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An improved non-uniform fast Fourier transform method for radio imaging of coronal mass ejections

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Astronomical Techniques and Instruments 2024年第2期1卷 117-127页

作者： Weidan Zhang bing Wang zhao Wu Shuwang Chang Yao Chen Fabao Yan Laboratory for Electromagnetic Detection Institute of Space SciencesShandong UniversityWeihaiWeihai 264209China Center for Integrated Research on Space Science Astronomyand PhysicsInstitute of Frontier and Interdisciplinary ScienceShandong UniversityQingdaoQingdao 266237China School of Mechanical Electrical&Information EngineeringShandong UniversityWeihaiWeihai 264209China

Radioheliographs can obtain solar images at high temporal and spatial resolution,with a high dynamic range.These are among the most important instruments for studying solar radio bursts,understanding solar eruption events,and conducting space weather forecasting.This study aims to explore the effective use of radioheliographs for solar observations,specifically for imaging coronal mass ejections(CME),to track their evolution and provide space weather warnings.We have developed an imaging simulation program based on the principle of aperture synthesis imaging,covering the entire data processing flow from antenna configuration to dirty map generation.For grid processing,we propose an improved non-uniform fast Fourier transform(NUFFT)method to provide superior image quality.Using simulated imaging of radio coronal mass ejections,we provide practical recommendations for the performance of radioheliographs.This study provides important support for the validation and calibration of radioheliograph data processing,and is expected to profoundly enhance our understanding of solar activities.

关键词： Radio interference Gridding Imaging Non-uniform fast Fourier transform

A compact multi-pixel superconducting nanowire single-photon detector array supporting gigabit space-to-ground communications

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Light(Science & Applications) 2024年第2期13卷 254-266页

作者： Hao Hao Qing-Yuan zhao Yang-Hui Huang Jie Deng Fan Yang Sai-Ying Ru Zhen Liu Chao Wan Hao Liu Zhi-Jian Li Hua-bing Wang Xue-Cou Tu La-Bao Zhang Xiao-Qing Jia Xing-Long Wu Jian Chen Lin Kang Pei-Heng Wu Research Institute of Superconductor Electronics(RISE) School of Electronic Science and EngineeringNanjing UniversityNanjingJiangsu 210023China Purple Mountain Laboratories NanjingJiangsu 211111China Hefei National Laboratory HefeiAnhui 230088China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210023China

Classical and quantum space-to-ground communications necessitate highly sensitive receivers capable of extracting information from modulated photons to extend the communication distance from near-earth orbits to deep space explorations.To achieve gigabit data rates while mitigating strong background noise photons and beam drift in a highly attenuated free-space channel,a comprehensive design of a multi-functional detector is indispensable.In this study,we present an innovative compact multi-pixel superconducting nanowire single-photon detector array that integrates near-unity detection efficiency(91.6%),high photon counting rate(1.61 Gcps),large dynamic range for resolving different photon numbers(1-24),and four-quadrant position sensing function all within one device.Furthermore,we have constructed a communication testbed to validate the advantages offered by such an architecture.Through 8-PPM(pulse position modulation)format communication experiments,we have achieved an impressive maximum data rate of 1.5 Gbps,demonstrating sensitivities surpassing previous benchmarks at respective speeds.By incorporating photon number information into error correction codes,the receiver can tolerate maximum background noise levels equivalent to 0.8 photons/slot at a data rate of 120 Mbps—showcasing a great potential for daylight operation scenarios.Additionally,preliminary beam tracking tests were conducted through open-loop scanning techniques,which revealed clear quantitative dependence indicating sensitivity variations based on beam location.Based on the device characterizations and communication results,we anticipate that this device architecture,along with its corresponding signal processing and coding techniques,will be applicable in future space-to-ground communication tasks.

