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Search Results: 1 - 10 of 171635 matches for " LI Yan-feng "
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Poly[[hexa-μ-aqua-diaquabis(μ4-dihydrogen benzene-1,2,4,5-tetracarboxylato)magnesiumdisodium] dihydrate]
Dan Zhao,Peng Liang,Yan-Feng Li,Sen Qiu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812024634
Abstract: The asymmetric unit of the title compound, {[MgNa2(C10H4O8)2(H2O)8]·2H2O}n, contains one octahedrally coordinated MgII atom (site symmetry 2/m), one octahedrally coordinated NaI atom (site symmetry 2) and one half of the dihydrogen benzene-1,2,4,5-tetracarboxylate (btec) ligand, the second half of the ligand being generated by a twofold rotation axis. The basic framework of the title compound features infinite (–Na–Na–Mg–)n chains along [10-1] with the metal cations bridged by the coordinating water molecules. The chains are isolated from each other by μ4-bridging btec ligands, which form intermolecular O—H...O hydrogen bonds to uncoordinated water molecules and the coordinated water molecules of a neighbouring chain. In each btec ligand, there are also intramolecular O—H...O hydrogen bonds.
Yan-Feng Tang,Jin-Li Zhu
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808032698
Abstract: The title compound, [Fe2(C9H11NS2){Fe(C5H5)(C17H14P)}(CO)5], was prepared as an azadithiolato–iron model for the iron-only hydrogenase active site. The Fe2S2 unit exhibits a butterfly conformation and the ferrocenyldiphenylphosphine ligand is trans to the Fe—Fe bond. The Fe—Fe distance of 2.5160 (8) is longer than found in related model structures. Intramolecular C—H...S and intermolecular C—H...O hydrogen bonds are observed.
On the minimal affinizations of type $F_4$
Bing Duan,Jian-Rong Li,Yan-Feng Luo
Mathematics , 2015,
Abstract: In this paper, we apply the theory of cluster algebras to study minimal affinizations for the quantum affine algebra of type $F_4$. We show that the $q$-characters of a large family of minimal affinizations of type $F_4$ satisfy a system of equations. Moreover, a minimal affinization in this system corresponds to some cluster variable in some cluster algebra $\mathscr{A}$. For the other minimal affinizations of type $F_4$ which are not in this system, we give some conjectural equations which contains these minimal affinizations. Furthermore, we introduce the concept of dominant monomial graphs to study the equations satisfied by $q$-characters of modules of quantum affine algebras.
Cluster algebras and snake modules
Bing Duan,Jian-Rong Li,Yan-Feng Luo
Mathematics , 2015,
Abstract: Snake modules are a family of modules of quantum affine algebras which were introduced by Mukhin and Young. The aim of this paper is to prove that the Hernandez--Leclerc conjecture is true for snake modules of types $A_{n}$ and $B_{n}$. We prove that prime snake modules are real. We introduce $S$-systems consisting of equations satisfied by the $q$-characters of prime snake modules in types $A_{n}$ and $B_{n}$. Moreover, we show that every equation in the $S$-system of type $A_n$ (respectively, $B_n$) corresponds to a mutation in some cluster algebra $\mathscr{A}$ (respectively, $\mathscr{A}'$) and every prime snake module of type $A_n$ (respectively, $B_n$) corresponds to some cluster variable in $\mathscr{A}$ (respectively, $\mathscr{A}'$). In particular, this proves that the Hernandez--Leclerc conjecture is true for all snake modules of types $A_{n}$ and $B_{n}$.
Yan-Feng Xiao,Hong-Feng Li,Peng-Fei Yan,Guang-Ming Li
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809016353
Abstract: The asymmetric unit of the title compound, [Fe4(C9H8O2)4(CH3OH)2], contains one half-molecule located on a twofold rotational axis. In the molecule, the two FeII ions bridged by two coordinating methanol molecules are separated by 3.1286 (7) . Two crystallographically independent methanol molecules are situated on a twofold rotational axis; all attached H atoms are rotationally disordered between two equal orientations.
Solvent-free Synthesis of Nitriles from Aldehydes Catalyzed by KF/Al2O3, Montmorillonite KSF and K10
Li-Jun Li,Ying-Xia Song,Yan-Su Gao,Yan-Feng Li
Journal of Chemistry , 2006, DOI: 10.1155/2006/709594
Formation and characterization of metallic iron grains in coal-based reduction of oolitic iron ore
Yong-sheng Sun,Yue-xin Han,Yan-feng Li,Yan-jun Li
- , 2017, DOI: https://doi.org/10.1007/s12613-017-1386-5
Abstract: To reveal the formation and characteristics of metallic iron grains in coal-based reduction, oolitic iron ore was isothermally reduced in various reduction times at various reduction temperatures. The microstructure and size of the metallic iron phase were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and a Bgrimm process mineralogy analyzer. In the results, the reduced Fe separates from the ore and forms metallic iron protuberances, and then the subsequent reduced Fe diffuses to the protuberances and grows into metallic iron grains. Most of the metallic iron grains exist in the quasi-spherical shape and inlaid in the slag matrix. The cumulative frequency of metallic iron grain size is markedly influenced by both reduction time and temperature. With increasing reduction temperature and time, the grain size of metallic iron obviously increases. According to the classical grain growth equation, the growth kinetic parameters, i.e., time exponent, growth activation energy, and pre-exponential constant, are estimated to be 1.3759 ± 0.0374, 103.18 kJ·mol?1, and 922.05, respectively. Using these calculated parameters, a growth model is established to describe the growth behavior of metallic iron grains.
Fabrication and Characterization of Manganese Ferrite Nanospheres as a Magnetic Adsorbent of Chromium
Li-Xia Yang,Feng Wang,Yan-Feng Meng,Qing-Hua Tang
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/293464
On the minimal affinizations over the quantum affine algebras of type $C_n$
Xin-Yang Feng,Jian-Rong Li,Yan-Feng Luo
Mathematics , 2015,
Abstract: In this paper, we study the minimal affinizations over the quantum affine algebras of type $C_n$ by using the theory of cluster algebras. We show that the $q$-characters of a large family of minimal affinizations of type $C_n$ satisfy some systems of equations. These equations correspond to mutation equations of some cluster algebras. Furthermore, we show that the minimal affinizations in these equations correspond to cluster variables in these cluster algebras.
Film Thickness Dependence of Rectifying Properties of La1.85Sr0.15CuO4/Nb-SrTiO3 Junctions

CHEN Lei-Ming,LI Guang-Cheng,ZHANG Yan,GUO Yan-Feng,

中国物理快报 , 2010,
Abstract: In this work, p-n junctions are made from directly depositing optimal doped La1.85Sr0.15CuO4 (LSCO) films on n-type Nb-doped SrTiO3 substrates. Film thickness controlled rectifying behaviors are strikingly displayed. The starting points of the diffusion voltage reduction Vd-on change clearly with varying film thickness. Vd-on and TC coincide with each other when the film thickness is larger than 300 nm, indicating a close relation between the two parameters. However, when the film is very thin (<350 nm) a departure between the two parameters was also observed. A possible reason for this is discussed within the framework of an inhomogeneous Schottky contact. Enhanced interface inhomogeneity due to the tensile strain appears to be the origin.
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