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Wyświetlanie 1-15 z 100
Tytuł:
The evolution of correlation functions from low to high pT in PHENIX: from HBT to jets
Autorzy:
Mitchell, J.
Powiązania:
https://bibliotekanauki.pl/articles/148447.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
correlations
jets
Bose-Einstein correlations
relativistic heavy-ion collisions
Opis:
The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a survey of momentum correlations ranging from 200 MeV/c to 7 GeV/c in sNN = 200 GeV p+p, d+Au, Au+Au, and sNN = 62 GeV Au+Au collisions. The correlations are measured separately for like-sign and unlike-sign pairs. Comparisons of the properties of the near-side peak amplitude and width as a function of centrality and transverse momentum for each collision species are presented and discussed.
Źródło:
Nukleonika; 2006, 51,suppl.3; 79-81
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposition of numerical modelling of BEC
Autorzy:
Utyuzh, O.
Wilk, G.
Włodarczyk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/148445.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hadronization
correlations
BEC
Opis:
We propose an extension of the numerical method to model effect of Bose-Einstein correlations (BEC) observed in hadronization processes which allows for calculations not only the correlation functions C2(Qinv) (onedimensional), but also the corresponding C2(Qx,y,z) (i.e., three-dimensional). The method is based on the bunching of identical bosonic particles in elementary emitting cells (EEC) in phase space in a manner leading to proper Bose- Einstein form of distribution of energy (this was enough to calculate C2(Qinv)). To obtain C2(Qx,y,z) as well as one has to add to it the symmetrization of the multiparticle wave function to properly correlate space-time locations of produced particles with their energy-momentum characteristics.
Źródło:
Nukleonika; 2006, 51,suppl.3; 105-108
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to model BEC numerically?
Autorzy:
Utyuzh, O.
Wilk, G.
Włodarczyk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/147372.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
correlations
BEC
HBT
Opis:
A new method for numerical modelling of Bose-Einstein correlations observed in all kinds of multiparticle production processes is proposed.
Źródło:
Nukleonika; 2004, 49,suppl.2; 33-35
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between root and yield related morphological characters in pea (Pisum sativum L.)
Autorzy:
Ciaglo-Androsiuk, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/2199654.pdf
Data publikacji:
2012-08-20
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
canonical correlations
correlations
pea
Pisum sativum
root system
yield
Opis:
Relation between morphological traits  of the root system and yield  related  traits is an important issue concerning efforts aiming at improving of ideotype of cultivated plants species, including pea. In this paper, to analyse the dependency between traits describing the root system morphology and yield potential, Person’s and Spearman's correlations as well as canonical correlations were used. Root system was analyzed in 14 and 21 day-old seedlings growing in blotting-paper cylinders. Yield po- tential of pea was analysed in a field experiment. Results of Person’s and Spearman's correlations revealed that number of lateral roots and lateral roots density were correlated witch yield related traits. Correlation between root length and shoot length was observed only for 14 day-old seedlings. The result of canonical correlations revealed that number of lateral roots and lateral roots density had the largest effect on yield re- lated traits. This work highlights, that in order to improve the yield of pea it might become necessary to under- stand genetic determination of morphological traits of the root system, especially number of lateral roots.
Źródło:
Plant Breeding and Seed Science; 2012, 66; 3-16
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Particle correlations to be seen by ALICE
Autorzy:
Pluta, J.
Chajęcki, Z.
Gos, H.
Skowroński, P.
Powiązania:
https://bibliotekanauki.pl/articles/146388.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ALICE
correlations
HBT
interferometry
Bose-Einstein correlations
quark-gluon plasma
Opis:
The possibilities of ALICE experiment in measurements of particle correlations are estimated by computer simulations. A dedicated software has been created with the aim to study the influence of different experimental factors on the shape of correlation functions and with the intention to serve in the future for the analysis of real data. A scheme of correlation analysis is described shortly and some of the first results are presented. This analysis is being performed in the frame of ALICE "Physics Performance Report".
Źródło:
Nukleonika; 2004, 49,suppl.2; 103-108
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sum rule of the correlation function
Autorzy:
Mrówczyński, S.
Maj, R.
