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基于红外图像时域特征的沥青混合料细观裂缝评价研究

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激光与红外 2024年第2期54卷 242-248页

作者：侯德华李忠玉张庆 BuselAV 河南省高远公路养护技术有限公司河南新乡453003 河南省高等级公路检测与养护技术重点实验室河南新乡453003 河南师范大学化学化工学院河南新乡453007 白俄罗斯国立技术大学白俄罗斯明斯克220071

为优化沥青混合料中细观裂缝的快速评价方法与效率,首先通过室内试验设计沥青混合料细观裂缝制备及其评价方法,采用线激光对试件进行扫描并采集红外图像,通过对红外图像数据分析,建立基于时间序列的温度区间特征追踪方法,进而计算温度... 详细信息

为优化沥青混合料中细观裂缝的快速评价方法与效率,首先通过室内试验设计沥青混合料细观裂缝制备及其评价方法,采用线激光对试件进行扫描并采集红外图像,通过对红外图像数据分析,建立基于时间序列的温度区间特征追踪方法,进而计算温度区间特征面积及其扩散速率与线激光位移的热特性变化关系,最后对试件中的细观裂缝位置和宽度进行定量分析。研究表明,基于温度区间热效应的扩散速率,可以增强试件中细观裂缝的空间分辨率,同时随着线激光逐渐靠近裂缝,温度特征面积扩散速率明显表现出先降低后增加的趋势,说明试件裂缝处的热扩散能量逐渐降低并趋近于零,当线激光远离裂缝时,试件表面的热扩散速率又逐渐增加,体现出很强的细观裂缝热阻隔现象。结果表明,在裂缝处温度区间B、C的特征面积始终位处于特征曲线的最低波谷位置,且温度区间B的裂缝定位误差小于5.61%;同时,在可靠度水平为95%条件下,通过亚像素算法计算的裂缝特征面积宽度与裂缝宽度的相关性达到0.9952,预测裂缝宽度的相对误差不大于4.13%。该评价方法显示了基于时序特征的温度区间对不同细观裂缝宽度均具有显著的敏感性,可为车载移动式热成像技术自动化检测沥青路面裂缝的应用提供理论基础和借鉴。

关键词：线激光红外成像温度区间热扩散速率细观裂缝特征

lncRNA UCA1在急性髓系白血病患者中的表达及其临床意义

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中国实验血液学杂志 2024年第4期32卷 999-1004页

作者：白雪伍燕平李忠玉陈晓奉王蒙李佳佳蚌埠医学院第一附属医院血液科安徽蚌埠233003

目的:检测急性髓系白血病(AML)患者骨髓中尿路上皮癌胚抗原1(lncRNA UCA1)的表达水平,并探讨lnc RNA UCA1表达水平在AML患者中的临床意义。方法:收集50例AML患者骨髓标本作为实验组和20例缺铁性贫血(IDA)患者骨髓标本作为对照组,并收集... 详细信息

目的:检测急性髓系白血病(AML)患者骨髓中尿路上皮癌胚抗原1(lncRNA UCA1)的表达水平,并探讨lnc RNA UCA1表达水平在AML患者中的临床意义。方法:收集50例AML患者骨髓标本作为实验组和20例缺铁性贫血(IDA)患者骨髓标本作为对照组,并收集AML患者的相关临床病理特征资料。采用实时荧光定量PCR(q RT-PCR)检测lnc RNA UCA1在实验组和对照组中的表达水平,并分析lnc RNA UCA1在AML患者中的表达水平与临床病理特征及预后的关系。采用Kaplan-Meier曲线分析lnc RNA UCA1表达水平对AML患者总体生存时间(OS)的影响;采用Cox风险回归模型分析影响AML患者预后的因素。结果:与对照组相比,lnc RNA UCA1表达水平在AML患者中明显升高(P0.05);lnc RNA UCA1高表达组患者的OS较低表达组患者显著缩短(P=0.0229)。结论:lnc RNA UCA1表达水平在AML患者中明显上调,其高表达与较差的临床病理特征及不良预后相关,可作为判断AML患者预后的指标和潜在的治疗靶点。

