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Daily 24-hour PM 2.5 samples were collected continuously from January 1 to December 31, 2010. Elemental concentrations from Al to Pb were obtained using particle induced X-ray emission (PIXE) method. This was the first full year continuous daily PM 2.5 elemental composition dataset in Beijing. Source apportionment analysis was conducted on this dataset(More)
A simple connected graph G is said to be interval distance monotone if the interval I (u, v) between any pair of vertices u and v in G induces a distance monotone graph. Aïder and Aouchiche [Distance monotonicity and a new characterization of hypercubes, Discrete Math. 245 (2002) 55–62] proposed the following conjecture: a graph G is interval distance(More)
In this paper, we consider the Cauchy problem for the Laplace's equation in a rectangle, where the Cauchy data is given for y = 0 and boundary data are given for x = 0 and x = π. The solution is sought in the interval 0 < y ≤ 1. A modified method is presented and error estimate is obtained. Combining the method of modified, we(More)
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