The Brillouin gain properties in a double-clad As2Se3 photonic crystal fiber（PCF）are simulated based on the finite-element method（FEM）.The results indicate that the Brillouin gain spectrum（BGS）of our proposed ch...The Brillouin gain properties in a double-clad As2Se3 photonic crystal fiber（PCF）are simulated based on the finite-element method（FEM）.The results indicate that the Brillouin gain spectrum（BGS）of our proposed chalcogenide PCF exhibits a multipeaked behavior and has a high Brillouin gain coefficient.We also find that a larger size of inner cladding air holes will lead to a more pronounced second peak in the BGS.On the other hand,the size of the outer cladding has nearly no effect on the BGS behavior.Through these results,one can tailor the Stimulated Brillouin scattering effect in PCFs for a wide range of applications.展开更多
In the early 20th century,debate raged in China over whether to accept a deluge of Japanese loanwords现代汉语中的日语词汇,漂洋过海,落地开花When Nayuki,a popular Chinese bubble tea brand,changed a single character in i...In the early 20th century,debate raged in China over whether to accept a deluge of Japanese loanwords现代汉语中的日语词汇,漂洋过海,落地开花When Nayuki,a popular Chinese bubble tea brand,changed a single character in its name in December 2022,it was not just a cosmetic change.Amid a wave of political tension between China and Japan,the brand switched the Japanese characterの(pronounced“no”),which indicates possession,in its Chinese name(then,奈雪の茶)to的,the Chinese character with the same meaning.展开更多
生物炭负载零价铁复合材料作为一种兼具吸附和还原作用的高效新型修复材料被广泛应用于环境领域。基于Web of Science核心数据库,通过文献计量可视化应用软件CiteSpace,分析了2013—2022年生物炭负载零价铁复合材料应用于环境领域的研...生物炭负载零价铁复合材料作为一种兼具吸附和还原作用的高效新型修复材料被广泛应用于环境领域。基于Web of Science核心数据库,通过文献计量可视化应用软件CiteSpace,分析了2013—2022年生物炭负载零价铁复合材料应用于环境领域的研究热点及趋势。结果表明:生物炭负载零价铁复合材料的研究处于新兴发展阶段,相关文章数量总体呈逐年增长趋势,中国是发文总量最多的国家,且国际影响力最大。中国科学院是发文量最多的研究机构,其中介中心度也最高。来自中国科学院的陈梦舫和钱林波研究员及弗洛里达大学的Gao Bin教授是发文量最多的学者团队。经过近10年的发展,研究呈现出差异性倾向,也出现了不同的新兴研究前沿。由复合材料对污染水体中重金属和有机物等污染物的吸附与去除机制转向对环境微生物、温室效应的影响。研发新型生物炭负载零价铁复合修复材料;探索污染土壤中重金属、新型污染物及复合污染的修复去除机制;探究微生物群落及其功能基因的降解机理;阐明微生物与温室气体排放的调控机制可能是未来研究的热点及趋势。展开更多
Azimuthal variations in site response can provide a good insight into the site amplification and seismic conditions of geohazard occurrences.In this study,multiple directional site response methods,including D-Arias(D...Azimuthal variations in site response can provide a good insight into the site amplification and seismic conditions of geohazard occurrences.In this study,multiple directional site response methods,including D-Arias(Directional-Arias),D-SER(Directional-Shaking energy ratio),D-HVSR(Directional-Horizontal to vertical spectral ratio)and D-SSR(Directional–Standard spectral ratio),are adopted to analyse seismic data of the 2013 Lushan Ms 7.0 earthquake captured by the self-established Lengzhuguan(LZG)station which consists of the complex topography of isolated ridge,large mountain and some typical micro-reliefs.The results show that the isolated ridge could cause stronger site responses than the large mountain,and whose pronounced response direction is roughly perpendicular to its ridgeline.With the growth of elevation,the siteresonant frequency decreases.The different microreliefs on the mountain cause different site responses,which present as protruding slope>linear slope.The site response mainly exists on the surficial layer of the mountain and shows that with the increase of the distance to mountain surface,the site response gets weaker,the site resonant frequency gets higher,and the pronounced response direction is perpendicular to its ridgeline.展开更多
基金supported by the International Cooperation Projects between China and Singapore under Grant No.2009DFA12640
文摘The Brillouin gain properties in a double-clad As2Se3 photonic crystal fiber（PCF）are simulated based on the finite-element method（FEM）.The results indicate that the Brillouin gain spectrum（BGS）of our proposed chalcogenide PCF exhibits a multipeaked behavior and has a high Brillouin gain coefficient.We also find that a larger size of inner cladding air holes will lead to a more pronounced second peak in the BGS.On the other hand,the size of the outer cladding has nearly no effect on the BGS behavior.Through these results,one can tailor the Stimulated Brillouin scattering effect in PCFs for a wide range of applications.
