Local distinguishability of quantum states in infinite dimensional systems

We investigate local distinguishability of quantum states by use of the convex analysis about joint numerical range of operators on a Hilbert space. We show that any two orthogonal pure states are distinguishable by local operations and classical communications, even for infinite dimensional systems. An estimate of the local discrimination probability is also given for some family of more than two pure states

New approximations for the cone of copositive matrices and its dual

We provide convergent hierarchies for the cone C of copositive matrices and its dual, the cone of completely positive matrices. In both cases the corresponding hierarchy consists of nested spectrahedra and provide outer (resp. inner) approximations for C (resp. for its dual), thus complementing previous inner (resp. outer) approximations for C (for the dual). In particular, both inner and outer approximations have a very simple interpretation. Finally, extension to K-copositivity and K-complete positivity for a closed convex cone K, is straightforward.Comment: 8

Social welfare and profit maximization from revealed preferences

Consider the seller's problem of finding optimal prices for her $n$ (divisible) goods when faced with a set of $m$ consumers, given that she can only observe their purchased bundles at posted prices, i.e., revealed preferences. We study both social welfare and profit maximization with revealed preferences. Although social welfare maximization is a seemingly non-convex optimization problem in prices, we show that (i) it can be reduced to a dual convex optimization problem in prices, and (ii) the revealed preferences can be interpreted as supergradients of the concave conjugate of valuation, with which subgradients of the dual function can be computed. We thereby obtain a simple subgradient-based algorithm for strongly concave valuations and convex cost, with query complexity $O(m^2/\epsilon^2)$, where $\epsilon$ is the additive difference between the social welfare induced by our algorithm and the optimum social welfare. We also study social welfare maximization under the online setting, specifically the random permutation model, where consumers arrive one-by-one in a random order. For the case where consumer valuations can be arbitrary continuous functions, we propose a price posting mechanism that achieves an expected social welfare up to an additive factor of $O(\sqrt{mn})$ from the maximum social welfare. Finally, for profit maximization (which may be non-convex in simple cases), we give nearly matching upper and lower bounds on the query complexity for separable valuations and cost (i.e., each good can be treated independently)

Dissolved organic matter quantity and quality in Lake Simcoe compared to two other large lakes in southern Ontario

Dissolved organic matter (DOM) is a critical component in ecosystem processes and is the largest pool of organic carbon (C) in aquatic environments. In this study, we investigated the variability in quantity and quality of DOM in 3 large lakes in southern Ontario. Water quality parameters were coupled with excitation emission fluorescence spectroscopy and absorption spectra to characterize the DOM and investigate the overarching factors controlling DOM dynamics. The results show that Lake Simcoe has higher dissolved organic carbon (DOC) concentrations than lakes Erie, Ontario, and Hamilton Harbour (an embayment in western Lake Ontario) and suggest that a DOM source independent of watershed inputs is likely an important contributor to the DOC in this system. Five components were identified through parallel factor analysis (PARAFAC), representative of both terrestrial and microbial origin. Their relative intensities in the 4 Lake Simcoe end-members allowed the identification of dominant DOM sources in our studied ecosystems. Lake Simcoe seems to have a similar contribution of agriculturally derived DOM to lakes Erie, Ontario, and Hamilton Harbour. Lake Ontario, including Hamilton Harbour had on average a larger input of DOM derived from wastewater treatment plant effluents. The seasonal patterns in the different optical characteristics of DOM in Lake Simcoe compared to other systems suggested that DOM qualitative transformations, be it through photooxidation or microbial degradation, are likely very important processes in this lake. The role of DOM in Lake Simcoe may have important ecological implications for the cycling of C and the oxygen regime of this lake.&nbsp

The electrophysiology of the betacell based on single transmembrane protein characteristics

The electrophysiology of betacells is at the origin of insulin secretion. Betacells exhibit a complex behaviour upon stimulation with glucose including repeated and uninterrupted bursting. Mathematical modelling is most suitable to improve knowledge about the function of various transmembrane currents provided the model is based on reliable data. This is the first attempt to build a mathematical model for the betacell-electrophysiology in a bottom-up approach which relies on single protein conductivity data. The results of previous whole-cell-based models are reconsidered. The full simulation including all prominent transmembrane proteins in betacells is used to provide a functional interpretation of their role in betacell-bursting and an updated vantage point of betacell-electrophysiology. As a result of a number of in silico knock-out- and block-experiments the novel model makes some unexpected predictions: Single-channel conductivity data imply that calcium-gated potassium currents are rather small. Thus, their role in burst interruption has to be revisited. An alternative role in high calcium level oscillations is proposed and an alternative burst interruption model is presented. It also turns out that sodium currents are more relevant than expected so far. Experiments are proposed to verify these predictions.Comment: 28 pages, 5 figures, 54 references, 14 pages supplementary materia

Dimensionando e caracterizando a agricultura familiar no circuito das frutas, São Paulo.

