Development of a mini-tribometer for in-situ observation of subsurface and the corresponding experiments

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Chen Li ◽  
Heng Wen ◽  
Kun Chen ◽  
Longxiao Zhang ◽  
Ting Xie ◽  
...  
Keyword(s):  
Wear Mechanism ◽  
Design Methodology ◽  
Material Design ◽  
In Situ Observation ◽  
Content Type ◽  
The Matrix ◽  
Frictional Interface ◽  
Dynamic Wear ◽  
Peeling Off

Purpose This paper aims to develop a Mini-Tribometer for in-situ observation of subsurface. Design/methodology/approach To observe the change of the microstructure during wear in real time, an in-situ observation mini-tribometer was developed according to the requirements of the basic frictional experiments and carried out the verification experiments. Findings The subsurface images and the tribological data obtained from the mini-tribometer clearly show that the graphite in the matrix moves to the surface and takes part in lubrication mainly in the form of extrusion and peeling off, and the migration of graphite in the copper-based composite to the frictional interface to act as lubricant and to result in the decrease of the friction coefficient. The experimental results of the developed tribometer are accurate, which can provide important references for further research on the wear mechanism of materials. Originality/value The developed in-situ observation mini-tribometer can be used to observe the dynamic wear mechanism of the frictional pairs, which is very important for optimization of material design and tribological performances.

Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

2020 ◽  
Vol 11 (6) ◽  
pp. 861-873
Author(s):  
Ş. Hakan Atapek ◽  
Spiros Pantelakis ◽  
Şeyda Polat ◽  
Apostolos Chamos ◽  
Gülşah Aktaş Çelik
Keyword(s):  
Design Methodology ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Lower Stress ◽  
Content Type ◽  
Hardened Alloy ◽  
Zr Addition ◽  
Nucleation Sites ◽  
The Matrix ◽  
Lower Stress Level

Purpose The purpose of this paper is to investigate the fatigue behavior of precipitation-strengthened Cu‒2.55Ni‒0.55Si alloy, modified by the addition of 0.25 Cr and 0.25 Zr (wt%), using mechanical and fractographical studies to reveal the effect of microstructural features on the fracture. Design/methodology/approach For strengthening, cast and hot forged alloy was subjected to solution annealing at 900°C for 60 min, followed by quenching in water and then aging at 490°C for 180 min. Precipitation-hardened alloy was exposed to fatigue tests at R=−1 and different stress levels. All fracture surfaces were examined within the frame of fractographical analysis. Findings Fine Ni-rich silicides responsible for the precipitation strengthening were observed within the matrix and their interactions with the dislocations at lower stress level resulted in localized shearing and fine striations. Although, by the addition of Cr and Zr, the matrix consisted of hard Ni, Zr-rich and Cr-rich silicides, these precipitates adversely affected the fatigue behavior acting as nucleation sites for cracks. Originality/value These findings contribute to the present knowledge by revealing the effect of microstructural features on the mechanical behavior of precipitation-hardened Cu‒Ni‒Si alloy modified by Cr and Zr addition.

Hedonic experiences at heritage attractions: the visitor’s perspective

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ana Carolina Bender ◽  
Manuela Guerreiro ◽  
Bernardete Dias Sequeira ◽  
Júlio Mendes
Keyword(s):  
Design Methodology ◽  
Theory And Practice ◽  
Structured Interviews ◽  
Content Type ◽  
Heritage Sites ◽  
Exploratory Approach ◽  
Hedonic Experience ◽  
Using Data

Purpose The purpose of this study is to explore the hedonic experience and its formation at heritage attractions. Design/methodology/approach A qualitative and exploratory approach was applied, using data from 21 semi-structured interviews and three in-situ focus groups. Findings Findings highlight that senses, imagery and emotions are stimulated by the physical landscape and by triggers of memorable experiences. Research limitations/implications To further explore this topic, a broader range of heritage attractions and perspectives from the diverse stakeholders involved in the management and consumption of these sites is needed. Originality/value Given the scarcity of research dedicated to the hedonic experience at heritage sites, this study provides a contribution by exploring the visitor’s perspective and points out relevant insights. As the hedonic feelings of pleasure, comfort and related affective responses impact the quality of memorable experiences, relevant implications for theory and practice are discussed.

Service quality function deployment by the C-shaped QFD 3D matrix

2018 ◽  
Vol 25 (9) ◽  
pp. 3386-3405 ◽  
Author(s):  
Maryam Hassani ◽  
Arash Shahin ◽  
Manouchehr Kheradmandnia
Keyword(s):  
Quality Function Deployment ◽  
Design Methodology ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Customer Requirements ◽  
Content Type ◽  
Process Characteristics ◽  
The Matrix ◽  
3D Matrix ◽  
Simultaneous Comparison

