分类： 管理学 >> 管理学其他学科 提交时间： 2021-01-18
摘要： Due to the destruction of aquatic ecology and pollution of the water environment, policy formulation needs to pay more attention to factors other than economic benefits. Past research mainly relied on the average propagation lengths (APL) of wastewater discharge to empirically analyze the wastewater propagation between sectors. The hub sectors of wastewater discharge, which are densely-connected to other sectors, play key roles in reflecting wastewater discharge or wastewater treatment in the overall economic system. However, there is current ambiguity deficiency in analytic results of economic hubs and transmission mechanisms of wastewater discharge. At the same time, analyzing the transmission mechanism of wastewater discharge, proposing wastewater management and containment strategies are essential to sustainable development of water resource. This paper calculates the wastewater discharge APL based on the compiled sequential water input-occupancy-output tables of 49 sectors for 2002, 2007, 2012 and 2017 in China. Then, we introduce more broadly marginal dependence linkages into APL. A coupled model named APL-HCG (APL with hub covariance graph) is proposed to analyze the hub wastewater discharge sectors and hub propagation chains overall. The results illustrate the evolutionary pattern of the hub sectors of wastewater discharge and the transmission mechanism implicit in the key wastewater propagation chains nationwide from 2002 to 2017.
分类： 语言学及应用语言学 >> 语言学及应用语言学 提交时间： 2021-01-18
摘要： 本文详细地梳理了人类语音起源和演化的研究成果，为对语音起源和演化感兴趣的学者和研究生提供了大量有关的研究文献，并对前人在这个领域里的研究进行了初步的评述。
分类： 心理学 >> 认知心理学 提交时间： 2021-01-18
摘要： 当人们与搭档组成社会群体一起协作讨论某些已经发生的事件或经验时，该社会群体中的成员关系对协作提取成绩的影响仍不明确。本研究通过两项实验，分别使用语词词单和情景故事作为实验材料，考察成员关系（关系类型和关系时长）对协作提取成绩的影响。研究结果表明，当记忆的材料为语词词单时，青年陌生组出现了协作抑制；而当记忆的材料为情景故事时，青年夫妻和老年夫妻组均出现了协作促进。此外，老年夫妻在协作提取情景故事的过程中使用的有效交流策略更多，且这些有效交流策略的使用与更高的协作提取成绩有关。该结果支持了具有长时亲密关系的老年夫妻之间“交互记忆系统”对协作促进的关键作用，为理解成员关系对协作提取成绩的影响提供了全面的证据。
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