Sentences with phrase «on radiation emitted»

As I understand «tempest device», this is a method of obtaining information from stray EMR from computers and the like, which picks up on radiation emitted from a device.

Or it can focus on the radiation emitted by the warmth of the dust itself.

Not exact matches

Its guidelines set maximum radiation exposure levels based on the amount of heat emitted by mobile phones.

Enormous clouds of these tiny grains scatter and absorb some of the radiation emitted from the stars — especially visible light — limiting what can be seen by telescopes here on Earth.

Upon Hawking's death on March 14 at age 76, his most famous discovery — that black holes aren't entirely black, but emit faint radiation — was still fueling debate.

The Sun is close to being a «black body» — that is, the light it emits is very much like that from a hypothetical black surface that absorbs all the radiation falling on it.

His new theory is that Hawking radiation can pick up some of the information stored on the event horizon as it is emitted, providing a way for it to get out.

Instead of relying on light waves emitted by electrons, it would use radiation emitted when the nucleus is excited to a high energy state, and then drops into a lower energy state.

«For decades, the three pulsars had emitted radiation so steadily that astronomers had come to rely on them as cosmic standards to calibrate their instruments — AGILE included,» Bhattacharje writes.

Like turning the knob on a radio, the team adjusted the pulse so that, if the artificial horizon emitted any Hawking radiation, its wavelength would be between 800 and 900 nanometers, a range that could not be confused with other sources such as laser - induced fluorescence.

Cloudy, humid days reverse the cooling from both radiation and sublimation — cloud cover prevents snow from emitting energy, and condensation of water vapor on the snow releases latent heat, warming the snow.

As well as its ability to pierce armour plating, DU has the unfortunate tendency to ignite on impact, creating clouds of uranium oxide dust — facilitating its spread in the environment and increasing the danger posed by the alpha radiation it emits.

«Our results are based on a realistic modelling of the accretion of gas onto the black holes, and of the radiation they emit, which is compatible with current astronomical observations.

TRAPPIST - 1 may be small and dim, but dwarf stars like it often emit powerful flares of radiation that could make water and life on its planets impossible without thick protective atmospheres.

The star has emitted a flare that made it 68 times brighter than usual, and could expose any life on its orbiting Earth - sized planet to fatal levels of ultraviolet radiation.

Astronomers have seen the star emit a superflare that briefly made it 68 times brighter than usual, and could expose any life on the surface of its orbiting Earth - sized planet to fatal levels of UV radiation.

While observing at the frequency that hydrogen atoms emit radiation, it will be able to image a circle on the sky as wide as about five Full Moons.

His idea was to use the High - Altitude Water Cherenkov observatory — made up of 300 water tanks on a Mexican mountaintop — to detect gamma radiation produced when charged particles emitted by pulsars interact with the gas between stars.

Conduction and thermal radiation are two ways in which heat is transferred from one object to another: Conduction is the process by which heat flows between objects in physical contact, such as a pot of tea on a hot stove, while thermal radiation describes heat flow across large distances, such as heat emitted by the sun.

This resulted in the first stars flickering on across the Universe, and the UV radiation they emitted interacted with the surrounding hydrogen gas.

Surface radiative energy budget plays an important role in the Arctic, which is covered by snow and ice: when the balance is positive, more solar radiation from the Sun and the Earth's atmosphere arrives on the Earth's surface than is emitted from it.

While its presence can be inferred from the gravitational pull it exerts on visible matter, the fact that it does not emit or absorb any radiation makes it next to impossible to detect.

According to a study published in the Journal of Investigative Dermatology harmful radiation emitted by TV screens, computer screens, and even uncovered fluorescent lights may cause dark spots on skin when you expose your skin to this radiation regularly for a longer periods of time.

Wi - fi is now everywhere and we are plugged 24/7 on our devices that emit radiations.

The technology works on the premise that the horse's body surface emits infrared radiation that can be detected by an infrared camera.

Isn't one important feature of cooling the stratosphere by emitting heat absorbed by ozone from incoming shortwave radiation, that this cooling has little effect on lower parts of the atmosphere since there is not much mixing between these air masses?

(This re-emission seems deeply mysterious to me, at least, in that AFAIK about the only characterizations we can place on it are that its quantized in definable ways and that there is a statistical time function of some sort associated — and yet it's also the most everyday thing imaginable, in that emitted thermal radiation is just what physical objects do, all the time, unless they are at absolute zero.

Greenhouse gases (like CO2, CH4 or water) absorb and re-radiate infra - red (IR) radiation that is emitted from the planet's surface at rates that depend on the temperature (the Stefan - Boltzmann law).

