Loading...
NianQi Search
Quick Search
Advanced Search
Toggle navigation
Home
About Journal
Editorial Board
Instruction
History
Indexed in
Subscription
Contact Us
中文
Office
Office
Submission/Manuscript
Peer Review
Editor Work
Office Work
Editor-in-Chief
Journal
Just Accepted
Current Issue
Archive
Advanced Search
Most Read
Most Download
E-mail Alert
RSS
Wechat
Table of Content
20 March 2007 Volume 26 Issue 3
著者文摘
The motion of a simple pendulum with varying length coupled with a vertical motion
. 2007, 26(3): 1-1.
Abstract
(
613
)
PDF
(339KB) (
383
)
Related Articles
|
Metrics
The motion of a simple pendulum with varying length coupled with a vertical motion is investigated, the second-order differential equation set of the motion is obtained in terms of plane polar coordinates. The accurate numerical solutions of the angular displacement, the length and its rate, and the path are given with the numerical method. To the approximation for small angle, the first-order analytical expression of the angular displacement and its rate, and the second-order analytical expression of the length and its rate are derived by the iteration method. The numerical results obtained by the analytical expressions are in consistence with that of accurate numerical solutions at the first some periods.
Approximate period formulae of a simple pendulum： comparison with MATLAB
. 2007, 26(3): 6-6.
Abstract
(
664
)
PDF
(257KB) (
760
)
Related Articles
|
Metrics
Using MATLAB, period of a simple pendulum without resistances is calculated accurately. Accordingly, more than ten approximate formulae are compared with the accurate one by charts and errors calculated with least square method.
The change of sublimation energy with temperature and pressure
. 2007, 26(3): 10-10.
Abstract
(
1525
)
PDF
(156KB) (
982
)
Related Articles
|
Metrics
The vatiations of the sublimation energy with temperature and pressure are discussed according tothe Clapeyron equation. It is indicated that the sublimation energy decreases linearly with increase of tempera-ture and pressure.
The quantum Berry＇s phase factor and its teaching
. 2007, 26(3): 12-12.
Abstract
(
857
)
PDF
(363KB) (
1038
)
Related Articles
|
Metrics
The phase problem of classical physics and quantum mechanics are reviewed, then geometrical Berry＇s phase and how to perform its teaching in quantum physics are discussed.
Rotational inertia of an arbitrary triangle plane and principal axes
. 2007, 26(3): 16-16.
Abstract
(
1084
)
PDF
(205KB) (
736
)
Related Articles
|
Metrics
The rotational inertia of an arbitrarily triangle uniform plane is calculated by a simple method. It is pointed out that principal axes can be deduced from the calculation.
The further study about the homogeneity of magnetic field of three coaxial coils
. 2007, 26(3): 18-18.
Abstract
(
561
)
PDF
(214KB) (
333
)
Related Articles
|
Metrics
According to analysis and numeral calculation, the homogeneity of vector field with an even centre is defined. Also the equal homogeneity surface of three coaxial coils are worked on different parameters and the best parameter which hadn＇t been obtained in other relative articles are given.
The application of the least-action principle in electricity
. 2007, 26(3): 21-21.
Abstract
(
613
)
PDF
(329KB) (
417
)
Related Articles
|
Metrics
Based on the least-action principle, few of problems in electricity is discussed by using the Lagrange multiple method, and some meaningful results are obtained.
Solvable condition for electrostatic problems using Gauss＇s law
. 2007, 26(3): 26-26.
Abstract
(
762
)
PDF
(207KB) (
491
)
Related Articles
|
Metrics
Solvable conditions for electrostatic problems using Gauss＇s law with direct integral method are presented, non-consummate expressions in the ordinary textbooks are appointed with counterexamples.
The values of βεi in partition function can be positive or negative
. 2007, 26(3): 29-29.
Abstract
(
487
)
PDF
(143KB) (
380
)
Related Articles
|
Metrics
Demonstrated that the values of βεi in partition function can be positive or negative.
