Artykuły w czasopismach: „Topology Tailoring”

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De Leon, D. M., C. E. de Souza, J. S. O. Fonseca, and R. G. A. da Silva. "Aeroelastic tailoring using fiber orientation and topology optimization." Structural and Multidisciplinary Optimization 46, no. 5 (2012): 663–77. http://dx.doi.org/10.1007/s00158-012-0790-8.

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Prasetya, Nicholaus, and Bradley P. Ladewig. "An insight into the effect of azobenzene functionalities studied in UiO-66 frameworks for low energy CO2 capture and CO2/N2 membrane separation." Journal of Materials Chemistry A 7, no. 25 (2019): 15164–72. http://dx.doi.org/10.1039/c9ta02096a.

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Xu, An Ping, Y. S. Liu, H. Wang, Y. Liu, and Y. N. Fu. "Topology Tailoring Method of TWB Autobody Parts Based on HyperWorks." Materials Science Forum 697-698 (September 2011): 631–35. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.631.

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In the paper, a lightweight design method for tailor-welded blanks (TWBs), termed as Topology Tailoring Method (TTM), is proposed, which is based on topology optimization philosophy and in which the variable density method is employed so as to reach the goal of the smallest structure strain energy. By using this method, a TWB autodoor subjected to a specific working condition is topologically optimized in HyperWorks, thus obtaining the more lightweight autodoor. At last, a side impact simulation of the autodoor is demonstrated, thus showing the effectiveness of the method.

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Stainko, R., and O. Sigmund. "Tailoring dispersion properties of photonic crystal waveguides by topology optimization." Waves in Random and Complex Media 17, no. 4 (2007): 477–89. http://dx.doi.org/10.1080/17455030701501851.

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Arredondo-Soto, Mauricio, Enrique Cuan-Urquizo, and Alfonso Gómez-Espinosa. "A Review on Tailoring Stiffness in Compliant Systems, via Removing Material: Cellular Materials and Topology Optimization." Applied Sciences 11, no. 8 (2021): 3538. http://dx.doi.org/10.3390/app11083538.

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Cellular Materials and Topology Optimization use a structured distribution of material to achieve specific mechanical properties. The controlled distribution of material often leads to several advantages including the customization of the resulting mechanical properties; this can be achieved following these two approaches. In this work, a review of these two as approaches used with compliance purposes applied at flexure level is presented. The related literature is assessed with the aim of clarifying how they can be used in tailoring stiffness of flexure elements. Basic concepts needed to understand the fundamental process of each approach are presented. Further, tailoring stiffness is described as an evolutionary process used in compliance applications. Additionally, works that used these approaches to tailor stiffness of flexure elements are described and categorized. Finally, concluding remarks and recommendations to further extend the study of these two approaches in tailoring the stiffness of flexure elements are discussed.

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Lampley, Michael W., Enkhjargal Tsogtgerel, and Eva Harth. "Nanonetwork photogrowth expansion: Tailoring nanoparticle networks’ chemical structure and local topology." Polymer Chemistry 10, no. 28 (2019): 3841–50. http://dx.doi.org/10.1039/c9py00639g.

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Parent nanoparticle networks containing trithiocarbonate photoactive groups form nanonetworks with incorporated homopolymers, random copolymers and block copolymers through a developed photogrowth expansion process.

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Sigmund, Ole. "Topology optimization: a tool for the tailoring of structures and materials." Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 358, no. 1765 (2000): 211–27. http://dx.doi.org/10.1098/rsta.2000.0528.

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Rubio, Wilfredo Montealegre, Glaucio H. Paulino, and Emilio Carlos Nelli Silva. "Tailoring vibration mode shapes using topology optimization and functionally graded material concepts." Smart Materials and Structures 20, no. 2 (2011): 025009. http://dx.doi.org/10.1088/0964-1726/20/2/025009.

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Yang, Yi, Anping Xu, Yunxia Qu, and Yuhong Liu. "Topology tailoring for relaxing thermal-stress concentration in heat resisting heterogeneous material objects." International Journal of Design Engineering 1, no. 2 (2008): 192. http://dx.doi.org/10.1504/ijde.2008.021170.

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Sundararaman, Venkatesh, Matthew P. O’Donnell, Isaac V. Chenchiah, Gearóid Clancy, and Paul M. Weaver. "Stiffness tailoring in sinusoidal lattice structures through passive topology morphing using contact connections." Materials & Design 226 (February 2023): 111649. http://dx.doi.org/10.1016/j.matdes.2023.111649.

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Ergoktas, M. Said, Ali Kecebas, Konstantinos Despotelis, et al. "Localized thermal emission from topological interfaces." Science 384, no. 6700 (2024): 1122–26. http://dx.doi.org/10.1126/science.ado0534.

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The control of thermal radiation by shaping its spatial and spectral emission characteristics plays a key role in many areas of science and engineering. Conventional approaches to tailoring thermal emission using metamaterials are hampered both by the limited spatial resolution of the required subwavelength material structures and by the materials’ strong absorption in the infrared. In this work, we demonstrate an approach based on the concept of topology. By changing a single parameter of a multilayer coating, we were able to control the reflection topology of a surface, with the critical point of zero reflection being topologically protected. The boundaries between subcritical and supercritical spatial domains host topological interface states with near-unity thermal emissivity. These topological concepts enable unconventional manipulation of thermal light for applications in thermal management and thermal camouflage.

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Townsend, Scott, Stephen Grigg, Renato Picelli, Carol Featherston, and Hyunsun Alicia Kim. "Topology optimization of vibrational piezoelectric energy harvesters for structural health monitoring applications." Journal of Intelligent Material Systems and Structures 30, no. 18-19 (2019): 2894–907. http://dx.doi.org/10.1177/1045389x19873392.

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Aircraft structures exhibit localized vibrations over a wide range of frequencies. Such vibrations can be used to power sensors which then monitor the health of the structure. Conventional vibrational piezoelectric harvesting involves optimizing the harvester for one distinct frequency. The aim of this work is to design a wireless vibrational piezoelectric system capable of energy harvesting in the range of 100–500 Hz by tailoring the resonant behavior of cantilever structures. We herein employ a model capable of predicting the performance of a piezoelectric cantilever retrofit on a structural health monitoring sensor and then formulate a design optimization problem and solve with the level set topology optimization method. The designs are verified through fabrication of experimental prototypes.

