Alleviating Praxis Shock: Induction Policy and Programming for Urban Music Educators

ERIC Educational Resources Information Center

Shaw, Julia T.

2018-01-01

An integral part of a teacher learning continuum ranging from preservice education to professional development for experienced educators, new teacher induction holds particular potential to effect change in urban education. Accordingly, this article offers recommendations for induction-related policy and programming capable of supporting beginning…

Integrating Service-Learning Pedagogy for Preservice Elementary Teachers' Science Identity Development

ERIC Educational Resources Information Center

Wilson, Rachel E.; Bradbury, Leslie U.; McGlasson, Martha A.

2015-01-01

The purpose of this article is to explore how preservice elementary teachers (PSETs) interpreted their service-learning experiences within a pre-methods environmentally focused course and how their interpretations shaped their science teaching identities. Along a continuum of service-learning experiences were events that emphasized science…

Distinguishing Models of Professional Development: The Case of an Adaptive Model's Impact on Teachers' Knowledge, Instruction, and Student Achievement

ERIC Educational Resources Information Center

Koellner, Karen; Jacobs, Jennifer

2015-01-01

We posit that professional development (PD) models fall on a continuum from highly adaptive to highly specified, and that these constructs provide a productive way to characterize and distinguish among models. The study reported here examines the impact of an adaptive mathematics PD model on teachers' knowledge and instructional practices as well…

Teachers as Child Advocates: A Continuum of Involvement.

ERIC Educational Resources Information Center

Lindamood, Judy B.

1995-01-01

Describes the steps to increasing levels of teacher involvement in child advocacy. Steps range from "dreamer" with a vision of a better condition, to "volunteer" who gives time and energy without compensation, to "fighter" who uses conflict and dissension to achieve goals. Suggests that this simple continuum encourages teachers to become involved…

A Plea for a Statewide Content Continuum.

ERIC Educational Resources Information Center

Swiers, Alma

1979-01-01

Suggests that elementary self-contained classroom teachers be provided with specific statewide content guidelines. The content should be based upon Piaget's theory of cognitive development. (Author/KC)

Teachers' opinion about learning continuum based on student's level of competence and specific pedagogical material in classification topics

NASA Astrophysics Data System (ADS)

Andriani, Aldina Eka; Subali, Bambang

2017-08-01

This research discusses learning continuum development for designing a curriculum. The objective of this study is to gather the opinion of public junior and senior high school teachers about learning continuum based on student's level of competence and specific pedagogical material in classification topics. This research was conducted in Yogyakarta province from October 2016 to January 2017. This research utilizes a descriptive survey method. Respondents in this study consist of 281 science teachers at junior and senior high school in Yogyakarta city and 4 regencies namely Sleman, Bantul, Kulonprogo, and Gunung Kidul. The sample were taken using a census. The collection of data used questionnaire that had been validated from the aspects of construct validity and experts judgements. Data were analyzed using a descriptive analysis technique. The results of the analysis show that the opinions of teachers regarding specific pedagogical material in classification topics of living things at the junior high school taught in grade VII to the ability level of C2 (Understanding). At senior high school level, it is taught in grade X with the ability level C2 (Understanding). Based on these results, it can be concluded that the opinions of teachers still refer to the current syllabus and curriculum so that the teachers do not have pure opinions about the student's competence level in classification topics that should be taught at the level of the grade in accordance with the level of corresponding competency.

Teachers' instructional goals for science practice: Identifying knowledge gaps using cultural-historical activity theory (CHAT)

NASA Astrophysics Data System (ADS)

Farrar, Cynthia Hamen

In AP Biology, the course goal, with respect to scientific acts and reasoning, has recently shifted toward a reform goal of science practice, where the goal is for students to have a scientific perspective that views science as a practice of a community rather than a body of knowledge. Given this recent shift, this study is interested in the gaps that may exist between an individual teacher's instructional goal and the goals of the AP Biology course. A Cultural-Historical Activity Theory (CHAT) methodology and perspective is used to analyze four teachers' knowledge, practice, and learning. Teachers have content knowledge for teaching, a form of knowledge that is unique for teaching called specialized content knowledge. This specialized content knowledge (SCK) defines their instructional goals, the student outcomes they ultimately aim to achieve with their students. The study employs a cultural-historical continuum of scientific acts and reasoning, which represents the development of the AP Biology goal over time, to study gaps in their instructional goal. The study also analyzes the contradictions within their teaching practice and how teachers address those contradictions to shift their instructional practice and learn. The findings suggest that teachers have different interpretations of the AP Biology goals of science practice, placing their instructional goal at different points along the continuum. Based on the location of their instructional goal, different micro-communities of teachers exist along the continuum, comprised of teachers with a shared goal, language, and culture of their AP Biology teaching. The in-depth study of one teacher's AP Biology teaching, using a CHAT perspective, provides a means for studying the mechanisms that connect SCK to classroom actions and ultimately to instructional practice. CHAT also reveals the nature and importance of contradictions or cognitive dissonance in teacher learning and the types of support teachers need to recognize contradictions and to internalize and set their instructional goal, facilitating their learning. Without recognition of contradictions, some of these micro-communities are not aware that their instruction is not in line with the AP Biology goal of science practice. An in-depth look at teacher learning revealed the criticality of reflective practice and the need for an "expert" within a teacher's community to facilitate = learning and develop SCK to incorporate science practice in classroom instruction.

Exploring the Position of Curriculum Studies across the Continuum of Teacher Education in Ireland

ERIC Educational Resources Information Center

Lynch, Raymond; McCormack, Orla; Hennessy, Jennifer

2017-01-01

Curriculum, while often narrowly defined, is a contested space that stimulates continuing international debate, yet the importance of curriculum studies is frequently overlooked across the continuum of teacher education. Within the Irish context a technicist interpretation of curriculum studies, focusing primarily of subject knowledge and…

Scaffolding the Inquiry Continuum and the Constitution of Identity

ERIC Educational Resources Information Center

Melville, Wayne; Bartley, Anthony; Fazio, Xavier

2013-01-01

This article considers the impact of scaffolding on pre-service science teachers' constitution of identities as teachers of inquiry. This scaffolding has consisted of 2 major components, a unit on current electricity which encompasses the inquiry continuum and an open inquiry which is situated in context of classroom practice. Our analysis…

A Case Study on Science Teacher Leadership to Address Diversity and Equity Through Professional Development

NASA Astrophysics Data System (ADS)

Doraiswamy, Nithya

This qualitative case study focused on the multifaceted issue of exploring science teacher leaders understanding and addressing of issues of diversity and equity with peers through professional development. The purpose of the study was to highlight the opportunities and barriers to the addressing of issues of diversity and equity through the work of a community of teachers leaders in science professional development. To frame this study, the researcher drew from the interdisciplinary field of multicultural education, transformative learning, and teacher leadership. In drawing out the connections from these vast bodies of literature, the study speaks to the need of both, creating teacher leaders in science education who are capable of meeting the twin demands of excellence and equity, and also attending to the challenges in the professional learning continuums of teachers leaders and their peers towards addressing issues of diversity and equity in science education.

The learning continuum of ecology based on teachers' opinion about student's level of competence and specific pedagogical learning material

NASA Astrophysics Data System (ADS)

Pramesti, Indah Cahaya; Subali, Bambang

2017-08-01

This study aims at designing learning continuum for developing a curriculum based on teachers' opinion about student's level of competence and specific pedagogical learning material on ecological aspect targeted for students of Primary and Secondary Education. This research is a descriptive research using survey methods. The researchers conducted a census by distributing questionnaires that had been validated from the aspects of construct validity and experts judgements to 147 natural science teachers at junior high school and 134 Biology teachers at senior high school as a population throughout 4 regencies and 1 city in Yogyakarta Special Region.. Data analysis techniques used descriptive analysis. In conclusion, teacher's opinion is influenced by curriculum that exist today. According to the opinions of Natural Science teachers at Junior High School, most of the ecological aspects such as characteristics of biomes, characteristics of ecosystems, characteristics of communities, characteristics of populations, etc. should be taught in grade VII with the level of competence: to understand (C2), while Biology teachers at Senior High School state that the ecological aspect should be taught in class X with the level of competence: to understand (C2), apply (C3) and analyze (C4). Teachers should be a privy in the formulation of the curriculum, so they're not only accept and apply the existing curriculum but also give opinions to improve the curriculum, especially in terms of ecology.

Teacher Quality Toolkit

ERIC Educational Resources Information Center

Lauer, Patricia A.; Dean, Ceri B.

2004-01-01

This Teacher Quality Toolkit aims to support the continuum of teacher learning by providing tools that institutions of higher education, districts, and schools can use to improve both preservice and inservice teacher education. The toolkit incorporates McREL?s accumulated knowledge and experience related to teacher quality and standards-based…

TEACHER TRAINING: How to Produce Better Math and Science Teachers.

PubMed

Mervis, J

2000-09-01

Two National Research Council panels have released new reports on improving science and math education in the United States. One panel says that the best way to improve teacher education is to make it a continuum, with school districts taking more responsibility for the initial preparation of new teachers and university faculty playing a bigger role in ongoing professional development. The other panel says that more recent science Ph.D.s would be willing to teach high school science and math if the government helped with the transition, if the certification process were compressed, and if they could retain ties to research.

Teacher Quality Toolkit. 2nd Edition

ERIC Educational Resources Information Center

Lauer, Patricia A.; Dean, Ceri B.; Martin-Glenn, Mya L.; Asensio, Margaret L.

2005-01-01

The Teacher Quality Toolkit addresses the continuum of teacher learning by providing tools that can be used to improve both preservice, and inservice teacher education. Each chapter provides self assessment tools that can guide progress toward improved teacher quality and describes resources for designing exemplary programs and practices. Chapters…

Research and Demonstration Projects: Programs for Gifted, January 1990-1991.

ERIC Educational Resources Information Center

Ohio State Dept. of Education, Columbus. Div. of Special Education.

Thirteen research and demonstration projects developed by Ohio school districts for the education of gifted students are described. The programs involve inservice teacher education; interdepartmental teamwork; collaboration with community and university resources; a continuum of services for gifted children in regular classrooms; learning options…

From Good to Great: Discussion Starter Tool

ERIC Educational Resources Information Center

Center on Great Teachers and Leaders, 2014

2014-01-01

In the report "From Good to Great: Exemplary Teachers Share Perspectives on Increasing Teacher Effectiveness across the Career Continuum," (See full report in ERIC at ED555657) National and State Teachers of the Year shared their views on what helped them become great teachers. This accompanying "Discussion Starter Tool" builds…

The Continuum of Teacher Learning

ERIC Educational Resources Information Center

Huebner, Tracy

2009-01-01

Many recent studies on teacher learning are grounded in the works of Rosenholtz (1989), Ball and Cohen (1999), and Putnam and Borko (2000). Their research, collectively, suggests that teacher learning occurs in at least two realms: the individual and the interpersonal. In the individual realm, teachers gain knowledge about content and pedagogy,…

A study of the continuum of integration of mathematics content with science concepts at the middle school level in West Virginia

NASA Astrophysics Data System (ADS)

Meisel, Edna Marie

The purpose of this study was to examine the practices and perceptions of regular education seventh grade middle school mathematics teachers in West Virginia concerning the integration of mathematics objectives with science concepts. In addition, this study also emphasized the use of integrated curriculum continuum models to study mathematics teachers' practices and perceptions for teaching mathematics objectives in connection with science concepts. It was argued that the integrated curriculum continuum model can be used to help educators begin to form a common definition of integrated curriculum. The population was described as the regular education seventh grade middle school mathematics teachers in West Virginia. The entire population (N = 173) was used as the participants in this study. Data was collected using an integrated curriculum practices and perceptions survey constructed by the researcher. This was a descriptive study that incorporated the Chi Square statistic to show trends in teacher practices and perceptions. Also, an ex post facto design, that incorporated the Mann-Whitney U statistic, was used to compare practices and perceptions between teachers grouped according to factors that influence teaching practices and perceptions. These factors included teaching certificate endorsement and teacher professional preparation. Results showed that the regular education seventh grade middle school mathematics teachers of West Virginia are teaching mathematics objectives mainly at a discipline-based level with no formal attempt for integration with science concepts. However, these teachers perceived that many of the mathematics objectives should be taught at varying levels of integration with science concepts. It was also shown that teachers who experienced professional preparation courses that emphasized integrated curriculum courses did teach many of the mathematics objectives at higher levels of integration with science than those teachers who did not experience integrated curriculum courses.

The inquiry continuum: Science teaching practices and student performance on standardized tests

NASA Astrophysics Data System (ADS)

Jernnigan, Laura Jane

Few research studies have been conducted related to inquiry-based scientific teaching methodologies and NCLB-required state testing. The purpose of this study was to examine the relationship between the strategies used by seventh-grade science teachers in Illinois and student scores on the Illinois Standards Achievement Test (ISAT) to aid in determining best practices/strategies for teaching middle school science. The literature review defines scientific inquiry by placing teaching strategies on a continuum of scientific inquiry methodologies from No Inquiry (Direct Instruction) through Authentic Inquiry. Five major divisions of scientific inquiry: structured inquiry, guided inquiry, learning cycle inquiry, open inquiry, and authentic inquiry, have been identified and described. These five divisions contain eight sub-categories: demonstrations; simple or hands-on activities; discovery learning; variations of learning cycles; problem-based, event-based, and project-based; and student inquiry, science partnerships, and Schwab's enquiry. Quantitative data were collected from pre- and posttests and surveys given to the participants: five seventh grade science teachers in four Academic Excellence Award and Spotlight Award schools and their 531 students. Findings revealed that teachers reported higher inquiry scores for themselves than for their students; the two greatest reported factors limiting teachers' use of inquiry were not enough time and concern about discipline and large class size. Although the correlation between total inquiry and mean difference of pre- and posttest scores was not statistically significant, the survey instrument indicated how often teachers used inquiry in their classes, not the type of inquiry used. Implications arose from the findings that increase the methodology debate between direction instruction and inquiry-based teaching strategies; teachers are very knowledgeable about the Illinois state standards, and various inquiry-based methods need to be stressed in undergraduate methods classes. While this study focused on the various types of scientific inquiry by creating a continuum of scientific inquiry methodologies, research using the continuum needs to be conducted to determine the various teaching styles of successful teachers.

A Study of Teacher-Learner Interactions: A Continuum Between Monologic and Dialogic Interactions.

PubMed

Kathard, Harsha; Pillay, Daisy; Pillay, Mershen

2015-07-01

Teachers and learners must be able to shift flexibly along the continuum of monologic and dialogic interactional repertoires to advance learning. This article describes how teachers and learners interacted during whole-class instruction along the continuum between monologic and dialogic interaction in primary school classrooms in Western Cape, South Africa. A video-observation method was used to analyze teacher-learner interactions (TLIs) across 15 lessons in intermediate-phase classrooms. TLIs were analyzed in relation to indicators such as authority, questions, feedback, explanation, metalevel connection, and collaboration. The transcriptions of TLIs were described using quantitative and qualitative techniques. The study found that teachers sustained dominant monologic interactions by asserting their authority, asking mainly closed-ended questions, and providing confirming/correcting feedback that constrained the interaction. Learners had limited opportunities for explanations or collaboration. Across most lessons, there were episodic shifts from monologic TLIs to transitional TLIs. These transitions were achieved by using mainly open-ended questions and feedback to expand the interaction. Dialogic TLIs were not evident. Monologic TLIs were dominant, closing down opportunities for communication. Although transitional TLIs were evident, they were episodic and showed the potential for opening interaction opportunities. The absence of dialogic TLIs suggested that collaborative engagement opportunities were unavailable. The opportunity for intervention to increase dialogic TLIs is discussed.

Creating a Context in the Early Childhood Classroom. Spotlight: Cosmic Education.

ERIC Educational Resources Information Center

Engel, Janet Wolfe

2002-01-01

Describes how to create a context for Cosmic Education, which develops an awareness of the interrelationships between the elements of the cosmos and the individual's place in that continuum, in the early childhood Montessori classroom. Discusses the importance of meeting the child's developmental needs, and preparing the adult teacher spiritually,…

Professional Learning in a Digital Age

ERIC Educational Resources Information Center

Brooks, Charmaine; Gibson, Susan

2012-01-01

While professional development (PD) has always been central to the teaching profession, increasingly traditional models of PD are out of step with contemporary ways of learning. Commiserate with the literature, we see the field moving along a continuum which reflects changes in what, how and when teachers learn. Following a brief sketch of the…

Elementary teachers' ideas about, planning for and implementation of learner-directed and teacher-directed inquiry: A mixed methods study

NASA Astrophysics Data System (ADS)

Biggers, Mandy Sue

Using a framework for variations of classroom inquiry (National Research Council [NRC], 2000, p. 29), this study explored 40 inservice elementary teachers' planning, modification, and enactment of kit-based science curriculum materials. As part of the study, a new observation protocol was modified from an existing protocol (Practices of Science Observation Protocol [P-SOP]) to measure the amount of teacher direction in science inquiry lessons (Practices of Science Observation Protocol + Directedness [P-SOPd]). An embedded mixed methods design was employed to investigate four questions: 1. How valid and reliable is the P-SOPd? 2. In what ways do inservice elementary teachers adapt existing elementary science curriculum materials across the inquiry continuum? 3. What is the relationship between the overall quality of inquiry and variations of inquiry in elementary teachers' enacted science instruction? 4. How do inservice elementary teachers' ideas about the inquiry continuum influence their adaptation of elementary science curriculum materials? Each teacher chose three lessons from a science unit for video-recorded observation, and submitted lesson plans for the three lessons. Lesson plans and videos were scored using the P-SOPd. The scores were also compared between the two protocols to determine if a correlation existed between the level of inquiry (measured on the P-SOP) and the amount of teacher direction (measured on the P-SOPd). Findings indicated no significant differences between planned and enacted lessons for the amount of teacher direction, but a correlation existed between the level of inquiry and the amount of teacher direction. In effect, the elementary teachers taught their science curriculum materials with a high level of fidelity for both the features of inquiry and the amount of teacher direction. A smaller group of three case study teachers were followed for the school year to give a more in-depth explanation of the quantitative findings. Case study findings revealed that the teachers' science instruction was teacher-directed while their conceptions of inquiry were student-directed. This study contributes to existing research on preservice teachers' learning about the continuum (Biggers & Forbes, 2012) and inservice teachers' ideas about the five features of inquiry (Biggers & Forbes, in press).

Induction and Mentoring: Levels of Student Teacher Understanding

ERIC Educational Resources Information Center

Wilkins, Elizabeth A.; Okrasinski, Jeanne E.

2015-01-01

The purpose of this study was to explore perspectives held by student teachers about induction and mentoring programs and how teacher education programs could contribute to a broader continuum of supports that span from preservice to in-service teaching. Using survey research, this mixed-method study sought to understand what student teachers from…

Solving Discipline Problems: Strategies for Classroom Teachers.

ERIC Educational Resources Information Center

Wolfgang, Charles H.; Glickman, Carl D.

This book provides classroom teachers with a variety of discipline models, techniques, methods, and constructs designed to enable them to move beyond a singular approach in handling classroom behavior problems. The book first discusses the Teacher Behavior Continuum (TBC) which shows the teacher the context of his or her own general behavior with…

New Vigor Propelling Training

ERIC Educational Resources Information Center

Sawchuk, Stephen

2010-01-01

With conversations about the best ways to evaluate teacher performance proliferating across the nation, preservice preparation could be the next stop on the teacher-quality continuum to receive a similarly high level of scrutiny. New models for preparing teachers, such as the yearlong apprenticeship or "residency" model, have received…

Linking Pupil and Teacher Competence in Reading and Mathematics in Vietnam

ERIC Educational Resources Information Center

Griffin, Patrick

2008-01-01

This article reports results derived from the national study of Grade 5 in Vietnamese primary schools in which teachers and pupils took tests in reading and mathematics. The test data were calibrated so that teacher and pupil results could be mapped onto the same continuum. Results showed that the overlapping tests for teachers and pupils were…

Moving Past "Right" or "Wrong" toward a Continuum of Young Children's Semantic Knowledge

ERIC Educational Resources Information Center

Christ, Tanya

2011-01-01

Vocabulary development is a critical goal for early childhood education. However, it is difficult for researchers and teachers to determine whether this goal is being met, given the limitations of current assessment tools. These tools tend to view word knowledge dichotomously--as right or wrong. A clear sense of children's depth of semantic…

Integrating Performance Assessments across a PK-20 Continuum: A Locally Developed Collaboration

ERIC Educational Resources Information Center

McCurdy, Kathryn; Reagan, Emilie Mitescu; Rogers, Audrey; Schram, Thomas

2018-01-01

A response to Stosich et al.'s (2018) article reviewing ways in which states have taken up performance assessments, this commentary seeks to extend the focus and use of performance assessments to preservice teacher education. As such, the authors describe statewide initiatives in New Hampshire that are working to integrate performance assessments…

Teacher Judgments of Students' Reading Abilities across a Continuum of Rating Methods and Achievement Measures

ERIC Educational Resources Information Center

Begeny, John C.; Krouse, Hailey E.; Brown, Kristina G.; Mann, Courtney M.

2011-01-01

Teacher judgments about students' academic abilities are important for instructional decision making and potential special education entitlement decisions. However, the small number of studies evaluating teachers' judgments are limited methodologically (e.g., sample size, procedural sophistication) and have yet to answer important questions…

Content-Focused Classrooms and Learning English: How Teachers Collaborate

ERIC Educational Resources Information Center

Creese, Angela

2010-01-01

This article looks at the possibilities of content-based instruction in mainstream English secondary schools. It considers the continuum from a language to content focus in classrooms where teachers collaborate. English as an additional language (EAL) and subject curriculum teachers work together to support young people while they simultaneously…

De-Marginalizing Science in the Early Elementary Classroom: Fostering Reform-Based Teacher Change through Professional Development, Accountability, and Addressing Teachers' Dilemmas

NASA Astrophysics Data System (ADS)

Berg, Alissa

To develop a scientifically literate populace, students must acquire the motivation and foundational skills for success in science beginning at an early age. Unfortunately, science instruction is often marginalized in elementary schools for reasons including teachers' lack of confidence in teaching science and an overemphasis on literacy and mathematics. This study employed a case study design to examine the impact of teachers' dilemmas, career stage, coaching, and other forms of support on elementary teachers' abilities to teach science more often and in more reform-based ways. The conceptual lenses used to guide this dissertation include the theory related to teacher change, dilemmas, reform-oriented science teaching, and the professional learning continuum. Findings suggest that teachers' dilemmas must be addressed in order for them to move toward more reform-based science teaching practices. It was found that how teachers reconcile their dilemmas is due in part to their career stage, level of readiness, and access to a more knowledgeable other who can assist them in learning and enacting reform-based instruction. Moreover, the likelihood and extent of teacher change appears to be related to teachers recognizing a need to change their practice, developing the capacity to change, feeling accountable to change, and possessing the motivation to change. Implications for teacher educators, professional development providers, and curriculum developers are presented. It is argued that teachers require support the length of their career and, to be effective, this support must be personalized to their diverse and changing needs and responsive to the context in which they teach.

Toward Facilitative Mentoring and Catalytic Interventions

ERIC Educational Resources Information Center

Smith, Melissa K.; Lewis, Marilyn

2015-01-01

In TESOL teacher mentoring, giving advice can be conceptualized as a continuum, ranging from directive to facilitative feedback. The goal, over time, is to lead toward the facilitative end of the continuum and specifically to catalytic interventions that encourage self-reflection and autonomous learning. This study begins by examining research on…

Didactic Dissonance: Teacher Roles in Computer Gaming Situations in Kindergartens

ERIC Educational Resources Information Center

Vangsnes, Vigdis; Økland, Nils Tore Gram

2015-01-01

In computer gaming situations in kindergartens, the pre-school teacher's function can be viewed in a continuum. At one extreme is the teacher who takes an intervening role and at the other extreme is the teacher who chooses to restrict herself/himself to an organising or distal role. This study shows that both the intervening position and the…

From Good to Great: Exemplary Teachers Share Perspectives on Increasing Teacher Effectiveness across the Career Continuum

ERIC Educational Resources Information Center

Behrstock-Sherratt, Ellen; Bassett, Katherine; Olson, Derek; Jacques, Catherine

2014-01-01

For well over a decade, teachers have been recognized as the single most important school-level factor influencing student achievement (Darling-Hammond, 2000; McCaffrey, Lockwood, Koretz, & Hamilton, 2003; Rivkin, Hanushek, & Kain, 2000; Rowan, Correnti & Miller, 2002; Wright, Horn, & Sanders, 1997). Tremendous public resources…

The Creative Curriculum[R] for Preschool: Developmental Continuum Assessment Toolkit for Ages 3-5.

ERIC Educational Resources Information Center

Dodge, Diane Trister; Colker, Laura J.; Heroman, Cate

Intended for use with the Creative Curriculum for Early Childhood, this integrated ongoing student assessment toolkit is designed for preschool teachers to help them focus on all aspects of a child's development, thereby giving them a way to ensure that all children in their classes are making progress. The assessment kit uses a strength-based…

Helping Teachers Teach Plasma Physics

NASA Astrophysics Data System (ADS)

Correll, Donald

2008-11-01

Lawrence Livermore National Laboratory's E/O program in Fusion Science and Plasma Physics now includes both `pre-service' as well as `in-service' high school science teacher professional development activities. Teachers are instructed and mentored by `master teachers' and LLNL plasma researchers working in concert. The Fusion/Plasma E/O program exploits a unique science education partnership that exists between LLNL's Science Education Program and the UC Davis Edward Teller Education Center. For `in-service' teachers, the Fusion & Astrophysics Teacher Research Academy (TRA) has four levels of workshops that are designed to give in-service high school science teachers experience in promoting and conducting research, most notably in the filed of plasma spectroscopy. Participating teachers in all four TRA levels may earn up to ten units of graduate credit from Cal-State University East Bay, and may apply these units toward a Masters of Science in Education. For `pre-service' teachers, the Science Teacher and Researcher (STAR) program, as a partnership with the California State University System, includes attracting undergraduate science majors to teaching careers by allowing them to pursue professional identities as both a research scientist as well as a science teacher. Participating `pre-service' STAR students are provided research internships at LLNL and work closely with the `in-service' TRA teachers. Results from the continuum `pre-service' to `in-service' science teacher professional development programs will be presented.

Adoption, adaptation, and abandonment: Appropriation of science education professional development learning

NASA Astrophysics Data System (ADS)

Longhurst, Max L.

Understanding factors that impact teacher utilization of learning from professional development is critical in order maximize the educational and financial investment in teacher professional learning. This study used a multicase mixed quantitative and qualitative methodology to investigate the factors that influence teacher adoption, adaption, or abandonment of learning from science teacher professional development. The theoretical framework of activity theory was identified as a useful way to investigate the phenomenon of teacher appropriation of pedagogical practices from professional development. This framework has the capacity to account for a multitude of elements in the context of a learning experience. In this study educational appropriation is understood through a continuum of how an educator acquires and implements both practical and conceptual aspects of learning from professional development within localized context. The variability associated with instructional changes made from professional development drives this inquiry to search for better understandings of the appropriation of pedagogical practices. Purposeful sampling was used to identify two participants from a group of eighth-grade science teachers engaged in professional development designed to investigate how cyber-enabled technologies might enhance instruction and learning in integrated science classrooms. The data from this investigation add to the literature of appropriation of instructional practices by connecting eight factors that influence conceptual and practical tools with the development of ownership of pedagogical practices in the appropriation hierarchy. Recommendations are shared with professional development developers, providers, and participants in anticipation that future science teaching experiences might be informed by findings from this study.

The evolution of science literacy: Examining intertextual connections and inquiry behaviors in the classroom

NASA Astrophysics Data System (ADS)

Manocchi-Verrino, Carol J.

A call for a new perspective of science literacy has been marked as the impetus of change in science education, suggesting that a meaning-making approach to literacy and inquiry are central to learning science. This research study explored how science literacy evolved in a classroom where this reconceptualized view of science literacy guided curriculum design and instruction. The teacher/researcher incorporated Interactive Science Notebooks (ISNs) and Interactive Reading Organizers and Comprehension Strategies (IROCS) into instructional materials. In a class consisting of 20 mainstream and special education students, this 7-week study collected data using Likert scales, stimulated recall interviews, a teacher/researcher journal, and students¡¦ position papers. A systematic design framework was used for the three-phase analysis. Hyperresearch RTM software facilitated the identification of open codes, an axial code, and frequency graphs. In order to develop insight into the relationship between questions, methods, and curriculum design recent recommendations for quality research in science education were considered in the methodology. The hypothesis formulated from the data suggests that science literacy evolves on a continuum, and the degree to which science literacy evolves on the continuum seems to be contingent upon their uses of intertextual connections and inquiry behaviors. Several notable insights emerged from the data which were used to guide curriculum, instruction, and assessment that promotes the development of science literacy in the middle school classroom. The study suggests a possible correlation between the use of intertextual connections and inquiry behaviors, and the use of a continuum in measuring the emergence of science literacy.

Pupil Control Ideology among Prospective South African and Indian Teachers

ERIC Educational Resources Information Center

Cherian, L.

2011-01-01

The purpose of teacher training programmes is to instil a humanistic ideology into the school curriculum. Unfortunately however, this is not always able to change the culture of a school. The Pupil Control Ideology (PCI) scale was designed to measure the pupil control orientation of the respondents (teachers) on a humanistic-custodial continuum.…

Autonomous Motivation for Teaching: How Self-Determined Teaching May Lead to Self-Determined Learning

ERIC Educational Resources Information Center

Roth, Guy; Assor, Avi; Kanat-Maymon, Yaniv; Kaplan, Haya

2007-01-01

This study examined teachers' experience of autonomous motivation for teaching and its correlates in teachers and students. It was hypothesized that teachers would perceive various motivations posited by E. L. Deci and R. M. Ryan's (2000) self-determination theory as falling along a continuum of autonomous motivation for teaching. Autonomous…

Teachers Teaching Students from a Multicultural Background: The Case of Malaysia

ERIC Educational Resources Information Center

Rajendran, Nagappan

2005-01-01

Teacher educators like talking about the pre-service--in-service continuum as a way of expressing their views, that inevitably, they are expected to play a multifaceted role in and outside of the classroom. In this respect, what is of greater concern is that many teachers are inadequately prepared to teach ethnically diverse students. Malaysia is…

Behavior Change in a Student with a Dual Diagnosis of Deafness and Pervasive Development Disorder: A Case Study

ERIC Educational Resources Information Center

Easterbrooks, S. R.; Handley, C. M.

2005-01-01

The broad term "pervasive developmental disorder" (PPD) describes a set of symptoms that occur along a continuum of severity; these symptoms are often referred to as "autism spectrum disorders" (ASDs). Little is known about the incidence and prevalence of ASDs among students who are deaf or hard of hearing (DHH). Teachers of DHH students, who must…

Evaluating the Relationship between Cognitive Style and Pre-Service Teachers' Preconceived Notions about Adopting Console Video Games for Use in Future Classrooms

ERIC Educational Resources Information Center

McDaniel, Rudy; Kenny, Robert

2013-01-01

This article explores the impact of perceptual cognitive styles on pre-service teachers' attitudes toward video games. Using a cognitive style continuum measuring field dependence and field independence, the authors conducted an exploratory study to measure the potential impact of cognitive style on pre-service teachers' dispositions towards the…

Latent profile analysis of sixth graders based on teacher ratings: Association with school dropout.

PubMed

Orpinas, Pamela; Raczynski, Katherine; Peters, Jaclyn Wetherington; Colman, Laura; Bandalos, Deborah

2015-12-01

The goal of this study was to identify meaningful groups of sixth graders with common characteristics based on teacher ratings of assets and maladaptive behaviors, describe dropout rates for each group, and examine the validity of these groups using students' self-reports. The sample consisted of racially diverse students (n = 675) attending sixth grade in public schools in Northeast Georgia. The majority of the sample was randomly selected; a smaller group was identified by teachers as high risk for aggression. Based on teacher ratings of externalizing behaviors, internalizing problems, academic skills, leadership, and social assets, latent profile analysis yielded 7 classes that can be displayed along a continuum: Well-Adapted, Average, Average-Social Skills Deficit, Internalizing, Externalizing, Disruptive Behavior with School Problems, and Severe Problems. Dropout rate was lowest for the Well-adapted class (4%) and highest for the Severe Problems class (58%). However, students in the Average-Social Skills Deficit class did not follow the continuum, with a large proportion of students who abandoned high school (29%). The proportion of students identified by teachers as high in aggression consistently increased across the continuum from none in the Well-Adapted class to 84% in the Severe Problems class. Students' self-reports were generally consistent with the latent profile classes. Students in the Well-Adapted class reported low aggression, drug use, and delinquency, and high life satisfaction; self-reports went in the opposite direction for the Disruptive Behaviors with School Problems class. Results highlight the importance of early interventions to improve academic performance, reduce externalizing behaviors, and enhance social assets. (c) 2015 APA, all rights reserved).

Weaving Mathematical Instructional Strategies into Inclusive Settings.

ERIC Educational Resources Information Center

Karp, Karen S.; Voltz, Deborah L.

2000-01-01

This article describes a framework that allows teachers in inclusive elementary settings to interweave instructional strategies from a variety of paradigms to meet individual learning needs in inclusive mathematics classes. Factors to be considered are highlighted and an instructional continuum from more teacher-centered strategies to more…

Estuche de evaluacion del continuo del desarrollo de El Curriculo Creativo (The Creative Curriculum Developmental Continuum Assessment Toolkit for Ages 3-5).

ERIC Educational Resources Information Center

Dodge, Diane Trister; Colker, Laura J.; Heroman, Cate

Intended for use with the Creative Curriculum for Early Childhood, this integrated ongoing student assessment toolkit, in Spanish, is designed for preschool teachers to help them focus on all aspects of a child's development, thereby giving them a way to ensure that all children in their classes are making progress. The assessment kit uses a…

The Socialization of Teachers: Career Rewards and Levels of Professional Concern.

