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Article
Publication date: 1 October 1935

The publication of the fourth edition of Care and Maintenance of Aircraft now includes a new chapter, entitled “Aeroplane Timbers,” by Mr. A. W. Seeley, which constitutes…

Abstract

The publication of the fourth edition of Care and Maintenance of Aircraft now includes a new chapter, entitled “Aeroplane Timbers,” by Mr. A. W. Seeley, which constitutes another valuable addition to the instructive information to aeronautical engineers, etc., that has been incorporated in this publication since its inception.

Details

Aircraft Engineering and Aerospace Technology, vol. 7 no. 10
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 December 1933

A.W. Seeley

ALTHOUGH the modern tendency in aeroplane construction is to produce an all‐metal machine, the time has not yet come when we can definitely say that this or that machine…

Abstract

ALTHOUGH the modern tendency in aeroplane construction is to produce an all‐metal machine, the time has not yet come when we can definitely say that this or that machine is entirely of metal, there being still a fair proportion of the structure of most light aeroplanes in which wood plays a very important part, both from the point of view of the greater facilities existing for repair and the lesser cost of production.

Details

Aircraft Engineering and Aerospace Technology, vol. 5 no. 12
Type: Research Article
ISSN: 0002-2667

Book part
Publication date: 1 November 2018

Abstract

Details

William A. Paton: A Study of his Accounting Thought
Type: Book
ISBN: 978-1-78756-408-4

Article
Publication date: 6 November 2007

Damian Ramajo, Angel Zanotti and Norberto Nigro

The purpose of this paper is to assess a phenomenological zero‐dimensional model (0‐D model) in order to evaluate both the in‐cylinder tumble motion and turbulence in…

Abstract

Purpose

The purpose of this paper is to assess a phenomenological zero‐dimensional model (0‐D model) in order to evaluate both the in‐cylinder tumble motion and turbulence in high‐performance engine, focusing on the capability and sensitivity of the model.

Design/methodology/approach

The study was performed using a four‐valve pentroof engine, testing two different intake ports. The first one was a conventional port and the second one was design in such a way to promote tumble. CFD simulations for admission and compression strokes under different engine conditions were carried out. Then, the in‐cylinder entrance mass and mean velocities from CFD were imposed as boundary conditions in the 0‐D model.

Findings

Marked discrepancies between 0‐D model and CFD results were found. As expected, for the original port, CFD results displayed a poor tumble generation during the admission period. It was followed by a fast degradation of the tumble momentum along the compression stroke due to it was not dominant over the other two momentum components. 0‐D model overestimated the entrance‐tumble but underestimated the vortex degradation along the compression stroke, resulting in higher tumble predictions, thereby it is not recommended for low‐tumble engines. As for the modified port, 0‐D model assumptions were closer to the in‐cylinder flow field from CFD, but results underestimated the entrance‐tumble during the intake stroke and predicted excessive tumble at the end of the compression stroke. Summarizing, 0‐D model neither showed sensitivity to changes in the intake port because of the scarce information about the entrance‐flow field nor it was not suitable to evaluate the tumble degradation.

Originality/value

The limitations of the current model were highlighted, given possible guidelines in order to improve it.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 17 no. 8
Type: Research Article
ISSN: 0961-5539

Keywords

Article
Publication date: 1 July 1940

A.R. Weyl

As the most common aeronautical timber is SITKA or silver spruce, its main deficiencies will be of special interest. The essential properties and defects appearing in…

Abstract

As the most common aeronautical timber is SITKA or silver spruce, its main deficiencies will be of special interest. The essential properties and defects appearing in converted timber, i.e., at planed surfaces (rough portions are unsuitable for timber selection) are as follows:

Details

Aircraft Engineering and Aerospace Technology, vol. 12 no. 7
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 June 1940

A.R. Weyl

IN wooden aeroplane manufacture, the technique to be adopted in the workshop is more or less a matter of the engineering experience gained by mistakes and disappointments.

Abstract

IN wooden aeroplane manufacture, the technique to be adopted in the workshop is more or less a matter of the engineering experience gained by mistakes and disappointments.

