Search results

The purpose of this study is therefore to detail an additive manufacturing process for printing TiD parts for implant applications. Titanium–diamond (TiD) is a new composite that provides biocompatible three-dimensional multimaterial structures. Thus, the authors report a powder-deposition and print optimization strategy to overcome the dual-functionality gap by printing bulk TiD parts. However, despite favorable customization outcomes, relatively few additive manufacturing (AM) feedstock powders offer the biocompatibility required for medical implant and device technologies.

AM offers a platform to fabricate customized patient-specific parts. Developing feedstock that can be 3D printed into specific 3D structures while providing a favorable interface with the human tissue remains a challenge. Using laser metal deposition, feedstock powder comprising diamond and titanium was co-printed into TiD parts for mechanical testing to determine optimal manufacturing parameters.

TiD parts were fabricated comprising 30% and 50% diamond. The composite powder had a Hausner ratio of 1.13 and 1.21 for 30% and 50% TiD, respectively. The flow analysis (Carney flow) for TiD 30% and 50% was 7.53 and 5.15 g/s. The authors report that the printing-specific conditions significantly affect the integrity of the printed part and thus provide the optimal manufacturing parameters for structural integrity as determined by micro-computed tomography, nanoindentation and biocompatibility of TiD parts. The hardness, ultimate tensile strength and yield strength for TiD are 4–6 GPa (depending on build position), 426 MPa and 375 MPa, respectively. Furthermore, the authors show that increasing diamond composition to 30% results in higher osteoblast viability and lower bacteria count than titanium.

In this study, the authors provide a clear strategy to manufacture TiD parts with high integrity, performance and biocompatibility, expanding the material feedstock library and paving the way to customized diamond implants. Diamond is showing strong potential as a biomedical material; however, upscale is limited by conventional techniques. By optimizing AM as the avenue to make complex shapes, the authors open up the possibility of patient-specific diamond implant solutions.

This paper aims to present a methodology for the detection and categorisation of metal powder particles that are partially attached to additively manufactured lattice structures. It proposes a software algorithm to process micro computed tomography (µCT) image data, thereby providing a systematic and formal basis for the design and certification of powder bed fusion lattice structures, as is required for the certification of medical implants.

This paper details the design and development of a software algorithm for the analysis of µCT image data. The algorithm was designed to allow statistical probability of results based on key independent variables. Three data sets with a single unique parameter were input through the algorithm to allow for characterisation and analysis of like data sets.

This paper demonstrates the application of the proposed algorithm with three data sets, presenting a detailed visual rendering derived from the input image data, with the partially attached particles highlighted. Histograms for various geometric attributes are output, and a continuous trend between the three different data sets is highlighted based on the single unique parameter.

This paper presents a novel methodology for non-destructive algorithmic detection and categorisation of partially attached metal powder particles, of which no formal methods exist. This material is available to download as a part of a provided GitHub repository.

This study contends that the various forms of archaic trade that anthropologists have reconstructed on the Northwest Coast of America are explanatory of plot-construction and characterization in Conrad's South-American novel. My thesis is that Nostromo is a figure defined by the practice of potlatch, and that his key presence in the plot entails the representation of a culturally dislocating transition from archaic transactions to modern commerce. The theoretical framework of this chapter hinges on the insights of Marcel Mauss, Claude Lévi-Strauss, Karl Polanyi, and Georges Bataille.

Styles of food journalism are defined by the audience that specific journals wish to attract. In the UK this has led to contrasting representations of food and catering in different forms of media, specifically those aimed at, on the one hand, catering professionals and on the other, amateurs who retain an interest in food. For “amateurs” interested in food, the images of catering work presented in magazines and other media targeted at them is understood to be “genuine”, while for those who work in the trade there is resentment at what are seen as sanitized images that are taken for “reality” by amateur audiences. This leads to a situation in the restaurant where differing views of the world of catering and the ownership of “expertise” about that world leads to conflict between patron and customer. Furthermore, this conflict is increasingly expressed by both groups, as a result of easier access to the media.

As Ratnam makes clear, a cultural–historical perspective on teacher/faculty excessive entitlement is indispensable if we are to use this concept to work with, rather than undermine, education practitioners. In this chapter, a networked relational model of activity is proposed as a tool for understanding excessive entitlement from a cultural–historical activity theory (CHAT) perspective, so that the transformative potential of both entitlement and the modeling of it may be harnessed. The networked relational model, which represents CHAT activity systems as a hand-draw or painted network of relationships between actors and artifacts, allows its creators, in their capacity as researchers or academics, to use it as an imaginative artifact in the Wartofskian sense. That is, by representing activity systems of academic performance as networks of interacting entities, the emergence of excessive entitlement can be traced to, and perhaps mitigated through the relationships that they represent. In this regard, the why, what, and how artifacts proposed by Engeström are taken up as useful means for enhancing the functioning of the networked relational model not just as a tool for analyses of entitlement but also a means for envisioning alternative countercultures into being.

I review the 2019 film Bombshell, directed by Jay Roach. The film presents a fictionalized account of Fox News CEO Roger Ailes’s sexual harassment of his employees. Bombshell’s focus on the experiences of three women illuminates that sexual harassment affects individuals but that collective action can combat it.

Current research provides an incomplete picture of the challenges facing human resource personnel (HRP) tasked with managing a workplace bullying complaint. The purpose of this paper is to provide a holistic model of the complaint management process in order to advance the theorising of HRP’s role in this important process, and the challenges they face in undertaking it.

Cases of workplace bullying heard before the legal system were analysed – a novel data source in research on workplace bullying. Thematic analysis was undertaken on the case determinations to identify the challenges HRP faced that prevented the resolution of the complaint.

The analysis indicated two key phases in the complaints management process with five associated challenges. The first two challenges were related to HRP’s ability to assess the substance of the complaint. HRP’s ability or inability to “sort out” conflicting accounts and to follow the process saw the complaint follow one of three “resolution pathways”. Three further challenges were associated with HRP communicating the outcome to the complainant. Failure to overcome these challenges left the complainant aggrieved at the unfairness in which their complaint had been handled – triggering legal action.

This paper draws on a novel data source to provide a holistic model of the complaint management process related to workplace bullying which details the various components and challenges related to HRP throughout the process. Alongside advancing theory, this research has practical value for improving HR practice.

The elaboration of framing in social movement theory offers a different perspective than is typically taken in social marketing. This paper explores how social marketing may benefit from this alternate lens.

The construction, features and processes associated with collective action frames in social movements are examined and explored via two social causes: obesity and disaster preparation.

A social movement perspective on framing highlights the need to better understand variations in how groups may perceive a problem and its solutions. It suggests a range of considerations and options in constructing and participating in the development of collective action frames, which are suggested to benefit social marketing initiatives and, thus, society.

Further research in societal well-being and the meso-level of social change should consider adopting a social movement framing perspective. A list of questions is provided to guide future research.

Mobilising a group into action is often a necessary and effective step in realising social change. The questions raised in social movement framing will equip practitioners and researchers with greater understanding of the issue, the context and potential solutions, ultimately to encourage positive social movements and social benefit.

While calls have been made for broader perspectives in social marketing, little attention has been given to social movements. This paper offers a way forward with respect to framing.