Pub Date : 2024-07-22DOI: 10.1088/1402-4896/ad6647
Pooja Narwat, Ashutosh Mishra
We report the field dependent magnetic and magnetoresistance (MR) properties of La2/3Sr1/3MnO3 (LSMO)/γ-Fe2O3/LSMO trilayer heterostructures and single layer LSMO film grown on SiO2/Si (100) substrates utilizing Pulsed Laser Deposition technique. The metal- insulator-metal configuration is a magnetic tunnel junction topology, which is a parallel network of two metallic layers (LSMO) and one insulating layer (γ-Fe2O3) in current-in-plane (CIP) geometry. The intrinsically inhomogeneous polycrystalline trilayer film shows much lower (almost half) coercivity, compared to single layer LSMO film. The MR-H [MR = (ρ (H)-ρ (0))/ρ (0)] behavior of the films is studied under two regimes namely, Low Field Magnetoresistance (LFMR) and High Field Magnetoresistance (HFMR) at 5 K and 300 K in the field range of 0-7 T. Several equations were developed to simulate the experimental MR-H data of the studied samples. For both the films, in the LFMR region (0 T
我们报告了利用脉冲激光沉积技术在二氧化硅/硅（100）基底上生长的 La2/3Sr1/3MnO3 (LSMO)/γ-Fe2O3/LSMO 三层异质结构和单层 LSMO 薄膜的磁场依赖性和磁阻（MR）特性。金属-绝缘体-金属构型是一种磁隧道结拓扑结构，是由两个金属层（LSMO）和一个绝缘层（γ-Fe2O3）组成的平行网络，其几何形状为 "面内电流"（CIP）。与单层 LSMO 薄膜相比，本质上不均匀的多晶三层薄膜显示出更低的（几乎一半的）矫顽力。在 5 K 和 300 K、0-7 T 的磁场范围内，研究了薄膜在低磁场磁阻 (LFMR) 和高磁场磁阻 (HFMR) 两种状态下的 MR-H [MR = (ρ (H)-ρ (0))/ρ (0)]行为。对于这两种薄膜，在 LFMR 区域（0 T < H ≤ 1 T @ 5 K），MR 随 H 的变化呈线性增加，随后在 HFMR 区域（1 T < H ≤ 7 T @ 5 K）呈对数变化。对于 CIP 几何形状的三层薄膜，在 5 K 和 1 T 磁场条件下，磁共振为负 16%，而 LSMO 单层在相同温度和磁场条件下，磁共振为负 13%。两层薄膜在高磁场（7 T）条件下的磁共振值相等，5 K 时为 38%，300 K 时为 15%。我们在电流垂直平面（CPP）配置下的三层薄膜获得了明显更好的磁共振-H 结果，其中两层金属层和一层绝缘层是串联的。在 CPP 配置中，5 K 和 1 T 磁场时的磁共振为 21%，而在 5 K 和 7 T 磁场时达到 44%。室温下，三层异质结构在 7 T 磁场条件下的磁共振为 17%。此外，MIM 器件的反平行和平行磁化状态在 CIP 和 CPP 几何结构中都得到了很好的体现。
{"title":"Isothermal magnetization and magnetoresistive variations in trilayer (La2/3Sr1/3MnO3/γ-Fe2O3/La2/3Sr1/3MnO3) hetero-structure","authors":"Pooja Narwat, Ashutosh Mishra","doi":"10.1088/1402-4896/ad6647","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6647","url":null,"abstract":"\u0000 We report the field dependent magnetic and magnetoresistance (MR) properties of La2/3Sr1/3MnO3 (LSMO)/γ-Fe2O3/LSMO trilayer heterostructures and single layer LSMO film grown on SiO2/Si (100) substrates utilizing Pulsed Laser Deposition technique. The metal- insulator-metal configuration is a magnetic tunnel junction topology, which is a parallel network of two metallic layers (LSMO) and one insulating layer (γ-Fe2O3) in current-in-plane (CIP) geometry. The intrinsically inhomogeneous polycrystalline trilayer film shows much lower (almost half) coercivity, compared to single layer LSMO film. The MR-H [MR = (ρ (H)-ρ (0))/ρ (0)] behavior of the films is studied under two regimes namely, Low Field Magnetoresistance (LFMR) and High Field Magnetoresistance (HFMR) at 5 K and 300 K in the field range of 0-7 T. Several equations were developed to simulate the experimental MR-H data of the studied samples. For both the films, in the LFMR region (0 T <H ≤ 1 T @ 5 K), the variation in MR exhibits a linear increase with H, followed by a logarithmic behavior in the HFMR region (1 T < H ≤ 7 T @5 K). For the trilayer film in CIP geometry, a negative MR of 16% is achieved at 5 K and 1 T field conditions, while LSMO single layer shows a negative MR of 13% at same temperature and field conditions. The MR obtained at high field (7 T) for both the films is quantitatively equal with a value of 38% @5 K and 15% @300 K. We obtained significantly better MR-H results for the trilayer in current-perpendicular-to-plane (CPP) configuration, where the two metallic layers and an insulating layer are in series. In the CPP configuration, MR is 21% @5 K and 1 T field, while it reached to 44% at 5 K and 7 T field. At room temperature, the trilayer heterostructure shows MR of 17% at 7 T field condition. At a higher field of 9 T, trilayer film in CPP mode exhibits MR value of 48% @5 K and 23%@300 K. Further, the anti-parallel and parallel magnetization states of the MIM device are well manifested in CIP and CPP geometries.\u0000","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"16 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141815654","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 : 2024-07-22DOI: 10.1088/1402-4896/ad664b
Miguel Ángel Mandujano, J. Villavicencio, R. Romo
