نتایج جستجو برای: flight
تعداد نتایج: 45494 فیلتر نتایج به سال:
Parents play a key role in determining the phenotype of their offspring. However, relatively few studies have investigated whether parents can change their offspring's behaviour in a sustained way that persists into adulthood. With experiments on the burying beetle, Nicrophorus vespilloides, we investigated how the developmental environment created by parents affects their offspring's wing morp...
1 Departamento de Fı́sica, Universidade Federal do Paraná, Curitiba–PR, 81531-990, Brazil 2 Laboratório de Fı́sica Teórica e Computacional, Departamento de Fı́sica, Universidade Federal de Pernambuco, Recife–PE, 50670-901, Brazil 3 Instituto de Fı́sica, Universidade Federal de Alagoas, Maceió–AL, 57072-970, Brazil 4 Consortium of the Americas for Interdisciplinary Science, University of New Mexico,...
We prove that certain natural random variables associated with the local eigenvalue statistics for generalized lattice Anderson models constructed with finite-rank perturbations are compound Poisson distributed. This distribution is characterized by the fact that the Lévy measure is supported on at most a finite set determined by the rank. The proof relies on a Minami-type estimate for finite-r...
Let F be a life distribution with survival function F = 1 F and 00 — finite mean y * j n F(x)dx. The scaled total time on test transform -1 F ( t ) — <P,,(t) = /n /F(x)dx/y was introduced by Barlow and Campo (1975) as a r U tool in the statistical analysis of life data. The properties IFR, IFRA, NBUE, DMRL and heavy-tailedness can be translated to properties of tp„(t). r We discuss the previous...
INTRODUCTION The psychological workload of flying has been shown to increase heart rate (HR) during flight simulator operation. The association between HR changes and flight performance remains unclear. METHODS There were 15 pilots who performed a combat flight mission in a Weapons Tactics Trainer simulator of an F-18 Hornet. An electrocardiogram (ECG) was recorded, and individual incremental...
Effects of Flight Dynamics on Performance of One Axis Gimbal System, Considering Disturbance Torques
The gimbal stabilization mechanism system is used to provide the stability to an object mounted on the gimbal by isolating it from the base angular motion and vibration. In this paper the model of one axis gimbal system with dynamics flying object is introduced. The gimbal torque relationships are obtained using Newton’s second law equation on the assumption that gimbal is rigid body. The syste...
Time-of-flight diffraction method (ToFD) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves. Although ToFD can measure through-wall length of defect accurately, this method is not capable of measuring horizontal defect size. In this paper, a new ToFD method for evaluating horizontal planar defects is presented. The finite...
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