A scalable reliable instant messenger using the SD Erlang libraries

Erlang has world leading reliability capabilities, but while it scales extremely well within a single node, distributed Erlang has some scalability issues. The Scalable Distributed (SD) Erlang libraries have been designed to address the scalability limitations while preserving the reliability model, and shown to deliver significant performance benefits above 40 hosts using some relatively simple benchmarks. This paper compares the reliability and scalability of SD Erlang and distributed Erlang using an Instant Messaging (IM) server benchmark that is a far more typical Erlang application; a relatively large and sophisticated benchmark; has throughput as the key performance metric; and uses non-trivial reliability mechanisms. We provide a careful reliability evaluation using chaos monkey. The key performance results consider scenarios with and without failures on up to 17 server hosts (272 cores). We show that SD Erlang adds no performance overhead when all nodes are grouped in a single s_group. However, either adding redundant router nodes in distributed Erlang applications, or dividing a set of nodes into small s_groups in SD Erlang applications, have small negative impact. Both the distributed Erlang and SD Erlang IM tolerate failures and, up to the failure rates measured, the failures have no impact on throughput. The IM implementations show that SD Erlang preserves the distributed Erlang reliability properties and mechanisms

A Reliable Instant Messenger in Erlang: Design and Evaluation

This document describes the design and evaluation of two Erlang-based instant messenger systems using Distributed Erlang (D-Erlang) and Scalable Distributed Erlang (SD-Erlang). The purpose of these systems is to serve as real-world benchmarks to test the performance of the SD Erlang library

Quinoxaline chemistry. Part 8. 2-[anilino]-3- [carboxy]-6(7)-substituted quinoxalines as non classical antifolate agents. Synthesis and evaluation of in vitro anticancer, anti-HIV and antifungal activity

Thirty quinoxalines bearing a substituted anilino group on position 2, a carboethoxy or carboxy group on position 3 and a trifluoromethyl group on position 6 or 7 of the heterocycle were prepared in order to evaluate in vitro anticancer activity. Preliminary screening performed at NCI showed that most derivatives exhibited a moderate to strong growth inhibition activity on various tumor panel cell lines between 10-5 and 10-4 molar concentrations. Interesting selectivities were also recorded between 10-8 and 10-6 M for a few compounds. One single compound exhibited good activity against Candida Albicans

Transfer to the continuum calculations of quasifree (p,pn) and (p,2p) reactions

Nucleon removal (p, pn) and (p, 2p) reactions at intermediate energies have gained renewed attention in recent years as a tool to extract information from exotic nuclei. The information obtained from these experiments is expected to be sensitive to deeper portions of the wave function of the removed nucleon than knockout reactions with heavier targets. In this contribution, we present calculations for (p, 2p) and (p, pn) reactions performed within the so-called transfer to the continuum method (TR*). Results for stable and unstable nuclei are presented, and compared with experimental data, when availabl

Antropología Bergsoniana

En una época del desarrollo del pensamiento filosófico como la actual, en que el interés por la antropología filosófica adquiere siempre mayores proporciones, se puede preguntar si la filosofía no sólo cree que ha conquistado un nuevo terreno de investigación, o a lo menos nuevas y originales modalidades de interpretación de su eterno problema la existencia, sino que ella misma en su totalidad se reconoce como revestida de una nueva fisonomía: es decir, si la filosofía se apropia de una manera definitiva la nota específica de antropológica. De hecho algunos ensayos modernos, más que desarrollar una antropología filosófica, pretenden fijar los lineamientos de una filosofía antropológica; y no es posible desconocer en esto un aspecto luminoso de verdad. La filosofía es esencialmente una filosofía de la persona, de la vida y de sus problemas consubstanciales, como son la temporalidad, el dolor y la muert

Interplay of projectile breakup and target excitation in reactions induced by weakly bound nuclei

Reactions involving weakly bound nuclei require formalisms able to deal with continuum states. The majority of these formalisms struggle to treat collective excitations of the systems involved. For continuumdiscretized coupled channels (CDCC), extensions to include target excitation have been developed but have only been applied to a small number of cases.Junta de Andalucía FQM160 P07-FQM-02894Ministerio de Economía y Competitividad FIS2014-53448-C2-1-

Antropología Bergsoniana

En una época del desarrollo del pensamiento filosófico como la actual, en que el interés por la antropología filosófica adquiere siempre mayores proporciones, se puede preguntar si la filosofía no sólo cree que ha conquistado un nuevo terreno de investigación, o a lo menos nuevas y originales modalidades de interpretación de su eterno problema la existencia, sino que ella misma en su totalidad se reconoce como revestida de una nueva fisonomía: es decir, si la filosofía se apropia de una manera definitiva la nota específica de antropológica. De hecho algunos ensayos modernos, más que desarrollar una antropología filosófica, pretenden fijar los lineamientos de una filosofía antropológica; y no es posible desconocer en esto un aspecto luminoso de verdad. La filosofía es esencialmente una filosofía de la persona, de la vida y de sus problemas consubstanciales, como son la temporalidad, el dolor y la muert

