No abstract

No abstract

No abstract

Based on A Multi-Phase Transport (AMPT) model, we have studied the elliptic flow v2 of φ mesons from reconstructed K + K − decay channel at the top Relativistic Heavy Ion Collider energy at Brookhaven National Laboratory. The dependences of v2 on transverse momentum pT and collision centrality are presented and the rescattering effect of φ mesons in the hadronic phase is also investigated. The results show that experimental measurement of v2 for φ mesons can retain the early collision information before φ decays and that the φ v2 value obeys the constituent quark number scaling which has been observed for other mesons and baryons. Our study indicates that the φ v2 mostly reflects partonic level collectivity developed during the early stage of the nucleusnucleus collision and the strange and light up/down quarks have developed similar angular anistropy properties at the hadronization.

No abstract

Cereals and soybeans are the main food sources for the majority of Chinese. This study evaluated the effects of four common cooking methods including steaming, boiling, frying, and milking on selenium (Se) content and speciation in seven selenium bio-fortified cereals and soybeans samples. The Se concentrations in the selected samples ranged from 0.91 to 110.8 mg/kg and selenomethionine (SeMet) was detected to be the main Se species. Total Se loss was less than 8.1% during the processes of cooking except milking, while 49.1% of the total Se was lost in milking soybean for soy milk due to high level of Se in residuals. It was estimated that about 13.5, 24.0, 3.1, and 46.9% of SeMet were lost during the processes of steaming, boiling, frying, and milking, respectively. Meanwhile, selenocystine (SeCys2) and methylselenocysteine (SeMeCys) were lost completely from the boiled cereals. Hence, steaming and frying were recommended to cook Se-biofortified cereals in order to minimize the loss of Se.

No abstract

The heterogeneous UV/Fenton degradation of tetrabromobisphenol A (TBBPA) catalyzed by nanocrystalline Fe 3 O 4 and Fe 2 04 Cr 0 96 O 4 was investigated, with focus on the influence of UV light and initial pH, degradation pathways and effect of Cr substation. The catalysts were prepared by a precipitation-oxidation method and characterized by chemical analysis, XRD, XAFS, TG-DSC, BET surface area and magnetometer. At pH 6.7 and under UV irradiation, almost complete degradation of TBBPA by Fe 2 04 Cr 0 96 O 4 was accomplished within 240 min, and the leaching Fe ions were negligible. The substitution of chromium greatly increased the BET specific surface area and surface hydroxyl amount, which improved the heterogeneous UV/Fenton catalytic activity of magnetite. Moreover, Cr 3+ on the octahedral sites enhanced the electron transfer process in the magnetite structure to accelerate the • OH generation. The produced • OH radicals preferentially attacked the C Br bonds of TBBPA and then -cleavaged the C C bonds between benzene rings and isopropyl groups. The above results are of great significance for well understanding the effect of transition metal substitution on the UV/Fenton catalytic activity of magnetite and prospecting the application of magnetite minerals in environmental purification.