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Article
Publication date: 9 January 2020

Lei Wang, Yang Cai, Wei-Wei Wang, Run-Zhe Liu, Di Liu, Fu-Yun Zhao and Hanqing Wang

This paper aims to numerically investigate the magnetohydrodynamic (MHD) convection heat transfer of nanofluid inside a differentially heated enclosure with various fin…

Abstract

Purpose

This paper aims to numerically investigate the magnetohydrodynamic (MHD) convection heat transfer of nanofluid inside a differentially heated enclosure with various fin morphologies.

Design/methodology/approach

The fluid flow within the cavity was governed by N-S equations while it within porous medium was solved by the non-Darcy model, called the Darcy–Forchheimer model based on representative element-averaging method. Empirical correlations from experimental data are used to evaluate the effective thermal conductivity and dynamic viscosity. Relevant governing parameters, including thermal Rayleigh number (105-107), Hartmann number (0-50), Darcy number (10−6-10−1), thermal conductivity ratio of porous matrix (1-103), nanoparticles volume fraction (0-0.04) and topology designs of porous fins, are sensitively varied to identify their effects and roles on the fluid flow and heat transfer. Particularly, heatlines are used to investigate the mechanism of heat transport.

Findings

Numerical results demonstrate that the predictions of average Nusselt number are augmented by using more porous fins with high permeability, and this effect becomes opposite in tiny Darcy numbers. Particularly, for high Darcy and Rayleigh numbers, the shortest fins could achieve the best performance of heat transfer. In addition, the prediction of average Nusselt number reduces with an increase in Hartmann numbers. An optimal nanoparticles concentration also exists to maximize heat transfer enhancement. Finally, numerical correlations for the average Nusselt number were proposed as functions of these governing parameters.

Practical implications

Present work could benefit the thermal design of electronic cooling and thermal carriers in nanofluid engineering.

Social implications

Present work could benefit the thermal design of electronic cooling and thermal carriers in nanofluid engineering. In addition, optimum thermal removals could enhance the lifetime of electronics, therefore reducing the cost of energy and materials.

Originality/value

To the best knowledge of authors, there are not any studies considering the synergetic effects of porous fins on MHD convection of nanofluids. Present work could benefit the thermal design of electronic cooling and thermal carriers in nanofluid engineering.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 22 no. 8
Type: Research Article
ISSN: 0961-5539

Keywords

Article
Publication date: 16 January 2017

Yezhuo Li, Yan-An Yao, Junlin Cheng, Yaobin Tian and Ran Liu

The purpose of this paper is to propose an agile assistant robot to be used as a mobile partner with two rotational motions and one translational motion. This robot…

Abstract

Purpose

The purpose of this paper is to propose an agile assistant robot to be used as a mobile partner with two rotational motions and one translational motion. This robot possesses the rolling function and three operating abilities to assistant human beings in the industrial environment.

Design/methodology/approach

The main body of the robot is a typical 4-RSR (where R denotes a revolute joint and S denotes a spherical joint) parallel mechanism. The mechanism can reach any position on the ground by two rolling modes (the equivalent Watt linkage rolling mode and the equivalent 6R linkage rolling mode), and the robot can work as a spotlight or a worktable in operating modes at the target location. The mobility, rolling modes, operating modes and kinematics are analyzed.

Findings

Based on the results of kinematics of this assistant robot, the upper platform of the 4-RSR rolling mechanism has two rotational motions and one translational motion which can be used in the industry. The proposed concept is verified by experiments on a physical prototype.

Practical implications

This paper also discusses the application to industrial cases where cooperation between workers and robots is required.

Originality/value

The work presented in this paper is a novel exploration to apply parallel mechanisms to the field of assistant rolling robots. It is also a new attempt to use the rolling mechanism in the field of mobile operating robots for industry tasks.

Details

Industrial Robot: An International Journal, vol. 44 no. 1
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 26 August 2021

Hai Minh Ngo, Ran Liu, Seifeddine Ben Taieb, Masahiro Moritaka and Susumu Fukuda

Expanding the market share of safe food through a modern retail system has faced a lot of difficulties in Vietnam. Thus, a further understanding of consumer behaviour and…

Abstract

Purpose

Expanding the market share of safe food through a modern retail system has faced a lot of difficulties in Vietnam. Thus, a further understanding of consumer behaviour and loyalty towards such food is essential for food retailers. This study aims at exploring segments of consumer loyalty and its influential factors towards safe food brands in the country.

