Soil and water pollution in a banana production region in tropical Mexico

The effects of abundant Mancozeb (Mn, Zn— bisdithiocarbamate) applications (2.5 kg ha-1week-1 for 10 years) on soil and surface-, subsurface- and groundwater pollution were monitored in a banana production region of tropical Mexico. In soils, severe manganese accumulation was observed, wheras the main metabolite ethylenethiourea was near the detection limit. Surface and subsurface water was highly polluted with ethylenethiourea, the main metabolite of Mancozeb (22.5 and 4.3 lg L-1, respectively), but not with manganese. In deep ground water, no ethylenethiourea was detected. The level of pollution in the region presents a worrisome risk for aquatic life and for human health

Driven open quantum systems and Floquet stroboscopic dynamics

We provide an analytic solution to the problem of system-bath dynamics under the effect of high-frequency driving that has applications in a large class of settings, such as driven-dissipative many-body systems. Our method relies on discrete symmetries of the system-bath Hamiltonian and provides the time evolution operator of the full system, including bath degrees of freedom, without weak-coupling or Markovian assumptions. An interpretation of the solution in terms of the strobo- scopic evolution of a family of observables under the influence of an effective static Hamiltonian is proposed, which constitutes a flexible simulation procedure of non-trivial Hamiltonians. We instan- tiate the result with the study of the spin-boson model with time-dependent tunneling amplitude. We analyze the class of Hamiltonians that may be stroboscopically accessed for this example and illustrate the dynamics of system and bath degrees of freedom.Comment: Corrected minor typos in reference

Topological pumping of photons in nonlinear resonator arrays

We show how to implement topological or Thouless pumping of interacting photons in one dimensional nonlinear resonator arrays, by simply modulating the frequency of the resonators periodically in space and time. The interplay between interactions and the adiabatic modulations enables robust transport of Fock states with few photons per site. We analyze the transport mechanism via an effective analytic model and study its topological properties and its protection to noise. We conclude by a detailed study of an implementation with existing circuit QED architectures.Comment: 5 pages, 4 figures, and Supplemental Material. Comments are welcom

Propuesta metodológica de intercambio electrónico de información clínica basada en estándares de telemedicina/Methodological proposal of electronic data interchange and clinical information based on telemedicine standards

El avance de las tecnologías de la información ha permitido un cambio sustancial en el desarrollo de la Salud, por lo que el uso de estándares de telemedicina como el HL7 y CEN TC 251-13606 permiten que los sistemas de información médica se comuniquen vía mensajes estandarizados facilitando el uso de los mismos. El propósito de este estudio es crear una guía metodológica de intercambio electrónico de información clínica basada en el análisis de los estándares de telemedicina HL7 y CEN TC 251- 13606 para mejorar la eficiencia de la gestión de Historias Clínicas de los pacientes. La metodología consta de 2 fases, la primera plantea el diseño e implementación del modelo de referencia de la Historia Clínica Electrónica, el mismo que define entidades necesarias en la construcción de una Historia Clínica Electrónica, en la fase 2 se define la arquitectura de la historia clínica especificando la estructura y semántica del documento mediante el lenguaje XML, el cual se utiliza en los procesos de gestión de las historias clínicas electrónicas dentro del sistema médico desarrollado. Este sistema permite control clínico a distancia facilitando la interacción médico-paciente. El sistema posee una aplicación web, una aplicación de escritorio y una plataforma hardware e- Salud. La aplicación de la metodología planteada mejora la eficiencia de la gestión de historias clínicas, puesto que el 83.32% de los médicos de la clínica consideran que se agiliza el proceso de acceso, creación e ingreso de historias clínicas y reduce recursos en el proceso de control de pacientes domiciliarios. The advance of Information and Communication Technologies has improved Health Care in last years; by providing new ways of accessing medical information. In particular, the use of telemedicine standards such as HL7 and CENTC 251-13606 allows standard communication, integration, and retrieval of electronic health records among medical systems. This article aims to create a methodological guide for the electronic exchange of clinical information based on telemedicine standards in order to improve the efficiency of electronic health records management. The proposed methodology consists of two phases: The first one states the design and implementation of the reference model of an electronic health records, which defines entities of the electronic health record. In phase 2, this methodology describes electronic health records architecture. The architecture is defined by the structure and semantics of the document using XML. In order to test the proposed methodology, a medical system was implemented that consists of a web application, desktop application, and hardware platform e- Health. This system allows the electronic exchange of clinical information to ease patient-doctor interaction. The results show 83,32% of doctors at the clinic where the system was tested agree the proposed methodology for electronic exchange improves the efficiency of electronic health records management since it speeds up the process of creation and retrieval of an electronic health records. Moreover, the system reduces resources in the control of home patients. Palabras clave: Telemedicina, HCE, HL7, CENTC 251-13606, e-Salud. Keywords: Telemedicine, EHR, HL7, CENTC 251-13606, e-Health

Floquet stroboscopic divisibility in non-Markovian dynamics

We provide a general discussion of the Liouvillian spectrum for a system coupled to a non-Markovian bath using Floquet theory. This approach is suitable when the system is described by a time-convolutionless master equation with time-periodic rates. Surprisingly, the periodic nature of rates allow us to have a stroboscopic divisible dynamical map at discrete times, which we refer to as Floquet stroboscopic divisibility. We illustrate the general theory for a Schr\"odinger cat which is roaming inside a non-Markovian bath, and demonstrate the appearance of stroboscopic revival of the cat at later time after its death. Our theory may have profound implications in entropy production in non-equilibrium systems.Comment: We changed the title and explained in more detail the definition of non-Markovian dynamics used in the manuscrip

Photon-resolved Floquet theory in open quantum systems

Photon-resolved Floquet theory keeps track of the photon exchange of a quantum system with a coherent driving field. It thus complements the standard full-counting statistics that counts the number of photons exchanged with incoherent photon modes giving rise to dissipation. In this paper, we introduce a unifying framework describing both situations. We develop methods suitable for an analytical evaluation of low-order cumulants of photonic probability distributions. Within this framework we analyze the two-mode Jaynes-Cummings model to demonstrate that the Photon-resolved Floquet theory and the standard full-counting statistics make consistent statistical predictions. Interestingly, we find that the photon-flux fluctuations diverge for vanishing dissipation, which can be related to an entanglement effect between the driven matter system and the driving field. To substantiate our results, we use our framework to describe efficient photon up-conversion in an ac-driven lambda system, that is characterized by a high signal-to-noise ratio. As the framework is non-perturbative and predicts fluctuations, it paves the way towards non-perturbative spectroscopy, which will assist to improve metrological methods.Comment: 25 pages, 6 figures, 4 appendices. Comments are welcom