Article
Materials Science, Multidisciplinary
Jiong Wang, Chengkai Fan, Paul Steinmann
Summary: The governing equation system for modeling the high-frequency dynamic magneto-mechanical response of MSMAs is formulated based on Hamilton's principle. The system includes Maxwell's equations, mechanical dynamic equations, evolution laws for internal variables, and criteria for predicting twin interface motion. This lays the foundation for future numerical simulations and mechanism analyses.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Biochemical Research Methods
Gyula Vigh, Bohuslav Gas
Summary: The carrier ampholytes-based isoelectric focusing has evolved from a closed system with steady pH gradient to an open system with transient pH gradient. The open system follows a two-stage model, where a rapid IEF process forms the pH gradient in the first stage, and isotachophoretic processes degrade the pH gradient in the second stage. The outcome of the process is determined by ionic mobilities, pK(a) values, and loaded amounts of all components, and a steady state cannot be achieved in terms of spatial coordinate.
Article
Mechanics
H. R. Mojiri, S. Jedari Salami
Summary: In this article, the free vibration and dynamic transient response of a multilayer polymer nanocomposite beam supported by an elastic foundation reinforced with graphene platelets (GPLs) are investigated in a thermal environment. The study presents theoretical formulations based on Hamilton's principle and Timoshenko beam theory relationships. The numerical results obtained using the generalized differential quadrature method (GDQM) show that adding a small amount of GPLs and placing more GPLs near the top and bottom surfaces of the beam effectively increases its natural frequencies. The influences of various factors on the vibration behavior and transient response are also presented.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Chemistry, Multidisciplinary
George Lisensky
Summary: In this experiment, different colored high or low spin Ni(II) complexes are synthesized through a double replacement reaction and characterized using infrared spectroscopy. The correlation between experimental data and ligand-field theory is studied.
JOURNAL OF CHEMICAL EDUCATION
(2022)
Article
Optics
Rongfang Liu, Hong-Mei Zou, Jianhe Yang, Danping Lin
Summary: This paper solves a two-level atom coupled with a double Lorentzian spectrum using pseudomode theory, obtaining an analytic representation of the density operator. It also investigates the entanglement witness and entropy uncertainty, obtaining analytical representations of entanglement, uncertainty, and their relationship. The environmental effects of the double Lorentzian spectrum are explained by non-Markovianity, and the influence of the Zeno effect on entanglement witness and uncertainty is studied.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Nuclear Science & Technology
Xiangjie Qi, Zichen Zhao, Peng Ai, Peng Chen, Zhongning Sun, Zhaoming Meng
Summary: The experimental research on the flow characteristics of an open natural circulation system investigates the mechanism behind the system's flow behaviors. The study examines the influence of heating power, inlet subcooled, and cooling tank level on the flow characteristics. The findings reveal five flow types within the experimental conditions: single-phase stable flow, flash and geyser coexisting unstable flow, flash stable flow, flash unstable flow, and flash and boiling coexisting unstable flow.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Daniela De Luchi, Renato Bonomi
Summary: This study presents the successful development of a supramolecular system formed by gold nanoparticles, functionalized with a positively charged thiol group, by a group of 12 high school students supported by their chemistry teacher. The system exhibited aggregation and disaggregation behaviors by adding polyanionic ATP as fuel and an enzyme capable of hydrolyzing ATP P-O bonds. The students were divided into three groups to complete different tasks, enhancing their problem-solving skills, advanced lab instrument usage, and research capabilities.
