Acta Physica Sinica //www.getgobooth.com/ 必威体育下载 daily 15 2024-08-20 10:33:39 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-08-20 10:33:39 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 <![CDATA[THE SYNTHESIS OF CUBIC BORON NITRIDE UNDER HIGH PRESSURES AND TEMPERATURES]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.1 Author(s): SZECHUAN CUBIC BORON NITRIDE CO-OP. GROUP <br/><p>With LiH as additive and Mg/Mg3N2 as catalyst hexagonal boron nitride is transformed into the cubic form, pressure and temperature being maintained at 55-64 Kb and 1700-2100℃ respectively. The structure and related properties of crystals thus obtained are identified and tested. Microseopie examination of impurities, defects, growth centers and steps on crystal surfaces indicates that this cubic BN possesses the common features of crystals grown under ordinary conditions. The results of the synthesis which depends closely upon the P-T condition, catalyst composition and catalyst assembly are analysed and discussed. The remarkable effect of the presence of a small amount of LiH in the catalyst on the grain growth is particularly described. Cubic BN crystals larger than 1mm. have been obtained.</p> <br/>Acta Physica Sinica. 1976 25(1): 1-9. Published 2005-08-03 Author(s): SZECHUAN CUBIC BORON NITRIDE CO-OP. GROUP <br/><p>With LiH as additive and Mg/Mg3N2 as catalyst hexagonal boron nitride is transformed into the cubic form, pressure and temperature being maintained at 55-64 Kb and 1700-2100℃ respectively. The structure and related properties of crystals thus obtained are identified and tested. Microseopie examination of impurities, defects, growth centers and steps on crystal surfaces indicates that this cubic BN possesses the common features of crystals grown under ordinary conditions. The results of the synthesis which depends closely upon the P-T condition, catalyst composition and catalyst assembly are analysed and discussed. The remarkable effect of the presence of a small amount of LiH in the catalyst on the grain growth is particularly described. Cubic BN crystals larger than 1mm. have been obtained.</p> <br/>Acta Physica Sinica. 1976 25(1): 1-9. Published 2005-08-03 THE SYNTHESIS OF CUBIC BORON NITRIDE UNDER HIGH PRESSURES AND TEMPERATURES SZECHUAN CUBIC BORON NITRIDE CO-OP. GROUP 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 1-9. article doi:10.7498/aps.25.1 10.7498/aps.25.1 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.1 1-9 <![CDATA[THE SWITCHING PROCESS OF A TRANSISTOR SCHMITT CIRCUIT]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.10 Author(s): XIN XIAN-JIE <br/><p>The switching process of transistor Schmitt circuit was studied in this paper. Concrete analytical expressions of the switching process have been derived. Using these expressions numerical calculations were carried out for two types of commonly used transistor Schmitt circuit. Experiments were carried out to check the theoretical calculations. Experimental results fit the theoretical calculations quite well. From this study, some rules for selection of the transistors and circuit elements were obtained. The results of calculation in this paper may be used to estimate the switching speed of Schmitt eircuit in the early design stage.</p> <br/>Acta Physica Sinica. 1976 25(1): 10-22. Published 2005-08-03 Author(s): XIN XIAN-JIE <br/><p>The switching process of transistor Schmitt circuit was studied in this paper. Concrete analytical expressions of the switching process have been derived. Using these expressions numerical calculations were carried out for two types of commonly used transistor Schmitt circuit. Experiments were carried out to check the theoretical calculations. Experimental results fit the theoretical calculations quite well. From this study, some rules for selection of the transistors and circuit elements were obtained. The results of calculation in this paper may be used to estimate the switching speed of Schmitt eircuit in the early design stage.</p> <br/>Acta Physica Sinica. 