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  • 1
    Electronic Resource
    Electronic Resource
    Simultaneous dysprosium- and lead-substituted high-Tc superconductor bismuth cuprates (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6347-6352 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The introduction of small amounts of Dy in ceramic BiSrCaCuO (BSCCO) with nominal composition of Bi2Sr2Ca1−xDyxCu2O8+z, Bi2Sr2Ca2−xDyxCu3O10+z, and Bi1.6Pb0.4Sr2Ca2−xDyxCu3O10+z with 0.1〈x〈0.3 was studied in both stoichiometric and nonstoichiometric compositions where the nonstoichiometric composition was used to aid the sintering process in order to obtain a maximum Tc and contained excesses of CaO and CuO. It was found that regardless of the sintering conditions and starting compositions only the Bi:Sr:Ca:Cu=2:2:1:2 (2212) phase was produced. The highest Tc (R=0) in the Dy-substituted sample obtained was 84 K and this was obtained only for the nonstoichiometric composition Bi1.6Pb0.4Sr2Ca2.5Dy0.3Cu3.5Ox which contained mostly the 2212 phase together with tiny amounts of Bi2Sr2Ca2Cu3Ox (2223) phase. High-resolution electron microscopy data performed on Bi1.6Pb0.4Sr2Ca2.5Dy0.3Cu3.5010+z show that the introduction of Dy in the original 2223 Pb-containing phase caused only the formation of the 2212 phase without changing the modulated structure known to occur in the substituted Bi and Sr BSCCO compounds confirming also earlier suggestions made by Tarrascon et al. [Phys. Rev. B 2, 4316 (1989)] that the rare-earth cations stabilize the 2212 phase and substitute only for Ca and not for the Sr or Bi sites in the 2212 phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346880
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  • 2
    Electronic Resource
    Electronic Resource
    Extraction of radio frequency from electromagnetic surface waves guided by metallic strips (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 551-553 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Pulses of rf radiation with power in the megawatt range was extracted from electromagnetic surface waves. These nonradiating waves propagated on a long and thin metallic strip with most of the wave energy confined to a distance of less than a half wavelength around the strip. The electromagnetic energy of the surface waves was first extracted into rectangular waveguides in a TE01 mode and then radiated into the atmosphere with an overall efficiency of 90%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150239
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  • 3
    Electronic Resource
    Electronic Resource
    Generation of a large diameter intense relativistic electron beam for the triaxial relativistic klystron amplifier (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3488-3493 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We built and tested a new electron beam generator that is capable of generating a 66 cm diameter annular intense relativistic electron beam of energy of 450 keV and current of 60 kA. The new generator incorporates a coaxial-to-triaxial mode converter which allows us to generate and (in the future) to propagate the electron beam between two coaxially grounded conductors. We designed the beam transport system to minimize the axial magnetic energy needed to confine the electron beam. An even lower impedance device can be built by scaling up the size, generating a higher electron beam current. This beam geometry (sheet beam) is useful for efficient generation of high power microwaves. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145459
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  • 4
    Electronic Resource
    Electronic Resource
    An immunohistochemical study of estrogen and progesterone receptors in adenocarcinoma of the endometrium and in the adjacent mucosa (1995)
    Suite 500, 5th Floor, 238 Main Street, Cambridge, Massachusetts 02142, USA : Blackwell Science Ins.
