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Dr. Yao Xiao Yan-Fang Zhu Dr. Wei Xiang Dr. Zhen-Guo Wu Yong-Chun Li Jing Lai Shi Li Dr. Enhui Wang Zu-Guang Yang Chun-Liu Xu Prof. Ben-He Zhong Prof. Xiao-Dong Guo 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(4):1507-1511
Demands for large-scale energy storage systems have driven the development of layered transition-metal oxide cathodes for room-temperature rechargeable sodium ion batteries (SIBs). Now, an abnormal layered-tunnel heterostructure Na0.44Co0.1Mn0.9O2 cathode material induced by chemical element substitution is reported. By virtue of beneficial synergistic effects, this layered-tunnel electrode shows outstanding electrochemical performance in sodium half-cell system and excellent compatibility with hard carbon anode in sodium full-cell system. The underlying formation process, charge compensation mechanism, phase transition, and sodium-ion storage electrochemistry are clearly articulated and confirmed through combined analyses of in situ high-energy X-ray diffraction and ex situ X-ray absorption spectroscopy as well as operando X-ray diffraction. This crystal structure engineering regulation strategy offers a future outlook into advanced cathode materials for SIBs. 相似文献
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Yao Xiao Yan‐Fang Zhu Wei Xiang Zhen‐Guo Wu Yong‐Chun Li Jing Lai Shi Li Enhui Wang Zu‐Guang Yang Chun‐Liu Xu Ben‐He Zhong Xiao‐Dong Guo 《Angewandte Chemie (International ed. in English)》2020,59(4):1491-1495
Demands for large‐scale energy storage systems have driven the development of layered transition‐metal oxide cathodes for room‐temperature rechargeable sodium ion batteries (SIBs). Now, an abnormal layered‐tunnel heterostructure Na0.44Co0.1Mn0.9O2 cathode material induced by chemical element substitution is reported. By virtue of beneficial synergistic effects, this layered‐tunnel electrode shows outstanding electrochemical performance in sodium half‐cell system and excellent compatibility with hard carbon anode in sodium full‐cell system. The underlying formation process, charge compensation mechanism, phase transition, and sodium‐ion storage electrochemistry are clearly articulated and confirmed through combined analyses of in situ high‐energy X‐ray diffraction and ex situ X‐ray absorption spectroscopy as well as operando X‐ray diffraction. This crystal structure engineering regulation strategy offers a future outlook into advanced cathode materials for SIBs. 相似文献
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Isoproterenol (ISO) is a synthetic catecholamine with a powerful cardiac stimulate, bronchial smooth and skeletal muscle relaxation, coronary artery and peripheral vasodilator effects. In this study, a simple, rapid, and selective liquid chromatography–tandem mass spectrometry has been developed for the determination of ISO in rat plasma. Proteins were precipitated in plasma samples with 0.1?g?mL?1 trichloroacetic acid and the ISO/internal standard (IS) were separated on a C8 column. The ISO was detected by a triple-quadrupole mass spectrometer with electrospray ionization source. The transitions of m/z 212.1?→?193.9 for ISO and m/z 285.2?→?193.2 for IS were conducted through multiple reaction monitoring mode. This method was linear over the range of 2–500?n?g?mL?1. The intra- and inter-day assay precision were observed between 3 and 10%. The accuracy was within ±11%. Stability study results demonstrated that ISO was stable in the autosampler at 4°C for 24?hr, and for 8?hr at room temperature. Only one freeze–thaw cycle at ?80°C for 24?hr was found to be stable. The validated method was successfully applied to a pharmacokinetic study of ISO in rats following subcutaneous administration. 相似文献
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§ 1 IntroductionThispaperisthesequelto[1 ,2 ].Cairnsetal.[1] introducedthenotionofachaoticgroupactionasageneralizationofchaoticdynamicalsystems(seedefinitionbelow) .Theyshowedthatthecircledoesnotadmitachaoticactionofanygroup ,andconstructedachaoticactionofG =Z×… 相似文献
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The goal of this paper is to study ergodic and rigidity properties of smooth actions of the discrete Heisenberg group \(\mathcal{H}\). We establish the decomposition of the tangent space of any C∞ compact Riemannian manifold M for Lyapunov exponents, and show that all Lyapunov exponents for the central elements are zero. We obtain that if an \(\mathcal{H}\) action contains an Anosov element, then under certain conditions on the eigenvalues of this element, the action of each central element is of finite order. In particular, there is no faithful codimension one Anosov Heisenberg group action on any compact manifold, and there is no faithful codimension two Anosov Heisenberg group action on tori. In addition, we show smooth local rigidity for higher rank ergodic \(\mathcal{H}\) actions by toral automorphisms, using a generalization of the KAM (Kolmogorov–Arnold–Moser) iterative scheme. 相似文献
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It is shown that every continuous action of a solvable group on a 1-arcwise connected continuum must have a fixed point or have a 2-periodic point. 相似文献
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Dye-sensitized phototransformation of chlorophenols and their subsequent chemiluminescence reactions
A novel chemiluminescence (CL) reaction of chlorophenols (CPs), including 2-chlorophenol (2-CP), 4-CP, 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP) was reported, which was based on the oxidation of the phototransformed CPs by N-bromosuccinimide (NBS). It was found that the dye-sensitized phototransformation is a prerequisite for the subsequent CL reaction, and the presence of 1.9×10-2 mol L−1 Triton X-100 or 3.7×10-3 mol L−1 CTAB can greatly enhance the CL intensity. A neutral sample solution with the presence of 2×10-5 mol L−1 fluorescein (FL) was found to be optimum for the phototransformation of 2-CP, 4-CP, 2,4-DCP and PCP, but a lower pH of 5.3 was more suitable for 2,4,6-TCP. Based on the CL reaction, detection limits of 8.6×10−8, 1.1×10−7, 1.5×10-7, 4.6×10-8 and 3.0×10−5 mol L−1 were achieved, respectively, for 2-CP, 4-CP, 2,4-DCP, 2,4,6-TCP and PCP with the optimized conditions in the flow system. The mechanism of the phototransformation and the subsequent CL reaction were preliminarily studied and it was suggested that the singlet oxygen formed in the dye-sensitization process was responsible for the conversion of CPs into light-emitting precursors. These intermediate products were suggested to be peroxide compounds after testing by a luminal-based post-column CL detection experiment. 相似文献
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We prove that each linear action of on an infinite-dimensional Banach space generated by compact operators cannot be hypercyclic. This result generalizes a theorem of Kitai for the case of Z+ actions. Contrary to the case of infinite dimension, a hypercyclic action of on C is given. 相似文献