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Electromagnetic Fields

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https://www.readbyqxmd.com/read/28930547/use-of-non-ionizing-electromagnetic-fields-for-the-treatment-of-cancer
#1
Hugo Jimenez, Carl Blackman, Glenn Lesser, Waldemar Debinski, Michael Chan, Sambad Sharma, Kounosuke Watabe, Hui-Wen Lo, Alexandra Thomas, Dwayne Godwin, William Blackstock, Albert Mudry, James Posey, Rodney O'Connor, Ivan Brezovich, Keith Bonin, Daniel Kim-Shapiro, Alexandre Barbault, Boris Pasche
Cancer treatment and treatment options are quite limited in circumstances such as when the tumor is inoperable, in brain cancers when the drugs cannot penetrate the blood-brain-barrier, or when there is no tumor-specific target for generation of effective therapeutic antibodies. Despite the fact that electromagnetic fields (EMF) in medicine have been used for therapeutic or diagnostic purposes, the use of non-ionizing EMF for cancer treatment is a new emerging concept. Here we summarize the history of EMF from the 1890's to the novel and new innovative methods that target and treat cancer by non-ionizing radiation...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28930311/universal-analytical-modeling-of-plasmonic-nanoparticles
#2
Renwen Yu, Luis M Liz-Marzán, F Javier García de Abajo
Control over the optical response of metal nanoparticles and their associated plasmons is currently enabling many promising applications in areas as diverse as biosensing and photocatalysis. In this context, experiments based upon colloid synthesis and nanofabricated structures are assisted by numerical electromagnetic modeling, which supplies predictive simulations, but not the kind of physical intuition needed for exploration of new ideas, such as one finds when simple mathematical expressions can describe a problem...
September 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28930303/mitigation-measures-of-electromagnetic-field-exposure-in-the-vicinity-of-high-frequency-welders
#3
Bartłomiej Zubrzak, Pawel Bieńkowski, Pawel Cała
BACKGROUND: Presented information about the welding process and equipment, focusing on the emission of electromagnetic field (EMF) with levels significant in terms of the labor safety regulations in force in Poland - the ordinances of the Minister of Family, Labour and Social Policy that came into force on June 27, 2016 and June 29, 2016 - emerged due to harmonization with EU directive 2013/35/EU of 26 June 2013 of the European Parliament and the Council. They presented methods of determination of the EMF distribution in the welding machine surroundings and analyzed the background knowledge from the available literature...
September 20, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/28930099/optical-properties-of-graphene-nanocones-under-electric-and-magnetic-fields
#4
Pable Ulloa, Monica Pacheco, Andrea Latge
Here we present a theoretical study of the optical properties of graphene nanocones tuned by external electric and magnetic fields. We investigate the effects of the size and topology of the carbon nanostructures on the density of states and on the electro- and magneto-absorption of linearly polarized electromagnetic radiation in different nanocone geometries. We find that the electric field induces changes in the electric charge distribution mainly at the cone edges. In the infrared range the absorption coefficient shows a peculiar dependence on the electric field (magnitude and direction) and on the photon polarization for all investigated structures...
September 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28924230/two-step-excitation-in-hot-atomic-sodium-vapor
#5
Bernd Docters, Jörg Wrachtrup, Ilja Gerhardt
A two step excitation scheme in hot atomic sodium vapor is experimentally investigated. The observed effects reflect a coupling between the 3(2)S, 3(2)P and the 3(2)D states. We present the relative dependence on detuning of the two utilized lasers around λ = 589 nm and 819 nm. Unlike expected, we achieve a higher detuning dependence of the probe and the coupling laser by a factor of approximately three. The presented work aimed for a Rydberg excitation and quantum light storage. Such schemes are usually implemented with a red laser on the D-line transition and a coupling laser of shorter (typically blue) wavelength...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28922603/semiconductor-plasmon-induced-upconversion-enhancement-in-mcu2-xs-sio2-y2o3-yb-3-er-3-core-shell-nanocomposites
#6
Donglei Zhou, Dongyu Li, Xiangyu Zhou, Wen Xu, Xu Chen, Dali Liu, Yongsheng Zhu, Hongwei Song
The ability to modulate the intensity of electromagnetic field by semiconductor plasmon nanoparticles is becoming attractive owing to its unique doping induced local surface plasmon resonance (LSPR) effect different from metals. Herein, we synthesized the mCu2-xS@SiO2@Y2O3:Yb(3+),Er(3+) core-shell composites and experimentally and theoretically studied the semiconductor plasmon induced upconversion (UC) enhancement, and obtained 30 folds UC enhancement compared to that of SiO2@Y2O3:Yb(3+),Er(3+) composites...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920892/computationally-efficient-algorithms-for-sparse-dynamic-solutions-to-the-eeg-source-localization-problem
#7
Elvira Pirondini, Behtash Babadi, Gabriel Obregon-Henao, Camilo Lamus, Wasim Q Malik, Matti S Hamalainen, Patrick L Purdon
OBJECTIVE: Electroencephalography (EEG) and magnetoencephalography (MEG) non-invasively record scalp electromagnetic fields generated by cerebral currents, revealing millisecond-level brain dynamics useful for neuroscience and clinical applications. Estimating the currents that generate these fields, i.e., source localization, is an ill-conditioned inverse problem. Solutions to this problem have focused on spatial continuity constraints, dynamic modeling, or sparsity constraints. The combination of these key ideas could offer significant performance improvements, but substantial computational costs pose a challenge for practical application of such approaches...
