The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Tobias Kehl - One of the best experts on this subject based on the ideXlab platform.
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A high performance sensor for heat-flux Differential Scanning Calorimetry
Thermochimica Acta, 1990Co-Authors: G. Van Der Plaats, Tobias KehlAbstract:A new sensor for heat-flux Differential Scanning Calorimetry is introduced. A description is given of the construction of the sensor, the specifications are discussed and an illustration is given of the performance of the sensor. ?? 1990.
G. Van Der Plaats - One of the best experts on this subject based on the ideXlab platform.
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A high performance sensor for heat-flux Differential Scanning Calorimetry
Thermochimica Acta, 1990Co-Authors: G. Van Der Plaats, Tobias KehlAbstract:A new sensor for heat-flux Differential Scanning Calorimetry is introduced. A description is given of the construction of the sensor, the specifications are discussed and an illustration is given of the performance of the sensor. ?? 1990.
Hugo Gloria - One of the best experts on this subject based on the ideXlab platform.
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Assessment of the quality of heated oils by Differential Scanning Calorimetry
Journal of Agricultural and Food Chemistry, 1998Co-Authors: Hugo Gloria, José Miguel AguileraAbstract:Differential Scanning Calorimetry (DSC) was used to follow changes in the thermal characteristics of commercial frying oils (sunflower seed, colza, and groundnut) during heating at 180 °C for up to 10 h. DSC tracings of oils scanned from 10 to −80 °C were characterized by a single crystallization peak (CP) at −43 to −48 °C. Heating of oils resulted in a progressive shift of the CP to lower temperatures and reduced enthalpies of crystallization (EC). The temperature of the CP decreased as much as 27 °C, and the EC was reduced by almost 90% after heating for 10 h. These changes in thermal characteristics correlated well with the appearance of polar compounds, the increase in viscosity, and color changes of the oil. DSC is a fast method of analysis, requires small samples (15−60 mg) with minimal preparation, and may be implemented directly in fried products. Keywords: Differential Scanning Calorimetry; oil; frying; quality; enthalpy; viscosity; color
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determination of oil in fried potato products by Differential Scanning Calorimetry
Journal of Agricultural and Food Chemistry, 1997Co-Authors: José Miguel Aguilera, Hugo GloriaAbstract:Differential Scanning Calorimetry (DSC) was used to determine the oil uptake of commercial frozen par-fried potatoes after frying at 180 °C in colza/soybean oil. The enthalpy and temperature range of the crystallization peak for the pure frying oil were 47.2 J/g and −44 to −50 °C, respectively. DSC was performed by cooling samples of crust and core of fried potatoes from 10 to −60 °C at 1 °C/min and the oil content calculated from the peak area. The crust contained almost 6 times as much oil as the central core (23.6% vs 4%, dry weight basis), as visualized by light microscopy. Only 87% of the oil in the intact crust can be removed by solvent extraction, the rest being extractable only after grinding. Deviation between DSC and Soxtec extraction methods was less than 3%. The DSC method is fast, specific, and reliable, does not use solvents, requires smaller samples (<100 mg) than conventional solvent extraction methods, and can also detect freezable water. Keywords: Differential Scanning Calorimetry; oil; ...
Yasuo Saruyama - One of the best experts on this subject based on the ideXlab platform.
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Entropy production in temperature modulated Differential Scanning Calorimetry
Journal of Thermal Analysis and Calorimetry, 2008Co-Authors: Jean-luc Garden, Jacques Richard, Yasuo SaruyamaAbstract:The non-equilibrium process due to irreversible heat exchanges occurring during a temperature modulated Differential Scanning Calorimetry experiment is investigated in detail. This enables us to define an experimental frequency dependent complex heat capacity from this calorimetric method. The physical meaning of this dynamic heat capacity is discussed. A relationship is clearly established between the imaginary part of this complex quantity and the net entropy created during the experimental time-scale.
M. G. Rogers - One of the best experts on this subject based on the ideXlab platform.
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Characterization of molecular orientation by Differential Scanning Calorimetry
Journal of Materials Science, 1991Co-Authors: M. G. RogersAbstract:Differential Scanning Calorimetry was used to study the injection moulding and biaxial orientation of polystyrene. Single exothermic peaks were observed for uniaxial orientation, whereas multiple relaxations were observed for biaxial orientation. The temperatures of the relaxations followed the general relationship T _i=1.02 T _i(K) where T _i>T_i⩾T_g and ( j−i ) = 1. In the case of injection-moulded samples, the overall dimensional shrinkage did not correlate with the enthalpy determined by Differential Scanning Calorimetry, indicating nonaffine behaviour between dimensional and molecular orientation.
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Characterization of molecular orientation by Differential Scanning Calorimetry
Journal of Materials Science, 1991Co-Authors: M. G. RogersAbstract:Differential Scanning Calorimetry was used to study part quality from an injection blow moulding machine producing polystyrene thin-walled containers. Cavity-to-cavity, within cavity and shot-to-shot problems were detected. Multiple relaxation peaks observed in the temperature range T _g-T_LL had the relationship T _j=1.02 T _i K, for T _LL⩾T_j> T_i⩾ T_g and ( j−i )=1. Based on some simple assumptions, a model was developed that allowed the multiple peaks be resolved between the injection moulding and blowing steps of the process and into a three-dimensional array.
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Characterization of molecular orientation by Differential Scanning Calorimetry
Journal of Materials Science, 1991Co-Authors: M. G. RogersAbstract:Differential Scanning Calorimetry was used to study relaxations occurring above the glass transition, Tg for a number of characterized and fabricated polystyrenes. Part 1 of this study examines the liquid-liquid relaxation temperature, TLL; Part 2 the effects of injection moulding and biaxial orientation of polystyrene; and Part 3 deals with the effects of injection blow moulding.