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  • 1
    Electronic Resource
    Electronic Resource
    Interactions of Organic Additives with Boric Oxide in Aqueous Barium Titanate Suspensions (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: The interactions between added boric oxide (B2O3) and organic additives, and their effects on the colloidal stability of aqueous BaTiO3 suspensions have been investigated. The initially Newtonian or pseudoplastic aqueous BaTiO3 suspension with poly(vinyl alcohol) (PVA) becomes dilatant, and its viscosity also increases dramatically when a critical amount of B2O3, 0.4 wt%, is added. This has been attributed to a chemical reaction between the dissociated borate ion (B(OH)4−) and PVA, which form a gel-type structure in the aqueous BaTiO3 suspension. The dilatancy and viscosity of the aqueous BaTiO3 suspension with PVA and B2O3 increase significantly when a dispersant of ammonium salt of poly(acrylic acid) (PAA-NH4) is present. The ionization of B2O3 is enhanced by the basicity of dissociated PAA−, promoting the formation of PVA-B(OH)4− gel-type structure in the aqueous BaTiO3 suspensions. With added plasticizer of 1,2- (e.g., ethylene glycol (EG)) or 1,3-diol (e.g., 1,3-propanediol (PPDL)) molecular structure, both the dilatancy and viscosity of aqueous BaTiO3 suspensions with PVA, B2O3, and PAA-NH4 decrease dramatically. Stable compounds of diol-B(OH)4− are formed before the dissociated B(OH)4− reacts with PVA, reducing the degree of gelation of aqueous BaTiO3 suspensions. A stability map is constructed to describe the amount of EG required to obtain colloidally stable aqueous BaTiO3 powder suspensions with PVA, PAA-NH4, and B2O3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00294.x
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  • 2
    Electronic Resource
    Electronic Resource
    Theory of potential-step transmission chronoabsorptometry (1973)
    s.l. : American Chemical Society
    Analytical chemistry 45 (1973), S. 2370-2380 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60336a004
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  • 3
    Electronic Resource
    Electronic Resource
    Dissolution and Dispersion Behavior of Barium Carbonate in Aqueous Suspensions (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: Dissolution of BaCO3 and its effect on the dispersion behavior of aqueous BaCO3 suspensions at various pH values have been investigated. The amount of leached Ba2+ decreases with increasing pH value, which agrees with thermodynamically calculated results. The dissolution of BaCO3 also causes an increase in pH value of the suspension, but the change decreases with increasing initial pH value. The isoelectric point (IEP) of leached BaCO3 powder is at a pH of ∼10–10.5 and remains unchanged with increasing solids loading. The IEP of BaCO3 shows no significant change with added KCl or K2CO3, but shifts to a higher pH with increasing concentration of added BaCl2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00566.x
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  • 4
    Electronic Resource
    Electronic Resource
    Interaction between Dissolved Ba2+ and PAA-NH4 Dispersant in Aqueous Barium Titanate Suspensions (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: The interaction between dissolved Ba2+ and dissociated ammonium salt of poly(acrylic acid) (PAA-NH4) in aqueous suspension has been studied. The dissolved Ba2+ causes flocculation of dissociated PAA-NH4, thus degrading its dispersing effectiveness in aqueous BaTiO3 suspensions. The concentration of PAA-NH4 required to stabilize aqueous BaTiO3 suspension increases with increasing Ba2+ concentration at a given pH. A stability map, which is determined by a rheological study, is constructed to describe the amount of PAA-NH4 required to have well-dispersed aqueous BaTiO3 suspensions as a function of Ba2+ concentrations at different pH values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00295.x
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  • 5
    Electronic Resource
    Electronic Resource
    A New Method of Fabricating the Anode Powder for the Application of Solid Oxide Fuel Cells (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 51 (June 2008), p. 79-84 
    Details
    ISSN: 1662-8985
    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: This paper presents the development of anode substrates of solid oxide fuel cells(SOFCs), prepared by rotating electrode powder-making equipment to improve the efficiency ofcells and the coking issue that appears in traditional Ni-YSZ composite anodes when operated withhydrocarbon fuel.Combining the advantage of good electronic conductivity, leading less carbon residue of copperand high temperature oxidation resistance of Cr or Ni, the anode substrate is designed with Cu-Niand Cu-Cr alloys so that the cells are able to work within the service temperature of 800-1000 C.To optimize the properties of conductivity, less carbon deposition and heat resistance, thisresearch has invented substrates of copper-based dual metal composite alloys which are differentfrom ordinary anode cermet powder made of nickel-ceramic composites. This new anode powder ofdual metal alloys is made by rotating electrode powder-making equipment, with the powders beingsintered to porous substrates. Experimental results show that the substrate has a good porosity andan electrical conductivity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.51.79.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    A strategic contingency model for technology alliance (2005)
    Bingley : Emerald
    Industrial management & data systems 105 (2005), S. 623-644 
    Details
    ISSN: 0263-5577
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science , Economics
