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1 – 10 of 27Damodara Priyanka, Pratibha Biswal and Tanmay Basak
This study aims to elucidate the role of curved walls in the presence of identical mass of porous bed with identical heating at a wall for two heating objectives: enhancement of…
Abstract
Purpose
This study aims to elucidate the role of curved walls in the presence of identical mass of porous bed with identical heating at a wall for two heating objectives: enhancement of heat transfer to fluid saturated porous beds and reduction of entropy production for thermal and flow irreversibilities.
Design/methodology/approach
Two heating configurations have been proposed: Case 1: isothermal heating at bottom straight wall with cold side curved walls and Case 2: isothermal heating at left straight wall with cold horizontal curved walls. Galerkin finite element method is used to obtain the streamfunctions and heatfunctions associated with local entropy generation terms.
Findings
The flow and thermal maps show significant variation from Case 1 to Case 2 arrangements. Case 1 configuration may be the optimal strategy as it offers larger heat transfer rates at larger values of Darcy number, Dam. However, Case 2 may be the optimal strategy as it provides moderate heat transfer rates involving savings on entropy production at larger values of Dam. On the other hand, at lower values of Dam (Dam ≤ 10−3), Case 1 or 2 exhibits almost similar heat transfer rates, while Case 1 is preferred for savings of entropy production.
Originality/value
The concave wall is found to be effective to enhance heat transfer rates to promote convection, while convex wall exhibits reduction of entropy production rate. Comparison between Case 1 and Case 2 heating strategies enlightens efficient heating strategies involving concave or convex walls for various values of Dam.
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Sobhan Pandit, Milan K. Mondal, Dipankar Sanyal, Nirmal K. Manna, Nirmalendu Biswas and Dipak Kumar Mandal
This study aims to undertake a comprehensive examination of heat transfer by convection in porous systems with top and bottom walls insulated and differently heated vertical walls…
Abstract
Purpose
This study aims to undertake a comprehensive examination of heat transfer by convection in porous systems with top and bottom walls insulated and differently heated vertical walls under a magnetic field. For a specific nanofluid, the study aims to bring out the effects of different segmental heating arrangements.
Design/methodology/approach
An existing in-house code based on the finite volume method has provided the numerical solution of the coupled nondimensional transport equations. Following a validation study, different explorations include the variations of Darcy–Rayleigh number (Ram = 10–104), Darcy number (Da = 10–5–10–1) segmented arrangements of heaters of identical total length, porosity index (ε = 0.1–1) and aspect ratio of the cavity (AR = 0.25–2) under Hartmann number (Ha = 10–70) and volume fraction of φ = 0.1% for the nanoparticles. In the analysis, there are major roles of the streamlines, isotherms and heatlines on the vertical mid-plane of the cavity and the profiles of the flow velocity and temperature on the central line of the section.
Findings
The finding of a monotonic rise in the heat transfer rate with an increase in Ram from 10 to 104 has prompted a further comparison of the rate at Ram equal to 104 with the total length of the heaters kept constant in all the cases. With respect to uniform heating of one entire wall, the study reveals a significant advantage of 246% rate enhancement from two equal heater segments placed centrally on opposite walls. This rate has emerged higher by 82% and 249%, respectively, with both the segments placed at the top and one at the bottom and one at the top. An increase in the number of centrally arranged heaters on each wall from one to five has yielded 286% rate enhancement. Changes in the ratio of the cavity height-to-length from 1.0 to 0.2 and 2 cause the rate to decrease by 50% and increase by 21%, respectively.
Research limitations/implications
Further research with additional parameters, geometries and configurations will consolidate the understanding. Experimental validation can complement the numerical simulations presented in this study.
Originality/value
This research contributes to the field by integrating segmented heating, magnetic fields and hybrid nanofluid in a porous flow domain, addressing existing research gaps. The findings provide valuable insights for enhancing thermal performance, and controlling heat transfer locally, and have implications for medical treatments, thermal management systems and related fields. The research opens up new possibilities for precise thermal management and offers directions for future investigations.
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Jeffrey W. Alstete and Heidi Flavian
This study aims to investigate basic/core principles and practical tools behind successful manuscript writing for education journals. Drawing on the insights of journal editors…
Abstract
Purpose
This study aims to investigate basic/core principles and practical tools behind successful manuscript writing for education journals. Drawing on the insights of journal editors and related literature, this paper seeks to clarify the craft of preparing quality manuscripts to meet the expectations of academic journals.
Design/methodology/approach
This paper uses an interpretivist framework by incorporating a qualitative analysis of the literature with the authors’ experiences to identify key principles and issues in academic publishing. These narratives provide an empirical basis for understanding the mechanics and essence of effective manuscript crafting. The study integrates theoretical knowledge with actionable strategies, focusing on identifying the objectives and processes of writing, determining common challenges and directing readers toward comprehensive resources for guidance in article writing.
