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Continuous-wave operation of 1550 nm low-threshold triple-lattice photonic-crystal surface-emitting lasers

Light(Science & Applications) 2024年第3期13卷 446-453页

作者： ziye Wang Xia Liu Pinyao Wang Huanyu Lu Bo Meng Wei Zhang Lijie Wang Yanjing Wang Cunzhu Tong State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Central Research Institute Planning Dept 2012 LabsHuawei Technologies Company Ltd.Shenzhen 518129China

Benefitting from narrow beam divergence,photonic crystal surface-emitting lasers are expected to play an essential role in the ever-growing fields of optical communication and light detection and ranging.Lasers operating with 1.55μm wavelengths have attracted particular attention due to their minimum fiber loss and high eye-safe threshold.However,high interband absorption significantly decreases their performance at this 1.55μm wavelength.Therefore,stronger optical feedback is needed to reduce their threshold and thus improve the output power.Toward this goal,photonic-crystal resonators with deep holes and high dielectric contrast are often used.Nevertheless,the relevant techniques for high-contrast photonic crystals inevitably complicate fabrication and reduce the final yield.In this paper,we demonstrate the first continuous-wave operation of 1.55μm photonic-crystal surface-emitting lasers by using a‘triple-lattice photonic-crystal resonator’,which superimposes three lattice point groups to increase the strength of in-plane optical feedback.Using this geometry,the in-plane 180°coupling can be enhanced threefold compared to the normal single-lattice structure.Detailed theoretical and experimental investigations demonstrate the much lower threshold current density of this structure compared to‘single-lattice’and‘double-lattice’photonic-crystal resonators,verifying our design principles.Our findings provide a new strategy for photonic crystal laser miniaturization,which is crucial for realizing their use in future high-speed applications.

关键词： resonator crystal lattice

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CREDIT-X1local:A reference dataset for machine learning seismology from ChinArray in Southwest China

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Earthquake Science 2024年第2期37卷 139-157页

作者： Lu Li Weitao Wang ziye Yu Yini Chen Institute of Geophysics China Earthquake AdministrationBeijing 100081China Key Laboratory of Earthquake Source Physics China Earthquake AdministrationBeijing 100081China Zhejiang Earthquake Agency HangzhouZhejiang 310013China

High-quality datasets are critical for the development of advanced machine-learning algorithms in seismology.Here,we present an earthquake dataset based on the ChinArray Phase I records(X1).ChinArray Phase I was deployed in the southern north-south seismic zone(20°N-32°N,95°E-110°E)in 2011-2013 using 355 portable broadband seismic stations.CREDIT-X1local,the first release of the ChinArray Reference Earthquake Dataset for Innovative Techniques(CREDIT),includes comprehensive information for the 105,455 local events that occurred in the southern north-south seismic zone during array observation,incorporating them into a single HDF5 file.Original 100-Hz sampled three-component waveforms are organized by event for stations within epicenter distances of 1,000 km,and records of≥200 s are included for each waveform.Two types of phase labels are provided.The first includes manually picked labels for 5,999 events with magnitudes≥2.0,providing 66,507 Pg,42,310 Sg,12,823 Pn,and 546 Sn phases.The second contains automatically labeled phases for 105,442 events with magnitudes of−1.6 to 7.6.These phases were picked using a recurrent neural network phase picker and screened using the corresponding travel time curves,resulting in 1,179,808 Pg,884,281 Sg,176,089 Pn,and 22,986 Sn phases.Additionally,first-motion polarities are included for 31,273 Pg phases.The event and station locations are provided,so that deep learning networks for both conventional phase picking and phase association can be trained and validated.The CREDIT-X1local dataset is the first million-scale dataset constructed from a dense seismic array,which is designed to support various multi-station deep-learning methods,high-precision focal mechanism inversion,and seismic tomography studies.Additionally,owing to the high seismicity in the southern north-south seismic zone in China,this dataset has great potential for future scientific discoveries.

