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  • 1
    Digitale Medien
    Digitale Medien
    Electrical characteristics for solid C60/GaN heterojunctions (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6935-6937 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Solid C60/n-GaN heterojunctions have been fabricated and their electrical properties have been studied. It has been found that the heterojunction is a strongly rectifying contact with a rectification ratio greater than 106 and with an ideality factor close to 1. The current–temperature measurement shows an exponential decrease of current with increasing reciprocal temperature, from which the effective barrier height is determined to be 0.535 eV. The series resistance measured decreases with increasing forward voltage and finally tends to be constant. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370499
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  • 2
    Digitale Medien
    Digitale Medien
    Formation of etch pits during carbon doping of gallium arsenide with carbon tetrachloride by metalorganic vapor-phase epitaxy (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 318-324 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Scanning tunneling microscopy was used to examine the effects of carbon tetrachloride concentration and temperature on the morphology of carbon-doped gallium arsenide films grown by metalorganic vapor-phase epitaxy. Deposition was carried out at 505–545 °C, a V/III ratio of 75, and IV/III ratios between 0.5 and 5.0. The growth rate declined monotonically with increasing carbon tetrachloride concentration. Step bunching and pinning was observed at a IV/III ratio of approximately 2.5. Increasing this ratio further resulted in the formation of pits ranging from 20 to 50 nm in diameter. These results can be explained by two competing processes that occur at the step edges: (1) the reaction of chlorine with adsorbed gallium from the group III precursor, and (2) the reaction of chlorine with gallium arsenide. Both reactions desorb gallium chlorides and reduce the growth rate, but only the latter reaction produces pits. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370731
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  • 3
    Digitale Medien
    Digitale Medien
    Design of an electronic charged particle spectrometer to measure 〈ρR〉 on inertial fusion experiments : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 589-592 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The design and fabrication of a new diagnostic that measures the energy spectra of charged particles from targets on the Omega Upgrade are actively underway. Using seven 512×512 charge coupled devices (CCDs) and a 7.5 kG permanent magnet, this instrument will uniquely determine particle identities and measure particle energies from 1 MeV up to the maximum charged particle energies of interest for ρR measurements (10.6 MeV knock-on tritons, 12.5 MeV knock-on deuterons and 30.8 MeV tertiary protons). The resolution of the diagnostic will be better than 5%. We have tested the response of SITe back-illuminated CCDs to 1.2–13.6 MeV protons from our Cockcroft–Walton accelerator and to alpha particles from an Am241 source, and the results agree extremely well with predictions. With its high density picture elements, each CCD has 105 single-hit detectors. In the case of a low DT yield of 109 neutrons, about 100 knock-on charged particles will be detected when the spectrometer aperture is 60 cm from the implosion. Measurements of ρR up to 150 mg/cm2 can be obtained from knock-on D and T spectra, and values up to 300 mg/cm2 can be determined from secondary proton spectra. The sensitivity of the CCDs to 14 and 2.5 MeV neutrons has been experimentally determined using our Cockcroft–Walton accelerator source and indicates that by incorporating neutron shielding, the signal to neutron noise ratio at a yield of 1011 will be better than 100:1. In the development phases of this program, we plan to utilize CR-39 track detectors concurrently with the CCDs. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1147660
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  • 4
    Digitale Medien
    Digitale Medien
    Comparative study of x-ray sources characterizing x-ray instrumentation : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 697-699 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A study of x-ray sources for the purpose of characterizing x-ray instrumentation is presented. Specifically, in the soft x-ray wavelength region, we compare a proton-induced x-ray emission (PIXE) source to a conventional electron-beam x-ray source, and to a radioactive α fluorescence x-ray source. We find that PIXE has intense line radiation with respect to background continuum [C. K. Li et al., Rev. Sci. Instrum. 63, 4843 (1992)]. This desirable feature, as well as others, will make PIXE potentially a useful tool for characterizing x-ray detectors, optics, and filter. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146261
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  • 5
    Digitale Medien
    Digitale Medien
    Measurements of charged-particle fusion yields and ratios from Omega (abstract) : 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. 1225-1225 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We have recently conducted a series of experiments on Omega in which we utilized a charged-particle spectrometer. It consists of a 7.6 kG magnet, CR-39 track for particle detection, and an assortment of range filters to either discriminate against or emphasize certain particles. Because of excellent particle selectivity and energy resolution, the spectrometer can accurately measure the ratios of various fusion products from a single shot. Among other uses, these ratios will be used to determine ion temperatures.© 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1149458
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  • 6
    Digitale Medien
    Digitale Medien
    Two types of ion gun equipped sputter-initiated resonant ionization and time-of-flight mass spectroscopy and its application in microanalysis of minerals (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1519-1522 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An apparatus, based on sputter-initiated resonant ionization spectroscopy and combined with time-of-flight mass spectroscopy, has been recently developed for microanalysis of mineral samples and other solid materials. This equipment has two kinds of ion gun, which make it possible to do more convenient and accurate microanalysis of complicated mineral samples. With this apparatus, detection and size measurement of fine gold grains trapped in pyrite at low concentrations have been carried out. The detection limit of this apparatus for gold is 73 ppb. The apparatus also has the function of secondary electron imaging. This gives very helpful information for geologists to evaluate the inborn state of gold in mineral samples and to improve the extraction rate of gold from minerals. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1148789
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  • 7
    Digitale Medien
    Digitale Medien
    139
Antimicrobial Activity of Synthetic Cationic Steroids on Burn Wound Pathogens (2005)
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc.