Findings
This study reveals that manuscript rejections often transcend technical shortcomings. Issues that are central to nonacceptance include misalignment with a journal’s thematic focus, absence of a coherent and persuasive argument, methodological weaknesses and insufficient evidence underpinning the assertions. Successful publication depends not just on data presentation and adherence to submission norms but also on developing a narrative that enriches the prevailing scholarly discourse. Our findings advocate for manuscripts that strike an appropriate balance between lucidity and analytical rigor, avoid superfluous technical language and express a mix of assertiveness and scholarly modesty.
Originality/value
Although there is literature on academic writing, very few recent articles have been uncovered that probe the intricacies of crafting education manuscripts and point to resources.
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V.P. Priyesh and Lukose P.J. Jijo
This study investigates the impact of pre-IPO earnings management on investor demand in the Indian IPO market. It also examines whether earnings management by issuer firms affects…
Abstract
Purpose
This study investigates the impact of pre-IPO earnings management on investor demand in the Indian IPO market. It also examines whether earnings management by issuer firms affects IPO valuation, a topic that is underexplored in accounting research.
Design/methodology/approach
The study uses the data of 310 IPOs from India during the period 2000–2021. The association between pre-IPO earnings management with investor demand and valuation is tested using cross-sectional ordinary least squares regression models with heteroscedasticity-robust standard errors.
Findings
The study finds that the degree of pre-IPO earnings management impacts retail investor demand, measured as their over-subscription multiple. Pre-IPO earnings management is unrelated to institutional investor bidding. Further, this paper suggests no relation between pre-IPO earnings management and IPO valuation.
Research limitations/implications
Future studies could explore various other forms of earnings management and their impact on investor demand and valuation.
Practical implications
The findings of this study will help the investors and regulators to understand the practice of earnings management among IPO firms and how it is related to IPO demand and valuation.
Originality/value
This study contributes to the existing literature on IPO-earnings management and investor demand by documenting that issuer firms engage in earnings management to influence investor demand, particularly retail investor demand. Analysis of IPO valuation reveals that earnings management is mostly unrelated to IPO valuation, contrary to the general perception in the literature.
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Swechha Chada and Gopal Varadharajan
This paper aims to examine the relationship between earnings quality and corporate cash holdings in an emerging economy. Existing literature posits that earnings quality is a…
Abstract
Purpose
This paper aims to examine the relationship between earnings quality and corporate cash holdings in an emerging economy. Existing literature posits that earnings quality is a result of information asymmetry and firms with lower earnings quality increases cash holdings, to shield the firm from future uncertainties. In this paper, the authors propose a ‘private benefits hypothesis’, which suggests that lower earnings quality is an indicator of opportunism and expropriation of resources in the firm, through tunneling or excessive executive compensations. As a result, firms with lower earnings quality increase cash holdings in their control, to increase their private benefits and to avoid the scrutiny of the external stakeholders. The authors further examine the monitoring role played by institutional investors on cash holdings, with varying degrees of earnings quality.
Design/methodology/approach
This study uses an unbalanced panel data sourced from Prowessdx, from 2000 to 2019. The analysis employs 20,231 firm-year observations from 2,421 firms. Earnings quality is calculated following Dechow and Dichev (2002).
Findings
Empirical analysis confirms that the firms with higher earnings quality reduce cash. Further, institutional investors reduce the cash holdings in firms with higher earnings quality. Institutional investors effectively reduce the cash only in firms with at least 10% of equity shareholding. The results are robust to alternative measures of earnings quality and endogeneity concerns.
Originality/value
This study diverges from the information asymmetry hypothesis in the existing literature on earnings quality and cash holdings and highlights the underlying private benefits hypothesis, that will impact cash holdings. Next, the 10% institutional shareholding is important in the Indian context as it represents the minimum threshold at which block holders can request extraordinary general meetings (Section 100 of the Companies Act 2013) or the involvement of the National Company Law Tribunal (NCLT) (Section 213 of the Companies Act 2013). This study highlights that unlike in Anglo-Saxon economies, institutional investors or other minority shareholders are empowered by the Companies Act 2013 to play a vital role in corporate governance with a mere 10% equity.
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Deepa Mangala and Mamta Dhanda
This study aims to examine earnings management around initial public offerings (IPOs) in India. It also explores the influence of issue characteristics on earnings management…
Abstract
Purpose
This study aims to examine earnings management around initial public offerings (IPOs) in India. It also explores the influence of issue characteristics on earnings management around the IPOs.
Design/methodology/approach
A sample of 511 IPOs that came during April 2003-March 2019 is studied for calculating earnings management for pre-issue, issue and post-issue years. Using Cross-Sectional Modified Jones Model, the paper presents earnings management on the basis of three proxies i.e. discretionary accruals, discretionary current accruals and discretionary long-term accruals. The influence of issue characteristics on earnings management practised around the IPOs is also observed through correlation and multiple regression analysis.
Findings
The paper finds that earnings management is abnormally high during the issue year compared with pre-issue and post-issue years. It also unveils that profitability, premium, age, and size of the issuer significantly determine the level of pre-issue and issue year earnings management practised by Indian IPO issuers.
Research limitations/implications
The findings are useful to stakeholders (potential investors, analysts and regulators) to observe, assess and understand the quality of financial numbers that are based on fallacious disclosure of accounting figures. It provides insight into the possibilities of managed earnings around the issue that could influence investors’ decision-making. Further, the study reflects the efficacy of Indian regulatory norms for IPOs.
