Physica Scripta最新文献_第6页

Influence of Ca-substituted K-induced cluster defects on the electronic structure and optical properties of KDP crystals Ca 取代 K 引发的团簇缺陷对 KDP 晶体电子结构和光学特性的影响

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad75c6

Longfeng Zhao, Wei Hong, Tingyu Liu, Hao Hu and Jiachen Zhu

引用次数: 0

Adsorption, photocatalysis, and sonocatalytic activities of LaFeO3/methylcellulose/multi-walled carbon nanotubes-NiCu2O4/Zn for removal of organic pollutant: preparation, main factor, and mechanism 用于去除有机污染物的 LaFeO3/甲基纤维素/多壁碳纳米管-NiCu2O4/Zn 的吸附、光催化和声催化活性：制备、主要因素和机理

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad7708

Aneta Salova, Asad Syed, Rafid Kamal Jameel, Morug Salih Mahdi, Aseel Salah Mansoor, Usama Kadem Radi, Ameer Hassan Idan, Hind A AL-Shwaiman, Manjula Subramaniam, Ling Shing Wong and Baadal Jushi Janani

{"title":"Adsorption, photocatalysis, and sonocatalytic activities of LaFeO3/methylcellulose/multi-walled carbon nanotubes-NiCu2O4/Zn for removal of organic pollutant: preparation, main factor, and mechanism","authors":"Aneta Salova, Asad Syed, Rafid Kamal Jameel, Morug Salih Mahdi, Aseel Salah Mansoor, Usama Kadem Radi, Ameer Hassan Idan, Hind A AL-Shwaiman, Manjula Subramaniam, Ling Shing Wong and Baadal Jushi Janani","doi":"10.1088/1402-4896/ad7708","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7708","url":null,"abstract":"The primary objective of this study was to create and analyze a new type of LaFeO3/methylcellulose/multi-walled carbon nanotubes-NiCu2O4/Zn nanocomposite, called LFO/MC/MWCNT-NCO/Z, which has multiple functions. Structural investigation using field emission scanning electron microscopy showed that the nanoparticles (40–50 nm) were evenly distributed throughout the nanocomposite, suggesting that they were successfully incorporated without any clumping. FTIR research verified the existence of functional groups that facilitate electrostatic interactions with contaminants, hence strengthening catalytic performance and improving adsorption efficiency. The BET analysis revealed a significantly high specific surface area of 72.61 m2/g, which greatly enhances its ability to adsorb substances. The nanocomposite demonstrated high removal efficiency in adsorption (74.55%), photocatalysis (68.19%), and sonocatalysis (91.22%) procedures, highlighting its potential for effectively removing bisphenol A as organic pollutants. The synthesized LFO/MC/MWCNT-NCO/Z nanocomposite shows great potential in effectively eliminating organic contaminants from water solutions. This offers a sustainable way to address water pollution and protect human health and the environment.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"5 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199346","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

Improved Chua’s chaotic system with a novel memristor: generating multi-scroll hidden attractors and applications in image encryption 利用新型忆阻器改进蔡氏混沌系统：生成多卷隐吸引子并应用于图像加密

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad76e3

Pengfei Ding, Juan Zhang and Jingge Zhu

{"title":"Improved Chua’s chaotic system with a novel memristor: generating multi-scroll hidden attractors and applications in image encryption","authors":"Pengfei Ding, Juan Zhang and Jingge Zhu","doi":"10.1088/1402-4896/ad76e3","DOIUrl":"https://doi.org/10.1088/1402-4896/ad76e3","url":null,"abstract":"In this paper, a new method for generating multi-scroll chaotic attractors by introducing a new memristor model into an improved Chua’s system is presented. The dynamic characteristics of the system are analyzed, including equilibria and stability, bifurcation diagrams, Lyapunov exponents and phase diagrams. Strikingly, it can exhibit three-scroll, four-scroll and five-scroll hidden attractors by only changing one system parameter and different shapes of chaotic attractors coexist with the same parameter. Furthermore, the high randomness of the system is verified through 0–1 test and NIST test. By using the high randomness of the system, an image encryption algorithm (IEA) is designed to guarantee the secure and efficient transmission of digital images. This IEA uses whirlpool transformation to scramble pixel positions and DNA computation to diffuse pixel values. The simulation and performance analysis results indicate that the proposed IEA has high security and reliable encryption performance, which in turn confirms the availability of the new memristor-based Chua’s chaotic system.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"15 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199546","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

Heat transport in SiCOH thin films: an experimental and molecular dynamics study SiCOH 薄膜中的热传输：实验和分子动力学研究

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad76e2

Hu He

引用次数: 0

Developing novel wormhole metrics in finsler-randers geometry using the barthel connection and osculating-riemannian method 在芬斯勒-兰德斯几何中利用巴特尔连接和循环-里曼尼方法开发新的虫洞度量