Purpose The purpose of this paper is to examine the application of C-shaped QFD 3D Matrix in comparing process characteristics (PC), performance aspects (PA) and customer requirements, simultaneously and to prioritize the first two sets, respectively. Design/methodology/approach A three dimensional matrix has been developed with three sets of PC, PA and customers’ requirements and C-shaped matrix has been applied for simultaneous comparison of the dimensions and prioritization of the subsets of PC and PA. The proposed approach has been examined in a post bank. Findings Findings confirm the possibility of simultaneous comparison and prioritization of the three sets of dimensions of this study in post bank services. In addition, “growth and learning” and “bilateral relationship with suppliers” had the first priorities among PA and PC, respectively. Research limitations/implications While the proposed approach has many advantages, filling the matrixes is time-consuming. Since illustrating the 3D matrix was not possible, the matrix was separated into five two-dimensional matrixes. Originality/value Compared to the studied literature, the proposed approach is practically new in the post bank services.

scholarly journals Recapitulation of the relationship between economic thoughts and realities

2019 ◽  
Vol 2 (1) ◽  
pp. 123-135
Author(s):  
Hua Liang
Keyword(s):  
Economic History ◽  
Design Methodology ◽  
Economic Thought ◽  
Content Type ◽  
Economic Problems ◽  
Root Cause ◽  
New Ideas ◽  
Economic Thinking ◽  
The Relationship

Purpose It is rather common for China’s current academic circles to use western doctrines that originated in situ to explain China’s economic problems, a suspicion of scenario misplacement may thus arise. The root cause lies in the lack of reflection about the current relationship between economic thoughts and realities. The paper aims to discuss these issues. Design/methodology/approach Correctly understanding economic thoughts associated with the brand of “that era” and effectively deducing its characteristics is of great significance to finding new features of this era and constructing new ideas with the characteristics of “this era.” Findings This motif is exactly the keynote on which to base the study of economic history and economic thought. Originality/value In a period of major historical turning points, the economic realities on which the economic thinking about that era (the era of economists) relied was undergoing major changes, and re-emphasizing the ancient topic of the relationship between economic thoughts and economic realities became particularly urgent.

SEM In Situ Investigation on Fatigue Cracking Behavior of X80 Pipeline Steel with Inclusions

2011 ◽  
Vol 284-286 ◽  
pp. 1096-1100 ◽  
Author(s):  
Ke Tong ◽  
Yan Ping Zeng ◽  
Xin Li Han ◽  
Yao Rong Feng ◽  
Xiao Dong He
Keyword(s):  
Crack Initiation ◽  
Pipeline Steel ◽  
Fatigue Cracking ◽  
Fatigue Loading ◽  
In Situ Observation ◽  
X80 Pipeline Steel ◽  
Cracking Behavior ◽  
The Matrix ◽  
Extension Period

The micro-mechanical behavior of inclusions in X80 pipeline steel under fatigue loading was investigated by means of SEM in situ observation. The influence of sizes and shapes of inclusion on crack initiation and propagation was analyzed. The result shows that for large-size single-particle inclusion, cracks initiate from the interior under the fatigue loading. When a certain circulation cycles are reached, cracks initiate at the matrix near the sharp corner of the inclusion. The cracks extend at the matrix during the stable extension period and unstable extension period following the crack initiation, until fracture occurred. For chain inclusion, cracks first initiate at the interface between inclusion and matrix within the chain area, and the circulation cycles needed for initiation are far less than single inclusion. Cracks steadily extend after the initiation, and then fracture after very short circulation cycles. A chain of inclusion with the shape corners is serious harmful to the fatigue properties.

Management systems integration: survey results

2017 ◽  
Vol 34 (8) ◽  
pp. 1252-1294 ◽  
Author(s):  
Pedro Domingues ◽  
Paulo Sampaio ◽  
Pedro M. Arezes
Keyword(s):  
Design Methodology ◽  
Implementation Process ◽  
Integrated System ◽  
Iso 14001 ◽  
Management Systems ◽  
Content Type ◽  
Survey Results ◽  
The Common ◽  
Effective Integration

Purpose The purpose of this paper is to report the results from a survey carried out among Portuguese companies with their management systems (MSs) certified according to, at least two of the following standards: ISO 9001, ISO 14001 and OHSAS 18001. In addition, the results from a second survey conducted amid a group of experts that pointed out several aspects that impact on the integration level will be dissected. Design/methodology/approach The phenomenon of MSs integration is hardly transferable to a contained environment so some of the common research methods traditionally adopted include case studies, surveys, interviews and observation in situ. The findings from two surveys online among Portuguese companies and Portuguese experts are reported in the current paper. Findings The results suggest that a set of common characteristics is present on the majority of the surveyed companies. On first hand, there is evidence of an effective integration of the policies and the existence of an integrated system manager on the organizational structure of the companies. On the other hand, results suggest that training was provided to top management concerning integration issues, an integrating concept was taken into account during the implementation process and tools, and methods and objectives of the subsystems are aligned. Research limitations/implications This paper addresses the issues raised in the mainstream scientific bibliography through the collection of information amidst Portuguese companies. At this stage, it is not possible to infer at which extent the conclusions may be transferable to other geographic contexts. The small number of companies that completed the survey precludes the statistical generalization of the findings but the analytical generalization is not impaired. Originality/value The authors believe that the conclusions of this paper may aid both practioneers and scholars in the understanding of a complex but manageable organizational phenomenon. In addition, through the contents of this paper companies may collect information regarding the pertinent issues to address when developing their IMSs.

scholarly journals COVID-19’s impact on the hospitality workforce – new crisis or amplification of the norm?

