Acetyl ketene aminals in Nenitzescu reaction Alekseeva, L. M.; Mukhanova, T. I.; Panisheva, E. K. ...
Russian chemical bulletin,
1/1999, Letnik:
48, Številka:
1
Journal Article
Neutral pion transverse momentum spectra were measured in p+C and p+Pb collisions at sqrtS{NN}=17.4 GeV at midrapidity (2.3 less than or approximately equal eta{lab} less than or approximately equal ...3.0) over the range 0.7 less than or approximately equal p{T} less than or approximately equal 3.5 GeV/c. The spectra are compared to pi{0} spectra measured in Pb+Pb collisions at sqrtS{NN}=17.3 GeV in the same experiment. For a wide range of Pb+Pb centralities (N{part} less than or approximately equal 300), the yield of pi{0}'s with p{T} greater than or approximately equal 2 GeV/c is larger than or consistent with the p+C or p+Pb yields scaled with the number of nucleon-nucleon collisions (N{coll}), while for central Pb+Pb collisions with N{part}greater than or approximately equal 350, the pi{0} yield is suppressed.
The effect of the final state Coulomb interaction on particles produced in Pb + Pb collisions at 158AGeV/c has been investigated in the WA98 experiment through the study of the pi(-)/pi(+) and K-/K+ ...ratios measured as a function of T-m- (m)0. While the ratio for kaons shows no significant T-m dependence, the pi(-)/pi(+) ratio is enhanced at small T-m - (m)0 values with an enhancement that increases with centrality. A silicon pad detector located near the target is used to estimate the contribution of hyperon decays to the pi(-)/pi(+) ratio. The comparison of results with predictions of the RQMD model in which the Coulomb interaction has been incorporated allows to place constraints on the time of the pion freeze-out.
The article reveals the legal problems of international legal status and the regime of use of transboundary waters of the Republic of Kazakhstan, which mostly do not have a clear international legal ...status and the regime of their use. This circumstance worsens the ecological situation in the region, exacerbates the interstate contradictions of the Republic of Kazakhstan with neighbouring countries and has a negative impact on the socio-economic development of the country. The article highlights the interstate problem related to the definition of the regime of use of transboundary waters with the People' Republic of China that can be solved only on a tripartite basis. Article reveals vulnerability of position of Republic of Kazakhstan in negotiations on transboundary rivers with the People' Republic of China and necessity to resolve this problem with the participation of the Russian side.
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