Computing optimal shortcuts for networks

We augment a plane Euclidean network with a segment or shortcut to minimize the largest distance between any two points along the edges of the resulting network. In this continuous setting, the problem of computing distances and placing a shortcut is much harder as all points on the network, instead of only the vertices, must be taken into account. Our main result for general networks states that it is always possible to determine in polynomial time whether the network has an optimal shortcut and compute one in case of existence. We also improve this general method for networks that are paths, restricted to using two types of shortcuts: those of any fixed direction and shortcuts that intersect the path only on its endpoints.Peer ReviewedPostprint (published version

Computing optimal shortcuts for networks

We study augmenting a plane Euclidean network with a segment, called shortcut, to minimize the largest distance between any two points along the edges of the resulting network. Questions of this type have received considerable attention recently, mostly for discrete variants of the problem. We study a fully continuous setting, where all points on the network and the inserted segment must be taken into account. We present the first results on the computation of optimal shortcuts for general networks in this model, together with several results for networks that are paths, restricted to two types of shortcuts: shortcuts with a fixed orientation and simple shortcuts.Peer ReviewedPostprint (published version

Implementación y configuración bajo nethserver solucionando necesidades especificas con GNU/Linux

Este articulo es presentado para demostrar a través de una serie de imágenes la instalación y configuración de GNU/Linux Nethserver, siendo este un sistema operativo una base para disponer de los servicios de infraestructura IT. Se realiza una configuración previa de Nethserver y red, para el desarrollo de distintas temáticas que manejan temas como DHCP, DNS y Controlador de dominio, Proxy, Cortafuegos, File Server y Print Server, y por ultimo VPN. En la ejecución de estos temas se instalaron y configuraron aplicaciones fundamentales para el desarrollo de estas y se obtuvieron resultados favorables entorno a lo solicitado; de esta manera dejando en evidencia unos breves escritos los cuales detallan paso a paso el desarrollo.This article is presented to demonstrate through a series of images the installation and configuration of GNU/Linux Nethserver, this being an operating system that is the basis for having IT infrastructure services. A prior configuration of Nethserver and network is carried out, for the development of different themes that handle topics such as DHCP, DNS and Domain Controller, Proxy, Firewall, File Server and Print Server, and finally VPN. In the execution of these topics, fundamental applications for their development were installed and configured and favorable results were obtained in the requested environment; in this way revealing some brief writings which detail the development step by step

Remediación de suelos del botadero cerro San Cristóbal mediante los microorganismos (Bacillus cereus) en Pampas Tayacaja

The objective of this article is to restore soil contaminated by dumps through the microorganism Bacillus cereus. The methodology includes 5 samples of soils contaminated by dumps, where experiments will be carried out, which will be mutually contrasted and it will be determined if the bioremediation microorganism is efficient or not for the restoration of contaminated soil. The results show that a bad practice in solid waste management are illegal dumps that cause soil contamination, this problem afflicts the district of Pampas, specifically in the San Cristóbal hill, in the investigation a sample of the hill was analyzed San Cristóbal where the initial pH, temperature and texture is 7.5 pH, 22 C ° and clayey, respectively, through the remediation method with the Bacillus cereus bacterium, the pH changes and drops to 6.6 pH, the temperature also changes to 21 ° and the texture changes to loamy-sandy, these as final results. Conclusion, it was possible to verify that the Bacillus cereus bacterium shows favorable results for the inhibition of contaminants from solid waste, that is, they are good restorers of contaminated soils, for this reason it was achieved that the pH, temperature and texture change favorably.El objetivo de este artículo es restaurar el suelo contaminado por botaderos mediante el microorganismo Bacillus cereus. La metodología, comprende 5 muestras de suelos contaminados por botaderos, donde se realizarán experimentos, los cuales serán contrastados mutuamente y se determinará si el microorganismo biorremediador es eficiente o no para la restauración de un suelo contaminado. En los resultados muestra, que una mala práctica del manejo de residuos sólidos son los botaderos ilegales que ocasiona una contaminación de los suelos, este problema aqueja el distrito de Pampas, específicamente en el cerro San Cristóbal, en la investigación se analizó  una muestra del cerro San Cristóbal donde el pH, temperatura y textura  inicial es de 7.5 pH , 22 C° y arcillosa,  respectivamente, mediante el método de remediación  con la bacteria Bacillus cereus  el pH permuta y baja a 6.6 pH, la temperatura también cambia  a 21° y la textura cambia a franco-arenosa, estos como resultados finales. Conclusión, se logró comprobar que la bacteria Bacillus cereus, muestra resultados favorables para la inhibición de contaminantes procedentes de los residuos sólidos, es decir, son buenos restauradores de suelos contaminados, por ello se logró que el pH, temperatura y textura cambien favorablemente

