Partitioning of Si in Fe-Zr-Si-B Nanocrystalline Alloys

A. Ślawska-Waniewska,J. M. Greneche,A. Inoue 한국자기학회 1999 Journal of Magnetics Vol.4 No.1

The microstructure and magnetic properties of Fe_(87)Zr_7Si₄B₂ nanocrystalline alloys were studied by magnetization measurements and Mossbauer spectrometry over a wide temperature range. Three well resolved spectral components have been found and attributed to bcc-Fe grains (with almost pure iron structure), residual amorphous matrix enriched with solute elements and interfaces formed at the grain-matrix boundaries. It has been shown that, contrary to the expectation, during crystallization the atomic segregation occurs leading to the formation of primary bee-Fe grains and the partition of Si atoms into the residual amorphous matrix.

Fabrication of Three-Dimensional Magnetophotonic Crystals: Opal Thin Films Filled with Bi:YIG

R. Fujikawa,A. V. Baryshev,H. Uchida,P. B. Lim,M. Inoue 한국자기학회 2006 Journal of Magnetics Vol.11 No.3

We have fabricated three-dimensional magnetophotonic crystals based on a-SiO₂ opal films. Opal thin films grown on glass substrates were filled with bismuth substituted iron garnet (Bi:YIG). Scanning electron microscopy data, optical and magnetic properties of the synthesized samples confirm the presence of the Bi:YIG content in the opal lattice. It is shown that the samples exhibit the (111) stop band, and transmissivity of the threedimensional magnetophotonic crystals is defined by both the film lattice and the Bi:YIG content.

Frontiers in Magneto-optics of Magnetophotonic Crystals

M. Inoue,A. A. Fedyanin,A. V. Baryshev,A. B. Khanikaev,H. Uchida,A. B. Granovsky 한국자기학회 2006 Journal of Magnetics Vol.11 No.4

The recently published and new results on design and fabrication of magnetophotonic crystals of different dimensionality are surveyed. Coupling of polarized light to 3D photonic crystals based on synthetic opals was studied in the case of low dielectric contrast. Transmissivity of opals was demonstrated to strongly depend on the propagation direction of light and its polarization. It was shown that in a vicinity of the frequency of a single Bragg resonance in a 3D photonic crystal the incident linearly polarized light excites inside the crystal the TE- and TM-eigen modes which passing through the crystal is influenced by Bragg diffraction of electromagnetic field from different (hkl) sets of crystallographic planes. We also measured the Faraday effect of opals immersed in a magneto-optically active liquid. It was shown that the behavior of the Faraday rotation spectrum of the system of the opal sample and magneto-optically active liquid directly interrelates with transmittance anisotropy of the opal sample. The photonic band structure, transmittance and Faraday rotation of the light in three-dimensional magnetophotonic crystals of simple cubic and face centered cubic lattices formed from magneto-optically active spheres where studied by the layer Korringa-Kohn-Rostoker method. We found that a photonic band structure is most significantly altered by the magneto-optical activity of spheres for the high-symmetry directions where the degeneracies between TE and TM polarized modes for the corresponding non-magnetic photonic crystals exist. The significant enhancement of the Faraday rotation appears for these directions in the proximity of the band edges, because of the slowing down of the light. New approaches for one-dimensional magnetophotonic crystals fabrication optimized for the magneto-optical Faraday effect enhancement are proposed and realized. One-dimensional magnetophotonic crystals utilizing the second and the third photonic band gaps optimized for the Faraday effect enhancement have been successfully fabricated. Additionally, magnetophotonic crystals consist of a stack of ferrimagnetic Bi-substituted yttrium-iron garnet layers alternated with dielectric silicon oxide layers of the same optical thickness. High refractive index difference provides the strong spatial localization of the electromagnetic field with the wavelength corresponding to the long-wavelength edge of the photonic band gap.

Fomation and Properties of Multiple-Tone Spatial Light Modulator using Garnet Film with In-Plane Magnetization

A. Tsuzuki,H. Uchida,H. Takagi,P. B. Lim,M. Inoue 한국자기학회 2006 Journal of Magnetics Vol.11 No.3

We attempted to fabricate a new type of magneto optic spatial light modulator (MO-SLM) for multiple-tone modulation by using in-plane magnetization. In the MO-SLM, magnetic property of magneto-optical layer was modified to be suitable for multiple-tone expression by substituting Al in Bi:YIG film. At a driving current to 28 mA in an electrode of the fabricated MO-SLM, changes in brightness of pixels were observed using a polarization microscope.

Nonlinear magneto - optical effects in all - garnet magneto - photonic crystals

A.A. Fedyanin,D. Kobayashi,K. Nishimura,H. Uchida,O.A. Aktsipetrov,M. Inoue 한국자기학회 2003 한국자기학회 학술연구발표회 논문개요집 Vol.13 No.2

Nano-magnetophotonics: Control of Light by Introducing Artificial Nanostructures and Their Applications

M. Inoue,R. Fujikawa,H. Uchida,K. H. Shin,A. Baryshev,A. Khanikaev,A. Fedyanin,A. Granovsky 한국자기학회 2007 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-

Effects of Acute Changes in the Energy and Protein Intake Levels over the Short-term on the Maternal Milk Amino Acid Concentrations in Lactating Mares

Matsui, A.,Inoue, Y.,Asai, Y. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.6

