检索结果-南通市图书馆

UltraStar:A Lightweight Simulator of Ultra-Dense LEO Satellite Constellation Networking for 6G

IEEE/CAA Journal of Automatica Sinica 2023年第3期10卷 632-645页

作者： Xiaoyu Liu Ting Ma Zhixuan Tang xiaohan qin Haibo Zhou Xuemin(Sherman)Shen School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China Department of Electrical and Computer Engineering University of WaterlooWaterloo N2L 3G1Canada IEEE

The mega-constellation network has gained significant attention recently due to its great potential in providing ubiquitous and high-capacity connectivity in sixth-generation(6G)wireless communication systems.However,the high dynamics of network topology and large scale of mega-constellation pose new challenges to the constellation simulation and performance evaluation.In this paper,we introduce UltraStar,a lightweight network simulator,which aims to facilitate the complicated simulation for the emerging mega-constellation of unprecedented scale.Particularly,a systematic and extensible architecture is proposed,where the joint requirement for network simulation,quantitative evaluation,data statistics and visualization is fully considered.For characterizing the network,we make lightweight abstractions of physical entities and models,which contain basic representatives of networking nodes,structures and protocol stacks.Then,to consider the high dynamics of Walker constellations,we give a two-stage topology maintenance method for constellation initialization and orbit prediction.Further,based on the discrete event simulation(DES)theory,a new set of discrete events is specifically designed for basic network processes,so as to maintain network state changes over time.Finally,taking the first-generation Starlink of 11927 low earth orbit(LEO)satellites as an example,we use UltraStar to fully evaluate its network performance for different deployment stages,such as characteristics of constellation topology,performance of end-to-end service and effects of network-wide traffic interaction.The simulation results not only demonstrate its superior performance,but also verify the effectiveness of UltraStar.

关键词： Discrete event simulation(DES) mega-constellation network dynamics performance evaluation simulation architecture design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cybertwin-Assisted Mode Selection in Ultra-Dense LEO Integrated Satellite-Terrestrial Network

引用

Journal of Communications and Information Networks 2022年第4期7卷 360-374页

作者： Xin Zhang Bo Qian xiaohan qin Ting Ma Jiachen Chen Haibo Zhou Xuemin(Sherman)Shen School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China Laboratory Shenzhen 518000China Department of Electrical and Computer Engineering University of WaterlooWaterlooON N2L 3G1Canada

Ultra-dense low earth orbit(LEO)integrated satellite-terrestrial network(ULISTN)has become an emerging paradigm to support massive access of Internet of things(IoT)in beyond fifth generation mobile networks(B5G).In ULISTN,there are two communication modes:cellular mode and satellite mode,where IoT users assessing terrestrial small base stations(TSBSs)and terrestrial-satellite terminals(TSTs)respectively.However,how to optimize the network performance and guarantee self-interests of the operator and IoT users in ULISTN is a challenging issue.In this paper,we propose a cybertwin-assisted joint mode selection and dynamic pricing(JMSDP)scheme for effective network management in ULISTN,where cybertwin serves as the intelligent agent.In JMSDP,the operator determines optimal access prices of TSBSs and TSTs,while each user selects the access mode according to access prices.Specifically,the operator conducts the Stackelberg game aiming at maximizing average throughput depending on the mode selection results of IoT users.Meanwhile,IoT users as followers adopt the evolutionary game to choose an access mode based on the access prices provided by the operator.Simulation results show that the proposed JMSDP can improve the average throughput and reduce the delay effectively,comparing with random access(RA)and maximum rate access.

关键词： ULISTN massive IoT cybertwin mode selection dynamic pricing game theory

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Distribution of chromophytic phytoplankton in the Western Subarctic Gyre of Pacific Ocean revealed by morphological observation and rbc L gene sequences

引用

Journal of Oceanology and Limnology 2023年第6期41卷 2166-2179页

作者： Tao JIANG xiaohan qin Guannan WU Huaxian ZHAO Xiaotao YU Xueyan XIAO Wenjing LIU qingjing HU Jufa CHEN Nan LI School of Ocean Yantai UniversityYantai 264005China Key Laboratory of Sustainable Development of Marine Fisheries Ministry of AgricultureYellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf Guangxi Key Laboratory of Earth Surface Processes and Intelligent SimulationNanning Normal UniversityNanning 530001China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China School of Medicine Yunnan UniversityKunming 650091China College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China

