Indian Journal of Physics最新文献_第2页

Analytical solutions of the (^{222})Rn radon diffusion-advection equation through soil using Atangana–Baleanu time fractional derivative 利用Atangana-Baleanu时间分数阶导数解析解(^{222})氡在土壤中的扩散-平流方程

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-14 DOI: 10.1007/s12648-024-03445-4

A. A. Atangana Likéné, J. E. Ndjana Nkoulou II, M. Oumar Bobbo, Saidou

{"title":"Analytical solutions of the (^{222})Rn radon diffusion-advection equation through soil using Atangana–Baleanu time fractional derivative","authors":"A. A. Atangana Likéné, J. E. Ndjana Nkoulou II, M. Oumar Bobbo,  Saidou","doi":"10.1007/s12648-024-03445-4","DOIUrl":"10.1007/s12648-024-03445-4","url":null,"abstract":"<div>In this paper, we propose a mathematical model based on the fractality of time to describe and predict the radon diffusion-advection process through soil. For a given decay constant, (lambda _{R_n}), and a uniform diffusion coefficient, (D_0), and assuming that radon flow occurs in only one direction, the process is modeled by the one-dimensional diffusion-advection equation. This equation is generalized to the fractional order (alpha ), based on the newly proposed Atangana-Baleanu derivative in the Caputo sense. Analytical solutions are obtained using Laplace and sine-Fourier transforms, and the key points for choosing the Atangana-Baleanu fractional derivative are highlighted. The role of the fractional order parameter is significant in this research. It is observed that, at a given time t, each radon concentration profile increases with soil depth, regardless of the value of (alpha ). However, the radon concentration profile reaches higher values as the fractional order parameter increases. A memory effect is observed in the system each time the value of (alpha ) is changed, providing evidence of the fractal nature of the process. The obtained pattern reveals concentration levels that are not accessible in classical studies. This work goes beyond previous studies in the literature by showing that the investigated fractality of time captures the memory effects inherent in the radon diffusion process.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 6","pages":"2165 - 2172"},"PeriodicalIF":1.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of nanoparticles on pool boiling and critical heat flux 纳米颗粒对池沸腾和临界热流密度的影响

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-09 DOI: 10.1007/s12648-024-03407-w

T. Srinivas, P. Adarsh Varma, Ch. Satya Priya, M. Prashanth, P. Mukesh, B. Sai Sri Nandan, G. Srinivas

{"title":"The effects of nanoparticles on pool boiling and critical heat flux","authors":"T. Srinivas, P. Adarsh Varma, Ch. Satya Priya, M. Prashanth, P. Mukesh, B. Sai Sri Nandan, G. Srinivas","doi":"10.1007/s12648-024-03407-w","DOIUrl":"10.1007/s12648-024-03407-w","url":null,"abstract":"<div>The use of nanofluids, which are aqueous fluids containing nanoparticles, facilitates the ability to increase the critical heat flux (CHF) of a system. This study conducted pool boiling experiments at 50 °C and atmospheric pressure to examine the CHF features of CuO nanoparticles, Al2O3 nanoparticles, and a hybrid of Al2O3 and CuO colloids. Ni–Cr wire is used as the primary heating element. The concentrations of nanoparticles in the base fluid varied between 0.1 and 0.5 percent by weight, with each increase representing a doubling of the previous value. From a low of roughly 2%, the critical heat flow climbed by around 19% in each of the test conditions. The appearance of a nanofluid on the heating surface, which enhances surface wettability, is associated with an increase in CHF. The accumulation of nanoparticles on the surface of the heater also contributes to the increase in CHF. After attaining a peak at 17% at 0.2 weight%, the rate of CHF enhancement shown by hybrid nanofluid began to fall. These findings have important applications in thermal management systems used in nuclear reactors, electronics cooling, and other high-heat flow scenarios.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1509 - 1518"},"PeriodicalIF":1.6,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating the dynamics, synchronization of a novel chaotic system reduced from a modified KdV–Burgers–Kuramoto equation 研究了一种由改进的KdV-Burgers-Kuramoto方程简化而成的新型混沌系统的动力学、同步

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-09 DOI: 10.1007/s12648-024-03434-7

Junbiao Guan, Feng Wang

引用次数: 0

Notes on some analytically solvable generalized constant-roll inflation models 几个可解析解的广义常滚膨胀模型的注释

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-08 DOI: 10.1007/s12648-024-03339-5

Sin Chol Hwang, Kwi Jong Ko, Myong Yun

引用次数: 0

Structural and optical properties of lead sulfide thin films prepared by RF-sputtering technique 射频溅射法制备硫化铅薄膜的结构和光学性能

