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Composition design of superhigh strength maraging stainless steels using a cluster model

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Progress in Natural Science:Materials International 2014年第1期24卷 35-41页

作者： Zhen li Ruiqian Zhang qianfeng Zha Yingmin Wang Jianbing Qiang Chuang Dong School of Mechanical Engineering Dalian University of Technology Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Key Laboratory of Materials Modification Dalian University of TechnologyMinistry of Education

The composition characteristics of maraging stainless steels were studied in the present work investigation using a cluster-plus-glue-atom model. The least solubility limit of high-temperature austenite to form martensite in basic Fe–Ni–Cr corresponds to the cluster formula [NiFe12]Cr3,where NiFe12is a cuboctahedron centered by Ni and surrounded by 12 Fe atoms in FCC structure and Cr serves as glue atoms. A cluster formula [NiFe12](Cr2Ni) with surplus Ni was then determined to ensure the second phase(Ni3M) precipitation,based on which new multicomponent alloys [(Ni,Cu)16Fe192](Cr32(Ni,Mo,Ti,Nb,Al,V)16) were designed. These alloys were prepared by copper mould suction casting method,then solid-solution treated at 1273 K for 1 h followed by water-quenching,and finally aged at 783 K for 3 h. The experimental results showed that the multi-element alloying results in Ni3M precipitation on the martensite,which enhances the strengths of alloys sharply after ageing treatment. Among them,the aged [(Cu4Ni12)Fe192](Cr32(Ni8.5Mo2Ti2Nb0.5Al1V1)) alloy(Fe74.91Ni8.82Cr11.62Mo1.34Ti0.67Nb0.32Al0.19V0.36Cu1.78wt%) has higher tensile strengths with YS?1456 MPa and UTS?1494 MPa. It also exhibits good corrosion-resistance in 3.5 wt% NaCl solution.

关键词： Maraging stainless steels Composition design Cluster structure model Super-high strength

几何形态计量技术对热带臭虫的数字化标记及分析

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中国国境卫生检疫杂志 2024年第4期47卷 349-357页

作者：徐艺嘉李天一夏乾峰芦亚君国家卫生健康委员会热带病防治重点实验室海南医科大学带医学院海南海口571199 海南医科大学生物医学信息与工程学院西安交通大学基础医学院

目的研究热带臭虫形态结构特征信息,探究其特有的空间几何拓扑结构。方法使用超景深三维显微系统获取热带臭虫高清形态信息,利用几何形态计量学地标点技术确定热带臭虫形态变量框架,Adobe Illustrator软件描绘热带臭虫形态轮廓,TpsDig v... 详细信息

目的研究热带臭虫形态结构特征信息,探究其特有的空间几何拓扑结构。方法使用超景深三维显微系统获取热带臭虫高清形态信息,利用几何形态计量学地标点技术确定热带臭虫形态变量框架,Adobe Illustrator软件描绘热带臭虫形态轮廓,TpsDig v2.32软件确定地标点并提取几何形态数据变量信息,TpsSuper v2.05软件对地标点进行普氏叠加分析。结果在海南省采集48只热带臭虫,包括11只若虫、22只雌虫及15只雄虫。于若虫背面构建49个地标点,腹面构建80个地标点;于雌虫背面构建48个地标点,腹面构建81个地标点;于雄虫背面构建51个地标点,腹面构建83个地标点。根据热带臭虫不同虫期的地标点结合其外部结构,共确立110个形态变量。普氏叠加将特征地标点映射出若虫、雌虫、雄虫的背面及腹面共计6个标准化模型,以表征热带臭虫不同虫期的归一化轮廓,建立了可视化几何模型。结论基于地标点编码规则的几何形态计量技术可作为热带臭虫的分类鉴别工具,并为不同虫期的热带臭虫提供相应的几何形态计量指标。

关键词：热带臭虫几何形态计量学地标普氏叠加分析

A modified flexible spatiotemporal data fusion model

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Frontiers of Earth Science 2020年第3期14卷 601-614页

