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Pleistocene glaciation advances the cryptic speciation of Stellera chamaejasme *** a major biodiversity hotspot

Journal of Integrative Plant Biology 2024年第6期66卷 1192-1205页

作者： Santosh Kumar Rana Hum Kala Rana Jacob BLandis Tianhui Kuang juntong chen Hengchang Wang Tao Deng Charles C.Davis Hang Sun CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Arkansas Biosciences Institute Arkansas State UniversityJonesboroArkansas 72401USA School of Integrative Plant Science Section of Plant Biology and the L.H.Bailey HortoriumCornell UniversityIthacaNew York 14853USA BTI Computational Biology Center Boyce Thompson InstituteIthacaNew York 14853USA CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Chinese Academy of SciencesWuhan Botanical GardenWuhan 430074China Department of Organismic and Evolutionary Biology HerbariaHarvard UniversityCambridgeMassachusetts 02138USA

The mountains of Southwest China comprise a significant large mountain range and biodiversity hotspot imperiled by global climate *** high species diversity in this mountain system has long been attributed to a complex set of factors,and recent large-scale macroevolutionary investigations have placed a broad timeline on plant diversification that stretches from 10 million years ago(Mya)to the *** our increasing understanding of the temporal mode of speciation,finer-scale populationlevel investigations are lacking to better refine these temporal trends and illuminate the abiotic and biotic influences of cryptic *** is largely due to the dearth of organismal sampling among closely related species and populations,spanning the incredible size and topological heterogeneity of this *** study dives into these evolutionary dynamics of speciation using genomic and ecomorphological data of Stellera chamaejasme *** identified four previously unrecognized cryptic species having indistinct morphological traits and large metapopulation of evolving lineages,suggesting a more recent diversification(~2.67-0.90 Mya),largely influenced by Pleistocene glaciation and biotic *** factors likely influenced allopatric speciation and advocated cyclical warming–cooling episodes along elevational gradients during the *** study refines the evolutionary timeline to be much younger than previously implicated and raises the concern that projected future warming may influence the alpine species diversity,necessitating increased conservation efforts.

关键词： cryptic speciation glacial-interglacial Hengduan Mountains north-south migration Stellera chamaejasme

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Crawler Vehicle Rescue Robot Based on Arduino NANO

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Journal of Electronic Research and Application 2024年第4期8卷 143-147页

作者： Haiwei Wang juntong chen Tianyu Jin College of Civil Engineering and Transportation Northeast Forestry UniversityHarbin 150040China

This paper introduces the Arduino NANO-based crawler vehicle rescue robot,including the traveling *** traveling device includes an electrical screw jack,a power mechanism,a power supply,a camera,a curved snow shovel,a lighting device,and a control *** control circuit is connected to the power supply,camera,lighting device,power unit,and electrical screw *** beneficial effect is that the control circuit can accurately control the height of the jack to ensure an effective rescue,power the rescue device and electronics,and effectively improve the efficiency of rescue.

关键词： Image recognition Traffic safety Travel security

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中国两种紫堇属植物新记录——中尼黄堇和厚叶紫堇

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植物科学学报 2024年第3期42卷 275-281页

作者：杨舜铨陈俊通邓涛李志敏云南师范大学生命科学学院昆明650500 中国科学院昆明植物研究所植物多样性与特色经济作物全国重点实验室昆明650201

在对2018年采自西藏自治区的高山冰缘带紫堇属(Corydalis)植物的标本进行鉴定时,发现两个中国新记录种——中尼黄堇(*** Prain)和厚叶紫堇(*** Royle),本文根据标本首次提供了物种详细的中文形态描述和彩色照片。中尼黄堇与角状黄堇(***... 详细信息

