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Journal articles on the topic 'Deformations of D-Structures'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Hassan, S. F. "O(d,d;R) deformations of complex structures and extended worldsheet supersymmetry." Nuclear Physics B 454, no. 1-2 (1995): 86–102. http://dx.doi.org/10.1016/0550-3213(95)00384-5.

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Cingolani, Matteo, Gioia Fusaro, Giulia Fratoni, and Massimo Garai. "Influence of thermal deformations on sound absorption of three-dimensional printed metamaterials." Journal of the Acoustical Society of America 151, no. 6 (2022): 3770–79. http://dx.doi.org/10.1121/10.0011552.

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Acoustic metamaterials (AMMs) are designed with complex geometrical shapes to obtain unconventional sound-absorbing performances. As additive manufacturing is particularly suited to print complex structures in a more straightforward and controllable way, AMMs often exploit three-dimensional (3-D) printing techniques. However, when exposed to different temperature conditions, such structures can be affected by geometrical deformations, especially when they are polymer-based. This can cause a mismatch between the experimental data and the expected theoretical performance; therefore, it is import

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3

AKTAY, Şirin. "D-Homothetic Deformations and Almost Paracontact Metric Manifolds." Fundamentals of Contemporary Mathematical Sciences 5, no. 1 (2023): 1–14. http://dx.doi.org/10.54974/fcmathsci.1240849.

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In this study, we determine some of the classes of almost paracontact metric structures which are invariant under D-homothetic deformations. We write the Riemannian curvature tensor, the Ricci tensor and the scalar curvature when the characteristic vector field is Killing. In addition, we give examples.

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4

KAPUSTIN, ANTON. "TOPOLOGICAL STRINGS ON NONCOMMUTATIVE MANIFOLDS." International Journal of Geometric Methods in Modern Physics 01, no. 01n02 (2004): 49–81. http://dx.doi.org/10.1142/s0219887804000034.

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We identify a deformation of the N=2 supersymmetric sigma model on a Calabi–Yau manifold X which has the same effect on B-branes as a noncommutative deformation of X. We show that for hyperkähler X such deformations allow one to interpolate continuously between the A-model and the B-model. For generic values of the noncommutativity and the B-field, properties of the topologically twisted sigma-models can be described in terms of generalized complex structures introduced by N. Hitchin. For example, we show that the path integral for the deformed sigma-model is localized on generalized holomorph

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5

Eriksen, Eivind. "Computing Noncommutative Deformations of Presheaves and Sheaves of Modules." Canadian Journal of Mathematics 62, no. 3 (2010): 520–42. http://dx.doi.org/10.4153/cjm-2010-015-6.

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AbstractWe describe a noncommutative deformation theory for presheaves and sheaves of modules that generalizes the commutative deformation theory of these global algebraic structures and the noncommutative deformation theory of modules over algebras due to Laudal.In the first part of the paper, we describe a noncommutative deformation functor for presheaves of modules on a small category and an obstruction theory for this functor in terms of global Hochschild cohomology. An important feature of this obstruction theory is that it can be computed in concrete terms in many interesting cases.In th

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Correa, Francisco, and Olaf Lechtenfeld. "Algebraic integrability of PT -deformed Calogero models." Journal of Physics: Conference Series 2038, no. 1 (2021): 012007. http://dx.doi.org/10.1088/1742-6596/2038/1/012007.

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Abstract We review some recents developments of the algebraic structures and spectral properties of non-Hermitian deformations of Calogero models. The behavior of such extensions is illustrated by the A 2 trigonometric and the D 3 angular Calogero models. Features like intertwining operators and conserved charges are discussed in terms of Dunkl operators. Hidden symmetries coming from the so-called algebraic integrability for integral values of the coupling are addressed together with a physical regularization of their action on the states by virtue of a PT -symmetry deformation.

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7

Yuge, K., N. Iwai, and N. Kikuchi. "Optimization of 2-D structures subjected to nonlinear deformations using the homogenization method." Structural Optimization 17, no. 4 (1999): 286–99. http://dx.doi.org/10.1007/bf01207005.

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8

He, Kuan, Youfeng Zou, Zhigang Han, and Jilei Huang. "Time-Series InSAR Technology for Monitoring and Analyzing Surface Deformations in Mining Areas Affected by Fault Disturbances." Remote Sensing 16, no. 24 (2024): 4811. https://doi.org/10.3390/rs16244811.

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Faults, as unique geological structures, disrupt the mechanical connections between rock masses. During coal mining, faults in the overlying strata can disturb the original stress balance, leading to fault activation and altering the typical subsidence patterns. This can result in abnormal ground deformation and significant damage to surface structures, posing a serious geological hazard in mining areas. This study examines the influence of a known fault (F13 fault) on ground subsidence in the Wannian Mine of the Fengfeng Mining Area. We utilized 12 Sentinel-1A images and applied SBAS-InSAR, S

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9

Shaw, Amit, and D. Roy. "Improved Procedures for Static and Dynamic Analyses of Wrinkled Membranes." Journal of Applied Mechanics 74, no. 3 (2006): 590–94. http://dx.doi.org/10.1115/1.2338057.

