全文获取类型
收费全文 | 483篇 |
免费 | 9篇 |
专业分类
电工技术 | 26篇 |
化学工业 | 63篇 |
金属工艺 | 22篇 |
机械仪表 | 24篇 |
建筑科学 | 14篇 |
能源动力 | 15篇 |
轻工业 | 55篇 |
水利工程 | 1篇 |
石油天然气 | 1篇 |
无线电 | 39篇 |
一般工业技术 | 68篇 |
冶金工业 | 115篇 |
原子能技术 | 6篇 |
自动化技术 | 43篇 |
出版年
2022年 | 8篇 |
2021年 | 12篇 |
2020年 | 4篇 |
2019年 | 1篇 |
2018年 | 6篇 |
2017年 | 7篇 |
2016年 | 11篇 |
2015年 | 3篇 |
2014年 | 6篇 |
2013年 | 23篇 |
2012年 | 15篇 |
2011年 | 19篇 |
2010年 | 14篇 |
2009年 | 11篇 |
2008年 | 15篇 |
2007年 | 20篇 |
2006年 | 17篇 |
2005年 | 5篇 |
2004年 | 14篇 |
2003年 | 11篇 |
2002年 | 14篇 |
2001年 | 19篇 |
2000年 | 13篇 |
1999年 | 22篇 |
1998年 | 49篇 |
1997年 | 26篇 |
1996年 | 16篇 |
1995年 | 13篇 |
1994年 | 12篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 8篇 |
1989年 | 7篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 10篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有492条查询结果,搜索用时 31 毫秒
71.
Tani Hiroshi Uesaraie Yuki Lu Renguo Koganezawa Shinji Tagawa Norio 《Microsystem Technologies》2018,24(11):4641-4648
Microsystem Technologies - In this study, the smear by the lubricant and siloxane pickup at the laser heating in the heat assisted magnetic recording (HAMR) was evaluated using our developed... 相似文献
72.
Rolling contact fatigue of alumina ceramics sprayed on steel roller under pure rolling contact condition 总被引:4,自引:1,他引:4
Masahiro Fujii Akira Yoshida Jiabin Ma Sadato Shigemura Kazumi Tani 《Tribology International》2006,39(9):856-862
The rolling contact fatigue of sprayed alumina ceramics with a nominal composition of Al2O3–2.3 mass% TiO2 was studied with a two-roller test machine under a pure rolling contact condition with oil lubricant. The influence of undercoating of sprayed Ni-based alloy on the rolling contact fatigue was investigated. The failure mode of all sprayed rollers was spalling caused by subsurface cracking. The undercoating did not contribute to the improvement of the rolling contact fatigue life. The elastic modulus of the alumina sprayed layer evaluated with the nano-indentation method was around 85 GPa. The depths of the observed subsurface cracks corresponded approximately to the depths where the orthogonal shear stress or the maximum shear stress calculated with two-dimensional FEM became maximum. 相似文献
73.
Theoretical analyses are presented for the linear free vibration of a clamped-free cylindrical shell partially filled with an incompressible, inviscid liquid. For the vibration of the shell itself, the dynamic version of the Donnell equations was used and the problem was solved with the modified Galerkin procedure, taking the effect of the axisymmetric deformation due to the static liquid pressure into consideration. Concerning the vibration relevant to the liquid motion, the solution for the velocity potential was assumed as a sum of two sets of linear combinations of the suitable harmonic function, the unknown parameters of which were imposed to satisfy both boundary conditions along the wetted shell wall and the free liquid surface in a sense of appropriate series expansions. The procedure stated in the foregoing leads to a determinantal equation for the determination of the natural frequencies of the present shell-liquid system. To compare with the experimental results which will be stated in a companion paper,14 detailed numerical results will be presented in another companion paper13 on the free vibration characteristics of the two test cylinders partially filled with water. 相似文献
74.
The magnesium composites containing Zr2(WO4)(PO4)2 (ZWP) particles with negative thermal expansion (NTE) were synthesized. Dense, unreacted Mg/ZWP composites were fabricated by extruding the two component powders. The coefficient of thermal expansion (CTE) and the mechanical properties of the composites were examined. The CTE of Mg/ZWP composites decreased with an increase in the amount of ZWP in the composites, though the effect was not significant probably because of the low bulk modulus of ZWP. Although there was a tension–compression asymmetry in the room temperature yield strength of Mg without ZWP, the difference reduced in the composites. The decreased asymmetry of yield behavior was suggested to be resulting from the tensile residual stress in the matrix produced during fabrication process because of the NTE of ZWP. 相似文献
75.
