Elastic waves in heterogeneous bars of varying cross-section

The propagation of elastic waves in a heterogeneous bar of variable cross-sectional area is investigated via use of the method of characteristics andthe Laplace transform technique. The Young's modulus and density are assumed to be representable as either power law or exponential distributions in the axial coordinate. The transform method is used to establish an infinite number of multi-parameter solutions in closed form for either a stress, velocity or displacement type boundary condition. The numerical characteristic computations show excellent agreement when compared to the transform solutions, and are then used to obtain additional solutions not attainable by the transform method. Detailed results and conclusions for a bar of ogival cross-section are given for a wide range of inhomogeneity.     

Does Inducing Students to Schedule Lecture Watching in Online Classes Improve Their Academic Performance? An Experimental Analysis of a Time Management Intervention

Research in Higher Education - Time management skills are an essential component of college student success, especially in online classes. Through a randomized control trial of students in a...     

Do, Show, and Tell: Children's Event Memories Acquired through Direct Experience, Observation, and Stories

To investigate how source of event information influences children's event representations, 5- and 6-year-old children were exposed to a novel event through direct experience, observation, or a story. 2 of the 4 scenes comprising the event contained actions that were logically organized, and the remaining 2 scenes contained actions that were arbitrary in their organization. Children received either 1 or 3 exposures to the event. For children receiving multiple exposures, 2 scenes contained actions that varied across exposures. A few days following their last exposure, children were asked to verbally recall and reenact the event. Reports were generally more complete, organized, and accurate when the event was directly experienced compared to when it was observed or heard about through a story. However, the impact of information source interacted with interview (recall, reenactment) and number of event exposures. Furthermore, children's sensitivity to event structure was dependent on information source and exposure. These results highlight the importance of information source in the formation of children's event representations.     

LIVING THE QUESTIONS: RILKE'S CHALLENGE TO OUR QUEST FOR CERTAINTY

A bstract .  In this essay, Mordechai Gordon explores the significance of Rilke's challenge to "live the questions" and embrace uncertainty with respect to the quest for certainty in education. The quest for certainty in education refers to our desire to gain a sense of psychological security and more control over a field that is fundamentally indeterminate. This quest implies an unwillingness to live with the inherent complexities and risks of education. After exploring the meaning and import of Rilke's challenge and comparing it to the position of Socrates, Gordon uses Rilke's insight to analyze a specific educational experience and then discusses some of its educational implications for teacher education.     

SCAN: A method of community collaboration

Recent research has highlighted the complexity of the battered child syndrome. Clinical experience suggests that treatment of troubled families is a long-term process, draining financial resources of agencies and emotional resources of professionals. The need to provide support and case consultation to professionals working in the area of child abuse and neglect evolved in the establishment, in 1968, of the Suspected Child Abuse and Neglect (SCAN) Program at Children's Hospital, Pittsburgh, Pennsylvania. This program provides an effective method of intervention through identification, consultation, referral and follow-up of at-risk families. Weekly meetings offer multi-disciplinary case coordination, treatment recommendations, and a channel of communication for representatives of community agencies. This paper traces the history and present status of the SCAN Program, as well as the role of SCAN as a force for change of community attitudes.