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An analysis of large deformations of flexible membrane structures within the tension field theory is considered. A modification of the finite element procedure by Roddeman et al. (Roddeman, D. G., Drukker, J., Oomens, C. W. J., Janssen, J. D., 1987, ASME J. Appl. Mech. 54, pp. 884–892) is proposed to study the wrinkling behavior of a membrane element. The state of stress in the element is determined through a modified deformation gradient corresponding to a fictive nonwrinkled surface. The new model uses a continuously modified deformation gradient to capture the location orientation of wrinkl

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Vilfayeau, Jerome, David Crépin, François Boussu, Damien Soulat, and Philippe Boisse. "Numerical Modelling of the Weaving Process for Textile Composite." Key Engineering Materials 554-557 (June 2013): 472–77. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.472.

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Due to advancements made in 3D weaving process [1] and, in order to develop 3D textile structure as reinforcement of composite material for aeronautic application, a good prediction of the geometry and the mechanical properties of the 3D woven unit cell is required. Due to the complexity of these textile architectures, realistic geometric representations [2] of fabrics are often difficult to obtain especially for 3D woven fabrics, but these descriptions are necessary to define meshes for finite element computation [3]. At present, existing tools which model and define, early at a mesoscopic sc

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HUDAK, Vasyl, Tetiana KRIL, and Vitaliy ZATSERKOVNYI. "REMOTE SENSING ANALYSIS OF VERTICAL SURFACE DISPLACEMENTS AS AN INDICATOR OF UNDERGROUND STRUCTURE DEFORMATIONS." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 1 (108) (2025): 94–102. https://doi.org/10.17721/1728-2713.108.13.

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Background. The paper is devoted to the analysis of vertical displacements based on remote sensing data as an identifier of hazardous engineering-geological processes in areas with underground infrastructure. The study was carried out on the example of the section of the tunnel between Demiivska and Lybidska stations of the Kyiv subway. In December 2023, processes of uneven compaction and vibration creep of the soil massif around the tunnel lining were detected, and there was a risk of loss of stability of the tunnel structures and an emergency. Methods. This study employs the Differential Int

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12

Makarenko, V., V. Gots, O. Berdnyk, N. Amelina, and I. Yasenova. "The influence of hydrogen on the resistance to the formation of cracks in welded joints of water supply pipelines." Ways to Improve Construction Efficiency 1, no. 52 (2023): 82–89. https://doi.org/10.32347/2707-501x.2023.52(1).82-89.

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The existing scientific and practical studies of the influence of hydrogen on the parameters of crack resistance are characterized by uncertainty and contradiction, the lack of clear ideas about the mechanism of the initiation and propagation of cold cracks, and therefore there are no balanced approaches to combating the formation of cracks during the long-term operation of pipelines, and therefore additional studies are needed. It was established that with an increase in the content of diffusible hydrogen in the deposited metal, the resistance to its brittle destruction decreases sharply. Thu

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13

Marinkovic, Dragan, Manfred Zehn, and Predrag Milic. "On the design of thermally loaded fiber optics feedthroughs." Thermal Science 20, suppl. 5 (2016): 1313–20. http://dx.doi.org/10.2298/tsci16s5313m.

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Thermo-mechanical design aspects of various structures exposed to cyclic thermal loading have a crucial impact on their lifetime. This is particularly valid for fiber optics feedthroughs that involve several materials with significantly different thermal expansion ratios. Thermal loading in such structures may give rise to non-trivial thermally induced deformations and therewith stresses, which can be adequately predicted and assessed only by a detailed 3-D numerical simulation. This paper considers a couple of design solutions of fiber optics feedthroughs, which have exhibited certain weaknes

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14

Pakhomova, E. G., O. I. Kutsenko, A. S. Morozova, and A. R. Timokhina. "Settlement Computation of Homogeneous Base." Proceedings of the Southwest State University 23, no. 6 (2020): 90–98. http://dx.doi.org/10.21869/2223-1560-2019-23-6-90-98.

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Purpose of reseach. This article proposes the development of a new methodology for determining the settlement of a homogeneous foundation base on the basis of the layer-by-layer summation method, which reduces the amount of calculations performed.Methods. The boundary of the compressible stratum can be determined graphically from the condition that the additional stresses are equal to half the natural stresses. Knowing the value of the depth of the compressible stratum, we can determine the total value of the coefficients included in the well-known formula for calculating the settlement of the

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15

Gigli, G., F. Mugnai, L. Leoni, and N. Casagli. "<i>Brief communication</i> "Analysis of deformations in historic urban areas using terrestrial laser scanning"." Natural Hazards and Earth System Sciences 9, no. 6 (2009): 1759–61. http://dx.doi.org/10.5194/nhess-9-1759-2009.

