Article
Geochemistry & Geophysics
Xiaomin Liu, Tiantian Feng, Xiaofan Shen, Rongxing Li
Summary: This article proposes a novel multi-image super-resolution network called PMDRnet to improve the spatial resolution of passive microwave images for monitoring polar sea ice changes. Experimental results demonstrate that PMDRnet outperforms current state-of-the-art methods and can generate finer and sharper sea ice edge features.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Mechanics
Samir Emam, Walter Lacarbonara
Summary: This paper presents exact solutions for the buckling loads and postbuckling states of extensible, shear deformable beams. The dependence of the buckling load on the length-to-radius of gyration is discussed, as well as the significant effects of extensibility and shear deformation on the buckling loads and the postbuckling response.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Engineering, Civil
Andras Szekrenyes
Summary: This work applied the differential quadrature method to composite plates with delamination, using two and four equivalent single layers to provide numerical results. The convergence of deflection was compared to analytical and finite element models, showing deviations between upper and lower bounds. It was found that the method of two equivalent single layers exhibits an oscillatory phenomenon in mode-II components. Additionally, the importance of proper grid structure to avoid waviness in mode-III energy release rate was highlighted when using four equivalent single layers.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
H. Soleimani, T. Goudarzi, M. M. Aghdam
Summary: A structural model is proposed for analyzing the mechanical responses of folded quadrilateral plates, incorporating the elastic deformation and folding behavior of the plates. The model accurately accounts for complex responses including deformation, vibration characteristics, and instabilities. It establishes a foundation for analyzing the large scale responses of Origami/Kirigami patterns based on the local characteristics of their structure.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Civil
Arash Sahraei, Payam Pezeshky, Siriwut Sasibut, Feng Rong, Magdi Mohareb
Summary: This study develops a theory for the static analysis of thin-walled members with general asymmetric cross-sections, capturing global and through-thickness warping, as well as shear deformation effects. Closed-form solutions are formulated for beams with asymmetric, monosymmetric, point symmetric, and doubly symmetric cross-sections, and comparisons with previous theories verify the validity of the present theory and quantify the effects of shear deformation and warping.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Electrical & Electronic
Jian Zhao, Guangqian Kong, Xun Duan, Huiyun Long, Yun Wu
Summary: Video super-resolution (VSR) is a process that reconstructs high-resolution videos from low-resolution ones. To improve the temporal consistency and SR results of previous VSR methods, we proposed a nonlocal deformable alignment and frame recursive progressive fusion (RPF) network. This network aligns frame features using nonlocal operations and recursively models hidden information and alignment features, resulting in better temporal consistency and SR results. Experimental results on three public VSR datasets demonstrate that our method achieves state-of-the-art performance on the VSR task.
JOURNAL OF ELECTRONIC IMAGING
(2023)
Article
Engineering, Civil
Arash Sahraei, Payam Pezeshky, Siriwut Sasibut, Feng Rong, Magdi Mohareb
Summary: This study develops a finite element formulation for the natural vibration and dynamic analysis of thin-walled members with asymmetric cross-sections. The formulation accurately predicts the natural frequencies and vibration modes and captures the significance of shear deformation effects.
THIN-WALLED STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Reza Ansari, Emad Hasrati, Jalal Torabi
Summary: This study numerically investigates the vibration of higher order shear deformable carbon nanotube reinforced composite (CNTRC) spherical panels under initial external pressure. The functionally graded nanocomposite is reinforced with non-uniformly distributed carbon nanotubes. The study formulates the problem using the higher order shear deformation shell theory (HSDT) and a variational differential quadrature numerical approach. The main novel aspects of this research include the derivation of the variational formulation of nanocomposite spherical panels based on HSDT and the investigation of the effects of external pressure on vibration behavior. Several numerical examples are provided to examine the impact of geometrical and material factors on the vibration of pressurized functionally graded CNTRC spherical panels. The results show that internal pressure has the greatest influence on the vibrational behavior of thicker panels.
ENGINEERING WITH COMPUTERS
(2022)
Article
Construction & Building Technology
Amina Attia, Amina Tahar Berrabah, Abdelmoumen Anis Bousahla, Fouad Bourada, Abdelouahed Tounsi, S. R. Mahmoud
Summary: A 4-unknown shear deformation theory is used to study the vibration of functionally graded plates under thermal conditions. The theory has shown good capabilities in simulating vibration responses compared to benchmark solutions and solutions available in literature.
