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1 – 10 of 486Cédric Decrocq, Bastien Martinez, Marie Albisser, Simona Dobre, Patrick Gnemmi, Yannick Bailly and Jean-Claude Roy
The present paper deals with weapon aerodynamics and aims to describe preliminary studies that were conducted for developing the next generation of long-range guided ammunition…
Abstract
Purpose
The present paper deals with weapon aerodynamics and aims to describe preliminary studies that were conducted for developing the next generation of long-range guided ammunition. Over history, ballistic research scientists were constantly investigating new artillery systems capable of overcoming limitations of range, accuracy and manoeuvrability. While futuristic technologies are increasingly under development, numerous issues concerning current powdered systems still need to be addressed. In this context, the present work deals with the design and the optimization of a new concept of long-range projectile with regard to multidisciplinary fields, including flight scenario, steering strategy, mechanical actuators or size of payload.
Design/methodology/approach
Investigations are conducted for configurations that combine existing full calibre 155 mm guided artillery shell with a set of lifting surfaces. As the capability of the ammunition highly depends on lifting surfaces in terms of number, shape or position, a parametric study has to be conducted for determining the best aerodynamic architecture. To speed-up this process, initial estimations are conducted thanks to low computational cost methods suitable for preliminary design requirements, in terms of time, accuracy and flexibility. The WASP code (Wing-Aerodynamic-eStimation-for-Projectiles) has been developed for rapidly predicting aerodynamic coefficients (static and dynamic) of a set of lifting surfaces fitted on a projectile fuselage, as a function of geometry and flight conditions, up to transonic velocities.
Findings
In the present study, WASP predictions at Mach 0.7 of both normal force and pitching moment coefficients are assessed for two configurations.
Originality/value
Analysis is conducted by gathering results from WASP, computational-fluid-dynamics (CFD) simulations, wind-tunnel experiments and free-flight tests. Obtained results demonstrate the ability of WASP code to be used for preliminary design steps.
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AS a result of an extensive development programme, carried out with the co‐operation of the U.S. Navy Bureau of Aeronautics, and the U.S. Army Air Corps, The Pratt & Whitney…
Abstract
AS a result of an extensive development programme, carried out with the co‐operation of the U.S. Navy Bureau of Aeronautics, and the U.S. Army Air Corps, The Pratt & Whitney Aircraft Company, of Hartford, Connecticut, has recently completed official tests on two sizes of fourteen‐cylinder, two‐row, geared and supercharged air‐cooled engines, the Twin Wasp Junior and the Twin Wasp.
Nilisha Itankar, Yogesh Patil, Prakash Rao and Viraja Bhat
Heavy metals play a crucial role in the economic development of any nation. Industries utilizing heavy metals, consequently, emanate a large volume of metal-containing liquid…
Abstract
Heavy metals play a crucial role in the economic development of any nation. Industries utilizing heavy metals, consequently, emanate a large volume of metal-containing liquid effluents. Since metals are non-renewable and finite resources, their judicious and sustainable use is the key. Hazardous metal-laden water poses threat to human health and ecology. Apart from metals, these industrial effluents also consist of toxic chemicals. Conventional physical–chemical techniques are not efficient enough as it consumes energy and are, therefore, not cost effective.
It is known that biomaterials namely microorganisms, plants, and agricultural biomass have the competence to bind metals, in some cases, selectively, from aqueous medium. This phenomenon is termed as “metal biosorption.” Biosorption has immense potential of becoming an effective alternative over conventional methods. The authors in the present chapter have used secondary data from their previous research work and attempted to develop few strategic models through their feasibility studies for metal sustainability.
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Since the outbreak of war, a number of enemy aircraft have fallen into German hands, either shot down, forced to land, or captured in occupied territory. Thus, in addition to the…
Abstract
Since the outbreak of war, a number of enemy aircraft have fallen into German hands, either shot down, forced to land, or captured in occupied territory. Thus, in addition to the aircraft, their armament and equipment, various types of engines of the enemy Powers—English, French and American — have become available for examination. Research on the materials has been carried out on behalf of the Reich Air Ministry by various German engine builders, and makers of components, and by the D.V.L.—the German Aeronautical Research Institute. The present report summarizes the principal results of this research; in view of the magnitude of the collected material, only the more important features of the engines will be dealt with.
Psychology, both as science and practice, has been largely developed in one cultural area of the world: Europe and North America. As a result, the discipline is culture-bound…
Abstract
Purpose
Psychology, both as science and practice, has been largely developed in one cultural area of the world: Europe and North America. As a result, the discipline is culture-bound, limited in its origins, concepts, and empirical findings to only this small portion of the world. The discipline is also culture-blind, largely ignoring the influence of the role of culture in shaping the development and display of human behaviour. These limitations have resulted in the dominant position of a Western Academic Scientific Psychology (WASP) in relation to other cultural perspectives on human behaviour. The paper aims to discuss these issues.
