//m.getgobooth.com/ 必威体育下载 daily 15 2024-09-05 15:36:24 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-09-05 15:36:24 zh Copyright ©Acta Physica Sinica All Rights Reserved. 京ICP备05002789号-1 Address: PostCode：100190 Phone: 010-82649829，82649241,82649863 Email: apsoffice@iphy.ac.cn Copyright ©Acta Physica Sinica All Rights Reserved apsoffice@iphy.ac.cn 1000-3290 //m.getgobooth.com/en/article/doi/10.7498/aps.11.371 Author(s): LI YU-CHANG <br/><p>In this paper, a method of superposition in given for the determination of approximate stress function of prisin with small hole in torsion. The approximate stress function consists of two parts. The first part is the solution of torsion problem for a simply connected region bounded by the exterior boundary of the given prism. The second part is the solution of Von-Neumann problem in the exterior region of the small hole.The boundary value of second part on the small hole is determined so that the superposition of these two solution gives free boundary condition on the surface of hole. It can be shown that the effect of second solution are concentrated in around the neighbourhood of the small hole.</p> <br/>Acta Physica Sinica. 1955 11(5): 371-378. Published 1955-05-20 Author(s): LI YU-CHANG <br/><p>In this paper, a method of superposition in given for the determination of approximate stress function of prisin with small hole in torsion. The approximate stress function consists of two parts. The first part is the solution of torsion problem for a simply connected region bounded by the exterior boundary of the given prism. The second part is the solution of Von-Neumann problem in the exterior region of the small hole.The boundary value of second part on the small hole is determined so that the superposition of these two solution gives free boundary condition on the surface of hole. It can be shown that the effect of second solution are concentrated in around the neighbourhood of the small hole.</p> <br/>Acta Physica Sinica. 1955 11(5): 371-378. Published 1955-05-20 AN APPROXIMATE SOLUTION OF TORSION PROBLEM OF PRISM WITH SMALL HOLE LI YU-CHANG 1955-05-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1955 11(5): 371-378. article doi:10.7498/aps.11.371 10.7498/aps.11.371 Acta Physica Sinica 11 5 1955-05-20 //m.getgobooth.com/en/article/doi/10.7498/aps.11.371 371-378 //m.getgobooth.com/en/article/doi/10.7498/aps.11.379 Author(s): TZE YUNC-KWEI, SCHAW TA-CHEN <br/><p>A new type of simple electronic timer and its operational principle are described. The method and circuits of calibration are explained. The experimental results are tabulated and plotted in comparison with calculated values. Finally, discussions on the circuit, its accuracy, range of operation and applications are presented.</p> <br/>Acta Physica Sinica. 1955 11(5): 379-386. Published 1955-05-20 Author(s): TZE YUNC-KWEI, SCHAW TA-CHEN <br/><p>A new type of simple electronic timer and its operational principle are described. The method and circuits of calibration are explained. The experimental results are tabulated and plotted in comparison with calculated values. Finally, discussions on the circuit, its accuracy, range of operation and applications are presented.</p> <br/>Acta Physica Sinica. 1955 11(5): 379-386. Published 1955-05-20 A SIMPLE ELECTRONIC TIMER TZE YUNC-KWEI, SCHAW TA-CHEN 1955-05-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1955 11(5): 379-386. article doi:10.7498/aps.11.379 10.7498/aps.11.379 Acta Physica Sinica 11 5 1955-05-20 //m.getgobooth.com/en/article/doi/10.7498/aps.11.379 379-386 //m.getgobooth.com/en/article/doi/10.7498/aps.11.387 Author(s): KE TING-SUI, WANG CHI-MEN <br/><p>Internal friction peaks asscciated with the presence of carbon in several types of f.c.c. alloy-steel (18/8 type stainless steel and high manganese steel) have been observed from measurements with a torsion pendulum. The temperature for maximum internal friction lies between 200-300℃with a frequency of vibration of about I cycle per second. The height uf the peak rises and the position of the peak shifts to a lower temperature with an increase of the carbon content. When the amount of carbon in solid solution is reduced by tempering the specimen at an elevated