ELECTRONIC EFFECTS OF POLYFLUORINATED SUBSTITUENTS ON THE POLYMERIZATION AND THE PROPERTIES OF POLYTHIOPHENES

Three series of polythiophenes containing fluoroalkoxy and fluoroether substituentswere prepared by electrochemical polymerization. The effect of substituents with fluoro-alkoxy or ether functional groups on the electrochemical polymerization of thiophene mono-mers and properties of the obtained polymers were analyzed. The introduction of a flu-oroether functional group at the 3-position of the thiophene ring leads to an increase ofthe oxidation potential of the monomer and to a decrease of the conductivity of the re-sulting polymers, even with the use of a CH_2 group as spacer. Conversely, the presenceof an oxygen atom directly at the 3-position of the thiophene ring, which offsets the nega-tive withdrawing effect of fluoroalkyl groups, facilitates the synthesis of highly conductingpolythiophenes.     

内蒙古海拉尔盆地拉张史分析

该文用地质恢复法研究了内蒙古海拉尔盆地的拉张历史。结果发现:海拉尔盆地的拉张强度在平面上西强东弱,南强北弱;在纵向上可分为A,B,C,D四种不同的类型。拉张强度在一定程度上控制了盆地(断陷)中生油岩的发育。     

偶氮氯膦-mA光度法测定合金中微量铋

本文研究了显色剂偶氮氯膦—mA在强酸性环境中与铋(Ⅲ)的显色反应。在掩蔽剂存在下,该显色反应有较好的选择性。利用本法可以直接测定合金中微量的铋,方法简便,结果准确。     

STUDY ON SYNTHESIS OF HIGH VINYL POLYBUTADIENE WITH TETRAVALENT MOLYBDENUM CATALYST SYSTEM

In this paper the catalytic behaviour of tetravalent molybdenum catalyst system in polymeriza-tion of butadiene is dealt with. The effects of the variety of apions combined with molybdenumatom, the pattern of the substituent R in (i-Bu)_2AlOR and the polymerization conditions on thebutadiene conversion, the molecular weight and its distribution and the microstructure of the polymeralso are studied. It has been found that the catalyst system is significantly active when anions com-bined with the molybdenum atom are acetoxy (CH_3COO-),or ethoxy (C_2H_5O-). Obviously, thevariety of substituent R in (i-Bu)_2 AlOR has a great influence on the catalytic activity. The catalystsystem is inactive if the R group is--COR' (R'is alkyl or aromatic group) or alkyl, whereas the activityof the catalyst system increases if the R group is phenyl or tolyl. With the rise of polymerizationtemperature the polymer molecular weight decreases, the distribution index of molecular weight in-creases and the content of 1,2-unit in polybutadiene reduces.     

Chemical reaction dynamics of Rydberg atoms with neutral molecules: a comparison of molecular-beam and classical trajectory results for the H(n)+D2-->HD+D(n') reaction

Recent molecular-beam experiments have probed the dynamics of the Rydberg-atom reaction, H(n)+D2-->HD+D(n) at low collision energies. It was discovered that the rotationally resolved product distribution was remarkably similar to a much more limited data set obtained at a single scattering angle for the ion-molecule reaction H++D2-->D++HD. The equivalence of these two problems would be consistent with the Fermi-independent-collider model (electron acting as a spectator) and would provide an important new avenue for the study of ion-molecule reactions. In this work, we employ a classical trajectory calculation on the ion-molecule reaction to facilitate a more extensive comparison between the two systems. The trajectory simulations tend to confirm the equivalence of the ion+molecule dynamics to that for the Rydberg-atom+molecule system. The theory reproduces the close relationship of the two experimental observations made previously. However, some differences between the Rydberg-atom experiments and the trajectory simulations are seen when comparisons are made to a broader data set. In particular, the angular distribution of the differential cross section exhibits more asymmetry in the experiment than in the theory. The potential breakdown of the classical model is discussed. The role of the "spectator" Rydberg electron is addressed and several crucial issues for future theoretical work are brought out.     

