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Table of Content
20 August 2007 Volume 26 Issue 8
著者文摘
Talking about Brewster angle of monopodium
. 2007, 26(8): 1-1.
Abstract
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890
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837
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The problem of the angle of incidence on the surface of a monopodium whose optical axis is discretional （Brewster＇s angle） is studied when the reflected rays is totally perpendicular to the plane of incidence. The Brewster angle is analysed when optical axis is discretional, then the paper gives the conclusion is obtained when optical axis is perpendicular to the plane of incidence by using a set of simple calculating method, the incorrectness of some papers is pointed out
The discussion of elements＇relations in one-dimensional transmission matrix
. 2007, 26(8): 6-6.
Abstract
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841
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(208KB) (
367
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The different solutions of elements＇ relations in one-dimensional transmission matrix are discussed. Firstly,if V （x） = V （ - x） is considered, the general method is introduced to find out the relations among elements in transmission matrix. Secondly, we especially discussed how to use the symmetry of wave func- tion to solve the same question. As a result, the later method is more simple and succinct. It also can help us to understand the whole physical process. If the similar situations are confronted, the second method can be used to work out the question. It is more helpful than the others.
Time evolution of atomic pulation inverse of binomial photon field and negative binomial photon field interacting with two coupling atoms via intensity-dependent coupling
. 2007, 26(8): 9-9.
Abstract
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653
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(271KB) (
307
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The time-evolution of atomic population inverse of binomial photon field and negative binomial photon field interacting with two coupling atoms via intensity-dependent coupling is investigated. The influences of interaction between atoms and the initial state of photon field on the atomic population inverse are discussed.
The expansion of orthogonal complete set and transformation operator in teleportation
. 2007, 26(8): 13-13.
Abstract
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788
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(212KB) (
320
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In teleportation,the system state is linear combination of Bell bases and transformation. If transformation operators have inverses operators, the teleportation can be realized by performing a inverse transformation. The relation of the determinant of transformation operators with entanglement measure is obtained.
Mechanical analysis on the distance of shot put flying and its influential factors
. 2007, 26(8): 15-15.
Abstract
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877
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(376KB) (
355
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By analyzing the relationship between the distance of shot put flying and its influential factors which is based on sliding shot put, the influence is discussed in details that the independent mechanical variables, which determine the distance of shot put flying, effect the distance of shot put flying; at the same time the right physical meaning of optimum angle out of strength and some significant conclusions are pointed out.
The best projecting angle of non-ideal projectile
. 2007, 26(8): 20-20.
Abstract
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1017
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PDF
(216KB) (
964
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It just presents the best projecting angle of the projectile with resistance, start and end at different level aided by numerical calculation.
Analysis methods of static electromagnetic field problems
. 2007, 26(8): 23-23.
Abstract
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863
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(363KB) (
1210
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A few methods for calculating electromagnetic field are introduced-analytical method, finite difference method, finite element method. A static electromagnetic problem is taken as an example. Numerical solution are achieved by MATLAB finite difference program which programed by the author and ANSYS plat- form. By comparing numerical solution and anlytical solution, the conclusion that the numerical solution is satisfied for engineering are achieved. How to reduce the computer memory and redundant data are discussed as well.
Discussion of the interaction between permanent magnet and moving non-ferromagnetic conductor
. 2007, 26(8): 27-27.
Abstract
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1045
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(461KB) (
925
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The interaction between the permanent magnet and the moving conductor is analyzed in detail, and a novel noncontact driving mode is discovered. A magnet can be driven to rotate around its central axis by moving a non-ferromagnetic conductor under it. From the molecular current viewpoint, an analytic expression exactly describing the magnetic field distribution of a rectangular permanent magnet is derived from the Blot - Savart＇s law. And the force on the permanent magnet is calculated quantitatively when the conductor is moving five millimeters under the permanent magnet. Finally a new explanation for magnetic levition force is proposed and the inexplicit explanation on the principle of magnetic levitation experimental apparatus by PASCO company is clarified and the reason is presented for that the lift phenomena can only be observed in constrained case.
The supersymmetry WKB approximate and eigenvalue problems
. 2007, 26(8): 33-33.
Abstract
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857
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(256KB) (
451
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The energy eigenvalues of three-dimensional harmonic oscillator and hydrogen atom are solved by using supersymmetric WKB approximate method ; the eigenvalue of angular momentum and angular dimension of non-central potential are gained by applying SWKB theory to differential equation of second order including an- gular coordinate.
A study of an electrified bubble
. 2007, 26(8): 37-37.
Abstract
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644
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PDF
(219KB) (
474
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An electrified bubble is studied, a relation between the electricity carried and the radius increased and the energy change of the system are obtained
Significant digits error analysis and the choice of experimental conditions
. 2007, 26(8): 39-39.
Abstract
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794
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PDF
(227KB) (
409
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significant digits and error are analyzed with oil-drop and galvanometer experiments, it indicates that the quantization of charge may not be justified if we did not choose the experimental condition by significant digits and error analysis, and large errors and even mistakes may be caused if the matching of significant digits between different quantities was ignored or bad data processing method is chosen. The conclusions are proved by experimental data.
On the criterion of connecting the ammeter inside or outside while using Volt-Ampere law to measure a resistance
. 2007, 26(8): 42-42.
Abstract
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769
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(145KB) (
529
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The criterion of connecting the ammeter inside or outside while using Volt-Ampere law to measure a resistance in physical experiment is discussed
Determination of the cardinal points of a compound optical system using secondary imagery method
. 2007, 26(8): 44-44.
Abstract
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797
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PDF
(241KB) (
708
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The theory and method of using secondary imagery method to determine the cardinal point of compound optical system are introduced. The precision of this method is very high.
The real-time measurement of the tuning fork forc vibrations by computer
. 2007, 26(8): 46-46.
Abstract
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715
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PDF
(287KB) (
470
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The forced vibration of a tuning fork is studied,an experimental device is constructed and the dependence of resonance frequency to the mass of the arms of the fork is measured, the real-time measurement is realized.
Measurement and investigation of the elementary physical characteristics of the LED -Introduction to an investigational physical experiment related to energy saving
. 2007, 26(8): 49-49.
Abstract
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808
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PDF
(310KB) (
775
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A physical experiment related to energy saving is introduced, which studies the elementary physical characteristics of LED, and helps the students understand the principle of light emission, properties and measurement of LED.
The deflection angle when a light goes over through the surface of a star
. 2007, 26(8): 53-53.
Abstract
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1052
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(370KB) (
469
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When a light goes over through the surface of a star,there will be a deflection angle in two kinds of results. One is derived from Newton＇s gravitation theory, and the other is derived from Einstein＇s theory of general relativity. The latter is twice of the former. As for the Sun,the nearest star to the human,the numerical results are 0. 875＂ and 1.75＂. Here is the computing progress in detail. It is the due time to proof-test the inclusion when a solar eclipse is appearing. By far all the experimental information is in agreement with the general relativity.
A study of college physics teaching with local national features
. 2007, 26(8): 58-58.
Abstract
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597
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(344KB) (
501
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A study fruit of the college physics teaching in the institutes of higher learning in areas inhabited by minority nationalities is introduced. The compile of bilingual （Chinese and minority national language） textbook for minority national students, and its relative syllabus and the arrangement of contents are discussed.
A teaching model of shift and develops based on foundation knowledge
. 2007, 26(8): 61-61.
Abstract
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679
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PDF
(260KB) (
386
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A new teaching model of shift and develops based on foundation knowledge is introduced. It is per formed by researching special topics.
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