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Donor-induced electrically charged defect levels: examining the role of indium and n-type defect-complexes in germanium 供体诱导的带电缺陷水平:研究锗中铟和 n 型缺陷复合物的作用
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-18 DOI: 10.1007/s10825-024-02179-0
Emmanuel Igumbor

Defect levels induced by defect-complexes in Ge play important roles in device fabrication, characterization, and processing. However, only a few defect levels induced by defect-complexes have been studied, hence limiting the knowledge of how to control the activities of numerous unknown defect-complexes in Ge. In this study, hybrid density functional theory calculations of defect-complexes involving oversize atom (indium) and n-type impurity atoms in Ge were performed. The formation energies, defect-complex stability, and electrical characteristics of induced defect levels in Ge were predicted. Under equilibrium conditions, the formation energy of the defect-complexes was predicted to be within the range of 5.90–11.38 eV. The defect-complexes formed by P and In atoms are the most stable defects with binding energy in the range of 3.31-3.33 eV. Defect levels acting as donors were induced in the band gap of the host Ge. Additionally, while shallow defect levels close to the conduction band were strongly induced by the interactions of Sb, P, and As interstitials with dopant (In), the double donors resulting from the interactions between P, As, N, and the host atoms including In atom are deep, leading to recombination centers. The results of this study could be applicable in device characterization, where the interaction of In atom and n-type impurities in Ge is essential. This report is important as it provides a theoretical understanding of the formation and control of donor-related defect-complexes in Ge.

缺陷复合体在 Ge 中诱导的缺陷水平在器件制造、表征和加工中发挥着重要作用。然而,只有少数由缺陷复合物诱导的缺陷水平得到了研究,因此限制了人们对如何控制 Ge 中众多未知缺陷复合物活动的了解。本研究对 Ge 中涉及超大原子(铟)和 n 型杂质原子的缺陷复合物进行了混合密度泛函理论计算。预测了 Ge 中诱导缺陷水平的形成能量、缺陷复合物稳定性和电学特性。在平衡条件下,缺陷复合物的形成能量预计在 5.90-11.38 eV 范围内。由 P 原子和 In 原子形成的缺陷复合物是最稳定的缺陷,其结合能在 3.31-3.33 eV 之间。在宿主 Ge 的带隙中诱发了作为供体的缺陷水平。此外,Sb、P 和 As 间隙与掺杂剂(In)的相互作用强烈地诱发了接近导带的浅缺陷水平,而 P、As、N 和宿主原子(包括 In 原子)之间的相互作用产生的双供体则很深,从而导致了重组中心。这项研究的结果可应用于设备表征,其中 In 原子与 Ge 中 n 型杂质的相互作用至关重要。本报告提供了对 Ge 中供体相关缺陷复合物的形成和控制的理论理解,因而具有重要意义。
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引用次数: 0
Tuning sensitivity of bimetallic, MXene and graphene-based SPR biosensors for rapid malaria detection: a numerical approach 调谐双金属、MXene 和石墨烯基 SPR 生物传感器的灵敏度以快速检测疟疾:一种数值方法
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-17 DOI: 10.1007/s10825-024-02191-4
Bhishma Karki, Arun Uniyal, Manoj Sharma, Ram Bharos Yadav, Parusharamulu Buduma

The potential of surface plasmon resonance (SPR) biosensors to detect different biomolecules quickly and sensitively has attracted much attention. In this work, we use a numerical method to identify malaria phases by exploring the sensitivity adjustment of SPR sensors based on bimetallic, MXene and graphene layers. Effective treatment for malaria, a potentially fatal disease brought on by plasmodium parasites, depends on early identification. Innovative biosensing technologies are necessary since traditional diagnostic procedures frequently lack sensitivity and speed. The transfer matrix method is employed here in this study for reflectance calculation. The COMSOL software finds the electric field distribution across the various layers interfaces. The maximum sensitivity of 301.1667°/RIU has been attained for the proposed work.

