Surface modification of poly-(<Emphasis Type="Italic">p</Emphasis>-phenylene terephthalamide) pulp with a silane containing isocyanate group for silicone composites reinforcement

A silane containing isocynate groups (3-(trimethoxysilyl) propyl cyanic acid ester, NCO) associated with hexamethyldisilazane (HDMS) is used to modify the surface of poly-(p-phenylene terephthalamide) (PPTA) pulps. As concerns surface chemistry, Attenuated Total Reflection Flourier Transformed Infrared Spectroscopy (ATR FT-IR) and X-ray photoelectron spectroscopy (XPS) confirm that NCO associated with HDMS silylated PPTA pulp surface successfully. While the modified PPTA pulps are used as reinforcing fillers for silicone composites, the dispersibility and storage stability of the composites are improved as Mooney testing indicated. The silicone composites filled with modified PPTA pulps present a higher tensile strength and much higher broken elongation (3.30 MPa and 166.54%) than that with unmodified pulps (3.08 MPa and 68.47%), respectively.     

红外热波技术在涡轮叶片涂层检测上的应用

涡轮叶片作为燃气轮机的重要部件,长期在高温、高压、高速旋转的环境中工作,其热障涂层极易损坏。热障涂层损坏会极大地影响涡轮叶片的使用寿命。红外热波检测技术不同于传统的红外检测方法,它通过主动控制激励热源来对涡轮叶片进行加热,然后利用红外热像仪摄取具有热障涂层脱落情况叶片的红外图像,并使用伪彩色增强技术和边缘检测技术增强对红外图像中热障涂层缺陷的分辨能力。实验结果表明,该检测技术可以快速准确地检测出热障涂层脱落部分的位置及大小。     

积液型两相流分配器的性能与优化

摘要： 试验研究了带有复杂入口管的积液型两相流分液器在不同干度和质量流量条件下的分液均匀性.结果表明：当干度增大时,分液器的分液均匀性下降;当质量流量增大时,分液器的分液均匀性得到改善;各工况下分液器分液的流体质量流量标准偏差（STD）的平均值为2.80%.同时,对复杂入口管进行了计算流体动力学模拟,提出了一种能够有效降低入口管形式影响的新型双筒体型分液器,并通过试验加以验证.验证试验结果表明,在各工况下,双筒体型分液器分液的STD的平均值为2.36%,比积液型分液器的分液均匀性提高了15.7%.     

基于小白鼠实验的新型膨胀阻燃低密度聚乙烯复合材料烟气毒性研究（英文）

利用小白鼠试验来研究新型阻燃低密度聚乙烯(LDPE)复合材料的烟气毒性,探寻材料烟气毒性最大不至死浓度,根据相关标准判断材料毒性所属级别,并比较研究不同燃烧状况下阻燃LDPE复合材料产烟毒性.从烟气毒性实验可知,有焰燃烧比无焰燃烧具有较小的烟气毒性.同时利用火灾性能指数和火灾发展指数对阻燃LDPE复合材料的火灾安全性进行评价.研究结果有助于优化设计环境友好、综合性能优良的阻燃低密度聚乙烯复合材料.     

货油舱用耐蚀钢连续冷却的转变规律

在MMS-300热模拟试验机上测得货油舱用耐蚀钢在不同冷速下的连续冷却膨胀曲线,结合金相-硬度法,研究了该耐蚀钢变形和未变形过冷奥氏体冷却过程中的组织演变,建立了连续冷却转变(CCT)曲线.结果表明,动态CCT曲线较静态CCT曲线明显向左上方移动,提高了奥氏体转变的开始温度;随着冷却速度的增大,显微组织由多边形铁素体、珠光体和少量贝氏体逐渐过渡到针状铁素体、粒状贝氏体,最后为板条贝氏体和马氏体.     

Influence of V/P Ratio on the Catalytic Performance of VPO/SiO_2 Catalysts for Ammoxidation of Chloro-Substituted Toluenes

A series of vanadium phosphate oxide(VPO) catalysts supported on silica(VPO/Si O2) with various mole ratios of V/P(nV:nP=1:0.8-1:3) were prepared through impregnation method. The catalytic activity was evaluated by ammoxidation reactions of several kinds of chloro-substituted toluenes(CT) in a fixed-bed reactor. The catalyst presented the best performance when nV:nP is 1:1.6. The prepared catalysts were characterized by N2 adsorption, hydrogen temperature programmed reduction(TPR) and ammonia temperature programmed desorption(TPD) and etc. The results reveal that P can decrease the bonding energy of V=O and increase the mobility of lattice oxygen which was beneficial for the improvement of the catalysts, while too much P can greatly decrease the average oxidation number of V which leads to deactivation of the catalysts. The surface acidity of the VPO/Si O2 catalysts is affected by nV:nP and the catalyst had the highest surface acidity when nV:nP is 1:1.6. The selectivity of catalysts is proportional to the surface acidity when nV:nP is lower than 1:3.0.     

Genome-wide atlas of gene expression in the adult mouse brain

Molecular approaches to understanding the functional circuitry of the nervous system promise new insights into the relationship between genes, brain and behaviour. The cellular diversity of the brain necessitates a cellular resolution approach towards understanding the functional genomics of the nervous system. We describe here an anatomically comprehensive digital atlas containing the expression patterns of approximately 20,000 genes in the adult mouse brain. Data were generated using automated high-throughput procedures for in situ hybridization and data acquisition, and are publicly accessible online. Newly developed image-based informatics tools allow global genome-scale structural analysis and cross-correlation, as well as identification of regionally enriched genes. Unbiased fine-resolution analysis has identified highly specific cellular markers as well as extensive evidence of cellular heterogeneity not evident in classical neuroanatomical atlases. This highly standardized atlas provides an open, primary data resource for a wide variety of further studies concerning brain organization and function.     

高压氧综合治疗耳带状疱疹伴面瘫疗效的观察

目的探讨高压氧综合治疗耳带状疱疹伴面瘫的临床价值.方法对28例耳带状疱疹伴面瘫药物 高压氧综合治疗(HBO组),治疗压力0.2~0.25 mPa(0.2~0.25 ATA),吸纯氧60 min,1次/d,10次为1个疗程,平均治疗2个疗程.单纯药物治疗者15例为对照组.结果HBO组同期治疗中见效快,病程明显缩短,神经功能恢复良好,总有效率89.3%(高压氧治疗2个疗程时的面神经功能评价).同对照组(同期治疗总有效率53.3%)比较差异有统计学意义(P<0.05).随访5~24个月,面部神经功能恢复97.5%.结论高压氧综合治疗耳带状疱疹伴面瘫疗效好,面肌功能恢复快,是一种安全可靠的治疗手段.     

普通大学生和大学生运动员内隐完美主义的差异

选择某体育大学本科生66人,包括普通大学生30人,不同项群大学生运动员36人(其中速度型6人、表现难美型5人、隔网对抗型14人、同场对抗型11人),进行运动内隐联想测验,对普通大学生和大学生运动员的内隐完美主义以及不同项群间运动员内隐完美主义进行探讨研究.结果发现,大学生运动员比普通大学生在IAT得分上存在显著差异(p0.01),不同项群间大学生运动员IAT得分无显著差异(p=0.793).由此得出结论:大学生运动员比普通大学生有更高的内隐完美主义倾向;速度型、表现难美型、隔网对抗型和同场对抗型的大学生运动员在内隐完美主义倾向上没有差异.     

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