The object of this article is to initiate the study of a class of rings in which the right duo property is applied in relation to powers of elements and the monoid of all regular elements.Such rings shall be called ri...The object of this article is to initiate the study of a class of rings in which the right duo property is applied in relation to powers of elements and the monoid of all regular elements.Such rings shall be called right exp-DR.We investigate the structures of group rings,right quotient rings,matrix rings and(skew)polynomial rings,through the study of right exp-DR rings.In addition,we provide a method of constructing finite non-abelian p-groups for any prime p.展开更多
目的寻找一种更快速、简便的人类免疫缺陷病毒(HIV)感染的筛查方法。方法对门诊和住院手术患者标本以及疾病控制中心质控标本,采用VIDAS HIV DUO Ultra方法(简称VIDAS)测定HIV p24抗原和HIV抗体,并与第3代酶联免疫吸附试验(ELISA)以...目的寻找一种更快速、简便的人类免疫缺陷病毒(HIV)感染的筛查方法。方法对门诊和住院手术患者标本以及疾病控制中心质控标本,采用VIDAS HIV DUO Ultra方法(简称VIDAS)测定HIV p24抗原和HIV抗体,并与第3代酶联免疫吸附试验(ELISA)以及明胶粒子凝集法(PA)测定结果进行比较。结果对50份标本采用VIDAS进行检测,其敏感性和特异性分别为91.7%和92.1%。结论VIDAS可作为一种更简便的HIV检测方法,在生物安全控制方面较其他2种方法更安全有效。展开更多
This is a GATE-simulation study of the Siemens Biograph DUO PET/CT system. It reports effects of changes in the thickness of the employed Lutetium Oxyorthosilicate(LSO) detectors. The PET/CT, a human body phantom and ...This is a GATE-simulation study of the Siemens Biograph DUO PET/CT system. It reports effects of changes in the thickness of the employed Lutetium Oxyorthosilicate(LSO) detectors. The PET/CT, a human body phantom and a cylindrical F-18 FDG source were simulated. Validation measurements were conducted. The results indicate that LSO thickness increase degrades spatial resolution, improves relative energy resolution from 9.0% to 11.3% and increases signal-to-noise-ratio from 0.81 to 1.17. Thicker LSO crystals present greater axial sensitivity so as the detection efficiency of PET would be significantly enhanced.展开更多
文摘The object of this article is to initiate the study of a class of rings in which the right duo property is applied in relation to powers of elements and the monoid of all regular elements.Such rings shall be called right exp-DR.We investigate the structures of group rings,right quotient rings,matrix rings and(skew)polynomial rings,through the study of right exp-DR rings.In addition,we provide a method of constructing finite non-abelian p-groups for any prime p.
文摘目的寻找一种更快速、简便的人类免疫缺陷病毒(HIV)感染的筛查方法。方法对门诊和住院手术患者标本以及疾病控制中心质控标本,采用VIDAS HIV DUO Ultra方法(简称VIDAS)测定HIV p24抗原和HIV抗体,并与第3代酶联免疫吸附试验(ELISA)以及明胶粒子凝集法(PA)测定结果进行比较。结果对50份标本采用VIDAS进行检测,其敏感性和特异性分别为91.7%和92.1%。结论VIDAS可作为一种更简便的HIV检测方法,在生物安全控制方面较其他2种方法更安全有效。
文摘This is a GATE-simulation study of the Siemens Biograph DUO PET/CT system. It reports effects of changes in the thickness of the employed Lutetium Oxyorthosilicate(LSO) detectors. The PET/CT, a human body phantom and a cylindrical F-18 FDG source were simulated. Validation measurements were conducted. The results indicate that LSO thickness increase degrades spatial resolution, improves relative energy resolution from 9.0% to 11.3% and increases signal-to-noise-ratio from 0.81 to 1.17. Thicker LSO crystals present greater axial sensitivity so as the detection efficiency of PET would be significantly enhanced.
