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   2075篇
  免费   91篇
  国内免费   19篇
电工技术   5篇
综合类   141篇
化学工业   90篇
金属工艺   13篇
机械仪表   43篇
建筑科学   1276篇
矿业工程   26篇
能源动力   28篇
轻工业   265篇
水利工程   4篇
石油天然气   15篇
武器工业   1篇
无线电   34篇
一般工业技术   62篇
冶金工业   8篇
原子能技术   6篇
自动化技术   168篇
  2024年   11篇
  2023年   30篇
  2022年   36篇
  2021年   28篇
  2020年   42篇
  2019年   29篇
  2018年   51篇
  2017年   31篇
  2016年   84篇
  2015年   67篇
  2014年   169篇
  2013年   115篇
  2012年   147篇
  2011年   148篇
  2010年   128篇
  2009年   127篇
  2008年   121篇
  2007年   113篇
  2006年   118篇
  2005年   76篇
  2004年   75篇
  2003年   58篇
  2002年   43篇
  2001年   32篇
  2000年   40篇
  1999年   18篇
  1998年   28篇
  1997年   12篇
  1996年   14篇
  1995年   5篇
  1994年   4篇
  1993年   6篇
  1992年   1篇
  1991年   5篇
  1990年   21篇
  1989年   20篇
  1988年   38篇
  1987年   24篇
  1986年   19篇
  1985年   31篇
  1984年   17篇
  1983年   3篇
排序方式: 共有2185条查询结果,搜索用时 15 毫秒
61.
This article presents the first phase of a research project whose purpose is to introduce a new form of collaboration and communication between the school and the family through an Electronic Booklet (EB). The EB was developed due to the increasing necessity of collaboration between the school and the family, promoting the teaching-learning process and educational success, supported by information and communication technologies. These conclusions and justifications were derived from a survey based in a questionnaire applied to guardians and teachers of several private and public Portuguese schools of the primary and secondary education level. Both groups – guardians and teachers stressed the importance of communication between school and family and expressed interest in the EB as a communication tool. The analysis of the survey results made possible the construction of an Electronics Booklet prototype.  相似文献   
62.
中国传统城市长期受儒教文化的浸润,充溢了中国传统文化的外形和内涵,在现代城市建设中,人们只顾现代化建设而废祖忘典,如广州的南海神庙就把神圣的空间环境破坏了 中国的各地民居创造了传统家庭阖家团聚的礼仪空间格局和营造了温馨的家庭氛围.扬州古城里有许多老民居重建古典私家小园和重建老宅,用自己的行动在找回乡愁.  相似文献   
63.
郑红 《南方建筑》2014,(1):62-70
民间建筑彩画呈现出不同的地域文化特征,广东潮州民居传统木构彩画,艳丽的色彩、满铺的构图看似繁俗,仔细归类分析其用色、图案、题字、题词、题材、位置及方位,便可发现这些彩画与它所处建筑之空间和用途存在着密切的关系,也可揭示潮州民系的历史发展根源、地区生产技术、传统宗族信念、社群经济文化和营造工艺传承,是表现潮州人生活愿景和礼制观念的重要载体。学界对于中国建筑地域彩画暂时未有规范的研究方法,本文基于田园调查,在古潮州府城、海阳、澄海、揭阳、普宁、饶平、潮阳和惠来等偏远乡镇地进行了普查,记录许多未入文物登记的民宅的室内梁架彩画,将幸存的清代民宅彩画残迹对比潮州民系的发展,疏理其彩画历史演化沿革。案例以潮州民宅的基本建筑形态:下山虎、四点金、三座落、驷马拖车和寨城五类建筑的彩画进行分析比较,希望可以补充我国民间木构彩画的学术空白、保存地域文化传统、加强海内外潮系人民的身份认同,借助保护民居珍贵遗产探讨可持续发展地域文化的方向。  相似文献   
64.
杨生潇 《山西建筑》2014,(26):20-21
结合晋中地区的文化背景,以晋中传统民居为研究对象,对民居的结构形式、建筑材料、特点进行了分析研究,并对当今传统民居的改造策略进行了探讨,给出了几点建议,对现代人居环境设计具有重要意义。  相似文献   
65.
