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International Symposium on Antennas and Propagation (ISAP)

作者： Tsunayuki Yamamoto Takeo Kobashi Tamami Maruyama Department of Integrated Science and Technology National Institute of Technology Tsuyama College Tsuyama-shi Japan Advanced Electronics and Information System Engineering Course National Institute of Technology Tsuyama College Tsuyama-shi Japan Department of Production Systems Engineering Institute of Technology Hakodate College Hakodate-shi Japan

ISBN: (数字)9798350364774

ISBN: (纸本)9798350364781

In this paper, two technologies of metamaterial for microwave wireless power transfer are shown. One is a zeroth-order resonance for a microwave snow melting system, and another one is a focusing reflector for realizing of a highly efficient wireless power transfer space. A zeroth-order resonance leads a uniformed microwave heating and a flexibility of feeding in a snow melting system. Focusing reflector can make some electromagnetic hot and null points in a space. These are expected to be required technologies for highly efficient wireless power transfer.

关键词： Microwave antennas Microwave technology Electromagnetic heating Snow Focusing Wireless power transfer Resonance Metamaterials Electromagnetics Microwave propagation

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Classification of Bird and Drone Based on Radar Time-Frequency Analysis

Classification of Bird and Drone Based on Radar Time-Frequen...

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IET International Radar Conference 2023, IRC 2023

作者： Li, Jialin Li, Weidong Wang, Rui Liu, Haibo Wang, Lianjun Zhang, TianRan Radar Research Lab School of Information and Electronics Beijing Institute of Technology Beijing100081 China Advanced Technology Research Institute Beijing Institute of Technology Shandong Jinan250300 China Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology Ministry of Education Beijing100081 China Beijing Institute of Electronic System Engineering Beijing100854 China

ISBN: (纸本)9781839539954

To address the classification of 'Low, Small, Slow' targets such as birds and drones, this paper proposes a classification algorithm based on target time-frequency spectrogram analysis. Firstly, radar-collected data is subjected to Short-Time Fourier Transform (STFT) to obtain target time-frequency spectrograms, followed by data preprocessing. Subsequently, these time-frequency spectrograms are fed into the designed neural network Residual Pyramid pooling Net (RPNet) for the classification of the two target classes. Validation results based on radar experimental data demonstrate that this algorithm can effectively classify birds and drones, thereby improving the classification performance of small targets. © The Institution of engineering & Technology 2023.

关键词： Drones

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Simultaneous microwave frequency transfer and time synchronization based mode-locked pulse train over 120 km fiber 11

Simultaneous microwave frequency transfer and time synchroni...

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11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015

作者： Chen, Xing Lu, Jinlong Zhang, Jian Cui, Yifan Lu, Xing Tian, Xusheng Ci, Cheng Liu, Bo Wu, Hong Tang, Tingsong Shi, Kebin Zhang, Zhigang State Key Laboratory of Advanced Optical Communication System Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China School of Electronic Information and Optical Engineering Nankai University Tianjin300071 China Beijing Satellite Navigation Center Beijing100094 China

We demonstrate feed-forward digital compensation technique applied in both precise frequency transfer and time synchronization. The fractional frequency instability was 6.18×10-20 at 2000 s and RMS variation of t... 详细信息

ISBN: (纸本)9781467371094

关键词： Synchronization

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Ultrathin microcrystalline hydrogenated Si/Ge alloyed tandem solar cells towards full solar spectrum conversion

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Frontiers of Chemical Science and engineering 2020年第6期14卷 997-1005页

作者： Yu Cao Xinyun Zhu Xingyu Tong Jing Zhou Jian Ni Jianjun Zhang Jinbo Pang Key Laboratory of Modem Power System Simulation and Control&Renewable Energy Technology Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Northeast Electric Power UniversityJilin 132012China School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Key Laboratory of Photo-electronics Thin Film Devices and Technique of Tianjin Institute of Photo-electronic Thin Film Devices and TechnologyCollege of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research(iAIR)University of JinanJinan 250022China

Thin film solar cells have been proved the next generation photovoltaic devices due to their low cost,less material consumption and easy mass *** them,micro-crystalline Si and Ge based thin film solar cells have advantages of high efficiency and ultrathin absorber *** individual junction devices are limited in photoelectric conversion efficiency because of the restricted solar spectrum range for its specific *** this work,w e designed a nd simulated a multi-junction solar cell with its four sub-cells selectively absorbing the full solar spectrum including the ultraviolet,green,red as well as near infrared range,respectively.B y tuning the G e content,the record efficiency of 24.80%has been realized with the typical quadruple junction structure of a-Si:H/a-Si0.9Ge0.1:H/μc-Si:H/μc-Si0.5Ge0.5:*** further reduce the material cost,thickness dependent device performances have been *** can be found that the design of total thickness of 4μm is the optimal device design in balancing the thickness a nd the *** the design of ultrathin quadruple junction device with total thickness of 2μm is the optimized device design regarding cost and long-term stability with a little bit more reduction in *** results indicated that our solar cells combine the advantages of low cost and high *** work may provide a general guidance rule of utilizing the full solar spectrum for developing high efficiency and ultrathin multi-junction solar cells.

