检索结果-南通市图书馆

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

一种轴线倾斜的圆锥对数螺旋天线

微波学报 2024年第5期40卷 55-60,77页

作者：丁亮齐会颖赵菲肖科柴舜连国防科技大学电子科学学院长沙410073 西南电子电信技术研究所盲信号处理国家级重点实验室成都610041

在圆锥对数螺旋天线构建阵列时,当有效辐射区间距超过一个波长或单元辐射方向不一致时,会出现阵列天线性能下降的情况。本文提出一种轴线倾斜的圆锥对数螺旋天线,将圆锥对数螺旋天线结构连续地向一侧平移,能够在实现轴线倾斜的同时,辐... 详细信息

在圆锥对数螺旋天线构建阵列时,当有效辐射区间距超过一个波长或单元辐射方向不一致时,会出现阵列天线性能下降的情况。本文提出一种轴线倾斜的圆锥对数螺旋天线,将圆锥对数螺旋天线结构连续地向一侧平移,能够在实现轴线倾斜的同时,辐射结构依旧面向z轴方向。该天线的辐射保持沿z轴方向,具有“轴线倾斜,方向图少倾斜”的特点,可以解决圆锥对数螺旋天线阵列性能下降的问题。针对倾斜圆锥对数螺旋天线的复杂结构,给出了一种倾斜螺旋线展开方法,使天线可以用柔性印制电路板工艺加工。本文设计并加工了轴线倾斜20°的倾斜圆锥对数螺旋天线,实测方向图最大偏移11.8°,验证了该天线的有效性。

关键词：圆锥对数螺旋天线阵列宽带相位中心

同方期刊数据库

医学专业大学计算机课程思政建设:价值、原则与策略

在线全文

学校读者我要写书评

暂无评论

医学教育研究与实践 2024年第4期32卷 457-461页

作者：王晨齐惠颖北京大学医学人文学院健康信息管理系北京100191

开展医学类专业大学计算机课程思政建设是对“信息社会+‘新医科’”背景下医学复合型人才培养作出的积极回应。本研究提出了医学专业大学计算机课程思政的价值体现和建设原则,并基于此阐述开展该课程思政建设实施策略,即多层面挖掘思... 详细信息

开展医学类专业大学计算机课程思政建设是对“信息社会+‘新医科’”背景下医学复合型人才培养作出的积极回应。本研究提出了医学专业大学计算机课程思政的价值体现和建设原则,并基于此阐述开展该课程思政建设实施策略,即多层面挖掘思政元素、多渠道选取思政材料、多方式融入教学环节、多措施提升教师素养以及多维度开展思政评价等,以期为医学院校信息技术课程思政建设提供借鉴与参考。

关键词：课程思政医学专业大学计算机新医科信息社会

Enhancing cathode performance for CO2 electrolysis with Ce0.9M0.1O2-δ（M=Fe, Co, Ni） catalysts in solid oxide electrolysis cell

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第1期29卷 46-51,I0003页

作者： Zhidong Huang Zhe Zhao huiying qi Xiuling Wang Baofeng Tu Mojie Cheng Division of Fuel Cells Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Electrochemical conversion with solid oxide electrolysis cells is a promising technology for CO2 utilization and simultaneously store renewable *** this work,Ce0.9M0.1O2-δ(CeM,M=Fe,Co,Ni)catalysts are infiltrated into La0.6Sr0.4Cr0.5Fe0.5O3-δ-Gd0.2Ce0.8O2-δ(LSCr Fe-GDC)cathode to enhance the electrochemical performance for CO2 ***-LSCrFe-GDC cell obtains the best performance with a current density of 0.652 A cm^-2,followed by CeFe-LSCrFe-GDC and CeNi-LSCrFe-GDC cells with the value of 0.603 and 0.535 A cm^-2,respectively,about 2.44,2.26 and 2.01 times higher than that of the LSCrFe-GDC cell at1.5 V and 800℃.Electrochemical impedance spectra combined with distributions of relaxed times analysis shows that both CO2 adsorption process and the dissociation of CO2 at triple phase boundaries are accelerated by Ce M catalysts,while the latter is the key rate-determining step.

