Time filter

Source Type

Matinde E.,Tohoku University | Hino M.,Tohoku University | Hino M.,Hokkaido Polytechnic College
ISIJ International | Year: 2011

This paper proposes a novel process for the pre-treatment of high phosphorus iron ore by pre-reduction, air jet milling and screening methods. The dephosphorization behavior was evaluated as a function of such parameters as the milling gas kinetic energy, E k and specific energy consumption, E sp. At a fixed milling gas kinetic energy, the dephosphorization treatment behavior was highly dependent on the solids feed rate and the degree of sintering of the pre-reduced phases. The proposed pre-treatment process involves a pre-reduction process by carbonaceous materials at 1200°C, and air jet milling using E k of 325.24 kJ and E sp of 3.24 kJkg -1h followed by fine screen separation using a 25 μm screen size. © 2011 ISIJ.

Seok S.-H.,RIST | Seok S.-H.,Tohoku University | Miki T.,Tohoku University | Hino M.,Tohoku University | Hino M.,Hokkaido Polytechnic College
ISIJ International | Year: 2011

The Ti deoxidation equilibrium of Fe-Ni, Fe-Cr and Fe-Cr-Ni alloys saturated with 'Ti3O5' and Ti2O3 phase was clarified in previous researches. Solubility of Fe, Cr and/or Ni oxides in 'Ti3O5' phase equilibrated with liquid Fe-Ni, Fe-Cr and Fe-Cr-Ni alloys at 1823 K to 1923 K were measured by SEM-EDS. It was confirmed that the solubility of Fe, Cr and/or Ni oxide in 'Ti3O 5' phase at low Ti content increase with decrease of Ti content in alloys. Titanium content that dissolution of Fe, Cr and/or Ni oxide into 'Ti3O5' phase becomes apparent increases with increase of Cr and/or Ni content of the alloys. The activity of Ti deoxidation product, 'Ti3O5' phase, equilibrated with Fe-Ni, Fe-Cr and Fe-Cr-Ni alloys was also evaluated by Redlich-Kister type polynomial. Equilibrium between Ti and O at low Ti content of those alloys was analyzed using the activity of 'Ti3O5' phase. © 2011 ISIJ.

Kumadaki M.,Muroran Institute of Technology | Yoshino M.,Hokkaido Polytechnic College | Sato K.,Muroran Institute of Technology | Itoh H.,Muroran Institute of Technology
IEEJ Transactions on Fundamentals and Materials | Year: 2014

We deposited SiCN thin films by RF plasma CVD (Chemical Vapor Deposition) method using a mixture of Tetramethylsilane (TMS), nitrogen, and hydrogen gas. Deposited films were measured some properties with Fourier-Transform Infrared Spectroscopy (FT-IR), X-ray Photoelectron Spectroscopy (XPS), Ellipsometry and Atomic Force Microscope (AFM). We found that the temperature of substrate increased elimination and absorption reaction on the surface, and a fine film could be deposited at the temperature of 973K. To deposit SiCN with lower temperature, we changed H2 flow rate. As results, we found that H2 flow rate had great influence on the efficiency of decomposition of TMS. Moreover, the roughness of substrate was affected by the mixture rate of TMS. We could obtain the films nearly similar to the 973K ones at the state of 100Pa of pressure, 773K of substrate temperature, 80sccm of H2 flow rate, and TMS mixture rate of 3% to 5%. In particular, 5% of TMS mixture rate could be considered as the best condition on this experiment. © 2014 The Institute of Electrical Engineers of Japan.

Aogaki R.,Tokyo Polytechnic University | Aogaki R.,Japan National Institute of Materials Science | Morimoto R.,Saitama Prefectural Showa Water Filtration Plant | Asanuma M.,Yokohama Harbour Polytechnic College | And 4 more authors.
Magnetohydrodynamics | Year: 2015

Chiral catalytic activities of electrode surfaces fabricated by magnetoelectrochemical etching without oxygen adsorption in a vertical magnetohydrodynamic (MHD) flow have been theoretically examined. Then, the following points were clarified: under anionic specific adsorption, such activities arise from the screw dislocations of 2D pits. Their chirality is donated by microscopic vortexes termed micro-MHD flows, which are formed on the free surfaces covered with ionic vacancies. As a result, under upward (+) and downward (-) magnetic fields, D (dextrorotatory)- and L (levorotatory)-activities appear, respectively.

Takase Y.,Chiba Institute of Technology | Wada T.,Hokkaido Polytechnic College | Ikeda T.,Chiba Institute of Technology | Shinohara Y.,Tokyo Institute of Technology
Proceedings of the 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS 2013 | Year: 2013

Recently, it has become increasingly important to instigate more widespread seismic retroftting for seismically weak structures in Japan, which is frequently subject to massive earthquakes. Generally, post-installed anchors are used to connect the seismic retroftting members to existing members. However, no computational models of post-installed anchors have yet been proposed in previous studies to evaluate stress-displacement relationships. Accordingly, we developed a new mechanical model for post-installed anchors. In this model, the kinking behavior of anchor bolts, bearing behavior of concrete, and tensile behavior of anchor bolts are considered. The proposed model can reasonably simulate the mechanical behaviors of the previous test results.

Discover hidden collaborations