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Search Results: 1 - 10 of 223541 matches for " Liu F. "
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Recent Psi(2S) Results at BES
F. Liu
Physics , 1999, DOI: 10.1016/S0375-9474(00)00216-5
Abstract: Based on $(3.79\pm0.31)\times10^6 ~\psi'$ data sets collected with the BES detector at BEPC, the recent $\psi'$, $\chi_{cJ}$ and $\eta_c$ results from BES are presented. Some results are compared with NRQCD.
Analysis of Road Embankment Slope Stability  [PDF]
Chunyuan Liu, Ulysse Sèho F. Hounsa
Open Journal of Civil Engineering (OJCE) , 2018, DOI: 10.4236/ojce.2018.82010
Abstract: The stability of earthworks (cuttings, embankments, dikes) and natural slopes is a?problem that is of concern to geotechnicians, both practitioners and researchers. The disorders generated by breaking the slopes are usually spectacular, often destructive and sometimes murderers. Many methods of calculating stability have been proposed. These are differentiated?by the assumptions accepted by their authors (methods of calculation in equilibrium limit, methods of calculation at break, deformation calculation methods) and the ease of their implementation (calculations using charts, automatic calculations using software), but they all agree to define an overall factor of safety according to which the stability?of?the studied slope is considered to be insured or compromised, or by safety factor spartial effects on the one hand, applied stresses and, on the other hand, the mechanical properties soil. Various embankment strengthening techniques have been developed. They are differentiated by the process of their realization, their cost and their durability. The main objective of this study is to present the problems of both natural and artificial slope stability on construction projects. In this regard, special emphasis?is given to the sensitivity of the calculation model input parameters (soil, load),?which should contribute to raising awareness about this issue, as a prerequisite to make the right decisions and optimal technical solutions in this area.
Speciation and Mobility of Phosphate in the Eutrophic Ponds at Prospect Park, Brooklyn, New York, USA  [PDF]
Ying Liu, Zhongqi Cheng, Brett F. Branco, John F. Marra
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.56004
The water system at the Prospect Park ponds of Brooklyn, NY has been receiving chronic loads of orthophosphate from the municipal water since the mid ’90s. The ponds are currently eutrophic with degraded water quality and high levels of P in the sediment. In this study, the distribution and speciation of P within the water column was examined. The dominant form of P in the water was found as soluble reactive phosphate (SRP) and the temporal change of SRP indicated significant internal loading from the sediment during late summer in the ponds downstream. Lake sediment was investigated for P fractionation and phosphate bound to Fe-hydroxides was the dominant form of P in the sediment. Both external and internal P pools are important and should be taken into consideration when planning for restoration.
An entropic regularization method for solving systems of fuzzy linear inequalities
F. B. Liu
International Journal of Mathematics and Mathematical Sciences , 2002, DOI: 10.1155/s0161171202204196
Abstract: Solving systems of fuzzy linear inequalities could lead to the solutions of fuzzy linear programs. It is shown that a system of fuzzy linear inequalities can be converted to a regular min-max problem. An entropic regularization method is introduced for solving such a problem. Some computational results are included.
