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Literatura académica sobre el tema "RF-EMF Exposure"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "RF-EMF Exposure"

Zeleke, Berihun M., Christopher Brzozek, Chhavi R. Bhatt, Michael J. Abramson, Frederik Freudenstein, Rodney J. Croft, Peter Wiedemann y Geza Benke. "Wi-fi related radiofrequency electromagnetic fields (RF-EMF): a pilot experimental study of personal exposure and risk perception". Journal of Environmental Health Science and Engineering 19, n.º 1 (23 de marzo de 2021): 671–80. http://dx.doi.org/10.1007/s40201-021-00636-7.

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AbstractThe impact of providing people with an objectively measured personal radiofrequency electromagnetic fields (RF-EMF) exposure information on the risk perception of people is not well understood. We conducted an experimental study, among three groups of participants, to investigate the risk perception of people towards RF-EMF from Wi-Fi sources (ISM 2.4 GHz) by providing participants with either basic text, precautionary information, or a summary of their personal RF-EMF exposure measurement levels. Participants provided with personal RF-EMF exposure measurement information were more confident in protecting themselves from RF-EMF exposure, compared to those provided with only basic information. Nonetheless, neither the exposure perception nor the risk perception of people to Wi-Fi related RF-EMF differed by the type of information provided. The measured Wi-Fi signal levels were far below international exposure limits. Furthermore, self-rated levels of personal RF-EMF exposure perception were not associated with objectively measured RF-EMF exposure levels. Providing people with objectively measured information may help them build confidence in protecting themselves from Wi-Fi related RF-EMF exposure.

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Goh, Jaeseong, Dongwha Suh, Gyuyeon Park, Sangbong Jeon, Youngseung Lee, Nam Kim y Kiwon Song. "1.7 GHz long-term evolution radiofrequency electromagnetic field with stable power monitoring and efficient thermal control has no effect on the proliferation of various human cell types". PLOS ONE 19, n.º 5 (7 de mayo de 2024): e0302936. http://dx.doi.org/10.1371/journal.pone.0302936.

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Long-term evolution (LTE) radiofrequency electromagnetic field (RF-EMF) is widely used in communication technologies. Thus, the influence of RF-EMF on biological systems is a major public concern and its physiological effects remain controversial. In our previous study, we showed that continuous exposure of various human cell types to 1.7 GHz LTE RF-EMF at a specific absorption rate (SAR) of 2 W/Kg for 72 h can induce cellular senescence. To understand the precise cellular effects of LTE RF-EMF, we elaborated the 1.7 GHz RF-EMF cell exposure system used in the previous study by replacing the RF signal generator and developing a software-based feedback system to improve the exposure power stability. This refinement of the 1.7 GHz LTE RF-EMF generator facilitated the automatic regulation of RF-EMF exposure, maintaining target power levels within a 3% range and a constant temperature even during the 72-h-exposure period. With the improved experimental setup, we examined the effect of continuous exposure to 1.7 GHz LTE RF-EMF at up to SAR of 8 W/Kg in human adipose tissue-derived stem cells (ASCs), Huh7, HeLa, and rat B103 cells. Surprisingly, the proliferation of all cell types, which displayed different growth rates, did not change significantly compared with that of the unexposed controls. Also, neither DNA damage nor cell cycle perturbation was observed in the 1.7 GHz LTE RF-EMF-exposed cells. However, when the thermal control system was turned off and the subsequent temperature increase induced by the RF-EMF was not controlled during continuous exposure to SAR of 8 W/Kg LTE RF-EMF, cellular proliferation increased by 35.2% at the maximum. These observations strongly suggest that the cellular effects attributed to 1.7 GHz LTE RF-EMF exposure are primarily due to the induced thermal changes rather than the RF-EMF exposure itself.

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Zeleke, Berihun, Christopher Brzozek, Chhavi Bhatt, Michael Abramson, Rodney Croft, Frederik Freudenstein, Peter Wiedemann y Geza Benke. "Personal Exposure to Radio Frequency Electromagnetic Fields among Australian Adults". International Journal of Environmental Research and Public Health 15, n.º 10 (12 de octubre de 2018): 2234. http://dx.doi.org/10.3390/ijerph15102234.