This study was designed to test the effects of changes in energy and protein intake levels on the maternal milk amino acid concentrations over the short-term in lactating mares. Three lactating mares were enrolled for the study 7 weeks after parturition. A low-energy and low-protein diet (LEP) was administered during the first week of the study, followed by administration of a high-energy and high-protein diet (HEP), again for a week (day 1 to day 7), and milk was sampled thrice daily at intervals of 8 h during the study period. The mean amino acid concentrations in the maternal milk, except for those of proline, serine and valine, were significantly higher in the HEP feeding period than during the LEP feeding period (p<0.05). The sum of the concentrations of all the amino acids (TAA) in the maternal milk samples during the HEP and LEP feeding periods was 1,644.9${\pm}$26.9 and 1,542.3${\pm}$36.0 mg/100 g, respectively, the difference between the two was not significant. When the ratio of each amino acid concentration to the TAA in the maternal milk was analyzed, there were significant differences between the HEP and LEP feeding periods for all amino acids, except glycine, serine, alanine and histidine. It was found that the concentrations of glutamic acid+glutamine, serine, threonine, arginine and valine were significantly higher (p<0.05) on day 1 than on day 7 during the LEP feeding period, and there were no such differences during the HEP feeding period. In regard to the effects of changes in the energy and protein intake levels in lactating mares, no changes in milk amino acid concentrations were found following administration of HEP for a week, whereas 7 days of administration of LEP was associated with a decrease in the amino acid concentrations.

Interface structure and properties of a brass-reinforced Ni₅₉Zr₂₀Ti₁₆Si₂Sn₃ bulk metallic glass composite

Wang, K.,Fujita, T.,Pan, D.,Nieh, T.G.,Inoue, A.,Kim, D.H.,Chen, M.W. Elsevier 2008 Acta materialia Vol.56 No.13

<P><B>Abstract</B></P><P>Interfaces between a Ni<SUB>59</SUB>Zr<SUB>20</SUB>Ti<SUB>16</SUB>Si<SUB>2</SUB>Sn<SUB>3</SUB> bulk metallic glass (BMG) and crystalline brass reinforcements were characterized using transmission electron microscopy and nanoindentation. An interfacial layer with a thickness of ∼50–100nm was observed in the composite prepared by warm extrusion of gas atomized powders. Microstructural characterization and chemical analysis suggest that the formation of interfacial layer was caused by interdiffusion between the BMG and brass during the warm extrusion. Nanoindentation in the vicinity of BMG–brass interfaces does not cause interface decohesion or crack formation, suggesting a strong interface bonding. Apparently, the resultant interfacial layer not only enhances interfacial bonding but also provides a buffer zone to prevent the catastrophic shear band propagation in the BMG matrix.</P>

Hydrogen-rich gas production from waste plastics by pyrolysis and low-temperature steam reforming over a ruthenium catalyst

Namioka, T.,Saito, A.,Inoue, Y.,Park, Y.,Min, T.j.,Roh, S.a.,Yoshikawa, K. Applied Science Publishers 2011 APPLIED ENERGY Vol.88 No.6

Operating conditions for low-temperature pyrolysis and steam reforming of plastics over a ruthenium catalyst were investigated. In the range studied, the highest gas and lowest coke fractions for polystyrene (PS) with a 60gh<SUP>-1</SUP> scale, continuous-feed, two-stage gasifier were obtained with a pyrolyzer temperature of 673K, steam reforming temperature of 903K, and weight hourly space velocity (WHSV) of 0.10g-sample g-catalyst<SUP>-1</SUP>h<SUP>-1</SUP>. These operating conditions are consistent with optimum conditions reported previously for polypropylene. Our results indicate that at around 903K, the activity of the ruthenium catalyst was high enough to minimize the difference between the rates of the steam reforming reactions of the pyrolysates from polystyrene and polypropylene. The proposed system thus has the flexibility to compensate for differences in chemical structures of municipal waste plastics. In addition, the steam reforming temperature was about 200K lower than the temperature used in a conventional Ni-catalyzed process for the production of hydrogen. Low-temperature steam reforming allows for lower thermal input to the steam reformer, which results in an increase in thermal efficiency in the proposed process employing a Ru catalyst. Because low-temperature steam reforming can be also expected to reduce thermal degradation rates of the catalyst, the pyrolysis-steam reforming process with a Ru catalyst has the potential for use in small-scale production of hydrogen-rich gas from waste plastics that can be used for power generation.

Image-Based Markers Predict Dynamic Instability in Lumbar Degenerative Spondylolisthesis

William Slikker III,Alejandro A. Espinoza Orías,Grant D. Shifflett,Joe Y.B. Lee,Krzysztof Siemionow,Sapan Gandhi,Louis Fogg,Dino Samartzis,Nozomu Inoue,Howard S. An 대한척추신경외과학회 2020 Neurospine Vol.17 No.1

Objective: To identify possible radiographic predictors markers of dynamic instability including disc height (DH), disc degeneration, and spondylosis in the setting of degenerative spondylolisthesis (DS). Methods: A retrospective review with prospectively collected data was performed on 125 patients with L4–5 DS who underwent decompression and fusion. Patients were divided into groups with dynamic instability and those without. Radiographs of the lumbar spine in neutral, flexion, and extension were used to determine degree of slip, DH, translational motion, angular motion, spondylotic changes, and lumbar lordosis. Magnetic resonance imaging (MRI) scans were reviewed to assess disc degeneration. Results: Thirty-one percent of the patients met criteria for dynamic instability. Significant correlations (p<0.05) were found between preserved DH and dynamic instability; increased spondylotic changes and decreased translational motion; as well as advanced MRI-based disc degeneration scores with decreased angular motion, respectively. Six radiographic parameters were utilized to create a predictive model for dynamic instability, and a receiver operating characteristic curve was able to validate the predictive model (area=0.891, standard error=0.034, p<0.001). Conclusion: In DS patients, preserved DH was significantly related to dynamic instability. This finding may represent a greater potential for slip progression over time in these patients. In contrast, disc degeneration on MRI, and spondylotic changes were inversely related to dynamic instability and may represent restabilization mechanisms that decrease the chance of future slip progression in DS.