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Article
Publication date: 25 July 2019

Sajjad Haider, Imran Syed Muhammad, Yun-Zhang Li and Adnan Saeed Butt

This paper aims to incorporate a numerical investigation of unsteady flow of nano-fluid near the boundary wall and heat transmission over a flat sheet in porous media…

Abstract

Purpose

This paper aims to incorporate a numerical investigation of unsteady flow of nano-fluid near the boundary wall and heat transmission over a flat sheet in porous media under the assumption that sheet is continuously stretching. A comprehensive study is accomplished to probe the impacts of different physical parameters on heat transmission and fluid flow.

Design/methodology/approach

The problem is designed mathematically by using Navier–Stokes equations and corresponding equations are transmuted into non-dimensional form, which are reduced to local non-similarity equations. Implicit finite difference scheme is used to attain a non-similar solution for values of similarity variable ranging in [0,1]

Findings

The reduced Nusselt number is a decreasing function of each dimensionless number, while the reduced Sherwood number is an increasing function of each considered value of parameters Pr, Sc, Nb and Nt.

Originality value

Motivated by the industrial, technological and scientific importance, the objective of this study is to discuss the unsteady flow generated by linear stretching of the surface in Nano-fluid in a porous medium. However, the investigation of unsteady boundary layer flow and heat transfer of a Nano-fluid past a stretching surface immersed in a porous medium has not been discussed yet. Furthermore, finite difference scheme is used to solve the problem, and authenticate results are achieved which are in good agreement with published work.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 30 no. 4
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 9 December 2019

Noor Arshad, Abu Bakar, Saira Hanif Soroya, Iqra Safder, Sajjad Haider, Saeed-Ul Hassan, Naif Radi Aljohani, Salem Alelyani and Raheel Nawaz

The purpose of this paper is to present a novel approach for mining scientific trends using topics from Call for Papers (CFP). The work contributes a valuable input for…

Abstract

Purpose

The purpose of this paper is to present a novel approach for mining scientific trends using topics from Call for Papers (CFP). The work contributes a valuable input for researchers, academics, funding institutes and research administration departments by sharing the trends to set directions of research path.

Design/methodology/approach

The authors procure an innovative CFP data set to analyse scientific evolution and prestige of conferences that set scientific trends using scientific publications indexed in DBLP. Using the Field of Research code 804 from Australian Research Council, the authors identify 146 conferences (from 2006 to 2015) into different thematic areas by matching the terms extracted from publication titles with the Association for Computing Machinery Computing Classification System. Furthermore, the authors enrich the vocabulary of terms from the WordNet dictionary and Growbag data set. To measure the significance of terms, the authors adopt the following weighting schemas: probabilistic, gram, relative, accumulative and hierarchal.

Findings

The results indicate the rise of “big data analytics” from CFP topics in the last few years. Whereas the topics related to “privacy and security” show an exponential increase, the topics related to “semantic web” show a downfall in recent years. While analysing publication output in DBLP that matches CFP indexed in ERA Core A* to C rank conference, the authors identified that A* and A tier conferences not merely set publication trends, since B or C tier conferences target similar CFP.

Originality/value

Overall, the analyses presented in this research are prolific for the scientific community and research administrators to study research trends and better data management of digital libraries pertaining to the scientific literature.

Details

Library Hi Tech, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0737-8831

Keywords

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Article
Publication date: 19 August 2019

Sajjad Haider, Adnan Saeed Butt, Imran Syed Muhammad, Asif Ali, Yun-Zhang Li, Syed Muhammad Ali Naqvi and Muhammad Adnan Qaiser

The purpose of this study is to theoretically probe the shape impacts of nano-particle on boundary layer flow of nano-fluid toward a stretching cylinder with…

Abstract

Purpose

The purpose of this study is to theoretically probe the shape impacts of nano-particle on boundary layer flow of nano-fluid toward a stretching cylinder with heat-transmission effects. The base fluid used for this study is pure water, and aluminum oxide nano-particles are suspended in it. Four different shapes of nano-particle, namely, cylindrical, brick, platelets and blades, are considered to carry out the study.

Design/methodology/approach

The problem is modelled mathematically and the nonlinear system of equations is attained by using appropriate transmutations. The solution of transmuted equations is achieved by utilizing a shooting technique with Fourth-Fifth order Runge–Kutta Fehlberg scheme. Numerically attained results are elucidated through graphs and tables which are further compared under limiting cases with existing literature to check the validity of the results.