Western Subarctic Gyre(WSG),which possesses distinctive differences in oceanographic and biogeochemical processes,is situated in the northwest subarctic Pacific.The WSG is characterized by high nutrient and low chlorophyll.We carried out a field investigation in this area in summer 2020 and performed microscopic observation,cytometric counting,and RuBisCO large subunit(rbc L)gene analysis to understand the community structure and spatial distribution of chromophytic phytoplankton better.Microscopic method revealed that total phytoplankton(>10μm,including Bacillariophyta,Dinoflagellata,Ochrophyta,and Chlorophyta)abundances ranged(0.6×10^(3))-(167.4×10^(3))cells/L with an increasing trend from south to north.Dinoflagellates and Pennatae diatoms dominated the phytoplankton assemblages in the southern and northern stations,respectively.Major chromophytic phytoplankton groups derived from rbc L genes included Haptophyta,Ochrophyta,Bacillariophyta,as well as rarely occurring groups,such as Xanthophyta,Cyanobacteria,Dinoflagellata,Rhodophyta,and Cryptophyta.At the phylum level,Haptophyta was the most abundant phylum,accounting for approximately 30.80%of the total obtained operational taxonomic units in all samples.Ochrophyta and Bacillariophyta were the second and third most abundant phylum,and their relative abundance was 20.26% and 19.60%,respectively.Further,redundancy analysis showed that high proportion of diatoms(e.g.,microscopic and rbc L methods)was positively correlated with nutrients(e.g.,dissolved inorganic nitrogen(DIN),dissolved inorganic phosphorous,and dissolved silicate(DSi))and negatively correlated with temperature and salinity.The proportion of Ochrophyta,Rhodophyta,and Cyanobateria identified by rbc L genes was positively correlated with salinity and temperature and showed negative correlation to nutrients.This work is the first molecular study of phytoplankton accomplished in the WSG,and our results show some discrepancies between morphological observation and rbc L gene sequences,which highlight th

关键词： flow cytometry microscopic counting phytoplankton rbc L Western Subarctic Gyre

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

放疗前SII、PNI和LDH对放射性肺炎的预测价值

引用

徐州医科大学学报 2024年第4期44卷 279-284页

作者：杨娟秦小涵郭雯雯丁云鹤吴小进徐州医科大学附属徐州市立医院放疗科江苏徐州221000

目的探究放疗前外周血系统免疫炎症指数(SII)、预后营养指数(PNI)、乳酸脱氢酶(LDH)对胸部肿瘤患者发生放射性肺炎(RP)的预测价值及发生≥2级RP的影响因素。方法回顾性分析2021年7月—2022年12月于徐州市第一人民医院行调强适形放疗的... 详细信息

目的探究放疗前外周血系统免疫炎症指数(SII)、预后营养指数(PNI)、乳酸脱氢酶(LDH)对胸部肿瘤患者发生放射性肺炎(RP)的预测价值及发生≥2级RP的影响因素。方法回顾性分析2021年7月—2022年12月于徐州市第一人民医院行调强适形放疗的115例胸部肿瘤患者的相关资料。根据RP的发生情况,将患者分为RP组(27例)与非RP组(88例)。采用logistic回归分析胸部肿瘤患者放疗后发生RP的影响因素,并采用受试者工作特征(ROC)曲线评价放疗前SII对RP发生的预测作用。结果 ≥2级RP发生率为23.48%(27/115,2级15例,3级9例,4级3例)。单因素分析显示,2组患者在吸烟史、同步放化疗、免疫治疗、V20及放疗前SII水平上差异具有统计学意义(P1,P<0.05)。ROC曲线表明,放疗前SII水平预测RP发生的阈值为1 107.46,敏感度为0.704,特异度为0.659。结论胸部肿瘤患者吸烟史、免疫治疗、V20及放疗前SII水平均为发生RP的独立危险因素,且放疗前SII水平对RP发生具有一定的预测价值。

