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  • Electronic Resource  (9)
  • 2000-2004  (6)
  • 1990-1994  (3)
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  • Electronic Resource  (9)
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  • 1
    Electronic Resource
    Electronic Resource
    Defect band behavior in p-Cd0.96Zn0.04Te by hydrogen passivation (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4077-4079 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence measurements were carried out in order to investigate the dependence of the optical properties of p-Cd0.96Zn0.04Te single crystals on hydrogen passivation conditions. After the p-Cd0.96Zn0.04Te was annealed at 500 °C in a Cd atmosphere for 5 h, the luminescence due to the recombination of the electrons in the conduction band with acceptors (eA°) and to the donor–acceptor pair (DAP) transitions disappeared. After the p-Cd0.96Zn0.04Te was hydrogenated, the intensity of the exciton luminescence increased so that the (eA°) and DAP peaks related to the Cd vacancies disappeared, and the defect band in the low energy range between 1.4 and 1.5 eV also vanished. These results indicate that hydrogen atoms passivated not only shallow donors but also deep acceptor impurities and that the hydrogen atoms were separated from the hydrogenated samples at 400 °C due to their thermal energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352833
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  • 2
    Electronic Resource
    Electronic Resource
    Dependence of the optical properties of p-CdTe and p-Cd0.96Zn0.04Te on the bromine concentration in a bromine-methanol etching solution (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4074-4076 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence measurements were carried out to investigate the dependence of the optical properties of p-CdTe and p-Cd0.96Zn0.04Te on various relative concentrations of bromine in a mixture of methanol and bromine. As the bromine concentration increased, the intensity of the luminescence increased; additionally, an exciton bound to a neutral acceptor (A°X) peak at 1.588 eV in p-CdTe was resolved into an exciton bound to neutral donor (D°X) peak at 1.592 eV and an A°X peak. The mixed bands of the 1.574 and 1.546 eV peaks were well resolved by using an etching bromine concentration of 2%; in particular, the intensities of the D°X and 1.574 eV peaks increased as much as five and seven times, respectively. The intensity of the peak at 1.48 eV related to defects also increased. The intensity of A°X at 1.609 eV in p-Cd0.96Zn0.04Te changed slightly with the bromine concentration. The intensities of the luminescence peaks due to the recombination of the electrons in conduction band with acceptors and to the defect relation did not vary. These results indicated that the number of Cd vacancies could be reduced due to the addition of Zn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352832
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  • 3
    Electronic Resource
    Electronic Resource
    Novel fabrication method of microchannel plates (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 4165-4169 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a novel microchannel plate (MCP) by introducing new materials and process technologies. The key features of our MCP are summarized as follows: (i) bulk alumina as a substrate, (ii) the channel location defined by a programmed-hole puncher, (iii) thin film deposition by electroless plating and/or sol–gel process, and (iv) an easy fabrication process suitable for mass production and a large-sized MCP. The characteristics of the resulting MCP have been evaluated with a high input current source such as a continuous electron beam from an electron gun and Spindt-type field emitters to obtain information on electron multiplication. In the case of a 0.28 μA incident beam, the output current enhances ∼170 times, which is equal to 1% of the total bias current of the MCP at a given bias voltage of 2600 V. When we insert a MCP between the cathode and the anode of a field emission display panel, the brightness of luminescent light increases 3–4 times by multiplying the emitted electrons through pore arrays of a MCP. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1319986
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  • 4
    Electronic Resource
    Electronic Resource
    Microchannel plate for high-efficiency field emission display (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1716-1718 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The efficiency of a field emission display was improved significantly with a newly developed microchannel plate. The key features of this unit and its fabrication are summarized as follows: (a) bulk alumina is used as a substrate material, (b) channel location is defined by a programed-hole puncher, and (c) thin film deposition is conducted by electroless plating followed by a sol–gel process. With the microchannel plate between the cathode and the anode of a field emission display, the brightness of luminescent light increases three- to fourfold by electron multiplication through an array of pores in the device. In addition, the fabricated microchannel plate prevents spreading of electrons emitted from the cathode tips, thus improving both display resolution and picture quality. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1309025
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  • 5
    Electronic Resource
    Electronic Resource
