The modeling of spatio-temporal processes is crucial in many fields such as environmental science, hydrology, and water storage engineering. A basic concept the model an auto-covariance function. stream network based on Euclidean distance function for investigating river pollution will potentially face a serious accuracy problem, due to material or pollutant movement only occurring within trave...

The acquisition of definite articles has often been related to the acquisition of functional categories (see e.g. Radford, 1990; Clahsen, 1996; Penner & Weissenborn, 1996), since definite articles belong to the functional category (FC) D. Under this view, a problem that remains unsolved is why children pass through a stage in which they produce some definite articles, while at the same time the...

is called the continuous-time Lyapunov equation and is of interest in a number of areas of control theory such as optimal control and stability (Barnett, 1975; Barnett & Storey, 1968). The equation has a unique Hermitian solution, X, if and only if Xt + X~j ^ 0 for all i and j (Barnett, 1975). In particular if every Xt has a negative real part, so that A is stable, and if C is non-negative defi...