全文获取类型
收费全文 | 170篇 |
免费 | 2篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 24篇 |
金属工艺 | 29篇 |
机械仪表 | 4篇 |
能源动力 | 1篇 |
轻工业 | 10篇 |
无线电 | 6篇 |
一般工业技术 | 36篇 |
冶金工业 | 49篇 |
原子能技术 | 1篇 |
自动化技术 | 11篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2014年 | 2篇 |
2013年 | 7篇 |
2012年 | 6篇 |
2011年 | 6篇 |
2010年 | 6篇 |
2009年 | 12篇 |
2008年 | 7篇 |
2007年 | 7篇 |
2006年 | 15篇 |
2005年 | 10篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 6篇 |
1998年 | 9篇 |
1997年 | 5篇 |
1996年 | 8篇 |
1995年 | 14篇 |
1994年 | 7篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 4篇 |
1970年 | 1篇 |
排序方式: 共有176条查询结果,搜索用时 15 毫秒
1.
2.
Hiroshi Ito Takehiko Ishiguro Tokutaro Komatsu Nozomu Matsukawa Gunzi Saito Hiroyuki Anzai 《Journal of Superconductivity and Novel Magnetism》1994,7(3):667-669
The superconducting transition of the organic compoundsκ-(BEDT-TTF)2 X is studied by resistive measurement in a magnetic field up to 10 T applied normal to the conducting plane. For the salts withX=Cu[N(CN)2]Br andX=CuCN[N(CN)2] the transition shows fanshaped broadening caused by superconductivity fluctuation. For theX=Cu(NCS)2 salt the resistivity shows a peak in the transition region in a magnetic field below 4 T.This phenomenon is suppressed in defect-reduced samples for intralayer conduction. We discuss this peak in relation to the thermal fluctuation on the Josephson junction structures in this salt. 相似文献
3.
Pressure effects on the low temperature state of the α-(BEDT-TTF)2MHg(SCN)4 organic conductor family
X. Chen J. S. Brooks S. Valfells G. J. Athas S. J. Klepper M. Tokumoto N. Kinoshita H. Anzai Y. Tanaka 《Synthetic Metals》1995,70(1-3)
Systematic magnetotransport measurements as a function of hydrostatic pressure have been made on four members of the α-(BEDT-TTF)2MHg(SCN)4 organic conductor family (M = K, Tl, Rb, NH4). Applied pressure above about 6 Kbar removes the density wave state for M = K, Tl, and Rb. For M = NH4 the superconducting state is removed with pressure as dTc/dP = − 0.25 K/Kbar. In all cases the Shubnikov de Haas oscillation frequency increases with pressure, including the β orbit (which involves the entire Brillouin zone), and new orbits involving very small fractions of the Fermi surface are formed. 相似文献
4.
Recently, various robots with many degrees of freedom, such as rescue robots and domestic robots, have been developed and
used in practical applications. It is difficult to control such robots autonomously in real environments, because in order
to control the many degrees of freedom, we have to observe many states, calculate huge amounts of information, and operate
many actuators. In this study, we consider a flexible robot without sensors or controllers that can determine the inclination
of a slope and climb up the slope. In order to demonstrate the effectiveness of the proposed framework, we have developed
a prototype robot and conducted experiments. The result indicates that the robot could determine the inclination and climb
up a gentle slope autonomously. Thus, we have realized an autonomous robot that has no explicit sensors or controllers. 相似文献
5.
S. Takahashi A. Betancur-Rodiguez S. Hill S. Takasaki J. Yamada H. Anzai 《Journal of Low Temperature Physics》2006,142(3-4):311-314
We report high-resolution angle-dependent measurements of the Periodic Orbit Resonance (POR) effect in (TMTSF)2ClO4. We observe additional harmonic resonances that were not observed in previous studies. By measuring over a broad range of
frequency, field, and field orientation, we find that all of the POR evolve from the Lebed magic angles observed in dc (ω=0)
AMRO measurements. However, we find that the resonance angles vary with frequency in a manner that can easily be explained
using a semiclassical model. This indicates that these angles are not ‘magic’ at frequencies on the order of the cyclotron
frequency. 相似文献
6.
Four benzoic acid derivatives and three phenylpropanoids were tested for their ability to suppress oxidation of dichlorodihydrofluorescein (DCDHF) induced by 3-morpholinosydnonimine (SIN-1, a peroxynitrite donor). Ellagic acid was found to potently inhibit this oxidation and to inhibit oxidation of DCDHF induced by peroxynitrite itself. Moreover, this compound prevented peroxynitrite-induced oxidative single strand breaks in pTZ 18U plasmid DNA and nitration of tyrosyl residues in bovine serum albumin. These results show that ellagic acid protects biomolecules against oxidative and nitrative damage induced by peroxynitrite in vitro. 相似文献
7.
Co-Ni-Al合金不仅可以作为铁磁性形状记忆合金,也是传统和高温形状记忆合金的候选材料,本文通过金相显微分析,DSC和VSM方法,研究了Co40Ni33.5Al26.5合金马氏体相变和Curie点随淬火温度变化的情况,结果发现该合金马氏体相变温度和Curie点与淬火温度成正比关系.马氏体相变的4种温度,即Ms、Mf、As和At基本平行变化,淬火温度每升高10℃,马氏体相变温度升高8~9℃,而Curie点升高6~7℃.其马氏体相变温度和Curie点随淬火温度的变化与基体相β的成分变化有关,β相中Al的含量随淬火温度升高而降低,因而马氏体相变温度和Curie点升高.并且发现随着淬火温度升高,Co40Ni33.5Al26.5合金马氏体相的磁晶各向异性有减弱的倾向. 相似文献
8.
Avidin-containing polyelectrolyte microcapsules were prepared by a layer-by-layer deposition technique and uptake and release
of biotin-labelled fluorescein (b-FITC) was studied. The polyelectrolyte microcapsules were prepared by coating the surface
of calcium carbonate (CaCO3) microparticles containing avidin-poly(styrene sulfonate) (PSS) conjugate, followed by dissolution of CaCO3 core in an ethylenediaminetetraacetic acid solution. Release of avidin from the microcapsules was markedly suppressed due
to formation of a high molecular weight of avidin-PSS conjugate in the microcapsules. The uptake of b-FITC into the microcapsules
was highly enhanced through a strong binding of b-FITC to avidin, as compared to the uptake into avidin-free microcapsules.
Release of b-FITC from the microcapsules was accelerated upon addition of biotin, 2-iminobiotin, or lipoic acid in the solution
due to the competitive binding of the additives to the binding site of avidin. 相似文献
9.
10.
Phase equilibria and thermodynamic properties of the KCl–K2CO3–NaCl–Na2CO3 system were analyzed on the basis of the thermodynamic evaluation of the KCl–NaCl,KCl–K2CO3,NaCl–Na2CO3,K2CO3–Na2CO3 and KCl–K2CO3–NaCl–Na2CO3 systems. The Gibbs energies of individual phases was approximated by two-sublattice models for ionic liquids and crystals. Most of the experimental information was well described by the present set of thermodynamic parameters. The lowest monovariant eutectic temperature in the KCl–NaCl–Na2CO3 system is located at 573 °C, with a composition of XNa2CO3=0.31,XKCl=0.35 and XNaCl=0.34. 相似文献