Mitchell Wing and Jacek F. Gieras
The increased use of permanent magnet synchronous motors in small to medium power applications has made it imperative that these motors' performance can be modelled successfully…
Abstract
The increased use of permanent magnet synchronous motors in small to medium power applications has made it imperative that these motors' performance can be modelled successfully. The accuracy of calculating the synchronous reactances determines the success of the modelling technique. An analytical method and the finite element method are used to calculate the synchronous reactances of two prototype synchronous motors. The calculations are compared with measurement for both motors. The results show that the finite element method is more reliable in obtaining synchronous reactances than the analytical method for rotor designs that are very intricate, although both methods show reasonable accuracy.
MICHAEL K. JUDIESCH, FRANK L. SCHMIDT and MICHAEL K. MOUNT
Recently, we (Judiesch, Schmidt, & Mount, 1992) concluded that the Schmidt et al. (1979) SDy estimation procedure results in downwardly biased estimates of utility. This…
Abstract
Recently, we (Judiesch, Schmidt, & Mount, 1992) concluded that the Schmidt et al. (1979) SDy estimation procedure results in downwardly biased estimates of utility. This conclusion led us to propose a modification of the Schmidt et al. method that involves estimating SDy as the product of estimates of the coefficient of variation (SDy/ Y) and an objective estimate of the average value of employee output (Y). The present article reviews the rationale underlying our conclusion that this modification of the Schmidt et al. method of estimating SDy results in more accurate estimates of SDy, and hence, utility.
Australia has developed a social and economic identity strongly influenced by its physical isolation as an island continent with a relatively small population. This article…
Abstract
Australia has developed a social and economic identity strongly influenced by its physical isolation as an island continent with a relatively small population. This article describes four linked strategies being implemented to position New South Wales public libraries for success in the emerging information economy in Australia. These strategies of promoting Internet access, creating client‐focused content and services, developing strategic partnerships and renewing a sense of place are all connected by a common desire: to conquer the “tyranny of distance”.
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Explores the distinctive behaviours and organizational capabilities which enable firms to innovate successfully. Identifies four aspects of innovation which sustain the firm’s…
Abstract
Explores the distinctive behaviours and organizational capabilities which enable firms to innovate successfully. Identifies four aspects of innovation which sustain the firm’s abilities to deliver superior customer value. These are: culture and climate; the management of assets and capabilities; structure and controls; and new product and process development. Argues that the over‐reliance on the traditional approach to innovation – the development of new products and services – is too limited a view and may even be preventing business leaders from adopting this broader, organisational approach where the contribution from each area of the business can be multiplicative when kept in balance. Finally, issues the role of business leaders in removing barriers to innovation and nurturing a multi‐faceted approach across the firm and draws conclusions.
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The purpose of this paper is to explore dirty work sites within an academic context. Working with particular “unloved” groups (Fielding, 1993) can present a number of challenges…
Abstract
Purpose
The purpose of this paper is to explore dirty work sites within an academic context. Working with particular “unloved” groups (Fielding, 1993) can present a number of challenges to researchers, and if professional boundaries are not carefully maintained, researchers can be seen as “dirty workers” within an academic context.
Design/methodology/approach
The paper draws a qualitative research project that explores women's involvement with nationalist movements in the UK.
Findings
Researching “unloved” groups, and in particular racist organizations, presents a number of potential emotional and professional, and can render researchers “dirty workers” if clear professional boundaries are not maintained.
Originality/value
Examining academia and some academic research as a dirty work site adds to existing literature (Kreiner et al., 2006) that suggests any occupation can have a “dirty work” element that must be negotiated. This paper presents new challenges for managing spoiled “dirty” identities, and suggests that identity management is context-specific.
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Lutz Taubert, Garrett Kay, Israel Wygnanski and Michael Ol
This paper aims to address shortcomings of current tiltrotor designs, such as the small aspect ratio of the wings, large download and the close proximity of the rotor tips. It…
Abstract
Purpose
This paper aims to address shortcomings of current tiltrotor designs, such as the small aspect ratio of the wings, large download and the close proximity of the rotor tips. It also aims to avoid the complex transition of tiltrotors to normal airplane mode.
