keyword
MENU ▼
Read by QxMD icon Read
search

Electromagnetic Fields

keyword
https://www.readbyqxmd.com/read/28817573/network-representations-of-angular-regions-for-electromagnetic-scattering
#1
Vito G Daniele, Guido Lombardi, Rodolfo S Zich
Network modeling in electromagnetics is an effective technique in treating scattering problems by canonical and complex structures. Geometries constituted of angular regions (wedges) together with planar layers can now be approached with the Generalized Wiener-Hopf Technique supported by network representation in spectral domain. Even if the network representations in spectral planes are of great importance by themselves, the aim of this paper is to present a theoretical base and a general procedure for the formulation of complex scattering problems using network representation for the Generalized Wiener Hopf Technique starting basically from the wave equation...
2017: PloS One
https://www.readbyqxmd.com/read/28815594/differential-effects-of-changes-in-spectral-irradiance-on-photoacclimation-primary-productivity-and-growth-in-rhodomonas-salina-cryptophyceae-and-skeletonema-costatum-bacillariophyceae-in-simulated-blackwater-environments
#2
Evelyn Lawrenz, Tammi L Richardson
The underwater light field in blackwater environments is strongly skewed towards the red end of the electromagnetic spectrum due to blue light absorption by colored dissolved organic matter (CDOM). Exposure of phytoplankton to full spectrum irradiance occurs only when cells are mixed up to the surface. We studied the potential effects of mixing-induced changes in spectral irradiance on photoacclimation, primary productivity and growth in cultures of the cryptophyte Rhodomonas salina and the diatom Skeletonema costatum...
August 16, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28811551/nano-metamaterials-for-ultrasensitive-terahertz-biosensing
#3
Dong-Kyu Lee, Ji-Hun Kang, Junghoon Kwon, Jun-Seok Lee, Seok Lee, Deok Ha Woo, Jae Hun Kim, Chang-Seon Song, Q-Han Park, Minah Seo
As a candidate for a rapid detection of biomaterials, terahertz (THz) spectroscopy system can be considered with some advantage in non-destructive, label-free, and non-contact manner. Because protein-ligand binding energy is in the THz range, especially, most important conformational information in molecular interactions can be captured by THz electromagnetic wave. Based on the THz time-domain spectroscopy system, THz nano-metamaterial sensing chips were prepared for great enhancing of detection sensitivity...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808279/fine-tuning-and-mond-in-a-metamaterial-multiverse
#4
Igor I Smolyaninov, Vera N Smolyaninova
We consider the recently suggested model of a multiverse based on a ferrofluid. When the ferrofluid is subjected to a modest external magnetic field, the nanoparticles inside the ferrofluid form small hyperbolic metamaterial domains, which from the electromagnetic standpoint behave as individual "Minkowski universes" exhibiting different "laws of physics", such as different strength of effective gravity, different versions of modified Newtonian dynamics (MOND) and different radiation lifetimes. When the ferrofluid "multiverse" is populated with atomic or molecular species, and these species are excited using an external laser source, the radiation lifetimes of atoms and molecules in these "universes" depend strongly on the individual physical properties of each "universe" via the Purcell effect...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28806939/effect-of-electromagnetic-fields-on-human-osteoarthritic-and-non-osteoarthritic-chondrocytes
#5
Julia Isabelle Redeker, Bärbel Schmitt, Nele Pascale Grigull, Christian Braun, Andreas Büttner, Volkmar Jansson, Susanne Mayer-Wagner
BACKGROUND: Studies of the effects of electromagnetic fields (EMFs) on cartilaginous cells show a broad range of outcomes. However EMFs are not yet clinically applied as standard treatment of osteoarthritis, as EMF effects are showing varying outcomes in the literature. The aim of this study was to examine effects of EMFs (5 mT or 8 mT) on osteoarthritic (OA) and non-OA chondrocytes in order to investigate whether EMF effects are related to chondrocyte and EMF quality. METHODS: Pellets of human OA and non-OA chondrocytes were exposed to a sinusoidal 15 Hz EMF produced by a solenoid...
