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  • 1
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    Zero-field NMR and NQR studies of magnetically ordered state in charge-ordered EuPtP (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-03-19
    Description: Author(s): T. Koyama, T. Maruyama, K. Ueda, T. Mito, A. Mitsuda, M. Umeda, M. Sugishima, and H. Wada EuPtP undergoes two valence transitions and has two kinds of valence states of Eu ions at low temperatures. In the charge-ordered state, this compound shows an antiferromagnetic order ascribed to magnetic divalent Eu ions. We investigated the antiferromagnetically ordered state of EuPtP by nuclear m... [Phys. Rev. B 91, 094419] Published Wed Mar 18, 2015
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Neutrino-driven explosions of ultra-stripped Type Ic supernovae generating binary neutron stars (2015)
    Oxford University Press
    Details
    Publication Date: 2015-10-19
    Description: We study explosion characteristics of ultra-stripped supernovae (SNe), which are candidates of SNe generating binary neutron stars (NSs). As a first step, we perform stellar evolutionary simulations of bare carbon–oxygen cores of mass from 1.45 to 2.0 M until the iron cores become unstable and start collapsing. We then perform axisymmetric hydrodynamics simulations with spectral neutrino transport using these stellar evolution outcomes as initial conditions. All models exhibit successful explosions driven by neutrino heating. The diagnostic explosion energy, ejecta mass, Ni mass, and NS mass are typically ~10 50  erg, ~0.1 M , ~0.01 M , and 1.3 M , which are compatible with observations of rapidly evolving and luminous transient such as SN 2005ek. We also find that the ultra-stripped SN is a candidate for producing the secondary low-mass NS in the observed compact binary NSs like PSR J0737–3039.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 3
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    Effects of Sr Addition to La-Based Perovskite Sensing-Electrode on YSZ-Based Amperometric-Type NOx Sensor (2011)
    Institute of Physics (IOP)
    Details
    Publication Date: 2011-07-01
    Description: Sensing characteristics of amperometric NOx sensor using yttria-stabilized zirconia (YSZ) and La-based perovskite-type oxide sensing-electrode (SE) was examined. La 0.8 Sr 0.2 MO 3 (M = Co, Mn, Fe) and LaMnO 3 was synthesized by means of spray pyrolysis method. The sensor attached with La 0.8 Sr 0.2 MnO 3 as a SE showed the highest occupancy rate of NO 2 response in total current as well as low current response to CO, C 3 H 6 , NH 3 at 600°C in O 2 (21%). The response was increased with increasing NO 2 concentration in the examined range between 50 to 800 ppm. The comparison of sensing property between LaMnO 3 -SE and La 0.8 Sr 0.2 MnO 3 -SE showed the substitution Sr for La improved the NO 2 response for the sensors.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 4
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    Calcium-dependent phospholipid scrambling by TMEM16F (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-11-26
    Description: In all animal cells, phospholipids are asymmetrically distributed between the outer and inner leaflets of the plasma membrane. This asymmetrical phospholipid distribution is disrupted in various biological systems. For example, when blood platelets are activated, they expose phosphatidylserine (PtdSer) to trigger the clotting system. The PtdSer exposure is believed to be mediated by Ca(2+)-dependent phospholipid scramblases that transport phospholipids bidirectionally, but its molecular mechanism is still unknown. Here we show that TMEM16F (transmembrane protein 16F) is an essential component for the Ca(2+)-dependent exposure of PtdSer on the cell surface. When a mouse B-cell line, Ba/F3, was treated with a Ca(2+) ionophore under low-Ca(2+) conditions, it reversibly exposed PtdSer. Using this property, we established a Ba/F3 subline that strongly exposed PtdSer by repetitive fluorescence-activated cell sorting. A complementary DNA library was constructed from the subline, and a cDNA that caused Ba/F3 to expose PtdSer spontaneously was identified by expression cloning. The cDNA encoded a constitutively active mutant of TMEM16F, a protein with eight transmembrane segments. Wild-type TMEM16F was localized on the plasma membrane and conferred Ca(2+)-dependent scrambling of phospholipids. A patient with Scott syndrome, which results from a defect in phospholipid scrambling activity, was found to carry a mutation at a splice-acceptor site of the gene encoding TMEM16F, causing the premature termination of the protein.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Suzuki, Jun -- Umeda, Masato -- Sims, Peter J -- Nagata, Shigekazu -- England -- Nature. 