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Table of Content
20 February 2008 Volume 27 Issue 2
著者文摘
Commemorating 60^th anniversary of the invention of transistor
. 2008, 27(2): 1-1.
Abstract
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881
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675
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This essay describes the work of three scientists who had made great contribution to invention of the earliest three types of transistor. It uncovers some true stories about scientific research and mirrors their attitude towards science and their extraordinary creativity. It also illustrates some regrets and insufficiencies of them, from which successors can learn some lessons.
On the wave equations of rotating strings
. 2008, 27(2): 7-7.
Abstract
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785
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(294KB) (
552
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Wave equations for two different types of rotating strings are given in some reference books or text- books of methods of mathematical physics, but the effect of the Coriolis force is not taken into account. There-fore the discussions are incorrect （for vertical rotating heavy string） or incomplete （for horizontal rotating light string）. These wave equations are re-derived and their solutions are discussed.
On the wave equations of rotating strings
. 2008, 27(2): 10-10.
Abstract
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834
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(281KB) (
398
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Wave equations for two different types of rotating strings are given in some reference books or text- books of methods of mathematical physics, but the effect of the Coriolis force is not taken into account. There-fore the discussions are incorrect （for vertical rotating heavy string） or incomplete （for horizontal rotating light string）. These wave equations are re-derived and their solutions are discussed.
Calculation of ground-state energy of two-dimensional quantum dot with two electrons
. 2008, 27(2): 14-14.
Abstract
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911
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(375KB) (
760
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The ground-state energy of two-dimensional quantum dot with two electrons is calculated by using perturbation, numerical exact diagonalization and variational theory. When Compared with earlier unrestricted Hartree-Fock studies, it turns out that the three-parameter variational wave function is an excellent repre- sentation of the true ground state.
A new representation of general linear quantum transform in phase space
. 2008, 27(2): 19-19.
Abstract
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657
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364
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Taking coordinate and momentum operators as basic operators of phase space, a new representation of general linear quantum transform is obtained, includinge transformation relationship expression, the condition of unitary transformation, the ordinary, normal product and anti-normal product expressions of transform operator.
A study on transverse vibration of spring
. 2008, 27(2): 22-22.
Abstract
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821
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576
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The transverse vibrations of a mass attached at the midle of a spring is studied.
The non-linear oscillation in the combined spring oscillator
. 2008, 27(2): 25-25.
Abstract
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943
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(261KB) (
720
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The motions of several kinds of common linear spring combination are studied using the Lagrange function method. Numerical solutions are obtained for non simple harmonic vibrations. The results show that the solutions for small vibrations belong to certain typical non-linear oscillations. The analyticl and numerical solutions are also compared.
Two simple methods for solving axially symmetrical magnetostatic field
. 2008, 27(2): 29-29.
Abstract
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945
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950
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To solve axially symmetrical magnetostatic field, the cylindrical function expansion of vector potential is derived, the series expansion for expressing off-axis magnetic field by the axial values is obtained.At last, some examples using the two methods are given.
Analysis and study on teaching of circuit with controlled sources
. 2008, 27(2): 33-33.
Abstract
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815
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618
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The analysis and calculation on circuit with controlled sources are focal point and difficult point in the course teaching of circuit. Some teaching experences are introduced including the differences between inde-pendent sources, equivalent conversion of power in the circuit with controlled sources, solving the input resis-tance, treatments in using the electric current law of loop circuit and node voltage, problems should be noticed on using superposition theorem and Thevenin＇s （Norton＇s）, etc.
Electrostatic energy of a revolving elliposidal capacitor
. 2008, 27(2): 36-36.
Abstract
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978
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(208KB) (
838
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By using the Zhukovsky conversion in the complex coordinate system, the electrostatic energy of a charged revolving ellipsoidal capacitor is calculated and discussed.
Explorating for the Hermite eigenvalue problem
. 2008, 27(2): 39-39.
Abstract
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741
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523
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A typical example of the exploration method in mathematical physics methods is showed. The Hermite polynomials are obtained from the eigenvalue problem by means of plausible reasoning. This exploration method is helpful to the students to develop their creative ability.
Study on the experiment on double funnel soapfilm
. 2008, 27(2): 42-42.
Abstract
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1042
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1069
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The shape of soapfilm and its characteristic and process of variation in the experiment on double funnel soapfilm are researched. An important conclusion is educed in theory and validated by experiment： the maximum distance between the two funnel is the funnel radius times 1. 325. The carelessness about this problem in some textbooks is pointed out.
The application of higher order polynomial in fitting magnetic hysteresis loop
. 2008, 27(2): 45-45.
Abstract
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927
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(261KB) (
598
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Higher order polynomial-fitting is applied to fit the magnetic hysteresis loop. Two polynomial- fitting equations are used.
The measurements of the systemic uncertainty of the capacitor and the related corrections in the ＂Studies on the transient processes in a RLC series circuit＂ experiment
. 2008, 27(2): 48-48.
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2811
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(221KB) (
1315
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In the experiment named ＂Studies on the transient processes in a RLC series circuit＂, large differences between the theoretical and the experimental values of the damp oscillating period have been detected. It has been found that these differences are induced by the capacitance between the two probes of the oscillograph and the ＂zero capacitance＂ of the capacitors. Experiments are performed to obtain the value of these two capacitances and the theoretical values of the damp oscillating period are recalculated with the consideration of these two capacitances
Investigation on detection sensitivity of linearly polarized rotatory angle
. 2008, 27(2): 50-50.
Abstract
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717
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(296KB) (
551
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It is analyzed theoretically and investigated experimentally for the vision detection and positioning in an experiment of linear polarization rotatory. Under various conditions, the best method of sensitivity detection is suggested by means of detection sensitivity analysis and verification. Finally, the investigation on difference between the detection positioning and vision using photoelectric technique are carried out and the new method and way of increasing detection sensitivity are pointed out.
Study and practice on the construction of a researchful and interactive class with Voting Machine
. 2008, 27(2): 54-54.
Abstract
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755
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(355KB) (
421
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The implement of high education ＂Quantity Project＂ has brought forward more advanced and higher requirements and challenges for undergraduate instruction. This paper reports our study and practice of constructing a researchful and interactive bilingual physics class with Voting Machine, which is a strong interactive teaching and learning equipment with statistical ability.
The indices of lattice planes must be relatively prime
. 2008, 27(2): 59-59.
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1226
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949
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By plane equation, the proposition that the indices of lattice planes must have no common factor is proved.
Study on the experiment measuring surface tension coefficient
. 2008, 27(2): 60-60.
Abstract
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1096
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(313KB) (
671
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The experinaent of measuring the surface tension coefficient is studied. The experimental principles are analyzed and the differences between the use of the spring and sensors are pointed out. The formula of calculating the surface tension coefficient is given by using power sensor. The precision of the experiment is improved and the operation is simplified.
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