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2019 International Conference on Optical Instruments and technology: Optical sensor and Applications

作者： Yi, Duo Zhang, Zenan Geng, Youfu Li, Xuejin Hong, Xueming School of Physics and Optoelectronic Engineering Shenzhen University Shenzhen China Shenzhen Key Laboratory of Sensor Technology Shenzhen China Shenzhen Engineering Laboratory for Optical Fiber Sensors and Networks Shenzhen China School of Civil and Transportation Engineering Shenzhen University Shenzhen China Chinese University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)9781510636507

This study proposes a novel fiber-optic interferometer based on the single-mode fiber-no core fiber-single mode fiber structure with the coated polydimethylsiloxane (PDMS). The no core fiber is the key carrier to excite the modal interference, and the PDMS that covers onto the fiber cascade structure is able to enhance the sensor sensitivity and also protect the sensor structure. The experimental results verify that the proposed sensor owns a high temperature sensitivity and the strain sensitivity, and it is particularly suitable for multi-parameter measurements. © 2020 SPIE.

关键词： Polydimethylsiloxane

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Competing effects of temperature and mechanical stress on polar vortex transition in oxide superlattices

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Physical Review B 2024年第19期110卷 195417-195417页

作者： Pan Chen Xu Hou Jiandi Zhang Congbing Tan Peng Gao Yan Liang Xuezeng Tian Lei Liao Xu-Sheng Yang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China International Center for Quantum Materials and Electron Microscopy Laboratory School of Physics Peking University Beijing 100871 China Department of Industrial and Systems Engineering Research Institute for Advanced Manufacturing The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China Department of Engineering Mechanics Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Zheda Road 38 Hangzhou Zhejiang 310027 China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518060 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and Electronics Hunan University of Science and Technology 411201 Hunan Xiangtan China

The interplay of different forms of energies in oxide superlattices, such as elastic, electrostatic, and gradient energies, can result in a stable long-range ordered polar vortex structure at room temperature. However, the role between these energies in determining the vortex structure still remains largely elusive due to the intricate interplay. By using a comprehensive in situ TEM apparatus and a prototype system, PbTiO3/SrTiO3 superlattice, we demonstrate that the vortex structure undergoes a first-order transition at the temperature around 653 K, while the application of in-plane mechanical stress at such a high temperature results in the reemergence of vortex structure. Cryogenic cooling to 94 K raises the stability of vortices, which would be destabilized by loading of out-of-plane mechanical stress. The results can be reproduced and well interpreted by phase-field simulations. These findings not only reveal the competing role of the temperature and mechanical stress at atomic scale but also demonstrate a feasible way to operate the vortex-based nanodevices working in harsh environments.

关键词： Electric polarization Ferroelectricity Electron diffraction Electron microscopy Liquid nitrogen cooling Phase-field modeling Scanning probe microscopy

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A Low-Power-Consumption FBG sensor Interrogator

A Low-Power-Consumption FBG Sensor Interrogator

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International Conference on Electronics, Communications and Information technology (CECIT)

作者： Shuting Dai George Y. Chen Qingshan Yang Guangxian Jin Zegong Wu Yanong Ning TongYu Liu Qilu University of Technology (Shandong Academy of Sciences) Jinan China Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors Shenzhen University Shenzhen China Shandong Micro-Sensor Photonics Co. Ltd Jinan China

This paper presents a low-power-consumption fiber grating interrogation system based on Vertical Cavity Surface Emitting Laser (VCSEL). The system exhibits a 3.5 nm tuning range and less than 100 mW power consumption. The advantages of the temperature-free VCSEL interrogation system are fully utilized to form a separate, low-power, miniaturized FBG sensing interrogation system with Wireless sensor network sensor *** practicability and validity of the system are verified by the experimental results of temperature monitoring. It is an effective solution for applications involving few and concentrated monitoring points of temperature and stress.

