scholarly journals Low-cost, risk-reduction testing of class D spacecraft photovoltaic systems

2014 ◽  
Author(s):  
Joshua B Forgione ◽  
Gilbert Kojima ◽  
Robert Hanel ◽  
Mark Mallinson
Keyword(s):  
Risk Reduction ◽  
Low Cost ◽  
Photovoltaic Systems ◽  
Class D ◽  
Cost Risk

scholarly journals An On-Line Low-Cost Irradiance Monitoring Network with Sub-Second Sampling Adapted to Small-Scale PV Systems

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3405 ◽  
Author(s):  
Manuel Espinosa-Gavira ◽  
Agustín Agüera-Pérez ◽  
Juan González de la Rosa ◽  
José Palomares-Salas ◽  
José Sierra-Fernández
Keyword(s):  
Sensor Networks ◽  
Low Cost ◽  
Monitoring Network ◽  
Absolute Error ◽  
Small Scale ◽  
Photovoltaic Systems ◽  
Real Time Control ◽  
Short Term ◽  
Time Control ◽  
Cloud Motion

Very short-term solar forecasts are gaining interest for their application on real-time control of photovoltaic systems. These forecasts are intimately related to the cloud motion that produce variations of the irradiance field on scales of seconds and meters, thus particularly impacting in small photovoltaic systems. Very short-term forecast models must be supported by updated information of the local irradiance field, and solar sensor networks are positioning as the more direct way to obtain these data. The development of solar sensor networks adapted to small-scale systems as microgrids is subject to specific requirements: high updating frequency, high density of measurement points and low investment. This paper proposes a wireless sensor network able to provide snapshots of the irradiance field with an updating frequency of 2 Hz. The network comprised 16 motes regularly distributed over an area of 15 m × 15 m (4 motes × 4 motes, minimum intersensor distance of 5 m). The irradiance values were estimated from illuminance measurements acquired by lux-meters in the network motes. The estimated irradiances were validated with measurements of a secondary standard pyranometer obtaining a mean absolute error of 24.4 W/m 2 and a standard deviation of 36.1 W/m 2 . The network was able to capture the cloud motion and the main features of the irradiance field even with the reduced dimensions of the monitoring area. These results and the low-cost of the measurement devices indicate that this concept of solar sensor networks would be appropriate not only for photovoltaic plants in the range of MW, but also for smaller systems such as the ones installed in microgrids.

scholarly journals Should preoperative showering or cleansing with chlorhexidine gluconate (CHG) be part of the surgical care bundle to prevent surgical site infection?

2017 ◽  
Vol 18 (6) ◽  
pp. 311-314 ◽  
Author(s):  
Charles E Edmiston ◽  
David Leaper
Keyword(s):  
Surgical Site Infection ◽  
Risk Reduction ◽  
Low Cost ◽  
Surgical Care ◽  
Infection Risk ◽  
Chlorhexidine Gluconate ◽  
Low Risk ◽  
Care Bundle ◽  
Site Infection ◽  
Methodological Issues

Showering preoperatively with chlorhexidine gluconate is an issue that continues to promote debate; however, many studies demonstrate evidence of surgical site infection risk reduction. Methodological issues have been present in many of the studies used to compile guidelines and there has been a lack of standardisation of processes for application of the active agents in papers pre-2009. This review and commentary paper highlights the potential for enhancing compliance with this low-risk and low-cost intervention and provides some guidance for enhancing implementation of preoperative showering with both chlorhexidine in solution and impregnated wipes.

scholarly journals Development of a modular compensator that achieves improvement in the amount of power generation of a solar cell system by equalizing electrical characteristics

Impact ◽  
2020 ◽  
Vol 2020 (4) ◽  
pp. 60-61
Author(s):  
Masatoshi Uno
Keyword(s):  
Renewable Energy ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Lithium Ion ◽  
Cell System ◽  
Associate Professor ◽  
Photovoltaic Systems ◽  
Solar Panels ◽  
Switching Power ◽  
Life Evaluation

Interest in photovoltaic systems, which are a renewable energy technology that transforms the energy from the Sun into electricity using photovoltaics, or solar panels, is on the rise. With non-renewable energy sources such as coal and fuel recognised as finite, the importance of improving renewable sources, such as solar energy, is more and more pressing. Unfortunately, there are still many challenges and drawbacks associated with photovoltaic systems, which is why research in this area is of the utmost importance. Dr Masatoshi Uno is an Associate Professor of Electrical Engineering in the Department of Electrical and Electronics Engineering at Ibaraki University, Japan. He has a multitude of research interests spanning switching power converters, cell equalisers, life evaluation for supercapacitors and lithium-ion batteries and the development of fuel cell systems. Dr Masatoshi Uno's work seeks to enable photovoltaic systems to deliver impressive power at low cost and complexity and overcome the challenges associated with traditional photovoltaic systems.

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