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Table of Content
20 September 2011 Volume 30 Issue 9
著者文摘
Analysis of causes and calculation for the earth nutation
. 2011, 30(9): 1-1.
Abstract
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928
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2271
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The main reasons of the earth nutation are analysed theoretically and the nutation constant is calculated.The relative difference between the theoretical calculation value and the observed one is about 2/10 000.
The nonunitary transformation in the Hamilton＇s rewriting for the one-dimensional linear harmonic oscillator
. 2011, 30(9): 8-8.
Abstract
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944
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395
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By introducing a nonunitary operator,the rewriting for the one-dimensional linear harmonic oscillator from the coordinate-moment representation（Q,P） to the particle number representation（a,a＋） is realized.
Exact wave function of the n-module coupled harmonic oscillators quantum system
. 2011, 30(9): 10-10.
Abstract
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694
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311
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The normal frequencies and its corresponding normal coordinates and conjugate momentums of the n-module coupled harmonic oscillators quantum system are derived by using the invariant eigen-operator method.The Hamiltonian of the system is decoupled and then the visible analytic solution of normal frequencies in the system is obtained.The analytic solution of wave function of the system in the coordinate representation is deduced.Through the discussion of the coupling coefficients of different situations,we have concluded that the coupled harmonic oscillator systems with the n-module momentum or coordinates are just special cases of the system under study.
A simple configuration-interaction calculation for ground state of Helium
. 2011, 30(9): 15-15.
Abstract
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882
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416
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The analytical configurationinteraction calculation for the ground state of Helium is performed over two con figuration states：ls2 and ls2s.The results show that a 0.02938 Hartree correction to the ground state energy is obtained by add i ng ls2s configuration state.This calcu lation is suitable for the course of undergraduate quantum mechanics.
Barrier penetration time of black hole quantum tunneling
. 2011, 30(9): 18-18.
Abstract
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875
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484
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The black hole barrier penetration time in a curved space time is discussed.By supposing that the tunneling process is an instantaneous process,we get an emission spectrum of massive particles with the WKB approximation method.This spectrum denotes that the emission of the massive particle near the horizon satisfies the unitary theory in the quantum theory,and supports Parikh-Wilczek＇s conclusion.It is seen from reasonableness of our result that the quantum tunneling in the event horizon of a black hole should be an instantaneous process.
On the inertial force
. 2011, 30(9): 22-22.
Abstract
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665
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326
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A summary of articles about the inertial force published in this journal by the auther.
The mechanism of negative permeability derived from law of electromagnetic induction
. 2011, 30(9): 24-24.
Abstract
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1221
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1029
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Based on the definition of penneability,the mechanism of negative permeability is derived from law of electromagnetic induction by using the model of the metal split ring resonators comprised of the left-handed materials.
Study on capacity formula for a conductor of two tangent spheres
. 2011, 30(9): 26-26.
Abstract
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813
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656
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Owing to the capacity formula of two tangent conductor spheres being expressed by the series,the basic capacity formula of two tangent conductor spheres is restudied by using the method of mirror image for studying its concise expression result.A concise capacity formula is gained by applying the method of ＂balance zoom＂,the approximate formula is contrast with the accurate formula on three kinds of error according to the application of MATLAB software.The approximate formula is provided with high precision,it can become a common formula to use,the approximate formula has good function in general case.
Confocal elliptic capacitor and another method of calculating electric field and capacitance
. 2011, 30(9): 31-31.
Abstract
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792
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(237KB) (
334
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Based on another form of elliptic cylindrical coordinate system,we calculate the confocal elliptic capacitor electric field strength,electric potential and capacitance.They are expressed in the Cartesian coordinate system.
Determination of the atomic（ionic） ground state by using the coordinate method
. 2011, 30(9): 34-34.
