【摘 要】
：
1.ForewordrnThe year 2020 will long be recognised as a period of sadness and frustration for academics worldwide,given the catastrophic impact that the spread of novel coronavirus“2019-nCoV”-or COVID-19-has had on research and teaching activities,as well
【机 构】
：
Department of Earth Sciences,University of Oxford,Oxford OX1 3AN,United Kingdom;Geochronology and Tr
论文部分内容阅读
1.ForewordrnThe year 2020 will long be recognised as a period of sadness and frustration for academics worldwide,given the catastrophic impact that the spread of novel coronavirus“2019-nCoV”-or COVID-19-has had on research and teaching activities,as well as in their per-sonal lives.This Special Issue was designed to represent an avenue for dissemination of many studies presented at the September 2019 Geological Society of America session T23,\'Metamorphism and Orogenesis at Convergent Plate Margins\',convened by Richard Palin and Kyle Ashley.Many geologists at all career stages attended this session and presented work that was in different stages of completion;however,just a few months later,the rapid spread of COVID-19 around the globe applied sudden brakes to many of these partially completed projects.Several researchers who expressed interest in contributing to this Special Issue were forced to withdraw,either due to new responsibilities at home,laboratory closures at their places of work,or restrictions halting domestic or international travel.We appreciate that these changes in circum-stance have resulted in fewer than expected contributions to this Special Issue,and warmly thank the authors who did manage to overcome these hurdles and produce an excellent set of papers.We hope that the academic world will be able to recover from the impact of COVID-19 so that we can-as a community-move forward once again to break new ground in our understanding of this dynamic and highly unpredictable natural world.
其他文献
随着全球经济重心逐渐向亚太地区转移以及区域地缘经济联系日趋紧密,南海战略地位日益凸显,南海周边已成为全球重要战略区域和亚洲最重要的国际地缘问题区域.运用社会网络分析法、修正引力模型等方法,从贸易、投资、旅游等视角切入探究域外国家与南海周边区域的地缘经济联系演变及态势.结果表明:①2005-2019年域外国家与南海周边区域的贸易联系日益紧密但贸易合作的非均衡化现象较为突出,域内出口贸易网络呈现以中国为核心,老挝、文莱和柬埔寨为边缘地带的相对稳定网络结构特征.②域外国家对南海周边区域的投资规模显著提升但投资规
专业村是农区经济发展的重要形式,销售市场作为影响专业村发展的关键因素,其时空变化是一个值得探究的问题.文章以河南省50个专业村2008年和2017年两次追踪调查数据为基础,运用标准差椭圆、社会网络分析和地理探测器等方法,梳理了河南省50个专业村销售市场的时空变化特征.研究结果表明:①专业村销售市场在时空分布上具有差异性、扩张性、波动性和扁平化的分异特征.其中心迁移变动方向不一,空间分布范围不断扩张,市场波动性比较明显,呈现出扁平化的发展趋势.②在网络结构上表现为“省内紧缩、省外拓展”的演化格局.国内一线城
传染病影响人类福祉和可持续发展,边境口岸地区是传染病境外输入防控中的薄弱区域.然而,目前关于边境地区传染病境外输入风险和防控的研究大部分停留在指标体系构建或定性分析的层面.现有研究中缺乏从地理学视角分析边境口岸传染病的时空演化,对传染病风险的定量测度与情景模拟有待加强,对中国边境口岸的疫情防控工作缺乏精准指导.本文构建了一般意义上的边境口岸地区传染病境外输入风险指数(ERI),评估了一般年份中国陆地边境口岸地区传染病境外输入风险,并以2020年新冠肺炎疫情为例,对中国陆地边境口岸不同管控措施情境进行风险分
克山病是中国主要地方病之一,为了探究克山病流行的时空变迁规律及其与地理环境的关系,本文采用历史文献、数理统计和GIS分析等方法,对中国克山病最典型流行区域——东北地区克山病的时空分布变迁进行研究,结果表明,在民国时期(1912-1949)的38年间:①在时间变化上,东北地区克山病的年发率为84.21％,季发率为25.17％,主要在冬季流行,流行广度呈上升趋势.②在空间分布上,东北地区克山病主要在今黑龙江省龙江县至辽宁省沈阳市一线以东地区流行,形成了一个北部以黑龙江省克山县为核心、南部以吉林省延吉县为核心的
地名通名是不同地方地名具有共性特点的通用部分,表征人类社会对自然环境和行政区划变迁的认知.梳理多学科视域研究进展诠释地名通名文化景观解析逻辑,基于EOF模型、地理探测器等方法构建地名通名文化景观解析模型,探究长三角地区地名通名文化景观格局及成因.研究发现:①长三角地名通名文化景观用字比例受河网水系影响最大,地名通名文化景观用字类型丰富度在41个单元中总体呈现内陆到沿海且沿东北-西南方向递减趋势.②长三角地名通名文化景观分布异质性显著,呈现典型非均衡集聚,空间上形成皖中、苏南、浙北和上海等东西条带状的一级中
基于中国297个地级及以上城市在营家政服务企业、家政服务网络关注度等数据,构建家政服务业发展与需求评价指标体系,采用均方差决策法、耦合协调度模型和空间自相关等方法,分析中国城市家政服务业发展与需求空间分异特征及耦合协调程度.结果表明:1)中国城市家政服务业发展水平总体偏低,区域差异较大,“东—中—西”阶梯式递减态势凸显,呈现出城市群核心城市突出的点状格局;家政服务业需求程度区域差异相对较小,存在明显的空间集聚现象,形成长三角、环渤海、珠三角、海峡西岸四大高值集聚区.2)中国城市家政服务业发展与需求耦合协调
Tectonic discrimination diagrams are a key tool for understanding ancient volcanic rock origins.In this contribution we compile over 15,000 whole rock compositions to re-evaluate the Ti-V discrimination dia-gram and compare it to another commonly used too
The causes of the global mass extinction that occurred around the Permian-Triassic boundary have been widely studied through the geological record and in various locations.The results show that volcanic activity was a key factor in initiating the crisis d
以沿海50个港口城市为样本,利用跨国航运公司及相关机构组织联系构建指标体系,并根据航运网络联系数据构建中国大陆航运中心关系矩阵,进而识别出航运中心的层级体系与网络空间联系,揭示不同等级航运中心的相互作用关系.结果表明:1)中国大陆航运中心形成5个层级的等级体系,其中,具有国际航运职能的分为全球性国际航运中心、区域性国际航运中心和国际航运节点3个等级,上海、深圳、宁波—舟山、青岛、广州、天津、厦门、大连八大国际航运中心构成我国对外航运联系的主要框架.2)多功能航运要素网络分析显示,不同要素航运中心网络联系呈
Excavation Damaged Zone(EDZ)scope is important for optimizing excavation and support schemes in deep underground caverns.However,accurately predicting the full EDZ scope within the surrounding rock masses of deep underground caverns during excavation rema