Pub Date : 2024-08-09DOI: 10.1088/1402-4896/ad69d7
E. Zayed, K. Alurrfi, Abeer M M Hasek, N. Arar, A. Arnous, Y. Yıldırım
This article represents a significant advancement in the understanding of highly dispersive optical solitons within the context of optical metamaterials, leveraging a generalized form of Kudryashov’s law of refractive index. By integrating eighth-order dispersion and multiplicative white noise into the analysis, crucial elements in the development and optimization of sophisticated optical metamaterials are accounted for in this current paper for the first time. Through an improved direct algebraic method, a diverse range of soliton solutions are derived, encompassing bright, dark, singular, and straddled solitons. Moreover, the study goes beyond mere derivation by presenting exact solutions expressed using Jacobi and Weierstrass’s elliptic functions. This mathematical framework offers deeper insights into the dynamics of solitons within the investigated context. These findings substantially expand the theoretical underpinnings governing optical solitons in metamaterials, with direct implications for the design, and implementation of next-generation optical devices. The bridging of theoretical advancements with practical applications underscores the significance of this work. By elucidating precise control over soliton properties, it lays the groundwork for innovative solutions in optical communications and beyond. Also, this research serves as a crucial stepping stone towards realizing the full potential of optical metamaterials in shaping the future of optical technologies.
{"title":"Novel highly dispersive soliton solutions in couplers for optical metamaterials: leveraging generalized Kudryashov’s Law of refractive index with eighth-order dispersion and multiplicative white noise","authors":"E. Zayed, K. Alurrfi, Abeer M M Hasek, N. Arar, A. Arnous, Y. Yıldırım","doi":"10.1088/1402-4896/ad69d7","DOIUrl":"https://doi.org/10.1088/1402-4896/ad69d7","url":null,"abstract":"\u0000 This article represents a significant advancement in the understanding of highly dispersive optical solitons within the context of optical metamaterials, leveraging a generalized form of Kudryashov’s law of refractive index. By integrating eighth-order dispersion and multiplicative white noise into the analysis, crucial elements in the development and optimization of sophisticated optical metamaterials are accounted for in this current paper for the first time. Through an improved direct algebraic method, a diverse range of soliton solutions are derived, encompassing bright, dark, singular, and straddled solitons. Moreover, the study goes beyond mere derivation by presenting exact solutions expressed using Jacobi and Weierstrass’s elliptic functions. This mathematical framework offers deeper insights into the dynamics of solitons within the investigated context. These findings substantially expand the theoretical underpinnings governing optical solitons in metamaterials, with direct implications for the design, and implementation of next-generation optical devices. The bridging of theoretical advancements with practical applications underscores the significance of this work. By elucidating precise control over soliton properties, it lays the groundwork for innovative solutions in optical communications and beyond. Also, this research serves as a crucial stepping stone towards realizing the full potential of optical metamaterials in shaping the future of optical technologies.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"12 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-09DOI: 10.1088/1402-4896/ad6da7
Jie Yang, Xiang Yan
Triphotons have a more abundant energy structure compared to biphotons. Furthermore, as the number of photons increases, excellent properties such as entangled multi-qubit states, high security, flexibility, and information capacity are observed. This leads to a growing demand for multi-body quantum information processing. Here, a method is proposed to generate a three-photon entangled state using a single six-wave mixing process in an atomic ensemble. The research examines the temporal correlation characteristics of the triphoton produced in photon coincidence counting measurements, with a focus on the linear and nonlinear susceptibilities of the six-wave mixing process. These properties primarily depend on the fifth-order nonlinear coupling coefficients responsible for the damping Rabi oscillations and the group delay determined by the longitudinal detuning function. To enhance the nonlinear interaction between the optical field and the atomic ensemble, placing the atomic ensemble in a high-quality cavity and utilizing laser cooling techniques to eliminate the internal Doppler broadening effect in the atomic gas hold promise.