Yoshikazu Kitajyo Yoko Sakai Hirofumi Tani Atsushi Narumi Noriaki Kaneko Toyoji Kakuchi 《Polymer》2007,48(5):1237-1244
The synthesis of a novel unimolecular reverse micelle, the hyperbranched d-glucan carbamate (3), was accomplished through the carbamation reaction of the hyperbranched d-glucan (1) with the N-carbonyl l-leucine ethyl ester (2) in pyridine at 100 °C. Polymer 3 was soluble in a large variety of organic solvents, such as methanol, acetone, chloroform, and ethyl acetate, and insoluble in water, which remarkably differed from the solubility of 1. The degree of carbamate substitution (DS) for 3 was controlled by the feed rate of 2, and the DS values were in the range of 46.0-93.7%. Polymer 3 possessed the encapsulation ability for water-soluble molecules, such as rose bengal, thymol blue, and alizarin yellow in chloroform, and the encapsulation ability depended on the hydrophilicity of 3 and the molecular size of the dye. The rose bengal (RB) encapsulated polymer (RB/3) showed a slow release from the RB/3 system into water at neutral pH, while the release rate was significantly accelerated by the hydrolysis of the hydrophobic polymer shell under basic conditions. 相似文献
76.
Seiichiro Tani Mitsuo Teramoto Tomoo Fukazawa Kazuyoshi Matsuhiro 《Journal of Electronic Testing》1999,15(1-2):75-85
In this paper, we introduce a way of modeling the differences between the calculated delays and the real delays, and propose an efficient path selection method for path delay testing based on the model. Path selection is done by judging which of two paths has the larger real delay by taking into account the ambiguity of calculated delay, caused by imprecise delay modeling as well as process disturbances. In order to make precise judgment under this ambiguity, the delays of only the unshared segments of the two paths are evaluated. This is because the shared segments are presumed to have the same real delays on both paths.The experiments used the delays of gates and interconnects, which were calculated from the layout data of ISCAS85 benchmark circuits using a real cell library. Experimental results show the method selects only about one percent of the paths selected by the most popular method. 相似文献
77.
78.
79.
Qingshan Zhu Kazuhisa Shobu Eiji Tani Kazushi Kishi Seiki Umebayashi 《Journal of the American Ceramic Society》1999,82(8):2276-2278
Molybdenum carbosilicide composites (SiC-Mo≤5 Si3 C≤1 ) were fabricated via the melt-infiltration process. The fracture behavior of the composites was studied from room temperature up to 1800°C in 1 atm (∼105 Pa) of argon. The bend strength of the composites slightly increased at ∼1200°C, because of the brittle-ductile transition of the intermetallic phase. The composites retained ∼90% of their room-temperature strength, even at 1700°C. Compressive creep tests were performed over a temperature range of 1760°-1850°C and a stress range of 200–250 MPa. The creep rate of the SiC-Mo≤5 Si3 C≤1 composites was approximately an order of magnitude higher than that of reaction-bonded SiC. 相似文献
80.
Takao Kumazawa Masahiro Hotta Shinichi Sugiyama Toshinari Hashizume Tsuneo Tani 《Electrical Engineering in Japan》2000,130(2):49-58
Water trees are the most hazardous factor affecting the life of XLPE distribution cables and the major cause of insulation failure. It is well known that insulation failure causes stoppages in electrical service and requires extensive repair work. Up to now, deterioration of cable insulation has been diagnosed mainly by the dc leakage current method. However, application of this method for diagnostic measurements requires interruption of electrical service. Several types of hot‐line diagnostic methods (including the dc component current and dc superposition methods) were developed to detect water tree deterioration. However, these methods have some shortcomings, such as being subject to effects of stray currents and the accuracy of measurements not being sufficiently high. Therefore, we have attempted to develop a new hot‐line diagnostic method. We investigated whether the signals produced by superposition of voltages of various frequencies to the cover layer of energized cables were correlated with deterioration by the water treeing. As a result, we found that a deterioration signal of 1 Hz was observed when we superposed an ac voltage (commercial frequency × 2 +1 Hz) on the cover layer of cable where the water tree had occurred in the insulation. © 1999 Scripta Technica, Electr Eng Jpn, 130(2): 49–58, 2000 相似文献