The anisotropic field dependence of the Sommerfeld coefficient gamma has been measured down to B-->0 by combining specific heat and Hall probe magnetization measurements in MgB2 single crystals. We find that gamma(B,theta) is the sum of two contributions arising from the sigma and pi band, respectively. We show that gammasigma(B,theta)=B/Bc2(theta) where Bc2(theta)=Bc2ab/sqrt[sin2theta+Gamma2co...

Approximately 90 contributions to the 5th Heidelberg Symposium on High-Energy Gamma-Ray Astronomy (Gamma 2012), presented new results and ideas in the general field of extragalactic high-energy gamma-ray astronomy. The largest contingent of contributions in this field related to active galactic nuclei (AGN), including blazars, radio galaxies, and Narrow-Line Seyfert 1 (NLSy1) galaxies. Also, ne...

Recent observations have confirmed that Gamma-Ray Burst (GRB) afterglows produce Very High-Energy radiation (VHE, E>100GeV). This highly anticipated discovery opens new scenarios in the interpretation of GRBs and their role as probes Extragalactic Background Light (EBL) Lorentz Invariance Violation (LIV). However, some fundamental questions about actual nature VHE emission its evolution duri...

Quantitative assessment of local field potentials by means of Fast Fourier Transformation (FFT) results in the so-called power density spectrum. Within this spectrum particular frequency ranges are defined in order to relate these to behavior. Frequencies above 35 Hz are generally labeled as gamma oscillations, especially as low gamma (40 55 Hz) or high gamma (70 100 Hz). In order to learn more...

Gamma frequency (30-80 Hz) oscillations are recordable from human and rodent entorhinal cortex. A number of mechanisms used by neuronal networks to generate such oscillations in the hippocampus have been characterized. However, it is as yet unclear as to whether these mechanisms apply to other anatomically disparate brain regions. Here we show that the medial entorhinal cortex (mEC) in isolatio...

The aim of this study was to demonstrate how dosimetry with an amorphous silicon electronic portal imaging device (a-Si EPID) replaced film and ionization chamber measurements for routine pre-treatment dosimetry in our clinic. Furthermore, we described how EPID dosimetry was used to solve a clinical problem. IMRT prostate plans were delivered to a homogeneous slab phantom. EPID transit images w...

The antiferromagnetic quantum Ising chain has a critical point which belongs to the universality class of transverse model (TIM). When longitudinal field ($h$) is switched on, phase transition preserved, turns first-order for $h/\Gamma \to \infty$, $\Gamma$ being strength field. Here we will re-examine properties along line. During block renormalization group calculation, TIM fixed $h/\Gamma>0$...

High-gamma activity, ranging in frequency between ∼60 Hz and 200 Hz, has been observed in local field potential, electrocorticography, EEG and magnetoencephalography signals during cortical activation, in a variety of functional brain systems. The origin of these signals is yet unknown. Using computational modeling, we show that a cortical network model receiving thalamic input generates high-g...