نتایج جستجو برای: flight alignment
تعداد نتایج: 122516 فیلتر نتایج به سال:
BACKGROUND For over 60 yr, researchers and engineers have based investigations and the design of cockpit displays and structures upon the presupposition that during flight the pilot maintains a head alignment coincident with the aircraft's vertical axis (z-axis). Recent simulator studies have verified the existence of a pilot neck reflex which refutes this long-standing assumption. This reflex,...
In this paper, an approximate solution of sensitivity matrix of required velocity with final velocity constraint is derived using a piecewise linear gravity assumption. The total flight time is also fixed for the problem. Simulation results show the accuracy of the method. Increasing the midway points for linearization, increases the accuracy of the solution, which this, in turn, depends on the...
The internal transcribed spacer (ITS) sequences alignment and proteomic difference of Anoectochilus interspecies have been studied by means of ITS molecular identification and surface enhanced laser desorption ionization time of flight mass spectrography. Results showed that variety certification on Anoectochilus by ITS sequences can not determine species, and there is proteomic difference amon...
We derive a new method to infer from data the out-of-equilibrium alignment dynamics of collectively moving animal groups, by considering the maximum entropy model distribution consistent with temporal and spatial correlations of flight direction. When bird neighborhoods evolve rapidly, this dynamical inference correctly learns the parameters of the model, while a static one relying only on the ...
A new method, the time of flight-electron-stimulated desorption ion angular distribution method (TOF-ESDIAD), is described. The method permits the mapping of the lateral momentum distribution of adsorbed species on their adsorption sites. Examples of the study of the rotation of chemisorbed PF3 molecules and the frustrated lateral translation of chemisorbed CO molecules, both on single-crystal ...
A method is presented for the stress analysis of flight vehicles under different flight conditions including gust and control surface deflection (or maneuver) using the governing equations of rigid-body motions and elastic deformations. The Lagrangian approach is used to derive the governing equations of motions. For this purpose, the basic equations of motions are derived in terms of potential...
Unmanned aerial vehicles (UAVs) have been used for increasing research applications in atmospheric measurements. However, most current solutions these are based on a single UAV with limited payload capacity. In order to address the limitations of UAV-based approach, this paper proposes new concept measurements using tandem flying multicopters as distributed sensor platform. Key challenges propo...
Ratites (ostriches, emus, rheas, cassowaries, and kiwis) are large, flightless birds that have long fascinated biologists. Their current distribution on isolated southern land masses is believed to reflect the breakup of the paleocontinent of Gondwana. The prevailing view is that ratites are monophyletic, with the flighted tinamous as their sister group, suggesting a single loss of flight in th...
The drive towards utilizing small, cheap, autonomous aerial vehicles for military operations means that navigation systems that are robust to GPS denial must be employed. The simplest option available is to increase the accuracy of the inertial measurement unit (IMU), but this can substantially increase the price per operational unit. This paper presents an overview of the All-Source Navigation...
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