关键词： photon supporting correction

Design and fabrication of r-hirudin loaded dissolving microneedle patch for minimally invasive and long-term treatment of thromboembolic disease

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Asian Journal of Pharmaceutical Sciences 2022年第2期17卷 284-297页

作者： Mengfang Wu Tian Xia Yaran Li Tianfa Wang Shijia Yang Jinchao Yu Qiaoyan Liang Teng Shen Min Yu bing zhao Key Laboratory of Metabolism and Molecular Medicine Ministry of EducationFudan UniversityShanghai 200032China The Department of Biochemistry and Molecular Biology School of Basic Medical SciencesFudan UniversityShanghai 200032China Key Laboratory of Smart Drug Delivery Ministry of EducationDepartment of PharmaceuticsSchool of PharmacyFudan UniversityShanghai 201203China

Cardiovascular disease is the leading cause of global mortality,with anticoagulant therapy being the main prevention and treatment strategy.Recombinant hirudin(r-hirudin)is a direct thrombin inhibitor that can potentially prevent thrombosis via subcutaneous(SC)and intravenous(IV)administration,but there is a risk of haemorrhage via SC and IV.Thus,microneedle(MN)provides painless and sanitary alternatives to syringes and oral administration.However,the current technological process for the micro mould is complicated and expensive.The micro mould obtained via three-dimensional(3D)printing is expected to save time and cost,as well as provide a diverse range of MNs.Therefore,we explored a method for MNs array model production based on 3D printing and translate it to micro mould that can be used for fabrication of dissolving MNs patch.The results show that r-hirudin-loaded and hyaluronic acid(HA)-based MNs can achieve transdermal drug delivery and exhibit significant potential in the prevention of thromboembolic disease without bleeding in animal models.These results indicate that based on 3D printing technology,MNs combined with r-hirudin are expected to achieve diverse customizableMNs and thus realize personalized transdermal anticoagulant delivery for minimally invasive and long-term treatment of thrombotic disease.

关键词： Anticoagulant r-hirudin Microneedle patch 3D printing technology

某金矿氰化尾渣氧化焙烧无害化处置及机理研究

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东北大学学报（自然科学版） 2024年第2期45卷 262-269页

作者：宋岩赵冰李艳军赵羚伯东北大学资源与土木工程学院辽宁沈阳110819 东北大学难采选铁矿资源高效开发利用技术国家地方联合工程研究中心辽宁沈阳110819

针对某金矿氰化尾渣络合氰化物占比极高的特点,采用氧化焙烧工艺处理氰化尾渣.试验结果表明,将氰化尾渣样品在焙烧温度550℃,焙烧时间30 min,O_(2)体积分数20%,总气量600 mL/min条件下进行氧化焙烧试验,可将氰化尾渣中的总氰化物含量降... 详细信息

针对某金矿氰化尾渣络合氰化物占比极高的特点,采用氧化焙烧工艺处理氰化尾渣.试验结果表明,将氰化尾渣样品在焙烧温度550℃,焙烧时间30 min,O_(2)体积分数20%,总气量600 mL/min条件下进行氧化焙烧试验,可将氰化尾渣中的总氰化物含量降至检出限0.04 mg/kg以下,同时硫元素保留率达到82.22%.针对相应的铁氰络合物K_(4)Fe(CN)_(6)进行热重分析,结果表明K4Fe(CN)_(6)首先被氧化为KCNO,进而氧化为K_(2)CO_(3),两阶段均伴随有CO_(2),CO,NO_(2),NO等气态产物生成,且第一阶段伴随有副反应发生.该工艺不仅可以将氰化尾渣中的氰化物特别是络合氰化物有效分解,同时可保证尾渣中硫元素不易被氧化,大幅减少后续烟气脱硫成本,具有广泛的应用前景.

