No abstract

A method and apparatus have been developed for the quantitative observation of infrared streaming dichroism of solutions of macromolecules, The design, construction, and operation of the apparatus are described in detail. The apparatus consists of a modified standard infrared liquid c~ll through which the solution is pumped by means of a pair of hypodermic syringes which are driven in opposition by a pair of cams that provide a constant rate of displacement. The resulting flow is constant except for a reversal in direction at the end of each stroke. The maximum value of the gradient in the cell may be calculated by means of a simple formula. The total volume of the pump and cell is 2,2 cc so that small samples may be measured, Several types of materials have been measured and a typical result is shown,

This paper presents an a posteriori approach to unstructured mesh generation via a localized truncation error analysis and applies it to the Western North Atlantic Tidal (WNAT) model domain. The WNAT model domain encompasses the Gulf of Mexico, the Caribbean Sea, and the North Atlantic Ocean east to the 60° W meridian. In this paper, we focus on the area surrounding the Bahamas.A bathymetric data set with fine resolution is employed in separate linear, harmonic simulations of shallow water tidal flow for seven different tidal-forcing constituents. Each set of simulation results is used to perform a truncation error analysis of a linear, harmonic form of the depth-averaged momentum equations for each of the different tidal-forcing frequencies. The process has been built upon successful research aiming to produce unstructured grids for large-scale domains that can be used in the accurate and efficient modeling of shallow water flow. The methodology described herein can also be transferred to other modeling applications.