This study examined the factors that influence households' decisions on adoption of biogas technology in northern Ethiopia. It involved 179 biogas-user and 179 non-user sample households. They were selected using proportionate simple random and purposive sampling techniques, respectively. Data were collected mainly using semi-structured questionnaires. Data analyses employed logistic regression model. The results of the study showed that male-headed households are more likely to adopt the technology than female-headed ones. Educational level, heads of cattle, income level, access to credit, distance to the main fuelwood source, and number of planted trees have significant (p < 0.01) positive influences on adoption of biogas technology. Significant (p < 0.01) spatial variations are also obtained between the two study sites. Furthermore, the interaction effects of a few pairs of explanatory variables were found significant (p < 0.1). Empowering females and female-headed households, improving educational levels of the household heads, increasing cattle size, raising income levels, improving access to credit, and encouraging households to plant more trees are likely to be some of the way forward to increase the adoption of the technology. Considering the spatial variations, ensuring the creation of satisfied biogas-users, upgrading the existing biogas model through addition of ‘injera’ stove can also enhance adoption of biogas technology.  相似文献   
66.
This paper presents the results of a recent research effort to collect and analyze data pertaining to traditional bath buildings (“hammams”) in Egypt, Turkey, Morocco, Syria, and Algeria. Thereby, the energy performance of and the thermal comfort conditions in five such buildings were studied. Moreover, empirically calibrated building performance simulation models of a number of objects were generated in order to predict the consequences of alternative thermal retrofit measures. The results provide the opportunity for an objective assessment of the actual energy and indoor environmental performance of these buildings.  相似文献   
67.
Salep is produced from tubers of orchids that grow naturally in various regions of Turkey. It constitutes the raw material of a traditional Turkish beverage and is used for giving hardness and elasticity to Kahramanmaras-type of ice cream. Salep also is used as a raw material for some drugs. Botanists have reported that continuous and uncontrolled harvesting causes some orchid species to decrease to a critical level. For this reason, exportation of salep was prohibited by the Turkish Ministry of Agriculture and Rural Affairs.  相似文献   
68.
Little detailed evidence has previously been available regarding the uptake rate or prevalence of energy efficiency interventions among specific household groups. This study uses the Home Energy Efficiency Database (HEED) to investigate both the combination of measures that have been installed, and in which dwellings, according to key neighbourhood socio-demographic variables, including income and tenure. Analysis of 2000–07 data indicates that approximately 40% (9.3 million) dwellings in England had approximately 23.7 million efficiency measures installed, with an average of 2.5 measures per dwelling. Building fabric-related measures were the most frequent (e.g. cavity wall insulation, loft insulation and glazing) with an average of 2.1 million installed each year. Dwellings with the highest number of fabric interventions (the top 20%) were more likely to be found in areas with low income, with more owner-occupied dwellings, experiencing lower winter temperatures, having a lower proportion of flats, and having a slightly higher proportion of older adults and children. Energy efficiency installations have tended to occur among specific types of households or parts of the building stock. These findings have implications for the design of future government programmes for targeting energy efficiency measures to specific household groups or dwelling types.  相似文献   
69.
根据工业和信息化部《关于开展移动通信转售业务试点工作的通告》,电信业下一步的工作重点是发展电信转售业务,运营商可以利用虚拟运营商营销手段多样化的优势,将话音、流量套餐进行批发,再经虚拟运营商与自营商品及服务进行捆绑销售,从而有效拓展传统运营商市场销售渠道。针对电信运营商与虚拟运营商的合作模式、业务发展模式进行比较,提出优化合作建议,并给出可行的组网方案。  相似文献   
70.
于琍 《城市建筑》2013,(22):230-230
现代居住建筑能源和材料的消耗日益增多,环境压力日益增大,当代生态居住建筑研究兴起。人们开始重新审视中国传统民居建筑蕴含的生态建筑理念和技术经验,用以指导现代居住建筑的设计。  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