//www.getgobooth.com/ 必威体育下载 daily 15 2024-08-20 10:33:38 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-08-20 10:33:38 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.35.141 Author(s): DU DONG-SHENG, YANG XIN-E, LUO MA <br/><p>We propose in this paper a seheme ealled Jet Charge Gross Section Method. In this method, the results of ealculations in pertubative QCD a.re not only less affected by the sea quark and gluon distribution functions in hadrons, just like in the calculations of cross section difference of hadrons: dσ(AB→h+X)-dσ(AB→h-X), but also independent of any fragmentation functions of partons. Furthermore, it is possible to measure the mean electric charges of various quark jets indirectly without distinguishing the quark flavors.</p> <br/>Acta Physica Sinica. 1986 35(2): 141-151. Published 1986-01-05 Author(s): DU DONG-SHENG, YANG XIN-E, LUO MA <br/><p>We propose in this paper a seheme ealled Jet Charge Gross Section Method. In this method, the results of ealculations in pertubative QCD a.re not only less affected by the sea quark and gluon distribution functions in hadrons, just like in the calculations of cross section difference of hadrons: dσ(AB→h+X)-dσ(AB→h-X), but also independent of any fragmentation functions of partons. Furthermore, it is possible to measure the mean electric charges of various quark jets indirectly without distinguishing the quark flavors.</p> <br/>Acta Physica Sinica. 1986 35(2): 141-151. Published 1986-01-05 JET CHARGE CROSS SECTION METHOD DU DONG-SHENG, YANG XIN-E, LUO MA 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 141-151. article doi:10.7498/aps.35.141 10.7498/aps.35.141 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.141 141-151 //www.getgobooth.com/en/article/doi/10.7498/aps.35.152 Author(s): KONG FAN-MEI, LUO MA, HAN TAO, WEN NUAN <br/><p>We analyse the jet-charge-cross section of the following three reactions: p+p→γ+Jet+X, γ+P→2Jets+X, γ+p→h+Jet+X, and present the methods respectively for test-ing gluon distribution function in proton, extracting the information of gluon jets and determining the fragmentation function of gluon.</p> <br/>Acta Physica Sinica. 1986 35(2): 152-160. Published 1986-01-05 Author(s): KONG FAN-MEI, LUO MA, HAN TAO, WEN NUAN <br/><p>We analyse the jet-charge-cross section of the following three reactions: p+p→γ+Jet+X, γ+P→2Jets+X, γ+p→h+Jet+X, and present the methods respectively for test-ing gluon distribution function in proton, extracting the information of gluon jets and determining the fragmentation function of gluon.</p> <br/>Acta Physica Sinica. 1986 35(2): 152-160. Published 1986-01-05 EXPLORING THE GLUON INFORMATION BY THE JET-CHARGE-CROSS SECTION METHOD KONG FAN-MEI, LUO MA, HAN TAO, WEN NUAN 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 152-160. article doi:10.7498/aps.35.152 10.7498/aps.35.152 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.152 152-160 //www.getgobooth.com/en/article/doi/10.7498/aps.35.161 Author(s): LUO MA, CHEN ZHI-JIANG, HAN TAO, YUE GANG <br/><p>Based on the jet-charge-cross section method, a practical scheme is worked out to test the photon structure function directly.</p> <br/>Acta Physica Sinica. 1986 35(2): 161-170. Published 1986-01-05 Author(s): LUO MA, CHEN ZHI-JIANG, HAN TAO, YUE GANG <br/><p>Based on the jet-charge-cross section method, a practical scheme is worked out to test the photon structure function directly.</p> <br/>Acta Physica Sinica. 1986 35(2): 161-170. Published 1986-01-05 DIRECT TEST FOR PHOTON STRUCTURE FUNCTION LUO MA, CHEN ZHI-JIANG, HAN TAO, YUE GANG 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 161-170. article doi:10.7498/aps.35.161 10.7498/aps.35.161 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.161 161-170 //www.getgobooth.com/en/article/doi/10.7498/aps.35.171 Author(s): WEI WEN-DO <br/><p>Information theory provides a constructive criterion for setting up probability distributions on the basis of partial knowledge, and leads to a type of statistical inference which is called the maximumentropy estimate. It is the least biased estimate possible on the given information, i.e., it is maximally noncommittal with regard to missing information.The principle of maximum entropy, which has proven useful in other contexts, is adopted here to design a procedure for obtaining structural information from an incomplete set of diffraction data. A comparison is made between the proposed procedure and the conventional Fourier inversion method used in RDF analysis of non-crystalline materials. The maximum-entropy method is found to have a higher resolution and also the advantage of no adjustable parameters with a high degree of reliability.This method is iterative and uses more computer time than direct techniques; however, a number of comparative examples indicate that a significant improvement on the resultant structure in quality and resolution is possible with only a few iterations.