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Xu, Yangli, Dongyun Zhang, Songtao Hu, et al. "Mechanical properties tailoring of topology optimized and selective laser melting fabricated Ti6Al4V lattice structure." Journal of the Mechanical Behavior of Biomedical Materials 99 (November 2019): 225–39. http://dx.doi.org/10.1016/j.jmbbm.2019.06.021.

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Zhang, Jian, Fred van Keulen, and Alejandro M. Aragón. "On tailoring fracture resistance of brittle structures: A level set interface-enriched topology optimization approach." Computer Methods in Applied Mechanics and Engineering 388 (January 2022): 114189. http://dx.doi.org/10.1016/j.cma.2021.114189.

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Shams, Mahmoud, Zohreh Niazi, Mohammad Reza Saeb, Sina Mozaffari Moghadam, Ali Akbar Mohammadi, and Mehdi Fattahi. "Tailoring the topology of ZIF-67 metal-organic frameworks (MOFs) adsorbents to capture humic acids." Ecotoxicology and Environmental Safety 269 (January 2024): 115854. http://dx.doi.org/10.1016/j.ecoenv.2023.115854.

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Plata-González, Luis Fernando, Ivan Amaya, José Carlos Ortiz-Bayliss, Santiago Enrique Conant-Pablos, Hugo Terashima-Marín, and Carlos A. Coello Coello. "Evolutionary-based tailoring of synthetic instances for the Knapsack problem." Soft Computing 23, no. 23 (2019): 12711–28. http://dx.doi.org/10.1007/s00500-019-03822-w.

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Talantsev, Artem, Amir Elzwawy, Sung Joon Kim, and CheolGi Kim. "Microscopic manipulations of interatomic coupling density for tailoring of exchange bias mediated by mesoscopic interface topology." Applied Surface Science 558 (August 2021): 149861. http://dx.doi.org/10.1016/j.apsusc.2021.149861.

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Seepersad, Carolyn Conner, Janet K. Allen, David L. McDowell, and Farrokh Mistree. "Robust Design of Cellular Materials With Topological and Dimensional Imperfections." Journal of Mechanical Design 128, no. 6 (2006): 1285–97. http://dx.doi.org/10.1115/1.2338575.

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A paradigm shift is underway in which the classical materials selection approach in engineering design is being replaced by the design of material structure and processing paths on a hierarchy of length scales for multifunctional performance requirements. In this paper, the focus is on designing mesoscopic material topology—the spatial arrangement of solid phases and voids on length scales larger than microstructures but smaller than the characteristic dimensions of an overall product. A robust topology design method is presented for designing materials on mesoscopic scales by topologically and parametrically tailoring them to achieve properties that are superior to those of standard or heuristic designs, customized for large-scale applications, and less sensitive to imperfections in the material. Imperfections are observed regularly in cellular material mesostructure and other classes of materials because of the stochastic influence of feasible processing paths. The robust topology design method allows us to consider these imperfections explicitly in a materials design process. As part of the method, guidelines are established for modeling dimensional and topological imperfections, such as tolerances and cracked cell walls, as deviations from intended material structure. Also, as part of the method, robust topology design problems are formulated as compromise Decision Support Problems, and local Taylor-series approximations and strategic experimentation techniques are established for evaluating the impact of dimensional and topological imperfections, respectively, on material properties. Key aspects of the approach are demonstrated by designing ordered, prismatic cellular materials with customized elastic properties that are robust to dimensional tolerances and topological imperfections.

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CHEN, YUHANG, SHIWEI ZHOU, and QING LI. "COMPUTATIONAL DESIGN FOR MULTIFUNCTIONAL MICROSTRUCTURAL COMPOSITES." International Journal of Modern Physics B 23, no. 06n07 (2009): 1345–51. http://dx.doi.org/10.1142/s0217979209060920.

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As an important class of natural and engineered materials, periodic microstructural composites have drawn substantial attention from the material research community for their excellent flexibility in tailoring various desirable physical behaviors. To develop periodic cellular composites for multifunctional applications, this paper presents a unified design framework for combining stiffness and a range of physical properties governed by quasi-harmonic partial differential equations. A multiphase microstructural configuration is sought within a periodic base-cell design domain using topology optimization. To deal with conflicting properties, e.g. conductivity/permeability versus bulk modulus, the optimum is sought in a Pareto sense. Illustrative examples demonstrate the capability of the presented procedure for the design of multiphysical composites and tissue scaffolds.

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Aleksandrova, Mariya, Belgina Ustova, Tsvetozar Tsanev, et al. "Microheater Topology for Advanced Gas Sensor Applications with Carbyne-Enriched Nanomaterials." Applied Sciences 14, no. 5 (2024): 1728. http://dx.doi.org/10.3390/app14051728.

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The response characteristics of carbyne-enriched surface-acoustic-wave (SAW)-based gas sensors utilizing meander and rectangular microheater topologies were investigated to assess their desorption and recovery properties. Comparative analysis of contact resistance and interface capacitance before and after heating revealed minimal deviation in contact resistance, signifying strong thermal stability in the carbyne-enriched layer. However, the interface capacitance varied with the microheater size. Our analysis reveals that a small meander microheater configuration (line width: 300 µm) facilitates efficient sensor recovery at ethanol concentration measurements in the range of 180–680 ppm, maintaining a low deviation in time delay across different concentrations (~2.3%), resulting in a narrow hysteresis and linear sensor response. Conversely, the large meander microheater (line width: 450 µm) and rectangular dense microheater induce irreversible changes in the sensing structure, leading to a widened hysteresis at higher concentrations and increased power consumption. Recovery patterns display substantial deviations from initial values at different concentration levels. Higher concentrations exhibit broader hysteresis, while lower concentrations show narrower hysteresis loops, compared to the small meander microheater. The study offers insights into desorption rates, power consumption variations, and recovery behaviors related to different microheater configurations. It demonstrates the importance of microheater topology selection in tailoring recovery properties and response characteristics, contributing to the advancement of carbyne-based sensor technology.

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Fu, Yu, Li Li, Hongfang Chen, Xuelin Wang, Ling Ling, and Yujin Hu. "Rational design of thermoelastic damping in microresonators with phase-lagging heat conduction law." Applied Mathematics and Mechanics 43, no. 11 (2022): 1675–90. http://dx.doi.org/10.1007/s10483-022-2914-5.

