查询词典 pan

The gel dynamics experiments showed that the gel formation law was similar with the other polymer systems, which wasrelated with dense surface under the soft coagulating condition and the thickening gel; the square of gel thickness was linear with coagulation time. The qualitative analysis of the surface puckers of fibers spun from wet spinning and dry-jet wet spinning was made. The positions where the die swell appeared were not the same and the die swell appeared at the air gap where the fiber would markedly been elongated and vary little in the coagulant, thus the surface of fiber spun from dry-jet wet spinning was more smooth. The radial component concentration gradient was responsible for the radial structure of PAN fiber spun from dry-jet wet spinning. The thicker surface with microvoid structure of

对湿纺和干湿纺进行比较表层沟槽的产生进行定性分析，原因在于孔口胀大区域出现在不同位置，在干湿纺中，溶液的孔口胀大出现在空气层，并在该区完成大部分形变，进入凝固浴后形变很小，纤维表面较为光滑；干湿纺PAN纤维径向结构存在差异，这与丝条内组分由于双扩散进行导致径向上存在浓度差异直接相关；凝固强度较大的体系，可以获得厚度较大且孔结构尺寸较小的皮层；含较少缠结的PAN原液在纤维成形后截面很圆整，但原液缠结浓度增大时成形后圆整度下降；PAN纤维成形是一个远离平衡的过程，凝固作用缓和的体系可以使成形过程靠近平衡，可获得更大尺寸的孔洞结构；原液中少量的非溶剂添加剂显著改变纤维径向结构，可获得孔洞尺寸更小和更为均一的径向结构，这与径向浓度差异的减小、分相时间的集中相关；PAN原液的成形纤维表面依赖于凝固强度；由AFM对相近凝固条件下成形的PAN膜进下

FT-IR spectra shows that the polyaniline is present primarily in the emeraldine salt form, and the polymeric chains interact with inorganic framework, most likely via V=O…HN hydrogen bonding. XRD,TG and DSC indicate that the lamellar structure of the V_2O_5 is preserved, PAn chains eliminate water form the interlamellar region and are partially inserted between the layers, and exist with extended-chain conformation owing to the confined environment.Electrochemical investigation in the range of 1.8~3.8V vs.

红外光谱表明复合物中PAn主要以导电聚苯胺盐的形式存在，PAn链与V_2O_5晶格之间可能形成了V=O…HN氢键。X射线衍射、热重和差示扫描量热证实了PAn/V_2O_5复合物保持了较规整的层间排列结构，PAn取代了V_2O_5干凝胶中的层间水而部分嵌入其片层间，由于受空间的限制，PAn分子链以比较伸展的链构象存在。

The graft polymerization of acrylonitrile on Crosslinked polyvinyl alcohol microspheres CPVA microspheres was performed by using cerium ammonium sulfate as initiator, and grafted microspheres CPVA-g-PAN were prepared. Subsequently, the grafted PAN was converted into poly via amidoximation reaction with hydroxylamine hydrochloride as reagent, resulting in the functional microspheres CPVA-g-PAO. The chemical structure and physicochemistry characters were adequately characterized with infrared spectrum, scanning electron microscope and determining Zeta potential. The effects of main factors on the amidoximation transform reaction of the grafted PAN were researched with emphasis, and the adsorption property of the functional microspheres CPVA-g-PAO for some biomolecules was examined preliminarily with uric acid as a model biomolecule.

以硫酸铈铵为引发剂，实施了丙烯腈在交联聚乙烯醇微球表面的接枝聚合，制备了接枝微球CPVA-g-PAN，然后以盐酸羟胺为试剂，通过偕胺肟化转变，将接枝的PAN转变为聚偕胺肟，制得了接枝有聚偕胺肟的功能微球CPVA-g-PAO，采用红外光谱法、扫描电子显微镜及Zeta电位测定等法，对功能微球CPVA-g-PAO的化学结构及物理化学特性进行了表征，重点考察了各主要因素对接枝PAN的偕胺肟化转变反应的影响，也以脲酸为模型分子，初探了功能微球CPVA-g-PAO对生物分子的吸附性能。

At the same time, the fouling mechanism of membranes given in this thesis can give a reasonable explanation on the change of membrane performance. Our results show that the magnetization of membranes can effectively improve the anti-fouling ability of the PAN- Fe_3O_4 membrane. The obtained result may give insight to the development of new membranes with a good anti-fouling performance in the filtration of blood solution. No chemical bond was found between PAN and Fe_3O_4 in the membrane at room temperature. The addition of Fe_3O_4 can improve the temperatures of dehydrogenated reaction and decomposition of PAN but dot change the glassy transition temperature. The resistance against acid is stronger than the resistance to base for a PAN- Fe_3O_4 membrane.