Originality/value
To the authors’ knowledge, it is the only Indian study that had used an extensive data set of about two decades to calculate earnings management during pre-issue, issue and post-issue years. The uniqueness of the study further lies in three proxies of earnings management representing short-term and long-term accruals. Moreover, it is the first study to observe the influence of IPO issue characteristics on earnings management.
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Nirmalendu Biswas, Dipak Kumar Mandal, Nirmal K. Manna, Rama S.R. Gorla and Ali J. Chamkha
This study aims to investigate the impact of different heater geometries (flat, rectangular, semi-elliptical and triangular) on hybrid nanofluidic (Cu–Al2O3–H2O) convection in…
Abstract
Purpose
This study aims to investigate the impact of different heater geometries (flat, rectangular, semi-elliptical and triangular) on hybrid nanofluidic (Cu–Al2O3–H2O) convection in novel umbrella-shaped porous thermal systems. The system is top-cooled, and the identical heater surfaces are provided centrally at the bottom to identify the most enhanced configuration.
Design/methodology/approach
The thermal-fluid flow analysis is performed using a finite volume-based indigenous code, solving the nonlinear coupled transport equations with the Darcy number (10–5 ≤ Da ≤ 10–1), modified Rayleigh number (10 ≤ Ram ≤ 104) and Hartmann number (0 ≤ Ha ≤ 70) as the dimensionless operating parameters. The semi-implicit method for pressure linked equations algorithm is used to solve the discretized transport equations over staggered nonuniform meshes.
Findings
The study demonstrates that altering the heater surface geometry improves heat transfer by up to 224% compared with a flat surface configuration. The triangular-shaped heating surface is the most effective in enhancing both heat transfer and flow strength. In general, flow strength and heat transfer increase with rising Ram and decrease with increasing Da and Ha. The study also proposes a mathematical correlation to predict thermal characteristics by integrating all geometric and flow control variables.
Research limitations/implications
The present concept can be extended to further explore thermal performance with different curvature effects, orientations, boundary conditions, etc., numerically or experimentally.
Practical implications
The present geometry configurations can be applied in various engineering applications such as heat exchangers, crystallization, micro-electronic devices, energy storage systems, mixing processes, food processing and different biomedical systems (blood flow control, cancer treatment, medical equipment, targeted drug delivery, etc.).
Originality/value
This investigation contributes by exploring the effect of various geometric shapes of the heated bottom on the hydromagnetic convection of Cu–Al2O3–H2O hybrid nanofluid flow in a complex umbrella-shaped porous thermal system involving curved surfaces and multiphysical conditions.
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After a decade of comparative and international education research, evaluation, reflection, and introspection, there still may not be a clear answer to the question: What…
Abstract
After a decade of comparative and international education research, evaluation, reflection, and introspection, there still may not be a clear answer to the question: What difference does an Annual Review of Comparative and International Education make? Bereday’s questions regarding the field from the 1960s largely remain unanswered, and what answers there are remain relatively unchanged from the initial review of the field in 2013. In this reflective piece, the editor of the Annual Review of Comparative and International Education provides a retrospective look at what the Annual Review of the field has produced as well as what has not been accomplished over the first 10 years of the Annual Review’s publication. Key points are that (1) comparative and international education continues to be an affiliation-oriented rather than independent, well defined field of study and practice; (2) annual reflection on the field is meaningful even when the field seems resistant to change; and (3) comparative and international education scholars and professionals alike tend to under emphasize reflective scholarship and practice and over emphasize critique or critical commentary; (4) there is promise for the field related to unity, debate, clarification, understanding, and encouragement; (5) the field is persistently under-professionalized; (6) the state of the field is largely unchanged since the 1960s; and (7) the organization and content of the Annual Review itself – much like the field itself – is subject to reflection and change.
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After a decade of comparative and international education research, evaluation, reflection, and introspection, there still may not be a clear answer to the question: What…
Abstract
After a decade of comparative and international education research, evaluation, reflection, and introspection, there still may not be a clear answer to the question: What difference does an annual review of comparative and international education make? Bereday’s questions regarding the field from the 1960s largely remain unanswered and what answers there are remain relatively unchanged from the initial review of the field in 2013. In this reflective piece, the editor of the Annual Review of Comparative and International Education provides a retrospective look at what the Annual Review of the field has produced as well as what has not been accomplished over the first 10 years of the Annual Review’s publication. Key points are that (1) comparative and international education continues to be an affiliation-oriented rather than independent, well defined field of study and practice; (2) annual reflection on the field is meaningful even when the field seems resistant to change; (3) comparative and international education scholars and professionals alike tend to under emphasize reflective scholarship and practice and over emphasize critique or critical commentary; (4) there is promise for the field related to unity, debate, clarification, understanding, and encouragement; (5) the field is persistently under-professionalized; (6) the state of the field is largely unchanged since the 1960s; and (7) the organization and content of the Annual Review itself – much like the field itself – is subject to reflection and change.
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