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锅炉压力容器压力管道检验的裂纹问题探讨

石化技术 2015年第12期22卷 125-页

作者：康新刚福建省锅炉压力容器检验研究院龙岩分院福建龙岩364000

锅炉压力容器压力管道中的裂纹问题是火电厂生产中最大的安全隐患,因此,安全管理人员在生产中应及时检验出裂纹问题,并积极采取有效措施以预防裂纹的出现。

关键词：锅炉压力容器压力管道裂纹

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加强检测机构仪器设备管理的思考

科技传播 2010年第9期2卷 52-52,134页

作者：康新刚新疆克拉玛依市特种设备安全检验所新疆克拉玛依834000

检测仪器设备管理是检测机构日常管理工作中的重要内容之一。本文从5个方面对如何加强检测机构的仪器设备管理进行了思考。

关键词：检测机构仪器设备管理

Current advances and future perspectives of additive manufacturing for functional polymeric materials and devices

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SusMat 2021年第1期1卷 127-147页

作者： Chuhong Zhang Yijun Li Wenbin kang xingang Liu Qi Wang State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan UniversityChengduP.R.China

Three-dimensional(3D)printing has received extensive attention due to its unique multidimensional functionality and customizability and has been recognized as one of the most revolutionary manufacturing *** 3D printed products represent an important orientation for next-generationmanufacturing and attract a great spotlight for the application in sensors,actuators,robots,electronics,and medical ***,the lack of functions of printing polymeric materials dramatically limits the development of functional 3D *** from traditional processing,the physical properties,such as geometry and rheological behavior,of the polymericmaterialsmust match the printing process,making the selection of printable materials *** importantly,challenges in large-scale production of such materials further stifle the development of functional 3D printing *** this review,we aim to outline recent advances in polymeric materials and methodologies for the functional 3D printing *** reports are classified based on functionalities,including electronic conductive,thermally conductive,electromagnetic interference shielding,energy storage,and energy harvesting *** study attempts to provide a comprehensive overview of the challenges and opportunities for 3D printing functional polymeric materials/devices,also seeks to enlighten the orientation of future research in this field.

关键词： 3D printing polymeric functional materials and devices polymer processing

Numerical modeling of SiC by low-pressure chemical vapor deposition from methyltrichlorosilane

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1733-1743页

作者： kang Guan Yong Gao Qingfeng Zeng xingang Luan Yi Zhang Laifei Cheng Jianqing Wu Zhenya Lu School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Science and Technology on Thermostructural Composite Materials Laboratory School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China MSEA International Institute for Materials Genome Gu'an 065500China

The development of functional relationships between the observed deposition rate and the experimental conditions is an important step toward understanding and optimizing low-pressure chemical vapor deposition(LPCVD)or low-pressure chemical vapor infiltration(LPCVI).In the field of ceramic matrix composites(CMCs),methyltrichlorosilane(CH3 SiCl3,MTS)is the most widely used source gas system for SiC,because stoichiometric SiC deposit can be facilitated at 900°C–1300°***,the reliability and accuracy of existing numerical models for these processing conditions are rarely *** this study,a comprehensive transport model was coupled with gas-phase and surface *** resulting gas-phase kinetics was confirmed via the measured concentration of gaseous *** relationship between deposition rate and 24 gaseous species has been effectively evaluated by combining the special superiority of the novel extreme machine learning method and the conventional sticking coefficient *** kinetics were then proposed and shown to reproduce the experimental *** proposed simulation strategy can be used for different material systems.

关键词： Chemical vapor deposition MTS/H2 Gas-phase and surface kinetics Extreme learning machine method Numerical model

Solid-state mechanochemistry advancing two dimensional materials for lithium-ion storage applications:A mini review

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Nano Materials Science 2023年第2期5卷 210-227页

作者： xingang Liu Wenbin kang Xi Li Li Zeng Yijun Li Qi Wang Chuhong Zhang State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan UniversityChengdu610065China

The vigorous development of two-dimensional(2D)materials brings about numerous opportunities for lithiumion batteries(LIBs)due to their unique 2D layered structure,large specific surface area,outstanding mechanical and flexibility properties,*** technologies for production of 2D materials include but are not limited to mechanochemical(solid-state/liquid-phase)exfoliation,the solvothermal method and chemical vapor *** this review,strategies leading to the production of 2D materials via solid-state mechanochemistry featuring traditional high energy ball-milling and Sichuan University patented pan-milling are *** mechanism involving exfoliation,edge selective carbon radical generation of the 2D materials is delineated and this is followed by detailed discussion on representative mechanochemical techniques for tailored and improved lithium-ion storage *** the light of the advantages of the solid-state mechanochemical method,there is great promise for the commercialization of 2D materials for the next-generation high performance LIBs.

