Indian Journal of Physics最新文献_第5页

Bioconvection-enhanced oblique motion of chemically reactive Oldroyd-B liquid over a convectively heated elastic surface 化学反应性奥尔德罗伊德-B 液体在对流加热的弹性表面上的生物对流增强斜运动

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-24 DOI: 10.1007/s12648-024-03377-z

Kotha Gangadhar, S. Venkata Krishna Sarma, M. Venkata Subba Rao, Abderrahim Wakif

{"title":"Bioconvection-enhanced oblique motion of chemically reactive Oldroyd-B liquid over a convectively heated elastic surface","authors":"Kotha Gangadhar, S. Venkata Krishna Sarma, M. Venkata Subba Rao, Abderrahim Wakif","doi":"10.1007/s12648-024-03377-z","DOIUrl":"https://doi.org/10.1007/s12648-024-03377-z","url":null,"abstract":"The present study focuses on the investigation of bioconvection applications, shedding light on the significant implications for environmentally friendly and sustainable ‘green’ fuel cell technologies. In this context, the study paves the way for further exploration of the Oldroyd-B fluid model in the presence of gyrotactic microorganisms. The analysis delves into the mixed convection of the Oldroyd-B fluid with gyrotactic microorganisms, exploring the effects of an elastic surface and magnetic field interactions. Notably, the study considers the influence of chemical reaction processes, convective heating, and thermal radiation, enhancing our understanding of these complex phenomena. The governing two-dimensional equations for motion, momentum, mass, and energy were normalized using nonlinear system-wide ordinary differential equations through appropriate transformation methods. The resulting solution for this intricate physical problem was obtained using the bvp4c method, and its validity was confirmed by comparing it with previously reported findings in the literature. The study indicates that higher porosity and magnetic parameters significantly influence velocity profiles. Meanwhile, the temperature profile improves, and the thermal field is enhanced by Brownian diffusion and radiation variables. Additionally, the Peclet number affects the density of microorganisms. Furthermore, an increase in thermophoresis significantly reduces the wall heat transfer rate for both radiation and non-radiation cases.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215886","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

Generalised transformation relations for superluminal particles in (3 + 1) dimensional system 3 + 1）维系统中超光速粒子的广义变换关系

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-22 DOI: 10.1007/s12648-024-03379-x

Vivek Kumar Srivastava, Alok Kumar Verma, Garima Vaish

{"title":"Generalised transformation relations for superluminal particles in (3 + 1) dimensional system","authors":"Vivek Kumar Srivastava, Alok Kumar Verma, Garima Vaish","doi":"10.1007/s12648-024-03379-x","DOIUrl":"https://doi.org/10.1007/s12648-024-03379-x","url":null,"abstract":"Here, we have proposed new transformation relations between two inertial frames with relative velocity greater than speed of light and discussed the required conditions to detect superluminal particles in the physical realm. A novel theoretical formulation is conceptualized to uniquely depict the frame of reference, valid for all ranges of velocities, in a complex plane. In the tachyonic regime, the super-relativistic gamma factor is obtained by parameterizing the generalised gamma factor using the complementary frames of reference of superluminal and subluminal spaces. The formulations of transformation relations have been analysed in four different classes, i.e., two inter and two intra classes of frames, for subluminal and superluminal particles. The intra classes of frames encompass real gamma factors, whilst, inter classes of frames involve imaginary gamma factors. These transformation relations in all four different classes are expressed in 4-vector form with their respective transformation matrices ((Lambda )) and are found to be invariant under the transformations. This invariancy has led to the establishment of relationships among the transformation factors in stationary and moving frames. The velocity 4-vector relations for subluminal and superluminal particles, both in moving and stationary frames, have been evaluated. The 4-velocity transformation relations between particle velocity in stationary and moving frames are also introduced by using the transformation matrices. Based on these 4-velocity transformations, relative velocity addition relations have been deduced and discussed corresponding to each of the transformation relations. The generalised gamma factor has been concluded and validated for both frames of reference.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215888","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

Ni doping in CZTS solar cells: a path to enhanced photovoltaic performance 在 CZTS 太阳能电池中掺杂镍：提高光伏性能的途径

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-22 DOI: 10.1007/s12648-024-03327-9

Makrand E. Sonawane, Ketan P. Gattu, Vishnu V. Kutwade, Dipak A. Tonpe, Faizan M. Khan, Sumaiyya Shaikh, Prakash S. Gajbar, Ramphal B. Sharma

