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Corrosion and electrochemical behavior of as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys in 5%NaCl aqueous solution

Progress in Natural Science:Materials International 2011年第4期21卷 314-321页

作者： Xin ZHANG~(1,2,3),Kui ZHANG~1,Xing-gang LI~1,Cong WANG~4,Hong-wei LI~(2,3),Chang-shun WANG~(2,3),Xia DENG~1 1.State Key Laboratory for Fabrication and Processing of Nonferrous Metals, beijing General research Institute for Nonferrous Metals,beijing 100088,china 2.beijing engineering research center for advanced manufacturing and evaluation of special vehicle parts,beijing 100072,china 3.Institute of Technology,beijing North vehicle Group Corporation,beijing 100072,china 4.Fengtai Military Representative Office,beijing Military Representative Office,PLA,beijing 100072,china [a] State Key Laboratory for Fabrication and Processing of Nonferrous Metals Beijing General Research Institute for Nonferrous Metals Beijing 100088 China [b] beijing engineering research center for advanced manufacturing and evaluation of special vehicle parts Beijing 100072 China [c] Institute of Technology Beijing North Vehicle Group Corporation Beijing 100072 China [d] Fengtai Military Representative Office Beijing Military Representative Office PLA Beijing 100072 China

The corrosion mechanism of the as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloy immersed in 5%NaCl aqueous solution was investigated by electrochemical test and *** electrochemical results indicate that the corrosion resistance of Mg-5Y-7Gd-1Nd-0.5Zr alloy in 5%NaCl aqueous solution gradually deteriorates with immersion time increasing from 2 h,24 h,60 h,to 108 h,which is consistent with the SEM observation of corrosion *** Cl-anion leads to the initiation and development of the corrosion pits,and Mg-5Y-7Gd-1Nd-0.5Zr alloy exhibits filiform type of attack under significant anodic control of magnesium solution *** corrosion potential becomes noble with increasing immersion time.

关键词： magnesium alloys Mg-5Y-7Gd-1Nd-0.5Zr corrosion electrochemical behavior

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Corrosion behavior of Mg-Y alloy in NaCl aqueous solution

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Progress in Natural Science:Materials International 2012年第2期22卷 169-174页

作者： Xin Zhang a,b,c,Kui Zhang a,Xia Deng a,Hongwei Li b,c,Yongjun Li a,Minglong Ma a,Ning Li b,c,Yanlong Wang b,c a State Key Laboratory for Fabrication and Processing of Nonferrous Metals,beijing General research Institute for Nonferrous Metals,beijing 100088,china b beijing engineering research center for advanced manufacturing and evaluation of special vehicle parts,beijing 100072,china c center of Technology,beijing North vehicle Group Corporation,beijing 100072,china [a] State Key Laboratory for Fabrication and Processing of Nonferrous Metals Beijing General Research Institute for Nonferrous Metals Beijing 100088 China [b] beijing engineering research center for advanced manufacturing and evaluation of special vehicle parts Beijing 100072 China [c] center of Technology Beijing North Vehicle Group Corporation Beijing 100072 China

The corrosion behavior of Mg-(0.25,2.5,5,8 and 15)Y alloys in 3.5wt.%NaCl aqueous solution was *** was found that the degree of corrosion deterioration increased with increasing immersion time up to 2 *** modes for the alloys with low and high content of Y element were general corrosion and pitting corrosion,respectively,and the threshold content for the corrosion mode change was 2.5%for the tested *** experimental results showed that the addition of Y refined the grain of the alloy,and the distribution,i.e.,continuous or not,of the Mg24Y5 phases had great effect on the corrosion rate and corrosion mode.

