Hierarchical planning for a surface mounting machine placement

For a surface mounting machine(SMM)in printed circuit board(PCB)assembly line,there are four problems,e.g. CAD data conversion,nozzle selection,feeder assignment and placement sequence determination. A hierarchical planning for them to maximize the throughput rate of an SMM is presented here. To minimize set-up time,a CAD data conversion system was first applied that could automatically generate the data for machine placement from CAD design data files. Then an effective nozzle selection approach was implemented to minimize the time of nozzle changing. And then,to minimize picking time,an algorithm for feeder assignment was used to make picking multiple components simultaneously as much as possible. Finally,in order to shorten pick-and-place time,a heuristic algorithm was used to determine optimal component placement sequence according to the decided feeder positions. Experiments were conducted on a four head SMM.The experimental results were used to analyse the assembly line performance.     

语文阅读素养的提升策略探讨

语文阅读素养的提升要注重课内外相结合,课内学习阅读方法,课外阅读丰富积累。教师要为学生由课内向课外的过渡搭好"桥梁",要让学生"走出去"还能"回得来",培养学生良好的阅读习惯,使学生掌握方法,丰富积累,逐步提高学生运用语言文字的能力。文章对语文阅读素养的提升策略进行论述。     

辞赋源流谈

原始巫祭仪式活动造就了辞赋产生的客观环境，巫祭咒语成为辞赋的萌芽。辞赋的许多特点都来源于巫祭活动的仪式和咒语，这不仅直接影响了辞赋的源，也影响了辞赋的流。辞赋的发展透露出文化的力量和社会时代变迁的力量。     

Purification and relationship with gastric disease of a 130 kDa (CagA) protein of<Emphasis Type="Italic">Helicobacter pylori</Emphasis>

Objective: The aims of this research were to purify and identify the 130 kDa (CagA) protein ofH. pylori clinical isolate HP97002 and evaluate the relationships between the purified 130 kDa (CagA) protein and gastric diseases. Methods: The procedure for isolating the protein included 6 mol/L guanidine extract, size exclusion chromatography and elusion from gel. Sera of 68 patients with gastric diseases (44 with chronic gastritis, 15 with atrophic gastritis, 7 with peptic ulcer disease, 2 with gastric cancer) were obtained, and the serological response to CagA was studied by Western-blot using the purified protein. Results: The purified protein was 130 kDa and preserved good antigenicity and revealed basic isoelectric point about of 8.1. Among 68 sera, 43 sera could recognize the purified protein associated with chronic gastritis 47.7% (21/44), atrophic gastritis 86.7% (13/15), peptic ulcer disease 100% (7/7), gastric cancer 100% (2/2). Compared with each other, the difference was significant (χ²=13.327,P=0.004), and 130 kDa (CagA) protein was associated with severe gastric diseases (r _s=0.442,P=0.001). Conclusion: The 130 kDa (CagA) protein was associated with severe gastric diseases. Project supported by the China Medical Board (96-628) and Zhejiang Province Hygiene Bureau (2000 A055)     

从生命走向美——封孝伦著《人类生命系统中的美学》述评

封孝伦著《人类生命系统中的美学》一书,从人的生命出发,从人的生命需要的角度去解释审美现象,对美学的研究作出了一系列突破性的创断。本文从认识上的创新,理论上的创新,价值观的创新三方面对封著在美学研究中的贡献进行了评述。     

《圣经》典故翻译对中英文学的影响

《圣经》是基督教的经典著作，也是杰出的文学作品，大量出典于《圣经》的文学典故，与世界各国文化相互融合，《圣经》的典故翻译就对英语语言文学和中国文学产生了极其深远的影响。     

基于语义web技术的定制产品配置知识建模

为成功实施大规模定制战略,研究解决了在语义层次建模产品配置知识的问题.结合语义web技术,提出了基于本体的配置知识建模方法.开发了通用配置本体为建模特定产品领域的配置知识和规则提供公共的概念结构,采用OWLweb本体语言和语义web规则语言(SWRL)形式化地表示了配置本体、领域配置知识和规则,以促进各种配置知识的一致性、可维护性和重用性.可定制的个人计算机族的配置知识建模说明了该方法能为特定的产品配置领域提供明确的、计算机可理解的知识语义,高效率地支持自动的复杂产品配置任务.     

高中生物模块学业评价方案

1总体评价方案 基于《普通高中生物课程标准（实验）》（以下简称《课程标准》）的要求，推行素质教育，引导学生注重“基础知识与特长同时发展”是教育教学改革的大方向。高中生物学在《课程标准》的背景下，以发展性评价的理念为导向，既要进行学生学业成绩的认定，又要重视评价功能的发展。学生学业评价是根据课程目标和具体教学进行，既要科学、客观、公正、合理，     

社区卫生服务中心慢性病防治模式的探讨

为了探索慢性病防治模式,通过向居民及慢性病患者提供以健康教育、慢性病筛查和慢性病系统管理为主要内容的社区卫生服务,观察慢性病防治状况,结果显示:明显改变了居民不良生活方式,提高了慢性病控制率,同时降低了医疗费用的支出。因此,认为开展社区卫生服务,建立慢性病防治模式,是改变现有慢性病防治工作滞后的有效途径。     

数形结合,解答"带电粒子在磁场中运动"问题

近年来高考对数学能力的要求,突出了几何图形直观形象地表达研究对象的动态情景特征规律,体现了物理学科特征和数学工具功能,使能力检测方式更加合理有效.这种情况在处理"带电粒子在磁场中运动"问题时体现尤为突出,下面就此问题作一简要总结.