全文获取类型
收费全文 | 584篇 |
免费 | 15篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 50篇 |
综合类 | 2篇 |
化学工业 | 164篇 |
金属工艺 | 13篇 |
机械仪表 | 18篇 |
建筑科学 | 10篇 |
能源动力 | 21篇 |
轻工业 | 61篇 |
水利工程 | 2篇 |
无线电 | 35篇 |
一般工业技术 | 109篇 |
冶金工业 | 25篇 |
原子能技术 | 14篇 |
自动化技术 | 79篇 |
出版年
2022年 | 3篇 |
2021年 | 9篇 |
2020年 | 8篇 |
2019年 | 7篇 |
2018年 | 14篇 |
2017年 | 8篇 |
2016年 | 8篇 |
2015年 | 3篇 |
2014年 | 7篇 |
2013年 | 31篇 |
2012年 | 29篇 |
2011年 | 37篇 |
2010年 | 30篇 |
2009年 | 28篇 |
2008年 | 26篇 |
2007年 | 27篇 |
2006年 | 21篇 |
2005年 | 31篇 |
2004年 | 20篇 |
2003年 | 26篇 |
2002年 | 16篇 |
2001年 | 13篇 |
2000年 | 12篇 |
1999年 | 12篇 |
1998年 | 11篇 |
1997年 | 13篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 8篇 |
1993年 | 12篇 |
1992年 | 7篇 |
1991年 | 10篇 |
1989年 | 10篇 |
1988年 | 7篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 8篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1980年 | 7篇 |
1979年 | 4篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1973年 | 3篇 |
1972年 | 2篇 |
1971年 | 3篇 |
1968年 | 2篇 |
1967年 | 2篇 |
排序方式: 共有603条查询结果,搜索用时 31 毫秒
81.
Tzanakaki Anna Varvarigos Emmanouel Muñoz Raul Nejabati Reza Yoshikane Noboru Anastasopoulos Markos 《Photonic Network Communications》2020,40(3):123-125
Photonic Network Communications - 相似文献
82.
83.
One often encounters numerical difficulties in solving linear matrix inequality (LMI) problems obtained from H ∞ control problems. For semidefinite programming (SDP) relaxations for combinatorial problems, it is known that when either an SDP relaxation problem or its dual is not strongly feasible, one may encounter such numerical difficulties. We discuss necessary and sufficient conditions to be not strongly feasible for an LMI problem obtained from H ∞ state feedback control problems and its dual. Moreover, we interpret the conditions in terms of control theory. In this analysis, facial reduction, which was proposed by Borwein and Wolkowicz, plays an important role. We show that the dual of the LMI problem is not strongly feasible if and only if there exist invariant zeros in the closed left-half plane in the system, and present a remedy to remove the numerical difficulty with the null vectors associated with invariant zeros in the closed left-half plane. Numerical results show that the numerical stability is improved by applying it. 相似文献
84.
Xu Sugang Yoshikane Noboru Shiraiwa Masaki Tsuritani Takehiro Zhang Xiaocheng Awaji Yoshinari Wada Naoya 《Photonic Network Communications》2020,40(3):175-193
Photonic Network Communications - To achieve fast recovery of optical transport networks after a disaster, we investigate a novel scheme enabling cooperation between carriers. Carriers can take... 相似文献
85.
We deal with H∞ state feedback control problem for the multi‐input‐multi‐output (MIMO) servo system and discuss the advantages of the facial reduction (FR) to the resulting linear matrix inequality (LMI) problems. In fact, as far as our usual setting, the dual of the LMI problem is not strictly feasible because the generalized plant has always stable invariant zeros. Thus FR is available to such LMI problems, and we can reduce and simplify the original LMI problem to a smaller‐size LMI problem. As a result, we observe that the numerical performance of the SDP solvers is improved. Also, as a by‐product, we obtain the best performance index of the reduced LMI problem with a closed‐form expression. This helps the H∞ performance limitation analysis. Another contribution is to reveal that the resulting LMI problem obtained from H∞ control problem has a finite optimal value, but no optimal solutions under an additional assumption. This is also confirmed in the numerical experiment of this paper. FR also plays an essential role in this analysis. 相似文献
86.
