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1 – 10 of 165
Article
Publication date: 29 October 2021

Quan Lin, Wanchao Guan and Nana Zhang

This study aims to examine the consequences of work–family conflict and explore the mechanism by which it influences organizational citizenship behavior from the perspective of…

1189

Abstract

Purpose

This study aims to examine the consequences of work–family conflict and explore the mechanism by which it influences organizational citizenship behavior from the perspective of changes in and preservation of family well-being (emotional resources).

Design/methodology/approach

Work–family conflict has always been an important research topic in the field of organizational behavior; scholars have studied the relationship between it and organizational citizenship behavior from different perspectives. To better understand the mechanism of work–family conflict on organizational citizenship behavior, we use a longitudinal design and analyze the multi-stage matching data of 209 employees and their superiors from six cities in southern China. The authors construct a theoretical model based on the conservation of resources theory to explore the mechanism by which work–family conflict influences organizational citizenship behavior when taking employees’ family well-being as a mediator and work–family segmentation preference as the boundary condition.

Findings

Work–family conflict has a significant negative effect on family well-being and this effect is moderated by work–home segmentation preferences. Work–family conflict also has a significant indirect effect on organizational citizenship behavior through family well-being and this indirect effect is enhanced by an increase in the level of preference for work–home segmentation.

Originality/value

This study enriches our knowledge of the moderating variables in the study of work–family relationships from the perspective of individual personality traits. It also provides a new perspective for the study of such relationships in the context of Chinese family culture.

Details

International Journal of Conflict Management, vol. 33 no. 1
Type: Research Article
ISSN: 1044-4068

Keywords

Article
Publication date: 5 January 2023

Dongsheng Yuan, Zhonggang Yin, Shuhong Wang, Nana Duan and Yanqing Zhang

This paper aims to propose a novel multiple transient modeling scheme for the 12-pulse phase-shifting reactor (PSR) rectifier to enhance the efficiency of full-cycle design…

Abstract

Purpose

This paper aims to propose a novel multiple transient modeling scheme for the 12-pulse phase-shifting reactor (PSR) rectifier to enhance the efficiency of full-cycle design evaluation.

Design/methodology/approach

The detailed time-domain method is adopted to model the rectifier at the behavioral layer. The diode bridges/transformer model at the architecture layer is established by using the switch function and Park transformation. The frequency domain model at the functional layer is derived with the time-varying Fourier decomposition and frequency-shifting. At the component layer, the magneto-thermal characteristics of the rectifier are analyzed with field-circuit and magnetic-thermal coupling methods. A computer-aided design program integrating multiple modeling is also developed for industrial product design.

Findings

The function layer modeling is preferred in the initial design stage, making up for the lack of modeling accuracy at the architectural layer and the lack of modeling rapidity at the behavioral layer. The component modeling is irreplaceable for the detailed evaluation in the latter design stage. The multiple modeling scheme based on the four-layer modeling helps the designers achieve high-quality products with a short development cycle.

Originality/value

The singular transient modeling cannot cover the needs of different stages in the full-cycle design evaluation. This paper fills this gap with a novel multiple modeling scheme. Meanwhile, the proposed multiple modeling scheme and developed computer-aided design program provide a great convenience for full cycle design evaluation of the 12-pulse PSR rectifier.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 42 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 26 October 2021

Yongliang Wang, Nana Liu, Xin Zhang, Xuguang Liu and Juan Wang

Simultaneous hydrofracturing of multiple perforation clusters in vertical wells has been applied in the stimulation of hydrocarbon resources reservoirs. This technology is…

Abstract

Purpose

Simultaneous hydrofracturing of multiple perforation clusters in vertical wells has been applied in the stimulation of hydrocarbon resources reservoirs. This technology is significantly impeded due to the challenges in its application to the multilayered reservoirs that comprise multiple interlayers. One of the challenges is the accurate understanding and characterization of propagation and deflection of the multiple hydraulic fractures between reservoirs and embedded interlayers.

Design/methodology/approach

Numerical models of the tight multilayered reservoirs containing multiple interlayers were established to study hydrofracturing of multiple perforation clusters and its influencing factors on unstable propagation and deflection of hydraulic fractures. Brittle and plastic multilayered reservoirs fully considering the influences of different in situ stress ratio and physical attributes for reservoir and interlayer strata on propagations of hydraulic fractures were investigated. The combined finite element–discrete element method and mesh refinement strategy were adopted to guarantee the accuracy of stress solutions and reliability of fracture path in computation.

Findings

Results show that the shear stress fields between adjacent multiple hydraulic fractures are superposed to cause fractures deflection. Stress shadows induce the shielding effects of hydraulic fractures and inhibit fractures growth to emerge unstable propagation behaviors, and a main single fracture and several minor fractures develop. As the in situ stress ratio increases, hydraulic fractures more easily deflect toward the direction of maximum in situ stress, and stress shadow and mutual interaction effects between them are intensified. Compared to brittle reservoir, plastic-enhanced reservoir may limit fracture growth and cannot form long fracture length; nevertheless, plastic properties of reservoir are prone to induce more microseismic events with larger magnitude.

