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  • 1985-1989  (6)
  • 1970-1974  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Dependence of magnetic properties of Co-Pt films on sputtering conditions (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4022-4024 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties, Young's modulus, and corrosion resistance of Co-Pt films deposited by targets-facing type of sputtering (TFTS) have been investigated. The films deposited at a Ar gas pressure PAr of 2 mTorr present good surface smoothness and dense texture. The c axis of the hexagonal crystallites in the film orients normal to the film plane. The films have nearly the same value of Young's modulus (≈17×1011 dyn/cm2) as that of the bulk Co-Pt alloy. On the other hand, the films deposited at PAr of 30 mTorr exhibit rough surface and columnar structure and do not exhibit any preferred orientation of crystallites. In addition, they have a small value of Young's modulus (≈5×1011 dyn/cm2) and poor corrosion resistance compared with the film deposited at low PAr. They have coercive force Hc larger than 1 kOe, which is mainly caused by their porous structure. Besides, the Co-Pt films have large in-plane uniaxial magnetic anisotropy, which is caused by both dc magnetic field applied to substrate during deposition and oblique incidence of sputtered particles upon substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334658
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of additional element (Fe, Zr, Ta) for Co-Cr films deposited by targets facing type of sputtering (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4019-4021 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to improve both magnetic properties and wear resistance of Co-Cr films for perpendicular magnetic recording media, the effect of the addition of a small amount of Fe, Zr, and Ta to the Co-Cr binary alloy films has been investigated. They were deposited with a targets facing type sputtering (TFTS) apparatus. (i) The addition of a small amount of Fe (〈5 at. %) causes a significant decrease of the effective perpendicular magnetic anisotropy K⊥ (K⊥=Ku−2πM2s). The K⊥ has a negative value at Fe content above 1 at. %. Consequently, the recording characteristics become worse as Fe content increases. (ii) The addition of Zr leads to a remarkable decrease of grain size and improvement of surface smoothness along with an increase of wear resistance. It also causes evident decrease in Ku and saturation magnetization Ms. However, both K⊥ and remanence ratio Mr⊥/Mr(parallel) are increased by the addition of a small amount of Zr up to 0.5 at. %, though they decrease steeply with further increase of Zr content above 1 at. %. (iii) The addition of Ta shows almost the same tendency as Zr for the film structure and wear resistance. It also causes the decrease of Ku. But the K⊥ increases with an increase of Ta content up to 0.5 at. % and takes nearly constant value at Ta content above 0.5 at. %, since the Ms of the film decreases remarkably as Ta content increases. Mr⊥/Mr(parallel) increases gradually from 2.5 to 3.6 as Ta content increases. Consequently, the addition of a small amount of Ta is effective for improving both recording characteristics and wear resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334657
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  • 3
    Electronic Resource
    Electronic Resource
    Ba–ferrite thin-film disk for perpendicular magnetic recording (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4040-4042 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The authors have prepared Ba–ferrite film disks and evaluated their magnetic read/write characteristics. The c-axis-oriented Ba–ferrite thin films were formed epitaxially on c-axis-oriented ZnO films by means of a targets-facing-type sputtering system. The direction of easy magnetization in the film with perpendicular crystalline anisotropy is almost perpendicular to the film plane. Thus, the perpendicular remanence is more than 60 times as large as the in-plane one. The simple Ba–ferrite films, however, have a coercive force, Hc⊥ above 2 kOe which is too large to write on by means of a conventional head. The substitution of In3+ in the Ba–ferrite films makes the Hc⊥ values decrease to about 1 kOe without increasing the critical temperature, Tcritical, of c-axis orientation. The read/write characteristics of the films were measured with a MnZn–ferrite ring head. The reproduced signal exhibits clear dipulsive waveforms as the dipulse ratio exceeds 0.7. Furthermore, the overwrite ratio decreases below −28 dB for the In3+-substituted Ba-ferrite film disk. The Ba–ferrite film disks have promising potential as a high-density perpendicular magnetic recording medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334664
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Further simultaneous hard X-ray and optical observations of Sco X-1 (1974)
    [s.l.] : Nature Publishing Group
    Nature 250 (1974), S. 38-40 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In our 1971 observations we found a positive correlation between the optical luminosity and the intensity of hard X rays at the optically enhanced phase of Sco X-l (refs 2 and 3). Although the optical enhancement seemed to be a flare, a rather poor time resolution of the photographic observation ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/250038a0
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  • 5
    Electronic Resource
    Electronic Resource
    Energy Spectrum of a Nova-like X-ray Source (1971)
    [s.l.] : Nature Publishing Group
    Nature 229 (1971), S. 31-33 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We now describe the results of further analysis of the data obtained in the same flight and the succeeding flight by the rocket, S-210, launched on the next day from the same place. We took special care in the fabrication and calibration of the X-ray detectors, and in the aspect analysis of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/229031a0