JOURNAL OF CHEMICAL EDUCATION
(2023)
Article
Chemistry, Multidisciplinary
Heonmoo Kim, Yosoon Choi
Summary: We propose a smart hopper system that can automatically remove blockages caused by rocks dropped into hoppers at mining sites. By capturing RGB-D images of the hopper models and using machine vision techniques, the system accurately identifies rocks and simulates the necessary actions for removal using a robot arm. The system's accuracy is confirmed through evaluation of the quantity and location of rocks.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Marine
Shueei-Muh Lin, Wen-Rong Wang, Hsin Yuan
Summary: Ocean current power generation systems are typically secured deep in the seabed using mooring systems resembling ropes. These ropes are long and provide tension but not compression, with large and unstable dynamic displacement. To optimize efficiency, a stable mooring system is crucial, along with a stable and minimally dynamic displacement of the ocean current inverter, safe and long-lasting mooring ropes, and a small dynamic tension. This study investigates the transient behavior of a mooring system composed of an inverter platform, pontoon, and ropes under initial conditions, proposing an analytical method and a double-rope parallel mode to enhance fracture strength, decrease tension, and increase safety factor.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Environmental
Jianying Song, Jianlong Wang, Wenhai Wang, Liuwei Peng, Hongxin Li, Changhe Zhang, Xing Fang
Summary: The study compared different infiltration models and found that the Horton model performed well, with parameters easily obtainable through monitoring. Therefore, it can be used to describe the infiltration performance of PBPs effectively.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Mathematical & Computational Biology
Zhao Chaofeng, Zhai Zhibo, Du Qinghui
Summary: This paper introduces a class of stochastic harvesting population system with Fractional Brownian Motion (FBM) and discusses the conditions for optimization when the system has stochastic noise with memorability. The study presents necessary and sufficient conditions for optimization using stochastic maximum principle, Hamilton function and Ito formula when the external environment impacts the FBM system. An example is provided to demonstrate the obtained theoretical results, which extends the certainty population system.
MATHEMATICAL BIOSCIENCES AND ENGINEERING
(2021)
Article
Engineering, Biomedical
A. V. Mancino, F. E. Milano, M. R. Risk, L. E. Ritacco
Summary: Introduces an open-source navigation system using a multiple registration approach to track instruments, implants, and bones during surgery. The system's precision and accuracy were measured through analytical error derivation and phantom experiments. A reliability prediction model was also developed. A complete workflow for a clinical case was conducted to demonstrate the system's feasibility.
INTERNATIONAL JOURNAL OF COMPUTER ASSISTED RADIOLOGY AND SURGERY
(2023)
Article
Automation & Control Systems
Mingxing Yuan, Xuebo Zhan
Summary: This article proposes an online time-optimal trajectory optimization-based saturated adaptive robust control algorithm to guarantee the stability and fast transient performance of a direct-drive system subject to modeling uncertainties, velocity, and input constraints. The proposed control approach consists of two levels, with a saturated adaptive robust controller (SARC) handling modeling uncertainties and feedback constraint, and an online time-optimal trajectory optimization algorithm dealing with feedforward and velocity constraints. Comparative experiments on a linear motor demonstrate the theoretical results and superiorities of the proposed two-level control approach.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Nuclear Science & Technology
Mario Mendoza, Pavel V. Tsvetkov
Summary: Various microreactor designs are being developed to meet the electricity and heat production requirements in a variety of applications, such as power generation for remote communities and military bases. An intelligent Fault Detection and Diagnosis Monitoring System (FDDMS) is necessary to enable unattended operations, and this research introduces the concept and approach of such a system. The first module of the FDDMS, the Power Transient Module, has been developed to accurately identify reactor operations based on power transients.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Environmental Sciences
Ranabir Chakraborty, Tapan Jyoti Purakayastha, Elise Pendall, Saptaparnee Dey, Niveta Jain, Sarvendra Kumar
Summary: This study assessed the efficacy of alternative nitrogenous fertilizers in mitigating greenhouse gas and ammonia emissions in a rice-wheat cropping system in northern India. The results showed that neem coated urea (NCU) and urea ammonium sulfate (UAS) had different effects on global warming potential (GWP) depending on residue treatment, while urea + urease inhibitor (UUI) and urea + urease inhibitor + nitrification inhibitor (UUINI) were effective in both residue treatments. UUI and UUINI were more effective in reducing GWP than NCU.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
