During cognitive tasks electrical activity in the brain shows changes in power in specific frequency ranges, such as the alpha (8-12 Hz) or gamma (30-80 Hz) bands, as well as in a broad range above ∼80 Hz, called the high-gamma band. The role or significance of this broadband high-gamma activity is unclear. One hypothesis states that high-gamma oscillations serve just like gamma oscillations, o...

To assess the environmental radioactivity levels and hence to determine the population exposure in Kutubdia Island, Bangladesh the sediment samples were analyzed by using gamma ray spectrometry. In those sediment samples the average activity concentration of natural radionuclides 238U, 232Th and 40K were found 15.39±1.67, 38.35±0.76 and 475.51±21.15 Bq/kg respectively. ...

a reconnaissance study has been made on the distribution of 238u, 232th, 40k, 137cs andgeochemical features in soil and sediment samples at various locations on the coast of bushehr in the persiangulf. in this study a gamma-ray spectrometer based on a high purity germanium detector and a pc basedmca and x-ray fluorescence (xrf) method were used. estimation of the measured radionuclide contentha...

Information retrieval is the selection of documents relevant to a query. Inverted index is the conventional way to store the index of the collection. Because of the large amounts of data, compression techniques are commonly used in information retrieval systems to reduce the size of the inverted index. We experimentally evaluate the result of the mapping of such techniques on the Compressed Spa...

the present paper measures natural radioactivity in different areas of wassit governorate, using (hpge) detector. gamma spectrum analysis for each sample along with caululated specific activity show that the average concentrations of u-238, th-232, and k-40 have been 19.420±4.7 bq/kg, 18.487±5.05 bq/kg, and 204.266±46.9 bq/kg respectively, which is lower than the worldwide average value. while ...

Using the apparatus of correlation Gamma-function (“conditional density”), we have analyzed spatial clustering of objects from several different samples of galaxies, clusters and superclusters. On small scales the distribution of objects obeys a power law drop of density with a power index of 0.9–1.5. On a scale of ∼ 30Mpc for independent samples of bright galaxies and clusters of galaxies we h...

We present a study of the radio environment of the gamma-ray source 3EG J1828+0142. This source presents a very high variability index in its gamma emission and a steep high-energy spectral index Γ ∼ −2.8. Large-scale radio maps at different frequencies show the presence of a shell-type non-thermal structure when the diffuse emission from the Galactic disk is eliminated. At small scales, VLA ra...

Thirteen yr observation data of 4FGL J0824.9+3915 with the Large Area Telescope on board Fermi Gamma Ray Space (Fermi/LAT) are analyzed for revisiting whether 4C +39.23B, a compact steep-spectrum (CSS) source closed to flat-spectrum radio quasar (FSRQ) +39.23A in $\gamma$-ray emitting region J0824.9+3915, is emitter. We find that time-integrated emission overwhelmingly dominated by +39.23A. It ...