Thermal cross-linking and anti-meltdrop properties of copolyester containing phosphorus/magnesium salt composites by in situ polymerization

Polyester is widely used in household products because of its good mechanical properties and wears resistance, but polyester is easy to ignite and inclined to produce droplet, so its application range is limited. The cross-linkable magnesium hydroxide nanoparticles were incorporated into flame-retardant polyester, which enables the phosphorus-containing copolyester with thermal cross-linking and anti-meltdrop properties. The nanoparticles were achieved by in situ polymerization and acted as a nucleating agent for improving the crystalline properties of the copolyester. Furthermore, the nanoparticles also enhanced anti-meltdrop properties and reduced the heat and gas release during the combustion process of the copolyester. The maximum heat release rate and total smoke release reduced by 39.8% and 74.4% compared with pure polyester. Specifically, the combustion products of the nanoparticles and phosphorus flame retardant could act a barrier role by covering the carbon layer to isolate air and heat, thereby resulting in excellent anti-meltdrop properties. The simple modification method reported here realizes the collaborative modification of flame retardant and anti-meltdrop properties of phosphorous flame-retardant copolyesters by thermal cross-linking.     

高尺寸精度热轧特厚壁方管的生产技术

中低层建筑的钢结构需要大量的方管。介绍了采用热轧定径机将圆管轧制成方管的生产工艺流程,轧制条件对方管尺寸精度的影响,以及方管热轧成型技术与电阻焊冷成型法、铸造法的对比情况。同时介绍了采用该工艺开发的高尺寸精度热轧特厚壁方管的特点。所开发的热轧特厚壁方管除壁厚增厚外情况,其角部尺寸和边部平直度均达到甚至超过电阻焊冷成型方管的水平。     

球壳状纳米介孔腔内药物释放特性的分子动力学研究

有序纳米介孔材料的有序性、大的比表面积、孔道均匀等特性使其在药物装载、吸附、释放等方面得到广泛的应用。近年来研究者对介孔材料在药物控释方面的研究主要是通过材料制备、表征以及吸附药物后介孔材料的性能测试等几方面实现的。大多数报道都是采用实验的方法进行研究,关于模拟计算方面的研究很少,力场的选择更是模拟计算的一项挑战。依据介孔材料的独特结构构建了球壳状纳米介孔腔内药物分子释放模型,通过分子动力学的方法计算分析了药物分子的释放特性,重点考察了药物分子大小、溶液环境、介孔腔结构特征对其释放特性的影响。     

面向JAVA手机的有声E书流播放系统的设计

设计了一个有声e书的在线流式播放系统,对系统中使用的关键技术进行了阐述,实现了基于J2ME和MMAPI的播放终端,并使用WTK2．5对应用程序的运行结果进行了模拟,基本实现了语音媒体的流式播放,效果良好。     

电动汽车电池均衡技术综述

动力电池有限的使用寿命和续航能力已成为限制电动汽车普及的瓶颈因素,实现对动力电池快速、高效、均衡充电成为电动汽车中急需解决的一项关键技术.介绍动力电池不一致性及其危害,并分类剖析了几种典型的均衡电路的工作原理,最后对均衡控制系统实现产业化需要考虑的因素进行分析.     

QJGB型起爆具的研制

研究了一种特殊装药结构的起爆具,该起爆具以TNT45／RDX55熔铸梯黑炸药为起爆药芯,以纯TNT熔铸炸药为主装药,同传统起爆具相比,高能、敏感组分RDX含量大幅度降低,不仅大幅降低了产品材料成本,也由于RDX的减少而提高了起爆具生产、使用的安全性,产品爆速在7000m／s以上,符合WJ9045--2004I型工业起爆具要求,具有良好的经济、社会效益。     

T2D750/22双摇臂抱杆的研制及应用

针对舟山与大陆联网大跨越工程2基370 m高塔的组立施工特点,研制了T2D750/22双摇臂抱杆.该抱杆具有以下几个创新技术及其特点,包括海岛高空抗强台风计算、起升绕绳系统、起升和变幅钢丝绳防干扰装置、双侧力矩控制系统、摇臂防撞装置、井筒吊装系统和SC60变频施工升降机等.     

作战工程保障行动中的一种战士-装备-任务指派模型及其求解

围绕作战工程保障行动中战士、装备和任务的指派问题,构建了一个包括战士操作水平、装备技术状态和协作影响因素的三维指派模型。考虑战士多技能、装备多功能的战备要求和“人歇车不歇”作战原则,给出了该模型的约束条件。基于目标函数和约束条件的形式,采用虚拟装备法将多功能装备分解为单功能装备的组合,并在此基础上设计了一套快速求解算法。实例分析结果表明：该指派模型能够实现作战工程保障行动中最优指派方案的求解;同时快速求解算法可以极大地缩小可行域,从而显著提高求解效率。     

Experimental and numerical investigation of the effect of the urban heat island on slope stability

The Urban Heat Island effect on slope stability was investigated using experiments, field observation and numerical simulation. A series of laboratory tests shows that the shear strength of Xiashu clay soil (Nanjing, China) is influenced by temperature, water content and density. The numerical model indicated the average temperatures of the potential failure zone in the modeled slopes increased by about 3.8 °C during a 90 day period from 13th June; the average difference between the urban and rural environments was 2.46 °C. The temperature fields were combined with the cohesion–temperature relationship to calculate the safety factor of the modeled slopes using the Sweden Slice Method. The results indicate that the safety factor of the slopes reduces during the hot summer weather, with the effect most pronounced in the urban environment. The conclusion from this preliminary study is that the Urban Heat Island has a negative effect on the slope stability in this region.     

自噬在肾间质纤维化小鼠中的表达趋势

目的: 观察肾间质纤维化单侧输尿管梗阻模型（UUO）术后不同时间点自噬的表达趋势。方法: 32只清洁级健康雄性ICR小鼠随机分组：假手术（Sham）组、UUO模型（UUO）组,分别在 UUO术后 3、7、14 d 处死小鼠,假手术组7 d处死,每组小鼠8只。留取血清检测血肌酐（Scr）、尿素氮（BUN）,肾组织行HE和Masson染色,观察光镜病理结果,电镜超微结构观察自噬体的形成,Westernblot检测肾组织LC3蛋白和P62蛋白的表达。结果: UUO术后梗阻侧肾脏皮质变薄,小管萎缩,间质纤维化,单个核细胞浸润,肾小球无明显病变,病理变化以UUO术后14 d最突出。与Sham组相比,LC3-Ⅱ蛋白含量从3 d开始逐渐增高,7 d时达峰值,14 d时下降;而P62与LC3-Ⅱ相反,3 d开始下降,7 d达最低值,14 d又逐渐恢复,表明自噬在7 d这个时间点表达最显著。电镜显示UUO术后7 d出现自噬小体和吞噬泡现象。结论: UUO术后自噬的表达有一定的时间依赖性,在7 d时表达最显著,自噬与病理严重程度不平行。