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Dissertations / Theses on the topic 'Lattice naturale'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

MASCIA, CLAUDIA. "Studio di componenti del lattice di Euphorbia characias." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266809.

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The aim of the present study was to contribute to the knowledge of the components of the latex, a milky fluid exudated from the Mediterranean shrub Euphorbia characias. The antioxidant and acetylcholinesterase inhibitory activities were explored in E. characias. The latex was extracted using several conventional methods and a new procedure involving the use of the trichloroacetic acid. The results of this research indicate that E. characias latex exhibits antioxidant activities, is rich in total polyphenolic and flavonoids content and exhibited substantial inhibition of acetylcholinest

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TAGLIARO, IRENE. "NOVEL COLLOIDAL APPROACH TO PREPARE HIGHLY-LOADED SILICA-BASED ELASTOMERIC NANOCOMPOSITES." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241175.

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L’industria degli pneumatici si prefigge di indagare possibili strategie sintetiche per ridurre l’impatto ambientale durante tutto il ciclo di vita dello pneumatico, attraverso l’uso di materiali sostenibili e lo sviluppo di tecniche innovative che riducano il consumo di energia e le emissioni di CO2. In questo contesto, questa progetto di dottorato è focalizzato sulla preparazione di nanocompositi eco-sostenibili attraverso l’uso di un approccio colloidale per aumentare la dispersione di filler idrofilici, in linea con i nuovi requisiti di sostenibilità delle politiche europee. L’approccio

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Wegener, Claudia B. "Natural dualities for varieties generated by lattice-structured algebras." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302397.

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4

Hashemi, Mohammad. "Lattice Boltzmann Simulation of Natural Convection During Dendritic Growth." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459444594.

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5

Hardter, Eric. "Modifying the Natural State of Nucleic Acids: Three-Dimensional DNA Lattices and Extended Deoxyribonucleosides." Thesis, Boston College, 2014. http://hdl.handle.net/2345/bc-ir:103610.

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Thesis advisor: Larry W. McLaughlin<br>By virtue of encoding and transferring hereditary information, nucleic acids effectively represent the blueprint for life as we know it. Given the biological relevance of this class of polymers, it comes as no surprise that scientists are constantly striving to reach a greater understanding of the innumerable genetic corridors contained within the human genome. This has led to the rational design and synthesis of numerous nucleoside analogues in an attempt to alter and subsequently control native nucleic acid structure and function. The first attempts at

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Craig, Andrew Philip Knott. "Canonical extensions of bounded lattices and natural duality for default bilattices." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:c7137abe-b076-42ad-9691-bddfca36967e.

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This thesis presents results concerning canonical extensions of bounded lattices and natural dualities for quasivarieties of default bilattices. Part I is dedicated to canonical extensions, while Part II focuses on natural duality for default bilattices. A canonical extension of a lattice-based algebra consists of a completion of the underlying lattice and extensions of the additional operations to the completion. Canonical extensions find rich application in providing an algebraic method for obtaining relational semantics for non-classical logics. Part I gives a new construction of the canoni

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BOCANEGRA, CIFUENTES JOHAN AUGUSTO. "Lattice Boltzmann Method: applications to thermal fluid dynamics and energy systems." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1060259.

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In many energy systems fluids play a fundamental role, and computational simulations are a valuable tool to study their complex dynamics. The Lattice Boltzmann Method (LBM) is a relatively new numerical method for computational fluid dynamics, but its applications can be extended to physical phenomena beyond fluid flows. This thesis presents applications of the LBM to thermal fluid dynamics and energy systems. Specific applications considered are: application to nuclear reactor engineering problems; thermal fluid dynamic behavior of a Natural Circulation Loop; nanoparticles gravitational

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Bray, Christina L., Robert G. Bryant, M. J. Cox, et al. "The proton Nuclear Magnetic Resonance spin-lattice relaxation rate of some hydrated synthetic and natural sands." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192008.

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The proton nuclear magnetic resonance (NMR) spin-lattice relaxation rate (R1) of hydrated sands is often used to determine porosity characteristics of near-surface aquifers using magnetic resonance sounding. Large variations in R1 have been reported in laboratory measurements on hydrated sands. To understand these variations, the R1 values of several fully hydrated sands were studied as a function of grain diameter (d) and magnetic field strength (BB0). We conclude the variations are a consequence of trace paramagnetic metals in the sand grains. R1 values from magnetic resonance sounding data

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Bray, Christina L., Robert G. Bryant, M. J. Cox, et al. "The proton Nuclear Magnetic Resonance spin-lattice relaxation rate of some hydrated synthetic and natural sands." Diffusion fundamentals 10 (2009) 8, S. 1-3, 2009. https://ul.qucosa.de/id/qucosa%3A14098.

