Article
Engineering, Mechanical
Guido Zucca, Massimiliano Palmieri, Filippo Cianetti
Summary: This study focuses on the statistics of maxima for a sine wave superimposed to a Gaussian noise, particularly the maxima probability density function. The analysis shows that the Rician Distribution is a valid solution only when the sine frequency is very close to that of random noise, but in practical applications, the case where the sine wave frequency is before or after the random noise also needs to be considered.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Energy & Fuels
Maxime Juston, Nicolas Damay, Christophe Forgez
Summary: The modeling of a battery by an equivalent circuit model requires determining its parameters. This can be done by utilizing the transient response of a battery to a current pulse, often known as GITT. A common approach is to separate the OCV and overvoltage and extract the model parameters from the latter. However, estimating the OCV can be challenging, leading to errors in the overvoltage estimation for slow dynamics like diffusion. This study proposes a method to estimate the OCV and overvoltage during GITT, enabling the extraction of parameters associated with slow dynamics. The results are compared with traditional approaches.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Acoustics
Malte Krack
Summary: The paper introduces the representation and application of a nonlinear modal oscillator in mechanical system dynamics, proposing a method to simplify the system to a single nonlinear modal model with attached linear subsystems, expanding the practical range of nonlinear modes. Care should be taken to avoid significant higher harmonics and ensure quasi-steady state conditions for attachment dynamics.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Electrical & Electronic
Kevin Krueger, Haomiao Yuan, Jian Song
Summary: A new model for predicting reliability of electrical connectors from highly accelerated life tests (HALT) has been developed and validated. This study considers the influence of temperature, thermal cycling, and vibration on the failure rates and determines various stress levels based on different test parameters. Two automotive connectors are subjected to stress under two types of vibrational load, and the numbers of failures are compared to investigate the influence of the vibration test modes. The study also discusses the principles of determining the coefficient of vibration and provides a guideline for selecting appropriate vibration modes and levels to compare the reliability of different electrical connectors.
MICROELECTRONICS RELIABILITY
(2022)
Article
Mathematics, Applied
Jaqueline G. Mesquita, Aldo Pereira, Rodrigo Ponce
Summary: This paper introduces the definition of cosine and sine functions on time scales and investigates their properties and relationship with their infinitesimal generator. It also applies this theory to study abstract Cauchy problems on time scales in Banach spaces.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Energy & Fuels
Andrzej Dymarek, Tomasz Dzitkowski, Krzysztof Herbus, Piotr Ociepka, Andrzej Niedworok, Lukasz Orzech
Summary: The paper introduces a method to actively reduce vibrations in selected resonance zones of a tested object by determining parameters of an active force. By formulating a mathematical model, the method effectively reduces vibrations in the selected resonance zones to a given amplitude using active forces with desired dynamic properties.
Article
Mathematics
Rafik Aguech, Mohamed Abdelkader
Summary: This paper focuses on a two-dimensional symmetric random walk with reset. The first part provides the distribution results of each component. The second part presents some results regarding the final altitude Zn. Finally, using the probability generating function, the statistical properties of NnX, the number of resets of the first component returning to state 1 after n steps in the random walk, are analyzed.
