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Search Results: 1 - 10 of 20156 matches for " Fei Ye "
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Iterative Reweighted l1 Penalty Regression Approach for Line Spectral Estimation  [PDF]
Fei Ye, Xian Luo, Wanzhou Ye
Advances in Pure Mathematics (APM) , 2018, DOI: 10.4236/apm.2018.82008
Abstract: In this paper, we proposed an iterative reweighted l1penalty regression approach to solve the line spectral estimation problem. In each iteration process, we first use the ideal of Bayesian lasso to update the sparse vectors; the derivative of the penalty function forms the regularization parameter. We choose the anti-trigonometric function as a penalty function to approximate the?l0 norm. Then we use the gradient descent method to update the dictionary parameters. The theoretical analysis and simulation results demonstrate the effectiveness of the method and show that the proposed algorithm outperforms other state-of-the-art methods for many practical cases.
Fractional excitation in one-dimensional two species fermionic superfluids
Fei Ye
Physics , 2015,
Abstract: We study one-dimensional two-species fermionic superfluids with order parameter twisted by an angle $\varphi$ at the two ends. By solving the corresponding Bogoliubov-de-Gennes equation, we obtain the U(1) soliton state which turns out to carry $\varphi S/(2\pi)$ spin, where $S$ is the spin of single fermion. For $Z_2$ soliton with $\varphi=\pi$, the localized state carries only $1/2$ of a single fermion spin. To conserve the total spin of the system as an integal multiple of $S$, we demonstrate, the localized fractional spin $\varphi S/(2\pi)$ can be compensated by an opposite total spin $-\varphi S/(2\pi)$, which distributes uniformly in space and is thus undetectable locally in the thermodynamic limit.
Classification of Moduli Spaces of Arrangements of 9 Projective Lines
Fei Ye
Mathematics , 2011,
Abstract: In this paper, we present a proof that the list of the classification of arrangements of 9 lines by Nazir and Yoshinaga is complete.
Corporate Governance, Institutional Environment, Behavioral Corporate Finance and Inefficient Investment  [PDF]
Qi-An Luo, Hong-Fei Ye
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.83046
Abstract: This paper is the literature review of extensive literature about how inefficient investment is influenced. It discusses in three factors: corporate governance, institutional environment and behavioral corporate finance. Academics concern how the conflicts of shareholders and creditors, shareholders and managers, controlling shareholders and minority shareholders cause inefficient investment through the game. However, an enterprise is not isolated, it operates in various connections with external institutional environment. Academics interest in how formal institution such as legal environment, financial system, government intervention and informal institution like political connection impact inefficient investment. Besides, human behaviors have certain social and individual psychology background, then the crossover study of corporate finance and psychology gradually becomes a cutting-edge issue. The paper concludes the effects of investor psychology on inefficient investment by classifying psychological bias derived from investment decisions, investment execution and investment performance feedback.
The Anisotropic Cell Model in the Colloidal Plasmas
Qizheng Ye;Fei Lu
PIER , 2010, DOI: 10.2528/PIER09112401
Abstract: The anisotropic spherical Wigner-Seitz (WS) cell model --- introduced to describe colloidal plasmas --- is investigated using the linearized Poisson-Boltzmann (PB) equation. As an approximation, the surface potential of the spherical macroparicle expanded in terms of the monopole () and the dipole () is considered as an anisotropic boundary condition of the linear PB equation. Here, the "apparent" moments and are the moments 'seen' in the microion cloud, respectively. Based on a new physical concept, the momentneutrality, the potential around the macroparticle can be solvable analytically if the relationship between the actual moment and the "apparent" moment can be obtained according to the momentneutrality condition in addition to the usual electroneutrality. The calculated results of the potential show that there is an attractive region in the vicinity of macroparticle when the corresponding dipole part of the potential dominates over the monopole part, and there is an attractive region and a repulsive region at the same time, i.e., a potential well, when the corresponding dipole part of the potential just comes into play. It provides the possibility and the conditions of the appearance of periodic structure of the colloidal plasmas, although it is a result of a simple theoretical model.
Diaquatetrabromidotin(IV) trihydrate
Fei Ye,Hans Reuter
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812036434
Abstract: The title compound, [SnBr4(H2O)2]·3H2O, forms large colourless crystals in originally sealed samples of tin tetrabromide. It constitutes the first structurally characterized hydrate of SnBr4 and is isostructural with the corresponding hydrate of SnCl4. It is composed of SnIV atoms octahedrally coordinated by four Br atoms and two cis-related water molecules. The octahedra exhibit site symmetry 2. They are arranged into columns along [001] via medium–strong O—H...O hydrogen bonds involving the two lattice water molecules (one situated on a twofold rotation axis) while the chains are interconnected via longer O—H...Br hydrogen bonds, forming a three-dimensional network.