temperature, the height of the peak lowers and the peak shifts to a higher temperature. A comparison of the activation energy and the diffusion ccefficients determined by internal friction methods with those measured in conventional macro-diffusion experiments reveals that the observed internal friction peak is associated with the stress-indused diffusion of carbon in these face-centered cubic steels.Internal friction peaks associated with the stress-induced diffusion of carbon in a Ni-Al alloy and in pure nickel have also been observed. These experiments show that the appearance of an internal friction peak associated with the diffusion of carbon in f.c.c. metals may be a general phenomenon.</p> <br/>Acta Physica Sinica. 1955 11(5): 387-402. Published 1955-05-20 Author(s): KE TING-SUI, WANG CHI-MEN <br/><p>Internal friction peaks asscciated with the presence of carbon in several types of f.c.c. alloy-steel (18/8 type stainless steel and high manganese steel) have been observed from measurements with a torsion pendulum. The temperature for maximum internal friction lies between 200-300℃with a frequency of vibration of about I cycle per second. The height uf the peak rises and the position of the peak shifts to a lower temperature with an increase of the carbon content. When the amount of carbon in solid solution is reduced by tempering the specimen at an elevated temperature, the height of the peak lowers and the peak shifts to a higher temperature. A comparison of the activation energy and the diffusion ccefficients determined by internal friction methods with those measured in conventional macro-diffusion experiments reveals that the observed internal friction peak is associated with the stress-indused diffusion of carbon in these face-centered cubic steels.Internal friction peaks associated with the stress-induced diffusion of carbon in a Ni-Al alloy and in pure nickel have also been observed. These experiments show that the appearance of an internal friction peak associated with the diffusion of carbon in f.c.c. metals may be a general phenomenon.</p> <br/>Acta Physica Sinica. 1955 11(5): 387-402. Published 1955-05-20 INTERNAL FRICTION PEAKS ASSOCIATED WITH THE STRESS-INDUCED DIFFUSION OF CARBON IN FACECENTERED CUBIC ALLOY-STEELS AND METALS KE TING-SUI, WANG CHI-MEN 1955-05-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1955 11(5): 387-402. article doi:10.7498/aps.11.387 10.7498/aps.11.387 Acta Physica Sinica 11 5 1955-05-20 //m.getgobooth.com/en/article/doi/10.7498/aps.11.387 387-402 //m.getgobooth.com/en/article/doi/10.7498/aps.11.403 Author(s): KE TING-SUI, TSIEN CHIH-TSIANG, KAREL MISEK <br/><p>It is well-known that the stress-induced rotation of the magnetic domains in nickel gives rise to an internal friction peak (when internal friction is plotted as a function of temperature of measurement). An internal friction peak associated with the presence of carbon in nickel was recently observed in our laboratory. In this paper are described further experiments which demonstrate conclusively that this new internal friction peak is not connected with ferromagnetism of nickel but depends upon the amount of carbon in solid solution in nickel. More accurate determinations of the activation energy associated with this internal friction peak show that this activation energy is indeed very close to the activation energy for the diffusion of carbon in nickel. These experiments thus show that the new internal friction peak is associated with the stress-induced micro-diffusion of carbon in nickel.A brief discussion on the mechanism of this internal friction peak in terms of the existence of holes in the crystal lattice of nickel is given.</p> <br/>Acta Physica Sinica. 