L. Zadorozhna, A. Tugay, Nadiia Pulatova, Oleh Maluy
We present the results of a systematic analysis of the XMM-Newton spectra of nearby optically bright QSOs. The objects have been selected from X-ray Galaxy Catalog Xgal20. It is a catalog of 1172 manually identi(cid:28)ed and classi(cid:28)ed galaxies, obtained as a cross-correlation between the 4XMM-DR9 catalog and the Hyper-Linked Extragalactic Databases and Archives (HyperLeda) with an X-ray (cid:29)ux greater than F ≥ 10 − 13 erg / ( cm 2 · s ) . The goal of this work is to characterize the X-ray spectral properties of selected QSOs in the 0.1 (cid:21) 10 keV energy band. The majority of the sources (6 out of 11) are classi(cid:28)ed as radio-quiet QSOs. We studied optical spectra, hardness ratios and performed X-ray spectral (cid:28)ts for the 10 brighter sources. In most cases, the power law model with absorption is good enough to simulate observed continua. However, the details of the spectrum in some sources signi(cid:28)cantly complicate the model for (cid:28)tting. The majority of sources have steep spectra Γ > 2 . 1 . Extremely steep photon index ( ∼ 2 . 4 − 2 . 5 ) in our sample occurs for three radio-loud type I quasars. We detected Fe K α line for two radio-loud type II quasars. We (cid:28)nd no strong evidence for spectral hardening above 2 keV either for quasars, of type I, or for the obscured type II. For each quasar its type was established both based on the features and details of observed X-ray spectrum and previous data.
{"title":"X-ray spectral features and classification of selected QSOs","authors":"L. Zadorozhna, A. Tugay, Nadiia Pulatova, Oleh Maluy","doi":"10.30970/jps.25.4901","DOIUrl":"https://doi.org/10.30970/jps.25.4901","url":null,"abstract":"We present the results of a systematic analysis of the XMM-Newton spectra of nearby optically bright QSOs. The objects have been selected from X-ray Galaxy Catalog Xgal20. It is a catalog of 1172 manually identi(cid:28)ed and classi(cid:28)ed galaxies, obtained as a cross-correlation between the 4XMM-DR9 catalog and the Hyper-Linked Extragalactic Databases and Archives (HyperLeda) with an X-ray (cid:29)ux greater than F ≥ 10 − 13 erg / ( cm 2 · s ) . The goal of this work is to characterize the X-ray spectral properties of selected QSOs in the 0.1 (cid:21) 10 keV energy band. The majority of the sources (6 out of 11) are classi(cid:28)ed as radio-quiet QSOs. We studied optical spectra, hardness ratios and performed X-ray spectral (cid:28)ts for the 10 brighter sources. In most cases, the power law model with absorption is good enough to simulate observed continua. However, the details of the spectrum in some sources signi(cid:28)cantly complicate the model for (cid:28)tting. The majority of sources have steep spectra Γ > 2 . 1 . Extremely steep photon index ( ∼ 2 . 4 − 2 . 5 ) in our sample occurs for three radio-loud type I quasars. We detected Fe K α line for two radio-loud type II quasars. We (cid:28)nd no strong evidence for spectral hardening above 2 keV either for quasars, of type I, or for the obscured type II. For each quasar its type was established both based on the features and details of observed X-ray spectrum and previous data.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"197 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77714467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, the generation of magnetic fields in a nonuniformly rotating layer of finite thickness of an electrically conducting fluid by thermomagnetic (TM) instability. This instability arises due to the temperature gradient $nabla T_0$ and thermoelectromotive coefficient gradient $nablaalpha $. The influence of the generation of a toroidal magnetic field by TM instability on convective instability in a nonuniformly rotating layer of an electrically conductive fluid in the presence of a vertical constant magnetic field ${bf{B}}_0 | {rm OZ}$ is established. As a result of applying the method of perturbation theory for the small parameter $ epsilon = sqrt {(textrm {Ra}-textrm {Ra}_c) / textrm {Ra}_c} $ of supercriticality of the stationary Rayleigh number $textrm {Ra}_c$ a nonlinear equation of the Ginzburg-Landau type was obtained. This equation describes the evolution of the finite amplitude of perturbations. Numerical solutions of this equation made it possible to determine the heat transfer in the fluid layer with and without TM effects. It is shown that the amplitude of the stationary toroidal magnetic field noticeably increases with allowance for TM effects.
