Bibliografías temáticas / Chiral Geometries

Literatura académica sobre el tema "Chiral Geometries"

Autor: Grafiati
Publicado: 6 de septiembre de 2023
Última modificación: 7 de septiembre de 2023

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Artículos de revistas sobre el tema "Chiral Geometries"

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De Santo, Maria Penelope, Lorenza Spina y Federica Ciuchi. "Chiral Chromonics Confined in Spherical Geometries". Applied Sciences 13, n.º 7 (2 de abril de 2023): 4507. http://dx.doi.org/10.3390/app13074507.

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Chromonic liquid crystals have recently received a lot of attention due to their spontaneous self-assembly in supramolecular columnar structures that, depending on their concentration in water, align to form a nematic liquid crystalline phase. The chirality may be induced in chromonics by adding chiral moieties to the nematic phase or enhanced by confining them in curved geometrical constraints. This review summarizes the recent research developments on chiral chromonic liquid crystals confined in spherical geometry, relating the results to what was observed for thermotropic liquid crystals in the same conditions. The review focuses on the studies carried out on commercially available nematic chromonics, investigating the effects on their topologies in different anchoring conditions and different chiral dopants and suggesting an application in the sensor field.
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Leemans, Dimitri y Philippe Tranchida. "On residual connectedness in chiral geometries". Algebraic Combinatorics 4, n.º 3 (22 de junio de 2021): 491–99. http://dx.doi.org/10.5802/alco.162.

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Lowe, David A. y Shubho Roy. "Chiral geometries of (2+1)-d AdS gravity". Physics Letters B 668, n.º 2 (octubre de 2008): 159–62. http://dx.doi.org/10.1016/j.physletb.2008.08.026.

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Öeren, Mario, Elena Shmatova, Toomas Tamm y Riina Aav. "Computational and ion mobility MS study of (all-S)-cyclohexylhemicucurbit[6]uril structure and complexes". Phys. Chem. Chem. Phys. 16, n.º 36 (2014): 19198–205. http://dx.doi.org/10.1039/c4cp02202e.

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Ma, Wei, Changlong Hao, Maozhong Sun, Liguang Xu, Chuanlai Xu y Hua Kuang. "Tuning of chiral construction, structural diversity, scale transformation and chiroptical applications". Materials Horizons 5, n.º 2 (2018): 141–61. http://dx.doi.org/10.1039/c7mh00966f.

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Dissymmetry is crucial for chiral geometries that utilize either intrinsic anisotropy forces around nanoparticles (NPs) or external organization associated with templates or applied fields and alignment.
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Chen, Sicong, Qiwen Teng y Shi Wu. "Theoretical studies on the binding affinities of β-cyclodextrin to small molecules and monosaccharides". Open Chemistry 4, n.º 2 (1 de junio de 2006): 223–33. http://dx.doi.org/10.2478/s11532-006-0013-5.

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AbstractEquilibrium geometries and electronic structures of complexes between β-cyclodextrin (β-CD) and some small molecules as well as monosaccharides were investigated by Austin Model 1 (AM1) to obtain binding energy of the complexes. It was indicated that β-CD could bind the structurally similar solvent molecules and monosaccharides because of the negative binding energy of the complexes, and especially could show the chiral binding ability to monosaccharides with more hydroxyl groups, due to its chiral characteristics. The complexes were stabilized by the hydrogen bonding between β-CD and guests. Based on the AM1 optimized geometries, the IR spectra were calculated by AM1 method. Vibration frequencies of O-H bonds in the guests were red-shifted owing to the weakening of the O-H bonds with the formation of the complexes.
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Skolnick, Jeffrey, Hongyi Zhou y Mu Gao. "On the possible origin of protein homochirality, structure, and biochemical function". Proceedings of the National Academy of Sciences 116, n.º 52 (10 de diciembre de 2019): 26571–79. http://dx.doi.org/10.1073/pnas.1908241116.

