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Electromagnetic Fields

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https://www.readbyqxmd.com/read/28726671/in-situ-decoration-of-plasmonic-au-nanoparticles-on-graphene-quantum-dots-graphitic-carbon-nitride-hybrid-and-evaluation-of-its-visible-light-photocatalytic-performance
#1
Biswajit Choudhury, Pravat Kumar Giri, Rajender Gone
This work spotlights the development of a plasmonic photocatalyst showing surface plasmon induced enhanced visible light photocatalytic performance. Plasmonic Au nanoparticles (NPs) are decorated over the hybrid nanosystem of graphitic carbon nitride (GCN) and graphene quantum dots (GQD) by citrate reduction method. Surface plasmon resonance (SPR) induced enhancement of Raman G and 2D band intensity is encountered on excitation of the Plasmonic hybrid at 514.5 nm, which is near to the 532 nm absorption band of Au nanoparticles...
July 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28726383/marangoni-convection-assisted-single-molecule-detection-with-nanojet-surface-enhanced-raman-spectroscopy
#2
Te-Wei Chang, Xinhao Wang, Amirreza Mahigir, Georgios Veronis, Gang Logan Liu, Manas Ranjan Gartia
Many single-molecule (SM) label-free techniques such as scanning probe microscopies (SPM) and magnetic force spectroscopies (MFS) provide high resolution surface topography information, but lack chemical information. Typical surface enhanced Raman spectroscopy (SERS) systems provide chemical information on the analytes, but lack spatial resolution. In addition, a challenge in SERS sensors is to bring analytes into the so-called "hot spots" (locations where the enhancement of electromagnetic field amplitude is larger than 10(3))...
July 20, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28725027/strong-coherent-light-amplification-with-double-electromagnetically-induced-transparency-coherences
#3
Dan Wang, Chao Liu, Changshun Xiao, Junxiang Zhang, Hessa M M Alotaibi, Barry C Sanders, Li-Gang Wang, Shiyao Zhu
We experimentally demonstrate coherent amplification of probe field in a tripod-type atoms driven by strong coupling, signal and weak probe fields. We suppress linear and nonlinear atomic absorptions for resonant and near resonant probe via double electromagnetically induced transparency (DEIT). Combining these advantages of suppressed absorption along with temperature- or atomic-density-controlled transfer of population(ToP) between hyperfine ground states, we can induce near-resonant amplification of probe through stimulated Raman scattering(SRS) pumped by low-intensity signal field...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724940/dispersive-2d-cherenkov-radiation-on-a-dielectric-nano-film
#4
Weihao Liu
We report a modified two-dimensional Cherenkov radiation, which occurs on a high-index dielectric nano-film driven by uniformly moving electron-beam. It is essentially different from the ordinary Cherenkov radiation in that, in the nondispersive medium, it shows unique dispersion characteristics-the waves with higher frequencies radiate at larger Cherenkov angles. Its radiation frequency and direction are essentially determined by structure parameters as well as the beam-velocity. By means of fully electromagnetic simulations and theoretical analyses, we explored the mechanism and requirements of this radiation...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723250/application-of-molecular-dynamic-simulation-to-study-food-proteins-a-review
#5
Ashutosh Singh, Sai Kranthi Vanga, Valerie Orsat, Vijaya Raghavan
This review presents an overview of the application of molecular dynamic simulation to study food proteins. Processing of food using thermal, chemical, radiation, electromagnetic and mechanical techniques subject its macromolecular bio-components such as carbohydrates and proteins to extreme heat, ionic strength, pH and mechanical deformation. These processing factors affect protein's functional properties such as emulsification, dough formation, gelation, etc. which are associated with changes in their structure...
July 19, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28723169/nanoantenna-enhanced-infrared-spectroscopic-chemical-imaging
#6
Lucca Kühner, Mario Hentschel, Ute Zschieschang, Hagen Klauk, Jochen Vogt, Christian Huck, Harald Giessen, Frank Neubrech
Spectroscopic infrared chemical imaging is ideally suited for label-free and spatially resolved characterization of molecular species, but often suffers from low infrared absorption cross sections. Here, we overcome this limitation by utilizing confined electromagnetic near-fields of resonantly excited plasmonic nanoantennas, which enhance the molecular absorption by orders of magnitude. In the experiments, we evaporate microstructured chemical patterns of C60 and pentacene with nanometer thickness on top of homogeneous arrays of tailored nanoantennas...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722075/a-new-route-for-the-synthesis-of-a-ag-nanopore-inlay-nanogap-structure-integrated-ag-core-graphene-shell-ag-jacket-nanoparticles-for-high-efficiency-sers-detection
#7
Hengwei Qiu, Minqiang Wang, Zhi Yang, Shouzhen Jiang, Yanjun Liu, Le Li, Minghui Cao, Junjie Li
We present a new route for the synthesis of Ag nanopore-inlay-nanogap structures using creviced graphene-shell encapsulated Cu nanoparticles (Cu@G-NPs) as the sacrificial templates. The as-synthesized integrated Ag-core@graphene-shell@Ag-jacket nanoparticles (AgC@G@AgJ-NPs) presents "chrysanthemum" shapes that contain abundant sub-10 nm size intraparticle nanopores/nanogaps, which can generate huge enhanced electromagnetic fields to support SERS activity, resulting in an average EF > 10(7) due to a high-density of intraparticle and interparticle "hot spots"...
