检索结果-南通市图书馆

利用模糊识别算法分析冠状动脉造影图像中的血管结构

在线全文

学校读者我要写书评

暂无评论

计算机学报 2008年第1期31卷 170-175页

作者：江贵平周寿军南方医科大学生物医学工程学院广州510515 北京理工大学光电工程系北京100081

定性与定量地描述冠状动脉血管,很大程度依赖于造影图像中的血管结构识别结果.对此,该文提出了一种多特征模糊识别算法判别血管结构.实现过程中,首先通过图像预处理获得血管初始特征,然后利用一圆周探测器沿血管路径扫描并获取多种局部... 详细信息

定性与定量地描述冠状动脉血管,很大程度依赖于造影图像中的血管结构识别结果.对此,该文提出了一种多特征模糊识别算法判别血管结构.实现过程中,首先通过图像预处理获得血管初始特征,然后利用一圆周探测器沿血管路径扫描并获取多种局部测度;在定义各种局部测度的多特征模糊子集及其隶属度函数之后,通过构造模糊识别算子准确地判别血管的端、段、分支和交叉结构.该方法在仿真血管模型和多套实际冠状动脉造影图像上获得了较好的效果,对实际图像的结构识别平均正确率达到92.60%.

关键词：冠状动脉 X射线造影(XRA) 血管结构判别模糊识别算法

在线全文

学校读者我要写书评

暂无评论

大学高水平学科建设的“中国方案”

中南民族大学学报（人文社会科学版） 2021年第9期41卷 140-147页

作者：周守军中南民族大学教育学院湖北武汉430074

我国高水平学科建设主要指国家重点学科建设和世界一流学科建设。国家建立了高水平学科建设的政治纲领与管理体制,制定了高水平学科建设目标体系和制度体系,制定了具有中国特色的学科评价标准体系,将建设科技强国和高等教育强国作为高... 详细信息

我国高水平学科建设主要指国家重点学科建设和世界一流学科建设。国家建立了高水平学科建设的政治纲领与管理体制,制定了高水平学科建设目标体系和制度体系,制定了具有中国特色的学科评价标准体系,将建设科技强国和高等教育强国作为高水平学科发展的驱动力,不断促进学科水平向世界一流学科迈进。

关键词：大学学科建设重点学科一流学科

Effect of Phase Separation Size on the Properties of Self-healing Elastomer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第6期42卷 798-804页

作者： jun Xu Lei Zhu Xian-Qi Feng Cong Sui Wen-Peng Zhao shou-Ke Yan School of Chemical Engineering Qingdao University of Science&TechnologyQingdao266042China College of Engineering Yanching institute of TechnologyLangfang065210China Key Laboratory of Rubber-plastics Qingdao University of Science&TechnologyQingdao266042China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

Regulation of phase structure has been recognized as one of the most effective ways to fabricate self-healing polymers with high mechanical *** mechanical properties of the resultant polymers are certainly affected by the size of separated phase ***,the study on this aspect is absence,because it can hardly exclude the influence of variation in monomer proportion required for tuning the separated phase ***,we report the first study on tuning the phase size through reversible addition-fragmentation chain transfer(RAFT)polymerization without changing the proportion of *** expected,the size of separated phase has been successfully mediated from 15 nm to 9 nm by tuning the molecular weight of the chain transfer *** is found that the mechanical strength and the self-healing efficiency of the resultant polymers increase simultaneously with the decrease of phase *** study on the formation kinetics of hydrogen bonds reveals that the decrease of phase size can facilitate the re-bonding rate of hydrogen bonds,even if the migration of polymer chains is restricted.

关键词： Self-healing polymers Phase separation Reversible addition-fragmentation chain transfer

藏族习惯法司法适用的方式和程序研究——以四川省甘孜州地区的藏族习惯法为例

在线全文

学校读者我要写书评

暂无评论

现代法学 2012年第6期34卷 64-75页

作者：周世中周守俊广西师范大学法学院广西桂林541004

藏族习惯法是从藏族原始社会的习惯、禁忌、图腾崇拜及特定的宗教信仰发展衍生而来的一种行为规范,它是指藏民在日常生活中加以确认或制定,并通过部落组织赋予其强制力或法律效力,由藏区各部落强制保证实施并靠盟誓约定的方式调解部落... 详细信息