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AbstractThe design of thermoelastic damping (TED) affected by the phase-lagging non-Fourier heat conduction effects becomes significant but challenging for enlarging the quality factor of widely-used microresonators operating in extreme situations, including ultra-high excitation frequency and ultra-low working temperature. However, there does not exist a rational method for designing the TED in the framework of non-Fourier heat conduction law. This work, therefore, proposes a design framework to achieve low thermoelastic dissipation of microresonators governed by the phase-lagging heat conduction law. The equation of motion and the heat conduction equation for phase-lagging TED microresonators are derived first, and then the non-Fourier TED design problem is proposed. A topology optimization-based rational design method is used to resolve the design problem. What is more, a two-dimensional (2D) plain-strain-based finite element method (FEM) is developed as a solver for the topology optimization process. Based on the suggested rational design technique, numerical instances with various phase lags are investigated. The results show that the proposed design method can remarkably reduce the dissipation of microresonators by tailoring their substructures.

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Xia, Qi, Tielin Shi, Shiyuan Liu, and Michael Yu Wang. "Shape and topology optimization for tailoring stress in a local region to enhance performance of piezoresistive sensors." Computers & Structures 114-115 (January 2013): 98–105. http://dx.doi.org/10.1016/j.compstruc.2012.10.020.

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Christodoulopoulos, Kostas, Kostas Katrinis, Marco Ruffini, and Donal O'Mahony. "Tailoring the network to the problem: topology configuration in hybrid electronic packet switched/optical circuit switched interconnects." Concurrency and Computation: Practice and Experience 25, no. 17 (2013): 2412–32. http://dx.doi.org/10.1002/cpe.3096.

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Giraldo Guzman, Daniel, Lalith Sai Srinivas Pillarisetti, Mary Frecker, Cliff J. Lissenden, and Parisa Shokouhi. "Surface wave propagation control with locally resonant metasurfaces using topology-optimized resonators." Journal of the Acoustical Society of America 155, no. 5 (2024): 3172–82. http://dx.doi.org/10.1121/10.0025989.

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Locally resonant elastodynamic metasurfaces for suppressing surface waves have gained popularity in recent years, especially because of their potential in low-frequency applications such as seismic barriers. Their design strategy typically involves tailoring geometrical features of local resonators to attain a desired frequency bandgap through extensive dispersion analyses. In this paper, a systematic design methodology is presented to conceive these local resonators using topology optimization, where frequency bandgaps develop by matching multiple antiresonances with predefined target frequencies. The design approach modifies an individual resonator's response to unidirectional harmonic excitations in the in-plane and out-of-plane directions, mimicking the elliptical motion of surface waves. Once an arrangement of optimized resonators composes a locally resonant metasurface, frequency bandgaps appear around the designed antiresonance frequencies. Numerical investigations analyze three case studies, showing that longitudinal-like and flexural-like antiresonances lead to nonoverlapping bandgaps unless both antiresonance modes are combined to generate a single and wider bandgap. Experimental data demonstrate good agreement with the numerical results, validating the proposed design methodology as an effective tool to realize locally resonant metasurfaces by matching multiple antiresonances such that bandgaps generated as a result of in-plane and out-of-plane surface wave motion combine into wider bandgaps.

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Xia, Qi, Tao Zhou, Michael Yu Wang, and Tielin Shi. "Shape and topology optimization for tailoring the ratio between two flexural eigenfrequencies of atomic force microscopy cantilever probe." Frontiers of Mechanical Engineering 9, no. 1 (2014): 50–57. http://dx.doi.org/10.1007/s11465-014-0286-x.

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Duan, Emily, and Matthew Bryant. "Implications of Spatially Constrained Bipennate Topology on Fluidic Artificial Muscle Bundle Actuation." Actuators 11, no. 3 (2022): 82. http://dx.doi.org/10.3390/act11030082.

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In this paper, we investigate the design of pennate topology fluidic artificial muscle bundles under spatial constraints. Soft fluidic actuators are of great interest to roboticists and engineers, due to their potential for inherent compliance and safe human–robot interaction. McKibben fluidic artificial muscles are an especially attractive type of soft fluidic actuator, due to their high force-to-weight ratio, inherent flexibility, inexpensive construction, and muscle-like force-contraction behavior. The examination of natural muscles has shown that those with pennate fiber topology can achieve higher output force per geometric cross-sectional area. Yet, this is not universally true for fluidic artificial muscle bundles, because the contraction and rotation behavior of individual actuator units (fibers) are both key factors contributing to situations where bipennate muscle topologies are advantageous, as compared to parallel muscle topologies. This paper analytically explores the implications of pennation angle on pennate fluidic artificial muscle bundle performance with spatial bounds. A method for muscle bundle parameterization as a function of desired bundle spatial envelope dimensions has been developed. An analysis of actuation performance metrics for bipennate and parallel topologies shows that bipennate artificial muscle bundles can be designed to amplify the muscle contraction, output force, stiffness, or work output capacity, as compared to a parallel bundle with the same envelope dimensions. In addition to quantifying the performance trade space associated with different pennate topologies, analyzing bundles with different fiber boundary conditions reveals how bipennate fluidic artificial muscle bundles can be designed for extensile motion and negative stiffness behaviors. This study, therefore, enables tailoring the muscle bundle parameters for custom compliant actuation applications.

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Hu, Ping, Hong-Wei Wu, Wen-Jun Sun, et al. "Observation of localized acoustic skyrmions." Applied Physics Letters 122, no. 2 (2023): 022201. http://dx.doi.org/10.1063/5.0131777.

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Recently, acoustic skyrmions have been explored by tailoring velocity vectorial near-field distributions based on the interference of multiple spoof surface acoustic waves, providing new dimensions for advanced sound information processing, transport, and data storage. Here, we theoretically investigate and experimentally demonstrate that a deep-subwavelength spiral metastructure can also generate the acoustic skyrmion configuration. Analyzing the resonant response of the metastructure and observing the spatial profile of the velocity field, we find that the localized skyrmionic modes correspond to eigenmodes of the spiral structure. Thus, the skyrmionic modes do not require carefully tailored external excitation condition and they have multiple resonating frequencies unlike the single skyrmionic mode realized by the interference of multiple waves. We also demonstrate that the topological protected skyrmions supported by the subwavelength metastructure is robust against structure deformations and existence of structure defects. The real-space acoustic skyrmion topology may open new avenues for designing ultra-compact and robust acoustic devices, such as acoustic sensors, acoustic tweezers, and acoustic antennas.

