含长共轭取代基的丙烯酸酯的合成

文章通过在具有一定共轭链长的芴寡聚物的分子末段引入醇羟基,把长共轭结构的芴寡聚物作为取代基引入丙烯酸酯类单体.利用核磁共振确定了目标产物的分子结构,合成的单体具有强烈的紫外吸收和光致发光性质,而且由于在丙烯酸酯引入了芴寡聚物,产物可以用旋涂的方法在石英玻璃表面成膜,其在溶液中和固体薄膜最大发光位置分别是412 nm和442 nm.     

量子点层厚度对量子点发光二极管发光特性的影响

采用湿法旋涂技术制备量子点发光二极管器件(QD-LEDs)。PEDOT作为空穴注入层,TFB作为空穴传输层,量子点作为发光层,采用无机二氧化钛(TiO2)作为电子传输层,在相同的工艺条件下调节量子点层旋涂转速(800~1 100r/min),制备不同厚度的量子点发光二极管发光器件(QD-LEDs)。实验结果表明,当量子点层的旋涂转速为900r/min时,此时的量子点层厚度为30nm,所制备的量子点发光二极管器件(QD-LEDs)的发光性能最好,开启电压最低,只有5.5V。     

量子点层厚度对量子点发光二极管发光特性的影响简

采用湿法旋涂技术制备量子点发光二极管器件（QD-LEDs）。PEDOT作为空穴注入层,TFB作为空穴传输层,量子点作为发光层,采用无机二氧化钛（TiO2）作为电子传输层,在相同的工艺条件下调节量子点层旋涂转速（800～1100 r/min）,制备不同厚度的量子点发光二极管发光器件（QD-LEDs）。实验结果表明,当量子点层的旋涂转速为900 r/min时,此时的量子点层厚度为30 nm,所制备的量子点发光二极管器件（QD-LEDs）的发光性能最好,开启电压最低,只有5．5 V。     

陶瓷厚膜无机电致发光显示器中ZnS∶Mn发光层的优化制备

为了提高陶瓷厚膜无机电致发光显示器的亮度,采用陶瓷基片/内电极/陶瓷厚膜/发光层/上绝缘层/透明电极的器件结构系统研究了ZnS:Mn发光层的制备工艺.结果表明当优化的发光层厚度为600 nm,沉积温度为280 ℃时制备ZnS:Mn发光层可以获得器件的最大亮度.在高温500 ℃退火时,器件的亮度-驱动电压曲线最优.发光层结晶性的改善和Mn 的均匀扩散,使得优化的沉积温度和退火温度制备的ZnS:Mn发光层具有良好的光电特性.     

陶瓷厚膜无机电致发光显示器中ZnS∶Mn发光层的优化制备

为了提高陶瓷厚膜无机电致发光显示器的亮度,采用陶瓷基片/内电极/陶瓷厚膜/发光层/上绝缘层/透明电极的器件结构系统研究了ZnS∶Mn发光层的制备工艺.结果表明当优化的发光层厚度为600 nm,沉积温度为280℃时制备ZnS∶Mn发光层可以获得器件的最大亮度.在高温500℃退火时,器件的亮度-驱动电压曲线最优.发光层结晶性的改善和Mn 的均匀扩散,使得优化的沉积温度和退火温度制备的ZnS∶Mn发光层具有良好的光电特性.     

一种含叔丁基的螺二芴类空穴传输材料的制备及性能表征

以一端含有叔丁基的二氨基螺二芴化合物为起始原料,经过桑德迈尔反应与Ullman反应,制备出一种螺二芴类空穴传输材料,玻璃化温度高于320℃,远高于目前广泛使用的空穴传输材料(NPB).目标分子用作电致磷光器件中的空穴传输层,所得到的器件与传统的器件(以NPB为空穴传输层)相比,其能量效率、电流效率和外量子效率等性能更为优越.且由于具有高的三线态能级,器件中不需要插入第二空穴传输层4,4',4″-三-(N-咔唑基)-三苯基胺(TCTA),提高了器件的效率,降低了器件的制作成本.作为有机电致发光(OLED)器件的空穴传输材料,其有望取代目前广泛使用的NPB,特别在有机电致磷光领域具有良好的实用前景.     

聚对苯乙烯聚氧化乙烯共聚物发光材料的合成及性能

通过Wittig反应成功地合成了一种新型的聚对苯乙烯和长链聚氧化乙烯的嵌段共聚物(PPVPEC)600)．该共聚物在常温下为无定形结构，并可旋涂形成均一稳定的薄膜；玻璃化转变温度为～46．3℃，N2环境下热分解温度达359℃；可以直接掺杂锂盐制备结构为ITO／PPVPEO600(LiClO4)/Au的发光电化学池器件，起亮电压为2．6V，其发光波长在蓝绿光范围内，有2个峰值分别是458和485nm。     

新型芴取代喹喔啉电子传输材料的合成及其发光性能表征

由2,3-二芴基取代的双酮结构,合成出两种2,3-二芴基取代的含氟取代基的喹喔啉类小分子S1和S2.新的化合物因为含有氟取代基和喹喔啉结构使得整个分子呈缺电子状态,同时烷基取代的芴使得材料具有良好的溶解性.新的化合物的热分解温度都在400°C以上.测量了由新的化合物作为电子传输材料器件的电流密度-电压-亮度曲线,在相同电压下,四氟取代化合物的电流密度、亮度和效率要明显高于二氟取代的化合物,四氟取代化合物的器件在电压为15 V时的亮度可达到5703 cd/m2.     

溶胶凝胶旋涂方法制备Dy~(3+)掺杂的LaVO_4薄膜(英文)

通过向溶胶前躯体溶液中加入与金属阳离子不同比例的柠檬酸,用溶胶凝胶旋涂方法制备透明并且致密的Dy3+掺杂的LaVO4薄膜.当柠檬酸与金属阳离子的比例为2∶1时,制成的薄膜对可见和红外光的透过率达到90%左右,以波长为310 nm的光激发薄膜时可以得到对应于4F9/2-6H15/2和4F9/2-6H13/2跃迁的波长为484 nm(蓝光)和576 nm(黄光)的发射波,讨论Dy3+掺杂的LaVO4薄膜在染料敏化太阳能电池里的潜在应用.     

磷钨氧化物薄膜的制备及其有机发光二极管

有机发光二极管(OLED)中的高性能材料和新制备工艺一直是该领域的研究热点.以磷钨杂多酸溶液为前驱体,采用旋涂法在氧化铟锡(ITO)阳极上经退火制备磷钨氧化物薄膜,通过不同的退火条件调控薄膜的功函数.以X射线光电子能谱(XPS)、原子力显微镜(AFM)和紫外可见吸收光谱(UV-Vis)表征其组成、表面粗糙度和透光性.以此薄膜作为空穴注入层(HIL),构建结构为[ITO/HIL(35,nm)/NPB(25,nm)/C545T:Alq3(40,nm)/Alq3(15,nm)/LiF(1,nm)/Al(100,nm)]的绿光OLED器件.结果表明,采用旋涂法制备了表面平整、透光度大于92%,及功函数可调的磷钨氧化物薄膜,基于真空中退火的磷钨氧化物空穴注入层的器件表现出优异的发光性能,启亮电压为3.6,V,最大亮度为31,160,cd/m2,最大电流效率为11.54,cd/A,最大功率效率为4.45,lm/W.这一结果为研究金属氧化物空穴注入材料及其成膜方法以及获得高性能发光器件提供了新的启示.     

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