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Generating Baikal-GVD high energy cascade-like neutrino events with a GEANT4-based simulation toolkit

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Chinese Physics C 2024年第10期48卷 256-263页

作者： Zike Wang A.D.Avrorin zh.n Cao Mingjun Chen Peiyuan Chu zh.-A.M.Dzh.lkibaev Bo Gao Tianqi Huang Jiali Liu Ying Qi Xiaohao You D.N.Zaborov Key Laboratory of Particle Astrophysics Experimental Physics Division&Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Institute for Nuclear Research of the Russian Academy of Sciences Moscow 117312Russia TIANFU Cosmic Ray Research Center Chengdu 610213China School of Science Tibet UniversityLhasa 850000China

Using the GEANT4 and Cosmic Ray Monte Carlo(CRMC)software packages,we developed a new simulation toolkit for astrophysical neutrino *** configuring the Baikal-GVD detector and comparing the vertex position and direction of incident particles,as well as the channel-by-channel signals,to the events detected by Baikal-GVD,we successfully generated 13 high-energy cascade neutrino events with the *** analysis revealed a systematic offset between the reconstructed shower position and the true interaction position,with a distance close to the scale of the shower maximum of−0.54±1.29 *** achieved a good linear relationship between the photoelectron number of neutrino events obtained by simulation and the real data measured by *** simulation toolkit could serve as a reliable basis for studying the performance of astrophysical neutrino telescopes.

关键词： high-energy neutrino cascade event simulation Cherenkov

Parallel Techniques for Frame Synchronous Scrambler

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High Technology Letters 1995年第1期1卷 51-54页

作者： Xiaoru, zh. Lieguang, Z. Tsinghua Univ Beijing China

In high speed transmission system such as SDH,parallel scrambling technique is *** paper presents a method of expanding matrix,which makes the traditional ma-trix method capable of realizing parallel scramblers of any size.A novel method called delayoperator method is also described in this *** 8-bit parallel scrambling circuitry ofSDH has been realized with the two methods.

关键词： Parallel scramble Matrix method Delay operator method

Sonar Image Processing System for an Autonomous Underwater Vehicle(AUV)

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High Technology Letters 1995年第1期1卷 71-75页

作者： Wen, X. Yuling, W. Weiqing, zh. Academia Sinica Beijing China

Sonar image processing system is an important intelligent system of Autonomous Un-derwater *** on TMS320C30 high speed DSP,it is used to realize sonar imagecompression and underwater object detections including obstacle recognition in real *** paper,the software and hardware designs of this system are introduced and the experi-mental results are given.

关键词： Autonomous underwater vehicle Sonar image processing Digital signal processor

Studies of Optical Nonlinearity Behaviors of Ultrafine PbS Particles in Perfluorocarboxylated Cation-exchanged Films

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High Technology Letters 1995年第1期1卷 102-104页

作者： Xiaowen, zh. Xueping, L. Yuan, L. Xurui, X. Songbin, zh. Zongju, X. Yinghua, Z. Academia Sinica Beijing China

Ultrafine PbS particles with different sizes have been prepared in perfluorocarboxylated cation-exchanged films. The variation of PbS particle size was clarified by absorption spectra and TEM graphs. Time-resolved optical Kerr effects were measured by femtosecond pump-probe techniques. Optical Kerr effect response time was estimated to be less than 165 fs. A third-order optical nonlinearity of χ(3)10-12 esu for PbS particles was obtained and it was found that it increases with the decrease of particle sizes, showing the influence of quantum confined effect on optical nonlinear behaviour of ultrafine particles.

关键词： PbS Ultrafine particle Optical nonlinearity Optical Kerr effect

Soliton Transmission over 50Km at 2.5GHz Repetition Rate

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High Technology Letters 1995年第1期1卷 22-24页

作者： Shan, zh. Minyu, Y. Baoxi, X. Caiyun, L. Jinghui, L. Xin, J. Jiangde, P. Yizh., G. Binkun, zh. Tsinghua Univ Beijing China

A 2.5 GHz optical soliton transmission over 50km has been successfully achieved’for thefirst time in China by using erbium-doped fiber *** soliton pulse width is *** erbium-doped fiber amplifiers are pumped by InGaAs... 详细信息

关键词： Optical soliton Soliton transmission Soliton communication EDFA

Study on Single-fiber Pull-out Method for Evaluating Interfacial Strength in CFRP

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High Technology Letters 1995年第1期1卷 105-108页

作者： Yudong, H. zh.qian, zh. Lixun, L. Qiwei, L. Harbin Inst of Technology Harbin China

Single-fiber pull-out testing (SFPOT) methods are frequently used to evaluate the interfacial adhesion between fiber and matrix in composite materials. To make such pull-out measurements, however, the length of embedded fiber must be small enough so that the fiber does not break before it is pulled freely. This is difficult to achieve by conventional methods with fibers of small diameter, such as the carbon fibers. In this paper, a fiber pull-out experiment is described. Specialized apparatus in our laboratory, as well as this technique for sample preparation are discussed in detail. The interfacial shear strength of carbon fiber/resin matrix composites is analyzed quantitatively by using the finite-element method. The SFPOT system has been proved to be an available means for the study of interfacial properties for carbon fiber/resin matrix composites.

