//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.18.491 Author(s): CHEN SHIH-KANG, CHANG YI-SHANG, LIOU DE-SEN <br/><p>The energy bands of the zinc blende structure are treated by the simplified LCAO method of Slater and Koster. A model of the chemical bond is proposed for the purpose that the matrix elements involved may be expressed in terms of certain parameters of the chemical bonds. The energy levels of a number of points in the Brillouin zone are investigated. With this approach, we discuss the variation of the band gap as well as the position shift of the conduction band edge with the change of chemical compositions.</p> <br/>Acta Physica Sinica. 1962 18(10): 491-500. Published 1962-05-05 Author(s): CHEN SHIH-KANG, CHANG YI-SHANG, LIOU DE-SEN <br/><p>The energy bands of the zinc blende structure are treated by the simplified LCAO method of Slater and Koster. A model of the chemical bond is proposed for the purpose that the matrix elements involved may be expressed in terms of certain parameters of the chemical bonds. The energy levels of a number of points in the Brillouin zone are investigated. With this approach, we discuss the variation of the band gap as well as the position shift of the conduction band edge with the change of chemical compositions.</p> <br/>Acta Physica Sinica. 1962 18(10): 491-500. Published 1962-05-05 INFLUENCE OF THE CHEMICAL BOND ON THE ENERGY BANDS OF THE ZINC BLENDE STRUCTURE CHEN SHIH-KANG, CHANG YI-SHANG, LIOU DE-SEN 1962-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1962 18(10): 491-500. article doi:10.7498/aps.18.491 10.7498/aps.18.491 Acta Physica Sinica 18 10 1962-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.18.491 491-500 //www.getgobooth.com/en/article/doi/10.7498/aps.18.501 Author(s): CHIEN TSU-WEN <br/><p>The assumption of the relaxation of the reaction MgSO4←→Mg+++SO4-- to be the basis of sound absorption in water has not sufficient ground. In this paper, the author derives a formula for relaxation absorption based on the chemical thermodynamics, and the supposition from which the phenomenological theory started is also explained. With the consideration of Debye-Hückel ionic atmosphere theory, the formula obtained is applied to the water solution of MgSO4. A critical discussion is given to the existing theories.</p> <br/>Acta Physica Sinica. 1962 18(10): 501-508. Published 1962-05-05 Author(s): CHIEN TSU-WEN <br/><p>The assumption of the relaxation of the reaction MgSO4←→Mg+++SO4-- to be the basis of sound absorption in water has not sufficient ground. In this paper, the author derives a formula for relaxation absorption based on the chemical thermodynamics, and the supposition from which the phenomenological theory started is also explained. With the consideration of Debye-Hückel ionic atmosphere theory, the formula obtained is applied to the water solution of MgSO4. A critical discussion is given to the existing theories.</p> <br/>Acta Physica Sinica. 1962 18(10): 501-508. Published 1962-05-05 THEORY OF SOUND ABSORPTION AND THE RELAXATION MECHANISM OF MgSO&lt;sub&lt;4&lt;/sub&lt; IN WATER SOLUTION CHIEN TSU-WEN 1962-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1962 18(10): 501-508. article doi:10.7498/aps.18.501 10.7498/aps.18.501 Acta Physica Sinica 18 10 1962-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.18.501 501-508 //www.getgobooth.com/en/article/doi/10.7498/aps.18.509 Author(s): HU NING <br/><p>The Green's function of a single π-meson is obtained by the method of dispersion telation utilizing the analytic and unitary properties of the nucleon-antinucleon scattering amplitude. No renormalization procedure is needed.</p> <br/>Acta Physica Sinica. 1962 18(10): 509-513. Published 1962-05-05 Author(s): HU NING <br/><p>The Green's function of a single π-meson is obtained by the method of dispersion telation utilizing the analytic and unitary properties of the nucleon-antinucleon scattering amplitude. No renormalization procedure is needed.</p> <br/>Acta Physica Sinica. 1962 18(10): 509-513. Published 1962-05-05 THE DERIVATION OF ONE-PARTICAL GREEN'S FUNCTION BY THE METHOD OF DISPERSION RELATION HU NING 1962-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1962 18(10): 509-513. article doi:10.7498/aps.18.509 10.7498/aps.18.509 Acta Physica Sinica 18 10 1962-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.18.509 509-513 //www.getgobooth.com/en/article/doi/10.7498/aps.18.514 Author(s): CHEN CHIEN-POU <br/><p>A periodic field formed with three or five lens elements can be used as an image-forming lens in ion-optics. Generally, it possesses much stronger focusing ability than a single lens element under the same voltage ratio. Periodic field lenses have been used as initial focusing systems of ion sources in some electrostatic accelerators, yet its image-forming characteristics have not been fully studied.This paper proposes a method to investigate