bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical analysis of natural convection heat transfer and entropy generation in a porous quadrantal cavity
Authors: Dutta Shantanu , Biswas Arup Kumar , Pati Sukumar 
Published: August 2019

Purpose
The purpose of this paper is to analyze the natural convection heat transfer and irreversibility characteristics in a quadrantal porous cavity subjected to uniform temperature heating from the bottom wall.

Design/methodology/approach
Brinkmann-extended Darcy model is used to simulate the momentum transfer in the porous medium. The Boussinesq approximation is invoked to account for the variation in density arising out of the temperature differential for the porous quadrantal enclosure subjected to uniform heating on the bottom wall. The governing transport equations are solved using the finite element method. A parametric study is carried out for the Rayleigh number (Ra) in the range of 103 to 106 and Darcy number (Da) in the range of 10−5-10−2.

Findings
A complex interaction between the buoyant and viscous forces that govern the transport of heat and entropy generation and the permeability of the porous medium plays a significant role on the same. The effect of Da is almost insignificant in dictating the heat transfer for low values of Ra (103, 104), while there is a significant alteration in Nusselt number for Ra ≥105 and moreover, the change is more intense for larger values of Da. For lower values of Ra (≤104), the main contributor of irreversibility is the thermal irreversibility irrespective of all values of Da. However, the fluid friction irreversibility is the dominant player at higher values of Ra (=106) and Da (=10−2).

Practical implications
From an industrial point of view, the present study will have applications in micro-electronic devices, building systems with complex geometries, solar collectors, electric machinery and lubrication systems.

Originality/value
This research examines numerically the buoyancy driven heat transfer irreversibility in a quadrantal porous enclosure that is subjected to uniform temperature heating from the bottom wall, that was not investigated in the literature before.
A finite element solver for hypersonic flows in thermo-chemical non-equilibrium, Part II
Authors: Gao Song , Seguin Jory , Habashi Wagdi G. , Isola Dario , Baruzzi Guido 
Published: August 2019

Purpose
This work aims to describe the physical and numerical modeling of a CFD solver for hypersonic flows in thermo-chemical non-equilibrium. This paper is the second of a two-part series that concerns the application of the solver introduced in Part I to adaptive unstructured meshes.

Design/methodology/approach
The governing equations are discretized with an edge-based stabilized finite element method (FEM). Chemical non-equilibrium is simulated using a laminar finite-rate kinetics, while a two-temperature model is used to account for thermodynamic non-equilibrium. The equations for total quantities, species and vibrational-electronic energy conservation are loosely coupled to provide flexibility and ease of implementation. To accurately perform simulations on unstructured meshes, the non-equilibrium flow solver is coupled with an edge-based anisotropic mesh optimizer driven by the solution Hessian to carry out mesh refinement, coarsening, edge swapping and node movement.

Findings
The paper shows, through comparisons with experimental and other numerical results, how FEM + anisotropic mesh optimization are the natural choice to accurately simulate hypersonic non-equilibrium flows on unstructured meshes. Three-dimensional test cases demonstrate how, for high-speed flows, shocks resolution, and not necessarily boundary layers resolution, is the main driver of solution accuracy at walls. Equally distributing the error among all elements in a suitably defined Riemannian space yields highly anisotropic grids that feature well-resolved shock waves. The resulting high level of accuracy in the computation of the enthalpy jump translates into accurate wall heat flux predictions. At the opposite end, in all cases examined, high-quality but isotropic unstructured meshes gave very poor solutions with severely inadequate heat flux distributions not even featuring expected symmetries. The paper unequivocally demonstrates that unstructured anisotropically adapted meshes are the best, and may be the only, way for accurate and cost-effective hypersonic flow solutions.

Originality/value
Although many hypersonic flow solvers are developed for unstructured meshes, few numerical simulations on unstructured meshes are presented in the literature. This work demonstrates that the proposed approach can be used successfully for hypersonic flows on unstructured meshes.
Service failure in higher education institutions
Authors: Msosa Steven Kayambazinthu , Govender Jeevarathnam P. 
Published: August 2019

