//m.getgobooth.com/ 必威体育下载 daily 15 2024-09-05 15:36:23 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-09-05 15:36:23 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.32.1479 Author(s): ZHANG XIU-MU, YANG QI-BING, CHANG XIN, GUO KE-XIN <br/><p>Fringe images of overlapping micro-twin boundaries in a f.c.c. Ni-Cr alloy have been observed by trausmission electron microscopy. It is shown that the average intensity of the fringe images in the overlapping boundary is either much higher or much lower than that of the single boundary depending on the sign and value of the deviation parameters. The contrast of fringes will reverse when one changes the sign of deviation parameters for the matrix and/or the twin. Comparing with the well-known α-fringe and δ-fringe, overlapping twin fringes have special features which may arise from the anomalous absorption-anomalous transmission effects and the dynamic multiple beam interference among the matrix-twin-matrix or twin-matrix-twin. Using Van Dyck's iterative method, simulation images were calculated which are in good agreement with experimental observations.</p> <br/>Acta Physica Sinica. 1983 32(12): 1479-1488. Published 1983-06-05 Author(s): ZHANG XIU-MU, YANG QI-BING, CHANG XIN, GUO KE-XIN <br/><p>Fringe images of overlapping micro-twin boundaries in a f.c.c. Ni-Cr alloy have been observed by trausmission electron microscopy. It is shown that the average intensity of the fringe images in the overlapping boundary is either much higher or much lower than that of the single boundary depending on the sign and value of the deviation parameters. The contrast of fringes will reverse when one changes the sign of deviation parameters for the matrix and/or the twin. Comparing with the well-known α-fringe and δ-fringe, overlapping twin fringes have special features which may arise from the anomalous absorption-anomalous transmission effects and the dynamic multiple beam interference among the matrix-twin-matrix or twin-matrix-twin. Using Van Dyck's iterative method, simulation images were calculated which are in good agreement with experimental observations.</p> <br/>Acta Physica Sinica. 1983 32(12): 1479-1488. Published 1983-06-05 OBSERUATION AND CALCULATION OF FRINGE IMAGES OF OVERLAPPING MICRO-TWIN BOUNDARIES ZHANG XIU-MU, YANG QI-BING, CHANG XIN, GUO KE-XIN 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1479-1488. article doi:10.7498/aps.32.1479 10.7498/aps.32.1479 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1479 1479-1488 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1489 Author(s): XUE ZENG-QUAN, ZHANG CUN-GUI, LIU WEI-MIN, WU QUAN-DE <br/><p>In this work, the structure and chemical composition of thin films of white mica found in Si-Chuan Province are studied by transmission electron microscopy and scanning electron microscopy. The. thickness is in the range of 300-1000?. It is concluded that the sample is nearly perfectly crystalline and contains no detectable impurities, however some defects are discovered in certain regions as shown in the text (Fig. 2-4).Thin mica film can be used as a substrate on which other thin film can deposit or grow into large crystalline grains.</p> <br/>Acta Physica Sinica. 1983 32(12): 1489-1496. Published 1983-06-05 Author(s): XUE ZENG-QUAN, ZHANG CUN-GUI, LIU WEI-MIN, WU QUAN-DE <br/><p>In this work, the structure and chemical composition of thin films of white mica found in Si-Chuan Province are studied by transmission electron microscopy and scanning electron microscopy. The. thickness is in the range of 300-1000?. It is concluded that the sample is nearly perfectly crystalline and contains no detectable impurities, however some defects are discovered in certain regions as shown in the text (Fig. 2-4).Thin mica film can be used as a substrate on which other thin film can deposit or grow into large crystalline grains.</p> <br/>Acta Physica Sinica. 1983 32(12): 1489-1496. Published 1983-06-05 STRUCTURAL CHARACTERISTICS OF THIN FILMS OF WHITE MICA XUE ZENG-QUAN, ZHANG CUN-GUI, LIU WEI-MIN, WU QUAN-DE 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1489-1496. article doi:10.7498/aps.32.1489 10.7498/aps.32.1489 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1489 1489-1496 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1497 Author(s): JIANG SHU-SHENG <br/><p>The fading phenomenon of pendellosung fringes in diamond crystals has been studied by means of X-ray diffraction section topography. The fading periods of dynamical interference frihges have been observed in plate-like crystal and wedge-shaped crystal, as well as in crystal containing a stacking fault. They have been adequately interpreted in terms of dynamical diffraction theory. The quantitative comparison of experiment with theory has been made and the agreement is found to be quite good.