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Improvement of the chirality near avoided resonance crossing in optical microcavity

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Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 55-62页

作者： SONG QingHai GU ZhiYuan ZHANG Nan wang kaiyang YI Ning Bo XIAO ShuMin Department of Electrical and Information Engineering Harbin Institute of Technology State Key Laboratory on Tunable Laser Technology Harbin Institute of Technology

Chirality is one of the important phenomena at the vicinity of exceptional point(EP). The conventional understanding is that the chirality is determined by asymmetrical scattering efficiency(?), which reaches to zero only when the resonance approaches EP. Here we study the possibility to enhance the chirality in open systems with a more robust mechanism. By combining chirality with avoided resonance crossing, we show that the chirality and ? can be dramatically modified. Taking a spiral shaped annular cavity as an example, we show that the chirality of optical resonances can be significantly improved when two sets of chiral states approach each other. The imbalance between counterclockwise(CCW) components and clockwise(CW) components has been enhanced by more than an order of magnitude. Our research provides a new route to tailor and control the chirality in open systems.

关键词： microcavity chirality avoided resonance crossing mode coupling

Overcoming the Limitation of Cs_(2)AgBiBr_(6) Double Perovskite Solar Cells Through Using Mesoporous TiO_(2) Electron Extraction Layer

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Energy & Environmental Materials 2022年第4期5卷 1317-1322页

作者： Dandan Zhao Chao Liang Bingzhe wang Tanghao Liu Qi Wei kaiyang wang Hao Gu Sisi wang Shiliang Mei Guichuan Xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipa Macao 999078China

Lead-free double perovskite Cs_(2)AgBiBr_(6) has gained increasing attention ***,the power conversion efficiency(PCE)of Cs_(2)AgBiBr_(6) perovskite solar cells(PSCs)is still low compared with their lead-based ***,by using photoluminescence(PL),time-resolved photoluminescence(TRPL),and ultrafast transient absorption(TA)measurements,the unbalance between the electron and hole in diffusion and transfer,which limits the performance of the Cs_(2)AgBiBr_(6) PSCs,was further *** this issue,a strategy of using the mesoporous TiO_(2) electron transport layer(ETL)to construct a bulk heterojunction in Cs_(2)AgBiBr_(6) PSCs was ***,the PCE had improved by over 24%comparing with that only used compact TiO_(2) ***,based on mesoporous TiO_(2),the unencapsulated Cs_(2)AgBiBr_(6) PSCs maintained 90%of their initial performance after approximately 1200 h of storage in a desiccator(humidity~30%).This work gives further understanding of Cs_(2)AgBiBr_(6) perovskite and demonstrates that a proper design of balancing the electron and hole diffusion can improve device performance.

关键词： bulk heterostructure charge carrier dynamics Cs_(2)AgBiBr_(6) lead-free double perovskite solar cells

Recent research progress on the phase-field model of microstructural evolution during metal solidification

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International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2095-2111页

作者： kaiyang wang Shaojie Lv Honghui Wu Guilin Wu Shuize wang Junheng Gao Jiaming Zhu Xusheng Yang Xinping Mao Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China School of Civil Engineering Shandong UniversityJinan 250061China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

Solidification structure is a key aspect for understanding the mechanical performance of metal alloys,wherein composition and casting parameters considerably influence solidification and determine the unique microstructure of the *** following the principle of free energy minimization,the phase-field method eliminates the need for tracking the solid/liquid phase interface and has greatly accelerated the research and development efforts geared toward optimizing metal solidification *** recent progress in the application of phasefield simulation to investigate the effect of alloy composition and casting process parameters on the solidification structure of metals is summarized in this *** effects of several typical elements and process parameters,including carbon,boron,silicon,cooling rate,pulling speed,scanning speed,anisotropy,and gravity,on the solidification structure are *** present work also addresses the future prospects of phase-field simulation and aims to facilitate the widespread applications of phase-field approaches in the simulation of microstructures during solidification.

