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  • 1995-1999  (7)
  • 1970-1974  (4)
  • 1
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2135-2137 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Free-space micro-optical systems on a chip containing three-dimensional microgratings have been demonstrated using surface-micromachining technique. The micrograting is integrated with a rotary stage, a collimating micro-Fresnel lens, and an edge-emitting laser held by three-dimensional alignment structures on a single Si substrate. Diffraction patterns for various grating rotation angles are observed. Another optical interconnect module consisting of three cascaded microgratings is also demonstrated. The micrograting is a basic building block for many micro-optical systems and is very attractive for applications in microspectrometers, free-space optical interconnect, optoelectronic packaging, and wavelength-division multiplexed integrated micro-optical systems. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2946-2948 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Novel self-aligned hybrid integration of semiconductor lasers with three-dimensional micro-optical components has been demonstrated. The self-alignment structures are fabricated integrally with other three-dimensional micro-optical elements such as micro-Fresnel lenses, mirrors, and gratings on a single Si chip by surface micromachining technology. The Si substrate serves as a free-space micro-optical bench for active and passive optoelectronic components. A divergent beam emitted from an edge-emitting semiconductor laser has been successfully collimated by the integrated micro-Fresnel lens. The integration scheme offers a new approach for optoelectronic packaging and a new technology platform for integrating complete free-space micro-optical system on a single chip. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2162-2164 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Exchange biasing field Hex and coercive field Hc of the exchange-biased NiO spin valves deposited over differently etched glass substrates and glass Si3N4 buffer layers were measured in order to investigate the effect of roughness at the NiO/NiFe interfaces. The magnetoresistive (MR) ratio, Hex, and Hc were not influenced by etching time, even though the rms roughness Rrms increased from 4.7 to 33 Å. However, the MR ratio, Hex, and Hc increased with Si3N4 buffer thickness, even when the Rrms had almost the same values. To explain this ambiguous dependence of Rrms, we consider an effect of the average slope of roughness instead of Rrms in an atomic force microscope image. The steep slope of roughness played an important role in Hex and Hc in NiO spin valves due to an increase in magnetostatic energy and the decrease in antiferromagnetic domain size. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Carfax Publishing Limited
    Addiction 93 (1998), S. 0 
    ISSN: 1360-0443
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: Aims. To analyse the temporal changes in demography and drug-taking behaviours of a cohort of drug users in Hong Kong . Design. An analysis of records of clients over a 5-year period . Setting. Shek Kwu Chau Treatment and Rehabilitation Centre, a large residential service offering voluntary rehabilitation programmes for male drug users in Hong Kong . Measurements. The following parameters were analysed for all admissions between 1991 and 1995: duration of drug-taking, route(s) of drug administration, type of drugs abused, practice of injection and needle-sharing, time since last needle-sharing, and expenditure on drugs . Findings. A total of 10 353 admissions were recorded in the 5-year period from 1991 to 1995, of whom 2853 (27.6%) were new admissions. The mean age was 36 years. There was a significant increase in new admission in those between the age of 13 and 19. Almost all clients were heroin users. The needle-sharing rates fell from over 20% in 1991 to 5% in 1995. Needle-sharing was more common in younger clients. The decline in the rate of needle-sharing was especially significant in those between the age of 20 and 39 . Conclusion. The proportion of young drug users in the study population in Hong Kong has risen over the 5-year period. The prevalence of high-risk drug-taking behaviours had declined, which might have contributed to the low HIV rates in the community.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 13 (1973), S. 0 
    ISSN: 1365-3180
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Journal of intelligent manufacturing 7 (1996), S. 379-386 
    ISSN: 1572-8145
    Schlagwort(e): Neural simulation ; keyboards ; SIMAN ; assembly ; control
