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CLEO: Applications and technology in CLEO 2024, CLEO: A and T 2024 - Part of Conference on Lasers and Electro-Optics

作者： Zhong, Yutong Li, Yongzhuo Feng, Jiabin Li, Chen Xu, Jialu Yu, Chenxin Ning, Cun-Zheng Department of Electronic Engineering Tsinghua University Beijing100084 China College of Integrated Circuits and Optoelectronic Chips Shenzhen Technology University Guangdong Shenzhen518118 China

We demonstrate an efficient infrared light-emitting diode based on a type-I Mote2/WSe2 heterostructure with a record EQE of 1% at room temperature, where multilayer WSe2 boosts carrier transport while monolayer Mote2 ... 详细信息

关键词： Light emitting diodes

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Expressway bottleneck pattern identification using traffic big data-The case of ring roads in Beijing, china

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JOURNAL OF INTELLIGENT TRANSPORTATION SYSTEMS 2020年第1期24卷 54-67页

作者： Yang, Yanni Li, Meng Yu, Jiaying He, Fang Capital Univ Econ & Business Informat Sch CTS Ctr Beijing Peoples R China Tsinghua Univ Dept Civil Engn Beijing Peoples R China Tsinghua Univ Dept Ind Engn Beijing Peoples R China

How to efficiently identify traffic bottlenecks in the expressway network and implement targeted measures is an important issue to mitigate traffic congestion. In recent years, with the proliferation of smartphones, smartphone-based navigation applications are receiving the worldwide popularity, which are being treated as an extremely rich source of traffic data. In this paper, we are devoted to proposing a novel approach to investigate traffic state and identify recurrent bottlenecks quickly and accurately from macroscopic network perspective, through fusing the data sources of fixed detectors and mobile navigation apps. First of all, this paper plots flow-speed fundamental diagram to derive critical speed, which is treated as the criterion to determine traffic state. Once the criterion has been established, typical bottlenecks in the entire expressway network can be efficiently identified through only utilizing smartphone-based probe speed data. Secondly, three pioneering indicators are put forward to quantify oversaturated traffic state and classify bottleneck patterns on urban expressway network. Applying this methodology, we take Beijing expressway network as a case to identify different patterns of bottlenecks, which are validated to comply with the reality. Moreover, the relationship between critical speed and the associated road segment features is explored and shows the possibility of predicting the critical speed even without flow data. As an end, some recommendations are proposed for improving different types of traffic bottlenecks.

关键词： Critical speed data fusion expressway bottleneck fundamental diagram oversaturated state

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Photon-limited non-imaging object detection and classification based on single-pixel imaging system

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APPLIED PHYSICS B-LASERS AND OPTICS 2020年第1期126卷 1-8页

作者： Zhu, Yan Shi, Jianhong Wu, Xiaoyan Liu, Xialin Zeng, Guihua Sun, Jun Tian, Lulu Su, Feng Shanghai Jiao Tong Univ Ctr Quantum Sensing & Informat Proc State Key Lab Adv Opt Commun Syst & Networks Shanghai 200240 Peoples R China Shanghai Aerosp Control Technol Inst Shanghai Peoples R China Shanghai Key Lab Oratory Aerosp Intelligent Contr Shanghai Peoples R China

Under photon-limited detection which is limited by the low-light illumination and short detection time, off-the-shelf classification methods based on clear imaging of the object cannot achieve considerable classification accuracy. To solve this problem, we propose a non-imaging classification method based on single-pixel imaging system. With low-intensity pulsed illumination and time-correlated single-photon counting detection, binarized feature sequence of the objects that need to be classified can be obtained. Combining with a simple machine learning algorithm trained with simulated data based on Poissonian photon detection algorithm, the objects could be classified with considerable accuracy. Proof-of-principle experiments use the MNIST handwriting digit database, showing that up to 90% classification accuracy could be achieved with fewer than 1 detected photon per pixel.

关键词： Object detection

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Tunable anomalous resistance and large magnetoresistance in HfTe5 by atom doping

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APPLIED PHYSICS LETTERS 2024年第12期124卷 122401-122401页

作者： Ning, Jiai Zhuge, Minghua An, Hongyu He, Liang Shenzhen Technol Univ Coll Integrated Circuits & Optoelect Chips Shenzhen 518118 Peoples R China Nanjing Univ Sch Elect Sci & Engn Nanjing 210093 Peoples R China Shenzhen Technol Univ Coll New Mat & New Energies Shenzhen 518118 Peoples R China

