全文获取类型
收费全文 | 788篇 |
免费 | 10篇 |
国内免费 | 7篇 |
专业分类
电工技术 | 44篇 |
综合类 | 3篇 |
化学工业 | 227篇 |
金属工艺 | 24篇 |
机械仪表 | 13篇 |
建筑科学 | 13篇 |
能源动力 | 28篇 |
轻工业 | 61篇 |
石油天然气 | 2篇 |
无线电 | 82篇 |
一般工业技术 | 120篇 |
冶金工业 | 51篇 |
原子能技术 | 30篇 |
自动化技术 | 107篇 |
出版年
2022年 | 6篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 12篇 |
2013年 | 39篇 |
2012年 | 21篇 |
2011年 | 33篇 |
2010年 | 15篇 |
2009年 | 35篇 |
2008年 | 38篇 |
2007年 | 28篇 |
2006年 | 37篇 |
2005年 | 28篇 |
2004年 | 28篇 |
2003年 | 43篇 |
2002年 | 37篇 |
2001年 | 16篇 |
2000年 | 11篇 |
1999年 | 17篇 |
1998年 | 35篇 |
1997年 | 22篇 |
1996年 | 29篇 |
1995年 | 24篇 |
1994年 | 17篇 |
1993年 | 19篇 |
1992年 | 15篇 |
1991年 | 19篇 |
1990年 | 14篇 |
1989年 | 12篇 |
1988年 | 8篇 |
1987年 | 19篇 |
1986年 | 14篇 |
1985年 | 15篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1982年 | 8篇 |
1981年 | 4篇 |
1980年 | 10篇 |
1979年 | 4篇 |
1978年 | 5篇 |
1977年 | 10篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1973年 | 2篇 |
排序方式: 共有805条查询结果,搜索用时 15 毫秒
731.
Minoru Tsuda Setsuko Oikawa Mitsuo Yabuta Akira Yokota Hisashi Nakane Nobufumi Atoda Koichiro Hoh Kenjj Gamo Susumu Namba 《Polymer Engineering and Science》1986,26(16):1148-1152
Dry developable resists comprised of poly(methyl isopropenyl ketone) (PMIPK) and 4-methyl-2,6-dI-(4′-azldoben-zylidene)-cyclohexanone-1 gave excellent results in SK lithography, i. e., high aspect ratio resist patterns with vertical walls were easily obtained by maskless dry etching in the single layer resist process. Because of the simplicity of single layer resist processing and the high etch rate in maskless dry etching for the formation of thick resist patterns, the dry developable resist in SR lithography may be advantageous to the multilayer resist for the purpose of generating high resolution, thick resist patterns with vertical walls. The resolution limit of the dry developable resist which reproduces the designed dimensions was 100 nm line and 200 nm space when a conventional e-beam apparatus was used at 20 KV in the dry developable multilayer resist process. 相似文献
732.
在日本漆器及漆器加工在绳纹文化时期(约开始于6300B.P.,即约5300B.C.)开始普及。漆树(Toxicodendron vernicifluum)被认为是史前从中国作为植物引入,一直在日本种植生长,但是一直没有这方面的考古证据,直至2004年这种漆树与本土的(Toxicodendron)树种的木材结构的被明确区... 相似文献
733.
Yukio Watanabe Ikurou Kawai Akira Kowada Shodo Akita Yoshitetsu Itou Youichi Sono Mitsuo Koyanagi Mikio Yamamoto 《Nuclear Engineering and Design》2000,200(3):337-351
In Japan, the following five plants in operation use prestressed concrete containment vessels (PCCVs): Tsuruga #2 (in operation in 1987), Ohi #3 and #4 (in operation in 1991 and 1993, respectively), and Genkai #3 and #4 (in operation in 1994 and 1997, respectively). These plants have adopted the hemispherical dome type PCCV with two or three buttresses and unbonded prestressing system. For the above five PCCVs, lift-off tests in the in-service inspection have been carried out 1, 3 and 5 years after the beginning of operation. In addition, concrete strain and temperature have been measured periodically. This paper presents the in-service inspection methods and results of the lift-off tests and the measurement of concrete strain. The given results are as follows. Measured strain shows good agreement with calculated creep and shrinkage strain, so tendon tensile force can be predicted by the design method using calculated strain, and it also matches well the results of the lift-off tests. 相似文献
734.
