學術演講


<專題討論>2020/3/26(四)14:10綜合大樓2樓48218教室演講 : Dr. Nima Bolouki(明志科技大學電漿與薄膜科技中心)

張貼者:2020年3月19日 下午11:26Dabby Lu

講題: Laser and Optical Diagnostics Systems for Plasmas: Industrial Plasmas and Laboratory Space Science
摘要: Plasma diagnostics tools play an essential role in measurements of plasma parameters. The diagnostics tools are widely employed in various plasmas to measure electron density, electron energy distribution function, particle density, electric field, and so on. Moreover, diagnosing plasmas allows us to follow practical observations of physical processes inside the plasmas. This seminar will introduce the basic concepts of spectroscopic methods as one of the most powerful diagnostics tools. The experimental techniques associated with optical emission spectroscopy and laser-aided diagnostics will be presented. Finally, the results of laser Thomson scattering measurements will be explained in two different areas of plasmas in terms of temperature and density: low-temperature industrial plasmas and high energy plasmas which appear as laser-produced plasmas in laboratory space science.

<專題討論>2020/3/19(四)14:10綜合大樓2樓48218教室演講 : 林哲信 教授(中山大學機械與機電工程學系)

張貼者:2020年3月16日 上午2:26Dabby Lu

講題: 常壓電漿整合質譜於生醫與農藥之應用

<專題討論>2020/3/12(四)14:10綜合大樓2樓48218教室演講 : 趙修武 教授 (臺灣大學工程科學及海洋工程學系)

張貼者:2020年3月5日 下午10:46Dabby Lu

講題: MAGNETOHYDRODYNAMIC MODELING OF THERMAL PLASMA FLOW AND ITS APPLICATION TO DIRECT-CURRENT PLASMA TORCH
摘要: Direct-current plasma torch is a widely adopted thermal plasma device applied to various industrial applications, where high-temperature plasma jets are produced due to the substantial interaction between neutral working gases and arc columns. The applied electric arc principally works as the main energy provider to accelerate the plasma flow along with elevating its temperature to obtain the required processing capabilities. A steady magnetohydrodynamic model is proposed to describe the thermal plasma flow of a direct-current plasma torch where the continuity, momentum and energy equations incorporated with a turbulence model are considered to depict the dependence among the flow velocity, working pressure and gas temperature of the plasma jet subjected to an applied electric accompanied by a self-induced magnetic field. The azimuthal velocity component is also considered in the proposed model for capturing the significant rotational motion of plasma flow as a consequence of tangential inflow design. The thermal plasma is assumed electrically neutral, optically thin and in local thermal equilibrium. The time-averaged solution is employed because of a focus on engineering operation. For reactive thermal plasmas, the transport equations of charged particles described by a drift-diffusion approximation as well as the transport equations of the neutral species are modeled following the chemical and plasma kinetics among different plasma components. The energy balance equation of electron is furthermore introduced when the non-thermal equilibrium plasma is considered. The governing equations are segregated solved on a Cartesian grid via a finite volume discretization, where a linear parallelization is achieved through the MPI library. The proposed numerical scheme is implemented in an in-house code PTCAX. Several applications of the direct-current plasma torch are discussed to disclose the complex physics of thermal plasma flow interacting with a direct-current arc.

Keywords: Magnetohydrodynamic Modeling, Thermal Plasma, Direct-Current, Plasma Torch.

2019/11/29(五)13:00綜合大樓1樓48111B教室演講 : 張滋芳 博士(成功大學前瞻電漿研究中心)