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The proton nuclear magnetic resonance (NMR) spin-lattice relaxation rate (R1) of hydrated sands is often used to determine porosity characteristics of near-surface aquifers using magnetic resonance sounding. Large variations in R1 have been reported in laboratory measurements on hydrated sands. To understand these variations, the R1 values of several fully hydrated sands were studied as a function of grain diameter (d) and magnetic field strength (BB0). We conclude the variations are a consequence of trace paramagnetic metals in the sand grains. R1 values from magnetic resonance sounding data

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Rydén, Gabriel. "Ab initio lattice dynamics and Anharmonic effects in refractory Rock-salt structure TaN ceramic." Thesis, Linköpings universitet, Teoretisk Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-174208.

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Transition Metal Nitrides (TMN) are of considerable importance for the industry and have gathered a great deal of interest in the scientific community, mostly due to their unique physical and mechanical properties. To increase the understanding of what enables them to have such extraordinary properties requires the study of lattice dynamics and their phonon dispersion. In this thesis, the transition metal nitride, TaN, is studied extensively along with preliminary results for NbN. The primary tool for this investigation is simulations. Computational methods, such as ab initio Molecular Dynamic

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Xue, Boyu. "3D Printed Lattice Structure for Driveline Applications." Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299270.

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Lattice structures have received a lot of attention as cellular materials in recent years because of their outstanding properties, such as high strength-to-weight ratio, heat transfer, energy absorption, and capability of improving noise, vibration and harshness (NVH) behavior. This type of structure received a boost from additive manufacturing (AM) technology, which can fabricate geometries in practically any shape. Due to economic and environmental requirements, lightweight design is increasingly used in automobile and construction equipment applications. NVH behavior is a crucial issue for

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Shafei, Babak. "Reactive transport in natural porous media: contaminant sorption and pore-scale heterogeneity." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45785.

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Reactive Transport Models (RTMs) provide quantitative tools to analyze the interaction between transport and biogeochemical processes in subsurface environments such as aquatic sediments and groundwater flow. A tremendous amount of research has shown the role and impact of scaling behavior of the reactive systems which stems from geologic heterogeneity. Depending on the kinetics of the reactions, different types of formulations have been proposed to describe reactions in RTMs. We introduce a novel quantitative criteria on the range of validity of local equilibrium assumption (LEA) in aquatic s

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Ivanov, Angelov Mitko. "Sound Scattering by Lattices of Heated Wires." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/63275.

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[EN] The aim of this work is to demonstrate theoretically and experimentally how acoustic wave propagation can be controlled by temperature gradients. Starting with the simplest case of two hot wires in air the study extends over periodic structures known as Sonic Crystals (SCs). The Finite Elements Method (FEM) has been employed to perform numerical simulations in order to demonstrate collimation and focusing effect of acoustic waves in two-dimensional (2D) SC whose filling fraction is adjusted by temperature gradients. As a part of the research, Bragg reflection and Fabry-Perot type of acou

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Rehhali, Khaoula. "Simulations de la convection naturelle couplée au rayonnement surfacique par la méthode de Boltzmann sur réseau : cas des chauffages variable et discret." Electronic Thesis or Diss., Amiens, 2019. http://www.theses.fr/2019AMIE0001.

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Cette thèse s'inscrit dans le cadre d'une étude numérique visant à étudier les phénomènes de couplage de la convection naturelle et du rayonnement surfacique dans des cavités carrées dont les parois sont soumises à des chauffages discrets ou non-uniformes. En effet, la première étude réalisée s'intéresse à un problème de couplage convection-rayonnement dans une cavité carrée inclinée et remplie d'air, ayant d'un côté une paroi chauffée à une température constante et du côté opposé, une paroi chauffée linéairement. Les parois restantes sont considérées adiabatiques. Dans la seconde étude, la ca

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Beneitez, Miguel, and Johan Sundin. "Turbulent flow control via nature inspired surface modifications." Thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-206189.

