稀土硝酸盐与L—α亮氨酸固体配合物的合成与表征

在无水乙醇和苯的混合溶剂中,制得了稀土硝酸盐和L—a亮氨酸的6种固体配合物.经化学分析、元素分析和热重分析确定了其组成是RE(Leu)_3(NO_3)_3H_2O(RE=Pr,Nd,Sm,Eu,Gd)和Dy(Leu)_4(NO_3)_3·H_2O(Leu=Leucine亮氨酸);测定了熔点,并通过TG—DTG比较了它们的热稳定性.     

TiB_2粒子增强Ti-Al基复合材料的合成机理

采用Ti、Al和B元素粉末,经燃烧反应合成了TiB_2粒子增强的Ti Al金属间化合物基复合材料,并用DSC、EMPA和XRD等方法研究了其合成机理。结果发现,Ti和Al粉末间的放热反应促进了 TiB_2粒子的形成,所形成的 TiB_2粒子的尺寸约为2μm。将所得复合材料重熔后,TiB_2粒子的尺寸、相对含量和形貌没有明显变化,并且其显微组织比铸态Ti Al基合金组织明显细化。     

辅酶B12模型化合物的合成及性质研究——纯电子效应的轴向苄基类水溶性辅酶B12模型化合物

以电化学和光谱电化学方法探讨了合成辅酶B12模型化合物的条件。在此基础上用化学方法合成了系列轴向基团具有纯电子效应的辅酶B12模型化合物RPhCH_2-CoTMAPI(R=CH_(3-),NO_(2-),H-,Br-,KCO_(2-),COTMAP I为碘化四[N,N,N-三甲胺基]苯基钴卟啉)。以红外,紫外可见光谱对它们进行了表征。用量子化学方法讨论电子效应对Co-C键的影响。     

锡的添加对TiAl基合金的影响

研究了Sn的添加对Ti-34wt％Al合金的室温力学性能、显微组织、相组成和断口形貌的影响。试验发现,在TiAl基合金中添加Sn,能够使合金室温延性得到提高。还发现,添加1.14wt％Sn,使合金的层状组织呈较细的等轴晶,晶界光滑且较宽,合金表现出较好的室温综合力学性能,断口形貌出现准解理特征。     

Reforming of wiener index

Based on distance matrix W, the novel topological index WF is defined by the matrices X, W, L, as WF=XWL. Where X is a row matrix, which expresses the bonding characteristics between adjacent atoms; L is a column matrix expressing the characteristic of vertexes in molecules; W is a distanee matrix, which expresses the chemical environment of the atoms in the molecule, the properties, the chemical environments and the interaetion of the vertexes in a molecule are taken into account in this definition. Hence the application of the index WF to multiple bonds and heteroatomcontaining orgarlic systems or inorganic systems is possible. Good correlation coefficients are achieved not only in the prediction of the standard formation enthalpy of methyl halides, titanium halides, but also the retention index of gas chromatography of the hydrocarbons.     

Flexible organic light-emitting diodes with ITO／Ag／ITO multi-layers as anodes

The transparent ITO/Ag/ITO multi-layers are developed as anodes on flexible PET (poly(ethylene terephthalate)) substrates. The influence of these anodes on FOLED (Flexible Organic Light-emitting Diodes) is investigated. From the results of research, it can be seen that the multi-layer anode has optimum characteristics, whose sheetresistance is 11 Ω and optical transmittance is about 80%,when the thickness of Ag sandwiched by two ITO layers is in the range of 14--18 nm. It is demonstrated that the OLED devices with multi-layer anodes give better luminescence and higher efficiency compared with those with single ITO anodes.     

Relationship between toxicity and molecular volume of dioxins,organic phosphorous compounds and <Emphasis Type="Italic">n</Emphasis>-alkanols

The molecular volumes of dioxins, organic phosphorous compounds and n-alkanols were computed at the B3LYP/6-311G** level, and were then correlated with their toxicity. It was surprisingly found that there exists the so-called “critical volume of toxicity“ (CVT) in each series of compound of the present study, i.e. the toxicity increases with increase of the molecular volume when less than CVT, while decreasing with increase of the molecular volume when larger than CVT. The CVT for the three series of compounds is quite similar, ranging 0.309----0.320 nm^3. It was proposed that the ordinary linear solvation energy relationship (LSER) should be modified with respect to the new findings, and accordingly the anaesthetic potency of partial fluorinated n-alkanols was predicted.     

不同的施肥方式对土壤脲酶和过氧化氢酶活性的影响研究

本文研究了尿素、有机肥(菜饼)单一/复合施肥方式对土壤脲酶和过氧化氢酶活性的影响。研究结果表明:单施尿素在短期内能有效的增强土壤脲酶活性,但对土壤过氧化氢酶活性影响较少。单施有机肥(菜饼)能有效的增强土壤脲酶和过氧化氢酶活性,但比施加同一浓度尿素时对脲酶活性的促进作用小。复合肥与单一施肥尿素或者有机肥(菜饼)量相同时,复合肥对土壤脲酶和过氧化氢酶活性有更强的促进作用,并且高脲酶和过氧化氢酶活性能保持较长时间,在第30d时,脲酶和过氧化氢活性还保持了较高的水平。     

高职英语教育基础性与实用性有机结合的有益尝试--《基础英语教程》与《交际英语教程》述评

我国高等专科非英语专业英语教育费时低效，教材内容与大纲词汇表滞后是其原因之一。教材由于侧重语言知识的基础性，忽视了语言的实用性，结果是学生英语语言知识学了不少，但其实用性不大。而今以高等专业技能实用型人才为培养目标的高职教育需要外语教学改革，要把英语教育的基础性与实用性有机结合起来。为此，首先应从教材的编写上着手进行探索。《基础英语教程》与《交际英语教程》在这方面做了有益的尝试。     

MOCVD法制备金属-陶瓷功能梯度材料的研究

利用金属有机化学气相沉积（MOCVD）方法，以Mo（CO）6，Si（OC2H5）4为物源，在Al2O3陶瓷基片上制备了金属一陶瓷功能梯度材料，并用XPS，XRD，SEM等技术对其成分分布，物相组成和表面形貌进行测试和表征，结果表明：材料的组成沿厚度方向呈连续梯度变化，符合功能梯度材料的变化规律。