Influence of Cultural Orientations on Electronic Word-of-Mouth (eWOM) in Social Media

This study explores how horizontal/vertical individualism and collectivism (HVIC) orientations influence electronic word-of-mouth (eWOM) (i.e., opinion leadership and opinion seeking) in social media. Online survey panel data through Amazon MTurk were collected from American social media users to address the research purpose. The results, using the structural equation modeling, show that the paths from horizontal individualism to opinion leadership, vertical individualism to opinion leadership and opinion seeking, horizontal collectivism to opinion leadership, and vertical collectivism to opinion leadership and opinion seeking were significant. This study provides theoretical and managerial implications regarding the influence of HVIC orientations on eWOM in social media.     

Effects of periodic carbohydrate ingestion on endurance and cognitive performances during a 40-km cycling time-trial under normobaric hypoxia in well-trained triathletes

The purpose of this study was to examine CHO ingestion on a cognitive task using a field-simulated time-trial (TT) under hypoxia in well-trained triathletes. Ten male triathletes (age: 22.1 ± 1.1 years; VO₂max: 59.4 ± 1.4 ml/kg/min) participated in this double-blind/crossover/counter-balanced design study. Participants completed 3 TT trials: 1) normoxic placebo (NPLA; FiO₂ = 20.9%), 2) hypoxic placebo (HPLA; FiO₂ = 16.3%), and 3) hypoxic CHO (HCHO; 6% CHO provided as 2 ml/kg/15 min; FiO₂ = 16.3%). During the TT, physiological responses (SpO₂, HR, RPE, and blood glucose/lactate), cognitive performance, and cerebral haemodynamics were measured. Hypoxia reduced TT performance by ~3.5–4% (p < 0.05), but CHO did not affect TT performance under hypoxia. For the cognitive task, CHO slightly preserved exercise-induced cognitive reaction speed but did not affect response accuracy during hypoxic exercise. However, CHO did not preserve the decreased Hb-Diff (cerebral blood flow, CBF) and increased HHb in the prefrontal lobe (p < 0.05) during hypoxic exercise, and CHO failed to preserve hypoxia-suppressed prefrontal CBF and tissue oxygen saturation. In conclusion, the present study demonstrates that CHO is effective in sustaining reaction speed for a cognitive task but not promoting TT performance during hypoxic exercise, which would be important for strategy-/decision-making when athletes compete at moderate high-altitude.     

我国农村体育精准扶贫改革路径分析

为了丰富户外用品上市公司的评价研究,提升企业的经营绩效,以我国户外用品6家上市公司2016年度财务数据为样本,采用熵权法从偿债能力、运营能力、盈利能力和成长能力四个纬度,对其进行了综合评价。结果显示：（1）公司经营结构中,偿债能力所占的权重最大,运营能力次之,盈利能力排名第三,成长能力所占权重最小;（2）6家公司中,4项一级指标的评分存在明显的两极分化现象。其中,三夫户外的偿债能力最强,牧高笛最弱;牧高笛的运营能力和盈利能力最突出,三夫户外的运营能力和嘉麟杰的盈利能力比较薄弱;中潜股份的成长能力最优秀,浙江永强成长能力最小;（3）综合实力强弱顺序依次为探路者、三夫户外、牧高笛、中潜股份、嘉麟杰、浙江永强。     

中压混合型模块化多电平变换器的载波移相调制策略

由于半桥子模块与全桥子模块的载波移相调制策略不同,两者混合而成的模块化多电平变换器(modular multilevel converter, MMC)不能直接沿用原来的调制策略;在船舶中压直流电力系统中,由于变换器模块数较少,交流输出电压的波形质量相对较差。基于上述原因,通过载波相位角的合理配置,提出一种改进型载波移相调制策略。该策略不仅能够增加交流输出电压的电平数,而且不局限于某种特定的拓扑结构。通过仿真验证其有效性和通用性,验证结果显示它是一种适用于中压混合型MMC的通用调制策略。     

Injectable hybrid inorganic nanoscaffold as rapid stem cell assembly template for cartilage repair

Cartilage injuries are often devastating and most cannot be cured because of the intrinsically low regenerative capacity of cartilage tissues. Although stem-cell therapy has shown enormous potential for cartilage repair, the therapeutic outcome has been restricted by low survival rates and poor chondrocyte differentiation in vivo. Here, we report an injectable hybrid inorganic (IHI) nanoscaffold that facilitates fast assembly, enhances survival and regulates chondrogenic differentiation of stem cells. IHI nanoscaffolds that strongly bind to extracellular matrix (ECM) proteins assemble stem cells through synergistic 3D cell–cell and cell–matrix interactions, creating a favorable physical microenvironment for stem-cell survival and differentiation in vitro and in vivo. Additionally, chondrogenic factors can be loaded into nanoscaffolds with a high capacity, which allows deep, homogenous drug delivery into assembled 3D stem-cell-derived tissues for effective control over the soluble microenvironment of stem cells. The developed IHI nanoscaffolds that assemble with stem cells are injectable. They also scavenge reactive oxygen species and timely biodegrade for proper integration into injured cartilage tissues. Implantation of stem-cell-assembled IHI nanoscaffolds into injured cartilage results in accelerated tissue regeneration and functional recovery. By establishing our IHI nanoscaffold-templated 3D stem-cell assembly method, we provide a promising approach to better overcoming the inhibitory microenvironment associated with cartilage injuries and to advance current stem-cell-based tissue engineering.     

降水对蔬菜价格的冲击效应——以广州为例

降水对蔬菜价格波动有重要影响,分析降水的蔬菜价格冲击效应对菜价预测及市场供需调整具有重要意义.本文首先构建了一个包含降水因素的蔬菜供需动态模型,揭示逐日降水对菜价的影响机制,并阐明了降水对不同蔬菜冲击效应存在异质性的原因;然后基于广州市2004-2018年逐日的菜心、生菜和豆角3种蔬菜零售价格数据及降水数据,采用VAR...     

美国在网络主权问题上的立场变化及启示

[目的/意义]在网络空间这个新颖而又无处不在的领域中,主权原则如何运作一直是国家实践和学界理论研究中的硬核问题。厘清美国在该问题上的立场变化对我国参与网络空间国际治理具有积极意义。[方法/过程]利用历史分析法、文献研究法和对比分析法对美国《情报活动中的国际法律问题评估》(1999年)、《网络行动国际法塔林手册2.0》和《在军事行动中使用网络能力的国际法框架》(2017年)进行法律考察。[结果/结论]研究表明,为应对美国在网络主权问题上的立场转变,我国应坚持领土主权原则的拘束力,平等地尊重各国网络主权,并积极参与网络空间国际规则制定的实践,推动网络空间命运共同体理念的国际法构建。