張貼者:2019年11月27日 下午11:49Dabby Lu

講題: ERG Project and Development of SPEDAS
摘要: The ERG (Exploration of energization and Radiation in Geospace) project explores the acceleration, transport, and loss of relativistic electrons in the radiation belts. Radiation belts are regions of enhanced populations of energetic electrons and protons surrounding the Earth in the magnetosphere. For the first time, Taiwanese participate in a magnetospheric exploration mission - JAXA‐led ERG mission. Through years of efforts, Taiwan team has successfully delivered the LEP‐e (Lowenergy particle experiments–electron analyzer) for deployment on the ERG satellite. The ERG satellite has been successfully launched on December 20, 2016 from the Uchinoura Space Center. Besides the ERG satellite, spacecraft missions conducted by several countries have begun to work synergistically to explore the science associated with space weather. In addition, ground‐based network observatories also work closely together for revealing the complex dynamics of the Earth’s magnetosphere, which is strongly associated with the variability of space weather. To integrate the data from all the space‐borne and ground‐based assets can be daunting. The ERG project adopts the SPEDAS (Space Physics Environment Data Analysis System) as the project data analysis software. The development of SPEDAS is a key to efficiently study the space physics data in the golden era of space research.

(原11/28延期為12/5)2019/12/5(四)13:00綜合大樓1樓48111B教室演講 : Dr. Chun-Sung Jao(Institute of Space Science and Engineering, National Central University)

張貼者:2019年11月25日 下午6:48Dabby Lu   [ 已更新 2019年12月2日 下午5:38 ]

講題: Numerical study of plasma-object interaction: Debye-scale Langmuir probe
摘要: The instrument-carrying satellite and sounding rocket missions are designed to take measurements along the trajectory of spacecraft. However, it is well-known that the local plasma will be disturbed in the process of plasma-object interactions, such as spacecraft body and booms, resulting in the influence on the plasma measurements. For the high-resolution plasma density data, the multi-needle Langmuir probe (m-NLP) instrument, which consists of two or more Langmuir probes, is widely used in the in-situ measurement missions. However, we found that the interaction between space plasma and single Debye-scale probe may also affect the measurement of other probes. To clarify this issue, we employ a self-consistent unstructured Particle-In-Cell model for numerical studies. These studies can provide a reference for the data processing and the future design of m-NLP instruments.

2019/11/25(一)13:00綜合大樓1樓48111B教室演講 : 陳乃華 博士(國家高速網路與計算中心)

張貼者:2019年11月21日 下午9:04Dabby Lu   [ 已更新 2019年11月25日 下午6:49 ]

講題: How is AI changing our work in space science?
摘要: Machine learning has merged as a useful method in various applications. Recent years numerous breakthroughs have spiked the use of machine learning and also initiate the experimental researches in the scientific community. In combination of computing facility and massive dataset, machine learning has made a great progress in tasks like image classification. Such technology indeed causes a lot of attentions and concerns.  How can we benefit from such technology in the near future?  In this talk, I will briefly introduce the current usage of machine learning in space science, such as solar flare occurrence, solar spectral irradiance etc.

<專題討論>2019/11/14(四)14:10綜合大樓2樓48218教室演講 : Professor Ling-Hsiao Lyu (Institute of Space Science and Engineering, National Central University)

張貼者:2019年11月11日 上午12:20Dabby Lu

講題: A Study of medium frequency waves in the ion-electron two-fluid plasma and their applications to the whistler-chorus waves observed in the Earth magnetosphere


<專題討論>2019/10/31(四)14:10綜合大樓2樓48218教室演講 : 李宗懋 (成功大學電漿所 / 博士生)

張貼者:2019年10月29日 上午1:05Dabby Lu

講題: introductory talk about research in Professor Kawamori's group.

<專題討論>2019/10/17(四)14:10綜合大樓2樓48218教室演講 : 西村泰太郎 副教授 (成功大學電漿所)

張貼者:2019年10月16日 下午6:52Dabby Lu   [ Ann-Chen Jang 已於 2019年10月16日 下午6:52 更新 ]

講題: Introduction to research by Professor Yasutaro Nishimura. 

<專題討論>2019/10/3(四)14:10綜合大樓2樓48218教室演講 : 陳炳志 副教授 (成功大學電漿所)

張貼者:2019年10月2日 下午6:06Dabby Lu   [ Ann-Chen Jang 已於 2019年10月2日 下午6:06 更新 ]

講題: Introduction to research by Professor Alfred Chen

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