Beijing Institute of Petrochemical Technology

About: Beijing Institute of Petrochemical Technology is a education organization based out in Beijing, China. It is known for research contribution in the topics: Catalysis & Corrosion. The organization has 2468 authors who have published 1937 publications receiving 19270 citations.

Improved measurements of two-photon widths of the chi(cJ) states and helicity analysis for chi(c2) -> gamma gamma

Abstract: Based on 448.1 x 10(6) Psi(3686) events collected with the BESIII detector, the decays Psi(3686) -> gamma chi(cJ), chi(cJ) -> gamma gamma(J = 0, 1, 2) are studied. The decay branching fractions of chi(c0,2) -> gamma gamma are measured to be B(chi(c0) -> gamma gamma) = (1.93 +/- 0.08 +/- 0.05 +/- 0.05) x 10(-4) and B(chi(c2) -> gamma gamma) = (3.10 +/- 0.09 +/- 0.07 +/- 0.11) x 10(-4) which correspond to two-photon decay widths of Gamma(gamma gamma)(chi(c0)) = 2.03 +/- 0.08 +/- 0.06 +/- 0.13 keV and Gamma(gamma gamma)(chi(c2)) = 0.60 +/- 0.02 +/- 0.01 +/- 0.04 keV with a ratio of R = Gamma(gamma gamma)(chi(c2))/Gamma(gamma gamma)(chi(c0)) = 0.295 +/- 0.014 +/- 0.007 +/- 0.027, where the uncertainties are statistical, systematic and associated with the uncertainties of B(Psi(3686) -> gamma chi(c0,2)) and the total widths Gamma(chi(c0,2)), respectively. For the forbidden decay of chi(c1) -> gamma gamma, no signal is observed, and an upper limit on the two-photon width is obtained to be Gamma(gamma gamma)(chi(c1)) gamma gamma is also measured to be f(0/2) = Gamma(lambda=0)(gamma gamma) (chi(c2))/Gamma(lambda=2)(gamma gamma) (chi(c2)) = (0.0 +/- 0.6 +/- 1.2) x 10(-2), where the uncertainties are statistical and systematic, respectively.

Decolourization performance and mechanism of leachate secondary effluent using Poly-aluminium(III)–magnesium(II) sulphate

Abstract: Poly-aluminium(III)–magnesium(II) sulphate (PMAS) was used to remove the colour from the secondary effluent of landfill leachate and the decolourization mechanism was researched. The results indicated that the decolourization efficiency using PMAS was better than the decolourization that occurred using other traditional coagulants, with a colour removal >90%. X-ray diffraction and infrared spectrometry showed that PMAS was probably a type of macromolecular composite polymer of aluminium and magnesium that was based on –OH bonds. The coagulation mechanism of PMAS was primarily charge neutralization and coprecipitation netting, with charge neutralization being the dominant mechanism at low doses. In addition, the flocculation behaviour differed in response to various pH values of wastewater at high doses. Specifically, flocculation was primarily driven by charge neutralization at a low pH and coprecipitation netting at a high pH, while it occurred via a combination of these procedures under neutral conditions.

Polarographic Investigation and Determination of Bilirubin

Abstract: A rapid and sensitive polarographic method for the determination of bilirubin is described. In a solution containing 0.03M NaOH, 1.0×10-3M Na2SO3 and 2.0×10-4M EDTA, bilirubin can cause a polarographic wave at about -0.26V (vs. SCE) when potential sweeps from -0.65V to -0.1V. The peak current varies linearly with bilirubin concentration over a range of 8.0×10-8M to 6.0×10-6M as determined by derivative linear sweep polarography. A low detection limit of 5×10-8M is obtained. The method has been developed for the determination of bilirubin in serum and medicine. In this research, the characteristics of the polarographic wave have been investigated, and it has been confirmed to be an adsorptive wave. The electrochemical mechanism is discussed, the wave is ascribed to the oxidation of mercury.