1,186 research outputs found
Seismic coherence measure in presence of residual trace-to-trace time delay variations
В работе после сопоставительного анализа меры когерентности и предполагаемой модели сейсмической записи предложен новый метод оценки когерентности. Метод обеспечивает большую чувствительность когерентности в присутствии остаточных временных сдвигов после учета локального наклона в окне анализа. Он основан на более реалистичной модели сейсмической записи, которая допускает произвольные вариации амплитуды сигнала, дисперсии помехи и остаточных временных сдвигов. Новый метод апробирован на теоретических и реальных данных.В роботі після порівнювального аналізу міри когерентності та передбачуваної моделі сейсмічного запису запропоновано новий метод оцінки когерентності. Метод забезпечує більшу чутливість когерентності у присутності залишкових часових зсувів після врахування локального нахилу у вікні аналізу. Він ґрунтується на більш реалістичній моделі сейсмічного запису, яка допускає довільні варіації амплітуди сигналу, дисперсії завади та залишкових часових
зсувів. Новій метод апробовано на теоретичних та реальних даних.In the paper after analyzing the relation of coherence to the supposed mathematical model of seismic data, a new method is presented. It makes coherence more sensitive to the presence of residual time delay fluctuations of the signal after removal of its average local dip in the analysis window. The method is based on a more realistic data model that permits arbitrary trace-to-trace variations in signal amplitude, signal time delay and noise variance. The novel method is tested and compared with conventional approaches on synthetic and field data sets
On QCD analysis of stucture function in alternative approach
The alternative approach to QCD analysis of the photon structure function
is presented. It differs from the conventional one by the
presence of the terms which in conventional approach appear in higher orders.
We show that this difference concerns also the photonic parton distribution
functions. In the alternative approach, the complete LO analysis of
can be performed as all required quantities are known. At the
NLO, however, one of the coefficient function is so far not available and thus
only the photonic parton distribution function can be computed and compared to
those of standard approach. We discuss the numerical difference of these
approaches at the LO and the NLO approximation and show that in case of
this difference is non-negligible and may play an important role
in the analysis on photon data of the future experiments.Comment: 25 page
A New 5 Flavour NLO Analysis and Parametrizations of Parton Distributions of the Real Photon
New, radiatively generated, NLO quark (u,d,s,c,b) and gluon densities in a
real, unpolarized photon are presented. We perform three global fits, based on
the NLO DGLAP evolution equations for Q^2>1 GeV^2, to all the available
structure function F_2^gamma(x,Q^2) data. As in our previous LO analysis we
utilize two theoretical approaches. Two models, denoted as FFNS_{CJK}1 & 2 NLO,
adopt the so-called Fixed Flavour-Number Scheme for calculation of the
heavy-quark contributions to F_2^gamma(x,Q^2), the CJK NLO model applies the
ACOT(chi) scheme. We examine the results of our fits by a comparison with the
LEP data for the Q^2 dependence of the F_2^gamma, averaged over various
x-regions, and the F_2,c^gamma. Grid parametrizations of the parton densities
for all fits are provided.Comment: 49 pages, 27 postscript figures; FORTRAN programs available at
http://www.fuw.edu.pl/~pjank/param.htm
Uncertainties of the CJK 5 Flavour LO Parton Distributions in the Real Photon
Radiatively generated, LO quark (u,d,s,c,b) and gluon densities in the real,
unpolarized photon, calculated in the CJK model being an improved realization
of the CJKL approach, have been recently presented. The results were obtained
through a global fit to the experimental F2^gamma data. In this paper we
present, obtained for the very first time in the photon case, an estimate of
the uncertainties of the CJK parton distributions due to the experimental
errors. The analysis is based on the Hessian method which was recently applied
in the proton parton structure analysis. Sets of test parametrizations are
given for the CJK model. They allow for calculation of its best fit parton
distributions along with F2^gamma and for computation of uncertainties of any
physical value depending on the real photon parton densities. We test the
applicability of the approach by comparing uncertainties of example
cross-sections calculated in the Hessian and Lagrange methods. Moreover, we
present a detailed analysis of the chi^2 of the CJK fit and its relation to the
data. We show that large chi^2/DOF of the fit is due to only a few of the
experimental measurements. By excluding them chi^2/DOF approx 1 can be
obtained.Comment: 28 pages, 8 eps figures, 2 Latex figures; FORTRAN programs available
at http://www.fuw.edu.pl/~pjank/param.html; table 10, figure 10 and section 6
