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Compact CubeSat Gamma-ray detector for GRID mission

Nuclear Science and Techniques 2021年第9期32卷 105-115页

作者： Jia-Xing Wen Xu-Tao Zheng Jian-Dong Yu Yue-Peng Che Dong-Xin Yang huai-zhong gao Yi-Fei Jin Xiang-Yun Long Yi-Hui Liu Da-Cheng Xu Yu-Chong Zhang Ming Zeng Yang Tian Hua Feng Zhi Zeng Ji-Rong Cang Qiong Wu Zong-Qing Zhao Bin-Bin Zhang Peng An GRID collaboration Key Laboratory of Particle and Radiation Imaging(Tsinghua University) Ministry of EducationBeijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterCAEPMianyang 621900China School of Electronic and Information Engineering Ningbo University of TechnologyNingbo 315201China Department of Astronomy Tsinghua UniversityBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210093China Nanjing University School of Astronomy and Space SciencesNanjing 210093China

Gamma-Ray Integrated Detectors(GRID)mis-sion is a student project designed to use multiple gamma-ray detectors carried by nanosatellites(CubeSats),forming a full-time all-sky gamma-ray detection network that monitors the transient gamma-ray sky in the multi-mes-senger astronomy era.A compact CubeSat gamma-ray detector,including its hardware and firmware,was designed and implemented for the *** detector employs four Gd 2 Al 2 Ga 3 O 12:Ce(GAGG:Ce)scintillators coupled with four silicon photomultiplier(SiPM)arrays to achieve a high gamma-ray detection efficiency between 10 keV and 2 MeV with low power and small *** first detector designed by the undergraduate student team onboard a commercial CubeSat was launched into a Sun-synchronous orbit on October 29,*** detector was in a normal observation state and accumulated data for approximately one month after on-orbit functional and performance tests,which were conducted in 2019.

关键词： Gamma-ray bursts Scintillation detectors SiPM CubeSat

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Optimized online filter stack spectrometer for ultrashort X-ray pulses

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Nuclear Science and Techniques 2024年第5期35卷 85-98页

作者： Jia-Xing Wen Ge Ma Ming-Hai Yu Yu-Chi Wu Yong-Hong Yan Shao-Yi Wang huai-zhong gao Lu-Shan Wang Yu-Gang Zhou Qiang Li Yue Yang Fang Tan Xiao-Hui Zhang Jie Zhang Wen-Bo Mo Jing-Qin Su Wei-Min Zhou Yu-Qiu Gu Ming Zeng Zong-Qing Zhao Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterCAEPMianyang 621900China Department of Engineering Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Particle and Radiation Imaging(Tsinghua University) Ministry of EducationBeijing 100084China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010China

Currently,with the advent of high-repetition-rate laser-plasma experiments,the demand for online diagnosis for the X-ray spectrum is increasing because the laser-plasma-generated X-ray spectrum is very important for characterizing electron dynamics and *** this study,scintillators and silicon PIN(P-type–intrinsic-N-type semiconductor)diodes were used to construct a wideband online filter stack *** X-ray sensor and filter arrangement was optimized using a genetic algorithm to minimize the condition number of the response ***,the unfolding error was significantly reduced based on numerical *** detector responses were quantitatively calibrated by irradiating the scintillator and PIN diode with various nuclides and comparing the measuredγ-ray peaks.A prototype 15-channel spectrometer was developed by integrating an X-ray detector with front-and back-end *** prototype spectrometer could record X-ray pulse signals at a repetition rate of 1 ***,an optimized spectrometer was employed to record the real-time spectra of laser-driven bremsstrahlung *** optimized spectrometer offers a compact solution for spectrum diagnostics of ultrashort X-ray pulses,exhibiting improved accuracy in terms of spectrum measurements and repetition rates,and could be widely used in next-generation high-repetition-rate high-power laser facilities.

关键词： Filter stack spectrometer Laser plasma diagnostics X-ray diagnostics Scintillator PIN diode

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A Class of Second-Order Consensus Protocol in Multi-Agent Systems with Multiple Input Delays

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Journal of Systems Science & Complexity 2019年第5期32卷 1280-1289页

作者： WU huai gao Kai AN Baoran Institute of Computer Application China Academy of Engineering PhysicsMianyang 621900China Jiangsu Automation Research Institute Lianyungang 222061China Institute of Computer Application China Academy of Engineering PhysicsMianyang 621900China.

This paper is concerned with the consensus problems for second-order multi-agent systems with multiple input delays. Different from all standard consensus algorithms with uniform delays, the authors aim to find the largest input-delay margin which can guarantee the consensus for the case when delays are nonuniform. Based on frequency domain analysis and matrix theory, an upper bound for maximum tolerable input-delay is given in terms of the relationship with scaling strengths and largest eigenvalue of the Lapalician matrix. Simulation results are provided to illustrate the obtained results.