ERIC Educational Resources Information Center

Driscoll, Amy

Teacher education, when viewed along a professional continuum from preservice level to beginning level to experienced level, involves a socialization phenomenon which is only minimally described or understood by the profession. Several aspects of the socialization process--career rewards, levels of professional concern, and perceptions of the…

Integrating Service-Learning Pedagogy for Preservice Elementary Teachers' Science Identity Development

NASA Astrophysics Data System (ADS)

Wilson, Rachel E.; Bradbury, Leslie U.; McGlasson, Martha A.

2015-04-01

The purpose of this article is to explore how preservice elementary teachers (PSETs) interpreted their service-learning experiences within a pre-methods environmentally focused course and how their interpretations shaped their science teaching identities. Along a continuum of service-learning experiences were events that emphasized science learning, that focused on science teaching, and that were transitional, with elements of both science learning and science teaching. These various service-learning experiences were designed to be "boundary experiences" for professional identity development (Geijsel & Meijers in Educational Studies, 3(4), 419-430, 2005), providing opportunities for PSETs to reflect on meanings in cultural contexts and how they are related to their own personal meanings. We analyzed written reflections and end-of-course oral reflection interviews from 42 PSETs on their various service-learning experiences. PSETs discussed themes related to the meanings they made of the service-learning experiences: (a) experiencing science in relation to their lives as humans and future teachers, (b) interacting with elementary students and other PSETs, and (c) making an impact in the physical environment and in the community. The connections that PSETs were making between the discursive spaces (service-learning contexts) and their own meaning-making of these experiences (as connected to their own interests in relation to their future professions and daily lives) shows evidence of the potential that various types of science service-learning experiences have for PSETs in developing inbound science teaching identity trajectories (Wenger in Communities of practice: Learning, meaning, and identity. Cambridge: Cambridge University Press, 1998). The findings of this study point to positive outcomes for PSETs when they participate in structured service-learning experiences along a learning to teaching continuum (246).

Why Do Some Children Bully at School? The Contributions of Negative Attitudes Towards Victims and the Perceived Expectations of Friends, Parents and Teachers

ERIC Educational Resources Information Center

Rigby, Ken

2005-01-01

The tendency for school children to bully others was conceived as lying along a continuum of frequency, ranging from zero to very high. To examine social factors that may influence the position of individual students on this continuum, questionnaires were administered to Australian school children attending state coeducational schools: primary (N…

Pre-Service Teachers' Technological Pedagogical Knowledge: A Continuum of Views on Effective Technology Integration

ERIC Educational Resources Information Center

Lee, Kathryn S.; Smith, Shaunna; Bos, Beth

2014-01-01

This article reports a heuristic case study that explored how components of Technological Pedagogical Knowledge (TPK) manifested in the artifacts of post-Baccalaureate pre-service teachers. Self-reported perceptions of their technology integration competencies were high. End-of-semester presentations reflected three distinct views of technology…

Questioning Questions: Elementary Teachers' Adaptations of Investigation Questions across the Inquiry Continuum

ERIC Educational Resources Information Center

Biggers, Mandy

2018-01-01

Questioning is a central practice in science classrooms. However, not every question translates into a "good" science investigation. Questions that drive science investigations can be provided by many sources including the teacher, the curriculum, or the student. The variations in the source of investigation questions were explored in…

Performance-Based Compensation: Linking Performance to Teacher Salaries. Ask the Team

ERIC Educational Resources Information Center

Behrstock-Sherratt, Ellen; Potemski, Amy

2013-01-01

To achieve the goal of attracting and retaining talented professionals in education, performance-based compensation systems (PBCS) must offer salaries that are both fair and sufficiently competitive at each point across an educator's career continuum. Although many states, especially with the support of the Teacher Incentive Fund (TIF) grants,…

"Figuring" Bidirectional Home and School Connections along the Biliteracy Continuum

ERIC Educational Resources Information Center

Fránquiz, María E.; Leija, María G.; Garza, Irene

2015-01-01

This article centers on the significant practices identified by bilingual teachers who participated in Proyecto Bilingüe, a specialized master's degree program. The notion of bidirectional theory of bilingual pedagogy and the theoretical construct of the continua of biliteracy are utilized to illustrate how the teachers centered home and school…

Citizenship Education in Context: Student Teacher Perceptions of Citizenship in Cyprus

ERIC Educational Resources Information Center

Koutselini, Mary

2008-01-01

This paper presents a phenomenographic study that was carried out at the University of Cyprus Department of Education, aiming at the investigation of student teacher perceptions of citizenship, nationality, community and their relationship with human rights. The study showed a continuum of perceptions about citizenship, which are discussed in line…

Pedagogical Recycling: How Colleagues Change Colleagues' Minds

ERIC Educational Resources Information Center

O'Donnell-Allen, Cindy

2005-01-01

A teacher-researcher uses the metaphor of recycling along a continuum to describe how teachers adapt the ideas of their colleagues with varying degrees of change based on their different contexts. The objective of recycling is not only to reduce waste but also to extend use and the key to lasting changes in mind is sustained participation in…

Authentically Assessing an Assembly Line.

ERIC Educational Resources Information Center

Kirkwood, James J.; Kendrick, Martha L.

1999-01-01

Authentic assessment in elementary school technology education is linked to a continuum of teacher behavior: nondirective, mediating, directive, and concurrent with teaching. It should be a two-way process between the students and the activity. (JOW)

Las Matematicas: Lenguaje Universal. Grados Intermedios, Niveles 1-3. Teacher's Guide I (Mathematics: A Universal Language. Intermediate Grades, Level 1-3. Teacher's Guide I).

ERIC Educational Resources Information Center

Dissemination and Assessment Center for Bilingual Education, Austin, TX.

This guide covers the first part of a bilingual, sequential mathematics course. The course integrates culturally relevant situations and illustrations with mathematics to reinforce the student's self-concept and encourage cultural pride. This program may be used as a self-contained continuum, as a supplement to another course of study, for…

Las Matematicas: Lenguaje Universal. Grados Intermedios, Niveles 4-6. Teacher's Guide II (Mathematics: A Universal Language. Intermediate Grades, Levels 4-6. Teacher's Guide II).

ERIC Educational Resources Information Center

Dissemination and Assessment Center for Bilingual Education, Austin, TX.

This guide covers the second part of a bilingual, sequential mathematics course. The course integrates culturally relevant situations and illustrations with mathematics to reinforce the student's self-concept and encourage cultural pride. This program may be used as a self-contained continuum, as a supplement to another course of study, for…

Bench to Bedside: The Effectiveness of a Professional Development Program Focused on Biomedical Sciences and Action Research

PubMed Central

Barnes, Marianne B.; Barnes, Lehman W.; Cooper, Lou Ann; Bokor, Julie R.; Koroly, Mary Jo

2017-01-01

A three-year, National Institutes of Health-funded residential project at a southeastern research university immersed 83 secondary science teachers in a summer institute called “Bench to Bedside.” Teachers were provided with knowledge, skills, experiences, and incentives to improve their science teaching and increase their awareness of scientific processes, technologies, and careers by examining the translational medicine continuum of basic to clinical research. This was done with the help of medical school researchers, clinical personnel, biotechnology entrepreneurs, program mentors, and prior year participants. A critical component of the institute was the preparation and implementation of an action research project that reflected teachers’ newly acquired knowledge and skills. Action research proposals were critiqued by project team members and feedback provided prior to action research implementation in schools during the following year. Teachers shared their action research with colleagues and project team at a symposium and online as a critical step in networking the teachers. Results of a mixed methods program evaluation strategy indicate that the program produced significant gains in teachers’ confidence to explain advanced biosciences topics, development of action research skills, and formation of a statewide biosciences network of key stakeholders. Constraints of time, variation in teacher content and action research background, technology availability, and school-related variables, among others, are discussed. PMID:29733086

An Authentic Research Experience in an Astronomy Education Professional Development Program: An Analysis of 8 Years of Data on the NASA/IPAC Teacher Archive Research Program (NITARP)

NASA Astrophysics Data System (ADS)

Rebull, Luisa; Roberts, Tracy; Laurence, Wendi; Fitzgerald, Michael; French, Debbie; Gorjian, Varoujan; Squires, Gordon

2018-01-01

The NASA/IPAC Teacher Archive Research Program (NITARP) partners small groups of educators with a research astronomer for a year-long authentic research project. This program aligns well with the characteristics of high-quality professional development (PD) programs and has worked with a total of 103 educators since 2005. In this poster, we explore surveys obtained from 74 different educators, at up to four waypoints during the course of 13 months, incorporating data from the class of 2010 through the class of 2017. The reasons educators participate are mapped onto a continuum ranging from more inward-focused to more outward-focused; NITARP has had more outward-focused educators than inward-focused, though there is a bias against the extremes on either end of the continuum. This insight into teacher motivations has implications for how the educators are supported during the NITARP year. Three-quarters of the educators self-report some or major changes in their understanding of the nature of science. The program provides educators with experience collaborating with astronomers and other educators, and forges a strong link to the astronomical research community; the NITARP community of practice encourages and reinforces these linkages. During the experience, educators get comfortable with learning complex new concepts, with ~40% noting in their surveys that their approach to learning has changed. Educators are provided opportunities for professional growth; at least 12% have changed career paths substantially in part due to the program, and 11% report that the experience was “life changing.” At least 60% are including richer, more authentic science activities in their classrooms. This work illuminates what benefits the program brings to its participants, and serves as a model for similar PD programs in other STEM subjects.

The Engineering Design Process: Conceptions Along the Learning-to-Teach Continuum

NASA Astrophysics Data System (ADS)

Iveland, Ashley

In this study, I sought to identify differences in the views and understandings of engineering design among individuals along the learning-to-teach continuum. To do so, I conducted a comprehensive review of literature to determine the various aspects of engineering design described in the fields of professional engineering and engineering education. Additionally, I reviewed literature on the methods used in teaching engineering design at the secondary (grade 7-12) level - to describe the various models used in classrooms, even before the implementation of the Next Generation Science Standards (NGSS Lead States, 2013). Last, I defined four groups along the learning-to-teach continuum: prospective, preservice, and practicing teachers, as well as teacher educators. The context of this study centered around a California public university, including an internship program where undergraduates engaged with practicing mentor teachers in science and engineering teaching at local high schools, and a teacher education program where secondary science preservice teachers and the teacher educators who taught them participated. Interviews were conducted with all participants to gain insights into their views and understandings of engineering design. Prospective and preservice teachers were interviewed multiple times throughout the year and completed concept maps of the engineering design process multiple times as well; practicing teachers and teacher educators were interviewed once. Three levels of analyses were conducted. I identified 30 aspects of engineering discussed by participants. Through phenomenographic methods, I also constructed six conceptual categories for engineering design to organize those aspects most commonly discussed. These categories were combined to demonstrate a participant's view of engineering design (e.g., business focused, human centered, creative, etc.) as well as their complexity of understanding of engineering design overall (the more categories their ideas fit within, the more complex their understanding was thought to be). I found that the most commonly referenced aspects of engineering design were in line with the three main dimensions described in the Next Generation Science Standards (NGSS Lead States, 2013). I also found that the practicing teacher participants overall conveyed the most complex and integrated understandings of engineering design, with the undergraduate, prospective teachers not far behind. One of the most important factors related to a more integrated understanding of engineering design was having formal engineering experience, especially in the form of conducting engineering research or having been a professional engineer. Further, I found that female participants were more likely than their male counterparts to view engineering as having a human element--recognizing the need to collaborate with others throughout the process and the need to think about the potential user of the product the engineer is solving the problem for. These findings suggest that prior experience with engineering, and not experience in the classroom or with engineering education, tends to lead to a deeper, more authentic view of engineering. Finally, I close with a discussion of the overall findings, limitations of the study, potential implications, and future work.

GLOBE Mission Earth: The evaluation of the first year's implementation.

NASA Astrophysics Data System (ADS)

Adaktylou, N. E.; Hedley, M. L.; Darche, S.; Harris-Stefanakis, E.; Silberglitt, M. D.; Struble, J.; Bingham, P.; Czajkowski, K.

2017-12-01

Here we present the evaluation findings for the first year of implementation of the `Mission Earth' Program.`Mission Earth' proposes the systematic embedding of GLOBE (Global Learning and Observations to Benefit the Environment) resources and NASA assets into the curricula of schools along the K-12 continuum, leveraging existing partnerships and networks. The main goal of the program is to create developmentally appropriate, vertically-integrated K-12 materials and activities,, supported by high quality professional development and ongoing support, engaging teachers from all grades. Its team consists of 5 geographically distributed universities and research institutions that have developed a curriculum progression following research-based best practices, have conducted the year's trainings for selected cohorts of teachers. The evaluation is a continuous process over the program's five year duration to examine implementation and opportunities for improvement. A broad set of data collection tools include a diagnostic component (needs assessment for teachers, capacity assessment for the school environment) and an assessment of implementation component (surveys for teachers and trainers, pre- and post tests for students, classroom observations, teacher interviews, portfolios). The tools used are validated instruments or ones modified to serve the program needs. The patterns emerging from the data provided information on: i) the quality of the intervention as to its design and content, ii) the alignment with the needs of the participants, iii) the implementation phase, iii) changes in the content knowledge of the students and their attitudes toward science, iv) changes in the facility of teachers to teach science in their classrooms after the professional development and materials provided, v) challenges and facilitators of implementation. Based on findings the program evaluation identifies additions/adjustments to be adopted in the following year.

Doctor coach: a deliberate practice approach to teaching and learning clinical skills.

PubMed

Gifford, Kimberly A; Fall, Leslie H

2014-02-01

The rapidly evolving medical education landscape requires restructuring the approach to teaching and learning across the continuum of medical education. The deliberate practice strategies used to coach learners in disciplines beyond medicine can also be used to train medical learners. However, these deliberate practice strategies are not explicitly taught in most medical schools or residencies. The authors designed the Doctor Coach framework and competencies in 2007-2008 to serve as the foundation for new faculty development and resident-as-teacher programs. In addition to teaching deliberate practice strategies, the programs model a deliberate practice approach that promotes the continuous integration of newly developed coaching competencies by participants into their daily teaching practice. Early evaluation demonstrated the feasibility and efficacy of implementing the Doctor Coach framework across the continuum of medical education. Additionally, the Doctor Coach framework has been disseminated through national workshops, which have resulted in additional institutions applying the framework and competencies to develop their own coaching programs. Design of a multisource evaluation tool based on the coaching competencies will enable more rigorous study of the Doctor Coach framework and training programs and provide a richer feedback mechanism for participants. The framework will also facilitate the faculty development needed to implement the milestones and entrustable professional activities in medical education.

Personal Epistemology of Urban Elementary School Teachers

ERIC Educational Resources Information Center

Pearrow, Melissa; Sanchez, William

2008-01-01

Personal epistemology, originating from social construction theory, provides a framework for researchers to understand how individuals view their world. The Attitudes About Reality (AAR) scale is one survey method that qualitatively assesses personal epistemology along the logical positivist and social constructionist continuum; however, the…

Weaving Arctic Networks of Support and Engaged Accountability

NASA Astrophysics Data System (ADS)

Warnick, W. K.

2003-12-01

This presentation will provide a preview of a new project which explores the potential of applying emerging educational research in conjunction with the latest polar research through a multifaceted approach designed to weave networks of support and engaged accountability between Arctic researchers, teachers, and learners. This presentation will outline how Sunwood's (2002) WoSEA educational model might be utilized to facilitate and study methods of engaging and supporting teachers and scientists in collaborative Arctic research and pedagogy. The model we are proposing employs action research methodology to provide educators and scientists the opportunity to engage in reflection on their own practice, and enhancement of their own practice through extensive connection and collaboration between education and scientific professionals, thus contributing to the cumulative development of a lifelong learning continuum. Our Weaving the Arctic project will amplify and enhance the voice, knowledge and expertise of Arctic researchers and teachers as each participant explores, shares, and showcases their experience, knowledge, and the products of their practice. Weaving thus holds great promise for addressing science education needs, particularly the critical needs surrounding enhancement and retention of STEM teachers in K-12 (especially rural) schools. This presentation will share the promise of our Weaving model.

Extended professional development for systemic curriculum reform

NASA Astrophysics Data System (ADS)

Kubitskey, Mary Elizabeth

Education standards call for adopting inquiry science instruction. Successful adoption requires professional development (PD) to support teachers, increasing the need for research on PD. This dissertation examines the question: What is the influence of high quality, curriculum aligned, long-term group workshops and related practice on teacher learning? I focus on the following subquestions: (1) What is the influence of high quality, curriculum aligned, long-term, group workshops on teacher knowledge and beliefs? (2) What is the impact of the workshops on teacher practice? (3) What is the influence of practice on student response? (4) What is the impact of practice and student response on teacher knowledge and beliefs? I focus on an instance of PD nested within a long-term systemic change initiative, tracing eleven science teachers' learning from workshops and associated enactments. The data included pre and post-unit interviews (n=22), two post-workshop interviews (n=17), workshop observations (n=2), classroom observations (n=24) and student work (n=351). I used mixed-methods analysis. Quantitative analysis measured teacher learning by comparing pre and post-unit interview ratings. Qualitative components included two case study approaches: logic model technique and cross-case synthesis, examining teacher learning within and across teachers. The findings suggested a teacher-learning model incorporating PD, teacher knowledge, beliefs, practice and student response. PD impacts teachers' knowledge by providing teachers with new knowledge, adapting previous knowledge, or convincing them to value existing knowledge they chose not to use. The workshops can influence beliefs, providing teachers with confidence and motivation to adopt the practice. Beliefs can mediate how knowledge manifested itself in practice that, in turn, impacts students' response. Student response influences the teachers' beliefs, either reinforcing or motivating change. This teacher-learning model suggests a PD design model for long-term systemic change, incorporating teacher practice and student response, providing guidance for teachers making adaptations that maintain reform. This dissertation responds to the call for empirical research linking PD to learning outcomes. These models are unique because practice becomes a continuum of PD, rather than outcome and stresses the importance of addressing teachers' beliefs. This PD design provides mechanisms for maintaining equivalence between the written and enacted curriculum, sustaining the integrity of the reform.

Adapting to Teach Climate Literacy

NASA Astrophysics Data System (ADS)

Wilkening, B.; Schwartz, K. L.

2017-12-01

Adaptation is a key strategy to deal with the effects of climate change, and it can also be a key strategy in teaching climate literacy. Adapting curriculum to include utilizing new instructional practices, modifying existing lessons, evaluating evidence and engaging students in real-world projects are strategies employed in Recharge the Rain. Arizona Project WET and Watershed Management Group developed the Recharge the Rain project, through a NOAA Environmental Literacy Grant, to build community resiliency to hazards associated with increased temperatures, drought and flooding in Arizona. Sixth through twelfth grade teachers, students and the public will move through a continuum from awareness, to knowledge gain, to conceptual understanding, to action. During the first year of the project, through professional development and ongoing guidance, teachers developed a climate literacy curriculum to use in their classrooms. Using systems thinking language and structure from the Cabrera Research Labs, teachers and students gain the thinking tools necessary to increase understanding of Earth's climate system. Lessons and resources for teaching about climate change are abundant and many, such as those on the Climate Literacy Education Awareness Network (CLEAN), have gone through an extensive review process. By cataloguing online resources and sharing these with teachers through a social bookmarking tool, wakelet.com, teachers are easily able to find appropriate teaching material. Engaging students in evaluating evidence requires the data to be relevant to their everyday lives. Online data resources are readily available from NOAA and other sources at both the global and local levels. When teachers, students and the public contribute to the data collection process in citizen science projects such as CoCoRaHS, iSeeChange, and USA National Phenology Network, the data empowers them to act in ways to mitigate the climate threats in their community. Adapting to teach climate literacy can create a community of teachers, students and the public who are moving forward with making responsible decisions that affect the climate.

An exploration of the science teaching orientations of Indian science teachers in the context of curriculum reform

NASA Astrophysics Data System (ADS)

Nargund-Joshi, Vanashri

This study explores the concepts and behaviors, otherwise referred to as orientations, of six Indian science teachers and the alignment of these orientations to the 2005 India National Curriculum Framework (NCF-2005). Differences in teachers' orientations across grade bands (elementary, middle, and secondary) and school types (public versus private) are also examined to determine how contextual factors may influence this alignment. First, a content analysis of the NCF-2005 was completed to identify the overarching principles of the NCF-2005 and goals specific to the teaching and learning of science. Interviews with school principals were also analyzed to understand how the goals of NCF-2005 were communicated to schools and teachers. Together, these data sources served to answer research question one. Next, profiles were created based on three interviews with each teacher and several observations of their teaching. These profiles provide a point of reference for answering the remaining three research questions. Findings include teacher's orientations falling along a continuum from traditionalist in nature to inquiry/constructivist in nature. Stark contrasts were found between traditionalist orientations and the goals of NCF-2005, with much of this contrast due to the limited pedagogical content knowledge these teachers have regarding students' scientific thinking, curriculum design, instructional strategies, and assessment. Inquiry/constructivist teachers' orientations, while more in line with reform, still have a few key areas of pedagogical content knowledge needing attention (e.g., knowledge of assessment and a variety of purposes for constructivist instructional strategies). In response to the final research question, several contextual factors contributed to teachers' orientations including environmental constraints, such as limited resources and large class sizes, cultural testing pressures, and limited accessibility to professional development. Suggestions for improving the implementation of NCF-2005 in India's classrooms are discussed according to various stakeholders (e.g., policy makers, curriculum designers, professional developers).

Langley Research Center Strategic Plan for Education

NASA Technical Reports Server (NTRS)

Proctor, Sandra B.

1994-01-01

Research assignment centered on the preparation of final draft of the NASA Langley Strategic Plan for Education. Primary research activity consisted of data collection, through interviews with LaRC Office of Education and NASA Headquarters staff, university administrators and faculty, and school administrators / teachers; and documentary analysis. Pre-college and university programs were critically reviewed to assure effectiveness, support of NASA and Langley's mission and goals; National Education Goals; and educational reform strategies. In addition to these mandates, pre-college programs were reviewed to address present and future LaRC activities for teacher enhancement and preparation. University programs were reviewed with emphasis on student support and recruitment; faculty development and enhancement; and LaRC's role in promoting the utilization of educational technologies and distance learning. The LaRC Strategic Plan for Education will enable the Office of Education to provide a focused and well planned continuum of education programs for students, teachers and faculty. It will serve to direct and focus present activities and programs while simultaneously offering the flexibility to address new and emerging directions based on changing national, state, and agency trends.

Maintaining the Median in Early Childhood Educational Methodology

ERIC Educational Resources Information Center

Hewes, Dorothy W.

2005-01-01

History shows that educational systems and educational theorists have consciously or unconsciously structured the education of young children toward one end or the other of the continuum between "internals" and "externals". Systems in which teacher-guided learning was based on efforts to satisfy individual needs, systems that…

The Novice-Expert Continuum in Astronomy Knowledge

NASA Astrophysics Data System (ADS)

Bryce, T. G. K.; Blown, E. J.

2012-03-01

The nature of expertise in astronomy was investigated across a broad spectrum of ages and experience in China and New Zealand. Five hypotheses (capable of quantification and statistical analysis) were used to probe types of expertise identified by previous researchers: (a) domain-specific knowledge-skill in the use of scientific vocabulary and language and recognising relationships between concepts in linguistic and schematic forms; (b) higher-order theory in terms of conceptual structure and enriched scientific knowledge and reasoning; with an expectation of cultural similarity. There were 993 participants in all, age 3-80 years, including 68 junior school pupils; 68 pre-school pupils; 112 middle-school students; 109 high-school students; 79 physics undergraduates; 60 parents; 136 pre-service primary teachers; 131 pre-service secondary teachers; 72 primary teachers; 78 secondary teachers; 50 amateur astronomers and astronomy educators; and 30 astronomers and physicists; with approximately equal numbers of each group in both cultures; and of boys and girls in the case of children. For them, the methodology utilised Piagetian interviews with three media (verbal language, drawing, play-dough modelling), and for adults a questionnaire inviting responses in writing and drawing was used. The data from each group were categorised into ordinal scales and then analysed by means of Kolmogorov-Smirnov two-sample tests. The findings supported the hypotheses with evidence of all forms of expertise increasing with experience in both cultures (α level 0.05). The relative gains, overlaps and deficits in expertise across the novice-expert continuum are explored in detail.

The Transformative Potential of the Scholarship of Teaching

ERIC Educational Resources Information Center

Kreber, Carolin

2013-01-01

In discussing personal stances professionals might take towards their practice, Hoyle contrasts two orientations that can be placed at the ends of a continuum. The first pole, the so-called "restricted" stance, is characterised by teachers relying principally on experience and intuition, and focusing on daily classroom practicalities.…

Academics' Conceptions of Assessment and Their Assessment Practices

ERIC Educational Resources Information Center

Postareff, Liisa; Virtanen, Viivi; Katajavuori, Nina; Lindblom-Ylanne, Sari

2012-01-01

The present study focuses; firstly, on analysing academics' conceptions of the purpose of assessment; secondly, on their assessment practices; and thirdly, on the relationship between their conceptions and practices. The data consisted of interviews with 28 pharmacy teachers. The analysis resulted in a continuum of categories of conceptions, from…

The Benefits of Using Authentic Inquiry within Biotechnology Education

ERIC Educational Resources Information Center

Hanegan, Nikki; Bigler, Amber

2010-01-01

A broad continuum exists to describe the structure of inquiry lessons (Hanegan, Friden, & Nelson, 2009). Most teachers have heard inquiry described from a range of simple questioning to completely student-designed scientific studies (Chinn & Malhotra, 2002). Biotechnology education often uses a variety of inquiries from cookbook laboratory…

A Continuum of Teachers' e-Learning Practices

ERIC Educational Resources Information Center

Sadeck, Osman; Cronjé, Johannes

2017-01-01

The introduction of technologies into the teaching and learning environment has implied changes to the way education plays out in an e-Environment. Previous research has highlighted the many barriers and challenges in integration technology into teaching and learning. Technology is said to be underutilised. However there are studies that have…

A faculty development workshop in narrative-based reflective writing.

PubMed

Boudreau, J Donald; Liben, Stephen; Fuks, Abraham

2012-08-01

Narrative approaches are used increasingly in the health professions with a range of objectives. We must acquaint educators with this burgeoning field and prepare them for the incorporation of story-telling in their pedagogical practices. The authors describe a template for a faculty development workshop designed to foster self-reflection through the use of narrative techniques and prepare clinical teachers to deploy such approaches. The design is based on a six-year experience in delivering introductory workshops in narrative approaches to medical teachers. The workshops, which served as a model for the template, have been offered to a total of 92 clinicians being trained to mentor medical students. A generic template is described. It includes a table of core concepts from narrative theory, a set of probing questions useful in a basic technical analysis of texts and a list of initiating prompts for exercises in reflective writing. A workshop organized and deployed using this template is deliverable over a half-day. The model has proven to be feasible and highly valued by participants. It can be adapted for other contexts by educators across the continuum of health professional education.

Influence of teacher-directed scientific inquiry on students' primal inquiries in two science classrooms

NASA Astrophysics Data System (ADS)

Stone, Brian Andrew

Scientific inquiry is widely used but pervasively misunderstood in elementary classrooms. The use of inquiry is often attached to direct instruction models of teaching, or is even passed as textbook readings or worksheets. Previous literature on scientific inquiry suggests a range or continuum beginning with teacher-directed inquiry on one extreme, which involves a question, process, and outcome that are predetermined by the teacher. On the other end of the continuum is an element of inquiry that is extremely personal and derived from innate curiosity without external constraints. This authentic inquiry is defined by the study as primal inquiry. If inquiry instruction is used in the elementary classroom, it is often manifested as teacher-directed inquiry, but previous research suggests the most interesting, motivating, and lasting content is owned by the individual and exists within the individual's own curiosity, questioning and processes. Therefore, the study examined the impact of teacher-directed inquiry in two elementary fourth grade classrooms on climate-related factors including interest, motivation, engagement, and student-generated inquiry involvement. The study took place at two elementary classrooms in Arizona. Both were observed for ten weeks during science instruction over the course of one semester. Field notes were written with regard for the inquiry process and ownership, along with climate indicators. Student journals were examined for evidence of primal inquiry, and twenty-two students were interviewed between the two classrooms for evidence of low climate-related factors and low inquiry involvement. Data from the three sources were triangulated. The results of this qualitative study include evidence for three propositions, which were derived from previous literature. Strong evidence was provided in support of all three propositions, which suggest an overall negative impact on climate-related factors of interest, motivation, and engagement for students working within a teacher-directed scientific inquiry environment. Very little existed in terms of time, materials, or opportunities for students to explore science using their own questions and processes. Furthermore, as students conformed to a teacher-directed inquiry environment, their own primal inquiries were displaced and undervalued. Ownership belonged to the teacher and precluded primal inquiries in both classrooms.

Gender-related beliefs of Turkish female science teachers and their effect on interactions with female and male students

NASA Astrophysics Data System (ADS)

Uysal, Sibel

The purpose of this study is to examine the relationship between Turkish female science teachers' gender-related beliefs and those teachers' corresponding interaction with their male and female students. The data was collected from five different sources: Surveys, interviews, observations, chi square data from the observation phase, and interviews with selected teachers. The data was analyzed using the Ericson interpretive method of socio-cultural theories which provided a framework for understanding the development of teacher beliefs and their interactions with their students. In this study, the survey revealed three types of teachers ranging from traditional, moderate to modern. Moderate teachers exhibited characteristics that were on a continuum between the traditional and modern teachers. Traditional teachers believed that males and females should have certain defined roles. Females should be responsible for taking care of the needs of their children and their husbands. By comparison, modern teachers did not assign specific roles to either males or females. With regard to the role of women in science, traditional teachers believed that female scientists could not be as successful as male scientists. By comparison, modern teachers believed that female scientists could be as successful as male scientists. Modern teachers did indicate that they thought females needed to work harder than males to prove themselves. When it came to the teachers' views and beliefs regarding their female and male students' success in their science classrooms, traditional teachers believed that their male students were brighter than their female students. They also believed that female students excelled only because they worked harder. Modern teachers believed that success is dependent on each student's background and his or her interest in science. Classroom observation indicated that traditional and modern teachers interacted differently with their male and female students. Traditional teachers provided more speaking time to male students and permitted male students to ask more questions than their female students. Modern teachers, on the other hand, paid equal attention to all their students. Both groups' belief systems were apparent and impacted their interactions with their students.

77 FR 45367 - Continuum of Care Homeless Assistance Grant Application; Continuum of Care Application

Federal Register 2010, 2011, 2012, 2013, 2014

2012-07-31

... DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT [Docket No. FR-5603-N-53] Continuum of Care Homeless Assistance Grant Application; Continuum of Care Application AGENCY: Office of the Chief Information Officer..., called Continuums of Care (CoC), will complete the Exhibit 1 of the Continuum of Care Homeless Assistance...

Reform-based science teaching: A mixed-methods approach to explaining variation in secondary science teacher practice

NASA Astrophysics Data System (ADS)

Jetty, Lauren E.

The purpose of this two-phase, sequential explanatory mixed-methods study was to understand and explain the variation seen in secondary science teachers' enactment of reform-based instructional practices. Utilizing teacher socialization theory, this mixed-methods analysis was conducted to determine the relative influence of secondary science teachers' characteristics, backgrounds and experiences across their teacher development to explain the range of teaching practices exhibited by graduates from three reform-oriented teacher preparation programs. Data for this study were obtained from the Investigating the Meaningfulness of Preservice Programs Across the Continuum of Teaching (IMPPACT) Project, a multi-university, longitudinal study funded by NSF. In the first quantitative phase of the study, data for the sample (N=120) were collected from three surveys from the IMPPACT Project database. Hierarchical multiple regression analysis was used to examine the separate as well as the combined influence of factors such as teachers' personal and professional background characteristics, beliefs about reform-based science teaching, feelings of preparedness to teach science, school context, school culture and climate of professional learning, and influences of the policy environment on the teachers' use of reform-based instructional practices. Findings indicate three blocks of variables, professional background, beliefs/efficacy, and local school context added significant contribution to explaining nearly 38% of the variation in secondary science teachers' use of reform-based instructional practices. The five variables that significantly contributed to explaining variation in teachers' use of reform-based instructional practices in the full model were, university of teacher preparation, sense of preparation for teaching science, the quality of professional development, science content focused professional, and the perceived level of professional autonomy. Using the results from phase one, the second qualitative phase selected six case study teachers based on their levels of reform-based teaching practices to highlight teachers across the range of practices from low, average, to high levels of implementation. Using multiple interview sources, phase two helped to further explain the variation in levels of reform-based practices. Themes related to teachers' backgrounds, local contexts, and state policy environments were developed as they related to teachers' socialization experiences across these contexts. The results of the qualitative analysis identified the following factors differentiating teachers who enacted reform-based instructional practices from those who did not: 1) extensive science research experiences prior to their preservice teacher preparation; 2) the structure and quality of their field placements; 3) developing and valuing a research-based understanding of teaching and learning as a result of their preservice teacher preparation experiences; 4) the professional culture of their school context where there was support for a high degree of professional autonomy and receiving support from "educational companions" with a specific focus on teacher pedagogy to support student learning; and 5) a greater sense of agency to navigate their districts' interpretation and implementation of state polices. Implications for key stakeholders as well as directions for future research are discussed.

