Results 1 to 10 of about 11,339,355 (391)

Instantaneous activation energy of alkali activated materials

open access: diamondRILEM Technical Letters, 2019
Alkali activated materials (AAM) are generally cured at high temperatures to compensate for the low reaction rate. Higher temperature accelerates the reaction of AAM as in cement-based materials and this effect is generally predicted using Arrhenius ...
Shiju Joseph   +2 more
doaj   +3 more sources

Elemental composition of moss and lichen species in eastern Serbia [PDF]

open access: yesNuclear Technology and Radiation Protection, 2018
Instrumental neutron activation analysis is used to determine a content of 47 elements (Na, Mg, Al, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni, Co, Cu, Zn, As, Se, Br, Rb, Sr, Zr, Mo, Ag, Cd, Sb, I, Ba, Cs, La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Tm, Yb, Lu ...
Ajtić Jelena V.   +5 more
doaj   +1 more source

Insight into Dynamic of Mono and Hybrid Nanofluids Subject to Binary Chemical Reaction, Activation Energy, and Magnetic Field through the Porous Surfaces

open access: yesMathematics, 2022
The mathematical modeling of the activation energy and binary chemical reaction system with six distinct types of nanoparticles, along with the magnetohydrodynamic effect, is studied in this paper. Different types of hybrid nanofluids flowing over porous
Qadeer Raza   +6 more
doaj   +1 more source

Thermal effect and kinetic analysis of secondary spontaneous combustion of pre-oxidized coal

open access: yesMeikuang Anquan, 2022
In order to study the secondary spontaneous combustion of coal treated with different pre-oxidation temperatures, pre-oxidized coals with different temperatures were prepared by temperature programmed device.
ZHANG Wenhao, YU Tao
doaj   +1 more source

Post-harvesting of Solanum paniculatum L. leaves. Part I: Drying kinetics [PDF]

open access: yesRevista Brasileira de Engenharia Agrícola e Ambiental, 2020
Solanum paniculatum L. (jurubeba) is among the numerous medicinal plants used by the Brazilian population, and the use of its leaves is quite popular, in the form of tea, as a remedy against hangovers after excessive consumption of alcohol and food ...
Elton A. S. Martins   +5 more
doaj   +1 more source

Synthesis, characterization and thermal degradation kinetics of a new pyrazole derived methacrylate polymer, poly(1,3-diphenyl-1H-pyrazol-5-yl methacrylate)

open access: yesActa Chimica Slovenica, 2022
A new pyrazole derived methacrylate monomer, 1,3-diphenyl-1H-pyrazol-5-yl methacrylate, was synthesized from the reaction of 1,3-diphenyl-5-pyrazolone with methacryloyl chloride in the presence of triethylamine.
Adnan Kurt, Murat Koca
doaj   +1 more source

Activation Energies and Beyond [PDF]

open access: yesThe Journal of Physical Chemistry A, 2019
Recent advances in the calculation and interpretation of the activation energy for a dynamical process are described. Specifically, new approaches that apply the fluctuation theory of statistical mechanics to dynamics enable the direct determination of the activation energy for an arbitrary dynamical time scale from simulations at a single temperature.
Zeke A. Piskulich   +2 more
openaire   +2 more sources

From free-energy profiles to activation free energies

open access: yesThe Journal of Chemical Physics, 2022
Given a chemical reaction going from reactant (R) to the product (P) on a potential energy surface (PES) and a collective variable (CV) discriminating between R and P, we define the free-energy profile (FEP) as the logarithm of the marginal Boltzmann distribution of the CV. This FEP is not a true free energy. Nevertheless, it is common to treat the FEP
Johannes C. B. Dietschreit   +4 more
openaire   +3 more sources

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