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Frontiers of Chemical Science and engineering 2021年第3期15卷 518-527页

作者： Yixin Zhang Lu Zhou Liqing Chen Yang Guo Fanhui Guo Jianjun Wu Baiqian Dai National engineering Research center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical engineering and technology China University of Mining and TechnologyXuzhou 221116China School of Chemistry Monash UniversityVictoria 3800Australia department of Chemical engineering Monash UniversityVictoria 3800Australia

The coal fly ash produced by gasification is estimated to be over 80 million ton per year in China by *** has mainly been disposed as solid waste by *** is lack of study focused on its *** this paper,the coal fly ash produced by gasification was at first analyzed and then applied to synthesize zeolite as an *** effects of synthesis conditions on the cation exchange capacity(CEC)of zeolite were *** results from X-ray diffraction and scanning electron microscope indicated that the crystallinity of the synthesized zeolite is the most important factor to affect the *** the synthesized zeolite with the highest CEC(275.5 meq/100 g)was used for the adsorption of Cr(Ⅵ) from aqueous solution,the maximum adsorption capacity for Cr(Ⅵ) was found to be 17.924 mg/*** effects of pH,contact time and initial concentration on the adsorption of Cr(Ⅵ) were also *** adsorption kinetics and isotherms can be well described by the pseudo-secondorder model and Langmuir isotherm model,respectively.

关键词： coal fly ash gasification zeolite Na-P1 chromium(Ⅵ)

An error-free protocol for quantum entanglement distribution in long-distance quantum communication

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Chinese Science Bulletin 2011年第7期56卷 618-625页

作者： SALEMIAN Shamsolah MOHAMMADNEJAD Shahram Nanoptronics Research center Department of Electronics and Electrical Engineering Iran University of Science and Technology

Quantum entanglement distribution is an essential part of quantum communication and computation protocols. Here, linear optic elements are employed for the distribution of quantum entanglement over a long distance. Polarization beam splitters and wave plates are used to realize an error-free protocol for broadcasting quantum entanglement in optical quantum communication. This protocol can determine the maximum distance of quantum communication without decoherence. Error detection and error correc-tion are performed in the proposed scheme. In other words, if there is a bit flip along the quantum channel, the end stations (Alice and Bob) can detect this state change and obtain the correct state (entangled photon) at another port. Existing general error detec-tion protocols are based on the quantum controlled-NOT (CNOT) or similar quantum logic operations, which are very difficult to implement experimentally. Here we present a feasible scheme for the implementation of entanglement distribution based on a linear optics element that does not need a quantum CNOT gate.

关键词：光量子通信量子纠缠协议长距离分发错误检测量子逻辑运算光学元件

Metallic phase W_(0.9)Mo_(0.1)S_(2)for high-performance anode of sodium ion batteries through suppressing the dissolution of polysulfides

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Journal of Energy Chemistry 2022年第3期31卷 356-365,I0010页

作者： Huachao Tao Jing Li Jinhang Li Zhenhua Hou Xuelin Yang Li-Zhen Fan College of electrical engineering&New Energy Hubei Provincial Collaborative Innovation Center for New Energy MicrogridChina Three Gorges UniversityYichang 443002HubeiChina Beijing advanced Innovation center for Materials Genome engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

WS_(2)with layered graphite-like structure as anode for sodium ion batteries has high specific ***,the poor cycling performance and rate capability of WS_(2)caused by the low electronic conductivity and structure changes during cycles inhibit its practical ***,metallic phase(1T)W_(x)Mo_(1−x)S2(x=1,0.9,0.8 and 0.6)with high electronic conductivity and expanded interlayer spacing of 0.95 nm was directly prepared via a simple hydrothermal ***,1T W_(0.9)Mo_(0.1)S_(2)as anode for sodium ion batteries displays high capacities of 411 mAh g^(-1)at 0.1 A g^(-1)after 180 cycles and 262 mAh g^(-1)at 1 A g^(-1)after 280 cycles and excellent rate capability(245 mAh g^(-1)at 5 A g^(-1)).The full cell based on Na_(3)V_(2)(PO_(4))_(2)O_(2)F/C cathode and 1T W_(0.9)Mo_(0.1)S_(2)anode also exhibits high capacity and good cycling *** irreversible electrochemical reaction of 1T W_(0.9)Mo_(0.1)S_(2)with Na ions during first few cycles results in the main products of W-Mo alloy and *** strong adsorption of W-Mo alloy with polysulfides can effectively suppress the dissolution and shuttle effect of polysulfides,which ensures the excellent cycling performance of 1T W_(0.9)Mo_(0.1)S_(2).

