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Intrinsically stretchable polymer semiconductor based electronic skin for multiple perceptions of force,temperature,and visible light

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Nano Research 2023年第1期16卷 1196-1204页

作者： Dongjuan Liu Pengcheng Zhu Fukang Zhang Peishuo Li Wenhao Huang Chang Li Ningning Han Shuairong Mu Hao Zhou Yanchao Mao Key Laboratory of Materials Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China

As a stretchable seamless device,electronic skin(E-skin)has drawn enormous interest due to its skin-like sensing capability.Besides the basic perception of force and temperature,multiple perception that is beyond existing functions of human skin is becoming an important direction for E-skin developments.However,the present E-skins for multiple perceptions mainly rely on different sensing materials and heterogeneous integration,resulting in a complex device structure.Additionally,their stretchability is usually achieved by the complicated microstructure design of rigid materials.Here,we report an intrinsically stretchable polymer semiconductor based E-skin with a simple structure for multiple perceptions of force,temperature,and visible light.The E-skin is on the basis of poly(3-hexylthiophene)(P3HT)nanofibers percolated polydimethylsiloxane(PDMS)composite polymer semiconductor,which is fabricated by a facile solution method.The E-skin shows reliable sensing capabilities when it is used to perceive strain,pressure,temperature,and visible light.Based on the E-skin,an intelligent robotic hand sensing and controlling system is further demonstrated.Compared with conventional E-skins for multiple perceptions,this E-skin only has a simple monolayer sensing membrane without the need of combining different sensing materials,heterogeneous integration,and complicated microstructure design.Such a strategy of utilizing intrinsically stretchable polymer semiconductor to create simple structured E-skin for multiple perceptions will promote the development of E-skins in a broad application scenario,such as artificial robotic skins,virtual reality,intelligent gloves,and biointegrated electronics.

关键词： electronic skin stretchable polymer semiconductor multiple perception visible light artificial robotic skin

Numerical Investigation of the Effects of Rate-Shaped Main Injection on Combustion and Emission in an OPOC Two-Stroke Diesel Engine

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Journal of Beijing Institute of Technology 2019年第2期28卷 226-233页

作者： Lei zhang Tiexiong Su Yunpeng Feng fukang Ma Yangang zhang Jun Wang College of Mechatronic Engineering North University of ChinaTaiyuan 030051China School of Energy and Power Engineering North University of ChinaTaiyuan 030051China Beijing Special Vehicle Institute Beijing 100072China

The effects of various split injection strategies on the opposed-piston opposed-cylinder(OPOC)diesel engine combustion and emission characteristics have been studied numerically using AVL-Fire CFD tools.The five rate-shaped main injections were used in split injection strategies.The results show that ignition delay from a rectangular injection rate is the shortest.Maximum pressure of the trapezoid injection rate is the largest.And the NOx emission of the rectangular injection rate is the largest.Meanwhile,the soot emission of the trapezoid injection rate is the least among the five injection rates.

关键词： opposed-piston opposed-cylinder(OPOC)diesel engine split injection rated-shape main injection:numerical simulation combustion emissions

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剪切流下潮流能水平轴水轮机的水动力分析

哈尔滨工程大学学报 2023年第6期44卷 926-931,968页

作者：张富康盛其虎哈尔滨工程大学船舶工程学院黑龙江哈尔滨150001 中国船舶集团有限公司第七二五研究所厦门双瑞风电科技有限公司福建厦门361100

为研究剪切流下潮流能水平轴水轮机的水动力问题,本文采用叶素动量理论与动态入流模型相结合的方法,考虑相对入流速度的时域变化,计算了不同剪切率下水轮机的各水动力系数,探究了剪切率对潮流能水平轴水轮机的水动力载荷特性的影响规律... 详细信息

为研究剪切流下潮流能水平轴水轮机的水动力问题,本文采用叶素动量理论与动态入流模型相结合的方法,考虑相对入流速度的时域变化,计算了不同剪切率下水轮机的各水动力系数,探究了剪切率对潮流能水平轴水轮机的水动力载荷特性的影响规律。经验证,数值模型与CFD模拟结果吻合良好。结果表明:一定范围内,同一速比下,剪切率对时均轴向力系数的影响不明显,对时均功率系数的影响大约以最优速比为分界,高速比时剪切率越大,功率系数越大,低速比时关系不明显;水动力系数的波动周期与叶轮旋转周期存在倍数关系;水动力系数的幅值与剪切率呈近似线性关系。本文可为剪切流下潮流能水平轴水轮机的载荷分析、设计优化提供有效的预报。

