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Table of Content
20 January 2016 Volume 35 Issue 1
著者文摘
Spacetime symmetries and conservation laws --Newtonian mechanics
. 2016, 35(1): 1-1.
Abstract
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1348
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906
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Emmy Nother declared that to every kind of symmetry there is a corresponding conservation taw. In the present paper, the conservation laws of energy, momentum and angular momentum in Newtonian mechanics are derived from the translational and rotational spacetime symmetries.
Calculationof electromagnetic wave＇ s cutoff frequency and propagation constant in waveguide under symplectic system
. 2016, 35(1): 4-4.
Abstract
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847
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(375KB) (
542
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Deducing from the variational principle, longitudinal component of electromagnetic waveguide is e- liminated and the transverse electric and magnetic components are treated as dual vectors to each other. Then the Maxwell equations for electromagnetic waveguide are derived to Hamilton system formulation and symplectic geomet- ric form. The finite element method is used to discretize the cross section of the waveguide structure, and a set of linear algebraic equations are obtained for calculating the cutoff frequency and propagation constant of electromag- netic wave in waveguide. Examples demonstrate the accuracy of the proposed method. This paper also provides a new approach to analyze and calculate the problem of electromagnetic waveguide.
The vibrational modes of Koch snowflakes
. 2016, 35(1): 7-7.
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728
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373
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The eigen vibration modes of Koch snowflake are drawn from numerical solutions. The symmetries of these modes and distribution of wave-vector are discussed.
Oscillation of a simple pendulum with extremely large amplitude
. 2016, 35(1): 11-11.
Abstract
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931
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658
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Based on the dynamical equations and the initial conditions, the oscillation of a simple pendulum with large amplitude is analyzed approximately. A method is introduced to estimate the period of a simple pendulum with an extremely large amplitude whose value is approaching π. The results show that the deviation between the ex- act value and estimated value of the period increases with the decrease of the oscillation amplitude. The linear ap- proximation leads to the increment of the errors.
Derivation of Kelvin equation for spherical crown liquid droplet lied on solid surface
. 2016, 35(1): 15-15.
Abstract
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1006
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1120
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This paper deduces the thermodynamic criterion of two phase balance between spherical crown liquid droplet and gas. The gas pressure balanced with spherical crown liquid droplet is unrelated to solid material in terms of Young＇s formula and formula of spherical geometry. The process of proof has clear physical model and thermody- namlc meaning
Teaching RC and RL transient state processes based on attenuation phenomena
. 2016, 35(1): 17-17.
Abstract
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654
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(368KB) (
537
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According to the modern educational theories, a typical attenuation with a constant attenuation coef- ficient is analyzed to decipher RC and RL transient state processes, and the essence of three-factor method for the first order circuit is revealed. Consequently, an active and meaningful strategy for solving these problems is obtained and therein lies a successful method of improving the learning effect.
Electrostatic field between two concentric conductive spherical shells
. 2016, 35(1): 20-20.
Abstract
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850
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655
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Electrostatic field is discussed when there are ductive spherical shells using uniqueness theorem.Expressions given. non-uniform dielectrics of electrostatic field and between two concentric con- distribution of electricity are
The field distribution of TEM wave in a strip line and its structure simulation
. 2016, 35(1): 24-24.
Abstract
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1005
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(974KB) (
595
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By solving Laplace＇s equation,the series solution of the field distribution of the TEM wave in a strip line is obtained.Further,the TEM wave in a strip line is simulated by MATLAB and HFSS.The present study has the certain reference value for calculating the decay constant of the transmission line, realizing its power capability, con- sidering its power coupling and designing the related active device.
Resonance characteristics of RLC series circuit stimulated by electromotive force with square wave
. 2016, 35(1): 28-28.
Abstract
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1080
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(257KB) (
844
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Resonance characteristics of RLC series circuit stimulated by electromotive force with square wave are theoretically studied, and the resonance condition and waveform feature of capacitor voltage are obtained. All these results are also stimulated.
Discussion on the experiment of liquid surface tension coefficient by the pull-off method
. 2016, 35(1): 31-31.
Abstract
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2384
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2224
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As the error is too large when the liquid surface tension coefficient with pull-off method is measured. We compare this method with other methods, introduce the principle of the pull-off method, analyze the impact of state of the springs and wire on the experimental results, and explaine the unusual movement of engraved line near the end of the pulling of the film.
