反复上呼吸道感染患儿发样微量元素锌,铜,铁检测结果分析

采用示波极谱法对１８３名反复上呼吸道感染患儿及１１８名健康体检儿同时进行发样锌，铁，铜测定，结果表明，反复上呼吸道感染儿发锌，铁均低于健康体检儿，有高度显著性差异，铜只在婴儿组反复感儿高于健康体检儿，其它各年龄组反复上感儿低于健康栓检儿或无显著性差异，说明以２儿童进行常规发样微量元素普查，发现低锌，低铁者及时给予补充，可减少感染性疾病的发生率。铜与免疫功能的关系尚待研究。     

巯基乙酸锑(Ⅲ)配合物合成与晶体结构

以三氧化二锑和巯基乙酸在水溶液中反应合成了配合物HSb(SCH2COO)2,并通过元素分析、红外光谱、X射线粉末衍射进行了表征,利用单晶X射线四圆衍射法测定了晶体结构,结果表明该配合物晶体属于单斜晶系,C2/c空间群,晶胞参数为:a=1.40005(8)nm,b=1.19121(8)nm,c=1.23588(8)nm,β=126.822(1)°,V=1.6499(2)nm^3,Dc=2.439g·cm^-3,Z=8,R1=0.0250。并对X射线粉末衍射数据进行了指标化,其结果与单晶数据吻合。     

红外光谱法对六氟磷酸锂的快速定量分析

本文建立了一种用傅里叶红外光谱(FT-IR)法快速定量分析LiPF6的方法。采用红外光谱(IR)法和X射线衍射(XRD)法对LiPF6样品进行了定性分析。选取LiPF6红外光谱847cm-1处的特征吸收峰为分析对象,利用吸光度峰面积积分法进行定量分析,由标准曲线可知,LiPF6的含量与其红外光谱特征峰的吸收强度有很好的线性关系,相关系数达0.9998,线性范围在0.04～25mg.mL-1,检出限可达0.02mg.mL-1。LiPF6样品定量测定的相对标准偏差(RSD)约为0.18%,回收率为96%～98%。     

动边界量子含时谐振子系统的Lewis-Riesenfeld相位与Berry相位

根据Lewis-Riesenfeld的量子不变量理论,计算了一维动壁无限深势阱内频率随时间变化的谐振子的Lewis-Riesenfeld相位,发现刘登云文中“非绝热Berry相位”与Lewis-Riesenfeld相位中的几何部分完全一致.也许更为重要的是,证明了至少对于做正弦振动的边界,在绝热近似下,该系统不存在非零的Berry相位. 关键词： Berry相位 Lewis-Riesenfeld相位 量子不变量 动边界     

INTERLAYER EXCHANGE COUPLING IN COMPLEX MAGNETIC MULTILAYERS

We extend the hole confinement model of Edwards et al. to the problem of two kinds of complex magnetic sandwich structures. One is the magnetic sandwich covered on both sides by nonmagnetic films(case 1) and the other is that covered by magnetic films(case 2). The interlayer exchange coupling and the angular dependence of coupling energy in the two cases are investigated systematically. For case 1, our results show that the magnetic and outer nonmagnetic films influence significantly the oscillation behavior of exchange coupling and the appearance of noncollinear exchange coupling is very sensitive to the thickness of magnetic and outer nonmagnetic layers. Our results also show that the nonoscillatory component of the coupling generally varies with the thickness of magnetic(outer nonmagnetic) films and the results in the case where the thickness of both magnetic(outer nonmagnetic) films vary simultaneously are significantly different from that in the case where the thickness of one of the two magnetic(outer nonmagnetic) films is fixed while the other is varied, which is qualitatively in agreement with the experimental measurements. For case 2, the exponential dependence of exchange coupling on the thickness of the intermagnetic layer has been obtained, similar to the Parkin's experimental results for giant magnetoresistance.     

Tunneling magnetoresistance of the double spin-filter junctions at nonzero bias

A recent theoretical estimation indicated that the NM/FI/FI/NM double spin-filter junction (DSFJ, here the NM and FI represent the nonmagnetic electrode and the ferromagnetic insulator (semiconductor) spacer, respectively) could have very high tunneling magnetoresistance (TMR) at zero bias. To meet the requirement in research and application of the magnetoresistance devices, we have calculated the dependences of tunneling magnetoresistance of DSFJ on the bias (voltage), the thicknesses of ferromagnetic insulators (semiconductors) and the average barrier height. Our results show that except its very high value, the TMR of DSFJ does not decrease monotonously and rapidly with rising bias, but increase slowly at first and decrease then after having reached a maximum value. This feature is in distinct contrast to the ordinary magnetic tunnel junction FM/NI/FM (FM and NI denote the ferromagnetic electrode and the nonmagnetic insulator (semiconductor) spacer, respectively), and is of benefit to the use of DSFJ as a magnetoresistance device.     

关于Orlicz空间的-乘积问题

§1 引言与反例 王声望教授在中详细讨论了两个Orlicz空间的⊙-乘积问题。他在该文最后写道,对于-乘积问题“本文§1到§3的全部结论都是正确的,甚至在定理的叙述与证明的方法上都基本相同。”文§1的四个定理已总结在吴从炘,王廷辅的最新专著第三章§3.2中。我们将这四个定理逐一移植到-乘积问题时,发现只有前三个定理是可以按的说明移植的,即以下三个命题正确:     

面内磁场对硬磁泡形成的影响

实验研究了面内磁场对一次脉冲偏磁场作用下外延石榴石薄膜中硬磁泡形成的影响,发现存在一个使硬磁泡不再形成的临界面内磁场H_in⁰,它与材料参量有关,通过实验,运用面内磁场对条状畴的作用和枝状畴的形成,定性解释了软硬磁泡形成的分界场H_[b]随面内磁场增大、快降以及缓降这三个物理过程。 关键词：     

运用辩证思想探究解题途径

1 "正"与"反" 有些问题难以以正面突破时,从反面切人往往能找到简捷的通道.     

Existence and Upper Semicontinuity of.the Attractor for a Singularly PerturbedNavier-Stokes Equation

Suppose Rn, n = 2, 3 be a smooth bounded domain, we consider the perturbed NavierStokes equationThe study of this equation for ε= 0 has a long and rich history. In the two-dimensional case,the study is very successful and it is well known that the solutions of the equation define aC0-semigroup {S(t): t ≥ 0} in the space H = PL2 (where P is the projection onto thespace of divergence-free vector fields) and which has a global attractor Ac on H (see [1]). But,in the three-dimensional case, …