计算机仿真实验在化学实验教学中的应用

介绍了计算机仿真化学实验，并对计算机仿真实验在化学实验教学中的应用进行了论述。     

计算机仿真实验教学的探索

调研了部分高校计算机仿真实验教学的开展情况,在建立计算机多媒体教育和购入计算机仿真实验软件的基础上,开设了物理仿真实验课,进行计算机仿真实验教学的实践和探索。     

计算机仿真实验平台的建设

本文根据高校实验教学的现状，提出将计算机仿真技术应用到大学物理、化学等相关课程的实验教学中，并把这些仿真实验软件综合到一个基于校园网的计算机仿真实验平台上。对计算机仿真实验平台的结构、功能、设计原则和实现措施进行了探讨。     

伯努利方程教学实验与数值仿真应用

实际物理实验与计算机技术应用紧密结合是力学实验教学模式改革和创新发展的趋势,对实验的计算机数值仿真是不同于计算机虚拟仿真的另一种实验教学辅助方法。以圆管稳定粘性总流伯努利方程教学实验为研究对象,较全面地说明了实验及归纳和分析实验测量数据及其变化规律。应用FLUENT流体软件,对实验的实际粘性流场进行计算机数值仿真分析。通过实际实验和计算机数值仿真相结合,从总水流测量到流场分布全面分析流动数据,使学生能够更加牢固掌握实验原理和深入理解有关概念,增强创新实践能力。     

基于GUI的可视化光学实验的仿真

随着计算机运算性能的快速提高,以及仿真软件的功能越来越强大,光学实验仿真在优化光学系统和模拟设计的过程中迅速发展起来,仿真系统引起了人们广泛的关注.本课题利用Matlab软件对经典的光学实验进行数学建模,编程运算,然后对实验进行计算机仿真,最后创建人机交互式GUI界面.使用者只需通过改变输入参数就可以模拟不同条件下的不同光学实验的实验现象.最终成果是设计完成一个实用的光学实验仿真平台.     

虚拟实验在高校教学中的应用

随着计算机技术和仿真技术的高速发展,虚拟仿真实验技术在教学中迅速崛起。虚拟仿真实验是在教学中利用计算机仿真技术,在计算机上教授和学习计算机组成原理、单片机原理、接口技术等课程,并在电脑上进行电路设计、调试、仿真等通常在实验室完成的实验。计算机、仿真软件,再加上实验教程,就可相当于一个设备先进的实验室。以软件代硬件、以虚代实,即为虚拟实验室的本质。     

计算机仿真实验引入概率统计教学初探

本文把计算机仿真实验引入到概率论与数理统计教学,活跃课堂气氛,提高学生学习兴趣。具体通过两种方式来实现,一：教师展示计算机仿真实验程序,二：教师引导学生自己编计算机仿真实验程序解决实际问题。     

计算机仿真在电子电路实验中的应用

计算机仿真技术在电子电路实验中的应用 ,即是电路仿真技术 ,它是基于元件模型和电路模型程序化的一种计算机仿真技术。在传统的电子电路实验中 ,详尽的实验讲义指导着实验的每一步骤 ,学生认真、谨慎的操作必然获得预期的实验数据 ,从而达到对理论学习的指导。由于实验设备条件、器材的消耗、实验室的管理等限制 ,仅仅验证性的实验使得学生缺乏主动思考、创造性思维和对实验反证性的研究。这样 ,培养的学生实验能力较弱 ,往往是眼高手低。一、计算机仿真的主要技术电子电路计算机仿真系统最主要的技术手段是利用仿真软件对要进行实验的电路…     

计算机总线实验的设计及实现

文章主要探讨计算机总线实验在计算机组成原理课程中的作用以及总线实验内容的选择与实验步骤,提供了用软件仿真方式进行计算机总线实验设计的具体过程、实验故障分析与定位的技巧以及竞争——冒险现象的分析与解决方法。     

计算机总线实验的设计及实现

文章主要探讨计算机总线实验在计算机组成原理课程中的作用以及总线实验内容的选择与实验步骤,提供了用软件仿真方式进行计算机总线实验设计的具体过程、实验故障分析与定位的技巧以及竞争——冒险现象的分析与解决方法。     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the