{"title":"Generation of magnetic fields by thermomagnetic effects in a nonuniformly rotating layer of an electrically conductive fluid","authors":"M. Kopp, K. Kulik, A. Tur, V. Yanovsky","doi":"10.30970/JPS.25.2401","DOIUrl":"https://doi.org/10.30970/JPS.25.2401","url":null,"abstract":"In this paper, the generation of magnetic fields in a nonuniformly rotating layer of finite thickness of an electrically conducting fluid by thermomagnetic (TM) instability. This instability arises due to the temperature gradient $nabla T_0$ and thermoelectromotive coefficient gradient $nablaalpha $. The influence of the generation of a toroidal magnetic field by TM instability on convective instability in a nonuniformly rotating layer of an electrically conductive fluid in the presence of a vertical constant magnetic field ${bf{B}}_0 | {rm OZ}$ is established. As a result of applying the method of perturbation theory for the small parameter $ epsilon = sqrt {(textrm {Ra}-textrm {Ra}_c) / textrm {Ra}_c} $ of supercriticality of the stationary Rayleigh number $textrm {Ra}_c$ a nonlinear equation of the Ginzburg-Landau type was obtained. This equation describes the evolution of the finite amplitude of perturbations. Numerical solutions of this equation made it possible to determine the heat transfer in the fluid layer with and without TM effects. It is shown that the amplitude of the stationary toroidal magnetic field noticeably increases with allowance for TM effects.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"238 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76108816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A hydrodynamic model for the description of small acoustic oscillations in a turbulent giant molecular cloud is constructed by averaging the Euler equation over Reynolds, taking into account the turbulence of a self-consistent gravitational (cid:28)eld that has zero (cid:28)rst moment and nonzero second moment in equilibrium. It is shown that, in addition to the Reynolds turbulent stress tensor, the momentum (cid:29)ow tensor includes the second correlation moment of the gravitational (cid:28)eld strength, both potential and vortex, for which the time equation is obtained from the Einstein equations in non-relativistic approximation. After linearization, this equation is ∂ t (cid:104) g i g k (cid:105) = ( ∂ k v i + ∂ i v k − 2 ∂ l v l δ ik ) (cid:10) g 2 (cid:11) 0 / 6 , where ∂ t ant ∂ i are the time and spatial derivatives, v i is the mass velocity component, (cid:10) g 2 (cid:11) 0 is the square of a self-consistent gravitational (cid:28)eld strength equilibrium value. Two transverse and longitudinal branches of acoustic oscillations in a homogeneous isotropic cloud are obtained. Zeroing of the transverse oscillations velocity gives a limiting condition for the stability of the giant molecular cloud (cid:10) v 2 (cid:11) 0 − (cid:10) g 2 (cid:11) 0 / (8 πGρ 0 ) ≥ 0 , where (cid:10) v 2 (cid:11) 0 is the mean square turbulent velocity, G is the gravitational constant, ρ 0 is the equilibrium density value. Thus, the doubled energy density of the turbulent motion must be greater than the gravitational (cid:28)eld energy density. It is shown that the thermal motion does not a(cid:27)ect the stability of the system. For the spherical shape of the cloud, the radius of the giant molecular cloud is obtained, which is consistent with observational data.
