首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   859篇
  免费   44篇
  国内免费   1篇
电工技术   12篇
化学工业   144篇
金属工艺   30篇
机械仪表   29篇
建筑科学   20篇
矿业工程   1篇
能源动力   19篇
轻工业   156篇
水利工程   1篇
石油天然气   1篇
无线电   44篇
一般工业技术   152篇
冶金工业   72篇
原子能技术   12篇
自动化技术   211篇
  2024年   3篇
  2023年   9篇
  2022年   22篇
  2021年   26篇
  2020年   23篇
  2019年   24篇
  2018年   25篇
  2017年   25篇
  2016年   25篇
  2015年   19篇
  2014年   35篇
  2013年   69篇
  2012年   70篇
  2011年   55篇
  2010年   53篇
  2009年   61篇
  2008年   40篇
  2007年   34篇
  2006年   34篇
  2005年   23篇
  2004年   28篇
  2003年   23篇
  2002年   18篇
  2001年   13篇
  2000年   5篇
  1999年   12篇
  1998年   17篇
  1997年   13篇
  1996年   15篇
  1995年   9篇
  1994年   5篇
  1993年   9篇
  1992年   5篇
  1991年   2篇
  1990年   5篇
  1989年   4篇
  1988年   4篇
  1987年   3篇
  1986年   4篇
  1985年   4篇
  1984年   6篇
  1983年   4篇
  1982年   2篇
  1979年   5篇
  1978年   3篇
  1977年   3篇
  1976年   2篇
  1974年   2篇
  1973年   1篇
  1972年   1篇
排序方式: 共有904条查询结果,搜索用时 31 毫秒
1.
2.
Debittered trub (brewing waste) is an important source of protein source (70.26%). Trub and whey protein were used for 5% protein enrichment of ice cream frozen by liquid nitrogen. Three formulations were elaborated: ice cream standard (ICS), ice cream with whey protein (ICW) and ice cream with trub (ICT). Chemical composition, rheological properties, texture, overrun, melting rate, scanning electron microscopy and a sensorial test were performed. Results showed that ICT presented a higher viscosity, obtained on the upward curve up to 6.76 Pa s−1, consistency index (22.96 (Pa s−1)n), hysteresis area (140.40 mPa s−1) and hardness (31113.33 g) but a lower melting rate (0.38 g min−1), overrun (13.92%) and sensorial acceptability than the other formulations. The addition of trub debittered for protein enrichment improved ice cream properties and demonstrated that it could be used as a food ingredient.  相似文献   
3.
Minds and Machines - To address the rising concern that algorithmic decision-making may reinforce discriminatory biases, researchers have proposed many notions of fairness and corresponding...  相似文献   
4.
5.
Journal of Low Temperature Physics - We have investigated disorder phenomena in solid 4He near megting in presence of vacancies by means of Quantum Monte Carlo (MC) simulations using the Shadow...  相似文献   
6.
Mixtures of Cr and Mo elemental powders, with the nominal compositions Cr25Mo75, Cr50Mo50, and Cr75Mo25, are processed by high-energy ball milling at ambient temperature. Milling is observed to force the mixing of the immiscible bcc elements Cr and Mo into solid solutions. The lattice parameter of these solid solutions, measured by X-ray diffraction (XRD), displays the expected positive deviation from Vegard’s law. These deviations are compared to the ones predicted by Eshelby’s inclusion model for dilute alloys. The conventional Williamson-Hall approach is shown to fail to determine the grain size in as-milled samples, probably due to the high density of dislocations. Annealing at 700 °C for 10 hours under argon leads to a large reduction in structural defect density, without inducing any significant decomposition. The mixing measured in Cr-Mo is discussed in the broader context of the mechanical mixing forced by ball milling in moderately immiscible systems.  相似文献   
7.
8.
In this paper, we consider the classical equations of the positive real lemma under the sole assumption that the state matrix A has unmixed spectrum: σ(A)∩σ(−A)=. Without any other system-theoretic assumption (observability, reachability, stability, etc.), we derive a necessary and sufficient condition for the solvability of the positive real lemma equations.  相似文献   
9.
10.
Summary We introduce a very simple model for thermally activated atomic migration on a lattice, and several techniques to handle it. For thermodynamical systems, the model can be used for simulating decomposition paths taking into account relevant metallurgical features. Close to equilibrium, the simplest mean-field approximation of the model can be linearized with respect to the departure from equilibrium; one then gets a microscopic interpretation of classical phenomenological coefficients, such as mobility, interfacial transfer coefficient, rate constants for the coupled relaxation of concentration and order fields. Further away from the equilibrium, the nonlinearities can be taken into account in a consistent way. For driven alloys, i.e. alloys submitted to external forcing, forced atomic migration is added to the model and new features emerge: the model is supported by several experimental results some of which confirmed its predictions a posteriori.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号