{"title":"Generation of a tripartite photonic state via a double-Λ configuration in a four-level system","authors":"Jie Yang, Xiang Yan","doi":"10.1088/1402-4896/ad6da7","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6da7","url":null,"abstract":"\u0000 Triphotons have a more abundant energy structure compared to biphotons. Furthermore, as the number of photons increases, excellent properties such as entangled multi-qubit states, high security, flexibility, and information capacity are observed. This leads to a growing demand for multi-body quantum information processing. Here, a method is proposed to generate a three-photon entangled state using a single six-wave mixing process in an atomic ensemble. The research examines the temporal correlation characteristics of the triphoton produced in photon coincidence counting measurements, with a focus on the linear and nonlinear susceptibilities of the six-wave mixing process. These properties primarily depend on the fifth-order nonlinear coupling coefficients responsible for the damping Rabi oscillations and the group delay determined by the longitudinal detuning function. To enhance the nonlinear interaction between the optical field and the atomic ensemble, placing the atomic ensemble in a high-quality cavity and utilizing laser cooling techniques to eliminate the internal Doppler broadening effect in the atomic gas hold promise.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"9 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-09DOI: 10.1088/1402-4896/ad6da5
Mohamed Rabia, A. Ben Gouider Trabelsi, F. Alkallas, A. Elsayed
A novel nanocomposite, MoS3-MoO3/poly-O-amino-benzenethiol (MoS3-MoO3/POABT), has been synthesized in a one-pot process and demonstrates promising applications as a material for a two-electrode configuration supercapacitor. This nanocomposite exhibits remarkable morphological characteristics, featuring uniform particles with an average diameter of 80 nm and a porous structure. The advantageous morphology contributes to the enhanced performance of the fabricated pseudo supercapacitor. The evaluation of the charge/discharge behavior and cyclic voltammetry curves pertaining to the redox reaction of the MoS3-MoO3/POABT nanocomposite reveals its efficacy as a supercapacitor material. The specific capacitance (CS) achieved for this fabricated supercapacitor is noteworthy at 152 F/g. Furthermore, the energy density (E) peaks at 12.6 W h kg-1 when operating at a current density of 0.2 A/g. This high energy density demonstrates the supercapacitor's ability to store significant energy for practical use efficiently. Importantly, its stability remains strong, with an impressive 98% retention after 250 cycles, and even after 1000 cycles, it only slightly decreases to 95%. This remarkable stability over extended cycling periods underscores the durability of the materials in the supercapacitor. Such reliable performance establishes the MoS3-MoO3/POABT nanocomposite as a dependable choice for supercapacitor applications, ensuring longevity and consistent performance in diverse energy storage needs.
{"title":"Symmetric two-electodes pseudosupercapacitor from Trichalcogenide MoS3-MoO3-poly-O-amino-benzenethiol nanocomposite","authors":"Mohamed Rabia, A. Ben Gouider Trabelsi, F. Alkallas, A. Elsayed","doi":"10.1088/1402-4896/ad6da5","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6da5","url":null,"abstract":"\u0000 A novel nanocomposite, MoS3-MoO3/poly-O-amino-benzenethiol (MoS3-MoO3/POABT), has been synthesized in a one-pot process and demonstrates promising applications as a material for a two-electrode configuration supercapacitor. This nanocomposite exhibits remarkable morphological characteristics, featuring uniform particles with an average diameter of 80 nm and a porous structure. The advantageous morphology contributes to the enhanced performance of the fabricated pseudo supercapacitor. The evaluation of the charge/discharge behavior and cyclic voltammetry curves pertaining to the redox reaction of the MoS3-MoO3/POABT nanocomposite reveals its efficacy as a supercapacitor material. The specific capacitance (CS) achieved for this fabricated supercapacitor is noteworthy at 152 F/g. Furthermore, the energy density (E) peaks at 12.6 W h kg-1 when operating at a current density of 0.2 A/g. This high energy density demonstrates the supercapacitor's ability to store significant energy for practical use efficiently. Importantly, its stability remains strong, with an impressive 98% retention after 250 cycles, and even after 1000 cycles, it only slightly decreases to 95%. This remarkable stability over extended cycling periods underscores the durability of the materials in the supercapacitor. Such reliable performance establishes the MoS3-MoO3/POABT nanocomposite as a dependable choice for supercapacitor applications, ensuring longevity and consistent performance in diverse energy storage needs.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"25 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d12
D. M. Torres-Herrera, Olaf Ramires-Iturbe, Rosa Nava-Sanchez, Arturo Morales-Acevedo
Perovskite-based solar cells (PSCs) have demonstrated remarkable high power conversion efficiency in recent years. However, the use of mono-organic cations (such as Methylammonium or Formamidinium) limits the potential for large-scale development due to potential degradation under environmental conditions. The incorporation of multi-cations has emerged as a strategy to enhance both performance and stability. The cesium (Cs) cation represents a solid alternative for partial substitution of Formamidinium. However, the initial concentration of precursors in the solution is often reported without establishing the final concentration of the cation present in the thin films. Herein, the incorporation of Cs cations into the FAPbI3 structure to produce a CsxFA(1-x)PbI3 perovskite with different values of x using a one-step spin coating process is demonstrated. Assessing the structural and optical properties, it is demonstrated that CsxFA(1-x)PbI3 films behave according to Vegard's law for values of x between 0 and 0.66. In particular, CsxFA(1-x)PbI3, with an x concentration of 0.33 exhibits a cubic lattice parameter of 6.28 Å, lower than that for FAPbI3 but higher than that for CsPbI3. This concentration showed stability of the dark phase under ambient conditions for extended periods. In addition, this material has a bandgap of 1.5 eV, making it suitable for use in solar cells.
