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showing 10 items of 8538 documents
Efficient Time Integration of Maxwell's Equations with Generalized Finite Differences
2015
We consider the computationally efficient time integration of Maxwell’s equations using discrete exterior calculus (DEC) as the computational framework. With the theory of DEC, we associate the degrees of freedom of the electric and magnetic fields with primal and dual mesh structures, respectively. We concentrate on mesh constructions that imitate the geometry of the close packing in crystal lattices that is typical of elemental metals and intermetallic compounds. This class of computational grids has not been used previously in electromagnetics. For the simulation of wave propagation driven by time-harmonic source terms, we provide an optimized Hodge operator and a novel time discretizati…
Curvelet-based method for orientation estimation of particles from optical images
2014
A method based on the curvelet transform is introduced to estimate the orientation distribution from two-dimensional images of small anisotropic particles. Orientation of fibers in paper is considered as a particular application of the method. Theoretical aspects of the suitability of this method are discussed and its efficiency is demonstrated with simulated and real images of fibrous systems. Comparison is made with two traditionally used methods of orientation analysis, and the new curvelet-based method is shown to perform better than these tradi- tional methods. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of th…
Design of a Cleaning Program for a PV Plant Based on Analysis of Energy Losses
2015
Solar photovoltaic (PV) energy has grown significantly over the past few years. However, despite the increase in installed capacity, this energy source still raises important concerns related to the variability of power production. The short-term effects such as cloud shadowing and supply interruptions, as well as long-term effects such as dust accumulation, seasonal variation, and ageing of PV modules, can cause variability of power production. Therefore, the analysis of all the variability sources in order to provide statistically consistent power production data is an important challenge. This study presents a methodology to analyze data from a PV plant in order to have an independent ev…
Evidence of Weak Halogen Bonding: New Insights on Itraconazole and its Succinic Acid Cocrystal
2012
Exact knowledge of the crystal structure of drugs and lead compounds plays a significant role in the fields of crystal engineering, docking, computational modeling (drug–receptor interactions), and rational design of potent drugs in pharmaceutical chemistry. The succinic acid cocrystal of the systemic antifungal drug, itraconazole, reported by Remenar et al. (J. Am. Chem. Soc.2003, 125, 8456–8457) (CSD: IKEQEU), represents one of the classical examples displaying a molecular fitting mechanism in the solid state. In this work, we disclose the X-ray single-crystal structure of the cis-itraconazole–succinic acid (2:1) cocrystal and found that it differs slightly from the previously reported st…
SERS detection of cell surface and intracellular components of microorganisms using nano-aggregated Ag substrate
2016
Abstract The intracellular and cell surface composition and structural features of gram-positive and gram-negative bacteria were identified using near-infrared surface-enhanced Raman scattering (SERS). The structural differences of components that reside in the cell envelope are manifested by their SERS spectra, e.g. gram-negative vs. gram-positive. Silver particles were used as a SERS substrate by exploiting the existence of strong local electromagnetic fields (hot spots) within nanoscale aggregates of the particles. The aggregation of silver nanoparticles was induced by magnesium ions. These hot spots reduce the screening length of the double layer. The obtained SERS spectra showed excell…
Long-range spin accumulation from heat injection in mesoscopic superconductors with Zeeman splitting
2015
Under the terms of the Creative Commons Attribution License 3.0 (CC-BY).
Progettare per lo sviluppo della competenza negli alunni: organizzazione didattica e controllo dei risultati
2016
Per l’insegnante un problema cruciale è come organizzare, a partire da particolari requisiti e vincoli, esperienze di apprendimento che contribuiscano ad accrescere negli allievi la comprensione delle acquisizioni culturali, la capacità di risolvere problemi con senso critico e autonomia, l’attitudine a operare scelte consapevoli. L’obiettivo del contributo è indagare le condizioni in cui gli insegnanti pianificano e realizzano un intervento didattico, quali difficoltà incontrano nelle fasi di sviluppo dell’azione programmata, quali esiti conseguono da attività di insegnamento ben progettate e condotte. In primo luogo, è stato osservato il lavoro di organizzazione didattica di un gruppo di …
Cappero
2009
Il cappero appartiene alla famiglia delle Capparidaceae, sottofamiglia Ajugodeae Briq., trib. Rosmarinae Briq., genere Capparis Sp.:23 (1753). Il genere Capparis comprende circa 250 specie distribuite nella fascia tropicale e subtropicale del Vecchio e del Nuovo mondo. Nell’area del bacino del Mediterraneo la più diffusa risulta Capparis spinosa. In Italia è distribuita in maniera sporadica nelle zone costiere in prossimità di affioramenti rocciosi, scogliere, pendici e muri. Secondo gli autori Higton & Akeroyd (1993), le popolazioni siciliane vanno attribuite sia a Capparis spinosa subsp. spinosa var. canescens Cosson che a C. spinosa subsp. rupestris (Sm.) Nyman. La subsp. spinosa var. ca…
Age- and quality-dependent DNA methylation correlate with melanin-based coloration in a wild bird
2018
Abstract Secondary sexual trait expression can be influenced by fixed individual factors (such as genetic quality) as well as by dynamic factors (such as age and environmentally induced gene expression) that may be associated with variation in condition or quality. In particular, melanin‐based traits are known to relate to condition and there is a well‐characterized genetic pathway underpinning their expression. However, the mechanisms linking variable trait expression to genetic quality remain unclear. One plausible mechanism is that genetic quality could influence trait expression via differential methylation and differential gene expression. We therefore conducted a pilot study examining…
Kommunikation im fremdsprachlichen Klassenzimmer - ein Beispiel multimodaler Analyse
2017
Il testo presenta un analisi multimodale di alcune sequenze durante una lezione di tedesco svoltasi in un liceo linguistico nel Trentino-Alto Adige. Vengono focalizzati i diversi livelli di attenzioni degli apprendenti sia nell'interazione con l'insegnante sia nella comunicazioni tra discenti. L'analisi rivela determinate forme di schematizzazione e di routine dell'interazione in classe, nella comunicazione verbale e non verbale, che induce a una maggiore riflessione e un approccio più consapevole nell'ambito dell'insegnamento. Nach einer Auseinandersetzung mit dem Multimodalitätskonzept wird ein Verfahren vorgestellt, das sich im Rahmen der semiotisch orientierten multimodalen Diskursanaly…