//www.getgobooth.com/ 必威体育下载 daily 15 2024-08-20 10:33:40 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-08-20 10:33:40 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 //www.getgobooth.com/en/article/doi/10.7498/aps.20.947 Author(s): DAI YUAN-BEN <br/><p>For a class of nonlocal potentials, the S matrix element is proved to be analytic in the right half λ planeexcept at the poles.</p> <br/>Acta Physica Sinica. 1964 20(10): 947-953. Published 1964-05-05 Author(s): DAI YUAN-BEN <br/><p>For a class of nonlocal potentials, the S matrix element is proved to be analytic in the right half λ planeexcept at the poles.</p> <br/>Acta Physica Sinica. 1964 20(10): 947-953. Published 1964-05-05 THE ANALYTICITY IN THE COMPLEX ANGULAR MOMENTUM VARIABLE OF THE S MATRIX ELEMENT FOR A CLASS OF NONLOCAL POTENTIALS DAI YUAN-BEN 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 947-953. article doi:10.7498/aps.20.947 10.7498/aps.20.947 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.947 947-953 //www.getgobooth.com/en/article/doi/10.7498/aps.20.954 Author(s): HO YU-PING <br/><p>The semiclassical equations which describe the behaviours of three-level lasers were derived. The method of nonlinear mechanics was used to treat the electromagnetic oscillations coupled with the dipole moments of molecules. It is shown that when the pumping power is larger than the critical value, the amplitude of output oscillations is stable (corresponding to a stable equilibrium point in phase space), only if the homogeneous line width of molecules (1/T2) is larger than the damping width of the resonan-tor (q). The appearance of instability of output oscillations is due to the effect of coherence. Furthermore, a stable limit cycle was shown to appear when the above mentioned equilibrium point becomes unstable as qT2 increases. Therefore, it seems true that there is no limit cycle near the equilibrium point when it is stable. These results may account for the instability of amplitude of output oscillations observed by some authors in ruby lasers, and should be checked in detail with gas lasers.</p> <br/>Acta Physica Sinica. 1964 20(10): 954-969. Published 1964-05-05 Author(s): HO YU-PING <br/><p>The semiclassical equations which describe the behaviours of three-level lasers were derived. The method of nonlinear mechanics was used to treat the electromagnetic oscillations coupled with the dipole moments of molecules. It is shown that when the pumping power is larger than the critical value, the amplitude of output oscillations is stable (corresponding to a stable equilibrium point in phase space), only if the homogeneous line width of molecules (1/T2) is larger than the damping width of the resonan-tor (q). The appearance of instability of output oscillations is due to the effect of coherence. Furthermore, a stable limit cycle was shown to appear when the above mentioned equilibrium point becomes unstable as qT2 increases. Therefore, it seems true that there is no limit cycle near the equilibrium point when it is stable. These results may account for the instability of amplitude of output oscillations observed by some authors in ruby lasers, and should be checked in detail with gas lasers.</p> <br/>Acta Physica Sinica. 1964 20(10): 954-969. Published 1964-05-05 OUTPUT STABILITY OF LASERS HO YU-PING 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 954-969. article doi:10.7498/aps.20.954 10.7498/aps.20.954 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.954 954-969 //www.getgobooth.com/en/article/doi/10.7498/aps.20.970 Author(s): HSIEH HSI-TEH, CHEN HSIAO-SHEN <br/><p>Based on the general methods for the reduction of direct products of space group irreducible representations developed by Birman, a simpler method of finding the wave vector selection rules is derived. The method is applied here to the hexagonal close-packed and the wurtzite space groups. The coupling coefficients for the reduction of the direct products of two space group irreducible representations are given explicitly.</p> <br/>Acta Physica Sinica. 1964 20(10): 970-990. Published 1964-05-05 Author(s): HSIEH HSI-TEH, CHEN HSIAO-SHEN <br/><p>Based on the general methods for the reduction of direct products of space group irreducible representations developed by Birman, a simpler method of finding the wave vector selection rules is derived. The method is applied here to the hexagonal close-packed and the wurtzite space groups. The coupling coefficients for the reduction of the direct products of two space group irreducible representations are given explicitly.</p> <br/>Acta Physica Sinica. 