检索结果-南通市图书馆

Inactive Al^(3+)-doped La(CoCrFeMnNiAl_(x))_(1/(5+x))O_(3)high-entropy perovskite oxides as high performance supercapacitor electrodes

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第5期11卷 742-753页

作者： Meng GUO Yufeng LIU fengnian zhang Fuhao CHENG Chufei CHENG Yang MIAO Feng GAO Jun YU College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

A series of high-entropy perovskite oxides(HEPOs)La(CoCrFeMnNiAl_(x))_(1/(5+x))O_(3-δ)(x=0.4,0.5,0.6,and 0.7)have been synthesized by coprecipitation method combined with calcination process and explored as electrodes for *** crystal structure,microstructure,and elemental composition of HEPOs were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and energy-dispersive X-ray spectroscopy(EDS)in *** electrochemical properties of HEPOs as supercapacitor electrodes were *** specific capacitances of HEPOs(x=0.4,0.5,0.6,and 0.7)are 281.84,353.65,325.60,and 259.30 F/g at the current density of 1 A/g,*** 2000 cycles,the specific capacitances of HEPOs(x=0.4,0.5,0.6,and 0.7)remain 85.01%,88.61%,86.37%,and 91.25%,*** outstanding electrochemical properties can be attributed to the entropy-stabilized structure caused by mixed six cations in B-site and the Al^(3+)-doping suppressing active ion aggregation during charge-discharge *** research highlights the potential of HEPOs as electrodes for supercapacitors.

关键词： high-entropy oxides(HEOxs) perovskite structure Al3+-doping supercapacitors

Ti4+-incorporated fluorite-structured high-entropy oxide (Ce,Hf,Y,Pr,Gd)O_(2−δ): Optimizing preparation and CMAS corrosion behavior

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第11期11卷 1801-1814页

作者： Fuhao CHENG fengnian zhang Yufeng LIU Meng GUO Chufei CHENG Jiadong HOU Yang MIAO Feng GAO Xiaomin WANG College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Environmental barrier coatings(EBCs)with excellent chemical resistance and good high-temperature stability are of great significance for their applications in next-generation turbine *** this work,a new type of high-entropy fluorite-structured oxide(Ce_(0.2)Hf_(0.2)Y_(0.2)Pr_(0.2)Gd_(0.2))O_(2−δ)(HEFO-1)with different Ti^(4+)contents were successfully *** addition of Ti4+could be dissolved into a high-entropy lattice to maintain the structure stable,effectively reducing the phase formation temperature and promoting the shrinkage of bulk *** treatment experiments showed that all the samples remained a single phase after annealing at 1200–1600℃for 6 *** addition,high-entropy(Ce_(0.2)Hf_(0.2)Y_(0.2)Pr_(0.2)Gd_(0.2)Ti_(0.2x)O_(2−δ)demonstrated great resistance to calcium–magnesium–alumina–silicate(CMAS)thermochemical *** the content of Ti was increased to x=0.5,the average thickness of the reaction layer was about 10.5µm after being corroded at 1300℃for 10 *** study reveals that high-entropy(Ce_(0.2)Hf_(0.2)Y_(0.2)Pr_(0.2)Gd_(0.2)Ti_(0.2x)O_(2−δ)is expected to be a candidate for the next-generation EBC materials with graceful resistance to CMAS corrosion.

关键词： high-entropy ceramics(HECs) fluorite structure high-temperature stability calcium-magnesium-alumina-silicate(CMAS)corrosion

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

消费社会语境中的“广告神话学”

河南社会科学 2009年第5期17卷 159-161页

作者：张丰年河南财经学院河南郑州450002

"消费社会"已成为学界描述和揭示当代社会现象和进行大众文化研究的一项重要理论资源和工具,在消费社会的语境中,构建一种"广告神话学"的阅读模式,不啻是对罗兰·巴特《神话》一书的延伸细读,并且确能通过这种模式发现消费社会的内在逻... 详细信息

"消费社会"已成为学界描述和揭示当代社会现象和进行大众文化研究的一项重要理论资源和工具,在消费社会的语境中,构建一种"广告神话学"的阅读模式,不啻是对罗兰·巴特《神话》一书的延伸细读,并且确能通过这种模式发现消费社会的内在逻辑是经由符号性的操作而实现的,而广告的"神话"本质就是"去政治化"。

关键词：消费社会符号学 “神话学” “广告神话学”

调用伽玛函数实现变厚齿强度的概率可靠性调优计算

在线全文

学校读者我要写书评

暂无评论

传动技术 2010年第3期24卷 20-24,40页

作者：张枫念东风汽车传动轴有限公司

以往在作可靠性设计计算时都要查数表,才能得出可靠度值。如若直接计算其中的拉普拉斯函数太困难。但这种做法在可靠性调优计算是很不理想的,它会阻碍计算机的自动高效的调优计算。而现在在计算机上调用伽玛函数计算拉普拉斯函数,就能... 详细信息

以往在作可靠性设计计算时都要查数表,才能得出可靠度值。如若直接计算其中的拉普拉斯函数太困难。但这种做法在可靠性调优计算是很不理想的,它会阻碍计算机的自动高效的调优计算。而现在在计算机上调用伽玛函数计算拉普拉斯函数,就能实现变厚齿强度的可靠性调优计算。因为在变厚齿强度校核中,可以只需变动一个参数,即变动偏置距,就能改变安全系数和可靠度。用它来说明,调用伽玛函数实现可靠性调优计算,是最为恰当的例子。最后本文还对现在可靠性设计,如何建立在我们已积累了较多经验的强度校核基础上作探讨。

关键词：汽车转向器变厚齿设计计算

La(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3)钙钛矿高熵陶瓷粉体的制备及其电学性能

在线全文

学校读者我要写书评

暂无评论

无机材料学报 2021年第4期36卷 431-435页

作者：郭猛张丰年苗洋刘宇峰郁军高峰太原理工大学材料科学与工程学院太原030024

采用共沉淀法结合煅烧工艺制备La(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3)钙钛矿结构高熵陶瓷粉体,显著降低了材料的合成温度。采用不同手段对其进行物相及形貌表征,研究结果表明,当煅烧温度为800℃时,样品已经形成钙钛矿结构... 详细信息

采用共沉淀法结合煅烧工艺制备La(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3)钙钛矿结构高熵陶瓷粉体,显著降低了材料的合成温度。采用不同手段对其进行物相及形貌表征,研究结果表明,当煅烧温度为800℃时,样品已经形成钙钛矿结构,但有少量第二相;当煅烧温度为1000℃时,La(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3)陶瓷粉体形成了纯钙钛矿结构。以La(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3)为电极材料制成工作电极,采用三电极体系对工作电极进行电学性能测试,包括循环伏安(CV)及恒流充放电(GCD)测试,结果显示该电极材料在1 A/g电流密度下具有154.8 F/g的比容量;当电流密度增大到10 A/g时,该电极材料仍然能保持初始比容量的47%(73 F/g),说明La(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3)高熵陶瓷具有较好的倍率性能。

关键词：高熵陶瓷共沉淀相稳定比容量