Search results for "Gord"

Ac-locking of thermally-induced sine-Gordon breathers

2023

A complete framework for exciting and detecting thermally-induced, stabilized sine-Gordon breathers in ac-driven long Josephson junctions is developed. The formation of long-time stable breathers locked to the ac source occurs for a sufficiently high temperature. The latter emerges as a powerful control parameter, allowing for the remarkably stable localized modes to appear. Nonmonotonic behaviors of both the breather generation probability and the energy spatial correlations versus the thermal noise strength are found. The junction's resistive switching characteristics provides a clear experimental signature of the breather.

Electron structure, ultra-dense hydrogen and low energy nuclear reactions

2019

In this paper, a simple Zitterbewegung electron model, proposed in a previous work, is presented from a different perspective based on the principle of mass- frequency equivalence. A geometric- electromagnetic interpretation of mass, relativistic mass, De Broglie wavelength, Proca, Klein- Gordon, Dirac and Aharonov- Bohm equations in agreement with the model is proposed. A non-relativistic, Zitterbewegung interpretation of the 3.7 keV deep hydrogen level found by J. Naudts is presented. According to this perspective, ultra-dense hydrogen can be conceived as a coherent chain of bosonic electrons with protons or deuterons located in the center of their Zitterbewegung orbits. This approach sug…

Differential proteomics highlights metabolic changes associated with n-hexadecane utilization in a Streptomyces coelicolor strain expressing Gordonia…

2011

Introduction: Alkanes are biodegraded to generate the corresponding primary alcohol trough alkane hydroxylases (AHs) consisting on an integral membrane alkane monooxygenase (AlkB) and two soluble proteins, rubredoxin and rubredoxin reductase. Recently, an alkB gene was reported to be involved in degradation of long chain n-alkanes in the actinobacterium Gordonia sp. SoCg. This gene was expressed in Streptomyces coelicolor M145 which is unable to degrade n-alkanes. Results: The engineered strain, M145-AH, can biotransform n-hexadecane into the corresponding 1-hexadecanol and it is able to grow on n-hexadecane as sole carbon source. Changes in global protein expression associated with n-hexad…

La Parola di Dio iscritta sulla pelle nella prassi artistica post-concettuale di Douglas Gordon

2021

The paper offers an analysis of how tattoos, although they only very recently established a niche of their own in contemporary art, became an important medium of religious art, particularly for Christianity. A central character is identified in Scottish artist Douglas Gordon, a celebrity of todays art world, who addressed the relationship with the Word of God already in his early works. Indeed, Gordon's tattoos are textual and inscribe the body with words. Penance and faith, possession and salvation are at the center of his creativity and find tattoos to be a convenient vehicle to confer a newly rediscovered sacred dimension to the body. In Gordons works the inscription acquires a religious…

Noisy dynamics in long and short Josephson junctions

The study of nonlinear dynamics in long Josephson junctions and the features of a particular kind of junction realized using a graphene layer, are the main topics of this research work. The superconducting state of a Josephson junction is a metastable state, and the switching to the resistive state is directly related to characteristic macroscopic quantities, such as the current the voltage across the junction, and the magnetic field through it. Noise sources can affect the mean lifetime of this superconducting metastable state, so that noise induced effects on the transient dynamics of these systems should be taken into account. The long Josephson junctions are investigated in the sine-Gor…

Magnetically excited breather modes in an overlap-geometry Josephson tunnel junction

2022

A scheme for the controlled generation of single traveling sine- Gordon breathers in a long Josephson junction is described. In the presence of dissipation, a direct current source, and thermal fluctuations, the theoretical analysis shows that, through the nonlinear supratransmission effect, tailored magnetic pulses at the junction’s edge can effectively yield breather modes only.

"Homo Sacer" figūra Nadīnes Gordimeras romānā "Pikaps" un Kiranas Desaji romānā "Mantotā nolemtība"

2020

Dotais maģistra darbs atspoguļo analītisku imigranta tēla lasījumu, kā Džordžo Agambena koncepcijas "homo sacer" iemiesojumu, mūsdienu postkoloniālajā literatūrā. Šajā darbā tika analizēti divi romāni: Nadīnes Gordimeras “Pikaps” (2001) un Kiranas Desaji “Mantotā nolemtība” (2007). Darbā tika pielietota Džordžo Agambena (1998) politiskā teorija. Pētījums tika veikts ar mērķi interpretēt "homo sacer" figūras attēlojumu izvēlētajos romānos, izmantojot salīdzinošo literāro pieeju. Romānu interpretatīvo lasījumu manāmi pastiprināja tādi postkoloniālo literāro studiju metožu veidi kā starpdisciplinaritāte un kontekstualitāte. Pētnieciskā darba rezultāti attēlo imigrantu tēlus, kas tiek reducēti …

Effet du couplage non linéaire dans un système de sine-Gordon modifié

2016

National audience; Cette Communication porte sur une étude numérique visant à montrer les conditions d'existence du phénomène de supratransmission dans un milieu gouverné par l'équation de sine-gordon à couplage mixte: le couplage linéaire pur étant associé à un couplage non linéaire. Nous montrons également l'effet de la variation du coefficient du couplage non linéaire sur l'amplitude de seuil du signal excitateur nécessaire pour déclencher le phénomène de supratransmission dans le milieu, en maintenant constant le coefficient du couplage linéaire pur.

Exploring long chain n-alkane metabolism in Gordonia sp. strain SoCg

2009

Many microorganisms are able to degrade aliphatic hydrocarbons and a relationship between n-alkane utilization and storage compound synthesis has been described in bacteria. The Gram positive GC-rich n-alkane degrader Gordonia sp. strain SoCg, isolated from a long-term accidentally contaminated beach in Sicily, is able to grow on long n-alkanes up to. It carries a single copy of the alkane hydroxylase gene alkB on its chromosome and its alk cluster revealed a genomic organization similar to other alk clusters of alkane-degrading Gram positive bacteria. The alk gene expression, analysed by Real-time RT-PCR, is induced by n-hexadecane and n-triacontane and coupled to alkane consumption. Inter…

Cloning of an alkane hydroxylase system in a long chain n-alkane- degrader Gordonia sp.

2008

Five Gram-positive GC rich n-alkane degraders were isolated from a long-term accidentally contaminated beach in Sicily and identified as one Nocardia, two Rhodococcus and two Gordonia strains (Quatrini et al., 2008 J. Appl. Microbiol. 104:251-9). All the isolates were able to grow on long and very long chain n-alkanes up to C36. Diverging alkane-hydroxylase encoding genes (alkB) were detected by PCR using degenerated primers in all the strains. Multiple sequences were obtained from the Nocardia strain while only one alkB gene was detected in Rhodococcus and Gordonia. The aim of this work is to genetically characterize the alk cluster in one of the two Gordonia strains called SoCg. Pulsed Fi…