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The measurement of personal exposure to radiofrequency electromagnetic fields (RF-EMFs) is important for epidemiological studies. RF-EMF exposure can be measured using personal exposimeters that register RF-EMFs over a wide range of frequency bands. This study aimed to measure and describe personal RF-EMF exposure levels from a wide range of frequency bands. Measurements were recorded from 63 participants over an average of 27.4 (±4.5) hours. RF-EMF exposure levels were computed for each frequency band, as well as from downlink (RF from mobile phone base station), uplink (RF from mobile phone handsets), broadcast, and Wi-Fi. Participants had a mean (±SD) age of 36.9 ± 12.5 years; 66.7% were women; and almost all (98.2%) from urban areas. A Wi-Fi router at home was reported by 61 participants (96.8%), with 38 (61.2%) having a Wi-Fi enabled smart TV. Overall, 26 (41.3%) participants had noticed the existence of a mobile phone base station in their neighborhood. On average, participants estimated the distance between the base station and their usual residence to be about 500 m. The median personal RF-EMF exposure was 208 mV/m. Downlink contributed 40.4% of the total RF-EMF exposure, followed by broadcast (22.4%), uplink (17.3%), and Wi-Fi (15.9%). RF-EMF exposure levels on weekdays were higher than weekends (p < 0.05). Downlink and broadcast are the main contributors to total RF-EMF personal exposure. Personal RF-EMF exposure levels vary according to day of the week and time of day.

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Kim, Ju Hwan, Kyung Hwun Chung, Yeong Ran Hwang, Hye Ran Park, Hee Jung Kim, Hyung-Gun Kim y Hak Rim Kim. "Exposure to RF-EMF Alters Postsynaptic Structure and Hinders Neurite Outgrowth in Developing Hippocampal Neurons of Early Postnatal Mice". International Journal of Molecular Sciences 22, n.º 10 (19 de mayo de 2021): 5340. http://dx.doi.org/10.3390/ijms22105340.

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Exposure to radiofrequency electromagnetic fields (RF-EMFs) has increased rapidly in children, but information on the effects of RF-EMF exposure to the central nervous system in children is limited. In this study, pups and dams were exposed to whole-body RF-EMF at 4.0 W/kg specific absorption rate (SAR) for 5 h per day for 4 weeks (from postnatal day (P) 1 to P28). The effects of RF-EMF exposure on neurons were evaluated by using both pups’ hippocampus and primary cultured hippocampal neurons. The total number of dendritic spines showed statistically significant decreases in the dentate gyrus (DG) but was not altered in the cornu ammonis (CA1) in hippocampal neurons. In particular, the number of mushroom-type dendritic spines showed statistically significant decreases in the CA1 and DG. The expression of glutamate receptors was decreased in mushroom-type dendritic spines in the CA1 and DG of hippocampal neurons following RF-EMF exposure. The expression of brain-derived neurotrophic factor (BDNF) in the CA1 and DG was significantly lower statistically in RF-EMF-exposed mice. The number of post-synaptic density protein 95 (PSD95) puncta gradually increased over time but was significantly decreased statistically at days in vitro (DIV) 5, 7, and 9 following RF-EMF exposure. Decreased BDNF expression was restricted to the soma and was not observed in neurites of hippocampal neurons following RF-EMF exposure. The length of neurite outgrowth and number of branches showed statistically significant decreases, but no changes in the soma size of hippocampal neurons were observed. Further, the memory index showed statistically significant decreases in RF-EMF-exposed mice, suggesting that decreased synaptic density following RF-EMF exposure at early developmental stages may affect memory function. Collectively, these data suggest that hindered neuronal outgrowth following RF-EMF exposure may decrease overall synaptic density during early neurite development of hippocampal neurons.

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Chiaramello, Emma, Marta Bonato, Serena Fiocchi, Gabriella Tognola, Marta Parazzini, Paolo Ravazzani y Joe Wiart. "Radio Frequency Electromagnetic Fields Exposure Assessment in Indoor Environments: A Review". International Journal of Environmental Research and Public Health 16, n.º 6 (17 de marzo de 2019): 955. http://dx.doi.org/10.3390/ijerph16060955.

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Exposure to radiofrequency (RF) electromagnetic fields (EMFs) in indoor environments depends on both outdoor sources such as radio, television and mobile phone antennas and indoor sources, such as mobile phones and wireless communications applications. Establishing the levels of exposure could be challenging due to differences in the approaches used in different studies. The goal of this study is to present an overview of the last ten years research efforts about RF EMF exposure in indoor environments, considering different RF-EMF sources found to cause exposure in indoor environments, different indoor environments and different approaches used to assess the exposure. The highest maximum mean levels of the exposure considering the whole RF-EMF frequency band was found in offices (1.14 V/m) and in public transports (0.97 V/m), while the lowest levels of exposure were observed in homes and apartments, with mean values in the range 0.13–0.43 V/m. The contribution of different RF-EMF sources to the total level of exposure was found to show slightly different patterns among the indoor environments, but this finding has to be considered as a time-dependent picture of the continuous evolving exposure to RF-EMF.