作者： Jia Tang Jingyu Zeng li Zhang Rongrong Zhang Jinghan li Xingrong li Jie Zou Yue Zeng Zhanghua Xu qianfeng Wang Qing Zhang Key Laboratory of Remote Sensing of Soil Erosion and Disaster Protection College of Environment and ResourcesFuzhou UniversityFuzhou 350116China Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijing 100094China College of Geography and Tourism Anhui Normal UniversityWuhu 241000China College of Geomatics Shandong University of Science and TechnologyQingdao 266590China Spatial Information Research Center of Fujian Province Fuzhou UniversityFuzhou 350116China Joint Global Change Research Institute Pacific Northwest National Laboratory and University of MarylandCollege ParkMD20740USA

Remote sensing spatiotemporal fusion models blend multi-source images of different spatial resolutions to create synthetic images with high resolution and frequency,contributing to time series research where high quality observations are not available with sufficient ***,existing models are vulnerable to spatial heterogeneity and land cover changes,which are frequent in human-dominated *** obtain quality time series of satellite images in a human-dominated region,this study developed the Modified Flexible Spatial-temporal Data Fusion(MFSDAF)approach based on the Flexible Spatial-temporal Data Fusion(FSDAF)model by using the enhanced linear regression(ELR).Multiple experiments of various land cover change scenarios were conducted based on both actual and simulated satellite images,*** proposed MFSDAF model was validated by using the correlation coefficient(r),relative root mean square error(RRMSE),and structural similarity(SSIM),and was then compared with the Enhanced Spatial and Temporal Adaptive Reflectance Fusion Model(ESTARFM)and FSDAF *** show that in the presence of significant land cover change,MFSDAF showed a maximum increase in r,RRMSE,and SSIM of 0.0313,0.0109 and 0.049,respectively,compared to FSDAF,while ESTARFM performed best with less temporal difference of in the input *** conditions of stable landscape changes,the three performance statistics indicated a small advantage of MFSDAF over FSDAF,but were 0.0286,0.0102,0.0317 higher than for ESTARFM,*** showed greater accuracy of capturing subtle changes and created high-precision images from both actual and simulated satellite images.

关键词： MFSDAF enhanced linear regression land cover change heterogeneous time-series

基于三维数值模拟和切线角理论的露天煤矿滑坡灾害预防技术

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中国煤炭 2024年第2期50卷 50-56页

作者：赵立春贺希格图王京伟徐勇超李文海许乾峰扎鲁特旗扎哈淖尔煤业有限公司内蒙古自治区通辽市029100

露天煤矿软岩边坡变形复杂,滑坡危险性大,为了有效预防边坡滑坡灾害,提出了一种三维数值模拟和切线角理论相结合的滑坡灾害预防技术。该技术研究过程为基于大尺度三维数值模拟在空间上找到潜在变形体,利用蠕变曲线切线角理论计算,建立... 详细信息

露天煤矿软岩边坡变形复杂,滑坡危险性大,为了有效预防边坡滑坡灾害,提出了一种三维数值模拟和切线角理论相结合的滑坡灾害预防技术。该技术研究过程为基于大尺度三维数值模拟在空间上找到潜在变形体,利用蠕变曲线切线角理论计算,建立了不同类型边坡雷达预警阈值划分标准,并对潜在重点变形区域进行时间尺度的全天候监测。将该技术应用于霍林河煤田二号露天采区边坡的滑坡灾害预防中,取得很好的效果。通过数值模拟技术发现,采区南帮开挖区域附近边坡存在潜在变形体,有滑坡风险;再结合切线角理论计算得到的边坡雷达监测阈值提前发出预警信息,得到的边坡雷达监测变形区域与三维数值模拟得到的潜在变形区域基本一致,成功预警了边坡变形的发生,保障了露天煤矿的安全生产。

关键词：滑坡灾害切线角理论数值模拟边坡雷达预警阈值预警监测露天煤矿

Delphi法构建热带医学本科教育人才培养目标和课程的研究

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中华医学教育探索杂志 2024年第3期23卷 343-346页

