检索结果-南通市图书馆

Enhancing transboundary natural tourism resources governance:unveiling the spatial pattern and its influencing factors

引用

Journal of Mountain Science 2024年第3期21卷 973-986页

作者： zhang shengrui zhang Tongyan JU Hongrun WANG Yingjie Management College Ocean University of ChinaQingdao 266100China School of Tourism and Geography Science Qingdao UniversityQingdao 266071China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

Tourism resources that span provincial boundaries in China play a pivotal role in regional development,yet effective governance poses persistent *** study addresses this issue by constructing a comprehensive database of transboundary natural tourism resources(TNTR)through amalgamation of diverse data *** the Getis-Ord Gi^(*),kernel density estimation,and geographical detectors,we scrutinize the spatial patterns of TNTR,focusing on both named and unnamed entities,while exploring the influencing *** findings reveal 7883 identified TNTR in China,with mountain tourism resources emerging as the predominant *** provinces,Hunan boasts the highest count,while Shanghai exhibits the *** China demonstrates a pronounced clustering trend in TNTR distribution,with the spatial arrangement of biological landscapes appearing more random compared to geological and water *** China,characterized by intricate terrain,exhibits fewer TNTR,concurrently unveiling a significant presence of unnamed natural tourism ***,administrative segmentation influences TNTR development,generating disparities in regional goals,developmental stages and intensities,and management *** response to these variations,we advocate for strengthening the naming of the unnamed transboundary tourism resources,constructing a geographic database of TNTR for government and establishing a collaborative management mechanism based on TNTR *** research contributes to elucidating the intricate landscape of TNTR,offering insights for tailored governance strategies in the realm of cross-provincial tourism resource management.

关键词： Transboundary natural tourism resources(TNTR) Spatial difference Spatial autocorrelation Governance optimization China

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

The Spatial Differences and Influencing Factors of Tourism Resources in Ningxia,China

引用

Journal of Resources and Ecology 2024年第4期15卷 1068-1082页

作者： zhang shengrui CHI Lei ZHU He zhang Tongyan JU Hongrun Management College Ocean University of ChinaQingdaoShandong 266100China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China School of Tourism and Geography Science Qingdao UniversityQingdaoShandong 266071China

The analysis of the spatial distribution of tourism resources and the identification of its influencing factors are crucial for supporting the sustainable development of regional *** study established a comprehensive database of tourism resources in Ningxia Hui Autonomous Region(Ningxia)through a combination of literature review and field *** examined the quantitative,qualitative,and categorical characteristics of tourism resources in Ningxia,and determined the spatial patterns based on kernel density and spatial association *** study also comprehensively evaluated the societal,economic,and environmental factors influencing the spatial distribution of tourism resources in the entire region by employing the geographical detector model to quantify the influence of each *** following results were obtained.(1)There were 29218 individual tourism resources in Ningxia,comprising eight main types,23 subtypes,and 105 fundamental types,and they exhibit a hierarchical pyramidal structure.(2)The tourism resources in Ningxia displayed characteristics of“widespread regional dispersion and limited regional agglomeration”.The spatial distribution of tourism resources was highly imbalanced,and most types of tourism resources exhibit strong positive spatial correlation.(3)The altitude,annual precipitation,population density,distance from urban centers,urbanization rate,and per capita GDP were identified as significant factors influencing the spatial distribution of tourism resources in *** on the results,we recommend that the government should formulate tourism development policies in Ningxia based on local conditions to effectively address the spatial imbalances,enhance the sustainability of tourism development,and continue to promote high-quality tourism development in Ningxia.

