Behavior of thermo-mechanically treated rebar exposed to elevated temperatures

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bishwajeet Choubey ◽  
Virendra Kumar ◽  
Sekhar Chandra Dutta ◽  
Saurav Kumar Saikia
Keyword(s):  
Design Methodology ◽  
Elevated Temperatures ◽  
Fracture Strain ◽  
Constitutive Relations ◽  
List Type ◽  
Content Type ◽  
Independent Variables ◽  
Empirical Relations ◽  
Work Done ◽  
Duration Of Heating

PurposeThe purpose of the paper is to mathematically model and predict the characteristics of thermo-mechanically treated (TMT) rebar when subjected to elevated temperatures.Design/methodology/approachData were collected from a few selected studies for developing the constitutive relations. Using the exposed temperature and the duration of heating as independent variables, the empirical relations were developed for determining the changes in mechanical properties of TMT rebars at elevated temperatures.FindingsRecrystallization of TMT rebar crystals took place around 500 °C, which led to a decrease in the dislocation density along with the increase of large-sized grains, resulting in the degradation of strength. Up to a temperature range of 500 °C, the normalized fracture strength was higher, while the normalized fracture strain is not so high. This indicated a failure of brittle nature.Originality/valueThis is an original work done by others as a study to theoretically predict the mechanical behavior of TMT rebars when exposed to elevated temperature.HighlightsThe TMT bars showed brittleness characteristics up to 500 °C and showed ductility characteristics after that on account of its recrystallization and extensive tempering of the outer martensitic rim around that temperature.The comparison between the super ductile (SD) TMT and the regular TMT exhibit shows that the SD-TMT bars were about 1.5 times more ductile than the normal ones.

Digital forensics and evolving cyber law: case of BIMSTEC countries

2019 ◽  
Vol 22 (4) ◽  
pp. 744-752
Author(s):  
Sisira Dharmasri Jayasekara ◽  
Iroshini Abeysekara
Keyword(s):  
Information Technology ◽  
Design Methodology ◽  
Digital Forensics ◽  
Content Type ◽  
Global Context ◽  
Study Approach ◽  
Legal Frameworks ◽  
Work Done

Purpose The purpose of this paper is to discuss the role of digital forensics in an evolving environment of cyber laws giving attention to Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation (BIMSTEC) countries, comprising Bangladesh, India, Myanmar, Sri Lanka, Thailand, Nepal and Bhutan, in a dynamic global context. Design/methodology/approach This study uses a case study approach to discuss the digital forensics and cyber laws of BIMSTEC countries. The objective of the study was expected to be achieved by referring to decided cases in different jurisdictions. Cyber laws of BIMSTEC countries were studied for the purpose of this study. Findings The analysis revealed that BIMSTEC countries are required to amend legislation to support the growth of information technology. Most of the legislation are 10-15 years old and have not been amended to resolve issues on cyber jurisdictions. Research limitations/implications This study was limited to the members of the BIMSTEC. Originality/value This paper is an original work done by the authors who have discussed the issues of conducting investigations with respect to digital crimes in a rapidly changing environment of information technology and deficient legal frameworks.

Online viewers’ choices over advertisement number and duration

2020 ◽  
Vol 14 (2) ◽  
pp. 215-238
Author(s):  
Stephen Nettelhorst ◽  
Laura Brannon ◽  
Angela Rose ◽  
Whitney Whitaker
Keyword(s):  
Exposure Time ◽  
Design Methodology ◽  
Persuasive Messages ◽  
Content Type ◽  
Independent Variables ◽  
Research Designs ◽  
Total Exposure Time ◽  
Online Simulations ◽  
Independent Variable ◽  
Two Independent Variables

Purpose The purpose of this study is to investigate online viewers’ preferences concerning the number and duration of video advertisements to watch during commercial breaks. The goal of the investigations was to assess whether online viewers preferred watching a fewer number of advertisements with longer durations or a greater number of advertisements with shorter durations. Design/methodology/approach Two studies used experimental research designs to assess viewers’ preferences regarding advertisements. These designs used two independent variables and one dependent variable. The first independent variable manipulated the type of choice options given to online viewers (e.g. one 60 s or two 30 s advertisements). The second independent variable manipulated when the choice was given to online viewers (i.e. at the beginning of the viewing experience or in the middle of the experience). The dependent variable measured viewers’ choices concerning their preferred advertisement option. Findings The results across both studies found that participants made choices that minimized total advertisement exposure time when possible. When minimizing total exposure time was not possible, participants made choices that minimized the number of exposures instead. Originality/value These investigations extend the literature on advertisement choice by examining online viewers’ preferences about the format of their advertising experience rather than the content of the persuasive messages themselves. In addition, these investigations provide value by investigating viewers’ responses to stimuli within realistic online simulations rather than abstract hypotheticals.

