Results 21 to 30 of about 11,572,657 (308)

Aircraft Wake Vortex Decay in Ground Proximity : Physical Mechanisms and Artificial Enhancement [PDF]

open access: yes, 2012
Aircraft wake vortex evolution in ground proximity is investigated numerically with large eddy simulations (LES). The simulations are performed with different modifications of the ground surface in order to trigger rapid vortex decay or to simulate the ...
Anton Stephan   +5 more
core   +1 more source

Numerical Investigation of the Wing-in-Ground Effect on Aerodynamic Characteristics [PDF]

open access: yesProblemy Mechatroniki, 2016
This paper presents the numerical evaluation of ground (proximity) effects on the basic aerodynamic characteristics of a specifically designed airplane model.
Stanisław WRZESIEŃ   +2 more
doaj   +1 more source

Preserved local but disrupted contextual figure-ground influences in an individual with abnormal function of intermediate visual areas. [PDF]

open access: yes, 2012
Visual perception depends not only on local stimulus features but also on their relationship to the surrounding stimulus context, as evident in both local and contextual influences on figure-ground segmentation.
Bentin, S   +15 more
core   +1 more source

A Site Amplification Model for Crustal Earthquakes

open access: yesGeosciences, 2018
A global dataset which is composed of more than 20,000 records is used to develop an empirical nonlinear soil amplification model for crustal earthquakes. The model also includes the deep soil effect. The soil nonlinearity is formulated in terms of input
M. Abdullah Sandıkkaya   +1 more
doaj   +1 more source

Perchlorate Exposure is Associated with Oxidative Stress and Indicators of Serum Iron Homeostasis among NHANES 2005–2008 Subjects

open access: yesBiomarker Insights, 2015
Perchlorate (ClO 4 – ), an oxidizing agent, is a ubiquitous environmental pollutant. Several studies have investigated its thyroid hormone disrupting properties. Its associations with other biological measures are largely unknown.
Dina M. Schreinemachers   +3 more
doaj   +1 more source

Precision Landing of Unmanned Aerial Vehicle under Wind Disturbance Using Derivative Sliding Mode Nonlinear Disturbance Observer-Based Control Method

open access: yesAerospace
Unmanned aerial vehicles (UAVs) are extensively employed in civilian and military applications because of their excellent maneuverability. Achieving fully autonomous quadrotor flight and precision landing on a wireless charging station in the presence of
Sunghun Jung
doaj   +1 more source

Earthquake-induced ground failures in Italy from a reviewed database [PDF]

open access: yesNatural Hazards and Earth System Sciences, 2014
A database (Italian acronym CEDIT) of earthquake-induced ground failures in Italy is presented, and the related content is analysed. The catalogue collects data regarding landslides, liquefaction, ground cracks, surface faulting and ground changes ...
S. Martino, A. Prestininzi, R. W. Romeo
doaj   +1 more source

Ground-State versus Transition-State Effects on the α-Effect as Expressed by Solvent Effects

open access: yes, 2016
Ground-State versus Transition-State Effects on the α-Effect as Expressed by Solvent ...
Erwin Buncel (1695721)   +1 more
core   +1 more source

Exploiting ground effects for surface transport noise abatement

open access: yesNoise Mapping, 2016
Growing demand on transportation, road and railway networks has increased the risk of annoyance from these sources and the need to optimise noise mitigation.
Attenborough Keith   +2 more
doaj   +1 more source

Identifying the Lambertian Property of Ground Surfaces in the Thermal Infrared Region via Field Experiments

open access: yesRemote Sensing, 2017
Lambertian surfaces represent an important assumption when constructing thermal radiance transfer equations for remote sensing observations of ground surface temperatures.
Lili Tu   +5 more
doaj   +1 more source

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