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad7709

J Praveen and S K Narasimhamurthy

{"title":"Developing novel wormhole metrics in finsler-randers geometry using the barthel connection and osculating-riemannian method","authors":"J Praveen and S K Narasimhamurthy","doi":"10.1088/1402-4896/ad7709","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7709","url":null,"abstract":"In this research, we focus on modelling a wormhole using Finsler-Randers geometry. By applying the Barthel connection from the range of Finslerian connections, we have developed a new wormhole metric, termed the osculating Barthel-Finsler-Randers metric, through the osculating-Riemannian method within the Finsler-Randers framework. The fundamental field equations are formulated in terms of the obtained metric tensor characterised by η(r), which plays a pivotal role in characterizing the anisotropy of the model. To explore the application of Finsler geometry in addressing the existence of a wormhole, we adopt an exponential shape function. Further, in order to streamline the computational aspects of our analysis, and to discuss the effect of anisotropy effect of Finsler Rander geometry, we adopt a specific functional form for the anisotropic parameter where α is a constant with implications for the anisotropy, among various possibilities for η(r) a non-zero analytical component of vector field in Randers metric. In addition, we consider three distinct values for the exponent n = −1, 0, and 1 and subsequently, we proceed to develop two distinct models for each of these three values of n with constant and non-constant redshift function. We analyse the physical implications of η(r) on the energy conditions. Our results demonstrate the crucial impact of anisotropy on the stability and structure of wormholes, emphasizing the requirement of exotic matter under specific conditions. This research deepens the understanding of wormhole physics within Finsler geometry, shedding light on the theoretical frameworks essential for the existence and stability of these cosmic structures.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"29 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199347","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

The effect of oxidation on tribology behavior of nickel-graphite coated stainless steel SS420 氧化对镍石墨涂层不锈钢 SS420 摩擦学行为的影响

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad764a

Kourosh Shirvani, Morteza Taheri and Tahere Ebrahimi

{"title":"The effect of oxidation on tribology behavior of nickel-graphite coated stainless steel SS420","authors":"Kourosh Shirvani, Morteza Taheri and Tahere Ebrahimi","doi":"10.1088/1402-4896/ad764a","DOIUrl":"https://doi.org/10.1088/1402-4896/ad764a","url":null,"abstract":"The main solution to the challenge of maintaining maximum sealing in the compressor section of each gas turbine is the use of abradable coatings. These coatings have a double duty, including (a) maintaining the lagging and (b) protecting the tips of the rotor blades. Choosing the type of abradable coating primarily depends on the service temperature of the coating. Nickel-graphite (Ni-G) coating is a good choice for use up to 480 °C and, or steel/sub-alloy rotor blades. In this research, the Ni-G coating was applied by the flame spraying method of Ni-G powder with a thickness of about 250 μm on an SS420 stainless steel substrate. The effect of the composition of the bonding layer was also investigated using two compositions, Ni-5Al and NiCrAlY. Obtaining the knowledge of applying Ni-G coating by flame spraying, identifying the structural and compositional characteristics of the coating (through optical and electron metallography), and the effect that oxidation can have on the tribological behavior of the coating were among the goals of this project. The best conditions for spraying the Ni-G coating were achieved an oxygen gas pressure of 6 bar, oxygen flow rate of 18 L min−1, acetylene pressure of 1.5 bar, acetylene flow rate of 24 L min−1, and the distance between the gun head and the sample surface was 22 cm. The results showed that placing the coating in oxidizing conditions increases its coefficient of friction. The increase in the coefficient of friction was attributed to the formation of oxide shells on the surface of the coating after 500 h of exposure to oxidation conditions. Corresponding to the higher coefficient of friction, the oxidized coating showed a decrease in wear resistance as a result of oxidation. This result can show the decrease in abradable of this coating with increasing service time.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"36 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199543","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

Influence of sulfurization temperature on grain growth in Cu2ZnSnS4 thin films synthesized for solar cell applications 硫化温度对合成用于太阳能电池的 Cu2ZnSnS4 薄膜晶粒生长的影响

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad764c

Indu Gupta, Shivani Singla, Prakash Kanjariya, Rahul Jain, Bhaskar Chandra Mohanty and Manas Nayak