July 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28720908/negative-reflecting-meta-mirrors
#8
Rui Yang, Dong Li, Dongxing Gao, Aofang Zhang, Bowei Hu, Pei Yang, Zhenya Lei, Jiacheng Li
Using the gradient phase discontinuities that meta-mirrors provide, we show that the incident wave can be reflected anomalously with a broad angle range of negative reflections. Such reversed behaviors promote the immediate applications for the planar meta-mirrors to steer the signals more arbitrarily and the convex meta-mirrors to focus and collimate electromagnetic fields. We practically implement these negative reflecting meta-mirrors through an arrangement of subwavelength ring patches and generate the desired phase distribution by also considering the incident angle...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720854/laser-pulse-shape-control-of-seeded-qed-cascades
#9
Matteo Tamburini, Antonino Di Piazza, Christoph H Keitel
QED cascades are complex avalanche processes of hard photon emission and electron-positron pair creation driven by ultrastrong electromagnetic fields. They play a fundamental role in astrophysical environments such as a pulsars' magnetosphere, rendering an earth-based implementation with intense lasers attractive. In the literature, QED cascades were also predicted to limit the attainable intensity in a set-up of colliding laser beams in a tenuous gas such as the residual gas of a vacuum chamber, therefore severely hindering experiments at extreme field intensities...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28713615/effects-of-radiofrequency-exposure-emitted-from-a-gsm-mobile-phone-on-proliferation-differentiation-and-apoptosis-of-neural-stem-cells
#10
Mahsa Eghlidospour, Amir Ghanbari, Seyyed Mohammad Javad Mortazavi, Hassan Azari
Due to the importance of neural stem cells (NSCs) in plasticity of the nervous system and treating neurodegenerative diseases, the main goal of this study was to evaluate the effects of radiofrequency radiation emitted from a GSM 900-MHz mobile phone with different exposure duration on proliferation, differentiation and apoptosis of adult murine NSCs in vitro. We used neurosphere assay to evaluate NSCs proliferation, and immunofluorescence assay of neural cell markers to examine NSCs differentiation. We also employed alamarBlue and caspase 3 apoptosis assays to assess harmful effects of mobile phone on NSCs...
June 2017: Anatomy & Cell Biology
https://www.readbyqxmd.com/read/28711047/global-density-fluctuations-in-methane-clathrate-hydrates-in-externally-applied-electromagnetic-fields
#11
Conor J Waldron, Niall J English
Non-equilibrium molecular-dynamics simulations of bulk methane clathrate hydrates have been conducted in a range of externally applied electromagnetic (e/m) fields. Studies into frequencies of system(or "global")-mass-density fluctuations showed that these clathrates have three major modes: the dominant one is attributable to water molecules' librations and occurs at 720 cm(-1), regardless of any applied e/m fields. One of the more minor system-density fluctuations arises at 10-12 cm(-1) and is caused by the propagation of local-density fluctuations; again, this is independent of e/m fields...
July 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28709211/combustion-instability-mitigation-by-magnetic-fields
#12
Agnes Jocher, Heinz Pitsch, Thomas Gomez, Jérôme Bonnety, Guillaume Legros
The present interdisciplinary study combines electromagnetics and combustion to unveil an original and basic experiment displaying a spontaneous flame instability that is mitigated as the non-premixed sooting flame experiences a magnetic perturbation. This magnetic instability mitigation is reproduced by direct numerical simulations to be further elucidated by a flow stability analysis. A key role in the stabilization process is attributed to the momentum and thermochemistry coupling that the magnetic force, acting mainly on paramagnetic oxygen, contributes to sustain...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28708840/index-extraction-for-electromagnetic-field-evaluation-of-high-power-wireless-charging-system
#13
SangWook Park
This paper presents the precise dosimetry for highly resonant wireless power transfer (HR-WPT) system using an anatomically realistic human voxel model. The dosimetry for the HR-WPT system designed to operate at 13.56 MHz frequency, which one of the ISM band frequency band, is conducted in the various distances between the human model and the system, and in the condition of alignment and misalignment between transmitting and receiving circuits. The specific absorption rates in the human body are computed by the two-step approach; in the first step, the field generated by the HR-WPT system is calculated and in the second step the specific absorption rates are computed with the scattered field finite-difference time-domain method regarding the fields obtained in the first step as the incident fields...
2017: PloS One
https://www.readbyqxmd.com/read/28707905/unifying-microscopic-and-continuum-treatments-of-van-der-waals-and-casimir-interactions
#14
Prashanth S Venkataram, Jan Hermann, Alexandre Tkatchenko, Alejandro W Rodriguez
We present an approach for computing long-range van der Waals (vdW) interactions between complex molecular systems and arbitrarily shaped macroscopic bodies, melding atomistic treatments of electronic fluctuations based on density functional theory in the former with continuum descriptions of strongly shape-dependent electromagnetic fields in the latter, thus capturing many-body and multiple scattering effects to all orders. Such a theory is especially important when considering vdW interactions at mesoscopic scales, i...
