523 research outputs found
Fly ye moments! [music] /
No full textFor voice and piano.; Caption title.; Engraved.; "Inscribed to Mrs Bazett Doveton by Mrs Mott" --Caption.; Also available online http://nla.gov.au/nla.mus-an10696669; Library's copy stamped: From W.T. Tyrers, 83 George Street, Sydney
Assessment of Trentingrana cheese ageing by proton transfer reaction-mass spectrometry and chemometrics
No full textProton transfer reaction-mass spectrometry (PTR-MS) data have been analysed by chemometric techniques to monitor cheese ageing by means of on-line direct head-space gas analysis. Twenty cheese loaves of Trentingrana, a trademarked cheese produced in northern Italy, of different origin and ripening degree, were sampled over the whole Trentingrana production area. An increase of the spectral intensity with ripening has been observed for most of the PTR-MS peaks and a univariate analysis identified 16 mass peaks that were significantly different for ripened and young cheeses, respectively. Moreover, the usefulness of different discriminant analyses and class modelling techniques have been investigated. Discriminant Partial Least Squares analysis, while indicating average behaviour and possible outliers, was not able to correctly classify all samples. Soft class modelling performed better and allowed a 100% correct classification. Partial least square calibration predicted the ageing time of each loaf with reasonable accuracy with a maximum cross-validation error of 3.5 months. (c) 2006 Elsevier Ltd. All rights reserved
Constructing the Cyberterrorist: Critical Reflections on the UK Case
No full textThis book maps and analyses the official British construction of the threat of cyberterrorism. By using interpretive discourse analysis, this book identifies ‘strands’ from a corpus of policy documents, statements and speeches from UK ministers, MPs and peers, between 12 May 2010 and 24 June 2016. The book examines how the threat of cyberterrorism was constructed in the UK, and what this securitisation has made possible. The author makes novel contributions to the Copenhagen School’s ‘securitisation theory’ framework by outlining a ‘tiered’ rather than monolithic audience system; refining the ‘temporal’ and ‘spatial’ conditioning of a securitisation with reference to the distinctive characteristics of cyberterrorism; and, lastly, by detailing the way in which popular fiction can be ascribed agency to ‘fill in’ an absence of ‘cyberterrorism’ case studies. He also argues that the UK government’s classification of cyberterrorism as a ‘Tier One’ threat created a central strand upon which a discursive securitisation was established
Effects of dissipation on the superfluid–Mott-insulator transition of photons
No full textWe investigate the superfluid–Mott-insulator transition of a two-dimensional photon gas in a dye-filled optical microcavity and in the presence of a periodic potential. We show that in the random-phase approximation the effects of the dye molecules, which generally lead to dissipation in the photonic system, can be captured by two dimensionless parameters that only depend on dye-specific properties. Within the mean-field approximation, we demonstrate that one of these parameters decreases the size of the Mott lobes in the phase diagram. By considering also Gaussian fluctuations, we show that the coupling with the dye molecules results in a finite lifetime of the quasiparticle and quasihole excitations in the Mott lobes. Moreover, we show that there are number fluctuations in the Mott lobes even at zero temperature and therefore that the true Mott-insulating state never exists if the interactions with the dye are included.Applied Science
Lasing in Bose-Fermi mixtures
No full textA.K. acknowledges the support from the EPSRC Established Career Fellowship. V.K., M.D., V.F.S. and A.K. acknowledge support from the Russian Ministry of Science and Education, contract (contract No. 11.G34.31.0067). P.G.S. acknowledges support from Greek GSRT program Aristeia (grant No. 1978). C.S., M. A. J.F., M.K and S.H. acknowledge support from the state of Bavaria.Light amplification by stimulated emission of radiation, well-known for revolutionising photonic science, has been realised primarily in fermionic systems including widely applied diode lasers. The prerequisite for fermionic lasing is the inversion of electronic population, which governs the lasing threshold. More recently, bosonic lasers have also been developed based on Bose-Einstein condensates of exciton-polaritons in semiconductor microcavities. These electrically neutral bosons coexist with charged electrons and holes. In the presence of magnetic fields, the charged particles are bound to their cyclotron orbits, while the neutral exciton-polaritons move freely. We demonstrate how magnetic fields affect dramatically the phase diagram of mixed Bose-Fermi systems, switching between fermionic lasing, incoherent emission and bosonic lasing regimes in planar and pillar microcavities with optical and electrical pumping. We collected and analyzed the data taken on pillar and planar microcavity structures at continuous wave and pulsed optical excitation as well as injecting electrons and holes electronically. Our results evidence the transition from a Bose gas to a Fermi liquid mediated by magnetic fields and light-matter coupling.Peer reviewe
Mott insulators: A large class of materials for Leaky Integrate and Fire (LIF) artificial neuron
No full textInternational audienceA major challenge in the field of neurocomputing is to mimic the brain's behavior by implementing artificial synapses and neurons directly in hardware. Toward that purpose, many researchers are exploring the potential of new materials and new physical phenomena. Recently, a new concept of the Leaky Integrate and Fire (LIF) artificial neuron was proposed based on the electric Mott transition in the inorganic Mott insulator GaTa4Se8. In this work, we report on the LIF behavior in simple two-terminal devices in three chemically very different compounds, the oxide (V0.89Cr0.11)2O3, the sulfide GaMo4S8, and the molecular system [Au(iPr-thiazdt)2] (C12H14AuN2S8), but sharing a common feature, their Mott insulator ground state. In all these devices, the application of an electric field induces a volatile resistive switching and a remarkable LIF behavior under a train of pulses. It suggests that the Mott LIF neuron is a general concept that can be extended to the large class of Mott insulators. © 2018 Author(s)
A mile north of Cold Storage Beach
No full textA Mile North of Cold Storage Beach, by Melissa A. Mott. A Thesis submitted to the Graduate School-Newark Rutgers, The State University of New Jersey in partial fulfillment of the requirements for the degree of Master of Fine Arts in Creative Writing.M.F.A.by Melissa A. Mot
Residual Entropy of the Mott Insulator with No Symmetry Broken
No full textThe half-filled ground state of the Hubbard model on the hypercubic lattice in D dimensions is studied by the Kondo-lattice theory, which is none other than the 1=D expansion theory, but within the constrained Hilbert subspace where no symmetry is allowed to be broken. A gap can open in the single-particle excitation spectrum if and only if the residual entropy or entropy at T = +0 K is nonzero. The Mott insulator with no symmetry broken, if it is possible, is characterized by nonzero residual entropy or nonzero entropy at T = +0 K. This conclusion is consistent with Brinkman and Rice’s theory and the dynamical mean-field theory. According to the well-known argument based on the Bethe-ansatz solution, on the other hand, the half-filled ground state in one dimension is the Mott insulator although its residual entropy per unit cell is vanishing in the thermodynamic limit. Two possible explanations are given for the contradiction between the present paper and the well-known argument
Interacting ultracold gases in optical lattices: non-equilibrium dynamics and effects of disorder
No full textThis dissertation aims at giving a theoretical description of various applications of ultracold gases. A particular focus is cast upon the dynamical evolution of bosonic condensates in non-equilibrium by means of the time-dependent Gutzwiller method. Ground state properties of strongly interacting fermionic atoms in box and speckle disordered lattices are investigated via real-space dynamical mean-field theory. ..
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