Abstract In this paper, a new theoretical approach is suggested for the numerical calculation algorithm of the fourth virial coefficient and its components with the Kihara potential. For the first time, this study reports the results of the fourth virial coefficient over the Kihara potential. The proposed method can be used to calculate the thermodynamics properties of gases with developed correctness. The method is tested for some molecules and as an example of application, the proposed method has been performed for gases of C3H8 and SF6. The obtained calculation results have been compared with the theoretical and experimental data and the results have been found to be consistent with the literature data. It can be seen from the application that the calculation of the fourth virial coefficient with the Kihara potential can provide important results in the calculation of the thermophysical properties of other real systems.
{"title":"Theoretical determination of speed of sound and fourth virial coefficient by using Kihara (12–6) potential","authors":"E. Somuncu, Bahtiyar A. Mamedov","doi":"10.1515/zna-2023-0220","DOIUrl":"https://doi.org/10.1515/zna-2023-0220","url":null,"abstract":"Abstract In this paper, a new theoretical approach is suggested for the numerical calculation algorithm of the fourth virial coefficient and its components with the Kihara potential. For the first time, this study reports the results of the fourth virial coefficient over the Kihara potential. The proposed method can be used to calculate the thermodynamics properties of gases with developed correctness. The method is tested for some molecules and as an example of application, the proposed method has been performed for gases of C3H8 and SF6. The obtained calculation results have been compared with the theoretical and experimental data and the results have been found to be consistent with the literature data. It can be seen from the application that the calculation of the fourth virial coefficient with the Kihara potential can provide important results in the calculation of the thermophysical properties of other real systems.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90589186","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}
Abstract The relaxed state of a magnetized relativistic hot plasma composed of inertial electrons and positrons having different relativistic temperatures and a fraction of static positive ions is studied. From the steady-state solutions of vortex dynamics equations and the relation for current density, a non-force-free triple Beltrami (TB) relaxed state equation is derived. The TB state is characterized by three scale parameters that consequently provide three different self-organized structures. The analysis of the relaxed state shows that for specific values of generalized helicities, the disparity in relativistic temperature and the existence of a small fraction of static positive ions in pair plasma can transform the nature of scale parameters. Moreover, an analytical solution of the TB state for an axisymmetric cylindrical geometry with an internal conductor configuration demonstrates that due to asymmetries of temperature and density of plasma species, diamagnetic structures can transform into paramagnetic ones and vice versa. The present study will improve our understanding of pair plasmas in trap-based plasma confinement experiments and astrophysical environments.
{"title":"Impact of temperature asymmetry and small fraction of static positive ions on the relaxed states of a relativistic hot pair plasma","authors":"Usman Shazad, M. Iqbal","doi":"10.1515/zna-2023-0112","DOIUrl":"https://doi.org/10.1515/zna-2023-0112","url":null,"abstract":"Abstract The relaxed state of a magnetized relativistic hot plasma composed of inertial electrons and positrons having different relativistic temperatures and a fraction of static positive ions is studied. From the steady-state solutions of vortex dynamics equations and the relation for current density, a non-force-free triple Beltrami (TB) relaxed state equation is derived. The TB state is characterized by three scale parameters that consequently provide three different self-organized structures. The analysis of the relaxed state shows that for specific values of generalized helicities, the disparity in relativistic temperature and the existence of a small fraction of static positive ions in pair plasma can transform the nature of scale parameters. Moreover, an analytical solution of the TB state for an axisymmetric cylindrical geometry with an internal conductor configuration demonstrates that due to asymmetries of temperature and density of plasma species, diamagnetic structures can transform into paramagnetic ones and vice versa. The present study will improve our understanding of pair plasmas in trap-based plasma confinement experiments and astrophysical environments.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88896667","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}
Abstract Chaotic dynamics of a fifth-order extended Duffing-van der Pol system with a non-smooth periodic perturbation and parametric excitation are investigated both analytically and numerically in this paper. With the Fourier series, the system is expanded to the equivalent smooth system. The Melnikov perturbation method is used to derive the horseshoe chaos condition in the cases of homoclinic and heteroclinic intersections. The chaotic features for different system parameters are investigated in detail. The monotonic variation of the coefficients of parametric excitation and non-smooth periodic disturbance is found. With numerical methods, we validate the analytical results obtained by Melnikov’s method. The impact of initial conditions is carefully analyzed by basins of attraction and the effect of non-smooth periodic disturbance on the basin of attraction is also investigated. Besides, the effect of different parameters on the bifurcation pathway into chaotic attractors is examined.