Influence of target deformation and deuteron breakup in ( d , p ) transfer reactions

Background: The effect of core excitations in transfer reactions of the form A ( d , p ) B has been reexamined by some recent works by using the Faddeev–Alt–Grassberger–Sandhas reaction formalism. The effect was found to affect significantly the calculated cross sections and to depend strongly and nonlinearly on the incident deuteron energy. Purpose: Our goal is to investigate these effects within a coupled-channel formulation of the scattering problem which, in addition to being computationally less demanding than the Faddeev counterpart, may help shed some light onto the physical interpretation of the cited effects. Method: We use an extended version of the continuum-discretized coupled-channel (CDCC) method with explicit inclusion of target excitations within a coupled-channel Born approximation (CDCC-BA) formulation of the transfer transition amplitude. We compare the calculated transfer cross sections with those obtained with an analogous calculation omitting the effect of target excitation. We consider also an adiabatic coupled-channel (ACC) method. Our working example is the 10 Be ( d , p ) 11 Be reaction. Results: We find that the two considered methods (CDCC-BA and ACC) reproduce fairly well the reported energy dependence of the core excitation effect. The main deviation from the pure three-body model calculation (i.e., omitting core excitations) is found to mostly originate from the destructive interference of the direct one-step transfer and the two-step transfer following target excitation. Conclusions: The proposed method; namely, the combination of the CDCC method and the CCBA formalism, provides a useful and accurate tool to analyze transfer reactions including explicitly, when needed, the effect of target excitations and projectile breakup. The method could be useful for other transfer reactions induced by weakly bound projectiles, including halo nuclei.Ministerio de Economía y Competitividad de España y Fondos FEDER. FIS2014-53448-C2-1-PPrograma Horizonte 2020 de la Unión Europea. 65400

Influence of target deformation and deuteron breakup in ( d , p ) transfer reactions

Background: The effect of core excitations in transfer reactions of the form A ( d , p ) B has been reexamined by some recent works by using the Faddeev–Alt–Grassberger–Sandhas reaction formalism. The effect was found to affect significantly the calculated cross sections and to depend strongly and nonlinearly on the incident deuteron energy. Purpose: Our goal is to investigate these effects within a coupled-channel formulation of the scattering problem which, in addition to being computationally less demanding than the Faddeev counterpart, may help shed some light onto the physical interpretation of the cited effects. Method: We use an extended version of the continuum-discretized coupled-channel (CDCC) method with explicit inclusion of target excitations within a coupled-channel Born approximation (CDCC-BA) formulation of the transfer transition amplitude. We compare the calculated transfer cross sections with those obtained with an analogous calculation omitting the effect of target excitation. We consider also an adiabatic coupled-channel (ACC) method. Our working example is the 10 Be ( d , p ) 11 Be reaction. Results: We find that the two considered methods (CDCC-BA and ACC) reproduce fairly well the reported energy dependence of the core excitation effect. The main deviation from the pure three-body model calculation (i.e., omitting core excitations) is found to mostly originate from the destructive interference of the direct one-step transfer and the two-step transfer following target excitation. Conclusions: The proposed method; namely, the combination of the CDCC method and the CCBA formalism, provides a useful and accurate tool to analyze transfer reactions including explicitly, when needed, the effect of target excitations and projectile breakup. The method could be useful for other transfer reactions induced by weakly bound projectiles, including halo nuclei.Ministerio de Economía y Competitividad de España y Fondos FEDER. FIS2014-53448-C2-1-PPrograma Horizonte 2020 de la Unión Europea. 65400

Investment behaviour of EU arable crop farms in selected EU countries and the impact of policy reforms. Factor Markets Working Document No. 42, May 2013

This deliverable provides a comparative analysis, among selected EU member states, of the investment demand of a sample of specialised field crop farms for farm buildings, machinery and equipment as determined by different types and levels of Common Agricultural Policy support. It allows for the existence of uncertainty in the price of output farmers receive and for both long- and short-run determinants of investment levels, as well as for the presence of irregularities in the cost adjustment function due to the existence of threshold-type behaviours. The empirical estimation reveals that three investment regimes are consistently identified in Germany and Hungary, across asset and support types, and in France for machinery and equipment. More traditional disinvestment-investment type behaviours characterise investment in farm building in France and the UK, across support types, and Italy for both asset classes under coupled payments. The long-run dynamic adjustment of capital stocks is consistently and significantly estimated to be towards a – mostly non-stationary – lower level of capitalisation of the farm analysed. By contrast, the expected largely positive short-run effects of an increase in output prices are often not significant. The effect of CAP support on both types of investment is positive, although seldom significant, while the proxy for uncertainty employed fails to be significant yet, in most cases, has the expected effect of reducing the investment levels