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2014-2018年江苏省人源喹诺酮耐药1,4,[5],12:i:-沙门氏菌的基因组学初步分析

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中国人兽共患病学报 2024年第8期40卷 739-744页

作者：郑东宇马恺周翌婧吴高林霍翔乔昕江苏省疾病预防控制中心南京210009 国家卫生健康委员会肠道病原微生物重点实验室南京210009 江苏省新发突发重大传染病病原微生物重点实验室南京210009

目的分析江苏省喹诺酮耐药1,4,[5],12:i:-沙门氏菌分子流行病学特征。方法用cgMLST分析江苏省及欧美来源菌株的分子流行病学特征,并初步分析喹诺酮耐药1,4,[5],12:i:-沙门氏菌可能的传播特征。结果13株喹诺酮耐药1,4,[5],12:i:-沙门氏... 详细信息

目的分析江苏省喹诺酮耐药1,4,[5],12:i:-沙门氏菌分子流行病学特征。方法用cgMLST分析江苏省及欧美来源菌株的分子流行病学特征,并初步分析喹诺酮耐药1,4,[5],12:i:-沙门氏菌可能的传播特征。结果13株喹诺酮耐药1,4,[5],12:i:-沙门氏菌共注释11大类抗性基因(Antibiotic resistance genes,ARGs)。其中氨基糖苷类ARGs检出率最高(100%);12株喹诺酮耐药菌株(92.3%)均携带IncHI2/IncHI2A质粒类型;不同国家/地区来源菌株质粒介导喹诺酮耐药(PMQR)基因携带分析显示美国及欧洲来源菌株携带6类PMQR基因,qnrB19检出率最高。江苏省来源菌株携带3类PMQR基因类型,aac(6′)-Ib-cr检出率最高(11.84%);不同国家/地区来源菌株cgMLST位点差异分析显示形成3个主要流行谱系。结论江苏省人源喹诺酮耐药1,4,[5],12:i:-沙门氏菌分离株与欧美菌株可能具有共同进化来源,PMQR基因携带水平存在国家/地区差异。

关键词： 1,4,,12:i:-沙门氏菌喹诺酮耐药分子流行病学

A Public Health Perspective on Influenza Status in the Context of COVID-19 Pandemic, 2019−2020

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China CDC weekly 2020年第44期2卷 870-872页

作者： xiang huo Fengcai Zhu Jiangsu Provincial CDC NanjingJiangsuChina

The possible dual epidemic of coronavirus disease 2019(COVID-19)and influenza in the coming winter raises serious concerns for the northern hemisphere as it will likely result in an expanded disease burden and overloading of public health institutions and clinical capacities as a result of continued increasing mental stress for the public and depletion of public *** questions remain regarding how the flu season might affect the COVID-19 pandemic and vice versa.

关键词： likely continued winter

Porosity and permeability variations of a dam curtain during dissolution

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Water Science and Engineering 2019年第2期12卷 155-161页

作者： Ji-xiang huo Fu-heng Ma Xiao-lei Ji State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China College of Construction Engineering Jiangsu Open UniversityNanjing 210019China

During reservoir operation,the erosion effects of groundwater change the porosity and permeability of the dam curtain,causing changes to the seepage *** understand where the changes take place and to what degree the porosity and permeability change,a multi-field coupling model was built and *** model takes into account seepage,solution concentration,and solid *** model was validated using uplift pressure monitoring ***,the variations in curtain porosity,seepage flow,and loss quantity of Ca(OH)2 were *** key time nodes were obtained through curve fitting of the variation of seepage flow with the BiDoseResp *** results showed that the model could reflect the attenuation trend of curtain performance *** process and position of the erosion were not *** erosion mainly occurred at the top and bottom of the curtain,it was most developed at the *** erosion effects developed slowly during the early stage,much fast during the middle and late stages,and culminated in complete *** model results and the daily monitoring data can provide a scientific basis for the safe operation and management of reservoirs.

