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single-pulse ultrafast real-time simultaneous planar imaging of femtosecond laser-nanoparticle dynamics in flames

Light(science & Applications) 2024年第10期13卷 2312-2320页

作者： Yogeshwar Nath Mishra Peng Wang Florian J.Bauer murthy s.gudipati Lihong V.Wang Caltech Optical Imaging Laboratory Andrew and Peggy Cheng Department of Medical EngineeringDepartment of Electrical EngineeringCalifornia Institute of Technology1200 East California BoulevardMail Code 138-78PasadenaCA 91125USA science Division Jet Propulsion LaboratoryCalifornia Institute of Technology4800 Oak Grove DrivePasadenaCA 91109USA Lehrstuhl für Technische Thermodynamik(LTT)and Erlangen Graduate school in Advanced Optical Technologies(sAOT) Universität Erlangen-NürnbergErlangen 91058Germany

The creation of carbonaceous nanoparticles and their dynamics in hydrocarbon flames are still debated in environmental,combustion,and material *** this study,we introduce single-pulse femtosecond laser sheetcompressed ultrafast photography(fsLs-CUP),an ultrafast imaging technique specifically designed to shed light on and capture ultrafast dynamics stemming from interactions between femtosecond lasers and nanoparticles in flames in a ***-CUP enables the first-time real-time billion frames-per-second(Gfps)simultaneous twodimensional(2D)imaging of laser-induced fluorescence(LIF)and laser-induced heating(LIH)that are originated from polycyclic aromatic hydrocarbons(PAHs)and soot particles,***,fsLs-CUP provides the real-time spatiotemporal map of femtosecond laser-soot interaction as elastic light scattering(ELs)at an astonishing 250 *** contrast to existing single-shot ultrafast imaging approaches,which are limited to millions of frames per second only and require multiple laser pulses,our method employs only a single pulse and captures the entire dynamics of laserinduced signals at hundreds of *** a single pulse does not change the optical properties of nanoparticles for a following pulse,thus allowing reliable spatiotemporal ***,we found that particle inception and growth are derived from *** essence,as an imaging modality,fsLs-CUP offers ultrafast 2D diagnostics,contributing to the fundamental understanding of nanoparticle’s inception and broader applications across different fields,such as material science and biomedical engineering.

关键词： pulse scattering dynamics

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Clinical-radiological-pathological correlation of cavernous sinus hemangioma: Incremental value of diffusion-weighted imaging

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World Journal of Radiology 2017年第8期9卷 330-338页

作者： Abhishek Mahajan Vedula Rajni Kanth Rao gudipati Anantaram Ashwin M Polnaya sandeep Desai Paresh Desai Rammohan Vadapalli Manas Panigrahi Department of Radio- diagnosis Tata Memorial Centre Department of Radiology Krishna Institute of Medical Sciences Department of Radiodiagnosis Clumax Imaging Department of Radiology Apollo Victor Hospital Department of Radiology Vijaya Diagnostics Department of Neurosurgery Krishna Institute of Medical Sciences

AIMTo elucidate the clinical, magnetic resonance imaging (MRI), pathological features of these lesions and asses the incremental value of diffusion-weighted imaging (DWI) in diagnosing them. METHODsFifteen consecutive patients (11 females and 4 males; mean age 40.93 years; age range 13-63 years) with cavernous sinus hemangiomas (CsH) who underwent examination between November 2008 and May 2016 were included for the analysis. MRI, clinical and surgical findings of each patient was retrospectively reviewed. DWI were also analysed and mean-apparent diffusion coefficient (ADC) value was calculated. Eleven patients underwent surgical removal of the lesion and 2 patients had biopsy only. Diagnosis of CsH was confirmed histologically in 13 patients. REsULTsEleven patients (73%) presented with headaches and 10 (66%) had cranial nerve involvement. Extra cavernous sinus extension was noted in 14 (94%). surgery was performed in 13 (87%) and post-operative radiation was given to 4 (28%) patients. Thirteen patients remained asymptomatic on follow up. Three conspicuous imaging features were highly suggestive of the diagnosis: Lack of diffusion restriction (100%), homogeneous hyperintensity on T2 weighted image sequences (93.3%) and intense post-contrast enhancement (100%). The mean ADC was 1.82 × 10sup>-3sup> ± 0.2186 cmsup>2sup>/s. CONCLUsIONT1-weighted hypointensity with homogeneous hyperintensity on T2-weighted sequences, intense enhancement and absence of hemosiderin within the lesion on GRE sequence favour the diagnosis. Facilitated diffusion on DWI differentiates CsH from other solid cavernous sinus lesions and significantly improves the diagnostic accuracy, a critical factor for planning surgery.

关键词： Cavernous sinus hemangioma Cavernous sinus Magnetic resonance imaging Diffusion weighted imaging

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太阳系中冰的科学

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国外科技新书评介 2014年第6期 6-6页

作者： murthy s. gudipati 郑耀昕不详中国科学院空间科学与应用研究中心

太阳系（包括卫星、柯伊伯带天体、彗星和巨行星）中冰的实验室研究和模拟的作用正在变得越来越重要。了解冰的表面的辐射过程、质点和辐射的穿透深度、表面和亚表面的化学、织构、物相、密度、导热性等只是许多有兴趣的问题中的几个例... 详细信息

太阳系（包括卫星、柯伊伯带天体、彗星和巨行星）中冰的实验室研究和模拟的作用正在变得越来越重要。了解冰的表面的辐射过程、质点和辐射的穿透深度、表面和亚表面的化学、织构、物相、密度、导热性等只是许多有兴趣的问题中的几个例子，而这些研究就是所谓“以地球为基地的实验室研究”。

关键词：太阳系科学冰柯伊伯带天体辐射过程穿透深度实验室表面

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