关键词： Mg-Y Corrosion Microstructure

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面向图像拼接检测的自适应残差算法

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中国图象图形学报 2024年第2期29卷 419-429页

作者：张玲穆文鹏陈北京南京信息工程大学数字取证教育部工程研究中心南京210044 南京信息工程大学江苏省大气环境与装备技术协同创新中心南京210044 南京信息工程大学计算机学院南京210044

目的恶意的图像拼接篡改给名誉、法律、政治等带来一系列的挑战,而现有的图像拼接检测算法通常采用参数固定的高通滤波器提取滤波特征进行预处理,没有考虑图像之间的差异。方法本文设计自适应残差模块(adaptive residuals module, ARM... 详细信息

目的恶意的图像拼接篡改给名誉、法律、政治等带来一系列的挑战,而现有的图像拼接检测算法通常采用参数固定的高通滤波器提取滤波特征进行预处理,没有考虑图像之间的差异。方法本文设计自适应残差模块(adaptive residuals module, ARM)凸显拼接篡改痕迹,将卷积运算后的残差多次拼接,且每次拼接后再利用注意力机制实现通道间的非线性交互。然后,使用通道注意力SE(squeeze and excitation)模块以减少由ARM提取残差特征产生的通道之间信息冗余,并以在图像分类领域获得卓越性能的EfficientNet(high-efficiency network)为骨干网络,提出一种新的图像拼接检测算法。结果实验结果表明,所提算法在CASIA I(CASIA image tampering detection evaluation database),CASIA II,COLUMBIA COLOR,NIST16(NIST special database 16)和FaceForensic++这5个公开数据集上分别取得98.95%,98.88%,100%,100%,88.20%的检测准确率,获得比现有算法更高的准确率。提出的ARM将骨干网络EfficientNet在CASIA II数据集的准确率提高了3.94%以上。结论提出的基于自适应残差的图像拼接检测算法充分考虑图像之间的差异,凸显篡改区域与未篡改区域之间的区别,并获得更好的拼接检测结果。

关键词：图像取证深度神经网络图像拼接检测自适应残差 EfficientNet

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Eco-economic evolution, emergy evaluation and policy options for the sustainable development of Tibet

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Journal of Geographical Sciences 2000年第1期10卷 1-27页

作者： YAN Mao-chao, H. T. Odum ( Commission for Integrated Survey of Natural Resources, Chinese Academy of Sciences, beijing, china, center for Environmental Policy, Department of Environmental engineering Sciences, University of Florida, Gainesville, FL, USA)

As economies and ecological support systems become more interdependent, new disciplines are needed to 'bridge the gap' of understanding between societies and nature. It is now clear that neither ecology nor economics alone can address the problems of our global commons. New measures of wealth, of value, of contributions and production are needed that acknowledge the 'natural capital' and 'ecosystem services' provided from healthy environments. A new interface is now being recognized termed 'eco-economics'. It is an ambitious and necessary attempt to understand the affairs of humanity and nature as a single, interdependent system. New tools are being invested to measure wealth. services and production fairly and equitably. In this report we use systems analysis approach to study the combined ecological-economic system of Tibet We use an alternative measure of value, based on real contributions to system performance, termed EMERGY, spelt with an 'M'. It is an accounting unit of total contributions, direct and indirect. used in generating a product or service. It is a concept derived from understanding whole systems, their interactions and interdependence, and the resources driving and maintaining them. This broader approach will help us to investigate Tibetan resources utilization and potentialities and exchange. Emergy analysis allows comparison and incroporation of environmental costs and benefits with variables of traditional economic costs and benefits to provide a more comprehensive perspective for public policy directives. Through this research, we think: 1) china has made a great effort in making Tibet develop from a closed regional system to a more and more opened regional system which is very important to the sustainable development of Tibet. 2) The increase of economic development and population growth has a close relationship with the total emergy storage and use in transportation. Education in modern science and technology increased the shared emergy of Ti

关键词： emergy eco-economic evolution sustainable development

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Reliability Analysis Study of Digital Reactor Protection System in Nuclear Power Plant

Reliability Analysis Study of Digital Reactor Protection Sys...

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International Symposium on Future I&C for Nuclear Power Plants Cognitive Systems engineering in Process Control International Symposium on Symbiotic Nuclear Power Systems(ICI2011)

作者： GUO Xiao-ming~1,LIU Tao~(1,2),TONG Jie-juan~(1,2),ZHAO Jun~(1,2) 1.Institute of Nuclear and New Energy Technology,Tsinghua University,100084,beijing,china 2.Institute of Nuclear and New Energy Technology,Tsinghua University State Nuclear Power Technology research & Development center,100084,beijing,china

The Digital I&C systems are believed to improve a plant’s safety and reliability *** reliability analysis of digital I&C system has become one research *** fault tree method is one of means to quantify the digital I&C system *** of advanced nuclear power plant AP1000 digital protection system evaluation makes clear both the fault tree’s application and analysis process to the digital system reliability. One typical digital protection system special for advanced reactor has been developed,which reliability evaluation is necessary for design *** typical digital protection system construction is introduced in the paper,and the process of FMEA and fault tree application to the digital protection system reliability evaluation are *** data and bypass logic modeling are two points giving special attention in the *** the factors about time sequence and feedback not exist in reactor protection system obviously,the dynamic feature of digital system is not discussed.