June 30, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28707669/-planar-molecular-arrangements-aid-the-design-of-mhc-class-ii-binding-peptides
#15
A Cortés, J Coral, C McLachlan, R Benítez, L Pinilla
The coupling between peptides and MHC-II proteins in the human immune system is not well understood. This work presents an evidence-based hypothesis of a guiding intermolecular force present in every human MHC-II protein (HLA-II). Previously, we examined the spatial positions of the fully conserved residues in all HLA-II protein types. In each one, constant planar patterns were revealed. These molecular planes comprise of amino acid groups of the same chemical species (for example, Gly) distributed across the protein structure...
May 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28706290/dramatically-enhanced-spin-dynamo-with-plasmonic-diabolo-cavity
#16
Peng Gou, Jie Qian, Fuchun Xi, Yuexin Zou, Jun Cao, Haochi Yu, Ziyi Zhao, Le Yang, Jie Xu, Hengliang Wang, Lijian Zhang, Zhenghua An
The applications of spin dynamos, which could potentially power complex nanoscopic devices, have so far been limited owing to their extremely low energy conversion efficiencies. Here, we present a unique plasmonic diabolo cavity (PDC) that dramatically improves the spin rectification signal (enhancement of more than three orders of magnitude) under microwave excitation; further, it enables an energy conversion efficiency of up to ~0.69 mV/mW, compared with ~0.27 μV/mW without a PDC. This remarkable improvement arises from the simultaneous enhancement of the microwave electric field (~13-fold) and the magnetic field (~195-fold), which cooperate in the spin precession process generates photovoltage (PV) efficiently under ferromagnetic resonance (FMR) conditions...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28706244/predicting-magnetostimulation-thresholds-in-the-peripheral-nervous-system-using-realistic-body-models
#17
Mathias Davids, Bastien Guérin, Matthias Malzacher, Lothar R Schad, Lawrence L Wald
Rapid switching of applied magnetic fields in the kilohertz frequency range in the human body induces electric fields powerful enough to cause Peripheral Nerve Stimulation (PNS). PNS has become one of the main constraints on the use of high gradient fields for fast imaging with the latest MRI gradient technology. In recent MRI gradients, the applied fields are powerful enough that PNS limits their application in fast imaging sequences like echo-planar imaging. Application of Magnetic Particle Imaging (MPI) to humans is similarly PNS constrained...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28704941/effect-of-uv-c-radiation-ultra-sonication-electromagnetic-field-and-microwaves-on-changes-in-polyphenolic-compounds-in-chokeberry-aronia-melanocarpa
#18
Tomasz Cebulak, Jan Oszmiański, Ireneusz Kapusta, Sabina Lachowicz
Chokeberry fruits are highly valued for their high content of polyphenolic compounds. The use of such abiotic stress factors as UV-C radiation, an electromagnetic field, microwave radiation, and ultrasound, at different operation times, caused differentiation in the contents of anthocyanins, phenolic acids, flavonols, and flavan-3-ols. Samples were analyzed for contents of polyphenolics with ultra-performance liquid chromatography and photodiode detector-quadrupole/time-of-flight mass spectrometry (UPLC-PDA-MS/MS)...
July 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28704784/quantitative-detection-of-glucose-level-based-on-radiofrequency-patch-biosensor-combined-with-volume-fixed-structures
#19
Tian Qiang, Cong Wang, Nam-Young Kim
A concept for characterizing a radiofrequency (RF) patch biosensor combined with volume-fixed structures is presented for timely monitoring of an individual's glucose levels based on frequency variation. Two types of patch biosensors-separately integrated with a backside slot (0.53μL) and a front-side tank (0.70μL) structure-were developed to achieve precise and efficient detection while excluding the effects of interference due to the liquidity, shape, and thickness of the tested glucose sample. A glucose test analyte at different concentrations (50-600mg/dL) was dropped into the volume-fixed structures...
June 28, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28702986/electromagnetic-field-in-control-tissue-regeneration-pelvic-pain-neuro-inflammation-and-modulation-of-non-neuronal-cells
#20
S E Aragona, G Mereghetti, G Gianazza, A Salsa, G Gianazza, J Lotti, A Vosa, T Lotti, E Canavesi
In scientific literature, magnetic fields are used both in basic science and clinical research. They are often used to treat pain and neuro-inflammation disorders thanks to their influence on cellular responses. Our project was born from the regenerative support that we wanted to give to those diseases characterized by neuro-inflammation, nerve lesion, muscles and tissues disorders that can transform the symptom (e.g. neuropathic pelvic pain) in disease. In this study, we examined the action of pulsed electromagnetic fields (PEMFs) on skin lesion regeneration and the repetitive trans-pelvic magnetic stimulation (rTPMS) on patients affected by incontinence and post-surgical problems, sexual dysfunction, and pelvic pain...
July 13, 2017: Journal of Biological Regulators and Homeostatic Agents
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