</p> <br/>Acta Physica Sinica. 1986 35(2): 171-176. Published 1986-01-05 Author(s): WEI WEN-DO <br/><p>Information theory provides a constructive criterion for setting up probability distributions on the basis of partial knowledge, and leads to a type of statistical inference which is called the maximumentropy estimate. It is the least biased estimate possible on the given information, i.e., it is maximally noncommittal with regard to missing information.The principle of maximum entropy, which has proven useful in other contexts, is adopted here to design a procedure for obtaining structural information from an incomplete set of diffraction data. A comparison is made between the proposed procedure and the conventional Fourier inversion method used in RDF analysis of non-crystalline materials. The maximum-entropy method is found to have a higher resolution and also the advantage of no adjustable parameters with a high degree of reliability.This method is iterative and uses more computer time than direct techniques; however, a number of comparative examples indicate that a significant improvement on the resultant structure in quality and resolution is possible with only a few iterations.</p> <br/>Acta Physica Sinica. 1986 35(2): 171-176. Published 1986-01-05 MAXIMUM ENTROPY METHOD IN STRUCTURAL ANALYSIS WEI WEN-DO 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 171-176. article doi:10.7498/aps.35.171 10.7498/aps.35.171 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.171 171-176 //www.getgobooth.com/en/article/doi/10.7498/aps.35.177 Author(s): JIANG QI-DU, LIU FU-SUI <br/><p>This report discussed the dependence of the electrical resistance and magnetoresis-tance on temperature and magnetic field, which are resulted from the scattering of conducting electrons with coupled pairs in magnetic field for magnetic alloy with slightly high concentration of impurity. Rohrer's empirical formula of magnetoresistance variation with concentration for AuFe alloy is obtained here theoretically.</p> <br/>Acta Physica Sinica. 1986 35(2): 177-187. Published 1986-01-05 Author(s): JIANG QI-DU, LIU FU-SUI <br/><p>This report discussed the dependence of the electrical resistance and magnetoresis-tance on temperature and magnetic field, which are resulted from the scattering of conducting electrons with coupled pairs in magnetic field for magnetic alloy with slightly high concentration of impurity. Rohrer's empirical formula of magnetoresistance variation with concentration for AuFe alloy is obtained here theoretically.</p> <br/>Acta Physica Sinica. 1986 35(2): 177-187. Published 1986-01-05 COUPLING PAIR MODEL FOR NEGATIVE MAGNETORESISTANCE OF MAGNETIC ALLOY WITH SLIGHTLY HIGH CONCENTRATION OF IMPURITY JIANG QI-DU, LIU FU-SUI 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 177-187. article doi:10.7498/aps.35.177 10.7498/aps.35.177 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.177 177-187 //www.getgobooth.com/en/article/doi/10.7498/aps.35.188 Author(s): GE CHCAN-ZHEN, LING LI, WANG MU, NIU ZHOUNG-MIN, MING NAI-BEN, FENG DUAN <br/><p>Birefringence images of screw dislocations in Gadolinium Gallium Garnet (GGG) and Yttrium Aluminum Garnet YAG) crystals are studied in detail. Birefringence images of screw dislocations viewed end-on were observed for the first tiane. The one-to-one correspondence between birefringence images of screw dislocations viewed end-on and that viewed from the side was demonstrated. The contour of equal intensity of birefringence image of screw dislocation viewed end-on in GGG and YAG crystals was derived by considering the photo-elastieal anisotropy of garnet, and the result yields good agreement Avith experimental observations.</p> <br/>Acta Physica Sinica. 