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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of trapped flux distribution in a high-Tc superconductor using a flux-gate magnetometer : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5635-5637 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The distribution of the trapped flux was measured using a miniaturized flux-gate magnetometer with resolution as high as 0.46 mG at 77 K for a BiSrCaCuO high-Tc superconductor cooled down to 77 K in the presence of ac magnetic field (0.5–50 Hz) of 0.6 G in peak-to-peak and in-plane thermal gradient. The amplitude of the trapped flux decreased with increasing the frequency of ac magnetic field. The amplitude was as small as 2 mG for a 50 Hz ac field, and 43 mG for a 0.5 Hz ac field. The amplitude also became small when the cooling rate was made slow. A symbiotic combination of the high-Tc superconducting magnetic shield and the ferromagnetic one with magnetic shaking is proposed, in which merits of both can be enhanced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353621
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  • 2
    Electronic Resource
    Electronic Resource
    A new two-dimensional coil system compensating X,Y,Z components of leakage field from an aperture of magnetic shields (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6876-6876 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lightweight magnetic shields of high performance are required for the precise magnetic field measurements such as brain field measurement by SQUID magnetometers. Most of the present magnetic shielding rooms rely on ferromagnetic enclosures to isolate the area to be shielded from outside and, as a result, become heavy and expensive. In this paper, we propose a new method to compensate the leakage of noise field from an aperture of magnetic shields. The proposed method exploits the flux pattern just inside the aperture of the shielding body. Figure 1 depicts this method. Three flat coils mutually orthogonal and to be placed parallel inside the aperture are driven by the feedback signal to cancel each of three components detected by a three-axis fluxgate magnetometer. The important point of this method is that the coil system is flat unlike other active shielding system employing Helmholtz coils. Numerical results obtained for a superconductor vessel showed that the transverse field was attenuated by a factor of 100. Applying this method, the cylindrical shielding case of superconductor or of ferromagnet can be shortened with high shielding factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352471
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  • 3
    Electronic Resource
    Electronic Resource
    A new method for reducing hysteresis of torque sensors: Cross magnetic shaking : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4919-4921 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cross magnetic shaking, a new method for reducing hysteresis, is proposed for shaft torque sensors based on the magnetostrictive effect of the steel shaft. In this method, an auxiliary magnetic field (shaking field) is superposed perpendicularly to the exciting field while differences in permeabilities along lines of tension and of compression are detected by the field at the shaft surface. Hysteresis measured for a quench-hardened steel shaft of 25 mm diameter under the applied torque from −490 to 490 Nm was reduced by about nine times and sensitivity increased by a factor of 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348200
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  • 4
    Electronic Resource
    Electronic Resource
    Low-frequency characteristic of the enhanced incremental permeability by magnetic shaking (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5583-5585 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to analyze the mechanism of magnetic shaking, the permeability and the energy losses for a small amplitude, low-frequency exciting field are studied under magnetic shaking in comparison with those under the normal condition (without shaking). The permeability and the energy losses were measured for a Metglas 2705M amorphous ribbon wound core by a lock-in technique in the frequency range of 1–20 Hz under both magnetic shaking (2.7 A/m, 1 kHz) and the normal condition. The effects of the magnetic shaking on the domain wall pinning, the mean wall velocity, and the number of the active walls are described. The strong frequency dependence of the enhanced incremental permeability even at low frequency is explained as a result of these effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345891
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  • 5
    Electronic Resource
    Electronic Resource
    Planar inductors with a new coil configuration (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5368-5368 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-frequency (f≥1 MHz) magnetic power devices are key elements for developing compact and low-profile switching power supplies. Planar inductors with a flat coil are investigated,1–3 however, a problem arising from the use of a flat coil is not addressed. The problem is that normal components to the magnetic plate inevitably exist in the exciting fields from a flat coil and that those components induce severe in-plane eddy currents. The problem is most typical in the case of a spiral coil. In this paper, a new flat coil is proposed (see Fig. 1) for planar inductors which greatly improves the problem because paths of eddy currents are chopped up corresponding to the mesh size of the coil. It is obvious that density of eddy currents becomes small when the mesh size becomes fine. Sandwich planar inductors with a proposed coil (mesh coil) and a meander one were prepared for preliminary tests using pairs of Metglas 2705M amorphous ribbons of 50×50 mm2 and 100-μm copper wires, where the mesh size was 3 mm, equal to the pitch of the meander coil. Inductances at 1 MHz were 1.85 μH for the mesh coil and 2.25 μH for the meander one, whereas Qmax=5 at 6 MHz for the mesh coil and 4.5 at 2 MHz for the meander one. Advantages of the mesh coil may further become clear when it is made on the magnetic plates with thin insulating layer in between by IC or thick-film process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348033
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  • 6
    Electronic Resource
    Electronic Resource
    Foucault imaging of superconducting fluxons (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4096-4103 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Foucault method, one of the classical Lorentz microscopy techniques, is here investigated in order to demonstrate its applicability to in-focus observations of superconducting fluxons. As the deflections involved are of the order of 10−5−10−6 rad, low-angle techniques, high brightness, coherent illumination, and a low aberration magnetic stage are needed. The first experimental results are presented and discussed in relation with a theoretical model for the fluxon which allows the interpretation of the main features of the observed patterns. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370317