考虑具有零(cid:28)静止矩和非零平衡第二矩的自一致引力场(cid:28)的湍流，通过对Reynolds上的欧拉方程进行平均，建立了描述湍流巨大分子云中小声波振荡的流体动力学模型。结果表明，除了雷诺湍流应力张量外，动量(cid:29)ow张量还包含引力场强(cid:28)的第二次相关矩，即势和涡，其时间方程由非相对论近似的爱因斯坦方程得到。线性化后，该方程为∂t (cid:104) g i g k (cid:105) =(∂k vi +∂iv k−2∂l v l δ ik) (cid:10) g 2 (cid:11) 0 / 6，其中∂t ant∂i是时间和空间导数，vi是质量速度分量，(cid:10) g 2 (cid:11) 0是自洽引力(cid:28)场强平衡值的平方。得到了均匀各向同性云中声振荡的两个横向和纵向分支。横向振荡速度归零给出了巨大分子云(cid:10) v2 (cid:11) 0 - (cid:10) g2 (cid:11) 0 / (8 πGρ 0)≥0的稳定性的极限条件，其中(cid:10) v2 (cid:11) 0为湍流速度的均方，g为引力常数，ρ 0为平衡密度值。因此，紊流运动的倍能量密度必须大于重力场(cid:28)的能量密度。结果表明，热运动不影响系统的稳定性。对于云的球形，得到了巨分子云的半径，与观测数据一致。
{"title":"Acoustic waves in a turbulent giant molecular cloud taking into account the correlations of gravitational field","authors":"Îëåñÿ Ãîí÷àðà, ïðîñï. Ãàãàðiíà","doi":"10.30970/JPS.25.1903","DOIUrl":"https://doi.org/10.30970/JPS.25.1903","url":null,"abstract":"A hydrodynamic model for the description of small acoustic oscillations in a turbulent giant molecular cloud is constructed by averaging the Euler equation over Reynolds, taking into account the turbulence of a self-consistent gravitational (cid:28)eld that has zero (cid:28)rst moment and nonzero second moment in equilibrium. It is shown that, in addition to the Reynolds turbulent stress tensor, the momentum (cid:29)ow tensor includes the second correlation moment of the gravitational (cid:28)eld strength, both potential and vortex, for which the time equation is obtained from the Einstein equations in non-relativistic approximation. After linearization, this equation is ∂ t (cid:104) g i g k (cid:105) = ( ∂ k v i + ∂ i v k − 2 ∂ l v l δ ik ) (cid:10) g 2 (cid:11) 0 / 6 , where ∂ t ant ∂ i are the time and spatial derivatives, v i is the mass velocity component, (cid:10) g 2 (cid:11) 0 is the square of a self-consistent gravitational (cid:28)eld strength equilibrium value. Two transverse and longitudinal branches of acoustic oscillations in a homogeneous isotropic cloud are obtained. Zeroing of the transverse oscillations velocity gives a limiting condition for the stability of the giant molecular cloud (cid:10) v 2 (cid:11) 0 − (cid:10) g 2 (cid:11) 0 / (8 πGρ 0 ) ≥ 0 , where (cid:10) v 2 (cid:11) 0 is the mean square turbulent velocity, G is the gravitational constant, ρ 0 is the equilibrium density value. Thus, the doubled energy density of the turbulent motion must be greater than the gravitational (cid:28)eld energy density. It is shown that the thermal motion does not a(cid:27)ect the stability of the system. For the spherical shape of the cloud, the radius of the giant molecular cloud is obtained, which is consistent with observational data.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"3 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80201513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, approximate analytical solutions of both modi(cid:28)ed Klein(cid:21)Gordon equation and Schr(cid:4)odinger equation in noncommutative relativistic and nonrelativistic three-dimensional real space have been explored by using the Pekeris approximation scheme to deal with the centrifugal term, Bopp’s shift method and standard perturbation theory. We present the bound-state energy equation with a newly proposed potential called the modi(cid:28)ed Morse potential under the condition of equal scalar and vector potentials. The potential is a superposition of the Morse potential and some exponential radial terms. The aim of combining these potentials is to have an extensive application. We show that the new energy depends on the global parameters ( Θ c and σ c ) characterizing the noncommutativity space-space and the potential parameter ( D e , r e , α ) in addition to the Gamma function and the discreet atomic quantum numbers ( j, l, s, m ) . The present results are applied in calculating both the energy spectrum for a few heterogeneous (LiH, HCl, NO) and homogeneous (H 2 , I 2 , O 2 ) diatomic molecules. We have also discussed some special cases of physical importance.