关键词：急性髓系白血病 lncRNA UCA1 预后临床意义

地市农商银行整村授信使用率数据分析——以H农商银行为例

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电脑与电信 2024年第5期 1-5页

作者：黄慧君王波李宇中广西民族大学政治与公共管理学院广西壮族自治区南宁530006 惠州学院计算机科学与工程学院广东惠州516007

在乡村振兴背景下,H农商银行实施“整村授信”,在H市建设农村信用体系、稳定农村金融秩序、支持特色产业振兴发展发挥重要作用。“整村授信”在H农商银行已开展三年,需对“整村授信”使用率研究,以更好回顾与总结。为此,基于H农商银行... 详细信息

在乡村振兴背景下,H农商银行实施“整村授信”,在H市建设农村信用体系、稳定农村金融秩序、支持特色产业振兴发展发挥重要作用。“整村授信”在H农商银行已开展三年,需对“整村授信”使用率研究,以更好回顾与总结。为此,基于H农商银行三年“整村授信”数据研究,首先,统计数据中授信使用率与其影响因素;其次,聚类分析“整村授信”客群分组授信使用率;最后,通过数据挖掘找出授信使用率高置信度关联项。通过授信使用率量化研究,分析成因,为提高授信效率和授信使用率提供数据支撑,以更好推动H农商银行“整村授信”业务发展。

关键词：整村授信农商银行数据统计数据挖掘用信率

Embracing digital mindsets to ensure a sustainable future

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Frontiers of Environmental Science & Engineering 2024年第3期18卷 177-179页

作者： Chengjun li Riqing yu Wenjing Ning Huan zhong Christian Sonne Institute of Environmental Research at Greater Bay Area Guangzhou UniversityGuangzhou 510000China Department of Biology Center for EnvironmentBiodiversity and ConservationThe University of Texas at TylerTylerTX 75701USA School of Environment Nanjing UniversityNanjing 210000China Environmental and life Science Program Trent UniversityPeterboroughOntarioK9H 0A1Canada Faculty of Science and Technology Aarhus UniversityRoskildeDenmark 4000The Kingdom of Denmark Sustainability Cluster School of EngineeringUniversity of Petroleum&Energy StudiesDehradunUttarakhand 248001India

The 19th Asian Games astounded global audiences with an opening spectacle that showcased stunning digital fireworks(International Olympic Committee,2021;Zhe,2023).The groundbreaking display was brought to life through virtual reality(VR)and augmented reality(AR)*** sets a pioneering example to replace conventional fireworks in major international events as well as in other large-scale entertainment activities,marking a historic milestone in the pursuit of a sustainable and healthy future.

关键词： Wildlife Climate Change Heavy metals Noise LAN light pollution

Research on the mechanism of the two-dimensional ultrasonic surface burnishing process to enhance the wear resistance for aluminum alloy

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Friction 2024年第3期12卷 490-509页

作者： Zhen-yu ZHOU Qiu-Yang ZHENG yu li Cong DING Guang-Jian PENG zhong-yu PIAO College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education and Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310014China