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Abstract. The terrestrial laser scanning (TLS) technique has been used to accurately reconstruct the 3-D shape of the walls and bastions of the historic city of Mdina (Malta) and underlying terrain. By applying this technique it has also been possible to extract additional quantitative information regarding weathering and deformational processes affecting the structures. Thus, with the aim of identifying the main instability mechanisms, a detailed 3-D crack distribution map has been drawn and the main displacement vectors have been defined.

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Romashko, Vasyl Mykolayovych, and Olena Vasylivna Romashko-Maistruk. "MAIN PARAMETERS OF THE UNIVERSAL CONCRETE STATE DIAGRAM IN THE REINFORCED CONCRETE ELEMENTS AND STRUCTURES." Collected scientific works of Ukrainian State University of Railway Transport, no. 199 (June 10, 2022): 44–54. http://dx.doi.org/10.18664/1994-7852.199.2022.258672.

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This article presents the research results on the search and methodologicaljustification of the main parametric points of the universal dependence of the concrete deformationdiagram c c in reinforced concrete elements and structures. It is shown that, unlike others, thisdependence is not empirical, but obtained analytically using the hypothesis of "stiffness nonlinearity".The using expediency this hypothesis to describe the concrete stress-strain state in reinforcedconcrete elements and structures is substantiated by the results of experimental studies by otherauthors.The most important dif

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17

Rio Hanzra Adjie Pamungkas and Edy Sutriyono. "Recognizing Synrift and Postrift Structures on Rock Exposures in The Tanjung Aur II Region, South Bengkulu, Indonesia." Journal of Geoscience, Engineering, Environment, and Technology 9, no. 04 (2024): 444–52. https://doi.org/10.25299/jgeet.2024.9.04.14528.

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Field observation has been carried out recently in the Tanjung Aur II region, South Bengkulu in order to recognize the structural configuration of rock sequences, employing two fundamental approaches such as the analysis of Digital Elevation Model (DEM) and the surface mapping, particularly on geological structures. The DEM analysis reveals two general patterns of the NE-SW and NW-SE lineaments. The NE-SW trend appears consistent with the structural features resulted from the WNW-directed rifting event, whereas the NW-SE orientation seems coincident with the general strike of the Bengkulu Basi

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18

Liang, Lexian, and Hailong Pei. "Affine Iterative Closest Point Algorithm Based on Color Information and Correntropy for Precise Point Set Registration." Sensors 23, no. 14 (2023): 6475. http://dx.doi.org/10.3390/s23146475.

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In this paper, we propose a novel affine iterative closest point algorithm based on color information and correntropy, which can effectively deal with the registration problems with a large number of noise and outliers and small deformations in RGB-D datasets. Firstly, to alleviate the problem of low registration accuracy for data with weak geometric structures, we consider introducing color features into traditional affine algorithms to establish more accurate and reliable correspondences. Secondly, we introduce the correntropy measurement to overcome the influence of a large amount of noise

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19

McGreevy, Ryan, Abhishek Singharoy, Qufei Li, et al. "xMDFF: molecular dynamics flexible fitting of low-resolution X-ray structures." Acta Crystallographica Section D Biological Crystallography 70, no. 9 (2014): 2344–55. http://dx.doi.org/10.1107/s1399004714013856.

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X-ray crystallography remains the most dominant method for solving atomic structures. However, for relatively large systems, the availability of only medium-to-low-resolution diffraction data often limits the determination of all-atom details. A new molecular dynamics flexible fitting (MDFF)-based approach, xMDFF, for determining structures from such low-resolution crystallographic data is reported. xMDFF employs a real-space refinement scheme that flexibly fits atomic models into an iteratively updating electron-density map. It addresses significant large-scale deformations of the initial mod

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20

Lints, Martin, and Madis Ratassepp. "Accuracy of the Mindlin Model in A0 Lamb Mode Scattering from Partial Through-Thickness Damage." Applied Sciences 14, no. 20 (2024): 9351. http://dx.doi.org/10.3390/app14209351.

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Guided wave tomography is an effective non-destructive method for mapping corrosion damage in thin-walled metal structures. Its efficiency and accuracy depend on the choice of a suitable forward model and inversion method. Current techniques mainly use acoustic forward models that, while computationally efficient, are approximate and fail to accurately represent wave propagation in physical experiments, making them less suitable for inversion. This study investigates the performance of Mindlin plate theory, which accounts for through-thickness shear deformations, enabling the modeling of flexu

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21

Cotti, Giordano, and Davide Guzzetti. "Results on the extension of isomonodromy deformations to the case of a resonant irregular singularity." Random Matrices: Theory and Applications 07, no. 04 (2018): 1840003. http://dx.doi.org/10.1142/s2010326318400038.

