Purple membranes (PM) of the bacteria Halobacterium salinarum are a unique natural membrane where bacteriorhodopsin (BR) can convert photon energy and pump protons. Elucidating the electronic properties of biomembranes is critical for revealing biological mechanisms and developing new devices. We report here the electric properties of PMs studied by using multi-functional electric force microsc...

In this paper a novel computation model based on fine-grained objects and asynchronous procedure invocation is presented. Based on a set of only a few basic definitions it can be used to write well structured programs as well as exploit a large degree of potential parallelism. Yet the model is strong enough to express complicated subjects such as active objects and coordination patterns. By inc...

We present a new parallel PM N-body code named PMFAST that is freely available to the public. PMFAST is based on a two-level mesh gravity solver where the gravitational forces are separated into long and short range components. The decomposition scheme minimizes communication costs and allows tolerance for slow networks. The code approaches optimality in several dimensions. The force computatio...

Quadtrees* Erik G. Hoel Hanan Samet Computer Science Department Computer Science Department Center for Automation Research Center for Automation Research Institute for Advanced Computer Sciences Institute for Advanced Computer Sciences University of Maryland University of Maryland College Park, Maryland 20742 College Park, Maryland 20742 Abstract Data-parallel primitives for performing operatio...

By using the topological structure synthesis theory and method based on POC (Position and Orientation Characteristic) equations,a novel 4-DOF 3T1R parallel manipulator (PM) with low coupling degree, 2PaRSS, is presented.First,the modeling and numerical solutions for forward and inverse position of the PM is established. Then, the workspace and rotation capacity of the PM are analyzed based on i...

Air samples were collected by personal sampling with five stage Sioutas cascade impactors and respirable cyclones in parallel among tappers and crane operators in two manganese (Mn) alloy smelters in Norway to investigate PM fractions. The mass concentrations of PM collected by using the impactors and the respirable cyclones were critically evaluated by comparing the results of the parallel mea...