关键词： Two-dimensional materials Solid-state mechanochemistry Ball-milling Pan-milling Lithium-ion batteries

Characteristics and formation mechanism of regional haze episodes in the Pearl River Delta of China

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Journal of Environmental Sciences 2018年第1期30卷 236-249页

作者： Wenguang Li xingang Liu Yuanhang Zhang kang Sun Yusheng Wu Rui Xue Limin Zeng Yu Qu Junling An State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 10087SChina State Key Joint Laboratory of Environment Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChineseAcademy of SciencesBeijing 100029China

To investigate the characteristics and the specific mechanism of continuous haze,comprehensive measurements were conducted from 15 October to 19 November in the Atmospheric Environment Monitoring Super-Station in Heshan of Guangdong *** haze episodes occurred in October and November 2014 in the Pearl River Delta（PRD）region. The meteorological parameters, gas data, chemical compositions, and optical parameters of the aerosols were obtained. Among these events, the second haze episode,with the highest concentration of PM2.5 of 187.51 μg/m^3, was the most severe. NO^3-was always higher than SO_4^（2-）, which indicated that motor vehicles played an important role in the haze, even though the oxidation rate from SO_2 to SO_4^（2-）was faster than that of NOXto NO_3^-. The difference between the hourly averages of Na＋and K＋during the haze episode and clean days was small, implying that straw combustion and sea salt had no significant effect on the occurrence of haze, and the backward trajectories of the air masses also conformed with this result. The air pollutants were difficult to disperse because of the significant decrease in the planetary boundary layer（PBL） height. Relative humidity played a crucial role in the formation of haze by leading to hygroscopic growth of the diameter of aerosols.

关键词： Haze episodes Chemical characteristics Formation mechanism PRD

Chemical characterization of size-resolved aerosols in four seasons and hazy days in the megacity Beijing of China

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Journal of Environmental Sciences 2015年第6期27卷 155-167页

作者： kang Sun xingang Liu Jianwei Gu Yunpeng Li Yu Qu Junling An Jingli Wang Yuanhang Zhang Min Hu Fang Zhang College of Environmental Sciences and Engineering Peking University State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of Sciences Institute for Urban Meteorology China Meteorological Administration College of Global Change and Earth System Science Beijing Normal University

Size-resolved aerosol samples were collected by MOUDI in four seasons in 2007 in Beijing. The PM10 and PM1.8mass concentrations were 166.0 ± 120.5 and 91.6 ± 69.7 μg/m^3, respectively,throughout the measurement, with seasonal variation： nearly two times higher in autumn than in summer and spring. Serious fine particle pollution occurred in winter with the PM1.8/PM10 ratio of 0.63, which was higher than other seasons. The size distribution of PM showed obvious seasonal and diurnal variation, with a smaller fine mode peak in spring and in the daytime. OM（organic matter = 1.6 × OC（organic carbon）） and SIA（secondary inorganic aerosol） were major components of fine particles, while OM, SIA and Ca^2＋were major components in coarse particles. Moreover, secondary components, mainly SOA（secondary organic aerosol） and SIA,accounted for 46%-96% of each size bin in fine particles, which meant that secondary pollution existed all year. Sulfates and nitrates, primarily in the form of（NH4）2SO4, NH4NO3, Ca SO4, Na2SO4 and K2SO4, calculated by the model ISORROPIA II, were major components of the solid phase in fine particles. The PM concentration and size distribution were similar in the four seasons on non-haze days, while large differences occurred on haze days, which indicated seasonal variation of PM concentration and size distribution were dominated by haze days. The SIA concentrations and fractions of nearly all size bins were higher on haze days than on non-haze days, which was attributed to heterogeneous aqueous reactions on haze days in the four seasons.

