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  • 1985-1989  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Oxidation behavior of Nd-Fe-B magnets (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3763-3765 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This corrosion study was performed to determine the reaction kinetics of Nd-Fe-B type magnets in oxidizing environments. Thus the oxidation model developed provides basic information for the development of oxidation-resistant magnets. The oxidation of Nd-Fe-B magnets was studied at temperatures between 20 and 150 °C. The oxidation rates of the magnets were measured as functions of humidity in air, temperature, and alloy composition. Aerated salt and distilled water, at room temperature, were used as accelerating environments. The morphology of the reaction products was analyzed with scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDX) and used to aid the interpretation of the reaction kinetics. The kinetics for the oxidation of magnets generally exhibit a parabolic weight increase in humid air at room temperature. Minor alloying additions affect the corrosion rate. In aerated distilled water, Nd-Fe-B magnets generally exhibit a linear weight loss. The magnets in aerated salt water show an inverse parabolic weight loss. Magnetization of the magnets substantially reduced the oxidation rate in the salt water test. The oxidation mechanism will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338635
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Acceptance of Hepatitis B Vaccine Among Dental Health Care Workers (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of public health dentistry 49 (1989), S. 0 
    Details
    ISSN: 1752-7325
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Participation in hepatitis B vaccination programs by dental health care workers (DHCWs) has been low. Following a vaccination program at the University of Michigan School of Dentistry, a survey was conducted to determine the relation of sociodemographic status, health beliefs, amount of patient contact, and perceived barriers to participation or nonparticipation in the program by 618 students, faculty, and staff. Stepwise logistic regression revealed that a respondent's age, perceptions about susceptibility to hepatitis B, amount of patient contact, and perceptions about the cost of the vaccine were significant determinants of participation. Findings from this study suggest that a highly structured program format is necessary to lower barriers and facilitate access to vaccination, while also cueing the DHCW to appropriate preventive behavior. Knowledge appears to be but one factor that may affect decisions regarding acceptance of hepatitis B vaccine; health beliefs, motivational factors, barriers, and program organization all have a significant impact on the DHCWs decision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-7325.1989.tb02028.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in foliar elements in red spruce seedlings after exposure to sulfuric and nitric acid mist (1989)
    Springer
    Water, air & soil pollution 48 (1989), S. 141-159 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Red spruce (Picea rubens Sarg.) seedlings were exposed repeatedly at a field site or in a greenhouse to acidic mist containing the major sulfur and nitrogen pollutants of wet deposition in the eastern U.S.: sulfate alone, nitrate alone or with ammonium ion, and a combination of these ions. Acidities and ion concentrations ranged from below the mean to above the maximum concentration for cloudwater in the eastern U.S. Effects on elements in current-year foliage were examined after continuous or intermittent overnight exposures to mist performed over periods of 6 to 19 weeks. Principal findings from five experiments conducted over a three-year period were that acidic mist 1) increased the foliar S and/or N content when exposures were intermittent with repeated opportunities for drying of liquid on foliage; 2) decreased foliar calcium, and/or magnesium content, especially when exposures to acidic mist were continuous rather than intermittent; and 3) gave inconsistent results for foliar iron and aluminum probably because of deposition of soil particles and contamination with metals from the mist delivery system. These results indicate that long-duration exposures to cloudwater with pH below 3 may alter foliar nutrient composition and change relationships between N, S, Ca, and Mg, with potential consequences for growth and resistance to natural stress factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282375
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    Paper (German National Licenses)
    Fulltext
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