Adolescents' Declining Motivation to Learn Science: Inevitable or Not?

There is a growing awareness that science education should center not just on knowledge acquisition but developing the foundation for lifelong learning. However, for intentional learning of science to occur in school, out of school, and after school, there needs to be a motivation to learn science. Prior research had shown that students' motivation to learn science tends to decrease during adolescence [Anderman and Young [1994] Journal of Research in Science Teaching 31: 811–831; Lee and Anderson [1993] American Educational Research Journal 30: 585–610; Simpson and Oliver [1990] Science Education 74: 1–18]. This study compared 5th through 8th grade students' self‐reported goal orientations, engagement in science class, continuing motivation for science learning, and perceptions of their schools' and parents' goals emphases, in Israeli traditional and democratic schools. The results show that the aforementioned decline in adolescents' motivation for science learning in school and out of school is not an inevitable developmental trend, since it is apparent only in traditional schools but not in democratic ones. The results suggest that the non‐declining motivation of adolescents in democratic schools is not a result of home influence but rather is related to the school culture. © 2010 Wiley Periodicals, Inc., J Res Sci Teach 48: 199–216, 2011     

After the fall: Political whitewashing, professional posturing, and personal refashioning in the postwar career of Otmar Freiherr von Verschuer

Despite the numerous books and articles preoccupied with the formidable legitimizing role and unethical medical transgressions of the German human geneticist Otmar von Verschuer (1896-1969) during the Third Reich, scholars have neglected to focus on his career trajectory during the postwar period, especially in the years after he received the first chair of genetics on German soil in 1951. While an examination of von Verschuer's trials, tribulations, and ultimate triumph in post-1945 West Germany is fascinating in its own right, it also raises broader historical issues. First, it lays bare the professional posturing of German biomedical scientists as they attempted to retake control over their once tainted fields of research when Cold War realities opened a window of opportunity for them. Second, it reveals the fine line between adherence to professional ethics and disciplinary solidarity when scientists were faced with a potential outside threat to their profession. Finally, such an analysis demonstrates the macromechanics of professional refashioning on the part of the publicly tainted scientists as they forged a new symbiosis between their field and the politics of a new era in the interest of pursuing research.     

A new family of high viscosity polymeric dispersions for cleaning easel paintings

The procedures for making and applying a new family of high viscosity aqueous polymeric dispersions based on poly(vinyl alcohol)-borax (PVA-borax) matrices are presented. A specific system of this type has been used to remove an oxidized varnish coating from the surface of “Coronation of the Virgin with Saints”, a 15th century egg tempera painting on wood by Neri di Bicci (Florence, 1418–1492). FTIR spectra showed that the oxidized varnish was constituted of highly aged shellac resin. Good cleaning performance was attained when the liquid portion of the dispersion consisted of a mixture of water and acetone. Rheological investigations indicate that the acetone content does not affect the mechanical properties of the polymeric dispersion. Those mechanical properties permit easy removal of the cleaning agent simply by peeling it from the surface by means of a forceps or spatula once it has carried out its cleaning function. Optical microscopic and FTIR investigations show that the cleaning agent is able to remove the oxidized varnish coating from the surface of the Neri di Bicci painting without leaving detectable residues.     

Sport commitment among competitive female gymnasts: a developmental perspective

The purpose of this study was to examine age and competitive level differences in the relationship between determinants and level of sport commitment. Gymnasts (N = 304) comprised three age groups (8-11, 11-14.5, and 14.5-18 years) and two competitive levels (Levels 5-6 and 8-10). Multiple regression analyses revealed: (a) perceived costs and social constraints from parents and best friends were the strongest predictors of commitment for the youngest gymnasts, (b) perceived costs, personal investments, and parent social constraints predicted commitment for 11-14.5-year-old gymnasts, and (c) perceived competence and costs predicted commitment for the oldest gymnasts. Competitive level differences also emerged; for Level 5-6 gymnasts, personal investments, perceived costs, coach social support, and social constraints by coach, best friend, and teammates were predictors of commitment. Personal investments and teammate social constraints were significant predictors for Level 8-10 gymnasts. Developmental factors and additional determinants are important to consider in further studies of the sport commitment model.     