关键词：氰化尾渣焙烧络合氰化物氧化分解无害化处置

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Cryogenian and Ediacaran integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 919-949页

作者： Lang SUN Malik Muhammad Saud Sajid KHAN Chuan YANG Zhixin SUN bing PAN Shehryar AHMED Lanyun MIAO Weichen SUN Chunlin HU Xiaojuan SUN Cui LUO Bo CHEN Zongjun YIN Fangchen zhao Guoxiang LI Maoyan ZHU State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

The complex evolutionary history of the Qinghai-Tibetan Plateau and its surrounding areas,including the continental blocks(Indian,Lhasa,South Qiangtang,Tarim,Olongbuluk,Central Qilian,Alxa,North China,Yangtze,Central Iran and Oman)and the orogenic belts between them,has long been the frontier in Earth science research.The Cryogenian and Ediacaran strata are extensively distributed in these blocks.Specifically,relatively complete Cryogenian and Ediacaran successions have been discovered in Oman,Indian,Yangtze,and Tarim blocks,while only the Ediacaran successions have been reported in Iran,the South Qiangtang,Central Qilian,Alxa,and North China blocks.Based on previous studies together with the integration of new materials and advancement obtained through the Second Tibetan Plateau Scientific Expedition and Research,this review aims to synthesize a correlative stratigraphic framework of the representative Cryogenian and Ediacaran sequences from the Qinghai-Tibetan Plateau and its surrounding areas.Furthermore,the Cryogenian and Ediacaran biotas and major geological events in these areas are comprehensively discussed in aspects of current research status.The results indicate that,in general,Ediacaran fossils of each area exhibit distinct features in preservation and assemblage composition,but the typical late Ediacaran fossils Cloudina and Shaanxilithes have been reported from most of these areas.In addition to the two global Cryogenian glaciations,late Ediacaran glaciogenic deposits are extensively recorded in the areas within and around the northern QinghaiTibetan Plateau(including the North China,Alxa,Central Qilian,Olongbuluk,and Tarim blocks,and the North Qilian Accretionary Belt),as well as central and southern Iran.However,further research is required to determine the age,distribution,and origin of these late Ediacaran glaciogenic deposits.Meanwhile,the middle Ediacaran DOUNCE/Shuram Excursion is widely documented in the Qinghai-Tibetan Plateau and its surrounding areas.The available data show that,after the

关键词： Qinghai-Tibetan Plateau Cryogenian Ediacaran Stratigraphy Palaeogeography Biota Gondwana

中国未破裂颅内动脉瘤临床管理指南(2024版)解读

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中华医学杂志 2024年第21期104卷 1903-1906页

作者：赵兵刘清源王硕上海交通大学医学院附属仁济医院神经外科上海首都医科大学附属北京天坛医院神经外科北京

随着脑血管影像技术的普及, 未破裂颅内动脉瘤(UIA)临床检出率越来越高。UIA破裂风险低, 但是一旦破裂, 严重影响人类健康。UIA治疗存在较大争议, 引起临床广泛关注。中华医学会神经外科学分会、中国卒中学会脑血管外科分会、国家神经... 详细信息

随着脑血管影像技术的普及, 未破裂颅内动脉瘤(UIA)临床检出率越来越高。UIA破裂风险低, 但是一旦破裂, 严重影响人类健康。UIA治疗存在较大争议, 引起临床广泛关注。中华医学会神经外科学分会、中国卒中学会脑血管外科分会、国家神经系统疾病医学中心与国家神经系统疾病临床研究中心联合制订《中国未破裂颅内动脉瘤临床管理指南(2024版)》, 该指南采用模块化形式, 突出推荐意见, 并指出当前研究不足及未来研究方向, 从UIA流行病学、人群筛查、临床影像诊断、破裂风险评估、治疗决策及选择, 术后随访及长期管理等方面提供了全面的临床管理意见。将证据来源分为中国人群和其他人群, 有助于指导国内临床实践。

关键词：颅内动脉瘤指南破裂风险治疗临床管理

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数字阅读基础设施:元概念、方法论与意义场

编辑之友 2024年第6期 31-38页

作者：赵立兵西南政法大学新闻传播学院重庆401120

作为当代阅读活动的外部环境与底层结构,数字阅读基础设施不仅涵盖互联网硬件设备、设施与物理环境,还包括数字平台的数据、程序及规范体系,且指向诸多阅读行动者间的互动互构关系。文章以基础设施倒置的研究方法,揭示出数字媒介平台并... 详细信息