关键词： Dam curtain Permeability Multi-field coupling model Porosity Erosion Solute transport Seepage flow

Effect of Annealing Temperature on Recrystallization Behavior of Cold Rolled Ti-Microalloyed Steel

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Journal of Iron and Steel Research International 2013年第9期20卷 105-110页

作者： huo xiang-dong MAO Xin-ping L Sheng-xia School of Material Science and Engineering Jiangsu University Guangzhou Zhujiang Steel Co. Ltd.

In order to develop cold rolled Ti-microalloyed steel strips, the effects of annealing temperature on recrys-tallization behavior of experimental steel were researched by optical microscopy （OM）, transmission electron micros-copy （TEM） and Vickers hardness test. The annealing treatment could be divided into three distinct stages： recovery, recrystallization and grain growth. Reerystallization took place from 933 to 1033 K, during which a large number of recrystallized grains appear and hardness drops sharply. The morphology and size of TiN particles nearly remained unchanged at different stages of processing. With increasing annealing temperature, nanometer precipitates coarsened and the dislocation density was significantly reduced. In comparison with annealing time, annealing temperature was more crucial for recrystallization of cold rolled Ti microalloyed steel. It could be concluded that the pinning force of nanometer particles on dislocations increased the recrystallization temperature. At higher annealing temperature, re crystallization took place because of precipitates coarsening caused by Ostwald ripening.

关键词： annealing temperature recrystallization Ti-microalloyed steel titanium earbide dislocation

Effects of TMCP Schedule on Precipitation,Microstructure and Properties of Ti-microalloyed High Strength Steel

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Journal of Iron and Steel Research International 2016年第6期23卷 593-601页

作者： xiang-dong huo Lie-jun LI Zheng-wu PENG Song-jun CHEN School of Material Science and Engineering Jiangsu University School of Mechanical and Automotive Engineering South China University of Technology

Using the similar compositions of the Ti-microalloyed high-strength steels produced by the thin-slab casting process of compact strip production（CSP）,four thermo-mechanical control processes（TMCP）after the simulated thickslab casting,*** two hot rolling routes and the two cooling processes,were designed,aiming at achieving the same mechanical properties as the thin strip *** final microstructures after the four TMCP processes were examined by optical microscope（OM）,scanning electron microscope（SEM）and transmission electron microscope（TEM）.The tensile properties and Charpy impact energy were measured ***-induced TiC precipitation was found in the two-stage rolling route with the finish rolling temperature at low levels,leading to grain refinement due to the pinning effect during austenite *** hardening in ferrite was observed when a period of isothermal holding was applied after hot *** could be concluded that both finish rolling temperature and the subsequent isothermal holding temperature were crucial for the achieved strength level due to the combined effect of grain refinement and precipitation *** the same time,it was found that the isothermal holding led to poor impact toughness because of remarkable precipitation ***,it was suggested that the precipitation kinetics of titanium carbides in both austenite and ferrite should be investigated in future.

关键词： TMCP refinement hardening holding rolling titanium isothermal Precipitation austenite ferrite

Isothermal transformation and precipitation behaviors of titanium microalloyed steels

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Journal of Iron and Steel Research International 2021年第3期28卷 335-345页

作者： xiang-dong huo Kang He Ji-nian Xia Lie-jun Li Song-jun Chen School of Material Science and Engineering Jiangsu UniversityZhenjiang212013JiangsuChina Technology Quality Center Shandong Iron and Steel Group Laiwu Co.Ltd.Laiwu271104ShandongChina Technology and Quality Center Shandong Iron and Steel Group Rizhao Co.Ltd.Rizhao276826ShandongChina School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510640GuangdongChina

The microstructure transformation and precipitation behavior of nano-carbides in Ti microalloyed steel during isothermal process were studied by a compression test on a Gleeble 3800 thermomechanical simulator and analyzed by optical microscopy,transmission electron microscopy and other *** results show thatγ→αphase transformation and TiC precipitation take place in Ti microalloyed steel during the isothermal process,and time–temperature–transformation curve and precipitation–time–temperature(PTT)curve are all of“C”-*** the isothermal process,the interphase precipitation of TiC mostly occurs at the period of the phase transformation,and the random precipitation of TiC mostly occurs on the ferrite after the phase *** increment in yield strength at the initial stage of isothermal transformation mainly comes from phase transformation *** the increase in isothermal time,the precipitation hardening effect becomes more important for nucleation and growth of titanium carbides and eventually reaches the maximum value at the precipitation finished point of the PTT curve.

