全文获取类型
收费全文 | 171篇 |
免费 | 6篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 6篇 |
综合类 | 23篇 |
化学工业 | 25篇 |
金属工艺 | 1篇 |
机械仪表 | 4篇 |
建筑科学 | 22篇 |
矿业工程 | 3篇 |
能源动力 | 11篇 |
轻工业 | 7篇 |
水利工程 | 4篇 |
石油天然气 | 6篇 |
无线电 | 4篇 |
一般工业技术 | 21篇 |
冶金工业 | 12篇 |
自动化技术 | 32篇 |
出版年
2023年 | 2篇 |
2021年 | 3篇 |
2020年 | 7篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 10篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 6篇 |
2012年 | 9篇 |
2011年 | 12篇 |
2010年 | 9篇 |
2009年 | 6篇 |
2008年 | 11篇 |
2007年 | 10篇 |
2006年 | 12篇 |
2005年 | 12篇 |
2004年 | 6篇 |
2003年 | 13篇 |
2002年 | 7篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 4篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有181条查询结果,搜索用时 0 毫秒
11.
This paper investigates the forces correlated with environmental innovations (EIs) introduced by firms in local production systems (LPS). The role of inter-firm network relationships, agglomeration economies and internationalization strategies is jointly analysed for a sample of 555 firms in the Emilia–Romagna (ER) region (North-East Italy). Cooperating with a certain kind of local actors—i.e. suppliers and universities—is the most important EI driver for the investigated firms, along with their training coverage and their adoption of information and communication technologies. The role of agglomeration economies is instead less clear-cut. They spur EIs only in the presence of established LPS, with idiosyncratic sector specialization, while conversely they act as EI barriers. Networking effects and agglomeration economies are instead found to strongly promote the adoption of EIs by multinational firms, thus highlighting the importance of local–global interactions. Interesting specifications for these results are found for particular kinds of EIs, in such fields as CO2 abatement and ISO labelling, generally extending the analysis of EI drivers by joining local and international factors. In addition, the role of regulatory sector factors confirms the induced innovation hypothesis and provides a robustness check to our results. 相似文献
12.
This study identified innovations that could potentially reduce the risk of MSDs in the construction sector. The action research approach was based on a collaborative model of researchers working with workplace representatives. We searched for innovations being used by construction companies. From a potential database of 125 innovations, the study focused on 20 innovations that varied in their penetration into worksites in the geographical area, represented a variety of trades, and were a cross-section of tools and work organizational processes. It examined the attributes of the innovations, and the barriers to their adoption. The analysis was based on observations of workers, surveys of workers and construction-safety consultants, and company interviews. The study found that innovations were adopted by companies for multiple advantages including productivity and quality, but not necessarily ability to reduce MSD risks, their non-complexity, and cost. The major barriers for adoption were the traditional culture of the construction sector rather than financial ones. 相似文献
13.
富勒烯、碳纳米管和石墨烯等低维纳米碳材料为近年来纳米材料和纳米技术领域的研究热点。本文以3种典型的低维纳米碳材料为研究对象,通过对德温特(Derwent)专利数据库收录的从2005—2015年专利受理数量、国家分布、专利权人名称、学科类别及国际专利分类代码等相关信息进行分析,发现近年来研发人员更加关注石墨烯,对碳纳米管和富勒烯的关注度在逐渐下降。经过对全球低维纳米碳材料技术创新现状与发展趋势的分析,指出我国低维纳米碳材料在进一步发展中还存着研发领域发展不均衡、缺乏全方位发展战略的整体布局研究、技术成果不能顺利转化、经费投入偏低等问题,并针对以上问题提出了建设性意见,以期为我国低维纳米碳材料相关领域的技术创新和决策提供参考。 相似文献
14.
综合型院校城市规划专业设计类课程教学改革的若干思路 总被引:1,自引:1,他引:0
综合型院校的城市规划专业教育多以地学为背景,教学体系与人才培养特色明显。近年来,为满足社会实践需要,适应专业教育评估要求,综合型院校积极进行了城市规划专业课程教学体系的调整与改革。通过对设计类课程教学的考察,发现目前多数综合型院校的总体状况仍不理想,与工科院校相比仍存在较大差距。在深入分析造成以上状况原因的基础上,提出了综合型院校设计类课程教学改革的有效思路,以期改进教学效果,提升学生设计实践能力。 相似文献
15.
通过对一种大型专用压力机的设计过程介绍,阐明一种结构新颖、控制简单合理的创新设计思路。既很好地满足了实际使用要求,又大大降低了设备成本,且操作简单、维护方便。 相似文献
16.
中国经济蓬勃发展,建筑市场活跃,但在强大的外来文化冲击下,加上求新求异的环境氛围,中国建筑师尚未发挥先锋性和实验性的积极作用.在分析存在问题及原因的基础上,提出2010年上海世博会是中国建筑走向世界的契机,在培育让中国建筑师施展能力的土壤和环境之外,中国建筑师更应努力选取,自主创新. 相似文献
17.
In a 2001 report titled Energy Research at DOE: Was It Worth It? a National Research Council (NRC) committee defined a set of simplifying rules to estimate the net economic benefits from technologies supported by the Department of Energy (DOE). We evaluate the efficacy of the NRC rules compared to published literature on acceleration of technology introduction into markets, technology diffusion, and infrastructure change. We also offer considerations for revisions of the rules that call for the use of technology and sector-specific data, advanced forecasting techniques, and sensitivity analysis to test the robustness of the methodology. 相似文献
18.
基于手机电视业务的特点,结合创新扩散理论,对技术接受模型予以扩展和细化。分析了影响消费者使用手机电视意愿的关键因素,如:感知有用性、感知易用性、感知趣味性等。以此为基础,在市场宣传、定价、节目内容等方面,对手机电视的发展和推广提出策略性建议。 相似文献
19.
Abstract. The innovations algorithm can be used to obtain parameter estimates for periodically stationary time series models. In this paper, we compute the asymptotic distribution for these estimates in the case, where the innovations have a finite fourth moment. These asymptotic results are useful to determine which model parameters are significant. In the process, we also develop asymptotics for the Yule–Walker estimates. 相似文献
20.
从机床与过程的相互作用出发,阐述了机床产品创新的概念,指出刀具材料是机床发展的推动者,新需求是机床创新的拉动者.继而从以人为中心的观点探讨了机床与人和环境的关系.最后描述了机床产品不连续创新的特征和案例,机床产品创新不是孤立的事件,其形成机制和过程呈现出与生物进化类似的路径依赖特征. 相似文献