Article
Nanoscience & Nanotechnology
J. Askey, M. Hunt, W. Langbein, S. Ladak
Summary: Cylindrical magnetic nanowires have been extensively studied for their unique topology and dynamic properties. This study numerically investigates the domain wall magnetization textures of nickel nanowires and discovers a new domain wall type that combines aspects of both Bloch point walls and asymmetric transverse walls.
Article
Physics, Mathematical
Marco Bertenghi, Alejandro Rosales-Ortiz
Summary: In this work, the authors investigate a random walk and propose positively and negatively step-reinforced random walk models. They prove functional limit theorems for these three models when the parameter p is less than 1/2 and the steps are centered. The limiting process is Gaussian and can be represented in terms of stochastic integrals.
JOURNAL OF STATISTICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Konstantin Speckner, Matthias Weiss
Summary: Single-particle tracking is a powerful tool for quantifying transport phenomena in complex media, allowing for detailed comparison with theoretical predictions. When applied to biochemically active cell extracts, it reveals key insights into the transport behavior of nano-sized particles.
Article
Chemistry, Multidisciplinary
Gloria Orfila, David Sanchez-Manzano, Ashima Arora, Fabian Cuellar, Sandra Ruiz-Gomez, Sara Rodriguez-Corvillo, Sandra Lopez, Andrea Peralta, Santiago J. Carreira, Fernando Gallego, Javier Tornos, Victor Rouco, Juan J. Riquelme, Carmen Munuera, Federico J. Mompean, Mar Garcia-Hernandez, Zouhair Sefrioui, Javier E. Villegas, Lucas Perez, Alberto Rivera-Calzada, Carlos Leon, Sergio Valencia, Jacobo Santamaria
Summary: Generation, manipulation, and sensing of magnetic domain walls are important for spintronic devices. La1-xSrxMnO3 (LSMO) manganites show promise due to their robust half-metallic ground state. However, the understanding of domain wall magnetoresistance is limited, with conflicting interpretations of experimental data. In this study, domain wall magnetoresistance is measured in LSMO nanowires, showing large values originating from spin accumulation. This non-adiabatic process has implications for future oxide spintronic sensors.
ADVANCED MATERIALS
(2023)
Article
Environmental Sciences
Emanuela Bianchi Janetti, Alberto Guadagnini, Monica Riva
Summary: We propose a reliable and efficient methodological framework for interpreting laboratory-scale partitioning tracer test data under uncertainty. The framework is based on a Time domain random walk (TDRW) particle tracking methodology, which is extended to include transport of partitioning tracers considering retardation and trapping mechanisms. The maximum likelihood (ML) approach is used to estimate model parameters, including residual immobile phase saturation and the partition coefficient. Experimental observations of the partition coefficient are included in the objective function with a regularization term. The results show that the TDRW-based approach effectively captures the observed breakthrough curves of partitioning tracers and provides satisfactory estimates of residual immobile phase saturation.
WATER RESOURCES RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
O. Vahovsky, K. Richter, R. Varga, J. McCord
Summary: Domain wall dynamics in highly magnetostrictive microwires is sensitive to thermal treatment due to internal stress release and interaction with pinning sites. The shape and velocity of the domain wall can be mapped locally using magneto-optical Kerr effect. Different propagation modes of the domain wall, influenced by pinning effects, can be observed and analyzed using complementary techniques.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Meteorology & Atmospheric Sciences
Christopher Henri, Efstathios Diamantopoulos
Summary: This paper presents a new implementation of the RWPT approach for simulating solute transport in unsaturated porous media. The results show that the new Lagrangian model provides accurate solutions and is orders of magnitude faster than the Eulerian alternative.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Chemistry, Analytical
Dongjie Li, Haipeng Deng, Gang Yao, Jicheng Jiang, Yubao Zhang
Summary: In this paper, we focus on the challenge of noisy images caused by gamma radiation in image acquisition systems. We improve the multi-frame difference method and introduce an edge detection algorithm to segment and quantify noise. A Gaussian mixture model is established by analyzing the amplitude and quantity information of the noise, and it is combined with the random walk algorithm to predict image noise under different doses. The predicted noise shows high similarity to the actual noise, and it can be utilized effectively for denoising purposes using a deep residual network.
Article
Chemistry, Multidisciplinary
Ming Hu, Hongbo Chen, Hongru Wang, Stanislav Burov, Eli Barkai, Dapeng Wang
Summary: In this study, we investigate the Gaussian-to-exponential transition in the diffusion of poly(ethylene glycol) (PEG) in attractive nanoparticle-polymer mixtures by controlling the concentration and interaction of nanoparticles. The results are consistent with a modified large deviation approach for a continuous time random walk and Monte Carlo simulations involving polymer trapping via reversible adsorption to the nanoparticle surface. This work is significant in unraveling the fundamental physics behind the exponential decay of the displacement distribution observed in soft materials and nanomaterials.
Article
Engineering, Environmental
Sida Jia, Zhenxue Dai, Zhichao Zhou, Hui Ling, Zhijie Yang, Linlin Qi, Zihao Wang, Xiaoying Zhang, Hung Vo Thanh, Mohamad Reza Soltanian
Summary: Physical heterogeneities are prevalent in fracture systems and have a significant impact on transport processes in aquifers. Upscaling solute transport parameters is an effective method for studying variability in heterogeneous aquifers. This paper develops conceptual models for upscaling conservative transport parameters, focusing on dispersivity. The proposed Lagrangian-based transport model is validated and compared against experimental results, showing good agreement.
Article
Physics, Fluids & Plasmas
Henrik Christiansen, Suman Majumder, Wolfhard Janke
Summary: The study focuses on the nonequilibrium dynamics of the nonconserved Ising model with power-law decaying long-range interactions in two spatial dimensions at zero temperature. They found that the growth exponent is independent of the parameter sigma and the fractal dimension only recovers to the value of the nearest-neighbor Ising model in the large interaction region.
Article
Engineering, Electrical & Electronic
Jiesi Luo, Qiaoyuan Huang, Houde Dai, Shushu Wang, Yuguang Chen
Summary: Permanent magnet tracking (PMT) can be employed in robots and precision control. Existing PMT studies based on optimization algorithms are limited to stationary or low-speed motions. This study presents an extended Kalman filter (EKF)-based PMT method that can track the object at a higher speed while ensuring effective pose accuracy.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Nanoscience & Nanotechnology
Yasuhisa Omura
Summary: This paper revisits the master-equation-based approach to characterize transport in three-dimensional and low-dimensional few-electron systems. Theoretical derivations and experimental validations of electron density and capture time constant in systems with traps are presented. The capture-time constant model roughly reproduces its inverse-temperature dependence in practical systems, such as wire-type metal-oxide-semiconductor devices. The successful results of the theoretical approach suggest potential applications in understanding transport behavior in various materials.
Article
Multidisciplinary Sciences
Stuart T. Johnston, Matthew J. Simpson
Summary: From the smallest biological systems to the largest cosmological structures, spatial domains undergo expansion and contraction. Diffusive transport is a common phenomenon within these growing domains. Mathematical models have been widely used to study diffusive processes on growing domains, but the assumption of spatially uniform growth may not hold true in many cases.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Chemistry, Analytical
Zhiyu Xia, Zhengyi Xu, Dan Li, Jianming Wei
Summary: This study proposes a novel method, Outlier Mutation Optimization (OMO) algorithm, for tracking the source of chemical gas leakage. The OMO algorithm demonstrates high calculation accuracy and efficiency, making it a practical and effective solution for chemical industrial parks in responding to gas leakage accidents.