关键词： Carbon fiber Composite materials Interfacial shear strength Single-fiber pull-out

Designing a practical ATM Campus Network

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High Technology Letters 1995年第1期1卷 61-65页

作者： Bin, L. Yong, zh. Shiduan, Ch. Yan, M. Beijing Univ of Posts and Telecommunications Beijing China

A typical distributed ATM campus network——BUPT(Beijing University of Posts andTelecommunications)ATM Campus Network is presented in this *** network iscomposed of several small ATM switches in a distributed manner and will be connected tothe China Education and Research Network(CERNET).First,an architecture of BUPTATM Campus Network is *** the interworking and protocol conversion be-tween ATM network and existing 802.X LAN are ***,some of the typicalbroadband applications such as multimedia communications,virtual workgroups,remotevideo-teaching and LAN emulation are described.

关键词： ATM Campus network LAN CERNET Broadband services

Studies on Thermal Conductivity of Diamond Film

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High Technology Letters 1995年第1期1卷 91-94页

作者： Jingbiao, C. Hong, Ch. Jifa, zh. Dayan, B. Rongchuan, F. Univ of Science and Technology of China Hefei China

Diamond films were prepared by electron-assisted chemical vapor deposition (EACVD) system, and the thermal diffusivities of the films with or without substrate were studied by use of photothermal deflection (PTD) technique. The results show that less non-diamond component and larger crystalline size result in higher thermal conductivity of CVD diamond film. The influence of substrate on the measurement of thermal conductivity of the film was investigated, and a simple two-layer heat conduction model is given to account for the influence and used to draw the thermal conductivity of the film from the effective thermal diffusivity of film/substrate system.

关键词： Diamond film Photothermal deflection Thermal conductivity Substrate

贵州罗甸玉“麻点”和“草花”的物质组成及成因研究

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光谱学与光谱分析 2024年第11期44卷 3236-3243页

作者：张可轩于海燕柏鹤张予烨桂林理工大学地球科学学院广西隐伏金属矿产勘查重点实验室

选取带有“麻点”和“草花”花纹的贵州罗甸透闪石玉（罗甸玉）为研究对象，利用扫描电镜、电子探针和激光拉曼光谱仪测试技术，探讨罗甸玉中“麻点”和“草花”的物质组成和成因。测试结果表明：大的团块状“麻点”分布在部分方解石和... 详细信息

选取带有“麻点”和“草花”花纹的贵州罗甸透闪石玉（罗甸玉）为研究对象，利用扫描电镜、电子探针和激光拉曼光谱仪测试技术，探讨罗甸玉中“麻点”和“草花”的物质组成和成因。测试结果表明：大的团块状“麻点”分布在部分方解石和透闪石的交界处或透闪石晶界处，小的片状“麻点”分布在方解石或透闪石的小的孔洞中。“麻点”的扫描电镜能谱和电子探针成分分析结果表明其由铁氧化物组成，拉曼光谱特征峰显示为赤铁矿。“草花”呈“沙漠玫瑰”的团球状或无定形状存在于两种结构透闪石交界处或柱状、片状透闪石的边缘。“草花”的扫描电镜能谱和电子探针成分分析结果表明其为锰氧化物，拉曼光谱特征峰显示为钙锰矿(640、 356和287 cm-1)或水钠锰矿(636、 582和506cm-1)。依据带有“麻点”和“草花”花纹的罗甸玉的成分和结构特征可以推测：罗甸玉中大的团块状“麻点”是后期富含Fe的热液与透闪石玉成矿热液混染成矿，而小的片状“麻点”则由富Fe热液充填形成。“草花”周围呈浸染状的叶片状或柱状透闪石是由富Mn热液与透闪石玉成矿热液混合结晶形成Mn含量比较高的透闪石，后期富Mn热液运移到柱状或片状透闪石的边缘或裂隙处析出形成钙锰矿或水钠锰矿。

关键词：罗甸玉麻点草花成分微形貌