Redetermination of dipotassium trichloridostannate(II) chloride monohydrate
Fei Ye,Hans Reuter
Acta Crystallographica Section E , 2013, DOI: 10.1107/s1600536813001372
Abstract: The title compound, K2[SnCl3]Cl·H2O, is the prototype of some isostructural compounds of composition M2[SnX3]X·H2O (M = large monovalent cation; X = halogen). In comparison with a previous study based on photographic data [Kamenar & Grdeni (1962). J. Inorg. Nucl. Chem. 24, 1039–1045], its crystal structure has now been redetermined using CCD-based data in order to gain more accurate values for bond lengths and angles within the [SnCl3] anion and to locate the H atoms. The [SnCl3] anion has a trigonal–pyramidal shape and exhibits crystallographic mirror symmetry. With the exception of the K+ ion which is located on a general position, all other atoms are situated on crystallographic mirror planes. The coordination polyhedron of the cation may be described by means of nine atoms in the form of a monocapped square antiprism with seven typical K—Cl/O distances and two additional atoms at considerably longer distances. The positions of the H atoms of the water molecule (also lying on a crystallographic mirror plane) could be determined and confirm the existence of a bifurcated O—H...Cl hydrogen bond to neighbouring Cl atoms.
Ying Fu,Fei Ye
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811027176
Abstract: In the title molecule, C12H18Cl2N2O2, the six-membered ring is in a chair conformation and the five-membered ring is in an envelope conformation. In the crystal, weak intermolecular bifurcated (C—H)2...O hydrogen bonds connect molecules into chains along [010].
Partner Selection in a Virtual Enterprise: A Group Multiattribute Decision Model with Weighted Possibilistic Mean Values
Fei Ye,Qiang Lin
Mathematical Problems in Engineering , 2013, DOI: 10.1155/2013/519629
Abstract: This paper proposes an extended technique for order preference by similarity to ideal solution (TOPSIS) for partner selection in a virtual enterprise (VE). The imprecise and fuzzy information of the partner candidate and the risk preferences of decision makers are both considered in the group multiattribute decision-making model. The weighted possibilistic mean values are used to handle triangular fuzzy numbers in the fuzzy environment. A ranking procedure for partner candidates is developed to help decision makers with varying risk preferences select the most suitable partners. Numerical examples are presented to reflect the feasibility and efficiency of the proposed TOPSIS. Results show that the varying risk preferences of decision makers play a significant role in the partner selection process in VE under a fuzzy environment. 1. Introduction A virtual enterprise (VE) is a type of temporary alliance of independent, geographically dispersed organizations that aim to share skills and resources to exploit low-cost fast-changing market opportunities and achieve high-quality customer satisfaction [1–6]. VEs have become prevalent because of the increasing customer demands in the present global economy and the increasing complexity and diminishing life cycle of products. A VE is formed and dissolved by the appearance and disappearance of market opportunities, respectively. A VE faces many important issues throughout its life cycle. Given the role of partners in the success of a VE, the proper selection of partners has received considerable research attention. Literature on partner selection can be divided into two categories. The first literature category involves the information environment, wherein the verdicts of decision makers on candidate partners can be expressed in precise values. Various approaches have been proposed for VE partner selection. Talluri and Baker [7] proposed a two-phase mathematics programming method. Wu et al. [8] developed an integer-programming method to minimize the transportation cost by geographic position and transportation approach. Ip et al. [1] described a risk-based partner selection problem and developed a mathematical programming model. Jarimo and Pulkkinen [9] presented a mixed-integer linear programming model to configure the virtual organization. Zhao et al. [10] developed a nonlinear integer-programming model to solve VE partner selection problems with precedence and due date constraints. Ng [11] proposed a weighted linear program to solve the multicriteria supplier selection problem. Other researchers simultaneously
Plasmon modes in the magnetically doped Single Layer and Multilayers of Helical Metals
Fei Ye,Chaoxing Liu
Physics , 2013, DOI: 10.1103/PhysRevB.87.115434
Abstract: We study the plasmon excitations and the electromagnetic response of the magnetically doped single layer and multilayer of ``helical metals'', which emerge at the surfaces of topological insulators. For the single layer case, we find a ``spin-plasmon'' mode with the rotating spin texture due to the combination of the spin-momentum locking of ``helical metals'' and the Hall response from magnetization. For the multilayers case, we investigate the electromagnetic response due to the plasmon excitations, including the Faraday rotation for the light propagating normal to the helical metal layers and an additional optical mode with the frequency within the conventional plasmon gap for the light propagating along the helical metal layers.
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