Results 211 to 220 of about 506,757 (254)
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Measurement of apparent sintering activation energy for densification of clays
Clay Minerals, 2021AbstractClays are raw materials with properties that are necessary for the manufacture of ceramic tiles. The characteristics of clay ceramic raw materials may vary within the same mineral deposit. Clay blending promotes better use of clay reserves, thereby increasing the applicability and life cycle of raw materials.
André Biava Comin +7 more
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The effect of phospholipids on the apparent activation energy of (Na+-K+)-ATPase
Biochimica et Biophysica Acta (BBA) - Biomembranes, 1972The Arrhenius plots of ATPase activities by (Na+-K+)-ATPase (ATP phosphohydrolase, EC 3.6.1.3) preparation treated with phospholipase A (phosphatide acylhydrolase, EC 3.1.1.4) gave a single straight line and the apparent activation energy was approximately 30 kcal/mole, while the plots of the control preparation gave two straight lines intersecting at ...
K, Taniguchi, S, Iida
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True and apparent activation energies of enzymic reactions
Biochimica et Biophysica Acta, 1953Abstract 1. 1. From a consideration of the Michaelis equation and the Arrhenius equation, it is shown that it is necessary to distinguish two quantities in enzymic activation: a. the heat of formation of the enzyme-substrate complex, and b. the energy of activation of this complex; and an equation is derived connecting these two quantities ...
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Apparent activation energy of structural relaxation for Se70Te30 glass
Journal of Non-Crystalline Solids, 2010Abstract Differential scanning calorimetry and dc conductivity measurements were used to study structural relaxation of Se70Te30 glass. A single set of Tool–Narayanaswamy–Moynihan (TNM) parameters was obtained from the curve-fitting procedure. The value of apparent activation energy Δh∗ was further confirmed by two non-fitting techniques.
Roman Svoboda +2 more
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On apparent activation energies of creep in nickel-base superalloys
Scripta Materialia, 1999Generally, the steady state is well defined in the creep curve in pure metals and some single-phase alloys. In this case, the diagram log {dot {epsilon}} vs. {epsilon} (where {epsilon} is the plastic strain) shows an extensive range of strain where the steady-state creep rate is maintained approximately constant.
Alberto C. Picasso, Angel J. Marzocca
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Apparent Activation Energy of Viscous Flow in Pectin Jellies
Journal of Food Science, 1981ABSTRACT A change of state in a cooling jelly sol is preceded by a narrow temperature interval of viscous flow that may be measured, in order to compute the activation energy of such flow. The contribution of decreasing temperatures to the viscosity‐increase was 10 6 times ...
REGINALD H. WALTER, RUTH M. SHERMAN
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The apparent activation energy for serrated yielding
Philosophical Magazine, 1969Abstract The activation energy for serrated yielding has previously been found to vary with grain size. It is suggested that this apparent variation may be explained by including the influence of grain size on dislocation density in the theory proposed by Cottrell (1953) and subsequently developed by various authors.
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Oscillations in the iodate-Mn2+ system: Apparent energy of activation
Journal of Chemical Education, 1979Describes the effect of temperature on the time of oscillations and the determination of the apparent energy of activation of the overall process.
R. Ramaswamy +3 more
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Effects of Supplementary Cementitious Materials on Apparent Activation Energy
Journal of ASTM International, 2010Abstract The application of the Arrhenius equation to characterize the progress of cement hydration requires the use of an apparent activation energy (Ea) value to describe the temperature sensitivity of the combined hydration reactions.
J. L. Poole +4 more
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Determination of degradation apparent activation energy values of polymers
Journal of Thermal Analysis and Calorimetry, 2002The isothermal degradation of three aromatic polyetherketones was studied in an inert environment at various temperatures in the range 683-803 K. In the first degradation stage (mass loss D£20%) a linear increase of D as a function of heating time (t) was observed and the corresponding kinetic D=D o+bt equations at various temperatures were directly ...
L: Abate +3 more
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