correcte
On Tamm's problem in the Vavilov-Cherenkov radiation theory
We analyse the well-known Tamm problem treating the charge motion on a finite
space interval with the velocity exceeding light velocity in medium. By
comparing Tamm's formulae with the exact ones we prove that former do not
properly describe Cherenkov radiation terms. We also investigate Tamm's formula
cos(theta)=1/(beta n) defining the position of maximum of the field strengths
Fourier components for the infinite uniform motion of a charge. Numerical
analysis of the Fourier components of field strengths shows that they have a
pronounced maximum at cos(theta)=1/(beta n) only for the charge motion on the
infinitely small interval. As the latter grows, many maxima appear. For the
charge motion on an infinite interval there is infinite number of maxima of the
same amplitude. The quantum analysis of Tamm's formula leads to the same
results.Comment: 28 pages, 8 figures, to be published in J.Phys.D:Appl.Phy
Hypernuclei as chiral solitons
The identification of flavored multiskyrmions with the ground states of known
hypernuclei is successful for several of them, e.g. for isodoublet H(Lambda) -
He(Lambda), A=4, isoscalars He(Lambda) (A=5) and Li(Lambda) (A=7). In other
cases agreement is not so good, but the behaviour of the binding energy with
increasing baryon number is in qualitative agreement with data. Charmed or
beauty hypernuclei within this approach are predicted to be bound stronger than
strange hypernuclei. This conclusion is stable against variation of poorly
known heavy flavor decay constants.Comment: 9 pages, 1 Fig. Presented at the International Workshops on Nuclear
and Particle Physics at 50-Gev PS, NP01 (KEK, Japan, December 2001) and NP02
(Kyoto, Japan, September 2002). Some additions and corrections of numerical
results are mad
The influence of climatic factors on the course of pregnancy in women of the far north
The article describes the influence of climatic and geographic conditions on the course of pregnancy in women of the Tazovsky district in the far North (Yamalo-Nenets). After analyzing the course of pregnancy on individual cards found that the course of pregnancy has a significant effect on the change in photoperiodicity. In the years of high solar activity, the frequency of complications increases in indigenous and alien residents. In this regard, it is necessary to carry out preventive measures to identify and eliminate complications during pregnancy in all residents of the NorthВ статье рассмотрено влияние климато-географических условий на течение беременности у жительниц Тазовского района Крайнего Севера (ЯНАО). Проанализировав течение беременности по индивидуальным картам установлено, что на течение беременности существенное влияние оказывает изменение фотопериодичности. В годы высокой солнечной активности частота осложнений возрастает у коренных и пришлых жительниц. В связи с этим необходимо проведение профилактических мероприятий по выявлению и устранению осложнений на течение беременности у всех жительниц Север
The influence of climatic factors on the course of pregnancy in women of the far north
The article describes the influence of climatic and geographic conditions on the course of pregnancy in women of the Tazovsky district in the far North (Yamalo-Nenets). After analyzing the course of pregnancy on individual cards found that the course of pregnancy has a significant effect on the change in photoperiodicity. In the years of high solar activity, the frequency of complications increases in indigenous and alien residents. In this regard, it is necessary to carry out preventive measures to identify and eliminate complications during pregnancy in all residents of the NorthВ статье рассмотрено влияние климато-географических условий на течение беременности у жительниц Тазовского района Крайнего Севера (ЯНАО). Проанализировав течение беременности по индивидуальным картам установлено, что на течение беременности существенное влияние оказывает изменение фотопериодичности. В годы высокой солнечной активности частота осложнений возрастает у коренных и пришлых жительниц. В связи с этим необходимо проведение профилактических мероприятий по выявлению и устранению осложнений на течение беременности у всех жительниц Север
Search for charginos in e+e- interactions at sqrt(s) = 189 GeV
An update of the searches for charginos and gravitinos is presented, based on
a data sample corresponding to the 158 pb^{-1} recorded by the DELPHI detector
in 1998, at a centre-of-mass energy of 189 GeV. No evidence for a signal was
found. The lower mass limits are 4-5 GeV/c^2 higher than those obtained at a
centre-of-mass energy of 183 GeV. The (\mu,M_2) MSSM domain excluded by
combining the chargino searches with neutralino searches at the Z resonance
implies a limit on the mass of the lightest neutralino which, for a heavy
sneutrino, is constrained to be above 31.0 GeV/c^2 for tan(beta) \geq 1.Comment: 22 pages, 8 figure
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