培养皿模型的Hopf分支分析

对单种群的培养皿模型做了合理的改动，直接以培养液的流量和初始浓度为新的培养皿模型的Ｈｏｐｆ分支参数，研究了它的Ｈｏｐｆ分支以及稳定性，使分析加清晰。     

以滞量为参数的二阶时滞微分方程的Hopf分支公式

本文考虑以滞量为参数的具有限时滞的一般形式的二阶微分方程的Ｈｏｐｆ分支问题，得到了该方程的Ｈｏｐｆ分支值分支方向，对有限时滞时ｒ使方程有周期解所能取得的不同数值的个数作了估计，然后运用上述结果及Ｈａｓｓａｒｄ“规范形”方法，对于具体的方程如Ｌｉｅｎａｒｄ方程进行讨论，给出其Ｈｏｐｆ分支公式，利用该公式，能判断分支出的周期解的稳定性并且得到了该周期解的近似估值。     

时滞Van der pol型方程的Hopf分支图

利用时滞Ｌｉｅｎａｒｄ方程的Ｈｏｐｆ分支公式,讨论了多参数时滞Ｖａｎ ｄｅｒ ｐｏｌ型方程的Ｈｏｐｆ分支,并给出了其在相应对数空间的Ｈｏｐｆ分支图。     

一类大熊猫—竹子三种群系统的Hopf分支

本文考虑由种群生态学引起的一类大熊猫和两种竹子三种群生态数学模型，利用中心流形定理及Ｈｏｐｆ分支理论讨论并证明了该系统的分支现象，给出了中心流形的表达式及小振幅空间周期解的稳定性。     

一类红松林种群数学模型的分支问题

对一类具有鼠类作用的三维非线性红松林种群的数学模型讨论了鞍结分支，且对Ｈｏｐｆ分支周期解进行了详细的分析与计算。     

以滞量为参数的 Vanderpol型方程的 Hopf分支

本文以滞量为参数讨论了时滞 Ｖａｎ ｄｅｒ ｐｏｌ型方程的 Ｈｏｐｆ分支情况。     

Hopf代数同态的Hopf核

该文主要是讨论了Ｈｏｐｆ代数同态的左（右）Ｈｏｐｆ核的一些性质，而且还引入了Ｈｏｐｆ代数同态序列的定义．与此同时又给出了一个有限维Ｈｏｐｆ代数的Ｈｏｐｆ同态序列正合的充要条件。     

高维动力系统Hopf分岔点的确定

Ｒｏｕｔｈ—Ｈｕｒｗｉｔｚ判别法对于低维动力系统Ｈｏｐｆ分岔点的分析是方便的，但对高维动力系统的讨论是相当复杂．作者通过直接应用Ｈｏｐｆ分岔定理．得到了Ｈｏｐｆ分岔点满足的一般性参数方程．     

一类捕食者有投放率系统的定性分析

讨论了捕食种带有常数投放率的一类捕食－被捕食系统，分析了平衡点的分布与局部性态，得到了解的有界性与全局渐近稳定性的条件，以及极限环的存在性条件。最后用李雅普略夫方法讨论了Ｈｏｐｆ分支现象，同时，对结论给于生态解释。     

一类具时滞反应罐方程的Hopf分支

通过引进微生物的成熟期作时滞，给出反应罐的新模型，并给出此新模型的Ｈｏｐｆ分支的分析。     

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