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  • 1990-1994  (21)
  • 1980-1984  (12)
  • 1935-1939  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The properties of Y1Ba2Cu3O7−δ thin films with silver doping prepared by spray pyrolysis (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 6946-6952 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting, silver-doped films of Y1Ba2Cu3O7−δ have been deposited by spray pyrolysis of aqueous nitrate solutions onto MgO substrates. The superconducting transport properties, microstructure, and microwave losses have been characterized for various amounts of AgNO3 added to the spraying solution. These films had resistive transition temperatures between 79 and 85 K with widths from 3 to 7 K. The room-temperature resistivity was a strong function of the silver doping, dropping by a factor of 50 for the heavily doped films. Critical current densities at 4 K were typically several 103 A/cm2 with little correlation to the silver doping. Lattice constants also were not significantly affected by the silver doping level, however, lightly doped films were denser, had the strongest c axis preferred orientation, and a smoother surface. Rf surface resistance was measured at 18 GHz, and for the best films dropped a factor of 10 below copper by 40 K. The London penetration depth was estimated to be approximately 1 μm for the best films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345038
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  • 2
    Electronic Resource
    Electronic Resource
    Light detection using high-Tc microstrip transmission lines as a probe of film homogeneity (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4995-4999 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the effects of light on high-temperature superconductor microstrip transmission lines under conditions for which a bolometric photoresponse is expected. We illustrate the pitfall of comparing a spatially local property (such as microwave detected photoresponse) and a global property (such as microwave transmission), and then drawing conclusions regarding the bolometric character of the photoresponse. For low microwave powers, the photoresponse, measured as function of the position of the spot illuminated, provides a measurement of the spatial inhomogeneity of the microwave properties of the film. For microwave powers large enough to depress the critical temperature, such measurements provide information about standing waves in the microstrip.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349002
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  • 3
    Electronic Resource
    Electronic Resource
    Proton radiation effects in microwave cavities and ring resonators fabricated from YBa2Cu3O7−δ (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1563-1565 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first radiation effects study on a superconducting ring resonator made from thin-film YBa2Cu3O7−δ. Exposure to 2 MeV protons causes the superconducting transition temperature Tc to decrease predictably with fluence. For temperatures below about 0.9Tc , there is no significant change in the transmission coefficient, the center frequency, or the quality factor Q of the resonator, even for doses in excess of 4×1016 protons/cm2 (∼0.04 displacements per film atom). Similarly, the low-temperature surface resistance Rs of an unpatterned film does not change with irradiation. We show that this insensitivity to radiation is not predicted by standard theory, and that the dominant part of Rs at low temperature is the residual resistance R0. Thus any viable theory describing the origin of R0 must, as a criterion, explain the origin of its insensitivity to large irradiation doses. This criterion is used to evaluate theories ascribing R0 to weak links, flux pinning, impurities, and lattice imperfections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105178
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  • 4
    Electronic Resource
    Electronic Resource
    Metalorganic chemical vapor deposition of double-sided YBa2Cu3O7 thin films (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1682-1684 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of YBa2Cu3O7−δ were deposited on both sides of (100) LaAlO3 substrates by metalorganic chemical vapor deposition. Using a gold-coated wafer carrier, improvements in both the transition temperature and critical current density of the film exposed to the carrier (first side) were demonstrated. Tc's of 86–88 K and Jc's≥106 A/cm2 at 77 K were achieved. The microwave surface resistance of both sides of double-sided samples measured at 77 K was approximately 8 mΩ at 36 GHz, scaling to less than 700 μΩ at 10 GHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109575
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  • 5
    Electronic Resource
    Electronic Resource
    Metalorganic chemical vapor deposition of low microwave surface resistance YBa2Cu3O7 on (100) LaAlO3 and (100) SrTiO3 (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2926-2928 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of YBa2Cu3O7−δ on (100) LaAlO3 and (100) SrTiO3, up to 5000 A(ring) thick, were grown by metalorganic chemical vapor deposition. The as-deposited films were c-axis oriented, and had transition temperatures between 87 and 89 K, transition widths less than or equal to 1 K, and critical current densities of 1–3×106 A/cm2 at 77 K. Microwave surface resistance measurements at 36 GHz on (100) LaAlO3 showed significant improvements over copper metal at 77 K. Films grown on (100) SrTiO3 exhibited slightly better properties than those grown on (100) LaAlO3. Films which were slightly deficient in barium and rich in yttrium consistently demonstrated superior properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106822
