一类收敛级数求和的微分方程解法

从微分方程的角度出发 ,分三个方面讨论了一类收敛级数求和问题的具体解法。     

系统功能语篇分析实证研究——以主位结构为例

运用Halliday系统功能语法的观点和方法,主要探讨了语篇功能赖以实现的主位系统,分析主位结构和主位推进程序在实现语篇的衔接和连贯中的作用、所具有的文体功能以及主位的选择和使用表达说话者的不同目的的关系。     

基于改进突变级数法的农产品物流产业评估模型研究

对农产品物流产业发展水平进行客观、准确的分析与评估,可为政府部门优化与调整产业发展、合理制定产业规划提供科学依据。运用突变级数法与离差最大化法构建农产品物流产业评估模型,并选取广东和山东两省20102014年相关数据对构建的评估模型进行实例分析。结果表明：广东省农产品物流产业发展的优势主要体现在信息化水平与经济基础两方面,基础设施建设则是当前制约其产业发展的关键因素;而庞大的产业规模是现阶段支撑山东省农产品物流产业发展的重要力量。改进的突变级数评估模型既克服了主观赋权的局限,又不失科学性和合理性,计算简单,具有重要实用价值。     

Sex differences in the development of mild cognitive impairment and probable Alzheimer’s disease as predicted by hippocampal volume or white matter hyperintensities

This study examined biological sex differences in the development of mild cognitive impairment (MCI) and probable Alzheimer’s disease (AD) development as predicted by changes in the hippocampus or white matter hyperintensities. A secondary data analysis of the National Alzheimer’s Coordinating Center Uniform Data Set was conducted. We selected samples of participants with normal cognition at baseline who progressed to MCI (n = 483) and those who progressed to probable AD (n = 211) to determine if hippocampal volume or white matter hyperintensities (WMH) at baseline predicted progression to probable AD or MCI and whether the rate of progression differed between men and women. The survival analyses indicated that changes in hippocampal volumes affected the progression to probable AD (HR = 0.535, 95% CI [0.300–0.953]) only among women. White men had an increased rate of progression to AD (HR = 4.396, CI [1.012–19.08]; HR = 4.665, 95% CI [1.072–20.29]) compared to men in other race and ethnic groups. Among women, increases in hippocampal volume ratio led to decreased rates of progressing to MCI (HR = 0.386, 95% CI [0.166–0.901]). Increased WMH among men led to faster progression to MCI (HR = 1.048. 95% CI [1.011–1.086]). Women and men who were older at baseline were more likely to progress to MCI. In addition, results from longitudinal analyses showed that women with a higher CDR global score, older age at baseline, or more disinhibition symptoms experienced higher odds of MCI development. Changes in hippocampal volumes affect the progression to or odds of probable AD (and MCI) more so among women than men, while changes in WMH affected the progression to MCI only among men.     

英汉学术语篇主位推进模式比较研究

以国内外4种社会学顶级期刊的论文为语料,采用量化分析与文本分析相结合的方法,比较研究了英语和汉语论文主位推进模式的特点。研究结果显示,英汉语篇信息结构存在一些差异,比如,英语论文往往呈现多种主位推进模式,更倾向于采用与研究话题相关的名词短语来构建主位链,而汉语论文中主述结构更密集,更倾向于使用非常规主位,采用与研究者相关或指示性的代词和名词来构建主位链,且在多种主位推进模式中缺省主位。这些发现为汉语作者如何尽可能摆脱母语影响,撰写出更符合国际读者信息加工习惯,更易获得国际学术界认可的论文提供一定的参考。     

财务危机预警指标体系及指数构建——来自创业板上市公司的证据

运用主成分分析法筛选指标构建财务危机预警指标体系,该体系包含4个因子9个指标。采用突变级数法编制财务危机预警指数,对我国创业板260家上市公司进行了预警。研究结果表明:创业板上市公司盈利状况和现金流量状况相对较好,偿债能力和营运能力欠佳。最终确定财务预警指数参考临界值为0.743。     

基于功能文体学的大学英语语篇教学研究探析

通过从宏观结构到微观成分的功能文体分析,就大学英语语篇教学研究提供一种多维的理据：对语篇进行宏观结构的分析,有利于掌握其组织机制;而运用情景语境分析和主位推进分析,能对揭示语篇构成的环境因素、语篇的发展脉络起到总领的作用;恰当的衔接手段分析,则可以为读者理解语篇的连贯方式和领会语篇遣词的技巧发挥作用。     

论西域民族的发展过程与结合特性

该文着眼世界四大文化圈唯一交汇处、九大语系中五大语系交融处的西域的时间和空间 ,重点历述和阐释了西域古代民族的发生、发展过程 ,从东西南北向西域迁徙的民族互市 ,“打交”、杂居、通婚、相互同化的视角 ,进一步论证了西域诸民族“你中有我 ,我中有你”的结合特性 ,特别从地域上的结合性、生产方式上的结合性 ,人种上的结合性、血缘上的结合性、文化心理上的结合性 5个方面具体印证了今天的“三个离不开”(汉族离不开少数民族 ,少数民族离不开汉族 ,各少数民族之间互相离不开 ) ,是具有中国特色的历史民族关系的必然结果 ,西域民族的结合特性也为我们增强整个中华民族的凝聚力提供了极强的可信性     

话语分析中的主谓推进模式

在话语分析中,不同的分析者对于主位有着不同的认识,拟根据韩礼德对主位的定义,着重探讨主位推进模式在话语分析中的作用,尤其是在书面语篇中的作用。     

Divorce and parity progression following the death of a child: A register-based study from Finland

Most studies that have examined whether a child’s death influences parental relationship stability have used small-scale data sets and their results are inconclusive. A likely reason is that child loss affects not only the risk of parental separation, but also the risk of having another child. Hence parity progression and separation must be treated as two competing events in relation to child loss. The analysis in this paper used Finnish register data from 1971 to 2003, covering over 100,000 married couples whose durations of both first marriage and parenthood could be observed. We ran parity-specific Cox regressions in which process time started from the birth of each additional child. All marriages included women of childbearing age, none of whom had experienced any child death on entering the analysis. We find that child loss only modestly influences the divorce risk, whereas its effect on the risk of parity progression is considerable.