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  • 1
    Electronic Resource
    Electronic Resource
    Ceramic Composites for Automotive Friction Devices (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 1394-1398 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Advanced braking devices can represent a promising application for ceramic matrixcomposites (CMC) with functional and structural properties. If the actual advanced brakingmaterials could be at least partially replaced by CMCs, it might become the first consumer marketfor these materials. CMC containing three main phases, silicon carbide, graphite and carbon fiberswere prepared. A systematic analysis of the processing-structure-properties relationship of thecomposite is carried out. In particular, silicon carbide provides the necessary hardness, whereasgraphite is used for its lubricating properties, and carbon fibers are used as reinforcement. Thesamples, prepared using a reactive bonding technique, exhibited adequate mechanical properties,high resistance to thermal shocks and good stability after many thermal cycles. Morphological andstructural investigations have been performed to optimize the content of each component.Preliminary tribological investigations are presented
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.1394.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Bulk Crystllization Kinetics of New TPI (Thermoplastic Poly Imide) by Differential Calorimetric Analysis (1996)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 203 (Feb. 1996), p. 25-30 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.203.25.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Convergence Across Italian Regions and the Role of Technological Catch-Up (2006)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Topics in macroeconomics 6.2006, 1, art15 
    Details
    ISSN: 1534-5998
    Source: Berkeley Electronic Press Academic Journals
    Topics: Economics
    Notes: This paper suggests that the main (and possibly unique) source of beta- and sigma-convergence in GDP per worker (i.e. labor productivity) across Italian regions over the 1980-2004 period is the change in technical and allocative efficiency, i.e. convergence in relative TFP levels. To obtain this result, I construct an approximation of the production frontier at different points in time using Data Envelope Analysis (DEA), and measure efficiency as the output-based distance from the frontier. This method is entirely data-driven, and does not require the specification of any particular functional form for technology. Changes in GDP per worker can be decomposed into changes in relative efficiency, changes due to overall technological progress, and changes due to capital deepening. My results suggest that: (i) differences in relative TFP are quantitatively important; (ii) while technological progress and capital deepening are the main, and equally important, forces behind the rightward shift in the distribution of GDP per worker, convergence in relative TFP is the main determinant of the change in its shape.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/bejm/topics/vol6/iss1/art15
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  • 4
    Electronic Resource
    Electronic Resource
    Specialization Patterns and the Factor Bias of Technology (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    The @B.E. journal of macroeconomics 7.2007, 1, art16 
    Details
    ISSN: 1555-0486
    Source: Berkeley Electronic Press Academic Journals
    Topics: Economics
    Notes: Development accounting exercises based on an aggregate production function find technology is biased in favor of a country's abundant production factors. We provide an explanation for this finding based on the Heckscher-Ohlin model. Countries trade and specialize in the industries that use intensively the production factors they are abundantly endowed with. For given factor endowment ratios, this implies smaller international differences in factor price ratios than under autarky. Thus, when measuring the factor bias of technology with the same aggregate production function for all countries, they appear to have an abundant-factor bias in their technologies.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/bejm/vol7/iss1/art16
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal analysis of thermoplastic matrices for advanced composite materials: poly(phenylene sulphide)
    Amsterdam : Elsevier
    Thermochimica Acta 199 (1992), S. 133-146 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(92)80257-W
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  • 6
    Electronic Resource
    Electronic Resource
    A new kinetic model for polymer crystallization derived by calorimetric analysis
    Amsterdam : Elsevier
    Thermochimica Acta 227 (1993), S. 83-95 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(93)80252-6
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  • 7
    Electronic Resource
    Electronic Resource
    Cure behaviour of visible light activated dental composites (1995)
    Springer
