نتایج جستجو برای: wind environment
تعداد نتایج: 596074 فیلتر نتایج به سال:
Human actions such as electricity generation are contributory causes of climate change. In a quest to reduce the emission greenhouse gases associated with from fossil fuels, world is turning renewables. Renewable sources, however, also do have an impact on environment. Likewise, renewable dependent climate. Hydro, Wind, and Solar popular energy sources for electricity. This work reviews these r...
Although fossil fuel is the main energy supplier of the worldwide economy, due to its ad‐ verse effects on environment, the scientists look for alternative resources in power genera‐ tion. Electricity generation using renewable energy has been well recognized as environmentally friendly, socially beneficial, and economically competitive for many appli‐ cations. Wind turbines, photovoltaic syste...
Space weathering is the collection of physical processes acting to erode and chemically modify planetary surfaces directly exposed to space environments of planetary magnetospheres, the heliosphere, and the local interstellar environment of the solar system. Space weathering affects the physical and optical properties of the surfaces of planetary bodies, so understanding its specifics is critic...
We have been studying the interaction between the Be star and the pulsar in the TeV binary PSR B1259 63/LS 2883, using 3-D SPH simulations of the tidal and wind interactions in this Be–pulsar system. We first ran a simulation without pulsar wind nor Be wind, while taking into account only the gravitational effect of the pulsar on the Be disk. In this simulation, the gas particles are ejected at...
Context. The stellar mass loss rate is important for the rotational evolution of a star and for its interaction with the circumstellar environment. The analysis of astrospheric absorption features enables an empirical determination of mass loss rates of cool stars other than the Sun. Aims. We develop a model for the wind properties of cool main-sequence stars, which comprises their wind ram pre...
In this paper optimal torque control (OTC) of stand-alone variable-speed small-scale wind turbine equipped with a permanent magnet synchronous generator and a switch- mode rectifier is presented. It is shown that with OTC method in standalone configuration, power coefficient could be reached to its maximum possible value, i.e. 0.48. An appropriate control algorithm based on turbine characterist...
Dust storms in arid and semi-arid regions have harmful impacts on the environment, the economy, and the health of local and global communities. In this study, the frequency of annual dust events in twenty-five stations and five climatic variables including rainfall, maximum annual wind speed, average annual wind speed, maximum annual temperature, and average annual temperature in arid regions o...
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