Dinuka B. Herath, Davide Secchi, Fabian Homberg and Gayanga B. Herath
Abstract
This paper is concerned with a numerical study on evolution of a deformed bubble and propagation of the fields around the bubble. The model uses a numerical procedure with the direct‐predictor method and the alternating dependent variables (ADV) skill developed by Li and Yan. The aim of this paper is to study the characteristics of interfacial transport for a deformed inviscid bubble rising in a quiescent hot or bi‐solution liquid. The effects of the bubble deformation on temperature and concentration fields are calculated and simulated. The results demonstrate that the current numerical procedure is effective for solving such unsteady deformation problems of bubble accompanied with heat and mass transfer.
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Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory…
Abstract
Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Committee, Reports and Technical Notes of the U.S. National Advisory Committee for Aeronautics, and publications of other similar research bodies as issued
Paul Dickson, W. Richards Adrion and Allen Hanson
We describe an automatic classroom capture system that detects and records significant (stable) points in lectures by sampling and analyzing a sequence of screen capture frames…
Abstract
We describe an automatic classroom capture system that detects and records significant (stable) points in lectures by sampling and analyzing a sequence of screen capture frames from a PC used for presentations, application demonstrations, etc. The system uses visual inspection techniques to scan the screen capture stream to identify points to store. Unlike systems that only detect and store slide presentation transitions, this system detects and stores significant frames in any style of computer‐based lecture using any program. The system is transparent to the lecturer and requires no software or training. It has been tested extensively on lectures with multiple applications and pen‐based annotations and has successfully identified “significant” frames (frames that represent stable events such as a new slide, bullet, figure, inked comment, drawing, code entry, application entry etc.). The system can analyze over 20000 frames and typically identifies and stores about 100 significant frames within minutes of the end of a lecture. A time stamp for each saved frame is recorded and will in the future be used to compile these frames into a jMANIC multimedia record of the class.
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Daizhong Su, Shuyan Ji, Nariman Amin and J.B. Hull
A Web‐based multi‐user system has been developed to remotely execute a large size software package via the Internet. The software implements a genetic algorithm to optimize the…
Abstract
A Web‐based multi‐user system has been developed to remotely execute a large size software package via the Internet. The software implements a genetic algorithm to optimize the design of spur and helical gears. To accomplish this, a combination of HTML, Java servlets, Java applets, Java Script and HTTP protocol has been employed.
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Within the last few years, a couple of presentation systems have been developed for assisting higher education. This article aims to provides an overview of available systems and…
Abstract
Purpose
Within the last few years, a couple of presentation systems have been developed for assisting higher education. This article aims to provides an overview of available systems and highlight differences regarding their individual intention and technical approaches.
Design/methodology/approach
The article consists of a comprehensive system and literature review and provides a taxonomy. Famous systems are categorized and discussed including their individual approaches.
Findings
The advantages and disadvantages of different approaches are presented. The discussion provides readers also with information relevant for rating systems according their personal needs.
Research limitations/implications
The categorization for presentation systems can be extended and applied for the categorization of audience response systems.
Practical implications
A source of information that assists users while they choose an appropriate existing presentation system and developers while they design new ones.
Originality/value
This article presents a workflow‐oriented taxonomy for educational presentation systems which is used to analyze several systems. In addition, the different underlying conceptual and technical approaches of different systems are discussed in this work. The provided information is useful for users and developers of such systems.
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N. Gökhan Torlak and Cemil Kuzey
The purpose of this paper is to get an insight into which form leadership either transactional leadership (TAL) or transformational leadership (TFL) is most effective in the…
Abstract
Purpose
The purpose of this paper is to get an insight into which form leadership either transactional leadership (TAL) or transformational leadership (TFL) is most effective in the educational sector of Pakistan and to determine the impact of each on the employee job satisfaction (EJS) and employee job performance (EJP). Given research site observation, appropriate leadership was essential to high-quality education in Pakistan.
