Lehigh University

About: Lehigh University is a education organization based out in Bethlehem, Pennsylvania, United States. It is known for research contribution in the topics: Catalysis & Fracture mechanics. The organization has 12684 authors who have published 26550 publications receiving 770061 citations.

Classroom-based functional and adjunctive assessments: proactive approaches to intervention selection for adolescents with attention deficit hyperactivity disorder

Abstract: The present investigation evaluated the utility of classroom-based functional and adjunctive assessments of problem behaviors for 2 adolescents who met diagnostic criteria for attention deficit hyperactivity disorder (ADHD) and comorbid oppositional defiant disorder (ODD). For children with ADHD-ODD, environmental classroom variables, when systematically manipulated by teachers, were related to the occurrence and nonoccurrence of problem behaviors. Classroom interventions derived from information that was obtained during functional and adjunctive assessments and from subsequent analyses resulted in substantial reductions in problem behaviors. Teacher and student consumer satisfaction ratings indicated that the interventions were effective and feasible in the classroom setting.

Mechanisms of Pearlite Spheroidization

Abstract: A study of the mechanisms of pearlite spheroidization under static annealing conditions was carried out in two materials — AISI 1080 steel and pure Fe-C alloy. By electrolytically etching away the ferrite matrix, the morphology of the cementite phase was directly investigatedvia SEM and TEM techniques. It was clearly observed that the initiation and development of spheroidization are associated with morphological faults such as terminations, holes, and fissures in the cementite plates. During spheroidization the recession of terminations and the expansion of holes and fissures led to the break-up of large cementite plates into small segments. The migration of these faults is anisotropic. The preferred orientations, [010] and [210] directions in the (001) cementite plane, were determined by TEM analysis. This anisotropic morphological change is attributed to the anisotropy of the α/Fe3C interfacial energy. All the experimental evidence strongly supports the idea that the fault migration theory is the main mechanism governing spheroidization.