Tribological properties of brake friction materials containing fly ash
Sugözü, Banu
Purpose The purpose of this study is to investigate the potential of fly ash in automotive brake lining materials. Design/methodology/approach Three brake linings containing fly ash (36, 41 and 46 Wt.%) were designed and produced by dry-mixing, pre-forming and hot pressing. The surface hardness of all brake lining samples was measured by using Brinell hardness tester. The density of the specimens was determined based on Archimedean principle in water. The friction and wear characteristics of the brake lining samples were determined using a real brake disc-type tester. Detailed examinations on the worn surface were analyzed using a scanning electron microscopy. Findings Fly ash can be good alternative as space filler to reduce the cost for brake lining. Originality/value The present study h...
Staff shortages in hospitality and tourism industries: how technology influences?
Birdir, Kemal | Birdir, Sevda
Purpose - This paper offers an introduction and sets the stage for the theme issue. It describes the methodology used and highlights the articles that address the strategic question of how hospitality and tourism industries can minimize the effects of labor shortages by embracing advanced technologies. Design/methodology/approach - This special issue explores the potential of automation, artificial intelligence, robotics and advanced data analytics in mitigating staff shortages. Automation streamlines operations, AI enhances customer interactions, robotics reimagines service delivery and data analytics informs strategic decisions. The study addresses a strategic question by combining literature reviews, data analysis, expert insights from practitioners and practical solution recommendation...
Non-invasive vagus nerve stimulation in a hungry state decreases heart rate variability
Büyükgüdük, ilkim | Yanık, Hüseyin | Yılmaz, Dilan Dneiz | Yar, Berçem | Değirmenci, Evren | Dal, Uğur | Geraldine Veldhuizen, Maria
Vagus nerve signals from the gut to brain carry information about nutrients and drive food reward. Such signals are disrupted by consuming large amounts of high-calorie foods, necessitating greater food intake to elicit a similar neural response. Non‐invasive vagus nerve stimulation (nVNS) via a branch innervating the ear is a candidate treatment for obesity in humans. There is disagreement on the optimal location of nVNS in the ear for experimental and clinical studies. There are also no studies comparing nVNS in hungry and post-prandial states. We aimed to compare ear position(s) for nVNS and explore the effects of nVNS during hungry and post-prandial states on proxies for autonomic outflow (heart-rate variability) and efferent metabolism (gastric wave frequency and resting energy expend...
Are we confident with our food: drivers affecting consumer’s food fraud avoidance behavior for milk and dairy products
Ayşe Şahin | Gizem Aydan | Arzu Seçer
Abstract Purpose – Food fraud presents serious threats to public health and the environment, compromising ethical standards and highlighting significant issues within the framework of the United Nations’ Sustainable Development Goals. This study aims to reveal the impact of consumers’ perceptions, awareness, values and information sharing within an integrated model on their behavior in avoiding fraudulent products. Design/methodology/approach – Primary data were collected through an online survey with a sample size of 400 individuals. Structural equation modeling was used to have a better understanding of factors influencing consumers’ avoidance behaviors regarding fraudulent milk and dairy products. Findings – Almost all consumers reported having heard of food fraud, with more than hal...
Effect of the size on the friction characteristics of brake friction materials: a case study with Al2O3
Sugözü, Banu
Purpose The purpose of this paper is to study the potential of alumina (Al2O3) in nanometer size in automotive brake friction materials. Design/methodology/approach Four brake linings containing alumina differing in particle size (355 µm and 80 nm) and various amount (5 and 10 Wt.%) were designed and produced. The hardness, density and porosity of the samples were measured. All samples were tested on a full-scale brake dynamometer with gray cast iron disc to determine the tribological properties. Detailed examinations on the worn surface were analyzed using a scanning electron microscopy. Findings It was concluded that all performance parameters were beneficially affected because of nano alumina. Originality/value This paper emphasizes the importance of nano-composites in the automotive in...
Conclusion: addressing the labor shortage problem in the hospitality and tourism industries
conclusion
Birdir, Kemal | Birdir, Sevda
Purpose - The main objective of this theme issue is to investigate the potential of cutting-edge technologies like AI, robotics and other innovative solutions to mitigate the skilled labor shortage crisis in the Hospitality and tourism (H&T) industries. Design/methodology/approach - This conclusion draws upon the collective insights from the articles in this thematic issue, providing a comprehensive overview of the key findings and their implications. A thorough analysis and discussion of the results are presented, offering a synthesis of the research and its significance for the hospitality and tourism industry. Findings - This thematic issue examines the profound impact of automation and artificial intelligence on the tourism and hospitality industries, where advancements in technology a...
The effect of colemanite on the friction performance of automotive brake friction materials
Sugözü, İlker | Sugözü, Banu
Purpose The purpose of this paper is to investigate use of colemanite (C) upon friction and wear performance of automotive brake lining. Brake lining production with the boron product colemanite addition and braking characterization investigated for development of non-asbestos organic (NAO) brake lining because of negative effects on human health and environmental hazard of asbestos containing linings. During the braking, brake lining is warmed up extremely due to friction, and the high temperature causes to decreasing of breaking performance. Colemanite has high melting temperature, and this makes this material valuable for brake lining. Design/methodology/approach This study investigated the effect of colemanite (C) upon friction and wear performance of automotive brake lining. Based on ...
Friction and wear properties of friction materials containing nano/micro-sized SiO2 particles
Sugözü, Banu
Purpose Among the components used for a car brake lining, the chemical and structural properties of the abrasives, jointly with the morphology and size of the particles influence the friction parameters and stability of the composite. This paper aims to investigate the effect of nano SiO2 particles in brake pads on friction and wear properties. Design/methodology/approach In this paper, the effects of SiO2 (Silica) particles of varying size on the friction-wear properties of polymeric friction composites are investigated. Four friction composites were prepared containing (5, 10 Wt.%) micro silica (MS) particles and (5, 10 Wt.%) nano silica (NS) particles. The samples were produced by a conventional procedure for a dry formulation following dry-mixing, pre-forming and hot pressing. Friction...
Production of boric acid added brake friction composite and the effect of heat treatment on braking characterization
Sugözü, İlker | Sugözü, Banu
Purpose The purpose of this study was to investigate the use of boric acid as a friction modifier material in brake friction composites and to determine the effect of heat treatment applied during production on braking performance. Design/methodology/approach The addition of five different amounts of boric acid was balanced with cashew, which is in the friction modifier material group. The samples were produced in the following order: dry mixing, preforming and hot-pressing. The effect of the heat treatment that can be applied after the hot-pressing process on the braking performance was investigated. The tribological and physical properties of the samples were determined using tests performed according to appropriate standards. The microstructures of the friction surfaces were investigate...