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Numerical Simulation to Evaluate the Effects of Upward Lightning Discharges on Thunderstorm Electrical Parameters

Advances in Atmospheric Sciences 2021年第3期38卷 446-459页

作者： Tianxue ZHENG Yongbo TAN yiru wang Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory for Aerosol–Cloud–Precipitation of China Meteorological AdministrationNanjing University of Information Science and Technology Nanjing 210044China 2State Key Laboratory of Severe WeatherChinese Academy of Meteorological SciencesBeijing 100081China

A theoretical discussion of the discharge effects of upward lightning simulated with a fine-resolution 2D thunderstorm model is performed in this paper,and the results reveal that the estimates of the total induced charge on the upward lightning discharge channels range from 0.67 to 118.8 C,and the average value is 19.0 C,while the ratio of the induced charge on the leader channels to the total opposite-polarity charge in the discharge region ranges from 5.9%to 47.3%,with an average value of 14.7%.Moreover,the average value of the space electrostatic energy consumed by upward lightning is 1.06×10^9 *** above values are lower than those related to intracloud lightning *** density of the deposited opposite-polarity charge is comparable in magnitude to that of the preexisting charge in the discharge area,and the deposition of these opposite-polarity charges rapidly destroys the original space potential well in the discharge area and greatly reduces the space electric field *** addition,these opposite-polarity charges are redistributed with the development of *** space charge redistribution caused by lightning discharges partly accounts for the complexity of the charge structures in a thunderstorm,and the complexity gradually decreases with the charge neutralization process.

关键词： numerical simulation upward lightning induced charge variation of charge distribution electrostatic energy

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Iterative Phase Noise Suppression for Full-Duplex Communication Systems

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China Communications 2023年第2期20卷 226-234页

作者： Pengxin Guan yiru wang Hongkang Yu Yuping Zhao School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China Wireless Product Research and Development Institute ZTE CorporationShenzhen 518057China

Oscillator phase noise is one of the bottlenecks that limits the self-interference(SI)cancellation capability of full-duplex *** this paper,we propose a method for the suppression of common phase error(CPE)and intercarrier interference(ICI)induced by the phase noise in full-duplex orthogonal frequency division multiplexing(OFDM)***,we regard the effect of CPE as a portion of the SI channel and perform estimation,reconstruction and elimination in the time ***,the ICI signal is estimated and suppressed in the frequency ***,by analysing the performance of proposed algorithm,we further develop an iterative mechanism to reduce the parameter estimation error and improve SI cancellation *** results show that the proposed method has a significant SI cancellation capability improvement over the traditional SI cancellation schemes.

关键词： full-duplex self-interference phase noise suppression

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Highly uniform ultrasound-sensitive nanospheres produced by a pH-induced micelle-to-vesicle transition for tumor-targeted drug delivery

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Nano Research 2018年第7期11卷 3710-3721页

作者： yiru wang Tinghui Yin Zhenwei Su Chen Qiu Yong wang Rongqin Zheng Meiwan Chen Xintao Shuai Guangdong Provincial Key Lab of Liver Disease and Department of Medical Ultrasonics The Third Affiliated Hospital of Sun Yat-sen University Guangzhou 510630 China PCFM Lab of Ministry of Education School of Materials Sdence and Engineering Sun Yat-sen University Guangzhou 510275 China State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical Sciences University of Macao Macao 999078 China

Although gas-filled microbubbles with high echogenicity are widely applied in clinical ultrasonography, the micron scale particle size impedes their use in the treatment of solid tumors, which are accessible to objects less than several hundred nanometers. We herein propose an unusual approach involving a pH-induced core-shell micelle-to-vesicle transition to prepare ultrasound-sensitive polymeric nanospheres （polymersomes in structure） possessing multiple features, including nanosize, monodispersity, and incorporation of a phase- transitional imaging agent into the aqueous lumen. These features are not achievable via the conventional double-emulsion method for polymersome preparation. The nanospheres were constructed based on a novel triblock copolymer with dual pH sensitivity. The liquid-to-gas phase transition of the imaging agent induced by external low-frequency ultrasound may destroy the nanospheres for a rapid drug release, with simultaneous tissue-penetrating drug delivery inside a tumor. These effects may provide new opportunities for the development of an effective cancer therapy with few adverse effects.

关键词： micelle polymersome morphological transition ultrasound-sensitive tumor-penetratingdelivery

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Analyst Coverage,Forecasting Bias,and Corporate Innovation:Evidence from China

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Journal of Systems Science and Information 2024年第1期12卷 1-24页

作者： Xinping MA yiru wang Jianping LI Biao SHI School of Economics and Management University of Chinese Academy of SciencesBeijing 100049China School of Finance Nankai UniversityTianjin 300071China Institutes of Science and Development Chinese Academy of SciencesBeijing 100190China

