ZIB

1

Digitale Medien

Detection of a 10−4 helium peak in a deuterium atmosphere using a modified high-resolution quadrupole mass spectrometer (1994)

Hiroki, S. ; Abe, T. ; Murakami, Y.

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 65 (1994), S. 1912-1917

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: This paper describes how a small helium (4He) peak can be separated from a large adjacent deuterium (D2) peak using a modified quadrupole mass spectrometer (QMS). This QMS utilized a condition of the second stability zone (zone II) in the Mathieu diagram. The minimum detectable peak ratio of 4He to D2 was 10−4 when a mass scan line was set close to the upper tip, and was 10−3 when the scan line was adjusted to the lower tip. The ion transmission rates simulating the peaks were calculated for the upper and lower zone conditions. It was found that a longer peak tail occurs when an unstable orbit has mainly a cosh function. From the experimental and theoretical data, it is concluded that the upper zone condition is the most suitable for realizing a high-resolution peak.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1144842

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2

Digitale Medien

Effect of bulk microdefects induced in heat-treated Czochralski silicon on dielectric breakdown of thermal SiO2 films (1994)

Satoh, Y. ; Murakami, Y. ; Furuya, H. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 64 (1994), S. 303-305

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We examine the effect of bulk microdefects (BMD) intentionally introduced in Czochralski silicon substrates by heat treatment on the dielectric breakdown of thermally grown SiO2 films. Transmission electron microscope observations reveal that the BMD consist of oxygen precipitates, perfect dislocation loops, and faulted dislocation loops. When the BMD are incorporated into the SiO2 film during thermal oxidation, an apparent decrease in the breakdown field is observed. The size of the oxygen precipitates has a clear relationship with the breakdown field: larger oxygen precipitate causes greater degradation. The dislocation loops are unrelated to the breakdown field.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.111186

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3

Digitale Medien

Preparation of ultrafine RuO2 and IrO2 particles by a sol-gel process (1994)

Murakami, Y. ; Tsuchiya, S. ; Yahikozawa, K. ; [weitere]

Springer

Journal of materials science 13 (1994), S. 1773-1774

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ISSN: 1573-4811

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00776354

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4

Digitale Medien

Analysis of stress intensity factors for three-dimensional cruciform cracks (1994)

Murakami, Y. ; Sakae, C.

Springer

International journal of fracture 66 (1994), S. 339-355

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ISSN: 1573-2673

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract The stress intensity factors for three-dimensional cruciform surface cracks in a semi-infinite body are numerically calculated by the body force method. Mindlin's point force solution is used for the derivation of basic equations to express the influence coefficient of triangular elements, into which the crack is divided. The interactions between crossed crack planes as well as contact between crack surfaces are considered in the iterative manner. Stress intensity factors for a cruciform median crack and a cruciform semicircular crack under a point force on the surface of a semi-infinite solid are analyzed. The possibility of growth of a median crack toward the free surface of the semi-infinite solid is discussed. A cruciform semicircular surface crack under remote uniaxial tension, or under combined tension and compression is also analyzed. The effect of contact of crack surfaces on stress intensity factors is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00018438

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5

Digitale Medien

Gastrointestinal invasion by herpes simplex virus type 1 inoculated cutaneously into the immunosuppressed mice (1994)

Takase, H. ; Yamamura, E. ; Murakami, Y. ; [weitere]

Springer

Archives of virology 134 (1994), S. 97-107

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ISSN: 1432-8798

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary The pathogenesis of infection in mice with herpes simplex virus type 1 (HSV-1) strain 7401H was studied. Mice immunosuppressed by intraperitoneal injection of cyclophosphamide were inoculated cutaneously into the flank with the virus and developed severe zosteriform skin lesions. All of them died within 2 weeks after the infection, while most of the normal mice survived the viral infection with healing of the lesions. In the gastrointestinal tract of the immunosuppressed mice, macroscopic abnormalities were frequently observed, and infectious viruses were detected on days 7 to 9. The viruses were also detectable in the dorsal root ganglia and the spinal cord of thoracolumbar area on days 5 to 7, and in the celiac plexus on day 7. However, no viruses were detected in the blood. Immunohistological examination of the gastrointestinal tract revealed that the viral antigens were localized in Auerbach's myenteric plexus. These results suggest that HSV-1 inoculated into the flank skin invaded the gastrointestinal tract via the nervous system, which gastrointestinal involvement might possibly have caused the death of the mice.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01379110

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