Search results

1 – 10 of 734
Article
Publication date: 26 March 2018

Meng Deng, Yunyi Wang and Peijing Li

The purpose of this paper is to provide the details of developments to research works in the distribution characteristics of the air gaps within firefighters’ clothing and…

Abstract

Purpose

The purpose of this paper is to provide the details of developments to research works in the distribution characteristics of the air gaps within firefighters’ clothing and research methods to evaluate the effect of air gaps on the thermal protective performance of firefighters’ clothing.

Design/methodology/approach

In this paper, the distribution of air gaps within firefighters’ clothing was first analyzed, and the air gaps characteristics were summarized as thickness, location, heterogeneity, orientation and dynamics. Then, the evaluation of the air gap on the thermal protective performance of fighters’ clothing was reviewed for both experimental and numerical studies.

Findings

The air gaps within clothing layers and between clothing and skin play an important role in determining the thermal protective performance of firefighters’ protective clothing. It is obvious that research works on the effects of actual air gaps entrapped in firefighters’ clothing on thermal protection are comparatively few in number, primarily focusing on static and uniform air gaps at the fabric level. Further studies should be conducted to define the characteristic of air gap, deepen the understand of mechanism of heat transfer and numerically simulate the 3D dynamic heat transfer in clothing to improve the evaluation of thermal protective performance provided by the firefighters’ clothing.

Practical implications

Air gaps within thermal protective clothing play a crucial role in the protective performance of clothing and provide an efficient way to provide fire-fighting occupational safety. To accurately characterize the distribution of air gaps in firefighters’ clothing under high heat exposure, the paper will provide guidelines for clothing engineers to design clothing for fighters and optimize the clothing performance.

Originality/value

This paper is offered as a concise reference for researchers’ further research in the area of the effect of air gaps within firefighters’ clothing under thermal exposure.

Details

International Journal of Clothing Science and Technology, vol. 30 no. 2
Type: Research Article
ISSN: 0955-6222

Keywords

Article
Publication date: 15 January 2020

Meng Deng, Miao Tian, Yunyi Wang and Min Wang

The purpose of this paper is to determine the effect of flash fire exposure on the mechanical properties of single-layer thermal protective clothing.

Abstract

Purpose

The purpose of this paper is to determine the effect of flash fire exposure on the mechanical properties of single-layer thermal protective clothing.

Design/methodology/approach

The full-scale flame manikin tests were performed to simulate flash fire exposure. Two typical fire-resistant fabrics were investigated. The manikin was divided into seven body parts and the specimens meeting the requirements of tensile and tear strength standards were sampled. Fabric thickness, mass per unit area, tensile strength and tear strength were measured and analyzed.

Findings

The results revealed the significant influence of heat flux on both of tensile and tear strength. However, the regression analysis indicated the low R2 of the liner models. When the tensile and tear strength retention were reorganized based on the body parts, both of the multiple linear regression models for tensile and tear strength showed higher R2 than the one-variable linear regressions. Furthermore, the R2 of the multiple linear regression model for tear strength retention was remarkably higher than that of the tensile strength.

Practical implications

The findings suggested that greater attention should be paid to the local part of human body and more factors such as the air gap should be considered in the future thermal aging of firefighters’ clothing studies.

Originality/value

The outcomes provided useful information to evaluate the mechanical properties of thermal protective clothing and predict its service life.

Details

International Journal of Clothing Science and Technology, vol. 32 no. 3
Type: Research Article
ISSN: 0955-6222

Keywords

Book part
Publication date: 25 October 2014

Kymberly Drawdy, Meng Deng and Catherine Howerter

The chapter will address comparative teacher preparation programs for teachers who wish to teach in inclusive settings, including those in the United States and People’s…

Abstract

The chapter will address comparative teacher preparation programs for teachers who wish to teach in inclusive settings, including those in the United States and People’s Republic of China. Consideration will be given to developing course objectives and outcomes for teacher preparation programs through the alignment of teacher standards and content standards. Further, discussion will review assessing pre-service teacher candidates for inclusive settings. It will conclude with recommendations for inclusive teacher preparation programs.