We explore the dynamics of matter wave scattering in finite potential wells using analytical solutions of the Schr"odinger equation within the framework of a quantum shutter model. We find that the incident wave interferes with the bound states of the quantum well, resulting in time-domain oscillations. These oscillations exhibit Rabi-type frequencies, characterised by the energy differences between the incident wave and the bound states of the quantum well. We show that in systems with double-bound states, the interference pattern is characterised by quantum beats in the time-dependent probability density. The period of these beatings depends on the energy difference between the bound states, which can be tuned by controlling the potential parameters. In the general case where bound, anti-bound, and resonant states coexist in the system spectrum, complex oscillations in the probability density arise from the interactions of the incident wave with different quantum states. We demonstrate that the bound states sector can effectively describe this complex behaviour, providing a simple and reliable analytical expression for the probability density in multilevel systems. This formula highlights the significant role of bound states, whose interaction with the incident wave dominates the transient probability density. This contrasts with conventional systems with potential barriers and wells, where resonances govern the wave dynamics.
{"title":"Multilevel dynamics of matter waves scattering in finite potential wells","authors":"Miguel Ángel Mandujano, J. Villavicencio, R. Romo","doi":"10.1088/1402-4896/ad664b","DOIUrl":"https://doi.org/10.1088/1402-4896/ad664b","url":null,"abstract":"\u0000 We explore the dynamics of matter wave scattering in finite potential wells using analytical solutions of the Schr\"odinger equation within the framework of a quantum shutter model. We find that the incident wave interferes with the bound states of the quantum well, resulting in time-domain oscillations. These oscillations exhibit Rabi-type frequencies, characterised by the energy differences between the incident wave and the bound states of the quantum well. We show that in systems with double-bound states, the interference pattern is characterised by quantum beats in the time-dependent probability density. The period of these beatings depends on the energy difference between the bound states, which can be tuned by controlling the potential parameters. In the general case where bound, anti-bound, and resonant states coexist in the system spectrum, complex oscillations in the probability density arise from the interactions of the incident wave with different quantum states. We demonstrate that the bound states sector can effectively describe this complex behaviour, providing a simple and reliable analytical expression for the probability density in multilevel systems. This formula highlights the significant role of bound states, whose interaction with the incident wave dominates the transient probability density. This contrasts with conventional systems with potential barriers and wells, where resonances govern the wave dynamics.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"37 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141814920","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}
The advancement of quantum computation paves a novel way for addressing the issue of eigenstates. In this paper, two full quantum eigenvalue solvers based on quantum gradient descent are put forward. Compared to the existing classical-quantum hybrid approaches such as the variance-variational quantum eigenvalue solver, our method enables faster convergent computations on quantum computers without the participation of classical algorithms. As any eigenstate of a Hamiltonian has zero variance, this paper takes the variance as the objective function and utilizes the quantum gradient descent method to optimize it, demonstrating the optimization of the objective function on the quantum simulator. With the swift progress of quantum computing hardware, the two variance full quantum eigensolvers proposed in this paper are anticipated to be implemented on quantum computers, thereby offering an efficient and potent calculation approach for solving eigenstate problems. Employing this algorithm, we showcase 2 qubits of deuterium and hydrogen molecule. Furthermore, we numerically investigate the energy and variance of the Ising model in larger systems, including 3, 4, 5, 6, and 10 qubits.
