72,447 research outputs found
Tour to China, Concert Nanjing, Concert Xi'an; recitals with Ma, L. (cellist), Yin, N. (violinist), Ju, Y. (pianist) Dong, L. (flautist), Ma Li, L. (flautist), Qiao Liang, Q. (flautist) in Nanjing performing Beethoven: Symphony No 1 arr Hummel ( Edition Grodd), Taira:Synchcronie, Bozza: Jour d ete Quartet; Koechlin: Sonata, Hosokawa: Kuroda Bushi Flute and in Xi'an with Dong, L. (flautist),, Gao, Q. (Flautist), Gao, Y. (Flautist), Zhang, K. (Flautist) .
No full textRecitals with Ma, L. (cellist), Yin, N. (violinist), Ju, Y. (pianist) Dong, L. (flautist), Ma Li, L. (flautist), Qiao Liang, Q. (flautist) in Nanjing performing Beethoven: Symphony No 1 arr Hummel ( Edition Grodd), Taira:Synchcronie, Bozza: Jour d ete Quartet; Koechlin: Sonata, Hosokawa: Kuroda Bushi Flute and in Xi'an with Dong, L. (flautist),, Gao, Q. (Flautist), Gao, Y. (Flautist), Zhang, K. (Flautist) .Public concerts including world premier of Beethoven Symphony No 1 arr Hummel Edition Grodd, with Head of Strings Prof Ma and colleagues in Nanjing. In Xi'an performance with Head of Flutes Professor Gao. Repertoire: Beethoven: Symphony No 1 arr Hummel ( Edition Grodd), Taira:Synchcronie, Bozza: Jour d ete Quartet; Koechlin: Sonata, Hosokawa: Kuroda Bushi Flutehttp://www.xacom.edu.cn/info/1055/18653.ht
q-Differential equations for q-classical polynomials and q-Jacobi-Stirling numbers
No full textWe introduce, characterise and provide a combinatorial interpretation for the so-called q-Jacobi–Stirling numbers.
This study is motivated by their key role in the (reciprocal) expansion of any power of a second order
q-differential operator having the q-classical polynomials as eigenfunctions in terms of other even order operators,
which we explicitly construct in this work. The results here obtained can be viewed as the q-version of
those given by Everitt et al. and by the first author, whilst the combinatorics of this new set of numbers is a
q-version of the Jacobi–Stirling numbers given by Gelineau and the second author
High-Q bismuth silicate nonlinear glass microsphere resonators
No full textThe fabrication and characterization of a bismuth-silicate glass microsphere resonator has been demonstrated. At wavelengths near 1550 nm, high-modes can be efficiently excited in a 179 µm diameter bismuth-silicate glass microsphere via evanescent coupling using a tapered silica fiber with a waist diameter of circa 2 µm. Resonances with Q-factors as high as were observed. The dependence of the spectral response on variations in the input power level was studied in detail to gain an insight into power-dependent thermal resonance shifts. Because of their high nonlinearity and high- factors, bismuth-silicate glass microspheres offer the potential for robustly assembled fully integrated all-optical switching devices
Polysulfide-mediated solvation shell reorganization for fast Li+ transfer probed by in-situ sum frequency generation spectroscopy
No full textUnderstanding of interfacial Li+ solvation shell structures and dynamic evolution at the electrode/electrolyte interface is requisite for developing high-energy-density Li batteries. Herein, the reorganization of Li+ solvation shell at the sulfur/electrolyte interface along with the presence of a trace amount of lithium polysulfides is verified by in-situ sum frequency generation (SFG) spectroscopy together with density functional theory (DFT) calculations. Both the spectroelectrochemical and DFT calculation results reveal a strongly competitive anion adsorption of the polysulfide anion additive against the pristine electrolyte anion on the sulfur cathode surface, reorganizing the interfacial local solvation shell structure facilitating rapid Li ion transfer and conduction. Meanwhile, the evolution of the SFG signals along with the discharging/charging cycle exhibits improved reversibility, indicating the transformation of the inner Helmholtz plane layer into a stable molecular-layer polysulfide interphase rather than a dynamic diffusion layer. Consequently, applications in practical Li-S batteries reveal the capacity and cycling stability of the corresponding cells are significantly enhanced. Our work provides a methodology using in-situ SFG for probing solvation reorganization of charge carriers at electrochemical interfaces
Interfacial “Single-Atom-in-Defects” Catalysts Accelerating Li+ Desolvation Kinetics for Long-Lifespan Lithium-Metal Batteries
