Quantum Key Distribution Over Quantum Repeaters with Encoding: Using Error Detection as an Effective Postselection Tool

We propose a postselection technique, based on quantum error detection, for quantum key distribution (QKD) systems that run over quantum repeaters with encoding. In such repeaters, quantum error-correction techniques are used for entanglement distillation. By developing an analytical approach to study such quantum repeaters, we show that, in the context of QKD, it is often more efficient to use the error-detection, rather than the error-correction, capability of the underlying code to sift out cases where an error has been detected. We implement our technique for three-qubit repetition codes by modeling different sources of error in crucial components of the system. We then investigate in detail the impact of such imperfections on the secret key generation rate of the QKD system, and how one can use the information obtained during entanglement swapping and decoding stages to maximize the rate. For benchmarking purposes, we specify the maximum allowed error rates in different components of the setup below which positive key rates can be obtained

Absolutely maximally entangled states, quantum maximum distance separable codes, and quantum repeaters

We extend the relation between absolutely maximally entangled (AME) states and quantum maximum distance separable (QMDS) codes by constructing whole families of QMDS codes from their parent AME states. We introduce a reduction-friendly form for the generator set of the stabilizer representation of an AME state, from which the stabilizer form for children codes, all QMDS, can be obtained. We then relate this to optimal codes for one-way quantum repeaters, by minimizing the short-term infrastructure cost as well as the long-term running cost of such quantum repeaters. We establish that AME states provide a framework for a class of QMDS codes that can be used in quantum repeaters

La calorimetría diferencial de barrido y su aplicación a la Ciencia de Materiales

Se pone de manifiesto la idoneidad de la técnica de calorimetría diferencial de barrido para la caracterización de materiales. Se presentan ejemplos específicos de aplicación de dicha técnica en el estudio de los fenómenos ligados a la transición vitrea y cinética de cristalización de vidrios calcogenuros y metálicos así como en el estudio de la reordenación de fases desordenadas metastables

Evaluation of different lighting sources on the growth and chemical composition of lettuce

ArticleExperiment were carried out in Latvia University of Agriculture in plant growth room. Lettuce Lactuca sativa L. var foliosum cv. ‘Dubacek’ and L . sativa L. cv. ‘Michalina’ were grown under 4 types of lights (luminescence lamps, commercial light emitting diodes (LED) lamps (V - TAC premium series – for plant growing) and two different Lumigrow LED strips - dominant wavelength - blue or red with 14 h ph otoperiod and total photosynthetic active radiation (PAR) 100 μmol m - 2 s - 1 in all variants. Plant weight, length, amount of leaves were measured. Content of chlorophylls, carotenoids, phenols, flavonoids in lettuce was determined three times per vegetation period. In experiments were found that higher lettuce yield was under commercial LED (V - TAC premium series), but these plants contain less soluble sugars, pigments and phenols. Better plant quality was obtained with luminescence lamps. These lettuces have higher sugar, phenols and flavonoids content. Lettuce growth under blue dominate LED (LEDb) was delayed, but these plants contain higher chlorophylls content. The differences in plant growth, response to light and biochemical content b etween cultivars wer e detected

Effect of pharmaceutical intervention on medication adherence and blood pressure control in treated hypertensive patients: Rationale, design and methods of the AFenPA pilot study.

