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Inorganic Microballon Production from Shinju - Gan Using an Entrained Bed Reactor
Yoshimitsu Uemura,Sumio Nezu,Hidetaka Honda,Yoshihiro Ohzuno,Ijichi , Kazuya,Hatate, Yasuo 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.6
Hollow inorganic microparticles were produced continuously from a volcanic glass (shinju-gan or perlite) using an entrained bed reactor. The microparticles are called expanded perlite. The raw material was a sieved fraction (104㎛ in volume average diameter) of crushed perlite, which is from China. The effects of temperature and residence time on expanded perlite yield were investigated.
Yoshimitsu Kobayashi,Yoko Terai,Minoru Sasaki 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper describes the three-dimensional motion control of a magnetic levitated object in an active electromagnetic levitation conveyance system. Generally, the magnetic levitation conveyance system is useful when we convey products without qualitative degradation due to contact. However it is necessary to control the three-dimensional motion of the levitated object and it is difficult to measure the position. Therefore we propose how to estimate three-dimensional position without a position sensor. Four Hall elements are installed on the bottom of the electromagnet instead of the position sensor. A state observer estimates the three-dimensional position of the levitated object from the four Hall voltages and the current and the input voltage to the electromagnet. The three-dimensional motion controller uses a state-feedback control based on the estimated position. This controller has a large stability margin in order to compensate the modelization error. The validity of the proposed method is confirmed by experiment results.
Yuya Yoshimitsu,Kiwamu Tanaka,Takashi Tagawa,Yasushi Nakamura,Tomoaki Matsuo,Shigehisa Okamoto 한국식물학회 2009 Journal of Plant Biology Vol.52 No.6
Tungsten particles have long been used as microcarriers in biolistic bombardment because of their cost-effectiveness compared to alternative gold particles— even if the former have several drawbacks, including their DNA-degrading activity. We characterized tungsteninduced DNA degradation to assess the value of this metal particle and to improve tungsten-based biolistic bombardment. Alkaline pH, low temperature, and high salt concentration were found to diminish tungsten-induced DNA breakdown. The pH was the most influential factor in this phenomenon, both in aqueous solutions and on the particles. Furthermore, alkaline pH greater than 9.4 of an adsorption mixture was found to be essential for DNA binding to metal particles. Based on these findings, we propose a new formula of DNA/tungsten adsorption by using TE buffers that keep alkaline pH (>9.4) of the mixture, in which tungsten-bound plasmid DNA cleavage was suppressed to half the level of that in the conventional DNA-binding condition.