全文获取类型
收费全文 | 577篇 |
免费 | 58篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 17篇 |
综合类 | 9篇 |
化学工业 | 90篇 |
金属工艺 | 17篇 |
机械仪表 | 26篇 |
建筑科学 | 53篇 |
矿业工程 | 1篇 |
能源动力 | 11篇 |
轻工业 | 68篇 |
水利工程 | 10篇 |
石油天然气 | 3篇 |
武器工业 | 1篇 |
无线电 | 46篇 |
一般工业技术 | 95篇 |
冶金工业 | 75篇 |
原子能技术 | 3篇 |
自动化技术 | 115篇 |
出版年
2023年 | 7篇 |
2022年 | 6篇 |
2021年 | 16篇 |
2020年 | 17篇 |
2019年 | 8篇 |
2018年 | 23篇 |
2017年 | 26篇 |
2016年 | 27篇 |
2015年 | 20篇 |
2014年 | 26篇 |
2013年 | 41篇 |
2012年 | 41篇 |
2011年 | 54篇 |
2010年 | 34篇 |
2009年 | 40篇 |
2008年 | 33篇 |
2007年 | 22篇 |
2006年 | 16篇 |
2005年 | 16篇 |
2004年 | 12篇 |
2003年 | 14篇 |
2002年 | 10篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 10篇 |
1998年 | 19篇 |
1997年 | 15篇 |
1996年 | 5篇 |
1995年 | 10篇 |
1994年 | 7篇 |
1993年 | 6篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1982年 | 4篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 8篇 |
1976年 | 7篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1968年 | 1篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1957年 | 1篇 |
1956年 | 1篇 |
排序方式: 共有640条查询结果,搜索用时 15 毫秒
1.
P. Lobotka I. Vávra Š. Gaži A. Plecenik J. Dérer 《Journal of Low Temperature Physics》1997,106(3-4):381-386
A Josephson junction Nb/Si/Nb with a 10 nm thick amorphous silicon barrier is studied. The upper electrode contains a 2 nm
thick sublayer of amorphous phase adjacent to the barrier, as revealed by cross-sectional TEM. Thus, the junction can be considered
as a S-I-N-S system with the N layer represented by amorphous niobium. Peculiarities in the I–V and Δ(T) dependencies are
observed and explained as a consequence of a proximity effect present in the upper electrode. 相似文献
2.
J. P. Emelianova P. V. Pakshin K. Gałkowski E. Rogers 《Automation and Remote Control》2014,75(5):845-858
This paper considers systems with two-dimensional dynamics (2D systems) described by the continuous-time nonlinear state-space Roesser model. The sufficient conditions of exponential stability in terms of vector Lyapunov functions are established. These conditions are then applied to analysis of the absolute stability of a certain class of systems comprising a linear continuous-time plant in the form of the Roesser model with a nonlinear characteristic in the feedback loop, which satisfies quadratic constraints. The absolute stability conditions are reduced to computable expressions in the form of linear matrix inequalities. The obtained results are extended to the class of continuous-time systems governed by the Roesser model with Markovian switching. The problems of absolute stability and stabilization via state- and output-feedback are solved for linear systems of the above class. The solution procedures for these problems are in the form of algorithms based on linear matrix inequalities. 相似文献
3.
树脂相分光光度法测定人发中痕量铜 总被引:1,自引:0,他引:1
研究了铜与钛铁试剂在pH=9.00的碱性介质中反应生成有色络合物,与717#强碱性阴离子交换树脂交换吸附,在树脂相下进行光度分析的方法。铜树脂相络合物的最大吸收波长为375um;表观摩尔吸光系数ε为6.4×104L·mol(-1)·cm(-1);符合Beer定律的范围为0~1.6mg·L(-1)。此法用于人发中痕量钢的测定,结果令人满意。 相似文献
4.
Boris Raymond Gaël Guennebaud Pascal Barla Romain Pacanowski Xavier Granier 《Computer Graphics Forum》2014,33(2):313-321
This paper introduces a system for the direct editing of highlights produced by anisotropic BRDFs, which we call anisotropic highlights. We first provide a comprehensive analysis of the link between the direction of anisotropy and the shape of highlight curves for arbitrary object surfaces. The gained insights provide the required ingredients to infer BRDF orientations from a prescribed highlight tangent field. This amounts to a non‐linear optimization problem, which is solved at interactive framerates during manipulation. Taking inspiration from sculpting software, we provide tools that give the impression of manipulating highlight curves while actually modifying their tangents. Our solver produces desired highlight shapes for a host of lighting environments and anisotropic BRDFs. 相似文献
5.
6.
7.
