63,654 research outputs found
q-Differential equations for q-classical polynomials and q-Jacobi-Stirling numbers
Full text linkWe 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
Wang Shuo and the commercialisation of contemporary Chinese culture
Full text linkThis thesis examines the commercialisation of Chinese culture that has taken place over the past twenty years in mainland China. It explores the contribution of Wang Shuo, a cultural figure who straddles different fields of culture, moving from literature to the ultimate mass culture medium of television, this study plots Wang Shuo' s development from educational failure, to business failure, to fiction writer, film & TV editor, film director and cultural critic and analyst. His stories, films, TV series and articles have caused shock-waves throughout national cultural circles as he has transformed the terms of the debate from academic discourse to a validation of the role of the market in the culture field. Although Wang Shuo has not been labelled as a dissident, his approach to the culture market has had a more subversive effect on official ideology that those overt dissidents who have had to live in exile or have been imprisoned. He has utilised the language of official ideology to satirise the authorities, turning the ideology and its supporters into figures of fun. Yet his own goals have been strictly personal and economic ones. The authorities recognize the value of Wang Shuo's work in the cultural market but at the same time distrust his works and place him under strict censorship. Examining the way Wang Shuo and people surround him have succeeded in different fields of cultural achievement is a mirror to understanding the process of the transformation of contemporary Chinese culture from a socialist state-controlled culture to a market-oriented mass culture industry
Oceanogaphical and geological background
No full textThe South China Sea (SCS) embraces an area of about 3.5 x 106 km2 and extends from the Tropic of Cancer to the Equator, across over 20 degrees of latitude in the west Pacific. Since the last decade, the SCS has become the focus in studying the East Asian monsoon, like the Arabian Sea for the Indian monsoon (Wang B. et al. 2003). The SCS offers an ideal locality for high-resolution paleoceanographic researches in the low-latitude western Pacific because its hemipelagic sediments often register higher deposition rates and its carbonate compensation depth (CCD) is generally deeper than neighboring sea basins (Wang P. 1999).Pinxian Wang and Qianyu L
Dynamics Simulation of Remotely Operated Vehicle-Fiber Optic Micro Cable System
Full text linkLi Q, Xu H, Zhang Q, Wang X, Li ZG. Dynamics Simulation of Remotely Operated Vehicle-Fiber Optic Micro Cable System. Presented at the WCICA2008, Chongqing, China
High-Q bismuth silicate nonlinear glass microsphere resonators
Full text linkThe 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
Asian dust storm observed at a rural mountain site in southern China : chemical evolution and heterogeneous photochemistry
No full textAuthor name used in this publication: Nie, W.Author name used in this publication: Wang, T.Author name used in this publication: Xue, L. K.Author name used in this publication: Wang, X. F.Author name used in this publication: Gao, X. M.Author name used in this publication: Zhang, Q. Z.Author name used in this publication: Wang, W. X.2012-2013 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedC
A theoretical model for a piezoelectric energy harvester with a tapered shape
No full textA piezoelectric energy harvester made of a tapered cantilever surface bonded with piezoelectric patches is developed to harness energy from ambient vibrations. Compared with the available cantilever harvester of a uniform shape in the length direction, this harvester has a higher energy harvesting efficiency since a maximum collected power at each piezoelectric patch on the cantilever can be achieved. The current available models for cantilever harvesters are not applicable for the new developed tapered harvester due to the difficulties in dealing with the tapered shape. A corresponding finite differential model is hence developed to model the tapered harvester for estimating its efficiency by examining a governing differential equation with variable coefficients. The influences of some practical considerations, such as the geometry of the tapered cantilever and the width of piezoelectric patches on the root mean square of the generated electric power, are discussed. The results from the developed model show that an electric power up to 70 times higher than the available uniform cantilever harvesters can be achieved by the tapered harvester. This research provides an effective model for evaluating the high efficiency of the piezoelectric coupled tapered cantilevers in energy harvesting
Enhanced Electrochemical H2 Evolution by Few-Layered Metallic WS2(1-x)Se2x Nanoribbons
Full text linkAs an effective alternative to noble platinum electrocatalyst, earth abundant and inexpensive layered transition metal dichalcogenides (TMDs) are investigated for the hydrogen evolution reaction (HER). Compared with binary TMDs, the tunably composed ternary TMDs have hitherto received relatively little attention. Here, few-layered ternary WS2(1-x)Se2x nanoribbons (NRs) with metallic 1T phases, much more catalytically active in HER, are prepared for the first time. The favorable ΔGHo introduced by the tensile region on the surface, along with the presence of local lattice distortions of the WS2(1-x)Se2x nanoribbons with metallic 1T phases, greatly promotes the HER process. These ternary NRs achieve the lowest overpotential of ≈0.17 V at 10 mA cm-2 and a Tafel slope of ≈68 mV dec-1 at a low catalyst loading (≈0.30 ± 0.02 mg cm-2). Notably, the long-term durability suggests the potential of practical applications in acid electrolytes. The results here suggest that the ternary WS2(1-x)Se2x NRs with 1T phases are prominent alternatives to platinum-based HER electrocatalysts. Few-layered ternary WS2(1-x)Se2x nanoribbons (NRs) with metallic 1T phases are prepared. The favorable Gibbs free energy for hydrogen absorption (ΔGHo) of the WS2(1-x)Se2x NRs, introduced by the tensile region and local lattice distortions, greatly promotes the hydrogen evolution reaction (HER). The results suggest that the metallic WS2(1-x)Se2x NRs are potential alternatives for HER electrocatalysts
Discovering Large Isotropic Negative Thermal Expansion in Framework Compound AgB(CN)4 via the Concept of Average Atomic Volume
No full textExploring isotropic negative thermal expansion (NTE) compounds is interesting, but remains challenging. Here, a new concept of "average atomic volume" is proposed to find new NTE open-framework materials. According to this guidance, two NTE compounds, AgB(CN)4 and CuB(CN)4, have been discovered, of which AgB(CN)4 exhibits a large NTE over a wide temperature range (αv =-40 × 10-6 K-1, 100-600 K). The analysis by extended X-ray absorption fine structure spectroscopy and first-principles calculation indicate that (i) the NTE driving force comes from the transverse vibrations of bridge chain atoms of C and N, corresponding to the low-frequency phonon modes; and (ii) the same transverse vibration direction of C and N atoms is a key factor for the occurrence of strong NTE in AgB(CN)4. The present concept of "average atomic volume" can be a simple parameter to explore new NTE compounds especially in those open-framework materials
Holographic Display-Based Control for High-Accuracy Photolithography of Cellular Micro-Scaffold With Heterogeneous Architecture
No full text- …
