Yajing Hu, Botong Li, Xinhui Si, Jing Zhu and Linyu Meng
Atherosclerosis tends to occur in the distinctive carotid sinus, leading to vascular stenosis and then causing death. The purpose of this paper is to investigate the effect of…
Abstract
Purpose
Atherosclerosis tends to occur in the distinctive carotid sinus, leading to vascular stenosis and then causing death. The purpose of this paper is to investigate the effect of sinus sizes, positions and hematocrit on blood flow dynamics and heat transfer by different numerical approaches.
Design/methodology/approach
The fluid flow and heat transfer in the carotid artery with three different sinus sizes, three different sinus locations and four different hematocrits are studied by both computational fluid dynamics (CFD) and fluid-structure interaction (FSI) methods. An ideal geometric model and temperature-dependent non-Newtonian viscosity are adopted, while the wall heat flux concerning convection, radiation and evaporation is used.
Findings
With increasing sinus size, the average velocity and temperature of the blood fluid decrease, and the area of time average wall shear stress (TAWSS)with small values decreases. As the distances between sinuses and bifurcation points increase, the average temperature and the maximum TAWSS decrease. Atherosclerosis is more likely to develop when the sinuses are enlarged, when the sinuses are far from bifurcation points, or when the hematocrit is relatively large or small. The probability of thrombosis forming and developing becomes larger when the sinus becomes larger and the hematocrit is small enough. The movement of the arterial wall obviously reduces the velocity of blood flow, blood temperature and WSS. This study also suggests that the elastic role of arterial walls cannot be ignored.
Originality/value
The hemodynamics of the internal carotid artery sinus in a carotid artery with a bifurcation structure have been investigated thoroughly, on which the impacts of many factors have been considered, including the non-Newtonian behavior of blood and empirical boundary conditions. The results when the FSI is considered and absent are compared.
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Xinmin Huang, Lingling Meng, Qufu Wei and Linyu Wang
Nanoscale copper (Cu) films were deposited onto the surface of polyester fabrics with different structures using radio frequency magnetron sputter coating system at room…
Abstract
Purpose
Nanoscale copper (Cu) films were deposited onto the surface of polyester fabrics with different structures using radio frequency magnetron sputter coating system at room temperature. The paper aims to discuss these issues.
Design/methodology/approach
Scanning electron microscopy (SEM) and field emission scanning electron microscopy (FE-SEM) were used to observe the surface morphology of substrates and the structures of the deposited copper particles, respectively. The capillary flow pore instrument was used to measure pore sizes distribution of polyester substrates.
Findings
The experimental results revealed that the fabric structures had a more significant role on the conductivity and electromagnetic shielding effectiveness of samples. The porosity had more apparent effect on ultraviolet transmittance of samples.
Originality/value
The results have some theory values on the development of functional textiles.
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Ning Liu, Linyu Zhou, LiPing Xu and Shuwei Xiang
As the cost of completing a transaction, the green merger and acquisition (M&A) premium paid on mergers can influence whether the acquisition creates value or not. However…
Abstract
Purpose
As the cost of completing a transaction, the green merger and acquisition (M&A) premium paid on mergers can influence whether the acquisition creates value or not. However, studies linking M&A premiums to firm value have had mixed results, even fewer studies have examined the effect of green M&A premiums on bidders’ firm value. The purpose of this paper is to investigate whether and how green M&A premiums affect firm value in the context of China’s heavy polluters.
Design/methodology/approach
Using 323 deals between 2008 and 2019 among China’s heavy polluters, this paper estimates with correlation analysis and multiple regression analysis.
Findings
Green M&A premiums are negatively associated with firm value. The results are more significant when firms adopt symbolic rather than substantive corporate social responsibility (CSR) strategies. Robustness and endogeneity tests corroborate the findings. The negative relation is stronger when acquiring firms have low governmental subsidy and environmental regulation, when firms have overconfident management, when firms are state-owned and when green M&A occurs locally or among provinces in the same region. This study also analyzes agency cost as an intermediary in the relationship between green M&A premium and firm value, which lends support to the agency-view hypothesis.
