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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5401-5408 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The cross section of electroluminescent (EL) porous silicon layers (LEPOS) made from n- and p-doped silicon has been investigated by means of micro-Raman and photoluminescence (PL) spectroscopy to find the luminescence active zone in LEPOS. Special care has been taken to avoid the heating of the sample. Additionally an energy dispersive spectroscopy scan over the sample cross section has been performed for n-LEPOS to detect the distribution of oxygen. Since the n samples display much better EL properties than the p samples, the investigations concentrate on the n samples. For n-LEPOS, a layered structure has been found with SiOx/Si at the top followed by a PL active layer. There are two types of samples showing different forms of Raman spectra. Type-I spectra are narrow and shifted by small values as compared with the Raman spectra of bulk silicon. They have a shoulder at about 510 cm−1 only in the PL active layer. Type-II spectra are broad and shifted by about 7–10 cm−1. All the electroluminescent samples show Raman spectra of type I.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 613-615 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the observation of strong luminescence from porous Si grains containing Si nanocrystallites embedded in polymethyl methacrylate disks. In concentrated samples, forward and backscattered photoluminescence spectra were just as strong as in porous Si on Si wafers. This new result indicates that porous Si grains could be embedded in nonconducting polymers and would retain all its inherent characteristics as in porous Si layers on Si wafers.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2700-2702 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fabrication technology and the properties of a light-emitting device including a porous pn junction are presented. We employ the selective formation of different kinds of porous silicon substructures caused by the doping level and the illumination during anodization. The device has a nanoporous light-emitting n layer between a mesoporous p+-doped capping layer and the macroporous n substrate. The pn junction formed in this way has strong rectifying characteristics. It shows bright red-orange light emission under forward bias. Compared to simple metal-porous silicon devices, the structure has an increased quantum efficiency (factor 10–100).
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 26 (1904), S. 414-417 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 26 (1904), S. 417-418 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 26 (1904), S. 758-759 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 21 (1994), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Current recommendations for periodontal health maintenance emphasize toothbrushing, flossing and periodic dental checkups. The purposes of this study were to examine (1) the effects of these practices on periodontal health and (2) the relationships of demographic and socioeconomic variables with these behaviors and with periodontal health. Adults (n= 319) in the Detroit, Michigan tri-county area were asked how frequently they performed the 3 preventive behaviors. Levels of plaque, gingivitis, calculus, and periodontal attachment were then assessed during in-home dental examinations. There were no statistically significant differences in these health measures between those with acceptable and unacceptable brushing behavior. About 20% of the subjects reported acceptable flossing behavior, and these individuals had significantly less plaque and calculus than other participants. Over 3/4 of subjects reported having a dental checkup at least 1 × a year, and these persons were found to have significantly less plaque, gingivitis, and calculus compared to less frequent attenders. Acceptable brushing behavior was not associated with any particular demographic or socio-economic characteristic, while differences in acceptable flossing behavior were found among age groups. Frequencies of yearly dental checkups varied significantly within every demographic and socioeconomic characteristic.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food process engineering 16 (1993), S. 0 
    ISSN: 1745-4530
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The bulk volume shrinkage of canola and wheat were measured for the temperature range of 20–80C and relative humidity range of 15–90%. the volume decreased exponentially with time as seed moisture content was reduced. For canola, an oilseed, shrinkage and moisture reduction were linearly correlated with a shrinkage coefficient of about 1.0. For wheat, a starchy grain, the relationship was also linear but the coefficient was greater than 1.3. the shrinkage coefficients for both wheat and canola did not show a correlation with drying temperature but varied linearly with relative humidity of the drying air.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of public health dentistry 51 (1991), S. 0 
    ISSN: 1752-7325
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study evaluated the effects of three modes of education on dentists' knowledge, attitudes, and use of pit and fissure sealants. A randomly selected group of dentists was invited to participate in a sealant education initiative. During a 12-month period, a total of 662 dentists either (1) attended continuing education courses, (2) received written materials and videotapes by mail, or (3) received only written materials by mail. A comparison group (n=337) received no materials until after the education phase and evaluation had been completed. Pre-and postintervention surveys were used to measure changes in knowledge, attitudes, and sealant use. Response rates to the two surveys were 62 percent and 76 percent, respectively. Preintervention values for knowledge scores, an attitude scale, and sealant use were similar among the four groups. At followup, the three education groups had significantly higher knowledge scores than the comparison group. Attitude values for all but one group were not significantly different, and sealant use by all groups was identical. The numbers of respondents not using sealants declined slightly between surveys in the three education groups while rising slightly in the No-Education Group. Because program outcomes were similar to those of another sealant initiative, it can probably be concluded that continuing education will increase dentists' knowledge about sealants, but have little effect upon their attitudes or their use of the technique. The changes observed in this investigation maybe due to the particular capacity for cognitive and affective change's of participants, characteristics of the technology being promoted, and external forces in the professional environment.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1752-7325
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this research was to identify dentist characteristics and dental office staffing patterns related to delegation of sealant applications. Results from a 1989 ma/led survey were used to characterize Michigan general dentists (N =300) who did or did not delegate sealant applications to auxiliaries and to identify factors associated with delegation. Nearly 50 percent of respondents were applying all sealants themselves. In offices that delegated the procedure, the mean proportion of sealants being applied by dentists was 39.9 percent. Registered dental hygienists were applying 51 percent, while registered dental assistants were applying 6.5 percent. Delegating dentists were more knowledgeable about sealant procedures, held more favorable attitudes, treated more young patients, placed more sealants, and were better informed about the legality of delegation according to the state practice act. Logistic regression analysis found that employing a registered dental hygienist was the most significant factor associated with sealant delegation, followed by employing a registered dental assistant. Findings suggest that dental auxiliaries, and particularly registered dental assistants, are underutilized for applying sealants. Approaches to increasing delegation of sealants may include changing dentists' traditional hiring patterns, highlighting the skills of auxiliaries such as the registered dental hygienist (RDH) and the registered dental assistant (RDA), and increasing awareness of legally allowable procedures that RDHs and RDAs can perform.
    Type of Medium: Electronic Resource
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