Article
Mechanics
Chuang-Shi Shen, Huan-Fang Wang, Fei Yao, Bo Li, Bo Zhou, Xi-Ning Zhao, Yong-Wang Zhang, Ze -Wei Li
Summary: This study proposes a peeling model based on the cohesion zone model and Euler-Bernoulli beam equation to investigate the peeling process and potential instability of heterogeneous film. The analysis reveals nine peeling processes, with only one stable and the others exhibiting instability at specific positions. Additionally, the study finds an optimal length fraction of the stiff section for enhancing adhesive performance, which is influenced by the strength of the interface material. Furthermore, the maximum peeling force is correlated with the bending stiffness ratio, interfacial strength, interfacial toughness, and period length of heterogeneous film.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Computer Science, Artificial Intelligence
Yuanbin Fu, Jiayi Ma, Xiaojie Guo
Summary: This paper presents a hierarchical image organization framework based on scale-space perspective. It converts the original complex problem into a series of two-component separation sub-problems, and provides theoretical and experimental results to demonstrate its effectiveness and superiority.
COMPUTER VISION AND IMAGE UNDERSTANDING
(2023)
Article
Chemistry, Physical
Adyant Agrawal, Simon Gravelle, Catherine Kamal, Lorenzo Botto
Summary: Combining molecular dynamics and continuum simulations, this study investigates the dynamics of peeling front in a system of multilayered graphene nanosheets immersed in water. The results show that the shape of the sheet is approximately independent of the pulling velocity.
Article
Engineering, Mechanical
M. Fraldi, S. Palumbo, A. R. Carotenuto, A. Cutolo, N. M. Pugno
Summary: In this study, a general formulation of multiple peeling theory considering geometric and constitutive nonlinearities was proposed. Analytical methods were used to provide closed-form solutions and explicit formulas for predicting pull-off critical forces and optimizing adhesion strength, along with tracing the evolution of the delamination process. The study recovered Kendall and previous linear multiple peeling theory approaches as limit cases, demonstrating the asymptotic nature of the detaching phenomenon observed in experiments and providing insights into the role of nonlinearities and pre-stress in adhesion mechanisms.
EXTREME MECHANICS LETTERS
(2021)
Article
Mechanics
Zihao Wang, Xiuqing Xing, Teizhi Sun, Guiyong Zhang
Summary: In this paper, joint principal component analysis (JPCA) and fusion principal component analysis (FPCA) are used to process multivariate data to obtain the static and dynamic characteristics of the cavitation flow field. Static flow field segmentation can obtain time-invariant, physically related structures of unsteady flow, while dynamic flow field segmentation can obtain time-varying, physically related structures. The results show that JPCA or FPCA is effective in expressing multivariate features.
Article
Mathematics
Adrian Dumitrescu
Summary: Given a point set in the plane, the number of ways to peel it off until no point remains depends on the position of the points. Convex position has n! ways, while the minimum number is still unknown.
Article
Engineering, Electrical & Electronic
Faeze Heydaryan, Jie Luo
Summary: The paper introduces a distributed MAC framework to support hierarchical user groups in a random multiple access system. It ensures channel availability above a pre-determined threshold when the number of primary users is small and drives transmission probabilities of secondary users to zero when the number of primary users is large, without rejecting channel access to primary users.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Mathematics
Shuxian Lun, Zhenduo Sun, Ming Li, Lei Wang
Summary: The MH-ESN is an improved training method that enhances training efficiency by introducing a hierarchical structure and multiple reservoirs, and exhibits higher accuracy in complex time series prediction compared to Leaky-ESN.
Article
Physics, Fluids & Plasmas
Xiangshuo Tang, Yue Yu, Alparslan Oztekin
Summary: This paper proposes an asymptotic solution to the maximum entropy state problem using perturbation theory, aiming to improve the numerical stability of the lattice Boltzmann method. The experimental results verify the effectiveness and superiority of this approach.
Article
Biochemistry & Molecular Biology
Alexandre Blanco-Gonzalez, Angel Pineiro, Rebeca Garcia-Fandino
Summary: This article discusses the hierarchical structure of membrane models and defines different levels of structure. By analyzing lipid composition, interaction between layers, the existence and interaction of domains caused by lipid behavior, and the perturbation of lipid organization around macromolecules embedded in the membrane, primary, secondary, tertiary, and quaternary structures are defined respectively. Molecular Dynamics simulations are used to support this proposal.
