Potential Dependence of the Raman Spectra and the Study of Adsorption Model for 4, 4-Bipyridine on A Silver Electrode

The study of the adsorption properties and adsorption model of molecules or ions on substrates is an important part of surface enhanced Raman scattering (SERS) experimental investigations. In this paper, we will present the findings of our research work with regard to the potential dependence of the SERS spectra for 4, 4' -bipyridine (bpy) on the silver electrode and the adsorption model for bpy adsorbed on the silver electrode surface. We find the intensities of the SERS spectra with all Raman shifts can be changed by changing the applied potentiat and reach maxima when the applied potential is ca. -0.70 V (Vs. SCE). The experimental study also indicates that the pyridine ring of bpy adsorbs directly on the silver electrode surface via the N-atom.     

数学规划在函数值估计中的一个应用

利用数学规划方法，对函数值进行估计，由简单具体的求函数值范围的例子出发，并把问题深化、提升为如何用数学规划的方法来估计一般函数的取值范围。     

双辉渗金属高速钢的研究

利用中国独创的双层辉光离子渗金属技术，在普通低碳钢及低合金钢表面渗入所需合金元素，再经渗碳，形成具有高速钢成分的渗层，即在钢的表面形成高速钢，称为双层辉光离子渗高速钢（简称双辉渗高速钢）。由于这是一种固态冶金法，没有由于结晶而形成的粗大一次碳化物，合金层中的碳化物细小且分布均匀，避免了传统的冶炼、锻轧高速钢生产中难以克服的碳化物不均匀问题。合金元素供给源采用粉末冶金法制成，可根据实际需要调整其组分配比，从而获得一系列具有不同成分的高速钢渗层     

Minimum variance pooling of forecasts at different levels of aggregation

The most common approach to combining forecasts at different levels of aggregation has been to sum (or average) the more disaggregated forecast, and take a weighted average of the aggregate forecasts. This paper develops a simple method for obtaining minimum variance pooled forecasts at the disaggregated level. The major advantage that this method has over the common approach is that it provides pooled forecasts at both the aggregated and disaggregated level. As will be shown, the resulting aggregate pooled forecast is identical to the forecast which would be obtained by simply pooling two forecasts at the aggregate level, while the disaggregated forecast maintains the aggregation identity required by the problem.