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Advancements in heterojunction,cocatalyst,defect and morphology engineering of semiconductor oxide photocatalysts

Journal of Materiomics 2024年第2期10卷 315-338页

作者： guojing wang Shasha Lv Yuanhua Shen Wei Li Linhan Lin Zhengcao Li State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Key Laboratory of Beam Technology and Material Modification Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing100875China School of Physical Science and Technology Lanzhou UniversityLanzhou730000China Department of Engineering Physics Tsinghua UniversityBeijing100084China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing100084China

Photocatalytic technology has emerged as a crucial avenue for harnessing solar energy,presenting itself as a viable solution to address the current energy crisis and environmental *** past 50 years have witnessed significant progress and breakthroughs in scientific research on photocatalytic *** paper provides a comprehensive review of the mechanism of photocatalytic technology and methods to improve the photocatalytic efficiency of semiconductor photocatalysts,such as TiO 2 and *** this paper,common modification methods are divided into four categories:heterojunction con-struction,cocatalysts,defects,and morphological *** origin and development of photo-catalysts in each category are briefly summarized;moreover,the latest progress in each type of modification is discussed.S-scheme heterojunctions retain the high reduction and oxidation capacity of photogenerated electrons and holes by sacrificing half of the photogenerated carriers,showing excellent performance in photocatalysis and great application *** challenges associated with current modification schemes are *** is growing interest in quantitative and atomic-level modu-lation as attractive approaches to tackling these *** the electronic spin state and internal field is important for minimizing photogenerated carrier recombination in *** review will inspire researchers and promote the application of photocatalytic technology.

关键词： Photocatalytic activity Modification Heterostructure Thermal annealing Ion irradiation

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Pricing Catastrophe Options with Credit Risk in a Regime-Switching Model

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应用概率统计 2024年第4期40卷 572-587页

作者： XU Yajuan wang guojing Department of Mathematics and Physics Suzhou Vocational UniversitySuzhou215104China The Center for Financial Engineering and Department of Mathematics Soochow UniversitySuzhou215006China

In this paper,we consider the price of catastrophe options with credit risk in a regime-switching *** assume that the macroeconomic states are described by a continuous-time Markov chain with a finite state *** using the measure change technique,we derive the price expressions of catastrophe put ***,we conduct some numerical analysis to demonstrate how the parameters of the model affect the price of the catastrophe put option.

关键词： pricing catastrophe option credit risk regime-switching measure change

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睡眠期间肠鸣音信号的鼾声噪声去除方法

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生物医学工程学杂志 2024年第2期41卷 288-294页

作者：王国静王卫东刘洪运北京航空航天大学生物与医学工程学院北京100191 中国人民解放军总医院医学创新研究部北京100853 中国人民解放军总医院工业和信息化部生物医学工程与转化医学重点实验室北京100853

肠鸣音监测是评估睡眠期间肠动力的重要方法,但会受到鼾声噪声的严重影响。本文将自适应噪声的完备集合经验模态分解(CEEMDAN)方法用于睡眠期间肠鸣音的鼾声噪声去除。具体地,先对带噪肠鸣音进行带通滤波,然后使用CEEMDAN方法分解,最后... 详细信息

肠鸣音监测是评估睡眠期间肠动力的重要方法,但会受到鼾声噪声的严重影响。本文将自适应噪声的完备集合经验模态分解(CEEMDAN)方法用于睡眠期间肠鸣音的鼾声噪声去除。具体地,先对带噪肠鸣音进行带通滤波,然后使用CEEMDAN方法分解,最后选择适当的分量重构纯净肠鸣音。半模拟数据和真实数据验证表明,与普通的经验模式分解和小波去噪方法相比,CEEMDAN方法能更有效地去除鼾声噪声。CEEMDAN方法用于睡眠期间肠鸣音鼾声噪声去除,可为肠鸣音用于睡眠期间肠动力评估奠定重要基础。

关键词：肠鸣音鼾声自适应噪声的完备集合经验模态分解去噪

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氧空位控制BiVO_(4)晶面异质结的磁性和光电催化性能

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化学学报 2024年第4期82卷 409-415页

作者：王国景陈永辉张秀芹张俊笙徐俊敏王静兰州大学材料与能源学院兰州730000 中国矿业大学材料与物理学院徐州221116 郑州大学物理学院教育部集成电路设计与应用国际合作联合实验室郑州450001

在铁磁光催化剂中,大多数光生电荷具有相同的自旋状态,因此可以有效抑制光生电子和空穴的复合.利用BiVO_(4){010}和{110}晶面中氧空位的形成能不同,通过晶面取向和氧空位的协同作用来调控BiVO_(4)的铁磁性能.在N_(2)气氛中退火后,BiVO_... 详细信息

