501 research outputs found

    A Sequence-Analysis Approach to the Study of the Transition to Adulthood in Low- and Middle-Income Countries

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    This study investigates whether young people in low- and middle-income countries (LMICs) have experienced processes of destandardization of the life course similar to those observed in high-income societies. We provide two contributions to the relevant literature. First, we use data from 263 Demographic and Health Surveys (DHS) across 69 LMICs, offering the richest comparative account to date of women's transition to adulthood (TTA) patterns in the developing world. In so doing, we adopt sequence analysis and shift the focus from individual life-course events—namely first sexual intercourse, first union, and first birth—to a visually appealing approach that allows us to describe interrelations among events. By focusing on the analysis of trajectories rather than the occurrence of single events, the study provides an in-depth focus on the timing of events, time intervals between events, and how experiencing (or not) one event might have consequences for subsequent markers in the TTA in cross-national comparative perspective. Second, we identify clusters of TTA and explore their changes across cohorts by region and household location of residence (rural vs. urban). We document significant differences by macro-regions, yet relative stability across cohorts. We interpret the latter as suggestive of cultural specificities that make the TTA resistant to change and slow to converge across regions, if converging at all. Also, we find that much of the difference across cluster typologies ensues from variation related to when the transition begins (early vs. late), rather than from the duration between events, which tends to be uniformly quick across three out of four clusters

    Abitare a Elea: l'area dell'Acropoli

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    Il contributo analisi la documentazione dell'architettura domestica a Elea in età tardo arcaica

    Gli enti di ricerca torinesi e gli strumenti tecnico-scientifici a servizio della collettività

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    Il saggio propone un approfondimento sulle proposte e soluzioni che nascono dalla sperimentazione e dallo studio di strumenti e oggetti pratici sviluppati in seno al Politecnico (allora composto in Scuola di applicazione per Ingegneri e Museo Industriale Nazionale) e all’Università di Torino per affrontare i temi dell’abitazione sociale, dell’arredo urbano e dei primi servizi messi a disposizione per la popolazione per contrastare la mortalità e aumentare il benessere sociale (dagli Uffici d’igiene, al dispensario per lattanti alla prima scuola popolare di igiene tutti nati a Torino a cavallo dei due secoli)

    Declining quantity and quality of births in Chile amidst the COVID-19 pandemic

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    The version of record for this working paper is: Pesando, L. M., & Abufhele, A. (2022). Declining quantity and quality of births in Chile amidst the COVID-19 pandemic. Population and Development Review, 50(51), pp. 75-99. https://doi.org/10.1111/padr.12541Extensive demographic scholarship shows that the population-level implications of mortality crises such as the COVID-19 pandemic extend beyond mortality dynamics to affect fertility and family-formation strategies. Using novel municipality-level data from Chile covering all births that occurred between January 2017 and December 2021, this study explores trends in fertility and implications of the COVID-19 pandemic for “quantum” and “quality” of births in the Chilean context. Building both a monthly and a yearly panel of 346 municipalities and leveraging fixed-effects regression analyses, we focus on births and Crude Birth Rates (CBRs) to measure quantum, while quality is assessed through the share of births that are low-weight (LBW) and preterm (PTB). Our findings provide evidence of a significant drop in fertility in the wake of COVID – of the magnitude of a reduction of 1.3 live births per 1,000 individuals – which reaches a minimum around February 2021, followed by an incipient rebound in late 2021. Moreover, estimates on child health at birth suggest that the COVID period was associated with an increase in LBW and, foremost, PTB, by 1 and 2.2 percentage points, respectively. Findings from this study shed light on the role of policy interventions in the health arena and the linkages between short- and long-run effects in relation to the various COVID-19 waves

    Correlators of arbitrary untwisted operators and excited twist operators for N branes at angles

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    AbstractWe compute the generic correlator with L untwisted operators and N (excited) twist fields for branes at angles on T2 and show that it is given by a generalization of the Wick theorem. We give also the recipe to compute efficiently the generic OPE between an untwisted operator and an excited twisted state

    Canonical quantization of a string describing N branes at angles

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    AbstractWe study the canonical quantization of a bosonic string in presence of N twist fields. This generalizes the quantization of the twisted string in two ways: the in and out states are not necessarily twisted and the number of twist fields N can be bigger than 2.In order to quantize the theory we need to find the normal modes. Then we need to define a product between two modes which is conserved. Because of this we need to use the Klein–Gordon product and to separate the string coordinate into the classical and the quantum part. The quantum part has different boundary conditions than the original string coordinates but these boundary conditions are precisely those which make the operator describing the equation of motion self adjoint.The splitting of the string coordinates into a classical and quantum part allows the formulation of an improved overlap principle. Using this approach we then proceed in computing the generating function for the generic correlator with L untwisted operators and N (excited) twist fields for branes at angles. We recover as expected the results previously obtained using the path integral. This construction explains why these correlators are given by a generalization of the Wick theorem
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