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Many of the flows in nature are turbulent. To modify turbulent flows, nature serves itself with different types of coatings. Sharks have riblets-like structures on their skin, fishes have slime with polymers and the surface of the lotus flower has superhydrophobic properties. However many times these naturally occurring coatings also serve other purposes. Due to millions of years of adaption, there are anyway many reasons to be inspired by these. The present work is an investigation of nature inspired coatings with the aim of passive flow manipulations. The goal of the investigation has not be

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Ruzzi, Anna. "Stabilizzazione di succo di carota tramite trattamenti non termici e utilizzo di antimicrobici naturali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19384/.

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Nella mia tesi sono state valutate le potenzialità della combinazione tra diversi trattamenti non termici quali le alte pressioni di omogeneizzazione (HPH) alla pressione di 150MPa per 3 cicli, la fermentazione da parte del ceppo nisina produttore Lactococcus lactis subsp. lactis LBG2 per 7h a 30°C e l’addizione di un antimicrobico naturale come l’olio essenziale di timo alla concentrazione di 60ppm, per migliorare la shelf-life e la sicurezza microbiologica di succo di carota. I risultati sulla sicurezza microbiologica di succo di carota in presenza di microrganismi patogeni, ha indicato la

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Bartl, Eduard. "Mathematical foundations of graded knowledge spaces." Diss., Online access via UMI:, 2009.

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Thesis (Ph. D.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Systems Science and Industrial Engineering, 2009.<br>Includes bibliographical references.

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Maquignon, Nicolas. "Vers un modèle multiphases et multicomposants (MPMC) de type Lattice Boltzmann Method (LBM) pour la simulation dynamique d'un fluide cyogénique dans l'eau." Thesis, Littoral, 2015. http://www.theses.fr/2015DUNK0426/document.

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Au cours de cette thèse, un modèle LBM MPMC avec échanges thermiques est développé. Des tests d'assimilation de données et des mesures par flot optique sont réalisés en vue d'une validation. Le cadre d'application de cette thèse est celui du mélange d'un fluide cryogénique avec l'eau. Dans une première partie, un travail bibliographique rappelant l'équation de Boltzmann, ses diverses hypothèses et simplifications, ainsi que l'aspect algorithmique de la LBM sont exposés. Une comparaison entre opérateur de collision SRT et MRT est réalisée, et une simulation de phénomènes turbulents à différents

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BELLASSI, PAOLO. "Tecniche tassonomiche approfondite, metagenomica e valutazione della vitalità cellulare applicate allo studio di comunità batteriche del settore lattiero caseario." Doctoral thesis, Università Cattolica del Sacro Cuore, 2022. http://hdl.handle.net/10280/115771.

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Nella microbiologia lattiero-casearia, la ricerca è passata dallo studio del comportamento di singoli microrganismi in situazioni controllate allo studio di comunità batteriche complesse e alla loro interrelazione con il sistema circostante. In questa tesi sono stati studiati tre concetti chiave: lo studio della micro-diversità microbica, analizzando un genere specifico “Microbacterium” nel latte microfiltrato, il microbiota complesso del latte crudo e la vitalità cellulare nel siero-innesto naturale. I tre approcci utilizzati sono complementari per comprendere le dinamiche di processo e i fe

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Angleby, Linda. "Structural and electronic properties of bare and organosilane-functionalized ZnO nanopaticles." Thesis, Linköping University, Linköping University, Linköping University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58691.

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<p>A systematic study of trends in band gap and lattice energies for bare zinc oxide nanoparticles were performed by means of quantum chemical density functional theory (DFT) calculations and density of states (DOS) calculations. The geometry of the optimized structures and the appearance of their frontier orbitals were also studied. The particles studied varied in sizes from (ZnO)<sub>6</sub> up to (ZnO)<sub>192</sub>.The functionalization of bare and hydroxylated ZnO surfaces with MPTMS was studied with emphasis on the adsorption energies for adsorption to different surfaces and the effects

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Tari, Kévin. "Automorphismes des variétés de Kummer généralisées." Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2301/document.

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Dans ce travail, nous classifions les automorphismes non-symplectiques des variétés équivalentes par déformations à des variétés de Kummer généralisées de dimension 4, ayant une action d'ordre premier sur le réseau de Beauville-Bogomolov. Dans un premier temps, nous donnons les lieux fixes des automorphismes naturels de cette forme. Par la suite, nous développons des outils sur les réseaux en vue de les appliquer à nos variétés. Une étude réticulaire des tores complexes de dimension 2 permet de mieux comprendre les automorphismes naturels sur les variétés de type Kummer. Nous classifions final

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Pitou, Cynthia. "Extraction d'informations textuelles au sein de documents numérisés : cas des factures." Thesis, La Réunion, 2017. http://www.theses.fr/2017LARE0015.

