1,707 research outputs found

    Disentangling the Impact of International Migration on Food and Nutrition Security of Left-Behind Households: Evidence from Bangladesh

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    This paper explores the linkages between international migration and household food and nutrition security (FNS). First, building on existing literature, we discuss the main microeconomic channels through which international migration may affect household FNS. Second, taking Bangladesh as a case study, we estimate the overall impact of international migration on the FNS of left-behind households. Third, by disentangling the overall effect, we assess the importance of the various microeconomic channels that link international migration to household FNS. The empirical results suggest that international migration has a positive impact on the quantity, quality and variety of food consumed by left-behind households. Our findings also suggest that international migration might be considered among the possible drivers of the so-called Bangladesh paradox, i.e. the exceptional progress in health and nutrition achieved by the country during a period of relatively poor economic performance

    Database MISIT (Mappatura delle Informazioni di Strutture e Infrastrutture sul Territorio)

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    Nuovo sistema di database con strumenti GIS e BIM per la gestione intelligente e funzionale di risorse sul territorio. Applicazione a progetto pilota sul territorio della città di Roma.The project scope of this paper is to show how to use the cutting-edges informatics technologies for buildings and infrastructures. In fact GIS (Geographic Information System) and BIM (Building Information Modeling) are extremely useful to "build" a intelligent and functional database with geographic information. It is possible to use this method for existing structures/infrastructures or for their design, and this is essential to manage in a good way the resources on the territory. It is described a research project for the Municipality V of the city of Rome and ideas for future uses

    An update on maternal hydration strategies for amniotic fluid improvement in isolated oligohydramnios and normohydramnios: Evidence from a systematic review of literature and meta-analysis

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    open8Objective Several trials aimed at evaluating the efficacy of maternal hydration (MH) in increasing amniotic-fluid-volume (AFV) in pregnancies with isolated oligohydramnios or normohydramnos have been conducted. Unfortunately, no evidences support this intervention in routineclinical- practice. The aim of this systematic-literature-review and meta-analysis was to collect all data regarding proposed strategies and their efficacy in relation to each clinical condition for which MH-therapy was performed with the aim of increasing amniotic-fluid (AF) and improving perinatal outcomes. Materials and Methods A systematic literature search was conducted in electronic-database MEDLINE, EMBASE, ScienceDirect and the Cochrane-Library in the time interval between 1991 and 2014. Following the identification of eligible trials, we estimated the methodological quality of each study (using QADAS-2) and clustered patients according to the following outcome measures: route of administration (oral versus intravenous versus combined), total daily dose of fluids administered (2000), duration of hydration therapy: (1 day, >1 day but 1 week), type of fluid administered (isotonic versus hypotonic versus combination). Results In isolated-oligohydramnios (IO), maternal oral hydration is more effective than intravenous hydration and hypotonic solutions superior to isotonic solutions. The improvement in AFV appears to be time-dependent rather than daily-dose dependent. Regarding normohydramnios pregnancies, all strategies seem equivalent though the administration of hypotonicfluid appears to have a slightly greater effect than isotonic-fluid. Regarding perinatal outcomes, data is fragmentary and heterogeneous and does not allow us to define the real clinical utility of MH. Conclusions Available data suggests that MH may be a safe, well-tolerated and useful strategy to improve AFV especially in cases of IO. In view of the numerous obstetric situations in which a reduced AFV may pose a threat, particularly to the fetus, the possibility of increasing AFV with a simple and inexpensive practice like MH-therapy may have potential clinical applications. Considering the various strategies of maternal hydration implemented in the treatment of IO, better results were observed when treatment was based on a combination of intravenous (for a period of 1 day) and oral (for a period of at least 14 days) hypotonic fluids (≥2000ml).openGizzo, Salvatore; Noventa, Marco; Vitagliano, Amerigo; Dall'Asta, Andrea; D'Antona, Donato; Aldrich, Clive J.; Quaranta, Michela; Frusca, Tiziana; Patrelli, Tito SilvioGizzo, Salvatore; Noventa, Marco; Vitagliano, Amerigo; Dall'Asta, Andrea; D'Antona, Donato; Aldrich, Clive J.; Quaranta, Michela; Frusca, Tiziana; Patrelli, Tito Silvi

    Search for supersymmetry in pp collisions at s\sqrt{s} = 13 tev in the single-lepton final state using the sum of masses of large-radius jets

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    Results are reported from a search for supersymmetric particles in proton-proton collisions in the final state with a single lepton, multiple jets, including at least one b-tagged jet, and large missing transverse momentum. The search uses a sample of proton-proton collision data at s\sqrt{s} = 13 TeV recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9  fb−1fb^{−1}. The observed event yields in the signal regions are consistent with those expected from standard model backgrounds. The results are interpreted in the context of simplified models of supersymmetry involving gluino pair production, with gluino decay into either on- or off-mass-shell top squarks. Assuming that the top squarks decay into a top quark plus a stable, weakly interacting neutralino, scenarios with gluino masses up to about 1.9 TeV are excluded at 95% confidence level for neutralino masses up to about 1 TeV

