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  • Electronic Resource  (40)
  • 1995-1999  (22)
  • 1990-1994  (18)
  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of a novel ion energy spectrum f(E(parallel),E⊥) analyzer in measurements of plasma flow in a magnetic mirror throat : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 853-856 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The new ion energy analyzer is developed to measure the energy distribution function f(E(parallel),E⊥) of ions lost along the confinement magnetic field [M. Okubo et al., J. Plasma Fusion Res. 70, 1102 (1994)]. The end-loss ions have larger E⊥ components compared with their E(parallel) components in the magnetic mirror throat. In this case, the ion energy distribution function is distorted because of the incident angle dependency of the retarding grid transmission. We try to compensate a measured energy distribution function by calculated grid transmission functions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149446
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  • 2
    Electronic Resource
    Electronic Resource
    Triplet exciton formation due to interaction between singlet excitons in polydiacetylene (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 7404-7416 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The time-resolved spectroscopy in polydiacetylene single crystals (PDA-MADF {poly-1-[3-(methylamino)phenyl]-4-[3,5-bis(trifluoromethyl)phenyl]-1, 3-butadiyne}) on femtosecond and picosecond time scales was performed. The time dependence of the photoinduced reflectance change in PDA-MADF exhibits three components with lifetimes ∼200 fs, 1–2 ps, and (very-much-greater-than)200 ps. These components are assigned to the free 1Bu excitons, self-trapped excitons, and triplet excitons. From the excitation intensity dependence of the reflectance change, a significant role of bimolecular interactions between singlet excitons for the formation of triplet excitons is clarified. A model of the mechanism of triplet exciton formation after the creation of singlet excitons is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465721
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical simulation of magnetic compression on a field-reversed configuration plasma (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4672-4678 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-dimensional magnetohydrodynamic (MHD) simulation of an axial magnetic compression on a field-reversed configuration (FRC) plasma is carried out for the parameter range of a corresponding experiment conducted on the FRC Injection Experiment (FIX) [S. Okada et al., 17th IAEA Fusion Energy Conference 1998 (International Atomic Energy Agency, Vienna) (in press)]. The simulation results show that during the initial stage of the magnetic compression the front part of the FRC plasma is mainly compressed radially, and that after this stage, the compression is primarily axial. Of particular interest is expected that the closed magnetic flux surfaces of the FRC can be retained without any degradation during the magnetic compression process. Further, it is observed in the simulation that the axial magnetic compression enables a transition of the MHD equilibrium from a long and thin to a short and fat FRC. The effects of this magnetic compression on FRC plasmas are discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873753
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  • 4
    Electronic Resource
    Electronic Resource
    Particle end loss in the edge plasma of a field-reversed configuration (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 3649-3655 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma parameters, particle end loss flux, flow velocity, and pressure are measured using a radial array of magnetic probes and directional electrostatic probes, in order to investigate particle loss processes in the edge layer of a field-reversed configuration (FRC). A plasma flow toward the end region is detected outside the separatrix between the axial midplane and the end region. The exhaust flow is also found in the end region. These results imply that particles are lost radially across the separatrix and then axially to the end. Measured flow velocity in the end region agrees within an error of 20% with the fluid-theory prediction, in which isentropy and axial momentum balance along magnetic flux tubes are assumed. The existence of the sonic condition in the end region is also suggested, analogous to ordinary fluid flow in a nozzle. The magnetic flux embedded in the edge layer of the confinement region and in the end region agrees within an error of 30%. These results indicate the applicability of the magnetohydrodynamics (MHD) theory for particle end loss. The end loss time along the open field agrees with the MHD prediction within an error of 20%. The measured particle loss flux from the end region is explained by the MHD theory within an error of 20%. The plasma outside the separatrix is considered to behave as hydrodynamic flow through the magnetic loss channel, contrary to the previous work [L. C. Steinhaur, Phys. Fluids 29, 3379 (1986)]. It seems that the magnetic mirror field improves the particle confinement in the edge plasma of the FRC and thus assist the FRC confinement as previously predicted [Slough et al., Nucl. Fusion 24, 1537 (1984)]. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873083
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  • 5
    Electronic Resource
    Electronic Resource
