物理定律“纵横向”

物理学是以实验为基础的一门学科,其整个体系完全建立在实验规律(即物理定律)之上,因此对物理定律的正确理解是学好物理学的一个关键。在中学物理教学中,有一种不好的倾向,就是只要求学生死记硬背物理定律,而忽视了对定律中各量的含义和量与量之间的因果关系的分析,适用范围与条件的阐述。结果,使学生误把物理定律当作     

数量级概念在物理学中的地位

以实验为基础的物理学的每一定律被推到极端的情况，将被发现是统计的和近似的，而不是数学上完善的和精确的。本文具体讨论了力学守恒定律与时空对称性之间的关系。旨在说明力学守恒定律与体系的性有着密切的联系。在物理学中的对称性，事实上意味着某种基本量不可观测。如果人们原来认为是不可观测量被后来证实是可观测量，则相应的性被破坏，相应的衬恒定律随之不能成立。由此进一步说明牧师量的数量级界限，规定着要应物理规律的     

关于中学物理规律与教学方法的探讨

物理学可分为力学、热学和分子物理学、电磁学、光学、原子物理等学科。每一部分又都包含物理实验、物理概念、物理规律、物理习题、科学和生产技术的物理原理。物理概念和物理规律构成中学物理基础理论知识。在中学物理教学中,如何探讨和研究物理知识的特征和规律,使学生能够很好地掌握物理知识,成为中学物理教学的重要任务。回物理规律的实践性物理学是一门以实验为基础的学科。中学物理的众多规律都是在实践、实验的基础上升华为理论,因此在学习规律与在应用规律分析实际问题时,应充分注意规律的实践性,寻求理论与实际的切合点。例…     

对分布函数最概然量间关系的分析

统计物理学中系统有各种不同的分布,有些也可以求出各种最概然量。本文对分布函数最概然量间的关系进行了分析,指出了统计间隔变换对最概然量间关系的影响,得到了最概然速率、最概然动量和最概然动能间满足的规律。     

物理生物学 从原子到医学

物理生物学（Physical Biology）是一门新兴的前沿交叉学科。与生物物理学（Biophysics）侧重于研究生命物质的基本物理规律不同,物理生物学主要利用新近发展起来的物理学先进概念和技术,精确地测量和描述生物系统的结构、功能和行为,使生物学建立在定量的物理学基础之上。物理生物学常用的研究手段包括超快电子束衍射技术、微流控技术、单分子光谱技术等;研究对象涵盖了原子、小分子、     

数学方法在物理学研究中的运用

文章通过介绍数学方法为物理学研究提供简明精确的形式化语言、数量分析、计算方法和逻辑推理等内容。提出了在物理学研究中把数学形式与物理规律、物理图像等紧密联系起来,达到提高学生分析、解决物理学问题的能力,为开启从事物理学工作的教师探索性思维、创造性研究提供参考。     

试论最小作用量原理

试论最小作用量原理刘继东科学的真正光荣，在于用一种共同的原理揭示物理学的规律，最小作用量原理正是这样一种统一的原理。自然界是一个丰富多采、变幻无穷的世界。从物理学者的观点看，各种事物以力、热、电、光等规律运动，这些规律是否能服从一个统一的规律呢？另一...     

赝螺旋定理(摘要)

《螺旋》是一个由矢量■和该矢量的矩■组成的矢量偶来表述的物理量。在物理学中,具有■对应关系的物理量是相当多的(如力和力矩,动量和动量矩等),他们都可以使用螺旋表述。然而在物理学中还有另外一种不具有■对应关系的量(如任意两矢量的矢量积■),由这种非对应量表述的运动规律遍及物理学各个领域,能否对这些非■对应的量使用螺旋表述已成为《螺旋动力学》体系能否最终建成的关键所在。本文专题介绍赝螺旋定理,该定理给出了非对应量使用螺     

分析力学对社会科学的应用

本文探索分析力学新的应用方向和领域.在简单介绍物理学和力学在社会科学领域的若干应用,介绍社会物理学和经济物理学以后,指出根据分析力学的特点和优势应当将它运用于社会科学,特别是经济学的研究,并且具体讨论了某些分析力学概念、规律和方法应用的可能性.最后,提出了在探索过程中应解决的三个问题.     

矗立在20世纪之初的科学丰碑

20世纪之初,诞生了相对论和量子力学,人们称为近代物理学.近代物理学彻底改变了经典物理学的世界观,这主要表现在时空结构、刚性概念和因果律三个方面.物理学的规律是人类思想的自由创造;反之,物理学又使人类思想发生了革命.     

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.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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