为提升煤场的管理水平,并保证不同环境下的盘煤精度,研究Unity3D在工业煤场三维可视化中的关键技术。该技术的数据采集模块利用激光扫描仪采集工业煤场的点云数据,并通过基于面片的多视角立体视觉(PMVS)算法重建该数据;随后将该数据输...为提升煤场的管理水平,并保证不同环境下的盘煤精度,研究Unity3D在工业煤场三维可视化中的关键技术。该技术的数据采集模块利用激光扫描仪采集工业煤场的点云数据,并通过基于面片的多视角立体视觉(PMVS)算法重建该数据;随后将该数据输入至三维场景构建模块,该模块利用Dynamo for Revit软件生成煤场的三维场景模型。场景渲染和可视化模块在Unity3D技术的支撑下渲染该模型,并完成模型可视化展示;结合构建的模型结果和点云数据完成煤场各区域煤堆的体积计算,实现煤场盘点。测试结果显示,该技术生成的三维场景模型能完整保留煤堆的形态细节,且能可靠完成不同高度煤堆的体积计算。展开更多
The hybridization gap in strained-layer InAs/In_(x)Ga_(1−x) Sb quantum spin Hall insulators(QSHIs)is significantly enhanced compared to binary InAs/GaSb QSHI structures,where the typical indium composition,x,ranges be...The hybridization gap in strained-layer InAs/In_(x)Ga_(1−x) Sb quantum spin Hall insulators(QSHIs)is significantly enhanced compared to binary InAs/GaSb QSHI structures,where the typical indium composition,x,ranges between 0.2 and 0.4.This enhancement prompts a critical question:to what extent can quantum wells(QWs)be strained while still preserving the fundamental QSHI phase?In this study,we demonstrate the controlled molecular beam epitaxial growth of highly strained-layer QWs with an indium composition of x=0.5.These structures possess a substantial compressive strain within the In_(0.5)Ga_(0.5)Sb QW.Detailed crystal structure analyses confirm the exceptional quality of the resulting epitaxial films,indicating coherent lattice structures and the absence of visible dislocations.Transport measurements further reveal that the QSHI phase in InAs/In_(0.5)Ga_(0.5)Sb QWs is robust and protected by time-reversal symmetry.Notably,the edge states in these systems exhibit giant magnetoresistance when subjected to a modest perpendicular magnetic field.This behavior is in agreement with the𝑍2 topological property predicted by the Bernevig–Hughes–Zhang model,confirming the preservation of topologically protected edge transport in the presence of enhanced bulk strain.展开更多
目的分析新生儿脐动脉血气指标与阿普加(Apgar)评分的相关性。方法选取294例新生儿作为研究对象,根据出生1 min Apgar评分不同分为研究组(Apgar评分≤7分,22例)、对照组(Apgar评分8~10分,272例)。比较两组出生1 min Apgar评分、脐动脉...目的分析新生儿脐动脉血气指标与阿普加(Apgar)评分的相关性。方法选取294例新生儿作为研究对象,根据出生1 min Apgar评分不同分为研究组(Apgar评分≤7分,22例)、对照组(Apgar评分8~10分,272例)。比较两组出生1 min Apgar评分、脐动脉血气指标[pH值、血乳酸(Lac)、剩余碱(BE)],采用Pearson相关性分析法分析脐动脉血气指标与Apgar评分的相关性。结果研究组出生1 min Apgar评分(5.78±0.39)分、pH值(7.18±0.16)、BE(-10.14±1.13)mmol/L低于对照组的(8.59±0.41)分、(7.26±0.02)、(-3.24±1.02)mmol/L,Lac(8.46±1.14)mmol/L高于对照组的(5.02±0.21)mmol/L(P<0.05)。Pearson相关性分析结果显示,pH值、BE与出生1 min Apgar评分呈正相关(r=0.607、0.626,P<0.05);Lac与出生1 min Apgar评分呈负相关(r=-0.780,P<0.05)。结论相较于出生1 min Apgar评分8~10分的新生儿,Apgar评分≤7分的新生儿pH值、BE更低,Lac更高,新生儿脐动脉血气指标(pH值、BE、Lac)与Apgar评分关系密切,将脐动脉血气指标与Apgar评分同时应用可为后续开展临床诊疗新生儿窒息工作提供参考。展开更多
A partition of unity finite element method for numerical simulation of short wave propagation in solids is presented. The finite element spaces were constructed by multiplying the standard isoparametric finite element...A partition of unity finite element method for numerical simulation of short wave propagation in solids is presented. The finite element spaces were constructed by multiplying the standard isoparametric finite element shape functions, which form a partition of unity, with the local subspaces defined on the corresponding shape functions, which include a priori knowledge about the wave motion equation in trial spaces and approximately reproduce the highly oscillatory properties within a single element. Numerical examples demonstrate the performance of the proposed partition of unity finite element in both computational accuracy and efficiency.展开更多
