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1 – 10 of over 1000Mohammed Rajik Khan and Atul Sonawane
This paper aims to present 3D finite element (FE) simulations of impact loading on a construction safety helmet over a headform to improve the ventilation slots profile in helmet…
Abstract
Purpose
This paper aims to present 3D finite element (FE) simulations of impact loading on a construction safety helmet over a headform to improve the ventilation slots profile in helmet design.
Design/methodology/approach
Impact response on headforms in three different studies considering ventilation slots of varied profiles and dimensions in helmets with rectangular elliptical and circular slots is compared and analysed. Head injury criteria (HIC) and safety regulations from past literature have been considered to evaluate the impact responses.
Findings
Simulation results show that a helmet with rectangular ventilation slots achieves a lowest peak impact force of 5941.3 N for a slot area of 170 mm2 as compared to elliptical and circular slots.
Research limitations/implications
Ventilation slots of simple geometry (rectangular, elliptical and circular) have been considered in this work. Other/complex geometry slots can also be chosen to predict its effect during impact response on a helmet–headform model. Biofidelic head–neck FE model can be developed to achieve precise results.
Practical implications
The presented work gives a clear idea to design engineers for the selection of ventilation slot profiles to design a construction safety helmet.
Social implications
Construction safety (CS) helmets are used to reduce injuries on heads of workers at construction sites in the event of free-falling objects. Rectangular ventilation slots in CS helmets as suggested in the work may reduce the risk of injury.
Originality/value
Results are found in good agreement with the past numerical simulation of impact response on a construction safety helmet over a validated biofidelic head FE model.
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M. Grujicic, A. Arakere, B. Pandurangan, A. Grujicic, A. Littlestone and R. Barsoum
Polyurea falls into a category of elastomeric co‐polymers in which, due to the presence of strong hydrogen bonding, the microstructure is of a heterogeneous nature and consists of…
Abstract
Purpose
Polyurea falls into a category of elastomeric co‐polymers in which, due to the presence of strong hydrogen bonding, the microstructure is of a heterogeneous nature and consists of a compliant/soft matrix and stiff/hard nanometer size hard domains. Recent investigations have shown that the use of polyurea as an external or internal coating/lining had substantially improved ballistic‐penetration resistance of metallic structures. The present work aims to use computational methods and tools in order to assess the shock‐mitigation ability of polyurea when used in the construction of different components (suspension‐pads, internal lining and external coating) of a combat helmet.
Design/methodology/approach
Shock‐mitigation capability of combat helmets has become an important functional requirement as shock‐ingress into the intra‐cranial cavity is known to be one of the main causes of traumatic brain injury (TBI). To assess the shock mitigation capability of polyurea, a combined Eulerian/Lagrangian fluid/solid transient non‐linear dynamics computational analysis of an air/helmet/head core sample is carried out and the temporal evolution of the axial stress and particle velocities (for different polyurea augmented helmet designs) are monitored.
Findings
The results obtained show that improvements in the shock‐mitigation performance of the helmet are obtained only in the case when polyurea is used as a helmet internal lining and that these improvements are relatively small. In addition, polyurea is found to slightly outperform conventional helmet foam, but only under relatively strong (greater than five atm) blastwave peak overpressures.
Originality/value
The present approach studies the effect of internal linings and external coatings on combat helmet blast mitigation performance.
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Gives a bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the…
Abstract
Gives a bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the theoretical as well as practical points of view. The range of applications of FEMs in this area is wide and cannot be presented in a single paper; therefore aims to give the reader an encyclopaedic view on the subject. The bibliography at the end of the paper contains 2,025 references to papers, conference proceedings and theses/dissertations dealing with the analysis of beams, columns, rods, bars, cables, discs, blades, shafts, membranes, plates and shells that were published in 1992‐1995.
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David Stark (opposite) is one of a trio who got together and, in a textbook ‘shell’ operation, turned a sleepy commodity dealing company—JH Vavasseur—into a thrusting organization…
Abstract
David Stark (opposite) is one of a trio who got together and, in a textbook ‘shell’ operation, turned a sleepy commodity dealing company—JH Vavasseur—into a thrusting organization with a current market capitalisation of £20 million.