在铁磁光催化剂中,大多数光生电荷具有相同的自旋状态,因此可以有效抑制光生电子和空穴的复合.利用BiVO_(4){010}和{110}晶面中氧空位的形成能不同,通过晶面取向和氧空位的协同作用来调控BiVO_(4)的铁磁性能.在N_(2)气氛中退火后,BiVO_(4)晶面异质结中氧空位的比例随着{010}/{110}晶面比例的增加而降低,因为{010}晶面上氧空位的形成能低于{110}晶面.{010}/{110}晶面比例较低的BiVO_(4)晶面异质结的铁磁性能优于{010}/{110}晶面比例较高的BiVO_(4),因为前者颗粒尺寸更小、更立体,其比表面积和界面区域更大,所以其表面未饱和自旋对总磁矩的贡献更大.{010}/{110}比例较高的BiVO_(4)晶面异质结具有更大的光电流密度和光电催化产氢效率,源于BiVO_(4){010}晶面比{110}晶面具有更高的电荷迁移率、更好的吸附特性和更低的能垒.并且氧空位的引入也提高了BiVO_(4)的制氢效率.

关键词：铁磁光催化剂氧空位 BiVO_(4)晶面异质结产氢

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A reduced-form model with default intensities containing contagion and regime-switching Vasicek processes

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Frontiers of Mathematics in China 2018年第3期13卷 535-554页

作者： Jie GUO guojing wang Center for Financial Engineering and Department of Mathematics Soochow University Suzhou 215006 China Jiangsu Key Laboratory of Financial Engineering Nanjing Audit University Nanjing 211815 China

The contagion credit risk model is used to describe the contagion effect among different financial institutions. Under such a model, the default intensities are driven not only by the common risk factors, but also by the defaults of other considered firms. In this paper, we consider a two-dimensional credit risk model with contagion and regime-switching. We assume that the default intensity of one firm will jump when the other firm defaults and that the intensity is controlled by a Vasicek model with the coefficients allowed to switch in different regimes before the default of other firm. By changing measure, we derive the marginal distributions and the joint distribution for default times. We obtain some closed form results for pricing the fair spreads of the first and the second to default credit default swaps （CDSs）. Numerical results are presented to show the impacts of the model parameters on the fair spreads.

关键词： Contagion credit default swap (CDS) regime-switching default intensity Vasicek model

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单通道/少通道脑电信号生理伪迹处理方法

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中国医疗器械杂志 2024年第3期48卷 298-305页

作者：王国静刘洪运王卫东康红艳北京航空航天大学生物与医学工程学院北京市100191 中国人民解放军总医院医学创新研究部北京市100853

脑电图是一种非侵入式的脑电活动测量方式,近年来单通道/少通道的脑电应用越来越多,而多种类型的生理伪迹信号严重影响单通道/少通道脑电的分析和广泛应用。该文针对单通道/少通道脑电中存在的多种生理伪迹,综述了涉及的回归和滤波方法... 详细信息

脑电图是一种非侵入式的脑电活动测量方式,近年来单通道/少通道的脑电应用越来越多,而多种类型的生理伪迹信号严重影响单通道/少通道脑电的分析和广泛应用。该文针对单通道/少通道脑电中存在的多种生理伪迹,综述了涉及的回归和滤波方法、分解方法、盲源分离方法和机器学习方法。针对单通道/少通道脑电信号的特点,分析总结了用于不同场景的脑电生理伪迹去除的混合方法,主要包括单伪迹/多伪迹场景和在线/离线场景。另外,该文还回顾了在半模拟和真实脑电数据下的验证算法性能的方法和指标。最后,简述了单通道/少通道脑电应用及生理伪迹处理的发展趋势。

关键词：单通道/少通道脑电伪迹混合方法机器学习

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A contagion model with Markov regime-switching intensities

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Frontiers of Mathematics in China 2014年第1期9卷 45-62页

作者： Yinghui DONG guojing wang Financial Engineering Research Center Shanghai Jiao Tong University Shanghai 200052China Department of Mathematics and Physics Suzhou University of Science and TechnologySuzhou 215011 China Department of Mathematics and Center for Financial Engineering Soochow UniversitySuzhou 215006 China

We consider a two-dimensional reduced form contagion model with regime-switching interacting default intensities. The model assumes the intensities of the default times are driven by macro-economy described by a homogeneous Markov chain as well as the other default. By using the idea of ＇change of measure＇ and some closed-form formulas for the Laplace transforms of the integrated intensity processes, we derive the two-dimensional conditional and unconditional joint distributions of the default times. Based on these results, we give the explicit formulas for the fair spreads of the first-to-default and second-to-default credit default swaps （CDSs） on two underlyings.

