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https://www.readbyqxmd.com/read/27919415/implementation-of-a-mfac-based-position-sensorless-drive-for-high-speed-bldc-motors-with-nonideal-back-emf
#1
Haitao Li, Xin Ning, Wenzhuo Li
In order to improve the reliability and reduce power consumption of the high speed BLDC motor system, this paper presents a model free adaptive control (MFAC) based position sensorless drive with only a dc-link current sensor. The initial commutation points are obtained by detecting the phase of EMF zero-crossing point and then delaying 30 electrical degrees. According to the commutation error caused by the low pass filter (LPF) and other factors, the relationship between commutation error angle and dc-link current is analyzed, a corresponding MFAC based control method is proposed, and the commutation error can be corrected by the controller in real time...
December 2, 2016: ISA Transactions
https://www.readbyqxmd.com/read/27909603/analyzing-exposures-to-electromagnetic-fields-in-an-intensive-care-unit
#2
Necati Gökmen, Sabri Erdem, Kadir Atilla Toker, Elvan Öçmen, Başak Ilgım Gökmen, Ahmet Özkurt
OBJECTIVE: In this study, we conducted a numerical analysis of exposure to electromagnetic fields (EMFs) in a hospital's intensive care unit that is one of the most crucial one in terms of hazardous areas among all service units. This is a new study for measuring exposure to EMFs in an intensive care unit as well as other healthcare services in Turkey. METHODS: We measured the EMFs in the intensive care unit with a SRM-3006 (selective radiation metre), which was used for measurement of the absolute and the limit values of high frequency EMFs...
October 2016: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/27909155/extrapolation-techniques-evaluating-24-hours-of-average-electromagnetic-field-emitted-by-radio-base-station-installations-spectrum-analyzer-measurements-of-lte-and-umts-signals
#3
Stefano Mossetti, Daniela de Bartolo, Ivan Veronese, Marie Claire Cantone, Cristina Cosenza, Elisa Nava
International and national organizations have formulated guidelines establishing limits for occupational and residential electromagnetic field (EMF) exposure at high-frequency fields. Italian legislation fixed 20 V/m as a limit for public protection from exposure to EMFs in the frequency range 0.1 MHz-3 GHz and 6 V/m as a reference level. Recently, the law was changed and the reference level must now be evaluated as the 24-hour average value, instead of the previous highest 6 minutes in a day. The law refers to a technical guide (CEI 211-7/E published in 2013) for the extrapolation techniques that public authorities have to use when assessing exposure for compliance with limits...
December 1, 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27904843/cardiac-surgery-in-africa-a-thirty-five-year-experience-on-open-heart-surgery-in-cote-d-ivoire
#4
Koffi Herve Yangni-Angate, Christophe Meneas, Florent Diby, Manga Diomande, Anicet Adoubi, Yves Tanauh
BACKGROUND: Few centers for open heart surgery (OHS) are in Sub-Saharan Africa. Lack of OHS results is also noted. By reporting our African experience on OHS, the aim of this study was to fill the gap. METHODS: It is a retrospective study on 2,612 patients who were subject to an OHS between 1978 and 2013. Data were collected from demographical, clinical, investigative studies, surgical and outcomes parameters. RESULTS: There were 1,475 cases of rheumatic heart diseases (RHD), 126 endomyocardial fibrosis (EMF), 741 congenital heart diseases (CHDs) and 270 various affections...
October 2016: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/27901344/effect-of-electromagnetic-waves-from-mobile-phone-on-immune-status-of-male-rats-possible-protective-role-of-vitamin-d
#5
Ola Ahmed El-Gohary, Mona Abdel-Azeem Said
There are considerable public concerns about the relationship between mobile phone radiation and human health. The present study assesses the effect of electromagnetic field (EMF) emitted from a mobile phone on the immune system in rats and the possible protective role of vitamin D. Rats were randomly divided into six groups: Group I: control group; Group II: received vitamin D (1000 IU/kg/day) orally; Group III: exposed to EMF 1 h/day; Group IV: exposed to EMF 2 h/day; Group V: exposed to EMF 1 h/day and received vitamin D (1000 IU/kg/day); Group VI: exposed to EMF 2 h/day and received vitamin D (1000 IU/kg/day)...
