Social-motivational processes and interpersonal relationships: Implications for understanding motivation at school.

Social-motivational processes and socialization experiences can play a critical role in students' academic success. However, the search for specific mechanisms and processes that explain these social influences on motivation is still in its inception. The purpose of this article was to begin to articulate some of these processes in the hope that more precise explanations of influence will emerge. The 1st section of the article focuses on ways in which social-motivational processes are relevant for understanding motivation to achieve academically, using goal pursuit as a case in point. Models describing complementary, developmental, and hierarchical relations among social and task-related goals and their implications for understanding student achievement are presented. Then, ways in which students' social encounters and experiences with parents, teachers, and peers might influence their adoption and internalization of socially valued goals are examined. New directions for theoretical and empirical inquiry are presented. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The development impact of solar cookers: A review of solar cooking impact research in South Africa

Solar cooking is often considered “a solution looking for a problem”. Solar cookers have long been presented as an interesting solution to the world's problem of dwindling fuel wood sources and other environmental problems associated with wood fuel demand for cooking. However, recent GTZ field work in South Africa showed different benefits instead: the use of solar cookers resulted in appreciable fuel and time savings as well as increased energy security for households using commercial fuels. These observations are based on field tests in South Africa that started in 1996 to investigate the social acceptability of solar cookers and to facilitate local production and commercialisation of the technology. Impact studies and use rate studies have been carried out by a number of different organisations since the inception of the project and although commercialisation of the technology has not been achieved to its fullest potential, impact studies indicate that solar cookers have a positive development impact on households through fuel-, energy- and time savings. The article aims to summarise the findings of the various studies and present an overview of use rates and impact data. A variety of factors influence solar cooker use rates, which in turn determine impacts. Some factors are related to the user, some to the environment in which the cooker is used and some to the cooker itself. Ultimately, the data shows that on average, only 17% of solar cooker owners do not use their stoves after purchase and that active solar cooker users utilise their stoves on average for 31% of their cooking incidences. Since the majority of solar stove buyers actually use their stoves and obtain real benefits, this suggests that that solar cookers are indeed not a solution looking for a problem but a solution worth promoting.     

Does being good make the grade? Social behavior and academic competence in middle school.

Examined relations of prosocial and antisocial classroom behavior to academic achievement, taking into account the possible mediating effects of academically oriented classroom behavior and teachers' preferences for students. Correlational findings based on 423 students in 6th and 7th grade indicated that prosocial and antisocial behavior are related significantly to GPA and standardized test scores and to teachers' preferences for students and academic behavior. Results from multiple-regression analyses suggested that both types of social behavior are significant, independent predictors of classroom grades, even when academically oriented behavior and teachers' preference for students, IQ, family structure, sex, ethnicity, and days absent from school are taken into account. Results of regressions suggested that significant correlations between social behavior and academic outcomes can be explained in part by significant relations between social and academic behavior. The role of social behavior in promoting classroom learning is discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Antioxidant activity of South African red and white cultivar wines and selected phenolic compounds: In vitro inhibition of microsomal lipid peroxidation

In vitro inhibition of microsomal lipid peroxidation (MLP) by the major South African red (Cabernet Sauvignon, Ruby Cabernet, Pinotage, Shiraz, Merlot) and white (Sauvignon blanc, Chenin blanc, Chardonnay, Colombard) commercial cultivar wines is presented for the first time. Of the red wines, Merlot was the most effective MLP inhibitor, with Ruby Cabernet and Pinotage being the least effective. Of the white wines, Chenin blanc and Chardonnay were the least and most effective MLP inhibitor, respectively. The mean antioxidant potencies (AP) of the red and white wine total phenols were 14.25 and 4.19, respectively. Ascorbic acid, present in some white wines, counteracted their ability to inhibit MLP. Inhibition of MLP significantly (P<0.001) correlated with the total phenol content of red (r=0.90) and white (r=0.73) wines, as well as the flavanol content (r=0.88) of red wines and the flavanol (r=0.79) and tartaric acid ester (r=0.73) contents of white wines. The MLP inhibitory activities of selected flavonoids were in the order: Quercetin > procyanidin B3 > malvidin > cyanidin ≈ (−)-epicatechin > (+)-catechin ≈ delphinidin.     