Design/methodology/approach

Based on a sample of 250 consumers buying safe food in Hanoi city in February 2019, two-step cluster and multinomial logistic regression analyses were applied.

Findings

The results show that four segments of brand loyalty were formed from the interaction between attitudinal and behavioural loyalty as the framework of Dick and Basu (1994), namely, true loyalty, spurious loyalty, latent loyalty and disloyalty. Notably, over 60% of the consumers were in latent loyalty and spurious loyalty, indicating variety-seeking behaviour, multi-brand loyalty or low recognition of the brand. Consumer satisfaction was the most vital motivating consumers to higher loyalty levels. Additionally, brand trust and brand familiarity played significant roles in developing true brand loyalty. An attractive selling store and friendly staff were also important in enhancing brand loyalty.

Originality/value

This study is one of the first to elicit consumer loyalty and identify factors driving the loyalty towards brands of safe food in a developing country like Vietnam.

Details

International Journal of Retail & Distribution Management, vol. 50 no. 4
Type: Research Article
ISSN: 0959-0552

Keywords

Article
Publication date: 2 November 2021

Hai Minh Ngo, Ran Liu, Masahiro Moritaka and Susumu Fukuda

Research on the determinants of consumer behavior toward food with safety certifications in Vietnam remains little. The primary objective of this study is to identify the…

Abstract

Purpose

Research on the determinants of consumer behavior toward food with safety certifications in Vietnam remains little. The primary objective of this study is to identify the factors affecting Vietnamese consumer intention to purchase safely certified vegetables (safe vegetables) based on an extended theory of planned behavior (TPB).

Design/methodology/approach

Using a sample of 361 urban consumers in Hanoi city based on a stratified sampling technique, we applied structural equation modeling (SEM) to test the model.

Findings

The results revealed that the extended TPB succeeded to predict 62% of the variance of intention to purchase safe vegetables. Attitude played the most important role in consumer intention. Notably, the attitude of consumers was the most largely influenced by subjective norms (social effects). Also, subjective norms had a direct effect on intention. Furthermore, consumer trust motivated a favorable attitude to increase purchase intention. The effects of past behavior on intention were verified as direct and indirect through subjective norm and trust combined with attitude. Few socio-demographic variables (e.g. age and education) were found to affect intention indirectly through attitude and subjective norm.

Research limitations/implications

Further research on the relationship between intention and the actual purchase of safe food is needed.

Originality/value

This extends the application of the TPB to predict consumer intention to purchase safely certified food in a developing country like Vietnam by examining both direct and indirect effects of socio-demographic variables, trust and past behavior on intention.

Details

Journal of Agribusiness in Developing and Emerging Economies, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2044-0839

Keywords

Article
Publication date: 23 June 2020

Dzung Dao Dong, Masahiro Moritaka, Ran Liu and Susumu Fukuda

Restructuring swine and pork value chain plays important role in agriculture reformation of Vietnam, the top global pork-lover and swine producer worldwide. This study…

Abstract

Purpose

Restructuring swine and pork value chain plays important role in agriculture reformation of Vietnam, the top global pork-lover and swine producer worldwide. This study aims at investigating the modernization of its entire swine-to-pork value chain.

Design/methodology/approach

This study combines the secondary data and primary data. The secondary data included the publications, procurements, databases from both worldwide and in Vietnam. Primary data comprised the results from field-trips in March 2018 and February 2019 that used in-depth interviews with representative key persons of involving stake-holders.

Findings

The prevalence of contract farming, vertical expansion and conglomerate mergers mainly boost vertical coordination in the industry, which creates three hierarchy paradigms of governance named the full- and semi-vertically integrated model, and the formal coordinating relation institution. Consequently, consolidation has occurred and lead the swine and pork value chain toward modernization.

Research limitations/implications

This study generalizes its first trends of the modernization of the swine-to-pork industry instead of provides its concreted impacts to the involved stakeholders.

Social implications

Swine and pork industries retain historical and socio-political issues in Vietnam. Social problems are going to raise if number of traditional swine producers are failed in the competition from the equipped large-scale producers leading by the giant vertically-integrated contractors.