关键词： Solid oxide electrolysis cell Carbon dioxide conversion Doped ceria Distribution of relaxation times Electroreduction

Hybrid alternate projection algorithm and its application for practical conformal array pattern synthesis

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2012年第5期23卷 625-632页

作者： Fei Zhao Shunlian Chai huiying qi Ke Xiao Junjie Mao College of Electronic Science and Engineering National University of Defense TechnologyChangsha 410073P.R.China

Based on the fabricated 12-element cavity-backed microstrip sector cylinder array,a novel hybrid alternate projection algorithm（HAPA）,which combines analytical method with numerical techniques effectively,is proposed for synthesizing the pattern of practical conformal *** algorithm applies the variable direction aperture projection method with mutual coupling correction techniques to provide the good initial excitations of elements to the enhanced alternate projection algorithm（EAPA）.In order to do further optimization,which improves the convergent speed of the algorithm ***,the HAPA has been applied to the fabricated sector cylinder array with mutual coupling *** results of synthesized patterns,such as low sidelobe with null points formed pattern,beam scanning with low sidelobe pattern and the shaped beam pattern are *** demonstrates the validity of HAPA in practical conformal array synthesis.

关键词： conformal array alternate projection algorithm aperture projection method pattern synthesis mutual coupling

K-doped BaCo_(0.4)Fe_(0.4)Zr_(0.2)O_(3−δ) as a promising cathode material for protonic ceramic fuel cells

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第12期11卷 1988-2000页

作者： Peng qiU Bo LIU Lei WU huiying qi Baofeng TU Jian LI Lichao JIA School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Center for Fuel Cell Innovation School of Materials Science and EngineeringState Key Lab of Materials Processing and Die&Mound TechnologyHuazhong University of Science and TechnologyWuhan 430074China College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China

Slow oxygen reduction reaction(ORR)involving proton transport remains the limiting factor for electrochemical performance of proton-conducting *** further reduce the operating temperature of protonic ceramic fuel cells(PCFCs),developing triple-conducting cathodes with excellent electrochemical performance is *** this study,K-doped BaCo_(0.4)Fe_(0.4)Zr_(0.2)O_(3−δ)(BCFZ442)series were developed and used as the cathodes of the PCFCs,and their crystal structure,conductivity,hydration capability,and electrochemical performance were characterized in *** them,Ba_(0.9)K_(0.1)Co_(0.4)Fe_(0.4)Zr_(0.2)O_(3−δ)(K10)cathode has the best electrochemical performance,which can be attributed to its high electron(e^(−))/oxygen ion(O^(2−))/H^(+)conductivity and proton uptake *** 750℃,the polarization resistance of the K10 cathode is only 0.009Ω·cm^(2),the peak power density(PPD)of the single cell with the K10 cathode is close to 1 W·cm^(−2),and there is no significant degradation within 150 *** electrochemical performance and durability make K10 a promising cathode material for the *** work can provide a guidance for further improving the proton transport capability of the triple-conducting oxides,which is of great significance for developing the PCFC cathodes with excellent electrochemical performance.

关键词： proton transport proton-conducting cathode protonic ceramic fuel cells(PCFCs) triple-conducting hydration capability

Effect of the grain boundary character distribution on the sulfur corrosion behaviour and mechanisms of copper windings under different high temperatures

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

High Voltage 2024年第3期9卷 566-580页

作者： Xu Dai Yuan Yuan Jiang Zhou Guoyong Liu Tao Zhu huiying Xiang qi Yu Xue Gao Ruijin Liao State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina College of Materials Science and Engineering Chongqing UniversityChongqingChina Dongfang Electric Machinery Co. LtdDeyangChina

