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R. A. G. Silva A. T. Adorno A. G. Magdalena T. M. Carvalho M. Stipcich A. Cuniberti M. L. Castro 《Journal of Thermal Analysis and Calorimetry》2011,103(2):459-463
In this study the effect of Ag additions on the thermal behavior of the Cu–22.55 at.%Al alloy was studied using electrical
resistivity measurements, in situ X-ray diffractometry, differential scanning calorimetry, and optical microscopy. The results
indicated that Ag additions do not change the phase transformations sequence in the studied alloys, but modify its critical
temperatures due to a change on entropy of system. It was verified that at the cooling rate of 10 K/min the decomposition
of β phase into (α + γ1) is incomplete, but for lower cooling rates than 1.0 K/min this reaction is completed. 相似文献
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Nicola Pizzolato Davide Valenti Dominique Persano Adorno Bernardo Spagnolo 《Central European Journal of Physics》2009,7(3):541-548
The evolutionary dynamics of a system of cancerous cells in a model of chronic myeloid leukemia (CML) is investigated by a
statistical approach. Cancer progression is explored by applying a Monte Carlo method to simulate the stochastic behavior
of cell reproduction and death in a population of blood cells which can experience genetic mutations. In CML front line therapy
is represented by the tyrosine kinase inhibitor imatinib which strongly affects the reproduction of leukemic cells only. In
this work, we analyze the effects of a targeted therapy on the evolutionary dynamics of normal, first-mutant and cancerous
cell populations. Several scenarios of the evolutionary dynamics of imatinib-treated leukemic cells are described as a consequence
of the efficacy of the different modelled therapies. We show how the patient response to the therapy changes when a high value
of the mutation rate from healthy to cancerous cells is present. Our results are in agreement with clinical observations.
Unfortunately, development of resistance to imatinib is observed in a fraction of patients, whose blood cells are characterized
by an increasing number of genetic alterations. We find that the occurrence of resistance to the therapy can be related to
a progressive increase of deleterious mutations.
相似文献
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T. M. Carvalho R. A. G. Silva A. T. Adorno A. G. Magdalena 《Journal of Thermal Analysis and Calorimetry》2009,97(1):53-56
The Ag-rich phase precipitation in the Cu-9 mass% Al was studied using differential scanning calorimetry (DSC), X-ray diffractometry
(XRD) and scanning electron microscopy (SEM). The results indicated that Ag additions did not interfere on the metastable
transitions sequence of the Cu-mass% Al alloy but Ag precipitation disturbs the β phase formation reaction and the martensitic
phase decomposition reaction. 相似文献
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T. C. Adorno D. M. Gitman A. E. Shabad 《The European Physical Journal C - Particles and Fields》2014,74(4):1-17
We show, within QED and other possible nonlinear theories, that a static charge localized in a finite domain of space becomes a magnetic dipole, if it is placed in an external (constant and homogeneous) magnetic field in the vacuum. The magnetic moment is quadratic in the charge, depends on its size and is parallel to the external field, provided the charge distribution is at least cylindrically symmetric. This magneto-electric effect is a nonlinear response of the magnetized vacuum to an applied electrostatic field. Referring to the simple example of a spherically symmetric applied field, the nonlinearly induced current and its magnetic field are found explicitly throughout the space; the pattern of the lines of force is depicted, both inside and outside the charge, which resembles that of a standard solenoid of classical magnetostatics. 相似文献
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Tiago C. Adorno Alexander I. Breev Antonio J. D. Farias Jr. Dmitri M. Gitman 《Annalen der Physik》2023,535(7):2300118
The problem of the electromagnetic radiation produced by charge distributions in the framework of a semiclassical approach proposed in the work by Bagrov, Gitman, Shishmarev, and Farias Jr. [J. Synchrotron Rad. 27 , 902–911 (2020)] is addressed here. In this approach, currents, generating the radiation are considered classically, while the quantum nature of the radiation is kept exactly. Quantum states of the electromagnetic field are solutions of Schrödinger's equation, and relevant quantities to the problem are evaluated with the aid of transition probabilities. This construction allows us to introduce the quantum transition time in physical quantities and assess its role in radiation problems by classical currents. Radiated electromagnetic energies are studied in detail and a definition for the rate at which radiation is emitted from sources is presented. In calculating the total energy and rate radiated by a pointlike charged particle accelerated by a constant and uniform electric field, it is discovered that these results are compatible with results obtained by other authors in the framework of the classical radiation theory under an appropriate limit. Numerical and asymptotic analyses of the results are also performed. 相似文献
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A. G. Magdalena A. T. Adorno R. A. G. Silva T. M. Carvalho 《Journal of Thermal Analysis and Calorimetry》2009,97(1):47-51
In this work the effect of Ag concentration on the thermal behavior of the Cu-10 mass% Al and Cu-11 mass% Al alloys with additions
of 4, 6, 8 and 10 mass% Ag was studied using differential scanning calorimetry (DSC), in situ X-ray diffractometry (XRD) and
scanning electron microscopy (SEM). The results showed that for the Cu-10 mass% Al alloy Ag addition induce the β′1 phase formation and for the Cu-11 mass% Al alloy these additions increase the amount of martensite formed on quenching and
decrease the stability range of this phase on heating. 相似文献
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T. M. Carvalho A. T. Adorno A. G. Magdalena R. A. G. Silva 《Journal of Thermal Analysis and Calorimetry》2011,106(2):333-338
The eutectoid transformation may be defined as a solid-state diffusion-controlled decomposition process of a high-temperature
phase into a two-phase lamellar aggregate behind a migrating boundary on cooling below the eutectoid temperature. In substitutional
solid solutions, the eutectoid reaction involves diffusion of the solute atoms either through the matrix or along the boundaries
or ledges. The effect of Ag on the non-isothermal kinetics of the reverse eutectoid reaction in the Cu–9 mass%Al, Cu–10 mass%Al,
and Cu–11 mass%Al alloys were studied using differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning
electron microscopy (SEM). The activation energy for this reaction was obtained using the Kissinger and Ozawa methods. The
results indicated that Ag additions to Cu–Al alloys interfere on the reverse eutectoid reaction, increasing the activation
energy values for the Cu–9 mass%Al and Cu–10 mass%Al alloys and decreasing these values for the Cu–11 mass%Al alloy for additions
up to 6 mass%Ag. The changes in the activation energy were attributed to changes in the reaction solute and in Ag solubility
due to the increase in Al content. 相似文献