Noboru Moriyama 《Journal of the American Oil Chemists' Society》1975,52(6):198-203
The effects of various types of surfactants and inorganic phosphates upon the apparent viscosities of pigment-water (50/50) suspensions are examined. The additions of surfactants or inorganic phosphates to the pigment-water suspensions depress the apparent viscosities from the values of more than 10,000 centipoise to those of ca. 10 centipoise. The concentration of surfactants or inorganic phosphates required to depress the apparent viscosity depends upon the chemical composition and the mol wt of surfactants or inorganic phosphates. The effects are correlated with zeta potential, adsorption, and pH data. 相似文献
87.
The insect cell-baculovirus expression vector system, widely used for glycoprotein production, is not ideal for pharmaceutical glycoprotein production due to the characteristics of the N-glycans in the expressed products. Insect cells lack several enzymes required for mammalian-type N-glycan synthesis and contain a specific N-acetylglucosaminidase that stunts the growth of chains and a core alpha-1,3-fucosyltransferase that yields potentially allergenic glycoforms. Current knowledge on N-glycan processing in lepidopteran insect cells is summarized, and strategies to develop better glycoprotein expression systems suitable for pharmaceutical glycoprotein production are discussed. 相似文献
88.
Energy value and digestibility of dietary oil containing mainly 1,3-diacylglycerol are similar to those of triacylglycerol 总被引:15,自引:7,他引:15
Diacylglycerol (DAG) is a component of various vegetable oils. Approximately 70% of the DAG in edible oils are in the configuration
of 1,3-DAG. We recently showed that long-term ingestion of dietary oil containing mainly 1,3-DAG reduces body fat accumulation
in humans as compared to triacylglycerol (TAG) oil with a similar fatty acid composition. As the first step to elucidate the
mechanism for this result, we examined the difference in the bioavailabilities of both oils by measuring food energy values
and digestibilities in rats. Energy values of the DAG oil and the TAG oil, measured by bomb calorimeter, were 38.9 and 39.6
kJ/g, respectively. Apparent digestibility expressed according to the formula: (absorbed) x (ingested)−1x100=(ingested—excreted in feces)x(ingested)−1x100 for the DAG oil and the TAG oil were 96.3±0.4 and 96.3±0.3% (mean±SEM), respectively. The similarity in the bioavailabilities
of both oils supports the hypothesis that the reduced fat accumulation by dietary DAG is caused by the different metabolic
fates after the absorption into the gastrointestinal epithelial cells. 相似文献
89.
Keiji Izumi Megumi Murakami Takenori Deguchi Arihiko Morita Noboru Tohge Tsutomu Minami 《Journal of the American Ceramic Society》1989,72(8):1465-1468
The stability and the coating characteristics of a variety of organozirconium compounds have been investigated to coat ZrO2 films on stainless steets for the improvement of heat resistance against oxidation. Zirconium tetraoctylate and zirconium tetrakis(acetylacetonate) were found to be more stable than zirconium alkoxides in an ambient atmosphere. The ZrO2 films from zirconium alkoxides became white and discontinuous when the thickness of the films exceeded about 200 Å (20 nm). On the other hand, transparent ZrO2 films were obtained from zirconium tetraoctylate and zirconium tetrakis(acetylacetonate). The IR spectra of the films showed that the heat treatment at 400°C for 5 min produced organic-free ZrO2 films. The heat resistance of stainless steel sheets against oxidation was improved by the ZrO2 coating, depending on the film thickness. 相似文献
90.
Fire Safety Performance of Japanese Traditional Wood/Soil Walls and Implications for the Restoration of Historic Buildings in Urban Districts 总被引:2,自引:0,他引:2
Yuji Hasemi Noboru Yasui Michitaka Akizuki Koichi Kinoshita Koichi Yamamoto Masatomo Yoshida Yoshihide Tamura Mariko Takeda 《Fire Technology》2002,38(4):391-402
Grass-root research activities to clarify fire safety performance of Japanese traditional wooden construction are introduced. The activities aim to resolve conflict between the restoration of historic buildings and the reduction of risk and hazard of urban fires. Among various activities, scope and results of fire resistance tests on traditional soil wall assemblies supported by timber frame are reported in detail. The test results indicate an encouraging prospect for the rational fire safety assessment of historic buildings and further development of fire-safe traditional constructions for the restoration of historic buildings and historic urban districts. 相似文献