关键词： Temperature sensors Temperature measurement Wireless sensor networks Optical fiber sensors Power demand Optical fiber networks Fiber gratings

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Knowledge Mapping of Opuntia Milpa Alta Since 1998: A Scientometric Analysis

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Phyton-International Journal of Experimental Botany 2021年第5期90卷 1507-1518页

作者： Meixiang Chen Hong Yang Zhengda Song Yonghua Gu Yuhong Zheng Jiangwei Zhu Aiwu Wang Li Fu Institute of Botany Jiangsu Province and Chinese Academy of Sciences(Nanjing Botanical GardenMem.Sun Yat-Sen)Nanjing210014China The Jiangsu Provincial Platform for Conservation and Utilization of Agricultural Germplasm Nanjing210014China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing210037China Center for Advanced Material Diagnostic Technology Shenzhen Technology UniversityShenzhen518118China Key Laboratory of Novel Materials for Sensor of Zhejiang Province College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou310018China

Opuntia Milpa Alta is a cactus cultivated,domesticated,hybridized and selected from the plant Opuntia ficusindica by Mexican agricultural experts,which can be used as fruit and *** Milpa Alta leaves and fruit are superior to wild varieties and suitable for storage and *** 1998,Opuntia Milpa Alta was introduced to China from Mexico by the Quality Product Development Center of the Ministry of Agriculture of *** to now,the Opuntia Milpa Alta has been cultivated on a certain scale in *** study aims to identify the research progress and development trends of Opuntia Milpa Alta in *** published between 1998 to 2019 from two major Chinese academic databases(CNKI and Wangfang)with a topic search related to Opuntia Milpa Alta were *** research progress and development trends were analyzed based on CiteSpace software of text mining and *** analysis found that Opuntia Milpa Alta has gone through three obvious research phases after being introduced to *** the first phase,the researchers paid attention to its cultivation ***,researchers began to use extraction methods to extract some of its components,such as polysaccharides and ***,these extracted ingredients began to be used in some biomedical research.

关键词： Opuntia Milpa Alta China bibliometric analysis planting technique biomedical uses

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An Improved Fused EM Algorithm for PET Image Reconstruction

An Improved Fused EM Algorithm for PET Image Reconstruction

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2020 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2020

作者： Zhu, Shanshan Liang, Dong Liu, Xin Zheng, Hairong Yang, Yongfeng Hu, Zhanli Hubei Key Laboratory of Broadband Wireless Communication and Sensor Networks Wuhan University of Technology Wuhan430070 China The Lauterbur Research Center for Biomedical Imaging Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China

ISBN: (纸本)9781728176932

This paper presents an improved PET image reconstruction method based on iterative method. Emission tomography (PET) is an advanced clinical imaging technique in nuclear medicine. PET can be specifically injected with a radioactive tracer to detect activity at the molecular level in the tissue, but, the tracer injection poses a potential radiation risk to the patient. However, the limitation of injection dose and collection time leads to the relatively poor spatial resolution and high noise level of positron emission imaging, which makes the quantitative interpretation of PET images difficult. Therefore, the research and development of new low-dose PET imaging methods can not only ensure the quality of PET imaging but also reduce the harmful radiation dose, which has important scientific significance and application prospect in the field of medical diagnosis. The reconstruction framework proposed in this paper is based on the traditional maximum likelihood expectation maximization (ML-EM) method and the bootstrapping filter method. First, the ML-EM method is used to directly reconstruct an image, which is used as a guide. Secondly, perform Anscombe transform and filter on the projection data, followed by inverse transformation. The processed data was also reconstructed with ML-EM, and the resulting image was used as the guide image. The two images generated in the first two steps were fed into the guide filter to obtain the final image. For simplicity, the proposed improved fusion EM method is named IF-EM. In this paper, we present qualitative and quantitative results from simulation data, which show that the proposed method has good statistical performance. © 2020 IEEE

关键词： Image reconstruction

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2D Nanomaterials for Effective Energy Scavenging

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Nano-Micro Letters 2021年第5期13卷 151-191页

作者： Md Al Mahadi Hasan Yuanhao Wang Chris R.Bowen Ya Yang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro‑Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083People’s Republic of China SUSTech Engineering Innovation Center School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhenGuangdong 518055People’s Republic of China Department of Mechanical Engineering University of BathBath BA27AKUK School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004People’s Republic of China

The development of a nation is deeply related to its energy consumption.2D nanomaterials have become a spotlight for energy harvesting applications from the small-scale of low-power electronics to a large-scale for industry-level applications,such as self-powered sensor devices,environmental monitoring,and large-scale power *** from around the world are working to utilize their engrossing properties to overcome the challenges in material selection and fabrication technologies for compact energy scavenging devices to replace batteries and traditional power *** this review,the variety of techniques for scavenging energies from sustainable sources such as solar,air,waste heat,and surrounding mechanical forces are discussed that exploit the fascinating properties of 2D *** addition,practical applications of these fabricated power generating devices and their performance as an alternative to conventional power supplies are discussed with the future pertinence to solve the energy problems in various fields and applications.