Lubricant compatibility of FKM seals in synthetic oils

2019 ◽  
Vol 72 (5) ◽  
pp. 557-565
Author(s):  
Dilek Bulut ◽  
Tatjana Krups ◽  
Gerhard Poll ◽  
Ulrich Giese
Keyword(s):  
Polyethylene Glycol ◽  
Design Methodology ◽  
Elevated Temperatures ◽  
Failure Mechanisms ◽  
Standard Test ◽  
New Method ◽  
Static Tests ◽  
Content Type ◽  
Lip Seals ◽  
First Results

Purpose Elastomer seals are used in many applications. They are exposed to lubricants and additives at elevated temperatures, as well as mechanical stresses. They can only provide good sealing function when they have resistance to those factors. There are many elastomer-lubricant compatibility tests based on DIN ISO 1817 in industry. However, they are insufficient and costly. Correlations between the tests and the applications are inadequate. The purpose of this study is investigating lubricant compatibility of fluoroelastomers (FKM) seals in polyethylene-glycol (PG)- and polyalphaolefin (PAO)- based synthetic oils and developing a methodology to predict seal service life. Design/methodology/approach A new compatibility test which is more sufficient in terms of time and cost was developed and compared with a standard test, currently used in industry. Compatibility of FKM radial lip seals with PG- and PAO-based synthetic oils with different additives was investigated chemically and dynamically. Failure mechanisms were examined. Findings The new method and the Freudenberg Flender Test FB 73 11 008 showed similar results concerning damages and similar tendencies regarding wear. The additive imidazole derivative was the most critical. Static tests give indications of possible chemically active additives, but alone they are insufficient to simulate the dynamic applications. Originality/value The paper describes a new method to investigate elastomer-lubricant compatibility and gives first results with a variety of lubricants.

Copa America: a resource-based theory of football talent

2019 ◽  
Vol 25 (3/4) ◽  
pp. 176-191
Author(s):  
Peter Omondi-Ochieng
Keyword(s):  
Logistic Regression ◽  
Design Methodology ◽  
Binary Logistic Regression ◽  
Content Type ◽  
Independent Variables ◽  
Football Team ◽  
Practical Implications ◽  
Resource Based Theory

Purpose Guided by the resource-based theory, the purpose of this study was to predict the role of football talent in the Federation Internationale de Football Association (FIFA) rankings of the men’s national football teams in the Copa America zone. Design/methodology/approach The study used archival data of Copa American national football teams. The dependent variable was FIFA rankings, and the independent variables were football talent (measured by the stocks of amateur footballers, professional footballers and football officials). Statistical analysis was performed using Kendall tau statistic and binary logistic regression. Findings The binary logistic regression results indicated that FIFA rankings were statistically and significantly associated with the stock of football officials and professional footballers – but not amateur footballers. The predictive model explained 80 per cent of the variance. Research limitations/implications The study focused exclusively on the stock of football talent in each nation, and not alternative determinants of national football team competitiveness as economic power and quality of professional football leagues, among others. Practical implications The stocks of professional footballers and football officials are valuable sources of competitive advantage (CA) in national football team rankings. Originality/value The study highlighted the uniqueness and distinctiveness of a nation possessing large stocks of professional footballers which can boost the CA and rankings of Copa American national football teams.

A mediator of consumers' willingness to pay for halal logistics

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Dg Ku Zunaidah Ag Majid ◽  
Suhaila Abdul Hanan ◽  
Hazlinda Hassan
Keyword(s):  
Willingness To Pay ◽  
Empirical Research ◽  
Significant Influence ◽  
Design Methodology ◽  
Direct Relationship ◽  
Content Type ◽  
Independent Variables ◽  
Survey Questions ◽  
Increasing Demand

