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Search Results: 1 - 10 of 89899 matches for " YU Fu-sheng "
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Preparation of Al72Ni8Ti8Zr6Nb3Y3 amorphous powders and bulk materials
Yu Wu,Xin-fu Wang,Fu-sheng Han
- , 2016, DOI: https://doi.org/10.1007/s12613-016-1338-5
Abstract: Amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were successfully fabricated by mechanical alloying. The microstructure, glass-forming ability, and crystallization behavior of amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). The isothermal crystallization kinetics was analyzed by the Johnson–Mehl–Avrami equation. In the results, the supercooled liquid region of the amorphous alloy is as high as 81 K, as determined by non-isothermal DSC curves. The activation energy for crystallization is as high as 312.6 kJ·mol?1 obtained by Kissinger and Ozawa analyses. The values of Avrami exponent (n) imply that the crystallization is dominated by interface-controlled three-dimensional growth in the early stage and the end stage and by diffusion-controlled two- or three-dimensional growth in the middle stage. In addition, the amorphous Al72Ni8Ti8Zr6Nb3Y3 powders were sintered under 2 GPa at temperatures of 673 K and 723 K. The results show that the Vickers hardness of the compacted powders is as high as Hv 1215.
Effect of regular screening and health education on the incidence of diabetes
Fu-sheng FANG,Hui TIAN,Ying YU,Qin MA
Medical Journal of Chinese People's Liberation Army , 2011,
Abstract: Objective To investigate the incidence of diabetes after regular diabetes screening and health education in one community in Beijing.Methods The subjects investigated and undergone oral glucose tolerance test(OGTT)(75g) for evaluating glucose metabolic level in 2006 were followed up to survey the incidence of diabetes in 2008.The health education was hereafter carried out once a year,and healthy lifestyle instruction was carried out for individuals with pre-diabetes,and those individuals were followed up again to observe the change in diabetes incidence in 2010.Results The incidence of diabetes in 2008~2010 was 7.2‰ per year,which was much lower than that in 2006~2008(13.5‰,P < 0.05).Among subjects of pre-diabetes assumed in 2006,14.9% of them converted from pre-diabetes to diabetes in 2008;however,only 5.1% subjects of pre-diabetes detected in 2008 converted to diabetes in 2010.Logistic regression analysis showed that increased age(OR=1.58,95%CI 1.019~2.439,P < 0.05) and hypertension(OR=9.60,95%CI 1.070~86.141,P < 0.05) were the independent risk factors for the incidence of diabetes;health education was conducive to a decrease in the incidence of diabetes(OR=0.51,95%CI 0.297~0.889,P < 0.05).Conclusion Regular diabetes screening and health education are conducive to lowering of the incidence of diabetes,while increasing age,impaired glucose regulation and hypertension may contribute to the increase in diabetes incidence.
Photon Polarization in the b->s gamma processes in the Left-Right Symmetric Model
Fu-Sheng Yu,Emi Kou,Cai-Dian Lü
Physics , 2013, DOI: 10.1007/JHEP12(2013)102
Abstract: The circular-polarization of the photon in the radiative B decays is dominantly left-handed in the Standard Model (SM), but the right-handed polarization may be enhanced in some new physics models with right-handed currents, such as the Left-Right Symmetric Model (LRSM). In this article, we investigate how large this wrong polarization could be within the allowed parameter space of the LRSM. We show that in LRSM, the right-handed polarization of the photon in the $b\to s\gamma$ processes could be largely enhanced by the $W_L-W_R$ mixing contributions because of the helicity flip on the internal top quark line of the penguin diagrams and the enhancement by the CKM factor $V_{ts}^R/V_{ts}^L$. We discuss the sensitivity of the proposed methods to determine the $b\to s\gamma$ photon polarization to the LRSM as well as their complementary role compared to the direct search of right-handed charged gauge bosons at LHC.
Near Mass Degeneracy in the Scalar Meson Sector: Implications for $B^*_{(s)0}$ and $B'_{(s)1}$ Mesons
Hai-Yang Cheng,Fu-Sheng Yu
Physics , 2014, DOI: 10.1103/PhysRevD.89.114017
Abstract: The empirical observation of near degeneracy of scalar mesons above 1 GeV, namely, the mass of the strange-flavor scalar meson is similar to that of the non-strange one, is at variance with the naive expectation of the quark model. Qualitatively, the approximate mass degeneracy can be understood as a consequence of self-energy effects due to strong coupled channels which will push down the mass of the heavy scalar meson in the strange sector more than that in the non-strange partner. However, it works in the conventional model without heavy quark expansion, but not in the approach of heavy meson chiral perturbation theory as mass degeneracy and the physical masses of $D_{s0}^*$ and $D_0^*$ cannot be accounted for simultaneously. In the heavy quark limit, near mass degeneracy observed in the scalar charm sector will imply the same phenomenon in the $B$ system. We have the prediction $M_{B_0^*}\approx M_{B_{s0}^*}\approx 5715\,{\rm MeV}+\delta\Delta_S$ based on heavy quark symmetry and the leading-order QCD correction, where $\delta\Delta_S$ arises from $1/m_Q$ corrections. A crude estimate indicates that $\delta\Delta_S$ is of order $-35$ MeV or less. We stress that the closeness of $B_{s0}^*$ and $B_0^*$ masses implied by heavy quark symmetry is not spoiled by $1/m_Q$ or QCD corrections. The mass-shift effect on $K_0^*(1430)$ is discussed.
