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Article
Publication date: 13 June 2016

Doğuş Özkan, M. Barış Yağci, Özgür Birer and Hakan Kaleli

This study aims to evaluate and compare by 100 hours engine bench tests the tribological performances of two types of lubrication oils, which were sulfur-based, boron…

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Abstract

Purpose

This study aims to evaluate and compare by 100 hours engine bench tests the tribological performances of two types of lubrication oils, which were sulfur-based, boron succinimide-containing antiwear package (NP-3) oil and conventional zinc dialkyldithiophosphate (ZDDP)-containing (R-1) oil.

Design/methodology/approach

The tribological performances of the oils were evaluated in three main contexts, including engine tests, physical/chemical changes and surface analysis.

Findings

Results showed that NP-3 lubrication oil, which was environment- and catalyst-friendly, can be an alternative lubrication oil with its tribological performance due to similar antiwear characteristics with the ZDDP.

Originality/value

Attempts to develop catalysis- and environment-friendly antiwear additive packages have not presented popular or commonly used ZDDP-free products for the vehicle industry. This study presents tribological characterization of a newly developed ZDDP-free lubricating oil by engine bench tests.

Details

Industrial Lubrication and Tribology, vol. 68 no. 4
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 10 August 2015

Dogus Özkan, Hakan Kaleli, Yves BERTHIER and Levent Yüksek

This paper aims to investigate the wear mechanisms, formations and effectiveness of tribofilms of new developed, antiwear additive which is called mercapthocarboxylate. The…

404

Abstract

Purpose

This paper aims to investigate the wear mechanisms, formations and effectiveness of tribofilms of new developed, antiwear additive which is called mercapthocarboxylate. The mercapthocarboxylate is a sulphur-based and non-phosphorus additive.

Design/methodology/approach

The effectiveness of the additive was examined through a set of laboratory endurance tests that applied with single cylinder spark ignition engine. Two types of lubricants were used to compare the engine tests which were thiophosphate (ZDDP) containing engine lubricant (phosphorus containing) and mercapthocarboxylate containing non-phosphorus and non-ash crankcase oil. Lubricants were tested under identical operating conditions for 100 hrs. The surfaces of cylinder liner and piston rings were inspected through optical microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy techniques.

Findings

Catalysis-friendly and sulphur-based mercapthocarboxylate additive can be an alternative antiwear additive package for lubrication oil due to better wear performance when compared to ZDDP.

Originality/value

Sulphur-based mercapthocarboxylate is a new developed antiwear additive and was applied to lubrication oil in this study. This lubrication oil was tested in the real engine environment by using 100-hr engine bench tests.

Details

Industrial Lubrication and Tribology, vol. 67 no. 5
Type: Research Article
ISSN: 0036-8792

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Available. Content available
Book part
Publication date: 30 July 2018

Abstract

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Marketing Management in Turkey
Type: Book
ISBN: 978-1-78714-558-0

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Book part
Publication date: 26 May 2022

Khaira Amalia Fachrudin and Fachrudin

Economic growth can be pursued through company performance. However, few companies present negative equity. In Indonesia, some firms with negative equity have positive net income…

Abstract

Economic growth can be pursued through company performance. However, few companies present negative equity. In Indonesia, some firms with negative equity have positive net income and stock returns. This study compares the performance of negative (and positive) equity in the Indonesia Stock Exchange. The observation was conducted from 2019, in marked negative equity notation and two previous periods. It involved all the market negative equity notation companies. We found no significant difference between companies with negative equity and those with positive equity on the asset's efficiency using comparative analysis. The difference relied on the capability of managing the expenses, including interest expenses. Leverage has a positive and significant correlation to assets utilization in companies with negative equity only, while it is insignificant in companies with positive equity. The investors consider the stock companies with negative equity even though the obtained stock returns are not different whether they invested either in the companies with positive or negative equity.

Details

Modeling Economic Growth in Contemporary Indonesia
Type: Book
ISBN: 978-1-80262-431-1

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Book part
Publication date: 6 December 2024

Burcin Hatipoglu and Bengi Ertuna

In this chapter, we analyze the interplay between the traditional conception of corporate social responsibility (CSR) and international norms and initiatives to understand…

Abstract

In this chapter, we analyze the interplay between the traditional conception of corporate social responsibility (CSR) and international norms and initiatives to understand business engagement with the development agenda. Drawing on empirical evidence from 50 publicly listed companies, this article delineates the conditions under which CSR can play a constructive role in engaging with grand challenges, addressing development agenda and public policy gaps in a developing country, Türkiye. We defined and used four CSR dimensions to portray the companies’ response to the development agenda: integration with the core business, the extent of reach, instruments for implementation, and collaboration with external partners. Findings indicate that companies acting in line with the local conception of CSR by adopting a social mission beyond business display alignment of their CSR strategy with the global sustainable development agenda by adopting international norms and initiatives.

