如何协调生物防治和化学防治之间的关系

病虫害的防治手段是多样化的,任何手段只要能有效地防治和控制病虫害的发生和危害都是可取的。各种手段和方法之间的关系应该是互补的而不是排他的。生物防治和化学防治是两种最重要的病虫害防治手段。二者各有利弊,我们应协调他们之间的关系,将二者有机地结合起来。     

Chemical kinetic modeling for the effects of methyl ester moiety in biodiesel on PAHs and NO x formation

In order to investigate the effects of methyl ester moiety on polycyclic aromatic hydrocarbons (PAHs) and NO x formation in biodiesel combustion, the combined models were developed based on detailed methyl butanoate (MB) oxidation model and n-butane model. Also, PAHs detailed reaction mechanism and NO x formation mechanism were added to the detailed models to form the combined models. The combined models were used to compare the combustion of n-butane and MB in a shock tube simulation to understand the effects of methyl ester moiety. The results indicated that compared with n-butane, the methyl ester moiety in MB leads to different reaction pathways, more CO and CO 2 formation and less formation of PAHs precursors such as ethylene and acetylene. In addition, a better chemical insight into the effects of methyl ester moiety on NO x formation was given, which will help to understand the combustion process of biodiesel.     

Crystal growth of calcite at conditions of gas processing in solvent mixtures of monoethylene glycol and water

Growth kinetics of the most stable polymorph of calcium carbonate,calcite,has been studied in seeded stirred batch experiments in MEG-water solutions at 40 ℃ and 70 ℃,conditions relevant for the processing of natural gas.It was found that MEG changes the growth order from two in pure water to one in solvent mixtures of MEG and water.Assuming parabolic growth (growth order is equal to two),it could be shown that MEG decreases the growth rate constant for calcite from 0.52 nm/s to 0.11 nm/s (70 ℃) when the MEG-content is increased from 0 wt% MEG to 65 wt% MEG.Decreasing the temperature from 70 ℃ to 40 ℃ has a similar effect on the growth rate constant as raising the level of MEG to 65 wt%.     

利用Dialog为化工企业提供信息服务

本文从化工企业的实际需要出发，简述了如何从Dialog国际联机系统检索到他们所需要的信息。     

基于工作过程的“化工机械设备技术”课程改革与实践

化工机械设备技术是一门理论与实践结合紧密,综合性和实践性很强的专业课程,按照基于工作过程的项目化教学方式组织实施教学,有利于实现教学目标。文章从课程体系、教学内容、教学手段、考核方法等方面对该课程的改革进行了探索,并提出了解决办法。     

化学实验室危险、剧毒、易制毒化学品的管理异同

通过对高等学校化学实验室危险化学品、剧毒化学品、易制毒化学品的采购、运输、库房保管、领取、使用等方面的管理异同进行比较,保证剧毒化学品和易制毒化学品的合法使用,消除安全隐患,提高高等学校化学实验室危险化学品、剧毒化学品、易制毒化学品的安全管理水平.     

白茅根化学成分、药理作用及在保健品开发中的应用

白茅根用于防病保健已达2千年的历史,近年来在保健品开发中有广泛的应用。对其化学成分及药理研究也取得了一定进展,但2010版《中国药典》对白茅根尚无明确的质量控制方法。其主要化学成分和生物活性的关系,尚须进行系统研究,以期建立白茅根完整的质量控制体系。     

“慕课堂”在线上线下混合式教学中的应用——以“食品理化检测技术”为例

线上线下混合式教学是基于互联网技术和在线开放课程,在网络学习的基础上,结合线上教学和线下课堂教学一种教学模式。线上在线开放课程学习和线下课堂教学各有优缺点,通过“慕课堂”将线上学习和线下课堂教学相融合,充分发挥线上在线开放课程资源的优势,辅助线下课堂教学。“食品理化检测技术”课程线上线下混合式教学,应用“慕课堂”串联学生和教师的活动,串联集中学习和自主学习,充分发挥在线开放课程的作用,保障授课质量,有效提升学生学习效果。     

菥蓂的化学成分及药理作用研究进展

综述了国内外对菥蓂的化学成分和药理作用的研究现状,旨在为菥蓂的进一步开发利用提供参考.     

基于能力培养的化工原理实验教学方法的改革实践

对化工原理传统实验教学方法进行改革,通过转变学生“身份”,有效提高了学生的理论水平和动手能力。