STEEL AND COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Andras Szekrenyes
Summary: This work explores the application of different shear and normal deformation theories in delaminated sandwich shells with constant radii of curvature. The governing equations are deduced through the virtual work principle and the developed shell models are validated through several examples involving different scenarios. Results indicate that the proposed models accurately capture mechanical fields along the delamination front. The J-integral and energy release rates are also compared with satisfactory agreement.
COMPOSITE STRUCTURES
(2021)
Article
Biochemistry & Molecular Biology
Alexandra E. Lagogianni, Fathollah Varnik
Summary: One of the key issues in the application of metallic glasses as structural components is the localization of deformation in shear bands. This study focuses on the process of local temperature rise due to viscous heat generation and discusses its consequences in the context of current research in the field.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Mechanics
Suiyin Chen, Rong Geng, Wenxiong Li
Summary: This paper extends the higher-order shear deformable mixed beam element model with rational shear stress distribution to vibration analysis of functionally graded (FG) beams, and the numerical results show that the mixed beam element model performs significantly better in vibration frequencies compared to other models. Rational distribution of transverse shear stress is crucial for achieving high-precision solutions in vibration analysis of FG sandwich beams.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Zanhang He, Jianghong Xue, Sishi Yao, Yongfu Wu, Fei Xia
Summary: A modified first order shear deformation theory is proposed for laminated micro-nano plates with couple stress components involved, based on mechanics of composite materials and Koiter's theory. Governing equations with size-dependent effect are derived and applied to investigate the buckling and free vibration of laminated micro-nano plates. The proposed theory is validated and shown to be efficient and accurate through comparisons with existing models and ABAQUS analysis.
COMPOSITE STRUCTURES
(2021)
Article
Energy & Fuels
Penglin Liu, Jun Li, Hongwei Yang, Hui Zhang, Wei Lian, Reyu Gao, Xiaojun Zhang
Summary: This study presents a method to control casing shear deformation caused by fault slip using a cement sheath with hollow glass microspheres. The mechanism of hollow glass microspheres in controlling casing shear deformation is analyzed, and a numerical model is established to evaluate the effect. It is found that increasing the mass content of hollow glass microspheres in the cement sheath can effectively prevent casing shear deformation.
Article
Engineering, Civil
Wachirawit Songsuwan, Nuttawit Wattanasakulpong, Thuc P. Vo
Summary: This study investigates the nonlinear vibration of functionally graded-graphene platelet-reinforced composite (FG-GPLRC) beams under various time-dependent forces. The material distributions are described by continuous functions with four patterns of reinforcement. The nonlinear results are obtained using the Gram-Schmidt-Ritz method and iteration process. The effects of graphene nanoplatelets weight fraction, material distribution types, and beam geometry on the nonlinear dynamic deflection are studied and compared between continuous and multi-layers FG-GPLRC beams.
THIN-WALLED STRUCTURES
(2022)
Article
Geochemistry & Geophysics
Carlo Meletti, Warner Marzocchi, Vera D'Amico, Giovanni Lanzano, Lucia Luzi, Francesco Martinelli, Bruno Pace, Andrea Rovida, Matteo Taroni, Francesco Visini
Summary: This paper describes the main structure and outcomes of the new probabilistic seismic hazard model for Italy, MPS19, and highlights the innovative features of the modeling process. The authors introduce new approaches to estimate and visualize uncertainty, assign weights to model components, and test the model outcomes retrospectively. They also present the final results in terms of the probability to exceed a certain ground acceleration level in a given time frame to facilitate interpretation for a wide range of stakeholders.
ANNALS OF GEOPHYSICS
(2021)
Article
Geochemistry & Geophysics
Stefania Corvo, Matteo Maino, Antonio Langone, Filippo Luca Schenker, Sandra Piazolo, Leonardo Casini, Silvio Seno
Summary: The study focuses on the geological samples from the Cima di Gagnone area in the Central Alps, revealing heterogeneous metamorphic conditions in rocks of different composition and rheology. The research results show that the metasediments generally experienced medium pressure and medium temperature conditions, but samples near ultramafic lenses recorded significantly higher conditions. Additionally, the study also identifies local melt/fluid interaction, as well as deformation-driven pressure and temperature variations within the rocks.
