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  • 1
    Electronic Resource
    Electronic Resource
    Evaporation of Silver during Cofiring with Barium Titanate (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Silver and Ag-Pd alloy are cofired with BaTiO3-based dielectrics during the manufacturing of capacitors. The diffusion of silver into BaTiO3 during sintering is very slow. However, the vapor pressure of silver is high at temperatures greater than the melting point of silver (960°C). The effect of the evaporation of silver during the sintering with BaTiO3 at 1200°, 1250°, and 1290°C is investigated in the present study. The silver vapor can transport through the pore channel of the dielectrics to a distance of a few hundred micrometers. The melting point of Ag-Pd alloy is higher than that of silver; therefore, the transportation of silver vapor from Ag-Pd alloy is hardly observed at temperatures 〉1200°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01451.x
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  • 2
    Electronic Resource
    Electronic Resource
    Evolution of Mullite Texture on Firing Tape-Cast Kaolin Bodies (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Kaolin undergoes a series of phase changes on heating to elevated temperature, proceeding through kaolin, metakaolin, γ-Al2O3 spinel, and mullite. The morphologic evolution of the kaolin–mullite reaction series was investigated in the present study. A highly textured kaolin green body was prepared by a tape-casting technique, and the morphology evolution from kaolin flakes to mullite aciculars on firing from 450° to 1600°C was then monitored using X-ray diffractometry and scanning electron microscopy. Equiaxed mullite nuclei first appeared at 1000°C; the aspect ratio of the mullite grains then increased with increased firing temperature. The mullite aciculars rearranged their orientation in a glassy phase until they impinged on each other. A highly textured mullite specimen was prepared by firing the kaolin tape at a temperature 〉1500°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00232.x
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Silver on the Sintering and Grain-Growth Behavior of Barium Titanate (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Silver and its alloys frequently are used as electrode material for BaTiO3-based dielectrics. In the present study, a small amount of fine silver particles have been intimately mixed with BaTiO3 powder. The sintering and grain-growth behavior of the silver-doped BaTiO3 in air are investigated. The solubility of silver in BaTiO3, as revealed by lattice-parameter measurement, electrical measurement, and electron probe microanalysis, is 〈300 ppm. The densification of BaTiO3 is slowed slightly by the addition of silver inclusions. However, the presence of a small amount (〈0.3 wt%) of silver increases the amount and size of abnormal grains. When the silver content is 〉0.3 wt%, the grain growth of BaTiO3 then is prohibited by the silver inclusions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01671.x
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  • 4
    Electronic Resource
    Electronic Resource
    Replication focus-forming activity 1 and the Werner syndrome gene product (1998)
    [s.l.] : Nature America Inc.
    Nature genetics 19 (1998), S. 375-378 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The initiation of DNA replication involves a minimum of four factors: a specific DNA sequence (origin), an initiator protein which binds to the origin, a helicase that unwinds the origin and a protein that binds single-stranded DNA that stabilizes the unwound origin. In eukaryotic cells, the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1263
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization and Modification of Nanocrystalline Iron Oxide Powders Prepared by an Inert Gas Condensation Technique (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1379-1382 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nanocrystalline iron oxide powders were prepared by an inert gas condensationtechnique under various oxygen partial pressures. The as-prepared nanocrystalline iron oxidepowders were further modified by electroless nickel plating. The as-prepared and modifiednanocrystalline powders were characterized by X-ray diffraction, transmission electron microscopy,and synchrotron X-ray absorption techniques. In addition, magnetic properties of the iron oxidenanoparticles before and after electroless nickel plating were evaluated by vibrating samplemagnetometer. The experimental results show that the as-prepared nanocrystalline iron oxidepowders exhibited a mixture of iron and γ-Fe2O3 phases. TEM observations revealed that oxidationstarted from the surface of the gas-condensed iron nanoparticles. The amount of iron oxideincreased with increasing oxygen partial pressure and was confirmed by synchrotron x-rayabsorption examination. A decrease in saturated magnetization and coercivity of the nanocrystallineiron oxide powders was observed after electroless nickel plating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1379.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Stoichiometric Study of Iron Sulfide Prepared by Mechanochemical Reaction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 2099-2102 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present study, pure elemental powders of Fe and S were mixed to give the desiredcompositions of Fe50S50. A SPEX 8000D high-energy ball mill was used to synthesize iron sulfidepowders under an Ar-filled atmosphere. The prepared powders were examined by conventionalX-ray diffractometry and synchrotron X-ray absorption spectroscopy. The experimental resultsrevealed that mechanochemical reactions occurred during the ball milling process for all thecompositions. The Fe50S50 phase was obtained after ball milling for 20 h. Extended X-rayabsorption fine structure (EXAFS) results revealed that the nearest neighbor bond lengths of theradial distribution function (RDF) for iron decreased when iron sulfides formed. X-ray absorptionnear edge structure (XANES) of S K-edges distinguished better the structural evolution of these ironsulfides