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He, Yuran, Kunyuan Xu, Yiping Wu, Ruihong Zhang, Guangfan Liu, and Jun Li. "Optical angular transparency and broadband absorption based on photonic topological transition in black phosphorus/aluminum oxide hyperbolic metamaterial." AIP Advances 13, no. 1 (2023): 015301. http://dx.doi.org/10.1063/5.0131744.

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Based on the photonic topological transition (PTT), the transmission properties of a black phosphorus/aluminum oxide multilayered hyperbolic metamaterial (HMM) are theoretically investigated in the mid-infrared region. The results demonstrate that an angular transparency window appears near the transition point of PTT, which is achieved by tailoring the topology of the HMM’s equi-frequency surface. The angular full width at half maximum of the transparency window is 2.34°, and the transmittance is higher than 99.8% at normal incidence. In addition, the operating wavelength can be flexibly tuned by adjusting the concentration of electrons. Besides, a layered cascade structure with a wide operating wavelength (1 µm) and an enhanced angular selectivity performance is proposed, which resolves the shortcoming of a single working wavelength. In addition, the spectral-selective behavior of absorption is also explained based on the PTT. These attractive properties make the black phosphorus-based HMM hold promise for potential applications in angularly selective systems and energy harvesting.

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Balbuena, Patricia, David Lesur, M. José González Álvarez, Francisco Mendicuti, Carmen Ortiz Mellet, and José M. García Fernández. "One-pot regioselective synthesis of 2I,3I-O-(o-xylylene)-capped cyclomaltooligosaccharides: tailoring the topology and supramolecular properties of cyclodextrins." Chemical Communications, no. 31 (2007): 3270. http://dx.doi.org/10.1039/b705644c.

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Tereba, Natalia, Tadeusz M. Muzioł, Joanna Wiśniewska, Robert Podgajny, Alina Bieńko, and Grzegorz Wrzeszcz. "Structural Diversity, XAS and Magnetism of Copper(II)-Nickel(II) Heterometallic Complexes Based on the [Ni(NCS)6]4− Unit." Materials 16, no. 2 (2023): 731. http://dx.doi.org/10.3390/ma16020731.

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The new heterometallic compounds, [{Cu(pn)2}2Ni(NCS)6]n·2nH2O (1), [{CuII(trien)}2Ni(NCS)6CuI(NCS)]n (2) and [Cu(tren)(NCS)]4[Ni(NCS)6] (3) (pn = 1,2-diaminopropane, trien = triethylenetetramine and tren = tris(2-aminoethylo)amine), were obtained and characterized by X-ray analysis, IR spectra, XAS and magnetic measurements. Compounds 1, 2 and 3 show the structural diversity of 2D, 1D and 0D compounds, respectively. Depending on the polyamine used, different coordination polyhedron for Cu(II) was found, i.e., distorted octahedral (1), square pyramidal (2) and trigonal bipyramidal (3), whereas coordination polyhedron for nickel(II) was always octahedral. It provides an approach for tailoring magnetic properties by proper selection of auxiliary ligands determining the topology. In 1, thiocyanate ligands form bridges between the copper and nickel ions, creating 2D layers of sql topology with weak ferromagnetic interactions. Compound 2 is a mixed-valence copper coordination polymer and shows the rare ladder topology of 1D chains decorated with [CuII(tren)]2+ antennas as the side chains attached to nickel(II). The ladder rails are formed by alternately arranged Ni(II) and Cu(I) ions connected by N2 thiocyanate anions and rungs made by N3 thiocyanate. For the Cu(I) ions, the tetrahedral thiocyanate environment mixed N/S donor atoms was found, confirming significant coordination spheres rearrangement occurring at the copper precursor together with the reduction in some Cu(II) to Cu(I). Such topology enables significant simplification of the magnetic properties modeling by assuming magnetic coupling inside {NiIICuII2} trinuclear units separated by diamagnetic [Cu(NCS)(SCN)3]3− linkers. Compound 3 shows three discrete mononuclear units connected by N-H…N and N-H…S hydrogen bonds. Analysis of XAS proves that the average ligand character and the covalency of the unoccupied metal d-based orbitals for copper(II) and nickel(II) increase in the following order: 1 ® 2 ® 3. In 1 and 2, a weak ferromagnetic coupling between copper(II) and nickel(II) was found, but in 2, additional and stronger antiferromagnetic interaction between copper(II) ions prevailed. Compound 3, as an ionic pair, shows, as expected, a spin-only magnetic moment.

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Vilchez, Neils, Manuel Ortega Varela de Seijas, Andreas Bardenhagen, Thomas Rohr, and Enrico Stoll. "A Novel Induction Heater for Sintering Metal Compacts with a Hybrid Material Extrusion Device." Electronics 12, no. 14 (2023): 3033. http://dx.doi.org/10.3390/electronics12143033.

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The traditional sintering of metallic components shaped via Material Extrusion Additive Manufacturing (MEAM) is a time-consuming process that involves sophisticated energy-intensive heating systems. This work describes a novel induction heater capable of efficiently tailoring temperature profiles to densify MEAM powder compacts. In situ sintering within the same device is achieved indirectly by heating a graphite crucible, whereby the heater is based on an inverter with a half-bridge topology using the Zero-Voltage Switching (ZVS) technique. The system comprises a bank of capacitors that, in conjunction with a work coil, form a parallel-topology resonant circuit. This design allows the inverter to be used as a current amplifier, thereby increasing its efficiency to deliver an output power of up to 5 kW. The device operates at a 62.86 kHz resonant frequency, achieving a 2.01 mm penetration depth and a 1365.7 °C crucible temperature with only 1.313 kW of consumption, providing an increase in efficiency compared to other low-cost systems. Equipped with a feedback circuit, it offers five distinct control techniques that enable the self-tuning of the crucible temperature. The results indicate that the Cohen–Coon tuning method is more robust compared to the Ziegler–Nichols, damped, no overshoot, and mixed techniques. Sintering with this novel induction heater provides an alternative method for reducing the processing times for MEAM geometries, paving the way for increased efficiency and reduced energy consumption. Circuit diagrams, simulations, and experimental data on the temperature, time, and output voltage are provided in this article.

