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  • 1
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    The pseudo-primary field due to a point-source in a finely layered medium (1991)
    In:  Geophys. J. Int., Tokyo Univ., Geophys. Inst., Fac. of Science, vol. 104, no. 2, pp. 489-506, pp. B12302, (ISSN 0343-5164)
    Details
    Publication Date: 1991
    Keywords: Seismology ; Seismics (controlled source seismology) ; Layers ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Generalized Radon Transformation inversion for elastic parameters using PP, Ps, SP, and SS seismic data (1990)
    Soc. Exp. Geophys.
    In:  60th Annual Meeting of SEG, San Francisco, Soc. Exp. Geophys., vol. 10, no. GL-TR-89-0259, pp. 1199-1202, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1990
    Keywords: Inversion ; Seismics (controlled source seismology) ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Effect of the external field on the soft magnetic properties and microstructure of directly cast Fe75P8.7B5C7Si4.3 nanocrystalline sheets (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-04-17
    Description: A new method to fabricate soft magnetic bulk metallic glasses (BMGs) by an injection casting with applying external magnetic field during solidification has been developed. The effect of applying magnetic fields (H a ) on soft magnetic properties and microstructure of Fe 75 P 8.7 B 5 C 7 Si 4.3 alloy sheets with dimension of t × 4 mm × 15 mm ( t  = 1–3 mm) have been studied. The microstructure shows that the fully amorphous is attained by the applying magnetic field even at the core region of the thicker sheets with t = 3 mm. All studied sheets exhibit similar saturation magnetization of 1.23–1.25 T, but the coercivity and resistivity are strongly dependent on the thickness t and the strength of magnetic field H a , where H c increases with t , the slope of H c versus t decreases with the increase of H a , and the resistivity increases with the increase of H a . The changes of coercivity and resistivity are strongly related to the fully amorphous induced by H a . The external magnetic field has significant improvement in glass forming ability, and thus coercivity and resistivity for the studied sheet, especially for larger t = 3 mm. This study suggests that applying a magnetic field during the casting process provides a useful way to produce high-performance magnetically soft Fe-based BMGs.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Inverse spin Hall effect in Pt/(Ga,Mn)As (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-06-04
    Description: We investigate dc voltages under ferromagnetic resonance in a Pt/(Ga,Mn)As bilayer structure. A part of the observed dc voltage is shown to originate from the inverse spin Hall effect. The sign of the inverse spin Hall voltage is the same as that in Py/Pt bilayer structure, even though the stacking order of ferromagnetic and nonmagnetic layers is opposite to each other. The spin mixing conductance at the Pt/(Ga,Mn)As interface is determined to be of the order of 10 19  m −2 , which is about ten times greater than that of (Ga,Mn)As/p-GaAs.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Domain wall pinning on strain relaxation defects (stacking faults) in nanoscale FePd (001)/MgO thin films (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-10-10
    Description: FePd (001) films, prepared by an electron beam deposition system on MgO(100), exhibit a perpendicular magnetic anisotropy (1.7 × 10 7  erg/cc) with a high order parameter (0.92). The relation between stacking faults induced by the strain relaxation, which act as strong domain wall pinning sites, and the perpendicular coercivity of (001) oriented L 1 0 FePd films prepared at different temperatures have been investigated. Perpendicular coercivity can be apparently enhanced by raising the stacking fault densities, which can be elevated by climbing dissociation of total dislocation. The increased stacking fault densities (1.22 nm −2 ) with large perpendicular coercivity (6000 Oe) are obtained for samples prepared at 650 °C. This present work shows through controlling stacking fault density in FePd film, the coercivity can be manipulated, which can be applied in future magnetic devices.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 6
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    Territorial behavior in Taiwanese kukrisnakes (Oligodon formosanus) [Ecology] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-05-04
    Description: The independent evolutionary origin of a complex trait, within a lineage otherwise lacking it, provides a powerful opportunity to test hypotheses on selective forces. Territorial defense of an area containing resources (such as food or shelter) is widespread in lizards but not snakes. Our studies on an insular population of Taiwanese kukrisnakes (Oligodon formosanus) show that females of this species actively defend sea turtle nests by repelling conspecifics for long periods (weeks) until the turtle eggs hatch or are consumed. A clutch of turtle eggs comprises a large, long-lasting food resource, unlike the prey types exploited by other types of snakes. Snakes of this species have formidable weaponry (massively enlarged teeth that are used for slitting eggshells), and when threatened, these snakes wave their tails toward the aggressor (an apparent case of head-tail mimicry). Bites to the tail during intraspecific combat bouts thus can have high fitness costs for males (because the hemipenes are housed in the tail). In combination, unusual features of the species (ability to inflict severe damage to male conspecifics) and the local environment (a persistent prey resource, large relative to the snakes consuming it) render resource defense both feasible and advantageous for female kukrisnakes. The (apparently unique) evolution of territorial behavior in this snake species thus provides strong support for the hypothesis that resource defensibility is critical to the evolution of territoriality.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 7
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    Effect of Ba substitution on the multiferroic properties of BiFeO3 films on glass substrates (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-03-31
