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Influence rule of downtime on heat transfer in converters

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Journal of Iron and Steel Research International 2019年第3期26卷 251-258页

作者： Shuai deng An-jun Xu Rui-yu Yin School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The models for calculating the heat transfer in converters allow the accurate control of heat dissipation caused by downtime,and thus help in crease scrap ratio and reduce energy consumptio *** 17 was used to establish such a model to analyse the coupling law between the downtime and heat dissipation of the converter and the temperature drop of molten *** was measured by infrared detection,and model accuracy was verified by comparative *** variation law of the amount of cold charge added for different downtimes under different process conditions was *** results show that the range of the variation of heat dissipation caused by downtime is 8.9-78.5 *** the downtime increases by 30 min,heat dissipation of dephosphorisation(deP)and decarburisation(deC)converters increases by about 23.4 and 41.3 GJ,*** a certain smelting cycle,the temperature drop of the molten iron for deP,deC and conventional converters increases by about 12.5,15.0 and 17.0 K,respectively;and the amount of scrap added in the double-linking and conventional smelting processes decreases by 0.93 and 0.75%,respectively.

关键词： Downtime Converter heat dissipation Scrap ratio Temperature field Finite element

Influence of aeration and initial water thickness on axial velocity attenuation of jet flows

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第5期14卷 362-370页

作者： Wang-ru WEI jun deng Bin LIU State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Hydro-China Kunming Engineering Corporation

With the development of ski-jump energy dissipation for high and large discharge among the hydraulic projects,the effects of characteristics of water flow on energy dissipation are increasingly *** the present study,the effects of aeration and the initial water thickness on axial velocity attenuation of jet flow were analyzed,using variance analysis and numerical calculated *** the analysis of test data,both of the air concentration and initial water thickness are sensitive factors for the axial velocity attenuation of jet flow along the axial way,and there is no significant interaction effect between the aeration and initial water *** has a more significant effect on the axial velocity attenuation of jet *** the initial water thickness of jet flow can reduce the length of jet core,and make the initial position of axial velocity attenuation closer to the nozzle *** numerical calculation results show that aeration can contribute to the enhancement of entrainment ability of jet flow,which may improve the interaction between jet flow and *** ski-jump energy dissipation among the hydraulic projects,combining aeration with decreasing initial water thickness of jet flow is an effective way to enhance the rate of axial velocity attenuation.

关键词： Velocity Aeration Initial water thickness Jet flows

The likely counterpart to γ-ray excess from the northwest region of Arp 220

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Research in Astronomy and Astrophysics 2021年第7期21卷 171-176页

作者： Yun-Chuan Xiang jun-Hao deng Ze-jun Jiang Department of Astronomy Yunnan Universityand Key Laboratory of Astroparticle Physics of Yunnan ProvinceKunming 650091China

The unknown γ-ray excess in the northwest region of Arp 220 was revisited by analyzing~11.8 years of the Fermi Large Area Telescope(Fermi-LAT) data in this *** found that its photon flux was approximately three times higher than that of the previous study in the 0.2-100 GeV band,and the corresponding significance level ~8.15σ was approximately four times higher than *** light curves of 15 and 45 time bins from the whole time all showed two active periods,and the variability of the second period was more significant than that of the first *** spectral indices from the two active periods were not statistically different and were close to the range of γ-ray flat-spectrum radio quasars observed by *** the position of CRATES J153246+234400 was consistent with the best-fit position of our analysis,we suggest that CRATES J153246+234400 is more likely a γ-ray counterpart for the variational *** Arp 220,there was no significant variability in the γ-ray emission.

关键词： flat spectrum radio quasar:individual(CRATES J153246+234400) quasars γ-ray emission

Puncture Phenomena and Mechanism Analysis of a RTV Coated Cap and Pin Insulators in a Steep-front Impulse Voltage Test

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 832-839页

作者： Tao deng Xidong Liang Zhiyi Su jun Zhou Electrical Engineering Department Tsinghua UniversityBeijing 100084Chinaand also with Department of High VoltageChina Electric Power Research Institute Co.LtdBeijing 100192China Department Tsinghua UniversityBeijing 100084China Department of High Voltage China Electric Power Research Institute Co.LtdBeijing 100192China

