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基于OCT高危人群糖尿病筛查方法

激光技术 2024年第3期48卷 312-317页

作者：何松苏亚姚晓天郝鹏崔省伟蔡开明孙金豪河北大学物理科学与技术学院保定071002 河北省光学感知技术创新中心保定071002

为了能够筛查出高危人群中潜在糖尿病患者,使患者得到早期治疗和减少并发症产生,提出了一种基于光学相干层析成像(OCT)的高危人群糖尿病无创筛查方法。首先将3维OCT图像进行区域划分,利用主成分分析法,将众多血糖敏感区域散射系数转变... 详细信息

为了能够筛查出高危人群中潜在糖尿病患者,使患者得到早期治疗和减少并发症产生,提出了一种基于光学相干层析成像(OCT)的高危人群糖尿病无创筛查方法。首先将3维OCT图像进行区域划分,利用主成分分析法,将众多血糖敏感区域散射系数转变为一个综合指标S,进而归一化得到0 min~120 min不同时刻的相对量S i(i=0,1,2…,120);然后将健康、轻度糖尿病、重度糖尿病人群在0 min~120 min不同时刻的血糖归一化经验值;最后通过8例临床对照实验验证了方法的可行性,得到了准确的筛查结果。结果表明,判定阈值1为0.47,阈值2为0.78;将S 120与阈值1、阈值2进行比较,得到0

关键词：医用光学生物技术无创血糖检测光学相干层析成像糖尿病筛查主成分分析

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耗氧型惰化反应器起燃特性

航空学报 2021年第3期42卷 217-224页

作者：冯诗愚任童谢辉辉彭孝天王晨臣王洋洋潘俊南京航空航天大学航空学院飞行器环境控制与生命保障工业和信息化部重点实验室南京210016 航空工业江西洪都航空工业集团有限责任公司南昌330024 中国航空工业集团有限公司南京机电液压工程研究中心航空机电系统综合航空科技重点实验室南京211106

通过CFD方法建立了一个耦合化学反应的多孔介质二维拟均相反应器模型,研究了耗氧型惰化系统在不同工况下反应器的操作范围及工作性能。以RP-3燃油为研究对象,采用Fluent 17.0软件的多孔介质单温度模型,通过UDS(User Defined Scalar)添... 详细信息

通过CFD方法建立了一个耦合化学反应的多孔介质二维拟均相反应器模型,研究了耗氧型惰化系统在不同工况下反应器的操作范围及工作性能。以RP-3燃油为研究对象,采用Fluent 17.0软件的多孔介质单温度模型,通过UDS(User Defined Scalar)添加固相能量方程,采用源项形式添加化学反应热到固相能量方程。研究了不同参数对反应器起燃过程的影响,并给出了起燃过程内反应器催化床温度的变化过程。结果显示:反应器起燃过程中,催化床温度十分不均匀;RP-3摩尔分数的增加可大幅度缩短起燃时间,并且可降低起燃温度;存在一个适宜的气体速度使得反应器能够快速起燃。

关键词：催化燃烧反应器燃油箱惰化系统 RP-3航空煤油

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制冷剂类型对机载蒸发循环系统性能影响

南京航空航天大学学报 2020年第3期52卷 478-484页

作者：彭孝天冯诗愚李超越王晨臣刘卫华南京航空航天大学航空学院飞行器环境控制与生命保障工业和信息化部重点实验室南京210016

为给直升机机载制冷循环系统制冷剂的选择提供借鉴,首先以某直升机现有空调系统为例,依据其系统及部件参数,在VapCyc软件中建立制冷系统模型。然后选用不同制冷剂,改变冷凝器侧入口空气温度、冷凝器/蒸发器侧风量及压缩机转速,得到系统... 详细信息

为给直升机机载制冷循环系统制冷剂的选择提供借鉴,首先以某直升机现有空调系统为例,依据其系统及部件参数,在VapCyc软件中建立制冷系统模型。然后选用不同制冷剂,改变冷凝器侧入口空气温度、冷凝器/蒸发器侧风量及压缩机转速,得到系统制冷系数(Coefficient of performance,COP)及制冷量。分析得到相同工况下,R134a与R1234yf的COP值相差不大且最高,R407C次之,R32与R410A结果相近且COP值最低;制冷量从高到低依次为R32,R410A,R407C,R134a和R1234yf。在机载制冷系统研究初期,应先满足系统制冷量的要求,故认为在选择机载空调制冷剂时,优先考虑R410A及R407C。另外,冷凝器侧风量、蒸发器侧风量及压缩机转速等参数对系统制冷量及COP均有较大影响,设计制冷系统时应慎重确定。

