聚焦动量守恒与能量守恒

动量守恒与能量守恒是近几年高考理科综合物理命题的重点、热点和焦点，也是广大考生普遍感到棘手的难点之一．动量守恒与能量守恒贯穿于整个高中物理学习的始终，是联系各部分知识的主线．它不仅为解决力学问题开辟了两条新的重要途径，同时也为我们分析问题和解决问题提供了重要依据．     

巧用能量守恒 简化解题过程

能的转化和守恒定律是自然界最基本、最普遍的规律．这个定律告诉我们，各种不同形式的能是可以互相转化，而总能量保持不变．也就是说，某种形式的能量减少了．必有其它形式的能量增加了，而且减少的数量和增加的数量总是相等的．     

太极图与能量守恒和转化定律

太极图是《周易》的本源,它高度抽象概括了易的本质。太极图中黑白环弧的变化,实质是中国古代对能量守恒和转化定律的一种表述。     

以方法论培养为目标的传热学教学中的两个重要概念

传热学是一门理论性很强的专业基础课。为加强教学效果和培养学生的方法论,在教学过程中,特别重视能量守恒和热阻两个重要的基本概念。能量守恒是传热学的理论基础,对于建立微分方程以及计算传热问题都是十分关键的。而热阻以及温差除热阻就是传热量的概念对于简化传热的计算则很有帮助。在教学过程中,要准确地讲授这两个重要的基础概念。     

电磁感应中的热量计算

当闭合电路的部分导体在磁场中做切割磁感线运动时，闭合电路中有电流产生，通电导体受到安培力作用，安培力对导体做功，有电能和其它形式能的转化．如在纯电阻电路中电能全部转化为电阻的内能，即放出焦耳热，整个过程中能量守恒．本文就有关问题进行阐述，供参考．     

谈高考中弹簧连物体的平衡问题

弹簧连物体问题是典型的力学模型，它可以联系运动学，动力学和能量守恒等物理概念和规律，综合考查学生分析、解决问题的能力．以它设置的命题既熟悉，而又新颖，所以倍受高考命题者的亲睐．本文就与弹簧弹力有关的平衡问题为例，按弹簧放置分类，研究解题规律。     

Structural dynamic responses analysis applying differential quadrature method

INTRODUCTION The differential quadrature method (DQM) was proposed by Bellman and Casti as an analogous ex- tension of the quadrature method for integrals (Bellman and Casti, 1971; Bellman et al., 1972). It can be essentially expressed as the values of the de- rivatives at each grid point as weighted linear sums approximately of the function values at all grid points within the domain under consideration. As a distinct numerical solution technique to obtain the initial and/or boundary …     

传统处理中的两个问题

关于滑动摩擦力作功问题,梁昆淼教授在本刊1986年第12期发表了《动能定理与热力学第一定律》一文,文中写出了他对滑动摩擦力作功的“比较传统的处理”。我们感到,这种传统的处理存在两个问题。为明确起见,我们在这里将梁文的这一部分全文抄出,再指出其中的问题,梁文的这一部分如下:     

拉普拉氏变换的应用

一个物理量,不论是热学量还是电磁量,只要它与时间和坐标的关系满足(e)2u/(e)x-1/k(e)u/(e)t=0,这一物理量就按热量流动形式传导,应用拉普拉氏变换求解这一类方程,不需要用定解条件定解,省却了将边界条件齐次化的步骤,与分离变量法比较实用性更强.     

Philosophy of Mind： A Jain Perspective

Dualism is one of the views concerning the nature of mind. Arguments have been forwarded for and against dualism. Western philosophy lacks a clear distinction between soul and mind. Closely related to the concept of mind is the question of consciousness, a clear view of which has also eluded the westem thinkers. Jain philosophy describes ＂jiva＂ （soul） as the sentient substance, which is non-physical and not sense-perceptible; consciousness and ＂upayoga＂ （manifestation） are the differentia of ＂jiva＂. Consciousness manifests itself in many ways： intelligence, intuition, conation, bliss, perception （cognitive elements）, emotions, will, attitude and behavior, awareness of pleasure and pain. Jain distinguishes between soul and mind. The mind does not possess consciousness, which is the exclusive property of soul. Mind like soul is not permanent entity, and it exists only when consciousness manifests as thoughts, beliefs, desires, emotions and feelings. All these activities are influenced by karma, which is interface between soul and mind. Our existence is seen to be at three levels： soul, mind and body. Soul is the source of intelligence; mind （subtle body） is the executive and regulatory body and material body is the place of physical actions. A model of interactions between these three units is presented. The soul perceives and knows the external world through mind, so the perceptions made by soul are influenced by mind. The relationship between brain and mind is discussed. The brain is seen as the center for information storage and processing, its activity is regulated by mind, which in turn is conditioned by the soul. The conscious experience is made by the soul, not the mind. The Jain model of soul, mind and body avoids all objections raised against dualism, as interaction between soul and karma body （unconscious part of mind） is assumed to be based on parallelism, and that between mind and body is through radiations not violating the law of conservation of energy.