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Experimental study on the mechanism of flow blockage formation in fast reactor

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Nuclear Science and Techniques 2023年第6期34卷 171-182页

作者： wen-hui Jin Song-Bai Cheng Xiao-Xing Liu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai519082China

Various sources of solid particles might exist in the coolant flow of a liquid metal cooled fast reactor(e.g.,through chemical interaction between the coolant and impurities,air,or water,through corrosion of structural materials,or from damaged/molten fuel).Such particles may cause flow blockage accidents in a fuel assembly,resulting in a reduction in coolant flow,which potentially causes a local temperature rise in the fuel cladding,cladding failure,and fuel *** understand the blockage formation mechanism,in this study,a series of simulated experiments was conducted by releasing different solid particles from a release device into a reducer pipe using *** detailed analyses,the influence of various experimental parameters(e.g.,particle diameter,capacity,shape,and static friction coefficient,and the diameter and height of the particle release nozzle)on the blockage characteristics(i.e.,blockage probability and position)was *** the current range of experimental conditions,the blockage was significantly influenced by the aforementioned *** ratio between the particle diameter and outlet size of the reducer pipe might be one of the determining factors governing the occurrence of ***,increasing the ratio enhanced blockage(i.e.,larger probability and higher position within the reducer pipe).Increasing the particle size,particle capacity,particle static friction coefficient,and particle release nozzle diameter led to a rise in the blockage probability;however,increasing the particle release nozzle height had a downward influence on the blockage ***,blockage was more likely to occur in non-spherical particles case than that of spherical *** study provides a large experimental database to promote an understanding of the flow blockage mechanism and improve the validation process of fast reactor safety analysis codes.

关键词： Liquid metal cooled fast reactor Flow blockage Granular jamming Experimental study

Weak-force sensing with squeezed optomechanics

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Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 71-81页

作者： wen Zhao Sheng-Dian Zhang Adam Miranowicz hui Jing Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China College of Physics and Materials Science Henan Normal UniversityXinxiang 453007China Faculty of Physics Adam Mickiewicz UniversityPozna´n 61-614Poland

We investigate quantum-squeezing-enhanced weak-force sensing via a nonlinear optomechanical resonator containing a movable mechanical mirror and an optical parametric amplifier(OPA). Herein, we determined that tuning the OPA parameters can considerably suppress quantum noise and substantially enhance force sensitivity, enabling the device to extensively surpass the standard quantum limit. This indicates that under realistic experimental conditions, we can achieve ultrahigh-precision quantum force sensing by harnessing nonlinear optomechanical devices.

关键词： weak-force sensing squeezing optomechanics

Sensitive Group Actions on Regular Curves of Almost≤n Order

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Acta Mathematica Sinica,English Series 2023年第2期39卷 277-284页

作者： Su Hua WANG En hui SHI hui XU Zhi wen XIE Department of Mathematics and Physics Suzhou Vocational UniversitySuzhou215104China School of Mathematical Sciences Soochow UniversitySuzhou215006China

Let X be a regular curve and n be a positive integer such that for every nonempty open set U⊂X,there is a nonempty connected open set V⊂U with the cardinality|∂_(X)(V)|≤*** show that if X admits a sensitive action of a group G,then G contains a free subsemigroup and the action has positive geometric *** a corollary,X admits no sensitive nilpotent group action.

关键词： Sensitivity regular curve ping pong game geometric entropy nilpotent group

Influences of the Welding Heat Input and the Repeated Repair Welding on Ti–3Al–2.5V Titanium Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 684-691页

作者： hui-Jun Yi Yong-Jun lee Kwang-O lee School of Mechanical Engineering Pusan National University

The primary purpose of this study was to determine the effects of gas tungsten arc welding heat input on the high-temperature tensile properties, toughness, and microstructural features of titanium alloy Ti-3A1-2.5V. The secondary objective was to examine the effect of the repeated repair welding on the properties of the alloy. It was also found that the mechanical properties progressively decreased with increasing the repair welding cycles, especially in the case of the weldment after the first welding repair. It was observed that the sizes of the acicular and prior β grain boundaries as well as the volume fraction of the acicular phases increased with increasing the welding heat input. In addition, the amount and size of the acicular a1 phases were found to increase with increasing the repair welding cycles.

