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Article
Publication date: 29 July 2022

Yumei Song, Jianzhang Hao, Changhao Dong, Xizheng Guo and Li Wang

This paper aims to study a multi-level reinjection current source converter (MLR-CSC) that adds attracting properties such as the self-commutation and pulse multiplication…

Abstract

Purpose

This paper aims to study a multi-level reinjection current source converter (MLR-CSC) that adds attracting properties such as the self-commutation and pulse multiplication to the thyristor converter, which is of great significance for increasing the device capacity and reducing current harmonics on the grid side. Particularly, designing advantageous driving methods of the reinjection circuit is a critical issue that impacts the harmonic reduction and operation reliability of the MLR-CSC.

Design/methodology/approach

To deal with the mentioned issue, this paper takes the five-level reinjection current source converter (FLR-CSC), which is a type of the MLR-CSC, as the research object. Then, a method that can fully use combinations of five-level reinjection switching functions based on the concept of decomposition and recombination is proposed. It is worthy to mention that the proposed method can be easily extended to other multi-level reinjection circuits. Moreover, the working principle of the three-phase bridge circuit based on semi-controlled thyristors in the FLR-CSC that can achieve the four-quadrant power conversion is analyzed in detail.

Findings

Finally, the simulation and experimental results of FLR-CSC verify the effectiveness of the proposed reinjection circuit driving method and the operating principle of four-quadrant power conversion in this paper.

Originality/value

The outstanding features of the proposed driving method for FLR-CSC in this paper include combinations of reinjection switching functions that are fully exploited through three simple steps and can be conveniently extended to other multi-level reinjection circuits.

Details

Microelectronics International, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1356-5362

Keywords

Article
Publication date: 20 January 2012

Malin Song, Shuhong Wang, Zhanhao Jiang, Jie Yang and Yumei Wang

With the function of reconstructing and promoting traditional industries in China, logistic service industry (LSI) still consumes a great deal of energy. The purpose of…

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Abstract

Purpose

With the function of reconstructing and promoting traditional industries in China, logistic service industry (LSI) still consumes a great deal of energy. The purpose of this paper is to empirically analyse the relationship between energy consumption of logistics and its influential factors in China, and through this, identify the most important factor and give a significant research of this factor afterwards.

Design/methodology/approach

Using a quantitative analysis of the industry composition of energy consumption and the structure of energy consumption in LSI, the serious condition of China's energy conservation of LSI was found. Correlated analysis and co‐integration analysis were adopted to identify how these factors affected the energy conservation of LSI and how to construct environmental logistics in China.

Findings

The paper found mileage traveled by train is the most important factor of energy consumption in LSI, while traveling miles of highway is the second. The former was negative correlation with the total of energy consumption while the latter was positive correlation.

Research limitations/implications

Because of the deficiency of data in China, this research is based on the data of 30 years, which is not testified as long enough for this research. This would indicate that the conclusions of this paper are approximate values. A closer look should be taken at the effectiveness of some of the other factors suggested in the previous research on this topic.

Practical implications

The paper outlines ways to effectively construct environmental logistics in China which would promote the energy conservation and sustainable development of this country. Since the total consumption of energy in China accounts for a certain proportion of the world, this will benefit other countries as well.

Originality/value

This paper is one of the first of its kind to develop and empirically analyze the relationship between energy consumption of LSI and its influential factors in China. It uniquely contributes towards helping us find approaches to constructing China's environmental logistics and will have far‐reaching implications for other developing countries.

Details

Supply Chain Management: An International Journal, vol. 17 no. 1
Type: Research Article
ISSN: 1359-8546

Keywords

Open Access
Article
Publication date: 24 October 2022

Yumei Luo and Jian Mou

This paper aims that mobile health (mHealth) applications have emerged as a key tool to support public health. However, there are only a few studies examining the…

Abstract

Purpose

This paper aims that mobile health (mHealth) applications have emerged as a key tool to support public health. However, there are only a few studies examining the influences of health-related ascribes on continuance intention to use mHealth apps and how these influences are contingent on gender in the mHealth app using context.