</p> <br/>Acta Physica Sinica. 1983 32(12): 1497-1504. Published 1983-06-05 Author(s): JIANG SHU-SHENG <br/><p>The fading phenomenon of pendellosung fringes in diamond crystals has been studied by means of X-ray diffraction section topography. The fading periods of dynamical interference frihges have been observed in plate-like crystal and wedge-shaped crystal, as well as in crystal containing a stacking fault. They have been adequately interpreted in terms of dynamical diffraction theory. The quantitative comparison of experiment with theory has been made and the agreement is found to be quite good.</p> <br/>Acta Physica Sinica. 1983 32(12): 1497-1504. Published 1983-06-05 FADING PHENOMENON OF PENDELLOSUNG FRINGES IN X-RAY SECTION TOPOGRAPHY JIANG SHU-SHENG 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1497-1504. article doi:10.7498/aps.32.1497 10.7498/aps.32.1497 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1497 1497-1504 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1505 Author(s): LU KUN-QUAN, CHANG LONG-CUN, ZHAO YA-QIN <br/><p>The energy aberration of crystal monochromator in the case of continuous X-ray spectrum, for instance EXAFS, has been discussed. Based on the fact that the intensity of continuous X-ray varies slowly with the energy and can be treated as a constant, we propose a method of calculating average resolution for flat crystal and the Johann and Johansson arrangement. We have also pointed out some inappropriate points in analyses on the reflect geometry of Johann arrangement described in previous publications. It is shown that Johann crystal can provide a better resolution than that commonly believed.</p> <br/>Acta Physica Sinica. 1983 32(12): 1505-1514. Published 1983-06-05 Author(s): LU KUN-QUAN, CHANG LONG-CUN, ZHAO YA-QIN <br/><p>The energy aberration of crystal monochromator in the case of continuous X-ray spectrum, for instance EXAFS, has been discussed. Based on the fact that the intensity of continuous X-ray varies slowly with the energy and can be treated as a constant, we propose a method of calculating average resolution for flat crystal and the Johann and Johansson arrangement. We have also pointed out some inappropriate points in analyses on the reflect geometry of Johann arrangement described in previous publications. It is shown that Johann crystal can provide a better resolution than that commonly believed.</p> <br/>Acta Physica Sinica. 1983 32(12): 1505-1514. Published 1983-06-05 THE RESOLUTION OF CRYSTAL MONOCHROMATOR FOR CONTINUOUS X-RAY SPECTRUM LU KUN-QUAN, CHANG LONG-CUN, ZHAO YA-QIN 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1505-1514. article doi:10.7498/aps.32.1505 10.7498/aps.32.1505 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1505 1505-1514 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1515 Author(s): XUE YING-HUA, MIN NAI-BEN, ZHU JIN-SONG, FENG DUAN <br/><p>We studied the second harmonic generation of light in LiNbO3 crystals with periodic laminar ferroelectric domains, in order to make a detailed experimental verification of the theory of quasi-phase-matching proposed by N. Bloembergen et al. First we determined the second harmonic light intensity of single domain LiNbO3 crystals in the regime eω ·eωe→e2ω. Then by using angle-scanning and temperature-scanning, we obtained the maximum second harmonic output from crystals with periodic domains corresponding to quasi-phase-matching. We have verified experimentally the relation that the second harmonic output is proportional to N2(N is the number of domains in the crystal) with N up to 200. We have compared the second harmonic output of crystals with periodic laminar domains in the quasi-phase-matching regime with that of single domain crystals of the same length and optical quality under phase-matched condition oω· oω→e2ω. An order of magnitude enhancement of second harmonic light output has been found. Finally, the structure sensitivity of the second harmonic generation of LiNbO3 crystal with periodic laminar ferroelectric domains has also been studied experimentally.</p> <br/>Acta Physica Sinica. 