Based on the data of oil concentration in the water and sediment monitored in Yangtze Estuary and adjacent waters during spring and summer of 2006,the distributional feature of petroleum hydrocarbon in water and sediment during different seasons were analyzed,the pollution degree was assessed with single index.

According to the investigational data of oil content in water and sediment in spring and summer from 2000 to 2003 in Changjiang Estuary and adjacent waters, the distributional character and pollution degree of oil of the investigational sea area were studied with single index method.

We extend the generalized harmonic series sum from n=1 to ∞ 1/n~x into a class of exponential terms series sum from n=1 to ∞ a_nd_n~x.

On the zeros of some second degree exponential polynomials;

This result of oscillator deaths is based on a necessary and sufficient condition, under which all roots of a class of exponential polynomials have negative real parts.

In this paper we develop a novel approach to construct non-stationary subdivision schemeswith a tensor control parameter which can reproduce functions in a finite-dimensionalsubspace of exponential polynomials.

In this dissertation, the mean value of some famous summations including character sums over a short interval, two-term exponential sums with Dirichlet character, Cochrane sums, Kloosterman sums and their.