全新在线滴定技术的研究与应用

A new on-line titration method and device based on a new technique-continuous flow titration is described.By the means of electronically controlled switching of a solenoid valve,the main component of the system,the equivalent point of the titration is easily determined.Several kinds of mixing tools were examined.whereby a self-made mixing chamer with minimum volume gave best results and was therefore used in the dveice,The error of the titration is within 0.2% and the relative standard deviation(RSD) is below 1.2%,The results show no difference compared with a commercial device,meanwhile the new on-line titration system is cheaper and fully automated and thus easy to hand and less slovent consumption.     

Do rice water weevils and rice stem borers compete when sharing a host plant?

The rice water weevil (RWW) Lissorhoptrus oryzophilus Knsehel (Coleoptera: Curculionidae) is an invasive insect pest office Oryza sativa L. in China. Little is known about the interactions of this weevil with indigenous herbivores. In the present study, adult feeding and population density of the weevil, injury level of striped stem borer Chilo suppressalis (Walker) (Lepi-doptera: Pyralidae) and pink stem borer Sesamia inferens (Walker) (Lepidoptera: Noctuidae) to rice, as well as growth status of their host plants were surveyed in a rice field located in Southeastern Zhejiang, China, in 2004 with the objective to discover interspecific interactions on the rice. At tillering stage, both adult feeding of the weevil and injury of the stem borers tended to occur on larger tillers (bearing 5 leaves) compared with small tillers (bearing 24 leaves), but the insects showed no evident competition with each other. At booting stage, the stem borers caused more withering/dead hearts and the weevil reached a higher density on the plants which had more productive tillers and larger root system; the number of weevils per tiller correlated nega-tively with the percentage of withering/dead hearts of plants in a hill. These observations indicate that interspecific interactions exist between the rice water weevil and the rice stem borers with negative relations occurring at booting or earlier developmental stages of rice.     

关于幂等矩阵乘积的迹的不等式

研究一些未必对称的矩阵乘积的迹的不等式，给出了关于幂等矩阵Bellman不等式成立的条件．     

建设和谐社会与职业教育发展

建设社会主义和谐社会是社会各个子系统、各项事业发展的共同目标。“和谐”是职业教育的应有之义,和谐职业教育的基本特征包括:公平公正、以人为本、协调发展、均衡合理。职业教育的和谐发展对于建设和谐社会的突出贡献表现为,促进社会人才结构均衡、社会合理流动、社会公平正义和社会持续发展。政府、职业学校和社会都应该为促进职业教育的和谐发展承担相应的责任。     

教师反学校文化现象浅析

教师反学校文化是一种教师亚文化形态。本文基于社会学的整体论，初步辨析了构成教师反学校文化的若干要素，即教师反学校文化的性质、结构、功能、表现方式等，并进一步从若干视角出发，分析了教师反学校文化的表现类型，初步揭示了若干当前我国教师反学校文化的重要成因。     

对大专院校非音乐类专业开展音乐教育思考

提高音乐素养对学生全面发展有着重要意义，音乐具有解除学生思想压力的功能，是精神文明建设的手段，大专院校非音乐专业开展音乐教育不仅具有社会意义，也有现实的意义，结合现实状况论述了开展音乐教育的意义。     

网上录取与深化高考改革

高考制度自 1 977年恢复以来 ,经过不断的改革和发展 ,日臻完善 ,尤其是在科目设置、考试内容、录取办法、计算机管理等方面 ,都经历了较大的变化。网上录取是教育部确定的深化高考改革的 4项内容之一 ,是建立在计算机信息处理技术和网络技术基础上的一种全新的录取管理模式 ,是高校招生手段的革命性变革 ,既有利于维护公平、公正 ,又可以节省人力、财力 ,并将带动高校招生考试其他方面的改革     

"双诱式"数学解题教学模式探析

“双诱式”数学解题教学模式,克服了传统的填鸭式教学,变教为诱,变学为思,以诱达思,促使学生主动探究、解决问题,从而使分析、解决问题能力得到提高。     

新世纪电大“生存和发展”空间浅析

社会需求和对受教育对象开放是广播电视大学赖以生存和发展的基础。21世纪，这个基础随着现代化建设的进程以及城镇化战略的实施逐步加强，电大获得了前所未有的发展机遇。电大应在人才质量、考风考纪建设、壮大办学实力、构建终身教育体系等方面作出努力，才能抓住机遇，求得更大的发展。