Details

Measuring Inclusive Education
Type: Book
ISBN: 978-1-78441-146-6

Keywords

Article
Publication date: 23 November 2012

Wenwei Xue and Hailong Deng

Many mobile devices today are equipped with diversified sensors that enable the acquisition of rich user context (e.g. GPS location, phone activity) for application…

Abstract

Purpose

Many mobile devices today are equipped with diversified sensors that enable the acquisition of rich user context (e.g. GPS location, phone activity) for application utilization. With the growing usage of mobile devices in daily life, the problem of conveniently and promptly searching a piece of content that a user has viewed on his/her device before becomes more and more crucial. This paper aims to propose a context‐based query processing framework called UCQP that supports unstructured queries for content search in a user's access history.

Design/methodology/approach

Beyond the keywords related to the content properties, a context query in the framework is specified with freeform phrases that describe high‐level mobile contexts of the user at a previous time when the user viewed the searched content.

Findings

Experimental results on a prototype system of the framework illustrate its good accuracy and small response time.

Originality/value

To tolerate the incompleteness and inaccuracy in user query texts caused by fading human memory, the authors develop several semantic query parsers that are tailored for different types of contexts using natural language processing and information retrieval techniques. The authors further propose a similarity model to rank the multiple result contents of a query by comparing context entities specified in the query and historical context values associated with each result.

Details

International Journal of Pervasive Computing and Communications, vol. 8 no. 4
Type: Research Article
ISSN: 1742-7371

Keywords

Article
Publication date: 15 August 2016

Kaiyi Chen, Ling T. He and R.B. Lenin

The purpose of this study is to trace time variation paths in risk sensitivities of bank stock returns over the period of 1990-2014, which covers one of most serious…

Abstract

Purpose

The purpose of this study is to trace time variation paths in risk sensitivities of bank stock returns over the period of 1990-2014, which covers one of most serious financial crises in the history of the USA.

Design/methodology/approach

This study programs the flexible least squares (FLS) approach (Kalaba and Testfatsion, 1988, 1989 and 1990) with R, a free statistical computing and graphics software, to estimate the three-factor model developed by He and Reichert (2003) to examine changes in risk sensitivities of bank stocks to the stock market, bond market and real estate market.

Findings

Both FLS and ordinary least squares (OLS) results indicate that the bond market (interest rate) sensitivity of bank stock returns experiences dramatic changes. It is significantly positive before the 2006 subprime mortgage crisis (11/1990 to 5/2006), reduces to insignificant in a short period of 11/2006 to 10/2008 and turns into significantly negative during the period of 11/2008-11/2014. Further, results of this study indicate that bank stocks negatively respond to changes in housing prices in the period of 11/1990-1/1994 and after that the sensitivity turns into significantly positive. The significant shifts in risk sensitivities of banks stock returns coincide with alterations in long-term interest rates and monetary policy, especially the enormously stimulative monetary policy after the financial crisis in 2008.

Originality/value

This study programs the FLS approach with R and uses the FLS approach to demonstrate the time variation paths of risk sensitivities of bank stocks over a period that covers the 2008 financial crisis. The OLS results verify the significant shifts in risk sensitivities suggested by the FLS estimates.

Details

The Journal of Risk Finance, vol. 17 no. 4
Type: Research Article
ISSN: 1526-5943

Keywords

Content available
Book part
Publication date: 25 October 2014

Abstract

Details

Measuring Inclusive Education
Type: Book
ISBN: 978-1-78441-146-6

Book part
Publication date: 25 October 2014

Abstract

Details

Measuring Inclusive Education
Type: Book
ISBN: 978-1-78441-146-6

Article
Publication date: 8 September 2022

Jing Jian Xiao, Jin Huang, Kirti Goyal and Satish Kumar

This study aims to examine the literature on consumer financial capability. By analyzing the research trends, theories, definitions and themes, the literature on financial…

Abstract

Purpose

This study aims to examine the literature on consumer financial capability. By analyzing the research trends, theories, definitions and themes, the literature on financial capability is synthesized, and agenda for future research is suggested. A framework is presented that portrays the antecedents as well as the outcomes of financial capability and their interlinkages.

