保证保险在国际工程承包中的应用

阐述了保证保险的概念、遵循原则以及在现代国际工程承包中的应用。对国际工程承包中所涉及的有关保函进行了务实的探讨,分析了其各自的特点,并提出了应用中需注意的问题,从而帮助承包商在国际工程承包市场中正确赢得项目。     

Preparation of cis‐1,4‐Polyisoprene Electrospun Microfibers

cis‐1,4‐Polyisoprene, a significant industrial elastomer, is electrospun into different nanostrucutures. Cis‐1,4‐polyisoprene electrospun fibers are prepared from cis‐1,4‐polyisoprene solutions in dichloromethane or chloroform and characterized by environmental scanning electron microscope and Fourier‐transform infrared spectroscopy. ESEM observation reveals that the cis‐1,4‐polyisoprene fibers show a bamboo‐like morphology with a nearly constant node distance, a diameter of 20–60 µm and a length of about 300 µm. In addition, within the individual nodes parallel grooves are clearly seen, which is very promising for their use in microprinting in the field of microelectronics. Smooth cis‐1,4‐polyisoprene fibers with a diameter of 5–8 µm can be obtained via electrospinning its chloroform solutions. In contrast to most polymers, the jet of cis‐1,4‐polyisoprene does not split during the electrospinning processes, which facilitates the collection of highly aligned fibers by using a rotating mandrel as a ground target.

     

State transition of macroscopic supramolecular hydrogel by the host-guest coverage effect

In this work, a hydrophobic guest monomer containing adamant end-group was synthesized and introduced into the acrylamide hydrogel system to prepare macroscopic guest hydrogel. The swelling, transparency, and mechanical properties of the guest hydrogels can be significantly changed by soaking the guest hydrogel into hydrophilic cyclodextrin solution because the hydrophobic guest groups were recognized and covered by the hydrophilic host molecules. In addition, the surface lubrication property could be adjusted by changing the proportion of acrylamide and adamantane monomers in the hydrogel system. More importantly, cyclodextrin can bind with adamantane through host-guest interactions, enabling the adjustment of the hydrophilicity/hydrophobicity properties of the hydrogel system. By controlling the assembly time, the hydrogel with different lubrication behaviors can be obtained. The controllable surface friction that this specific binding of host-guest interaction has broad application prospects in intelligent device, bionic lubrication and other fields.     

Three-dimensional Extension of the Unit-Feature Spatial Classification Method for Cloud Type

T We describe how the Unit-Feature Spatial Classification Method (UFSCM) can be used operationally to classify cloud types in satellite imagery efficiently and conveniently. By using a combination of Interactive Data Language (IDL) and Visual C++ (VC) code in combination to extend the technique in three dimensions (3-D), this paper provides an efficient method to implement interactive computer visualization of the 3-D discrimination matrix modification, so as to deal with the bi-spectral limitations of traditional two dimensional (2-D) UFSCM. The case study of cloud-type classification based on FY-2C satellite data (0600 UTC 18 and 0000 UTC 10 September 2007) is conducted by comparison with ground station data, and indicates that 3-D UFSCM makes more use of the pattern recognition information in multi-spectral imagery, resulting in more reasonable results and an improvement over the 2-D method.     

塔里木盆地哈6区块奥陶系碳酸盐岩古岩溶储层特征识别及地质建模

塔里木盆地哈6区块奥陶系储层为碳酸盐岩古潜山岩溶缝洞型储层,其储集空间类型包括生物体腔孔、生物钻孔、粒内溶孔、铸模孔、溶蚀孔洞、断层和裂缝、未塌陷的溶洞洞穴系统、塌陷型溶洞—洞顶缝系统等。针对哈6区块奥陶系碳酸盐岩塌陷型溶洞—洞顶缝系统建立了缝洞体形成模型、井震模型、地震正演模型和油气藏模型,提出地震"串珠状"反射体实为大型缝洞体的反映,而大量的地下暗河溶洞段目前的地震技术仍然无法有效识别。针对洞顶缝进行了定义,提出溶洞上部塌陷形成的洞顶缝系统是哈6区块奥陶系碳酸盐岩主要的油气产层,其次塌陷型溶洞体本身也是主要的油气产层,但可通过洞顶缝系统采出其中的油气,因此洞顶缝概念的提出对钻井、录井和油气酸化压裂测试和试采具有重要意义。     

