Abstract
Details
Keywords
Nour Mani, Nhiem Tran, Alan Jones, Azadeh Mirabedini, Shadi Houshyar and Kate Fox
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…
Abstract
Purpose
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.
Design/methodology/approach
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.
Findings
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.
Originality/value
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.
Graphical abstarct
Details
Keywords
The increasing economic importance of knowledge is redefining firm‐market boundaries, work arrangements and the links between education work and learning. This article proposes a…
Abstract
The increasing economic importance of knowledge is redefining firm‐market boundaries, work arrangements and the links between education work and learning. This article proposes a new framework: the knowledge supply model, which helps individuals, firms and learning institutions understand the dynamics of change and emerging patterns of knowledge demand and supply in different sectors of the economy. It also assists learning institutions to tailor their products and services to the needs of knowledge consumers. As working and learning become synonymous, firms, workers, educators and intermediaries will have to adopt new roles and develop new strategies. Understanding the dynamics of knowledge demand and supply should assist all actors in navigating knowledge markets of the new economy.
Details
Keywords
Alan Jones, Grahame Fallon and Roman Golov
Explores the obstacles facing trans‐national corporations (TNC) considering FDI in Russia. Dunning (1994) suggests that countries’ abilities to attract and exploit the potential…
Abstract
Explores the obstacles facing trans‐national corporations (TNC) considering FDI in Russia. Dunning (1994) suggests that countries’ abilities to attract and exploit the potential economic benefits of inbound FDI vary according to their national political, economic and legal cultures, traditions and infrastructures, together with the economic objectives and policies pursued by host governments. This paper seeks to make use of Dunning’s model, in exploring the obstacles to FDI in modern Russia, and their implications for TNCs. The papers’ findings suggest that Russia’s relative lack of success in attracting FDI and exploiting its potential benefits during the 1990s can be attributed to her national infrastructural factors and government policies, as Dunning’s model suggests. Russia’s ability to attract a larger share of FDI in future seems likely to be constrained by national ambivalence towards the benefits of FDI, together with the political and economic realities of her current situation.
Details
Keywords
Liang Yang, Andrew Buchan, Dimitrios Pavlidis, Alan Jones, Paul Smith, Mikio Sakai and Christopher Pain
This paper aims to propose a three-phase interpenetrating continua model for the numerical simulation of water waves and porous structure interaction.
Abstract
Purpose
This paper aims to propose a three-phase interpenetrating continua model for the numerical simulation of water waves and porous structure interaction.
Design/methodology/approach
In contrast with one-fluid formulation or multi-component methods, each phase has its own characteristics, density, velocity, etc., and each point is occupied by all phases. First, the porous structure is modelled as a phase of continua with a penalty force adding on the momentum equation, so the conservation of mass is guaranteed without source terms. Second, the adaptive unstructured mesh modelling with P1DG-P1 elements is used here to decrease the total number of degree of freedom maintaining the same order of accuracy.
Findings
Several benchmark problems are used to validate the model, which includes the Darcy flow, classical collapse of water column and water column with a porous structure. The interpenetrating continua model is a suitable approach for water wave and porous structure interaction problem.
Originality/value
The interpenetrating continua model is first applied for the water wave and porous structure interaction problem. First, the structure is modelled as phase of non-viscous fluid with penalty force, so the break of the porous structure, porosity changes can be easily embedded for further complex studies. Second, the mass conservation of fluids is automatically satisfied without special treatment. Finally, adaptive anisotropic mesh in space is employed to reduce the computational cost.
Details
Keywords
Abstract
Details
Keywords
Catherine Woodward, Alan Jones and Tasim Martin
It is recognised that training is required for staff working with people with a diagnosis of personality disorder, as it poses challenges requiring particular skills and abilities…
Abstract
It is recognised that training is required for staff working with people with a diagnosis of personality disorder, as it poses challenges requiring particular skills and abilities (National Institute for Mental Health in England, 2003a). The proposal to train graduate primary care mental health workers (GPCMHWs) to work with the client group met with some scepticism by senior clinicians. However, the experience of providing training and supervision to the graduate primary care mental health workers to work with clients with personality disorder in Camden and Islington has proved positive. Several characteristics of the GPCMHWs identified in the training literature might contribute to this positive experience. Those factors include cognitive ability, motivation to learn, age, and attitudes. Initial findings from the evaluation of the training shows that graduate workers respond positively to the training, showing improvements in self‐rated knowledge and skills relating to working with the client group, and an eagerness to learn more. The relevance of this to the personality disorder capabilities framework are described.
Details
Keywords
With continuous learning being so essential to corporate wellbeingin the future, the learning organization concept is seriously takingroot. Examines how learning organizations are…
Abstract
With continuous learning being so essential to corporate wellbeing in the future, the learning organization concept is seriously taking root. Examines how learning organizations are created.
Details
Keywords
In the next millennium there will be more large firms in the hospitality industry, and these large firms will get larger. But despite the fact that we have had such chains for…
Abstract
In the next millennium there will be more large firms in the hospitality industry, and these large firms will get larger. But despite the fact that we have had such chains for nearly 50 years, we know remarkably little about the operational management of chains. This article considers the importance of chain operations and reviews alternative theoretical perspectives on how such chains should be managed. It proposes a new model of multi‐unit management based around six key activities – integration, location, configuration, organisation, implementation and adaptation.