共查询到20条相似文献,搜索用时 312 毫秒
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In this paper, by introducing an entropy of Markov evolution algebras, we treat the isomorphism of S-evolution algebras. A family of Markov evolution algebras is defined through the Hadamard product of structural matrices of non-negative real S-evolution algebras, and their isomorphism is studied by means of their entropy. Furthermore, the isomorphism of S-evolution algebras is treated using the concept of relative entropy. 相似文献
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Ronald J. Adler Alexander S. Silbergleit 《International Journal of Theoretical Physics》2000,39(5):1291-1316
We review the derivation of the metric for a spinning body of any shape andcomposition using linearized general relativity theory (LGRT), and also obtainthe same metric using a transformation argument. The latter derivation makes itclear that the linearized metric contains only the Eddington and parameters,so no new parameter is involved in frame-dragging or Lense—Thirring effects.We then calculate the precession of an orbiting gyroscope in a general weakgravitational field described by a Newtonian potential (the gravitoelectric field)and a vector potential (the gravitomagnetic field). Next we make a multipoleanalysis of the potentials and the precession equations, giving all of these interms of the spherical harmonics moments of the density distribution. The analysisis not limited to an axially symmetric source, although the Earth, which is themain application, is very nearly axisymmetric. Finally, we analyze the precessionin regard to the Gravity Probe B (GP-B) experiment, and find that the effect ofthe Earth's quadrupole moment (J
2) on the geodetic precession is large enoughto be measured by GP-B (a previously known result), but the effect on theLense—Thirring precession is somewhat beyond the expected GP-B accuracy. 相似文献
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Z. Papp 《Few-Body Systems》1999,26(1):99-103
The treatment of confining interactions in non-relativistic three-quark systems is addressed. Usually in the Faddeev equations
the Faddeev components are coupled by the total potential. In the new treatment proposed here the Faddeev components are coupled
only by the non-confining short-range part of the potential, thus allowing its channel-by-channel investigation. The convergence
in angular-momentum channels is much faster.
Received August 28, 1998; accepted for publication October 16, 1998 相似文献
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Since Mandelbrot (1963) [2] highlighted the fact that data on the yield of financial assets exhibit leptokurtosis, different distributions have been presented as alternatives to the normal distribution. So far little consideration has been given to the capacity that these distributions have to recover the kurtosis of the sample data. Our work aims to present distributions which, given the broad range of their kurtosis, have the capacity to perform adjustment on many occasions where other distributions fail, while also being capable of recovering the peakedness of the empirical data. Another key characteristic of these distributions is that they are defined within a bounded domain in the same way as the sample data. An empirical application of these distributions is presented within the financial field by using daily returns. 相似文献
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A. Pavlík M. Semelová J. John K. Černochová F. Šebesta 《Czechoslovak Journal of Physics》2006,56(1):D673-D680
This study deals with potential treatment of spent NTA-containing decontamination solutions for final disposal. The method
proposed is based on the degradation of organic substances followed by the separation of radionuclides. The influence of various
parameters (pH value, irradiation time, temperature, catalyst amount, type and various combinations of catalysts) on photocatalytic
degradation of NTA has been studied. Photo-Fenton reagent (Fe3+/H2O2) as a homogenous catalyst was found to be much more efficient than the TiO2-based heterogeneous catalyst Degussa P25. Under optimum conditions NTA in a simulant of a spent decontamination solution
without or with hydrazine could be degraded within 5 or 9 hours, respectively. The study of sorption properties of a series
of absorbers revealed that radiostrontium and radiosilver can be effectively removed from the simulant of a spent decontamination
solution even in the presence of NTA, while total NTA degradation is necessary for effective radiocobalt separation. 相似文献
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Mini Ghosh 《advances in applied mathematics and mechanics.》2013,5(6):857-871
This paper proposes a Susceptible-Infective-Susceptible (SIS)
model to study the malaria transmission with treatment by considering logistic
growth of mosquito population. In this work, it is assumed that the treatment
