A typical cochlear implant system under magnetic resonance imaging (MRI) procedures may couple with the radio frequency (RF) electromagnetic field (EMF) and results in an intensified electric at lead tip. As a result, RF energy deposited human tissues around tip induce heating cause tissue damage concerns. The purpose of this work is to evaluate RF-EMF-induced for 1.5 T MRI coil highlight factors that have significant effects on heating. potential involved including type, trajectory, model...

Purpose This paper investigates the RF‐induced heating for multiple adjacent orthopedic implants under MRI at 1.5T and 3T exposure. When are closely spaced to each other, interactions between may affect heating. Traditional labeling is often only applicable configurations of an individual implant, not multi‐implant configurations. Therefore, aim this study evaluate effects on propose potential appropriate instructions safe scanning multi‐implantable implants. Methods Typical plate nail were...

This study investigated the radiofrequency-induced heating due to interventional catheters at 1,5 T magnetic resonance image (MRI) based on a combined modeling and experimental method. Two types of catheters, "single wire" "dual catheter, were studied. They modeled inside high-resolution anatomical human model along four trajectories. In total, 4 insertion depths, from 17.5 70 cm, 13 scanning landmarks studied cover various clinically relevant scenarios. The computational for was transfer...

Purpose To develop the equivalent medium theorem that can be used to perform accurate evaluation of implantable device safety under MRI exposure. Methods Numerical methods were determine parameters along clinically relevant trajectories inside a human body model. Additionally, numerical and experimental investigations performed using both computational model an inhomogeneous phantom demonstrate effectiveness method. Results The parameters, which are determined from simplified lead...

In this paper, a full-wave simulation-based method is proposed to determine the optimal tissue-simulating medium for magnetic resonance imaging radio-frequency safety assessment patients with active implantable medical devices (AIMDs). Compared standard medium, optimized each AIMD lead path in human bodies. The reciprocity-based transfer function model used as criterion optimizing parameters. Numerical investigations and validations are performed neurostimulator demonstrate method.

NiCr/NiSi functional thin films of temperature measurement cutter sensor were prepared by means advanced Twinned microwave ECR plasma source enhanced Radio Frequency (RF) reaction non-balance magnetron sputtering technique. Fabrication technologies studied. The Compositions, micro-morphology, general structure and depth analyzed Electron Probe, SEM, AFM, step profiler stereo vision micro operation system. results showed that thin-films small depth, uniform compact, smooth good continuity,...

Radio frequency (RF) shimming is a widely used method to improve the MRI quality by adjusting magnitude and phase of transmit elements in RF coil eliminating field inhomogeneity 3T system. This process alters distribution inside borehole changes both level location absorbed energy patients. It necessary assess impact on risk RF-induced heating for patients especially those who have implantable longitude medical electrodes place during procedure. paper investigates impacts generic pacemaker...

Transfer function method was utilized to evaluate the RF-induced heating of implantable lead with 137 implanted trajectories under different shimming conditions. A coated wire is used emulate medical leads. Two conditions were studied. One optimize homogeneity B_(1+) field magnitude in human heart region, and second one estimate possible worst-case RF induced heating. All results are normalized 2W/kg average whole body specific absorption rate (SAR) Q-Matrices formalism improve SAR...

Numerical studies of local specific absorption rate (SAR) were conducted for femoral plate implants in MRI 3T birdcage coil. Both the quadrature excitation and RF shimming conditions evaluated anatomical models human body. All results normalized to 2W/kg average whole body SAR Q-Matrices formalism method was used improve calculation efficiency. The procedure homogenize magnitude B <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1+</sub> field...

One of the critical MRI safety concerns for patients with medical implants is RF coil induced heating in vicinity electrode lead tip. Many works have been carried out to assess such risk fully implanted leads. However studies on partially implanted, as well minimally electrodes not explored. In addition, effects statures, weight, ages and many other factors may vary dramatically. this paper leads are studied both adult male boy models demonstrate variations due pathway types human bodies.

In this work, a corona discharge system with array electrode was built for the rapid sterilization of resistant pathogen (Acinetobacter baumannii). The electrical parameters, pattern, ozone generation, and optic emission spectra were used to characterize plasma. current power positive larger than those negative at same applied voltage. G-value generation about 7.31 times that corona, suggesting has higher energy efficiency. {A}. baumannii efficiency plasma much using (at concentration...

