The intumescent flame‐retardant biocomposites of poly(lactic acid) containing surface‐coated ammonium polyphosphate and distiller's dried grains with solubles (DDGS)

This work aims to develop the poly(lactic acid) (PLA) biocomposites with high flame‐retardant performance, which can be applied in electronic and electrical devices as well as automotive parts. First, an intumescent flame retardant composed of ammonium polyphosphate (APP) as the acid source and the blowing agent, and the distiller's dried grains with solubles (DDGS) as the natural charring agent was designed. The surfaces of DDGS and APP were coated by degradable polymeric flame‐retardant resorcinol di(phenyl phosphate) (RDP), and the coating effects were analyzed. And then the flame‐retardant biocomposites of PLA with RDP‐coated DDGS (C‐DDGS) and RDP‐coated APP (C‐APP) were prepared. The limited oxygen index value of the biocomposites with loading of 15 wt% C‐DDGS and 15 wt% C‐APP reached 32.0%, and UL‐94 V‐0 was attained. The biocomposites also had good mechanical properties and the tensile strength of this sample reached about 57 MPa. Finally, the char residues after burning were analyzed and the flame‐retardant mechanism was discussed.     

5G网络中APP感知评估验证研究

5G SA网络规模不断壮大,5G用户主要使用终端APP进行各类业务交互,通过对不同网络环境下的APP应用感知进行验证和研究,量化APP感知体验,聚焦用户真实使用感知,发现网络风险,优化网络感知,提升用户网络使用满意度。     

滤镜特征的归类分析与大众美图再设计赋能研究

滤镜在图形图像后期处理软件和美图APP中,是个不可或缺又极具生命力的存在。在滤镜被大众误认为能囊括一切修图功能的乱象中,本文从梳理滤镜发展脉络,厘清其与特效、美颜的关系入手,以总结其特征与归类为目的,通过分析美图APP中大众参与再设计的过程与方法,得出滤镜是开启大众美图再设计之门的有效切入口的结论。     

湖南省体育运动游泳馆屋面渗漏维修技术

湖南省体育运动游泳馆瓦屋面年久失修渗漏,经对其弧形屋面换铺蓝色石棉瓦、平屋面改铺绿砂面APP改性沥青防水卷材,并对平屋面排水系统及构造的细部节点作出处理后,根治了该馆屋面的渗漏。     

缩合剂对聚磷酸铵聚合度影响的研究

以尿素和磷酸一铵为原料,研究了三聚氰胺、五氧化二磷、尿素、硫酸铵、双氰胺等几种缩合剂对聚磷酸铵(APP)聚合度的影响。结果表明,这几种缩合剂对提高聚磷酸铵的聚合度均有一定的效果,其中五氧化二磷和尿素对聚磷酸铵的聚合效果较佳,可制得聚合度大于300或接近400的APP产品。     

Flame retardant,mechanical, and hot air aging properties of ethylene-propylene-diene monomer/ammonium polyphosphate/nano-silic composite rubber

In this work, effect of the ratio of nonhalogenated flame retardants (ammonium polyphosphate [APP] and nano-silica [nano-SiO₂]) on the mechanical, thermal, and flame retardant properties of ethylene-propylene-diene monomer (EPDM) composite rubber were investigated. Vulcanization characteristics, high temperature compression permanent deformation, thermal oxygen aging, dynamic thermodynamic analysis, thermal stability, cone calorimetry, limiting oxygen index (LOI), horizontal vertical combustion (UL-94), and scanning electron microscopy were carried out. The experimental results showed that the mechanical properties of the composite rubber decreased with the addition of APP. However, the addition of nano-SiO₂ was found to significantly improve the mechanical properties of the composite rubber when it was incorporated. In terms of flame retardant properties of EPDM composite rubber, the combination of APP and nano-SiO₂ has a synergistic flame retardant effect in comparison to the use of single APP flame retardant. The heat release rate of EPDM composite rubber decreased by 34%, the total heat release decreased by 19%, the LOI increased by 76%, and the flame retardant grade of EPDM composite rubber reached V-0. The EPDM composite rubber fabricated in the present study showed excellent fire resistance and desirable mechanical properties, which are of practical significance for further expanding the application ranges of EPDM rubbers.     

Android掌上实验室客户端系统设计与实现

AR技术、VR技术以及Android 智能终端的迅速发展，为教学实验改革带来了新的机遇。本文利用虚拟现实技术，结合安卓应用开发，探讨如何设计并实现基于Android 平台的掌上实验室APP，让高校学生用户群体可以便捷地进行虚拟实验，减少实验成本,提高学习效率。     

Statin Therapy and the Development of Cerebral Amyloid Angiopathy—A Rodent in Vivo Approach

Background: Cerebral amyloid angiopathy (CAA) is characterized by vascular deposition of amyloid β (Aβ) with a higher incidence of cerebral microbleeds (cMBs) and spontaneous hemorrhage. Since statins are known for their benefit in vascular disease we tested for the effect on CAA. Methods: APP23-transgenic mice received atorvastatin-supplemented food starting at the age of eight months (n = 13), 12 months (n = 7), and 16 months (n = 6), respectively. Controls (n = 16) received standard food only. At 24 months of age cMBs were determined with T2*-weighted 9.4T magnetic resonance imaging and graded by size. Results: Control mice displayed an average of 35 ± 18.5 cMBs (mean ± standard deviation), compared to 29.3 ± 9.8 in mice with eight months (p = 0.49), 24.9 ± 21.3 with 12 months (p = 0.26), and 27.8 ± 15.4 with 16 months of atorvastatin treatment (p = 0.27). In combined analysis treated mice showed lower absolute numbers (27.4 ± 15.6, p = 0.16) compared to controls and also after adjustment for cMB size (p = 0.13). Conclusion: Despite to a non-significant trend towards fewer cMBs our results failed to provide evidence for beneficial effects of long-term atorvastatin treatment in the APP23-transgenic mouse model of CAA. A higher risk for bleeding complications was not observed.     

建设母婴品牌APP的意义及设计运营策略

众多世界母婴品牌巨头面对移动互联网大潮纷纷推出企业品牌APP,移动APP能更快且较低成本与其目标消费者年轻一代父母沟通,以及移动设备软硬件的成熟和APP用户体验的大幅提升成为其流行的原因。常见的母婴品牌APP分为工具型和娱乐型。工具型因其有众多的实用功能,数量较多;娱乐型多为教育APP和游戏,用于培养用户长久的品牌偏好。对于APP的开发,企业可分情况自建开发团队或者外包开发任务或者定制产品进行冠名。母婴品牌APP的推广和运营是继设计开发后更难更重要的工作。本文中论述了二维码、微博营销等在实践中有效的推广途径,以及虚实结合、挖掘数据和持续更新等运营策略。     

基于层次分析法的高校餐饮外卖APP评价研究

随着互联网的快速发展,网络已经成为现代人日常生活中不可或缺的部分。网上订餐由于其独有的便捷性,更能够轻而易举地被现代人接受。互联网上诞生的便捷订餐形式,也是电子商务应用的全新体现;从侧面来看,网上订餐也在帮助加速电子商务的应用。在高校,餐饮外卖APP的应用越来越普遍,对在校学生餐饮外卖APP的选取评价具有实际意义。文章构建了外卖APP的评价指标体系,应用层次分析法对目前市场中份额占比多的3家餐饮外卖APP—饿了么、美团外卖、百度外卖进行评价。