{"title":"Bound-state solutions of the modified Klein–Gordon and Schrödinger equations for arbitrary l-state with the modified Morse potential in the symmetries of noncommutative quantum mechanics","authors":"A. Maireche","doi":"10.30970/JPS.25.1002","DOIUrl":"https://doi.org/10.30970/JPS.25.1002","url":null,"abstract":"In this work, approximate analytical solutions of both modi(cid:28)ed Klein(cid:21)Gordon equation and Schr(cid:4)odinger equation in noncommutative relativistic and nonrelativistic three-dimensional real space have been explored by using the Pekeris approximation scheme to deal with the centrifugal term, Bopp’s shift method and standard perturbation theory. We present the bound-state energy equation with a newly proposed potential called the modi(cid:28)ed Morse potential under the condition of equal scalar and vector potentials. The potential is a superposition of the Morse potential and some exponential radial terms. The aim of combining these potentials is to have an extensive application. We show that the new energy depends on the global parameters ( Θ c and σ c ) characterizing the noncommutativity space-space and the potential parameter ( D e , r e , α ) in addition to the Gamma function and the discreet atomic quantum numbers ( j, l, s, m ) . The present results are applied in calculating both the energy spectrum for a few heterogeneous (LiH, HCl, NO) and homogeneous (H 2 , I 2 , O 2 ) diatomic molecules. We have also discussed some special cases of physical importance.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"4 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78861281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Quantized space described by time reversal invariant and rotationally invariant noncommutative algebra of canonical type is studied. A particle in uniform field is considered. We find exactly the energy of a particle in uniform field in the quantized space and its wavefunctions. It is shown that the motion of the particle in the field direction in time reversal invariant and rotationally invariant noncommutative space is the same as in the ordinary space (space with the ordinary commutation relations for operators of coordinates and operators of momenta). Noncommutativity of coordinates has influence only on the motion of the particle in the directions perpendicular to the field direction. Namely, space quantization has effect on the mass of the particle.
{"title":"Particle in a uniform field in a noncommutative space with preserved time reversal and rotational symmetries","authors":"Kh. P. Gnatenko, Kh. I. Stakhur, A. V. Kryzhova","doi":"10.30970/JPS.25.2002","DOIUrl":"https://doi.org/10.30970/JPS.25.2002","url":null,"abstract":"Quantized space described by time reversal invariant and rotationally invariant noncommutative algebra of canonical type is studied. A particle in uniform field is considered. We find exactly the energy of a particle in uniform field in the quantized space and its wavefunctions. It is shown that the motion of the particle in the field direction in time reversal invariant and rotationally invariant noncommutative space is the same as in the ordinary space (space with the ordinary commutation relations for operators of coordinates and operators of momenta). Noncommutativity of coordinates has influence only on the motion of the particle in the directions perpendicular to the field direction. Namely, space quantization has effect on the mass of the particle.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"29 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81176932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Three-dimensional simulations of wave propagation in a granular medium layer containing particles with polydisperse size distribution are performed using the discrete element method (DEM). The wave is generated by a piston subjected to an impulse load. It is shown that in the free surface layer, rotation wave structures are formed. Their location, time of occurrence and duration are determi-ned using correlation analysis. These wave structures are revealed when the friction between the grains (particles) is incorporated and, moreover, the gravitation (cid:28)eld resulting in the non-uniform distribution of the inter-particle force (cid:28)eld is taken into account. The absence of the rotation wave formation is also shown when the inhomogeneity caused by the gravitational (cid:28)eld is destroyed by vertical loading.
