Search

The Hanson Formation, Antarctica, consists of interbedded sandstones and tuffaceous rocks of Early Jurassic age. The sandstones, pebbly to medium-grained, range between quartzo-feldspathic and volcaniclastic, with some of the former being coarse-grained arkoses that imply proximal sources. Geochronology of detrital zircons provides evidence for source rock ages, whereas sandstone petrology demonstrates a mixed provenance. Tuffaceous strata are reworked fine to very fine-grained tuffs resulting from distal Plinian eruptions. Dated tuffs provide time constraints on the duration of volcanism. The sandstones and tuffs accumulated in a rift environment. Geochemically the tuffs are rhyolitic in composition, and the Sr and Nd isotope data together with the patterns on multi-element diagrams suggest they were derived from a volcanic arc, which is interpreted to have been located along the West Antarctic Gondwana margin. The silicic volcanism extends the distribution and timing of magmatism in the Early Jurassic along that margin. The Early Jurassic extensional regime was delimited by the plate margin region and the East Antarctic craton. The rift valley system along the East Antarctic craton margin, in which the Hanson strata accumulated, was the focus for subsequent emplacement of the intrusive and extrusive rocks of the Lower Jurassic Ferrar Large Igneous Province. The Early Jurassic extensional rifts may have been reactivated during Cretaceous-Cenozoic development of the West Antarctic Rift System. © 2017 Cambridge University Press.

The purpose of this paper is to introduce new invariants of Cohen–Macaulay local rings. Our focus is the class of Cohen–Macaulay local rings that admit a canonical ideal. Attached to each such ring R with a canonical ideal C, there are integers–the type of R, the reduction number of C–that provide valuable metrics to express the deviation of R from being a Gorenstein ring. We enlarge this list with other integers–the roots of R and several canonical degrees. The latter are multiplicity based functions of the Rees algebra of C. © 2017 Elsevier Inc.

A mixed-methods study was undertaken with 118 biology students in two urban high schools. A Student-Centered Adaptable Learning Environment (SCALE) was created to improve engagement from affective and cognitive perspectives using choice, creativity and technological allowances. Results demonstrated that fast and slow learners are generally separated by about 30 min in terms of inputting speeds, but can be as much as 65 min apart from one another. Given that traditional classrooms afford students only 45 min in which to learn, static time could have become a source of inequity in public schools. SCALE optimally allowed for the dynamic use of time in constrained periods, therefore reducing and even eliminating any negative relationships between speed of learning and resultant achievement gains in the block setting. Especially benefitting from their ability to maneuver were the slowest learners, who showed the largest achievement improvements in either time interval amongst ability groupings. As learning speed can be the most critical contributing component of resultant educational outcomes, providing students the ability to use time dynamically should be considered as a feasible solution to helping teachers reestablish equity in mixed-ability classrooms in public schools. © 2017, Springer Science+Business Media Dordrecht.

Adoption of Materials Science and Engineering (MSE) into the pre-college classroom is an ideal strategy for addressing Next Generation Science Standards (NGSS), specifically the Science and Engineering Practices. MSE offers core science and engineering topics that can be incorporated into existing Science, Technology, Engineering, and Mathematic (STEM) curricula through teaching modules. Using MSE as a teaching vehicle, the Center for Research on Interface Structures and Phenomena (CRISP) conducted a series of small-scale studies of its teacher professional development workshops and a student summer program, along with related teaching modules, in an effort to measure the contribution MSE has on students and K-12 STEM educators. Based on participant survey feedback, CRISP found improvement in students' MSE knowledge, interests, and career goals. For teachers, in addition to improving their MSE knowledge, they also increased their comfort and confidence in teaching MSE concepts in their classroom. These results provide evidence for the use of MSE modules as productive teaching tools for NGSS Science and Engineering Practices, as well as producing workforce-competitive STEM students. Copyright © Materials Research Society 2017.

An autonomous learner has developed an intrinsic motivation that drives him or her to pursue learning for the inherent satisfaction and enjoyment that stems from the acquisition of knowledge. This chapter presents strategies for teachers to develop a classroom of more autonomous learners. In addition to some strategies and sequencing of activities to maximize their impact, the chapter presents Universal Design for Learning as a framework for thinking about all teaching and ways to apply differentiated instruction to meet the needs of all learners. While there is a focus on the experience of a novice teacher, the content of this chapter is relevant for all educators looking to reinvigorate their practice to empower students to be more in command of their own learning.

Given the demographics of youth served by the child welfare system, culturally responsive approaches are critical to effective social work practice and desperately needed. Like many adolescents who grow up in the child welfare system, Paul, a White adolescent male in foster care, was beset by a lack of adequate environmental resources and multiple stressors and had little hope or motivation to work on improving his situation. This article highlights the author's use of self as an African American male therapist who worked with Paul, using a Winnicottian and caring framework. Because child welfare workers are often overburdened by the demands of work, including large caseloads and clients with few to no resources, they find it difficult to consistently provide empathic and caring behaviors for their clients. The author highlights his therapeutic work and struggles with Paul and offers cultural insights and Winnicottian strategies when working with adolescents in the child welfare system who are ultimately in need of permanency and stability.

