Max‐infinitely divisible models and inference for spatial extremes

For many environmental processes, recent studies have shown that the dependence strength is decreasing when quantile levels increase. This implies that the popular max‐stable models are inadequate to capture the rate of joint tail decay, and to estimate joint extremal probabilities beyond observed levels. We here develop a more flexible modeling framework based on the class of max‐infinitely divisible processes, which extend max‐stable processes while retaining dependence properties that are natural for maxima. We propose two parametric constructions for max‐infinitely divisible models, which relax the max‐stability property but remain close to some popular max‐stable models obtained as special cases. The first model considers maxima over a finite, random number of independent observations, while the second model generalizes the spectral representation of max‐stable processes. Inference is performed using a pairwise likelihood. We illustrate the benefits of our new modeling framework on Dutch wind gust maxima calculated over different time units. Results strongly suggest that our proposed models outperform other natural models, such as the Student‐t copula process and its max‐stable limit, even for large block sizes.     

“四史”教育融入高校思政课教学的五维逻辑进路

历史照亮过去，历史启迪未来。以党史、新中国史、改革开放史、社会主义发展史为核心内容的“四史”教育，是以历史为基础的思想政治教育。从党史、新中国史、改革开放史、社会主义发展史中挖掘思想政治理论课教育资源，对高校传承红色基因、落实立德树人根本任务具有重要的指导意义。以庆祝中国共产党成立100周年为契机，将“四史”教育融入高校思想政治理论课教学，必须遵循相应的逻辑理路：树立正确党史观、坚定理想信念的价值追求是融入的逻辑立场；强化大历史观、理解党的伟大贡献是融入的逻辑方法；坚持内在统一性、把握“四史”教育的整体性逻辑是融入的基本前提；抓住侧重点、精准对接各门大学生思想政治理论课程是融入的逻辑核心；坚持实践逻辑、引导大学生从“四史”中汲取智慧和力量是融入的根本遵循。     

“通知—删除”规则在电子商务专利侵权中的适用——兼论《民法典》第1195条

随着电子商务的蓬勃发展，“通知—删除”规则在有效制止电子商务专利侵权中具有重要作用。我国在21世纪初引进“通知—删除”规则，逐步构建了适用于电子商务领域专利侵权的“通知—删除”规则。《民法典》正式施行以来，“通知—删除”规则在适用于电子商务专利侵权中暴露出诸多问题：存在规则滥用隐患，权利人与商家利益失衡，通知与反通知的审核标准难以一致，因错误通知造成商家损失难以恢复，等等。解决好这些问题，需从专利侵权的特殊性出发，贴合《民法典》第1195条的规定，遵循“通知—删除”规则的立法目的进行解释适用；应重视和探索电子商务平台的自治能力，推动“通知—删除”规则在电子商务专利侵权中的解释适用。     

元代墓志校读札记

墓志作为一种重要的出土文献，是研究当时社会、历史、文化、语言文字等的宝贵语料。目前，由于各种原因，现行墓志在校点方面仍存在诸多的问题。选取元代墓志为例，通过比照拓片，运用语言学、校勘学、文献学等方法，对其中的校点可商之处进行考辨，以还原墓志之原貌，促进墓志文献的研读。     

Beyond Piketty: A new perspective on poverty and inequality in India

The socio-economic literature has focused much on how overall inequality in income distribution (frequently measured by the Gini coefficient) undermines the “trickle down” effect. In other words, the higher the inequality in the income distribution, the lower is the growth elasticity of poverty. However, with the publication of Piketty’s magnum opus (2014), and a subsequent study by Chancel and Piketty (2017) of evolution of income inequality in India since 1922, the focus has shifted to the income disparity between the richest 1% (or 0.01%) and the bottom 50%. Their central argument is that the rapid growth of income at the top end of millionaires and billionaires is a by-product of growth. The present study extends this argument by linking it to poverty indices in India. Based on the India Human Development Survey 2005–12 – a nationwide panel survey-we examine the links between poverty and income inequality, especially in the upper tail relative to the bottom 50%, state affluence (measured in per capita income) and their interaction or their joint effect. Another feature of our research is that we analyse their effects on the FGT class of poverty indices. The results are similar in as much as direction of association is concerned but the elasticities vary with the poverty index. The growth elasticities are negative and significant for all poverty indices. In all three cases, the disparity between the income share of the top 1% and share of the bottom 50% is associated with greater poverty. These elasticities are much higher than the (absolute) income elasticities except in the case of the poverty gap. The largest increase occurs in the poverty gap squared – a 1% greater income disparity is associated with a 1.24% higher value of this index. Thus the consequences of even a small increase in the income disparity are alarming for the poorest.     

