rhelogical properties of mucilage extracted from garden cress (lepidium sativum l.) seeds as influenced by gum concentration (0.4, 0.6, 0.8 and 1.0 % w/w), temperature (5, 25 and 40 ?c), as well as ph (2.5, 4, 7 and 10) were investigated. non-newtonian shear thinning flow behavour was observed with the power law model well describing the rheological behavior of the solutions. increasing the sol...

The subject of angular momentum transport is important in theories concerning accretion disks. The αmodel of Shakura and Sunyaev1) assumes outward transportation of angular momentum due to some viscous force. This viscosity is believed to originate from turbulence, because the molecular viscosity is far too small in this case. Because the viscosity formula for turbulence is not well known, gene...

Rheological studies were carried out on solutions of zein in N,N-dimethylformamide (DMF), where the specific lot of zein, concentration, time, and temperature were varied. DMF is a good solvent for zein, giving clear, relatively low viscosity solutions. It was found that all of the zein solutions behaved in a non-Newtonian fashion. At high concentration and elevated temperature, zein solutions ...

One of the most interesting applications of photopolymers is as holographic recording materials for holographic memories. One of the basic requirements for this application is that the recording material thickness must be 500 microm or thicker. In recent years many 2-dimensional models have been proposed for the analysis of photopolymers. Good agreement between theoretical simulations and exper...

Interesting and exotic surface wave patterns have regularly been observed in the Faraday experiment. Although symmetry arguments provide a qualitative explanation for the selection of some of these patterns (e.g., superlattices), quantitative analysis is hindered by mathematical difficulties inherent in a time-dependent, free-boundary Navier-Stokes problem. More tractable low viscosity approxim...

Aaron J. Schmidt, Matteo Chiesa, Darius H. Torchinsky, Jeremy A. Johnson, Avid Boustani, Gareth H. McKinley, Keith A. Nelson, and Gang Chen Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Department of Physics Massachusetts, Institute of Technology, Cambridge, Massachusetts 02139, USA Department of Chemistry Massachusetts, Institu...

We study the dynamics of successive slip events at a frictional interface with finite-element simulations. Because of the viscous properties of the material, the stress concentrations created by the arrest of precursory slip are not erased by the propagation of the following rupture but reappear with the relaxation of the material. We show that the amplitude of the stress concentrations follows...

In this work we consider viscosity solutions to second order partial differential equations on Riemannian manifolds. We prove maximum principles for solutions to Dirichlet problem on a compact Riemannian manifold with boundary. Using a different method, we generalize maximum principles of Omori and Yau to a viscosity version.

We study a single risky financial asset model subject to price impact and transaction cost over an infinite horizon. An investor needs to execute a long position in the asset affecting the price of the asset and possibly incurring in fixed transaction cost. The objective is to maximize the discounted revenue obtained by this transaction. This problem is formulated first as an impulse control pr...

The shear viscosity of a two-dimensional (2D) liquid was calculated using molecular dynamics simulations with a Yukawa potential. The viscosity has a minimum at a Coulomb coupling parameter Gamma of about 17, arising from the temperature dependence of the kinetic and potential contributions. Previous calculations of 2D viscosity were less extensive as well as for a different potential. The stre...