Physics inspired algorithms for (co)homology computations of three-dimensional combinatorial manifolds with boundary

The issue of computing (co)homology generators of a cell complex is gaining a pivotal role in various branches of science. While this issue may be rigorously solved in polynomial time, it is still overly demanding for large scale problems. Drawing inspiration from low-frequency electrodynamics, this paper presents a physics inspired algorithm for first cohomology group computations on three-dimensional complexes. The algorithm is general and exhibits orders of magnitude speed up with respect to competing ones, allowing to handle problems not addressable before. In particular, when generators are employed in the physical modeling of magneto-quasistatic problems, this algorithm solves one of the most long-lasting problems in low-frequency computational electromagnetics. In this case, the effectiveness of the algorithm and its ease of implementation may be even improved by introducing the novel concept of lazy cohomology generators.     

纪念《物理测试》杂志创刊30周年

在纪念全国冶金物理测试信息网建网30周年之际,作为全国冶金物理测试信息网网刊的《物理测试》杂志也将迎来创刊30周年。文章回顾了《物理测试》杂志自创刊以来的发展历程,阐述了杂志的办刊思想和特点,总结了杂志为创建科技期刊品牌所作出的努力,并为《物理测试》杂志指出了美好的发展方向,希望杂志成为适应钢铁材料发展、满足广大作者和读者需求的优秀刊物。     

新形势下普通高专物理课的设置管窥

结合我校学生物理成绩差的现状及物理学的作用，指出物理课的重要性，阐述了物理课设置如何适应新形势的发展。     

浅议物理开放性试题对学生物理思维品质的培养

物理思维品质主要包括思维的深刻性、灵活性、批判性、创造性四个方面。本文结合物理开放性试题具有的开放性、新颖性、真实性、综合性等特点,通过实例论证了物理开放性试题对培养物理思维品质所起的作用。     

Experimental and physical approaches on a novel semiconducting-ionic membrane fuel cell

Semiconducting-ionic membranes (SIMs) have exhibited significant superiority to replace the conventional ionic electrolytes in solid oxide fuel cells (SOFCs). One interesting phenomenon is that the SIMs can successfully avoid the underlying short-circuiting issue and power losses while bringing significantly enhanced power output. It is crucial to understand the physics in such devices as they show distinct electrochemical processes with conventional fuel cells. We first presented experimental studies of a SIM fuel cell based on a composite of semiconductor LiCo_0.8Fe_0.2O₂ (LCF) and ionic conductor Sm-doped CeO₂ (SDC), which achieved a remarkable power density of 1150 mW cm^?2 at 550 °C along with a high open circuit voltage (OCV) of 1.04 V. Then, for the first time we used a physical model via combining a semiconductor-ionic contact junction with a rectifying layer which blocks the electron leakage to describe such unique SIM device and excellent performance. Current and power are the most important characteristics for the device, by introducing the rectifying layer we described the SIM physical nature and new device process. This work presented a new view on advanced SIM SOFC science and technology from physics.     

物理学中的定义定律和物理模型

本文站在自然辩证法的高度，从理论上研究了物理模型、物理概念、物理量、物理学基本定律间的关系，从实践上指出了几种有影响的教材中存在的问题．     

A modernized and versatile startup reactivity measuring system installed at NPP Paks and its application for subcritical systems

In 2004 the Hungarian Paks NPP completed a project for upgrading the reactivity measuring system applied during reactor startup experiments. Almost all components of the previous system were replaced, only ex-core ionisation chambers remained unaltered. New hardware and software components were introduced for neutron flux signal handling, for data acquisition, as well as for measurement evaluation and data presentation. High-precision picoamper meters were installed at each reactor unit, current signals are handled by a portable signal processing unit. The system applies an accurate on-line reactivity calculation algorithm based on the point-kinetic model with six delayed neutron groups. Detailed off-line evaluation and analysis of startup measurements can be performed on the portable unit, as well.The paper describes the architecture, data acquisition modules, services and man–machine interface of the new system. Functions and results are illustrated with measured data recorded during a startup of Unit 3. In 2003 and 2004 the RMR was installed and tested at all Paks NPP units successfully and now it is in regular use during unit startups.The second part of the paper illustrates an extension of the new system to perform reactivity measurements using the well-known Rossi-α and Feynman-α statistical methods. The modified system was needed to estimate the reactivity of a subcritical system formed by damaged fuel assemblies stored at the fuel service pit of Paks Unit 2. Theoretical background of the applied algorithms is outlined, then results of validation tests and on site measurements are treated. The measurements have shown that the subcriticality of the damaged fuel was sufficiently deep if the high boron concentration in the fuel service pit was maintained.     

《大学物理学》课程多媒体教学的实践与探讨

《大学物理学》课程是一门与实验和实际密切相关联的课程,适用于多媒体教学。文章阐述了多媒体技术在大学物理教学中的作用,多媒体课件的制作,多媒体课件应用过程中应注意的问题。     

Flash多媒体课件在物理实验教学中的应用

随着科学技术的发展,计算机技术渗透到各行各业,以多媒体形式同样掀起了课堂教学的新改革。多媒体技术已进入物理实验教学课堂。它以图文并茂、声像俱佳、动静皆宜的表现形式将物理实验现象由抽象转化为形象、微观转化为宏观,将物理实验教学引入了新的境界。本文根据物理学科的特点,简要介绍了Flash多媒体教学课件在物理实验教学中的应用。     

Flash多媒体课件在物理实验教学中的应用

随着科学技术的发展，计算机技术渗透到各行各业，以多媒体形式同样掀起了课堂教学的新改革。多媒体技术已进入物理实验教学课堂。它以图文并茂、声像俱佳、动静皆宜的表现形式将物理实验现象由抽象转化为形象、微观转化为宏观，将物理实验教学引入了新的境界。本文根据物理学科的特点，简要介绍了Flash多媒体教学课件在物理实验教学中的应用。