关键词：水平轴水轮机剪切流叶素动量理论水动力特性潮流能动态入流理论剪切率速比

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基于多粒度信息融合的无监督行人重识别方法

计算机工程与应用 2023年第13期59卷 99-109页

作者：温静张福康山西大学计算机与信息技术学院太原030006

现有的无监督行人重识别算法通过残差网络仅能提取粗略的全局特征,但是随着数据集中行人、姿态数目和背景复杂性的激增,这些特征表明行人不同姿态的能力不足,使得模型出现欠拟合,进而导致识别精度下降。基于对上述问题的分析,从空间域... 详细信息

现有的无监督行人重识别算法通过残差网络仅能提取粗略的全局特征,但是随着数据集中行人、姿态数目和背景复杂性的激增,这些特征表明行人不同姿态的能力不足,使得模型出现欠拟合,进而导致识别精度下降。基于对上述问题的分析,从空间域和通道域两方面考虑,设计了一种全新的多粒度信息融合的残差块(multi-granularity information fusion residual block,MgIFR block),替换残差网络中常规的残差模块,并以此提出了一种基于多粒度信息融合的无监督行人重识别方法。MgIFR模块在空间域上借鉴自注意力机制的思想,通过卷积提取粗粒度的全局特征;结合这些全局特征和图像中特定像素处编码的query,得到具有像素级上下文信息的细粒度全局特征,将具有粗粒度和细粒度的两种全局特征相结合,得到行人姿态的显著性特征;在通道域上,利用通道注意力机制,对输入的残差特征和跨层特征进行通道加权融合,最终得到具有多粒度信息融合的特征,以此来提高模型应对不同行人姿态的能力。实验结果表明,在现有公开数据集中,特别是行人数目姿态多和背景更加复杂的数据集上,相较于基线模型,Rank-1最高提升了9个百分点,mAP最高提升了10.7个百分点。提出的MgIFR模块具有更好的行人姿态的区分能力,有效解决了行人的不同姿态导致误判的问题,提高了行人重识别的准确率。

关键词：行人重识别多粒度残差块自注意力机制上下文信息特征融合无监督方法

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基于熵权综合污染指数法的汾河中游水质分析

人民黄河 2022年第5期44卷 109-114,120页

作者：张富康冯民权西安理工大学西北旱区生态水利国家重点实验室陕西西安710048

为改善汾河水体环境,合理制定水环境管理方案,根据2015—2019年汾河中游干流水质监测结果,以单因子污染指数法为基础,引入熵权法对水质指标进行赋权,建立了基于熵权的综合污染指数法,结合单因子污染指数法、聚类分析法及主成分分析法等... 详细信息

为改善汾河水体环境,合理制定水环境管理方案,根据2015—2019年汾河中游干流水质监测结果,以单因子污染指数法为基础,引入熵权法对水质指标进行赋权,建立了基于熵权的综合污染指数法,结合单因子污染指数法、聚类分析法及主成分分析法等对汾河中游干流水质时空变化特征进行分析,辨识主要污染因子。结果表明:在时间上,汾河中游水质具有波动性,基于熵权的综合污染指数从2015年的4.14下降至2019年的2.35,表明水质整体呈好转趋势;在空间上,具有明显的空间差异,水质监测断面可分为3类,太原段水质优于晋中段,自上游至下游基于熵权的综合污染指数呈先增大后减小的变化趋势;汾河中游水环境污染状况虽逐年好转,但水质仍为劣Ⅴ类,其主要污染因子为氨氮、TN。

关键词：熵权综合污染指数法水质时空变化汾河中游

Construction of Photoresponsive 3D Structures Based on Triphenylethylene Photochromic Building Blocks

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Research 2022年第4期2022卷 87-96页

作者： Xiayu zhang fukang Liu Beibei Du Rongjuan Huang Simin zhang Yunfei He Hailan Wang Jingjing Cui Biao zhang Tao Yu Wei Huang Frontiers Science Center for Flexible Electronics Shaanxi Institute of Flexible Electronics Shaanxi Institute of Biomedical Materials and EngineeringNorthwestern Polytechnical University127 West Youyi RoadXi'an 710072China Key Laboratory of Flexible Electronics e Institute of Advanced Materials Nanjing Tech University30 South Puzhu RoadNanjing211816China State Key Laboratory of Organic Electronics and Information Displays e Institute of Advanced Materials(IAM) Nanjing University of Posts Telecommunications9 Wenyuan RoadNanjing 210023China

Photoresponsive materials have been widely used in sensing,bioimaging,molecular switches,information storage,and encryption nowadays.Although a large amount of photoresponsive materials have been reported,the construction of these smart materials into precisely prescribed complex 3D geometries is rarely studied.Here we designed a novel photoresponsive material methyl methacrylate containing triphenylethylene(TrPEF_(2)-MA)that can be directly used for digital light processing(DLP)3D printing.Based on TrPEF_(2)-MA,a series of photoresponsive 3D structures with reversible color switching under ultraviolet/visible light irradiations were fabricated.These complex photoresponsive 3D structures show high resolutions(50μm),excellent repeatability(25 cycles without fatigue),and tunable saturate color degrees.Multicomponent DLP 3D printing processes were also carried out to demonstrate their great properties in information hiding and information-carrying properties.This design strategy for constructing photoresponsive 3D structures is attractive in the area of adaptive camouflage,information hiding,information storage,and flexible electronics.

