Results 21 to 30 of about 707,618 (318)

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

Problemy 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, Michał FRANT, Maciej MAJCHER   +2 more
doaj   +1 more source

A Site Amplification Model for Crustal Earthquakes

Geosciences, 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, L. Doğan Dinsever   +1 more
doaj   +1 more source

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

Biomarker 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, Andrew J. Ghio, Jon R. Sobus, Marc A. Williams   +3 more
doaj   +1 more source

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

Natural 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

Effects of Ground Subsidence on Permafrost Simulation Related to Climate Warming

Atmosphere, 2023
We develop a moving-mesh permafrost model that contains a ground subsidence computation module to estimate the effects of ground subsidence on permafrost simulation under different warming scenarios.
Zhe Sun, Lin Zhao, Guojie Hu, Huayun Zhou, Shibo Liu, Yongping Qiao, Erji Du, Defu Zou, Changwei Xie   +8 more
doaj   +1 more source

Influence of diffuser angle on a bluff body in ground effect [PDF]

, 2003
The forces and pressures on a generic bluff body in ground effect were investigated. The bluff-body model was equipped with interchangeable underbody diffuser ramps and side plates. Five different diffuser angles were tested: 5, 10, 15, 17, and 20 deg to
Zhang, Xin, Ruhrmann, Andreas
core   +1 more source

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

Aerospace
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

Exploiting ground effects for surface transport noise abatement

Noise 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, Bashir Imran, Taherzadeh Shahram   +2 more
doaj   +1 more source

Ground effect aerodynamics of racing cars

, 2006
We review the progress made during the last thirty years on ground effect aerodynamics associated with race cars, in particular open wheel race cars.
Zhang, Xin, Toet, Willem, Xin Zhang, Willem Toet, Jonathan Zerihan, Zerihan, Jonathan   +5 more
core   +1 more source

Non-Euclidean Geometry, Nontrivial Topology and Quantum Vacuum Effects

Universe, 2018
Space out of a topological defect of the Abrikosov–Nielsen–Olesen (ANO) vortex type is locally flat but non-Euclidean. If a spinor field is quantized in such a space, then a variety of quantum effects are induced in the vacuum.
Yurii A. Sitenko, Volodymyr M. Gorkavenko   +1 more
doaj   +1 more source