Control centers design for ergonomics and safety

This paper shows the general design conditions about ergonomics and safety for control centers in the petrochemical process industry. Some of the topics include guidelines for the optimized workstation design, control room layout, building layout, and lighting, acoustical and environmental design. Also takes into account the safety parameters in the control rooms and centers design. The conditions and parameters shown in this paper come from the standards and global advances on this topic on the most recent publications. And also the work was supplemented by field visits of our team to the control center operations in a petrochemical company, and technical literature search efforts. This guideline will be useful to increase the productivity and improve the working conditions at the control rooms.     

Integer-valued autoregressive processes with periodic structure

In this paper the periodic integer-valued autoregressive model of order one with period T, driven by a periodic sequence of independent Poisson-distributed random variables, is studied in some detail. Basic probabilistic and statistical properties of this model are discussed. Moreover, parameter estimation is also addressed. Specifically, the methods of estimation under analysis are the method of moments, least squares-type and likelihood-based ones. Their performance is compared through a simulation study.     

Support and Access in Sports and Leisure Provision

This paper will look at different ways of enabling people with learning difficulties to engage in leisure opportunities: the Support Model and the Access Model. These models will be put in their social context and then critiqued.

The support model will be be contextualised in the theory of normalisation, access in disability theory. The support worker role will be shown to be useful in motivating people with learning difficlties into new activities, as well as having a protecting element, and unwittingly, disguise the level of discrimination people with learning difficulties are subject to.

The access worker role will be shown to have strengths in understanding discrimi nation. With this analysis, it has the potential to dismantle disabling practices. However, the needs of people with learning difficulties have ramifications for disability theory. In practice, that means that ideas of self-advocacy need to be taken on board.

Through interviews with sports personnel, social workers and people with learning difficulties, the implications of creating fully comprehensive access will be examined. I will conclude that both effective support and comprehensive access must be in place before people with learning difficulties are able to make a meaningful choice as to how they are enabled to participate in sports. It is only at that point of choice that the two models become complementary rather than competing discourses of provision.     

Revisiting the Structure of Subjective Well-Being in Middle-Aged Adults

Subjective well-being is a broad, multifaceted construct comprising general satisfaction with life, satisfaction with life domains (health, family, people, free time, self, housing, work, and finances), positive affect, and negative affect. Drawing on representative data from middle-aged adults (N = 738), the authors used three different structural models to analyze the interrelationships among these facets of subjective well-being. In a top-down model, a single factor representing global subjective well-being explained the correlations found among the more specific facets of subjective well-being and exerted the strongest influence on general satisfaction with life, satisfaction with health, and satisfaction with finances. In a bottom-up model, satisfaction with the latter two domains had the strongest effect on global subjective well-being. The authors discuss the implications of their findings for research on subjective well-being.     

The effect of violent crime on teenage pregnancy in Mexico

Review of Economics of the Household - This paper explores the effect of violent crime on teenage pregnancy in Mexico using data from a nationally representative longitudinal survey conducted...     

Estimating the Spot Covariation of Asset Prices—Statistical Theory and Empirical Evidence

ABSTRACT

We propose a new estimator for the spot covariance matrix of a multi-dimensional continuous semimartingale log asset price process, which is subject to noise and nonsynchronous observations. The estimator is constructed based on a local average of block-wise parametric spectral covariance estimates. The latter originate from a local method of moments (LMM), which recently has been introduced by Bibinger et al.. We prove consistency and a point-wise stable central limit theorem for the proposed spot covariance estimator in a very general setup with stochastic volatility, leverage effects, and general noise distributions. Moreover, we extend the LMM estimator to be robust against autocorrelated noise and propose a method to adaptively infer the autocorrelations from the data. Based on simulations we provide empirical guidance on the effective implementation of the estimator and apply it to high-frequency data of a cross-section of Nasdaq blue chip stocks. Employing the estimator to estimate spot covariances, correlations, and volatilities in normal but also unusual periods yields novel insights into intraday covariance and correlation dynamics. We show that intraday (co-)variations (i) follow underlying periodicity patterns, (ii) reveal substantial intraday variability associated with (co-)variation risk, and (iii) can increase strongly and nearly instantaneously if new information arrives. Supplementary materials for this article are available online.     

Family Integration,Achievement Values,Academic Self-Concept and Dropping Out of High School

Recognizing the linkages among family, neighborhood, and work, this study examines whether neighborhood resources (neighborhood satisfaction and informal helping) mediate the relationships between job stressors (work hours, job inflexibility, and work-to-family conflict), family stressors (housework hours and family-to-work conflict), and father-child relationship quality. We performed OLS regressions on data from fathers (N?=?85) from a random sample of couples from the northern part of a western state. Results indicate a direct and negative relationship between job inflexibility and father-child relationship quality that is partially mediated by neighborhood satisfaction. Additionally, family-to-work conflict bears a direct and negative relationship with father-child relationship quality, and neighborhood satisfaction mediates this relationship. Altogether, the analyses support the contention that neighborhood resources may mitigate some of the stresses associated with work and family life.     

Circular balanced repeated measurements designs

The concept of a circular design is defined and when proper balance for various effects is assumed, its universal optimality is proved over the class of all designs with the same set of parameters, Such designs are shown to minimize the variance of the best linear unbiased estimators of contrasts of residual and direct effects over the class of equireplicated designs. All models assume first order residual effects and are of a circular nature. The proofs are presented in a unified manner for several models at a time. They are based on certain matrix domination which occurs when parameters are eliminated from a linear modelj this latter fact is proved for a general linear model.