作者：
Wan Ren-Zhuo*;Xu Chun-Cheng;Zhou Dai-Cui（周代翠）;Yin Zhong-Bao
期刊：
中国物理C,2008年32(8):620-623 ISSN：1674-1137
通讯作者：
Wan Ren-Zhuo
作者机构：
[Zhou Dai-Cui; Wan Ren-Zhuo; Yin Zhong-Bao; Xu Chun-Cheng] Huazhong Normal Univ, Minist Educ, Key Lab Quak & Lepton Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Wan Ren-Zhuo] H;Huazhong Normal Univ, Minist Educ, Key Lab Quak & Lepton Phys, Wuhan 430079, Peoples R China.
关键词：
ALICE experimental simulation;photon detection;track reconstruction;track matching efficiency
摘要：
We present a study for matching charged tracks reconstructed from the ALICE tracking detectors with the clusters measured in the photon spectrometer. Matching efficiency and contaminations due to wrong matches have been deduced for charged pions and muons. For electrons, the effect of the material in front of PHOS is discussed.
摘要：
A vinyl-type polymer of norbornene containing a few pendant styrene groups obtained by copolymerization of norbornene and 1,4-divinylbenzene (1,4-DVB) was used as a macroinitiator in the reverse atom transfer radical polymerization (RATRP) of methyl methacrylate in conjunction with CuCl2/2,2'-bipyridine/2,2'- azobisisobutyronitrile (AIBN) as a catalyst. In the first step of the reaction, the structural characterization of the copolymers showed that norbornene and 1,4-divinylbenzene copolymerizations occur as a coordination mechanism and that true copolymers are formed by random copolymerization. With the initiation of copper dichloride and AIBN in the second step, the pendant styrene groups in the copolymers were quantitatively polymerized with methyl methacrylates, which allowed the successful synthesis of polynorbornene-based graft copolymers by RATRP mechanism. The analyses of the product by 1H-and 13C-NMR and GPC gel permeation chromatography (GPC) gave the verification of 'true' copolymer. Varying the monomer feed ratio controlled the thermal property of the graft copolymer.
作者机构：
[Wu, Shuang-Qing] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Wu, Shuang-Qing] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
摘要：
I present the general exact solutions for nonextremal rotating charged black holes in the Gödel universe of five-dimensional minimal supergravity theory. They are uniquely characterized by four nontrivial parameters: namely, the mass m, the charge q, the Kerr equal rotation parameter a, and the Gödel parameter j. I calculate the conserved energy, angular momenta, and charge for the solutions and show that they completely satisfy the first law of black hole thermodynamics. I also study the symmetry and separability of the Hamilton-Jacobi and the massive Klein-Gordon equations in these Einstein-Maxwell-Chern-Simons-Gödel black hole backgrounds.
摘要：
Ail improved liquid-liqllid-liquid microextraction (LLLME) technique has been put forward based on the principle of single drop LLLME. In the technique, a vial insert was firstly utilized as acceptor phase container. Because the diameter of the bottom of the vial insert was small, the contact area between the acceptor phase and the vial insert was bigger than that between microsyringe and microdrop of acceptor phase in single drop LLLME, and the stability of microdrop, was increased markedly. More acceptor phase could be held in the improved method than that in single drop LLLME, and the sensitivity of the method was increased. The sample vial and vial insert were horizontally placed so that the density of organic solvent has little effect on the selection of organic solvents. Aqueous ammonia and toluene were selected as the acceptor phase and the organic phase, respectively. The improved method was successfully applied to determine four phenolic compounds in real aqueous samples. Good recoveries that ranged from 82.2% to 117.2% were obtained. The intra-day and inter-day reproducibilities (RSD) were under 4.8% and 6.8%. respectively. The extraction efficiency of the improved method was 11-47 times higher than that of single drop LLLME method. The improved LLLME method is economical, rapid, simple, efficient, low organic solvent Consumption and no cross-containment. This method is very suitable for the extraction of ionizable and chargeable analyte in complex environmental or biological samples. (C) 2008 Elsevier B.V. All rights reserved.