关键词： tourism resource spatial pattern influencing factors Geo-detector Ningxia

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

基于生成对抗网络的追尾事故数据填补方法研究

引用

交通运输系统工程与信息 2024年第1期24卷 132-137,198页

作者：周备张莹张生瑞周千喜汪琴长安大学运输工程学院西安710064 北京清华同衡规划设计研究院有限公司北京100085

深入分析交通事故数据可以为规避事故发生、降低事故严重程度提供重要理论依据,然而,在事故数据采集、传输、存储过程中往往会产生数据缺失,导致统计分析结果的准确性下降、模型的误判风险上升。本文以芝加哥2016—2021年的101452条追... 详细信息

深入分析交通事故数据可以为规避事故发生、降低事故严重程度提供重要理论依据,然而,在事故数据采集、传输、存储过程中往往会产生数据缺失,导致统计分析结果的准确性下降、模型的误判风险上升。本文以芝加哥2016—2021年的101452条追尾事故数据为研究对象,将原始数据按照7∶3随机分为训练集和测试集。在训练集数据上,利用生成式插补网络(Generative Adversarial Imputation Network,GAIN)实现对缺失数据的填补。为对比不同数据填补方法的效果,同时选择多重插补(Multiple Imputation by Chained Equations,MICE)算法、期望最大化(Expectation Maximization,EM)填充算法、缺失森林(MissForest)算法和K最近邻(K-Nearest Neighbor,KNN)算法对同一数据集进行数据填补,并基于填补前后变量方差变化比较不同填补算法对数据变异性的影响。在完成数据填补的基础上,构建LightGBM三分类事故严重程度影响因素分析模型。使用原始训练集数据,以及填补后的训练集数据分别训练模型,并使用未经填补的测试集数据检验模型预测效果。结果表明,经缺失值填补后,模型性能得到一定改善,使用GAIN填补数据集训练的模型,相较于原始数据训练的模型,准确率提高了6.84%,F1提高了4.61%,AUC(Area Under the Curve)提高了10.09%,且改善效果优于其他4种填补方法。

关键词：城市交通数据填补生成对抗网络追尾事故 LightGBM模型

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

城市轨道交通站域慢行系统研究进展——基于CiteSpace的计量分析

引用

都市快轨交通 2024年第3期37卷 23-31页

作者：傅东雪张生瑞侯全华赵萌长安大学建筑学院西安710061 长安大学运输工程学院西安710064

优化城市轨道交通站域慢行系统对提高轨道交通运行效率、升级站点空间品质、促进站城一体化建设具有正向作用。为整体了解城市轨道交通站域慢行系统近年来的研究进展,借助计量分析工具CiteSpace对WoS和中国知网(CNKI)核心数据库中城市... 详细信息

优化城市轨道交通站域慢行系统对提高轨道交通运行效率、升级站点空间品质、促进站城一体化建设具有正向作用。为整体了解城市轨道交通站域慢行系统近年来的研究进展,借助计量分析工具CiteSpace对WoS和中国知网(CNKI)核心数据库中城市轨道交通站域慢行系统相关文献进行统计与分析。首先,概述文献时空、领域及期刊分布情况,剖析研究发展历程,并识别出近期研究热点为建成环境站城协同、共享单车接驳及可达性研究;然后,重点分析慢行可达性、慢行环境、慢行接驳及慢行设施规划4个方向的研究进展情况;最后,从研究对象、方法、范围等角度提出未来的研究发展方向。本文研究成果以期为我国轨道交通站域慢行系统的理论规划及实践研究提供借鉴与参考。

关键词：城市轨道交通慢行系统 CiteSpace 研究综述共享单车

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

基于广度优先搜索的全芯片光源掩模优化关键图形筛选方法

引用

光学学报 2024年第9期44卷 131-141页

作者：杨欣华江一鹏李思坤廖陆峰张双张利斌张生睿施伟杰韦亚一王向朝中国科学院上海光学精密机械研究所高端光电装备部上海201800 中国科学院大学材料与光电研究中心北京100049 中国科学院微电子研究所EDA中心北京100029 东方晶源微电子科技(北京)有限公司北京100176 中国科学院大学集成电路学院北京100049 浙江大学光电科学与工程学院浙江杭州310058

提出一种基于广度优先搜索的全芯片光源掩模优化关键图形筛选方法。通过广度优先搜索算法得到所有图形数最少的关键图形组。以45 nm标准单元库测试图形集为例,采用商用计算光刻软件Tachyon Tflex对本文方法的筛选结果进行仿真验证。结... 详细信息