{"title":"Ni doping in CZTS solar cells: a path to enhanced photovoltaic performance","authors":"Makrand E. Sonawane, Ketan P. Gattu, Vishnu V. Kutwade, Dipak A. Tonpe, Faizan M. Khan, Sumaiyya Shaikh, Prakash S. Gajbar, Ramphal B. Sharma","doi":"10.1007/s12648-024-03327-9","DOIUrl":"https://doi.org/10.1007/s12648-024-03327-9","url":null,"abstract":"The present communication explores the optical, structural, compositional, and electrical properties of Copper Zinc Tin Sulfide (CZTS) and Nickel (Ni)-CZTS solar cells. A microwave-based synthesis method has been employed to synthesize CZTS and Ni-doped CZTS powders. X-ray diffraction and Raman scattering spectroscopy have confirmed the monophase kesterite crystal structure of CZTS and Ni-CZTS. Optical absorption spectroscopy of films in the UV–Visible range displays a strong absorption coefficient of more than (10^{4} {text{cm}}^{ - 1}). In response to Ni doping, the optical band gap energy of CZTS decreased to 1.41 eV from 1.5 eV. In both samples, positive Hall coefficients were detected, confirming the presence of p-type conductivity. This study aims to determine the effects of Ni-CZTS incorporation on the performance of FTO/CZTS/CdS/ZnO/Ag solar cells. The introduction of Ni-CZTS between CZTS and CdS resulted in optimum alignment and higher efficiency. 5% Ni doping concentration is found to be the optimum doping concentration, resulting in (J_{sc} = 32.5;{text{mA}}/{text{cm}}^{2}), (V_{{{text{oc}}}} = 0.541;{text{V}}), ({text{FF}} = 31%) and the efficiency is 5.4%.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215887","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

Intense red emission from trivalent Eu3+ doped Ca9La(VO4)7 nanophosphor for lighting and latent fingerprinting applications 三价 Eu3+ 掺杂 Ca9La(VO4)7 纳米荧光粉发出的强红色光，用于照明和潜在指纹识别应用

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-20 DOI: 10.1007/s12648-024-03389-9

Diksha Solanki, Poonam Devi, Hina Dalal, Neeraj Sehrawat, Mukesh Kumar, Ojas Garg, Rajesh Kumar Malik

{"title":"Intense red emission from trivalent Eu3+ doped Ca9La(VO4)7 nanophosphor for lighting and latent fingerprinting applications","authors":"Diksha Solanki, Poonam Devi, Hina Dalal, Neeraj Sehrawat, Mukesh Kumar, Ojas Garg, Rajesh Kumar Malik","doi":"10.1007/s12648-024-03389-9","DOIUrl":"https://doi.org/10.1007/s12648-024-03389-9","url":null,"abstract":"A quick, efficient, and environment-friendly solution combustion approach was used to develop intense red light emitting Eu3+ activated Ca9La(VO4)7 nanophosphor. Rietveld’s refinement of patterns obtained from XRD validated the trigonal structure & (R3c 161 space group) of the crystallized nanophosphors. Elemental analysis and surface morphology of the red phosphors were investigated by EDAX and SEM techniques. Tauc’s theory was used to determine the band gap of the host & optimized nanosample. The excitation spectra at 331 nm indicate energy transfer between VO43− → Eu3+ ions, which is confirmed by photoluminescence lifetime measurements. The designated nanophosphors emit bright red light due to the 5D0 → 7F2 radiative transition. Dexter’s hypothesis and I–H model were used to demonstrate that dipole–dipole interactions are a true phenomenon for concentration quenching. Furthermore, the optical properties of Ca9La0.6Eu0.4(VO4)7 nanophosphor exhibit quantum efficacy (58.67%), CIE co-ordinates (0.5192, 0.3313), and color-temperature (1717 K), making it suitable for use in wLEDs, photonic devices and based on the previously mentioned results, the optimum (i.e. Ca9La(1-x)Eux(VO4)7 (x = 0.4 mol%)) nanophosphor was shown to be useful for LFP (latent fingerprinting).","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215902","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

Non-collinear equilibrium points in the perturbed restricted three-body problem with unstable elongated primary 具有不稳定拉长原基的扰动受限三体问题中的非共轭平衡点

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-18 DOI: 10.1007/s12648-024-03383-1

Ravi Kumar Verma, Badam Singh Kushvah

{"title":"Non-collinear equilibrium points in the perturbed restricted three-body problem with unstable elongated primary","authors":"Ravi Kumar Verma, Badam Singh Kushvah","doi":"10.1007/s12648-024-03383-1","DOIUrl":"https://doi.org/10.1007/s12648-024-03383-1","url":null,"abstract":"In this paper, we have studied the motion around the non-collinear equilibrium points in the perturbed circular restricted three-body problem. The bigger primary is considered a point mass, and the smaller primary is an unstable elongated primary. The unstable elongated primary refers to the elongated primary rotates about its centre point, i.e. at an instant, the line joining the two ends of the elongated primary and the x-axis makes an angle, (theta in [0,360^circ )). Computations of the non-collinear equilibrium points (L_{4,5}), and their linear stability, are investigated, and the results are applied to the Jupiter-Amalthea, Saturn-Prometheus and Pluto-Hydra systems. It is found that the positions of the non-collinear equilibrium points (L_{4,5}) remain unchanged with variation in the angle, (theta ), but small variation in the critical mass parameter, (mu _c) is observed. Variations of the critical mass, (mu _c), with different segment-length and its rotation are studied. Stable solutions around (L_4) are obtained in the systems of Jupiter-Amalthea, Saturn-Prometheus, and Pluto-Hydra using the established results.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215904","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

