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2019 IEEE International Conferences on Ubiquitous Computing and Communications and Data Science and Computational Intelligence and Smart Computing, Networking and Services, IUCC/DSCI/SmartCNS 2019

作者： Pan, Zhuojin Wei, Xinlei dai, xuwen Luo, Zhen Shenyang Aerospace University Laboratory of Embedded Systems Shenyang China

ISBN: (纸本)9781728152097

Aiming at the problem that the semantic segmentation algorithm has poor segmentation results in large depth of field (DOF) images, this paper proposed the concept of depth IoU (dIoU) evaluation standard. This concept based on the effective generalized IoU-loss (GIoU-loss) and the instance-level IoU (iIoU) concept proposed by Cityscapes dataset in the field of target detection. This paper introduced the image depth information into the loss function in the semantic segmentation algorithm. By using dIoU as a evaluation standard, the detection effect of the distant object in the DOF picture will get more weight. It solves the problem of weight reduction caused by the far-reaching effect of the distant object in the traditional evaluation standard. © 2019 IEEE.

关键词： Semantic Segmentation

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High power input coupler development for BEPCII 500 MHz superconducting cavity

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2010年第3期623卷 895-902页

作者： Huang, Tongming Pan, Weimin Ma, Qiang Wang, Guangwei dai, xuwen Zhang, Zhanjun Furuya, T. Mitsunobu, S. Chinese Acad Sci Inst High Energy Phys Beijing 100049 Peoples R China KEK Tsukuba Ibaraki 3050801 Japan

A high power input coupler for a 500 MHz superconducting cavity (SCC) of the upgrade project of Beijing Electron Positron Collider (BEPCII) has been developed in China. Several prototypes have been fabricated and tested successfully. A maximum of 420 kW continuous wave (CW) RF power in traveling wave (TW) mode was achieved in the high power test. The detailed design, fabrication and test of the coupler are described in this paper. (C) 2010 Elsevier B.V. All rights reserved.

关键词： High power input coupler Superconducting cavity High power conditioning

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BEPCⅡ预安装准直测量方案设计

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核技术 2005年第4期28卷 253-257页

作者：王国峰屈化民戴旭文中国科学院高能物理研究所北京100049

北京正负电子对撞机重大改造工程(简称BEPCⅡ)是国家重大科学工程项目。BEPCⅡ的预安装准直测量采用SMX公司的激光跟踪仪,将BEPCⅡ储存环半个支架单元的B铁、S铁、Q铁和真空盒等设备安装到支架上,并对每个设备进行测量调整。经过坐标变... 详细信息

北京正负电子对撞机重大改造工程(简称BEPCⅡ)是国家重大科学工程项目。BEPCⅡ的预安装准直测量采用SMX公司的激光跟踪仪,将BEPCⅡ储存环半个支架单元的B铁、S铁、Q铁和真空盒等设备安装到支架上,并对每个设备进行测量调整。经过坐标变换,转化为B铁磁铁坐标系,更直观地表现了各个部件之间的相互关系。经过误差分析,确立了测量的精度和准确度。

关键词：预安装预准直坐标转换误差分析

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An Evaluation Standard and Loss Function Applied to the Semantic Segmentation of Large Depth of Field Pictures

An Evaluation Standard and Loss Function Applied to the Sema...

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IEEE International Symposium on Parallel and Distributed Processing with Applications and IEEE International Conference on Ubiquitous Computing and Communications (ISPA/IUCC)

作者： Zhuojin Pan Xinlei Wei xuwen dai Zhen Luo Shenyang Aerospace University Shenyang China

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Development of the CEPC booster prototype dipole magnets

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INTERNATIONAL JOURNAL OF MODERN PHYSICS A 2021年第22期36卷

作者： Kang, Wen Chen, Yuan Zhou, Jianxin Yang, Mei dai, xuwen Mu, Zhihui Guo, Runbing Chinese Acad Sci Inst High Energy Phys 19B Yuquan Rd Beijing 100049 Peoples R China

The CEPC booster will accelerate the e(-)e(+) beam from 10 GeV to 120 GeV, so the field of the dipole magnets will change with the beam energy, of which the minimal working field is 29 Gs whereas the maximal field is 338 Gs. To reach the requirement of high precision at lower field level, three kinds of new dipole magnets are proposed and studied. To test and verify the designs of the magnets, two subscale prototype magnets are fabricated.

