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  • 1995-1999  (8)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The magnetoresistance and microstructure of Fe–xCr–10Co alloy thin films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8593-8597 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large negative magnetoresistance (MR) is observed in Fe–xCr–10Co (x=10,20,30,40,50,- 60,70, and 80 wt %) ternary heterogeneous alloy films prepared by the IBS (ion beam sputter) deposition process. All the as-deposited films consisted of the α phase alone. After aging treatment, the α phase is decomposited into two phases: the α1 (Fe–Co rich phase) and α2 (Cr rich phase). In the granular alloy, the GMR effect is obtained by virtue of the interface scattering between α1 and α2. After isothermal aging at 400 °C for 1 h, the largest MR of −27% appears around the Cr content of 60 wt % at 77 K and 14 kOe. The MR ratio of Fe–50Cr–10Co and Fe–70Cr–10Co is −12% and −20%, respectively, at the same condition. The MR ratio is also obviously effected by the Cr (or Fe) content in the alloy system. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362455
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Possible use of direct silicon-on-silicon bonding for construction of analyzers for inelastic scattering : The 9th National conference on synchrotron radiation instrumentation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3366-3366 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Bonding of silicon directly to silicon is possible with proper preparation of the two surfaces to be bonded. The advantage of such a method is that a bonding agent is not required, and direct bonding avoids figure errors introduced by thickness variations in a bonding agent. We have succeeded in bonding a 3-inch-diameter diced (1 mm × 1 mm) silicon(111) oriented wafer to a silicon concave spherical form having a 3-m radius. A very good rms figure error of 0.059 millirad over the entire area of the analyzer was measured. The suitability for x-ray inelastic scattering due to introduced strain is, however, still an open question. Whether or not deleterious strain is unavoidably introduced during the bonding process is a question we will answer with availability of photons on sector 3 of the SRI CAT at the Advanced Photon Source. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146928
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of heat treatment and Co on the giant magnetoresistance of Fe-60 Cr–XCo alloy thin films (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 317-321 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article presents the giant magnetoresistance (GMR) effect and microstructure of Fe-60Cr-XCo ternary heterogeneous alloy films. After ion beam sputtering, the films are heat treated at a temperature within the miscibility gap. The separated phases and lattice images of the α1 (Fe–Co rich phase) and α2 (Cr rich phase) are further determined by high resolution transmission electron microscopy. In the granular alloy, the GMR effect is obtained by the interface scattering between the phases of α1 and α2. By isothermal aging at 550 °C for 80 min, the largest MR ratio of −62% appears for the film with the composition of Fe-60Cr-15Co at 77 K under a field of 14 kOe. For the same treatment, the MR ratios of Fe-60Cr-10Co and Fe-60Cr-20Co are −39% and −43%, respectively. The Co content and heat treatment condition in the alloy system obviously affect the MR ratio. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365814
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  • 4
    Electronic Resource
    Electronic Resource
    Giant magnetoresistance and phase decomposition of Fe–XCr–Co (WFe/WCo=1) thin film granular alloys (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4523-4527 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this study, the giant magnetoresistance (MR) effect was observed in Fe–XCr–Co (WFe/WCo=1, X=27, 40, 50, 60, 70, and 80 wt %) ternary heterogeneous alloy films. After aging, the separated phases and lattice images of the α1 (Fe–Co rich phase) and α2 (Cr rich phase) were further determined by high resolution transmission electron microscope. Experimental results indicate that the MR variations in Fe–Cr–Co thin films alloys were associated with the heterogeneous microstructure. By isothermal aging at 550 °C for 80 min, the largest MR of −43% appears for the film with the composition of 40(Fe/Co)–60Cr at 77 K under a field of 14 kOe. At the same treatment condition, the MR ratios of 50(Fe/Co)–50Cr and 30(Fe/Co)–70Cr are −13.2% and −21.3%, respectively. Cr content, therefore, significantly affected the MR ratio. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363557
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  • 5
    Electronic Resource
    Electronic Resource
    Imaging-Guided Core Biopsy of the Breast (1995)
    Oxford, UK : Blackwell Publishing Ltd
    The @breast journal 1 (1995), S. 0 
    Details
    ISSN: 1524-4741
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: This article reports on our experience with core needle biopsy (CNB) of the breast and presents a review of the literature. We have performed CNB on 304 women with abnormalities classified on imaging as highly suggestive of malignancy (52 cases), suspicious (245 cases) or probably benign (7 cases). The CNB procedure was performed using either stereotactic mammographic guidance (251 cases) or ultrasound guidance (53 cases) with a 14-gauge needle. At least five specimens were obtained for each abnormality. The sensitivity of core biopsy was 98% and the specificity was 99%. There were three false negatives and one false positive. An excisional biopsy was recommended in 17 cases in which the CNB diagnosis was not definitive, including 12 with atypical ductal hyperplasia (ADH), 4 with discordance between imaging and histologic results, and 1 with inconclusive histology. Our results are consistent with other reports in the literature using 14-gauge core needle biopsy. In our practice, core biopsy has proven to be an effective method for the evaluation of imaging findings that are suspicious or highly suggestive of malignancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1524-4741.1995.tb00213.x
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  • 6
    Electronic Resource
    Electronic Resource
    Novel surface acoustic wave-interdigitated array electrode gas sensor for dissolved ammonia (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 379-383 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  A novel surface acoustic wave-interdigitated array electrode (SAW-IDA) ammonia gas sensor is proposed. A gas-permeable membrane is employed to separate the buffer solution in the inner cell of the gas-sensing probe from the sample solution in the detection cell. The response of the IDA conductive electrodes is based on the impedance change of the buffer solution during ammonia adsorption. Therefore, this gas sensor overcomes the influence of water vapour in the conventional film-coated SAW gas sensor and can be used for the detection of gases in aqueous solutions. The ammonia sensor exhibits a favourable frequency response to 5×10-7–1×10-3 mol/l ammonia. The optimal buffer composition and probe parameters have been determined. Dynamic range, response time, selectivity, and temperature drift are discussed. The ammonia sensor was also applied to the determination of serum ammonia. Results were in good agreement with those from the conventional enzymatic-spectrophotometric method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050173
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  • 7
    Electronic Resource
    Electronic Resource
    Flow-injection analysis based on a membrane separation module and a bulk acoustic wave impedance sensor – determination of the volatile acidity of fermentation products (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 272-274 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel flow-injection analysis (FIA) system has been developed for the rapid determination of the volatile acidity of some fermentation products like vinegars and juices. The proposed method is based on the diffusion of volatile acids, mainly acetic acid, across a PTFE gas-permeable membrane from an acid stream into an alkaline stream, and the acids trapped in the acceptor solution are determined online by a bulk acoustic wave impedance sensor based on changes in the conductivity of the solution. It exhibited a linear frequency response up to 10 mmol · L–1 acetic acid with a detection limit of 50 μmol · L–1, and the precision was better than 1% (RSD) at a through-put of 72 h–1. The effects of operating voltage for the detector, cell constant of the electrode, composition of acceptor stream, flow rates and temperature on the FIA performance were also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050690
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetic assay of antitrypsin in human serum by a surface acoustic wave(SAW)-impedance sensor (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 356 (1996), S. 96-97 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Antitrypsin in human serum was determined by using both the SAW-impedance sensor system and spectrophotometry, indicating that the mean value for women was significantly higher than the mean value for men; the value for acute pancreasis patients is about 2-folds of the normal values, and there is no significant difference between the acute pancreasis patients and the pancreatic cancer patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663560096
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