作为当代阅读活动的外部环境与底层结构,数字阅读基础设施不仅涵盖互联网硬件设备、设施与物理环境,还包括数字平台的数据、程序及规范体系,且指向诸多阅读行动者间的互动互构关系。文章以基础设施倒置的研究方法,揭示出数字媒介平台并非被动、中立且不可见的实践背景,其蕴藏的能动性深刻影响着阅读意义的生成模式、象征机制与时空结构,重塑了作者、读者、文本、介质等要素之间的构序法则。同时,作为数字阅读基础设施的意义冗余,其潜在的信息超载、过度联结、“信息茧房”等负面效应,将给人类知识生产的独立性与创新性带来巨大风险。如何克服数字阅读的“熵增”现象,开启知识创新的“负熵”进程,是阅读研究必须回应的时代之问。

关键词：数字阅读阅读实践知识基础设施基础设施转向活力物质主义

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数智赋能国家安全教育现代化的概念、内涵与机制

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现代教育技术 2024年第5期34卷 45-52页

作者：王秉赵桉中南大学资源与安全工程学院湖南长沙410083 中南大学安全理论创新与促进研究中心湖南长沙410083

国家安全教育现代化是国家安全体系和能力现代化的重要组成部分,是筑牢国家安全人民防线的关键之所在。在数智时代,数智赋能是推进国家安全教育现代化的应有之义和必由之路。在此背景下,文章阐释了数智赋能国家安全教育现代化的概念,并... 详细信息

国家安全教育现代化是国家安全体系和能力现代化的重要组成部分,是筑牢国家安全人民防线的关键之所在。在数智时代,数智赋能是推进国家安全教育现代化的应有之义和必由之路。在此背景下,文章阐释了数智赋能国家安全教育现代化的概念,并从国家安全教育的方式变革、进程推动、体系构建、内容更新、教育普及五个方面分析了数智赋能国家安全教育现代化的内涵。此外,文章还从理论框架和实现路径两个维度,揭示了数智赋能国家安全教育现代化的机制。文章指出,数智赋能国家安全教育现代化是指国家安全教育借助数智赋能实现数智化国家安全教育的过程,其理论框架由数智技术、国家安全教育数据智能、数智化国家安全教育场景三大模块组成,其实现路径是数智赋能国家安全教育精准化、智能化、协同化、动态化。文章对于数智赋能国家安全教育现代化的研究,可为数智赋能国家安全教育现代化的落地落实提供理论基础与方法指导,并为推进国家安全教育现代化提供思路参考。

关键词：国家安全数智赋能教育现代化国家安全教育国家安全素养

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Magnetic and magnetocaloric effect of Er_(20)Ho_(20)Dy_(20)Cu_(20)Ni_(20)high-entropy metallic glass

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Chinese Physics B 2024年第5期33卷 602-606页

作者：于世霖田路王俊峰赵新国李达莫兆军李昺 Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China and School of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang 110016China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China

Er_(20)Ho_(20)Dy_(20)Cu_(20)Ni_(20)high-entropy metallic glass exhibited excellent magnetic refrigeration material with a wide temperature range and high refrigeration capacity(RC)was reported.Er_(20)Ho_(20)Dy_(20)Cu_(20)Ni_(20)high-entropy metallic glass was observed with typical spin glass behavior around 15.5 K.In addition,we find that the magnetic entropy change(-△S_(M))originates from the sample undergoing a ferromagnetic(FM)to paramagnetic(PM)transition around 20 K.Under a field change from 0 T to 7 T,the value of maximum magnetic entropy change(-△S_(M)^(max))reaches 12.5 J/kg·K,and the corresponding value of RC reaches 487.7 J/kg in the temperature range from 6 K to 60 K.The large RC and wide temperature range make the Er_(20)Ho_(20)Dy_(20)Cu_(20)Ni_(20)high-entropy metallic glass be a promising material for application in magnetic refrigerators.

关键词： magnetic materials magnetocaloric effect high-entropy metallic glass magnetic refrigeration large refrigeration capacity