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Living systems have chiral molecules, e.g., native proteins that almost entirely contain L-amino acids. How protein homochirality emerged from a background of equal numbers of L and D amino acids is among many questions about life’s origin. The origin of homochirality and its implications are explored in computer simulations examining the stability and structural and functional properties of an artificial library of compact proteins containing 1:1 (termed demi-chiral), 3:1, and 1:3 ratios of D:L and purely L or D amino acids generated without functional selection. Demi-chiral proteins have shorter secondary structures and fewer internal hydrogen bonds and are less stable than homochiral proteins. Selection for hydrogen bonding yields a preponderance of L or D amino acids. Demi-chiral proteins have native global folds, including similarity to early ribosomal proteins, similar small molecule ligand binding pocket geometries, and many constellations of L-chiral amino acids with a 1.0-Å RMSD to native enzyme active sites. For a representative subset containing 550 active site geometries matching 457 (2) 4-digit (3-digit) enzyme classification (E.C.) numbers, native active site amino acids were generated at random for 472 of 550 cases. This increases to 548 of 550 cases when similar residues are allowed. The most frequently generated sequences correspond to ancient enzymatic functions, e.g., glycolysis, replication, and nucleotide biosynthesis. Surprisingly, even without selection, demi-chiral proteins possess the requisite marginal biochemical function and structure of modern proteins, but were thermodynamically less stable. If demi-chiral proteins were present, they could engage in early metabolism, which created the feedback loop for transcription and cell formation.
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Cirilo-Lombardo, Diego Julio. "Born-Infeld generalization: Axion and Kalb-Ramond from dynamical torsion fields". Europhysics Letters 135, n.º 6 (1 de septiembre de 2021): 61001. http://dx.doi.org/10.1209/0295-5075/ac2cfa.

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Abstract We show that in theories of gravitation based on affine geometries the torsion field, that takes a dynamical character, not only the chiral magnetic effect (CME) intervenes in the wash up of the chiral anomaly but also the chiral vortical effect (CVE) and the coupled chiral effect (CCE) coming from the hypermagnetic field interaction with the primordial plasma are crucial in a realistic physical scenario, as in the case of the early universe. We also show that the equation governing the wash up takes the form given in this paper, supplemented with the dynamical equation for the torsion vector containing the helicities and other axial couplings. The role played by the neutrinos in the interaction with the axion field in this theoretical framework is briefly discussed.
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BRACKEN, PAUL. "LINKS BETWEEN THE QUANTUM HALL EFFECT, CHIRAL BOSON THEORIES AND STRING THEORY". International Journal of Modern Physics E 13, n.º 05 (octubre de 2004): 961–71. http://dx.doi.org/10.1142/s021830130400251x.

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Chiral boson theory is introduced and its relevance to the quantum Hall effect is explained. It is shown that the chiral boson theory admits mode expansions which are essentially those which appear and are made use of in bosonic string theories. This immediately leads to a way of quantizing the theory. Restrictions on various parameters appearing in the model can be imposed in a natural way. Finally, it is suggested that some of these ideas have important applications to other geometries which could give rise to new types of physical behavior.
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Sevrin, Alexander, Wieland Staessens y Alexander Wijns. "AnN= 2 worldsheet approach to D-branes in bihermitian geometries: I. Chiral and twisted chiral fields". Journal of High Energy Physics 2008, n.º 10 (29 de octubre de 2008): 108. http://dx.doi.org/10.1088/1126-6708/2008/10/108.

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Tesis sobre el tema "Chiral Geometries"

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Raskin, Samuel David. "Chiral Principal Series Categories". Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11525.

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This thesis begins a study of principal series categories in geometric representation theory using the Beilinson-Drinfeld theory of chiral algebras. We study Whittaker objects in the unramified principal series category. This provides an alternative approach to the Arkhipov-Bezrukavnikov theory of Iwahori-Whittaker sheaves that exploits the geometry of the Feigin-Frenkel semi-infinite flag manifold.
Mathematics
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GOSNAT, MURIEL. "Relations entre parametres thermodynamiques et geometriques dans la resolution chirale par des cyclodextrines modifiees". Paris 12, 2000. http://www.theses.fr/2000PA120034.