{"title":"Full quantum eigensolvers based on variance","authors":"Ruo-Nan Li, Yuanhong Tao, Jin‐Min Liang, Shuhui Wu, Shao-Ming Fei","doi":"10.1088/1402-4896/ad664c","DOIUrl":"https://doi.org/10.1088/1402-4896/ad664c","url":null,"abstract":"\u0000 The advancement of quantum computation paves a novel way for addressing the issue of eigenstates. In this paper, two full quantum eigenvalue solvers based on quantum gradient descent are put forward. Compared to the existing classical-quantum hybrid approaches such as the variance-variational quantum eigenvalue solver, our method enables faster convergent computations on quantum computers without the participation of classical algorithms. As any eigenstate of a Hamiltonian has zero variance, this paper takes the variance as the objective function and utilizes the quantum gradient descent method to optimize it, demonstrating the optimization of the objective function on the quantum simulator. With the swift progress of quantum computing hardware, the two variance full quantum eigensolvers proposed in this paper are anticipated to be implemented on quantum computers, thereby offering an efficient and potent calculation approach for solving eigenstate problems. Employing this algorithm, we showcase 2 qubits of deuterium and hydrogen molecule. Furthermore, we numerically investigate the energy and variance of the Ising model in larger systems, including 3, 4, 5, 6, and 10 qubits.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"24 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141815669","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 : 2024-07-22DOI: 10.1088/1402-4896/ad6649
Taofiq Toyin Ibrahim, E. O. Oladimeji, D. J. Koffa, Helen Edogbanya, M. M. Gwani, J. F. Omonile
We present the bound state solutions of one-dimensional Schr"{o}dinger and Dirac equations for a particle confined in Woods-Saxon potential. In each case the wavefunctions and the energy eigenvalues have been obtained in terms of the Jacobi polynomials by using the Nikiforov-Uvarov method. The complex eigenenergy obtained from the Dirac equation is explicitly shown to contain the nonrelativistic energies plus complex relativistic correction terms. The quantum partition functions obtained using the relativistic and the nonrelativistic energies have been used to generate important thermodynamic properties of the system in the high temperature limit. In particular, the complex partition function obtained in the relativistic regime is taken to indicate some important physical effects in the system.
