面向中文专利文献的有标记并列结构的统计分析

该文在中文专利语料的基础上,统计分析了中文专利文献中有标记并列结构的内部特征和外部特征。内部特征主要考察了中文专利文献中有标记并列结构的并列标记、并列结构内部分析和词性分布等。外部特征主要统计了可能的边界特征词,并分析了有标记并列结构在中文专利文献中出现的外部环境。     

电路板用低介电纤维布

文章介绍了电路板用的低介电纤维及其制作纤维布和电路板基材的实验。通过将环烯烃共聚物（COC）纤维与玻璃纤维结合在独特的混合布中制成低介电（εr3．08,Dk0．013）电路板基材;将混合布中环烯烃共聚物纤维熔化构成树脂的一种成分,制成εr3．25,Dk0．0013电路板基材;将含环烯烃共聚物纤维混织布涂上独特的低介电树脂制成εr2．8,Dk0．0009电路板基材的试验,表明环烯烃共聚物纤维布是一种新型的性能优异的电路板增强材料。     

Infrastructure‐based vehicular congestion detection scheme for V2I

With the increasing number of vehicles, traffic jam becomes one of the major problems of the fast‐growing world. Intelligent transportation system (ITS) communicates perilous warnings and information on forthcoming traffic jams to all vehicles within its coverage region. Real‐time traffic information is the prerequisite for ITS applications development. In this paper, on the basis of the vehicle‐to‐infrastructure (V2I) communication, a novel infrastructure‐based vehicular congestion detection (IVCD) scheme is proposed to support vehicular congestion detection and speed estimation. The proposed IVCD derives the safety time (time headway) between vehicles by using iterative content‐oriented communication (COC) contents. Meanwhile, the roadside sensor (RSS) provides an infrastructure framework to integrate macroscopic traffic properties into the estimation of both the traffic congestion and vehicle safety speed. The main responsibilities of RSS in IVCD are to preserve privacy, aggregate data, store information, broadcast routing table, estimate safety speed, detect traffic jam, and generate session ID (S‐ID) for vehicles. Monte Carlo simulations in four typical Chinese highway settings are presented to show the advantage of the proposed IVCD scheme over the existing Greenshield's and Greenberg's macroscopic congestion detection schemes in terms of the realized congestion detection performance. Real road traces generated by Simulation of Urban Mobility (SUMO) over NS‐3.29 are utilized to demonstrate that the proposed IVCD scheme is capable of effectively controlling congestion in both single and multilane roads in terms of density and speed health with previous schemes in this field.     

微孔型COC/PETG收缩薄膜的制备以及性能研究

利用单向牵伸工艺,在PETG原材料中添加一定比例的COC,制备了45μm的微孔型COC/PETG收缩薄膜。利用SEM、紫外分光光度计、收缩率测试仪、收缩力测试仪、电子拉伸机等分别对薄膜的微孔形貌、结构以及微孔对薄膜收缩行为的影响进行了深入分析。结果显示,20%(质量分数)含量COC的加入使PETG收缩薄膜内部产生了尺寸为3~10μm的微孔,孔隙率可达到25%,微孔的存在一定程度上降低了薄膜的拉伸强度,但大大改善了薄膜纵向的收缩率曲线,降低了薄膜的收缩内应力,并达到了阻隔紫外线的效果。     

体外培养猪COCs影响因素的研究

作者以Hoechst33342-PI荧光染色法检测卵丘细胞凋亡/坏死,研究猪COCs体外成熟过程中卵泡直径、卵丘细胞扩展、COCs培养前评分、激素等因素对猪COCs的卵丘细胞及卵母细胞的影响。结果表明:猪COCs卵丘细胞凋亡/坏死与卵泡直径相关,组间差异显著(P0.05),卵泡直径影响卵母细胞成熟率,组间差异极显著(P0.01);随着培养前猪COCs评分的降低,卵丘细胞凋亡率升高,卵母细胞成熟率有下降趋势,且差异显著(P0.05);培养后卵丘细胞扩展良好的卵丘细胞的凋亡率相对较高,但差异不显著(P0.05),卵丘细胞的扩展程度对卵母细胞成熟率影响不显著(P0.05)。体外成熟培养液中添加生长激素可以抑制卵丘细胞凋亡并提高卵母细胞发育能力(P0.05)。卵泡直径,COCs培养前评分,激素影响COCs猪卵丘细胞凋亡与卵母细胞成熟。     

