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High total joule heat increases the risk of post-endoscopic submucosal dissection electrocoagulation syndrome after colorectal endoscopic submucosal dissection

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World Journal of Gastroenterology 2021年第38期27卷 6442-6452页

作者： Masanori Ochi Ryosuke Kawagoe Toshiro Kamoshida Yukako Hamano Haruka Ohkawara Atsushi Ohkawara Nobushige Kakinoki Yuji Yamaguchi Shinji Hirai Akinori Yanaka Kiichiro Tsuchiya Department of Gastroenterology Hitachi General HospitalHitachi City 317-0077IbarakiJapan Department of Gastroenterology Faculty of MedicineUniversity of TsukubaTsukuba 305-8576IbarakiJapan

BACKGROUND We hypothesized that thermal damage accumulation during endoscopic submucosal dissection(ESD)causes the pathogenesis of post-ESD electrocoagulation syndrome(PECS).AIM To determine the association between joule heat and the onset of *** We performed a retrospective cohort study in patients who underwent colorectal ESD from May 2013 to March 2021 in *** developed a novel device that measures swift coagulation time with a sensor adjacent to the electrosurgical coagulation unit foot switch,which enabled us to calculate total joule *** was defined as localized abdominal pain(visual analogue scale≥30 mm during hospitalization or increased by≥20 mm from the baseline)and fever(temperature≥37.5 degrees or white blood cell count≥10000μ/L).Patients exposed to more or less than the median joule heat value were assigned to the high and low joule heat groups,*** analyses included Mann-Whitney U and chisquare tests and logistic regression and receiver operating characteristic curve(ROC)*** We evaluated 151 *** PECS incidence was 10.6%(16/151 cases),and all patients were followed conservatively and discharged without severe *** multivariate analysis,high joule heat was an independent PECS risk *** area under the ROC curve showing the correlation between PECS and total joule heat was high[0.788(95%confidence interval:0.666-0.909)].CONCLUSION joule heat accumulation in the gastrointestinal wall is involved in the onset of ***-related thermal damage to the peeled mucosal surface is probably a major component of the mechanism underlying PECS.

关键词： Post-endoscopic submucosal dissection electrocoagulation syndrome joule heat Colorectal endoscopic submucosal dissection Colorectal neoplasms Electrocoagulation Gastrointestinal tract

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Effect of channel diameter on magneto-thermal conversion ratio and consistency of each strand in a multi-strand induction heating tundish

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Journal of Iron and Steel Research International 2023年第6期30卷 1199-1210页

作者： Pu Wang Hong Xiao Xi-qing Chen Hai-yan Tang Jia-quan Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Magnetoelectric Research Institute Hunan Zhongke Electric Co.Ltd.Yueyang 414000HunanChina

The electromagnetic,flow,heat transfer and inclusions motion model of the channel-type induction heating(IH)tundish was established,and the effect of the channel diameter on the metallurgical behavior of the tundish was *** results show that the magnetic field in the channel of the IH tundish tends to concentrate on the surface layer and the side near the *** the channel diameter is increased from 100 to 180 mm,the maximum value of magnetic flux density in the channel decreases by 0.125 T,and the maximum value of electromagnetic force decreases by 11.83×10^(5) N m^(-3);however,the off-center distance of magnetic field increases by 9.4 mm,and the joule heat in the channel decreases by 1004 kW,which leads to the reduction in temperature rising rate of the tundish from 1.41 to 0.59 K min^(-1).When the channel diameter is 100,140 and 180 mm,the maximum velocity at the channel exit before heating is 0.59,0.29 and 0.18 m s^(-1),and after heating for 1800 s,it is 1.52,1.12 and 0.92 m s^(-1),*** addition,the total inclusions escape ratio after heating for 1800 s with a channel diameter of 140 mm can be reduced by 12.39% compared to that before heating,and the maximum difference of escape ratios for each strand is only 4.51% and 5.32% before heating and after heating for 1800 s,*** with the channel diameters of 100 and 180 mm,the channel diameter of 140 mm is more favorable to improve the metallurgical effect of the IH tundish.

关键词： Induction heating tundish Channel diameter joule heat Temperature rising rate Inclusion escape ratio

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Temperature distribution and effect of low-density electric current on B2+O lamellar microstructure of Ti_2AlNb alloy sheet during resistance heating

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Journal of Central South University 2019年第3期26卷 550-559页

作者： WANG Guo-feng LI Xiao LI Dan-feng GU Yi-bin FANG Hui National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology

The resistance heating method has been one of the prospective techniques for hot processing and welding techniques. The thermal behavior under different densities of electric current and the effect of electric current at temperature of 780 oC using low density of electric current of 6.70 A/mm^2 on the B2+O lamellar microstructure were investigated for Ti2AlNb alloy sheet. The stable temperature denoted a balanced state between the joule heat and the dissipation of heat including heat conduction, convection and radiation while the distribution of temperature was nonuniform. The highest temperatures of electric current heating samples increased as the density of electric current was elevated. In order to understand the specific effect of electric current on B2+O microstructure, heat treatment for microstructural homogeneity was introduced to this study. After that, according to the microstructural observations by common characterization techniques in the resistance-heating sample and the isothermal furnace-heating sample after homogenizing treatment, few significant differences in content and orientation of phases can be directly and explicitly found except the thermal effect from the applied electric current. The results will provide reference to this prospective forming and welding techniques and the application for Ti2AlNb alloys using resistance heating in the near future.