关键词： Ti-3AI-2.5V Repair welding Heat input Tensile properties Microstructure

Tuning electronic structure of Pt to enhance ethanol electrooxidation performance of SnO_(2) patched ultrathin PtRhNi nanowires

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Rare Metals 2023年第11期42卷 3614-3621页

作者： Xiao-Kun Fan wen Chen Yun-Hua Zhu wen-hui Wang Bay Area Center for Electron Microscopy Songshan Lake Materials LaboratoryDongguan523808China School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen518055China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai200092China

Developing highly active and stable Pt-based nanocatalysts towards the ethanol oxidation reaction(EOR)is still a challenge for the commercialization of direct ethanol fuel ***,SnO_(2) patched ultrathin PtRhM(M=Ni or C... 详细信息

关键词： nanowires electronic structure

Electrochemical Detection of Horseradish Peroxidase at Zeptomole Level

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Chinese Chemical Letters 2002年第10期13卷 971-972页

作者： Zhi hui HE wen Rui JIN School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100

An electrochemical method for determination of horseradish peroxidase (HRP) was developed using a capillary catalytic system. HRP can be measured in several minutes with a detection limit of 4.8 x 10(-12) mol/L or 47 ... 详细信息

关键词： Electrochemical detection catalytic reactor horseradish peroxidase.

Treatment status of extremely premature infants with gestational age<28 weeks in a Chinese perinatal center from 2010 to 2019

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World Journal of Pediatrics 2022年第1期18卷 67-74页

作者： wen-wen Zhang Yong-hui Yu Xiao-Yu Dong Simmy Reddy Department of Neonatology Shandong Provincial Hospital Afliated to Shandong First Medical UniversityJinan 250021China Department of Neonatology Shandong Maternal and Child Health HospitalJinan 250021China Cheeloo College of Medicine Shandong UniversityJinanChina

Background There is a paucity of studies conducted in China on the outcomes of all live-birth extremely premature infants(EPIs)and there is no unifed recommendation on the active treatment of the minimum gestational age in the feld of perinatal medicine in *** aimed to investigate the current treatment situation of EPIs and to provide evidence for formulating reasonable treatment *** We established a real-world ambispective cohort study of all live births in delivery rooms with gestational age(GA)between 24+0 and 27+6 weeks from 2010 to *** Of the 1163 EPIs included in our study,241(20.7%)survived,while 849(73.0%)died in the delivery room and 73(6.3%)died in the neonatal intensive care *** all included EPIs,862(74.1%)died from withholding or withdrawal of *** of stratifcation according to GA or birth weight,the proportion of total mortality attributable to withdrawal of care is *** infants with the GA of 24 weeks,active treatment did not extend their survival time(P=0.224).The survival time without severe morbidity of the active treatment was signifcantly longer than that of withdrawing care for infants older than 25 weeks(P<0.001).Over time,the survival rate improved,and the withdrawal of care caused by socioeconomic factors and primary nonintervention were reduced signifcantly(P<0.001).Conclusions The mortality rate of EPIs is still *** of care is common for EPIs with smaller GA,especially in the delivery *** is necessary to use a multi-center,large sample of real-world data to fnd the survival limit of active treatment based on our treatment capabilities.

关键词： Active treatment Extremely premature Infants Mortality rate Withdrawal of care

Novel hydrophobically associative polyacrylamide with tunable viscosity

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Chinese Chemical Letters 2009年第11期20卷 1361-1365页

作者： Xu Feng Zhang wen hui Wu School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China

Hydrophobically associative polyacrylamide （HAPAM） were prepared in aqueous solution by radical copolymerization of novel cationic surface-active monomer, dimethylhexadecyl（3-acrylamidopropyl）ammonium bromide （DMHAB）, with acrylamide （AM） in the presence of DMHAB/CTAB mixed micelles. The length of hydrophobic microblock （NH） in HAPAM is controlled by the molar fraction of DMHAB in mixed micelles, which can be mediated by the ratio of CTAB to DMHAB. The results of steady-state fluorescence probe and viscometry experiments showed the ability of HAPAM association was determined by the length of the hydrophobic microblock. HAPAM with tunable association ability are promising materials for thickening agent.

关键词： Hydrophobically associative polyacrylamide Surface-active monomer Mixed micelles Hydrophobic association

Determination of Thyroxine with Capillary Electrophoretic Enzyme Immunoassay

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Chinese Chemical Letters 2002年第9期13卷 871-873页

作者： Zhi hui HE wen Rui JIN School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100

A Capillary electrophortic enzyme linked immunoassay with electrochemical detection (CE-EIA-ED) has been developed. The method can be used to determine thyroxine with a limit of 3.8×10-9 mol/L.

关键词： Capillary electrophortic enzyme immunoassay electrochemical detection thyroxine.