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导子单结合代数及其相联的李代数
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作者 苏育才 《常熟高专学报》 2003年第4期1-6,共6页
介绍二元组(A,D)及其分类结果,其中A为特征零的代数闭域F上具有单位元的交换结合代数,D为由A的交换的局部有限导子组成的有限维空间,并且A为D-单的,即A没有D-不变的非平凡子理想(称这样的A为导子单结合代数);介绍了由导子单结合代数构... 介绍二元组(A,D)及其分类结果,其中A为特征零的代数闭域F上具有单位元的交换结合代数,D为由A的交换的局部有限导子组成的有限维空间,并且A为D-单的,即A没有D-不变的非平凡子理想(称这样的A为导子单结合代数);介绍了由导子单结合代数构造的李代数,特别是Cartan型、Weyl型及Block型无限维非阶化单李代数的结构和表示理论的一些结果,即确定这些李代数的同构类、导子代数、2-上同调群并给出某些不可约表示特别是quasifinite表示的分类. 展开更多
关键词 结合代数 李代数 二元组 非平凡理想 结构 不可约表示 同构 代数
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TUHF代数上的Lie导子
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作者 纪培胜 王琳 《应用泛函分析学报》 CSCD 2004年第2期166-169,共4页
 证明了TUHF代数T上的Lie导子L形如D+τ,其中D是T上的结合导子,τ是从T到它的中心Z上的线性映射且零化T中的括积.
关键词 TUHF代数 LIE 矩阵代数 结合导子
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Capacities of Clay Fraction of a Latosol to Retain Cations and Anions as Inferred from the Wien Effect in Soil Suspensions 被引量:5
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作者 LICHENGBAO S.P.FRIEDMAN ZHAOANZHEN 《Pedosphere》 SCIE CAS CSCD 2003年第2期165-172,共8页
Suspensions of a latosol with a clay concentration of 30 g kg^(-1) wereprepared from electrodialyzed clay fractions, less than 2 μm in diameter, five nitrate solutionswith a concentration of 1 X 10^(04)/z mol L^(-1),... Suspensions of a latosol with a clay concentration of 30 g kg^(-1) wereprepared from electrodialyzed clay fractions, less than 2 μm in diameter, five nitrate solutionswith a concentration of 1 X 10^(04)/z mol L^(-1), where z is the valence, and five sodium saltsolutions with a concentration of 3.3 X 10^(-5)/2 mol L^(-1). The direct current (DC) electricalconductivities (ECs) of the colloidal suspensions were measured at a constant temperature of 25 ℃,using a newly established method of measuring the Wien effect in soil suspensions at field strengthsranging from 13.5 to 150 kV cm^(-1), to determine their electrical conductivity-field strengthrelationships and to infer the order of the bonding strength (retaining force) between soilparticles and various ions. The measurements with the latosol suspensions in NaNO_3, KNO_3,Ca(NO_3)_2, Mg(NO_3)_2 and Zn(NO_3)_2 solutions resulted in increments of the suspension ECs, ΔECs,of 7.9, 5.0, 7.1, 7.0 and 5.8 μS cm^(-1), respectively, when the applied field strength increasedfrom 14.5 to 142 kV cm^(-1). As for the suspensions in NaNO_3, NaCl, Na_2SO_4, Na_3PO_4 andNa_3AsO_4 solutions, the ΔECs were 6.2, 5.3, 4.1, 4.0 and 3.7μS cm^(-1), respectively, when theapplied field strength increased from 13.5 to 90 kV cm^(-1). Thus, it can be deduced that theretaining forces of the clay fraction of the latosol for the cations were in the descending orderK^+ > Zn^(2+) > Mg^(2+) ≥ Ca^(2+) > Na^+, and for the anions in the descending order H_2AsO_4^- >H_2PO_4^-≥ SO_4^(2-) > Cl^- > NO_3~ -. 展开更多
关键词 bonding strength capacity of retaining ions electrical conductivity LATOSOL wien effect in suspensions
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Properties of Excitons Bound to Neutral Donors in GaAs-AlxGa1-xAs Quantum-Well Wires
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作者 DI Bing LIU Jian-Jua 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第5期945-949,共5页
In the effective-mass approximation, using a simple two-parameter wave function and a one-dimensional (ID) equivalent potential model, we calculate variationally the binding energy of an exciton bound to a neutral d... In the effective-mass approximation, using a simple two-parameter wave function and a one-dimensional (ID) equivalent potential model, we calculate variationally the binding energy of an exciton bound to a neutral donor (D^0, X) in finite GaAs-AIxGa1-xAs quantum well wires (QWWs). At the wire width of 25 A, the binding energy has a peak value, which is also at the position of the peak of the exciton binding energy, and the center-of-mass wave functions of excitons reaches the most centralized distribution. In addition, the changing tendency of the average interparticle distance as the wire width is reverse to that of the binding energy. 展开更多
关键词 quantum-well wires excitons bound to a neutral donor binding energy
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Simultaneous Effects of Hydrostatic Pressure and Conduction Band Non-parabolicity on Binding Energies and Diamagnetic Susceptibility of a Hydrogenic Impurity in Spherical Quantum Dots 被引量:1
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作者 G.Rezaei N.A.Doostimotlagh B.Vaseghi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第8期377-381,共5页
Simultaneous effects of conduction band non-parabolicity and hydrostatic pressure on the binding energies of 1S, 2S, and 2P states along with diamagnetic susceptibility of an on-center hydrogenic impurity confined in ... Simultaneous effects of conduction band non-parabolicity and hydrostatic pressure on the binding energies of 1S, 2S, and 2P states along with diamagnetic susceptibility of an on-center hydrogenic impurity confined in typical GaAs/Alx- Ga1-x As spherical quantum dots are theoretically investigated using the matrix diagonalization method. In this regard, the effect of band non-parabolieity has been performed using the Luttinger-Kohn effective mass equation. The binding energies and the diamagnetic susceptibility of the hydrogenic impurity are computed as a function of the dot radius and different values of the pressure in the presence of conduction band non-parabolicity effect. The results we arrived at are as follows: the incorporation of the band edge non-parabolicity increases the binding energies and decreases the absolute value of the diamagnetic susceptibility for a given pressure and radius; the binding energies increase and the magnitude of the diamagnetic susceptibility reduces with increasing pressure. 展开更多
