全文获取类型
收费全文 | 474篇 |
免费 | 62篇 |
国内免费 | 41篇 |
学科分类
工业技术 | 577篇 |
出版年
2024年 | 10篇 |
2023年 | 37篇 |
2022年 | 37篇 |
2021年 | 22篇 |
2020年 | 24篇 |
2019年 | 28篇 |
2018年 | 19篇 |
2017年 | 12篇 |
2016年 | 20篇 |
2015年 | 20篇 |
2014年 | 37篇 |
2013年 | 23篇 |
2012年 | 22篇 |
2011年 | 39篇 |
2010年 | 27篇 |
2009年 | 26篇 |
2008年 | 19篇 |
2007年 | 26篇 |
2006年 | 14篇 |
2005年 | 20篇 |
2004年 | 20篇 |
2003年 | 14篇 |
2002年 | 8篇 |
2001年 | 4篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 9篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有577条查询结果,搜索用时 125 毫秒
2.
3.
Replacement of precious single metal catalysts with cost-effective, highly-dispersed composite catalysts for catalytic hydrothermal conversion of residue holds tremendous promise for the residue upgrading technologies. Organic metals were added to the feed as the oil-soluble precursors, and transformed into the catalytic active phases in this work. Physical properties and structures of the composite catalysts had been investigated by X-ray fluorescence spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscope and transmission electron microscopy. The composite catalysts were found to be highly efficient in the catalytic hydrothermal conversion of both model compound and residue. Increased metal dispersion and synergistic effects of two metals played indispensable roles in such catalytic system. Results showed that under the test conditions in the article, the catalyst had the best catalytic performance when the mass ratio of molybdenum to iron was 1.5. 相似文献
4.
分析了韩国、日本及国内运营商手机游戏业务的发展状况.探讨了手机游戏业务的模式.论述了该业务的战略定位和市场前景。从地区提供给移动通信市场对外部环境、产业链的准备是否充分以及运营商内部的资源和运营状况等三个方面阐明了手机游戏业务发展的关键因素。 相似文献
6.
企业管理者一直以来都是利用各种各样的信息来帮助实现他们企业经营的目标。因此.信息管理对于企业经营者来说并不是新课题.但如何获得最准确的信息和如何更有效地使用信息却是企业管理者面临的难题。计算机的出现使这一切成为可能。现代管理科学和计算机技术、信息技术相结合是企业管理发展的方向.特别是在工程项目管理中,涉及到业主、设计方、承包商、施工方、材料供应商、监理等各方,他们之间存在着信息不对称且代表利益不同的特点,所以构建一个信息平台,保证沟通交流的顺畅进而发展到对项目进行管理.是建筑企业当务之急。 相似文献
7.
本文研究环境温度与桥差保护电容器组不平衡电流的关系,首先分析温度对并联电容器的影响,通过试验得到不同电容器的温度系数,进而得到电容器温度系数的普遍规律,在此基础上,对桥差不平衡电容器组进行考虑温度因素的仿真分析,最后参考换流站实际运行情况,分析直流工程中桥差保护电容器组的不平衡电流与温度的关系。为直流工程中电容器组调平提供了参考。 相似文献
8.
The oxidation of carbon nanotubes, C60 and graphite was studied by thermogravimetric (TG) analysis and differential thermal analysis (DTA) technique, and the oxidation kinetic models of three carbon materials studied were analyzed by mechanism-function method. The results indicate that three carbon species adopt different oxidation mechanisms due to their different structures. The oxidation of carbon nanotubes with cylindrical structure follows contracting volume reaction mechanism [R3 mechanism, 1-(1-α)1/3 = kt], indicating that the oxidation of carbon nanotubes takes place from the ends to the center. For graphite with planar sandwich structure, the oxidation starts at the edges initially and gradually moves toward the center, which corresponds to contracting area phase boundary reaction mechanism [R2 mechanism, 1-(1-α)1/2 = kt]. The oxidation of C60 with spherical structure, however, is complex and apparently cannot be illustrated with a single kinetic model. The values of apparent activation energy 相似文献
9.
10.
A sink moving scheme based on local residual energy of nodes in wireless sensor networks 总被引:1,自引:1,他引:0
In the application of periodic data-gathering in sensor networks, sensor nodes located near the sink have to forward the data
received from all other nodes to the sink, which depletes their energy very quickly. A moving scheme for the sink based on
local residual energy was proposed. In the scheme, the sink periodically moves to a new location with the highest stay-value
defined by the average residual energy and the number of neighbors. The scheme can balance energy consumption and prevent
nodes around sink from draining their energy very quickly in the networks. The simulation results show that the scheme can
prolong the network lifetime by 26%–65% compared with the earlier schemes where the sink is static or moves randomly.
Foundation item: Project(60673164) supported by the National Natural Science Foundation of China; Project(20060533057) supported by the Specialized
Research Foundation for the Doctoral Program of Higher Education of China 相似文献