The impact of new technologies over the city “explosion”.

It has been argued that new information and communications technologies (ICT) have been fundamental for urban expansion. Also, from the late sixties until the end of the past millennium, the “dead of the city” had been heralded .Throughout this theoretical paper, we review literature concerning the impact that new technologies have had over the metropolization process, debunking some premises and exemplifying the spatial transformations. The first part analyses the dispersion /concentration potential inherent to ICT. The second part highlights the importance and legitimacy of face -to - face relationships that allow urban agglomerations to be in force. Finally, we enlist new research lines that relates ICT with cities

Supporting Catholic Education through Effective School/University Partnerships: Two Models from the 2012 Catholic Higher Education Collaborative Conference

The following article contains two essays based on presentations to the 2012 CHEC conference on Catholic school governance held at Marquette University in October 2012. The essays outline two models of deep collaboration between Catholic institutions of higher education and Catholic K-12 schools designed to support and foster improvements in Catholic education. The first essay, “Higher Education Working Together to Help Catholic Schools: The Greater Milwaukee Catholic Education Consortium,” written by William A. Henk and Jennifer A. Maney, provides an overview of the Greater Milwaukee Catholic Education Consortium (GMCEC), an ongoing collaborative effort between the archdiocese of Milwaukee and the region’s five Catholic colleges and universities. Building a strong partnership among multiple institutions has allowed the GMCEC to leverage the individual strengths of each member institution to provide a variety of supports to Catholic schools within the diocese. The essay outlines the early history of the collaboration, the key areas of engagement, and some emerging outcomes and ongoing challenges associated with efforts to scaffold supports for diocesan schools. Following this essay are excerpts from a panel discussion among the five presidents of the institutions of higher education that are part of the consortium

Sidon-Ramsey and BhB_{h}-Ramsey numbers

For a given positive integer $k$, the Sidon-Ramsey number \SR(k) is defined as the minimum value of $n$ such that, in every partition of the set $[1, n]$ into $k$ parts, there exists a part that contains two distinct pairs of numbers with the same sum. In other words, there is a part that is not a Sidon set. In this paper, we investigate the asymptotic behavior of this parameter and two generalizations of it. The first generalization involves replacing pairs of numbers with $h$-tuples, such that in every partition of $[1, n]$ into $k$ parts, there exists a part that contains two distinct $h$-tuples with the same sum. Alternatively, there is a part that is not a $B_h$ set. The second generalization considers the scenario where the interval $[1, n]$ is substituted with a non-necessarily symmetric $d$-dimensional box of the form $\prod_{i=1}^d[1,n_i]$. For the general case of $h\geq 3$ and non-symmetric boxes, before applying our method to obtain the Ramsey-type result, we needed to establish an upper bound for the corresponding density parameter.Comment: 11 page

Acknowledgement of priority - A fractional Helly theorem for boxes

In our recent paper [1] we prove a fractional Helly type theorem for boxes in Rd. This short note is to acknowledge priority: in 1980 Meir Katchalski [4] proved exactly the same result and in 1988 Jürgen Eckhoff [2] proved the same result in much more generality. In fact, Eckhoff established an upper bound theorem for the f -vectors of finite families of boxes in Rd from which his result is derived. Besides apologies for our ignorance we would like to mention that Eckhoff extended his results further in a more recent paper [3]

Effect of equivalent sites on the dynamics of bimetallic nanoparticles

Using a Sutton and Chen interatomic potential, we study the molecular dynamics of Au- Pd nanoparticles with an initial icosahedral structure at different temperatures and concentrations, where each relative concentration of the 561-atom particles was made by placing atoms of the same species at equivalent sites, in order to identify under which conditions the melting transition temperature appears for each particle. In addition, we compute global order parameters in order to correlate the obtained results with the caloric curves of each particle. As a result, we observe that the melting transition temperature depends on the relative atomic positions of gold and palladium. The melting transition temperature of the Au-Pd alloy particles appears at higher temperature than that of the pure-gold particle. From the analysis of the structure of the particles, we found that the melting temperature increases with the proportion of gold atoms, and for those particles with a higher concentration of palladium on the surface, we observe an early migration of gold atoms before the melting transition temperature appears

Coreografías de servicios: una adaptación para dispositivos ubicuos

En la actualidad, las actividades cotidianas del hombre se han hecho dependientes de una gran cantidad de dispositivos electrónicos tales como: ordenadores personales, ordenadores portátiles, teléfonos móviles, PDAs, tabletas, sensores de muchas y diversas utilidades, entre otros; los cuales logran comunicarse entre sí gracias a diversos protocolos de comunicación inalámbrica, redes de celulares, redes de área local (LAN), redes de área extensa (WAN), Bluetooth, etc. Estamos en la presencia de nuevos dispositivos de comunicación, lo que conlleva un nuevo escenario social, donde la interacción permanente con estos elementos es ineludible. En casi todos los casos, los dispositivos ubicuos no proporcionan servicios de forma aislada, sino que deben cooperar con otros dispositivos. Actualmente, los mecanismos de cooperación disponibles son fundamentalmente de tipo propietario, y las pocas propuestas provenientes de la academia no han tenido apenas impacto en la práctica. Nuestra propuesta es adaptar y aplicar las especificaciones de coreografías actualmente existentes en SOA para la coordinación de servicios proporcionados por dispositivos ubicuos. Para poder cumplir con el objetivo de tesis planteado se utilizará como metodología de investigación design science, ya que es la que mejor se adapta a la naturaleza del problema, planteando como uno de sus lineamientos la construcción de artefactos y su posterior evaluación. En nuestro caso, el artefacto a construir sería: una especificación de coreografías adaptado a los dispositivos ubicuos y un framework que implementa dicha especificación al nivel de prueba de concepto.Eje: Ingeniería de Software.Red de Universidades con Carreras en Informátic

Photochemistry of the PAH pyrene in water ice: the case for ion-mediated solid-state astrochemistry

Context. Icy dust grains play an important role in the formation of complex inter- and circumstellar molecules. Observational studies show that polycyclic aromatic hydrocarbons (PAHs) are abundantly present in the ISM in the gas phase. It is likely that these non-volatile species freeze out onto dust grains as well and participate in the astrochemical solid-state network, but experimental PAH ice studies are largely lacking. Methods. Near UV/VIS spectroscopy is used to track the in situ VUV driven photochemistry of pyrene containing ices at temperatures ranging from 10 to 125 K. Results. The main photoproducts of VUV photolyzed pyrene ices are spectroscopically identified and their band positions are listed for two host ices, \water and CO. Pyrene ionisation is found to be most efficient in \water ices at low temperatures. The reaction products, triplet pyrene and the 1-hydro-1-pyrenyl radical are most efficiently formed in higher temperature water ices and in low temperature CO ice. Formation routes and band strength information of the identified species are discussed. Additionally, the oscillator strengths of Py, Py^+ and PyH are derived and a quantitative kinetic analysis is performed by fitting a chemical reaction network to the experimental data. Conclusions. Pyrene is efficiently ionised in water ice at temperatures below 50 K. Hydrogenation reactions dominate the chemistry in low temperature CO ice with trace amounts of water. The results are put in an astrophysical context by determining the importance of PAH ionisation in a molecular cloud. The photoprocessing of a sample PAH in ice described in this manuscript indicates that PAH photoprocessing in the solid state should also be taken into account in astrochemical models.Comment: 11 pages, 8 figures, accepted for publication in A&