和谐社会中社区体育的现状及对策研究

和谐社区是和谐社会的细胞,社区体育是社区之中的一种体育现象.本文简单介绍了和谐社会的特点,分析了制约我国和谐社会中社区体育发展的6大因素,针对这些因素,提出了我国和谐社会中发展社区体育的对策:(1)更新观念;(2)构建和谐社会的社区体育组织体系;(3)充分利用地理环境;(4)转变生活方式;(5)充分利用和培养社会各界体育人才;(6)多元化、多渠道地筹集社区体育经费.     

聚酯废料的再生利用

综述了用聚酯废料制备增塑剂、不饱和聚酯、粘合剂、涂料等，所得产品的性能及制备方法，提供了一些适合国情的废料综合利用途径。     

Hydrolysis-resistant Polyethylene Terephthalate （PET） Fiber

For certain industrial applications, the mechanical properties of PET fiber can be deteriorated from hydrolysis because the terminal carboxylic groups promote the degradation of macromolecules under high moisture and high temperature. It limits the wide applications of PET fiber in some special cases. In this paper, three additives are selected to improve the hydrolytic stability through the reaction of bi-functional groups on additive molecules with carboxyl groups on PET molecules. The additives can serve not only as hydrolysis stabilizers, but also as agents to increase the molecular weight and consequently to improve PET fiber mechanical properties. PET pellets were blended with additive before spinning, and melt spun into fiber. The fibers were then hydrolyzed in an autoclave by saturated vapor at 140℃ for a period of time. Measurements of intrinsic viscosity, terminal carboxylic group value and strength of polyester fibers were carried out to study the effects of hydrolysis resistance. Results show that 2, 2＇-bis （2-oxazoline） has best hydrolysis-resistibility and the chainextension effect at the same time.     

新型PET超韧性工程塑料的制备

此项工作集中于基于回收PFT瓶的高韧性工程塑料的研究。简要介绍了该聚合物合金的加工过程，其主要工艺是通过低温固相挤出和反应挤出制备。借助扩链剂与PET的反应，形成该材料的三维网络结构，同时保留吹瓶加工时的有序结构。研究了该聚合物合金材料的增韧机理，并分析其性能与结构的关系。     

The Relationship between Polarographic Reduction Potentials and Discharge Properties of Disperse Dyes

The half-wave potentials of disperse dyes with different structures are measured, the relationship between half-wave potentials and their discharge properties is discussed, then their effect factors are studied, such as the chemical structure types and substituents of disperse dyes and technological parameters. The results indicate that the halfwave potentials of disperse dyes when reduced could be used to characterize their reducing and discharge properties.     

Biodegradation of DTP and PET Fiber by Microbe

The degradation of diethylene glycol terephthalate (DTP) and polyethylene terephthalate (PET) fiber by microbe was studied. The degree of DTP degradation was determined by High Performance Liquid Chromatography (HPLC) to be more than 90%. The products after degradation of DTP and PET fiber were various. The degradation of DTP can be described by the first-order reaction model. The degradation of PET fiber was found to be little, but surface erosion of PET fiber could be clearly seen from the SEM photographs indicating there occurred some traces of biodegradation on the PET fiber surface.     

STUDY OF THE MECHANISM OF PET CREPE TEXTURING AND PROPERTIES OF ITS FABRIC

PET crepe for making silk-like fabric can be obtained by high-twist and heat setting. Recently, new technology, that is hight-twist, heat setting and false-twist has been applied abroad. This paper selects two kinds of technology for making crepe, weaving and finishing, then craping effect, lustre feeling, shape feeling, and mechanical properties have been measured and compared for three kinds of crepe fabric(including silk fabric). The results show that the fabric made of PET stretch crepe possesses light soft, better craping effect and bulkness, the machincal properties are close to those of silk crepe.     

PET(POY)加工ATY缝纫线的研究——强度和热收缩率

选用PET(POY)长丝通过空气变形加工缝纫线,为了提高缝纫线的强力和降低其热收缩率,对拉伸倍数、空气变形超喂率、热定型区温度和超喂率以及稳定区拉伸倍数进行了系统的实验,并分析了以上工艺参数对缝纫线的强力和热收缩率的影响.     

数字几何体模仿真呼吸运动

仿真在补偿呼吸运动的PET/CT成像研究中起着非常重要的作用。许多方法被开发出来用于仿真呼吸运动。然而,它们在使用中存在一些局限性,例如操作者的干预,花费太高或者是仿真时间太长等。提出一种新的简单方法,用GATE软件包来实现呼吸运动的仿真。GATE不仅在SPECT/PET仿真,而且在不同的模型仿真构建方面也提供了非常强大的功能。根据呼吸运动,在GATE的配置中就可以确定体模运动的特征。GATE可以生成象柱,球和椭圆等形状的几何体模。组合体模的运动特征和形状就可以仿真呼吸运动。仿真的结果表明,在开发和评估SPECT/PET补偿呼吸运动技术时,GATE产生的运动体模,提供了一种可选的方法用于呼吸运动的仿真。这种方法与传统方法相比,运算量小,体模设置简单。

Abstract：

Simulation plays very important role in the research of compensation respiratory motion in PET/CT imaging. Many approaches were developed to simulate respiratory motion. However,they have some limitations on operator intervention,much cost or time consuming in study. A new simple approach for respiratory motion simulation was proposed by using GATE （Geant4 Application Tomography Emission） software packages. GATE provides very strong functions to simulate not only SPECT/PET,but also different phantom construction. Phantom motion characteristics can be determined in GATE configuration in terms of respiratory motion. Geometric phantom were generated by GATE including the shape of cylinder,sphere and ellipse. Combination of the characteristics of phantom motion and shape may simulate respiratory motion. The simulation results demonstrate that the phantom generated by GATE may provide as one alternative useful method of simulating respiratory motion for the development and the assessment of respiratory motion compensation in SPECT/PET imaging. This approach has the features of less computational simulation and phantom setting up simply comparing with conventional phantoms.     

前躯体原位聚合溶胶-凝胶过程制备聚酯/纳米TiO_2杂化材料的可行性研究

设计并验证了一种特殊的原位溶胶凝胶过程,即前躯体原位聚合溶胶-凝胶过程的可行性.研究表明,由钛酸正丁酯(TBOT)带入的丁醇(BA)在酯化时被馏出反应体系外,TBOT的引入也不影响酯化反应程度.颗粒状的纳米TiO2在酯化反应阶段即已生成,其平均粒径约70nm,基本呈单分散态,在聚对苯二甲酸乙二醇酯(PET)基体中分散较均匀,这与纳米TiO2在PET基体合成过程中原位部分有机化密切相关.原位引入的纳米TiO2不影响PET树脂基体的热降解性能和相对分子质量分布.结果表明,通过前躯体原位聚合溶胶凝胶过程,在PET的合成体系中引入前驱体TBOT,通过这一方法制备可成型加工的PET/纳米TiO2复合树脂是可行的.