Search results

The purpose of this study is simulation of of polymer electrolyte membrane fuel cell. Proton-exchange membrane fuel cells are promising power sources for use in power plants and vehicles. These fuel cells provide a high level of energy efficiency at low temperature without any pollution. The convection inside the cell plays a key role in the electrochemical reactions and the performance of the cell. Accordingly, the transport processes in these cells have been investigated thoroughly in previous studies that also carried out functional modeling.

A multi-phase model was used to study the limitations of the reactions and their impact on the performance of the cell. The governing equations (conservation of mass, momentum and particle transport) were solved by computational fluid dynamics (CFD) (ANSYS fluent) using appropriate source terms. The two-phase flow in the fuel cell was simulated three-dimensionally under steady-state conditions. The flow of water inside the cell was also simulated at high-current density.

The simulation results suggested that the porosity of the gas diffusion layer (GDL) is one of the most important design parameters with a significant impact on the current density limitation and, consequently, on the cell performance.

This study was mainly focused on the two-phase analysis of the steady flow in the fuel cell and on investigating the impacts of a two-phase flow on the performance of the cell and also on the flow in the GDL, the membrane and the catalyst layer using the CFD.

Summarises the findings of the British Nutrition Foundation Task Force report Adverse Reactions to Food.

Despite the emergence and strategic importance of project risk management (PRM), its diffusion is limited mainly to large companies, leaving a lack of empirical evidence addressing SMEs. Given the socio-economic importance of SMEs and their need to manage risks to ensure the success of their strategic and innovative projects, this research aims to investigate how to adopt PRM in SMEs with a positive cost–benefit ratio.

This study presents an exploratory and explanatory research conducted through multiple-case studies involving 10 projects performed in Spanish and Italian small and medium-sized enterprises (SMEs).

The results obtained highlight how project features (commitment type, innovativeness, strategic relevance and managerial complexity) and firms' characteristics (sector of activity, production system and access to public incentives) influence PRM adoption, leading to different levels and types of benefits.

The paper offers practical indications about PRM phases, activities, tools and organizational aspects to be considered in different contexts to ensure the project's success and, ultimately, the company's growth and sustainability. Such indications could not be found in the literature.

During hospitalization, children are faced with physical disorders and many psychological challenges. One important factor affecting children is the environmental design of the hospital. The inappropriate design of hospitals may contribute to an increase in fear, anxiety and behavioral disorders. The purpose of this study is to use children’s perspectives to evaluate the importance and impact of effective environmental factors to generate children’s hospital design guidelines.

In this study, children’s desired atmosphere during treatment was examined via 16 drawings and 24 interviews from children at a children’s hospital in Iran.

The encoding of information extracted environmental components such as window view, color, hobby, playing, decorations, family presence, structure of hospital, presence of nurse, furniture, water features, light and green space. The results indicate that children prefer a hospital environment that provides entertainment facilities while also offering design features such as the presence of light, colorful decorations, the existence of green spaces and conditions suitable for their families to be present.

Depending on the location and their living conditions, the children’s prioritization can be different in any society. In addition, the data of this research was descriptive; thus, the conclusions must be considered tentative.

A number of studies focus on the needs of populations in developed countries. This topic has not been investigated in a major way via professionals in non-western countries such as Iran. Thus, the context of this study and present findings can be deemed unique.

To manage cash flow in supply chains, the purpose of this paper is to propose inverse data envelopment analysis (DEA) model.

This paper develops an inverse range directional measure (RDM) model to deal with positive and negative values. The proposed model is developed to estimate input and output variations such that not only efficiency score of decision making unit (DMU) remains unchanged, but also efficiency score of other DMUs do not change.

Given that auto making industry deals with huge variety and volumes of parts, cash flow management is so important. In this paper, inverse RDM models are developed to manage cash flow in supply chains. For the first time, the authors propose inverse DEA models to deal with negative data. By applying the inverse DEA models, managers distinguish efficient DMUs from inefficient ones and devise appropriate strategies to increase efficiency score. Given results of inverse integrated RDM model, other combinations of cash flow strategies are proposed. The suggested strategies can be taken into account as novel strategies in cash flow management. Interesting point is that such strategies do not lead to changes in efficiency scores.

In this paper, inverse input and output-oriented RDM model is developed in presence of negative data. These models are applied in resource allocation and investment analysis problems. Also, inverse integrated RDM model is developed.

This research proposes, building on social exchange theory and the componential theory of creativity, a model of servant leadership to investigate its effect on followers' creativity through the intervening mechanism of climate for creativity in the hospitality  industry, operating in a non-Western context.

The study predicted that climate for creativity will play a significant intervening role in the servant leadership–creativity relationship. The study’s data were collected from 232 employees working in 70 Palestinian hotels. Data were analyzed using structural equation modeling (SEM) analyses along with techniques used to reduce common method bias.

The results revealed the significance of climate for creativity as a partial mediator in the relationship between servant leadership and followers' creativity.

The results might be useful for hotel managers in the context of utilizing servant leadership roles for fostering a creative climate. They might, therefore, consider placing servant leaders as a recruitment agenda priority.

This research is novel in three ways. First, its aim is to enrich the empirical literature on servant leadership, which is still in a maturity stage. Second, even with the research studies that are available, limited analysis is found on how servant leadership can stimulate employees' behaviors in the hospitality industry. Third, the study has been conducted in a non-Western context, in contrast to most servant leadership research studies being carried out in Western countries.