Leadership Organization Development Journal, Feb 8, 2011
... that managers should recognise the advantage and disadvantage of different leadership style a... more ... that managers should recognise the advantage and disadvantage of different leadership style as behaviour may affect organisational politics ... Michie, S., Gooty, J. (2005), "Values, emotions, and authenticity: will the real leader please stand up?", The Leadership Quarterly, Vol ...
... as economic uncertainty, effective leadership and team work has never been so critically impo... more ... as economic uncertainty, effective leadership and team work has never been so critically important. Juliet Roper, Professor of ... DELVING DEEP (2007) (eds.) SPIRITUAL MOTIVATION: NEW THINKING FOR BUSINESS MANAGEMENT (2007) (Jeremy Ramsden, Shuhei Aida & ...
Volume 4: Ceramics; Concentrating Solar Power Plants; Controls, Diagnostics and Instrumentation; Education; Electric Power; Fans and Blowers, 2013
ABSTRACT We report on a numerical study on the performance of an innovative axial flow fan for la... more ABSTRACT We report on a numerical study on the performance of an innovative axial flow fan for large tunnel ventilation. Taking a lead from a previous biomimetic analysis on the performance of the flippers of the humpback whale, this whale-fan was designed with sinusoidal-like leading edge that mimic the tubercles of the whale. We found that this provided a resistance to stall and improved lift recovery in post-stall operations. The sinusoidal profile of the leading edge allowed to control the distribution of vorticity on the suction surface of the blades and increase the stall margin of the device.The paper discusses the design methodology that was followed to correlate the sinusoidal shape of the leading edge of the blade with the desired vorticity distribution at the trailing edge that was needed to control separation.In the paper we show the results of numerical computations carried out with the finite volume open-source code OpenFOAM on the whale-fan as well as a baseline fan with straight leading edge. Reynolds Averaged Navier-Stokes equations for incompressible flow were solved with a non-linear (cubic) eddy-viscosity k-ε model that was found able to control the eddy viscosity distribution in order to account for anisotropy of Reynolds stresses and better reproduce the three-dimensional properties of the flow field.The paper shows the performance chart of the whale-fan, derived from numerical computations, and gives an insight of the fluid flow mechanisms that are generated by the sinusoidal leading edge on the suction surface of the fan. A comparison with the baseline fan with straight leading edge is provided in order to highlight how the shape of the leading edges affect the performance of the fan.
This study seeks to examine the effect of abusive supervision on the &amp... more This study seeks to examine the effect of abusive supervision on the "dark side" of organizational citizenship behavior (OCB) and, specifically, compulsory citizenship behavior (CCB). The study focuses on the mediating role of psychological safety underpinning the relationship between abusive supervision and CCB, and the moderating role of Chinese traditionality in influencing the mediation. The authors tested the model with data of 434 dyads (employee-coworker pairs) in a large Chinese service company. Results indicated that psychological safety fully mediated the relationship between abusive supervision and CCB. The authors also found that Chinese traditionality moderated the strength of the mediated relationship between abusive supervision and CCB via psychological safety, such that the mediated relationship is weaker under high Chinese traditionality than under low Chinese traditionality. The article also discusses the implications, limitations, and future research directions.
Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine, 2010
... [7] proposed a stall-warning index (utilising ... when the signal-to-noise ratio (or, more pr... more ... [7] proposed a stall-warning index (utilising ... when the signal-to-noise ratio (or, more precisely, the instability signature-to-background noise ratio) is lowas is the case with regard to rotorstall-inception at ... [15] note that the relative positions of probes and blades influence visual ...
ABSTRACT The three dimensional structures of the blade tip vortical flow field is herein discusse... more ABSTRACT The three dimensional structures of the blade tip vortical flow field is herein discussed for an axial fan in a fully-ducted configuration. The investigation has been carried-out using an accurate in-house developed multi-level parallel finite element RANS solver, with the adoption of a non-isotropic two-equation turbulence closure. Due to the fully-ducted configuration the fan has a complex vortical flow field near the rotor tip. The tip clearance flows have been detected for operating conditions near peak efficiency and near stall, with multiple vortex formations being identified in both cases. The nature of the flow mechanisms in the fan tip region is correlated to the specific blade design features that promote reduced aerodynamic noise. It was found that the blade lean at the higher radii attenuates the sensitivity to leakage flow effects. Consequently, the rotor operates efficiently and with nearly unchanged noise emission approaching its throttling limit. The rotor loss behaviour, within the passage and downstream of it, is also discussed at both near design and part-load conditions.
ABSTRACT The three dimensional structures of the blade tip vortical flow field is discussed for a... more ABSTRACT The three dimensional structures of the blade tip vortical flow field is discussed for a family of axial fans in fully-ducted configuration, to investigate an improved blade tip concept. This concept is based on geometrical modification of datum blade by means of profiled end-plates at the tip. The investigation has been carried-out using an accurate in-house developed multi-level parallel finite element RANS solver, with the adoption of a non-isotropic two-equation turbulence closure. Due to the fully-ducted configuration, the fans have a complex vortical flow field near the rotor tip. The nature of the flow mechanisms in the fan tip region is correlated to the specific blade design features that promote reduced aerodynamic noise. It was found that the tip geometrical modification markedly affects the multiple vortex leakage flow behaviour, by reducing the pressure difference within the tip gap and by altering the near-wall fluid flow paths on the blade surfaces. The rotor loss behaviour, in the blade tip region, was also discussed in order to assess the effect of blade tip geometry onto the rotor efficiency.
