保险精算中的一个随机模型

本文假设投保人到达保险公司的过程是一个强度为λ（ｘ）的非齐次Ｐｏｉｓｓｏｎ 过程、在时间区间（０,ｔ］中的索赔额是一个与保险规则及在（０,ｔ］中的投保人数有关的随机变量,提出一个新的保险精算模型,获得保险公司在（０,ｔ］中盈余额的一些数字特征．经典的个体模型和短期聚合风险模型均为本模型的特殊情形．     

红外光谱法测定废水中石油类

通过对标准油样扫描的红外光谱特征吸收峰先进行定性分析,然后以特征吸收峰高进行定量分析,建立了用红外光谱法测定废水中石油类的方法,并以不同浓度的标准及考核油样进行了试验性测定,取得了满意的效果。     

Graph theoretical procedures for determination of eigenspectra of molecular graphs: A brief review

Several graph theoretical procedures for obtaining eigenvalues of π-conjugated molecules have been discussed. Procedures for generation of characteristic polynomial corresponding to a molecular graph and its subsequent solutions for obtaining graph eigenspectra have been mentioned briefly. Moreover discussions on Laplacian and distance polynomials that offer more physico-chemical information already not present in the characteristic polynomial have also been carried out shortly.