An implicit pressure and explicit saturation (IMPES) finite element method (FEM) incorporating a multi-level shock-type adaptive refinement technique is presented and applied to investigate transient two-phase flow in porous media. Local adaptive mesh refinement is implemented seamlessly with state-of-the-art artificial diffusion stabilization allowing simulations that achieve both high resolut...

A group, according to the American Heritage Dictionary, is an assemblage of persons or objects gathered or located together. In a social context, this usually implies a shared psychological goal or physical state, and in the real world, often both. The set of students in the Sociable Media Group at the MIT Media Laboratory is such a group, sharing the academic goal of studying social interactio...

We present a theoretical and experimental study of the propagation, decay, and interaction of optical vortices in media with an anisotropic nonlocal nonlinearity. The initial stage of decay of a circular vortex is characterized by charge dependent rotation, and stretching of the vortex. Our results suggest that a compact vortex of unit topological charge cannot exist in such media, but that a c...

Leaves from in vitro proliferating shoots of cvs. Chandler and Hartley of Persian walnut were cultured on MS and NN media supplemented with BA and NAA. Three light conditions including darkness, low light intensity and modified light intensity were used. Most of the calli were friable and non-embryonic in all three conditions. Rate of callogenesis depended on cultivar, culture medium, light con...

there are two different contradictory approach regarding the interaction of the state immunity and jus cogens. some jurist argue that jus cogens rules should prevail over other inconsistent ordinary rules of international law including state immunity. this argument therefore depends upon the existence of conflict between rules of jus cogens, and the rule of customary law which requires one stat...