高压下MTi2（PO4）3晶体Raman光谱研究

利用Ｒａｍａｎ光谱研究了ＭＴｉ２（ＰＯ４）３（Ｍ＝Ｌｉ，Ｎａ，Ｋ）晶体在高压下产生的压致结构相变。实验结果表明：ＬｉＴｉ２（ＰＯ４）３和ＫＴｉ２（ＰＯ４）３在３ＧＰａ和６ＧＰａ压力附近发生了两次压致结构相变；ＮａＴｉ２（ＰＯ４）３在２．５ＧＰａ和７．５ＧＰａ压力附近发生了两次压致结构相变。     

MPEG-2 DCT系数码表的优化

给出了一种优化ＭＰＥＧ－２ 的ＤＣＴ系数码表＿ ０／１ 的方法．其基本思路是：在ＥＯＢ码字后添加一个附加比特引入一个附加的ＦＬＣ码表,用此ＦＬＣ码表取代现有ＭＰＥＧ－２ 的ＤＣＴ 系数码表＿ ０／１ 中较长的ＶＬＣ码字．结果表明,此方法可在压缩性能及运算量两方面对ＤＣＴ系数码表＿ ０（ＰＳＮＲ＝ ２７～４０ ｄＢ）及ＤＣＴ系数码表－ １（ＰＳＮＲ＝ ３０～４０ ｄＢ）实现优化,ＰＳＮＲ值越高,优化效果越显著．     

凸度量空间上的一个不动点定理

设Ｘ为具有性质（Ｃ）和（Ｐ）的凸度量空间，Ｋ是Ｘ的非空凸子集，ＴＫ→２Ｘ使得ｘ→ｄ（ｘ，Ｔｘ）是１．ｓ．ｃ．若ｉｎｆ｛ｄ（ｘ，Ｔｘ）｜ｘ∈Ｋ｝＝０，且ｘ，ｙ∈Ｋ，λ∈［０，１］，ｕ＝Ｗ（ｘ，ｙ，λ）有ｄ（ｕ，Ｔｕ）≤Φ（ｍａｘ｛ｄ（ｘ，Ｔｘ），ｄ（ｙ，Ｔｙ）｝）．这里ΦＲ＋→Ｒ＋满足条件Φ（０）＝０，在０的右边不减和连续，则Ｔ在Ｋ上有不动点．它推广了Ｔ．Ｈ．Ｃｈａｎｇ和Ｃ．Ｌ．Ｙｅｎ（１９８９）在Ｂａｎａｃｈ空间中的结果     

（Y，Gd）_2O_3·2B_2O_3：Bi~（3＋），Eu~（3＋）的发光性质

研究了荧光材料（Ｙ，Ｇｄ）_２Ｏ_３·２Ｂ_２Ｏ_３：Ｂｉ~３＋，ＥＵ~３＋的合成和晶体结构．经ＸＲＤ确定为六方晶系，晶胞参数：ａ＝３．７８６，ｃ＝８．８２４．在２５４ｎｍ紫外光激发下，荧光材料有较强的红色发光．观察到Ｂｉ~３＋→Ｇｄ~３＋→Ｅｕ~３＋的能量传递现象，Ｂｉ~３＋→Ｇｄ~３＋能量传递机理为交换作用；Ｇｄ~３＋→Ｅｕ~３＋能量传递机理为电偶极──电四极相互作用．     

分层基法对差分方程的应用

设Ａｕ＝ｂ是二阶椭圆方程的差分逼近，熟知矩阵Ａ的条件数ｃｏｎｄ（Ａ）＝Ｏ（ｈ￣（－２））（ｈ→０）．将差分方程表为ＧＤＭ（广义差分法）形式，并利用分层基法将它化为等价方程Ｂｖ＝ｃ，使ｃｏｎｄ（Ｂ）＝Ｏ（（Ｉｇｈ￣（－１））￣２）．然后用某些迭比法（包括Ｒｉｃｈａｒｄｓｏｎ迭氏、共轭斜量法和Ｃｈｅｂｙｓｈｖ半迭代）解Ｂｖ＝ｃ。理论分析和数值试验证明有高敛速。     

Fe-Mn-Si形状记忆合金fc(γ)→hcp(ε)马氏体相变温度的热力学预报

借助于Ｆｅ－Ｍｎ－Ｓｉ合金层错几率Ｐｓｆ的Ｘ射线测量,计算了Ｐｓｆ与合金成分的关系,得到Ｆｅ－Ｍｎ－Ｓｉ三元系的１／Ｐｓｆ表达式．结合层错形核的热力学模型,经回归得Ｆｅ－Ｍｎ－Ｓｉ合金ｆｃ（γ）→ｈｃｐ（ε）马氏体相变的临界相变驱动力和Ｐｓｆ的关系式,进而得到临界相变驱动力与合金成分的关系．借助Ｐｓｆ建立了成分与相变驱动力之间的关系,结合有关热力学分析计算得到的Ｆｅ－Ｍｎ－Ｓｉ合金γ和ε两相Ｇｉｂｂｓ自由能曲线,预报了Ｆｅ－Ｍｎ－Ｓｉ三元系合金的ｆｃｃ（γ）→ｈｃｐ（ε）马氏体相变的温度．     

