Reduction and reorientation of Cr magnetic moments in Fe/Cr multilayers observed by a 119Sn Mo¨ssbauer probe

The magnetism of Cr thin films in Fe/Cr multilayers was studied using 119Sn subatomic layers inserted in the Cr layers as a Mo¨ssbauer probe for Cr layer thickness from 10 to 160 A. The size and direction of the Cr magnetic moments were inferred from the size and direction of the magnetic hyperfine fields at the Sn nuclear sites. The detected magnetic hyperfine fields indicate that the Cr magnetic moments reduce as the Cr layer thickness decreases, while they do not remarkably change as a function of the distance from the Fe/Cr interface. The magnetic hyperfine fields for the samples grown at 200 °C are smaller and more oriented to the film plane than for the samples grown at room temperature. These observations suggest that the magnetic frustration resulting from Fe/Cr interface imperfections is accommodated by the reduction of the Cr magnetic moments for the samples grown at elevated temperatures, whereas it is accommodated by the reorientation of Cr magnetic moments toward the perpendicular direction to the Fe magnetic moments for the samples grown at lower temperatures.application/pdfjournal articl

Prehistoric pig and dog remains from Fais Island Micronesia

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Reduction of Magnetic Moments in Very Thin Cr Layers of Fe Cr Multilayers:Evidence from 119Sn Mossbauer Spectroscopy

Fe Cr multilayers with monatomic Sn layers embedded in the Cr layers were grown epitaxially on MgO(001) substrates, and the magnetic hyperfine field at the 119Sn nuclear sites was examined using Mossbauer spectroscopy. It was found that nonzero hyperfine field is induced at the Sn sites at room temperature and that the value reduces drastically from 10 to 2 T when the Cr layer thickness decreases from 80 to 10 A. The result indicates that the Cr layers are agnetically ordered even when the thickness is very small and that the magnetic moments of Cr become smaller as the Cr layer thickness decreases.application/pdfjournal articl

教職入門「学校見学」における、学生の能動性を 高める取り組み

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Search for B-→J/ψΛp̅ decay

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Dielectric properties of Pb(Co_<1/3>Nb_<2/3>)O_3 under pressure

The dielectric properties such as the real ε^' and imaginary ε^" parts of the complex permittivity and the spontaneous polarization Ps of single crystal and ceramic Pb(Co_ Nb_)O_3 with the diffuse phase transition (DPT) were measured under various pressures up to 6 kbar. The value of ε^' shows a broad maximum ε^'_ at a temperature T_m (mean Curic temperature). As the pressure increases, the values of ε^'_ and T_m decrease, and the shape of ε^' around T_m becomes somewhat sharper. The pressure coefficient of T_m is about -3.5 Kkbar^ for the ceramic and -3.0 Kkbar for the crystal. Temperature and pressure dependence of ε' and Ps is explained in terms of a phenomenological theory using statistical treatments based on a Gaussian distribution of the local Curie temperature. The value of the standard deviation σ describing the intensity of the DPT is 56 K for the ceramic and 47 K for the crystal, and decreases with increasing pressure.departmental bulletin pape

Stepwise Assembly of Fibrinogen Is Assisted by the Endoplasmic Reticulum Lectin-Chaperone System in HepG2 Cells

<div><p>The endoplasmic reticulum (ER) plays essential roles in protein folding and assembly of secretory proteins. ER-resident molecular chaperones and related enzymes assist in protein maturation by co-operated interactions and modifications. However, the folding/assembly of multimeric proteins is not well understood. Here, we show that the maturation of fibrinogen, a hexameric secretory protein (two trimers from α, β and γ subunits), occurs in a stepwise manner. The αγ complex, a precursor for the trimer, is retained in the ER by lectin-like chaperones, and the β subunit is incorporated into the αγ complex immediately after translation. ERp57, a protein disulfide isomerase homologue, is involved in the hexamer formation from two trimers. Our results indicate that the fibrinogen hexamer is formed sequentially, rather than simultaneously, using kinetic pause by lectin chaperones. This study provides a novel insight into the assembly of most abundant multi-subunit secretory proteins.</p></div

「夢古道の湯」のリラックス効果

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腐食鋼板の力学特性評価のための板厚計測および有効板厚に関する考察

The necessity of assessing the durability of structures such as bridges, offshore structures, has arisen recently. It is obvious that the maintenance of infrastructures has become a key issue to assure the desired performance in operational condition and to prolong the life of structures. As for the life cycle performance of the steel structure in the marine atmosphere, in particular, the damage due to corrosion is important rather than that by fatigue. Investigated herein is the guideline for the thickness measurement of steel elements that are subjected to the corrosion exposure at the specific inspection. Firstly, the measurement of the surface profile of strips cut from corroded steel pipes is made. Secondly, the tensile test is carried out in order to assess the effective thickness in the critical section for the mechanical property evaluation. It is shown that the precise surface profile measurement such as the interval of about 0.3 mm is necessary to evaluate the strength in tension.journal articl