藏族习惯法是从藏族原始社会的习惯、禁忌、图腾崇拜及特定的宗教信仰发展衍生而来的一种行为规范,它是指藏民在日常生活中加以确认或制定,并通过部落组织赋予其强制力或法律效力,由藏区各部落强制保证实施并靠盟誓约定的方式调解部落内外关系的具有法律效力的社会规范。在四川省甘孜州地区,藏族习惯法在司法审判中仍然发挥其作用。我们应发挥其积极作用,限制其消极作用。

关键词：藏族习惯法司法审判法律实施

Interpretation and characterization of rate of penetration intelligent prediction model

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 582-596页

作者： Zhi-jun Pei Xian-Zhi Song Hai-Tao Wang Yi-Qi Shi shou-Ceng Tian Gen-Sheng Li College of Petroleum Engineering China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Petroleum Resources and Prospecting Beijing102249China Kunlun Digital Technology Co. Ltd.Beijing102206China

Accurate prediction of the rate of penetration(ROP)is significant for drilling *** the intelligent ROP prediction model based on fully connected neural networks(FNN)outperforms traditional ROP equations and machine learning algorithms,its lack of interpretability undermines its *** study proposes a novel interpretation and characterization method for the FNN ROP prediction model using the Rectified Linear Unit(ReLU)activation *** leveraging the derivative of the ReLU function,the FNN function calculation process is transformed into vector *** FNN model is linearly characterized through further simplification,enabling its interpretation and *** proposed method is applied in ROP prediction scenarios using drilling data from three vertical wells in the Tarim *** results demonstrate that the FNN ROP prediction model with ReLU as the activation function performs exceptionally *** relative activation frequency curve of hidden layer neurons aids in analyzing the overfitting of the FNN ROP model and determining drilling data *** the well sections with similar drilling data,averaging the weight parameters enables linear characterization of the FNN ROP prediction model,leading to the establishment of a corresponding linear representation ***,the quantitative analysis of each feature's influence on ROP facilitates the proposal of drilling parameter optimization schemes for the current well *** established linear characterization equation exhibits high precision,strong stability,and adaptability through the application and validation across multiple well sections.

关键词： Fully connected neural network Explainable artificial intelligence Rate of penetration ReLU active function Deep learning Machine learning

Development of lithium-free P2-type high-sodium content cathode materials with enhanced cycle and air stability for sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第1期43卷 113-123页

作者： Jin-Lv Tian Lin-Rong Wu Hai-jun Zhao shou-Dong Xu Liang Chen Ding Zhang Xiao-Chuan Duan College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China College of Chemistry Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430205China

The effect of partial substitution of Mg for Ni on a high-sodium and lithium-free layered P2-type Na_(45/54)Mg_(6)/_(54)Ni_(12/54)Mn_(34/54)O_(2) cathode with high initial Coulombic efficiency and excellent cyclic stability has been investigated in this *** on the crystal structural analysis,the Mg doping can retain the P2 structure up to 4.3 V,thus restraining the detrimental phase transformation of P2-02during the Na-ion intercalation/deintercalation ***,the obtained Mg-doped P2-type cathode exhibits a reversible specific capacity of 109 mAh·g^(-1) at 0.1C between 2.0 and 4.3 V and a retention rate of 81.5% after 200cycles at *** addition,the full cell consisting of Mg-doped P2-type cathode and hard carbon anode shows a capacity retention rate of 85.6% after 100 *** study provides new insight into the development of durable cathode materials for sodium-ion batteries.

关键词： Sodium-ion batteries Cathode material High sodium content Air stability

Interfacial DMI in Fe/Pt thin films grown on different buffer layers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第4期33卷 712-718页

作者：张文君魏菲刘冰周阳康仕寿孙兵 School of Physics and Electronic Information Weifang UniversityWeifang 261061China School of Physics and State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