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  • 6
    Electronic Resource
    Electronic Resource
    Observation of cosmic soft X-rays (1971)
    Springer
    Astrophysics and space science 12 (1971), S. 104-117 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cosmic soft X-rays in the energy range between 0.14 and 7 keV were observed with thin polypropylene window proportional counters on board a sounding rocket. The field of view crossed the galactic plane in the Cygnus-Cassiopeia region at a large angle and reached the galactic latitudes of −55° and +30°. Referring also to the result with Be window counters, we obtained the energy spectrum of Cyg XR-2, the flux from the Cas A region and the distribution of the intensity of diffuse X-rays over the scanned region. The turn-over of the Cyg XR-2 spectrum at about 1 keV indicates that the distance of the Cyg XR-2 source lies between 600 and 800 pc, if the turn-over is due entirely to interstellar absorption. The flux from the Cas A region is obtained as 0.23±0.05 photons cm−2 sec−1 in the energy range between 1.1 and 4.1 keV. The intensity of diffuse soft X-rays depends on the galactic latitude more weakly than expected from the interstellar absorption of extragalactic X-rays and shows asymmetry with respect to the galactic equator, thus suggesting a contribution of galactic X-rays. The spectrum of extragalactic X-rays is approximately represented by a power lawE −1.8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656141
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  • 7
    Electronic Resource
    Electronic Resource
    Time variation of the X-ray spectrum and optical luminosity of SCO X-1 (1971)
    Springer
    Astrophysics and space science 12 (1971), S. 378-393 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results of rocket observations of SCO X-1 over the spectral range of 2∼20 keV are presented. The observations have been performed partly in India and partly in Japan under the collaboration of the three groups. The present results are compared with results of similar observations carried out by the LRL (Lawrence Radiation Laboratory) group. Some of these X-ray observations were accompanied by simultaneous optical observations. Relationships between the hardness of the X-ray spectrum and the X-ray intensity and between the hardness and the optical luminosity are compiled. The relationships among the parameters (temperature, density and size) which characterize the postulated isothermal cloud model of SCO X-1 are given. They indicate that SCO X-1 is characterized by a temperature of about 107–108K, a density of about 1016–1017 cm−3 and a radius of about 108–109 cm respectively. We further show that the temperature is inversely correlated with the size of the source; an increase in temperature corresponds to a decrease in the radius and an increase in density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651426
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  • 8
    Electronic Resource
    Electronic Resource
    The location and size of a solar hard X-ray burst on September 27, 1969 (1971)
    Springer
    Solar physics 16 (1971), S. 454-464 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The location and size of a solar impulsive hard X-ray burst have been determined in one dimension to a considerable precision with a balloon-borne X-ray modulation collimator. The center of the X-ray source is on the line passing through the center of a big Hα flare region of 3 arc min. The size of the X-ray source is remarkably smaller and may be one arc min or less.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162487
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  • 9
    Electronic Resource
    Electronic Resource
    Discovery of an unusual hard X-ray source in the region of supernova 1987A (1987)
    [s.l.] : Nature Publishing Group
    Nature 330 (1987), S. 230-231 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have been regularly observing SN1987A from the X-ray astronomy satellite Ginga1'2 since 25 February 1987, immediately following the optical discovery2'3. Ginga carries a set of proportional counters of 4,000 cm2 effective area and a field of view of 2°x4° full width. SN1987A (hereafter ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/330230a0
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  • 10
    Electronic Resource
    Electronic Resource
    In vitro analysis of lymphocyte functions in common variable immunodeficiency: heterogeneity in B-cell defects (1986)
    Springer
    European journal of pediatrics 145 (1986), S. 252-257 
    Details
    ISSN: 1432-1076
    Keywords: Common variable immunodeficiency ; T, B co-culture ; B-cell defect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Ten patients with common variable immunodeficiency were classified into three groups according to the number of circulating B-cells, i.e. B-cells being absent (three patients), very low (three patients) or within the normal range (four patients). The four patients in the last group showed significant proliferative responses to the T-independent B-cell mitogen, formalin-fixed Staphylococcus aureus, Cowan I. Further study of these patients by co-cultures with allogeneic T or B-cells in various combinations with pokeweed mitogen showed that two patients had an intrinsic B-cell defect without T-cell defect. The third patient had a T-cell dysfunction (i.e. his T-cell could only help the B-cells of some individuals) resulting in a defect in Ig production. The T-cells of the fourth patient showed poor helper function towards all controls. All six patients with absent or very low numbers of B-cells in group I and II had normal T-cell helper function. This study demonstrates that the immunological defect in common variable immunodeficiency is most often a B-cell defect at different stages of their differentiation with sometimes an additional T-cell dysfunction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439395
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