提出一种基于广度优先搜索的全芯片光源掩模优化关键图形筛选方法。通过广度优先搜索算法得到所有图形数最少的关键图形组。以45 nm标准单元库测试图形集为例,采用商用计算光刻软件Tachyon Tflex对本文方法的筛选结果进行仿真验证。结果表明,本文方法获得的关键图形组的工艺窗口优于Tachyon Tflex中的同类技术。相比于基于深度优先搜索的全芯片SMO关键图形筛选方法,本文方法只筛选出所有图形数量最少的关键图形组,图形筛选效率更高。

关键词：集成光学图形筛选计算光刻全芯片光源掩模联合优化广度优先搜索

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

考虑均值及方差异质性的外卖骑手闯红灯行为影响因素分析

引用

交通信息与安全 2024年第1期42卷 59-66页

作者：蔡凌霄周备张生瑞马慧忠张新芬路熙长安大学运输工程学院西安710064 中交铁道(武汉)建设科技有限公司综合院武汉430070 交通运输部科学研究院北京100029

针对外卖骑手闯红灯事件频发、事故风险隐患较高的问题,调查了西安市多个信号交叉口处外卖骑手的闯红灯行为。将闯红灯行为作为因变量,将骑手个人特征、穿越行为特征、交通及环境特征等作为自变量,构建了考虑均值及方差异质性的随机参数... 详细信息

针对外卖骑手闯红灯事件频发、事故风险隐患较高的问题,调查了西安市多个信号交叉口处外卖骑手的闯红灯行为。将闯红灯行为作为因变量,将骑手个人特征、穿越行为特征、交通及环境特征等作为自变量,构建了考虑均值及方差异质性的随机参数Logit模型。采用Halton序列抽样进行参数估计,并结合参数估计结果和平均边际效应值量化分析各自变量对因变量的影响。结果表明:“饿了么”和“UU跑腿”的骑手闯红灯概率较低,到达时段为红灯第2段或第3段、停车线之后等待通行、冲突方向机动车流量较大等变量也会显著降低闯红灯概率,而同向违章人数增加、午高峰、晚高峰等变量会显著增加闯红灯概率。其中,使闯红灯概率提升最大的变量为晚高峰,其平均边际效应为0.278;使闯红灯概率降低最大的变量为停车线后等待,其平均边际效应为-0.222。此外,停车线后等待和晚高峰为随机参数变量,参数均服从正态分布,其均值和标准差分别为-1.379,1.359和2.502,5.360,且都具有显著的均值及方差异质性。对于停车线后等待这个变量,红灯第2段会同时提高其参数均值和方差,即增加闯红灯的概率,并增加该变量对闯红灯行为影响的随机性。对于晚高峰变量,机动车流量较大会同时降低其参数均值和方差,即降低闯红灯的概率,并降低该变量对闯红灯行为影响的随机性。此外,违章人数为1也会降低晚高峰参数的方差。

关键词：交通安全闯红灯均值及方差异质性随机参数外卖骑手信号交叉口

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

Spatial patterns of vegetation and climate in the North China Plain during the Last Glacial Maximum and Holocene climatic optimum

引用

Science China Earth Sciences 2019年第8期62卷 1279-1287页

作者： Manyue LI shengrui zhang Qinghai XU Jule XIAO Ruilin WEN Institute of Nihewan Archaeology Hebei Normal UniversityShijiazhuang050024China College of Resources and Environment Hebei Key Laboratory of Environmental Change and Ecological ConstructionHebei Normal UniversityShijiazhuang050024China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China CAS Center for Excellence in Life and Paleoenvironment Beijing100044China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China