近年来，基于过氧化物的太阳能电池（PSCs）已显示出显著的高功率转换效率。然而，由于单有机阳离子（如甲基铵或甲脒铵）在环境条件下可能会降解，因此限制了大规模开发的潜力。加入多阳离子已成为一种提高性能和稳定性的策略。铯（Cs）阳离子是部分替代甲脒的可靠选择。然而，通常只报告溶液中前驱体的初始浓度，而不确定薄膜中阳离子的最终浓度。在此，我们利用一步旋涂工艺将铯阳离子掺入 FAPbI3 结构中，生成了具有不同 x 值的 CsxFA(1-x)PbI3 包晶。在对结构和光学特性进行评估后发现，当 x 值介于 0 和 0.66 之间时，CsxFA(1-x)PbI3 薄膜的行为符合维加定律。特别是，当 x 浓度为 0.33 时，CsxFA(1-x)PbI3 的立方晶格参数为 6.28 Å，低于 FAPbI3，但高于 CsPbI3。在这种浓度下，暗相在环境条件下长时间保持稳定。此外，这种材料的带隙为 1.5 eV，适合用于太阳能电池。
{"title":"On the Vegard’s law compliance for CsxFA(1-x)PbI3 perovskite thin films","authors":"D. M. Torres-Herrera, Olaf Ramires-Iturbe, Rosa Nava-Sanchez, Arturo Morales-Acevedo","doi":"10.1088/1402-4896/ad6d12","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d12","url":null,"abstract":"\u0000 Perovskite-based solar cells (PSCs) have demonstrated remarkable high power conversion efficiency in recent years. However, the use of mono-organic cations (such as Methylammonium or Formamidinium) limits the potential for large-scale development due to potential degradation under environmental conditions. The incorporation of multi-cations has emerged as a strategy to enhance both performance and stability. The cesium (Cs) cation represents a solid alternative for partial substitution of Formamidinium. However, the initial concentration of precursors in the solution is often reported without establishing the final concentration of the cation present in the thin films. Herein, the incorporation of Cs cations into the FAPbI3 structure to produce a CsxFA(1-x)PbI3 perovskite with different values of x using a one-step spin coating process is demonstrated. Assessing the structural and optical properties, it is demonstrated that CsxFA(1-x)PbI3 films behave according to Vegard's law for values of x between 0 and 0.66. In particular, CsxFA(1-x)PbI3, with an x concentration of 0.33 exhibits a cubic lattice parameter of 6.28 Å, lower than that for FAPbI3 but higher than that for CsPbI3. This concentration showed stability of the dark phase under ambient conditions for extended periods. In addition, this material has a bandgap of 1.5 eV, making it suitable for use in solar cells.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"16 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d07
Baljinder Kaur, S. A. Khandy, S. Dhiman, Munirah D. Albaqami, Kulwinder Kaur
The thermoelectric properties of Sn2SSe are investigated via band engineering using Ge alloying. In this work, the electronic and thermoelectric properties of Sn2SSe doped with Ge at different concentrations (x=0, 0.25, 0.5, 0.75, and 1) are investigated using density functional theory and Boltzmann transport theory. At 300K, the Seebeck coefficient and electrical conductivity are enhanced with Ge alloying from -960μV/K to -1535 μV/K and from 3.4 ×105 S/cm to 4.1 ×105 S/cm respectively. However, the lowest value of lattice thermal conductivity is observed at 700K which is 2.7W/mK. At x=1, A remarkably high ZT value 1.7 is achieved at 700 K for Sn2(1−x)Ge2(x)SSe. The high ZT value is 1.8 times greater than pure compound.