The Many Faces of Constructivist Discussion

ERIC Educational Resources Information Center

Golding, Clinton

2011-01-01

Although constructivist discussions in the classroom are often treated as if they were all of the same kind, in this paper I argue that there are subtle but important distinctions that need to be made. An analysis of these distinctions shows that there is a continuum of different constructivist discussions. At one extreme are teacher-directed…

Insider-Outsider Perspective: Revisiting the Conceptual Framework of Research Methodology in Language Teacher Education

ERIC Educational Resources Information Center

Nakata, Yoshiyuki

2015-01-01

The present paper discusses three types of research perspective on the insider-outsider continuum: outsider research, (insider's) outsider research, and insider research. It examines the essential features of the insider-outsider distinction with reference to categories such as researcher, students, classroom context, contribution, control of…

A Proactive and Responsive Bio-Psychosocial Approach to Managing Challenging Behaviour in Mainstream Primary Classrooms

ERIC Educational Resources Information Center

Madden, Lorraine O. B.; Senior, Joyce

2018-01-01

Research in the area of social, emotional and behavioural difficulties, and teacher's struggle to respond to challenging behaviour in mainstream classrooms, has consistently highlighted the need for proventative and responsive approaches within a continuum of support. This study aims to, firstly, investigate what proactive and reactive strategies…

Group, Team, or Something in Between? Conceptualising and Measuring Team Entitativity

ERIC Educational Resources Information Center

Vangrieken, Katrien; Boon, Anne; Dochy, Filip; Kyndt, Eva

2017-01-01

The current gap between traditional team research and research focusing on non-strict teams or groups such as teacher teams hampers boundary-crossing investigations of and theorising on teamwork and collaboration. The main aim of this study includes bridging this gap by proposing a continuum-based team concept, describing the distinction between…

Understanding Student Behavioral Engagement: Importance of Student Interaction with Peers and Teachers

ERIC Educational Resources Information Center

Nguyen, Tuan Dinh; Cannata, Marisa; Miller, Jason

2018-01-01

Recent theoretical conceptualizations of student engagement have raised questions about how to measure student engagement and how engagement varies not only across schools, but also within school and within classrooms. The authors build on existing research on student behavioral engagement and extend this research to emphasize a continuum of…

Between a rock and a hard place: Learning to teach science-for-all in an urban district

NASA Astrophysics Data System (ADS)

Galosy, Jodie A.

2005-07-01

Science-for-all, a contemporary science education reform initiative, envisions science classrooms where all students have opportunities to deepen their understanding of scientific concepts and practices. However, national science achievement tests indicate the reality of science-for-all is still very much a work-in-progress. Science-for-all demands much of teachers, especially those working with student populations typically underserved by science education---students of color, students with limited English proficiency, and those from families with limited economic means. A large proportion of those students attend urban districts where they are likely to encounter novice science teachers. This qualitative study investigated learning to teach science-for-all in an urban school district. Seven early career middle and high school science teachers participated in the study. Data collection took place over a period of fourteen months, through interviews and observations with teacher participants, their schools, and in their professional development activities (including new teacher support induction programs). The study examines how new teachers' use of their personal, social, and conventional resources influenced their beliefs and practices relative to science-for-all. Three reform ideals serve as the study's focal points: content goals that emphasize understanding scientific concepts and practices, hands-on activities that support students' intellectual engagement, and literacy strategies that provide access for all students to scientific content. Few novices developed beliefs and practices that supported science-for-all. Those who did brought several key personal resources to their teaching. While these personal resources were important for teacher development, they were not sufficient; novices needed additional resources. Some teachers had access to reform-based conventional resources others did not have. However, personal and social resources shaped how novices used those resources and, in turn, their beliefs about students and teaching practices. Context-specific assistance was a particularly important social resource that was in short supply for most novices. The study provides evidence that progress towards science-for-all will require substantial attention to, and investment in, teacher learning across all dimensions of the professional continuum---pre-service, induction, and in-service. The study also provides insights in two critical areas: strengthening the resources available to early career urban science teachers and shaping resource use towards the goals envisioned in science-for all.

Frontline learning of medical teaching: "you pick up as you go through work and practice".

PubMed

Hartford, W; Nimmon, L; Stenfors, T

2017-09-19

Few medical teachers have received formal teaching education. Along with individual and organizational barriers to participation in teacher training programs, increasing numbers and altered distribution of physicians away from major teaching centers have increased the difficulty of attendance. Furthermore, it is not known if traditional faculty development formats are the optimal learning options given findings from existing studies document both positive and negative outcomes. There is a gap in research that explores how medical teachers learn to teach and also limited research regarding how medical teachers actually teach. The purpose of this study was to provide insight into how physicians describe their teaching of trainees, and the nature of their teaching development and improvement to inform faculty development programs. Semi-structured interviews were conducted with 36 physicians, with a broad range of teaching experience, purposefully selected from five disciplines: Internal Medicine, Pediatrics, Psychiatry, Surgery, and Family Medicine. A qualitative, inductive approach was used to analyse the data. Teaching was described as being centered on the needs of individual trainees, but was dependent on patient presentation and environmental context. For this group of physicians learning to teach was perceived as a dynamic and evolving process influenced by multiple life experiences. The physicians had not learnt to teach through formal education and then put that learning into practice, but had learnt to teach and improve their teaching through their trial and errors teaching. Life experiences unconnected with the medical environment contributed to their knowledge of teaching along with limited formal learning to teach experiences. Teaching practice was influenced by peers and trainees, feedback, and observation. The findings suggest these medical teachers learn to teach along a continuum largely through their teaching practice. The findings suggested that the participants' major resource for learning how to teach was informal experiential learning, both in and out of the workplace. This may have implications for faculty development strategies for medical teaching education.

Passing waves from atomistic to continuum

NASA Astrophysics Data System (ADS)

Chen, Xiang; Diaz, Adrian; Xiong, Liming; McDowell, David L.; Chen, Youping

2018-02-01

Progress in the development of coupled atomistic-continuum methods for simulations of critical dynamic material behavior has been hampered by a spurious wave reflection problem at the atomistic-continuum interface. This problem is mainly caused by the difference in material descriptions between the atomistic and continuum models, which results in a mismatch in phonon dispersion relations. In this work, we introduce a new method based on atomistic dynamics of lattice coupled with a concurrent atomistic-continuum method to enable a full phonon representation in the continuum description. This permits the passage of short-wavelength, high-frequency phonon waves from the atomistic to continuum regions. The benchmark examples presented in this work demonstrate that the new scheme enables the passage of all allowable phonons through the atomistic-continuum interface; it also preserves the wave coherency and energy conservation after phonons transport across multiple atomistic-continuum interfaces. This work is the first step towards developing a concurrent atomistic-continuum simulation tool for non-equilibrium phonon-mediated thermal transport in materials with microstructural complexity.

77 FR 33229 - Notice of Proposed Information Collection for Public Comment; Continuum of Care Homeless...

Federal Register 2010, 2011, 2012, 2013, 2014

2012-06-05

... Information Collection for Public Comment; Continuum of Care Homeless Assistance Grant Application--Continuum of Care Application AGENCY: Office of Assistant Secretary for Community Planning and Development... collection for public comment entitled Continuum of Care of Homeless Assistance Grant Application- Continuum...

SEAS (Student Experiments At Sea): Helping Teachers Foster Authentic Student Inquiry in the Science Classroom

NASA Astrophysics Data System (ADS)

Goehring, L.; Kelsey, K.; Carlson, J.

2005-12-01

Teacher professional development designed to promote authentic research in the classroom is ultimately aimed at improving student scientific literacy. In addition to providing teachers with opportunities to improve their understanding of science through research experiences, we need to help facilitate similar learning in students. This is the focus of the SEAS (Student Experiments At Sea) program: to help students learn science by doing science. SEAS offers teachers tools and a framework to help foster authentic student inquiry in the classroom. SEAS uses the excitement of deep-sea research, as well as the research facilities and human resources that comprise the deep-sea scientific community, to engage student learners. Through SEAS, students have the opportunity to practice inquiry skills and participate in research projects along side scientists. SEAS is a pilot program funded by NSF and sponsored by the Ridge 2000 research community. The pilot includes inquiry-based curricular materials, facilitated interaction with scientists, opportunities to engage students in research projects, and teacher training. SEAS offers a framework of resources designed to help translate inquiry skills and approaches to the classroom environment, recognizing the need to move students along the continuum of scientific inquiry skills. This framework includes hands-on classroom lessons, Classroom to Sea labs where students compare their investigations with at-sea investigations, and a student experiment competition. The program also uses the Web to create a virtual ``scientific community'' including students. Lessons learned from this two year pilot emphasize the importance of helping teachers feel knowledgeable and experienced in the process of scientific inquiry as well as in the subject. Teachers with experience in scientific research were better able to utilize the program. Providing teachers with access to scientists as a resource was also important, particularly given the challenges of working in the deep-sea environment. Also, fostering authentic student investigations (i.e., working through preparatory materials, developing proposals, analyzing data and writing summary reports) is challenging to fit within the academic year. Nonetheless, teacher feedback highlights that the excitement generated by participation in real research is highly motivating. Further, students experience a ``paradigm shift'' in understanding evidence-based reasoning and the process of scientific discovery.

Construction of knowledge about teaching practice and educating students from diverse cultures in an online induction program

NASA Astrophysics Data System (ADS)

Bice, Lawrence Raymond

2005-11-01

Beginning teachers in both urban areas and geographically isolated rural areas often do not have access to a mentor teacher of the same content area or grade level in their school or district. This project is a study of learning in the on-line e-Mentoring for Student Success (eMSS) program, which provides induction for science and mathematics teachers in Montana and California. The study centered on a particular segment of eMSS called the Diversity Module. Two examinations were conducted: (1) Analysis of discourse by all participants in the Diversity Module, and (2) case study of five beginning teachers with diverse student populations. Analysis of learning by cases was conducted by examining discourse in the Diversity Module, private on-line discussions with their assigned mentors during a two-year period, and pre and post Diversity Module interviews and interviews of their mentors. Three frameworks were developed to aid understanding of findings: (1) discourse analysis, (2) competencies of multicultural teachers, and, (3) competencies of pedagogical and pedagogical content knowledge. Cases developed their knowledge of teaching along a continuum of needs over two years of participation in the eMSS program. Initial needs expressed by mentees were in areas such as classroom management and general methods of instruction. Cases increased their knowledge in virtually all aspects of pedagogical knowledge, changing their expressed needs to pedagogical content knowledge concerns such as adapting and differentiating instruction for particular content and individual students, and building their repertoire of instructional representations. Through on-line discussion, teachers developed or advanced awareness of student culture and learning characteristics, and adapted their practice to foster a climate of student respect. Findings provided little evidence of adapting instruction for diverse student learning. Teachers who had a strong awareness of their own and their students' cultures advanced their understanding of multicultural teaching competencies further than those who did not. Interview results indicated that learning sometimes takes place in a non-visible manner. Growth in multicultural teaching knowledge, as well as several aspects of pedagogical and pedagogical content knowledge, was clearly evident for participants who posted few messages, but read and actively reflected on thoughts of others.

The Mathematics of Networks Science: Scale-Free, Power-Law Graphs and Continuum Theoretical Analysis

ERIC Educational Resources Information Center

Padula, Janice

2012-01-01

When hoping to initiate or sustain students' interest in mathematics teachers should always consider relevance, relevance to students' lives and in the middle and later years of instruction in high school and university, accessibility. A topic such as the mathematics behind networks science, more specifically scale-free graphs, is up-to-date,…

Defining Sex and Abstinence: Dialogue Is the Key

ERIC Educational Resources Information Center

Hamill, Shelley D.; Chepko, Stevie

2005-01-01

When does abstinence end and sexual activity begin? In previous generations, the continuum of sexual activity was well-defined in the old baseball analogy. Teens, parents, and teachers knew what going to first, second, or third base involved. For the current generation of young people, sex and abstinence are not so well-defined. As parents and…

"I Am in Grade One and I Can Read!" The Readers' Workshop

ERIC Educational Resources Information Center

Mounla, Ghina; Bahous, Rima; Nabhani, Mona

2011-01-01

This study analyzed the effects of the implementation of the readers' workshop on students' reading levels and comprehension skills in a first-grade, mixed-ability classroom in Lebanon. The instruments used at the beginning were running records and reading continuums, and at the end of the academic year, teachers' professional notebooks and notes…

Recharge the Rain: Community Resilience Through STEM Education

NASA Astrophysics Data System (ADS)

Wilkening, B.; Shipek, C.

2017-12-01

Starting in January 2017, Recharge the Rain moves sixth through twelfth grade teachers, students and the public through a continuum from awareness, to knowledge gain, to conceptual understanding, to action; building community resiliency to hazards associated with increased temperatures, drought and flooding in Arizona. Watershed Management Group with Arizona Project WET are utilizing NOAA assets, experts from the National Weather Service and Climate Assessment for the Southwest (CLIMAS), and Pima County hazard mitigation plan and planning tools to inform citizens and galvanize their commitment to building a community, resilient to the effects of a warming climate. In the first of four years, the project is 1) developing climate-literacy curriculum with 16 Tucson-area teachers that incorporates systems-thinking and increases understanding of earth systems, weather and climate, 2) training teachers and community docents in water harvesting practices and citizen-science data collection, 3) laying the framework for the development of rainwater harvesting engineering design curriculum, 4) involving Tucson community members in water harvesting principles through project implementation workshops, special events, and tours. In years two through four, the project will build resiliency to the effects of climate threats by 1) installing student-designed rainwater harvesting systems, 2) providing community tours of schoolyard systems to educate the public, 3) expanding the program to incorporate curriculum use in Phoenix-area teachers' classrooms and 4) finalizing a replicable model for other communities facing similar threats. What are the lessons learned after one year of Recharge the Rain? How can these lessons be used to inform this project and other projects in building resilient communities?

Educator Exploration of Authentic Environmental Issues of the Coastal Margin Through Information Technology

NASA Astrophysics Data System (ADS)

Herbert, B. E.; Schielack, J. F.

2004-12-01

Teachers immersed in authentic science inquiry in professional development programs, with the goal of transferring the nature of scientific research to the classroom, face two enormous problems: (1) issues surrounding the required knowledgebase, skills set, and habits of mind of the teachers that control, to a large degree, the ability of teachers to immerse themselves in authentic scientific research in the available time, and (2) the difficulties in transferring this experience to the classroom. Most professional development programs utilize one of two design models, the first limits the authenticity of the scientific experience while placing more emphasis on pedagogical issues, and second where teachers are immersed in scientific research, often through mentoring programs with scientists, but with less explicit attention to problems of transfer to the classroom. The ITS Center for Teaching and Learning (its.tamu.edu), a five-year NSF-funded collaborative program that engages scientists, educational researchers, and educators in the use of information technology to improve science teaching and learning at all levels, has developed a model that supports teachers' learning about authentic scientific research, pedagogical training in inquiry-based learning, and educational research in their own classrooms on the impacts of using information technology to promote authentic science experiences for their students. This connection is achieved through scaffolding by information technology that supports the modeling, visualization and exploration of complex data sets to explore authentic scientific questions that can be integrated within the 7-16 curriculum. Our professional development model constitutes a Learning Research Cycle, which is characterized as a seamless continuum of inquiry activities and prolonged engagement in a learning community of educators, scientists, and mathematicians centered on the development of teachers' pedagogical content knowledge as it relates to the use of information technology in doing, learning, and teaching science. This talk will explore the design changes of the geoscience team of the ITS as it moved from Phase I (the planned program designed in-house) to Phase II (the experimental program being tested in-house) over two, two-year cohorts. We have assessed the impact of our Learning Research Cycle model on ITS participants using both a mixed model assessment of learning products, surveys, interviews, and teacher inquiry projects. Assessment results indicate that teachers involved in the second cohort improved their understanding of geoscience and inquiry-based learning, while improving their ability to establish authentic inquiry in their classrooms through the use of information technology and to assess student learning.

Continuum modeling of large lattice structures: Status and projections

NASA Technical Reports Server (NTRS)

Noor, Ahmed K.; Mikulas, Martin M., Jr.

1988-01-01

The status and some recent developments of continuum modeling for large repetitive lattice structures are summarized. Discussion focuses on a number of aspects including definition of an effective substitute continuum; characterization of the continuum model; and the different approaches for generating the properties of the continuum, namely, the constitutive matrix, the matrix of mass densities, and the matrix of thermal coefficients. Also, a simple approach is presented for generating the continuum properties. The approach can be used to generate analytic and/or numerical values of the continuum properties.

Teaching the teachers.

PubMed

Zavalkoff, Anne

2002-10-01

SUMMARY This paper presents a conceptual tool designed to help teacher education students think critically about the roots and consequences of personal, parental, community, and institutional resistance to diverse sexual identities and behaviours. To explore the roots of sexualized and gendered prejudice and ground the conceptual tool theoretically, it begins with a careful examination of Judith Butler's work on performativity. The paper then describes and illustrates the conceptual tool. The Continuum of (Subversive) Drag Performance helps stimulate critical thinking about the power implications of people's sexed and gendered performances through its six ranges: Radical, Stealth, Commercial, Passing, Mainstream, and Privileged. Because these ranges are independent of common considerations of "normalcy," they offer teacher education students a relatively unthreatening framework for analyzing conceptions of sexuality and gender that, left unexamined, can contribute to sexism, heterosexism, and homophobia.

A Situative Analysis of Postsecondary Teaching: Examining the Relationships among Faculty Beliefs about Student Learning, Course Planning, and Classroom Instruction

ERIC Educational Resources Information Center

Hora, Matthew Tadashi

2012-01-01

Research suggests that the pedagogical thoughts of postsecondary teachers exist on a continuum from student-centered to teaching-centered orientations, the latter of which are more pedagogically effective than the former. However, this body of literature has been critiqued for insufficient conceptualization of psychological constructs and the lack…

Patterns of Control over the Teaching-Studying-Learning Process and Classrooms as Complex Dynamic Environments: A Theoretical Framework

ERIC Educational Resources Information Center

Harjunen, Elina

2012-01-01

In this theoretical paper the role of power in classroom interactions is examined in terms of a dominance continuum to advance a theoretical framework justifying the emergence of three ways of distributing power when it comes to dealing with the control over the teaching-studying-learning (TSL) "pattern of teacher domination," "pattern of…

"Practicing What We Preach: An Argument for Cooperative Learning Opportunities for Elementary and Secondary Educators"

ERIC Educational Resources Information Center

Coke, Pamela K.

2005-01-01

Van Allen (1996) supports a paradigm shift in how Americans think about education, from a view of school as hierarchy to school as continuum. While the relationship between elementary and secondary education is not always visible, teachers can model cooperative learning for students by working as a team across grade levels to solve problem,…

Recruitment of Itinerant Teachers of the Deaf and Hard of Hearing in Rural Arizona

ERIC Educational Resources Information Center

Thomas, Della W.

2010-01-01

Legislative mandate and judicial precedence of the guarantee of a free and appropriate public education for students with disabilities can be challenging to uphold in rural areas. 13 out of 15 counties in Arizona are in rural areas according to the US Department of Agriculture Rural-Urban continuum code, 2003, making the challenge of filling…

Embracing the Big Picture: The State of New Jersey's Road toward a PK3 Continuum. ACNJ Policy Brief

ERIC Educational Resources Information Center

Rice, Cynthia

2007-01-01

There is evidence demonstrating that when young children are part of a learning environment that is based on high standards/expectations, administrative and teacher leadership and continuity in learning opportunities across these grades, the better their developmental outcomes will be through grade three and in future years. By experiencing an…

How to Start, Build and Sustain a Multi-Credit Integrated Curriculum Package

ERIC Educational Resources Information Center

Wilson, Andrew Kerr

2011-01-01

Over the last 17 years, the author has been asked many times for help starting Integrated Curriculum Programs (ICPs). Visiting teachers are instantly engaged and enthused by the possibilities they see in his program. In this article, he provides a step-by-step road map to a full ICP continuum. By distilling the lessons of almost 20 years of…

A Multi-Year Program Developing an Explicit Reflective Pedagogy for Teaching Pre-service Teachers the Nature of Science by Ostention

NASA Astrophysics Data System (ADS)

Smith, Mike U.; Scharmann, Lawrence

2008-02-01

This investigation delineates a multi-year action research agenda designed to develop an instructional model for teaching the nature of science (NOS) to preservice science teachers. Our past research strongly supports the use of explicit reflective instructional methods, which includes Thomas Kuhn’s notion of learning by ostention and treating science as a continuum (i.e., comparing fields of study to one another for relative placement as less to more scientific). Instruction based on conceptual change precepts, however, also exhibits promise. Thus, the investigators sought to ascertain the degree to which conceptual change took place among students (n = 15) participating in the NOS instructional model. Three case studies are presented to illustrate successful conceptual changes that took place as a result of the NOS instructional model. All three cases represent students who claim a very conservative Christian heritage and for whom evolution was not considered a legitimate scientific theory prior to participating in the NOS instructional model. All three case study individuals, along with their twelve classmates, placed evolution as most scientific when compared to intelligent design and a fictional field of study called “Umbrellaology.”

77 FR 44653 - Continuum of Care Homeless Assistance Grant Application-Technical Submission

Federal Register 2010, 2011, 2012, 2013, 2014

2012-07-30

... DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT [Docket No. FR-5603-N-50] Continuum of Care Homeless... obtain more detailed technical information not contained in the original Continuum of Care Homeless...: Continuum of Care Homeless Assistance Grant Application--Technical Submission. OMB Approval Number: 2506...

Social, moral, and temporal qualities: Pre-service teachers' considerations of evolution and creation

NASA Astrophysics Data System (ADS)

Hahn, Deirdre

The introduction of the theories of evolution into public education has created a history of misinterpretation and uncertainty about its application to understanding deep time and human origins. Conceptions about negative social and moral outcomes of evolution itself along with cognitive temporal constraints may be difficult for many individuals to uncouple from the scientific theory, serving to provoke the ongoing debate about the treatment of evolution in science education. This debate about teaching evolution is strongly influenced by groups who strive to add creationism to the science curriculum for a balanced treatment of human origins and to mediate implied negative social and moral outcomes of evolution. Individual conceptualization of evolution and creation may influence the choice of college students to teach science. This study is designed to examine if pre-service teachers' conceptualize an evolutionary and creationist process of human development using certain social, moral or temporal patterns; and if the patterns follow a negative conceptual theme. The pilot study explored 21 pre-service teachers' conceptual representation of an evolutionary process through personal narratives. Participants tended to link evolutionary changes with negative social and moral consequences and seemed to have difficulty envisioning change over time. The pilot study was expanded to include a quantitative examination of attribute patterns of an evolutionary and creationist developmental process. Seventy-three pre-service teachers participated in the second experiment and tended to fall evenly along a continuum of creationist and evolutionist beliefs about life. Using a chi-square and principle components analysis, participants were found to map concepts of evolution and creation onto each other using troubling attributes of development to distinguish negative change over time. A strong negative social and moral pattern of human development was found in the creation condition, though only a vague negative human developmental process was found for the evolution condition. Based on these results, pre-service teachers may not use evolution as a viable explanation of human origins, which may serve to contribute to evolution theory debates and discourage pre-service teachers' choice of being science instructors.

Equivalent-Continuum Modeling of Nano-Structured Materials

NASA Technical Reports Server (NTRS)

Odegard, Gregory M.; Gates, Thomas S.; Nicholson, Lee M.; Wise, Kristopher E.

2001-01-01

A method has been developed for modeling structure-property relationships of nano-structured materials. This method serves as a link between computational chemistry and solid mechanics by substituting discrete molecular structures with an equivalent-continuum model. It has been shown that this substitution may be accomplished by equating the vibrational potential energy of a nano-structured material with the strain energy of representative truss and continuum models. As an important example with direct application to the development and characterization of single-walled carbon nanotubes, the model has been applied to determine the effective continuum geometry of a graphene sheet. A representative volume element of the equivalent-continuum model has been developed with an effective thickness. This effective thickness has been shown to be similar to, but slightly smaller than, the interatomic spacing of graphite.

Marine Technology for Teachers and Students: A Multi-modal Approach to Integrate Technology and Ocean Sciences Instruction

NASA Astrophysics Data System (ADS)

Gingras, A.; Knowlton, C. W.; Scowcroft, G. A.; Babb, I.; Coleman, D.; Morin, H.

2016-02-01

The Marine Technology for Teachers and Students (MaTTS) Project implements a year-long continuum of activities beginning with educators reading and reporting on peer-reviewed publications, followed by face-to-face, hands-on weekend workshops and virtual professional development activities. Teams of teacher and student leaders then participate in an intensive, residential Summer Institute (SI) that emphasizes hands-on building of marine related technologies and exposure to career pathways through direct interactions with ocean scientists and engineers. During the school year, teachers integrate ocean science technology and data into their classrooms and participate, along with colleagues and students from their schools, in science cafes and webinars. Student leaders transfer knowledge gained by engaging their district's middle school students in ocean science activities and technologies by serving as hosts for live broadcasts that connect classrooms with ocean scientists and engineers though the Inner Space Center, a national ocean science telecommunications hub. Communication technologies bridge formal and informal learning environments, allowing MaTTS participants to interact with their fellow cohort members, scientists, and engineers both during and outside of school. Evaluation results indicate that for teachers both the weekend workshops and SI were most effective in preparing them to integrate ocean science and technology in STEM curricula and increase their ocean science content knowledge and leadership characteristics. For students the SI and the middle school interactions supported gains in knowledge, awareness, leadership skills and interest in ocean sciences and technologies, and related STEM careers. In particular, the connections made by working directly with scientists have positively impacted both student and teacher leaders. This presentation will provide an overview of the MaTTS model and early evaluation results.

The Compton generator revisited

NASA Astrophysics Data System (ADS)

Siboni, S.

2014-09-01

The Compton generator, introduced in 1913 by the US physicist A H Compton as a relatively simple device to detect the Earth's rotation with respect to the distant stars, is analyzed and discussed in a general perspective. The paper introduces a generalized definition of the generator, emphasizing the special features of the original apparatus, and provides a suggestive interpretation of the way the device works. To this end, an intriguing electromagnetic analogy is developed, which turns out to be particularly useful in simplifying the calculations. Besides the more extensive description of the Compton generator in itself, the combined use of concepts and methods coming from different fields of physics, such as particle dynamics in moving references frames, continuum mechanics and electromagnetism, may be of interest to both teachers and graduate students.

LANGUAGE LEARNING--THE INTERMEDIATE PHASE. REPORTS OF THE WORKING COMMITTEES OF THE NORTHEAST CONFERENCE ON THE TEACHING OF FOREIGN LANGUAGES, 1963.

ERIC Educational Resources Information Center

BOTTIGLIA, WILLIAM F.

THESE REPORTS OF THE WORKING COMMITTEES OF THE 1963 NORTHEAST CONFERENCE ON THE TEACHING OF FOREIGN LANGUAGES ANALYZE PROBLEMS CONFRONTING LANGUAGE TEACHERS AS THEY PROGRESS FROM THE AUDIOLINGUAL ORIENTATION OF THE ELEMENTARY LEVELS TO THE INTERMEDIATE PHASE IN A CONTINUUM OF LANGUAGE STUDY. IN AN ATTEMPT TO DISCOVER WHETHER BILINGUALISM CAN BE…

[An analysis of kindergarden teachers' preparation to provide first aid].

PubMed

Woźniak, Jadwiga; Nowicki, Grzegorz; Goniewicz, Mariusz; Zielonka, Katarzyna; Górecki, Marek; Dzirba, Alina; Chemperek, Ewa

2011-01-01

The major causes of deaths among preschool children are injuries and poisoning. Among the injuries, the most frequent are road accidents and accidents on farms. We may also find health and life risks to preschoolers in homes and education centres. Everybody should know first-aid rules and how to apply them in life-threatening situations. This duty particularly concerns kindergarten teachers. The purpose of the work was an analysis of kindergarten teachers' preparation to provide first aid. The research was performed on a sample of 100 kindergarten teachers from the Lubelskie Province. The research took place in January and February 2011 with the use of questionnaires prepared in-house The analysis of the results indicated that most teachers (84% of respondents) had participated in the first-aid training courses. The teachers with job seniority below 10 years and those between 11 and 20 years' seniority took part more often in the first-aid training courses than the respondents with seniority above 20 years (p=0,02). Respondents, in most cases, assessed their knowledge of first aid at grade 3 (in a continuum from 1 to 5) (42% of respondents)--the average grade was 2.98 +/- 0.97.

Solar radio continuum storms and a breathing magnetic field model

NASA Technical Reports Server (NTRS)

1975-01-01

Radio noise continuum emissions observed in metric and decametric wave frequencies are, in general, associated with actively varying sunspot groups accompanied by the S-component of microwave radio emissions. These continuum emission sources, often called type I storm sources, are often associated with type III burst storm activity from metric to hectometric wave frequencies. This storm activity is, therefore, closely connected with the development of these continuum emission sources. It is shown that the S-component emission in microwave frequencies generally precedes, by several days, the emission of these noise continuum storms of lower frequencies. In order for these storms to develop, the growth of sunspot groups into complex types is very important in addition to the increase of the average magnetic field intensity and area of these groups. After giving a review on the theory of these noise continuum storm emissions, a model is briefly considered to explain the relation of the emissions to the storms.

[Competence development in undergraduate medical schools: a model with entrusted professional activities].

PubMed

Torruco-García, Uri; Ortiz-Montalvo, Armando; Varela-Ruiz, Margarita Elena; Hamui-Sutton, Alicia

2016-01-01

Today´s relevant educational models emphasize that a great part of learning be situated and reflexive; one of those is the Entrusted Professional Activities model. The study objective was to develop a model that integrates Entrusted Professional Activities with a medical school curriculum. From October 2012 a multidisciplinary group met to develop a model with the specialty of obstetrics and gynecology. From two published models of Entrusted Professional Activities and the curriculum of a school of medicine, blocks, units, and daily clinical practice charts were developed. The thematic content of the curriculum was integrated with the appropriate milestones for undergraduate students and the clinical practice needed to achieve it. We wrote a manual with 37 daily clinical practice charts for students (18 of gynecology and 19 of obstetrics) and 37 for teachers. Each chart content was the daily clinical practice, reflection activities, assessment instruments, and bibliography. It is feasible to combine a model of Entrusted Professional Activities with an undergraduate curriculum, which establishes a continuum with postgraduate education.

Supporting Reform-Oriented Secondary Science Teaching Through the Use of a Framework to Analyze Construction of Scientific Explanations

NASA Astrophysics Data System (ADS)

Richmond, Gail; Parker, Joyce M.; Kaldaras, Leonora

2016-08-01

The Next-Generation Science Standards (NGSS) call for a different approach to learning science. They promote three-dimensional (3D) learning that blends disciplinary core ideas, crosscutting concepts and scientific practices. In this study, we examined explanations constructed by secondary science teacher candidates (TCs) as a scientific practice outlined in the NGSS necessary for supporting students' learning of science in this 3D way. We examined TCs' ability to give explanations that include explicit statements of underlying reasons for natural phenomena, as opposed to simply describing patterns or laws. In their methods courses, TCs were taught to organize explanations into a what/how/why framework, where what refers to what happens in specific cases (data or observations); how refers to how things usually happen and is equivalent to patterns or laws; and why refers to causal explanations or models. We examined TCs' ability to do this spontaneously and in a resource-rich environment as a first step in gauging their preparedness for NGSS-aligned teaching. We found that (1) the ability of TCs to articulate complete and accurate causal scientific explanations for phenomena exists along a continuum; (2) TCs in our sample whose explanations fell on the upper end of this continuum were more likely to provide complete and accurate explanations even in the absence of support from explicit standards; and (3) teacher candidate's ability to construct complete and accurate explanations did not correlate with cross-course performance or academic major. The implications of these findings for the preparation of teachers for NGSS-based science instruction are discussed.

Childhood Poverty and Its Effect on Health and Well-being: Enhancing Training for Learners Across the Medical Education Continuum.

PubMed

Chamberlain, Lisa J; Hanson, Elizabeth R; Klass, Perri; Schickedanz, Adam; Nakhasi, Ambica; Barnes, Michelle M; Berger, Susan; Boyd, Rhea W; Dreyer, Benard P; Meyer, Dodi; Navsaria, Dipesh; Rao, Sheela; Klein, Melissa

2016-04-01

Childhood poverty is unacceptably common in the US and threatens the health, development, and lifelong well-being of millions of children. Health care providers should be prepared through medical curricula to directly address the health harms of poverty. In this article, authors from The Child Poverty Education Subcommittee (CPES) of the Academic Pediatric Association Task Force on Child Poverty describe the development of the first such child poverty curriculum for teachers and learners across the medical education continuum. Educators, physicians, trainees, and public health professionals from 25 institutions across the United States and Canada were convened over a 2-year period and addressed 3 goals: 1) define the core competencies of child poverty education, 2) delineate the scope and aims of a child poverty curriculum, and 3) create a child poverty curriculum ready to implement in undergraduate and graduate medical education settings. The CPES identified 4 core domains for the curriculum including the epidemiology of child poverty, poverty-related social determinants of health, pathophysiology of the health effects of poverty, and leadership and action to reduce and prevent poverty's health effects. Workgroups, focused on each domain, developed learning goals and objectives, built interactive learning modules to meet them, and created evaluation and faculty development materials to supplement the core curriculum. An editorial team with representatives from each workgroup coordinated activities and are preparing the final curriculum for national implementation. This comprehensive, standardized child poverty curriculum developed by an international group of educators in pediatrics and experts in the health effects of poverty should prepare medical trainees to address child poverty and improve the health of poor children. Copyright © 2016 Academic Pediatric Association. Published by Elsevier Inc. All rights reserved.

Class-first analysis in a continuum: an approach to the complexities of schools, society, and insurgent science

NASA Astrophysics Data System (ADS)

Valdiviezo, Laura Alicia

2010-06-01

This essay addresses Katherine Richardson Bruna's paper: Mexican Immigrant Transnational Social Capital and Class Transformation: Examining the Role of Peer Mediation in Insurgent Science, through five main points . First, I offer a comparison between the traditional analysis of classism in Latin America and Richardson Bruna's call for a class-first analysis in the North American social sciences where there has been a tendency to obviate the specific examination of class relations and class issues. Secondly, I discuss that a class-first analysis solely cannot suffice to depict the complex dimensions in the relations of schools and society. Thus, I suggest a continuum in the class-first analysis. Third, I argue that social constructions surrounding issues of language, ethnicity, and gender necessarily intersect with issues of class and that, in fact, those other constructions offer compatible epistemologies that aid in representing the complexity of social and institutional practices in the capitalist society. Richardson Bruna's analysis of Augusto's interactions with his teacher and peers in the science class provides a fourth point of discussion in this essay. As a final point in my response I discuss Richardson Bruna's idea of making accessible class-first analysis knowledge to educators and especially to science teachers.

[Psychiatric Rehabilitation - From the Linear Continuum Approach Towards Supported Inclusion].