Caring for the carers: Ensuring the provision of quality maternity care during a global pandemic

The COVID-19 pandemic is impacting health systems worldwide. Maternity care providers must continue their core business in caring and supporting women, newborns and their families whilst also adapting to a rapidly changing health system environment. This article provides an overview of important considerations for supporting the emotional, mental and physical health needs of maternity care providers in the context of the unprecedented crisis that COVID-19 presents. Cooperation, planning ahead and adequate availability of PPE is critical. Thinking about the needs of maternity providers to prevent stress and burnout is essential. Emotional and psychological support needs to be available throughout the response. Prioritising food, rest and exercise are important. Healthcare workers are every country’s most valuable resource and maternity providers need to be supported to provide the best quality care they can to women and newborns in exceptionally trying circumstances.     

近代巴蜀诗人李士棻生卒年及别号考略

近代巴蜀诗人李士棻曾被曾国藩誉为“太白醉魂”，为曾府门下“四川三李”之一，其诗作有浓郁的巴蜀文化特色。然李氏仕宦不显，长期以来学界对其关注不足，学界近年不多的相关研究，多围绕国内所存的文献，对其诗歌创作进行艺术分析，对诗人的生平介绍多简单略过，没有严谨的考证，目前仍然很有争议。通过搜罗国内外现存典籍，综合目前所见李士棻本人著述，辅以晚清近代重要报刊《申报》和与李氏有交往的朝鲜文人文献，考证其生卒年及别号，冀为今后的相关研究解决基础问题。     

基于公平关切线上与线下销售渠道演化博弈研究

公平关切影响决策行为，为分析公平关切对线上与线下销售渠道决策行为和竞争策略影响，构建线上与线下销售渠道博弈模型。基于博弈模型，对比分析四种公平关切情况对线上与线下决策变量和利润影响。进一步，为获得线上与线下稳定博弈结果，基于四种公平关切构建演化博弈模型，分析不同公平关切行为对销售渠道参与者决策行为影响。研究主要得到：一方采取公平关切时，会减少另一方收益；一方采取合作公平关切策略与另一方采取公平关切密切相关，也即当一方采取公平关切概率大于某一阀值时，另一方采取不公平关切；线上与线下经过长期演化博弈，演化稳定点为双方都采取公平关切。     

On MLEs of the parameters of a modified Weibull distribution based on record values

The modified Weibull distribution can be used quite effectively to model complex data from mechanical engineering or survival analysis studies that posses a monotonic or a bathtub-shape hazard rate. In this paper, we study the MLEs of the parameters of a modified Weibull distribution model in the presence of upper kth record values. The existence and uniqueness of the MLEs are proven in this case. Real data analysis is performed for illustrative purposes.     

Patterns of alcohol use and marijuana use among students at 2- and 4-year institutions

Objective: The objective of this study was to understand substance use patterns of alcohol, marijuana, and simultaneous alcohol and marijuana (SAM) use among 2- and 4-year college students. Participants: Participants were 526 young adults aged 18–23 (n?=?355 4-year students; n?=?171 2-year students) recruited from February 2015 to January 2016 who were participating in a larger longitudinal study. Methods: Latent class analysis (LCA) was used to identify past-month classes of alcohol, marijuana, and SAM use. Results: Among both 2- and 4-year students, a four-class solution yielded the best-fitting model, with 2-year classes tending to include greater marijuana use and less alcohol use and 4-year classes tending to include heavy alcohol use. Demographic characteristics were largely similar across classes. Conclusions: Classes of alcohol, marijuana, and SAM use differed by education status. Screening and prevention efforts for 4-year students may need to be tailored for the needs of 2-year students.