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  • 1995-1999  (4)
  • 1945-1949  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4918-4920 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Yoke giant magnetoresistance (GMR) heads are of interest for ultrahigh density recording. To optimize the design and efficiency of these heads, a comprehensive model was developed in which the total efficiency is the product of ratios of several fluxes in the head structure. The model consists of a network of shunt reluctances, which provide flux paths between the top and bottom yoke films, and series reluctances, which represent the yoke and GMR sensor films plus yoke-sensor overlap contacts. Expressions for individual reluctances are derived from a transmission line analysis of variable gap head segments, the series reluctances of magnetic films, and an analysis of flux leakage between the yoke and sensor films. A sensitivity analysis was performed for several parameters. The efficiency was found to be sensitive to the throat height and the planar area of the yoke-sensor contact. The model predicts a 53.6% efficiency for a 10 Gbit/in.2 head with a 1 μm throat height and a 2 μm yoke-sensor overlap. Assuming a GMR sensitivity of 0.2%/Oe and the above efficiency, a 580 μV p-p output will result from a 0.5 memu/cm2 media. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2300-2302 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: This letter addresses the temperature dependence of some of the electrical properties of 0.2-μm-thick SrBi2Ta2O9 capacitors with platinum electrodes on silicon wafers for nonvolatile memory applications. Investigations of the remanent polarization, the nonvolatile polarization and the coercive field with pulse amplitude were made at different temperatures. The endurance of the polarization as a function of temperature is reported. Up to 125 °C, the capacitors show less than a 10% reduction in polarization from their initial values following 1×1012 cycles. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3890-3894 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Experimental and modeling results for resistance degradation in thin Ba0.5Sr0.5TiO3 (BST) film capacitors with platinum (Pt) electrodes are reported. The main experimental results are as follows. Under a constant applied voltage, the current density is observed to increase with time until it reaches a maximum value. Once the maximum value is reached, the current density becomes constant with time. The barrier height at the BST/Pt (cathode) interface is observed to decrease after prolonged electrical stressing. The resistance degradation effect is observed to be reversible, particularly at elevated temperatures. Based on the experimental results, a quantitative model for resistance degradation is proposed. In this model, the increase in the current density is attributed to a decrease in the barrier height at the cathode and this decrease is assumed to have a stretched exponential dependence on time. Using experimentally determined parameters, the model calculates the current density as a function of time at various temperatures. The calculated results are verified and the model is shown to be self-consistent. Hence the model provides an accelerated method for determining the lifetime of thin BST films at the operating conditions for advanced memory applications. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 155 (1945), S. 424-425 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IT is well understood that the mechanisms of the oxidation of oils1, the curing of rubber2, the polymerization of unsaturated compounds3, the overall combustion of higher hydrocarbons4, as well as of certain biological ...
    Materialart: Digitale Medien
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  • 5
    ISSN: 1432-2218
    Schlagwort(e): Laparoscopy ; Surgery ; Fundoplication ; Esophagitis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract From September 1991 to January 1995 we performed 230 Nissen fundoplications by a laparoscopic technique. Whilst a loose 360° fundoplication secured by 3 or 4 sutures was performed in all instances, there was variation between surgeons regarding the performance of hiatal repair and division of short gastric vessels; 207 operations were completed laparoscopically and 23 were converted to an open operation when a satisfactory wrap could not be achieved. Operating time ranged from 30 to 260 min (median 95) and the median postoperative stay was 3 days (1–19). Twenty-three patients (10%) underwent a subsequent operation (14 within 3 months of the original surgery), 2 for recurrent reflux, 10 for para-esophageal herniation, 2 for a misplaced fundoplication resulting in gastric obstruction, 7 for persistent dysphagia (4 due to stenosis of the esophageal hiatus), 1 for bleeding, and 1 for mesenteric thrombosis. (This patient died.) Five other patients were readmitted to hospital subsequent to their discharge—four because of pulmonary emboli and one because of gastric obstruction. Some 226 patients (98%) are free of reflux symptoms with follow-up ranging up to 40 months (median 16). Absence of reflux and the integrity of the fundoplication has been confirmed by postoperative esophageal manometry and pH monitoring in 90 patients, and by barium meal in 126. Postoperative recovery has been quick and wound-related morbidity minimal. Although the rate of surgical revision was significant in this series, the likelihood of complications or further surgery, as well as incidence of conversion to open surgery, decreased in the second half of the experience. Strategies developed to improve the outcome now include routine posterior closure of the hiatus, early postoperative barium-meal examination, and minimization of diathermy dissection. A loose fundoplication is always constructed over a large bougie. The need for division of the short gastric vessels in laparoscopic fundoplication remains controversial and awaits the outcome of a randomized trial.
    Materialart: Digitale Medien
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