Article
Engineering, Mechanical
E. Robbins, R. J. Kuether, B. R. Pacini, F. Moreu
Summary: This paper investigates the stabilizing effects of an electrodynamic shaker on strongly nonlinear structures in fixed frequency voltage control tests using both numerical and experimental methods. The various parameters that influence the stability of the coupled shaker-structure are revealed through numerical simulation and experimental testing, providing a better understanding of the performance of fixed frequency voltage control tests.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Lin-xin Li, Rui Li, Zhen-hao Huang, Hua Yang, Ming-quan Liu, Jun Xiang, Shahid Hussain, Xiang-qian Shen, Mao-xiang Jing
Summary: In this study, a multifunctional gradient structure PDOL/LLZTO composite electrolyte was designed, which exhibits good interface compatibility and efficient ion transport. Compared with traditional electrolytes, the composite electrolyte shows better performance in terms of electrode/electrolyte interface compatibility, interface impedance, and polarization, thereby improving the rate and cycle performances of solid-state lithium batteries.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Mathematics, Applied
Taras Lukashiv, Igor V. Malyk, Maryna Chepeleva, Petr V. Nazarov
Summary: This article investigates the stability of trivial solutions of stochastic differential equations with a random structure, particularly when concentration points are present. The proof of asymptotic stability relies on Lyapunov functions, additional constraints on jumps and jump times, and the Markov property. An example is provided to illustrate both stable and unstable conditions of the system. The novelty of this work lies in considering jump concentration points, which is not typically considered in classical works.
Article
Multidisciplinary Sciences
Songshan Zeng, Zhuoran Yang, Zaili Hou, Cheonjin Park, Michael D. Jones, Hao Ding, Kuangyu Shen, Andrew T. Smith, Henry X. Jin, Bing Wang, Han Jiang, Luyi Sun
Summary: Inspired by adaptive features in nature, this study proposes dynamic and responsive multifunctional devices based on multiscale structural design. The devices, which consist of metal nanocoating layers overlaid with other soft or rigid layers, exhibit various responses to mechanical strain, moisture, light, and heat. These devices can be applied in encryption, dynamic optics, and pressure-mapping sensors, with high reversibility and rapid responsiveness.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Engineering, Environmental
Chen Li, Qifang Sun, Qing Zhang, Chaoran Xu, Su Wang, Yue Ma, Xixi Shi, Hongzhou Zhang, Dawei Song, Lianqi Zhang
Summary: A multifunctional binder named PLG was developed to address the issues in Li-S batteries. PLG, generated by hydrogen-bonding interaction between polyacrylamide, locust bean gum, and gellan gum, suppresses electrode volume variation and anchors lithium polysulfides. The PLG-based electrode exhibits higher discharge capacity and improved reaction kinetics compared to the PVDF counterpart. This study demonstrates the promising performance of polysaccharide-based binder for wide temperature operable Li-S batteries.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Mathematics
Nada E. El-Meligy, Tamer O. Diab, Ashraf S. Mohra, Ashraf Y. Hassan, Wageda El-Sobky
Summary: This paper proposes a method to improve the security of SHA-512 by using hash functions based on DNA sequences and chaotic maps to hide information. By modifying the hash buffer values and additive constants, the complexity of the relationship between the original message and hash value is increased. Through testing and analysis, the proposed method shows good performance and security.
Article
Materials Science, Multidisciplinary
Konglin Wu, Min Ling, Peiyuan Zeng, Liang Zhang, Tao Wu, Pingli Guan, Weng-Chon Cheong, Zheng Chen, Zhen Fang, Xianwen Wei
Summary: Self-assembled Fe3O4 hierarchical microspheres were successfully synthesized using a one-pot synchronous reduction-self-assembling hydrothermal method without the need for additional reductants or additives. The prepared Fe3O4 microspheres exhibited high performance as anode materials for lithium-ion batteries, showing specific capacity of over 1000 mA h g(-1) after 270 cycles at 0.5 A g(-1). These microspheres also demonstrated good cycling stability and reversible performance, while also being used as efficient and magnetically recyclable catalysts for hydrogenation reactions.
SCIENCE CHINA-MATERIALS
(2021)
Article
Engineering, Civil
Gonzalo Barrios, Tam Larkin, Nawawi Chouw
Summary: This study investigated the effect of distance on interaction between adjacent structures and the impact of neighboring buildings on the dynamic properties of a structure through experiments on single degree-of-freedom structures in a sand-filled laminar box. The research found that as the number of participating structures increased, the fundamental frequency also increased, with the damping ratio being significantly influenced by the soil, achieving the lowest damping ratio with an intermediate number of structures.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
