检索结果-南通市图书馆

Particuology 2024年第2期85卷 268-279页

作者： Yong liu Chongyang He Cong Wang Lei Chen songlin liu Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei230031China University of Science and Technology of China Hefei230027China Chengdu University Chengdu610106China Zhejiang Lab Hangzhou310000China

This paper presents the study of the dynamic characteristics of confined mixed pebble beds with different friction under different vibration conditions using the discrete element ***λsegre-gation index is used to quantify the degree of particle mixing or *** percolation,convection and diffusion mechanisms are responsible for the segregation patterns of the mixed *** results show the degree of segregation can be suppressed by decreasing the vibration acceleration or free space height below a *** simulation reveals the threshold of vibration acceleration or free space height both are related to the bed height increment which determines the strength of the percolation *** addition,the strength of percolation and convection becomes weaker by decreasing the friction of particles and walls,which makes the pebbled bed remains in a mixed state under *** findings are significant to clarify the main factors behind the three segregation mechanisms and hence provide solutions to retaining the mixed state of the Li2TiO3&Be12Ti mixed pebble bed.

关键词： Vibration Segregation Binary pebble bed Discrete element method

Physics-informed optimization for a data-driven approach in landslide susceptibility evaluation

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

Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3192-3205页

作者： songlin liu Luqi Wang Wengang Zhang Weixin Sun Yunhao Wang Jianping liu School of Civil Engineering Chongqing UniversityChongqing400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityMinistry of EducationChongqing400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing400045China Chongqing Field Scientific Observation Station for Landslide Hazards in Three Gorges Reservoir Area Chongqing UniversityChongqing400045China Chongqing Mingfeng Construction Engineering Co. LtdChongqing405800China

Landslide susceptibility mapping is an integral part of geological hazard ***,the emphasis of many studies has been on data-driven models,notably those derived from machine learning,owing to their aptitude for tackling complex non-linear ***,the prevailing models often disregard qualitative research,leading to limited interpretability and mistakes in extracting negative samples,*** non-landslide *** this study,Scoops 3D(a three-dimensional slope stability analysis tool)was utilized to conduct a qualitative assessment of slope stability in the Yunyang section of the Three Gorges Reservoir *** depth of the bedrock was predicted utilizing a Convolutional Neural Network(CNN),incorporating local boreholes and building on the insights from prior *** Random Forest(RF)algorithm was subsequently used to execute a data-driven landslide susceptibility *** proposed methodology demonstrated a notable increase of 29.25%in the evaluation metric,the area under the receiver operating characteristic curve(ROC-AUC),outperforming the prevailing benchmark ***,the landslide susceptibility map generated by the proposed model demonstrated superior *** result not only validates the effectiveness of amalgamating mathematical and mechanistic insights for such analyses,but it also carries substantial academic and practical implications.

关键词： Physics-informed Machine learning Bedrock depth Scoops 3D Landslide susceptibility

Machine learning solution for regional landslide susceptibility based on fault zone division strategy

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

Journal of Mountain Science 2024年第5期21卷 1745-1760页

作者： WANG Yunhao WANG Luqi liu songlin SUN Weixin liu Pengfei ZHU Lin YANG Wenyu GUO Tong School of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityMinistry of EducationChongqing 400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing 400045China Institute of Geological Environment Monitoring Chongqing 401147China Chongqing 205 Geological Team Chongqing 401121China

Landslide susceptibility assessment is an essential tool for disaster prevention and management. In areas with multiple fault zones, the impact of fault zone on slope stability cannot be disregarded. This study performed qualitative analysis of fault zones and proposed a zoning method to assess the landslide susceptibility in Chengkou County, Chongqing Municipality, China. The region within a distance of 1 km from the faults was designated as sub-zone A, while the remaining area was labeled as sub-zone B. To accomplish the assessment, a dataset comprising 388 historical landslides and 388 non-landslide points was used to train the random forest model. 10-fold cross-validation was utilized to select the training and testing datasets for the model. The results of the models were analyzed and discussed, with a focus on model performance and prediction uncertainty. By implementing the proposed division strategy based on fault zone, the accuracy, precision, recall, F-score, and AUC of both two sub-zones surpassed those of the whole region. In comparison to the results obtained for the whole region, sub-zone B exhibited an increase in AUC by 6.15%, while sub-zone A demonstrated a corresponding increase of 1.66%. Moreover, the results of 100 random realizations indicated that the division strategy has little effect on the prediction uncertainty. This study introduces a novel approach to enhance the prediction accuracy of the landslide susceptibility mapping model in areas with multiple fault zones.