1955 11(5): 403-410. Published 1955-05-20 Author(s): KE TING-SUI, TSIEN CHIH-TSIANG, KAREL MISEK <br/><p>It is well-known that the stress-induced rotation of the magnetic domains in nickel gives rise to an internal friction peak (when internal friction is plotted as a function of temperature of measurement). An internal friction peak associated with the presence of carbon in nickel was recently observed in our laboratory. In this paper are described further experiments which demonstrate conclusively that this new internal friction peak is not connected with ferromagnetism of nickel but depends upon the amount of carbon in solid solution in nickel. More accurate determinations of the activation energy associated with this internal friction peak show that this activation energy is indeed very close to the activation energy for the diffusion of carbon in nickel. These experiments thus show that the new internal friction peak is associated with the stress-induced micro-diffusion of carbon in nickel.A brief discussion on the mechanism of this internal friction peak in terms of the existence of holes in the crystal lattice of nickel is given.</p> <br/>Acta Physica Sinica. 1955 11(5): 403-410. Published 1955-05-20 ON THE INTERNAL FRICTION PEAK ASSOCIATED WITH THE PRESENCE OF CARBON IN NICKEL KE TING-SUI, TSIEN CHIH-TSIANG, KAREL MISEK 1955-05-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1955 11(5): 403-410. article doi:10.7498/aps.11.403 10.7498/aps.11.403 Acta Physica Sinica 11 5 1955-05-20 //m.getgobooth.com/en/article/doi/10.7498/aps.11.403 403-410 //m.getgobooth.com/en/article/doi/10.7498/aps.11.411 Author(s): LIN WEI-GUAN <br/><p>In frequency modulation system the change of the percentage modulation affects the bandwidth of the transmitted signal. Outside the critical sideband the amplitude of all the higher order sidebands is a positive decreasing function of the order of the sidebands. In this paper we give an approximate determination of amplitude of this critical sideband as given by equation (8) or fig. (2); given also are the approximate magnitude of any side band above the critical and the ratio of the amplitude of any sideband above the critical to that of the critical, equation (11). By means of these two equations we can design the bandwidth of the transmission system by retaining a certain number of significant sidebands above the critical.</p> <br/>Acta Physica Sinica. 1955 11(5): 411-420. Published 1955-05-20 Author(s): LIN WEI-GUAN <br/><p>In frequency modulation system the change of the percentage modulation affects the bandwidth of the transmitted signal. Outside the critical sideband the amplitude of all the higher order sidebands is a positive decreasing function of the order of the sidebands. In this paper we give an approximate determination of amplitude of this critical sideband as given by equation (8) or fig. (2); given also are the approximate magnitude of any side band above the critical and the ratio of the amplitude of any sideband above the critical to that of the critical, equation (11). By means of these two equations we can design the bandwidth of the transmission system by retaining a certain number of significant sidebands above the critical.</p> <br/>Acta Physica Sinica. 1955 11(5): 411-420. Published 1955-05-20 APPLICATION OF THE APPROXIMATE EVALUATION OF BESSEL FUNCTIONS TO FREQUENCY MODULATION SYSTEM LIN WEI-GUAN 1955-05-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1955 11(5): 411-420. article doi:10.7498/aps.11.411 10.7498/aps.11.411 Acta Physica Sinica 11 5 1955-05-20 //m.getgobooth.com/en/article/doi/10.7498/aps.11.411 411-420 //m.getgobooth.com/en/article/doi/10.7498/aps.11.421 Author(s): WANG KAN-CHANG, CHEN JEN-CHI, LEE MIN <br/><p></p> <br/>Acta Physica Sinica. 1955 11(5): 421-424. Published 1955-05-20 Author(s): WANG KAN-CHANG, CHEN JEN-CHI, LEE MIN <br/><p></p> <br/>Acta Physica Sinica. 1955 11(5): 421-424. Published 1955-05-20 ELECTRON-PHOTON SHOWERS IN LEAD WANG KAN-CHANG, CHEN JEN-CHI, LEE MIN 1955-05-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1955 11(5): 421-424. article doi:10.7498/aps.11.421 10.7498/aps.11.421 Acta Physica Sinica 11 5 1955-05-20 //m.getgobooth.com/en/article/doi/10.7498/aps.11.421 421-424 //m.getgobooth.com/en/article/doi/10.7498/aps.11.425 Author(s): TIEN QU <br/><p></p> <br/>Acta Physica Sinica. 1955 11(5): 425-428. Published 1955-05-20 Author(s): TIEN QU <br/><p></p> <br/>Acta Physica Sinica. 1955 11(5): 425-428. Published 1955-05-20 ON THE MAGNETIC MOMENT OF NEUTRON TIEN QU 1955-05-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1955 11(5): 425-428. article doi:10.7498/aps.11.425 10.7498/aps.11.425 Acta Physica Sinica 11 5 1955-05-20 //m.getgobooth.com/en/article/doi/10.7498/aps.11.425 425-428