关键词： solidification process phase-field models microstructure evolution alloy composition casting process parameters

A platform for integrated spectrometers based on solution-processable semiconductors

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Light(Science & Applications) 2023年第9期12卷 1739-1748页

作者： Yanhao Li Xiong Jiang Yimu Chen Yuhan wang Yunkai Wu De Yu kaiyang wang Sai Bai Shumin Xiao Qinghai Song Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of Technology(Shenzhen)ShenzhenGuangdong 518055China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuan 611731China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShan`xi 030006China

Acquiring real-time spectral information in point-of-care diagnosis,internet-of-thing,and other lab-on-chip applications require spectrometers with hetero-integration capability and miniaturized *** to conventional semiconductors integrated by heteroepitaxy,solution-processable semiconductors provide a much-flexible integration platform due to their solution-processability,and,therefore,more suitable for the multi-material integrated ***,solution-processable semiconductors are usually incompatible with the micro-fabrication *** work proposes a facile and universal platform to fabricate integrated spectrometers with semiconductor substitutability by unprecedently involving the conjugated mode of the bound states in the continuum(conjugated-BIC)***,exploiting the conjugated-BIC photonics,which remains unexplored in conventional lasing studies,renders the broadband photodiodes with ultra-narrowband detection ability,detection wavelength tunability,and on-chip integration ability while ensuring the device *** based on these ultra-narrowband photodiode arrays exhibit high spectral resolution and wide/tunable spectral *** fabrication processes are compatible with solution-processable semiconductors photodiodes like perovskites and quantum dots,which can be potentially extended to conventional *** from the spectrometers directly constitute the incident spectra without being computation-intensive,latency-sensitive,and *** an example,the integrated spectrometers based on perovskite photodiodes are capable of realizing narrowband/broadband light reconstruction and in-situ hyperspectral imaging.

关键词： semiconductors process integration

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从施工地质灾害看岩体结构动态控制作用

岩石力学与工程学报 2013年第6期32卷 1129-1136页

作者：尚彦军李坤王开洋中国科学院地质与地球物理所工程地质力学重点实验室北京100029

在我国岩石工程规模加大、趋深而施工扰动范围趋广和趋强的今天,难以避让的不良地质体中常出现的施工地质灾害已成为影响工期和造价的极重要因素。工程实践观测到以不良地质体为主的岩体结构动态变化及其对快速、高强度工程开挖扰动的... 详细信息

在我国岩石工程规模加大、趋深而施工扰动范围趋广和趋强的今天,难以避让的不良地质体中常出现的施工地质灾害已成为影响工期和造价的极重要因素。工程实践观测到以不良地质体为主的岩体结构动态变化及其对快速、高强度工程开挖扰动的响应很复杂。理论上需认识不同层次和不同部位岩体变形破坏反映出的结构动态变化和调整,对其控制作用和工程调控需从相互作用时间变化角度加以表述,同时为"短进尺"等地下工程施工经验提供依据。通过总结、回顾岩体结构控制论发展和适用性,结合岩石工程中不良地质体有关的施工地质灾害防治实践,提出基于变形破坏时效性的岩体结构动态控制观(DDC)。以平行于背斜轴部展布的上公山隧洞围岩施工地质灾害导致工期延误和方案多次变更为例,说明岩体结构动态变化是工程施工扰动作用的集中体现和客观结果。本文结果或可为深入研究岩体变形破坏时效性提供一定地质基础。

关键词：岩石力学岩体结构控制论不良地质体施工地质灾害岩体结构动态控制观

Light-induced phase transition and photochromism in all-inorganic two-dimensional Cs2PbI2Cl2 perovskite

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Science China Materials 2020年第8期63卷 1510-1517页

作者： Xiaojun Li Mingming Chen Shiliang Mei Bingzhe wang kaiyang wang Guichuan Xing Zikang Tang Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacao 999078China Department of Physics Jiangsu UniversityZhenjiang 212013China

Organic-inorganic hybrid two-dimensional(2D)ruddlesden-popper(RP)perovskites with fantastic optoelectronic properties and good stability have attracted tremendous attention for the potential applications in photovoltaics and ***,a new allinorganic Cs2PbI2Cl22D perovskite has been proposed with excellent excitonic absorption and improved ambient and thermal ***,an interesting light-induced phase transition and photochromism in the Cs2PbI2Cl2were *** low fluence light pumping,the room temperature photoluminescence(PL)of Cs2PbI2Cl2is dominated by a weak violet excitonic emission peaked at 412 ***,the emission color gradually changes from violet to bright red while increasing the laser pumping *** photochromic effect is determined to be caused by forming CsPbI3phase within the Cs2PbI2Cl2crystals,which is efficiently driven by thermal *** to protection by the Cs2PbI2Cl2matrix,the embedded CsPbI3nanocrystals show improved stability than standard pure ***,the Cs2PbI2Cl2perovskite with photochromic feature may find applications in optical encryption,as preliminarily shown in this work.

