Exploració per tema "Cristalls"
Ara es mostren els items 1-20 de 28
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Acoustically penetrable sonic crystals based on fluid-like scatterers
(2015-01-21)
Article
Accés obertWe propose a periodic structure that behaves as a fluid-fluid composite for sound waves, where the building blocks are clusters of rigid scatterers. Such building-blocks are penetrable for acoustic waves, and their properties ... -
Ag2ZnSnS4 Nanocrystals Expand the Availability of RoHS Compliant Colloidal Quantum Dots
(ACS, 2020)
Article
Accés obertThe demonstration of the quantum confinement effect in colloidal quantum dots (QDs) has been extensively studied and exploited mainly in Pb and Cd chalcogenide systems. There has been an urgent need recently for the ... -
Beam focalization in reflection from flat dielectric subwavelength gratings
(2014-10-15)
Article
Accés restringit per política de l'editorialWe experimentally demonstrate the recently predicted effect of near-field focusing for light beams from flat dielectric subwavelength gratings (SWGs). This SWGs were designed for visible light 532 nm and fabricated by ... -
Crystal structure of polymorph II and the pressure-temperature phase diagram of the dimorphic anesthetic butamben
(American Chemical Society, 2021-11-18)
Article
Accés obertThe crystal structure of the low-temperature form II of butamben has been solved in a P21/c space group very similar to that of form I. Form II possesses virtually the same packing as that of the high-temperature form I, ... -
Crystal structures and phase relationships of 2 polymorphs of 1,4-Diazabicyclo[3.2.2]nonane-4-Carboxylic Acid 4-Bromophenyl Ester Fumarate, A selective a-7 nicotinic receptor partial agonist
(2016-01)
Article
Accés obertTwo polymorphs of the 1:1 fumarate salt of 1,4-diazabicyclo[3.2.2]nonane-4-carboxylic acid 4-bromophenyl ester, developed for the treatment of cognitive symptoms of schizophrenia and Alzheimer disease, have been characterized. ... -
Crystalline tetrazepam as a case study on the volume change on melting of molecular organic compounds
(2021-01-25)
Article
Accés obertThe volume change on melting is a rarely studied quantity and it is not well understood even if it must reflect the changes in interaction between the solid and the liquid state. It is part of the solid-state information ... -
Dynamical tuning of the thermal conductivity via magnetophononic effects
(American Physical Society (APS), 2022-03-01)
Article
Accés obertStrategies for tuning the thermal conductivity of crystals by means of external fields are rare. Here, we predict the existence of large magnetophononic effects in materials that undergo antiferromagnetic (AFM) ¿ ferromagnetic ... -
Estudio de la viabilidad sobre el uso de los modelos de plasticidad cristalina en la modelización de la deformación plástica de cristales hexagonales.
(Universitat Politècnica de Catalunya, 2009-02)
Projecte/Treball Final de Carrera
Accés obertEste proyecto esta una primera enfoque de la viabilidad sobre el uso de los modelos de plasticidad cristalina en la modelizacion de la deformacion plástica de cristales hexagonales. El estudio pretende encontrar opciones ... -
Fingerprints of the crossing of the Frenkel and melting line on the properties of high-pressure supercritical water
(2022-08-25)
Article
Accés obertUsing molecular dynamics simulations in combination with the two-phase thermodynamic model, we reveal novel characteristic fingerprints of the crossing of the Frenkel and melting line on the properties of high-pressure ... -
Geometrically necessary dislocations on plastic deformation of polycrystalline TRIP steel
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-06-01)
Article
Accés obertIn this study, the main deformation behavior in terms of geometrically necessary dislocations (GND) was investigated on a transformation induced plasticity (TRIP) stainless steel by using sharp indentation at nanometric ... -
Glassy Anomalies in the Low-Temperature Thermal Properties of a Minimally Disordered Crystalline Solid
(2017-11-21)
Article
Accés obertThe low-temperature thermal and transport properties of an unusual kind of crystal exhibiting minimal molecular positional and tilting disorder have been measured. The material, namely, low-dimensional, highly anisotropic ... -
Inter-enantiomer conversion dynamics and Johari–Goldstein relaxation of benzophenones
(Nature, 2021-10-12)
Article
Accés obertWe employ temperature- and pressure-dependent dielectric spectroscopy, as well as differential scanning calorimetry, to characterize benzophenone and the singly-substituted ortho-bromobenzophenone derivative in the liquid ... -
Low-Temperature Heat Capacity Anomalies in Ordered and Disordered Phases of Normal and Deuterated Thiophene
(2021-03-04)
Article
Accés obertWe measured the specific heat Cp of normal (C4H4S) and deuterated (C4D4S) thiophene in the temperature interval of 1 = T, K = 25. C4H4S exhibits a metastable phase II2 and a stable phase V, both with frozen orientational ... -
Nonspreading Light Pulses in Photonic Crystals
(2005-05)
Report de recerca
Accés obertWe investigate propagation of light pulses in photonic crystals in the vicinity of the zero-diffraction point. We show that Gaussian pulses due to nonzero width of their spectrum spread weakly in space and time during the ... -
On the different faces of the supercritical phase of water at a near-critical temperature: pressure-induced structural transitions ranging from a gaslike fluid to a plastic crystal polymorph
(American Chemical Society, 2021-09-07)
Article
Accés obertThe present study reports a systematic analysis of a wide variety of structural, thermodynamic, and dynamic properties of supercritical water along the near-critical isotherm of T = 1.03Tc and up to extreme pressures, using ... -
Ordered and disordered solvates of C 60 and CBrCl 2 H
(2019-01-01)
Article
Accés obertThe formation of co-crystals is often unexpected; however, the Buckminster fullerene, for which many solvates are known,is an excellent system to study this tendency. In the present paper, C60 and CBrCl2H co-crystals have ... -
Physical properties of organic fullerene cocrystals
(2018-01-04)
Article
Accés obert -
Polymorphism of 1,3-X-adamantanes (X = Br, OH, CH3) and the crystal plastic phase formation ability
(2020-02-21)
Article
Accés obertThe polymorphism of 1,3-dimethyladamantane (13DMA), 1,3-adamantanediol (13DOHA) and 1,3-dibromoadamantane (13DBrA) has been studied by X-ray powder diffraction, density measurements and differential scanning calorimetry ... -
Preferential incorporation of azelaic acid units into the crystalline phase of the copoly(alkylene dicarboxylate) derived from 1,9-nonanediol and an equimolar mixture of pimelic and azelaic acids
(2015-09-01)
Article
Accés obertThe crystalline structure of two biodegradable odd-odd polyesters (i.e., poly(nonamethylene pimelate) (PES 9,7) and poly(nonamethylene azelate) (PES 9,9)) was investigated by means of electron and X-ray diffraction of ... -
Reconfiguració de robots cristal·lins
(Universitat Politècnica de Catalunya, 2013-07)
Treball Final de Grau
Accés obertL'objectiu d'aquest treball consisteix en crear i implementar un algorisme de reconfiguració per a un tipus de robots encara en fase d'experimentació anomenats modulars. Aquests robots estan formats per un conjunts de ...