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| 1 | Machine Learning−based Weather Support for the 2022 Winter Olympics显示文摘1.A key support for the 2022 Winter Olympics The XXIV Olympic Winter Games are scheduled to take place from 4 to 22 February 2022,followed by the Paralympic Games from 4 to 13 March,in Beijing and towns in the neighboring Hebei Province,China.Weather plays an extremely important role in the outcome of the games(Chen et al.,2018).It can not only cause a difference between a medal or not,but affect the safety of athletes.Success of the Winter Olympics will greatly depend on weather conditions at the outdoor competition venues,dealing with many weather elements including the snow surface temperature,apparent temperature,gust wind speed,snow,visibility,etc.To ensure that the scheduled games go smoothly,it is imperative to have hourly or even every 10-minutely forecasts as well as updated weather-related risk assessments at the venues for the next 240 hours.So far,the Beijing/Hebei Meteorological Observatory has already started intelligent weather forecasting at 3-km resolution based on the results of numerical weather prediction(NWP)models.However,these experiments have suggested that the current forecasting techniques are incapable of capturing the complex mountain weather variations around some venues.The forecasting capability of NWP is constrained partly by limited knowledge of the local weather mechanisms. | Jiangjiang XIA Haochen LI Yanyan KANG Chen YU Lei JI Lve WU Xiao LOU Guangxiang ZHU Zaiwen Wang Zhongwei YAN Lizhi WANG Jiang ZHU Pingwen ZHANG Min CHEN Yingxin ZHANG Lihao GAO Jiarui HAN | 2020 | Advances in Atmospheric Sciences2020，37，9： | 6 |
| 2 | A 10×10 deep ultraviolet light-emitting micro-LED array显示文摘In this work,we design and fabricate a deep ultraviolet(DUV)light-emitting array consisting of 10×10 micro-LEDs(μ-LEDs)with each device having 20μm in diameter.Strikingly,the array demonstrates a significant enhancement of total light output power by nearly 52%at the injection current of 100 mA,in comparison to a conventional large LED chip whose emitting area is the same as the array.A much higher(~22%)peak external quantum efficiency,as well as a smaller efficiency droop forμ-LED array,was also achieved.The numerical calculation reveals that the performance boost can be attributed to the higher light extraction efficiency at the edge of eachμ-LED.Additionally,the far-field pattern measurement shows that theμ-LED array possesses a better forward directionality of emission.These findings shed light on the enhancement of the DUV LEDs performance and provide new insights in controlling the light behavior of theμ-LEDs. | Huabin Yu Muhammad Hunain Memon Hongfeng Jia Haochen Zhang Meng Tian Shi Fang Danhao Wang Yang Kang Shudan Xiao Shibing Long Haiding Sun | 2022 | Journal of Semiconductors2022，43，6： | 3 |
| 3 | Enhanced photon communication through Bayesian estimation with an SNSPD array显示文摘Laser communication using photons should consider not only the transmission environment’s effects,but also the performance of the single-photon detector used and the photon number distribution.Photon communication based on the superconducting nanowire single-photon detector(SNSPD)is a new technology that addresses the current sensitivity limitations at the level of single photons in deep space communication.The communication’s bit error rate(BER)is limited by dark noise in the space environment and the photon number distribution with a traditional single-pixel SNSPD,which is unable to resolve the photon number distribution.In this work,an enhanced photon communication method was proposed based on the photon number resolving function of four-pixel array SNSPDs.A simulated picture transmission was carried out,and the error rate in this counting mode can be reduced by 2 orders of magnitude when compared with classical optical communication.However,in the communication mode using photon-enhanced counting,the four-pixel response amplitude for counting was found to restrain the communication rate,and this counting mode is extremely dependent on the incident light intensity through experiments,which limits the sensitivity and speed of the SNSPD array’s performance advantage.Therefore,a BER theoretical calculation model for laser communication was presented using the Bayesian estimation algorithm in order to analyze the selection of counting methods for information acquisition under different light intensities and to make better use of the SNSPD array’s high sensitivity and speed and thus to obtain a lower BER.The counting method and theoretical model proposed in this work refer to array SNSPDs in the deep space field. | XIANG LI JINGROU TAN KAIMIN ZHENG LABAO ZHANG LIJIAN ZHANG WEIJI HE PENGWEI HUANG HAOCHEN LI BIAO ZHANG QI CHEN RUI GE SHUYA GUO TAO HUANG XIAOQING JIA QINGYUAN ZHAO XUECOU TU LIN KANG JIAN CHEN PEIHENG WU | 2020 | Photonics Research2020，8，5： | 1 |
