52 research outputs found
Dynamical Fermion Masses Under the Influence of Kaluza-Klein Fermions and a Bulk Abelian Gauge Field
The dynamical fermion mass generation on a 3-brane in the 5D space-time is
discussed in a model with bulk fermions in interaction with fermions on the
brane assuming the presence of a constant abelian gauge field component
in the bulk. We calculate the effective potential as a function of the fermion
masses and the gauge field component . The masses can be found from the
stationarity condition for the effective potential (the gap equation). We
formulate the equation for the mass spectrum of the 4D--fermions. The phases
with finite and vanishing fermion masses are studied and the dependence of the
masses on the radius of the 5th dimension is analyzed. The influence of the
-component of the gauge field on the symmetry breaking is considered both
when this field is a background parameter and a dynamical variable. The
critical values of the field, the coupling constant and the radius are
examined.Comment: 9 pages, 4 figure
Color superconductivity in the static Einstein Universe
We study the behavior of quark and diquark condensates in dense quark matter
under the influence of a gravitational field adopting as a simple model the
static dimensional Einstein Universe. Calculations are performed in the
framework of the extended Nambu--Jona-Lasinio model at finite temperature and
quark density on the basis of the thermodynamic potential and the gap
equations. Quark and diquark condensates as functions of the chemical potential
and temperature at different values of the curvature have been studied. Phase
portraits of the system have been constructed
Gravitational catalysis of chiral and color symmetry breaking of quark matter in hyperbolic space
We study the dynamical breaking of chiral and color symmetries of dense quark
matter in the ultrastatic hyperbolic spacetime in the framework
of an extended Nambu--Jona-Lasinio model. On the basis of analytical
expressions for chiral and color condensates as functions of curvature and
temperature, the phenomenon of dimensional reduction and gravitational
catalysis of symmetry breaking in strong gravitational field is demonstrated in
the regime of weak coupling constants. In the case of strong couplings it is
shown that curvature leads to small corrections to the flat-space values of
condensate and thus enhances the symmetry breaking effects. Finally, using
numerical calculations phase transitions under the influence of chemical
potential and negative curvature are considered and the phase portrait of the
system is constructed.Comment: 14 pages, 5 figure
Insufficiency of timeliness and efficiency of diagnosis of malignant tumors of visual localization in the female reproductive system
Reproductive system cancer is the most common female malignancy, accounting for 36.1 to 37.6 % of all gynecological cancers. The incidence rate of female reproductive system cancer continues to increase. Material and methods. The study was conducted in 2018 by interviewing 391 patients with breast cancer, 273 patients with cervical cancer, 30 patients with cancer of the vulva and 11 patients with vaginal cancer were interviewed. Results. The time period for making diagnosis lasted no longer than a week in 2.0 % of respondents with breast cancer, 5.9 % with vaginal tumor and 11.3 % with cervical cancer. A long period of cancer detection was the cause of advanced cancer (56.5 and 47.0 % of cases of breast and cervical cancer, 40.0 % of vulva and 11.6 % of vaginal cancer). Discussion. The majority of district oncologists and other allied healthcare professionals are not able to identify abnormalities caused by cancer. Physicians of municipal health care facilities are either completely unaware of the procedure for routing patients with suspected malignant neoplasm or simply cannot explain it to patients. Conclusions. Oncologists working in outpatient health care facilities and other allied healthcare professionals need a special methodical literature on cancer screening. It is necessary to optimize the routing scheme of patients with suspected malignant tumors with mandatory training of oncologists and other allied healthcare professionals on the routing of such patients
Finite size effects in the Gross-Neveu model with isospin chemical potential
The properties of the two-flavored Gross-Neveu model in the (1+1)-dimensional
spacetime with compactified space coordinate are investigated
in the presence of the isospin chemical potential . The consideration is
performed in the limit , i.e. in the case with infinite number of
colored quarks. It is shown that at ( is the length of the
circumference ) the pion condensation phase is realized for arbitrary
small nonzero . At finite values of , the phase portraits of the
model in terms of parameters and are obtained
both for periodic and antiperiodic boundary conditions of the quark field. It
turns out that in the plane there is a strip
which lies as a whole inside the pion condensed phase.
In this phase the pion condensation gap is an oscillating function vs both
(at fixed ) and (at fixed ).Comment: 12 pages, 8 figures; one reference added; accepted for publication in
PR
Main directions of detection of malignant neoplasms of leading localizations in rural municipal districts
Study objective was the identification of the main reasons of the high level of neglect of cancer of the leading localizations among residents of rural municipalities of the Chelyabinsk region.Цель работы — установить основные причины высокого уровня запущенности ЗНО ведущих локализаций у жителей сельских муниципальных образований Челябинской област
Studies of the Response of the Prototype CMS Hadron Calorimeter, Including Magnetic Field Effects, to Pion, Electron, and Muon Beams
We report on the response of a prototype CMS hadron calorimeter module to
charged particle beams of pions, muons, and electrons with momenta up to 375
GeV/c. The data were taken at the H2 and H4 beamlines at CERN in 1995 and 1996.
The prototype sampling calorimeter used copper absorber plates and scintillator
tiles with wavelength shifting fibers for readout. The effects of a magnetic
field of up to 3 Tesla on the response of the calorimeter to muons, electrons,
and pions are presented, and the effects of an upstream lead tungstate crystal
electromagnetic calorimeter on the linearity and energy resolution of the
combined calorimetric system to hadrons are evaluated. The results are compared
with Monte Carlo simulations and are used to optimize the choice of total
absorber depth, sampling frequency, and longitudinal readout segmentation.Comment: 89 pages, 41 figures, to be published in NIM, corresponding author: P
de Barbaro, [email protected]
Outlier detection and classification in sensor data streams for proactive decision support systems
A paper has a deal with the problem of quality assessment in sensor data streams accumulated by proactive decision support systems. The new problem is stated where outliers need to be detected and to be classified according to their nature of origin. There are two types of outliers defined; the first type is about misoperations of a system and the second type is caused by changes in the observed system behavior due to inner and external influences. The proposed method is based on the data-driven forecast approach to predict the values in the incoming data stream at the expected time. This method includes the forecasting model and the clustering model. The forecasting model predicts a value in the incoming data stream at the expected time to find the deviation between a real observed value and a predicted one. The clustering method is used for taxonomic classification of outliers. Constructive neural networks models (CoNNS) and evolving connectionists systems (ECS) are used for prediction of sensors data. There are two real world tasks are used as case studies. The maximal values of accuracy are 0.992 and 0.974, and F1 scores are 0.967 and 0.938, respectively, for the first and the second tasks. The conclusion contains findings how to apply the proposed method in proactive decision support systems
RD46 status report: high resolution tracking devices based on capillaries filled with liquid scintillator
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