Journal articles: 'Activation energy'

1

Mercer, Kenneth L. "Activation Energy." Journal - American Water Works Association 111, no. 10 (October 2019): 2. http://dx.doi.org/10.1002/awwa.1374.

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Romanyshyn, Yuriy, Andriy Smerdov, and Svitlana Petrytska. "Energy Model of Neuron Activation." Neural Computation 29, no. 2 (February 2017): 502–18. http://dx.doi.org/10.1162/neco_a_00913.

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On the basis of the neurophysiological strength-duration (amplitude-duration) curve of neuron activation (which relates the threshold amplitude of a rectangular current pulse of neuron activation to the pulse duration), as well as with the use of activation energy constraint (the threshold curve corresponds to the energy threshold of neuron activation by a rectangular current pulse), an energy model of neuron activation by a single current pulse has been constructed. The constructed model of activation, which determines its spectral properties, is a bandpass filter. Under the condition of minimum-phase feature of the neuron activation model, on the basis of Hilbert transform, the possibilities of phase-frequency response calculation from its amplitude-frequency response have been considered. Approximation to the amplitude-frequency response by the response of the Butterworth filter of the first order, as well as obtaining the pulse response corresponding to this approximation, give us the possibility of analyzing the efficiency of activating current pulses of various shapes, including analysis in accordance with the energy constraint.

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3

Mirzaee, E., S. Rafiee, A. Keyhani, and Z. Emam-Djomeh. "Determining of moisture diffusivity and activation energy in drying of apricots." Research in Agricultural Engineering 55, No. 3 (September 22, 2009): 114–20. http://dx.doi.org/10.17221/8/2009-rae.

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In this study, Fick’s second law was used as a major equation to calculate the moisture diffusivity for apricot fruit with some simplification. Drying experiments were carried out at the air temperatures of 40, 50, 60, 70, and 80°C and the drying air velocity of 1, 1.5 and 2 m/s. The experimental drying curves showed only a falling drying rate period. The calculated value of the moisture diffusivity varied from 1.7 × 10–10 to 1.15 × 10–9 m2/s for apricot fruit, and the value of activation energy ranged from 29.35 to 33.78 kJ/mol at different velocities of air.

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Skomski, R., R. D. Kirby, and D. J. Sellmyer. "Activation entropy, activation energy, and magnetic viscosity." Journal of Applied Physics 85, no. 8 (April 15, 1999): 5069–71. http://dx.doi.org/10.1063/1.370093.

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Chae, Heehong, and Jangwook Heo. "Evaluation of Environmental Characteristics in Reactor Cavity for Determination of PECS Activation Condition." Journal of Energy Engineering 32, no. 3 (September 30, 2023): 36–44. http://dx.doi.org/10.5855/energy.2023.32.3.036.

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6

Kharkats, Yu I., and L. I. Krishtalik. "Medium reorganization energy and enzymatic reaction activation energy." Journal of Theoretical Biology 112, no. 2 (January 1985): 221–49. http://dx.doi.org/10.1016/s0022-5193(85)80284-8.

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7

Cahoon, J. R., and Oleg D. Sherby. "The activation energy for lattice." Metallurgical Transactions A 23, no. 9 (September 1992): 2491–500. http://dx.doi.org/10.1007/bf02658053.

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8

Alkhayat, Rabee B., Hala Nazar Mohammed, and Yasir Yahya Kassim. "The Impact of Laser on the Activation Energy and Sensitivity of CR-39 Detector." NeuroQuantology 20, no. 2 (April 1, 2022): 113–18. http://dx.doi.org/10.14704/nq.2022.20.2.nq22077.

