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Microstructure of a Ti–50wt% Ta alloy produced via laser powder bed fusion

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Acta Metallurgica Sinica(English Letters) 2020年第7期33卷 981-990页

作者： Lei-Lei Xing cong-cong zhao Hao Chen Zhi-Jian Shen Wei Liu School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Jihua Laboratory 13th FloorChengye buildingNanping West Road No.13GuichengNanhai districtFoshan cityGuangdong province 528000China Arrhenius Laboratory Department of Materials and Environmental ChemistryStockholm University10691StockholmSweden

Ti-Ta alloys have been widely studied for biomedical applications due to their high biocompatibility and corrosion *** this work,nearly fully dense and in situ alloyed Ti-50 wt% Ta samples were fabricated by the laser powder bed fusion(LPBF) of mechanically mixed *** increased exposure time,and thereby increased laser energy density,insoluble Ta particles were almost dissolved,and a Ti-50 wt% Ta alloy was *** and dendritic structures were formed due to constitutional undercooling,which was caused by the high cooling rate of LPBF *** retained βphases and α " phases were observed in the LPBFed Ti-50 wt% Ta *** α" phase was found at the boundary of the cellular structures,where the tantalum content was not high enough to suppress the bcc lattice transition completely but could suppress the β phase→α’ phase transition.

关键词： alloy Microstructure corrosion

A review of tungsten fabricated via laser powder bed fusion

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Tungsten 2021年第2期3卷 218-233页

作者： Kai-Lun Li Jin-Han Chen cong-cong zhao Zhi-Jian Shen Wei Liu Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Jihua Laboratory Foshan 528000China Arrhenius Laboratory Department of Materials and Environmental ChemistryStockholm University10691 StockholmSweden

Tungsten and its alloys with high strength,thermal conductivity,and plasma radiation resistance are highly desirable for applications in medical,electronic and also nuclear ***,the high melting point and high ductile–brittle transition temperature limit the fabrication of complex parts by using traditional methods,such as powder *** a kind of additive manufacturing technology,laser powder bed fusion(LPBF)was used to fabricate tungsten and its alloys in recent years because of its high energy density and low action *** paper reviewed the recent progress of LPBF fabricated *** main challenges,which are the lack of density and cracking problem,are *** methods to solve these problems are *** terms of improving the density,decreasing oxygen content,optimizing the process parameter,and adopting spherical powder were proved *** terms of cracking problem,the method of alloying,such as adding secondary phase nanoparticles and alloy elements,could significantly reduce the cracking ***,the crack problem has not been completely solved up to ***,future developments and potential new research directions for LPBF tungsten are proposed.

关键词： Tungsten Additive manufacturing Densification Cracking

A risk assessment method considering risk attributes and work safety informational needs and its application

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Chinese Journal of Chemical Engineering 2024年第4期68卷 253-262页

作者： cong Luo Yunsheng zhao Ke Xu School of Political Science and Public Administration Shandong UniversityQingdao 266200China Faculty of Engineering China University of GeosciencesWuhan 430074China Department of Emergency Management of Hubei Province Wuhan 430064China

The technological revolution has spawned a new generation of industrial systems,but it has also put forward higher requirements for safety management accuracy,timeliness,and *** assessment needs to evolve to address the existing and future challenges by considering the new demands and advancements in safety *** study aims to propose a systematic and comprehensive risk assessment method to meet the needs of process system safety *** methodology first incorporates possibility,severity,and dynamicity(PSD)to structure the“51X”evaluation indicator system,including the inherent,management,and disturbance risk ***,the four-tier(risk point-unit-enterprise-region)risk assessment(RA)mathematical model has been established to consider supervision *** in conclusion,the application of the PSD-RA method in ammonia refrigeration workshop cases and safety risk monitoring systems is presented to illustrate the feasibility and effectiveness of the proposed PSD-RA method in safety *** findings show that the PSD-RA method can be well integrated with the needs of safety work informatization,which is also helpful for implementing the enterprise's safety work responsibility and the government's safety supervision responsibility.