August 14, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28806768/design-and-fabrication-of-a-realistic-anthropomorphic-heterogeneous-head-phantom-for-mr-purposes
#6
Sossena Wood, Narayanan Krishnamurthy, Tales Santini, Shailesh Raval, Nadim Farhat, John Andy Holmes, Tamer S Ibrahim
OBJECTIVE: The purpose of this study is to design an anthropomorphic heterogeneous head phantom that can be used for MRI and other electromagnetic applications. MATERIALS AND METHODS: An eight compartment, physical anthropomorphic head phantom was developed from a 3T MRI dataset of a healthy male. The designed phantom was successfully built and preliminarily evaluated through an application that involves electromagnetic-tissue interactions: MRI (due to it being an available resource)...
2017: PloS One
https://www.readbyqxmd.com/read/28805193/optics-of-plasmon-exciton-nanomaterials
#7
Maxim Sukharev, Abraham Nitzan
This review provides a brief introduction to the physics of coupled exciton-plasmon systems, the theoretical description and experimental manifestation of such phenomena, followed by an account of the state-of-the-art methodology for the numerical simulations of such phenomena and supplemented by a number of FORTRAN codes, by which the interested reader can introduce himself/herself to the practice of such simulations. Applications to CW light scattering as well as transient response and relaxation are described...
August 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28803481/autonomous-collision-free-navigation-of-microvehicles-in-complex-and-dynamically-changing-environments
#8
Tianlong Li, Xiaocong Chang, Zhiguang Wu, Jinxing Li, Guangbin Shao, Xinghong Deng, Jianbin Qiu, Bin Guo, Guangyu Zhang, Qiang He, Longqiu Li, Joseph Wang
Self-propelled micro- and nanoscale robots represent a rapidly emerging and fascinating robotics research area. However, designing autonomous and adaptive control systems for operating micro-/nanorobotics in complex and dynamically-changing environments, which is a highly demanding feature, is still an unmet challenge. Here we describe a smart microvehicle for precise autonomous navigation in complicated environments and traffic scenarios. The fully autonomous navigation system of the smart microvehicle is composed of a microscope-coupled CCD camera, an artificial intelligence planner, and a magnetic field generator...
August 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28802550/mr-coagulation-a-novel-minimally-invasive-approach-to-aneurysm-repair
#9
Ouri Cohen, Ming Zhao, Erez Nevo, Jerome L Ackerman
PURPOSE: To demonstrate a proof of concept of magnetic resonance (MR) coagulation, in which MR imaging scanner-induced radiofrequency (RF) heating at the end of an intracatheter long wire heats and coagulates a protein solution to effect a vascular repair by embolization. MATERIALS AND METHODS: MR coagulation was simulated by finite-element modeling of electromagnetic fields and specific absorption rate (SAR) in a phantom. A glass phantom consisting of a spherical cavity joined to the side of a tube was incorporated into a flow system to simulate an aneurysm and flowing blood with velocities of 0-1...
August 9, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28801909/promoter-activation-with-electromagnetism
#10
Abraham O Rodríguez-De la Fuente, J Antonio Heredia-Rojas, Juan M Alcocer-González, Laura E Rodríguez-Flores, Cristina Rodríguez-Padilla, Reyes S Taméz-Guerra
Gene expression can be modified by physical factors, such as heat, electricity and magnetic fields , and several types of ionizing and non-ionizing radiation. Promoter activation with extremely low-frequency electromagnetic fields is possible with an appropriate promoter, containing electromagnetic field response elements. Here, we describe how to examine promoter activation with extremely low-frequency electromagnetic fields, and we provide a step-by-step guide to the assembly of a solenoid suitable for promoter activation...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28799814/electromagnetic-interference-of-dental-equipment-with-implantable-cardioverter-defibrillators
#11
Manoela Teixeira de Sant'Anna Dadalti, Antônio José Ledo Alves da Cunha, Marcos César Pimenta de Araújo, Luis Gustavo Belo de Moraes, Patrícia de Andrade Risso
OBJECTIVE: Implantable cardioverter defibrillators (ICDs) are subject to electromagnetic interference (EMI). The aim of this study was to assess both the EMI of dental equipments with ICDs and related factors. MATERIALS AND METHODS: High- and low-speed handpieces, an electric toothbrush, an implant motor and two types of ultrasonic devices were tested next to an ICD with different sensitivity settings. The ICD was immersed in a saline solution with electrical resistance of 400-800 ohms to simulate the resistance of the human body...