{"title":"Nonlinear wave dynamics of a disperse granular layer stimulated by an inwards moving piston","authors":"S. Mykulyak, S. Skurativskyi","doi":"10.30970/JPS.25.1401","DOIUrl":"https://doi.org/10.30970/JPS.25.1401","url":null,"abstract":"Three-dimensional simulations of wave propagation in a granular medium layer containing particles with polydisperse size distribution are performed using the discrete element method (DEM). The wave is generated by a piston subjected to an impulse load. It is shown that in the free surface layer, rotation wave structures are formed. Their location, time of occurrence and duration are determi-ned using correlation analysis. These wave structures are revealed when the friction between the grains (particles) is incorporated and, moreover, the gravitation (cid:28)eld resulting in the non-uniform distribution of the inter-particle force (cid:28)eld is taken into account. The absence of the rotation wave formation is also shown when the inhomogeneity caused by the gravitational (cid:28)eld is destroyed by vertical loading.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"66 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83294102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Context. The paper presents a computational scheme and a number of techniques for increasing the e(cid:30)ciency of mathematical modeling of the energy characteristics of metal clusters with vacancies. The object of the research is the process of calculating wave functions and (cid:28)nding eigenvalues using the Numerov and the shooting methods. local density approximation for calculating the energy characteristics of nanoclusters. At the simulation stage, the one-electron wave function was calculated by (cid:16)stitching(cid:17) it from two parts at an empirically selected point with normalization before and after the procedure. A number of techniques have been developed to improve the quality of the simulation: calculating the optimal step, limiting changes in the electrostatic pro(cid:28)le, managing the resulting data arrays, etc. For calculations on a supercomputer, the distribution between the (cid:29)ows was carried out. Results. At the modeling stage, economic models of the metal sphere with a vacancy in the center were developed. For the simulation stage, a method of stable two-sided calculation of the wave function using the shooting and the Numerov methods with the optimal step has been developed. The full computational scheme for the simulation is implemented in C ++ for calculation on a PC and on a supercomputer. The simulation results were compared with the ab-initio calculation data and experimental data for Cs, Rb, K, Na, Li, Mg, and Al clusters with and without vacancies (calculation error < 15%). Conclusions. The developed computational scheme and modeling technique allow increasing the simulation e(cid:30)ciency and obtaining adequate energy characteristics of metal spherical nanoclusters with and without vacancies. Further research might focus on the modi(cid:28)cation of models and simulation techniques for the study of layered nanoscale systems.
{"title":"Increasing the efficiency of modeling the energy characteristics of nanoclusters","authors":"O. Vasylenko, V. Reva, V. Pogosov","doi":"10.30970/JPS.25.1001","DOIUrl":"https://doi.org/10.30970/JPS.25.1001","url":null,"abstract":"Context. The paper presents a computational scheme and a number of techniques for increasing the e(cid:30)ciency of mathematical modeling of the energy characteristics of metal clusters with vacancies. The object of the research is the process of calculating wave functions and (cid:28)nding eigenvalues using the Numerov and the shooting methods. local density approximation for calculating the energy characteristics of nanoclusters. At the simulation stage, the one-electron wave function was calculated by (cid:16)stitching(cid:17) it from two parts at an empirically selected point with normalization before and after the procedure. A number of techniques have been developed to