跳跃机器人浮动基动力学模型及试验

研究了平面腿型跳跃机器人浮动基动力学模型的建立、仿真及试验问题.将跳跃机器人模型抽象成由三根均质连杆组成的平面跳跃机构,建立3个坐标系研究跳跃运动的变约束性.分别对支撑相和腾空相的运动模型进行分析,建立了Lagrange动力学方程.由于支撑相足尖与地面满足Pfaffian约束,因此将机器人足尖平移坐标与关节变量统一作为广义坐标,建立显含力约束的跳跃机器人浮动基动力学模型.确定跳跃运动约束方程和相互识别条件.通过仿真和样机试验说明了跳跃机器人浮动基动力学模型的正确性.     

振动方程耦合类型的注记

采用动静法建立振动系统动力学方程，通过具体例子的讨论和一般情形的分析，论证了振动方程的耦合类型与系统广义坐标选取无关.     

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。     

开环多刚体系统的四无数动力学方程

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刚体系验证了四无数多刚体系统动力学方程的正确性和适用性。     

完整系统动力学方程的研究

借助广义坐标、不计算广义力，从能量和功率观点建立完整系统动力学方程的一种形式，为解决多自由度系统动力学问题提出简捷解法。对于相当广泛的一类系统，这种方法与传统的Ｌａｇｒａｎｇｅ方程比较，物理意义更为明显，计算简捷。     

非完整系统动力学方程的研究

借助于广义坐标、能量和广义功率的观点建立非完整系统动力学方程的一种形式。     

一种自主研磨作业机器人动力学仿真

研究了一种由直角坐标机构、转动机构和摆动机构构成的自主研磨作业机器人的运动学和动力学分析,以支链构件相对坐标和动平台绝对坐标作为广义坐标,结合Lagrange方法建立了运动学和动力学模型,并利用Matlab软件平台进行了运动学及动力学仿真,仿真结果说明了该模型的正确性与实效性,进而为自主作业机器人的轨迹规划及控制研究提供参考。     

挠性机器人机构动力学方程的建立

本文导出了一般开链挠性机器人机构动力学方程。它是由关节广义坐标和杆件模态坐标联立的非线性微分方程组。对于一般形状的杆件,采用有限元离散化,将节点物理坐标转换到模态坐标,利用弹性模态的正交性简化计算,给出了广义惯性阵元素的显式表达式。对方程进行了讨论和简化。     

柔性传动系统动力学数学模型的转化

对三种较为典型的柔性传动系统，先用拉格朗日方程建立动力学数学模型，再选取适当的广义坐标，通过线性变换，得到各集中质量位于同一轴线的等效模型，从而使原模型向实际典型的三类柔性传动系统转化，得到相应柔性传动系统三种动力学数学模型。     

仿蛙机器人起跳阶段动力学及仿真分析

针对弹跳机器人高驱动功率的要求,设计了一种含有弹簧储能机构的间歇式跳跃仿蛙机器人。为了分析机器人在弹簧储能机构驱动下的起跳运动规律,对机器人起跳阶段的动力学进行了研究。首先建立了简化的机器人机构模型,并采用D-H方法建立了机器人起跳阶段的位置、速度和加速度方程;然后根据多刚体动力学拉格朗日方法推导了机器人起跳阶段的动力学方程,并利用MATLAB对拉格朗日方程进行数值求解,得到了机器人起跳阶段的关节角度变化规律、质心运动轨迹和起跳完成时刻质心速度。最后利用ADAMS进行了起跳阶段的动力学仿真,验证了动力学方程数值求解结果的有效性。     

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.     

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)

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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