关键词：系统免疫炎症指数预后营养指数乳酸脱氢酶胸部肿瘤放射性肺炎调强适形放疗

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Perilipin 5 regulates hepatic stellate cell activation and high-fat diet-induced non-alcoholic fatty liver disease

引用

Animal Models and Experimental Medicine 2024年第2期7卷 166-178页

作者： Xuecui Yin Lin Dong xiaohan Wang Zhenzhen qin Yuying Ma Xiaofei Ke Ya Li qingde Wang Yang Mi Quanjun Lyu Xia Xu Pengyuan Zheng Youcai Tang Department of Internal Medicine the Fifth Affiliated Hospital of Zhengzhou UniversityZhengzhouChina Department of Pediatrics the Fifth Affiliated Hospital of Zhengzhou UniversityZhengzhouChina Department of Clinical Nutrition the First Affiliated Hospital of Zhengzhou UniversityZhengzhouChina Key Laboratory of Advanced Drug Preparation Technologies Ministry of Education of ChinaCo-innovation Center of Henan Province for New drug R&D and Preclinical SafetySchool of Pharmaceutical SciencesZhengzhou UniversityZhengzhouChina Department of Pediatrics GastroenterologyHenan Key Laboratory of Rehabilitation MedicineHenan Joint International Research Laboratory of Chronic Liver Injury and Henan Provincial Outstanding Overseas Scientists Chronic Liver Injury Studiothe Fifth Affiliated Hospital of Zhengzhou UniversityZhengzhouChina

Background:Nonalcoholic fatty liver disease(NAFLD)is one of the most common chronic liver diseases globally.Hepatic stellate cells(HSCs)are the major effector cells of liver fibrosis.HSCs contain abundant lipid droplets(LDs)in their cytoplasm during quiescence.Perilipin 5(PLIN 5)is a LD surface-associated protein that plays a crucial role in lipid homeostasis.However,little is known about the role of PLIN 5 in HSC activation.Methods:PLIN 5 was overexpressed in HSCs of Sprague–Dawley rats by lentivirus transfection.At the same time,PLIN 5 gene knockout mice were constructed and fed with a high-fat diet(HFD)for 20 weeks to study the role of PLIN 5 in NAFLD.The corresponding reagent kits were used to measure TG,GSH,Caspase 3 activity,ATP level,and mitochondrial DNA copy number.Metabolomic analysis of mice liver tissue metabolism was performed based on UPLC-MS/MS.AMPK,mitochondrial function,cell proliferation,and apoptosis-related genes and proteins were detected by western blotting and qPCR.Results:Overexpression of PLIN 5 in activated HSCs led to a decrease in ATP levels in mitochondria,inhibition of cell proliferation,and a significant increase in cell apoptosis through AMPK activation.In addition,compared with the HFD-fed C57BL/6J mice,PLIN 5 knockout mice fed with HFD showed reduced liver fat deposition,decreased LD abundance and size,and reduced liver fibrosis.Conclusion:These findings highlight the unique regulatory role of PLIN 5 in HSCs and the role of PLIN 5 in the fibrosis process of NAFLD.

关键词： AMPK apoptosis hepatic stellate cell liver fibrosis perilipin 5

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Natural long-chain saturated fatty acids doped LNPs enabling spleen selective mRNA translation and potent cancer immunotherapy

引用

Nano Research 2024年第3期17卷 1804-1817页

作者： Fazhan Wang Meng Zhang Meiling Tian Jia Lou Longze Pan Xiaoke Gao Lijing Zhang xiaohan Lou Linyu Zhu Yuqiao Sheng Ming Wang Rui Xue Wenjing Deng Shuai Shao Zhihai qin Medical Research Center The First Affiliated Hospital of Zhengzhou UniversityZhengzhou UniversityZhengzhou 450052China Translational Medical Center The First Affiliated Hospital of Zhengzhou UniversityZhengzhou UniversityZhengzhou 450052China Department of Neuro-Intensive Care Unit The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052China Academy of Medical Sciences Zhengzhou UniversityZhengzhou 450052China