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-07 DOI: 10.1007/s12648-024-03458-z

Maha M. Alalwan, Mahmoud H. Saleh, Mahmoud H. Abu-Kharma

{"title":"Structural and optical properties of lead sulfide thin films prepared by RF-sputtering technique","authors":"Maha M. Alalwan, Mahmoud H. Saleh, Mahmoud H. Abu-Kharma","doi":"10.1007/s12648-024-03458-z","DOIUrl":"10.1007/s12648-024-03458-z","url":null,"abstract":"<div>In the present investigation, we explored the structural and optical properties of lead sulfide (PbS) thin films deposited on glass substrates. For this purpose, the radio frequency (RF) sputtering technique was applied and the films were studied at different substrate temperatures (25–200 °C). The crystallography and microstructure of the aforementioned films were measured utilizing x-ray diffraction (XRD) and scanning electron microscopy (SEM), and the optical properties using a UV–VIS spectrophotometer. The XRD results demonstrated that all the films are polycrystalline with an FCC crystal structure and a preferred orientation along the (111) plane. It has been found that the measured lattice constants closely match the theoretical values. The crystallite size increases with substrate temperature within the range of 100–200 °C. The optical properties of the films were studied by recording the transmittance spectrum in the range (350–1100 nm) and analyzed using the Pointwise Unconstrained Minimization Approach (PUMA) program. The films reveal a reduced transmittance with rising temperature from 25 to 150 °C. It was also observed that the refractive index (n) and extinction coefficient (κ) decrease with rising wavelength. Additionally, the absorption coefficient (α) was found to increase with higher photon energy. Using Tauc’s relationship, the optical band gap (({E}_{g})) was determined. The results indicated that ({E}_{g}) decreases with substrate temperature, the former ranging between 2.36 and 2.64 eV. </div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 6","pages":"2287 - 2294"},"PeriodicalIF":1.6,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study of phase transitions in the mixed-spin (1,3/2) Ashkin-Teller model with two competing dynamics 具有两个竞争动力学的混合自旋（1,3/2）Ashkin-Teller模型相变的数值研究

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-07 DOI: 10.1007/s12648-024-03470-3

S. I. V. Hontinfinde, M. F. Gbede, M. Karimou, V. A. Kpadonou, F. Hontinfinde

引用次数: 0

Thermodynamic properties of a delta quantum dot under an electromagnetic field: the Nikiforov-Uvarova approach 电磁场下delta量子点的热力学性质：Nikiforov-Uvarova方法

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-06 DOI: 10.1007/s12648-024-03467-y

Maurice Tiotsop, Soh Fongang Donald Bradonne, Alain Jervé Fotue

{"title":"Thermodynamic properties of a delta quantum dot under an electromagnetic field: the Nikiforov-Uvarova approach","authors":"Maurice Tiotsop, Soh Fongang Donald Bradonne, Alain Jervé Fotue","doi":"10.1007/s12648-024-03467-y","DOIUrl":"10.1007/s12648-024-03467-y","url":null,"abstract":"<div>In this study, we explore the thermodynamic aspects of a delta quantum dot (ΔQD) under the influence of electric and magnetic fields. By applying the Nikiforov-Uvarov approach, we derive essential thermodynamic parameters of the system, including its free energy, entropy, heat capacity, and magnetization. Understanding these properties is vital for grasping quantum dot nanostructures' dynamics and intrinsic qualities subjected to external field forces. We present detailed results and thorough discussions of the derived thermodynamic parameters, revealing their dependence on temperature and magnetic field strength. The results show a pseudo-harmonic pattern in the entropy of a delta quantum dot system, indicating distinct regimes, potential phase transitions, and their involvement in quantum coherence. Our findings shed light on the intricate interplay between electric and magnetic fields, providing valuable insights into the thermodynamic behavior of ΔQDs. This study contributes to the broader understanding of quantum dots and their potential applications in future technological advancements.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 5","pages":"1815 - 1824"},"PeriodicalIF":1.6,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing photonic response diversity in STO heterostructures with varying orientations 不同取向STO异质结构的光子响应多样性评价

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-05 DOI: 10.1007/s12648-024-03456-1

Anshu Gupta, Bibek Ranjan Satapathy, Ajit Singh, Amit Vashisht, Chandan Bera, Suvankar Chakraverty

引用次数: 0

Physical and electrochemical characterizations of erbium-doped tetraborate Li1.9Er0.1B4O7 掺铒四硼酸锂（Li1.9Er0.1B4O7）的物理和电化学表征

