153 research outputs found
A Quasi-Classical Model for VT and VV Rate Constants
Projet M3NWe present in this report vibrational rate constants for VT and VV process in a pure diatomic gas, based on the quasi-classical theory. Different approximations are derived for moderate temperatures flows. Numerical results are proposed for diatomic nitrogen (), and compared with Adamovich et als and Billing-Fisher models
Weighted norm inequalities for Fourier transforms of radial functions
"Vegeu el resum a l'inici del document del fitxer adjunt"
Non-minimally Coupled Cosmological Models with the Higgs-like Potentials and Negative Cosmological Constant
We study dynamics of non-minimally coupled scalar field cosmological models
with Higgs-like potentials and a negative cosmological constant. In these
models the inflationary stage of the Universe evolution changes into a
quasi-cyclic stage of the Universe evolution with oscillation behaviour of the
Hubble parameter from positive to negative values. Depending on the initial
conditions the Hubble parameter can perform either one or several cycles before
to become negative forever.Comment: 22 pages, 6 figures, v4:Section 2 expanded, references added,
accepted for publication in Class. Quant. Gra
Measurement of the Pion Form Factor in the Energy Range 1.04-1.38 GeV with the CMD-2 Detector
The cross section for the process is measured in the
c.m. energy range 1.04-1.38 GeV from 995 000 selected collinear events
including 860000 events, 82000 events, and 33000
events. The systematic and statistical errors of measuring the
pion form factor are equal to 1.2-4.2 and 5-13%, respectively.Comment: 5 pages, 2 figure
ВНУТРИГОСПИТАЛЬНАЯ ТРАНСПОРТИРОВКА ПАЦИЕНТОВ С РАЗРЫВОМ АРТЕРИАЛЬНЫХ АНЕВРИЗМ ГОЛОВНОГО МОЗГА
Goal: to evaluate cerebral hemodynamics in the patients with aneurysm rupture during their transportation within the hospital. Materials and methods. 60 patients divided into 2 groups were included into the study. Patients from group 1 were transported as it was traditionally adopted in the clinic; additional sedation and continuous administration of nimodipine were used in group 2. Results. The increase of medium blood velocity in cerebral vessels by 23.5% on the operated side was observed in group 1. Continuous administration nimodipine solution during all transport stages allows reducing the velocity increase in cerebral vessels on the operated side down to 4.5%. Conclusion. The increase of cerebral angiospasm was observed during intrahospital transportation. The need for additional sedation has been justified for the patients transported while being on the artificial pulmonary ventilation. Цель: оценить церебральную гемодинамику у пациентов с разрывом аневризм при внутрибольничной транспортировке. Материалы и методы. Проведено исследование у 60 пациентов, разделенных на две группы. Больные 1-й группы транспортированы по принятой в клинике методике, а 2-й − с применением дополнительной седации и непрерывным введением нимодипина. Результаты. Отмечено нарастание средних скоростей по церебральным сосудам на 23,5% на стороне оперативного вмешательства в 1-й группе. Применение непрерывного введения раствора нимодипина на всех этапах транспортировки позволяет снизить повышение скорости по церебральным сосудам на стороне хирургического вмешательства до 4,5%. Заключение. Выявлено повышение показателей церебрального ангиоспазма при внутригоспитальной транспортировке. Обоснована необходимость применения дополнительной седации у пациентов, транспортируемых с применением искусственной вентиляции легких.
Measurement of the solar neutrino capture rate with gallium metal
The solar neutrino capture rate measured by the Russian-American Gallium
Experiment (SAGE) on metallic gallium during the period January 1990 through
December 1997 is 67.2 (+7.2-7.0) (+3.5-3.0) SNU, where the uncertainties are
statistical and systematic, respectively. This represents only about half of
the predicted Standard Solar Model rate of 129 SNU. All the experimental
procedures, including extraction of germanium from gallium, counting of 71Ge,
and data analysis are discussed in detail.Comment: 34 pages including 14 figures, Revtex, slightly shortene
Results from the Baksan Experiment on Sterile Transitions (BEST)
The Baksan Experiment on Sterile Transitions (BEST) was designed to
investigate the deficit of electron neutrinos, , observed in previous
gallium-based radiochemical measurements with high-intensity neutrino sources,
commonly referred to as the \textit{gallium anomaly}, which could be
interpreted as evidence for oscillations between and sterile neutrino
() states. A 3.414-MCi \nuc{51}{Cr} source was placed at the
center of two nested Ga volumes and measurements were made of the production of
\nuc{71}{Ge} through the charged current reaction,
\nuc{71}{Ga}(,e)\nuc{71}{Ge}, at two average distances. The measured
production rates for the inner and the outer targets respectively are
(54.9^{+2.5}_{-2.4}(\mbox{stat})\pm1.4 (\mbox{syst})) and
(55.6^{+2.7}_{-2.6}(\mbox{stat})\pm1.4 (\mbox{syst})) atoms of
\nuc{71}{Ge}/d. The ratio () of the measured rate of \nuc{71}{Ge} production
at each distance to the expected rate from the known cross section and
experimental efficiencies are and .
The ratio of the outer to the inner result is 0.970.07, which is
consistent with unity within uncertainty. The rates at each distance were found
to be similar, but 20-24\% lower than expected, thus reaffirming the anomaly.
These results are consistent with oscillations with a
relatively large (0.5 eV) and mixing sin
(0.4).Comment: Paper updated to final versio
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