镍-钛复合负载催化剂乙烯气相聚合研究 Ⅰ.含NiCl_2组份钛系催化剂制备支化聚乙烯

采用反应法,将ＮｉＣｌ_２与ＴｉＣｌ_４负载于复合载体ＭｇＣｌ_２－ＳＯｆ_２上,制得新型双过渡金属催化体系ＴｉＣｌ_４－ＮｉＣｌ_２／ＭｇＣｌ_２－ＳｉＯ_２／Ａｌ（ｉ－Ｂｕ）_３．该催化剂用于乙烯气相聚合,当ｘ（Ｎｉ）为１２．５％时,催化剂效率最高,聚合动力学属衰减型．催化剂因含有镍化合物具有齐聚及原位共聚性能,得到的聚乙烯具有支化度为３．６～７．２支化数／１０００Ｃ的中密度聚乙烯,且产物相对分子质量增大。     

复合型纳滤膜的制备及表征

在聚砜基膜上用界面聚合法制备了两种复合型纳滤膜ＰＡ０１和ＰＡ０２。在０．３ＭＰａ下,ＰＡ０１膜对ＭｇＳＯ４溶液和ＦｅＣｌ３溶液的脱直 ９６．０％和７８．０％,水通量分别为８．５（Ｌ．ｍ＾－２．ｈ＾－１）和７．９（Ｌ．ｍ＾－２．ｈ＾－１）;ＰＡ０２膜对ＭｇＳＯ４ｉｐｗｋｉｙｗ （２．０ｇ．Ｌ＾－１）和ＣａＣｌ溶液（０．５ｇ．Ｌ＾－１）的脱盐率分别为９８．０％和８８．８％,水通量分别为１．０（Ｌ。ｍ＾     

DISA线高硫铁水的型内球化

在ＤＩＳＡ垂直分型线上对高硫铁水进行型内球化处理实验，球化剂系数（Ｓ·Ｆ）为０．０４７ｋｇ／ｓ·ｃｍ＾２，球化剂ＭｔＭｇ７－８合金加入量为１．０￣１．２％时得到了良好的效果。     

镍—钛复合负载催化剂乙烯气相聚合研究：Ⅰ.含NiCl2组？…

采用反应法,将ＮｉＣｌ２与ＴｉＣｌ４负载于复合载体ＭｇＣｌ２－ＳｉＯ２上,制得新型双过渡金属催化体系ＴｉＣｌ４－ＮｉＣｌ２／ＭｇＣｌ２－ＳｉＯ２／Ａｌ（ｉ－Ｂｕ）３。该催化剂用于乙烯气相聚合,当ｘ（Ｎｉ）为１２．５％时,催化剂效率最高,聚合动力学属衰减型。催化剂因含有镍化合物具有齐聚及原位共聚性能,得到的聚乙烯具有支化度为３．６－７．２支化数／１０００Ｃ的中密度聚乙烯,且产物相对分子质量增大。     

LCAS SiC_w ZrO_2复合材料的力学性能及其微观结构

研究了ＬＣＡＳＳｉＣｗＺｒＯ２ 复合材料的力学性能及其微观结构．力学性能分析表明：ＳｉＣｗ 增韧和ＺｒＯ２ 相变增韧的加和性不是简单地叠加,ＳｉＣｗ 增韧提高了ＺｒＯ２ 相变增韧效果．体积分数分别为５５ ％ ,３０％ ,１５％ 的ＬＣＡＳ,ＳｉＣｗ ,ＺｒＯ２ 复合材料的断裂韧性Ｋ１Ｃ和抗弯强度σｂ 达到６－４ ＭＰａ·ｍ１／２ 和３３１－７ ＭＰａ．透射电镜（ＴＥＭ） 图象表明：复合材料中ＺｒＯ２ 起了应力诱导相变增韧作用;ＬＣＡＳ／ＳｉＣｗ 界面较清晰,其宽度约１５ ｎｍ ;搭在ＬＣＡＳ／ＳｉＣｗ 界面两侧的杆状ＴｉＣ 颗粒增加了界面结合强度     