    Wound repair and regeneration 13 (2005), S. 0 
    Details
    ISSN: 1524-475X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Sepsis remains the single most important cause for multiple organ failure and death following burn injury for which no effective treatment is currently available. Burn injury is associated with immunosuppression which promotes sepsis. Studies from our laboratory have demonstrated that levels of the antimicrobial peptide (AMP), human β-defensin-2, was significantly decreased in burned skin epithelia, absent in burn blister fluid and poorly expressed in lung during inhalation injury.We hypothesize that 1) deficient antimicrobial peptides in burn wound promote progressive colonization of pathogens in burn wounds and 2) replacing active peptide components will restore the antimicrobial activity in burn wounds. We have synthesized several cationic steroid antimicrobials (CSAs) which mimic naturally occurring AMPs functionally. In vitro experiments using one of these synthetic drugs with locally isolated common burn pathogen P. aeruginosa and S aureus demonstrate MIC values of 2.0 ± 0.3 μg/ml and 0.4 ± 0.1 μg/ml, respectively, indicating effectiveness of these compounds against burn pathogens. These drugs were tested for cytotoxicity on cultured human keratinocytes using MTT cell viability assay. Results indicate that these drugs are nontoxic to cultured keratinocytes at the level required for bacterial killing. Since theses drugs are membrane active compounds it will be hard for bacteria to develop resistance and there is a great potential to be developed for clinical treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1067-1927.2005.130216aq.x
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  • 8
    Digitale Medien
    Digitale Medien
    Dyschromatosis universalis hereditaria: two cases in a Chinese family (2005)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 30 (2005), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Two cases of dyschromatosis universalis hereditaria (DUH) from a Chinese family are presented. Case 1 was a 62-year-old woman who had a generalized and progressive hyper- and hypopigmentation of the skin from the age of 8 years. Her brother had also developed a similar skin pigmentary defect from about the same age. Histopathological and ultrastructural examination of lesional skin showed increased melanin content in epidermal keratinocytes but no changes in the appearance or number of melanocytes. Although hereditary defects may influence melanogenesis resulting in a pigmentary anomaly, the pathogenesis of DUH remains unclear.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2230.2005.01823.x
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  • 9
    Digitale Medien
    Digitale Medien
    Metal/polymer interface adhesion by partially ionized beam deposition (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5759-5764 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: It is shown that a peel strength of larger than 70 g/mm adhesion can be achieved between Cu and Parylene-N surfaces using the partially ionized beam (PIB) deposition technique while the conventional deposition techniques such as thermal evaporation, e-beam evaporation, and sputtering give no measurable adhesion. With the PIB process, neither an adhesion enhancement layer nor substrate pretreatment is required. In the PIB deposition, up to 5% of self-ions and 3 kV substrate bias were used during deposition. Secondary-ion-mass spectroscopy revealed a Cu–Parylene-N intermixed layer located at the Cu/Parylene-N interface. It is proposed that the mechanical interlocking provided by the graded interface region may play a role for the observed adhesion enhancement. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363630
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  • 10
    Digitale Medien
    Digitale Medien
    Gain bandwidth and noise characteristics of millimeter-wave YBa2Cu3O7 hot-electron bolometer mixers (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1727-1729 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Conversion gain bandwidth and noise characteristics are reported for lattice-cooled superconducting YBa2Cu3O7 hot-electron bolometers acting as low-power, wide-bandwidth heterodyne mixers at 75 and 585 GHz. Near 77 K, these mixers show intrinsic conversion gain as high as −16 dB using ∼1 μW of local oscillator power. The measured gain bandwidth is well described by a single Lorentzian with −3 dB frequency of 5–9 GHz. Measurements of output noise combined with conversion gain indicate an optimal input noise temperature of ∼5000 K, significantly lower than calculations predict. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.122268
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