关键词： Sodium ion batteries Anode 1T W_(0.9)Mo_(0.1)S_(2) Irreversible conversion reaction Polysulfides

Surface discharge imaging in presence of deposited space charges in non-uniform DC electric field

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High Voltage 2021年第4期6卷 576-589页

作者： Marek Florkowski Dariusz Krześniak Maciej Kuniewski PawełZydroń department of electrical and Power engineering AGH University of Science and TechnologyKrakowPoland ABB Corporate technology center KrakowPoland

An investigation is made of the influence of an accumulated charge sprinkled on the surface of an epoxy resin plate in corona mode on partial discharge inception and its forms as analyzed by optical imaging at DC *** effects of the polarities of both the deposited hetero-and homocharges were *** occurrence of first streamer discharges was detected electrically and observed by optical *** various forms of streamers were acquired by optical imaging and associated with the polarity and intensity of the accumulated surface *** charge sprinkling on the epoxy specimen surface was quantitatively evaluated by surface charge *** addition,the effect of the subsequent discharges occurring in a heterocharge configu-ration above the inception voltage was *** terms of their directions and lengths,the kinetics of the streamer filaments revealed a strong dependence on both the polarity and the intensity of an accumulated *** with the reference charge-free surface,the strongest drop in dielectric strength in the interelectrode space with a sprinkled charge was obtained for the heterocharge *** presented results provide a contribution to the assessment of streamer behaviour in the presence of accumulated surface charges,including its polarity and intensity.

关键词： deposited Surface charges

advanced operation of heated fluidic resonators via mechanical and thermal loss reduction in vacuum

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Microsystems & Nanoengineering 2023年第5期9卷 255-262页

作者： Juhee Ko Bong Jae Lee Jungchul Lee department of Mechanical engineering Center for Extreme Thermal Physics and ManufacturingKorea Advanced Institute of Science and Technology(KAIST)34141 DaejeonKorea

For simultaneous and quantitative thermophysical measurements of ultrasmall liquid volumes,we have recently developed and reported heated fluidic resonators(HFRs).In this paper,we improve the precision of HFRs in a vacuum by significantly reducing the thermal loss around the sensing element.A vacuum chamber with optical,electrical,and microfluidic access is custom-built to decrease the convection loss by two orders of magnitude under 10-4 mbar *** a result,the measurement sensitivities for thermal conductivity and specific heat capacity are increased by 4.1 and 1.6 times,*** differentiating between deionized water(H2O)and heavy water(D2O)with similar thermophysical properties and~10%different mass densities,the signal-to-noise ratio(property differences over standard error)for H2O and D2O is increased by 9 and 5 times for thermal conductivity and specific heat capacity,respectively.

关键词： fluid operation vacuum

Numerical modelling of spatially and temporally distributed on‑fault induced seismicity:implication for seismic hazards

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International Journal of Coal Science & technology 2023年第1期10卷 108-123页

作者： Atsushi Sainoki Adam Karl Schwartzkopf Lishuai Jiang Hani Mitri Faculty of advanced Science and technology KumamotoUniversityKumamotoJapan School of engineering The University of Western AustraliaPerthAustralia State Key Laboratory of mining Disaster Preventionand Control Shandong University of Scienceand TechnologyShandongChina department of mining and Materials engineering McGillUniversityMontrealCanada

Induced seismicity is strongly related to various engineering projects that cause anthropogenic in-situ stress change at a great ***,there is a need to estimate and mitigate the associated *** the past,various simulation methods have been developed and applied to induced seismicity analysis,but there is still a fundamental diference between simulation results and feld observations in terms of the spatial distribution of seismic events and its *** present study aims to develop a method to simulate spatially distributed on-fault seismicity whilst reproducing a complex stress state in the fault ***,an equivalent continuum model is constructed,based on a discrete fracture network within a fault damage zone,by employing the crack tensor theory.A fault core is simulated at the center of the model as a discontinuous *** the model,a heterogeneous stress state with stress anomalies in the fault zone is frst simulated by applying tractions on the model outer ***,the efective normal stress on the fault plane is decreased in a stepwise manner to induce *** simulation result is validated in terms of the b-value and other seismic source parameters,hence demonstrating that the model can reproduce spatially and temporally distributed on-fault *** analysis on the parameters shows the variation of frequency-magnitude distribution before the occurrence of large seismic *** variation is found to be consistent with feld observations,thus suggesting the potential use of this simulation method in evaluating the risk for seismic hazards in various engineering projects.

关键词： Induced seismicity Fracture network Fault damage zone Crack tensor theory

Improvement in the electrical performance and bias-stress stability of dual-active-layered silicon zinc oxide/zinc oxide thin-film transistor

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Chinese Physics B 2016年第8期25卷 452-457页

作者：刘玉荣赵高位黎沛涛姚若河 The School of Electronic and Information engineering South China University of Technology National engineering technology Research center for Mobile Ultrasonic Detection South China University of Technology department of electrical and Electronic engineering the University of Hong Kong

Si-doped zinc oxide（SZO） thin films are deposited by using a co-sputtering method,and used as the channel active layers of ZnO-based TFTs with single and dual active layer *** effects of silicon content on the optical transmittance of the SZO thin film and electrical properties of the SZO TFT are ***,the electrical performances and bias-stress stabilities of the single- and dual-active-layer TFTs are investigated and compared to reveal the effects of the Si doping and dual-active-layer *** average transmittances of all the SZO films are about 90% in the visible light region of 400 nm-800 nm,and the optical band gap of the SZO film gradually increases with increasing Si *** Si-doping can effectively suppress the grain growth of ZnO,revealed by atomic force microscope *** with that of the undoped ZnO TFT,the off-state current of the SZO TFT is reduced by more than two orders of magnitude and it is 1.5 × 10^-12 A,and thus the on/off current ratio is increased by more than two orders of *** summary,the SZO/ZnO TFT with dual-active-layer structure exhibits a high on/off current ratio of 4.0 × 10^6 and superior stability under gate-bias and drain-bias stress.