Leadership Organization Development Journal, Feb 8, 2011
... that managers should recognise the advantage and disadvantage of different leadership style a... more ... that managers should recognise the advantage and disadvantage of different leadership style as behaviour may affect organisational politics ... Michie, S., Gooty, J. (2005), "Values, emotions, and authenticity: will the real leader please stand up?", The Leadership Quarterly, Vol ...
... as economic uncertainty, effective leadership and team work has never been so critically impo... more ... as economic uncertainty, effective leadership and team work has never been so critically important. Juliet Roper, Professor of ... DELVING DEEP (2007) (eds.) SPIRITUAL MOTIVATION: NEW THINKING FOR BUSINESS MANAGEMENT (2007) (Jeremy Ramsden, Shuhei Aida & ...
Volume 4: Ceramics; Concentrating Solar Power Plants; Controls, Diagnostics and Instrumentation; Education; Electric Power; Fans and Blowers, 2013
ABSTRACT We report on a numerical study on the performance of an innovative axial flow fan for la... more ABSTRACT We report on a numerical study on the performance of an innovative axial flow fan for large tunnel ventilation. Taking a lead from a previous biomimetic analysis on the performance of the flippers of the humpback whale, this whale-fan was designed with sinusoidal-like leading edge that mimic the tubercles of the whale. We found that this provided a resistance to stall and improved lift recovery in post-stall operations. The sinusoidal profile of the leading edge allowed to control the distribution of vorticity on the suction surface of the blades and increase the stall margin of the device.The paper discusses the design methodology that was followed to correlate the sinusoidal shape of the leading edge of the blade with the desired vorticity distribution at the trailing edge that was needed to control separation.In the paper we show the results of numerical computations carried out with the finite volume open-source code OpenFOAM on the whale-fan as well as a baseline fan with straight leading edge. Reynolds Averaged Navier-Stokes equations for incompressible flow were solved with a non-linear (cubic) eddy-viscosity k-ε model that was found able to control the eddy viscosity distribution in order to account for anisotropy of Reynolds stresses and better reproduce the three-dimensional properties of the flow field.The paper shows the performance chart of the whale-fan, derived from numerical computations, and gives an insight of the fluid flow mechanisms that are generated by the sinusoidal leading edge on the suction surface of the fan. A comparison with the baseline fan with straight leading edge is provided in order to highlight how the shape of the leading edges affect the performance of the fan.
This study seeks to examine the effect of abusive supervision on the &amp... more This study seeks to examine the effect of abusive supervision on the "dark side" of organizational citizenship behavior (OCB) and, specifically, compulsory citizenship behavior (CCB). The study focuses on the mediating role of psychological safety underpinning the relationship between abusive supervision and CCB, and the moderating role of Chinese traditionality in influencing the mediation. The authors tested the model with data of 434 dyads (employee-coworker pairs) in a large Chinese service company. Results indicated that psychological safety fully mediated the relationship between abusive supervision and CCB. The authors also found that Chinese traditionality moderated the strength of the mediated relationship between abusive supervision and CCB via psychological safety, such that the mediated relationship is weaker under high Chinese traditionality than under low Chinese traditionality. The article also discusses the implications, limitations, and future research directions.
Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine, 2010
... [7] proposed a stall-warning index (utilising ... when the signal-to-noise ratio (or, more pr... more ... [7] proposed a stall-warning index (utilising ... when the signal-to-noise ratio (or, more precisely, the instability signature-to-background noise ratio) is lowas is the case with regard to rotorstall-inception at ... [15] note that the relative positions of probes and blades influence visual ...
ABSTRACT The three dimensional structures of the blade tip vortical flow field is herein discusse... more ABSTRACT The three dimensional structures of the blade tip vortical flow field is herein discussed for an axial fan in a fully-ducted configuration. The investigation has been carried-out using an accurate in-house developed multi-level parallel finite element RANS solver, with the adoption of a non-isotropic two-equation turbulence closure. Due to the fully-ducted configuration the fan has a complex vortical flow field near the rotor tip. The tip clearance flows have been detected for operating conditions near peak efficiency and near stall, with multiple vortex formations being identified in both cases. The nature of the flow mechanisms in the fan tip region is correlated to the specific blade design features that promote reduced aerodynamic noise. It was found that the blade lean at the higher radii attenuates the sensitivity to leakage flow effects. Consequently, the rotor operates efficiently and with nearly unchanged noise emission approaching its throttling limit. The rotor loss behaviour, within the passage and downstream of it, is also discussed at both near design and part-load conditions.
ABSTRACT The three dimensional structures of the blade tip vortical flow field is discussed for a... more ABSTRACT The three dimensional structures of the blade tip vortical flow field is discussed for a family of axial fans in fully-ducted configuration, to investigate an improved blade tip concept. This concept is based on geometrical modification of datum blade by means of profiled end-plates at the tip. The investigation has been carried-out using an accurate in-house developed multi-level parallel finite element RANS solver, with the adoption of a non-isotropic two-equation turbulence closure. Due to the fully-ducted configuration, the fans have a complex vortical flow field near the rotor tip. The nature of the flow mechanisms in the fan tip region is correlated to the specific blade design features that promote reduced aerodynamic noise. It was found that the tip geometrical modification markedly affects the multiple vortex leakage flow behaviour, by reducing the pressure difference within the tip gap and by altering the near-wall fluid flow paths on the blade surfaces. The rotor loss behaviour, in the blade tip region, was also discussed in order to assess the effect of blade tip geometry onto the rotor efficiency.
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