the image-forming characteristics of periodic field lenses. Treating periodic field lens as a lens-element-combination, the expressions of its cardinal points can be obtained by using Ferrarias characteristic determinant. For a general case, with immersion lens as lens element, the expressions of cardinal points of periodic field lenses of three and five lens elements have been given. In these expressions only cardinal parameters of lens element and geometrical parameters of electrode system are involved. These derived expressions are quite simple in form, easy for calculation with sufficient accuracy. Thus there is no difficulty in studying the general characteristics of these lenses.Using these expressions, the image-forming characteristics of some periodic field lenses with symmetrical two-tube lens of small gap-spacing as lens element have been calculated and analysed.</p> <br/>Acta Physica Sinica. 1962 18(10): 514-526. Published 1962-05-05 Author(s): CHEN CHIEN-POU <br/><p>A periodic field formed with three or five lens elements can be used as an image-forming lens in ion-optics. Generally, it possesses much stronger focusing ability than a single lens element under the same voltage ratio. Periodic field lenses have been used as initial focusing systems of ion sources in some electrostatic accelerators, yet its image-forming characteristics have not been fully studied.This paper proposes a method to investigate the image-forming characteristics of periodic field lenses. Treating periodic field lens as a lens-element-combination, the expressions of its cardinal points can be obtained by using Ferrarias characteristic determinant. For a general case, with immersion lens as lens element, the expressions of cardinal points of periodic field lenses of three and five lens elements have been given. In these expressions only cardinal parameters of lens element and geometrical parameters of electrode system are involved. These derived expressions are quite simple in form, easy for calculation with sufficient accuracy. Thus there is no difficulty in studying the general characteristics of these lenses.Using these expressions, the image-forming characteristics of some periodic field lenses with symmetrical two-tube lens of small gap-spacing as lens element have been calculated and analysed.</p> <br/>Acta Physica Sinica. 1962 18(10): 514-526. Published 1962-05-05 THE IMAGE-FORMING CHARACTERISTICS OF PERIODIC FIELD LENSES CHEN CHIEN-POU 1962-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1962 18(10): 514-526. article doi:10.7498/aps.18.514 10.7498/aps.18.514 Acta Physica Sinica 18 10 1962-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.18.514 514-526 //www.getgobooth.com/en/article/doi/10.7498/aps.18.527 Author(s): HU REN YU <br/><p>In this paper the characteristics of cavity chambers of different wall material (graphite, bakelite, Al) and different volume are studied. Using this method, the dose rate of γ-rays of Ra is obtained. The experimental result is (corrected for density effect of wall material) 8.74±0.27 γ/mg/hr, at 1 cm off the source (without Pt packing). Using the correction factor of the different thicknesses of Pt packing of Laurence, this value becomes 8.15±0.27 γ/mg/hr (Source in 0.5 mm Pt).This result is in good agreement with previous works within the experimental errors.</p> <br/>Acta Physica Sinica. 1962 18(10): 527-539. Published 1962-05-05 Author(s): HU REN YU <br/><p>In this paper the characteristics of cavity chambers of different wall material (graphite, bakelite, Al) and different volume are studied. Using this method, the dose rate of γ-rays of Ra is obtained. The experimental result is (corrected for density effect of wall material) 8.74±0.27 γ/mg/hr, at 1 cm off the source (without Pt packing). Using the correction factor of the different thicknesses of Pt packing of Laurence, this value becomes 8.15±0.27 γ/mg/hr (Source in 0.5 mm Pt).This result is in good agreement with previous works within the experimental errors.</p> <br/>Acta Physica Sinica. 1962 18(10): 527-539. Published 1962-05-05 THE CAVITY CHAMBER MEASUREMENT OF DOSE RATE OF RADIUM γ-RAYS HU REN YU 1962-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1962 18(10): 527-539. article doi:10.7498/aps.18.527 10.7498/aps.18.527 Acta Physica Sinica 18 10 1962-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.18.527 527-539 //www.getgobooth.com/en/article/doi/10.7498/aps.18.540 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1962 18(10): 540-544. Published 1962-05-05 Author(s): <br/><p></p> <br/>Acta Physica Sinica. 1962 18(10): 540-544. Published 1962-05-05 1962-05-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1962 18(10): 540-544. article doi:10.7498/aps.18.540 10.7498/aps.18.540 Acta Physica Sinica 18 10 1962-05-05 //www.getgobooth.com/en/article/doi/10.7498/aps.18.540 540-544

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