O perfil da agricultura familiar no Circuito das Frutas, Estado de São Paulo, no ano de 2018, foi analisado e tendo como material empírico 1.373 declarações de aptidão ao PRONAF subdivididas em três situações diferentes: DAPs ativas, expiradas e canceladas. Os resultados mostraram que os fruticultores totalizaram 798. Observou-se que o número de DAPs com prazos de validade vencidos (61,4%) supera as ativas (33,7%). Para as três situações, observou-se que a maioria dos fruticultores não são socialmente organizados; quanto a renda bruta do imóvel com frutíferas verificaram-se diferenças entre os estratos com predomínio de 30,5% das ativas, entre 30 a 60 mil reais e das canceladas, entre 60 e 90 mil reais (35,7%), bem distante do limite de 415 mil reais definido pelo Conselho Monetário. Ações dos agentes locais se fazem necessárias para resgatar os produtores com DAPs expiradas para o universo de agricultores familiares, bem como a orientação aos produtores sobre as vantagens de se vincularem a associações e cooperativas a fim de garantir melhores condições na compra de insumos e abertura de canais de comercialização para sua produção.Publicado também em: In: CONGRESSO DA SOCIEDADE BRASILEIRA DE ECONOMIA, ADMINISTRAÇÃO E SOCIOLOGIA RURAL, 57., 2019, Ilhéus. Agricultura, alimentação e desenvolvimento: anais eletrônicos. Ilhéus: SOBER, 2019. Disponível em:

Emergent global oscillations in heterogeneous excitable media: The example of pancreatic beta cells

Using the standard van der Pol-FitzHugh-Nagumo excitable medium model I demonstrate a novel generic mechanism, diversity, that provokes the emergence of global oscillations from individually quiescent elements in heterogeneous excitable media. This mechanism may be operating in the mammalian pancreas, where excitable beta cells, quiescent when isolated, are found to oscillate when coupled despite the absence of a pacemaker region.Comment: See home page http://lec.ugr.es/~julya

Molecular phylogeny of Mexican species of freshwater prawn genus Macrobrachium (Decapoda: Palaemonidae: Palaemoninae)

Molecular phylogenetic analyses of 16 species of the freshwater prawn genus Macrobrachium from Mexico are presented. The phylogenetic reconstructions are based on partial sequences from16S rDNA mitochondrial gene. The results show a clear separation of the species with extended larval development (ED) from those with abbreviated larval development (AD). Within the ED clade, the species of the Olfersii Group clustered together, which is in agreement with their morphological similarity, whereas the position of the three pairs of geminate species within this clade suggests different origins. Five Mexican species are grouped into a single clade suggesting a common origin in a species with few larval stages and relatively large eggs. The estimated time of evolutionary divergence suggests that the ED and AD clades diverged in the Middle Eocene; the three geminate pairs differentiated at different times, and the species of the AD group originated during the Early Pliocene

Desarrollo de competencias para la exportación

Este documento hace una recopilación de las diferentes etapas para la exportación del producto seleccionado, que fueron desarrolladas en un plan de negocio. La Empresa es el primer eslabón, el cual está integrado por la información general de la misma, situación financiera y su orientación a la conciencia exportadora. Actualmente la empresa Gricha se encuentra operando en Guadalajara y por medio de su página en línea con cobertura a toda la República Mexicana. La Integración de la Oferta Exportable, está conformada por las especificaciones del producto a exportar, su proceso productivo, la capacidad de producción total, así como la composición de sus costos y precios. El producto son galletas con proteína elaboradas a base de harina de chapulín y tienen como objetivo ser un bocadillo saludable a comparación de otros snacks El mercado meta consiste en buscar qué país es el adecuado para la exportación del producto, mediante una investigación de mercado de escritorio con fuentes secundarias y la generación de estrategias de comercialización. La parte logística consiste en desarrollar todo el andamiaje necesario para que se pueda exportar el producto, por medio de una estructura que abarca desde el medio de transporte hasta los aranceles e impuestos que se deben pagar para que el producto llegue al país destino. La parte legal consiste en todos los aspectos que se requieren para la exportación, contrato de transporte, seguro, arbitraje internacional, cobranza y formas de pago establecidas entre el vendedor y el comprador. La parte financiera requiere establecer todos los costos que se genera el proceso de exportación, así como estados financieros de la empresa, rentabilidad y proyección financiera del mercado al que se quiere incursionar.ITESO, A.C