《化学研究与应用》征稿简则

本刊属化学类中文核心期刊,是四川省化学化工学会与四川大学合办的涉及化学学科各领域的综合性学术月刊,编辑部设在四川大学化学学院。旨在报道化学学科的理论和应用研究成果,促进学术交流和科技成果转化,为我国社会主义现代化建设服务。读者对象是高校师生、科研院所的科研人员、厂矿企业的技术人员以及有关管理人员和情报工作者。     

《色谱》2015年征订启事

国内统一连续出版物号:CN 21-1185/O6邮发代号:8-43国际标准连续出版物号:ISSN 1000-8713国外发行代号:DK21010CODEN编码:SEPUER《色谱》是中国唯一的色谱专业期刊,主要报道色谱学科的基础性研究成果,色谱及其交叉学科的重要应用科研成果及最新研究进展。适于科研院所及分析测试领域等从事色谱基础和应用技术研究的科研人员、色谱及其相关学科的硕士及博士研究生、色谱器件及仪器的开发人员阅读。     

关于排队模型中任务完成所需时间的讨论

为了更好的模拟和解释人类的活动,针对优先权决定机制模型中任务完成所需时间展开讨论,分别分析了任务完成所需时间满足幂律分布和均匀分布两种情况下任务等待时间的分布规律。数值模拟显示任务等待时间的幂律分布不是来源于任务完成所需时间,而是来源于优先权决定的机制,从而验证了原模型中关于任务完成所需时间假设的合理性。     

Microwave Magnetic Properties and Natural Resonance of e-Co Nanoparticles

Owing to the novel crystal structure, ε-Co nanoparticles with an average diameter of 12 nm are synthesized and the microwave magnetic properties of the epoxy resin composite with 50voi% ε-Co particles are measured in the frequency range 0.1-7 GHz. The experimental resonance frequency （4.7 GHz） matches well with the values obtained by the theoretical calculation with the Kittel equation and fitting the experimental permeability dispersion curve via the Landan-Lifshitz equation. Hence the resonance peak is attributed to natural resonance mode. This work is believed to be beneficial for further understanding microwave applications of the novel ε-Co nanoparticles.     

Excel在高中物理教学中的应用

高中物理有计算、有制表也有绘图,在教学中,恰当地应用Excel能够收到事半功倍的效果.     

Theoretical Study and NBO Analysis of the Decomposition Kinetics of Oxetane, 2-Methyloxetane and 2,2-Dimethyloxetane

A theoretical study of the thermal decomposition kinetics of oxetane (1), 2-methyloxetane (2), and 2,2-dimethyloxetane (3) has been carried out at the B3LYP/6-311+G**, B3PW91/6-311+G**, and MPW1PW91/6-311+G** levels of theory. The MPW1PW91/6-311+G** method was found to give a reasonable good agreement with the experimental kinetics and thermodynamic parameters. The decomposition reaction of compounds 1～3 yields formaldehyde and the corresponding substituted olefin. Based on the optimized ground state geometries using MPW1PW91/6-311+G** method, the natural bond orbital (NBO) analysis of donor-acceptor (bond-antibond) interactions revealed that the stabilization energies associated with the electronic delocalization from σC3-C4 bonding to σ*O1-C2 antibonding orbitals decrease from compounds 1 to 3. The σC3-C4→σO1-C2 resonance energies for compounds 1～3 are 2.63, 2.59 and 2.45 kcal mol-1, respectively. Further, the results showed that the energy gaps between σC3-C4 bonding and σ*O1-C2 antibonding orbitals decrease from compounds 1 to 3. Also, the decomposition process in these compounds are controlled by σ→σ* resonance energies. Moreover, the obtained order of energy barriers could be explained by the number of electron-releasing methyl groups substituted to the Csp3 atom (which is attached to oxygen atom). NBO analysis shows that the occupancies of σCsp3-O bonds decrease for compounds 1～3 as 3<2<1, and those of σCsp3-O bonds increase in the opposite order (3 > 2 > 1). This fact illustrates a comparatively easier thermal decomposition of the sCsp3-O bond in compound 3 compared to compound 2, and in compound 2 compared to compound 1. NBO results indicate that these reactions are occurring through a concerted and asynchronous four-membered cyclic transition state type of mechanism.     

《原子发射光谱分析技术及应用》

该书以实际中广泛应用的发射光谱现代分析仪器为对象,介绍了原子发射光谱分析技术的原理和必要的基础知识,主要发射光谱仪器的分析技术及其实际应用。着重介绍火花源原子发射光谱、电感耦合等离子体发射光谱和辉光放电     

“借喻”在初一数学教学中的应用

5年前，笔者任教初一数学时借动画人物“阿凡提”和“蓝精灵”，帮助学生理解数学知识和数学思想方法，取得了很好的教学成效．考虑到现在的学生成长背景不同，他们是看着“喜羊羊”与“灰太狼”长大的孩子，