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Il est important de controler la purete optique des isomeres et de disposer de methodes de separation des enantiomeres. Une methode utilisee est la formation de complexes diastereoisomeres de proprietes physiques differentes. Actuellement les etudes n'indique pas s'il existe une correlation entre differenciation geometrique et separation physique. La rmn permet de visualiser une reconnaissance chirale. Il y a reconnaissance chirale par difference geometrique. La clhp permet de separer physiquement des isomeres par formation de complexes diastereoisomeres ayant des constantes de complexation differentes. Il y a reconnaissance chirale par difference thermodynamique. La correspondance des resultats des separations et des discriminations n'a jamais ete formellement etablie. Les diverses methodes d'analyse utilisent des complexants differents. Il est necessaire d'etudier un complexant sous ces deux modes de reconnaissance. Cette these a pour objet l'etude des relations entre les parametres thermodynamiques et geometriques dans la reconnaissance chirale par des cyclodextrines (cds) modifiees (la perte de la symetrie intrinseque des cds a une influence positive sur leur reconnaissance). La these se divise en 4 parties. La partie 1 porte sur le choix et le developpement d'une famille de cds, les 3, 6-anhydro--cd. Les syntheses et caracterisations des derives sont decrites. Le choix du selecteur se porte sur la mono-3 a, 6 a-anhydro--cd (les syntheses et analyses des derives di- et per-methyles sont effectuees). La partie 2 porte sur l'utilisation de ces molecules en rmn, pour determiner leur pouvoir discriminant. La partie 3 porte sur l'etude clhp des couples cd/racemique retenus. Les cds seront dans un premier temps greffees sur colonne, puis l'etude est realisee avec le selecteur dans l'eluant. La partie 4 est un approfondissement de l'etude rmn. Les geometries fines des couples diastereoisomeres sont etudiees pour tenter de comprendre les differences observees entre rmn et clhp.
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Nair, Greshma. "Theoretical and Experimental Study of Three-Dimensional Chiro-Optical Materials". Thesis, 2016. http://etd.iisc.ac.in/handle/2005/4072.