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Vilić, Marinko, Ivona Žura Žaja, Mirta Tkalec, Anamaria Štambuk, Maja Šrut, Goran Klobučar, Krešimir Malarić, Perica Tucak, Selim Pašić y Ivana Tlak Gajger. "Effects of a radio frequency electromagnetic field on honey bee larvae (Apis mellifera) differ in relation to the experimental study design". Veterinarski arhiv 91, n.º 4 (15 de septiembre de 2021): 427–35. http://dx.doi.org/10.24099/vet.arhiv.1321.

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Exposure to radiofrequency electromagnetic fields (RF-EMF) at the operating frequencies of different communication devices can cause various biological effects. However, there is a lack of studies on the oxidative stress response and genotoxicity in the honey bee (Apis mellifera) after exposure to RF-EMF. In this study, we investigated the oxidative stress and DNA damage in honey bee larvae situated in waxcomb cells, exposed to modulated RF-EMF 23 Vm-1. The glutathione S-transferase activity decreased, whereas the catalase activity increased significantly in the honey bee larvae upon RF-EMF exposure. Superoxide dismutase activity, the level of lipid peroxidation, and DNA damage were not statistically altered in exposed honey bee larvae when compared to the control group. These results suggest that the biological effects of modulated RF-EMF in honey bee larvae depend on the exposure design.

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Freudenstein, Frederik, Peter M. Wiedemann y Tim W. C. Brown. "Exposure Perception as a Key Indicator of Risk Perception and Acceptance of Sources of Radio Frequency Electromagnetic Fields". Journal of Environmental and Public Health 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/198272.

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The presented survey was conducted in six European countries as an online study. A total of 2454 subjects participated. Two main research questions were investigated: firstly, how does the cognitive, moral, and affective framing of radio frequency electromagnetic field (RF EMF) exposure perception influence RF EMF risk perception? Secondly, can the deployment of mobile phone base stations have greater acceptance with RF EMF exposure reduction? The findings with respect to the first question clearly indicated that the cognitive framed exposure perception is the main determinant of RF EMF risk perception. The concomitant sensitivity to exposure strength offers an opportunity to improve the acceptance of base stations by exposure reduction. A linear regression analysis supported this assumption: in a fictional test situation, exposure reduction improved the acceptance of base stations, operationalized as the requested distance of the base station from one’s own home. Furthermore, subjects with high RF EMF risk perception were most sensitive to exposure reduction. On average, a 70% exposure reduction reduced the requested distance from about 2000 meters to 1000 meters. The consequences for risk communication are discussed.

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Alexias, Aris, Yiannis Kiouvrekis, Vasiliki Softa, Constantin Kappas, Charilaos Tyrakis y Kiki Theodorou. "RF-EMF EXPOSURE LEVELS IN SENSITIVE LAND USE IN GREECE: EDUCATIONAL UNITS CENSUS IN THE MUNICIPALITY OF KORYDALLOS". Radiation Protection Dosimetry 190, n.º 2 (junio de 2020): 193–99. http://dx.doi.org/10.1093/rpd/ncaa090.

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Abstract Background The growing popularity of mobile phones and the expansion of network infrastructure in Greece have raised concerns about the possible negative health effects on sensitive groups, such as children, from exposure to long-term radiofrequency electromagnetic fields (RF-EMFs). Aims The objective of this study is to estimate mean RF-EMF exposure levels of primary and secondary education schools located in the municipality of Korydallos, Athens, Greece. Methods We performed measurements to all the schools units ($n=62$) in the region in order to calculate the mean value for RF-EMF exposure in the range of 27 MHz–3 GHz, which covers the whole spectrum of RF-EMF sources. Results At the $97.5\%$ of schools found in Korydallos region, the exposure level is at least 2200 times below the Greek exposure limits. Conclusion The exposure levels in the locations tested are both below $60\%$ of the highest limit set by the International Commission on Non-Ionizing Radiation Protection regarding school exposures.

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Veerana, Mayura, Nan-Nan Yu, Si-Jin Bae, Ikhwan Kim, Eun-Seong Kim, Wirinthip Ketya, Hak-Yong Lee, Nam-Young Kim y Gyungsoon Park. "Enhancement of Fungal Enzyme Production by Radio-Frequency Electromagnetic Fields". Journal of Fungi 8, n.º 11 (10 de noviembre de 2022): 1187. http://dx.doi.org/10.3390/jof8111187.