Objetivo: Evaluar el efecto de una intervención farmacéutica protocolizada sobre el control de la presión arterial y la adherencia al tratamiento farmacológico en pacientes usuarios de farmacias comunitarias.Material y métodos: Estudio cuasi-experimental con grupo control en el que se comparará el efecto de una intervención farmacéutica (grupo intervención) con el proceso de atención habitual (grupo control), sobre la presión arterial y la adherencia al tratamiento de pacientes hipertensos tratados farmacológicamente en farmacias comunitarias. Los pacientes serán distribuidos de forma equitativa en ambos grupos (n control = n intervención) y serán seguido durante 6 meses. El programa de la intervención farmacéutica constará de tres partes fundamentales: 1) educación/información al paciente sobre aspectos relacionados con la hipertensión y adherencia al tratamiento farmacológico, 2) automonitorización de la presión arterial y, 3) interacción con el médico mediante informes personalizados cuando la media de las cifras de presión arterial realizadas en el domicilio superen el objetivo terapéutico acorde con la situación clínica del paciente. Para evaluar el efecto de la intervención farmacéutica sobre la adherencia terapéutica y la presión arterial se obtendrán medidas de presión arterial en la farmacia y porcentaje de cumplimiento terapéutico mediante recuento de comprimidos en ambos grupos al principio y al final del estudio.Discusión: Según nuestros conocimientos, éste es el primer estudio que se realiza en farmacia comunitaria en España para probar la efectividad de una intervención farmacéutica conjuntamente con la automedida de la presión arterial sobre el control de la presión arterial. Además, la intervención farmacéutica se ha diseñado de forma que pueda integrase como práctica habitual enmarcada dentro de la Atención Farmacéutica.Objective: To assess the effect of a protocol-based pharmacist intervention on blood pressure control and medication adherence among treated hypertensive patients who are users of community pharmacies.Methods: A quasi experimental study design with control group has been designed to compare the effect of pharmaceutical intervention (intervention group) versus the standard healthcare procedure (control group) on blood pressure and medication adherence among hypertensive patients receiving drug therapy in community pharmacies. The patients will be allocated evenly between the two groups (ncontrol = nintervention), with a 6-month follow-up. The pharmaceutical intervention program will comprise three main parts: 1) patient education / information on issues relating to hypertension and medication adherence; 2) self-monitoring of blood pressure; and 3) interaction with the physician through personalized reports when the mean blood pressure values recorded at home exceed the treatment goal according to the clinical condition of the patient. In order to evaluate the effect of the pharmaceutical intervention upon medication adherence and blood pressure, blood pressure recordings will be made in the pharmacy, while percent medication adherence will be established based on pill count in both groups at the start and end of the study.Discussion: To our knowledge, this is the first study in the community pharmacy setting in Spain to evaluate the effectiveness of pharmaceutical intervention in combination with home blood pressure monitoring on blood pressure control. In addition, the pharmaceutical intervention has been designed for inclusion as standard practice in the context of Pharmaceutical Care

Dynamic modelling of nitrous oxide emissions from three Swedish sludge liquor treatment systems

The objective of this paper is to model the dynamics and validate the results of nitrous oxide (N2O) emissions from three Swedish nitrifying/denitrifying, nitritation and anammox systems treating real anaerobic digester sludge liquor. The Activated Sludge Model No. 1 is extended to describe N2O production by both heterotrophic and autotrophic denitrification. In addition, mass transfer equations are implemented to characterize the dynamics of N2O in the water and the gas phases. The biochemical model is simulated and validated for two hydraulic patterns: (1) a sequencing batch reactor; and (2) a moving-bed biofilm reactor. Results show that the calibrated model is partly capable of reproducing the behaviour of N2O as well as the nitritation/nitrification/denitrification dynamics. However, the results emphasize that additional work is required before N2O emissions from sludge liquor treatment plants can be generally predicted with high certainty by simulations. Continued efforts should focus on determining the switching conditions for different N2O formation pathways and, if full-scale data are used, more detailed modelling of the measurement devices might improve the conclusions that can be drawn.</jats:p

Apparent effect of range size and fruit colour on palm diversification may be spurious

Aim Fruit selection by animal dispersers with different mobility directly impacts plant geographical range size, which, in turn, may impact plant diversification. Here, we examine the interaction between fruit colour, range size and diversification rate in palms by testing two hypotheses: (1) species with fruit colours attractive to birds have larger range sizes due to high dispersal ability and (2) disperser mobility affects whether small or large range size has higher diversification, and intermediate range size is expected to lead to the highest diversification rate regardless of disperser.Location Global.Time Period Contemporary (or present).Major Taxa Studied Palms (Arecaceae).Methods Palm species were grouped based on likely animal disperser group for given fruit colours. Range sizes were estimated by constructing alpha convex hull polygons from distribution data. We examined disperser group, range size or an interaction of both as possible drivers of change in diversification rate over time in a likelihood dynamic model (Several Examined State-dependent Speciation and Extinction [SecSSE]). Models were fitted, rate estimates were retrieved and likelihoods were compared to those of appropriate null models.Results Species with fruit colours associated with mammal dispersal had larger ranges than those with colours associated with bird dispersal. The best fitting SecSSE models indicated that the examined traits were not the primary driver of the heterogeneity in diversification rates in the model. Extinction rate complexity had a marked impact on model performance and on diversification rates.Main Conclusions Two traits related to dispersal mobility, range size and fruit colour, were not identified as the main drivers of diversification in palms. Increased model extinction rate complexity led to better performing models, which indicates that net diversification should be estimated rather than speciation alone. However, increased complexity may lead to incorrect SecSSE model conclusions without careful consideration. Finally, we find palms with more mobile dispersers do not have larger range sizes, meaning other factors are more important determinants of range size