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Light-matter interactions at the nanoscale have been widely studied over the past few decades. In particular, the interaction of light with asymmetric nanostructures has harbored the interests of chemists, biologists and physicists alike. The world around us is largely constituted of asymmetric structures such as DNA, sugars, amino-acids, proteins, enzymes which form the backbone of every living matter. Structures which cannot be superimposed on their mirror images are termed as chiral structures. Naturally occurring chiral objects display unique optical properties such as Circular Dichroism (CD) and Optical Rotation, although these effects are typically very weak and occur in the UV. In recent years, researchers have focused in designing artificial chiral substrates with large chiral response in the visible, which are orders of magnitude stronger than the naturally chiral objects. These engineered systems are suitable for a wide range of applications such as broadband circular polarizers, chiral molecule detection and negative refractive index media. The design scheme for chiro-plasmonic systems relied on the assembling plasmonic achiral nanostructures in chiral geometries or fabricating plasmonic materials of chiral geometries. In the work presented in this thesis, we present a detailed theoretical and experimental investigation of plasmonic effects in different two and three dimensional chiral systems. One of the design schemes proposed in this work consists of vertical stacking of oppositely handed 2D chiral structures. Owing to the strong plasmon coupling between the individual nanostructures, there was a significant enhancement in the calculated CD values as opposed to the isolated planar components. Varying the separation and the relative orientation of the layers rendered the optical response tunable in the visible. The other strategy proposed here was placing an achiral plasmonic NP in chiral hotspot of the chiral plasmonic structures. The results from the numerical simulations suggest the interaction between a chiral and achiral NP at close proximity could be a way for enhancing the chiral response in the visible. This is to our knowledge, the first observation of a chiral-achiral metallic plasmonic interaction. Three dimensional chiral structures such as metallic helices or NPs around DNA helix were found to exhibit strong CD effects in the visible. A major focus of this thesis work was the development of wafer-scale, three dimensional metal-decorated helical substrates with one of the largest reported optical responses in the visible. Additionally we investigated theoretically and experimentally the effect of plasmon coupling between the metal helices on the resultant CD and asymmetry factor. The effect of inter-particle separation was found to have a near-exponential dependence on the magnitude of the CD response. On the other hand, changing the refractive index of the dielectric template altered the chiral responses drastically. Finally we investigated a novel geometry of chiral nanoshells consisting of a dielectric helical core with a conformal coating of a metallic shell. The spherical nanoshells have been extensively studied for its distinct plasmonic response and have been utilized for drug-delivery and optical sensing applications. Chiral nanoshells are fundamentally different because of the asymmetric nature of the nanoshell. Moreover the shell is made of alternate plasmonic material-Titanium Nitride which is optically similar to Gold but more robust and chemically stable in comparison. The resulting optical response of the chiral shell geometry was the broadest CD curve we observed until now, covering the whole of visible to near infra-red regime, implying this geometry to be a promising candidate for broadband circular polarizer applications. All the studies carried out in this thesis, gives us an outlook on the possible design scheme and the underlying physics that could help us in engineering the chiral response based on the desired operating range of wavelength.
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Libros sobre el tema "Chiral Geometries"

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Bartoli, Maria Teresa y Monica Lusoli, eds. Diminuzioni e accrescimenti. Florence: Firenze University Press, 2018. http://dx.doi.org/10.36253/978-88-6453-731-3.

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La prospettiva nel figurativo nacque con forma diversa da quella con cui è presentata nella didattica attuale e si sviluppò accompagnando le trasformazioni del pensiero scientifico. Lo studio smonta e rimonta dall’interno le immagini prospettiche di una serie di opere, seguendo con chiare elaborazioni grafiche le trasformazioni del tema. La successione dei saggi spiega l’evolversi del ruolo dell’abaco e della misura nelle opere dei primi artisti-scienziati, secondo il pensiero scientifico della cultura coeva. Dall’Umanesimo al Barocco, la prospettiva si trasforma alla fine, da ricerca sulla verità della visione, in ricerca del suo inganno, attraverso espedienti meccanici e complessi teoremi di ottica geometrica. L’istanza originaria è dissolta nei virtuosismi tecnici. Il repertorio finale offre una selezione di esempi che, attraverso i secoli, fa intravedere la larga dimensione del tema.
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Capítulos de libros sobre el tema "Chiral Geometries"

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Quackenbush, John. "Chiral Gauge Field Theory in Two Dimensions". En Differential Geometric Methods in Theoretical Physics, 315–21. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-9148-7_32.

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Pak, Namik K. y T. Yilmaz. "Quantization of the Chiral Solitonic Bag Model". En Differential Geometric Methods in Theoretical Physics, 87–94. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-9148-7_9.

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Catto, Sultan. "Instantons from Supersymmetric Conformal Chiral Scalar Superfield Theories". En Differential Geometric Methods in Theoretical Physics, 681–88. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-9148-7_66.

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Yao, Shujie. "Geometric Analysis of Selected Policies". En Agricultural Reforms and Grain Production in China, 201–29. London: Palgrave Macmillan UK, 1994. http://dx.doi.org/10.1007/978-1-349-23553-7_8.

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Zhang, Hao, Liyuan He, Chunsheng Wang y Linlin Gao. "Study of Control of Body Geometric Dimensions Precision". En Proceedings of SAE-China Congress 2015: Selected Papers, 163–70. Singapore: Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-978-3_16.