PurposeProviding quality service is the goal of many service providers and higher education institutions are not exceptional. However, service failure may occur from time to time which may eventually lead to customer dissatisfaction with the service rendered. The purpose of this paper is to examine service failure incidents in higher education.Design/methodology/approachIn this study, three categories of service failure, namely, employee response to service delivery system failure, employee response to customer needs and requests, and unprompted and unsolicited employee actions were used to categorise 45 critical incidents obtained from 30 students at a university of technology.FindingsThe results showed that service delivery system failures account for the biggest number (51 per cent) of service failure incidents captured in this study.Research limitations/implicationsThe critical incident technique which relies on the respondents’ memory to recall service failure incidents was used to collect information. The drawback is that memory can be fallible and students may end up exaggerating service failure incidents.Practical implicationsThis study can assist higher education institutional managers to understand the nature of service failure incidents that lead to student dissatisfaction.Originality/valueThis study is unique as it presents service failure incidents from the developing world and further provides the basis for creation of service recovery strategies.
Wavelet and multiple linear regression analysis for identifying factors affecting particulate matter PM2.5 in Mumbai City, India
Authors: Venkataraman Vivekanand , Usmanulla Syed , Sonnappa Appaiah , Sadashiv Pratiksha , Mohammed Suhaib Soofi , Narayanan Sundaresh S. 
Published: August 2019

Purpose
The purpose of this paper is to identify significant factors of environmental variables and pollutants that have an effect on PM2.5 through wavelet and regression analysis.

Design/methodology/approach
In order to provide stable data set for regression analysis, multiresolution analysis using wavelets is conducted. For the sampled data, multicollinearity among the independent variables is removed by using principal component analysis and multiple linear regression analysis is conducted using PM2.5 as a dependent variable.

Findings
It is found that few pollutants such as NO2, NOx, SO2, benzene and environmental factors such as ambient temperature, solar radiation and wind direction affect PM2.5. The regression model developed has high R2 value of 91.9 percent, and the residues are stationary and not correlated indicating a sound model.

Research limitations/implications
The research provides a framework for extracting stationary data and other important features such as change points in mean and variance, using the sample data for regression analysis. The work needs to be extended across all areas in India and for various other stationary data sets there can be different factors affecting PM2.5.

Practical implications
Control measures such as control charts can be implemented for significant factors.

Social implications
Rules and regulations can be made more stringent on the factors.

Originality/value
The originality of this paper lies in the integration of wavelets with regression analysis for air pollution data.
Time and cost constrained optimal designs of multiple step stress tests under progressive censoring
Authors: Hakamipour Nooshin 
Published: August 2019

Purpose
The purpose of this paper is to consider the general k level step-stress accelerated life test with the Rayleigh lifetime distribution for units subjected to stress under progressive Type-I censoring.

Design/methodology/approach
The parameter of this distribution is assumed to be a log-linear function of the stress, and a tampered failure rate model holds. The progressive Type-I censoring reduces the cost of testing. Due to constrained resources in practice, the test design must be optimized carefully. A numerical study is conducted to illustrate the optimum test design based on several four optimality criteria under the constraint that the total experimental cost does not exceed a pre-specified budget.

Findings
This paper compares unconstrained and constrained optimal k level step-stress test. Based on the results of the simulation study, the cost constraint reduces cost and time of the test and it also, in the most cases, increases the efficiency of the test. Also, the T-optimal design is lowest cost and time for testing and it is found more optimal in both conditions.

Originality/value
In this paper, various optimization criteria for selecting the stress durations have been used, and these criteria are compared together. Also, because of affecting the stress durations on the experimental cost, the author optimize under the constraint that the total experimental cost does not exceed a pre-specified budget. The efficiency of the unconstrained test in comparison with constrained test is discussed.
Understanding the adoption of bike sharing systems
Authors: Gao Shang , Li Ying , Guo Hong 
Published: August 2019

Purpose
This study aims to investigate users’ adoption of bike sharing systems in China.

Design/methodology/approach
This research combined perceived risk factors with existing technology diffusion theories (e.g. technology acceptance model and unified theory of acceptance and use of technology) to develop a research model to examine users’ adoption of bike sharing systems in China. As a result, a research model with 11 hypotheses was developed. The developed research model was empirically tested using data collected from a survey of 298 users in China. Structural equation modeling was used to analyze the collected data.

Findings
The findings indicated that perceived usefulness, facilitating conditions and perceived risks were important determinants to the adoption of bike sharing systems. However, perceived ease of use and social influence did not have significant positive impacts on users’ behavioral intention to use bike sharing systems.

Practical implications
It is important for service providers to dedicate their time and efforts in maintaining and repairing bikes to ensure that the bikes are in a good condition to be used. System providers need to work on good solutions to better protect users’ personal information and location information.