1976 25(1): 10-22. Published 2005-08-03 THE SWITCHING PROCESS OF A TRANSISTOR SCHMITT CIRCUIT XIN XIAN-JIE 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 10-22. article doi:10.7498/aps.25.10 10.7498/aps.25.10 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.10 10-22 <![CDATA[ON THE THEORY OF THERMIONIC EMISSION (Ⅲ)——A MODEL OF DYNAMICAL SURFACE EMISSION CENTERS]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.23 Author(s): ZHANG EN-QIU <br/><p>A dynamical surface emission center model which can explain all observed phenomena in thermionic cathodes is proposed. The emission comes from such an aggregate of atoms that the moving electrons may have momentarily highest energy and/or the attraction from the nuclei to these electrons is momentarily least. Excess barium is the source for supplying high energy electrons, while the oxygen may play a favorable or unfavorable role to emission depending upon its relative quantity and relative position in the aggregate. Although strontium, calcium, aluminate, tungstate, etc. are minor factors to emission, yet they may have some effect on the evaporation, migration, and transition of electrons etc.. The non-uniformity of emission in practical cathodes proves the existence of such centers, while their dynamical character exhibits instability of emission e.g. flicker noise.</p> <br/>Acta Physica Sinica. 1976 25(1): 23-30. Published 2005-08-03 Author(s): ZHANG EN-QIU <br/><p>A dynamical surface emission center model which can explain all observed phenomena in thermionic cathodes is proposed. The emission comes from such an aggregate of atoms that the moving electrons may have momentarily highest energy and/or the attraction from the nuclei to these electrons is momentarily least. Excess barium is the source for supplying high energy electrons, while the oxygen may play a favorable or unfavorable role to emission depending upon its relative quantity and relative position in the aggregate. Although strontium, calcium, aluminate, tungstate, etc. are minor factors to emission, yet they may have some effect on the evaporation, migration, and transition of electrons etc.. The non-uniformity of emission in practical cathodes proves the existence of such centers, while their dynamical character exhibits instability of emission e.g. flicker noise.</p> <br/>Acta Physica Sinica. 1976 25(1): 23-30. Published 2005-08-03 ON THE THEORY OF THERMIONIC EMISSION (Ⅲ)——A MODEL OF DYNAMICAL SURFACE EMISSION CENTERS ZHANG EN-QIU 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 23-30. article doi:10.7498/aps.25.23 10.7498/aps.25.23 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.23 23-30 <![CDATA[UNITARY TRANSFORMATION AND GENERAL LINEAR TRANSFORMATION BY AN OPTICAL METHOD (Ⅱ)——THE ITERATIVE METHOD OF SOLUTION]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.31 Author(s): HUO YU-PING, YANG GUO-ZHEN, GU BEN-YUAN <br/><p>An important problem in applied optics is the design of an optical processing system composed of a series of holographic lenses for the purpose of realizing an arbitrary transformation. In this paper, we give an iterative method of computation to resolve this problem. The convergence of the method and the problem in relation to finite dimension approximation are discussed. Some problems which emerged in the course of numerical calculation are analysed by means of several simple examples.</p> <br/>Acta Physica Sinica. 1976 25(1): 31-46. Published 2005-08-03 Author(s): HUO YU-PING, YANG GUO-ZHEN, GU BEN-YUAN <br/><p>An important problem in applied optics is the design of an optical processing system composed of a series of holographic lenses for the purpose of realizing an arbitrary transformation. In this paper, we give an iterative method of computation to resolve this problem. The convergence of the method and the problem in relation to finite dimension approximation are discussed. Some problems which emerged in the course of numerical calculation are analysed by means of several simple examples.</p> <br/>Acta Physica Sinica. 1976 25(1): 31-46. Published 2005-08-03 UNITARY TRANSFORMATION AND GENERAL LINEAR TRANSFORMATION BY AN OPTICAL METHOD (Ⅱ)——THE ITERATIVE METHOD OF SOLUTION HUO YU-PING, YANG GUO-ZHEN, GU BEN-YUAN 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 31-46. article doi:10.7498/aps.25.31 10.7498/aps.25.31 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.31 31-46 <![CDATA[EFFECTS OF PULSE LENGTH ON THE INTENSITY AND DECAY OF REVERBERATION]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.47 Author(s): QIU XIN-FANG <br/><p>In this paper starting with the general expression of the reverberation intensity for short pulses Ir(t,τ)=Kτt-me-βt, the corresponding exact expressions of the reverberation intensity for longer pulses are derived. The corresponding approximate formulae are also presented under the assumption that the exponential attenuation loss over the pulselength can be neglected. It is shown that, at short ranges, the reverberation intensity tends to saturation and decays inversely with the (m-l)st-power of the time t when the exponential attenuation coefficient β is small enough and the pulselength τ longer than the effective pulselength τm=amt(am decreases as m increases, and m is a real number greater than 2). Experimental results agree well with the theory.