نتایج جستجو برای: wind direction and velocity

تعداد نتایج: 16874819  

2010
Andy M. Reynolds Don R. Reynolds Alan D. Smith Jason W. Chapman

Migratory insects flying at high altitude at night often show a degree of common alignment, sometimes with quite small angular dispersions around the mean. The observed orientation directions are often close to the downwind direction and this would seemingly be adaptive in that large insects could add their self-propelled speed to the wind speed, thus maximising their displacement in a given ti...

Journal: :Applied sciences 2022

The numerical modeling of the effect wind direction and velocity over air cooling PV panels with heat sinks is realized. During study, a random panel typical characteristics was analyzed for three different directions—towards its back, towards front from side. analysis realized on fixed panel, oriented to south, an inclination 45 degrees horizontal position. accuracy simulation achieved by comp...

2006
J. C. Kasper A. J. Lazarus J. T. Steinberg K. W. Ogilvie A. Szabo

[1] We present techniques for comparing measurements of velocity, temperature, and density with constraints imposed by the plasma physics of magnetized bi-Maxwellian ions. Deviations from these physics-based constraints are interpreted as arising from measurement errors. Two million ion spectra from the Solar Wind Experiment Faraday Cup instruments on the Wind spacecraft are used as a case stud...

2013
GIACOMO VALERIO IUNGO YU-TING WU FERNANDO PORTÉ-AGEL

Field measurements of the wake flow produced from a 2-MW Enercon E-70 wind turbine were performed using three scanning Doppler wind lidars. A GPS-based technique was used to determine the position of the wind turbine and the wind lidar locations, as well as the direction of the laser beams. The lidars used in this study are characterized by a high spatial resolution of 18 m, which allows the de...

Hosseinalizadeh, Mohsen, Kalamati, Ahmad Reza , Mohammadian Behbahani, Ali , Rezaei, Hassan ,

Introduction: The origination of dust is often due to the wind erosion process. However dust emissions are sometimes the result of industrial activity during the production process, which is called industrial dust. One of these industries is rock crushing whose raw material is transferred from the mines to the factory. During the process of crushing, smaller pieces are eventually converted. The...

2018
J. Mann N. Angelou M. Sjöholm T. Mikkelsen

Rapid variations in the height of the recirculation zone are measured with a scanning wind lidar over a small escarpment on the Bolund Peninsula. The lidar is essentially a continuous-wave laser Doppler anemometer with the capability of rapidly changing the focus distance and the beam direction. The instrument measures the line-ofsight velocity 390 times per second and scans ten wind profiles f...

ژورنال: مهندسی دریا 2009
تائبی, سهیلا, گلشنی, علی اصغر,

The goal of this study was to provide quality assurance for QuikSCAT wind speed and direction in Iranian adjacent seas including the Caspian Sea, the Persian Gulf and the Gulf of Oman. Synoptic station wind data and numerical atmospheric models in the study area were compared with QuikSCAT wind field. Time difference and spatial separation between the QuikSCAT and synoptic observations were lim...

Extended abstract 1- Introduction Threshold wind velocity is a major influencing variable in transportation of soil particles and dust production. It is considered as an important component in many theoretical equations and numerical models due to its importance in wind erosion studies (Stout & Zobeck, 1996). The wind tunnel method (fixed and portable), empirical relationships and sediment tr...

2016
Adrien C. H. Martin Christine Gommenginger Jose Marquez Sam Doody Victor Navarro Christopher Buck

Conventional and along-track interferometric (ATI) Synthetic Aperture Radar (SAR) senses the motion of the ocean surface by measuring the Doppler shift of reflected signals. Measurements are affected by a Wind-wave-induced Artifact Surface Velocity (WASV) which was modeled theoretically in past studies and has been estimated empirically only once before with Envisat ASAR by Mouche et al. (2012)...

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