关键词： earthquake dataset machine learning Pg/Sg/Pn/Sn phase picking P-wave first-motion polarity

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A Sharding Scheme Based on Graph Partitioning Algorithm for Public Blockchain

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 3311-3327页

作者： Shujiang Xu ziye Wang Lianhai Wang Miodrag J.Mihaljevi′c Shuhui Zhang Wei Shao Qizheng Wang Key Laboratory of Computing Power Network and Information Security Ministry of EducationShandong Computer Science CenterQilu University of Technology(Shandong Academy of Sciences)Jinan250014China Shandong Provincial Key Laboratory of Computer Networks Shandong Fundamental Research Center for Computer ScienceJinan250014China Mathematical Institute The Serbian Academy of Sciences and ArtsBelgrade11000Serbia

Blockchain technology,with its attributes of decentralization,immutability,and traceability,has emerged as a powerful catalyst for enhancing traditional industries in terms of optimizing business processes.However,transaction performance and scalability has become the main challenges hindering the widespread adoption of blockchain.Due to its inability to meet the demands of high-frequency trading,blockchain cannot be adopted in many scenarios.To improve the transaction capacity,researchers have proposed some on-chain scaling technologies,including lightning networks,directed acyclic graph technology,state channels,and shardingmechanisms,inwhich sharding emerges as a potential scaling technology.Nevertheless,excessive cross-shard transactions and uneven shard workloads prevent the sharding mechanism from achieving the expected aim.This paper proposes a graphbased sharding scheme for public blockchain to efficiently balance the transaction distribution.Bymitigating crossshard transactions and evening-out workloads among shards,the scheme reduces transaction confirmation latency and enhances the transaction capacity of the blockchain.Therefore,the scheme can achieve a high-frequency transaction as well as a better blockchain scalability.Experiments results show that the scheme effectively reduces the cross-shard transaction ratio to a range of 35%-56%and significantly decreases the transaction confirmation latency to 6 s in a blockchain with no more than 25 shards.

关键词： Blockchain sharding graph partitioning algorithm

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Leucogranite mapping via convolutional recurrent neural networks and geochemical survey data in the Himalayan orogen

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Geoscience Frontiers 2024年第1期15卷 175-186页

作者： ziye Wang Tong Li Renguang Zuo State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China

Geochemical survey data analysis is recognized as an implemented and feasible way for lithological mapping to assist mineral exploration.With respect to available approaches,recent methodological advances have focused on deep learning algorithms which provide access to learn and extract information directly from geochemical survey data through multi-level networks and outputting end-to-end classification.Accordingly,this study developed a lithological mapping framework with the joint application of a convolutional neural network(CNN)and a long short-term memory(LSTM).The CNN-LSTM model is dominant in correlation extraction from CNN layers and coupling interaction learning from LSTM layers.This hybrid approach was demonstrated by mapping leucogranites in the Himalayan orogen based on stream sediment geochemical survey data,where the targeted leucogranite was expected to be potential resources of rare metals such as Li,Be,and W mineralization.Three comparative case studies were carried out from both visual and quantitative perspectives to illustrate the superiority of the proposed model.A guided spatial distribution map of leucogranites in the Himalayan orogen,divided into high-,moderate-,and low-potential areas,was delineated by the success rate curve,which further improves the efficiency for identifying unmapped leucogranites through geological mapping.In light of these results,this study provides an alternative solution for lithologic mapping using geochemical survey data at a regional scale and reduces the risk for decision making associated with mineral exploration.

关键词： Lithological mapping Deep learning Convolutional neural network Long short-term memory Leucogranites

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A Comparative Study of Chinese Translations of Tagore’s Stray Birds From the Perspective of the“Three Beauties Theory”

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Sino-US English Teaching 2024年第4期21卷 194-199页

作者： YANG ziye ZENG Shuang University of Shanghai for Science and Technology ShanghaiChina

For more than 60 years,Mr.Xu Yuanchong has been devoted to education.He has not only made remarkable achievements in translating from and into Chinese,English,French and other languages,but has also developed his own unique concept of translation.Since 1950,he has always adhered to the“Three Beauties Theory”,believing that translation should not only rely on the original text,but also realize the“beauty of meaning”,“beauty of sound”,and“beauty of form”.Based on Xu Yuanchong’s“Three Beauties Theory”,this paper takes Zheng Zhenduo’s and Feng Tang’s Chinese translations of Stray Birds as an example to explore in depth the specifics of poetry translation theory.The study summarizes the similarities and differences between these two translations in embodying the“three beauties”,providing insights into the Chinese translation techniques of philosophical prose poems.This endeavor seeks to offer valuable insights for the comparative study of Stray Birds translations。