1964 20(10): 970-990. Published 1964-05-05 SPACE GROUP SELECTION RULES HSIEH HSI-TEH, CHEN HSIAO-SHEN 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 970-990. article doi:10.7498/aps.20.970 10.7498/aps.20.970 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.970 970-990 //www.getgobooth.com/en/article/doi/10.7498/aps.20.991 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 991-1002. Published 1964-05-05 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 991-1002. Published 1964-05-05 TEOPия CBEPXпPOBOдиMOCTи TOHKOй METAлличECKOй nлЁHKи B CилbHOM MAГHUTHOM лOлE (II)——КpиTичECKOE MAГHиTHOE лOЛE CBEPXлPOBOлящEй ГцлЁKи 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 991-1002. article doi:10.7498/aps.20.991 10.7498/aps.20.991 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.991 991-1002 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1003 Author(s): ZHU YEI-ZHUNG, LEE TSE-CHING <br/><p>On the basis of the general expression of the scattering matrix between two particles with spin, derived by Jocob and Wick, with certain approximations we have analysed the experimental data of the angular distribution of the fission fragments from Th230,Th232,U234,U236, and U238, bombarded by neutron whose energy is in the region near the fission threshold. The results of this analysis show: (1) The angular distribution of the fission fragments, in the region near the threshold, can be explained by a few rotational bands (every band has a definite parity) above the saddle point. (2) These rotational bands are consistent with the asymptotic energy levels of Nilsson.Furthermore, based on the idea that the barrier of the saddle point of the symmetric fission is higher than that of the asymmetric, we discussed the correlation between the anisotropy of the angular distribution of fission fragments and its mass ratio.</p> <br/>Acta Physica Sinica. 1964 20(10): 1003-1018. Published 1964-05-05 Author(s): ZHU YEI-ZHUNG, LEE TSE-CHING <br/><p>On the basis of the general expression of the scattering matrix between two particles with spin, derived by Jocob and Wick, with certain approximations we have analysed the experimental data of the angular distribution of the fission fragments from Th230,Th232,U234,U236, and U238, bombarded by neutron whose energy is in the region near the fission threshold. The results of this analysis show: (1) The angular distribution of the fission fragments, in the region near the threshold, can be explained by a few rotational bands (every band has a definite parity) above the saddle point. (2) These rotational bands are consistent with the asymptotic energy levels of Nilsson.Furthermore, based on the idea that the barrier of the saddle point of the symmetric fission is higher than that of the asymmetric, we discussed the correlation between the anisotropy of the angular distribution of fission fragments and its mass ratio.</p> <br/>Acta Physica Sinica. 1964 20(10): 1003-1018. Published 1964-05-05 ANGULAR DISTRIBUTION OF THE FISSION FRAGMENTS AND THE STRUCTURE AT THE SADDLE POINT ZHU YEI-ZHUNG, LEE TSE-CHING 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1003-1018. article doi:10.7498/aps.20.1003 10.7498/aps.20.1003 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1003 1003-1018 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1019 Author(s): SEN HSUEH-CHU, CHEN NING-CHIANG <br/><p>Effects of hydrostatic pressure up to 18000 kg/cm2 on the current-voltage characteristics of germanium Esaki diodes are reported. The pressure dependence of the peak currents IP, valley currents IV, peak voltages VP, valley voltages VV, and the exponential excess currents IX have been studied on sixteen germanium Esaki diodes. The results indicate that the semi-logarithmic plot of peak currents IP versus pressure P consists of two straight lines with different negative slopes. The intersecting point occurs in a pressure range from 5000 kg/cm2 to 9000 kg/cm2. The peak voltages VP change only slightly with pressure, while the valley voltages VV are independent of pressure within the limit of experimental errors. For most diodes the pressure dependence of the valley currents is the same as that of peak current. The onsets of the exponential excess currents move toward high voltages with pressure. The pressure dependences of the peak currents and exponential currents have been discussed. It is shown that the presence of two straight lines with different slopes may be related to different tunnelling processes. A pressure coefficiant of the energy gap Eg can be determined at a constant exponential excess current; the result is in good agreement with that given by other authors.</p> <br/>Acta Physica Sinica. 