LiF修饰阴极的双层有机电致发光器件发光效率

考虑LiF绝缘缓冲层对电子注入势垒的影响, 给出了LiF/金属复合电极注入势垒的表达式; 基于载流子的注入和复合过程, 建立了双层有机电致发光器件发光效率的理论模型; 讨论了器件效率随电压、注入势垒、内界面势垒、有机层厚度的变化关系. 结果表明: (ⅰ) 当δ_e/δ_h < 2时, 金属/有机物(M/O)界面属于欧姆接触, 当δ_e/δ_h = 2时, M/O界面成为接触限制, 当δ_e/δ_h = 2(Φ_h ≈ 0.2 eV, Φ_e ≈ 0.3 eV)时, M/O界面存在从欧姆接触向接触限制的转变; (ⅱ) η_EL随δ'_e/δ'_h的增大而减小, 但δ'_e/δ'_h>2.5 (H'_h ≈0.2 eV,H'_e >0.4 eV), η_EL的变化趋势变得平缓, 这时载流子注入对器件的η_EL起支配作用; (ⅲ) 逐渐增加L_h/L比值, 较低电压下hR呈下降趋势, 较高电压下η_R则呈上升趋势. 当电压超过启动电压后, 对于给定的L_h/L, 随电压的增大, η_EL是先增加后降低, 且随着L_h/L的增加, η_EL的这种变化趋势更加明显. 这些都与报道的理论及实验结果相符.     

中国低纬高原平流层NOx分布及其与O3的关系

 利用1992年9月～2005年8月的HALOE资料,对我国低纬高原地区上空平流层中NO_x,O₃等大气痕量气体的混合比垂直变化进行了研究,并对本区域不同高度上NO_x混合比与全球同纬度进行了比较,同时对NO_x随时间的演变特征,NO_x的变化周期及NO_x与O₃的相关关系进行了分析.结果表明:①NO_x,O₃混合比先随高度增加,到极值时又逐渐减小;在极值高度上,各个季节NO_x,O₃的混合比值都是夏季最高,冬季最低;②在5 hPa以上,春季NO混合比与同纬度地区的纬圈平均相比其值更高,各个季节NO₂混合比的总体趋势都要比同纬度地区低;③在100,10 hPa和1 hPa上,NO_x混合比随时间变化的总体趋势是各不相同的;④NO_x具有准2 a周期变化;⑤在10 hPa附近,NO_x与O₃存在较明显的反相关关系.     

两类非连通图(P2∨Kn)（0，0,r1,0,…,0,rn)∪St(m)及(P2∨Kn)（r1+a,r2,0,…,0)∪Gr的优美性

 对自然数n, m, i∈N,设K_i表示i个顶点的完全图,K_n表示K_n的补图,St(m) 表示m+1个顶点的星形树,G_r为有r条边的优美图,P_n为n个节点的路,P₂∨K_n是P₂与K_n联图。 给出了非连通图(P₂∨K_n)（0,0,r₁,0,…,0,r_n)∪St(m)和(P₂∨K_n)（r₁+a,r₂,0,…,0)∪G_r的定义,并论证了当n≥2时,这两类图都是优美图。     

图的点可区别IE-全色数的一个上界

用概率方法研究图的点可区别IE-全色数的一个上界,得到:如果δ≥7且16Δ≤n≤Δ⁷/[32×10⁵(Δ+1)] +1, 则χ^ie_vt(G)≤16Δ ,这里n是G的阶,δ是G中点的最小度数,Δ是G中点的最大度数。       

汉代日食记录的可靠性分析--兼用日食对汉代历法的精度进行校验

通过细致的文献分析和研究,参考前人的已有工作并结合当代日食计算程序,逐条对两汉时期保留的日食记录的可靠性进行了系统的分析讨论,指出了前后<汉书>、前后<汉纪>、<通志>、<世史正纲>、<全上古三代秦汉三国六朝文>以及地方志等诸多文献中一些记录的错误情况,分析了一些错误的原因并予以修正.在此基础上指出,汉代在日食的观测和记录方面取得了非常大的进步.最后采用汉代历法家的思路,利用可靠日食记录对<三统历>、<四分历>的合朔推算精度进行了分析,发现<三统历>确实存在着明显的后天问题,并且在东汉初期变得非常严重,<四分历>虽然通过历元的调整暂时缓解了这个问题,但是由于该历法所取得朔望月长度并没有实质进步,所以,它并没有从根本上解决问题.     