The Dirac layered material HfTe5 renews significant interest due to its exotic band structure, leading to abundant transport properties, such as the anomaly resistance peak and its large magnetoresistance. Here, we prepared single crystals HfTe5 and Cr-doped CrxHf1-xTe5 and carried out their electrical transport measurements to explore the underlying physical origin of the anomaly resistance behavior and the large magnetoresistance. An anomalous resistance peak was observed in both intrinsic HfTe5 and the Cr-doped ones. Specifically, the peak temperature in the doped ones experiences an obvious shift from 52 to 34 K as the doping concentration x increases from 0 to 0.15, as well as the magnitude of the peak resistance is significantly enhanced. Furthermore, the magnetoresistance of CrxHf1-xTe5 is reduced by more than one order of magnitude compared with the intrinsic one. The significant reduction in magnetoresistance after Cr doping is attributed to the breaking of the balance between electron and hole carriers, which is confirmed by Kohler's plots. Meanwhile, in the sample where the magnetoresistance was minimized, we observed Shubnikov-de Haas oscillations. These observations illustrate that the large magnetoresistance is primarily contributed by the compensation of electrons and holes rather than the high mobility. Our findings provide valuable insight into how to engineer HfTe5 to achieve large magnetoresistance and its further applications in magnetic sensors and spintronics.

关键词： Tellurium compounds

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The Effect of Audio Trigger's Frequency on Autonomous Sensory Meridian Response

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IEEE Transactions on Cognitive and developmental Systems 2024年第3期17卷 672-681页

作者： Li, Lili Wu, Zhiqing Yu, Zhongliang He, Zhibin Wang, Zhizhong Lin, Liyu Kuang, Shaolong Shenzhen Technology University College of Health Science and Environmental Engineering Guangdong Shenzhen518118 China Shenzhen Technology University College of Integrated Circuits and Optoelectronic Chips Guangdong Shenzhen518118 China Shenzhen Technology University College of New Materials and New Energies Guangdong Shenzhen518118 China

Autonomous sensory meridian response (ASMR) is an experience-dependent sensation in response to audio and audio-visual triggers. The acoustical characteristics of audio trigger have been speculated to be in connection with ASMR. To explore the effect of audio trigger's frequency on ASMR and then to discover ASMR's mechanism, the ASMR phenomenon under random-frequency audio, high-frequency audio, low-frequency audio, original audio, white-noise and rest were analyzed by EEG. The differential entropy and power spectral density were applied to quantitative analysis. The results suggest the audio's frequency can modulate the brain activities on θ, α, β, γ and high γ frequencies. Moreover, ASMR responder and non-responder may be more sensitive to low-frequency audio and white-noise by suppressing brain activities of central areas in γ and high γ frequencies. Further, for ASMR responders, ASMR evoked by low-frequency audio trigger may involve more attentional selection or semantic processing and may not alter the brain functions in information processing and execution. © 2016 IEEE.

关键词： White noise

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Effects of X (X = H2S, SO2 and N2O) mole fractions on adsorption behavior and phase equilibrium properties of CO2 + X mixed gas hydrate

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JOURNAL OF MOLECULAR LIQUIDS 2023年第1期380卷

作者： Sun, Ningru Li, Yanjun Qiu, Nianxiang Francisco, Joseph S. Du, Shiyu Harbin Engn Univ Coll Power & Energy Engn Nantong St Harbin 150001 Peoples R China Chinese Acad Sci Ningbo Inst Mat Technol & Engn Engn Lab Adv Energy Mat Ningbo 315201 Zhejiang Peoples R China Univ Penn Dept Earth & Environm Sci Philadelphia PA 19104 USA Univ Penn Dept Chem Philadelphia PA 19104 USA China Univ Petr East China Sch Mat Sci & Engn Qingdao 266580 Peoples R China Milky Way Sustainable Energy Ltd Zhuhai Peoples R China

As a remedy for air pollution caused by flue gas, Hydrate Based Gas Separation (HBGS) technology is under development. Among many issues in HBGS, the prediction for the adsorption and dissociation conditions of hydrate and the impact from mixed gas on the formation of carbon dioxide hydrate are crucial to understand the sequestration and separation of CO2. In this work, the occupancy isotherms of the mixed systems of CO2 + H2S, CO2 + SO2 and CO2 + N2O with different mole fractions of H2S, SO2 and N2O in sI and sII hydrates are examined. The results show that X (H2S, SO2 and N2O) in flue gases can increase the absorption of mixed gas;CO2 + H2S in the sI and sII hydrates can be categorized as the one-site Langmuir type. The calculated abundance ratio of CO2 to X vary with the mole fraction of impurity gas and pressure, which provide the prerequisite information for prediction of gas recovery yield at different conditions during the CO2 + X gas separate process. The phase equilibria of clathrate hydrates of mixed gases are predicted and the hydration numbers are determined. The results show that the dissociation pressure of mixed hydrates decreases as the impurity gas mole fraction increases, indicating that SO2, H2S and N2O gases can all promote the formation of CO2 hydrate. Additionally, inspection indicates that the mixed flue gas can be efficiently separate by clathrate hydrate. & COPY;2023 Published by Elsevier B.V.

