检索结果-南通市图书馆

Deep-red emitting Mg2Ti04:Mn^(4+)phosphor ceramics for plant lighting

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2021年第1期10卷 88-97页

作者： Zixin WANG Hui LIN Dawei ZHANG Yiming SHEN Yang LI Ruijin HONG Chunxian TAO Zhaoxia HAN Lei CHEN Shengming ZHOU Engineering Research Center of optical Instrument and system Ministry of Education and Shanghai Key Lab of Modem Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 Jungong RoadShanghai 200093China Department of Pathology Xinhua HospitalShanghai Jiaotong University School of MedicineShanghai 200093China laboratory of Micro-Nano Optoelectronic Materials and Devices Key Laboratory of Materials for High-Power LaserShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

In this study,deep-red emitting Mg2T i04:Mn4 phosphor ceramics were synthesized by the high temperature solid-state reaction *** ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum(FWMH)value of 31 *** peak wavelength was located at 658 nm,which matched the demanded wavelength for *** crystal field strength(Dq)and the Racah parameters(B and C)were estimated by the Tanabe-Sugano *** thermal conductivity of the Mg2Ti(0.999)O4:0.001Mn^(4+)ceramic was 7.535 W/(m·K)at room temperature,which was one order of magnitude higher than that of the traditional packaging method using the silicone gel.A set of phosphor converted LEDs were fabricated by mounting the phosphor ceramics onto the 460 nm blue LED chips and the CIE coordinates can move from the blue region to the purple light region with the thickness of the ceramic *** results indicated that the Mg2Ti04:Mn^(4+)phosphor ceramic was suitable for plant lighting when combined with a blue LED chip.

关键词： solid state reaction optical properties thermal conductivity ceramic phosphor

Design and assembly of a nested imaging X-ray telescope for the Hot Universe Baryon Surveyor mission

在线全文

学校读者我要写书评

暂无评论

Astronomical Techniques and Instruments 2024年第3期1卷 157-165页

作者： Jun Yu Ruohui Xian Xiaoqiang Wang Yifan Wang Zhanshan Wang Wei Zhang Yibo Cai Jing Yang Xi Lu Wei Wang Wei Cui Institute of Precision optical Engineering Tongji UniversityShanghai 200092China shanghai Institute of Satellite Engineering Shanghai 201109China Department of Astronomy Tsinghua UniversityBeijing 100084China

The Hot Universe Baryon Surveyor (HUBS) mission will carry a nested X-ray telescope capable of observing an energy range from 0.5 keV to 2 keV to study hot baryon evolution. In this paper, we report the latest progress in the design and construction of nested X-ray telescopes which were designed to use a three-stage conic-approximation type assembly to simplify the manufacturing process. The mirror substrate is made using the thermal glass slumping method, with mirrors characterized by a root-mean-square roughness of 0.3 nm, with expected high reflectivity and good thermal stability. We also discuss methods of telescope construction and conduct a deformation analysis of the manufactured mirror. The in situ measurement system program is developed to guide the telescope assembly process.

关键词： Nested X-ray telescope Thermal glass slumping Telescope assembly In situ measurement

Electron-beam irradiation induced optical transmittance enhancement for Au/ITO and ITO/Au/ITO multilayer thin films

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2017年第10期33卷 1107-1112页

作者： Wenzuo Wei Ruijin Hong Jinxia Wang Chunxian Tao Dawei Zhang Engineering Research Center of optical Instrument and system Ministry of Education and Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai 200093 China

Electron beam（EB） irradiation experiments on Au/ITO and ITO/Au/ITO multilayer thin films are *** structure and the optical-electrical properties of the samples were investigated by X-ray diffraction,atomic force microscopy, four-point probe resistivity measurement system, and UV–vis-NIR double beam spectrometer, respectively. Those results show that the EB irradiation has the effects of improving the crystalline of samples, widening the optical band gap of both thin films, reducing the sheet resistance,and improving the transmittance of samples.