关键词： Landslide susceptibility mapping Fault division strategy Random forest GIS

Preliminary electromagnetic analysis of the COOL blanket for CFETR

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2024年第1期26卷 101-108页

作者：鲁帅领马学斌刘松林 School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China

The supercritical CO_(2)cOoled Lithium-Lead(COOL)blanket has been designed as one advanced blanket candidate for the Chinese Fusion Engineering Test Reactor(CFETR).This work focuses on the electromagnetic(EM)loads(Maxwell force and Lorentz force)acting on the COOL blanket,which are important mechanical loads in further structural analysis of the COOL blanket.A 3D electromagnetic analysis is performed using the ANSYS finite element method to obtain EM loads on the COOL blanket in this *** first,the magnetic scalar potential(MSP)method is used to obtain the magnetic field and the Maxwell force on the COOL ***,the magnetic vector potential(MVP)method is performed during a plasma disruption event to get the eddy current *** last,a multi-step method is adopted for the calculation of the Lorentz force and the *** maximum Lorentz forces of inboard and outboard blanket structural components are 5624 kN and 2360 kN respectively.

关键词： CFETR COOL blanket finite element analysis electromagnetic analysis

基于模型定义的光学遥感卫星星上处理系统设计

在线全文

学校读者我要写书评

暂无评论

测绘学报 2024年第4期53卷 689-699页

作者：刘薇刘松林郭子博刘凯张荔哲智慧地球重点实验室北京100029 西安测绘研究所陕西西安710054 西安电子科技大学陕西西安710071 中国空间技术研究院西安分院陕西西安710000

本文提出了一种基于模型定义的光学遥感卫星星上处理系统设计方法,构建了“硬件资源-算子模块-通用处理核-典型应用”的星上处理任务行为模型范式。在硬件层面,采用星上异构嵌入式计算平台,将多处理器一体化设计,通过标准化高速数据互连... 详细信息

本文提出了一种基于模型定义的光学遥感卫星星上处理系统设计方法,构建了“硬件资源-算子模块-通用处理核-典型应用”的星上处理任务行为模型范式。在硬件层面,采用星上异构嵌入式计算平台,将多处理器一体化设计,通过标准化高速数据互连,完成高速信号传输和数据处理;通过网络拓扑实现良好的扩展性,支持设备规模及数据处理复杂性的变化;在软件层面,针对星上智能处理任务中频繁数据读写操作、大量重复计算操作、卷积神经网络的通用计算与加速等需求,设计了星上平台指令集、星上算法通用算子和星上智能网络组件组成的可配置算子模块,并基于该模块可快速实现特定算法的硬件IP核。经仿真试验验证,本文方法可根据卫星平台和星上处理任务需求,按需适配最佳软硬件解决方案,并有效提高了计算资源利用率;提出的结合云检测的实时流水压缩编码方案,显著提升了压缩性能;设计的轻量化目标检测识别方法,计算资源效率达到91.5%;以高分一号、高分七号原始数据率为例进行分析,相比常规方案整体计算资源利用率分别提高了16.51%、17.77%。实现了星上处理系统研制过程模型化、工作模式可定义、逻辑资源共享化,是适应卫星小型化、快速部署的一种合理优化选择。

