Indian Journal of Physics最新文献_第9页

The radial scalar power potential and its application to quarkonium systems 径向标量幂势及其在夸克鎓系统中的应用

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-17 DOI: 10.1007/s12648-024-03335-9

Etido P. Inyang, N. Ali, R. Endut, N. Rusli, S. A. Aljunid

引用次数: 0

Micro-Raman spectroscopy of graphene defects and tracing the oxidation process caused by UV exposure 石墨烯缺陷的微拉曼光谱分析以及紫外线照射引起的氧化过程追踪

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-15 DOI: 10.1007/s12648-024-03338-6

Somayeh Gholipour, Maryam Bahreini, Mohamad Reza Jafarfard

{"title":"Micro-Raman spectroscopy of graphene defects and tracing the oxidation process caused by UV exposure","authors":"Somayeh Gholipour, Maryam Bahreini, Mohamad Reza Jafarfard","doi":"10.1007/s12648-024-03338-6","DOIUrl":"https://doi.org/10.1007/s12648-024-03338-6","url":null,"abstract":"Raman spectroscopy is a widely used method for the analysis of various samples, including carbon-based materials. This study aimed to identify the number of layers and defects in graphene using micro-Raman spectroscopy. More specifically, this study examined the oxidation process of graphene under UV exposure. An investigation of the effect of the power density of the Raman excitation laser revealed a linear dependence between the ratio of I2D/IG and the power density of the excitation laser. Additionally, the absence of peak D due to the increase in power density provides evidence for the nondestructive nature of micro-Raman spectroscopy. Given the value of I2D/IG, one of the parameters for determining the number of layers in graphene, which reaches 1.39 at the edge, the findings indicate the possibility of an edge fold of single-layer graphene. During the oxidation process, the intensity and position of the D peak increase as a function of exposure time. Alterations in the graphene Raman spectrum, comprising the disappearance of the 2D peak and the appearance of the D peak, trace and confirm the oxidation process of the sample.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"6 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141722355","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

Equilibrium description of thermodynamics in f(R, T) gravity f(R, T) 引力下的热力学平衡描述

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-15 DOI: 10.1007/s12648-024-03132-4

Sudabeh Akbarpour, Akram S. Sefiedgar

{"title":"Equilibrium description of thermodynamics in f(R, T) gravity","authors":"Sudabeh Akbarpour, Akram S. Sefiedgar","doi":"10.1007/s12648-024-03132-4","DOIUrl":"10.1007/s12648-024-03132-4","url":null,"abstract":"<div>The f(R, T) gravity as a modified theory of gravity is considered to study the Friedmann–Robertson–Walker (FRW) universe. We consider the case (f(R,T)=f_1(R)+2f_2(T)), where (f_1(R)) is an arbitrary function of Ricci scalar and (f_2(T)) is an arbitrary function of the trace of the energy-momentum tensor. Using the usual field equations, the conservation equation does not hold. However, we can redefine the field equations to satisfy the conservation equation. In this paper, we show that the FRW universe, as a closed system, may have a conserved 4-momentum if we assume an interaction between matter and the dark energy component coming from (f_2(T)). The rate of the energy transfer between the ordinary matter and the dark energy component induced by (f_2(T)) is obtained. Then, we derive the first law of thermodynamics by using the field equations and the standard entropy-area law on the apparent horizon. It is shown that there is an equality between the Friedmann equation and the first law of thermodynamics. One can also find an equilibrium description of thermodynamics in f(R, T) gravity. In addition, we investigate the validity of the generalized second law of thermodynamics. It is shown that the generalized second law of thermodynamics is always satisfied in the FRW universe.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 12","pages":"4217 - 4223"},"PeriodicalIF":1.6,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141647010","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 study of perturbation in magnetized Schwarzschild anti-de Sitter spacetime and dark energy profile 磁化施瓦兹柴尔德反德西特时空的扰动和暗能量剖面研究

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-13 DOI: 10.1007/s12648-024-03286-1

Muhammad Saad Ghafar, Farhad Ali, Saqib Hussain, Nahid Fatima, Maryam Alghafli

{"title":"The study of perturbation in magnetized Schwarzschild anti-de Sitter spacetime and dark energy profile","authors":"Muhammad Saad Ghafar, Farhad Ali, Saqib Hussain, Nahid Fatima, Maryam Alghafli","doi":"10.1007/s12648-024-03286-1","DOIUrl":"https://doi.org/10.1007/s12648-024-03286-1","url":null,"abstract":"We are going to investigate the geodesic motion of charged particles in the vicinity of Schwarzschild anti-de-Sitter (S-AdS) spacetime with topological defects that admit temporal perturbation. We used the approximate Noether symmetry equation to insert the time conformal factor in the black hole without losing its symmetry structure. This type of insertion is necessary because the black hole radiates its energy and momentum in the form of gravitational waves and Hawking radiation. Along with the temporal perturbation, the S-AdS black hole (BH) is immersed in an external magnetic field. We conduct an in-depth examination of the dynamics of charged particles near a weakly magnetized and time conformal S-AdS BH. Our analysis involves calculating the shift in the position of the innermost circular orbit (ISCO) caused by both temporal perturbation and the presence of a magnetic field. Furthermore, we explore the influence of dark energy (DE) and angular momentum on the stability of these orbits. Additionally, we determine the effective force and escape velocity for a charged particle orbiting around the perturbed magnetized S-AdS BH. The application of time-dependent perturbation theory can extend our understanding to investigate the quasinormal modes (QNMs) of BH mergers.\u0000","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"13 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614429","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

A Study on the influence of different HTL and ETL layers on the performance of a P3HTI $$C_{60}$$ BA bulk heterojunction organic solar cell 不同 HTL 层和 ETL 层对 P3HTI $$C_{60}$ BA 体异质结有机太阳能电池性能影响的研究

