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Corrosion behavior of Q235B carbon steel in simulated seawater pumped storage system under operational conditions

Journal of Oceanology and Limnology 2020年第5期38卷 1537-1547页

作者： YANG Dan HUANG Yanliang LI jianqiu gao Yanming ZHAO Xia XU Weichen CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China CSG Power Generation Co. Ltd.Guangzhou 511400China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237Chin a 5 Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Seawater pumped storage systems have bright prospect for energy storage in the coming *** operational conditions of seawater pumped storage system are complex and harsh,where metal materials suff er from severe general and local *** corrosion behavior of Q235B carbon steel in simulated seawater pumped storage system under operational conditions was studied by potentiodynamic polarization,cyclic potentiodynamic polarization,and scanning electron microscope(SEM).The results confi rm that the working pressure aff ected the corrosion resistance of Q235B carbon steel during the whole immersion *** pressure promoted the electrochemical reaction of corrosion process and the corrosion rate increased with pressure at the initial immersion ***,the stable rust layer formed after longtime immersion at diff erent pressures increased the corrosion resistance of carbon steel,and decreased the corrosion degree of carbon ***,the working pressure aff ected the pitting corrosion behavior of Q235B carbon steel during the whole immersion *** pitting corrosion potential was more negative and the tendency of pitting corrosion was higher at 4 MPa during the whole immersion ***,pressure also accelerated the formation rate of protective rust layer on the steel surface.Q235B carbon steel has higher susceptibility to pitting corrosion at 4 MPa in the static seawater.

关键词： seawater pumped storage system seawater pipeline pressure corrosion resistance pitting corrosion

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广东省一次飞机暖云催化响应的双偏振雷达观测分析

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气象与环境科学 2024年第3期47卷 82-92页

作者：高建秋肖辉姚展予陈昌何松蔚李铸杰广东省人工影响天气中心广州510641 中国气象局云降水物理与人工影响天气重点开放实验室北京100081 中国气象局广州热带海洋气象研究所广州510641 中国气象局人工影响天气中心北京100081

为研究飞机暖云焰剂催化后云系发生的物理响应,利用汕尾市双偏振雷达观测量及反演的云微物理特征参量,结合大气环境场探测数据,对2020年8月30日在广东省汕尾市北部区域实施的催化过程进行了分析,结果显示:这次过程是盛夏季节副高边缘的... 详细信息

为研究飞机暖云焰剂催化后云系发生的物理响应,利用汕尾市双偏振雷达观测量及反演的云微物理特征参量,结合大气环境场探测数据,对2020年8月30日在广东省汕尾市北部区域实施的催化过程进行了分析,结果显示:这次过程是盛夏季节副高边缘的一次以暖云降水为主的对流性降水过程,天气尺度系统强迫较弱,大气层结不稳定,但水汽不充沛。在积云发展的暖云阶段引入吸湿性催化剂,16 min之后,暖云云系体积开始增加,差分反射率因子、差分相移率、雨水含量及降水强度的平均值都有明显增长,雨滴尺度增大、浓度明显增加,雨滴质量平均直径(D_(m))和表征雨滴数浓度的标准化参数(lgNW)增长幅度分别达到10.3%和39.5%,云系维持了大约1.5 h。吸湿性核先在催化层附近吸收水汽增长为数量众多的小云滴,与自然对流发展伴随的上升气流加强相互叠加,增强了云滴的碰并过程。众多小雨滴被上升气流带入0℃层之上使过冷雨滴短暂增多,促进了霰粒子的生成。

关键词：飞机作业暖云催化响应双偏振雷达微物理特征

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Process simulation and energy integration in the mineral carbonation of blast furnace slag

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Chinese Journal of Chemical Engineering 2019年第1期27卷 157-167页

作者： jianqiu gao Chun Li Weizao Liu Jinpeng Hu Lin Wang Qiang Liu Bin Liang Hairong Yue Guoquan Zhang Dongmei Luo Siyang Tang School of Chemical Engineering Sichuan University

