磁控反应溅射氧流量变化对TiO2薄膜影响的实验研究

通过中频交流磁控溅射设备,利用金属Ti靶制备出了有一定厚度的、质量较好的TiO2薄膜,TiO2薄膜被沉积在玻璃基底上.利用各种分析测试手段对其性能进行了测试,初步探讨了不同氧流量对TiO2薄膜的影响.实验表明,不同氧流量下制备的TiO2薄膜的亲水特性发生了变化.     

掺杂浓度对中频反应磁控溅射制备Al2O3:Ce3+薄膜发光性能的影响

应用中频反应磁控溅射设备在载玻片上制备掺铈的Al2O3薄膜,在固定的电源功率下,氩气流量为23sccm,氧流量为5sccm,室温下溅射时间为90min的条件下,通过控制薄膜中的Ce^3＋离子的掺杂量来改变薄膜的发光性能。通过X光能量散射谱（EDS）和光致发光测量,得到发光强度和发光峰位对薄膜中的Ce^3＋浓度有强烈的依赖关系,并且分析了产生这种关系的原因;对发光激发谱分析表明,薄膜发光是源于薄膜中形成的氯化铈集合体中的Ce^3＋。Al2O3：Ce^3＋发光膜可应用于需要蓝光发射的平板显示领域．     

An improved snare system for the nonsurgical retrieval of intravascular foreign bodies

We have modified a snare technique originally described for transcolonoscopic removal of colonic polyps for the retrieval of intravascular foreign bodies. The key difference from other snare techniques is the employment of a wire snare with a crimp in its midportion that enables the formation of a loop in a plane perpendicular to the axial direction of the guiding catheter. With this technique we have quickly removed a variety of objects from the right heart and pulmonary arteries in four patients.     

Electrophysiologic analysis of the representation of the somatosensory system in the dogfish midbrain tectum

Evoked responses in the dogfish tectum opticum were studied during electrical stimulation of the spinal cord, its dorsal roots and ramus ophthalmicus of the facial nerve. Recordings were obtained from different depth as well as from different points on the tectum surface. Evoked responses could be detected mainly on the contralateral side of the tectum opticum either as slow positive (spinal cord stimulation) or negative-positive (facial stimulation) waves which were preceeded by one or two fast, probably, presynaptic deflections and followed by a very slow low-amplitude negative wave. The evoked responses possessed the properties of tectal postsynaptic responses, being somatotopically distributed on the surface and reversely represented in the inner part of the tectal lamina. Projections of different inputs were widely overlapped, but specific areas of maximal activity were presented. These findings evidence that the tectum opticum performs a double function: a primary projecting and an integrative centre.     

First-order reliability analysis employing translation systems

A reliability analysis is described in which sample moments are used to transform the design parameters to a space in which they have a multivariate normal distribution. The technique can be rendered quite simple by the use of tabulated data. The analysis then proceeds to generate failure risk estimates based on regions of estimated probability content or on statistical tolerance regions in the normal parameter space. A particularly useful Bayesian analysis based on the multivariate normal distribution is also described.     

Separation of the proteins of egg white and egg yolk and a study of their interactions in whole egg. I. Quantitative fractionation of proteins

Procedures developed for the fractionation and sub-fractionation of proteins in whole egg have been applied to separated white and yolk samples and to whole egg reconstituted from them. The fractionation pattern of whole egg soluble proteins on diethylaminoethylcellulose differed from a simple combination of the corresponding patterns for white and yolk soluble proteins. All the fractions and sub-fractions were dialysed and freeze-dried for analysis. The main effect of mixing yolk with white appears to be the conversion of some insoluble lipoproteins to a soluble form, the bulk of which has no affinity for diethylaminoethylcellulose but can be separated by chromatography on car-boxymethylcellulose into a number of fractions that have high lipid contents and are clearly derived from the low density fraction of yolk.