August 11, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28799651/thermal-mapping-on-male-genital-and-skin-tissues-of-laptop-thermal-sources-and-electromagnetic-interaction
#12
Mahdi Safari, Navid Mosleminiya, Ali Abdolali
Since the development of communication devices and expansion of their applications, there have been concerns about their harmful health effects. The main aim of this study was to investigate laptop thermal effects caused by exposure to electromagnetic fields and thermal sources simultaneously; propose a nondestructive, replicable process that is less expensive than clinical measurements; and to study the effects of positioning any new device near the human body in steady state conditions to ensure safety by U...
August 11, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28798837/automated-modification-and-fusion-of-voxel-models-to-construct-body-phantoms-with-heterogeneous-breast-tissue-application-to-mri-simulations
#13
Joseph V Rispoli, Steven M Wright, Craig R Malloy, Mary P McDougall
BACKGROUND: Human voxel models incorporating detailed anatomical features are vital tools for the computational evaluation of electromagnetic (EM) fields within the body. Besides whole-body human voxel models, phantoms representing smaller heterogeneous anatomical features are often employed; for example, localized breast voxel models incorporating fatty and fibroglandular tissues have been developed for a variety of EM applications including mammography simulation and dosimetry, magnetic resonance imaging (MRI), and ultra-wideband microwave imaging...
2017: Journal of Biomedical Graphics and Computing
https://www.readbyqxmd.com/read/28792448/auxiliary-sensor-based-borehole-transient-electromagnetic-system-for-the-nondestructive-inspection-of-multipipe-strings
#14
Bo Dang, Ling Yang, Na Du, Changzan Liu, Ruirong Dang, Bin Wang, Yan Xie
Transient electromagnetic (TEM) techniques are widely used in the field of geophysical prospecting. In borehole detection, the nondestructive inspection (NDI) of a metal pipe can be performed efficiently using the properties of eddy currents. However, with increasing concern for safety in oil and gas production, more than one string of pipe is used to protect wellbores, which complicates data interpretation. In this paper, an auxiliary sensor-based borehole TEM system for the NDI of multipipe strings is presented...
August 9, 2017: Sensors
https://www.readbyqxmd.com/read/28789808/visible-light-driven-n-tio2-sio2-fe3o4-magnetic-nanophotocatalysts-synthesis-characterization-and-photocatalytic-degradation-of-ppcps
#15
Ashutosh Kumar, Musharib Khan, Liping Fang, Irene M C Lo
TiO2-based photocatalysis offers certain advantages like rapid degradation and mineralization of organic compounds. However, the practical applicability of photocatalysts in degradation of pharmaceuticals and personal care products (PPCPs) is still restricted by challenges including their limited photocatalytic activity under visible light and difficulty in their separation from suspension. To overcome these challenges, a visible-light-driven magnetic N-TiO2@SiO2@Fe3O4 nanophotocatalyst was developed through fine-tuning the pertinent factors (calcination temperature, Fe3O4 loading, and nitrogen doping) involved during synthesis process, on the basis of degradation of ibuprofen (a typical PPCP)...
