Flow stress characterization of magnesium alloys at elevated temperatures: A review

The flow behaviors of magnesium alloys are too complicated to be simply formulated in a mathematical form. Most researches have based metallurgically or phenomenologically on specific functions with many constants, which could be applied only to the limited magnesium alloys under specific conditions. In this study, a review on the studies of flow stress characterization of magnesium alloys is conducted and the possibility of using the traditional piecewise C-m model and its extension to characterize the magnesium alloys is emphasized. The formulations of major flow models are given with three typical applications to magnesium alloy AZ80 and its characteristics are demonstrated through comparison of the fitted flow behaviors with their associated experiments and various flow stress models including Arrehenius model, four Ludwik family models (Johnson Cook, Modified Johnson-Cook, Hensel-Spittel, Sutton-Luo), two Voce family models (Ebrahimi et al., Razali et al.) and C-m models.

Ever more parents in polyamorous families: A new materialist typology of parenting practices and division of work

An analysis of parents that are a part of polyamorous networks—networks of three, four, or even more residential or highly available parents—shows three types of parenting practices: poly-nuclear, hierarchical, and egalitarian parenting. Especially, the hierarchical and egalitarian parenting practices show novel divisions of care work and a transgression of gender norms. However, in-depth new materialist analysis of qualitative interviews also shows how parents are, in specific situations, pushed toward standard family models and thus unintentionally maintain traditional family structures and gender roles.

O-108 Opinion and perceptions about how new family models conceived through Assisted Reproduction Techniques and parenthood differ between different generations in Argentina

Study question What is the degree of acceptance of new family models using Assisted Reproductive Techniques and what is the childbearing perception among different generations in Argentina Summary answer The youngest accept different family conformations through fertility treatments more than olders. They also consider, in greater proportion, that happiness is not linked to childbearing What is known already (1). Human reproduction changed dramatically in the last 40 years, with the development of Assisted Reproductive Treatments (ART) (2). In accordance with the new family models, gender diversity, self-acceptance and social openness, unacceptable until recently, are today a new reality. Since 2013, in Argentina, fertility treatments are regulated under National Law No. 26.862, allowing full access to ART regardless of marital status or sexual orientation. (3). However, there is still a legal vacuum around uterine surrogacy, which hinders treatment particularly in male homosexual couples. Study design, size, duration This is a cross-disciplinary descriptive study based on data obtained from an online self-administered survey. We surveyed a sample of 1800 people from the general population during June 2020. Participants/materials, setting, methods A structured and self-administered survey was carried out through OPINAIA (research consultant). Participants answered voluntarily an anonymous online questionnaire. We stratified our population in 4 groups according to different generations that represent the Argentinean population: Centennials (18-25 years), Millennials (26-35 years), Gen X (36-49 years), Baby Boomers (more than 50 years), respectively. We also stratified our sample by gender, socioeconomic level, and geographic location. Main results and the role of chance The data obtained in our survey showed that 92% of our population expressed an agreement to the use of ART for heterosexual couples, 76% for single women, 65% for single men, 62% for female couples and 59% as to male couples. However, when stratifying by generations, we observed that the youngest showed a clear tendency to accept the new family conformation models with respect to the oldest ones. When comparing by generations, Centennials showed a strong agreement for single women (63%), single men (52%), female couples (60%) and male couples (58%). However, Baby Boomers express agreement on single women (33%), single men (24%), female partners (24%), male partners (22%). So, our data reveals that the prejudices concerning the different family conformations models are less among the youngest. We also observe a tendency towards believing that happiness is not related to parenthood by the younger (Centennials 75%, Millennials 67%, X Generation 64%, Baby Boomers 60%). This is a representative sample of the Argentinean populations, based upon official National census. Thus, it accurately represents the local distribution concerning age, gender, socioeconomic level, and geographic location. Limitations, reasons for caution Our investigation is a descriptive and observational study Wider implications of the findings This is the first study about new family models in Latin America. The study sample represents the national population and reflects clearly social trends. Therefore, it allows predicting future scenarios for policy makers to plan effective education strategies and to consider the distribution of public health funds for fertility treatments. Trial registration number not applicable

JMASM 57: Bayesian Survival Analysis of Lomax Family Models with Stan (R)

An attempt is made to fit three distributions, the Lomax, exponential Lomax, and Weibull Lomax to implement Bayesian methods to analyze Myeloma patients using Stan. This model is applied to a real survival censored data so that all the concepts and computations will be around the same data. A code was developed and improved to implement censored mechanism throughout using rstan. Furthermore, parallel simulation tools are also implemented with an extensive use of rstan.

Using Models of the GARCH Family to Estimate the Level of Food and Non-Food Inflation in Ethiopia

An increase in inflation volatility implies higher uncertainty about future prices. As a result, producers and consumers can be affected by the increased inflation volatility, because it increases the uncertainty and the risk in the market. Thus, inflation volatility attracts the attention of researchers to find a suitable model which can predict the future conditions of the market. This study aims to fit appropriate ARMA-GARCH family models for food and non-food inflation rate of from the period January 1971 through June 2020. Since the main objective of the study is identifying an appropriate model for inflation series, the null and alternative hypotheses are defined in comparison of the two types of models. H0: The symmetric GARCH models better capture inflation volatility of Ethiopia. H1: The asymmetric GARCH models better capture inflation volatility of Ethiopia. The ARMA-GARCH family models were applied to capture the stylized facts of financial time series such us leptokurtic, volatility clustering and leverage effects. The mean model results show that, an ARMA (1, 2) and ARIMA (0, 1, 1) models are identified as the best fitted model for food and non-food inflation, respectively. From the estimation results of volatility model, an asymmetric TGARCH (1, 1) model with Student's t- distributional assumptions of the residual is the best model for non-food inflation. Thus, modeling of information, news of events is very significant determinants of volatility and GARCH family models are appropriate for the given series (monthly food-inflation volatility) of Ethiopia under the study period considered.