Tunable and robust long-range coherent interactions between quantum emitters mediated by Weyl bound states

Long-range coherent interactions between quantum emitters are instrumental for quantum information and simulation technologies, but they are generally difficult to isolate from dissipation. Here, we show how such interactions can be obtained in photonic Weyl environments due to the emergence of an exotic bound state whose wavefunction displays power-law spatial confinement. Using an exact formalism, we show how this bound state can mediate coherent transfer of excitations between emitters, with virtually no dissipation and with a transfer rate that follows the same scaling with distance as the bound state wavefunction. In addition, we show that the topological nature of Weyl points translates into two important features of the Weyl bound state, and consequently of the interactions it mediates: first, its range can be tuned without losing the power-law confinement, and, second, they are robust under energy disorder of the bath. To our knowledge, this is the first proposal of a photonic setup that combines simultaneously coherence, tunability, long-range, and robustness to disorder. These findings could ultimately pave the way for the design of more robust long-distance entanglement protocols or quantum simulation implementations for studying long-range interacting systems

Corporate bonds, asset-backed securities and deferred checks in Argentina

We describe the evolution of three types of corporate securities in Argentina, namely, corporate bonds, asset-backed securities and deferred checks. Corporate bonds (obligaciones negociables) were legally authorized in 1988, and after a tax reform in 1991 they became an important financing vehicle. Asset backed securities (fideicomisos), legally created in 1995, have been issued since 1996. They typically bundle together small credits of a similar category. Deferred checks (cheques de pago diferido) exist since 1993, alongside standard checks. They can be negotiated on the exchange since 2003, and are akin to commercial paper. Corporate bonds have been overwhelmingly issued by large firms and banks, with an average issue size of 53 million dollars. Asset backed securities have an average value of 9 million dollars. Deferred checks are typically used by smaller firms, and those traded on the exchange of the Buenos Aires board of trade have an average value of 9 thousand dollars.private securities, corporate bonds, asset-backed securities, deferred checks

Vulnerabilidad, adaptación y resistencia en la cultura alimentaria en México: un enfoque desde los Frentes Culturales

Mexico is living a food crisis, which consequences can be seeing in the height rate of obesity and the non-communicable disease linked to malnutrition. In article we present an interpretation about the Mexican food culture’s changes that have generated the so-called obesity epidemic. Using the analytic framework of Cultural Fronts we describe the vulnerability, the adaptation and resistance in Mexican food culture in order to explaine the symbolic relations between food and Mexican society.México esta viviendo una crisis de soberanía y autonomía alimentaria, las cuales consecuencias se pueden ver en la alta tasa de obesidad y enfermedades vinculas a la malnutrición. En el presente artículo utilizando la categoría analítica de frentes culturales exploraremos tres principales características de las relaciones simbólicas entre alimentación y sociedad mexicana: la vulnerabilidad, la adaptabilidad, la resistencia. El objetivo del texto es presentar algunas claves de lectura para comprender los cambios experimentados en la cultura alimentaria mexicana, que han generado la así llamada epidemia de obesidad en el país

Database of corporate bonds from Argentina

This document describes the construction of a database of corporate bonds issued by firms in Argentina between 1989 and 2005. The database draws on two main sources, the Bolsa de Comercio de Buenos Aires and the Comisión Nacional de Valores, while some additional information comes from the Mercado Abierto Electrónico. In all, we collected information on 1356 corporate bonds, though there are some bonds that have fields with missing information. Our data basically covers the characteristics of the bonds at time of issue. That is, we do not have a detailed description of how the characteristics of those corporate bonds that defaulted in 2001/2002 and were subsequently renegotiated changed. Based on the data from the primary markets, we constructed a series with the total outstanding stock of corporate bonds over this period. The information in the database allows to calculate these stocks at the firm level.primary markets, corporate bonds, institutional framework

ParRADMeth: Identification of Differentially Methylated Regions on Multicore Clusters

© 2023 IEEE. This version of the article has been accepted for publication, after peer review. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The Version of Record is available online at: https://doi.org/10.1109/TCBB.2022.3230473Versión aceptada final de: A. Fernandez-Fraga, J. Gonzalez-Dominguez and J. Tourino, "ParRADMeth: Identification of Differentially Methylated Regions on Multicore Clusters" in IEEE/ACM Transactions on Computational Biology and Bioinformatics, vol. 20, no. 03, pp. 2041-2049, 2023. https://doi.org/10.1109/TCBB.2022.3230473[Abstract]: The discovery of Differentially Methylated (DM) regions is an important research field in biology, as it can help to anticipate the risk of suffering from specific diseases. Nevertheless, the high computational cost of the bioinformatic tools developed for this purpose prevents their application to large-scale datasets. Hence, much faster tools are required to further progress in this research field. In this work we present ParRADMeth, a parallel tool that applies beta-binomial regression for the identification of these DM regions. It is based on the state-of-the-art sequential tool RADMeth, which proved superior biological accuracy compared to counterparts in previous experimental evaluations. ParRADMeth provides the same DM regions as RADMeth but at significantly reduced runtime thanks to exploiting the compute capabilities of common multicore CPU clusters. For example, our tool is up to 189 times faster for real data experiments on a cluster with 16 nodes, each one containing two eight-core processors. The source code of ParRADMeth, as well as a reference manual, are available at https://github.com/UDC-GAC/ParRADMeth.This work was supported in part by the Ministry of Science and Innovation of Spain under Grants PID2019-104184RB-I00 and / AEI / 10.13039/501100011033, and in part by the Xunta de Galicia and FEDER funds (Centro de Investigacion de Galicia accreditation 2019-2022 and Consolidation Program of Competitive Reference Groups) under Grants ED431 G 2019/01 and ED431 C 2021/30.Xunta de Galicia; ED431 G 2019/01Xunta de Galicia; ED431 C 2021/3