The gradient nanostructure is machined on the aluminum(Al)alloy by the two-dimensional ultrasonic surface burnishing process(2D-USBP).The mechanism of why the gradient nanostructure enhances wear resistance is *** mechanical properties and microstructure characterization for the gradient nanostructure are performed by operating a nanoindenter,transmission electron microscopy(TEM),and electron backscattered diffraction(EBSD).Dry wear tests are performed on the samples before and after machining to evaluate the wear resistance and *** effect of the gradient nanostructure on the wear resistance is explored by developing the crystal plasticity(CP)finite element and molecular dynamics(MD)*** characterization results show that the 2D-USBP sample prepared a gradient structure of~600μm thick on the aluminum surface,increasing the surface hardness from 1.13 to 1.71 GPa and reducing the elastic modulus from 78.84 to 70.14 *** optimization of the surface microstructure and the increase of the mechanical properties effectively enhance the wear resistance of the sample,with 41.20%,39.07%,and 54.58% of the wear scar areas for the 2D-USBP treated samples to the original samples under 5,10,and 15 N loads,*** gradient nanostructure hinders the slip of dislocations inside the sample during the wear process and reduces the size and scope of plastic deformation;meanwhile,the resistance to deformation,adhesion,and crack initiation and propagation of the sample surface is improved,resulting in enhanced wear resistance.

关键词： structural superlubricity lattice registry elastic deformation strained solitons crystal plasticity molecular dynamics simulations

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肾胺酶与心房颤动的相关性研究

川北医学院学报 2024年第1期39卷 71-74页

作者：王玉兵帅壮李宗宇邹璐蔚张敏吕湛川北医学院附属医院心血管疾病研究室四川南充637000

目的:探讨肾胺酶在心房颤动(房颤)的发生及发展中的作用。方法:按照房颤与否将208例患者分为房颤组和对照组,每组各104例;按照房颤类型将房颤组分为持续性房颤组(n=68)与阵发性房颤组(n=36)。收集各组受试者的一般资料及静脉血,测定血... 详细信息

目的:探讨肾胺酶在心房颤动(房颤)的发生及发展中的作用。方法:按照房颤与否将208例患者分为房颤组和对照组,每组各104例;按照房颤类型将房颤组分为持续性房颤组(n=68)与阵发性房颤组(n=36)。收集各组受试者的一般资料及静脉血,测定血浆肾胺酶、总儿茶酚胺浓度,比较两组肾胺酶及儿茶酚胺浓度的差异,分析其与房颤之间的相关性。结果:房颤组肾胺酶浓度低于对照组(P0.05)。房颤组与对照组之间及阵发性房颤组和持续性房颤组之间总儿茶酚胺浓度无统计学差异(P>0.05)。房颤组左房内径组大于对照组(P0.05);总儿茶酚胺浓度与心率(r=0.176,P0.05)。二元Logistic回归分析显示,肾胺酶是房颤发生的保护因素(OR<1,P<0.05)。结论:肾胺酶可能参与房颤的发生,并改善心脏重构。

关键词：心律失常心房颤动肾胺酶总儿茶酚胺相关性

Super-high bed sintering for iron ores:behaviors,causes and solutions of horizontal segregation on strand

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Journal of Iron and Steel Research(International) 2024年第7期31卷 1590-1596页

作者： liang-ping Xu Hui-bo liu zhong-lin Dong Qiang zhong yu-chao Zhao Guang-hui li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

Horizontal segregation has been a constraint to the development and application of super-high bed *** eliminate the horizontal segregation of super-high bed sintering,several typical sintering machines were sampled and analyzed,and theoretical calculation was made to compare the bed depth and their differences in different areas within the mixture ***,solutions were proposed and applied to a 265 m^(2) sintering *** results showed that the horizontal seg-regation of the 265 m^(2) sintering machine was dominated by particles larger than 8 mm with horizontal segregation degree of 0.48,while 360 and 550 m^(2) sintering machines were affected by 5-8 mm and 1-3 mm particles with horizontal segregation degree of 0.27 and 0.31,*** analysis indicated the different segregation distribution results from the matching of the bed depth of each area within the mixture ***,the horizontal segregation degree not larger than 0.06 was achieved by optimizing the time parameters and the division of three zones on the 265 m^(2) sintering machine.