表面等离子体共振(SPR)生物传感器在快速灵敏地检测不同生物分子方面的潜力备受关注。在这项工作中,我们采用数值方法,通过探索基于双金属层、MXene 层和石墨烯层的 SPR 传感器的灵敏度调整来识别疟疾阶段。疟疾是一种由疟原虫引起的潜在致命疾病,其有效治疗取决于早期识别。由于传统诊断程序往往缺乏灵敏度和速度,因此有必要采用创新的生物传感技术。本研究采用传递矩阵法进行反射率计算。COMSOL 软件可以计算出各层界面上的电场分布。拟议工作的最大灵敏度为 301.1667°/RIU。
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引用次数: 0
Addressing multi-molecule field-coupled nanocomputing for neural networks with SCERPA 利用 SCERPA 解决神经网络的多分子场耦合纳米计算问题
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-12 DOI: 10.1007/s10825-024-02189-y
Federico Ravera, Giuliana Beretta, Yuri Ardesi, Mariagrazia Graziano, Gianluca Piccinini

The molecular field-coupled nanocompunting (molFCN) technology encodes the information in the charge distribution of electrostatically coupled molecules, making it an exciting solution for future beyond-CMOS low-power electronics. Recent literature has shown that multi-molecule molFCN enables the design of devices with tailored unconventional characteristics, such as majority voters working as artificial neurons. This work presents a multi-molecule molFCN neuron model based on the weighted-inputs formulation to estimate molFCN neurons behavior. Then, the introduced model is used to design each neuron of molFCN circuits working as neural networks. In particular, we propose a molFCN neural network operating as an input pattern classifier. The results show the model aptitude in predicting the logic output values for individual neurons and, consequently, entire networks. The model accuracy has been evaluated by comparing the results from the neuron mathematical model with those obtained from the circuit-level simulations conducted with the SCERPA tool. Overall, this study highlights the strategic use of diverse molecules in molFCN layouts, customizing circuit operations, and expanding design possibilities for specific molFCN device functioning.

分子场耦合纳米共振(molFCN)技术将信息编码在静电耦合分子的电荷分布中,使其成为未来超越CMOS低功耗电子技术的令人兴奋的解决方案。最近的文献表明,多分子 molFCN 能够设计出具有量身定制的非常规特性的器件,如作为人工神经元工作的多数表决器。本研究提出了一种基于加权输入公式的多分子 molFCN 神经元模型,用于估计 molFCN 神经元的行为。然后,利用引入的模型来设计作为神经网络工作的 molFCN 电路的每个神经元。特别是,我们提出了一种作为输入模式分类器运行的 molFCN 神经网络。结果表明,该模型能够预测单个神经元的逻辑输出值,进而预测整个网络的逻辑输出值。通过比较神经元数学模型与 SCERPA 工具进行的电路级仿真结果,对模型的准确性进行了评估。总之,这项研究强调了在 molFCN 布局中战略性地使用不同分子、定制电路操作以及为特定 molFCN 器件功能拓展设计可能性的重要性。
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引用次数: 0
Mathematical modeling of solar cells: novel approaches based on Special Trans Function Theory 太阳能电池数学建模:基于特殊反函数理论的新方法
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-12 DOI: 10.1007/s10825-024-02190-5
Martin Ćalasan

In a mathematical sense, regardless of the equivalent circuit, solar cells are represented by nonlinear dependencies of current and voltage. First, this paper discusses novel mathematical formulations of the current–voltage dependencies of solar cells for single-diode, double-diode, and triple-diode models (SDM, DDM, and TDM, respectively). Second, for SDM, although the analytical solution expressed through Special Trans Function Theory (STFT) was known in the literature, in this paper, its applicability was checked for the first time, and a comparison was made with a literature approach. Third, for both DDM and TDM, novel original iterative procedures for current–voltage dependencies based on the application of the STFT have been proposed. Fourth, the accuracy and efficiency of all the proposed solutions were confirmed by observing two different, well-known solar cells. Furthermore, the applicability of the proposed solutions was confirmed by experimentally measuring the current‒voltage characteristics of solar cells under different climatic conditions. The proposed modeling approaches undoubtedly represent a new field for the application of STFTs.

