Bragg's law with refractive correction of low-angle X-ray diffraction for periodic multilayers is deduced according to the optical refractive law and interference rules.Variant forms of this law,which accorded wit...Bragg's law with refractive correction of low-angle X-ray diffraction for periodic multilayers is deduced according to the optical refractive law and interference rules.Variant forms of this law,which accorded with experiments quite well,are given.展开更多
Both the similarities existing between diffusion-limited aggregation(DLA)cluster border and Brownian motion and the perimeter-area relation have revealed that the fractal dimension of DLA cluster border is about 2.0.
A quantitative criterion is proposed for testing the rationality of an effective QCD baryon theory.The higher order corrections of the standard SU(3)Skyrme model to the Gell-Mann-Okubo relations for baryons are studie...A quantitative criterion is proposed for testing the rationality of an effective QCD baryon theory.The higher order corrections of the standard SU(3)Skyrme model to the Gell-Mann-Okubo relations for baryons are studied according to the criterion,and some interesting results are presented.A possible prescription is recommended.展开更多
The agglomeration in ion-implanted a-Ge/Ag bilayer films has been investigated by use of transmission electron microscopy(TEM).There are two kinds of fractal structures,one of which is soot-like with fractal dimension...The agglomeration in ion-implanted a-Ge/Ag bilayer films has been investigated by use of transmission electron microscopy(TEM).There are two kinds of fractal structures,one of which is soot-like with fractal dimension(FD)of 1.515,the other is snow-flake-like with FD of 1.797.The result is compared with that of the unimplanted film,and the mechanism of the occurrence of fractal regions is also discussed.展开更多
Variation of the correlation length of icosahedral phase with the annealing temperature is got according to the broadening of the X-ray diffraction peak.The fact that the correlation length does not change during the ...Variation of the correlation length of icosahedral phase with the annealing temperature is got according to the broadening of the X-ray diffraction peak.The fact that the correlation length does not change during the crystallization process means that the grains of icosahedral phase are transformed wholly and perfectly to crystalline Al_(6)Mn.展开更多
Taking into consideration of the main results observed in Al-Mn quasicrystal,we suggest a structure model with m35 symmetry.The grain of quasicrystal can grow up with definite Al and Mn sites and Al:Mn ratio.All atoms...Taking into consideration of the main results observed in Al-Mn quasicrystal,we suggest a structure model with m35 symmetry.The grain of quasicrystal can grow up with definite Al and Mn sites and Al:Mn ratio.All atoms in this model have 12 coordinates and all neighboring distances are suitable.Especially,the density deduced from it is in good agreement with experiment.展开更多
In this paper,the formula for calculating elemental relative sensitivity factor(S factor)has been deduced using the revised“full diffusion”model of electron scattering1.The calculated curves of S factors lie between...In this paper,the formula for calculating elemental relative sensitivity factor(S factor)has been deduced using the revised“full diffusion”model of electron scattering1.The calculated curves of S factors lie between the experimental curves obtained from the differential spectra2 and the integral spectra3.展开更多
The broadening of X-ray diffraction peaks has been used successfully to measure the grain sizes of WSi_(2) in cosputtered W-Si films after annealing.The grain size of WSi_(2) increases with annealing temperature and r...The broadening of X-ray diffraction peaks has been used successfully to measure the grain sizes of WSi_(2) in cosputtered W-Si films after annealing.The grain size of WSi_(2) increases with annealing temperature and reaches 115nm after annealing at 1000°C.The grain sizes are quite similar to that obtained by transmission electron microscope in electron beam coevaporated film and low pressure chemical vapor deposited film.展开更多
The a-Ge/p-Au bilayer thin films with different Au grain sizes were prepared.After annealing,different patterns of Ge appeared in the film morphology.It is found that the fractal dimensions of the patterns are highly ...The a-Ge/p-Au bilayer thin films with different Au grain sizes were prepared.After annealing,different patterns of Ge appeared in the film morphology.It is found that the fractal dimensions of the patterns are highly dependent on the grain size of Au,and the experimental results indicate that the fractal formation in such system is truly dominated by the local latent temperature field.展开更多
The intensity ratios I(L)/I(K)from Ge to Sn have been measured in a Transmission electron microscope(TEM)using X-ray energy dispersive spectroscopy(EDS)at 40,80,100,120,160,200kV.The large discrepancy between experime...The intensity ratios I(L)/I(K)from Ge to Sn have been measured in a Transmission electron microscope(TEM)using X-ray energy dispersive spectroscopy(EDS)at 40,80,100,120,160,200kV.The large discrepancy between experimental and calculated values indicates that the formula of ionization cross-section should be revised.展开更多
Using the flavor-singlet axial current of 0(1) in the large Nc expansion and the Skyrme model with BuBu term (6-derivative term),we calculate the quark spin contents of proton and various static observables of the bar...Using the flavor-singlet axial current of 0(1) in the large Nc expansion and the Skyrme model with BuBu term (6-derivative term),we calculate the quark spin contents of proton and various static observables of the baryons.It is found that the problem of the crossing between the mass spectra of the octet and decuplet in SU(3) can be solved naturally.The numerical results are compatible with experimental data.展开更多
Under the scaling limit, i.e. T→T_c+, H→O, R→∞, where h=const. H|T-T_c|^(-15/8) is fixed and small, while r=R|T-T_c|is fixed and large, we investigate the energy-spin correlation function <σ_(M1), _(N1)σ_(M2)...Under the scaling limit, i.e. T→T_c+, H→O, R→∞, where h=const. H|T-T_c|^(-15/8) is fixed and small, while r=R|T-T_c|is fixed and large, we investigate the energy-spin correlation function <σ_(M1), _(N1)σ_(M2), _(N2)ε_(N3), N3> of Ising model with small external magnetic field. By cluster expansion we obtain its leading and next leading terms related to K_0(nr) and K_1(nr) up to order h^2.展开更多
We develop in this paper the theory of multiphonon radiative transition so that someimportant physical quantities that describe effect s of lattice relaxation in electron transitions,for example, Huang--Rhys parameter...We develop in this paper the theory of multiphonon radiative transition so that someimportant physical quantities that describe effect s of lattice relaxation in electron transitions,for example, Huang--Rhys parameters, lattice relaxation energies and Stokes shifts, becomecomputable directly. The calculated results of the se physical quantities for alexandrite agreewith experimental data very well. Besides, we deduce expressions of intensity distributionand integrated intensity of a multiphonon sideband in non--Condon approximation. The cal-culated values of integrated intensities are obviously better than the intensity fitting resultsof previous work. From these calculated values we can also acquire a quantitative under-standing of the errors of Condon approximation.展开更多
基金Supported by the National Natural Science Foundation of China.
