical environment (human
to human and human to physical world interaction), to augmented reality, to the virtual environment. It allows tangible interactions
between players and virtual objects, and collaborations between players in different levels of reality. Thus, the system re-invigorates
computer entertainment systems with social human-to-human and human-to-physical touch interactions.
Correspondence to: Professor A. Cheok, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260. Email: adriancheok@nus.edu.sg 相似文献
40.
Effects of pore diameter, bath surface pressure, and nozzle diameter on the bubble formation from a porous nozzle 总被引:1,自引:0,他引:1
Manabu Iguchi Masuo Kaji Zen-Ichiro Morita 《Metallurgical and Materials Transactions B》1998,29(6):1209-1218
The effects of the pore diameter, bath surface pressure, and nozzle diameter on the bubble formation from a porous bottom
nozzle placed in a water bath and on the behavior of rising bubbles were investigated with still and high-speed video cameras
and a two-needle electroresistivity probe. Three types of bubble dispersion patterns were observed with respect to gas flow
rate, and they were named the low, medium, and high gas flow rate regimes. The transition boundaries between these gas flow
rate regimes were expressed in terms of the superficial velocity at the nozzle exit, i.e., the volumetric gas flow rate per unit nozzle surface area. These transition boundaries were dependent on the pore diameter
but hardly dependent on the bath surface pressure and the porous nozzle diameter. The characteristics of rising bubbles in
each gas flow rate regime were investigated as functions of the three parameters. 相似文献