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1 – 10 of 26
Article
Publication date: 21 June 2019

Ömer Özdemir, Felix Fischer, Adrian Rienäcker and Katharina Schmitz

The purpose of this paper is to show these effects in an abstracted micro gap test bench. Because of stronger emission laws, the ambition to raise the rail pressure in common-rail…

Abstract

Purpose

The purpose of this paper is to show these effects in an abstracted micro gap test bench. Because of stronger emission laws, the ambition to raise the rail pressure in common-rail systems from the current 2500 bar to 3000 bar is a given. The pressure increase will allow fine atomization of fuel and therefore more efficient combustion. But within the technical system of the high-pressure pump, stronger thermal stresses of the piston–cylinder contact are expected. A pressure drop from such a high level causes high temperature gradients due to energy dissipation.

Design/methodology/approach

For a detailed examination, the critical piston–cylinder contact has been investigated in an abstracted test bench with a flat parallel gap and an equivalent thermo-elastohydrodynamic simulation model.

Findings

The simulation results show good accordance to the measurements of pressures, temperatures and leakages for pressures up to 3000 bar. Comparison with elastohydrodynamic lubrication results outlines the need to consider temperature and pressure effects viscosity and solid deformation for the simulation and design of tribological contacts at high pressures.

Originality/value

This paper describes a simulation method with high accuracy to investigate tribological contacts considering temperature effects on solid structures and the fluid film. The thermo-elastohydrodynamic lubrication simulation method is valid not only for piston–cylinder contacts in high-pressure pumps but also for journal bearings in combustion engines.

Details

Industrial Lubrication and Tribology, vol. 71 no. 5
Type: Research Article
ISSN: 0036-8792

Keywords

Abstract

Purpose

This paper aims to determine the knowledge and attitudes of the physicians regarding human immunodeficiency virus (HIV)/acquired immune deficiency syndrome (AIDS), to emphasize that these patients exist and they will exist in the future and to raise awareness so as to prevent that their rights to treatment are revoked.

Design/methodology/approach

The survey was conducted via a link sent through an online system. Random physicians from 81 cities of the country were invited to the survey. The survey has 41 questions regarding knowledge and attitudes in total, including epidemiological information such as age, gender and title.

Findings

A total of 3,107 physicians has voluntarily participated in the study. In total, 2,195 (70.7%) are internal physicians and 912 (29.3%) are surgical physicians among the participant physicians. In total, 1,452 (46.7%) of the participants are specialist physicians, 608 (19.6%) of the participants are practising physician and the rest of it is physician assistants, academicians and dentists, respectively.

Originality/value

In this study, it has been found out that the physicians have a lack of knowledge on HIV/AIDS and they adopt a discriminatory attitude towards HIV-positive persons. HIV-positive patients who are exposed to discrimination and scared of being uncovered refrain from applying to hospitals for treatment, which puts public health into jeopardy due to the high viral load and these patients are faced with difficulties in coping with both medical and emotional load of the disease.

Details

International Journal of Human Rights in Healthcare, vol. 17 no. 1
Type: Research Article
ISSN: 2056-4902

Keywords

Article
Publication date: 27 August 2024

Ömer Tuğsal Doruk

This study aims to explore a novel framework for housing price bubbles in the Turkish economy during the pandemic. It examines the probability of housing bubble formation relative…

Abstract

Purpose

This study aims to explore a novel framework for housing price bubbles in the Turkish economy during the pandemic. It examines the probability of housing bubble formation relative to the pre-pandemic period and identifies possible determinants of housing bubbles in the Turkish economy.

Design/methodology/approach

In this study, a two-stage novel estimation method is applied. In the first stage, bubble periods are identified through the right-tailed supremum augmented Dickey–Fuller test. In the second stage, the determinants of these bubbles are identified, and the housing bubble determinants during the COVID-19 pandemic are compared to the pre-pandemic period.

Findings

The findings indicate that there is an asset price bubble in the housing market during the pandemic period. Furthermore, mortgage credit expansion, mortgage credit rates and the depreciation of the Turkish Lira against the USD could increase housing bubble formation. However, housing sector sales to foreign investors do not contribute to housing bubble formation during the pandemic in the Turkish housing market.

Originality/value

To the best of the author’s knowledge, this is the first study to address the relative determinants of housing bubbles in an emerging market context during the pandemic.