关键词： Gas Hydrate Phase Equilibrium GCMC Simulation Occupancy

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Local chemical ordering enhances simultaneously strength and ductility of Ti-V-Zr-Nb-Al lightweight multi-component alloys

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JOURNAL OF MATERIALS research AND techNOLOGY-JMR&T 2025年 36卷 9289-9297页

作者： Yang, Hengyong Feng, Chuangshi Tang, Yu Xiao, Meng Zeng, Kai Guan, Zhou Song, Tao Yuan, Xin He, Zhicheng Zhang, Jiawei Yang, Chao Zhang, Fuxiang South China Univ Technol Natl Engn Res Ctr Near Net Shape Forming Met Mat Guangdong Prov Key Lab Proc & Forming Adv Met Mat Guangzhou 510640 Peoples R China Songshan Lake Mat Lab Dongguan 523808 Peoples R China

Refractory multi-component alloys display superior mechanical properties at elevated temperatures. However, their brittleness at ambient temperatures, combined with challenging processability, high density, and costeffectiveness, has hindered their widespread application in engineering. In this work, two types of Ti60(V2Zr3Nb2)40(A0) and Ti60(V2Zr3Nb2)34Al6(A6) multi-component alloys with a single Body-Centered Cubic (BCC) structure, were designed based on phase formation principles. These alloys were then manufactured using a combination of vacuum arc melting, cold rolling, and heat treatment processes. It is noteworthy that the A6 alloy present excellent processibility, achieving a 409 % elongation with a 90 % reduction in thickness, and its theoretical density decreased from 5.50 g/cm3 to 5.24 g/cm3 compared to the A0 alloy. Meanwhile, tensile tests revealed that the A6 alloy exhibited a simultaneous increase in yield strength and ductility by 10.3 % and 17.5 %, respectively, when compared to the A0 alloy. The enhanced mechanical properties were mainly attributed to the presence of Local Chemical Ordering (LCO), which was clearly observed in the undeformed sample via transmission electron microscope. Notably, the LCO was significantly influenced by deformation, and no obvious LCO was observed in the deformed alloy. The underline mechanism between LCO and dislocation was also explored. This work provides a strategy for developing novel lightweight refractory multi-component alloys with highstrength-ductility, good processibility and cost-effective.

关键词： Multi-component alloy Mechanical properties Deformation mechanism Processibility Local chemical ordering

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CdSe/CdS纳米晶在壳层形成和生长过程中的形貌调控:表面配体对晶体结构的决定性作用

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Science china Materials 2023年第9期66卷 3621-3628页

作者：郝俊杰刘皓宸段西健周子明赵冰心张文达徐冰孙小卫 Marie-Helene Delville Centre national de la recherche scientifique University of BordeauxBordeaux INPICMCBUMR 5026PessacF-33608France Institute of Nanoscience and Applications and Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China College of Integrated Circuits and Optoelectronic Chips Shenzhen Technology UniversityShenzhen 518118China Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong SAR 999077China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of EducationShenzhen 518055China Shenzhen Planck Innovation Technologies Co. Ltd.Shenzhen 518173China Hainan Provincial Key Laboratory of Fine Chemicals Hainan UniversityHaikou 570228China

CdSe/CdS纳米晶是研究最多的半导体纳米晶之一,然而,仍有许多方面有待研究.本文中,我们揭示了核-壳纳米晶的形貌主要由表面配体和核心浓度控制,而非核心的晶体结构.其中,羧酸镉促进各向同性结构的生长,而相反地,长链膦酸镉有利于各向异... 详细信息

CdSe/CdS纳米晶是研究最多的半导体纳米晶之一,然而,仍有许多方面有待研究.本文中,我们揭示了核-壳纳米晶的形貌主要由表面配体和核心浓度控制,而非核心的晶体结构.其中,羧酸镉促进各向同性结构的生长,而相反地,长链膦酸镉有利于各向异性结构的制备.对于蝌蚪形貌纳米晶,羧酸镉对于头部壳层影响较大,而膦酸镉在各向异性尾部生长中起主要作用.与预期相反, CdSe核心的晶体结构(闪锌矿或纤锌矿)在决定最终的晶体形貌方面几乎没有作用,这可能是由于CdS壳层两个阶段的生长,并导致了蝌蚪形貌的生成.通过选择恰当的表面配体,可以在CdSe/CdS核壳结构形成和生长过程中精确地调控其形貌.在本工作中,蝌蚪、纳米花、点-棒结构、多足结构均可以通过调控表面配体的比率而获得.这种独特的晶体生长机制可以应用于其他基于种子生长的工艺以构筑各向异性纳米结构.