关键词： CEPC dipole magnet high precision low field field errors reproducibility

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Research and development of the high precision low field dipole magnet for CEPC Booster

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JOURNAL OF INSTRUMENTATION 2024年第2期19卷 P02006页

作者： Kang, Wen Zhou, Jianxin Li, Yuhui dai, xuwen Guo, Runbing Mu, Zhihui Pan, Juntong Yang, Mei Chen, Fusan Chinese Acad Sci Inst High Energy Phys Beijing Peoples R China

In the Conceptual Design Report (CDR) stage of the Circular Electron and Positron Collider (CEPC), the injection energy of the Booster is 10 GeV and minimal working field of the dipole magnets is only 29 G, the magnets with iron cores could not meet the requirement of the field precision due to the remnant field. In the CEPC Technical Design Report (TDR) stage, the injection energy of the Booster is increased to 30 GeV and the minimal working field of the dipole magnets is raised to 95 G so that the influence of the remnant field becomes relatively small, the iron core dipole magnets can be used for the Booster. In this paper, the technical design of the CEPC Booster dipole magnets is described, the development and test of a full scale prototype pure dipole magnet are presented.

关键词： Acceleration cavities and superconducting magnets (high-temperature superconductor, radiation hardened magnets, normal-conducting, permanent magnet devices, wigglers and undulators) Instrumentation for particle accelerators and storage rings - high energy (linear accelerators, synchrotrons)

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融合空洞卷积神经网络的语义SLAM研究

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现代电子技术 2020年第22期43卷 152-156页

作者：潘琢金戴旭文魏鑫磊王传云沈阳航空航天大学计算机学院辽宁沈阳110136

为了解决传统视觉SLAM算法受动态环境因素影响较大、对设备的算力要求高的问题,该文提出一种融合ORB-SLAM2、语义标签以及全局性稠密光流法的视觉SLAM算法。该方法采用空洞卷积神经网络的语义分割模块为双目图像添加语义标签,识别物体... 详细信息

为了解决传统视觉SLAM算法受动态环境因素影响较大、对设备的算力要求高的问题,该文提出一种融合ORB-SLAM2、语义标签以及全局性稠密光流法的视觉SLAM算法。该方法采用空洞卷积神经网络的语义分割模块为双目图像添加语义标签,识别物体类别。再结合相邻帧间位置信息对图像的动态点进行剔除。最后使用Octo-map优化定位与建图,实现动态环境下地图的建立与实时更新。实验结果证明,该文提出的算法在动态环境下的特征点提取速度和质量相较传统视觉SLAM算法有一定提高。

关键词：语义SLAM 空洞卷积神经网络语义标签动态点剔除地图构建结果分析

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基于遥感卫星的地形级地理场景更新方法研究

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国土资源导刊 2023年第2期20卷 11-17页

作者：杨琪琳叶芬戴绪文龚景湖南省第一测绘院湖南长沙410119

地形级实景三维是城市级和部件级实景三维的承载基础。为探索地形级地理场景快速更新方法,本文提出利用高分七号卫星影像进行三维重建方法,更新地形级实景三维地理场景。选择湖南省长株潭三市交界处约1 800 km^(2)范围作为研究区域,利用... 详细信息