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Rauch, Philip, Martin Aichholzer, Carlo Serra, et al. "From molecular signatures to radiomics: tailoring neurooncological strategies through forecasting of glioma growth." Neurosurgical Focus 56, no. 2 (2024): E5. http://dx.doi.org/10.3171/2023.11.focus23685.

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OBJECTIVE Contemporary oncological paradigms for adjuvant treatment of low- and intermediate-grade gliomas are often guided by a limited array of parameters, overlooking the dynamic nature of the disease. The authors’ aim was to develop a comprehensive multivariate glioma growth model based on multicentric data, to facilitate more individualized therapeutic strategies. METHODS Random slope models with subject-specific random intercepts were fitted to a retrospective cohort of grade II and III gliomas from the database at Kepler University Hospital (n = 191) to predict future mean tumor diameters. Deep learning–based radiomics was used together with a comprehensive clinical dataset and evaluated on an external prospectively collected validation cohort from University Hospital Zurich (n = 9). Prediction quality was assessed via mean squared prediction error. RESULTS A mean squared prediction error of 0.58 cm for the external validation cohort was achieved, indicating very good prognostic value. The mean ± SD time to adjuvant therapy was 28.7 ± 43.3 months and 16.1 ± 14.6 months for the training and validation cohort, respectively, with a mean of 6.2 ± 5 and 3.6 ± 0.7, respectively, for number of observations. The observed mean tumor diameter per year was 0.38 cm (95% CI 0.25–0.51) for the training cohort, and 1.02 cm (95% CI 0.78–2.82) for the validation cohort. Glioma of the superior frontal gyrus showed a higher rate of tumor growth than insular glioma. Oligodendroglioma showed less pronounced growth, anaplastic astrocytoma—unlike anaplastic oligodendroglioma—was associated with faster tumor growth. Unlike the impact of extent of resection, isocitrate dehydrogenase (IDH) had negligible influence on tumor growth. Inclusion of radiomics variables significantly enhanced the prediction performance of the random slope model used. CONCLUSIONS The authors developed an advanced statistical model to predict tumor volumes both pre- and postoperatively, using comprehensive data prior to the initiation of adjuvant therapy. Using radiomics enhanced the precision of the prediction models. Whereas tumor extent of resection and topology emerged as influential factors in tumor growth, the IDH status did not. This study emphasizes the imperative of advanced computational methods in refining personalized low-grade glioma treatment, advocating a move beyond traditional paradigms.

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Hedayatrasa, Saeid, Mathias Kersemans, Kazem Abhary, Mohammad Uddin, James K. Guest, and Wim Van Paepegem. "Maximizing bandgap width and in-plane stiffness of porous phononic plates for tailoring flexural guided waves: Topology optimization and experimental validation." Mechanics of Materials 105 (February 2017): 188–203. http://dx.doi.org/10.1016/j.mechmat.2016.12.003.

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Alkhader, Maen, Bassam Abu-Nabah, Mostafa Elyoussef, and T. A. Venkatesh. "Design of honeycomb structures with tunable acoustic properties." MRS Advances 4, no. 44-45 (2019): 2409–18. http://dx.doi.org/10.1557/adv.2019.355.

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ABSTRACTHoneycomb structures, owing to their microstructural periodicity, exhibit unique and complex acoustic properties. Tuning their acoustic properties typically involves either changing their topology or porosity. The former route can lead to topologies that may not be readily amenable for large-scale production, while the latter could negatively affect the honeycombs’ weight. An ideal approach for tailoring the acoustic behavior of honeycombs should neither affect their porosity nor should they require customized and expensive fabrication methods. In this work, a novel honeycomb design that alters the microstructural topological features in a relatively simple way, while preserving the porosity of the honeycombs, to tune the acoustic properties of the honeycombs is proposed. The proposed honeycomb can be fabricated using the traditional approach employed to mass produce honeycomb structures; that is by bonding identical corrugated sheets with two periodic thicknesses. The acoustic behavior of the proposed honeycomb in terms of dispersion and phase velocities is analyzed using the finite element method. Simulation results demonstrate the potential of the designed honeycomb to exhibit tailored acoustic behavior at a constant porosity or mass. For example, it is demonstrated that the phase velocities of asymmetric and symmetric waves traversing the proposed honeycomb of aluminum with 90% porosity can be tuned by 30% and 17%, respectively.

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Rico-Baeza, Genaro, Enrique Cuan-Urquizo, Gerardo I. Pérez-Soto, Luis A. Alcaraz-Caracheo, and Karla A. Camarillo-Gómez. "Additively Manufactured Lattice Materials with a Double Level of Gradation: A Comparison of Their Compressive Properties when Fabricated with Material Extrusion and Vat Photopolymerization Processes." Materials 16, no. 2 (2023): 649. http://dx.doi.org/10.3390/ma16020649.

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Natural porous materials adjust their resulting mechanical properties by the optimal use of matter and space. When these are produced synthetically, they are known as mechanical metamaterials. This paper adds degrees of tailoring of mechanical properties by producing double levels of gradation in lattice structures via cross-section variation in struts in uniformly periodic lattice structures (UPLS) and layered lattice structures (LLS). These were then additively manufactured via material extrusion (ME) and vat photopolymerization (VP). Their effective mechanical properties under compressive loads were characterized, and their stiffness contrasted with finite element models (FEM). According to the simulation and experimental results, a better correlation was obtained in the structures manufactured via VP than by ME, denoting that printing defects affect the correlation results. The brittle natural behavior of the resin caused a lack of a plateau region in the stress–strain curves for the UPLS structures, as opposed to those fabricated with ME. The LLS increased energy absorption up to % and increased the plateau stress up to % compared to the UPLS. The results presented in this paper demonstrate that the mechanical properties of lattice structures with the same base topology could be modified by incorporating variations in the strut diameter and then arranging these differently.

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Maier, Sabine. "On-Surface Synthesis of Macrocycles, Non-Planar Carbon Ribbons and Heteroatom-Doped Nanographenes." ECS Meeting Abstracts MA2024-01, no. 16 (2024): 1197. http://dx.doi.org/10.1149/ma2024-01161197mtgabs.

