An optical guide, which is a light guide located between NaI(Tl) scintillation-crystal and array of photo-multiplier tubes (PMTs) in the gamma camera detector system, is an essential component to deliver the spatial information recorded in scintillator to the PMTs. Without the optical guide, the spatial information within the range of a single PMT could not be obtained. For the design of the op...

Cognitive impairment is consistently reported in children treated for brain tumors, particularly in the categories of processing speed, memory, and attention. Although tumor site, hydrocephalus, chemotherapy, and cranial radiation therapy (CRT) are all associated with poorer function, CRT predicts the greatest deficits. There is a particularly high correlation between CRT and slowed information...

Intracerebral recordings of neuronal activity in patients undergoing deep brain stimulation have revealed characteristic movement-related desynchronization at frequencies <30 Hz and increased activity in the gamma band (~30-100 Hz) in the basal ganglia and thalamus. Thalamic gamma activity is also found during arousal. Here, we explore oscillatory gamma band activity recorded from the ventralis...

Gamma irradiation is one of the most important physical mutagen used for inducing beneficial as well as harmful cytogenetic effects in many crop plants. The cytogenetic changes occurring due to the storage of Lathyrus sativus L. seeds after gamma irradiation were examined during the present study. Mitotic index showed a dose dependant decrease while the dose and duration of treatments increased...

This paper describes a new approach to adapted estimation of parametric mixture model based on diagonal of the modified Riesz distribution (DMRD) defined in R , r ≥ 2. The DMRD can model accurately a withe variety of color image. This parameters index a family of distribution witch include the bivariate Gamma and the convolution product between bivariate Gamma and univariate Gamma. In our work,...

BL Lacertae was detected by the EGRET instrument on CGRO at the 10.2 σ level with an average flux of 171 ± 42 × 10 photons cms at energies > 100 MeV during the optical outburst of 1997 July. This flux is more than 4 times the previously highest level. Within the July 15-22 observation there was a dramatic factor of 2.5 increase in the gamma-ray flux on July 18.75–19.08, apparently preceding by ...

This paper answers a basic question about the Birman exact sequence in theory of mapping class groups. We prove that does not admit section over any subgroup $\Gamma$ contained Torelli group with finite index. A fortiori this proves there is no for finite-index full group. theorem was announced 1990 preprint G. Mess, but an error uncovered and described recent first author.

background: radioprotective effect of famotidine was previously shown on radiation induced micronuclei and chromosomal aberrations in human peripheral lymphocytes and mouse bone marrow cells however, its radioprotective property has never been studied in mouse spermatogenesis. it was also shown that vitamin c as an antioxidant also exert its radioprotective effect on many biological systems, bu...

We obtained new upper limits on the diffuse gamma rays from the inner Galactic (IG) and outer Galactic (OG) planes in 3-10 TeV region, using the Tibet air shower data and new Monte Carlo simulation results. A difference of the effective area of the air-shower array for observing gamma rays and cosmic rays was carefully taken into account in this analysis, resulting in that the flux upper limits...