Effect of temperature on hydration kinetics of sesame seeds (Sesamum indicum L.)

2009 ◽  
Vol 91 (4) ◽  
pp. 542-552 ◽  
Author(s):  
Javad Khazaei ◽  
Narjes Mohammadi
Keyword(s):  
Sesamum Indicum ◽  
Effect Of Temperature ◽  
Hydration Kinetics ◽  
Sesame Seeds ◽  
Kinetics Of

Hydration Kinetics of Rice Kernels under Vacuum and Pressure

2008 ◽  
Vol 4 (4) ◽  
Author(s):  
Marcelo O Bello ◽  
Marcela P Tolaba ◽  
Constantino Suárez
Keyword(s):  
Moisture Content ◽  
Atmospheric Pressure ◽  
Absorption Rate ◽  
Effect Of Temperature ◽  
Hydration Kinetics ◽  
Soaking Time ◽  
Saturation Time ◽  
Rough Rice ◽  
Pressure Tests ◽  
Kinetics Of

Hydration of rough rice under vacuum (0.01, 0.03, 0.06, 0.08 MPa) and pressure (0.25, 0.4, 0.55 and 0.7 MPa) was conducted at 15°, 35° and 55°C. As a reference, hydration tests at each temperature and atmospheric pressure were also conducted. For vacuum and pressure tests the Peleg equation was found suitable to predict hydration kinetics of rice. Peleg constants, k1 and k2, inversely related to the absorption rate (q) and the saturation moisture content (me), respectively, were estimated. The response surface method (RSM) was used to optimize the effect of temperature and pressure on q, me and saturation time (tsat) for vacuum and pressure hydration. The predicted optimum conditions required to maximize absorption rate and saturation moisture content together with the minimization of saturation time, were: a) hydration at 55°C and 0.01 MPa for vacuum tests; and b) hydration at 55°C and 0.59 MPa for pressure tests. For vacuum hydration the optimum responses were: q = 6.01 (g water/g dry basis) min-1, me = 0.3488 (dry basis) and tsat = 58 minutes. For pressure hydration the optimum responses were: q = 6.98 (g water/g dry basis) min-1, me = 0.3839 (dry basis) and tsat = 42 minutes. Both procedures, vacuum and pressure hydration, resulted as more convenient than hydration at atmospheric pressure. However, pressure hydration conducted to a higher hydration rate and saturation moisture content needed less soaking time.

Temperature Effect on the Two-Dimensional Phase Transition Kinetics of Adenine Adsorbed at the Hg Electrode/Aqueous Solution Interface

2003 ◽  
Vol 68 (8) ◽  
pp. 1407-1419 ◽  
Author(s):  
Claudio Fontanesi ◽  
Roberto Andreoli ◽  
Luca Benedetti ◽  
Roberto Giovanardi ◽  
Paolo Ferrarini
Keyword(s):  
Phase Transition ◽  
Aqueous Solution ◽  
Phase Change ◽  
Temperature Effect ◽  
Transition Rate ◽  
Effect Of Temperature ◽  
Two Dimensional ◽  
Solution Interface ◽  
Phase Transition Kinetics ◽  
Kinetics Of

The kinetics of the liquid-like → solid-like 2D phase transition of adenine adsorbed at the Hg/aqueous solution interface is studied. Attention is focused on the effect of temperature on the rate of phase change; an increase in temperature is found to cause a decrease of transition rate.

scholarly journals Cement-Based Renders Manufactured with Phase-Change Materials: Applications and Feasibility

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Luigi Coppola ◽  
Denny Coffetti ◽  
Sergio Lorenzi
Keyword(s):  
Compressive Strength ◽  
Phase Change ◽  
Phase Change Materials ◽  
Residential Buildings ◽  
Setting Time ◽  
Drying Shrinkage ◽  
Hydration Kinetics ◽  
Mechanical Performances ◽  
Entrapped Air ◽  
Kinetics Of

The paper focuses on the evaluation of the rheological and mechanical performances of cement-based renders manufactured with phase-change materials (PCM) in form of microencapsulated paraffin for innovative and ecofriendly residential buildings. Specifically, cement-based renders were manufactured by incorporating different amount of paraffin microcapsules—ranging from 5% to 20% by weight with respect to binder. Specific mass, entrained or entrapped air, and setting time were evaluated on fresh mortars. Compressive strength was measured over time to evaluate the effect of the PCM addition on the hydration kinetics of cement. Drying shrinkage was also evaluated. Experimental results confirmed that the compressive strength decreases as the amount of PCM increases. Furthermore, the higher the PCM content, the higher the drying shrinkage. The results confirm the possibility of manufacturing cement-based renders containing up to 20% by weight of PCM microcapsules with respect to binder.

A STUDY OF THE MECHANISM AND KINETICS OF THE SULPHITE PROCESS

1939 ◽  
Vol 17b (4) ◽  
pp. 121-132 ◽  
Author(s):  
J. M. Calhoun ◽  
F. H. Yorston ◽  
O. Maass
Keyword(s):  
Temperature Coefficient ◽  
Arrhenius Equation ◽  
Practical Interest ◽  
Effect Of Temperature ◽  
Wood Meal ◽  
Spruce Wood ◽  
Mechanism And Kinetics ◽  
Kinetics Of

The rate of delignification of resin extracted spruce wood-meal has been determined in calcium-base sulphite liquor at temperatures from 130 °C. down to 50 °C. No break was found in the temperature coefficient curve at the lower temperatures, the reaction following the Arrhenius equation closely. Possible mechanisms of the reaction are discussed in the light of existing theories, and the effect of temperature on the yield of pulp is pointed out for its practical interest.

Degradation of hydration kinetics of proton-conducting Ba(Zr0.84Y0.15Cu0.01)O3−δ during conductivity-relaxation experiment

2016 ◽  
Vol 332 ◽  
pp. 299-304 ◽  
Author(s):  
Sung Min Choi ◽  
Jong-Heun Lee ◽  
Jongsup Hong ◽  
Kyung Joong Yoon ◽  
Ji-Won Son ◽  
...  
Keyword(s):  
Conductivity Relaxation ◽  
Hydration Kinetics ◽  
Proton Conducting ◽  
Relaxation Experiment ◽  
Kinetics Of
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