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  • Electronic Resource  (6)
  • 1995-1999  (2)
  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Performance and operation of a beam chopping system for a cyclotron with multiturn extraction (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 1714-1719 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A beam chopping system for a cyclotron is in operation at the JAERI cyclotron facility. A combination of a pulse voltage chopper in the injection line and a sinusoidal voltage chopper after the exit of the cyclotron is adopted to produce beam pulses spaced at 1 μs–1 ms intervals from natural cyclotron beams. The chopping system was designed according to a simple formulation of the chopping process in which the multiturn extraction was taken into account. Performance of the chopping system was experimentally proved to satisfy requirements of the design. In actual operation to produce beam pulses at long intervals, however, the number of the multiturn extraction is usually larger than the assumed value in the design because of a large phase acceptance of the cyclotron. Careful tuning of the acceleration phase width or the base magnetic field of the cyclotron is necessary to reduce it. It is essential to strictly define the acceleration phase of injected beams in the central region of the cyclotron to improve this situation. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147980
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  • 2
    Electronic Resource
    Electronic Resource
    Photographic Observations of the 1996 Leonid Fireballs in Japan (1997)
    Springer
    Earth, moon and planets 77 (1997), S. 47-54 
    Details
    ISSN: 1573-0794
    Keywords: Meteors ; meteor showers ; individual (Leonids) ; comets ; dust trail
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Several Leonid fireballs were successfully photographed by the Japanese Fireball Network and by other observers in Japan on 16 November, 1996. A totals of seven of these were simultaneously observed from two or more stations, from which the orbital and physical data were deduced. The radiant of these fireballs were very small, only 0.1°, similar to that of the 1991 Perseids. The 1996 Leonids showed a lower magnitude distribution index similar to those obtained in the 1961 and 1965 Leonids. All of these showers occurred before perihelion passage of the parent comet. We conclude that we have already encountered the elongated front part of the dust trail of the Leonid parent comet, where the trail is probably composed of larger dust particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006118927770
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  • 3
    Electronic Resource
    Electronic Resource
    Merging of two galaxies with central black holes (1991)
    [s.l.] : Nature Publishing Group
    Nature 354 (1991), S. 212-214 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The hypothesis7'8 that most elliptical galaxies are formed by the merging of spiral galaxies is strongly supported by recent observations9"12. N-body simulations have shown that merging of two spiral galaxies produces elliptical galaxies4. Such simulations have not, however, been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/354212a0
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  • 4
    Electronic Resource
    Electronic Resource
    Hepatocellular carcinoma with tumor thrombus in the inferior vena cava and right atrium (1994)
    Springer
    Abdominal imaging 19 (1994), S. 313-316 
    Details
    ISSN: 1432-0509
    Keywords: Hepatocellular carcinoma ; Tumor thrombus ; Inferior vena cava ; Right atrium ; Brain metastasis ; Computed tomography ; Magnetic resonance imaging ; Angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Tumor thrombus (TT) in the inferior vena cava (IVC) and right atrium (RA) is rarely encountered. We have diagnosed before death and treated a case of hepatocellular carcinoma (HCC) with TT in the IVC and RA, accompanied by a brain metastasis. The image characteristics on computed tomography (CT), magnetic resonance imaging (MRI), and conventional angiography are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198186
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  • 5
    Electronic Resource
    Electronic Resource
    Disposition and metabolism of KW-2149, a novel anticancer agent (1993)
    Springer
    Cancer chemotherapy and pharmacology 32 (1993), S. 143-150 
    Details
    ISSN: 1432-0843
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract KW-2149 is a new derivative of mitomycin C (MMC). The plasma concentrations, distribution, metabolism, and excretion of [3H]-KW-2149 in normal and tumor-bearing mice after i. v. administration of 16.6 mg/kg were investigated. The plasma radioactivity decreased biexponentially after i. v. administration in normal mice. However, the unchanged drug disappeared rapidly, showing a half-life (t 1/2) of 9.7 min, which was shorter than MMC's (18 min). The radioactivity was excreted in mouse urine (33%) and feces (58%) within 144 h. High radioactivity was distributed in the gallbladder, liver, kidney, pancreas, and lung at 1 h after i. v. administration to normal mice. The tumor concentration was lower than the plasma or blood concentration. The lowest radioactivity was observed in the brain. The metabolic rate of KW-2149 was very rapid. The methyl sulfide form (M-16), the symmetrical disulfide dimer (M-18), and the albumin conjugate were detected in plasma, which possessed anticellular activity. The specific anticellular activity of these compounds against uterine carcinoma (HeLa S3) was 1/100, 1, and 1/20 respectively, as compared with that of KW-2149.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00685618
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  • 6
    Electronic Resource
    Electronic Resource
    Application of thermography to the deforming process of paper materials (1993)
    Springer
    Journal of materials science 28 (1993), S. 4549-4552 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method is described, in which infrared thermography is used to detect changes in the temperature image occurring in paper during a tensile test. Thermography has been found to be useful instead of calorimetry for detecting the local variations in surface temperature and the thermal energy transfer in paper under strain. The changes in temperature images during the course of tensile straining can facilitate the study of the local deformation process of paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414241
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