نتایج جستجو برای: lead pb
تعداد نتایج: 366110 فیلتر نتایج به سال:
The most abundant components of primitive meteorites (chondrites) are millimeter-sized glassy spherical chondrules formed by transient melting events in the solar protoplanetary disk. Using Pb-Pb dates of 22 individual chondrules, we show that primary production of chondrules in the early solar system was restricted to the first million years after the formation of the Sun and that these existi...
Wei Li,1 Li Huang,1,* Raj Ganesh S. Pala,2,3 Guang-Hong Lu,4,5 Feng Liu,6 James W. Evans,7,8 and Yong Han7,8,† 1Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, People’s Republic of China 2Department of Chemical Engineering, Indian Institute of Technology Kanpur, UP, 208016, India 3Material Science Programme, Indian Institute of Technology Kanpur...
This study investigated the impacts of two best management practices (BMPs) recommended by US Environmental Protection Agency on Pb weathering and leachability in shooting range soils. The two BMPs included replacing soil berm with sand berm and periodically removing bullets or shot from a berm. A column experiment corresponding to the first BMP was conducted by mixing the bullets with sand/soi...
We compare chemical and thermal analysis of the SPS Pb–Pb results at 158A GeV, and present a first chemical analysis of RHIC results. We show how a combined analysis of several strange hadron resonances can be used in a study of freeze-out dynamics.
The nature and behavior of electronic states in high temperature superconductors are the center of much debate. The pseudogap state, observed above the superconducting transition temperature Tc, is seen by some as a precursor to the superconducting state. Others view it as a competing phase. Recently, this discussion has focused on the number of energy gaps in the system. Some experiments indic...
We suggest that the new regime of J/ψ suppression in Pb-Pb collisions found by the NA50 experiment at CERN is the result of nontrivial space-time evolution due to specific behavior of the Equation of State (EOS) near the QCD phase transition. We also study another suppression channel, the conversion of J/ψ into ηc during the late cool hadronic stage, and find it rather inefficient.
High energy p-p, p-Pb and Pb-Pb collisions at the CERN-LHC offer unprecedented opportunities for studying wide variety of physics at small Bjorken-x. Here we discuss capabilities of the ALICE experiment at the CERN-LHC for probing small-x QCD physics. A new forward electromagnetic calorimeter is being proposed as an ALICE upgrade to explore the small-x region in more detail.
Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η|<2.4...
The production of K * (892) 0 and φ(1020) mesons has been measured in p–Pb collisions at √ s NN = 5.02 TeV. K * 0 and φ are reconstructed via their decay into charged hadrons with the ALICE detector in the rapidity range −0.5 < y < 0. The transverse momentum spectra, measured as a function of the multiplicity, have a p T range from 0 to 15 GeV/c for K * 0 and from 0.3 to 21 GeV/c for φ. Integra...
In most of the models of hadronic collisions the number of exchanged colour strings grows with energy and atomic numbers of the projectile and target. At high string densities interaction between them becomes important, which should melt them into the quark-gluon plasma state in the end. It is shown that under certain reasonable assumptions about the the string interaction, a phase transition t...
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