In this paper, we determine spectral stability results of periodic waves for the critical Korteweg-de Vries and Gardner equations. For first equation, show that both positive zero mean traveling wave solutions possess a threshold value which may provides us rupture in stability. Concerning second establish existence using Galilean transformation on cnoidal solution modified equation equations, ...

We have observed the nuclear region of an edge-on spiral galaxy NGC 5793 with VLBI in order to determine the morphology of the central continuum source at 6 and 18 cm and the distribution of OH molecular gas at 18 cm on parsec scales. NGC 5793, with a type 2 Seyfert nucleus, is known to have peculiar H2O maser features in its center, indicating the presence of a rotating disk/torus (Hagiwara et...

The amphipod Monoporeia a&is (LindstrGm) exhibits long-term population oscillations in oligotrophic Lake V&tern. Correlation showed profundal oxygen and temperature, and intraspecific and predatory interactions to be poor explanatory variables. Conversely, the interannual variability in food availability-diatom biovolumewas highly correlated with amphipod total density at t + 1 yr and the densi...

-Cylindrical traps with an aspect ratio of 5.2 were tilted from 0 ° to 70 ° upstream and downstream in the Hudson River with currents ranging between 2 and 62 cm s -~. Particle flux in the tilted traps increased with tilt up to about 45 ° where overcollection reached a maximum factor of three but decreased beyond 45 ° when traps were tilted downstream. There was no discernible velocity effect o...

CMOS gas sensors for healthcare Julian Gardner University of Warwick

Existing stochastic models of unsaturated flow and transport are usually developed using the simple Gardner-Russo constitutive relationship though it is generally accepted that the more complex van Genuchten and Brooks-Corey relationships may perform better in describing experimental data. In this paper, we develop first-order stochastic models for gravity-dominated flow in second-order station...

The Floreana Mockingbird (Mimus trifasciatus) is one of the rarest bird species in the world, with an estimated 550 individuals remaining on two rocky islets off the coast of Floreana, Galápagos, Ecuador, from which the main population was extirpated more than 100 yr ago. Because they have been listed in critical danger of extinction, a plan to reintroduce this species to Floreana has been init...

Early stochastic studies focused on steady-state, gravity-dominated unsaturated flow in unbounded domains In this study, on the basis of the van Genuchten–Mualem constitu(e.g., Yeh et al., 1985a,b; Russo, 1993, 1995a,b; Yang et tive relationship, we develop a general nonstationary stochastic model for transient, variably saturated flow in randomly heterogeneous meal., 1996; Zhang et al., 1998; ...