PubMed

Richter, Dirk; Hertig, Res; Hoffmann, Holger

2016-11-01

Background: For many decades, psychiatric rehabilitation in the German-speaking countries is following a conventional linear continuum approach. Methods: Recent developments in important fields related to psychiatric rehabilitation (UN Convention on the Rights of People with Disabilities, theory of rehabilitation, empirical research) are reviewed. Results: Common to all developments in the reviewed fields are the principles of choice, autonomy and social inclusion. These principles contradict the conventional linear continuum approach. Conclusions: The linear continuum approach of psychiatric rehabilitation should be replaced by the "supported inclusion"-approach. © Georg Thieme Verlag KG Stuttgart · New York.

Continuum of Counseling Goals: A Framework for Differentiating Counseling Strategies.

ERIC Educational Resources Information Center

Bruce, Paul

1984-01-01

Presents counseling goals in a developmental continuum similar in concept to Maslow's hierarchy of needs. Discusses ego development goals, socialization goals, developmental goals, self-esteem goals, and self-realization goals and describes characteristics and implications of the continuum. (JAC)

Broadly continuously tunable slot waveguide quantum cascade lasers based on a continuum-to-continuum active region design

DOE Office of Scientific and Technical Information (OSTI.GOV)

Meng, Bo; Zeng, Yong Quan; Liang, Guozhen

2015-09-14

We report our progress in the development of broadly tunable single-mode slot waveguide quantum cascade lasers based on a continuum-to-continuum active region design. The electroluminescence spectrum of the continuum-to-continuum active region design has a full width at half maximum of 440 cm{sup −1} at center wavelength ∼10 μm at room temperature (300 K). Devices using the optimized slot waveguide structure and the continuum-to-continuum design can be tuned continuously with a lasing emission over 42 cm{sup −1}, from 9.74 to 10.16 μm, at room temperature by using only current tuning scheme, together with a side mode suppression ratio of above 15 dB within the whole tuning range.

Application of Mortar Coupling in Multiscale Modelling of Coupled Flow, Transport, and Biofilm Growth in Porous Media

NASA Astrophysics Data System (ADS)

Laleian, A.; Valocchi, A. J.; Werth, C. J.

2017-12-01

Multiscale models of reactive transport in porous media are capable of capturing complex pore-scale processes while leveraging the efficiency of continuum-scale models. In particular, porosity changes caused by biofilm development yield complex feedbacks between transport and reaction that are difficult to quantify at the continuum scale. Pore-scale models, needed to accurately resolve these dynamics, are often impractical for applications due to their computational cost. To address this challenge, we are developing a multiscale model of biofilm growth in which non-overlapping regions at pore and continuum spatial scales are coupled with a mortar method providing continuity at interfaces. We explore two decompositions of coupled pore-scale and continuum-scale regions to study biofilm growth in a transverse mixing zone. In the first decomposition, all reaction is confined to a pore-scale region extending the transverse mixing zone length. Only solute transport occurs in the surrounding continuum-scale regions. Relative to a fully pore-scale result, we find the multiscale model with this decomposition has a reduced run time and consistent result in terms of biofilm growth and solute utilization. In the second decomposition, reaction occurs in both an up-gradient pore-scale region and a down-gradient continuum-scale region. To quantify clogging, the continuum-scale model implements empirical relations between porosity and continuum-scale parameters, such as permeability and the transverse dispersion coefficient. Solutes are sufficiently mixed at the end of the pore-scale region, such that the initial reaction rate is accurately computed using averaged concentrations in the continuum-scale region. Relative to a fully pore-scale result, we find accuracy of biomass growth in the multiscale model with this decomposition improves as the interface between pore-scale and continuum-scale regions moves downgradient where transverse mixing is more fully developed. Also, this decomposition poses additional challenges with respect to mortar coupling. We explore these challenges and potential solutions. While recent work has demonstrated growing interest in multiscale models, further development is needed for their application to field-scale subsurface contaminant transport and remediation.

Equivalent-Continuum Modeling With Application to Carbon Nanotubes

NASA Technical Reports Server (NTRS)

Odegard, Gregory M.; Gates, Thomas S.; Nicholson, Lee M.; Wise, Kristopher E.

2002-01-01

A method has been proposed for developing structure-property relationships of nano-structured materials. This method serves as a link between computational chemistry and solid mechanics by substituting discrete molecular structures with equivalent-continuum models. It has been shown that this substitution may be accomplished by equating the vibrational potential energy of a nano-structured material with the strain energy of representative truss and continuum models. As important examples with direct application to the development and characterization of single-walled carbon nanotubes and the design of nanotube-based devices, the modeling technique has been applied to determine the effective-continuum geometry and bending rigidity of a graphene sheet. A representative volume element of the chemical structure of graphene has been substituted with equivalent-truss and equivalent continuum models. As a result, an effective thickness of the continuum model has been determined. This effective thickness has been shown to be significantly larger than the interatomic spacing of graphite. The effective thickness has been shown to be significantly larger than the inter-planar spacing of graphite. The effective bending rigidity of the equivalent-continuum model of a graphene sheet was determined by equating the vibrational potential energy of the molecular model of a graphene sheet subjected to cylindrical bending with the strain energy of an equivalent continuum plate subjected to cylindrical bending.

24 CFR 578.59 - Project administrative costs.

Code of Federal Regulations, 2014 CFR

2014-04-01

... URBAN DEVELOPMENT COMMUNITY FACILITIES CONTINUUM OF CARE PROGRAM Program Components and Eligible Costs... 10 percent of any grant awarded under this part, excluding the amount for Continuum of Care Planning... execution of Continuum of Care activities. This does not include staff and overhead costs directly related...

24 CFR 578.59 - Project administrative costs.

Code of Federal Regulations, 2013 CFR

2013-04-01

... URBAN DEVELOPMENT COMMUNITY FACILITIES CONTINUUM OF CARE PROGRAM Program Components and Eligible Costs... 10 percent of any grant awarded under this part, excluding the amount for Continuum of Care Planning... execution of Continuum of Care activities. This does not include staff and overhead costs directly related...

Science education through informal education

NASA Astrophysics Data System (ADS)

Kim, Mijung; Dopico, Eduardo

2016-06-01

To develop the pedagogic efficiency of informal education in science teaching, promoting a close cooperation between institutions is suggested by Monteiro, Janerine, de Carvalho, and Martins. In their article, they point out effective examples of how teachers and educators work together to develop programs and activities at informal education places such as science museums. Their study explored and discussed the viability and relevancy of school visits to museums and possibilities to enhance the connection between students' visits in informal contexts and their learning in schools. Given that students learn science by crossing the boundaries of formal and informal learning contexts, it is critical to examine ways of integrated and collaborative approach to develop scientific literacy to help students think, act and communicate as members of problem solving communities. In this forum, we suggest the importance of students' lifeworld contexts in informal learning places as continuum of Monteiro, Janerine, de Carvalho, and Martins' discussion on enhancing the effectiveness of informal learning places in science education.

A study of the influence of a preservice science teacher education program over time

NASA Astrophysics Data System (ADS)

Maher, Terrence Patrick

2009-12-01

This dissertation looks at the beliefs and practices of thirteen science teachers across the teaching continuum. Three pre-service teachers, four student teachers, three first year teachers and three teachers with three or more years of experience were participants in this longitudinal study that took place between 2006 and 2009. All participants were graduates of a large university in the southeastern United States. The study found that inquiry-based teaching practices were taught at the university and most participants believe that it is a superior way of teaching science. Using the Reformed Teaching Observation Protocol (RTOP) instrument to measure the amount of inquiry-based teaching, the following findings were made: The highest level of inquiry-based teaching occurs during pre-service education. This was the only group to score within the "reformed-based" teaching range. The total RTOP scores decreased into the traditional teaching practice range during student teaching. The scores continued to decrease during the first and second years of teaching, showing an even stronger prevalence toward traditional teaching. A slight increase in the average total RTOP scores was noted with teachers having three or more years of experience. But even these teachers' scores were well within the traditional teaching method range. When interviewed, the most common reasons cited by these teachers for not using inquiry-based practice in the public classrooms were high stakes testing, crowded class sizes, and lack of equipment/support.

Progress toward bridging from atomistic to continuum modeling to predict nuclear waste glass dissolution.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Zapol, Peter; Bourg, Ian; Criscenti, Louise Jacqueline

2011-10-01

This report summarizes research performed for the Nuclear Energy Advanced Modeling and Simulation (NEAMS) Subcontinuum and Upscaling Task. The work conducted focused on developing a roadmap to include molecular scale, mechanistic information in continuum-scale models of nuclear waste glass dissolution. This information is derived from molecular-scale modeling efforts that are validated through comparison with experimental data. In addition to developing a master plan to incorporate a subcontinuum mechanistic understanding of glass dissolution into continuum models, methods were developed to generate constitutive dissolution rate expressions from quantum calculations, force field models were selected to generate multicomponent glass structures and gel layers,more » classical molecular modeling was used to study diffusion through nanopores analogous to those in the interfacial gel layer, and a micro-continuum model (K{mu}C) was developed to study coupled diffusion and reaction at the glass-gel-solution interface.« less

Continuum theory of edge states of topological insulators: variational principle and boundary conditions.

PubMed

Medhi, Amal; Shenoy, Vijay B

2012-09-05

We develop a continuum theory to model low energy excitations of a generic four-band time reversal invariant electronic system with boundaries. We propose a variational energy functional for the wavefunctions which allows us to derive natural boundary conditions valid for such systems. Our formulation is particularly suited for developing a continuum theory of the protected edge/surface excitations of topological insulators both in two and three dimensions. By a detailed comparison of our analytical formulation with tight binding calculations of ribbons of topological insulators modelled by the Bernevig-Hughes-Zhang (BHZ) Hamiltonian, we show that the continuum theory with a natural boundary condition provides an appropriate description of the low energy physics.

Considerations for the Development of a Substance-Related Care and Prevention Continuum Model

PubMed Central

Perlman, David C.; Jordan, Ashly E.

2017-01-01

There are significant gaps in the identification and engagement in care and prevention services of people who use illicit substances. Care continuum models have proven to be useful tools in the evaluation of care for HIV and other conditions; numerous issues in substance-related care and prevention resemble those identified in other continua models. Systems of care for substance misuse and substance use disorders (SUDs) can be viewed as consisting of a prevention and care continuum, reflecting incidence and prevalence of substance misuse and SUDs, screening and identification, medical and psychosocial evaluation for treatment, engagement in evidence-based treatment, treatment retention, relapse prevention, timeliness of step completion, and measures of overall and substance use-related specific morbidity and mortality. Care and prevention continuum models could potentially be applied at program, local, regional, state, and national levels. We discuss important lessons that can be drawn from applications of continuum models in other fields. The development and use of a substance-related care and prevention continuum may yield significant patient care, program evaluation and improvement, and population-level benefits. PMID:28770195

Development of a multiaxial viscoelastoplastic continuum damage model for asphalt mixtures.

DOT National Transportation Integrated Search

2009-09-01

This report highlights findings from the FHWA DTFH61-05-H-00019 project, which focused on the development of the multiaxial viscoelastoplastic continuum damage model for asphalt concrete in both compression and tension. Asphalt concrete pavement, one...

Continuum Fatigue Damage Modeling for Use in Life Extending Control

NASA Technical Reports Server (NTRS)

Lorenzo, Carl F.

1994-01-01

This paper develops a simplified continuum (continuous wrp to time, stress, etc.) fatigue damage model for use in Life Extending Controls (LEC) studies. The work is based on zero mean stress local strain cyclic damage modeling. New nonlinear explicit equation forms of cyclic damage in terms of stress amplitude are derived to facilitate the continuum modeling. Stress based continuum models are derived. Extension to plastic strain-strain rate models are also presented. Application of these models to LEC applications is considered. Progress toward a nonzero mean stress based continuum model is presented. Also, new nonlinear explicit equation forms in terms of stress amplitude are also derived for this case.

Gradient Models in Molecular Biophysics: Progress, Challenges, Opportunities

PubMed Central

Bardhan, Jaydeep P.

2014-01-01

In the interest of developing a bridge between researchers modeling materials and those modeling biological molecules, we survey recent progress in developing nonlocal-dielectric continuum models for studying the behavior of proteins and nucleic acids. As in other areas of science, continuum models are essential tools when atomistic simulations (e.g. molecular dynamics) are too expensive. Because biological molecules are essentially all nanoscale systems, the standard continuum model, involving local dielectric response, has basically always been dubious at best. The advanced continuum theories discussed here aim to remedy these shortcomings by adding features such as nonlocal dielectric response, and nonlinearities resulting from dielectric saturation. We begin by describing the central role of electrostatic interactions in biology at the molecular scale, and motivate the development of computationally tractable continuum models using applications in science and engineering. For context, we highlight some of the most important challenges that remain and survey the diverse theoretical formalisms for their treatment, highlighting the rigorous statistical mechanics that support the use and improvement of continuum models. We then address the development and implementation of nonlocal dielectric models, an approach pioneered by Dogonadze, Kornyshev, and their collaborators almost forty years ago. The simplest of these models is just a scalar form of gradient elasticity, and here we use ideas from gradient-based modeling to extend the electrostatic model to include additional length scales. The paper concludes with a discussion of open questions for model development, highlighting the many opportunities for the materials community to leverage its physical, mathematical, and computational expertise to help solve one of the most challenging questions in molecular biology and biophysics. PMID:25505358

Gradient Models in Molecular Biophysics: Progress, Challenges, Opportunities.

PubMed

Bardhan, Jaydeep P

2013-12-01

In the interest of developing a bridge between researchers modeling materials and those modeling biological molecules, we survey recent progress in developing nonlocal-dielectric continuum models for studying the behavior of proteins and nucleic acids. As in other areas of science, continuum models are essential tools when atomistic simulations (e.g. molecular dynamics) are too expensive. Because biological molecules are essentially all nanoscale systems, the standard continuum model, involving local dielectric response, has basically always been dubious at best. The advanced continuum theories discussed here aim to remedy these shortcomings by adding features such as nonlocal dielectric response, and nonlinearities resulting from dielectric saturation. We begin by describing the central role of electrostatic interactions in biology at the molecular scale, and motivate the development of computationally tractable continuum models using applications in science and engineering. For context, we highlight some of the most important challenges that remain and survey the diverse theoretical formalisms for their treatment, highlighting the rigorous statistical mechanics that support the use and improvement of continuum models. We then address the development and implementation of nonlocal dielectric models, an approach pioneered by Dogonadze, Kornyshev, and their collaborators almost forty years ago. The simplest of these models is just a scalar form of gradient elasticity, and here we use ideas from gradient-based modeling to extend the electrostatic model to include additional length scales. The paper concludes with a discussion of open questions for model development, highlighting the many opportunities for the materials community to leverage its physical, mathematical, and computational expertise to help solve one of the most challenging questions in molecular biology and biophysics.

Gradient models in molecular biophysics: progress, challenges, opportunities

NASA Astrophysics Data System (ADS)

Bardhan, Jaydeep P.

2013-12-01

In the interest of developing a bridge between researchers modeling materials and those modeling biological molecules, we survey recent progress in developing nonlocal-dielectric continuum models for studying the behavior of proteins and nucleic acids. As in other areas of science, continuum models are essential tools when atomistic simulations (e.g., molecular dynamics) are too expensive. Because biological molecules are essentially all nanoscale systems, the standard continuum model, involving local dielectric response, has basically always been dubious at best. The advanced continuum theories discussed here aim to remedy these shortcomings by adding nonlocal dielectric response. We begin by describing the central role of electrostatic interactions in biology at the molecular scale, and motivate the development of computationally tractable continuum models using applications in science and engineering. For context, we highlight some of the most important challenges that remain, and survey the diverse theoretical formalisms for their treatment, highlighting the rigorous statistical mechanics that support the use and improvement of continuum models. We then address the development and implementation of nonlocal dielectric models, an approach pioneered by Dogonadze, Kornyshev, and their collaborators almost 40 years ago. The simplest of these models is just a scalar form of gradient elasticity, and here we use ideas from gradient-based modeling to extend the electrostatic model to include additional length scales. The review concludes with a discussion of open questions for model development, highlighting the many opportunities for the materials community to leverage its physical, mathematical, and computational expertise to help solve one of the most challenging questions in molecular biology and biophysics.

Coupling discrete and continuum concentration particle models for multiscale and hybrid molecular-continuum simulations

NASA Astrophysics Data System (ADS)

Petsev, Nikolai D.; Leal, L. Gary; Shell, M. Scott

2017-12-01

Hybrid molecular-continuum simulation techniques afford a number of advantages for problems in the rapidly burgeoning area of nanoscale engineering and technology, though they are typically quite complex to implement and limited to single-component fluid systems. We describe an approach for modeling multicomponent hydrodynamic problems spanning multiple length scales when using particle-based descriptions for both the finely resolved (e.g., molecular dynamics) and coarse-grained (e.g., continuum) subregions within an overall simulation domain. This technique is based on the multiscale methodology previously developed for mesoscale binary fluids [N. D. Petsev, L. G. Leal, and M. S. Shell, J. Chem. Phys. 144, 084115 (2016)], simulated using a particle-based continuum method known as smoothed dissipative particle dynamics. An important application of this approach is the ability to perform coupled molecular dynamics (MD) and continuum modeling of molecularly miscible binary mixtures. In order to validate this technique, we investigate multicomponent hybrid MD-continuum simulations at equilibrium, as well as non-equilibrium cases featuring concentration gradients.

A Continuum Approach for Developing School Leaders in an Urban District

ERIC Educational Resources Information Center

Normore, Anthony

2007-01-01

This study examined a four-staged leadership development continuum for school leaders in a large urban school district in the southeastern United States. The program under examination included: LEAD Program; Interim Assistant Principal Program; Intern Principal Program, and; First Year Principal Support/Interim Principal Program. Qualitative…

Conceptions of the nature of science and worldviews of preservice elementary science teachers in Taiwan

NASA Astrophysics Data System (ADS)

Liu, Shiang-Yao

This exploratory investigation aimed to identify preservice science teachers' conceptions of the nature of science (NOS), and worldviews that represent their culturally dependent beliefs about the world, in the context of Taiwan. The interrelationships between the responses elicited from both the assessments of NOS understandings and worldviews were examined. Participants included 54 third-year students enrolled in the departments of science education and mathematics education at a teachers college. Their worldviews and NOS conceptions were tabulated by two questionnaires and 14 of them were purposefully selected to participate follow-up interviews. The worldview questionnaire contained five open-ended items, of which each examines one of the worldview domains in Kearney's model (1984). The NOS questionnaire consisting of nine open-ended questions was developed, specifically addressing cultural characteristics, to assess participants' views on the development of scientific knowledge. An anthropocentric-moderate continuum emerged to describe participants' views of the humanity's relationship with Nature. It was found that participants with informed NOS conceptions were more likely to emphasize harmony with Nature, recognize the limitations of scientific knowledge, and accept the idea that science involves subjective and cultural components. On the other hand, participants who provided a pragmatic perspective of Nature seemed to possess narrow views about the scientific enterprises by describing science as close to technology and as a materialistic benefit. Authoritarianism was also a noticeable cultural trait hindering some participants from reflecting on the values inherent to the development of scientific knowledge, and also prohibiting them from searching empirical evidence to solve problems. It was found that there were differences between science education and mathematics education majors in their worldviews and NOS understandings. The results in this study not only depict a group of nonwestern preservice teachers' worldviews, but also reveal the interplay between their sociocultural beliefs and NOS conceptions. People with different worldviews may have differing views about science. The study calls for the consideration of incorporating sociocultural perspectives in science instruction and the need for introducing contemporary conceptions of the NOS to science learners.

The Paranoid-Depressive Continuum

ERIC Educational Resources Information Center

Johnson, Betty J.

1977-01-01

Few investigators have attempted to lay a conceptual base for comparative studies of paranoia and depression within a single general framework. The paranoid-depressive continuum is an attempt to develop such a framework. (Author)

Western teachers of science or teachers of Western science: On the influence of Western modern science in a post-colonial context

NASA Astrophysics Data System (ADS)

Burke, Lydia E. Carol-Ann

An expanding body of research explores the social, political, cultural and personal challenges presented by the Western emphasis of curricula around the world. The aim of my study is to advance this field of inquiry by gaining insight into perceptions of Western modern science presented by students, teachers and administrators in a given Caribbean setting. Through this study I asked how my research participants described the nature of scientific knowledge, how they related scientific knowledge to other culturally-valued knowledges and the meanings they attached to the geographic origins of science teachers. Situating this work firmly within the practice of Foucauldian critical discourse analysis, I have utilised a conceptual framework defined by the power/knowledge and complicity/resistance themes of post-colonial theory to support my interpretation of participant commentary in an overall quest that is concerned about the ways in which Western modern science might be exerting a colonising influence. Fourteen students, nine teachers (both expatriate and local) and three administrators participated in the study. I combined a semi-structured question and answer interview format with a card sort activity. I used a procedure based on my own adaptation of Stephenson's Q methodology, where the respondents placed 24 statements hierarchically along a continuum of increasing strength of agreement, presenting their rationalisations, personal stories and illustrations as they sorted. I used an inverse factor analysis, in combination with the interview transcripts, to assist me in the identification of three discourse positions described by my research participants: The truth value of scientific knowledge, The pragmatic use of science to promote progress, and The priority of cultural preservation. The interview transcripts were also analysed for emergent themes, providing an additional layer of data interpretation. The research findings raise concerns regarding the hegemonic potency of certain scientific assumptions and assertions of participants, leading me to emphasise the importance of developing teachers' knowledge of the historical, philosophical and social background of Western modern science as well as focusing on developing the conceptual and intellectual engagement of students with Western modern science without demanding the kind of belief commitment that would insist that students replace alternative modes of meaning making.

Prediction of Size Effects in Notched Laminates Using Continuum Damage Mechanics

NASA Technical Reports Server (NTRS)

Camanho, D. P.; Maimi, P.; Davila, C. G.

2007-01-01

This paper examines the use of a continuum damage model to predict strength and size effects in notched carbon-epoxy laminates. The effects of size and the development of a fracture process zone before final failure are identified in an experimental program. The continuum damage model is described and the resulting predictions of size effects are compared with alternative approaches: the point stress and the inherent flaw models, the Linear-Elastic Fracture Mechanics approach, and the strength of materials approach. The results indicate that the continuum damage model is the most accurate technique to predict size effects in composites. Furthermore, the continuum damage model does not require any calibration and it is applicable to general geometries and boundary conditions.

Hybrid plasma modeling.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Hopkins, Matthew Morgan; DeChant, Lawrence Justin.; Piekos, Edward Stanley

2009-02-01

This report summarizes the work completed during FY2007 and FY2008 for the LDRD project ''Hybrid Plasma Modeling''. The goal of this project was to develop hybrid methods to model plasmas across the non-continuum-to-continuum collisionality spectrum. The primary methodology to span these regimes was to couple a kinetic method (e.g., Particle-In-Cell) in the non-continuum regions to a continuum PDE-based method (e.g., finite differences) in continuum regions. The interface between the two would be adjusted dynamically ased on statistical sampling of the kinetic results. Although originally a three-year project, it became clear during the second year (FY2008) that there were not sufficientmore » resources to complete the project and it was terminated mid-year.« less

Theoretical Calculation and Validation of the Water Vapor Continuum Absorption

NASA Technical Reports Server (NTRS)

Ma, Qiancheng; Tipping, Richard H.

1998-01-01

The primary objective of this investigation is the development of an improved parameterization of the water vapor continuum absorption through the refinement and validation of our existing theoretical formalism. The chief advantage of our approach is the self-consistent, first principles, basis of the formalism which allows us to predict the frequency, temperature and pressure dependence of the continuum absorption as well as provide insights into the physical mechanisms responsible for the continuum absorption. Moreover, our approach is such that the calculated continuum absorption can be easily incorporated into satellite retrieval algorithms and climate models. Accurate determination of the water vapor continuum is essential for the next generation of retrieval algorithms which propose to use the combined constraints of multispectral measurements such as those under development for EOS data analysis (e.g., retrieval algorithms based on MODIS and AIRS measurements); current Pathfinder activities which seek to use the combined constraints of infrared and microwave (e.g., HIRS and MSU) measurements to improve temperature and water profile retrievals, and field campaigns which seek to reconcile spectrally-resolved and broad-band measurements such as those obtained as part of FIRE. Current widely used continuum treatments have been shown to produce spectrally dependent errors, with the magnitude of the error dependent on temperature and abundance which produces errors with a seasonal and latitude dependence. Translated into flux, current water vapor continuum parameterizations produce flux errors of order 10 W/sq m, which compared to the 4 W/sq m magnitude of the greenhouse gas forcing and the 1-2 W/sq m estimated aerosol forcing is certainly climatologically significant and unacceptably large. While it is possible to tune the empirical formalisms, the paucity of laboratory measurements, especially at temperatures of interest for atmospheric applications, preclude tuning, the empirical continuum models over the full spectral range of interest for remote sensing and climate applications. Thus, we propose to further develop and refine our existing, far-wing formalism to provide an improved treatment applicable from the near-infrared through the microwave. Based on the results of this investigation, we will provide to the remote sensing/climate modeling community a practical and accurate tabulation of the continuum absorption covering the near-infrared through the microwave region of the spectrum for the range of temperatures and pressures of interest for atmospheric applications.

Theoretical Calculation and Validation of the Water Vapor Continuum Absorption

NASA Technical Reports Server (NTRS)

Ma, Qiancheng; Tipping, Richard H.

1998-01-01

The primary objective of this investigation is the development of an improved parameterization of the water vapor continuum absorption through the refinement and validation of our existing theoretical formalism. The chief advantage of our approach is the self-consistent, first principles, basis of the formalism which allows us to predict the frequency, temperature and pressure dependence of the continuum absorption as well as provide insights into the physical mechanisms responsible for the continuum absorption. Moreover, our approach is such that the calculated continuum absorption can be easily incorporated into satellite retrieval algorithms and climate models. Accurate determination of the water vapor continuum is essential for the next generation of retrieval algorithms which propose to use the combined constraints of multi-spectral measurements such as those under development for EOS data analysis (e.g., retrieval algorithms based on MODIS and AIRS measurements); current Pathfinder activities which seek to use the combined constraints of infrared and microwave (e.g., HIRS and MSU) measurements to improve temperature and water profile retrievals, and field campaigns which seek to reconcile spectrally-resolved and broad-band measurements such as those obtained as part of FIRE. Current widely used continuum treatments have been shown to produce spectrally dependent errors, with the magnitude of the error dependent on temperature and abundance which produces errors with a seasonal and latitude dependence. Translated into flux, current water vapor continuum parameterizations produce flux errors of order 10 W/ml, which compared to the 4 W/m' magnitude of the greenhouse gas forcing and the 1-2 W/m' estimated aerosol forcing is certainly climatologically significant and unacceptably large. While it is possible to tune the empirical formalisms, the paucity of laboratory measurements, especially at temperatures of interest for atmospheric applications, preclude tuning the empirical continuum models over the full spectral range of interest for remote sensing and climate applications. Thus, we propose to further develop and refine our existing far-wing formalism to provide an improved treatment applicable from the near-infrared through the microwave. Based on the results of this investigation, we will provide to the remote sensing/climate modeling community a practical and accurate tabulation of the continuum absorption covering the near-infrared through the microwave region of the spectrum for the range of temperatures and pressures of interest for atmospheric applications.

Cross-continuum Care Continuity: Achieving Seamless Care and Managing Comorbidities.

PubMed

Boston-Fleischhauer, Carol; Rose, Robert; Hartwig, Laurie

As healthcare systems continue to design care models responsive to payment changes and the assumption of clinical and financial risk, the need exists for a comprehensive approach to address cross-continuum care transitions. This article will highlight key learnings from the Nurse Executive Center's research on achieving care continuity. The business case for developing a cross-continuum care transition strategy will be discussed, as well as systemic enablers for the achievement of seamless care. A case study example of 1 system's solution for supporting the multiple comorbid patient population as part of its cross-continuum care transition strategy will be examined.

Microstructural comparison of the kinematics of discrete and continuum dislocations models

NASA Astrophysics Data System (ADS)

Sandfeld, Stefan; Po, Giacomo

2015-12-01

The Continuum Dislocation Dynamics (CDD) theory and the Discrete Dislocation Dynamics (DDD) method are compared based on concise mathematical formulations of the coarse graining of discrete data. A numerical tool for converting from a discrete to a continuum representation of a given dislocation configuration is developed, which allows to directly compare both simulation approaches based on continuum quantities (e.g. scalar density, geometrically necessary densities, mean curvature). Investigating the evolution of selected dislocation configurations within analytically given velocity fields for both DDD and CDD reveals that CDD contains a surprising number of important microstructural details.

A Micro-Mechanism-Based Continuum Corrosion Fatigue Damage Model for Steels

NASA Astrophysics Data System (ADS)

Sun, Bin; Li, Zhaoxia

2018-05-01

A micro-mechanism-based corrosion fatigue damage model is developed for studying the high-cycle corrosion fatigue of steel from multi-scale viewpoint. The developed physical corrosion fatigue damage model establishes micro-macro relationships between macroscopic continuum damage evolution and collective evolution behavior of microscopic pits and cracks, which can be used to describe the multi-scale corrosion fatigue process of steel. As a case study, the model is used to predict continuum damage evolution and number density of the corrosion pit and short crack of steel component in 5% NaCl water under constant stress amplitude at 20 kHz, and the numerical results are compared with experimental results. It shows that the model is effective and can be used to evaluate the continuum macroscopic corrosion fatigue damage and study microscopic corrosion fatigue mechanisms of steel.

A Micro-Mechanism-Based Continuum Corrosion Fatigue Damage Model for Steels

NASA Astrophysics Data System (ADS)

Sun, Bin; Li, Zhaoxia

2018-04-01

A micro-mechanism-based corrosion fatigue damage model is developed for studying the high-cycle corrosion fatigue of steel from multi-scale viewpoint. The developed physical corrosion fatigue damage model establishes micro-macro relationships between macroscopic continuum damage evolution and collective evolution behavior of microscopic pits and cracks, which can be used to describe the multi-scale corrosion fatigue process of steel. As a case study, the model is used to predict continuum damage evolution and number density of the corrosion pit and short crack of steel component in 5% NaCl water under constant stress amplitude at 20 kHz, and the numerical results are compared with experimental results. It shows that the model is effective and can be used to evaluate the continuum macroscopic corrosion fatigue damage and study microscopic corrosion fatigue mechanisms of steel.

Towards a physics on fractals: Differential vector calculus in three-dimensional continuum with fractal metric

NASA Astrophysics Data System (ADS)

Balankin, Alexander S.; Bory-Reyes, Juan; Shapiro, Michael

2016-02-01

One way to deal with physical problems on nowhere differentiable fractals is the mapping of these problems into the corresponding problems for continuum with a proper fractal metric. On this way different definitions of the fractal metric were suggested to account for the essential fractal features. In this work we develop the metric differential vector calculus in a three-dimensional continuum with a non-Euclidean metric. The metric differential forms and Laplacian are introduced, fundamental identities for metric differential operators are established and integral theorems are proved by employing the metric version of the quaternionic analysis for the Moisil-Teodoresco operator, which has been introduced and partially developed in this paper. The relations between the metric and conventional operators are revealed. It should be emphasized that the metric vector calculus developed in this work provides a comprehensive mathematical formalism for the continuum with any suitable definition of fractal metric. This offers a novel tool to study physics on fractals.

Development of a Continuum of Services for Children and Adults with Autism and Other Severe Behavior Disorders.

ERIC Educational Resources Information Center

Luce, Stephen C.; And Others

1992-01-01

Key elements of a continuum of services for individuals with autism and other severe behavior disorders are described, focusing on development of a strong central organization; funding; staff recruitment, training, supervision, and evaluation; program evaluation; outreach parent training; home-based early intervention; vocational training;…

The development of a science process assessment for fourth-grade students

NASA Astrophysics Data System (ADS)

Smith, Kathleen A.; Welliver, Paul W.

In this study, a multiple-choice test entitled the Science Process Assessment was developed to measure the science process skills of students in grade four. Based on the Recommended Science Competency Continuum for Grades K to 6 for Pennsylvania Schools, this instrument measured the skills of (1) observing, (2) classifying, (3) inferring, (4) predicting, (5) measuring, (6) communicating, (7) using space/time relations, (8) defining operationally, (9) formulating hypotheses, (10) experimenting, (11) recognizing variables, (12) interpreting data, and (13) formulating models. To prepare the instrument, classroom teachers and science educators were invited to participate in two science education workshops designed to develop an item bank of test questions applicable to measuring process skill learning. Participants formed writing teams and generated 65 test items representing the 13 process skills. After a comprehensive group critique of each item, 61 items were identified for inclusion into the Science Process Assessment item bank. To establish content validity, the item bank was submitted to a select panel of science educators for the purpose of judging item acceptability. This analysis yielded 55 acceptable test items and produced the Science Process Assessment, Pilot 1. Pilot 1 was administered to 184 fourth-grade students. Students were given a copy of the test booklet; teachers read each test aloud to the students. Upon completion of this first administration, data from the item analysis yielded a reliability coefficient of 0.73. Subsequently, 40 test items were identified for the Science Process Assessment, Pilot 2. Using the test-retest method, the Science Process Assessment, Pilot 2 (Test 1 and Test 2) was administered to 113 fourth-grade students. Reliability coefficients of 0.80 and 0.82, respectively, were ascertained. The correlation between Test 1 and Test 2 was 0.77. The results of this study indicate that (1) the Science Process Assessment, Pilot 2, is a valid and reliable instrument applicable to measuring the science process skills of students in grade four, (2) using educational workshops as a means of developing item banks of test questions is viable and productive in the test development process, and (3) involving classroom teachers and science educators in the test development process is educationally efficient and effective.