September 5, 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/27900594/early-successional-ectomycorrhizal-fungi-effectively-support-extracellular-enzyme-activities-and-seedling-nitrogen-accumulation-in-mature-forests
#6
Bailey A Nicholson, Melanie D Jones
After stand-replacing disturbance, regenerating conifer seedlings become colonized by different ectomycorrhizal fungi (EMF) than the locally adapted EMF communities present on seedlings in mature forests. We studied whether EMF species that colonized subalpine fir (Abies lasiocarpa) seedlings in clearcuts differed from those that colonized seedlings in adjacent mature forests with respect to mycorrhizoplane extracellular enzyme activities (EEAs) and N status of the seedlings. We tested two alternate hypotheses: (1) that EEAs would differ between the two EMF communities, with higher activities associated with forest-origin communities, and (2) that acclimation to soil environment was considerable enough that EEAs would be determined primarily by the soil type in which the ectomycorrhizas were growing...
November 29, 2016: Mycorrhiza
https://www.readbyqxmd.com/read/27892794/effects-of-repeated-9-and-30-day-exposure-to-extremely-low-frequency-electromagnetic-fields-on-social-recognition-behavior-and-estrogen-receptors-expression-in-olfactory-bulb-of-wistar-female-rats
#7
C Bernal-Mondragón, V Arriaga-Avila, E Martínez-Abundis, B Barrera-Mera, O Mercado-Gómez, R Guevara-Guzmán
OBJECTIVE: We investigated the short- and long-term effects of extremely low-frequency electromagnetic fields (EMF) on social recognition behavior and expression of α- and β-estrogen receptors (ER). METHODS: Rats were exposed to 60-Hz electromagnetic fields for 9 or 30 days and tested for social recognition behavior. Immunohistochemistry and western blot assays were performed to evaluate α- and β-ER expression in the olfactory bulb of intact, ovariectomized (OVX), and ovariectomized+estradiol (E2) replacement (OVX+E2)...
November 28, 2016: Neurological Research
https://www.readbyqxmd.com/read/27886792/diagnosis-and-management-of-endomyocardial-fibrosis
#8
REVIEW
Andrea Beaton, Ana Olga Mocumbi
Endomyocardial fibrosis (EMF) remains an important cause of restrictive cardiomyopathy worldwide. Patients cluster in specific geographic locations and are almost universally living in extreme poverty. Specific etiology remains elusive and is likely multifactorial. Untreated EMF has a very poor prognosis. Medical management can mitigate symptoms for a time but has no curative benefit. Early surgical interventions may improve survival but are not readily available in most EMF-endemic regions. Increased awareness, advocacy, and research are needed to further understand this neglected tropical cardiomyopathy and to improve survival of those affected...
February 2017: Cardiology Clinics
https://www.readbyqxmd.com/read/27886102/an-investigation-on-the-effect-of-extremely-low-frequency-pulsed-electromagnetic-fields-on-human-electrocardiograms-ecgs
#9
Qiang Fang, Seedahmed S Mahmoud, Jiayong Yan, Hui Li
For this investigation, we studied the effects of extremely low frequency pulse electromagnetic fields (ELF-PEMF) on the human cardiac signal. Electrocardiograms (ECGs) of 22 healthy volunteers before and after a short duration of ELF-PEMF exposure were recorded. The experiment was conducted under single-blind conditions. The root mean square (RMS) value of the recorded data was considered as comparison criteria. We also measured and analysed four important ECG time intervals before and after ELF-PEMF exposure...
November 23, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27872692/protective-effects-of-vitamin-e-consumption-against-3mt-electromagnetic-field-effects-on-oxidative-parameters-in-substantia-nigra-in-rats
#10
Ahmad Ali Ghanbari, Kobra Shabani, Daryoush Mohammad Nejad
INTRODUCTION: Electromagnetic fields (EMFs) can influence the biological system by the formation of free radicals in cells. The EMFs are able to deteriorate defense system against free radicals that leads to oxidative stress (OS). Lipid peroxidation process (LPO) is an index of oxidative stress, and the Malandialdehyde (MDA) is the final product of LPO. Vitamin E is the most important antioxidant which inhibits the LPO process. The aim of this study was to evaluate the effects of 3MT EMF exposure on oxidative stress parameters in substantia nigra and the role of vitamin E in reducing oxidative stress and preventing of LPO process...
October 2016: Basic and Clinical Neuroscience
https://www.readbyqxmd.com/read/27871289/inhibition-of-stat3-and-mapk-dependent-pge2-synthesis-ameliorates-phagocytosis-of-fibrillar-%C3%AE-amyloid-peptide-1-42-via-ep2-receptor-in-emf-stimulated-n9-microglial-cells
#11
Gen-Lin He, Zhen Luo, Ting-Ting Shen, Ping Li, Ju Yang, Xue Luo, Chun-Hai Chen, Peng Gao, Xue-Sen Yang
BACKGROUND: Prostaglandin E2 (PGE2)-involved neuroinflammatory processes are prevalent in several neurological conditions and diseases. Amyloid burden is correlated with the activation of E-prostanoid (EP) 2 receptors by PGE2 in Alzheimer's disease. We previously demonstrated that electromagnetic field (EMF) exposure can induce pro-inflammatory responses and the depression of phagocytosis in microglial cells, but the signaling pathways involved in phagocytosis of fibrillar β-amyloid (fAβ) in microglial cells exposed to EMF are poorly understood...
November 21, 2016: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/27867529/coexistence-of-apical-hypertrophic-cardiomyopathy-and-endomyocardial-fibrosis-with-calcification-diagnosis-using-multimodality-imaging
#12
Lakshmi Muthukumar, M Fuad Jan, Joseph Whitnah, A Jamil Tajik
A 48-year-old man from West Africa was evaluated for dyspnea. Echocardiography showed an echolucent mass at the left ventricular apex surrounded by a dense ridge of tissue, suggesting endomyocardial fibrosis (EMF). Doppler echocardiography showed restrictive hemodynamics and intramyocardial coronary blood flow at the hypertrophied apex, suggesting apical hypertrophic cardiomyopathy (ApHCM) with calcified thrombus. Cardiac magnetic resonance imaging showed a thickened myocardium with apical cavity obliteration and endomyocardial calcification, and gadolinium contrast demonstrated marked bright subendocardial and diffuse patchy intramyocardial hyperenhancement in the hypertrophied apical wall segment, confirming coexistence of EMF and ApHCM...
December 2016: ESC Heart Failure
https://www.readbyqxmd.com/read/27865708/effects-of-exposure-to-2100mhz-gsm-like-radiofrequency-electromagnetic-field-on-auditory-system-of-rats
#13
Metin Çeliker, Abdulkadir Özgür, Levent Tümkaya, Suat Terzi, Mustafa Yılmaz, Yıldıray Kalkan, Ender Erdoğan
INTRODUCTION: The use of mobile phones has become widespread in recent years. Although beneficial from the communication viewpoint, the electromagnetic fields (EMF) generated by mobile phones may cause unwanted biological changes in the human body. OBJECTIVE: In this study, we aimed to evaluate the effects of 2100MHz Global System for Mobile communication (GSM-like) electromagnetic field (EMF), generated by an EMF generator, on the auditory system of rats by using electrophysiological, histopathologic and immunohistochemical methods...
November 5, 2016: Brazilian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/27857169/mobile-phone-signal-exposure-triggers-a-hormesis-like-effect-in-atm-and-atm-mouse-embryonic-fibroblasts
#14
Chuan Sun, Xiaoxia Wei, Yue Fei, Liling Su, Xinyuan Zhao, Guangdi Chen, Zhengping Xu
Radiofrequency electromagnetic fields (RF-EMFs) have been classified by the International Agency for Research on Cancer as possible carcinogens to humans; however, this conclusion is based on limited epidemiological findings and lacks solid support from experimental studies. In particular, there are no consistent data regarding the genotoxicity of RF-EMFs. Ataxia telangiectasia mutated (ATM) is recognised as a chief guardian of genomic stability. To address the debate on whether RF-EMFs are genotoxic, we compared the effects of 1,800 MHz RF-EMF exposure on genomic DNA in mouse embryonic fibroblasts (MEFs) with proficient (Atm(+/+)) or deficient (Atm(-/-)) ATM...
November 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27854369/acquiring-a-record-barrier-height-for-magnetization-reversal-in-lanthanide-encapsulated-fullerene-molecules-using-dft-and-ab-initio-calculations
#15
Mukesh Kumar Singh, Gopalan Rajaraman
Ab initio calculations performed on a series of lanthanide encapsulated fullerenes reveal {DyOSc}@C82 to be one of the best host-guest pairs to offer a barrier height exceeding 1400 cm(-1). The high-symmetry environment preserved inside the cage quenches the QTM effects up to third-excited states leading to very larger barrier heights and this opens up a new possibility of obtaining attractive SMMs based on lanthanide based endohedral metallo-fullerenes (EMFs).
November 17, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27851881/magnetic-resonance-safety-and-compatibility-of-tantalum-markers-used-in-proton-beam-therapy-for-intraocular-tumors-a-7-0-tesla-study
#16
Eva Oberacker, Katharina Paul, Till Huelnhagen, Celal Oezerdem, Lukas Winter, Andreas Pohlmann, Laura Boehmert, Oliver Stachs, Jens Heufelder, Andreas Weber, Matus Rehak, Ira Seibel, Thoralf Niendorf
PURPOSE: Proton radiation therapy (PRT) is a standard treatment of uveal melanoma. PRT patients undergo implantation of ocular tantalum markers (OTMs) for treatment planning. Ultra-high-field MRI is a promising technique for 3D tumor visualization and PRT planning. This work examines MR safety and compatibility of OTMs at 7.0 Tesla. METHODS: MR safety assessment included deflection angle measurements (DAMs), electromagnetic field (EMF) simulations for specific absorption rate (SAR) estimation, and temperature simulations for examining radiofrequency heating using a bow-tie dipole antenna for transmission...
November 10, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27827378/development-of-a-source-exposure-matrix-for-occupational-exposure-assessment-of-electromagnetic-fields-in-the-interocc-study
#17
Javier Vila, Joseph D Bowman, Jordi Figuerola, David Moriña, Laurel Kincl, Lesley Richardson, Elisabeth Cardis
To estimate occupational exposures to electromagnetic fields (EMF) for the INTEROCC study, a database of source-based measurements extracted from published and unpublished literature resources had been previously constructed. The aim of the current work was to summarize these measurements into a source-exposure matrix (SEM), accounting for their quality and relevance. A novel methodology for combining available measurements was developed, based on order statistics and log-normal distribution characteristics...
November 9, 2016: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/27810173/sleep-and-sleepiness-in-environmental-intolerances-a-population-based-study
#18
Maria Nordin, Steven Nordin
BACKGROUND: About one fourth of the general population report environmental intolerance (EI) to odorous/pungent chemicals, certain buildings, electromagnetic fields (EMFs), and/or sounds. EI sufferers show various clinical features, of which sleep disturbance is one. Sleep disturbance is common also in the general population, but it is not known whether the disturbance is more prominent in EI sufferers than in individuals who do not experience EI. Therefore, EI was compared on various sleep aspects with referents without EI...
August 2016: Sleep Medicine
https://www.readbyqxmd.com/read/27808167/exposure-to-extremely-low-frequency-electromagnetic-fields-alters-the-behaviour-physiology-and-stress-protein-levels-of-desert-locusts
#19
Joanna Wyszkowska, Sebastian Shepherd, Suleiman Sharkh, Christopher W Jackson, Philip L Newland
Electromagnetic fields (EMFs) are present throughout the modern world and are derived from many man-made sources including overhead transmission lines. The risks of extremely-low frequency (ELF) electromagnetic fields are particularly poorly understood especially at high field strengths as they are rarely encountered at ground level. Flying insects, however, can approach close to high field strength transmission lines prompting the question as to how these high levels of exposure affect behaviour and physiology...
November 3, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27805245/active-schistosomiasis-severe-hypereosinophilia-and-rapid-progression-of-chronic-endomyocardial-fibrosis
#20
A O Mocumbi, C Goncalves, A Damasceno, C Carrilho
Endomyocardial fibrosis (EMF) is a neglected restrictive cardiomyopathy of unknown aetiology and unclear natural history, which causes premature deaths in endemic areas. We present the case of a 13-year-old boy from a highly endemic area, presenting with concurrent signs of chronic EMF and severe hypereosinophilia associated with active schistosomal cystitis. We discuss the possible role of this parasitic infection in determining the progression of EMF in endemic areas for both conditions.
October 23, 2016: Cardiovascular Journal of Africa
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