关键词：遥感卫星星上处理模型定义按需适配异构计算

维普期刊数据库博看期刊

“第二个结合”的精神实质在毛泽东思想中的体现

在线全文

学校读者我要写书评

暂无评论

江苏社会科学 2024年第4期 41-51,I0002,I0003页

作者：张允熠刘松璘上海师范大学上海师范大学马克思主义学院

毛泽东作为马克思主义中国化的伟大开拓者,创造性地提出了“第二个结合”的原初形态。“第一个结合”蕴含着“第二个结合”的思想元素,“第二个结合”是“第一个结合”的精神内核和深层动力。毛泽东开拓性地阐释了中国共产党的马克思主... 详细信息

毛泽东作为马克思主义中国化的伟大开拓者,创造性地提出了“第二个结合”的原初形态。“第一个结合”蕴含着“第二个结合”的思想元素,“第二个结合”是“第一个结合”的精神内核和深层动力。毛泽东开拓性地阐释了中国共产党的马克思主义观、传统文化观、中西文化观等基本观点,科学回答了如何对待马克思主义、中华优秀传统文化、外来文化的问题,为“第二个结合”核心观念的凝练奠定了基础。毛泽东提出了马克思主义中国化的伟大成就是“三大法宝”,“三大法宝”理论是毛泽东思想的重要组成部分,也无疑是“两个结合”的思想成果,体现了“第二个结合”的精神实质。阐发毛泽东思想中蕴含的“第二个结合”的原初形态和核心观点,有助于回溯中国共产党人一脉相承的文化心路,有助于进一步深刻阐释、深入领会习近平文化思想。

关键词：毛泽东思想 “第一个结合” “第二个结合” “三大法宝”

同方期刊数据库

扬州地区汉墓出土原始瓷器工艺品质及相关问题探析

在线全文

学校读者我要写书评

暂无评论

中原文物 2024年第3期 102-111页

作者：刘松林颜张奕扬州市文物考古研究所江苏扬州225009 南京博物院江苏南京210016

扬州地区汉墓出土了大量的原始瓷器,推测是通过水运贸易来源于越文化核心区浙江一带,处于商周原始瓷与成熟瓷器之间,其工艺品质在西汉至东汉初有所差异。西汉早期原始瓷工艺品质相对较好,随葬原始瓷墓主身份偏高。西汉中晚期,尤其是西... 详细信息

扬州地区汉墓出土了大量的原始瓷器,推测是通过水运贸易来源于越文化核心区浙江一带,处于商周原始瓷与成熟瓷器之间,其工艺品质在西汉至东汉初有所差异。西汉早期原始瓷工艺品质相对较好,随葬原始瓷墓主身份偏高。西汉中晚期,尤其是西汉晚期原始瓷发展达到高峰,数量、规模均超前期,工艺品质却至最低点,多数器物胎质较粗、疏松,胎釉结合度差,剥釉现象严重,部分器物仅剩釉痕。器型规整度相对较差,烧制变形现象较为普遍。仅有少数器物工艺品质相对较好。墓主身份上达王侯将相,下至普通平民,且与原始瓷工艺品质相对应。东汉初未有太大变化。该区汉墓原始瓷器工艺品质差异形成原因应与当时社会背景、自然资源、工艺技术条件及墓主身份等因素有关。

关键词：扬州地区汉墓原始瓷工艺品质

在线全文

学校读者我要写书评

暂无评论

深中沉管隧道火灾烟气流动与控制数值研究

消防科学与技术 2024年第8期43卷 1091-1099页

作者：王亮张海宁刘松林重庆大学煤矿灾害动力学与控制全国重点实验室重庆400044

为了研究采用横向联络排烟道结合侧壁排烟口新型排烟方式对沉管隧道火灾烟气流动的控制效果,以深圳-中山隧道为例,采用理论分析与计算流体力学相结合的方法,通过分析临界风速、烟气逆流长度和烟气分岔低温区域来研究烟气的流动特性。提... 详细信息