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The influence of laser radiation on bulk and etch rates, and as well detector sensitivity, before and after being irradiated with alpha particles at 5 MeV emitted from a 241Am source, are examined at different etching temperatures (65, 67, 69, 71, 73, 75, 77, 79 ,81, 83, and 85)C in this paper. A laser source with a wavelength of 480 nm and a pulse energy of 50 mJ/pulse at a repetition rate of 9 Hz was used to investigate the activation energy of a CR-39 polymer. The rates of bulk etch, Vb, and track etch, Vt, slightly increase with laser radiation. Whereas sensitivity decreases as temperature increases, besides, alpha-laser samples have quite better sensitivity than other samples. The activation energies of the bulk etch rates, Eb, are equivalent to 0.94 ± 0.07, 0.88 ± 0.05, and 0.95 ± 0.06 eV for laser-alpha, alpha-laser, and no laser samples, respectively. While, the activation energies associated with track etch rate, Et, for the CR-39 samples under study are 0.86 ± 0.04, 0.77 ± 0.03, and 0.76 ± 0.03 eV. The results manifest that laser exposure has a slight influence on activation energies of bulk etch rate within experimental uncertainties of the CR-39 samples. Additionally, the CR-39 set of laser-alpha samples reveals that Et is increased based on the cross-linking process. The increase in Et relates to hardening of the detector material, which has several uses, specifically in radiation detection.

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K. R. Patel, K. R. Patel, Dhara Patel, and Ashish patel. "Study of Activation Energy and Thermodynamic Parameters from TGA of Some Synthesized Metal Complexes." Indian Journal of Applied Research 3, no. 4 (October 1, 2011): 410–12. http://dx.doi.org/10.15373/2249555x/apr2013/135.

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10

Otero, Toribio F., and Juana Mª García de Otazo. "Polypyrrole oxidation: Kinetic coefficients, activation energy and conformational energy." Synthetic Metals 159, no. 7-8 (April 2009): 681–88. http://dx.doi.org/10.1016/j.synthmet.2008.12.017.

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11

Ishibashi, Yoshihiro, and Makoto Iwata. "Activation Energy of Ferroelectric Domain Wall." Journal of the Physical Society of Japan 89, no. 1 (January 15, 2020): 014705. http://dx.doi.org/10.7566/jpsj.89.014705.

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12

Miura, Daisuke, and Akimasa Sakuma. "Analytic expression for magnetic activation energy." Japanese Journal of Applied Physics 58, no. 5 (April 12, 2019): 058002. http://dx.doi.org/10.7567/1347-4065/aaffed.

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13

Singh, N. "Activation Energy of Hydrogen in Lu." Materials Science Forum 223-224 (July 1996): 147–50. http://dx.doi.org/10.4028/www.scientific.net/msf.223-224.147.

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14

Lin, Hong Yan, Chun Cai Wang, Cui Yan Yu, and Tao Xu. "Calculation of Nanowire Growth Activation Energy." Advanced Materials Research 512-515 (May 2012): 2064–67. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2064.

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Two-step preparation technology was used to prepare anodic aluminum oxide (AAO) templates. Then deposit Ni nanowire arrays in nanopores of AAO templates by direct current deposition. TEM spectra of nanowires show that the length of nanowires is uniform and that the shape of nanowires is the same with that of nanopores. Finally, reaction activation energy of Ni growing in nanopores was calculated by experimental data. Results show that Ni growing in the smaller nanopores is much easier than in the bigger nanopores.

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15

Reissner, M., R. Ambrosch, and W. Steiner. "Effective activation energy in high Tcsuperconductors." Superconductor Science and Technology 4, no. 1S (January 1, 1991): S436—S438. http://dx.doi.org/10.1088/0953-2048/4/1s/131.

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16

Reissner, M., D. Proschofsky-Spindler, I. Hušek, M. Kulich, and P. Kováč. "Activation Energy Distribution of MgB2 Wires." Physics Procedia 36 (2012): 1582–87. http://dx.doi.org/10.1016/j.phpro.2012.06.214.

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17

Kholmanskiy, Alexander. "Activation energy of water structural transitions." Journal of Molecular Structure 1089 (June 2015): 124–28. http://dx.doi.org/10.1016/j.molstruc.2015.02.049.