含有风电与光伏发电以及电动汽车的电力系统概率潮流

建立含有风电、光伏发电和可入网电动汽车（PEV）的电力系统概率潮流模型。基于历史气象数据对不同季节和不同天气状况下的风光数据进行模拟,并计及风电、光伏发电、PEV充／放电及负荷的不确定性,在此基础上,对不同季节中每日不同时段的电力系统采用三点估计法（3PEM）进行概率潮流计算,进而计算潮流结果的统计特性。某140节点配电系统的仿真结果验证了所提模型和方法的准确性。     

水性聚氨酯/SiO2纳米杂化物改性水性聚氨酯涂膜性能研究

采用溶胶-凝胶法制备出水性聚氨酯(WPU)/SiO2纳米杂化物(WPUS),将WPUS和水性聚氨酯乳液复配制得复合涂膜。通过纳米粒度仪测定了WPUS及不同WPUS含量复合乳液的粒径及其分布;通过原子力显微镜(AFM)、紫外-可见光分光光度计、拉伸实验机、视频高速接触角测量仪和吸水率测试等研究了不同WPUS含量复合涂膜的微观形貌和性能。结果表明:随WPUS含量增大,复合乳液的平均粒径和多分散指数(PDI)逐渐增大,但都保持在100 nm以内;随着WPUS含量从2%增大到10%,涂膜的表面粗糙度增大、SiO2分布变得不均匀,拉伸强度、断裂伸长率都表现出先增大后减小的趋势,在WPUS含量为4%～6%时具有最佳的力学性能;加入WPUS后,复合膜的耐水性提高、透光率减小,但透光率都保持在90%以上,其中700 nm处透光率表现出先减小后增大的趋势。     

中海油400万t/a加氢裂化装置工艺特点及运行工况

介绍了国内首套引进Shell Global Solutions技术的400万t/a加氢裂化装置的工艺流程、技术特点和运行工况。该装置采用炉后混油流程、分馏系统汽提塔和稳定塔采用双再沸器设计、反应注水部分循环利用等新技术。100%设计负荷下的标定结果表明,在精制和裂化催化剂平均反应温度比设计值低约20℃的情况下,产品液体总收率为98.07%,中馏分油收率为56.30%,气体收率为4.55%,化学氢耗为2.70%,装置能耗为26.050 3 kg/t(以标准油计)。     

兴隆庄采煤塌陷蓄水区水环境现状分析与评价

为掌握兴隆庄采煤塌陷蓄水区水环境现状,对该地区六个塌陷蓄水区进行采样,并分别进行理化指标和重金属元素的检测分析,运用模糊综合评判法对水质进行评价。结果表明,塌陷蓄水区3-1水质最好,为Ⅲ类水,其他塌陷蓄水区均受到不同程度污染,均为Ⅴ类水。与国家地表水质量标准相比,6个塌陷蓄水区F-均超标,重金属元素除镉外,其他所测重金属未对塌陷蓄水区造成污染。     

电信客户社交网络分析方法与营销应用探讨

社交网络成为推动移动互联网迅猛发展的生力军,人与人的交往数据越来越集中,随着数据条件的成熟,社交网络分析迅速成为一个新兴的跨学科的专业研究方向。电信网络原本就是一个巨大的社交网络,电信企业如何才能让社交网络分析成为企业认识刻画客户的利器,并用之于客户关系管理和市场营销决策管理支撑呢?本文首先在对社交网络分析的概念界定、方法及发展趋势作简单介绍的基础上,探讨研究电信客户社交网络分析模型的意义;然后在界定社交网络分析的目标和对象,区别社交网络分析与传统分析方法之不同的基础上,探讨基于通话详单记录,电信企业建立社交网络分析的模型方法;最后,对电信企业如何应用电信客户社交网络分析结果提出了两方面建议。