improve the quality of the simulation: calculating the optimal step, limiting changes in the electrostatic pro(cid:28)le, managing the resulting data arrays, etc. For calculations on a supercomputer, the distribution between the (cid:29)ows was carried out. Results. At the modeling stage, economic models of the metal sphere with a vacancy in the center were developed. For the simulation stage, a method of stable two-sided calculation of the wave function using the shooting and the Numerov methods with the optimal step has been developed. The full computational scheme for the simulation is implemented in C ++ for calculation on a PC and on a supercomputer. The simulation results were compared with the ab-initio calculation data and experimental data for Cs, Rb, K, Na, Li, Mg, and Al clusters with and without vacancies (calculation error < 15%). Conclusions. The developed computational scheme and modeling technique allow increasing the simulation e(cid:30)ciency and obtaining adequate energy characteristics of metal spherical nanoclusters with and without vacancies. Further research might focus on the modi(cid:28)cation of models and simulation techniques for the study of layered nanoscale systems.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"27 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83193274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. M. Koval'chuk, Y. Vovchyk, O. Baran, A. Bilinsky, I. P. Laushnyk, M. Stodilka, M. Hirnyak
A comprehensive research was conducted to establish the in(cid:29)uence of solar pressure on the existence of arti(cid:28)cial Earth satellites in their orbit. Six low-orbit satellites and one satellite with a high-elliptical orbit moving in orbit during 2001(cid:21)2020 were selected for the study. We used the USSTRATCOM database of the satellites’ orbital elements (http://www.space-track.org/), additional data were taken from CalSky (https://www.calsky.com) and TLEtools (https://tletools.readthedocs.io). Taking into account light pressure, we re(cid:28)ned the calculation of the duration of a satellite’s orbital motion, which we had performed earlier [M. M. Koval’chuk, Bull. Natl. Univ. Kyiv. Astron. 55, 39 (2017)], and clari(cid:28)ed the moment of its destruction. Using the proposed method allowed us to reduce the di(cid:27)erence between the calculated and the real lifetime of satellites: for low-orbit satellites, the di(cid:27)erence between the calculated and the real time of their existence in orbit does not exceed ± 1 day, for a satellite with a highly elliptical orbit it is +2 days. Such accuracy is su(cid:30)cient to produce proper forecasts. Thus, consideration of light pressure gives a small correction in the calculations in the case of low-orbit satellites, but this correction can be signi(cid:28)cant for low-mass and large-surface objects moving in medium and high (geostationary) orbits [Ch. Lucking, C. Colombo, C. R. McInnes, Acta Astronaut. 77, 197 (2012)].Keywords:
为了确定太阳压力对人造地球卫星在轨存在的影响，进行了全面的研究。选取2001(cid:21)2020年在轨运行的6颗低轨道卫星和1颗高椭圆轨道卫星作为研究对象。我们使用了USSTRATCOM卫星轨道要素数据库(http://www.space-track.org/)，其他数据来自CalSky (https://www.calsky.com)和TLEtools (https://tletools.readthedocs.io)。考虑到光的压力，我们(cid:28)需要计算卫星轨道运动的持续时间，我们之前已经做过了。科瓦尔丘克先生，布尔。国家的。大学,基辅。天文学，55,39(2017)]，而克拉丽(cid:28)则记录了它毁灭的时刻。采用该方法可以减小卫星计算寿命与实际寿命之间的差值(cid:27):对于低轨道卫星，其计算寿命与实际在轨生存时间的差值不超过±1天，对于高椭圆轨道卫星，其差值为+2天。这样的精确度对于做出正确的预测是非常重要的。因此，在低轨道卫星的情况下，考虑光压的计算误差很小，但对于在中、高(地球静止)轨道上运行的低质量和大表面物体，这种误差可能很大(cid:28) [Ch. Lucking, C. Colombo, C. R. McInnes，《宇航员学报》，77,197(2012)]。关键词:
