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The demand to create learning arrangements In which self-controlled learning is possible becomes increasingly urgent. The established German-language literature on projects names characteristics of self-controlled learning as central components of project-based instruction. Learners, on the other hand, consider themselves less selfcontrolled in project-oriented Instruction and their assessment is confirmed by that of the teachers. Thus, a discrepancy Is revealed between the expectations connected with selfcontrolled learning In project-based Instruction and its evaluation by both teachers and learners. Source

Martens A.,University of Education, Karlsruhe
International Journal of Odonatology | Year: 2015

Zygonyx torridus inhabits waterfalls, rapids and riffle sections. Males patrol over these sites. After copulation the partners perform an extensive search while flying in tandem over a wide range. Behavioural studies in Mauritius 1997 and 2014 showed that there is considerable plasticity in oviposition behaviour. Three main modes could be distinguished: (A) egg-laying in tandem during flight; (B) the female placing the eggs while dipping in flight without physical contact with the male; and (C) the female placing the eggs when settled without physical contact with the male. On several occasions two modes, and in a single case all three types, were observed within one oviposition sequence. In odonates, such a high degree of plasticity in reproductive behaviour was not reported previously. © 2015, Worldwide Dragonfly Association. Source

Martens A.,University of Education, Karlsruhe
International Journal of Odonatology | Year: 2010

From 12 to 25 August 2009, the odonate fauna of Santo Antäo, Cape Verde was surveyed by recording adults and collecting larvae and exuviae at 26 localities, mostly situated in the northwest of the island. Based on the results of this survey and literature data on the Cape Verdes it appears that the resident odonate fauna consists of only five species, namely Anax imperator, Crocothemis erythraea, Orthetrum trinacria, Trithemis annulata and Zygonyx torridus. Three additional species, Anax ephippiger and Pantala flavescens, which were recorded as single adults in this study, and Sympetrum fonscolombii, which was previously recorded in another study, represent seasonal invaders that do not establish permanent populations on the island. Surprisingly, there is no zygopteran species recorded from the island, although a few occur on the neighbouring islands. The breeding habitats of the resident odonates on the island comprise short perennial stream sections in large wadi beds ('ribeiras') that are intensely used for agriculture, as well as artificial irrigation tanks. The odonate assemblage is very uniform, although Z. torridus prefers micro-habitats with flowing water and O. trinacria is found only in micro-habitats with fine sediments. In the absence of fish, crabs and large water beetles, the larva of A. imperator appears to be the top predator in freshwater habitats. Source

Libbrecht P.,University of Education, Karlsruhe
CEUR Workshop Proceedings | Year: 2012

Searching for mathematical concepts being indicated in a document is not easy with the existing technologies because the current information retrieval technology has been designed for words and mathematical concepts are often made of more than single words. Skills text box is an approach to this retrieval problem: it lets users use the classical search by words paradigm to search for the concept then identify it by choosing through a finite list. Skills text box is the device used to support the search engine of i2geo.net: At contribution and search time. In this paper for MathUI 2012, we sketch the current technical development Skills-text-box, and present its advantages and limits as have been experimented by multiple mathematics teachers in Europe. Source

Peterhans E.,University of Konstanz | Worth A.,University of Education, Karlsruhe | Woll A.,Karlsruhe Institute of Technology
Journal of Adolescent Health | Year: 2013

Purpose: The aim of this study was to analyze the association between adolescent and familial health behavioral factors and cardiorespiratory fitness in German adolescent boys and girls. Methods: This study is based on a large nationwide cross-sectional study and its substudy on physical activity and fitness of children and adolescents ("Motorik-Modul"). For 1,328 adolescents between 11 and 17 years of age, data on cardiorespiratory fitness (Physical working capacity 170, PWC170) and familial and adolescent health behavioral factors were collected. Health behavior was assessed using psychometric questionnaires (socioeconomic status, pubertal stage, daily physical activity, sports-club time, parental physical activity habits, etc.). A hierarchical multiple regression model was used to quantify the association between relative PWC170 values and health behavior. Results: The relationship between adolescents' health behavioral factors and cardiorespiratory fitness was stronger than the relationship between age, social status, familial health behavior and cardiorespiratory fitness. Familial health behavioral factors explained 4.1% and 2.1% of variance in cardiorespiratory fitness in girls and boys, respectively. Adolescents' health behavioral factors explained 15.2% of variance in girls and 25.7% of variance in boys. For both girls (β =.273) and boys (β =.400), being normal weight had the greatest effect on relative PWC170 values. Conclusions: The difference in explained variance in cardiorespiratory fitness by familial and adolescents' health behavioral factors between girls and boys indicates that different predictors for cardiorespiratory fitness are important for girls and boys. Hence, sex specific research and interventions aimed at improving familial and adolescent health behavior may be important. © 2013 Society for Adolescent Health and Medicine. All rights reserved. Source

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