关键词： thin films solar cells quadruple junction solar cell amorphous silicon silicon germanium alloy quantum efficiency

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Fabrication of DLC-based micro-gear patterns by room-temperature curing nanoimprint lithography using glass-like carbon molds

Fabrication of DLC-based micro-gear patterns by room-tempera...

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2012 MRS Fall Meeting

作者： Kiyohara, Shuji Ikegaki, Tomu Ito, Chigaya Ishikawa, Ippei Tanoue, Hideto Takikawa, Hirofumi Taguchi, Yoshio Sugiyama, Yoshinari Omata, Yukiko Kurashima, Yuichi Electric and Control System Engineering Course Faculty of Advanced Engineering Maizuru National College of Technology 234 Aza Shiroya Maizuru Kyoto 625-8511 Japan Department of Electrical and Electronic Information Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tenpaku Toyohashi Aichi 441-8580 Japan Application and Technical Section ELIONIX INC 3-7-6 Motoyokoyama Hachioji Tokyo 192-0063 Japan Research Center for Ubiquitous MEMS and Micro Engineering AIST 1-2-1 Namiki Tsukuba Ibaraki 305-8564 Japan

ISBN: (纸本)9781632661043

The fabrication of diamond-like carbon (DLC) micro-gear by room temperature curing nanoimprint lithography (RTC-NIL) using glass-like carbon (GC) molds as applications to the DLC-based medical MEMS (Micro Electronic Mechanical systems) was investigated. The DLC film which has excellent properties similar to chemical vapor deposited (CVD) diamond films was used as the patterning material. We propose GC as mold material because GC has higher etching selectivity than a diamond film. The etching selectivity of polysiloxane film against a GC substrate is about 5 times as high as that of a diamond film. Therefore we fabricated the GC molds that have micro-gear patterns with 30 μm-tip diameter and 500 nm-tooth thickness. We carried out the RTC-NIL process using the GC micro-gear molds under the following optimum conditions. 1 min-time from spin-coating to imprint: t1, 0.5 MPa-imprinting pressure: P and 5 min-holding time: t2, and then the imprinted polysiloxane pattern on DLC film was processed with an electron cyclotron resonance (ECR) oxygen ion shower. However, we were not able to fabricate micro-gear patterns in high accuracy because of a remaining residual layer on the DLC film. Therefore we propose the removing process for the residual layer with trifluoromethane (CHF3) ion shower under the optimum conditions of 300 eV-ion energy and 4 min-etching time. As a result, we succeeded to fabricate concave DLC-based micro-gear patterns in high accuracy which has 30 μm-tip diameter and 1 μm-depth. © 2013 Materials Research Society.

关键词： Molds

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Fabrication of micro-OLEDs by room-temperature curing nanocontact-print lithography using DLC molds

Fabrication of micro-OLEDs by room-temperature curing nanoco...

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2012 MRS Fall Meeting

作者： Ishikawa, Ippei Sakurai, Keisuke Kiyohara, Shuji Okuno, Taisuke Tanoue, Hideto Suda, Yoshiyuki Takikawa, Hirofumi Taguchi, Yoshio Sugiyama, Yoshinari Omata, Yukiko Kurashima, Yuichi Electric and Control System Engineering Course Faculty of Advanced Engineering Maizuru National College of Technology 234 Shiroya Maizuru Kyoto 625-8511 Japan Department of Electrical and Electronic Information Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tenpaku Toyohashi Aichi 441-8580 Japan Application and Technical Section Elionix Inc. 3-7-6 Motoyokoyama Hachioji Tokyo 192-0063 Japan Research Center for Ubiquitous MEMS and Micro Engineering AIST 1-2-1 Namiki Tsukuba Ibaraki 305-8564 Japan

