The optical response of heterogeneous plasmonic trimer structures composed of a silver nanoparticle dimer and a central gold nanoparticle is investigated analytically and numerically. The plasmon resonance of the silver dimer is controlled through near-field coupling, resulting in plasmon resonance frequency matching of the silver dimer and gold monomer. This coupling condition makes it possibl...

This article reports a new approach to track (x, y, z, t) coordinates of multiple fluorescent particles (diameter range 1–10 lm) simultaneously using a quantitative defocusing method. We find that the defocused image of a 1-lm diameter fluorescent particle formed by the objective lens of a conventional microscope has a bright outer ring due to the spherical aberration of the lens system. The ri...

In a hydrothermal preparation of crystalline magnetite (Fe3O4) nanoparticles, the influence of the experimental parameters (initial molar ratio of ferrous/ferric ions, initial concentration of ferrous ions, and heating time), and their interactions, on the particle formation was studied using response surface methodology (RSM), based on a statistical design of experiments (DOE). As indices indi...

A mathematical model to calculate the volume specific three-phase boundary length in the porous composite electrodes of solid-oxide fuel cell s presented. The model is exclusively based on geometrical considerations accounting for porosity, particle diameter, particle size distribution, nd solids phase distribution. Results are presented for uniform particle size distribution as well as for non...

In the present study, a theoretical model was used to examine factors affecting the filtration characteristics of filters used for respiratory protection. This work was designed to support the particulate filter test requirements established in 1996. The major operating parameters examined in this work include face velocity, fiber diameter, packing density, filter thickness, and fiber charge de...

Cyclones are devices used in various industries to remove particulate matter from gases and liquids. Commonly the power generation, cement, mining industries, cyclones improve efficiency longevity of equipment by removing dust other small particles that can cause wear damage. Among centrifugal separation, reverse-flow primarily for particle which reach heights several meters on an industrial sc...