Reconstructing the spatial patterns of regional climate and vegetation during specific intervals in the past is important for assessing the possible responses of the ecological environment under future global warming scenarios. In this study, we reconstructed the history of regional vegetation and climate based on six radiocarbon-dated pollen records from the North China Plain. Combining the results with existing pollen records, we reconstruct the paleoenvironment of the North China Plain during the Last Glacial Maximum(LGM) and the Holocene Climatic Optimum(HCO). The results show that changes in the regional vegetation since the LGM were primarily determined by climatic conditions, the geomorphic landscape and by human *** the LGM, the climate was cold and dry;mixed broadleaf-coniferous forest and deciduous-evergreen broadleaf forest developed in the southern mountains, and cold-resistant coniferous forest and mixed broadleaf-coniferous forest were present in the northern mountains. The forest cover was relatively low, with mesophytic and hygrophilous meadow occupying the southern part of the plain, and temperate grassland and desert steppe were distributed in the north;Chenopodiaceae-dominated halophytes grew on the exposed continental shelf of the Bohai Sea and Yellow Sea. During the HCO, the climate was warm and wet;deciduous broadleaf forest and deciduous-evergreen broadleaf forest, with subtropical species, developed in the southern mountains, and deciduous broadleaf forest with thermophilic species was present in northern mountains. Although the degree of forest cover was greater than during the LGM, the vegetation of the plain area was still dominated by herbs, while halophytes had migrated inland due to sea level rise. In addition, the expansion of human activities, especially the intensification of cultivation,had a significant influence on the natural vegetation. Our results provide data and a scientific basis for paleoclimate modelling and re

关键词： North China Plain Last Glacial Maximum Holocene Climatic Optimum Pollen Vegetation Paleoenvironment

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

Soybean cyst nematode-resistance: Gene identification and breeding strategies

引用

The Crop Journal 2020年第6期8卷 892-904页

作者： Abdulwahab S.Shaibu Bin Li shengrui zhang Junming Sun The National Engineering Laboratory for Crop Molecular Breeding/Ministry of Agriculture and Rural Affairs Key Laboratory of Soybean Biology(Beijing) Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Department of Agronomy Bayero UniversityKanoNigeria

Soybean cyst nematode(SCN,Heterodera glycines Ichinohe)is the most economically damaging disease of soybean worldwide,and breeding host plant resistance is the most feasible option for SCN *** this review,we summarise the progress made so far in identifying nematode-resistance genes,the currently available sources of resistance,possible mechanisms of SCN resistance and strategies for soybean *** date,only two sources of SCN resistance have been widely used,from the accessions PI 88788 and Peking,which has resulted in a shift in SCN resistance and created a narrow genetic base for SCN *** resistant germplasms for SCN are classified into two types according to their copy number variation in a 31-kb genomic region:PI 88788-type resistance requires high copy numbers of a rhg1 resistance allele(rhg1-b)and Peking-type resistance requires both low copy numbers of a different rhg1 resistance allele(rhg1-a)and a resistant allele at another locus,*** related to rhg1 primarily involves impairment of vesicle trafficking through disruption of soluble NSF-attachment protein receptor(SNARE)*** contrast,resistance via Rhg4 involves disturbance of folate homeostasis at SCN feeding sites due to alteration of the enzymatic activity of serine hydroxymethyltransferase(SHMT).Other potential mechanisms,including plant defences mediated by salicylic acid(SA)and jasmonic acid(JA)signalling modulation,have also been suggested for SCN ***,genome-wide association studies(GWAS)have identified other candidate SCN resistance genes,such as Gm *** gene functional analysis in a transient expression system could increase the efficiency of candidate gene identification,information on novel genes and mechanisms for SCN resistance remains *** beneficial candidate genes identified might,when fully exploited,be valuable for improving the efficiency of marker-assisted breeding and dissecting the molecular mechanisms under

关键词： Soybean cyst nematode(Heterodera glycines Ichinohe) Candidate gene Functional analysis Marker-assisted selection Resistance

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

PCSK9抑制剂联合阿托伐他汀对颅内动脉粥样硬化性狭窄的治疗效果

引用

中风与神经疾病杂志 2024年第4期41卷 349-354页

作者：胡群亮田竺张盛蕊吴焕成天津市北辰医院脑系科天津北辰300400

目的分析前蛋白转化酶枯草溶菌素/Kexin9型(PCSK9)抑制剂联合阿托伐他汀治疗对颅内动脉粥样硬化性狭窄(ICAS)患者颅内斑块的影响。方法前瞻性收集2022年1月―2023年4月期间天津市北辰医院收治的接受阿托伐他汀联合或未联合PCSK9抑制... 详细信息

