Physica Scripta最新文献

Regression modeling of Bödewadt slip flow dynamics involving Reiner-Rivlin nanofluid based on a modified Buongiorno approach 基于改进的布昂尼奥尔诺方法的涉及赖纳-里夫林纳米流体的博德瓦特滑移流动动力学回归建模

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad78c1

Tayyaba Ibrahim, M Mustafa, Junaid Ahmad Khan and Ammar Mushtaq

{"title":"Regression modeling of Bödewadt slip flow dynamics involving Reiner-Rivlin nanofluid based on a modified Buongiorno approach","authors":"Tayyaba Ibrahim, M Mustafa, Junaid Ahmad Khan and Ammar Mushtaq","doi":"10.1088/1402-4896/ad78c1","DOIUrl":"https://doi.org/10.1088/1402-4896/ad78c1","url":null,"abstract":"Regression models are useful in analyzing rotational flows as they enable accurate predictions of wall shear and heat transfer coefficient. In addition, Bödewadt flow is of paramount importance in fluid dynamics of rotating systems such as turbomachinery and geophysical flows. Moreover, nanofluid’s enhanced heat transfer properties can improve cooling efficiency in applications involving turbines and electronic systems. This study delves into the Bödewadt boundary layer flow of a Reiner-Rivlin fluid containing nanoparticles over a stationary porous disk under slip conditions. The two-phase Buongiorno model is employed, incorporating temperature-dependent diffusion coefficients for enhanced accuracy. To facilitate numerical simulations, the transport equations are converted into an ordinary differential system comprising four unknowns. In the present work, a highly reliable Keller-Box methodology is adopted which agrees very well with the MATLAB built-in program ‘bvp4c’. The computed 2-D and 3-D streamlines vividly capture the Bödewadt flow scenario with Reiner-Rivlin nanofluid. The principle aim to investigate the impact of non-Newtonian behaviour and slip on the flow pattern, while also examining the behavior of temperature/concentration field for nanoparticle working fluids. As thermophoretic diffusion increases, the thermal boundary layer thickens considerably, leading to a notable decrease in the cooling rate of the disk. In contrast, Brownian diffusion has only a minimal impact on the heat transport. In addition, wall suction effect is observed to significantly boost the disk’s cooling rate, though at the expanse of increasing skin friction coefficients. This study introduces linear and quadratic regression models designed to precisely predict both the surface drag and disk cooling rate, which are crucial factors in engineering processes.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Spin/valley dependent dwell time in an 8-Pmmn borophene junction 8-Pmmn 硼吩结中与自旋/谷值相关的停留时间

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7917

Farhad Sattari and Soghra Mirershadi

引用次数: 0

Memristor-coupled cubic hyperchaotic system, feedback synchronization and its application in image encryption Memristor 耦合立方超混沌系统、反馈同步及其在图像加密中的应用

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7918

Xiumei Cai, Xuan Yang, Chengmao Wu and Liping Song

引用次数: 0

Exceptional anisotropic superhydrophobicity of sword-lily striated leaf surface and soft lithographic biomimicking using polystyrene replica 剑莲条纹叶表面的特殊各向异性超疏水性以及利用聚苯乙烯复制品进行的软光刻生物仿真