</p> <br/>Acta Physica Sinica. 1976 25(1): 47-52. Published 2005-08-03 Author(s): QIU XIN-FANG <br/><p>In this paper starting with the general expression of the reverberation intensity for short pulses Ir(t,τ)=Kτt-me-βt, the corresponding exact expressions of the reverberation intensity for longer pulses are derived. The corresponding approximate formulae are also presented under the assumption that the exponential attenuation loss over the pulselength can be neglected. It is shown that, at short ranges, the reverberation intensity tends to saturation and decays inversely with the (m-l)st-power of the time t when the exponential attenuation coefficient β is small enough and the pulselength τ longer than the effective pulselength τm=amt(am decreases as m increases, and m is a real number greater than 2). Experimental results agree well with the theory.</p> <br/>Acta Physica Sinica. 1976 25(1): 47-52. Published 2005-08-03 EFFECTS OF PULSE LENGTH ON THE INTENSITY AND DECAY OF REVERBERATION QIU XIN-FANG 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 47-52. article doi:10.7498/aps.25.47 10.7498/aps.25.47 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.47 47-52 <![CDATA[PHOTON-PHOTON SCATTERING IN SPONTANEOUSLY BROKEN GAUGE THEORIES]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.53 Author(s): ZHAO BAO-HENG <br/><p>We investigate the contributions of W-meson intermediate states to photon-photon scattering in SU(2)L×U(1) model. Because the spontaneously broken gauge theories are renormalizable and the electromagnetic gauge invariance remains valid under symmetry-breaking, the infinities in the scattering amplitude of one loop approximation must cancel each other. We show the finiteness of the photon-photon scattering amplitude by calculation. We give the effective nonlinear interaction Lagrangian of the electromagnetic field and the scattering cross section at low energies. At low energies the leptonic intermediate states dominate the scattering amplitude, but at high energy limits the contributions of W-meson intermediate states are comparable with the contributions of leptonic intermediate states.</p> <br/>Acta Physica Sinica. 1976 25(1): 53-57. Published 2005-08-03 Author(s): ZHAO BAO-HENG <br/><p>We investigate the contributions of W-meson intermediate states to photon-photon scattering in SU(2)L×U(1) model. Because the spontaneously broken gauge theories are renormalizable and the electromagnetic gauge invariance remains valid under symmetry-breaking, the infinities in the scattering amplitude of one loop approximation must cancel each other. We show the finiteness of the photon-photon scattering amplitude by calculation. We give the effective nonlinear interaction Lagrangian of the electromagnetic field and the scattering cross section at low energies. At low energies the leptonic intermediate states dominate the scattering amplitude, but at high energy limits the contributions of W-meson intermediate states are comparable with the contributions of leptonic intermediate states.</p> <br/>Acta Physica Sinica. 1976 25(1): 53-57. Published 2005-08-03 PHOTON-PHOTON SCATTERING IN SPONTANEOUSLY BROKEN GAUGE THEORIES ZHAO BAO-HENG 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 53-57. article doi:10.7498/aps.25.53 10.7498/aps.25.53 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.53 53-57 <![CDATA[A CALCULATION OF THE EFFECTS OF SINGULAR POINTS IN THE DENSITY OF ELECTRON STATES ON THE T<sub<c</sub< OF In-Cd AND In-Tl ALLOYS]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.58 Author(s): ZHANG LI-YUAN <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 58-64. Published 2005-08-03 Author(s): ZHANG LI-YUAN <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 58-64. Published 2005-08-03 A CALCULATION OF THE EFFECTS OF SINGULAR POINTS IN THE DENSITY OF ELECTRON STATES ON THE T&lt;sub&lt;c&lt;/sub&lt; OF In-Cd AND In-Tl ALLOYS ZHANG LI-YUAN 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 58-64. article doi:10.7498/aps.25.58 10.7498/aps.25.58 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.58 