关键词： “Three Beauties Theory” Stray Birds translation of Zheng Zhenduo translation of Feng Tang

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Address forms in Chinese audit opinions

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China Journal of Accounting Research 2014年第4期7卷 247-261页

作者： Ziye Zhao Institute of Accounting and Finance School of Accountancy Shanghai University of Finance and Economics

Although forms of address are widely used in textual and other types of disclosure,empirical evidence of their effects is rare.China provides a unique setting in which to test the economic consequences of the forms of address used in audit reports.From 2003 to 2011,about 60%of auditors surveyed addressed their clients by their real names in audit opinions,while the others used honorifics.Based on a sample of Chinese audit opinions,I report the following findings.First,the announcement of an audit opinion that uses the client’s real name elicits a greater market response than the announcement of an opinion featuring an honorific form of address.Second,the effects of real-name forms of address are stronger in firms with weak board governance.Third,the association between audit fees and audit risk factors,such as loss-making,is stronger in firms that are addressed by their real names in audit reports.I conclude from these findings that the forms of address used in audit opinions may reveal private information on audit quality.The results of this study are consistent with the power-solidarity effect described by sociolinguists.

关键词： Address forms Audit independence Power-solidarity effect Politeness principle

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“弦鼗”与“弦鼗之制”——对先唐中原琵琶史的还原阐释

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中国音乐学 2024年第1期 56-65页

作者：范子烨中国社会科学院文学研究所中国社会科学院大学文学院

鼗从三代开始进入礼乐系统。所谓“弦鼗”,最初的意义是在鼗上加弦,表现了魏晋时期国人对这种外来的鲁特属抱弹乐器的认识,至唐代弦鼗则成为一个专有的乐器名称。一切音乐史,都是精神史;一切精神史,都是思想史。本文所论“弦鼗”问题,... 详细信息

鼗从三代开始进入礼乐系统。所谓“弦鼗”,最初的意义是在鼗上加弦,表现了魏晋时期国人对这种外来的鲁特属抱弹乐器的认识,至唐代弦鼗则成为一个专有的乐器名称。一切音乐史,都是精神史;一切精神史,都是思想史。本文所论“弦鼗”问题,实际是从精神史和思想史的层面审视唐前琵琶史,由此而驱除了从古至今的纯粹乐器学层面阐释的种种分歧与困惑。“弦鼗”作为表述乐器之语,具有“单纯之深刻与深刻之单纯”的文化意味,它为前人的“格义”学说提供了又一个鲜活的例证。就中原和西域的音乐交流史而言,“弦鼗”乃是中原抱弹乐器的滥觞。在“胡人弦鼗之制”的实践历程中,“弦鼗”经历了以仿制为核心的秦琵琶阶段,以阴阳五行定制为核心的汉琵琶阶段和在汉文化观念驱动下的以五音十二律音阶表达为核心的魏晋琵琶即阮咸琵琶阶段。从魏晋时代开始,中原士人真正拥有了属于自己的成熟而完美的鲁特属抱弹乐器,这就是阮咸琵琶,华夏音乐史的华彩乐章由此翻开了新的一页。由此,积淀着秦风汉韵,浸染着魏晋品格的阮咸琵琶,广传于大江南北和长城内外,远至东瀛,近抵西域,一代风流美器之芳踪,留下了永恒的文化记忆。

关键词：鼗 “弦鼗” “弦鼗之制” 阮咸琵琶格义

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改进YOLOv8的航拍小目标检测方法:CRP-YOLO

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计算机工程与应用 2024年第13期60卷 209-218页

作者：赵志宏郝子晔石家庄铁道大学信息科学与技术学院石家庄050043 石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室石家庄050043

无人机航拍目标检测是近些年研究的热点,由于无人机航拍视角下的小目标图像及被遮挡情况严重,导致出现漏检、误检等问题。针对以上问题,提出了一种改进YOLOv8的航拍小目标检测方法:CRP-YOLO。为提升颈部网络PANet的特征提取能力,提出一... 详细信息