{"title":"Approximate evaluation of the duration of the orbital motion of artificial Earth satellites taking into account light pressure","authors":"M. M. Koval'chuk, Y. Vovchyk, O. Baran, A. Bilinsky, I. P. Laushnyk, M. Stodilka, M. Hirnyak","doi":"10.30970/JPS.25.1901","DOIUrl":"https://doi.org/10.30970/JPS.25.1901","url":null,"abstract":"A comprehensive research was conducted to establish the in(cid:29)uence of solar pressure on the existence of arti(cid:28)cial Earth satellites in their orbit. Six low-orbit satellites and one satellite with a high-elliptical orbit moving in orbit during 2001(cid:21)2020 were selected for the study. We used the USSTRATCOM database of the satellites’ orbital elements (http://www.space-track.org/), additional data were taken from CalSky (https://www.calsky.com) and TLEtools (https://tletools.readthedocs.io). Taking into account light pressure, we re(cid:28)ned the calculation of the duration of a satellite’s orbital motion, which we had performed earlier [M. M. Koval’chuk, Bull. Natl. Univ. Kyiv. Astron. 55, 39 (2017)], and clari(cid:28)ed the moment of its destruction. Using the proposed method allowed us to reduce the di(cid:27)erence between the calculated and the real lifetime of satellites: for low-orbit satellites, the di(cid:27)erence between the calculated and the real time of their existence in orbit does not exceed ± 1 day, for a satellite with a highly elliptical orbit it is +2 days. Such accuracy is su(cid:30)cient to produce proper forecasts. Thus, consideration of light pressure gives a small correction in the calculations in the case of low-orbit satellites, but this correction can be signi(cid:28)cant for low-mass and large-surface objects moving in medium and high (geostationary) orbits [Ch. Lucking, C. Colombo, C. R. McInnes, Acta Astronaut. 77, 197 (2012)].Keywords:","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"20 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89306086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents the results of a study of the existence of nine near-Earth meteorite-producing groups in asteroidal orbits, containing sporadic (cid:28)reballs from the IAU MDC-2007 database, sporadic meteors from the SonotaCo database, meteorites (cid:22) namely, L 5 , L 6 and H 4 − H 6 ordinary chondrites and an ureilite, for which atmospheric and orbital parameters are known from instrumental observations. Orbits of the selected members of meteorite-producing groups were classi(cid:28)ed as asteroid orbits according to the Tisserand parameter T j > 3 . 1 . Dynamic links between the members of the identi(cid:28)ed meteorite-producing groups and instrumentally observed known meteorites which were taken as a reference for the search of potential group members were tested using orbital similarity criteria, in particular the Drummond criterion (cid:22) D D and the Southworth and Hawkins criterion (cid:22) D SH . As a result, several meteorite-dropping sporadic (cid:28)reballs and small meteors, whose orbits are similar to the asteroid orbits of nine known meteorites, were detected and reckoned as possible members of groups.
本文介绍了在小行星轨道上存在的9个近地陨石产生群的研究结果，其中包括来自IAU MDC-2007数据库的零星(cid:28)回球，来自SonotaCo数据库的零星流星，陨石(cid:22)，即l5, l6和h4 - h6普通球粒陨石和一颗球粒陨石，其大气和轨道参数已通过仪器观测得到。根据Tisserand参数tjb>3，选定的产生陨石群成员的轨道被归类为小行星轨道。1 ． 已确定的(cid:28)ed陨石产生群的成员与仪器观测到的已知陨石之间的动态联系，作为搜索潜在群体成员的参考，使用轨道相似标准进行测试，特别是Drummond标准(cid:22) D D和Southworth and Hawkins标准(cid:22) D SH。结果，发现了几颗零星的(cid:28)回球和小流星，它们的轨道与九颗已知陨石的小行星轨道相似，并认为它们可能是群的成员。
{"title":"Groups of meteorites and meteorite-dropping fireballs in asteroidal orbits","authors":"Y. Gorbanev, N. Konovalova, N. K. Davruqov","doi":"10.30970/jps.25.4902","DOIUrl":"https://doi.org/10.30970/jps.25.4902","url":null,"abstract":"This paper presents the results of a study of the existence of nine near-Earth meteorite-producing groups in asteroidal orbits, containing sporadic (cid:28)reballs from the IAU MDC-2007 database, sporadic meteors from the SonotaCo database, meteorites (cid:22) namely, L 5 , L 6 and H 4 − H 6 ordinary chondrites and an ureilite, for which atmospheric and orbital parameters are known from instrumental observations. Orbits of the selected members of meteorite-producing groups were classi(cid:28)ed as asteroid orbits according to the Tisserand parameter T j > 3 . 1 . Dynamic links between the members of the identi(cid:28)ed meteorite-producing groups and instrumentally observed known meteorites which were taken as a reference for the search of potential group members were tested using orbital similarity criteria, in particular the Drummond criterion (cid:22) D D and the Southworth and Hawkins criterion (cid:22) D SH . As a result, several meteorite-dropping sporadic (cid:28)reballs and small meteors, whose orbits are similar to the asteroid orbits of nine known meteorites, were detected and reckoned as possible members of groups.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"2 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90162104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Yıldırım, E. Topkara, A. Biswas, H. Triki, M. Ekici, P. Guggilla, S. Khan, M. Belić