关键词： Ti microalloyed steel Isothermal process Transformation Precipitation hardening Nanometer carbide

The Implementation of Keren Imagie Registration System on Raspberry Pi Platform

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The Implementation of Keren Imagie Registration System on Ra...

第36届中国控制会议

作者： FENG Zhen GUO Yanning XING Jingyi huo xiang Harbin Institute of Technology

ISBN: (纸本)9781538629185

Currently,the image registration algorithm is mainly implemented on *** this paper,to realize image registration on a mobile terminal,a customized image registration system was designed and implemented on Raspberry Pi microcomputer board,in which the Keren algorithm is adopted to achieve image *** results show that this system can reach a sub-pixel level of registration with high efficiency,and still has satisfactory accuracy even for the general case that noises are included in all the ***,realizing image registration function based on the mobile terminal also makes the system more potential to be used with higher level of integration.

关键词： Raspberry Pi image registration Keren algorithm Sub-pixel

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钛微合金化高强钢的连续冷却相变规律

材料热处理学报 2024年第5期45卷 100-107页

作者：彭明天霍向东陈松军李烈军陆超方梦龙江苏大学材料科学与工程学院江苏镇江212013 华南理工大学机械与汽车工程学院广东广州510640

为了研究钛微合金化高强钢在连续冷却条件下的相变规律,通过热膨胀法及金相分析研究了低碳钢(C-Mn钢)和钛微合金钢(Ti钢)在连续冷却过程中的组织变化及过冷奥氏体的相变规律,分析了钛元素和变形对试验钢相变规律的影响,并讨论了连续冷... 详细信息

为了研究钛微合金化高强钢在连续冷却条件下的相变规律,通过热膨胀法及金相分析研究了低碳钢(C-Mn钢)和钛微合金钢(Ti钢)在连续冷却过程中的组织变化及过冷奥氏体的相变规律,分析了钛元素和变形对试验钢相变规律的影响,并讨论了连续冷却转变(CCT)与等温转变(TTT)曲线的关系。结果表明:随着冷速的增加,试验钢的主要相变组织由铁素体向贝氏体转变。在C-Mn钢中加入钛元素提高了过冷奥氏体的稳定性,抑制了铁素体和珠光体转变,促进了贝氏体转变;在奥氏体未再结晶区进行变形使试验钢的CCT曲线整体向左上方移动,提高了相变开始温度;变形提高了铁素体的形核率,促进了铁素体相变,铁素体组织得到细化;变形促进了贝氏体相变,使板条贝氏体变短,细化贝氏体组织。

关键词：钛微合金钢连续冷却相变组织演变低碳钢

Effect of cooling parameters on the microstructure and properties of Mo-bearing and Cr-bearing steels

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 551-556页

作者： xiang-dong huo Yu-qian Li Yu-tao Zhao Hai-wang Zhang Zhao-hui Li School of Material Science and Engineering Jiangsu University Zhenjiang 212013 China Technology Center of Handan Iron and Steel Corp. Handan 056002 China

To develop low-cost low carbon bainitic steel,Mo-bearing and Cr-bearing steels were melted in a vacuum induction furnace and were researched by thermal simulation and hot rolling at the *** the cooling rate increases from 0.2 to 50°C/s,the transformation temperatures of two steels lie between 650 and 400°C,and the final microstructures of them change from quasi-polygonal ferrite and granular bainite to lath *** with cooling in air or by interrupted cooling,Mo-bearing and Cr-bearing steel plates cooled by sprayed water boast higher strength and superior toughness,for large-size islands are responsible for the poor mechanical *** to Mo,Cr is effective to isolate the bainitic reaction in low carbon steel,and the bainitic microstructure can also be obtained in Cr-bearing steel cooled at a wide range of cooling rate.

关键词： low carbon steel bainite phase transformations chromium microstructure mechanical properties