全文获取类型
收费全文 | 2914篇 |
免费 | 120篇 |
国内免费 | 36篇 |
专业分类
电工技术 | 91篇 |
综合类 | 335篇 |
化学工业 | 76篇 |
金属工艺 | 16篇 |
机械仪表 | 68篇 |
建筑科学 | 1755篇 |
矿业工程 | 62篇 |
能源动力 | 128篇 |
轻工业 | 44篇 |
水利工程 | 150篇 |
石油天然气 | 35篇 |
武器工业 | 3篇 |
无线电 | 53篇 |
一般工业技术 | 92篇 |
冶金工业 | 70篇 |
原子能技术 | 7篇 |
自动化技术 | 85篇 |
出版年
2024年 | 5篇 |
2023年 | 10篇 |
2022年 | 25篇 |
2021年 | 30篇 |
2020年 | 30篇 |
2019年 | 26篇 |
2018年 | 28篇 |
2017年 | 41篇 |
2016年 | 45篇 |
2015年 | 63篇 |
2014年 | 206篇 |
2013年 | 111篇 |
2012年 | 180篇 |
2011年 | 208篇 |
2010年 | 225篇 |
2009年 | 205篇 |
2008年 | 246篇 |
2007年 | 279篇 |
2006年 | 233篇 |
2005年 | 169篇 |
2004年 | 138篇 |
2003年 | 132篇 |
2002年 | 98篇 |
2001年 | 77篇 |
2000年 | 62篇 |
1999年 | 53篇 |
1998年 | 40篇 |
1997年 | 25篇 |
1996年 | 12篇 |
1995年 | 13篇 |
1994年 | 12篇 |
1993年 | 15篇 |
1992年 | 8篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有3070条查询结果,搜索用时 250 毫秒
91.
针对城市转型重构过程中小产权房的优势及发展现状作了简要阐述,就小产权房产生的原因从三方面入手加以分析,并结合目前现状提出了解决对策,从而满足人们的住房需求。 相似文献
92.
薛洁如 《南通纺织职业技术学院学报》2012,12(4):57-59
结合南通市儿童福利院的扩建项目,对儿童福利院建筑的设计理念、规划布局、环境营造、造型、色彩及细部设计等进行了探析。分析了儿童福利院作为公共福利建筑中的一种特殊类型,其规划与设计必须注意的问题,以及设计中需体现福利文化,充分满足孤、残、障儿童生活、学习、教育、医疗护理、康复训练和心理疏导等特定的要求,提出坚持以人为本的原则,实现建筑与文化、环境的有机融合。 相似文献
93.
A Two‐Stage Stochastic Mixed‐Integer Programming Approach to the Smart House Scheduling Problem
下载免费PDF全文
![点击此处可从《Electrical Engineering in Japan》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A “smart house” is a highly energy‐optimized house equipped with photovoltaic (PV) systems, electric battery systems, fuel cell (FC) cogeneration systems, electric vehicles (EVs), and so on. Smart houses are attracting much attention recently because of their enhanced ability to save energy by making full use of renewable energy and by achieving power grid stability despite an increased power draw for installed PV systems. Yet running a smart house's power system, with its multiple power sources and power storages, is no simple task. In this paper, we consider the problem of power scheduling for a smart house with a PV system, an FC cogeneration system, and an EV. We formulate the problem as a mixed‐integer programming problem, and then extend it to a stochastic programming problem involving recourse costs to cope with uncertain electricity demand, heat demand, and PV power generation. Using our method, we seek to achieve the optimal power schedule running at the minimum expected operation cost. We present some results of numerical experiments with data on real‐life demands and PV power generation to show the effectiveness of our method. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 186(4): 48–58, 2014; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.22336 相似文献
94.
Craig F. Morris E. Patrick Fuerst Derek J. McLean Kathleen Momont Caleb P. James 《Journal of food science》2014,79(11):S2323-S2329
Wheat (Triticum aestivum L.) plays a central role in the health and nutrition of humans. Yet, little is known about possible flavor differences among different varieties. We have developed a model system using the house mouse (Mus musculus L.) to determine feeding preferences as a prelude to extending results to human sensory analysis. Here, we examine the application of a single‐elimination tournament design to the analysis of consumption preferences of a set of hard red and hard white spring wheat varieties. A single‐elimination tournament design in this case pairs 2 wheat varieties and only 1 of the 2 is advanced to further tests. Preferred varieties were advanced until an overall “winner” was identified; conversely, less desirable varieties were advanced such that an overall “loser” was identified. Hollis and IDO702 were the winner and loser, respectively, for the hard red varieties, and Clear White 515 and WA8123 were the winner and loser, respectively, for the hard white varieties. When using the more powerful protocol of 14 mice and a 4?d trial, differences in mean daily consumption preferences of 2 varieties were separated at P‐values as small as 2 × 10?8. The single‐elimination tournament design is an efficient means of identifying the most and least desirable varieties among a larger set of samples. One application for identifying the 2 extremes in preference within a group of varieties would be to use them as parents of a population to identify quantitative trait loci for preference. 相似文献
95.
砖混结构房屋施工中容易发生的问题及解决对策 总被引:2,自引:0,他引:2
砖混结构是指小部分钢筋混凝土及大部分砖墙承重的结构。在砖混结构中加入构造柱和圈梁,能提高结构的抗震能力,但由于一些施工管理人员对构造柱的作用原理认识不清,施工中出现很多质量问题,使有些部位的构造柱和圈梁不但达不到抗震目的,反而影响了结构安全性。 相似文献
96.
城市规模不断扩大,为了解决城市内部供水问题,在设计小区和建筑物时,会设立一个集中供水的水泵房。本文分析了水泵房设备的安装技术,为水泵房的安装、水泵隔振降噪工作、水泵设备试运行提出了相应的技术措施,以提高水泵房的安装质量。 相似文献
97.
In 2010, the Australian residential construction sector contributed about 28% of the value of all construction and was responsible for 8% of the total energy consumption. Residential construction will continue to increase to cope with the demand due to population growth. Owing to land scarcity, construction on sloping sites has become a common construction method for residential development in Australia. This method has economic benefits but poses environmental issues as it damages topsoil, disturbs natural drainage and groundwater pathways and imposes additional stress on soil under fill. The life cycle energy consumption of the construction process is examined in relation to residential projects on sloping sites on a range of slopes and soil types in New South Wales, Australia. Forty-one detached dwellings were selected and a service life of 60 years assumed for the study. The research findings reveal that the slope for each type of soil has a positive correlation with life cycle energy consumption. As part of the onsite construction process, the results also show that the energy consumption of construction on sloping sites plays a significant factor in the life cycle energy analysis of a building. 相似文献
98.
99.
100.
房建工程的质量与广大人民群众的利益息息相关,而且还决定着项目投资是否能成功。只有加强房建工程项目施工质量的管理,才能保证房建工程的安全与可靠。论文主要分析了房建工程项目施工存在的问题以及如何加强房建工程项目施工质量的管理。 相似文献