نتایج جستجو برای: concentrator
تعداد نتایج: 1692 فیلتر نتایج به سال:
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 work proposes a hybrid compound parabolic concentrator and trough (CPC/PTC) system for photovoltaic/thermal (CPV/T) photovoltaic/thermal-thermoelectric generator (CPVT-TEG) applications. The geometrical design optical analysis of the novel CPC/PTC are discussed in present study. Ray-tracing models were used to identify different variables that influence efficiency both CPC PTC. concentrati...
Emerging classes of concentrator photovoltaic (CPV) modules reach efficiencies that are far greater than those of even the highest performance flat-plate PV technologies, with architectures that have the potential to provide the lowest cost of energy in locations with high direct normal irradiance (DNI). A disadvantage is their inability to effectively use diffuse sunlight, thereby constraining...
BACKGROUND Portable oxygen devices simplify and facilitate patient therapy. This study was designed to compare S(pO2) and patient satisfaction with a portable oxygen concentrator or a combined system consisting of a fixed device with continuous-flow oxygen dispensation and a portable device with pulse dispensation for ambulation. METHODS This crossover trial assessed 25 subjects with COPD (92...
One year's experience with a new type of oxygen concentrator and anaesthetic machine, designed for anaesthesia in developing countries, is presented. The apparatus, its performance and problems are described and the author's suggested modifications to improve the original design are outlined. The apparatus, with these changes, represents a significant advance in oxygen availability for hospital...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید