Base de dados : MEDLINE
Pesquisa : E07.305.245 [Categoria DeCS]
Referências encontradas : 779 [refinar]
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[PMID]:28797055
[Au] Autor:Du JH; Tu R; Zeng Y; Pan L; Zhang RC
[Ad] Endereço:College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, Fujian, China.
[Ti] Título:An experimental study on the thermal characteristics and heating effect of arc-fault from Cu core in residential electrical wiring fires.
[So] Source:PLoS One;12(8):e0182811, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The characteristics of a series direct current (DC) arc-fault including both electrical and thermal parameters were investigated based on an arc-fault simulator to provide references for multi-parameter electrical fire detection method. Tests on arc fault behavior with three different initial circuit voltages, resistances and arc gaps were conducted, respectively. The influences of circuit conditions on arc dynamic image, voltage, current or power were interpreted. Also, the temperature rises of electrode surface and ambient air were studied. The results showed that, first, significant variations of arc structure and light emitting were observed under different conditions. A thin outer burning layer of vapor generated from electrodes with orange light was found due to the extremely high arc temperature. Second, with the increasing electrode gap in discharging, the arc power was shown to have a non monotonic relationship with arc length for constant initial circuit voltage and resistance. Finally, the temperature rises of electrode surface caused by heat transfer from arc were found to be not sensitive with increasing arc length due to special heat transfer mechanism. In addition, temperature of ambient air showed a large gradient in radial direction of arc.
[Mh] Termos MeSH primário: Cobre/química
Instalação Elétrica
Fogo
[Mh] Termos MeSH secundário: Prevenção de Acidentes
Eletrodos
Temperatura Alta
Habitação
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
789U1901C5 (Copper)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170811
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182811


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[PMID]:28416002
[Au] Autor:Petri AK; Schmiedchen K; Stunder D; Dechent D; Kraus T; Bailey WH; Driessen S
[Ad] Endereço:Research Center for Bioelectromagnetic Interaction, RWTH Aachen University, Pauwelsstraße 30, 52074, Aachen, Germany. petri@femu.rwth-aachen.de.
[Ti] Título:Biological effects of exposure to static electric fields in humans and vertebrates: a systematic review.
[So] Source:Environ Health;16(1):41, 2017 Apr 17.
[Is] ISSN:1476-069X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: High-voltage direct current (HVDC) lines are the technology of choice for the transport of large amounts of energy over long distances. The operation of these lines produces static electric fields (EF), but the data reviewed in previous assessments were not sufficient to assess the need for any environmental limit. The aim of this systematic review was to update the current state of research and to evaluate biological effects of static EF. METHODS: Using the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-analyses) recommendations, we collected and evaluated experimental and epidemiological studies examining biological effects of exposure to static EF in humans (n = 8) and vertebrates (n = 40). RESULTS: There is good evidence that humans and animals are able to perceive the presence of static EF at sufficiently high levels. Hair movements caused by electrostatic forces may play a major role in this perception. A large number of studies reported responses of animals (e.g., altered metabolic, immunologic or developmental parameters) to a broad range of static EF strengths as well, but these responses are likely secondary physiological responses to sensory stimulation. Furthermore, the quality of many of the studies reporting physiological responses is poor, which raises concerns about confounding. CONCLUSION: The weight of the evidence from the literature reviewed did not indicate that static EF have adverse biological effects in humans or animals. The evidence strongly supported the role of superficial sensory stimulation of hair and skin as the basis for perception of the field, as well as reported indirect behavioral and physiological responses. Physical considerations also preclude any direct effect of static EF on internal physiology, and reports that some physiological processes are affected in minor ways may be explained by other factors. While this literature does not support a level of concern about biological effects of exposure to static EF, the conditions that affect thresholds for human detection and possible annoyance at suprathreshold levels should be investigated.
[Mh] Termos MeSH primário: Campos Eletromagnéticos/efeitos adversos
Exposição Ambiental
[Mh] Termos MeSH secundário: Animais
Aves
Instalação Elétrica
Seres Humanos
Mamíferos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170426
[Lr] Data última revisão:
170426
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170419
[St] Status:MEDLINE
[do] DOI:10.1186/s12940-017-0248-y


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[PMID]:27932298
[Au] Autor:Aydogdu A; Frasca P; D'Apice C; Manzo R; Thornton JM; Gachomo B; Wilson T; Cheung B; Tariq U; Saidel W; Piccoli B
[Ad] Endereço:Center for Computational and Integrative Biology, Rutgers University - Camden, NJ, United States. Electronic address: aa1389@scarletmail.rutgers.edu.
[Ti] Título:Modeling birds on wires.
[So] Source:J Theor Biol;415:102-112, 2017 Feb 21.
[Is] ISSN:1095-8541
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this paper we introduce a mathematical model to study the group dynamics of birds resting on wires. The model is agent-based and postulates attraction-repulsion forces between the interacting birds: the interactions are "topological", in the sense that they involve a given number of neighbors irrespective of their distance. The model is first mathematically analyzed and then simulated to study its main properties: we observe that the model predicts birds to be more widely spaced near the borders of each group. We compare the results from the model with experimental data, derived from the analysis of pictures of pigeons and starlings taken in New Jersey: two different image elaboration protocols allow us to establish a good agreement with the model and to quantify its main parameters. We also discuss the potential handedness of the birds, by analyzing the group organization features and the group dynamics at the arrival of new birds. Finally, we propose a more refined mathematical model that describes landing and departing birds by suitable stochastic processes.
[Mh] Termos MeSH primário: Comportamento Animal
Aves/fisiologia
Modelos Biológicos
[Mh] Termos MeSH secundário: Animais
Columbidae
Instalação Elétrica
Modelos Teóricos
Estorninhos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170925
[Lr] Data última revisão:
170925
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161210
[St] Status:MEDLINE


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[PMID]:28209116
[Au] Autor:Aksakal G; Kubat E; Erdogan MA; Unal CS
[Ti] Título:An unusual cause of dyspepsia due to a retained epicardial pacing wire.
[So] Source:Acta Gastroenterol Belg;79(4):509-510, 2016 Sep-Dec.
[Is] ISSN:1784-3227
[Cp] País de publicação:Belgium
[La] Idioma:eng
[Mh] Termos MeSH primário: Estimulação Cardíaca Artificial/efeitos adversos
Ponte de Artéria Coronária/instrumentação
Dispepsia
Migração de Corpo Estranho
Complicações Pós-Operatórias
Estômago
[Mh] Termos MeSH secundário: Idoso
Ponte de Artéria Coronária/métodos
Dispepsia/diagnóstico
Dispepsia/etiologia
Dispepsia/fisiopatologia
Instalação Elétrica/efeitos adversos
Endoscopia Gastrointestinal/métodos
Análise de Falha de Equipamento
Migração de Corpo Estranho/diagnóstico
Migração de Corpo Estranho/etiologia
Migração de Corpo Estranho/fisiopatologia
Seres Humanos
Masculino
Complicações Pós-Operatórias/diagnóstico
Complicações Pós-Operatórias/fisiopatologia
Estômago/diagnóstico por imagem
Estômago/lesões
Estômago/fisiopatologia
Tomografia Computadorizada por Raios X/métodos
[Pt] Tipo de publicação:CASE REPORTS; LETTER
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170403
[Lr] Data última revisão:
170403
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170218
[St] Status:MEDLINE


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[PMID]:27900329
[Au] Autor:Todt I; Karimi D; Luger J; Ernst A; Mittmann P
[Ad] Endereço:Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany.
[Ti] Título:Postinsertional Cable Movements of Cochlear Implant Electrodes and Their Effects on Intracochlear Pressure.
[So] Source:Biomed Res Int;2016:3937196, 2016.
[Is] ISSN:2314-6141
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:To achieve a functional atraumatic cochlear implantation, intracochlear pressure changes during the procedure should be minimized. Postinsertional cable movements are assumed to induce intracochlear pressure changes. The aim of this study was to observe intracochlear pressure changes due to postinsertional cable movements. Intracochlear pressure changes were recorded in a cochlear model with a micro-pressure sensor positioned in the apical region of the cochlea model to follow the maximum amplitude and pressure gain velocity in intracochlear pressure. A temporal bone mastoid cavity was attached to the model to simulate cable positioning. The compared conditions were (1) touching the unsealed electrode, (2) touching the sealed electrode, (3) cable storage with an unfixed cable, and (4) cable storage with a fixed cable. We found statistically significant differences in the occurrence of maximum amplitude and pressure gain velocity in intracochlear pressure changes under the compared conditions. Comparing the cable storage conditions, a cable fixed mode offers significantly lower maximum pressure amplitude and pressure gain velocity than the nonfixed mode. Postinsertional cable movement led to a significant pressure transfer into the cochlea. Before positioning the electrode cable in the mastoid cavity, fixation of the cable is recommended.
[Mh] Termos MeSH primário: Artefatos
Implante Coclear/métodos
Implantes Cocleares
Instalação Elétrica
Pressão
Janela da Cóclea/fisiologia
[Mh] Termos MeSH secundário: Biomimética/instrumentação
Biomimética/métodos
Desenho de Equipamento
Análise de Falha de Equipamento
Manometria/métodos
Movimento (Física)
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170224
[Lr] Data última revisão:
170224
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161201
[St] Status:MEDLINE


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[PMID]:27490209
[Au] Autor:Zhang Y; Zhang D; Zhu B; Zhang H; Sun Y; Sun C
[Ad] Endereço:Electrical Power Research Institute, Jilin Electrical Power Company Limited, Changchun 130021, China.
[Ti] Título:Effects of dietary green tea polyphenol supplementation on the health of workers exposed to high-voltage power lines.
[So] Source:Environ Toxicol Pharmacol;46:183-187, 2016 Sep.
[Is] ISSN:1872-7077
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Although it has been several decades since the focus on the effect of extremely low frequency electromagnetic fields (ELF-EMF) of high-voltage power lines on human health, no consistent conclusion has been drawn. The present study aimed to investigate the change in oxidative stress after exposure to ELF-EMFs, and potential protective effects of green tea polyphenol supplementation (GTPS) on ELF-EMFs induced oxidative stress. A total of 867 subjects, including workers with or without exposure to ELF-EMFs of 110-420kV power lines, participated and were randomized into GTPS and placebo treatment groups. Oxidative stress and oxidative damage to DNA were assessed by urinary tests of 8-isoprostane and 8-OHdG. Significant increased urinary 8-isoprostane and 8-OHdG were observed in workers with ELF-EMFs exposure, which were diminished after 12 months of GTPS. No protective effects of GTPS on oxidative stress and oxidative damage to DNA were observed after three months of GTPS withdraw. We found a negative impact of high-voltage power lines on the health of workers. Long-term GTPS could be an efficient protection against the health issues induced by high-voltage power lines.
[Mh] Termos MeSH primário: Camellia sinensis/química
Suplementos Nutricionais
Instalação Elétrica
Campos Eletromagnéticos/efeitos adversos
Exposição Ocupacional/efeitos adversos
Estresse Oxidativo/efeitos dos fármacos
Polifenóis/farmacologia
[Mh] Termos MeSH secundário: Adulto
Dinoprosta/análogos & derivados
Dinoprosta/urina
Seres Humanos
Masculino
Meia-Idade
Polifenóis/administração & dosagem
Inquéritos e Questionários
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
0 (Polyphenols); 27415-26-5 (8-epi-prostaglandin F2alpha); B7IN85G1HY (Dinoprost)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170812
[Lr] Data última revisão:
170812
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160805
[St] Status:MEDLINE


  7 / 779 MEDLINE  
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[PMID]:27295213
[Au] Autor:Tan T; Dong S; Huang Y; Liu J; Le J; Liu K
[Ad] Endereço:School of Electrical Engineering, Wuhan University, Wuhan, Hubei, China.
[Ti] Título:Improved Active Harmonic Current Elimination Based on Voltage Detection.
[So] Source:PLoS One;11(6):e0157057, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:With the increasing penetration of power electronic equipment in modern residential distribution systems, harmonics mitigation through the distributed generation (DG) interfacing converters has received significant attention. Among recently proposed methods, the so-called active resonance damper (ARD) and harmonic voltage compensator (HVC) based on voltage detection can effectively reduce the harmonic distortions in selected areas of distribution systems. However, it is found out that when traditional ARD algorithm is used to eliminate harmonic current injected by non-linear loads, its performance is constrained by stability problems and can at most eliminate half of the load harmonic currents. Thus, inspired by the duality between ARD and HVC, this paper presents a novel improved resistive active power filter (R-APF) algorithm based on integral-decoupling control. The design guideline for its parameters is then investigated through carefully analyzing the closed-loop poles' trajectory. Computer studies demonstrate that the proposed algorithm can effectively mitigate the load harmonic currents and its performance is much better than traditional ARD based on proportional control.
[Mh] Termos MeSH primário: Fontes de Energia Elétrica/normas
Instalação Elétrica/normas
Equipamentos e Provisões Elétricas/normas
Eletricidade
Fenômenos Físicos
[Mh] Termos MeSH secundário: Algoritmos
Artefatos
Eletrônica/instrumentação
Eletrônica/métodos
Limite de Detecção
Software
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170726
[Lr] Data última revisão:
170726
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160614
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0157057


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[PMID]:27184317
[Au] Autor:Hsu FW; Lin CJ; Lee YH; Chen HJ
[Ad] Endereço:Graduate Institute of Management, National Taiwan University of Science and Technology, Taipei, Taiwan.
[Ti] Título:Effects of elevation change on mental stress in high-voltage transmission tower construction workers.
[So] Source:Appl Ergon;56:101-7, 2016 Sep.
[Is] ISSN:1872-9126
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:High-voltage transmission tower construction is a high-risk operation due to the construction site locations, extreme climatic factors, elevated working surfaces, and narrow working space. To comprehensively enhance our understanding of the psychophysiological phenomena of workers in extremely high tower constructions, we carried out a series of field experiments to test and compare three working surface heights in terms of frequency-domain heart rate variability (HRV) measurements. Twelve experienced male workers participated in this experiment. The dependent variables, namely, heart rate (HR), normalized low-frequency power (nLF), normalized high-frequency power (nHF), and LF-to-HF power ratio (LF/HF), were measured with the Polar RS800CX heart rate monitor. The experimental results indicated that the task workload was similar between working surface heights. Tower construction workers perceived an increased level of mental stress as working surface height increased.
[Mh] Termos MeSH primário: Altitude
Indústria da Construção
Estresse Psicológico/fisiopatologia
[Mh] Termos MeSH secundário: Adulto
Instalação Elétrica
Frequência Cardíaca
Seres Humanos
Masculino
Meia-Idade
Local de Trabalho
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170207
[Lr] Data última revisão:
170207
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160518
[St] Status:MEDLINE


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[PMID]:26915084
[Au] Autor:Kavet R; Wyman MT; Klimley AP
[Ad] Endereço:Environment Sector, Electric Power Research Institute, Palo Alto, California, United States of America.
[Ti] Título:Modeling Magnetic Fields from a DC Power Cable Buried Beneath San Francisco Bay Based on Empirical Measurements.
[So] Source:PLoS One;11(2):e0148543, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The Trans Bay Cable (TBC) is a ±200-kilovolt (kV), 400 MW 85-km long High Voltage Direct Current (DC) buried transmission line linking Pittsburg, CA with San Francisco, CA (SF) beneath the San Francisco Estuary. The TBC runs parallel to the migratory route of various marine species, including green sturgeon, Chinook salmon, and steelhead trout. In July and August 2014, an extensive series of magnetic field measurements were taken using a pair of submerged Geometrics magnetometers towed behind a survey vessel in four locations in the San Francisco estuary along profiles that cross the cable's path; these included the San Francisco-Oakland Bay Bridge (BB), the Richmond-San Rafael Bridge (RSR), the Benicia-Martinez Bridge (Ben) and an area in San Pablo Bay (SP) in which a bridge is not present. In this paper, we apply basic formulas that ideally describe the magnetic field from a DC cable summed vectorially with the background geomagnetic field (in the absence of other sources that would perturb the ambient field) to derive characteristics of the cable that are otherwise not immediately observable. Magnetic field profiles from measurements taken along 170 survey lines were inspected visually for evidence of a distinct pattern representing the presence of the cable. Many profiles were dominated by field distortions unrelated to the cable caused by bridge structures or other submerged objects, and the cable's contribution to the field was not detectable. BB, with 40 of the survey lines, did not yield usable data for these reasons. The unrelated anomalies could be up to 100 times greater than those from the cable. In total, discernible magnetic field profiles measured from 76 survey lines were regressed against the equations, representing eight days of measurement. The modeled field anomalies due to the cable (the difference between the maximum and minimum field along the survey line at the cable crossing) were virtually identical to the measured values. The modeling yielded a pooled cable depth below the bay floor of 2.06 m (±1.46 std dev), and estimated the angle to the horizontal of the imaginary line connecting the cross-sectional center of the cable's two conductors (0.1143 m apart) as 178.9° ±61.9° (std dev) for Ben, 78.6°±37.0° (std dev) for RSR, and 139.9°±27.4° (std dev) for SP. The mean of the eight daily average currents derived from the regressions was 986 ±185 amperes (A) (std dev), as compared to 722 ±95 A (std dev) provided by Trans Bay Cable LLC. Overall, the regressions based on fundamental principles (Biot Savart law) and the vectorial summation of cable and geomagnetic fields provide estimates of cable characteristics consistent with plausible expectations.
[Mh] Termos MeSH primário: Fontes de Energia Elétrica
Campos Magnéticos
[Mh] Termos MeSH secundário: Migração Animal
Animais
Baías
Fontes de Energia Elétrica/efeitos adversos
Instalação Elétrica/efeitos adversos
Monitoramento Ambiental
Estuários
Peixes/fisiologia
Campos Magnéticos/efeitos adversos
Magnetometria
Modelos Teóricos
São Francisco
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Em] Mês de entrada:1607
[Cu] Atualização por classe:160310
[Lr] Data última revisão:
160310
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160226
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0148543


  10 / 779 MEDLINE  
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[PMID]:26406099
[Au] Autor:Wu H; Shen G; Chen Y
[Ad] Endereço:Biomedical Instrument Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P.R. China.
[Ti] Título:A radiation emission shielding method for high intensity focus ultrasound probes.
[So] Source:Biomed Mater Eng;26 Suppl 1:S959-66, 2015.
[Is] ISSN:1878-3619
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Electromagnetic compatibility (EMC) is a key issue in the design and development of safe and effective medical instruments. The treatment probes of high intensity focused ultrasound (HIFU) systems not only receive and transmit electromagnetic waves, but also radiate ultrasound waves, resulting in electromagnetic coupling. In this paper, an electromagnetic shielding method involving the enclosure of the probe in a copper wire mesh was introduced. First, sound pressure distribution simulations and measurements were performed using a hydrophone in order to evaluate the effects of the wire mesh on the acoustic performance of the HIFU system. The results indicated that the wire mesh did not disturb the normalized sound pressure field. In addition, the attenuation of the maximum pressure in the focal plane was equal to 6.2%. Then, the electronic emission level was tested in a chamber. After the implementation of the wire mesh, the 10-100 MHz frequency band radiation was suppressed, and the HIFU system satisfied the national EMC standards.
[Mh] Termos MeSH primário: Acústica/instrumentação
Ondas de Choque de Alta Energia
[Mh] Termos MeSH secundário: Cobre/química
Instalação Elétrica
Radiação Eletromagnética
Desenho de Equipamento
Ondas de Choque de Alta Energia/efeitos adversos
Ondas de Choque de Alta Energia/uso terapêutico
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
789U1901C5 (Copper)
[Em] Mês de entrada:1607
[Cu] Atualização por classe:150926
[Lr] Data última revisão:
150926
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150926
[St] Status:MEDLINE
[do] DOI:10.3233/BME-151390



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