Nikolay K. Tolochko, Yurii V. Khlopkov, Sergei E. Mozzharov, Michail B. Ignatiev, Tahar Laoui and Victor I. Titov
The normal spectral absorptance of a number of metal, ceramic and polymer powders susceptible to be utilised for selective laser sintering (SLS) technique was experimentally…
Abstract
The normal spectral absorptance of a number of metal, ceramic and polymer powders susceptible to be utilised for selective laser sintering (SLS) technique was experimentally determined. The measurements were performed with two laser wavelengths of 1.06μm and 10.6μm obtained by using two lasers – Nd‐YAG and CO2 respectively. The change in the powder absorptance with time during laser processing was also investigated. The effect of the absorptance characteristics on the sintering process is discussed.
Details
Keywords
Nikolay K. Tolochko, Maxim K. Arshinov, Andrey V. Gusarov, Victor I. Titov, Tahar Laoui and Ludo Froyen
Coupled metallographic examination and heat transfer numerical simulation are applied to reveal the laser sintering mechanisms of Ti powder of 63‐315 μm particle diameter. A…
Abstract
Coupled metallographic examination and heat transfer numerical simulation are applied to reveal the laser sintering mechanisms of Ti powder of 63‐315 μm particle diameter. A Nd:YAG laser beam with a diameter of 2.7‐5.3 mm and a power of 10‐100 W is focused on a bed of loose Ti powder for 10 s in vacuum. The numerical simulation indicates that a nearly hemispherical temperature front propagates from the laser spot. In the region of α‐Ti just behind the front, heat transfer is governed by thermal radiation. The balling effect, formation of melt droplets, is not observed because the temperature increases gradually and the melt appears inside initially sintered powder which resists the surface tension of the melt.
Nikolay K. Tolochko, Sergei E. Mozzharov, Igor A. Yadroitsev, Tahar Laoui, Ludo Froyen, Victor I. Titov and Michail B. Ignatiev
A comparison of selective laser sintering (SLS) and selective laser cladding (SLC) methods is presented. Loose single‐component, Ni‐alloy powder was used in this study. The powder…
Abstract
A comparison of selective laser sintering (SLS) and selective laser cladding (SLC) methods is presented. Loose single‐component, Ni‐alloy powder was used in this study. The powder feeding system formed the flow of powder particles directed into the zone of laser spot. The particles were deposited directly onto a substrate or onto the top of a pedestal. The powders were treated with a CW‐ Nd:YAG laser (λ=1.06 μm). The beam was motionless relative to the powder bed. As a result, the samples of sintered or remelted powders were built up as the vertical rods. The geometrical characteristics, structure and mechanical properties of samples were investigated.
Details
Keywords
Nikolay K. Tolochko, Sergei E. Mozzharov, Igor A. Yadroitsev, Tahar Laoui, Ludo Froyen, Victor I. Titov and Michail B. Ignatiev
The particularities of the selective laser processing of single‐component metal powder layers were investigated, especially the occurrence of the balling‐processes under different…
Abstract
The particularities of the selective laser processing of single‐component metal powder layers were investigated, especially the occurrence of the balling‐processes under different processing conditions. During laser processing, sintered, semi‐sintered/semi‐melted or completely melted cakes can be formed. Size and shape of the laser processed parts can change depending on the energy and time parameters of the laser irradiation and on the properties of initial powder layers.
Details
Keywords
Andrey Shapenko and Sergey Martynov
The learning outcomes of this study are as follows: investigate a story of growth in a volatile emerging market environment; and discuss strategy development in a stagnating…
Abstract
Learning outcomes
The learning outcomes of this study are as follows: investigate a story of growth in a volatile emerging market environment; and discuss strategy development in a stagnating, highly competitive market.
Case overview/synopsis
In October 2017, Pavel Titov, the owner and Chairman of the Board of Directors of Abrau-Durso Group, assigned a large international consulting firm to assist him in the development of a new corporate strategy. It was 11 years since the Titov family had taken over the then-struggling iconic sparkling wine manufacturer. The Titovs invested heavily into the enterprise with the dream of reviving the century-old brand, and turned the company around: in 2017, Abrau-Durso was the No. 1 sparkling wine brand in the Russian market. However, the shareholders wanted the company to grow further and believed that it was possible to generate more value. How could the company continue growing and increase its value at a time when the wine market was stagnating and the Russian economy was going through a rough period?
Complexity academic level
Masters level (MBA, Executive MBA).
Supplementary materials
Teaching Notes are available for educators only.
Subject code
CSS: 11: Strategy.
Details
Keywords
To analyze and personally relate to an individual having faced a quarter-life crisis; to define how environmental factors influence the person’s career priorities; to analyze the…
Abstract
Learning outcomes
To analyze and personally relate to an individual having faced a quarter-life crisis; to define how environmental factors influence the person’s career priorities; to analyze the causes of career-family conflicts; to comprehend another gender’s position and concerns; and to originate ideas for prospective career development.
Case overview/synopsis
The case study presents a career management dilemma of a PhD candidate, senior lecturer at the Almaty Management University, Kazakhstan and a married mother of two small children. Having faced a kind of quarter-life crisis and the pressures of a traditional society with gendered career trajectories, the protagonist (33) is challenging her initial plan of an academic career that sees gradual promotion and progress and has to make a difficult decision about her professional and personal identity amidst the realities of a newly emerging and transitional economy.
Complexity academic level
Master’s level
Supplementary materials
Teaching notes, company’s organizational charts, protagonist’s curriculum vitae, PowerPoint slides with the protagonist and her classmates’ pictures.
Subject code
CSS 6: Human Resource Management.
Details
Keywords
Looks at the reasons for the collapse of both regimes and considers the importance of repression with these developments. Contrasts the methods of Imperial Russia with the…
Abstract
Looks at the reasons for the collapse of both regimes and considers the importance of repression with these developments. Contrasts the methods of Imperial Russia with the Bolsheviks looking at Court proceedings, prison conditions, education and propaganda in prison, exile and the secret police. Concludes that whilst social support is usually seen as essential for survival of a system, repression is not regarded as a positive element but can become the method for a system’s survival and stability.
Details
Keywords
Ernesto Tavoletti and Vas Taras
This study aims to offer a bibliometric analysis of the already substantial and growing literature on global virtual teams (GVTs).
Abstract
Purpose
This study aims to offer a bibliometric analysis of the already substantial and growing literature on global virtual teams (GVTs).
Design/methodology/approach
Using a systematic literature review approach, it identifies all articles in the Web of Science from 1999 to 2021 that include the term GVTs (in the title, the abstract or keywords) and finds 175 articles. The VOSviewer software was applied to analyze the bibliometric data.
Findings
The analysis revealed three dialogizing research clusters in the GVTs literature: a pioneering management information systems and organizational cluster, a general management cluster and a growing international management and behavioural studies cluster. Furthermore, it highlights the most cited articles, authors, journals and nations, and the network of strong and weak links regarding co-authorships and co-citations. Additionally, this study shows a change in research patterns regarding topics, journals and disciplinary approaches from 1999 to 2021. Finally, the analysis illustrates the position and centrality in the network of the most relevant actors.
Practical implications
The findings can guide management practitioners, educators and researchers to the most meaningful clusters of publications on GVTs, and help navigate and make sense of the vast body of the available literature. The importance of GVTs has been growing in the past two decades, and Covid-19 has accelerated the trend.
Originality/value
This study provides an updated and comprehensive systematic literature review on GVTs. To the best of the authors’ knowledge, it is also the first systematic literature review and bibliometry on GVTs. It concludes by suggesting future research paths.