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ISBN: (纸本)9787557694739

摘要： From a socio-cultural perspective, language offers a means for children to communicate with and learn from others through interaction: language is the medium through which young children are provided cognitive, social, and emotional support in interactions with caregivers, siblings, and peers;and children characterized as dual language learners (DLLs) have in common that they receive this developmental support in two different languages. However, due to variations in socioeconomic factors, ethnic/immigration background, and language socialization practices, DLLs display considerable variability in their first- and second-language proficiency (McCabe, Tamis-LeMonda, Bornstein, Cates, Golinkoff, Guerra, Hirsh-Pasek, Hoff, Kuchirko, Melzi, Mendelsohn, Paez & Song, 2013).

关键词： ancient DNA   effective population size   Mediterranean Sea   microsatellites   mitochondrial DNA   Xiphias gladius  

摘要： The genetic diversity of the Mediterranean swordfish (Xiphias gladius Linneus) has not been explored extensively at its easternmost range so far. In this study, modern X. gladius samples from the eastern part of the Mediterranean basin, north of the Aegean Sea (Aegean-2013, n = 26) and the Mediterranean coast of Turkey (***-2013, n = 42) were studied genetically, along with ancient samples from Yenikapi excavation (n = 6). Partial mitochondrial DNA control region sequences (entire sequences, clade I and clade II) were evaluated spatially and temporally together with previously published sequences (Alvarado Bremer et al., Molecular Phylogenetics and Evolution, 2005, 36, 169-187;Vinas et al., ICES Journal of Marine Science, 2010, 67, 1222-1229;Righi et al., Diversity, 2020, 12, 170) from the rest of the Mediterranean Sea. Pair-wise F-ST and pair-wise AMOVA tests showed that, in general, groups of eastern populations and western Mediterranean populations have not genetically differed from each other significantly nearly in the past 20 years. Therefore, the results direct reconsideration of previous descriptions of population sub-structure within the Mediterranean and support high gene flow throughout the region. On the contrary, the results of this study confirmed the existence of genetic diversity differences between western and eastern Mediterranean, with eastern being low. One-tailed permutation tests revealed that theta, which is directly proportional to long-term female effective population size (Ne), decreased significantly (P < 0.05) in both regions over the past two decades. On the Turkish coasts, theta is not significantly different from that of the nearly contemporary eastern Mediterranean population. Nonetheless, theta of the ancient sample was consistently and significantly (P < 0.001) higher than those of the eastern and western Mediterranean populations in clade I and clade II. Furthermore, it contains two mitochondrial haplotypes that are not obs

关键词： Demography   Inflation   Phillips curve  

摘要： Demography accounts for a large share of low frequency inflation variation in 22 countries from 1870 to 2016. The dependent population (young and old) is associated with higher, and the working age population with lower inflation. The relationship is robust across different sub-samples and specifications, including dynamic Phillips curve settings, suggesting that it is not spurious. The observed pattern is broadly consistent with delayed monetary policy responses to demography-induced changes in the natural interest rate. (C) 2021 Elsevier B.V. All rights reserved.

关键词： “互联网+”   统计学专业课程   基本概述   不足之处   具体策略  

摘要： 自从进入21世纪以来,随着我国社会经济建设工作的初步完善,互联网信息技术的全面应用与普及,在经济与互联网的全面催动下,我国已经全面进入“互联网+”时代。统计学专业课程作为我国各大高校所开设众多课程中的基础课程之一,其重要性是不言而喻的。因此,本文基于“互联网+”视域下,主要阐述了统计学专业课程的基本概述,以及当前部分高校统计学专业课程教学过程中存在的不足之处,并简要分析了当前时代背景下统计学专业课程教学改革的具体策略。

关键词： 统计学   大数据时代   数据分析  

摘要： 在当前这个大数据时代下,统计学的运用变的更加的广泛了,特别是当统计学跟大数据结合起来之后,对于统计学的发展有着十分巨大的影响,大数据时代给统计学带来了海量的数据支持,推动了统计学朝着更加多元化的方向去发展,而基于这一点,本文就浅谈在大数据时代下,统计学本身的价值以及其存在的意义,同时浅谈统计学在当前的大数据时代下所面对的一些挑战等等。

关键词： 采血流程改进   血培养污染率   统计学意义  

摘要： 研究采血流程的改进对减少血培养污染率的统计学意义。方法:开展本次研究的过程中,选择我院呼吸内科以及心内科在2018年中送检的血培养样本作为对照组样本并对血培养污染率进行统计;在随后2020年开展采血流程改进之后同年送检的血培养样本作为观察组样本并对血培养污染率进行统计,随后应用小组之间对比的方式来开展本次研究。结果:在对采血流程进行充分的改进之后,小组之间对比的过程中,改进前后血培养污染率差异显著(P<0.05),具有统计学意义。结论:临床中为患者开展血液检查时,通过对采血流程进行改进,可以有效的降低血培养污染率,因此值得在临床中进行推广。

ISBN: (纸本)9787115560285