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Enzyme production by microorganisms on an industrial scale has demonstrated technical bottlenecks, such as low efficiency in enzyme expression and extracellular secretion. In this study, as a potential tool for overcoming these technical limits, radio-frequency electromagnetic field (RF-EMF) exposure was examined for its possibility to enhance production of an enzyme, α-amylase, in a filamentous fungus, Aspergillus oryzae. The RF-EMF perfectly resonated at 2 GHz with directivity radiation pattern and peak gain of 0.5 dB (0.01 Watt). Total protein concentration and activity of α-amylase measured in media were about 1.5–3-fold higher in the RF-EMF exposed (10 min) sample than control (no RF-EMF) during incubation (the highest increase after 16 h). The level of α-amylase mRNA in cells was approximately 2–8-fold increased 16 and 24 h after RF-EMF exposure for 10 min. An increase in vesicle accumulation within fungal hyphae and the transcription of some genes involved in protein cellular trafficking was observed in RF-EMF-exposed samples. Membrane potential was not changed, but the intracellular Ca2+ level was elevated after RF-EMF exposure. Our results suggest that RF-EMF can increase the extracellular level of fungal total proteins and α-amylase activity and the intracellular level of Ca2+.

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Vargová, Blažena, Juraj Kurimský, Roman Cimbala, Michal Kosterec, Igor Majláth, Natália Pipová, Piotr Tryjanowski, Łukasz Jankowiak y Viktoria Majlathova. "Ticks and radio-frequency signals: behavioural response of ticks (Dermacentor reticulatus) in a 900 MHz electromagnetic field". Systematic and Applied Acarology 22, n.º 5 (5 de mayo de 2017): 683. http://dx.doi.org/10.11158/saa.22.5.7.

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The electromagnetic field (EMF) is present in the environment throughout the world and encompasses both natural and human-made sources of electromagnetic fields. It has been shown that EMF influences a variety of biological systems, including the behavioural responses of both vertebrates and invertebrates. As such, determining the effects of the EMF on the ecosystem in detail may be important for understanding the ecology and biology of organisms, particularly those, such as ticks, that are important in disease transmission. Our main goal was to determine if the tick, Dermacentor reticulatus, interacts with the EMF. An experimental behavioural test of tick sensitivity to radio frequency power radiation was performed under laboratory conditions. Tests were performed in an electromagnetic compatibility laboratory in a radio frequency electromagnetic field (RF-EMF) anechoic chamber. Ticks were irradiated using a Double-Ridged Waveguide Horn Antenna with 900 MHz RF-EMF. The applied radio-frequency power was tuned below the proposed limit for public exposure to mobile phone base stations. We found that exposure induces an immediate tick locomotor response manifested either in a previously unreported jerking movement of the whole body or in jerking of the first pair of legs. Overall, ticks exhibited significantly greater movement in the presence of the RF-EMF. Significant sex differences relative to RF-EMF exposure were observed in both response variables. In the presence of RF-EMF, body jerking by females was greater than in males and vice versa for leg jerks. This study represents the first experimental evidence of a behavioural response of D. reticulatus ticks to exposure to RF-EMF.

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Tesis sobre el tema "RF-EMF Exposure"

Jomaa, Kassem. "Caractérisation du champ proche électromagnétique et exposition professionnelle aux ondes RF en milieu industriel". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT111/document.