Originality/value
This study is first of its kinds in investigating the adoption of bike sharing systems by combining technology diffusion theories and perceived risk theory in China.
Educating business students to manage for mental health
Authors: Simola Sheldene K. 
Published: August 2019

PurposeThe purpose of this paper is to describe content topics and teaching methods for a new undergraduate course in business administration on managing for workplace mental health. It then discusses a preliminary evaluation of the course.Design/methodology/approachResearch-supported content and teaching methods were developed and implemented.n=18 undergraduates completed pre- and post-course quantitative measures related to course goals, and a qualitative post-course survey about course content and delivery.FindingsAnalysis of pre- and post-course quantitative measures demonstrated significant increases in mental health-related knowledge; other-directed, mental health supportive behaviours; mental health promotion self-efficacy; mental health promotion intentions; and self-compassion; as well as significant decreases in stigmatising attitudes. Effect sizes were moderate to large, indicating usefulness. Qualitative, post-course data indicated that positive aspects of course content were those that enhanced knowledge of mental health conditions; skills for managing workplace mental health concerns; and attitudes towards those suffering from mental illness. Qualitative post-course data indicated that positive aspects of course delivery were specific teaching strategies and teaching qualities.Research limitations/implicationsResults support the continued development and use of a course for business students on managing workplace mental health. Additional, larger scale evaluation would be helpful.Practical implicationsDetailed information is provided about the course structure, content, resources and teaching methods, which could be used in other settings.Social implicationsThe workplace is an important site for early identification and intervention of mental health concerns, regardless of their origin or cause. This research supports the usefulness of training prospective business managers in this regard.Originality/valueCoverage of mental health-related topics with business students has been scant to absent. This project developed, implemented and evaluated a new course.
Secondary school teachers’ experiences of supporting mental health
Authors: Shelemy Lucas , Harvey Kate , Waite Polly 
Published: August 2019

Purpose
Teachers are often the first contact for students with mental health difficulties. They are in an ideal position to identify students who are struggling and frequently support them using different approaches and techniques. The purpose of this paper is to investigate secondary school teachers’ experiences of supporting the mental health of their students.

Design/methodology/approach
Seven secondary school teachers from state-funded schools in the UK participated in face-to-face semi-structured interviews. Interpretative phenomenological analysis was used to understand and structure the data into themes.

Findings
Five superordinate themes emerged from the data analysis: perceived role of teacher, nature of relationship, barriers to helping the child, amount of training and resource, and helplessness and satisfaction. Participants described the lack of training, resource and clarity about their role to be causes of frustration. Internal and environmental factors often influenced participants’ feelings of helplessness.

Research limitations/implications
The findings from this study cannot be readily generalised to the wider population due to the nature of qualitative interviews.

Practical implications
This study has led to a greater understanding of the experiences of teachers within a school setting. It is crucial that mental health training for teachers directly meets their needs and abilities.

Originality/value
This paper finds value in recognising the lived experience and difficulties faced by teachers supporting students’ mental health problems. A theoretical model is presented based on this analysis that can help inform best practice for schools.
Why people commit public procurement fraud? The fraud diamond view
Authors: Rustiarini Ni Wayan , T. Sutrisno , Nurkholis Nurkholis , Andayani Wuryan 
Published: August 2019

PurposeThis paper aims to discuss the factors that cause individuals to commit fraud, especially in the public procurement context. All this time, an empirical review of public procurement fraud has only focused on the macro and micro level, as well as its losses on the country's economy. This paper highlights individuals’ fraudulent behavior from the four elements of the fraud diamond theory, namely, pressure, opportunity, rationalization and capability.Design/methodology/approachThis paper is a literature review that discusses the fraudulent behavior of bureaucrat as a procurement official in the context of public procurement. This review uses fraud diamond theory as its theoretical framework to explain the attributes to do fraud.FindingsPublic procurement is a high-risk area for fraud (corruption), particularly in the government institution. It cannot be denied that the situation factor (pressure and opportunity) will interact with psychological aspects (rationalization) and individual capability to direct the individuals to commit fraud. This study discusses how existing pressure (motivation) and opportunities are used by individuals who have the capability to rationalize their actions. This literature review also endeavors to shed light on the strategy to prevent, detect and control the causes of fraud.Practical implicationsThis paper provides an understanding of regulators, auditors and other employees in recognizing the characteristics and nature of fraud antecedents. This understanding can help prevent various forms of procurement fraud that occur within their organizations. This paper also can be a guideline to assist public sector organizations in designing effective internal control systems to prevent fraud in the process and practice of public procurement.Social implicationsPublic procurement has a central role that enables the government to allocate the budget effectively and efficiently. Compliance in implementing procurement rules and procedures will improve the quality of public services.Originality/valueThere exists relatively little study outlining the factors underlying of bureaucrats’ (procurement official) opportunistic behavior on procurement activities. The authors focused on bureaucrats’ behavior because they have unique positions of power and responsibility of the procurement process. On the one hand, they have a crucial role in serving the public and safeguarding public assets. On the other hand, they have the ability to collaborate with politicians and business actors in corrupt procurement practices. Therefore, the discussion on this topic is very relevant and interesting.
How can WeChat contribute to psychosocial benefits? Unpacking mechanisms underlying network size, social capital and life satisfaction among sojourners
Authors: Pang Hua 
Published: August 2019