{"title":"Thermoelectric properties of Sn2SSe via band engineering with Ge alloying","authors":"Baljinder Kaur, S. A. Khandy, S. Dhiman, Munirah D. Albaqami, Kulwinder Kaur","doi":"10.1088/1402-4896/ad6d07","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d07","url":null,"abstract":"\u0000 The thermoelectric properties of Sn2SSe are investigated via band engineering using Ge alloying. In this work, the electronic and thermoelectric properties of Sn2SSe doped with Ge at different concentrations (x=0, 0.25, 0.5, 0.75, and 1) are investigated using density functional theory and Boltzmann transport theory. At 300K, the Seebeck coefficient and electrical conductivity are enhanced with Ge alloying from -960μV/K to -1535 μV/K and from 3.4 ×105 S/cm to 4.1 ×105 S/cm respectively. However, the lowest value of lattice thermal conductivity is observed at 700K which is 2.7W/mK. At x=1, A remarkably high ZT value 1.7 is achieved at 700 K for Sn2(1−x)Ge2(x)SSe. The high ZT value is 1.8 times greater than pure compound.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"6 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d18
Khurrem Shehzad, Jun Wang, Muhammad Arshad, Madiha Ghamkhar
This paper investigates wave solutions and electromagnetic wave phenomena governed by the (3+1)-dimensional extended Zakharov–Kuznetsov equation (EZKE) utilizing the Sardar sub-equation method. With a focus on electromagnetic wave generation and propagation, we rigorously analyze fundamental properties, soliton solutions, and dynamic behaviors of the EZKE. Through this analytical technique, we unravel the complex interplay among various wave types, including solitary waves and electromagnetic structures, elucidating their formation mechanisms and interaction dynamics. Furthermore, we delve into the stability characteristics of the EZKE, enhancing our understanding of its mathematical and physical implications. Our findings not only contribute to theoretical insights into nonlinear wave phenomena in (3+1)-dimensional space but also hold practical significance in plasma physics, nonlinear optics, and electromagnetic wave propagation. This study advances the development of innovative wave manipulation and control techniques, with applications ranging from plasma confinement in fusion devices to the design of advanced photonic devices for telecommunications and sensing purposes.
{"title":"Electromagnetic effects on solitons propagation of the (3+1)-dimensional extended Zakharov–Kuznetsov dynamical model with applications","authors":"Khurrem Shehzad, Jun Wang, Muhammad Arshad, Madiha Ghamkhar","doi":"10.1088/1402-4896/ad6d18","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d18","url":null,"abstract":"\u0000 This paper investigates wave solutions and electromagnetic wave phenomena governed by the (3+1)-dimensional extended Zakharov–Kuznetsov equation (EZKE) utilizing the Sardar sub-equation method. With a focus on electromagnetic wave generation and propagation, we rigorously analyze fundamental properties, soliton solutions, and dynamic behaviors of the EZKE. Through this analytical technique, we unravel the complex interplay among various wave types, including solitary waves and electromagnetic structures, elucidating their formation mechanisms and interaction dynamics. Furthermore, we delve into the stability characteristics of the EZKE, enhancing our understanding of its mathematical and physical implications. Our findings not only contribute to theoretical insights into nonlinear wave phenomena in (3+1)-dimensional space but also hold practical significance in plasma physics, nonlinear optics, and electromagnetic wave propagation. This study advances the development of innovative wave manipulation and control techniques, with applications ranging from plasma confinement in fusion devices to the design of advanced photonic devices for telecommunications and sensing purposes.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"62 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141926874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d13
Fernando Eleazar García-Ramírez, Achim Max Loske, Remy Avila
Today, shock waves are used to treat a wide variety of ailments. Consequently, there is a need to develop efficient methodologies for comparing and evaluating the pressure fields generated by different equipment. Hydrophones are commonly utilized for accurate pressure measurements although they can be damaged by pitting due to acoustic cavitation. Furthermore, the range of measurement is limited by the position of the device. Optical methods have also been proposed since the presence of a disturbing device in the wave propagation medium is not necessary, and they provide a broader registering field. Nevertheless, these methods do not provide accurate measurements compared with those obtained with polyvinylidene difluoride or fiber-optic hydrophones. Herein, an optical method for shock wave characterization based on diffraction analysis, that can lead to more precise results, is proposed. The phase fluctuations of a light wave produced when it traverses the shock wave pressure field are calculated. The diffraction patterns produced by this perturbed wave at an observation plane at different propagation distances are presented. Considering the state of the art of high-speed cameras, we conclude that an experimental setup, based on the results reported here, can contribute to the evaluation and comparison of shock wave generators for medical applications.
