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Recently, scientists have achieved significant progress in experiments searching for excited Ξb and Λb baryons such as Λb(6072), Λb(6146), Λb(6152), Ξb(6227), Ξb(6100), Ξb(6327), and Ξb(6333). Motivated by these achievements, we systematically analyze the 1D and 2D states of Ξb and Λb baryons using the method of quantum chromodynamics sum rules. By constructing three types of ... 相似文献
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Jiang-Hua Lu 《Communications in Mathematical Physics》2000,212(2):337-370
Let G be a finite dimensional simple complex group equipped with the standard Poisson Lie group structure. We show that all G-homogeneous (holomorphic) Poisson structures on G/H, where H⊂G is a Cartan subgroup, come from solutions to the Classical Dynamical Yang–Baxter equations which are classified by Etingof
and Varchenko. A similar result holds for a maximal compact subgroup K, and we get a family of K-homogeneous Poisson structures on K/T, where T=K∩H is a maximal torus of K. This family exhausts all K-homogeneous Poisson structures on K/T up to isomorphisms. We study some Poisson geometrical properties of members of this family such as their symplectic leaves,
their modular classes, and the moment maps for the T-action.
Received: 4 September 1999 / Accepted: 25 January 2000 相似文献
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A. I. Galyas O. F. Demidenko G. I. Makovetski? K. I. Yanushkevich L. I. Ryabinkina O. B. Romanova 《Physics of the Solid State》2010,52(4):687-690
Regions of the existence of sulfide Gd
x
Mn1 − x
S and selenide Ti
x
Mn1 − x
Se solid solutions have been identified. Their electrical and thermoelectric properties have been studied in the temperature
range 80–900 K. It has been established that the substitution of Gd2+ and Ti2+ ions for Mn2+ cations initiates reversal of the type of charge carrier with respect to the starting compounds MnS and MnSe. The cation
substitution in solid solutions brings about a change from the hole conduction (α > 0) characteristic of the manganese monosulfide
and monoselenide to the electronic conduction (α < 0). 相似文献
5.
Lijuan Zhang Jie Bai Haiou Liang Liping Guo Chunping Li Yarong Huang 《Journal of Macromolecular Science: Physics》2014,53(1):142-148
Polyacrylonitrile (PAN) and PAN/β-cyclodextrin (β-CD) microspheres were prepared via an electrospinning method. The PAN microspheres could be successfully obtained in a suitable range of concentrations of electrospun PAN solutions. When β-CD was added to the PAN solutions, electrospun PAN/β-CD composite spheres were prepared. The morphology of the spheres was characterized by scanning electron microscopy (SEM); it showed that the spheres had uniform diameter and a smooth surface. The composition of the composite microspheres was studied by Fourier transform infrared spectroscopy (FTIR). The results showed that the β-CD was incorporated in the polymer microspheres. 相似文献
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Nonadiabatic coupling matrix elements are computed for six lowest and four lowest 1Πu electronic states of H2 in a wide range of internuclear distances. These matrix elements are used together with the adiabatic potentials to determine the bound ro-vibrational levels of the 10 electronic states for rotational quantum numbers J ? 10. The computed energies agree quite well with existing experimental term values. However, some of the experimental levels should be assigned differently. 相似文献
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Structural Peculiarities and Magnetic Properties of Nanoscale Terbium in Tb/Ti and Tb/Si Multilayers 总被引:1,自引:0,他引:1 下载免费PDF全文
A. V. Svalov V. O. Vas'kovskiy G. V. Kurlyandskaya J. M. Barandiaran I. Orue N. N. Schegoleva A. N. Sorokin 《中国物理快报》2006,23(1):196-199
The structure and the magnetic properties of rf-sputtered nauoscale Tb in [Tb/Ti]n and [Tb/Si] multilayers have been studied experimentally. It is found that the structure of Tb layers changes, transforming from a fine-crystalline state of Tb into an amorphous state as the magnetic layer thickness decreases. The observed displacement of a magnetic ordering temperature to the lower temperature range and the shift of magnetic hysteresis obtained in the ZFC-FC terms may be caused by the size effect and the amorphization. Both the first and the second suppress the exchange interaction and decrease the crystalline magnetic anisotropy. The type of material of nonmagnetic spacers between the Tb layers plays a certain role in these changes. 相似文献
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Monodisperse Au-Fe 3 O 4 heterodimeric nanoparticles (NPs) were prepared by injecting precursors into a hot reaction solution.The size of Au and Fe 3 O 4 particles can be controlled by changing the injection temperature.UV-Vis spectra show that the surface plasma resonance band of Au-Fe 3 O 4 heterodimeric NPs was evidently red-shifted compared with the resonance band of Au NPs of similar size.The as-prepared heterodimeric Au-Fe 3 O 4 NPs exhibited superparamagnetic properties at room temperature.The Ag-Fe 3 O 4 heterodimeric NPs were also prepared by this synthetic method simply using AgNO 3 as precursor instead of HAuCl 4.It is indicated that the reported method can be readily extended to the synthesis of other noble metal conjugated heterodimeric NPs. 相似文献
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Zhaofei Li Jun Tang Masanori Watahiki 《Journal of Physics and Chemistry of Solids》2010,71(4):495-1635
We have successfully synthesized the α-FeSex binary tetragonal superconductors with nominal composition of FeSex (x=0.6-1.0) via conventional solid state reactions between Fe and Se sealed in quartz tubes. Fe and β-FeSe are the most commonly seen impurities in this binary system. A low-temperature annealing at 400 °C is found to be crucial to remove β-FeSe, which is the thermodynamic stable phase with hexagonal symmetry. For all the samples of FeSex, superconductivity is confirmed by magnetic measurements as well as resistivity measurements with their Tc at around 8 K. We noticed that their Tc does not vary with the different nominal Se amount. High-resolution synchrotron X-ray diffraction analysis revealed that the unit cell parameters of all these samples do not change within the error range, and their structure only tolerate the same very small amount of Se deficiency. Based on this study, we concluded that the α-FeSex superconductor only exist in a very narrow deficiency range. 相似文献
10.
B.H. Olaniyi G.A. Beer A. Fry J.A. Macdonald G.R. Mason A. Olin R.M. Pearce P.R. Poffenberger 《Nuclear Physics A》1982,384(3):345-352
We have measured the energies and linewidths of the pionic Kα X-rays for 20Ne and 22Ne using a natural liquid-neon target. The results are
20Ne | 22Ne | |
Neenergy (keV) | 239.12±0.14 | 230.49±0.88 |
width (keV) | 15.43±0.41 | 12.65±3.51 |