关键词： Risk assessment Safey “51X”evaluation indicator system Four-tier risk assessment model Risk attributes Process system

Vancomycin dosing in an obese patient with acute renal failure:A case report and review of literature

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World Journal of Clinical Cases 2022年第18期10卷 6218-6226页

作者： Kun-Yan Xu Dan Li Zhen-Jie Hu cong-cong zhao Jing Bai Wen-Li Du Department of Pharmacy Fourth Hospital of Hebei Medical UniversityShijiazhuang 050011Hebei ProvinceChina Department of Intensive Care Unit Fourth Hospital of Hebei Medical UniversityShijiazhuang 050011Hebei ProvinceChina

BACKGROUND Vancomycin is the most commonly used drug for methicillin-resistant Staphylococcus *** empirical clinical doses of vancomycin based on non-obese patients may not be optimal for obese *** SUMMARY This study reports a case of vancomycin dosing adjustment in an obese patient(body mass index 78.4 kg/m2)with necrotizing fasciitis of the scrotum and left lower extremity accompanied with acute renal *** adjustment was performed based on literature review and factors that influence pharmacokinetic parameters are *** results of the blood drug concentration monitoring confirmed the successful application of our dosing adjustment strategy in this obese *** body weight is an important consideration for vancomycin administration in obese patients,which affects the volume of distribution and clearance of *** alterations of pharmacokinetic parameters dictate that vancomycin should be dose-adjusted when applied to obese *** the same time,the pathophysiological status of patients,such as renal function,which also affects the dose adjustment of the patient,should be *** Monitoring vancomycin blood levels in obese patients is critical to help adjust the dosing regimen to ensure that vancomycin concentrations are within the effective therapeutic range and to reduce the incidence of renal injury.

关键词： Vancomycin Obesity Acute renal failure Pharmacokinetics Case report

A Study of the Effect of the Miller Cycle on the Combustion of a Supercharged Marine Diesel Engine

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Energy Engineering 2024年第5期121卷 1363-1380页

作者： Lingjie zhao cong Li Mechanical and Automotive Engineering School Shanghai University of Engineering ScienceShanghai201600China

The Miller cycle is a program that effectively reduces NOx emissions from marine diesel engines by lowering the maximum combustion temperature in the cylinder,thereby reducing NOx *** effectively investigate the impact of Miller cycle optimum combustion performance and emission capability under high load conditions,this study will perform a one-dimensional simulation of the performance of a marine diesel engine,as well as a threedimensional simulation of the combustion in the cylinder.A 6-cylinder four-stroke single-stage supercharged diesel engine is taken as the research *** chassis dynamometer and other related equipment are used to build the test system,carry out the diesel engine bench test,and collect experimental *** simulation results are compared with the test results,and the error is less than 5%.In this study,the authors will use simulation software to simulate several Miller cycle scenarios designed for early inlet valve closure and analyze the impact of the Miller cycle on combustion and emissions at 100%load *** comparing the flow field distribution of the engine at 1500 r/min condition,it was found that proper EIVC can prolong the ignition latency period and homogeneous fuel-air mixture combustion acceleration,but it can reduce pressure and temperature within the piston chamber and NOx ***,the Miller cycle reduces end-of-compression temperatures,which increases combustion duration and exhaust temperatures,making it difficult to improve fuel economy at the optimum fuel consumption point,and closing the intake valves prematurely leads to excessive fuel ***,temperature and heat release rate within the piston chamber,NOx,and SOOT generation were significantly enhanced.

关键词： Miller cycle EIVC combustion NOx emissions marine diesel

Multi-performance evaluation of high-throughput accelerated corrosion test for high-strength low-alloy 921A steel

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Journal of Iron and Steel Research International 2024年第5期31卷 1260-1278页

作者： cong-cong Du Ming-hua Qin Zhan-fang Wu Dong-ling Li Lei zhao Xiang-yang Li Hai-zhou Wang Beijing Advanced Innovation Center for Materials Genome Engineering National Center for Materials Service SafetyUniversity of Science and Technology BeijingBeijing100083China China Iron and Steel Research Institute Group Co. Ltd.Beijing100081China Beijing Advanced Innovation Center for Materials Genome Engineering Central Iron and Steel Research InstituteBeijing100081China

The corrosion behavior of high-strength low-alloy 921A steel in a simulated marine atmospheric environment was studied using a high-throughput experimental *** corrosion behavior,corrosion morphology,and corrosion products of 921A steels were analyzed using various techniques,including corrosion mass loss method,polarization curve,white-light interferometry,scanning electron microscopy,energy-dispersive spectrometry,microbeam X-ray fluorescence spectrometry,X-ray diffraction technique,and X-ray photoelectron *** test results indicated that 921A steel exhibits better corrosion resistance than Q450NQR1 steel in simulated harsh atmospheric environments,as evidenced by a lower corrosion mass loss rate throughout the corrosion *** corrosion products of both steels consisted ofα-FeOOH,Fe_(3)O_(4),andγ-FeOOH,withα-FeOOH being more prevalent in the rust layer of 921A steel than in Q450NQR1 *** inner rust layer of 921A steel also exhibited an appositional enrichment region of Cr,Ni,Mo,and V,leading to its superior corrosion resistance compared to that of Q450NQR1 *** efficacy of high-throughput accelerated corrosion experimental methods was highlighted for evaluating the corrosion resistance of steel materials in harsh environmental *** findings suggest that 921A steel exhibits better corrosion resistance compared to Q450NQR1 steel and has the potential to be more suitable in harsh marine atmospheric *** characterization of the rust layer structures and composition reveals the parallel enrichment of certain elements in the inner rust layer of 921A steel,which enhances its corrosion resistance.

