Results 21 to 30 of about 1,731,917 (295)

A Possible Role for Singlet Oxygen in the Degradation of Various Antioxidants. A Meta-Analysis and Review of Literature Data

Antioxidants, 2018
The thermodynamic parameters Eact, ΔH≠, ΔS≠, and ΔG≠ for various processes involving antioxidants were calculated using literature kinetic data (k, T). The ΔG≠ values of the antioxidants’ processes vary in the range 91.27–116.46 kJmol−1 at 310 K.
Athinoula L. Petrou, Petros L. Petrou, Theodoros Ntanos, Antonis Liapis   +3 more
doaj   +1 more source

Relaxation dynamics of Fe55Cr10Mo14C15B6 metallic glass explored by mechanical spectroscopy and calorimetry measurements [PDF]

, 2016
In this work, the mechanical relaxation dynamics of Fe55Cr10Mo14C15B6 metallic glass is explored by mechanical spectroscopy. The temperature-dependent loss modulus E″(T) shows the features of β relaxation well below glass transition temperature Tg.
Crespo Artiaga, Daniel, Liu, Chaoren, Madinehei, Seyed Milad, Pineda Soler, Eloi   +3 more
core   +2 more sources

Enhancement of thermal properties of Al/MoO3 thermite by electrostatic spraying

Engineering Reports, 2023
To improve the thermal properties of thermite safely and stably, electrostatic spraying was used to prepare the Al/MoO3 thermite. The Al/MoO3 thermites were detected and characterized by scanning electron microscopy (SEM) and X‐ray diffraction (XRD), and
Jialin Chen, Shutao Li, Du Chen, Lin Gao, Yeqing Chen, Jiaxing Song   +5 more
doaj   +1 more source

Instantaneous activation energy of alkali activated materials

RILEM 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, Siva Uppalapati, Ozlem Cizer   +2 more
doaj   +1 more source

Internal energy change and activation energy effects on Casson fluid

AIP Advances, 2020
This paper examines the steady-state momentum heat and mass transfer flow of a Casson fluid flow in the existence of a pre-exponential factor. The velocity of the fluid over a vertical stretched pin changes linearly with the axial distance when a Casson ...
T. Salahuddin, Nazim Siddique, Maryam Arshad, I. Tlili   +3 more
doaj   +1 more source

Theoretical investigation of carbon defects and diffusion in α-quartz [PDF]

, 2001
The geometries, formation energies, and diffusion barriers of carbon point defects in silica (α-quartz) have been calculated using a charge-self-consistent density-functional based nonorthogonal tight-binding method.
A. Edwards, Christof Köhler, D. Porezag, D. R. Hamann, E. Rauls, E. Rauls, F. J. Norton, G. Pacchioni, G. T. Barkema, H. Monkhorst, I. Mizushima, J. D. Kalen, J. Mikkelsen, Jr., J. R. Chelikowsky, K. Sano, M. Elstner, M. Heggie, M. Kaukonen, N. Binggeli, O. H. Krafcsik, Péter Deák, R. Doremus, R. Kaschner, R. W. G. Wyckoff, Sándor Suhai, T. Di Stefano, Th. Frauenheim, Thomas Frauenheim, V. V. Afanasev, Yong-nian Xu, Z. Fang, Z. Zheng, Zoltán Hajnal   +32 more
core   +1 more source

Thermal behavior of diesel, honge oil methyl ester and ITS B-20 blend in atmospheric air and oxygen

International Journal of Sustainable Engineering, 2022
Thermal behavior of honge oil methyl ester (HOME) and its B-20 blend (20% HOME and 80% diesel) is examined by performing calorimetric experiments at 10°C/min heating rate in atmospheric air and oxygen medium.
Vinay Atgur, G. Manavendra, G.P. Desai, N. R. Banapurmath, Chandramouli Vadlamudi, Sanjay Krishnappa, B. Nageswara Rao   +6 more
doaj   +1 more source

Landscape equivalent of the shoving model [PDF]

, 2003
It is shown that the shoving model expression for the average relaxation time of viscous liquids follows largely from a classical "landscape" estimation of barrier heights from curvature at energy minima. The activation energy involves both instantaneous
A. Heuer, A.P. Sokolov, A.V. Granato, A.V. Granato, C.A. Angell, C.A. Angell, C.A. Angell, C.M. Roland, C.P. Flynn, D. Kivelson, D. Quitmann, D.F. Calef, D.J. Plazek, F.W. Starr, G. Wyllie, H.-X. Zhou, J.C. Dyre, J.C. Dyre, J.C. Dyre, J.C. Dyre, Jeppe C. Dyre, K. Broderix, L. Angelani, M. Goldstein, M. Mooney, M.M. Teeter, N.B. Olsen, Niels Boye Olsen, R. Böhmer, R. Böhmer, R.A. Marcus, R.F. Grote, R.W. Hall, S. Sastry, S.V. Nemilov, T.B. Schrøder, U. Buchenau, V.N. Novikov, W. Kauzmann   +38 more
core   +2 more sources

IGNITION ACTIVATION ENERGY OF MATERIALS BASED

Transactions of the VŠB: Technical University of Ostrava, Safety Engineering Series, 2016
This contribution is aimed to compare the values of the ignition activation energies of two types of polyamide – Slovamid 6 FRB and Slovamid GF 50 LTS. Samples were isothermally stressed at five different temperatures between 500 °C a 550 °C, while the ...
Peter RANTUCH, Igor WACHTER, Ivan HRUŠOVSKÝ, Karol BALOG   +3 more
doaj   +1 more source

4-propoxy-biphenyl-4-carbonitrile Nematik Sıvı Kristalinin Dielektrik Özellikleri

Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2021
Bu çalışmada, nematik fazdaki 4-propoxy-biphenyl-4-carbonitrile’in sıcaklığa bağlı dielektrik geçirgenliğinin ölçümleri raporlanmıştır. Bu amaçla 1 kHz ila 1MHz frekans aralığında sıcaklığa bağlı dielektrik karakterizasyonu gerçekleştirilmiştir.
Pınar Özden, Atilla Eren Mamuk, Nejmettin Avci, Şadan Özden   +3 more
doaj   +1 more source