纳米弹性复合DLC薄膜的制备及其摩擦性能研究

利用磁过滤阴极真空弧沉积系统在硅片及以硅片为基底的2种弹性体材料表面沉积厚度为2.7 nm的DLC膜,采用原子力显微镜和拉曼光谱仪对薄膜的形貌及成分进行分析,用纳米力学测试系统测量薄膜的弹性模量和硬度,用UMT-2型多功能微摩擦磨损试验机考察其摩擦性能.结果表明,以γ-缩水甘油醚氧丙基三甲氧基硅烷(187)为偶联剂的薄膜试样表面比以γ-氨丙基三乙氧基硅烷(APS)为偶联剂的薄膜试样表面更致密且粗糙度更低,薄膜的最上层为DLC膜.在硅表面沉积DLC薄膜可以显著降低其表面的摩擦系数(0.117～0.137),在低载荷条件下,含偶联剂及弹性体的DLC薄膜的摩擦系数低于硅表面沉积DLC的薄膜,且以187为偶联剂的薄膜试样的摩擦性能更佳;在高载荷条件下,硅表面沉积DLC的薄膜具有更优异的摩擦性能.     

平行催化氢波法测定非甾体抗炎药尼美舒利

尼美舒利;过二硫酸钾;催化氢波;平行催化氢波     

定域密度泛函理论对金刚石(100)面再构的研究

用定域密度泛函理论和数值基的方法,进行电荷自洽的总能计算。采用一个集团模型(C₄₉H₃₆)模拟C(100)表面,研究其再构的情况。根据表面原子上受力的计算,得到优化的表面碳原子的几何结构、表面碳原子成对二聚化的成键性质、优化键长(1.415?),以及相应的电子能态结构、表面态的分布等性质。     

工作在可见和紫外波段的自由电子激光器

Madey指出用直线加速器,限制了电子束束流密度,使得自由电子激光器可能达到的短波长极限为1μm左右。本文提出利用自由电子激光器的高次谐波运转,用直线加速器可望获得可见和紫外波段的短波长激光。实现自由电子激光器高次谐波运转的关键是建立高K值的Wiggler磁场。     

稀土金属间化合物CeSn3和CeIn3的能带理论

本文报道了CeSn₃和CeIn₃的能带计算结果。对其f电子的行为,以及f电子与非f原子的s,p,d电子之间的杂化进行了讨论。分析了费密能级附近的态密度分布及能带结构。 关键词：     

ε-己内酯在引发剂La(OAr)3作用下的开环聚合特征--用正交试验法探讨最优聚合条件

用三(2,6-二叔丁基—4—甲基苯氧基)镧[La(OAr)3]引发ε—己内酯(CL)的开环聚合,用正交试验方法探索了ε—己内酯在该引发剂下开环聚合的最优条件。两组正交实验结果表明,最佳转化率的反应条件分别为t=20℃,t=50min,c(CL)=0．6mol／L,n(CL)／n(La)—1000和t=30℃,t=30min,c(CL)=0．7mol／L,n(CL)／n(La)=1000,DSC分析结果表明,聚合物的结晶度为50％以上。     

多复变函数论中的一组偏微分方程的解的拓展性与解的中量性质

本文主要要讨论多复变函数论中的一组偏微分方程，讨论此方和组的解的拓展性及解的中量性质。     

SYNTHESIS AND CHARACTERIZATION OF Co(Ⅱ) COMPLEX OF 14-MEMBERED HEXAAZA MACROCYCLIC LIGAND WITH AXIALLY COORDINATED BROMIDES

The macrocyclic ligand complex, [Co(C_(18)H_(18)N_6) Br_2]·1/2H_2O, has been synthesized by the template condensation of 2, 6-diacetylpyridine with hydrazine in the presence of cobalt (Ⅱ) dibromide and characterized by IR, ESR, electronic spectra and magnetic properties. Based on these data, the complex is proposed to be an approximate elongated octahedron with low spin state. The absorption bands of d-d transition are assigned, and the values of various ligand field parameters have been evaluated and are discussed in terms of their chemical utilities. ESR study on the complex has been carried out. The values of g(?)and g(?) have been determined. From ligand field parameter values and gvalues, μ_(eff)=2.06 BM has been obtained, which is consistent with the experimental value(2.04BM).     

Ni-Mg,Mg-Mn和Ni-Zn三种铁氧体在3厘米波段的法拉第旋转及衰耗

Faraday rotation and loss characteristics at 9200 me and at room temperature of Ni-Mg, Mg-Mn and Ni-Zn ferrite rods and disks placed in a circular waveguide are measured as a function of applied longitudinal DC magnetic field.Of particular interest are the results obtained with a new type of Ni-Mg ferrites, since very little data on Ni-Mg ferrites have been published in the literature. In this paper sufficient data are given on Faraday rotation and loss characteristics of a complete range of nickel-magnesium ferrites with composition varying from pure nickel to pure magnesium. Experimental results at 9200 me indicate that for the sintering temperature of 1300℃, the best composition range for nickel-magnesium ferrites would be Ni_0.7Mg_0.3Fe₂O₄-Ni_0.8Mg_0.2Fe₂O₄. In future, nickel-magnesium ferrites, due to their very low loss, may find practical applications in the microwave field.Comparison information as to the relative merits of these three useful microwave ferrites are given in the form of curves and tables, and their results are discussed in some detail.This paper also gives a summary of the linear theory on Faraday rotation of a linearly polarized wave propagating in ferrite-loaded waveguide which is longitudinally magnetized.     

金属铝在半导体表面的吸附

本文采用集团模型,用自洽的EHT方法计算金属Al在Si(111)和GaAs(110)面上吸附的稳定的几何构型和电子态,结果表明,Al在Si(111)面的三度开位上的离子吸附比顶位的共价吸附更稳定,态密度与实验符合也更好,Al吸附在GaAs(110)面上,将取代表面Ga原子,形成AlAs,此时GaAs(110)面将恢复到不弛豫的理想位置。 关键词：