2010 Dec 9;468(7325):834-8. doi: 10.1038/nature09583. Epub 2010 Nov 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medical Chemistry, Graduate School of Medicine, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21107324" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes/cytology/drug effects ; Calcium/antagonists & inhibitors/*metabolism/pharmacology ; Cell Line ; Cell Membrane/drug effects/*metabolism ; Cloning, Molecular ; DNA, Complementary/genetics ; Flow Cytometry ; Gene Library ; Humans ; Ionophores/pharmacology ; Mice ; Mutant Proteins/chemistry/genetics/metabolism ; Phosphatidylserines/metabolism ; Phospholipid Transfer Proteins/chemistry/genetics/*metabolism ; Phospholipids/*metabolism ; RNA Splice Sites/genetics ; Reverse Transcriptase Polymerase Chain Reaction ; Syndrome
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Changes in temperature preferences and energy homeostasis in dystroglycan mutants (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-03-28
    Description: Temperature affects the physiology, behavior, and evolution of organisms. We conducted mutagenesis and screens for mutants with altered temperature preference in Drosophila melanogaster and identified a cryophilic (cold-seeking) mutant, named atsugari (atu). Reduced expression of the Drosophila ortholog of dystroglycan (DmDG) induced tolerance to cold as well as preference for the low temperature. A sustained increase in mitochondrial oxidative metabolism caused by the reduced expression of DmDG accounted for the cryophilic phenotype of the atu mutant. Although most ectothermic animals do not use metabolically produced heat to regulate body temperature, our results indicate that their thermoregulatory behavior is closely linked to rates of mitochondrial oxidative metabolism and that a mutation in a single gene can induce a sustained change in energy homeostasis and the thermal responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Takeuchi, Ken-Ichi -- Nakano, Yoshiro -- Kato, Utako -- Kaneda, Mizuho -- Aizu, Masako -- Awano, Wakae -- Yonemura, Shigenobu -- Kiyonaka, Shigeki -- Mori, Yasuo -- Yamamoto, Daisuke -- Umeda, Masato -- New York, N.Y. -- Science. 2009 Mar 27;323(5922):1740-3. doi: 10.1126/science.1165712.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19325118" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Animals ; Animals, Genetically Modified ; Body Temperature Regulation ; Calcium/metabolism ; *Cold Temperature ; Drosophila Proteins/genetics/*physiology ; Drosophila melanogaster/genetics/*physiology ; Dystroglycans/genetics/*physiology ; *Energy Metabolism ; Homeostasis ; Mitochondria/metabolism ; Mutant Proteins ; Mutation ; Oxygen Consumption ; Phenotype ; Pyruvate Dehydrogenase Complex/metabolism ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
    Electronic Resource
    Electronic Resource
    Transport critical currents in field-oriented Y1Ba2Cu3Oy polycrystals (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 800-807 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Field-orientedY1Ba2Cu3Oy samples with various values of the transport critical current density, Jc, have been prepared with various heat treatments. The Jc increased rapidly with an increase in relative sintered density of the oriented samples. The field-oriented samples with higher Jc had grains of larger sizes and better connections between the neighboring grains than the low Jc samples. The maximum values of Jc at a magnetic field of 7 T were 370 A/cm2 at 4.2 K and 24 A/cm2 at 77 K. The hysteresis in the Jc-H curves at 4.2 K decreased with an increase in Jc both for an applied field H(parallel)ab plane and for H(parallel)c axis. The critical currents of the samples with higher Jc were less degraded by aging in the air for 1 year than those of the low Jc samples. The relation between the field-cooled Jc-H curves and the zero-field-cooled ones for an oriented sample with low Jc is qualitatively interpreted by the effect of the intragrain currents on the intergrain fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351372
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  • 7
    Electronic Resource
    Electronic Resource
    High critical current densities reproducibly observed for hot-isostatic-pressed PbMo6S8 wires with Mo barriers (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1180-1182 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fabrication process, critical current densities (Jc), and microstructure of the superconducting PbMo6S8 wires with Mo barriers have been investigated. Reducing the volume fraction of the Mo barrier and using electron-beam-melted Mo with less deformation resistance than that of conventional powder-metallurgy-processed Mo, facilitate the densification of PbMo6S8 and Jc improvement by the hot-isostatic-pressing (HIP) treatments. We have succeeded in obtaining reproducibly HIP treated PbMo6S8 wires with homogeneously high Jc≥108 A/m2 at 22 T and 4.2 K, which is promising for the production of future high field ((approximately-greater-than)20 T) superconducting magnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351799