Rationally tailored lipid nanoparticles(LNPs)with efficient and tunable delivery of mRNA in vivo are crucial for mRNA vaccines.Selective expression of antigenic protein in lymphoid tissues/organs could improve the immunostimulatory efficacy and safety of LNPs-based mRNA vaccines.Inspired by the metabolic behavior that long-chain saturated fatty acids tending to enter lymphoid tissue rather than the liver,we developed fatty acid-doped LNPs capable of mediating differential protein expressions in the liver and spleen when administered intravenously.When the molar ratio of saturated fatty acid located 60%–70%,the doped LNPs achieved the spleen selective mRNA translation.The mechanism could be attributed to the different cellular uptake behaviors of saturated fatty acids in hepatocytes.Immunization with a model antigen(ovalbumin)mRNA-loaded spleen selective LNPs,we observed enhanced antigen-specific T cell immune responses,and potent immunotherapeutic and immunoprophylactic efficacy in the mouse lymphoma model.Our natural long-chain saturated fatty acids metabolic characteristics-inspired design of LNPs for spleen-selective mRNA vaccines delivery will provide references for designing mRNA vaccines with high efficacy and safety for tumor immunotherapy.

关键词： mRNA vaccine lipid nanoparticles spleen long-chain saturated fatty acid cancer immunotherapy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

功能性便秘患者临床症状和结直肠肛门功能检查分型的一致性研究

引用

中国全科医学 2023年第12期26卷 1491-1495页

作者：秦肖含张佩彦王玉珍河北省人民医院消化内科河北省石家庄市050051

背景目前功能性便秘(FC)常依靠患者的临床症状进行分型指导治疗,但依据临床症状的分型结果与结直肠肛门功能检查的分型结果是否一致尚不明确。目的探究FC患者临床症状与结直肠肛门功能检查分型的一致性。方法本研究为回顾性研究。在2018... 详细信息

背景目前功能性便秘(FC)常依靠患者的临床症状进行分型指导治疗,但依据临床症状的分型结果与结直肠肛门功能检查的分型结果是否一致尚不明确。目的探究FC患者临床症状与结直肠肛门功能检查分型的一致性。方法本研究为回顾性研究。在2018年1月至2021年8月就诊于河北省人民医院消化内科的FC患者(含门诊及住院)中选取40例完成结直肠肛门功能检查的患者为研究对象。采用调查问卷的形式询问患者症状(包括每周自发排便次数、Bristol粪便性状量表分型、排便费力、排便时肛门直肠堵塞感、需要手法辅助排便、排便不尽感的频度和程度),并依此判断其临床症状分型。结直肠肛门功能检查包括肛门直肠压力测定(ARM)检查、排粪造影、胃肠传输时间(GITT)检查。比较患者临床症状分型和结直肠肛门功能检查分型的一致性。结果40例FC患者临床症状分型结果:结肠慢传输型便秘(STC)、排便障碍型便秘、混合型便秘分别占27.5%(11/40)、20.0%(8/40)、37.5%(15/40),正常传输型便秘(NTC)占15.0%(6/40)。ARM检查分型结果示,80.0%(32/40)的患者为排便障碍型便秘,20.0%(8/40)的患者为NTC。排粪造影分型结果示,67.5%(27/40)的患者为排便障碍型便秘,32.5%(13/40)的患者为NTC。GITT检查分型结果示,20.0%(8/40)的患者为STC,15.0%(6/40)的患者为排便障碍型便秘,65.0%(26/40)的患者为NTC。加权Kappa检验结果显示,临床症状分型与ARM检查、排粪造影、GITT检查分型结果无一致性(Kappa值=-0.123,P=0.502;Kappa值=-0.040,P=0.794;Kappa值=-0.140,P=0.215)。临床症状分型与结直肠肛门功能检查分型结果无一致性(Kappa值=-0.005,P=0.944)。结论FC患者临床表现以混合型便秘症状为主,而客观检查中以排便障碍型便秘为主。FC患者的临床症状与结肛门直肠功能检查分型之间存在差异。因此,在FC诊断中,需要将症状和客观检查分型相结合,且需要个体化分析。

