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Table of Content
20 January 2014 Volume 33 Issue 1
著者文摘
Theoretical physics teaching playing effect in cultivalting students＇ critical thinking
. 2014, 33(1): 1-1.
Abstract
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641
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(524KB) (
454
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A Way for cultivalting students＇ critical thinking in theoretical physics courses is investigated. The important knowledge is conformed ,for instance, the concept and definition, the result in order, the well-known law, the realistic data, and the science story. Those should be discussed, analyzed and summarized in the classroom. It has shown that which plays a better effect in increasing teaching quality.
The probability density distribution and electric dipole moment of hydrogen atom in electric field
. 2014, 33(1): 6-6.
Abstract
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909
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(1766KB) (
476
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Using numerical method the picture of probability distribution of the electron in Stark effect is analyzed, the relationship between the direction of the electric dipole moment and the probability density distribution is also discussed.
Discussion on the relation between depolarizing factor and shape factor
. 2014, 33(1): 12-12.
Abstract
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1228
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(244KB) (
909
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Based on the spatial distribution of electric potential of a sphere or ellipsoid in a matrix, the depolarizing field inside the sphere or ellipsoid is investigated. Furthermore,the relation between depolarizing factor and shape factor is obtained.
On the equilibrium condition for movable piston
. 2014, 33(1): 14-14.
Abstract
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1258
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(574KB) (
676
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It is not a sufficient equilibrium condition that the pressures are equal on both sides of a smooth adi- abatic movable piston. We consider a system consisting of ideal gas which is partitioned into two parts by an adiabatic movable piston. From the microscopic point of view, even if the two parts are with equal pressures that different temperatures, energy can still transfer from higher temperature gas to lower temperature gas through the piston vibration,which is difficult to observe in macroscopic systerm but very significant in mesoscopic system.
Discussion on the relation between depolarizing factor and shape factor
. 2014, 33(1): 17-17.
Abstract
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1989
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PDF
(409KB) (
1617
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Based on the spatial distribution of electric potential of a sphere or ellipsoid in a matrix, the depolarizing field inside the sphere or ellipsoid is investigated. Furthermore,the relation between depolarizing factor and shape factor is obtained.
Solution of one-dimensional motion of a particle in a constant force field
. 2014, 33(1): 22-22.
Abstract
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768
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PDF
(251KB) (
633
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Based on the equivalence between momentum representation and coordinate representation, an alternative method is presented,where the momentum representation and the Feynman＇ s path integral are employed to calculate the propagator function of a particle in a constant force field,then the result is transformed into the coordinate representation. We present a way to solve the Feynman＇ s path integral, which exhibits the high value of momentum representation if the solution of one-dimensional motion of a particle in a constant force field.
Several important physical constants in college physics
. 2014, 33(1): 25-25.
Abstract
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1388
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(629KB) (
1316
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For history, definition,
Proving some relations of Hermite polynomials via the normal product of quantum operators
. 2014, 33(1): 31-31.
Abstract
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794
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(326KB) (
505
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The recursion relations of Hermite polynomial are proved with the help of the method of quantum mechanics. Furthermore, two integral formulas related to the Hermite polynomial are obtained according to the expression of the Hermite polynomial.
Experimental study of permanent magnet rotating behavior in non-contact driving mode
. 2014, 33(1): 35-35.
Abstract
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647
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(736KB) (
398
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Non-contact driving mode is composed of rectangular permanent magnet with a spin axes and a turning aluminum disc. Keeping the turning speed of aluminum disc in constant, and the angular speed and angular acceleration of magnet which is driven by electromagnetic induction is tested simultaneously. These are found that the angular speed has a tiny fluctuation periodically and angular acceleration vibrates between negative and positive maximum value with the same period. Starting from the viewpoint of molecular current,an analytic expression descri- bing the magnetic field distribution in space is derived from the Biot-Savart＇s law and principle of electromagnetic field superposition. And the angular acceleration and electromagnetic driving moment are calculated quantitatively when the permanent magnet rotates to any position. The reasons of angular speed appearing periodic tiny fluctuation and the angular acceleration vibrated between positive and negative maximum are due to the joint actions of driving moment and air damping, and this conclusion is consistent with the experimental result.
Resarch and development of a F-P etalon characteristics investigating and high-accuracy wavelength measuring instrument
. 2014, 33(1): 40-40.
Abstract
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824
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(380KB) (
515
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A set of concentric interference circles is formed for diffused monochromatic light illuminated a F-P etalon. Fractional orders at the centre of the interference fringes are determined by excess fraction method. The spec- trum of the light source consists of certain adjacent wavelengths,including one He line,one Ne line, and a few Hglines. Thus images of the resulting sets of interierence circles are obtained simultaneously by a digital camera at the focal plane of the imaging lens. The diameters and standard deviations are computed by the circular regression of coordinate data. The fractional orders are calculated by weighted regressions in a new quasi-linear model, and the expanded uncertainties are assessed corresponding to different wavelengths. Inducing three of the wavelengths to the process to solve the fraction orders by excess fraction method,the spacer d of the F-P etalon is calculated to be d± Ad=（3 096 977.97±1.76）nm.
Operating inspired experiment education by liquid crystal cell photo-electric characteristics measuring
. 2014, 33(1): 43-43.
Abstract
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572
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PDF
(301KB) (
349
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In order to adapt modern-physics experiment course quality, we adopt inspired experiment education ,concerned on training operation skill, increasing study ability and developing scientific attitude. The liquid crystal cell photo-electric characteristics measuring is taken to be an example to present the inspired experiment education. In addition, we summarize the teaching feeling of teachers.
Experimental study on electrooptic modulation of twisted nematic liquid crystal
. 2014, 33(1): 46-46.
Abstract
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881
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PDF
(771KB) (
480
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By studying the operation principle and optical characteristic of TN type liquid crystal, an experi- mental metho~t of liquid crystal electrooptic modulation derived by square wave voltage signal is proposed. Using liquid crystal electrooptie effect experimental apparatus,the electrooptic curve and threshold voltage of twisted ne- matic liquid crystal （TN-LC） excited by the voltages with different frequency and wave types, are measured. The influence of the frequency and wave types on the electrooptic curve, threshold and gradient,is analyzed. On the ba- sis of these,the sine wave modulation is realized by adding 3 000 Hz square wave to TN type liquid crystal, and the result of the electrooptic modulation is investigated. This method of electrooptic modulation can be used to the audio -visual display of electric signal response property of liquid crystal materials.
Brushed DC motor mathematical model and parameter measurement method
. 2014, 33(1): 56-56.
Abstract
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2431
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(713KB) (
1124
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The DC motors are widely used in daily life. To improve the control performance of the smart car, we establish the brush DC motor mathematical model,which can control well the accuracy and optimize performance. Besides,we also provide a method of getting the mathematical model parameters of the motor which has unknown SPECS by experiments, namely, the step response measurement of transfer function parameters.
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