Originality/value

The obtained fracturing behaviors and mechanisms based on engineering-scale multilayered reservoir may provide effective schemes for controlling and estimating the unstable propagation of multiple hydraulic fractures.

Article
Publication date: 21 February 2024

Shuliu Wang, Qianqian Liu, Jin Wang, Nana Chen, JunHang Chen, Jialiang Song, Xin Zhang and Kui Xiao

This study aims to investigate the role of aluminium (Al) in marine environment and the corrosion mechanism of galvalume coatings by conducting accelerated experiments and data…

Abstract

Purpose

This study aims to investigate the role of aluminium (Al) in marine environment and the corrosion mechanism of galvalume coatings by conducting accelerated experiments and data analysis.

Design/methodology/approach

Samples were subjected to accelerated corrosion for 136 days via salt spray tests to simulate the natural conditions of marine environment and consequently accelerate the experiments. Subsequently, the samples were examined using various test methods, such as EDS, scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS), and the obtained data were analysed.

Findings

Galvalume coatings comprised interdigitated zinc (Zn)-rich and dendritic Al-rich phases. Corrosion was observed to begin with a Zn-rich phase. The primary components of the corrosion product film were Al2O3 and Zn5(OH)8Cl2·H2O. It was confirmed that the role of Al was to form a dense protective film, thereby successfully blocking the entry of corrosive media and protecting the iron substrate.

Originality/value

This study provides a clearer understanding of the corrosion mechanism and kinetics of galvalume coatings in a simulated marine environment. In addition, the role of Al, which is rarely mentioned in the literature, was investigated.

Details

Anti-Corrosion Methods and Materials, vol. 71 no. 3
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 6 December 2024

Mega Fariziah Nur Humairoh, Utami Widiati, Eva Nikmatul Rabbianty and Yazid Basthomi

Digital multimodal composing (DMC) has received considerable attention in English as a Foreign Language (EFL) classrooms. While empirical studies on DMC have been widely…

Abstract

Purpose

Digital multimodal composing (DMC) has received considerable attention in English as a Foreign Language (EFL) classrooms. While empirical studies on DMC have been widely conducted, there is a scarcity of research specifically examining the experience of pre-service English teachers in employing DMC during their teaching practicum. They might be familiar with DMC concepts, yet their beliefs about implementing DMC-mediated language teaching in classroom settings is worth further investigation. To fill this gap, this study aims to investigate the perspectives of three pre-service English teachers on DMC-mediated language teaching during their teaching practicum program.

Design/methodology/approach

This study employed a case study design and was conducted in a state Islamic university in East Java Province, Indonesia. A semi-structured interview was conducted with three pre-service English teachers to collect data about the beliefs of pre-service English teachers in implementing DMC in their teaching practicum. Data were analyzed through thematic analysis.

Findings

From the analysis, the study unveils three important findings: (1) pre-service teachers' awareness of implementing DMC in English classrooms, (2) pre-service teachers' pedagogical preference for DMC projects and (3) pre-service teachers' perceived challenges in teaching through DMC.

Originality/value

The study suggests that equipping pre-service teachers with adequate pedagogical competence in DMC will enhance their capacity for technological pedagogical and content knowledge (TPACK).

Details

Journal of Applied Research in Higher Education, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2050-7003

Keywords

Abstract

Details

Creating Shared Value to get Social License to Operate in the Extractive Industry
Type: Book
ISBN: 978-1-83909-924-3

Article
Publication date: 27 January 2023

Yongliang Wang and Nana Liu

The unstable dynamic propagation of multistage hydrofracturing fractures leads to uneven development of the fracture network and research on the mechanism controlling this…

Abstract

Purpose

The unstable dynamic propagation of multistage hydrofracturing fractures leads to uneven development of the fracture network and research on the mechanism controlling this phenomenon indicates that the stress shadow effects around the fractures are the main mechanism causing this behaviour. Further studies and simulations of the stress shadow effects are necessary to understand the controlling mechanism and evaluate the fracturing effect.

Design/methodology/approach

In the process of stress-dependent unstable dynamic propagation of fractures, there are both continuous stress fields and discontinuous fractures; therefore, in order to study the stress-dependent unstable dynamic propagation of multistage fracture networks, a series of continuum-discontinuum numerical methods and models are reviewed, including the well-developed extended finite element method, displacement discontinuity method, boundary element method and finite element-discrete element method.

