scholarly journals Wind inflow observation from load harmonics: initial steps towards a field validation

2020 ◽  
Author(s):  
Marta Bertelè ◽  
Carlo L. Bottasso ◽  
Johannes Schreiber
Keyword(s):  
Independent Method ◽  
Experimental Setup ◽  
Reasonable Accuracy ◽  
Field Validation ◽  
Turbulent Fluctuations ◽  
Air Density ◽  
Time Histories ◽  
Rotor Disk ◽  
Practical Demonstration

Abstract. A previously published wind sensing method is applied to an experimental dataset obtained on a 3.5 MW turbine and a nearby hub-tall met-mast. The method uses blade load harmonics to estimate rotor-equivalent shears and wind directions at the rotor disk. A second independent method is used to extend the met-mast-measured shear above hub height to cover the entire rotor disk. Although the experimental setup falls short of providing a real validation of the method, it still allows for a realistic practical demonstration of some of its main features. The method appears to be robust to turbulent fluctuations and air density changes. Results indicate a good quality of the estimated shear, both in terms of 10-min averages and of resolved time histories, and a reasonable accuracy in the estimation of the yaw misalignment.

scholarly journals Wind inflow observation from load harmonics: initial steps towards a field validation

2021 ◽  
Vol 6 (3) ◽  
pp. 759-775
Author(s):  
Marta Bertelè ◽  
Carlo L. Bottasso ◽  
Johannes Schreiber
Keyword(s):  
Independent Method ◽  
Strain Gages ◽  
Field Validation ◽  
Wind Model ◽  
Experimental Dataset ◽  
Linear Shear ◽  
Time Histories ◽  
Rotor Disk ◽  
Practical Demonstration

Abstract. A previously published wind sensing method is applied to an experimental dataset obtained from a 3.5 MW turbine. The method is based on a load-wind model that correlates once-per-revolution blade load harmonics to rotor-equivalent shears and wind directions. Loads measured during turbine operation are used to estimate online – through the load-wind model – the inflow at the rotor disk, thereby turning the whole turbine into a sort of generalized anemometer. The experimental dataset consists of synchronous measurements of loads, from blade-mounted strain gages, and of the inflow, obtained from a nearby met mast. As the mast reaches only to hub height, a second independent method is used to extend the met-mast-measured shear above hub height to cover the entire rotor disk. Part of the dataset is first used to identify the load-wind model, and then the performance of the wind observer is characterized with the rest of the data. Although the experimental setup falls short of providing a thorough validation of the method, it still allows for a realistic practical demonstration of some of its main features. Results indicate a good quality of the estimated linear shear both in terms of 1 and 10 min averages and of resolved time histories, with mean average errors around 0.04. A similarly accuracy is found in the estimation of the yaw misalignment, with mean errors typically below 3∘.

scholarly journals Development of the TabacoQuest app for computerization of data collection on smoking in psychiatric nursing

2016 ◽  
Vol 24 (0) ◽  
Author(s):  
Renata Marques de Oliveira ◽  
Alexandre Freitas Duarte ◽  
Domingos Alves ◽  
Antonia Regina Ferreira Furegato
Keyword(s):  
Data Collection ◽  
Human Error ◽  
Technological Development ◽  
Psychiatric Patients ◽  
Mobile App ◽  
Psychiatric Nursing ◽  
Field Validation ◽  
Final Test ◽  
Computational Resources

ABSTRACT Objective: to develop a mobile app for research on the use of tobacco among psychiatric patients and the general population. Method: applied research with the technological development of an app for data collection on an Android tablet. For its development, we considered three criteria: data security, benefits for participants and optimization of the time of researchers. We performed tests with twenty fictitious participants and a final test with six pilots. Results: the app collects data, stores them in the database of the tablet and export then to an Excel spreadsheet. Resources: calculator, stopwatch, offline operation, branching logic, field validation and automatic tabulation. Conclusion: the app prevents human error, increases the quality of the data by validating them during the interview, allows the performing of automatic tabulation and makes the interviews less tiring. Its success may encourage the use of this and other computational resources by nurses as a research tool.

scholarly journals Assessing the Quality of Roof-Harvested Rainwater after Bushfires

2019 ◽  
Vol 34 (s1) ◽  
pp. s42-s42
Author(s):  
Malinda Steenkamp ◽  
Kirstin Ross ◽  
Harriet Whiley ◽  
Emmanuel Chubaka ◽  
Paul Arbon
Keyword(s):  
Field Study ◽  
South Australia ◽  
Fire Season ◽  
Contaminated Water ◽  
Field Validation ◽  
Fire Event ◽  
Drinking And Irrigation ◽  
Two Samples ◽  
Copper Arsenate