Findings

It is observed that fluid velocity and temperature of cylindrical shaped water nano-fluids are more than the nano-fluid having brick-shaped nano-particles. Moreover, it is seen that the nano-fluids suspended with platelets-shaped nano-particles have higher velocity and temperature than the nano-fluids containing blade-shaped nano-particles. The curvature parameter and nano-particles volume fraction have increasing effects on flow velocity and temperature of nano-fluids containing all types of nano-particle shapes.

Originality/value

Numerous authors have examined the impacts of nano-particle shapes on characteristics of heat transfer and fluid flow. However, to the best of the authors’ knowledge, the shape impacts of nano-particles on boundary layer flow of nano-fluid toward a stretching cylinder with heat-transmission effects have not been discussed. So, to fulfill this gap, the present paper explicates the impacts of various nano-particle shapes on Al2O3–water-based nano-fluid flow past a stretching cylinder with heat-transfer effects.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 30 no. 5
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 31 August 2019

Sajjad Haider, Nouman Ijaz, A. Zeeshan and Yun-Zhang Li

Numerous researchers have probed the peristaltic flows because of their immense usage in industrial engineering, biomedical engineering and biological sciences. However…

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Abstract

Purpose

Numerous researchers have probed the peristaltic flows because of their immense usage in industrial engineering, biomedical engineering and biological sciences. However, the investigation of peristaltic flow in two-phase fluid of a rotating frame in the presence of a magnetic field has not been yet discussed. Therefore, to fulfill this gap in the existing literature, this paper will explicate the peristaltic flow of two-phase fluid across a rotating channel with the effect of wall properties in the presence of a magnetic field. The purpose of this study is to investigate the two-phase velocity distribution and rotation parameter when magneto-hydrodynamics is applied.

Design/methodology/approach

The constituent equations are solved under the condition of low Reynolds number and long wavelength. The exact method is used to attain the subsequent equations and a comprehensive graphical study for fluid phase, particulate phase velocity and flow rates are furnished. The impacts of pertinent parameters, magnetic field and rotation are discussed in detail.

Findings

It is witnessed that the velocity profile of particulate phase gets higher values for the same parameters as compared to the fluid phase velocity. Moreover, the axial velocity increases with different values of particle volume fraction, but in case of magnetic field and rotation parameter, it shows the opposite behavior.

Practical implications

The outcomes of study have viable industrial implementations in systems comprising solid-liquid based flows of fluids involving peristaltic movement.

Originality/value

The investigation of peristaltic flow in two-phase fluid of a rotating frame in the presence of a magnetic field has not been yet discussed. Therefore, to fulfill this gap, the present study will explicate the peristaltic flow of two-phase fluid across a rotating channel with the effect of wall properties in the presence of magnetic field.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 30 no. 5
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 25 February 2014

Anas Obeidat, Teis Schnipper, Kristian M. Ingvorsen, Sajjad Haider, Knud Erik Meyer, Stefan Mayer and Jens H. Walther

– The purpose of this paper is to study the effect of piston position on the in-cylinder swirling flow in a simplified model of a large two-stroke marine diesel engine.

Abstract

Purpose

The purpose of this paper is to study the effect of piston position on the in-cylinder swirling flow in a simplified model of a large two-stroke marine diesel engine.

Design/methodology/approach

Large eddy simulations with four different models for the turbulent flow are used: a one-equation model, a dynamic one-equation model, a localized dynamic one-equation model and a mixed-scale model. Simulations are carried out for two different geometries corresponding to 100 and 50 percent open scavenge ports.

Findings

It is found that the mean tangential profile inside the cylinder changes qualitatively with port closure from a Lamb-Oseen vortex profile to a solid body rotation, while the axial velocity changes from a wake-like profile to a jet-like profile. The numerical results are compared with particle image velocimetry measurements, and in general, the authors find a good agreement.

Research limitations/implications

Considering the complexity of the real engine, the authors designed the engine model using the simplest configuration possible. The setup contains no moving parts, the combustion is neglected and the exhaust valve is discarded.

Originality/value

Studying the flow in a simplified engine model, the setup allows studies of fundamental aspects of swirling flow in a uniform scavenged engine. Comparing the four turbulence models, the local dynamic one-equation model is found to give the best agreement with the experimental results.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 24 no. 2
Type: Research Article
ISSN: 0961-5539

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Article
Publication date: 7 April 2014

Sajjad Haider

The purpose of this paper is to analyze the processes of identification, emergence and filling of organizational knowledge gaps over an extended period of time, using the

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1088

Abstract

Purpose

The purpose of this paper is to analyze the processes of identification, emergence and filling of organizational knowledge gaps over an extended period of time, using the strategy in action perspective. Specifically, it aims to explore the nature and types of knowledge gaps, to capture their changes and to shed some light on the processes of filling knowledge gaps.

