Ceric ammonium nitrate supported HY-zeolite：An efficient catalyst for the synthesis of 1, 8-dioxo-octahydroxanthenes

Ceric ammonium nitrate （CAN） supported HY-zeolite has been used as an efficient catalyst for the one- pot synthesis of 1,8-dioxo-octahydroxanthenes from the readily available 1,3-diketone and aromatic aldehydes under solvent-free conditions. The present methodology is cost-effective in addition to other advantages like high yields of products in shorter reaction time and simple workup procedure without the use of any injurious solvents.     

Theoretical Studies on Structures and Electron Affinities of 5-and 6-Halouracils

The molecular structures and electron affinities of 5-and 6-halouracils(XU,X=F,Cl,Br) were determined by means of five different density functional methods. The basis set used in this work is of double-ζ plus polarization(DZP) quality with additional diffuse s-and p-type functions,denoted DZP++. The geometries were fully optimized with each density functional theory(DFT) method,and discussed. Three different types of the neutral-anion energy separations reported in this work are the adiabatic electron affin...     

安捷伦隆重推出适用于多种应用的全新涡旋干式真空泵

安捷伦科技公司近日隆重推出独立气路设计的IDP-15干式涡旋泵。IDP-15的抽速为15.4m3/h(60Hz),真空获得速度快,是学术、研究、分析仪器和工业应用的理想选择。该产品显著降低了噪声,无震动,单面涡轮设计使其具有极低的使用成本,年度维护非常简单。IDP-15是安捷伦公司广受欢迎的TriScroll     

专利

<正>钒铁中磷的分析方法申请公布号:CN103994996A申请公布日:2014.08.20申请人:攀枝花学院摘要公开了一种钒铁中磷的分析方法。该方法包括如下步骤:(a)样品处理;(b)氧化还原;(c)定容过滤;(d)显色;(e)试剂空白;(f)测定吸光度;(g)绘制工作曲线;(h)分析结果计算。本发明可用于钒铁中不同磷含量的测定,解决了现行国标GB/T 8704.7-2009钒铁中磷含量的测定方法流程长、操作过于繁琐、准确度较低、操作重现性较差、检测成本较高等问题。在大量钒存在的情况下,依靠试剂掩蔽     

对当前物理教学改革的几点看法：在中国物理学会教学委员会第七届一次全体（

就当前物理教学改革中的几个问题发表了自已的看法。     

在电子信息类新高职专业中如何培养学生的实践能力

根据电子信息类新高职学生的培养目标 ,研究了在课堂教学、实验测试、综合制作、课外活动和学生兴趣培养中如何提高学生的实践能力问题 ,实际结果表明 ,我们的措施和方法是可取而有成效的。     

BrФnsted Acidic Ionic Liquids: Novel Efficient,Cost-effective and Reusable Solvent-catalysts for Ritter Reaction

Several Brnsted acidic ionic liquids(ILs) were synthesized and used as dual solvent-catalysts for the Ritter reaction of benzonitrile with tert-butanol. In particular, IL11([NSPTEA][OTF]) showed excellent catalytic activity for the Ritter reaction. In the presence of IL11, various nitriles and tertiary alcohols as well as secondary alcohols were converted smoothly to the corresponding amides in good to excellent yields. In addition, this cost-effective ionic liquid [NSPTEA][OTF] was easily separated from the reaction mixture by extraction with a small amount of water, and was recycled five times without any significant loss in activity.     

考虑碳硫成本的集装箱海运中转港选择模型

近年来,海运中二氧化碳与二氧化硫的排放引起了各方的重视,国际海事组织与欧盟等国开始引入措施来控制海运中二氧化碳与二氧化硫的排放,因此,将低碳和低硫理念引入集装箱海运规划问题上具有很大现实意义.在考虑碳硫成本的情况下,基于船公司成本最低,建立了考虑碳硫成本的集装箱海运中转港选择模型.在此基础上,通过算例分析研究了出口箱量如何在中转港间进行分配才能使航运公司担负的总成本最低,为公司选择出口中转港做出正确的决策.