关键词：直升机蒸发循环制冷系统制冷剂 VapCyc

Ionic Liquid Assisted Imprint for Efficient and Stable Quasi-2D Perovskite Solar Cells with Controlled Phase Distribution

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Nano-Micro Letters 2023年第7期15卷 1-15页

作者： Haibin peng Dengxue Li Zongcai Li Zhi Xing xiaotian Hu Ting Hu Yiwang Chen Department of Polymer Materials and Engineering School of Physics and Materials ScienceNanchang University999 Xuefu AvenueNanchang 330031People’s Republic of China College of Chemistry and Chemical Engineering Institute of Polymers and Energy Chemistry(IPEC)Nanchang University999 Xuefu AvenueNanchang 330031People’s Republic of China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of EducationJiangxi Normal University99 Ziyang AvenueNanchang 330022People’s Republic of China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010People’s Republic of China

Although two-dimensional perovskite devices are highly stable,they also lead to a number of *** instance,the introduction of large organic amines makes crystallization process complicated,causing problems such as generally small grain size and blocked charge *** this work,imprint assisted with methylamine acetate were used to improve the morphology of the film,optimize the internal phase distribution,and enhance the charge transfer of the perovskite ***,imprint promoted the dispersion of spacer cations in the recrystallization process with the assistance of methylamine acetate,thus inhibited the formation of low-n phase induced by the aggregation of spacer cations and facilitated the formation of 3D-like *** this case,the corresponding quasi-2D perovskite solar cells delivered improved efficiency and exhibited superior *** work provides an effective strategy to obtain uniform phase distribution for quasi-2D perovskite.

关键词： Imprint Two-dimensional perovskite Phase distribution Charge transfer Stability

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新型环保制冷剂系统性能研究

江苏大学学报（自然科学版） 2019年第5期40卷 547-552页

作者：彭孝天冯诗愚李超越王晨臣刘卫华南京航空航天大学航空学院江苏南京210016 南京航空航天大学飞行器环境控制与生命保障工业和信息化部重点实验室江苏南京210016

为得到制冷系统不同参数以及回热器对新型环保制冷剂R1234yf,R1234ze,R152a,R448A,R290,R600a系统性能的影响,基于VapCyc建立有/无回热器两套仿真模型,并且通过试验验证了模型的正确性.仿真得到了分别选用上述6种制冷剂时,系统制冷量及... 详细信息

为得到制冷系统不同参数以及回热器对新型环保制冷剂R1234yf,R1234ze,R152a,R448A,R290,R600a系统性能的影响,基于VapCyc建立有/无回热器两套仿真模型,并且通过试验验证了模型的正确性.仿真得到了分别选用上述6种制冷剂时,系统制冷量及制冷系数COP随过热度、环境温度、压缩机转速、冷凝器侧风量、蒸发器侧风量的变化规律.结果表明:制冷量随过热度、外界环境温度的升高而减小,随压缩机转速、冷凝器侧风量、蒸发器侧风量的增大而变大;COP随过热度、外界环境温度、冷凝器侧风量的增大而降低;随压缩机转速、蒸发器侧风量的增大而升高;相同工况下,制冷量的大小顺序为R448A,R290,R152a,R1234yf,R1234ze,R600a,COP大小顺序为R600a,R1234ze,R152a,R1234yf,R290,R448A;对于上述6种制冷剂系统,增加回热器对系统性能均是有益的,且系统制冷量及COP平均提高了10%,6%左右,并且对R600a系统性能提高最为有利.

关键词：新型制冷剂回热 VapCyc 制冷量制冷系数

Preparation and Performance of Graphene Oxide Modified Polyurethane Thermal Conductive Insulating Adhesive

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Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 1025-1031页

作者：刘运学 KANG xiaotian FAN Zhaorong GU Yaxin 刘鹏 School of Materials Science and Engineering Shenyang Jianzhu UniversityShenyang110168China

A novel graphene oxide (GO) modified polyurethane thermal conductive insulating adhesive with small addition and excellent insulation properties was prepared by in-situ polymerization using GO as thermal conductive *** effects of GO content on the mechanical performance,thermal conductivity,thermal stability and insulation properties of the modified polyurethane adhesive were *** results showed that the tensile strength and elongation at break of polyurethane adhesive increased at first and then decreased with the increase of GO *** thermal conductivity and thermal decomposition temperature of GO/PU composite adhesive can be effectively improved by adding appropriate amount of *** tensile strength,thermal conductivity and thermal decomposition temperature of polyurethane adhesive reached the maximum when GO content was 1.5 wt%.The novel GO-modified polyurethane adhesive exhibited good insulation *** development of GO/PU thermal conductive adhesive will provide a facile method for effectively solving the “trade-off” problem between low filling and high thermal conductivity.