结果表明在PAN- Fe_3O_4超滤膜制备过程中使用外加磁场作用能有效提高膜的耐污染能力，这一结果为开发适用于血液处理的耐污染超滤膜提供了一种新途径；在PAN- Fe_3O_4超滤膜中，四氧化三铁与PAN在室温下没有形成化学键，也不存在官能团之间的相互作用；添加Fe_3O_4对膜的玻璃化温度没有影响，但能提高PAN环化脱氢反应的温度和分解温度；PAN- Fe_3O_4超滤膜的耐酸性强于耐碱性，在pH值为10以上的溶液中由于水解作用而溶解，使得膜失去使用价值，膜的耐酸性与酸的种类、浓度和氧化性有关。

As for PAn-based composites, the influences of the kinds of oxidant, the amount of hydrochloric acid and barbon black on conductivity were investigated, Li/PAn button-type secondary batteries were assembled with PAn-based composites which were synthesized by chemical oxidative polymerization and used as cathode, the influences of the kinds of oxidant, synthesized technics, conducting carbon black added mode and PAn/metal oxide composites used as cathode on the properties of these batteries were studied.

对于聚苯胺基复合材料体系，研究了氧化剂种类、盐酸用量、炭黑用量对复合材料电导率的影响；以化学法制备的聚苯胺基复合材料作正极组装了Li/PAn二次扣式电池，探讨了氧化剂种类、聚合工艺、导电剂的加入方式以及PAn与金属氧化物复合后作电池正极的性能。

The main factors that can affect the strength of base PAN fiber and how its hydrolysis reaction happened in alkaline conditions were discussed.

应用红外光谱仪、元素分析仪、比表面分析仪等对基体聚丙烯腈纤维及其部分水解PAN-COOH型离子交换纤维进行了表征，讨论了影响基体PAN纤维强度的主要因素和碱性条件下的水解反应获得了干态水解PAN纤维的性能指标：强度8.3 cN/dtex，交换容量0.26 mmol/g ， BET比表面积为0.58平方公尺/g的PAN-COOH型离子交换纤维，并较为详细地讨论了该纤维氰基转化成羧基的比率，羧基在纤维表面的排列及最大水解量。

Pan out, like the verb pan itself, comes from the noun pan in the sense a shallow circular metal vessel used in washing gold from gravel.

Pan out 象动词 pan 本身一样来源于名词 pan ，意思是&一个浅而且圆的金属器皿，用来从矿砂中淘洗金子&。

Pan out,like the verb pan itself, comes from the noun pan in the sense 揳 shallow circular metal vessel used in washing gold from gravel.?

Pan out象动词 pan本身一样来源于名词 pan，意思是&一个浅而且圆的金属器皿，用来从矿砂中淘洗金子&。

Dynamic laser light-scattering experiment indicated that PEO-PAn and PAn-PEO-PAn aggregated in DMF, and their aggregation radiuses were about 40-60nm.

所合成的嵌段共聚物PAn-PEO，PAn-PEO-PAn通过动态激光散射测量表明：在选择性溶剂DMF中形成了胶束，它们的胶束半径在40-60nm之间。

Pan'world started in Scotland in 1899, the founder, the Colone Malcolm De Daphta family, was specialized in breeding and developing terriers. Now Pan'world has become the breeding center of all breeds in the UK and Europe. While developing the breeds, Pan'world has also developed a series of services and products such as luxlrious products which takes up 9% market share in European, pet food and chain stores.

orld在1899年起源于风景如画的苏格兰高地，其创始人Colone Malcolm De Daphta家族最初以培育及研发新品梗类犬为主，发展至今已经成为英国乃至全欧洲的全犬种繁育中心，Pan'sWorld在其发展的过程中，努力开拓宠物产业中的多项服务及产品，如：开发了以PANSWORLD为品牌的名贵宠物用品，占领了欧洲9%的市场份额，还有各种宠物食物及宠物连锁店等。2006年底Pan'sWorld来到中国，拥有了一个中国名字？？

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。