    Electrophoresis deposition of carbon nanotubes for triode-type field emission display (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1547-1549 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A triode-type field emission display has been fabricated using carbon nanotube emitters. Purified single walled carbon nanotubes were selectively deposited onto a cathode electrode in a triode-type structure by an electrophoresis. Emission current was modulated with gate potentials of 100–300 V. A high brightness of 1000 cd/m2 with uniform emission was obtained at 900 V at the anode and 200 V at the gate. The fluctuation of emission current was found to be less than 5% in a fully sealed field emission display. Selective deposition of carbon nanotubes by electrophoresis shows high feasibility for triode-type field emission displays. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1349870
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  • 6
    Electronic Resource
    Electronic Resource
    IL-18 Production in Human Pulmonary and Pleural Tuberculosis (2002)
    Oxford, UK : Blackwell Science Ltd
    Scandinavian journal of immunology 56 (2002), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Interleukin-18 (IL-18) has multiple important pro-inflammatory effects, including the induction of interferon-γ (IFN-γ) in various diseases. In this study, we investigated the IL-18-producing activities in human pulmonary and pleural tuberculosis (TB) in response to purified protein derivative (PPD) antigen (Ag) from Mycobacterium tuberculosis. The most significant IL-18 production was found in chronic refractory TB (CRTB) patients. However, IFN-γ production in CRTB patients was significantly less than that in healthy tuberculin reactors or in patients with tuberculous pleurisy (TBP). Elevated levels of both IL-18 and IFN-γ were found in pleural fluids from TBP patients. In vitro production of IL-18 was dramatically decreased following an 18 h stimulation with PPD. However, IFN-γ was markedly increased in pleural mononuclear cells from TBP patients after in vitro stimulation with PPD. The mesothelial cell type was the main source of pro-IL-18 in pleural cells from TBP patients, suggesting an important role for these cells in TBP. Taken together, these data indicate that IL-18 is elevated in peripheral blood mononuclear cells from CRTB patients, as well as at the site of TBP, indicating a possible role for IL-18 in both protective immunity and pathologic responses in human TB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3083.2002.01143.x
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of rebamipide on the expression of proinflammatory mediators and apoptosis in human neutrophils by Helicobacter pylori water-soluble surface proteins (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 18 (2003), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background : Helicobacter pylori infection elicits persistent neutrophil infiltration in gastric mucosa. The expression of cyclooxygenase (COX)-2 and inhibition of apoptosis in the neutrophils could contribute to the pathogenesis of H. pylori infection. Rebamipide, a mucosal protective and ulcer-healing drug, has been known to inhibit neutrophil activation.Aim : To evaluate the effect of rebamipide on the neutrophils activated by H. pylori water-soluble proteins.Methods : After neutrophils were stimulated with H. pylori water extract (HPWE) or pre-treated with rebamipide, the expression of COX-2 mRNA and protein was assessed by quantitative RT-PCR and Western blotting, respectively. Prostaglandin (PG) E2 synthesis was determined by radioimmunoassay. Neutrophil apoptosis was evaluated by cytosolic oligonucleosome-bound DNA ELISA and caspase-3 activity was measured by the detection of p-nitroanilide after cleavage from labelled substrate.Results : Stimulation with HPWE up-regulated COX-2 expression and PGE2 secretion, and inhibited neutrophil apoptosis. Rebamipide suppressed PGE2 secretion from neutrophils dose-dependently. Rebamipide, however, did not affect neutrophil apoptosis and caspase-3 activity.Conclusions : Rebamipide effectively suppressed PGE2 secretion from neutrophils activated by H. pylori water-soluble proteins. This is another possible mechanism of gastric mucosal protection by rebamipide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.18.s1.1.x
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  • 8
    Electronic Resource
    Electronic Resource
    Electrical properties of sol-gel processed PLZT thin films (1994)
    Springer
    Journal of materials science 29 (1994), S. 6599-6603 
    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 Sol-gel processed lanthanum-modified lead zirconate titanate (PLZT) thin films consisting of two different perovskite phase contents were fabricated on indium tin oxide coated Corning 7059 glass substrates with two different heating schedules: direct insertion at 650° C for 30 min and at 500° C for 2h. Optical transmittance spectra, polarization versus electric field curves, relative dielectric constant versus frequency and capacitance versus d.c. bias voltage curves of the samples were investigated. The samples showed a good transparency of over 70% and interference oscillation. A thin film consisting of mainly perovskite phase showed a slim loop hysteresis in the polarization versus electric field curve and in the capacitance versus d.c. bias voltage curve, indicating the presence of ferroelectric domains, but a film consisting of mainly pyrochlore phase did not. The dielectric constant and loss factor of the thin film consisting of mainly perovskite phase were about 90 and about 0.2, respectively, at relatively low frequency and showed dispersion of the dipolar polarization of permanent dipole moment in the ferroelectric perovskite phase in the frequency range between 10 kHz and 1 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354027
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of gravity on the interaction between pore and solid/liquid interface (2000)
    Springer
    Journal of materials science 19 (2000), S. 717-719 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006735316744
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