从数学意义上讲,无论等效电路如何,太阳能电池都是通过电流和电压的非线性依赖关系来表示的。首先,本文讨论了单二极管、双二极管和三二极管模型(分别为 SDM、DDM 和 TDM)太阳能电池电流-电压相关性的新数学公式。其次,对于 SDM,虽然文献中已有通过特殊跨函数理论(STFT)表达的分析解,但本文首次检验了其适用性,并与文献方法进行了比较。第三,针对 DDM 和 TDM,提出了基于 STFT 应用的新颖的电流-电压相关性迭代程序。第四,通过观察两个不同的知名太阳能电池,证实了所有建议解决方案的准确性和效率。此外,通过实验测量不同气候条件下太阳能电池的电流-电压特性,证实了所提方案的适用性。所提出的建模方法无疑代表了 STFT 应用的一个新领域。
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引用次数: 0
A feasibility study of microwave UAV imaging based on multi-station polarimetric radars 基于多站偏振雷达的无人飞行器微波成像可行性研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-12 DOI: 10.1007/s10825-024-02185-2
Haolin Zhang, Jiaxin Xie, Yabo Liu, Xin Zhao, Zhongjun Yu, Zicheng Wang, Shichao Chen

Effective regulation of unmanned aerial vehicles (UAVs) is crucial to social and public safety. In this paper, a microwave UAV imaging method is proposed for multi-station polarimetric radars. A polarimetric far-field scattering model is built to formulate the inverse scattering problem for various multi-station radar configurations. (mathscr {L}_1)-norm regularization is incorporated in the inversion to realize a high spatial resolution. Numerical experiments are carried out with FEKO taking a typical quadcopter UAV as the target. Reconstruction results with polarization dependence of bistatic and multi-station radar configurations and multiple observation ranges are given. A spatial resolution study reveals the resolution of the proposed algorithm and analyzes the relationship between resolution and multiple factors. The results validate the feasibility of microwave UAV imaging with multi-station polarimetric radars.

有效监管无人驾驶飞行器(UAV)对社会和公共安全至关重要。本文提出了一种针对多站偏振雷达的微波无人机成像方法。本文建立了一个偏振远场散射模型,以提出各种多站雷达配置的反散射问题。在反演中加入了(mathscr {L}_1)正则化,以实现高空间分辨率。以典型的四旋翼无人机为目标,利用 FEKO 进行了数值实验。给出了双偏振和多站雷达配置以及多种观测范围的极化依赖性重建结果。空间分辨率研究揭示了所提算法的分辨率,并分析了分辨率与多种因素之间的关系。结果验证了利用多站偏振雷达进行微波无人机成像的可行性。
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引用次数: 0
Unveiling the diverse applications and problem-solving capabilities of the MOM-GEC hybrid approach: a comprehensive systematic review 揭示 MOM-GEC 混合方法的各种应用和解决问题的能力:全面系统审查
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-12 DOI: 10.1007/s10825-024-02169-2
Mariem Abdi, Taoufik Aguili

Hybrid numerical methods show great potential in enhancing conventional approaches, particularly when dealing with complex structures beyond the capabilities of individual methods or standard software. This paper provides a comprehensive overview of the Method of Moments combined with the Generalized Equivalent Circuit (MOM-GEC) in electromagnetic modeling. Through comparative analysis with traditional numerical methods such as the Method of Moments, Finite Difference Time Domain (FDTD), and Finite Element Method (FEM), MOM-GEC’s unique advantages in adaptability, accuracy, and computational efficiency are highlighted. Mathematical formulations based on equations are integrated to clarify the method’s concepts and integration processes. The study showcases MOM-GEC’s successful deployment in various applications, demonstrating its versatility and efficacy in intricate scenarios such as antenna arrays, graphene-based metamaterial devices, and dosimetry in partially enclosed environments. Each case study undergoes re-evaluation by incorporating the generalized equivalent circuit approach, emphasizing MOM-GEC’s effectiveness in addressing diverse challenges. This underscores MOM-GEC’s versatility and efficacy across complex scenarios, reaffirming its value in electromagnetic modeling.

