Article
Polymer Science
Elodie Strupiechonski, Marisa Moreno-Rios, Erika O. Avila-Davila, Ramon Roman-Doval, Evgeny Prokhorov, Yuriy Kovalenko, Diana G. Zarate-Trivino, Dora Medina, Gabriel Luna-Barcenas
Summary: Chitosan-gold nanoparticle thin films were synthesized through chemical reduction of HAuCl4. The behavior of these films was investigated in relation to moisture and HAuCl4 content, revealing two relaxation processes related to glass transition and local diffusion of ions. The HAuCl4 content affected the conductivity of the films, demonstrating a percolation effect.
Article
Materials Science, Ceramics
J. Pundareekam Goud, Ajeet Kumar, Mahmoud S. Alkathy, Kongbrailatpam Sandeep, Akhil T. S. Raman, Bibhudatta Sahoo, Jungho Ryu, K. C. James Raju
Summary: Ba0.5Sr0.5TiO3 (BST) thin films with different thicknesses were fabricated on fused silica quartz substrate using pulsed laser deposition (PLD) technique. The thickness of thin films was changed by varying the number of pulses from 2500 to 20,000. X-ray diffraction (XRD) and Raman spectrum were used for phase confirmation, and field emission scanning electron microscopy (FESEM) was used to observe microstructure of BST thin films. The highest microwave tunability of 55.5% was achieved for the BST thin film with a thickness of 300 nm. It was found that too small film thicknesses and too thick films were not suitable for high dielectric tunability due to constraints by the amorphous substrate and approaching bulk grain size, respectively.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Clemens Mart, Thomas Kaempfe, Kati Kuehnel, Malte Czernohorsky, Sabine Kolodinski, Maciej Wiatr, Wenke Weinreich, Lukas M. Eng
Summary: The hafnium oxide material class is characterized by the coexistence of multiple polymorphs, with phase transitions induced by composition and external electric fields. This material system is of particular interest for pyroelectric applications due to its ability for scalable and semiconductor-compatible fabrication, as well as the large pyroelectric coefficients observed at morphotropic transitions.
Article
Metallurgy & Metallurgical Engineering
Ming Jiang, Zhan Cheng, Dan Zhao, Lei Zhang, Dong Xu
Summary: In this study, Mg-doped CCTO thin films were prepared by a modified sol-gel method, and a comparative study on their microstructure and electrical properties was carried out. The results showed that Mg doping could reduce the grain size of CCTO films and improve the dielectric constant and frequency stability.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Chemistry, Physical
Bin Quan, Yu Chen, Yu Wang, Xiaochi Lu, Tengchao Guo, Mingji Zhang, Xiaogu Huang
Summary: In this study, an optimized thermally assisted homogeneous separation technology was proposed to fabricate thermoplastic elastomer-based magnetic/dielectric two-phase mixed EM wave absorption films, which exhibit good flexibility, machinability, mechanical strength, and excellent EM wave absorption performances. The films prepared by this technology show good flexibility and fine mechanical properties, as well as broad effective bandwidth and tunable frequency response.
Article
Engineering, Electrical & Electronic
Ye Wang, Xiaofang Liu, Huajun Sun, Huiting Sui, Chao Yan
Summary: The compositionally graded structure thin films can achieve high energy storage performance, with key factors including dielectric constant and Ba/Sr ratio. The introduction of interface at high applied electric field effectively improves the penetration resistance of the films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Qingqing Chen, Daxin Li, Xingqi Liao, Zhihua Yang, Dechang Jia, Yu Zhou, Ralf Riedel
Summary: Lightweight SiBCN ceramic nanofibers with tunable electromagnetic wave absorption were prepared by electrostatic spinning and high-temperature annealing techniques. The defect-free nanofibers, composed of an amorphous matrix, beta-SiC, and free carbon nanocrystals, exhibited good microwave absorption properties after annealing at 1600 degrees C. The optimized microstructure endowed the SiBCN ceramic nanofibers with potential applications as lightweight and ultrastrong radar wave absorbers in military and commercial markets.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
M. Waqas, Saba Niaz, Khalid M. Batoo, Sidra Khalid, Shahid Atiq, Y. B. Xu, Shahzad Naseem, Saira Riaz
Summary: Research on thin films of iron oxide has gained interest due to its application in advanced spintronic and electronic devices. In this work, a cost-effective microwave assisted sol-gel approach is used to prepare iron oxide thin films. The effects of different dopant concentrations on the properties of the thin films are investigated, and the results show that co-doping with (Al, Cr) can tune the magnetic response. This material has potential applications in advanced spintronic and energy storage devices.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Electrical & Electronic
Srinivas Pattipaka, Pamu Dobbidi, J. Pundareekam Goud, K. C. James Raju, Gobinda Pradhan, V. Sridhar
Summary: The study investigates the optical and microwave dielectric properties of Bi0.5Na0.5TiO3 (BNT) thin films grown under different oxygen pressures using pulsed laser deposition. It reveals a close relationship between crystal structure, oxygen content, and film crystallinity, as well as the impact of oxygen pressure on the interface properties. The optimized films show higher refractive index, lower optical bandgap, and potential applications in high-frequency devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
