Piecewise deterministic Markov processes applied to fatigue crack growth modelling

In this paper, we use a particular piecewise deterministic Markov process (PDMP) to model the evolution of a degradation mechanism that may arise in various structural components, namely, the fatigue crack growth. We first derive some probability results on the stochastic dynamics with the help of Markov renewal theory: a closed-form solution for the transition function of the PDMP is given. Then, we investigate some methods to estimate the parameters of the dynamical system, involving Bogolyubov's averaging principle and maximum likelihood estimation for the infinitesimal generator of the underlying jump Markov process. Numerical applications on a real crack data set are given.     

Effects of Welfare Participation on Marriage

We investigate the widely held premise that welfare participation causes women to refrain from marriage. Using data from the Fragile Families and Child Wellbeing study (N = 3,219), we employ an event history approach to study transitions to marriage among mothers who have had a non-marital birth. We find that welfare participation reduces the likelihood of transitioning to marriage (hazard ratio is .67, p < .01), but only while the mother is receiving benefits. Once the mother leaves welfare, past receipt has little effect on marriage. We infer that the negative association between welfare participation and subsequent marriage reflects temporary economic disincentives rather than an erosion of values.     

Solving the minimum M-dominating set problem by a continuous optimization approach based on DC programming and DCA

We propose a new optimization approach based on DC (Difference of Convex functions) programming and DCA (DC Algorithm) to the so-called Minimum M-Dominating Set problem in graphs. This problem is beforehand re-casted as a polyhedral DC program with the help of exact penalty in DC programming. The related DCA is original and computer efficient because it consists of solving a few linear programs and converges after a finite number of iterations to an integer solution while working in a continuous domain. Numerical simulations show the efficiency and robustness of DCA and its superiority with respect to standard methods.     

Free Personal Care in Scotland: A Narrative Review

The advent of free personal care for older people was a definingmoment in the development of UK political devolution. Afterall the controversy surrounding the 1999 Royal Commission onLong Term Care, Scotland’s decision to implement the mainrecommendations of the Sutherland Committee was a decisive breakfrom Whitehall’s approach and seemed to offer a key opportunityto learn from the implications of this policy for an Englishcontext. Against this background, this paper summarizes theorigins, nature and impact of free personal care, providinga narrative review of the policy to date.     

Cyclical Cohabitation Among Unmarried Parents in Fragile Families

Building on past research suggesting that cohabitation is an ambiguous family form, the authors examined an understudied residential pattern among unmarried parents: cyclical cohabitation, in which parents have multiple cohabitation spells with each other. Using 9 years of panel data from the Fragile Families and Child Wellbeing Study (N = 2,084), they found that 10% of all parents with nonmarital births and nearly a quarter of those living together when the child is 9 years old are cyclical cohabitors. Cyclically cohabiting mothers reported more material hardships than mothers in most other relationship patterns but also reported more father involvement with children. On all measures of child well‐being except grade retention, children of cyclically cohabiting parents fared no worse than children of stably cohabiting biological parents and did not differ significantly from any other group.     

Why the Extractive Industry Should Support Mandatory Transparency: A Shared Value Approach

The Transparency Amendment, included in the Dodd‐Frank Wall Street Reform and Consumer Protection Act, can be an important tool in curtailing the resource curse that so heavily burdens resource‐rich developing countries by shedding light on opaque payments between the extractive sector and host countries. From the get‐go, however, extractive industry companies have fiercely opposed the new mandatory disclosure requirements as set out in this regulation. The corporate opposition is for the largest part motivated by the fear of a competitive disadvantage that derives from the fact that the amendment is housed with the Securities and Exchange Commission (SEC) and thus only holds jurisdiction over those that report to the SEC. Although on the one hand watering down these corporate fears, this article draws on the “shared value approach” and empirical evidence to argue that there is a business case for transparency. This refreshing take on transparency regulation invites corporate leaders to reassess their current oppositional stance and to embrace new initiatives like the Transparency Amendment and to take a proactive stance in building a convincing global regulatory system of transparency.     

A multi-city epidemic model

Some analytical results are given for a model that describes the propagation of a disease in a population of individuals who travel between n cities. The model is formulated as a system of 2n 2 ordinary differential equations, with terms accounting for disease transmission, recovery, birth, death, and travel between cities. The mobility component is represented as a directed graph with cities as vertices and arcs determined by outgoing (or return) travel. An explicit formula that can be used to compute the basic reproduction number, {\cal R}_0 , is obtained, and explicit bounds on {\cal R}_0 are determined in the case of homogeneous contacts between individuals within each city. Numerical simulations indicate that {\cal R}_0 is a sharp threshold, with the disease dying out if {\cal R}_0 1 .     

A ‘Minority’ on the Move: Boundary Work among Filipina Muslim Migrant Domestic Workers in the Middle East

This article analyses the migration of a religious ‘minority’ that is largely invisible within migration studies, namely Muslim Filipina domestic workers. More specifically, this research shows that the category of ‘minority’ is not fixed and is always negotiated through transnational spaces and boundary work. In doing so, the article highlights how religious belonging, the status of minority and migration intersect and are negotiated during the period prior to these women leaving their country, during their time in the country of destination, and when they return to the Philippines. How boundary work affects the religious belonging of this Muslim ‘minority’ is underlined by presenting the Middle East as an opportunity to perform norms of ‘Muslimness’. The performance of these norms as an opportunity for these women to challenge the status of being a ‘minority’ in the Philippines is also examined. Finally, this article shows how these Muslim ‘minorities’ gain access to a certain symbolic capital by becoming hajji and balikbayan (returnees) when they return home.     

Be Careful Where You Smile: Culture Shapes Judgments of Intelligence and Honesty of Smiling Individuals

Smiling individuals are usually perceived more favorably than non-smiling ones—they are judged as happier, more attractive, competent, and friendly. These seemingly clear and obvious consequences of smiling are assumed to be culturally universal, however most of the psychological research is carried out in WEIRD societies (Western, Educated, Industrialized, Rich, and Democratic) and the influence of culture on social perception of nonverbal behavior is still understudied. Here we show that a smiling individual may be judged as less intelligent than the same non-smiling individual in cultures low on the GLOBE’s uncertainty avoidance dimension. Furthermore, we show that corruption at the societal level may undermine the prosocial perception of smiling—in societies with high corruption indicators, trust toward smiling individuals is reduced. This research fosters understanding of the cultural framework surrounding nonverbal communication processes and reveals that in some cultures smiling may lead to negative attributions.     

Does Life in the United States Take a Toll on Health? Duration of Residence and Birthweight among Six Decades of Immigrants

We used data from the 1998–2009 waves of the National Health Interview Survey to investigate cohort differences in low birthweight among US‐born children of mothers arriving in the United States between 1955 and 2009, cohort‐adjusted patterns in low birthweight by maternal duration of residence in the United States, and cohort‐adjusted patterns in low birthweight by maternal duration of US residence stratified by age at arrival and region of origin. We found a consistent deterioration in infant health with successive immigrant cohorts and heterogeneous effects of cohort‐adjusted duration in the United States by age at arrival and region. Most notably, we found evidence that maternal health (as proxied by low birthweight) deteriorates with duration in the United States only for immigrant mothers who came to the United States as children. For mothers who arrived as adults, we found no evidence of deterioration. The findings underscore the importance of considering age at arrival and place of origin when studying post‐migration health trajectories and provide indirect evidence that early life exposures are a key to understanding why the United States lags other developed nations in health.