每周的 ISEF 获奖论文解析来了！今天小助手邀请有方导师点评 2017年获奖课题，这篇论文的获奖学生是来自中国的团队，学科：Physics and Astronomy

When paraffin is placed on a heat source, a wisp of smoke forms. The project aims to discover some characteristics of this smoke and quantitatively explain them. First of all, the morphology of the airflow can be visualized by the smoke. Experiments show that the airflow generates four different shapes under different heat source temperatures; At a certain height, turbulence and horizontal circulations form. To quantitatively explain why the airflow takes on such morphology, this study derives the partial differential equations of the movement of air. Computer numerical solutions of the equations are consistent with experimental results. Therefore, the observed morphology of airflow is quantitatively explained.

In addition, experiments show that smoke particles often form stable dense-and-sparse stripes in the rising airflow. The distances between adjacent stripes are about 10^-3 meters. To explain the formation of stripes, this study takes the particle groups formed by a massive number of particles as basic units of investigation. By making use of mathematical statistics, the fluid-dynamic interactions between individual particles are transferred into equivalent additional pressures between particle groups, and equations for the movement of particle groups are derived. Computer numerical solutions of the equations show that particles do form stripes. The distances between adjacent stripes are about 10^-3 meters. Therefore, the project quantitatively explained the formation of stripes. Moreover, it provided an effective model for studying densely-populated particles in fluids and a possible explanation for the stripes observed in satellite cloud images. It also offered some insights into self-organization phenomena.

paraffin；smoke forms；airflow；stripes；self-organization phenomena

该课题基于石蜡受热后的成烟现象，通过物理实验和计算机所推导出的空气运动的偏微分方程，定量地解释了石蜡烟雾气流形态。并将粒子组作为基本单位，利用数值计算的方法统计分析出粒子组的运动方程，定量地解释了烟雾颗粒在上升气流中形成的稀疏条纹。该课题为流体的稠密颗粒研究提供了有效的模型，并为在卫星云图中观察到的条纹提供了可能的解释。此外，该课题还为自组织现象提供了一些相关的见解。

  2014 ISEF 获奖论文  

（ Physics and Astronomy  ）

通过研究鞭毛结构来治疗人类相关疾病

导师：加州大学洛杉矶分校 （ UCLA ）

• 博士就读于UCLA分子生物学专业。

• 本科期间获得全额奖学金资助参加多次国际学术交流项目。

• 参与大学生创新实验项目获得国家级，大学生挑战杯项目国家级等多项科研项目；

• 目前已经在Nature communication等顶级杂志上发表多篇学术论文，有着丰富的海外留学经验以及科研经验；

• 被UCLA选中担任experienced TA和TA的instructor来指导其他的研究生如何进行本科生和研究生的教学，有着丰富的教学和指导经验。

在教学过程中，每节课都有详细的课堂以及作业反馈。还有助教老师全程监督与辅导，使学习高效，学到更多知识。

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