SRI International

About: SRI International is a nonprofit organization based out in Menlo Park, California, United States. It is known for research contribution in the topics: Ionosphere & Laser. The organization has 7222 authors who have published 13102 publications receiving 660724 citations. The organization is also known as: Stanford Research Institute & SRI.

Using Social Network Analysis to Study How Collegial Interactions Can Augment Teacher Learning from External Professional Development.

Abstract: This article presents an analysis showing how collegial interactions can augment the mechanism of teachers’ learning from professional development. The analysis relies on social network data and self-reports of writing instructional practices from teachers in 20 different schools that were part of a longitudinal study of the National Writing Project’s partnership activities. The results indicate that both organized professional development and interactions with colleagues who gained instructional expertise from participating in prior professional development were associated with the extent to which teachers changed their writing processes instruction. Furthermore, the effects of professional development varied by teachers’ baseline practices. The study illustrates the potential for using data on teachers’ social networks to investigate indirect effects of professional development and the variation in professional development effects associated with different initial levels of expertise.

On the enigma of day-to-day variability in equatorial spread F

Abstract: [1] We show that large-scale wave structure (LSWS), in plasma density in the bottomside F layer, is a hitherto unheralded contributor to the long-standing enigma of day-to-day variability in equatorial spread F (ESF). Little is known about LSWS; it seems to appear in altitude near a vertical shear in zonal plasma drift, during the post-sunset rise of the F layer, and its growth via an interchange instability appears to predispose quasi-periodically spaced regions to development of plasma bubbles. First indications are that LSWS development is necessary and sufficient for ESF occurrence. We suggest that variability in LSWS development, perhaps together with the shear in zonal drift, may contribute to day-to-day ESF variability. A need revealed by this study is that a cluster of distributed sensors, not isolated ones, is necessary to pursue the problem of day-to-day variability.

Map merging for distributed robot navigation

Abstract: A set of robots mapping an area can potentially combine their information to produce a distributed map more efficiently than a single robot alone. We describe a general framework for distributed map building in the presence of uncertain communication. Within this framework, we then present a technical solution to the key decision problem of determining relative location within partial maps.

Structural Stability and Conductivity of Phase-Stabilized Cubic Bismuth Oxides

Abstract: Bismuth oxide, when stabilized in the face-centered cubic phase by lanthanide doping, has one of the highest oxygen-ion conductivities among all solid oxide electrolytes. We previously reported a time-dependent aging phenomenon in phase-stabilized bismuth oxides that involves ordering of the anion sublattice, as distinct from a crystallographic phase change, and results in decreased conductivity. In this paper, we report on the structural stability of the disordered lattice in terms of aging, as a function of both dopant species and dopant concentration. The aging rate decreases with both increased dopant cation radius and increased dopant concentration.

Thirty-six-month outcomes for families of children who have disabilities and participated in early intervention.

Abstract: Objective. Infants and toddlers with disabilities in the United States and their families are eligible for early intervention services under Part C of the Individuals With Disabilities Education Act. The purpose of this study was to assess family outcomes at the end of early intervention (near the child’s third birthday). Methods. A nationally representative sample of 2586 parents in 20 states completed a 40-minute telephone interview on or near their child’s third birthday. This article summarizes data related to perceived family outcomes at the end of early intervention. Results. At the end of early intervention, most parents felt competent in caring for their children, advocating for services, and gaining access to formal and informal supports. They also were generally optimistic about the future. Most (82%) parents believed that their family was better off as a result of early intervention. Parents were somewhat less positive in their perceived ability to deal with their child’s behavior problems or gain access to community resources, and lower family outcome scores were found for parents of minority children, children with health problems, and children who were living with a single adult. Conclusion. Results suggest that Part C early intervention provides important supports for families of young children with disabilities. The findings reinforce the need for experimental research to identify factors that are most likely to lead to successful outcomes for all families. In the meantime, early identification and expeditious referral are important so that maximum benefit can be realized for children with disabilities and their families.