关键词： 2D nanomaterials Solar energy Tribo-/piezo-/thermo-/pyro-electricity Osmotic power generation Self-powered sensor

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Mechanoluminescent materials for athletic analytics in sports science

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Science Bulletin 2021年第3期66卷 206-209页

作者： Dengfeng Peng Chunfeng Wang Ronghua Ma Shaohui Mao Sicen Qu Zhanbing Ren Sergii Golovynskyi Caofeng Pan College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Department of Physical Education Shenzhen UniversityShenzhen 518060China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China

Life lies in movement,and sport is one of the most important parts in our *** the development of advanced science and technology,such as the Internet of Things and big data,sports science has experienced some revolutionary changes[1].This raises a higher demand to the body and health conditions and promotes various athletic events in terms of entertainments,exercises and competitions.

关键词： entertainment evolutionary sports

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Reduced CoNi2S4 nanosheets decorated by sulfur vacancies with enhanced electrochemical performance for asymmetric supercapacitors

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Science China Materials 2020年第7期63卷 1216-1226页

作者： Yanpeng Liu Yuxiang Wen Yanan Zhang Xiaogang Wu Haoqian Li Hangda Chen Juanjuan Huang Guohan Liu Shanglong Peng National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Institute of Sensor Technology Gansu Academy of SciencesLanzhou 730000China

Nowadays,it is a matter of great concern to design electrode materials with excellent electrochemical performance for supercapacitors by a safe,efficient and simple *** these characteristics are usually related to the vacancies and impurities in the *** investigate the effect of the vacancies on the electrochemical properties of the supercapacitor cathode material,the uniform reduced CoNi2S4(r-CoNi2S4)nanosheets with sulfur vacancies have been successfully prepared by a one-step hydrothermal *** the formation of sulfur vacancies are characterized by Raman,X-ray photoelectron spectroscopy and other *** the electrode for supercapacitor,the r-CoNi2S4 nanosheet electrode delivers a high capacity of 1918.9 Fg-1 at a current density of 1 A g-1,superior rate capability(87.9%retention at a current density of 20 A g-1)and extraordinary cycling *** with the original CoNi2S4 nanosheet electrode(1226 F g-1at current density of 1 A g-1),the r-CoNi2S4 nanosheet electrode shows a great *** asymmetric supercapacitor based on the r-CoNi2S4 positive electrode and activated carbon negative electrode exhibits a high energy density of 30.3 Wh kg-1 at a power density of 802.1 W kg-1,as well as excellent long-term cycling *** feasibility and great potential of the device in practical applications have been successfully proved by lightening the light emitting diodes of three different colors.

关键词： defect engineering sulfur vacancies electrochemical performance asymmetric supercapacitors

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A multimodal ion electronic skin for decoupling temperature and strain

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Science Bulletin 2021年第24期66卷 2437-2439页

作者： Juan Tao Chunfeng Wang Caofeng Pan College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China

Human skin possessing abundant thermal and mechanical receptors can distinctively perceive temperature and various mechanical deformations[1].Mimicking of skin has been emerging with the breakthrough in human–machine interfaces,automation,smart robotics,and Internet of Things,and tactile sensors with onefold sensing capability are gradually inadequate to meet the complex application scenarios.

关键词：电子皮肤多模态 breakthrough

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Epitaxial lift-off for controllable single-crystalline perovskites

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Science Bulletin 2021年第1期66卷 6-8,M0003页

作者： Dengfeng Peng Xianhu Liu Caofeng Pan College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Materials Processing and Mold(Ministry of Education) Zhengzhou UniversityZhengzhou 450002China

The intriguing attributes of organic-inorganic hybrid perovskites,such as excellent carrier dynamics,outstanding optical tunability,and cost-effective solution processability,have put them on par with or even to be pa... 详细信息

关键词：剥离技术钙钛矿可控制备

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