Mathematics education as a ‘design science’

Mathematics education (didactics of mathematics) cannot grow without close relationships to mathematics, psychology, pedagogy and other areas. However, there is the risk that by adopting standards, methods and research contexts from other well-established disciplines, the applied nature of mathematics education may be undermined. In order to preserve the specific status and the relative autonomy of mathematics education, the suggestion to conceive of mathematics education as a design science is made.Revised and extended version of the paper Mathematikdidaktik als design science, published inJournal für Mathematikdidaktik 13 (1992), 55–70. I am indebted to Jerry P. Becker, P. Bender, H. Besuden, W. Blum, E. Cohors-Fresenborg, Th.J. Cooney, L. Führer, H.N. Jahnke, A. Kirsch, G.N. Müller, H._Chr. Reichel, H. Schupp, Ch. Selter, H.-J. Vollrath, J. Voigt, G. Walther and H. Winter for critical remarks to earlier drafts.     

绿茶化学成分的研究

报道了绿茶化学成分的提取、分离、结构鉴定的方法.确定了绿茶主要化学组成为咖啡因和茶多酚,为开发利用绿茶提供了科学依据.     

Vulcanization of rubber

The chemical modifications that occur during vulcanization of rubber and methods for controlling the process are discussed.     

Classification and Subject Indexing Issues at a Mexican Library Specializing in Law Research

Abstract

Subject indexing and classification of law resources is a complex issue due to several factors: specialized meanings of legal terms, meanings across different branches of law, terms in legal systems from diverse countries, and terms in different languages. These issues led to the development of a classification and subject indexing system which will help answer the major challenges of indexing and classifying law resources in the Research Institute Library at the National Autonomous University of Mexico. Adopting its own classification required interdisciplinary work between law and information organization specialists, constant updating by legal specialists and others beyond the Legal Research Institute; and the sharing of this classification system with other institutions. Now, this classification system is used by important institutions that specialize in law, such as the network of Libraries of the Supreme Court of Justice of the Nation of Mexico. The purpose of this article is to show why and how this law classification and subject system was developed and is continuously being updated by libarians and law scholars in order for it to meet their specific needs.     

ACT UP,Haitian Migrants,and Alternative Memories of HIV/AIDS

In 1786, backcountry Massachusetts farmers, fed up with government policies favoring aristocratic elites, marched on courts to bar the entry of judges and juries. Enacting a long-standing tradition known to colonists as a “Regulation,” the farmers’ movement became known as Shays's Rebellion. Erupting in the turbulent days following the War for Independence, yet predating the formation of the national Constitution, Shays's Rebellion was understood as a crucial post-war attempt to deploy state violence to manage popular dissent; thus, Shays's Rebellion produced deeply problematic yet lasting rhetorical conventions for justifying the compromised forms of republicanism that mark the early republic.     

Acts of Activism: Human Rights as Radical Performance

EIGHTEENTH‐CENTURY BRITISH LOGIC AND RHETORIC. By Wilbur Samuel How‐ell. Princeton, New Jersey: Princeton University Press, 1971; pp. xii+742. $20.00.     

Responding to external accountability in high-performing,high-capacity public secondary schools in Chile

The qualitative study on which this article reports explored how senior leaders, mathematics and Spanish language teachers (N = 72) in four high-performing, high-poverty, public secondary schools in Chile enact performance-based accountability policies related to standardised assessments. These four public schools were selected because prior to when the study was conducted all were part of the Bicentennial Schools Programme led by the Ministry of Education from 2010 to 2014. The aim of the programme was to develop effective secondary schools to serve low-income students. A thematic analysis of data produced through individual and group interviews and observations of departmental meetings shows that the enactment of performance-based accountability involved two dimensions of learning-centred leadership, distributed among senior leaders and department heads. An aim shared by parents, students, teachers and senior leaders was to ensure students' access to, and completion of, studies in higher education. Attaining good scores in national standardised SIMCE tests was key to meeting the vision. Collective trust among all actors and macro level trust in standardised testing served as a resource for strong collaboration to improve instruction and learning as well as teachers' collective efficacy. The discussion focuses on school-level practices and policy-level decisions that create conditions for the effective use of information produced from standardised assessments. A key point supported by our findings is that successful performance in external assessments is resourced by, and fosters, trust formation in schools.