Design/methodology/approach

Following a systematic approach, the review is based on 215 articles published during January 2007 and–March 2022, retrieved from Scopus. It presents the definitions and theories of financial capability, publication trends, influential articles, prominent authors, prolific journals and countries publishing on financial capability. Using bibliographic coupling, the intellectual structure of the topic is explored, along with offering a framework through content analysis.

Findings

The bibliographic coupling analysis identifies four major clusters of research themes and capability theory appeared to be the most prominent theory. The synthesis draws upon five conceptual definitions of financial capability. Based on the discussion, in this review, financial capability is defined as an individual ability to apply appropriate financial knowledge, perform desirable financial behaviors and take available financial opportunities for achieving financial well-being. A conceptual framework delineates the synthesized literature and propositions based on this framework and relevant research are proposed. Finally, directions for future research are discussed.

Originality/value

This paper is an attempt to offer a comprehensive synthesis of the scholarship on financial capability and its conceptualization. It further proposes an extensive future research agenda. The study has implications for financial services providers relating to retail bank marketing.

Details

International Journal of Bank Marketing, vol. 40 no. 7
Type: Research Article
ISSN: 0265-2323

Keywords

Article
Publication date: 15 July 2019

Roop Lal and R.C. Singh

The purpose of this paper was to carry out an experimental study to investigate tribodynamics at the interface of chrome steel pin with the plain and textured surface cast…

Abstract

Purpose

The purpose of this paper was to carry out an experimental study to investigate tribodynamics at the interface of chrome steel pin with the plain and textured surface cast iron discs in a fully flooded condition.

Design/methodology/approach

A friction and wear tester (tribometer) was used for conducting the experiment at different operating parameters. Lubricating oil used in this experiment was SAE-15W40, which directly supplied at the interface and ensured a fully flooded lubricating condition. Measurements of different parameters, such as friction coefficient, the rate of wear, the amplitude of vibration, rise in temperature and intensity of sound, were considered at different loads. The input parameters were taken in a range viz. Loads from 1.9 MPa to 3.1 MPa, sliding speeds from 2 to 10 m/s and distance travelled ranged from 1000 to 5000 m.

Findings

In the investigation, it was found that there was a decrease in friction coefficient and wear rate at the interface formed by the chrome steel pin with textured surface cast iron disc when compared with friction coefficient and wear rate at the interface formed by the chrome steel pin and the plain surface disc of cast iron.

Originality/value

Also, it was inferred that temperature, vibration and noise level, at the interface formed by the chrome steel pin and plain surface cast iron disc, increased, which governed the interface stability. The novelty of this investigation lies in the identification of the parameters on which interface stability depends.

Details

World Journal of Engineering, vol. 16 no. 4
Type: Research Article
ISSN: 1708-5284

Keywords

Article
Publication date: 5 January 2022

Yonghong Fu, Jie Yang, Hao Wang and Yuyang He

This study aims to investigate the efficacy of micro dimple in inhibiting stick-slip phenomenon on the sliding guideway.

Abstract

Purpose

This study aims to investigate the efficacy of micro dimple in inhibiting stick-slip phenomenon on the sliding guideway.

Design/methodology/approach

In this study, micro-dimples were fabricated by laser on surfaces of steel disk and guideway. The disks and guideways were respectively performed pin-on-disk tribological tests and working condition experiments to study differences in lubrication condition and friction stability between textured and untextured surfaces.

Findings

Micro-dimples help reduce critical sliding speed that allows contact surfaces to enter in hydrodynamic lubrication regime. This increases hydrodynamic lubrication range and narrows speed range where stick-slip phenomenon can occur, enhancing sliding guideway’s adaptability for broader working conditions. Furthermore, friction stability on the textured surface improved, lowering the occurrence possibility of stick-slip phenomenon. Finally, difference between static and kinetic frictions on the textured surface is lower relative to the untextured surface, which decreases the critical velocity when the stick-slip phenomenon occurs.

Originality/value

The results indicate that laser-textured micro-dimples are significantly conducive to inhibit stick-slip phenomenon, thus providing smoother movement for the guideway and eventually increasing precision of the machine.

Details

Industrial Lubrication and Tribology, vol. 74 no. 1
Type: Research Article
ISSN: 0036-8792

Keywords

1 – 10 of 734