文摘为提升煤场的管理水平,并保证不同环境下的盘煤精度,研究Unity3D在工业煤场三维可视化中的关键技术。该技术的数据采集模块利用激光扫描仪采集工业煤场的点云数据,并通过基于面片的多视角立体视觉(PMVS)算法重建该数据;随后将该数据输入至三维场景构建模块,该模块利用Dynamo for Revit软件生成煤场的三维场景模型。场景渲染和可视化模块在Unity3D技术的支撑下渲染该模型,并完成模型可视化展示;结合构建的模型结果和点云数据完成煤场各区域煤堆的体积计算,实现煤场盘点。测试结果显示,该技术生成的三维场景模型能完整保留煤堆的形态细节,且能可靠完成不同高度煤堆的体积计算。
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos.XDB28000000 and XDB0460000)the Quantum Science and Technology-National Science and Technology Major Project (Grant No.2021ZD0302600)the National Key Research and Development Program of China(Grant No.2024YFA1409002)。
文摘The hybridization gap in strained-layer InAs/In_(x)Ga_(1−x) Sb quantum spin Hall insulators(QSHIs)is significantly enhanced compared to binary InAs/GaSb QSHI structures,where the typical indium composition,x,ranges between 0.2 and 0.4.This enhancement prompts a critical question:to what extent can quantum wells(QWs)be strained while still preserving the fundamental QSHI phase?In this study,we demonstrate the controlled molecular beam epitaxial growth of highly strained-layer QWs with an indium composition of x=0.5.These structures possess a substantial compressive strain within the In_(0.5)Ga_(0.5)Sb QW.Detailed crystal structure analyses confirm the exceptional quality of the resulting epitaxial films,indicating coherent lattice structures and the absence of visible dislocations.Transport measurements further reveal that the QSHI phase in InAs/In_(0.5)Ga_(0.5)Sb QWs is robust and protected by time-reversal symmetry.Notably,the edge states in these systems exhibit giant magnetoresistance when subjected to a modest perpendicular magnetic field.This behavior is in agreement with the𝑍2 topological property predicted by the Bernevig–Hughes–Zhang model,confirming the preservation of topologically protected edge transport in the presence of enhanced bulk strain.
文摘目的分析新生儿脐动脉血气指标与阿普加(Apgar)评分的相关性。方法选取294例新生儿作为研究对象,根据出生1 min Apgar评分不同分为研究组(Apgar评分≤7分,22例)、对照组(Apgar评分8~10分,272例)。比较两组出生1 min Apgar评分、脐动脉血气指标[pH值、血乳酸(Lac)、剩余碱(BE)],采用Pearson相关性分析法分析脐动脉血气指标与Apgar评分的相关性。结果研究组出生1 min Apgar评分(5.78±0.39)分、pH值(7.18±0.16)、BE(-10.14±1.13)mmol/L低于对照组的(8.59±0.41)分、(7.26±0.02)、(-3.24±1.02)mmol/L,Lac(8.46±1.14)mmol/L高于对照组的(5.02±0.21)mmol/L(P<0.05)。Pearson相关性分析结果显示,pH值、BE与出生1 min Apgar评分呈正相关(r=0.607、0.626,P<0.05);Lac与出生1 min Apgar评分呈负相关(r=-0.780,P<0.05)。结论相较于出生1 min Apgar评分8~10分的新生儿,Apgar评分≤7分的新生儿pH值、BE更低,Lac更高,新生儿脐动脉血气指标(pH值、BE、Lac)与Apgar评分关系密切,将脐动脉血气指标与Apgar评分同时应用可为后续开展临床诊疗新生儿窒息工作提供参考。
基金Project supported by the National Basic Research Program of China (973Project) (No.2002CB412709) and the National Natural Science Foundation of China (Nos.50278012,10272027,19832010)
文摘A partition of unity finite element method for numerical simulation of short wave propagation in solids is presented. The finite element spaces were constructed by multiplying the standard isoparametric finite element shape functions, which form a partition of unity, with the local subspaces defined on the corresponding shape functions, which include a priori knowledge about the wave motion equation in trial spaces and approximately reproduce the highly oscillatory properties within a single element. Numerical examples demonstrate the performance of the proposed partition of unity finite element in both computational accuracy and efficiency.