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7549

Mahesh C Dubey and D Mohanta

{"title":"Exceptional anisotropic superhydrophobicity of sword-lily striated leaf surface and soft lithographic biomimicking using polystyrene replica","authors":"Mahesh C Dubey and D Mohanta","doi":"10.1088/1402-4896/ad7549","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7549","url":null,"abstract":"Herein, we report unusually high anisotropic superhydrophobicity, unidirectional self-cleaning, and biomimicking of adaxial sword-lily (Gladiolus hortulanus) leaf comprising three distinct levels of surface textures. Observably, the static anisotropic wetting and rolling of water droplets are more favourable in the parallel (or, striation) direction than in the perpendicular direction. Inspired from such water repellency of the sword lily leaf surface, here bio-mimicked polystyrene (PS) leaf construct is developed through a soft lithographic technique. Considering different water droplet sizes (4–10 μl) on natural lily leaf and bio-mimicked PS construct surfaces, the respective parallel (θ||) and perpendicular (θ⊥) water contact angles (WCAs) stand at, θ|| ∼143°–147°, θ⊥ ∼156°–169°; and θ|| ∼130°–139°, θ⊥ ∼142°–145°. Moreover, the specimens under study exhibit roll-off angles ranging, α|| ∼8°–23° (α⊥ ∼16°–41°) and α|| ∼21°–49° (α⊥ ∼40°–55°) along parallel (and perpendicular) directions; respectively. A noticeable difference in α⊥ and α|| values can be ascribed to the profound three-phase contact line (TCL) pinning along the perpendicular direction taking advantage of striation as means of barrier. The roll-off angles can also alter due to a variation in the droplet volume. The unusual anisotropic superhydrophobicity and unidirectional droplet roll-off can be attributed to the entrapped air within the micro-nano texture beneath the water droplet along with the pinning effect in the perpendicular direction caused by the striated heights.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Correcting the effect of temperature changes in the measurement results of dielectric response in power transformers as an arrhenius type dielectric with the help of artificial neural network 借助人工神经网络修正温度变化对作为阿伦尼乌斯型介质的电力变压器介电响应测量结果的影响

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad78c8

Seyed Amidedin Mousavi, Mehdi Bigdeli, Masoud Arfaei and Hossein Mohamadi

{"title":"Correcting the effect of temperature changes in the measurement results of dielectric response in power transformers as an arrhenius type dielectric with the help of artificial neural network","authors":"Seyed Amidedin Mousavi, Mehdi Bigdeli, Masoud Arfaei and Hossein Mohamadi","doi":"10.1088/1402-4896/ad78c8","DOIUrl":"https://doi.org/10.1088/1402-4896/ad78c8","url":null,"abstract":"Polarization and Depolarization Current (PDC) and Frequency Domain Spectroscopy (FDS) measurements are common dielectric response tests in time and frequency domain that are widely used to diagnosis insulation status in power transformer companies. Numerous factors affect the PDC and FDS test results, which the most important of them is temperature variation. To accurately interpret the results of the dielectric response, the effect of temperature on the results in time and frequency domains, must be corrected. In this paper, firstly a 200 MVA transformer is selected as a test object and FDS and PDC tests are performed on it at different temperatures. Then, based on the FDS results performed on a transformer at different temperatures, the parameters of the insulation model have been estimated by using genetic algorithm (GA). Next, with the help of artificial neural network (ANN), the parameters of the insulation model, related to the different temperatures are transferred into the reference parameters. After that, the parameters of the transferred insulation model, the FDS curves are plotted and transferred to the reference temperature curve and the effect of temperature on them is compensated. By using the correlation of the time and frequency domain results, with the help of transferred insulation model parameters, the PDC results are also plotted and transmitted on the reference PDC curve. Finally, with such a method, the effect of temperature on the PDC results is compensated.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Transfer of nonclassical correlations between bosonic field and atomic ensemble through electromagnetically induced transparency 通过电磁诱导透明度传递玻色场与原子集合之间的非经典相关性