    Flux confinement measurements in large field-reversed configuration equilibria (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1706-1708 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The poloidal magnetic flux φ in large field-reversed configuration plasmas is examined experimentally. A wide range of initial equilibrium conditions, with 1≤φ≤8 mWb, is produced by varying the reverse bias magnetic field strength. The flux confinement time τφ at first improves with bias, albeit with field-null resistivities an order of magnitude larger than classical. A further increase in bias results in a reduction of τφ, which is inconsistent with either classical or anomalous diffusion theory. The data suggest the importance of nondiffusive processes such as instabilities or formation dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859443
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  • 6
    Electronic Resource
    Electronic Resource
    Nucleation and growth mechanism of hemispherical grain polycrystalline silicon (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2607-2609 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of the nucleus [Watanabe et al., Extended Abstracts of the 22nd Conference on Solid State Devices and Materials (1990), p. 873] is performed at low O2 partial pressure during annealing and the density of HSG nuclei increases as the annealing time becomes longer. HSGs grow upward from the amorphous silicon surface, and twin formations are generated in almost all the HSGs. For approximately 50% of whole HSGs, polycrystalline silicon grows downward from the bottom of the HSG. A common heterogeneous material both for the nucleus formation of HSG and for that of polycrystalline silicon growing downward is thought to be formed at the interface between HSG and polycrystalline silicon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106923
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  • 7
    Electronic Resource
    Electronic Resource
    Pulse modulated electron cyclotron resonance plasma for chemical vapor deposition of diamond films (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 1602-1604 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulse operation of electron cyclotron resonance plasma was performed for the fabrication of diamond films by chemical vapor deposition. With square wave amplitude modulation of microwaves at 500 Hz in frequency, the growth rate became twice as large as one of continuous operation with the same microwave power. Time resolved measurement of the optical emission from the pulse modulated plasma was also carried out. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113865
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  • 8
    Electronic Resource
    Electronic Resource
    Proton MR Spectroscopy in Solvent Abusers (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 801 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb17466.x
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  • 9
    Electronic Resource
    Electronic Resource
    Renal cysts and associated renal tumours in male ddY mice injected with ferric nitrilotriacetate (1995)
    Springer
    Virchows Archiv 427 (1995), S. 91-99 
    Details
    ISSN: 1432-2307
    Keywords: Ferric nitrilotriacetate ; Renal proximal tubules ; γ-glutamyltranspeptidase ; Renal cysts ; Renal tumours
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In experiments using ferric nitrilotriacetate (Fe-NTA) as a renal carcinogen, multiple renal cysts are often observed in addition to renal tumours. In the present study, we used 3-week-old male ddY mice and examined the relation between renal cysts and cancer development. Four months after the start of Fe-NTA administration, we observed cysts in the renal cortex in all Fe-NTA-treated mice, but not in Fe-free NTA-treated mice. Three types of cysts were observed, but only those which originated from the renal proximal tubules showed multi-layered or papillary growth of cyst epithelial cells. Using histochemical staining, we found a cyst formation-tumour induction sequence, and the supposed cystic-papillary tumour induced by Fe-NTA was of proximal tubular cell origin. We also found that the minimum dose of Fe-NTA capable of inducing renal tumours in ddY mice was 10 mg of iron/kg/day, four times in 2 weeks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203743
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  • 10
    Electronic Resource
    Electronic Resource
    Inverse dose-rate effect of DNA breaks and inactivation of transforming activity induced by tritiated water and60COγ-rays (1992)
    Springer
    Radiation and environmental biophysics 31 (1992), S. 299-310 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary When an aqueous solution of plasmid DNA at a constant low concentration of 5 µg/cm3 was irradiated with60Coγ-rays, D37 dose of single-strand breaks was decreased from 18 Gy at a dose-rate of 6.77 Gy/h of acute irradiation to 2.3 Gy at a dose-rate of 0.00212 Gy/h. OrG value was increased from 0.0010 to 0.0081. Similar dose-rate dependency of D37 dose andG value were also found when the plasmid DNA solution was treated with various concentrations of tritiated water at various dose-rates, ranging from 5.13 Gy/h to 0.000118 Gy/h. RBE of tritiumß-rays for single-strand breaks was ranged from 0.3 to 0.5 in a wide range of dose-rates. When the DNA solution was saturated with argon to remove oxygen, the dose-rate dependency ofγ-rays was abolished and that of tritiumß-rays was significantly supressed. When the DNA solution in air was kept at 4° C for 50 h or 25 days after acute irradiation, theG value of DNA breaks was the same as that kept at —20° C for the same period, but much lower than that of the solution irradiated for the same period at a lower dose-rate to give the same total doses. This shows that the inverse dose-rate effect could not be induced from the different exposure periods but from continuous irradiation of different dose-rates. The inverse dose-rate effect for inactivation of transforming activity of DNA irradiated with tritiated water was also observed in the range from 0.0588 Gy/h to 0.00118 Gy/h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01210210
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