本文对具有非光滑周期扰动和参数激励的五阶扩展Duffing-van der Pol系统的混沌动力学进行了解析和数值研究。利用傅里叶级数，将系统展开为等效光滑系统。利用Melnikov摄动方法推导了同斜和异斜交点的马蹄形混沌条件。详细研究了不同系统参数下的混沌特性。发现了参数激励系数和非光滑周期扰动系数的单调变化。用数值方法验证了Melnikov方法的解析结果。通过引力盆地仔细分析了初始条件的影响，并研究了非光滑周期扰动对引力盆地的影响。此外，研究了不同参数对混沌吸引子分岔路径的影响。
{"title":"Chaotic dynamics of an extended Duffing-van der Pol system with a non-smooth perturbation and parametric excitation","authors":"Sengen Hu, Liangqiang Zhou","doi":"10.1515/zna-2023-0117","DOIUrl":"https://doi.org/10.1515/zna-2023-0117","url":null,"abstract":"Abstract Chaotic dynamics of a fifth-order extended Duffing-van der Pol system with a non-smooth periodic perturbation and parametric excitation are investigated both analytically and numerically in this paper. With the Fourier series, the system is expanded to the equivalent smooth system. The Melnikov perturbation method is used to derive the horseshoe chaos condition in the cases of homoclinic and heteroclinic intersections. The chaotic features for different system parameters are investigated in detail. The monotonic variation of the coefficients of parametric excitation and non-smooth periodic disturbance is found. With numerical methods, we validate the analytical results obtained by Melnikov’s method. The impact of initial conditions is carefully analyzed by basins of attraction and the effect of non-smooth periodic disturbance on the basin of attraction is also investigated. Besides, the effect of different parameters on the bifurcation pathway into chaotic attractors is examined.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"86 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85207321","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}
Abstract Single phased white light emitting phosphors are more ideal for fabricating white LEDs due to higher stability and color reproducibility. Herein, we report a new white light emitting phosphor, SrCeO3: xSm3+ (x = 1 wt%, 2 wt%, 3 wt%) from a blue light emitting phosphor, SrCeO3 using an efficient, low energy consuming fuel excess gel combustion technique. From the XRD crystallographic investigation, all the synthesised samples have orthorhombic structure with space group Pnma. A broad absorption band in the UV–visible spectra around 350 nm occurs due to the efficient energy transfer from Ce4+ to Sm3+ ion. PL spectra analysis at UV excitations 280 nm and 406 nm, consist of 4f-Sm3+ transitions 4G5/2-6H5/2, 4G5/2-6H7/2, 4G5/2-6H9/2 and charge transfer band from O2− to Ce4+. The energy transfer between activator ions occurs through dipole–dipole interaction, owing to concentration quenching after 2 wt% Sm3+ and the optimised dopant concentration was 2 wt%. SrCe0.98Sm0.02O3 showed mixed blue-yellow-orange-red emission, owing near white light under both excitations. PL data were utilised to find the color parameters and found high color rendering index (CRI ∼ 84) for optimised sample at 406 nm excitation. SEM analysis reveals that the optimised sample exhibit dense ensembled morphology with well-defined grain boundaries and uniformity with average grain size ∼1.24 μm. Further, the elemental composition was confirmed using EDS analysis. From the digital photographs of samples, it is foreseen that, SrCe0.98Sm0.02O3 pumped using near UV LED chip can be used for commercial white light generation.
