scholarly journals Model of power expenditure of animals and climate

2014 ◽  
Vol 2 (2) ◽  
pp. 407
Author(s):  
Mordovin ◽  
Michailov
Keyword(s):  
Power Expenditure

Lift and power requirements of hovering flight inDrosophila virilis

2002 ◽  
Vol 205 (16) ◽  
pp. 2413-2427 ◽  
Author(s):  
Mao Sun ◽  
Jian Tang
Keyword(s):  
Flight Control ◽  
Stokes Equations ◽  
Fruit Fly ◽  
The Body ◽  
Drosophila Virilis ◽  
Specific Power ◽  
Aerodynamic Forces ◽  
Hovering Flight ◽  
Power Expenditure ◽  
The Mean

SUMMARYThe lift and power requirements for hovering flight in Drosophila virilis were studied using the method of computational fluid dynamics. The Navier-Stokes equations were solved numerically. The solution provided the flow velocity and pressure fields, from which the unsteady aerodynamic forces and moments were obtained. The inertial torques due to the acceleration of the wing mass were computed analytically. On the basis of the aerodynamic forces and moments and the inertial torques, the lift and power requirements for hovering flight were obtained.For the fruit fly Drosophila virilis in hovering flight (with symmetrical rotation), a midstroke angle of attack of approximately 37°was needed for the mean lift to balance the insect weight, which agreed with observations. The mean drag on the wings over an up- or downstroke was approximately 1.27 times the mean lift or insect weight (i.e. the wings of this tiny insect must overcome a drag that is approximately 27 % larger than its weight to produce a lift equal to its weight). The body-mass-specific power was 28.7 W kg-1, the muscle-mass-specific power was 95.7 W kg-1 and the muscle efficiency was 17 %.With advanced rotation, larger lift was produced than with symmetrical rotation, but it was more energy-demanding, i.e. the power required per unit lift was much larger. With delayed rotation, much less lift was produced than with symmetrical rotation at almost the same power expenditure; again, the power required per unit lift was much larger. On the basis of the calculated results for power expenditure, symmetrical rotation should be used for balanced, long-duration flight and advanced rotation and delayed rotation should be used for flight control and manoeuvring. This agrees with observations.

A Distributed Scalar Controller Selection Scheme for Redundant Data Elimination in Sensor Networks

2017 ◽  
Vol 7 (1) ◽  
pp. 91-104 ◽  
Author(s):  
Sushree Bibhuprada B. Priyadarshini ◽  
Suvasini Panigrahi
Keyword(s):  
Sensor Networks ◽  
Data Transmission ◽  
Central Point ◽  
Selection Scheme ◽  
Coverage Ratio ◽  
Redundant Data ◽  
Power Expenditure ◽  
Exchange Information ◽  
Selection For

This research presents a novel distributed strategy for actuation of reduced number of cameras motivated by scalar controller selection for eliminating the amount of redundant data transmission taking place in any geographic zone under speculation. The proposed framework is based on dividing the monitored region into a number of virtual compartments. A scalar controller is selected in each of the compartments, which is chosen in such a manner that its distance is the minimum among all the scalars from the central point of the concerned compartment. Further, all the cameras are arranged in a predetermined circular fashion. Whenever, an event takes place, the scalar controllers inform their respective cameras regarding its occurrence. The cameras collaboratively exchange information among themselves for deciding which among them are to be actuated. The least camera activation, enhanced coverage ratio, minimized redundancy ratio, reduced energy and power expenditure obtained from the experimental outcomes affirm the effectiveness of our proposed method over other approaches.

Paper C: Magnetic Suspension

1966 ◽  
Vol 181 (7) ◽  
pp. 145-150 ◽  
Author(s):  
G. R. Polgreen
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Linear Motor ◽  
Magnetic Suspension ◽  
Power Expenditure ◽  
Magnet Material ◽  
Permanent Field

Tracked transport by magnetic suspension using new ceramic permanent magnets is now practicable for slow as well as highest speeds. Vehicles float with clearance up to an inch on a magnetic field requiring no power expenditure, and hence without noise and the need for maintenance. Development that is now at the man-carrying model stage is described, including propulsion–braking by a simple d.c. linear motor that uses the track permanent field for excitation. The paper opens with an outline of latest progress in magnet material and design, on which this whole subject is based.

scholarly journals Model of power expenditure of animals and climate

2014 ◽  
Vol 2 (3) ◽  
pp. 298
Author(s):  
Mordovin ◽  
Michailov
Keyword(s):  
Power Expenditure

scholarly journals A computational investigation of lift generation and power expenditure of Pratt’s roundleaf bat (Hipposideros pratti) in forward flight

PLoS ONE ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. e0207613 ◽  
Author(s):  
Peter Windes ◽  
Xiaozhou Fan ◽  
Matt Bender ◽  
Danesh K. Tafti ◽  
Rolf Müller
Keyword(s):  
Computational Investigation ◽  
Forward Flight ◽  
Power Expenditure
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