14,537 research outputs found
Agenesis of distal segment of right vertebral artery: a case report.
A case is being reported in which the basilar artery was formed only by the left vertebral artery. This was detected incidentally in a female on a non contrast magnetic resonance angiogram. The right vertebral artery arose as a direct branch of the right subclavian artery but terminated blindly at the level of second cervical vertebra. The left vertebral artery which contributed to the formation of basilar artery continued as left posterior cerebral artery while right posterior cerebral artery was seen as a continuation of right posterior communicating artery. The knowledge of variations of the vertebrobasilar arterial complex is important to Clinicians, Radiologists and Surgeons operating on the great vessels and its branches, particularly vascular surgeons dealing with vertebral artery in order to prevent a vascular catastrophe
Neutrino Signal Variation in KamLAND
Large Mixing Angle (LMA) neutrino oscillation is the main solution for the
long-standing Solar Neutrino Problem (SNP). Whether there is any subdominant
effect accompanying the dominant LMA solution can not be ruled out at the
moment, but will be settled by the forthcoming data from highly skilled real
time experiments targeting essentially the low energy domain of solar
neutrinos. Assuming a subdominant effect converting one of the active neutrinos
into a sterile partner in the varying solar field with changing sunspot
activity, we performed field-profile-independent predictions for
neutrino signal variation, which might be tested in the KamLAND's future solar
neutrino detection program. We found that after a substantial reduction of
background and running of KamLAND solar mode through the sunspot maximum period
(around 2010 - 2012), when the solar field at the resonance may vary from few
to , the subdominant time variation effect might be clearly
visible (more than ) for neutrinos.Comment: 12 pages, 4 figures, typos corrected. To appear in JHE
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