Analysis of Eu3+-ions concentration effect on the spectral properties of zinc-barium-boron-tellurite glasses 分析 Eu3+ 离子浓度对锌钡硼碲玻璃光谱特性的影响

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-17 DOI: 10.1007/s12648-024-03370-6

M. Shoaib, I. Khan, Safdar Khan, S. Mukamil, Ahmad A. Ifseisi, Mohamed E. Assal, F. Qiao, I. Ullah, S. A. Khattak, G. Rooh, J. Kaewkhao

{"title":"Analysis of Eu3+-ions concentration effect on the spectral properties of zinc-barium-boron-tellurite glasses","authors":"M. Shoaib, I. Khan, Safdar Khan, S. Mukamil, Ahmad A. Ifseisi, Mohamed E. Assal, F. Qiao, I. Ullah, S. A. Khattak, G. Rooh, J. Kaewkhao","doi":"10.1007/s12648-024-03370-6","DOIUrl":"https://doi.org/10.1007/s12648-024-03370-6","url":null,"abstract":"The present study aims to examine the concentration effect of Eu3+ ions in Boro Tellurite glass and how it affects its physicochemical and photo luminescent characteristics. Using the melt quenching method, a series of Boro-Telluride glasses with the composition (30-x) TeO2–30B2O3–10ZnO–30BaO–xEu2O3 (where x = 0.00, 0.05, 0.10, 0.50, 1.00, 1.50, 2.00, and 2.50 mol%) were synthesized. The results of the XRD analysis revealed that the prepared samples are amorphous. As the concentration of the Eu2O3 increases, the density and refractive index rise, but the molar volume decreases, indicating that the glass matrix has become more compact. Similarly, the absorption spectra and oscillator strength calculated with JO theory demonstrate the transition from 7F0 to 5L6 (in the UV–Vis region) and 7F0 to 5L6 (in the NIR region) is more intense. For TBZB–Eu7 glass, the phonon sideband energy is estimated to be 717 cm−1 and compared with the BGO scintillator, the integrated scintillation efficiency is estimated to be 16.14%. These findings demonstrate that the current glasses doped with 2 mol% Eu3+ exhibit strong luminescence qualities and can be used for portal imaging systems (MeV energies) non-destructive analysis such as industrial and medical X-ray imaging systems, and also have potential for laser application.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215912","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

Analysis of magnetotransport properties of layered magnetic structures using the Boltzmann approach 利用玻尔兹曼方法分析层状磁结构的磁传输特性

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-16 DOI: 10.1007/s12648-024-03388-w

Bassem Elsafi

引用次数: 0

Optical characterization of oxadiazoles analogues doped PMMA film for photonic application 用于光子应用的掺杂恶二唑类似物 PMMA 薄膜的光学表征

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-16 DOI: 10.1007/s12648-024-03386-y

Suraj Sunil Joshi, Vikas M. Shelar, A. H. Shridhar, Sikandar H. Dhannur, Moamen S. Refat, Amnah Mohammed Alsuhaibani, Lohit Naik

{"title":"Optical characterization of oxadiazoles analogues doped PMMA film for photonic application","authors":"Suraj Sunil Joshi, Vikas M. Shelar, A. H. Shridhar, Sikandar H. Dhannur, Moamen S. Refat, Amnah Mohammed Alsuhaibani, Lohit Naik","doi":"10.1007/s12648-024-03386-y","DOIUrl":"https://doi.org/10.1007/s12648-024-03386-y","url":null,"abstract":"In the present study, newly synthesized nitrobenzene derivatives (PBT and PBF) doped poly(methyl methacrylate) films were prepared using spin coating techniques, and their optical properties were analyzed. The absorption spectra of various weight percentages (0.02%, 0.1%, 0.2%, and 0.3%) of nitrobenzene derivative-doped polymer films were recorded using a UV–visible spectrometer. From the absorption spectra, optical properties such as refractive index, band gap energy, extinction coefficient, and dielectric constant were calculated. The effect of doping on the optical properties of PMMA was investigated, with results revealing normal dispersive behavior from the refractive index and extinction coefficient. Atomic force microscopy and scanning electron microscopy images indicated that the synthesized films have a low degree of roughness and a smooth surface. Additionally, the nonlinear optical properties of the PBF-doped polymer film were investigated, and the β value was determined to be 7.403 cm/W. Overall, the findings suggest that PBF-doped polymer films are promising candidates for photonic applications.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215901","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

Enhanced absorption in thin-film silicon solar cell using buried silver nanoparticles 利用埋银纳米粒子增强薄膜硅太阳能电池的吸收能力

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-15 DOI: 10.1007/s12648-024-03387-x

Mohammad Ismaeel Zare Davijani, Abdollah Abbasi, Hassan Khalesi

引用次数: 0

Tunable band-pass plasmonic waveguide-filter in the near infrared region 近红外区域的可调谐带通等离子波导滤波器

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-13 DOI: 10.1007/s12648-024-03371-5

Ghasem KhosroBeygi, Mohammad Reza Jafari, Mehran Shahmansouri

引用次数: 0