甘蓝型油菜萝卜质不育系恢复材料Ad-6(F4)测交二代恢复株TCF2的快繁及生根

油菜萝卜胞质不育系恢复材料Ａｄ－６（Ｆ４）测交二代恢复株ＴＣＦ２,在ＭＳ附加５ｍ ｇ／Ｌ６－ＢＡ＋ ０．５ｍ ｇ／Ｌ ＮＡＡ,３ｍ ｇ／Ｌ ６－ＢＡ＋ ０．２ｍ ｇ／Ｌ ＮＡＡ,３ｍ ｇ／Ｌ ６－ＢＡ＋ ０．３ｍ ｇ／Ｌ ＮＡＡ＋６００ｍ ｇ／Ｌ水解乳蛋白以及５ｍ ｇ／Ｌ６－ＢＡ＋ ０．３ｍ ｇ／ＬＮＡＡ＋ ５ｍ ｇ／ＬＡｇＮＯ３ 的不同培养基上诱导丛生芽,结果表明５ｍ ｇ／Ｌ６－ＢＡ＋ ０．３ｍ ｇ／ＬＮＡＡ＋ ５ｍ ｇ／ＬＡｇＮＯ３ 对ＴＣＦ２ 诱导丛生芽有较好的效果．小芽生根培养基为１／２ＭＳ效果最好．     

Friedel－Crafts反应合成无规支化聚苯乙烯及其支化结构表征

将阴离子聚合所得窄分布聚苯乙烯（ｄ＜１．１）在无水ＺｎＣｌ＿２催化下以氯甲醚对其进行氯甲基化（Ｃ１％＜１．５），再用自制无水ＡｌＣｌ＿３作催化剂，使氯甲基化聚苯乙烯（ＣＭＰＳ）发生大分子链间的Ｆｒｉｅｄｅｌ－Ｃｒａｆｔｓ反应，一步合成主链与支链等长的无规支化聚苯乙烯（ＡＢＰＳ）．研究了支化反应条件及支化结构，实验表明，反应条件：Ｔ＝４０～４５Ｃ、Ｃ＿（ＣＭｐＳ）＝０．１～０，１５ｇ·Ｍｌ￣（－１）、Ｃ＿（ｃａｔ）＝０．０５～０．１ｇ·ｍｌ￣（－１）、ｔ＞ｌ２ｈ达到良好的支化效果，支化臂数为１～２０．     

极谱吸附波连续测定水样中痕量锌,锰和硒

在酒石酸－乙二胺－高氨酸－亚硫酸钠－高碘酸钟体系中痕量锌锰和硒出现良好极谱吸附波，波峰敏锐，可测定浓度范围在０．４０～４０μｇ／Ｌ　Ｚｎ￣（２＋）１．６～８０μｇ／ＬＭｎ￣（２＋）及０．０２～２．３μｇ／ＬＳｅ（Ⅳ）。对含１１．７μｇ／Ｌ　Ｚｎ￣（２＋），７．０μｇ／Ｌ　Ｍｎ，１．４５μｇ／Ｌ　Ｓｅ（Ⅳ）的矿泉水样测定，其相对标准偏差分别是６．２％和９．２％和７．３％。     

近红外荧光探针法测定核酸的研究

以阳离子花菁染料为荧光探针, 依近红外荧光猝灭测定核酸． 最大激发及发射波长分别为７６５ 、７９０ｎｍ ． 核酸测定的线性范围为０－０８ ～１－２μｇ／ｍ Ｌ（ＣＴＤＮＡ 及ＳＭ ＤＮＡ） , ０－１ ～１－６μｇ／ｍＬ（ｙｅａｓｔ ＲＮＡ） ．     

水－乙二醇体系中氯化氢的电池热力学

测定了２９３．２～３２３．２Ｋ间的７个温度下电池ＧＥ｜Ｈ２Ｏ（１－ｗ）＋Ｅｎ（ＯＨ）２（ｗ）＋ＨＣｌ（ｍ）｜ＡｇＣｌ－Ａｇ的电动势，由此求得了上述７个温度下，ｍ＝０．００２０，０．００５０，０．０１００，０．０５００，０．１０００ｍｏｌ／ｋｇ的ＨＣｌ在０～９０％乙二醇—水二元混合溶剂中的平均活度系数γ±与Ｐｉｔｚｅｒ参数；ＨＣｌ自水向各组成Ｅｎ（ＯＨ）２—Ｈ２Ｏ混合溶剂中的标准迁移自由能，标准迁移熵和标准迁移焓．最后从分子间相互作用的角度对ＨＣｌ在该混合溶剂中的热力学行为给予了理论解释．     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to