Design/methodology/approach

This study takes the protection motivation theory as a theoretical framework to examine the ordered relationship between threat and coping appraisals and their impacts on continuance intention to use mHealth apps. In addition, this study further extends the literature on gender differences into the mHealth app's context to investigate the moderating role of gender. The suggested hypotheses are confirmed by a structural equation modeling approach and multigroup investigation employing survey data of 345 users of Spring Rain Doctor in China, a typical mHealth app.

Findings

The findings suggest that the impact of perceived disease threat on user's continuance intention is mediated entirely by coping appraisals. Furthermore, the three coping appraisals' impacts are contingent upon gender. Specifically, response efficacy is more crucial for male users in forecasting continuance intention, whereas self-efficacy and response cost have a more salient influence on continuance intention for female users.

Originality/value

This study examines the ordered influences of threat and coping appraisal, moderated by gender, on continuance intention on use mHealth apps. These findings could contribute to relevant theoretical and practical implications.

Details

Journal of Electronic Business & Digital Economics, vol. 1 no. 1/2
Type: Research Article
ISSN: 2754-4214

Keywords

Article
Publication date: 3 May 2022

Julian Givi and Yumei Mu

Gift-givers are often confronted with the possibility of choosing gifts that are inconsistent with their own attitudes (“attitude-inconsistent gifts”). For example, a gun…

Abstract

Purpose

Gift-givers are often confronted with the possibility of choosing gifts that are inconsistent with their own attitudes (“attitude-inconsistent gifts”). For example, a gun opposer may be faced with the possibility of choosing gun paraphernalia as a gift, and a vegetarian might be forced to consider the possibility of choosing a steakhouse gift card as a gift. This study aims to compare givers’ decision-making when they are confronted with the possibility of choosing attitude-inconsistent gifts with their decision-making when they are faced with the possibility of choosing gifts that are neither inconsistent nor consistent with their attitudes (“attitude-neutral gifts”).

Design/methodology/approach

Seven experimental studies test the hypotheses. These studies have participants make decisions as givers and use a variety of gifts, giver-recipient relationships, gifting occasions and dependent variables, as well as both consequential and hypothetical decisions.

Findings

Givers strategically avoid choosing attitude-inconsistent (vs attitude-neutral) gifts, even when they believe that these kinds of gifts are the ones that recipients desire the most. This aversion emerges because givers anticipate that choosing an attitude-inconsistent (vs attitude-neutral) gift would cause them to experience a higher level of psychological discomfort.

Research limitations/implications

This research documents a novel gift-giving phenomenon (givers’ aversion to attitude-inconsistent gifts), one of the most widespread forms of intentional preference-mismatching in gift-giving (givers’ avoidance of attitude-inconsistent gifts when they believe that these kinds of gifts are the ones that recipients desire the most), and a psychological mechanism that has a strong influence on givers’ decision-making but was yet to be explored in the gift-giving literature (givers’ anticipations of psychological discomfort). Collectively, these facets improve the field’s understanding of consumer gift-giving and call into question the assumption that gift-giving is aimed predominantly at pleasing the recipient.

Practical implications

This research suggests that if gift-givers want to be more financially efficient, they should refrain from contemplating the feelings of psychological discomfort that they would experience from choosing an attitude-inconsistent gift and instead focus on selecting the gift that the recipient desires the most. Moreover, it indicates that gift-givers’ tendency to avoid preferred, attitude-inconsistent gifts can have undesirable social and well-being consequences. Finally, it suggests that firms’ bottom lines may be harmed by givers’ aversion to attitude-inconsistent gifts, and that firms selling products that are likely attitude-inconsistent for segments of consumers should think carefully about advertising those products as gifts.

