抛掷爆破在露天台阶式采矿中应用的探讨

根据利文斯顿的爆破漏斗理论,说明抛掷漏斗及露天矿抛掷爆破法的基本要素是大装药量,使用铵油类炸药和具备松软破裂的软岩地质条件。为取得较高的抛爆率,需要注意选择的技术条件包括台阶高度、炮孔角度、炮孔直径、布孔方式、起爆方式及延时选择等。通常应采用预裂爆破与此法相配合。     

风力发电——电渗析淡化苦咸水示范站的研建与运行

针对海岛风力资源丰富，但用电用水困难的问题，用风力发电－电渗析淡化苦咸水法成功地解决了海岛用电、吃水问题，具有较大的实用意义和社会效益。     

复合材料层板疲劳损伤寿命的预测

根据复合材料层板疲劳损伤机理，首先建立数学模型，然后运用宏观断裂力学的方法分析、推导出了在基体损伤破坏下正交层板的疲劳损伤寿命的预测公式，最后通过算例进行了验证。     

Influence of stresses on martensitic transformation in ferromagnetic shape memory Ni_(50)Mn_(19)Fe_6Ga_(25) ribbons

~~Influence of stresses on martensitic transformation in ferromagnetic shape memory Ni_(50)Mn_(19)Fe_6Ga_(25) ribbons1. Ullakko, K., Huang, J. K., O'Handley, R. C. et al., Large magnetic-field-induced strains in Ni2MnGa single crystals, Appl. Phys. Lett., 1996, 69(13): 1966-1968. 2. James, R. D., Wuttig, M., Magnetostriciton of martensite, Philos. Mag., 1998, A 77: 1273-1275. 3. Wu, G. H., Yu, C. H., Meng, L. Q. et al., Giant magnetic-field-induced strains in H…     

轧钢用直流电动机的使用及维护

分析了直流电动机在使用过程中常见的影响直流电机换向的几个因素.例如:直流电动机在安装时基础不牢固、直流电动机与所带机械对组不同心、换向器表面不清洁、换向器表面有划痕、换向器表面磨损严重、换向器表面产生严重的变形、电机的几何中性线位置发生变化等等,上述原因均将引起直流电动机换向性能变坏,针对每种情况提出了相应的解决方法,同时也提出了如何正确使用和维护直流电动机.     

一种变压器短路试验供电装置网侧电流平衡控制研究

当利用电网进行变压器短路试验时,较大的短路电流会对电网产生冲击,影响同一电网中其他负荷的安全运行.为此,设计了一种三相四线制变压器短路试验供电装置,通过位于直流母线上的储能装置,额外形成一条能量供给通道,以减轻短路电流对电网的冲击.然而利用该供电装置对单相变压器进行短路试验时,若不加以有效控制,系统输出侧的不平衡电流将...     

A survey of tagging techniques for music,speech and environmental sound

Sound tagging has been studied for years. Among all sound types, music, speech, and environmental sound are three hottest research areas. This survey aims to provide an overview about the state-of-the-art development in these areas. We discuss about the meaning of tagging in different sound areas at the beginning of the journey. Some examples of sound tagging applications are introduced in order to illustrate the significance of this research. Typical tagging techniques include manual, automatic, and semi-automatic approaches. After reviewing work in music, speech and environmental sound tagging, we compare them and state the research progress to date. Research gaps are identified for each research area and the common features and discriminations between three areas are discovered as well. Published datasets, tools used by researchers, and evaluation measures frequently applied in the analysis are listed. In the end, we summarise the worldwide distribution of countries dedicated to sound tagging research for years.     

基于响应面分析法的粮食搬运RGV抓手优化设计

取货抓手是粮食搬运RGV完成存取货任务的重要组成部件,由于承载较重,抓手极易发生疲劳和变形.传统的设计方法主要靠实际经验确定抓手的关键尺寸,设计周期长、可靠性低.基于ANSYS软件并采用响应面分析法对抓手进行尺寸优化设计,以抓手的关键尺寸为设计变量,以降低最大等效应力、减小整体变形为优化目标,分析尺寸参数与优化参数之间...     

大米抗性淀粉糊化特性的研究

采用差示扫描量热分析技术(DSC)对大米原淀粉及抗性淀粉样品的糊化温度和吸热焓进行了测试和研究.差示扫描量热分析结果表明,抗性淀粉的开始吸热温度和完成温度均高于原淀粉,且吸热焓增大,说明沸水浴处理使淀粉形成了致密的结晶结构.