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On-surface synthesis via covalent coupling of adsorbed molecules on metal surfaces has attracted significant attention recently due to its potential to fabricate low-dimensional carbon materials with atomic precision. The bottom-up, atomically precise synthesis of carbon nanostructures enables the tailoring of their electronic properties at a molecular level. To understand and control the surface-chemistry-driven synthesis, many efforts have been made to design innovative precursors, explore novel reaction schemes, and utilize templating effects from the substrate. My presentation focuses on high-resolution scanning probe microscopy experiments combined with density functional theory to demonstrate recent highlights on the assembly of surface-supported low-dimensional carbon structures on metal surfaces. First, the assembly and electronic structure of planar π-extended cycloparaphenylene macrocycles, representing the first nanographene with an all-armchair edge topology, will be presented [1]. The second part will discuss the bottom-up synthesis of covalently-linked non-planar carbon ribbons and their electronic properties depending on their adsorption geometry. Finally, I will conclude with the on-surface cyclomerization of oxygen heterocycles to understand the on-surface synthesis of furan and pyran derivatives from ketone-functionalized precursors on metal surfaces. [1] Xiang, et al. Nature Chem., 2022 14, 871–876.

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Talantsev, Artem, Amir Elzwawy, Sung Joon Kim, and CheolGi Kim. "Corrigendum to “Microscopic manipulations of interatomic coupling density for tailoring of exchange bias mediated by mesoscopic interface topology” [Appl. Surf. Sci. 558 (2021) 149861]." Applied Surface Science 565 (November 2021): 150299. http://dx.doi.org/10.1016/j.apsusc.2021.150299.

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Silva, Miguel R., João A. Dias-de-Oliveira, António M. Pereira, Nuno M. Alves, Álvaro M. Sampaio, and António J. Pontes. "Design of Kinematic Connectors for Microstructured Materials Produced by Additive Manufacturing." Polymers 13, no. 9 (2021): 1500. http://dx.doi.org/10.3390/polym13091500.

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The main characteristic of materials with a functional gradient is the progressive composition or the structure variation across its geometry. This results in the properties variation in one or more specific directions, according to the functional application requirements. Cellular structure flexibility in tailoring properties is employed frequently to design functionally-graded materials. Topology optimisation methods are powerful tools to functionally graded materials design with cellular structure geometry, although continuity between adjacent unit-cells in gradient directions remains a restriction. It is mandatory to attain a manufacturable part to guarantee the connectedness between adjoining microstructures, namely by ensuring that the solid regions on the microstructure’s borders i.e., kinematic connectors) match the neighboring cells that share the same boundary. This study assesses the kinematic connectors generated by imposing local density restrictions in the initial design domain (i.e., nucleation) between topologically optimised representative unit-cells. Several kinematic connector examples are presented for two representatives unit-cells topology optimised for maximum bulk and shear moduli with different volume fractions restrictions and graduated Young’s modulus. Experimental mechanical tests (compression) were performed, and comparison studies were carried out between experimental and numerical Young’s modulus. The results for the single maximum bulk for the mean values for experimental compressive Young’s modulus (Ex¯) with 60%Vf show a deviation of 9.15%. The single maximum shear for the experimental compressive Young’s modulus mean values (Ex¯) with 60%Vf, exhibit a deviation of 11.73%. For graded structures, the experimental mean values of compressive Young’s moduli (Ex¯), compared with predicted total Young’s moduli (ESe), show a deviation of 6.96 for the bulk graded structure. The main results show that the single type representative unit-cell experimental Young’s modulus with higher volume fraction presents a minor deviation compared with homogenized data. Both (i.e., bulk and shear moduli) graded microstructures show continuity between adjacent cells. The proposed method proved to be suitable for generating kinematic connections for the design of shear and bulk graduated microstructured materials.

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Zhang, Chi, Zewei Yi, and Wei Xu. "Scanning probe microscopy in probing low-dimensional carbon-based nanostructures and nanomaterials." Materials Futures 1, no. 3 (2022): 032301. http://dx.doi.org/10.1088/2752-5724/ac8a63.

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Abstract Carbon, as an indispensable chemical element on Earth, has diverse covalent bonding ability, which enables construction of extensive pivotal carbon-based structures in multiple scientific fields. The extraordinary physicochemical properties presented by pioneering synthetic carbon allotropes, typically including fullerenes, carbon nanotubes, and graphene, have stimulated broad interest in fabrication of carbon-based nanostructures and nanomaterials. Accurate regulation of topology, size, and shape, as well as controllably embedding target sp n -hybridized carbons in molecular skeletons, is significant for tailoring their structures and consequent properties and requires atomic precision in their preparation. Scanning probe microscopy (SPM), combined with on-surface synthesis strategy, has demonstrated its capabilities in fabrication of various carbon-based nanostructures and nanomaterials with atomic precision, which has long been elusive for conventional solution-phase synthesis due to realistic obstacles in solubility, isolation, purification, etc. More intriguingly, atom manipulation via an SPM tip allows unique access to local production of highly reactive carbon-based nanostructures. In addition, SPM provides topographic information of carbon-based nanostructures as well as their characteristic electronic structures with unprecedented submolecular resolution in real space. In this review, we overview recent exciting progress in the delicate application of SPM in probing low-dimensional carbon-based nanostructures and nanomaterials, which will open an avenue for the exploration and development of elusive and undiscovered carbon-based nanomaterials.

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Xie, Haoyang, and Yueqi Zhong. "Structure-consistent customized virtual mannequin reconstruction from 3D scans based on optimization." Textile Research Journal 90, no. 7-8 (2019): 937–50. http://dx.doi.org/10.1177/0040517519883957.

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The 3D virtual mannequin has been widely used in apparel industry, and its importance is also increasing. This work develops a new 3D virtual mannequin reconstruction system based on optimization. All the mannequins reconstructed by the proposed approach share the identical topology, that is, there is a point-to-point correspondence among the mannequins, which will significantly facilitate much subsequent processing in fashion design, made-to-measure, and virtual try-on. The inputs to the proposed system contain a template human body, a raw scan (represented in mesh), and a very sparse corresponding landmarks set. The proposed approach substantially utilizes the optimization technology to drive the template to deform into a real scan. There is no special requirement on the raw meshes. The raw meshes may have a different number of vertices and triangles or may even be incomplete. The proposed method only needs 21 landmarks as hard-constraints to reconstruct a mannequin with tens of thousands of vertices. These landmarks can be extracted automatically for standard mannequin reconstruction. Besides the standard mannequin, the proposed system can also be used to reconstruct display mannequins, that is, mannequins with various poses. The experiments visualize the optimization procedure and verify that the optimization is efficient and effective. Quantitative analysis also proves that the reconstruction error satisfies the requirements of fashion design and tailoring.

