首页 | 官方网站   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   112674篇
  免费   9916篇
  国内免费   3831篇
工业技术   126421篇
  2025年   444篇
  2024年   2484篇
  2023年   2344篇
  2022年   3766篇
  2021年   4790篇
  2020年   3969篇
  2019年   3226篇
  2018年   3120篇
  2017年   3605篇
  2016年   3240篇
  2015年   4596篇
  2014年   5813篇
  2013年   6623篇
  2012年   7698篇
  2011年   8433篇
  2010年   7561篇
  2009年   7124篇
  2008年   7109篇
  2007年   6629篇
  2006年   6324篇
  2005年   5025篇
  2004年   3571篇
  2003年   3024篇
  2002年   3067篇
  2001年   2568篇
  2000年   2150篇
  1999年   1860篇
  1998年   1351篇
  1997年   1034篇
  1996年   917篇
  1995年   688篇
  1994年   557篇
  1993年   387篇
  1992年   330篇
  1991年   248篇
  1990年   165篇
  1989年   147篇
  1988年   91篇
  1987年   81篇
  1986年   61篇
  1985年   31篇
  1984年   19篇
  1983年   26篇
  1982年   24篇
  1981年   28篇
  1980年   32篇
  1979年   9篇
  1959年   8篇
  1953年   3篇
  1951年   6篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
1.
This article deals with the kinetics of two-step anionic polymerization by way of a non-steady state method. Several molecular parameters can be evaluated using the formulae developed. A bimodal molecular weight distribution function for the resulting polymer is derived from the set of kinetic differential equations, which is in agreement with the experimental data reported.  相似文献   
2.
A new integrated magnetic full wave DC/DC power converter that provides flexible transformer design by incorporating an independent output inductor winding is introduced. The transformer is implemented on a traditional three-leg magnetic core. The inductor winding can be separately designed to control the output current ripple. The cross-sectional area of the inductor core leg can be reduced dramatically. The operation and performance of the proposed circuit are verified on a 100 W prototype converter.  相似文献   
3.
We demonstrate the first programmable group-delay module based on polarization switching. With a unique binary tuning mechanism, the device can generate any differential group delay value from -45 to +45 ps with a resolution of 1.40 ps, or any true-time-delay value from 0 to 45 ps with a resolution of 0.7 ps. The delay varying speeds for both applications are under 1 ms and can be as fast as 0.1 ms. We evaluate both the dynamic and static performances of the device while paying special attention to its dynamic figures of merit for polarization-mode dispersion emulation and compensation applications. Our experiment shows that the device exhibits a negligible transient-effect induced power penalty (<0.2 dB) in a 10-Gb/s nonreturn-to-zero system.  相似文献   
4.
The authors report the implementation of deep-submicrometer Si MOSFETs that at room temperature have a unity-current-gain cutoff frequency (fT) of 89 GHz, for a drain-to-source bias of 1.5 V, a gate-to-source bias of 1 V, a gate oxide thickness of 40 Å, and a channel length of 0.15 μm. The fabrication procedure is mostly conventional, except for the e-beam defined gates. The speed performance is achieved through an intrinsic transit time of only 1.8 ps across the active device region  相似文献   
5.
This paper deals with the non-steady-state kinetics of direct thermal initiated polymerization. The initiation is assumed to be a bimolecular reaction of the monomer. The relationship between the radical concentration and the monomer conversion is rigorously derived. In further treatment a few very close approximations are introduced based on the fact that the number of monomer molecules reacting in the initiation step is much less than that consumed in the propagation step for a process producing high polymer, and the value of the rate constant for propagation or chain transfer is much lower than that for chain termination. Expressions for various molecular parameters, such as molecular weight distribution, number-average and weight-average degrees of polymerization, and dispersity, are given. Several numerical examples are provided.  相似文献   
6.
BaTiO3 multilayer capacitors with a nominal capacitance of 3.5nF have been carefully measured using the thermally stimulated current (TSC) technique. When a 300V polarization voltage is applied at room temperature, a new TSC peak appeared in defective sample A after it has been immersed in water. No new peak was found in good-quality sample B after a similar treatment. The accelerated life test shows that sample A hasa much shorter life than sample B in terms of insulation resistance.  相似文献   
7.
Current solid and surface modeling methods based on Euclidean geometry in traditional computer aided design are not efficient in constructing a large number of atoms and particles. In this paper, we propose a periodic surface model for computer aided nano design such that geometry of atoms and molecules can be constructed parametrically. At the molecular scale, periodicity of the model allows thousands of particles to be built efficiently. At the meso scale, inherent porosity of the model represents natural morphology of polymer and macromolecule. Surface and volume operations are defined to support crystal and molecular model creation with loci and foci periodic surfaces. The ultimate goal is to enable computer assisted material and system design at atomic, molecular, and meso scales.  相似文献   
8.
本文简要地介绍了美国一家公司提供的原皮防腐方法。  相似文献   
9.
压缩感知理论提供了一种新的数据获取和压缩思路,能有效地把计算负担从编码端转移到解码端.高光谱数据具备数据稀疏性、空间相关性和谱间相关性,结合这3类先验知识,提出了一种基于复合正则化的高光谱图像压缩感知投影与重构方法.该方法的编码端只需要一个简单的投影操作;在重构算法实现中,基于变量分裂的思想,把具备多个正则项的优化问题转化成多个简单的优化问题,并用迭代方式求解.实验结果表明,本文算法在高光谱图像重构上能获得更高的峰值信噪比和更好的重构效果.该方法具备极低的编码复杂度,适用于资源受限的机载和星载高光谱成像平台.  相似文献   
10.
随着高校信息化建设的推进,特别是数字化校园的广泛应用,重要数据越来越多地集中存储于学校数据中心。如何保障数据的安全成为亟待解决的问题。数据备份是确保数据安全的重要措施,本文分析了数据备份面临的挑战及应对方法,介绍了数据本地、异地备份的常用方法,设计了一套实用的异地数据灾备体系,并对未来的技术发展进行了展望。  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

京公网安备 11010802026262号