双硫腙水溶液的极谱研究

用单扫描极谱法和循环伏安法研究了双硫腙在酸性和碱性水溶液中的极谱行为.在碱性介质中,有三个还原波-0.63,-0.52和-0.45V,分别对应于双硫腙阴离子,它的氧化产物四氮化合物和二硫化合物的还原过程,在酸性介质中,只有一个-0.18V的双硫腙还原波.上述波的电极反应和特征也讨论了.     

多壁碳纳米管-酰基吡唑啉酮复合膜修饰电极测定异烟肼

报道了一种修饰电极--多壁碳纳米管-酰基吡唑啉酮复合膜修饰玻碳电极(MWNTs/HPMαFP/GCE ),研究了异烟肼在此修饰电极上的电化学行为及反应机理.与裸GCE和MWNTs/GCE相比,异烟肼在MWNTs/HPMαFP/GCE上的氧化峰电流和检测灵敏度大大提高,表明多壁碳纳米管和酰基吡唑啉酮产生了协同增效作用.在...     

酸性咪唑类离子液体催化合成2-氯丙酸乙酯

研究了酸性咪唑类离子液体中2-氯丙酸乙醇的合成.制备了4种咪唑类离子液体作为催化剂用于酯化反应,通过Hammett方法测定其酸度,讨论了酸度-催化活性之间的关系.实验发现[Hmim] HSO4拥有比其它几种离子液体更好的催化效果.考察了离子液体用量、反应物配比、反应时间和反应温度对反应结果的影响.得到较佳的反应条件:n...     

Photonic Bandgap Properties of Atom-lattice Photonic Crystals in Polymer

The present paper covers the various photonic crystals(PhCs) structures mimicking real atom-lattice structures in electronic crystals by using the femtosecond laser-induced two-photon photopolymerization of SU-8 resin. The bandgap properties were investigated by varying the crystal orientations in <111>, <110> and <100> of diamond-lattice PhCs. The photonic stop gaps were present at λ=3.88 μm in <111> direction, λ=4.01 μm in <110> direction and λ=5.30 μm in <100> direction, respectively. In addition, defect...     

丁酸甲酯单分子解离的非谐振效应

使用MP2/6-311++G（2d,2p）方法和基组,计算了丁酸甲酯单分子解离反应体系详细的势能面。应用RRKM理论,计算了在1000-5000 K的温度范围内的正则系综的速率常数。与此同时,在微正则系综下,我们计算了温度为1000-5000 K对应的能量从451.92到1519.52 kJ·mol^-1的速率常数。计算结果表明反应通道2、4和5的非谐振效应比较明显。因此对于丁酸甲酯单分子解离反应体系来说其非谐振效应是不能忽视的。     

Analysis of Low-polar Ginsenosides in Steamed Panax Ginseng at High-temperature by HPLC-ESI-MS/MS

A high performance liquid chromatography coupled with electrospray ionization-tandem mass spectrometry( HPLC-ESI-MS/MS) method was developed for the analysis and identification of ginsenosides in the extracts of raw Panax ginseng(RPG) and steamed Panax ginseng at high temperatures(SPGHT). A total of 25 ginsenosides were extracted include of which 10 low-polar ginsenosides, such as ginsenosides F4, Rk3, Rh4, 20S-Rg3, 20R-Rg3 and so on, were identified according to their HPLC retention time and MS/MS data. The results indicated that the low polar ginsenosides were seldom found in RPG. For the exploration of the transformation pattern of the ginsenosides in steam processing, the standards of ginsenosides Re, Rg1, Rb1, Rc, Rb2, Rb3 and Rd were selected and hydrolyzed at a temperature of 120 ℃. The results show that these polar ginsenosides can be converted to low-polar ginsenosides such as Rg2, Rg6, F4, Rk3 and Rg5 by hydrolyzing the sugar chains.     

EAST装置离子回旋加热天线电流带热结构分析

介绍了EAST装置新型离子回旋加热(ICRH)天线电流带的设计结构。通过对电流带实际工况的计算得出电流带的工作温度分布,以此来模拟实际工作条件下电流带的热载荷承受能力以及对电流带结构的影响。论证了在实际工况热载荷条件(0.2MW)下,电流带辐射面温度及电流带整体结构强度满足设计要求。     

Schiff碱型羧酸开链冠醚和Cu(Ⅱ)配合物配位结构的研究

通过对Schiff碱型羧酸开链冠醚与Cu（Ⅱ）所形成的配合物之组成、最大吸收波长（λmax），差工线以及配合物的红外光谱的测定，获得了这些配合物的配位结构信息。     

N,N-二(2-苯并咪唑亚甲基)甲胺高氯酸盐的晶体和电子结构

合成了三齿配体N,N-二(2-苯并咪唑亚甲基)甲胺(MN3)的高氯酸盐.对该化合物进行了元素分析、紫外和红外表征;采用X射线衍射方法测定了该化合物的晶体结构,依据晶体结构数据使用G98程序对配体(MN3)进行了量子化学计算.     

Design and Construction of 3D Porous Na3V2(PO4)3/C as High Performance Cathode for Sodium Ion Batteries

An easy and delicate approach using cheap carbon source as conductive materials to construct 3D sequential porous structural Na3V2(PO4)3/C(NVP/C)with high performance for cathode materials of sodium ion battery is highly desired.In this paper,the NVP/C with 3D sequential porous structure is constructed by a delicate approach named as“cooking porridge”including evaporation and calcination stages.Especially,during evaporation,the viscosity of NVP/C precursor is optimized by controlling the adding quantity of citric acid,thus leading to a 3D sequential porous structure with a high specific surface area.Furthermore,the NVP/C with a 3D sequential porous structure enables the electrolyte to interior easily,providing more active sites for redox reaction and shortening the diffusion path of electron and sodium ion.Therefore,benefited from its unique structure,as cathode material of sodium ion batteries,the 3D sequential porous structural NVP/C exhibits high specific capacities(115.7,88.9 and 74.4 mA·h/g at current rates of 1,20 and 50 C,respectively)and excellent cycling stability(107.5 and 80.4 mA·h/g are remained at a current density of 1 C after 500 cycles and at a current density of 20 C after 2200 cycles,respectively).