检索结果-内蒙古大学图书馆

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

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)

来源：评论

学校读者我要写书评

暂无评论

基于遥感卫星的地形级地理场景更新方法研究

引用

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

来源：评论

学校读者我要写书评

暂无评论

Development of the CEPC booster prototype dipole magnets

引用

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

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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

来源：评论

学校读者我要写书评

暂无评论

Understanding the Mechanisms of Texture Evolution of a Fe-24Cr-22Ni-7Mo Super Austenitic Stainless Steel During cold Rolling and Annealing

引用

METALS AND MATERIALS INTERNATIONAL 2024年第10期30卷 2777-2790页

作者： Liao, Luhai dai, Shang Guo, Rui Yuan, xuwen Li, Fengguang Hubei Univ Automot Technol Sch Mat Sci & Engn Shiyan 442002 Peoples R China Hubei Univ Automot Technol Key Lab Automot Power Train & Elect Shiyan 442002 Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

In present study, the texture evolution during cold rolling and subsequent annealing of a Fe-24Cr-22Ni-7Mo super austenitic stainless steel was investigated, and new insights into the mechanisms of texture evolution were obtained. The results show that macrotexture evolution during cold rolling can be categorized into two stages. Below 33.3% cold reduction, the material form strong Goss, Copper, and S texture component due to dislocation plane slipping. Above 33.3% reduction, strong Brass, Goss, and Copper-Twin texture components are formed, accompanied by a decrease in Copper and S component content. Moreover, when the cold reduction reaches 66.6%, the strength of the gamma-fibre texture suddenly increases. This increase is attributed to the rotation of the Copper-oriented grains and the Copper-Twin-oriented grains in the lamellar twin region to {111}<121> and {111}<211> along < 011>//TD direction, respectively. It is significant to note that twinning plays a dominant role in the formation of the Brass-type texture in the super austenitic stainless steel at large deformation. Additionally, the annealing of cold deformed materials results in the formation of random and scattered recrystallization texture. This may be due to the small difference in deformation energy storage of grains with different orientations after austenite deformation.

关键词： Super austenitic stainless steel Texture Microstructure Rolling Annealing

来源：评论

学校读者我要写书评

暂无评论

Blended Tea Ameliorates T2DM via Modulation of Gut Microflora

引用

PLANT FOODS FOR HUMAN NUTRITION 2024年第4期79卷 851-859页

作者： Liu, Sui dai, Xinyue Zhao, Jinqi Zhang, xuwen Zhu, Mingzhi Wang, Kunbo Fu, Donghe Hunan Agr Univ Key Lab Tea Sci Minist Educ Changsha 410128 Hunan Peoples R China Hunan Agr Univ Natl Res Ctr Engn Technol Utilizat Funct Ingredien Changsha 410128 Hunan Peoples R China Hunan Agr Univ Coinnovat Ctr Educ Minist Utilizat Bot Funct Ingredients Changsha 410128 Hunan Peoples R China Hunan Agr Univ Key Lab Evaluat & Utilizat Gene Resources Hort Cro Minist Agr & Rural Affairs China Changsha 410128 Hunan Peoples R China

Increasing evidences suggest that type 2 diabetes mellitus (T2DM) is closely related to gut microflora dysbiosis, which can be improved by dietary intervention. Four natural plant products, including Cyclocarya paliurus, Fu brick tea, Ampelopsis grossedentata, and Lithocarpus litseifolius, were blended to form a blended tea product for obtaining the better flavor. The blended tea was also expected to have excellent pharmacological activity. Therefore, the ameliorative effect of blended tea on T2DM and underlying mechanisms were studied in this study. The results showed that the blended tea extract effectively attenuated the symptoms of glucose and lipid metabolism-related disorders in T2DM mice fed by high-fat and high-sucrose diet. Furthermore, blended tea extract intervention significantly attenuated gut microbiota dysbiosis, the abundance of bacteria such as Bacteroidetes and Firmicutes, which aid in the hydrolysis and utilization of carbohydrates, significantly increased, while the abundance of pathogenic bacteria such as Proteobacteria significantly decreased. Certain core microorganisms involved in energy metabolism, including Ruminococcaceae_UCG-005, Butyricimonas, Roseburia, Oscillibacter, [Eubacterium]_nodatum_group, Muribaculaceae, Prevotellaceae UCG 001, were also found to be improved by blended tea extract. Collectively, our results demonstrated that the blended tea may ameliorate T2DM through modulation of gut microflora. The blended tea may serve as novel functional drink for the treatment of T2DM and dysbiosis of gut microbiota.

关键词： Blended tea(1) T2DM(2) Gut microflora(3) Gut Microflora dysbiosis(4)

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

融合空洞卷积神经网络的语义SLAM研究

引用

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

来源：评论

学校读者我要写书评

暂无评论

Rosellichalasins A-H, cytotoxic cytochalasans from the endophytic fungus Rosellinia sp. Glinf021

引用

PHYTOCHEMISTRY 2024年 222卷 114103页

作者： Gu, Gan Hou, xuwen Xue, Mengyao Jia, Xiaowei Pan, Xiaoqian Xu, Dan dai, Jungui Lai, Daowan Zhou, Ligang China Agr Univ Dept Plant Pathol Beijing 100193 Peoples R China China Agr Univ Coll Plant Protect MOA Key Lab Pest Monitoring & Green Management Beijing 100193 Peoples R China Chinese Acad Med Sci & Peking Union Med Coll Inst Mat Med State Key Lab Bioact Subst & Funct Nat Med Beijing 100050 Peoples R China

Eight new cytochalasans rosellichalasins A-H ( 1 - 8 ), as well as two new shunt metabolites rosellinins A ( 9 ) and B ( 10 ) before intramolecular Diels-Alder cycloaddition reaction in cytochalasan biosynthesis, along with nine known cytochalsans ( 11 - 19 ) were isolated from the endophytic fungus Rosellinia sp. Glinf021, which was derived from the medicinal plant Glycyrrhiza inflata . Their structures were characterized by extensive analysis of 1D and 2D NMR as well as HRESIMS spectra and quantum chemical ECD calculations. The cytotoxic activities of these compounds were evaluated against four human cancer cell lines including HCT116, MDA-MB-231, BGC823, and PANC-1 with IC 50 values ranging from 0.5 to 58.2 mu M.

关键词： Glycyrrhiza inflata Rosellinia sp. Glinf021 Cytochalasins Rosellichalasins Rosellinins Cytotoxic activity

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：