The c-axis charge transport of the hole doped triangular antiferromagnet is investigated within the t-J model by considering the incoherent interlayer hopping. It is shown that the c-axis charge transport of the hole ...The c-axis charge transport of the hole doped triangular antiferromagnet is investigated within the t-J model by considering the incoherent interlayer hopping. It is shown that the c-axis charge transport of the hole doped triangular antiferromagnet is essentially determined by the scattering from the in-plane fluctuation. The c-axis conductivity spectrum shows a low-energy peak and the unusual high-energy broad band, while the c-axis resistivity is characterized by a crossover from the high temperature metallic-like behavior to the low temperature insulating-like behavior, which is qualitatively consistent with those of the hole doped square lattice antiferromagnet.展开更多
Within the charge-spin separation fermion-spin theory, we show that themechanism of superconductivity in the electron doped cobaltate Na_x CoO_2 · gH_2O is ascribed toits kinetic energy. The dressed fermions inte...Within the charge-spin separation fermion-spin theory, we show that themechanism of superconductivity in the electron doped cobaltate Na_x CoO_2 · gH_2O is ascribed toits kinetic energy. The dressed fermions interact occurring directly through the kinetic energy byexchanging magnetic excitations. This interaction leads to a net attractive force between dressedfermions, then the electron Cooper pairs originating from the dressed fermion pairing state are dueto the charge-spin recombination, and their condensation reveals the superconducting ground state.The superconducting transition temperature is identical to the dressed fermion pair transitiontemperature, and is suppressed to a lower temperature due to the strong magnetic frustration. Theoptimal superconducting transition temperature occurs in the electron doping concentration δ ≈0.29, and then decreases for both underdoped and overdoped regimes, in qualitative agreement withthe experimental results.展开更多
An adsorbent with good adsorption perform-ance for binding low density lipoprotein (LDL) was synthe-sized through a simple preparation procedure. The phase-inversion technique was employed to form macropor-ous chitosa...An adsorbent with good adsorption perform-ance for binding low density lipoprotein (LDL) was synthe-sized through a simple preparation procedure. The phase-inversion technique was employed to form macropor-ous chitosan beads, which were then simultaneously acti-vated, cross-linked and connected with a long spacer arm via the reaction with ethyleneglycol diglycidylether (EGDE). Tryptophan (Trp) was subsequently coupled to the ep-oxy-activated beads. This adsorbent demonstrated satisfac-tory adsorption capacity and selectivity for LDL, and it also exhibited excellent blood compatibility. The effect of spacer arms with different length on the adsorption selectivity was investigated experimentally, and the mechanism was ana-lyzed.展开更多
Background This study aimed at investigating the change and significance of nuclear factorκB (NFκB) in cardiomyopathy induced by adriamycin (ADR) in ratsMethods Sixty male Wistar rats were randomly divided into thre...Background This study aimed at investigating the change and significance of nuclear factorκB (NFκB) in cardiomyopathy induced by adriamycin (ADR) in ratsMethods Sixty male Wistar rats were randomly divided into three groups: control, ADR and ADR+pyrrolidine dithiocarbamate (PDTC) groups After 30day experiment, myocardial histopathological observation was performed. Location and distribution of NFκB p50 was examined by immunohistochemical assay. Expression of NFκB p50 protein was examined by immunobolt assay. Electrophoretic Mobility Shift Assay examined activity of NFκB; Myocardium p53 gene expression was examined by RTPCR analysis Results The myocardial lesions of rats were less pronounced in ADR +PDTC group than in ADR group Compared with control group, there were many myocardium nucleuses, which expressed NFκB p50 and distribute under epicardium Expression of NFκB p50 protein in nucleus increased significantly in ADR group The NFκB binding activity increased significantly in ADR group Myocardium expressions of p53 mRNA increased in ADR group Conclusions The NFκB binding activity increased significantly in cardiomyopathy induced by ADR in rats. Moreover, NFκB plays an important role in causing degeneration of myocardial tissue and regulating expression of relatedapoptosis genes展开更多
Reactions of [FeL2(CH3CN)2]2+(L = N-pyrimid-2-ylimidazolylidene) with various N-,P-,O-,and S-donors were investigated.By replacing the labile acetonitrile,various iron-NHC complexes containing additional N-,P-,O-,and ...Reactions of [FeL2(CH3CN)2]2+(L = N-pyrimid-2-ylimidazolylidene) with various N-,P-,O-,and S-donors were investigated.By replacing the labile acetonitrile,various iron-NHC complexes containing additional N-,P-,O-,and S-ligands were prepared.All the iron-NHC complexes were fully characterized by NMR spectroscopy and X-ray crystallography.[FeL2(CH3CN)2]2+ could efficiently catalyze the coupling reactions of various Grignard reagents with heteroaryl bromides or chlorides.展开更多
An ATM ring switching testbed is proposed in this paper. Two practical applications for the ATMring exchange are aimed, one is used ai ATM LAM/MAN, another is for rural local ATM exchange. A dis-tributed swithching an...An ATM ring switching testbed is proposed in this paper. Two practical applications for the ATMring exchange are aimed, one is used ai ATM LAM/MAN, another is for rural local ATM exchange. A dis-tributed swithching and control architecture is designed. together with a modular and flexible hardware and soft-ware structure which permits a rapid and easy introduction and testing of new, services. Hierarchical VP and VCswitching is organized, three AALs (AAL1, AAL4 & AAL5) are supported to provide conaretion-oriented andconnectionless services Broadcasting, multicasting and multi-conferencing functions are achieved at no extra cost,and imerworking with the existing network is emphasized. The constucticon of ring access node is described. As anexample a PDH-ATM interface is given.展开更多
KAM theorem of reversible system is used to provide a sufficient condition which guarantees the stability of a parabolic fixed point of reversible mappings. The main idea is to discuss when the parabolic thed point is...KAM theorem of reversible system is used to provide a sufficient condition which guarantees the stability of a parabolic fixed point of reversible mappings. The main idea is to discuss when the parabolic thed point is surrounded by closed invariant curves and thus exhibits stable behaviour.展开更多
文摘The c-axis charge transport of the hole doped triangular antiferromagnet is investigated within the t-J model by considering the incoherent interlayer hopping. It is shown that the c-axis charge transport of the hole doped triangular antiferromagnet is essentially determined by the scattering from the in-plane fluctuation. The c-axis conductivity spectrum shows a low-energy peak and the unusual high-energy broad band, while the c-axis resistivity is characterized by a crossover from the high temperature metallic-like behavior to the low temperature insulating-like behavior, which is qualitatively consistent with those of the hole doped square lattice antiferromagnet.