关键词 non-parabolic conduction band hydrostatic pressure quantum dots hydrogenic impurity diamagnetic susceptibility
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Influences of a Side-Coupled Triple Quantum Dot on Kondo Transport Through a Quantum Dot
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作者 江兆潭 杨彦楠 秦志杰 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第11期925-932,共8页
Kondo transport properties through a Kondo-type quantum dot (QD) with a side-coupled triple-QD structure are systematically investigated by using the non-equilibrium Green's function method. We firstly derive the f... Kondo transport properties through a Kondo-type quantum dot (QD) with a side-coupled triple-QD structure are systematically investigated by using the non-equilibrium Green's function method. We firstly derive the formulae of the current, the linear conductance, the transmission coefficient, and the local density of states. Then we carry out the analytical and numerical studies and some universal conductance properties are obtained. It is shown that the number of the conductance valleys is intrinsically determined by the side-coupled QDs and at most equal to the number of the QDs included in the side-coupled structure in the asymmetric limit. In the process of forming the conductance valleys, the side-coupled QD system plays the dominant role while the couplings between the Kondo-type QD and the side-coupled structure play the subsidiary and indispensable roles. To testify the validity of the universal conductance properties, another different kinds of side-coupled triple-QD structures are considered. It should be emphasized that these universal properties axe applicable in understanding this kind of systems with arbitrary many-QD side structures. 展开更多
关键词 Kondo effect quantum dots
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ON THE VARIATIONS OF G_2 被引量:2
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作者 LIU DONG LIN LEI Department of Mathematics, East China Normal University, Shanghai 200062, China. Department of Mathematics, East China Normal University, Shanghai 200062, China. 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2003年第3期387-394,共8页
In [1], Shen Guangyu constructed several classes of new simple Lie algebras of characteristic 2, which are called the variations of G2. In this paper, the authors investigate their derivation algebras. It is shown tha... In [1], Shen Guangyu constructed several classes of new simple Lie algebras of characteristic 2, which are called the variations of G2. In this paper, the authors investigate their derivation algebras. It is shown that G2 and its variations all possess unique nondegenerate associative forms. The authors also find some nonsingular derivations of ViG for i = 3,4, 5, 6, and thereby construct some left-symmetric structures on Vi G for i = 3,4,5,6. Some errors about the variations of sl(3, F) in [1] are corrected. 展开更多
关键词 Variation DERIVATION Associative form Left-symmetric structure
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Quantum transport in topological insulator hybrid structures-A combination of topological insulator and superconductor 被引量:3
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作者 OU YongXi SINGH Meenakshi WANG Jian 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第12期2226-2236,共11页
In this paper,a brief review of the history of topological insulators is given.After that,electronic transport experiments in topological insulator-superconductor hybrid structures,including experimental methods,physi... In this paper,a brief review of the history of topological insulators is given.After that,electronic transport experiments in topological insulator-superconductor hybrid structures,including experimental methods,physical properties and seemingly contradictory observations are discussed.Additionally,some new topological insulator hybrid structures are proposed. 展开更多
关键词 topological insulator transport property SUPERCONDUCTOR hybrid structure surface state
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Screening and regulatory network analysis of survival-related genes of patients with colorectal cancer 被引量:4
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作者 QI Lu DING YanQing 《Science China(Life Sciences)》 SCIE CAS 2014年第5期526-531,共6页
