85 research outputs found

    The Physics of the B Factories

    Get PDF

    Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at √s=0.9 and 2.36 TeV

    Get PDF
    Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at root s = 0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diffractive interactions, the average charged-hadron transverse momentum is measured to be 0.46 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2.4 and +2.4. At these energies, the measured pseudorapidity densities in the central region, dN(ch)/d eta vertical bar(vertical bar eta vertical bar and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date

    Mechanistically informed pathway kinetic model for the Fischer-Tropsch wax hydrocracking

    No full text
    Production of synthetic liquid fuels via Fischer-Tropsch (FT)-based technologies is a valuable way to obtain clean fuels from several raw materials. The hydrocracking process to which the waxes must be subjected has the aim to increase the yield in middle distillates and to improve the fuel cold flow properties. In this paper a mechanistically informed pathways-level kinetic model for the hydrocracking process is proposed. The model, generated by means of the INGen software, is a molecular pathway-type model that can be considered a good compromise between a detailed enough description of the system and a certain degree of simplicity that allows the application of this kind of model to complex feedstocks such as those typical of FT wax hydrocracking. In this case it may be necessary to further reduce the model equations and thus a proposal of a relumping strategy for the obtained reaction network is also shown

    Antioxidant activity applying an improved ABTS radical cation decolorization assay

    No full text
    method for the screening of antioxidant activity is reported as a decolorization assay applicable to both lipophilic and hydrophilic antioxidants, including flavonoids, hydroxycinnamates, carotenoids, and plasma antioxidants. The pre-formed radical monocation of 2,29-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS•1) is generated by oxidation of ABTS with potassium persulfate and is reduced in the presence of such hydrogen-donating antioxidants. The influences of both the concentration of antioxidant and duration of reaction on the inhibition of the radical cation absorption are taken into account when determining the antioxidant activity. This assay clearly improves the original TEAC assay (the ferryl myoglobin/ABTS assay) for the determination of antioxidant activity in a number of ways. First, the chemistry involves the direct generation of the ABTS radical monocation with no involvement of an intermediary radical. Second, it is a decolorization assay; thus the radical cation is pre-formed prior to addition of antioxidant test systems, rather than the generation of the radical taking place continually in the presence of the antioxidant. Hence the results obtained with the improved system may not always be directly comparable with those obtained using the original TEAC assay. Third, it is applicable to both aqueous and lipophilic systems
    • …
    corecore