全文获取类型
收费全文 | 655篇 |
免费 | 12篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 52篇 |
综合类 | 1篇 |
化学工业 | 205篇 |
金属工艺 | 11篇 |
机械仪表 | 14篇 |
建筑科学 | 6篇 |
能源动力 | 19篇 |
轻工业 | 58篇 |
水利工程 | 2篇 |
无线电 | 38篇 |
一般工业技术 | 114篇 |
冶金工业 | 86篇 |
原子能技术 | 9篇 |
自动化技术 | 53篇 |
出版年
2023年 | 3篇 |
2022年 | 9篇 |
2021年 | 7篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 9篇 |
2016年 | 9篇 |
2015年 | 4篇 |
2014年 | 11篇 |
2013年 | 30篇 |
2012年 | 23篇 |
2011年 | 28篇 |
2010年 | 18篇 |
2009年 | 27篇 |
2008年 | 25篇 |
2007年 | 19篇 |
2006年 | 24篇 |
2005年 | 26篇 |
2004年 | 23篇 |
2003年 | 18篇 |
2002年 | 15篇 |
2001年 | 10篇 |
2000年 | 11篇 |
1999年 | 10篇 |
1998年 | 43篇 |
1997年 | 38篇 |
1996年 | 21篇 |
1995年 | 15篇 |
1994年 | 17篇 |
1993年 | 15篇 |
1992年 | 9篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 9篇 |
1988年 | 12篇 |
1987年 | 23篇 |
1986年 | 9篇 |
1985年 | 10篇 |
1984年 | 15篇 |
1983年 | 6篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1980年 | 7篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1975年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有668条查询结果,搜索用时 31 毫秒
41.
Masaharu Kamei Sumiko Ohgaki Tamotsu Kanbe Isao Niiya Haruo Mizutani Isao Matsui-Yuasa Shuzo Otani Shigeru Morita 《Lipids》1995,30(6):533-539
We investigated the relationship between dietary highly hydrogenated soybean oil (HSO) and cholesterol transport in rats.
In the first study, to examine the effects of cholesterol transport of different concentrations of HSO in dietary oil, rats
were given one of the three diets containing 0, 25, or 50% HSO in dietary oil with cholesterol (5 g/kg diet) or a diet without
HSO and cholesterol for 22 d. Feeding the high concentration of HSO prevented the increase in plasma total cholesterol, hepatic
total lipids, and cholesterol and the decrease in high-density lipoprotein-cholesterol, which were caused by dietary cholesterol.
Moreover, HSO increased the fecal excretion, fecal lipids, and steroids in a dose-dependent manner. In the second study, to
examine the effects on cholesterol transport of redistribution of stearic acid in the triacylglycerol species contained in
HSO, rats were given one of the six diets containing HSO (distearoylmonoacylglycerol and tristearoylglycerol)-rich, monostearoylglycerol-rich,
or palmitic acid-rich oil with/without cholesterol (5 g/kg diet), for 30 d. Whereas the accumulation of cholesterol in the
body was reduced, cholesterol excretion was enhanced effectively in rats given the HSO-rich diet compared with rats given
the monostearoylglycerol-rich diet. These results suggested that not only the high concentration of stearic acid but also
its uneven distribution in HSO-triacylglycerol contributed to the reduction in intestinal cholesterol absorption in rats. 相似文献
42.
Hideki Shige Toshitsugu Ishikawa Michio Suzukawa Masato Nishiwaki Takeshi Yamashita Kei Nakajima Toshimitsu Ito Kenji Higashi Makoto Ayaori Atsushi Yonemura Paul Nestel Haruo Nakamura 《Lipids》1998,33(12):1169-1175
The effects of vitamin E on cholesteryl ester (CE) metabolism in 1774 cells were examined. Pretreatment of 1774 cells with
vitamin E at concentrations above 50 μM significantly decreased acetylated low density lipoprotein (LDL)-induced incorporation
of [14C]oleate into CF in cells in a dose-dependent manner. This was partly due to vitamin E Also significantly inhibiting the uptake
of [3H]CE-labeled acetylated LDL by 1774 cells. A trend existed toward suppression of acyl-CoA:cholesterol acyltransferase (ACAT)
activity in the cell lysate at high vitamin E concentration, but there was no effect on hydrolysis of CE. These data indicate
that vitamin E reduces the uptake of modified LDL and suppresses ACAT activity, resulting in less cholesterol esterification
in macrophages; a novel mechanism underlying the antiatherogenic properties of vitamin E. 相似文献
43.