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L'étude des émissions rayonnées d'une source dans tout l'espace, est essentielle pour l'analyse dosimétriques et l’analyse des interférences électromagnétiques. L'importance du dernier augmentent en raison de la nécessité d'avoir une prédiction de la fiabilité des circuits électroniques. De plus, l'utilisation quotidienne des dispositifs et des systèmes émettant des champs électromagnétiques radiofréquences ne cesse d'augmenter. Certains de ces dispositifs fonctionnent à proximité du corps humain, et les opérateurs se trouvent dans la région des champs proches de la source rayonnante, et ils sont exposés à des niveaux de champs électromagnétiques pouvant être élevés. Pour cette raison, l'analyse dosimétrique, qui passe par une cartographie tridimensionnelle (3D) au voisinage de la source rayonnante, doit être effectuée. Pour ce type d'applications, plusieurs scans des champs proches doivent être effectués dans différents plans afin de construire la cartographie de champs 3D. Étant un processus difficile dans les études de compatibilité électromagnétique, la caractérisation en champ proche est traitée par plusieurs algorithmes qui proposent différentes approches pour réaliser le scanning requis au voisinage de la source rayonnante.Dans ce travail, nous introduisons un système de scanning 3D avec des sondes de champ magnétique à trois axes à faible coût. Le fait de disposer de telles sondes permet la mesure simultanée des trois composantes du champ magnétique sur la base d'un seul scan au voisinage du dispositif testé. Les sondes conçues se composent de trois boucles orthogonales combinées ensemble; la première sonde contient trois boucles conventionnelles réunies dans un cube en plastique d'une dimension totale de 10 × 12 × 13 mm3, tandis que la deuxième sonde est une sonde PCB imprimée sur un substrat FR4 de 3,2 mm avec une dimension réduite de 9 × 9 × 3,2 mm3. Les sondes conçues ont été étalonnées avec une cellule TEM et les facteurs d'antenne correspondants ont été extraits. Le système de scanning présenté utilise comme un instrument de mesure un oscilloscope RF- 4 canaux, qui donne la possibilité de mesurer à la fois dans le domaine temporel et dans le domaine fréquentiel.La deuxième partie de cette thèse présente un algorithme de reconstruction basé sur la méthode du spectre d'ondes planes. Afin de réduire le nombre des scans et donc les exigences de temps, l'algorithme présenté nécessite juste un scan en champ proche 2D des composantes de champ, pour reconstruire la distribution du champ magnétique 3D au-dessus du dispositif rayonnant.La troisième partie de la thèse est consacrée à l'analyse dosimétrique des champs électromagnétiques rayonnés à proximité des systèmes RFID et des machines de soudage RF. L'évaluation de l'exposition en champ proche des champs rayonnés des antennes de lecture RFID, fonctionnant à 13,56 MHz et utilisées dans les bibliothèques, a été réalisée. Les mesures du champ magnétique près de l'antenne ont été établies à l'aide des sondes conçues. Les résultats sont ensuite analysés et comparés aux réglementations des normes européennes et des lignes directrices de l'ICNIRP. En outre, l'exposition aux champs électromagnétiques RF des travailleurs à proximité de machines de soudage RF dans un environnement industriel est étudiée. Ces machines, fonctionnant à 27 MHz, émettent de forts rayonnements et l'exposition a eu lieu dans la région de champ proche. La distribution spatiale des champs électromagnétiques dans cette région est étudiée à la fois dans des simulations numériques et des mesures réelles
The analysis of radiated emissions from a source throughout the space, is very essential for both dosimetric and electromagnetic interference analysis. The concerns about the latter are growing because of the need to have prediction of the system reliability of the electronic circuits. Moreover the everyday use of devices and systems emitting radio frequency electromagnetic fields is continuously increasing. Some of these devices are operating in the vicinity of human body, and operators are in the near-field region of the radiating source, and they are exposed to electromagnetic fields. For this reason, dosimetric analysis, that shows the necessity of having three dimensional (3D) field mapping in the vicinity of the radiating source, should be performed. For this kind of applications, several scans of the near fields should be done within different planes in order to build the 3D field mapping. Being a challenging process in electromagnetic compatibility studies, near field characterization is being treated by several algorithms that propose different approaches to achieve the required scanning on the radiating source.In this work, we introduce a 3D scanning system with a low cost three axis magnetic field probes. Having such probes allow the simultaneous measure of the three components of the magnetic field based on a single planner scan above the device under test. The designed probes consist of three orthogonal loops combined together; the first probe contains three conventional loops joined in a plastic cube with a total dimension of 10×12×13 mm3, whereas the second probe is a PCB probe printed on an FR4 substrate of 3.2 mm with a reduced dimension of 9×9×3.2 mm3. The designed probes were calibrated with a TEM cell and the corresponding antenna factors were extracted. The presented scanning system uses an oscilloscope as a measuring instrument that gives the possibility of both time and frequency domain measurements. The second part of this thesis presents a reconstruction algorithm based on plane wave spectrum method. In order to reduce the number of scans and hence the time requirements, the presented algorithm requires just a 2D near field scan of the field components, to reconstruct the 3D magnetic field distribution above the radiating device.The third part of the thesis is devoted for the dosimetric analysis of the radiated electromagnetic fields near RFID systems and RF-welding machines. The near-field exposure assessment of the radiated fields from RFID reader antennas operating at 13.56 MHz and used in Libraries was performed. The measurements of the magnetic field near the antenna were established using the designed probes. The results are then analyzed and compared to the regulations in European Directives and ICNIRP Guidelines. Moreover, the exposure to RF electromagnetic fields of workers near RF-welding machines in industrial environment is studied. These machines, operating at 27 MHz, emit strong radiation and the exposure takes place in the near-field region. The spatial distribution of the electromagnetic fields in this region is studied in both numerical simulations and measurements

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Badran, Tamer. "Balayage de spectre utilisant les récepteurs radio logicielle". Electronic Thesis or Diss., Sorbonne université, 2020. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2020SORUS264.pdf.

