基于虚拟样机技术的机械原理课程设计教学探索

分析了传统机械原理课程设计存在的问题,通过实例阐明在课程设计中通过运用ADAMS软件对机构进行运动学和动力学分析,将先进的计算机技术应用于传统的教学中,更新了设计手段,提高了课程设计水平,保证了教学效果,使学生的创新和动手能力得到了锻炼.     

基于虚拟样机技术的机械原理课程设计教学探索

分析了传统机械原理课程设计存在的问题，通过实例阐明在课程设计中通过运用ADAMS软件对机构进行运动学和动力学分析，将先进的计算机技术应用于传统的教学中，更新了设计手段，提高了课程设计水平，保证了教学效果，使学生的创新和动手能力得到了锻炼．     

ADAMS在机械系统仿真技术教学中的应用

针对机械系统仿真技术课程内容抽象、涉及的数学基础较多、学生不易掌握、授课难度大的特点,研究了把ADAMS仿真软件引入课程教学的可行性.首先介绍了机械系统动态仿真所需要的基础理论,接着介绍了ADAMS软件算法基本理论及功能模块,最后在ADAMS软件中建立机械系统模型并进行仿真和结果输出.教学实践证明这种教学方法能够激发学生的学习兴趣、加深学生对课程的理解,从而提高了教学质量.     

RecurDyn在机械原理教学中的应用研究

文章利用RecurDyn建立实体模型,进行机械动力学仿真分析,解决机械原理课程传统教学中的不足,激发了学生的兴趣,提高了教学效果.同时启发学生利用计算机辅助设计与分析解决实际工程中的问题,提高了学生的创新能力.     

常用工程软件在机械原理中应用的教学改革

ADAMS、Matlab、AutoCAD与Solidworks是四种当前常用的工程类软件,这些软件具有建模直观形象、学生上手快、结果准确等特点。针对机械原理课程中机构运动学和动力学分析教学的常用方法的不足,本项目拟通过在教学中引入这四类软件设计一些题目或案例,进行分析求解、编制程序、制作动画,并研究完善工程软件在教学中具体的实施方案,引导学生进行研究性学习,可丰富课堂内容,激发学生的学习兴趣,提高学生学习的主动性及培养学生的创新意识。     

基于Matlab仿真的自动控制原理教学改革研究

阐述了Matlab的功能与特点,对Matlab仿真技术在自动控制原理课程教学中的应用进行了探讨,并通过具体的教学实例说明了该教学方法在教学效果和教学效率上的优势,验证了Matlab软件对自动控制原理传统教学改革的促进作用。     

计算软件在结构动力学教学中的应用

针对传统教学方法在结构动力学教学中的不足,提出把结构力学求解器、Matlab和Simulink软件、有限元软件ANSYS等计算软件应用于结构动力学的教学实践中,可以帮助学生理解结构动力学的基本概念和基本理论,提高教学质量和效果。     

基于工程教育教学改革研究与探索——以《机械原理》课程为例

针对机械原理课程在教学改革中面临的问题,研讨了机械原理的教学方法,用反推法、多媒体、启发式、互动式、综合性教学等方法来培养学生的创新思维,提高学生的工程意识.实践证明,机械原理课程教学改革为地方产业发展培养和提供合格的工程人才起到了良好的效果.     

ADAMS和Matlab交互仿真的机械臂定位控制

运用虚拟样机软件ADAMS和数值计算软件Matlab建立交互式仿真系统，并采用比例微分控制法（proportional derivatiVe，简称PD）对二阶机械臂进行定位控制模拟。实验证明，使用ADAMS和Matlab交互式仿真系统将机械系统动力学建模和控制系统分离，可以避免传统机械控制的复杂性，为机械系统控制研究提供了方便。     

基于ADAMS的单侧自卸式矿车曲轨优化设计

首先对常用矿车进行了介绍,并对单侧自卸式矿车的工作原理进行了分析,找到了现有矿车卸载时的不足,然后在分析的基础上得到了较为合理的曲轨卸载曲线,并同时对矿车卸载时进行了稳定性校核,最后采用机械动力学软件ADAMS进行仿真验证.     

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