Powiązania:
https://bibliotekanauki.pl/articles/147374.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
particle correlations
nuclear collisions
Opis:
We discuss a sum rule satisfied by the correlation function of two particles with small relative momenta. We first derive the sum rule, which results from the completeness condition of the quantum states of the two particles, and then we discuss it for the case of strongly interacting pair of neutron and proton and for the Coulomb system of two charged particles.
Źródło:
Nukleonika; 2004, 49,suppl.2; 27-31
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of resonances on pion spectra and interferometry volume in relativistic heavy ion collisions
Autorzy:
Akkelin, S.
Borysova, M.
Sinyukov, Y.
Powiązania:
https://bibliotekanauki.pl/articles/146405.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hydrodynamic evolution
HBT correlations
Opis:
The transverse spectra and interferometry volume of thermal pions in A+A collisions were estimated basing on the chemically frozen hydrodynamic evolution that incorporates the decays of resonances at the freeze-out stage. We found that the resonance decays could increase significantly the pion interferometry volume, while the pion spectra slopes are not affected much by the decays in the region up to transverse momentum 1 GeV. We also notice that in such a model the resonance contributions reduce the ratio of outward to sideward interferometry radii.
Źródło:
Nukleonika; 2004, 49,suppl.2; 115-118
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-identical particle correlations in central Pb+Au collisions at 158 AGeV
Autorzy:
Antończyk, D.
Powiązania:
https://bibliotekanauki.pl/articles/148358.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
non-identical correlations
asymmetry
Opis:
Two-dimensional pion-proton correlation functions were analyzed in the central Pb+Au collision data taken by CERES at the top SPS energy. The correlations between the same- and the opposite-sign particles exhibit a minimum and a peak, respectively, at low relative momentum, caused by the mutual Coulomb interaction. The clearly visible asymmetry of the peak in the direction parallel to the pair momentum indicates that protons, on average, freeze-out at larger radii or at earlier times than pions. A similar result was obtained previously by the STAR experiment and was connected to the transverse flow. The high statistics of the CERES data set and the power of the two-dimensional analysis allow one to study how the observed displacement between the sources of pions and protons evolves with the transverse momentum.
Źródło:
Nukleonika; 2006, 51,suppl.3; 47-50
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of cereal seed shape with the use of sphericity factors
Autorzy:
Kaliniewicz, Z.
Biedulska, J.
Jadwisieńczak, B.
Powiązania:
https://bibliotekanauki.pl/articles/298142.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
seeds
dimensions
mass
shape
correlations
Opis:
Shape is one of the key discriminating factors in seeds. It plays a major role in seed cleaning and sorting, and it influences the bulk behavior of seeds. The shape of seeds can be described with the use of sphericity factors. In this study, the thickness, width, length and mass of principal cereal seeds (wheat, rye, barley, oats and triticale) were determined. The geometric parameters of seeds were used to calculate five sphericity factors for each seed type. The results of measurements and calculations were processed statistically by analysis of variance, correlation analysis and linear regression analysis. In the group of the analyzed cereal seeds, the lowest values were noted for sphericity factor K5 in the range of 0.046 to 0.275, and the highest values - for sphericity factor K3 in the range of 0.359 to 0.650. The shape of cereal seeds was mostly highly correlated with: thickness in barley seeds, width in wheat seeds, width and thickness in rye and triticale seeds, and length in oat seeds. All of the analyzed sphericity factors can be used interchangeably to describe the shape of cereal seeds, and the relationships between those factors can be described with linear equations.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2015, 18(4); 237-246
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BEC for photons and neutral pions
Autorzy:
Utyuzh, O.
Wilk, G.
Powiązania:
https://bibliotekanauki.pl/articles/147412.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
correlations
BEC
photons
neutral pions
Opis:
The role of BEC for photons and neutral pions is briefly discussed and illustrated by means of a new method of numerical modelling of BEC proposed by us recently.
Źródło:
Nukleonika; 2004, 49,suppl.2; 15-17
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for close-track efficiency study
Autorzy:
Mikhailov, K.
Stavinskiy, A.
Vlassov, A.
Mestayer, M.