A cross-age study of students' conceptual understanding of interdependency in seed dispersal, pollination, and food chains using a constructivist theoretical framework

NASA Astrophysics Data System (ADS)

Smith, Shirley Mccraw

2003-06-01

The purpose of this research was to investigate students' understanding of interdependency across grade levels. Interdependency concepts selected for this study included food chains, pollination, and seed dispersal. Children's everyday concepts and scientific concepts across grade levels represented the focus of conceptual understanding. The researcher interviewed a total of 24 students across grade levels, six students each from grades 3, 7, and 10, and 6 college students. Data were collected by means of interviews and card sorts. A constructivist theoretical framework formed the groundwork for presenting the focus of this study and for interpreting the results of the interview data. Results were analyzed on the basis of identifying student responses to interview questions as either everyday concepts or as scientific concepts, along with transition through the zone of proximal development (ZPD) by mediation, as developed by Vygotsky. Results revealed that children across grade levels vary in their everyday and scientific understanding of the three interdependency concepts. Results for seed dispersal showed little evidence of understanding for grade 3, that is, seed dispersal was not within the zone of proximal development (ZPD) for grade 3 students. Students in grades 7 and 10 showed a developing transition within the zone of proximal development from everyday to scientific understanding, and college students demonstrated scientific understanding of seed dispersal. For pollination and food chains, results showed that grades 3, 7, and 10 were in transition from everyday to scientific understanding, and all college students demonstrated scientific understanding. The seed dispersal concept proved more complex than pollination and food chains. The findings of this study have implications for classroom teachers. By understanding the dynamic nature of the ZPD continuum for students, teachers can plan instruction to meet the needs of each student.

Simulation and theory of spontaneous TAE frequency sweeping

NASA Astrophysics Data System (ADS)

Wang, Ge; Berk, H. L.

2012-09-01

A simulation model, based on the linear tip model of Rosenbluth, Berk and Van Dam (RBV), is developed to study frequency sweeping of toroidal Alfvén eigenmodes (TAEs). The time response of the background wave in the RBV model is given by a Volterra integral equation. This model captures the properties of TAE waves both in the gap and in the continuum. The simulation shows that phase space structures form spontaneously at frequencies close to the linearly predicted frequency, due to resonant particle-wave interactions and background dissipation. The frequency sweeping signals are found to chirp towards the upper and lower continua. However, the chirping signals penetrate only the lower continuum, whereupon the frequency chirps and mode amplitude increases in synchronism to produce an explosive solution. An adiabatic theory describing the evolution of a chirping signal is developed which replicates the chirping dynamics of the simulation in the lower continuum. This theory predicts that a decaying chirping signal will terminate at the upper continuum though in the numerical simulation the hole disintegrates before the upper continuum is reached.

Providing a Continuum of Leadership in Polar Science - An IPY Legacy

NASA Astrophysics Data System (ADS)

Baeseman, J.

2008-12-01

The Association of Polar Early Career Scientists (APECS) grew out of the 4th International Polar Year (IPY-4) 2007-08 and is an international and interdisciplinary organization of over 1200 undergraduate and graduate students, postdoctoral researchers, early faculty members, educators and others with interests in Polar Regions and the wider cryosphere from more than 40 countries. Our aims are to stimulate interdisciplinary and international research collaborations, and develop effective future leaders in polar research, education and outreach. As potentially one of the major legacies of IPY-4, APECS members have been at the forefront of increasing scientific knowledge and public interest in the polar regions, centered around global climate change, and enhancing scientific understanding, media attention, primary and secondary school (K-12) educational programs, and public literacy campaigns. Research and Educational Outreach activities by APECS members during IPY-4 have improved both our understanding and the communication of all aspects of the Polar Regions and the importance of their broader global connections. APECS National Committees have run Polar Contests where young researchers partnered with teachers and students to develop curriculum and activities to share their research, have participated in many field based communication exchanges and are mentoring youth to pursue careers in science, and enhancing the public perception of scientists through photo, video and museum exhibits. In cooperation with the IPY Teachers Network and the IPY IPO, APECS is developing a polar education resource book that will feature education and outreach activities by young researchers, as well as provide examples of classroom activities for teachers to incorporate polar literacy into their curriculum and a 'how to' guide for researchers interested in conducting education and outreach. As young researchers share their excitement and experiences in deepening our understanding of the polar regions, a new generation of polar literate people emerges and society benefits from more knowledge of the rapidly changing polar regions that have a critical and inherent global connection.

Coupling discrete and continuum concentration particle models for multiscale and hybrid molecular-continuum simulations

DOE PAGES

Petsev, Nikolai Dimitrov; Leal, L. Gary; Shell, M. Scott

2017-12-21

Hybrid molecular-continuum simulation techniques afford a number of advantages for problems in the rapidly burgeoning area of nanoscale engineering and technology, though they are typically quite complex to implement and limited to single-component fluid systems. We describe an approach for modeling multicomponent hydrodynamic problems spanning multiple length scales when using particle-based descriptions for both the finely-resolved (e.g. molecular dynamics) and coarse-grained (e.g. continuum) subregions within an overall simulation domain. This technique is based on the multiscale methodology previously developed for mesoscale binary fluids [N. D. Petsev, L. G. Leal, and M. S. Shell, J. Chem. Phys. 144, 84115 (2016)], simulatedmore » using a particle-based continuum method known as smoothed dissipative particle dynamics (SDPD). An important application of this approach is the ability to perform coupled molecular dynamics (MD) and continuum modeling of molecularly miscible binary mixtures. In order to validate this technique, we investigate multicomponent hybrid MD-continuum simulations at equilibrium, as well as non-equilibrium cases featuring concentration gradients.« less

Coupling discrete and continuum concentration particle models for multiscale and hybrid molecular-continuum simulations

DOE Office of Scientific and Technical Information (OSTI.GOV)

Petsev, Nikolai Dimitrov; Leal, L. Gary; Shell, M. Scott

Hybrid molecular-continuum simulation techniques afford a number of advantages for problems in the rapidly burgeoning area of nanoscale engineering and technology, though they are typically quite complex to implement and limited to single-component fluid systems. We describe an approach for modeling multicomponent hydrodynamic problems spanning multiple length scales when using particle-based descriptions for both the finely-resolved (e.g. molecular dynamics) and coarse-grained (e.g. continuum) subregions within an overall simulation domain. This technique is based on the multiscale methodology previously developed for mesoscale binary fluids [N. D. Petsev, L. G. Leal, and M. S. Shell, J. Chem. Phys. 144, 84115 (2016)], simulatedmore » using a particle-based continuum method known as smoothed dissipative particle dynamics (SDPD). An important application of this approach is the ability to perform coupled molecular dynamics (MD) and continuum modeling of molecularly miscible binary mixtures. In order to validate this technique, we investigate multicomponent hybrid MD-continuum simulations at equilibrium, as well as non-equilibrium cases featuring concentration gradients.« less

On the origin of the water vapor continuum absorption within rotational and fundamental vibrational bands

NASA Astrophysics Data System (ADS)

Serov, E. A.; Odintsova, T. A.; Tretyakov, M. Yu.; Semenov, V. E.

2017-05-01

Analysis of the continuum absorption in water vapor at room temperature within the purely rotational and fundamental ro-vibrational bands shows that a significant part (up to a half) of the observed absorption cannot be explained within the framework of the existing concepts of the continuum. Neither of the two most prominent mechanisms of continuum originating, namely, the far wings of monomer lines and the dimers, cannot reproduce the currently available experimental data adequately. We propose a new approach to developing a physically based model of the continuum. It is demonstrated that water dimers and wings of monomer lines may contribute equally to the continuum within the bands, and their contribution should be taken into account in the continuum model. We propose a physical mechanism giving missing justification for the super-Lorentzian behavior of the intermediate line wing. The qualitative validation of the proposed approach is given on the basis of a simple empirical model. The obtained results are directly indicative of the necessity to reconsider the existing line wing theory and can guide this consideration.

Healthy eating for life: rationale and development of an English as a second language (ESL) curriculum for promoting healthy nutrition.

PubMed

Martinez, Josefa L; Rivers, Susan E; Duncan, Lindsay R; Bertoli, Michelle; Domingo, Samantha; Latimer-Cheung, Amy E; Salovey, Peter

2013-12-01

Low health literacy contributes significantly to cancer health disparities disadvantaging minorities and the medically underserved. Immigrants to the United States constitute a particularly vulnerable subgroup of the medically underserved, and because many are non-native English speakers, they are pre-disposed to encounter language and literacy barriers across the cancer continuum. Healthy Eating for Life (HE4L) is an English as a second language (ESL) curriculum designed to teach English language and health literacy while promoting fruit and vegetable consumption for cancer prevention. This article describes the rationale, design, and content of HE4L. HE4L is a content-based adult ESL curriculum grounded in the health action process approach to behavior change. The curriculum package includes a soap opera-like storyline, an interactive student workbook, a teacher's manual, and audio files. HE4L is the first teacher-administered, multimedia nutrition-education curriculum designed to reduce cancer risk among beginning-level ESL students. HE4L is unique because it combines adult ESL principles, health education content, and behavioral theory. HE4L provides a case study of how evidence-based, health promotion practices can be implemented into real-life settings and serves as a timely, useful, and accessible nutrition-education resource for health educators.

Teaching science in museums: The pedagogy and goals of museum educators

NASA Astrophysics Data System (ADS)

Tran, Lynn Uyen

2007-03-01

Museum educators have a longstanding presence in museums and play a significant role in the institutions' educational agenda. However, research on field trips to science museums has predominantly explored teachers' and students' perspectives with little acknowledgment of the museum educators who develop and implement the educational programs the students experience. This study sought to describe instruction undertaken in, and goals driving, science museums' lessons through observations of museum educators followed by conversations with them immediately afterwards. Findings showed the ways in which educators adapted their preplanned lessons to the students' interests, needs, and understanding by manipulating the sequence and timing. The data revealed that, contrary to depictions in the research literature of teaching in museums as didactic and lecture oriented, there was creativity, complexity, and skills involved in teaching science in museums. Finally, the educators' teaching actions were predominantly influenced by their affective goals to nurture interests in science and learning. Although their lessons were ephemeral experiences, these educators operated from a perspective, which regarded a school field trip to the science museum, not as a one-time event, but as part of a continuum of visiting such institutions well beyond school and childhood. These findings have implications for the pedagogical practices employed by museum educators, and the relationship between teachers and educators during school field trips, which are discussed.

Beyond R & D: Market Impact, Continuum Magazine, Summer 2016 / Issue 9

DOE Office of Scientific and Technical Information (OSTI.GOV)

2016-07-01

This issue of NREL's Continuum Magazine covers the depth and breadth of the laboratory's work to bridge scientific discovery and market adoption by helping technologies move from research through development, demonstration, and deployment.

Micropolar continuum modelling of bi-dimensional tetrachiral lattices

PubMed Central

Chen, Y.; Liu, X. N.; Hu, G. K.; Sun, Q. P.; Zheng, Q. S.

2014-01-01

The in-plane behaviour of tetrachiral lattices should be characterized by bi-dimensional orthotropic material owing to the existence of two orthogonal axes of rotational symmetry. Moreover, the constitutive model must also represent the chirality inherent in the lattices. To this end, a bi-dimensional orthotropic chiral micropolar model is developed based on the theory of irreducible orthogonal tensor decomposition. The obtained constitutive tensors display a hierarchy structure depending on the symmetry of the underlying microstructure. Eight additional material constants, in addition to five for the hemitropic case, are introduced to characterize the anisotropy under Z2 invariance. The developed continuum model is then applied to a tetrachiral lattice, and the material constants of the continuum model are analytically derived by a homogenization process. By comparing with numerical simulations for the discrete lattice, it is found that the proposed continuum model can correctly characterize the static and wave properties of the tetrachiral lattice. PMID:24808754

A Continuum Method for Determining Membrane Protein Insertion Energies and the Problem of Charged Residues

PubMed Central

Choe, Seungho; Hecht, Karen A.; Grabe, Michael

2008-01-01

Continuum electrostatic approaches have been extremely successful at describing the charged nature of soluble proteins and how they interact with binding partners. However, it is unclear whether continuum methods can be used to quantitatively understand the energetics of membrane protein insertion and stability. Recent translation experiments suggest that the energy required to insert charged peptides into membranes is much smaller than predicted by present continuum theories. Atomistic simulations have pointed to bilayer inhomogeneity and membrane deformation around buried charged groups as two critical features that are neglected in simpler models. Here, we develop a fully continuum method that circumvents both of these shortcomings by using elasticity theory to determine the shape of the deformed membrane and then subsequently uses this shape to carry out continuum electrostatics calculations. Our method does an excellent job of quantitatively matching results from detailed molecular dynamics simulations at a tiny fraction of the computational cost. We expect that this method will be ideal for studying large membrane protein complexes. PMID:18474636

A sensitive continuum analysis method for gamma ray spectra

NASA Technical Reports Server (NTRS)

Thakur, Alakh N.; Arnold, James R.

1993-01-01

In this work we examine ways to improve the sensitivity of the analysis procedure for gamma ray spectra with respect to small differences in the continuum (Compton) spectra. The method developed is applied to analyze gamma ray spectra obtained from planetary mapping by the Mars Observer spacecraft launched in September 1992. Calculated Mars simulation spectra and actual thick target bombardment spectra have been taken as test cases. The principle of the method rests on the extraction of continuum information from Fourier transforms of the spectra. We study how a better estimate of the spectrum from larger regions of the Mars surface will improve the analysis for smaller regions with poorer statistics. Estimation of signal within the continuum is done in the frequency domain which enables efficient and sensitive discrimination of subtle differences between two spectra. The process is compared to other methods for the extraction of information from the continuum. Finally we explore briefly the possible uses of this technique in other applications of continuum spectra.

Three Southern high school biology teachers' perspectives on teaching evolution: Sociocultural influences

NASA Astrophysics Data System (ADS)

Kyzer, Peggy Mckewen

Organizations in science and science education call for students to have a thorough understanding of the theory of evolution. Yet many high school biology teachers do not teach evolution and/or include creationism in their instruction (National Academy of Science, 1998). Historically, the controversy surrounding evolution has created tension for teachers. This case study explored the sociocultural influences related to teaching evolution in three Southern 10th-grade public high school biology classrooms. It also explored the socially and culturally embedded influences on teachers' instructional goals and personal perspectives toward evolution as well as modification of instruction when evolution is taught. Theoretically framed using symbolic interactionism and sociocultural theory, data were collected between October 2003 and April 2004 and included classroom observations two to three times per week, artifacts, and in-depth interviews of the participating teachers, their science department chairpersons, their students, and a Protestant minister. The classroom teachers were unaware of the focus of the study until after evolution was taught. The analysis used in this study was an inductive, interpretative approach that allowed exploration of the sociocultural influences that affect how teachers teach evolution. The sociocultural influences and the lived experiences of each teacher created a continuum for teaching evolution. One of the participating teachers who was heavily involved in the community and one of its fundamentalist churches elected to avoid teaching evolution. Another participating teacher at the same school integrated the theory of evolution in every unit. The third teacher who taught in another school elected to teach evolution in a superficial manner to avoid conflict. The data revealed that the participating teachers' sociocultural situatedness influenced their decisions and instruction on evolution. The influence of strong religious beliefs within the Southern culture was a theme that cut across all the teachers' decisions. In particular, religious beliefs made teaching human evolution difficult. Other recurring themes included the influence of the textbook and factors that served as escape routes for the teachers electing to avoid evolution. The escape routes included the pressure of time, the mixed messages from the state board of education, and the double-edged sword of teacher autonomy.

Numerical simulation of freshwater/seawater interaction in a dual-permeability karst system with conduits: the development of discrete-continuum VDFST-CFP model

NASA Astrophysics Data System (ADS)

Xu, Zexuan; Hu, Bill

2016-04-01

Dual-permeability karst aquifers of porous media and conduit networks with significant different hydrological characteristics are widely distributed in the world. Discrete-continuum numerical models, such as MODFLOW-CFP and CFPv2, have been verified as appropriate approaches to simulate groundwater flow and solute transport in numerical modeling of karst hydrogeology. On the other hand, seawater intrusion associated with fresh groundwater resources contamination has been observed and investigated in numbers of coastal aquifers, especially under conditions of sea level rise. Density-dependent numerical models including SEAWAT are able to quantitatively evaluate the seawater/freshwater interaction processes. A numerical model of variable-density flow and solute transport - conduit flow process (VDFST-CFP) is developed to provide a better description of seawater intrusion and submarine groundwater discharge in a coastal karst aquifer with conduits. The coupling discrete-continuum VDFST-CFP model applies Darcy-Weisbach equation to simulate non-laminar groundwater flow in the conduit system in which is conceptualized and discretized as pipes, while Darcy equation is still used in continuum porous media. Density-dependent groundwater flow and solute transport equations with appropriate density terms in both conduit and porous media systems are derived and numerically solved using standard finite difference method with an implicit iteration procedure. Synthetic horizontal and vertical benchmarks are created to validate the newly developed VDFST-CFP model by comparing with other numerical models such as variable density SEAWAT, couplings of constant density groundwater flow and solute transport MODFLOW/MT3DMS and discrete-continuum CFPv2/UMT3D models. VDFST-CFP model improves the simulation of density dependent seawater/freshwater mixing processes and exchanges between conduit and matrix. Continuum numerical models greatly overestimated the flow rate under turbulent flow condition but discrete-continuum models provide more accurate results. Parameters sensitivities analysis indicates that conduit diameter and friction factor, matrix hydraulic conductivity and porosity are important parameters that significantly affect variable-density flow and solute transport simulation. The pros and cons of model assumptions, conceptual simplifications and numerical techniques in VDFST-CFP are discussed. In general, the development of VDFST-CFP model is an innovation in numerical modeling methodology and could be applied to quantitatively evaluate the seawater/freshwater interaction in coastal karst aquifers. Keywords: Discrete-continuum numerical model; Variable density flow and transport; Coastal karst aquifer; Non-laminar flow

Modes of interconnected lattice trusses using continuum models, part 1

NASA Technical Reports Server (NTRS)

Balakrishnan, A. V.

1991-01-01

This represents a continuing systematic attempt to explore the use of continuum models--in contrast to the Finite Element Models currently universally in use--to develop feedback control laws for stability enhancement of structures, particularly large structures, for deployment in space. We shall show that for the control objective, continuum models do offer unique advantages. It must be admitted of course that developing continuum models for arbitrary structures is no easy task. In this paper we take advantage of the special nature of current Large Space Structures--typified by the NASA-LaRC Evolutionary Model which will be our main concern--which consists of interconnected orthogonal lattice trusses each with identical bays. Using an equivalent one-dimensional Timoshenko beam model, we develop an almost complete continuum model for the evolutionary structure. We do this in stages, beginning only with the main bus as flexible and then going on to make all the appendages also flexible-except for the antenna structure. Based on these models we proceed to develop formulas for mode frequencies and shapes. These are shown to be the roots of the determinant of a matrix of small dimension compared with mode calculations using Finite Element Models, even though the matrix involves transcendental functions. The formulas allow us to study asymptotic properties of the modes and how they evolve as we increase the number of bodies which are treated as flexible. The asymptotics, in fact, become simpler.

Validation Evidence of the Motivation for Teaching Scale in Secondary Education.

PubMed

Abós, Ángel; Sevil, Javier; Martín-Albo, José; Aibar, Alberto; García-González, Luis

2018-04-10

Grounded in self-determination theory, the aim of this study was to develop a scale with adequate psychometric properties to assess motivation for teaching and to explain some outcomes of secondary education teachers at work. The sample comprised 584 secondary education teachers. Analyses supported the five-factor model (intrinsic motivation, identified regulation, introjected regulation, external regulation and amotivation) and indicated the presence of a continuum of self-determination. Evidence of reliability was provided by Cronbach's alpha, composite reliability and average variance extracted. Multigroup confirmatory factor analyses supported the partial invariance (configural and metric) of the scale in different sub-samples, in terms of gender and type of school. Concurrent validity was analyzed by a structural equation modeling that explained 71% of the work dedication variance and 69% of the boredom at work variance. Work dedication was positively predicted by intrinsic motivation (ß = .56, p < .001) and external regulation (ß = .29, p < .001) and negatively predicted by introjected regulation (ß = -.22, p < .001) and amotivation (ß = -.49, p < .001). Boredom at work was negatively predicted by intrinsic motivation (ß = -.28, p < .005) and positively predicted by amotivation (ß = .68, p < .001). The Motivation for Teaching Scale in Secondary Education (Spanish acronym EME-ES, Escala de Motivación por la Enseñanza en Educación Secundaria) is discussed as a valid and reliable instrument. This is the first specific scale in the work context of secondary teachers that has integrated the five-factor structure together with their dedication and boredom at work.

Developing Mainstream Resource Provision for Pupils with Autism Spectrum Disorder: Staff Perceptions and Satisfaction

ERIC Educational Resources Information Center

Bond, Caroline; Hebron, Judith

2016-01-01

The majority of children and young people with autism spectrum disorder are educated in mainstream schools. The diverse needs of this group of pupils has led to a continuum of provision being promoted in the UK and other countries, and developed at a local level. This continuum includes mainstream schools with resource provision which can offer…

Polarizable Molecular Dynamics in a Polarizable Continuum Solvent

PubMed Central

Lipparini, Filippo; Lagardère, Louis; Raynaud, Christophe; Stamm, Benjamin; Cancès, Eric; Mennucci, Benedetta; Schnieders, Michael; Ren, Pengyu; Maday, Yvon; Piquemal, Jean-Philip

2015-01-01

We present for the first time scalable polarizable molecular dynamics (MD) simulations within a polarizable continuum solvent with molecular shape cavities and exact solution of the mutual polarization. The key ingredients are a very efficient algorithm for solving the equations associated with the polarizable continuum, in particular, the domain decomposition Conductor-like Screening Model (ddCOSMO), a rigorous coupling of the continuum with the polarizable force field achieved through a robust variational formulation and an effective strategy to solve the coupled equations. The coupling of ddCOSMO with non variational force fields, including AMOEBA, is also addressed. The MD simulations are feasible, for real life systems, on standard cluster nodes; a scalable parallel implementation allows for further speed up in the context of a newly developed module in Tinker, named Tinker-HP. NVE simulations are stable and long term energy conservation can be achieved. This paper is focused on the methodological developments, on the analysis of the algorithm and on the stability of the simulations; a proof-of-concept application is also presented to attest the possibilities of this newly developed technique. PMID:26516318

Hampshire College Center for Science Education. Final Report on Activities Supported by the Department of Energy Grant No. DE-FG02-06ER64256

DOE Office of Scientific and Technical Information (OSTI.GOV)

Stillings, Neil; Wenk, Laura

Hampshire College's Center for Science Education (Center) focuses on teacher professional development, curriculum development, and student enrichment programs. The Center also maintains research programs on teacher change, student learning and instructional effectiveness. The Center's work promotes learning that persists over time and transfers to new situations in and out of school. The projects develop the implications of the increasing agreement among teachers and researchers that effective learning involves active concept mastery and consistent practice with inquiry and critical thinking. The Center's objective is to help strengthen the pipeline of U.S. students pursuing postsecondary study in STEM fields. The Center achievesmore » this by fostering an educational environment in which science is taught as an active, directly experienced endeavor across the K-16 continuum. Too often, young people are dissuaded from pursuing science because they do not see its relevance, instead experiencing it as dry, rote, technical. In contrast, when science is taught as a hands-on, inquiry-driven process, students are encouraged to ask questions grounded in their own curiosity and seek experimental solutions accordingly. In this way, they quickly discover both the profound relevance of science to their daily lives and its accessibility to them. Essentially, they learn to think and act like real scientists. The Center’s approach is multi-faceted: it includes direct inquiry-based science instruction to secondary and postsecondary students, educating the next generation of teachers, and providing new educational opportunities for teachers already working in the schools. Funding from the Department of Energy focused on the last population, enabling in-service teachers to explore and experience the pedagogy of inquiry-based science for themselves, and to take it back to their classrooms and students. The Center has demonstrated that the inquiry-based approach to science learning is compatible with existing state curriculum frameworks and produces students who understand and are positively inclined toward science. Funds from this Department of Energy grant supported three projects that involved K-16 science outreach: 1. Teaching Issues and Experiments in Ecology (TIEE). TIEE a peer-reviewed online journal and curriculum resource for postsecondary science teachers. 2. The Collaboration for Excellence in Science Education (CESE). CESE is a partnership with the Amherst, Massachusetts school system to foster the professional development of science teachers, and to perform research on student learning in the sciences and on teacher change. The project draws on Hampshire's long experience with inquiry-oriented and interdisciplinary education, as well as on its unique strengths in cognitive science. The project is run as design research, working with teachers to improve their practices and studying student and/or teacher outcomes. 3. Day in the Lab. Grant funds partially supported the expansion of the ongoing science outreach activities of the School of Natural Science. These activities are focused on local districts with large minority enrollments, including the Amherst, Holyoke and Springfield Public School Districts, and the Pioneer Valley Performing Arts Charter School (PVPA). Each of the three projects supported by the grant met or exceeded its goals. In part, the successes we met were due to continuity and communication among the staff of the programs. At the beginning of the CESE project, a science outreach coordinator was recruited. He worked throughout the grant period along with a senior researcher and the project's curriculum director. Additionally, the director and an undergraduate student conducted research on teacher change. The science outreach coordinator acted as a liaison among Hampshire College, the school districts, and a number of local businesses and agencies, providing organizational support, discussion facilitation, classroom support for teachers, and materials purchase. His presence in the schools kept teachers engaged and supported. He also brought the PVPA Charter School into the project. He worked closely with the educational outreach coordinator at Hampshire who oversaw the Day in the Lab program. Together, they have ensured the continuity of support to the schools through the use and placement of student interns. Finally, the director and coordinators worked with the Hitchock Center for the Environment to bring the two science professional development efforts in Amherst together. The joint development of workshops for elementary teachers was extremely successful. A major reason for the successes of the CESE program was the strength of the teacher outreach team and the sheer number of hours spent building relationships, talking about teaching and learning, planning projects, developing curriculum, and working with experts throughout the Pioneer Valley.« less

Behavior change in a student with a dual diagnosis of deafness and pervasive developmental disorder: a case study.

PubMed

Easterbrooks, Susan R; Handley, C Michele

The broad term pervasive developmental disorder (PPD) describes a set of symptoms that occur along a continuum of severity; these symptoms are often referred to as autism spectrum disorders (ASDs). Little is known about the incidence and prevalence of ASDs among students who are deaf or hard of hearing (DHH). Teachers of DHH students, who must work with individuals with dual diagnoses, are at a loss for guidance from the literature. The authors review the literature on ASDs (also referred to as PDD) within the DHH population, provide results of a single-subject study to reduce PDD-type behaviors in a child with hearing loss, and argue that teachers of students who are DHH must learn about practices associated with applied behavior analysis as an tool for intervening therapeutically with children with dual diagnoses of hearing loss plus an ASD.

Realistic Gamow shell model for resonance and continuum in atomic nuclei

NASA Astrophysics Data System (ADS)

Xu, F. R.; Sun, Z. H.; Wu, Q.; Hu, B. S.; Dai, S. J.

2018-02-01

The Gamow shell model can describe resonance and continuum for atomic nuclei. The model is established in the complex-moment (complex-k) plane of the Berggren coordinates in which bound, resonant and continuum states are treated on equal footing self-consistently. In the present work, the realistic nuclear force, CD Bonn, has been used. We have developed the full \\hat{Q}-box folded-diagram method to derive the realistic effective interaction in the model space which is nondegenerate and contains resonance and continuum channels. The CD-Bonn potential is renormalized using the V low-k method. With choosing 16O as the inert core, we have applied the Gamow shell model to oxygen isotopes.

The future nephrology workforce: will there be one?

PubMed

Parker, Mark G; Ibrahim, Tod; Shaffer, Rachel; Rosner, Mitchell H; Molitoris, Bruce A

2011-06-01

Interest in nephrology as a career is declining and has been on the decline for nearly one decade. From 2002 to 2009, all internal medicine subspecialties except geriatric medicine increased the number of available fellowship positions. However, only two subspecialties attracted fewer United States medical graduates (USMGs) in 2009 than in 2002: geriatric medicine and nephrology. This drop occurred at a time when demand for nephrologists is increasing and when the specialty is having a harder time benefiting from the substantial contribution of international medical graduates (IMGs). Today's USMGs possess fundamentally different career and personal goals from their teachers and mentors. Medical students report receiving minimal exposure to nephrology in clinical rotations, and they perceive that the specialty is too complex, uninteresting, and lacks professional opportunity. Meanwhile, the demographics of kidney disease in the United States, as well as recent national health policy developments, indicate a growing need for nephrologists. Efforts to improve the educational continuum in nephrology and enhance mentorship are essential to restoring interest in nephrology for USMGs, maintaining its appeal among IMGs, and developing a workforce sufficient to meet future demand for renal care.

First Science Verification of the VLA Sky Survey Pilot

NASA Astrophysics Data System (ADS)

Cavanaugh, Amy

2017-01-01

My research involved analyzing test images by Steve Myers for the upcoming VLA Sky Survey. This survey will cover the entire sky visible from the VLA site in S band (2-4 GHz). The VLA will be in B configuration for the survey, as it was when the test images were produced, meaning a resolution of approximately 2.5 arcseconds. Conducted using On-the-Fly mode, the survey will have a speed of approximately 20 deg2 hr-1 (including overhead). New Python imaging scripts are being developed and improved to process the VLASS images. My research consisted of comparing a continuum test image over S band (from the new imaging scripts) to two previous images of the same region of the sky (from the CNSS and FIRST surveys), as well as comparing the continuum image to single spectral windows (from the new imaging scripts and of the same sky region). By comparing our continuum test image to images from CNSS and FIRST, we tested on-the-Fly mode and the imaging script used to produce our images. Another goal was to test whether individual spectral windows could be used in combination to calculate spectral indices close to those produced over S band (based only on our continuum image). Our continuum image contained 64 sources as opposed to the 99 sources found in the CNSS image. The CNSS image also had lower noise level (0.095 mJy/beam compared to 0.119 mJy/beam). Additionally, when our continuum image was compared to the CNSS image, separation showed no dependence on total flux density (in our continuum image). At lower flux densities, sources in our image were brighter than the same ones in the CNSS image. When our continuum image was compared to the FIRST catalog, the spectral index difference showed no dependence on total flux (in our continuum image). In conclusion, the quality of our images did not completely match the quality of the CNSS and FIRST images. More work is needed in developing the new imaging scripts.

A CONTINUUM HARD-SPHERE MODEL OF PROTEIN ADSORPTION

PubMed Central

Finch, Craig; Clarke, Thomas; Hickman, James J.

2012-01-01

Protein adsorption plays a significant role in biological phenomena such as cell-surface interactions and the coagulation of blood. Two-dimensional random sequential adsorption (RSA) models are widely used to model the adsorption of proteins on solid surfaces. Continuum equations have been developed so that the results of RSA simulations can be used to predict the kinetics of adsorption. Recently, Brownian dynamics simulations have become popular for modeling protein adsorption. In this work a continuum model was developed to allow the results from a Brownian dynamics simulation to be used as the boundary condition in a computational fluid dynamics (CFD) simulation. Brownian dynamics simulations were used to model the diffusive transport of hard-sphere particles in a liquid and the adsorption of the particles onto a solid surface. The configuration of the adsorbed particles was analyzed to quantify the chemical potential near the surface, which was found to be a function of the distance from the surface and the fractional surface coverage. The near-surface chemical potential was used to derive a continuum model of adsorption that incorporates the results from the Brownian dynamics simulations. The equations of the continuum model were discretized and coupled to a CFD simulation of diffusive transport to the surface. The kinetics of adsorption predicted by the continuum model closely matched the results from the Brownian dynamics simulation. This new model allows the results from mesoscale simulations to be incorporated into micro- or macro-scale CFD transport simulations of protein adsorption in practical devices. PMID:23729843

Patients' experiences with continuum of care across hospitals. A multilevel analysis of Consumer Quality Index Continuum of Care.

PubMed

Kollen, Boudewijn J; Groenier, Klaas H; Berendsen, Annette J

2011-05-01

Communication between professionals is essential because it contributes to an optimal continuum of care. Whether patients experience adequate continuum of care is uncertain. To address this, a questionnaire was developed to elucidate this care process from a patients' perspective. In this study, the instrument's ability to measure differences in "Consumer Quality Index Continuum of Care" scores between hospitals was investigated. The questionnaire was mailed to a random sample of 2159 patients and comprised of 22 items divided over four domains, GP approach, GP referral, specialist and collaboration. Multilevel analysis was conducted to identify case-mix and determine this questionnaire's ability to measure differences in domain scores between hospitals. Based on a 65% response rate, 1404 questionnaires were available for analysis. Case-mix of patient characteristics across hospitals could not be demonstrated. Some differences in scores between hospitals were observed. At most two in eight hospitals showed different domain scores. The ability of this questionnaire to measure differences in continuum of care scores between hospitals is limited. The outcome of this survey suggests that hospitals provide a similar level of continuum of care from a patient's perspective. This questionnaire is especially useful for measuring differences between patients. Copyright © 2010 Elsevier Ireland Ltd. All rights reserved.

Theory to practice: A study of science teachers' pedagogical practices as measured by the Science Teacher Analysis Matrix (STAM) and Teacher Pedagogical Philosophy Interview (TPPI)

NASA Astrophysics Data System (ADS)

Brown, Sherri Lynne

This study continued research previously conducted by a nine-university collaborative, the Salish I Research Project, by exploring science teachers' beliefs and actions with regard to inquiry instruction. Science education reform efforts require that students learn science via inquiry. The purpose of this study was to determine and classify espoused teaching beliefs and observable teaching style. Reported are linkages between the teachers' beliefs and styles, influential coursework from College of Education and College of Liberal Arts, and outcomes of increased classroom experience. Eight participants were chosen from three separate preservice science education cohorts. Inquiry efforts require a student-centered environment as opposed to the traditional teacher-centered environment. According to the 1997 Salish I Research Collaborative, beginning teachers displayed a stark contrast between their student centered beliefs to their teacher-centered actions. The limitations of this study were as follows: (1) the participants had completed the authentic research-based inquiry science course, Knowing and Teaching Science: Just Do It; (2) the participants were currently teaching science at the secondary level; (3) the selected instruments were used in the Salish I Research Collaborative Study, and (4) instrument validity and reliability data were not available. Interview data from the Teacher Pedagogical Philosophy Interview (TPPI) instrument and observational data from the Secondary Science Teacher Analysis Matrix (STAM) instrument were statistically compiled via concept maps and matrices. Data were then represented on an ordinal scale. Interview results indicated that 87.5% of the participants professed a teacher-centered style with regard to teacher and student's actions. Observational results indicated that 56% of the participants displayed a teacher-centered style with regard to content, teacher's actions, student's actions, resources, and environment. Additionally, 36% of the participants displayed a conceptual style, which has characteristics of both teacher and student-centered domains. Linkages between the interview and observational data were unexpected due to the fact that participants professed a slightly greater teacher-centered style along the inquiry instruction continuum than what they actually practiced. This study reported congruity between what the participants believed and what they practiced. A negligible change regarding inquiry beliefs and instruction was discovered among the three cohorts as years of teaching experience increased.

