地震速报新媒体平台的应用创新与发展策略     

翟颖  侯建民  马秀丹  郭凯  吴峥 《中国地震》2024,40(1):197-207

融媒体背景下,地震速报新媒体平台以其突出的技术优势和传播优势,在信息发布、震后应急、地震科普等方面发挥了重要的作用。本文基于地震速报新媒体平台的基本功能,深入探讨地震速报新媒体平台的创新点和薄弱点。该平台开拓了“人工+自动”的新媒体运维模式,实现了政府、公众的双向服务,具备一定创新性,但在联动能力、内容生产能力上仍存在发展空间。结合当下发展,提出了进一步提升地震速报新媒体平台影响力的发展策略。  相似文献   

Multiscale effects and drivers of landscape heterogeneity for water-related ecosystem services in urban agglomerations     

Lie Huang  Xiaohong Chen  Changxin Ye  Ze Yuan  Kunlong He 《水文研究》2024,38(2):e15081

Understanding the multiscale impacts and drivers of urban agglomeration landscape patterns for ecosystem services (ESs), especially water-related ecosystem services (WESs), is essential for the development of regional ecological management. However, the multiscale impacts and driving mechanisms of urban agglomeration landscape patterns for ESs have not been adequately explained. In this study, multivariate data were employed, and the InVEST model, trend test method, coupled GeoDetector and geographically and temporally weighted regression (GTWR) method were utilized to comprehensively explore the spatial and temporal changes in landscape patterns and WESs in the Pearl River Delta urban agglomeration (PRDUA) at various grid and administrative scales from 1990 to 2020 and to determine the driving mechanisms affecting WESs. The results indicated that the variation characteristics of landscape patterns and WESs in the PRDUA were consistent, forming a binary spatial structure of core and peripheral areas in an inverted “U” shape around the estuary of the Pearl River. The relationship between landscape patterns and WESs weakened with the increase of scale, and the correlation coefficient decreased by approximately 0.10 from 5 km to 10 km grid scale. Additionally, precipitation (PRE) was the main factor controlling WESs changes in the PRDUA, explaining more than 50% of the changes in WESs, and the regression coefficients ranged from 0.0825 to 0.1584. Changes in WESs were the result of the combined effects of natural factors, including PRE, landscape pattern, elevation, slope, and socioeconomic factors, such as population and gross domestic product (GDP). Overall, these findings could contribute to optimizing regional landscape patterns and fostering sustainable development of the ecological environment in urban agglomerations.  相似文献   

Assessing impacts of cemeteries on water quality in an urban headwater watershed with mixed human-built infrastructure     

Samuel Nesheim  Zhongjie Yu  Samuel Tuttle  Jenna Klein  Tao Wen 《水文研究》2024,38(3):e15128

Cemeteries are understudied integral components to urban watersheds, which provide ecosystem services but can also export nutrients, trace elements, and other contaminants to nearby water bodies. In this study, we focus on Meadowbrook Creek, an urban headwater stream in Syracuse, New York (USA), which has shown significant nitrate contributions from a local cemetery. We collected biweekly surface water samples over the course of 1 year from 2022 to 2023 for analysis of major and trace elemental concentrations including Na, Ca, Mg, K, F, Cl, sulfate, and nitrate. Here, we aim to assess the impact of various human infrastructures on urban stream water quality with a particular focus on the cemetery and nitrate. A comparison between the new dataset in this study and previously reported water chemistry data in Meadowbrook in 2012 suggests a decade-long impact of road salting and the cemetery on water quality particularly with respect to Na, Cl, and nitrate. Sulfate, Mg, Ca, and K are likely mainly geogenic. Stable nitrogen isotope data, the usage of concrete or steel vaults in the cemetery in the past 50 years, and the lack of correlation between nitrate and fluoride concentrations in stream water argue against burial decay products being a major source of nitrate to the stream. Instead, other nitrate sources that exist in the cemetery such as, fertilizer, decaying plant material, and wastewater, are more viable dominant nitrate sources. In addition, nitrate loading calculations indicate that the groundwater-connected reach, including the cemetery, acts as an annual net sink for nitrate despite the seasonally varying sink-source patterns.  相似文献   