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Zhang, Kunyuan. "Concept of Hypersonic Adaptive Variable Geometric Curved Compression Inlet". En Advanced Topics in Science and Technology in China, 253–79. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0727-4_8.

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Yang, Di, Xinyue Liu, Change Zeng y Yonghong Zhan. "Study on the Geometric Super Resolution by Code Division Multiplexing Technology". En Proceedings of the 28th Conference of Spacecraft TT&C Technology in China, 365–72. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4837-1_28.

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Zhao, Liping. "Analysis and Optimization of Geometric Accuracy of ZY-1 02C HRC Image". En Proceedings of the 7th China High Resolution Earth Observation Conference (CHREOC 2020), 97–113. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-5735-1_7.

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Zhao, Liping, Xingke Fu y Xianhui Dou. "Evaluation and Analysis of Geometric Accuracy of the ZY-1 02D VNIC Image". En Proceedings of the 7th China High Resolution Earth Observation Conference (CHREOC 2020), 57–76. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-5735-1_5.

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"Three-Dimensional Models of a Five-Carbon Sugar Molecule and Nucleic Acids". En Attractors and Higher Dimensions in Population and Molecular Biology, 178–202. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-9651-6.ch007.

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Three-dimensional images of five-carbon sugar molecules and single-stranded nucleic acid molecules (DNA and RNA) were obtained. The geometrical cause of the formation of different form by molecules nucleic acids (right and left spirals with different number of D-ribose and ribose molecules in the period, including closed chains) has been determined. Substituting the known effective values of the lengths of chemical bonds (carbon-carbon, oxygen-oxygen, phosphorus-oxygen) into the structure of polytopes, the values of the characteristic geometric parameters of molecules nucleic acids were calculated: their effective diameter and period. It turned out that the calculated values of these parameters are in good agreement with their values, determined earlier experimentally. It is shown that the set of single-stranded nucleic acids (both DNA and RNA) is broken into two sets of chiral forms. Each form in one set contains a chiral form in another set. Moreover, in each set there are possible rotation of the spirals both in the right and in the left direction.
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Actas de conferencias sobre el tema "Chiral Geometries"

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Samadikhah, Kaveh y Giulia Lanzara. "Can Micro-Chiral Cellular Structures Be Auxetic?" En ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47771.

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Auxetic materials with negative Poisson’s ratio have recently attracted the interest of the scientific community. This is because these materials have the potential to deliver specific functions thanks to a discretization of their constitutive matter that is intended as an aggregation of macro-scaled cellular structures characterized by specific geometries. Many auxetic structures with different geometries and auxetic response have been proposed. Downscaling the cellular structures (e.g. microscale) has the potential to improve the overall auxetic properties of the material, yet there is not enough research on the behavior of these structures at the microscale. This paper studies the auxetic behavior of a modified hexachiral structure formed by microscale elements. First an optimization study was performed to define the most appropriate geometrical dimensions. Then the auxeticity of the proposed cell was assessed carefully introducing a new Coefficient of Auxeticity which allowed to capture complex mechanical responses (e.g. including cellular rotations) as those faced with the proposed design. The proposed miniaturized design shows an outstanding stable auxetic response up to 20% strain of the micro-cell. It is believed that this study has the potential to pave the way to a new class of auxetic materials.
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Kolla, Avinash, Jaehyung Ju, Joshua D. Summers, George Fadel y John C. Ziegert. "Design of Chiral Honeycomb Meso-Structures for High Shear Flexure". En ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28557.