关键词： Consensus multiple input delays second-order multi-agent systems

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Effect of lower bainite/martensite/retained austenite triplex microstructure on the mechanical properties of a low-carbon steel with quenching and partitioning process

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International Journal of Minerals,Metallurgy and Materials 2016年第3期23卷 303-313页

作者： Wan-song Li Hong-ye gao zhong-yi Li Hideharu Nakashima Satoshi Hata Wen-huai Tian School of Materials Science and Engineering University of Science and Technology Beijing Interdisciplinary Graduate School of Engineering Sciences Kyushu University

We present a study concerning Fe-0. 176C-1.31Si-1.58Mn-0.26Al-0.3Cr （wt%） steel subjected to a quenching and partitioning （Q＆P） process. The results of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and tensile tests demon- strate that the microstructures primarily consist of lath martensite, retained austenite, lower bainite （LB）, and a small amount of tempered martensite; moreover, few twin austenite grains were observed. In the microstrucmre, three types of retained austenite with different sizes and morphologies were observed： blocky retained austenite （-300 nm in width）, film-like retained austenite （80-120 nm in width）, and ul- tra-fine film-like retained austenite （30-40 nm in width）. Because of the effect of the retained austenite/martensite/LB triplex microstructure, the specimens prepared using different quenching temperatures exhibit high ultimate tensile strength and yield strength. Furthermore, the strength effect of LB can partially counteract the decreasing strength effect of martensite. The formation of LB substantially reduces the amount of retained austenite. Analyses of the retained austenite and the amount of blocky retained austenite indicated that the carbon content is critical to the total elongation of Q＆P steel.

关键词： low-carbon steel quenching partitioning retained austenite rnicrostructure mechanical properties

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Strongly Irreducible Operators on Banach Spaces

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Acta Mathematica Sinica,English Series 2012年第4期28卷 727-740页

作者： Yun Nan ZHANG huai Jie zhong School of Mathematics and Computer Science Fujian Normal University Mathematics and Information Science College Hebei Normal University

This paper firstly discusses the existence of strongly irreducible operators on Banach spaces. It shows that there exist strongly irreducible operators on Banach spaces with w＊-separable dual. It also gives some properties of strongly irreducible operators on Banach spaces. In particular, if T is a strongly irreducible operator on an infinite-dimensional Banach space, then T is not of finite rank and T is not an algebraic operator. On Banach spaces with subsymmetric bases, including infinite-dimensional separable Hilbert spaces, it shows that quasisimilarity does not preserve strong irreducibility. In addition, we show that the strong irreducibility of an operator does not imply the strong irreducibility of its conjugate operator, which is not the same as the property in Hilbert spaces.

关键词： Banach spaces strongly irreducible operators w*-separable quasisimilar

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On Hereditarily Indecomposable Banach Spaces

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Acta Mathematica Sinica,English Series 2006年第3期22卷 751-756页

作者： Li Xin CHENG huai Jie zhong Department of Mathematics Xiamen University The Institute of Mathematical Sciences The Chinese University of Hang Kong Department of Mathematics Fujian Normal University

This paper shows that every non-separable hereditarily indecomposable Banach space admits an equivalent strictly convex norm, but its bi-dual can never have such a one; consequently, every non-separable hereditarily i... 详细信息

关键词： decomposition of spaces hereditarily indecomposable Banach space renormings

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The Generalized West Decomposition of Operators and Other Compact Perturbation Problems

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Acta Mathematica Sinica,English Series 2006年第2期22卷 515-522页

作者： Wei Gang SU huai Jie zhong School of Mathematics and Computer Science Fujian Normal University

This paper introduces the concept of the generalized Riesz operators and the concept of the generalized West decomposition of a general operator which generalizes the definition of the West decomposition of Riesz operators, and proves that the following three statements are equivalent on a general Banach space：（a） Every generalized Riesz operator has the generalized West decomposition; （b） Every operator makes strong Stampfli theorem true; Every operator has Apostol＇s compact correction.

关键词： correction Banach space generalized Riesz operator generalized West decomposition compact

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On K-groups of Operator Algebra on the 1-shift Space

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Acta Mathematica Sinica,English Series 2008年第10期24卷 1675-1686页

作者： Qiao Fen JIANG huai Jie zhong College of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 P. R. China

In this paper we discuss the K-groups of Wiener algebra ;W. For the 1-shift space XGM2,We obtain a characterization of Fredholm operators on X^nGM2 for all n ∈ N. We also calculate the K-groups of operator algebra on... 详细信息

关键词： 1-shift space operator algebra K-group

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New Results on Common Properties of Bounded Linear Operators RS and SR

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Acta Mathematica Sinica,English Series 2013年第10期29卷 1871-1884页

作者： Qing Ping ZENG huai Jie zhong School of Mathematics and Computer Science Fujian Normal University

Let X, Y be Banach spaces, R ： X → Y emd S ： Y →X be bounded linear operators. When λ ≠ 0, we investigate common properties of λ i - SR and ,λ I - RS. This work should be viewed as a continuation of researches of Barnes and Lin et al.. We also apply these results obtained to B-Fredholm theory, extensions and Aluthge transforms.

关键词： Regularity spectrum extension aluthge transform

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An image encryption algorithm based on improved baker transformation and chaotic S-box

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Chinese Physics B 2021年第6期30卷 216-225页

作者： Xing-Yuan Wang huai-huai Sun Hao gao School of Information Science and Technology Dalian Maritime UniversityDalian 116026China

The algorithm is an image encryption algorithm based on the improved baker transformation and chaotic substitution box(S-box). It mainly uses the initial values and parameters of a one-dimensional logistic chaotic system as an encryption key. Specifically, in the image scrambling stage, the algorithm primarily uses an improved baker transform method to process the image. In the image diffusion stage, the algorithm first uses the chaotic S-box method to process the encryption key. Secondly, an exclusive OR(XOR) operation is performed on the image and the encryption key to initially diffuse the image. Finally, the image is again diffused using the method of ortho XOR. Simulation analysis shows that the algorithm can achieve good encryption effect, simple and easy implementation, and good security. In the digital image communication transmission, it has good practical value.

关键词： image encryption improved baker transformation chaotic S-box chaotic sequence

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