Use It or Lose It: Irish Evidence. ESRI WP531. April 2016

A small but growing body of research suggests that retirement and cognitive decline are related. In fact, some have argued that retirement causes cognitive decline. The aim of this paper is to add to this literature using data of older women from The Irish Longitudinal Study on Ageing (TILDA). Ordinary least square (OLS) regressions show a significant negative association between retirement duration - defined as time elapsed since last job ended - and cognition. This association is, however, very small when compared to the association of age or education with cognition. As retirement is potentially endogenous to cognition, instrumental variable (IV) methods are also used. The instrument employed is the abolition of the so-called “Marriage Bar”. In simple terms, the Marriage Bar was the requirement that women leave paid employment on getting married. It was established in the 1930s and removed in the 1970s. When IV estimations are used, the effect of retirement duration is statistically insignificant. Differences between OLS and IV estimates are compared with a standard test. OLS estimates are preferred as there is no statistical evidence that retirement duration is endogenous. As OLS estimates are very small, it is extremely unlikely that working into old age has much of an impact on slowing cognitive decline amongst older people

Use It or Lose It : Irish Evidence

A small but growing body of research suggests that retirement and cognitive decline are related. In fact, some have argued that retirement causes cognitive decline. The aim of this paper is to add to this literature using data of older women from The Irish Longitudinal Study on Ageing (TILDA). Ordinary least square (OLS) regressions show a significant negative association between retirement and cognitive functioning. These estimates are based on the assumption that retirement is exogenous. As retirement is potentially endogenous with respect to cognition, instrumental variable (IV) methods are also used. The instrument employed is the abolition of the so - called “Marriage Bar”. In simple terms, the Marriage Bar was the requirement that women leave paid employment on getting married. It was established in the 1930s and removed in the 1970s . When IV estimations are used, the effect of retirement on cognition is negative but statistically insignificant. Differences between OLS and IV estimates are compared with a standard test. OLS estimates are preferred as the null hypothesis of exogeneity of retirement cannot be rejected at conventional statistical levels

Photon Self-Induced Spin to Orbital Conversion in TGG crystal at high laser power

In this paper, we present experimental evidence of a newly discovered third-order nonlinear optical process Self-Induced Spin-to-Orbital Conversion (SISTOC) of the photon angular momentum. This effect is the physical mechanism at the origin of the depolarization of very intense laser beams propagating in isotropic materials. The SISTOC process, like self-focusing, is triggered by laser heating leading to a radial temperature gradient in the medium. In this work we tested the occurrence of SISTOC in a terbium gallium garnet (TGG) rod for an impinging laser power of about 100~W. To study the SISTOC process we used different techniques: polarization analysis, interferometry and tomography of the photon orbital angular momentum. Our results confirm, in particular, that the apparent depolarization of the beam is due to the occurrence of maximal entanglement between the spin and orbital angular momentum of the photons undergoing the SISTOC process. This explanation of the true nature of the depolarization mechanism could be of some help in finding novel methods to reduce or to compensate for this usually unwanted depolarization effect in all cases where very high laser power and good beam quality are required.Comment: 6 pages, 10 figures, submitte

The long-term consequences of the Irish marriage bar

A Marriage Bar is the requirement that women in certain jobs must leave that job when they marry. Ireland had a Marriage Bar in place until the 1970s. In 2014/2015, women participating in the The Irish Longitudinal Study on Ageing were asked – for the first time in a nationally representative survey – specific questions about their experience of the Marriage Bar. In this paper, we use the information from the TILDA respondents for two purposes. The first is to investigate the extent of the Marriage Bar in Ireland. Our analysis suggests that the Marriage Bar was widespread and not confined to specific sectors or occupations (such as the civil service). The second purpose is to investigate the long-term consequences of the Marriage Bar. We do so by comparing the outcomes of women who were affected by the Marriage Bar with the outcomes of women who were not affected by the Marriage Bar. Regression analysis shows that women affected by the Marriage Bar have shorter working lives, lower individual income but higher household wealth at present, more children and more educated children. However, there are no statistically significant differences in the current health status of the two groups of women. The differences in long-term outcomes do not appear to be confounded by the endogeneity of marriage, education, employment and occupational choices

Use It or Lose It : Irish Evidence

A small but growing body of research suggests that retirement and cognitive decline are related. In fact, some have argued that retirement causes cognitive decline. The aim of this paper is to add to this literature using data of older women from The Irish Longitudinal Study on Ageing (TILDA). Ordinary least square (OLS) regressions show a significant negative association between retirement and cognitive functioning. These estimates are based on the assumption that retirement is exogenous. As retirement is potentially endogenous with respect to cognition, instrumental variable (IV) methods are also used. The instrument employed is the abolition of the so - called “Marriage Bar”. In simple terms, the Marriage Bar was the requirement that women leave paid employment on getting married. It was established in the 1930s and removed in the 1970s . When IV estimations are used, the effect of retirement on cognition is negative but statistically insignificant. Differences between OLS and IV estimates are compared with a standard test. OLS estimates are preferred as the null hypothesis of exogeneity of retirement cannot be rejected at conventional statistical levels