Details

Aircraft Engineering and Aerospace Technology, vol. 12 no. 6
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 7 March 2016

Richard Anthony Foss

The purpose of this paper is to carry out a detailed investigation of the mechanisms operating during decision making by the honey bee swarm, which is now considered to be…

Abstract

Purpose

The purpose of this paper is to carry out a detailed investigation of the mechanisms operating during decision making by the honey bee swarm, which is now considered to be one of the best examples of collective decision making outside the human domain.

Design/methodology/approach

This investigation is based on a review of the last 60 years’ published literature about swarm behaviour. It introduces a different perspective to the work by utilising a cybernetic model of a self-organising information network to analyse the findings of this body of research.

Findings

Scout bees evaluating potential nest sites accumulated support for their site by differential net recruitment, so the total scout numbers present at each site was a good measure of the total evidence in favour of the site and hence the relative probability of choosing it as the swarm’s new home. The accumulation of evidence continued at a number of alternative nest site locations until a critical quorum threshold was sensed at one of them. The first alternative to reach the threshold was chosen as the preferred nest site. Quorum scouts then prepared the swarm for departure and steered it to its new home.

Originality/value

Swarm decision making has not been modelled as a self-organising information network before. This novel approach reveals how a combination of network modifications, self-amplification, self-attenuation, cross-inhibition, integration and quorum mechanisms together contribute towards accurate group decision making.

Details

Kybernetes, vol. 45 no. 3
Type: Research Article
ISSN: 0368-492X

Keywords

Article
Publication date: 2 March 2015

Richard Foss

The purpose of this paper is to investigate how a viable system, the honey bee swarm, gathers meaningful information about potential new nest sites in its problematic…

Abstract

Purpose

The purpose of this paper is to investigate how a viable system, the honey bee swarm, gathers meaningful information about potential new nest sites in its problematic environment.

Design/methodology/approach

This investigation uses a cybernetic model of a self-organising information network to analyse the findings from the last 60 years published research on swarm behaviour.

Findings

Nest site scouts used a modified foraging network to carry out a very thorough survey of the swarm’s problematic environment, providing the swarm with a considerable diversity of potential nest sites for consideration. The swarm utilised a number of randomly recruited groups of scouts to obtain numerous independent opinions about potential nest sites, each privately evaluated, publicly reported and repeatedly tested by new recruits. Independent evaluation of site quality was balanced by interdependent reporting of site location. Noise was reduced by integration over a large number of individual scouts and over a period of time. The swarm was therefore able to reduce potential sources of bias, distortion and noise, providing it with comparatively reliable information for decision making.

Originality/value

Information gathering by a honey bee swarm has not previously been modelled as a self-organising information network. The findings may be of value to human decision-making groups.

Details

Kybernetes, vol. 44 no. 3
Type: Research Article
ISSN: 0368-492X

Keywords

Abstract

Details

Progress in Psychobiology and Physiological Psychology
Type: Book
ISBN: 978-0-12-542118-8

Article
Publication date: 14 October 2010

Maxine Stephenson

Despite the exponential spread of the British Empire by the late nineteenth century, there remained in England a continued indifference to “the Empire”. In 1883, J.R…

Abstract

Despite the exponential spread of the British Empire by the late nineteenth century, there remained in England a continued indifference to “the Empire”. In 1883, J.R. Seeley, Regius Professor of Modern History in the University of Cambridge, had expressed concern because ‘we think of Great Britain too much and of Greater Britain too little’. People had to rethink their understandings of nation and empire, he suggested, and steps had to be taken to modify what he saw as a ‘defective constitution’. Seeley’s lecture series had prompted debate about ‘the imperial question’, but the ‘anomalous political arrangements’ and the reluctance of the people to think imperially persisted. Insularity was not exclusive to the people in Britain, however. Because of their preoccupation with their own local affairs, it was suggested, there had been little opportunity for people from other parts of the empire to devote much time to the larger questions of imperial and common citizenship.

Details

History of Education Review, vol. 39 no. 2
Type: Research Article
ISSN: 0819-8691

Keywords

1 – 10 of 341