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铁酸铋薄膜柔性化微纳制造及铁电性能

半导体技术 2024年第2期49卷 138-142页

作者：乔骁骏李雅青丑修建中北大学半导体与物理学院太原030051

研究了铁酸铋薄膜的柔性化可控制造方法及其电畴调控动态。利用脉冲激光沉积法制备了周期性畴结构的铁酸铋薄膜,结合可控剥离技术,完成了铁酸铋薄膜从刚性基底到柔性基底的制备过程。利用原子力显微镜和压电力显微镜技术对柔性化铁酸铋... 详细信息

研究了铁酸铋薄膜的柔性化可控制造方法及其电畴调控动态。利用脉冲激光沉积法制备了周期性畴结构的铁酸铋薄膜,结合可控剥离技术,完成了铁酸铋薄膜从刚性基底到柔性基底的制备过程。利用原子力显微镜和压电力显微镜技术对柔性化铁酸铋薄膜的微观形貌和铁电特性进行表征。结果表明,柔性化后的铁酸铋薄膜保持完整的表面形貌特征(粗糙度保持不变),电畴反转特性保持可调,且保持良好的铁电特性及电畴反转响应。该研究为铁酸铋薄膜的柔性化制备提供了一种新思路。

关键词：铁电薄膜柔性铁酸铋极化电畴反转

Dynamic ensemble selection of convolutional neural networks and its application in flower classification

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International Journal of Agricultural and Biological Engineering 2022年第1期15卷 216-223页

作者： Zhibin Wang Kaiyi Wang Xiaofeng Wang Shouhui Pan xiaojun qiao Information Technology Research Center Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China National Engineering Research Center for Information Technology in Agriculture Beijing 100097China

In recent years,convolutional neural networks(CNNs)have achieved great success in image ***,CNN models usually have complex network structures that tend to cause some related problems,such as redundancy of network parameters,low training efficiency,overfitting,and weak generalization *** solve these problems and improve the accuracy of flower classification,the advantages of CNNs were combined with those of ensemble learning and a method was developed for the dynamic ensemble selection of ***,MobileNet models pre-trained on a public dataset were transferred to flower datasets to train thirteen different MobileNet classifiers,and a resampling strategy was used to enhance the diversity of individual ***,the thirteen classifiers were sorted by a classifier sorting algorithm,before ensemble selection,to avoid an exhaustive ***,with the credibility of recognition results,a classifier subset was dynamically selected and integrated to identify the flower species from their *** verify the effectiveness,the proposed method was used to classify the images of five flower *** accuracy of the proposed method was 95.50%,an improvement of 1.62%,3.94%,22.04%,13.77%,and 0.44%,over those of MobileNet,Inception-v1,ResNet-50,Inception-ResNet-v2,and the linear ensemble method,*** addition,the performance of the proposed method was compared with five other methods for flower *** experimental results demonstrated the accuracy and robustness of the proposed method.

关键词： flowers classification convolutional neural network dynamic ensemble selection

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基于物联网的病虫害绿色防控系统研发与应用

中国农业科技导报 2024年第4期26卷 77-86页

作者：丁亚会陈诚乔晓军沈剑波林森张云鹤冯思思国家农业智能装备工程技术研究中心北京100097 北京市农林科学院智能装备技术研究中心北京100097 国家农业信息化工程技术研究中心北京100097 北京市农林科学院信息技术研究中心北京100097

为减少农药施用量、发展病虫害绿色防控技术,保障农产品质量安全,基于物联网技术,结合臭氧灭菌防病、光源诱导除虫、作物健康识别和病虫害辨识预警等技术,研发了设施蔬菜病虫害绿色防控系统,主要由多功能植保机和信息管理系统组成。结... 详细信息

为减少农药施用量、发展病虫害绿色防控技术,保障农产品质量安全,基于物联网技术,结合臭氧灭菌防病、光源诱导除虫、作物健康识别和病虫害辨识预警等技术,研发了设施蔬菜病虫害绿色防控系统,主要由多功能植保机和信息管理系统组成。结果表明,绿色防控系统下草莓白粉病发病率较常规施药法降低27.7%,草莓产量提高19.8%,具有显著的草莓白粉病防控效果和增产潜力。同时,系统的预警服务、多方式消杀、远程控制和智能托管等功能有效缓解了我国植保技术装备落后、过度依赖农药使用、劳动力结构性短缺和维保运营困难等问题。系统的应用在一定程度上实现了设施蔬菜病虫害防治的绿色化、专业化和智能化。

