Further properties on the degree distance of graphs

In this paper, we study the degree distance of a connected graph \(G\), defined as \(D^{'} (G)=\sum _{u\in V(G)} d_{G} (u)D_{G} (u)\), where \(D_{G} (u)\) is the sum of distances between the vertex \(u\) and all other vertices in \(G\) and \(d_{G} (u)\) denotes the degree of vertex \(u\) in \(G\). Our main purpose is to investigate some properties of degree distance. We first investigate degree distance of tensor product \(G\times K_{m_0,m_1,\cdots ,m_{r-1}}\), where \(K_{m_0,m_1,\cdots ,m_{r-1}}\) is the complete multipartite graph with partite sets of sizes \(m_0,m_1,\cdots ,m_{r-1}\), and we present explicit formulas for degree distance of the product graph. In addition, we give some Nordhaus–Gaddum type bounds for degree distance. Finally, we compare the degree distance and eccentric distance sum for some graph families.     

国际贸易中的跟单风险及防范措施

阐述了国际贸易中跟单的发展现状,探讨了国际贸易中的跟单要求及其跟单分显得来源.在此基础上,提出在国际贸易中通过谨慎选取贸易合作伙伴、严格审查签订合同时的各条款单据、必须附有商品检测条款、提高贸易双方业务人员专业素质跟单风险的防范措施.     

A Case Study for Modelling Cancer Incidence Using Bayesian Spatio‐Temporal Models

Researchers familiar with spatial models are aware of the challenge of choosing the level of spatial aggregation. Few studies have been published on the investigation of temporal aggregation and its impact on inferences regarding disease outcome in space–time analyses. We perform a case study for modelling individual disease outcomes using several Bayesian hierarchical spatio‐temporal models, while taking into account the possible impact of spatial and temporal aggregation. Using longitudinal breast cancer data from South East Queensland, Australia, we consider both parametric and non‐parametric formulations for temporal effects at various levels of aggregation. Two temporal smoothness priors are considered separately; each is modelled with fixed effects for the covariates and an intrinsic conditional autoregressive prior for the spatial random effects. Our case study reveals that different model formulations produce considerably different model performances. For this particular dataset, a classical parametric formulation that assumes a linear time trend produces the best fit among the five models considered. Different aggregation levels of temporal random effects were found to have little impact on model goodness‐of‐fit and estimation of fixed effects.     

星链：全球卫星互联网时代的传播体系重构

埃隆·马斯克的SpaceX公司于2020年上半年频发卫星,并计划下半年开启卫星网络公测,这意味着互联网将通过卫星通信技术实现全球连接。作为一种前沿科技,星链具备发射成本低、网速快、全球覆盖、商业价值大和军事用途广等特点。与目前备受关注的5G技术相比,星链在连接空间和特殊场景方面独具优势。未来,卫星互联网与地面基站之间的“星地融合”将成为万物互联时代的网络连接解决方案。以星链为代表的卫星互联网技术,使传播信道发生新变革,带来了波及整个传播链的深远影响。其将建构天地一体的连接模式、万物互联的信息体系和丰富多元的应用场景,并可能产生新的数据霸权问题,对我国互联网之治理形成挑战。     

MD&A语言真诚性能够提高资本市场定价效率吗?——基于股价同步性的分析

真诚是语言沟通的灵魂,MD&A作为上市公司与投资者交流公司经营管理情况最为重要的文本载体,其语言真诚性将对企业资本市场表现产生重要影响。以2007—2017年沪深A股上市公司的年报为样本,实证检验了年报中MD&A语言真诚性对股价同步性的影响,研究发现:(1)MD&A语言越真诚,股价同步性越低,说明MD&A语言真诚性能够将更多的公司特质信息融入股价,提高资本市场定价效率;(2)进一步结合公司外部信息环境,发现在地区社会信任水平较低与产品市场竞争程度较低的环境中,MD&A语言真诚性对提高资本市场定价效率的作用更强;(3)考虑到资本市场信息的有效传递有赖于信息中介,基于中介效应模型,检验发现MD&A语言真诚性的提高吸引了更多分析师跟踪,进而降低了股价同步性,提高了资本市场定价效率。基于上述结论,监管层应积极推进文本信息披露评价体系的建立,促使公司不断改进自身的信息披露质量,以保证信息传达的准确性并提升资本市场效率;同时,需要进一步引导和加强证券分析师等信用中介平台高质量发展,促进资本市场健康稳定发展。     

敦煌壁画射箭图像研究

本文分析了敦煌壁画射箭图像所反映的民族历史和北方少数民族骑射礼仪、特点。     

民族自治地方立法权问题研究

我国现行立法体制具有“一元二级多层”的特点。民族自治地方立法权是我国立法体制中的一个重要组成部分,本文阐述了民族自治地方立法权的主要内容,分析了民族自治地方立法权在我国立法体制中的地位,并提出了相应的完善意见。     

A Study on Dialogic Communication,Trust, and Distrust: Testing a Scale for Measuring Organization–Public Dialogic Communication (OPDC)

Although there is a wide range of discussion on dialogic communication, or dialogue, in the field of public relations, little research has dealt with the empirical measurement of organization–public dialogue. The primary purpose of this study was to test the proposed scale for measuring organization–public dialogic communication (OPDC). Additionally, this study aimed to demonstrate the link between dialogic communication and trust/distrust between organizations studied and their publics. For the research purpose, two anonymous online surveys were used to collect the data. The participants were American consumers randomly selected from a representative research panel of online survey participants (N = 704). According to the results, the proposed 2-factor, 28-item scale of OPDC was valid and reliable. Also, for further empirical validation, this study found that the proposed scale of OPDC is significantly related to public trust and distrust. Given the scarcity of the empirical research on OPDC, the results of this study can contribute to further research in communication management.     

转轨时期我国体育职业化的利弊分析

竞技体育的职业化是体育发展到一定历史阶段的必然产物。运用文献资料法对转轨时期体育职业化在我国产生的原因、利弊及发展趋势等问题进行了分析，为我国体育职业化的发展提供理论依据和参考。     

从宏观层面把握马克思主义中国化的丰富经验

中国共产党90多年来推进马克思主义中国化的丰富经验和教训，是我们继续前进的基础。已有研究成果多是基于微观角度的具体总结和直观概括。宏观来看，推进马克思主义中国化这个伟大工程：要有全方位的价值观——世界视域、民族意识、群众观念；要有较全面的方法论——继承意识、发展观念、创新勇气；要有较科学的思想路线——解放思想、实事求是、与时俱进。继续推进马克思主义中国化这一系统工程与时俱进的丰富和发展，需要我们横观中外、纵览古今、内外兼修、主客兼顾、原则性和灵活性并用、理论应用和理论创新并举。