{"title":"Complex partition function of 1-dimensional Dirac particle confined in Woods-Saxon interaction","authors":"Taofiq Toyin Ibrahim, E. O. Oladimeji, D. J. Koffa, Helen Edogbanya, M. M. Gwani, J. F. Omonile","doi":"10.1088/1402-4896/ad6649","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6649","url":null,"abstract":"\u0000 We present the bound state solutions of one-dimensional Schr\"{o}dinger and Dirac equations for a particle confined in Woods-Saxon potential. In each case the wavefunctions and the energy eigenvalues have been obtained in terms of the Jacobi polynomials by using the Nikiforov-Uvarov method. The complex eigenenergy obtained from the Dirac equation is explicitly shown to contain the nonrelativistic energies plus complex relativistic correction terms. The quantum partition functions obtained using the relativistic and the nonrelativistic energies have been used to generate important thermodynamic properties of the system in the high temperature limit. In particular, the complex partition function obtained in the relativistic regime is taken to indicate some important physical effects in the system.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"28 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141814498","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 : 2024-07-22DOI: 10.1088/1402-4896/ad6644
Mufaddal Huzefa Shakir, A. Singh, Siddhartha Sharma
Natural fibers are becoming very popular as a reinforcement in composite materials owing to their benefits, such as low-price, lightweight, availability, and environmental friendliness. In this study, abaca fiber-reinforced polypropylene (PP) and high-density polyethylene (HDPE) composites were created with the help of the injection molding method. Prior to composite fabrication, abaca fibers were chemically treated with a 5 wt.% caustic soda (NaOH) solution to improve the bonding between the abaca fibers and the matrix and to enhance their properties. Scanning electron microscopy (SEM) was utilized to assess the fiber surface microstructures before as well as after the chemical treatment, along with the fractured surfaces of tensile specimens. The mechanical properties, such as tensile, bending, and impact strength, of abaca/PP and abaca/HDPE composites were evaluated and compared. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) methods were utilized to investigate the thermal behaviour of composites. Also, the dynamic mechanical analysis (DMA) method was utilized to explore the thermomechanical properties of the fabricated composites. The outcomes of the experimental findings showed that abaca/PP composite with 10 and 20 wt.% fibers is the best choice of material to be used in the automobile industry.
{"title":"Repercussion of Fiber Content on the Mechanical, Thermal, and Thermomechanical Properties of Natural Fibers Reinforced Thermoplastic Composites for Automotive Application","authors":"Mufaddal Huzefa Shakir, A. Singh, Siddhartha Sharma","doi":"10.1088/1402-4896/ad6644","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6644","url":null,"abstract":"\u0000 Natural fibers are becoming very popular as a reinforcement in composite materials owing to their benefits, such as low-price, lightweight, availability, and environmental friendliness. In this study, abaca fiber-reinforced polypropylene (PP) and high-density polyethylene (HDPE) composites were created with the help of the injection molding method. Prior to composite fabrication, abaca fibers were chemically treated with a 5 wt.% caustic soda (NaOH) solution to improve the bonding between the abaca fibers and the matrix and to enhance their properties. Scanning electron microscopy (SEM) was utilized to assess the fiber surface microstructures before as well as after the chemical treatment, along with the fractured surfaces of tensile specimens. The mechanical properties, such as tensile, bending, and impact strength, of abaca/PP and abaca/HDPE composites were evaluated and compared. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) methods were utilized to investigate the thermal behaviour of composites. Also, the dynamic mechanical analysis (DMA) method was utilized to explore the thermomechanical properties of the fabricated composites. The outcomes of the experimental findings showed that abaca/PP composite with 10 and 20 wt.% fibers is the best choice of material to be used in the automobile industry.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"13 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141817338","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 : 2024-07-22DOI: 10.1088/1402-4896/ad6641
Shafaat Hussain Mirza, Z. Abbas, Amna Parveen, Shoyebmohamad F. Shaikh
The properties of CeO2 thin films, such as their memory store capabilities, visual transparency, chemical and thermal durability, adjustable energy band topologies, and high oxygen storage capacity have captured the attention of scientists. The energy band dispersions for Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) are calculated to get insight into the characteristics of the materials under investigation. The anticipated energy bandgaps for Ce1-xCoxO2 and Ce1-xNixO2 are 2.6 and 2.7 eV, respectively, in the spin ↑ channel . However, both compounds show metallic character in in spin ↓ channel. The phenomena of photon absorption/dispersion by the host materials can be elucidated using dielectric function ε(ω) of Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%). Significant photon absorption can be noted in UV and IR regions for Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) in spin ↑ and spin ↓ channels, respectively. Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) exhibits a minimal photon reflection, approximately 15%. Ce1-xNixO2 shows excellent thermoelectric characteristics as its ZT value is high (1.8 at 1000K) compared to Ce1-xCoxO2. Based on their thermodynamic properties, Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) are thermodynamically stable compounds.