关键词：便秘功能性便秘肛门直肠测压排粪造影结肠传输时间诊断鉴别

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

速度素质对女子十米跳台比赛成绩的影响

引用

体育科技文献通报 2022年第7期30卷 97-99页

作者：秦小涵曲阜师范大学体育科学学院山东曲阜273165

面对突如其来的新冠肺炎疫情,原定于2020年举办的东京奥运会,推迟到了2021年举办。奥运会是一场举世瞩目的盛会,各个国家都异常重视各位运动员在奥运会中的表现。在女子十米跳台的比赛中,中国队选手全红婵和陈芋汐分别斩获金银两枚奖牌... 详细信息

面对突如其来的新冠肺炎疫情,原定于2020年举办的东京奥运会,推迟到了2021年举办。奥运会是一场举世瞩目的盛会,各个国家都异常重视各位运动员在奥运会中的表现。在女子十米跳台的比赛中,中国队选手全红婵和陈芋汐分别斩获金银两枚奖牌。在运动员素质方面,速度素质是决定运动员成绩好坏与否的一大重要因素,速度素质主要分为反应速度、动作速度、位移速度三方面,在女子十米跳台比赛中主要关注运动员的动作速度。本文通过录像观察法、文献资料法等研究方法,对2020东京奥运会女子十米跳台决赛的首轮和末轮为例进行分析,得出速度素质对比赛成绩的相关影响:速度素质对于空中动作优美呈现正相关关系;速度素质影响入水角度;速度素质影响最终成绩。本文研究结果可给各训练团队提供相关参考,为运动员跳水训练提供借鉴。

关键词：奥运会女子十米跳台速度素质比赛成绩

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

据出土文献说“言”“谳”同源兼及郭店简《六德》“狱■”的释读

引用

出土文献 2024年第2期 39-48,170页

作者：刘晓晗清华大学人文学院

上博六《景公疟》简4“听狱”,传世文献异文作“治言”。邬可晶先生指出“言”读为“谳”,表狱讼义。本文在此基础上,从语音、字用和语义方面详细论证了“言”“谳”应该是一组同源词。“言”从“言语”义引申出“讼”义,“谳”应是战... 详细信息

上博六《景公疟》简4“听狱”,传世文献异文作“治言”。邬可晶先生指出“言”读为“谳”,表狱讼义。本文在此基础上,从语音、字用和语义方面详细论证了“言”“谳”应该是一组同源词。“言”从“言语”义引申出“讼”义,“谳”应是战国秦汉时期从“言”分化而来的。“谳”继承了“言”从下言上的核心语义,但其整体语义域比“言”缩小很多,是一个专用于司法刑狱的综合性动词。“言”“谳”亦可以从动词引申为表示动作关联的对象名词“狱讼”。本文还讨论了郭店简《六德》中的“狱■”,认为“狱■”当读为“狱彦(言—谳)”。

关键词：言谳同源词综合性动词六德

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

水稻根系和土壤性状与稻田甲烷排放关系的研究进展

引用

中国水稻科学 2024年第3期38卷 233-245页

作者：陈浩田秦缘钟笑涵林晨语秦竞航杨建昌张伟杨扬州大学农学院/江苏省作物遗传生理重点实验室/江苏省作物栽培生理重点实验室江苏扬州225009 扬州大学/江苏省粮食作物现代产业技术协同创新中心江苏扬州225009

甲烷(CH_(4))是大气中最主要的温室气体,对全球气候变暖具有重要影响。稻田是农业生态系统中CH_(4)的主要排放源,水稻根系与土壤是影响稻田CH_(4)排放的关键因素。因此,探究水稻根系和土壤性状与稻田CH_(4)排放的关系对于缓解温室效应... 详细信息

甲烷(CH_(4))是大气中最主要的温室气体,对全球气候变暖具有重要影响。稻田是农业生态系统中CH_(4)的主要排放源,水稻根系与土壤是影响稻田CH_(4)排放的关键因素。因此,探究水稻根系和土壤性状与稻田CH_(4)排放的关系对于缓解温室效应具有重要的意义。本文综述了稻田CH_(4)产生和排放的机理及其与水稻根系和土壤性状间的内在关系,并展望了进一步探究水稻和土壤性状与稻田CH_(4)排放关系的研究方向,为实现水稻丰产与固碳减排协同提供参考。

关键词：水稻根系特征土壤性状甲烷排放

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：