关键词： EB irradiation Multilayer thin films Structure optical-electrical properties Transmittance

Vein visualization enhancement by dual-wavelength phase-locked denoising technology

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative optical Health Sciences 2024年第3期17卷 73-83页

作者： Lihua Ruan Zhiqin Yin Shibing Zhou Weibo Zheng Wei Lu Tao Zhang Shaowei Wang shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083P.R.China State key laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083P.R.China shanghai Engineering Research Center of Energy-Saving Coatings shanghai 200083 P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China shanghai Tech University Shanghai 201210P.R.China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210P.R.China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China

Visual near-infrared imaging equipment has broad applications in various fields such as venipuncture,facial injections,and safety verification due to its noncontact,compact,and portable ***,most studies utilize near-infrared single-wavelength for image acquisition of ***,many substances in the skin,including water,protein,and melanin can create significant background noise,which hinders accurate *** this paper,we developed a dual-wavelength imaging system with phase-locked denoising technology to acquire vein *** signals in the effective region are compared by using the absorption valley and peak of hemoglobin at 700nm and 940nm,*** phase-locked denoising algorithm is applied to decrease the noise and interference of complex surroundings from the *** imaging results of the vein are successfully extracted in complex noise *** is demonstrated that the denoising effect on hand veins imaging can be improved with 57.3%by using our dual-wavelength phase-locked denoising ***,this work proposes a novel approach for venous imaging with dual-wavelengths and phase-locked denoising algorithm to extract venous imaging results in complex noisy environment better.

关键词： Dual-wavelength phase-locked denoising vein visualization enhancement.

Single-photon detection and its applications

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1218-1232页

作者： LIANG Yan ZENG HePing shanghai key laboratory of Modern optical system Engineering Research Center of Optical Instrument and System Ministry of Education School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology State key laboratory of Precision Spectroscopy East China Normal University

A single-photon detector is an extremely sensitive device capable of registering photons,offering essential technical support for optics quantum information *** review herein our recent experimental progress in the development and application of single-photon detection *** based on advanced self-differencing,low-pass filtering,frequency up-conversion and photon-number-resolving are introduced for attaining high-speed,high-efficiency,low-noise single-photon detection at infrared *** advantages of high-speed single-photon detection are discussed in some applications,such as the laser ranging and quantum key *** photon-number-resolving detection is shown to support efficient quantum random number generation.

关键词： quantum optics photodetection avalanche photodiode frequency up-conversion

Ultra-thin Glass Film Coated with Graphene: A New Material for Spontaneous Emission Enhancement of Quantum Emitter

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2015年第3期7卷 261-267页

作者： Lu Sun Chun Jiang State key laboratory of Advanced optical Communication system and Networks Shanghai Jiao Tong University

We propose an ultra-thin glass film coated with graphene as a new kind of surrounding material which can greatly enhance spontaneous emission rate(SER) of dipole emitter embedded in it. With properly designed parameters,numerical results show that SER-enhanced factors as high as 1.286 9 106 can be achieved. The influences of glass film thickness and chemical potential/doping level of graphene on spontaneous emission enhancement are also studied in this paper. A comparison is made between graphene and other coating materials such as gold and silver to see their performances in SER enhancement.

关键词： Graphene surface plasmons Graphene plasmonics Quantum electrodynamics Superradiance Subwavelength structures

Improved impossible differential cryptanalysis of large-block Rijndael

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第3期62卷 5-18页

作者： Ya LIU Yifan SHI Dawu GU Bo DAI Fengyu ZHAO Wei LI Zhiqiang LIU Zhiqiang ZENG Engineering Research Center of optical Instrument and system Ministry of Education Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology State key laboratory of Cryptology Department of Computer Science and Engineering Shanghai Jiao Tong University School of Computer Science and Technology Donghua University shanghai key laboratory of Scalable Computing and systems shanghai key laboratory of Integrated Administration Technologies for Information Security Science and Technology on Information Assurance laboratory

