Saturday, September 22, 2018

180929 空氣汙染的健康風險推估

Title:
空氣汙染的健康風險推估

Time:
09/29 (Sat.) 7 pm PDT, 8 pm MDT, 9 pm CDT, 10 pm EDT
09/30 (Sun.) 10 am Taiwan

Keywords:
Air quality, Modeling development, Photo-chemical modeling, Air pollutant emissions, Toxic air pollutants


Abstract:
二十一世紀初,科學家開始將空氣污染對於人體健康危害量化,2010年之後進一步將空氣污染與人類壽命連結。以美國為例,從發電廠大量顆粒物排放對人類壽命影響最大,而檢視臭氧生成,則是交通汙染源及境外傳輸影響最大。如果考慮美國人均壽命受到微細顆粒物及臭氧影響的時間趨勢,因為不同空氣汙染法規的介入,及美國能源結構的改變,排放源對於美國人壽命減少的貢獻也在改變中。台灣目前使用大氣網格模式配合風險模式研究較少,目前主要研究為台中燃煤火力發電廠,與興建中深澳火力發電廠的風險推估。今天的討論會包括兩個電廠的空氣污染模式及風險推估結果。

Monday, September 17, 2018

180922 Recent Progress in Quantum Computation

Title:
Recent Progress in Quantum Computation


Time:
09/22 (Sat.) 6:30 pm PDT, 7:30 pm MDT, 8:30 pm CDT, 9:30 pm EDT
09/23 (Sun.) 9:30 am Taiwan

Keywords:
Quantum Physics, Quantum computation



Abstract:
I will introduce recent theoretic progress in quantum information theory and quantum computation. In particular, I will focus on some interesting development of quantum machine learning algorithms.

Saturday, September 1, 2018

180908 Novel Applications of Hyperbolic Metamaterials

Title:
Novel Applications of Hyperbolic Metamaterials


Time:
09/08 (Sat.) 6:30 pm PDT, 7:30 pm MDT, 8:30 pm CDT, 9:30 pm EDT
09/09 (Sun.) 9:30 am Taiwan

Keywords:
metamaterials, laser science, 2D material, hyperbolic metamaterials, random laser, graphene, transition metal dichalcogenides, upconversion nanoparticle, metal–organic framework nanoparticle, piezo-phototronic effect


Abstract:
Recently, a research highlight is hyperbolic metamaterials (HMMs), defined by the iso-frequency curve in momentum-space owing to its unique hyperbolic shape. To achieve this artificial structure with promising functionality that provides the increased photonic density of states (PDOS) from the unbounded wave-vector. HMMs can enhance the transition rate of the optical gain media to achieve the lasing action and reduce the threshold, which is very useful to be a suitable candidate for all-optical communication. Furthermore, we also report the demonstration of white random laser action using upconversion nanoparticles (UCNP) deposited on top of HMMs. These combination is capable of producing white random laser from a single segment. The porous structure of the UCNP clusters functions as the microcavity for photon scattering that provides the optical feedback gain for the emitted light. With a suitable design of HMMs superlattice, it is possible to tune the high PDOS that enables to induce emission enhancement at the region of interest to produce a broadband lasing action device that covers the red, green, and blue.