作者：吴洁李岩蔡群芳董素芳尹丽芦亚君夏乾峰海南医学院热带医学院海口571199

目的构建热带医学本科教育人才培养目标和课程。方法运用德尔菲法对15名专家进行2轮问卷咨询。用SPSS 26.0软件进行统计学分析,分别计算回收率、专家权威系数、重要性评分均数、满分比、变异系数及肯德尔协调系数。采用肯德尔秩相关检... 详细信息

目的构建热带医学本科教育人才培养目标和课程。方法运用德尔菲法对15名专家进行2轮问卷咨询。用SPSS 26.0软件进行统计学分析,分别计算回收率、专家权威系数、重要性评分均数、满分比、变异系数及肯德尔协调系数。采用肯德尔秩相关检验分析专家协调程度,并用"界值法"筛选指标。结果2轮咨询的有效回收率均为100.00%,专家权威系数为0.815,协调系数分别为0.25、0.32和0.27、0.36,显著性检验P<0.001。最终形成11项热带医学本科教育人才培养目标和7门热带医学课程。结论构建的热带医学本科教育人才培养目标和课程较合理、可靠,可为热带医学人才培养提供理论支持,具有一定指导价值。

关键词：德尔菲法热带医学人才培养课程改革

Ecological sustainability assessment of the carbon footprint in Fujian Province,southeast China

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Frontiers of Earth Science 2021年第1期15卷 12-22页

作者： Jingyu ZENG Rongrong ZHANG Jia TANG Jingchen liANG Jinghan li Yue ZENG Yefan li Qing ZHANG Wei SHUI qianfeng WANG Fujian Provincial Key Laboratory of Remote Sensing of Soil Erosion and Disaster Protection/College of Environment and Resource Fuzhou UniversityFuzhou 350116China Key Laboratory of Spatial Data Mining&Information Sharing(Ministry of Education of China) Fuzhou 350116China Joint Global Change Research Institute Pacific Northwest National Laboratory and University of MarylandCollege ParkMD 20740USA Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijing 100094China College of Geography and Tourism Anhui Normal UniversityWuhu 241000China

China’s rapid economic development has initiated the deterioration of its ecological environment,posing a threat to the sustainable development of human *** a result,an assessment of regional sustainability is *** paper researches China’s most forested province,Fujian Province,as the study *** proposed a grid-based approach to assess the regional carbon footprint in accordance with the Intergovernmental Panel on Climate Change’s(IPCC)carbon emission *** method of assessment also introduced carbon emission indicators with our improved and published Net Primary Production(NPP)based on process *** carbon footprint in Fujian Province from 2005-2017 was calculated and examined from a spatiotemporal *** indicators were used in the sustainability *** research draws the following conclusions:1)the carbon footprint in the eastern regions of Fujian Province was higher due to rapid economic development;2)that of the western regions was lower;3)an uptrend in the carbon footprint of Fujian Province was *** five ecological indicators based on carbon emissions and economic and social data showed an ecologically unsustainable trend over 13 years in the research area due to unsustainable economic ***,it is urgent to balance the relationship between economic development and environmental *** research provides scientific references for achieving ecological civilization and sustainability in a similar region.

关键词： Fujian Province carbon emission carbon footprint ecological index sustainable development

Dendron-polymer hybrid mediated anticancer drug delivery for suppression of mammary cancer

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Journal of Materials Science & Technology 2021年第4期63卷 115-123页

作者： Dayi Pan Xiuli Zheng Miao Chen qianfeng Zhang Zhiqian li Zhenyu Duan Qiyong Gong Zhongwei Gu Hu Zhang Kui Luo Huaxi MR Research Center(HMRRC) Department of RadiologyFunctional and Molecular Imaging Key Laboratory of Sichuan ProvinceNational Clinical Research Center for GeriatricsState Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengdu610041China Department of Orthodontics West China Hospital of StomatologySichuan UniversityChengdu610041SichuanChina Amegen Bioprocessing Centre Keck Graduate InstituteCA91711USA

