Abstract Laser-induced fluorescence measurements of singly-charged xenon ion velocities in Hall thrusters typically target metastable states due to lack available laser technology for exciting the ground state. The measured velocity distribution these ions are assumed reflect state behavior. However, this assumption has not been experimentally verified. To investigate accuracy assumption, a rec...

In this paper, a specialized Genetic Algorithm is proposed and applied for the solution of the Generalized Assignment Problem. Special crossover and the mutation operators called Common Element Crossover (CEX) and In-Pool Mutation (IPM) respectively has been defined by focusing on the special needs and nature of the Generalized Assignment Problem. The performance of the proposed method has been...

In this paper a new parallel genetic algorithm for coloring graph vertices is presented. In the algorithm we apply a migration model of parallelism and de ne two new recombination operators: SPPX and CEX. For comparison two recently proposed crossover operators: UISX and GPX are selected. The performance of the algorithm is veri ed by computer experiments on a set of standard graph coloring ins...

Introduction Nuvia S is a high-capacity strong cation exchanger (CEX) designed for optimal bioprocessing performance. It is built on the macroporous rigid UNOsphereTM base matrix, through the incorporation of polymeric surface extenders with optimized density of sulfonate groups. Such an approach gives Nuvia S excellent dynamic binding characteristics for target biomacromolecules and low backpr...

background: one of the most important activities in educational processes is evaluation of students. for evaluating the students’ professional performance, selecting an appropriate evaluation system is important. the aim of this study was to assess the clinical performance of medical interns and its affecting factors by mini-cex test. methods: this study was semi-experimental and mini-cex test ...