On-line recording of solar cooker use rate by a novel metering device: Prototype description and experimental verification of output data

A metering device for the determination of solar cooker use rate is presented. The device records food temperature, ambient temperature and irradiance. Automatic data evaluation yields the number of cooking cycles, cooking time, food “thermal mass”, as well as the impact on fuel consumption and GHG emission compared to other cooking techniques. Metering results are compared with actual conditions for box-type and concentrating solar cookers and found to be in agreement.     

Recycling of Water and Valuables in Steel Production

Steel production without water is impossible. Given the increasing water scarcity, SMS group is making great efforts to develop its ecoplants products and processes that are characterized by low energy and water consumption and recycling of valuables. The innovations presented here include process‐integrated solutions like the rotating descaler Piroscale® MAT and the ETL evaporator as well as end‐of‐pipe solutions such as the reclamation of valuables using the Ciroval® process or the recycling of water from cooling circuit blowdown, as implemented in the WEISS project.     

Social relationships and motivation in middle school: The role of parents, teachers, and peers.

Adolescents' supportive relationships with parents, teachers, and peers were examined in relation to motivation at school (school- and class-related interest, academic goal orientations, and social goal pursuit). On the basis of 167 sixth-grade students, relations of perceived support from parents, teachers, and peers to student motivation differed depending on the source of support and motivational outcome: Peer support was a positive predictor of prosocial goal pursuit, teacher support was a positive predictor of both types of interest and of social responsibility goal pursuit, and parent support was a positive predictor of school-related interest and goal orientations. Perceived support from parents and peers also was related to interest in school indirectly by way of negative relations with emotional distress. Pursuit of social responsibility goals and school- and class-related interest in 6th grade partly explained positive relations between social support in 6th grade and classroom grades 1 year later. Continued research on the social origins of classroom motivation in early adolescence is needed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Friendships in Middle School: Influences on Motivation and School Adjustment.

In this 2-year longitudinal study (n=242), the authors examined relations of having a reciprocated friend and characteristics of a reciprocated friend to students' social and academic adjustment to middle school. With respect to having a friend, 6th-grade students without friends showed lower levels of prosocial behavior, academic achievement, and emotional distress than did students with reciprocated friendships. Not having a friend in 6th grade also was related to emotional distress 2 years later. Evidence that motivational processes mediate relations between friends' and individuals' prosocial behavior was obtained. For students with reciprocated friendships (n=173). friends' prosocial behavior predicted change in individuals' prosocial behavior in 8th grade by way of changes in goals to behave prosocially. Implications for studying friendship influence in middle school are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Agglomeration and electrical percolation behavior of carbon black dispersed in epoxy resin

In conductive polymer compounds, the filler volume fraction at which a network of touching particles is formed is not a constant but depends on the manufacturing process. By applying three main features—particle-particle interaction, dynamics of agglomeration, and structure of agglomerates—which are well known in colloid science to filled polymers, the electrical percolation behavior can be understood. Thus, it is possible to explain the hitherto found low percolation thresholds of less than 0.5 vol% in carbon-black-filled resins and, hence, further reduce the threshold to 0.06 vol%. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1741–1746, 1997     

Relations among family interaction patterns, classroom self-restraint, and academic achievement in preadolescent boys.

Relations among observed family interaction patterns, preadolescent boys' classroom self-restraint, and academic achievement were studied in a sample of 65 intact families. In contrast to previous work in this area, children's social adjustment was introduced as a potential mechanism that mediates the relations between parent–child interactions and academic performance. Correlational results showed significant relations between achievement and all parent–child interaction scores except mother–son hostility. However, regression analyses suggested that the association between father–son interactions and achievement is mediated almost entirely by sons' restraint, whereas the relationships between mother–son interactions and achievement are not. Observed mother–father hostility also appears to be an indirect predictor of sons' academic achievement by way of its association with sons' restraint. These findings are especially important in that they identify social competence in the form of behavioral self-restraint as a noncognitive mediator between the quality of family functioning and academic achievement during early adolescence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)