Institution
Polytechnic University of Milan
Education•Milan, Italy•
About: Polytechnic University of Milan is a education organization based out in Milan, Italy. It is known for research contribution in the topics: Computer science & Finite element method. The organization has 18231 authors who have published 58416 publications receiving 1229711 citations. The organization is also known as: PoliMi & L-NESS.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this paper, the problem of representing noncausality between two sets of cointegrated variables is addressed by using the likelihood ratio tests for noncauseality, which are different depending on the distributions of the unit roots in the marginal subsystem and the autoregressive part of the conditional subsystem.
Abstract: This paper addresses the problem of representing noncausality between two sets of cointegrated variables. In this case, maximum likelihood estimates of the parameters may be derived based on Johansen's approach. Likelihood ratio tests for noncausality are derived, which are different depending on the distributions of the unit roots in the marginal subsystem and the autoregressive part of the conditional subsystem. These tests are chi-squared-distributed. A Monte Carlo experiment illustrates t he advantages of the proposed approach when compared to the usual approach based on VAR's in levels. Copyright 1992 by Blackwell Publishing Ltd
217 citations
••
TL;DR: In this article, a semi-detailed kinetic scheme for n-heptane oxidation is presented, where both the low and high temperature primary mechanisms are conveniently reduced to a lumped kinetic model involving only a limited number of intermediate steps.
217 citations
••
TL;DR: In this paper, the exciton size and diffusion length of single-walled carbon nanotubes were determined using sub-15'fs near-infrared pulses to measure the nascent bleach of the lowest exciton resonance.
Abstract: Knowledge of excited-state dynamics in carbon nanotubes is determinant for their prospective use in optoelectronic applications. It is known that primary photoexcitations are quasi-one-dimensional excitons, the electron–hole correlation length (‘exciton size’) of which corresponds to a finite volume in the phase space. This volume can be directly measured by nonlinear spectroscopy provided the time resolution is short enough for probing before population relaxation. Here, we report on the experimental determination of exciton size and mobility in (6, 5) carbon nanotubes. The samples are sodium cholate suspensions of nanotubes (produced by the CoMoCat method) obtained by density-gradient ultracentrifugation. By using sub-15 fs near-infrared pulses to measure the nascent bleach of the lowest exciton resonance, we estimate the exciton size to be 2.0±0.7 nm. Exciton–exciton annihilation in our samples is found to be rather inefficient so that many excitons can coexist on a single nanotube. An accurate determination of the size and diffusion length of excitons generated with single-walled nanotubes supports the Wannier–Mott picture of their behaviour, and improves the outlook for the use of nanotubes in optoelectronics and biosensing applications.
217 citations
••
TL;DR: In this paper, the effectiveness of three organic commercial inhibitors in preventing carbon steel chlorides induced corrosion in concrete is investigated, since there is not yet a clear knowledge on the real effectiveness of these products.
217 citations
••
TL;DR: In this paper, it was shown that fluorine can form halogen-bonded complexes in both the gaseous and the solid phases, and that it can interact with Lewis bases.
Abstract: Because of the anisotropies of their electronic charge distributions, many covalently bound halogen atoms have regions of positive electrostatic potential (positive σ-holes) on their outer portions. Through these, the halogens can interact attractively with negative sites. It has sometimes been questioned whether fluorine, the least polarizable halogen, can form halogen bonds, especially in solids. Here we present computational and crystallographic evidence demonstrating that it can indeed do so, in both the gaseous and the solid phases. We show computationally, through a series of examples, that fluorine can have positive σ-holes when linked to strongly electron-withdrawing residues and that it can interact with Lewis bases to form gas phase halogen-bonded complexes. Through statistical analyses of data from the Cambridge Structural Database, we demonstrate that such fluorines do also halogen bond in the solid state, and we show several specific cases of this.
217 citations
Authors
Showing all 18743 results
Name | H-index | Papers | Citations |
---|---|---|---|
Alex J. Barker | 132 | 1273 | 84746 |
Pierluigi Zotto | 128 | 1197 | 78259 |
Andrea C. Ferrari | 126 | 636 | 124533 |
Marco Dorigo | 105 | 657 | 91418 |
Marcello Giroletti | 103 | 558 | 41565 |
Luciano Gattinoni | 103 | 610 | 48055 |
Luca Benini | 101 | 1453 | 47862 |
Alberto Sangiovanni-Vincentelli | 99 | 934 | 45201 |
Surendra P. Shah | 99 | 710 | 32832 |
X. Sunney Xie | 98 | 225 | 44104 |
Peter Nijkamp | 97 | 2407 | 50826 |
Nicola Neri | 92 | 1122 | 41986 |
Ursula Keller | 92 | 934 | 33229 |
A. Rizzi | 91 | 653 | 40038 |
Martin J. Blunt | 89 | 485 | 29225 |