关键词： Super-high bed sintering Horizontal segregation Feeder Particle distribution Agglomeration

Predictability of the 7·20 extreme rainstorm in Zhengzhou in stochastic kinetic-energy backscatter ensembles

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Science China Earth Sciences 2024年第7期67卷 2226-2241页

作者： Min YANG Peilong yu lifeng ZHANG Xiaobing PAN Quanjia zhong yunying li College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Key Laboratory of High Impact Weather(Special) China Meteorological AdministrationChangsha 410073China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment ChangeNanjing University of Information Science and TechnologyNanjing 210044China Department of Ocean Science Hong Kong University of Science and TechnologyHong Kong 999077China

The scale-dependent predictability of the devastating 7·20 extreme rainstorm in Zhengzhou,China in 2021 was investigated via ensemble experiments,which were perturbed on different scales using the stochastic kinetic-energy backscatter(SKEB)scheme in the WRF model,with the innermost domain having a 3-km grid *** daily rainfall(RAIN24h)and the cloudburst during 1600-1700 LST(RAIN1h)were *** demonstrated that with larger perturbation scales,the ensemble spread for the rainfall maximum widens and rainfall forecasts become closer to the *** ensembles with mesoscale or convective-scale perturbations,RAIN1h loses predictability at scales smaller than 20 km and RAIN24h is predictable for all *** in ensembles with synoptic-scale perturbations,the largest scale of predictability loss extends to 60 km for both RAIN1h and ***,the average positional error in forecasting the heaviest rainfall for RAIN24h(RAIN1h)was 400 km(50-60)*** southerly low-level jet near Zhengzhou was assumed to be directly responsible for the forecast uncertainty of *** rapid intensification in low-level cyclonic vorticity,mid-level divergence,and upward motion concomitant with the jet dynamically facilitated the *** analysis of the divergent,rotational and vertical kinetic spectra and the corresponding error spectra showed that the error kinetic energy at smaller scales grows faster than that at larger scales and saturates more quickly in all ***-scale perturbations not only boost larger-scale error growth but are also conducive to error growth at all scales through a downscale cascade,which indicates that improving the accuracy of larger-scale flow forecast may discernibly contributes to the forecast of cloudburst intensity and position.

关键词： Stochastic kinetic-energy backscatter(SKEB) Extreme rainfall Ensemble forecast Predictability

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Simultaneously enhancing coercivity and remanence of hot-deformed Nd-Fe-B magnets by flake copper powder assisted DyF_(3) interflake addition

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Journal of Rare Earths 2024年第7期42卷 1282-1288,I0003页

作者： Yikuan Hu Jiajie li Shengyu Sun Shuwei zhong Munan Yang Xiaoqiang yu Sajjad Ur Rehman Xi yu Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices College of Rare EarthsJiangxi University of Science and TechnologyGanzhou341000 National Rare Earth Functional Materials Innovation Center Ganzhou341000China Ganzhou Fortune Electronic Ltd. Ganzhou341000China

It is still a challenge to simultaneously enhance coercivity(H_(cj))and remanence(J_(r))of hot-deformed Nd-Fe-B magnet due to the coercivity-remanence trade-off ***,we achieved this balance between H_(cj)and Jr by flake Cu powder assisted DyF_(3)interflake *** Hcj increases from 1218 to 1496 kA/m and Jr increases from 1.32 to 1.34 T compared with the original *** show that the width of coarse grain layers reduces because of the introduction of flake Cu,which increases the contact areas of the adjacent grains at ribbon interfaces and suppresses the excessive growth of *** stronger degree of texture and higher density compared with the original magnet should take the responsibility for the increase of J_(r).Additionally,the aggregation regions of rare earth rich(RE-rich)phase reduce and the betterment of the microstructure is another reason for the enhancement of Jr in the flake Cu aided DyF_(3)hot-deformed *** strategy of using flake powder additives provides a promising method for optimizing microstructure and enhancing magnetic properties of hot-deformed Nd-Fe-B magnets.

关键词： Rare earths Nd-Fe-B Hot-deformed magnet Flake powder Interflake addition Remanence