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  • 6
    Electronic Resource
    Electronic Resource
    Crystal Calorimeters in Particle Physics (1994)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 44 (1994), S. 453-500 
    Details
    ISSN: 0163-8998
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ns.44.120194.002321
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  • 7
    Electronic Resource
    Electronic Resource
    Assessment of pain in cervical dentinal sensitivity studies (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 20 (1993), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Traditionally cervical dentinal sensitivity (CDS) has been evaluated mainly subjectively on the basis of the individual patient's subjective response, e.g., in the form of verbal rating and visual analogue scales and questionnaires. The stimuli used for evaluating this response can be grouped into 4 main categories: mechanical, chemical, electrical and thermal. This review of the literature, however, indicates that there are problems in evaluating patient subjective response to these various test stimuli used in the assessment and treatment of CDS. Opinions also vary as to the reliability of some of these methods of assessment, although recently, efforts have been made to develop controlled reproducible stimuli more suited to the evaluation of CDS. Currently no single method of eliciting and assessing CDS may be considered ideal. Further research is required to evaluate suitable methodology for the quantification of realistic test stimuli under controlled clinical conditions, whereby the subjective response may be objectively measured by the investigator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-051X.1993.tb00378.x
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  • 8
    Electronic Resource
    Electronic Resource
    Stannous fluoride and subgingival chlorhexidine irrigation in the control of plaque and chronic periodontitis (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 10 (1983), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. The purpose of this study was to investigate the possible benefits of stannous fluoride dentifrice (SnF2) and once daily chlorhexidine (CH) in the control of chronic periodontitis, following a single course of scaling and root planing. 14 adult patients with pockets 4 mm or deeper received a thorough scaling and root planing, followed by instruction in the irrigation of those pockets with CH. They were given either SnF2:-containing or a placebo dentifrice, and a new multituft toothbrush, but no instruction in routine oral hygiene.Plaque Index (PII), Sulcus Bleeding Index (SBI) and pocket depth were recorded prior to scaling on day 0. The same parameters and gingival shrinkage were recorded at weeks .1, 2, 4, 8 and 12. CH irrigation was discontinued at day 28.Both groups showed highly significant improvements in all parameters except gingival shrinkage after 28 days. PII was significantly less at all stages in the SnF2 group. It reached baseline values by day 56 in the placebo and day 84 in the SnF2 group. Periodontitis as assessed by SBI remained reduced significantly below baseline values in both groups at the end of the study. At this time there was no significant difference between the groups as regards SBI.It was concluded that a single course of thorough scaling and root planing followed by once daily subgingival irrigation with CH for 1 month, produced a reduction in periodontitis still apparent 2 months after cessation of irrigation. This regime allows a 3-month interval between oral hygiene visits. SnF2-containing dentifrice had a plaque control effect additional to that produced by the regime but had no effect on periodontitis as assessed by SBI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-051X.1983.tb02205.x
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  • 9
    Electronic Resource
    Electronic Resource
    Plaque-host imbalance in severe periodontitis (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 10 (1983), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. One child and one adult with severe periodontitis were investigated for relevant systemic factors and predominant periodontal pocket bacteria. The child had a chronic neutropenia, the adult late yaws, a chronic iron deficiency and possibly rheumatoid arthritis. The predominant organisms in both pocket floras were gram-negative cocci showing occasional filament formation and resembling strains of Bacteroides asaccharolylicus and possibly Actinobacillus actinomyceiemcomitcins described by others. There were indications that the flora was determined by the host response rather than vice versa and that thorough systemic investigation may aid the efficient diagnosis and treatment of patients with severe periodontitis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-051X.1983.tb02202.x
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental use of a slow release device employing chlorhexidine gluconate in areas of acute periodontal inflammation (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 9 (1982), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Eleven patients suffering acute exacerbations of chronic periodontitis were treated by the insertion into affected periodontal pockets of dialysis tubing containing 20% chlorhexidine gluconate. After 7 days, 9 of the 11 patients exhibited greatly reduced crevicular fluid flow, relief of discomfort and the cessation of bleeding on probing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-051X.1982.tb01228.x
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