关键词： properties prescribed attractive

Irreversible electroporation treatment of pheochromocytoma at a complex site: A case report

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Journal of Interventional Medicine 2020年第2期3卷 101-105页

作者： Zhiyuan Wu Tingwei Su fukang Sun Fujun zhang Zhongmin Wang Wei Huang Qin Liu Xiaoyi Ding Department of Interventional Radiology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina

A 24-year-old man was seen 2 years prior for hematuria,hypertension(165/120 mmHg),and palpitations.The plasma normetanephrine(NMN)level was elevated(9812.4 pg/mL).Computed tomography(CT)showed bilateral adrenal tumors(Fig.1).Of the two tumors on the left adrenal gland,the lesion on the head aspect was relatively large,while that on the feet aspect(arrow)was relatively small and adjacent to the left renal artery.There was one lesion on the right adrenal gland.Positron emission tomography(PET)-CT showed increased radioactive tracer uptake in the regions of the bilateral adrenal tumors(Fig.2).The clinical diagnosis was pheochromocytoma.

关键词： adrenal diagnosis elevated

基于自适应神经网络的多模式小失效概率分析方法

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机械工程学报 2022年第23期58卷 39-50页

作者：王攀辛富康邓亚权张浩西北工业大学力学与土木建筑学院西安710129 中航通飞华南飞机工业有限公司珠海519030

针对水陆两栖飞机的襟翼运动机构小失效概率可靠性分析问题,首先通过开展气动载荷模拟分析得到注水灭火典型剖面的载荷历程曲线,并将其简化加载于襟翼运动机构模型中进行仿真分析。然后考虑摩擦系数、装配位置等因素的随机不确定性,建... 详细信息

针对水陆两栖飞机的襟翼运动机构小失效概率可靠性分析问题,首先通过开展气动载荷模拟分析得到注水灭火典型剖面的载荷历程曲线,并将其简化加载于襟翼运动机构模型中进行仿真分析。然后考虑摩擦系数、装配位置等因素的随机不确定性,建立了具有襟翼机构卡滞和运动精度不足两种失效模式的可靠性模型。为了提升分析效率,建立了一种基于自适应神经网络的可靠性分析方法。通过引入超球抽样使得样本点在整个标准正态空间内均匀分布,利用最优超球面将样本空间进行划分,大大缩减了样本空间。同时提出了一种新的学习函数来避免对不重要的区域进行探索,以找到最佳训练点进行模型更新。最后通过数值算例验证算法的计算效率和精度,进而实现了水陆两栖飞机襟翼运动机构可靠性的高效高精度分析。

关键词：襟翼运动机构可靠性超球抽样神经网络

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新型组合近场声全息技术

哈尔滨工程大学学报 2022年第2期43卷 228-234,254页

作者：张子鑫肖友洪魏富康哈尔滨工程大学动力与能源工程学院黑龙江哈尔滨150001

近场声全息技术是一种有效的声场可视化技术,当场点声压测量数较少时,该技术重建复杂声场存在重建精度不高的问题。针对此问题,本文提出了一种新型组合近场声全息技术,通过统计最优近场声全息实现全息面声压的数据外推,外推后的声压作... 详细信息

近场声全息技术是一种有效的声场可视化技术,当场点声压测量数较少时,该技术重建复杂声场存在重建精度不高的问题。针对此问题,本文提出了一种新型组合近场声全息技术,通过统计最优近场声全息实现全息面声压的数据外推,外推后的声压作为声场重建的输入,采用边界元法和压缩感知相结合技术,重建较少场点条件下复杂声场。针对矩形板开展了仿真与实验验证研究,结果表明:在测量场点较少时,采用组合近场声全息技术可有效提高重建精度,沿x、y方向分别外推2个阵元间距,即可获得较好的重建结果,分析频段内的平均重建误差降低了20.8%,验证了算法的有效性。

关键词：少场点测量重建精度数据外推统计最优近场声全息边界元法压缩感知组合近场声全息