Alumina concentration distribution in typical areas of 400 kA aluminum reduction cell was studied.The results show that alumina concentrations have big fluctuation at different time points in different areas of aluminum reduction cell,and the closer to the end position,the denser the alumina concentrations is.Alumina concentrations show a trend of reduction first and increase the later,the maximum value appears near the two end position,and the minimum value appears in the middle of cell.Alumina concentrations have the similarity distribution curve of symmetric position in input side and output side,and alumina concentration in output side is higher than that of symmetric position in input side.Alumina concentration can maintain a large proportion between 1.00％ ～2.00％,and control of low alumina concentration is realized.

Ursonic acid benzyl ester(2) was obtained by benzylation from ursolic acid.Ester protected ursolic acid-3-glucosides(4a~4d) were obtained by glycosylation reaction of 2 with trichloroacetimidate.Four ursolic acid-3-monoglycosides(6a~6d) were synthesized by deprotection of benzyl and benzoyl from 4a~4d, respectively.Among them, 6c was a novel compound.The structures were characterized by 1H NMR, 13C NMR and MS(ESI).

In order to effectively use the medium of cordyceps militaris polysaccharide , this thesis carry out a sys-tematic comparison and verification through experiments and come to the best extraction conditions: extraction tem-perature 90℃, extracted times 4, the number of extraction time 60min, extraction ratio of material to liquid 1:10. Cordyceps polysaccharide extraction rate of 3.84% can be achieved.

Carbon nanotubes were widely used in various fields of new material , electronic information , with good electrical conductivity , distinctive mechanical property and favorable adsorption property.The structure , preparation , properties, and application progress in electronic , material engineering and environmental protection were reviewed.The development of carbon nanotube was analyzed and the application prospect of carbon nanotube was also forecasted .

Using the DSC method to study PA1212 -b -PEG under the different temper~tture decrease speed crystal- lization process, its non -uniform temperature crystallization dynamics was studied with the Avrami equation. In non- i- sothermal crystallization process, as the cooling rate increase, the crystallization temperature was decreased. The compre- hensive utilization Avrami equation obtained the Avrami index was 4, and showed that crystalline was heterogeneous nucle- ation and growth of three- dimensional.

In the non-hydrodesulfurization,the alkylation desulfurization technology has obvious advantages in terms of desulfurization rate.The common catalysts for desulfurization are summed up here and their advantages and disadvantages are explained in a comparative way.

Trans fatty acids(TFA) formation pathway,the major food sources of trans fatty acids and the major harms to human health are described.The analysis and detection methods such as gas chromatography,infrared spectroscopy,Ag ion chromatography,capillary electrophoresis are reviewed.The advantages and disadvantages of each method are compared.

实验教学是高职高专教学内容的重要组成部分,结合高职高专的教学特点,根据基本实验、综合实验和设计实验重新构建实验课程体系,优化实验教学内容和教学方法,更新实验项目,开放实验室,开展研究性实验教学方法,为培养高职高专学生的创新能力做了尝试,并获得初步成功。

A new plant growth regulator,2,3,5-tribrominylbenzoic acid,is synthesized with O-amino benzoic acid as raw materials,by bromide,diazotization under acidic conditions,with the catalyst in the presence of nitrogen release,substitution reactions and so on.Comparison tests are carried out on crops with samples solution,and the results show that 2,3,5-tribrominylbenzoic acid has obvious yield-increasing effect,and it has the value of popularization.

This paper illustrates the importance of information retrieval course and discusses some problems concerning how to compile higher education textbook in network environment,how to develop the training of network retrieval and how to reform on-line examination.

The present status of chemical fertilizer utilization efficiency in our country is analyzed in this paper.It is pointed out that a lot of non-reproduceable resources,energy and fund are wasted,environmental pollution are intensified,human health are harmed due to the low utilization efficiency of chemical fertilizer.Some discussions on raising the chemical fertilizer utilization efficiency are carried on.It is suggested that the improvement of chemical fertilizer utilization efficiency should be put on a more important position in the guiding ideology.The concept should be changed from raising chemical fertilizer production capacity,output and enlarging chemical fertilizer employing amounts to attaching importance to chemical fertilizer utilization efficiency.Especially,the project of formula fertilization based on soil testing should be extended,the fertilizer innovation should be strengthened.The new model of according to demand fertilization by farmer,according to demand supplying fertilizer by merchant and according to demand producing fertilizer by factory should be established.It will make chemical fertilizer utilization efficiency reach the expected high level in our country.