唐山市水环境保护工作的几点做法

河北省唐山市水环境保护范围包括滦河流域，沙、陡河流域，还乡河流域，北三河流域，共有河流70多条，大型水库2座、中型水库3座、小型水库152座。全市正常年份可用水量31．86亿m^3,2006年污水排放量3．8909亿m^3．其中工业污水2．8473亿m^3．生活污水1．0436亿m^3.近年来．该市不断加大水环境保护工作力度，取得了显著成效，滦河、还乡河、沙河、陡河、蓟运河等主要河道水质有了明显改善。[第一段]     

从文化变迁谈民族服饰的演变

随着国际交流的日益加深，人们讨论的重点多是跨文化的接触以及频繁接触中的文化认同问题。西方许多领域的学者已把“西方中的东方”（the East in the west）纳入他们的研究领域中。因此，我们随处可以读到西方人有关中国文化的评论。服饰文化研究者也应学会认识异域文化（the West in the East），本文通过对民族服饰变异实例的研究，探索促成民族服饰变异的文化因素和历史根源，从而揭示文化变迁与服饰变异的关系。     

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��Adopting the surface analysis and surplus value treatment,the sub-crests covered by the main structure have been circled on the structure map of the top of Yangxin series in Wolonghe gas field,As compared with drilling,the result is very good,The drilling succes ratio is 53.8% on the positive surplus value area,and 66.6% on the sub crest. Popularizing this method will lead to a visible raise of economic profit.     

Continuous formation of slurry ice by cooling water–oil emulsion in a tube

Water-silicone oil emulsion with an additive, (C₂H₅O)₃SiC₃H₆NH₂, was examined as a heat storage material. A spiral tube used as a heat exchanger was immersed in a low temperature bath and the emulsion was circulated in the tube to make ice continuously. Ice was separated from the ice–liquid suspension in an outlet tank. The amount of formed ice, the temperatures of the inlet and the outlet of the heat exchanger, and the temperatures in the tube wall were measured and the overall heat transfer coefficient and the heat flux through the tube were calculated. Experiments were carried out, varying the flow rate, the temperature of cooling brine, and the thickness of tube wall. The condition under which slurry ice was formed continuously without adhesion of ice to the cooling wall was clarified. Though decrease in the thermal resistance of the tube increased the rate of ice formation or raised the brine temperature, it narrowed the range of the flow rate and of the brine temperature in which slurry ice was formed continuously.     

DNA/lipid complex organogel with shape‐memory behavior

DNA and amphiphilic N,N,N‐trimethyl‐N‐hexadecylammonium bromide (THAB) were stoichiometrically mixed together to produce a DNA–lipid complex, which was dissolved in dimethyl sulfoxide (DMSO) at 65°C and then crosslinked with isophorone diisocyanate (IPDI). The obtained organogel swelled reversibly in DMSO, responding to the variation of temperature. Interestingly, we observed that the gel exhibited a temperature‐dependent shape‐memory behavior. Above 65°C, whatever the shape the gel was deformed to, it could retain the new shape as the temperature was decreased to room temperature, while, when the gel was heated to 65°C again, it could recover its initial shape. The shape‐memory characteristic is supposedly originated from the transition between the close‐packed and the destroyed DNA/lipid conformation. The elastic urethane crosslinking bonds between base‐pair sites act as a fixing phase. The gel holds promise in its application as a gentle actuator. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 259–263, 2002     

杂质元素对金属镝压缩强度的影响

研究了金属镝中所含Ｓｉ、Ｃａ、Ｆｅ和Ｏ４种杂质元素对其压缩力学性能的影响。结果表明，Ｓｉ元素和Ｏ元素含量的增加会降低镝的压缩强度，与此同时，其塑性也有明显地降低。金属镝中所含Ｃａ元素和Ｆｅ元素对其压缩强度的基本没有影响。     

Vertex-based inter-frame boundary encoding scheme

The boundary is approximated by a polygon which can be encoded with the smallest number of bits for maximum distortion. The temporal redundancy between two successive frames is efficiently removed with the proposed scheme, resulting in a lower bit rate than the conventional algorithms     

Halogen-induced charge transfer polymerization of pyrrole in aqueous media

Simultaneous polymerization and doping of pyrrole have been carried out in the presence of a halogenic electron acceptor, bromine (Br₂) or iodine (I₂), in aqueous dispersion or in a two-phase solvent system. The morphology of the polypyrrole (PPY) so produced is granular and porous. The electrical conductivity of the PPY-I₂ charge transfer (CT) complex is of the order of 10¹ ohm⁻¹ cm⁻¹ while that of the PPY-Br₂ complex is about one order of magnitude less. Both complexes are stable in the atmosphere. The physicochemical properties of the PPY-I₂ and PPY-Br₂ CT complexes prepared under various experimental conditions are examined in detail.