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Electromagnetic field

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
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
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
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
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
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
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
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
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
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
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
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
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
Lei Chen, Fan Zhang, Xin-Yu Deng, Xiangxin Xue, Li Wang, Yantao Sun, Jing-Dong Feng, Yongjun Zhang, Yaxin Wang, Young Mee Jung
A plasmon induced carrier movement enhanced mechanism of surface-enhanced Raman scattering (SERS) was investigated using a charge-transfer (CT) enhancement mechanism. Here, we designed a strategy to study SERS in Au@Cu2O nanoshell nanoparticles with different shell thicknesses. Among the plasmonically coupled nanostructures, Au spheres with Cu2O shells have been of special interest due to their ultrastrong electromagnetic fields and controllable carrier transfer properties, which are useful for SERS. Au@Cu2O nanoshell nanoparticles (NPs) with shell thicknesses of 48-56nm are synthesized that exhibit high SERS activity...
September 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Song-Yuan Ding, En-Ming You, Jun Yi, Jian-Feng Li, Zhong-Qun Tian
After surface-enhanced Raman spectroscopy (SERS) was initiated over four decades ago, its practical application seems to be far behind the fundamental research that has made tremendous progress. SERS as a highly sensitive technique has not been widely adopted by the materials science and surface science communities or in the market of analytical instruments. In this discussion, we first classify the previous approaches along this direction over the past four decades and divide them into three strategies. Based on our recent theoretical and experimental approaches, we discuss in more detail the third strategy related to shell-isolated nanostructures...
September 8, 2017: Faraday Discussions
Quanjiang Li, Maodu Chen
Surface-enhanced Raman scattering (SERS) and absorption spectra of the pyridine molecule adsorbed on AumAgn (m+n=6) bimetallic cluster are theoretically investigated by time-dependent density functional theory (TD-DFT). The contributions of static chemical enhancement to the ground-state system are analyzed, and the static Raman intensity of Py-AumAgn complexes are enhanced on the order of 10. A method of visualization on charge transfer is used to distinguish the contributions of charge-transfer (CT) enhancement and electromagnetic enhancement (EM)...
September 8, 2017: Nanotechnology
P Dawson, D Frey, V Kalathingal, R Mehfuz, J Mitra
Quantitative understanding of the electromagnetic component in enhanced Raman spectroscopy is often difficult to achieve on account of the complex substrate structures utilised. We therefore turn to two structurally simple systems amenable to detailed modelling. The first is tip-enhanced Raman scattering under electron scanning tunnelling microscopy control (STM-TERS) where, appealing to understanding developed in the context of photon emission from STM, it is argued that the localised surface plasmon modes driving the Raman enhancement exist in the visible and near-infrared regime only by virtue of significant modification to the optical properties of the tip and sample metals (gold here)...
September 8, 2017: Faraday Discussions
Jianjun Li, Zhaobin Zeng, Yantao Zhao, Da Jing, Chuhua Tang, Yin Ding, Xue Feng
Type 2 diabetic patients have impaired bone quality, leading to increased fracture risk. Substantial evidence demonstrates that pulsed electromagnetic fields (PEMF) could resist osteopenia/osteoporosis induced by estrogen deficiency and disuse. However, the effects of PEMF on osteopenia/osteoporosis associated with diabetes, especially for more prevalent type 2 diabetes, remain poorly understood. We herein investigated the skeletal effects and mechanisms of PEMF (15 Hz, 20 Gs) on leptin receptor-deficient db/db mice with typical type 2 diabetic symptoms...
September 7, 2017: Scientific Reports
The Hong Phong Nguyen, Vy T H Pham, Vladimir Baulin, Rodney J Croft, Russell J Crawford, Elena P Ivanova
The effect of red blood cells (RBC) exposed to an 18 GHz electromagnetic field (EMF) was studied. The results of this study demonstrated for the first time that exposure of RBCs to 18 GHz EMF has the capacity to induce nanospheres uptake in RBCs. The uptake of nanospheres (loading efficiency 96% and 46% for 23.5 and 46.3 nm nanospheres respectively), their presence and locality were confirmed using three independent techniques, namely scanning electron microscopy, confocal laser scanning microscopy and transmission electron microscopy...
September 7, 2017: Scientific Reports
Md Shahadat Hossain Akram, Takayuki Obata, Mikio Suga, Fumihiko Nishikido, Eiji Yoshida, Kazuyuki Saito, Taiga Yamaya
We have been working on the development of a PET insert for existing magnetic resonance imaging (MRI) systems for simultaneous PET/MR imaging, which integrates radiofrequency (RF)-shielded PET detector modules with an RF head coil. In order to avoid interferences between the PET detector circuits and the different MRI-generated electromagnetic fields, PET detector circuits were installed inside eight Cu-shielded fiber-reinforced plastic boxes, and these eight shielded PET modules were integrated in between the eight elements of a 270-mm-diameter and 280-mm-axial-length cylindrical birdcage RF coil, which was designed to be used with a 3-T clinical MRI system...
August 31, 2017: Journal of Magnetic Resonance
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