全文获取类型
收费全文 | 168篇 |
免费 | 4篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 49篇 |
金属工艺 | 8篇 |
机械仪表 | 1篇 |
能源动力 | 7篇 |
轻工业 | 14篇 |
无线电 | 9篇 |
一般工业技术 | 28篇 |
冶金工业 | 31篇 |
原子能技术 | 16篇 |
自动化技术 | 4篇 |
出版年
2023年 | 3篇 |
2022年 | 3篇 |
2021年 | 4篇 |
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2014年 | 6篇 |
2013年 | 11篇 |
2012年 | 7篇 |
2011年 | 14篇 |
2010年 | 2篇 |
2009年 | 5篇 |
2008年 | 5篇 |
2007年 | 9篇 |
2006年 | 5篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2003年 | 9篇 |
2002年 | 2篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 9篇 |
1997年 | 6篇 |
1996年 | 6篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1976年 | 2篇 |
1973年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有172条查询结果,搜索用时 46 毫秒
51.
Koji Morita Shuai Zhang Seiichi Koshizuka Yoshiharu Tobita Hidemasa Yamano Noriyuki Shirakawa Fusao Inoue Hiroaki Yugo Masanori Naitoh Hidetoshi Okada Yuichi Yamamoto Masashi Himi Etsujo Hirano Sensuke Shimizu Masaya Oue 《Nuclear Engineering and Design》2011,241(12):4672-4681
A five-year research project has been initiated in 2005 to develop a code based on the MPS (Moving Particle Semi-implicit) method for detailed analysis of key phenomena in core disruptive accidents (CDAs) of sodium-cooled fast reactors (SFRs). The code is named COMPASS (Computer Code with Moving Particle Semi-implicit for Reactor Safety Analysis). The key phenomena include (1) fuel pin failure and disruption, (2) molten pool boiling, (3) melt freezing and blockage formation, (4) duct wall failure, (5) low-energy disruptive core motion, (6) debris-bed coolability, and (7) metal–fuel pin failure. Validation study of COMPASS is progressing for these key phenomena. In this paper, recent COMPASS results of detailed analyses for the several key phenomena are summarized. Simulations of GEYSER and THEFIS experiments were performed for dispersion and freezing behaviors of molten materials in narrow flow channels. In particular, the latter experiment using melt–solid mixture is also related to fundamental behavior of low energy disruptive core. CABRI-TPA2 experiment was simulated for boiling behavior of molten core pool. Expected mechanism of heat transfer between molten fuel and steel mixture was reproduced by the simulation. Analyses of structural dynamics using elastoplastic mechanics and fracture criteria were performed for SCARABEE BE+3 and CABRI E7 experiments. These two analyses are especially focused on thermal and mechanical failure of steel duct wall and fuel pin, respectively. The present results demonstrate COMPASS will be useful to understand and clarify the key phenomena of CDAs in SFRs in details. 相似文献
52.
Kengo Sasaki Masahiko Morita Daisuke Sasaki Shin-ichi Hirano Norio Matsumoto Naoya Ohmura Yasuo Igarashi 《Journal of Bioscience and Bioengineering》2011,111(1):47-49
Methane fermentation was successfully carried out in bioelectrochemical reactors without membranes under a working potential of − 0.6 or − 0.8 V (vs. Ag/AgCl) and neutral pH conditions. The hydrogenotrophic methanogens that dominated on the anodic and cathodic electrodes differed from those found on the electrodes in the control reactors without electrochemical reactions. 相似文献
53.
Machiko Ohmura 《Polymer》2004,45(20):6967-6975
Inclusion complexes of α-, β-, and γ-cyclodextrins (α-, β-, and γ-CyDs) were prepared with poly(ethylene oxide) (PEO), poly(propylene oxide) (PPO), and poly(ethylene adipate) (PEA), respectively. By observing respective inclusion complexes by transmission electron microscopy, it was found that the crystalline complexes grew as follows: (1) α-CyD-PEO complexes formed a hexagonal crystal, (2) β-CyD-PPO complexes crystallized with hexagonal lateral packing of molecular columns with their axes tilted at the basal plane, and (3) γ-CyD-PEA crystallized in a tetragonal form with a super lattice with cell dimensions a=b=13.40 nm, which consisted of sub-cell with cell dimensions a′=b′=1.657 nm. No diffuse scattering was observed in the electron diffraction pattern of complexes of α-CyD-PEO and β-CyD-PPO, because disordering of guest molecules within host channels gave no diffuse scattering as long as host molecules were arrayed in an ordered way. γ-CyD-PEA complexes gave characteristic streaky diffuse scattering along a* and b*. Stacking faults occurred in γ-CyD-PEA complexes. 相似文献
54.
