Condition Assessment and Analysis of Bearing of Doubly Fed Wind Turbines Using Machine Learning Technique

Condition monitoring of wind turbines is progressively increasing to maintain the continuity of clean energy supply to power grids. This issue is of great importance since it prevents wind turbines from failing and overheating, as most wind turbines with doubly fed induction generators (DFIG) are overheated due to faults in generator bearings. Bearing fault detection has become a main topic targeting the optimum operation, unscheduled downtime, and maintenance cost of turbine generators. Wind turbines are equipped with condition monitoring devices. However, effective and reliable fault detection still faces significant difficulties. As the majority of health monitoring techniques are primarily focused on a single operating condition, they are unable to effectively determine the health condition of turbines, which results in unwanted downtimes. New and reliable strategies for data analysis were incorporated into this research, given the large amount and variety of data. The development of a new model of the temperature of the DFIG bearing versus wind speed to identify false alarms is the key innovation of this work. This research aims to analyze the parameters for condition monitoring of DFIG bearings using SCADA data for k-means clustering training. The variables of k are obtained by the elbow method that revealed three classes of k (k = 0, 1, and 2). Box plot visualization is used to quantify data points. The average rotation speed and average temperature measurement of the DFIG bearings are found to be primary indicators to characterize normal or irregular operating conditions. In order to evaluate the performance of the clustering model, an analysis of the assessment indices is also executed. The ultimate goal of the study is to be able to use SCADA-recorded data to provide advance warning of failures or performance issues

Energizers Classroom-based Physical Activities 3-5 : The way teachers integrate physical activity with academic concepts

Energizers are classroom-based physical activities that were designed to help teachers integrate physical activity with academic concepts. The energizers were developed by a team from the Activity Promotion Laboratory at East Carolina University. Teachers can download these activities free of charge and are encouraged to incorporate these activities into their classroom. Our research, published in the journal Medicine and Science in Sports and Exercise (2006, volume 38, number 12), demonstrated that: (a) Energizers are easy to implement; (b) both teachers and students enjoy the Energizers activities; (c) use of Energizers activities improves on-task behavior of students; and (d) use of Energizers increases the amount of physical activity accumulated over the course of the school day.Activity Promotion Laboratory: Projects Fulfilling a Nee

Social Studies Middle-School Energizers Classroom-based Physical Activities The way teachers integrate physical activity with academic concepts

Activity Promotion Laboratory: Projects Fulfilling a NeedMiddle School Energizers Middle School Energizers are classroom-based physical activities that integrate physical activity with academic concepts. The Middle School Energizers were developed by a team from the Activity Promotion Laboratory at East Carolina University. We hope these 10-minute activities make it easier for teachers to implement physical activity into the classroom to improve classroom instruction and increase physical activity levels over the school day. Teachers can download these activities free of charge and are encouraged to incorporate these activities into their classroom.Activity Promotion Laboratory: Projects Fulfilling a Nee

Music Middle-School Energizers Classroom-based Physical Activities The way teachers integrate physical activity with academic concepts

Middle School Energizers are classroom-based physical activities that integrate physical activity with academic concepts. The Middle School Energizers were developed by a team from the Activity Promotion Laboratory at East Carolina University. We hope these 10-minute activities make it easier for teachers to implement physical activity into the classroom to improve classroom instruction and increase physical activity levels over the school day. Teachers can download these activities free of charge and are encouraged to incorporate these activities into their classroomActivity Promotion Laboratory: Projects Fulfilling a Nee

Healthful Living Middle-School Energizers Classroom-based Physical Activities The way teachers integrate physical activity with academic concepts

Middle School Energizers Middle School Energizers are classroom-based physical activities that integrate physical activity with academic concepts. The Middle School Energizers were developed by a team from the Activity Promotion Laboratory at East Carolina University. We hope these 10-minute activities make it easier for teachers to implement physical activity into the classroom to improve classroom instruction and increase physical activity levels over the school day. Teachers can download these activities free of charge and are encouraged to incorporate these activities into their classroom.Activity Promotion Laboratory: Projects Fulfilling a Nee

The Body Dances: Carnival Dance and Organization

Building on the work of Pierre Bourdieu and Maurice Merleau-Ponty we seek to open up traditional categories of thought surrounding the relation `body-organization' and elicit a thought experiment: What happens if we move the body from the periphery to the centre? We pass the interlocking theoretical concepts of object-body/subject-body and habitus through the theoretically constructed empirical case of `carnival dance' in order to re-evaluate such key organizational concepts as knowledge and learning. In doing so, we connect with an emerging body of literature on `sensible knowledge'; knowledge that is produced and preserved within bodily practices. The investigation of habitual appropriation in carnival dance also allows us to make links between repetition and experimentation, and reflect on the mechanism through which the principles of social organization, whilst internalized and experienced as natural, are embodied so that humans are capable of spontaneously generating an infinite array of appropriate actions. This perspective on social and organizational life, where change and permanence are intricately interwoven, contrasts sharply with the dominant view in organization studies which juxtaposes change/ creativity and stability