rate is proportional to the number of infectives below the capacity and is
constant when the number of infectives is greater than the capacity. We find
that the system exhibits backward bifurcation if the capacity is small and it
gives bi-stable equilibria which makes the system more sensitive to the initial
conditions. The existence and stability of the equilibria of the model are
discussed in detail and numerical simulations are presented to illustrate the numerical results. 相似文献
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Gyngazov S. A. Ryabchikov A. I. Kostenko V. Sivin D. O. 《Russian Physics Journal》2018,61(8):1513-1519
Russian Physics Journal - The paper presents the radiation and thermal treatment of zirconium ceramics with high-energy Al ion beams generated at an accelerating voltage of 1.5 kV, which modifies... 相似文献
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Reem Ahmad Giuseppe Schettino Gary Royle Miriam Barry Quentin A. Pankhurst Olivier Tillement Ben Russell Kate Ricketts 《Particle & Particle Systems Characterization》2020,37(4):1900411
Materials with a high atomic number (Z) are shown to cause an increase in the level of cell kill by ionizing radiation when introduced into tumor cells. This study uses in vitro experiments to investigate the differences in radiosensitization between two cell lines (MCF-7 and U87) and three commercially available nanoparticles (gold, gadolinium, and iron oxide) irradiated by 6 MV X-rays. To assess cell survival, clonogenic assays are carried out for all variables considered, with a concentration of 0.5 mg mL−1 for each nanoparticle material used. This study demonstrates differences in cell survival between nanoparticles and cell line. U87 shows the greatest enhancement with gadolinium nanoparticles (2.02 ± 0.36), whereas MCF-7 cells have higher enhancement with gold nanoparticles (1.74 ± 0.08). Mass spectrometry, however, shows highest elemental uptake with iron oxide and U87 cells with 4.95 ± 0.82 pg of iron oxide per cell. A complex relationship between cellular elemental uptake is demonstrated, highlighting an inverse correlation with the enhancement, but a positive relation with DNA damage when comparing the same nanoparticle between the two cell lines. 相似文献
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We discuss the problem of treating strongly correlated electrons by quantum chemical methods. It is shown how an incremental computational scheme for the ground-state energy can be related to a generalization of Faddeev's equations. We also discuss the application of the local increment method to lithium metal by the study of a Li8 cluster. 相似文献
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A new form of zero-discord state via Petz’s monotonicity condition on relative entropy with equality has been derived systematically. A generalization of symmetric zero-discord states is presented and the related physical implications are discussed. 相似文献
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We report heat treatment of the photonic crystal fiber. As the temperature was increased, the transmission of the photonic crystal fiber was increased, unlike conventional single mode fiber. The transmission increase at short wavelength region was larger than long wavelength region for the various temperatures. After crystallization of the silica glass, the spectra of the photonic crystal fiber were just decreased at all wavelength regions, but, in case of the single mode fiber, the absorption in visible region around 450 nm increased with increasing temperature. 相似文献
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References: 《理论物理通讯》2007,47(2):303-308
The level density parameter and the back shift energy E1 are determined for nuclei with A-values across the whole periodic table from fits to complete level schemes at low excitation energy near the neutron binding energies.We find that the energy back shift E1 shows complicated behavior and depends on the type of the nucleus,even-even,odd mass,and odd-odd.The spin cut-off factor has also been investigated for nuclei mentioned above.The results arecompared with the previous results and different experimental data on level densities. 相似文献
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The average kinetic energy and its variance of fission fragments for the compound nucleus 213At are calculated by four-dimensional Langevin equation. Two collective coordinates are taken into account: the distance p between the centers of the nascent fragments and the neck parameter h using the {c, h, a} parametrization. The model allows for a realistic coordinate dependence of all coeficien ts appearing in the Langevin equation as computed by the Werner-Wheeler method. The diffusion process for thc fissioning nuclear system from the ground state to the scission line on the realistic energy surface is investigated. The results are in good agreement with the experiments. 相似文献