The importance of transparent conductive film is increasing due to its use in applications such as touch‐panel devices. Although indium tin oxide is widely used because of its high conductivity and transparency, conductive polymers are being studied as alternative materials that avoid the use of rare metals and the brittleness associated with existing systems. Polyethylene dioxythiophene (PEDOT)/polyethylene sulfonic acid (PSS) is drawing a lot of attention due to its well‐balanced conductivity, transparency, film formability, and chemical stability. The nonconductive PSS reportedly covers the conductive PEDOT. The PSS shell provides carrier and film‐formability to PEDOT but is also a barrier that hinders electrical conductivity. Therefore, the PEDOT film formability is explored supported by a substrate without the addition of PSS. The “hierarchical nanoporous layer glass” holds the PSS‐free PEDOT with its nanopores to form a homogeneous, transparent film. The PSS‐free PEDOT film thus achieves transparency of over 85% and resistivity of below 500 Ω sq?1. 相似文献
44.
Bo Zhu Jianchun Li Yong He Hideki Yamane Yoshiharu Kimura Haruo Nishida Yoshio Inoue 《应用聚合物科学杂志》2004,91(6):3565-3573
The phase behaviors for the blends of poly(3‐hydroxypropionate) (PHP), poly(L ‐lactide) (PLLA), poly(D ‐lactide) (PDLA), and poly(D,L ‐lactide) (PDLLA) with catechin were investigated by differential scanning calorimetry. In PLLA/catechin, PDLA/catechin, and PDLLA/catechin blends, two glass transitions were detected when the catechin content was ≥40 wt %, whereas in PHP/catechin blends only one glass transition was observed over the whole range of blend compositions. The former and the latter results should reflect the inhomogeneous and the homogeneous nature of the blends, respectively, in the amorphous phase. These different phase behaviors should arise from the differences in the chemical structures between PHP and PLLA/PDLA/PDLLA, which dominates the strength and the number of intermolecular hydrogen‐bonding interactions between the ester carbonyl groups of polyesters and the phenol groups of catechin. As detected by FTIR spectroscopy, in comparison with PHP, the steric hindrance of side‐chain methyl groups of PLLA, PDLA, and PDLLA might restrain the formation of hydrogen bonds between their ester carbonyl groups and the phenol hydroxyl groups of catechin, even weakening the strength of such hydrogen bonds. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3565–3573, 2004 相似文献
45.
Satoshi Someya Satoshi Yoshida Takahide Tabata Koji Okamoto 《International Journal of Heat and Mass Transfer》2009,52(19-20):4236-4243
The basic characteristics of the reacting mixing flow of two streams were investigated. The reaction between aqueous solutions of ammonia and acetic acid, which produces ammonium acetate, was investigated in terms of the effect on the fluid–fluid interface of the mixing flow relative to fluids that did not react. The reaction between these solutions was negligibly exothermic, and there were minimal differences in density. The velocity field in the reacting mixing flow was quantitatively measured using high-speed time-resolved particle image velocimetry (PIV) and the behavior of the mixing flow was qualitatively investigated using laser-induced fluorescence (LIF). The jet width, the velocity field, the kinetic energy and the turbulent intensities are qualitatively estimated and discussed. It was found that the chemical reaction resulted in the suppression of the mixing flow. 相似文献
46.