Design/methodology/approach
This design combines tiltrotor and tiltwing aircraft designs into a hybrid that is augmented by active flow control, using a gimbaled channel wing for attitude control in hover.
Findings
The proposed hybrid design is based on experimental results of components that were tested individually for potential use in hover and steep ascend from a stationary position.
Originality/value
This research was inspired by the extremely short take-off of the V-22, when its rotors were tilted forward. It combines several design approaches in a unique way to achieve extremely short take-off capabilities combined with high-speed and reduced maintenance costs.
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Per-Åke Nylander, Claes Holm and Odd Lindberg
This study aims to analyze prisoners’ experiences of prison drug-treatment programs in Sweden. How do they describe their personal relationships with the prison staff and with…
Abstract
Purpose
This study aims to analyze prisoners’ experiences of prison drug-treatment programs in Sweden. How do they describe their personal relationships with the prison staff and with other prisoners in the wings? How do they describe the social climate and the control in drug-treatment wings? How could differences between these wings be understood?
Design/methodology/approach
The data consist of observations and face-to-face interviews with male and female prisoners in three Swedish prison drug-treatment wings. Analytical concepts used are roles, relationships and rituals.
Findings
The prisoners’ relationships with prison officers seemed connected to what kinds of rituals the prisoners and staff engaged in. In all three treatment wings, the staff and prisoners were involved in natural rituals. This was most frequent in the women’s prison with a 12-step program. The prisoners were frustrated with control measures but were mainly positive to the measures as preventing drugs from coming into the wing.
Research limitations/implications
Only three prison wings, however in varying prisons, have been studied.
Originality/value
These results gives a useful prisoners’ perspective on the development of drug-prevention and treatment in different kinds of prisons.
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The author explores questions of authenticity in the media industry by showing how right-wing media figures look to present their views as authentic by defining themselves as…
Abstract
The author explores questions of authenticity in the media industry by showing how right-wing media figures look to present their views as authentic by defining themselves as citizen journalists and positioning themselves in opposition to mainstream media. Looking at two case studies from the United States, Andrew Breitbart and Mike Cernovich, the author shows how the language of citizen journalism (amateurism, independence, immediacy) is co-opted by such figures to appeal to increasingly distrustful and antagonistic conservative media audiences.
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Aircraft structures are built up of previously constructed members comprising a skin part and stress‐carrying structure, the structures being completed by interattaching the…
Abstract
Aircraft structures are built up of previously constructed members comprising a skin part and stress‐carrying structure, the structures being completed by interattaching the members in a surface containing the neutral axis of the completed structure. In one form, a wing is built up of components comprising spar parts 1A, 3A, ribs 4A, 4, 4B, and metal skin 5. The appropriate spars are butt‐jointed together and the structure is completed by a nose fairing 8 which may be secured by wire pins 9. A tank 10 may be housed in the wing. In a modification, the skin is supported by a corrugated sheet attached to a capping strip secured to brackets which are connected to the lap‐jointed spars. In a further modification, the spar is formed by securing flange portions, which may be built up of laminations, to a lightened web. A wing flap may be hinged to the trailing edge of the wing. A fuselage may similarly be built up of components 71, 72 butt jointed as at 73. In a modification of this form, a bomb 88 may be housed in the fuselage, hinged doors 89 being provided. A tapering fuselage may be built from blanks of different dimensions pressed to shape by a single set of tools. The fuselage may be built up of quadrantal portions, and decks and floorings may be incorporated in the stiffening members. A seaplane float may be constructed in a similar manner.
Cross‐connected engines are fitted with a non‐return valve 12 in the pipe 11 between the pump chamber of one two‐diameter cylinder and the working chamber of an adjoining…
Abstract
Cross‐connected engines are fitted with a non‐return valve 12 in the pipe 11 between the pump chamber of one two‐diameter cylinder and the working chamber of an adjoining cylinder. Each pump‐piston is phased 90 deg. in advance of its associated power piston. The valves 12 are controlled by springs enclosed in a sealed chamber, are placed at the power‐cylinder end of the conduits, and closed by the power‐piston at the top of the stroke. They are inclined so as to divert the incoming charge towards the cylinder head, the wall of the inlet port adjacent to the half‐circumference of the valve head which is distant from the cylinder head being a close fit to said half‐circumference.