| 4 | A Deep Spatio-Temporal Forecasting Model for Multi-Site Weather Prediction Post-Processing显示文摘In this paper, we propose a deep spatio-temporal forecasting model (DeepSTF) for multi-site weather prediction post-processing by using both temporal andspatial information. In our proposed framework, the spatio-temporal information ismodeled by a CNN (convolutional neural network) module and an encoder-decoderstructure with the attention mechanism. The novelty of our work lies in that our modeltakes full account of temporal and spatial characteristics and obtain forecasts of multiple meteorological stations simultaneously by using the same framework. We applythe DeepSTF model to short-term weather prediction at 226 meteorological stations inBeijing. It significantly improves the short-term forecasts compared to other widelyused benchmark models including the Model Output Statistics method. In order toevaluate the uncertainty of the model parameters, we estimate the confidence intervals by bootstrapping. The results show that the prediction accuracy of the DeepSTFmodel has strong stability. Finally, we evaluate the impact of seasonal changes and topographical differences on the accuracy of the model predictions. The results indicatethat our proposed model has high prediction accuracy. | Wenjia Kong Haochen Li Chen Yu Jiangjiang Xia Yanyan Kang Pingwen Zhang | 2022 | Communications in Computational Physics2022，31，1： | 1 |
| 5 | Highly Integrated Multiplexing and Buffering Electronics for Large Aperture Ultrasonic Arrays显示文摘Large aperture ultrasonic arrays can be implemented by tiling together multiple pretested modules of high-density acoustic arrays with closely integrated multiplexing and buffering electronics to form a larger aperture with high yield.These modular arrays can be used to implement large 1.75D array apertures capable of focusing in elevation for uniform slice thickness along the axial direction which can improve image contrast.An important goal for large array tiling is obtaining high yield and sensitivity while reducing extraneous image artifacts.We have been developing tileable acoustic-electric modules for the implementation of large array apertures utilizing Application Specific Integrated Circuits(ASICs)implemented using 0.35μm high voltage(50 V)CMOS.Multiple generations of ASICs have been designed and tested.The ASICs were integrated with high-density transducer arrays for acoustic testing and imaging.The modules were further interfaced to a Verasonics Vantage imaging system and were used to image industry standard ultrasound phantoms.The first-generation modules comprise ASICs with both multiplexing and buffering electronics on-chip and have demonstrated a switching artifact which was visible in the images.A second-generation ASIC design incorporates low switching injection circuits which effectively mitigate the artifacts observed with the first-generation devices.Here,we present the architecture of the two ASIC designs and module types as well imaging results that demonstrate reduction in switching artifacts for the second-generation devices. | Robert Wodnicki Haochen Kang Di Li Douglas N.Stephens Hayong Jung Yizhe Sun Ruimin Chen Lai-Ming Jiang Nestor E.Cabrera-Munoz Josquin Foiret Qifa Zhou Katherine W.Ferrara | 2022 | Biomedical Engineering Frontiers2022，3，1： | 0 |
| 6 | Erratum to “Highly Integrated Multiplexing and Buffering Electronics for Large Aperture Ultrasonic Arrays”显示文摘In the article titled“Highly Integrated Multiplexing and Buffering Electronics for Large Aperture Ultrasonic Arrays”[1],there was an error in figure 7.The figure should show as per the submitted files. | Robert Wodnicki Haochen Kang Di Li Douglas N.Stephens Hayong Jung Yizhe Sun Ruimin Chen Lai-Ming Jiang Nestor E.Cabrera-Munoz Josquin Foiret Qifa Zhou Katherine W.Ferrara | 2022 | Biomedical Engineering Frontiers2022，3，1： | 0 |