Due to information asymmetry and strategic innovation,firms often encounter challenges related to insufficient driving forces and low-quality innovation *** always act as information intermediaries who help foster the advancement of corporate innovation activities and the conversion of innovation *** study examines the impact of analyst coverage and forecasting bias on corporate innovation,employing data from China A-shared listed firms spanning the period 2007 to *** measure corporate innovation from two perspectives:Input and ***,we use the ratio of research and development(R&D)expenditure to sales as a proxy for the innovation input and the number of patent citations excluding self-citations to measure innovation *** find that analyst coverage promotes corporate innovation,which is consistent with the“bright”side of analyst ***,the positive effect of analyst coverage hinges on effectively transmitting and disclosing accurate information to investors in the capital *** on this,analysts'forecasting bias includes forecasting dispersion and optimism *** find evidence that an increase in analysts'forecast dispersion leads to a decrease in corporate innovation ***,this paper presents a novel approach by employing the regression discontinuity method to examine the effect of analyst optimistic bias on firm *** empirical findings reveal that overly optimistic forecasts by analysts exacerbate innovation *** analyses enrich the research on analyst coverage and corporate innovation,providing an empirical basis for improving the capital market with the help of analysts.

关键词： analyst coverage forecasting bias corporate innovation innovation quality

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Three dimensional phytic acid-induced graphene as a solid-phase microextraction fiber coating and its analytical applications for nerolidol in tea

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Chinese Chemical Letters 2018年第1期29卷 107-110页

作者： Shujun Xia Jing Dong Yiying Chen yiru wang Xi Chen Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation College of Chemistry and Chemical Engineering Xiamen University State Key Laboratory of Marine Environmental Science Xiamen University

In this work, three dimensional phytic acid-induced graphene coating was prepared by hydrothermal synthesis and fabricated on a stainless-steel wire using physical coating method as a solid phase microextraction （SPME） coating. The graphene coating revealed high specific surface area, extraordinary electrical conductivity and excellent chemical stability. Coupled with gas chromatography-flame ionization detector （GC-FID）, the home-made phytic acid-induced graphene SPME fiber exhibited excellent extraction efficiency for the analysis of nerolidol in tea samples. Under the optimized conditions, the linear range of working curve was found to be 1-1000 ng/g, and the limit of detection of nerolidol was 0.18 ng/g. The coefficient variation of repeatability for each single fiber and reproducibility for fiber to fiber was less than 3.9Yg and 8.3~, respectively.

关键词： Phytic acid-induced grapheneSolid phase microextractionGas chromatographyNerolidolTea

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Automated Determination of Cd^(2+) and Pb^(2+) in Natural Waters with Sequential Injection Analysis Device Using Differential Pulse Anodic Stripping Voltammetry

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Journal of Analysis and Testing 2021年第1期5卷 60-68页

作者： Zhiwei Lai Fangyuan Lin Yipeng Huang yiru wang Xi Chen MOE Key Laboratory of Spectrochemical Analysis and Instrumentation College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361005China

An electrochemical flow device has been developed for the determination of heavy metal ions(HMI)in water using multiwalled carbon nanotubes(MWCNTs)/Nafion(NA)/Hg electrode,by mean of diff erential pulse anodic stripping voltammetry coupled with sequential injection *** accuracy of the determination was ensured by the great electrical conductivity of MWCNTs and the high adsorption capacity of *** was used for MWCNTs immobilization for the long-term application of the *** mercury film was cleaned after determination and another one would form during deposition.A lower limit of detection and a wider determination range of Cd^(2+)and Pb^(2+)could be achieved using the automatically analytical device combining with the MWCNTs/NA/Hg-modified *** real-time monitoring of Cd^(2+)and Pb^(2+)in fresh water using this device continued for 10 *** results indicated that the method was potential for on-site and real-time determination of HMI in water samples.

关键词： Electrochemical flow device Differential pulse anodic stripping voltammetry Cd^(2+) Pb^(2+) Water samples

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Embedding lead halide perovskite quantum dots in carboxybenzene microcrystals improves stability

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Nano Research 2017年第8期10卷 2692-2698页

作者： Wei Xu Zhixiong Cai Feiming Li Jing Dong yiru wang Yaqi Jiang Xi Chen Deportment of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China State Key Laboratory of Marine Environmental Science Xiamen University Xiamen 361005 China

The stability of lead halide perovskite quantum dots （PQDs） was improved by embedding them in carboxybenzene microcrystals. The resulting needle-shaped mixed microcrystals preserved the strong photoluminescence of the PQDs. Compared with previously reported polystyrene-encapsulated PQDs, the carboxybenzene crystals were robust and protected the dots from moisture and photodegradation. The enhanced stability was attributed to the tight matrix of carboxybenzene microcrystals, which protected the PQDs from moisture. This versatile strategy protected various QDs, including all-inorganic PQDs and chalcogenide QDs （e.g., CdSe/ZnS QDs and CuInS/ZnS QDs）. It provides a facile and versatile method of protecting PQDs and may enable applications in solid-state systems with high color quality requirements such as displays, lasers, and light emitting diodes.