关键词： Cs2PbI2Cl2 light-induced phase transition photochromism optical encryption

Effects of Low Temperature Plasma on the Forms of Heavy Metals in Sludge

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Meteorological and Environmental Research 2019年第1期10卷 52-54,58页

作者： Xu Fuyin Hu Yanyan Chen Xiang Bao Bing wang kaiyang Chongqing Landscape and Gardening Research Institute Chongqing Urban Landscape Engineering Technology Research Center Plasma Kleening Technologies LLC

Low temperature plasma was used to treat sludge,and the effects of discharge time on the content of different forms of heavy metals in the sludge were studied. The results showed that Cu and Zn content in the domestic sludge could basically meet the requirements of GB 4284-2018,GB/T 23486-2009,CJ/T 362-2011 and CJ/T 309-2009. There were big differences between different forms of the heavy metals. According to the proportions of different forms of Cu in the sludge,different forms of Cu are arranged as follows: organic state > carbonate bound state> residual state > exchangeable state > iron-manganese oxidation state,and Cu mainly existed in an organic state. Various forms of Zn are arranged in order of the proportion as follows: iron-manganese oxidation state > residual state > carbonate bound state > exchangeable state > organic state,and Zn mainly existed in an iron-manganese oxidation state. After the treatment of sludge by low temperature plasma,the content of exchangeable Cu and Zn in the sludge increased,while the content and proportion of residual Cu and Zn all reduced.

关键词： Low temperature plasma Sludge Heavy metals Exchangeable state Carbonate bound state Iron-manganese oxidation state Organic state Residual state

贯彻《通用规范汉字表》需要澄清误解——以朱大可《汉字革命和文化断裂》为例

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山东师范大学学报（人文社会科学版） 2009年第5期54卷 67-76页

作者：王开扬山东师范大学文学院山东济南250014

教育部、国家语委《通用规范汉字表》是中国今后一个时期在"通用"领域使用汉字必须遵守的规范。贯彻该《字表》必须澄清前一时期文化界对简化字的种种误解。朱大可所持简化字是"字母共产主义化"、"毛体字",造成"文化断裂"的观点,以及他... 详细信息

教育部、国家语委《通用规范汉字表》是中国今后一个时期在"通用"领域使用汉字必须遵守的规范。贯彻该《字表》必须澄清前一时期文化界对简化字的种种误解。朱大可所持简化字是"字母共产主义化"、"毛体字",造成"文化断裂"的观点,以及他对某些字形的解说,对推行规范汉字有阻力作用。建议文化名人了解语言文字知识和汉字改革历史。

关键词：通用规范汉字表文化界误解朱大可汉字革命

推动中国商品住宅价格的主要因素:时期与城市差异

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系统工程理论与实践 2018年第9期38卷 2256-2266页

作者：杨海珍向悦王开阳中国科学院大学经济与管理学院

本文梳理、总结商品住宅价格变动的影响因素和机理,在对中国城市房价特征的变化时点进行识别并根据城市房价波动特点进行分类的基础上,运用面板门槛回归模型,对中国35个大中城市2001至2015年商品住宅价格波动影响因素的时期与城市差异... 详细信息

本文梳理、总结商品住宅价格变动的影响因素和机理,在对中国城市房价特征的变化时点进行识别并根据城市房价波动特点进行分类的基础上,运用面板门槛回归模型,对中国35个大中城市2001至2015年商品住宅价格波动影响因素的时期与城市差异进行了实证研究.研究结果表明：2009年后我国城市房价的主要影响因素发生了改变,个人住房信贷可获得性、土地财政和土地供给对房价的影响显著增强,股票市场的投资替代品作用显现;对于不同城市类别,＂北上广深＂和热门＂二线＂城市构成的第1、2类城市房价在2009年后受土地财政、土地供给和个人住房信贷可获得性的影响较大,经济发展相对靠后的第3类城市房价在2009年后主要受收入水平推动.

关键词：房地产市场住宅价格影响因素时期变化城市差异