July 24, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28782873/stable-morphological-physiological-and-neural-protein-expression-changes-in-rat-bone-marrow-mesenchymal-stem-cells-treated-with-electromagnetic-field-and-nitric-oxide
#16
Nazanin Haghighat, Parviz Abdolmaleki, Mehrdad Behmanesh, Mohammad Satari
As an external physical factor, electromagnetic field (EMF) may influence cellular processes and nitric oxide (NO) by serving as a secondary messenger molecule in intracellular signaling cascades. Effects of these factors were evaluated simultaneously on viability, morphology, and variation of calcium ion content, and neural protein marker expression in rat bone marrow mesenchymal stem cells (BMSCs). The mesenchymal stem cells were isolated from rat bone marrow and cultured. Deta-NO as a donor molecule of NO was added to cell culture medium after several passages...
August 7, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28782562/mirna-expression-profile-is-altered-differentially-in-the-rat-brain-compared-to-blood-after-experimental-exposure-to-50%C3%A2-hz-and-1%C3%A2-mt-electromagnetic-field
#17
REVIEW
Mehmet Emin Erdal, Senay Görücü Yılmaz, Serkan Gürgül, Coşar Uzun, Didem Derici, Nurten Erdal
Common complex diseases are a result of host and environment interactions. One such putative environmental factor is the electromagnetic field exposure, especially the occupational extremely low frequency (ELF) magnetic field, 50 Hz, 1 mT, whose neurobiological relevance remains elusive. We evaluated the effects of long-term (60 days) ELF-MF exposure on miRNAs previously related to brain and human diseases (miR-26b-5p, miR-9-5p, miR-29a-3p, miR-106b-5p, miR-107, miR-125a-3p). A total of 64 young (3 weeks-old) and mature (10 weeks-old) male/female Wistar-Albino rats were divided into sham and ELF-MF exposed groups...
August 3, 2017: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/28780472/different-profiles-of-the-mrna-levels-of-dna-repair-genes-in-mcf-7-and-sh-sy5y-cells-after-treatment-with-combination-of-cisplatin-50-hz-electromagnetic-field-and-bleomycin
#18
Fatemeh Sanie-Jahromi, Mostafa Saadat
Neurotoxicity is known to be a major dose-limiting adverse effect of cisplatin (CDDP), alone or in combination with other chemicals. DNA repair capacity serve as a neuroprotective factor against CDDP. The purpose of this study was to evaluate the effect of 50-Hz electromagnetic field (EMF) in combination with CDDP and bleomycin (Bleo) on expression of some of DNA repair genes (GADD45A, XRCC1, XRCC4, Ku70, Ku80, DNA-PKcs and LIG4) in MCF-7 (breast cancer) and SH-SY5Y (neuroblastoma) cell lines. MCF-7 and SH-SY5Y cells were pre-treated with CDDP in the presence or absence of EMF and then exposed to different concentration of Bleo...
August 3, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28780141/quantitative-electric-field-mapping-in-thin-specimens-using-a-segmented-detector-revisiting-the-transfer-function-for-differential-phase-contrast
#19
Takehito Seki, Gabriel Sánchez-Santolino, Ryo Ishikawa, Scott D Findlay, Yuichi Ikuhara, Naoya Shibata
Differential phase contrast in scanning transmission electron microscopy can visualize local electromagnetic fields inside specimens. The contrast derived from first moments, the so-called center of mass, of the diffraction patterns for each probe position can be quantitatively related to the local electromagnetic field under the phase object approximation. While only approximate first moments can be obtained with a segmented detector, in weak phase objects the fields can be accurately quantified on the basis of a phase contrast transfer function...
July 26, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28774153/properties-of-longitudinal-electromagnetic-oscillations-in-metals-and-their-excitation-at-planar-and-spherical-surfaces
#20
Vitaly V Datsyuk, Oleg R Pavlyniuk
The common definition of the spatially dispersive permittivity is revised. The response of the degenerate electron gas on an electric field satisfying the vector Helmholtz equation is found with a solution to the Boltzmann equation. The calculated longitudinal dielectric function coincides with that obtained by Klimontovich and Silin in 1952 and Lindhard in 1954. However, it depends on the square of the wavenumber, a parameter of the vector Helmholtz equation, but not the wave vector of a plane electromagnetic wave...
December 2017: Nanoscale Research Letters
keyword
keyword
45989
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"