{"title":"Robust white light emission of UV pumped SrCeO3: xSm3+ perovskites for wLEDs","authors":"Shilpa Cherlan Kottianmadathil, Jasira Seere Valappil, Veena Vannadil Puthiyaveetil, Umadevi Peroor, Nissamudeen Kavukuzhi Meerasahib","doi":"10.1515/zna-2023-0145","DOIUrl":"https://doi.org/10.1515/zna-2023-0145","url":null,"abstract":"Abstract Single phased white light emitting phosphors are more ideal for fabricating white LEDs due to higher stability and color reproducibility. Herein, we report a new white light emitting phosphor, SrCeO3: xSm3+ (x = 1 wt%, 2 wt%, 3 wt%) from a blue light emitting phosphor, SrCeO3 using an efficient, low energy consuming fuel excess gel combustion technique. From the XRD crystallographic investigation, all the synthesised samples have orthorhombic structure with space group Pnma. A broad absorption band in the UV–visible spectra around 350 nm occurs due to the efficient energy transfer from Ce4+ to Sm3+ ion. PL spectra analysis at UV excitations 280 nm and 406 nm, consist of 4f-Sm3+ transitions 4G5/2-6H5/2, 4G5/2-6H7/2, 4G5/2-6H9/2 and charge transfer band from O2− to Ce4+. The energy transfer between activator ions occurs through dipole–dipole interaction, owing to concentration quenching after 2 wt% Sm3+ and the optimised dopant concentration was 2 wt%. SrCe0.98Sm0.02O3 showed mixed blue-yellow-orange-red emission, owing near white light under both excitations. PL data were utilised to find the color parameters and found high color rendering index (CRI ∼ 84) for optimised sample at 406 nm excitation. SEM analysis reveals that the optimised sample exhibit dense ensembled morphology with well-defined grain boundaries and uniformity with average grain size ∼1.24 μm. Further, the elemental composition was confirmed using EDS analysis. From the digital photographs of samples, it is foreseen that, SrCe0.98Sm0.02O3 pumped using near UV LED chip can be used for commercial white light generation.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77558115","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}
S. El-Labany, M. M. Selim, Enas L. Habbak, E. F. El-Shamy
Abstract Bifurcation analysis of ion-acoustic solitary, periodic and superperiodic waves in ultra-relativistic quantum degenerate electron-positron-ion plasma is investigated based on Sagdeev’s pseudopotential approach. The phase plane plots for the superperiodic, periodic, and homoclinic trajectories for the dynamical system are developed. Rarefactive and compressive solitary waves are demonstrated to exist. The influence of plasma parameters on the characteristic properties of the periodic and superperiodic waves is studied. Also, the effect of different plasma parameters on the Sagdeev pseudopotential profile is investigated. The results of this study may be used to shed light on the fundamental properties of nonlinear waves in dense objects (e.g., white dwarfs and neutron stars). These results also may be beneficial in describing laboratory plasma (e.g., interaction experiments of intense laser-solid matter), and plasma applications such as microelectronic devices.
{"title":"Bifurcation analysis of ion-acoustic superperiodic waves in ultra-relativistic dense plasma","authors":"S. El-Labany, M. M. Selim, Enas L. Habbak, E. F. El-Shamy","doi":"10.1515/zna-2022-0248","DOIUrl":"https://doi.org/10.1515/zna-2022-0248","url":null,"abstract":"Abstract Bifurcation analysis of ion-acoustic solitary, periodic and superperiodic waves in ultra-relativistic quantum degenerate electron-positron-ion plasma is investigated based on Sagdeev’s pseudopotential approach. The phase plane plots for the superperiodic, periodic, and homoclinic trajectories for the dynamical system are developed. Rarefactive and compressive solitary waves are demonstrated to exist. The influence of plasma parameters on the characteristic properties of the periodic and superperiodic waves is studied. Also, the effect of different plasma parameters on the Sagdeev pseudopotential profile is investigated. The results of this study may be used to shed light on the fundamental properties of nonlinear waves in dense objects (e.g., white dwarfs and neutron stars). These results also may be beneficial in describing laboratory plasma (e.g., interaction experiments of intense laser-solid matter), and plasma applications such as microelectronic devices.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84135526","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}
Abstract The ultrasonic attenuation studies of alkali halides single crystal AX (A = Li, Na, K and X = F, Cl, Br) have been investigated along <100>, <110> and <111> directions at room temperature. For this investigation, a most appropriate potential model for studying physical studies of rock-salt type alkali halides, the Coulomb and Born–Mayer model has been used to evaluate higher order elastic constants. The second order elastic constants are used to compute the mechanical properties and ultrasonic velocities of the chosen materials. Additionally, the thermal properties have also been evaluated along different orientations. Thermoelastic loss is very small in comparison to the attenuation due to phonon-phonon interaction mechanism at room temperature. The achieved results of AX have been discussed and compared with available experimental and theoretical results.