混合数值方法在增强传统方法方面显示出巨大潜力,尤其是在处理超出单个方法或标准软件能力的复杂结构时。本文全面概述了矩量法与广义等效电路(MOM-GEC)在电磁建模中的结合。通过与矩量法、有限差分时域法(FDTD)和有限元法(FEM)等传统数值方法的对比分析,MOM-GEC 在适应性、准确性和计算效率方面的独特优势得到了凸显。研究还整合了基于方程的数学公式,以阐明该方法的概念和整合过程。研究展示了 MOM-GEC 在各种应用中的成功部署,证明了其在天线阵列、基于石墨烯的超材料设备以及部分封闭环境中的剂量测定等复杂场景中的多功能性和有效性。通过采用广义等效电路方法,对每个案例研究进行了重新评估,强调了 MOM-GEC 在应对各种挑战方面的有效性。这强调了 MOM-GEC 在复杂情况下的多功能性和有效性,再次肯定了其在电磁建模中的价值。
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引用次数: 0
Potential of TiO2 as a capping layer for industrial c-Si PERC solar cells 二氧化钛作为工业化晶体硅 PERC 太阳能电池封盖层的潜力
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-12 DOI: 10.1007/s10825-024-02187-0
Aamenah Siddiqui, Muhammad Usman, Anders Hallén

Titanium dioxide (TiO2) has gained popularity especially in photovoltaic applications, owing to its transparency in the visible region, and scratch resistance. In this work, the potential of TiO2 as a capping layer for c-Si p-type SiNx passivated emitter and rear contact (PERC) solar cells is studied through extensive optical and device simulations. The bifacial PERC solar cell model used in this study is calibrated with an experimental device having an efficiency of 22.19%. Device simulation results show that TiO2 deposited by the mesoporous technique outperforms atmospheric pressure chemical vapor deposition (APCVD) and atomic layer deposition (ALD)-based TiO2 layers when capped over SiNx (n = 2.1) passivated solar cells. Furthermore, it is shown that the efficiency of SiNx (n = 2.1)/TiO2 based solar cells is maintained, even when the TiO2 layer thickness varies from 75 to 95 nm. To enhance the efficiency further, the type of SiNx layer (characterized by the n value), and the thicknesses of SiNx and TiO2 layers are optimized simultaneously to find the best combination of these parameters. The best front side solar cell efficiency of 22.43%, is obtained when a stack of SiNx(n = 1.99)/TiO2 (t = 58/76 nm) is used. Similarly, a rear side efficiency of 16.59% is achieved when the rear side Al2O3/SiNx stack is capped with mesoporous TiO2. These efficiencies are 0.24 and 1.25% higher, respectively, when compared to the original SiNx passivated PERC solar cell, demonstrating the prospective of using TiO2 in encapsulant-free commercial photovoltaic applications.