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.2099.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Pseudocapacitive Manganese Oxide Prepared by a Spray Pyrolysis/Electrostatic Deposition Technique (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 1896-1901 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Manganese oxide powders were prepared by spray pyrolysis from manganese acetatesolution with various pyrolysis temperatures and directly collected via high-voltage electrostaticdeposition technique (ESD). The as-prepared powders were coated onto graphite substrates byelectrophoretic deposition technique (EPD). The as-prepared powders and/or coatings wereexamined by X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), cyclicvoltammetry (CV), and etc. XRD data determined the phase of the as-prepared powders asnanocrystalline Mn3O4 phase, manganese hydroxide and residual acetate. In addition, theelectrochemical characteristics of the resulting powder mixtures were examined by cyclicvoltammetry and charge/discharge cycling in electrolyte for redox supercapacitor applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.1896.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of the supervirulent virG gene of the Agrobacterium tumefaciens plasmid pTiBo542 (1991)
    Springer
    Molecular genetics and genomics 230 (1991), S. 302-309 
    Details
    ISSN: 1617-4623
    Keywords: VirG ; Agrobacterium ; vir activation ; Supervirulence ; pTiBo542
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The virG gene of the Agrobacterium tumefaciens Ti plasmid pTiBo542 has previously been reported to elicit stronger vir gene expression than its counterpart in the pTiA6 plasmid, a property we call the “superactivator” phenotype. The DNA sequence of the pTiBo542 virG gene was determined and compared to that of the pTiA6 gene. The DNA sequences of these genes differ at 16 positions: two differences are in the promoter regions, 12 are in the coding regions, and two are in the 3′ untranslated regions. The 3′ end of the pTiA6 virG gene also contains a probable insertion sequence that is not found downstream of the pTiBo542 gene. The base pair differences in the two coding regions result in only two amino acid differences, both in the amino-terminal halves of the proteins. Five hybrid virG genes were constructed and used to activate the expression of a virB::lacZ gene fusion. Differences in the coding regions of these genes accounted for most of the superactivator phenotype, while differences at the promoter and 3′ untranslated regions also contributed. These findings suggest that the properties of these VirG proteins and their quantities are important for vir gene induction, and also suggest a long-term selective pressure for mutations contributing to differences between these two genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290681
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  • 9
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    Factors Affecting Treatment with Life-Saving Interventions, Computed Tomography Scans and Specialist Consultations (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-04-23
    Description: Background: Emergency treatments determined by emergency physicians may affect mortality and patient satisfaction. This paper attempts to examine the impact of patient characteristics, health status, the accredited level of hospitals, and triaged levels on the following emergency treatments: immediate life-saving interventions (LSIs), computed tomography (CT) scans, and specialist consultations (SCs). Methods: A multivariate logistic regression model was employed to analyze the impact of patient characteristics, including sex, age, income and the urbanization degree of the patient’s residence; patient health status, including records of hospitalization and the number of instances of ambulatory care in the previous year; the Charlson Comorbidity Index (CCI) score; the accredited level of hospitals; and the triaged level of emergency treatments. Results: All the patient characteristics were found to impact receiving LSI, CT and SC, except for income. Furthermore, a better health status was associated with a decreased probability of receiving LSI, CT and SC, but the number of instances of ambulatory care was not found to have a significant impact on receiving CT or SC. This study also found no evidence to support impact of CCI on SC. Hospitals with higher accredited levels were associated with a greater chance of patients receiving emergency treatments of LSI, CT and SC. A higher assigned severity (lower triaged level) led to an increased probability of receiving CT and SC. In terms of LSI, patients assigned to level 4 were found to have a lower chance of treatment than those assigned to level 5. Conclusions: This study found that several patient characteristics, patient health status, the accredited level of medical institutions and the triaged level, were associated with a higher likelihood of receiving emergency treatments. This study suggests that the inequality of medical resources among medical institutions with different accredited levels may yield a crowding-out effect.
    Print ISSN: 1661-7827
    Electronic ISSN: 1660-4601
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Molecular Diversity Preservation International
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  • 10
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    Manganese oxide films prepared by sol–gel process for supercapacitor application (2007)
    Elsevier
    Details
    Publication Date: 2007-12-01
    Print ISSN: 0257-8972
    Electronic ISSN: 1879-3347
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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