نتایج جستجو برای: mean earth density
تعداد نتایج: 1049485 فیلتر نتایج به سال:
We estimate in this paper the errors in the zenith angle distribution for the charged current events of the solar neutrinos caused by the uncertainty of the earth electron density. In the model of PREM with a 5% uncertainty in the earth electron density we numerically calculate the corrections to the correlation between [N ]5/[N ]2 and [N ]2/[N ]3, and find the errors notable. Forthcoming resul...
We present a novel scenario where a scalar field acquires a mass which depends on the local matter density: the field is massive on Earth, where the density is high, but is essentially free in the solar system, where the density is low. All existing tests of gravity are satisfied. We predict that near-future satellite experiments could measure an effective Newton's constant in space different f...
We perform a systematic study of the enhancement of the transitions ν µ (ν e) → ν e (ν µ;τ), ν 2 → ν e , ¯ ν µ → ¯ ν s , ν e → ν s , etc. of neutrinos passing through a medium of nonperiodic density distribution, consisting of i) two layers of different constant densities (e.g., Earth core and mantle), or ii) three layers of constant density with the first and the third layers having identical ...
Solar electron beams responsible for type III radio emission generate Langmuir waves as they propagate out from the Sun. The Langmuir waves are observed via in-situ electric field measurements. These Langmuir waves are not smoothly distributed but occur in discrete clumps, commonly attributed to the turbulent nature of the solar wind electron density. Exactly how the density turbulence modulate...
We have investigated past measurements of the local supermassive black hole mass density, correcting for hitherto unknown dependencies on the Hubble constant, which, in some cases, had led to an underestimation of the mass density by factors of ∼2. Correcting for this, we note that the majority of (but not all) past studies yield a local supermassive black hole mass density that is consistent w...
Step function approximations of the Earth matter density profile have been used by several authors, see e.g. Refs. [1,2], for the analysis of matter effects in neutrino oscillation experiments. In order to investigate the quality of this approximation, we have developed methods to numerically calculate the transition probability amplitudes in a realistic matter density profile. Calculations wer...
one of the difficulties in using absolute altitudes is the separation between the mean open sealevel and geoid. theoretically, geoid is the base level in absolute altitudes, but practically, the mean open sealevel is used as a base level for absolute altitudes. the difference between these two levels is called as the seasurface topography. in this research, it is dealt the mean sea level modeli...
As there is minimal gravitational force in space, muscles and bones are not loaded as they normally are on earth. Cosmonauts (and astronauts) in space lose their muscular strength very quickly (muscle atrophy), which is why they are not able to easily walk when they come back to earth. The decrease of bone density increases the risk of bone fractures, so it's not safe to stay in space for exten...
We report phonon densities of states (DOS) of iron measured by nuclear resonant inelastic x-ray scattering to 153 gigapascals and calculated from ab initio theory. Qualitatively, they are in agreement, but the theory predicts density at higher energies. From the DOS, we derive elastic and thermodynamic parameters of iron, including shear modulus, compressional and shear velocities, heat capacit...
In recent years, oak trees in the Zagros forests have suffered a lot of fatalities for unclear reasons. Determining the rate and severity of forest crown density changes is important for the investigation and management of these forests. This research was carried out with the aim of determining the amount of crown cover changes in the forest area of Dashtebarm in Fars province under the influen...
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