二氧化氯防治棉花枯萎病探讨

为探讨ClO2用于防治棉花枯萎病的效果,通过和市场上常用的杀菌剂多菌灵、甲基托布津进行田间对比试验,结果表明：采用添加1％～2％棉花专用添加剂的80ppm ClO2溶液,用灌根和喷雾相结合的办法,其平均死亡率可低达2．7％,而多菌灵、甲基托布津平均死亡率分别为19．3％和16．2％．可以看出,添加1％～2％的添加剂ClO2溶液防治效果明显优于多菌灵和甲基托布津．     

稳定性二氧化氯的应用开发

论述了稳定性二氧化氯的优良特性、生产工艺及应用开发     

二氧化氯的理化性质及其应用

近年来 ,二氧化氯作为饮用水消毒剂日益受到人们的重视 ,因为随着人们对传统的氯气消毒的深入研究 ,发现用氯气和其它氯系消毒剂处理过的饮用水及食品中含有氯化副产物———三氯甲烷 ,这是一种很强的致癌物质。使用二氧化氯处理的水中则不会产生三氯甲烷 ,其安全性被世界卫生组织列为Al级 ,二氧化氯已成为国际上公认的氯系消毒剂最理想的更新换代产品 ,被欧美国家推崇为第四代消毒剂。二氧化氯不仅是一种广谱、高效的消毒剂 ,而且还是优良的水处理剂、食品保鲜剂、漂白剂、防腐剂和除臭剂 ,于是迅速在水处理行业、食品行业、造纸行业、日…     

开放性数学教育实验研究

开放性数学教育以传统数学教育的封闭性为切入口和突破口,坚持开放教育的理念,贯彻全面开放的目标,以学习者为中心,给予学生学习的主动权。经过四年的实验研究,通过主导开放,主体开放,信息开放,方式方法、时空环境开放等措施,取得了一定的成绩。     

一元固体二氧化氯的制备及其特性研究

采取微囊化技术,对自制高活性固体二氧化氯母料进行了一元化处理,发现包膜剂浓度和用量对固体二氧化氯母料的稳定性有很大的影响.包膜剂浓度在20%~30%之间为宜,包膜剂用量越多,产品的稳定性越好,但过多的包膜剂会阻碍母体成分的溶解.     

A theoretical framework for studying educational media: A pilot study

Are different media equally effective for a given learning task when each presents the same event of instruction? Are given instructional materials equally effective for different types of learning outcomes? This pilot study used three types of stimulus materials—text, film, and live demonstration—to teach cardiopulmonary resuscitation to graduate students. Learning outcomes measured were verbal learning and a motor skill task.     

学生主体网络作文讲评教学模式的实验研究

作文讲评是中学作文教学的重要环节。依据现代建构主义学习理论、现代教育技术 理论,以及信息论、控制论的思想建立的主体网络作文讲评教学模式,在实验中取得了较好 的效果,提高了学生的作文水平。     

通过归因训练提高学生学习自信心的实验研究

学生学习的积极性很大程度上取决于学生完成学习任务的自信心。有强烈的自信心,可以“移山填海”;缺乏自信心,不可“反掌折枝”。通过对学生进行归因训练的实验研究,向教育者提供一条培养学生自信心的途径。     

用NaOH溶液吸收氯气配制氯水

通过实验探索找到了用NaOH溶液吸收氯气配制氯水的方法.     

沼气研究性学习过程实录

1　为选定课题作准备根据选题 ,让学生查阅文献资料 ,上网检索 ,综合信息 ,如下 :(1)沼气的存在、成份及燃烧热 ;(2 )沼气形成的发酵过程及正常生产沼气的条件 ;(3)沼气是一种生物能 ,利用科学发酵的方法生产沼气 ,是解决目前我国广大农村能源的最现实有效的途径之一 ;(4)我国使用沼气的历史和现状 ;(5 )海底的甲烷水合物。2　外出实践 ,去小河里收集沼气我校附近的斗门河 ,流经奉化城区 ,生活污水和原奉化啤酒厂的工业污水排入此河 ,十分适宜学生收集沼气 ,我校高二 (7) (8)两班学生实地收集 ,发现此河沼气十分丰富。[收集方法 ](1)收集沼…     

