氩等离子体辐照反相乳液接枝改性涤纶织物的研究

首次提出了在等离子体辐照后再用反相乳液接枝改性涤纶织物的新方法,探讨了接枝颗粒特征以及织物各项物理力学性能.接枝织物的结构及性能的测试结果表明:接枝物的尺寸远小于纤维的直径,在提高织物吸湿性的同时,对织物透气性能和强力等无明显影响;实验也证实了乳液中未接枝单体可以再次聚合.     

两种塑料纸芯管结构与性能比较分析

测试与分析了两种塑料管材的拉伸与弯曲性能、热变形温度、结晶性和化学组成,分析结果表明:管材B较管材A具有更高模量与热变形温度,但管材B较高的分子量与较小的分子量分布抑制管材产品内在的均匀性,且管材B中的α晶在高温下向β晶的转变可能会影响管材长期使用性能.     

纵横波联合反演在苏里格含气性检测中的应用

苏里格气田目的层属于辫状河和曲流河沉积环境下的多种砂体组合，而且含气层速度值与泥岩的速度值有较大的重叠。因此，单纯纵波反演在该地区不能有效地剔除低速泥岩，区分致密砂岩与有效砂岩。AVO理论和实践证明，含气砂岩随饱和度的下降，纵波速度明显变化，而横波速度变化较小。纵横波联合反演可得到纵波阻抗和横波阻抗，进而可有效区分岩性。纵波阻抗和横波阻抗的比值，可消除密度项得到纵横波速度比。根据Aki Richards公式可知，在纵横波速度比为1.5左右时，可确定砂岩含气。据此，在推导纵横波联合反演公式和确定反演过程的基础上，对苏里格气田某测线进行纵横波联合反演，得到纵波阻抗、横波阻抗和纵横波速度比，从而确定了低速泥岩、致密砂岩与有效砂岩的分布范围。     

Synthesis and Characterizations of Triphenylamine End-Functionalized Polymers via Reversible Addition-Fragmentation Chain Transfer Polymerization

A novel reversible addition-fragmentation chain transfer (RAFT) reagent bearing triphenylamine (TPA) group, 4-diphenylamino-dithiobenzoic acid benzyl ester (DDABE), was designed and synthesized. It was used in the RAFT polymerizations of styrene (St) and methyl acrylate (MA) to prepare end-functionalized polymers. The results of the polymerization showed that the RAFT polymerizations could be well controlled using DDABE as the RAFT agent. Number-average molecular weight (M_n,GPC) increased linearly with monomer conversion, and molecular weight distributions were relatively narrow (PDI< 1.50). The results of chain-extension reaction, ¹H NMR spectra and UV/Vis spectra confirmed that most of the polymers chains were end-capped by the functional triphenylamine (TPA) groups. The effect of feed molar ratios of St/DDABE/AIBN on polymerization was investigated.     

全球粮食危机中化肥产业面临的问题与对策

从国内外整体形势来看,通货膨胀带来的粮食危机正在全球蔓延,化肥供应不稳、价格不断增长已经对粮食生产以及农业甚至国家经济平稳发展形成了严重影响.能源和粮食紧张将是我国长期面临的问题,这就决定了化肥产业的发展方向.在产业内部,必须走向大型化基础产业与小型服务型产业结合的道路,各种产品应该根据商品特性和农业需求进行市场细分.建议国家加强对化肥产业的宏观调控、转变调控方式,加强市场需求的预警预测和实时调节,提高国家对肥料施用技术的支持力度.同时建议企业做好信息分析工作,及时做出有利于国家和企业长远发展的决策,不应盲目跟随涨价而丧失市场,当前应利用化肥涨价的时机开展技术服务工作,抢占化肥市场制高点.     

Effects of Spatial Characteristics on Smart Antenna System with Uniform Linear Antenna Array

1IntroductionCurrently,smart antenna technology can greatly en-hance system performance and i mprove the system ca-pacity so that it has been considered as a keytechnologyinthe third generation wireless communicationsystems .The researches on channel model , beamforming algo-rithms and receive algorithms have been widely carriedout and a great many of proposition have beensubmittedtothe 3th Generation Project Partner (3GPP) . Fromthe viewpoint of link-level and system-level research,many asp…     

熟悉而又陌生

《Frame》总第46期向读者展示了许多有意思的想法和创意的细节下面是从中摘选出来的设计和空间方案他们都运用到了我们身边很熟悉的元素，在这里“腐朽”一下化神奇了。[编者按]     

提高常规色谱分析的速度,应对新法规的需求

珀金埃尔默公司新推出的Clarus 600型GC和GCMS采用全新柱温箱设计，能够缩短每次分析循环的时间，在有限的时间内可以完成更多的分析测试，从而提高分析效率和仪器的投资回报率。特别适合于需要大批量分析检测的实验室和需要测定挥发性有机物的分析工作。     

关于木糖(醇)生产过程中环保、清洁、节能生产方法的研究

本文从环境保护角度,面对木糖(醇)生产过程中大污染、高能耗,寻找解决办法,实现可持续发展的目标.     

Analysis of S-SEED''s characteristics in optical switch

This article introduces the basic structure of a symmetric self-electrooptic effect device （S-SEED）, and applies the Kirchoff＇ s current law and a purely equivalent capacitive model, to analyze S-SEED＇s switch characteristics. Linear approximation and N-segment approximation are utilized to obtain S-SEED＇s voltage-time （V-T） and characteristics. Theoretical analysis is verified by simulations, and the results demonstrate that the precision of S-SEED＇s switch time can satisfy the requirement in applications with linear approximation. Moreover, the simulations compare S-SEED＇s switch characteristics with different input powers and input contrast ratios, which reveal that increasing input contrast ratio is an effective way to improve S-SEED＇s switch characteristics.