The inclusive $J/\psi$ transverse momentum ($p_{T}$) spectra and nuclearmodification factors are reported at midrapidity ($|y|<1.0$) in Au+Aucollisions at $\sqrt{s_{NN}}=$ 39, 62.4 and 200 GeV taken by the STARexperiment. A suppression of $J/\psi$ production, with respect to{\color{black}the production in $p+p$ scaled by the number of binarynucleon-nucleon collisions}, is observed in central Au+Au collisions at thesethree energies. No significant energy dependence of nuclear modificationfactors is found within uncertainties. The measured nuclear modificationfactors can be described by model calculations that take into account bothsuppression of direct $J/\psi$ production due to the color screening effect and$J/\psi$ regeneration from recombination of uncorrelated charm-anticharm quarkpairs.
The main task of machine production is assuring their operating quality, directly depending on components operating characteristics. Characteristics, assuring the components performing set functions under set operating conditions and assuring set components’ life, are considered as operating characteristics of separate surfaces and whole components. The common method of engineering support of the operating characteristics is based on necessity of assuring certain engineering and manufacturing quality parameters during production based on the assumption that they warrant reaching set operating characteristics. It is already proved that different sets and sequences of process methods can lead to similar components quality engineering and manufacturing parameters, but to significantly different operating characteristics. The method of process design, based on superimposing process impact results on production subject, has run its course.Suggested concept of controlled forming of goods (in particular, components) characteristics considers their reached quality as a result of transforming its separate parameters, taking into account operative impact on production object, as well, as succession and mutual influence of forming features. In order to describe the transformation a mathematical tool, allowing deterministic stochastic modeling of such transformation, was worked out. The present work includes using the concept for controlled forming of set operating characteristics of goods, using components as example. The perspective is to form technological solutions, 100% assuring directly set operating characteristics of operating surfaces or the whole component.It is demonstrated that the necessary and sufficient level of warranted assuring set operating characteristics should be limited and should take into account influence of the emergence of the technological process as a system on results of the elementary solutions, performed in such system
A novel iron fluorophosphite, NaFe3(HPO3)2((H,F)PO2OH)6, was synthesized by a dry low-temperature synthesis route. The phase was shown to be electrochemically active for reversible insertion of Na(+) ions, with an average discharge voltage of 2.5 V and an experimental capacity at low rates of up to 90 mAhg(-1). Simple synthesis, low-cost materials, excellent capacity retention, and efficiency suggest this class of material is competitive with similar oxyanion-based compounds as a cathode material for Na batteries. The characterization of physical properties by means of magnetization, specific heat, and electron spin resonance measurements confirms the presence of two magnetically nonequivalent Fe(3+) sites. The compound orders magnetically at TC ≈ 9.4 K into a state with spontaneous magnetization.
Elucidating the nature of the magnetism of a high-temperature superconductoris crucial for establishing its pairing mechanism. The parent compounds of thecuprate and iron-pnictide superconductors exhibit N\'eel and stripe magneticorder, respectively. However, FeSe, the structurally simplest iron-basedsuperconductor, shows nematic order (Ts = 90 K), but not magnetic order in theparent phase, and its magnetic ground state is intensely debated. Here, wereport inelastic neutron-scattering experiments that reveal both stripe andN\'eel spin fluctuations over a wide energy range at 110 K. On entering thenematic phase, a substantial amount of spectral weight is transferred from theN\'eel to the stripe spin fluctuations. Moreover, the total fluctuatingmagnetic moment of FeSe is ~ 60% larger than that in the iron pnictideBaFe2As2. Our results suggest that FeSe is a novel S = 1 nematicquantum-disordered paramagnet interpolating between the N\'eel and stripemagnetic instabilities.