一种新的海洋波被发现

美国与墨西哥的地球物理学家Ｒ .Ｂｕｌｔｅｒ和Ｃ .Ｌｏｍｎｉｔ博士最近在夏威夷 2号观测台发现了一种新的海洋波 ,这个观测台是放置在夏威夷与加利福尼亚州之间的海底 ,它能观测与记录各种类型的海洋波 .通常海洋中存在着两种海洋波 ,一种是声波 ,在水中的声波其作用原理是与在空气中的声波一样 ,即由不断更替的膨胀压缩运动所形成的纵波 ,只是其速度是由波在水中传播的快慢决定 .另一种是由地震引发的在地球表面附近传播的瑞利波 ,它一般是在地壳下的沉积层内沿着运动的水平与垂直方向传播的横波 .2 0 0 0年 6月在太平洋海底约 10公里处…     

关于功的一种新的教学思路*--从概念起源和科学方法的角度学习

针对“功”的教学现状,在查阅资料中,我们认为不仅可以引导学生从概念起源的角度来学习功,更可以让学生在学习功的概念之中体会和感悟物科学方法。我们提出全新的教学设计,并在教学实践之中进行尝试。在这样的教学设计和实践中,学生们明确功的概念起源之后,在头脑中自然形成判断一个力是否做功的逻辑依据,并且按照逻辑顺序自然掌握了计算一个力做功多少的方法。     

Scientific realism: A challenge to physicists

If a physicist claims to be a realist, he or she must face at least the three problems outlined here: the careful specification of the validity limits of every theory and model used, the coherence relationships that must hold between two theories of the same physical system but on different cognitive levels, and the ambiguity in the ontology of two different formulations of empirically equivalent theories.This paper is dedicated to Professor Max Jammer in honor of his eightieth birthday. I have learned a great deal from his many excellent papers and books in history and philosophy of physics. Thank you and congratulations!     

John Bardeen and the Theory of Superconductivity: A Late Revision of a Homework Assignment for J. M. Luttinger

This account of the history of the Bardeen–Cooper–Schrieffer theory of superconductivity has its roots in an assignment that Quin Luttinger designed for me in 1963 when I was his graduate student. It improves on my student work by tracing the story from historical source materials as well as published papers, thus reflecting the contingencies and human elements that shape all research in physics. I also made an attempt to portray general features of how John Bardeen approached solving problems in physics.     

John Archibald Wheeler: A few highlights of his contributions to physics

The following quotations describe in nutshells a few highlights of John Archibald Wheeler's contributions to physics. The contributions are arranged in roughly the following order: (i) concrete research results, (ii) innovative ideas that have become foundations for the research of others, (iii) insights that give guidance for the development of physics over the coming decades. Since most of Wheeler's work contains strong elements of two or even all three of these characteristics, the editors have not attempted to delineate the dividing lines between the three categories.