1986 35(2): 188-195. Published 1986-01-05 Author(s): GE CHCAN-ZHEN, LING LI, WANG MU, NIU ZHOUNG-MIN, MING NAI-BEN, FENG DUAN <br/><p>Birefringence images of screw dislocations in Gadolinium Gallium Garnet (GGG) and Yttrium Aluminum Garnet YAG) crystals are studied in detail. Birefringence images of screw dislocations viewed end-on were observed for the first tiane. The one-to-one correspondence between birefringence images of screw dislocations viewed end-on and that viewed from the side was demonstrated. The contour of equal intensity of birefringence image of screw dislocation viewed end-on in GGG and YAG crystals was derived by considering the photo-elastieal anisotropy of garnet, and the result yields good agreement Avith experimental observations.</p> <br/>Acta Physica Sinica. 1986 35(2): 188-195. Published 1986-01-05 BIREFRINGENCE IMAGES OF SCREW DISLOCATIONS VIEWED END-ON IN GGG AND YAG CRYSTALS GE CHCAN-ZHEN, LING LI, WANG MU, NIU ZHOUNG-MIN, MING NAI-BEN, FENG DUAN 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 188-195. article doi:10.7498/aps.35.188 10.7498/aps.35.188 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.188 188-195 //www.getgobooth.com/en/article/doi/10.7498/aps.35.196 Author(s): TAO FANG, ZHANG TAI-YONG, NIU SHI-WEN, GOU CHENG, SHI ZHONG-JIAN, LIN QUAN <br/><p>Acoustical activity of isomorphous crystals Bi12GeO20 and Bi12SiO20 has been studied by measuring the splitting of degeneracy of transverse acoustical waves propagating along high symmetric direction with inelastic neutron scattering. One of the interesting results is that the left and right circularly polarized modes of acoustical phonons propagating along direction are subjected to different attenuation. This conclusion is verified by both kinds of crystals. The experimental result is observed for the first time in the study of acoustical activity. The life-time of the phonon with larger attenuation is found to be about 2×10-11 s. experimentally.</p> <br/>Acta Physica Sinica. 1986 35(2): 196-202. Published 1986-01-05 Author(s): TAO FANG, ZHANG TAI-YONG, NIU SHI-WEN, GOU CHENG, SHI ZHONG-JIAN, LIN QUAN <br/><p>Acoustical activity of isomorphous crystals Bi12GeO20 and Bi12SiO20 has been studied by measuring the splitting of degeneracy of transverse acoustical waves propagating along high symmetric direction with inelastic neutron scattering. One of the interesting results is that the left and right circularly polarized modes of acoustical phonons propagating along direction are subjected to different attenuation. This conclusion is verified by both kinds of crystals. The experimental result is observed for the first time in the study of acoustical activity. The life-time of the phonon with larger attenuation is found to be about 2×10-11 s. experimentally.</p> <br/>Acta Physica Sinica. 1986 35(2): 196-202. Published 1986-01-05 INELASTIC NEUTRON SCATTERING STUDY ON ACOUSTICAL ACTIVITY OF Bi12GeO20 AND Bi12SiO20 TAO FANG, ZHANG TAI-YONG, NIU SHI-WEN, GOU CHENG, SHI ZHONG-JIAN, LIN QUAN 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 196-202. article doi:10.7498/aps.35.196 10.7498/aps.35.196 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.196 196-202 //www.getgobooth.com/en/article/doi/10.7498/aps.35.203 Author(s): TIAN BO-GANG, LI JIA-MING <br/><p>Based on two properties of the generalized oscillator strength densities: (1) continuity in an excitation channel and (2) quasiscaling relation along an isoelectronic sequence, the corresponding parameters in the Bethe's formula (namely the Bethe's physical parameter set) have similar behaviors. According to the Bethe's formula, excitation cross sections for spin allowed processes can be easily calculated in terms of the Bethe 's physical parameter set which characterizes the excitations of target atoms. In the present article, we introduce corrected functions defined as the ratios between the exact cross sections and the Bethe's cross sections. The corrected functions reveal a nice universal scaling feature within 50%. Thus, various cross sections as well as rates, which correspond to electron impact excitations from an initial state to infinite final states-forming a so called "excitation channel", can be obtained conveniently.</p> <br/>Acta Physica Sinica. 