Global Self-Organization of the Cellular Metabolic Structure

Background: Over many years, it has been assumed that enzymes work either in an isolated way, or organized in small catalytic groups. Several studies performed using "metabolic networks models'' are helping to understand the degree of functional complexity that characterizes enzymatic dynamic systems. In a previous work, we used "dissipative metabolic networks'' (DMNs) to show that enzymes can present a self-organized global functional structure, in which several sets of enzymes are always in an active state, whereas the rest of molecular catalytic sets exhibit dynamics of on-off changing states. We suggested that this kind of global metabolic dynamics might be a genuine and universal functional configuration of the cellular metabolic structure, common to all living cells. Later, a different group has shown experimentally that this kind of functional structure does, indeed, exist in several microorganisms. Methodology/Principal Findings: Here we have analyzed around 2.500.000 different DMNs in order to investigate the underlying mechanism of this dynamic global configuration. The numerical analyses that we have performed show that this global configuration is an emergent property inherent to the cellular metabolic dynamics. Concretely, we have found that the existence of a high number of enzymatic subsystems belonging to the DMNs is the fundamental element for the spontaneous emergence of a functional reactive structure characterized by a metabolic core formed by several sets of enzymes always in an active state. Conclusions/Significance: This self-organized dynamic structure seems to be an intrinsic characteristic of metabolism, common to all living cellular organisms. To better understand cellular functionality, it will be crucial to structurally characterize these enzymatic self-organized global structures.Supported by the Spanish Ministry of Science and Education Grants MTM2005-01504, MTM2004-04665, partly with FEDER funds, and by the Basque Government, Grant IT252-07

Combined searches for the production of supersymmetric top quark partners in proton-proton collisions at root s=13 TeV

A combination of searches for top squark pair production using proton-proton collision data at a center-of-mass energy of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 137 fb(-1) collected by the CMS experiment, is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, or 2 leptons. New results for regions of parameter space where the kinematical properties of top squark pair production and top quark pair production are very similar are presented. Depending on themodel, the combined result excludes a top squarkmass up to 1325 GeV for amassless neutralino, and a neutralinomass up to 700 GeV for a top squarkmass of 1150 GeV. Top squarks with masses from 145 to 295 GeV, for neutralino masses from 0 to 100 GeV, with a mass difference between the top squark and the neutralino in a window of 30 GeV around the mass of the top quark, are excluded for the first time with CMS data. The results of theses searches are also interpreted in an alternative signal model of dark matter production via a spin-0 mediator in association with a top quark pair. Upper limits are set on the cross section for mediator particle masses of up to 420 GeV

Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at root s=13 TeV

A search is presented for new particles produced at the LHC in proton-proton collisions at root s = 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb(-1), collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb(-1), collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.Peer reviewe

Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at root s=13 TeV

Peer reviewe

Measurements of the Electroweak Diboson Production Cross Sections in Proton-Proton Collisions at root s=5.02 TeV Using Leptonic Decays

The first measurements of diboson production cross sections in proton-proton interactions at a center-of-mass energy of 5.02 TeV are reported. They are based on data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 302 pb(-1). Events with two, three, or four charged light leptons (electrons or muons) in the final state are analyzed. The WW, WZ, and ZZ total cross sections are measured as sigma(WW) = 37:0(-5.2)(+5.5) (stat)(-2.6)(+2.7) (syst) pb, sigma(WZ) = 6.4(-2.1)(+2.5) (stat)(-0.3)(+0.5)(syst) pb, and sigma(ZZ) = 5.3(-2.1)(+2.5)(stat)(-0.4)(+0.5) (syst) pb. All measurements are in good agreement with theoretical calculations at combined next-to-next-to-leading order quantum chromodynamics and next-to-leading order electroweak accuracy