Design/methodology/approach
Data are collected through a survey based on e-mail/interview from 189 employees working at private education institutes in Pakistan. Analysis methodology includes frequency analysis, descriptive statistics, paired samples t-test, Pearson correlation analysis and regression analysis.
Findings
Only management by exception (MBE) and idealized influence (II), inspirational motivation (IM), intellectual stimulation (IS) and individualized consideration (IC) had significant positive association with both EJS and EJP. MBE had a positive significant effect on both EJS and EJP, while contingent rewards had no significant relation with EJS and weak positive significant association with EJP. Furthermore, II, IM, IS and IC had a positive significant impact on EJS and EJP.
Research limitations/implications
Respondents were from major private educational institutes in Islamabad and Lahore. The leadership style – TAL–TFL – was the sole variable to judge EJS/EJP. Multifaceted populations’ perspectives might enhance the attributes of TAL/TFL. This study might influence the authorities to adopt the right leadership style securing high-quality education system for both private and public education institutes in Pakistan.
Originality/value
The study filled the gap in the educational sector of Pakistan, where research works into leadership styles-satisfaction-performance links were few and far between.
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The paper aims at studying numerically a vapour bubble growth in uniformly superheated liquid.
Abstract
Purpose
The paper aims at studying numerically a vapour bubble growth in uniformly superheated liquid.
Design/methodology/approach
Time dependent mathematical and numerical models are developed. Based on the Stefan boundary condition, the rate of heat transfer at the vapour‐liquid interface and the rate of bubble growth are calculated.
Findings
It is found that, at the initial stage of bubble growth, both the growth rate and the mean Nusselt number at bubble interface have the maximum values, then they decrease with time; the rate of bubble growth also has a significant effect on bubble deformation; the growth tends to keep the bubble at its initial shape. In addition, the growth and deformation of a vapour bubble have much influence on temperature propagation in the vicinity of the bubble‐liquid interface; the temperature wake at the rear of the bubble occurs at high Reynolds number but does not appear at low Reynolds number.
Originality/value
The paper is based on the authors' original work, focusing on the behaviour of a vapour bubble in uniformly superheated liquid–an issue of importance in the field of boiling and two phase flow.
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Since their creation through the Industrial Training Act 1964 to hear appeals against levies, the jurisdiction of industrial tribunals has grown considerably. One aspect of this…
Abstract
Since their creation through the Industrial Training Act 1964 to hear appeals against levies, the jurisdiction of industrial tribunals has grown considerably. One aspect of this jurisdiction, unfair dismissal, is examined here. Basic principles related to the law of unfair dismissal are examined. The practice and procedure of an industrial tribunal solely in connection with unfair dismissal cases are examined in greater detail. A case study is used to illustrate the important aspects of procedure. Appendices give relevant forms and extracts from the appropriate Code of Practice.
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Jafar Masri, Laurent Dala and Benoit Huard
This paper aims to investigate the different analytical methods used to predict the performance of seaplanes to define the weaknesses in each method and be able to extend the…
Abstract
Purpose
This paper aims to investigate the different analytical methods used to predict the performance of seaplanes to define the weaknesses in each method and be able to extend the analytical approach to include the nonlinear terms (unsteadiness).
Design/methodology/approach
First, the elemental hydrodynamic characteristics of seaplanes are discussed. Second, five different analytical methods are reviewed. The advantages and disadvantages of each method are stated. After that, the heave and pitch equations of seaplane motion are illustrated. The procedure of obtaining the solution of the heave and pitch equations of seaplane motion is explained. Finally, the results obtained from the most common methods are compared.
Findings
The results show that the methods are based on different assumptions and considerations. As a result, no method is optimal for all types of seaplanes. Moreover, some of the analytical methods do not study the stability of the seaplane, which is a major issue in the design of seaplanes. In addition, all methods consider the motion as steady and linear. The objective is to extend the work to include the nonlinear effects.
Originality/value
This paper presents some of the analytical methods used in describing the performance of seaplanes and explains how can they be applied. Moreover, it summarises the advantages and disadvantages of each method.