The Patient Protection and Affordable Care Act came into existence at a time when the president’s ability to lead the public was in question, political polarization had intensified, and the media environment appeared ever more fragmented, fast-moving, and resistant to control. Under such circumstances, how can contemporary American presidents such as Barack Obama build and maintain support for themselves and their policies, particularly as controversies arise? Using case studies of major contests over how key elements of the Affordable Care Act would be framed, and analysis of how those frames fared in influential and popular U.S. news sources, Hopper examines the conditions under which the president can effectively shape public debates today. She argues that despite the difficult political and communications context, the president retains substantial advantages in framing major controversial issues for the media and the public. These presidential framing advantages are conditional, however, and Hopper explores the factors that help make presidential frames more or less likely to gain hold in the news today. More so than in the past, an element of unpredictability in this news environment means that in pursuing favorable messaging, the president and his surrogates may also generate some unintentional consequences in how issues are portrayed to the public. Presidential frames can evolve with unfolding events to take on new meanings and applications, a process facilitated alternately by supporters, opponents, and media actors. Still, media figures and political opponents remain largely reactive to presidential communications, even as some seek to publicize and exploit weaknesses in the administration’s narratives. A close look at these recent cases casts new light on the scholarly debate surrounding the president’s ability to persuasively communicate and challenges conventional wisdom that the 21st century media largely present an unmanageable news environment for the White House. Presidential Framing in the 21st Century News Media engages with current events in American politics, focusing on the Obama Administration and the Affordable Care Act, while also reflecting upon the state of the American presidency, the news media, and the public in ways that have substantial implications for all of these actors, not merely in the present, but into the future, making it a compelling read for scholars of Political Science, Media Studies, Communication Studies, and Public Policy. © 2017 Taylor & Francis.

Selecting the order of verifier in a serial fusion based multi-biometric system is a crucial parameter to fix because of its high impact on verification errors. A wrong choice of verifier order might lead to tremendous user inconvenience by denying a large number of genuine users and might cause severe security breach by accepting impostors frequently. Unfortunately, this design issue has been poorly investigated in multi-biometric literature. In this paper, we address this design issue by performing experiments using three different serial fusion based multi-biometric verification schemes, in particular (1) symmetric scheme, (2) SPRT-based scheme, and (3) Marcialis et al.’s scheme. We experimented on publicly available NIST-BSSR1 multi-modal database. We tested 24 orders—all possible orders originated from four individual verifiers—on a four-stage biometric verification system. Our experimental results show that the verifier order “best-to-worst”, where the best performing individual verifier is placed in the first stage, the next best performing individual verifier is placed in the second stage, and so on, is the top performing order for all three serial fusion schemes mentioned above.

America’s strategy of containment, designed to confront postwar Soviet aggression, real and perceived, grew out of a series of disparate and seemingly unrelated conflicts. Thus the clash over the future of defeated Germany was direct, immediate and of obvious importance for vital United States interests in Europe and the world. By contrast, the communist insurgency in Greece was originally perceived as a basically domestic affair of a small country in a remote region of little strategic value. Yet the Truman Doctrine, which paved the way for containment’s gradual global implementation—Marshall Plan, Berlin airlift, NATO, wars in Korea and Indochina—was ostensibly focused primarily on Greece. After remaining a benevolent but deliberately passive observer of turmoil and violence in Greece, Washington boldly replaced Britain as the foreign patron of that small and troubled Balkan state. This study documents the transformation of United States policy toward Greece, and the birth of containment. It argues that the change was fundamentally one of perceptions of the nature of Soviet policy itself within the Truman administration, rather than of realities in Greece. In retrospect, Greece was an unlikely springboard for launching the strategy of containing Moscow’s ideology and power. The significance of the communist threat in Greece was more a matter of alarmist assumptions, loose perceptions and questionable symbolism than of hard facts and geostrategic realities. But in human affairs perceptions and symbolism are important, especially if clothed in an aura of success, as was the application of containment in Greece.

This selected overview of audiovisual (AV) speech perception examines the influence of visible articulatory information on what is heard. Thought to be a cross-cultural phenomenon that emerges early in typical language development, variables that influence AV speech perception include properties of the visual and the auditory signal, attentional demands, and individual differences. A brief review of the existing neurobiological evidence on how visual information influences heard speech indicates potential loci, timing, and facilitatory effects of AV over auditory only speech. The current literature on AV speech in certain clinical populations (individuals with an autism spectrum disorder, developmental language disorder, or hearing loss) reveals differences in processing that may inform interventions. Finally, a new method of assessing AV speech that does not require obvious cross-category mismatch or auditory noise was presented as a novel approach for investigators.