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: This paper describes the integration of a feedforward neural network with a real-time adaptive control technique to model an assembly cell for computer keyboards. The simulation model is able to undertake real-time forecasting of the expected behaviour of the cell, and also able to display in real time the current status of the assembly cell. The potential of integrating artificial neural networks into simulation together with an on-line real-time interface between the simulation model and the real-world system is investigated in this study. A simulation model was built in SIMAN with a neural network written in NeuralWork Professional II Plus embedded in the model to allow training and testing of the network. The control of the cell was achieved through a third-party program written in C that interfaces directly to the cell.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 26 (1970), S. 82-83 
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Zusammenfassung Nachweis der Absorption von Aflatoxin B1 durch die Rattenhaut. Die toxische Leberwirkung nach der Hautbepinselung entsprach den von anderen Autoren gefundenen Verhältnissen bei peroraler oder intraperitonealer Verabreichung.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 27 (1971), S. 458-460 
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Zusammenfassung In vitro Experimente mit14C-markiertem, gereinigtem Aflatoxin zur Untersuchung der Bindung von Aflatoxin B1 und G1 an verschiedene Serumproteine ergaben, dass Aflatoxin B1 hauptsächlich mitγ-Globulin, G1 dagegen vorwiegend mit Albumin bindet.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Marine biology 5 (1970), S. 83-88 
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The muscle myogen patterns of some penaeid prawns studied by electrophoresis in cellulose acetate membrane are presented. Each pattern was species specific and appears to be independent of sex. The results suggest that muscle myogen patterns could be useful in taxonomic studies of penaeid prawns. Specimens preserved in phenoxyethanol were compared with fresh specimens. Preservation resulted in some losses of protein zones and, in cases where sufficient zones are preserved, the method could be used to advantage for solving taxonomic problems.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    International orthopaedics 20 (1997), S. 373-377 
    ISSN: 1432-5195
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé. Entre Juin 1991 et Mai 1994, 11 patients souffrant d’une infection chronique persistante de la hanche ont pu être traités avec succès à l’aide d’une transposition du vaste externe. La durée moyenne d’infection était de 7,9 mois. Les patients avaient subi, en moyenne 2,8 tentatives chirurgicales d’éradication de l’infection avant que ne soit pratiquée la transposition musculaire. Trois patients ont eu une récidive de fistule traitée avec succès par antibiotiques et débridement local. Chez 2 patients, a été fait un remplacement prothétique dans un temps chirurgical ultérieur. Au dernier examen, chez tous les patients, la cicatrisation était obtenue et les problèmes d’infection résolus. Les avantages de la technique utilisée sont les suivants: l’intégrité du muscle est en générale respectée par les opérations précédentes et il possède un pédicule vasculaire permettant un large arc de rotation; il peut faire office de tampon entre l’acétabulum et le fémur voisin et d’attache pour prévenir une migration proximale extrême du fémur. Enfin, la fonction d’extension du genou semble n’être en rien entravée. Dans le traitement d’une infection chronique persistante de la hanche, l’utilisation de ce type de transposition non seulement peut servir de procédé d’appoint à l’arthroplastie de Girdlestone mais peut faire également office de temps intermédiaire avant une arthroplastie totale ultérieure.
    Notizen: Summary. Between January 1991 and May 1994, 11 patients with chronic recalcitrant infection of the hip joint were successfully treated by transposition of a vastus lateralis flap. The average duration of the infection was 7.9 months. The patients had undergone an average of 2.8 procedures in an attempt to eradicate the infection before transposition of the flap. Three patients had recurrence of drainage after the procedure and were successfully treated with antibiotics and local debridement. Delayed exchange total hip arthroplasty was performed in 2 patients. All the patients achieved wound healing and infection resolution. This flap has several advantages. The donor site has not usually been scarred from previous operations; the flap has a consistent vascular pedicle which permits a wide arc of rotation; knee extension is unaffected; the transposed portion of the vastus lateralis can act as a cushion between the acetabulum and the proximal femur; it may also act as a tether to prevent extreme proximal migration of the femur. In the management of chronic recalcitrant infection of the hip, use of a transposition flap can be combined with a Girdlestone arthroplasty. It can also be an interim procedure before a further total joint arthroplasty.
    Materialart: Digitale Medien
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