文摘Bragg's law with refractive correction of low-angle X-ray diffraction for periodic multilayers is deduced according to the optical refractive law and interference rules.Variant forms of this law,which accorded with experiments quite well,are given.
文摘Both the similarities existing between diffusion-limited aggregation(DLA)cluster border and Brownian motion and the perimeter-area relation have revealed that the fractal dimension of DLA cluster border is about 2.0.
基金Supported by the National Natural Science Foundation of China through C.N.Yanghe Science Fund of the Chinese Academy of Sciences.
文摘A quantitative criterion is proposed for testing the rationality of an effective QCD baryon theory.The higher order corrections of the standard SU(3)Skyrme model to the Gell-Mann-Okubo relations for baryons are studied according to the criterion,and some interesting results are presented.A possible prescription is recommended.
文摘The agglomeration in ion-implanted a-Ge/Ag bilayer films has been investigated by use of transmission electron microscopy(TEM).There are two kinds of fractal structures,one of which is soot-like with fractal dimension(FD)of 1.515,the other is snow-flake-like with FD of 1.797.The result is compared with that of the unimplanted film,and the mechanism of the occurrence of fractal regions is also discussed.
基金supported in part by the Structure Research Lab.Univ.of Sci.and technol.of China.
文摘Variation of the correlation length of icosahedral phase with the annealing temperature is got according to the broadening of the X-ray diffraction peak.The fact that the correlation length does not change during the crystallization process means that the grains of icosahedral phase are transformed wholly and perfectly to crystalline Al_(6)Mn.
文摘Taking into consideration of the main results observed in Al-Mn quasicrystal,we suggest a structure model with m35 symmetry.The grain of quasicrystal can grow up with definite Al and Mn sites and Al:Mn ratio.All atoms in this model have 12 coordinates and all neighboring distances are suitable.Especially,the density deduced from it is in good agreement with experiment.
文摘In this paper,the formula for calculating elemental relative sensitivity factor(S factor)has been deduced using the revised“full diffusion”model of electron scattering1.The calculated curves of S factors lie between the experimental curves obtained from the differential spectra2 and the integral spectra3.
文摘The broadening of X-ray diffraction peaks has been used successfully to measure the grain sizes of WSi_(2) in cosputtered W-Si films after annealing.The grain size of WSi_(2) increases with annealing temperature and reaches 115nm after annealing at 1000°C.The grain sizes are quite similar to that obtained by transmission electron microscope in electron beam coevaporated film and low pressure chemical vapor deposited film.
文摘The a-Ge/p-Au bilayer thin films with different Au grain sizes were prepared.After annealing,different patterns of Ge appeared in the film morphology.It is found that the fractal dimensions of the patterns are highly dependent on the grain size of Au,and the experimental results indicate that the fractal formation in such system is truly dominated by the local latent temperature field.
文摘The intensity ratios I(L)/I(K)from Ge to Sn have been measured in a Transmission electron microscope(TEM)using X-ray energy dispersive spectroscopy(EDS)at 40,80,100,120,160,200kV.The large discrepancy between experimental and calculated values indicates that the formula of ionization cross-section should be revised.
基金vip professor in Institute of Theoretical PhysicsAcademia Sinica
文摘Using the flavor-singlet axial current of 0(1) in the large Nc expansion and the Skyrme model with BuBu term (6-derivative term),we calculate the quark spin contents of proton and various static observables of the baryons.It is found that the problem of the crossing between the mass spectra of the octet and decuplet in SU(3) can be solved naturally.The numerical results are compatible with experimental data.
基金Project supported in part by the National Natural Science Foundation of China.
文摘Under the scaling limit, i.e. T→T_c+, H→O, R→∞, where h=const. H|T-T_c|^(-15/8) is fixed and small, while r=R|T-T_c|is fixed and large, we investigate the energy-spin correlation function <σ_(M1), _(N1)σ_(M2), _(N2)ε_(N3), N3> of Ising model with small external magnetic field. By cluster expansion we obtain its leading and next leading terms related to K_0(nr) and K_1(nr) up to order h^2.
文摘We develop in this paper the theory of multiphonon radiative transition so that someimportant physical quantities that describe effect s of lattice relaxation in electron transitions,for example, Huang--Rhys parameters, lattice relaxation energies and Stokes shifts, becomecomputable directly. The calculated results of the se physical quantities for alexandrite agreewith experimental data very well. Besides, we deduce expressions of intensity distributionand integrated intensity of a multiphonon sideband in non--Condon approximation. The cal-culated values of integrated intensities are obviously better than the intensity fitting resultsof previous work. From these calculated values we can also acquire a quantitative under-standing of the errors of Condon approximation.
