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Fluid Dynamics & materials Processing 2024年第8期20卷 1773-1784页

作者： Yu Wang mengyang ma Yong Long Qingxiang Zhao Zhifei Cheng State Key Laboratory of Bridge Intelligent and Green Construction China Railway Major Bridge Engineering Group Co.Ltd.Wuhan430034China China Railway Bridge Science Research Institute. Ltd.Wuhan430034China

Shrinkage-induced cracking is a common issue in concrete structures,where the formation of cracks not only affects the aesthetic appearance of concrete but also potentially reduces its durability and *** this study,the effect of ceramsite sand addition on the properties of a ternary system of cement-ground granulated blast furnace slag(GGBFS)-phosphogypsum(PG)is *** particular,the fluidity,rheology,hydration heat,compressive strength,autogenous shrinkage,and drying shrinkage of the considered mortar specimens are *** results indicate that an increase in PG content leads to a decrease in fluidity,higher viscosity,lower exothermic peak,and lower compressive ***,the shrinkage of the mortar specimens is effectively *** incorporation of internal curing water from ceramsite sand improves fluidity,decreases both yield stress and viscosity,enhances the degree of hydration,and induces mortar ***,the inferior mechanical properties of the ceramsite sand generally produce a decrease in the compressive strength.

关键词： Phosphogypsum ceramsite sand internal curing mechanical property shrinkage

Surface water resource attenuation attribution and patterns in Hai River Basin

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Science China Earth Sciences 2024年第5期67卷 1545-1560页

作者： Qingming WANG Yong ZHAO Hao WANG Jiaqi ZHAI Yue ZHANG Fan HE Rong LIU mengyang ma State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research(IWHR)Beijing 100038China Key Laboratory of Water Safety for Beijing-Tianjin-Hebei Region of Ministry of Water Resources Beijing 100038China General Institute of Water Resources and Hydropower Planning and Design Ministry of Water ResourcesBeijing 100120China

From 1956 to 2016,Hai River Basin suffered the most severe surface water resource attenuation among the 10 first-class river basins in *** on the surface water circulation process,and evolving characteristics of precipitation and underlying surface in Hai River Basin,this study attributed the causes of surface water resource attenuation to six primary impact factors,analyzed each factor's quantitative contribution,and revealed four patterns of surface water resource attenuation in Hai River *** pattern of the dominant factor:comparing the 1980–2000 period with the 1956–1979period,the variation of precipitation is the dominant factor of which contribution is 7 billion m^(3),accounting for 59%of total11.7 billion m^(3);comparing the 2001–2016 period with the 1956–1979 period,the increasing of vegetation cover in mountainous area is the dominant factor of which contribution is 2.78 billion m3,accounting for 51%of total 4.9 billion m^(3).The pattern of spatial distributions:comparing the 2001–2016 period with the 1956–1979 period,mountainous areas were more affected by increasing vegetation cover which for example contributed 42%in Luan River Basin mountainous;the plains were more impacted by farmland ridge interception which for example contributed 51%in Beisi River Basin *** pattern of attenuation trend:comparing the 2001–2016 period with the 1980–2000 period,surface water resources in mountainous areas continued to decline,owing to the increasing water consumption of large-scale vegetation restoration,while the influence of the underlying surface changes on surface water resources in plains areas tended to remain *** pattern of reversible change:among factors led to surface water resource attenuation,the human activity,including vegetation cover increase,farmland ridge interception,and urbanization expansion,contributed 36%of the attenuation,which resulted in the variation of precipitation-runoff *** study improved the traditiona

关键词： Hai River Basin Surface water resources Contribution decomposition Quantitative contribution Attenuation patterns

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二水磷石膏-电石渣-镍铁渣三元胶凝体系的性能与微观结构

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材料导报 2024年第13期38卷 163-167页

作者：马梦阳贺行洋熊光李欣懋龙勇王福龙桥梁结构健康与安全国家重点实验室武汉430034 中铁大桥科学研究院有限公司武汉430034 湖北工业大学土木建筑与环境学院武汉430068 湖北工业大学湖北省建筑防水工程技术研究中心武汉430068 中建七局总承包有限公司郑州450000

以二水磷石膏-电石渣-镍铁渣三元胶凝体系制备全固废胶凝材料,研究电石渣与二水磷石膏掺量对三元胶凝体系性能的影响,并采用XRD、扫描电镜分析了体系的水化产物、微观形貌和元素组成。结果表明:二水磷石膏和电石渣均会降低三元胶凝体系... 详细信息