Modeling of Continuum Manipulators Using Pythagorean Hodograph Curves.

PubMed

Singh, Inderjeet; Amara, Yacine; Melingui, Achille; Mani Pathak, Pushparaj; Merzouki, Rochdi

2018-05-10

Research on continuum manipulators is increasingly developing in the context of bionic robotics because of their many advantages over conventional rigid manipulators. Due to their soft structure, they have inherent flexibility, which makes it a huge challenge to control them with high performances. Before elaborating a control strategy of such robots, it is essential to reconstruct first the behavior of the robot through development of an approximate behavioral model. This can be kinematic or dynamic depending on the conditions of operation of the robot itself. Kinematically, two types of modeling methods exist to describe the robot behavior; quantitative methods describe a model-based method, and qualitative methods describe a learning-based method. In kinematic modeling of continuum manipulator, the assumption of constant curvature is often considered to simplify the model formulation. In this work, a quantitative modeling method is proposed, based on the Pythagorean hodograph (PH) curves. The aim is to obtain a three-dimensional reconstruction of the shape of the continuum manipulator with variable curvature, allowing the calculation of its inverse kinematic model (IKM). It is noticed that the performances of the PH-based kinematic modeling of continuum manipulators are considerable regarding position accuracy, shape reconstruction, and time/cost of the model calculation, than other kinematic modeling methods, for two cases: free load manipulation and variable load manipulation. This modeling method is applied to the compact bionic handling assistant (CBHA) manipulator for validation. The results are compared with other IKMs developed in case of CBHA manipulator.

The thesis of stages fourteen years later

NASA Astrophysics Data System (ADS)

Beeby, C. E.

1980-12-01

The author indicates the changes and additions he would make to his book ` The Quality of Education in Developing Countries' (1966) if he were re-writing it in 1980. He would make clearer that his primary interest is in a continuum of change, the process of growth of a school system, and that the `stages' are only a convenient non-mathematical artifact to make the thesis more useful to administrators and planners. In the light of more recent developments and experiences, he now gives new stress to the pluralism of objectives at the stage of Meaning, and discusses the political, social, cultural and financial reasons why a country may choose not to take the difficult step from stage III to stage IV. Recent forms of alternative education, particularly those embodying plans for lifelong education, offer some hope of bypassing his thesis of stages. More consideration is given to constraints other than that of teacher qualification, though the difficulty of changing the skills, habits, attitudes and purposes in the teaching profession remain the chief obstacle to qualitative growth. Particular attention is paid to `crash' programmes where processes that are, by their very nature, successive are compressed into simultaneous or almost simultaneous ones. Some implications of the thesis of stages for teacher training are briefly dealt with. Regarding the application of the thesis to secondary education, he maintains that a better model of growth would be one based on the capacity of secondary education to respond to the changing economic and social demands of the community. Finally, he suggests three methods of testing his hypotheses and pleads that more consideration be given to building up a body of educational, theory based on the experience of developing countries over the past three decades.

Early Academic Skills and Childhood Experiences across the Urban-Rural Continuum

ERIC Educational Resources Information Center

Miller, Portia; Votruba-Drzal, Elizabeth

2013-01-01

The urban-rural continuum provides unique contexts for development. Differences in access to resources and childrearing norms and practices in urban, suburban, and rural areas may be linked to disparities in early achievement. Yet, few studies examine associations between urbanicity and children's early academic skills. Using nationally…

Continuum modes of nonlocal field theories

NASA Astrophysics Data System (ADS)

Saravani, Mehdi

2018-04-01

We study a class of nonlocal Lorentzian quantum field theories, where the d’Alembertian operator \\Box is replaced by a non-analytic function of the d’Alembertian, f(\\Box) . This is inspired by the causal set program where such an evolution arises as the continuum limit of a wave equation on causal sets. The spectrum of these theories contains a continuum of massive excitations. This is perhaps the most important feature which leads to distinct/interesting phenomenology. In this paper, we study properties of the continuum massive modes in depth. We derive the path integral formulation of these theories. Meanwhile, this derivation introduces a dual picture in terms of local fields which clearly shows how continuum massive modes of the nonlocal field interact. As an example, we calculate the leading order modification to the Casimir force of a pair of parallel planes. The dual picture formulation opens the way for future developments in the study of nonlocal field theories using tools already available in local quantum field theories.

Discrete-to-continuum modelling of weakly interacting incommensurate two-dimensional lattices.

PubMed

Español, Malena I; Golovaty, Dmitry; Wilber, J Patrick

2018-01-01

In this paper, we derive a continuum variational model for a two-dimensional deformable lattice of atoms interacting with a two-dimensional rigid lattice. The starting point is a discrete atomistic model for the two lattices which are assumed to have slightly different lattice parameters and, possibly, a small relative rotation. This is a prototypical example of a three-dimensional system consisting of a graphene sheet suspended over a substrate. We use a discrete-to-continuum procedure to obtain the continuum model which recovers both qualitatively and quantitatively the behaviour observed in the corresponding discrete model. The continuum model predicts that the deformable lattice develops a network of domain walls characterized by large shearing, stretching and bending deformation that accommodates the misalignment and/or mismatch between the deformable and rigid lattices. Two integer-valued parameters, which can be identified with the components of a Burgers vector, describe the mismatch between the lattices and determine the geometry and the details of the deformation associated with the domain walls.

Moving Contact Lines: Linking Molecular Dynamics and Continuum-Scale Modeling.

PubMed

Smith, Edward R; Theodorakis, Panagiotis E; Craster, Richard V; Matar, Omar K

2018-05-17

Despite decades of research, the modeling of moving contact lines has remained a formidable challenge in fluid dynamics whose resolution will impact numerous industrial, biological, and daily life applications. On the one hand, molecular dynamics (MD) simulation has the ability to provide unique insight into the microscopic details that determine the dynamic behavior of the contact line, which is not possible with either continuum-scale simulations or experiments. On the other hand, continuum-based models provide a link to the macroscopic description of the system. In this Feature Article, we explore the complex range of physical factors, including the presence of surfactants, which governs the contact line motion through MD simulations. We also discuss links between continuum- and molecular-scale modeling and highlight the opportunities for future developments in this area.

Development and application of novel SNP-based serotyping assays in targeting Salmonella enterica within the poultry production and processing continuum.

USDA-ARS?s Scientific Manuscript database

Salmonella enterica subsp. enterica serotype Enteriditis (S. Enteriditis) is the leading cause of salmonellosis worldwide. While some S. enterica serotypes are specific to birds, many represent human zoonotic pathogens, thus their presence and survival throughout the continuum of poultry production...

Beyond R&D: Market Impact - Continuum Magazine | NREL

Science.gov Websites

Spring 2016 / Issue 9 Continuum. Clean Energy Innovation at NREL Beyond R&D: Market Impact technologies move from research through development, demonstration, and deployment. Photo of two long cabins with a view of one roof, which is covered with solar panels. In the background are forest-covered

The May Center for Early Childhood Education: Description of a Continuum of Services Model for Children with Autism.

ERIC Educational Resources Information Center

Campbell, Susan; Cannon, Barbara; Ellis, James T.; Lifter, Karen; Luiselli, James K.; Navalta, Carryl P.; Taras, Marie

1998-01-01

Describes a comprehensive continuum of services model for children with autism developed by a human services agency in Massachusetts, which incorporates these and additional empirically based approaches. Service components, methodologies, and program objectives are described, including representative summary data. Best practice approaches toward…

Self-Assessment Exercises in Continuum Mechanics with Autonomous Learning

ERIC Educational Resources Information Center

Marcé-Nogué, Jordi; Gil, LLuís; Pérez, Marco A.; Sánchez, Montserrat

2013-01-01

The main objective of this work is to generate a set of exercises to improve the autonomous learning in "Continuum Mechanics" through a virtual platform. Students will have to resolve four exercises autonomously related to the subject developed in class and they will post the solutions on the virtual platform within a deadline. Students…

AEROELASTIC SIMULATION TOOL FOR INFLATABLE BALLUTE AEROCAPTURE

NASA Technical Reports Server (NTRS)

Liever, P. A.; Sheta, E. F.; Habchi, S. D.

2006-01-01

A multidisciplinary analysis tool is under development for predicting the impact of aeroelastic effects on the functionality of inflatable ballute aeroassist vehicles in both the continuum and rarefied flow regimes. High-fidelity modules for continuum and rarefied aerodynamics, structural dynamics, heat transfer, and computational grid deformation are coupled in an integrated multi-physics, multi-disciplinary computing environment. This flexible and extensible approach allows the integration of state-of-the-art, stand-alone NASA and industry leading continuum and rarefied flow solvers and structural analysis codes into a computing environment in which the modules can run concurrently with synchronized data transfer. Coupled fluid-structure continuum flow demonstrations were conducted on a clamped ballute configuration. The feasibility of implementing a DSMC flow solver in the simulation framework was demonstrated, and loosely coupled rarefied flow aeroelastic demonstrations were performed. A NASA and industry technology survey identified CFD, DSMC and structural analysis codes capable of modeling non-linear shape and material response of thin-film inflated aeroshells. The simulation technology will find direct and immediate applications with NASA and industry in ongoing aerocapture technology development programs.

Elucidating elementary science teachers' conceptions of the nature of science: A view to beliefs about both science and teaching

NASA Astrophysics Data System (ADS)

Keske, Kristina Palmer

The purpose of this interpretive case study was to elucidate the conceptions of the nature of science held by seven elementary science teachers. The constructivist paradigm provided the philosophical and methodological foundation for the study. Interviews were employed to collect data from the participants about their formal and informal experiences with science. In addition, the participants contributed their perspectives on four aspects of the nature of science: what is science; who is a scientist; what are the methods of science; and how is scientific knowledge constructed. Data analysis not only revealed these teachers' views of science, but also provided insights into how they viewed science teaching. Four themes emerged from the data. The first theme developed around the participants' portrayals of the content of science, with participant views falling on a continuum of limited to universal application of science as procedure. The second theme dealt with the participants' views of the absolute nature of scientific knowledge. Participants' perceptions of the tentative nature of science teaching provided the basis for the third theme concerning the need for absolutes in practice. The fourth theme drew parallels between participants' views of science and science teaching, with two participants demonstrating a consistency in beliefs about knowledge construction across contexts. This study revealed both personal and contextual factors which impacted how the participants saw science and science teaching. Many of the participants' memories of formal science revolved around the memorization of content and were viewed negatively. All the participants had limited formal training in science. Of the seven participants, only two had chosen to be science teachers at the beginning of their careers. The participants' limited formal experiences with science provided little time for exploration into historical, philosophical, and sociological studies of science, a necessary requirement for understanding the scientific enterprise. This study also offered support for the elucidation of teachers' conceptions of the nature of science through in-depth conversations rather than convergent types of assessment. Data analysis of participant responses to isolated aspects of the nature of science yielded incomplete or inconsistent pictures of how the participants saw science. A more consistent picture of science emerged as the participants' beliefs about science and knowledge construction merged. This study proposed that all science teachers need to address their beliefs about knowledge construction across contexts.

Progressive failure methodologies for predicting residual strength and life of laminated composites

NASA Technical Reports Server (NTRS)

Harris, Charles E.; Allen, David H.; Obrien, T. Kevin

1991-01-01

Two progressive failure methodologies currently under development by the Mechanics of Materials Branch at NASA Langley Research Center are discussed. The damage tolerance/fail safety methodology developed by O'Brien is an engineering approach to ensuring adequate durability and damage tolerance by treating only delamination onset and the subsequent delamination accumulation through the laminate thickness. The continuum damage model developed by Allen and Harris employs continuum damage laws to predict laminate strength and life. The philosophy, mechanics framework, and current implementation status of each methodology are presented.

Mechanism of asymmetric lineshape broadening in GaAs1-xNx Raman spectra

NASA Astrophysics Data System (ADS)

Mialitsin, Aleksej; Fluegel, Brian; Ptak, Aaron; Mascarenhas, Angelo

2012-07-01

Resonance Raman spectroscopy is used to probe the asymmetric broadening of the LO phonon linewidth in a dilute GaAs1-xNx alloy (x=0.41%). Electronic Raman scattering from a broad continuum is observed that gets enhanced concurrently with the LO phonon linewidth under resonance. The Fano interaction between the LO phonon and the electronic continuum is used to develop a model that satisfactorily explains the origin of the asymmetric LO phonon linewidth broadening in this abnormal alloy as arising due to coupling between the discrete and the continuum configurations.

An atomistic-continuum hybrid simulation of fluid flows over superhydrophobic surfaces

PubMed Central

Li, Qiang; He, Guo-Wei

2009-01-01

Recent experiments have found that slip length could be as large as on the order of 1 μm for fluid flows over superhydrophobic surfaces. Superhydrophobic surfaces can be achieved by patterning roughness on hydrophobic surfaces. In the present paper, an atomistic-continuum hybrid approach is developed to simulate the Couette flows over superhydrophobic surfaces, in which a molecular dynamics simulation is used in a small region near the superhydrophobic surface where the continuum assumption is not valid and the Navier-Stokes equations are used in a large region for bulk flows where the continuum assumption does hold. These two descriptions are coupled using the dynamic coupling model in the overlap region to ensure momentum continuity. The hybrid simulation predicts a superhydrophobic state with large slip lengths, which cannot be obtained by molecular dynamics simulation alone. PMID:19693344

DOE Office of Scientific and Technical Information (OSTI.GOV)

Zimmerman, Jonathan A.; Jones, Reese E.; Templeton, Jeremy Alan

Materials with characteristic structures at nanoscale sizes exhibit significantly different mechani-cal responses from those predicted by conventional, macroscopic continuum theory. For example,nanocrystalline metals display an inverse Hall-Petch effect whereby the strength of the materialdecreases with decreasing grain size. The origin of this effect is believed to be a change in defor-mation mechanisms from dislocation motion across grains and pileup at grain boundaries at mi-croscopic grain sizes to rotation of grains and deformation within grain boundary interface regionsfor nanostructured materials. These rotational defects are represented by the mathematical conceptof disclinations. The ability to capture these effects within continuum theory, thereby connectingnanoscalemore » materials phenomena and macroscale behavior, has eluded the research community.The goal of our project was to develop a consistent theory to model both the evolution ofdisclinations and their kinetics. Additionally, we sought to develop approaches to extract contin-uum mechanical information from nanoscale structure to verify any developed continuum theorythat includes dislocation and disclination behavior. These approaches yield engineering-scale ex-pressions to quantify elastic and inelastic deformation in all varieties of materials, even those thatpossess highly directional bonding within their molecular structures such as liquid crystals, cova-lent ceramics, polymers and biological materials. This level of accuracy is critical for engineeringdesign and thermo-mechanical analysis is performed in micro- and nanosystems. The researchproposed here innovates on how these nanoscale deformation mechanisms should be incorporatedinto a continuum mechanical formulation, and provides the foundation upon which to develop ameans for predicting the performance of advanced engineering materials.4 AcknowledgmentThe authors acknowledge helpful discussions with Farid F. Abraham, Youping Chen, Terry J.Delph, Remi Dingreville, James W. Foulk III, Robert J. Hardy, Richard Lehoucq, Alejandro Mota,Gregory J. Wagner, Edmund B. Webb III and Xiaowang Zhou. Support for this project was pro-vided by the Enabling Predictive Simulation Investment Area of Sandia's Laboratory DirectedResearch and Development (LDRD) program.5« less

Academic Motivation of the First-Year University Students and the Self-Determination Theory

ERIC Educational Resources Information Center

Koseoglu, Yaman

2013-01-01

The Self Determination Theory has identified various types of motivation along a continuum from weakest to strongest. Yet, until recently, no reliable method existed to measure accurately the strength of motivation along this continuum. Vallerand et al. (1992) developed the Academic Motivation Scale (AMS) to measure the validity of the Self…

The Continuum of Literacy in American Indian Communities.

ERIC Educational Resources Information Center

Zepeda, Ofelia

1995-01-01

Describes the O'odham language and oral tradition of the Tohono O'odham Indians of southern Arizona, relating it to the development of O'odham children's English literacy. Oral tradition and school literacy constitute opposite ends of a literacy continuum, in which English literacy is often isolated from and in conflict with O'odham literacy. (10…

Taylor, Graicunas, Worthy, Likert, and Thayer: Span of Control and Organizational Structure--Where They Fit on the "Leadership Continuum."

ERIC Educational Resources Information Center

Corder, Lloyd E.

The "Leadership Continuum" model developed in 1961 by R. Tannenbaum, I. Weschler, and F. Massarik clearly illustrates the ideas that management scholars like Frederick Taylor, V. A. Graicunas, James Worthy, Rensis Likert, and Frederick Thayer have posited concerning span of control and organizational structure. Each of these scholars…

Spiraling down the river continuum: stream ecology and the U-shaped curve

Treesearch

Jackson R. Webster

2007-01-01

The spiraling concept provides an explicit approach to modeling the longitudinal linkages within a river continuum. I developed a spiraling-based model for particulate organic C dynamics in the Little Tennessee River to synthesize existing data and to illustrate our current understanding of ecosystem processes in river ecosystems. The Little Tennessee River is a medium...

Consistent Continuum Particle Modeling of Hypersonic Flows and Development of HybridSimulation Capability

DTIC Science & Technology

2017-07-01

Directorate 3550 Aberdeen Avenue SE Kirtland AFB, NM 87117-5776 AFRL /RVBYE 11. SPONSOR/MONITOR’S REPORT NUMBER(S) AFRL -RV-PS-TR-2017-0152 12. DISTRIBUTION...Belvoir, VA 22060-6218 AFRL /RVIL Kirtland AFB, NM 87117-5776 Official Record Copy AFRL /RVBYE/Dr. Raymond Bemish 1 cy Approved for public release... AFRL -RV-PS- TR-2017-0152 AFRL -RV-PS- TR-2017-0152 CONSISTENT CONTINUUM-PARTICLE MODELING OF HYPERSONIC FLOWS AND DEVELOPMENT OF HYBRID

Mid infra-red hyper-spectral imaging with bright super continuum source and fast acousto-optic tuneable filter for cytological applications.

NASA Astrophysics Data System (ADS)

Farries, Mark; Ward, Jon; Valle, Stefano; Stephens, Gary; Moselund, Peter; van der Zanden, Koen; Napier, Bruce

2015-06-01

Mid-IR imaging spectroscopy has the potential to offer an effective tool for early cancer diagnosis. Current development of bright super-continuum sources, narrow band acousto-optic tunable filters and fast cameras have made feasible a system that can be used for fast diagnosis of cancer in vivo at point of care. The performance of a proto system that has been developed under the Minerva project is described.

Long-wavelength instabilities in a system of interacting active particles

NASA Astrophysics Data System (ADS)

Fazli, Zahra; Najafi, Ali

2018-02-01

Based on a microscopic model, we develop a continuum description for a suspension of microscopic self-propelled particles. With this continuum description we study the role of long-range interactions in destabilizing macroscopic ordered phases that are developed by short-range interactions. Long-wavelength fluctuations can destabilize both isotropic and symmetry-broken polar phases in a suspension of dipolar particles. The instabilities in a suspension of pullers (pushers) arise from splay (bend) fluctuations. Such instabilities are not seen in a suspension of quadrupolar particles.

Modeling of Pedestrian Flows Using Hybrid Models of Euler Equations and Dynamical Systems

NASA Astrophysics Data System (ADS)

Bärwolff, Günter; Slawig, Thomas; Schwandt, Hartmut

2007-09-01

In the last years various systems have been developed for controlling, planning and predicting the traffic of persons and vehicles, in particular under security aspects. Going beyond pure counting and statistical models, approaches were found to be very adequate and accurate which are based on well-known concepts originally developed in very different research areas, namely continuum mechanics and computer science. In the present paper, we outline a continuum mechanical approach for the description of pedestrain flow.

Modeling stock price dynamics by continuum percolation system and relevant complex systems analysis

NASA Astrophysics Data System (ADS)

Xiao, Di; Wang, Jun

2012-10-01

The continuum percolation system is developed to model a random stock price process in this work. Recent empirical research has demonstrated various statistical features of stock price changes, the financial model aiming at understanding price fluctuations needs to define a mechanism for the formation of the price, in an attempt to reproduce and explain this set of empirical facts. The continuum percolation model is usually referred to as a random coverage process or a Boolean model, the local interaction or influence among traders is constructed by the continuum percolation, and a cluster of continuum percolation is applied to define the cluster of traders sharing the same opinion about the market. We investigate and analyze the statistical behaviors of normalized returns of the price model by some analysis methods, including power-law tail distribution analysis, chaotic behavior analysis and Zipf analysis. Moreover, we consider the daily returns of Shanghai Stock Exchange Composite Index from January 1997 to July 2011, and the comparisons of return behaviors between the actual data and the simulation data are exhibited.

Creating a Simple Single Computational Approach to Modeling Rarefied and Continuum Flow About Aerospace Vehicles

NASA Technical Reports Server (NTRS)

Goldstein, David B.; Varghese, Philip L.

1997-01-01

We proposed to create a single computational code incorporating methods that can model both rarefied and continuum flow to enable the efficient simulation of flow about space craft and high altitude hypersonic aerospace vehicles. The code was to use a single grid structure that permits a smooth transition between the continuum and rarefied portions of the flow. Developing an appropriate computational boundary between the two regions represented a major challenge. The primary approach chosen involves coupling a four-speed Lattice Boltzmann model for the continuum flow with the DSMC method in the rarefied regime. We also explored the possibility of using a standard finite difference Navier Stokes solver for the continuum flow. With the resulting code we will ultimately investigate three-dimensional plume impingement effects, a subject of critical importance to NASA and related to the work of Drs. Forrest Lumpkin, Steve Fitzgerald and Jay Le Beau at Johnson Space Center. Below is a brief background on the project and a summary of the results as of the end of the grant.

Monitoring the HIV continuum of care in key populations across Europe and Central Asia.

PubMed

Brown, A E; Attawell, K; Hales, D; Rice, B D; Pharris, A; Supervie, V; Van Beckhoven, D; Delpech, V C; An der Heiden, M; Marcus, U; Maly, M; Noori, T

2018-05-08

The aim of the study was to measure and compare national continuum of HIV care estimates in Europe and Central Asia in three key subpopulations: men who have sex with men (MSM), people who inject drugs (PWID) and migrants. Responses to a 2016 European Centre for Disease Prevention and Control (ECDC) survey of 55 European and Central Asian countries were used to describe continuums of HIV care for the subpopulations. Data were analysed using three frameworks: Joint United Nations Programme on HIV/AIDS (UNAIDS) 90-90-90 targets; breakpoint analysis identifying reductions between adjacent continuum stages; quadrant analysis categorizing countries using 90% cut-offs for continuum stages. Overall, 29 of 48 countries reported national data for all HIV continuum stages (numbers living with HIV, diagnosed, receiving treatment and virally suppressed). Six countries reported all stages for MSM, seven for PWID and two for migrants. Thirty-one countries did not report data for MSM (34 for PWID and 41 for migrants). In countries that provided key-population data, overall, 63%, 40% and 41% of MSM, PWID and migrants living with HIV were virally suppressed, respectively (compared with 68%, 65% and 68% nationally, for countries reporting key-population data). Variation was observed between countries, with higher outcomes in subpopulations in Western Europe compared with Eastern Europe and Central Asia. Few reporting countries can produce the continuum of HIV care for the three key populations. Where data are available, differences exist in outcomes between the general and key populations. While MSM broadly mirror national outcomes (in the West), PWID and migrants experience poorer treatment and viral suppression. Countries must develop continuum measures for key populations to identify and address inequalities. © 2018 British HIV Association.

Multiscale Modeling of Structurally-Graded Materials Using Discrete Dislocation Plasticity Models and Continuum Crystal Plasticity Models

NASA Technical Reports Server (NTRS)

Saether, Erik; Hochhalter, Jacob D.; Glaessgen, Edward H.

2012-01-01

A multiscale modeling methodology that combines the predictive capability of discrete dislocation plasticity and the computational efficiency of continuum crystal plasticity is developed. Single crystal configurations of different grain sizes modeled with periodic boundary conditions are analyzed using discrete dislocation plasticity (DD) to obtain grain size-dependent stress-strain predictions. These relationships are mapped into crystal plasticity parameters to develop a multiscale DD/CP model for continuum level simulations. A polycrystal model of a structurally-graded microstructure is developed, analyzed and used as a benchmark for comparison between the multiscale DD/CP model and the DD predictions. The multiscale DD/CP model follows the DD predictions closely up to an initial peak stress and then follows a strain hardening path that is parallel but somewhat offset from the DD predictions. The difference is believed to be from a combination of the strain rate in the DD simulation and the inability of the DD/CP model to represent non-monotonic material response.

Long-term care for people with developmental disabilities: a critical analysis.

PubMed

Palley, H A; Van Hollen, V

2000-08-01

This article explores how the trends toward long-term community care affecting people with developmental disabilities developed. Appropriateness of care and quality of life issues are discussed. The article also reviews the development of long-term care for frail and disabled elderly people and explores the arguments for a continuum of care that have developed in this area. The authors conclude that future policies with respect to meeting long-term care needs for people with developmental disabilities must be addressed flexibly on an individual basis, related to individual needs, and must provide a continuum of care services.

Quantum mechanical/molecular mechanical/continuum style solvation model: time-dependent density functional theory.

PubMed

Thellamurege, Nandun M; Cui, Fengchao; Li, Hui

2013-08-28

A combined quantum mechanical/molecular mechanical/continuum (QM/MMpol/C) style method is developed for time-dependent density functional theory (TDDFT, including long-range corrected TDDFT) method, induced dipole polarizable force field, and induced surface charge continuum model. Induced dipoles and induced charges are included in the TDDFT equations to solve for the transition energies, relaxed density, and transition density. Analytic gradient is derived and implemented for geometry optimization and molecular dynamics simulation. QM/MMpol/C style DFT and TDDFT methods are used to study the hydrogen bonding of the photoactive yellow protein chromopore in ground state and excited state.

A software platform for continuum modeling of ion channels based on unstructured mesh

NASA Astrophysics Data System (ADS)

Tu, B.; Bai, S. Y.; Chen, M. X.; Xie, Y.; Zhang, L. B.; Lu, B. Z.

2014-01-01

Most traditional continuum molecular modeling adopted finite difference or finite volume methods which were based on a structured mesh (grid). Unstructured meshes were only occasionally used, but an increased number of applications emerge in molecular simulations. To facilitate the continuum modeling of biomolecular systems based on unstructured meshes, we are developing a software platform with tools which are particularly beneficial to those approaches. This work describes the software system specifically for the simulation of a typical, complex molecular procedure: ion transport through a three-dimensional channel system that consists of a protein and a membrane. The platform contains three parts: a meshing tool chain for ion channel systems, a parallel finite element solver for the Poisson-Nernst-Planck equations describing the electrodiffusion process of ion transport, and a visualization program for continuum molecular modeling. The meshing tool chain in the platform, which consists of a set of mesh generation tools, is able to generate high-quality surface and volume meshes for ion channel systems. The parallel finite element solver in our platform is based on the parallel adaptive finite element package PHG which wass developed by one of the authors [1]. As a featured component of the platform, a new visualization program, VCMM, has specifically been developed for continuum molecular modeling with an emphasis on providing useful facilities for unstructured mesh-based methods and for their output analysis and visualization. VCMM provides a graphic user interface and consists of three modules: a molecular module, a meshing module and a numerical module. A demonstration of the platform is provided with a study of two real proteins, the connexin 26 and hemolysin ion channels.

High-order continuum kinetic method for modeling plasma dynamics in phase space

DOE PAGES

Vogman, G. V.; Colella, P.; Shumlak, U.

2014-12-15

Continuum methods offer a high-fidelity means of simulating plasma kinetics. While computationally intensive, these methods are advantageous because they can be cast in conservation-law form, are not susceptible to noise, and can be implemented using high-order numerical methods. Advances in continuum method capabilities for modeling kinetic phenomena in plasmas require the development of validation tools in higher dimensional phase space and an ability to handle non-cartesian geometries. To that end, a new benchmark for validating Vlasov-Poisson simulations in 3D (x,v x,v y) is presented. The benchmark is based on the Dory-Guest-Harris instability and is successfully used to validate a continuummore » finite volume algorithm. To address challenges associated with non-cartesian geometries, unique features of cylindrical phase space coordinates are described. Preliminary results of continuum kinetic simulations in 4D (r,z,v r,v z) phase space are presented.« less

Continuum Modeling and Control of Large Nonuniform Wireless Networks via Nonlinear Partial Differential Equations

DOE PAGES

Zhang, Yang; Chong, Edwin K. P.; Hannig, Jan; ...

2013-01-01

We inmore » troduce a continuum modeling method to approximate a class of large wireless networks by nonlinear partial differential equations (PDEs). This method is based on the convergence of a sequence of underlying Markov chains of the network indexed by N , the number of nodes in the network. As N goes to infinity, the sequence converges to a continuum limit, which is the solution of a certain nonlinear PDE. We first describe PDE models for networks with uniformly located nodes and then generalize to networks with nonuniformly located, and possibly mobile, nodes. Based on the PDE models, we develop a method to control the transmissions in nonuniform networks so that the continuum limit is invariant under perturbations in node locations. This enables the networks to maintain stable global characteristics in the presence of varying node locations.« less

The wind geometry of the Wolf-Rayet star HD 191765

NASA Technical Reports Server (NTRS)

Schulte-Ladbeck, R. F.; Nordsieck, K. H.; Taylor, M.; Bjorkman, K. S.; Magalhaes, A. M.; Wolff, M. J.

1992-01-01

A time-dependent spectropolarimetric data set of HD 191765 in the wavelength range 3159-7593 A is presented. At all epochs the present observations display a large and strongly wavelength-dependent continuum polarization and reduced levels of polarization across the emission lines. The data imply a significant intrinsic continuum polarization which requires a general deviation of the electron distribution from spherical symmetry. The global shape is quite stable as a function of time; small fluctuations may arise from localized density/temperature changes. The line polarizations are consistent with an axisymmetric wind geometry and ionization stratification. A qualitative model for polarization in a Wolf-Rayet atmosphere is developed. It is argued that the blueward rise of the continuum polarization in HD 191765 can be explained if the density in the wind is high, resulting in a competition of thermal and electron-scattering continuum opacity in the vertical.

Multiscale volatility duration characteristics on financial multi-continuum percolation dynamics

NASA Astrophysics Data System (ADS)

Wang, Min; Wang, Jun

A random stock price model based on the multi-continuum percolation system is developed to investigate the nonlinear dynamics of stock price volatility duration, in an attempt to explain various statistical facts found in financial data, and have a deeper understanding of mechanisms in the financial market. The continuum percolation system is usually referred to be a random coverage process or a Boolean model, it is a member of a class of statistical physics systems. In this paper, the multi-continuum percolation (with different values of radius) is employed to model and reproduce the dispersal of information among the investors. To testify the rationality of the proposed model, the nonlinear analyses of return volatility duration series are preformed by multifractal detrending moving average analysis and Zipf analysis. The comparison empirical results indicate the similar nonlinear behaviors for the proposed model and the actual Chinese stock market.

Comparing Multidimensional and Continuum Models of Vocabulary Acquisition: An Empirical Examination of the Vocabulary Knowledge Scale

ERIC Educational Resources Information Center

Stewart, Jeffrey; Batty, Aaron Olaf; Bovee, Nicholas

2012-01-01

Second language vocabulary acquisition has been modeled both as multidimensional in nature and as a continuum wherein the learner's knowledge of a word develops along a cline from recognition through production. In order to empirically examine and compare these models, the authors assess the degree to which the Vocabulary Knowledge Scale (VKS;…

Psychometric Characteristics of the Korean Mental Health Continuum-Short Form in an Adolescent Sample

ERIC Educational Resources Information Center

Lim, Young-Jin

2014-01-01

There have been few research studies to examine the positive mental health of Asian adolescents. The aim here is to examine the factorial structure, internal consistency, test-retest reliability, and convergent/discriminant validity of a Korean version of the Mental Health Continuum-short form (K-MHC-SF), a newly developed self-report scale for…

Evaluation of the Content Literacy Continuum: Report on Program Impacts, Program Fidelity, and Contrast. Final Report. NCEE 2013-4001

ERIC Educational Resources Information Center

Corrin, William; Lindsay, James J.; Somers, Marie-Andree; Myers, Nathan E.; Meyers, Coby V.; Condon, Christopher A.; Smith, Janell K.

2012-01-01

This report presents the findings of a rigorous experimental impact evaluation and implementation study of one such intervention, the Content Literacy Continuum (CLC), developed by researchers at the University of Kansas Center for Research on Learning. This evaluation of CLC was conducted by three partnering organizations: REL Midwest, MDRC, and…

A Taxonomy for Choosing, Evaluating, and Integrating In-the-Cloud Resources in a University Environment

ERIC Educational Resources Information Center

Kahn, Russell L.