Rijndael is a substitution-permutation network（SPN） block cipher for the AES development process. Its block and key sizes range from 128 to 256 bits in steps of 32 bits, which can be denoted by Rijndael-b-k, where b and k are the block and key sizes, respectively. Among them, Rijndael-128-128/192/256,that is, AES, has been studied by many researchers, and the security of other large-block versions of Rijndael has been exploited less frequently. However, more attention has been paid to large-block versions of block ciphers with the fast development of quantum computers. In this paper, we propose improved impossible differential attacks on 10-round Rijndael-256-256, 10-round Rijndael-224-256, and 9-round Rijndael-224-224 using precomputation tables, redundancies of key schedules, and multiple impossible differentials. For 10-round Rijndael-256-256, the data, time, and memory complexities of our attack were approximately 2;chosen plaintexts, 2;encryptions, and 2;blocks, respectively. For 10-round Rijndael-224-256, the data, time, and memory complexities of our attack were approximately 2;chosen plaintexts, 2;encryptions, and 2;blocks, respectively. For 9-round Rijndael-224-224, the data, time, and memory complexities of our attack are approximately 2;chosen plaintexts, 2;encryptions, and 2;blocks,respectively, or 2;chosen plaintexts, 2;encryptions, and 2;blocks, respectively. To the best of our knowledge, our results are currently the best on Rijndael-256-256 and Rijndael-224-224/256.

关键词： block cipher Rijndael precomputation tables impossible di?erentials multiple impossible differential attacks

Screening COVID-19 from chest X-ray images by an optical diffractive neural network with the optimized F number

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2024年第7期12卷 1410-1426页

作者： JIALONG WANG SHOUYU CHAI WENTING GU BOYI LI XUE JIANG YUNXIANG ZHANG HONGEN LIAO XIN LIU DEAN TA Academy for Engineering and Technology Fudan UniversityShanghai 200433China Center for Biomedical Engineering Fudan UniversityShanghai 200433China Department of Chemistry Fudan UniversityShanghai 200433China Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing 100084China

The COVID-19 pandemic continues to significantly impact people's lives worldwide, emphasizing the critical need for effective detection methods. Many existing deep learning-based approaches for COVID-19 detection offer high accuracy but demand substantial computing resources, time, and energy. In this study, we introduce an optical diffractive neural network(ODNN-COVID), which is characterized by low power consumption, efficient parallelization, and fast computing speed for COVID-19 detection. In addition, we explore how the physical parameters of ODNN-COVID affect its diagnostic performance. We identify the F number as a key parameter for evaluating the overall detection capabilities. Through an assessment of the connectivity of the diffractive network, we established an optimized range of F number, offering guidance for constructing optical diffractive neural networks. In the numerical simulations, a three-layer system achieves an impressive overall accuracy of 92.64% and 88.89% in binary-and threeclassification diagnostic tasks. For a single-layer system, the simulation accuracy of 84.17% and the experimental accuracy of 80.83% can be obtained with the same configuration for the binary-classification task, and the simulation accuracy is 80.19% and the experimental accuracy is 74.44% for the three-classification task. Both simulations and experiments validate that the proposed optical diffractive neural network serves as a passive optical processor for effective COVID-19 diagnosis, featuring low power consumption, high parallelization, and fast computing capabilities. Furthermore, ODNN-COVID exhibits versatility, making it adaptable to various image analysis and object classification tasks related to medical fields owing to its general architecture.

关键词： neural network offering

Theoretical analysis of optical force density distribution inside subwavelength-diameter optical fibers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第10期27卷 362-367页

作者： Yun-Yuan Zhang Hua-Kang Yu Xiang-Ke Wang Wan-Ling Wu Fu-Xing Gu Zhi-Yuan Li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China shanghai key laboratory of Modern optical system Engineering Research Center of Optical Instrument and System（Ministry of Education）University of Shanghai for Science and TechnologyShanghai 200093China

We investigate the microscopic optical force density distributions respectively inside a subwavelength-diameter（SD）fiber with flat endface and inside one with oblique endface by using a finite-difference time-domain（FDTD） *** force density distributions at the fiber endfaces can now be readily available. The complete knowledge of optical force density distributions not only reveal features regarding the microscopic near-field optomechanical interaction, but also provide straightforward explanations for the sideway deflections and other mechanical motions. Our results can provide a useful reference for better understanding the mechanical influence when light transports in a microscale or nanoscale structure and for developing future highly-sensitive optomechanical devices.

关键词： subwavelength-diameter optical fibers optical force