An analysis of the factors influencing the Compton line
. 2007, 26(3): 31-31.
Abstract
(
669
)
PDF
(299KB) (
468
)
Related Articles
|
Metrics
The factors which influence the Compton line in Compton scattering are very complex. Those main factors are discussed, they include： the initial velocity can enlarge the changed wavelength; the bound energy could reduce the changed wavelength; the double Compton scattering and the Compton scattering which produces two photons change the changed wavelength, and the changed wavelength is uncertain, complex and continuous. At last the authors draw a conclusion and make a prospect for the research of the theory and its applications of Compton line and profile.
The kinetic energy of the photo-electron in photoelectric effect
. 2007, 26(3): 35-35.
Abstract
(
760
)
PDF
(310KB) (
983
)
Related Articles
|
Metrics
If we analyze the problem of the way in which the light wave goes into the superficial depth of metal with undulatory and solid state physics method, we find that the light wave can only reach the surface of the metal, and can not go into the interion. The result is that in the photoelectric effect, the photo-electron can only emerge from the surface of the metal without its emergence from the internal. Compared with the classical physics, using Fermi-Dirac statistics the photo-electron kinetic energy in metal is calculated, the result is that when photo-electron emerges from the surface of the metal, its initial kinetic energy is related only to the energy of the photon that it sucks up, and the work of emergence. The amount of the kinetic energy is equal each other when the photo-electron removes from the surface of the metal, with the movement in different directions. This conclusion corrects some wrong descriptions on optical and atomic physics in some teaching materials.
Determination of elastic hysteresis loop of metal wires by mean of optical lever method
. 2007, 26(3): 38-38.
Abstract
(
842
)
PDF
(232KB) (
910
)
Related Articles
|
Metrics
The elastic hysteresis loop of a super-elastic NiTi wire is determined by mean method. The results show method, which is proved to that the elastic hysteresis loop can be successfully measured by use be an efficient way to determine the elastic hysteresis loop of metal of optical lever of optical lever wires.
Using intensity periodic variation light signal survey speed of light and medium refractive index
. 2007, 26(3): 41-41.
Abstract
(
727
)
PDF
(211KB) (
596
)
Related Articles
|
Metrics
A new method to measure the speed of light and medium refractive index is presented. While a light propagation distance change cm order of magnitude it can be detected accurately change of propagation time. Using this method, the optical path difference can be detected accurately, if put medium to the light path. Therefore, it is a new method to measure medium refractive index.
Improvement on the measuring method of the light velocity
. 2007, 26(3): 44-44.
Abstract
(
774
)
PDF
(271KB) (
1491
)
Related Articles
|
Metrics
The method of velocity of light measuring with the CG- Ⅲ of light velocity apparatus is im-proved, the measuring accuracy is increased significantly.
The experiment ability of students
. 2007, 26(3): 46-46.
Abstract
(
453
)
PDF
(259KB) (
660
)
Related Articles
|
Metrics
The way of physical thought is stressed in experiment teaching.
Lawrence＇s researches on cyclotrons
. 2007, 26(3): 49-49.
Abstract
(
599
)
PDF
(516KB) (
1034
)
Related Articles
|
Metrics
Ernest Orlando Lawrence＇s biography and his major contribution in physics are outlined. The epoch background and the process of inventing cyclotron are reviewed. The working theory of the cyclotron is described. And the development of cyclotron is also referred. Finally, the reasons for his success is explored.
On digitized teaching of mechanical waves
. 2007, 26(3): 55-55.
Abstract
(
431
)
PDF
(383KB) (
341
)
Related Articles
|
Metrics
Taking mechanical waves as an example, we introduce the variation and advance in physics teaching induced by digitized teaching. Teaching digitization enriches the teachable capacity and the structural integrity of traditional wave knowledge. It especially enhances the practical ability for students to investigate waves and extends the researchable domains.
Just Accepted
