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Table of Content
20 November 2013 Volume 32 Issue 11
著者文摘
Performance characteristics of a weak-dissipation Carnot heat engine
. 2013, 32(11): 1-1.
Abstract
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730
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424
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Based on the weak dissipation assumption, the expressions for the power output and efficiency of a Carnot heat engine are obtained and the optimal relation between the power output and the efficiency is derived. The general performance characteristics of the irreversible Carnot heat engine are discussed. Some of the important results appearing in the literature are conveniently deduced.
Quantum bound-state solution of the initial value problem
. 2013, 32(11): 4-4.
Abstract
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760
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(435KB) (
525
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The one-dimensional quantum bound-state solution of the initial value problem is studied. A lemma and an associated inference are derived, as well as a rational formula for choosing initial conditions in the classically forbidden area is obtained. The ＂shooting method＂ is used to determine the energy of eigenvalues and eigenfun- tions. The method is simple and intuitive, and can be extended to solve the radial wave function in the multidimen- sional space.
Understanding the Legendre transform
. 2013, 32(11): 8-8.
Abstract
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2069
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(347KB) (
907
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The Legendre transform is an important tool in theoretical physics, which plays a critical role in classical mechanics, statistical mechanics, and thermodynamics. Yet, in undergraduate courses, the power of mo- tivation and elegance of the method are often missing, unlike the treatments frequently enjoyed by the Fourier trans- form. We modify the formal mathematics of the Legendre transform of multivariate function, resulting in manifestly symmetric equations, deriving the relation between the Legendre transform and the partial differentiation. Then we bring the results in the classical mechanics, derive canonical equation, and bring the results in the thermodynamic, as well as thermodynamic functions and Maxwell relation are also derived.
Magnetic moment of solenoid under unideal condition
. 2013, 32(11): 11-11.
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1069
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(294KB) (
440
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The magnetic moment of solenoid under unideal condition is a non-plane moment. The formula of non-plane magnetic moment is applied to deduce some other cases. Then the results are discussed.
Calculating the rotation inertia of homogeneous thin plate with arbitrary closed curvilinear boundary by the Green formula
. 2013, 32(11): 15-15.
Abstract
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862
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(246KB) (
622
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A general formula for calculating the homogeneous thin plate rotation inertia with arbitrary closed curvilinear boundary is derived. We construct integrand group and change double integral into the Green formula, and then some infrequent examples are calculated by this formula tersely in the textbook.
Solving the electric fields involving infinitely long charged lines by Green＇ s equivalent layer theorem
. 2013, 32(11): 18-18.
Abstract
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794
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(316KB) (
532
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The relevant literature in electrostatic field involving infinitely long charged line and unlimited long charged cylinder conductors is summarized, various models are attributed to the electric field model of infinitely long parallel charged lines. By using Green＇ s equivlent layer theorem, the potetial and electric field distributions of the other related models are given.
Calculation of confocal elliptic cylindrical cable magnetic field by magnetic scalar potential
. 2013, 32(11): 22-22.
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612
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(328KB) (
435
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In combined with the the definition of elliptic cylinder coordinate system form, we use the magnetic scalar potential Ampere loop theorem to calculate the confocal elliptic cylindrical cable produce internal and ex- ternal magnetic field.
Explanation of what happens when a balloon is put in liquid nitrogen
. 2013, 32(11): 26-26.
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1544
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485
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An experiment of a balloon being put in liquid nitrogen has been done balloon will not implode or explode or shrink to a small balloon, but be crashed to flat explanation of what had happened in this experiment. The results showed that the instead. We gave an explicit
A new type instrument of simulating measure for electrostatic field
. 2013, 32(11): 30-30.
Abstract
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709
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(292KB) (
438
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The simulating measure of electrostatic field is an important basic experiment, but the present in- strument is difficult to meet the measure demand, leads to a large error of experiment result, We present a development for instrument, which has large measure squareness flume, lever regulate nut, and rail under-draught electrode structural etc. It has been shown that the instrument can improve accuracy of determination measurement, add experiment content, and easy to operation.
The designed experiment research in resistance sensor＇s the validation and application of the physical principle
. 2013, 32(11): 33-33.
Abstract
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707
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(391KB) (
792
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As examples of three different applications of resistance sensors, based on the students＇ innovative designed experiments, we verify sensor＇s physical principle and engineering application. The developing implementation mode of designed experiment research in the student is introduced in detail. According to the principle of physics and electronic technology foundation under the guidance of the teacher, students start from the data access. plan designed experiments independently, complete the device that verifies the physical principle of resistance sensor and designs the sensor in the engineering application, to make students better to grasp the theoretical knowledge in physics, improve the students＇ application ability of physical knowledge, independent thinking and scientific re- search innovation ability.
Application of organic magnetic-field effect in the physical experiment teaching
. 2013, 32(11): 37-37.
Abstract
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495
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(409KB) (
368
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We introduce the results of magnetic-field effects in the organic light-emitting diodes into the phys- ical experiment teaching. The backgroud, principle, method and content of the organic magnetic-field effect exper- iment are described in detail. Some matters needing attention in the process of experimental teaching are also illus- trated briefly.
Research and application of all-fiber mixing technology used for velocity measurement system
. 2013, 32(11): 41-41.
Abstract
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753
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(387KB) (
423
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In order to measure the speed of high moving object and make it intuitive to visual, we use non- contact mixing technology to measure velocity. The light which from semiconductor laser is divided by coupler into two beams, then it hits onto the surface of variable motion object successively. The two beams of light produce Doppler frequency shift due to optical Doppler effect, and finally form mixing in the coupler＇s exit. After mixing, it forms a beat frequency signal, then the signal is detected by APD, thus we can get a perfect voltage signal after it get through the amplification filter circuit, which contains the speed in formation. After that, the signal which through ARM is used for FFT analysis processing, eventually the speed curve is directly displayed in the LCD screen, so the velocity measurements of the high speed moving object come into realize.
Analysis and simulation on the structure of electromagnetic throwing device
. 2013, 32(11): 45-45.
Abstract
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768
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(829KB) (
468
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According to the technical parameters of existing throwing device, the current development of thro- wing device is firstly introduced, a new method is also put forward by using electromagnetic force for the throwing device＇s power. By analying three classical methods of electromagnetic emission technique, the coil electromagnetic emission method is applied to the design of electromagnetic throwing device＇s structure. At last, by using the soft- ware COMSOL Multiphysics, the three basic structural parameters of electromagnetic throwing device are simulated and analysed, namely, wall thickness of projectile, aperture of projectile and the initial launch position of projectile. The structure set of electromagnetic throwing device is optimized.
Application of minimum energy principle to capacitance analysis and estimation
. 2013, 32(11): 51-51.
Abstract
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805
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(491KB) (
514
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This paper demonstrates the ＂principle of minimum energy＂ of a charged system and its corollary, which is applied to analysis and valuation of the conductor capacitance. Through the functional extreme value idea and charge distribution of the trial function, some properties of the capacitance and the valuation methods are given.
Theoretical and experimental research on the process of optical pump magnetic resonance
. 2013, 32(11): 55-55.
Abstract
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889
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(377KB) (
842
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A theoretical model about the process of optical pump magnetic resonance resonance has been established by analyzing the atomic radiative transition process and transition rate. On the basis ,the relationship between signal amplitude of optical pump magnetic resonance and the amplitude of sweep field has been derived and compared with the experimental results. It is found that theoretical calculation is in agreement well with the experimental results, thus,the experiment is of great significance on the deep understanding of the optical pump magnetic resonance process.
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