Energy-based control of a distributed solar collector field

Model-based control of the outlet temperature of a distributed solar collector field is studied. An energy-based controller is derived using internal energy as a controlled variable. The controller relies on a distributed parameter nonlinear plant model and includes feedforward from the solar irradiation and inlet temperature. Convergence of the closed loop is proved, and the method is experimentally verified to perform well on a pilot-scale solar power plant.     

Spatial ability for STEM domains: Aligning over 50 years of cumulative psychological knowledge solidifies its importance.

The importance of spatial ability in educational pursuits and the world of work was examined, with particular attention devoted to STEM (science, technology, engineering, and mathematics) domains. Participants were drawn from a stratified random sample of U.S. high schools (Grades 9–12, N = 400,000) and were tracked for 11+ years; their longitudinal findings were aligned with pre-1957 findings and with contemporary data from the Graduate Record Examination and the Study of Mathematically Precocious Youth. For decades, spatial ability assessed during adolescence has surfaced as a salient psychological attribute among those adolescents who subsequently go on to achieve advanced educational credentials and occupations in STEM. Results solidify the generalization that spatial ability plays a critical role in developing expertise in STEM and suggest, among other things, that including spatial ability in modern talent searches would identify many adolescents with potential for STEM who are currently being missed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Assessing vocational preferences among gifted adolescents adds incremental validity to abilities: A discriminant analysis of educational outcomes over a 10-year interval.

The researchers used the theory of work adjustment (R. V. Dawis & L. H. Lofquist, 1984; L. H. Lofquist & R. V. Dawis, 1991) and C. P. Snow's (1959) conceptualization of two cultures as theoretical frameworks to analyze the incremental validity of above-level preference assessment (relative to abilities) in predicting humanities, math-science, and other college majors completed 10 years later by intellectually gifted adolescents. Scholastic Aptitude Tests and Study of Values assessments of 432 intellectually gifted adolescents (age 13) provided unique and valuable information for predicting the type of college major completed 10 years after initial assessment. These positive findings add to growing support for the applied utility of teaming preference assessments among the gifted with above-level assessments of ability. For intellectually gifted adolescents, these assessments could facilitate educational planning (and counseling). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Approaches to the design of sustainable housing with low CO2 emission in Denmark

Over the last year there has been a remarkable change in politicians' attitudes within Denmark and EU member states to the issue of climate change. This change in the political mindset is a result of the increasing frequency of high winds and flooding in Denmark and Europe, as well as in many other places around the world in recent years. This has resulted in an increasing challenge in terms of the planning, design and building of more sustainable buildings in order to reduce the use of energy for heating and cooling in new housing projects by bringing down the emission of CO₂ by reducing the amount of fossil fuel consumed by the built environment. This is crucial since carbon dioxide is one of the so-called greenhouse gases that is playing a major role in global warming. There is thus an increased focus on reducing the CO₂ level on a national and global scale. This article will look at the architectural and legislative changes in Denmark in relation to the increased political interest in the consequences of climate change. The article also discusses a survey of different types of approaches to the sustainable design of buildings and shows examples of new Danish housing projects that can minimise the use of energy for heating and cooling in the shape of detached houses, as well as a master thesis on high-rise houses.     

Work preferences, life values, and personal views of top math/science graduate students and the profoundly gifted: Developmental changes and gender differences during emerging adulthood and parenthood.

Work preferences, life values, and personal views of top math/science graduate students (275 men, 255 women) were assessed at ages 25 and 35 years. In Study 1, analyses of work preferences revealed developmental changes and gender differences in priorities: Some gender differences increased over time and increased more among parents than among childless participants, seemingly because the mothers’ priorities changed. In Study 2, gender differences in the graduate students’ life values and personal views at age 35 were compared with those of profoundly gifted participants (top 1 in 10,000, identified by age 13 and tracked for 20 years: 265 men, 84 women). Again, gender differences were larger among parents. Across both cohorts, men appeared to assume a more agentic, career-focused perspective than women did, placing more importance on creating high-impact products, receiving compensation, taking risks, and gaining recognition as the best in their fields. Women appeared to favor a more communal, holistic perspective, emphasizing community, family, friendships, and less time devoted to career. Gender differences in life priorities, which intensify during parenthood, anticipated differential male-female representation in high-level and time-intensive careers, even among talented men and women with similar profiles of abilities, vocational interests, and educational experiences. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Multipotentiality among the intellectually gifted: "It was never there and already it's vanishing."

The theory of work adjustment was used as a conceptual framework in evaluating the concept of multipotentiality, taken from the psychological literature on counseling intellectually gifted individuals (viz., those with high-flat ability and preference profiles that may lead to career indecision and distress). An examination of over 1,000 intellectually gifted students (top 1%) in 4 separate cohorts, assessed with the Scholastic Aptitude Test, the Study of Values, and J. L. Holland's (1985) six interest themes, revealed little empirical support for the prevalence of multipotentiality within intellectually talented adolescents (     

Huge sex ratios at upper end.

Despite J. S. Hyde's (1981) guarded optimism with respect to cognitive differences between males and females, the present authors argue that looking at mean differences between the sexes in mathematical reasoning ability does not illuminate the topic. The importance of research into the causes and remedies of gender differences in mathematical reasoning ability, rather than the present trend of minimizing those differences, is stressed. (4 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)