数学建模与高校数学教育教学改革

把数学建模的思想和方法融入大学数学课程教学是培养学生应用数学知识去解决实际问题能力的一条有效途径,是当前大学数学课程改革的一个重要方向.本文首先阐明数学模型的思想的基本原则和基本方法,然后结合提学科教学的实际情况提出进行具体改革方法和措施.     

对在大学数学教学中渗透数学建模思想的研究

探讨在大学数学课程教学中渗透数学建模思想的必要性和基本原则,提出渗透数学建模思想的具体措施和建议,形成教学模块示例,是大学数学教学研究的必要课题.     

浅谈数学建模思想在数学分析教学中的渗透

把数学建模的思想方法融入数学分析课程教学是培养学生创新能力和实践能力的一条有效途径,是当前大学数学课程改革的一个重要方向.本文从数学分析教学的几个主要环节提出了渗透数学建模思想方法的一些见解.     

"三位一体"目标下的数学思想方法教学意识培养

新一轮基础教育数学课程改革，把在数学教学中培养学生的数学思想方法提高到十分显著的地位．笔者从基础教育数学课程“三位一体”的目标出发，探讨数学思想方法教学的意义．进而探索培养高师学生数学思想方法教学意识的方法与途径.     

浅谈在大学数学教学中渗透数学建模思想的途径

目前本科大学数学课程教学中存在不少问题,教学模式较单一,讲授知识点多,讲授数学知识的来源及与之关联之事少,教学缺乏直观性和应用性。解决这一问题的有效方法是在数学教学中渗透数学建模思想及建模方法,本文在教学实践的基础上,总结出在大学数学教学中渗透这一思想的有效途径。     

数学思想方法与课堂教学

《数学教学大纲》和《数学课程标准》都把数学思想方法纳入了基础知识的教学范围，这体现了我国“双基”教学与时俱进，体现了数学教学从初级水平向高级水平迈进，必将对素质教育的贯彻和数学素质的提高产生积极的影响．本文从数学思想方法的认识、中学数学中的基本数学思想方法、数学思想方法的教学策略三方面就如何在教学中渗透数学思想方法作了探讨．     

独立学院数学建模课程建设的探索——以吉林建筑工程学院城建学院为例

将数学建模的思想和方法融入大学数学课程,是大学数学课程改革的重要方面,独立学院也应从自身特点出发开展数学建模课程建设的探索与实践。文中针对独立学院在数学建模课程建设中存在的问题,从理论分析和实践探索两方面,探讨如何建立适合独立学院自身实际情况的数学建模课程和数学建模培训体系。     

文科大学数学教学改革之我见

为了提高学生的整体文化素质,很多文科专业开设了大学数学课程.针对教学目标,根据学生的具体情况,文科大学数学的教学应该进行科学地改革:定义简单直观化,数学思想侧重化,考试题型开放化.     

在数学教学中对学生渗透数学思想

《数学课程标准》强调：“通过数学学习,学生能够获得对未来社会生活和进一步发展所必需的重要数学知识以及基本的思想方法和必要的应用技能…‘教师应帮助学生‘掌握基本的数学知识与技能、数学思想和方法＇”。目前,对小学数学思想方法教学的研究较少。为了推进新课程的实施,提高小学数学教学质量,我们在小学数学教学中,对小学数学思想方法教学进行了积极的探索。     

独立学院文科数学教学对策的思考

随着改革的不断深入,文科类大学生也开始学习数学课程,文科数学已经成为了一门必修课,近几年对数学课程的要求还在不断提升。本文针对目前大学文科数学在实际教学中出现的问题以及要达到的学习目标,根据自身教学情况提出了一些相应的对策。     

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