Chidume的公开问题及不动点定理

设Ｘ是一个实Ｂａｎａｃｈ空间,Ｘ是一致凸共轭空间,Ｋ是Ｘ的非空有界闭凸集．Ｔ：Ｋ→Ｋ是一强伪压缩映象．如果Ｆｉｘ（Ｔ）≠,则对任ｘ０∈Ｘ,Ｍａｎｎ迭代｛ｘｎ｝：ｘｎ＋１＝（１－αｎ）ｘｎ＋αｎＴｘｎ（ｎ≥０）强收敛于Ｔ的唯一不动点．其中αｎ∈（０,１）,∑＋∞ｎ＝０αｎ＝＋∞,αｎ→０（ｎ→＋∞）．还证明了另一个Ｉｓｈｉｋａｗａ迭代定理,这两个定理结果推广了Ｃｈｉｄｕｍｅ等人的工作．     

群作用下的分歧定理

在紧致李群Ｇ作用下的Ｂａｎａｃｈ空间Ｘ中,利用等变严格集压缩场的零点指标公式,讨论了Ｇ等变映射ｆ∈Ｃ１（Ｘ×Ｒ,Ｘ）在零点轨道Ｎ＝Ｇ（ｘ０）和管状邻域Ω上的分歧问题ｆ（ｘ,λ）＝ｘ－σ（ｘ）－λＡ（σ（ｘ））（ｘ－σ（ｘ））＋Ｒ（ｘ,λ）＝０,所得结论推广了Ｒａｂｉｎｏｗｉｔｚ的大范围分歧定理．其中σ：Ω→Ｎ是Ｇ等变投影,Ａ（ｘ０）是严格集压缩,Ｒ是高阶无穷小量．     

SmAlGe结构中的Al—Ge共价成键网络

用电弧熔炼法合成ＳｍＡｌＧｅ，以单晶Ｘ射线衍射法测定晶体结构．晶体学及结构修正参数：化学式ＳｍＡｌＧｅ，Ｍｒ＝２５０．０，正交晶系，ＬａＰｔＳｉ类型，（１０９）Ｉ４１ｍｄ，ａ＝０．４１９５７（３）ｎｍ，ｃ＝１．４５８８（２）ｎｍ，Ｖ＝０．２５６７９（４）ｎｍ３，Ｚ＝４，Ｄｘ＝６．４６４ｇ／ｃｍ３，μ＝３５．２７ｍｍ－１（λＭｏＫ＝０．０７１０７ｎｍ），Ｆ（０００）＝４２８，Ｔ＝２９６Ｋ，对于１２个最小二乘修正参数和１２０个独立可观察衍射点Ｒ＝０．０３０，ｗＲ＝０．０２５．此化合物中主要是Ａｌ－Ｇｅ的共价结合并形成三维网络，经典极限情况下结构式可写成Ｓｍ３＋Ａｌ２－Ｇｅ１－，可称为“ｍｅｔａｌｉｃＺｉｎｔｌｐｈａｓｅ＂．而ＹＡｌＧｅ中Ａｌ－Ｇｅ准二维网络为共价到金属结合过渡，几何堆积因素占了很重要地位．     

循环图带宽的上界

给出了连通循环图Ｇ＝Ｃｎ〈ｊ１,ｊ２,…,ｊｒ〉带宽Ｂ（Ｇ）的上界,即Ｂ（Ｇ）≤２ｊｒ,并研究得到了四度连通循环图Ｇ１＝Ｃｍ１ｍ２〈ｋ１ｍ１,ｋ２ｍ２〉的带宽Ｂ（Ｇ１）＝２ｍｉｎ（ｍ１,ｍ２）（ｍ１＝ｇｃｄ（ｍ１ｍ２,ｊ１）,ｍ２＝ｇｃｄ（ｍ１ｍ２,ｊ２））,及五度连通循环图Ｇ２＝Ｃｍ１ｍ２〈ｊ１,ｊ２,ｍ１ｍ２／２〉的带宽Ｂ（Ｇ２）＝４ｍｉｎ（ｍ１,ｍ２）（２ｍ１＝ｇｃｄ（ｍ１ｍ２,ｊ１）,２ｍ２＝ｇｃｄ（ｍ１ｍ２,ｊ２））．     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-