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| | In this paper, relations between the construction and coating bchaviours of water dispersion polyurethane anionic ionomer are investigated by the modern physical methods. Works done in this study are as follows: (1) Relations between the blend ratio of PU ionomer-HPAM two-phase blends and some properties such as vapour-permeability and Tg. (2) The effect of varied blocked construction on the mechanical and coating properties. (3) The Crosslinking reaction of coating process. (4) The effect of ionic group co... | | 本文研究了水分散聚氨酯阴离子体涂层剂的聚集状态与性能的关系,特别是对影响织物涂层的主要因素作了探讨。本文在下列几个方面作了研究:(1) PU(聚氨酯,Polyurethane)阴离子体与HPAM(水解聚丙烯酰胺,Hydrolyzed polyacrylamide)共混二相结构对玻璃化温度T_g及透湿量的影响;(2) PU大分子(AB)_n型结构对力学性能及涂层性能的影响;(3) 交链剂的交链行为;(4) 离子化度对贮存稳定性的影响。此外,在研究PU阴离子体涂层性能的控制因素方面提出了新的见解,即调节PU阴离子体中硬段含量可获得透湿性强且弹性好的涂层织物。 | | 文摘来源 | | Ultrahigh doped GaAs has considerable bandgap narrowing (BGN) effect, so that GaAs homo-BTs with ultrahigh doped base act as HBT and can be called as pseudo -HBT. In this paper,the BGN effect and its influence on the effective intrinsic carrier concentration of GaAs under ultrahigh doping were discussed based on the experimental results reported in literature,and the emitter injection efficiency and common-emitter de current gain of np+n GaAs p-HBT's were analysed theoretically.It was shown that the devices... | | 超高掺杂GaAs具有明显的禁带变窄(BGN)效应,因此采用超高掺杂基区的GaAs同质晶体管也可获得HBT的效果.故称之为赝HBT(p—HBT)。本文根据实验结果讨论了超高掺杂情况下GaAs的BGN效应及其对有效本征载流子浓度的影响,并对np~+n型结构GaAs p—HBT的发射极注入效率和共发射极电流增益进行了理论分析。结果表明,当基区掺杂浓度高于1×10~(20)/cm~3时可以获得较好的器件特性。 | | 文摘来源 | | n the course of reformins chinese currient trainins system,“N”style ctmnging would be one Inevitable and important stage. In the course, a new trainning system. which would pin country and club ownership factors. would be formed.That is“N”style structure system | | 在改革我国现行运动训练体制的过程中,N型转轨将是一个必然的重要阶段。在这一转轨过程中,将形成一个把占主导地位的国家所有制因素和俱乐部所有制因素结合起来的新型运动训练体制,即N型结构体制。 | | 文摘来源 | |   | | << 更多相关文摘 |
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