MODELS OF THE G = 2.0006 ESR SIGNAL GROWTH CURVE IN CARBONATES

Date

1993-01-01

Author

CETIN, O
WIESER, A
WALTHER, R
OZER, AM
FILL, U
REGULLA, DF

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

47
views

0
downloads

Several mathematical equations for describing the growth curve of modern and fossil carbonate samples are discussed. The best approximation for the dose response of the g = 2.0006 ESR dating signal in aragonitic coral and shell samples was found by a combination of three single exponential saturation functions. Also the isothermal decay curves of the ESR signal proved to be best fitted by the combination of three first order decay functions. The lifetimes of the three components were obtained from an Arrhenius plot. For different species of mollusc shells the lifetime of the less stable component was found in the range 30-90 ka at 2-degrees-C. It can be removed by heating the samples at 180-degrees-C for a period of 2 h.

URI

https://hdl.handle.net/11511/68361

Journal

RADIATION PROTECTION DOSIMETRY

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Analysis of the electrofiltration mechanism based on multiphase filtration theory Genc, A; Tosun, I (Informa UK Limited, 2004-01-01) A mathematical model based on multiphase filtration theory is developed to describe the electrofiltration process. The model takes both electrophoretic and electroosmotic effects into account. The electrophoretic migration velocity of solid particles is predicted from the model using the filtrate volume time data obtained from electrofiltration experiments.
A robust algorithm for configurational-force-driven brittle crack propagation with R-adaptive mesh alignment MIEHE, CHRISTIAN; Gürses, Ercan (2007-10-08) The paper considers a variational formulation of brittle fracture in elastic solids and proposes a numerical implementation by a finite element method. On the theoretical side, we outline a consistent thermodynamic framework for crack propagation in an elastic solid. It is shown that both the elastic equilibrium response as well as the local crack evolution follow in a natural format by exploitation of a global Clausius-Planck inequality in the sense of Coleman's method. Here, the canonical direction of the...
MODELING OF EVAPORATION FROM A SESSILE CONSTANT SHAPE DROPLET Akkus, Yigit; ÇETİN, BARBAROS; Dursunkaya, Zafer (2017-08-30) In this study, a computational model for the evaporation from a sessile liquid droplet fed from the center to keep the diameter of the droplet constant is presented. The continuity, momentum and energy equations are solved with temperature dependent thenno-physical properties using COMSOL Multi-physics. At the surface of the droplet, convective heat and evaporative mass fluxes are assigned. Since the flow field is affected by evaporative flux, an iterative scheme is built and the computation is automated us...
A computational framework of configurational-force-driven brittle fracture based on incremental energy minimization MIEHE, CHRISTIAN; Gürses, Ercan; BIRKLE, MANUEL (Springer Science and Business Media LLC, 2007-06-01) A variational formulation of quasi-static brittle fracture in elastic solids at small strains is proposed and an associated finite element implementation is presented. On the theoretical side, a consistent thermodynamic framework for brittle crack propagation is outlined. It is shown that both the elastic equilibrium response as well as the local crack evolution follow in a natural format by exploitation of a global Clausius-Planck inequality. Here, the canonical direction of the crack propagation associate...
A new instrumental setup for determination of small amplitude viscoelastic properties of dough during fermentation Mert, Behiç (Springer Science and Business Media LLC, 2008-05-01) In this study, the working principles and the theoretical background of a new method to measure the viscoelastic properties of dough in the fermentation process are presented. During measurements, the dough sample was placed between a stationary bottom plate and an oscillating top plate and squeezed at random frequencies ranging from 10 to 100,000 rad/s. By measuring the required force and velocity of oscillations, the mechanical impedance of the samples, defined as the ratio of the force to oscillation vel...

Citation Formats

O. CETIN, A. WIESER, R. WALTHER, A. OZER, U. FILL, and D. REGULLA, “MODELS OF THE G = 2.0006 ESR SIGNAL GROWTH CURVE IN CARBONATES,” RADIATION PROTECTION DOSIMETRY, pp. 675–678, 1993, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68361.