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7894

Wanfang Liu, Chengyun Ding, Xunchang Yin and Liwei Zhang

{"title":"Transfer of nonclassical correlations between bosonic field and atomic ensemble through electromagnetically induced transparency","authors":"Wanfang Liu, Chengyun Ding, Xunchang Yin and Liwei Zhang","doi":"10.1088/1402-4896/ad7894","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7894","url":null,"abstract":"Dark state polariton, as an important concept in the mechanism of electromagnetic induced transparency (EIT), can map the state of bosonic fields to atomic ensembles. To reflect the mapping ability of dark state polariton, we choose the odd and even bosonic coherent states as the probe field in EIT process, and employ spin squeezing, entanglement, and quantum correlation to characterize nonclassical correlations of atomic ensembles during the manipulation of the driving field. It is shown that the differences between the odd and even coherent states are comprehensively reflected in the three characterizations of nonclassical correlations generated through dark state polaritons. The even bosonic coherent states can perfectly transfer bosonic squeezing into atomic ensembles, resulting in spin squeezing. Although the odd bosonic coherent states cannot induce the spin squeezing, they have an advantage over the even bosonic coherent states in generating quantum entanglement and quantum correlations. Furthermore, we demonstrate that atomic ensembles can achieve significant spin squeezing with squeezing degree ∝ 1/N2/3 through the one-axis twisting (OAT) model and two-axis twisting (TAT) model under the large N limit with the low excitation conditions, and the EIT mechanism was used to transfer the generated spin squeezing to the bosonic field, providing a feasible strategy for obtaining significant bosonic squeezing.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Exploring the influence of sudan IV Azo dye on the structural, optical, and dispersion characteristics of PVA/Su-IV composites 探索茚四酮偶氮染料对 PVA/Su-IV 复合材料结构、光学和分散特性的影响

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad79a2

A A Al-Muntaser, Eman Alzahrani, Abdu Saeed, S A Al-Ghamdi, Reem Alwafi, Hala M Abo-Dief and A Y Yassin

{"title":"Exploring the influence of sudan IV Azo dye on the structural, optical, and dispersion characteristics of PVA/Su-IV composites","authors":"A A Al-Muntaser, Eman Alzahrani, Abdu Saeed, S A Al-Ghamdi, Reem Alwafi, Hala M Abo-Dief and A Y Yassin","doi":"10.1088/1402-4896/ad79a2","DOIUrl":"https://doi.org/10.1088/1402-4896/ad79a2","url":null,"abstract":"Flexible polymeric film composites consisting of polyvinyl alcohol (PVA) and Sudan IV azo dye (Su-IV) were synthesized using a casting method. Despite the known optical properties of PVA and azo dyes individually, the combined effects of Su-IV doping in PVA on the material’s optical and nonlinear optical properties have not been thoroughly investigated. This study addresses this gap by exploring the interactions between PVA and Su-IV at various doping concentrations (0.1–0.8 wt%) and their subsequent impact on the material’s structural and optical characteristics. Fourier transform infrared (FTIR) spectroscopy was employed to identify distinct vibrational groups within the composites, revealing that the incorporation of Su-IV induced random deviations in most absorption intensities compared to pristine PVA. Notably, new peaks at 519 and 444 cm−1 emerged, intensifying with increasing Su-IV concentrations, indicating significant interactions between the composite constituents. The optical properties were analyzed through transmittance and reflectance measurements, which uncovered new absorption peaks at 518 and 357 nm in PVA/Su-IV composites. These peaks correspond to electronic energy transitions of 2.4 and 3.6 eV, respectively, and their intensities increased with higher Su-IV content. Additionally, the indirect and direct bandgaps were decreased as Su-IV concentrations increased. The refractive index (n) analysis showed typical dispersion behavior between 850 and 2500 nm, aligning with the Wemple-DiDomenico (WDD) model. Furthermore, the oscillator parameters were calculated. Also, the nonlinear optical susceptibility (χ(3)) was boosted from 4.19 × 10−6 for pure PVA to 3.60 × 10−4 for the sample with 0.8 wt% Su-IV. The nonlinear refractive index (n2) was also measured at 8.55 × 10−2 for the doped sample. These findings demonstrate the potential of PVA/Su-IV composites for applications in nonlinear optics and photonics.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142257482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Improving bidirectional controlled remote preparation of arbitrary number of qudits in noisy environment 改进嘈杂环境中任意数量量子点的双向可控远程制备

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad76e9

Si Jin, Songya Ma and Siyi Li

引用次数: 0

Resonances crossing and electric field quantum sensors* 共振交叉和电场量子传感器*

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad78c0

Andrea Sacchetti

引用次数: 0

Defect-induced localization of information scrambling in 1D Kitaev model 一维基塔耶夫模型中缺陷诱导的信息扰乱定位

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-18 DOI: 10.1088/1402-4896/ad7911

Varadharajan Muruganandam, Manas Sajjan and Sabre Kais

引用次数: 0