摘要:研究了碱性卤化物单晶AX (A = Li, Na, K和X = F, Cl, Br)在室温下沿程和方向的超声衰减。本文采用库仑模型和玻恩-迈耶模型对岩盐类碱卤化物的高阶弹性常数进行了计算。二阶弹性常数用于计算所选材料的力学性能和超声速度。此外，还对不同取向的热性能进行了评价。与室温下声子-声子相互作用机制引起的衰减相比，热弹性损失非常小。讨论了AX的计算结果，并与已有的实验和理论结果进行了比较。
{"title":"Investigation of alkali halide crystals AX (A = Li, Na, K; X = F, Cl, Br) by elastic, mechanical and ultrasonic analysis","authors":"Anurag Singh, Devraj Singh","doi":"10.1515/zna-2023-0138","DOIUrl":"https://doi.org/10.1515/zna-2023-0138","url":null,"abstract":"Abstract The ultrasonic attenuation studies of alkali halides single crystal AX (A = Li, Na, K and X = F, Cl, Br) have been investigated along <100>, <110> and <111> directions at room temperature. For this investigation, a most appropriate potential model for studying physical studies of rock-salt type alkali halides, the Coulomb and Born–Mayer model has been used to evaluate higher order elastic constants. The second order elastic constants are used to compute the mechanical properties and ultrasonic velocities of the chosen materials. Additionally, the thermal properties have also been evaluated along different orientations. Thermoelastic loss is very small in comparison to the attenuation due to phonon-phonon interaction mechanism at room temperature. The achieved results of AX have been discussed and compared with available experimental and theoretical results.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89668737","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}
Abstract NiCoFeCu films were electrodeposited on Ti substrates at different deposition potentials and different concentrations of saccharin added to solution. Compositional analysis showed that although Ni was the highest concentration in solution at low potentials of −1.0 V and −1.5 V, the Ni content was lower than the Co content in the films. Anomalous co-deposition behaviour of iron group metals was observed. When the deposition potential increased to −2.0 V and −2.5 V, the Ni content of films increased while the Co, Fe and Cu content decreased. In the case of saccharin addition to the solution, there is a slight change in the film content. All films have face-centred cubic structure. Structural analysis clearly showed that the potential has a significant effect on the texture degree of the films, since the crystal texture changed from (111) to (220) with increasing potential. The surface morphology of the films was observed to be affected by the deposition potential and saccharin concentration. For the magnetic analysis, saturation magnetisation, Ms value gradually decreased from 905 to 715 emu/cm3 with the variation of film content caused by the increase of the potential from −1.0 V to −2.5 V. And, a slight increase in Ms was detected with the addition of saccharin. Besides, the longitudinal and transverse magnetoresistance magnitudes increased from ∼2.5 % to 7.0 % with increasing deposition potential and all films exhibit anisotropic magnetoresistance. Films with desired magnetic properties can be obtained for potential use as magnetic materials in electronics such as magnetoresistive devices.
