Dipole blockade through Rydberg Forster resonance energy transfer

High resolution laser excitation of np Rydberg states of cesium atoms shows a dipole blockade at F\"{o}rster resonances corresponding to the resonant dipole-dipole energy transfer of the np + np → ns + (n + 1)s reaction. The dipole-dipole interaction can be tuned on and off by the Stark effect, and such a process observed for relatively low n (25 − 41) is promising for quantum gate devices. Both Penning ionization and saturation in the laser excitation can limit the range of observation of the dipole blockadeComment: number of pages:

Electric-field induced dipole blockade with Rydberg atoms

High resolution laser Stark excitation of np (60 < n < 85) Rydberg states of ultra-cold cesium atoms shows an efficient blockade of the excitation attributed to long-range dipole-dipole interaction. The dipole blockade effect is observed as a quenching of the Rydberg excitation depending on the value of the dipole moment induced by the external electric field. Effects of eventual ions which could match the dipole blockade effect are discussed in detail but are ruled out for our experimental conditions. Analytic and Monte-Carlo simulations of the excitation of an ensemble of interacting Rydberg atoms agree with the experiments indicates a major role of the nearest neighboring Rydberg atom.Comment: 4 page

L’utilisation du studio d’enregistrement dans Sgt. Pepper’s Lonely Hearts Club Band

Parmi les nombreuses révolutions musicales opérées par les Beatles en 1967, la vision d’un album rock en tant qu’œuvre d’art cohérente et détachée du recueil de chansons s’est imposée comme un modèle pour l’histoire de la pop. Le processus de création à l’origine de Sgt. Pepper’s Lonely Hearts Club Band, unissant les domaines de la composition, de l’arrangement et de l’interprétation, nécessite cinq mois de travail dans les studios anglais d’Abbey Road. Les musiciens se libèrent de la formation rock traditionnelle guitare, basse et batterie, pour inviter des instruments empruntés à l’orchestre classique, à la musique indienne ou au jazz. Assisté par son producteur et son ingénieur du son, le groupe expérimente de nouvelles possibilités sonores et repousse les limites technologiques en manipulant les bandes magnétiques et les effets sonores. Cet article décrit les différentes étapes de conception de Sgt. Pepper’s Lonely Hearts Club Band en étudiant l’apport des techniques du studio d’enregistrement et son usage novateur comparable à celui d’un outil de composition.The Beatles made some revolutionary changes in the musical world with their 1967 recordings. Among them a new model for pop records stands out: the album is now seen as a work of art beyond the song collection it was before. Sgt. Pepper’s Lonely Hearts Club Band, recorded over five months in Abbey Road studios and released in June 1967, comes from a new creative process where composition, arrangement and performance become one. Freed from traditional rock instrumentation – using only guitars, bass and drums –, the Beatles add classical, Indian and jazz instruments. They experiment new sounds by using studio techniques with the assistance of their producer and sound engineer. This article describes the recording process behind Sgt. Pepper’s Lonely Hearts Club Band by studying how the recording studio is used as a compositional tool

L’utilisation du studio d’enregistrement dans Sgt. Pepper’s Lonely Hearts Club Band

Parmi les nombreuses révolutions musicales opérées par les Beatles en 1967, la vision d’un album rock en tant qu’œuvre d’art cohérente et détachée du recueil de chansons s’est imposée comme un modèle pour l’histoire de la pop. Le processus de création à l’origine de Sgt. Pepper’s Lonely Hearts Club Band, unissant les domaines de la composition, de l’arrangement et de l’interprétation, nécessite cinq mois de travail dans les studios anglais d’Abbey Road. Les musiciens se libèrent de la formation rock traditionnelle guitare, basse et batterie, pour inviter des instruments empruntés à l’orchestre classique, à la musique indienne ou au jazz. Assisté par son producteur et son ingénieur du son, le groupe expérimente de nouvelles possibilités sonores et repousse les limites technologiques en manipulant les bandes magnétiques et les effets sonores. Cet article décrit les différentes étapes de conception de Sgt. Pepper’s Lonely Hearts Club Band en étudiant l’apport des techniques du studio d’enregistrement et son usage novateur comparable à celui d’un outil de composition.The Beatles made some revolutionary changes in the musical world with their 1967 recordings. Among them a new model for pop records stands out: the album is now seen as a work of art beyond the song collection it was before. Sgt. Pepper’s Lonely Hearts Club Band, recorded over five months in Abbey Road studios and released in June 1967, comes from a new creative process where composition, arrangement and performance become one. Freed from traditional rock instrumentation – using only guitars, bass and drums –, the Beatles add classical, Indian and jazz instruments. They experiment new sounds by using studio techniques with the assistance of their producer and sound engineer. This article describes the recording process behind Sgt. Pepper’s Lonely Hearts Club Band by studying how the recording studio is used as a compositional tool