September 14, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28914756/an-anti-electromagnetic-attack-puf-based-on-a-configurable-ring-oscillator-for-wireless-sensor-networks
#8
Zhaojun Lu, Dongfang Li, Hailong Liu, Mingyang Gong, Zhenglin Liu
Wireless sensor networks (WSNs) are an emerging technology employed in some crucial applications. However, limited resources and physical exposure to attackers make security a challenging issue for a WSN. Ring oscillator-based physical unclonable function (RO PUF) is a potential option to protect the security of sensor nodes because it is able to generate random responses efficiently for a key extraction mechanism, which prevents the non-volatile memory from storing secret keys. In order to deploy RO PUF in a WSN, hardware efficiency, randomness, uniqueness, and reliability should be taken into account...
September 15, 2017: Sensors
https://www.readbyqxmd.com/read/28912976/electromagnetic-interference-from-swimming-pool-generator-current-causing-inappropriate-icd-discharges
#9
Edward Samuel Roberto, Thein Tun Aung, Atif Hassan, Abdul Wase
Electromagnetic interference (EMI) includes any electromagnetic field signal that can be detected by device circuitry, with potentially serious consequences: incorrect sensing, pacing, device mode switching, and defibrillation. This is a unique case of extracardiac EMI by alternating current leakage from a submerged motor used to recycle chlorinated water, resulting in false rhythm detection and inappropriate ICD discharge. A 31-year-old female with arrhythmogenic right ventricular cardiomyopathy and Medtronic dual-chamber ICD placement presented after several inappropriate ICD shocks at the public swimming pool...
2017: Case Reports in Cardiology
https://www.readbyqxmd.com/read/28910505/a-review-on-organic-inorganic-halide-perovskite-photodetectors-device-engineering-and-fundamental-physics
#10
REVIEW
Mahshid Ahmadi, Ting Wu, Bin Hu
The last eight years (2009-2017) have seen an explosive growth of interest in organic-inorganic halide perovskites in the research communities of photovoltaics and light-emitting diodes. In addition, recent advancements have demonstrated that this type of perovskite has a great potential in the technology of light-signal detection with a comparable performance to commercially available crystalline Si and III-V photodetectors. The contemporary growth of state-of-the-art multifunctional perovskites in the field of light-signal detection has benefited from its outstanding intrinsic optoelectronic properties, including photoinduced polarization, high drift mobilities, and effective charge collection, which are excellent for this application...
September 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28902979/core-shell-nanoparticle-clusters-enable-synergistic-integration-of-plasmonic-and-catalytic-functions-in-a-single-platform
#11
Seunghoon Lee, Younghyun Wy, Young Wook Lee, Kyungrok Ham, Sang Woo Han
Designing controlled hybrid nanoarchitectures between plasmonic and catalytic materials is of paramount importance to fully exploit each function of constituent materials. This study reports a new synthetic strategy for the realization of colloidal clusters of core-shell nanoparticles with plasmonic cores and catalytically active shells. The Au@M (M = Pd or Pt) nanoparticle clusters (NPCs) with a high density of sub-1 nm interparticle gaps are successfully prepared by the deposition of M shells onto thermally activated Au NPCs...
September 13, 2017: Small
https://www.readbyqxmd.com/read/28902603/the-utility-of-conservative-treatment-modalities-in-the-management-of-osteonecrosis
#12
Feroz Osmani, Savyasachi Thakkar, Jonathan Vigdorchik
INTRODUCTION: Osteonecrosis is an ischemic pathologic process associated with a number of conditions affecting a range of age groups. The problem faced in the management of osteonecrosis is whether conservative treatment is a viable and effective option for patients. In this systematic review, we investigated the efficacy of various nonoperative treatment modalities for hip and knee osteonecrosis, including pharmacological management and biophysical modalities. METHODS: We identified 16 studies based on electronic searches through the PubMed, Embase, CINAHL Plus, and Cochrane databases from January 2001 to November 2015...
May 2017: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/28901633/response-to-mortazavi-s-comment
#13
Bellieni Carlo Valerio, Giuseppe Buonocore
Mortazavi's comment (1) on our letter (2) on whether electromagnetic fields (EMF) in incubators are a risk factor for autism contains several points that need to be corrected. First, we did not base our observations just on our previous papers as Mortazavi maintains. In fact, our observations were also based on several more papers about EMF in incubators, including the paper by Calvente et al, which was published in 2017 (3). Second, it is incorrect to write that a very simple intervention, such as changing the infants' sleep position, namely the position of the head and feet, can lead to a significant drop, as big as several orders of magnitude, in the infant's brain exposure (1), because in most incubators EMF levels are similar at all points of the mattress...