Originality/value

This study provides the empirical synthesis of the vertical coordination in entitle swine and pork value chain of Vietnam through combining the view of the strategic alliance of the firm and global value chain governance.

Details

Journal of Agribusiness in Developing and Emerging Economies, vol. 10 no. 5
Type: Research Article
ISSN: 2044-0839

Keywords

Article
Publication date: 3 June 2020

Hai Minh Ngo, Ran Liu, Masahiro Moritaka and Susumu Fukuda

While the essential role of brand trust toward consumer decision to purchase food products has been well addressed, there has been still little research on its influential…

Abstract

Purpose

While the essential role of brand trust toward consumer decision to purchase food products has been well addressed, there has been still little research on its influential factors. The primary purpose of this study was to explore factors affecting consumer trust in brands of safe vegetables.

Design/methodology/approach

Structural equation modeling technique was applied to test the hypothetical relationships based on a sample of 361 consumers from a face-to-face interview in the urban areas of Hanoi city, Vietnam, in March and April 2018.

Findings

The authors' findings show that both brand credibility and brand reputation positively affected brand trust. The trustworthiness of a safe vegetable system had a more important role than the competence in building brand trust. While the effects of system trustworthiness on brand trust were found directly and indirectly (through brand credibility), system competence only had an indirect influence on brand trust via brand reputation. Notably, while risk recall directly reduced brand trust, risk information caused a directly positive effect on brand trust. In addition, the impact of food hazards on brand trust was indirect through brand credibility.

Practical implications

Based on our results, the Vietnamese government and stakeholders in the safe vegetable chain should improve brand trust based on fulfilling comprehensive traceability, expanding the brand reputation and providing an appropriate risk communication strategy to the public.

Originality/value

This study is one of the first attempts to model and evaluate factors affecting brand trust in the food sector directly and indirectly.

Details

British Food Journal, vol. 122 no. 9
Type: Research Article
ISSN: 0007-070X

Keywords

Article
Publication date: 4 March 2014

Xian-jun Liu

It is a very prominent problem that Chinese universities lack school-running characteristics. In the past ten years, because of undergraduate teaching assessment…

484

Abstract

Purpose

It is a very prominent problem that Chinese universities lack school-running characteristics. In the past ten years, because of undergraduate teaching assessment requirements of the Ministry of Education, universities attach great importance to school-running characteristics. What is the reality and how to improve the effectiveness of creating the school-running characteristics of universities? It is a problem that needs to be solved. The purpose of this paper is to discuss these issues.

Design/methodology/approach

Using the survey method, literature study, case studies and other methods, this study reviewed ten years of school-running characteristics construction and explored some laws of creating school-running characteristics.

Findings

This study found although universities in China are beginning to attach great importance to the school-running characteristics, but they are still staying in the summarization of characteristics. School-running characteristics are very rough. Creating school-running characteristics are mainly efforts responding to the superior government. Creating school-running characteristics should be based on category characteristic. Universities need to change in competition and create characteristics within its history and culture. Universities need to refine the core idea of education, develop a big picture and then renew them in the assessment cycle.

Originality/value

The originality of this study was that it put forward some new laws including changing from summarizing to creating its own school-running characteristics, putting category characteristic as the prerequisite and considering the core idea of education as the focus of school-running characteristics. This research will enrich the theory building of higher education research and has some value in promoting the creation of school-running characteristics.

Details

International Journal of Educational Management, vol. 28 no. 3
Type: Research Article
ISSN: 0951-354X

Keywords

Open Access
Article
Publication date: 9 November 2018

Monsurat Ayojimi Salami and Razali Haron

The purpose of this paper is to examine the pricing efficiency of the Malaysian crude palm oil (CPO) market before and after the structural break. This study uses the…

2876

Abstract

Purpose

The purpose of this paper is to examine the pricing efficiency of the Malaysian crude palm oil (CPO) market before and after the structural break. This study uses the daily closing price of CPO and CPO futures (CPO-F) for the period ranging from June 2009 to August 2016 while taking structural breaks into account.

