全文获取类型
收费全文 | 583篇 |
免费 | 16篇 |
国内免费 | 13篇 |
专业分类
电工技术 | 9篇 |
综合类 | 81篇 |
化学工业 | 70篇 |
金属工艺 | 16篇 |
机械仪表 | 52篇 |
建筑科学 | 95篇 |
矿业工程 | 6篇 |
能源动力 | 12篇 |
轻工业 | 30篇 |
水利工程 | 4篇 |
石油天然气 | 7篇 |
武器工业 | 1篇 |
无线电 | 28篇 |
一般工业技术 | 25篇 |
冶金工业 | 60篇 |
原子能技术 | 22篇 |
自动化技术 | 94篇 |
出版年
2024年 | 2篇 |
2023年 | 4篇 |
2022年 | 11篇 |
2021年 | 26篇 |
2020年 | 20篇 |
2019年 | 5篇 |
2018年 | 7篇 |
2017年 | 9篇 |
2016年 | 10篇 |
2015年 | 13篇 |
2014年 | 40篇 |
2013年 | 25篇 |
2012年 | 41篇 |
2011年 | 59篇 |
2010年 | 35篇 |
2009年 | 32篇 |
2008年 | 37篇 |
2007年 | 39篇 |
2006年 | 22篇 |
2005年 | 30篇 |
2004年 | 23篇 |
2003年 | 25篇 |
2002年 | 15篇 |
2001年 | 11篇 |
2000年 | 10篇 |
1999年 | 5篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1994年 | 2篇 |
1982年 | 2篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1971年 | 2篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1965年 | 3篇 |
1964年 | 8篇 |
1963年 | 1篇 |
1961年 | 5篇 |
1960年 | 1篇 |
1958年 | 2篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1955年 | 2篇 |
1954年 | 3篇 |
排序方式: 共有612条查询结果,搜索用时 15 毫秒
91.
92.
归纳整理了潮汕传统建筑装饰题材的发展沿革、取材类型、取材特点,并结合儒学思想、民俗美学、社会美学等方面的理论,初步分析了当地传统建筑装饰题材所承载的民俗文化和美学取向. 相似文献
93.
Despite a perception to the contrary, the performances and values of innovative firms can differ. While people are preconditioned to believe that these firms perform well and have high valuations, this is not always the case. In order to explain this phenomenon, we adopt a lens of strategic orientations that influence innovation: market orientation and technology orientation. By using 10-year panel data, and a content analysis examining the relative orientations of our sample firms, we find that the market-oriented and technology-oriented tendencies of innovative firms influence firm performance and value. Relatively market-oriented innovative firms can guarantee instant performance by offering customers new products and services that they want. However, customers may not be loyal to one particular innovative firm. By contrast, relatively technology-oriented innovative firms are not subject to customers' fastidious choices and have higher firm values. Furthermore, environmental uncertainty negatively influences the relatively market-oriented innovative firms' value as well as sales performance. 相似文献
94.
95.
Kazumi Ikeda Richard A. Kochendarfer Shigeru Kunishima 《Nuclear Engineering and Design》2011,241(5):1438-1453
This paper presents about conceptual designs of Advanced Recycling Reactor (ARR) focusing on enhancement in transuranics (TRU) burning and americium (Am) transmutation. The design has been conducted in the context of the Global Nuclear Energy Partnership (GNEP) seeking to close nuclear fuel cycle in ways that reduce proliferation risks, reduce the nuclear waste in the US and further improve global energy security. This study strives to enhance the TRU burning and the Am transmutation, assuming the development of related technologies in this study, while the ARR based on mature technologies was designed in the previous study. It has followed that the provided TRU burning core is designed to burn TRU at 28 kg/TWthh, by adding moderator pins of B4C (Enriched B-11) and the Am transmutation core will be able to transmute Am at 34 kg/TWthh, by locating Am blanket of AmN around the TRU burning core. It indicates that these concepts improve TRU burning by 40-50% than the previous core and can transmute Am effectively, keeping the void reactivity acceptable. 相似文献
96.
广播电视编导专业是高等教育中发展较为迅速的专业,如何健康有序的培养合格人才,也是专业学科建设中所面临的突出问题。结合专业特点、人才培养目标、培养模式等,文章从三个方面对该专业进行了分析、探讨,提出对目前高校广播电视编导专业方向建设认识与建议。 相似文献
97.
首先介绍电信运营商的业务转型及IT所面临的挑战,分析互联网企业的成功经验及支撑其核心业务的革新式IT基础架构,进而探讨互联网企业的革新式IT基础架构在电信运营商数据中心应用的有效性,最后阐述互联网企业典型的两个解决方案(模块化数据中心和定制化服务器)对于运营商发展互联网业务的有效性。 相似文献
98.
María‐Jesús Oliveras‐López Marzia Innocenti Francisco Martín Bermudo Herminia López‐García de la Serrana Nadia Mulinacci 《European Journal of Lipid Science and Technology》2012,114(9):999-1006
In this approach we studied the glycaemia levels in 20 healthy young volunteers (26 ± 2 years), before and after a 30‐day intake of 50 mL of extra virgin olive oil (EVOO). We selected an oil rich in phenolic compounds (523 mg/L) with a high content of secoiridoidic derivatives (over 94.5%). The findings from our study reveal a significant decrease of glycaemia from 89.6 ± 6.8 to 82.7 ± 10.3 mg/dL (p<0.05), related to a long term daily intake of the study EVOO, as the only added fat. A significant increment of the HDL cholesterol, from 68.7 ± 11.5 to 75.2 ± 4.9 mg/dL, was also highlighted. Total cholesterol, LDL, VLDL, triglycerides, and blood pressure did not show significant variation after the 30‐day consumption of this EVOO. So far, few articles have described the influence of EVOO consumption, on plasma glucose levels in humans. This effect is observed in a group of healthy young humans. Moreover, we confirm that the level of free hydroxytyrosol (OH‐Tyr) in plasma increased up to fourfold (p<0.05) after the 30‐day intake of this EVOO. In addition, the excretion in urine of the main metabolite of OH‐Tyr, homovanillic acid (HVA), significantly increased. 相似文献
99.
谢亢 《计算机光盘软件与应用》2011,(13)
当前中小学校园网的应用在取得成绩的同时存在些问题。对中小学校园网创新应用可以作几方面的探索。以下就是笔者对问题和探索观点的看法。 相似文献
100.