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Effects of chloride on electrochemical and stress corrosion cracking behavior of 9Cr ferritic-martensitic steel

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Journal of Iron and Steel Research International 2020年第6期27卷 719-731页

作者： Zhen Zhang zheng-fei Hu Liang he xiao-bo Zhang Xin-xian Fang Bao-sen Zhang Zhi-xin Ba Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167JiangsuChina School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167JiangsuChina School of Materials Science and Engineering Tongji UniversityShanghai 201804China School of Materials Science and Engineering Georgia Institute of TechnologyAtlanta 30332-0620USA

The electrochemical and stress corrosion cracking behavior of 9Cr ferritic-martensitic steel is investigated in the chloride environment by using the traditional electrochemical method, the scanning vibrating electrode technique and the slow strain rate test (SSRT). Results of the static corrosion tests and corrosion morphology show that the prior austenite grain boundaries and martensite lath boundaries are the preferred sites for pit nucleation and growth in chloride environment. Results of SSRT coupled with insitu electrochemical test show that the transition from pitting corrosion to uniform corrosion, as well as the nucleation of stress corrosion crack, is the synergistic effects of the chloride and applied load. Stress corrosion cracking of the steel in the chloride environment can be divided into three different regions as follows: fast and uniform corrosion activ-ity, microcrack nucleation and propagation, and active crack growth regions.

关键词： 9Cr ferritic-martensitic steel Chloride In situ electrochemical test Scanning vibrating electrode technique Stress corrosion cracking

Microstructure and impact toughness of 16MND5 reactor pressure vessel steel manufactured by electrical additive manufacturing

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Journal of Iron and Steel Research International 2020年第8期27卷 992-1004页

作者： Xi-kou he Chang-sheng Xie Li-jun xiao Ying Luo Di Lu zheng-dong Liu Xi-tao Wang Institute for Special Steels China Iron and Steel Research InstituteBeijing 100081China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610041SichuanChina Southern Additive Science and Technology Co. Ltd.Foshan 528225GuangdongChina

Electrical additive manufacturing can improve manufacturing efficiency and reduce the cost of 16MND5 reactor pres-sure vessel steel. Impact tests were conducted to compare the impact toughness of 16MND5 steels manufactured by the electrical additive manufacturing and conventional forging, respectively. It is found that the impact toughness of electrical additive manufacturing specimen was slightly higher than that of conventional forging specimen. The characterizations of microstructure show that there were large ferrites and carbides in electrical additive manufacturing specimen. The fracture mechanisms of electrical additive manufacturing specimen were that microvoids or microcracks were prone to nucleate at the large ferrite/bainite interface and large carbide/bainitic ferrite interface, where the stress concentration was high. In addi-tion, the block size and high-angle grain boundaries played a vital role in hindering crack propagation of electrical additive manufacturing specimen, helping to improve the impact energy and leading to a low ductile–brittle transition temperature. The results suggest that the electrical additive manufacturing technology was an effective method to enhance the impact toughness of 16MND5 steel.

关键词： Electrical additive manufacturing 16MND5 steel Impact toughness Fracture High-angle grain boundary

Effect of electropulsing on austenite to ferrite transformation in low-carbon steel

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Journal of Iron and Steel Research International 2021年第4期28卷 437-444页

作者： zheng-hai Zhu Li Zhou Fei he xiao-fang Shi Li-zhong Chang Hai-jun Wang Hong-biao Dong School of Metallurgic Engineering Anhui University of TechnologyMaanshan 243002AnhuiChina School of Engineering University of LeicesterLeicester LE17RHUK

We explore the application of electropulsing for the control of phase transformation in a low-carbon *** effect of electropulsing on the transformation from austenite to ferrite in continuous casting low-carbon steel slab has been studied through experimental and thermodynamic *** results reveal that electropulsing promotes the precipitation of ferrite within austenite grain in the low-carbon *** the electropulsing intensity increases,the precipitation of ferrite increases within austenite grains,and ferrite omentum precipitates become thinner along the austenite grain *** results provide a basis for controlling the austenite to ferrite transformation in low-carbon steel.

关键词： Electropulsing Austenite Ferrite Transformation Nucleation Low-carbon steel

Impact of China’s Air Pollution Prevention and Control Action Plan on PM2.5 chemical composition over eastern China

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Science China Earth Sciences 2019年第12期62卷 1872-1884页

作者： Guannan GENG Qingyang xiao Yixuan zheng Dan TONG Yuxuan ZHANG xiaoye ZHANG Qiang ZHANG Kebin he Yang LIU Department of Environmental health Rollins School of Public HealthEmory UniversityAtlantaGeorgia 30322USA Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Key Laboratory for Atmospheric Chemistry Chinese Academy of Meteorological SciencesCMABeijing 100081China