Design/methodology/approach

In this study, symmetric and asymmetric long-run relationship model are employed, such as the Johansen cointegration, VECM, TAR and M-TAR models, to examine the impact of structural breaks on the pricing efficiency of the Malaysian CPO market.

Findings

This finding establish that Malaysian CPO price is efficient before and after the structural break. The consistent efficiency of the Malaysian CPO market supports the trading of the CPO-F in Globex and the use of Malaysian CPO pricing as the reference price. This study establishes that a structural break in the Malaysian CPO price series does not affect the pricing efficiency of the market.

Research limitations/implications

This study shows that using Malaysian CPO price as a reference price is sustainable even in the event of a structural break. Therefore, market participants in the Malaysian CPO market have less to worry about the CPO price as it supports the weak form of efficiency. Price deviation in the short run may not lead to arbitrage profit as transaction cost may not be covered.

Practical implications

This study implies that if there is distortion in the price due to shocks, both manufacturers and producers need to hedge their positions in the futures market (subject to their positions in the underlying market). By entering into the futures market, pricing is locked in advance; hence, price risk is eliminated. Such a distortion could also affect the efficiency of the CPO price, therefore this study also addresses the issue of efficiency of the local CPO market.

Originality/value

Previous studies on Malaysian CPO pricing efficiency did not take the effect of structural break into consideration, making it difficult for these studies to show consistency in the efficiency of the Malaysian CPO market.

Details

Journal of Capital Markets Studies, vol. 2 no. 2
Type: Research Article
ISSN: 2514-4774

Keywords

Article
Publication date: 6 March 2017

Bernard Lamien, Leonardo A.B. Varon, Helcio R.B. Orlande and Guillermo E. Elicabe

The purpose of this paper is to focus on applications related to the hyperthermia treatment of cancer, with heating imposed either by a laser in the near-infrared range or…

Abstract

Purpose

The purpose of this paper is to focus on applications related to the hyperthermia treatment of cancer, with heating imposed either by a laser in the near-infrared range or by radiofrequency waves. The particle filter algorithms are compared in terms of computational time and solution accuracy.

Design/methodology/approach

The authors extend the analyses performed in their previous works to compare three different algorithms of the particle filter, as applied to the hyperthermia treatment of cancer. The particle filters examined here are the sampling importance resampling (SIR) algorithm, the auxiliary sampling importance resampling (ASIR) algorithm and Liu & West’s algorithm.

Findings

Liu & West’s algorithm resulted in the largest computational times. On the other hand, this filter was shown to be capable of dealing with very large uncertainties. In fact, besides the uncertainties in the model parameters, Gaussian noises, similar to those used for the SIR and ASIR filters, were added to the evolution models for the application of Liu & West’s filter. For the three filters, the estimated temperatures were in excellent agreement with the exact ones.

Practical implications

This work may help medical doctors in the future to prescribe treatment protocols and also opens the possibility of devising control strategies for the hyperthermia treatment of cancer.

Originality/value

The natural solution to couple the uncertain results from numerical simulations with the measurements that contain uncertainties, aiming at the better prediction of the temperature field of the tissues inside the body, is to formulate the problem in terms of state estimation, as performed in this work.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 27 no. 3
Type: Research Article
ISSN: 0961-5539

Keywords

Article
Publication date: 1 April 1994

Xinyi Xu

People's conciliation is a grass‐roots effort for conflict management in China. It settles civil disputes without characterizing them as conflicts between blameworthy…

Abstract

People's conciliation is a grass‐roots effort for conflict management in China. It settles civil disputes without characterizing them as conflicts between blameworthy adversaries. It does not take legal effect. But with support from the people's court and government, it is generally honored as an institution to maintain and promote mutual confidence and reciprocal relations among rural villagers, urban residents, and work unit employees. This paper attempts to provide a comprehensive description and analysis of people's conciliation. The origin, development, and organization are approached in relation to conciliation in Chinese history as well as other forms of intervention such as self‐conducted, lawyer‐assisted, administrative, and judicial conciliation. Case variety, principle, prohibition, strategy, procedure, and conciliator training are examined Illustrative cases are provided. Ideological and institutional aspects are analyzed in light of Maoism, political economy, culture and community, and public attitude in China.

Details

International Journal of Conflict Management, vol. 5 no. 4
Type: Research Article
ISSN: 1044-4068

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