As a typical failure phenomenon in transformers,sulfur corrosion has garnered significant attention in the field of high-voltage *** boundary character distribution(GBCD)copper windings have been introduced to enhance sulfur corrosion resistance by slowing down intergranular *** this study,the sulfur corrosion behaviour and mechanisms of the GBCD copper windings under various temperatures were experi-mentally and theoretically *** show that GBCD can enhance the corrosion resistance of copper in liquid *** the increase in temperatures,the insulating properties of oil and papers in traditional copper windings experience notable degradation,while GBCD copper windings show more stable insulating *** addition,modelling of grain boundary energy indicates that the grain boundary structure of GBCD copper windings has a lower average interface energy of 0.170 eV/Å***-culations of reaction thermodynamics show that GBCD copper windings possess a higher failure temperature(135.2℃)and inhibition degree(activation energy)of the sulfur corrosion(32,557.62 J/mol),revealing the stability and enhanced sulfur corrosion resis-tance at elevated temperatures.

关键词： corrosion grain copper

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

基于多组学数据融合构建乳腺癌生存预测模型

数据分析与知识发现 2019年第8期3卷 88-93页

作者：齐惠颖江雨荷北京大学医学人文学院北京100191 北京大学医学部北京100191

【目的】更好地预测乳腺癌生存期,探索融合多种组学数据利用机器学习方法构建乳腺癌生存预测模型。【方法】通过对TCGA数据库中乳腺癌的基因表达、拷贝数变异、DNA甲基化和蛋白质表达4种组学数据的融合,使用随机森林算法建立预测模型。... 详细信息

【目的】更好地预测乳腺癌生存期,探索融合多种组学数据利用机器学习方法构建乳腺癌生存预测模型。【方法】通过对TCGA数据库中乳腺癌的基因表达、拷贝数变异、DNA甲基化和蛋白质表达4种组学数据的融合,使用随机森林算法建立预测模型。【结果】在测试数据集上该模型对乳腺癌分类预测的精确率为97.22%,召回率为98.13%。通过AUC值对比不同类型组合组学数据的预测性能,融合多组学数据的AUC值为0.8393,性能最好。【局限】由于样本数量的限制,模型普适性还有待进一步验证。【结论】融合多种组学数据构建乳腺癌预测模型是一种有效提高预测性能的方法。

关键词：组学数据融合随机森林乳腺癌生存预测

在线全文

学校读者我要写书评

暂无评论

基于EAP-TLS的WLAN安全认证

科技通报 2012年第10期28卷 25-27页

作者：齐惠英天津交通职业学院信息管理中心天津300110

安全可靠的认证机制是保证无线网络安全的重要手段,本文通过对802.1x/EAP-TLS技术的分析与研究,提出了具体的客户端与认证服务器之间实现双向身份认证的解决方案;给出了EAP-TLS协议的有限状态机设计,并在实际网络平台中完成系统的分析... 详细信息

安全可靠的认证机制是保证无线网络安全的重要手段,本文通过对802.1x/EAP-TLS技术的分析与研究,提出了具体的客户端与认证服务器之间实现双向身份认证的解决方案;给出了EAP-TLS协议的有限状态机设计,并在实际网络平台中完成系统的分析与实现。

关键词： EAP-TLS 认证 WLAN 状态机

一种基于主成分分析和模糊聚类的入侵检测方法

在线全文

学校读者我要写书评

暂无评论

科技通报 2012年第12期28卷 51-53页

作者：齐惠英天津交通职业学院信息管理中心天津300110

入侵检测数据集中含有大量高维数据和冗余信息,降低了数据挖掘过程的系统学习效率与响应速度。提出一种基于主成分分析和模糊聚类相结合的入侵检测方法PCA-FC,通过对高维数据的预处理及特征提取,减少样本数据维数,然后执行数据聚集的方... 详细信息

入侵检测数据集中含有大量高维数据和冗余信息,降低了数据挖掘过程的系统学习效率与响应速度。提出一种基于主成分分析和模糊聚类相结合的入侵检测方法PCA-FC,通过对高维数据的预处理及特征提取,减少样本数据维数,然后执行数据聚集的方法提取出评价规则,从而有效地减少了训练数据的变量和干扰项,提高了分类效率。

关键词：入侵检测主成分分析聚类特征抽取