September 13, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28895970/mechanisms-and-applications-of-terahertz-metamaterial-sensing-a-review
#14
REVIEW
Wendao Xu, Lijuan Xie, Yibin Ying
Terahertz (THz) technology has attracted great worldwide interest and novel high-intensity THz sources and plasmonics are two of the most active fields of recent research. Being situated between infrared light and microwave radiation, the absorption of THz rays in molecular and biomolecular systems is dominated by the excitation of intramolecular and intermolecular vibrations. This indicates that THz technology is an effective tool for sensing applications. However, the low sensitivity of free-space THz detection limits the sensing applications, which gives a great opportunity to metamaterials...
September 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28894271/laser-induced-linear-field-particle-acceleration-in-free-space
#15
Liang Jie Wong, Kyung-Han Hong, Sergio Carbajo, Arya Fallahi, Philippe Piot, Marin Soljačić, John D Joannopoulos, Franz X Kärtner, Ido Kaminer
Linear-field particle acceleration in free space (which is distinct from geometries like the linac that requires components in the vicinity of the particle) has been studied for over 20 years, and its ability to eventually produce high-quality, high energy multi-particle bunches has remained a subject of great interest. Arguments can certainly be made that linear-field particle acceleration in free space is very doubtful given that first-order electron-photon interactions are forbidden in free space. Nevertheless, we chose to develop an accurate and truly predictive theoretical formalism to explore this remote possibility when intense, few-cycle electromagnetic pulses are used in a computational experiment...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28894208/analyzing-intrinsic-plasmonic-chirality-by-tracking-the-interplay-of-electric-and-magnetic-dipole-modes
#16
Li Hu, Yingzhou Huang, Lujun Pan, Yurui Fang
Plasmonic chirality represents significant potential for novel nanooptical devices due to its association with strong chiroptical responses. Previous reports on plasmonic chirality mechanism mainly focus on phase retardation and coupling. In this paper, we propose a model similar to the chiral molecules for explaining the intrinsic plasmonic chirality mechanism of varies 3D chiral structures quantitatively based on the interplay and mixing of electric and magnetic dipole modes (directly from electromagnetic field numerical simulations), which forms mixed electric and magnetic polarizability...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28894134/probing-microwave-fields-and-enabling-in-situ-experiments-in-a-transmission-electron-microscope
#17
F J T Goncalves, G W Paterson, D McGrouther, T Drysdale, Y Togawa, D S Schmool, R L Stamps
A technique is presented whereby the performance of a microwave device is evaluated by mapping local field distributions using Lorentz transmission electron microscopy (L-TEM). We demonstrate the method by measuring the polarisation state of the electromagnetic fields produced by a microstrip waveguide as a function of its gigahertz operating frequency. The forward and backward propagating electromagnetic fields produced by the waveguide, in a specimen-free experiment, exert Lorentz forces on the propagating electron beam...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28892876/effect-of-radiofrequency-radiation-emitted-from-2g-and-3g-cell-phone-on-developing-liver-of-chick-embryo-a-comparative-study
#18
Mary Hydrina D'Silva, Rijied Thompson Swer, J Anbalagan, Bhargavan Rajesh
INTRODUCTION: The increasing scientific evidence of various health hazards on exposure of Radiofrequency Radiation (RFR) emitted from both the cell phones and base stations have caused significant media attention and public discussion in recent years. The mechanism of interaction of RF fields with developing tissues of children and fetuses may be different from that of adults due to their smaller physical size and variation in tissue electromagnetic properties. The present study may provide an insight into the basic mechanisms by which RF fields interact with developing tissues in an embryo...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28890487/quantitative-measurement-of-protein-using-metal-mesh-device
#19
Seiji Kamba, Hirokazu Seto, Takashi Kondo, Yoshiko Miura
Biosensing of protein adsorption with metal mesh device (MMD) was investigated by computational calculations and experiments. Electromagnetic field computation was carried out with a single unit cell of MMD. Equivalent circuit model of MMD on the single unit cell was assumed, and the biosensing with MMD was analyzed in detail by computational calculation and experimental measurements. The dip frequency of MMD was shifted by adsorption of protein on MMD. The shift of dip frequency of MMD was proportional to the amount of protein adsorption...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28888726/complementary-analyses-of-hollow-cylindrical-unioriented-permanent-magnet-hcm-with-high-permeability-external-layer
#20
Carlos M S Lobo, Giancarlo Tosin, Johann E Baader, Luiz A Colnago
In this article, several studies based on analytical expressions and computational simulations on Hollow Cylindrical Magnets with an external soft ferromagnetic material (HCM magnets) are presented. Electromagnetic configurations, as well as permanent-magnet-based structures, are studied in terms of magnetic field strength and homogeneity. Permanent-magnet-based structures are further analyzed in terms of the anisotropy of the magnetic permeability. It was found that the HCM magnets produce a highly homogeneous magnetic field as long as the magnetic material is isotropic...
September 1, 2017: Journal of Magnetic Resonance
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