Neutrino self-polarization effect in matter

The quasi-classical theory of the spin light of neutrino ($SL\nu$) in background matter, accounting for the neutrino polarization, is developed. The neutrino transitions $\nu_{L}\to \nu_{R}$ and $\nu_{R}\to \nu_{L}$ rates in matter are calculated. It is shown that the $SL\nu$ in matter leads to the neutrino conversion from active $\nu_{L}$ to sterile $\nu_{R}$ states (neutrino self-polarization effect in matter).Comment: LaTex 9 pages, no figure

Statistical evaluation of the effect of hygrothermal aging on the interlaminar shear of GFRP

Изучение закономерностей изменения свойств, накопления повреждений и разрушения конструкционных композитов после гигротермического старения представляет собой актуальное и важное направление. В работе представлены результаты механических испытаний на межслойный сдвиг образцов электротехнического конструкционного стеклопластика и эпоксидного композита до и после предварительного гигротермического старения в рабочих средах (техническая вода, морская вода, машинное масло) различной продолжительности (15, 30 и 45 суток. ) и различных температур (22, 60 и 90ºС). Результаты испытаний были использованы для статистической оценки значимости немонотонных изменений прочности в случае межслойного сдвига после предварительного гигротермического старения относительно номинального материала с использованием ANCOVA и регрессионного анализа. Такие методы показали, что морские и технологические водные растворы отрицательно влияют на прочность на межслойный сдвиг, но их влияние было немного различным и сильно зависело от эффекта взаимодействия между временем воздействия и температурой раствора. Таким образом, максимальная разница составляет около 15% и 12% после 45 дней внутри технологической и морской воды при температуре 90 ºC соответственно. Напротив, воздействие машинного масла привело к увеличению прочности, но эффект более слабый по сравнению с водными растворами (около 6%)

Does the Borexino experiment have enough resolution to detect the neutrino flavor day-night asymmetry?

The Earth's density distribution can be approximately considered piecewise continuous at the scale of two-flavor oscillations of neutrinos with energies about 1 MeV. This quite general assumption appears to be enough to analytically calculate the day-night asymmetry factor. Using the explicit time averaging procedure, we show that, within the leading-order approximation, this factor is determined by the electron density immediately before the detector, i.e. in the Earth's crust. Within the approximation chosen, the resulting asymmetry factor does not depend either on the properties of the inner Earth's layers or on the substance and the dimensions of the detector. For beryllium neutrinos, we arrive at the asymmetry factor estimation of about $-4 \times 10^{-4}$, which is at least one order of magnitude beyond the present experimental resolution, including that of the Borexino experiment.Comment: 16 pages, 3 figures; Talk given at the 17th International Seminar on High Energy Physics "QUARKS'2012" (Yaroslavl, Russia, June 4-10, 2012); to appear in the Proceedings volum

Mirror-assisted tuning of laser stabilization via self-injection locking to WGM microresonator

Self-injection locking is a dynamic phenomenon which provides passive stabilization of a lasers emission frequency via resonant optical feedback. The stabilization coefficient depends on the level of resonant feedback and quality factor of the external resonant structure creating the feedback. Usually a self-injection locked laser (SIL) involves barely tunable resonant Rayleigh scattering (RRS). In this work we study theoretically a scheme of a SIL to a high-Q microresonator with drop-port coupled mirror, in which optical feedback level is optimally adjusted by the tuning the drop-port mirror coupling. We show that the additional reflector can improve the laser stabilization and power handling efficiency if compared with the classic RRS-based scheme

Traditional nutrition of Indigenous Peoples in the Arctic zone of Western Siberia : challenges and impact on food security and health

The chapter presents traditional nutrition as a part of the traditional culture of the nomadic Indigenous population in the Arctic zone of Western Siberia. Traditional nutrition effectively prevents health problems and enables people to adapt to the harsh climate conditions of the High North. This chapter analyses the implementation of Russian national policies on traditional reindeer herding in this region that is affected by issues of food security and food sovereignty. Export trends of traditional products have decreased local Indigenous Peoples’ access to venison, negatively impacting their health