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  • Articles  (41)
  • Wiley  (33)
  • Annual Reviews  (6)
  • Frontiers Media  (2)
  • National Academy of Sciences
  • 2015-2019  (24)
  • 1995-1999  (4)
  • 1980-1984  (13)
  • 1955-1959
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (35)
  • Computer Science  (6)
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  • Articles  (41)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Porous Silicates (1995)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 25 (1995), S. 161-192 
    Details
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ms.25.080195.001113
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    Paper (German National Licenses)
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  • 2
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    Kinetic Analysis of Crystallization in Li1.3Al0.3Ti1.7(PO4)3 Glass Ceramics (2016)
    Wiley
    Details
    Publication Date: 2016-06-30
    Description: The crystallization mechanisms for Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) glass ceramics were studied using thermophysical property characterization techniques. Differential scanning calorimetry (DSC) revealed two separate exothermic events that were ascribed to the initial growth and growth to coherency of a dendritic phase. It was found that the commonly used Johnson-Mehl-Avrami is not a suitable kinetic model for this material. Rather, the Sestak-Berggren (SB) autocatalytic kinetic model was used to analyze the DSC data and the activation energy for initial growth (259 kJ/mol) and coherency (272 kJ/mol) was calculated using isoconversional methods. The calculated parameters for the SB model were used to compare experimental and calculated values for heat flow during the crystallization of LATP and good fits were found for both exothermic events.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
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    Microwave Processing for Improved Ionic Conductivity in Li2O–Al2O3–TiO2–P2O5 Glass-Ceramics (2015)
    Wiley
    Details
    Publication Date: 2015-05-09
    Description: Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) was synthesized using a glass-ceramics approach through crystallization in a conventional box furnace and a modified microwave furnace. The microstructure of samples that were microwave processed at 1000°C showed a larger average grain size (0.87 μm) when compared with the grain size of conventionally processed samples (0.30 μm) at the same temperature. Microwave processing led to significant enhancement of the conductivity when compared with conventional processing for all crystallization temperatures investigated. The highest total conductivity achieved was of glass microwave processed at 1000°C, with a conductivity of 5.33 × 10 −4  S/cm. This conductivity was five times higher than that of LATP crystallized conventionally at the same temperature.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
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    Effect of Microwave Processing on the Crystallization and Energy Density of BaO-Na2O-Nb2O5-SiO2-B2O3 Glass-Ceramics (2016)
    Wiley
    Details
    Publication Date: 2016-09-13
    Description: Barium sodium niobate (BNN) glass-ceramics were successfully synthesized through a controlled crystallization method, using both a conventional and a microwave hybrid heating process. The dielectric properties of glass-ceramics devitrified at different temperatures and conditions were measured. It was found that the dielectric constant increased with higher crystallization temperature, from 750°C to 1000°C, and that growth of the crystalline phase above 900°C was essential to enhancing the relative permittivity and overall energy storage properties of the material. The highest energy storage was found for materials crystallized conventionally at 1000°C with a discharge energy density of 0.13 J/cm 3 at a maximum field of 100 kV/cm. Rapid microwave heating was found to not give significant enhancement in dielectric properties, and coarsening of the ferroelectric crystals was found to be critical for higher energy storage.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 5
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    Synthesis and thermal stability of (Co,Ni)O solid solutions (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract (Co,Ni)O solid solutions are considered as promising protective materials of O2‐evolving anodes for Al production. In this context, two solid‐state synthesis methods, namely high‐energy ball milling (HEBM) and calcination, have been evaluated for the synthesis of (Co,Ni)O solid solutions. In all cases, CoxNi1‐xO solid solutions can be formed over the whole composition range. However, undesired WC contaminant is observed using the HEBM method due to the erosion of the milling tools. Their thermal stability in air has been analyzed by thermogravimetric analyzes (TGA) complemented by X‐ray diffraction (XRD) analyses. It is shown that CoxNi1‐xO solid solutions are stable at 1000°C over the whole composition range whereas they are only stable for x ≤46 and x ≤22 at 800°C and 700°C, respectively. For higher Co contents, the formation of Co3O4 is observed. This is a relevant information for their future use for Al production, which can be done at different temperatures (~700‐1000°C) depending of the electrolyte composition. This article is protected by copyright. All rights reserved.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 6
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    The Origin of Anomalous Water Diffusion in Silica Glasses at Low Temperatures (2017)
    Wiley
    Details
    Publication Date: 2017-05-10