1986 35(2): 203-212. Published 1986-01-05 Author(s): TIAN BO-GANG, LI JIA-MING <br/><p>Based on two properties of the generalized oscillator strength densities: (1) continuity in an excitation channel and (2) quasiscaling relation along an isoelectronic sequence, the corresponding parameters in the Bethe's formula (namely the Bethe's physical parameter set) have similar behaviors. According to the Bethe's formula, excitation cross sections for spin allowed processes can be easily calculated in terms of the Bethe 's physical parameter set which characterizes the excitations of target atoms. In the present article, we introduce corrected functions defined as the ratios between the exact cross sections and the Bethe's cross sections. The corrected functions reveal a nice universal scaling feature within 50%. Thus, various cross sections as well as rates, which correspond to electron impact excitations from an initial state to infinite final states-forming a so called "excitation channel", can be obtained conveniently.</p> <br/>Acta Physica Sinica. 1986 35(2): 203-212. Published 1986-01-05 ELECTRONIC IMPACT EXCITATION CROSS SECTIONS AND RATES (I)——SPIN ALLOWED EXCITATION PROCESSES TIAN BO-GANG, LI JIA-MING 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 203-212. article doi:10.7498/aps.35.203 10.7498/aps.35.203 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.203 203-212 //www.getgobooth.com/en/article/doi/10.7498/aps.35.213 Author(s): XU YI-SUN, MA DONG-PIN, SONG ZENG-FU, LI DA-FEN, GU YING-JUN <br/><p>Thermal shifts of sub-levels R1 and R2 in YA1O3:Nd3+ has been measured. The behavious of the principal value of the integral in the single-phonon term have been investigated and the contribution of optical frequency branch to thermal shifts of sub-levels has been considered.By using the formulas involving Raman term, single-phonon term and term of optical frequency branch, thermal shifts of sub-levels R1 and R2 are calculated. Satisfactory agreement between the results of the theory and experimental values is obtained.</p> <br/>Acta Physica Sinica. 1986 35(2): 213-219. Published 1986-01-05 Author(s): XU YI-SUN, MA DONG-PIN, SONG ZENG-FU, LI DA-FEN, GU YING-JUN <br/><p>Thermal shifts of sub-levels R1 and R2 in YA1O3:Nd3+ has been measured. The behavious of the principal value of the integral in the single-phonon term have been investigated and the contribution of optical frequency branch to thermal shifts of sub-levels has been considered.By using the formulas involving Raman term, single-phonon term and term of optical frequency branch, thermal shifts of sub-levels R1 and R2 are calculated. Satisfactory agreement between the results of the theory and experimental values is obtained.</p> <br/>Acta Physica Sinica. 1986 35(2): 213-219. Published 1986-01-05 THERMAL SHIFTS OF SUB-LEVELS R1 AND R2 IN YAlO3:Nd3+ XU YI-SUN, MA DONG-PIN, SONG ZENG-FU, LI DA-FEN, GU YING-JUN 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 213-219. article doi:10.7498/aps.35.213 10.7498/aps.35.213 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.213 213-219 //www.getgobooth.com/en/article/doi/10.7498/aps.35.220 Author(s): C. S. IH, WANG YONG-ZHAO, WU JI-ZONG, XIANG LIAN-QIN <br/><p>Computer-generated hologram for elliptical gaussian beam correction lias been investigated, detail mathematical equations of calculating hologram phase difference arc derived. The holograms which are drawn by a computer-driven plotter are given. The holographic optical elements are obtained from CGH. The experiment result to demonstrate the correct calculation is also shown in this paper.</p> <br/>Acta Physica Sinica. 1986 35(2): 220-227. Published 1986-01-05 Author(s): C. S. IH, WANG YONG-ZHAO, WU JI-ZONG, XIANG LIAN-QIN <br/><p>Computer-generated hologram for elliptical gaussian beam correction lias been investigated, detail mathematical equations of calculating hologram phase difference arc derived. The holograms which are drawn by a computer-driven plotter are given. The holographic optical elements are obtained from CGH. The experiment result to demonstrate the correct calculation is also shown in this paper.</p> <br/>Acta Physica Sinica. 1986 35(2): 220-227. Published 1986-01-05 COMPUTER-GENERATED HOLOGRAM FOR ELLIPTICAL GAUSSIAN WAVEFRONT CORRECTION C. S. IH, WANG YONG-ZHAO, WU JI-ZONG, XIANG LIAN-QIN 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 220-227. article doi:10.7498/aps.35.220 10.7498/aps.35.220 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.220 220-227 //www.getgobooth.com/en/article/doi/10.7498/aps.35.228 Author(s): GU ZHI-YU, WANG SHAO-YING, LEI JIE, CAI XIAO-HONG, WANG YONG, YUAN DA-CHANG <br/><p>The formation and quenching kinetics of ArF* and Ar2F* have been studied by ive-stigating their timeresolved spectra. Analysis shows that the decay process of ArF* depands on the time evolution of it's main precursor Ar*, but that of Ar2F* is determined by its own effective lifetime. Thereby the two-body quenching rate constant of Ar* by F2, three-body quenching rate constant of Ar* by Ar, as well as two-body quenching rate constant of Ar2F* by He, Ar and F2, and the radiative lifetime of Ar2F* are determined.