Originality/value
This study provides systemic evidence that green M&A premiums damage firm value through agency cost channel and the choice of CSR strategies from the perspective of acquirers. These findings enrich the literature on both the economic consequences of green M&A premiums and the determinants of firm value and provide a plausible explanation for mixed findings on the relationship between green M&A premiums and firm value.
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Runhui Lin, Lun Wang, Biting Li, Yanhong Lu, Zhiqiang Qi and Linyu Xie
Blockchain is a technical solution integrating multiple technologies, with the potential to overcome the drawbacks of organizational governance. Given the emergence and prevalence…
Abstract
Purpose
Blockchain is a technical solution integrating multiple technologies, with the potential to overcome the drawbacks of organizational governance. Given the emergence and prevalence of blockchain, its importance for organizational governance has progressively increased. Therefore, this study aims to analyze how blockchain restructure organizational governance.
Design/methodology/approach
This study presents a structured systematic literature review of blockchain-enabled applications across diverse organizational governance models and several case studies to illustrate them. Based on the above analysis, governance mechanisms, transaction upgrading and challenges are proposed.
Findings
Based on the literature review and typical applications, the authors summarize the advances in the research on the theoretical and practical applications of blockchain in organizational governance. We also identify the influence mechanisms of organizational governance and investigate transaction upgrading based on blockchain. Finally, the authors discuss three types of challenges (i.e. administrative, technical and environmental) to the relationship between blockchain and organizational governance. Along with the development of blockchain applications, the impact of blockchain on organizational governance has progressed in both theory and practice. Therefore, these findings will have significant implications for both academics and practitioners.
Originality/value
This paper makes three key theoretical contributions: we review the literature on the impact of blockchain on organizational governance and present typical cases to illustrate it; propose four governance mechanisms for the application of blockchain in organizational governance; and propose an innovating-and-matching-oriented model of transaction upgrading based on blockchain.
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The frequent occurrence of hazards, especially on junior staff in developing countries, is a major setback on project delivery. This is because the safety of the construction…
Abstract
Purpose
The frequent occurrence of hazards, especially on junior staff in developing countries, is a major setback on project delivery. This is because the safety of the construction workers' environment influences their performance. Although a range of literature has addressed safety measures on construction sites, how far is their compliance with personal protective equipment (PPE) on junior staff is yet to receive in-depth studies in Nigeria. Therefore, this study investigated the level of Nigerian construction companies' compliance and proffered possible solutions that intend to improve the implementation of PPE on junior staff.
Design/methodology/approach
The data were collected via observation and face-to-face interviews among the selected companies' staff in Lagos and Abuja. The interview is to determine their perceptions regarding compliance with PPE on construction sites.
Findings
Findings show that compliance with PPE on junior staff, especially the indigenous construction companies, is poor. This is because monitoring and enforcement are lax by government regulatory agencies. Also, findings show that many international construction companies ensure that junior workers obey site safety measures those mitigate the chance of hazard occurrence during construction as a policy.
Research limitations/implications
This paper data collection is limited to Abuja and Lagos, and a phenomenology type of qualitative research was employed, but this does not weaken the robustness. Future research is needed to consider adopting a mixed-methods approach.
Practical implications
As part of this paper's implications, findings recommended that the construction company's safety regulations and policies should be robust and enriched to mitigate site-related hazards via a framework or mechanism, but the government agencies/ministries need to give the enabling direction, strict monitoring and enforcement of PPE on junior staff. This paper intends to stir up the appropriate government authorities for possibly passing the Labour, Safety, Health and Welfare Bill 2012 (updated in 2016) Act into law.
Originality/value
This study demonstrates that the government agencies concern with approval and enforcement of construction site safety needs to reawaken to their responsibilities because of the lax implementation in many sites, especially in indigenous construction sites.