    Description: Anomalous water diffusion into SiO 2 glass was observed in a low temperature range, below ~ 850°C, under a constant water vapor pressure of 355 Torr (47.3 kPa). Both the effective water diffusion coefficient and water solubility exhibited an anomalous time-dependence. For example, water solubility in the low temperature range increased initially, achieving much higher values than expected based on extrapolation from higher temperature data, and then decreased with time toward an equilibrium value. This phenomenon was reported earlier, but a complete explanation was not possible; a new model is presented based upon glass surface compressive stress generation and subsequent surface stress relaxation. Water diffusion can promote stress generation and stress relaxation, both of which affect the reaction between diffused molecular water and the glass structure. By considering these stress effects, the anomalous water diffusion behavior in silica glass is explained. Furthermore, the same model can account for the reversal of external tensile and compressive stress effects on water solubility and diffusivity in silica glass observed after a few hours of heat-treatment at 650°C in 355 Torr water vapor pressure. This article is protected by copyright. All rights reserved.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
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    Electrical Conductivity and Defect Disorder of Tantalum Doped TiO2 (2017)
    Wiley
    Details
    Publication Date: 2017-05-03
    Description: The present work reports the electrical properties of polycrystalline Ta-doped TiO 2 (0.39 at.% Ta) determined in situ at elevated temperatures (1173 K - 1323 K) in the gas phase of controlled oxygen activity (10 -12 Pa to 10 4 Pa). The effect of oxygen activity on the electrical conductivity and thermoelectric power of TiO 2 is discussed in terms of defect disorder, including (1) the intrinsic electronic disorder that is governed by electronic compensation in the strongly reducing regime, (2) the extrinsic electronic disorder that is governed by electronic charge compensation in the reducing regime and (3) the extrinsic ionic disorder that is governed by ionic compensation in the oxidising regime. It is shown that tantalum ions are incorporated into the titanium sublattice of TiO 2 leading to the formation of donor-type energy levels. The Arrhenius-type plot of the electrical conductivity data leads to the determination of the formation enthalpy terms. The obtained results are considered in terms of the effect of tantalum and oxygen activity on the defect disorder and the associated key performance-related properties in the light-induced partial water oxidation. This article is protected by copyright. All rights reserved.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    The charge state of titanium ions in Pd-doped Ti:CMAS glass and glass-ceramics (2017)
    Wiley
    Details
    Publication Date: 2017-04-04
    Description: We have investigated the role of charge state of Ti in the electronic properties and structure of electrically conductive CMAS-TiO 2 -Pd glass and glass-ceramics by X-ray photoelectron spectroscopy, electron paramagnetic resonance, positron annihilation lifetime spectroscopy, and fluorescence spectroscopy. These studies suggest the concentration of Ti 3+ ions was, at most, ~0.1 wt% in glass-ceramics devitrified in the reducing atmosphere of forming gas; no other glass or glass-ceramic samples exhibited measurable levels of Ti 3+ . The observed fluorescence at liquid nitrogen temperature in parent glasses and glass-ceramics obtained in air is explained by UV-induced charge-transfer processes involving Ti 4+ ions and oxygen surroundings. The X-ray photoelectron spectroscopy data are correlated with rutile, anorthite, diopside, and titanite crystalline phases identified in Pd-free and Pd-doped Ti:CMAS glass-ceramics earlier.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
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    Visualization of Biomedical Data (2018)
    Annual Reviews
    Details
    Publication Date: 2018-07-20
    Description: The rapid increase in volume and complexity of biomedical data requires changes in research, communication, and clinical practices. This includes learning how to effectively integrate automated analysis with high–data density visualizations that clearly express complex phenomena. In this review, we summarize key principles and resources from data visualization research that help address this difficult challenge. We then survey how visualization is being used in a selection of emerging biomedical research areas, including three-dimensional genomics, single-cell RNA sequencing (RNA-seq), the protein structure universe, phosphoproteomics, augmented reality–assisted surgery, and metagenomics. While specific research areas need highly tailored visualizations, there are common challenges that can be addressed with general methods and strategies. Also common, however, are poor visualization practices. We outline ongoing initiatives aimed at improving visualization practices in biomedical research via better tools, peer-to-peer learning, and interdisciplinary collaboration with computer scientists, science communicators, and graphic designers. These changes are revolutionizing how we see and think about our data.
    Electronic ISSN: 2574-3414
    Topics: Computer Science , Medicine
    Published by Annual Reviews
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  • 10
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    Motion of Deformable Drops Through Porous Media (2017)
    Annual Reviews
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    Publication Date: 2017-01-03
    Print ISSN: 0066-4189
    Electronic ISSN: 1545-4479
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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