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Table of Content
20 March 2008 Volume 27 Issue 3
著者文摘
The soft matter physics and its originatory De Gennes
. 2008, 27(3): 1-1.
Abstract
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1326
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A brief introduction of the scientific career and work of Prof. de Gennes, the Nobel prize of physics laureate in 1991, is given. Dr. de Gennes is the founder of the new discipline soft matter physics. The content, present state and meaning of the soft matter physics are given as well.
Equivalent moment of inertia of a torsion bar
. 2008, 27(3): 5-5.
Abstract
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941
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495
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The influence of moment of inertia of a torsion bar on oscillation of the torsion pendulum is researched , and a new concept of equivalent moment of inertia of a torsion bar is introduced. The torsion oscillation of a columniform bar is discussed and a mistake on the correlative problem is corrected else.
Gravitation in the special relativity and ＂submarine paradox＂
. 2008, 27(3): 9-9.
Abstract
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1102
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1025
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In the special theory of relativity, the simple expression of gravitation in the small region around earth is derived by considering the infinitude of plane with uniform density but actual earth. Using this expression, ＂submarine paradox＂ can easily be solved.
New approach to diagonalizing the Hamiitonian of 3D coordinate-momentum coupling harmonic oscillators
. 2008, 27(3): 11-11.
Abstract
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851
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918
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Constructing a unitary matrix for transformation of coordinates by means of quadratic form theory, the Hamiltonian of the 3D coordinate-momentum coupling harmonic oscillator is transformed into diagonalmatrix, it not only offer a general mathematic method for solving this kind of problems, but also have an active effect upon upgrading students＇ ability to solve physics problems by mathematical theory.
Forces of gradient laser and optical trapping
. 2008, 27(3): 14-14.
Abstract
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1017
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1212
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From the gradient force upon an electric dipole in non-uniform electromagnetic field, the magnitude of the optical gradient force on a dielectric microsphere in light field is proportional to the field gradience and the principle of a single beam gradient laser trapping a dielectric microsphere are derived.
Method to derive wave velocity on stretched string by momentum theorem
. 2008, 27(3): 16-16.
Abstract
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1104
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497
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The wave velocity of stretched string is derived by simple method of momentum theorem.
Obtaining the range of curves parameter in the equation of electric field lines induced by lined-up charges
. 2008, 27(3): 18-18.
Abstract
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835
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(219KB) (
390
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As for a system consisting of a number of linear distributed electric charges, a gradual adjustment algorithm is adopted to obtain the range of the curves parameter C in the equation of electric field lines.
Study of algorithm of overall response of RLC networks which have AC and DC sources
. 2008, 27(3): 21-21.
Abstract
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764
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595
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A new DC algorithm of large scale RLC networks which have DC and AC sources is introduced. This method doesn＇t need to make DC equivalent circuits. It only need change directly AC steady matrix parameter in formula of nodal analysis. This algorithm can not only get right DC parameters of large scale RLC networks, but can also acquire easily overall response by computer.
A general study on equivalent resistance of 2 × N-iaddered network
. 2008, 27(3): 25-25.
Abstract
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821
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624
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The basic structure of 2 × N-laddered network is presented and the equivalent resistance of the network is studied. By means of constructing a mathematical model, one general formula for the inlet resistance of 2 × N-laddered network, as well as one ultimate rule for the equivalent resistance are given.
Using geometrical method to calculate the gravitational deflection of light ray in the static spherically symmetric gravitational field
. 2008, 27(3): 27-27.
Abstract
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901
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(214KB) (
524
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There must be a similarity between the gravitational deflection and the optical deflection of light ray. The deflection angle appearing when starlight sweeps the sun is calculated using a kind of optical method. The result is according with classical literature.
Entropy of neutrino fields near Gibbons-Maeda black hole
. 2008, 27(3): 30-30.
Abstract
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743
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(257KB) (
554
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According to the spin in Gibbons-Maeda dilaton, having applied WKB approximation, the r-number wave （pkr） is obtained through the equation of neutrino fields spinned 1/2. Basing on it, using brick -wall method to calculating the free energy and the entropy of neutrino fields that near black hole, and having compared with the entropy of scalar fields, the main entropy of neutrino fields is found 7/8 times as much as the main entropy of scalar fields.
The numerical methods and graphical displays of the particles bound in one-dimensional square potential wells
. 2008, 27(3): 33-33.
Abstract
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1103
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(255KB) (
807
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With the numerical methods and graphical displays, the energy levels and normalized wave functions are given for the particle in one-dimensional asymmetrical finite potential wells. The results are accordant with those of infinite wells when the potential tends to infinite.
Squeezing in damping harmonic oscillator
. 2008, 27(3): 37-37.
Abstract
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697
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(200KB) (
401
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For one-dimensional damping harmonic oscillator, using the technique of intergration within an ordered product of operators, the time-evolution state of this time-dependent system is derived, which turns out to be a squeezed state.
The relationship study of the frequency and temperature of a variable bell using the PC
. 2008, 27(3): 39-39.
Abstract
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1154
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1041
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The relationship between the frequency and temperature of a variable bell is studied by computer.
Improvement of the instrument of measuring Young＇s modulus
. 2008, 27(3): 43-43.
Abstract
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1053
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(159KB) (
564
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The Experiment of measuring Young＇s modulus is one of the most important experiments in the course of experiments of university physics. With the guidance of teachers and longtime experimenting, the optical lever-a key component of the instrument of the experiment of measuring young＇s modulus-is improved, which thoroughly eliminates the hidden trouble that the optical lever is easy to drop and break.
Techniques of measuring low resistance using double ＂single bridge＂
. 2008, 27(3): 45-45.
Abstract
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830
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(209KB) (
570
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The principle and techniques of using double ＂single bridge＂ to measure any low resistance is introduced. Using skills can ensure the double ＂single bridge＂ method more simple and intuitionistic than traditional Kelvin bridge method of measuring low resistance.
Space, time and motion--On the special theory of relativity and its far-reaching scientific significance
. 2008, 27(3): 47-47.
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1300
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1244
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A review of the historical background of origins of the special theory of relativity is given. Next it points out that by critically examinating the physical significance of the concepts of spatial and temporal intervals based on a careful definition of the simultaneity of distant events, Einstein discovered that the concept of a universal or absolute time, on which Newtonian mechanics and the Galilean transformations between the coordinates of two inertial frames of reference are based, has to be abandoned, and instead he put forward new concepts and laws of relative space and time and new kinematics for all of physics based on two postulates, the relativity principle and the principle of the constancy of the velocity of light. It indicates that Einstein＇s new kinematics is the foundation of all laws of physics which continue to preserve their invariance and symmetry in all of uniform motion, and also the foundation of the existence of the causality in all the natural phenomena. Finally, the major constributions of STR to physics are presented.
Fabrication of fiber polarization rotator based on quantum geometric phase
. 2008, 27(3): 57-57.
Abstract
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1007
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(283KB) (
477
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Based on quantum geometric phase （also called Berry phase）, a new kind of fiber polarization rotator is proposed. According to this idea, a fiber polarization rotator is fabricated and the changed angles of the polarized plane of light is measnred. The experimental results agree qualitatively with the theoretical prediction. A phenomenological formula is given to understand the errors between the experimental data and the theory.
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