    International journal of gynecological cancer 5 (1995), S. 0 
    Details
    ISSN: 1525-1438
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The immunoperoxidase stain for estrogen and progesterone receptor content in endometrial adenocarcinoma was correlated with the grade and stage, level of myometrial invasion, age and survival of the patients. Anti-estrogen and anti-progesteone receptor monoclonal antibodies were applied to paraffin-embedded tissue from hysterectomy specimens of 100 patients with adenocarcinoma of the endometrium. In 34 of the cases the receptors were studied in the endometrium adjacent to the tumor and compared to the nuclear receptor content in the carcinoma. There was a high inverse correlation between the estrogen receptor status and the grade of tumor (R = − 0.45, P = 0.006). The estrogen receptor measured in the endometrium near the tumor showed a negative correlation with the grade of the tumor (R = −0.42, P = 0.013). The estrogen, but not the progesterone, receptor content, was positively related to the age of the patient (P 〈 0.05). No significant correlation of the receptor status with the depth of myometrial invasion was found, despite the obvious interdependence between the grade and myometrial invasion. The progesterone receptor staining index appeared to be a distinct independent prognostic factor in endometrial cancer. The immunohistochemical analysis of the steroid hormone status in endometrial cancer therefore offers an alternative to the quantitative ligand-binding assay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1525-1438.1995.05040275.x
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  • 5
    Electronic Resource
    Electronic Resource
    Propagation of an intense relativistic electron beam in an annular channel (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1263-1267 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of an annular intense relativistic electron beam inside a cylindrical drift tube is affected by many factors such as external magnetic field, drift tube geometry, the beam self electric and magnetic fields, etc. It is shown, experimentally and theoretically, that the deleterious influence of the self-fields on the electron flow can be reduced when part of the beam return current is allowed to flow on a grounded conductor that is inserted coaxially within the beam. The improvement manifested itself by reducing the axial magnetic field needed to confine the electron beam or alternately by lowering the electron transverse velocities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362976
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  • 6
    Electronic Resource
    Electronic Resource
    Erratum: Propagation of an intense relativistic electron beam in an annular channel [J. Appl. Phys. 80, 1263 (1996)] (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6064-6064 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363835
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  • 7
    Electronic Resource
    Electronic Resource
    Externally modulated intense relativistic electron beams (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3353-3379 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The physics of modulation of an intense relativistic electron beam by an external microwave source is studied in this paper via experiment, theory, and simulation. It is found that the self-fields of the electron beam, in general, intensify the current modulation produced by the external source. The linear and nonlinear theory, together with the simulation, show that the classical klystron description in the drift tube region is substantially modified by the beam's high density. In the modulating gap, electron bunches may be generated instantaneously without the necessity of propagating the beam through a long drift tube. These properties, which have no counterparts in low-density beams, lead to the generation of large amplitude, coherent, and monochromatic current modulation on an intense beam. The excellent amplitude stability and the phase-locking characteristics (〈2°) of the modulated current, demonstrated in experiments, open new areas of research in high-power microwave generation and compact particle accelerators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341521
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  • 8
    Electronic Resource
    Electronic Resource
    Behavior of high-voltage gaps in the presence of large space-charge fields (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1460-1465 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown in this paper that a high-voltage gap exhibits a nonlinear capacitance behavior in the presence of large space-charge fields. The existence of this nonlinear capacitor is quasi dc in nature and does not result from transit time effects, i.e., high-frequency effects. This nonlinear behavior can be used to tailor the shape of bunched intense relativistic electron beams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336076
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  • 9
    Electronic Resource
    Electronic Resource
    Generation of a high-power rf pulse in a rectangular waveguide (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 58-59 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: High-power rf radiation with a frequency of 800 MHz was extracted from a modulated intense relativistic electron beam into a rectangular waveguide. The rf extraction was limited to a rf power below 500 MW. Problems which prevent generation of higher power were identified and solutions offered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139567
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  • 10
    Electronic Resource
    Electronic Resource
    Efficient generation of multigigawatt rf power by a klystronlike amplifier (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 171-181 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article addresses the new development of high-power rf klystronlike amplifiers using modulated intense relativistic electron beams. Development of these amplifiers follows earlier research in which the interaction between a high-impedance (120-Ω) intense relativistic electron beam and a low-power rf pulse resulted in the generation of coherent bunches of electrons with excellent amplitude and phase stabilities. In the present experiment a low-impedance (30-Ω) large-diameter (13.2-cm) annular electron beam of power ∼8 GW was modulated using an external rf source (magnetron at 1.3 GHz) of 0.5 MW power. The interaction of the modulated electron beam with a structure generated a 3-GW rf pulse that was radiated into the atmosphere. The self-fields of the intense beam provided significant electrostatic insulation against vacuum breakdown at the modulating gaps and at the rf extraction gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141869
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