{"title":"First-principles quantum analysis of structural, optoelectronic, and thermophysical properties of Co/Ni doped ceria Ce1-xTmxO2 (Tm= Co, Ni) for solar cell applications","authors":"Shafaat Hussain Mirza, Z. Abbas, Amna Parveen, Shoyebmohamad F. Shaikh","doi":"10.1088/1402-4896/ad6641","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6641","url":null,"abstract":"\u0000 The properties of CeO2 thin films, such as their memory store capabilities, visual transparency, chemical and thermal durability, adjustable energy band topologies, and high oxygen storage capacity have captured the attention of scientists. The energy band dispersions for Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) are calculated to get insight into the characteristics of the materials under investigation. The anticipated energy bandgaps for Ce1-xCoxO2 and Ce1-xNixO2 are 2.6 and 2.7 eV, respectively, in the spin ↑ channel . However, both compounds show metallic character in in spin ↓ channel. The phenomena of photon absorption/dispersion by the host materials can be elucidated using dielectric function ε(ω) of Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%). Significant photon absorption can be noted in UV and IR regions for Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) in spin ↑ and spin ↓ channels, respectively. Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) exhibits a minimal photon reflection, approximately 15%. Ce1-xNixO2 shows excellent thermoelectric characteristics as its ZT value is high (1.8 at 1000K) compared to Ce1-xCoxO2. Based on their thermodynamic properties, Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) are thermodynamically stable compounds.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"28 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141814505","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 : 2024-07-22DOI: 10.1088/1402-4896/ad6646
Tai Zhao, Quanbing Zhang, Hao Tian, Yikang Jiang
As a kind of sensor for real-time feedback and dynamic monitoring of angular velocity and angular displacement of the system, the common photoelectric encoder is widely used in many fields such as new energy electric vehicles, servo closed-loop control systems, industrial control, security monitoring. In order to improve the resolution and accuracy, a kind of optical and magnetic combined encoder which combines photoelectricity and multi-pole magnetoelectricity is designed in this paper, where the light-blocking disk of photoelectric sensor is designed according to the pseudo-random sequence, and the photoelectric coding is used to determine the magnetic interval of multi-pole. The absolute angle is calculated according to the number of multiple circles plus the angle of single circle. The experimental results at different temperatures (−40 C~100 C) show that the accuracy of the proposed combined encoder can reach ±0.08°, which is improved by 0.37° compared with that of the single-pole encoder. Finally, the combined encoder was applied to the pan-tilt-zoom (PTZ) camera of a video surveillance enterprise, and the experiment showed that its repeated positioning accuracy reached ±0.02°, which is greatly improved compared with single-pole encoder.
{"title":"Research on high-precision encoder based on optical-magnetic combination structure to measure absolute angle","authors":"Tai Zhao, Quanbing Zhang, Hao Tian, Yikang Jiang","doi":"10.1088/1402-4896/ad6646","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6646","url":null,"abstract":"\u0000 As a kind of sensor for real-time feedback and dynamic monitoring of angular velocity and angular displacement of the system, the common photoelectric encoder is widely used in many fields such as new energy electric vehicles, servo closed-loop control systems, industrial control, security monitoring. In order to improve the resolution and accuracy, a kind of optical and magnetic combined encoder which combines photoelectricity and multi-pole magnetoelectricity is designed in this paper, where the light-blocking disk of photoelectric sensor is designed according to the pseudo-random sequence, and the photoelectric coding is used to determine the magnetic interval of multi-pole. The absolute angle is calculated according to the number of multiple circles plus the angle of single circle. The experimental results at different temperatures (−40 C~100 C) show that the accuracy of the proposed combined encoder can reach ±0.08°, which is improved by 0.37° compared with that of the single-pole encoder. Finally, the combined encoder was applied to the pan-tilt-zoom (PTZ) camera of a video surveillance enterprise, and the experiment showed that its repeated positioning accuracy reached ±0.02°, which is greatly improved compared with single-pole encoder.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"15 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141814781","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 : 2024-07-22DOI: 10.1088/1402-4896/ad6640
Dan Ling, Hao Su, Ce Sun, Junwei Sun, Yanfeng Wang
In recent years, DNA strand displacement (DSD) circuits have been developed in leaps and bounds. The high storage and parallelism of DNA give it an inherent advantage in the field of DNA computations. DSD is widely used in analog computations and neural network computations. However, there are few studies on solving state transfer matrix using DSD circuits. Aiming at the above problems, a scheme for solution of state transfer matrix based on DSD circuits is proposed. In this paper, the summation, subtraction, multiplication, division and exponential reaction modules are built by the DSD reactions. Based on the reaction modules, DNA chemical reaction networks of state transfer matrix are constructed. DSD circuits are built by cascading the DNA chemical reaction networks. The solution of the state transfer matrix is implemented through the DSD circuits. The Visual DSD is used to verify the practicality of DSD circuits. This scheme may provide a reference to analog computations based on DSD circuits.
