Article
Chemistry, Multidisciplinary
Juan A. Ramos-Guivar, Carlo A. Tamanaha-Vegas, Fred Jochen Litterst, Edson C. Passamani
Summary: Ferromagnetic nanostructures were studied using atomistic simulations with Monte Carlo and Landau-Lifshitz-Gilbert methods. The influence of particle size, shape, and interfacial magnetic exchange on the magnetization and magnetic hysteresis behavior was analyzed, showing that finite-size effects play a role in the Curie temperature dependence of the nanoparticles. Adjusting the core size in the Co@Gd core-shell structure allowed for control of the critical temperature, with different interfacial exchange energies leading to varied coercive field values.
Article
Materials Science, Multidisciplinary
Zhong-yue Gao, Wei Wang, Lei Sun, Lin-mei Yang, Bao-yun Ma, Peng-sheng Li
Summary: In this study, Monte Carlo simulation was used to investigate the dynamic magnetic behaviors of ferrimagnetic mixed-spin (3/2, 5/2) Ising-type borophene nanoribbons with core-shell structure. The effects of crystal field, exchange couplings, and time-dependent oscillating magnetic field on the dynamic magnetic characteristics were discussed. Additionally, multiple-loop hysteresis phenomena were observed in the system.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Evangelos Aslanidis, Evangelos Skotadis, Dimitris Tsoukalas
Summary: In this study, a Monte-Carlo tool is introduced to simulate platinum nanoparticle based strain-sensors on flexible substrates. The tool allows for adjusting NP surface coverage, calculating conductive paths, and representing the system with an equivalent circuit using a Laplacian matrix for effective resistance calculation. The software is capable of predicting strain-sensitivity, making it a powerful computational tool for design optimization, with potential applications in other flexible electronic materials.
Article
Agriculture, Multidisciplinary
John N. Ng'ombe, B. Wade Brorsen
Summary: For decades, researchers have relied on small-scale agronomic experiments to provide input management recommendations to farmers. However, these experiments often have large standard errors and uncertainty about their generalizability. To address these limitations, there has been a movement towards on-farm field experiments. This study used a Bayesian decision-theoretic approach to examine the best methods for conducting these experiments and determining when it is most profitable to quit them.
PRECISION AGRICULTURE
(2022)
Article
Polymer Science
Zhong-yue Gao, Dan Lv, Wei Wang, Jie Yu
Summary: In this study, the dynamic magnetic behaviors of a ferrimagnetic mixed spin-1 and spin-3/2 Ising ladder-type graphene nanoribbon under a time-dependent magnetic field were analyzed using Monte Carlo simulation. The impact of various factors on the magnetic properties and hysteresis behaviors of the system was investigated, revealing the possibility of double-loop hysteresis behavior under certain parameters.
Article
Physics, Fluids & Plasmas
Damien Paul Foster, Debjyoti Majumdar
Summary: This study focuses on the critical behavior of lattice models of polymers with monomers carrying a magnetic moment, showing a first-order character of both magnetic transition and polymer collapse in three dimensions, while a continuous transition is observed in two dimensions. Finite-size scaling is used to estimate critical exponents and transition temperature in the absence of an external magnetic field.
Review
Green & Sustainable Science & Technology
Tianyu Wang, Shouceng Tian, Gensheng Li, Liyuan Zhang, Mao Sheng, Wenxi Ren
Summary: This article provides an overview of the adsorption mechanism of shale gas and the importance of molecular simulation, emphasizing the crucial role of accurate description of shale compositions and structures for simulation.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Mechanics
Haibing Peng
Summary: Despite the widespread use of Navier-Stokes equations in computational-fluid-dynamics (CFD), there are still unanswered questions due to the absence of considering the statistical nature of discrete air molecules. In this study, we propose a statistical mechanics-based approach called the volume-element method, which allows for the numerical evaluation of aerodynamic lift and drag. We obtained pressure and friction values as a function of the angle of attack for flat-plate airfoils, and this method can be directly applied to convex-shape airfoils and combined with Monte Carlo simulations for concave-shape airfoils. This approach not only has implications for aerodynamic applications, but also opens up possibilities for further applications in Boson or Fermi gases.
Article
Polymer Science
Yaqian Guo, Wen Luo, Jiang Zhang, Wenbing Hu
Summary: This study investigates the influence of three physical effects of coexisting noncrystallizable components, namely dilution, microphase separation, and asymmetric block rigidity, on the size diversity of crystalline microdomains in semicrystalline multiblock copolymers. Dilution effects are found to result in larger or smaller crystalline microdomains depending on the concentration of crystallizable blocks. Microphase separation, on the other hand, leads to more, rather than smaller, crystalline microdomains, thereby enhancing size diversity in a different manner.
Article
Physics, Multidisciplinary
Yu-Rong Shu, Shao-Kai Jian, Shuai Yin
Summary: This study investigates the nonequilibrium imaginary-time dynamics of the deconfined quantum critical point (DQCP) in the two-dimensional J-Q3 model. It finds that the spinon confinement length increases proportionally to time, rather than the usual correlation length. Additionally, it discovers that the order parameters of the Neel and the valence-bond-solid orders can be controlled by different length scales, although they satisfy the same equilibrium scaling forms. A dual dynamic scaling theory is proposed. These findings not only contribute to a new understanding of nonequilibrium criticality in DQCP, but also provide a controllable method for studying dynamics in strongly correlated systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Sumitra Rudra, Damien Paul Foster, Sanjay Kumar
Summary: In this study, we obtained the (numerically) exact phase diagram of a magnetic polymer on the Sierpinsky gasket embedded in three dimensions using the renormalization group method. We observed distinct phases and phase boundaries between them. By including a four-site interaction in the model, we discovered rich critical behaviors, including the phenomenon of reentrance between collapsed and swollen states of the magnetic polymer.
Article
Physics, Multidisciplinary
K. L. Zhang, Z. Song
Summary: The study reveals that applying a nonlocal non-Hermitian perturbation to an Ising chain merges the topological Kramer-like degeneracy in the ferromagnetic phase, with distinct dynamic responses for different quantum phases. The phase diagram at zero temperature is completely preserved at finite temperatures.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Vladimir P. Zhdanov
Summary: Chemisorption can cause reshaping of metal nanocrystallites with surface tension dependent on adsorbate coverage. Disagreement exists on how to calculate surface tension in this case. Statistical physics laws clarify that surface tension can be described uniformly under different adsorption scenarios.
Article
Nanoscience & Nanotechnology
Takuma Okazaki, Hiroshi Sugimoto, Tatsuki Hinamoto, Minoru Fujii
Summary: A Monte Carlo simulation was developed to predict the reflection color of silicon nanoparticle inks, demonstrating a strong dependence on concentration. To expand the controllable range of hue, saturation, and brightness of the inks, a mixture ink with light-absorbing carbon black nanoparticles was developed, allowing for vivid reflection colors under room light.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Condensed Matter
A. M. Belemuk
Summary: In this study, we investigate the influence of impurity doping on the formation of spiral structure in a chiral magnet. Our calculations reveal that the addition of impurity changes chiral fluctuations and leads to a decrease in spiral wave vector, eventually causing it to vanish.
SOLID STATE COMMUNICATIONS
(2022)