全文获取类型
收费全文 | 40篇 |
免费 | 7篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 1篇 |
综合类 | 1篇 |
化学工业 | 4篇 |
金属工艺 | 2篇 |
机械仪表 | 1篇 |
建筑科学 | 10篇 |
轻工业 | 13篇 |
无线电 | 2篇 |
一般工业技术 | 5篇 |
自动化技术 | 11篇 |
出版年
2021年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2014年 | 1篇 |
2013年 | 8篇 |
2012年 | 1篇 |
2011年 | 5篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2006年 | 6篇 |
2005年 | 1篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1997年 | 4篇 |
1995年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1966年 | 2篇 |
排序方式: 共有50条查询结果,搜索用时 15 毫秒
1.
利用两种等通道角挤压(ECAP)方法(普通单步ECAP和两步ECAP)制备细晶ZK60合金。采用金相显微镜、扫描电镜、透射电镜和X射线衍射仪对合金的组织和织构进行观察,通过拉伸试验研究不同ECAP方法对合金力学性能的影响。结果表明:与单步ECAP变形相比,两步ECAP变形,由于降低了变形温度,晶粒细化效果更好;经过(240℃,4道次)+(180℃,4道次)两步ECAP变形后,合金晶粒细化至约0.8μm;合金的力学性能与材料的织构密切相关,由于存在织构软化效应,与挤压态相比,经单步ECAP变形后合金的强度有所降低,而伸长率明显提高;但经两步ECAP变形后,由于细晶强化和亚结构强化的作用,合金的强度得到提高。 相似文献
2.
Abstract This paper outlines a new approach to the synthesis of information from data. Information is defined as a detected organization of data after a process of discretization (or partitioning) and event covering. The discretization is based on a hierarchical maximum entropy scheme which iteratively minimizes the loss of information according to Shannon. The event-covering process is based on an evaluation of the deviation of the observed frequencies of an event from the expectation due to prior knowledge (defined by the null hypothesis and/or domain knowledge). The hierarchical maximum entropy discretization scheme provides a rigorous and efficient way in solving the non-uniform scaling problem in multivariate data analysis. Because our method refines the boundaries dynamically depending on the detection of information, it directs the analysis on the outcome subspace with high information content. In addition, it naturally produces a hierarchical view of information so that data can be analyzed/synthesized with respect to an outcome context. The method has been tested using simulated and real life data with very good result. 相似文献
3.
In this study, short fiber-reinforced cement-based building products of sheets, pipes and honeycomb panels incorporating various mineral admixtures such as slag, silica fume, and metakaolin have been developed by the extrusion technique. The experimental works have shown that these products do have very good mechanical properties. Since the key point for a successful extrusion is the properly designed rheology which controls both internal and external flow properties of ext rudate, a nonlinear viscoelastic model was applied to investigate the rheology behavior of a movable fresh cementitious composite in a single screw extruder channel. The theoretical analysis is used to guide the practical manufacturing. 相似文献
4.
Abstracts are not published in this journal 相似文献
5.
7.
To enhance productivity in a distributed manufacturing system under hierarchical control, we develop a framework of dynamic scheduling scheme that explores routeing flexibility and handles uncertainties. We propose a learning-based methodology to extract scheduling knowledge for dispatching parts to machines. The proposed methodology includes three modules: discrete-event simulation, instance generation, and incremental induction. First, a sophisticated simulation module is developed to implement a dynamic scheduling scheme, to generate training examples, and to evaluate the methodology. Second, the search for training examples (good schedules) is successfully fulfilled by the genetic algorithm. Finally, we propose a tolerance-based learning algorithm that does not only acquire general scheduling rules from the training examples, but also adapts to any newly observed examples and thus facilitates knowledge modification. The experimental results show that the dynamic scheduling scheme significantly outperforms the static scheduling scheme with a single dispatching rule in a distributed manufacturing system. 相似文献
8.
9.
Internet has developed in a rapid way in the recent 10 years,and the information of web site has also been increasing fast. Predicting web user’s behavior becomes a crucial issue following the purposes like increasing the user’s browsing speed efficiently, decreasing the user’s latency as well as possible and reducing the loading of web server. In this paper, we propose an efficient prediction model, two-level prediction model (TLPM), using a novel aspect of natural hierarchical property from web log data. TLPM can decrease the size of candidate set of web pages and increase the speed of predicting with adequate accuracy. The experiment results prove that TLPM can highly enhance the performance of prediction when the number of web pages is increasing. 相似文献
10.
自20世纪90年代始,欧洲大陆的葡萄种植进入了结构调整期。卡蒙纳,一个西班牙的家庭式酒酿造企业,在这个倾向下迁离市中心的陈旧结构,修建了一座新的建筑体。在2001年第一期工程期间,建筑师达到了能量消耗减低和工作空间最优化的指标。在2008年的第二期工程规划期间,景观设计师苏阿茜·丹尔娞(SoazigDarnay)对游人接待的逻辑和整座酒窟建筑及其生产活动与周边环境之融为一体进行了思考。项目建立在酒窟、田野和临近的山川和谐的概念上。 相似文献