Introduction:Roof-harvested rainwater held in domestic tanks is used for a variety of purposes in Australia, including drinking and irrigation. There is limited evidence about the quality of rainwater after bushfires. Current health guidelines can be interpreted that landholders need to drain their rainwater tanks to avoid the risk of contamination. Anecdotal reports indicate that following such advice caused additional distress to landowners affected by bushfires in South Australia. Sustainable water management is important for future resilience and more evidence on water quality following bushfires is needed.Aim:This project investigated whether there is contamination of roof-harvested rainwater after bushfires, and if so, whether such water was safe for various purposes.Methods:In 2017 we tested artificially contaminated water spiked with chemicals associated with bushfires (chromated copper arsenate-treated ash and firefighting foam) and conducted a pilot field study using two purposely built roofs during a pre-fire season burn off. A field validation is planned for the summer of 2018/19 (December 2018 - March 2019), i.e., we plan to obtain 200 samples from 50 households affected by bushfire – two samples immediately after the fire event and another two after the first rain.Results:The artificially created contaminated water fell within guidelines for non-potable uses such as irrigation and stock watering, but was found unsuitable for drinking even after being filtered through two commercially available water filtration systems. We also plan to present results from our field study of 50 households.Discussion:Contaminant concentrations, even in artificially spiked water samples, are low and acceptable for non-potable uses. Bottled water should be used for drinking. Landholders should be encouraged to use their water for recovery purposes. Such advice may assist with decreasing the stress experienced by affected landholders and help with recovery efforts through the availability of a greater body of water.

Delivering Pharmaceutical Services from a Decentralized Pharmacy — Health Care System in Spain

1982 ◽  
Vol 16 (2) ◽  
pp. 141-143
Author(s):  
Joaquin Bonal ◽  
Joan Altimiras
Keyword(s):  
Health Care ◽  
Information Quality ◽  
Drug Information ◽  
Pharmaceutical Services ◽  
Teaching Activities ◽  
Control Programs ◽  
Research And Teaching ◽  
Practical Demonstration ◽  
Pharmacy System

This article presents a practical demonstration of a decentralized pharmacy system improving the quality of pharmaceutical services. The authors explain the working system of a satellite pharmacy in one of the pavilions of the Hospital de la Santa Creu i Sant Pau in Barcelona, Spain. Clinical pharmacists working in this satellite become deeply involved in drug information, quality control programs, pharmacokinetics, patient education, research, and teaching activities.

scholarly journals Experimental setup proposed to measure the quality of a spherical surface using deflectometry and a Hartmann screen

2015 ◽  
Vol 605 ◽  
pp. 012004 ◽  
Author(s):  
A Muñoz-Potosi ◽  
R Díaz-Uribe ◽  
M Campos-García ◽  
F Granados-Agustín
Keyword(s):  
Spherical Surface ◽  
Experimental Setup

scholarly journals Comparison of PM2.5 in Seoul, Korea Estimated from the Various Ground-Based and Satellite AOD

2021 ◽  
Vol 11 (22) ◽  
pp. 10755
Author(s):  
Sang-Min Kim ◽  
Ja-Ho Koo ◽  
Hana Lee ◽  
Jungbin Mok ◽  
Myungje Choi ◽  
...  
Keyword(s):  
Satellite Remote Sensing ◽  
Correlation Coefficients ◽  
Reasonable Accuracy ◽  
High Quality ◽  
Polar Orbit ◽  
Winter Condition ◽  
The Difference ◽  
Mlr Model

Based on multiple linear regression (MLR) models, we estimated the PM2.5 at Seoul using a number of aerosol optical depth (AOD) values obtained from ground-based and satellite remote sensing observations. To construct the MLR model, we consider various parameters related to the ambient meteorology and air quality. In general, all AOD values resulted in the high quality of PM2.5 estimation through the MLR method: mostly correlation coefficients >~0.8. Among various polar-orbit satellite AODs, AOD values from the MODIS measurement contribute to better PM2.5 estimation. We also found that the quality of estimated PM2.5 shows some seasonal variation; the estimated PM2.5 values consistently have the highest correlation with in situ PM2.5 in autumn, but are not well established in winter, probably due to the difficulty of AOD retrieval in the winter condition. MLR modeling using spectral AOD values from the ground-based measurements revealed that the accuracy of PM2.5 estimation does not depend on the selected wavelength. Although all AOD values used in this study resulted in a reasonable accuracy range of PM2.5 estimation, our analyses of the difference in estimated PM2.5 reveal the importance of utilizing the proper AOD for the best quality of PM2.5 estimation.