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We explain some results of [G. Cotti, B. A. Dubrovin and D. Guzzetti, Isomonodromy deformations at an irregular singularity with coalescing eigenvalues, preprint (2017); arXiv:1706.04808 .], discussed in our talk [G. Cotti, Monodromy of semisimple Frobenius coalescent structures, in Int. Workshop Asymptotic and Computational Aspects of Complex Differential Equations, CRM, Pisa, February 13–17, (2017).] in Pisa, February 2017. Consider an [Formula: see text] linear system of ODEs with an irregular singularity of Poincaré rank 1 at [Formula: see text] and Fuchsian singularity at [Formula: see te

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22

Pelham, Robert J., and Yu-li Wang. "High Resolution Detection of Mechanical Forces Exerted by Locomoting Fibroblasts on the Substrate." Molecular Biology of the Cell 10, no. 4 (1999): 935–45. http://dx.doi.org/10.1091/mbc.10.4.935.

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We have developed a new approach to detect mechanical forces exerted by locomoting fibroblasts on the substrate. Cells were cultured on elastic, collagen-coated polyacrylamide sheets embedded with 0.2-μm fluorescent beads. Forces exerted by the cell cause deformation of the substrate and displacement of the beads. By recording the position of beads during cell locomotion and after cell removal, we discovered that most forces were radially distributed, switching direction in the anterior region. Deformations near the leading edge were strong, transient, and variable in magnitude, consistent wit

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23

KIM, SEUNG ROK, and JEONG SEO KOO. "A STUDY ON STRAIN RATE EFFECT IN COLLISION ANALYSIS OF ROLLING STOCK." International Journal of Modern Physics B 22, no. 09n11 (2008): 1423–30. http://dx.doi.org/10.1142/s0217979208046876.

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In this paper, the strain rate effect of energy absorption members in rolling stock is studied using the virtual testing model (VTM) for Korean high speed train (KHST). The VTM of KHST was simulated for two different strain rate conditions. The VTM is composed of FE models for structures, and nonlinear spring/damper models for dynamic components. To simplify numerical model for the full rake KHST, the first three units consist of full flexible multi-body dynamic models, and the remainder does 1-D spring/damper/mass models. To evaluate the strain rate effect of KHST, the crash simulation was pe

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Wang, SF, JH Zhang, ZG Liu, et al. "Riveting parameter design that satisfies requirements for driven rivet head dimensions." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 13 (2014): 2412–32. http://dx.doi.org/10.1177/0954406214559256.

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Riveted joints are extensively adopted in designing aircraft structures. Riveting implies a squeezing process of the rivet with large plastic deformations to form the driven rivet head. The driven rivet head dimensions (height H, diameter D) depend on riveting force ( X1), rivet length and diameter tolerance ( X2 and X3), as well as rivet hole tolerance ( X4). Incorrect selection in these parameters could induce the excessive stress concentration that results in initial crack and also results in improper rivet head deformation leading to loose rivet. The present research is conducted on a MS20

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25

Moradi, Mohamadali, Ali Khezri, Seyed Majdeddin Mir Mohammad Hosseini, Hongbae Park, and Daeyong Lee. "Experimental Investigation of Embedment Depth Effects on the Rocking Behavior of Foundations." Geosciences 14, no. 12 (2024): 351. https://doi.org/10.3390/geosciences14120351.

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Shallow foundations supporting high-rise structures are often subjected to extreme lateral loading from wind and seismic activities. Nonlinear soil–foundation system behaviors, such as foundation uplift or bearing capacity mobilization (i.e., rocking behavior), can act as energy dissipation mechanisms, potentially reducing structural demands. However, such merits may be achieved at the expense of large residual deformations and settlements, which are influenced by various factors. One key factor which is highly influential on soil deformation mechanisms during rocking is the foundation embedme

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26

Jiang, Ke He, Bei Bei Sun, and Xiao Bo Kang. "Simulations of Thermal Behaviors on a Power-Driven Turret." Advanced Materials Research 139-141 (October 2010): 961–64. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.961.

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As core functional components of the medium and high grade CNC machine tools, the power-driven turret involves high technology and complicated structures. Traditionally, in the study of low speed turrets` performances, the effects of thermal influences are often negligible. However, on the high speed conditions, thermal effect cannot be neglected. This paper establishes the high speed turret 3-D Model and the Finite Element Model (FEM), and investigates and analyzes temperature fields and thermal deformations. Experimental measurements are implemented on the surfaces of the original model turr

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27

Polcanov, Vladimir, Alina Polcanova, Alexandru Cirlan, and Alexandru Rascovoi. "APPLICATION OF NEW TECHNOLOGIES TO ENHANCE THE STABILITY OF HIGH EMBANKMENT SLOPES." JOURNAL OF ENGINEERING SCIENCE 31, no. 2 (2024): 60–69. http://dx.doi.org/10.52326/jes.utm.2024.31(2).06.