No full textThe lithium-metal anode is a promising candidate for realizing high-energy-density batteries owing to its high capacity and low potential. However, several rate-limiting kinetic obstacles, such as the desolvation of Li+ solvation structure to liberate Li+, Li0 nucleation, and atom diffusion, cause heterogeneous spatial Li-ion distribution and fractal plating morphology with dendrite formation, leading to low Coulombic efficiency and depressive electrochemical stability. Herein, differing from pore sieving effect or electrolyte engineering, atomic iron anchors to cation vacancy-rich Co1−xS embedded in 3D porous carbon (SAFe/CVRCS@3DPC) is proposed and demonstrated as catalytic kinetic promoters. Numerous free Li ions are electrocatalytically dissociated from the Li+ solvation complex structure for uniform lateral diffusion by reducing desolvation and diffusion barriers via SAFe/CVRCS@3DPC, realizing smooth dendrite-free Li morphologies, as comprehensively understood by combined in situ/ex situ characterizations. Encouraged by SAFe/CVRCS@3DPC catalytic promotor, the modified Li-metal anodes achieve smooth plating with a long lifespan (1600 h) and high Coulombic efficiency without any dendrite formation. Paired with the LiFePO4 cathode, the full cell (10.7 mg cm−2) stabilizes a capacity retention of 90.3% after 300 cycles at 0.5 C, signifying the feasibility of using interfacial catalysts for modulating Li behaviors toward practical applications
Constraint analysis of thickness effects on fracture resistance behavior of clamped single-edge notch tension specimen
No full textThe correlation between the out-of-plane stress and the in-plane stress is established based on the bending modified J-Q theory and the out-of-plane constraint parameter TZ. Accordingly, an improved J-QZ-M constraint theory is developed to characterize the crack-tip fields by taking into account opening- and bending-dominated deformations in the ligament of the clamped single edge notch tension (SE(T)) specimens. Three-dimensional elastic-plastic finite element analyses (FEA) with a wide range of in-plane and out-of-plane constraints are performed to validate the proposed approach. It is found that the proposed J-QZ-M constraint theory can effectively quantify the crack-tip fields of SE(T) specimens, and the constraint parameter QZ exhibits approximately load- and distance-independence until large scale yielding (LSY)
Experimental and Numerical data for the manuscript “Observation of giant circular dichroism induced by electronic chirality in TiSe2” by Q. Xiao, O. Janson, S. Francoual, Q. Qiu, Q. Li, S. Zhang, W. Xie, P. Bereciartua, J. van den Brink, J. van Wezel, and Y. Peng
No full textThis repository contains experimental and numerical data for the manuscript "Observation of giant circular dichroism induced by electronic chirality in TiSe2'' by Q. Xiao, O. Janson, S. Francoual, Q. Qiu, Q. Li, S. Zhang, W. Xie, P. Bereciartua, J. van den Brink, J. van Wezel, and Y. Peng
On the evaluation of output voltages for quantifying the performance of pyroelectric energy harvesters
No full textPyroelectric energy harvesters (PyEHs) have been extensively developed for the energy supply to wireless, low-power advanced devices. Plenty of experiments show that the voltage–time curves for evaluating pyroelectric devices are alternatively positive and negative, while the fundamental pyroelectric theory gives a positive voltage without the negative portion. Here, this key confliction is addressed by both theoretical and experimental investigation. The voltage-time curves are recorded by three voltmeters with inner resistances of 10 MΩ, 150 GΩ, and 200 TΩ, respectively. Measured output voltages are found to be influenced greatly by the voltmeter's resistance and capacitance, with peak voltages differing by a factor that exceeds 2200. The performance of the PyEH should be characterized by the intrinsic voltage rather than the open-circuit voltage. As a significant conclusion, the resistance and capacitance of voltmeters used should be reported in the literature, thus providing a rationale for comparing the performance of different devices
Sm-Nd, Rb-Sr and 40Ar-39Ar Isotopic Systematics of the Ultrahigh Pressure Metamorphic Rocks in the Dabie-Sulu Belt, Central China: A Retrospective View.
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