1964 20(10): 1019-1026. Published 1964-05-05 Author(s): SEN HSUEH-CHU, CHEN NING-CHIANG <br/><p>Effects of hydrostatic pressure up to 18000 kg/cm2 on the current-voltage characteristics of germanium Esaki diodes are reported. The pressure dependence of the peak currents IP, valley currents IV, peak voltages VP, valley voltages VV, and the exponential excess currents IX have been studied on sixteen germanium Esaki diodes. The results indicate that the semi-logarithmic plot of peak currents IP versus pressure P consists of two straight lines with different negative slopes. The intersecting point occurs in a pressure range from 5000 kg/cm2 to 9000 kg/cm2. The peak voltages VP change only slightly with pressure, while the valley voltages VV are independent of pressure within the limit of experimental errors. For most diodes the pressure dependence of the valley currents is the same as that of peak current. The onsets of the exponential excess currents move toward high voltages with pressure. The pressure dependences of the peak currents and exponential currents have been discussed. It is shown that the presence of two straight lines with different slopes may be related to different tunnelling processes. A pressure coefficiant of the energy gap Eg can be determined at a constant exponential excess current; the result is in good agreement with that given by other authors.</p> <br/>Acta Physica Sinica. 1964 20(10): 1019-1026. Published 1964-05-05 PRESSURE DEPENDENCE OF THE CURRENT-VOLTAGE CHARACTERISTICS OF GERMANIUM ESAKI DIODES SEN HSUEH-CHU, CHEN NING-CHIANG 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1019-1026. article doi:10.7498/aps.20.1019 10.7498/aps.20.1019 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1019 1019-1026 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1027 Author(s): TSENG HSUN-YI, CHENG CHANG-HWA, FU YAO-SHIEN, WANG SHAO-PO <br/><p>Some investigations on the titanium-containing (～5% Ti) and higher cobolt content (～34% Co) permanent magnet alloy recently developed upon the basis of the composition of Alnico 5 are reported in this paper. It is shown that superior permanent magnetic properties may be obtained by means of isothermal magnetic treatment as compared with those obtained by controlled cooling rate treatment, confirming the experience of Koch et al. It has been found that the coercive force is very sensitive to the temperature of isothermal magnetic treatment. The structural states of isothermally-magnetically treated specimens were investigated by means of electron microscopy and other means. The results indicate that different conditions of prior isothermal magnetic treatment lead to states of different dispersion and morphology of the a′-phase, and hence to different permanent magnetic properties. The experimentally determined C-curve of γ1-phase shows that the precipitation of the γ1-phase is very rapid. Careful metallographic examination has revealed that the so called ar-phase is actually heterogeneous. The experimentally established quantitative relationship between the permanent magnet properties of the alloy and the content of the "ar-phase" clearly demonstrates the detrimental effect of the latter on the former.</p> <br/>Acta Physica Sinica. 1964 20(10): 1027-1036. Published 1964-05-05 Author(s): TSENG HSUN-YI, CHENG CHANG-HWA, FU YAO-SHIEN, WANG SHAO-PO <br/><p>Some investigations on the titanium-containing (～5% Ti) and higher cobolt content (～34% Co) permanent magnet alloy recently developed upon the basis of the composition of Alnico 5 are reported in this paper. It is shown that superior permanent magnetic properties may be obtained by means of isothermal magnetic treatment as compared with those obtained by controlled cooling rate treatment, confirming the experience of Koch et al. It has been found that the coercive force is very sensitive to the temperature of isothermal magnetic treatment. The structural states of isothermally-magnetically treated specimens were investigated by means of electron microscopy and other means. The results indicate that different conditions of prior isothermal magnetic treatment lead to states of different dispersion and morphology of the a′-phase, and hence to different permanent magnetic properties. The experimentally determined C-curve of γ1-phase shows that the precipitation of the γ1-phase is very rapid. Careful metallographic examination has revealed that the so called ar-phase is actually heterogeneous. The experimentally established quantitative relationship between the permanent magnet properties of the alloy and the content of the "ar-phase" clearly demonstrates the detrimental effect of the latter on the former.</p> <br/>Acta Physica Sinica. 