文摘In the early 20th century,debate raged in China over whether to accept a deluge of Japanese loanwords现代汉语中的日语词汇,漂洋过海,落地开花When Nayuki,a popular Chinese bubble tea brand,changed a single character in its name in December 2022,it was not just a cosmetic change.Amid a wave of political tension between China and Japan,the brand switched the Japanese characterの(pronounced“no”),which indicates possession,in its Chinese name(then,奈雪の茶)to的,the Chinese character with the same meaning.
文摘生物炭负载零价铁复合材料作为一种兼具吸附和还原作用的高效新型修复材料被广泛应用于环境领域。基于Web of Science核心数据库,通过文献计量可视化应用软件CiteSpace,分析了2013—2022年生物炭负载零价铁复合材料应用于环境领域的研究热点及趋势。结果表明:生物炭负载零价铁复合材料的研究处于新兴发展阶段,相关文章数量总体呈逐年增长趋势,中国是发文总量最多的国家,且国际影响力最大。中国科学院是发文量最多的研究机构,其中介中心度也最高。来自中国科学院的陈梦舫和钱林波研究员及弗洛里达大学的Gao Bin教授是发文量最多的学者团队。经过近10年的发展,研究呈现出差异性倾向,也出现了不同的新兴研究前沿。由复合材料对污染水体中重金属和有机物等污染物的吸附与去除机制转向对环境微生物、温室效应的影响。研发新型生物炭负载零价铁复合修复材料;探索污染土壤中重金属、新型污染物及复合污染的修复去除机制;探究微生物群落及其功能基因的降解机理;阐明微生物与温室气体排放的调控机制可能是未来研究的热点及趋势。
基金supported by the National Natural Science Foundation of China(Grant No.41877235)the National Key Research and Development Program of China(Grant No.2017YFC1501000)+1 种基金China Postdoctoral Science Foundation(2020M673292)the National Science Funds for Creative Research Groups of China(Grant No.41521002)。
文摘Azimuthal variations in site response can provide a good insight into the site amplification and seismic conditions of geohazard occurrences.In this study,multiple directional site response methods,including D-Arias(Directional-Arias),D-SER(Directional-Shaking energy ratio),D-HVSR(Directional-Horizontal to vertical spectral ratio)and D-SSR(Directional–Standard spectral ratio),are adopted to analyse seismic data of the 2013 Lushan Ms 7.0 earthquake captured by the self-established Lengzhuguan(LZG)station which consists of the complex topography of isolated ridge,large mountain and some typical micro-reliefs.The results show that the isolated ridge could cause stronger site responses than the large mountain,and whose pronounced response direction is roughly perpendicular to its ridgeline.With the growth of elevation,the siteresonant frequency decreases.The different microreliefs on the mountain cause different site responses,which present as protruding slope>linear slope.The site response mainly exists on the surficial layer of the mountain and shows that with the increase of the distance to mountain surface,the site response gets weaker,the site resonant frequency gets higher,and the pronounced response direction is perpendicular to its ridgeline.