The long-term consequences of the Irish marriage bar

A Marriage Bar is the requirement that women in certain jobs must leave that job when they marry. Ireland had a Marriage Bar in place until the 1970s. In 2014/2015, women participating in the The Irish Longitudinal Study on Ageing were asked – for the first time in a nationally representative survey – specific questions about their experience of the Marriage Bar. In this paper, we use the information from the TILDA respondents for two purposes. The first is to investigate the extent of the Marriage Bar in Ireland. Our analysis suggests that the Marriage Bar was widespread and not confined to specific sectors or occupations (such as the civil service). The second purpose is to investigate the long-term consequences of the Marriage Bar. We do so by comparing the outcomes of women who were affected by the Marriage Bar with the outcomes of women who were not affected by the Marriage Bar. Regression analysis shows that women affected by the Marriage Bar have shorter working lives, lower individual income but higher household wealth at present, more children and more educated children. However, there are no statistically significant differences in the current health status of the two groups of women. The differences in long-term outcomes do not appear to be confounded by the endogeneity of marriage, education, employment and occupational choices

A distributed approach for parameter estimation in Systems Biology models

Due to the lack of experimental measurements, biological variability and experimental errors, the value of many parameters of the systems biology Mathematical models is yet unknown or uncertain. A possible computational solution is the parameter estimation, that is the identification of the parameter values that determine the best model fitting respect to experimental data. We have developed an environment to distribute each run of the parameter estimation algorithm on a different computational resource. The key feature of the implementation is a relational database that allows the user to swap the candidate solutions among the working nodes during the computations. The comparison of the distributed implementation with the parallel one showed that the presented approach enables a faster and better parameter estimation of systems biology models

Sinterizzati: considerazioni sulle prove di durezza

Prendendo spunto dalla pubblicazione della nuova edizione della norma ISO 4498,sono qui riassunte le indicazioni essenziali per una corretta esecuzione delle prove di macroe microdurezza sui componenti sinterizzati metallici e sui metalli duri, ed è ampiamente commentatala loro interpretazione, tenuto conto che la struttura di questi materiali presenta aspetti talmentepeculiari da aver richiesto la stesura di norme apposite, che sono pertanto richiamate nella bibliografiainsieme con quelle di carattere generale.In particolare lo scopo è quello di fornire elementi per una corretta impostazione dell’assicurazionequalità in campo industriale: in questo modo si può instaurare tra fornitore ed utilizzatore un rapportoi cui termini siano reciprocamente accettabili, senza equivoci

Mother's own milk and bronchopulmonary dysplasia : a systematic review and meta-analysis

Background: Bronchopulmonary dysplasia (BPD) is the most common complication of very preterm birth and can lead to lifelong health consequences. Optimal nutrition is a cornerstone in the prevention and treatment of BPD. In very preterm infants, mother's own milk (MOM) feeding is associated with lower risks of necrotizing enterocolitis, retinopathy of prematurity, and sepsis. Although several studies have shown that MOM may protect against BPD, a systematic analysis of the evidence has not been performed to date. Methods: A comprehensive literature search was conducted using PubMed/MEDLINE and EMBASE, from their inception to 1 December 2017. Longitudinal studies comparing the incidence of BPD in preterm infants fed with exclusive MOM, MOM supplemented with preterm formula (PF), and/or exclusively fed with PF were selected. A random-effects model was used to calculate the Mantel Haenszel risk ratio (RR) and 95% confidence interval (CI). Results: Fifteen studies met the inclusion criteria (4,984 infants, 1,416 BPD cases). Use of exclusive MOM feedings was associated with a significant reduction in the risk of BPD (RR 0.74, 95% CI 0.57-0.96, 5 studies). In contrast, meta-analysis could not demonstrate a significant effect on BPD risk when infants fed with more than 50% MOM were compared with infants fed with <50% MOM (RR 0.98, 95% CI 0.77-1.23, 10 studies) or when infants fed with MOM supplemented with PF were compared with infants fed with exclusive PF (RR 1.00, 95% CI 0.78-1.27, 6 studies). Meta-regression showed that differences in gestational age were a significant confounder of the effect of MOM. Conclusion: To our knowledge, this is the first systematic review and meta-analysis that specifically evaluates the role of MOM on BPD. Our data indicate that MOM may reduce the incidence of BPD when used as an exclusive diet, but this result needs to be interpreted with caution. We did not find the same difference in analyses with other dosages of MOM. Further studies adequately powered to detect changes in BPD rates and that adjust for confounders are needed to confirm the beneficial effects of MOM on BPD

Adiabatic Quantum Computing with Phase Modulated Laser Pulses

Implementation of quantum logical gates for multilevel system is demonstrated through decoherence control under the quantum adiabatic method using simple phase modulated laser pulses. We make use of selective population inversion and Hamiltonian evolution with time to achieve such goals robustly instead of the standard unitary transformation language.Comment: 19 pages, 6 figures, submitted to JOP