55.
T. Kasemura C. Komatu H. Nishihara S. Takahashi Y. Oshibe H. Ohmura T. Yamamoto 《The Journal of Adhesion》1994,47(1):17-29
In order to improve oil and water repellency, silicone-containing block copolymers, composed of methylmethacrylate (MMA), glycidylmethacrylate (GMA), and polydimethylsiloxanemethacrylate (SMA), were blended in an epoxy resin. It was expected that the low surface energy dimethylsiloxane segments would adsorb and orient at the exterior of the resin to make a thin surface phase and the glycidyl groups would mesh with the epoxy resin by primary bonding. The techniques of X-ray photoelectron spectroscopy (ESCA), dynamic contact angle (DCA) and peel strength measurements of pressure sensitive adhesives were used to characterize the modified epoxy resin surface phases. The amount of Si2p obtained via angular dependent ESCA investigation in the near surface region of the modified resin increased with decreasing sampling depth. With an increase in modifier content, both the amount of Si2p and O1s also increased. Both advancing and receding contact angles for an aluminum plate coated with modified resin, measured by dipping into and out of water, increased with the addition of these modifiers. The peel strength of a pressure sensitive adhesive tape affixed to the modified epoxy resin decreased dramatically with increasing modifier content. It was found that these copolymers were good surface modifiers to improve oil and water repellency and that they acted as release agents. 相似文献
56.
A temperature-insensitive erbium-doped fiber amplifier for terrestrial wavelength-division-multiplexing systems 总被引:1,自引:0,他引:1
H. Nakaji Y. Ishizawa M. Ohmura T. Shibata A. Inoue M. Shigematsu 《Photonics Technology Letters, IEEE》2003,15(11):1522-1524
We have evaluated a variation in the temperature dependence of an erbium-doped fiber gain spectrum by a pump wavelength in the 980-nm band for the first time. By optimizing both the pump wavelength in the 980-nm band and a temperature-sensitive gain flattening filter, the gain change of an erbium-doped fiber amplifier was successfully suppressed to 0.18 dB/sub pp/ in the temperature range between 0/spl deg/C and 65/spl deg/C and the wavelength range of 37.0 nm. 相似文献
57.
Shoji Fujiwara Takatoshi Ogawa YOshifumi Ohmura Imao Tamura 《Metallurgical and Materials Transactions A》1983,14(5):1067-1077
In Fe-4 pct Mo-0.2 pct C martensite which is a typical secondary hardening steel, premature failure occurred in tensile test
at 600 °C to 700 °C where solute atoms could diffuse easily. To clarify this phenomenon, the quenched specimens were tempered
under applied stress and tensile-tested at room temperature. The following results were obtained: (1) Typical intergranular
fracture was observed in specimens tempered in a temperature range of 600 °C to 650 °C with tempering times of five minutes
to 10 minutes and applied stress (70 MPa to 140 MPa). (2) Based on Auger analysis, this phenomenon was considered to be caused
by segregation of P, S, and Mo on prior austenite grain boundaries due to applied stress. (3) The direction of applied stress
was found to be very significant. Namely, when the tensile direction was parallel to the applied stress during tempering,
the specimen was more brittle, and when tensile direction was normal to the applied stress, the specimen was not so brittle.
(4) To reduce this embrittlement, solution treatment temperature was adjusted, and it was found that the embrittlement was
considerably reduced both in specimens with fine prior austenite grains and with some ferrite phase on prior austenite grain
boundaries.