1964 20(10): 1027-1036. Published 1964-05-05 SOME INVESTIGATIONS ON TITANIUM-CONTAINING AND HIGHER COBOLT CONTENT ALNICO PERMANENT MAGNET ALLOY TSENG HSUN-YI, CHENG CHANG-HWA, FU YAO-SHIEN, WANG SHAO-PO 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1027-1036. article doi:10.7498/aps.20.1027 10.7498/aps.20.1027 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1027 1027-1036 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1037 Author(s): KUO CHANG-LIN, TAM HAO-YEN <br/><p>By means of the Laue X-ray diffraction method the distribution of polytypes, rule and characteristic features of syntaxic coalescence, and crystal perfection of 400 silicon carbide single crystals, which were taken from graphite furnace and induction furnace of 32 experimental runs and from industrial furnace, have been studied. Numerous observations demonstrate that parallel coalescence in plate silicon carbide single crystal is a very common phenomenon. The crystals with coalescence of more than two polytypes amount to about 2/3 of the crystals studied, whereas crystals of the single type amount to only 1/3. Sometimes coalescence consists of even above 4-5 polytypes.The analysis of polytype distribution in furnace indicates that the polytypes are distributed irregularly, and different polytypes may be found even at the same place of one furnace. The relations among polytype, colour, and etching figure in SiC are analysed. Finally, the different mechanisms of polytype formation in silicon carbide suggested up to date are discussed.</p> <br/>Acta Physica Sinica. 1964 20(10): 1037-1047. Published 1964-05-05 Author(s): KUO CHANG-LIN, TAM HAO-YEN <br/><p>By means of the Laue X-ray diffraction method the distribution of polytypes, rule and characteristic features of syntaxic coalescence, and crystal perfection of 400 silicon carbide single crystals, which were taken from graphite furnace and induction furnace of 32 experimental runs and from industrial furnace, have been studied. Numerous observations demonstrate that parallel coalescence in plate silicon carbide single crystal is a very common phenomenon. The crystals with coalescence of more than two polytypes amount to about 2/3 of the crystals studied, whereas crystals of the single type amount to only 1/3. Sometimes coalescence consists of even above 4-5 polytypes.The analysis of polytype distribution in furnace indicates that the polytypes are distributed irregularly, and different polytypes may be found even at the same place of one furnace. The relations among polytype, colour, and etching figure in SiC are analysed. Finally, the different mechanisms of polytype formation in silicon carbide suggested up to date are discussed.</p> <br/>Acta Physica Sinica. 1964 20(10): 1037-1047. Published 1964-05-05 X-RAY STUDIES ON SYNTAXIC COALESCENCE PHENOMENON OF POLYTYPES IN SiC KUO CHANG-LIN, TAM HAO-YEN 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1037-1047. article doi:10.7498/aps.20.1037 10.7498/aps.20.1037 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1037 1037-1047 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1048 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1048-1052. Published 1964-05-05 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1048-1052. Published 1964-05-05 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1048-1052. article doi:10.7498/aps.20.1048 10.7498/aps.20.1048 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1048 1048-1052 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1053 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1053-1055. Published 1964-05-05 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1053-1055. Published 1964-05-05 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1053-1055. article doi:10.7498/aps.20.1053 10.7498/aps.20.1053 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1053 1053-1055 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1056 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1056-1057. Published 1964-05-05 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1056-1057. Published 1964-05-05 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1056-1057. article doi:10.7498/aps.20.1056 10.7498/aps.20.1056 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1056 1056-1057 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1058 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1058-1060. Published 1964-05-05 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1058-1060. Published 1964-05-05 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1058-1060. article doi:10.7498/aps.20.1058 10.7498/aps.20.1058 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1058 1058-1060 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1061 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1061-1066. Published 1964-05-05 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1964 20(10): 1061-1066. Published 1964-05-05 1964-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1964 20(10): 1061-1066. article doi:10.7498/aps.20.1061 10.7498/aps.20.1061 Acta Physica Sinica 20 10 1964-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.20.1061 1061-1066

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