丁二烯聚合镍催化剂的磁性

在通常镍系Ni(naph)_2-Al(i-Bu)_3-BF_3OEt_2和改型镍体系Ni(naph)_2-Al(i-Bu)_2(OR)-BF_3OEt_2中,助催化剂的还原能力顺序为Al(i-Bu)_3>Al(i-Bu)_2(OPhC_8H_(17))>Al(i-Bu)_2(OPhCH_3)>Al(i-Bu)_2(OPh)>Al(i-Bu)_2(OC_8H_7)在Ni(naph)_2-Al(i-Ba)_2(OC_8H_(17))-BF_3OEt_2体系中镍以Ni(Ⅰ)存在为主,其它体系中均Ni(0)和Ni(Ⅰ)共存为特点。Bd的预混能促进各体系中Ni(Ⅱ)→Ni(Ⅰ)的反应。在Ni(naph)_2-Bd-Al(i-Bu)_2(OPh)和Ni(naph)_2-Bd-Al(i-Bu)_2(OPhCH_3)体系中有Ni(0)聚集体,显铁磁性,而其它体系均显顺磁性。     

扬子地块北缘贵池地层区沉积地层的稀土元素组成及其地质意义

对扬子地块北缘贵池地层区从震旦系到三叠系沉积地层各种岩石的稀土元素组成研究表明，全剖面稀土平均含量低于沉积岩的平均含量，但与地台区十分接近。按岩类平均，页岩稀土含量最高，砂岩及粉砂岩闪之，灰岩最低。不同时代地层稀土含量受岩性控制，以碳酸盐为主的奥陶系，三叠系地层和稀土含量最低，以陆源碎屑岩为主的志留系，泥盆系地层最高。     

160KA铝电解槽电、热解析及仿真试验

本文提出了一个铝电解槽阴极分区电、热解析模型及其仿真程序,并通过现场实测对该程序进行了初步验证.利用此程序对160kA中间下料、预焙槽的阴极部分进行了仿真试验.找出了能改善槽膛内形并能降低能耗的改良槽衬结构方案.此种仿真试验法能有效地提高铝电解槽设计的技术水平.     

青少年双相障碍Ⅱ型和单相抑郁 的认知功能比较研究

目的 比较青少年双相障碍Ⅱ型和单相抑郁症之间认知功能的差异。方法 对54 例青少年双相障碍Ⅱ型和83 例 青少年单相抑郁症患者在抑郁发作时作认知功能测验，包括：中国韦氏成人智力量表（WAIS-RC）、连线测验（TMT）、持续操作测验（CPT）、韦氏记忆量表（WMS-RC）、词语流畅性测验（VF）、威斯康星卡片分类测验- 改良版（WCST），并与50 例健康对照组比较。经过6 周治疗后，对抑郁症状缓解（HAMD≤7 分）患者重复上述认知功能测验。结果 入组时双相障碍Ⅱ型和单相抑郁两组在认知功能方面广泛受损，表现为TMT-A、WAIS-RC 数字符号、CPT、WAIS-RC 数字广- 倒背、WAIS-RC视觉再生、VF、WCST 和TMT-B项目上与健康人群相比明显成绩差，差异均有统计学意义（均P＜0.01），但双相障碍Ⅱ型和单相抑郁两组间比较差异无统计学意义（P＞0.05）。治疗6 周后，对两组临床痊愈的患者重复测验，发现两者在WAIS-RC 数字符号和WAIS-RC 视觉再生方面存在持续性损伤，与健康对照组比较差异均有统计学意义（P＜0.05）。双相障碍Ⅱ型患者在CPT 项目上存在损伤，与健康对照组比较差异有统计学意义（P＜0.05）。而单相抑郁症患者表现为VF和TMT-B 项目上存在损伤，与健康对照组比较差异有统计学意义（P＜0.05）。结论 双相障碍Ⅱ型和单相抑郁在抑郁状态时，认知功能广泛受损，两者比较无统计学差异。在抑郁症状缓解后，双相障碍Ⅱ型表现为持续性注意 功能障碍，而单相抑郁表现为执行功能障碍。     

用于犯罪空间聚集态研究的优化聚类算法

针对犯罪空间聚集态研究算法中有关窗宽优化选择问题,将动态优化窗宽算法与DENCLUE(DENsity-based CLUstEring)算法结合,提出一种新的聚类算法。以入室盗窃案件为例,研究了该算法在犯罪热点探测方面的应用。结果显示引入优化窗宽算法后,可得到较为精确的聚类中心位置及概率密度变化趋势,并且当格网边长与邻近格网距离阈值及邻近点距离阈值之比为2:3:1时会得到较好的热点分析结果。通过分析犯罪热点分布图,可协助公安机关调整警力配置,加强案件高发区警力巡逻。