支持COC的低层高性能通信库

COC(aClusterofClusters)是指由多个集群组成的大集群系统,COC中的各个集群可能是用不同网络协议连接的。设计基于COC的高性能通信库对于提高并行应用系统的可移植性等具有重要意义。AN是在低层实现的支持COC通信的高性能通信库系统,它支持以太网,Infiniband和FC通信协议,用AN开发的应用程序在这些网络环境下不用重新编译就能运行。由于AN的设计并没有牺牲各种网络的硬件特性,所以能实现高吞吐量低延迟的通信。在AN的基础上可以开发全局操作系统和MPI通信库等各种软件。测试表明,AN是一个适合集群计算的高性能通信库系统。     

Surface modification of cyclic olefin copolymer substrate by oxygen plasma treatment

Cyclic olefin copolymer (COC) substrate surface was modified by plasma treatment under oxygen atmosphere. The surface properties were evaluated by contact angle measurement, atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS). It was found that the surface acquired oxygen containing polar functional groups such as C-O, C = O, which increased in number as the plasma treatment time increased. As revealed by AFM profile, these changes were accompanied by a slightly increase in roughness. The adhesive ability between the coating layer (ITO) and the COC surface can be improved after optimum plasma treating procedure, which can be proofed by the optical microscope observation after boiling test.     

Compatibilisation of polypropylene–polystyrene blends: Part 1 – Effect of mixing intensity on morphology andrheological properties

Abstract

Propylene copolymer blends have been prepared using a proprietary, in reactor, grafting polymerisation technique, to give two phase materials composed of 70% polypropylene, 20% polystyrene, and 10%polypropylene- graft-polystyrene (PP-g-PS). The present study was carried out to determine the efficiency of PP-g-PS relative to block-copoly(styrene/ethylene–butylene/ styrene) (SEBS) as a compatibiliser for polypropylene–polystyrene blends by measuring rheological properties and examining the morphological structure. Mixing experiments were conducted on a twin screw mixing element evaluator and on a commercial ZSK-30 extruder. Dynamic mechanical analysis was used to characterise the viscoelastic properties of the extruded polymer pellets and transmission electron microscopy was used to examine the morphology of the polymer throughout its processing history, i.e. from carcasses at different stages of the mixing operations to injection moulded specimens. Both the graft copolymer, PP-g-PS, and the black terpolymer, SEBS, were found to enhance the compatibilisation of the blends, but the graft copolymer was found to be more effective. The results also show that the intensity of mixing affects the molecular and morphological structures of the graft and graft–rubber blends, as indicated by the intrinsic viscosity values of the extracted isotactic polypropylene fraction of the blends. This is supported by morphological examination of the graft blend, which showed a phase inversion from co-continuous to dispersed phase morphology during extrusion.     

Influence of modified polyethylene compatibilizer on filler dispersion and flammability characteristics of linear low density polyethylene/cyclo olefin copolymer blends containing flame retardant combinations

In this study, the combination of organomodified montmorillonite (MMT), magnesium hydroxide (MDH), graphene oxide (GO) and expandable graphite (EG) as intumescent flame retardant for Linear Low-Density Polyethylene-Cyclo-Olefin Copolymer (LLDPE/COC) blends has been investigated. An amine-alcohol modified polyethylene (PEgDMAE) was used as compatibilizer. Limiting oxygen index (LOI), cone calorimeter determinations and flammability test (Underwriters Laboratory – UL-94) were used to evaluate the flame retardant properties. The structural characterization was measured by FTIR and scanning electron microscopy (SEM). The mechanical properties were also evaluated by Dynamic-mechanical analysis (DMA). The PEgDMAE compatibilizer enhanced the filler dispersion and increased the LOI to 22% for clay, 23% for GO and 26.5% for EG composites. The results indicated that the combination of each additive makes it possible to reduce the total Magnesium hydroxide filler content from 55 to 20% to achieve the flame retardant requirements. The flame retardant and mechanical properties of LLDPE/COC blends increased to a higher extent when using the combination of these additive fillers.