ISBN: (纸本)9781632661043

The microfabrication technologies for organic light-emitting devices (OLEDs) are essential to the fabrication of the next generation of light-emitting devices. The micro-OLEDs fabricated by room-temperature curing nanoimprint lithography (RTC-NIL) using diamond molds have been investigated. However, light emissions from 10 μm-square-dot OLEDs fabricated by the RTC-NIL method have not been uniform. Therefore, we proposed the fabrication of micro-OLEDs by room-temperature curing nanocontact-print lithography (RTC-NCL) using the diamond-like carbon (DLC) mold. The DLC molds used in RTC-NCL were fabricated by an electron cyclotron resonance (ECR) oxygen ion shower with polysiloxane oxide mask in electron beam (EB) lithography technology. The mold patterns are square and rectangle dots which has 10 μm-width, 10 μm-width and 50 μm-length, respectively. The height of the patterns is 500 nm. The DLC molds were used to form the insulating layer of polysiloxane in RTC-NCL. We carried out the RTC-NCL process using the DLC mold under the following optimum conditions: 0.1 MPa-pressure for coating DLC mold with polysiloxane film, 2.1 MPa-pressure for transferring polysiloxane from DLC mold pattern to indium tin oxide (ITO) glass substrate. We deposited N,N′-Diphenyl -N,N′-di (m-tolyl)benzidine (TPD) [40 nm-thickness] as hole transport layer / Tris(8-quinolinolato)aluminum (Alq3) [40 nm-thickness] as electron transport layer / A1 [200 nm-thickness] as cathode on ITO glass substrate as anode in this order. We succeeded in formation of the insulating layer with square and rectangle dots which has 10 μm-width, 10 μm-width and 50 μm-length, and operation of micro-OLEDs by RTC-NIL using DLC molds. © 2012 Materials Research Society.

关键词： Silicones

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Nonvolatile Reconfigurable Phase-change-materials Integrated Silicon Photonics

Nonvolatile Reconfigurable Phase-change-materials Integrated...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Xu, Kai Wei, Maoliang Tang, Bo Li, Junying Yun, Yiting Lei, Kunhao Wu, Yingchun Li, Lan Lin, Hongtao Zhejiang University State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic Engineering Hangzhou China Institute of Microelectronics of the Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Hangzhou Institute for Advanced Study Hangzhou China Westlake University Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Hangzhou China Westlake Institute for Advanced Study Institute of Advanced Technology Hangzhou China

ISBN: (纸本)9798350375909

The emergence of integrated photonic technology provides an attractive solution of high speed, broad bandwidth and strong parallelism for large-scale information transmission and processing in interconnection, communication and computing. Reconfigurability is necessary for photonic processors to adapt varieties of application scenarios in the fields of data exchange, microwave photonics and neural networks. As yet, thermo-optical effect and carrier plasma dispersion effect are the most common phenomena for optical modulation. However, the volatility not only requires continuous power supply to maintain the devices' state, but also accompanies with serious thermal crosstalk induced by active regions. Hence, the nonvolatile methods that can reconfigure and fix on the current state for a long time after a single external excitation are considered as one of the significant technologies in the next generation of integrated photonics. Nonvolatile reconfiguration has been achieved through trapped-charge effect, bistable micro-electromechanical system (MEMS) with nano-latch mechanism and ferroelectric materials, which suffer from high loss, lower stability and complex process flow. Chalcogenide phase change materials (PCM) have become a promising method to realize compact and nonvolatile reconfigurable integrated photonic devices due to the high optical constant contrast between amorphous state and crystalline state, superiorly stable property and low temperature deposition possibility. Here, we developed a monolithic back-end-of-line integration technology of PCM in silicon photonics, supporting "Zero-change"heterogeneous integration platform at wafer scale. On this basis, nonvolatile integrated photonic devices with excellent performance have been fabricated. It lays a foundation for improving the energy efficiency and integration density of integrated photonic processors and suppressing thermal crosstalk between integrated photonic devices. © 2024 IEEE.

关键词： Silicon wafers

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Pneumatic rubber actuators for a rehabilitation device to prevent contractures of finger joints

Pneumatic rubber actuators for a rehabilitation device to pr...