Article
Geosciences, Multidisciplinary
Xin Zhong, Arianne J. Petley-Ragan, Sarah H. M. Incel, Marcin Dabrowski, Niels H. Andersen, Bjorn Jamtveit
Summary: This study reports direct measurements of highly overpressurized frictional melts along a seismic fault surface in the Bergen Arcs, Western Norway. The results suggest that the melt pressure may have been generated when melt pressure approached the maximum principal stress in a system subject to high differential stress, and provide insight into the strong lower crust that accommodated up to 1 GPa differential stress during the compressive stage of the Caledonian orogeny.
Article
Geosciences, Multidisciplinary
Franziska Mayrhofer, Martin P. J. Schoepfer, Marta Adamuszek, Marcin Dabrowski, Bernhard Grasemann
Summary: This article describes the geometry and development of transtensional flanking structures in the glacial ice of Austria's Pasterze. It reveals the characteristics of a- and s-type flanking folds in the glacier ice, and successfully reproduces their geometries using a modified Eshelby solution.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Geochemistry & Geophysics
S. Corvo, M. Maino, S. Piazolo, S. Seno, A. Langone
Summary: The formation of shear zones is crucial for understanding crustal deformation and the evolution of rifted margins. However, there is often a lack of detailed characterization of the compositional and structural patterns of shear zones, leading to poorly constrained models of shear initiation. This study focuses on the Anzola shear zone and reveals the significant pre-existing heterogeneities related to the composition and deformation structures, suggesting that these heterogeneities are preferential loci for strain localization controlling the initiation and development of rift-related structures in the mid to lower crust of passive margins.
Article
Chemistry, Analytical
Daniele Strigaro, Massimiliano Cannata, Fabio Lepori, Camilla Capelli, Andrea Lami, Dario Manca, Silvio Seno
Summary: In certain sectors of water resources management, the progress of the digital revolution is hindered by factors such as costs, lack of digital expertise, and resistance to change. This project aims to examine the feasibility of using an open, cost-effective, and replicable digital ecosystem for lake monitoring to address the issue of incomplete integration of information. By utilizing cloud-based technology and an Automatic High-Frequency Monitoring System (AHFM) built with open hardware and software components, the system will be tested and validated in a real-life scenario, integrating historical databases and evaluating the performance of the AHFM system.
Article
Geosciences, Multidisciplinary
Niccolo Menegoni, Matteo Maino, Giovanni Toscani, Lucia Isabella Mordeglia, Gianfranco Valle, Cesare Perotti
Summary: The investigation of deformations in Quaternary deposits is crucial in understanding recent geological history and natural hazards in densely populated areas. In this study, the researchers used digital photogrammetry and digital outcrop modelling to obtain a permanent digital representation of a trench in Castelletto Ticino. The study identified Holocene deformational structures and constrained their age using radiocarbon and archaeological dating, suggesting recent tectonic activity related to buried thrust faults.
Article
Geochemistry & Geophysics
Marta Adamuszek, Dan M. Tamas, Jessica Barabasch, Janos L. Urai
Summary: The study shows that impurities and layer thickness variations can significantly affect fold development in rock salt. Dark layers containing more impurities exhibit higher viscosities and influence the fold morphology. Furthermore, fold development is also influenced by the magnitude of deviatoric stress and impurity content.
Article
Geochemistry & Geophysics
Xin Zhong, Marcin Dabrowski, Bjorn Jamtveit
Summary: Raman elastic thermobarometry has been widely used to determine the P-T conditions of mineral inclusion entrapment in petrological studies. This study introduces an analytical framework based on the Eshelby solution to calculate the residual stress and strain state of ellipsoidal inclusions in an isotropic host, showing that the effect of changing the aspect ratio varies for different mineral inclusions. Results indicate that quartz is the least affected by aspect ratio changes, while rutile is the most affected. Furthermore, the study demonstrates the possibility of fitting an effective ellipsoid to estimate the averaged residual stress or strain within faceted inclusions, expanding the applicability of the analytical solution in practical Raman measurements.