Great Genetic Differentiation among Populations of Meconopsis integrifolia and Its Implication for Plant Speciation in the Qinghai-Tibetan Plateau
Fu-Sheng Yang, Ai-Li Qin, Yu-Fei Li, Xiao-Quan Wang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0037196
Abstract: The complex tectonic events and climatic oscillations in the Qinghai-Tibetan Plateau (QTP), the largest and highest plateau in the world, are thought to have had great effects on the evolutionary history of the native plants. Of great interest is to investigate plant population genetic divergence in the QTP and its correlation with the geologic and climatic changes. We conducted a range-wide phylogeographical analysis of M. integrifolia based on the chloroplast DNA (cpDNA) trnL-trnF and trnfM-trnS regions, and defined 26 haplotypes that were phylogenetically divided into six clades dated to the late Tertiary. The six clades correspond, respectively, to highly differentiated population groups that do not overlap in geographic distribution, implying that the mountain ranges acting as corridors or barriers greatly affected the evolutionary history of the QTP plants. The older clade of M. integrifolia only occurs in the southwest of the species' range, whereas the distributions of younger clades extend northeastward in the eastern QTP, suggesting that climatic divergence resulting from the uplift of the QTP triggered the initial divergence of M. integrifolia native to the plateau. Also, the nrDNA ITS region was used to clarify the unexpected phylogenetic relationships of cpDNA haplotypes between M. integrifolia and M. betonicifolia. The topological incongruence between the two phylogenies suggests an ancestral hybridization between the two species. Our study indicates that geographic isolation and hybridization are two important mechanisms responsible for the population differentiation and speciation of Meconopsis, a species-rich genus with complex polyploids.
Effect of irrigation method and fertilization dose on photosynthetic physiology of super rice

LIU Yu-Feng,LI Fu-Sheng,

中国生态农业学报 , 2013,
Abstract: To investigate the effect of irrigation and fertilization on photosynthetic physiology of super rice, a pot experiment was conducted using super rice "Zhongzheyou 1" as experimental crop. The study analyzed the photosynthetic physiology parameters net photosynthetic rate,Pn; intercellular CO2 concentration, Ci; photosynthetic light response curve and photosynthetic pigment contents of chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoid (Car), total chlorophyll content (TCC)] of rice under three irrigation methods controlled irrigation (CIR), intermittent irrigation (IIR) and flood irrigation (FIR)] and three fertilization levels non-fertilization (F0), low fertilization (FL) and high fertilization (FH)]. It also conducted correlation analysis for Pn and chlorophyll contents. The results showed that compared with FIR, CIR and IIR treatments (saving-water irrigation methods) significantly increased Pn. It, however, failed to significantly enhance Ci at the jointing, heading and milking stages. Both CIR and IIR increased light saturation point (LSP) by 9.2%~36.8% at the jointing and heading stages and apparent quantum yield by 6.7%~31.5% respectively at the three growth stages, while they decreased light compensation point by 3.2%~12.8% at the jointing, heading and milking stages. Compared with FIR, CIR respectively increased the contents of Chl a, Chl b, Car and TCC by 19.1%~76.3%, 44.5%~98.5%, 31.5%~117.4% and 45.4%~145.0% at the jointing, heading and milking stages. IIR treatment respectively enhanced the contents of Car and TCC by 4.2%~45.8% and 31.5%~117.4% at the three growth stages. Under the three irrigation treatments, photosynthetic indices and photosynthetic pigment contents were higher under fertilization than non-fertilization treatments. High fertilization also resulted in higher photosynthetic indices and photosynthetic pigment content than low fertilization. Correlation analysis showed significant correlation between Pn and photosynthetic pigments contents, which correlations were influenced by growth stages. CIR and IIR improved photosynthetic capacity under strong light, and adaptability to weak light; and significantly increased light utilization rate. Compared with FIR, CIR and IIR increased photosynthetic pigment content but delayed photosynthetic pigment degradation. It was concluded that CIR and IIR treatments enhanced photosynthetic capacity, improved the photosynthetic light response curve and increased photosynthetic pigment contents. In terms of fertilization rate, high fertilization increased photosynthetic capacity of "Zhongzheyou 1" under saving-water irrigation treatments.