In recent years,more than 6 million room temperature vulcanized(RTV)silicone rubber coated cap and pin insulators with high mechanical ratings were used in ultra-high voltage transmission lines in China to improve pollution ***,the unexpected puncture phenomena of RTV coated insulators were exposed during steep-front impulse voltage tests;for instance,the steep-front impulse voltage test pass rate decreased to less than 50% for 550 kN glass insulators with RTV *** steep-front impulse voltage test is the most effective method used to check the insulation quality of cap and pin insulators・This unexpected phenomenon once caused serious concerns to power *** this paper,several possible factors that affect the puncture of insulators were ***,the extent of the decline in the breakdown of the 550 kN glass cap and pin insulators with and without RTV coatings were *** initial puncture location was then found,and the developmental process of the arc on the insulator surface in steep-front impulse voltage tests was observed with an ultra-high-speed intensified charge coupled device ***,a breakdown mechanism is *** puncture phenomena of a RTV coated insulator in a steep-front impulse voltage test is essentially an electrical breakdown of the internal insulation・The RTV coating induces the close adherence of the arc to the surface of the *** closeness changes the arc development path on the insulator surface and facilitates easy breakdown in the shed weak *** these factors result in a significant increase in the breakdown probability of RTV coated insulators in steepfront impulse voltage tests.

关键词： Cap and pin insulator puncture RTV coating steep-front impulse voltage test

Establishment and primary application of a mouse model with hepatitis B virus replication

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World Journal of Gastroenterology 2007年第40期13卷 5324-5330页

作者： Feng-jun Liu Li Liu Fang He Su Wang Tao-you Zhou Cong Liu Lin-Yu deng Hong Tang Center of Infectious Diseases Divisionof Molecular Biology of Infectious Diseases National KeyLaboratory of Biotherapy (Sichuan University) West ChinaHospital of Sichuan University Chengdu 610041 SichuanProvince China National Key Laboratory of Biotherapy and CancerCenter West China Hospital West China Medical School SichuanUniversity Chengdu 610041 Sichuan Province China

AIM： To establish a rapid and convenient animal model with hepatitis B virus （HBV） replication.METHODS： A naked DNA solution of HBV-replicationcompetent plasmid was transferred to BALB/C mice via the tail vein, using a hydrodynamic in vivo transfection procedure. After injection, these mice were sacrificed on d 1, 3, 4, 5, 7 and 10. HBV DNA replication intermediates in the liver were analyzed by Southern blot hybridization. The expression of hepatitis B core antigen （HBcAg） and hepatitis B surface antigen （HBsAg） in the liver was checked by immunohistochemistry. Serum HBsAg and hepatitis B e antigen （HBeAg） was detected by enzyme- linked immunosorbent assay （ELISA）. Inhibition of HBV replication was compared in HBV replication model mice treated intraperitoneally with polyinosinic-polytidylin acid （polyIC） or phosphate-buffered saline （PBS）.RESULTS： After hydrodynamic in vivo transfection, HBV DNA replication intermediates in the mouse liver were detectable on d 1 and abundant on d 3 and 4, the levels were slightly decreased and remained relatively stable between d 5 and 7, and were almost undetectable on d 10. The expression patterns of HBcAg and HBsAg were similar to that of HBV replication intermediate DNA, except that they reached a peak on d 1 after injection. No obvious differences in HBV DNA replication intermediates were observed in the left, right and middle lobes of the liver. After treatment with polyIC, the level of HBV intermediate DNA in the liver was lower than that in the control mice injected with PBS.CONCLUSION： A rapid and convenient mouse model with a high level of HBV replication was developed and used to investigate the inhibitory effect of polyIC on HBV replication, which provides a useful tool for future functional studies of the HBV genome.