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Le traitement automatique de documents consiste en la transformation dans un format compréhensible par un système informatique de données présentes au sein de documents et compréhensibles par l'Homme. L'analyse de document et la compréhension de documents sont les deux phases du processus de traitement automatique de documents. Étant donnée une image de document constituée de mots, de lignes et d'objets graphiques tels que des logos, l'analyse de documents consiste à extraire et isoler les mots, les lignes et les objets, puis à les regrouper au sein de blocs. Les différents blocs ainsi formés

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23

Guerra, João Carlos Carneiro. "Magneto-Optical Response of 2- Dimensional Lattices." Dissertação, 2018. https://hdl.handle.net/10216/118781.

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Silva, Daniel José da. "Lattice location of transition metals in silicon by means of emission channeling." Tese, 2014. https://repositorio-aberto.up.pt/handle/10216/100891.

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Guerra, João Carlos Carneiro. "Magneto-Optical Response of 2- Dimensional Lattices." Master's thesis, 2018. https://hdl.handle.net/10216/118781.

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Gomes, Mariana Melo Nogueira Rosa. "Polar properties, phase sequence and lattice dynamics of K0.5Na0.5NbO3 ceramics prepared through different sintering methods." Dissertação, 2019. https://hdl.handle.net/10216/123594.

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Silva, Daniel José da. "Lattice location of transition metals in silicon by means of emission channeling." Doctoral thesis, 2014. https://repositorio-aberto.up.pt/handle/10216/100891.

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Gomes, Mariana Melo Nogueira Rosa. "Polar properties, phase sequence and lattice dynamics of K0.5Na0.5NbO3 ceramics prepared through different sintering methods." Master's thesis, 2019. https://hdl.handle.net/10216/123594.

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Barbosa, Marcelo Baptista. "Electronic structure, lattice location and stability of dopants in wide band gap semiconductors." Doctoral thesis, 2019. https://hdl.handle.net/10216/119210.

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Barbosa, Marcelo Baptista. "Electronic structure, lattice location and stability of dopants in wide band gap semiconductors." Tese, 2019. https://hdl.handle.net/10216/119210.

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Tsai, Yi-yuan, and 蔡益元. "Code Lattices and Natural Code Evolution Paths." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/3aqf2u.

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碩士<br>中原大學<br>資訊工程研究所<br>92<br>For students of computer science, programming is an indispensable knowledge and technical ability. However, during the course of learning programming, the learners are often faced with hesitations, setbacks, and frustrations. Having written a piece of code after spending a lot of time and effort, a learner may only find that there are many mistakes (bugs) in the code. Though there may be a strong desire on the part of the learner to try to correct the code, he/she may only “wonder around”, not knowing where to start and what to do. The result is often that th

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Chun-KaiChang and 張駿愷. "Lattice Boltzmann simulation of nanofluid natural/mixed convection heat transfer." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/28913572604744787599.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>100<br>In the present study, mathematical modeling is performed to simulate two-dimensional incompressible natural and mix convection of nanofluids in a vertical square enclosure and channel using the lattice Boltzmann method(LBM).Consider the effects of different concentration of nanofluids (0%, 2%, 4%), Rayleight number and Richardson number to averaged Nusselt number, and Consider the effects of putting a rectangle hole in vertical channel with different ratio of height and length to Nusselt number, averaged Nusselt number, and temperature field. The inlet velo

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Rodrigues, Pedro Miguel da Rocha. "Functional lattice instabilities in naturally layered perovskites: from local probe studies to macroscopic cross-coupling effects." Doctoral thesis, 2021. https://hdl.handle.net/10216/139585.

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Huang, Nai-Zhu, and 黃迺筑. "The Natural Measure of Symbolic Dynamical Systems in the Two-Dimensional Lattice Model." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/hmmzbw.

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碩士<br>國立交通大學<br>應用數學系所<br>107<br>This thesis investigates the natural measure of a symbolic dynamical system in two-dimensional lattice model. For a two-dimensional shift of finite type has irreducible ordering matrix H_2, we provided a method for the natural measure of two-dimensional lattice model. And derive all the one-dimensional model into two-dimension. Eventually apply this method to have the exact value of natural measure of totally symmetric system in the two-dimension.

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Chen, Yi-Hsin, and 陳逸昕. "Lattice Boltzmann method for simulating the macroscopic and mesoscopic natural convection flows inside a rectangular cavity." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/53906405335715367280.