无人机航拍目标检测是近些年研究的热点,由于无人机航拍视角下的小目标图像及被遮挡情况严重,导致出现漏检、误检等问题。针对以上问题,提出了一种改进YOLOv8的航拍小目标检测方法:CRP-YOLO。为提升颈部网络PANet的特征提取能力,提出一种多分支部分空洞卷积结构,将RFB模块与PConv结合改进颈部网络的特征融合方式,增大颈部网络的感受野;在主干网络SPPF层前的C2f中引入CoT(contextual Transformer)结构改进Bottleneck块,利用全局上下文信息,提升网络特征提取能力;在检测层增加一个尺寸为160×160的小目标检测头,提高对小目标的检测能力。在公开数据集VisDrone2019上进行实验,结果表明,相较于基线模型YOLOv8s,CRP-YOLO在mAP@0.5上提升3.8个百分点,mAP@0.5:0.95提升1.7个百分点,参数量降低1.5 MB,与其他主流目标检测方法相比也得到较好的检测性能。

关键词：小目标检测 YOLOv8s 感受野模块(RFB) CoT

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不同渗漏位置下管道渗蚀物理模型试验及细观机理研究

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浙江大学学报（工学版） 2024年第6期58卷 1209-1220页

作者：王子业谭勇龙莹莹同济大学土木工程学院上海200092

针对管道渗漏诱发的地面塌陷问题,采用级配均匀的福建标准砂,研究管道不同渗漏位置对水土流失发展规律的影响.利用离散元与有限差分耦合(DEM-FDM)的方法在细观层面对管道渗漏进行模拟,探究管道不同渗漏位置对地层应力以及渗流侵蚀发展... 详细信息

针对管道渗漏诱发的地面塌陷问题,采用级配均匀的福建标准砂,研究管道不同渗漏位置对水土流失发展规律的影响.利用离散元与有限差分耦合(DEM-FDM)的方法在细观层面对管道渗漏进行模拟,探究管道不同渗漏位置对地层应力以及渗流侵蚀发展的影响,分析渗漏前后管道所受水、土压力的变化以及土拱的发展情况.试验及数据模拟研究结果表明:1)管道渗漏会经历初步渗漏、渗漏发展、渗漏收敛3个阶段.2)管道腰部发生渗漏会对地层造成更大的扰动并受到更为强烈的渗流侵蚀作用,诱发更为严重的地面塌陷.3)管道发生渗漏后,管道表面渗漏处受到的土压力会减小,而管道表面渗漏处周围所受到的土压力会增加,但其受到的水土合力基本保持不变.4)管道不同位置发生渗漏时,管道表面土压力的发展是不同的:顶部发生渗漏,管道表面渗漏处周围土压力逐渐减小;腰部发生渗漏,管道表面不同位置处的土压力则分别展现出增加、减小以及不变3种趋势.

关键词：管道渗漏渗漏位置渗流侵蚀 DEM-FDM 土拱

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基于十水硫酸钠的个体防护材料的制备及性能

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材料导报 2024年第3期38卷 48-52页

作者：赵荣韩子夜吴飞翔刘太奇李谭秋北京石油化工学院环境材料研究中心北京102617 中国航天科研训练中心北京100094

新冠病毒的爆发使得人们对医用防护服的性能提出了更高的要求:隔离病毒并确保密闭空间人体舒适。人们试图用基于十水硫酸钠的相变材料来调节个体防护服的温度,但是其配方中含有危险品硼酸,并存在相分离、过冷等现象,限制了其实际应用。... 详细信息

新冠病毒的爆发使得人们对医用防护服的性能提出了更高的要求:隔离病毒并确保密闭空间人体舒适。人们试图用基于十水硫酸钠的相变材料来调节个体防护服的温度,但是其配方中含有危险品硼酸,并存在相分离、过冷等现象,限制了其实际应用。采用纳米二氧化硅和硼砂两种不同类型的成核剂,成功制备出不含硼酸的过冷度低、热性能稳定、可用于调节人体温度的个体防护材料,并研究了用DSC测试该材料相变潜热的方法。实验结果表明,纳米二氧化硅有效降低了十水硫酸钠的过冷度,个体防护材料的潜热足以用于制造防护服。当纳米二氧化硅添加量为3%时,个体防护材料的潜热为179 J/g,相变温度为16℃,过冷度仅为0.7℃;DSC测试该防护材料热性能的最佳条件为:样品质量为30 mg,制样温度维持在0℃,氮气压力为0.1 MPa。使用该防护材料制备的个体防护背心测试结果表明:防护背心4 h内可保持在26℃范围中,6 h保持在29℃范围内。

关键词：十水硫酸钠个体防护相变材料成核剂二氧化硅

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