</p> <br/>Acta Physica Sinica. 1986 35(2): 228-234. Published 1986-01-05 Author(s): GU ZHI-YU, WANG SHAO-YING, LEI JIE, CAI XIAO-HONG, WANG YONG, YUAN DA-CHANG <br/><p>The formation and quenching kinetics of ArF* and Ar2F* have been studied by ive-stigating their timeresolved spectra. Analysis shows that the decay process of ArF* depands on the time evolution of it's main precursor Ar*, but that of Ar2F* is determined by its own effective lifetime. Thereby the two-body quenching rate constant of Ar* by F2, three-body quenching rate constant of Ar* by Ar, as well as two-body quenching rate constant of Ar2F* by He, Ar and F2, and the radiative lifetime of Ar2F* are determined.</p> <br/>Acta Physica Sinica. 1986 35(2): 228-234. Published 1986-01-05 TIME-RESOLVED SPECTRA STUDIES OF ArF* AND Ar2F* EXCIMERS UNDER FAST-DISCHARGE EXCITATION GU ZHI-YU, WANG SHAO-YING, LEI JIE, CAI XIAO-HONG, WANG YONG, YUAN DA-CHANG 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 228-234. article doi:10.7498/aps.35.228 10.7498/aps.35.228 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.228 228-234 //www.getgobooth.com/en/article/doi/10.7498/aps.35.235 Author(s): DONG BI-ZHEN, GU BEN-YUAN <br/><p>For "the general eases (paraxial approximation and non-paraxial ease), the ways of effective design of optical system to be composed of a single mask for the purpose of realizing any given linear transform are presented. Tinder various manners of choice of parameters, the solutions of equations to determine the amplitude-phase distribution of mask are investigated, and the stability of solution is also discussed. Under non-paraxial case, the solutions available in real situation are also found. Applying 4- and 8-dimen-sion Walsh transforms in the three different orders as examples, we investigate the effects of various parameters, such as the spacings between input plane, mask and output plane, and the number of sampling points in mask, on ‘approach distance', which describes the degree of approach of the transform to be performed by the system to any given linear transform. It would provide a realizable way to choose the relevant parameters and an usuful enlightment in the real design of an optical system for realizing a given linear transform.</p> <br/>Acta Physica Sinica. 1986 35(2): 235-242. Published 1986-01-05 Author(s): DONG BI-ZHEN, GU BEN-YUAN <br/><p>For "the general eases (paraxial approximation and non-paraxial ease), the ways of effective design of optical system to be composed of a single mask for the purpose of realizing any given linear transform are presented. Tinder various manners of choice of parameters, the solutions of equations to determine the amplitude-phase distribution of mask are investigated, and the stability of solution is also discussed. Under non-paraxial case, the solutions available in real situation are also found. Applying 4- and 8-dimen-sion Walsh transforms in the three different orders as examples, we investigate the effects of various parameters, such as the spacings between input plane, mask and output plane, and the number of sampling points in mask, on ‘approach distance', which describes the degree of approach of the transform to be performed by the system to any given linear transform. It would provide a realizable way to choose the relevant parameters and an usuful enlightment in the real design of an optical system for realizing a given linear transform.</p> <br/>Acta Physica Sinica. 1986 35(2): 235-242. Published 1986-01-05 THE EFFECTIVE DESIGN OF A SINGLE HOLOGRAPHIC LENS FOR REALIZING OPTICAL TRANSFORM DONG BI-ZHEN, GU BEN-YUAN 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 235-242. article doi:10.7498/aps.35.235 10.7498/aps.35.235 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.235 235-242 //www.getgobooth.com/en/article/doi/10.7498/aps.35.243 Author(s): LIU RONG-CHUAN, XIA YUAN-FU, WANG SHU-XIN, LI YU-KUI, YAN QI-JIE, CHEN YI, LIU HAI-YANG <br/><p>M?ssbauer spectroseopy has been used to study the dispersity of Eu2O3 on the surface of different supports. Changes in M?ssbauer parameters as a function of the europium content reveal the difference of the interaction between Bu2O3 and the support. On the surface of γ-Al2O3, the M?ssbauer isome shift progressively increases toward to that of bulk Eu2O3 with increasing metal loading, suggesting that the crystal phase of Eu2O3 forms gradually. In contrast, on the surfaces of two types of SiO2 the isomer shifts do not change with changing the metal loading in the range of our study. This suggests that Eus03 tends to spread out on the surface as a second layer over monola-yer dispersion. The conclusion obtained by M?ssbauer spectroseopy is in agreement with that obtained by X-ray diffraction</p> <br/>Acta Physica Sinica. 