M. A. Benali, M. Z. Belmehdi, I. E. Yahiaoui, M. Z. Chekroun, A. Neffah, K. M. E. Boureguig, M. Debab, H. Tabet-Derraz
Summary: The study investigates the impact of Na-doped ZnO films on structural and optical properties through experiments and theoretical calculations. The results demonstrate the potential of using mixture models for oxide doping to predict optical properties accurately.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Fan Yang, Jun Li, Yin Long, Ziyi Zhang, Linfeng Wang, Jiajie Sui, Yutao Dong, Yizhan Wang, Rachel Taylor, Dalong Ni, Weibo Cai, Ping Wang, Timothy Hacker, Xudong Wang
Summary: The research introduces a novel approach for the large-scale fabrication of piezoelectric biomaterial thin films with excellent piezoelectric properties and mechanical flexibility. The glycine-PVA films, with their natural compatibility and degradability in physiological environments, have the potential to advance the development of transient implantable electromechanical devices.
Article
Chemistry, Physical
Jing-Yu Deng, Wang-Suo Xia, Wen-Hu Zhang, Tian-Liang Tang, Ying Wang, Jia-Lun Du
Summary: LaNbO4 ceramics with NiO/CoO addition were prepared through a solid-state reaction, resulting in lower sintering temperatures and improved microwave dielectric properties. The addition of NiO and CoO optimized the quality factor values, with grain size being identified as the dominant factor affecting the quality factor optimization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
D. M. Habashy, H. E. Atyia, H. I. Lebda
Summary: The article is divided into two main sections. The first section explores the AC conduction of Se83Bi17, Se83Bi17Ge5, and Se83Bi17Te5 in thin film forms through experimental study, revealing that the conduction process is governed by the hopping mechanism. The second section focuses on the estimation and prediction of AC conduction using Artificial Neural Networks and Genetic Programming, concluding that ANN approach is more suitable for simulating and forecasting AC conductivity.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Engineering, Environmental
Han Yan, Zhichao Lou, Lei Xu, Hualiang Lv
Summary: The use of agroforestry waste to create carbon-based flakes has attracted attention due to their low density and stable properties, making them an ideal electromagnetic wave absorber.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Weihuan Tang, Yuanxun Li, Sheng Li, Tingting Tang, Mingshan Qu, Jie Li, Fuyu Li
Summary: To improve the performance of polarization converters, microwave dielectric properties of Ca5Mn4(VO4)(6) ceramics are improved by substituting Cu2+ for Mn2+. The substituted ceramics exhibit excellent microwave dielectric properties with ε(r) = 11.4, Q x f = 42709 GHz, and τ(f) = -65 ppm/°C. This ceramic substrate is used to design a new 5G polarization converter, which demonstrates good performance in converting between linear polarization and left-handed circularly polarized waves.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Computer Science, Interdisciplinary Applications
Vitaly Chernik, Pavel Buklemishev
Summary: The paper introduces a simple 2D model for describing the cell motility on a homogeneous isotropic surface. The model incorporates the dynamics of complex actomyosin liquid, which affects the boundary dynamics and cell motility. It consists of a system of equations with a free boundary domain and includes a non-local term. The numerical solution of this model is presented in this work.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Hasan Karjoun, Abdelaziz Beljadid
Summary: In this study, we developed a numerical model based on the depth-averaged shallow water equations to simulate flows through vegetation field. The model takes into account the drag and inertia forces induced by vegetation, using different formulations for the stem drag coefficient. Turbulence induced by vegetation is also considered through the addition of diffusion terms in the momentum equations. The proposed numerical model is validated through numerical simulations and shows good accuracy in simulating overland flows under vegetation effects.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Bechir Naffeti, Hamadi Ammar, Walid Ben Aribi
Summary: This paper proposes a branch and bound multidimensional Holder optimization method, which converts a multivariate objective function into a single variable function and minimizes it using an iterative optimization method. The method is applied to solve a parameters identification problem resulting from the increase in infections, providing information about the prevalence and infection force.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Heba F. Eid, Erik Cuevas, Romany F. Mansour
Summary: The proposed modified Bonobo optimizer algorithm dynamically adjusts the trajectory of each search agent to overcome the flaw of the original algorithm and improve the performance and solution quality by exploring and exploiting different regions of the solution space.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Farshid Mehrdoust, Idin Noorani, Juho Kanniainen