关键词： Credit default swap (CDS) contagion model regime-switching change of measure

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多导睡眠监测设备和肠鸣音设备之间数据同步采集方法研究

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中国医疗设备 2024年第5期39卷 9-14页

作者：王国静王卫东中国人民解放军总医院医学创新研究部北京100853 生物医学工程与转化医学工业和信息化部重点实验室北京100853

目的提出一种基于敲击脉冲信号的两个独立设备数据同步采集的方法,以实现数据的同步采集。方法利用多导睡眠监测设备的鼾声传感器与肠鸣音设备相互敲击产生瞬态脉冲信号作为同步标记信号,基于同步标记信号的三阶累积量实现同步标记信号... 详细信息

目的提出一种基于敲击脉冲信号的两个独立设备数据同步采集的方法,以实现数据的同步采集。方法利用多导睡眠监测设备的鼾声传感器与肠鸣音设备相互敲击产生瞬态脉冲信号作为同步标记信号,基于同步标记信号的三阶累积量实现同步标记信号的识别和对齐,并采用多组同步标记信号评价数据同步的精度。结果多导睡眠监测设备的鼾声传感器和肠鸣音设备相互敲击,产生了清晰明确的同步标记脉冲信号,结合时域特征和三阶累积量实现了同步标记信号的精确识别和对齐。经过多组同步标记信号识别验证表明,此种同步方法可保证同步精度范围在5 ms内。结论该数据同步采集方法简单易行,可保证多导睡眠监测设备和肠鸣音设备的高精度同步采集,同时也为其他完全独立的多个设备数据同步采集提供参考。

关键词：多导睡眠监测肠鸣音设备瞬态敲击信号数据同步采集

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Valuation of CDS counterparty risk under a reduced-form model with regime-switching shot noise default intensities

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Frontiers of Mathematics in China 2017年第5期12卷 1085-1112页

作者： Yinghui DONG Kam Chuen YUEN guojing wang Department of Mathematics and Physics Suzhou University of Science and TechnologySuzhou 215009 China Department of Statistics and Actuarial Science University of Hong Kong Hong KongChina Department of Mathematics and Center for Financial Engineering Soochow UniversitySuzhou 215006 China

We study the counterparty risk for a credit default swap （CDS） in a regime-switching market driven by an underlying continuous-time Markov chain. We model the default dependence via some correlated Cox processes with regime-switching shot noise intensities containing common shock. Under the proposed model, the general bilateral counterparty risk pricing formula for CDS contracts with the possibility of joint defaults is presented. Based on some expressions for the conditional Laplace transform of the integrated intensity processes, semi-analytical solution for the bilateral credit valuation adjustment （CVA） is derived. When the model parameters satisfy some conditions, explicit formula for the bilateral CVA at time 0 is also given.

关键词： Credit default swap (CDS) bilateral credit valuation adjustment,Markov chain common shock regime-switching shot noise process

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Energy band engineering of Bi_(2)O_(2.33)–CdS direct Z-scheme heterojunction for enhanced photocatalytic reduction of CO_(2)

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Journal of Materials Science & Technology 2022年第16期111卷 17-27页

作者： guojing wang Zhiwei Tang Jing wang Shasha Lv Yunjie Xiang Feng Li Chong Liu School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Department of Electronic Materials Science and Engineering School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China Key Laboratory of Beam Technology and Material Modification Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China School of Materials and Energy Southwest UniversityChongqing 404100China

In this work,a Bi_(2)O_(2.33)–CdS direct Z-scheme heterojunction was fabricated based on energy band *** Bi_(2)O_(2.33)core nanoflakes were first synthesized by electrodeposition which was followed by an annealing process to fabricate this *** the Cd S shell was deposited on Bi_(2)O_(2.33)nanoflakes utilizing the solution method,during which a suitable concentration of Cd Clsolution was used for forming a homogeneous and continuous integrated CdS shell.A space charge region and an internal electric field from CdS(+)to Bi_(2)O_(2.33)(-),which drove a direct Z-scheme charge transfer process,were formed at the *** Bi_(2)O_(2.33)–CdS exhibited excellent photocatalytic performance for CO_(2)reduction mainly attributed to the satisfactory photoinduced charge separation and transport efficiency in the direct Z-scheme *** photocatalytic CO_(2)reduction ability of Bi_(2)O_(2.33)–CdS was significantly enhanced compared with single Bi_(2)O_(2.33)or Cd S,with a CO_(2)yield rate of ca.2.9μmol/(cm^(2)h)under a 300 W Xe *** reduction of CO_(2)to CO_(2)demonstrated 94.0%selectivity.

关键词： Photocatalysis Cds Nanocomposite Vacancies Direct z-scheme heterojunction

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