نتایج جستجو برای: radio waves
تعداد نتایج: 209947 فیلتر نتایج به سال:
In this issue of the Biochemical Journal, Freidman et al. report the findings of a study to look at the potential of mobile phones to activate intracellular signalling cascades. They found that radio waves corresponding to the frequency commonly used by mobile phones are able to activate ERK1/2 (extracellular-signal-regulated kinases 1 and 2). This effect was observed even at intensities lower ...
Vegetation is an indispensable feature of most outdoor wireless channel environments. The interaction between radio waves and vegetation has been researched for several decades. Because of the complex structure of the foliage, composed of randomly oriented trunks, branches, twigs and leaves, the involved physical process in the propagation of the radiowave through vegetation is complex. Accurat...
From a simple and a global coupled model, we showed that the tropical and extratropical oceanatmosphere interactions and the teleconnection between the tropics and extratropics in these interactions are responsible for the co-variations of the decadal to interdecadal climate fluctuations in the tropical and extratropical Pacific. The subtropical oceanic Rossby waves are found to play an importa...
The dynamics and bifurcations of convective waves in rotating and buoyancy-driven spherical Rayleigh-Bénard convection are investigated numerically. The solution branches that arise as rotating waves (RWs) are traced by means of path-following methods, by varying the Rayleigh number as a control parameter for different rotation rates. The dependence of the azimuthal drift frequency of the RWs o...
The mechanism for transitions from phase to defect chaos in the one-dimensional complex Ginzburg-Landau equation (CGLE) is presented. We describe periodic coherent structures of the CGLE, called modulated amplitude waves (MAWs). MAWs of various periods P occur in phase chaotic states. A bifurcation study of the MAWs reveals that for sufficiently large period, pairs of MAWs cease to exist via a ...
In a radio-wave shield, a method of blocking radio waves in which a space is surrounded by a high loss dielectric material, some waves leak through the long and slender gap between the walls. We analyzed the losses in the gap section and in the gap aperture. The former was analyzed by using an equivalent parallel board transmission line, the latter by using an aperture field method. Here we des...
RFID applied to vehicular identification operates under a complex electromagnetic environment; the radio waves emitted by the reader, propagate, attenuate and join to the reflected waves from the ground and adjacent vehicles, being received by the antenna tag; part of the electromagnetic wave signal is backscattered/reflected back to the reader. In order to obtain a propagation model is carried...
It is pointed, that for the asymptotically strong superSchwinger magnetic field B, exceeding the critical value of Bcr = (mc/eh) = 4.4 · 10 Gauss, the vacuum polarization effects become important not only in the γ-range, but also for softer electromagnetic quanta, including X-rays, optic photons and for electromagnetic waves of radio frequencies. This is a consequence of the linearly growing te...
The next decade will very likely see the birth of a new field of astronomy as we become able to directly detect gravitational waves (GWs) for the first time. The existence of GWs is one of the key predictions of Einstein's theory of general relativity, but they have eluded direct detection for the last century. This will change thanks to a new generation of laser interferometers that are alread...
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