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This study aims to investigate the stability problems of high road embankment slopes in the Republic of Moldova, revealing shortcomings of classical methods. The authors propose a solution by using the RG system, equipped with specialized vibration drilling equipment from "RTG RAMMTECHNIC Gmbh". The method provides for the creation of piles in deep boreholes using the vibrating d, filling the cavities with soil, with subsequent compaction of soil in stages. Experimental field and laboratory research has demonstrated the effectiveness of this method. The results showed significant improvements

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Polcanov, Vladimir, Alina Polcanova, Alexandru Cirlan, and Alexandru Rascovoi. "Application of new technologies to enhance the stability of high embankment slopes." Journal of Engineering Science 31, no. 2 (2024): 60–69. https://doi.org/10.52326/jes.utm.2024.31(2).06.

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  This study aims to investigate the stability problems of high road embankment slopes in the Republic of Moldova, revealing shortcomings of classical methods. The authors propose a solution by using the RG system, equipped with specialized vibration drilling equipment from "RTG RAMMTECHNIC Gmbh". The method provides for the creation of piles in deep boreholes using the vibrating d, filling the cavities with soil, with subsequent compaction of soil in stages. Experimental field and laboratory research has demonstrated the effectiveness of this method. The results showed significant improv

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ZHORNIK, Viktor I., and Svetlana A. KOVALIOVA. "ENERGY STATE ESTIMATION OF MECHANOCOMPOSITES CONTAINING FUSIBLE COMPONENTS BASED ON ANALYSIS OF FINE STRUCTURE PARAMETERS AND THERMAL EFFECTS." Mechanics of Machines, Mechanisms and Materials 4, no. 53 (2020): 77–84. http://dx.doi.org/10.46864/1995-0470-2020-4-53-77-84.

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Energy state of composites obtained by mechanical alloying of the Cu-Sn and Fe-Ga powder mixtures during high-energy processing in the planetary ball mill is evaluated by the methods of X-ray diffraction analysis (XRD) and differential scanning calorimetry (DSC). It is shown that during mechanical alloying the total amount of accumulated energy can reach 80 % of the composite melting enthalpy. The greatest contribution to the structuralphase transformations is made by the phase changes of elastic deformations and grain boundaries. The obtained XRD data are consistent with the DSC data. Three e

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Ikeda, Kazutaka, Yuko Nakamori, and Shinichi Orimo. "Hydriding Properties of the Mechanically Deformed Mg-Ni Alloys." Materials Science Forum 503-504 (January 2006): 499–504. http://dx.doi.org/10.4028/www.scientific.net/msf.503-504.499.

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Mechanical deformations with/without elemental substitutions have been carried out on Mg-Ni-based alloys to improve their hydriding properties. The alloys Mg-x at.%Ni (x = 33, 38, 43 and 50) with different nanometer-scale structures were successively synthesized by mechanical milling of Mg2Ni mixed with various amounts of additional Ni, and the relations between their structural and hydriding properties were investigated in detail. By milling only Mg2Ni, nanostructured Mg2Ni composed of the intra- and inter-grain regions was obtained (x = 33). Amorphous MgNi (a-MgNi) as a third region was disp

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Shumanov, I., S. Tabachnikov, T. Nalivayko, E. Dorozhko, and T. Nalyvayko. "INNOVATIVE METHODS OF PLANNING AND RECONSTRUCTION OF HISTORICAL HERITAGE BUILDINGS USING A 3D SCANNER." Municipal economy of cities 4, no. 178 (2023): 65–71. http://dx.doi.org/10.33042/2522-1809-2023-4-178-65-71.

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During the war, many houses were completely or partially destroyed. Damaged residential buildings, historical buildings are of particular importance as monuments of architecture and art and cannot be restored. Thanks to the bombing, a whole historical era was lost. For restoration and rebuilding or reconstruction, qualitative analysis and assessment of the degree of destruction are required. There are many well-known methods of assessing the destruction and damage of buildings, which were used by architects and urban planners. The following types of technical inspection of the condition of bui

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Pöchtrager, M., G. Styhler-Aydın, M. Döring-Williams, and N. Pfeifer. "AUTOMATED RECONSTRUCTION OF HISTORIC ROOF STRUCTURES FROM POINT CLOUDS – DEVELOPMENT AND EXAMPLES." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-2/W2 (August 16, 2017): 195–202. http://dx.doi.org/10.5194/isprs-annals-iv-2-w2-195-2017.

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The analysis of historic roof constructions is an important task for planning the adaptive reuse of buildings or for maintenance and restoration issues. Current approaches to modeling roof constructions consist of several consecutive operations that need to be done manually or using semi-automatic routines. To increase efficiency and allow the focus to be on analysis rather than on data processing, a set of methods was developed for the fully automated analysis of the roof constructions, including integration of architectural and structural modeling. Terrestrial laser scanning permits high-det

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Qian-Yuan, Tang, and Kaneko Kunihiko. "Dynamics-evolution correspondence in protein structures." Physical Review Letters 127 (July 15, 2021): 098103. https://doi.org/10.5281/zenodo.5105202.