关键词： Chemical components Size resolved aerosols Seasonal variation Haze day Beijing

不同氯乙烯生产工艺下职业人群的肝脏损伤状况

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卫生研究 2024年第2期53卷 257-266页

作者：董一文张文翠王新刚胡伟江王鑫边洪英康宁张璘叶萌中国疾病预防控制中心职业卫生与中毒控制所北京100050 天津市滨海新区疾病预防控制中心天津300480

目的比较电石法与乙烯法2种不同工艺下氯乙烯职业接触人群的肝脏损伤状况差异并分析原因。方法2022年6—9月对天津市滨海新区某聚氯乙烯企业中电石法(78人)与乙烯法(69人)装置区的职业人群开展横断面调查。通过问卷调查收集人口学信息... 详细信息

目的比较电石法与乙烯法2种不同工艺下氯乙烯职业接触人群的肝脏损伤状况差异并分析原因。方法2022年6—9月对天津市滨海新区某聚氯乙烯企业中电石法(78人)与乙烯法(69人)装置区的职业人群开展横断面调查。通过问卷调查收集人口学信息、职业史、防护设施等资料,体检时采集静脉血(4 mL/人)及尿液(10~50 mL/人),并收集受试对象的肝功能指标及肝脏B超结果。经ELISA法测定血清中8羟基脱氧鸟苷(8-hydroxy-2 deoxyguanosine,8-OHdG),经固相萃取-离子色谱法测定尿中的亚硫基二乙酸(thiodiglycolic acid,TDGA)浓度。结果2组人群在年龄和性别比上具有较好的匹配性,接害工龄、饮酒及每日睡眠时长的人数构成比差异有统计学意义(P10年、习惯饮酒及每日睡眠时长<6 h等因素均为导致2组劳动者出现肝脏损伤状况的风险因素(P<0.05)。结论该PVC企业中电石组人群发生的肝脏损伤程度显著高于乙烯组,与工作场所中电石组岗位接触氯乙烯浓度较高、累积接害时间长及接害工龄长、习惯饮酒、轮班工作制导致的睡眠时间不足等因素共同作用诱发的氧化应激损伤有关。

关键词：电石法乙烯法氯乙烯亚硫基二乙酸 8-羟基脱氧鸟苷肝脏损伤

Phosphorus-doped lithium- and manganese-rich layered oxide cathode material for fast charging lithium-ion batteries

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Journal of Energy Chemistry 2021年第11期30卷 538-545,I0012页

作者： Yuqiong kang xingang Guo Zhiwu Guo Jiangang Li Yunan Zhou Zheng Liang Cuiping Han Xiangming He Yun Zhao Naser Tavajohi Baohua Li School of Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China Engineering Laboratory for Next Generation Power and Energy Storage Batteries Graduate School at ShenzhenTsinghua UniversityShenzhen 518055GuangdongChina School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China Institute of Nuclear&New Energy Technology Tsinghua UniversityBeijing 100084China Department of Chemistry Chemical-Biological CentreUmeåUniversityUmeå90187Sweden Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology Beijing 102617China

Owing to their high theoretical specific capacity and low cost, lithium- and manganese-rich layered oxide (LMR) cathode materials are receiving increasing attention for application in lithium-ion batteries. However, poor lithium ion and electron transport kinetics plus side effects of anion and cation redox reactions hamper power performance and stability of the LMRs. In this study, LMR Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2) was modified by phosphorus (P)-doping to increase Li+ conductivity in the bulk material. This was achieved by increasing the interlayer spacing of the lithium layer, electron transport and structural stability, resulting in improvement of the rate and safety performance. P^(5+) doping increased the distance between the (003) crystal planes from ~0.474 nm to 0.488 nm and enhanced the structural stability by forming strong covalent bonds with oxygen atoms, resulting in an improved rate performance (capacity retention from 38% to 50% at 0.05 C to 5 C) and thermal stability (50% heat release compared with pristine material). First-principles calculations showed the P-doping makes the transfer of excited electrons from the valence band to conduction band easier and P can form a strong covalent bond helping to stabilize material structure. Furthermore, the solid-state electrolyte modified P5+ doped LMR showed an improved cycle performance for up to 200 cycles with capacity retention of 90.5% and enhanced initial coulombic efficiency from 68.5% (pristine) or 81.7% (P-doped LMR) to 88.7%.

关键词： Lithium-ion battery Lithium-and manganese-rich layered oxide Phosphorus doping High-rate performance