一种含5-硝基间苯二甲酸和菲咯啉配体的铜（II）配合物的制备、表征及电化学性能

采用水热法合成了含混合配体的铜配合物[CuLPhen]n（HL=5-硝基间苯二甲酸,Phen=1,10-菲咯啉）,其结构由单晶X射线晶体学确定。标题化合物在单斜空间群P2₁/c中结晶。标题化合物的晶体数据：C₂₀H₁₁N₃CuO₆,Mr=106.57,a =10.6619（3）,b =12.5760（4）,c =13.0550（3）Å,α =90,β=95.463（3）,γ =90°,V =1742.50（9）ų,Z =4,T=293（2）K,Dc =1.726 g/cm³,μ（MoKα）=0.301 mm^-1,F（000）=51.0,R =0.0380,wR =0.07,GOF =1.026。当用作超级电容器电极材料时,所制备的配合物具有高比电容、良好的循环稳定性和优良的倍率性能。具体来说,在1 mol/L KOH溶液中,最大比电容可达到225 F/g。在5 a/g电流密度下,5000次循环后比电容保持率为67.31%。     

《<歧路灯>词语汇释》补遗

<歧路灯>是清李绿园用河南方言创作的一部长篇白活小说,书中记载了丰富的河南方言口语词汇,河南大学张生汉教授出版了阐释<歧路灯>方言词汇的专著<<歧路灯>词语汇释>,收词较完备,但小说中"古董"、"费气"、"厮跟"等词在今洛阳等地方言中仍频繁使用,张教授的专著中却并未收录,现试做补充.     

Bi2Se3纳米片生长及晶体管制备

本文通过化学气相沉积的方法,成功地在云母衬底上制备了高质量的Bi₂Se₃纳米片。通过湿法转移的技术,将纳米片转移到SiO₂衬底上。通过光刻技术,我们制备了基于单个Bi₂Se₃纳米片的晶体管,并通过施加底栅电压,对Bi₂Se₃纳米片晶体管进行了有效的调控。研究表明,当Bi₂Se₃纳米片与电极之间形成欧姆接触时,底栅的调控效果较好；而当Bi₂Se₃纳米片与电极之间形成肖特基接触时,底栅的调控效果较差。     

阳极氧化Ti-6Al-4V合金表面TiO2多孔膜的制备及研究

在一定浓度的H₂SO₄溶液中对Ti-6Al-4V合金表面进行阳极氧化处理,通过改变阳极氧化处理的电压、氧化时间和电解液浓度,研究了预处理工艺参数对钛合金表面形貌、物相、润湿性及粗糙度的影响.试验结果表明：钛合金经过阳极氧化处理后,表面出现了二氧化钛（TiO₂）纳米多孔结构,多孔氧化膜由锐钛矿型和金红石型TiO₂组成;在0.5 mol·L^-1 H₂SO₄溶液中,随着阳极氧化电压的增加,多孔膜的孔径逐渐增大,基体表面与模拟体液（SBF）的接触角明显降低,经120 V氧化处理的试样表面接触角由预处理前的52.8°降至16.9°左右,具有良好的润湿性;并且试样表面的粗糙度明显增加,在电压为120 V时粗糙度达到0.56 μm.在电压120 V时,随着阳极氧化时间或电解液浓度的增加,TiO₂多孔膜的含量和孔径尺寸逐渐增大,试样表面的润湿性和粗糙度也不断增加,在氧化时间10 min或电解液浓度0.5 mol·L^-1时达到最大,氧化时间大于10 min或电解液浓度高于0.5 mol·L^-1时,试样表面出现裂纹,多孔结构被破坏.     

文学德育思想研究

<文心雕龙>从"文以明道"的哲学高度和"文变染乎世情"的现实层面,论述了文学的德育功能;从文学"陶铸性情"、"顺美匡恶"和"社会教化"的作用等方面,论述了文学德育功能的具体发挥;从个体价值实现与服务社会政治、净化社会风气等方面论述了文学德育的目的,从而在继承传统儒家文教思想的基础上有所发展和创新,形成了独特的文学德育思想.     

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…     

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。     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.