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<strong>Abstract:</strong> The genotype-phenotype mapping of proteins is a fundamental question in structural biology. In this Letter, with the analysis of a large dataset of proteins from hundreds of protein families, we quantitatively demonstrate the correlations between the noise-induced protein dynamics and mutation-induced variations of native structures, indicating the dynamics-evolution correspondence of proteins. Based on the investigations of the linear responses of native proteins, the origin of such a correspondence is elucidated. It is essential that the noise/mutation-induced defo

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34

Gutierrez-Sagredo, Ivan, and Francisco Jose Herranz. "Cayley–Klein Lie Bialgebras: Noncommutative Spaces, Drinfel’d Doubles and Kinematical Applications." Symmetry 13, no. 7 (2021): 1249. http://dx.doi.org/10.3390/sym13071249.

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The Cayley–Klein (CK) formalism is applied to the real algebra so(5) by making use of four graded contraction parameters describing, in a unified setting, 81 Lie algebras, which cover the (anti-)de Sitter, Poincaré, Newtonian and Carrollian algebras. Starting with the Drinfel’d–Jimbo real Lie bialgebra for so(5) together with its Drinfel’d double structure, we obtain the corresponding CK bialgebra and the CK r-matrix coming from a Drinfel’d double. As a novelty, we construct the (first-order) noncommutative CK spaces of points, lines, 2-planes and 3-hyperplanes, studying their structural prope

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Vykhovanetz, G. V., and L. V. Organ. "THE INFLUENCE OF THE ANTHROPOGENIC FACTOR ON THE BLACK SEA COAST WITHIN THE ODESSA REGION." Odesa National University Herald. Geography and Geology 28, no. 1(42) (2023): 11–25. http://dx.doi.org/10.18524/2303-9914.2023.1(42).282231.

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Problem Statement & Purpose. The city of Odessa is the center of a large industrial and port agglomeration on the northwestern coast of the Black Sea between Cape Karabush and Sanzheyskiy Cape. Until the foundation of the seaport and the city, the Black Sea shores and estuaries almost always existed in a natural state, except for local small areas located in temporary fishing, military, wandering sites. But from the end of the 18th century, the first buildings and transformations of natural slopes began, which began to significantly change the surrounding nature of the coast and coastal la

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Louadj, Samia, Ramdane Bahar, and Nasser Laouami. "Numerical Analysis of Keddara Dam under Seismic Motion." International Journal of Engineering Research in Africa 40 (December 2018): 47–62. http://dx.doi.org/10.4028/www.scientific.net/jera.40.47.

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The Boumerdes earthquake of May 21, 2003 in Algeria, which widely felt within a radius of ~ 400 km, caused damage in five provinces. Numerous structures have been devastated, others suffered of damages. Keddara rockfill dam which is situated approximately at 20 km from the epicentre was strongly shaken during this seismic event and can undergo significant deformations. In this study, numerical analysis of Keddara rockfill dam under Boumerdes earthquake is performed. It is mainly focus on the seismic amplification at different level of the dam under the main shock with dominant frequency close

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Cheong, Yuen-Ki, Mariana P. Arce, Alejandro Benito, et al. "Synergistic Antifungal Study of PEGylated Graphene Oxides and Copper Nanoparticles against Candida albicans." Nanomaterials 10, no. 5 (2020): 819. http://dx.doi.org/10.3390/nano10050819.

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The coupling reactions of polyethylene glycol (PEG) with two different nano-carbonaceous materials, graphene oxide (GO) and expanded graphene oxide (EGO), were achieved by amide bond formations. These reactions yielded PEGylated graphene oxides, GO-PEG and EGO-PEG. Whilst presence of the newly formed amide links (NH-CO) were confirmed by FTIR stretches observed at 1732 cm−1 and 1712 cm−1, the associated Raman D- and G-bands resonated at 1311/1318 cm−1 and 1584/1595 cm−1 had shown the carbonaceous structures in both PEGylated products remain unchanged. Whilst SEM images revealed the nano-sheet

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Nemat-Nasser, Sia, Jeom Yong Choi, Jon B. Isaacs, and David W. Lischer. "Quasi-Static and Dynamic Buckling of Thin Cylindrical Shape-Memory Shells." Journal of Applied Mechanics 73, no. 5 (2005): 825–33. http://dx.doi.org/10.1115/1.2165241.

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To investigate the buckling behavior of thin and relatively thick cylindrical shape-memory shells, uniaxial compression tests are performed at a 295K initial temperature, using the CEAM/UCSD’s modified split Hopkinson bar systems and an Instron hydraulic testing machine. The quasi-static buckling response of the shells is directly observed and recorded using a digital camera with a close-up lens and two back mirrors. To document the dynamic buckling modes, a high-speed Imacon 200 framing camera is used. The shape-memory shells with an austenite-finish temperature of Af=281K, buckle gradually a

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Marahatta, Anant Babu. "Gaussian-External Methodology Predicted Crystal Structures, Molecular Energetics, and Potential Energy Surface of the Crystalline Molecular Compass." Asian Journal of Applied Chemistry Research 14, no. 1 (2023): 8–25. http://dx.doi.org/10.9734/ajacr/2023/v14i1255.