关键词：绿色防控系统植保机物联网云托管病虫害

基于可控剥离技术的柔性反铁电薄膜固态制冷技术

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微纳电子技术 2024年第2期61卷 54-61页

作者：乔骁骏王静慧李雅青耿文平中北大学半导体与物理学院太原030051 中北大学仪器科学与动态测试教育部重点实验室太原030051 马来西亚北方大学国际教育学院吉打州06010

反铁电薄膜具有强大的偶极子动力学可调特性,在储能电容器和固态制冷领域表现出巨大的潜力,因此有必要对柔性反铁电薄膜的固态制冷进行研究。采用溶胶-凝胶技术在蓝宝石衬底上制备了Pb_(0.97)La_(0.02)Zr_(0.95)Ti_(0.05)O_(3)(PLZT)薄... 详细信息

反铁电薄膜具有强大的偶极子动力学可调特性,在储能电容器和固态制冷领域表现出巨大的潜力,因此有必要对柔性反铁电薄膜的固态制冷进行研究。采用溶胶-凝胶技术在蓝宝石衬底上制备了Pb_(0.97)La_(0.02)Zr_(0.95)Ti_(0.05)O_(3)(PLZT)薄膜,并通过可控剥离技术将其柔性化。柔性反铁电薄膜的极化特性在不同的外加偏压下表现出典型的滞回特性,并在外加电场驱动下表现出巨大的负电卡响应。结果表明,柔性反铁电薄膜室温下绝热温度变化为-6.9 K,在450 kV/cm的电场强度下,205 K时获得了-9.5 K的最大绝热温度变化。本研究为可穿戴柔性设备和场景的固态制冷提供可行性,同时为其他功能薄膜的柔性集成制造提供了技术基础。

关键词：反铁电薄膜柔性材料 Pb_(0.97)La_(0.02)Zr_(0.95)Ti_(0.05)O_(3)(PLZT) 储能电容器固态制冷柔性集成制造

Synergistic piezoelectricity enhanced BaTiO_(3)/polyacrylonitrile elastomer-based highly sensitive pressure sensor for intelligent sensing and posture recognition applications

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Nano Research 2023年第4期16卷 5490-5502页

作者： Junbin Yu Shuai Xian Zhenpeng Zhang Xiaojuan Hou Jian He Jiliang Mu Wenping Geng xiaojun qiao Le Zhang Xiujian Chou Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China

Designing stretchable and skin-conformal self-powered sensors for intelligent sensing and posture recognition is ***,based on a multi-force mixing and vulcanization process,as well as synergistically piezoelectricity of BaTiO_(3)and polyacrylonitrile,an all-in-one,stretchable,and self-powered elastomer-based piezo-pressure sensor(ASPS)with high sensitivity is *** ASPS presents excellent sensitivity(0.93 V/104 Pa of voltage and 4.92 nA/104 Pa of current at a pressure of 10-200 kPa)and high durability(over 10,000 cycles).Moreover,the ASPS exhibits a wide measurement range,good linearity,rapid response time,and stable frequency *** components were fabricated using silicone,affording satisfactory skinconformality for sensing *** cooperation with a homemade circuit and artificial intelligence algorithm,an information processing strategy was proposed to realize intelligent sensing and *** home-made circuit achieves the acquisition and wireless transmission of ASPS signals(transmission distance up to 50 m),and the algorithm realizes the classification and identification of ASPS signals(accuracy up to 99.5%).This study proposes not only a novel fabrication method for developing self-powered sensors,but also a new information processing strategy for intelligent sensing and recognition,which offers significant application potential in human-machine interaction,physiological analysis,and medical research.