Purpose
The purpose of this paper is to systematically unpack whether and how WeChat network size is correlated with perceived social capital and life satisfaction among Chinese overseas students in Germany.

Design/methodology/approach
Based on a web-based survey data collected from 218 sojourners, zero-order correlation analyses and structural equation modeling were separately implemented to tackle the complicated research questions.

Findings
Findings demonstrate that an individual’s WeChat network size significantly and directly influences bridging, bonding and maintained social capital. Importantly, a path model demonstrates that these distinct dimensions of social capital are all significant predictors of life satisfaction. Furthermore, the empirical evidence reveals that bridging, bonding and maintained social capital can mediate the association between network size and well-being outcome.

Research limitations/implications
Theoretically, the paper is an initial attempt contributing to the previous studies on estimating the influence of WeChat friendships on social capital and life satisfaction. Practically, these findings will contribute to a more nuanced understanding of effect of personal network characteristics derived from the dominant media interaction on social connectedness and life quality.

Originality/value
Despite WeChat is immensely prevalent in Mainland China, only few studies have concentrated on the role of WeChat network size in fostering individuals’ social and psychological development. The work provides unique evidence that number of friends on the emerging technology could indirectly benefit sojourners’ satisfaction with life through processes involving diverse categories of social capital in a trans-cultural environment.
Social sustainability in supply chains: a review
Authors: Chiesa Patricio Javier , Przychodzen Wojciech 
Published: August 2019

Purpose
The purpose of this study is to review the development of the socially sustainable supply chain management field.

Design/methodology/approach
The 112 most cited papers in the field until 2017 are analysed using a state-of-the-art structured literature review model borrowed from the accounting field.

Findings
This study highlights the increasing number of publications across the years, the diversity of journals and the type of authors addressing the topic. It reveals that qualitative studies focused on large companies in the garment, food and electronics sectors and on private regulations capture most of the attention, with Asia, Europe and North America being the most scrutinised locations. Drivers and barriers for socially sustainable supply chain management are summarised, clustered and confronted. This study also evaluates how the sustainability and corporate social responsibility concepts are used in the above field and analyses the existing definitions of social sustainability.

Research limitations/implications
This study incites researchers to broaden their studies to diverse sectors and locations, addressing different levels of supply chains with quantitative techniques and clearer conceptual foundations.

Practical implications
This study incites practitioners to further contribute to this scholars-dominated research field, offering their practical insights and perspectives.

Originality/value
This study offers original insights and critiques of the literature, highlighting its gaps and proposing new research avenues for the future.
The mobilising effect of political choice
Authors: HOBOLT SARA B. , HOERNER JULIAN M. 
Published: August 2019

AbstractPolitical choice is central to citizens’ participation in elections. Nonetheless, little is known about the individual‐level mechanisms that link political choice and turnout. It is argued in this article that turnout decisions are shaped not only by the differences between the parties (party polarisation), but also by the closeness of parties to citizens’ own ideological position (congruence), and that congruence matters more in polarised systems where more is at stake. Analysing cross‐national survey data from 80 elections, it is found that both polarisation and congruence have a mobilising effect, but that polarisation moderates the effect of congruence on turnout. To further explore the causal effect of political choice, the arrival of a new radical right‐wing party in Germany, the Alternative for Germany (AfD), is leveraged and the findings show that the presence of the AfD had a mobilising effect, especially for citizens with congruent views.