The purpose of this study was to screen key survival-related genes from patients with colorectal cancer and explore signal transduction network of the involved genes.In a previous study,survival-related genes of patie... The purpose of this study was to screen key survival-related genes from patients with colorectal cancer and explore signal transduction network of the involved genes.In a previous study,survival-related genes of patients with colorectal cancer were selected by colorectal cancer-related expression data GSE17538 using the Significance Analysis of Microarrays(SAM3.01)software,and 235 genes related to the survival of patients with colorectal cancer were obtained.Therefore,the following screening and analysis were conducted on these 235 genes in this study.First,the enrichment analysis of transcription factor binding sites was conducted on the 235 genes.Genes with more than seven transcription factor binding sites were screened.Then,these genes and upregulated genes in colorectal cancer were intersected.Finally,survival analysis and regulatory network analysis were conducted on the screened genes.This allowed clarification of the relationship between these genes and the survival of patients with colorectal cancer and the signaling network involving these genes in the cell signal transduction network of colorectal cancer.Through the above analysis,six upregulated genes in colorectal cancer related to the survival of colorectal cancer patients and highly regulated by transcription factors were selected,namely STX2,PODXL,KLK6,GRB10,EHBP1 and CREB5.These genes are involved in signal regulatory networks related to colorectal cancer metastasis-related signaling pathways.Therefore,the survival of patients with colorectal cancer is closely correlated with colorectal cancer metastasis.The six survival-related genes affect the survival of patients by regulating colorectal cancer metastasis-associated signaling pathways. 展开更多
关键词 survival time colorectal cancer transcription factor BIOINFORMATICS
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Structure,magnetic properties and magnetocaloric effects of Fe_(50)Mn_(15-x)Co_xNi_(35) alloys
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作者 ZHONG XiChun TIAN HuaCun +3 位作者 TANG PengFei LIU ZhongWu ZHENG ZhiGang ZENG DeChang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第3期437-441,共5页
FesoMn15-xCoxNi35 (x=0, 1, 3, 5, 7) alloys were prepared by arc melting under purified argon atmosphere. The ingots were homogenized at 930℃ for 90 h followed by water quenching. The crystal structure, magnetic pro... FesoMn15-xCoxNi35 (x=0, 1, 3, 5, 7) alloys were prepared by arc melting under purified argon atmosphere. The ingots were homogenized at 930℃ for 90 h followed by water quenching. The crystal structure, magnetic properties and magnetocaloric effects of the alloys were studied by X-ray diffraction (XRD) and MPMS-7-type SQUID. The results show that all samples still maintained a single γ-(Fe, Ni)-type phase structure. With the increase of the content of Co, the Curie temperatures of these alloys increased and exhibited a second-order magnetic transition from ferromagnetic (FM) to paramagnetic (PM) state near Curie temperature. The maximum magnetic entropy change and the relative cooling power of Fe50Mn10CosNi35 alloy was 2.55 J/kg.K and 181 J/kg, respectively, for an external field change of 5 T. Compared with rare earth metal Gd, FesoMnls-xCoxNi35 series of alloys have obvious advantage in resource price; their Curie temperatures can be tuned to near room temperature, maintain a relatively large magnetic entropy change at the same time and they are a type of potential magnetic refrigeration materials near room temperature. 展开更多
关键词 Fes0Mnl5-xCoxNi35 alloys magnetic refrigeration Curie temperature magnetocaloric effect
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Solvent-molecule interaction induced gating of charge transport through single-molecule junctions
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作者 Zheng Tang Songjun Hou +10 位作者 Qingqing Wu Zhibing Tan Jueting Zheng Ruihao Li Junyang Liu Yang Yang Hatef Sadeghi Jia Shi Iain Grace Colin JLambert Wenjing Hong 《Science Bulletin》 SCIE EI CAS CSCD 2020年第11期944-950,M0004,共8页
To explore solvent gating of single-molecule electrical conductance due to solvent-molecule interactions, charge transport through single-molecule junctions with different anchoring groups in various solvent environme... To explore solvent gating of single-molecule electrical conductance due to solvent-molecule interactions, charge transport through single-molecule junctions with different anchoring groups in various solvent environments was measured by using the mechanically controllable break junction technique. We found that the conductance of single-molecule junctions can be tuned by nearly an order of magnitude by varying the polarity of solvent. Furthermore, gating efficiency due to solvent–molecule interactions was found to be dependent on the choice of the anchor group. Theoretical calculations revealed that the polar solvent shifted the molecular-orbital energies, based on the coupling strength of the anchor groups. For weakly coupled molecular junctions, the polar solvent–molecule interaction was observed to reduce the energy gap between the molecular orbital and the Fermi level of the electrode and shifted the molecular orbitals. This resulted in a more significant gating effect than that of the strongly coupled molecules. This study suggested that solvent–molecule interaction can significantly affect the charge transport through single-molecule junctions. 展开更多
关键词 Solvent-induced gating Molecular electronics Single-molecule conductance Break junctions
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