We present a study of collective effects and dynamics of quark-hadron phase transitions by means of the femtoscopic correlations of hadrons at the NICA energies. A set of simulations of heavy-ion ...collisions (AuAu, BiBi) at the energies to be available with the NICA collider and experiments to be operated there (in particular, the MPD experiment), has been performed using two Monte Carlo generators. A femtoscopic analysis for charged pions and kaons have shown a sensitivity of the observables to the equation of state (EoS) for both event generators. Also, a study of the influence of detector effects like track-merging and track-splitting in the TPC, the main tracker device of the MPD experiment, on femtoscopic measurements is presented in this work.
Solubility in the NaCl-NH4Cl-KCl-H2O system Kudryashova, O. S.; Kudryashov, S. F.; Malinina, L. N.
Russian journal of inorganic chemistry,
10/2009, Letnik:
54, Številka:
10
Journal Article
Recenzirano
This is the first study of solubility in the NaCl-NH
4
Cl-KCl-H
2
O four-component water-salt system at 25, 50, and 75°C. Phase fields of individual salts and potassium and ammonium chloride solid ...solutions were demarcated. Experimental data were used to develop a mathematical model of the K
+
, Na
+
, NH
4
+
/Cl
−
, Cr
2
O
7
2−
-H
2
O five-component reciprocal system, which includes the title four-component system.
We outline structure-function contributions from our laboratories on protein-RNA recognition events that monitor siRNA length, 5 -phosphate and 2-nucleotide 3 overhangs, as well as the architecture ...of Argonaute, its externally bound siRNA complex, and Argonaute-based models involving guide-strand-mediated mRNA binding, cleavage, and release.
We report on the measurement of the inclusive J/
ψ
polarization parameters in pp collisions at a center of mass energy
s
=
8
TeV with the ALICE detector at the LHC. The analysis is based on a data ...sample corresponding to an integrated luminosity of 1.23 pb
-
1
. J/
ψ
resonances are reconstructed in their di-muon decay channel in the rapidity interval
2.5
<
y
<
4.0
and over the transverse-momentum interval
2
<
p
T
<
15
GeV
/
c
. The three polarization parameters (
λ
θ
,
λ
φ
,
λ
θ
φ
) are measured as a function of
p
T
both in the helicity and Collins-Soper reference frames. The measured J/
ψ
polarization parameters are found to be compatible with zero within uncertainties, contrary to expectations from all available predictions. The results are compared with the measurement in pp collisions at
s
=
7
TeV.
Triangular flow $v_3$ of identified and inclusive particles in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV is studied as a function of centrality and transverse momentum within the ...\textsc{hydjet++} model. The model enables one to investigate the influence of both hard processes and final-state interactions on the harmonics of particle anisotropic flow. Decays of resonances are found to increase the magnitude of the $v_3(p_{\rm T})$ distributions at $p_{\rm T} \geq 2$ GeV/$c$ and shift their maxima to higher transverse momenta. The $p_{\rm T}$-integrated triangular flow, however, becomes slightly weakened for all centralities studied. The resonance decays also modify the spectra towards the number-of-constituent-quark scaling fulfillment for the triangular flow, whereas jets are the main source of the scaling violation at the energies available at the CERN Large Hadron Collider (LHC). Comparison with the corresponding spectra of elliptic flow reveals that resonance decays and jets act in a similar manner on both $v_3(p_{\rm T})$ and $v_2(p_{\rm T})$ behavior. Obtained results are also confronted with the experimental data on differential triangular flow of identified hadrons, ratio $v_3^{1/3}(p_{\rm T}) / v_2^{1/2}(p_{\rm T})$ and $p_{\rm T}$-integrated triangular flow of charged hadrons.
7,8-dihydro-8-oxoguanine (oxoG), the predominant lesion formed following oxidative damage of DNA by reactive oxygen species, is processed differently by replicative and bypass polymerases. Our ...kinetic primer extension studies demonstrate that the bypass polymerase Dpo4 preferentially inserts C opposite oxoG, and also preferentially extends from the oxoG*C base pair, thus achieving error-free bypass of this lesion. We have determined the crystal structures of preinsertion binary, insertion ternary, and postinsertion binary complexes of oxoG-modified template-primer DNA and Dpo4. These structures provide insights into the translocation mechanics of the bypass polymerase during a complete cycle of nucleotide incorporation. Specifically, during noncovalent dCTP insertion opposite oxoG (or G), the little-finger domain-DNA phosphate contacts translocate by one nucleotide step, while the thumb domain-DNA phosphate contacts remain fixed. By contrast, during the nucleotidyl transfer reaction that covalently incorporates C opposite oxoG, the thumb-domain-phosphate contacts are translocated by one nucleotide step, while the little-finger contacts with phosphate groups remain fixed. These stepwise conformational transitions accompanying nucleoside triphosphate binding and covalent nucleobase incorporation during a full replication cycle of Dpo4-catalyzed bypass of the oxoG lesion are distinct from the translocation events in replicative polymerases.
The study of the scaled factorial moments of the multiplicity distribution in rapidity intervals as function of the rapidity interval size is presented for Au + Au interactions at √
s
NN
= 7.7 and ...11.5 GeV using the HYDJET++, UrQMD and vHLLE+UrQMD generators. This measurement is sensitive to the size and power of the multiparticle correlations. The sensitivity of the measurement to the initial conditions and properties of nuclear matter equation of state is discussed.
The correlation femtoscopy allows one to measure the space-time characteristics of particle production processes due to the effects of quantum statistics (QS) and final state interactions (FSI). ...Femtoscopy at lower energies was intensively studied at AGS, SPS and in the Beam Energy Scan (BES) program at RHIC. In the work we discuss possibilities to observe a difference from the first-order phase transition expected, according some theoretical predictions, at low energies and the crossover one, to be occurred at high energies, with the femtoscopy observables using the hybrid model vHLLE + UrQMD. The possibilities to use kaon femtoscopy complementary to the usually used pion one are discussed.
Data from the Large Hadron Collider on the charge balance function in Pb+Pb collisions at center-of-mass energy 2.76~TeV per nucleon pair are analyzed and interpreted within the framework of the ...\hydjet++ model. This model allows us to qualitatively reproduce the experimentally observed centrality dependence of the balance function widths at relatively low transverse momentum intervals due to the different charge creation mechanisms in soft and hard processes. However, a fully adequate description of the balance function in these intervals implies an essential modification of the model by including exact charge conservation via the canonical rather than the grand canonical ensemble. A procedure is proposed for introducing charge correlations into the thermal model without changing other model parameters. With increasing transverse momenta, the default model results describe the experimental data much better because the contribution of the soft component of the model is significantly reduced in these transverse momentum intervals. In practical terms, there is a transition to a single source of charge correlations, namely, charge correlations in jets in which exact charge conservation holds at each stage.
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