楔式制动器设计提高了线控刹车的性能

采用电子楔式制动器（Electronic Wedge Brake,EWB）,现在可以设计12V线控刹车了!EWB是去年法兰克福车展上电子和机械电子产品开发商Siemens VDO推出的.     

Die Konstruktvalidität des Allgemeinen Sportmotorischen Tests für Kinder

Whereas numerous studies have confirmed the objectivity and reliability of the “ Allgemeine Sportmotorische Test für Kinder” (AST, a general motor fitness and coordination test for children), examinations of its construct validity reveal that: (1) the few available findings fail to confirm the theoretically predicted distinction between the latent variables of condition and coordination, and (2) no studies so far have examined its item homogeneity, even though the test recommends computing a sum score to provide a general estimate of motor fitness. Confirmatory factor analyses show that the two latent variables condition and coordination cannot be extracted from the AST. Models with different latent variables also cannot be confirmed, too. Analyses based on IRT models, in contrast, reveal that one can distinguish between two qualitative classes of persons who are associated with either better running performance combined with lower throwing performance or better throwing performance combined with lower running performance. Nonetheless, it should be noted that class membership does not remain constant over time. In sum, results based on classical and probabilistic test theory negate the ability assumption underlying the AST. For practical assessments of a skill-specific performance, this means that it only seems justifiable to use a sum score for the locomotion items and a sum score for the object manipulation items.     

Structuring and sequencing of complex text-picture combinations

This study investigates the structuring and sequencing of a special type of verbal-pictorial learning material, namely “explanative illustrations” (Mayer, 1993). In such illustrations verbal and pictorial parts form an integrated whole with text embedded in the pictures and vice versa. Due to their complexity such instructing illustrations impose high demands on information processing. From the viewpoint of instruction one may ask how the reception of such explanative illustrations may be supported by an appropriate structure and sequence of the content. In two empirical investigations three types of content structures and sequences were compared to each other: (1) a top-down sequence (based on assumptions of the “Elaboration Theory”, Reigeluth, 1987b) from the whole to details which shows how details are embedded within the larger context), (2) a bottom-up sequence from details to the whole, (3) the presentation as a whole (as in print).     

The passionate scholar: A mid-life,woman doctoral student's quest for voice

The feminist, esthetic, cooperative inquiry described in this article is the first longitudinal study to trace the development of scholarly identity in a group of mid-life women participants during their doctoral years. This 18-month project involved an experiential workshop and four reunions shaped around the metaphor of the hero's journey grounded in feminist pedagogy and expressive methods. Entering doctoral programs with voices made tenuous by life events characteristic of mid-life, participants' scholarly development was intimately linked with their recovery of personal voice and the development of an authentic sense of self. Expressive methods as well as group support were integral to participants developing a scholarly identity that manifested itself in passionate dissertation scholarship. This suggests that participants' scholarly identity development transcended the intellectual and involved psychological, emotional, and spiritual dimensions. Based on these findings, doctoral educators are encouraged to create experiences that offer mid-life women opportunities to reflect on their doctoral journeys within a community of scholarly caring through the creative mediums of metaphor; esthetic, expressive representation; and dialogue.     

Lower extremity kinematics of athletics curve sprinting

Curve running requires the generation of centripetal force altering the movement pattern in comparison to the straight path run. The question arises which kinematic modulations emerge while bend sprinting at high velocities. It has been suggested that during curve sprints the legs fulfil different functions. A three-dimensional motion analysis (16 high-speed cameras) was conducted to compare the segmental kinematics of the lower extremity during the stance phases of linear and curve sprints (radius: 36.5 m) of six sprinters of national competitive level. Peak joint angles substantially differed in the frontal and transversal plane whereas sagittal plane kinematics remained unchanged. During the prolonged left stance phase (left: 107.5 ms, right: 95.7 ms, straight: 104.4 ms) the maximum values of ankle eversion (left: 12.7°, right: 2.6°, straight: 6.6°), hip adduction (left: 13.8°, right: 5.5°, straight: 8.8°) and hip external rotation (left: 21.6°, right: 12.9°, straight: 16.7°) were significantly higher. The inside leg seemed to stabilise the movement in the frontal plane (eversion–adduction strategy) whereas the outside leg provided and controlled the motion in the horizontal plane (rotation strategy). These results extend the principal understanding of the effects of curve sprinting on lower extremity kinematics. This helps to increase the understanding of nonlinear human bipedal locomotion, which in turn might lead to improvements in athletic performance and injury prevention.     

Zur Lage der Erziehungssoziologie in der Bundesrepublik Deutschland

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