Documents in process

An analysis of the bottom baryon decay Λb→J/ψ(→μ+μ-)Λ(→pπ-) is performed to measure the Λb polarization and three angular parameters in data from pp collisions at s=7 and 8 TeV, collected by the CMS experiment at the Large Hadron Collider. The Λb polarization is measured to be 0.00±0.06(stat)±0.06(syst) and the parity-violating asymmetry parameter is determined to be 0.14±0.14(stat)±0.10(syst). [...]

The transverse momentum balance of pairs of back-to-back b quark jets in PbPb and pp collisions recorded with the CMS detector at the LHC is reported. The center-of-mass energy in both collision systems is 5.02 TeV per nucleon pair. [...]

An equiatomic CrCoNi medium-entropy alloy was subjected to high-pressure torsion.This process led to a refinement of the microstructure to a grain size of about 50 nm, combined witha strong increase in the materials hardness. Subsequently, the thermodynamic stability of the mediumentropy alloy was evaluated by isothermal and isochronal heat treatments. [...]

The interaction of the I-phase with twins during compression has been studied in a Mg-6Zn-1Y (wt.%)alloy using the combination of Synchrotron Radiation Diffraction and Acoustic Emission experimentsduring compression tests. The I-phase occurs as coarse particles at grain boundaries and nanosizedprecipitates within magnesium grains. [...]

Conventional linacs used for modern free-electron lasers carry electron beams of unprecedented brightness with average powers ranging from a few watts to hundreds of kilowatts. Energy recovery linacs are already operated as radiation sources with nominal electron beam powers beyond 1 MW, and this figure can only be expected to increase in the future. [...]

The objective of this research is to examine how copper modification can improve the photocatalytic activity of TiO2-SiO2, and to explain the correlation between Cu concentration and chemical state of Cu cations in the TiO2-SiO2 matrix, and the photocatalytic activity under the UV/solar irradiation. The Cu-modified TiO2-SiO2 photocatalysts were prepared by a low temperature sol-gel method based on organic copper, silicon and titanium precursors with varied Cu concentrations (from 0.05 to 3 mol%). [...]

Abstract–Coesite and stishovite are high-pressure silica polymorphs known to have beenformed at several terrestrial impact structures. They have been used to assess pressure andtemperature conditions that deviate from equilibrium formation conditions. [...]