Carlos Gañán Jose L. Muñoz Oscar Esparza Jorge Mata-Díaz Juan Hernández-Serrano Juanjo Alins 《Journal of Network and Computer Applications》2013,36(5):1337-1351
Vehicular Ad Hoc Networks (VANETs) require mechanisms to authenticate messages, identify valid vehicles, and remove misbehaving vehicles. A public key infrastructure (PKI) can be used to provide these functionalities using digital certificates. However, if a vehicle is no longer trusted, its certificates have to be revoked and this status information has to be made available to other vehicles as soon as possible. In this paper, we propose a collaborative certificate status checking mechanism called COACH to efficiently distribute certificate revocation information in VANETs. In COACH, we embed a hash tree in each standard Certificate Revocation List (CRL). This dual structure is called extended-CRL. A node possessing an extended-CRL can respond to certificate status requests without having to send the complete CRL. Instead, the node can send a short response (less than 1 kB) that fits in a single UDP message. Obviously, the substructures included in the short responses are authenticated. This means that any node possessing an extended-CRL can produce short responses that can be authenticated (including Road Side Units or intermediate vehicles). We also propose an extension to the COACH mechanism called EvCOACH that is more efficient than COACH in scenarios with relatively low revocation rates per CRL validity period. To build EvCOACH, we embed an additional hash chain in the extended-CRL. Finally, by conducting a detailed performance evaluation, COACH and EvCOACH are proved to be reliable, efficient, and scalable. 相似文献
8.
Dworschák E Barna E Gergely A Czuczy P Hóvári J Kontraszti M Gaál O Radnóti L Bíró G Kaltenecker J 《Meat science》1995,39(1):79-86
A new pig genotype of Hungarian Large White (75%) × Mangalica (pig with curly bristles, 25%) was used in the experiments. The experimental group was kept in a farming system under strictly natural circumstances until a body weight of 120 kg was attained. Neither antibiotics nor yield-increasing hormones were given to this group. The control group was kept in the usual large-scale farming conditions until body weight of 120 kg was attained. In most cases, protein, zinc, and copper levels and, in some cases, iron levels were significantly higher in some major cuts (neck-end (Boston-butt), loin, ham) of the 'free-range' pigs (n = 12) in comparison with the control animals kept in large-scale farming conditions. There was, on average, 15% less cholesterol in the muscles and 30% less cholesterol in the liver and less linoleic acid in all tissues of 'free-range' pigs than in the control group. There was less fat, but the amount of thiamin and riboflavin in the liver of the naturally kept pigs was twice that in the controls. In respect of TBA-reactive compounds, there were no significant differences between the two groups, but superoxide dismutase (SOD) showed significantly higher activities in all cuts from pigs kept in a large-scale farming system. This may be the effect of a higher level of linoleic acid in the fat. 相似文献
9.
Jeanne Volatron Florent Carn Jelena Kolosnjaj‐Tabi Yasir Javed Quoc Lam Vuong Yves Gossuin Christine Ménager Nathalie Luciani Gaëlle Charron Miryana Hémadi Damien Alloyeau Florence Gazeau 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(2)
Proteins implicated in iron homeostasis are assumed to be also involved in the cellular processing of iron oxide nanoparticles. In this work, the role of an endogenous iron storage protein—namely the ferritin—is examined in the remediation and biodegradation of magnetic iron oxide nanoparticles. Previous in vivo studies suggest the intracellular transfer of the iron ions released during the degradation of nanoparticles to endogenous protein cages within lysosomal compartments. Here, the capacity of ferritin cages to accommodate and store the degradation products of nanoparticles is investigated in vitro in the physiological acidic environment of the lysosomes. Moreover, it is questioned whether ferritin proteins can play an active role in the degradation of the nanoparticles. The magnetic, colloidal, and structural follow‐up of iron oxide nanoparticles and proteins in lysosome‐like medium confirms the efficient remediation of potentially harmful iron ions generated by nanoparticles within ferritins. The presence of ferritins, however, delays the degradation of particles due to a complex colloidal behavior of the mixture in acidic medium. This study exemplifies the important implications of intracellular proteins in processes of degradation and metabolization of iron oxide nanoparticles. 相似文献
10.
A. M. Gañán-Calvo C. Ferrera M. Torregrosa M. A. Herrada M. Marchand 《Microfluidics and nanofluidics》2011,11(1):65-74
The internal motions inside a liquid meniscus in the so-called liquid cone-jet mode, which can occur upon stimulation by a
coflowing gas sheath in flow focusing, are explored by both numerical simulation and experimental visualization. The results
for low viscosity liquids show that, as in previous numerical simulations, a recirculating cell inside the meniscus appears
when the injected liquid flow rate is reduced. Thus, as the flow rate is reduced not only the average residence time of particles
in the meniscus becomes longer, but the appearance of a recirculation cell provides a natural platform for the efficient micro-mixing
of different species before they are ejected through the issuing jet. The numerical results were confirmed with experimental
visualization of the flow inside the meniscus using a dyed liquid. However, when the viscosity of the liquid is increased
the recirculating cell disappears. In this case, viscous stresses organize the streamlines and direct the flow to the meniscus
tip, which prevents the recirculating cell from being formed even for very small injected rate of liquid flow. 相似文献