Branching ratios and direct CP asymmetries in $D\to PP$ decays
Hsiang-nan Li,Cai-Dian Lu,Fu-Sheng Yu
Physics , 2012, DOI: 10.1103/PhysRevD.86.036012
Abstract: We propose a theoretical framework for analyzing two-body nonleptonic $D$ meson decays, based on the factorization of short-distance (long-distance) dynamics into Wilson coefficients (hadronic matrix elements of four-fermion operators). The parametrization of hadronic matrix elements in terms of several nonperturbative quantities is demonstrated for the $D\to PP$ decays, $P$ denoting a pseudoscalar meson. We consider the evolution of Wilson coefficients with energy release in individual decay modes, and the Glauber strong phase associated with the pion in nonfactorizable annihilation amplitudes, that is attributed to the unique role of the pion as a Nambu-Goldstone boson and a quark-anti-quark bound state simultaneously. The above inputs improve the global fit to the branching ratios involving the $\eta'$ meson, and resolves the long-standing puzzle from the $D^0\to\pi^+\pi^-$ and $D^0\to K^+K^-$ branching ratios, respectively. Combining short-distance dynamics associated with penguin operators and the hadronic parameters determined from the global fit to branching ratios, we predict direct CP asymmetries, to which the quark loops and the scalar penguin annihilation give dominant contributions. In particular, we predict $\Delta A_{\rm CP}\equiv A_{\rm CP}(K^+K^-)-A_{\rm CP}(\pi^+\pi^-)=-1.00\times 10^{-3}$, lower than the LHCb and CDF data.
Nonleptonic two-body decays of charmed mesons
Fu-Sheng Yu,Xiao-Xia Wang,Cai-Dian Lü
Physics , 2011, DOI: 10.1103/PhysRevD.84.074019
Abstract: Nonleptonic decays of charmed mesons into two pseudoscalar mesons or one pseudoscalar meson and one vector meson are studied on the basis of a generalized factorization method considering the resonance effects in the pole model for the annihilation contributions. Large strong phases between different topological diagrams are considered in this work, simply taking the phase in the coefficients $a_i$. We find that the annihilation-type contributions calculated in the pole model are large in both of the $PP$ and $PV$ modes, which make our numerical results agree with the experimental data better than those previous calculations.
The U-Pb Isotopic Age of Zircon from Hongliuhe Ophiolites in East Tianshan Mountains, Northwest China

YU Fu-sheng,LI Jin-bao,WANG Tao,

地球学报 , 2006,
Abstract: The U-Pb isotopic age of zircon from gabbro in Hongliuhe ophiolites is about 425.5±2.3 Ma. This age that can be considered to be the formation time of the gabbro shows that the ophiolites were formed in Early Silurian, corresponding to Gleedonian period of Wenlock. The result indicates that the central Tianshan Mountains were separated from the Tarim plate and formed a discrete terrain in Early Silurian.
Analysis of Two-body Charmed $B$ Meson Decays in Factorization-Assisted Topological-Amplitude Approach
Si-Hong Zhou,Yan-Bing Wei,Qin Qin,Ying Li,Fu-Sheng Yu,Cai-Dian Lu
Physics , 2015, DOI: 10.1103/PhysRevD.92.094016
Abstract: Within the factorization-assisted topological-amplitude approach, we study the two-body charmed $B$ meson decays $B_{u,d,s} \to D^{(*)}M$, with $M$ denoting a light pseudoscalar (or vector) meson. The meson decay constants and transition form factors are factorized out from the hadronic matrix element of topological diagrams. Therefore the effect of SU(3) symmetry breaking is retained, which is different from the conventional topological diagram approach. The number of free nonperturbative parameters to be fitted from experimental data is also much less. Only four universal nonperturbative parameters $\chi^C$, $\phi^C$, $\chi^E$ and $\phi^E$ are introduced to describe the contribution of the color suppressed tree and $W$-exchanged diagrams for all the decay channels. With the fitted parameters from 31 decay modes induced by $b\to c$ transition, we then predict the branching fractions of 120 decay modes induced by both $b\to c$ and $b\to u$ transitions. Our results are well consistent with the measured data or to be tested in the LHCb and Belle-II experiments in the future. Besides, the SU(3) symmetry breaking, isospin violation and $CP$ asymmetry are also investigated.
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