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Internet user privacy risks have been a topical subject with respect to consumers, corporations and governments. In line with the recent privacy scandals linked to social media, the aim of this study is to explore users’ privacy protection behaviors (PPB) on Facebook through the actions they take to protect their privacy, their underlying motives and the values behind these protective actions. Moreover, this study aims to address an unintended consequence of Facebook usage. Despite Facebook’s positive and uplifting goal of connecting people, consumers are forced to resort to specific behaviors to protect their privacy and well-being.

This study adopts an exploratory research approach by using a well-established qualitative technique: structured laddering interviews. In total, 20 in-depth personal interviews were conducted with the Millennials.

Results show that the process of privacy protection is initiated by experiences, uncertainty and literacy, rather than threats, which leads to concerns that trigger PPBs. The most common PPBs include: “Reflection,” “Avoidance,” “Intervention,” “Restriction,” “Control,” and “Restraint.” The underlying motives for the adoption of these strategies include: “Success,” “Security,” “Social Recognition,” “A World of Peace,” “Exclusivity of Self,” “Being in Control,” “Meaning” and “True Friendship”.

The present research adopts a transdisciplinary framework to help fill the gap regarding the interplay of PPBs on Facebook, the triggers of those behaviors and their underlying motives. It contributes to the service literature and practice as it provides insights into a growing area of interest, whereas more social media channels are being created and more services are using social media strategies to engage and interact with their customers. Finally, it addresses the growing need to consider the impact of technological services, including internet and social media, on consumers’ and societies’ well-being.

The study aims to propose a comprehensive overview of the Omnichannel phenomenon by identifying its theoretical foundations as well as future research directions.

In order to systematize Omnichannel-centered contributions and identify future research directions for post-Covid-19, this study adopted a mixed-method study, combining a systematic literature review, a bibliometric co-citation analysis and a panel discussion by field experts.

In Study 1, the authors traced extant literature on Omnichannel back to its theoretical foundations, which led to the identification of four research areas in which the concept of Omnichannel is rooted. Contributions pertaining to the aforesaid research areas were discussed and submitted to a panel of experts (Study 2) after the lockdown periods. The experts gave various insights into both the past and future of Omnichannel research. Finally, a framework synthesizing theoretical foundations of Omnichannel, literature gaps and opportunities for future research is provided.

To our knowledge, this is the first attempt to combine mixed methods study in Omnichannel research and to involve a panel of experts in order to discuss the findings of a literature review and evaluate future research directions. This choice allowed us to investigate both incumbent academic and managerial challenges raised by Omnichannel and to provide guidance for the post-pandemic recovery.

This paper aims to investigate the wear behaviour of different materials for cylinder liners and piston rings in a linear reciprocating tribometer with special focus on the wear of the cylinder liner in the boundary lubrication regime.

Conventional nitrided steel, as well as diamond-like carbon and chromium nitride-coated piston rings, were tested against cast iron, AlSi and Fe-coated AlSi cylinder liners. The experiments were carried out with samples produced from original engine parts to have the original surface topography available. Radioactive tracer isotopes were used to measure cylinder liner wear continuously, enabling separation of running-in and steady-state wear.

A ranking of the material pairings with respect to wear behaviour of the cylinder liner was found. Post-test inspection of the cylinder samples by scanning electron microscopy (SEM) revealed differences in the wear mechanisms for the different material combinations. The results show that the running-in and steady-state wear of the liners can be reduced by choosing the appropriate material for the piston ring.

The use of original engine parts in a closely controlled tribometer environment under realistic loading conditions, in conjunction with continuous and highly sensitive wear measurement methods and a detailed SEM analysis of the wear mechanisms, forms an intermediate step between engine testing and laboratory environment testing.