INTRODUCTION There has been considerable interest in the determination of anions at trace levels by IC. For example, the Electric Power Research Institute (EPRI) has established IC as the analytical technique for determining sodium, chloride, and sulfate down to 0.25 μg/L (ppb) in power plant waters. For high-purity water used in semiconductor processing, the Semiconductor Equipment and Materia...

The electrolytic coproduction of CO and H2 is achieved from air, water, and a single beam of sunlight rather than from fossil fuels. H2 and CO cosynthesis is driven by a single concentrator photovoltaic to simultaneously drive molten hydroxide and molten carbonate electrolyses. The carbon neutral process captures carbon without the need for the preconcentration of atmospheric carbon dioxide.

We report for the first time a successful fabrication and operation of an InAs/GaAs quantum dot based intermediate band solar cell concentrator photovoltaic (QD-IBSC-CPV) module to the IEC62108 standard with recorded power conversion efficiency of 15.3%. Combining the measured experimental results at Underwriters Laboratory (UL®) licensed testing laboratory with theoretical simulations, we conf...

The theoretical bases for casting maximum energy on a cell placed in a static concentrator of minimum entry aperture are derived. Several concentrators are analysed according to this theory and the gain achievable with each is obtained. When practical materials are used the maximum gain is about 9 for the direct beam source and about 4.5 for diffuse radiation. One of the concentrators analysed ...

SETTING A 42-bed hospital operated by the Medical Research Council (MRC) Unit in The Gambia. OBJECTIVE To devise, test and evaluate a cost-efficient uninterrupted oxygen system in the MRC Hospital. DESIGN Oxygen cylinders were replaced with oxygen concentrators as the primary source of oxygen. An uninterruptable power supply (UPS) ensured continuity of power. Hospital staff were trained on ...

Cu(In,Ga)Se2 solar cells have reached a record efficiency of 23.35% and are established as renewable energy technology. However, future large-scale fabrication might be hindered by the availability high cost raw materials. To reduce amount cell material, strong efforts been devoted to development micro-concentrator photovoltaics concept for thin-film cells, which combines well stablished concen...