在对2018年采自西藏自治区的高山冰缘带紫堇属(Corydalis)植物的标本进行鉴定时,发现两个中国新记录种——中尼黄堇(*** Prain)和厚叶紫堇(*** Royle),本文根据标本首次提供了物种详细的中文形态描述和彩色照片。中尼黄堇与角状黄堇(*** Royle)在形态上较为相似,主要区别在于中尼黄堇茎纤细;外花瓣龙骨状突起的先端部位具暗紫红色斑块或无;上花瓣的瓣片宽展,3裂,具极矮的鸡冠状突起;距平直,圆筒状,与花瓣片近等长;下花瓣近菱形,先端骤缩为短尖头;柱头方形,具10个乳突。厚叶紫堇在形态上与囊果紫堇(*** Ludlow)相似,区别在于其具有不同的叶形及叶裂、总状花序、不增粗果梗。此次新发现丰富了西藏紫堇属植物的物种多样性,为紫堇属植物的区系研究和资源开发提供了新的数据资料。

关键词：中尼黄堇厚叶紫堇中国新记录罂粟科

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A survey of in-spin transfer torque MRAM computing

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Science China(Information Sciences) 2021年第6期64卷 30-44页

作者： Hao CAI Bo LIU juntong chen Lirida NAVINER Yongliang ZHOU Zhen WANG Jun YANG National ASIC System Engineering Research Center Southeast University Laboratoire Traitement et Communication de l'Information Télécom Paris Nanjing Prochip Electronic Technology Co. Ltd.

In traditional von Neumann computing architectures, the essential transfer of data between the processor and memory hierarchies limits the computational efficiency of next-generation *** emerging in-memory computing(IMC) approach addresses this issue and facilitates the movement of significant data and rapid computations. Among the different memory types, intrinsic energy efficiency is demonstrated by in-magnetic random access memory(MRAM) computing with a low-power spintronic magnetic tunnel junction device and hybrid integration at an advanced complementary metal-oxide semiconductor node. This study reviews state-of-the-art techniques for managing IMC with an emphasis on spin-transfer torque-MRAM computing via design schemes at the bit-cell, circuit, and system levels. In addition, this study presents effective design techniques and potential challenges and demonstrates the existing limitations of in-MRAM computing and potential methods for overcoming these issues. This study also considers the design technology co-optimization from the IMC perspective.

关键词： spin-transfer torque-magnetoresistive random access memory in-memory computing magnetic tunnel junction analog computing nonvolatile memory Boolean logic neural network

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基于改进的GoogleNet-ResNet算法的路基病害智能分类方法

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计算机测量与控制 2024年第8期32卷 250-256,294页

作者：陈登峰杨小燕张温何拓航陈俊彤西安建筑科技大学建筑设备科学与工程学院西安710000 西安建筑科技大学管理学院西安710000 西安建筑科技大学公共管理学院西安710000

针对路基病害分类算法存在的复杂病害辨识难度大、多视图雷达图像特征利用不充分等问题,提出一种基于改进的GoogleNet-ResNet算法的路基病害智能分类方法;首先,引入坐标注意力和改进的Inception模块对GoogleNet网络结构进行优化;然后,... 详细信息

针对路基病害分类算法存在的复杂病害辨识难度大、多视图雷达图像特征利用不充分等问题,提出一种基于改进的GoogleNet-ResNet算法的路基病害智能分类方法;首先,引入坐标注意力和改进的Inception模块对GoogleNet网络结构进行优化;然后,利用改进的GoogleNet学习c-scan数据特征剔除非目标病害,实现病害目标的粗分类;最后,将分类成病害的b-scan数据输入基于迁移学习的ResNet50,实现病害的细分类;实验表明,改进的GoogleNet进行病害粗分类的准确率可达到98.2%,检测速度可达90.9 fps;基于迁移学习的ResNet50进行病害细分类的准确率可达90.5%,检测速度可达52.6 fps;该算法的准确率比单独的改进的GoogleNet网络高10.1%,比单独的ResNet50网络高7.4%,有效地提高了道路路基病害的识别精度与效率。

