掺Eu^2＋的卤磷酸盐的发光特性和内部能量传递

探讨Ｂａ＾２＋离子搀杂对（Ｃａ０．５Ｓｒ０．５）５（ＰＯ４）３Ｃｌ：Ｅｕ＾２＋和（Ｃａ０．４Ｓｒ０．６）５（ＰＯ４）３Ｃｌ：Ｅｕ＾２＋量子发光效率的影响，当用Ｂａ＾２＋离子代替Ｃａ＾２＋或Ｓｒ＾２＋离子进入晶体时，Ｅｕ＾２＋离子的发光特性发生改变；发射峰的峰值降低；热猝灭的温度升高，并采用位型坐村理论给予解释。根据晶体的结构特征，对占据两个不等当晶体学位置的Ｅｕ＾２＋离子发光中心之间的能量传递进行     

异核高氯酸（Eu^3＋,Er^3＋）二苯亚砜配合物中Er^3＋？…

合成了一系列异核（Ｅｕ１－ｘＥｒｘ）（ＤＰＳＯ）７（ＣｌＯ４）３（ｘ＝０．０００－０．２００,ＤＰＳＯ为二苯亚砜）配合物。对配合物进行了组成分析,ＩＲ谱及荧光激发和发射光谱的测定。荧光光谱测定结果表明：Ｅｕ＾３＋在配合物中所处格位对称性低无对称中心,本身不发光的Ｅｒ＾３＋对Ｅｕ＾３＋的发光有较大影响,随着Ｅｒ＾３＋浓度的增大,对Ｅｕ＾３＋的发光先敏化后猝灭。给出了在该体系中Ｅｒ＾３＋对Ｅｕ＾３＋发     

Eu^2＋激活的Li—β—Al2O3的组成,结构和发光

运用周期表对角线规则，获得了Ｅｕ＾２＋激活的Ｌｉ－β－Ａｌ２Ｏ３新的发光基质，研究了该基质的组成，结构，电荷补偿机制及Ｅｕ＾２＋在体系中的发光性质。结果表明：锂对ＢａＭｇＡｌ１０Ｏ１７基质中镁的取代仍然保持β－Ａｌ２Ｏ３结构不变，Ｌｉ－β－Ａｌ２Ｏ３基质中的电荷补偿主要是形成间隙Ａｌ６３＋或Ｌｉ＾＋离子机制，Ｅｕ＾２＋激活的Ｌｉ－β－Ａｌ２Ｏ３具有良好的发光性能，通过进一步研究有可能应用到三基色发     

高氯酸铕,六氟磷酸铕二苯亚砜及苯丁基亚砜配合物的荧…

合成了高氯酸铕二苯亚砜Ｅｕ（ＤＰＳＯ）７（ＣｌＯ４）３以及六氟磷酸铕二苯亚砜Ｅｕ（ＤＰＳＯ）７·（ＰＦ６）３及高氯酸铕苯丁基亚砜Ｅｕ（ＰＢＳＯ）７·（ＣｌＯ４）３配合物。从配合物的荧光激发和发射光谱可以看出：Ｅｕ＾３＋的发光系配体亚砜敏化所致。二苯亚砜配合物的发光强度高于苯丁基亚砜配合物。＾５Ｄ０→＾７Ｆ２谱带在二苯亚砜配合物中发生劈裂，且强度高于＾５Ｄｏ→＾７Ｆ１，这表明Ｅｕ＾３＋在二苯亚砜配合     

稀土离子（Eu^2＋和Gd^3＋）掺杂的钡镁复合氟化物的发光特性

本文报导了Ｇｄ＾３＋与Ｅｕ＾２＋共掺杂的钡镁复合氟化物在室温下的发射光谱中，不仅有Ｅｕ＾２＋的带状发射，而且还出现了Ｅｕ＾２＋的４ｒ（＾６Ｐ７／２－４ｒ（＾８Ｓ７／２）线谱发射。这是由于Ｇｄ＾３＋掺入后，使部分Ｅｕ＾２＋５的配位数由８增至１０，从而诱导出了Ｅｕ＾２＋的另一种发光中心，使得Ｅｕ＾２＋的线谱发射产生。     

铒浓度对ZnS薄膜DCEL的影响

用直接掺杂法和ＸＰＳ谱法研究ＺｎＳ：Ｃｕ，Ｃｌ，Ｅｒ中铒离子的体浓度及纵向分布对器件发光的影响，测量了Ｅｒ￣３＋的￣２Ｈ＿ｌｌ／ｌ２，跃迁与温度的关系，对硫化锌薄膜器件中Ｅｒ￣３＋发光的电激发过程提出新见解．     

铕—偶氮胂Ⅲ溶液相和树脂相配合物的研究及树脂导数光…

本文研究了Ｅｕ＾３＋－偶氮胂Ⅲ（ＡｒＳⅢ）配合物在溶液中和在离子树中的形成条件，给出了Ｅｕ＾３＋－ＡｒｓⅢ在溶液中和树脂中各自的吸收光谱，λｍａｘ液＝６５０．３ｎｍ，λｍａｘ树脂＝６６０ｎｍ，在大量硝酸盐存在下，Ｅｕ＾３＋－与ＮＯ３形成与Ｅｕ（ＮＯ３），该配阴离了与ＡｒｓⅢ显色后，能为强碱性阳离子交换树脂吸附，以ＮＯ３树脂吸附率高且保持恒定。对溶液相及树脂及相配合的组成研究表明，溶液相Ｅｕ：Ａｒｓ     

Al2O3-SiO2:Ln3+发光陶瓷的合成及发光行为

采用溶胶－凝胶法合成了Ａｌ２Ｏ３－ＳｉＯ２：Ｌｎ＾３＋（Ｌｎ＝Ｅｕ,Ｔｂ）发光陶瓷粉末,利用ＸＲＤ、ＴＧ－ＤＴＡ和ＩＲ等实验技术,研究了发光陶瓷的形成过程,并对其发光行为进行了研究。     

稀土与吡啶甜菜碱和2,2‘—联吡啶配合物的研究

合成了稀土土离子（Ｌａ＾３＋，Ｎｄ＾３＋，Ｅｕ＾３＋，Ｇｄ＾３＋，Ｔｂ＾３＋，Ｅｒ＾３＋）与吡啶乙酸内盐（Ｃ５Ｈ５Ｎ＾＋ＣＨ２ＣＯ＾－２，ｐｙｂ）及，２，２‘－联吡啶的三元配合物。通过元素分析，红外光谱等测试手术，确定配合物的组成为ＲＥ２（ｂｐｙ）５（ｐｙｂ）４（ＣｌＯ４）６．５Ｈ２Ｏ。测定了Ｅｕ＾３＋配合物的晶体结构，属三斜晶系。     

Al_2O_3: Eu~(3+),Tb~(3+)发光陶瓷的合成及发光行为

首次以异丙醇铝为原料,采用溶胶－凝胶法合成出了Ａｌ２Ｏ３Ｅｕ３＋,Ｔｂ３＋发光陶瓷粉末．利用ＸＲＤ和ＴＧ－ＤＴＡ等实验技术,研究了发光陶瓷的形成过程,找出了最佳合成条件．并对其发光行为进行了研究,在Ａｌ２Ｏ３Ｅｕ３＋,Ｔｂ３＋中观察到了Ｔｂ３＋→Ｅｕ３＋的能量传递．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

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.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

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

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the