1986 35(2): 243-246. Published 1986-01-05 Author(s): LIU RONG-CHUAN, XIA YUAN-FU, WANG SHU-XIN, LI YU-KUI, YAN QI-JIE, CHEN YI, LIU HAI-YANG <br/><p>M?ssbauer spectroseopy has been used to study the dispersity of Eu2O3 on the surface of different supports. Changes in M?ssbauer parameters as a function of the europium content reveal the difference of the interaction between Bu2O3 and the support. On the surface of γ-Al2O3, the M?ssbauer isome shift progressively increases toward to that of bulk Eu2O3 with increasing metal loading, suggesting that the crystal phase of Eu2O3 forms gradually. In contrast, on the surfaces of two types of SiO2 the isomer shifts do not change with changing the metal loading in the range of our study. This suggests that Eus03 tends to spread out on the surface as a second layer over monola-yer dispersion. The conclusion obtained by M?ssbauer spectroseopy is in agreement with that obtained by X-ray diffraction</p> <br/>Acta Physica Sinica. 1986 35(2): 243-246. Published 1986-01-05 A MOSSBAUER STUDY FOR THE Eu2O3 DISPERSITY ON THE SUPPORT SURFACE LIU RONG-CHUAN, XIA YUAN-FU, WANG SHU-XIN, LI YU-KUI, YAN QI-JIE, CHEN YI, LIU HAI-YANG 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 243-246. article doi:10.7498/aps.35.243 10.7498/aps.35.243 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.243 243-246 //www.getgobooth.com/en/article/doi/10.7498/aps.35.247 Author(s): ZHENG WEI-MOU <br/><p>By means of the Darboux transformation and an integral transformation, two classes of solvable double-well potential models are obtained for the Fokker-Planck equation. The exact results are compared with Kramers' approximation.</p> <br/>Acta Physica Sinica. 1986 35(2): 247-253. Published 1986-01-05 Author(s): ZHENG WEI-MOU <br/><p>By means of the Darboux transformation and an integral transformation, two classes of solvable double-well potential models are obtained for the Fokker-Planck equation. The exact results are compared with Kramers' approximation.</p> <br/>Acta Physica Sinica. 1986 35(2): 247-253. Published 1986-01-05 EXACTLY SOLVABLE MODELS FOR THE FOKKER-PLANCK EQUATION ZHENG WEI-MOU 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 247-253. article doi:10.7498/aps.35.247 10.7498/aps.35.247 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.247 247-253 //www.getgobooth.com/en/article/doi/10.7498/aps.35.254 Author(s): YANG RUI-QING, XIONG SHI-JIE, CAI JIAN-HUA <br/><p>The electronic transport processes in metallic superlattices are studied by solving Boltzmann's equation with inclusion of a temperature gradient as well as an external magnetic field and by adopting the treatment of interface scattering processes in our revious interpretation of electric conduction characteristics. Variations with modulation wavelength of the thermoelectric power, the electronic thermal conductivity, the Thomson and Hall coefficients are derived for Nb/Ti superlattices. Further experimental investigations on the transport properties of metallic superlattices are expected to help the understanding of the electronic processes in such artificial materials.</p> <br/>Acta Physica Sinica. 1986 35(2): 254-260. Published 1986-01-05 Author(s): YANG RUI-QING, XIONG SHI-JIE, CAI JIAN-HUA <br/><p>The electronic transport processes in metallic superlattices are studied by solving Boltzmann's equation with inclusion of a temperature gradient as well as an external magnetic field and by adopting the treatment of interface scattering processes in our revious interpretation of electric conduction characteristics. Variations with modulation wavelength of the thermoelectric power, the electronic thermal conductivity, the Thomson and Hall coefficients are derived for Nb/Ti superlattices. Further experimental investigations on the transport properties of metallic superlattices are expected to help the understanding of the electronic processes in such artificial materials.</p> <br/>Acta Physica Sinica. 