汽车轻量化技术:铝/镁合金及其成型技术发展动态

为了推动我国汽车工业轻量化进程,文章从新材料、成型新技术、新应用三个方面对铝合金、镁合金两类轻金属材料的国内外研究动态进行了回顾,分析了两类轻金属材料在汽车工业应用的阻力,提出了我国汽车工业铝/镁合金可能的发展建议。     

Empirical approach to develop a multilayer icebonded abrasive polishing tool for ultrafine finishing of Ti-6Al-4V alloy

This paper covers the development of a multilayer icebonded abrasive polishing (IBAP) tool for multistage polishing of Ti-6Al-4V alloy specimens based on a systematic study that determined the number of layers, thickness of each layer, and the type, size and concentration of abrasives in each layer. Based on this study, a three-layered IBAP tool with the bottom layer consisting of soft aluminum oxide abrasives of 3?µm size with 5% concentration, the middle layer with moderately hard silicon carbide abrasives of 8?µm size with 10% concentration and the top layer with hard boron carbide abrasives of 15?µm size with 30% concentration was formulated for ultrafine finishing of Ti-6Al-4V alloy specimen in a single setup. The performance of the three-layered IBAP tool assessed in terms of finish and morphology over the work surface showed 81% improvement in surface finish, showing its effectiveness over a single-layered IBAP tool. Polishing studies have clearly demonstrated the generation of ultrafine surfaces, yielding a finish of 37?nm while the morphological studies on the polished surface have shown a nearly scratch-free surface on the Ti-6Al-4V alloy.     

预制菜包装技术的发展概况及趋势

目的 综述预制菜包装材料和技术的应用,为进一步开发预制菜包装提供研究基础。方法 根据国内外预制菜包装的研究进展,介绍预制菜包装主要的材料和技术,及可用于预制菜包装的新型包装技术。结果 目前使用的预制菜包装技术有真空包装和气调包装等,需要加快对预制菜包装技术的研究和新型包装材料的应用,促进预制菜产业的发展和升级。结论 随着预制菜的迅速发展,预制菜的包装受到消费者的更多关注,新型的食品包装技术在预制菜领域具有广阔的发展空间。     

冶金物理化学教学方法的探讨与实践

就诱导、发展学生兴趣,注重能力培养,引入反馈——强化矫正措施等教学法进行了浅析,并探讨了其在冶金物理化学课教学中的应用。     

原油价格与油田经济开发期

介绍了油田经济开发期的概念,给出了原油价格与经济开发期之间的定量关系,在不同的原油价格下计算了某油田经济开发期,说明原油价格直接影响油田的经济开发期。     

微机生产管理系统在锡钢二炼分厂的应用

用WPS软件编制适用于生产管理的优化组合表,是程序开发的依据,可以编制程序,并满足生产管理的要求。     

Development of categorical representations for above and below spatial relations in 3- to 7-month-old infants.

A series of experiments examined the abilities of infants to form categorical representations for the spatial relations above and below. Exp 1 provided evidence that 3–4 mo olds can form categorical representations for above and below when a diamond shape was presented above or below a horizontal bar. Exps 2 and 3 showed that 3- and 4-mo olds did not form categorical representations for above and below when a number of discriminably different shapes (e.g., a diamond, a triangle, a dot) appeared above or below the bar. These more abstract categorical representations for above and below were formed by 6- to 7-mo olds (Exp 4). The findings suggest an experientially or maturationally based trend, from concrete to abstract, in the categorical representation of common spatial relations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

高职院校网络安全防护技术课程的内容开发探索

通过对网络管理类岗位人才需要规格的分析,从而正确定位网络安全防护技术课程的在课程体系中的位置.按照"安全防护策略化、教学模式任务化"的设计理念开发课程,依据网络安全工程师的工作过程和学生的认知规律序化教学内容.开发过程体现了将安全防护技术策略化,科学设计<网络安全防护技术>课程内容的特色.     

数据挖掘研究现状及发展趋势

从数据挖掘的定义出发,介绍了数据挖掘的神经网络法、决策树法、遗传算法、粗糙集法、模糊集法和关联规则法等概念及其各自的优缺点;详细总结了国内外数据挖掘的研究现状及研究热点,指出了数据挖掘的发展趋势。     

在项目实践中培养学生的软件开发能力

鉴于软件开发项目实践可以充分锻炼学生的实际动手能力,提高软件开发水平,培养学生的专业能力。本文遵循软件开发理论,运用理论、模型与技术对实际问题进行分析、设计、开发,强调掌握具体开发流程、重视实际开发环境、学会协作与交流是软件工程专业学生最基本的专业能力与素质。探讨在一系列软件开发项目的实施过程中注重项目导向性、制定科学评价体系的重要性。