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Development of Dual Stage Micro Plasma Thruster
Ho Thi Thanh Trang(호티탄트랑),Jichul Shin(신지철) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
이단 마이크로 플라즈마 추력기 (μPT)의 개념 설계를 위하여 실험적 연구가 수행되었다. 운전 조건 및 노즐의 설계조건에 따른 전극 간격 및 출구 면적의 변화에 대한 추력기의 성능 최적화 연구가 수행되었다. 운전 압력은 10<SUP>-1</SUP> Torr에서 10<SUP>-4</SUP> Torr의 진공 조건이며 아르곤 가스의 유량은 5 sccm에서 300 sccm에 대하여 추력기의 성능 검증 연구가 이루어 졌다. 소모전력 약 1 watt에서 5 watt의 운전 상태에서 약 3000에서 4000정도의 비추력이 예상된다. 마이크로 플라즈마 추력기에 의해 발생된 토출 제트의 사진 및 전기적 특성에 대한 결과를 포함하였다. This work is devoted to an experimental investigation on conceptual design of dual consecutive stage micro plasma thruster (μPT). Optimization study on the thruster configuration has been performed for various electrode gap distances from 1 mm to 2 mm and the hole diameter from 0.3 mm to 2 mm depending on desired operating conditions and corresponding nozzle design requirement. The operation of μPT at low pressure from 10<SUP>-1</SUP> Torr to 10<SUP>-4</SUP> Torr and at various argon flow rates ranging from 5 sccm to 300 sccm has been studied to understand the physic of plasma and the gas dynamics in details. The specific impulse can reach up to 3000-4000 seconds at low power consumptions from 1 to 5 W. Image of exhaust plume from μPT will be provided and electrical characteristics is also mentioned in this paper.
Ho, Nguyen Thi Thanh,Kutzner, Arne,Heese, Klaus De Gruyter 2018 Biological Chemistry Vol.399 No.1
<P><B>Abstract</B></P><P>Due to an aging society with an increased dementia-induced threat to higher cognitive functions, it has become imperative to understand the molecular and cellular events controlling the memory and learning processes in the brain. Here, we suggest that the novel master gene pair |-SRGAP2-FAM72-| (SLIT-ROBO Rho GTPase activating the protein 2, family with sequence similarity to 72) reveals a new dogma for the regulation of neural stem cell (NSC) gene expression and is a distinctive player in the control of human brain plasticity. Insight into the specific regulation of the brain-specific neural master gene |-SRGAP2-FAM72-| may essentially contribute to novel therapeutic approaches to restore or improve higher cognitive functions.</P>