La enseñanza en Comunicación y su proceso de adaptación al EEES como objeto de estudio: una visión panorámica

En los últimos años, España ha vivido la incorporación de la enseñanza universitaria en Comunicación al Espacio Europeo de Educación Superior (EEES). Este proceso ha generado un creciente interés por parte de la comunidad científica, y derivado en variadas investigaciones y trabajos académicos. Este artículo busca aproximarse a la mirada que nuestro campo académico ha construido sobre este proceso, a través de una revisión de los artículos publicados, hasta la fecha, en revistas españolas especializadas en Comunicación, que abordan alguna arista de la adaptación de los grados y postgrados de Periodismo, Comunicación Audiovisual, y Publicidad y Relaciones Públicas, al EEES.In recent years in Spain, university teaching of Communication has been adapted to European Higher Education Area. This process has been studied and analyzed by scientific community of Communication. Thanks this interest, today there are several academic research and papers about this issue. In this context, our aim is to built a global view of the academic papers which have been published in Spanish scientific Communication magazines about adjustment to EHEA of degrees and postgraduate programs of Journalism, Audiovisual Communication, and Advertising and Public Relations

A plant wide aqueous phase chemistry model describing pH variations and ion speciation/pairing in wastewater treatment process models

There is a growing interest within the Wastewater Treatment Plant (WWTP) modelling community to correctly describe physico–chemical processes after many years of mainly focusing on biokinetics. Indeed, future modelling needs, such as a plant-wide phosphorus (P) description, require a major, but unavoidable, additional degree of complexity when representing cationic/anionic behaviour in Activated Sludge (AS)/Anaerobic Digestion (AD) systems. In this paper, a plant-wide aqueous phase chemistry module describing pH variations plus ion speciation/pairing is presented and interfaced with industry standard models. The module accounts for extensive consideration of non-ideality, including ion activities instead of molar concentrations and complex ion pairing. The general equilibria are formulated as a set of Differential Algebraic Equations (DAEs) instead of Ordinary Differential Equations (ODEs) in order to reduce the overall stiffness of the system, thereby enhancing simulation speed. Additionally, a multi-dimensional version of the Newton–Raphson algorithm is applied to handle the existing multiple algebraic inter-dependencies. The latter is reinforced with the Simulated Annealing method to increase the robustness of the solver making the system not so dependant of the initial conditions. Simulation results show pH predictions when describing Biological Nutrient Removal (BNR) by the activated sludge models (ASM) 1, 2d and 3 comparing the performance of a nitrogen removal (WWTP1) and a combined nitrogen and phosphorus removal (WWTP2) treatment plant configuration under different anaerobic/anoxic/aerobic conditions. The same framework is implemented in the Benchmark Simulation Model No. 2 (BSM2) version of the Anaerobic Digestion Model No. 1 (ADM1) (WWTP3) as well, predicting pH values at different cationic/anionic loads. In this way, the general applicability/flexibility of the proposed approach is demonstrated, by implementing the aqueous phase chemistry module in some of the most frequently used WWTP process simulation models. Finally, it is shown how traditional wastewater modelling studies can be complemented with a rigorous description of aqueous phase and ion chemistry (pH, speciation, complexation)

Apparent effect of range size and fruit colour on palm diversification may be spurious

ACKNOWLEDGEMENTS This work was supported by the Biodiversity and Ecosystem Services in a Changing Climate Strategic Research Area at the University of Gothenburg. C.C.S. was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil and the São Paulo Research Foundation (FAPESP; 2020-09164-0). S.F. was supported by the Swedish Research Council (2017-03862); C.D.B. and M.F.T.J. were supported by the Swedish Research Council (2017-04980). The computation was enabled by resources provided by the National Academic Infrastructure for Supercomputing in Sweden (NAISS) and the Swedish National Infrastructure for Computing (SNIC) at PDC and HPC2N, respectively, partially funded by the Swedish Research Council through grant agreements no. 2022-06725 and no. 2018-05973. There were no permits required for this work. Research Funding Biodiversity and Ecosystem Services in a Changing Climate Strategic Research Area Coordenação de Aperfeiçoamento de Pessoal de Nível Superior VetenskapsrådetPeer reviewedPublisher PD