1983 32(12): 1515-1525. Published 1983-06-05 Author(s): XUE YING-HUA, MIN NAI-BEN, ZHU JIN-SONG, FENG DUAN <br/><p>We studied the second harmonic generation of light in LiNbO3 crystals with periodic laminar ferroelectric domains, in order to make a detailed experimental verification of the theory of quasi-phase-matching proposed by N. Bloembergen et al. First we determined the second harmonic light intensity of single domain LiNbO3 crystals in the regime eω ·eωe→e2ω. Then by using angle-scanning and temperature-scanning, we obtained the maximum second harmonic output from crystals with periodic domains corresponding to quasi-phase-matching. We have verified experimentally the relation that the second harmonic output is proportional to N2(N is the number of domains in the crystal) with N up to 200. We have compared the second harmonic output of crystals with periodic laminar domains in the quasi-phase-matching regime with that of single domain crystals of the same length and optical quality under phase-matched condition oω· oω→e2ω. An order of magnitude enhancement of second harmonic light output has been found. Finally, the structure sensitivity of the second harmonic generation of LiNbO3 crystal with periodic laminar ferroelectric domains has also been studied experimentally.</p> <br/>Acta Physica Sinica. 1983 32(12): 1515-1525. Published 1983-06-05 THE SECOND HARMONIC GENERATION IN LiNbO3 CRYSTALS WITH PERIODIC LAMINAR FERROELECTRIC DOMAINS XUE YING-HUA, MIN NAI-BEN, ZHU JIN-SONG, FENG DUAN 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1515-1525. article doi:10.7498/aps.32.1515 10.7498/aps.32.1515 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1515 1515-1525 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1526 Author(s): WU YUAN-YAN, ZHANG JIN-LIN <br/><p>In this paper, the physical characterestics of the interaction in a gyrotron with a longitudinally varying magnetic field is presented. Equations of motion used in reference are improved by expressing them in normalized form and making them more accurate and more generally applicable. Numerical results are obtained for a pratical case. The physical mechanism of efficiency enhancement with varying magnetic field and its effect on the gyrotron operation are discussed. Phase bunching diagrams demonstrate that the saturation phenomena will be delayed when such varying magnetic field is present.</p> <br/>Acta Physica Sinica. 1983 32(12): 1526-1535. Published 1983-06-05 Author(s): WU YUAN-YAN, ZHANG JIN-LIN <br/><p>In this paper, the physical characterestics of the interaction in a gyrotron with a longitudinally varying magnetic field is presented. Equations of motion used in reference are improved by expressing them in normalized form and making them more accurate and more generally applicable. Numerical results are obtained for a pratical case. The physical mechanism of efficiency enhancement with varying magnetic field and its effect on the gyrotron operation are discussed. Phase bunching diagrams demonstrate that the saturation phenomena will be delayed when such varying magnetic field is present.</p> <br/>Acta Physica Sinica. 1983 32(12): 1526-1535. Published 1983-06-05 NUMERICAL STUDY OF THE PHYSICAL CHARACTERESTICS IN THE GYROTRON WITH A VARYING MAGNETIC FIELD WU YUAN-YAN, ZHANG JIN-LIN 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1526-1535. article doi:10.7498/aps.32.1526 10.7498/aps.32.1526 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1526 1526-1535 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1536 Author(s): XIMEN JI-YE, ZHOU LI-WEI, AI KE-CONG <br/><p>In this paper, the aberration theory for cathode lenses with combined electrostatic and magnetic focusing is discussed in detail. The more general case, when cathode is situated in both magnetic and transversal electric fields, has also been considered. Based on the variational principle, we have derived the general formulae of aberration coefficients of cathode lenses on any image plane, and transformed them into the linear combination of the well-known aberration coefficients given by Glaser. It follows that the aberrations for both the wide electron beam system (cathode lens) and the narrow electron beam system (conventional electron lens) can be treated by the universal variational theory. Hence the relationship between these two systems is also established.The paraxial electron trajectories of cathode lenses are described in the vector form. The aberrations are expressed in the matrix form, and they are suitable for computer calculation.</p> <br/>Acta Physica Sinica. 