文摘Within the charge-spin separation fermion-spin theory, we show that themechanism of superconductivity in the electron doped cobaltate Na_x CoO_2 · gH_2O is ascribed toits kinetic energy. The dressed fermions interact occurring directly through the kinetic energy byexchanging magnetic excitations. This interaction leads to a net attractive force between dressedfermions, then the electron Cooper pairs originating from the dressed fermion pairing state are dueto the charge-spin recombination, and their condensation reveals the superconducting ground state.The superconducting transition temperature is identical to the dressed fermion pair transitiontemperature, and is suppressed to a lower temperature due to the strong magnetic frustration. Theoptimal superconducting transition temperature occurs in the electron doping concentration δ ≈0.29, and then decreases for both underdoped and overdoped regimes, in qualitative agreement withthe experimental results.
基金supported by the National Key Basic Research Development Project(Grant No.G1999064707)by Dazhan Group(Tianjin,China).
文摘An adsorbent with good adsorption perform-ance for binding low density lipoprotein (LDL) was synthe-sized through a simple preparation procedure. The phase-inversion technique was employed to form macropor-ous chitosan beads, which were then simultaneously acti-vated, cross-linked and connected with a long spacer arm via the reaction with ethyleneglycol diglycidylether (EGDE). Tryptophan (Trp) was subsequently coupled to the ep-oxy-activated beads. This adsorbent demonstrated satisfac-tory adsorption capacity and selectivity for LDL, and it also exhibited excellent blood compatibility. The effect of spacer arms with different length on the adsorption selectivity was investigated experimentally, and the mechanism was ana-lyzed.
文摘Background This study aimed at investigating the change and significance of nuclear factorκB (NFκB) in cardiomyopathy induced by adriamycin (ADR) in ratsMethods Sixty male Wistar rats were randomly divided into three groups: control, ADR and ADR+pyrrolidine dithiocarbamate (PDTC) groups After 30day experiment, myocardial histopathological observation was performed. Location and distribution of NFκB p50 was examined by immunohistochemical assay. Expression of NFκB p50 protein was examined by immunobolt assay. Electrophoretic Mobility Shift Assay examined activity of NFκB; Myocardium p53 gene expression was examined by RTPCR analysis Results The myocardial lesions of rats were less pronounced in ADR +PDTC group than in ADR group Compared with control group, there were many myocardium nucleuses, which expressed NFκB p50 and distribute under epicardium Expression of NFκB p50 protein in nucleus increased significantly in ADR group The NFκB binding activity increased significantly in ADR group Myocardium expressions of p53 mRNA increased in ADR group Conclusions The NFκB binding activity increased significantly in cardiomyopathy induced by ADR in rats. Moreover, NFκB plays an important role in causing degeneration of myocardial tissue and regulating expression of relatedapoptosis genes
基金supported by the National Natural Science Foundation of China (21072170)
文摘Reactions of [FeL2(CH3CN)2]2+(L = N-pyrimid-2-ylimidazolylidene) with various N-,P-,O-,and S-donors were investigated.By replacing the labile acetonitrile,various iron-NHC complexes containing additional N-,P-,O-,and S-ligands were prepared.All the iron-NHC complexes were fully characterized by NMR spectroscopy and X-ray crystallography.[FeL2(CH3CN)2]2+ could efficiently catalyze the coupling reactions of various Grignard reagents with heteroaryl bromides or chlorides.
文摘An ATM ring switching testbed is proposed in this paper. Two practical applications for the ATMring exchange are aimed, one is used ai ATM LAM/MAN, another is for rural local ATM exchange. A dis-tributed swithching and control architecture is designed. together with a modular and flexible hardware and soft-ware structure which permits a rapid and easy introduction and testing of new, services. Hierarchical VP and VCswitching is organized, three AALs (AAL1, AAL4 & AAL5) are supported to provide conaretion-oriented andconnectionless services Broadcasting, multicasting and multi-conferencing functions are achieved at no extra cost,and imerworking with the existing network is emphasized. The constucticon of ring access node is described. As anexample a PDH-ATM interface is given.
文摘KAM theorem of reversible system is used to provide a sufficient condition which guarantees the stability of a parabolic fixed point of reversible mappings. The main idea is to discuss when the parabolic thed point is surrounded by closed invariant curves and thus exhibits stable behaviour.
