The separation and identification of isotopes emitted from the projectile fragmentation reaction of 80 MeV/u 20Ne on 9Be target were carried out by using the radioactive ion beam line in Lanzhou(RIBLL).Many proton ric...The separation and identification of isotopes emitted from the projectile fragmentation reaction of 80 MeV/u 20Ne on 9Be target were carried out by using the radioactive ion beam line in Lanzhou(RIBLL).Many proton rich isotopes are obtained.Their intensity and purity fit the theoretical calculations.Good separation and identification abilities of RIBLL A/ΔA>300 and Q/ΔQ>150,are obtained.展开更多
In the past,only one performance parameter was considered in the reliability estimation of micro-electro-mechanical system (MEMS) accelerometers,resulting in a one-sided reliability evaluation. Aiming at the failure c...In the past,only one performance parameter was considered in the reliability estimation of micro-electro-mechanical system (MEMS) accelerometers,resulting in a one-sided reliability evaluation. Aiming at the failure condition of large range MEMS accelerometers in high temperature environment,the corresponding accelerated degradation test is designed. According to the degradation condition of zero bias and scale factor,multiple dependent reliability estimation of large range MEMS accelerometers is carried out. The results show that the multiple dependent reliability estimation of the large range MEMS accelerometers can improve the accuracy of the estimation and get more accurate results.展开更多
目的探讨研究乙型肝炎病毒(hepatic B virus,HBV)感染对患者Wnt/β-catenin信号通路的影响及其临床意义。方法研究收集西安交通大学第一附属医院2014年8月-2018年8月初治HBV感染患者300例,所有患者均接受肝脏穿刺活检,取得的标本进行石...目的探讨研究乙型肝炎病毒(hepatic B virus,HBV)感染对患者Wnt/β-catenin信号通路的影响及其临床意义。方法研究收集西安交通大学第一附属医院2014年8月-2018年8月初治HBV感染患者300例,所有患者均接受肝脏穿刺活检,取得的标本进行石蜡包埋,此为试验组。另外选取100名健康志愿者肝脏组织标本作为对照组。采用高通量实时荧光定量PCR技术、Western blot方法分别检测试验组与对照组患者Wnt以及β-catenin的表达水平。300例HBV感染患者中,有156例患者合并肝硬化为肝硬化组,144例患者未合并肝硬化为非肝硬化组,采用实时荧光定量聚合酶链式反应法(Polymerase Chain Reaction,PCR)、Western blot法分别检测两组患者的Wnt、β-catenin的表达水平,评估HBV对于Wnt/β-catenin信号通路的影响。结果与对照组相比,试验组患者的Wnt-1以及β-catenin的蛋白质、mRNA表达水平均升高(P<0.05);试验组患者肝脏组织的Wnt-1以及β-catenin表达的阳性率分别为26.0%和25.3%,较对照组的9.0%和8.0%高(P<0.05);与非肝硬化组相比,肝硬化组患者的肝脏组织的Wnt-1以及β-catenin的蛋白质、mRNA表达水平均升高(P<0.05);肝硬化组患者肝脏组织的Wnt-1以及β-catenin表达的阳性率分别为34.0%和32.1%,较非肝硬化组的15.3%和13.2%高(P<0.05)。结论HBV患者的Wnt/β-catenin信号通路相关因素Wnt-1以及β-catenin的表达升高,且Wnt以及β-catenin的表达与HBV感染后肝脏病变进展程度密切关联。展开更多
文摘首次建立了离子选择电极法测定铅精矿中的氟。实验采用碱熔法对样品进行前处理,研究了氢氧化钠用量、熔融温度、熔融时间、柠檬酸钠用量、pH值等因素对氟测定的影响,最终确定氢氧化钠用量为6 g、熔融温度550℃、熔融时间10 min、柠檬酸钠溶液用量15 m L、pH值为6.0~7.0的实验条件。在最优条件下,氟的平均加标回收率为96.7%~107.3%,相对标准偏差为1.21%~3.45%。该方法准确度高、操作简单、重现性好,能够对铅精矿中的氟进行定量分析。
基金Supported by the Chinese Academy of Sciencesthe National Committee of Science and Technology of China。
文摘The separation and identification of isotopes emitted from the projectile fragmentation reaction of 80 MeV/u 20Ne on 9Be target were carried out by using the radioactive ion beam line in Lanzhou(RIBLL).Many proton rich isotopes are obtained.Their intensity and purity fit the theoretical calculations.Good separation and identification abilities of RIBLL A/ΔA>300 and Q/ΔQ>150,are obtained.
文摘In the past,only one performance parameter was considered in the reliability estimation of micro-electro-mechanical system (MEMS) accelerometers,resulting in a one-sided reliability evaluation. Aiming at the failure condition of large range MEMS accelerometers in high temperature environment,the corresponding accelerated degradation test is designed. According to the degradation condition of zero bias and scale factor,multiple dependent reliability estimation of large range MEMS accelerometers is carried out. The results show that the multiple dependent reliability estimation of the large range MEMS accelerometers can improve the accuracy of the estimation and get more accurate results.