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  • 8
    Electronic Resource
    Electronic Resource
    Critical current density of high-quality Bi2Sr2Ca2Cu3Ox thin films prepared by metalorganic chemical-vapor deposition (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2951-2957 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Critical current densities Jc were measured in as-deposited, c-axis-oriented Bi2Sr2Ca2Cu3Ox thin films with Tc values as high as 97 K, which were prepared by metalorganic chemical-vapor deposition. These films showed high Jc ((approximately-greater-than)109 A/m2) at 77.3 K in high magnetic fields (≥1 T, H(parallel)a-b plane). The best values are 3.3×109 A/m2 at 1 T and 9.1×108 A/m2 at 8 T, which are the highest Jc for Bi-oxide thin films among those reported so far. There were no signs of weak links in the Jc(H) behavior, and the surface morphology examined by scanning electron microscopy showed no apparent grain boundaries. The values of Jc decreased sharply when the applied field deviated from the a-b plane, and went to zero at the angles where the field component in the c direction is nearly equal to the irreversibility field Hc2* parallel to the c axis. The angular dependence of Jc of these films is most reasonably explained by the theory of intrinsic pinning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351499
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  • 9
    Electronic Resource
    Electronic Resource
    Poor intergrain connectivity of PbMo6S8 in sintered Mo-sheathed wires and the beneficial effect of hot-isostatic-pressing treatments on the transport critical current density (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1606-1613 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microstructure of Mo-sheathed Chevrel-phase superconducting wires was investigated by high-resolution scanning electron microscopy (SEM). Excess Pb forms small nodules (10–30 nm) on the Chevrel-phase grains or wetting layers between the Chevrel grains. The critical current density Jc is strongly reduced when wetting layers are present. However, second-phase Mo exists as islands as large as 2–10 μm and has little harmful effect on Jc. Although some Mo-sheathed wires sintered at 700 °C show relatively high Jc ( ≥ 2 × 108 A/m2 at 8 T), the Chevrel phase in these wires has a very porous microstructure, and the Jc values measured with a magnetic field parallel to the current, Jc((parallel)), were only about 10% higher than the Jc values measured with a field perpendicular to the current, Jc(⊥). This clearly suggests that the transport current flows percolatively in these wires. Much denser microstructures were obtained by hot-isostatic-pressing (HIP) treatments at 1200 °C, and very high Jc values, (approximately-greater-than) 5 × 108 A/m2 at 8 T and 9.3 × 107 A/m2 at 23 T, which are of the order of the highest Jc values so far reported, were observed. High-resolution SEM observations of HIP'ed wires demonstrate that the interconnectivity between the Chevrel grains was much improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349525
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  • 10
    Electronic Resource
    Electronic Resource
    Strain effect in the critical current densities of superconducting Nb3Ge tapes (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2131-2140 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dependence of the critical current density in chemical-vapor-deposited Nb3Ge tapes on tensile strain was investigated in magnetic fields up to 14 T perpendicular to the tape plane. The pinning force density Fp was found to be well represented by the strain scaling relation, Fp=c[Hc2(ε)]0.93h0.46(1−h)2.4, where Hc2(ε) is the upper critical field dependent on the applied strain ε and h is the reduced magnetic field H/Hc2(ε). For the Nb3Ge tapes studied, Hc2(ε) was found to be expressed by the form Hc2(ε)=Hc2(εm)[1−1550||ε0||1.92], where εm is the applied strain corresponding to zero intrinsic strain and ε0 is an intrinsic strain expressed by ε−εm. From the strain scaling relation, the values of the maximum upper critical field corresponding to the zero intrinsic strain, Hc2(εm), were calculated as 27.2 T for the Nb3Ge tape with 10.6-μm-thick Nb3Ge layers and a critical temperature Tc (midpoint) of 19.6 K, and 24.8 T for the Nb3Ge tape with 1.3-μm-thick Nb3Ge layers and Tc of 18.3 K. For these same tapes, the critical fields at the zero applied strain, Hc2(0), were 25.7 and 22.8 T, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356275
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