Embedding Four-directional Paths on Convex Point Sets

A directed path whose edges are assigned labels "up", "down", "right", or "left" is called \emph{four-directional}, and \emph{three-directional} if at most three out of the four labels are used. A \emph{direction-consistent embedding} of an \mbox{$n$-vertex} four-directional path $P$ on a set $S$ of $n$ points in the plane is a straight-line drawing of $P$ where each vertex of $P$ is mapped to a distinct point of $S$ and every edge points to the direction specified by its label. We study planar direction-consistent embeddings of three- and four-directional paths and provide a complete picture of the problem for convex point sets.Comment: 11 pages, full conference version including all proof

Improving Short-Circuit Current of Concentrator Solar Cells Using a Deposited Microbead Layer

International audienc

CPV Module to Rate Antireflective and Encapsulant Coating in Outdoor Conditions

International audienceReflections are the most important channel losses in CPV modules. Since high efficiency solar cells need a protection against moisture and oxidation, we study an antireflective coating which also encapsulates the solar cells. It is based on a monolayer of microbeads partially submerged into PDMS. In this work, a CPV module is designed to compare the electrical performance of encapsulated and bare solar cells. A preliminary study demonstrates an increase in short-circuit current by 3.8% with EQE measurements and simulations. Outdoor measurements in Sherbrooke, Quebec, Canada gave a 6.4% increase in current for a 280X module on a clear cold day in September, after rejecting aberrant measurements, which confirms the interest of using microbeads as an antireflective coating for CPV applications

CPV Module to Rate Antireflective and Encapsulant Coating in Outdoor Conditions

International audienceReflections are the most important channel losses in CPV modules. Since high efficiency solar cells need a protection against moisture and oxidation, we study an antireflective coating which also encapsulates the solar cells. It is based on a monolayer of microbeads partially submerged into PDMS. In this work, a CPV module is designed to compare the electrical performance of encapsulated and bare solar cells. A preliminary study demonstrates an increase in short-circuit current by 3.8% with EQE measurements and simulations. Outdoor measurements in Sherbrooke, Quebec, Canada gave a 6.4% increase in current for a 280X module on a clear cold day in September, after rejecting aberrant measurements, which confirms the interest of using microbeads as an antireflective coating for CPV applications