45 research outputs found
Fukushima plutonium effect and blow-up regimes in neutron-multiplying media
It is shown that the capture and fission cross-sections of 238U and 239Pu
increase with temperature within 1000-3000 K range, in contrast to those of
235U, that under certain conditions may lead to the so-called blow-up modes,
stimulating the anomalous neutron flux and nuclear fuel temperature growth.
Some features of the blow-up regimes in neutron-multiplying media are
discussed.Comment: 15 pages, 8 figures. (v2: numerous corrections and style
improvements). arXiv admin note: substantial text overlap with
arXiv:1207.369
On some fundamental peculiarities of the traveling wave reactor
On the basis of the condition for nuclear burning wave existence in the
neutron-multiplicating media (U-Pu and Th-U cycles) we show the possibility of
surmounting the so-called dpa-parameter problem, and suggest an algorithm of
the optimal nuclear burning wave mode adjustment, which is supposed to yield
the wave parameters (fluence/neutron flux, width and speed of nuclear burning
wave) that satisfy the dpa-condition associated with the tolerable level of the
reactor materials radioactive stability, in particular that of the cladding
materials.
It is shown for the first time that the capture and fission cross-sections of
U and Pu increase with temperature within 1000-3000K range,
which under certain conditions may lead to a global loss of the nuclear burning
wave stability. Some variants of the possible stability loss due to the
so-called blow-up modes (anomalous nuclear fuel temperature and neutron flow
evolution) are discussed and are found to possibly become a reason for a
trivial violation of the traveling wave reactor internal safety.Comment: 44 pages, 19 figures, 2 table
Mechanism of Deep-focus Earthquakes Anomalous Statistics
Analyzing the NEIC-data we have shown that the spatial deep-focus earthquake
distribution in the Earth interior over the 1993-2006 is characterized by the
clearly defined periodical fine discrete structure with period L=50 km, which
is solely generated by earthquakes with magnitude M 3.9 to 5.3 and only on the
convergent boundary of plates. To describe the formation of this structure we
used the model of complex systems by A. Volynskii and S. Bazhenov. The key
property of this model consists in the presence of a rigid coating on a soft
substratum. It is shown that in subduction processes the role of a rigid
coating plays the slab substance (lithosphere) and the upper mantle acts as a
soft substratum. Within the framework of this model we have obtained the
estimation of average values of stress in the upper mantle and Young's modulus
for the oceanic slab (lithosphere) and upper mantle.Comment: 9 pages, 7 figure
KamLAND-experiment and Soliton-like Nuclear Georeactor. Part 1. Comparison of Theory with Experiment
We give an alternative description of the data produced in the KamLAND
experiment, assuming the existence of a natural nuclear reactor on the boundary
of the liquid and solid phases of the Earth's core. Analyzing the uncertainty
of antineutrino spectrum of georeactor origin, we show that the theoretical
(which takes into account the soliton-like nuclear georeactor) total reactor
antineutrino spectra describe with good accuracy the experimental KamLAND-data
over the years of 2002-2007 and 2002-2009, respectively. At the same time the
parameters of mixing ({\Delta}(m21)^2=2.5\cdot 10^-5 eV^2,
tan^2{\theta}12=0.437) calculated within the framework of georeactor hypothesis
substantially differ from the parameters of mixing ({\Delta}(m21)^2=7.49\cdot
10^-5 eV^2, tan^2{\theta}12=0.436) obtained in KamLAND-experiment for total
exposure over the period of 2002-2009. By traingulation of KamLAND and Borexino
data we have constructed the coordinate location of soliton-like nuclear
georeactors on the boundary of the liquid and solid phases of the Earth core.
Based on the necessary condition of full synchronization of geological
(magnetic) time scale and time evolution of heat power of nuclear georeactor,
which plays the role of energy source of the Earth magnetic field, and also the
strong negative correlation between magnetic field of the solar tachocline zone
and magnetic field of the Earth liquid core (Y-component) we have obtain the
estimation of nuclear georeactor average heat power ~30 TW over the years
2002-2009.Comment: 50 pages; 17 figures; 1 table. A substantially revised, corrected and
enhanced editio
ОТНОШЕНИЕ НАСЕЛЕНИЯ ТЮМЕНСКОЙ ОБЛАСТИ К ПОСЛЕДСТВИЯМ ПРОВЕДЕНИЯ МИРНОГО ЯДЕРНОГО ВЗРЫВА «ТАВДА»
The research of radiation-hygienic situation of the region neighboring the place of peaceful nuclear explosion «Tavda» showed the absence of the release of radionuclides to the surface. There were no any publications in local massmedia for the last 5 years. The most of the respondents are not aware of this explosion. They don’t show symptoms of radio anxiety about possible consequences of this explosion. The respondents are interested in information about possible influence of radiation on their health and protective measures from radiation. The adequate Recommendations have been developed for Federal Service for Surveillance on Consumer Rights protection and Human Well-being.В результате изучения радиационно-гигиенической обстановки в месте проведения мирного ядерного взрыва «Тавда» в Тюменской области установлено отсутствие выхода радионуклидов на поверхность. Изучение информированности населения об этом взрыве показало, что за последние 5 лет какие-либо публикации об этом взрыве в местных СМИ отсутствуют, а подавляющее большинство респондентов не знает о таком событии. Анкетирование групп населения вблизи места взрыва оказало, что у респондентов нет признаков выраженной радиотревожности по поводу возможных последствий взрыва. При низком уровне радиационно-гигиенических знаний опрошенные выразили интерес к получению сведений о влиянии радиации на здоровье и о мерах защиты от радиации. Для сотрудников органов Роспотребнадзора разработаны рекомендации по методам информационной работы с населением
Clinical features of the course of juvenile arthritis in children
The article presents the data of a retrospective study of children n=21, with a confirmed diagnosis of juvenile rheumatoid arthritis. The authors compare the features of the clinic and the course of poly-and oligoarticular variants of arthritis. The results of the study revealed the features of the course of arthritis, depending on the type of joint damageВ статье представлены данные ретроспективного исследования детей (n=21) с подтвержденным диагнозом ювенильного ревматоидного артрита. Авторы сравнивают особенности клиники и течения поли- и олигоартикулярного вариантов артрита. По результатам исследования выявлены особенности течения артрита в зависимости от типа поражения суставо