| 7 | Navigation in virtual and real environment using brain computer interface:a progress report显示文摘A brain-computer interface (BCI) facilitates bypassing the peripheral nervous system and directly communicating with surrounding devices. Navigation technology using BCI has developed-from exploring the prototype paradigm in the virtual environment (VE) to accurately completing the locomotion intention of the operator in the form of a powered wheelchair or mobile robot in a real environment. This paper summarizes BCI navigation applications that have been used in both real and VEs in the past 20 years. Horizontal comparisons were conducted between various paradigms applied to BCI and their unique signal-processing methods. Owing to the shift in the control mode from synchronous to asynchronous, the development trend of navigation applications in the VE was also reviewed. The contrast between high level commands and low-level commands is introduced as the main line to review the two major applications of BCI navigation in real environments: mobile robots and unmanned aerial vehicles (UAVs). Finally, applications of BCI navigation to scenarios outside the laboratory;research challenges, including human factors in navigation application interaction design;and the feasibility of hybrid BCI for BCI navigation are discussed in detail. | Haochen HU Yue LIU Kang YUE Yongtian WANG | 2022 | Virtual Reality & Intelligent Hardware2022，4，2： | 0 |
| 8 | Boosted high-temperature electrical characteristics of AlGaN/GaN HEMTs with rationally designed compositionally graded AlGaN back barriers显示文摘Wide bandgap GaN-based HEMTs have shown great potential as key components in various power electronic systems but still face challenges in the pursuit of devices with stable operation capability especially in harsh environments.Here,we report a high-performance double heterojunction(DH)based AlGaN/GaN HEMT by incorporating a decreasing-Al-composition(DAC)graded AlGaN back barrier(BB)beneath the GaN channel.Thanks to the improved electron confinement enabled by graded BB,the DHHEMT exhibits significantly improved on-state drain current density and off-state breakdown voltage compared with a single heterojunction(SH)based HEMT.More intriguingly,with an additional Si Nx passivation layer,the surface states of the DH-HEMTs can be effectively suppressed,leading to an almost constant offstate leakage current and negligible gate contact degradation across the temperature range from 25℃to 150℃.These results highlight the superiority and reliability of the proposed graded AlGaN BB to boost device characteristics for applications under high temperatures and harsh conditions. | Haochen ZHANG Yue SUN Kunpeng HU Lei YANG Kun LIANG Zhanyong XING Hu WANG Mingshuo ZHANG Huabin YU Shi FANG Yang KANG Haiding SUN | 2023 | Science China(Information Sciences)2023，66，8： | 0 |
| 9 | Observation of polarity-switchable photoconductivity in lInitride/MoS_(x)core-shell nanowires显示文摘Ⅱ-Ⅴsemiconductor nanowires are indispensable building blocks for nanoscale electronic and optoelectronic devices.However,solely relying on their intrinsic physical and material properties sometimes limits device functionalities to meet the increasing demands in versatile and complex electronic world.By leveraging the distinctive nature of the one-dimensional geometry and large surface-to-volume ratio of the nanowires,new properties can be attained through monolithic integration of conventional nanowires with other easy-synthesized functional materials.Herein,we combine high-crystal-quality lInitridle nanowires with amorphous molybdenum sulfides(a-MoS)to construct II.nitride/a-MoS_(x) core-shell nanostructures.Upon light ilumination,such nanostructures exhibit striking spectrally distinctive photodetection characteristic in photoelectrochemical environment,demonstrating a negative photoresponsivity of-100.42 mA W^(-1)under 254 nm ilumination,and a positive photoresponsivity of 29.5 mA W^(-1)under 365 nm ilumination.Density functional theory calculations reveal that the successful surface modifcation of the nanowires via a-MoS_(x)decoration accelerates the reaction process at the electrolyte/nanowire interface,leading to the generation of opposite photocurrent signals under different photon ilumination.Most importantly,such polarity-switchable photoconductivity can be further tuned for multiple wavelength bands photodetection by simply adjusting the surrounding environment and/or tailoring the nanowire composition,showing great promise to build light-wavelength controllable sensing devices in the future. | Danhao Wang Wentiao Wu Shi Fang Yang Kang Xiaoning Wang Wei Hu Huabin Yu Haochen Zhang Xin Lu Yuanmin Luo Jr-Hau He Lan Fu Shibing Long Sheng Liu Haiding Sun | 2022 | Light(Science & Applications)2022，11，11： | 0 |
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