Social media crowdsourcing for rapid damage assessment following a sudden-onset natural hazard event

Rapid appraisal of damages related to hazard events is of importance to first responders, government agencies, insurance industries, and other private and public organizations. While satellite monitoring, ground-based sensor systems, inspections and other technologies provide data to inform post-disaster response, crowdsourcing through social media is an additional and novel data source. In this study, the use of social media data, principally Twitter postings, is investigated to make approximate but rapid early assessments of damages following a disaster. The goal is to explore the potential utility of using social media data for rapid damage assessment after sudden-onset hazard events and to identify insights related to potential challenges. This study defines a text-based damage assessment scale for earthquake damages, and then develops a text classification model for rapid damage assessment. Although the accuracy remains a challenge compared to ground-based instrumental readings and inspections, the proposed damage assessment model features rapidity with large amounts of data at spatial densities that exceed those of conventional sensor networks. The 2019 Ridgecrest, California earthquake sequence is investigated as a case study.     

四川省水上运动学校赛艇运动员损伤原因调查分析

本文通过运用问卷调查法、文献资料法、访谈法和统计法等研究方法,对四川省水上运动学校赛艇运动员常见运动损伤原因进行研究。研究发现：赛艇运动员在一年内都有损伤,容易损伤部位主要是腰部和肩部,出现损伤季节主要是10—12月和1—3月,损伤原因主要是身体疲劳。本次研究对赛艇运动员的损伤特点,提出相应的预防措施减少损伤,为更好的提高赛艇运动员水平提供科学的理论依据。     

数控铣床操作实训教学中刀具损坏原因分析

针对学生数铣操作实训教学中容易出现的刀具损坏现象,把整个加工过程分为三个阶段对刀具损坏的现象进行归纳,分析出每种刀具损坏现象的原因,对学生易犯的一些错误操作提出解决措施。通过归纳分析刀具损坏原因,便于有针对性的对学生进行刀具安全讲解,对数铣实训教学有很好的现实意义。     

深圳市阴香粉实病的危害与防治

本文总结了深圳市阴香粉实病的危害情况，分析了阴香粉实病的症状和病原及经染循环，提出了农业、化学及综合防治措施。     

地下结构抗震设计方法综合对比

地下结构不同于地上结构对地震的响应,在抗震设计理论和方法方面有共同点,也有区别,本文详细介绍了常用的几种抗震设计方法,并对各种方法的分类、选择、应用、范围及优缺点进行综合对比,提出设计建议。     

略论敲诈勒索罪的两个重要问题

对于在什么情况下，公私财物或财产性利益才能成为敲诈勒索罪的犯罪对象，少有学者论及。但这却是认定何种行为能构成敲诈勒索罪的重要问题。一般刑法教科书论及的敲诈勒索罪与抢劫罪的区别，很少能为在司法实践中区分敲诈勒索罪与抢劫罪提供什么有益的帮助。有必要对敲诈勒索罪与抢劫罪的区加别作更细致的研究。     

Structural damage identification using test static data based on grey system theory

INTRODUCTION Structural damage detection technique addresses the problem of how to locate and detect damage that occurred in a structure by using the observed changes of its dynamic and static characteristics. In recent years, damage assessment of structure has drawn wide attention from various engineering fields. Gen-erally, the existing approaches proposed in this area can be clarified into two major categories: the dy-namic identification methods using dynamic test data and the static …     

温州地区白蚁的危害和防治

白蚁具有极强的隐蔽性、繁殖能力和对环境的适应能力，其危害十分严重。本文对温州地区白蚁的生活习性及发生原因、危害进行了分析，并提出了对白蚁进行防治的措施。     

社区网络上伊辛模型的损伤扩散

运用损伤扩散技术,研究了社区网络上伊辛模型的动力学特性.讨论了网络拓扑结构对系统统计特性的影响.结果显示,损伤随连边概率的增大而减小;当网络的拓扑结构不变时,损伤值随着温度的增加而增大,在临界温度处系统的损伤出现突变.     

冲击损伤的增强X射线实时成像检测

对复合材料结构承载能力影响最严重、安全威胁最大的是冲击损伤,因此冲击损伤是复合材料损伤的主要研究对象。本文从增强剂四溴乙烷的浓度、施加方式与时间等方面的选定,进行了冲击损伤的增强X射线实时成像检测研究,其结果是对超声波C扫描检测结果的进一步验证与补充。