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碩士<br>國立成功大學<br>工程科學系碩博士班<br>95<br>Natural convection inside a closed cavity is one of the interesting investigations in many scientific and industrial applications. Many numerical methods have been applied to analyze this problem, including the lattice Boltzmann method (LBM), which has emerged as one of the most powerful computational fluid dynamics (CFD) methods in recent years. Using a simple LB model with the Boussinesq approximation, this study investigates the 2D natural convection problem inside a rectangular cavity at different reference Rayleigh numbers, Knudsen numbers, and aspect ra

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Hsu, Hao, and 徐豪. "A study on the topological nature of Landau levels in a 2D muffin-tin potential lattice." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/84108410755641157467.

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碩士<br>國立交通大學<br>電子物理系所<br>103<br>In this work we consider the topological features in a square lattice on a 2DEG under the action of a normal magnetic field. Specifically, the magnetic flux per unit cell is fixed at one half of a flux quanta. Exact numerical diagonalization of the full Hamiltonian is performed to obtain energy band |N,k> of the N-th Landau level (LL).This calculation is facilitated by a TKNN-type (PRL 49,405(1982)) basis wavefunctions |n,k>, where the magnetic translation symmetry is built-in and the n-th eigenstate of a simple harmonic oscillator is used. As the lattice poten

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Ghosh, Soumi. "Non-ergodicity in Interacting Quasiperiodic Systems and Disordered Fock Lattice Models." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5157.

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In this thesis, we study different aspects of many body localization in closed quantum systems. Many body localized systems are isolated interacting quantum systems that fail to thermalize on their own (non-ergodic) and thus violates the eigenstate thermalization hypothesis (ETH), which guarantees thermalization in quantum systems. These systems are known to have area law entanglement entropy even at high energy densities and have been argued to have emergent conservation laws, which prevent thermalization. The presence of thermal-MBL transitions has been confirmed in the interacting disordere

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Mohanta, Zinia. "Engineering Graphene Oxide Surface Chemistry and Investigating Its Effect on The Physicochemical and Biological Properties." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/4902.

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In the current study, systematic tuning of oxidation degree of GO has been explored and a two-step methodology for engineering GO surface chemistry was successfully developed. The investigation of the effects of oxidation degree of GO on its physicochemical properties such as nuclear relaxivity and magnetic resonance imaging (MRI) contrast enhancement and biological properties such as cytotoxicity, drug release kinetics and biomolecule conjugation efficacy were undertaken. Defect density in the graphite lattice increases with ball-milling time and these induced defects increase the reactivity

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Monteiro, Rafael Torrado. "Post-quantum cryptography: lattice-based cryptography and analysis of NTRU public-key cryptosystem." Master's thesis, 2016. http://hdl.handle.net/10451/28303.

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Tese de mestrado em Matemática, apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2016<br>Em 1994, Peter Shor desenvolveu um algoritmo quântico para a fatorização de inteiros e para o problema do logaritmo discreto, fazendo de ambos RSA e ECC (Elliptic Curve Cryptography) facilmente quebráveis por computadores quânticos. Como se acredita que computadores quânticos irão fisicamente existir nos próximos poucos anos, quase toda a informação encriptada deixará de estar segura, e o impacto na vida prática das pessoas será no mínimo devastador. Aspetos como a comunicação entre

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Yadav, Ravindra Kumar. "Study of room temperature coupling of colloidal quantum dots to plasmonic arrays and metamaterials: from single quantum dot to quantum dot assemblies." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5086.

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There is much current interest in coupling emitters, such as fluorescing dye molecules and semiconductor quantum dots to plasmonic systems. Controlling the electromagnetic interactions between quantum emitters and the plasmonic system in the weak, intermediate, and strong coupling regimes has focused on an intense research effort in recent years. The weak and intermediate coupling regimes are associated with enhancement of the emission and absorption rates of nearby resonant emitters, while the strong coupling regime allows for coherent energy transfer between emitters and plasmonic syste

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Abreu, Maria Zita Fiqueli de. "Esquemas de assinatura digital Lattice-based e experimentação de certificados híbridos com criptografia pós-quântica." Master's thesis, 2020. http://hdl.handle.net/1822/73679.

