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Table of Content
20 April 2009 Volume 28 Issue 4
著者文摘
Research on the oscillation of a hanging chain pendulum --an accurate determination of the acceleration of gravity
. 2009, 28(4): 1-1.
Abstract
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746
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832
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The motion problems of a hanging chain pendulum, involving its solution of oscillation, eigenfrequency, properties, complex oscillations and energy distribution, are investigated. The present theoretical result is compared with the experiment and a method of determining the acceleration of gravity g is given. The g can be measured in this way with an accuracy of about 0. 01%. Two summation formula of the infinite series with respect to the zeros of J0（x） are educed.
The analysis method for phase measurement of phase object
. 2009, 28(4): 6-6.
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895
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(460KB) (
1310
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Some phase measuring methods for the phase object are introduced, which include the tradition dark field, schlieren and phase contrast ones. The method of double point sources interfence scanning image for phased object is introduced especially based on image processing. Their advantages and disadvantages are compared and the development of the current phase measuring research of the phase object is summarized finally.
Double-mode integral form projection operator and its application
. 2009, 28(4): 11-11.
Abstract
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613
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312
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A double-mode integral form projection unitary operator is introduced. Using the technique of integration within an ordered product （IWOP） of operators, the transformation character of the integral form projection operator is studied. The Hamihonian of double-mode quantum harmonic oscillator system with kinetic coupling is diagonalized by virtue of the integral form projection operator, and then the eigenenergy and eigenfunction of the system are accurately solved. Finally the particular case is discussed.
Research on variation of oscillating period of three-wire pendulum with rigid body
. 2009, 28(4): 14-14.
Abstract
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759
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(358KB) (
984
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The varying regularity of oscillating period of three-wire pendulum with rigid body above it is derived theoretically according to the oscillation equation, a new experiment is designed to measure the oscillating period of three-wire pendulum in all sorts of condition, and the varying regularity is exposited intuitively using descriptive geometry solution. It is shown that the theoretical result is in agreement with the experiment.
Study on rotation period of triple pendulum with different objects
. 2009, 28(4): 18-18.
Abstract
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1010
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(247KB) (
892
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The theoretical analysis on the rotation periods of triple pendulum for disk, cirque and cylinder are presented. The corresponding experiments are also finished. There exist good consistency between theoretical analysis and experimental results.
A further discussion on the motion of solid body pellets in liquid of revolve
. 2009, 28(4): 20-20.
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826
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(267KB) (
402
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The pressure of the liquid in revolve is analysed; the motion reason of solid body pellets in liquid as well as application in reality are explained.
Another general formula of equivalent resistance of 3 × n step network
. 2009, 28(4): 23-23.
Abstract
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662
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(323KB) (
545
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The equivalent resistance of 3 × n-step network is studied again. By means of virtual current method, the 3 × n-network is analyzed and a model of two-variable difference equation is proposed. The matrix transform is constructed by artifice. Based on different marginal conditions, a general formula for the inlet resistance of 3 × n-network as well as an utmost rule for the equivalent resistance of 3 ×n-network are presented. It is proved that the utmost equivalent resistance of infinity resistance network is equal to a constant.
The variational approach to capillary action
. 2009, 28(4): 26-26.
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828
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(251KB) (
465
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By studying the internal wall of columniform capillary, the liquid and gas in it, and regarding the surface of the liquid as the rotational surface, we deduce the free energy functional. When the free energy functional arrives maximum, the Euler equation turns to the Laplace formula of additional pressure, and we also derivate the Young＇s equation by use of the moving boundaries conditions. It is a necessary condition for the two functions at the extremum for free energy functional.
A convenient calculation for intensity distribution of circular aperture Fraunhofer diffraction
. 2009, 28(4): 29-29.
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1162
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(447KB) (
1474
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Using the amplitude distribution of one-dimensional diffraction of light, the amplitude and intensity distribution of circular aperture Fraunhofer diffraction are obtained and computer simulation of diffraction by graphing the diffraction patterns is realized with Mathematica soft
Research on flux-gate magnetometer experiment of phase modulation
. 2009, 28(4): 33-33.
Abstract
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474
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(384KB) (
487
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By designing the flux-gate magnetometer sensor of measuring the low intensity field, the principle and technology of phase modulatory flux-gate magnetometer is introduced. The methods of measuring the low intensity field of flux-gate magnetometer based on the phase modulation are discussed in detail.
The design of detecting instrument for moire fringe speciality
. 2009, 28(4): 37-37.
Abstract
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746
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(258KB) (
517
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The design of a new detecting instrument for moire fringe speciality by using CCD is introduced. The structure of the new instrument is completely open and the process of detecting is intuitionistic. This instrument can be used to detect all the characteristics of moire fringe. This paper primarily focuses on the structure and the measuring theory of the instrument. The moved number of moire fringe which is caused by relative shift of the gratings is nice, and the width of molte fringe which is caused by the bias angel of the gratings is verified to closely consistent with theoretical result.
The relatively intensity measurement of the Hg atom Zeeman effect spilt spectrum line
. 2009, 28(4): 40-40.
Abstract
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1113
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(266KB) (
1643
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In order to study the relatively intensity of Zeeman effect split spectrum line, the quantum number distribution and the relatively intensity are presented in detail by the analysis of Hg（546.1 nm）spilt spectrum line in the external magnetic field; the image of coherence circle is obtained by CCD, and the intensity of image is analyzed, the relatively intensity of the spilt spectrum line by image disposed is close to the theoretical result. It is concluded that the phenomenon and rule of Zeeman effect can be analyzed by CCD image technology.
HU Gang--fu A Chinese forerunner in physics
. 2009, 28(4): 43-43.
Abstract
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972
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HU Gang-fu （1892--1966）, who accomplished his education in physics earlier than others, was a first-generation Chinese physicist, a well-known science educator, and a Chinese forerunner in modern physics. For almost half of a century, he dedicated his life to China＇s science education and higher education, bringing up for China a host of talented people in science and technology. After a brief account of his family background and life, this article dwells upon HU Gang-fu＇s significant contributions to science education as well as his educational thought and style of work.
Analysis and application of the interference phenomenon in spectrometer adjustment
. 2009, 28(4): 52-52.
Abstract
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575
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(432KB) (
612
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An interference phenomenon in the experiment of adjusting spectrometer is discussed mainly. When turning the glass used in the experiment to adjust the verticality between the axis of telescope and the axis of the apparatus, an interference phenomenon together with variation in width of the stripe can be seen. The reason of the phenomenon and variation of the stripe in theory are analyzed. If one knows how thick the reflector is and the wavelength of the light used in the lab in advance, one can use this phenomenon to measure the refractive index of the glass. The calculating method, data processing and error analyzing are also shown.
A computer simulation of vision image of moving body at high speed
. 2009, 28(4): 56-56.
Abstract
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729
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(393KB) (
897
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The vision image of moving body at high speed close to velocity of light is simulated by Matlab soft, the Terrell＇ s rotation visual is shown. This could help readers to understand the special theory of relativity effect of moving body at high speed more clearly and then makes readers have deeper comprehension to the special theory of relativity.
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