关键词： perovskite nanocrystals perovskite quantum dots down-conversion white LEDs carboxybenzene crystals

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Development of Multi-Agent-Based Indoor 3D Reconstruction

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Computers, Materials & Continua 2024年第10期81卷 161-181页

作者： Hoi Chuen Cheng Frederick Ziyang Hong Babar Hussain yiru wang Chik Patrick Yue Optical Wireless Lab Department of Electronic and Computer EngineeringThe Hong Kong University of Science and TechnologyHong KongChina

Large-scale indoor 3D reconstruction with multiple robots faces challenges in core enabling *** work contributes to a framework addressing localization,coordination,and vision processing for multi-agent reconstruction.A system architecture fusing visible light positioning,multi-agent path finding via reinforcement learning,and 360°camera techniques for 3D reconstruction is *** visible light positioning algorithm leverages existing lighting for centimeter-level localization without additional ***,a decentralized reinforcement learning approach is developed to solve the multi-agent path finding problem,with communications among agents *** 3D reconstruction pipeline utilizes equirectangular projection from 360°cameras to facilitate depth-independent reconstruction from posed monocular images using neural *** validation demonstrates centimeter-level indoor navigation and 3D scene reconstruction capabilities of our *** challenges and limitations stemming from the above enabling technologies are discussed at the end of each corresponding *** summary,this research advances fundamental techniques for multi-robot indoor 3D modeling,contributing to automated,data-driven applications through coordinated robot navigation,perception,and modeling.

关键词： Multi-agent system multi-robot human collaboration visible light communication visible light positioning 3D reconstruction reinforcement learning multi-agent path finding

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Divergent chondro/osteogenic transduction laws of fibrocartilage stem cell drive temporomandibular joint osteoarthritis in growing mice

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International Journal of Oral Science 2023年第3期15卷 462-475页

作者： Ruiye Bi Qianli Li Haohan Li Peng wang Han Fang Xianni Yang yiru wang Yi Hou Binbin Ying Songsong Zhu State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases&Department of Orthognathic and TMJ Surgery West China Hospital of StomatologySichuan UniversityChengduChina State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases&West China Hospital of Stomatology Sichuan UniversityChengduChina Department of Stomatology Ningbo First HospitalNingboChina

The anterior disc displacement(ADD)leads to temporomandibular joint osteoarthritis(TMJOA)and mandibular growth retardation in *** investigate the potential functional role of fibrocartilage stem cells(FCSCs)during the process,a surgical ADDTMJOA mouse model was *** 1 week after model generation,ADD mice exhibited aggravated mandibular growth retardation with osteoarthritis(OA)-like joint cartilage degeneration,manifesting with impaired chondrogenic differentiation and loss of subchondral bone *** tracing using Gli1^(-)CreER^(+);Tm^(fl/-)mice and Sox9-CreER^(+);Tm^(fl/-)mice showed that ADD interfered with the chondrogenic capacity of Gli1+FCSCs as well as osteogenic differentiation of Sox9+lineage,mainly in the middle zone of TMJ ***,a surgically induced disc reposition(DR)mouse model was *** inhibited FCSCs capacity was significantly alleviated by DR treatment in ADD *** both the ADD mice and adolescent ADD patients had significantly relieved OA phenotype and improved condylar growth after DR *** conclusion,ADD-TMJOA leads to impaired chondrogenic progenitor capacity and osteogenesis differentiation of FCSCs lineage,resulting in cartilage degeneration and loss of subchondral bone homeostasis,finally causing TMJ growth *** at an early stage could significantly alleviate cartilage degeneration and restore TMJ cartilage growth potential.

关键词： cartilage impaired degeneration

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Retina-inspired organic neuromorphic vision sensor with polarity modulation for decoding light information

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Light(Science & Applications) 2023年第11期12卷 2508-2518页

作者： Ting Jiang yiru wang Wanxin Huang Haifeng Ling Guofeng Tian Yunfeng Deng Yanhou Geng Deyang Ji Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Science Department of ChemistryInstitute of Molecular Aggregation ScienceTianjin University300072 TianjinChina Haihe Laboratory of Sustainable Chemical Transformations 300192 TianjinChina State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials Nanjing University of Posts&Telecommunications210023 NanjingChina State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology100029 BeijingChina School of Materials Science and Engineering Tianjin University300072 TianjinChina Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University300072 TianjinChina Collaborative Innovation Center of Chemical Science and Engineering Tianjin University300072 TianjinChina

The neuromorphic vision sensor(NeuVS),which is based on organic field-effect transistors(OFETs),uses polar functional groups(PFGs)in polymer dielectrics as interfacial units to control charge ***,the mechanism of modulating charge transport on basis of PFGs in devices is ***,the carboxyl group is introduced into polymer dielectrics in this study,and it can induce the charge transfer process at the semiconductor/dielectric interfaces for effective carrier transport,giving rise to the best device mobility up to 20 cm^(2) V^(−1) s^(−1) at a low operating voltage of−1 ***,the polarity modulation effect could further increase the optical figures of merit in NeuVS devices by at least an order of magnitude more than the devices using carboxyl group-free polymer ***,devices containing carboxyl groups improved image sensing for light information decoding with 52 grayscale signals and memory capabilities at an incredibly low power consumption of 1.25 fJ/*** findings provide insight into the production of high-performance polymer dielectrics for NeuVS devices.

关键词： charge polarity light

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