Modelling kinetics of dynamic recrystallisation: introducing new characteristic parameters

Stretched Exponential ◽

Kinetics Of ◽

Hole Diffusion Length

AbstractConcomitant studies of kinetics of defects ND(t), photoconductivity σph(t), electron and hole diffision lengths Le(t), Lh(t) during light soaking have been carried out. The data have been fitted by stretched exponential expressions and characteristic parameters of kinetics have been determined. Correlation between the kinetics is discussed. In contrast to Nd(t), σph(t) and Le(t), the hole diffusion length Lh(t) was observed to remain constant during initial time (˜ 103s) and then decreased with characteri stic time ˜ 104s.

Quantification of characteristic parameters for the dissociation kinetics of iron–boron pairs in Czochralski silicon

Scripta Materialia ◽

10.1016/j.scriptamat.2010.10.021 ◽

2011 ◽

Vol 64 (3) ◽

pp. 217-220 ◽

Cited By ~ 6

Author(s):

Xiaodong Zhu ◽

Xuegong Yu ◽

Xiaoqiang Li ◽

Peng Wang ◽

Deren Yang

Keyword(s):

Dissociation Kinetics ◽

Czochralski Silicon ◽

Modeling kraft cooking kinetics of fiber mixes from TMP and unbleached kraft pulps for assessment of old corrugated cardboard delignification

Holzforschung ◽

10.1515/hf-2017-0197 ◽

2018 ◽

Vol 72 (8) ◽

pp. 621-629

Author(s):

Lucas Dollié ◽

Gérard Mortha ◽

Nathalie Marlin

Keyword(s):

Kraft Pulp ◽

Kraft Pulping ◽

Thermomechanical Pulp ◽

Kraft Pulps ◽

High Quality ◽

Lignocellulosic Substrates ◽

Kraft Cooking ◽

Corrugated Cardboard ◽

AbstractKraft cooking kinetics of three different lignocellulosic substrates have been investigated, namely fibers from unbleached kraft pulp (UBKP from Pinus radiata), fibers from softwood unbleached thermomechanical pulp (TMP), and wood chips for TMP production. UBKP and TMP were considered to be representative of a fiber mixture obtained after the pulping and cleaning of old corrugated cardboards (OCC). The characteristic parameters for fitting a mathematical model for kraft pulping were estimated. Based on the results, a “fiber mixture cooking model” was developed to predict the cooking kinetics of TMP/UBKP mixes, accounting for the proportion of each component. The aim was to tailor OCC upcycling in terms of high quality products, which can be used for various purposes including paper and non-paper applications.

Dynamic recrystallisation kinetics of GCr15 bearing steel

Materials Research Innovations ◽

10.1179/143307508x362864 ◽

2008 ◽

Vol 12 (4) ◽

pp. 213-216 ◽

Cited By ~ 3

Author(s):

C. X. Yue ◽

L. W. Zhang ◽

S. L. Liao ◽

J. B. Pei ◽

H. J. Gao ◽

...

Keyword(s):

Bearing Steel ◽

Gcr15 Bearing Steel ◽

Dynamic Recrystallisation ◽

High temperature sintering kinetics of a-Al2o3 powder

Science of Sintering ◽

10.2298/sos0302099i ◽

2003 ◽

Vol 35 (2) ◽

pp. 99-102 ◽

Cited By ~ 1

Author(s):

M.R. Ivanovic ◽

M. Nenezic ◽

Vukoman Jokanovic

Keyword(s):

High Temperature ◽

Theoretical Density ◽

Al2o3 Powder ◽

Sintering Kinetics ◽

The sintering kinetics of a-Al2O3 powder is investigated in this paper Commercial a-Al2O3 powdered compacts were sintered close to 95 % of the theoretical density. The characteristic parameters of sintering kinetics were also determined.

Kinetic Analysis of the Transformation from 14M Martensite to L21 Austenite in Ni-Fe-Ga Melt Spun Ribbons

Metals ◽

10.3390/met11060849 ◽

2021 ◽

Vol 11 (6) ◽

pp. 849

Author(s):

Alejandro F. Manchón-Gordón ◽

Raúl López-Martín ◽

Jhon J. Ipus ◽

Javier S. Blázquez ◽

Peter Svec ◽

...

