by Ganisetti Vijay Kumar  , Min-Ze Lu  and Chang-Ming Liaw

Received: 02 May 2021;  Published: 11 August 2021;  doi: 10.21926/jept.2103037

The development of high-efficiency motor drives for various applications is important in the industry 4.0 era, especially for their extensive application to electric vehicles (EVs). In this study, a position sensorless EV synchronous reluctance motor (SynRM) drive has been developed, which exhibits good driving performance and efficiency over a wide speed and load range. To solve the key problems popularly encountered in the existing approaches, the high-frequency injection (HFI) scheme based on q-axis injection ha [...]

by Paolo Bellavite  , Fabio Arruda-Silva  and Marta Marzotto

Received: 20 April 2021;  Published: 11 August 2021;  doi: 10.21926/obm.icm.2103023

Homeopathy is often attacked with claims of not being evidence-based or for the implausible nature of its major principles of dilution/potentization and/or the similars (“similia similibus curentur”). However, these statements have already been falsified on the experimental ground, besides being incorrect on an epistemological level. Here we provide an updated appraisal of the scientific approach to the principle of Similars and homeopathy, focusing on laboratory models. After a brief historical introdu [...]

by Layachi Guelmine  and Hadda Hadjab

Received: 27 March 2021;  Published: 09 August 2021;  doi: 10.21926/rpm.2103033

The present study investigated the effect of reused rubber particles (RRP) on the deicer salt durability of ordinary concrete. Four mixtures were designed, a control concrete (CC) and three other rubber concretes obtained by partial substitution of natural dune sand aggregate with reused rubber particles with 0%, 3%, 6%, and 9% w/w. All studied concretes were subjected to the combined effect of freeze/thaw (56 and 120) cycles with the deicer salt solution of 3% NaCl. The results indicated that RRP improved the deic [...]

by Ali Aldubaisi  and Jorge Valenzuela

Received: 26 April 2021;  Published: 04 August 2021;  doi: 10.21926/jept.2103036

Aging models are important input into wind farm maintenance and financial viability models. Aging of wind turbines depends on many factors, including both ambient and usage conditions. This paper presents a virtual age based maintenance model for wind turbines considering the effect of wind speed and ambient air temperature on turbine aging. Two maintenance thresholds (i.e., corrective threshold and preventive threshold) and three repair actions (i.e., unscheduled corrective, scheduled corrective and preventive act [...]

by Ganga R. Neupane  , Amrit Kaphle  , David N. Mcllroy  , Elena Echeverria  , Prasanna Sankaran  and Parameswar Hari

Received: 12 May 2021;  Published: 04 August 2021;  doi: 10.21926/jept.2103035

Iron doped ZnO (Fe-ZnO) nanoparticles were synthesized using two techniques that are economical as well as scalable to yield tunable properties of nanoparticles for facilitating down conversion in an absorbing layer of a solar cell. To evaluate the suitability of Fe-ZnO nanoparticles prepared by two deposition methods, we present a comparison of optical, electrical, and structural properties of Fe-ZnO using several experimental techniques. Structural properties were analyzed using transmission electron microscopy a [...]

by Giuseppe Cocco  and Philipp Amiet

Received: 23 March 2021;  Published: 30 July 2021;  doi: 10.21926/obm.genet.2103133

“Epigenetics is the study of how your behaviors and environment can cause changes that affect the way your genes work. Unlike genetic changes, epigenetic changes are reversible and do not change your DNA sequence, but they can change how your body reads a DNA sequence” (https://www.cdc.gov/genomics/disease/epigenetics.htm). Epigenetic interactions, along with the genetic expression in innate cells, change the structure and function of chromatin, and thus, turn the genes on and off. Epigenetic changes influence dise [...]

by Heath Murray  and Mehdi Khaki

Received: 23 October 2020;  Published: 29 July 2021;  doi: 10.21926/aeer.2103019

Inland water bodies are crucial for supporting human life in various parts of the world. Therefore, it is essential to accurately monitor its spatiotemporal variations for better water management. The main objective of this study is to investigate the application of remote sensing data for quantifying the surface area changes and the impact of climatological variabilities over Lakes Mead and Chapala. Historical time series of monthly surface area dynamics were developed using Landsat 1-8 scenes and the climate vari [...]

by Giuseppe Cocco  and Philipp R. Amiet

Received: 16 January 2021;  Published: 28 July 2021;  doi: 10.21926/obm.geriatr.2103178

Atrial fibrillation is very common in most old patients who need an adapted therapy due to their comorbidities. Before initiating an antiarrhythmic therapy, possible adverse effects, especially iatrogenic proarrhythmia, and extracardiac side-effects, must be considered. In geriatric patients with atrial fibrillation, heart rate control is the most frequent therapy. Oral anticoagulation plays a vital role in the therapy, but anticoagulation in old patients, who had a bleeding or stroke event, is challenging. Availab [...]

by Morisaki Naoko

Received: 23 October 2020;  Published: 28 July 2021;  doi: 10.21926/obm.geriatr.2103177

Objective: The present study aimed to elucidate the relationship between oral exercise and oral function among older adults requiring care in the nursing facilities of Japan. Methodology: The subjects were adults aged 65 years or above, requiring care and admitted to the nursing facilities for older adults in Japan. The subjects performed the assigned oral exercises, which included the exercises focused on the neck, shoulder, upper limbs, tongue, lips, cheek movement, vocalization, and deep breathing, in groups und [...]

by Mônica Batista Leite  and Paulo Roberto Lopes Lima

Received: 07 March 2021;  Published: 28 July 2021;  doi: 10.21926/rpm.2103032

The production of concrete using recycled aggregates, obtained from the processing of construction and demolition waste, is extensively practiced worldwide. However, the effect of simultaneous adding fine recycled aggregate and the recycled coarse aggregate on the mechanical properties of concrete is still unfamiliar. This work aims to evaluate the influence of the water/cement ratio (WC Ratio), the fine recycled aggregate content (%FRA), the coarse recycled aggregate content (%CRA), as well as the interaction betw [...]