目的分析前蛋白转化酶枯草溶菌素/Kexin9型(PCSK9)抑制剂联合阿托伐他汀治疗对颅内动脉粥样硬化性狭窄(ICAS)患者颅内斑块的影响。方法前瞻性收集2022年1月―2023年4月期间天津市北辰医院收治的接受阿托伐他汀联合或未联合PCSK9抑制剂治疗的ICAS患者的影像学和临床资料。阿托伐他汀组(下简称“他汀组”),接受阿托伐他汀10~40 mg治疗,每日一次。PCSK9抑制剂组在他汀组基础上接受依洛尤单抗注射液140 mg治疗,每2周注射1次。比较两组患者治疗前、治疗12周后HR-MRI成像检查和血脂检查情况。同时比较治疗期间主要血管事件和药物不良反应。结果共纳入98例患者,其中他汀组共46例,PCSK9抑制剂组52例。基线时两组患者的血脂水平和HR-MRI参数均无统计学差异。治疗12周后与基线水平比较分析可见,同组内比较PCSK9抑制剂组中总胆固醇(TC)、甘油三酯(TG)和低密度脂蛋白(LDL)水平均显著降低(P均0.05)。治疗12周后,PCSK9抑制剂组患者治疗反应良好比例(75.00%)显著高于他汀组(45.65%)(χ~2=8.885,P=0.003)。结论 PCSK9抑制剂联合阿托伐他汀不仅可降低ICAS患者LDL水平,还可降低狭窄严重程度,具有较高安全性。

关键词： PCSK9抑制剂他汀类药物颅内动脉粥样硬化高分辨率MRI

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

Quantitative indicative significance of pollen assemblages on vegetation coverage in deciduous Quercus forest in the central Loess Plateau, China

引用

Science China Earth Sciences 2019年第6期62卷 992-1001页

作者： Yuanhao SUN shengrui zhang Qinghai XU Yiwen LI Wei SHEN Tao WANG Zhongze ZHOU Ruchun zhang College of Resources and Environment Sciences Hebei Key Laboratory of Environmental Change and Ecological ConstructionHebei Normal University Institute of Nihewan Archaeology Hebei Normal University College of Resources and Environment Anhui University Institute of Geographical Science Hebei Academy of Sciences

We compared the pollen assemblages of surface moss samples and corresponding vegetation inventory data from 34 sites in the Huangling region of the central Loess Plateau. Our aims were to determine the characteristics of the pollen assemblages from the deciduous broadleaved forest climax community and its significance in terms of vegetation type and species composition. The pollen assemblages are dominated by woody plants such as Quercus(42% of total terrestrial pollen),Betula(16%) and Pinus(12%), with minor differences between different plant communities. The pollen assemblages of individual sampling sites differed from the vegetation composition within the 0–100 m scope and were more similar to the vegetation coverage within the 0–1000 m scope. This indicates that the surface pollen assemblages mainly reflect the comprehensive information from the vegetation composition of a large area, rather than the vegetation composition close to the sampling site. The contents of Quercus, Betula and Pinus pollen are high, and close to their vegetation coverage; whereas the contents of deciduous broadleaved arbor taxa(such as Malus and Acer) are lower, but their corresponding regional vegetation cover is higher. This suggests that the vegetation information conveyed by poorly-represented pollen taxa should be considered when interpreting stratigraphic pollen assemblages. Using the observed quantitative relationships between pollen and vegetation of the main taxa, we reconstructed the regional vegetation composition in the Gonghai Lake area of the northeastern Loess Plateau during the middle Holocene(7300–5000 yr BP). The results indicated that Quercus-dominated deciduous broadleaved forest climax community developed in the mountains surrounding the lake.

关键词： Loess Plateau Deciduous broadleaved forest Climax community Pollen assemblage Absolute vegetation coverage

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

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：