浅谈对高校新教师的备课指导

对高校新教师应进行备课指导,要求他们层层了解课程的背景材料,懂得备课的几种形式和基本规范,注意收集教学反馈情况,逐步提高教学艺术水平。     

语言实验室安装前的准备及竣工后的验收

安装前的准备工作和竣工后的验收工作是影响语言实验室正常运行的两个重要因素．文章针对上述两点进行阐述．     

投产采区片盒斜井开准方式应用分析

本文以资兴满春岭井为例，运用方案比较法系统分析了笔者提出的“投产采区片盘斜井开拓准备方式”，指出该法简化了开拓部署，改革了采区布置，具有明显的社会经济效益，尤其适合在南方小井推广。图２，表１，参４。     

高频等离子体化学气相淀积法制备TiO2超细粒子

利用ＴｉＣｌ４＋Ｏ２体系，在高频等离子体化学气相淀积反应器中合成了纯度高、粒度细的ＴｉＯ２粒子。考察了工艺条件对ＴｉＯ２粒子物性的影响；探讨了ＴｉＯ２粒子晶型控制的方法，金红石型质量分数可通过工艺条件控制；探讨了ＴｉＯ２粒子晶型控制的方法。金红石型质量分数可通过工艺条件控制，减少ＴｉＯ２单体浓度可提高金红石型质量分数；也可通过在原料ＴｉＣｌ４中添加ＡｌＣｌ３等晶型转化剂，使可转化为单一金红石型Ｔｉ     

A New Way of the Skeletal Metals Synthesis

1 Results Strongly disordered metals with the high chemical and catalytic activity are often called as skeletal metals.Usually for their preparation the metallides of d-metal (which afterwards will be left in the “skeleton“) and chemically active component(s) are firstly synthesized.Then the last one(s) is (are) removed by the leaching with aqueous solutions of alkalis or carbonates.However,this method sometime fails,first of all,for the reactions,which should be realized in non-aqueous conditions.In th...     

2,2''-位置上带有不同取代基的联萘化合物的合成及应用

概述了2，2‘-位置上带有不同取代基的1，1‘联萘化合物，如2－氨基－2‘-羟基－1，1‘-联萘、2－羟基－2‘-巯基－1，1‘-联萘和2－氨基－2‘-巯基－1，1‘-联萘的制备及在不对称合成中的应用研究进展。     

Improvement in hydrogen storage performance of Mg by mechanical grinding with molten salt etching Ti3C2Clx

Mg-based materials are currently a hot research topic as hydrogen storage materials due to their considerable theoretical hydrogen storage capacity. However, the kinetic performance of hydrogen absorption and desorption of Mg is too slow and requires high temperature, which seriously hinders the application of this material. MXene is a new type of two-dimensional material with significant role in improving thermodynamics and kinetics. In this experiment, a two-dimensional layered MXene containing Cl functional group was prepared by molten salt etching using the Ti-containing MAX phase as the raw material. Then different ratios of Ti₃C₂Cl_x were uniformly dispersed onto the surface of Mg by high energy ball milling. The samples were characterized by hydrogen absorption and desorption kinetics, SEM, XRD, XPS, and DSC to investigate the effect of Ti₃C₂Cl_x on the hydrogen absorption and desorption performance of Mg. The onset hydrogen absorption temperature can be reduced to room temperature and the hydrogen release temperature is reduced by 200 ​°C by doping Ti₃C₂Cl_x. And there is also 5.4 ​wt% hydrogen storage in the isothermal hydrogen absorption test at 400 ​°C. The results of DSC demonstrate that the E_a of Mg+15 ​wt% Ti₃C₂Cl_x was reduced by 12.6% compared to pristine Mg. The ΔH is almost invariable. The results of XPS show that the presence of multivalent Ti promotes electron transfer and thus improves the conversion between Mg²⁺/Mg and H⁻/H. This study provides a guideline for further improving the hydrogen absorption and desorption performance of Mg-based hydrogen storage materials.     

一种含5-硝基间苯二甲酸和菲咯啉配体的超分子化合物：结构表征，光致发光和电化学性能

采用水热法合成了含混合配体的铜配合物[CuClPhen]⁺·[HL]^-·2H₂O（HL=5-硝基间苯二甲酸,Phen=1,10-菲咯啉）,其结构由单晶X射线晶体学确定。标题化合物在三斜空间群P-1的晶体化合物。标题化合物的晶体数据：C₃₂H₂₄ClN₅CuO₈,M_r = 704.54,a = 10.4044(5),b = 12.3912(9),c = 12.4632(9)Å,α = 73.859(6),β = 85.036(5),γ = 78.202(5)^°,V = 1510.09(17) ų,Z = 2, T = 293(2) K,D_c = 1.549 g/cm³,μ(MoKα) = 0.874 mm^-1,F(000) = 720.0,R = 0.0554,wR = 0.1434,GOF = 1.098。当用作超级电容器电极材料时,所制备的配合物具有高比电容、良好的循环稳定性和优良的倍率性能。在1mol/L KOH溶液中,最大比电容可达到69 F/g。在2 A/g电流密度下,10000次循环后比电容保持率为72%。标题化合物是一种潜在的红色光致发光材料。     

Preparation of enantiomerically pure 1,1′-bi-2-naphthols from 85% cinchonine and 1,1′-bi-2-naphtholboric anhydride

A possibility of preparation of enantiomerically pure 1,1′-bi-2-naphthols using an impure cinchonine has been examined. The solid and the mother liquor formed from the reaction of 1,1′-bi-2-naphtholboric anhydride and 85% cinchonine in toluene could give optically pure (S)-(−)- and (R)-(+)-1,1′-bi-2-naphthol after acidification and kinetic crystallization, the overall yields were 40% and 28%, respectively. Supported by the National Natural Science Foundation of China (2937206) and the Natural Science Foundation of Hubei Province (93J27) Xiong Ying, born in 1971, Graduate student     

固体非酸催化合成硬脂酸乙二醇酯

在固体非酸催化剂作用下,使硬脂酸和乙二醇反应制取硬脂酸乙二醇酯。考察了反应原料配比、催化剂用量、反应时间等因素对酯化的影响。在酸酶摩尔比为1：1．1,催化剂用量为1％的条件下,硬脂酸乙二醇酯的产率较高。