Summary: This paper proposes a Markov-switching model to evaluate the dynamics of commodity futures and spot prices, and introduces a hidden Markov chain to model the sudden jumps in commodity prices. The model is calibrated using the crude oil spot price and estimation-maximization algorithm. The study also evaluates European call options written on crude oil futures under the regime-switching model and derives Greek formulas for risk assessment. The importance of this paper is rated at 8 out of 10.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Rupa Mishra, Tapas Kumar Saha
Summary: This paper presents a control scheme for distributed generation units to operate in stand-alone and grid-connected modes, with a smooth transition between the two. The control strategy includes predictive control for voltage and frequency regulation in stand-alone mode, and power control for symmetrical and unbalanced grid voltage conditions in grid-connected mode. The proposed control method improves power factor, reduces grid current harmonics, and eliminates grid frequency ripple.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Yu Wang, Yang Tian, Yida Guo, Haoping Wang
Summary: This paper proposes a multi-level control strategy for lower limb patient-exoskeleton coupling system (LLPECS) in rehabilitation training based on active torque. The controller consists of three sub-controllers: gait adjustment layer, interaction torque design layer, and trajectory tracking layer. The effectiveness of the proposed control strategy is demonstrated through co-simulations in the SimMechanics environment using an exoskeleton virtual prototype developed in SolidWorks.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Takuji Arai, Yuto Imai
Summary: The Barndorff-Nielsen and Shephard model is a jump-type stochastic volatility model, and this paper proposes two simulation methods for computing option prices under a representative martingale measure. The performance of these methods is evaluated through numerical experiments.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Wanai Li
Summary: This paper proposes a new framework that combines quadrature-based and quadrature-free discontinuous Galerkin methods and applies them to triangular and tetrahedral grids. Four different DG schemes are derived by choosing specific test functions and collocation points, improving computational efficiency and ease of code implementation.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Xiyuan Chen, Qiubao Wang
Summary: This paper introduces a technique that combines dynamical mechanisms and machine learning to reduce dimensionality in high-dimensional complex systems. The method utilizes Hopf bifurcation theory to establish a model paradigm and utilizes machine learning to train location parameters. The effectiveness and robustness of the proposed method are tested and validated through experiments and simulations.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Muhammad Farman, Aqeel Ahmad, Anum Zehra, Kottakkaran Sooppy Nisar, Evren Hincal, Ali Akgul
Summary: Diabetes is a significant public health issue that affects millions of people worldwide. This study proposes a mathematical model to understand the mechanisms of glucose homeostasis, providing valuable insights for diabetes management. The model incorporates fractional operators and analyzes the impact of a new wave of dynamical transmission on equilibrium points, offering a comprehensive understanding of glucose homeostasis.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Gholamreza Shobeyri
Summary: This study introduces two improved Laplacian models for more accurate simulation of free surface flows in the context of the MPS method. The higher accuracy of these models compared to the traditional methods is verified through solving 2D Poisson equations and solving three benchmark free surface flow problems. These models can also resolve the issue of wave damping in the original MPS computations.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Qiang Li, Jinling Liang, Weiqiang Gong, Kai Wang, Jinling Wang
Summary: This paper addresses the problem of nonfragile state estimation for semi-Markovian switching complex-valued networks with time-varying delay. By constructing an event-triggered generator and solving matrix inequalities, less conservative criteria are obtained, and the gains of the nonfragile estimator are explicitly designed. A numerical example is provided to demonstrate the effectiveness of the proposed estimation scheme.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
Gengen Zhang, Jingyu Li, Qiong-Ao Huang
Summary: In this paper, a novel class of unconditionally energy stable schemes are constructed for solving gradient flow models by combining the relaxed scalar auxiliary variable (SAV) approach with the linear multistep technique. The proposed schemes achieve second-order temporal accuracy and strictly unconditional energy stability.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)
Article
Computer Science, Interdisciplinary Applications
S. Clain, J. Figueiredo
Summary: This study proposes a detailed construction of a very high-order polynomial representation and introduces a functional to assess the quality of the reconstruction. Several optimization techniques are implemented and their advantages in terms of accuracy and stability are demonstrated.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2024)