空气有机物分析用的低浓度标样配制方法研究

通过气相色谱仪,对纯气体、纯液体、混合液体、混合气体的低浓度标样配制方法作了研究。本方法对纯液体、纯气体、混合液体的配制切实可行。     

Cooperative studyware development of organic chemistry module by experts,teachers, and students

Experts, teachers, and students took active part in a process of organic chemistry studyware development. A unique characteristic of this process was the active involvement of three different groups of people in the authoring process: science educators, chemistry teachers, and chemistry students studying towards an education certificate. The science educators—the experts—advised the team on new methods of presenting the subject matter in an appealing way, using 3D computerized molecular modeling. The in-service chemistry teachers contributed from their rich field experience to constructing the studyware. This mutual development helped maintain the balance between expert requirements and expectations from students on one hand, and the actual student capabilities, as perceived by teachers through constant contact with the students, on the other. Finally, the preservice teachers—the undergraduate chemistry students—were often zealous, enthusiastic, and willing to put in the extra time and effort needed to produce quality studyware, while following the guidelines of the experts and teachers. Feedback on the qualities and shortcomings of the studyware was obtained in two cycles. The first one was done while the studyware was still under development by peers, and the second by individual target students, serving as a beta-site. This double feedback helped improve the studyware, mainly by elaborating on portions that require more detail and explanation. The paper describes the process as well as representative parts of the studyware. The combination of experts, teachers, and students in the development team seems to have the potential to yield studyware that is appropriate for effective science education in general and chemistry teaching in particular.     

Thailand's Department of Agricultural Extension and Agrochemical Dependency: Perspectives on Contributing Factors and Mitigation Strategies

Purpose: This paper discusses theoretical, policy and practical issues concerning the problem of ‘agrochemical dependency’ in Thailand, including roles that public extension services play in advocacy or mitigation of agrochemical use.Methodology/Approach: Our research aimed to better understand department of agricultural extension (DOAE) institutional and officials’ perceptions of contributing factors to agrochemical dependency as well as strategies for mitigating agrochemical use. We reviewed relevant policies, web materials and technical cooperation agreements. We supplemented theoretical and document analysis with interviews totalling15 DOAE managers or senior officers comparing Bangkok headquarters and Nan Province perspectives. We refer to relevant secondary literatures for explanatory context.Findings: Results showed differences as well as similarities between views of DOAE officials in Bangkok headquarters and those from one province (Nan) about DOAE priorities, responsibilities and perceived reasons why farmers overuse agrochemicals or do not adopt organic agriculture (OA). A national policy encouraged ‘safe use’ of agrochemicals but not (necessarily or effectively) mitigation while the DOAE still (to a much lesser extent) promoted self-sufficiency and OA alternatives. Interviews and documentary evidence revealed DOAE public–private partnerships with corporate advice, technical support, human resources and learning activities that encouraged or normalized agrochemical use and dependency.Practical Implications: Study results should be useful for governments, donors, international agencies and department officials in policy development, program planning, training design, budgeting and delivery.Originality/Value: This study is unique for: better understanding implications of agrochemical dependency and privatization of public extension services; analyzing factors inhibiting OA adoption; and examining contentious policies, partnerships, and training activities.     

环境科学专业有机化学课程教学改革与实践

有机化学是环境科学专业一门重要的专业基础课,其教学效果直接影响环境科学专业人才培养质量。分析了环境科学专业有机化学课程教学现状与存在问题,分别从教学内容、专业特色、教学方法和课程考核等方面进行改革与探索,旨在提高环境科学专业有机化学课程的教学质量,提升环境科学专业人才培养质量。     

银镜反应反常现象的实验探讨

银镜反应是中学及大学有机化学实验中的一个典型反应,但实验过程中常常会出现一些反常的实验结果。本文经过反复多次的实验,对银镜反应的反常实验现象进行了初步的探讨。     

肉鸡日粮中添加有机铬的试验

选用300只1日龄艾维茵肉鸡,随机分为三组:A组为对照组,喂基础日粮;B和C组为试验组,分别在基础日粮中添加0.2和0.4mg/kg的烟酸铬.结果表明:在日粮中添加烟酸铬可以显著地降低肉鸡的腹脂率(P＜0.05),且有降低皮脂率的趋势(P＞0.05);同时能提高肉鸡在应激环境中的体重(P＜0.05).三组肉鸡的饲料利用率、胸腿肌率、屠宰率及成活率差异均不显著(P＞0.05).     

烯酮及其在有机合成中的应用

烯酮作为一种化学性质非常活泼的有机试剂,其理论与应用研究近年来取得了令人瞩目的进展。本文介绍了烯酮的结构、制备及其在有机合成中的应用。     

氟两相体系在有机合成中的应用

氟两相体系是一种新的相分离和固定化技术,它实现了均相反应多相化,只需经过简单的相分离即可实现反应产物的分离、提纯、和催化剂的再生.本文介绍了氟两相体系的特点并对氟两相体系在烯烃的氢甲酰化、酯化反应以及其它有机反应中的广泛应用进行了综述.     

安徽省土壤磷素形态及其影响因素研究

对安徽省不同性质土壤中的无机磷和有机磷进行了分析 ,结果表明 :土壤磷的含量与形态与成土母质、成土条件和耕作方式有很大关系。土壤无机磷以O P和Ca10 P为主 ,有机磷则以中活性及中稳态有机磷为主     

高校思政教育与大学生创新创业教育的有机融合路径

文章对高校思政教育与创新创业教育融合存在的问题进行了分析,并指出,开展两种教育的重要性,最终提出高校可采取的将思政教育与创新创业教育融合的策略。