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Ghaffari, Sarvenaz, Guillaume Seon, and Andrew Makeev. "Effect of Fiber–Matrix Interface Friction on Compressive Strength of High-Modulus Carbon Composites." Molecules 28, no. 5 (2023): 2049. http://dx.doi.org/10.3390/molecules28052049.

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Carbon-fiber-reinforced polymers (CFRPs) enable lightweight, strong, and durable structures for many engineering applications including aerospace, automotive, biomedical, and others. High-modulus (HM) CFRPs enable the most significant improvement in mechanical stiffness at a lower weight, allowing for extremely lightweight aircraft structures. However, low fiber-direction compressive strength has been a major weakness of HM CFRPs, prohibiting their implementation in the primary structures. Microstructural tailoring may provide an innovative means for breaking through the fiber-direction compressive strength barrier. This has been implemented by hybridizing intermediate-modulus (IM) and HM carbon fibers in HM CFRP toughened with nanosilica particles. The new material solution almost doubles the compressive strength of the HM CFRPs, achieving that of the advanced IM CFRPs currently used in airframes and rotor components, but with a much higher axial modulus. The major focus of this work has been understanding the fiber–matrix interface properties governing the fiber-direction compressive strength improvement of the hybrid HM CFRPs. In particular, differences in the surface topology may cause much higher interface friction for IM carbon fibers compared to the HM fibers, which is responsible for the interface strength improvement. In situ Scanning Electron Microscopy (SEM)-based experiments were developed to measure interface friction. Such experiments reveal an approximately 48% higher maximum shear traction due to interface friction for IM carbon fibers compared to the HM fibers.

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Ascrizzi, Eleonora, Chiara Ribaldone, and Silvia Casassa. "Crucial Role of Ni Point Defects and Sb Doping for Tailoring the Thermoelectric Properties of ZrNiSn Half-Heusler Alloy: An Ab Initio Study." Materials 17, no. 5 (2024): 1061. http://dx.doi.org/10.3390/ma17051061.

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In the wide group of thermoelectric compounds, the half-Heusler ZrNiSn alloy is one of the most promising materials thanks to its thermal stability and narrow band gap, which open it to the possibility of mid-temperature applications. A large variety of defects and doping can be introduced in the ZrNiSn crystalline structure, thus allowing researchers to tune the electronic band structure and enhance the thermoelectric performance. Within this picture, theoretical studies of the electronic properties of perfect and defective ZrNiSn structures can help with the comprehension of the relation between the topology of defects and the thermoelectric features. In this work, a half-Heusler ZrNiSn alloy is studied using different defective models by means of an accurate Density Functional Theory supercell approach. In particular, we decided to model the most common defects related to Ni, which are certainly present in the experimental samples, i.e., interstitial and antisite Ni and a substitutional defect consisting of the replacement of Sn with Sb atoms using concentrations of 3% and 6%. First of all, a comprehensive characterization of the one-electron properties is performed in order to gain deeper insight into the relationship between structural, topological and electronic properties. Then, the effects of the modeled defects on the band structure are analyzed, with particular attention paid to the region between the valence and the conduction bands, where the defective models introduce in-gap states with respect to the perfect ZrNiSn crystal. Finally, the electronic transport properties of perfect and defective structures are computed using semi-classical approximation in the framework of the Boltzmann transport theory as implemented in the Crystal code. The dependence obtained of the Seebeck coefficient and the power factor on the temperature and the carrier concentration shows reasonable agreement with respect to the experimental counterpart, allowing possible rationalization of the effect of the modeled defects on the thermoelectric performance of the synthesized samples. As a general conclusion, defect-free ZrNiSn crystal appears to be the best candidate for thermoelectric applications when compared to interstitial and antisite Ni defective models, and substitutional defects of Sn with Sb atoms (using concentrations of 3% and 6%) do not appreciably improve electronic transport properties.

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Kim, Jae Chul. "(Invited) Developing Periodically-Aligned Fibrous Structures to Suppress Lithium Dendrites for Anode-Free Batteries." ECS Meeting Abstracts MA2024-01, no. 2 (2024): 237. http://dx.doi.org/10.1149/ma2024-012237mtgabs.

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We have developed electrospinning-based manufacturing capability for dendrite-free anode-free and anode-less batteries. Electrospinning is a widely used, feasible manufacturing approach to create nano- and micro-porous layers of functional fibers. By tailoring fiber compositions, the electrospun layers can afford a wide variety of functionalities applicable to biomedical templates, separation membranes, and energy storage. Its manufacturing capability is, however, limited to producing randomly oriented fibrous structures. Topology and tortuosity of the electrospun fibrous layers are poorly controlled, making it difficult to systematically investigate structure-property relationships for any given applications, especially electrochemical systems. In this presentation, we will demonstrate how to improve the controllability of fiber construction geometry by electrospinning. Unlike conventional electrospinning, our approach employs a mobile stage that allows precise alignment of fibers. Produced fibrous structures will be used to construct current collectors of the anode-free batteries, one of the proposed beyond-lithium (Li)-ion battery systems for high energy density. While direct, yet reversible, Li plating and stripping on and from the current collector has proven difficult due to uncontrolled dendrite growth, we found that the flat copper foil reinforced by the three-dimensional fibrous structure can enhance Li storage efficiency over an extended number of cycles, outperforming the planar case. We will discuss the effect of fiber compositions and controlled geometrical configurations on stabilizing Li plating and stripping morphologies to suppress Li dendrite growth and provide a fundamental design principle to construct anode-free and anode-less battery cells. Battery manufacturing advanced by this work will offer a systematic strategy to develop next-generation energy storage systems for a sustainable energy future.

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Liu, Kai. "(Invited) Magneto-Ionic Control of Heterostructures and Interfaces." ECS Meeting Abstracts MA2022-01, no. 19 (2022): 1051. http://dx.doi.org/10.1149/ma2022-01191051mtgabs.

