Henan Normal University

About: Henan Normal University is a education organization based out in Xinxiang, China. It is known for research contribution in the topics: Catalysis & Ionic liquid. The organization has 10863 authors who have published 11077 publications receiving 166773 citations.

Measurement of the proton form factor by studying e(+)e(-) -> p(p)over-tilde

Abstract: Using data samples collected with the BESIII detector at the BEPCII collider, we measure the Born cross section of e(+)e(-) -> p (p) over tilde at 12 center-of-mass energies from 2232.4 to 3671.0 MeV. The corresponding effective electromagnetic form factor of the proton is deduced under the assumption that the electric and magnetic form factors are equal (vertical bar G(E)vertical bar = vertical bar G(M)vertical bar). In addition, the ratio of electric to magnetic form factors, vertical bar G(E)/G(M)vertical bar, and vertical bar G(M)vertical bar are extracted by fitting the polar angle distribution of the proton for the data samples with larger statistics, namely at root s = 2232.4 and 2400.0 MeV and a combined sample at root s = 3050.0, 3060.0 and 3080.0 MeV, respectively. The measured cross sections are in agreement with recent results from BABAR, improving the overall uncertainty by about 30%. The vertical bar G(E)/G(M)vertical bar ratios are close to unity and consistent with BABAR results in the same q(2) region, which indicates the data are consistent with the assumption that vertical bar G(E)vertical bar = vertical bar G(M)vertical bar within uncertainties.

On Vocabulary Acquisition

Abstract: Functional language proficiency requires mastery of a considerably larger number of words. It is therefore necessary to learn a large vocabulary in a short period of time. There is not enough time to copy the natural word acquisition process. There appears to be no alternative to intentional learning of a great many new words in a relatively short period of time. This article sets out to present computer assisted word acquisition which operationalises current theoretical thinking about word acquisition, and result in high efficiency.

Propagating optical-phonon modes and their electron-phonon interactions in wurtzite GaN/Al x Ga 1-x N quantum wells

Abstract: The equation of motion for the $p$-polarization field in an arbitrary wurtzite multilayer heterostructure is solved for the propagating optical-phonon (POP) modes in the framework of the dielectric-continuum model and Loudon's uniaxial crystal model. The polarization eigenvector, the dispersion relation, and the electron-propagating-phonon (EPP) interaction Fr\"ohlich-like Hamiltonian are derived. The analytical formulas can be directly applied to single heterojunctions, single and multiple quantum wells (QW's), and superlattices. The dispersion relations of the POP modes and the EPP coupling functions are investigated for a given $\mathrm{GaN}∕{\mathrm{Al}}_{0.15}{\mathrm{Ga}}_{0.85}\mathrm{N}$ single QW with full account of the strains of QW structures and the anisotropy effects of wurtzite crystals. We find that there are infinite POP branches, which can be denoted by a quantum number $n(n=1,2,\dots{})$, with definite symmetry with respect to the center of symmetry of the QW structure. The dispersion of the POP modes with smaller $n$ is more obvious than for larger $n$. Moreover, the modes with smaller $n$ are much more important for the EPP interactions than the modes with larger $n$. In most cases, it is enough to consider the modes with $n=1,2,\dots{},10$ for the EPP interactions in a single QW. The long-wavelength POP modes are much more important for the EPP interactions. Furthermore, the strain effects of the QW structures have a strong influence on the dispersion of the POP modes. The strength of the EPP interactions is markedly increased due to the strains of the QW structures.