摘要翻译:
来自新型冠状病毒空气传播感染的健康威胁已成为国际关注的突发公共事件。在持续的新冠肺炎疫情期间,疾病控制和预防中心建议人们保持至少200万的社交距离,以限制接触冠状病毒的风险。然而,实验数据表明,被感染的气溶胶和水滴被困在湍流喷气云中,可以传播到7到8米。我们提出了一个基于核物理类比的复杂气体云及其病原体病毒有效载荷的模型。我们发现,云的停止范围与膨胀的直径和密度的乘积成正比。我们用我们的喷气模型来确定湍流云中浮力流体的平均密度。与实验数据拟合得到$1.8<\Rho_p/\Rho_{\Rm空气}<4.0$,其中$\Rho_p$和$\Rho_{\Rm空气}$是喷气和空气的平均密度。我们证明了在极端寒冷或温暖的环境中,温度变化可能导致一个${\cal O}(\pm8\%)$效应。我们还证明了气溶胶和水滴可以在空气中悬浮数小时。因此,一旦喷气速度减慢,其一致性丧失,受感染气溶胶的最终传播就依赖于周围的气流和湍流。
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英文标题:
《A Physics Modeling Study of SARS-CoV-2 Transport in Air》
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作者:
Luis A. Anchordoqui, James B. Dent, Thomas J. Weiler
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最新提交年份:
2020
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分类信息:
一级分类:Physics 物理学
二级分类:Biological Physics 生物物理学
分类描述:Molecular biophysics, cellular biophysics, neurological biophysics, membrane biophysics, single-molecule biophysics, ecological biophysics, quantum phenomena in biological systems (quantum biophysics), theoretical biophysics, molecular dynamics/modeling and simulation, game theory, biomechanics, bioinformatics, microorganisms, virology, evolution, biophysical methods.
分子生物物理、细胞生物物理、神经生物物理、膜生物物理、单分子生物物理、生态生物物理、生物系统中的量子现象(量子生物物理)、理论生物物理、分子动力学/建模与模拟、博弈论、生物力学、生物信息学、微生物、病毒学、进化论、生物物理方法。
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一级分类:Quantitative Biology 数量生物学
二级分类:Other Quantitative Biology 其他定量生物学
分类描述:Work in quantitative biology that does not fit into the other q-bio classifications
不适合其他q-bio分类的定量生物学工作
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英文摘要:
The health threat from SARS-CoV-2 airborne infection has become a public emergency of international concern. During the ongoing coronavirus pandemic, people have been advised by the Centers for Disease Control and Prevention to maintain social distancing of at least 2 m to limit the risk of exposure to the coronavirus. Experimental data, however, show that infected aerosols and droplets trapped inside a turbulent puff cloud can travel up to 7 to 8 m. We propose a nuclear physics analogy-based modeling of the complex gas cloud and its payload of pathogen-virions. We show that the cloud stopping range is proportional to the product of the puff's diameter and its density. We use our puff model to determine the average density of the buoyant fluid in the turbulent cloud. A fit to the experimental data yields $1.8 < \rho_P/\rho_{\rm air} < 4.0$, where $\rho_P$ and $\rho_{\rm air}$ are the average density of the puff and the air. We demonstrate that temperature variation could cause an ${\cal O}(\pm 8\%)$ effect in the puff stopping range for extreme ambient cold or warmth. We also demonstrate that aerosols and droplets can remain suspended for hours in the air. Therefore, once the puff slows down sufficiently, and its coherence is lost, the eventual spreading of the infected aerosols becomes dependent on the ambient air currents and turbulence.
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PDF链接:
https://arxiv.org/pdf/2007.05410