58-64 <![CDATA[THE CLASSIFICATION OF MESONS IN THE STRATON MODEL]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.65 Author(s): HU NING <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 65-68. Published 2005-08-03 Author(s): HU NING <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 65-68. Published 2005-08-03 THE CLASSIFICATION OF MESONS IN THE STRATON MODEL HU NING 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 65-68. article doi:10.7498/aps.25.65 10.7498/aps.25.65 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.65 65-68 <![CDATA[THE U(6) SYMMETRY AND A NEW STRATON SCHEME]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.69 Author(s): LI XIAO-YUAN <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 69-73. Published 2005-08-03 Author(s): LI XIAO-YUAN <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 69-73. Published 2005-08-03 THE U(6) SYMMETRY AND A NEW STRATON SCHEME LI XIAO-YUAN 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 69-73. article doi:10.7498/aps.25.69 10.7498/aps.25.69 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.69 69-73 <![CDATA[TWO PHOTON ANNIHILATION OF NEUTRAL PSEUDOSCALAR MESONS AND THEIR POSSIBLE MIXTURE]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.74 Author(s): ZHANG ZHAO-XI <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 74-77. Published 2005-08-03 Author(s): ZHANG ZHAO-XI <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 74-77. Published 2005-08-03 TWO PHOTON ANNIHILATION OF NEUTRAL PSEUDOSCALAR MESONS AND THEIR POSSIBLE MIXTURE ZHANG ZHAO-XI 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 74-77. article doi:10.7498/aps.25.74 10.7498/aps.25.74 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.74 74-77 <![CDATA[FIELD-CURRENT RELATIONS AND SOME DECAY WIDTHS OF THE NEW PARTICLES]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.78 Author(s): WU DAN-DI, LI TIE-ZHONG, ZHANG ZHAO-XI, HUANG TAO, XIE YI-CHENG <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 78-81. Published 2005-08-03 Author(s): WU DAN-DI, LI TIE-ZHONG, ZHANG ZHAO-XI, HUANG TAO, XIE YI-CHENG <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 78-81. Published 2005-08-03 FIELD-CURRENT RELATIONS AND SOME DECAY WIDTHS OF THE NEW PARTICLES WU DAN-DI, LI TIE-ZHONG, ZHANG ZHAO-XI, HUANG TAO, XIE YI-CHENG 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 78-81. article doi:10.7498/aps.25.78 10.7498/aps.25.78 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.78 78-81 <![CDATA[THE USE OF α-LiIO<sub<3</sub< IN AN ULTRASONIC PROBE]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.82 Author(s): FLAW DETECTION GROUP <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 82-85. Published 2005-08-03 Author(s): FLAW DETECTION GROUP <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 82-85. Published 2005-08-03 THE USE OF α-LiIO&lt;sub&lt;3&lt;/sub&lt; IN AN ULTRASONIC PROBE FLAW DETECTION GROUP 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 82-85. article doi:10.7498/aps.25.82 10.7498/aps.25.82 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.82 82-85 <![CDATA[A BROAD BAND PIEZOELECTRIC SANDWICH TRANSDUCER]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.85 Author(s): ULTRASONIC PROCESSING RESEARCH GROUP <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 85-87. Published 2005-08-03 Author(s): ULTRASONIC PROCESSING RESEARCH GROUP <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 85-87. Published 2005-08-03 A BROAD BAND PIEZOELECTRIC SANDWICH TRANSDUCER ULTRASONIC PROCESSING RESEARCH GROUP 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 85-87. article doi:10.7498/aps.25.85 10.7498/aps.25.85 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.85 85-87 <![CDATA[THE "BUILDING BLOCK" TYPE PATTERN GENERATOR AND ITS PATTERN GENERATION METHOD]]> //www.getgobooth.com/en/article/doi/10.7498/aps.25.88 Author(s): AUTOMATIC MASK MAKING GROUP <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 88-90. Published 2005-08-03 Author(s): AUTOMATIC MASK MAKING GROUP <br/><p></p> <br/>Acta Physica Sinica. 1976 25(1): 88-90. Published 2005-08-03 THE "BUILDING BLOCK" TYPE PATTERN GENERATOR AND ITS PATTERN GENERATION METHOD AUTOMATIC MASK MAKING GROUP 2005-08-03 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1976 25(1): 88-90. article doi:10.7498/aps.25.88 10.7498/aps.25.88 Acta Physica Sinica 25 1 2005-08-03 //www.getgobooth.com/en/article/doi/10.7498/aps.25.88 88-90
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