二氧化钛(TiO2)因其在可见光区域的透明度和抗划伤性,在光伏应用中尤其受到青睐。在这项研究中,通过大量的光学和器件模拟,研究了二氧化钛作为晶体硅 p 型氮化硅钝化发射极和后触点(PERC)太阳能电池的封盖层的潜力。本研究中使用的双面 PERC 太阳能电池模型通过效率为 22.19% 的实验装置进行了校准。器件模拟结果表明,当在钝化的 SiNx(n = 2.1)太阳能电池上盖上基于介孔技术沉积的 TiO2 层时,其性能优于基于大气压化学气相沉积(APCVD)和原子层沉积(ALD)的 TiO2 层。此外,研究还表明,即使 TiO2 层的厚度在 75 至 95 nm 之间变化,基于 SiNx(n = 2.1)/TiO2 的太阳能电池的效率也能保持不变。为了进一步提高效率,我们同时对氮化硅层的类型(以 n 值为特征)、氮化硅层和二氧化钛层的厚度进行了优化,以找到这些参数的最佳组合。当使用 SiNx(n = 1.99)/TiO2(t = 58/76 nm)叠层时,太阳能电池的正面效率达到 22.43%。同样,当背面 Al2O3/SiNx 叠层被介孔 TiO2 封盖时,背面效率为 16.59%。与原始的 SiNx 钝化 PERC 太阳能电池相比,这些效率分别提高了 0.24% 和 1.25%,这表明 TiO2 在无封装商用光伏应用中的前景广阔。
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引用次数: 0
A review of structural and electronic properties of graphyne-based nanotubes 石墨基纳米管的结构和电子特性综述
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-11 DOI: 10.1007/s10825-024-02181-6
Roya Majidi

Graphyne-based nanotubes are cylindrical structures made up of a single layer of graphyne that has been rolled into a tube. These one-dimensional structures are constructed from carbon atoms with both sp and sp2 hybridization. The common graphene-based carbon nanotubes, and graphyne-based nanotubes including α-, β-, γ-, α2-, 6,6,12-, and δ-graphyne nanotubes are introduced. The atomic structures and electronic characteristics of these tubes are reviewed. The electronic band structures and density of states calculated by density functional theory are presented. The nanotubes with different types and chiralities display either metallic or semiconducting characteristics. The variety of structures and electronic properties of these nanotubes make them extremely hopeful for applications, especially in nanoelectronic devices such as field emission transistors, sensors, nanoelectromechanical systems, super capacitors, energy and data storage devices.

基于石墨烯的纳米管是由单层石墨烯卷成的圆柱形结构。这些一维结构由 sp 和 sp2 杂化的碳原子构成。本文介绍了常见的石墨烯基碳纳米管和石墨基纳米管,包括α-、β-、γ-、α2-、6,6,12-和δ-石墨烯纳米管。回顾了这些管子的原子结构和电子特性。介绍了用密度泛函理论计算的电子带结构和态密度。不同类型和手性的纳米管显示出金属或半导体特性。这些纳米管的各种结构和电子特性使其极具应用前景,尤其是在纳米电子器件方面,如场发射晶体管、传感器、纳米机电系统、超级电容器、能量和数据存储设备等。
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引用次数: 0
Advancing microwave ablation applicators: integrating computational modeling of a graphene-based applicator with machine learning for ablation zone prediction 推进微波消融涂抹器:将基于石墨烯的涂抹器计算建模与机器学习相结合,进行消融区预测
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-06 DOI: 10.1007/s10825-024-02186-1
Suyash Kumar Singh, Amar Nath Yadav

This research focuses on the design and optimization of a graphene-based microwave ablation applicator (MWA) for tumor treatment. The unique properties of graphene, such as high impedance at microwave frequency and tunable Fermi energy, make it an ideal candidate for inducing charge carriers through an electric field or chemical doping. The study further employs machine learning techniques, including support vector regression (SVR) and artificial neural networks (ANN) to predict the ablation zone. The applicator design incorporates a helix antenna element connected to a coaxial cable working at 2.45 GHz with a graphene sheet and T-ring attached to the outer conductor. The challenge of achieving a zero-Fermi energy is addressed by introducing defects to increase surface resistivity, resulting in an impedance close to the required value. The results show that the graphene-based applicator enhances the ablation zone, leading to efficient and controlled tumor treatment. To predict the ablation zone accurately, the study employs machine learning techniques, including SVR and ANN utilizing Taguchi method to reduce computational complexity. Large and round ablation zone is achieved using novel applicator. Further, the performance metrics, including root-mean-squared error and coefficient of determination (R2), are utilized to evaluate the predictive capabilities of the model and found to be optimum. The research demonstrates the potential of graphene in improving MWA treatment and highlights the importance of machine learning in optimizing MWA and predicting treatment outcomes.