China promulgated the Air Pollution Prevention and Control Action Plan(the Action Plan)in 2013 and developed stringent control measures to mitigate fine particulate matter(PM2.5) ***,we investigated the PM2.5 chemical composition changes over eastern China associated with the Action Plan during 2013-2017 using satellite-based PM2.5 chemical composition data derived using CMAQ simulations and satellite *** PM2.5 concentrations decreased considerably during this time as a result of the reductions in all chemical species in *** population-weighted mean concentrations over eastern China decreased from 11.1 to 6.7μgm-3 for SO42-,13.8-13.1μgm-3 for NO3-,7.4-5.8μgm-3 for NH4+,9.9-8.4μgm-3 for OM,4.6-3.8μg m-3 for BC and 12.9-9.6μg m-3 for other species in ***42-had the largest reduction of 40%,while NO3-had the lowest reduction of 5%,resulting in a greater fraction of NO3-and a smaller fraction of SO42-in *** the three key regions,Beijing-Tianjin-hebei had the largest reduction in PM2.5 and its chemical *** decrease in SO42-concentrations was in line with the reduction of SO2 emissions,and the major driver of the SO2 emission reductions was the industrial *** decrease in NO3 concentrations was limited because the decrease in SO2 emissions and the stable NH3 emissions facilitated the formation of NO3-from HNO3,which partially offset the reduction in NOx emissions driven by the power *** mitigate PM2.5 pollution more effectively,future efforts are needed to reduce NH3 emissions.

关键词： PM25 chemical composition Air Pollution Prevention and Control Action Plan Satellite remote sensing

Flowfield of a helicopter submerged inlet with power output shaft

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Acta Mechanica Sinica 2021年第1期37卷 156-168,I0003页

作者： he-Xia Huang Hui-Jun Tan zheng-Kang Lin Zi-Jie Li Shu Sun Hao Chen Zhi-Xiang xiao Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China School of Aerospace Engineering Tsinghua UniversityBeijing100084China

The submerged inlet is an attractive configuration for advanced helicopters due to its high stealth performance and low external *** this paper,a submerged inlet,integrated with a ROBIN helicopter fuselage and a simplified power output shaft,is experimentally and numerically investigated to obtain the basic flow characteristics under a freestream velocity of 23.6 m/*** results indicate that the pylon ahead of the inlet induces a horseshoe *** the vortex is ingested into the inlet,it has little effect on the internal flows and can be *** the airflow enters into the inlet,it interacts with the shaft with a large incidence angle,yielding a vortex *** the leeside of the shaft,the two side flows of the shaft impinge at the center plane,generating a local high-pressure region at the azimuthal angle of 180°,which forces the boundary layer to roll up a counter-rotating vortex *** addition,the airflow adjacent to the cowl lip accelerates rapidly,resulting in a local low-pressure region at the azimuthal angle of 0°.Therefore,the inlet duct has a strong circumferential pressure gradient,which originates from an azimuthal angle of 180°to 0°and induces a vortex pair at the azimuthal angle of 0°.The three vortex pairs are the main origins of the distortion at the duct exit plane,among which the one near the cowl lip with the azimuthal angle of 0°plays the dominant ***,as the velocity ratio increases from 3.9 to 5.5,the circumferential pressure gradient and the cowl lip vortex get intensified,which causes that the total-pressure recovery coefficient drops by 0.5%and the distortion index increases by 28%.

关键词： Submerged inlet helicopter Vortex pair

Interspecies Phylogenetic Analysis of Clonorchis sinensis in High-incidence Areas of Hunan Province, China

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Biomedical and Environmental Sciences 2021年第11期34卷 881-890页

作者： LONG xiao Lei WANG Shi Ping ZHOU Shuai Feng LI zheng Xiang ZHUANG Shi Feng he Zhuo Department of Medical Parasitology Xiangya School of MedicineCentral South UniversityChangsha 410028HunanChina Hunan Provincial Center for Disease Control and prevention Changsha 410005HunanChina

Objective This study aims to investigate the infection of Clonorchis sinensis(***)in highincidence areas of Hunan Province,*** phylogenetic analysis of the *** species in the highly infected areas was carried *** Infection of the definitive human host and intermediate fish host by *** was investigated,and the mitochondrial genes cox1 and Nad1 were used as genetic markers for phylogenetic *** In 2016–2020,the average population infection rate of Hunan was 1.38%,while in Tongdao County the rate was up to 26.90%,and the highest fish infection rate was detected in Qiyang County(99.44%in the dorsal fin of crucian carp).High genetic sequence similarity was observed in the samples from Qiyang and Lengshuitan which exhibited high homology with those from Guangdong and Gansu,whereas the parasitic species from Tongdao was highly homologous with those located in high-latitude ***,no significant difference was found in the gene sequence of the parasitic species in definitive hosts dogs and *** The systematically study of *** infection in the high-incidence areas will contribute greatly to the prevention and effectively controlling the spread of Clonorchis sinensis in Hunan Province The endemic of *** infection in Hunan Province is the result of co-action of local and foreign parasite species.

