流动注射氢化物原子吸收法测定山茱萸中的汞、铅、砷

利用流动注射氢化物原子吸收法,测定了陕西省汉中市山茱萸成品中汞、铅、砷三种元素的含量。所测四种产品的汞含量在0.04～0.06 mg/kg之间,平均回收率为101.0,RSD为4.14;铅的含量在0.151～0.190mg/kg之间,回收率为100.8,RSD为1.63;砷的含量在0.015～0.016mg/kg之间,回收率为100.4,RSD为1.14。山莱萸中汞、铅、砷含量有个体差异,但含量都远低于《药用植物及药用试剂出口绿色行业标准》。     

回路振荡热管运行机理探讨

通过对回路振荡热管的稳定性实验研究;观察其稳定运行时,工质的运动特征和运行现象;研究热管稳定振荡时传热性能与加热功率,加热端与冷却端的布置方式的关系,讨论振荡热管运行中的各种现象和运行规律之间的必然联系.     

浅谈单轨转向架跑合试验台变频器方案设计

通过分析单轨转向架地面跑合试验特点，并根据该转向架跑合试验的具体速度等级要求，通过对车速与电机转速以及车速与变频器输出频率之间的关系换算，具体提出了单轨转向架跑合试验台变频器的设计方案。     

利用∨型三能级原子与相干态光场的Raman相互作用实现类自旋的腔场GHZ态

在大失谐条件下，利用简并V型三能级原子与相干态光场的Raman相互作用，提出了一种实现类自旋的腔场Greenberger—Horne—Zeilinger(GHZ)态的新方案。     

Chemical states of the atoms in magnetic multilayersTa/NiOx/Ni81Fe19/Ta and Co/AlOx/Co

Ta/NiOx/Ni81Fe19/Ta and Co/AiOx/Co multilayers were prepared by rf reactive and dc magnetron sputtering. The exchange coupling field (Hex) and the coercivity (Hc)of NiOx/Ni81Fe19 as a function of the ratio of Ar to O2 during the deposition process were studied. The composition and chemical states at the interface region of NiOx/NiFe were also investigated using the X-ray photoelectron spectroscopy (XPS) and peak decomposition technique. The results show that when the ratio of Ar to O2 is equal to 7 and the argon sputtering pressure is 0.57 Pa, the x value is approximately 1and the valence of nickel is +2. At this point, NiOx is antiferromagnetic NiO and the corresponding Hex is the largest.As the ratio of Ar/O2 deviates from 7, the Hex will decrease due to the presence of magnetic impurities such as Ni+3 or metallic Ni at the interface region of NiOx /NiFe, while the Hc will increase due to the metallic Ni. Al layers in Co/AIOx/Co multilayers were also studied by angle-resolved XPS. Our finding is that the bottom Co could be completely covered by depositing an Al layer about 1.8 nm. The thickness of AIOx was 1.2 nm.     

Chemical states of the atoms in magnetic multilayers Ta/NiO x /Ni81Fe19/Ta and Co/AlO x /Co

Ta/NiO _x /Ni₈₁Fe₁₉/Ta and Co/AlO _x /Co multilayers were prepared by rf reactive and dc magnetron sputtering. The exchange coupling field (H _ex) and the coercivity (H _c) of NiO _x /Ni₈₁Fe₁₉ as a function of the ratio of Ar to O₂ during the deposition process were studied. The composition and chemical states at the interface region of NiO _x /NiFe were also investigated using the X-ray photoelectron spectroscopy (XPS) and peak decomposition technique. The results show that when the ratio of Ar to O₂ is equal to 7 and the argon sputtering pressure is 0.57 Pa, the x value is approximately 1 and the valence of nickel is +2. At this point, NiO _x is antiferromagnetic NiO and the corresponding H_ex is the largest. As the ratio of Ar/O₂ deviates from 7, the H _ex will decrease due to the presence of magnetic impurities such as Ni⁺³ or metallic Ni at the interface region of NiO _x /NiFe, while the H _c will increase due to the metallic Ni. Al layers in Co/AlO _x /Co multilayers were also studied by angle-resolved XPS. Our finding is that the bottom Co could be completely covered by depositing an Al layer about 1.8 nm. The thickness of AlO _x was 1.2 nm.     

J-C模型中原子的自发辐射与量子纠缠态

通过对旋波近似下J－C模型中的二能级原子与单模场相互作用体系的研究，得到激发态原子将演化为场和原子的耦合叠加态－－纠缠态，原子偶极矩的期待值总是零，但偶极矩的起伏恒等于一个不为零的常数，因此，原子的自发辐射是由偶极矩的涨落引起的，并非原子偶极矩振荡造成的结果，具体研究这种纠缠态的性质得出：原子与场纠缠体系的信息熵和纠缠度随时间做周期性的振荡，并且和原子与场间的耦合系数及失谐程度有关，量子态在非纠缠态与纠缠态之间变化，在微小失谐量时，量子态将长时间停留在纠缠态。     

二能级原子与位相相干态光场的相互作用及跃迁几率

运用J－C模型研究了二能级原子与位相相干态光场的相互作用，以及光场－原子体系内部状态间的跃迁几率。     

数据库应用系统的运行效率探讨

介绍了在典型的C／S结构数据库应用系统中运行效率的研究，从数据下载，视图的使用，索引的建立、SQL语句的书写等方面进行了分析，实施对数据库应用系统的优化工作，提出了整个数据库系统的运行效率。     

光腔中光子数态的形成

以单光子跃迁Ｊ－Ｃ模型为基础研究了大量激发态原子逐个穿越光腔后，腔内光场统计分布的变化特性，给出了纯光子数态的形成条件及光场的挤压效应的一般规律。腔场稳定时，出射原子保持其入射时的激发状态