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FRAME: femtosecond videography for atomic and molecular dynamics

Light(Science & Applications) 2017年第1期6卷 548-554页

作者： Andreas Ehn Joakim Bood Zheming Li Edouard Berrocal Marcus Aldén Elias Kristensson Division of Combustion Physics Department of PhysicsLund UniversityLund SE-22363Sweden

Many important scientific questions in physics,chemistry and biology require effective methodologies to spectroscopically probe ultrafast intra-and inter-atomic/molecular ***,current methods that extend into the femtosecond regime are capable of only point measurements or single-snapshot visualizations and thus lack the capability to perform ultrafast spectroscopic videography of dynamic single *** we present a laser-probe-based method that enables two-dimensional videography at ultrafast timescales(femtosecond and shorter)of single,non-repetitive *** method is based on superimposing a structural code onto the illumination to encrypt a single event,which is then deciphered in a post-processing *** coding strategy enables laser probing with arbitrary wavelengths/bandwidths to collect signals with indiscriminate spectral information,thus allowing for ultrafast videography with full spectroscopic *** demonstrate the high temporal resolution of our method,we present videography of light propagation with record high 200 femtosecond temporal *** method is widely applicable for studying a multitude of dynamical processes in physics,chemistry and biology over a wide range of time *** the minimum frame separation(temporal resolution)is dictated by only the laser pulse duration,attosecondlaser technology may further increase video rates by several orders of magnitude.

关键词： imaging techniques ultrafast photonics ultrafast spectroscopy videography

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Human blastomere rotation in early cleavage embryos is not associated with reduced implantation: Evidence from time-lapse videography

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Asian pacific Journal of Reproduction 2019年第6期8卷 297-298页

作者： Emma P Langdon Yan-he Liu Phillip L Matson Peter J Mark School of Human Sciences the University of Western AustraliaCrawleyWestern Australia 6009Australia School of Medical and Health Science Edith Cowan UniversityJoondalupWestern Australia 6027Australia Reproductive Medicine Center Tianjin United Family HospitalTianjinChina Fertility North Joondalup Private HospitalJoondalupWestern Australia 6027Australia

Dear Editor,Time-lapse videography of human embryos allows for the easy visualization of the embryos without removing them from the protective environment of the incubator[1],the measurement of various morphokinetic(quantitative)parameters[2],and the identification of abnormalities of growth(qualitative parameters)such as direct cleavage[3],reverse cleavage[4]and intercellular contact of blastomeres[5].

关键词： Human embryos Blastomere rotation Time-lapse videography

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Stakeholder Theory, Public Engagement, and Epistemic Injustice: The Case of Covid-19 Vaccine Hesitancy in Scotland's African, Caribbean, and Black Communities

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INTERNATIONAL JOURNAL OF DISASTER RISK SCIENCE 2024年第4期15卷 552-564页

作者： Adekola, Josephine U. Chia, Robert Univ Glasgow Adam Smith Business Sch Glasgow G11 6EY Scotland

The adoption of a stakeholder approach to public engagement within the public sector has been extensive. However, there remain critical gaps in the understanding of stakeholder participation arising from hidden disparities that contribute to unequal access to communication channels, information, and hence ultimately knowledge and decision making. The term "epistemic injustice" has been used to describe such inequality of access and consequently, the outcome that ensues. Epistemic injustice is much overlooked in stakeholder theory. This article shows how epistemic injustice can act as a barrier to effective stakeholder engagement and hence to successful public policy formulation and implementation. We use the case of vaccine hesitancy among Scotland's African, Caribbean, and Black (ACB) communities to illustrate this problem of unequal participation. The study drew on primary data involving 85 participants and secondary data sources from extant literature and explored salient factors shaping barriers to vaccine uptake during the recent pandemic. The findings demonstrate how the failure to grasp epistemic injustice undermines the effectiveness of the stakeholder approach, even with the most well-intentioned efforts. We argue that epistemic injustice is a critical barrier to effective stakeholder approaches.

关键词： Covid-19 vaccine hesitancy Epistemic injustice Public engagement Scotland Stakeholder theory PARTICIPATION videography MANAGEMENT POWER

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Influence of Laser-Induced Bubble Formation on Laser Chemical Machining

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Journal of Surface Engineered Materials and Advanced Technology 2020年第2期10卷 21-33页

作者： Marcel Simons Tim Radel Raj Shanta Kajsaravally Frank Vollertsen BIAS-Bremer Institut für angewandte Strahltechnik Bremen Germany Department of Communications Engineering Bremen Germany Faculty of Production Engineering-Mechanical Engineering & Process Engineering University of Bremen Bremen Germany

Laser Chemical Machining (LCM) is a non-conventional processing method, which enables very accurate and precise ablation of metallic surfaces. Material ablation results from laser-induced thermal activation of heterogeneous chemical reactions between electrolytes and a metallic surface. However, when processing metallic surfaces with LCM, large fluctuations in ablation quality can occur due to rising bubbles. The for-mation of bubbles during laser chemical machining and their influence on the ablation quality has not been investigated. For a more detailed investigation of the bubbles, ablation experiments on Titanium and Ce-ramic under different thermal process conditions were performed. The experiments were recorded by a high-speed camera. The evaluation of the video sequences was performed using Matlab. The resulting bubbles were analyzed regarding their size and frequency. The results show that boil-ing bubbles formed on both materials during processing. Titanium also produces smaller bubbles, which can be identified as process bubbles ac-cording to their size. Furthermore, it was found that undisturbed laser chemical ablation can be achieved in the presence of a boiling process, since both boiling bubbles and process bubbles were detected during machining within the process window.

关键词： Micro Machining Laser Micro Machining Laser Chemical Removal Nucleate Boiling Highspeed videography

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