关键词： Animal model Gene expression Hepatitis B Virus Hydrodynamic transfection Polyinosinic-polytidylinacid Virus replication

Boosting High-Voltage Practical Lithium Metal Batteries with Tailored Additives

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Nano-Micro Letters 2024年第12期16卷 23-41页

作者： Jinhai you Qiong Wang Runhong Wei Li deng Yiyang Hu Li Niu Jingkai Wang Xiaomei Zheng junwei Li Yao Zhou jun-Tao Li College of Energy Xiamen UniversityXiamen 361005People’s Republic of China Magnetism Key Laboratory of Zhejiang Province College of Materials and ChemistryChina Jiliang UniversityHangzhou 310018People’s Republic of China Laboratory for Soft Matter and Biophysics Department of Physics and AstronomyKU Leuven3001 LeuvenBelgium State Key Lab of Physical Chemistry of Solid Surface College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005People’s Republic of China Department of Chemical Engineering KU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium College of Chemistry and Chemical Engineering Northwest Normal UniversityLanzhou 730070GansuPeople’s Republic of China

The lithium(Li)metal anode is widely regarded as an ideal anode material for high-energy-density ***,uncontrolled Li dendrite growth often leads to unfavorable interfaces and low Coulombic efficiency(CE),limiting its broader ***,an ether-based electrolyte(termed FGN-182)is formulated,exhibiting ultra-stable Li metal anodes through the incorporation of LiFSI and LiNO3 as dual *** synergistic effect of the dual salts facilitates the formation of a highly robust SEI film with fast Li+transport ***,Li||Cu half cells exhibit an average CE reaching up to 99.56%.In particular,pouch cells equipped with high-loading lithium cobalt oxide(LCO,3 mAh cm^(-2))cathodes,ultrathin Li chips(25μm),and lean electrolytes(5 g Ah-1)demonstrate outstanding cycling performance,retaining 80%capacity after 125 *** address the gas issue in the cathode under high voltage,cathode additives 1,3,6-tricyanohexane is incorporated with FGN-182;the resulting high-voltage LCO||Li(4.4 V)pouch cells can cycle steadily over 93 *** study demonstrates that,even with the use of ether-based electrolytes,it is possible to simultaneously achieve significant improvements in both high Li utilization and electrolyte tolerance to high voltage by exploring appropriate functional additives for both the cathode and anode.

关键词： Li metal anode Li dendrites LiNO_(3) 1,3,6-tricyanohexane Pouch cells

Biological identity of nanomaterials:Opportunities and challenges

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Science China Chemistry 2013年第11期56卷 1533-1541页

作者： deng jun YU DaHai GAO Changyou MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

The emergence of nanoparticles(NPs)has attracted tremendous interest of the scientific community for decades due to their unique properties and potential applications in diverse areas,including drug delivery and *** novel NPs have been synthesized and used to reduce drug toxicity,improve bio-availability,prolong circulation time,control drug release,and actively target to desired cells or ***,clinical translation of NPs with the goal of treating particularly challenging diseases,such as cancer,will require a thorough understanding of how the NP properties influence their fate in biological systems,especially in *** efforts have been paid to studying the interactions and mechanisms of NPs and *** deliberately designed,the NPs in contact with biological fluids are rapidly covered by a selected group of biomolecules especially proteins to form a corona that interacts with biological *** this view,the recent development of NPs in drug delivery and the interactions of NPs with cells and proteins are *** understanding the protein-NP interactions,some guidelines for safety design of NPs,challenges and future perspectives are discussed.

关键词： nanoparticles carriers cellular uptake protein corona

Fridman’s Invariant, Squeezing Functions, and Exhausting Domains

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Acta Mathematica Sinica,English Series 2019年第10期35卷 1723-1728页

作者： Fu Sheng deng Xu jun ZHANG School of Mathematical Sciences University of Chinese Academy of Sciences

We show that if a bounded domain Ω is exhausted by a bounded strictly pseudoconvex domain D with C^2 boundary, then Ω is holomorphically equivalent to D or the unit ball, and show that a bounded domain has to be hol... 详细信息

关键词： Squeezing function Fridman's invariant exhausting domain

ELLIPTIC EQUATIONS IN DIVERGENCE FORM WITH DISCONTINUOUS COEFFICIENTS IN DOMAINS WITH CORNERS

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Acta Mathematica Scientia 2024年第5期44卷 1903-1915页

作者： jun CHEN Xuemei deng Three Gorges Mathematical Research Center China Three Gorges UniversityYichang443002China

We study equations in divergence form with piecewise Cα*** domains contain corners and the discontinuity surfaces are attached to the edges of the *** obtain piecewise C^(1,α) estimates across the discontinuity surf... 详细信息

关键词： elliptic equations divergence form discontinuous coefficients corner regularity