完整系统的能量方程及其积分

由完整系统所遵循的能量方程，不仅能导出保守系统在拉格朗日函数不显含时间ｔ的广义能量积分，而且对于一般系统在其拉格朗日函数里含时间ｔ的情况下，同样有可能得到一个广义能量积分．     

自旋动力学模拟的经典理论

给出磁性体系的哈密顿量,就可以从体系的拉格朗日运动方程出发,推导出体系自旋的经典运动方程,然后加入耗散项得到自旋动力学模拟的方程,进行迭代体系就能自动走到能量极小值的状态。     

自旋动力学模拟的经典理论

给出磁性体系的哈密顿量,就可以从体系的拉格朗日运动方程出发,推导出体系自旋的经典运动方程,然后加入耗散项得到自旋动力学模拟的方程,进行迭代体系就能自动走到能量极小值的状态。     

相对运动拉格朗日方程与正则方程

本文给出了相对运动第二类拉格朗日方程,引进了惯性力广义势u,通过广义势u将惯性力及其广义力表示出来。在此基础上导出了相对运动拉格朗日方程的另两种形式,从新导出的拉格朗日方程出发,进行勒襄德变换得到相对运动正则方程。进一步的分析得到相对运动的能量积分及机械能守恒定律。     

基于最优环流的MMC直流侧功率稳定控制策略研究

在基于模块化多电平换流器的柔性直流输电系统(MMC-HVDC)中,交流侧网压不平衡会引起MMC直流侧功率振荡,不利于系统的稳定运行,为此,提出一种基于最优环流的直流侧功率稳定控制策略.首先,依据拉格朗日乘数法,以环流为变量,建立起以桥臂能量和直流侧功率为硬性约束条件的拉格朗日方程;其次,通过求解该方程,直接在abc坐标...     

由拉格朗日函数讨论力学中的守恒定律

由保守系的拉格朗日方程可以得到守恒定律．时间和空间的对称性决定了系统的拉格朗日函数的改变量为零，由此可以推出相应的守恒定律．     

拉格朗日能量积分的应用

一、拉格朗日能量积分由完整、理想、保守的拉格朗日方程有以 _α乘上式求和有设力学组的绝对动能T=T_2+T_1+T_0其中分别为广义速度的二次、一次及零次式动能项,故由欧拉二次式定理有     

关于磁Appell函数的三阶拉格朗日方程

三阶拉格朗日方程可以用来描述电流猝变运动.该文将磁Appell函数替代加速度能量,得到了关于磁Appell函数的三阶拉格朗日方程,然后用它求得了一种RL电路暂态过程的电流急动度函数.     

多刚体系统动力求解的矩阵变换方法

该文提出了求解多刚体系统动力学问题的矩阵变换法,是由带不定乘子的拉格朗日方程为基础推导得到的,其中不含拉格朗日不定乘子和约束反力。利用该方法,可根据无耦合单刚体的动力学参数和系统的速度变换矩阵通过矩阵运算获得多刚体系统的动力学方程。该方法主要面向计算机实现程式化的算法,系统动力方程可由计算机自动生成。文末给出了一个多刚体系统动力求解的例子。     

分析力学中的相对运动微分方程

从非惯性系动力学方程出发，导出了力学体系在非惯性系中的Lagrange方程、Nielsen方程和Appell方程以及广义动量积分和能量积分，并举例说明它们的具体应用。     

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。     

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.     

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

正~~     

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