Findings

The superposition of the surrounding stress field during fracture propagation causes different degrees of stress shadow effects between fractures and the main controlling factors of stress shadow effects are fracture initiation sequence, perforation cluster spacing and well spacing. The perforation cluster spacing varies with the initiation sequence, resulting in different stress shadow effects between fractures; for example, the smaller the perforation cluster spacing and well spacing are, the stronger the stress shadow effects are and the more seriously the fracture propagation inhibition arises. Moreover, as the spacing of perforation clusters and well spacing increases, the stress shadow effects decrease and the fracture propagation follows an almost straight pattern. In addition, the computed results of the dynamic distribution of stress-dependent unstable dynamic propagation of fractures under different stress fields are summarised.

Originality/value

A state-of-art review of stress shadow effects and continuum-discontinuum methods for stress-dependent unstable dynamic propagation of multiple hydraulic fractures are well summarized and analysed. This paper can provide a reference for those engaged in the research of unstable dynamic propagation of multiple hydraulic structures and have a comprehensive grasp of the research in this field.

Details

Engineering Computations, vol. 40 no. 1
Type: Research Article
ISSN: 0264-4401

Keywords

Open Access
Article
Publication date: 27 April 2023

Frank Nana Kweku Otoo, Manpreet Kaur and Nissar Ahmed Rather

Internal control systems are critical to an organization's efficiency and promotes the adherence to norms and rules. The purpose of this study is to evaluate the impact of…

16393

Abstract

Purpose

Internal control systems are critical to an organization's efficiency and promotes the adherence to norms and rules. The purpose of this study is to evaluate the impact of internal control systems on banking industry effectiveness.

Design/methodology/approach

Data were collected from 15 commercial and 20 rural banks. The hypothesized relationships were supported by the data. A structural equation modeling was applied in testing the conceptual model and hypothesis. Confirmatory factor analysis was conducted to establish validity and reliability of the dimensions.

Findings

The results show that organizational effectiveness was significantly impacted by three dimensions of internal control systems: control activities, control environments and risk assessment. However, the impact of monitoring of control on organizational effectiveness was not significant. The results also show a nonsignificant impact of information and communication on organizational effectiveness.

Research limitations/implications

Since the current study concentrated on the banking sector with its distinct characteristics, the generalizability of the conclusions may be limited.

Practical implications

The study's findings may aid decision-makers and stakeholders in the adoption, designing and implementation of proactive internal control system to enhance operational efficiency, effectiveness and competitive advantage.

Originality/value

The study advances the literature by empirically evidencing that internal control systems impact organizational effectiveness.

Details

LBS Journal of Management & Research, vol. 21 no. 1
Type: Research Article
ISSN: 0972-8031

Keywords

Article
Publication date: 9 May 2018

Andrea Nana Ofori-Boadu, Richard Yeboah Abrokwah, Spero Gbewonyo and Elham Fini

The purpose of this paper is to investigate the effect of an admixture, Swine-waste Bio-char (SB), on the water absorption characteristics of cement pastes.

Abstract

Purpose

The purpose of this paper is to investigate the effect of an admixture, Swine-waste Bio-char (SB), on the water absorption characteristics of cement pastes.

Design/methodology/approach

The effect of SB percentages, heat treatment temperatures, water/binder ratios, and age on the water absorption percentages (WAPs) of SB modified cement pastes were investigated using scanning electron microscopy-energy dispersive spectra, FTIR, Brunauer-Emmett-Teller, and laboratory experiments.

Findings

The WAPs of cement pastes with SBs produced at the low treatment temperature (LTT) of 340°C and 400°C were significantly lower (p<0.01) than pastes with SBs produced at the high treatment temperature (HTT) of 600°C and 800°C. This was attributed primarily to the more dominant presence of hydrophobic alkyl surface groups from non-volatilized matter in LTT-SBs. This had also resulted in lower surface areas and pore volumes in LTT-SBs. As a result of the volatilization of these labile hydrophobic groups at HTT, HTT-SBs were more hydrophilic and had higher surface areas and pore volumes. Consequently, HTT-SB pastes had higher WAPs and no significant differences (p<0.05) existed between HTT-SB pastes and control pastes. Also, low water/binder ratios and aging reduced water absorption of SB modified cement pastes.

Practical implications

LTT-SBs reduce water absorption and could reduce concrete deterioration; and as such, associated building repair, maintenance, and adaptation costs. Notably, reductions in concrete water absorption will extend the service life of concrete buildings and infrastructures, particularly in unfavorable environmental conditions. The observed benefits are tempered by the current lack of information on the effects of SB on compression strength, workability, and other durability properties.

Social implications

SB utilization in concrete buildings will enhance swine-waste disposal and reduce negative environmental impacts on swine farming communities; consequently, improving their quality of life.

Originality/value

Current bio-char research is focused on plant-derived bio-char toward soil remediation and contaminant removal, with very limited applications in concrete. This research advances knowledge for developing livestock-derived bio-char, as a PCRM, toward more sustainable and durable concrete structures.

Details

International Journal of Building Pathology and Adaptation, vol. 36 no. 3
Type: Research Article
ISSN: 2398-4708

Keywords

1 – 10 of 165