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18

Gaunt, P. "Magnetic viscosity and thermal activation energy." Journal of Applied Physics 59, no. 12 (June 15, 1986): 4129–32. http://dx.doi.org/10.1063/1.336671.

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19

Roesch, William J. "Compound semiconductor activation energy in humidity." Microelectronics Reliability 46, no. 8 (August 2006): 1238–46. http://dx.doi.org/10.1016/j.microrel.2006.02.006.

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20

Sundararaman, Padmanabhan, Paul H. Merz, and Roy G. Mann. "Determination of kerogen activation energy distribution." Energy & Fuels 6, no. 6 (November 1992): 793–803. http://dx.doi.org/10.1021/ef00036a015.

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21

Singh, N., and B. Kumar. "Activation energy of hydrogen in Lu." Pramana 48, no. 6 (June 1997): 1095–103. http://dx.doi.org/10.1007/bf02845884.

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22

Ditali, A., and W. Black. "Activation energy of thin SiO2 films." Electronics Letters 28, no. 21 (1992): 2014. http://dx.doi.org/10.1049/el:19921291.

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23

Nakamura, Takashi, Eunjoo Kim, Yoshitomo Uwamino, Yoshitomo Uno, and Noriaki Nakao. "High Energy Neutron Activation Cross Sections." Journal of Nuclear Science and Technology 39, sup2 (August 2002): 1392–95. http://dx.doi.org/10.1080/00223131.2002.10875365.

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24

Avramov, Isak. "Non-equilibrium viscosity and activation energy." Journal of Non-Crystalline Solids 355, no. 34-36 (September 2009): 1769–71. http://dx.doi.org/10.1016/j.jnoncrysol.2009.07.006.

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25

Saucedo-Castañeda, Gerardo, Maurice Raimbault, and Gustavo Viniegra-González. "Energy of activation in cassava silages." Journal of the Science of Food and Agriculture 53, no. 4 (1990): 559–62. http://dx.doi.org/10.1002/jsfa.2740530413.

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26

Moroshkina, Anastasia, Alina Ponomareva, Vladimir Mislavskii, Evgeniy Sereshchenko, Vladimir Gubernov, Viatcheslav Bykov, and Sergey Minaev. "Activation Energy of Hydrogen–Methane Mixtures." Fire 7, no. 2 (January 29, 2024): 42. http://dx.doi.org/10.3390/fire7020042.

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In this work, the overall activation energy of the combustion of lean hydrogen–methane–air mixtures (equivalence ratio φ = 0.7−1.0 and hydrogen fraction in methane α=0, 2, 4) is experimentally determined using thin-filament pyrometry of flames stabilised on a flat porous burner under normal conditions (p=1 bar, T = 20 °C). The experimental data are compared with numerical calculations within the detailed reaction mechanism GRI3.0 and both approaches confirm the linear correlation between mass flow rate and inverse flame temperature predicted in the theory. An analysis of the numerical and experimental data shows that, in the limit of lean hydrogen–methane–air mixtures, the activation energy approaches a constant value, which is not sensitive to the addition of hydrogen to methane. The mass flow rate for a freely propagating flame and, thus, the laminar burning velocity, are measured for mixtures with different hydrogen contents. This mass flow rate, scaled over the characteristic temperature dependence of the laminar burning velocity for a one-step reaction mechanism, is found and it can also be used in order to estimate the parameters of the overall reaction mechanisms. Such reaction mechanisms will find implementation in the numerical simulation of practical combustion devices with complex flows and geometries.

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27

Kublanovskii, Valeriy, and Vasyl Nikitenko. "DEPENDENCE ACTIVATION ENERGY OF THE ELECTROREDUCTION OF PALLADIUM(II) BIS-HYDROXYETHYLIMINODIACETATE COMPLEXES ON THE OVERPOTENTIAL." Ukrainian Chemistry Journal 85, no. 1 (February 15, 2019): 32–37. http://dx.doi.org/10.33609/0041-6045.85.1.2019.32-37.