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Nanoscience, Nanotechnology, and Molecular machines have triggered the scientists of wide-ranging disciplines alike for decades now, offered the most innovative technologies to maneuver the nanoscale devices molecule by molecule. In this arena of the nano-metric world, the strategical laboratorial syntheses & computational designations of the prototype molecules/nanomaterials and the most probable techniques for their effective functionalization always stand as mandatory credentials. Among various types of functionalizing nanomaterials, the topologically closed Si and -(Si-O)x- based dipol

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Narmashiri, Kambiz, Mohd Zamin Jumaat, and Nor Hafizah Ramli Sulong. "Failure Modes of CFRP Flexural Strengthened Steel I-Beams." Key Engineering Materials 471-472 (February 2011): 590–95. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.590.

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This paper presents the experimental and numerical studies on the flexural strengthened steel I-beams by using Carbon Fiber Reinforced Polymer (CFRP) strips. Nowadays, strengthening existing steel structures by using CFRP has been widely interested. One of the common usages of CFRP to strengthen steel beams is the flexural upgrading. In this case, CFRP strips are pasted on the tensile flange to improve flexural behaviors. The problems that are frequently reported for CFRP strengthened steel beams are the debonding, delaminating (peeling), and splitting. Identification these failure modes are e

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Böhm, Stanislav, and Otto Exner. "Geometry at the aliphatic tertiary carbon atom: computational and experimental test of the Walsh rule." Acta Crystallographica Section B Structural Science 60, no. 1 (2004): 103–7. http://dx.doi.org/10.1107/s010876810302826x.

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The geometrical parameters of molecules of 2-substituted 2-methylpropanes and 1-substituted bicyclo[2.2.2]octanes were calculated at the B3LYP/6-311+G(d,p) level. They agreed reasonably well with the mean crystallographic values retrieved from the Cambridge Structural Database for a set of diverse non-cyclic structures with a tertiary C atom. The angle deformations at this C atom produced by the immediately bonded substituent are also closely related to those observed previously in benzene mono derivatives (either as calculated or as derived from crystallographic data). The calculated geometri

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Ashish, Sharma, Bhutani Kapil, and Bhardwaj Arun. "Study the use of Polypropylene Fibers and Steel Fibres in Fibre Reinforced Concrete." Journal of Building Construction 2, no. 3 (2021): 1–7. https://doi.org/10.5281/zenodo.4442362.

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The concrete structures, after 1970 or after that made by use of high strength oriented steel bars with their maximum surface deformations, changed constituents and cement properties and different supplementary materials in cement and admixtures with their capacity of acceleration or deceleration. Now, in place of steel bars, fibers of steel, polypropylene, natural polymers etc. are in use [Anbuvelan, 2014]. The reasons for the demand are many, but as a building engineer, we have to think hard and architecturally using building materials. In anticipation of long-term sustainability, we need to

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Куприянов, И. А., та Н. А. Масленников. "РЕЛАКСАЦИЯ НАПРЯЖЕНИЙ В БЕТОННОМ СТЕРЖНЕ С УЧЕТОМ ВЛИЯНИЯ НА ПОЛЗУЧЕСТЬ ТЕМПЕРАТУРЫ И НЕЛИНЕЙНЫХ ДЛИТЕЛЬНЫХ ДЕФОРМАЦИЙ". ВЕСТНИК ПОВОЛЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНОЛОГИЧЕСКОГО УНИВЕРСИТЕТА. СЕРИЯ: МАТЕРИАЛЫ. КОНСТРУКЦИИ. ТЕХНОЛОГИИ, № 4(28) (21 червня 2024): 15–23. http://dx.doi.org/10.25686/2542-114x.2023.4.15.

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В настоящей статье исследуется процесс релаксации напряжений в бетонном стержне с учетом термоползучести и нелинейности деформаций ползучести. Нелинейная ползучесть выражается через линейную на основе энергетической теории нелинейной ползучести и длительной прочности, разработанной В. Д. Харлабом. Термоползучесть бетона описывается с помощью реологической модели с переменным, зависящим от температуры числом упругих и вязких связей (В. Д. Харлаб, И. А. Куприянов). Для исследования процесса релаксации напряжений рассмотрен бетонный стержень симметричного сечения при возможном изменении температу

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Jolivet, Laurent, Armel Menant, Vincent Roche, et al. "Transfer zones in Mediterranean back-arc regions and tear faults." BSGF - Earth Sciences Bulletin 192 (2021): 11. http://dx.doi.org/10.1051/bsgf/2021006.