关键词： thin film transistor (TFT) silicon-doped zinc oxide dual-active-layer structure bias-stress stability

Semi-polar GaN LEDs on Si substrate

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Science China(Technological Sciences) 2011年第1期54卷 38-41页

作者： Nobuhiko SAWAKI Yoshio HONDA department of electrical and Electronic engineering Aichi Institute of Technology department of Electronics and Akasaki Research center Nagoya University

Growth of semi-polar （1-101）GaN has been attempted on a patterned （001） silicon substrate adopting selective area MOVPE. The growth was initiated on （111） facets of the Si, which had been prepared by anisotropy etching in a KOH solution. A uni- form semi-polar layer was achieved by coalescence of stripes. Since the growth was performed on facets, the surface was atomically fiat in AFM surface analyses. By using a high temperature grown A1N nucleation layer, we achieved low threading dislocation density at the top most surface. Moreover, by tilting the c-axis of the GaN on the Si substrate, the effect of the thermal expansion coefficient mismatch was much reduced. As the result, we achieved a crack free （1-101）GaN template on （001）Si. On the thus prepared （1-101）GaN, a GalnN/GaN LED was fabricated, which showed excellent performance with weak quantum confined Stark effect.

关键词： GaN selective epitaxy semi-polar GaN MOVPE LED

Enhanced AC Fault Ride-through Control for MMC-integrated System Based on Active PCC Voltage Drop

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Journal of Modern Power Systems and Clean Energy 2023年第4期11卷 1316-1330页

作者： Haihan Ye Wu Chen Heng Wu Wu Cao Guoqing He Guanghui Li center for advanced Power Conversion technology and Equipment School of Electrical EngineeringSoutheast UniversityNanjing 210096China department of Energy technology Aalborg University9220 AalborgDenmark China Electric Power Research Institute Beijing 100192China

When a renewable energy station(RES)connects to the rectifier station(RS)of a modular multilevel converterbased high-voltage direct current(MMC-HVDC)system,the voltage at the point of common coupling(PCC)is determined by RS control *** example,RS control may become saturated under fault,and causes the RS to change from an equivalent voltage source to an equivalent current source,making fault analysis more *** addition,the grid code of the fault ride-through(FRT)requires the RES to output current according to its terminal *** changes the fault point voltage and leads to RES voltage regulation and current redistribution,resulting in fault response *** address these issues,this study describes how an MMC-integrated system has five operation modes and three common characteristics under the duration of the *** study also reveals several instances of RS performance degradation such as AC voltage loop saturation,and shows that RS power reversal can be significantly *** enhanced AC FRT control method is proposed to achieve controllable PCC voltage and continuous power transmission by actively reducing the PCC voltage *** robustness of the method is theoretically proven under parameter variation and operation mode ***,the feasibility of the proposed method is verified through MATLAB/Simulink results.

关键词： Modular multilevel converter-based high-voltage direct current(MMC-HVDC)system fault ride-through(FRT) voltage loop saturation continuous power transmission point of common coupling(PCC) active voltage drop control

Single-atomic Pt sites anchored on defective TiO2 nanosheets as a superior photocatalyst for hydrogen evolution

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Journal of Energy Chemistry 2021年第11期62卷 1-10页

作者： Xiaolong Hu Junying Song Jingli Luo Hao Zhang Zhiming Sun Chunquan Li Shuilin Zheng Qingxia Liu School of Chemical and Environmental engineering China University of Mining & Technology (Beijing) department of Chemical and Materials engineering University of Alberta

Single-atomic site catalysts have drawn considerable attention because of their maximum atomutilization efficiency and excellent catalytic *** this work,a highly active single-atomic Pt site photocatalyst was synthesized through employing defective TiO2nanosheets as solid support for photocatalytic water *** indicated that the surface oxygen vacancies on defective TiO2nanosheets could effectively stabilize the single-atomic Pt sites through constructing a three-center Ti–Pt–Ti *** Ti–Pt–Ti structure can hold the stability of isolated single-atomic Pt sites and facilitate the separation and transfer of photoinduced charge carriers,thereby greatly improving the photocatalytic ***,our synthesized photocatalyst exhibited a remarkably enhanced H2evolution performance,and the H2production rate is up to 13460.7 lmol·h-1·g-1,which is up to around 29.0 and 4.7times higher than those of TiO2nanosheets and Pt *** addition,a plausible enhanced reaction mechanism was also proposed combining with photo-electrochemical characterizations and density functional theory (DFT) calculation ***,it is believed that this work highlights the benefits of a single-site catalyst and paves the way to rationally design the highly active and stable single-atomic site photocatalysts on metal oxide support.

关键词： Single atomic site Pt H2 evolution Defect Oxygen vacancies TiO2 nanosheets