不同环境下二氧化氯消毒剂的消毒效果及其稳定性研究

为了研究不同环境下二氧化氯的消毒效果及其稳定性,试验以大肠杆菌、金黄色葡萄球菌、枯草芽孢杆菌、白色念珠菌为测试菌株,采用菌悬液定量杀菌试验、压缩雾化法和平板计数的方法,对二氧化氯的杀菌效果进行试验。结果表明：在菌液密度为5×10^6 CFU/mL的条件下,90 mg/L的二氧化氯作用5 min,即可对测试菌株达到100%的杀灭效果。不同的pH值、温度及不同浓度有机物存在的条件下,二氧化氯同样具有极强的消毒效果。雾化的二氧化氯对空气自然菌及雾化菌液气溶胶的杀灭效果同样可以达到100%。试验表明二氧化氯作为一种高效、稳定的广谱消毒剂具有良好的杀菌效果。     

Dyslexia and learning musical notation: A pilot study

Both the alphabet and our system of musical notation are largely based on arbitrary conventions and associations. Conforming to the Dyslexic Automatization Deficit Hypothesis, children suffering from dyslexia are supposed to have difficulty in automating these types of conventions and/or associations. Scientific research into the relation between dyslexia and learning musical notation is rare. Therefore, we developed a new intervention paradigm on learning musical notation. This program was followed by five dyslexic children and four children without dyslexia, in order to study and compare the learning processes of both groups. The program consisted of instruction, practice in the skills and knowledge related to musical notation, and test assignments. During each session, the problem-solving process of the individual child was observed and the amount of time required to complete each assignment in the program was recorded. In addition we analyzed the errors made by the two groups of children in each session. A pretest-posttest comparison revealed that dyslexic children needed more time to learn musical notation than did children without dyslexia. Dyslexic children also made more mistakes and produced more ‘third transpositions’. The implications for teaching musical notation are outlined.     

电镀酸洗液资源化的中试研究

利用电镀酸洗液氧化制备聚合氯化铁溶液的方法为:工业废酸确定含量后,配置成反应液,进入反应体系;氧气催化氧化,检测二价铁合格后,进入浓缩体系,减压浓缩;比重合格后,调节酸度,保温聚合.     

用微型化学实验来探究氯气的性质

氯气的性质是高中化学中极其重要和有意义的部分,由于氯气的毒性众所周知,所以在讲授氯气性质的教学过程中通常以教师的演示实验为主。     

A pilot study for a structured, time-limited therapy group for sexually abused pre-adolescent children

The critical role of specific types of mastery skill development in the treatment of sexually abused children is explored, and defense mechanisms of "invulnerable children," who function adequately despite trauma and stress, are described. The authors describe their development of structured group therapy techniques designed to foster these types of mastery skills with sexually abused children aged 6 to 8. These techniques include development of intellectualization defenses through original coloring books and therapeutic board games, cathartic exploration of feelings through structured art and storytelling exercises, cognitive relabeling and self-esteem building through role-play, "chants and cheers," homework shared with mothers, and other structured group procedures designed to develop specific coping skills.     

Kinetics study on biomass pyrolysis for fuel gas production

Kinetic knowledge is of great importance in achieving good control of the pyrolysis and gasification process and optimising system design. An overall kinetic pyrolysis scheme is therefore addressed here. The kinetic modelling incorporates the following basic steps: the degradation of the virgin biomass materials into primary products (tar, gas and semi-char), the decomposition of primary tar into secondary products and the continuous interaction between primary gas and char. The last step is disregarded completely by models in the literature. Analysis and comparison of predicted results from different kinetic schemes and experimental data on our fixed bed pyrolyser yielded very positive evidence to support our kinetic scheme. Project (No. 2001CB409600) Supported by the National Key Basic Research Program (973) of China     

Kinetics study on biomass pyrolysis for fuel gas production

INTRODUCTIONSincebiomassisanabundant,inexpensiveandrenewableresource ,itsconversiontosyn theticfuelsandchemicalproductsappearsat tractive.Amongallkindsofbiomassconversionroutes,pyrolysisisbeinggivenincreasingatten tionsincetheprocessissimpleandmaybeopti m…     

氯取代基对经典Diels-Alder反应影响的密度泛函研究

使用密度泛函理论研究了氯取代基对经典Diels-Alder反应势能曲线的影响.结果表明:在氯取代基存在时,乙烯与1,3-丁二烯的Diels-Alder反应中各个稳定点的关键键长一定程度上变短;反应中氯取代基降低了乙烯的LUMO能量,反应能垒有所降低,反应过程中各个稳定点的相对吉普斯自由能降低;顺式-1,3-丁二烯更容易反应,该反应的协同机理能量上比双自由基分步机理更加有利.