Validity of the new lifestyles NL-1000 accelerometer for measuring time spent in moderate-to-vigorous physical activity in school settings

Current interest in promoting physical activity in the school environment necessitates an inexpensive, accurate method of measuring physical activity in such settings. Additionally, it is recognized that physical activity must be of at least moderate intensity in order to yield substantial health benefits. The purpose of the study, therefore, was to determine the validity of the New Lifestyles NL-1000 (New Lifestyles, Inc., Lee's Summit, Missouri, USA) accelerometer for measuring moderate-to-vigorous physical activity in school settings, using the Actigraph GT1M (ActiGraph, Pensacola, Florida, USA) as the criterion. Data were collected during a cross-country run (n = 12), physical education (n = 18), and classroom-based physical activities (n = 42). Significant and meaningful intraclass correlations between methods were found, and NL-1000 estimates of moderate-to-vigorous physical activity were not meaningfully different from GT1M-estimated moderate- to-vigorous physical activity. The NL-1000 therefore shows promising validity evidence as an inexpensive, convenient method of measuring moderate-to-vigorous physical activity in school settings

Super Typhoon Bopha and the Mayo River Debris-Flow Disaster, Mindanao, Philippines, December 2012

Category 5 (C5) Super Typhoon Bopha, the world’s worst storm of 2012, formed abnormally close to the West Pacific Equator, and Bopha’s Mindanao landfall has the record equatorial proximity for C5 storms. Bopha generated a debris flow that buried 500 ha of New Bataan municipality and killed 566 people. New Bataan, established in 1968, had never experienced super typhoons and debris flows. We describe the respective histories of New Bataan and Super Typhoon Bopha; debris flows; and how population growth and unwise settlement practices contribute to Philippine “natural” disasters. The historical record of Mindanao tropical cyclones yields clues regarding how climate change may be exacerbating near-equatorial vulnerability to typhoons. Existing models of future typhoon behavior do not apply well to Mindanao because they evaluate only the tropical cyclones that occur during the main June–October typhoon season, and most Mindanao tropical cyclones occur in the off season. The models also ignore tropical depressions, the most frequent—and commonly lethal—Mindanao cyclones. Including these in annual tallies of Mindanao cyclones up to early 2018 reveals a pronounced and accelerating increase since 1990. Mindanao is susceptible to other natural hazards, including other consequences of climate change and volcanic activity

Energizers : Classroom-based Physical Activities K-2

Energizers Energizers are classroom-based physical activities that were designed to help teachers integrate physical activity with academic concepts. The energizers were developed by a team from the Activity Promotion Laboratory at East Carolina University. Teachers can download these activities free of charge and are encouraged to incorporate these activities into their classroom. Our research, published in the journal Medicine and Science in Sports and Exercise (2006, volume 38, number 12), demonstrated that: (a) Energizers are easy to implement; (b) both teachers and students enjoy the Energizers activities; (c) use of Energizers activities improves on-task behavior of students; and (d) use of Energizers increases the amount of physical activity accumulated over the course of the school day.Activity Promotion Laboratory: Project

The Incremental Cooperative Design of Preventive Healthcare Networks

This document is the Accepted Manuscript version of the following article: Soheil Davari, 'The incremental cooperative design of preventive healthcare networks', Annals of Operations Research, first published online 27 June 2017. Under embargo. Embargo end date: 27 June 2018. The final publication is available at Springer via http://dx.doi.org/10.1007/s10479-017-2569-1.In the Preventive Healthcare Network Design Problem (PHNDP), one seeks to locate facilities in a way that the uptake of services is maximised given certain constraints such as congestion considerations. We introduce the incremental and cooperative version of the problem, IC-PHNDP for short, in which facilities are added incrementally to the network (one at a time), contributing to the service levels. We first develop a general non-linear model of this problem and then present a method to make it linear. As the problem is of a combinatorial nature, an efficient Variable Neighbourhood Search (VNS) algorithm is proposed to solve it. In order to gain insight into the problem, the computational studies were performed with randomly generated instances of different settings. Results clearly show that VNS performs well in solving IC-PHNDP with errors not more than 1.54%.Peer reviewe