Nagoya Institute of Technology

About: Nagoya Institute of Technology is a education organization based out in Nagoya, Japan. It is known for research contribution in the topics: Thin film & Turbulence. The organization has 10766 authors who have published 19140 publications receiving 255696 citations. The organization is also known as: Nagoya Kōgyō Daigaku & Nitech.

Autocompensation of torque ripple of direct drive motor by torque observer

Abstract: Since a direct drive motor (DDM) does not require a reduction gear, the drive system can be made simple, and therefore it is used in high-precision robot and machine tool applications. However, without reduction gear, a disturbance torque is directly reflected to the motor shaft, and a torque ripple generated by the motor is directly transmitted to the load, causing poor speed control characteristics. An improved torque control system for DDM with a permanent magnet rotor, equipped with a torque observer implemented by digital signal software, is proposed. The speed fluctuation can be fully removed with a torque feedforward loop. >

Influence of co-cations on the formation of Cu+ species in Cu/ZSM-5 and its effect on selective catalytic reduction of NOx with NH3

Abstract: The influence of H+ and Na+ co-cations on the formation of Cu species and on NO reduction activity of Cu/ZSM-5 catalyst is investigated. 3.5Cu/0.6NaZSM-5 catalyst was significantly more active for NOx reduction with NH3 compared with 2.6Cu/HZSM-5. Catalyst characterization indicated that, the type of co-cations present in the catalyst tailors copper species redox properties, NO2 formation rate and acidity of the catalyst. Copper species in NaZSM-5, is relatively easily reducible than when present in HZSM-5. UV–vis and FTIR characterization showed the presence of a higher amount of Cu+ species in 3.5Cu/0.6NaZSM-5 compared to 2.6Cu/HZSM-5. The easily reducible copper along with Cu+ species in 3.5Cu/0.6NaZSM-5 seems to activate oxygen which reacts with NO to form NO2. The Na+ co-cations can further capture the thus produced NO2 to form intermediate surface nitrite/nitrate species, which improves the NOx conversion. The acidity measured by NH3-TPD and FTIR is needed for SCR, but not crucial for NOx conversion.

Block Copolymer Mediated Synthesis of Gold Quantum Dots and Novel Gold−Polypyrrole Nanocomposites

Abstract: Polystyrene-block-poly(2-vinylpyridine) with different block lengths, viz., 190−190 and 800−860 monomer units, have been employed in order to obtain monodisperse Au nanoparticles, dispersed in a polypyrrole (PPY) matrix. In consonance with optical absorption spectra, the formation of a nanodispersion of Au has been corroborated by Mie−Drude theory. The annealing process yields a single Au nanocluster (core) in each micelle, covered by a PPY shell, forming unique core−shell particles. By variation of the block length of the polymer, different sizes of Au nanoclusters, ranging from 7 to 13 nm, covered by a PPY shell within the spherical microdomains of the block copolymer, have been prepared. Different shapes of Au particles, viz., spherical, cubic, tetrahedral, and octahedral, have been observed, with a little nudge in the preparative strategies. Furthermore, we have also observed elegant dendritic nanostructures of Au−PPY in another different approach, by employing vapor phase polymerization of pyrrole on...