开环多刚体系统的四元数动力学方程

建立了开环多刚体系统的四元数动力学方程，以滑移矢量和相对转动四元数为广义坐标，并运用广义达朗贝尔原理及广义虚功原理建立的这一动力学方程消除了奇点，便于数值计算。以一无约束的空间２刚体系验证了四元数多刚体系统动力学方程的正确性和适用性。     

受非完整约束多刚体系统的广义动静法方程

将多刚体系统所受的完整及非完整约束作为速度空间中的嵌入流形，给出了受完整和非完整约束多刚体系统的广义动静法方程，讨论了一个平面开链机械臂动力学方程的建立过程．     

刚体-柔性梁系统的撞击动力学分析

该文研究了刚体-柔性梁系统作大范围旋转运动时的撞击动力学问题。采用子系统法建立了考虑“动力刚化”效应的系统刚柔耦合动力学方程，并采用假设模态描述变形，将偏微分形式的动力学方程转化为常微分方程。基于系统的动力学方程导出撞击时系统的广义冲量-动量方程，与撞击恢复系数方程相结合求出撞击动力学响应。文中给出了算例，验证了该文方法，并对大范围旋转运动下的刚体-柔性梁系统的动力学进行了探讨。     

受非完整约束多刚体系统的动力学方程

本文利用速度空间的概念，将多刚体系统所受的完整和非完、整约束作为速度空间中的嵌入流形，由Ｊｏｕｒｄｉａｎ原理导出了以流形曲线坐标表示的受完整和非完整约束多刚体系统的动力学方程，并利用本文结果讨论了一个平面开链机械臂动力学方程的建立过程。     

刚体系统动力学的一种方程

首先建立两个概念－刚体系统的基准速度与速度系数，导出关于速度系数的几个关系式，然后从牛顿第二定律出发导出刚体系统动力学的一种方程，本方程可方便地求解单自由度和多自由度刚体系统动力学问题及静力学问题。     

弯曲时空中平面运动刚体的动力学协变方程

研究了弯曲时空中平面运动刚体的动力学协变方程.给出了Minkowski时空中平面运动刚体动力学方程的协变形式.利用间隔是广义坐标变换下的不变量,得到弯曲时空中任一点运动标准钟与坐标钟的关系,建立了弯曲时空中平面运动刚体动力学方程的广义协变形式,并对其结果进行了讨论.     

平面运动物体的相对论四维协变方程

研究弯曲时空中平面运动刚体的动力学协变方程.给出Minkowski时空中平面运动刚体动力学方程的协变形式,利用间隔是广义坐标变换下的不变量,得到弯曲时空中任一点运动标准钟与坐标钟的关系,建立弯曲时空中平面运动刚体动力学方程的广义协变形式.     

系泊多浮体系统波浪运动响应的动力学分析

首先介绍了用势流理论和刚体动力学方程 ,分析系泊单浮体波浪运动响应的频域理论。对于铰联结系泊多浮体系统 ,将其作为铰联结无根树系统 ,用多刚体力学 Huston方法进行了运动学分析。选定广义速率后用其表达出多浮体系统的各种有关运动量。进而使用多刚体力学的 Kane方程 ,并补充以必要的运动学约束关系 ,导出了求解系泊多浮体系统各浮体质心位移和摇荡角位移的动力学方程组。最后归结为可求解各项位移、角位移幅值和相位的复数线性代数方程组。     

含闭合链的多刚体系统的动力学分析

该文详细研究了含有闭合链的复杂多刚体系统的动力学问题，建立了Ｌ－Ｅ法形式的动力学方程，并且运用奇异值分解法对其进行了缩并求解。该文的工作丰富了多刚体系统动力学建模理论和方法。     

考虑"动力刚化"的刚柔耦合多体系统动力学建模的子系统法

该文以转动刚体和其上固结的柔性梁组成的刚柔耦合系统为对象，利用子系统法研究了该系统的动力学问题并建立了耦合的动力学方程，此动力学方程考虑了“动力刚体”项。该文所提供的子系统法具有建模效率高，系统方程耦合度低等优点。文末给出的算例说明了方法的正确性。     

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.     

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.     

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。     

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.     

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

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