Quantitatively discussion of the sub-maximum phenomenon in sound velocity experiment
. 2016, 35(1): 35-35.
Abstract
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1124
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614
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The experiment of measuring sound velocity in university plays the important role in comprehending the knowledge of wave superposition and standing wave. However, the sub-maximum phenomenon existing in the resonance interference method usually results in mistakes during experiment.This paper discusses quantitatively this phenomenon.Based on the numerical simulation of Matlab software, Fourier spectrum analysis of the information pro- duced by signal generator,and compared with the experiment data, the conclusion is that the sub-maximum phe- nomenon is not related with the sub-frequency signal.
A method of electric heating ratio measuring the specific heat capacity of liquid
. 2016, 35(1): 39-39.
Abstract
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886
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(348KB) (
834
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In the liquid specific heat capacity measurement experiment using the electric heating method, the Newton＇s law of cooling is usually used to correct the system heat dissipation problem.Through calculation and analysis of the system heat dissipation,a new measurement scheme is put forward to reduce the effects of the system heat dissi- pation on the test results.The system heat dissipation ratio of two different heating processes is used to measure the liquid specific heat capacity in the new method.Test results show that the measurement scheme has strong operability and high precision, which is suitable for popularization and promotion in the university physics experiment teaching.
Element of relativity
. 2016, 35(1): 42-42.
Abstract
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1125
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501
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The paper introduces the inspiration and the influence of ＂thought experiments＂ and Euclid＇ s （（ele- ments）） to Einstein in seting up the special relativity. Einstein was the sole founder of the special relativity.
Physics experiment teaching of Washington university ——Taking the teaching of ＂Introduction to the Physics＂ as an example
. 2016, 35(1): 45-45.
Abstract
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1151
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(804KB) (
494
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＂Introduction to the Physics＂ is a course which includes both theoretical and experimental parts in Washington university.It has characteristics in teaching content and mode.The experimental part is closely related to the theoretical one, clarifying the problems.The lecture note begins with the physical facts or little stories and leads to the physical principle and the key points of the course.And it ends with the extended introduction of the experi- mental backgrounds and the related frontier technology.The great attentions are paid on sparking the students＇ inter- ests, developing their abilities on modeling, prediction and cooperation.The essay also introduces their demands for students＇ experimental reports （ including reveal of the key points to score） , the advanced apparatus and technology, the combination of laboratory management and quality training of students, and other effective measures.
The demonstrating experiment for Sagnac effect
. 2016, 35(1): 49-49.
Abstract
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1001
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(915KB) (
570
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Based on fibre optic interferometer, the principle Sagnac demonstrative experiment is build up. The present device is easy to operate finely demonstrates Sagnac effect. effect is introduced and a device for and its phenomenon is obvious, which
Physics experiment teaching of Washington university--Taking the teaching of ＂Introduction to the Physics＂ as an example
. 2016, 35(1): 53-53.
Abstract
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1364
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PDF
(644KB) (
698
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＂Introduction to the Physics＂ is a course which includes both theoretical and experimental parts in Washington university.It has characteristics in teaching content and mode.The experimental part is closely related to the theoretical one, clarifying the problems.The lecture note begins with the physical facts or little stories and leads to the physical principle and the key points of the course.And it ends with the extended introduction of the experi- mental backgrounds and the related frontier technology.The great attentions are paid on sparking the students＇ inter- ests, developing their abilities on modeling, prediction and cooperation.The essay also introduces their demands for students＇ experimental reports （ including reveal of the key points to score） , the advanced apparatus and technology, the combination of laboratory management and quality training of students, and other effective measures.
Derivation of the Bragg equation in the case of refraction and the half-wave loss
. 2016, 35(1): 57-57.
Abstract
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1914
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(184KB) (
753
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To simplify the derivation of the Bragg equation and at the same time to reflect profoundly the physical nature of the crystal X-ray diffraction, a more universal Bragg equation is given using the single-beam reflectance model on the basis of law of refraction and coherent conditions in the case of considering refraction and the half-wave loss
Was Born astaunch anti-communist？
. 2016, 35(1): 59-59.
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868
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580
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Max Born was one of the greatest physicists in the 20th century. He had strong sense of social respon- sibility and progressive political inclinations. To review the process by which he contacted with Marxism, and to an- alyze the cause which formed and changed his attitude to Marxists and the socialist system could help us to deepen the understanding and to give the scientific evaluation of the political ideas of west natural scientists.
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