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The kinetic (exchange currents, apparent elect-ron transfer coefficients) and energetic (activation energies of diffusion and electron-transfer reaction) parameters of electroreduction of palladium (II) bis-hydroxyethyliminodiacetate complexes from an ele-ctrolyte containing an excess of free ligand have been determined. A method is proposed for calculating the actual activation energy of the electrode process that is controlled by mixed kinetics, based on the dif-fusion activation energy, transition reaction and the ratio of surface and volume concentrations of potenti-al-determining ions in the solution under study or the ratio of the limiting diffusion current jd and dischar-ge current jk of palladium (II) hydroxyethyliminodi- acetate complexes. The actual activation energy Af of the electrode process, which is controlled by mixed kinetics, is calculated based on the diffusion activati-on energy, transition reaction and the ratio of the li-miting diffusion current jd and discharge current jk of palladium (II) bis-hydroxyethyliminodiacetate com-plexes. The contribution of the activation energy of the transition stage (slow discharge) and the diffusion activation energy of bis -hydroxyethyliminodiacetate palladium (II) complexes to the actual activation ener-gy of the electrode process limited by mixed kine-tics is determined. The dependence of actual activation energy on electrode process overpotential has been stu-died. The actual activation energy Af of the electro-de process varies from the value of the activation ener-gy of the transition reaction At (63.4 kJ×mol–1) to the value of the diffusion activation energy Ad (22.5 kJ ×mol–1). The activation energy calculated according to Tyomkin can be considered as the actual activation energy Af of the discharge stage at a given polarizati-on DE only with a purely kinetic control of the pro-cess rate. The activation energy experimentally deter-mined by the temperature-kinetic method according to the Arrhenius equation and calculated by the pro-posed method is the actual activation energy Af of the electrode process, controlled by mixed kinetics. There is a coincidence of the experimentally determi-ned by the Gorbachev method and the actual Af acti-vation energy of electrode process controlled by mi-xed kinetics calculated by the proposed method. A good agreement between the calculated and experi-mentally determined values of the actual activation energy of the electrode process is observed.

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28

Shchurin, K. V., and I. G. Panin. "To change the properties of magnetic fluids in an alternating magnetic field." Informacionno-technologicheskij vestnik 11, no. 1 (March 30, 2017): 103–14. http://dx.doi.org/10.21499/2409-1650-2017-1-103-114.

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Provides an overview of magnetic fluids and their external activation methods weak energy impacts. Considered the physical basis of magnetic fuel activation with a view to change their molecular and nadmolekuljarnyh structures. A new design of magnetic liquid Activator Wednesday with a high rate of utilization of capacity. Shows comparative testing fuels combustion engine, resulting in significant increase recorded their energy and environmental performance after magnetic fuel activation. Considered a prerequisite applying magnetic rocket fuels activation.

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29

Lai, Quang Tuan, Trinh Hai Son, Thi Minh Ngoc Nguyen, Sanggyu Lee, Danish Khan Mohd, and Ji Whan Ahn. "Carbon Mineralization Integrated Alkali Activation for Eco-Friendly Enrichment of Rare Earth Elements from Circulating Fluidized Bed Fly Ash." Journal of Energy Engineering 31, no. 1 (March 31, 2022): 72–82. http://dx.doi.org/10.5855/energy.2022.31.1.072.

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30

Arieta, FG, and CM Sellars. "Activation volume and activation energy for deformation of Nb HSLA steels." Scripta Metallurgica et Materialia 30, no. 6 (March 1994): 707–12. http://dx.doi.org/10.1016/0956-716x(94)90186-4.

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31

Joseph, Shiju, Siva Uppalapati, and Ozlem Cizer. "Instantaneous activation energy of alkali activated materials." RILEM Technical Letters 3 (March 12, 2019): 121–23. http://dx.doi.org/10.21809/rilemtechlett.2018.78.