Design/methodology/approach

The study is based on two case studies and adopts a processual approach. It analyses 40 years of data collected using secondary sources and semi-structured interviews over a period of two years and identifies critical organizational events both in retrospect and real time.

Findings

The findings show that the two case study companies have identified a number of knowledge gaps over the 40 years period. Changes in the nature and type of knowledge gaps are identified and discussed in detail leading to a new taxonomy of organisational knowledge gaps. The findings report that knowledge gaps emerge due to changes in both exogenous and endogenous conditions over time. The filling of those gaps depends on a number of factors. Among these, the ability to make a distinction between “strategic” and “imposed” knowledge gaps and the ability to build absorptive capacity within a stipulated time frame have a predominant role.

Research limitations/implications

The respondents were asked to look back into the history of their company using their memory of events to provide explanations surrounding critical organizational events. Since some of the respondents had not witnessed all of the events in question, their responses were at times based on hearsay. However, every effort was made to check the authenticity of the respondents ' explanations, such as using a range of sources and discussing the events with respondents at different hierarchical levels of the company.

Practical implications

This study provides examples of knowledge in practice and puts forward a new taxonomy of knowledge gaps which can help managers to deal with imposed and strategic knowledge requirements. Specifically, this study equips managers with tools on how to devise their knowledge strategy, how to identify their knowledge requirements and what are different sources (internal and external) which they can explore to fill those knowledge gaps.

Originality/value

The paper builds on the strategy in practice perspective, which stresses the need for further studies to link theoretical frameworks with practical solutions. In this respect, this paper attempts to make sense of organizational knowledge theory by applying it in real life business situations and by unearthing the concept and usage of knowledge gaps. The use of a retrospective processual approach to study changes in organizational knowledge requirements over time is another interesting aspect of this research. Finally, the paper provides a new taxonomy of organizational knowledge gaps.

Details

Journal of Knowledge Management, vol. 18 no. 2
Type: Research Article
ISSN: 1367-3270

Keywords

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Article
Publication date: 15 August 2016

Sajjad Haider and Francesca Mariotti

The purpose of this paper is to examine strategic decisions surrounding critical events to show how the decision-making processes evolve and how the dominant logic changes…

Abstract

Purpose

The purpose of this paper is to examine strategic decisions surrounding critical events to show how the decision-making processes evolve and how the dominant logic changes vis-à-vis those decisions. Further, this study explores the processes of managerial decision making focusing on spatial and temporal cognition dimensions.

Design/methodology/approach

The methodology adopted in this study is a case study using the retrospective processual analysis approach. Data were collected using both primary and secondary sources. In all, 40 years of secondary data on key critical events and decision making were collected using a range of secondary sources. Those events were further examined using 49 in-depth semi structured interviews.

Findings

The findings of this study explain the relationship between operant conditions, strategic actions and outcomes of strategic decisions by highlighting the significance of knowledge strategy, strategic agility and intentionality in shaping and reshaping managers’ dominant logic. Further, the authors show that the dominant coalition, among other factors, plays an important role in building decision-making capacity and in the formation and transformation of an existing dominant logic.

Research limitations/implications

The study identified a number of limitations. First, the issue of generalization as the data were collected from only two case study companies. Second, in some cases respondents were asked to respond to research questions using “memory of the events” which took place a long time ago, hence the issue of credibility. Further, sometimes respondents reported information collected through hearsay. To overcome the limitations of this research, the authors made all efforts to ensure that the data collected were reliable and credible such as by using diverse data sources, confirmation of events at multiple level and personal observations.

Practical implications

The study identifies and explains a number of factors which influence decision making. The authors also present the revised dominant logic model which can act as a tool in managerial decision making.

Originality/value

The paper shows how managerial decision making changes knowledge strategy, which in turn leads to changes in existing dominant logic or the creation of a new dominant logic, hence looking at the issues of decision making using an evolutionary perspective. Second, the paper empirically tests and explains the relationship between intentionality, actions and organizational outcomes using spatial and temporal learning. Finally, the use of the longitudinal retrospective processual analysis and events analysis, is a novel way of understanding a particular phenomenon.

Details

Management Decision, vol. 54 no. 7
Type: Research Article
ISSN: 0025-1747

Keywords

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Article
Publication date: 23 August 2021

Shokouh Razaghi and Sajjad Shokouhyar

This study aims to show that management with big data analytics capability can achieve more advantages of the global sourcing process. Furthermore, this study using its…

Abstract

Purpose

This study aims to show that management with big data analytics capability can achieve more advantages of the global sourcing process. Furthermore, this study using its conceptual attitude model aims to show that big data analytics management capability leads to an increase in firm performance by the mediating role of integration.