COMPUTATIONAL AND STRUCTURAL BIOTECHNOLOGY JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Tingting Xu, Bin Wu, Linxiao Hou, Yanran Zhu, Fangmeng Sheng, Zhang Zhao, Yun Dong, Jiandang Liu, Bangjiao Ye, Xingya Li, Liang Ge, Huanting Wang, Tongwen Xu
Summary: This study reports porous organic cage membranes with hierarchical channels, which can selectively separate monovalent ions from divalent ions. The dual nanometer-sized cavities provide pathways for fast ion transport with high ion permselectivity. Molecular dynamics simulations illustrate the ion transport trajectory and offer guidelines for developing efficient ion separation membranes.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Applied
Marcel P. Georgin, Michael S. McDonald
Summary: The experimental study investigated the influence of keeper geometry on electron transport, revealing that increasing the hole-pattern spread reduces the electric field in the plume and increases the pressure contribution to transport. Additionally, it was found that multiple orifice keepers increase ion-neutral collisional damping.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Andrea Silva, Erio Tosatti, Andrea Vanossi
Summary: This study investigates the peeling process of graphene nanoribbons (GNRs) on a metal substrate at the nanoscale. Analytical modeling and numerical simulations reveal a novel setup where the GNRs have an elastically tethered tail end. Surprisingly, nontrivial scaling exponents are found to regulate the peeling evolution, affecting the adhered length, peeling force, and peeling angle. These findings are supported by realistic MD simulations.
Article
Multidisciplinary Sciences
Yuzhu Ma, Hongjin Zhang, Runfeng Lin, Yan Ai, Kun Lan, Linlin Duan, Wenyao Chen, Xuezhi Duan, Bing Ma, Changyao Wang, Xiaomin Li, Dongyuan Zhao
Summary: In this study, a nanodroplet remodeling strategy is proposed for the synthesis of hierarchical multi-chambered mesoporous silica nanoparticles with tunable architectures. The dual-chambered nanoparticles have a high surface area and two interconnected cavities, allowing for separate anchoring of multiple species without mutual interference. Additionally, the dual-chambered mesoporous nanoreactors prepared using this strategy exhibit efficient mass transfer, leading to improved selectivity of the target product.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
Agnes Poks, Elisabeth Luchini, Markus Fallmann, Camillo Signor, Andreas Wurzinger, Dominik Radler, Stefan Jakubek, Martin Kozek
Summary: This paper presents a hierarchical distributed control strategy for multiple refrigeration units, aiming to minimize energy consumption and reduce latency times by implementing model predictive control and a mixed-integer optimization algorithm. The proposed approach provides a versatile and efficient solution for meeting the thermal demand of central plants in a multi-agent framework.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Chemistry, Multidisciplinary
Omar Tricinci, Francesca Pignatelli, Virgilio Mattoli
Summary: Bioinspired functional surfaces, such as the Salvinia-effect, show remarkable properties in wettability and drag force reduction. By combining 3D laser lithography and microfabrication techniques, surfaces inspired by the morphology and chemical coating of Salvinia Molesta leaves are created. These surfaces exhibit super-hydrophobicity, tunable adhesion, and remarkable underwater air retention capability. In hydrodynamic conditions, they also demonstrate significant drag force reduction and energy savings of up to 40%.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Riddhi Das, Saravana Prashanth Murali Babu, Francesco Visentin, Stefano Palagi, Barbara Mazzolai
Summary: This study presents the design and development of a modular soft robot based on a peristaltic soft actuator (PSA). The PSA can switch between two active configurations by altering the input pressure, generating both axial penetration and radial anchorage forces through bidirectional deformation. The performance of the PSA depends on the fluid confined in the elastomer chamber, allowing the robot to perform peristaltic locomotion in different media. The study also investigates the role of friction through the attachment of passive scales resembling earthworm setae to the ventral side of the robot.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Luca Cecchini, Stefano Mariani, Marilena Ronzan, Alessio Mondini, Nicola M. Pugno, Barbara Mazzolai
Summary: By studying the hierarchical structures and anatomical features of Geraniaceae seeds, researchers have successfully designed a bioinspired soft robot using biodegradable and hygroscopic polymers. This robot can move and adapt like natural seeds, reaching high torque and lifting capabilities.