Abstract
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836
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299
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By introducing the coordinate in the ms、ml coordinate system for the same group of electrons,the method of determining atomic（ionic） ground state with the electron coordinate is proposed and some examples are given.It is shown that the present method in comparison with old one has many distinct advantages such as clear principle,convenient use,easy grasp and correct answer.The results determining atomic（ionic） ground states for elements of 103 kinds are well in agreement with the reference [7].
Improvement of experimental apparatus for tension coefficient of liquid surface
. 2011, 30(9): 38-38.
Abstract
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920
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1217
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The present ring method of liquid surface tension,measuring the level of conditioning,shortcoming of the rings lifting devices are improved.The measure of the surface tension coefficient is added in the original instrument for liquid heating the liquid at different temperatures.The new experimental apparatus is more scientific and reasonable,easy to operate. Thus the experimental error is small,reproducible,and has promotional value.
Measurement of magnetic induction intensity by using force sensor and Ampere＇s law
. 2011, 30(9): 41-41.
Abstract
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721
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(587KB) (
512
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Magnetic induction intensity of magnetic field is measured by using si-resistance-strain sensor and Ampere＇s law.The measurement principle is introduced and used it to measure the magnetic field of permanent magnets.The experimental results show that the present method has some advantages,such as the error is small,easy operate as well as an important reference value for open experimental teaching.
Determination of the fast and slow axis of the mica plate with interference spectroscopy of the white light
. 2011, 30(9): 43-43.
Abstract
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1074
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(276KB) (
777
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The reflected light from the inner surface of the posterior side will interfere with the incidence light,when the white light irradiate to the mica plate.A fluted spectrum with different colors can be observed by using spectrometer.Changing the polarization direction of incident light,the difference of index at orthogonal optical axis of the mica plate can be rapidly determined upon the moving direction of the grooves since the birefringence,and then the fast and slow axis can be deduced.
X-ray pulsar-based autonomous navigationand relativistic astrophysics
. 2011, 30(9): 45-45.
Abstract
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627
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(474KB) (
467
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The X-ray pulsar-based autonomous navigation being researched by some country and the relation with relativistic astrophysics is introduced.
A study on lotus effect
. 2011, 30(9): 50-50.
Abstract
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861
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450
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Lotus effect is based on the superhydrophobicity which results from the micro-nano structure of the surface.A simple experimental configuration is constructed to analyze the shape of a water drop on superhydro-phobic surface.The image processing toolbor（IPT） in MATLAB can be utilized in dealing with the corresponding digital image.By fitting Young-Laplace equation of the drop with the assistance of Runge-Kutta method and Newton-Raphson method,the contact angle of the water drop is obtained with relatively high precision.According to this result,the difference in wetting properties between Wenzel state and Cassie state is analyzed qualitatively,and the self-cleaning ability related to sand particles in different sizes is also presented,which provides an especially convenient and intuitive method for understanding lotus effect.
Experimental research of giant magneto-impedance effect
. 2011, 30(9): 55-55.
Abstract
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794
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(254KB) (
372
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In order to investigate the impedance of Co-based amorphous wires as a function of applied magnetic field intensity and frequency,a self-made device for giant magneto-impedance effect is made by using common devices in laboratory.Comparing with electromagnetic explanation of impedance,the experimental results are good in agreenent with the theory.The rate of change of impedance is up to 80% under an external magnetic field of 10 mT and a driving frequency of 40 MHz.Derived from data-fitting,the permeability tends to decreasing immediately with an increasing intensity of magnetic field.
Effect of the load of crystalline silicon solar on the power
. 2011, 30(9): 58-58.
Abstract
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741
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(326KB) (
242
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Taking into account the load factors on the impact of silicon cells,the silicon open-circuit voltage of the battery UOC,load voltage UL are discussed for constraint of silicon cell output power.The output powers PL under different loads RL are calculated.The origin software is used to calculate the load when the output power reaches its maximum.The appropriate range of the load is given for three cases：the maximum,the stability and efficiency of output power.
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