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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 equation based on the activation energy. While apparent activation energy is calculated from parallel isothermal calorimetry measurements at different temperatures, instantaneous activation energy is typically measured using a differential scanning calorimeter. Compared to the apparent activation energy, instantaneous activation energy has minimal effects on the microstructural changes due to the variation in temperature. In this work, the evolution of activation energy was determined by traditional methods and was compared with the instantaneous activation energy. It was found that while the activation energy changed with the progress of reaction over traditional methods, the instantaneous activation energy did not show any changes / or remained the same. The instantaneous activation energy was also found to be higher compared to the apparent activation energy determined with traditional methods.

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32

Salahuddin, T., Nazim Siddique, Maryam Arshad, and I. Tlili. "Internal energy change and activation energy effects on Casson fluid." AIP Advances 10, no. 2 (February 1, 2020): 025009. http://dx.doi.org/10.1063/1.5140349.

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33

Jiang, Heming, and Tian-Yu Sun. "The Activating Effect of Strong Acid for Pd-Catalyzed Directed C–H Activation by Concerted Metalation-Deprotonation Mechanism." Molecules 26, no. 13 (July 4, 2021): 4083. http://dx.doi.org/10.3390/molecules26134083.

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A computational study on the origin of the activating effect for Pd-catalyzed directed C–H activation by the concerted metalation-deprotonation (CMD) mechanism is conducted. DFT calculations indicate that strong acids can make Pd catalysts coordinate with directing groups (DGs) of the substrates more strongly and lower the C–H activation energy barrier. For the CMD mechanism, the electrophilicity of the Pd center and the basicity of the corresponding acid ligand for deprotonating the C–H bond are vital to the overall C–H activation energy barrier. Furthermore, this rule might disclose the role of some additives for C–H activation.

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34

Dhaundiyal, Alok, and Suraj B. Singh. "STUDY OF DISTRIBUTED ACTIVATION ENERGY MODEL USING VARIOUS PROBABILITY DISTRIBUTION FUNCTIONS FOR THE ISOTHERMAL PYROLYSIS PROBLEM." Rudarsko-geološko-naftni zbornik 32, no. 4 (October 11, 2017): 1–14. http://dx.doi.org/10.17794/rgn.2017.4.1.

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35

Fischer, U., S. Simakov, U. v. Möllendorff, P. Pereslavtsev, and P. Wilson. "Validation of activation calculations using the Intermediate Energy Activation File IEAF-2001." Fusion Engineering and Design 69, no. 1-4 (September 2003): 485–89. http://dx.doi.org/10.1016/s0920-3796(03)00113-3.

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36

Kötting, Carsten, and Klaus Gerwert. "Time-resolved FTIR studies provide activation free energy, activation enthalpy and activation entropy for GTPase reactions." Chemical Physics 307, no. 2-3 (December 2004): 227–32. http://dx.doi.org/10.1016/j.chemphys.2004.06.051.

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37

Koiwa, Masahiro. "An Essay on “Arrhenius and Activation Energy”." Materia Japan 39, no. 1 (2000): 58–62. http://dx.doi.org/10.2320/materia.39.58.

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38

Borbón-Nuñez, Hugo A., and Claudio Furetta. "Activation Energy of Modified Peak Shape Equations." World Journal of Nuclear Science and Technology 07, no. 04 (2017): 274–83. http://dx.doi.org/10.4236/wjnst.2017.74021.

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39

Carvalho, M. A., and Ana M. Segadães. "Moisture Expansion: Activation Energy versus Firing Temperature." Key Engineering Materials 264-268 (May 2004): 1581–84. http://dx.doi.org/10.4028/www.scientific.net/kem.264-268.1581.

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40

Korovin, Yu A., A. A. Natalenko, A. Yu Konobeyev, A. Yu Stankovskiy, and S. G. Mashinik. "High Energy Activation Data Library (HEAD-2009)." Journal of the Korean Physical Society 59, no. 2(3) (August 12, 2011): 1080–83. http://dx.doi.org/10.3938/jkps.59.1080.

