一类对偶平坦的Finsler度量（英文）

Finsler几何是没有二次型限制的黎曼几何,在Finsler几何中很重要的两个问题是射影平坦和对偶平坦的Finsler度量.本文主要研究了一类含有3个参数的Finsler度量F=α+β,其中α(x,y)=(k~2(x,y)~2)+ε|y|~2(1+ζ|x|~2))~(1/2)/(1+ζ|x|~2)和β(x,y)=(kx,y)/(1+ζ|x|~2).利用Hamel方程和对偶平坦方程,得到了这类Finsler度量为射影平坦和对偶平坦的充要条件.     

复Finsler流形上的两个问题

类似于实Finsler流形,在复流形的全纯切丛上引进Finsler度量F,并且定义G=F2为垂直丛上一Hermitian度量,然后利用Hermitian一些技巧得到复Finsler流形上的一些几何性质.在此基础上讨论了复流形M上给定的两个弱Khler复Finsler度量,如果它们射影等价则必仿射等价,以及流形M上赋予由复Berwald流形上复Finsler度量诱导的实Finsler度量必为实Berwald流形.     

芬斯拉度量的正齐次提升

本文以最一般的方式定义了流形M上Finsler度量g在T(M)上的提升-↑g，又引进对一般的Finsler联络FΓ而言的应变张量场S，并证明了它的所有N-分解因子全是正齐次的。     

Cartan联络及复（α，β）度量

设F：T^1,0M→R＊为复流形M上的强凸复Finsler度量,一般的由F＊诱导的Cartan联络及由F诱导的Chern-Finsler联络是不同的,主要在垂直丛上对这两种联络进行了比较;复（α,β）度量F=αφ（｜β｜/α）是较为重要的复Finsler度量,其中α^2=αif dz^i dz^j为M上的Hermitian度量,β=bi（z）dz^i为Ｍ上的（1,0）形式。计算了由F诱导的非线性联络系数Гiβ^α。     

局部对偶平坦的指数Finsler度量

研究了形如F=αexp(β/α)+εβ的指数Finsler度量,并给出了它为局部对偶平坦度量的条件,其中α是Riemann度量,β为1-形式,ε为常数.     

反正切Finsler度量与Kropina度量射影等价的充要条件

考虑反正切Finsler度量F=α+εβ+βarctan(β/α)和Kropina度量F=α2/β的射影等价,其中:α和α为流形M的Riemann度量;β和β为流形M非零的1-形式.利用射影等价具有相同Douglas曲率的性质,得到了这两个度量射影等价的充要条件.     

一类与Funk度量射影相关的Finsler度量具有两种常曲率的条件

Funk度量F是一个射影平坦的Finsler度量，它具有常曲率K＝-1/4和常S－曲率S＝1／2（n 1)F,首先在欧氏空间R^n的一个强凸区域Ω上用Funk度量F和闭1－形式β构造了一类新的Finsler度量－／F＝F＋β，然后分别找到了－／F具有常曲率和常S－曲率的充分必要条件。     

无爪图的周长

设 G为 n阶 2连通无爪图,δ=min{d(x)|x∈V(G)},δ~*=min{max(d(x),d(y))|x.y∈V(G).d(x.y)=3},则(i)c(G)≥min{n.2δ~*+4};(ii)当 δ~*≥(1/2)(n-δ-2)时 G是哈密顿图。     

Finsler空间的射影对应

Rapcsak,A.从度量函数F(x,x)出发,研究了两个Finsler空间的射影对应。作者从度量张量g1,(x,x)入手探讨了两个Finsler空间的射影对应,证明两个n维Finsler空间(F_n,gii)与(F_n,g_i,)成射影对应的一个充要条件是存在一个关于x′是     

一类具有弱射影Ricci曲率的Spray及其可度量化问题

【目的】Spray的曲率性质及其可度量化问题在Spray几何中是很重要的,因此对一类由Funk度量Θ构造的射影平坦的Spray G～(其测地系数为G～i=τΘyi,其中τ是常数)进行研究。【方法】计算G～的射影Ricci曲率,进而在一定射影Ricci曲率条件下研究这类Spray的可度量化问题。【结果】1)在G～是射影Ricci-平坦的条件下,确定了流形的体积形式;2)在G～可由芬斯勒度量F～诱导的前提下,若F～具有弱射影Ricci曲率且是非射影Ricci-平坦的,则F～的结构可被确定。【结论】初步分类了具有弱射影Ricci曲率的芬斯勒度量F～。     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

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。     

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

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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     

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