{"title":"Simulations of the optical diffraction patterns produced by the pressure field of a clinical shock wave source","authors":"Fernando Eleazar García-Ramírez, Achim Max Loske, Remy Avila","doi":"10.1088/1402-4896/ad6d13","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d13","url":null,"abstract":"\u0000 Today, shock waves are used to treat a wide variety of ailments. Consequently, there is a need to develop efficient methodologies for comparing and evaluating the pressure fields generated by different equipment. Hydrophones are commonly utilized for accurate pressure measurements although they can be damaged by pitting due to acoustic cavitation. Furthermore, the range of measurement is limited by the position of the device. Optical methods have also been proposed since the presence of a disturbing device in the wave propagation medium is not necessary, and they provide a broader registering field. Nevertheless, these methods do not provide accurate measurements compared with those obtained with polyvinylidene difluoride or fiber-optic hydrophones. Herein, an optical method for shock wave characterization based on diffraction analysis, that can lead to more precise results, is proposed. The phase fluctuations of a light wave produced when it traverses the shock wave pressure field are calculated. The diffraction patterns produced by this perturbed wave at an observation plane at different propagation distances are presented. Considering the state of the art of high-speed cameras, we conclude that an experimental setup, based on the results reported here, can contribute to the evaluation and comparison of shock wave generators for medical applications.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d0e
Saeed Ullah, Xinge Liu, Adil Waheed, Shuailei Zhang, Shan Li
With the increasing frequency of data exchange, the security of transmitted information, especially images, has become paramount. This paper proposes a novel algorithm for encrypting grayscale images of any dimension by using a proposed fractional-order (FO) 4D hyperchaotic system, 2D Henon chaotic map permutation, and the knight tour algorithm. Initially, chaotic sequences are generated by utilizing the proposed FO 4D hyperchaotic system, which are later employed to rearrange and shuffle the entire image pixels to bolster the efficacy of image encryption. To introduce an additional layer of diffusion, 2D Henon chaotic map permutation is used. Furthermore, the knight tour algorithm is applied by starting from a chosen point and executing specified rounds on the scrambled image to increase the encryption's robustness. The resultant image encryption algorithm undergoes thorough testing and evaluation. It exhibits high sensitivity to the encryption key and boasts a larger key space, rendering it more resistant to brute-force attacks. The proposed algorithm demonstrates an approximate correlation of 0 between adjacent pixels. Further, encryption of a grayscale image of size 256×256 takes approximately 0.4 seconds, rendering it more suitable for cryptographic purposes.
{"title":"Novel grayscale image encryption based on 4D fractional-order hyperchaotic system, 2D Henon map and knight tour algorithm","authors":"Saeed Ullah, Xinge Liu, Adil Waheed, Shuailei Zhang, Shan Li","doi":"10.1088/1402-4896/ad6d0e","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d0e","url":null,"abstract":"\u0000 With the increasing frequency of data exchange, the security of transmitted information, especially images, has become paramount. This paper proposes a novel algorithm for encrypting grayscale images of any dimension by using a proposed fractional-order (FO) 4D hyperchaotic system, 2D Henon chaotic map permutation, and the knight tour algorithm. Initially, chaotic sequences are generated by utilizing the proposed FO 4D hyperchaotic system, which are later employed to rearrange and shuffle the entire image pixels to bolster the efficacy of image encryption. To introduce an additional layer of diffusion, 2D Henon chaotic map permutation is used. Furthermore, the knight tour algorithm is applied by starting from a chosen point and executing specified rounds on the scrambled image to increase the encryption's robustness. The resultant image encryption algorithm undergoes thorough testing and evaluation. It exhibits high sensitivity to the encryption key and boasts a larger key space, rendering it more resistant to brute-force attacks. The proposed algorithm demonstrates an approximate correlation of 0 between adjacent pixels. Further, encryption of a grayscale image of size 256×256 takes approximately 0.4 seconds, rendering it more suitable for cryptographic purposes.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"13 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d03
W. Adress, William Graham
Comparison and validation of different methods for the measurements of plasma gas temperature were studied. The investigations depend on optical emission spectroscopy OES, laser scattering technique, and line-broadening mechanisms. The rotational temperature of the second positive system SPS (C3 ∏+u - B3 ∏+g) around 380 nm, second positive system SPS at 337.1 nm of nitrogen molecule (C3 ∏+u - B3 ∏+g), and first negative system FNS at 391.4 nm of nitrogen ion (B2Σu+→X2Σg+) were investigated. Moreover, Raman scattering spectra at 532 nm were used to measure the gas temperature in the plasma jet. Gas temperature from the emission line broadening method was also calculated. The role of non-thermal plasma in assisting NOx reduction over an Ag/Al2O3 catalyst at low temperatures using simulated diesel fuels was confirmed. Importantly, a significant activity of both NOx and hydrocarbons oxidation was observed and obtained at low gas temperatures. It was found that there is a clear correlation between the gas temperature and the conversion efficiency of the catalyst under different operating conditions of the plasma reactor. The main objective of this investigation was to confirm the important role of the non-thermal plasma in catalyst activation at low gas temperatures compared to traditional thermal activation.