Details

International Journal of Housing Markets and Analysis, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1753-8270

Keywords

Book part
Publication date: 13 May 2021

Omer Sarac

In today's globalising conditions, tourism is marketed as a combined product because the demand for tourism increases as the product differs. It is very difficult for tourism…

Abstract

In today's globalising conditions, tourism is marketed as a combined product because the demand for tourism increases as the product differs. It is very difficult for tourism destinations, which emerge as a result of the combination of attractiveness, accessibility, tourism businesses, activity and image elements, to survive because tourism destination stakeholders have different goals and objectives. Therefore, there is a need for an effective destination management in which management functions (planning, organising, coordination, commanding (leading) and control) will be employed. Together with the destination management, stakeholders with different goals and objectives are expected to operate in line with a common goal. The clustering of tourism businesses, one of the stakeholders of the tourism destination, plays a very important role in the emergence of destination management. In addition, this situation causes businesses to act not only in line with their own interests but also in the interests of the destination. While avoiding activities that would endanger the existence of the destination with the unions they establish, they cause local administrations and fund managers to act in line with the infrastructure, superstructure and development opportunities needed. In addition to this, while ensuring the use and protection of social capital in that region, it also enables the development of intellectual capital. On the other hand, it causes the opening of new main and auxiliary enterprises and plays an active role in increasing the welfare level of the region. Therefore, clustering is very important in successful destination management.

Details

Overtourism as Destination Risk
Type: Book
ISBN: 978-1-83909-707-2

Keywords

Article
Publication date: 7 November 2024

Ömer Tuğsal Doruk

This paper aims to study the effect of short-term firm-level exposure on managerial change during the COVID-19 pandemic in the Chinese economy. Such a link is not explored in the…

Abstract

Purpose

This paper aims to study the effect of short-term firm-level exposure on managerial change during the COVID-19 pandemic in the Chinese economy. Such a link is not explored in the existing COVID-19 and resource-based theory (RBT) literature.

Design/methodology/approach

The logit regression model is utilized to examine the effect of short-term exposure on the probability of managerial change in the Chinese economy. Logit models based on coarsened exact matching (CEM) are also used in the robustness checks part of the study. The results are robust to different specifications.

Findings

The obtained findings show that short-term exposure has a significantly positive effect on the probability of managerial change during the pandemic.

Research limitations/implications

Under the RBT approach, this study sheds new light on the relationship between short-term financial exposure and managerial change under uncertainty during the pandemic.

Practical implications

C-Suite executives need to be prepared for short-term sudden shocks. According to the findings of the study, the relationship between short-term sudden shocks and short-term financial exposure is a factor that C-suite executives should pay attention to.

Social implications

Short-term sudden shocks can support managerial change, pushing society into uncertainty and negatively affecting the private sector. In this context, it has a structure that can amplify uncertainty.

Originality/value

In the existing COVID-19 literature, the effect of short-term exposure on the probability of managerial change is under researched, especially in the emerging markets-based RBT and COVID-19 literature. The present study offers an insight into the link between short-term exposure and the probability of managerial change during the pandemic.

Details

Leadership & Organization Development Journal, vol. 46 no. 1
Type: Research Article
ISSN: 0143-7739

Keywords

Content available
Book part
Publication date: 4 July 2019

Abstract

Details

Contemporary Issues in Behavioral Finance
Type: Book
ISBN: 978-1-78769-881-9

Article
Publication date: 27 June 2022

Omer Cayirli, Koray Kayalidere and Huseyin Aktas

The purpose of this paper is to investigate the impact of changes in credit stock on real and financial indicators in Turkey with a focus on conditional and time-varying dynamics.

Abstract

Purpose

The purpose of this paper is to investigate the impact of changes in credit stock on real and financial indicators in Turkey with a focus on conditional and time-varying dynamics.

Design/methodology/approach

In addition to lag-augmented vector autoregression (LA-VAR) based time-varying Granger causality tests, threshold models and a research setting that identifies high/low states of credit growth based on 24-month moving averages are used to explore regime-dependent behavior. For investigating the asymmetric dynamics, the authors use a methodology that identifies good/bad news in credit growth based on 24-month moving averages and standard deviations.