Design/methodology/approach
This paper draws on concepts and strategies in psychology (particularly cross-cultural and intercultural psychology) to propose some remedies to problems arising from the dominant WASP position. For example, of what relevance is such a limited perspective to understanding human activity in other cultures; and how can such a limited understanding serve the purpose of effective intercultural interactions?
Findings
The eventual goal is to achieve a global psychology that incorporates concepts and findings from societies and cultures from all parts of the world, one that will permit a valid understanding of people within their cultures, and permit effective intercultural across cultures.
Originality/value
The paper presents some criticisms of the dominant western psychology (WASP), and proposes that the achievement of a more global psychology may be within reach if some concepts and methods now available in psychology from both the dominant western sources and from those working in the rest of the world are used.
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There have always been traditional differences between the various regions of the British Isles. For example, meat consumption is greater in the North than the South; most…
Abstract
There have always been traditional differences between the various regions of the British Isles. For example, meat consumption is greater in the North than the South; most families take some meat at every meal and this extends to the children. The North is the home of the savoury meat products, eg., faggots, rissoles and similar preparations and a high meat content for such foods as sausages is expected; between 80 and 90% with the cereal only present for binding purposes. Present minimum meat contents would be considered a swindle, also the nature of the lean meat and the lean meat/fat ratio. The high water content similarly would have been unacceptable.
THE Pratt & Whitney Co. has recently brought out a new engine—the Series H. Wasp. It embodies the principal features of previous engines of this type, but also incorporates…
Abstract
THE Pratt & Whitney Co. has recently brought out a new engine—the Series H. Wasp. It embodies the principal features of previous engines of this type, but also incorporates certain new ideas. One of the most important novelties introduced is automatic valve lubrication.
The aim of this paper is to analyze the wind regime at Wainiyaku, Taveuni in Fiji, estimate Annual Energy Production (AEP) using a 275 kW Vergnet wind, and determine its economic…
Abstract
Purpose
The aim of this paper is to analyze the wind regime at Wainiyaku, Taveuni in Fiji, estimate Annual Energy Production (AEP) using a 275 kW Vergnet wind, and determine its economic viability.
Design/methodology/approach
The only grid supply is in the northeast (suburban area) of the island. The main source is diesel generators, which are operated only certain hours per day. The study around Wainiyaku state was essential to determine an alternative continuous source of energy. The wind assessment on the island was based on the data provided by the Department of Energy (Fiji) and WAsP was used to reliably estimate the wind power potential on the island.
Findings
The report suggested that Wainiyaku Taveuni is a good site for wind power generation based on mean wind speed at 30 m agl. The software predicted a resource grid for mean wind speed and power density around Wainiyaku. An economic analysis for a prospective wind power generation using Vergnet 275 kW showed a reasonable promise.
Research limitations/implications
The conclusion justifies that a longer period (3y) data are necessary for better accuracy. However, one‐year data are sufficient to predict annual energy production with reasonable certainty.
Originality/value
The paper provides an alternative solution for a continuous supply of electricity for a remote island. It shows the economics of utilizing wind power generator to provide unobstructed supply of electricity. It further explores the saving in foreign exchange for a small Island economy. The analysis of wind regime suggests that an independent power producer may consider investing in a wind farm at Wainiyaku.
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The emergence of Barack Obama as the President of the United States is analyzed in the context of theories of racial and ethnic relations. While it is true that social science…
Abstract
The emergence of Barack Obama as the President of the United States is analyzed in the context of theories of racial and ethnic relations. While it is true that social science theory did not predict this event, it is also true that the President's election must be seen in a historical context that has seen only one nonwhite Anglo-Saxon Protestant elected to the highest office in the land. Put differently, the chapter addresses why is it that other white groups have not occupied the highest office in the land? The chapter introduces the concept of “segregated diversity” to capture the crisis of theorizing in race and ethnic relations. Harold Cruse's ideas are utilized to bring some degree of order and understanding of the present issues of America and the realities of segregated diversity.
Defined as perceiving the past via the lens of former peoples, historical empathy engenders rich cognitive and affective understandings. Drawing on Ricoeur's hermeneutics (1981…
Abstract
Purpose
Defined as perceiving the past via the lens of former peoples, historical empathy engenders rich cognitive and affective understandings. Drawing on Ricoeur's hermeneutics (1981, 2004), this paper departs from previous work on historical empathy by conceiving empathy as dialogically mediated by sociocultural and narrative perceptions.
Design/methodology/approach
This hermeneutic phenomenology explores eight adolescents' engagements with primary sources from the Second World War.
Findings
This study reveals the power of empathy to draw the students into the past and to investigate sources. Alternately, the students struggled with fanciful elaborations and overidentifications with historical figures.
Practical implications
Cultivating wise judgments begins with accepting the inherent link between students' historicity and historical empathy and then teaching students to wisely interpret.
Originality/value
This study broadens historical empathy's framework to include Ricoeur's hermeneutic philosophies of narrative and history.
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