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Magneto-ionics has shown promise for energy-efficient nanoelectronics, where ionic migration can be used to achieve atomic scale control of interfaces in magnetic nanostructures, and in turn modulate a wide variety of functionalities. Recently, we have discovered that chemisorbed oxygen and hydrogen on the surface of ferromagnetic films can induce significant Dzyaloshinskii–Moriya interaction (DMI) [1], a handle to introduce topology into nanoscale magnets. This has enabled direct tailoring of skyrmions winding number as well as wall type at room temperature via oxygen chemisorption. We have also demonstrated a sensitive and reversible chirality switching of magnetic domain walls [2] and writing/deleting of skyrmions [3] via hydrogen chemisorption/desorption. These chemisorption induced magnetic effects on controlled ferromagnet surfaces offer an ideal platform to gain quantitative understanding of magneto-ionics at buried interfaces, where the ionic motion can be further controlled by an electric field [4]. These effects are relevant for 3-dimensional information storage as a potentially contactless way to address spin textures, such as in interconnected nanowire networks [5]. Interestingly, nanoporous metal foams made of random assemblies of nanowires have found applications in deep-submicron particulate filtration, relevant to combatting COVID-19 and air pollution. Such foams are efficient, breathable, light-weight, robust, and can be reused and recycled [6]. Our mask design based on such foams has been selected by BARDA-NIOSH as a Phase 1 Winner of the Mask Innovation Challenge [7]. [1] Science Advances, 6, eaba4924 (2020). [2] Physical Review X, 11, 021015 (2021). [3] DOI: https://doi.org/10.21203/rs.3.rs-575830/v1 [4] ACS Applied Materials and Interfaces, 13, 38916−38922 (2021). [5] Nano Letters, 21, 716-722 (2021). [6] Nano Letters, 21, 2968-2974 (2021). [7] https://drive.hhs.gov/mask_challenge.html. This work has been supported by the NSF (DMR-1905468, DMR-2005108, ECCS-1933527), the nCORE SMART center through SRC/NIST, the University of California and Georgetown University.

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Li, J., A. Tan, K. W. Moon, et al. "Tailoring the topology of an artificial magnetic skyrmion." Nature Communications 5, no. 1 (2014). http://dx.doi.org/10.1038/ncomms5704.

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Bagheri, Sara, Mohsen Adeli, Abedin Zabardasti, and Siamak Beyranvand. "Tailoring topology and bio-interactions of triazine frameworks." Scientific Reports 14, no. 1 (2024). http://dx.doi.org/10.1038/s41598-024-64787-x.

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AbstractThe construction of covalent organic frameworks with special geometery and optical properties is of high interest, due to their unique physicochemical and biological properties. In this work, we report on a new method for the construction of triazine frameworks with defined topologies using coordination chemistry. Ball milling and wet chemical reactions between cyanuric chloride and melamine were directed in spatial arrangements and opposite optical activity. Cobalt was used as a directing agent to drive reactions into special morphologies, optical properties and biological activity. The enantiorecognition ability of triazine frameworks that was manifested in their activities against bacteria, demonstrated a new way for the construction of materials with specific interactions at biointerfaces.

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Bagheri, Sara, Mohsen Adeli, Abedin Zabardasti, and Siamak Beyranvand. "Author Correction: Tailoring topology and bio-interactions of triazine frameworks." Scientific Reports 14, no. 1 (2024). http://dx.doi.org/10.1038/s41598-024-69801-w.

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Ochkan, Kyrylo, Raghav Chaturvedi, Viktor Könye, et al. "Non-Hermitian topology in a multi-terminal quantum Hall device." Nature Physics, January 18, 2024. http://dx.doi.org/10.1038/s41567-023-02337-4.

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AbstractQuantum devices characterized by non-Hermitian topology are predicted to show highly robust and potentially useful properties for precision sensing and signal amplification. However, realizing them has remained a daunting experimental task, as non-Hermiticity is often associated with gain and loss, which would require precise tailoring to produce the signatures of non-trivial topology. Here, instead of gain and loss, we use the non-reciprocity of quantum Hall edge states to directly observe non-Hermitian topology in a multi-terminal quantum Hall ring. Our transport measurements evidence a robust, non-Hermitian skin effect, characterized by currents and voltages showing an exponential profile that persists across Hall plateau transitions away from the regime of maximum non-reciprocity. Our observation of non-Hermitian topology in a quantum device introduces a scalable experimental approach to construct and investigate generic non-Hermitian systems.

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Ebrahimi, Mahsa, Mariana Arreguín-Campos, Aaliyah Z. Dookhith, et al. "Tailoring Network Topology in Mechanically Robust Hydrogels for 3D Printing and Injection." ACS Applied Materials & Interfaces, May 7, 2024. http://dx.doi.org/10.1021/acsami.4c03209.

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Li, Yan, Zhongyu Shi, Bojie Xu, Lei Jiang, and Huan Liu. "Bioinspired Plateau–Rayleigh Instability on Fibers: From Droplets Manipulation to Continuous Liquid Films." Advanced Functional Materials, May 13, 2024. http://dx.doi.org/10.1002/adfm.202316017.

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AbstractThe Plateau–Rayleigh instability (PRI) of a liquid column, which always spontaneously breaks into droplets to minimize surface energy, underlies a variety of fascinating phenomena in daily life and industrial applications. Different from the free liquid column, the evolution of the liquid film on a fiber involves solid‐liquid interfaces which allow for regulating the PRI. Recently, natural fibers with certain topologies have witnessed various dynamic liquid behaviors from droplet manipulation to continuous liquid films. Tailoring the topology of local curved liquid film by the structural‐confinement is the key to manipulating liquids, where the asymmetric Laplace pressure generated by the asymmetric/non‐spherical liquid film promotes the liquid motion. In nature, the spider silk collects droplets efficiently by the spindle‐knot structure; while the mulberry silk enables a smooth surface‐coating on dual‐parallel fibers. Drawing inspirations, many artificial structured fibers are developed to precisely regulate liquid behaviors in the form of either separated droplets or continuous liquid films, which have demonstrated applications as fluidic coating, micro‐patterning, and materials fabrication. Here, recent research progress on bioinspired fibrous PRI from the viewpoints of tailoring the Laplace pressure by rationally designing the surface topology, which offers inspiration for liquid manipulation using open fibrous media, is reviewed.

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