纳米硅薄膜中量子点的库仑阻塞效应

用纳米硅薄膜制成了共振隧穿量子点二极管，在77K温度下对其I－V特性进行了测量，得到了具有共振隧穿特征的实验结果。对实验结果分析表明，纳米尺寸晶粒构成的量子点具有库仑阻塞效应。     

B_4C在铁基摩擦材料中的作用及机理

通过X射线衍射相分析、光电子谱分析及金相分析等手段，对B4C在铁基摩擦材料中的作用及机理进行了研究，结果表明，B4C在铁基摩擦材料加压烧结过程中能与铁发生反应，生成一种新相Fe2B．在摩擦磨损过程中，加入的B4C并没有直接起到摩擦组元的作用，而是通过生成的Fe2B起作用．在一般负荷工作条件下，Fe2B主要起摩擦组元的作用；在重负荷工作条件下，Fe－Fe2B共晶体起润滑组元的作用．     

pH effect of· OH radical induced oxidation of phosphoryl- methionine in aqueous solution

Conclusion The results of pulse radiolytical research on the · OH radical-induced oxidation of NDM in aqueous solution demonstrate that pH value has a great influence on the radiolytical mechanism of NDM. At low pH value, the product is mainly stabilization of the oxidizing sulfur centre in the three-electron-bonded cation radical NDM₂ ·⁺ [S]; with the increase of pH value, NDM₂ ·⁺ [S] gradually decays to become the reducing α-amino radical which was verified by the chemical method and whose yield was also calculated. Compared with Met₂ ·⁺ [S] produced by the · OH radical-induced oxidation in aqueous solution [1], the stability of NDM₂·⁺ [S] increases and the yield of α-amino radical decreases. This suggests that the introduction of phosphoryl group has a coordinating effect on the radioprotection of methionine to biological systems, and provides the essentially theoretical foundation for the thorough clarification of the reversible phosphorylation of proteins.     

The strong cooperativity of dioxygen binding by dicobalt (II) diporphyrin compounds in nonaqueous solution at room temperature

Thermodynamic data were determined for the reversible binding of O₂ to two compounds of dicobalt(II) di(meso-tetra-phenyl)porphyrin derivatives with different lengths of diamidoaliphatic bridge (abbreviated to Co₂PP₈ and Co₂PP₄) in N,N-dimethylformamide at room temperature. The partial pressure of dioxygen necessary for half-oxygenation (P _1/2) and hill coefficient (n) at 298 K were determined as follows:P _1/2=54.2 kPa,n=2.0 for Co₂PP₈ andP _1/2=6.8 kPa,n=1.8 for Co₂PP₄, respectively. The rate equations of reversible oxygen binding by Co₂PP₈ were determined and the reaction path was proposed. The results of ther-modynamic and kinetic studies indicate that there exists strong cooperative effect during oxygenation of the compounds. The ESR observation reveals that the dioxygen complexes formed in the solutions are of superoxo (Co-O ₂ ⁻ ) type. Supported by the Research Foundation of the State Education Commission of China Zhou Xiaohai: born in 1962, Ph.D. Associate professor     

热流模型半导体方程组的光滑解

考虑具热效应的半导体方程组的初边值问题，应用Ｓｃｈａｕｄｅｒ不动点原理和先验估计方法，证明了该问题整体光滑解的存在唯一性。     

多效唑对幼年桃树生长发育的影响

多效唑施于土壤中，对雨花露桃的营养生长有明显的抑制作用，但能增加叶绿素含量，促进成花，改变果形指数；在蟠桃上叶面施多效唑对其营养生长和生殖生长影响不明显，但明显地改变果形指数。土壤的最佳处理浓度为０．８ｇ／ｍ＾２。     

HDEHP萃取Zn(Ⅱ)的稀释剂效应

考察了ＨＤＥＨＰ在不同稀释剂中对Ｚｎ（Ⅱ）的萃取平衡，探讨了萃取平衡常数与稀释剂性质间的关系，建立了平衡常数与稀释剂极性参数（ＤＰ和Ｓ）间的经验方程．求得萃合物ＺｎＡ２·２ＨＡ的溶解度参数为１６．５Ｊ１／２．ｃｍ－３／２．