Electroreactivity of isopropanol on platinum in acids studied by DEMS and FTIRS

The reactivity of isopropanol on polycrystalline Pt in acid solutions was investigated using in-situ Fourier transform IR spectroscopy (FTIRS) and on-line differential electrochemical mass spectrometry (DEMS). The electro-oxidation products are acetone and CO2; the former is observed when isopropanol is present in the bulk of the solution, and the latter is produced from strongly adsorbed species. Both bulk and adsorbed isopropanol electro-reduction yield propane. H-D exchange is observed during propane formation when the reaction takes place in a D2O + DCIO4 solution. This observation suggests the formation of adsorbates bonded to the surface through the C ∝ atom of the isopropanol molecule. FTIR spectra of adsorbed species show the presence of -CH3 and -COH groups. The most probable adsorbate structures are (CH3-C-CH3)Pt, (CH3-CH-CH3)Pt and (CH3-COH-CH3)Pt, presumably accompanied by (CH3-CO-CH3)Pt.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exacta

Electroreactivity of isopropanol on platinum in acids studied by DEMS and FTIRS

The reactivity of isopropanol on polycrystalline Pt in acid solutions was investigated using in-situ Fourier transform IR spectroscopy (FTIRS) and on-line differential electrochemical mass spectrometry (DEMS). The electro-oxidation products are acetone and CO2; the former is observed when isopropanol is present in the bulk of the solution, and the latter is produced from strongly adsorbed species. Both bulk and adsorbed isopropanol electro-reduction yield propane. H-D exchange is observed during propane formation when the reaction takes place in a D2O + DCIO4 solution. This observation suggests the formation of adsorbates bonded to the surface through the C ∝ atom of the isopropanol molecule. FTIR spectra of adsorbed species show the presence of -CH3 and -COH groups. The most probable adsorbate structures are (CH3-C-CH3)Pt, (CH3-CH-CH3)Pt and (CH3-COH-CH3)Pt, presumably accompanied by (CH3-CO-CH3)Pt.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exacta

Single-Board-Computer Clusters for Cloudlet Computing in Internet of Things

The number of connected sensors and devices is expected to increase to billions in the near future. However, centralised cloud-computing data centres present various challenges to meet the requirements inherent to Internet of Things (IoT) workloads, such as low latency, high throughput and bandwidth constraints. Edge computing is becoming the standard computing paradigm for latency-sensitive real-time IoT workloads, since it addresses the aforementioned limitations related to centralised cloud-computing models. Such a paradigm relies on bringing computation close to the source of data, which presents serious operational challenges for large-scale cloud-computing providers. In this work, we present an architecture composed of low-cost Single-Board-Computer clusters near to data sources, and centralised cloud-computing data centres. The proposed cost-efficient model may be employed as an alternative to fog computing to meet real-time IoT workload requirements while keeping scalability. We include an extensive empirical analysis to assess the suitability of single-board-computer clusters as cost-effective edge-computing micro data centres. Additionally, we compare the proposed architecture with traditional cloudlet and cloud architectures, and evaluate them through extensive simulation. We finally show that acquisition costs can be drastically reduced while keeping performance levels in data-intensive IoT use cases.Ministerio de Economía y Competitividad TIN2017-82113-C2-1-RMinisterio de Economía y Competitividad RTI2018-098062-A-I00European Union’s Horizon 2020 No. 754489Science Foundation Ireland grant 13/RC/209

Eksplicitna regulacija sile robotskog manipulatora aktivnim prigušenjem brzine

This paper presents a new interaction control structure that generates a family of explicit force regulators for robot manipulators. The proposed structure includes a term of a class of proportional-type functions in terms of force error; the force error is defined as the difference between a desired force and the actual force measured with a force sensor located at the end-effector. Also, the structure includes a generalized active velocity damping term in order to have a control of the energy dissipation, and a term used to compensate the gravity forces of the links. The stability analysis is performed in Lyapunov sense. An experimental comparison of two new explicit force regulators and the linear proportional structure, on a three degree-of-freedom, direct-drive robot, is presented. Also, proofs of the most important properties of the Cartesian dynamic model, are presented.Ovaj rad predstavlja novu interakcijsku kontrolnu strukturu koja predstavlja skupinu exsplicitnih regulatora sile za robotske manipulatore. Predložena struktura uključuje član klase funkcija proporcionalnog tipa u smilsu pogreške sile; pogreška sile se definira kao razlika između željene sile i stvarne sile koju mjere senzori postavljeni na kraju manipulatora. Također, struktura uključuje član za generalizirano aktvino prigušenje brzine kako bi se omogućila kontrola disipacije energije i član kojim se kompenzira utjecaj sile gravitacije na članke manipulatora. Analiza stabilnosti je napravljena u smislu Lyapunova. Prikazana je eksperimentalna usporedba dva nova eksplicitna regulatora sile i linearno-proporcionalne strukture na robotu s direktnim pogonom i tri stupnja slobode. Također su prikazani dokazi najvažnijih svojstava kartezijskog dinamičnog modela