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41

Titov, D. D., A. S. Lysenkov, Yu F. Kargin, M. G. Frolova, V. A. Gorshkov, and S. N. Perevislov. "Sintering activation energy MoSi2-WSi2-Si3N4 ceramic." IOP Conference Series: Materials Science and Engineering 347 (April 2018): 012024. http://dx.doi.org/10.1088/1757-899x/347/1/012024.

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42

Xu, Gui Ying, Jiang Bo Wang, Ling Ping Guo, and Guo Gang Sun. "Decomposition Kinetics of Switchgrass: Estimating Activation Energy." Advanced Materials Research 881-883 (January 2014): 726–33. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.726.

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TG analysis was used to investigate the thermal decomposition of switchgrass, which is a potential gasification feedstock. 10 mg switchgrass sample with the particles between 0.45 and 0.70 mm was linearly heated to 873 K at heating rates of 10, 20, 30 K/min, respectively, under high-purity nitrogen. The Kissinger method and three isoconversional methods including Friedman, Flynn-wall-Ozawa, Vyazovkin and Lenikeocink methods were used to estimate the apparent activation energy of switchgrass. With the three isoconversional methods, it can be concluded that the activation energy increases with increasing conversion. The four model free methods reveal activation energies in the range of 70-460 kJ/mol. These activation energy values provide the basic data for the thermo-chemical utilization of the switchgrass.

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43

Pachulia, Z. V. "The issue of calculation of activation energy." Journal of Biological Physics and Chemistry 18, no. 2 (June 30, 2018): 106–10. http://dx.doi.org/10.4024/05pa18l.jbpc.18.02.

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44

Smith, Jonathan M., Matthew Nikow, Jianqiang Ma, Michael J. Wilhelm, Yong-Chang Han, Amit R. Sharma, Joel M. Bowman, and Hai-Lung Dai. "Chemical Activation through Super Energy Transfer Collisions." Journal of the American Chemical Society 136, no. 5 (January 23, 2014): 1682–85. http://dx.doi.org/10.1021/ja4126966.

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45

Wee, S. F., M. K. Chai, K. P. Homewood, and W. P. Gillin. "The activation energy for GaAs/AlGaAs interdiffusion." Journal of Applied Physics 82, no. 10 (November 15, 1997): 4842–46. http://dx.doi.org/10.1063/1.366345.

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46

Park, C. W., and R. W. Vook. "Activation energy for electromigration in Cu films." Applied Physics Letters 59, no. 2 (July 8, 1991): 175–77. http://dx.doi.org/10.1063/1.106011.

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47

Tsang, W. T., E. F. Schubert, and J. E. Cunningham. "Doping in semiconductors with variable activation energy." Applied Physics Letters 60, no. 1 (January 6, 1992): 115–17. http://dx.doi.org/10.1063/1.107365.

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48

Schultz, Peter J., T. D. Thompson, and R. G. Elliman. "Activation energy for the photoluminescenceWcenter in silicon." Applied Physics Letters 60, no. 1 (January 6, 1992): 59–61. http://dx.doi.org/10.1063/1.107373.

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49

Jin, X., X. N. Xu, J. S. Zhu, H. L. Ji, G. J. Shen, Y. T. Zhang, S. Y. Ding, and X. X. Yao. "Oxygen concentration and activation energy in YBa2Cu3Ox." Superconductor Science and Technology 5, no. 1S (January 1, 1992): S244—S247. http://dx.doi.org/10.1088/0953-2048/5/1s/054.

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50

Cannelli, G., R. Cantelli, F. Cordero, F. Trequattrini, and M. Ferretti. "Low-Activation Energy Relaxations in Oxide Superconductors." Le Journal de Physique IV 06, no. C8 (December 1996): C8–469—C8–472. http://dx.doi.org/10.1051/jp4:19968101.

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Journal articles on the topic 'Activation energy'

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