关键词： Ti2AlNb resistance heating thermal behavior joule heat

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Highly sensitive giant magnetoimpedance in a solenoid containing FeCo-based ribbon

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Chinese Physics B 2012年第3期21卷 423-427页

作者：方允樟许启明郑金菊吴锋民叶慧群斯剑霄郑建龙范晓珍杨晓红 School of Material Science and Engineering Xi'an University of Architecture and Technology Research Center for Light Emitting Diodes Zhejiang Normal University Jinhua Polytechnic

The highly sensitive giant magneto-impedance effect in a solenoid containing a magnetic core of ***19.2 （FeCo-based） ribbon under a weak magnetic field （WMF） is presented in this paper. The FeCo-based amorphous ribbon is prepared by single roller quenching and annealed with joule heat in a flowing nitro- gen atmosphere. The giant magnetoimpedance effect in solenoid （GMIES） profiles are measured with an HP4294A impedance analyzer. The result shows that the CMIES responds to the WMF sensitively （as high as 1580 %/A.m-1）. The high sensitivity can be obtained in a moderate narrow range of annealing current density （30-34 A/mm2） and closely depends on the driven current frequency. The highest sensitivity （1580 %/A.m-1） is obtained when the FeCo- based amorphous ribbon is annealed at 32 A/mm2 for 10 min and then driven with an alterning current （AC） at the frequency of 350 kHz. The highly sensitive GMIES under the WMF may result from the multiple magnetic-anisotropic structure, which is induced by the temperature gradient produced during joule-heating the ribbon.

关键词： giant magneto-impedance FeCo-based ribbon joule heat weak magnetic field

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Analysis and finite element simulation of electromagnetic heating in the nitride MOCVD reactor

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Chinese Physics B 2009年第11期18卷 5072-5077页

作者：李志明郝跃张进成许晟瑞倪金玉周小伟 School of Microelectronics Xidian University Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices

Electromagnetic field distribution in the vertical metal organic chemical vapour deposition （MOCVD） reactor is simulated by using the finite element method （FEM）. The effects of alternating current frequency, intensity, coil turn number and the distance between the coil turns on the distribution of the joule heat are analysed separately, and their relations to the value of joule heat are also investigated. The temperature distribution on the susceptor is also obtained. It is observed that the results of the simulation are in good agreement with previous measurements.

关键词： MOCVD finite element electromagnetic heating joule heat

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Effect of temperature field on solidification structure of pure Al under pulse magneto-oscillation

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China Foundry 2011年第2期8卷 172-176页

作者： Li Bo Yin Zhenxing Gong Yongyong LJ Kefeng Zheng Hongxing Li Renxing Zhai Qijie Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing Shanghai University Shanghai 200072 China Instrumental Analysis ＆ Research Center Shanghai University Shanghai 200444 China

This article discusses the effect of temperature field on the Pulse Magneto-Oscillation(PMO) induced solidification refinement of pure aluminium to provide more information for the industrial application of the PMO solidification *** temperature field is altered mainly by applied variable cooling conditions and pulse *** results show that the refinement effect in the case of full sand mould applied is weakened with the decreasing of cooling rate,however,in the alternative case,the sand mould whose sand bottom was replaced by a graphite block is favorable to the survival of equiaxed *** refinement mechanism is discussed in terms of the relationship between temperature field and the formation process of solidified *** formation or survival of nucleus depends on both temperature field and joule heat produced by PMO,both low pulse frequency and high pulse current were experimentally confirmed to be effective;and PMO was demonstrated high potential in industrial application.

关键词： pulse magneto-oscillation (PMO) solidification structure grain refinement joule heat

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Numerical Simulation of Directional Solidification of a Nickel-Based Superalloy With Applied Direct Current

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Journal of Iron and Steel Research International 2012年第S1期19卷 158-161页

作者： FENG Xiao-hui YANG Yuan-sheng Institute of Metal Research Chinese Academy of Sciences

A macroscopic thermal field calculation and a microstructure simulation are performed to investigate the directional solidification of a nickel-based superalloy with applied direct current in this *** heat effects of electric current passing through the solidification interface as joule heat and Peltier heat are investigated in the *** calculated result shows that the joule heat improves the temperature gradient in the solidification interface,while the effect of Peltier heat is negligible for macroscopic thermal *** directional growth of dendrites under the influence of joule heat is investigated with *** is found that under the influence of joule heat,the dendrites are provided with self-adjustment ability of coordinating growth to achieve flat interface in macroscale during directional solidification with the direct electric *** interesting phenomenon is brought by the crowdedly passing through the dendrite of electric current in the solidification interface for the large difference of the electrical resistivity between solid state and melt of the superalloy.

关键词： directional solidification dendrite growth direct current joule heat

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