Now, all things emit radiation depending on their temperature [note2], the higher the temperature the more the amount of emitted energy.

The frequency at which photons are emitted or absorbed is small relative to the rate of energy redistribution among molecules and their modes, so the fraction of some molecules that are excited in some way is only slightly more or less than the characteristic fraction for that temperature (depending on whether photons absorption to generate that particular state is greater than photon emission from that state or vice versa, which depends on the brightness temperature of the incident radiation relative to the local temperature).

(Raman and Compton scattering and, I would assume, stimulated emission, also obey the laws of thermodynamics but if the material is not already in equilibrium with the incident radiation from all directions, the emitted radiation will depend on both the incident radiation and the temperature of the material, etc..)

What will the energy of the radiation emitted by a CO2 molecules in the atmosphere at NTP, and does it depend on the temperature of the air?

In the absence of solar heating, there is an equilibrium «skin temperature» that would be approached in the uppermost atmosphere (above the effective emitting altitude) which is only dependent on the outgoing longwave (LW) radiation to space in the case where optical properties in the LW part of the spectrum are invariant over wavelength (this skin temperature will be colder than the temperature at the effective emitting altitude).

Can you predict the spectrum on radiation received on surface and emitted to space?

You can think of a greenhouse gas as a form of albedo that operates on the infrared radiation emitted by the Earth.

Now on the matter of equilibrium, do you think objects stop emitting electromagnetic radiation, or not?

The infrared «cameras» measuring thermal radiation from bodies is not working on the camera principle of capturing reflection, they capture the heat emitted from a subject.

Effectively, infrared radiation emitted to space originates from an altitude with a temperature of, on average, — 19 °C, in balance with the net incoming solar radiation, whereas the Earth's surface is kept at a much higher temperature of, on average, +14 °C.

Because the climate system derives virtually all its energy from the Sun, zero balance implies that, globally, the amount of incoming solar radiation on average must be equal to the sum of the outgoing reflected solar radiation and the outgoing thermal infrared radiation emitted by the climate system.

In fact they emit far more energy in the middle of the day that they do at night; so those hot surfaces in the daytime, are the most efficient radiation coolers on the planet.

Each higher and cooler layer in turn emits thermal radiation corresponding to its temperature; and much of that also escapes directly to space around the absorption bands of the higher atmosphere layers; and so on; so that the total LWIR emission from the earth should then be a composite of roughly BB spectra but with source temepratures ranging ove the entire surface Temeprature range, as well as the range of atmospheric emitting Temperatures.

Bill Gray has a favorite diagram, taken from a 1985 climate model, showing little nodules in the center with such labels as «thermal inertia» and «net energy balance» and «latent heat flux» and «subsurface heat storage» and «absorbed heat radiation» and so on, and they are emitting arrows that curve and loop in all directions, bumping into yet more jargon, like «soil moisture» and «surface roughness» and «vertical wind» and «meltwater» and «volcanoes.»

Thus, long - term variations of TSI (with account for their direct and secondary, based on feedback effects, influence) are the main fundamental cause of climate changes since variations of the Earth climate is mainly determined by a long - term imbalance between the energy of solar radiation entering the upper layers of the Earth's atmosphere and the total energy emitted from the Earth back to space.»

Every portion of the Earth's surface emits radiation continuously, dependent on the temperature and emissivity.

The kind of radiation emitted depends on the temperature (the higher the temperature the shorter the wavelength).

As a matter of fact the radiation flow from the surface absorbed by the air is within a few percent equal to the radiation of the air impinging on the surface: that is very different of the greenhouse glass panel in the vacuum that absorbs all of the thermal infrared radiation from the surface and emits half of it upwards and half of it downwards back to the surface.

carrot Eater wrote that some are apt to forget that anything above absolute zero emits radiation — well yes it does, because its losing heat, but depends on the temperature surrouding it.

The Sun's radiation transports, or emits, short - wave electro - magnetic radiation away and thus avoids «a big bang» --(There may also be back radiation from planets etc. provided the radiative forces are strong enough to reach the Sun) On a smaller scale the same «Energy Transport System» or radiative principles work here on Earth toOn a smaller scale the same «Energy Transport System» or radiative principles work here on Earth toon Earth too.

The total radiation leaving one side of the layer is the external radiation reflected back by the interface, radiation emitted internally by the layer and transmitted through the interface, radiation scattered by sites inside the layer and transmitted through the interface, and radiation transmitted through the layer from the surroundings on the opposite side.

29 21.3 Climate Changes Human Impact on Climate Changes The Greenhouse Effect • The greenhouse effect is a natural warming of both Earth's lower atmosphere and Earth's surface from solar radiation being absorbed and emitted by the atmosphere.