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L'architecture conventionnelle utilisée par toutes les publications précédentes pour le récepteur de balayage de spectre est basée sur le CAN en BB, donc il a une consommation d'énergie élevée, une complexité plus élevée et souffre d'inadéquations de circuits et de non-linéarité. Dans ce travail, nous proposons d'utiliser un récepteur RF basé sur CAN delta-sigma en PB. Les CAN PB DS ajustables précédemment signalés implémentée de manière complexe. Nous présentons une implémentation efficace du CAN PB DS accordable. Un récepteur de détection de spectre, basé sur l'architecture frontale RF à faible consommation d'énergie proposée dans cette thèse, est également proposé. Le récepteur complet proposé ne souffre pas d'un déséquilibre 1/Q. Les résultats de simulation pour montrer l'impact de la non-linéarité du circuit sur les performances sont présentés. Une implémentation de circuit d'un backend numérique du système proposé est présentée. Cette implémentation comprend un mélangeur à conversion descendante efficace, un filtre de décimation, un bloc FFT et un module de détection d'énergie. L'implémentation a été validée à l'aide l'outil SignalTab. Des études, ne présentent que des résultats analytiques ou de simulation, visant à montrer l'impact du déséquilibre 1/Q sur les performances de détection du spectre ont déjà été publiées. Dans ce travail, nous présentons la première mesure matérielle du déséquilibre I/Q sur les performances de détection du spectre. Dans le domaine médical, nous présentons pour la première fois une étude de l'effet de l'exposition aux RF-EMF sur les nouveau-nés via une acquisition simultanée de signaux RF et de paramètres physiologiques
Spectrum sensing applications cover wide variety, such as efficient utilization of frequency spectrum, and in medical applications. The conventional architecture used by all the previous publications for spectrum sensing receiver is based on baseband ADC, hence it has high power consumption, higher complexity, and suffers from circuit mismatches and nonlinearity. In this work, we propose using an RF receiver based on bandpass delta-sigma ADC. It is much more convenient to have a tunable BP ΔΣ ADC to simplify the spectrum sweeping task. The previously reported tunable BP ΔΣ ADC’s are implementing tunability in a complex manner. We present an efficient implementation of tunable BP ΔΣ ADC with fixed ratio between the sampling frequency and center frequency. That fixed ratio further simplifies the implementation of the down conversion mixer and decimation filter which serve as the digital backend of the receiver. A spectrum sensing receiver, based on the power-efficient RF front end architecture proposed in this thesis, is also proposed. The proposed complete receiver does not suffer from I/Q imbalance that highly affect the spectrum sensing performance. Simulation results to show the circuit nonlinearity impact on the performance are presented. A circuit implementation of a digital backend of the proposed system is presented. This implementation comprises an efficient down conversion mixer, decimation filter, custom FFT block, and energy detection module. The implementation was validated on Altera FPGA using the on-chip logic analyzer via the SignalTab tool.Studies to show the impact of I/Q imbalance on spectrum sensing performance were previously published. Nevertheless, those publications presented only either analytical or simulation results. In this work, we present the first hardware measurement of the I/Q imbalance on spectrum sensing performance using a commercial SDR transceiver platform.In the medical field, we also present for the first time a study of the effect of RF-EMF exposure on neonates by performing a simultaneous acquisition of RF signals along with recording the physiological parameters of neonates. Using R-Studio, the stationarity of the signals to be correlated was checked, a transformation was performed on the non-stationary signals. Finally, cross correlation between the acquired RF signal (average of the whole spectrum or in a specific band) and each of the recorded physiological parameters did not show an observable impact of RF-EMF exposure on neonates

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Capítulos de libros sobre el tema "RF-EMF Exposure"

Yekeh Yazdandoost, Kamya y Ilkka Laakso. "Exposure to RF EMF from 5G Handheld Devices". En 13th EAI International Conference on Body Area Networks, 317–22. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29897-5_27.

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Curcio, Giuseppe. "Human Psychomotor Performance Under the Exposure to Mobile Phones-Like Electromagnetic Fields". En Advances in Computer and Electrical Engineering, 923–36. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7598-6.ch067.