{"title":"Effect of deposition potential and saccharin addition on structural, magnetic and magnetoresistance characteristics of NiCoFeCu films","authors":"Hilal Kuru, Hakan Köçkar, M. Alper","doi":"10.1515/zna-2023-0137","DOIUrl":"https://doi.org/10.1515/zna-2023-0137","url":null,"abstract":"Abstract NiCoFeCu films were electrodeposited on Ti substrates at different deposition potentials and different concentrations of saccharin added to solution. Compositional analysis showed that although Ni was the highest concentration in solution at low potentials of −1.0 V and −1.5 V, the Ni content was lower than the Co content in the films. Anomalous co-deposition behaviour of iron group metals was observed. When the deposition potential increased to −2.0 V and −2.5 V, the Ni content of films increased while the Co, Fe and Cu content decreased. In the case of saccharin addition to the solution, there is a slight change in the film content. All films have face-centred cubic structure. Structural analysis clearly showed that the potential has a significant effect on the texture degree of the films, since the crystal texture changed from (111) to (220) with increasing potential. The surface morphology of the films was observed to be affected by the deposition potential and saccharin concentration. For the magnetic analysis, saturation magnetisation, Ms value gradually decreased from 905 to 715 emu/cm3 with the variation of film content caused by the increase of the potential from −1.0 V to −2.5 V. And, a slight increase in Ms was detected with the addition of saccharin. Besides, the longitudinal and transverse magnetoresistance magnitudes increased from ∼2.5 % to 7.0 % with increasing deposition potential and all films exhibit anisotropic magnetoresistance. Films with desired magnetic properties can be obtained for potential use as magnetic materials in electronics such as magnetoresistive devices.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88828724","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}
K. Batool, M. Rani, R. Shafique, R. Neffati, Mariam Akram, M. Arshad
Abstract CuCrO3 perovskite structure synthesized via cost-effective sol–gel method successfully as confirmed by X-ray diffraction (XRD) with smaller crystallite size has been reported. EDS confirmed copper chromite perovskite single phase with no extra impurity peak existence. Agglomerated grains resulting average particle size of 9.6 nm as determined from SEM micrographs. PL spectra shows electron transition from VB to CB whereas Raman spectra shows D and G band presence within spectra pointing towards existence of functional groups within structure. Bandgap value of 4.02 eV is calculated from UV–vis spectra. In order to calculate Eu, which is calculated to be 0.960 Ev. All these properties suggested synthesized material applicability as an optoelectronic perovskite material.
{"title":"Structural and optical analysis of nanostructural CuCrO3 perovskite by sol–gel method","authors":"K. Batool, M. Rani, R. Shafique, R. Neffati, Mariam Akram, M. Arshad","doi":"10.1515/zna-2023-0108","DOIUrl":"https://doi.org/10.1515/zna-2023-0108","url":null,"abstract":"Abstract CuCrO3 perovskite structure synthesized via cost-effective sol–gel method successfully as confirmed by X-ray diffraction (XRD) with smaller crystallite size has been reported. EDS confirmed copper chromite perovskite single phase with no extra impurity peak existence. Agglomerated grains resulting average particle size of 9.6 nm as determined from SEM micrographs. PL spectra shows electron transition from VB to CB whereas Raman spectra shows D and G band presence within spectra pointing towards existence of functional groups within structure. Bandgap value of 4.02 eV is calculated from UV–vis spectra. In order to calculate Eu, which is calculated to be 0.960 Ev. All these properties suggested synthesized material applicability as an optoelectronic perovskite material.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87529646","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}
Abstract This paper presents a refined composite multivariate multiscale complexity-entropy causality plane (RCMMCECP) to explore the dynamics features of gas–liquid two-phase flow. Firstly, we employ a series of typical nonlinear time series to confirm the effectiveness of the RCMMCECP, including seven chaotic systems, two random processes, and one periodic process. The comparison results of the proposed method and conventional multivariate multiscale complexity-entropy causality plane (MMCECP) confirm the stability performance of the proposed RCMMCECP. Above all, the RCMMCECP enhances the reliability of the statistical complexity measure over large time scales and exhibits good continuity and noise-resistant ability in multiscale analysis. Then, we employ the RCMMCECP to analyze the upstream and downstream conductance signals. The experimental results demonstrate that the RCMMCECP can characterize the change of complexity and structural stability in the gas-liquid two-phase flow evolution process, effectively revealing its dynamics features.
