铝(210)表面的LEED,AES研究

采用低能电子绕射(LEED)和俄歇电子能谱(AES)的方法,研究了铝(210)表面的弛豫和表面结构。按多童散射理论,使实验测得的和计算的LEED谱有较好的吻合。结果表明:铅(210)表面的弛豫仲展至表面五个原子层,且垂直于表面的驰豫较平行于表面的弛豫显著得多。最后用静电模型对这些结果进行了讨论。     

建筑卷扬机卷筒端侧板强度的理论分析与试验研究

本文依据理论分析、光弹性试验、电测试验并经数学拟合,建立了卷扬机卷筒端侧板强度计算公式.     

列修正拟Newton法在并行算法中的应用

本文利用解非线性方程组的列修正拟Newton法给出了常微分方程数值解法中的Adams内插公式的并行计算方法,并证明了该方法的收敛性     

三氮烯类化合物作为酸碱指示剂的研究及应用

本文报道了三氮烯类化合物作为酸碱指示剂的研究及应用.以我们新近合成的此类试剂之一——2-氯一4一硝基苯基重氮氨基偶氮苯为研究主要对象,分别讨论了有无表面活性剂存在、以及不同类型表面活性剂存在下,试剂的离解常数及变色区域.在TritonX-100存在下,其试剂的pKa=9.25±0.01,变色区域为pH8.40(黄)～10.0(紫);在CTMAB存在下,pKa=7.35士0.03,变色区域pH6.85～7.90;在混合表面活性剂TritonX-100-CTMAB存在下,pKa=8.20±0.05,变色域pH7.45～9.00(黄～紫).特别是在阳离子表面活性剂存在下,滴定终点颜色变化十分敏锐清晰,是一种优于酚酞和甲基橙的指示剂.最后并对此类试剂与表面活性剂的相互作用作了简单探讨.     

组合逻辑电路的无反变量输入设计

本文阐述了组合逻辑电路无反变量输入的设计思想，并通过设计实例给出了具体的设计方法与步骤．     

碳酸钕对AZ91合金组织的细化和腐蚀性能的影响

通过介绍实验条件实验方法及结果,并对其进行讨论,研究碳酸钕对A291合金组织的细化和腐蚀性能的影响。     

Intramammary expression and therapeutic effect of a human lysozyme-expressing vector for treating bovine mastitis

To develop a gene therapy strategy for treating bovine mastitis, a new mammary-specific vector containing human lysozyme (hLYZ) cDNA and kanamycin resistance gene was constructed for intramammary expression and clinical studies. After one time acupuncture or intracisternal infusion of healthy cows with 400 μg of the p215C3LYZ vector, over 2.0 μg/ml of rhLYZ could be detected by enzymatic assay for about 3 weeks in the milk samples. Western blotting showed that rhLYZ secreted into milk samples from the vector-injected cows had molecular weight similar to that of the natural hLYZ in human colostrums. Twenty days after the primary injection, the quarters were re-injected with the same vector by quarter acupuncture and even higher concentrations of rhLYZ could be detected. Indirect competitive ELISA of milk samples showed that the vector injection did not induce detectable humoral immune response against hLYZ. Clinical studies showed that twice acupuncture of quarters with the p215C3LYZ vector had overt therapeutic effect on clinical and subclinical mastitis previously treated with antibiotics, including disappearance of clinical symptoms and relatively high microbiological cure rates. These data provide a solid rationale for using the vector to develop gene therapy for treating bovine mastitis.     

PRELIMINARY STUDY ON RETRO-REFLECTIVE COATED PAPER BASED ON MICROGLASS BEADS

INTRODUCTIONThe micro-glass bead[1-2] is a new kind of silicate material, with good properties of chemical stability, mechanical strength as well as electro-resistance. When its diameter is below 0.08mm and the reflective index is in the range of 1.9~2.1, retro-reflective characteristics can be achieved. When a beam of ray from any direction irradiates the surface of the micro-glass beads, it can be converged at the special reflective layer consisted of focuses of micro-glass beads, owing …     

美国五次并购浪潮及其历史背景

美国历史上曾发生过五次大的并购浪潮，对这段历史进行研究，对于进一步加强对我国并购活动管理工作具有重要的指导意义。     

探索学生学习效能的提高--兼数学教学活动

学生学习效能差异很大，这和内外因的各种因素有关，文章着重激发学生学习中的内驱力和教师教学方法等外驱力的作用展开探讨．