Hiroki Ishikawa Ryoko Komaki Haruo Naitoh Akira Yamaba Hiroki Katoh 《Electrical Engineering in Japan》2010,173(1):51-59
This paper presents a current control design for switched reluctance motors (SRMs). The electric transfer characteristic of the motors is studied first. Their transfer function is shown to be expressible by a pure resistive component, which is not constant but varies depending on the motor current and speed. The current control design for SRMs follows the classical design technique used for DC machines, where the zeros of the PI controller cancel the poles of Ls+R. Because the transfer function of SRMs does not have any poles, an I controller is suitable for them. The integral gain should be adjusted in order to compensate the nonlinearity, that is, the variation in the equivalent resistor of the SRMs' transfer function. The values of the integral gain are tuned and tabulated for the motor speed and current. Simulation and experiment demonstrate that the current and speed of the SRMs present good responses without dependence on the motor speed and current. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 173(1): 51–59, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20987 相似文献
47.
Teruhisa Horita Haruo Kishimoto Katsuhiko Yamaji Manuel E. Brito Yueping Xiong Harumi Yokokawa 《Journal of power sources》2009,193(1):180-184
Reactivity of oxide scale on Fe-Cr alloy with Na-containing gases was examined to estimate the stability against sodium (Na): vapors of NaCl and Na2SO4 exposures with air flow at 1073 K. The identified reaction phases were Cr-Mn spinel, Cr2O3, and alloy from the X-ray diffraction of surface with no Na-reaction products. However, the protective oxide scales (Mn-Cr spinel and Cr2O3 layers) on the Fe-Cr alloy were partially decomposed by reacting with Na to form Na-compounds inside the oxide scale/alloy interfaces. In some parts, anomalous oxide scales were found around the oxide scale/Fe-Cr alloy interfaces, with forming Na-rich compounds: the compounds were distributed inner parts of oxide scales around oxide scale/alloy interfaces. The stability of oxide scales and degradation were discussed based on the observed distribution of elements. 相似文献
48.
49.
Koji Sugano Yuki Uchida Osamu Ichihashi Hideo Yamada Toshiyuki Tsuchiya Osamu Tabata 《Microfluidics and nanofluidics》2010,9(6):1165-1174
Gold nanoparticles with diameters of a few tens of nanometer and a narrow size distribution were synthesized using a pulsed
mixing method with a microfluidic system which consists of a Y-shaped mixing microchannel and two piezoelectric valveless
micropumps. This mixing method enables control of the mixing speed of gold salts and reducing agent by changing the switching
frequency of the micropumps, which was our focus to improve the particle size distribution, which is an essential parameter
in gold nanoparticle synthesis. In the proposed method, the mixing time was inversely proportional to the switching frequency
and the minimum mixing time was 95 ms at a switching frequency of 200 Hz. During synthesis experiments, the mean diameter
of the synthesized gold nanoparticles was found to increase, and the coefficient of variation of particle size was found to
decrease with decreasing mixing time. We successfully improved the coefficient of variation to less than 10% for a mean diameter
of around 40 nm. 相似文献
50.
Noriya Izu Haruo Kishimoto Takahisa Omata Kousuke One 《Science and Technology of Advanced Materials》2013,14(2):397-404
Tetragonal CaF2-related-type t′-/Ce0.5Zr0.5)O2 phase was reduced at 773 K ≤ Tred. ≤ 1073 K to prepare precursors with various oxygen compositions: Ce2Zr2O712d /0.111 < δ < 0.379). Metastable tetragonal t′meta-(Ce0.5Zr0.5)O2 phases were prepared by oxidizing in O2 at 873 K the precursors, and subjected to evolved oxygen gas analysis by heating the samples at a constant rate. When the precursor was prepared at Tred: ? 773 K; i.e. δ ? 0:379; the oxygen release behavior of the tetragonal phase agreed approximately with that of the t′. For δ < 0.29, distinct features of the t′meta-(Ce0.5Zr0.5)O2 appeared in the XRD results and Raman spectra. The temperature exhibiting the maximum release rate of oxygen from the t′meta became lower with decreasing the d value. It could be concluded that the thermodynamic behavior of the t′meta is related closely to the precursor composition and becomes more unstable with decrease in the δ value. The t′ and t′meta phases with disordered arrangement of Ce and Zr ions may belong to the same space group; nevertheless, difference in the random arrays of the Ce and Zr ions was suggested on the basis of the present experimental results. 相似文献