1986 35(2): 254-260. Published 1986-01-05 ON ELECTRONIC TRANSPORT PROCESSES IN METALLIC SUPERLATTICES YANG RUI-QING, XIONG SHI-JIE, CAI JIAN-HUA 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 254-260. article doi:10.7498/aps.35.254 10.7498/aps.35.254 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.254 254-260 //www.getgobooth.com/en/article/doi/10.7498/aps.35.261 Author(s): FAN DE-PEI, HAN FU-SEN <br/><p>The difficulty in indexing back-reflection Kossel diffraction patterns, especially for non-cubic systems arises from the fact that the diffraction cones do not have common vertex.Two methods which can be used for indexing diffraction patterns, both in cubic and non-cubic systems, are presented in this paper. By means of the stereographic pro-jction or computer programm described here, one can easily determine the diffraction indices of back-reflection Kossel lines.The advantage of the frst method is simple and direct. For the second method, the degree of automatization is higher, and measured data with some errors can be employed.</p> <br/>Acta Physica Sinica. 1986 35(2): 261-265. Published 1986-01-05 Author(s): FAN DE-PEI, HAN FU-SEN <br/><p>The difficulty in indexing back-reflection Kossel diffraction patterns, especially for non-cubic systems arises from the fact that the diffraction cones do not have common vertex.Two methods which can be used for indexing diffraction patterns, both in cubic and non-cubic systems, are presented in this paper. By means of the stereographic pro-jction or computer programm described here, one can easily determine the diffraction indices of back-reflection Kossel lines.The advantage of the frst method is simple and direct. For the second method, the degree of automatization is higher, and measured data with some errors can be employed.</p> <br/>Acta Physica Sinica. 1986 35(2): 261-265. Published 1986-01-05 THE INDEXING OF BACK-REFLECTION KOSSEL DIFFRACTION PATTERNS FAN DE-PEI, HAN FU-SEN 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 261-265. article doi:10.7498/aps.35.261 10.7498/aps.35.261 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.261 261-265 //www.getgobooth.com/en/article/doi/10.7498/aps.35.266 Author(s): LI HONG-CHENG, WANG RUI-LAN, WANG PING-SHU, GUAN WEI-YEN <br/><p>A new method for determining the energy gap of a superconductor using the maximum in the differential conductance curve of electron tunneling spectrum is given in this paper. The Vmax/kT versus △/kT curve was caculated from tunneling theory, Vmax, the voltage of the conductance maximum, can be measured from electron tunneling spectrum.△/kT can be found from this curve, then the energy gap △ can be caeulated. This method is simple, fast and accurate. The accuracy almost approaches that of the curve fitting method.</p> <br/>Acta Physica Sinica. 1986 35(2): 266-268. Published 1986-01-05 Author(s): LI HONG-CHENG, WANG RUI-LAN, WANG PING-SHU, GUAN WEI-YEN <br/><p>A new method for determining the energy gap of a superconductor using the maximum in the differential conductance curve of electron tunneling spectrum is given in this paper. The Vmax/kT versus △/kT curve was caculated from tunneling theory, Vmax, the voltage of the conductance maximum, can be measured from electron tunneling spectrum.△/kT can be found from this curve, then the energy gap △ can be caeulated. This method is simple, fast and accurate. The accuracy almost approaches that of the curve fitting method.</p> <br/>Acta Physica Sinica. 1986 35(2): 266-268. Published 1986-01-05 A NEW METHOD FOR DETERMINING THE ENERGY GAP OF A SUPERCONDUCTOR USING THE MAXIMUM IN DIFFERENTIAL CONDUCTANCE OF ELECTRON TUNNELING SPECTRUM LI HONG-CHENG, WANG RUI-LAN, WANG PING-SHU, GUAN WEI-YEN 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 266-268. article doi:10.7498/aps.35.266 10.7498/aps.35.266 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.266 266-268 //www.getgobooth.com/en/article/doi/10.7498/aps.35.269 Author(s): ZHOU JUN-MING, HUANG YI, MENG QING-HUI, CHENG WEN-QIN, WU YONG-SHENG, LI YONG-KANG, YANG ZHONG-XING <br/><p>The high quality modulation doped GaAs/N-AlGaAs heterostructures have been grown by a vertical molecular beam epitaxy system (MBE). Electron mobility of two dimentional electron gas (2DBG) at 4.2 K has reached as high as 4.26×105cm2/V·s (in the dark) and 5.9×105cm2/V·s (under light illumination). The polaron mass of 2DEG was determined by analysis of oscillatory resistance change of magnetophonon resonance in pulsed magnetic field. The mobility enhancement of 2DEG in low field and quantum Hall effect in high field at 4.2 K were also studied.