To discuss organizations’ approaches to company values and ethics, an important aspect of which should be finding out from employees what their perceptions are – asking them “What…
Abstract
Purpose
To discuss organizations’ approaches to company values and ethics, an important aspect of which should be finding out from employees what their perceptions are – asking them “What do we stand for?”
Design/methodology/approach
This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context.
Findings
If you are a big company like Shell, getting front‐page news and mentions on prime‐time TV for all the wrong reasons, it's understandable why you make massive efforts to give priority to ethical strategies and to make sure they're well understood and accepted both externally and internally. The fact that Shell was already working on the studies and actions which crystallized into its present stakeholder approach to management well before it was rocked by the Ken Saro‐Wiwa and Brent Spar controversies did nothing to lessen the negative impact, but few would doubt that the vociferous criticism hurried the process along.
Originality/value
The experiences noted in the articles provide a basis of discussion for organizations to decide the values, ethics and principles that they will adhere to as they go about their business.
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To examine how art is shaped by war, outside of the official commemorative projects of the First World War. The purpose of this paper is to examine the experience of a…
Abstract
Purpose
To examine how art is shaped by war, outside of the official commemorative projects of the First World War. The purpose of this paper is to examine the experience of a surgeon/artist who knew first-hand the horror of industrial scale of destruction. It speculates on how his medical education and surgical knowledge in the treatment of the casualties informed his art and considers how such scientific discourses may have contributed to a new modernist language.
Design/methodology/approach
The double career of J.W. Power – a surgeon then an artist – provides a case study to probe such questions. The paper speculates about the connections between these different careers, and considers the implications of becoming an artist for someone who had pre-war university-training, medical expertise and experience as a war surgeon. In particular, consideration is given to how surgical knowledge and contemporary medical debates may have informed a group of later paintings.
Findings
A group of J.W. Power’s late paintings stand apart from his other subjects as they suggest states of physical or psychological damage. Indeed by the 1930s shell shock was recognised as a war-related psychological injury. These paintings then may not only be an act of remembrance, but also potentially a reflection on that new discourse.
Research limitations/implications
It remains a compelling idea that by the 1930s Power had found a modern abstract language capable of revisiting the traumatic subject of his hospital sketches. The implications of the war-time surgery on his art was delayed and remains highly ambiguous, however it invites, indeed encourages, such speculation.
Originality/value
The paper is the first to examine the cultural impact of the medical career of the artist J.W. Power. His medical training and experience as a war-time surgeon is shown to have been significant to his later painting, for he knew the regenerative powers of modern surgery, of how such knowledge had the power to repair and to heal.
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David Crowther and Esther Ortiz Martinez
Agency Theory is normally used to explain the relationship between the managers of a corporation and its owners, or shareholders, and to legitimate the payment of share options…
Abstract
Purpose
Agency Theory is normally used to explain the relationship between the managers of a corporation and its owners, or shareholders, and to legitimate the payment of share options, and other remuneration mechanisms, to those managers on the basis that this will align the interests of the managers of a corporation with those of its owners. The paper aims to argue that this outworn legitimation is not just based on a bankrupt theory but is actually deleterious to corporate performance, managerial behaviour and the relationship between managers, shareholders and other stakeholders.
Design/methodology/approach
The approach is to examine the behaviour of the managers of The Royal Dutch/Shell Group of Companies (“Shell”) as they have continued to reinterpret accounting regulations, reclassify oil reserves and re‐report past and probable/possible future performance of the company.
Findings
The argument is predicated in the assertion that in the relationship between owners and managers of such a corporation there are actually no principals and therefore there can be no agents. Furthermore, the rewards structure developed from the theory provides a motivation for managerial misrepresentation leading to a situation in which principles are defunct. The Social Contract between all stakeholders to a corporation has been reinvigorated as a basis for sustainable performance, with consequent implications for the behaviour of all parties to the contract.
Originality/value
The paper illustrates that evidence abounds showing that corporations do not have any sense of social responsibility and do not feel constrained by any kind of ethical code, no matter what their corporate literature states, but that there are an increasing number of stakeholders to organisations who are demanding accountability – and forcing corporations to respond accordingly.
