不同混纺比甲壳素/长绒棉混纺纱工艺与性能研究

应用东华大学自行研制的小型环锭纺纱整套系统纺出10/90、20/80、30/70、40/60、50/50等5种不同混纺比的19.5 tex甲壳素/棉混纺纱,阐明了各个工序的工艺参数,测定了混纺纱的断裂强度、断裂伸长率、条干CV值和毛羽,分析了混纺比对混纺纱性能的影响.结果表明,10/90甲/棉混纺纱的强伸度最好;20/...     

液蜡的手工调和及自动调和浅析

论述了石油三厂分子筛脱蜡装置生产的液蜡产品的手工调和方法及利用微处理机进行自动调和的可行性。     

面泊松融合结合色彩变换的无缝纹理辐射处理

目的：消除三维模型纹理接缝上的辐射差异,实现接缝处色彩的自然、连续的过渡。方法：本文在标准的泊松融合（Poisson Blending）基础上,结合色彩变换技术（Color Transfer）,提出了一种新的以面为基元的泊松融合无缝纹理辐射处理方法。首先以影像上的纹理三角形为处理单元,以色彩变换参数为未知数,根据模型的三角网边邻接拓扑关系建立泊松方程组,然后全局最小二乘解求局部色彩变换参数,最后进行全局最优解下的局部色彩变换。结果：既保证了色彩的均匀过渡,又能更好的改正影像间的整体色差。结论：相比使用标准的像素级泊松融合方法进行无缝纹理处理,本文的方法拥有计算上的优势,更适合于复杂模型的处理,且有更好的整体色差改正与过渡效果。理论分析和大量试验证明了本文方法的优越性。     

Reactive blending of polyamide with polyethylene: pull-out of in situ-formed graft copolymers and its application for high-temperature materials

Reactive blending of polyamide 6 (PA) with polyethylene (PE) having reactive sites, maleic anhydride (MAH content=0.1 wt%),and glycidyl methacrylate (GMA content=3-12 wt%), was carried out at 70/30 and 65/35 (PA/PE) blend ratios. Blend morphology evolved by reactive blending was analyzed by light scattering and transmission electron microscopy. The blends were then irradiated by electron beam. The degree of crosslinking was estimated by measuring the dynamic storage modulus at a temperature above melting point of PA. It was found that surface-to-surface interparticle distance τ was significantly reduced by the micelle formation via pull-out of in situ-formed graft copolymers. The blend with shorter τ was crosslinked by electron-beam irradiation at the lower dose level. A blend having the minimum τ (∼0.2 μm) was nicely crosslinked at a low dose level same as for PE, and even for the PA matrix system.     

Rheological behavior of reactive blending of epoxidized natural rubber with cassava starch and epoxidized natural rubber with natural rubber and cassava starch

Epoxidized natural rubbers (ENR‐25 and ENR‐45) were prepared using the performic epoxidation method. Two‐component (ENR–cassava starch) and three‐component (ENR–NR–cassava starch) blends were prepared. ENR‐25 and ENR‐45 were blended with various quantities of gelatinized cassava starch in the latex state. The pure ENR exhibited lower shear stress and shear viscosity than those of the blends with cassava starch. Furthermore, the shear stress and shear viscosity were increased with an increase in the cassava starch concentration. The chemical interaction between the epoxide groups in the ENR and the hydroxyl groups in the cassava starch molecules might be the reason for the increasing trends of the shear stress and shear viscosity. The blends are classified as compatible blends because of the strong chemical bonding between different phases. SEM micrographs were used to clarify the compatibility. Power law behavior with pluglike flow profiles was observed for all sets of ENR–NR–cassava starch blends. Very low power law index values (<0.34) and highly pseudoplastic fluid behavior were also observed. The log additive rule was applied to plots of zero shear viscosity (consistency index) and the shear viscosity versus the concentration of ENR‐25. Positive deviation blending was observed, which indicates compatible blends. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1752–1762, 2004     

配贫瘦煤炼焦的探讨与实践

介绍了在生产性实验中配加不同比例的贫瘦煤炼焦对焦炭强度的影响 ,最经济合理的配煤比可使焦炭的强度有一定改善。     

LLDPE／LDPE共混物熔体挤出胀大行为的研究

应用毛细管流变仪，考察了实验条件下线性低密度聚乙烯与低密度聚乙烯共混物（ＬＬＤＰＥ／ＬＤＰＥ）熔体挤出胀大行为及其影响因素。结果表明，挤出胀大比Ｂ与剪切应力近似呈幂律关系，而随口型长径比的增加呈指数衰减，当共混比为５０／５０时，Ｂ产生局部极涉值现象。     

600MW双环式密封油发电机氢气纯度快速下降原因分析及处理

针对某厂三期2×600MW国产发电机组存在耗氢量大的问题进行研究。通过试验和分析,发现该类型机组的双环式密封油系统存在空侧密封油和氢侧密封油串油。溶解在密封油中的空气析出影响了发电机内氢气纯度,使得补排氢频繁,氢气耗量大。采用了降低密封油温度的方法,减缓了发电机内氢气纯度下降速度,有效地解决了耗氢量大的问题。     

并列短语及其词序的认知语言学研究

有关并列短语及其词序的研究目前主要存在四方面的问题：“并列短语”的概念之争、并列短语的界定、并列短语与并列复合词的异同、并列短语的词序。为解决这些问题与分歧,认知语言学的基本观点、假设、范畴的原型观、语言的象似观、概念整合理论以及词汇化和短语固化等理论和观点构成研究并列短语及其词序的理论基础,该理论能在一定程度上对以上问题作出合理的解释。根据范畴的原型观,并列短语具有典型性,为并列短语及其词序研究尤其是定量研究提供了理论基础;象似性在并列短语中大量存在,尤其是顺序象似或时间顺序原则,在汉语中尤为明显;词语整合具有层级性,并列短语在词汇化和固化程度上的不同,与概念的整合层级性相关。     

地源热泵钻孔布置形式对土壤温度场的模拟研究

本文采用数值模拟的方法,通过模拟土壤源热泵井群不同的布置方式,比较相同孔间距时钻孔叉排和顺排布置时的区域热效率,得到在面积一定的条件下,相同的孔间距时,叉排布置更有利的结论.