    Description: Effect of Ba substitution on the multiferroic properties of non-epitaxially grown polycrystalline Bi 1−x Ba x FeO 3 (BBFO) films on refined Pt(111) electrode buffered glass substrates is studied. The structural analysis shows that a pure perovskite phase is present for BBFO films (x = 0.05-0.15), and (110) preferred orientation is developed for films with high x = 0.15. The grain size and surface roughness are reduced with increasing x. All studied BBFO films show desired ferroelectric and ferromagnetic properties. The good ferroelectric properties with the remanent polarization (2P r ) of 36-70  μ C/cm 2 and electrical coercive field (E c ) of 318-570 kV/cm are attained. On the other hand, the substitution of Ba 2+ for Bi 3+ in the A site of the BFO crystal structure can effectively enhance the ferromagnetic properties with magnetization (M s ) of 9.4-13.9 emu/cm 3 and coercivity (H c ) of 1216-1380 Oe. The ferromagnetic and ferroelectric properties and leakage behavior as functions of Ba content x are discussed.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 8
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    Serotonin-mushroom body circuit modulating the formation of anesthesia-resistant memory in Drosophila [Neuroscience] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-08-18
    Description: Pavlovian olfactory learning in Drosophila produces two genetically distinct forms of intermediate-term memories: anesthesia-sensitive memory, which requires the amnesiac gene, and anesthesia-resistant memory (ARM), which requires the radish gene. Here, we report that ARM is specifically enhanced or inhibited in flies with elevated or reduced serotonin (5HT) levels, respectively. The requirement for 5HT was additive with the memory defect of the amnesiac mutation but was occluded by the radish mutation. This result suggests that 5HT and Radish protein act on the same pathway for ARM formation. Three supporting lines of evidence indicate that ARM formation requires 5HT released from only two dorsal paired medial (DPM) neurons onto the mushroom bodies (MBs), the olfactory learning and memory center in Drosophila: (i) DPM neurons were 5HT-antibody immunopositive; (ii) temporal inhibition of 5HT synthesis or release from DPM neurons, but not from other serotonergic neurons, impaired ARM formation; (iii) knocking down the expression of d5HT1A serotonin receptors in α/β MB neurons, which are innervated by DPM neurons, inhibited ARM formation. Thus, in addition to the Amnesiac peptide required for anesthesia-sensitive memory formation, the two DPM neurons also release 5HT acting on MB neurons for ARM formation.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    Hard magnetic property enhancement of Co7Hf-based ribbons by boron doping (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-11-13
    Description: Hard magnetic property enhancement of melt spun Co 88 Hf 12 ribbons by boron doping is demonstrated. B-doping could not only remarkably enhance the magnetic properties from energy product ((BH) max ) of 2.6 MGOe and intrinsic coercivity ( i H c ) of 1.5 kOe for B-free Co 88 Hf 12 ribbons to (BH) max  = 7.7 MGOe and i H c  = 3.1 kOe for Co 85 Hf 12 B 3 ribbons but also improve the Curie temperature (T C ) of 7:1 phase. The (BH) max value achieved in Co 85 Hf 12 B 3 ribbons is the highest in Co-Hf alloy ribbons ever reported, which is about 15% higher than that of Co 11 Hf 2 B ribbons spun at 16 m/s [M. A. McGuire, O. Rios, N. J. Ghimire, and M. Koehler, Appl. Phys. Lett. 101 , 202401 (2012)]. The structural analysis confirms that B enters the orthorhombic Co 7 Hf (7:1) crystal structure as interstitial atoms, forming Co 7 HfB x , in the as-spun state. Yet B may diffuse out from the 7:1 phase after post-annealing, leading to the reduction of Curie temperature and the magnetic properties. The uniformly refined microstructure with B-doping results in high remanence (B r ) and improves the squareness of demagnetization curve. The formation of interstitial-atom-modified Co 7 HfB x phase and the microstructure refinement are the main reasons to give rise to the enhancement of hard magnetic properties in the B-containing Co 7 Hf-based ribbons.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 10
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    Transformation of chicken cells by the gene encoding the catalytic subunit of PI 3-kinase (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-06-20
    Description: The avian sarcoma virus 16 (ASV 16) is a retrovirus that induces hemangiosarcomas in chickens. Analysis of the ASV 16 genome revealed that it encodes an oncogene that is derived from the cellular gene for the catalytic subunit of phosphoinositide 3-kinase (PI 3-kinase). The gene is referred to as v-p3k, and like its cellular counterpart c-p3k, it is a potent transforming gene in cultured chicken embryo fibroblasts (CEFs). The products of the viral and cellular p3k genes have PI 3-kinase activity. CEFs transformed with either gene showed elevated levels of phosphatidylinositol 3,4-bisphosphate and phosphatidylinositol 3,4,5-trisphosphate and activation of Akt kinase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, H W -- Aoki, M -- Fruman, D -- Auger, K R -- Bellacosa, A -- Tsichlis, P N -- Cantley, L C -- Roberts, T M -- Vogt, P K -- CA 42564/CA/NCI NIH HHS/ -- GM 41890/GM/NIGMS NIH HHS/ -- R01 GM041890/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1997 Jun 20;276(5320):1848-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Experimental Medicine, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9188528" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Avian Sarcoma Viruses/*genetics/physiology ; *Cell Transformation, Neoplastic ; *Cell Transformation, Viral ; Cells, Cultured ; Chick Embryo ; Chickens ; Cloning, Molecular ; Enzyme Activation ; Genes, Viral ; Hemangiosarcoma/genetics/virology ; Molecular Sequence Data ; *Oncogenes ; Phosphatidylinositol 3-Kinases ; Phosphatidylinositol Phosphates/metabolism ; Phosphotransferases (Alcohol Group Acceptor)/*genetics/metabolism ; Platelet-Derived Growth Factor/pharmacology ; Protein-Serine-Threonine Kinases/metabolism ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-akt ; Signal Transduction ; Transfection
    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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