Large quantities of blast furnace(BF) slag and CO_2 are discharged annually from iron and steel industries, along with a large amount of waste *** mineral carbonation of BF slag can not only reduce emissions of solid waste but also realize the in-situ fixation of CO_2 with low energy consumption if integrated with the waste heat *** this study, based on our previous works, Aspen Plus was employed to simulate and optimize the carbonation process and integrate the process *** effects of gehlenite extraction, MgSO_4 carbonation,and aluminum ammonium sulfate crystallization were studied *** simulation results demonstrate that 2.57 kg of BF slag can sequester 1 kg of CO_2, requiring 5.34 MJ of energy(3.3 MJ heat and 2.04 MJ electricity), and this energy includes the capture of CO_2 from industrial flue *** 60 kg net CO_2 emission reduction could be achieved for the disposal of one ton of BF *** addition, the by-product,aluminum ammonium sulfate, is a high value-added *** economic analysis indicates that the profit for the whole process is 1127 CNY per ton of BF slag processed.

关键词： Blast furnace slag Mineral carbonation Process simulation and energy integration Utilization of solid residuals Ammonium alum Ammonium sulfate

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Value of Fiberoptic Ductoscopy in Diagnosing and Treating Multiporous Nipple Discharge

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Chinese Journal of Clinical Oncology 2008年第3期5卷 211-214页

作者： Lijin Wang Shaoshi Yang Baojiu Xie Jie gao jianqiu Chen Department of Surgery the 2nd Hospital ofTianjin Medical University Tianjin 300211China.

OBJECTIVE To explore the value of fiberoptic ductoscopy in diagnosing and treating bilateral and polyporous nipple discharge (ND).METHODS Fiberoptic ductoscopy was conducted in 29 patients with bilateral and polyporous *** the ductoscopy,the patients with intraductal papilloma (IDP) underwent a surgical procedure,and the others,identified with galactostasis,mammary duct ectasia (MDE) and obstructive galactophoritis (OG),received a ductoscopy-guided interventional therapy. RESULTS Among 29 cases,and with 79 galactophores examined,IDP was found in 11 cases (37.9% of the total cases),or 13.9% of the galactopores *** was found in 9 of 11 cases with a bloody nipple discharge,while IDP was seen in 2 of the 18 cases with a non-bloody nipple *** excision accuracy achieved 100% in the cases,and postoperative pathological diagnosis accordance rate reached 88.9%. CONCLUSION Fiberoptic ductoscopy has many features such as ability to see the lesion,and accurate preoperative localization,thus eliminating excessive excision of tissue during *** most patients with ND,especially those suffering galactostasis,OG or MDE,washout under fiberoptic ductoscopy and interventional therapy may achieve a thorough cure of the disease.

关键词： fiberoptic ductoscopy polyporous nipple discharge diagnosis treatment.

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世界最先进生物质精炼厂的过去与未来

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国际造纸 2014年第4期33卷 64-73页

作者：高建秋

介绍了以木质纤维为原料的生物质精炼厂所面临的工艺和市场方面的挑战,指出为了满足市场发展需求,需要不断开发新工艺和新产品。文章以挪威Borregaard公司为例,详述了生物质精炼厂利用生物质原料获得最具潜力的新产品,如微纤化纤维素(M... 详细信息

介绍了以木质纤维为原料的生物质精炼厂所面临的工艺和市场方面的挑战,指出为了满足市场发展需求,需要不断开发新工艺和新产品。文章以挪威Borregaard公司为例,详述了生物质精炼厂利用生物质原料获得最具潜力的新产品,如微纤化纤维素(MFC)、通过非木材纤维原料获得水溶性特种木素、木质纤维素乙醇、蛋白质基化学品和糖基化学品,同时,给出了生物质精炼厂长期运行的经验和开发新产品的主要途径。

关键词：生物质原料精炼厂非木材纤维原料纤维素乙醇世界木质纤维市场发展长期运行

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Record-high efficiency perovskite LEDs achieved by accelerating radiative recombination

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Science China Materials 2024年第9期67卷 3039-3040页

作者： Feng gao Department of Physics Chemistry and BiologyLinköping UniversityLinköping58183Sweden

Light-emitting diodes(LEDs)have revolutionized the lighting and displays due to their superior energy *** increasing demand for more efficient and brighter thin-film LEDs in flat-panel displays and solid-state lighting applications has driven extensive research into perovskite materials,which show great promise for high brightness and efficiency.