Formerly with Kyoto University
Formerly with Kyoto University
This paper is based on a presentation made at the “Peter G. Winchell Symposium on Tempering of Steel” held at the Louisville
Meeting of The Metallurgical Society of AIME, October 12-13, 1981, under the sponsorship of the TMS-AIME Ferrous Metallurgy
and Heat Treatment Committees. 相似文献
58.
Songbai Cheng Hirotaka Tagami Hidemasa Yamano Tohru Suzuki Yoshiharu Tobita Syohei Taketa 《Journal of Nuclear Science and Technology》2013,50(9):1096-1106
Studies on debris bed self-leveling behavior with non-spherical particles are crucial in the assessment of actual leveling behavior that could occur in core disruptive accident of sodium-cooled fast reactors. Although in our previous publications, a simple empirical model (based model), with its wide applicability confirmed over various experimental conditions, has been successfully advanced to predict the transient leveling behavior, up until now this model is restricted to calculations of debris bed of spherical particles. Focusing on this aspect, in this study a series of experiments using non-spherical particles was performed within a recently developed comparatively larger scale experimental facility. Based on the knowledge and data obtained, an extension scheme was suggested with the intention to extend the base model to cover the particle-shape influence. The proposed scheme principally consists of two parts – with one part for correcting the terminal velocity of a single non-spherical particle, which is the key parameter in our base model, and the other for representing the additional particle–particle interactions caused by the shape-related parameters. Through detailed analyses, it is found that by coupling this scheme, good agreement between experimental and predicted results can be achieved for both spherical and non-spherical particles given current range of experimental conditions. 相似文献
59.
Sasaki D Sasaki K Morita M Hirano S Matsumoto N Ohmura N 《Journal of Bioscience and Bioengineering》2012,114(1):59-63
Bioelectrochemical systems can affect microbial metabolism by controlling the redox potential. We constructed bioelectrochemical cultures of the proteolytic bacterium, Coprothermobacter proteolyticus strain CT-1, both as a single-culture and as a co-culture with the hydrogenotrophic methanogen, Methanothermobacter thermautotrophicus strain ?H, to investigate the influences of bioelectrochemical regulation on facultatively syntrophic proteolysis. The co-culture and single-culture were cultivated at 55°C with an anaerobic medium containing casein as the carbon source. The working electrode potential of the bioelectrochemical system was controlled at -0.8V (vs. Ag/AgCl) for bioelectrochemical cultures and was not controlled for non-bioelectrochemical cultures. The cell densities of hydrogenotrophic methanogen and methane production in the bioelectrochemical co-culture were 3.6 and 1.5 times higher than those in the non-bioelectrochemical co-culture after 7 days of cultivation, respectively. Contrastingly, the cell density of Coprothermobacter sp. in the bioelectrochemical co-culture was only 1.3 times higher than that in the non-bioelectrochemical co-culture. The protein decomposition rates were nearly proportional to the cell density of Coprothermobacter sp. in the all types of cultures. These results indicate that bioelectrochemical regulation, particularly, affected the carbon fixation of the hydrogenotrophic methanogen and that facultatively syntrophic proteolysis was accelerated as a result of hydrogen consumption by the methanogens growing well in bioelectrochemical co-cultures. 相似文献
60.
Makoto Ozaki Shigeo Tomura Ryo Ohmura Yasuhiko H. Mori 《International Journal of Hydrogen Energy》2014
Different technologies possibly applicable for large-scale hydrogen storage in urban or industrial-complex areas have been comparatively evaluated, focusing on the facility-construction costs, the utility expense, and the ground area required for the facility for each technology. The specific technologies examined in this study are the storage in the form of compressed or liquefied gas, the storage using a metal hydride, and the storage using a clathrate hydrate. The common requirements for these technologies are the function of loading or unloading hydrogen gas at a rate up to 3000 Nm3/h and also the storage capacity of 6.48 × 106 Nm3 that enables continuous 90-day loading or unloading at the rate of 3000 Nm3/h. The storage using a clathrate hydrate is found to require the minimum ground area and, if the cool energy necessary for hydrate production is available from adjacent LNG facilities, the minimum annual depreciation + utility expense. 相似文献