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Responsible Firms: CSR, ESG, and Global Sustainability
Type: Book
ISBN: 978-1-83753-963-5

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Article
Publication date: 2 February 2024

Osman Seray Özkan, Burcu Üzüm and Yasemin Gülbahar

The aim of this research, which is based on social identity theory (SIT), is to investigate the effect of leader vision (LV) and crab syndrome (CS) on creativity. The impact of LV…

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Abstract

Purpose

The aim of this research, which is based on social identity theory (SIT), is to investigate the effect of leader vision (LV) and crab syndrome (CS) on creativity. The impact of LV and CS, as well as psychological ownership (PO), on creativity is examined. It is also to determine the mediating role of PO and the moderating role of instrumental climate (IC) in these relationships.

Design/methodology/approach

The research was carried out with the quantitative research method by adopting the screening design. Deductive logic approach was used to develop hypotheses and theoretical framework. The textile sector, where the emphasis on creativity is at the forefront, was chosen as an example. Data without common method variance (CMV) error were analyzed by structural equation modeling (SEM).

Findings

The results of the research show that LV is positively related to creativity, while CS is negatively related to creativity. Additionally, a positive correlation has been identified between PO and creativity. It has been revealed that PO has a mediation role in the relationship between the LV and creativity, and the relationship between the CS and creativity. It has been also determined that IC has a moderator role between the LV and PO.

Originality/value

This study introduces a novel perspective on creativity through the integration of the LV and CS concepts. Furthermore, it contributes significantly to the existing creativity literature by examining the impact of PO on creativity and the mediating role of PO.

Details

Journal of Management Development, vol. 43 no. 3
Type: Research Article
ISSN: 0262-1711

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Article
Publication date: 17 December 2024

Festus Victor Bekun, Ashutosh Yadav, Joshua Chukwuma Onwe, Michael Provide Fumey and Mahsum Ökmen

Over the last decades, the need for sustainable energy production and consumption has been heavily discussed. However, there has been no consensus in the extant literature. Thus…

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Abstract

Purpose

Over the last decades, the need for sustainable energy production and consumption has been heavily discussed. However, there has been no consensus in the extant literature. Thus, to this end, this study aims to explore the long-run and causality connection among disaggregated energy consumption, environmental tax and economic growth in a carbon-function framework for Turkey.

Design/methodology/approach

This study uses annual frequency data for econometrics analysis. To this end, our analysis utilizes the autoregressive distributive lag (ARDL) technique for cointegration and long-run analysis, while the Granger causality was used for causality direction.

Findings

Economic growth drives Turkey’s Load Capacity Factor (LCF), indicating energy efficiency is linked to economic performance. Renewable energy boosts LCF, while nonrenewable energy hinders it. Population growth positively affects energy efficiency, but environmental taxes have minimal impact, suggesting policy reform is needed. These outcomes have far-reaching implications for macroeconomic policies and environmental sustainability in Turkish economy energy mix amidst its growth path.

Research limitations/implications

The findings suggest the need for policy reforms prioritizing renewable energy investments to enhance Turkey’s energy efficiency and sustainability. Additionally, the current environmental tax structure requires reevaluation to support sustainable energy practices better. These policy changes are crucial for balancing Turkey’s economic growth with environmental goals, ensuring a more sustainable energy future.

Originality/value

This study explores the role of government policy in form of environmental tax in environmental performance in Turkey.

Details

International Journal of Energy Sector Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1750-6220

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Article
Publication date: 19 May 2023

Hayat Ayar Şentürk and Kaan Tuğrul Özkan

The logic of value innovation has received increased attention in the strategic marketing and innovation literature. Studies investigating how value innovation, as a firm’s…

393

Abstract

Purpose

The logic of value innovation has received increased attention in the strategic marketing and innovation literature. Studies investigating how value innovation, as a firm’s strategic mindset, contributes to creating new market space through more proximal market-driven factors such as strategic decisions and customer value are still lacking, nevertheless. This study aim to investigate how the logic of value innovation influences creating new market space through quantum strategy and customer value creation.

