醇+N-甲基哌嗪二元体系的体积性质

采用振荡管式数字密度计分别测定甲醇、乙醇、正丙醇、异丙醇、丁正醇和异丁醇与N-甲基哌嗪组成的二元体系在298.15K下的密度，计算了超额摩尔体积、超额偏摩尔体积、表观摩尔体积、偏摩尔体积等体积性质，从分子相互作用角度讨论了这些二元体系的体积性质的变化规律，为N-甲基哌嗪的开发和研究提供基础数据和信息。     

Zn(Thr)Ac2·2H2O固态配合物的制备及标准生成焓

在水-丙酮混合溶剂中合成了未见文献报导的Zn(Thr)Ac2@2H2O固态配合物,通过化学分析、元素分析、IR、XRD和TG-DTG等对其组成、结构及热稳定性进行了研究.用微量热法测定了配合物在298.15 K时在纯水中的溶解焓,计算了Zn(Thr)2+(aq,∞)和Zn(Thr)Ac2@2H2O(s)的标准摩尔生成焓分别为(955.24±5.70)kJ@mol-1和(-570.92±5.71)kJ@mol-1.     

Gamow—Teller Resonance of 90Zr in a Relaztivistic Approach

We establish the formalism of nuclear spin-isospin excitations,especially the Gamow-Teller resonance in a fully consstent relativistic random-phase approximation.A relativistic form of the Landau-Migdal parameter g‘ is adopted as a residual spin-isospin correlation force.In the non-relativistic limit it reproduces the excitation energy of the giant Gamow-Teller resonance state obtained in the non-relativistic model.The Gamow-Teller resonance for finite nuclei is investigated in a relativistic approach for the first time.It is found that the Ikeda sum rule of 90Zr is quenched about 8% in the Hartree as well as the correlated strengths due to the poles of the negative Dirac states at energies above 1 GeV.     

纳米TiO_2用于甲基橙溶液的光催化氧化研究

本实验采用纳米级的二氧化钛,对甲基橙溶液进行了紫外光催化氧化处理,探讨了pH的影响和添加Fe3+的效果及反应动力学方程,结果表明,采用UV/O3/TiO2工艺对其进行处理,pH4-5时,10W紫外灯光照60min,CODcr去除率达84%,脱色率达96%以上。添加Fe3+,对溶液的催化降解速度提高不明显。动力学研究表明,CODcr降解速度对CODcr的浓度为一级反应。     

[Na(18-C-6)]2[Cu(i-mnt)2]的合成与结构分析

研究了18-冠-6与Na2[Cu(i-mnt)2][i-mnt=异丁二腈烯二硫醇阴离子,S2CC(CN)2-2]的反应,得到的配合物[Na(18-C-6)]2[Cu(i-mnt)2](1)通过元素分析、红外光谱、X射线单晶衍射进行了结构分析.配合物为单斜晶系,空间群P2(1)/c.晶体学结构数据a=1.2819(11),b=1.1793(10),c=1.4928(13)nm,β=99.121(16)°,V=2.228(3)nm3,Z=2,Dcaled.=1.369g/cm3,F(000)=958,R1=0.0521,wR2=0.1003.1中的[Cu(i-mnt)2]基团通过配体i-mnt的氮原子与两个[Na(18-C-6)]基团中的钠原子成键,形成稳定的中性配合物.     

相变光盘介电薄膜ZnS-SiO2 的微结构和光学特性

采用射频磁控溅射法制备了ZnS-SiO₂ 介电薄膜,利用透射电镜和椭偏仪研究了溅射条件对ZnS-SiO₂薄膜微结构和折射率n的影响.研究表明,ZnS-SiO₂薄膜中存在微小晶粒,大小为2～10 nm的ZnS颗粒分布在SiO₂基体中,当溅射功率和溅射气压变化时,ZnS-SiO₂薄膜的微结构和折射率n发生显著变化,微结构的变化是导致折射率n变化的主要原因,通过优化溅射条件可以制备适用于相变光盘的高质量ZnS-SiO₂介电薄膜.     

Hydrodynamic Properties of Fe3O4 Kerosene-Based Ferrofluids with Narrow Particle Size Distribution

We investigate the hydrodynamic properties of Fe3O4 kerosene-based ferrofluids with narrow particle size distribution. The ferrofluids are synthesized by improving chemical coprecipitation technique. A narrow distribution of 8.6-10.8nm particle sizes is obtained from the magnetization curve with the free-form model based on the Bayesian inference theory. The fitting result is consistent with average particle size obtained from x-ray diffraction. With the increase of applied magnetic field and magnetic particle concentration, apparent viscosity of ferrofluids increases. At concentration 4.04%, the type of flow for the ferrofluid transforms from Newtonian to Bingham plastic fluid as the applied magnetic field increases.     

液体CO2在毛细管内的质量流量及临界流实验研究

本文进行了液体CO2在长度为0.5～5.9 m,内径为0.7 mm和2.0 mm,入出口压差为2.2 MPa和2.5 MPa的毛细管内的质量流量及临界流的实验研究.实验结果表明液体CO2在毛细管中的质量流量随毛细管内径、入出口压差的增大而增大,随长度的增加而逐渐减小;结果同时表明液体CO2在毛细管中产生了临界流现象,临界流随毛细管内径的增大而增大.在实验基础上回归出了适用于本实验条件的液体CO2在毛细管内的质量流量经验关联式,具有一定的工程指导意义.     

What Is Its Real Existing Form?——Theoretical and Experimental Studies on 2-Mercaptobenzothiazole

1 INTRODUCTION The study of heterocyclic molecules with aroma- tic rings and their absorptions on metals is of con- siderable importance from both theoretical and te- chnological points of view. These molecules are in- teresting because of their applications as corrosion inhibitors and flotation collectors, and their abilities to form self-assembly layers[1]. 2-Mercaptobenzo- thiazole (C7H5NS2, in the following MBT) is an important heterocyclic molecule, which can be used as corrosion …