A new class of gels for the conservation of painted surfaces

The application of a new class of organogels as cleaning tools for painted surfaces is described. It combines some of the most attractive features of cleaning liquids and normal gels while diminishing the deleterious characteristics of both. Thus, the ‘latent’ gellant, polyethyleneimine (PEI), reacts with CO₂ at room temperature in solutions of several organic liquids to produce an ammonium carbamate form (PEICO₂). This charged species organizes itself into 3D polymer networks which immobilize the liquids as gels. The properties of the original solution (i.e. a free-flowing liquid) are re-established immediately after addition of a small amount of a weak acid which displaces the CO₂ molecules and makes the PEI chains positively charged. The visual changes are substantiated by rheological analyses. Results from analytical tests to determine the utility of these gels as cleaning tools for painted surfaces of historical and artistic interest, have been obtained from contact angle and FTIR measurements as well as visual comparisons of the surfaces before and after application of the gels. The analyses indicate that the PEICO₂-based organogels were very effective in removing different surface patinas from painted supports. A surface layer of dammar was completely removed from a test canvas with oil paint, an aged painting from the XIX century, and a XV century oil-on-wood panel attributed to Mariotto di Cristoforo. Finally, a surface acrylic polymeric resin (used in a restoration performed during the 1960s) was also successfully removed from Renaissance wall paintings decorating the Santa Maria della Scala Sacristy in Siena, Italy. The isothermally rheoreversible gel approach described in this work represents a new, highly versatile, and very efficient method for removing aged surface patinas from works of art.     

博士生教育国际化的新形式:欧洲博士学位

研究了欧洲博士学位的发展历程及模式,分析了建立欧洲博士学位的必要条件,讨论了阻碍欧洲博士学位发展的因素并提出了相关建议.文章指出,尽管自欧盟成立之初就提出了欧洲博士学位的概念,但直到最近才开始着手解决这一问题.这是包括欧盟委员会、欧洲大学协会、欧洲能授予博士学位的高等教育机构代表和博洛尼亚进程等多方努力的结果.虽然欧洲联合博士学位的工作已取得重要进展,但其合法价值获得真正认可还需要很长的路.由于部分欧盟成员国各国的法律规定以及欧洲高等教育体系内仍然广泛存在着"鼓励学术保护而非促进合作"的保守思想,导致产生了一些问题.阻碍新的联合博士学位发展的两个主要原因是:错误地将国际流动作为目标,而不是将其作为博士生教育的一个策略;广泛担忧一体化将破坏欧洲博士课程的多样化,导致出现同质化.     

Effect of an Animated Classroom Story Embedded in Online Discussion on Helping Mathematics Teachers Learn to Notice

Rich-media representations of teaching using animated cartoons can be effective at stimulating teachers' discussion about practice and hence help them learn productively from one another about their profession. Our research aims to design web-based interactive rich-media virtual settings for teachers to learn to do the practice of teaching. For that purpose, we seek a set of operational design principles that could be used to optimally exploit web-based interactive rich-media technologies. By operational design principles, we mean guidelines that facilitate decision making in the creation of learning conditions. In this article, we report on a study of the effect of embedded animated clips of instructional practice in online interactive forum/chat to support teachers in learning to notice and interpret critical events of classroom interactions. The study showed that both novice and experienced teachers actively participated in discussion and effectively noticed important events of teaching practice. The main findings include the following: (a) Embedding animated representations of teaching in forum/chat, by serving as a common point of reference, helps both novice and experienced teachers effectively notice and discuss noteworthy events in teaching practice; (b) forum suits novice teachers better than chat; and (c) both forum and chat suit experienced teachers in different ways. This study is a critical step in a design-based research agenda toward the building of more complex virtual settings for teacher education.