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International Conference on Mechatronics and Machine Vision in Practice

作者： Hironari Taniguchi Hidenori Toyooka Tetsuya Minatohara Makoto Fukuda Feifei Zhao Department of Electronics and Control Engineering Tsuyama National College of Technology Tsuyama-city OKAYAMA 708-8509 JAPAN Advanced Mechanical and Control System Engineering Course Tsuyama National College of Technology Tsuyama-city OKAYAMA 708-8509 JAPAN

ISBN: (纸本)9781467316439

There has been increased interest in use of pneumatic actuators in many fields, such as medical care and welfare. In particular, a pneumatic rubber actuator with soft material has many advantages such as low mass, flexibility, safety and user-friendliness. We therefore focus on pneumatic rubber actuators as a drive source of a rehabilitation device. This paper presents pneumatic rubber actuators for a rehabilitation device to prevent contractures of the finger joints. We propose two types of actuators. The fabrication of the actuators was based on molding silicon rubber. The actuators can not only operate in flexion and extension but can also twist and stretch out the finger. The actuators force and motion were characterized at different supply pressures. In addition, we investigated different possible methods of rehabilitation for fingers using the actuators. The metacarpophalangeal (MP) and the proximal interphalangeal (PIP) joint motion -were measured with the supply pressure of 150 kPa. The range of MP/PIP joint motion was from minus 3/9 degrees to 53/55 degrees. It was shown about 40 percent of its normal range. As a result, we confirmed the viability of the actuators for a finger rehabilitation device.

关键词： Pneumatic actuator rehabilitation device preventing contractures. actuators Pneumatic actuators Contracture supply pressures Pneumatic Finger Joint Rehabilitation rubbers Lake Restoration Fingers

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Epidermal piezoresistive structure with deep learning-assisted data translation

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npj Flexible electronics 2022年第1期6卷 672-680页

作者： Changrok So Jong Uk Kim Haiwen Luan Sang Uk Park Hyochan Kim Seungyong Han Doyoung Kim Changhwan Shin Tae-il Kim Wi Hyoung Lee Yoonseok Park Keun Heo Hyoung Won Baac Jong Hwan Ko Sang Min Won Department of Electrical and Computer Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea School of Chemical Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Querrey Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL 60208USA Department of Mechanical Engineering Ajou UniversitySuwon 16499Republic of Korea School of Electrical Engineering Korea UniversitySeoul 02841Republic of Korea Biomedical Institute for Convergence(BICS) Sungkyunkwan University(SKKU)Suwon 16419Korea Department of Organic and Nano System Engineering Konkuk UniversitySeoul 05029Republic of Korea Department of Advanced Materials Engineering for Information and Electronics Kyung Hee UniversityYongin 17104Republic of Korea School of Semiconductor and Chemical Engineering Jeonbuk National UniversityJeonju 54896Republic of Korea

Continued research on the epidermal electronic sensor aims to develop sophisticated platforms that reproduce key multimodal responses in human skin,with the ability to sense various external stimuli,such as pressure,shear,torsion,and *** development of such applications utilizes algorithmic interpretations to analyze the complex stimulus shape,magnitude,and various moduli of the epidermis,requiring multiple complex equations for the attached *** this experiment,we integrate silicon piezoresistors with a customized deep learning data process to facilitate in the precise evaluation and assessment of various stimuli without the need for such *** the ability to surpass conventional vanilla deep regression models,the customized regression and classification model is capable of predicting the magnitude of the external force,epidermal hardness and object shape with an average mean absolute percentage error and accuracy of<15 and 96.9%,*** technical ability of the deep learning-aided sensor and the consequent accurate data process provide important foundations for the future sensory electronic system.

关键词： utilize attached precise

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Free-spectral-range-free filters with ultrawide tunability across the S+C+L band

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Photonics Research 2021年第6期9卷 1013-1018页

作者： CHUNLEI SUN CHUYU ZHONG MAOLIANG WEI HUI MA YE LUO ZEQUN CHEN RENJIE TANG JIALING JIAN HONGTAO LIN LAN LI Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China School of Microelectronics Zhejiang UniversityHangzhou 310027China

Optical filters are essential parts of advanced optical communication and sensing *** them,the ones with an ultrawide free spectral range(FSR)are especially *** are promising to provide access to numerous wavelength channels highly desired for large-capacity optical transmission and multipoint multiparameter *** schemes for wide-FSR filters either suffer from limited cavity length or poor fabrication tolerance or impose an additional active-tuning control *** theoretically and experimentally demonstrate a filter that features FSR-free operation capability,subnanometer optical bandwidth,and acceptable fabrication *** one single deep dip within a record-large waveband(S+C+L band)is observed by appropriately designing a side-coupled Bragg-grating-assisted Fabry–Perot filter,which has been applied as the basic sensing unit for both the refractive index and temperature *** such basic units are also cascaded in series to demonstrate a multichannel *** work provides a new insight to design FSR-free filters and opens up a possibility of flexible large-capacity integration using more wavelength channels,which will greatly advance integrated photonics in optical communication and sensing.

关键词： free desired insight

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