多目标规划问题的交互式保守最优方法

多目标规划问题的交互式保守最优方法岑成德（广州中山大学管理学院，广州５１０２７５）ＴｈｅＩｎｔｅｒａｃｔｉｖｅＣｏｎｓｅｒｖａｔｉｖｅＯｐｔｉｍａｌＭｅｔｈｏｄｆｏｒＭｕｌｔｉｐｌｅＯｂｊｅｃｔｉｖｅＰｒｏｇｒａｍｍｉｎｇＣｅｎＣｈｅｎｇｄｅ（Ｓｃｈ...     

点燃文学激情提高人文素养——初中文言文复习策略探究

文言文博大精深,如何让学生主动地、快乐地投入到文言文复习中,提高复习效率,是语文教师长期探索的一大难题.实践证明,采用课本剧编演和擂台赛的形式复习能点燃学生学习文言文的激情,运用比较迁移拓展方法复习,激活学生的知识积累,引导学生根据中考考点梳理文言文知识,会更进一步提升学生水平,真正达到学以致用的目的.     

Near time optimal control with perturbation estimation for flexible spacecraft slewing maneuvers

1.INTRODUCTION Inrecentyears,therehasbeenconsiderableinterest inmodelingandcontrolofflexiblespacecraft.Thisis contributabletotheuseoflightweightandslender materialsforthespeedandfuel efficiencypurposes. Inmanyapplications,sophisticatedcontrolalgo rithmsarerequiredtomakeoptimaluseofmaximum torqueavailablefortimeminimizationmaneuvers, thistimeminimizationcontroloftenresultsinabang bangcontrolthatcanbeimplementedinaerospaceap plicationsusingon offthrusterjetstechnology.But unfortunately,t…     

自学型微机组装实验CAI系统的开发与应用

针对目前高校微机组装实验教学过程中存在的课堂教学效果差,学生缺乏兴趣,容易损坏硬件等问题,提出开发以自主学习理论为设计指导思想的微机组装实验CAI系统。将微机组装实验CAI系统应用于信息技术课教学中,在配合实验教学改革方面效果良好。     

Extraction and Purification of Matrix Protein from the Nacre of Pearl Oyster Pinctada fucata

A soluble matrix protein P14 with an apparent molecular mass of 14.5 kDa was isolated from fragmented nacre of pearl oysters （Pinctada fucata） treated with 10% NaOH solution to investigate the nacre matrix proteins and their effect on the CaCO3 crystal. The protein was characterized by gel exclusion chromatography and reversed-phase high performance liquid chromatography after demineralization by 10% acetic acid. The X-ray diffraction pattern of P14 crystals indicates that P14 plays an important role in nacre biomineralization. P14 can induce aragonite formation, stimulate CaCO3 crystal formation, and accelerate aragonite precipitation. Heating of the acid insoluble nacre residue, which was named conchiolin, in 10% sodium dodecyl sulfate solution supplemented with 10% β-mercaptoethanol solution for 10-20 min at about 100℃ gave two other soluble proteins having molecular masses of 19.4 kDa and 25.0 kDa. The present study suggests that these two proteins are linked to the insoluble organic matrix by disulfide bridges because the extraction yield increases when β-mercaptoethanol is added to the medium.     

人工机械心脏瓣膜体外性能检测

本文阐述人工机械心脏瓣膜体外性能检测的原理和方法,对我国自行研制、生产的四种人工机械心脏瓣膜进行检测和对照,并和美国Bj(o|¨)rk—shiley瓣膜的相应测试曲线进行比较。大量的数据、曲线表明我国目前生产的四种瓣膜的体外模拟通流性能都已达到了美国FDA的规定要求,标志着我国生产的人工机械心脏瓣膜质量已跃进了国际水平,为我国人工机械心脏瓣膜体外性能检测的标准化及检测标准的制定,提供了有价值的数据。文中还对我国生产的四种瓣膜的体外血流动力学特性作出评价。     

PVA固定化葡萄糖氧化酶电极的研制及应用——血清中葡萄糖含量的测定

本文报道了用聚乙烯醇(PVA)固定葡萄糖氧化酶(GOD)并制成酶电极,对膜的导电性能进行试验,在葡萄糖含量为2×10-5-1×10-3M的试验范围内,响应电流的变化与浓度成线性关系。用此电极以安培法测定血清中葡萄糖含量并与邻甲苯胺比色法、GOD-过氧化物酶比色法进行比较,结果较为满意。     

滴汞电极2.5次微分电分析法直接测定钨精矿中锡含量

根据多阶半微分电分析法具有高灵敏度,高分辨率的特点,本文选用氯化四苯砷-硫酸-氯化钠作底液能大大提高锡测定的灵敏度。峰电位Ep为-0.56V(vs SCE),锡含量在1.2×10-9—4×10-8g/ml范围内峰高与浓度成线性关系。对钨精矿中锡含量测定结果满意,回收率为98—102%。同时对极谱波的性质进行了初步探讨。