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Sarah George Lauwo, Osamuyimen Egbon, Mercy Denedo and Amanze Rajesh Ejiogu
This paper explores the historical roots of environmental accountability in the Niger Delta region of Nigeria by focusing on the campaigns for social and environmental justice by…
Abstract
Purpose
This paper explores the historical roots of environmental accountability in the Niger Delta region of Nigeria by focusing on the campaigns for social and environmental justice by writer Ken Saro-Wiwa and the indigenous Ogoni people.
Design/methodology/approach
The methods consist of an analysis of books, diaries, letters and poems written by Ken Saro-Wiwa as well as books, reports and audio recordings of panel discussions which capture the Ogoni struggle, Ken Saro-Wiwa’s activism and its impacts. The authors’ approach to the data is sensitised by Foucault’s notion of counter-conduct as it enables the authors to better grasp the creative agency of Saro-Wiwa and the Ogoni as they struggle and campaign for political autonomy, environmental justice and accountability.
Findings
The authors’ findings illustrate how Ken Saro-Wiwa’s books, letters, poems, diaries and articles provide early accounts of environmental injustices and the absence of accountability in the Niger Delta. They highlight how Saro-Wiwa and the Ogoni movement deploy counter-conduct to subvert existing power and accountability structures through innovative strategies, effective mobilisation and communication at local and international levels. The authors’ findings also highlight how these have led to specific forms of accountability for human rights and the environment at local and global levels. They also show how Saro-Wiwa’s activism and the Ogoni struggle have inspired a new generation of environmental activists and new ways of demanding accountability.
Originality/value
This paper presents, for the first time, an account of the historical roots of environmental accountability practices from an African and developing country context. Its focus on the historical roots of environmental accountability is also unique as it expands the view beyond the origins of environmental accounting to look more broadly at the origins of environmental accountability practices.
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To apply the theories of project management to the transformation of the British Expeditionary Force (BEF) from the colonial‐style army of 1914 into the victorious…
Abstract
Purpose
To apply the theories of project management to the transformation of the British Expeditionary Force (BEF) from the colonial‐style army of 1914 into the victorious continental‐style armies of 1918.
Design/methodology/approach
The methodological approach examines ten elements in the transformation. They range from the resources required to the necessary governmental changes. Emphasis is given to analysing the application of the new technologies, the political and social changes needed for eventual success, and the learning achieved.
Findings
Transforming the BEF was not to be an easy process. Obviously, the German nation, allies and armies did all they could to thwart this transformation. The “total war” waged is the ultimate form of “competition”. Thus, difficult lessons of strategic management, people (both men and women) management, and resources utilisation had to be learned. Through the many innovations, the experience curve was climbed to achieve mastery over the German field army.
Originality/value
To turn the BEF from a force of 120,000 at the battle of Mons to nearly 2 million at the Armistice on the western front was a remarkable achievement. Despite the strains imposed by German military prowess, the many elements were combined successfully. Although applying warfare principles to company management has become popular in the past decade, this paper avoids coming to simplistic conclusions. Rather it presents the transformation as a case study and suggests linkages to modern project management practices though leaving it to the reader to consider how these might be best applied.
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Reviews the latest management developments across the globe and pinpoints practical implications from cutting‐edge research and case studies.
Abstract
Purpose
Reviews the latest management developments across the globe and pinpoints practical implications from cutting‐edge research and case studies.
Design/methodology/approach
This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context.
Findings
In 2001, influential British periodical Management Today announced that Shell Transport and Trading was Britain's “most admired” company following a consultative survey of 240 chief executives. The praise for Shell and its new chairman Philip Watts was glowing and unqualified. In 2004, following an announcement that Shell's “proven” oil and gas reserves would need to be reduced by 20 percent, the company was hit in quick succession by the following blows: in the UK the Securities and Exchange Commission launched an investigation; calls were made for Watts to resign, together with Walter van de Vijver, CEO of Shell Exploration and Production; and the US Department of Justice launched its own criminal investigation.
Practical implications
Provides strategic insights and practical thinking that have influenced some of the world's leading organizations.
Originality/value
The 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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