Temperature plays a vital role in the machining industry today. A Nickel-Chrome versus Nickel-Silicon thin-film thermocouple system has been established for measuring instantaneous workpiece temperature chemical explosive material machining. The NiCr/NiSi thermocouples have deposited inside high speed steel cutters by magnetron sputtering. typical deposition conditions are summarized. Static and dynamic calibrations of presented. Seebeck coefficient TFTC is 40.4 μV/°C which almost same as...

Quality characteristics of steel workpiece and their inspection methods are introduced, the influencing factors surface quality analyzed by tools. A set scheme for cutting temperature force on-line monitoring is worked out. Thin film thermocouple technology was introduced to measure dynamic which affects workpieces. system measuring has been developed. high speed data acquisition card ADlink PCI-9118HG used acquire signals. Simple friendly human-machine interface programmed with application...

Coal mines safety condition decides the economic of regional development on one hand, more importantly employees working for other. This article has introduced a scientific system to evaluate level coal mine based AHP so as give out significant information managers make and implement corresponding polices concerning production promote efficiency mines.

Femtosecond laser machining offers high precision and minimal thermal impact, making it a promising technique for processing hard brittle materials like single-crystal diamonds (SCDs). In this study, the femtosecond process SCD material was systematically optimized to improve both efficiency quality. Initial single-factor experiments were conducted explore effects of key parameters—laser power, scanning speed, number scans—on performance. Subsequently, response surface methodology...

Temperature plays a vital role in the machining industry today. NiCr/NiSi thin-film thermocouples have been deposited on rake face of polycrystalline cubic boron nitride (PCBN) tools by magnetron sputtering. The typical deposition conditions are summarized. Static and dynamic calibrations presented. Seebeck coefficient TFTC is 37.3 μV/°C. response time about 3.9 ms. testing results indicate that developed thermocouple sensors perform excellently when A3 steel situ.

By the method of orthogonal experiment, with different sputtering power, pressure, time and substrate bias, 9 NiCr-NiSi thin-film thermocouples properties were prepared on rake face cutting tools. With WS-2005 coating adhesion automatic scratch tester, between tools tested, test results was analyzed by range analysis. Analysis show that, among four factors, bias is most important factor which influenced adhesion. In a certain range, increasing negative voltage value can enhance thin-film....

This article starts with the relationship between of internal control and operational risk, then narrating " risk events X, Y commercial banks in Harbin last three years situation, described two branches detail, focusing on analyzing causes from perspective .through point to area, reflecting common problems explore a good policy prevent resolve bank China control, ultimately establish management system manage Chinese banks, effectively reducing occur frequently China.

In the strategic context of enterprise information technology, a reasonable and scientific assessment value-added has become key issue development. Taking cooperative effect as core, implementation changes value system to certain extent. From perspective chain, information-based business-to-business mainly lies in impact which come from chain nodes, such as, itself, suppliers, customers, competitors, service provider, thus bring value-added. As result, based on theory, this paper proposes...

RF-induced heating of ablation catheters under 1.5T magnetic resonance image (MRI) is studied using combined computational modeling and bench testing. The transfer function are measured experimentally without simplification. A high-resolution anatomical human model was then used to simulate clinical MRI RF exposure environment. upper limit the temperature rise calculated around two types catheters, namely a single wire catheter twin catheter. Four different insertion depths between 17.5 cm...

Unmanned aerial vehicles (UAVs) are becoming increasingly prevalent in wireless communications scheme with theirs inherent advantages of convenience, low cost and flexibility. However, due to the maneuverability UAVs, decoding sequence changes frequently, which generates difficulty accomplishing method joint optimization UAVs track transmitting energy non-orthogonal multiple access (NOMA) assisted communication scheme. Therefore, based on aggregate constraint maximum speed UAV flight, we...

The SME has a significant role in the development of China's national economy, and "cluster" is an important feature SMEs' existence. At present Small business groups' study focuses on geographical space, network space for existing new enterprises less. This article from sense, re-defines concept small groups, compares to enterprise clusters discusses significance group their based