scholarly journals Development and characterisation of a self-powered measurement buoy prototype by means of piezoelectric energy harvester for monitoring activities in a marine environment

ACTA IMEKO ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 201
Author(s):  
Damiano Alizzio ◽  
Antonino Quattrocchi ◽  
Roberto Montanini
Keyword(s):  
Resonant Frequency ◽  
Environmental Monitoring ◽  
Power Supply ◽  
Smart City ◽  
Energy Harvester ◽  
Experimental Setup ◽  
Piezoelectric Energy ◽  
Maintenance Service ◽  
Self Powered

<p class="Abstract">In the interest of our society, for example in Smart City but also in other specific backgrounds, environmental monitoring is an essential activity to measure the quality of different ecosystems. In fact, the need to obtain accurate and extended measurements in space and time has considerably become relevant. In very large environments, such as marine ones, technological solutions are required for the use of smart, automatic, and self-powered devices in order to reduce human maintenance service. This work presents a simple and innovative layout for a small self-powered floating buoy, with the aim of measuring and transmitting the detected data for visualization, storage and/or elaboration. The power supply was obtained using a cantilever harvester, based on piezoelectric patches, converting the motion of ripple waves. Such type of waves is characterized by frequencies between 1.50 Hz and 2.50 Hz with oscillation between 5.0 ° and 7.0 °. Specifically, a dedicated experimental setup was created to simulate the motion of ripple waves and to evaluate the suitability of the proposed design and the performance of the used harvester. Furthermore, a dynamic analytical model for the harvester has been defined and the uncertainty correlated to the harvested power has been evaluated. Finally, the harvested voltage and power have shown how the presented buoy behaves like a frequency transformer. Hence, although the used cantilever harvester does not work in its resonant frequency, the harvested electricity undergoes a significant increase.</p><p class="Abstract"><span lang="EN-US"><br /></span></p>

scholarly journals Analysis Of Provided Service Quality In Flowers And Living Plants Transport

2015 ◽  
Vol 23 (36) ◽  
pp. 159-166
Author(s):  
Adela Poliaková
Keyword(s):  
Service Quality ◽  
Quality Of Services ◽  
Transport Mode ◽  
Specific Transport ◽  
Transport Modes ◽  
Practical Demonstration

Abstract This paper analyses quality of the living flowers and plants transportation. A part of this paper compares the demands for a particular transport mode and a practical demonstration of these transport modes within a specific transport mode. The paper presents a survey of quality of services provided by individual transport modes.

scholarly journals ADM1 approach to the performance optimisation and biogas H2S prediction of a large-scale anaerobic reactor fed on sugarcane vinasse

2019 ◽  
Vol 80 (9) ◽  
pp. 1774-1786
Author(s):  
Jorge Vinicius da Silva Neto ◽  
Marcelo Leite Conde Elaiuy ◽  
Edson Aparecido Abdul Nour
Keyword(s):  
Retention Time ◽  
Large Scale ◽  
Settling Tank ◽  
Extended Model ◽  
Retention Efficiency ◽  
Anaerobic Reactor ◽  
Solids Retention ◽  
Sugarcane Vinasse ◽  
Practical Demonstration

Abstract In this paper, we present extensions to the Anaerobic Digestion Model No. 1 (ADM1) to simulate hydrogen sulphide in biogas and solids retention efficiency. The extended model was calibrated and validated against data from a large-scale covered in-ground anaerobic reactor (CIGAR), processing sugarcane vinasse. Comparative scenarios and set-ups of a CIGAR with and without a settling tank unit (settler) were simulated to investigate the reactor's performance. Biogas flow, methane content, and yield with settler were 15,983 Nm3/d, 57%, and 0.198 Nm3CH4/kgCOD, respectively, which were 9.4%, 1.8%, and 11.64%, higher than without the settler. Improvements are combination of influent flow rate 116% higher and increased solids retention time by using a settler. The optimised modelled reactor, the volume of which was reduced by 50%, was able to produce 83% more methane per volume of reactor with half the retention time. After model calibration and validation, we assessed the quality of predictions and its utility. The overall quality of predictions was assessed as high accuracy quantitative for CH4 and medium for H2S and biogas flow. A practical demonstration of ADM1 to industrial application is presented here to identify the potential optimisation and behaviour of a large-scale anaerobic reactor, reducing, consequently, expenditure, risk, and time.

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