2020 ◽  
Vol 32 (9) ◽  
pp. 2813-2829 ◽  
Author(s):  
Tom Baum ◽  
Shelagh K.K. Mooney ◽  
Richard N.S. Robinson ◽  
David Solnet
Keyword(s):  
Global Economy ◽  
Design Methodology ◽  
Policy Makers ◽  
Content Type ◽  
Global Policy ◽  
Key Stakeholders ◽  
Hospitality Workers ◽  
Fluid Environment ◽  
Practical Implications

Purpose The purpose of this paper is to highlight the immediate impacts of the COVID-19 pandemic on the hospitality workforce in situ between mid-April and June 2020. Design/methodology/approach This is a viewpoint paper that brings together a variety of sources and intelligence relating the impacts on hospitality work of the COVID-19 pandemic at three levels: macro (global, policy, government), meso (organisational) and micro (employee). It questions whether the situations faced by hospitality workers as a result of the pandemic are seed-change different from the precarious lives they normally lead or just a (loud) amplification of the “normal”. Findings In light of the fluid environment relating to COVID-19, conclusions are tentative and question whether hospitality stakeholders, particularly consumers, governments and the industry itself, will emerge from the pandemic with changed attitudes to hospitality work and hospitality workers. Practical implications This raises questions about hospitality work for key stakeholders to address in the future, some of which are systemic in terms of how precarious labour forces, critical to the global economy are to be considered by policy makers, organisations in a re-emerging competitive market for talent and for those who chose (or not) to work in hospitality. Social implications This paper contributes to ongoing debates about precarious work and the extent to which such practices are institutionalised and adopts an “amplification model” that may have value in futures-orientated analysis about hospitality and tourism. Originality/value This paper is wholly original and a reflection on the COVID-19 crisis. It provides a point of wider reference with regard to responses to crises and their impact on employment in hospitality, highlighting how ongoing change, fluidity and uncertainty serve to magnify and exacerbate the precarious nature of work in the industry.

Study of Abrasive Wear Mechanism through Nano Machining

2011 ◽  
Vol 462-463 ◽  
pp. 931-936 ◽  
Author(s):  
Sumaiya Islam ◽  
Raafat N. Ibrahim ◽  
Raj Das
Keyword(s):  
Abrasive Wear ◽  
Wear Mechanism ◽  
Bulk Material ◽  
Elastic Recovery ◽  
In Situ Observation ◽  
Nano Scale ◽  
Nickel Coatings ◽  
Machining Operations ◽  
Tip Radius

The objective of this paper is to understand the abrasive wear mechanism for producing a nano scale groove on a bulk material through nano machining. A nano indenter equipped with a nano scratching attachment was used for nano machining operation and in situ observation of the machined surfaces. Two different tools (Berkovich and Conical) with the same tip radius (100nm) but different edge geometries were used to machine both Copper and Nickel coatings. It was found that the percentage of elastic recovery was lower for Cu than Ni during this nano machining operations. Hence, the deformation mechanism in nano machining operation was identified as elasto-plastic in nature as opposed to the well established completely plastic mode of conventional machining operations. The pile up volume due to plastic deformation was utilized to distinguish between the ploughing and cutting modes of abrasive wear mechanisms. The results reveal that the ploughing mechanism was dominant for Cu and the cutting mechanism was dominant for Ni machining. Moreover, both mechanisms ploughing and cutting were the dominant modes of abrasive wear using the Berkovich tip compared to the Conical tip for producing a nano scale groove through nano machining.

Leaders should be first among equals

2010 ◽  
Vol 24 (5) ◽  
pp. 29-32
Keyword(s):  
Leadership Development ◽  
Case Studies ◽  
Design Methodology ◽  
Reading Time ◽  
Social Impact ◽  
Content Type ◽  
Fertile Ground ◽  
Pertinent Information ◽  
Practical Implications

PurposeReviews the latest management developments across the globe and pinpoints practical implications from cutting‐edge research and case studies.Design/methodology/approachThis briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context.FindingsAnyone who has been an employee for many years, and has worked for several different companies during that time, will know that it's extremely difficult to make sweeping statements about bosses. In a few cases they might have got there through ambition as much as talent, although a judicious combination of the two is more likely, and they are not always people with whom you would want to spend an evening in a bar. But once in situ, leaders' approaches to their role differ too much to make generalizations possible. This all provides fertile ground for experts examining leadership development.Practical implicationsProvides strategic insights and practical thinking that have influenced some of the world's leading organizations.Social implicationsProvides strategic insights and practical thinking that can have a broader social impact.Originality/valueThe briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy‐to‐digest format.

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