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The first studies on humans addressing cognitive functioning changes as a consequence of radiofrequency (RF) EMFs exposure date back to almost 20 years ago. The effects on human behavior showed in those pioneering works indicated an improvement of performance under the exposure to the signal, compared with sham exposure. These first and striking results were not fully replicated by subsequent studies that were characterized by a more methodological robustness and attention to exposure aspects. In accordance with this view, latest reviews and metanalyses have confirmed the paucity of evidence and the lack of reliability of psychomotor and cognitive effects of acute RF EMF exposure on human volunteers, particularly when assessed in well controlled laboratory settings. Thus, despite the public opinion about potential biologic effects of acute RF EMFs irradiation, it can be concluded that to date there is substantial lack of evidence about a negative influence of non-ionizing radiations on cognitive functioning in humans.

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Curcio, Giuseppe. "Human Psychomotor Performance Under the Exposure to Mobile Phones-Like Electromagnetic Fields". En Encyclopedia of Information Science and Technology, Fourth Edition, 6124–35. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2255-3.ch532.

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The first studies on humans addressing cognitive functioning changes as a consequence of radiofrequency (RF) EMFs exposure, date back to almost 20 years ago. The effects on human behaviour showed in those pioneering works indicated a somewhat improvement of performance under the exposure to the signal, compared with sham exposure. These first and striking results were not fully replicated by subsequent studies that were characterized by a more methodological robustness and attention to exposure aspects. In accordance with this view, latest reviews and metanalyses have confirmed the paucity of evidence and the lack of reliability of psychomotor and cognitive effects of acute RF EMF exposure on human volunteers, particularly when assessed in well controlled laboratory settings. Thus, despite the public opinion about potential biologic effects of acute RF EMFs irradiation, it can be concluded that to date there is substantial lack of evidence about a negative influence of non-ionizing radiations on cognitive functioning in humans.

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Mortazavi, SAR, Kanu Megha, Seyedeh Fatemeh Shams, Sahar Mohammadi y SMJ Mortazavi. "Radiation from Mobile Phones and Cell Towers, Risks, and Protection". En An Introduction to Non-Ionizing Radiation, 292–325. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136890123010013.

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Modern life is strongly associated with new technologies such as telecommunication and wireless devices. These new technologies strongly affect the way people communicate, learn, train, think and solve their problems. Today, modern cell phones not only send and receive phone calls, but they also allow people to send and receive short messages, and e-mails, share photos and videos, write, edit and share documents, play games, listen to music, watch movies, surf the Internet, find an address using GPS (Global Positioning Systems) and use a wide range of applications. Given this consideration, excessive use of smartphones is associated with growing global concerns over the health effects of radiofrequency electromagnetic fields (RF-EMF) generated by these devices. As discussed by WHO, considering the very large number of people who use mobile phones, even a small increase in the risk of adverse health effects, either cancer or other health effects, could have key public health implications. WHO believes that research about these health effects is mostly focused on potential adverse effects of mobile phones, not their base stations, because the RF-EMF levels of mobile phones are 3 orders of magnitude higher than those of base stations. Therefore, in this chapter, due to the greater likelihood of adverse health effects of handsets, we mainly focused on reviewing the current scientific evidence on health risks associated with mobile phones. However, the health effects of RF-EMF exposure on people living in the proximity of mobile base stations are also reviewed.

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Chandan, Rakesh Kumar, Prem Nath Suman y Keshav Sinha. "The Environmental Impact of 5G Technology on Humans and Animals". En Advances in Library and Information Science, 48–68. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-7258-0.ch003.

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5G has the potential to become the future communication technology as it has the capability to provide faster download speeds, extremely low latency, and higher capacity. The deployment of 5G will be as a wi-fi that will cover the entire globe. It will serve an elevated number of devices than the previous technology; therefore, the distribution of radiofrequency electromagnetic fields (RF-EMF) will grow rapidly. Although no direct adverse effect has been reported by the service providers, the real health impact of this advanced technology is still under investigation. It is expected that the mm-wave frequency range (30-300 GHz) is ideal for 5G technology, and the devices, in this operating range, will work at very low power due to which small penetration is supposed to occur, but it will require a high density of small cells. It will increase the chances of human exposure to RF-EMF. In this chapter, a theoretical framework is used to describe the effect of 5G technology on humans and animals and also the rumors related to the adaptation of 5G technology.

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Valentini, Elia y Giuseppe Curcio. "Mobile Phones-Like Electromagnetic Fields Effects on Human Psychomotor Performance". En Encyclopedia of Mobile Phone Behavior, 694–704. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8239-9.ch057.