PurposeThe halal industry has been growing in recent years, seeing an increasing demand for halal products from both Muslim and non-Muslim consumers and acknowledging that halal is a universal concept accepted by both Muslim and non-Muslim societies. Service-related providers, such as logistics, could influence the demand for halal products by consumers. This paper aims to investigate the factors that influence consumers' willingness to pay (WTP) for halal logistics among young non-Muslim adults.Design/methodology/approachA set of survey questions were distributed to young non-Muslim adults and 280 questionnaires were analysed.FindingsThe results indicate that three independent variables had a direct relationship and significant influence on the WTP for halal logistics among non-Muslim consumers. These variables are concern on halal, knowledge about halal and perception of halal logistics. Meanwhile, the awareness of halal logistics significantly influenced the consumers' WTP for halal logistics, provided that it was mediated by the perception of halal logistics.Originality/valueGiven the gap in research on halal logistics and WTP, this paper presents a consolidated examination of this subject, particularly the WTP of young non-Muslim adults. Furthermore, by including the perception of halal logistics as a mediator, this study leverages the halal logistics knowledge to a new level, thus deepening the understanding of this topic and contributing additional knowledge. This study also presents some opportunities for future empirical research.

E-commerce trading activity and the SME sector: an FSB perspective

2013 ◽  
Vol 20 (4) ◽  
pp. 866-888 ◽  
Author(s):  
David Pickernell ◽  
Paul Jones ◽  
Gary Packham ◽  
Brychan Thomas ◽  
Gareth White ◽  
...  
Keyword(s):  
Public Sector ◽  
Small Businesses ◽  
Design Methodology ◽  
Public Procurement ◽  
Content Type ◽  
Independent Variables ◽  
High Knowledge ◽  
Ict Development ◽  
The University ◽  
Trading Behaviour

Purpose – This study aims to examine e-commerce within UK small and medium sized enterprises (SMEs). More specifically, it seeks to explore associations between e-commerce and internal and external antecedents including trading behaviour, owner/manager characteristics, innovation, public sector involvement, business advice and finance sources. Design/methodology/approach – An 8,500+ sample derived from the 2008 UK Federation of Small Businesses survey was utilised. An OLS regression equation was generated where the percentage of sales made using e-commerce constituted the dependent variable. Independent variables were constructed for several sets of factors including innovation, business advice and sources of finance, as well as a range of owner and SME typology variables. Findings – The results suggest that e-commerce is more strongly apparent in SMEs started from scratch and where they were involved in basic or high knowledge services or the tourist trade. SMEs undertaking e-commerce were also associated with innovation in the form of copyright, as well as public procurement with local authorities and the university sector. Specific business advice in the form of capacity, family and suppliers was also associated with e-commerce trading. Research limitations/implications – These results have implications for SMEs and public sector stakeholders. SMEs must recognise the importance of several potential antecedents such as intellectual property rights, specific business advice and finance to encourage e-commerce. Moreover, it was apparent that certain SME characteristics, namely locality and trading behaviour, were associated with effective e-commerce. Originality/value – This study will be of value to academia, SMEs and key public sector stakeholders in the formulation of policy for ICT development.

Stability check of tapered steel beams in fire

2019 ◽  
Vol 10 (4) ◽  
pp. 373-398 ◽  
Author(s):  
Carlos Couto ◽  
Élio Maia ◽  
Paulo Vila Real ◽  
Nuno Lopes
Keyword(s):  
Design Methodology ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Numerical Models ◽  
Design Methods ◽  
Steel Beams ◽  
Content Type ◽  
Design Methodologies ◽  
Accurate Design ◽  
Improved Design

Purpose The purpose of this paper is to assess whether the adaptation to fire of current proposals/design methodologies at normal temperature is capable of producing accurate predictions of resistance for the out-of-plane stability of tapered beams. Design/methodology/approach The adaptation of these methodologies to fire has been done by accounting for the reduction in steel material properties with the temperature. Results were then compared to FEM calculations by performing GMNIA analyses to determine the ultimate strength of the numerical models and to ascertain the validity and accuracy of the adapted methodologies. Findings Although all methodologies produce safe results at normal temperatures, only the general method is recommended for the safety verification at elevated temperatures, although the data points were overly conservative. This investigation demonstrates the need of proper and accurate design methods for tapered beams at elevated temperatures, which should be the subject of future developments. Research limitations/implications The research in this paper is limited to the adaptation of existing room temperature design methods to fire. Therefore, possible assumptions made during the conception of the initial formulae, which may be valid exclusively for 20ºC, may have been disregarded. Originality/value For the time being, design methodologies for the safety check of tapered beams for the case of fire are inexistent. This paper investigates the adaptation of existing room temperature design to the fire situation by providing insights on their accuracy level, as well as on how to proceed. Finally, a safe design methodology for tapered beams in case of fire is provided until improved design methods are developed.