Graphical abstract

这项研究的重点是设计和优化用于肿瘤治疗的石墨烯基微波消融涂抹器(MWA)。石墨烯在微波频率下具有高阻抗和可调费米能等独特性能,使其成为通过电场或化学掺杂诱导电荷载流子的理想候选材料。该研究进一步采用了机器学习技术,包括支持向量回归(SVR)和人工神经网络(ANN)来预测烧蚀区域。涂抹器的设计采用了螺旋天线元件,该元件与工作频率为 2.45 GHz 的同轴电缆相连,石墨烯薄片和 T 形环连接到外导体上。通过引入缺陷来增加表面电阻率,使阻抗接近所需数值,从而解决了实现零费米能的难题。研究结果表明,基于石墨烯的涂抹器能增强消融区,从而实现高效、可控的肿瘤治疗。为了准确预测消融区,研究采用了机器学习技术,包括利用田口方法的 SVR 和 ANN,以降低计算复杂性。利用新型涂抹器实现了大而圆的消融区。此外,还利用均方根误差和判定系数 (R2) 等性能指标来评估模型的预测能力,结果发现模型的预测能力是最佳的。该研究证明了石墨烯在改善 MWA 治疗方面的潜力,并强调了机器学习在优化 MWA 和预测治疗结果方面的重要性。
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引用次数: 0
Performance analysis of CsPbI3-based solar cells under light emitting diode illumination as an energy harvester for IoT and indoor photovoltaics 发光二极管照明下的 CsPbI3 太阳能电池作为物联网和室内光伏发电能源收集器的性能分析
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-05 DOI: 10.1007/s10825-024-02180-7
M. Sujith, R. Thandaiah Prabu, ATA. Kishore Kumar, Atul Kumar

Internet of things (IoT) has necessitated the development of indoor photovoltaics to enable a web of self-powered wireless sensors/nodes. We analysed a CsPbI3 wide band gap perovskite for indoor photovoltaic application. An Indoor photovoltaic (IPV) device based on CsPbI3 showed a theoretical efficiency of 51.5% at a band gap of 1.8 eV under indoor light-emitting diode (LED) illumination. This high efficiency is due to better capture of the narrow emission spectrum of LED by a high band gap CsPbI3 absorber. Under low luminance of indoor light sources, there is a low density of photogenerated carriers, which increases the ratio of trapped electrons to photogenerated electrons. The low photogenerated carrier density lowered bulk recombination, and the high trapped electrons to photogenerated electrons ratio increases IPV sensitivity toward interfacial recombination. Finally, the device optimization strategies of the IPV device, distinct from outdoor illumination devices are highlighted.

物联网(IoT)要求开发室内光伏技术,以实现自供电无线传感器/节点网络。我们分析了一种用于室内光伏应用的 CsPbI3 宽带隙过氧化物。基于 CsPbI3 的室内光伏(IPV)设备显示,在室内发光二极管(LED)照明下,带隙为 1.8 eV 时的理论效率为 51.5%。之所以能达到如此高的效率,是因为高带隙 CsPbI3 吸收体能更好地捕捉 LED 的窄发射光谱。在室内光源亮度较低的情况下,光生载流子密度较低,从而增加了捕获电子与光生电子的比例。较低的光生载流子密度降低了体重组,而较高的俘获电子与光生电子比增加了 IPV 对界面重组的敏感性。最后,重点介绍了有别于室外照明设备的 IPV 设备优化策略。
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引用次数: 0
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Journal of Computational Electronics
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