关键词：半导体纳米晶纳米花晶体结构形貌调控晶体形貌各向异性壳层浓度控制

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A highly orientational architecture formed by covalently bonded graphene to achieve high through-plane thermal conductivity of polymer composites

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NANOSCALE 2022年第31期14卷 11171-11178页

作者： Yan, Qingwei Gao, Jingyao Chen, Ding Tao, Peidi Chen, Lu Ying, Junfeng Tan, Xue Lv, Le Dai, Wen Alam, Fakhr E. Yu, Jinhong Wang, Yuezhong Li, He Xue, Chen Nishimura, Kazuhito Wu, Sudong Jiang, Nan Lin, Cheng-Te Chinese Acad Sci Qianwan Inst Ningbo Inst Mat Technol & Engn NIMTE Ningbo 315201 Peoples R China Chinese Acad Sci Ningbo Inst Mat Technol & Engn NIMTE Zhejiang Key Lab Marine Mat & Protect Technol Key Lab Marine Mat & Related Technol Ningbo 315201 Peoples R China Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China Jiangxi Copper Technol Res Inst Co Ltd Nanchang Jiangxi Peoples R China Hunan Univ Coll Mech & Vehicle Engn State Key Lab Adv Design & Mfg Vehicle Body Changsha Peoples R China Univ Technol & Appl Sci Appl Sci Sect Dept Engn Nizwa Oman Kogakuin Univ Mech Syst Engn Adv Nanoproc Engn Lab Tokyo 1920015 Japan Southern Univ Sci & Technol Acad Adv Interdisciplinary Studies Shenzhen 518055 Peoples R China Southern Univ Sci & Technol Guangdong Hong Kong Macao Joint Lab Photon Therma Shenzhen 518055 Peoples R China

Combining the advantages of high thermal conductivities and low graphene contents to fabricate polymer composites for applications in thermal management is still a great challenge due to the high defect degree of exfoliated graphene, the poor orientation of graphene in polymer matrices, and the horrible phonon scattering between graphene/graphene and graphene/polymer interfaces. Herein, mesoplasma chemical vapor deposition (CVD) technology was successfully employed to synthesize vertically aligned graphene nanowalls (GNWs), which are covalently bonded by high-quality CVD graphene nanosheets. The unique architecture leads to an excellent thermal enhancement capacity of the GNWs, and a corresponding composite film with a matrix of polyvinylidene fluoride (PVDF) presented a high through-plane thermal conductivity of 12.8 +/- 0.77 W m(-1) K-1 at a low filler content of 4.0 wt%, resulting in a thermal conductivity enhancement per 1 wt% graphene loading of 1659, which is far superior to that using conventional graphene structures as thermally conductive pathways. In addition, this composite exhibited an excellent capability in cooling a high-power light-emitting diode (LED) device under real application conditions. Our finding provides a new route to prepare high-performance thermal management materials with low filler loadings via the rational design of the microstructures/interfaces of graphene skeletons.

关键词： Graphene

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Scalable non-invasive imaging through dynamic scattering media at low photon flux

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OPTICS AND LASERS IN ENGINEERING 2021年 144卷 106641-106641页

作者： Sun, Yiwei Wu, Xiaoyan Zheng, Yuanyi Fan, Jianping Zeng, Guihua Shanghai Jiao Tong Univ Ctr Quantum Sensing & Informat Proc State Key Lab Adv Opt Commun Syst & Networks Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Affiliated Peoples Hosp 6 Dept Ultrasound Shanghai 200233 Peoples R China Univ North Charlotte Dept Comp Sci Charlotte NC 28223 USA

When the intensity of light reduces to single-photon level, the shot noise becomes dominant. Random scatter, especially the time-varying media will highly increase the photon-limited imaging challenge that the traditional imaging means are inadequate to cope with. In this paper, we develop a new scalable "one to all" imaging approach which focuses on dynamic scattering imaging under photon-limited condition. When the dynamic media optical density is five, we apply this principle to inverse scattering problem and retrieve high-quality images in a real-time way using as little as similar to 0.4 valid detected photons per pixel on average successfully. The effects of lighting intensities and perturbations are analyzed to highlight special significance of the work. The ultimate results demonstrate that one trained strategy is robust to a wide range of statistical variations in dynamic media, which outperforms common "one to one" method and improves the practical utility efficaciously. This non-invasive imaging work promises a wide prospect in photon-limited scattering applications such as in vivo bioimaging and so on.

关键词： Non-invasive imaging Dynamic scattering media Perturbation Photon-limited Deep learning

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