Originality/value

The gift-giving literature has recently documented multiple cases of givers intentionally refraining from choosing the gifts that they believe best match recipients’ preferences. Yet, the present work shows that there was a considerable gap in this segment of the gift-giving literature. Specifically, the present research documents a previously unexplored, but highly common, instance in which intentional preference-mismatching in gift-giving occurs: whenever a potential gift is attitude-inconsistent. Moreover, this work sheds light on a psychological mechanism that plays an important role in givers’ decision-making but was yet to be explored in the gift-giving literature: givers’ anticipated feelings of psychological discomfort.

Details

European Journal of Marketing, vol. 56 no. 5
Type: Research Article
ISSN: 0309-0566

Keywords

Article
Publication date: 3 January 2019

Khaled Amiri, Tarik Hartani and Aziez Zeddouri

The purpose of this paper is to assess the water quality parameters resulting on: First, the flow direction in biofilters (ascending or descending), second, constructed…

Abstract

Purpose

The purpose of this paper is to assess the water quality parameters resulting on: First, the flow direction in biofilters (ascending or descending), second, constructed wetland (CW) with local plant species and third, the combined system for the removal of organic matter and nutrients pollutants from water in arid regions.

Design/methodology/approach

An integrated system is presented and tested in situ with a vertical up-flow and down-flow biofilters. Two configurations schemes are followed by a three separated horizontal subsurface CWs: two planted with Phragmites australis, Typha latifolia and the third unplanted. The methodology is based on a statistical analysis of the collected data.

Findings

The present experiment demonstrated that the wetlands planted with P. australis and T. latifolia showed the highest removal. Moreover, T. latifolia performed better than P. australis for most of the parameters, notably in the first system, whereas the wetland efficiency indicated that P. australis contributed greatly to the removal of TP in the first system and NO3-N in the second system. In general, for the highest removal efficiencies of the combined biofilters and wetlands system, the present study demonstrated that the first system performed better than the second for all the parameters.

Originality/value

The originality of the research is that it compares in situ two biofilter systems: vertical up-flow and down-flow biofilters. To avoid the effects of domestic wastewater that is discharged directly without treatment in the Oued Righ channel or in the lake, this integrated system can be one of the alternatives for wastewater treatment, as it reveals the need to protect aquatic ecosystems in arid regions, and can decrease the risks to human health and the environment.

Details

Management of Environmental Quality: An International Journal, vol. 30 no. 4
Type: Research Article
ISSN: 1477-7835

Keywords

Article
Publication date: 7 June 2021

Deborah J. Milly

This article analyzes recent Japanese efforts to recruit care labor from seven Asian countries to identify the relative contributions to migrants and their respective…

Abstract

Purpose

This article analyzes recent Japanese efforts to recruit care labor from seven Asian countries to identify the relative contributions to migrants and their respective countries' health systems. Besides considering the factors affecting migration from, and benefits to, sending countries, it asks how differences in the role of public and private actors may matter.

Design/methodology/approach

The study uses two stages of analysis. The first uses quantitative and qualitative data for seven countries that send care labor migrants to Japan to identify differences in benefits for individual migrants and health care systems in the sending countries. The second stage examines recent initiatives for funding care worker training in Japan to assess the relative impacts of different public-private cooperative arrangements, especially in terms of Vietnam.

Findings

In addition to general migration policy mechanisms provided by the destination country, bilateral relationships and foreign assistance, along with economic, demographic and health care conditions in the origin countries, contribute to the relative benefits of migration. Among countries supplying care labor to Japan, Vietnam is obtaining the most benefits for its health care system in return.

Originality/value

Responding to central concerns surrounding care labor migration, the article compares across countries sending care workers to a single country. The comparison highlights a constellation of factors that contribute the greatest benefits. The article identifies how different types of public and private relationships can influence this process. The study provides observations applicable to other welfare states developing care labor migration relationships.

Details

International Journal of Sociology and Social Policy, vol. 42 no. 1/2
Type: Research Article
ISSN: 0144-333X

Keywords

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