In order to improve the corrosion resistance of magnesium alloy,the surface of magnesium alloy was hydrothermal treated and surface passiviated by low-surface-energy molecules successively.The surface structure,composition,and wettability were characterized by scanning electronic microscopy(SEM),X-ray diffraction(XRD),and water contact angle meter,respectively.The results showed that a layer of Mg(OH)2 with rough structures was generated on the substrate surface,and it became superhydrophobic(water contact angle of 158.5°,sliding angle of 8°) after passiviated with low-surface-energy molecules.Electr℃hemical experimental results indicated that the so-obtained superhydrophobic surface possessed excellent corrosion resistance.

Composites of carbon fiber is widely used,but manufacturing carbon fiber needs a great deal of cost,so it will produce a significant economic benefits if there is a good method to recycle carbon fiber.The Writers make a studying on the method of incineration,concluded that the most appropriate temperature is 550 ° c through the experiment by setting a series of temperature gradient.Then take the recycled carbon fiber as a raw material combines with the new resin to make regenerated composite material by hand lay-up,when testing the tensile strength and impact toughness between the regenerated composite material and intact composites,it`s found that the performance of regenerated composite material only between 35% to 40% percent of intact composites.It`s easily to produce the phenomenon of Stress concentration by analyzing experimental process.The heating rate of resin content and curing process will affect the properties of the recycled material.

借助于城市体系的相关理论分析了自然科学基金资金面上项目的分布法则,并且对各学科基金分布的空间差异以及离散度进行了测度。发现自然科学基金的分布比现有城市体系更符合城市的位序-法则(Rank-Size Rule),在面上基金获得方面,东南部城市表现更优异。这预示将来南方城市会进一步增强自己在中国创新体系中的地位。学科分布方面,根据方差公式得出:信息科学、地球科学、工程与材料科学、化学科学在空间分布上比较分散,其它学科基金分布相对集中。

This paper applies grey cluster relation analysis method in water environmental quality assessment to introduce its method and procedure.After using this method to evaluates Xingping,Nanying,Tieluqiao and Zhonglong monitoring sections of Weihe River in Xianyang based on the year of 2005 water quality monitoring result,water quality of four monitoring sections are classified to Ⅴ,whose order is Nanying>Xingping>Zhonglong>Tieluqiao,and the most serious factors contributed to pollution are pointed out.According to which this paper can provide references for water pollution control and water environment protection.

Bases on evaluating the ability of sustainable development in regional ecological city construction,take Xianyang City for example,an evaluating index system was introduced.Those indexes are then made dimensionless by the way of averaging procedure and some cost indexes were handled by positive correlation process.Finally,the grey relational grade and grey relational coefficient were calculated by applying grey relational method.From the result,the different levels of ecological city sustainable development can be classified and the primary restriction can also be pointed out.The result of grey relational degree indicates that the sustainable development ability of Xianyang City is going better and better,and there are 10 indexes that have a great gap with the optimized ones.Then according to the results,the faults in Xianyang ecological city construction were pointed out and some countermeasures for realizing the goal of sustainable development drawn up.

患者女,45岁.自发现双腋窝包块20 a余,偶有月经前胀痛.查体:左侧腋下可触及3.2 cm×1.8 cm×1.8 cm椭圆形肿块,质硬,其内可触及一包块,质韧,活动度可.边界清楚,轻压痛.右侧腋窝旁有一约1.5 cm×1.0 cm×0.5 cm大小包块,质韧,其边界清楚.无压痛,表面皮肤无红肿溃烂改变,无乳头和乳晕.

The paper presented a case history of attaining the development potential of circular economy for a large integrated lead-zinc plant in Shanxi Province,China.The existing energy and material flows were first reviewed and analyzed based on the circular economy concept;the author then proposed a closed loop industrial chain model consisting of smelting,acid production,electricity generation and precious metal recovery operations.The construction of an industrial chain of circular economy for the lead-zinc plant improved its utilization of material and water resources,reduced energy consumption and manufacturing cost,minimized pollutant discharge,increased economic efficiency,and produced many environmental benefits.

Selecting nineteen indexes from three aspects and applying SPSS13.0 software,this paper analyzes spatial differences in urban land use level based on the principal components analysis and evaluates the urban land use level.The results indicate that the urban land use level is closely related to five factors,including synthetic level of land use,urban construction scale,social development level,capability of sustainable development,population and that the general land use level in central China is the highest,which declines respectively in east China and in west China,and three regions behave differently when different factors are concerned.

Objective: To investigate the expressions of VEGF and CD44V6 in breast cancer tissues,and explore their correlation to lymphatic metastasis and different clinical TNM stage.Methods: The expressions of VEGF and CD44V6 in 53 samples of breast cancer tissues were detected by SP immunohistochemistry.Results: The positive rates of VEGF and CD44V6 in 53 samples of breast cancer were 79.2% and 64.2%.The positive rates of VEGF and CD44V6 were correlated with lymphatic metastasis(r was 0.496and 0.381)and clinical TNM stage(r was 0.412 and 0.609),with significant difference(P0.05).Conclusion: The expressions of VEGF and CD44V6 in breast cancer tissues may be cooperative effects in the occurrence and they could be used as an important biologic marker for breast cancer.