{"title":"Refined composite multivariate multiscale complexity-entropy causality plane analysis for gas-liquid two-phase flow","authors":"Xingran Li, Chunling Fan, Jiangfan Qin, Rui Yang","doi":"10.1515/zna-2023-0115","DOIUrl":"https://doi.org/10.1515/zna-2023-0115","url":null,"abstract":"Abstract This paper presents a refined composite multivariate multiscale complexity-entropy causality plane (RCMMCECP) to explore the dynamics features of gas–liquid two-phase flow. Firstly, we employ a series of typical nonlinear time series to confirm the effectiveness of the RCMMCECP, including seven chaotic systems, two random processes, and one periodic process. The comparison results of the proposed method and conventional multivariate multiscale complexity-entropy causality plane (MMCECP) confirm the stability performance of the proposed RCMMCECP. Above all, the RCMMCECP enhances the reliability of the statistical complexity measure over large time scales and exhibits good continuity and noise-resistant ability in multiscale analysis. Then, we employ the RCMMCECP to analyze the upstream and downstream conductance signals. The experimental results demonstrate that the RCMMCECP can characterize the change of complexity and structural stability in the gas-liquid two-phase flow evolution process, effectively revealing its dynamics features.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"124 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83485482","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}
Abstract Ba ions were successfully adsorbed using green NiFe2O4-NPs that were generated using Foeniculum vulgare seeds extract. To investigate the structural and textural characteristics of the adsorbent powder, X-ray diffraction (XRD), nitrogen adsorption–desorption isotherm, X-ray photoelectron spectroscopy (XPS), Fourier transformer infrared (FTIR), and scanning/transmission electron microscopy (SEM) examinations were conducted. The FTIR and EDX investigations revealed the formation of NiFe2O4-NPs as indicated by the elemental composition and the bonding patterns. Some remarkable properties, including the growth of crystallite size and lattice parameters, were reached due to the extract addition, as revealed further by XRD examination. The sorption results were consistent with the Langmuir isotherm model, and the kinetic data were in accordance with pseudo-second-order kinetics. As a result of the electrostatic interaction between the negatively charged NiFe2O4-NPs surface and the positively charged Ba (II) ions, the adsorption process improved significantly above pHzc. The NiFe2O4 nanostructures with high competence for Ba2+ adsorption could be nominated to abolish additional harmful metal cations.
{"title":"Green NiFe2O4 nano-sorbent construction via Foeniculum vulgare extract for efficient barium ions removal","authors":"N. Elamin, W. A. El-Fattah, A. Modwi","doi":"10.1515/zna-2023-0094","DOIUrl":"https://doi.org/10.1515/zna-2023-0094","url":null,"abstract":"Abstract Ba ions were successfully adsorbed using green NiFe2O4-NPs that were generated using Foeniculum vulgare seeds extract. To investigate the structural and textural characteristics of the adsorbent powder, X-ray diffraction (XRD), nitrogen adsorption–desorption isotherm, X-ray photoelectron spectroscopy (XPS), Fourier transformer infrared (FTIR), and scanning/transmission electron microscopy (SEM) examinations were conducted. The FTIR and EDX investigations revealed the formation of NiFe2O4-NPs as indicated by the elemental composition and the bonding patterns. Some remarkable properties, including the growth of crystallite size and lattice parameters, were reached due to the extract addition, as revealed further by XRD examination. The sorption results were consistent with the Langmuir isotherm model, and the kinetic data were in accordance with pseudo-second-order kinetics. As a result of the electrostatic interaction between the negatively charged NiFe2O4-NPs surface and the positively charged Ba (II) ions, the adsorption process improved significantly above pHzc. The NiFe2O4 nanostructures with high competence for Ba2+ adsorption could be nominated to abolish additional harmful metal cations.","PeriodicalId":23871,"journal":{"name":"Zeitschrift für Naturforschung A","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83102641","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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