{"title":"Influence of sulfurization temperature on grain growth in Cu2ZnSnS4 thin films synthesized for solar cell applications","authors":"Indu Gupta, Shivani Singla, Prakash Kanjariya, Rahul Jain, Bhaskar Chandra Mohanty and Manas Nayak","doi":"10.1088/1402-4896/ad764c","DOIUrl":"https://doi.org/10.1088/1402-4896/ad764c","url":null,"abstract":"Copper-zinc-tin-sulfur (CZTS) thin films, prepared through a dip-coating solution method, present a highly attractive option as absorber materials for thin-film solar cells. This is due to their affordability, environmentally friendly composition, and abundant availability of raw materials. Although films processed with hydrazine-based solutions have achieved the highest efficiency of approximately 12.6%, the toxic and carcinogenic nature of hydrazine negates these advantages. In the ongoing global research on solution-based processing methods, the size of the grains has emerged as a critical factor in the fabrication of efficient solar cells. In our study, we have successfully prepared CZTS thin films with a pure kesterite phase, characterized by large micro-sized grains, using a dip-coating process with an ethanol-based precursor solution, followed by sulfurization. We investigated how the grain size evolves with varying sulfurization temperatures. Notably, we observed that increasing the temperature led to larger and more uniform grain growth. These results underscore the potential of our approach for the straightforward production of high-quality films with sizable grains, ultimately enhancing their photosensitivity and making them a promising candidate for efficient solar cell applications.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"26 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199544","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

An image encryption scheme based on an improved memristive neuron chaotic system 基于改进型记忆神经元混沌系统的图像加密方案

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad76e5

Yanzhang Wang

引用次数: 0

Conductively coupled terahertz metamaterials with dual functions of electromagnetically induced transparent and Fano effects for sensing applications 具有电磁诱导透明效应和法诺效应双重功能的传导耦合太赫兹超材料，可用于传感应用

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad7338

Yuxuan Chen, Yongzheng Sun, Weijun Zhou, Xuefeng Qin, Qian Zhao, Yueke Wang and Ben-Xin Wang

{"title":"Conductively coupled terahertz metamaterials with dual functions of electromagnetically induced transparent and Fano effects for sensing applications","authors":"Yuxuan Chen, Yongzheng Sun, Weijun Zhou, Xuefeng Qin, Qian Zhao, Yueke Wang and Ben-Xin Wang","doi":"10.1088/1402-4896/ad7338","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7338","url":null,"abstract":"A terahertz metamaterial structure consisting of two U-shaped split-ring resonators and a horizontal cut-line resonator is designed for realizing the electromagnetically induced transparency (EIT) effect and the Fano resonance effect. The genesis of the EIT and Fano resonance bifunctionality is illustrated by combining the near-field distribution analysis of transparent windows and transmission dips. Interestingly, the bifunctional dual-band transparency effect could transform into a single-functional single-band transparency effect when we change the position of the square metal sheet in the vertical direction of the composited terahertz metamaterial structure. In addition, based on the high-quality factor of Fano resonance response, the proposed bifunctional terahertz metamaterial device has good refractive index sensing sensitivity. These results indicate that our proposed terahertz metamaterial can provide guidance for the design of subsequent multifunctional and integrated metamaterials and optoelectronic devices.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"2013 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199547","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

Effective and efficient coded aperture cone-beam computed tomography via generative adversarial U-Net 通过生成式对抗 U-Net 实现有效和高效的编码孔径锥束计算机断层扫描

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-11 DOI: 10.1088/1402-4896/ad76e6

Tianyi Mao, Lei Liang, Caijie Gao, Chuanzhen Bian, Dongmiao Wang, Shujin Zhu and Xiubin Dai

{"title":"Effective and efficient coded aperture cone-beam computed tomography via generative adversarial U-Net","authors":"Tianyi Mao, Lei Liang, Caijie Gao, Chuanzhen Bian, Dongmiao Wang, Shujin Zhu and Xiubin Dai","doi":"10.1088/1402-4896/ad76e6","DOIUrl":"https://doi.org/10.1088/1402-4896/ad76e6","url":null,"abstract":"Coded aperture cone-beam computed tomography (CBCT) represents a crucial method for acquiring high-fidelity three-dimensional (3D) tomographic images while reducing radiation exposure. However, projections are non-uniformly and discontinuously sampled with the coded apertures placed in front of the x-ray source, leading to very small reconstruction scale and time-intensive iterations. In this study, an alternative approach to reconstruct coded aperture CBCT based on generative adversarial U-net is proposed to effectively and efficiently reconstruct large scale 3D CBCT images. Our method entails predicting complete and uniform projections from incomplete and non-uniform coded projections, enabling the requirement of continuity for the use of analytical algorithms in 3D image reconstruction. This novel technique effectively mitigates the traditional trade-off between image fidelity and computational complexity inherent in conventional coded aperture CBCT reconstruction methods. Our experimental results, conducted using clinical datasets comprising CBCT images from 102 patients at Nanjing Medical University, demonstrate that high-quality CBCT images with voxel dimensions of 400 × 400 × 400 can be reconstructed within 35 s, even when 95% of projections are blocked, yielding images with PSNR values exceeding 25dB and SSIM values surpassing 0.85.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"81 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199343","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