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-13 DOI: 10.1007/s12648-024-03278-1

C. D. Ramabadran, K. S. Sudheer

{"title":"A Study on the influence of different HTL and ETL layers on the performance of a P3HTI $$C_{60}$$ BA bulk heterojunction organic solar cell","authors":"C. D. Ramabadran, K. S. Sudheer","doi":"10.1007/s12648-024-03278-1","DOIUrl":"https://doi.org/10.1007/s12648-024-03278-1","url":null,"abstract":"In photovoltaic research, bulk heterojunction organic solar cells have garnered significant interest as light harvesters. This increased attention underscores the importance of advance research in organic solar cell development. The present study considers an organic bulk heterojunction solar cell with P3HT:IC(_{60})BA as the active layer. Simulation studies are conducted using SCAPS 1D software. Initially, the software is standardized by comparing the experimental data of the solar cell structure, ITO/PEDOT:PSS/P3HT:IC(_{60})BA/ZnONPS/Al with the simulated characteristics of the solar cell. Subsequently simulation research is done to evaluate the impact of different hole transport layers (HTL) and electron transport layers (ETL) on device performance.The HTL materials considered in this study include PEDOT:PSS, CuI, and Cu(_{2}O) while the ETL materials include ZnO NPs, Sn(O_{2}), Ti(O_{2}), IGZO and PCBM. According to the results, the cell structure employing Cu(_{2}O) as the HTL and IGZO as the ETL performed better than all other combinations. The cell structure is further optimized to analyze the impact of material parameters on device performance.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"17 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614430","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

Relativistic minisuperspaces in Finslerian background 芬斯勒背景下的相对论超小空间

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-13 DOI: 10.1007/s12648-024-03318-w

S. S. De, Farook Rahaman, Antara Mapdar

引用次数: 0

Analysis of ground and space geoelectric field during geomagnetic storms over Fresno, CA USA: wavelet coherence approach 美国加利福尼亚州弗雷斯诺上空地磁风暴期间的地面和空间地球电场分析：小波相干方法

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-12 DOI: 10.1007/s12648-024-03328-8

A. Giri, B. Adhikari, C. Idosa, D. Pandit

{"title":"Analysis of ground and space geoelectric field during geomagnetic storms over Fresno, CA USA: wavelet coherence approach","authors":"A. Giri, B. Adhikari, C. Idosa, D. Pandit","doi":"10.1007/s12648-024-03328-8","DOIUrl":"https://doi.org/10.1007/s12648-024-03328-8","url":null,"abstract":"The solar wind interacts with the earth magnetosphere and ionosphere, causing disturbances that create geoelectric fields in the Earth’s surface. These geoelectric fields link magnetospheric and ionospheric events, affecting the near-Earth environment. In the present study, we analyzed the ground- and space-based geoelectric field over Fresno, California, USA during three geomagnetic storms of different intensities, 19th February 2014 (moderate event), 17th March 2015 (intense event), and 17th March 2016 (weak event). We employed time series analysis and wavelet coherence analysis (WTC) to analyze fluctuations and investigate the strength of association and phase relationship between time series data of geomagnetic storms and geoelectric fields. We observed that ground-based magnetic and electric field fluctuations exhibited a distinct trend compared to space-based observations. WTC indicates that Ey (Space based Electric field) exhibits comparatively more enhanced power regions with solar parameters than EYt (Ground based elecrtic field). This is attributed to the impact of solar winds, which affect the ground electric field but have a less significant effect on the electric field in space.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"38 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141609476","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

Study of relativistic charged particle production using multi-source thermal model and emission feature of slowest target protons 利用多源热模型和最慢目标质子的发射特征研究相对论带电粒子的产生

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-10 DOI: 10.1007/s12648-024-03332-y

Kajal Attri, M. K. Singh, P. K. Khandai

引用次数: 0

Realisation of cosmic inflation under the purview of f(Q) gravity with agegraphic fluid 在带有年龄流体的 f(Q) 引力范围内实现宇宙膨胀

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-10 DOI: 10.1007/s12648-024-03321-1

Gargee Chakraborty

引用次数: 0

Design of hybrid metagrating microstructures with high efficiency and large angle focusing 设计具有高效率和大角度聚焦的混合偏光微结构

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-08 DOI: 10.1007/s12648-024-03330-0

Bin Lou, Guoping Yao, Fuyi Cui, Xufeng Jing, Chenxia Li

{"title":"Design of hybrid metagrating microstructures with high efficiency and large angle focusing","authors":"Bin Lou, Guoping Yao, Fuyi Cui, Xufeng Jing, Chenxia Li","doi":"10.1007/s12648-024-03330-0","DOIUrl":"https://doi.org/10.1007/s12648-024-03330-0","url":null,"abstract":"The traditional gradient metasurface is limited on the low efficient focusing for designed metalens due to the small angle steering. Generally, metasurface has advantage for controlling beams at the small angles, but there are low efficiency at larger angles. In order to improve the focusing efficiency of the gradient metasurface lens, a hybrid metagrating design scheme is proposed, in which the gradient metasurface structure is used in the central region of the lens, and the metagrating structure is used in the edge of the lens. The electric field distribution and diffraction characteristics of the gradient metasurface are demonstrated. The element structure of the metagrating is designed with asymmetric type to suppress the unnecessary diffraction order, so that the outgoing light energy propagates along the expected direction. In order to verify whether hybrid metagratings can improve the focusing effect, we compared the electric field distribution of hybrid metagratings and conventional gradient metasurface lenses and discuss their focusing effect. It is found that the focusing effect of hybrid metagrating is improved by 8% compared with the traditional gradient metasurface lens.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"13 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141577856","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