Workarounds and trade-offs in information security – an exploratory study

2017 ◽  
Vol 25 (4) ◽  
pp. 402-420 ◽  
Author(s):  
Rogier Woltjer
Keyword(s):  
Information Security ◽  
Exploratory Study ◽  
Design Methodology ◽  
White Collar ◽  
Policy Compliance ◽  
Content Type ◽  
Trade Offs ◽  
Policies And Procedures ◽  
White Collar Workers ◽  
Work Done

Purpose The purpose of this paper is to investigate relationships between workarounds (solutions to handling trade-offs between competing or misaligned goals and gaps in policies and procedures), perceived trade-offs, information security (IS) policy compliance, IS expertise/knowledge and IS demands. Design/methodology/approach The research purpose is addressed using survey data from a nationwide sample of Swedish white-collar workers (N = 156). Findings Responses reinforce the notion that workarounds partly are something different from IS policy compliance and that workarounds-as-improvisations are used more frequently by employees that see more conflicts between IS and other goals (r = 0.351), and have more IS expertise/knowledge (r = 0.257). Workarounds-as-non-compliance are also used more frequently when IS trade-offs are perceived (r = 0.536). These trade-offs are perceived more by people working in organizations that handle information with high security demands (r = 0.265) and those who perform tasks with high IS demands (r = 0.178). Originality/value IS policies are an important part of IS governance. They describe the procedures that are supposed to provide IS. Researchers have primarily investigated how employees’ compliance with IS policies can be predicted and explained. There has been an increased interest in how tradeoffs and conflicts between following policies and other goals lead employees to make workarounds. Workarounds may leave management unaware of how work actually is done within the organization and may besides getting work done lead to new vulnerabilities. This study furthers the understanding of workarounds and trade-offs, which should be subject to further research.

Convention attendance and gaming volume in South Korean casinos

2016 ◽  
Vol 7 (1) ◽  
pp. 66-80 ◽  
Author(s):  
Kristin Malek ◽  
Jungsun (Sunny) Kim
Keyword(s):  
Design Methodology ◽  
Negative Relationship ◽  
Research Model ◽  
Time Series Regression ◽  
Monthly Data ◽  
Content Type ◽  
Independent Variables ◽  
South Korean ◽  
Significant Negative Relationship ◽  
Dependent Variables

Purpose – The purpose of this paper is to advance a theoretical model by estimating the effects of convention attendance on gaming volume (both monthly coin-in and table game drop). Design/methodology/approach – Performance monthly data from two casinos in South Korea are used to test the research model. Specifically, time series regression modeling was performed on the data with the dependent variables including coin-in and table drop and the independent variables including convention attendance and hotel occupancy. Findings – The hotel occupancy variable was found to significantly increase slot coin-in at a rate of 113,603,912 KRW (approximately US$93,500) per month at Casino A. Interestingly, this variable had a significant negative relationship with coin-in per month at Casino B. Meanwhile, the hotel occupancy variable failed to produce any significant effect in the table drop model at both casinos. The convention attendance variable also had no significant effect on both coin-in and table drop at both casinos. Originality/value – This research represents the first attempt to empirically examine the effects of convention attendance on gaming revenues in Asian markets.

National culture and fraud risk: exploratory evidence

2014 ◽  
Vol 12 (2) ◽  
pp. 161-176 ◽  
Author(s):  
Dessalegn Getie Mihret
Keyword(s):  
National Culture ◽  
Design Methodology ◽  
Risk Exposure ◽  
Content Type ◽  
Independent Variables ◽  
Fraud Risk ◽  
Culture Dimensions ◽  
Corruption Index ◽  
High Power Distance

Purpose – The purpose of this paper is to test the association between national culture dimensions and exposure to fraud with a view to drawing implications for understanding fraud risk. Design/methodology/approach – The study is based on a sample of 66 countries. Regression analysis is conducted using Hofstede’s national culture dimensions as independent variables and fraud risk as a dependent variable. Transparency International’s corruption index was used as a proxy for fraud risk. Findings – Results suggest high fraud risk exposure in countries with high power distance and those having limited long-term orientations. Research limitations/implications – The study informs deeper understanding of fraud risk through analysis of fraud risk in a culturally relative sense. Originality/value – This is the first study (known to the author) to draw the implications of national culture for understanding fraud risk.

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