We theoretically investigate the feasibility of reconstructing the transverse structures of femtosecond laser filaments in air by photoacoustic tomography.To simulate the emission and transmission of filament-induced ...We theoretically investigate the feasibility of reconstructing the transverse structures of femtosecond laser filaments in air by photoacoustic tomography.To simulate the emission and transmission of filament-induced ultrasonic signals more truly,a series of experimentally recorded cross-sectional images are used to simulate the initial pressure rise from multiple filaments(MFs).The aperture size and sensitivity of the detector was incorporated into the reconstruction algorithm.The results show that frequency of acoustic signals induced by MFs with maximum volumetric energy density~100 k J/m^(3)is about 2 MHz below.The initial spatial distribution of optical filaments can be clearly reconstructed with the back projection based algorithm.We recommend a PAT system with transducers of a lower central frequency and a stronger apodization working at a longer scanning radius can be used in photoacoustic image reconstruction of femtosecond laser multifilaments.This study demonstrates the feasibility of using photoacoustic tomography to reconstruct femtosecond multifilament images,which is helpful for studying the complex dynamic processes of multifilament and multifilament manipulation and is also valuable for the remote applications of laser filaments.展开更多
"Boudoir Lament" is regarded as a distinctive subgenre of classical Chinese poetry.This essay argues that some of Dickinson's poems are replete with the sensibility characteristic of "Boudoir Lament..."Boudoir Lament" is regarded as a distinctive subgenre of classical Chinese poetry.This essay argues that some of Dickinson's poems are replete with the sensibility characteristic of "Boudoir Lament" poetry.The "Boudoir Lament" resonance of her poetry,along with her seclusion and love story,activate Chinese readers' cultural memory to re-imagine her and re-mold her image with the Chinese flavor.Rewriting Dickinson in the way of "Boudoir Lament" is interwoven with the contemporary reconfirmation and reexamination of this emotional pattern.展开更多
Lament of a Northwestern Woman(Qin Fu Yin),composed by Wei Zhuang after the Huangchao uprising,is a long poem that showcases the sufferings of the civilians and embodies the people’s character of the poem,which is th...Lament of a Northwestern Woman(Qin Fu Yin),composed by Wei Zhuang after the Huangchao uprising,is a long poem that showcases the sufferings of the civilians and embodies the people’s character of the poem,which is the profound empathy and compassion of the poet towards the civilians’plight.The poem was written during the reign of Emperor Xizong of the Tang Dynasty in the year Gengmao(883 AD).2023 is also the year Gengmao,so this poem has existed for a remarkable 1140 years.For over a millennium,this long poem remained submerged in history until the opening of the Dunhuang Grottoes at the turn of the 20th century.The deep compassion and commiseration towards the underprivileged masses conveyed in this long poem are reminiscent of Du Fu’s renowned“Three Poems of Separation.”Moreover,it is widely believed that this poem foretells the decline of the Tang Dynasty.展开更多
Chinese poetry has exerted a great influence on American modernist poets,especially on William Carlos Williams(1883-1963).William Carlos Williams’The Widow’s Lament in Springtime shares some connections with Chinese...Chinese poetry has exerted a great influence on American modernist poets,especially on William Carlos Williams(1883-1963).William Carlos Williams’The Widow’s Lament in Springtime shares some connections with Chinese Boudoir poems in theme,image,and technique.This paper tends to discuss the influence of Chinese Boudoir poems on William Carlos Williams based on his creating of The Widow’s Lament in Springtime,which provides a new perspective for studying the communication of Chinese and American poetry.展开更多
Recently,2019 China Filament Weaving Industry Technology Innovation Seminar,hosted by China Filament Weaving Association and Huangmei County People’s Government,organized by Huangmei County Investment Promotion Cente...Recently,2019 China Filament Weaving Industry Technology Innovation Seminar,hosted by China Filament Weaving Association and Huangmei County People’s Government,organized by Huangmei County Investment Promotion Center and Hubei Huangmei Economic Development Zone Management Committee,supported by Jiangsu Niupai Textile Machinery Co.,Ltd.and Suzhou Sifang Technology Co.,Ltd.,was held in Huangmei County,Hubei Province.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.42105176)the National University of Defense Technology Independent Research Project(Grant No.ZK21-40)。
文摘We theoretically investigate the feasibility of reconstructing the transverse structures of femtosecond laser filaments in air by photoacoustic tomography.To simulate the emission and transmission of filament-induced ultrasonic signals more truly,a series of experimentally recorded cross-sectional images are used to simulate the initial pressure rise from multiple filaments(MFs).The aperture size and sensitivity of the detector was incorporated into the reconstruction algorithm.The results show that frequency of acoustic signals induced by MFs with maximum volumetric energy density~100 k J/m^(3)is about 2 MHz below.The initial spatial distribution of optical filaments can be clearly reconstructed with the back projection based algorithm.We recommend a PAT system with transducers of a lower central frequency and a stronger apodization working at a longer scanning radius can be used in photoacoustic image reconstruction of femtosecond laser multifilaments.This study demonstrates the feasibility of using photoacoustic tomography to reconstruct femtosecond multifilament images,which is helpful for studying the complex dynamic processes of multifilament and multifilament manipulation and is also valuable for the remote applications of laser filaments.
文摘"Boudoir Lament" is regarded as a distinctive subgenre of classical Chinese poetry.This essay argues that some of Dickinson's poems are replete with the sensibility characteristic of "Boudoir Lament" poetry.The "Boudoir Lament" resonance of her poetry,along with her seclusion and love story,activate Chinese readers' cultural memory to re-imagine her and re-mold her image with the Chinese flavor.Rewriting Dickinson in the way of "Boudoir Lament" is interwoven with the contemporary reconfirmation and reexamination of this emotional pattern.
文摘Lament of a Northwestern Woman(Qin Fu Yin),composed by Wei Zhuang after the Huangchao uprising,is a long poem that showcases the sufferings of the civilians and embodies the people’s character of the poem,which is the profound empathy and compassion of the poet towards the civilians’plight.The poem was written during the reign of Emperor Xizong of the Tang Dynasty in the year Gengmao(883 AD).2023 is also the year Gengmao,so this poem has existed for a remarkable 1140 years.For over a millennium,this long poem remained submerged in history until the opening of the Dunhuang Grottoes at the turn of the 20th century.The deep compassion and commiseration towards the underprivileged masses conveyed in this long poem are reminiscent of Du Fu’s renowned“Three Poems of Separation.”Moreover,it is widely believed that this poem foretells the decline of the Tang Dynasty.
文摘Chinese poetry has exerted a great influence on American modernist poets,especially on William Carlos Williams(1883-1963).William Carlos Williams’The Widow’s Lament in Springtime shares some connections with Chinese Boudoir poems in theme,image,and technique.This paper tends to discuss the influence of Chinese Boudoir poems on William Carlos Williams based on his creating of The Widow’s Lament in Springtime,which provides a new perspective for studying the communication of Chinese and American poetry.
文摘Recently,2019 China Filament Weaving Industry Technology Innovation Seminar,hosted by China Filament Weaving Association and Huangmei County People’s Government,organized by Huangmei County Investment Promotion Center and Hubei Huangmei Economic Development Zone Management Committee,supported by Jiangsu Niupai Textile Machinery Co.,Ltd.and Suzhou Sifang Technology Co.,Ltd.,was held in Huangmei County,Hubei Province.