</p> <br/>Acta Physica Sinica. 1986 35(2): 269-273. Published 1986-01-05 Author(s): ZHOU JUN-MING, HUANG YI, MENG QING-HUI, CHENG WEN-QIN, WU YONG-SHENG, LI YONG-KANG, YANG ZHONG-XING <br/><p>The high quality modulation doped GaAs/N-AlGaAs heterostructures have been grown by a vertical molecular beam epitaxy system (MBE). Electron mobility of two dimentional electron gas (2DBG) at 4.2 K has reached as high as 4.26×105cm2/V·s (in the dark) and 5.9×105cm2/V·s (under light illumination). The polaron mass of 2DEG was determined by analysis of oscillatory resistance change of magnetophonon resonance in pulsed magnetic field. The mobility enhancement of 2DEG in low field and quantum Hall effect in high field at 4.2 K were also studied.</p> <br/>Acta Physica Sinica. 1986 35(2): 269-273. Published 1986-01-05 GROWTH AND TRANSPORT PROPERTIER OF MODULATION DOPED GaAs/AlGaAs HETEROSTRUCTURES ZHOU JUN-MING, HUANG YI, MENG QING-HUI, CHENG WEN-QIN, WU YONG-SHENG, LI YONG-KANG, YANG ZHONG-XING 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 269-273. article doi:10.7498/aps.35.269 10.7498/aps.35.269 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.269 269-273 //www.getgobooth.com/en/article/doi/10.7498/aps.35.274 Author(s): FENG GUO-GUANG <br/><p>Convergent-beam electron diffraction zone-axis patterns have been obtained from transverse basal stacking faults in graphite and molybdenite. These patterns show a reduced symmetry and split reflections. The splitting and unsplitting of the reflections correspond to the visibility and invisibility of the stacking faults in the theory of diffraction contrast of imperfect crystals. This analysis can be extended to zone-axis patterns obtained from other crystal defects.</p> <br/>Acta Physica Sinica. 1986 35(2): 274-278. Published 1986-01-05 Author(s): FENG GUO-GUANG <br/><p>Convergent-beam electron diffraction zone-axis patterns have been obtained from transverse basal stacking faults in graphite and molybdenite. These patterns show a reduced symmetry and split reflections. The splitting and unsplitting of the reflections correspond to the visibility and invisibility of the stacking faults in the theory of diffraction contrast of imperfect crystals. This analysis can be extended to zone-axis patterns obtained from other crystal defects.</p> <br/>Acta Physica Sinica. 1986 35(2): 274-278. Published 1986-01-05 CONVERGENT-BEAM ELECTRON DIFFRACTION STUDY OF TRANSVERSE BASAL STACKING FAULTS IN LAYER STRUCTURES FENG GUO-GUANG 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 274-278. article doi:10.7498/aps.35.274 10.7498/aps.35.274 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.274 274-278 //www.getgobooth.com/en/article/doi/10.7498/aps.35.279 Author(s): FENG GUO-GUANG <br/><p>Convergent-beam electron diffraction near a dislocation in silicon shows that some of the higher-order Laue zone lines and Kikuchi lines are split. The splitting of crystal-lographically equivalent reflections is different. These can be explained in terms of the theory of diffraction contrast of imperfect crystals. The splitting and unsplitting of the reflections correspond to the visibility and in visibility of the dislocation. Convergent-beam electron diffraction provides a powerful means for the study of crystal defects with high spatial resolution.</p> <br/>Acta Physica Sinica. 1986 35(2): 279-282. Published 1986-01-05 Author(s): FENG GUO-GUANG <br/><p>Convergent-beam electron diffraction near a dislocation in silicon shows that some of the higher-order Laue zone lines and Kikuchi lines are split. The splitting of crystal-lographically equivalent reflections is different. These can be explained in terms of the theory of diffraction contrast of imperfect crystals. The splitting and unsplitting of the reflections correspond to the visibility and in visibility of the dislocation. Convergent-beam electron diffraction provides a powerful means for the study of crystal defects with high spatial resolution.</p> <br/>Acta Physica Sinica. 1986 35(2): 279-282. Published 1986-01-05 CONVERGENT-BEAM ELECTRON DIFFRACTION STUDY OF DISLOCATIONS FENG GUO-GUANG 1986-01-05 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1986 35(2): 279-282. article doi:10.7498/aps.35.279 10.7498/aps.35.279 Acta Physica Sinica 35 2 1986-01-05 //www.getgobooth.com/en/article/doi/10.7498/aps.35.279 279-282

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