关键词： Clonorchis sinensis Mitochondrial genes Coxl Nodi Phytogeny

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高温环境对激光火工品发火性能的影响

火工品 2025年第1期 32-36页

作者：鱼小港贺爱锋陈建华郑薇杨安民祝捷李敏杰陕西应用物理化学研究所瞬态化学效应与控制全国重点实验室陕西西安710061 中北大学环境与安全工程学院山西太原030051

为了研究高温环境对激光火工品发火性能的影响,建立了激光火工品的热力场仿真模型,并搭建光学测试系统,探究了激光火工品自聚焦透镜在100℃高温下的激光光斑尺寸变化。仿真结果表明:高温环境下自聚焦透镜长度产生92.4μm的变形量,导致... 详细信息

为了研究高温环境对激光火工品发火性能的影响,建立了激光火工品的热力场仿真模型,并搭建光学测试系统,探究了激光火工品自聚焦透镜在100℃高温下的激光光斑尺寸变化。仿真结果表明:高温环境下自聚焦透镜长度产生92.4μm的变形量,导致激光光斑尺寸从94μm增大至150μm;试验结果表明:高温环境下激光火工品输出光斑在243~272μm之间变化,自聚焦透镜变形量的增大导致激光火工品的刺激功率密度降低、作用时间超差。研究表明自聚焦透镜变形降低了激光火工品的发火可靠性。

关键词：激光火工品自聚焦透镜激光光斑发火可靠性高温环境

Pulmonary embolism with acute pancreatitis:A case report and literature review

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World Journal of Gastroenterology 2012年第6期18卷 583-586页

作者： Qing Zhang Qing-Xia Zhang xiao-Ping Tan Wei-zheng Wang Chang-Hua he Li Xu xiao-Xia Huang Department of Internal medicine Clinical Medical college of Yangtze UniversityJingzhou 434000Hubei ProvinceChina Department of Gastroenterology No.1 Hospital Affiliated to Yangtze UniversityJingzhou 434000Hubei ProvinceChina The second Hospital of Jingzhou Jingzhou 434000Hubei ProvinceChina Department of Respiratory No.1 Hospital Affiliated to Yangtze UniversityJingzhou 434000Hubei ProvinceChina

Acute pancreatitis is an inflammatory disease characterized by local tissue injury which can trigger a systemic inflammatory *** vascular complications of pancreatitis are a major cause of morbidity and *** embolism in acute pancreatitis has been reported to be very *** reported a case of pulmonary embolism with acute pancreatitis.A 38-year-old woman broke out upper abdomen pain without definite *** had no nausea and vomiting,fever,dyspnea,cough and expectoration,chest *** patient had been diagnosed with acute pancreatitis in local *** patient was treated with antibiotics and proton pump inhibitors,and the abdomen pain was alleviated *** the patient came forth cough and expectoration with a little blood,progressive dyspnea.A computed tomographic scan of the abdomen re-vealed *** computer tomography angiography of chest revealed pulmonary embolism(both down pulmonary arteries,left pulmonary artery and branch of right pulmonary artery).Dyspnea of the patient got well with thrombolytic treatment and anticoagulation *** embolism is a rare but potentially lethal complication of *** with this complication will aid in its early diagnosis,therapy and prevent pulmonary embolism,a rare but catastrophic phenomenon.

关键词： Pulmonary embolism Pancreatitis

Conversion therapy in advanced perihilar cholangiocarcinoma based on patient-derived organoids:A case report

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World Journal of Gastrointestinal Oncology 2024年第10期16卷 4274-4280页

作者： Yong-Gang he Ling-Yu Zhang Jing Li zheng Wang Chong-Yu Zhao Lu zheng xiao-Bing Huang Department of hepatobiliary The Second Affiliated Hospital of Army Medical UniversityChongqing 400037China School of Clinical Oncology Fujian Medical UniversityFujian Cancer HospitalFuzhou 350014Fujian ProvinceChina Fujian Key Laboratory of Translational Cancer Medicine Fuzhou 350014Fujian ProvinceChina

BACKGROUND Patient-derived organoids(PDOs)have been demonstrated to predict the response to drugs in multiple cancer ***,it remains unclear about its application in *** SUMMARY A 59-year-old woman was admitted to the hospital due to upper abdominal pain for over 8 *** to relevant examinations,she was diagnosed as perihilar cholangiocarcinoma(pCCA)with intrahepatic metastasis and perihilar lymphatic *** multidisciplinary team discussion,percutaneous transhepatic cholangiodrainage was performed to relieve biliary obstruction,and puncture biopsy was conducted to confirm the pathological *** chemoembolization with nab-paclitaxel was used in combination with toripalimab and lenvatinib,but the levels of tumor markers including alpha fetal protein,carcinoembryonic antigen,carbohydrate antigen 15-3 and cancer antigen 125 were still *** PDO for drug screening showed sensitive to gemcitabine and ***,the chemotherapy regimen was adjusted to gemcitabine and cisplatin in combination with toripalimab and *** 4 cycles of treatment,the tumor was assessed resectable,and radical surgical resection was performed *** year after surgery,the patient was still alive,and no recurrence or *** PDOs for drug sensitivity contribute to screening effective chemotherapy drugs for advanced pCCA,promoting conversion therapy and improving the prognosis.

关键词： Patient-derived organoids Perihilar cholangiocarcinoma Conversion therapy Drug screening Intrahepatic metastasis Case report