Evaluating effects of atmospheric CO2 on stability of global climate: a cell-to-cell mapping approach

Atmospheric carbon dioxide concentration [CO2], incoming solar radiation and sea ice coverage are among the most important factors that control the global climate. By applying the simple cell-to-cell mapping technique to a simplified atmosphere-ocean-sea ice feedback climate model, effects of these factors on the stability of the climatic system are studied. The current climatic system is found to be stable but highly nonlinear. The resiliency of stability increases with [CO2] to a summit when [CO2] reaches 290 μL/L which is comparable to the pre-industrial level, suggesting carbon dioxide is essential to the stability of the global climate. With [CO2] rising further, the global climate stability decreases, the mean ocean temperature goes up and the sea ice coverage shrinks in the polar region. When the incoming solar radiation is intensified, the ice coverage gradually diminishes, but the mean ocean temperature remains relatively constant. Overall, our analysis suggests that at the current levels of three external factors the stability of global climate is highly resilient. However, there exists a possibility of extreme states of climate, such as a snow-ball earth and an ice-free earth.     

基于辐射力模型的广西城市辐射范围研究

基于辐射力模型对广西城市辐射范围进行研究,发现:广西绝大部分城市规模小.辐射范围小;城市之间相互作用、相互影响弱;湘桂-南防铁路沿线地区最有可能形成城镇密集带.     

基于微博数据的中原城市群空间联系强度测度

空间联系强度是城市群发展阶段、态势、功能定位的重要表征.在大数据背景下,随着移动终端的普及和网络联系平台的广泛使用,人流在不同地区的空间移动能够得到较准确的统计和表达.在总结以往城市群空间联系研究方法的基础上,提出一种新的基于微博数据判别城市之间空间联系强度的方法,弥补了由于缺乏城际通勤数据而导致的传统空间联系强度判别方法的不足.新方法可以较准确地判别城市群地区各个城市的空间联系强度与组织类型.     

货舱温度场及气象条件的分析计算

远洋运输中的货物霉变除了与货物自身的理化特性有关外,货物的外部环境即货舱中的气象条件也是一个重要因素。长期以来,货物在运输过程中的货舱通风通常均依据经验来控制。本文分析计算了货舱中描述气象条件的多个物理量之间的函数关系以及主要参数,并利用解析法和图解法来确定其数值,以达到符合热力学和通风工程规律的通风要求,获得良好的货舱气象条件。     

急性低氧暴露对足球运动员甲襞微循环影响的实验研究

通过实验观察急性低氧暴露对足球运动员甲襞微循环的影响并探讨其作用机理,得出:急性低氧暴露后,(1)运动员安静时形态积分较高,运动后10min、15min的形态积分均比安静时明显降低(P<0.05);(2)运动后即刻的流态积分、总积分均显著高于安静时(P<0.05),运动后5min、10min及15min时,血流速逐渐加快,红细胞聚集程度减轻,积分值降低。     

单片微机在仪器、仪表智能化方面的探讨

本文以DPB—Ⅱ型红外测温仪为侧,讨论仪器仪表采用单片微机作为中心控制单元时的基本结构、微机信号处理系统硬件以及系统软件流程简图。     

浅谈中师体育在全民健身中的作用

全民健身是增强人民体质,推动我国社会主义发展的重要措施。中师体育是学校体育工作的重要组成部分,是全民健身活动的重要一环。中师体育的好坏直接影响一代人的健康状况,我们体育工作者必须以身作则,为全民健身运动更好地开展,做出自己应有的贡献。     

广西Ⅳ类密封放射源使用单位辐射工作人员受照剂量监测结果分析

广西约有100多家Ⅳ类密封放射源核技术应用单位,300多人处于这些核技术应用单位的辐射工作岗位。文章通过对多年监测数据与国家标准限值比对分析,表明辐射工作人员因辐射工作受照射的剂量远低于国家标准。     

Where populist citizens get the news: An investigation of news audience polarization along populist attitudes in 11 countries

This article presents a secondary analysis of two multi-national cross-sectional surveys conducted in 2015 (11 countries, N?=?10,570) and 2017 (4 countries, N?=?2165) to examine the relationship between populist attitudes and media use. The results indicate that populist citizens are more likely to consume news than non-populist citizens. Specifically, populist citizens exhibit a preference for commercial television (TV) news, as well as a tendency to read tabloid newspapers. While they use fewer quality newspapers, public TV news are not systematically avoided. Regarding the online news environment, populist citizens prefer Facebook over Twitter as a source of political information. This selective pattern will be discussed in light of the debates on news audience polarization and political polarization.     

News audience fragmentation in the Japanese Twittersphere

ABSTRACT

Although computational approaches to ideology-based audience fragmentation are promising, they are not without limitations. First, most existing studies have focused on the US, and the cross-national validity of their results has rarely been tested. Second, previous studies that rely solely on behavioral data from social media tend to make strong analytical assumptions such as that Twitter users prefer to follow media and politicians whose ideological positions are similar to their own, and that the ideologies of political elites can be extrapolated to infer the ideologies of ordinary users. We aim to address these limitations. First, we focus on Japan to test the generalizability of US findings in an Asian context. Second, we do not rely solely on behavioral measurement but combine survey and social media data to infer the ideologies of Twitter users. Results indicate that our classifier built based on these self-reported ideologies produces more valid estimates than naïve extrapolation from views of the elites. Based on these improved estimates of Twitter users’ ideologies, we demonstrate that the ideological distributions of those who follow major Japanese media accounts on Twitter largely overlap, suggesting an absence of ideology-based audience fragmentation.