以二水磷石膏-电石渣-镍铁渣三元胶凝体系制备全固废胶凝材料,研究电石渣与二水磷石膏掺量对三元胶凝体系性能的影响,并采用XRD、扫描电镜分析了体系的水化产物、微观形貌和元素组成。结果表明:二水磷石膏和电石渣均会降低三元胶凝体系的流动度;受二水磷石膏中磷、氟等缓凝成分的影响,三元胶凝体系的凝结时间被大大延长,3 d抗压强度也随之下降,但二水磷石膏的掺入有利于后期强度的增长;电石渣的掺入缩短了三元胶凝体系的凝结时间,但降低了体系的抗压强度;三元胶凝体系的水化产物主要为C-A-S-H凝胶与钙矾石;三元胶凝体系表现出较高的膨胀率,但在2 d后体积变化趋于稳定;界面过渡区中氢氧化钙的富集与膨胀裂缝造成了高电石渣掺量情况下集料与凝胶间的黏结力下降,使抗压强度下降。

关键词：二水磷石膏镍渣电石渣微观结构自收缩

On the Increased Precipitation Recycling by Large-Scale Irrigation over the Haihe Plain

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Journal of Meteorological Research 2022年第3期36卷 450-461页

作者： Yunpeng GUI Qingming WANG Yong ZHAO mengyang ma Haihong LI Jiaqi ZHAI Enchong LI Department of Hydraulic Engineering Tsinghua UniversityBeijing 100084 State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Institute of Water Resources and Hydropower ResearchBeijing 100038

Irrigation not only plays an important role in global food security,but it also affects aspects of the regional climate,including *** this study,we proposed a simple and convenient method to quantify the contribution of large-scale irrigation to precipitation by distinguishing the amount of evaporation generated by irrigation from local evaporation based on the precipitation recycling method.A case study was presented to show the increased precipitation recycling ratio and the contribution of irrigation to precipitation during the main irrigation period in the Haihe Plain from 1961 to *** found that the average precipitation recycling rates in the Haihe Plain are 8.32%,9.74%,and 10.36%in April,may,and June,*** contribution rates of irrigation to precipitation in the Haihe Plain are 3.76%,5.12%,and 2.29%in April,may,and June,*** total contribution of irrigation to precipitation during the main irrigation period is 3.77 mm;the respective contributions in April,may,and June are 0.72,1.70,and 1.35 *** contribution of irrigation to local precipitation is relatively small as the inflow of atmospheric moisture during the irrigation period is still the main factor affecting local ***,this part of the precipitation during the irrigation period alleviates the water shortage in the Haihe Plain to some extent.

关键词： irrigation precipitation recycling contribution of irrigation to precipitation Haihe Plain

Anti-aging performance improvement and enhanced combustion efficiency of boron via the coating of PDA

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Defence Technology（防务技术） 2024年第3期33卷 399-410页

作者： Shuai ma Qinghai Shu mengyang Zhang Hongyu Huang Yansong Shi Xijuan Lv Shuai Zhao School of materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(MOE) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing100081China Tangshan Research Institute of Beijing Institute of Technology Tangshan063000HebeiChina

Boron is an ambitious fuel in energetic materials since its high heat release values,but its application is prohibited by low combustion efficiency and oxidization during *** polydopamine(PDA)was introduced into boron particles,investigating the impact of PDA content on the energetic behavior of *** results indicated that the PDA coating formed a fishing net structure on the surface of boron *** heat release results showed that the combustion calorific value of B@PDA was higher than that of the raw ***,the actual combustion heat of boron powder in B@10%PDA increased by 38.08%.Meanwhile,the DSC peak temperature decreased by 100.65℃under similar oxidation rate compared to raw ***,the B@PDA@AP and B@AP composites were prepared,and their combustion properties were *** was demonstrated that B@10%PDA@AP exhibited superior performance in terms of peak pressure and burning time,*** peak pressure is 12.43 kPa more than B@AP and burning time is 2.22 times higher than B@***,the coating of PDA effectively inhibits the oxidization of boron during storage and enhances the energetic behavior of boron and corresponding composites.