为了研究采用横向联络排烟道结合侧壁排烟口新型排烟方式对沉管隧道火灾烟气流动的控制效果,以深圳-中山隧道为例,采用理论分析与计算流体力学相结合的方法,通过分析临界风速、烟气逆流长度和烟气分岔低温区域来研究烟气的流动特性。提出了沉管隧道火灾临界风速和烟气逆流长度的修正模型,同时还建立了烟气分岔流动低温区域长度的预测模型。结果表明,当无量纲热释放率小于0.139时,临界风速与无量纲火源热释放速率的1/3次方成正比。当纵向风速从1.5 m/s增加到4.0 m/s时,10、20、30、50 MW火灾时的峰值温度分别降低了35%、48%、46%和43%。在强纵向风速的作用下会发生烟气分岔现象,对隧道中心线和侧壁温度进行分析,得到了分岔流动低温区域长度预测模型,预测结果误差在10%以内。

关键词：沉管隧道火灾数值模拟临界风速烟气逆流长度烟气分岔

基于UPLC-Q-TOF-MS/MS的疏肝和胃汤化学成分、HPLC指纹图谱、化学模式识别及含量测定研究

在线全文

学校读者我要写书评

暂无评论

中草药 2024年第7期55卷 2183-2196页

作者：袁传裕胡俊杰李娟刘焱文刘松林陈新湖北中医药大学中药资源与中药化学湖北省重点实验室湖北武汉430065

目的指认疏肝和胃汤(Shugan Hewei Decoction,SHD)主要化学成分,建立其HPLC指纹图谱,并结合化学模式识别评价其质量,同时确定9种成分含量测定方法。方法通过UPLC-Q-TOF-MS/MS对SHD中化学成分进行分析;HPLC建立SHD指纹图谱及含量测定方法... 详细信息

目的指认疏肝和胃汤(Shugan Hewei Decoction,SHD)主要化学成分,建立其HPLC指纹图谱,并结合化学模式识别评价其质量,同时确定9种成分含量测定方法。方法通过UPLC-Q-TOF-MS/MS对SHD中化学成分进行分析;HPLC建立SHD指纹图谱及含量测定方法;采用中药色谱指纹图谱相似度评价软件(2012年版),结合层次聚类分析(hierarchical cluster analysis,CA)、主成分分析(principal component analysis,PCA)与正交偏最小二乘法-判别分析(orthogonal partial least squares-discriminant analysis,OPLS-DA),寻找影响SHD质量的主要化学成分。结果从SHD中共鉴定出88个成分,包括26个黄酮类成分、27个萜类成分、18个生物碱类成分、6个香豆素类成分、6个有机酸类成分、2个苯丙素类化合物、3个其他类成分;建立了SHD的HPLC指纹图谱,确定了20个共有峰,10批样品相似度0.972~1.000。3种化学模式识别均将样品分为2类,造成主要差异的质量差异物来源于槲皮苷。建立的多成分含量测定方法耐用性良好。结论UPLC-Q-TOFMS/MS定性鉴别结合HPLC指纹图谱,可以体现SHD组分的整体特征,为其质量控制研究奠定基础。

关键词：疏肝和胃汤 HPLC-MS 裂解规律指纹图谱橘皮素黄藤素白术内酯Ⅲ 甘草酸层次聚类分析主成分分析正交偏最小二乘化法-判别分析

在线全文

学校读者我要写书评

暂无评论

考虑能效的园区综合能源系统运行优化策略

电工技术 2024年第14期 47-52页

作者：柳松林梁材国网山东省电力公司东明县供电公司

为分析能源利用效率对综合能源系统运行的影响，提出了一种考虑能效的多目标运行优化策略。首先，在典型园区综合能源系统的基础上，构建了冷热电联供的综合能源系统模型。然后，提出能效用以量化综合能源系统的能源利用水平。接着，以... 详细信息

为分析能源利用效率对综合能源系统运行的影响，提出了一种考虑能效的多目标运行优化策略。首先，在典型园区综合能源系统的基础上，构建了冷热电联供的综合能源系统模型。然后，提出能效用以量化综合能源系统的能源利用水平。接着，以综合能源系统运行经济性和能效为优化目标，通过最大化加权隶属度函数把多目标模型转化为单目标模型求解。最后，选取华北某综合能源示范园区作为算例验证所提运行优化策略的有效性。

关键词：综合能源系统冷热电联供能源利用运行优化