关键词：道路工程路基病害识别级联神经网络多视图雷达图像三维探地雷达

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新疆3种维管植物新记录

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中国野生植物资源 2024年第6期43卷 113-117页

作者：郭绍宇曲上陈俊通周可柔尚策北京林业大学生态与自然保护学院北京100083 中国科学院昆明植物研究所东亚植物多样性与生物地理学重点实验室云南昆明650201

报道了1个中国维管植物新记录种—波叶菊(Chrysanthemum sinuatum Ledeb.),2个新疆维管植物新记录种—刺果茶藨子(Ribes burejense Fr. Schmidt.)、赛北紫堇[Corydalis impatiens (Pall.) Fisch.]。根据标本和野外观察对3个新记录种进行了形态描述,并提供了部分形态特征和生境照片。该报道丰富了新疆地区维管植物多样性,为该地区的植物保护以及物种编目提供了基础数据。

关键词：维管植物新记录额尔齐斯河流域新疆

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A facile strategy for large-scale production of 2D nanosheets exfoliated by three-roll milling

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Journal of Advanced Ceramics 2024年第1期13卷 11-18页

作者： Xin Wang Yang Xia juntong Huang Yao Su Zhi chen Linlin chen Zhaohui Wu Zhijun Feng Huiyong Yang Xibao Li School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

Two-dimensional(2D)nanomaterials,such as graphene,MoS_(2),and MAX,have attracted increasing research attention in recent years due to their unique structural and performance ***,their complex production processes and equipment requirements are significant issues affecting their widespread ***,with an exfoliation strategy using three-roll milling,we present a simple,cost-effective,and extensible method to produce multilayer graphene,BN,MoS_(2),and Ti_(3)AlC_(2) *** roller and phenolic resin created three kinds of forces on the layered 2D materials,i.e.,shear forces,compressive forces,and adhesive forces,which exfoliated layered materials from their edges and surfaces into ***,the exfoliated materials were ultrasonically washed with alcohol,treated with ultrasonic vibration,and centrifuged to obtain 2D *** easy operation and high yield are attractive for research based on the construction of high-performance 2D nanosheet-based devices at low ***,the obtained multilayer graphene and MoS_(2) nanosheets were used as anode materials of sodium/potassium-ion batteries,respectively,to test their electrochemical *** performances are obtained compared with their primary bulk materials.

关键词： two-dimensional(2D)nanosheets exfoliation three-roll milling(TRM) sodium/potassium-ion batteries

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Photoelectrocatalytic hydrogen evolution and synchronous degradation of organic pollutants by pg-C_(3)N_(4)/β-FeOOH S-scheme heterojunction

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Science China(Technological Sciences) 2024年第4期67卷 1238-1252页

作者： LI XiBao HAN Tao ZHOU YingTang XIE Yu LUO YiDan HUANG juntong chen Zhi DENG Fang School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China National-Local Joint Engineering Research Center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316022China

Crafting photoelectrocatalytic materials with robust oxidation-reduction properties for simultaneous hydrogen evolution and pollutant degradation poses a formidable *** this study,a pg-C_(3)N_(4)/β-FeOOH S-scheme heterostructure with a special energy band structure was developed by anchoring porous pg-C_(3)N_(4)on needle shapedβ-*** as a hole extraction layer,needle-leaf-likeβ-FeOOH can facilitate efficient hole migration and enhance charge ***,the optimized 0.2-pg-C_(3)N_(4)/β-FeOOH could degrade 78%of ofloxacin(OFLO)in 90 *** organic pollutants could absorb a large number of holes,which prompted a greater proportion of photogenerated electrons to actively participate in the hydrogen evolution reaction at the ***,the hydrogen production of 0.2-pg-C_(3)N_(4)/β-FeOOH reached 1452.88μmol cm^(-2)h^(-1),exhibiting a notable increase of 61.81-165.12μmol cm^(-2)h^(-1)compared with that in the absence of *** and theoretical calculation results underscore that this investigation is grounded in a distinctive electron and hole dual channel transfer *** findings offer novel insights for the future development of S-scheme heterojunction photoelectrocatalytic materials capable of concurrently degrading pollutants and promoting hydrogen evolution.

