全文获取类型
收费全文 | 370篇 |
免费 | 10篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 12篇 |
综合类 | 4篇 |
化学工业 | 45篇 |
金属工艺 | 17篇 |
机械仪表 | 3篇 |
建筑科学 | 7篇 |
矿业工程 | 2篇 |
能源动力 | 9篇 |
轻工业 | 20篇 |
石油天然气 | 2篇 |
无线电 | 29篇 |
一般工业技术 | 59篇 |
冶金工业 | 102篇 |
原子能技术 | 3篇 |
自动化技术 | 67篇 |
出版年
2023年 | 3篇 |
2022年 | 11篇 |
2021年 | 6篇 |
2020年 | 6篇 |
2019年 | 10篇 |
2018年 | 8篇 |
2017年 | 3篇 |
2016年 | 10篇 |
2015年 | 6篇 |
2014年 | 13篇 |
2013年 | 11篇 |
2012年 | 11篇 |
2011年 | 10篇 |
2010年 | 10篇 |
2009年 | 12篇 |
2008年 | 9篇 |
2007年 | 12篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2004年 | 11篇 |
2003年 | 14篇 |
2002年 | 7篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1999年 | 11篇 |
1998年 | 49篇 |
1997年 | 20篇 |
1996年 | 19篇 |
1995年 | 15篇 |
1994年 | 15篇 |
1993年 | 15篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1986年 | 7篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1975年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有381条查询结果,搜索用时 15 毫秒
101.
The resistive transition to the superconducting (SC) state in -(ET)2NH4Hg(SCN)4 was studied under magnetic fields applied parallel to the conducting plane. The SC state is divided into three regions: (1) temperature-dependent resistive region, (2) zero-resistive region, and (3) temperature-independent resistive region. We observed twofold symmetry in the resistance under an in-plane magnetic field near the midpoint of the SC transition, which indicates that the upper critical field 0
H
c2 has the same twofold symmetry. This in-plane anisotropy can be ascribed to the crystal structure. 相似文献
102.
Model building of the two photointermediates, lumirhodopsin and metarhodopsin I, and the activated form of rhodopsin, metarhodopsin II, is described. An outward swing of the C-terminal portion of transmembrane segment 3, pivoting on Cys110 at the N-terminal end of transmembrane segment 3, led to structural models of lumirhodopsin and metarhodopsin I. The conformation of the chromophore in the lumirhodopsin and metarhodopsin I models is controlled by the motion of transmembrane segment 3 and agreed closely with the hydrogen-bonding states of the protonated Schiff base in lumirhodopsin and metarhodopsin I as deduced from their FTIR and resonance Raman spectra and with the negative and positive CD bands of lumirhodopsin and metarhodopsin I, respectively. The structure of metarhodopsin II was constructed by an outward swing of transmembrane segment 3 and the rigid-body motion of transmembrane segment 6. The arrangement of the entire transmembrane segment of the metarhodopsin II model closely agreed with the electron paramagnetic resonance spectra of spin-labeled rhodopsin mutants and provided a structural basis for the protonation of Glu134, which is a key process in transducin activation. 相似文献
103.
104.
Shingo Ichikawa Satoru Kuboshiki Akio Ishiguro Yoshiki Uchikawa 《Artificial Life and Robotics》1998,2(1):19-23
Biological information processing systems can be regarded as one of the ultimate decentralized systems, and have been expected
to provide various fruitful ideas in the engineering field. Among these systems, the immune system plays an important role
in coping with dynamically changing environments by constructing self-nonself recognition networks among different species
of antibodies, and has many interesting features from an engineering stand-point, such as learning, self-organizing abilities,
and so on. However, it has not yet been applied to engineering fields. Therefore we pay close attention to the immune system
and attempt to construct an artificial immune network for robot control. In this study we propose a new interpretation of
the roles of antibodies in terms of self-assertion and subordination, and apply this idea to a gait coordination problem of
a hexapod robot as a practical example. Several computer simulations are carried out, and the robustness against disturbances
and the feasibility of our method are confirmed.
This work was presented, in part, at the International Symposium on Artificial Life and Robotics, Oita, Japan, February 18–20,
1996 相似文献
105.
This study proposes feed-forward echo state networks (ESN) as an estimator, and couples it with second-order proportional-integral-derivative (PID) feedback extension to compensate for dead time in feedback systems. The system is tested for two-dimensional space motion patterns recognition and prediction using simulations, which allows control of noise input. Tikhonov regularization is employed for training readouts and second-order PID feedback minimizes prediction bias. Evaluation is done using mean squared error and the coupled system performs well compared to any of its standalone versions. The results suggest it is feasible to (1) ‘compress’ the memory capacity of the system, and (2) reduce the number optimization parameters, while maintaining the estimation performance and following the excitation property of the estimator. It is feasible to optimize the ESN using feedback gain although it plays a significant role in the proposed system because the improvement by bias correction is far greater than that of optimization; thus, simplifying the estimation to a feedback problem which is easily tuned using the Ziegler–Nichols method. 相似文献
106.