    Journal of materials science 6 (1995), S. 161-166 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: In this paper, the non-isothermal cure behaviour of a dental composite, activated by visible light, is described using a heat transfer model that, coupled with a reaction kinetic expression, is able to predict the temperature and the degree of reaction in the composite. The temperature and the degree of reaction profiles inside the composite are calculated, as a function of the cure time, taking into account the system geometry, the thermal diffusivity of the composite, and the resin reaction rate. Material properties, boundary and initial conditions and the kinetic behaviour are the input data of the heat transfer model. Once the degree of reaction is known, the glass transition temperature profiles across the thickness of the composite are calculated. Experimentally measured glass transition temperatures are used for the evaluation of an extinction coefficient capable of accounting for the effects of the light absorption through the thickness on the polymerization kinetics. Finally, the effects of the non-isothermal cure conditions on the application of these materials in dental restorations are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120293
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  • 8
    Electronic Resource
    Electronic Resource
    In-situ polymerization behaviour of bone cements (1997)
    Springer
    Journal of materials science 8 (1997), S. 75-83 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The polymerization behaviour of bone cements during total hipreplacements is characterized by a fast and highly non-isothermal bulk reaction.In the first part of this paper the reaction kinetics are analysed bycalorimetric analysis in order to determine the rates of polymerization inisothermal and non-isothermal conditions. A phenomenological kinetic model,accounting for the effects of autoacceleration and vitrification, is presented.This model, integrated with an energy balance, is capable of predicting thetemperature across the prosthesis, the cement and the bone and the degree ofreaction in the cement, during in situ polymerization. The temperatureand the degree of reaction profiles are calculated, as a function of the settingtime, taking into account the system geometry, the thermal diffusivity of bone,prosthesis and cement, and the heat rate generated by the reaction according tothe kinetic model. Material properties, boundary and initial cond!itions are the input data of the heat transfer model. Kinetic and heat transfermodels are coupled and a numerical solution method is used. The model is appliedin order to study the effects of different application procedures on temperatureand degree of reaction profiles across the bone–cement–prosthesissystem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018502731892
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  • 9
    Electronic Resource
    Electronic Resource
    Cure behaviour of visible light activated dental composites (1995)
    Springer
    Journal of materials science 6 (1995), S. 155-160 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: During curing of multifunctional methacrylate-based composites for dental restorations, strong structural changes, significantly affecting the final properties of the materials, are observed. In fact, the polymerization of thermoset matrices involves the transformation of a viscous liquid in a glassy network. The final glass transition temperature of the composite matrix may be considered a relevant parameter for the durability of a restoration. In this study, the complex cure behaviour of a commercial dental composite, activated by visible-light, is analysed by differential scanning calorimetry (DSC). The maximum degree of reaction of the crosslinked resin and the characteristic glass transition temperature are quantitatively related to the cure temperature. Furthermore, a kinetic model, accounting also for the diffusion control effects associated with vitrification, is presented. Finally, the cure behaviour expected during practical application of these materials in the oral cavity for dental restorations, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120292
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  • 10
    Electronic Resource
    Electronic Resource
    Polymerization kinetics of acrylic bone cements by differential scanning calorimetry (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 35-49 
    Details
    ISSN: 1572-8943
    Keywords: bone cement ; DSC ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Bone cements are widely used for the fixation of metallic prostheses in orthopaedics and to form replacements for skull defects in neurosurgery. Acrylic bone cements are based on a mixture of methyl methacrylate (MMA) and a fine powder of polymethyl methacrylate (PMMA). The polymerization of the bone cement occurs in contact with the bone and the prosthesis which act as the boundaries of a bulk polymerization reactor. The kinetic behaviour of the bone cement plays a fundamental role for the final performance of the implant. In this paper, the isothermal and non-isothermal polymerization behaviour of a commercial bone cement is described. A simple phenomenological model, accounting for the autoacceleration ffect, for a diffusion controlled termination mechanism and for the reaction between inhibitor and initiator, is proposed. The reaction kinetics is analysed by DSC. DSC data are used for the determination of the rates of polymerization under isothermal and non-isothermal conditions. The experimental data are processed to calculate the parameters of the proposed phenomenological kinetic model. The analytical and numerical details related to the integration of the model are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01982684
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