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  • 7
    Electronic Resource
    Electronic Resource
    Regulation of l-DOPA Biosynthesis by Site-Specific Phosphorylation of Tyrosine Hydroxylase in AtT-20 Cells Expressing Wild-Type and Serine 40-Substituted Enzyme (1996)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 67 (1996), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: De novo l-DOPA biosynthesis was studied in stably transfected AtT-20 cells expressing wild-type- or [Leu40]-recombinant tyrosine hydroxylase (rTH). Basal rates of DOPA accumulation were much higher by cells expressing rTH in which Leu was substituted for Ser40 (S40L-rTH) than by those expressing wild-type rTH (WT-rTH). Treatment of WT-rTH cells with forskolin produced an increase in DOPA accumulation and a concomitant increase in WT-rTH phospho-Ser40 content, whereas DOPA production by cells expressing S40L-rTH was entirely unaffected by forskolin. After forskolin treatment of 32Pi-prelabeled cells, WT-rTH was phosphorylated at Ser8, Ser19, Ser31, and Ser40, whereas 32P incorporation into S40L-rTH was restricted to Ser8, Ser19, and Ser31. Relatively prolonged treatment of AtT-20 cells expressing WT-rTH with either a depolarizing agent (elevated potassium) or a phosphatase inhibitor (okadaic acid) increased DOPA production and increased the phosphorylation state of Ser40; but, unlike forskolin, these treatments also increased DOPA production by cells expressing S40L-rTH. Thus, the present studies demonstrate that Ser40 phosphorylation mediates forskolin-induced increases in DOPA biosynthesis directly but that mechanisms other than Ser40 phosphorylation can mediate the increases in DOPA biosynthesis produced either by depolarization or by protein phosphatase inhibition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1996.67020629.x
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  • 8
    Electronic Resource
    Electronic Resource
    Antibodies to a Segment of Tyrosine Hydroxylase Phosphorylated at Serine 40 (1995)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 64 (1995), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: A synthetic peptide corresponding to residues 32–47 of rat tyrosine hydroxylase (TH) was phosphorylated by protein kinase A at Ser40 and used to generate antibodies in rabbits. Reactivity of the anti-pTH32–47 antibodies with phospho- and dephospho-Ser40 forms of TH protein and peptide TH32–47 was compared with reactivity of antibodies to nonphosphorylated peptide and to native TH protein. In antibody-capture ELISAs, anti-pTH32–47 was more reactive with the phospho-TH than with the dephospho-TH forms. Conversely, antibodies against the nonphosphorylated peptide reacted preferentially with the dephospho-TH forms. In western blots, labeling of the ∼60-kDa TH band by anti-pTH32–47 was readily detectable in lanes containing protein kinase A-phosphorylated native TH at 10–100 ng/lane. In blots of supernatants prepared from striatal synaptosomes, addition of a phosphatase inhibitor was necessary to discern labeling of the TH band with anti-pTH32–47. Similarly, anti-pTH32–47 failed to immunoprecipitate TH activity from supernatants prepared from untreated tissues, whereas prior treatment with either 8-bromoadenosine 3′,5′-cyclic monophosphate or forskolin enabled removal of TH activity by anti-pTH32–47. Lastly, in immunohistochemical studies, anti-pTH32–47 selectively labeled catecholaminergic cells in tissue sections from perfusion-fixed rat brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1995.64052281.x
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  • 9
    Electronic Resource
    Electronic Resource
    Role of Serine-19 Phosphorylation in Regulating Tyrosine Hydroxylase Studied with Site- and Phosphospecific Antibodies and Site-Directed Mutagenesis (1998)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 71 (1998), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The effects of depolarization by elevated potassium concentrations were studied in PC12 cells and in stably transfected AtT-20 cells expressing wild-type or [Leu19]-recombinant tyrosine hydroxylase (rTH). Changes in the phosphorylation states of Ser19 and Ser40 in tyrosine hydroxylase (TH) were determined immunochemically using antibodies specific for the phosphorylated state of each site and compared with changes in TH activity in PC12 cell lysates and with changes in l-DOPA biosynthesis rates in intact AtT-20 cells. Treatment of either PC12 cells or AtT-20 cells expressing wild-type rTH with elevated potassium produced a transient increase in the phosphorylation state of Ser19 (up to 0.7 mol of phosphate/mol of subunit) in concert with a more gradual and sustained increase in Ser40 phosphorylation. Elevated potassium treatment also increased TH activity in PC12 cell lysates, but these increases paralleled the temporal course of Ser40, as opposed to Ser19, phosphorylation. Similarly, increases in DOPA accumulation produced by elevated potassium in AtT-20 cells expressing wild-type rTH paralleled the increases in the phosphorylation state of Ser40 but not Ser19. Moreover, elevated potassium produced comparable increases in DOPA accumulation in AtT-20 cells expressing rTH in which Ser19 phosphorylation had been eliminated (by substitution of Leu for Ser19). Thus, depolarization-induced increases in the stoichiometry of Ser19 phosphorylation do not appear to influence directly the activity of TH in situ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1998.71041670.x
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  • 10
    Electronic Resource
    Electronic Resource
    Effective shielding for low-level magnetic fields (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5696-5698 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An effective method of shielding slowly varying low-level magnetic fields is presented. The key of this method is the use of soft magnetic materials with a highly rectangular B-H loop and the application of the shaking field to them. Metglas 2705M amorphous ribbon of about 22 μm in thickness was used in the experiments since it has almost vertical flanks in the dc B-H loop in as-prepared state and small coercivity Hc∼0.5 A/m. A shielding factor of the cylindrical case with a copper pipe inside (diameter : 60 mm; length : 100 mm) and with two crossed layers of the ribbon outside was measured against low-level disturbing fields of 10 Hz applied transversely to the case. Although the shielding factor was as small as 3.5 without shaking, it became higher than 150 under the shaking field of 1 kHz, 2.9 A/m(rms). This value is far better than that with Mumetal or 4-79 Mo-Permalloy. A shaking frequency as high as 1 kHz or higher makes it easy to suppress the leakage of the shaking field into the shielded space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342278
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