Comparing paedophile activity in different P2P systems

Peer-to-peer (P2P) systems are widely used to exchange content over the Internet. Knowledge on paedophile activity in such networks remains limited while it has important social consequences. Moreover, though there are different P2P systems in use, previous academic works on this topic focused on one system at a time and their results are not directly comparable. We design a methodology for comparing \kad and \edonkey, two P2P systems among the most prominent ones and with different anonymity levels. We monitor two \edonkey servers and the \kad network during several days and record hundreds of thousands of keyword-based queries. We detect paedophile-related queries with a previously validated tool and we propose, for the first time, a large-scale comparison of paedophile activity in two different P2P systems. We conclude that there are significantly fewer paedophile queries in \kad than in \edonkey (approximately 0.09% \vs 0.25%).Comment: Submitte

Deep functional multiple index models with an application to SER

Speech Emotion Recognition (SER) plays a crucial role in advancing human-computer interaction and speech processing capabilities. We introduce a novel deep-learning architecture designed specifically for the functional data model known as the multiple-index functional model. Our key innovation lies in integrating adaptive basis layers and an automated data transformation search within the deep learning framework. Simulations for this new model show good performances. This allows us to extract features tailored for chunk-level SER, based on Mel Frequency Cepstral Coefficients (MFCCs). We demonstrate the effectiveness of our approach on the benchmark IEMOCAP database, achieving good performance compared to existing methods.Comment: 5 pages, 1 figur

Microbial population changes during bioremediation of nitroaromatic - and nitramine-contaminated lagoon

Nitration reactions of aromatic compounds are commonly involved in military industrial processes. Military industries treated their process effluents using lagoon systems for many years. In this study, the sediment of a lagoon was investigated from a bioremediation objective. The physico-chemical characterization of the sediments showed the organic nature of the sediment (25.4% carbon with a C:N ¼ 3) highly concentrated in RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) as well as two herbicides Dinoterb (2-tert-butyl-4,6-dinitrophenol) and Dinoseb (2-sec-butyl-4,6-dinitrophenol). Analysis of the 16S rRNA gene clone library revealed the presence of three dominant families, Geobacteriacea, Clostridiaceae and Pseudomonaceae. A bioremediation assay was carried out in anaerobic conditions in order to degrade organic compounds. In these conditions, 100% of Dinoterb and Dinoseb were degraded after 75 days of culture, while RDX and HMX were not consumed. The 16S rRNA gene clone library analysis of this incubation showed a drastic reduction of the final biodiversity composed by clones related to Enterobacteriaceae (especially Leclercia adecarboxylata) and Pseudomonaceae family. It was then suggested that Enterobacteriaceae and Pseudomonaceae were potentially involved in biodegradation of these two herbicides. To confirm this hypothesis, cultures were carried out with isolated species of Pseudomonas putida, Pseudomonas citronellolis and L. adecarboxylata in the presence of Dinoterb. The data confirmed that in the presence of glucose, these microorganisms are able to consume Dinoterb

Gate control of spin-layer-locking FETs and application to monolayer LuIO

A recent 2D spinFET concept proposes to switch electrostatically between two separate sublayers with strong and opposite intrinsic Rashba effects. This concept exploits the spin-layer locking mechanism present in centrosymmetric materials with local dipole fields, where a weak electric field can easily manipulate just one of the spin channels. Here, we propose a novel monolayer material within this family, lutetium oxide iodide (LuIO). It displays one of the largest Rashba effects among 2D materials (up to $k_R = 0.08$ {\AA}$^{-1}$), leading to a $\pi/2$ rotation of the spins over just 1 nm. The monolayer had been predicted to be exfoliable from its experimentally-known 3D bulk counterpart, with a binding energy even lower than graphene. We characterize and model with first-principles simulations the interplay of the two gate-controlled parameters for such devices: doping and spin channel selection. We show that the ability to split the spin channels in energy diminishes with doping, leading to specific gate-operation guidelines that can apply to all devices based on spin-layer locking.Comment: 11 pages, 9 figure

Remote free-carrier screening to boost the mobility of Fröhlich-limited two-dimensional semiconductors

Van der Waals heterostructures provide a versatile tool to not only protect or control, but also enhance the properties of a 2D material. We use ab initio calculations and semi-analytical models to find strategies which boost the mobility of a current-carrying 2D semiconductor within an heterostructure. Free-carrier screening from a metallic "screener" layer remotely suppresses electron-phonon interactions in the current-carrying layer. This concept is most effective in 2D semiconductors whose scattering is dominated by screenable electron-phonon interactions, and in particular the Fr\"ohlich coupling to polar-optical phonons. Such materials are common and characterised by overall low mobilities in the small doping limit, and much higher ones when the 2D material is doped enough for electron-phonon interactions to be screened by its own free carriers. We use GaSe as a prototype and place it in a heterostructure with doped graphene as the "screener" layer and BN as a separator. We develop an approach to determine the electrostatic response of any heterostructure by combining the responses of the individual layers computed within density-functional perturbation theory. Remote screening from graphene can suppress the long-wavelength Fr\"ohlich interaction, leading to a consistently high mobility around $500$ to $600$ cm$^2$/Vs for carrier densities in GaSe from $10^{11}$ to $10^{13}$ cm$^{-2}$. Notably, the low-doping mobility is enhanced by a factor 2.5. This remote free-carrier screening is more efficient than more conventional manipulation of the dielectric environment, and it is most effective when the separator (BN) is thin.Comment: 20 pages, 14 figure