This paper recovers a full spectrum of optical solitons that are generated by the combined e(cid:27)ects of dispersion and nonlinearity of the pulse propagation. The quadratic(cid:21)cubic form of the nonlinear refractive index is incorporated in the governing nonlinear Schr(cid:4)odinger equation, which governs the dynamics of the soliton transmission across trans-continental and transoceanic distances. The model is considered with a nonlinear chromatic dispersion that is required to sustain for smooth transmission of soliton pulses in optical (cid:28)bers, couplers, PCF, magneto-optic waveguides, crystals, metamaterials, metasurfaces, birefringent (cid:28)bers, DWDM systems and other form of waveguides. Solitons in birefringent (cid:28)bers as well as solitons in polarization preserving (cid:28)bers are considered. The governing model is treated with Hamiltonian type perturbation terms. The perturbation terms are with full intensity. The model is studied for the intensity count m = 1 . The adopted integration algorithm is the sine-Gordon equation method that reveals single form soliton solutions as well as dual-form soliton solutions. These solitons are dark soliton, singular soliton, bright soliton and combo singular soliton. Also, dark soliton represents a kink/anti-kink solitary wave or a shock wave in (cid:29)uid dynamics. The respective constraint conditions are also in place to guarantee the existence of such solitons.
{"title":"Optical soliton perturbation and polarization with quadratic--cubic nonlinearity by sine-Gordon equation approach","authors":"Y. Yıldırım, E. Topkara, A. Biswas, H. Triki, M. Ekici, P. Guggilla, S. Khan, M. Belić","doi":"10.30970/JPS.25.2001","DOIUrl":"https://doi.org/10.30970/JPS.25.2001","url":null,"abstract":"This paper recovers a full spectrum of optical solitons that are generated by the combined e(cid:27)ects of dispersion and nonlinearity of the pulse propagation. The quadratic(cid:21)cubic form of the nonlinear refractive index is incorporated in the governing nonlinear Schr(cid:4)odinger equation, which governs the dynamics of the soliton transmission across trans-continental and transoceanic distances. The model is considered with a nonlinear chromatic dispersion that is required to sustain for smooth transmission of soliton pulses in optical (cid:28)bers, couplers, PCF, magneto-optic waveguides, crystals, metamaterials, metasurfaces, birefringent (cid:28)bers, DWDM systems and other form of waveguides. Solitons in birefringent (cid:28)bers as well as solitons in polarization preserving (cid:28)bers are considered. The governing model is treated with Hamiltonian type perturbation terms. The perturbation terms are with full intensity. The model is studied for the intensity count m = 1 . The adopted integration algorithm is the sine-Gordon equation method that reveals single form soliton solutions as well as dual-form soliton solutions. These solitons are dark soliton, singular soliton, bright soliton and combo singular soliton. Also, dark soliton represents a kink/anti-kink solitary wave or a shock wave in (cid:29)uid dynamics. The respective constraint conditions are also in place to guarantee the existence of such solitons.","PeriodicalId":43482,"journal":{"name":"Journal of Physical Studies","volume":"282 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77842307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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