关键词： Boron particles Polydopamine Anti-aging performance improvement Heat release

Multifunctional solar-blind ultraviolet photodetectors based on p-PCDTBT/n-Ga_(2)O_(3)heterojunction with high photoresponse

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Infomat 2024年第2期6卷 118-130页

作者： Yifei Wang Zhenhua Lin Jingli ma Yongyi Wu Haidong Yuan Dongsheng Cui mengyang Kang XingGuo Jie Su Jinshui Miao Zhifeng Shi Tao Li Jincheng Zhang Yue Hao Jingjing Chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'anthe People's Republic of China School of Physics and Microelectronics Key Laboratory of Material PhysicsMinistry of EducationZhengzhou UniversityZhengzhouthe People's Republic of China Center for Spintronics and Quantum Systems State Key Laboratory for Mechanical Behavior of MaterialsDepartment of Materials Science and EngineeringXi'an Jiaotong UniversityXi'anthe People's Republic of China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi'anthe People's Republic of China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaithe People's Republic of China

Solar-blind ultraviolet(UV)photodetectors based on p-organic/n-Ga_(2)O_(3) hybrid heterojunctions have attracted extensive attention ***,the multifunctional solar-blind photodetector based on p-type poly[N-90-heptadecanyl-2,7-carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzothiadiazole)](PCDTBT)/n-type amorphous Ga_(2)O_(3)(a-Ga_(2)O_(3))is fabricated and investigated,which can work in the phototransistor mode coupling with self-powered *** the introduction of PCDTBT,the dark current of such the a-Ga_(2)O_(3)-based photodetector is decreased to 0.48 ***,the photoresponse parameters of the a-Ga_(2)O_(3)-based photodetector in the phototransistor mode to solar-blind UV light are further increased,that is,responsivity(R),photo-detectivity(D*),and external quantum efficiency(EQE)enhanced to 187 A W^(-1),1.3×10^(16) Jones and 9.1×10^(4)% under the weak light intensity of 11μW cm^(-2),*** to the formation of the built-in field in the p-PCDTBT/n-Ga_(2)O_(3) type-Ⅱ heterojunction,the PCDTBT/Ga_(2)O_(3) multifunctional photodetector shows self-powered *** responsivity of p-PCDTBT/n-Ga_(2)O_(3) multifunctional photodetector is 57.5 ma W^(-1) at zero *** multifunctional p-n hybrid heterojunction-based photodetectors set the stage for realizing high-performance amorphous Ga_(2)O_(3) heterojunction-based photodetectors.

关键词： amorphous Ga_(2)O_(3) heterojunction multifunctional PCDTBT solar-blind photodetectors

牵引网短路故障下的车体电位及车体回流分布特性

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高电压技术 2022年第4期48卷 1542-1552页

作者：周福林陈明辉熊进飞马孟阳西南交通大学电气工程学院成都610031

牵引网发生短路故障时,短路大电流会引起列车车体电位和车体回流显著增大,进而对人身安全和车载电气设备正常工作造成威胁。为准确掌握短路工况下车体电位和车体回流的分布大小,需考虑牵引网与列车接地回路间的感性耦合。为此结合牵引... 详细信息

牵引网发生短路故障时,短路大电流会引起列车车体电位和车体回流显著增大,进而对人身安全和车载电气设备正常工作造成威胁。为准确掌握短路工况下车体电位和车体回流的分布大小,需考虑牵引网与列车接地回路间的感性耦合。为此结合牵引供电系统分析和工程电磁场理论,推导了接地回路中传导电流及感应电流的相量表达式,从理论上证明了考虑感性耦合会增大车体电位及车体回流。利用建立的车–网–地耦合模型,进行仿真计算并与实测数据对比,得出:考虑感性耦合下的车体对轴端电位差仿真值比实测值小1.04 V,误差为8.9%;不考虑感性耦合下的仿真值比实测值小6.30V,误差为54.0%,验证了理论分析的正确性。最后利用考虑感性耦合的仿真模型进行车体电位及车体回流分布特性的研究,结果表明:车体对轴端电位差主要受短路点位置和列车位置的影响;车体对地电位主要受钢轨泄漏电阻的影响;车体回流主要受车体对轴端等效电阻的影响。

关键词：牵引网短路车体电位车体回流感性耦合车–网–地耦合模型

Dual‑Atom Nanozyme Eye Drops Attenuate Inflammation and Break the Vicious Cycle in Dry Eye Disease

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Nano-Micro Letters 2024年第6期16卷 439-457页