基于本体的土地信息Web服务体系结构设计     

陈建杰  叶智宣  柯正谊 《地球信息科学学报》2006,8(2):49-53

整合现有土地信息资源,实现土地信息的交换与共享是当前国土资源数据交换中心(clearinghouse)建设的关键任务。本文以土地登记为例,探讨了本体技术在服务注册和服务请求上的领域知识表示问题,并在OWIL-S本体描述语言基础上结合WSDL,实现了对Web服务的检索、匹配和学习,有效地解决了UDDI土地信息资源的语义描述。最后,给出了基于本体的土地信息服务总体设计框架以及服务请求实现过程。  相似文献   

基于云环境的云南地震灾害快速评估与信息服务系统在巧家MS5.0地震中的应用     

郑川  李兆隆  贾召亮  曹彦波 《华北地震科学》2021,39(1):1-8

基于云南地震灾害快速评估系统现状与使用中发现的问题,对其在空间算法、动态集群分布式并行计算、信息服务模式等多方面进行优化,设计了云环境下的云南地震灾害快速评估与信息服务系统,并结合系统在巧家MS5.0地震中的使用情况进行综合分析.结果表明:新的地震灾害应急指挥技术系统产出的应急产品,在时效性与准确性方面均得到较大提高,...  相似文献   

Producer Services Research in U.S. Regional Studies     

James W. Harrington 《The Professional geographer》1995,47(1):87-96

Fifteen years of academic concern about the extent, causes, and implications of the explosion of service activities as a proportion of regional and national employment and income have verified the increased proportion of employment in these activities, their tendencies toward concentration, their structural role in local economies, their potential to form part of a region's economic base, and their importance in assisting other activities in the regional economy. There has been some progress in modeling the locational needs of intermediate or producer services. Beyond this progress, however, lies much uncharted territory. This paper makes recommendations for the direction of basic research and of policy-oriented work.  相似文献   

基于竞争遗传算法的海洋云平台资源调度模型研究          下载免费PDF全文

王烨嘉  王蕾  陈竹  周海英 《海洋开发与管理》2023,40(11):31-36

高质量的海洋自然资源管理离不开数据和信息的支撑。鉴于海洋数据的特殊性，海洋数据处理常涉及长时间序列或大空间范围的处理工作，对于此类密集型计算为主的数据处理，通用型云平台存在效率不高的突出问题。文章在全面分析Hadoop平台原生资源调度算法的基础上，结合海洋数据处理密集型计算的特点，创新性地提出了基于竞争模型的遗传算法任务调度策略(CGA),有效地解决了遗传算法求解速度受初始化种群与种群进化测量影响较大的问题。此外，为加快收敛速度，引入竞争机制，构建基于种群竞争的自适应进化模型。通过实际验证和比对，证明改进后的算法在收敛速度及收敛结果的稳定性上都优于传统算法，有效地改进了海洋云平台资源调度的能力，提升了海洋数据的处理效率。  相似文献   

面向实时应用的遥感服务技术     

李德仁  丁霖  邵振峰 《遥感学报》2021,25(1):15-24

当前中国卫星事业正面临着难得的发展机遇,以应用需求为牵引,着力提升卫星遥感的服务能力,充分发挥卫星的应用效益,突破通信、导航、遥感卫星的系统壁垒,构建通导遥一体化的天基信息实时服务系统,提供全天时、全天候、全地域的面向实时应用的服务.本文首先分析了天空地海对地观测传感网实时服务能力,接着阐述了遥感技术实时应用服务需求(...  相似文献   

基于生态系统服务的黄河三角洲生态风险评估研究          下载免费PDF全文

郭贺  樊彦国  管青春  樊博文  王勇 《海洋科学》2023,47(5):15-26

生态安全与人类福祉密切相关,因此量化区域生态风险能够有效地对高风险地区进行防范,同时更利于区域可持续发展。本文通过InVEST模型测算黄河三角洲区域1990年、2000年、2010年、2020年生态系统碳存储、生境质量和土壤保持3种生态系统服务的物理量,根据测算结果构建生态风险评估模型,在此基础上对黄河三角洲生态风险进行时空格局演变特征分析。结果表明:1)黄河三角洲区域生态系统服务整体弱化,在建设用地、水域等区域最为明显。2)1990—2020年黄河三角洲区域碳存储整体呈现内陆高沿海低的空间格局,生境质量空间波动范围增大,土壤保持能力降低。3)黄河三角洲区域生态风险有上升趋势。沿海水域及建设用地区域受风险概率较大,而林草地等植被覆盖区域生态风险低。研究结果可为黄河流域生态保护和高质量发展提供决策支持与参考。  相似文献