关键词： flexible pressure sensor synergistic piezoelectricity all-in-one structure high sensitivity intelligent sensing and recognition

Stretchable and skin-conformal piezo-triboelectric pressure sensor for human joint bending motion monitoring

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Journal of Materiomics 2022年第2期8卷 247-256页

作者： Junbin Yu Liang Chen Xiaojuan Hou Jiliang Mu Jian He Wenping Geng xiaojun qiao Xiujian Chou Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan030051China

Stretchable,skin-conformal,and self-powered wearable pressure sensors have garnered significant attention for use in human joint bending motion ***,a piezo-triboelectric pressure sensor(P-TPS)based on triboelectric nanogenerator and piezoelectric nanogenerator is *** P-TPS can generate an enhanced electrical output by coupling the dual-mode triboelectrification and piezoelectric *** P-TPS shows high sensitivity(voltage=0.3 V/kPa;current=4.3 nA/kPa;pres-sure range=0-200 kPa),high linearity,and good ***,it demonstrates a wide mea-surement range(0-800 kPa),table frequency response,and fast response ***,all components of the P-TPS are fabricated using flexible and stretchable materials,affording satisfactory stretchability and excellent skin *** to their ability to self-power,they can be attached to the outside of joints to monitor human joint bending movements in real ***,this study provides a novel method of using a stretchable and skin-conformal piezo-triboelectric nanogenerator with high electrical performance as a self-powered pressure sensor,which offers significant potential in personalized recognition,medical research,and human machine interface.

关键词： Ultra-stretchable Skin-conformal Self-powered Piezoelectric-enhanced triboelectric nanogenerator Wearable pressure sensor

Hydrogen self-supplying initiators excited by visible light for the fabrication of transparent films

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Science China Chemistry 2024年第11期67卷 3868-3874页

作者： Qingze Pan Chiheng Liu Wenzhe qiao Jianwei Li Saihe Yang Yangyang Xin Pengzhong Chen Jiangli Fan xiaojun Peng State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart Materials Oriented Chemical Engineering Dalian University of Technology Ningbo Institute of Dalian University of Technology Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Liaoning Binhai Laboratory

Unimolecular Type Ⅱ radical photoinitiators(PIs) have received significant attention in photocuring owing to the fact that they improve the sustainability of the overall process compared with traditional Type Ⅱ radical photoinitiators. However, the photopolymerization efficiency of unimolecular Type Ⅱ radical photoinitiators is hindered by their short excitation wavelengths,poor photon capture abilities, and inefficient photobleaching performance. Herein, we report a coumarin-based self-sufficient initiator(C-NA), which is designed by integrating “hydrogen donor” and “hydrogen acceptor” into the coumarin framework and used for single-component visible light curing. C-NA exhibits a visible light absorbance and high molar extinction coefficient and is completely photobleached under the irradiation of 405 nm light-emitting diodes(LEDs). The formation of free radicals arises from the transfer of hydrogen from the diethylamino group to the coumarin framework, together with a highly efficient photodegradation process of C-NA. Finally, C-NA was successfully applied to prepare a transparent film material. Therefore,C-NA offers new insights into the design of promising unimolecular Type Ⅱ radical photoinitiators for photocuring.

关键词： photocuring photoinitiator hydrogen transfer visible light unimolecular photobleaching

A Design of Probe for Measurement of Moisture Content Using Time Domain Reflectometry

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A Design of Probe for Measurement of Moisture Content Using ...

A MEASURING INSTRUMENT FOR MULTIPOINT SOIL TEMPERATURE UNDERGROUND

作者： Wang Cheng Zhao Chunjiang qiao xiaojun Hou Ruifeng National Engineering Research Center for Information Technology in Agriculture

TDR（Time Domain Reflectometry,TDR） is an important method for measuring soil parameters,e.g.,soil water *** this work,a new TDR probe has been developed and a criterion for designing the probe ***,the structure of TDR probe and signal detection circuit is addressed in *** results showed that there is a strong positive linear relationship between the reference measuring instrument and TDR instrument in a watering ***,measurement accuracy of soil moisture was easily influenced by heterogeneity of soil.

关键词： Time Domain Reflectometry TDR Soil Moisture

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A MEASURING INSTRUMENT FOR MULTIPOINT SOIL TEMPERATURE UNDER...