作者： Dandan Chu mengyang Zhao Shisong Rong Wonho Jhe Xiaolu Cai Yi Xiao Wei Zhang Xingchen Geng Zhanrong Li Xingcai Zhang Jingguo Li Henan Eye Hospital Henan Provincial People’s HospitalPeople’s Hospital of Zhengzhou UniversityZhengzhou 450003People’s Republic of China Department of Ophthalmology Mass Eye and EarMass General BrighamHarvard Medical SchoolBostonMA 02114USA School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA College of Chemistry Zhengzhou UniversityZhengzhou 450001People’s Republic of China

Dry eye disease(DED)is a major ocular pathology worldwide,causing serious ocular discomfort and even visual *** incidence of DED is gradually increasing with the highfrequency use of electronic *** inflammation is core cause of the DED vicious cycle,reactive oxygen species(ROS)play a pivotal role in the vicious cycle by regulating inflammation from ***,current therapies merely targeting inflammation show the failure of DED ***,a novel dual-atom nanozymes(DAN)-based eye drops are *** antioxidative DAN is successfully prepared by embedding Fe and Mn bimetallic single-atoms in N-doped carbon material and modifying it with a hydrophilic *** in vitro and in vivo results demonstrate the DAN is endowed with superior biological activity in scavenging excessive ROS,inhibiting NLRP3 inflammasome activation,decreasing proinflammatory cytokines expression,and suppressing cell ***,the DAN effectively alleviate ocular inflammation,promote corneal epithelial repair,recover goblet cell density and tear secretion,thus breaking the DED vicious *** findings open an avenue to make the DAN as an intervention form to DED and ROSmediated inflammatory diseases.

关键词： Dry eye disease DAN Dual-atom nanozyme Vicious cycle NLRP3 inflammasome Nanomedicine

1985—2020年京津冀平原水面面积演变特征及归因分析

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水利学报 2023年第4期54卷 451-460页

作者：王庆明张越窦鹏赵勇李恩冲马梦阳流域水循环模拟与调控国家重点实验室中国水利水电科学研究院北京100038 水利部水利水电规划设计总院北京100120 北京市水科学技术研究院北京100048

在国家复苏河湖生态环境的要求下,分析京津冀平原区长序列水面面积变化特征及变化原因,有助于科学制定区域生态补水量及预测补水效果。研究通过3期土地利用数据融合确定了京津冀平原区的水域面积,基于GEE(Google Earth Engine)云平台提... 详细信息

在国家复苏河湖生态环境的要求下,分析京津冀平原区长序列水面面积变化特征及变化原因,有助于科学制定区域生态补水量及预测补水效果。研究通过3期土地利用数据融合确定了京津冀平原区的水域面积,基于GEE(Google Earth Engine)云平台提取了1985—2020年京津冀平原区长序列水面面积,并分析了水域面积填充率及水面面积演变原因。结果表明,京津冀平原区水面面积呈增加趋势,与1985年相比,2020年中部平原区水域面积填充率由3.6%增加到18.5%,滨海平原区水域面积填充率由30%增加到45%;生态补水是河湖水面面积增加的主要原因,2020年较2001年中部平原区水面面积增加了176 km 2,本地和南水北调生态补水的贡献占到84%。进一步以河湖复苏为目标,从水域面积填充率的角度设置了不同情景,分别估算了不同情景下的河湖生态需水量,为未来生态补水计划提供参考。研究成果系统分析了京津冀平原区水面现状及生态补水的效果,对京津冀平原区开展合理河湖复苏措施具有重要意义。

关键词：水域面积水面面积 GEE云平台填充率生态补水

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Uniform decomposition of velocity gradient tensor

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Journal of Hydrodynamics 2024年第1期36卷 24-34页

作者： Chenxi ma Chaoqun Liu Department of mathematics University of Texas at ArlingtonArlingtonTXUSA

In this paper,the principal decomposition of the velocity gradient tensor[∇v]is discussed in 3 cases based on the discriminant∆:∆0 with 3 distinct real eigen values,and∆=0 with 1 or 2 distinct real eigen *** velocity gradient tensor can also be classified as rotation point,which can be decomposed into three parts,i.e.,rotation[R],shear[S]and stretching/compression[SC],and non-rotation point,we defined a new resistance term[L],and the tensor can be decomposed into three parts,i.e.,resistance[L],shear[S]and stretching/compression[SC].Example matric are also displayed to demonstrate the new *** of principal decomposition between 3 different cases,and between Resistance and Liutex will also be discussed.

关键词： Velocity gradient Liutex resistance fluid kinematics