Powiązania:
https://bibliotekanauki.pl/articles/147426.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
particle correlations
close track efficiency
Opis:
We describe two new methods for the study of close track efficiency. One is based on the study of a correlation function for particles with different masses as a function of their relative momenta in the laboratory reference system. The other method is based on the analysis of artificial events, constructed by merging raw data from separate events. Both methods and the standard Monte Carlo method were applied to data from the CLAS detector at Jefferson Laboratory. All three methods provide the same result for close track efficiency with an accuracy sufficient for practical application.
Źródło:
Nukleonika; 2004, 49,suppl.2; 85-88
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of hard processes on momentum correlations in pp and p(anti)p collisions
Autorzy:
Paić, G.
Skowroński, P.
Powiązania:
https://bibliotekanauki.pl/articles/148457.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
HBT
correlations
proton-proton collisions
hadronization
Opis:
The HBT radii extracted in pp and pp collisions at SPS and Tevatron show a clear correlation with the charged particle rapidity density. We propose to explain the correlation using a simple model where the distance from the initial hard parton-parton scattering to the hadronization point depends on the energy of the partons emitted. Since the particle multiplicity is correlated with the mean energy of the partons produced we can explain the experimental observations without invoking scenarios that assume a thermal fireball. The model has been applied with success to the existing experimental data both in the magnitude and the intensity of the correlation. The model has also been extended to pp collisions at the LHC energy of 14 TeV. The possibilities of a better insight into the string spatial development using 3D HBT analysis are discussed.
Źródło:
Nukleonika; 2006, 51,suppl.3; 83-87
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-identical particle correlations in STAR
Autorzy:
Janik, M.
Kisiel, A.
Szarwas, P.
Powiązania:
https://bibliotekanauki.pl/articles/147418.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
correlations
non-identical dynamics
emission asymmetries
Opis:
Non-identical particle correlations offer new methods of probing the dynamics of heavy-ion collision. In STAR we have performed a correlation analysis of pion-kaon and pion-proton systems for square root sNN = 130 AGeV Au+Au collisions. The results show that average emission space-time points of pions, kaons and protons are not the same. These results are studied with the help of heavy-ion collision models. The asymmetries appear as a consequence of space-momentum correlations produced by transverse radial expansion of the system. The effects of emission time differences, coming from the decay of resonances are also investigated, and found to explain only part of the asymmetry.
Źródło:
Nukleonika; 2004, 49,suppl.2; 77-80
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Baryon-baryon correlations in Au+Au collisions at square root sNN = 62 GeV and square root sNN = 200 GeV, measured in the STAR experiment at RHIC
Autorzy:
Gos, H.
Powiązania:
https://bibliotekanauki.pl/articles/148348.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
baryon
correlations
HBT
interferometry
STAR
RHIC
Opis:
Particle correlations at small relative velocities can be used to study the space-time evolution of hot and expanding system created in heavy-ion collisions. Baryon and antibaryon source sizes extracted from baryon-baryon correlations complement the information deduced from the correlation studies of identical pions. Correlations of nonidentical particles are sensitive also to the space-time asymmetry of their emission. High statistics data set of STAR experiment allows us to present the results of baryon-baryon correlation measurements at various centralities and energies, as well as to take carefully into account the particle identification probability and the fraction of primary baryons and antibaryons. Preliminary results show significant contribution of annihilation channel in baryon-antibaryon correlations.
Źródło:
Nukleonika; 2006, 51,suppl.3; 59-63
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the age of Scots pine (Pinus sylvestris L.) stands on the physical properties of seeds and the operating parameters of cleaning machines
Autorzy:
Kaliniewicz, Z.
Rawa, T.
Tylek, P.
Markowski, P.
Anders, A.
Fura, S.
Powiązania:
https://bibliotekanauki.pl/articles/298461.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
Scots pine
seeds
physical properties
correlations
Opis:
Critical transport velocity, the thickness, width, length, the angle of sliding friction and weight of Scots pine seeds harvested from conservation seed stands were measured. Correlations were determined between the age of parent stands (124 to 180 years old) and the above parameters of Scots pine seeds. Significant correlations were found between the age of parents stands and the weight, dimensions and the angle of sliding friction of seeds. Such a correlation was not observed for critical transport velocity. The noted correlations were presented as first-order equations which show that among the studied seed properties, average seed weight changed to the highest degree – it decreased by ca. 15% as Scots pine trees grew older.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(1); 63-72
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 100

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