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Chiral honeycombs are auxetic cellular structures that exhibits negative Poison’s ratio. Chiral honeycombs are structures arranged in an array of cylinders connected by ligaments. Four different configurations of these geometries with 4- and 6- ligaments attached are investigated for its use in shear layer of non-pneumatic wheel. The objective of the study is to find an ideal geometry for the shear layer while meeting its requirements of shear properties (about 6.5 MPa effective shear modulus and 0.15 maximum effective shear strain) with polycarbonate as base material. Finite Element (FE) based numerical tests are carried out and optimum chiral meso-structures are found for the target shear properties. Parametric studies on geometries are also conducted to find the effect of geometries on the target properties. The effect of cell wall thickness is studied and the optimum thickness is suggested to meet the target requirements. Effect of direction of shear loading has been studied on each different configuration in order to minimize the effect of direction of loading.
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Kotov, Nicholas A. "Chirality and Complexity of Phootonically Active Nanostructures". En Novel Optical Materials and Applications. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/noma.2022.notu3e.3.

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Nanoscale chirality is a rapidly emerging field in science and engineering. The early observation of strong circular dichroism for individual nanoparticles (NPs) and their assemblies have developed into a rapidly expanding research area on chiral inorganic nanostructures. They encompass a large family of mirror-asymmetric constructs from metals, semiconductors, ceramics, and nanocarbons with multiple chiral geometries with characteristic scales from Ångströms to microns (Figure 1).
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Heo, Hyeonu, Jaehyung Ju, Doo-Man Kim y Chang-Soo Jeon. "Passive Morphing Airfoil With Honeycombs". En ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64350.

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A passive morphing may improve the aerodynamic characteristics through structural shape change by aerodynamic loads during the flight, resulting in improving fuel efficiency. The passive morphing structure should have a capability to be highly deformed while maintaining a sufficient stiffness in bending. Honeycombs may be good for controlling both stiffness and flexibility. This paper investigates a honeycomb airfoil’s static deformations through the fluid-structure interaction using computational fluid dynamics and structural finite element analysis. The structural performance will be investigated with varying honeycomb geometries including regular, auxetic and chiral meso-structures.
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Cuomo, M. "Design of architected materials composed by periodic surfaces". En AIMETA 2022. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902431-87.

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Abstract. Architected materials possess extraordinary mechanical properties, that cannot be met by natural materials, either in the static and in the dynamic range. For this reason, the study of metamaterials is a very active field of research. Although lattice architectures are commonly preferred, especially for the relative simplicity of manufacturing, geometries based on thin shells may present considerable advantages. Indeed it has been shown that shell metamaterials, still preserving lightness and versatility, can present excellent stiffness and strength properties, and ability to absorb strain energy by means of very large deformations, that make them useful for the design of shock absorbing elements. In the contribution will be examined a class of shell metamaterials, composed of triple periodic minimal surfaces TPMS, that having zero mean curvature can be in equilibrium with an isotropic state of stress. Two particular surfaces, the Schwarz P and the Schwarz G minimal surfaces, the first centro-symmetric, the second chiral, are examined.
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Smirnova, Olga. "Ultrafast Chiral Dynamics and Geometric Fields in Chiral Molecules". En Nobel Symposium 167: Chiral Matter. WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811265068_0014.

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PERK, Jacques H. H. y Helen AU-YANG. "Recent Developments on Ising and Chiral Potts Model". En Proceedings of the 23rd International Conference of Differential Geometric Methods in Theoretical Physics. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812772527_0035.

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FUJIKAWA, KAZUO. "GEOMETRIC PHASE AND CHIRAL ANOMALY: THEIR BASIC DIFFERENCES". En Statistical Physics, High Energy, Condensed Matter and Mathematical Physics - The Conference in Honor of C. N. Yang'S 85th Birthday. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812794185_0010.

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FUJIKAWA, K. "GEOMETRIC PHASE AND CHIRAL ANOMALY IN PATH INTEGRAL FORMULATION". En Proceedings of the 9th International Conference. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812837271_0013.

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Rajkumar, R., N. Yogesh, V. Subramanian y Isabelle Huynen. "Nearly-perfect circular polarization converter formed by triangular-geometric chiral metamaterial". En 2016 10th European Conference on Antennas and Propagation (EuCAP). IEEE, 2016. http://dx.doi.org/10.1109/eucap.2016.7481563.

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