    Notes: Purpose - Based on theories of organizational learning and strategic considerations, this study aims to develop a strategic contingency model for technology alliance and identify how alliance-specific factors, strategic factors, and organizational capability factors influence firms to acquire competencies and competitive advantages through technology alliance. Design/methodology/approach - A six-page, 94-item survey questionnaire was developed and mailed to top-level managers of the semiconductor firms in Taiwan. A total of 63 valid responses were received. Findings - The study results indicate that firms with higher absorption orientation, higher risk reduction orientation, higher R&D scale economy orientation, and higher top management team experiences tend to perform better in acquiring competitive advantages. In addition, the strategic fit between strategic factors, organizational capability factors and technology alliance choice could lead firms to better competitive advantage. Research limitations/implications - Although the results of this study are fruitful, several suggestions could be made for academicians and business practitioners. First, the respondent rate of this study is low and could be improved. Second, in addition to the strategic contingency model as developed in this study, more research factors could be further investigated. Third, more case studies could be conducted to reconfirm the results of this study. Originality/value - The major contribution of this study is to investigate what critical factors would influence the choice of a technology alliance model, and what effects the influencing factors have on the relationship between a technology alliance model and the intended competency development. The results of this study provide very important references for academicians and practitioners to investigate the effectiveness of technology alliance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02635570510599995
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  • 7
    Electronic Resource
    Electronic Resource
    An early Cambrian craniate-like chordate (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 402 (1999), S. 518-522 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Since the identification of the Lower Cambrian Yunnanozoon as a chordate in 1995 (ref. 1), large numbers of complete specimens of soft-bodied chordates from the Lower Cambrian Maotianshan Shale in central Yunnan (southern China) have been recovered. Here we describe a recently ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/990080
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  • 8
    Electronic Resource
    Electronic Resource
    The Alloy Design of Metallic Interconnector of Solid Oxide Electrolyte Fuel Cell (SOFC) (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1617-1620 
    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: This study is intended to reduce the difference of thermal expansion coefficient betweenmetallic interconnector and solid electrolyte of SOFC (Solid Oxide Fuel Cell) without sacrificing ofelectrical conductivity.Fe-Cr alloys have been chosen as candidate materials due to its merit of low cost and hightemperature oxidation resistance. Different amount of alloys element and compositions have beenvaried to optimize the properties by method of alloys design with aid of thermodynamics softwareThermal-Cal. Phase diagrams of multi-components alloys have been drawn to predict the possiblestable phases formed in the investigated metals. An arc melter and plasma melting furnace wereused to melt the investigated alloys. The measurements of thermal expansion coefficients andelectrical conductivities are carried out with TMA and ASR resistance instrument. The resultsindicate that the Fe-10Cr alloy exhibits the smallest thermal expansion coefficient among the alloys,while Fe-16Cr has a lowest electrical resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1617.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Control of particle size distribution of CdS quantum dots in gel matrix (1994)
    Springer
    Journal of sol gel science and technology 1 (1994), S. 123-132 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; CdS crystallites ; NLO materials ; quantum dots ; particle size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel sol-gel process has been developed to prepare nano-sized CdS quantum dots to improve the nonlinear optical properties. A bifunctional ligand, 3-aminopropyl triethoxysilane H2N(CH2)3Si(OC2H5)3, was used to disperse the Cd2+ ions in the gel solution. The CdO and CdS particles were observed by transmission electron microscope (TEM). The size of CdS microcrystallites with concentrations up to 13 wt.% in SiO2 gel matrix was found to be in the range of 2–4 nm with a very sharp size distribution. A well-defined absorption edge was observed in the absorption spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00490242
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on the biochemistry and fine structure of silica shell formation in diatoms (1985)
    Springer
    Protoplasma 124 (1985), S. 10-29 
    Details
    ISSN: 1615-6102
    Keywords: Cell wall morphogenesis ; Labiate process ; Patterning ; Silica deposition ; Ditylum brightwellii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The sequential wall formation in the centric diatom,Ditylum brightwellii (West) Grunow, is described. The silica deposition vesicle is formed by the coalescence of small vesicles. Silicification of the new valve starts from the central labiate process area prior to the completion of cytokinesis, and the developing valve grows in a centrifugal direction. The initiation of the structures on the valve follows the sequence: labiate process, marginal ridge, and rota. A novel “labiate process apparatus”, which is situated in the cytoplasm close to the developing labiate process, appears prior to the initiation of the labiate process and disappears upon its maturation. Segments of the girdle bands are formed in individual silica deposition vesicles after the valve matures and is exocytosed. Three morphological forms of deposited silica have been determined: thin base layers, microfibrils, and hexagonal columns. The involvement of cytoplasmic structures in the patterning of the siliceous wall is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279720
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