关键词： Atmospheric corrosion High-throughput experimental method High-strength low-alloy steel Corrosion characteristics Rust layer Element enrichment

Numerical simulation of liquid sloshing in a spherical tank by MPS method

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Journal of Hydrodynamics 2024年第2期36卷 232-240页

作者： cong-yi Huang Ji-fei Wang Wei-wen zhao De-cheng Wan Computational Marine Hydrodynamic Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Aerospace System Engineering Institute Shanghai201109China

This paper investigates the sloshing phenomena in a spherical liquid tank using the moving particle semi-implicit(MPS)method,a crucial study in fluid *** from previous research focused on rectangular or LNG tanks,this work explores the unique motion patterns inherent to spherical *** accuracy of our in-house MPS solver MLParticle-SJTU is validated against experimental data and finite volume method(FVM).And the MPS method reveals a closer alignment with experimental outcomes,which suggests that MPS method is particularly effective for modeling complex,non-linear fluid *** the fluid’s response to excitation at its natural frequency is simulated,showcasing vigorous sloshing and rotational *** analyses of the fluid motion are conducted by drawing streamline diagrams,velocity vector diagrams,and vorticity *** fluid’s motion response is explored using both time-domain and frequency-domain curves of the fluid centroid,as well as the sloshing force.

关键词： Moving particle semi-implicit(MPS)method spherical tank liquid sloshing model experiment

Coordinated Capacitor Voltage Balancing Method for Cascaded H-bridge Inverter with Supercapacitor and DC-DC Stage

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CES Transactions on Electrical Machines and Systems 2024年第2期8卷 191-201页

作者： Ye Zhang Zixin Li Fanqiang Gao cong zhao Yaohua Li IEEE Key Laboratory of High Density Electromagnetic Power and Systems(Chinese Academy of Sciences) Institute of Electrical EngineeringChinese Academy of SciencesHaidian District University of Chinese Academy of Sciences Shijingshan District

Cascaded H-bridge inverter(CHBI) with supercapacitors(SCs) and dc-dc stage shows significant promise for medium to high voltage energy storage applications. This paper investigates the voltage balance of capacitors within the CHBI, including both the dc-link capacitors and SCs. Balance control over the dc-link capacitor voltages is realized by the dcdc stage in each submodule(SM), while a hybrid modulation strategy(HMS) is implemented in the H-bridge to balance the SC voltages among the SMs. Meanwhile, the dc-link voltage fluctuations are analyzed under the HMS. A virtual voltage variable is introduced to coordinate the balancing of dc-link capacitor voltages and SC voltages. Compared to the balancing method that solely considers the SC voltages, the presented method reduces the dc-link voltage fluctuations without affecting the voltage balance of SCs. Finally, both simulation and experimental results verify the effectiveness of the presented method.

关键词： Cascaded H-bridge inverter(CHBI) Hybrid modulation strategy(HMS) Capacitor voltage balancing DClink voltage fluctuation Supercapacitor(SC)

Copper-based nanomaterials as peroxidase candidates for intelligent colorimetric detection and antibacterial applications

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Particuology 2024年第1期84卷 126-135页

作者： Yanyan Huang Huimin Zhong cong Jiang Jiahui Yang Jingwen Zhang Fei zhao Chaoqun Liu College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing210037China College of Pharmacy Institutes of Environment and MedicineHenan UniversityKaifeng475004China

With natural polyphenol compound tannic acid(TA)as the ingredient,copper tannate(CuTA)nanolayer material was formed by self-assembly under the conditions of heating and copper *** ion and tannic acid could coordinate to form Cu-O-C structure which was similar to the Fe-N-C structure of natural heme *** addition,the obtained CuTA nanomaterial possessed excellent peroxidase-like catalytic activity and *** on this excellent enzymatic activity,CuTA nanomaterials could be used for colorimetric detection of hydrogen peroxide with a smartphone and decomposition of organic *** on the structural characteristics and catalytic activity,the copper tannate nanozymes could also serve as potential antibacterial reagents to effectively inhibit the growth of gram-negative and positive bacteria in a low hydrogen peroxide *** work may promote the exploration of novel peroxidase mimetics and broaden the applications of nanozymes.

关键词： Nanozyme Colorimetric detection Smartphone Antibacteria