{"title":"A comparative study of gas temperature determination in non-thermal atmospheric pressure plasma jet by spectral analysis and scattering technique for plasma-catalyst measurements","authors":"W. Adress, William Graham","doi":"10.1088/1402-4896/ad6d03","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d03","url":null,"abstract":"\u0000 Comparison and validation of different methods for the measurements of plasma gas temperature were studied. The investigations depend on optical emission spectroscopy OES, laser scattering technique, and line-broadening mechanisms. The rotational temperature of the second positive system SPS (C3 ∏+u - B3 ∏+g) around 380 nm, second positive system SPS at 337.1 nm of nitrogen molecule (C3 ∏+u - B3 ∏+g), and first negative system FNS at 391.4 nm of nitrogen ion (B2Σu+→X2Σg+) were investigated. Moreover, Raman scattering spectra at 532 nm were used to measure the gas temperature in the plasma jet. Gas temperature from the emission line broadening method was also calculated. The role of non-thermal plasma in assisting NOx reduction over an Ag/Al2O3 catalyst at low temperatures using simulated diesel fuels was confirmed. Importantly, a significant activity of both NOx and hydrocarbons oxidation was observed and obtained at low gas temperatures. It was found that there is a clear correlation between the gas temperature and the conversion efficiency of the catalyst under different operating conditions of the plasma reactor. The main objective of this investigation was to confirm the important role of the non-thermal plasma in catalyst activation at low gas temperatures compared to traditional thermal activation.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"25 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d19
Shiqing Wang, Yi Zhang, Guodong Wen, J. Qi, Wenyan Zhai, Wang Gao
In this study TC4/TC17 titanium alloy dissimilar joints were obtained via vacuum electron beam welding. The compressivebehavior of base metals and joint at different strain levels was studied, along with microstructural and fracture surface observations. The true stress-strain curves of base metals and joint at different strains demonstrated smooth and continuous plastic deformation characteristics. The compressive yield strength of the joint was basically equivalent to that of TC17 alloy, which was significantly higher than that of TC4 alloy. However, the compressive fracture strain of the joint was lower than that of base metals. Comparison of the microstructures of base metals and joint deformed at different strains, it revealed that the equiaxed α phase in TC4 alloy mainly underwent the deformation, while the TC17 alloy mainly relied on the rotation of lamellar grains to resist the deformation. In the dissimilar joint with a large microstructural gradient, the compressive deformation of several zones, including the weld zone, far heat-affected zone and the base metal, was also related to the rotation of finer grains.
{"title":"Compressive behavior and deformation mechanisms of gradient microstructures in a dissimilar welded joint","authors":"Shiqing Wang, Yi Zhang, Guodong Wen, J. Qi, Wenyan Zhai, Wang Gao","doi":"10.1088/1402-4896/ad6d19","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d19","url":null,"abstract":"\u0000 In this study TC4/TC17 titanium alloy dissimilar joints were obtained via vacuum electron beam welding. The compressivebehavior of base metals and joint at different strain levels was studied, along with microstructural and fracture surface observations. The true stress-strain curves of base metals and joint at different strains demonstrated smooth and continuous plastic deformation characteristics. The compressive yield strength of the joint was basically equivalent to that of TC17 alloy, which was significantly higher than that of TC4 alloy. However, the compressive fracture strain of the joint was lower than that of base metals. Comparison of the microstructures of base metals and joint deformed at different strains, it revealed that the equiaxed α phase in TC4 alloy mainly underwent the deformation, while the TC17 alloy mainly relied on the rotation of lamellar grains to resist the deformation. In the dissimilar joint with a large microstructural gradient, the compressive deformation of several zones, including the weld zone, far heat-affected zone and the base metal, was also related to the rotation of finer grains.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"8 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：