Dendron-polymer-based nanoscale and stimuli-responsive drug delivery systems have shown great promise in tumor-targeting accumulation without significant *** we report a dendronized polymer-doxorubicin(DOX)hybrid(DPDH)with an improved in vivo drug delivery efficiency for cancer therapy compared with a linear polymer-DOX conjugate(LPDC).The in vitro drug release profile of DOX indicates that DPDH displays pH-responsive drug release due to cleavage of hydrazone bonds since a greater amount of DOX is released at pH 5.2 at a faster rate than at pH *** efficiently enters 4 T1 cells and releases DOX to induce cytotoxicity and *** to the dendronzied structure,DPDH has a significantly longer blood circulation time than *** substantially enhances the therapeutic efficacy to suppress tumor growth in a 4 T1 mammary cancer model than LPDC as well as free drug,evidenced from tumor growth inhibition,TUNEL assessment and histological *** of DPDH is also confirmed from hemolysis,body weight shifts during treatment and pathological *** study demonstrates the use of dendronized polymer-DOX hybrids for specific drug molecules is a promising approach for drug delivery.

关键词： cancer analysis. release

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普通烟草VQ家族基因的鉴定及表达

分子植物育种 2024年第9期22卷 2856-2863页

作者：王东李志远周平蒲文宣毛辉王雪云张新要刘万峰陈前锋李晓旭湖南中烟工业有限责任公司技术中心长沙410007 中国农业科学院烟草研究所烟草行业烟草基因资源利用重点实验室青岛266101 湖北中烟工业有限责任公司技术中心武汉430017 湖南省烟草公司湘西自治州公司吉首416000

VQ家族是一类植物特有的家族,被报道参与生长发育、生物和非生物逆境胁迫响应等过程。本研究利用生物信息学和比较基因组学的方法,在烟草基因组中对VQ家族成员进行鉴定,并进行进化分析、共线性分析、复制分析以及表达模式等分析。本研... 详细信息

VQ家族是一类植物特有的家族,被报道参与生长发育、生物和非生物逆境胁迫响应等过程。本研究利用生物信息学和比较基因组学的方法,在烟草基因组中对VQ家族成员进行鉴定,并进行进化分析、共线性分析、复制分析以及表达模式等分析。本研究从烟草基因组中鉴定出57个VQ家族成员编码基因,其中33个普通烟草VQ基因被锚定到染色体上。系统发育分析发现,普通烟草和拟南芥的VQ家族成员被分成了9个亚家族。共线性分析表明,普通烟草NtVQ23与拟南芥中的AtVQ16形成共线性基因对。同时,对烟草基因组中的复制事件分析表明,全基因组重复事件在VQ家族成员的扩张中发挥着重要作用。此外,还对部分VQ家族成员的表达模式进行了分析,结果表明VQ基因的表达具有组织特异性,NtVQ9、NtVQ26等基因能够被青枯病接种和盐胁迫处理显著诱导。本研究对普通烟草VQ家族成员进行了鉴定与分析,为其后续研究VQ家族成员的功能提供了一定基础。

关键词：烟草 VQ家族生物逆境胁迫非生物逆境胁迫

船用柴油-天然气双燃料发动机活塞熔顶分析与改进

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内燃机 2024年第3期40卷 44-48页

作者：梁和平钱立宏黎金辉汪榆海程前峰玉柴联合动力股份有限公司安徽芜湖241080

在船用柴油-天然气双燃料发动机的开发过程中,铸铝活塞顶面出现了熔顶现象。经过燃烧分析,发现该问题的主要原因在于柴油喷射控制策略导致的爆震裕度不足,以及对试验边界条件的变化过于敏感,造成了缸内温度和活塞顶面温度的异常升高,最... 详细信息

在船用柴油-天然气双燃料发动机的开发过程中,铸铝活塞顶面出现了熔顶现象。经过燃烧分析,发现该问题的主要原因在于柴油喷射控制策略导致的爆震裕度不足,以及对试验边界条件的变化过于敏感,造成了缸内温度和活塞顶面温度的异常升高,最终引起活塞的熔顶。通过优化电控标定、改进活塞内冷油道设计以及进行活塞顶面陶瓷化处理,提升了爆震裕度,活塞顶面温度明显降低,问题得到了有效解决。

关键词：活塞熔顶燃烧分析设计优化电控标定优化