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Table of Content
20 February 2014 Volume 33 Issue 2
著者文摘
2013 Nobel prize in physics and modern particle physics
. 2014, 33(2): 1-1.
Abstract
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760
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I Will briefly review what the Higgs mechanism is and how this mechanism was discovered. Meantime the key issues of modern particle physics will also be presented.
The choice of trial wave function in quantum mechanics
. 2014, 33(2): 6-6.
Abstract
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1151
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753
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We discuss the problems of choosing the trial wave function get the upper limit of energy for system in the ground state. Some examples
2 Investigation on minimum Gibbs function reduced theorem in diffusion process
. 2014, 33(2): 9-9.
Abstract
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809
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447
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The minimum Gibbs function reduced theorem of irreversible diffusion process is deduced. The minimum Gibbs function reduced theorem is compared with the minimum entropy produce theorem of diffusion process.
Study of symmetry classification for energy bands in fluorographene
. 2014, 33(2): 12-12.
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836
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539
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Based on the first principle calculation of the density functional theory, we have accurately calculated the energy band structure of fluorographene. Then for a given point group of crystal structure, the valence bands and two lowest conduction bands are classified by symmetry according to compatibillity relation between the irreducible representations at the special points and those along the various lines of symmetry meeting at that point. Studying on the degeneracy of high symmetry point can provide a theoretical basis for the future study of energy structured split- ting deduced by the external field.
Analysis of the collision of two identical elastic bodies
. 2014, 33(2): 15-15.
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914
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787
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The collision process of two identical elastic spheres is theoretically investigated. The maximum impact force, the average impact force and the impact time are studied based on the theoretical analysis. Subsequently, the conclusions are popularized in the collision of a sphere with semi-infinite block. The numerical simulations for the collison of two identical elastic spheres ,as well as collisions between elastic spheres with different radii and semi-infinite block, are performed. The mumerical results are in well agreement with the theoretical and experimental results.
The collision problem of traction movement
. 2014, 33(2): 19-19.
Abstract
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786
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900
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Based on the characteristics of deformation and energy transformation in a collision and the concept of elasticity degree k,the collusion of traction is analyzed. The results of the collusion in different conditions are discussed,the coefficient of restitution e of the traction collision is defined.
Discussion on importance of symmetry to physics from ＂multi-dogs going after＂ problem
. 2014, 33(2): 22-22.
Abstract
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615
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1005
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The analytical solution of ＂multi-dogs going after＂ problem is found by using the symmetry, and the importance of symmetry analysis to physics is further discussed.
Discussion on slingshot effect
. 2014, 33(2): 26-26.
Abstract
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1111
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586
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The sample of slingshot effect in textbook of 《Fundamental Physics of University》 is discussed. The questions such as projection distance, probe trajectory and escape direction are analyzed and discussed theoretically, and a more comprehensive conclusion is presented.
Equivalent R and C of 7×n-Rectangular network and two conjectures of m×n network
. 2014, 33(2): 28-28.
Abstract
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753
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848
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Study of the equivalent resistance formulae for arbitrary m×n-order resistance network is a difficult problem. The equivalent resistance and capacitance of 7 ×n-rectangular network are investigated in this paper. We built a quaternion matrix equation and proposed the method of matrix transformations in terms of the network analysis. A brief equivalent resistance formula is proposed, meanwhile a equivalent resistance of infinite networks is gained. Using the inverse mapping relation between capacitance parameters and resistance parameters, the equivalent capacitance formula is given for the 7 ×n-rectangular capactitance network. Two conjectures of the equivalent resistance and capacitance formulas for the random m×n-rectangular network are proposed according to the architectural feature of a series of formulas of equivalent resistance which achieved before. Some new trigonometric identities are obtained when the result is compared with others.
On the concepts of mass, inertia and relative velocity in special relativity
. 2014, 33(2): 35-35.
Abstract
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872
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1004
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Some basic concepts in special relativity, including two language systems about mass, inertial, principle of physical independence of forces, relative velocity and velocity addition, are discussed. It is advocated that one uses proper mass as the only kind of mass.
Discussion on ＂acceleration whether on impact of the time dilation effect＂ within the context of the special relativity
. 2014, 33(2): 39-39.
Abstract
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1079
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803
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The spacercraft（particle） took off from the ground to return to the ground the whole bell slow effect is discussed by three-dimensional acceleration effect. It is concluded that the bell slow effect depends only on the relative speed of movement, without any acceleration. No matter how experienced acceleration, from the whole earth standard bell spacecraft standard bell total travel time ratio remaines unchanged.
Analysis and measurement of the momentum of the inertia of a rotating disk under frictional torque
. 2014, 33(2): 41-41.
Abstract
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726
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(384KB) (
562
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The influence of a frictional torque to the rotation of a rigid disk is analyzed. The equation of the disk＇ s rotation movement are given. Based on these analyses, the experimental research of the disk＇ s rotating is carried out by using video capture and Tracker software. The experimental results confirm the theoretical analyses and give the momentum inertia of the disk in a relatively high precision.
The equipment of Young＇ s modulus measurement with GMR sensor
. 2014, 33(2): 45-45.
Abstract
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1149
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617
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The experimental installation which is composed of giant magnetic resistor sensor,with a potentiometer and tow piece of little magnetic steels,can be used to measure accurately a mini-displacement in physical exper- iments. It is applied to measure Young＇ s modulus and the experimental result indicates that the way of measurement with giant magnetic resistor sensor is much simpler and more precise compared with the optical lever method.
Measuring the voltage-current characteristic of nonlinear element with comparison method
. 2014, 33(2): 49-49.
Abstract
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1262
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756
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The comparison method of ＂voltage ratio equaling resistance ratio＂ is used to measure the voltagecurrent characteristic of light emitting diode. The experimental results indicate that the method of ＂voltage ratio equaling resistance ratio＂cn be used to simply and conveniently measure the voltage-current characteristic of nonlinear element.
Magnetism controlled liquid crystal birefringence experiment
. 2014, 33(2): 51-51.
Abstract
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684
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420
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Using a specially-made magnetism controlled prismatic liquid crystal cell, a novel birefringence ex- periment system of physical optics is developed. On the experimental stages, the refractive angles are measured by a spectroscopy. The device is suitable for the teaching assistance of polarization and crystal optics. The experimental phenomena can be observed easily and the measurement is accurate and reliable.
Two-dimensional image reconstruction based on wide-field optical coherence tomography and its teaching investigation
. 2014, 33(2): 55-55.
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611
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440
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The principle of wide-field optical coherence tomography is described,and the relationship between imaging resolution and coherence length is studied. The system optical path can be adjusted fast and reliably according to Michelson interferometer and equal-thickness principle. Thue the follow-on experiments can be implemented. Finally a two-dimensional image is reconstructed by using step-8 phase-shifting method. In addition, WFOCT is introduced into college physics experiment,and it helps to understand the Michelson interferometer and improve the preliminary scientific research ability of students.
Simulating study of response of grease stain thickness in pipeline by γ-ray scattering method
. 2014, 33(2): 58-58.
Abstract
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626
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(359KB) (
544
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Using the cylinder-shaped paraffin to simulate grease stain in petroleum pipelines, the scattering experiments with 0. 662MeV γ-ray are performed to measure the response of grease stain thickness in pipeline full of oil or empty. For the empty cylinder-shaped paraffin, the scattered radiation intensity increases with the increasing thickness and shows a good linear sensitivity response which accords with the theoretical analysis. As the case of oil -containing paraffin cylinder, the scattered radiation intensity increases with the increasing thickness and tends to be stable;and there is good response still in the zone of small paraffin thickness.
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