1983 32(12): 1536-1546. Published 1983-06-05 Author(s): XIMEN JI-YE, ZHOU LI-WEI, AI KE-CONG <br/><p>In this paper, the aberration theory for cathode lenses with combined electrostatic and magnetic focusing is discussed in detail. The more general case, when cathode is situated in both magnetic and transversal electric fields, has also been considered. Based on the variational principle, we have derived the general formulae of aberration coefficients of cathode lenses on any image plane, and transformed them into the linear combination of the well-known aberration coefficients given by Glaser. It follows that the aberrations for both the wide electron beam system (cathode lens) and the narrow electron beam system (conventional electron lens) can be treated by the universal variational theory. Hence the relationship between these two systems is also established.The paraxial electron trajectories of cathode lenses are described in the vector form. The aberrations are expressed in the matrix form, and they are suitable for computer calculation.</p> <br/>Acta Physica Sinica. 1983 32(12): 1536-1546. Published 1983-06-05 VARIATIONAL THEORY OF ABERRATIONS IN CATHODE LENSES XIMEN JI-YE, ZHOU LI-WEI, AI KE-CONG 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1536-1546. article doi:10.7498/aps.32.1536 10.7498/aps.32.1536 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1536 1536-1546 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1547 Author(s): QIAN KUN-MING, LIN ZHAO-HUA, DAI DAO-SHENG <br/><p>In this work, the phenomena of excitation of SWR (Spin Wave Resonance) in magnetic films are investigated. On the basis of Partis' Volume Inhomogeneity (Ⅵ) Model, the Asymmetric Volume Inhomogeneity (AⅥ) Model and the Surface-Volume Inhomogeneity (S-Ⅵ) Model are proposed. In terms of these models, we can explain satifactorily the linear spectra of SWE, in which the odd and even modes are excited simultaneously with their intensities changing in accordance with different envelopes.</p> <br/>Acta Physica Sinica. 1983 32(12): 1547-1556. Published 1983-06-05 Author(s): QIAN KUN-MING, LIN ZHAO-HUA, DAI DAO-SHENG <br/><p>In this work, the phenomena of excitation of SWR (Spin Wave Resonance) in magnetic films are investigated. On the basis of Partis' Volume Inhomogeneity (Ⅵ) Model, the Asymmetric Volume Inhomogeneity (AⅥ) Model and the Surface-Volume Inhomogeneity (S-Ⅵ) Model are proposed. In terms of these models, we can explain satifactorily the linear spectra of SWE, in which the odd and even modes are excited simultaneously with their intensities changing in accordance with different envelopes.</p> <br/>Acta Physica Sinica. 1983 32(12): 1547-1556. Published 1983-06-05 NEW MODELS FOR EXCITATION OF SPIN WAVE RESONANCE QIAN KUN-MING, LIN ZHAO-HUA, DAI DAO-SHENG 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1547-1556. article doi:10.7498/aps.32.1547 10.7498/aps.32.1547 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1547 1547-1556 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1557 Author(s): QIAN KUN-MING, DAI DAO-SHENG, FANG RUI-YI, LIN ZHAO-HUA <br/><p>The linear spin-wave spectra in Fe-Ni polycrystalline films and YIG single crystal films have been observed. It is found that in the spin-wave spectrum of magnetic film the odd and even modes are usually excited simultaneously, and their intensities change in accordance with different envolopes. Further investigations indicate that the positions and relative intensities of the odd and even modes vary with the depositing process and annealing of the film. All these experimental results can be well explained in terms of the Surface-Volume Inhomogeneity (S-VI) Model and the Asymmetric Volume Inhomogeneity (AVI) Model. In this paper the equipment and the relevant methods for measuring the spinwave spectrum are also described briefly.</p> <br/>Acta Physica Sinica. 1983 32(12): 1557-1564. Published 1983-06-05 Author(s): QIAN KUN-MING, DAI DAO-SHENG, FANG RUI-YI, LIN ZHAO-HUA <br/><p>The linear spin-wave spectra in Fe-Ni polycrystalline films and YIG single crystal films have been observed. It is found that in the spin-wave spectrum of magnetic film the odd and even modes are usually excited simultaneously, and their intensities change in accordance with different envolopes. Further investigations indicate that the positions and relative intensities of the odd and even modes vary with the depositing process and annealing of the film. All these experimental results can be well explained in terms of the Surface-Volume Inhomogeneity (S-VI) Model and the Asymmetric Volume Inhomogeneity (AVI) Model. In this paper the equipment and the relevant methods for measuring the spinwave spectrum are also described briefly.</p> <br/>Acta Physica Sinica. 