We study the interfacial Dzyaloshinskii-Moriya interactions(i-DMI)of Fe/Pt bilayers grown on Si substrates with MgO,SiO_(2),or Ta each as a buffer layer on the basis of wave-vector-resolved Brillouin light scattering(BLS)*** obtained i-DMI energy values for Fe/Pt on MgO,Ta,and SiO_(2) buffer layers are 0.359,0.321,and 0.274 mJ/m~2,*** large i-DMI value observed in Fe/Pt system on the MgO buffer layer can be attributed to the good interfacial quality and the Rshaba effect at the MgO/Fe ***,the MgO/Fe/Pt system,benefiting from better sample quality,exhibits a lower damping ***,layer-resolved first-principles calculations are carried out to gain a more in-depth understanding of the origin of the i-DMI in the Fe/Pt *** results indicate that in the Fe(110)/Pt(111)system,the substantial DMI energy between Fe spins at the interface is related to a significant change in spin-orbit coupling(SOC)energy in the neighboring Pt *** contrast,for the MgO(002)/Fe(002)system,both the DMI and its related SOC energy are concentrated at the interfacial Fe *** investigation will provide a valuable insight into the spintronic community in exploring novel devices with chirality dependence.

关键词： Fe/Pt i-DMI BLS ferromagnetic resonance magnetic relaxation

Degradation of warm permafrost and talik formation on the Qinghai-Tibet Plateau in 2006-2021

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2024年第2期15卷 275-284页

作者： Qi-Hang MEI Ji CHEN You-Qian LIU shou-Hong ZHANG Jing-Yi ZHAO Tian-Chun DONG jun-Cheng WANG Yao-jun ZHAO Beiluhe Observation and Research Station of Frozen Soil Engineering and Environment Key Laboratory of Cryospheric Science and Frozen Soil EngineeringNorthwest Institute of Eco-Environmental and ResourcesChinese Academy of SciencesLanzhou 730000China China Railway Qinghai-Tibet Group Co.Ltd Xining 810007China University of Chinese Academy of Sciences Beijing 100049China

Permafrost is degrading globally,particularly those with low thermal stability on the Qinghai-Tibet Plateau,owing to climate ***,the inadequacy of direct research on permafrost degradation based on in-situ monitoring limits the prediction of permafrost degradation and engineering *** study explored the processes and modes of permafrost degradation into talik by analyzing ground temperature data from five points in the hinterland of the Qinghai-Tibet Plateau from 2006 to *** results showed that the degradation of the warm permafrost layer with a geothermal gradient of zero occurred simultaneously in the top and bottom *** rate of permafrost degradation from the top down and bottom up increase during the degradation process,but the increase of the former is more drastic after the formation of thawed ***,the construction of the Qinghai-Tibet Railway changed the degradation modes of the permafrost in adjacent natural sites through horizontal heat transfer,particularly after through talik formation under the *** findings suggest that taking countermeasures before or immediately after forming thawed interlayer is more *** evaluating the thermal impact of projects in warm permafrost regions,special attention should be given to the horizontal heat transfer process that may result from the formation of a through talik.

关键词： Warm permafrost Degradation Talik Qinghai-Tibet Plateau Climate change

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

医学图像轮廓跟踪的广义模糊粒子滤波方法

计算机学报 2005年第1期28卷 88-96页

作者：周寿军陈武凡王涌天第一军医大学医学图像全军重点实验室广州510515 北京理工大学信息工程学院光电工程系北京100081

在医学图像运动跟踪领域 ,轮廓线跟踪是描绘边缘运动的有力手段 .为避免观测噪声的影响 ,增加轮廓的时空局部约束并利用粒子滤波 (PF)技术解决该类跟踪问题是非常有效的 .为更好地优化计算PF的重要比率 (IR)以提高粒子滤波器的性能 ,该... 详细信息

在医学图像运动跟踪领域 ,轮廓线跟踪是描绘边缘运动的有力手段 .为避免观测噪声的影响 ,增加轮廓的时空局部约束并利用粒子滤波 (PF)技术解决该类跟踪问题是非常有效的 .为更好地优化计算PF的重要比率 (IR)以提高粒子滤波器的性能 ,该文提出了广义模糊粒子滤波 (GFPF)方法 ,通过与当前较好的无迹粒子滤波 (UPF)相比较 ,GFPF显示了很好的效果 ;另外 ,在似然估计方面 ,GFPF提供了独特的似然轮廓估计算法 .理论和试验证明 ,GFPF不仅能够很好地解决动态轮廓跟踪问题 ,还为当前各种PF算法的IR计算提供了全新的解决途径 .

关键词：无迹粒子滤波广义模糊粒子滤波试探分布重要比率似然估计