Search results for "Symbol"
showing 10 items of 7541 documents
Symbolisme phonétique et transmodalité
2019
Numerical methods for a nonlinear impact model: A comparative study with closed-form corrections
2011
A physically based impact model-already known and exploited in the field of sound synthesis-is studied using both analytical tools and numerical simulations. It is shown that the Hamiltonian of a physical system composed of a mass impacting on a wall can be expressed analytically as a function of the mass velocity during contact. Moreover, an efficient and accurate approximation for the mass outbound velocity is presented, which allows to estimate the Hamiltonian at the end of the contact. Analytical results are then compared to numerical simulations obtained by discretizing the system with several numerical methods. It is shown that, for some regions of the parameter space, the trajectorie…
Joint second-order parameter estimation for spatio-temporal log-Gaussian Cox processes
2018
We propose a new fitting method to estimate the set of second-order parameters for the class of homogeneous spatio-temporal log-Gaussian Cox point processes. With simulations, we show that the proposed minimum contrast procedure, based on the spatio-temporal pair correlation function, provides reliable estimates and we compare the results with the current available methods. Moreover, the proposed method can be used in the case of both separable and non-separable parametric specifications of the correlation function of the underlying Gaussian Random Field. We describe earthquake sequences comparing several Cox model specifications.
Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites
2013
Nanodielectrics, a 21st-century phenomena, is envisioned to be the answer for material challenges in progressive high-voltage technology. It is well known that the proper dispersion of nanoparticles plays a key role in improving the dielectric properties of a material, but to understand where changes in the properties of a material originate, it is also essential to reveal the multiscale structure of the material. In this study, the dielectric permittivity, breakdown strength, and structure of nano calcium carbonate (nano-CaCO3)/polypropylene composites with 1.8-8.1 wt % doping were characterized systematically. The combined results from transmission electron microscopy, Raman microscopy, a…
Crystal structure and Hirshfeld surface analysis of [N(CH3)4][2,2′-Fe(1,7-closo-C2B9H11)2]
2017
Abstract This work investigates the meta -ferrabis(dicarbollide) anion that was isolated as salt of tetramethylammonium. The structure of the obtained crystal consisted of discrete [2,2′-Fe(1,7- closo -C 2 B 9 H 11 ) 2 ] − anions and disordered [N(CH 3 ) 4 ] + cations. The anion had a considerable chemical stability ensured by ionic and Van der Waals interactions. Thus, Hirshfeld surfaces and fingerprint plot were used to visualize, explore, and quantify intermolecular interactions in the crystal lattice of the title compound. This investigation proved that close contacts were dominated by H⋯H interactions.
Fanonian analysis of racism and postcolonial structures of othering
2023
The paper explores how boundaries affect the search for identity in the context of racism and colonialism. Colonized individuals often experience a sense of alienation and inferiority caused by the limitations imposed by colonial power structures, leading to a quest for personal identity. However, the binary division between the colonizer and colonized affects everyone involved, making searching for personal identity more complex and reinforcing systemic racism. The first section of the article examines how race, a socially constructed concept, plays a crucial role in defining the difference between oneself and others, impo-sing structures of othering based on Fanonian analysis. The second …
La costruzione sociale dei suicidi
2020
Il saggio presenta le principali prospettive di ricerca costruzioniste sul tema del suicidio. Le sociologie costruzioniste – e, in particolare, interazionismo simbolico, etnometodologia, fenomenologia – hanno operato la resa dei conti con gli approcci positivisti. I saggi analizzati offrono una summa di grande interesse dei modi originali con cui le sociologie costruzioniste hanno re-immaginato lo studio dei suicidi andando oltre la rigidità dello schema “cause e cure” degli approcci positivisti ed arricchendo di sfumature la nostra comprensione del fenomeno. Di fronte a un panorama sociologico per cui lo studio del suicidio è ancora sinonimo di analisi durkheimiana e di dati statistici, i …
Spherical Top Theory and Molecular Spectra
2011
In this article, we present an overview of the present state of the art of the theory of high-resolution spherical-top spectra in the framework of the effective Hamiltonian approach. We describe the specific features of this class of molecules to explain the basic concepts of the theoretical methods used for the analysis (line positions and intensities) and the simulation of absorption (including pure rotation) and Raman spectra of such species. The non conventional formalism that we use is essentially based on irreducible tensor methods and is especially adapted to computational treatments and global analyses of complex interacting band systems. We give examples concerning mainly methane (…
Topological polarization, dual invariants, and surface flat band in crystalline insulators
2020
We describe a three-dimensional crystalline topological insulator (TI) phase of matter that exhibits spontaneous polarization. This polarization results from the presence of (approximately) flat bands on the surface of such TIs. These flat bands are a consequence of the bulk-boundary correspondence of polarized topological media, and contrary to related nodal line semimetal phases also containing surface flat bands, they span the entire surface Brillouin zone. We also present an example Hamiltonian exhibiting a Lifshitz transition from the nodal line phase to the TI phase with polarization. Utilizing elasticity tetrads, we show a complete classification of 3D crystalline TI phases and invar…
Siunauskappeli arkkitehtuurina ja tilakokemuksena
2011
Tutkielmassa tarkastellaan siunauskappelia arkkitehtuurina ja henkilön tilakokemusta siunauskappelissa. Tutkimuksen tarkoituksena on ollut selvittää, millaiseksi tuo kokemus muodostuu, ja miksi siunauskappeli on henkilölle merkityksellinen. Tutkielmassa tuodaan esille myös kuolemakäsityksen heijastuminen arkkitehtuurin symboliikkaan ja tilakokemukseen. Tutkimuksessa lähestytään siunauskappelia ennen kaikkea sen käyttäjän näkökulmasta. Lähtökohtana tutkimukselle on ollut tilan teoria, ja tutkimusasenne on ollut fenomenologinen. Fenomenologia suuntautuu ihmisen elämismaailmaan, ja sen avulla voidaan lähestyä henkilöiden kokemuksia ja niiden sisältämiä merkityksiä. Tutkielmassa esitellään nelj…