关键词： graphene oxide polyurethane thermal conductive insulating adhesive performance

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机载电子散热设备气流分布均匀性研究

航空科学技术 2020年第8期31卷 42-47页

作者：范涛峰任童彭孝天冯诗愚南京航空航天大学航空学院飞行器环境控制与生命保障工信部重点实验室江苏南京210016

长流程的散热设备经常会出现流量分配不均匀的问题,导致散热设备各处的冷却效果产生较大差异。利用计算流体力学(CFD)对一个采用孔板送风的机载电子散热设备进行了模拟,分析了不同孔径、开孔数及流量对出口均匀度的影响。结果显示开孔... 详细信息

长流程的散热设备经常会出现流量分配不均匀的问题,导致散热设备各处的冷却效果产生较大差异。利用计算流体力学(CFD)对一个采用孔板送风的机载电子散热设备进行了模拟,分析了不同孔径、开孔数及流量对出口均匀度的影响。结果显示开孔数对均匀度的影响大于孔径,流量改变对均匀度影响不大。对长流程孔板形式出口的散热设备设计具有一定的指导作用。

关键词：机载电子设备均匀度孔板数值模拟

Lateral quantum confinement regulates charge carrier transfer and biexciton interaction in CdSe/CdSeS core/crown nanoplatelets

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Nano Research 2023年第7期16卷 10420-10428页

作者： Yige Yao xiaotian Bao Yunke Zhu Xinyu Sui An Hu peng Bai Shufeng Wang Hong Yang Xinfeng Liu Yunan Gao State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Frontiers Science Center for Nano-optoelectronics Beijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Dalian National Laboratory for Clean Energy Dalian 116023China

Charge carrier dynamics essentially determines the performance of various optoelectronic applications of colloidal semiconductor *** them,two-dimensional nanoplatelets provide new adjustment freedom for their unique core/crown ***,we demonstrate that by fine-tuning the core size and the lateral quantum confinement,the charge carrier transfer rate from the crown to the core can be varied by one order of magnitude in CdSe/CdSeS core/alloy-crown *** addition,the transfer can be affected by a carrier blocking mechanism,i.e.,the filled carriers hinder further possible ***,we found that the biexciton interaction is oppositely affected by quantum confinement and electron delocalization,resulting in a non-monotonic variation of the biexciton binding energy with the emission *** work provides new observations and insights into the charge carrier transfer dynamics and exciton interactions in colloidal nanoplatelets and will promote their further applications in lasing,display,sensing,etc.

关键词： nanoplatelets core/crown charge carrier transfer ultrafast spectroscopy biexciton

Towards Friction Stir Remanufacturing of High‑Strength Aluminum Components

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 91-102页

作者： Xiangchen Meng Yuming Xie xiaotian Ma Mingyang Liang Xiaoyang peng Shiwei Han Lei Kan Xin Wang Sihao Chen Yongxian Huang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Chongqing Tiema Industries Group Co. Ltd.Chongqing 630050China The Sixth Military Representative Ofce of the Army Installment Station in Chongqing Chongqing 400042China Shanghai Spacefight Precision Machinery Institute Shanghai 201600China

Volumetric defects in high-strength aluminum alloy components were repaired via friction stir remanufacturing(FSR).Various consumable pins made of AA7075-T6 were *** diameters of the consumable pins afected material fow,which ensured that the materials at the repairing interface were forged to metallurgical *** angles determined load transfer besides material fow,which afected the fracture of the pins before the dwelling *** repaired components were achieved when the conical angle of the consumable pin was 1°larger than that of the volumetric *** ultimate tensile strength and elongation of the repaired components reached 445.9 MPa and 9.6%,*** design criteria of the consumable pin in the FSR was established,which provided valuable references to repair volumetric defects in high-strength aluminum components.

关键词： Aluminum alloy Defects Friction stir welding Interfaces Microstructures Mechanical properties