Design/methodology/approach

Using an online questionnaire, 158 managers from 13 Iranian companies taking advantage of the global sourcing process were surveyed. The validity of the hypotheses was evaluated using partial least squares based on structural equation modeling (PLS method).

Findings

The results of the study showed that big data analytics management capability has a positive impact on global sourcing and firm performance directly, and by the mediating role of integration.

Originality/value

Previous studies have carefully addressed the role of big data and big data analytics in firms. However, this is among a few studies addressing the role of big data analytics capability, especially management capability, in improving firms’ performance. The results of this study shed light on the fact that how global sourcing takes the best advantage of big data analytics management capability for better accomplishment of organizations’ duties. The results of this study also disclose how big data analytics management capability helps organizations with their performance and bring benefits to their units.

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Article
Publication date: 6 January 2020

Sajjad Shokouhyar, Mohammad Reza Seddigh and Farhad Panahifar

The purpose of this paper is to develop a theoretical model to explain the impact of big data analytics capabilities (BDAC) on company’s supply chain sustainability…

Abstract

Purpose

The purpose of this paper is to develop a theoretical model to explain the impact of big data analytics capabilities (BDAC) on company’s supply chain sustainability (CSCS). The secondary objective of the study is to assess the relationship between different dimensions of supply chain sustainability and companies’ BDAC.

Design/methodology/approach

This research was carried out by conducting a survey among 234 pharmaceutical companies in Iran (a case study of Iran), using a standard questionnaire of BDAC and United Nations (UN) online self-assessment on supply chain sustainability. However, the respond of managers of 188 companies were usable in this research. Smart PLS3 was used to employ partial least squares method to examine the validity and reliability of the measurement and structural model.

Findings

The results of this study demonstrate that BDAC have a strong impact on both pharmaceutical supply chain sustainability, and the dimensions including vision, engage and internal. It is found that the relationships between BDAC and the other dimensions of supply chain sustainability including expect, scope and goals are not significant but positive.

Research limitations/implications

Research on the relationship between BDAC and CSCS, especially in the pharmaceutical supply chain, is scanty, and this gap is highlighted in developing countries and the pharmaceutical supply chain that plays a prominent role in public health. This paper discusses several important barriers to forming a sustainable supply chain and strong BDA capabilities.

Practical implications

This paper could be a guide to managers and consultants who are involved in big data analytics and sustainable development. Since UN urges companies do the online self-assessment, the results of this paper would be attractive and useful for UN global compact specialists.

Originality/value

No study has directly measured the relation between BDAC and CSCS and different dimensions of CSCS, using a comprehensive survey throughout all pharmaceutical companies in Iran. Moreover, this research assesses the different dimensions of BDA capabilities and supply chain sustainability. This paper represents the facts about situation of sustainability of pharmaceutical supply chain and BDAC in these companies, and discloses several related issues that are serious barriers to forming a sustainable supply chain and strong BDAC. In addition, this paper provided academic support for UN questionnaire about CSCS and used it in the survey.

Details

World Journal of Science, Technology and Sustainable Development, vol. 17 no. 1
Type: Research Article
ISSN: 2042-5945

Keywords

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Article
Publication date: 31 May 2013

Abubakr Suliman and Hanan Al Obaidli

This research aims at investigating, for the first time in the Arab world, the influence of leadership behaviors on organizational citizenship behaviors (OCB) in the…

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2181

Abstract

Purpose

This research aims at investigating, for the first time in the Arab world, the influence of leadership behaviors on organizational citizenship behaviors (OCB) in the Islamic banking sector. Also, it explores the role of OCB in affecting work outcomes.

Design/methodology/approach

The study consists of two core concepts: leadership behaviors and OCB. The sample population for the study was drawn from 150 employees working for several Islamic banks in the United Arab Emirates (UAE). A self‐administered questionnaire was developed by combining two instruments.

Findings

The findings revealed that transformational and transactional leadership styles tend to play a significant role in employees' OCB. Nonetheless, passive/avoidant leadership style plays no role of statically evidence in the relationship.

Practical implications

The theoretical and managerial implications of the findings are discussed in the paper, together with some recommendations for managing leadership and OCB in the service sector.

Originality/value

The paper examines for the first time the links between leadership and OCB in the Islamic banking sector of the UAE and the Arabic context.

Details

Asia-Pacific Journal of Business Administration, vol. 5 no. 2
Type: Research Article
ISSN: 1757-4323

Keywords

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