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Variable speed control of weight stacks in 3 kN force standard machine
Toshiyuki Hayashi,Yoshihisa Katase,Hiroshi Maejima,Yukio Yamaguchi,Kazunaga Ueda 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In calibrations of force measuring instruments using dead-weight type force standard machines, increasing the moving speed of dead-weights in linkage-weight stacks generally improves working efficiency but makes the calibration uncertainty worse due to oscillation of the weights. This conflict can be solved by introducing variable speed control of the linkage-weight stacks to drive the weights quickly in most loading/unloading processes and reduce the speed only when the moving weight comes close to a neighboring weight. Thus, variable speed control reduces the calibration time and prevents weight oscillation. The 3 kN dead-weight type force standard machine of NMIJ has already been equipped with AC servo motors for weight actuation, and variable speed control can be realized by modifying the existing control software. This report describes the design and results of the modification.
Directing Oxygen Vacancy Channels in SrFeO<sub>2.5</sub> Epitaxial Thin Films
Khare, Amit,Lee, Jaekwang,Park, Jaeseoung,Kim, Gi-Yeop,Choi, Si-Young,Katase, Takayoshi,Roh, Seulki,Yoo, Tae Sup,Hwang, Jungseek,Ohta, Hiromichi,Son, Junwoo,Choi, Woo Seok American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.5
<P>Transition-metal oxides (TMOs) with brown-millerite (BM) structures possess one-dimensional oxygen. vacancy channels (OVCs), which play a key role in realizing high ionic conduction at low temperatures. The controllability of the vacancy channel orientation, thus, possesses a great potential for practical applications and would provide a better visualization of the diffusion pathways of ions in TMOs. In this study, the orientations of the OVCs in BM-SrFeO2.5 are stabilized along two crystallographic directions of the epitaxial thin films. The distinctively orientated phases are found to be highly stable and exhibit a. considerable difference in their electronic structures and optical properties, which could be understood in terms of orbital anisotropy. The control of the OVC orientation further leads to modifications in the hydrogenation of the BM-SrFeO2.5 thin films. The results demonstrate a strong correlation between crystallographic orientations, electronic structures, and ionic motion in the BM structure.</P>
Rezaul H. Ansary,Mokhlesur M. Rahman,Mohamed B. Awang,Haliza Katas,Hazrina Hadi,Farahidah Mohamed,Abd Almonem Doolaanea,Yunus B. Kamaruzzaman 대한약학회 2016 Archives of Pharmacal Research Vol.39 No.9
The aim of this study was to prepare a model protein, bovine serum albumin (BSA) loaded double-walled microspheres using a fast degrading glucose core, hydroxyl-terminated poly(lactide-co-glycolide) (Glu- PLGA) and a moderate-degrading carboxyl-terminated PLGA polymers to reduce the initial burst release and to eliminate the lag phase from the release profile of PLGA microspheres. The double-walled microspheres were prepared using a modified water-in-oil-in-oil-in-water (w/o/o/ w) method and single-polymer microspheres were prepared using a conventional water-in-oil-in-water (w/o/w) emulsion solvent evaporation method. The particle size, morphology, encapsulation efficiency, thermal properties, in vitro drug release and structural integrity of BSA were evaluated in this study. Double-walled microspheres prepared with Glu-PLGA and PLGA polymers with a mass ratio of 1:1 were non-porous, smooth-surfaced, and spherical in shape. A significant reduction of initial burst release was achieved for the double-walled microspheres compared to single-polymer microspheres. In addition, microspheres prepared using Glu-PLGA and PLGA polymers in a mass ratio of 1:1 exhibited continuous BSA release after the small initial burst without any lag phase. It can be concluded that the double-walled microspheres made of Glu-PLGA and PLGA polymers in a mass ratio of 1:1 can be a potential delivery system for pharmaceutical proteins.