关键词： DIGITAL I&C RELIABILITY FMEA FAULT TREE

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考虑供需随机性的道路交通系统震害引发损失期望评估

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世界地震工程 2003年第1期19卷 25-30页

作者：陈艳艳王光远北京工业大学交通工程研究所北京100022 哈尔滨工业大学土木工程学院黑龙江哈尔滨150090

借鉴可靠度理论,通过震后交通需求及道路震后通行能力的随机性分析并考虑灾后不同阶段的交通供需特性,进行交通系统震后阻塞发生的概率分析及引发损失期望预测,从而为抗震加固决策及震后交通管理及修复提供依据。

关键词：道路交通系统震害阻塞概率地震引发损失期望铁路抗震加固震后应急系统

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Clinical practice guideline for body composition assessment based on upper abdominal magnetic resonance images annotated using artificial intelligence

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Chinese Medical Journal 2022年第6期135卷 631-633页

作者： Han Lv Mengyi Li Zhenchang Wang Dawei Yang Hui Xu Juan Li Yang Liu Di Cao Yawen Liu Xinru Wu He Jin Peng Zhang Liqin Zhao Rixing Bai Yunlong Yue Bin Li Nengwei Zhang Mingzhu Zou Jinghai Song Weibin Yu Pin Zhang Weijun Tang Qiyuan Yao Liheng Liu Hui Yang Zhenghan Yang Zhongtao Zhang National Clinical research center for Digestive Diseases in beijing Friendship Hospital,Capital Medical University beijing Quality Control and Improvement center of Medical Imaging National Health Commission Capacity Building and Continuing Education center,Chinese College of Metabolic and Bariatric Surgeons beijing Quality Control and Improvement center of Metabolic and Bariatric Surgery Department of Radiology Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China Department of General Surgery Beijing Friendship HospitalCapital Medical University&National Clinical Research Center for Digestive DiseasesBeijing 100050China School of Biological Science and Medical engineering Beihang UniversityBeijing 100191China Department of Radiology Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China Department of General Surgery Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China Department of MR Beijing Shijitan HospitalCapital Medical University/Peking UniversityNinth Clinical Medical CollegeBeijing 100038China Department of General Surgery Beijing Shijitan HospitalCapital Medical University/Peking UniversityNinth Clinical Medical CollegeBeijing 100038China Department of Radiology Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical SciencesBeijing 100730China Department of General Surgery Beijing HospitalNational Center of GerontologyInstitute of Geriatric MedicineChinese Academy of Medical SciencesBeijing 100730China Department of Radiology Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai 200233China Department of Bariatric and Metabolic Surgery Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai 200233China Department of Radiology Huashan HospitalFudan UniversityShanghai 200040China center for Obesity and Metabolic Surgery Huashan HospitalFudan UniversityShanghai 200040China Department of Radiology Zhongshan HospitalFudan UniversityShanghai 200032China Department of Radiology The Second Affiliated Hospital of Shandong First Medical UniversityTai'anShandong 271000China 不详

Introduction Upper abdominal magnetic resonance(MR)imaging is appropriate for body composition analysis.111 Especially for individuals with obesity,it is of great value to quantify the hepatic proton density fat fraction(PDFF)and the amount of abdominal adipose tissue during clinical evaluation and for research on obesity-related *** results may be used to determine the optimal choice of surgical procedure and evaluate treatment *** artificial intelligence(Al)algorithms and systems have been developed for the automated measurement of body *** basis of Al development and application is to have uniform standards for clinical data acquisition and *** uneven quality ofMR images is one ofthe major obstacles to Al system development and analytical results.A standardized process of MR scanning and clinical data management is urgently needed.

关键词： abdominal obesity artificial

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THE evaluation OF LEVELING CONTROL OF PADDY FIELD LEVELER BASED ON ULTRASONIC SENSORS

THE EVALUATION OF LEVELING CONTROL OF PADDY FIELD LEVELER BA...