关键词： lighting radiative high

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Stress tensor determination by modified hydraulic tests on pre-existing fractures:Method and stress constraints

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1637-1648页

作者： Guiyun gao Chenghu Wang Ke gao National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing100085China Beijing Engineering Research Center of Earthquake Observation Beijing100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing100085China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen518055China

The hydraulic testing of pre-existing fractures(HTPF)is one of the most promising in situ stress measurement methods,particularly for three-dimensional stress tensor ***,the stress tensor determination based on the HTPF method requires at least six tests or a minimum of 14-15 tests(under different conditions)for reliable *** this study,we modified the HTPF method by considering the shear stress on each pre-existing fracture,which increased the number of equations for the stress tensor determination and decreased the number of tests *** shear stresses were attributed to different fractures by random sampling;therefore,the stress tensors were obtained by searching for the optimal solution using the least squares criterion based on the Monte Carlo ***,we constrained the stress tensor based on the tensile strength criterion,compressive strength criterion,and vertical stress *** inverted stress tensors were presented and analyzed based on the tensorial nature of the stress using the Euclidean mean stress *** stress-measurement campaigns in Weifang(Shandong Province,China)and Mercantour road tunnel(France)were implemented to highlight the validity and efficiency of the modified HTPF(M-HTPF)*** results showed that the M-HTPF method can be applied for stress tensor inversion using only three to four tests on pre-existing fractures,neglecting the stress *** inversion results were confined to relatively small distribution dispersions and were significantly reliable and stable due to the shear stresses on the fractures and the stress constraints *** M-HTPF method is highly feasible and efficient for complete stress tensor determination in a single borehole.

关键词： Stress tensor Hydraulic tests on pre-existing fractures Mean stress Stress constraint Hydraulic fracturing

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Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： Kun gao Yan Peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

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Numerical simulation of fluid flow and free surface fluctuations during wheel and belt casting process

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Journal of Iron and Steel Research International 2024年第5期31卷 1117-1126页

作者： Kun gao Yan Peng National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao066004HebeiChina

The unstable fluid flow and severe free surface fluctuations in the wheel and belt caster can affect the quality of the cast *** lower level height tends to entrap inclusions in the molten *** the other hand,the higher level height makes the production process more dangerous due to the overflow of high temperature fluid from the mold.A computational model of the molten metal pouring process was *** transient fluid flow and free surface fluctuations behavior were calculated using the three-dimensional large eddy simulation model and the volume of fluid *** results show that the flow velocity of the main jet gradually decreases under the influence of the low kinetic energy fluid in the *** is an obvious oscillation in the tail of the jet,while the flow field is asymmetric in *** jet is closer to the inside radius side due to the Coanda effect,and there is a recirculation zone on the inside radius and the outside radius respectively,according to the 10 s time-averaged *** with the industrial observation and simulation results,the shape of the free surface is a wave that varies with *** addition,the free surface height is lowest and the flow velocity is highest in the region near the jet.

关键词： Fluid flow Free surface Wheel and belt caster Large eddy simulation Volume of fluid method

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On the core entropy of Newton maps

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Science China Mathematics 2024年第1期67卷 77-128页

作者： Yan gao Department of Mathematics Shenzhen UniversityShenzhen 518060China

In this paper,we define the core entropy for postcritically-finite Newton maps and study its continuity within this *** show that the entropy function is not continuous in this family,which is different from the polyn... 详细信息

关键词： core entropy extended Newton graph critical marking polynomial Newton map

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