近年来，DNA 链置换（DSD）电路的发展突飞猛进。DNA 的高存储性和并行性使其在 DNA 计算领域具有先天优势。DSD 广泛应用于模拟计算和神经网络计算。然而，利用 DSD 电路求解状态转移矩阵的研究却很少。针对上述问题，本文提出了一种基于 DSD 电路的状态转移矩阵求解方案。本文利用 DSD 反应建立了求和、减法、乘法、除法和指数反应模块。在反应模块的基础上，构建了状态转移矩阵的 DNA 化学反应网络。通过级联 DNA 化学反应网络构建 DSD 电路。通过 DSD 电路实现状态转移矩阵的求解。Visual DSD 用于验证 DSD 电路的实用性。该方案可为基于 DSD 电路的模拟计算提供参考。
{"title":"Solution of state transfer matrix based on DNA strand displacement circuits","authors":"Dan Ling, Hao Su, Ce Sun, Junwei Sun, Yanfeng Wang","doi":"10.1088/1402-4896/ad6640","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6640","url":null,"abstract":"\u0000 In recent years, DNA strand displacement (DSD) circuits have been developed in leaps and bounds. The high storage and parallelism of DNA give it an inherent advantage in the field of DNA computations. DSD is widely used in analog computations and neural network computations. However, there are few studies on solving state transfer matrix using DSD circuits. Aiming at the above problems, a scheme for solution of state transfer matrix based on DSD circuits is proposed. In this paper, the summation, subtraction, multiplication, division and exponential reaction modules are built by the DSD reactions. Based on the reaction modules, DNA chemical reaction networks of state transfer matrix are constructed. DSD circuits are built by cascading the DNA chemical reaction networks. The solution of the state transfer matrix is implemented through the DSD circuits. The Visual DSD is used to verify the practicality of DSD circuits. This scheme may provide a reference to analog computations based on DSD circuits.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"5 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141817049","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 : 2024-07-19DOI: 10.1088/1402-4896/ad65c4
A. Philip, A. Ruban Kumar
A facile chemical reduction method is employed for the synthesis of α-MnO2 followed by ultrasonication with synthetic graphite and poly (vinylidene pyrrolidone) PVDF for the development of α-MnO2-expanded graphite-PVDF (MGP) composite. Known masses of MGP composite are drop-casted on a fluorine-doped tin oxide (FTO) conducting glass substrate for the fabrication of composite electrodes to use as the cathode. The compositional effects of various weight percentages of graphite on the electrochemical performance of the MGP composite are studied. The increase in graphite’s weight percentage is always accompanied by an equal reduction in the weight of MnO2 by maintaining a constant amount of PVDF. We demonstrate a maximum electrochemical performance for the composite containing 80% MnO2, 10% expanded graphite, and 10% PVDF, further increases in graphite concentration (reduction in that of MnO2) have detrimental effects on the performance. The basis characterisation of the composite is carried out using XRD, FTIR, UV-VIS, AFM, and SEM and the electrochemical studies are done using CV, GCD and EIS. We observe both faradaic and non-faradaic charge storage mechanisms in the composite samples with a 35% capacitive contribution and a 65% diffusive contribution to the total capacitance. Moreover, the composite electrode demonstrates a maximum specific capacitance of 358 F/g at 10 mV/s with an outstanding power density of 2.8 KW/Kg.