1983 32(12): 1557-1564. Published 1983-06-05 STUDIES OF SPIN-WAVE SPECTRA IN MAGNETIC FILMS QIAN KUN-MING, DAI DAO-SHENG, FANG RUI-YI, LIN ZHAO-HUA 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1557-1564. article doi:10.7498/aps.32.1557 10.7498/aps.32.1557 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1557 1557-1564 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1565 Author(s): WANG XIN-YI, LIN LEI <br/><p>Electrohydrodynamic instabilities of a planar nematic liquid crystal (εαα&lt;0) under an inclined electric field (at an angle θ0 with the normal of the glass plates of the cell) are considered. On the basis of the one-dimensional theory of Dubois-Violette et al, conditions for the onset of instabilities under the excitation of static, sinusoidal and square wave electric Fields, respectively, are obtained. Major results include: (1) Relaxation time of charge increases monotonically with θ0. (2) For MBBA, there exists a critical angle θc(ω)(ω is frequency of external field), when θ0&lt; θc(ω) instability cannot occur. θc(0) =54.2°. (3) For MBBA, threshold voltage is a monotonic increasing function of θ0.</p> <br/>Acta Physica Sinica. 1983 32(12): 1565-1573. Published 1983-06-05 Author(s): WANG XIN-YI, LIN LEI <br/><p>Electrohydrodynamic instabilities of a planar nematic liquid crystal (εαα&lt;0) under an inclined electric field (at an angle θ0 with the normal of the glass plates of the cell) are considered. On the basis of the one-dimensional theory of Dubois-Violette et al, conditions for the onset of instabilities under the excitation of static, sinusoidal and square wave electric Fields, respectively, are obtained. Major results include: (1) Relaxation time of charge increases monotonically with θ0. (2) For MBBA, there exists a critical angle θc(ω)(ω is frequency of external field), when θ0&lt; θc(ω) instability cannot occur. θc(0) =54.2°. (3) For MBBA, threshold voltage is a monotonic increasing function of θ0.</p> <br/>Acta Physica Sinica. 1983 32(12): 1565-1573. Published 1983-06-05 ELECTROHYDRODYNAMIC INSTABILITIES OF NEMATIC LIQUID CRYSTALS——EFFECT OF AN INCLINED ELECTRIC FIELD WANG XIN-YI, LIN LEI 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1565-1573. article doi:10.7498/aps.32.1565 10.7498/aps.32.1565 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1565 1565-1573 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1574 Author(s): ZHANG JI-YUE, GUO ZHI-AN <br/><p>In this paper, spherically symmetric structures of the Brusselator are calculated in detail by using the bifurcation theory. The results show that the solutions have both temporal-spacial dissipative-structures and a high coneentrative range in the centre of the sphere. These results will be greatly helpful in investigation of nuclear-type structures in biological and biochemical phenomena.</p> <br/>Acta Physica Sinica. 1983 32(12): 1574-1585. Published 1983-06-05 Author(s): ZHANG JI-YUE, GUO ZHI-AN <br/><p>In this paper, spherically symmetric structures of the Brusselator are calculated in detail by using the bifurcation theory. The results show that the solutions have both temporal-spacial dissipative-structures and a high coneentrative range in the centre of the sphere. These results will be greatly helpful in investigation of nuclear-type structures in biological and biochemical phenomena.</p> <br/>Acta Physica Sinica. 1983 32(12): 1574-1585. Published 1983-06-05 SPHERICALLY SYMMETRIC STRUCTURES OF THE BRUSSELATOR ZHANG JI-YUE, GUO ZHI-AN 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1574-1585. article doi:10.7498/aps.32.1574 10.7498/aps.32.1574 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1574 1574-1585 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1586 Author(s): YAN YONG-LIAN, QIN RONG-XIAN <br/><p>In this paper, we improve the model of the tuning fork antenna with collective mass, by developing a two-degree of freedom model to a three-degree of freedom one. Finally, the, experimental results of a prototype antenna are given.</p> <br/>Acta Physica Sinica. 1983 32(12): 1586-1588. Published 1983-06-05 Author(s): YAN YONG-LIAN, QIN RONG-XIAN <br/><p>In this paper, we improve the model of the tuning fork antenna with collective mass, by developing a two-degree of freedom model to a three-degree of freedom one. Finally, the, experimental results of a prototype antenna are given.</p> <br/>Acta Physica Sinica. 