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Dissertação de mestrado em Matemática e Computação<br>Os algoritmos criptográficos pós-quânticos têm como premissa de segurança a dificuldade na resolução de problemas matemáticos que se conjecturam difíceis na computação quântica. O interesse em implantar esses algoritmos tem vindo a crescer por forma a que a informação esteja protegida contra ataques quânticos no futuro. O National Institute of Standards and Technology (NIST) tem, atualmente, aberto um concurso para a seleção de algoritmos criptográficos pós-quânticos [1]. Nesta dissertação estuda-se dois desses algoritmos, mais precis

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Janani, B. "Investigations on structural, optical and electrical properties of lattice matching CdZnTe & HgCdTe colloidal quantum dot systems for possible core-shell structures in optoelectronic devices." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5194.

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In this work, alloyed II-VI group CdZnTe, HgCdTe colloidal quantum dots (QDs) have been synthesised and their optical, material, electrical properties are studied for optoelectronic applications. The bandgap of the alloyed QDs could be tuned by varying the size as well as composition. The bandgap of CdZnTe QDs correspond to the visible range 420-600 nm, whereas that of HgCdTe QDs correspond to mid-infrared range 2200-5000 nm. Colloidal CdTe and Cdx Zn1-x Te QDs by synthesized by reflux method with N-acetyl l cysteine as capping agent in aqueous medium. UV-Vis absorption spectra show the exci

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Thakkar, Rishabh. "Mesonic screening mass at zero and finite chemical potential." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5980.

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The finite temperature analysis of QCD is challenging since perturbation theory is not applicable in that regime. A non-perturbative method like lattice QCD is thus required to obtain an estimate of the necessary observables. In this Ph.D. thesis, we study the symmetries of the chiral phase transition and its transition temperature. This is undertaken by measuring the screening masses of those mesons that rotate amongst themselves under the symmetries. Firstly, we discuss the regime of zero chemical potential where it is easy to obtain the correlators using which we calculate the meson scre

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Pal, Srishti. "Spectroscopic and Diffraction Signatures of Quantum Spin Liquids, Skyrmion Lattices and Transition Metal Dichalcogenides at Low Temperatures and High Pressures." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5727.

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This thesis presents experimental as well as theoretical studies on several contemporary systems like quantum spin liquids (QSLs), skyrmion lattices, and transition metal dichalcogenides (TMDs) under extreme conditions like low temperature (down to 4K) and ultra high pressures (up to 26 GPa). Temperature-dependent Raman studies are carried out to investigate Raman signatures of Kitaev quantum spin liquid (QSL) state of Cu2IrO3 and Ag3LiIr2O6 and orbital ordering in Heisenberg quantum magnet Ca10Cr7O28. High-pressure studies are performed on Kitaev QSL candidates -RuCl3, Cu2IrO3, kagomé

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Seshadri, Ranjani. "Living on the Edge A Study of Boundary Modes In Two-dimensional Topological Systems." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5384.

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In the last few decades an enormous amount of research has been carried out on some novel phases of matter called topological phases which are beyond the paradigm of Landau’s theory of symmetry breaking. One of the earliest breakthroughs in this field was the discovery of the quantum Hall effect. A topological system has some properties which are immune to slight perturbations which obey the symmetries of the unperturbed system. Topological systems can be characterised by means of a topological invariant, such as the Chern number in two-dimensional systems. Topological phases can be foun

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Hossain, Akmal. "Investigation of strongly correlated paramagnetic state at sub-Kelvin regime for S ≥ 1/2 systems: Role of disorder and dimensionality." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6061.

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A magnetic system usually orders ferro- or anti-ferromagnetically at temperatures comparable to interaction strength between the spins. Moreover, an interacting spin system tends to order with the increase of dimensionality of the magnetic lattice, as determined by the spin-spin correlation along various directions. However, there are certain lattice types where such orderings are strongly suppressed. A prototypical example is the Ising spin-1/2 on a triangular lattice with a nearest neighbour antiferromagnetic interaction where the triangular arrangement results in competing interaction

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Debnath, Rahul. "Study on optical and electrical transport properties of twisted bilayer transition metal dichalcogenides." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5921.

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Van der Waals (vdW) heterostructures, where dissimilar atomically thin vdW crystals are vertically assembled, have initiated a new paradigm to create flexible multifunctional devices. Despite the weak nature of vdW interactions, unusually strong interlayer coupling and hybridization in these heterostructures lead to novel physical phenomena ranging from interfacial stress fields to modification of electronic band structure. In twisted van der Waals heterostructures (vdWHs), the angular mismatch between two similar lattices generates a large-scale interference pattern, known as the moiré patter

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