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This study examines the difficulties college students experience when creating and interpreting graphs in which speed is one of the variables. Nineteen students, all preservice elementary or middle school teachers, completed an upper‐level course exploring algebraic concepts. Although all of these preservice teachers had previously completed several mathematics courses, including calculus, they demonstrated widespread misconceptions about the variable speed. This study identifies four cognitive obstacles held by the students, provides excerpts of their graphical constructions and verbal interpretations, and discusses potential causes for the confusion. In particular, misconceptions arose when students interpreted the behavior and nature of speed within a graphical context, as well as in situations where they were required to construct a graph involving speed as a variable. The study concludes by offering implications for the teaching and learning of speed and its interpretation within a graphical setting. 相似文献
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J. Wiedmann 《NoDEA : Nonlinear Differential Equations and Applications》1997,4(1):133-148
In this paper we prove the existence of a classical solution of the thermistor problem.
Received May 15, 1995 相似文献
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CM Silva MF Duarte ML Mira MH Florêncio K Versluis AJ Heck 《Rapid communications in mass spectrometry : RCM》1999,13(12):1098-1103
Fast atom bombardment, combined with high-energy collision-induced tandem mass spectrometry, has been used to investigate gas-phase metal-ion interactions with captopril, enalaprilat and lisinopril, all angiotensin-converting enzyme inhibitors.Suggestions for the location of metal-binding sites are presented. For captopril, metal binding occurs most likely at both the sulphur and the nitrogen atom. For enalaprilat and lisinopril, binding preferably occurs at the amine nitrogen. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
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W. Möslinger F. Reiss F. Utz R. Hefelmann J. Tillmanns A. Splittgerber A. Reinsch E. Fritzmann A. W. Kaniss N. Gerber P. Wieske M. Riegel M. Siegfeld J. Adorjan H. Lührig F. Wiedmann A. Behre O. Jensen M. Henseval G. Mullie G. Benz S. Rothenfusser E. von Ernyei F. Reissu und P. Sommerfeld 《Fresenius' Journal of Analytical Chemistry》1912,51(7-8):519-527
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