1983 32(12): 1586-1588. Published 1983-06-05 THE THREE-DEGREE OF FREEDOM MODEL OF THE TUNING FORK ANTENNA WITH COLLECTIVE MASS YAN YONG-LIAN, QIN RONG-XIAN 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1586-1588. article doi:10.7498/aps.32.1586 10.7498/aps.32.1586 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1586 1586-1588 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1589 Author(s): WANG SHI-KUN, GUO HAN-YING, WU KE <br/><p>It is shown that the inverse scattering transform method to solve the Lax pair of given nonlinear evolution equation can be reduced to a kind of Riemann-Hilbert (R-H) problem of meromorphic functions with respect to the complex spectral parameter. The R-H problem is generally regular no matter whether the solitons are involved in it. The linear singular integral equation connected with the R-H problem has been derived, which is essencially equivalent to the Gel'fand-Levitan-Marchenko equation. Furthermore, the regular R-H problem satisfied by the Darboux-B?cklund transformation from a fundamental solution set of the eigenvalue equation of Lax pair to a new set has been given as well. The R-H problem reduced from the inverse scattering transform is in fact a special case of that satisfied by the Darboux-Backlund transformation.</p> <br/>Acta Physica Sinica. 1983 32(12): 1589-1594. Published 1983-06-05 Author(s): WANG SHI-KUN, GUO HAN-YING, WU KE <br/><p>It is shown that the inverse scattering transform method to solve the Lax pair of given nonlinear evolution equation can be reduced to a kind of Riemann-Hilbert (R-H) problem of meromorphic functions with respect to the complex spectral parameter. The R-H problem is generally regular no matter whether the solitons are involved in it. The linear singular integral equation connected with the R-H problem has been derived, which is essencially equivalent to the Gel'fand-Levitan-Marchenko equation. Furthermore, the regular R-H problem satisfied by the Darboux-B?cklund transformation from a fundamental solution set of the eigenvalue equation of Lax pair to a new set has been given as well. The R-H problem reduced from the inverse scattering transform is in fact a special case of that satisfied by the Darboux-Backlund transformation.</p> <br/>Acta Physica Sinica. 1983 32(12): 1589-1594. Published 1983-06-05 INVERSE SCATTERING TRANSFORM AND REGULAR RIEMANN-HILBERT PROBLEM WANG SHI-KUN, GUO HAN-YING, WU KE 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1589-1594. article doi:10.7498/aps.32.1589 10.7498/aps.32.1589 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1589 1589-1594 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1595 Author(s): LIN ZHANG-DA, CHENG YUN-QI, WU SHU-YAO, WU XIAO-LIN, QI SHANG-XUE, XIE KAI <br/><p>We studied the surface of stoichiometric α-Fe2O3 sample bombarded by Ar+ ion beam, the Fe++ ion was identified on it and the surface was found to become FeO-like in property. In addition, the results of UPS and XPS analysis indicated that OH-existed on the FeO-like surface during water adsorption and the Fe++ was the active center of water decomposition. We propose that water molecules adsorpted onto the surface can preliminarily be seperated into OH- and H+ due to the catalysis of 3d electrons of Fe++ ions on the surface. So, in order to raise the efficiency of photo-decomposition of water, it is not only important to modify the band structure, but also to create Fe++ ions on the α-Fe2O3 surface.</p> <br/>Acta Physica Sinica. 1983 32(12): 1595-1601. Published 1983-06-05 Author(s): LIN ZHANG-DA, CHENG YUN-QI, WU SHU-YAO, WU XIAO-LIN, QI SHANG-XUE, XIE KAI <br/><p>We studied the surface of stoichiometric α-Fe2O3 sample bombarded by Ar+ ion beam, the Fe++ ion was identified on it and the surface was found to become FeO-like in property. In addition, the results of UPS and XPS analysis indicated that OH-existed on the FeO-like surface during water adsorption and the Fe++ was the active center of water decomposition. We propose that water molecules adsorpted onto the surface can preliminarily be seperated into OH- and H+ due to the catalysis of 3d electrons of Fe++ ions on the surface. So, in order to raise the efficiency of photo-decomposition of water, it is not only important to modify the band structure, but also to create Fe++ ions on the α-Fe2O3 surface.</p> <br/>Acta Physica Sinica. 