Yu. V. Sushko H. Ito T. Ishiguro K. Andres S. Horiuchi G. Saito N. D. Kushch E. B. Yagubskii 《Journal of Superconductivity》1994,7(6):937-941
Systematic experimental study of the electrical transport and static magnetization reveals a direct and delicate interplay between magnetism and superconductivity in the organic material-(BEDT-TTF)2Cu[N(CN)2]Cl, displayed through the specific temperature-pressure phase diagram, and such new effects for organic solids as the reentrant superconductivity in zero applied magnetic field and high-field-induced interchange between superconductivity and the nonmetallic resistive phase in the high-pressure region. 相似文献
107.
Fransiska Basoeki Fabio DallaLibera Takashi Minato Hiroshi Ishiguro 《Artificial Life and Robotics》2012,17(2):197-203
Developing motions for humanoid robots is time consuming. However, sport and dance instructors can easily adjust their students?? postures by simple touches. This suggests the possibility of exploiting touch for motion development, and allows us to propose a methodology based on this concept. To realize such a system, it is required to define how the robot should interpret touches. We propose a supervised learning approach to cope with this issue, and verify its feasibility experimentally. We then study the data collected by the algorithm, and show that the system is practical both for motion development and for studying human-robot tactile communication. In particular, we present considerations on the sparsity that characterize the whole process and suggest how sparsity can be exploited for efficient interpretation of tactile instructions. 相似文献
108.
K. Mori S. Maki M. Ishiguro 《International Journal of Machine Tools and Manufacture》2006,46(15):1966-1971
Resistance heat and artificial aging treatments were introduced into a stamping operation to improve the product strength and formability of Al–Mg–Si alloy sheets having bake hardenability used for automobile body panels. In this treatment, the sheets undergo re-solution by resistance heat treatment, composed of resistance heating and water quenching just before the stamping. Stamped sheets are artificially aged just after the stamping to increase product strength. In the experiment, Al–0.60% Si–0.74% Mg alloy sheets were chosen as an example of Al–Mg–Si alloy sheets having bake hardenability. The re-solution solution treatment of the sheets was sufficiently accomplished by rapid resistance heat treatment, and formability of the sheets was improved. Hardness of the formed products was increased by artificial aging. It was found that the present process is effective in improving the product strength and formability of Al–Mg–Si alloy sheets having bake hardenability due to the compactness and rapidness. 相似文献
109.
Some new sweet potato lines were developed from progenies of a new cultivar, Quick Sweet, having a low pasting temperature. Starch granules from these lines demonstrated an abnormal morphology characterized by cracking into fragments. Starch and amylose contents were different among these lines. Pasting temperatures of these lines determined by the Rapid Visco Analyser were 53.8 to 66.6°C, i.e. 10 to 20°C lower than that of the control. Peak viscosities of some lines were similar to that of the control. Starch retrogradation, evaluated by percentage of leaked water and hardness of starch gels after cold storage, revealed that the control starch retrograded during storage for two to six weeks, but the starches of some lines retrograded much more slowly than the control starch and exhibited excellent cold storage stability. The pasting temperature had significant positive correlations with the percentage of leaked water and the hardness. These results indicate that Quick Sweet is a useful breeding material for improving pasting and retrogradation properties in sweet potato starch. 相似文献
110.
The hydrogenation of CO over an Rh vanadate (RhVO4) catalyst supported on SiO2 (RhVO4/SiO2) has been investigated after H2 reduction at 500°C, and the results are compared with those of vanadia-promoted (V2O5–Rh/SiO2) and unpromoted Rh/SiO2 catalysts. The mean size of Rh particles, which were dispersed by the decomposition of RhVO4 after the H2 reduction, was smaller (41 Å) than those (91–101 Å) of V2O5–Rh/SiO2 and Rh/SiO2 catalysts. The RhVO4/SiO2 catalyst showed higher activity and selectivity to C2 oxygenates than the unpromoted Rh/SiO2 catalyst after the H2 pretreatment. The CO conversion of the RhVO4/SiO2 catalyst was much higher than that of V2O5–Rh/SiO2 catalyst, and the yield of C2 oxygenates increased. We also found that the RhVO4/SiO2 catalyst can be regenerated by calcination or O2 treatment at high temperature after the reaction. 相似文献