2013-01-01

This article develops and applies an analytic matrix for searching and using Web 2.0 resources along a learning continuum based on learning styles. This continuum applies core concepts of cognitive psychology, which places an emphasis on internal processes, such as motivation, thinking, attitudes, and reflection. A pilot study found that access to…

Using a Non-Equivalent Groups Quasi Experimental Design to Reduce Internal Validity Threats to Claims Made by Math and Science K-12 Teacher Recruitment Programs

NASA Astrophysics Data System (ADS)

Moin, Laura

2009-10-01

The American Recovery and Reinvestment Act national policy established in 2009 calls for ``meaningful data'' that demonstrate educational improvements, including the recruitment of high-quality teachers. The scant data available and the low credibility of many K-12 math/science teacher recruitment program evaluations remain the major barriers for the identification of effective recruitment strategies. Our study presents a methodology to better evaluate the impact of recruitment programs on increasing participants' interest in teaching careers. The research capitalizes on the use of several control groups and presents a non-equivalent groups quasi-experimental evaluation design that produces program effect claims with higher internal validity than claims generated by current program evaluations. With this method that compares responses to a teaching career interest question from undergraduates all along a continuum from just attending an information session to participating (or not) in the recruitment program, we were able to compare the effect of the program in increasing participants' interest in teaching careers versus the evolution of the same interest but in the absence of the program. We were also able to make suggestions for program improvement and further research. While our findings may not apply to other K-12 math/science teacher recruitment programs, we believe that our evaluation methodology does and will contribute to conduct stronger program evaluations. In so doing, our evaluation procedure may inform recruitment program designers and policy makers.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Leitherer, Claus; Lee, Janice C.; Hernandez, Svea

We report on the detection of Lyman continuum radiation in two nearby starburst galaxies. Tol 0440-381, Tol 1247-232, and Mrk 54 were observed with the Cosmic Origins Spectrograph on board the Hubble Space Telescope . The three galaxies have radial velocities of ∼13,000 km s{sup −1}, permitting a ∼35 Å window on the restframe Lyman continuum shortward of the Milky Way Lyman edge at 912 Å. The chosen instrument configuration using the G140L grating covers the spectral range from 912 to 2000 Å. We developed a dedicated background subtraction method to account for the temporal and spatial background variations ofmore » the detector, which is crucial at the low flux levels around 912 Å. This modified pipeline allowed us to significantly improve the statistical and systematic detector noise and will be made available to the community. We detect Lyman continuum in all three galaxies. However, we conservatively interpret the emission in Tol 0440-381 as an upper limit due to possible contamination by geocoronal Lyman series lines. We determined the current star formation properties from the far-ultraviolet continuum and spectral lines and used synthesis models to predict the Lyman continuum radiation emitted by the current population of hot stars. We discuss various model uncertainties such as, among others, atmospheres and evolution models. Lyman continuum escape fractions were derived from a comparison between the observed and predicted Lyman continuum fluxes. Tol 1247-232, Mrk 54, and Tol 0440-381 have absolute escape fractions of (4.5 ± 1.2)%, (2.5 ± 0.72)%, and <(7.1 ± 1.1)%, respectively.« less

Nonlinear modeling of crystal system transition of black phosphorus using continuum-DFT model.

PubMed

Setoodeh, A R; Farahmand, H

2018-01-24

In this paper, the nonlinear behavior of black phosphorus crystals is investigated in tandem with dispersion-corrected density functional theory (DFT-D) analysis under uniaxial loadings. From the identified anisotropic behavior of black phosphorus due to its morphological anisotropy, a hyperelastic anisotropic (HA) model named continuum-DFT is established to predict the nonlinear behavior of the material. In this respect, uniaxial Cauchy stresses are employed on both the DFT-D and HA models along the zig-zag and armchair directions. Simultaneously, the transition of the crystal system is recognized at about 4.5 GPa of the applied uniaxial tensile stress along the zig-zag direction on the DFT-D simulation in the nonlinear region. In order to develop the nonlinear continuum model, unknown constants are surveyed with the optimized least square technique. In this regard, the continuum model is obtained to reproduce the Cauchy stress-stretch and density of strain-stretch results of the DFT-D simulation. Consequently, the modified HA model is introduced to characterize the nonlinear behavior of black phosphorus along the zig-zag direction. More importantly, the specific transition of the crystal system is successfully predicted in the new modified continuum-DFT model. The results reveal that the multiscale continuum-DFT model is well defined to replicate the nonlinear behavior of black phosphorus along the zig-zag and armchair directions.

Numerical Simulation of Transitional, Hypersonic Flows using a Hybrid Particle-Continuum Method

NASA Astrophysics Data System (ADS)

Verhoff, Ashley Marie

Analysis of hypersonic flows requires consideration of multiscale phenomena due to the range of flight regimes encountered, from rarefied conditions in the upper atmosphere to fully continuum flow at low altitudes. At transitional Knudsen numbers there are likely to be localized regions of strong thermodynamic nonequilibrium effects that invalidate the continuum assumptions of the Navier-Stokes equations. Accurate simulation of these regions, which include shock waves, boundary and shear layers, and low-density wakes, requires a kinetic theory-based approach where no prior assumptions are made regarding the molecular distribution function. Because of the nature of these types of flows, there is much to be gained in terms of both numerical efficiency and physical accuracy by developing hybrid particle-continuum simulation approaches. The focus of the present research effort is the continued development of the Modular Particle-Continuum (MPC) method, where the Navier-Stokes equations are solved numerically using computational fluid dynamics (CFD) techniques in regions of the flow field where continuum assumptions are valid, and the direct simulation Monte Carlo (DSMC) method is used where strong thermodynamic nonequilibrium effects are present. Numerical solutions of transitional, hypersonic flows are thus obtained with increased physical accuracy relative to CFD alone, and improved numerical efficiency is achieved in comparison to DSMC alone because this more computationally expensive method is restricted to those regions of the flow field where it is necessary to maintain physical accuracy. In this dissertation, a comprehensive assessment of the physical accuracy of the MPC method is performed, leading to the implementation of a non-vacuum supersonic outflow boundary condition in particle domains, and more consistent initialization of DSMC simulator particles along hybrid interfaces. The relative errors between MPC and full DSMC results are greatly reduced as a direct result of these improvements. Next, a new parameter for detecting rotational nonequilibrium effects is proposed and shown to offer advantages over other continuum breakdown parameters, achieving further accuracy gains. Lastly, the capabilities of the MPC method are extended to accommodate multiple chemical species in rotational nonequilibrium, each of which is allowed to equilibrate independently, enabling application of the MPC method to more realistic atmospheric flows.

A comparison of FE beam and continuum elements for typical nitinol stent geometries

NASA Astrophysics Data System (ADS)

Ballew, Wesley; Seelecke, Stefan

2009-03-01

With interest in improved efficiency and a more complete description of the SMA material, this paper compares finite element (FE) simulations of typical stent geometries using two different constitutive models and two different element types. Typically, continuum elements are used for the simulation of stents, for example the commercial FE software ANSYS offers a continuum element based on Auricchio's SMA model. Almost every stent geometry, however, is made up of long and slender components and can be modeled more efficiently, in the computational sense, with beam elements. Using the ANSYS user programmable material feature, we implement the free energy based SMA model developed by Mueller and Seelecke into the ANSYS beam element 188. Convergence behavior for both, beam and continuum formulations, is studied in terms of element and layer number, respectively. This is systematically illustrated first for the case of a straight cantilever beam under end loading, and subsequently for a section of a z-bend wire, a typical stent sub-geometry. It is shown that the computation times for the beam element are reduced to only one third of those of the continuum element, while both formulations display a comparable force/displacement response.

On the physically based modeling of surface tension and moving contact lines with dynamic contact angles on the continuum scale

NASA Astrophysics Data System (ADS)

Huber, M.; Keller, F.; Säckel, W.; Hirschler, M.; Kunz, P.; Hassanizadeh, S. M.; Nieken, U.

2016-04-01

The description of wetting phenomena is a challenging problem on every considerable length-scale. The behavior of interfaces and contact lines on the continuum scale is caused by intermolecular interactions like the Van der Waals forces. Therefore, to describe surface tension and the resulting dynamics of interfaces and contact lines on the continuum scale, appropriate formulations must be developed. While the Continuum Surface Force (CSF) model is well-engineered for the description of interfaces, there is still a lack of treatment of contact lines, which are defined by the intersection of an ending fluid interface and a solid boundary surface. In our approach we use a balance equation for the contact line and extend the Navier-Stokes equations in analogy to the extension of a two-phase interface in the CSF model. Since this model depicts a physically motivated approach on the continuum scale, no fitting parameters are introduced and the deterministic description leads to a dynamical evolution of the system. As verification of our theory, we show a Smoothed Particle Hydrodynamics (SPH) model and simulate the evolution of droplet shapes and their corresponding contact angles.

Bound states in the continuum on periodic structures: perturbation theory and robustness.

PubMed

Yuan, Lijun; Lu, Ya Yan

2017-11-01

On periodic structures, a bound state in the continuum (BIC) is a standing or propagating Bloch wave with a frequency in the radiation continuum. Some BICs (e.g., antisymmetric standing waves) are symmetry protected, since they have incompatible symmetry with outgoing waves in the radiation channels. The propagating BICs do not have this symmetry mismatch, but they still crucially depend on the symmetry of the structure. In this Letter, a perturbation theory is developed for propagating BICs on two-dimensional periodic structures. The Letter shows that these BICs are robust against structural perturbations that preserve the symmetry, indicating that these BICs, in fact, are implicitly protected by symmetry.

Time dependent reliability model incorporating continuum damage mechanics for high-temperature ceramics

NASA Technical Reports Server (NTRS)

Duffy, Stephen F.; Gyekenyesi, John P.

1989-01-01

Presently there are many opportunities for the application of ceramic materials at elevated temperatures. In the near future ceramic materials are expected to supplant high temperature metal alloys in a number of applications. It thus becomes essential to develop a capability to predict the time-dependent response of these materials. The creep rupture phenomenon is discussed, and a time-dependent reliability model is outlined that integrates continuum damage mechanics principles and Weibull analysis. Several features of the model are presented in a qualitative fashion, including predictions of both reliability and hazard rate. In addition, a comparison of the continuum and the microstructural kinetic equations highlights a strong resemblance in the two approaches.

Computational, Experimental and Engineering Foundations of Ionic Channels as Miniaturized Sensors, Devices and Systems

DTIC Science & Technology

2003-10-01

made in an ensemble of channels of unknown orientation and number, preventing quantitative analysis . • Currents have been compared among continuum PNP...microfluidic) analysis of ion channels to obtain fundamental insights into the selectivity, conductivity, and sensitivity of ion channels [19], [6...1.1 Develop fast and efficient simulators for steady-state analysis of continuum model for extraction of I-V curves. 1.2 Create

Multiscale Fiber Kinking: Computational Micromechanics and a Mesoscale Continuum Damage Mechanics Models

NASA Technical Reports Server (NTRS)

Herraez, Miguel; Bergan, Andrew C.; Gonzalez, Carlos; Lopes, Claudio S.

2017-01-01

In this work, the fiber kinking phenomenon, which is known as the failure mechanism that takes place when a fiber reinforced polymer is loaded under longitudinal compression, is studied. A computational micromechanics model is employed to interrogate the assumptions of a recently developed mesoscale continuum damage mechanics (CDM) model for fiber kinking based on the deformation gradient decomposition (DGD) and the LaRC04 failure criteria.

HIV service delivery models towards 'Zero AIDS-related Deaths': a collaborative case study of 6 Asia and Pacific countries.

PubMed

Fujita, Masami; Poudel, Krishna C; Green, Kimberly; Wi, Teodora; Abeyewickreme, Iyanthi; Ghidinelli, Massimo; Kato, Masaya; Vun, Mean Chhi; Sopheap, Seng; San, Khin Ohnmar; Bollen, Phavady; Rai, Krishna Kumar; Dahal, Atul; Bhandari, Durga; Boas, Peniel; Yaipupu, Jessica; Sirinirund, Petchsri; Saonuam, Pairoj; Duong, Bui Duc; Nhan, Do Thi; Thu, Nguyen Thi Minh; Jimba, Masamine

2015-04-24

In the Asia-Pacific region, limited systematic assessment has been conducted on HIV service delivery models. Applying an analytical framework of the continuum of prevention and care, this study aimed to assess HIV service deliveries in six Asia and Pacific countries from the perspective of service availability, linking approaches and performance monitoring for maximizing HIV case detection and retention. Each country formed a review team that provided published and unpublished information from the national HIV program. Four types of continuum were examined: (i) service linkages between key population outreach and HIV diagnosis (vertical-community continuum); (ii) chronic care provision across HIV diagnosis and treatment (chronological continuum); (iii) linkages between HIV and other health services (horizontal continuum); and (iv) comprehensive care sites coordinating care provision (hub and heart of continuum). Regarding the vertical-community continuum, all districts had voluntary counselling and testing (VCT) in all countries except for Myanmar and Vietnam. In these two countries, limited VCT availability was a constraint for referring key populations reached. All countries monitored HIV testing coverage among key populations. Concerning the chronological continuum, the proportion of districts/townships having antiretroviral treatment (ART) was less than 70% except in Thailand, posing a barrier for accessing pre-ART/ART care. Mechanisms for providing chronic care and monitoring retention were less developed for VCT/pre-ART process compared to ART process in all countries. On the horizontal continuum, the availability of HIV testing for tuberculosis patients and pregnant women was limited and there were sub-optimal linkages between tuberculosis, antenatal care and HIV services except for Cambodia and Thailand. These two countries indicated higher HIV testing coverage than other countries. Regarding hub and heart of continuum, all countries had comprehensive care sites with different degrees of community involvement. The analytical framework was useful to identify similarities and considerable variations in service availability and linking approaches across the countries. The study findings would help each country critically adapt and adopt global recommendations on HIV service decentralization, linkages and integration. Especially, the findings would inform cross-fertilization among the countries and national HIV program reviews to determine county-specific measures for maximizing HIV case detection and retention.

The wetland continuum: a conceptual framework for interpreting biological studies

USGS Publications Warehouse

Euliss, N.H.; LaBaugh, J.W.; Fredrickson, L.H.; Mushet, D.M.; Swanson, G.A.; Winter, T.C.; Rosenberry, D.O.; Nelson, R.D.

2004-01-01

We describe a conceptual model, the wetland continuum, which allows wetland managers, scientists, and ecologists to consider simultaneously the influence of climate and hydrologic setting on wetland biological communities. Although multidimensional, the wetland continuum is most easily represented as a two-dimensional gradient, with ground water and atmospheric water constituting the horizontal and vertical axis, respectively. By locating the position of a wetland on both axes of the continuum, the potential biological expression of the wetland can be predicted at any point in time. The model provides a framework useful in the organization and interpretation of biological data from wetlands by incorporating the dynamic changes these systems undergo as a result of normal climatic variation rather than placing them into static categories common to many wetland classification systems. While we developed this model from the literature available for depressional wetlands in the prairie pothole region of North America, we believe the concept has application to wetlands in many other geographic locations.

Hard X rays and low-energy gamma rays from the Moon: Dependence of the continuum on the regolith composition and the solar activity

NASA Astrophysics Data System (ADS)

Banerjee, D.; Gasnault, O.

2008-07-01

The primary aim of the high-energy X-ray spectrometer (HEX) experiment on the Chandrayaan-1 mission to the Moon is to characterize the movement of volatiles on the lunar surface through the detection of the 46.5 keV line from 210Pb, a decay product of 222Rn. An important consideration for design and operation of HEX is to estimate the continuum background signal expected from the lunar surface, as well as its dependence on solar activity and lunar composition. We have developed a Monte Carlo code utilizing Geant4 for simulating the interaction of cosmic rays in the lunar regolith, and we estimated the variation in the continuum background in the energy region of interest for various lunar compositions. Dependence of the continuum background on solar activity was also evaluated considering ferroan anorthositic (FAN) composition. Our results suggest the viability of inferring lithologic characteristics of planetary surfaces based on a study of low-energy gamma ray emission.

Multiscaling for systems with a broad continuum of characteristic lengths and times: Structural transitions in nanocomposites.

PubMed

Pankavich, S; Ortoleva, P

2010-06-01

The multiscale approach to N-body systems is generalized to address the broad continuum of long time and length scales associated with collective behaviors. A technique is developed based on the concept of an uncountable set of time variables and of order parameters (OPs) specifying major features of the system. We adopt this perspective as a natural extension of the commonly used discrete set of time scales and OPs which is practical when only a few, widely separated scales exist. The existence of a gap in the spectrum of time scales for such a system (under quasiequilibrium conditions) is used to introduce a continuous scaling and perform a multiscale analysis of the Liouville equation. A functional-differential Smoluchowski equation is derived for the stochastic dynamics of the continuum of Fourier component OPs. A continuum of spatially nonlocal Langevin equations for the OPs is also derived. The theory is demonstrated via the analysis of structural transitions in a composite material, as occurs for viral capsids and molecular circuits.

Continuum Lowering and Fermi-Surface Rising in Strongly Coupled and Degenerate Plasmas

NASA Astrophysics Data System (ADS)

Hu, S. X.

2017-08-01

Continuum lowering is a well known and important physics concept that describes the ionization potential depression (IPD) in plasmas caused by thermal- or pressure-induced ionization of outer-shell electrons. The existing IPD models are often used to characterize plasma conditions and to gauge opacity calculations. Recent precision measurements have revealed deficits in our understanding of continuum lowering in dense hot plasmas. However, these investigations have so far been limited to IPD in strongly coupled but nondegenerate plasmas. Here, we report a first-principles study of the K -edge shifting in both strongly coupled and fully degenerate carbon plasmas, with quantum molecular dynamics calculations based on the all-electron density-functional theory. The resulting K -edge shifting versus plasma density, as a probe to the continuum lowering and the Fermi-surface rising, is found to be significantly different from predictions of existing IPD models. In contrast, a simple model of "single-atom-in-box," developed in this work, accurately predicts K -edge locations as ab initio calculations provide.

Engagement of Sectors Other than Health in Integrated Health Governance, Policy, and Action.

PubMed

de Leeuw, Evelyne

2017-03-20

Health is created largely outside the health sector. Engagement in health governance, policy, and intervention development and implementation by sectors other than health is therefore important. Recent calls for building and implementing Health in All Policies, and continued arguments for intersectoral action, may strengthen the potential that other sectors have for health. This review clarifies the conceptual foundations for integral health governance, policy, and action, delineates the different sectors and their possible engagement, and provides an overview of a continuum of methods of engagement with other sectors to secure integration. This continuum ranges from institutional (re)design to value-based narratives. Depending on the lens applied, different elements can be identified within the continuum. This review is built on insights from political science, leadership studies, public health, empirical Health in All Policy research, knowledge and evidence nexus approaches, and community perspectives. Successful integration of health governance, policy, and action depends on integration of the elements on the continuum.

5 CFR 412.102 - Purpose.

Code of Federal Regulations, 2010 CFR

2010-01-01

... continuing development of SES members. (b) This part identifies a continuum of leadership development... adequate number of well-prepared and qualified candidates to fill leadership positions. ...

5 CFR 412.102 - Purpose.

Code of Federal Regulations, 2012 CFR

2012-01-01

... continuing development of SES members. (b) This part identifies a continuum of leadership development... adequate number of well-prepared and qualified candidates to fill leadership positions. ...

5 CFR 412.102 - Purpose.

Code of Federal Regulations, 2013 CFR

2013-01-01

... continuing development of SES members. (b) This part identifies a continuum of leadership development... adequate number of well-prepared and qualified candidates to fill leadership positions. ...

5 CFR 412.102 - Purpose.

Code of Federal Regulations, 2014 CFR

2014-01-01

... continuing development of SES members. (b) This part identifies a continuum of leadership development... adequate number of well-prepared and qualified candidates to fill leadership positions. ...

5 CFR 412.102 - Purpose.

Code of Federal Regulations, 2011 CFR

2011-01-01

... continuing development of SES members. (b) This part identifies a continuum of leadership development... adequate number of well-prepared and qualified candidates to fill leadership positions. ...

Commentary: faculty development: the road less traveled.

PubMed

Steinert, Yvonne

2011-04-01

The 2020 Vision of Faculty Development Across the Medical Education Continuum conference, and the resulting articles in this issue, addressed a number of topics related to the future of faculty development. Focusing primarily on the development of faculty members as teachers, conference participants debated issues related to core teaching competencies, barriers to effective teaching, competency-based assessment, relationship-centered care, the hidden curriculum that faculty members encounter, instructional technologies, continuing medical education, and research on faculty development. However, a number of subjects were not addressed. If faculty development is meant to play a leading role in ensuring that academic medicine remains responsive to faculty members and societal needs, additional themes should be considered. Medical educators should broaden the focus of faculty development and target the various roles that clinicians and basic scientists play, including those of leader and scholar. They must also remember that faculty development can play a critical role in curricular and organizational change and thus enlarge the scope of faculty development by moving beyond formal, structured activities, incorporating notions of self-directed learning, peer mentoring, and work-based learning. In addition, medical educators should try to situate faculty development in a more global context and collaborate with international colleagues in the transformation of medical education and health care delivery. It has been said that faculty development can play a critical role in promoting culture change at a number of levels. A broader mandate, innovative programming that takes advantage of communities of practice, and new partnerships can help to achieve this objective. © by the Association of American Medical Colleges.

A Framework for Health Communication Across the HIV Treatment Continuum

PubMed Central

Van Lith, Lynn M.; Mallalieu, Elizabeth C.; Packman, Zoe R.; Myers, Emily; Ahanda, Kim Seifert; Harris, Emily; Gurman, Tilly; Figueroa, Maria-Elena

2017-01-01

Background: As test and treat rolls out, effective interventions are needed to address the determinants of outcomes across the HIV treatment continuum and ensure that people infected with HIV are promptly tested, initiate treatment early, adhere to treatment, and are virally suppressed. Communication approaches offer viable options for promoting relevant behaviors across the continuum. Conceptual Framework: This article introduces a conceptual framework, which can guide the development of effective health communication interventions and activities that aim to impact behaviors across the HIV treatment continuum in low- and medium-income countries. The framework includes HIV testing and counseling, linkage to care, retention in pre-antiretroviral therapy and antiretroviral therapy initiation in one single-stage linkage to care and treatment, and adherence for viral suppression. The determinants of behaviors vary across the continuum and include both facilitators and barriers with communication interventions designed to focus on specific determinants presented in the model. At each stage, relevant determinants occur at the various levels of the social–ecological model: intrapersonal, interpersonal, health services, community, and policy. Effective health communication interventions have mainly relied on mHealth, interpersonal communication through service providers and peers, community support groups, and treatment supporters. Discussion: The conceptual framework and evidence presented highlight areas across the continuum where health communication can significantly impact treatment outcomes to reach the 90-90-90 goals by strategically addressing key behavioral determinants. As test and treat rolls out, multifaceted health communication approaches will be critical. PMID:27930606

Deformation in Metallic Glass: Connecting Atoms to Continua

NASA Astrophysics Data System (ADS)

Hinkle, Adam R.; Falk, Michael L.; Rycroft, Chris H.; Shields, Michael D.

Metallic glasses like other amorphous solids experience strain localization as the primary mode of failure. However, the development of continuum constitutive laws which provide a quantitative description of disorder and mechanical deformation remains an open challenge. Recent progress has shown the necessity of accurately capturing fluctuations in material structure, in particular the statistical changes in potential energy of the atomic constituents during the non-equilibrium process of applied shear. Here we directly cross-compare molecular dynamics shear simulations of a ZrCu glass with continuum shear transformation zone (STZ) theory representations. We present preliminary results for a methodology to coarse-grain detailed molecular dynamics data with the goal of initializing a continuum representation in the STZ theory. NSF Grants Awards 1107838, 1408685, and 0801471.

Workplace disaster preparedness and response: the employee assistance program continuum of services.

PubMed

Paul, Jan; Blum, Dorothy

2005-01-01

Response programs for workplace critical and traumatic events are becoming an acknowledged and sought after standard of care. The current trauma literature recognizes what goes on in the workplace between the Employee Assistance Program (EAP) and management. The authors have taken this intra-organizational relationship, assimilated the information, and developed a model that recognizes and supports management throughout the continuum of response to workplace traumatic events. The model recognizes the EAP as an important workplace resource and tool in management's ability to strike the balance of managing the workforce while assisting in recovery following workplace trauma. The introduced concept defines the continuum and highlights the before, during, and after phases, showing how EAP supports management in most effectively doing their job.

The continuum of spreading depolarizations in acute cortical lesion development: Examining Leão’s legacy

PubMed Central

Shuttleworth, C William; Kirov, Sergei A; Ayata, Cenk; Hinzman, Jason M; Foreman, Brandon; Andrew, R David; Boutelle, Martyn G; Brennan, KC; Carlson, Andrew P; Dahlem, Markus A; Drenckhahn, Christoph; Dohmen, Christian; Fabricius, Martin; Farkas, Eszter; Feuerstein, Delphine; Graf, Rudolf; Helbok, Raimund; Lauritzen, Martin; Major, Sebastian; Oliveira-Ferreira, Ana I; Richter, Frank; Rosenthal, Eric S; Sakowitz, Oliver W; Sánchez-Porras, Renán; Santos, Edgar; Schöll, Michael; Strong, Anthony J; Urbach, Anja; Westover, M Brandon; Winkler, Maren KL; Witte, Otto W; Woitzik, Johannes; Dreier, Jens P

2016-01-01

A modern understanding of how cerebral cortical lesions develop after acute brain injury is based on Aristides Leão’s historic discoveries of spreading depression and asphyxial/anoxic depolarization. Treated as separate entities for decades, we now appreciate that these events define a continuum of spreading mass depolarizations, a concept that is central to understanding their pathologic effects. Within minutes of acute severe ischemia, the onset of persistent depolarization triggers the breakdown of ion homeostasis and development of cytotoxic edema. These persistent changes are diagnosed as diffusion restriction in magnetic resonance imaging and define the ischemic core. In delayed lesion growth, transient spreading depolarizations arise spontaneously in the ischemic penumbra and induce further persistent depolarization and excitotoxic damage, progressively expanding the ischemic core. The causal role of these waves in lesion development has been proven by real-time monitoring of electrophysiology, blood flow, and cytotoxic edema. The spreading depolarization continuum further applies to other models of acute cortical lesions, suggesting that it is a universal principle of cortical lesion development. These pathophysiologic concepts establish a working hypothesis for translation to human disease, where complex patterns of depolarizations are observed in acute brain injury and appear to mediate and signal ongoing secondary damage. PMID:27328690

Managing Innovation to Maximize Value Along the Discovery-Translation-Application Continuum.

PubMed

Waldman, S A; Terzic, A

2017-01-01

Success in pharmaceutical development led to a record 51 drugs approved in the past year, surpassing every previous year since 1950. Technology innovation enabled identification and exploitation of increasingly precise disease targets ensuring next generation diagnostic and therapeutic products for patient management. The expanding biopharmaceutical portfolio stands, however, in contradistinction to the unsustainable costs that reflect remarkable challenges of clinical development programs. This annual Therapeutic Innovations issue juxtaposes advances in translating molecular breakthroughs into transformative therapies with essential considerations for lowering attrition and improving the cost-effectiveness of the drug-development paradigm. Realizing the discovery-translation-application continuum mandates a congruent approval, adoption, and access triad. © 2016 ASCPT.

Managing Innovation to Maximize Value Along the Discovery-Translation-Application Continuum

PubMed Central

Waldman, SA; Terzic, A

2017-01-01

Success in pharmaceutical development led to a record 51 drug approved in the past year, surpassing every previous year since 1950. Technology innovation enabled identification and exploitation of increasingly precise disease targets ensuring a next generation diagnostic and therapeutic products for patient management. The expanding biopharmaceutical portfolio stands however in contradistinction to the unsustainable costs that reflect remarkable challenges of clinical development programs. This annual Therapeutic Innovations issue juxtaposes advances in translating molecular breakthroughs into transformative therapies with essential considerations for lowering attrition and improving the cost-effectiveness of the drug development paradigm. Realizing the discovery-translation-application continuum mandates a congruent approval, adoption and access triad. PMID:27869291

An Off-Lattice Hybrid Discrete-Continuum Model of Tumor Growth and Invasion

PubMed Central

Jeon, Junhwan; Quaranta, Vito; Cummings, Peter T.

2010-01-01

Abstract We have developed an off-lattice hybrid discrete-continuum (OLHDC) model of tumor growth and invasion. The continuum part of the OLHDC model describes microenvironmental components such as matrix-degrading enzymes, nutrients or oxygen, and extracellular matrix (ECM) concentrations, whereas the discrete portion represents individual cell behavior such as cell cycle, cell-cell, and cell-ECM interactions and cell motility by the often-used persistent random walk, which can be depicted by the Langevin equation. Using this framework of the OLHDC model, we develop a phenomenologically realistic and bio/physically relevant model that encompasses the experimentally observed superdiffusive behavior (at short times) of mammalian cells. When systemic simulations based on the OLHDC model are performed, tumor growth and its morphology are found to be strongly affected by cell-cell adhesion and haptotaxis. There is a combination of the strength of cell-cell adhesion and haptotaxis in which fingerlike shapes, characteristic of invasive tumor, are observed. PMID:20074513

Continuum and discrete approach in modeling biofilm development and structure: a review.

PubMed

Mattei, M R; Frunzo, L; D'Acunto, B; Pechaud, Y; Pirozzi, F; Esposito, G

2018-03-01

The scientific community has recognized that almost 99% of the microbial life on earth is represented by biofilms. Considering the impacts of their sessile lifestyle on both natural and human activities, extensive experimental activity has been carried out to understand how biofilms grow and interact with the environment. Many mathematical models have also been developed to simulate and elucidate the main processes characterizing the biofilm growth. Two main mathematical approaches for biomass representation can be distinguished: continuum and discrete. This review is aimed at exploring the main characteristics of each approach. Continuum models can simulate the biofilm processes in a quantitative and deterministic way. However, they require a multidimensional formulation to take into account the biofilm spatial heterogeneity, which makes the models quite complicated, requiring significant computational effort. Discrete models are more recent and can represent the typical multidimensional structural heterogeneity of biofilm reflecting the experimental expectations, but they generate computational results including elements of randomness and introduce stochastic effects into the solutions.

Understanding the shock and detonation response of high explosives at the continuum and meso scales

NASA Astrophysics Data System (ADS)

Handley, C. A.; Lambourn, B. D.; Whitworth, N. J.; James, H. R.; Belfield, W. J.

2018-03-01

The shock and detonation response of high explosives has been an active research topic for more than a century. In recent years, high quality data from experiments using embedded gauges and other diagnostic techniques have inspired the development of a range of new high-fidelity computer models for explosives. The experiments and models have led to new insights, both at the continuum scale applicable to most shock and detonation experiments, and at the mesoscale relevant to hotspots and burning within explosive microstructures. This article reviews the continuum and mesoscale models, and their application to explosive phenomena, gaining insights to aid future model development and improved understanding of the physics of shock initiation and detonation propagation. In particular, it is argued that "desensitization" and the effect of porosity on high explosives can both be explained by the combined effect of thermodynamics and hydrodynamics, rather than the traditional hotspot-based explanations linked to pressure-dependent reaction rates.

Hypersonic research at Stanford University

NASA Technical Reports Server (NTRS)

Candler, Graham; Maccormack, Robert

1988-01-01

The status of the hypersonic research program at Stanford University is discussed and recent results are highlighted. The main areas of interest in the program are the numerical simulation of radiating, reacting and thermally excited flows, the investigation and numerical solution of hypersonic shock wave physics, the extension of the continuum fluid dynamic equations to the transition regime between continuum and free-molecule flow, and the development of novel numerical algorithms for efficient particulate simulations of flowfields.

Continuation through Singularity of Continuum Multiphase Algorithms

DTIC Science & Technology

2013-03-01

capturing simulation of two-phase flow ; a singularity- free mesoscopic simulation that bridges atomic and continuum scales; and a physics-based closure...for free surface flow . The full two-way coupling was found to be irrelevant to the overall objective of developing a closure model to allow...The method can be used for the study of single species free - surface flow , for instance, in the case of pinch-off of a liquid thread during the

On the path to 2025: understanding the Alzheimer's disease continuum.

PubMed

Aisen, Paul S; Cummings, Jeffrey; Jack, Clifford R; Morris, John C; Sperling, Reisa; Frölich, Lutz; Jones, Roy W; Dowsett, Sherie A; Matthews, Brandy R; Raskin, Joel; Scheltens, Philip; Dubois, Bruno

2017-08-09

Basic research advances in recent years have furthered our understanding of the natural history of Alzheimer's disease (AD). It is now recognized that pathophysiological changes begin many years prior to clinical manifestations of disease and the spectrum of AD spans from clinically asymptomatic to severely impaired. Defining AD purely by its clinical presentation is thus artificial and efforts have been made to recognize the disease based on both clinical and biomarker findings. Advances with biomarkers have also prompted a shift in how the disease is considered as a clinico-pathophysiological entity, with an increasing appreciation that AD should not only be viewed with discrete and defined clinical stages, but as a multifaceted process moving along a seamless continuum. Acknowledging this concept is critical to understanding the development process for disease-modifying therapies, and for initiating effective diagnostic and disease management options. In this article, we discuss the concept of a disease continuum from pathophysiological, biomarker, and clinical perspectives, and highlight the importance of considering AD as a continuum rather than discrete stages. While the pathophysiology of AD has still not been elucidated completely, there is ample evidence to support researchers and clinicians embracing the view of a disease continuum in their study, diagnosis, and management of the disease.

Modal kinematics for multisection continuum arms.

PubMed

Godage, Isuru S; Medrano-Cerda, Gustavo A; Branson, David T; Guglielmino, Emanuele; Caldwell, Darwin G

2015-05-13

This paper presents a novel spatial kinematic model for multisection continuum arms based on mode shape functions (MSF). Modal methods have been used in many disciplines from finite element methods to structural analysis to approximate complex and nonlinear parametric variations with simple mathematical functions. Given certain constraints and required accuracy, this helps to simplify complex phenomena with numerically efficient implementations leading to fast computations. A successful application of the modal approximation techniques to develop a new modal kinematic model for general variable length multisection continuum arms is discussed. The proposed method solves the limitations associated with previous models and introduces a new approach for readily deriving exact, singularity-free and unique MSF's that simplifies the approach and avoids mode switching. The model is able to simulate spatial bending as well as straight arm motions (i.e., pure elongation/contraction), and introduces inverse position and orientation kinematics for multisection continuum arms. A kinematic decoupling feature, splitting position and orientation inverse kinematics is introduced. This type of decoupling has not been presented for these types of robotic arms before. The model also carefully accounts for physical constraints in the joint space to provide enhanced insight into practical mechanics and impose actuator mechanical limitations onto the kinematics thus generating fully realizable results. The proposed method is easily applicable to a broad spectrum of continuum arm designs.