关键词： photoelectrocatalysis hydrogen evolution degradation synchronous S-scheme heterojunction

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Distributed phase-matching measurement for dynamic strain and temperature sensing based on stimulated Brillouin scattering enhanced four-wave mixing

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Photonics Research 2024年第1期12卷 141-153页

作者： YUAN WANG PEDRO TOVAR juntong YANG LIANG chen XIAOYI BAO Nexus for Quantum Technologies University of OttawaOttawaOntario K1N 6N5Canada

A Brillouin dynamic grating(BDG) can be used for distributed birefringence measurement in optical fibers,offering high sensitivity and spatial resolution for sensing ***,it is quite a challenge to simultaneously achieve dynamic measurements with both high accuracy and high spatial *** this work,we propose a sensing mechanism to achieve distributed phase-matching measurement using a chirped pulse as a probe *** BDG reflection,the peak reflection corresponds to the highest four-wave mixing(FWM) conversion efficiency,and it requires the Brillouin frequency in the fast and slow axes to be equal,which is called the phase-matching *** condition changes at different fiber positions,which requires a range of frequency injection for the probe *** proposed method uses a chirped pulse as a probe wave to cover this frequency range associated with distributed birefringence *** allows us to detect distributed phase matching for birefringence changes that are introduced by temperature and strain *** to the single shot and direct time delay measurement capability,the acquisition rate in our system is only limited by the fiber ***,unlike conventional BDG spectrum recovery-based systems,the spatial resolution here is determined by both the frequency chirping rate of the probe pulse and the birefringence profile of the *** the experiments,an acquisition rate of 1 k Hz(up to fiber length limits) and a spatial resolution of 10 cm using a 20 ns probe pulse width are *** minimum detectable temperature and strain variation are 5.6 mK and 0.37 με along a 2 km long polarization-maintaining fiber(PMF).

关键词： fiber scattering polarization

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直播场景下旅游凝视行为研究

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旅游学刊 2021年第10期36卷 49-61页

作者：陈俊彤殷平北京交通大学经济管理学院北京100044

旅游直播以其特有的互动性、体验性和实时性已经成为凝视目的地的重要方式之一,在其场景下的旅游凝视行为发生了改变。文章以"带着微博去旅行"的128场直播和25.4万字的弹幕文本作为基础资料,运用内容分析法研究了旅游直播凝视的目的、... 详细信息

旅游直播以其特有的互动性、体验性和实时性已经成为凝视目的地的重要方式之一,在其场景下的旅游凝视行为发生了改变。文章以"带着微博去旅行"的128场直播和25.4万字的弹幕文本作为基础资料,运用内容分析法研究了旅游直播凝视的目的、内容、态度和权力关系,构建了旅游直播凝视行为过程模型。研究结果表明:(1)旅游直播凝视目的从单一的追求愉悦体验扩充为审视目的地、粉丝行为和获取福利,凝视内容为主播、旅游环境、旅游吸引物、优惠活动和直播相关信息。(2)弹幕实时互动是主播与潜在游客的双向凝视,潜在游客在互动中掌握主动权,但主播通过反向凝视获取了信息。(3)主播在旅游直播中扮演了专家、当地人、导游和游客多重角色,使主播与潜在游客的权力关系呈现动态变化。(4)旅游直播凝视使潜在游客实现对目的地的先视,产生偏积极的情感倾向,重构了地方形象。研究结论丰富并推进了旅游凝视理论,并为旅游直播实践发展提供理论支撑。

关键词：旅游直播旅游凝视媒体化凝视内容分析

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