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Slab tearing induces localized deformations in the overriding plates of subduction zones and transfer zones accommodating differential retreat in back-arc regions. Because the space available for retreating slabs is limited in the Mediterranean realm, slab tearing during retreat has been a major ingredient of the evolution of this region since the end of the Eocene. The association of detailed seismic tomographic models and extensive field observations makes the Mediterranean an ideal natural laboratory to study these transfer zones. We review in this paper the various structures in back-arc r

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Wilson, Matthew Coffie, Chiri G. Amedjoe, and Simon K. Y. Gawu. "STRUCTURES OF BIRIMIAN AND TARKWAIAN ROCKS AT NORTH-WEST NEW DROBO – IMPLICATION ON DEFORMATION." Malaysian Journal of Geosciences 6, no. 1 (2022): 36–44. http://dx.doi.org/10.26480/mjg.01.2022.36.44.

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This research leads to identifying the microstructures, the deformation episodes (D) and foliation grades (S) of rocks in the study area. Different geological structures such as shear zones, foliations, micro-faults, crack-seal events, etc. have been identified in the study area. Different phases of deformation episodes and foliation grades have been studied to determine the deformation environments. Senses of shear such as dextral, CS, and CS’ as well as antithetic and synthetic micro-faults and boudins may be identified at the north-west New Drobo. Three (3) main deformational (D) events and

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Ligomina, І. P., V. M. Sokolyuk, I. M. Sokulskyi, B. V. Gutyj, and V. B. Dukhnytskyi. "Biochemical, clinical manifestation of vitamin D deficiency in calves." Ukrainian Journal of Veterinary and Agricultural Sciences 6, no. 2 (2023): 68–75. http://dx.doi.org/10.32718/ujvas6-2.11.

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Today, one of the priority tasks in animal husbandry and veterinary medicine is the creation of a highly productive, stable herd with a stable level of metabolism. A large load on the animal's body reveals high milk productivity; in connection with this, metabolic processes slow down, directly reducing milk productivity and requiring a balanced diet and high-quality feed. An increase in milk productivity is often directly related to metabolic disorders and the appearance of diseases, including the intensity of physiological and biochemical metabolic processes associated with converting a signi

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BYTSENKO, A. A. "BRST-INVARIANT DEFORMATIONS OF GEOMETRIC STRUCTURES IN SIGMA MODELS." International Journal of Modern Physics A 26, no. 22 (2011): 3769–80. http://dx.doi.org/10.1142/s0217751x11054231.

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The closed string correlators can be constructed from the open ones using topological string theories as a model. The space of physical closed string states is isomorphic to the Hochschild cohomology of (A,Q) (operator Q of ghost number one), - this statement has been verified by means of computation of the Hochschild cohomology of the category of D -branes. We study a Lie algebra of formal vector fields Wn with its application to the perturbative deformed holomorphic symplectic structure in the A -model, and a Calabi-Yau manifold with boundaries in the B -model. We show that equivalent classe

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BYTSENKO, A. A. "BRST-INVARIANT DEFORMATIONS OF GEOMETRIC STRUCTURES IN SIGMA MODELS." International Journal of Modern Physics: Conference Series 03 (January 2011): 75–86. http://dx.doi.org/10.1142/s2010194511001164.

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The closed string correlators can be constructed from the open ones using topological string theories as a model. The space of physical closed string states is isomorphic to the Hochschild cohomology of (A, Q) (operator Q of ghost number one), - this statement has been verified by means of computation of the Hochschild cohomology of the category of D-branes. We study a Lie algebra of formal vector fields Wn with its application to the perturbative deformed holomorphic symplectic structure in the A-model, and a Calabi-Yau manifold with boundaries in the B-model. We show that equivalent classes

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Negulescu, C., and E. Foerster. "Parametric studies and quantitative assessment of the vulnerability of a RC frame building exposed to differential settlements." Natural Hazards and Earth System Sciences 10, no. 9 (2010): 1781–92. http://dx.doi.org/10.5194/nhess-10-1781-2010.

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Abstract. The aim of this paper is to propose a simplified methodology to evaluate the mechanical performances of buildings exposed to landslide hazard, by using procedures inspired from the seismic risk analysis, such as the Capacity Spectrum Method (ATC 40, 1996). Landslide hazard involves so many aspects, that quantitative vulnerability assessment requires to consider one basic scenario at a time, i.e. one typology for the landslide hazard and one for the structural element considered. In this paper, we propose to assess vulnerability for simple one bay-one storey reinforced concrete (RC) f

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GOLOVIN, A. A., A. A. NEPOMNYASHCHY, and L. M. PISMEN. "NONPOTENTIAL EFFECTS IN NONLINEAR DYNAMICS OF MARANGONI CONVECTION." International Journal of Bifurcation and Chaos 12, no. 11 (2002): 2487–500. http://dx.doi.org/10.1142/s021812740200600x.

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Nonpotential effects in nonlinear evolution of Marangoni convection patterns are investigated analytically and numerically. Three manifestations of nonpotential effects are considered: (i) spatial modulations of hexagonal patterns; (ii) interaction between a short-scale hexagonal pattern and a long-scale slow deformational (Goldstone) mode; (iii) generation of the mean flow by the free-surface deformation in a large-scale Marangoni convection with poorly conducting boundaries. Nonpotential effects are shown to cause various secondary instabilities leading to skewed hexagonal structures, coexis

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