A mathematical model for power output in rowing on an ergometer

A mathematical model relating power output of rower to stroke rate on an ergometer (the Concept II Indoor Rower TM, Model C) is studied. The model is used to analyse the ergometer performance of a particular rower. It is determined that he can be more efficient (i.e. decrease power output while maintaining fixed velocity) by decreasing stroke rate, but at the expense of increasing force during the drive. It is also shown that he can be more efficient by increasing the drag factor (using higher vent setting) without increasing force. Dependence of power output on rowing style (the shape of the force curve) is also examined. It is shown that variation of force during the drive has little effect on efficiency, but efficiency is reduced by asymmetry of the force curve that favours the legs.     

关于有氧健身操的调查与研究

通过对有氧健身操、有氧操的锻炼内容、强度及音乐的调查,认为目前参与有氧健身操不乏其人．但大多数人都进行得较盲目。建议规范健身组织以及健全健身指导员组织。     

Entwicklung gro?er Systeme mit generischen Methoden – Eine übersicht über den Sonderforschungsbereich 501

Ohne Zusammenfassung     

Themenheft: Softwaretechnik '98

Ohne Zusammenfassung     

The War and Post-War Impact on the Educational System of Bosnia and Herzegovina

Bosnia and Herzegovina (BiH), much like other eastern-European countries, has faced a brief period of transition from the socialist system to capitalism. However, this was interrupted in BiH by a brutal war lasting four years. Social systems and infrastructure were damaged or destroyed, including education, which was harnessed during the war to divide the country and then perpetuate these divisions. The author deals with some of the strongest and most enduring impacts that the war has had on education, which even now, more than 10 years after the war, pose a serious threat to this young country. The most obvious include the division of youth according to nationality, religion or language, the unequal positions of certain groups in education, and very clear segregation and discrimination. She points out some of the most frequent and overt ways in which intolerance towards other nationalities is displayed through textbooks, especially those used in parts of BiH subject to a struggle for independence during the war.