1983 32(12): 1595-1601. Published 1983-06-05 SURFACE STUDY ON α-Fe2O3 ELECTRODE FOR PHOTODECOMPOSITION OF WATER LIN ZHANG-DA, CHENG YUN-QI, WU SHU-YAO, WU XIAO-LIN, QI SHANG-XUE, XIE KAI 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1595-1601. article doi:10.7498/aps.32.1595 10.7498/aps.32.1595 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1595 1595-1601 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1602 Author(s): YANG ZONG-QING, ZHONG WEI-ZHUO <br/><p>Based on the experiments about the Brazil twin appearing on -x plane {1120} of synthetic quartz, we have studied the formation mechanism of twinning by means of X-ray topography and electron probe micro-analysis and discussed the disadvantage in Kern's theory of nueleation dynemics of twinning. The new concept of strain barrier in twin boundary (SBTB) is proposed and it is considered that the crystal imperfection raises the energy state of the crystal itself and results in the decrease of height of strain barrier and easy formation of twin. We have also discussed the correlation of twinning with seed orientation, impurities and crystal defects in the light of crystal growth experiments and testing of crystal defects, and emphasized the influence of defects on twinning. Finally, the development of twin has been analysed from the view point of re-entrant corner growth mechanism.</p> <br/>Acta Physica Sinica. 1983 32(12): 1602-1607. Published 1983-06-05 Author(s): YANG ZONG-QING, ZHONG WEI-ZHUO <br/><p>Based on the experiments about the Brazil twin appearing on -x plane {1120} of synthetic quartz, we have studied the formation mechanism of twinning by means of X-ray topography and electron probe micro-analysis and discussed the disadvantage in Kern's theory of nueleation dynemics of twinning. The new concept of strain barrier in twin boundary (SBTB) is proposed and it is considered that the crystal imperfection raises the energy state of the crystal itself and results in the decrease of height of strain barrier and easy formation of twin. We have also discussed the correlation of twinning with seed orientation, impurities and crystal defects in the light of crystal growth experiments and testing of crystal defects, and emphasized the influence of defects on twinning. Finally, the development of twin has been analysed from the view point of re-entrant corner growth mechanism.</p> <br/>Acta Physica Sinica. 1983 32(12): 1602-1607. Published 1983-06-05 THE FORMATION MECHANISM OF THE BRAZIL TWIN ON-x PLANE OF SYNTHETIC QUARTZ YANG ZONG-QING, ZHONG WEI-ZHUO 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1602-1607. article doi:10.7498/aps.32.1602 10.7498/aps.32.1602 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1602 1602-1607 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1608 Author(s): ZENG XIANQ-XIN, ZHU JIA-XUAN, JIN LAN, ZHOU HUI-MING, ZHANG BAI-SHEN, YANG JI-LIAN, YANG YING-CHANG, HE WEN-WANG, LIN CHIN, LUO SHANG, PEI XIE-DI <br/><p>The crystal structure of the ternary compound Y(Mn1-xCox)12 With x = 0.3, 0.5 and 0.6 is body-centered tetragonal of ThMn12 type. The space group is I4/mmm, z= 2. Powder neutron diffraction studies on this system has been performed to determine the possible ordering of the Co and Mn atoms on 3 nonequivalent crystallo-graphic sites 8i, 8j and 8f. The structure analyses at room temperature shows that the Co atoms tend to occupy the 8f sites primarily and then the 8j sites. They avoid the 8i sites when x is lower than 0.67. The experimental result is discussed and an inference is drawn.</p> <br/>Acta Physica Sinica. 1983 32(12): 1608-1612. Published 1983-06-05 Author(s): ZENG XIANQ-XIN, ZHU JIA-XUAN, JIN LAN, ZHOU HUI-MING, ZHANG BAI-SHEN, YANG JI-LIAN, YANG YING-CHANG, HE WEN-WANG, LIN CHIN, LUO SHANG, PEI XIE-DI <br/><p>The crystal structure of the ternary compound Y(Mn1-xCox)12 With x = 0.3, 0.5 and 0.6 is body-centered tetragonal of ThMn12 type. The space group is I4/mmm, z= 2. Powder neutron diffraction studies on this system has been performed to determine the possible ordering of the Co and Mn atoms on 3 nonequivalent crystallo-graphic sites 8i, 8j and 8f. The structure analyses at room temperature shows that the Co atoms tend to occupy the 8f sites primarily and then the 8j sites. They avoid the 8i sites when x is lower than 0.67. The experimental result is discussed and an inference is drawn.</p> <br/>Acta Physica Sinica. 