Findings

Results strongly suggest that the impact of changes in credit stock induces conditional responses. Moreover, we find evidence for asymmetric responses. In the case of Turkey, efforts to spur growth through credit produce a strong negative byproduct, a depreciation in the exchange rate. The authors also find that changes in credit stock have become more relevant for uncertainties in inflation and exchange rate expectations, particularly in the era after mid-2018 in which credit growth volatility has increased noticeably.

Originality/value

This study provides a comprehensive analysis of time-varying and conditional responses to a change in credit stock in a major emerging economy. Using a moving threshold based only on the available information in the analysis of state-dependency represents a new approach.

Details

International Journal of Emerging Markets, vol. 19 no. 2
Type: Research Article
ISSN: 1746-8809

Keywords

Article
Publication date: 3 January 2017

Ömer Faruk Ursavaş and Ilknur Reisoglu

The purpose of this paper is to explore the validity of extended technology acceptance model (TAM) in explaining pre-service teachers’ Edmodo acceptance and the variation of…

1071

Abstract

Purpose

The purpose of this paper is to explore the validity of extended technology acceptance model (TAM) in explaining pre-service teachers’ Edmodo acceptance and the variation of variables related to TAM among pre-service teachers having different cognitive styles.

Design/methodology/approach

Structural equation modeling approach was used to analyze an extended TAM that represents the relationship between the eight constructs and cognitive style. Group Embedded Figures Test and technology acceptance measure were used as data collection tools. The study was conducted with 129 pre-service teachers.

Findings

The results indicate that perceived ease of use (PEU) influences behavioral intention (BI) to use Edmodo indirectly through attitude toward Edmodo use and perceived usefulness (PU). Technological complexity and facilitating conditions influence BI to use indirectly through PU and PEU, respectively. Thus, the extended TAM is a parsimonious model explaining 75, 72, and 82 percent of the endogenous variable (BI) for the whole sample, for the field dependent sample, and for the field independent sample, respectively.

Originality/value

This paper addresses to determine the BI of pre-service teachers regarding Edmodo, which is an innovative tool, based on cognitive styles.

Details

The International Journal of Information and Learning Technology, vol. 34 no. 1
Type: Research Article
ISSN: 2056-4880

Keywords

Article
Publication date: 14 November 2008

George K. Stylios

Examines the fourteenth published year of the ITCRR. Runs the whole gamut of textile innovation, research and testing, some of which investigates hitherto untouched aspects…

1278

Abstract

Examines the fourteenth published year of the ITCRR. Runs the whole gamut of textile innovation, research and testing, some of which investigates hitherto untouched aspects. Subjects discussed include cotton fabric processing, asbestos substitutes, textile adjuncts to cardiovascular surgery, wet textile processes, hand evaluation, nanotechnology, thermoplastic composites, robotic ironing, protective clothing (agricultural and industrial), ecological aspects of fibre properties – to name but a few! There would appear to be no limit to the future potential for textile applications.

Details

International Journal of Clothing Science and Technology, vol. 20 no. 6
Type: Research Article
ISSN: 0955-6222

Keywords

Article
Publication date: 24 January 2025

Muhammad Arshad, Sadia Afzal, Mariam Farooq, Omer Farooq and Muhammad Atif

This paper aims to investigate the impact of organizational identification on employees’ usage of newly introduced Accounting Information Systems (AIS), with a particular focus on…

Abstract

Purpose

This paper aims to investigate the impact of organizational identification on employees’ usage of newly introduced Accounting Information Systems (AIS), with a particular focus on the mediating influence of attitude and the moderating roles of gender and collectivism. Drawing on social identity theory, the research framework was developed.

Design/methodology/approach

Data were collected using a survey method from 500 service sector employees adapting to a newly implemented AIS. Structural equation modeling (SEM) in Mplus was used for the model testing.

Findings

The results indicate that organizational identification does not directly influence employees’ AIS usage. Nevertheless, the study findings demonstrate that it exerts an indirect influence on employees’ AIS usage through the mediation of their attitude toward the using of new AIS. The moderation of gender and collectivism emerged as crucial, showing the strongest effect of organizational identification on AIS usage among highly collectivist female employees, followed by highly collectivist male employees, and then less collectivist female employees. This relationship is weakest in less collectivist male employees.

Originality/value

To the best of the authors’ knowledge, this investigation stands as the first to integrate social identity theory with cultural values and the gender of employees, offering insights into the employees’ AIS usage.

Details

Journal of Accounting & Organizational Change, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1832-5912

Keywords

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