46 research outputs found
Classification of classical and non-local symmetries of fourth-order nonlinear evolution equations
In this paper, we consider group classification of local and quasi-local
symmetries for a general fourth-order evolution equations in one spatial
variable. Following the approach developed by Zhdanov and Lahno, we construct
all inequivalent evolution equations belonging to the class under study which
admit either semi-simple Lie groups or solvable Lie groups. The obtained lists
of invariant equations (up to a local change of variables) contain both the
well-known equations and a variety of new ones possessing rich symmetry. Based
on the results on the group classification for local symmetries, the group
classification for quasi-local symmetries of the equations is also given.Comment: LaTeX, 60 page
ACTIVATION OF DIFFERENT CEREBRAL FUNCTIONAL REGIONS FOLLOWING ACUPUNCTURE AT BOT H TAIXI AND TAICHONG ACUPOINTS AND TAIXI ACUPOINTALONE: AN FMRI STUDY
Background: To explore the brain function regions characteristics of the acupoint combination, this study observed activity changes in the brain
regions of healthy volunteers after acupuncture at both Taixi (KI3) and Taichong (LR3) (KI3 + LR3) and KI3 alone using resting-state functional
magnetic resonance imaging (fMRI).
Methods and Materials: 30 healthy volunteers were randomly allocated into two groups, one group received acupuncture at KI3 and LR3, the
other only acupuncture at KI3, 15 cases in each group. All volunteers underwent resting-state fMRI of the brain 15 minutes before acupuncture,
and which the needle was retained in place for 30 minutes; 15 minutes after withdrawing the needle underwent a further session of resting-state
fMRI. The amplitude of low-frequency fluctuation (ALFF) and regional homogeneity (ReHo) were used to analyze the changes in brain regions.
Results: The KI3+LR3 group compared with the KI3 group, the ALFF analysis indicated that the brain changes relatively concentrated in BA 2,
3, 7, 8, 9, 10, 18, 19, 20, 31, 32, 40, 46 and the cerebellum posterior lobe, the ReHo analysis indicated that the brain changes relatively
concentrated in BA 4, 6, 7, 10, 11, 18, 19, 20, 21, 22, 31, 40 and the cerebellum posterior lobe.
Conclusion: Based on this study, compared with acupuncture at KI3, acupuncture at KI3 + LR3 which could specifically influence BA 7, 10, 18,
19, 20, 31, 40 and cerebellum posterior lobe, which may be related to synergy mechanism of two acupoints combination treatment
Partial Wave Analysis of
BES data on are presented. The
contribution peaks strongly near threshold. It is fitted with a
broad resonance with mass MeV, width MeV. A broad resonance peaking at 2020 MeV is also required
with width MeV. There is further evidence for a component
peaking at 2.55 GeV. The non- contribution is close to phase
space; it peaks at 2.6 GeV and is very different from .Comment: 15 pages, 6 figures, 1 table, Submitted to PL
Energy levels and multipole transition properties of C
Plasma screening effects on the energy structure and radiative transition properties of
helium-like C4+ ions embedded in Debye plasmas are investigated by using the
multi-configuration Dirac-Hartree-Fock method incorporating the Debye-Hückel potential for
both the electron-nucleus and electron-electron interactions. Seventeen fine-structure
energy levels of the low-lying 1s2,
1s2l(l = s,p) and
1s3l′(l′ = s,p,d)
configurations, as well as the electric-dipole (E1), magnetic-dipole
(M1) and magnetic-quadrupole (M2) transition
probabilities and oscillator strengths between these levels have been calculated over a
wide range of screening parameters. It is found that the plasma screening leads to a
decrease of excitation energies and alters the energy levels remarkably. For
Δn ≠ 0 transitions, the spontaneous decay spectra are red-shifted and
their oscillator strengths and transition probabilities decrease with increasing the
interaction screening, while those for the Δn = 0 transitions exhibit
opposite patterns. The influence of electron-nucleus and electron-electron screened
interactions on the changes of energy levels and transition properties are analyzed.
Comparison is made of present results with other data available in the literature for this
ion