We proposed a technique of analysis that supports the optimization of layouts for vacuum insulation panels (VIPs) for refrigerators, using a one‐dimensional technique of calculation to simulate the heat loss caused by VIP envelope materials. VIP thermal characteristics were described by approximating system efficiency by using the panels' average length (Lp). We compared this simplified method to three‐dimensional numerical analysis of 1 to 6µm thick, vacuum‐packed aluminum foil and 1.5 to 6 mW/mK thermally conductive heat‐insulated core materials, and verified them to be within a 1% margin of error. © 2006 Wiley Periodicals, Inc. Heat Trans Asian Res, 35(7): 451–463, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20132 相似文献
735.
Chiung Moon Yoonho Seo Youngsu Yun Mitsuo Gen 《Journal of Intelligent Manufacturing》2006,17(4):509-522
A main function for supporting global objectives in a manufacturing supply chain is planning and scheduling. This is considered
such an important function because it is involved in the assignment of factory resources to production tasks. In this paper,
an advanced planning model that simultaneously decides process plans and schedules was proposed for the manufacturing supply
chain (MSC). The model was formulated with mixed integer programming, which considered alternative resources and sequences,
a sequence-dependent setup and transportation times.The objective of the model was to analyze alternative resources and sequences
to determine the schedules and operation sequences that minimize makespan. A new adaptive genetic algorithm approach was developed
to solve the model. Numerical experiments were carried out to demonstrate the efficiency of the developed approach.
Received: June 2005 / Accepted: December 2005 相似文献
736.
Integrated data structure and scheduling approach for manufacturing and transportation using hybrid genetic algorithm 总被引:3,自引:1,他引:2
Azuma Okamoto Mitsuo Gen Mitsumasa Sugawara 《Journal of Intelligent Manufacturing》2006,17(4):411-421
The scheduling systems in industries are required to construct schedule considering many kind of elements. The Advanced Planning
and Scheduling (APS) is an approach for combined problems. To realize APS system, it is important to integrate data structure
and scheduling algorithm using these data. In this paper, we propose integrated data structure based on Bill of Manufacturing
with information technology of XML family and new Multistage Operation-based Genetic Algorithm for scheduling subsystem. The
results of numerical experiment validate effectiveness of the proposal methods.
Received: June 2005/Accepted: December 2005 相似文献
737.
Wataru Tamura Osamu Itoh Nugraha Ken Suto Jun-Ichi Nishizawa 《Journal of Electronic Materials》1999,28(7):907-911
Electroluminescence properties of PbTe pn junctions grown under various tellurium vapor pressures are investigated. For unintentionally
doped pn junctions, the luminescence bands corresponding to D-A pair and band to band transition are observed. The luminescence
intensity of the band to band transition has depended on tellurium vapor pressure, which suggests nonradiative transitions
through nonstoichiometric defects forming deep levels. For pn junctions with Bi-doped epitaxial layers, only one peak appears
at 20∼25 meV below band to band-transition energy, which, probably, shows recombination through impurity levels or impurity
band originating from Bi-doping. 相似文献
738.
The commercial potential of MIM titanium alloy 总被引:2,自引:0,他引:2
739.
The pitting corrosion of SUSU304 steel can be suppressed by the application of a 19.5 kHz ultrasound (US) in 3.5% NaCl aqueous solution. At a constant vibrator-to-specimen distance of d = 76 mm equal to the wavelength, the suppression effect increased with the input power to vibrator and the largest effect was obtained at the power of I = 8. At constant input powers of I = 2 or 8, the suppression effect decreased with the increase in the vibrator-to-specimen distance, but the largest effect was obtained at d = 68 mm in each case of I = 2 and 8. 相似文献
740.
Antifeedants to Armyworms, Spodoptera lituraand Pseudaletia separata,from Bitter Gourd Leaves, Momordica charantia 总被引:2,自引:0,他引:2
Bitter gourd, Momordica charantia, was less palatable to two species of armyworms, Spodoptera litura and Pseudaletia separata, than two other cucurbitaceous plants. A methanol extract of M. charantia leaves inhibited feeding of the armyworm larvae. The two most active fractions obtained by silica gel chromatography were purified by HPLC. Momordicine II, a triterpene monoglucoside, was identified as an antifeedant compound from the more active of these fractions. The second active fraction led to the isolation of a new triterpene diglucoside. Fresh leaves of M. charantia contained ca. 0.3% of momordicine II. Momordicine II showed significant antifeedant effects on P. separata at concentrations of 0.02, 0.1, and 0.5% in artificial diets. Momordicine II caused a significant feeding reduction in S. litura only at the highest concentration (0.5%) tested. The difference in feeding response of the two armyworms to momordicine II may be related to the diversity in their host range. 相似文献