Vacuum creation of quarks at the time scale of QGP thermalization and strangeness enhancement in heavy-ion collisions

The vacuum parton creation in quickly varying external fields is studied at the time scale of order 1 fm/$c$ typical for the quark-gluon plasma formation and thermalization. To describe the pre-equilibrium evolution of the system the transport kinetic equation is employed. It is shown that the dynamics of production process at times comparable with particle inverse masses can deviate considerably from that based on classical Schwinger-like estimates for homogeneous and constant fields. One of the effects caused by non-stationary chromoelectric fields is the enhancement of the yield of $s\bar{s}$ quark pairs. Dependence of this effect on the shape and duration of the field pulse is studied together with the influence of string fusion and reduction of quark masses.Comment: REVTEX, 11pp. incl. 4 figures, to be published in Phys. Lett.

Superposition effect and clan structure in forward-backward multiplicity correlations

The main purpose of this paper is to discuss the link between forward-backward multiplicity correlations properties and the shape of the corresponding final charged particle multiplicity distribution in various classes of events in different collisions. It is shown that the same mechanism which explains the shoulder effect and the H_n vs. n oscillations in charged particle multiplicity distributions, i.e., the weighted superposition of different classes of events with negative binomial properties, reproduces within experimental errors also the forward-backward multiplicity correlation strength in e+e- annihilation at LEP energy and allows interesting predictions for pp collisions in the TeV energy region, to be tested at LHC, for instance with the ALICE detector. We limit ourselves at present to study substructures properties in hadron-hadron collisions and e+e- annihilation; they are examined as ancillary examples in the conviction that their understanding might be relevant also in other more complex cases.Comment: 16 page

Production of Secondaries in High Energy d+Au Collisions

In the framework of Quark-Gluon String Model we calculate the inclusive spectra of secondaries produced in d+Au collisions at intermediate (CERN SPS) and at much higher (RHIC) energies. The results of numerical calculations at intermediate energies are in reasonable agreement with the data. At RHIC energies numerically large inelastic screening corrections (percolation effects) should be accounted for in calculations. We extract these effects from the existing RHIC experimental data on minimum bias and central d+Au collisions. The predictions for p+Au interactions at LHC energy are also given.Comment: 18 pages and 10 figure

Production of secondaries in soft p+pb collisions at LHC

We calculate the inclusive spectra of secondaries produced in soft (minimum bias) p+Pb collisions in the framework of Quark-Gluon String Model at LHC energy, and by taking into account the inelastic screening corrections (percolation effects). The role of these effects is expected to be very large at very high energies, and they should decrease the spectra about 3 times in the midrapidity region and increase them about 2 times in the fragmentation region at the energy of LHC.Comment: 18 pages and 10 figures. arXiv admin note: text overlap with arXiv:0802.219

Features of adaptation of photosynthesis of winter wheat plant leaves to growing conditions

Depending on the growing conditions, the intensity of photosynthesis of winter wheat plant leaves varies from 7.58 to 15.76 µmol CO2/m2s, significantly decreasing (on average by 41%) in dry and hot weather. During the day, its value varies from 7.07 to 12.48 µmol CO2/m2s, reaching a maximum (12.48 µmol CO2/m2s) in the morning (from 9:00 to 11:00 am), when the air temperature is not so high (from 18 to 23°C), and the light becomes saturating (1000 -1300 µmol/m2s). In the time following, the intensity of leaf photosynthesis decreases, reaching the minimum values at 7:00 pm. At the same time, the flag leaves of plants are characterized by the highest photosynthetic activity - from 12.56 to 16.16 µmol CO2/m2s, exceeding the pre-flag leaves by 1.6 times, and the lower ones by 3.1 times. The stomatal apparatus plays an important role in the adaptation of leaf photosynthesis to environmental factors. The correlation coefficient of photosynthesis intensity with stomatal conductivity in different leaf locations varied from 0.97 to 0.98