Keyword(s):

Melt Spinning ◽

Room Temperature ◽

Solidification Process ◽

Austenite Phase ◽

Isothermal Kinetics ◽

Martensitic Transition ◽

First Order ◽

Kinetics Of ◽

Good Agreement

In this study, the non-isothermal kinetics of the martensitic transition from 14M modulated martensite to austenite phase in Ni55Fe19Ga26 ribbons obtained by melt-spinning has been analyzed. The proximity of the martensitic transition to room temperature makes it very sensitive to pressure and subtle differences for different pieces of the ribbon (ascribed to stresses stored in the ribbon during its rapid solidification process). Despite the dispersion in the characteristic parameters of the transition, a general behavior is observed with a decreasing activation energy as the heating rate increases due to the nucleation driven character of the transition. It has been shown that a first-order autocatalysis can describe the temperature evolution of the austenite fraction using only two experimental temperatures. Predicted curves are in good agreement with experimental data.

Energy storage in the photosynthetic electron-transport chain: An analogy with Michaelis-Menten kinetics

Journal of the Serbian Chemical Society ◽

10.2298/jsc0309615m ◽

2003 ◽

Vol 68 (8-9) ◽

pp. 615-628 ◽

Cited By ~ 2

Author(s):

Dejan Markovic

Keyword(s):

Energy Storage ◽

Thermal Emission ◽

Photosynthetic Apparatus ◽

Photosynthetic Electron Transport ◽

Initial Response ◽

Enzymatic Reactions ◽

Photosynthetic Electron Transport Chain ◽

Transport Chain ◽

Simultaneous measurements of fluorescence and thermal emission have been performed by applying combined fluorescence and photoacoustic techniques on isolated thylakoids pretreated by prolonged illumination with saturating light. The traces were used to create Lineweaver-Burk type plots, proving clearly at least a formal analogy between the kinetics of the mechanisms governing fluorescence and thermal emission from isolated thylakoids and Michaelis-Menten kinetics of enzymatic reactions. Two characteristic parameters were calculated from them (energy storage and half-saturation light intensity) in order to obtain a basic, initial response of the photosynthetic apparatus functioning under photoinhibition stress.

Siphon Flows in Stratified Coronal Loops

International Astronomical Union Colloquium ◽

10.1017/s0252921100025288 ◽

1994 ◽

Vol 144 ◽

pp. 185-187

Author(s):

S. Orlando ◽

G. Peres ◽

S. Serio

Keyword(s):

Heat Flux ◽

Scaling Laws ◽

Flow Model ◽

Supersonic Flows ◽

Coronal Loops ◽

Characteristic Parameters

AbstractWe have developed a detailed siphon flow model for coronal loops. We find scaling laws relating the characteristic parameters of the loop, explore systematically the space of solutions and show that supersonic flows are impossible for realistic values of heat flux at the base of the upflowing leg.

Direct observations of radiation-enhanced transformations in glass

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100075543 ◽

1983 ◽

Vol 41 ◽

pp. 354-355

Author(s):

J. F. DeNatale ◽

D. G. Howitt

Keyword(s):

Glass Matrix ◽

Diffusion Mechanism ◽

Bubble Formation ◽

Silicate Glasses ◽

Phase Decomposition ◽

Direct Observations ◽

Thin Foils ◽

Oxygen Bubble ◽

Electron Energy Loss ◽

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Irradiation behavior of pyrolytic silicon carbide

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074288 ◽

1983 ◽

Vol 41 ◽

pp. 72-73

Author(s):

R. J. Lauf

Keyword(s):

Silicon Carbide ◽

Fission Products ◽

Thermodynamics And Kinetics ◽

Neutron Fluences ◽

Fuel Particles ◽

Sic Coatings ◽

Irradiation Behavior ◽

Kinetics Of ◽

Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.