An ultrasonic particle concentrator based on a standing-wave hemispherical resonator is combined with confocal laser-scanning fluorescence detection. The goal is to perform ultrasensitive biomedical analysis by concentration of biologically active microspheres. The standing-wave resonator consists of a 4 MHz focusing ultrasonic transducer combined with the optically transparent plastic bottom o...

Numerous research studies have been done to improve the gold recovery methods and to fi nd alternative processing techniques in the last decade. The main goal in this search has become to design an effi cient plant employing environmentally acceptable processes today. For this purpose, the application of environmentally friendly, no chemical included techniques like centrifugal gravity separato...

9 ABSTRACT | The development of a thermochemical energy 10 storage system based on ammonia, for use with concentrating 11 solar power is discussed in this paper. This is one of a group of 12 storage options for concentrating solar power, some of which 13 are already operating commercially using molten salts. The 14 ammonia storage development has involved prototype solar 15 receiver/reactors op...

In this paper, a multi-layer and multi-dish model was proposed for a multi-dish concentrator system. Based on the model, the flux distribution of focal plane was calculated by Monte Carlo ray tracing method (MCRTM). The results show that the multi-dish concentrator system is composed of three different focal length parabolic surfaces. The design parameters calculated from the model have a good ...

A sparse crossbar (n,m)-concentrator is a bipartite graph with n source and m sink vertices, m ≤ n, in which there exists a matching between every m source vertices and the m sink vertices. In this paper, we investigate the structure, and the density of sparse crossbar (n,m)-concentrators among all 2 bipartite graphs. We establish that the density of sparse crossbar concentrators is bounded fro...

Acurex Corporation, under contract to the Jet Propulsion Laboratory, is developing a second generation point focusing solar concentrator. The design is based on reflective gores fabricated of thin glass mirror bonded continuously to a contoured substrate of cellular glass. To date the preliminary design effort is complete and is reviewed in this presentation. The concentrator aperture and struc...

Concentrating solar applications utilize direct normal irradiance (DNI) radiation, a measurement rarely available. The solar concentrator industry has begun to deploy numerous measurement stations to prospect for suitable system deployment sites. Rotating shadowband radiometers (RSR) using silicon photodiodes as detectors are typically deployed. This paper compares direct beam estimates from RS...

The paper describes a novel method of drilling into hard non-conductive materials by localized microwave energy (US patent 6,114,676). The Microwave Drill implementation may utilize a conventional 2.45GHz magnetron, to form a portable and relatively simple drilling tool. The drilling head consists of a coaxial guide and a near-field concentrator. The latter focuses the microwave radiation into ...

Recent changes in environmental regulatory paradigms, such as EPA’s performance-based measurement systems (PBMS), are lowering method compliance barriers for laboratories working under the Resource Conservation and Recovery Act (RCRA). One of the stated goals of PBMS is to educate the regulators and the regulated community on the inherent and intended flexibility of SW-846 methods. Operating un...

This paper investigated the effect of mineral surface oxidation on floatability Kevitsa low-grade Ni-Cu ore. Physicochemical measurements, ethylene diamine tetra acetic acid (EDTA) extraction, and oxygen uptake experiments were carried out with slurry recycled process water samples obtained from Cu-Ni sequential concentrator plant. The pH water, copper flotation feed, nickel feed dropped by 0.7...