{"title":"Effect of graphite concentration on the electrochemical performance of a novel α-MnO2-expanded graphite-PVDF composite cathode material based on FTO substrate","authors":"A. Philip, A. Ruban Kumar","doi":"10.1088/1402-4896/ad65c4","DOIUrl":"https://doi.org/10.1088/1402-4896/ad65c4","url":null,"abstract":"\u0000 A facile chemical reduction method is employed for the synthesis of α-MnO2 followed by ultrasonication with synthetic graphite and poly (vinylidene pyrrolidone) PVDF for the development of α-MnO2-expanded graphite-PVDF (MGP) composite. Known masses of MGP composite are drop-casted on a fluorine-doped tin oxide (FTO) conducting glass substrate for the fabrication of composite electrodes to use as the cathode. The compositional effects of various weight percentages of graphite on the electrochemical performance of the MGP composite are studied. The increase in graphite’s weight percentage is always accompanied by an equal reduction in the weight of MnO2 by maintaining a constant amount of PVDF. We demonstrate a maximum electrochemical performance for the composite containing 80% MnO2, 10% expanded graphite, and 10% PVDF, further increases in graphite concentration (reduction in that of MnO2) have detrimental effects on the performance. The basis characterisation of the composite is carried out using XRD, FTIR, UV-VIS, AFM, and SEM and the electrochemical studies are done using CV, GCD and EIS. We observe both faradaic and non-faradaic charge storage mechanisms in the composite samples with a 35% capacitive contribution and a 65% diffusive contribution to the total capacitance. Moreover, the composite electrode demonstrates a maximum specific capacitance of 358 F/g at 10 mV/s with an outstanding power density of 2.8 KW/Kg.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"122 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141822158","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 : 2024-07-19DOI: 10.1088/1402-4896/ad65c2
A. Metatla, W. Nicolazzi, H. Latelli, A. Bousseksou
An exact examination of a one-dimensional (1D) anharmonic elastic model describing the thermodynamic properties of spin-crossover (SCO) solids is presented. This elastic model incorporates both intra-chain and mean field inter-chain interactions, providing a more understanding of 1D SCO materials. Numerical findings for a linear chain of spins unveil intriguing features, such as a two-step-like transition. Extending the model to interacting chains leads to an additional term in the effective ligand field of the system's Hamiltonian, thereby enhancing its predictive power by accounting for more elastic constants of interactions. This augmentation reinforces the model's validity in capturing the spin-crossover phenomenon. Numerical simulations in this extended framework elucidate clearer two-step-like spin crossover transitions, with the HS_LS fraction of spins approaching maximum values at equilibrium temperature.
{"title":"Transition metal centers with anharmonic elastic interactions in one-dimensional spin-crossover solids","authors":"A. Metatla, W. Nicolazzi, H. Latelli, A. Bousseksou","doi":"10.1088/1402-4896/ad65c2","DOIUrl":"https://doi.org/10.1088/1402-4896/ad65c2","url":null,"abstract":"\u0000 An exact examination of a one-dimensional (1D) anharmonic elastic model describing the thermodynamic properties of spin-crossover (SCO) solids is presented. This elastic model incorporates both intra-chain and mean field inter-chain interactions, providing a more understanding of 1D SCO materials. Numerical findings for a linear chain of spins unveil intriguing features, such as a two-step-like transition. Extending the model to interacting chains leads to an additional term in the effective ligand field of the system's Hamiltonian, thereby enhancing its predictive power by accounting for more elastic constants of interactions. This augmentation reinforces the model's validity in capturing the spin-crossover phenomenon. Numerical simulations in this extended framework elucidate clearer two-step-like spin crossover transitions, with the HS_LS fraction of spins approaching maximum values at equilibrium temperature.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"121 51","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141821011","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}
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