    Search for dark matter produced in association with heavy-flavor quark pairs in proton-proton collisions at s\sqrt{s} = 13 TeV

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    A search is presented for an excess of events with heavy-flavor quark pairs (tt‾t\overline{t} and bb‾b\overline{b}) and a large imbalance in transverse momentum in data from proton–proton collisions at a center-of-mass energy of 13TeV. The data correspond to an integrated luminosity of 2.2 fb−1fb^{−1} collected with the CMS detector at the CERN LHC. No deviations are observed with respect to standard model predictions. The results are used in the first interpretation of dark matter production in tt‾t\overline{t} and bb‾b\overline{b} final states in a simplified model. This analysis is also the first to perform a statistical combination of searches for dark matter produced with different heavy-flavor final states. The combination provides exclusions that are stronger than those achieved with individual heavy-flavor final states

    Search for black holes in high-multiplicity final states in proton-proton collisions at s=13\sqrt{s}=13 TeV

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    A search for new physics in energetic, high-multiplicity final states has been performed using proton-proton collision data collected with the CMS detector at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 2.3 fb−1^{−1}. The standard model background, dominated by multijet production, is determined exclusively from control regions in data. No statistically significant excess of events is observed. Model-independent limits on the product of the cross section and the acceptance of a new physics signal in these final states are set and further interpreted in terms of limits on the production of black holes. Semiclassical black holes and string balls with masses as high as 9.5 TeV, and quantum black holes with masses as high as 9.0 TeV are excluded by this search in the context of models with extra dimensions, thus significantly extending limits set at a center-of-mass energy of 8 TeV with the LHC Run 1 data

    Combination of searches for heavy resonances decaying to WW, WZ, ZZ, WH, and ZH boson pairs in proton–proton collisions at s\sqrt{s} = 8 and 13 TeV

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    A statistical combination of searches is presented for massive resonances decaying to WW, WZ, ZZ, WH, and ZH boson pairs in proton–proton collision data collected by the CMS experiment at the LHC. The data were taken at centre-of-mass energies of 8 and 13 TeV, corresponding to respective integrated luminosities of 19.7 and up to 2.7 fb−1fb^{−1}. The results are interpreted in the context of heavy vector triplet and singlet models that mimic properties of composite-Higgs models predicting W′ and Z′ bosons decaying to WZ, WW, WH, and ZH bosons. A model with a bulk graviton that decays into WW and ZZ is also considered. This is the first combined search for WW, WZ, WH, and ZH resonances and yields lower limits on masses at 95% confidence level for W′ and Z′ singlets at 2.3 TeV, and for a triplet at 2.4 TeV. The limits on the production cross section of a narrow bulk graviton resonance with the curvature scale of the warped extra dimension k~=0.5\tilde{k}=0.5, in the mass range of 0.6 to 4.0 TeV, are the most stringent published to date

    The CMS trigger system

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    This paper describes the CMS trigger system and its performance during Run 1 of the LHC. The trigger system consists of two levels designed to select events of potential physics interest from a GHz (MHz) interaction rate of proton-proton (heavy ion) collisions. The first level of the trigger is implemented in hardware, and selects events containing detector signals consistent with an electron, photon, muon, Ï„ lepton, jet, or missing transverse energy. A programmable menu of up to 128 object-based algorithms is used to select events for subsequent processing. The trigger thresholds are adjusted to the LHC instantaneous luminosity during data taking in order to restrict the output rate to 100 kHz, the upper limit imposed by the CMS readout electronics. The second level, implemented in software, further refines the purity of the output stream, selecting an average rate of 400 Hz for offline event storage. The objectives, strategy and performance of the trigger system during the LHC Run 1 are described

    Search for single production of vector-like quarks decaying into a b quark and a W boson in proton-proton collisions at s=13\sqrt{s} = 13 TeV

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    A search is presented for a heavy vector-like quark, decaying into a b quark and a W boson, which is produced singly in association with a light flavor quark and a b quark. The analysis is performed using a data sample of proton–proton collisions at a center-of-mass energy of s=13\sqrt{s} = 13 TeV collected at the LHC in 2015. The data set used in the analysis corresponds to an integrated luminosity of 2.3 fb−1fb^{−1}. The search is carried out using events containing one electron or muon, at least one b-tagged jet with large transverse momentum, at least one jet in the forward region of the detector, and missing transverse momentum. No excess over the standard model prediction is observed. Upper limits are placed on the production cross section of heavy exotic quarks: a T quark with a charge of 2/3, and a Y quark with a charge of −4/3. For Y quarks with coupling of 0.5 and B(Y→bW)=100\mathcal{B}(Y→bW) = 100%, the observed (expected) lower mass limits are 1.40 (1.0)TeV. This is the most stringent limit to date on the single production of the Y vector-like quark
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