含磷环氧树脂体系的研制及性能研究

通过含磷环氧树脂固化剂与环氧树脂的反应,制备了含磷环氧树脂体系,对含磷体系的玻璃化转变温度、在不同温度下的适用期以及阻燃性能进行了表征,并与相应的不含磷的体系进行了对比。结果表明:含磷体系在室温下的适用期延长,玻璃化转变温度和阻燃性能提高,但是初始分解温度降低。     

NMR法研究羧甲基羟丙基纤维素的取代结构

羧甲基羟两基纤维素(CMHPC)经水解和乙酰化反应后,利用~1H NMR和~(13)C NMR谱确定其取代度和取代基分布,提出了纤维素葡萄糖单元上羟基的相对反应活性顺序。     

Improving operation lifetime of OLED by using thermally activated delayed fluorescence as host

We fabricated organic light-emitting diodes (OLEDs) with the thermally activated delayed fluorescence (TADF) material of 4CzIPN, which show better stability compared with the 4,4’-Bis(carbazol-9-yl)biphenyl (CBP) based devices. The half lifetime of the device using 4CzIPN as host material has doubled, and a slower voltage rise compared with that of CBP-based devices has been achieved, which indicates the improvement of stability. We attribute the better stability to the good film morphology and difficult crystallization property of 4CzIPN. Our results suggest that employing the 4CzIPN as host material can be a promising way of fabricating OLEDs with longer operation lifetime.     

WSN中基于虚拟网格的LEACH改进算法

针对传统分簇算法(LEACH)在选取簇头时,网络能耗消耗过快的问题,提出一种改进的分簇算法(U-LEACH)。该算法在簇头选取阶段,新增节点与传感器网络重心的距离和节点的剩余能量两个影响因子,优化LEACH算法中簇头节点的选取函数,保证簇头选取的合理性。仿真结果表明,改进的U-LEACH算法相比于原算法减少了网络的能量消耗,延长了网络生命周期。     

Co-doping method used to improve the charge transport balance in solution processed OLEDs

In this paper, co-doping method is used to improve the current efficiency of solution-processed organic light-emitting diodes (OLEDs). By changing the ratio of two thermally activated delayed fluorescent (TADF) emitters, we studied the performance of device and its mechanism. A solution processed OLED with a structure of indium tin oxide (ITO, 150 nm)/PEDOT:PSS (30 nm)/CBP:4CzIPN-x%:4CzPN-y% (30 nm)/TPBi (40 nm)/LiF (1 nm)/Al (100 nm) was fabricated. The current efficiencies of 26.6 cd/A and 26.4 cd/A were achieved by the devices with dopant ratio of 6% 4CzIPN:2% 4CzPN and 2% 4CzIPN:6% 4CzPN in emitting material layer (EML), respectively. By investigating the tendency of current density change in devices with different doping ratio, we suggested that the enhancement of the current efficiency should be due to the charge transport balance improvement induced by assist dopant in EML.     

700MW机组SCR脱硝系统性能考核试验若干关键问题探讨

介绍了某电厂700 MW机组现场选择性催化还原(selective catalytic reduction,SCR)脱硝系统考核试验,包括烟气温度分布测量、烟气流量测量、系统压损测量、烟气NOx、O2测量及脱硝效率计算、氨逃逸率(体积分数)测量、SO2/SO3转化率测量、氨耗量计算等,所得结果表明SCR脱硝系统满足SCR性能保证值要求,但是,现场性能试验还说明SCR脱硝系统还存在问题,需进一步解决并提出解决措施。     

并行计算有限元法与工程应用

有限元法是解决复杂工程计算问题的重要数值方法,传统的有限元计算采用串行计算体系,限制了它的运算能力。采用并行计算的方法,不仅可以提高有限元数值运算的效率,还能扩大有限元方法的适用范围。     

甲醚化三聚氰胺甲醛树脂的合成与表征

以四羟甲基三聚氰胺、甲醇为原料,单因素法优化甲醚化三聚氰胺甲醛树脂合成条件,并对树脂结构进行了~1H-NMR、FT-IR、GPC分析表征。结果表明,树脂制备较优工艺如下:四羟甲基三聚氰胺与甲醇物质的量比为1.0∶6.5,醚化温度45℃,pH 4.0,醚化保温时间50~60 min,醚化后70℃下减压蒸馏45 min脱醇脱水,得到的树脂游离甲醛质量分数≤0.5%,粘度4 000~6 000 m Pa·s,pH 8.50~9.50时,贮存时间180 d,树脂水溶性好。树脂含羟甲基、亚氨基、甲氧基等特征官能团,平均分子质量380左右。     

专注玻璃纤维创新 持续打造产品的特色化、中高端化

四川省玻纤集团有限公司(原四川省玻璃纤维厂,以下简称"四川玻纤集团"),是1968年从上海内迁到德阳的三线企业,是西南地区玻璃纤维产业集群的奠基者、发展者、带动者,是中国电工绝缘和电子玻纤材料的重要生产基地,是国内外享有盛誉的专业生产玻璃纤维的骨干企业,是国家高新技术企业,是四川省企业技术中心,四川省"守合同重信用"企业,也是银行信用AAA级和ISO9001(2008版)质     

应用最重要 三款热门游戏全体验

在这里，没有枯燥的游戏分数，没有羞涩难懂的BenchMark得分，有的只是不一样的游戏体验。没错，今天我们不谈分数，只谈体验。我们的目标只有一个：找到能够征服当下最火热的三款游戏大作、且在三款大作中获得出众游戏体验的显卡，并将产品推荐给你——无论你是硬件玩家、游戏爱好者，还是普通购机者。