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-11-05 DOI: 10.1007/s12648-024-03460-5

A. L. Benmaiza, R. Belhoucif, A. Mahieddine, M. Trari

{"title":"Physical and electrochemical characterizations of erbium-doped tetraborate Li1.9Er0.1B4O7","authors":"A. L. Benmaiza, R. Belhoucif, A. Mahieddine, M. Trari","doi":"10.1007/s12648-024-03460-5","DOIUrl":"10.1007/s12648-024-03460-5","url":null,"abstract":"<div>Lithium tetraborate has received great attention due to its use in optical devices and solid batteries. The Er3+ doped lithium tetraborate (LTB-10%Er) was synthesized by solid-state reaction. The single-phase crystallizes in a tetragonal symmetry and a crystallite size of 66.4 nm was determined from the Williamson-Hall (W–H) plot. The Scanning Electron Microscopy shows irregularly shaped grains with sizes ranging from 0.4 to 2 μm. The presence of BO3 and BO4 units in the crystal structure and molecular associations were confirmed by attenuated total reflectance and Raman spectroscopy. X-ray Photoelectron Spectroscopy analysis allowed us to determine the chemical composition and valence states of LTB-10%Er, confirming the successful insertion of Er3+ into the Li+ site. A direct optical transition at 3.23 eV was determined by UV–visible spectrophotometry. The electrochemistry of the doped sample is studied for the first time; the n-type behavior is evidenced from the positive slope of the characteristic “Capacitance−2–Potential (C−2–E)” in the electrolytic solution (Na2SO4, 0.1 M). The flat band potential (Efb = 0.29 VSCE) is close to the photocurrent triggering potential (Eon = 0.22 VSCE), indicating the absence of sub-band states in the band gap. The combined optical/electrochemical properties allowed to calculate the valence band (+ 2.56 VSCE/7.31 eVvacuum) potentials formed by the orbital O2−: 2p and conduction band (−0.67 VSCE/4.08 eVvacuum).</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 6","pages":"2115 - 2123"},"PeriodicalIF":1.6,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High temperature dependent absorber-emitter pair nanostructure metamaterial matched with low band-gap PV cell for solar thermo photovoltaic application 高温依赖吸收-发射对纳米结构超材料与低带隙光伏电池匹配的太阳能热光伏应用

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-10-24 DOI: 10.1007/s12648-024-03446-3

Tesfaye Feyisa, Abebe Belay, Fekadu Tolessa, Gemechis Mathewos, Jebel Haji, Umer sherefedin

{"title":"High temperature dependent absorber-emitter pair nanostructure metamaterial matched with low band-gap PV cell for solar thermo photovoltaic application","authors":"Tesfaye Feyisa, Abebe Belay, Fekadu Tolessa, Gemechis Mathewos, Jebel Haji, Umer sherefedin","doi":"10.1007/s12648-024-03446-3","DOIUrl":"10.1007/s12648-024-03446-3","url":null,"abstract":"<div>One of the metamaterial concepts is the integration of selective broad-band thermal emitters with broad-band solar absorption, which is the foundation of technology that is effectively coupled to a photovoltaic cell for power generation. In this study, we investigated a solar thermo photovoltaic system with a selective absorber and emitter pair that achieves high absorptance of solar radiation in the visible and near-infrared regions (0.3–2.4 μm) that targets an InGaAsSb PV cell with a band gap energy of 0.52 eV. For this work, we designed a selective solar absorber nanostructured grating composed of a tungsten ground film and a hafnium dioxide spacer. Since the absorber melting point is high, it exhibits good thermal stability and extremely high intensity, with a weighted average solar absorption efficiency of 99% at AM1.5. At normal incidence, the optimized metamaterial absorber/emitter has a potential average thermal emitter of more than 94% in the cutoff wavelength range (0.3–2.4 μm) and a total thermal emittance of less than 2% in the mid-infrared range (> 2.4 μm) at a temperature of 100 °C (373 K). According to the simulation results, the estimated total solar-to-heat conversion efficiency is 95% at 373 K without an optical concentration. On the other hand, the total solar-to-heat conversion efficiency is 92 and 62% at 973 K with an optical concentration of 100 suns and 10 suns, respectively. Furthermore, the designed absorber/emitter has thermal stability, polarization independent and exhibits good emissivity over a wide range of incidence angles from 0° to 75°. Finally, to analyze the impact of geometric parameters on the performance of solar absorptivity and thermal emissivity, metamaterial structures with different sizes, shapes and thicknesses were optimized.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 6","pages":"2053 - 2067"},"PeriodicalIF":1.6,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0