Medical Monographs: A Comparison of Core Lists and Their Potential Uses in Taiwan
  Ellen F. Liu
Journal of Library and Information Science , 1982,
Abstract: 頁次:174-194
Axillary Bud Proliferation Approach for Plant Biodiversity Conservation and Restoration
F. Ngezahayo,B. Liu
International Journal of Biodiversity , 2014, DOI: 10.1155/2014/727025
Abstract: Due to mainly human population pressure and activities, global biodiversity is getting reduced and particularly plant biodiversity is becoming at high risk of extinction. Consequently, many efforts have been deployed to develop conservation methods. Because it does not involve cell dedifferentiation of differentiated cells but rather the development and growth of new shoots from preexisting meristems, the axillary bud proliferation approach is the method offering least risk of genetic instability. Indeed, meristems are more resistant to genetic changes than disorganized tissues. The present review explored through the scientific literature the axillary bud proliferation approach and the possible somaclonal variation that could arise from it. Almost genetic stability or low level of genetic variation is often reported. On the contrary, in a few cases studied to date, DNA methylation alterations often appeared in the progenies, showing epigenetic variations in the regenerated plants from axillary bud culture. Fortunately, epigenetic changes are often temporary and plants may revert to the normal phenotype. Thus, in the absence of genetic variations and the existence of reverting epigenetic changes over time, axillary bud culture can be adopted as an alternative nonconventional way of conserving and restoring of plant biodiversity. 1. Introduction Global biodiversity is defined as the variation of all life on earth and the ecological complexes in which it occurs [1]. Biodiversity refers to genetic diversity, species diversity, and ecosystem diversity [2, 3] and includes the forest and agricultural ecosystems and the wild animals [4]. Among the above components, plants represent a vital part of biodiversity and healthy ecosystems. They provide multiple ecosystem services including production of oxygen for the rest of living organisms [5, 6], removal of atmospheric carbon dioxide emissions in the photosynthesis process, creation and stabilization of soil, protection of watersheds, and provision of natural resources including food, fibre, fuel, shelter, and medicine [7]. They also play an important role in the water cycle and constitute habitat for a wide range of other living organisms. Thus, plants are the basis for life on earth and humans are quite dependent on them [8–10] given that they are fundamental structural and nutrient-sequestering components of most ecosystems. Due to dependency on biodiversity, the number of threatened plant species has gradually increased during the last decade, the maximum being observed in 2011 [11]. The key factor in
Polytropic gas spheres: An approximate analytic solution of the Lane-Emden equation
F. K. Liu
Physics , 1995, DOI: 10.1093/mnras/281.4.1197
Abstract: Polytropic models play a very important role in galactic dynamics and in the theory of stellar structure and evolution. However, in general, the solution of the Lane-Emden equation can not be given analytically but only numerically. In the Lane-Emden equation can not be given analytically but only numerically. In this paper we give a very good and simple analytic approximate solution of the Lane-Emden equation. This approximation is very good for any finite polytropic index $n$ and for the isothermal case (n equals infinity) at a level $<1\%$. We also give analytic expressions of the mass, pressure, temperature, and potential energy as a function of radius.
Comparing neutron star predictions by various microscopic models
F. Sammarruca,Pei Liu
Physics , 2009,
Abstract: We calculate several neutron star properties, for static and/or rotating stars, using equations of state based on different microscopic models. These include our Dirac-Brueckner-Hartree-Fock model and others derived from the non-relativistic Brueckner-Hartree-Fock approach implemented with microscopic three-body forces. The model dependence is discussed.
Charge-dependent Azimuthal Correlations in Relativistic Heavy-ion Collisions and Electromagnetic Effects
K. F. Liu
Physics , 2011, DOI: 10.1103/PhysRevC.85.014909
Abstract: We propose a scenario where the pattern of the recently observed charge-dependent azimuthal correlations can be understood qualitatively. This is based on the cluster picture and the assumption that the charged hadrons that flow outward from the surface of the overlapping region of the colliding nuclei move primarily parallel to the reaction plane. We also point out the there is a strong electric field induced by the transient magnetic field during the parton production in the initial phase of the relativistic heavy-ion collision and discuss its possible relevance to the scenario.
Precision Measurements of the Semileptonic Charm Decays $D^0 \to π^- \ell^+ ν$ and $D^0 \to K^- \ell^+ ν$
F. Liu,for the CLEO Collaboration
Physics , 2004, DOI: 10.1142/S0217751X05027035
Abstract: We investigate the decays $D^0\to\pi^-\ell^+\nu$ and $D^0\to K^-\ell^+ \nu$, where $\ell$ is $e$ or $\mu$, using approximately 7 ${\rm fb}^{-1}$ of data collected with the CLEO III detector. We find $R_0\equiv {\cal B}(D^0\to \pi^-e^+\nu)/{\cal B}(D^0\to K^-e^+\nu)= 0.082 \pm 0.006 \pm 0.005$. Fits to the kinematic distributions of the data provide parameters describing the form factor of each mode. Combining the form factor results and $R_0$ gives $|f^{\pi}_{+}(0)|^2 |V_{cd}|^2/|f^K_{+}(0)|^2 |V_{cs}|^2 = 0.038^{+0.006+0.005}_{-0.007-0.003}$.
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