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Nowadays nearly more than half of human beings on the planet are directly or indirectly exposed to an “evolutionary” novel physical agent: the electromagnetic fields (EMFs) emitted by cellular phones, base stations, as well as other types of wireless communication technologies. More than 10 years ago several studies reported that cognitive functions of human beings may have been altered while exposed to radiofrequency (RF) EMFs. Yet, the genuine effect of these non-ionizing radiations on human behaviour was not replicated by several other recent and more methodologically robust studies. Latest reviews and metanalyses confirmed the paucity of evidence in favour of psychomotor and cognitive effects of acute RF EMF exposure on human volunteers in well controlled laboratory settings. Thus, despite persisting concerns on potential biologic effects of acute RF EMFs irradiation, there is substantial lack of evidence that RF radiation can affect cognitive functions in humans.

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"EMF: RF device end of things – low-exposure user terminal radio design concepts". En Low Electromagnetic Emission Wireless Network Technologies: 5G and beyond, 185–205. Institution of Engineering and Technology, 2019. http://dx.doi.org/10.1049/pbte084e_ch8.

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Actas de conferencias sobre el tema "RF-EMF Exposure"

Xu, Bo, Mats Gustafsson, Shuai Shi, Zhinong Ying y Sailing He. "Upper Bound Study of 5G RF EMF Exposure". En 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2018. http://dx.doi.org/10.1109/apusncursinrsm.2018.8609310.

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Celaya-Echarri, M., L. Azpilicueta, P. Lopez-Iturri, F. A. Rodriguez-Corbo, V. Ramos y F. Falcone. "Analysis of Personal RF-EMF radiation exposure within Public Transportation Buses". En 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf35879.2020.9329729.

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Piroddi, A. y M. Torregiani. "5G RBS And UE Modelling For Assessment of RF EMF exposure". En 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2019. http://dx.doi.org/10.1109/iceaa.2019.8879101.

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Yamaguchi-Sekino, Sachiko, Miwa Ikuyo, Kazuhisa Kamegai, Masao Taki, Teruo Onishi y Soichi Watanabe. "Effects of Feedback Report with Objectively Measured Radio-Frequency Electromagnetic Fields (RF-EMF) Levels on Recipient’s Subjective RF-EMF Exposure Levels". En 2023 International Symposium on Electromagnetic Compatibility – EMC Europe. IEEE, 2023. http://dx.doi.org/10.1109/emceurope57790.2023.10274354.

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Mahadi, Wan Nor Liza, Norfizah Md Ali y Quek Pei Wen. "Evaluation of RF EMF exposure pattern on selected communication towers in Malaysia". En 2010 IEEE International Conference on Semiconductor Electronics (ICSE). IEEE, 2010. http://dx.doi.org/10.1109/smelec.2010.5549379.

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Mazloum, Taghrid, Shanshan Wang y Joe Wiart. "RF-EMF exposure induced by distributed antenna system in the subway station". En 2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC). IEEE, 2022. http://dx.doi.org/10.23919/at-ap-rasc54737.2022.9814210.

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Gallucci, Silvia, Marta Bonato, Martina Benini, Emma Chiaramello, Serena Fiocchi, Gabriella Tognola y Marta Parazzini. "Human RF-EMF Exposure Assessment for a Wearable Device by Stochastic Dosimetry". En 2022 Microwave Mediterranean Symposium (MMS). IEEE, 2022. http://dx.doi.org/10.1109/mms55062.2022.9825623.

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Wigren, Torbjorn, Davide Colombi, Bjorn Thors y Jan-Erik Berg. "Implication of RF EMF Exposure Limitations on 5G Data Rates above 6 GHz". En 2015 IEEE 82nd Vehicular Technology Conference (VTC Fall). IEEE, 2015. http://dx.doi.org/10.1109/vtcfall.2015.7390974.

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Andriesei, Cristian y Cristian Turca. "Indirect characterisation of indoor RF EMF exposure to nearby mobile phone base stations". En 2021 International Symposium on Signals, Circuits and Systems (ISSCS). IEEE, 2021. http://dx.doi.org/10.1109/isscs52333.2021.9497368.

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Freudenstein, Frederik, Peter M. Wiedemann, Milica Pejanovic-Djurisic, Mladen Koprivica y Aleksandar Neskovic. "Intuitive exposure and risk perception of RF EMF: Case studies Serbia and Montenegro". En 2014 22nd Telecommunications Forum Telfor (TELFOR). IEEE, 2014. http://dx.doi.org/10.1109/telfor.2014.7034344.

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