Article
Chemistry, Multidisciplinary
Frank Marco den Hoed, Andrea Ottomaniello, Omar Tricinci, Luca Ceseracciu, Marco Carlotti, Patrizio Raffa, Virgilio Mattoli
Summary: This study presents a novel technique for the realization of 3D micro-structures on complex surfaces with high conformability. The method involves two-photon polymerization of micro-structures on polymeric nano-membranes, which can be efficiently transferred to a target surface. Ultra-thin polymeric films are used as support to suspend and transfer the printed micro-structures. The technique offers flexibility in choice of structures, materials, transfer procedures, and substrate geometries.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
G. J. Chaplain, A. S. Gliozzi, B. Davies, D. Urban, E. Descrovi, F. Bosia, R. V. Craster
Summary: By 3D printing samples from a photo-responsive polymer, we can dynamically fine-tune the operating frequency of a topological waveguide using laser excitation, addressing the potential weakness of fixed narrow band of frequencies. This approach significantly improves upon existing static tunability strategies based on modifying the geometry. We demonstrate our method using a version of the classical Su-Schrieffer-Heeger model.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Mechanical
M. Mazzotti, A. Foehr, O. R. Bilal, A. Bergamini, F. Bosia, C. Daraio, N. M. Pugno, M. Miniaci
Summary: Hierarchy provides unique opportunities for advanced material design with superior properties. However, its role in vibration mitigation and wave manipulation remains unclear. In this study, we demonstrate that designing non self-similar hierarchical geometries enables the creation of periodic structures supporting multiple highly attenuative and broadband bandgaps at different frequencies. The type of band gap mechanism is identified by examining the vibrational mode shapes and dispersion diagram of the unit cell.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Medicine, Research & Experimental
Nasim Shadmani, Pooyan Makvandi, Maliheh Parsa, Amir Azadi, Keivan Nedaei, Negin Mozafari, Narges Poursina, Virgilio Mattoli, Franklin R. Tay, Aziz Maleki, Mehrdad Hamidi
Summary: The blood-brain barrier is a protective barrier that prevents potential damages to the brain from chemicals in the bloodstream. This study showed that modifying mesoporous silica nanoparticles with TAT peptide improves the penetration of methotrexate into the brain. The results suggest that this nanosystem could be a promising drug carrier to overcome the blood-brain barrier and deliver methotrexate into the brain.
MOLECULAR PHARMACEUTICS
(2023)
Article
Multidisciplinary Sciences
Federica Ongaro, Federico Bosia, Nicola M. Pugno
Summary: Suture joints play a crucial role in the mechanical properties of biological structures, but their effects on vibration attenuation and dynamic loads are not well understood. This paper investigates the dynamic response of periodic layered media with suture joints using an analytical approach. The results show that the suture geometry and material properties have a significant influence on the system, and the addition of hierarchy can widen the bandgaps and shift them to higher frequencies. A synergy between hierarchy and structure is also observed, providing superior wave attenuation levels. These findings suggest a potential design concept for bioinspired devices with efficient and tailorable wave attenuation properties.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Polymer Science
Ottavia Racchi, Rebecca Baldassari, Esteban Araya-Hermosilla, Virgilio Mattoli, Pierpaolo Minei, Alfonso Pozio, Andrea Pucci
Summary: In this study, efficient anion-exchange membranes (AEMs) were prepared by functionalizing an aliphatic polyketone with 1-(3-aminopropyl)imidazole through the Paal-Knorr reaction. The derived membranes showed good thermal stability, mechanical properties, and comparable ionic conductivity to a commercially available AEM. Future efforts will focus on increasing the robustness of these membranes to meet the requirements for electrolytic cell applications.
Article
Nanoscience & Nanotechnology
Arianna Mazzotta, Virgilio Mattoli
Summary: Conformable electronics has been extensively studied for monitoring human physiological signals. This study explores the possibility of using conformable electronics as active devices to provide stimuli to the human body. A new approach using localized heat generation and deformation of a thin membrane is proposed to elicit tactile sensations on human skin. The device can be quickly fabricated using inkjet printing and transfer tattoo paper, and it demonstrates the potential for developing wearable tactile displays.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Ikue Hirata, Arianna Mazzotta, Pooyan Makvandi, Ilaria Cesini, Chiara Brioschi, Andrea Ferraris, Virgilio Mattoli
Summary: Peripheral intravenous catheters are used for various purposes, but can unintentionally cause extravasation when directed outside of the vein. This article discusses the mechanism of extravasation and highlights sensorized devices for detection. The review provides an overview of recent technologies to aid in the early detection of extravasation.
Article
Robotics
Serena Armiento, Fabian Meder, Barbara Mazzolai
Summary: Soft (bio)hybrid robotics aims to connect living beings with artificial technology. Recent advancements allow for the conversion of wind-driven leaf fluttering and raindrop kinetic energy into electricity by coupling plant leaves with artificial leaves. The integration of an electrification layer and exposed electrodes on the artificial leaf's upper surface enables the production of significant current when raindrops land and spread on the device. This technology has the potential for multi-source energy harvesting and self-powered sensing applications in various fields.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2023)
Article
Robotics
Serena R. M. Pirrone, Emanuela Del Dottore, Luc Sibille, Barbara Mazzolai
Summary: This letter presents a methodology using a 3-D numerical model based on the DEM to investigate soil penetration requirements for designing robotic soil excavators and explorers. The study analyzes the penetration process based on the intruder diameter to median particle size ratio and estimates the soil resistance force for autonomous penetration systems in cohesionless granular soil. The research compares different penetration strategies, providing important guidelines for designing artificial penetrating systems for underground exploration.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2023)
Editorial Material
Nanoscience & Nanotechnology
Fabrizio Antonio Viola, Virgilio Mattoli
ADVANCED ELECTRONIC MATERIALS
(2023)
Editorial Material
Chemistry, Multidisciplinary
Arianna Mazzotta, Ikue Hirata, Pooyan Makvandi, Ilaria Cesini, Chiara Brioschi, Andrea Ferraris, Virgilio Mattoli