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亚洲精细农业与计算机农业应用联合大会

作者： Hu Lian 1 2 Luo Xiwen 1 2 Zhao Zuoxi 1 2 Li Qing 1 2 Chen Weitong 1 2 (1 Key Laboratory of Key Technology on Agricultural Machine and Equipment Ministry of Education. South china Agricultural University Guangzhou 510642 china 2. College of engineering South china Agricultural University Guangzhou 510642 china

Rice growing demands quite level fields due to its special growth requirements. When a tractor travels in a paddy field, the unevenness of the ground will cause roll angles. A paddy laser leveler was developed by South china Agricultural University and the leveler features a specially leveling harrow which could turn from side to side by a cylinder. In order to estimate the leveling control system of paddy field leveler, the inclination of the harrow was measured using two SensComp 600 ultrasonic sensors. The ultrasonic sensors were fitted on the harrow’s two ends, respectively, each measuring the distance from ground, which acted as reference plane, to calculate the inclination angle. It was found that using two ultrasonic sensors would provide accurate inclination information of the harrow even when at non-right angles to the floor, and sensor in movement. The angles measured was compared with data from an attitude-heading reference system AHRS500GA-226 device used as a reference, the results showing that the calculated inclination was quite accurate: the maximum static-error and maximum dynamic-error were 0.08°and 1°respectively. Finally, estimation experiments were done in laboratory. Based on the evaluation results, it was concluded that the leveling control system measured inclination in real-time and precisely, the maximum error less than 1°, and the whole leveling system works reliably.

关键词： Paddy Field Leveler Ultrasonic Sensor Distance Measurement Inclination Leveling Control

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石油及天然气储备库安全保障技术现状及展望

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油气储运 2018年第3期37卷 241-247页

作者：董绍华张行中国石油大学(北京)机械与储运工程学院中国石油大学(北京)管道技术与安全研究中心

为了提高石油及天然气储备库事故防控及管理水平,保障国家公共安全,国家重点研发计划"公共安全风险防控与应急技术装备"重点专项中设立了"国家石油及天然气储备库安全保障技术与装备研发"项目。该项目面向石油及天然气储备库安全保障需... 详细信息

为了提高石油及天然气储备库事故防控及管理水平,保障国家公共安全,国家重点研发计划"公共安全风险防控与应急技术装备"重点专项中设立了"国家石油及天然气储备库安全保障技术与装备研发"项目。该项目面向石油及天然气储备库安全保障需求,重点围绕天然气储备库设施致灾机理、设计建造、检测检验、安全评定、风险评价、应急技术与装备、安全保障一体化平台等关键科学与技术问题,开展理论研究、技术攻关、装备研制及应用示范,建立石油及天然气储备库设施安全保障技术体系,从而全面提升石油及天然气储备库公共安全管理水平。

关键词：石油及天然气储备库检验评价

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高硬度薄壁齿圈制造技术研究

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机械设计与制造 2018年第8期 116-118页

作者：刘珍妮王会龙李宏伟刘心藜北京北方车辆集团有限公司工艺技术中心北京100072 北京市特种车辆部件先进制造与评估工程技术中心北京100072

机电复合传动系统中的典型零件薄壁齿圈径向尺寸大,精度要求高,硬度高,加工难度大,为解决上述问题,文中以薄壁齿圈为例,分析了薄壁齿圈特殊结构以及加工过程中的难点和变形因素,跟据零件特点,设计工艺方案并通过具体的加工试验结果,得... 详细信息

机电复合传动系统中的典型零件薄壁齿圈径向尺寸大,精度要求高,硬度高,加工难度大,为解决上述问题,文中以薄壁齿圈为例,分析了薄壁齿圈特殊结构以及加工过程中的难点和变形因素,跟据零件特点,设计工艺方案并通过具体的加工试验结果,得出合理的加工方案,优化加工工艺。在此基础上设计精插齿夹具,减小硬齿面插齿时的变形,设计新型刀具,提高薄壁齿圈的加工质量和精度,通过大量加工试验,表明了此工艺的可行性,为此类零件加工积累了一定经验。

关键词：机电复合薄壁齿圈硬齿面变形硬齿面插齿刀

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