地形级实景三维是城市级和部件级实景三维的承载基础。为探索地形级地理场景快速更新方法,本文提出利用高分七号卫星影像进行三维重建方法,更新地形级实景三维地理场景。选择湖南省长株潭三市交界处约1 800 km^(2)范围作为研究区域,利用RPC参数进行平差,求解仿射模型参数和三维点坐标,同时使用多测合一、基础测绘等矢量数据作为轮廓特征约束,从而消除因噪声或匹配错误导致的高程异常,优化三维模型,提高地理场景精准度。研究结果表明,利用高分七号卫星影像更新地形级地理场景现势性更高、更真实,为地形级地理场景更新提供了一种高效、精准、低成本的途径。

关键词：高分七号卫星地形级实景三维地理场景三维重建

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100 MEV/100kw electron linear accelerator driver of the nsc kipt neutron source

100 MEV/100kw electron linear accelerator driver of the nsc ...

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4th International Particle Accelerator Conference, IPAC 2013

作者： Aizatskiy, M. Bezditko, O. Karnaukhov, I. Kushnir, V. Mitrochenko, V. Zelinsky, A. Gohar, Y. dai, xuwen Chi, Yunlong Deng, Chang Dong Hou, Mi Kong, XiangCheng Liu, Rong Liu, Weibin Ma, Chuangxin Pei, Guoxi Pei, Shilun Song, Hong Wang, Sheng Zhao, Jianbin Zhou, ZuSheng NSC KIPT Kharkov Ukraine ANL Chicago United States IHEP Beijing China

ISBN: (纸本)9783954501229

In NSC KIPT, Kharkov, Ukraine a neutron source based on a subcritical assembly driven by a 100MeV/100kW electron linear accelerator will be constructed. This neutron source is an USA (ANL)- Ukraine (KIPT) Joint project, and its accelerator will be designed and constructed by Institute of High Energy Physics (IHEP), China. The design and construction of such an accelerator with high average beam current and low beam power losses is a technical challenging task. In the paper, the main accelerator features and current status are under discussion.

关键词： Neutron sources

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Medium-temperature furnace baking of 1.3 GHz 9-cell superconducting cavities at IHEP

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SUPERCONDUCTOR SCIENCE & TECHNOLOGY 2021年第9期34卷 095005-095005页

作者： He, Feisi Pan, Weimin Sha, Peng Zhai, Jiyuan Mi, Zhenghui dai, xuwen Jin, Song Zhang, Zhanjun Dong, Chao Liu, Baiqi Zhao, Hui Ge, Rui Zhao, Jianbing Mu, Zhihui Du, Lei Sun, Liangrui Zhang, Liang Yang, Conglai Zheng, Xiaobing Chinese Acad Sci Inst High Energy Phys Beijing 100049 Peoples R China Chinese Acad Sci Inst High Energy Phys Key Lab Particle Accelerat Phys & Technol Beijing 100049 Peoples R China Chinese Acad Sci Ctr Superconducting RF & Cryogen Inst High Energy Phys Beijing 100049 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

Recently, heat treatment in the range of 250 degrees C-500 degrees C has been attempted with the aim of improving the quality factor (Q) of superconducting radio-frequency (SRF) cavities worldwide. Herein, medium-temperature (mid-T) furnace baking experiments were conducted at the Institute of High Energy Physics to obtain higher Q values. First, 1.3 GHz 1-cell cavities received mid-T furnace baking at different temperatures, resulting in not only the improvement of Q but also an anti-Q-slope behavior. Furthermore, mid-T furnace baking was applied to six 1.3 GHz 9-cell cavities, all of which indicated higher Q and anti-Q-slope behavior. The average Q was 3.8 x 10(10) at 16 MV m(-1). The maximum gradients of the 9-cell cavities were 22.7-26.5 MV m(-1). Finally, the mid-T furnace baked 1.3 GHz 9-cell cavities were welded with helium vessel, with no degradation in the vertical tests. In addition, the mid-T furnace baking process was simplified in comparison with European X-ray Free Electron Laser and Linear Coherent Light Source because of the cancellation of light electro-polishing. This simplification is beneficial in the mass production of SRF cavities with high Q, which are widely adopted in free electron lasers and high-energy colliders.

关键词： superconducting cavity quality factor gradient medium-temperature furnace baking vertical test

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