1983 32(12): 1608-1612. Published 1983-06-05 NEUTRON DIFFRACTION STUDIES OF Y(Mn1-xCox)12 ZENG XIANQ-XIN, ZHU JIA-XUAN, JIN LAN, ZHOU HUI-MING, ZHANG BAI-SHEN, YANG JI-LIAN, YANG YING-CHANG, HE WEN-WANG, LIN CHIN, LUO SHANG, PEI XIE-DI 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1608-1612. article doi:10.7498/aps.32.1608 10.7498/aps.32.1608 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1608 1608-1612 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1613 Author(s): LI JI-ZHOU, LI ZHU-QI, YE CHUN-TANG, WU SHAN-LING, HE MIN, XU YUN-HUI, ZHENG ZHI-TAO, ZHOU LI, YIN DAO-LE <br/><p>Inelastic neutron scattering spectra from superconducting material C-15 V2Zr, V2Zr0.95Nb0.05 and V2Hf0.5Zr0.5,V2Hf0.5Zr0.3Nb0.2 were measured by neutron time-of-flight method. It was found that the additional content of Nb influenced the superconducting transition temperature Tc and phonon frequencies of V2Zr1-xNbx in a way different from that of V2Hf0.5Zr0.5-xNbx. The Tc increases and the phonon frequencies "soften" with increasing x for the former, while the Tc slightly decreases and the phonon frequencies "harden" for the latter. The result that the phonon frequencies of V2Zr0.95Nb0.05 are softer than that of V2Zr is somewhat in contradiction with the previous results, which show that the magnetic susceptibilities decrease and the geometric mean phonon frequencies increase. The result that the phonon frequencies of V2Hf0.5Zr0.3Nb0.2 are harder than that of V2Hf0.5Zr0.5 can be considered as the result of hybridization of conduction band, which is studied for close-packed compounds by means of LMTO (linear combination of muffin-tin orbitals) method.</p> <br/>Acta Physica Sinica. 1983 32(12): 1613-1617. Published 1983-06-05 Author(s): LI JI-ZHOU, LI ZHU-QI, YE CHUN-TANG, WU SHAN-LING, HE MIN, XU YUN-HUI, ZHENG ZHI-TAO, ZHOU LI, YIN DAO-LE <br/><p>Inelastic neutron scattering spectra from superconducting material C-15 V2Zr, V2Zr0.95Nb0.05 and V2Hf0.5Zr0.5,V2Hf0.5Zr0.3Nb0.2 were measured by neutron time-of-flight method. It was found that the additional content of Nb influenced the superconducting transition temperature Tc and phonon frequencies of V2Zr1-xNbx in a way different from that of V2Hf0.5Zr0.5-xNbx. The Tc increases and the phonon frequencies "soften" with increasing x for the former, while the Tc slightly decreases and the phonon frequencies "harden" for the latter. The result that the phonon frequencies of V2Zr0.95Nb0.05 are softer than that of V2Zr is somewhat in contradiction with the previous results, which show that the magnetic susceptibilities decrease and the geometric mean phonon frequencies increase. The result that the phonon frequencies of V2Hf0.5Zr0.3Nb0.2 are harder than that of V2Hf0.5Zr0.5 can be considered as the result of hybridization of conduction band, which is studied for close-packed compounds by means of LMTO (linear combination of muffin-tin orbitals) method.</p> <br/>Acta Physica Sinica. 1983 32(12): 1613-1617. Published 1983-06-05 THE EFFECT OF Nb ON PHONONS OF SUPERCONDUCTORS C-15 V2Zr AND V2(HfZr) LI JI-ZHOU, LI ZHU-QI, YE CHUN-TANG, WU SHAN-LING, HE MIN, XU YUN-HUI, ZHENG ZHI-TAO, ZHOU LI, YIN DAO-LE 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1613-1617. article doi:10.7498/aps.32.1613 10.7498/aps.32.1613 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1613 1613-1617 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1618 Author(s): WANG WEN-KUI, HE SHOU-AN, LIU ZHI-YI, XU XIAO-PING, WANG SHOU-ZHENG, HUANG XIN-MING <br/><p>In this puper, we report the synthesis of a new metastable phase La4Au by means of high pressure high temperature treatment of an amorphous alloy. As starting material, the La80Au20 amorphous ribbons were prepared from melt by rapid quenching method. Synthesis conditions were found to be at about 80kbar and 250℃. This new phase has a orthorhombic structure with lattice parameters a = 6.54?, b = 7.71? and c=11.32?, and exhibits superconducting transition at Tc=5.5 K which is higher than that of any known La-Au phases.</p> <br/>Acta Physica Sinica. 1983 32(12): 1618-1622. Published 1983-06-05 Author(s): WANG WEN-KUI, HE SHOU-AN, LIU ZHI-YI, XU XIAO-PING, WANG SHOU-ZHENG, HUANG XIN-MING <br/><p>In this puper, we report the synthesis of a new metastable phase La4Au by means of high pressure high temperature treatment of an amorphous alloy. As starting material, the La80Au20 amorphous ribbons were prepared from melt by rapid quenching method. Synthesis conditions were found to be at about 80kbar and 250℃. This new phase has a orthorhombic structure with lattice parameters a = 6.54?, b = 7.71? and c=11.32?, and exhibits superconducting transition at Tc=5.5 K which is higher than that of any known La-Au phases.</p> <br/>Acta Physica Sinica. 1983 32(12): 1618-1622. Published 1983-06-05 HIGH PRESSURE SYNTHESIS OF La4Au METASTABLE SUPERCONDUCTING PHASE WANG WEN-KUI, HE SHOU-AN, LIU ZHI-YI, XU XIAO-PING, WANG SHOU-ZHENG, HUANG XIN-MING 1983-06-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1983 32(12): 1618-1622. article doi:10.7498/aps.32.1618 10.7498/aps.32.1618 Acta Physica Sinica 32 12 1983-06-05 //m.getgobooth.com/en/article/doi/10.7498/aps.32.1618 1618-1622