282 research outputs found
А. А. КУЛЯБКО – ВЫДАЮЩИЙСЯ РУССКИЙ ФИЗИОЛОГ (К 150-ЛЕТИЮ СО ДНЯ РОЖДЕНИЯ)
The article is dedicated to the outstanding Russian physiologist, pet of the Medical Faculty of the Tomsk Imperial University Kulyabko Alexei Alexandrovich, who was the first in the world who on the second of August 1902 revived the human heart after 20 hours after the child’s death which was caused by pneumonia. The were characterized the basic stages of life of this world famous physiologist, his teachers and colleagues, analyzed his scientific and pedagogical activity, revealed the significance of his scientific discoveries for modern intensive care, cardiac surgery and transplantation. Статья посвящена выдающемуся русскому физиологу, питомцу медицинского факультета Императорского Томского университета Алексею Александровичу Кулябко, который впервые в мире 2 августа 1902 г. оживил человеческое сердце спустя 20 ч после смерти ребенка, наступившей от воспаления легких. Охарактеризованы основные этапы жизненного пути всемирно известного физиолога, его учителя и коллеги, проанализирована его научно-педагогическая деятельность, выявлено значение его научных открытий для современной реаниматологии, кардиохирургии и трансплантологии.
Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions
The HERA-B collaboration has studied the production of charmonium and open
charm states in collisions of 920 GeV protons with wire targets of different
materials. The acceptance of the HERA-B spectrometer covers negative values of
xF up to xF=-0.3 and a broad range in transverse momentum from 0.0 to 4.8
GeV/c. The studies presented in this paper include J/psi differential
distributions and the suppression of J/psi production in nuclear media.
Furthermore, production cross sections and cross section ratios for open charm
mesons are discussed.Comment: 5 pages, 9 figures, to be published in the proceedings of the 6th
International Conference on Hyperons, Charm & Beauty Hadrons (BEACH04),
Chicago, IL, June 27 - July 3, 200
Даниил Исаакович Гольдберг (1906—1973). К 100-летию со дня рождения
2006 is the 100th anniversary of the great Russian scientist-pathophysiologist, outstanding representativeof the Tomsk school of pathophysiologists, honoured scientist of Russia, professor of the Tomsk Medical Institute Daniil Assakovich Goldberg (1906—1973). Creative biography of the scientist and main directions of his scientific activity are described in the article.В 2006 г. исполняется 100 лет со дня рождения крупного российского ученого-патофизиолога, выдающегося представителя томской школы патофизиологов, заслуженного деятеля науки РСФСР, профессора Томского медицинского института Даниила Исааковича Гольдберга (1906—1973). Описана творческая биография ученого. Отражены основные направления его научной деятельности
Search for the Flavor-Changing Neutral Current Decay with the HERA-B Detector
We report on a search for the flavor-changing neutral current decay using events recorded with a dimuon trigger in
interactions of 920 GeV protons with nuclei by the HERA-B experiment. We find
no evidence for such decays and set a 90% confidence level upper limit on the
branching fraction .Comment: 17 pages, 4 figures (of which 1 double), paper to be submitted to
Physics Letters
Measurement of the J/Psi Production Cross Section in 920 GeV/c Fixed-Target Proton-Nucleus Interactions
The mid-rapidity (dsigma_(pN)/dy at y=0) and total sigma_(pN) production
cross sections of J/Psi mesons are measured in proton-nucleus interactions.
Data collected by the HERA-B experiment in interactions of 920 GeV/c protons
with carbon, titanium and tungsten targets are used for this analysis. The
J/Psi mesons are reconstructed by their decay into lepton pairs. The total
production cross section obtained is sigma_(pN)(J/Psi) = 663 +- 74 +- 46
nb/nucleon. In addition, our result is compared with previous measurements
Inclusive Production Cross Sections from 920 GeV Fixed Target Proton-Nucleus Collisions
Inclusive differential cross sections and
for the production of \kzeros, \lambdazero, and
\antilambda particles are measured at HERA in proton-induced reactions on C,
Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to
GeV in the proton-nucleon system. The ratios of differential
cross sections \rklpa and \rllpa are measured to be and , respectively, for \xf . No significant dependence upon the
target material is observed. Within errors, the slopes of the transverse
momentum distributions also show no significant
dependence upon the target material. The dependence of the extrapolated total
cross sections on the atomic mass of the target material is
discussed, and the deduced cross sections per nucleon are
compared with results obtained at other energies.Comment: 17 pages, 7 figures, 5 table
Energy Flow in the Hadronic Final State of Diffractive and Non-Diffractive Deep-Inelastic Scattering at HERA
An investigation of the hadronic final state in diffractive and
non--diffractive deep--inelastic electron--proton scattering at HERA is
presented, where diffractive data are selected experimentally by demanding a
large gap in pseudo --rapidity around the proton remnant direction. The
transverse energy flow in the hadronic final state is evaluated using a set of
estimators which quantify topological properties. Using available Monte Carlo
QCD calculations, it is demonstrated that the final state in diffractive DIS
exhibits the features expected if the interaction is interpreted as the
scattering of an electron off a current quark with associated effects of
perturbative QCD. A model in which deep--inelastic diffraction is taken to be
the exchange of a pomeron with partonic structure is found to reproduce the
measurements well. Models for deep--inelastic scattering, in which a
sizeable diffractive contribution is present because of non--perturbative
effects in the production of the hadronic final state, reproduce the general
tendencies of the data but in all give a worse description.Comment: 22 pages, latex, 6 Figures appended as uuencoded fil
A Search for Selectrons and Squarks at HERA
Data from electron-proton collisions at a center-of-mass energy of 300 GeV
are used for a search for selectrons and squarks within the framework of the
minimal supersymmetric model. The decays of selectrons and squarks into the
lightest supersymmetric particle lead to final states with an electron and
hadrons accompanied by large missing energy and transverse momentum. No signal
is found and new bounds on the existence of these particles are derived. At 95%
confidence level the excluded region extends to 65 GeV for selectron and squark
masses, and to 40 GeV for the mass of the lightest supersymmetric particle.Comment: 13 pages, latex, 6 Figure
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