Design/methodology/approach

Survey data from a sample of 204 manufacturing and service firms was used to test the conceptual model and research hypotheses. The data were analyzed using structural equation modeling.

Findings

The findings reveal the direct and indirect effect of value innovation logic on the new market space through the mediation of quantum strategy and customer value creation. Besides, this study shows that quantum strategy does not directly contribute to customer value creation. A reason is that the quantum strategy as a both/and strategy is the more dominating factor in creating new market space.

Originality/value

There is still a lack of a systematic understanding of how value innovation, as a firm’s strategic mindset, contribute to creating new market space through a firm’s strategic choices and superior customer value creation, as more proximal market-driven factors. This study empirically attempted to address this research problem. This study contributes to the strategic marketing literature by providing a model for the interwoven relationships between value innovation, quantum strategy, customer value and new market space.

Details

Journal of Business & Industrial Marketing, vol. 38 no. 12
Type: Research Article
ISSN: 0885-8624

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Article
Publication date: 15 June 2021

Mustafa Kırca and Şerif Canbay

This study aims to investigate whether changes in consumer interest rate, exchange rate and housing supply have permanent effects on housing inflation in Turkey.

879

Abstract

Purpose

This study aims to investigate whether changes in consumer interest rate, exchange rate and housing supply have permanent effects on housing inflation in Turkey.

Design/methodology/approach

For this purpose, data from 2010M01 to 2020M06 and changes in consumer interest rate, exchange rate, housing supply and housing inflation were used. Relationships between variables are analyzed first by the Granger causality tests and then the conditional frequency domain causality tests. The conditional frequency domain causality test specifically reveals the permanent causality between variables, whether there is a permanent effect.

Findings

According to the Granger causality test results, there are causality relationships from changes in the consumer interest rate and exchange rate to housing inflation. However, there is no causality relationship between housing supply and housing inflation. According to the conditional frequency domain causality test results, there is causality for the permanent and mid-term from changes in the consumer interest rate to housing inflation and causality for the mid-term and temporary from changes in the exchange rate to housing inflation. Additionally, it was found that there are causality relationships between changes in the consumer interest rate and changes in the exchange rate.

Research limitations/implications

The first limit of the study is that only 2010M01-2020M06 months can be considered. Because the date that variables started common is 2010M01. Besides, there is a limit in the study in variables used. Many variables, both micro and macro, can be added to affect housing inflation.

Originality/value

Housing inflation is a remarkable issue in Turkey. There is an increase in the number of studies on the subject in recent years. For this reason, the study is trying to contribute by approaching the subject from a different angle. The most important contribution of the study is that it has not been investigated whether the determinants of housing inflation have permanent or temporary effects, which were not done in previous studies. In addition, the method used reveals how many months the effects of changes in exchange rates, consumer interest rates and housing supply on housing inflation last. Based on the findings obtained from the methods, important economic and political implications have been put forward in depth.

Details

International Journal of Housing Markets and Analysis, vol. 15 no. 2
Type: Research Article
ISSN: 1753-8270

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Article
Publication date: 17 October 2016

Rotimi Boluwatife Abidoye and Albert P.C. Chan

The emerging trend in the global real estate valuation practice has led to the development of advanced valuation approaches to replace the traditional methods. The purpose of this…

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Abstract

Purpose

The emerging trend in the global real estate valuation practice has led to the development of advanced valuation approaches to replace the traditional methods. The purpose of this paper is to investigate the extent to which real estate valuers practicing in Nigeria are aware and use these advanced approaches in real estate valuation practice.

Design/methodology/approach

Both traditional and advanced approaches were identified from the literature. An online-based questionnaire survey was administered on estate surveyors and valuers to measure their level of awareness and frequency of use of the identified valuation approaches. The feedback was collated and analyzed using descriptive statistical analysis.

Findings

The professionals are mostly aware of the traditional methods and always use the “sales comparison method” in practice. In contrast, they are not very aware of the advanced approaches and hence, only use the hedonic pricing model occasionally in practice.

Research limitations/implications

The study only focuses on the Lagos metropolis, a nationwide survey will produce more comfortable generalizable findings.

Practical implications

This is a wake-up call for the real estate regulatory bodies and indeed all the real estate professionals in Nigeria to embrace the use of the advanced valuation approaches in practice, in order to remain relevant in the international real estate practice.

Originality/value

Implementation of the recommendations of this study could help position the Nigerian real estate professionals and the industry for a global exposition.

Details

Property Management, vol. 34 no. 5
Type: Research Article
ISSN: 0263-7472

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