Teachers' Development Model to Authentic Assessment by Empowerment Evaluation Approach

ERIC Educational Resources Information Center

Charoenchai, Charin; Phuseeorn, Songsak; Phengsawat, Waro

2015-01-01

The purposes of this study were 1) Study teachers authentic assessment, teachers comprehension of authentic assessment and teachers needs for authentic assessment development. 2) To create teachers development model. 3) Experiment of teachers development model. 4) Evaluate effectiveness of teachers development model. The research is divided into 4…

Parameterizations of Chromospheric Condensations in dG and dMe Model Flare Atmospheres

NASA Astrophysics Data System (ADS)

Kowalski, Adam F.; Allred, Joel C.

2018-01-01

The origin of the near-ultraviolet and optical continuum radiation in flares is critical for understanding particle acceleration and impulsive heating in stellar atmospheres. Radiative-hydrodynamic (RHD) simulations in 1D have shown that high energy deposition rates from electron beams produce two flaring layers at T ∼ 104 K that develop in the chromosphere: a cooling condensation (downflowing compression) and heated non-moving (stationary) flare layers just below the condensation. These atmospheres reproduce several observed phenomena in flare spectra, such as the red-wing asymmetry of the emission lines in solar flares and a small Balmer jump ratio in M dwarf flares. The high beam flux simulations are computationally expensive in 1D, and the (human) timescales for completing NLTE models with adaptive grids in 3D will likely be unwieldy for some time to come. We have developed a prescription for predicting the approximate evolved states, continuum optical depth, and emergent continuum flux spectra of RHD model flare atmospheres. These approximate prescriptions are based on an important atmospheric parameter: the column mass ({m}{ref}) at which hydrogen becomes nearly completely ionized at the depths that are approximately in steady state with the electron beam heating. Using this new modeling approach, we find that high energy flux density (>F11) electron beams are needed to reproduce the brightest observed continuum intensity in IRIS data of the 2014 March 29 X1 solar flare, and that variation in {m}{ref} from 0.001 to 0.02 g cm‑2 reproduces most of the observed range of the optical continuum flux ratios at the peak of M dwarf flares.

Development of an HIV Testing Dashboard to Complement the HIV Care Continuum Among MSM, PWID, and Heterosexuals in Washington, DC, 2007-2015.

PubMed

Patrick, Rudy; Greenberg, Alan; Magnus, Manya; Opoku, Jenevieve; Kharfen, Michael; Kuo, Irene

2017-07-01

We developed an HIV testing dashboard to complement the HIV care continuum in selected high-risk populations. Using National HIV Behavioral Surveillance (NHBS) data, we examined trends in HIV testing and care for men who have sex with men (MSM), persons who inject drugs (PWID), and heterosexuals at elevated risk (HET). Between 2007 and 2015, 4792 participants ≥18 years old completed a behavioral survey and were offered HIV testing. For the testing dashboard, proportions ever tested, tested in the past year, testing HIV-positive, and newly testing positive were calculated. An abbreviated care continuum for self-reported positive (SRP) persons included ever engagement in care, past year care, and current antiretroviral (ARV) use. The testing dashboard and care continuum were calculated separately for each population. Chi-square test for trend was used to assess significant trends over time. Among MSM, lifetime HIV testing and prevalence significantly increased from 96% to 98% (P = 0.01) and 14%-20% (P = 0.02) over time; prevalence was highest among black MSM at all time points. HIV prevalence among female persons who inject drugs was significantly higher in 2015 vs. 2009 (27% and 13%; P < 0.01). Among heterosexuals at elevated risk from 2010 to 2013, annual testing increased significantly (45%-73%; P < 0.001) and the proportion newly diagnosed decreased significantly (P < 0.01). Self-reported positive MSM had high levels of care engagement and antiretroviral use; among self-reported positive persons who inject drugs and heterosexuals at elevated risk, past year care engagement and antiretroviral use increased over time. The HIV testing dashboard can be used to complement the HIV care continuum to display improvements and disparities in HIV testing and care over time.

Opportunities for IPY Higher Education and Outreach

NASA Astrophysics Data System (ADS)

Sparrow, E. B.

2007-12-01

A very rich network for higher education and outreach during the fourth International Polar Year (IPY) exists through the University of the Arctic (UArctic, www.uarctic.org), a collaborative consortium of more than ninety institutions e.g. universities, colleges, and other organizations committed to higher education and research in the North, as well as eighteen other projects submitted as Expression of Intents to the IPY Joint Committee formed into an IPY cluster. The coordination office for this UArctic IPY education outreach efforts is located at the University of Alaska Fairbanks (www.uaf.edu and www.alaska.edu/ipy). The education outreach programs reflect a continuum of learning as a lifelong process that targets different audiences and approaches: 1) primary and secondary students through teacher professional development workshops on science teaching and research; 2) undergraduate students via education and research experience; 3) graduate students through integrated education and research; 4) early career scientists/university faculty via professional development; and 5) communities/ general public via continuing education/adult education either through formal or informal ways. Additionally there are organizations such as the Association of Polar Early Career Scientists (APECS) and the Youth Steering Committee (YSC) including a newly formed group on tertiary education to nurture the next generation of polar and non-polar scientists and foster the leadership of the next IPY.

Schizophrenia and the neurodevelopmental continuum:evidence from genomics

PubMed Central

Owen, Michael J.; O'Donovan, Michael C.

2017-01-01

The idea that disturbances occurring early in brain development contribute to the pathogenesis of schizophrenia, often referred to as the neurodevelopmental hypothesis, has become widely accepted. Despite this, the disorder is viewed as being distinct nosologically, and by implication pathophysiologically and clinically, from syndromes such as autism spectrum disorders, attention‐deficit/hyperactivity disorder (ADHD) and intellectual disability, which typically present in childhood and are grouped together as “neurodevelopmental disorders”. An alternative view is that neurodevelopmental disorders, including schizophrenia, rather than being etiologically discrete entities, are better conceptualized as lying on an etiological and neurodevelopmental continuum, with the major clinical syndromes reflecting the severity, timing and predominant pattern of abnormal brain development and resulting functional abnormalities. It has also been suggested that, within the neurodevelopmental continuum, severe mental illnesses occupy a gradient of decreasing neurodevelopmental impairment as follows: intellectual disability, autism spectrum disorders, ADHD, schizophrenia and bipolar disorder. Recent genomic studies have identified large numbers of specific risk DNA changes and offer a direct and robust test of the predictions of the neurodevelopmental continuum model and gradient hypothesis. These findings are reviewed in detail. They not only support the view that schizophrenia is a disorder whose origins lie in disturbances of brain development, but also that it shares genetic risk and pathogenic mechanisms with the early onset neurodevelopmental disorders (intellectual disability, autism spectrum disorders and ADHD). They also support the idea that these disorders lie on a gradient of severity, implying that they differ to some extent quantitatively as well as qualitatively. These findings have important implications for nosology, clinical practice and research. PMID:28941101

Schizophrenia and the neurodevelopmental continuum:evidence from genomics.

PubMed

Owen, Michael J; O'Donovan, Michael C

2017-10-01

The idea that disturbances occurring early in brain development contribute to the pathogenesis of schizophrenia, often referred to as the neurodevelopmental hypothesis, has become widely accepted. Despite this, the disorder is viewed as being distinct nosologically, and by implication pathophysiologically and clinically, from syndromes such as autism spectrum disorders, attention-deficit/hyperactivity disorder (ADHD) and intellectual disability, which typically present in childhood and are grouped together as "neurodevelopmental disorders". An alternative view is that neurodevelopmental disorders, including schizophrenia, rather than being etiologically discrete entities, are better conceptualized as lying on an etiological and neurodevelopmental continuum, with the major clinical syndromes reflecting the severity, timing and predominant pattern of abnormal brain development and resulting functional abnormalities. It has also been suggested that, within the neurodevelopmental continuum, severe mental illnesses occupy a gradient of decreasing neurodevelopmental impairment as follows: intellectual disability, autism spectrum disorders, ADHD, schizophrenia and bipolar disorder. Recent genomic studies have identified large numbers of specific risk DNA changes and offer a direct and robust test of the predictions of the neurodevelopmental continuum model and gradient hypothesis. These findings are reviewed in detail. They not only support the view that schizophrenia is a disorder whose origins lie in disturbances of brain development, but also that it shares genetic risk and pathogenic mechanisms with the early onset neurodevelopmental disorders (intellectual disability, autism spectrum disorders and ADHD). They also support the idea that these disorders lie on a gradient of severity, implying that they differ to some extent quantitatively as well as qualitatively. These findings have important implications for nosology, clinical practice and research. © 2017 World Psychiatric Association.

PCE: web tools to compute protein continuum electrostatics

PubMed Central

Miteva, Maria A.; Tufféry, Pierre; Villoutreix, Bruno O.

2005-01-01

PCE (protein continuum electrostatics) is an online service for protein electrostatic computations presently based on the MEAD (macroscopic electrostatics with atomic detail) package initially developed by D. Bashford [(2004) Front Biosci., 9, 1082–1099]. This computer method uses a macroscopic electrostatic model for the calculation of protein electrostatic properties, such as pKa values of titratable groups and electrostatic potentials. The MEAD package generates electrostatic energies via finite difference solution to the Poisson–Boltzmann equation. Users submit a PDB file and PCE returns potentials and pKa values as well as color (static or animated) figures displaying electrostatic potentials mapped on the molecular surface. This service is intended to facilitate electrostatics analyses of proteins and thereby broaden the accessibility to continuum electrostatics to the biological community. PCE can be accessed at . PMID:15980492

Waste IPSC : Thermal-Hydrologic-Chemical-Mechanical (THCM) modeling and simulation.

DOE Office of Scientific and Technical Information (OSTI.GOV)

Freeze, Geoffrey A.; Wang, Yifeng; Arguello, Jose Guadalupe, Jr.

2010-10-01

Waste IPSC Objective is to develop an integrated suite of high performance computing capabilities to simulate radionuclide movement through the engineered components and geosphere of a radioactive waste storage or disposal system: (1) with robust thermal-hydrologic-chemical-mechanical (THCM) coupling; (2) for a range of disposal system alternatives (concepts, waste form types, engineered designs, geologic settings); (3) for long time scales and associated large uncertainties; (4) at multiple model fidelities (sub-continuum, high-fidelity continuum, PA); and (5) in accordance with V&V and software quality requirements. THCM Modeling collaborates with: (1) Other Waste IPSC activities: Sub-Continuum Processes (and FMM), Frameworks and Infrastructure (and VU,more » ECT, and CT); (2) Waste Form Campaign; (3) Used Fuel Disposition (UFD) Campaign; and (4) ASCEM.« less

A Dyadic Behavioral Intervention to Optimize Same Sex Male Couples’ Engagement Across the HIV Care Continuum: Development of and Protocol for an Innovative Couples-based Approach (Partner Steps)

PubMed Central

2016-01-01

Background An estimated one- to two-thirds of new human immunodeficiency virus (HIV) infections among US men who have sex with men (MSM) occur within the context of primary partnerships. Thus, HIV interventions that recognize and harness the power of relationships are needed. Increasingly, HIV prevention efforts are being directed toward improving engagement across the HIV care continuum from testing to linkage to care, antiretroviral therapy (ART) adherence, engagement in care, and viral suppression. However, to our knowledge, no behavioral interventions have attempted to address the HIV care continuum using a dyadic approach. Objective The objective of this paper is to describe the development of and protocol for an innovative couples-based approach to improving treatment adherence and engagement in care among HIV serodiscordant and concordant HIV-positive same sex male couples in the United States. Methods We developed the Partner Steps intervention by drawing from relationship-oriented theory, existing efficacious individual-level ART adherence interventions, couple-focused HIV prevention interventions, and expert consultation. We incorporated new content to address all aspects of the HIV care continuum (eg, linkage to and retention in care) and to draw on relationship strengths through interactive activities. Results The resulting theory-based Partner Steps intervention is delivered by a trained bachelors-level counselor (interventionist) over 2 in-person sessions with male-male dyads in which at least 1 partner has recent suboptimal engagement in HIV care. Each session is designed to use relationship strengths to increase motivation for HIV care and treatment, and cover sequential intervention “steps” relating to specific challenges in HIV care engagement and barriers to ART adherence. For each step, couples work with a trained interventionist to identify their unique challenges, actively problem-solve with the interventionist, and articulate and commit to working together to implement a plan in which each partner agrees to complete specific tasks. Conclusions We drew on theory and evidence to develop novel intervention strategies that leverage strengths of relationships to address engagement across the entire HIV care continuum. We provide details on intervention development and content that may be of use to researchers as well as medical and mental health professionals for whom a dyadic approach to HIV prevention and care may best suit their patient population. PMID:27562905

A Dyadic Behavioral Intervention to Optimize Same Sex Male Couples' Engagement Across the HIV Care Continuum: Development of and Protocol for an Innovative Couples-based Approach (Partner Steps).

PubMed

Bazzi, Angela Robertson; Fergus, Kirkpatrick B; Stephenson, Rob; Finneran, Catherine A; Coffey-Esquivel, Julia; Hidalgo, Marco A; Hoehnle, Sam; Sullivan, Patrick S; Garofalo, Robert; Mimiaga, Matthew J

2016-08-25

An estimated one- to two-thirds of new human immunodeficiency virus (HIV) infections among US men who have sex with men (MSM) occur within the context of primary partnerships. Thus, HIV interventions that recognize and harness the power of relationships are needed. Increasingly, HIV prevention efforts are being directed toward improving engagement across the HIV care continuum from testing to linkage to care, antiretroviral therapy (ART) adherence, engagement in care, and viral suppression. However, to our knowledge, no behavioral interventions have attempted to address the HIV care continuum using a dyadic approach. The objective of this paper is to describe the development of and protocol for an innovative couples-based approach to improving treatment adherence and engagement in care among HIV serodiscordant and concordant HIV-positive same sex male couples in the United States. We developed the Partner Steps intervention by drawing from relationship-oriented theory, existing efficacious individual-level ART adherence interventions, couple-focused HIV prevention interventions, and expert consultation. We incorporated new content to address all aspects of the HIV care continuum (eg, linkage to and retention in care) and to draw on relationship strengths through interactive activities. The resulting theory-based Partner Steps intervention is delivered by a trained bachelors-level counselor (interventionist) over 2 in-person sessions with male-male dyads in which at least 1 partner has recent suboptimal engagement in HIV care. Each session is designed to use relationship strengths to increase motivation for HIV care and treatment, and cover sequential intervention "steps" relating to specific challenges in HIV care engagement and barriers to ART adherence. For each step, couples work with a trained interventionist to identify their unique challenges, actively problem-solve with the interventionist, and articulate and commit to working together to implement a plan in which each partner agrees to complete specific tasks. We drew on theory and evidence to develop novel intervention strategies that leverage strengths of relationships to address engagement across the entire HIV care continuum. We provide details on intervention development and content that may be of use to researchers as well as medical and mental health professionals for whom a dyadic approach to HIV prevention and care may best suit their patient population.

Continuum Lowering and Fermi-Surface Rising in Strongly Coupled and Degenerate Plasmas

DOE Office of Scientific and Technical Information (OSTI.GOV)

Hu, S. X.

Here, continuum lowering is a well-known and important physics concept that describes the ionization potential depression (IPD) in plasmas caused by thermal-/pressure-induced ionization of outer-shell electrons. The existing IPD models are often used to characterize plasma conditions and to gauge opacity calculations. Recent precision measurements have revealed deficits in our understanding of continuum lowering in dense hot plasmas. However, these investigations have so far been limited to IPD in strongly coupled but nondegenerate plasmas. Here, we report a first-principles study of the K-edge shifting in both strongly coupled and fully degenerate carbon plasmas, with quantum molecular dynamics (QMD) calculations basedmore » on the all-electron density-functional theory (DFT). The resulted K-edge shifting versus plasma density, as a probe to the continuum lowering and the Fermi-surface rising, is found to be significantly different from predictions of existing IPD models. In contrast, a simple model of “single atom in box” (SAIB), developed in this work, accurately predicts K-edge locations as what ab-initio calculations provide.« less

The application of the mesh-free method in the numerical simulations of the higher-order continuum structures

DOE Office of Scientific and Technical Information (OSTI.GOV)

Sun, Yuzhou, E-mail: yuzhousun@126.com; Chen, Gensheng; Li, Dongxia

2016-06-08

This paper attempts to study the application of mesh-free method in the numerical simulations of the higher-order continuum structures. A high-order bending beam considers the effect of the third-order derivative of deflections, and can be viewed as a one-dimensional higher-order continuum structure. The moving least-squares method is used to construct the shape function with the high-order continuum property, the curvature and the third-order derivative of deflections are directly interpolated with nodal variables and the second- and third-order derivative of the shape function, and the mesh-free computational scheme is establish for beams. The coupled stress theory is introduced to describe themore » special constitutive response of the layered rock mass in which the bending effect of thin layer is considered. The strain and the curvature are directly interpolated with the nodal variables, and the mesh-free method is established for the layered rock mass. The good computational efficiency is achieved based on the developed mesh-free method, and some key issues are discussed.« less

Continuum Lowering and Fermi-Surface Rising in Strongly Coupled and Degenerate Plasmas

DOE PAGES

Hu, S. X.

2017-08-10

Here, continuum lowering is a well-known and important physics concept that describes the ionization potential depression (IPD) in plasmas caused by thermal-/pressure-induced ionization of outer-shell electrons. The existing IPD models are often used to characterize plasma conditions and to gauge opacity calculations. Recent precision measurements have revealed deficits in our understanding of continuum lowering in dense hot plasmas. However, these investigations have so far been limited to IPD in strongly coupled but nondegenerate plasmas. Here, we report a first-principles study of the K-edge shifting in both strongly coupled and fully degenerate carbon plasmas, with quantum molecular dynamics (QMD) calculations basedmore » on the all-electron density-functional theory (DFT). The resulted K-edge shifting versus plasma density, as a probe to the continuum lowering and the Fermi-surface rising, is found to be significantly different from predictions of existing IPD models. In contrast, a simple model of “single atom in box” (SAIB), developed in this work, accurately predicts K-edge locations as what ab-initio calculations provide.« less

Discrete Calculus as a Bridge between Scales

NASA Astrophysics Data System (ADS)

Degiuli, Eric; McElwaine, Jim

2012-02-01

Understanding how continuum descriptions of disordered media emerge from the microscopic scale is a fundamental challenge in condensed matter physics. In many systems, it is necessary to coarse-grain balance equations at the microscopic scale to obtain macroscopic equations. We report development of an exact, discrete calculus, which allows identification of discrete microscopic equations with their continuum equivalent [1]. This allows the application of powerful techniques of calculus, such as the Helmholtz decomposition, the Divergence Theorem, and Stokes' Theorem. We illustrate our results with granular materials. In particular, we show how Newton's laws for a single grain reproduce their continuum equivalent in the calculus. This allows introduction of a discrete Airy stress function, exactly as in the continuum. As an application of the formalism, we show how these results give the natural mean-field variation of discrete quantities, in agreement with numerical simulations. The discrete calculus thus acts as a bridge between discrete microscale quantities and continuous macroscale quantities. [4pt] [1] E. DeGiuli & J. McElwaine, PRE 2011. doi: 10.1103/PhysRevE.84.041310

Effect of nonlinearity in hybrid kinetic Monte Carlo-continuum models.

PubMed

Balter, Ariel; Lin, Guang; Tartakovsky, Alexandre M

2012-01-01

Recently there has been interest in developing efficient ways to model heterogeneous surface reactions with hybrid computational models that couple a kinetic Monte Carlo (KMC) model for a surface to a finite-difference model for bulk diffusion in a continuous domain. We consider two representative problems that validate a hybrid method and show that this method captures the combined effects of nonlinearity and stochasticity. We first validate a simple deposition-dissolution model with a linear rate showing that the KMC-continuum hybrid agrees with both a fully deterministic model and its analytical solution. We then study a deposition-dissolution model including competitive adsorption, which leads to a nonlinear rate, and show that in this case the KMC-continuum hybrid and fully deterministic simulations do not agree. However, we are able to identify the difference as a natural result of the stochasticity coming from the KMC surface process. Because KMC captures inherent fluctuations, we consider it to be more realistic than a purely deterministic model. Therefore, we consider the KMC-continuum hybrid to be more representative of a real system.

Effect of Nonlinearity in Hybrid Kinetic Monte Carlo-Continuum Models

DOE Office of Scientific and Technical Information (OSTI.GOV)

Balter, Ariel I.; Lin, Guang; Tartakovsky, Alexandre M.

2012-04-23

Recently there has been interest in developing efficient ways to model heterogeneous surface reactions with hybrid computational models that couple a KMC model for a surface to a finite difference model for bulk diffusion in a continuous domain. We consider two representative problems that validate a hybrid method and also show that this method captures the combined effects of nonlinearity and stochasticity. We first validate a simple deposition/dissolution model with a linear rate showing that the KMC-continuum hybrid agrees with both a fully deterministic model and its analytical solution. We then study a deposition/dissolution model including competitive adsorption, which leadsmore » to a nonlinear rate, and show that, in this case, the KMC-continuum hybrid and fully deterministic simulations do not agree. However, we are able to identify the difference as a natural result of the stochasticity coming from the KMC surface process. Because KMC captures inherent fluctuations, we consider it to be more realistic than a purely deterministic model. Therefore, we consider the KMC-continuum hybrid to be more representative of a real system.« less

Practice Report / Bericht aus der Praxis: Peer teaching: From method to philosophy.

PubMed

Ten Cate, Olle

2017-11-01

Peer teaching or peer-assisted learning is a popular topic in the medical education literature. While not one method of education, a categorization is possible according to (a) the developmental distance between learner and peer teacher, (b) the scale or group size of learners in peer teaching arrangements and (c) the extent of formality or structure of the arrangement. That yields many different forms of peer teaching. Viewing peer teaching as a multifaceted method shows several benefits. On a deeper level however peer teaching may be viewed as a philosophy of medical education that has historical roots but aligns well with current thinking of teaching and learning across the continuum of medical education. Copyright © 2017. Published by Elsevier GmbH.

Through the eyes of professional developers: Understanding the design of learning experiences for science teachers

NASA Astrophysics Data System (ADS)

Higgins, Tara Eileen

Professional development is important for improving teacher practice and student learning, particularly in inquiry-oriented and technology-enhanced science instruction. This study examines professional developers' practices and their impact on teachers' classroom instruction and student achievement. It analyzes professional developers designing and implementing a five-year professional development program designed to support middle school science teachers. The professional developers are four university-based researchers who worked with sixteen science teachers over three years, setting program goals, facilitating workshops, providing in-classroom support for teachers, and continually refining the program. The analysis is guided by the knowledge integration perspective, a sociocognitive framework for understanding how teachers and professional developers integrate their ideas about teaching and learning. The study investigates the professional developers' goals and teachers' interpretations of those goals. It documents how professional developers plan teacher learning experiences and explores the connection between professional development activities and teachers' classroom practice. Results are based on two rounds of interviews with professional developers, audio recordings of professional developers' planning meetings and videotaped professional development activities. Data include classroom observations, teacher interviews, teacher reflections during professional development activities, and results from student assessments. The study shows the benefit of a professional development approach that relies on an integrated cycle of setting goals, understanding teachers' interpretations, and refining implementation. The professional developers based their design on making inquiry and technology accessible, situating professional development in teachers' work, supporting collaboration, and sustaining learning. The findings reflect alignment of the design goals with the perspective guiding the curriculum design, and consider multiple goals for student and teacher learning. The study has implications for professional development design, particularly in supporting inquiry-oriented science and technology-enhanced instruction. Effective professional developers formulate coherent conceptions of program goals, use evidence of teacher outcomes to refine their goals and practices, and connect student and teacher learning. This study illustrates the value of research on the individuals who design and lead professional development programs.

Classroom Teacher Candidates' Perceptions of Teacher Self-Efficacy in Developing Students' Reading, Writing and Verbal Skills: Scale Development Study

ERIC Educational Resources Information Center

Canbulat, Ayse Nur Kutluca

2017-01-01

This work uses exploratory and confirmatory factor analyses to study Verbal Skills Development Teacher Self-Efficacy Scale (VSDTS), Reading Skills Development Teacher Self-Efficacy Scale (RSDTS) and Writing Skills Development Teacher Self-Efficacy Scale (WSDTS) developed to identify classroom teacher candidates' perceptions of teacher…

PACCE: Perl Algorithm to Compute Continuum and Equivalent Widths

NASA Astrophysics Data System (ADS)

Riffel, Rogério; Borges Vale, Tibério

2011-05-01

PACCE (Perl Algorithm to Compute continuum and Equivalent Widths) computes continuum and equivalent widths. PACCE is able to determine mean continuum and continuum at line center values, which are helpful in stellar population studies, and is also able to compute the uncertainties in the equivalent widths using photon statistics.

Numerical investigation of non-perturbative kinetic effects of energetic particles on toroidicity-induced Alfvén eigenmodes in tokamaks and stellarators

DOE Office of Scientific and Technical Information (OSTI.GOV)

Slaby, Christoph; Könies, Axel; Kleiber, Ralf

2016-09-15

The resonant interaction of shear Alfvén waves with energetic particles is investigated numerically in tokamak and stellarator geometry using a non-perturbative MHD-kinetic hybrid approach. The focus lies on toroidicity-induced Alfvén eigenmodes (TAEs), which are most easily destabilized by a fast-particle population in fusion plasmas. While the background plasma is treated within the framework of an ideal-MHD theory, the drive of the fast particles, as well as Landau damping of the background plasma, is modelled using the drift-kinetic Vlasov equation without collisions. Building on analytical theory, a fast numerical tool, STAE-K, has been developed to solve the resulting eigenvalue problem usingmore » a Riccati shooting method. The code, which can be used for parameter scans, is applied to tokamaks and the stellarator Wendelstein 7-X. High energetic-ion pressure leads to large growth rates of the TAEs and to their conversion into kinetically modified TAEs and kinetic Alfvén waves via continuum interaction. To better understand the physics of this conversion mechanism, the connections between TAEs and the shear Alfvén wave continuum are examined. It is shown that, when energetic particles are present, the continuum deforms substantially and the TAE frequency can leave the continuum gap. The interaction of the TAE with the continuum leads to singularities in the eigenfunctions. To further advance the physical model and also to eliminate the MHD continuum together with the singularities in the eigenfunctions, a fourth-order term connected to radiative damping has been included. The radiative damping term is connected to non-ideal effects of the bulk plasma and introduces higher-order derivatives to the model. Thus, it has the potential to substantially change the nature of the solution. For the first time, the fast-particle drive, Landau damping, continuum damping, and radiative damping have been modelled together in tokamak- as well as in stellarator geometry.« less

Ensuring congruency in multiscale modeling: towards linking agent based and continuum biomechanical models of arterial adaptation.

PubMed

Hayenga, Heather N; Thorne, Bryan C; Peirce, Shayn M; Humphrey, Jay D

2011-11-01

There is a need to develop multiscale models of vascular adaptations to understand tissue-level manifestations of cellular level mechanisms. Continuum-based biomechanical models are well suited for relating blood pressures and flows to stress-mediated changes in geometry and properties, but less so for describing underlying mechanobiological processes. Discrete stochastic agent-based models are well suited for representing biological processes at a cellular level, but not for describing tissue-level mechanical changes. We present here a conceptually new approach to facilitate the coupling of continuum and agent-based models. Because of ubiquitous limitations in both the tissue- and cell-level data from which one derives constitutive relations for continuum models and rule-sets for agent-based models, we suggest that model verification should enforce congruency across scales. That is, multiscale model parameters initially determined from data sets representing different scales should be refined, when possible, to ensure that common outputs are consistent. Potential advantages of this approach are illustrated by comparing simulated aortic responses to a sustained increase in blood pressure predicted by continuum and agent-based models both before and after instituting a genetic algorithm to refine 16 objectively bounded model parameters. We show that congruency-based parameter refinement not only yielded increased consistency across scales, it also yielded predictions that are closer to in vivo observations.

Calculating pKa values for substituted phenols and hydration energies for other compounds with the first-order Fuzzy-Border continuum solvation model

PubMed Central

Sharma, Ity; Kaminski, George A.

2012-01-01

We have computed pKa values for eleven substituted phenol compounds using the continuum Fuzzy-Border (FB) solvation model. Hydration energies for 40 other compounds, including alkanes, alkenes, alkynes, ketones, amines, alcohols, ethers, aromatics, amides, heterocycles, thiols, sulfides and acids have been calculated. The overall average unsigned error in the calculated acidity constant values was equal to 0.41 pH units and the average error in the solvation energies was 0.076 kcal/mol. We have also reproduced pKa values of propanoic and butanoic acids within ca. 0.1 pH units from the experimental values by fitting the solvation parameters for carboxylate ion carbon and oxygen atoms. The FB model combines two distinguishing features. First, it limits the amount of noise which is common in numerical treatment of continuum solvation models by using fixed-position grid points. Second, it employs either second- or first-order approximation for the solvent polarization, depending on a particular implementation. These approximations are similar to those used for solute and explicit solvent fast polarization treatment which we developed previously. This article describes results of employing the first-order technique. This approximation places the presented methodology between the Generalized Born and Poisson-Boltzmann continuum solvation models with respect to their accuracy of reproducing the many-body effects in modeling a continuum solvent. PMID:22815192

Dissipation consistent fabric tensor definition from DEM to continuum for granular media

NASA Astrophysics Data System (ADS)

Li, X. S.; Dafalias, Y. F.

2015-05-01

In elastoplastic soil models aimed at capturing the impact of fabric anisotropy, a necessary ingredient is a measure of anisotropic fabric in the form of an evolving tensor. While it is possible to formulate such a fabric tensor based on indirect phenomenological observations at the continuum level, it is more effective and insightful to have the tensor defined first based on direct particle level microstructural observations and subsequently deduce a corresponding continuum definition. A practical means able to provide such observations, at least in the context of fabric evolution mechanisms, is the discrete element method (DEM). Some DEM defined fabric tensors such as the one based on the statistics of interparticle contact normals have already gained widespread acceptance as a quantitative measure of fabric anisotropy among researchers of granular material behavior. On the other hand, a fabric tensor in continuum elastoplastic modeling has been treated as a tensor-valued internal variable whose evolution must be properly linked to physical dissipation. Accordingly, the adaptation of a DEM fabric tensor definition to a continuum constitutive modeling theory must be thermodynamically consistent in regards to dissipation mechanisms. The present paper addresses this issue in detail, brings up possible pitfalls if such consistency is violated and proposes remedies and guidelines for such adaptation within a recently developed Anisotropic Critical State Theory (ACST) for granular materials.

A geohydrologic continuum theory for the spatial and temporal evolution of marsh-estuarine ecosystems

NASA Astrophysics Data System (ADS)

Dame, R.; Childers, D.; Koepfler, E.

Using ecosystem development theory and the River Continuum Concept as starting points, we present a new holistic theory to explain the spatial and temporal behaviour of marsh-estuarine ecosystems Along the marine-estuarine-freshwater gradient in response to sea-level rise. In this theory, a geohydrologic continuum represented by tidal channel provides a predictable physical model of how the marsh-estuarine ecosystem adapts until there is a change of state. North Inlet, South Carolina is used as an example of this marsh-estuarine continuum. Mature creeks are at the ocean-estuary interface and are strongly influenced by marine factors. Further into the estuary, less and less mature creeks are encountered which are dominated by smaller scale spatial and temporal controls such as oyster reefs. Immature or ephemeral creeks import both particulate and dissolved materials, while mature creeks export both forms of nutrients. Mid-aged creeks appear to take up particulate materials and release dissolved constituents. Ultimately, the continuum reaches the fresh-saltwater interface where a very young estuarine ecosystem invades a more mature type, under the influence of disturbance. Our new explanation satisfies most criteria for a good theory by being internally consistent to the location specified, generating testable hypothesis, not blindly adapting existing theories, agreeing with known properties of the ecosystem described and by generating new invigorating discussion within the scientific community.

A continuum model for dynamic analysis of the Space Station

NASA Technical Reports Server (NTRS)

Thomas, Segun

1989-01-01

Dynamic analysis of the International Space Station using MSC/NASTRAN had 1312 rod elements, 62 beam elements, 489 nodes and 1473 dynamic degrees of freedom. A realtime, man-in-the-loop simulation of such a model is impractical. This paper discusses the mathematical model for realtime dynamic simulation of the Space Station. Several key questions in structures and structural dynamics are addressed. First, to achieve a significant reduction in the number of dynamic degrees of freedom, a continuum equivalent representation of the Space Station truss structure which accounted for the unsymmetry of the basic configuration and resulted in the coupling of extensional and transverse deformation, is developed. Next, dynamic equations for the continuum equivalent of the Space Station truss structure are formulated using a matrix version of Kane's dynamical equations. Flexibility is accounted for by using a theory that accommodates extension, bending in two principal planes and shear displacement. Finally, constraint equations suitable for dynamic analysis of flexible bodies with closed loop configuration are developed and solution of the resulting system of equations is based on the zero eigenvalue theorem.

PACS: acceptance test, quality control, warranty, and maintenance continuum

NASA Astrophysics Data System (ADS)

Romlein, John R.; Norton, Gary S.; Lyche, David K.; Richardson, Ronald R., Jr.

1999-07-01

As PACS gain greater acceptance and use in medical facilities the question of life cycle management must be addressed in terms that relate to the common business practices for medical information system and medical devices. The issues in life cycle management of such a system are relatively new to the industry. Increased use of PACS within the medical community requires that standardized life cycle management practices by developed and implemented. This paper develops a new of life cycle issues as cyclic and related events that are not only manageable, but also predictable in terms, of, frequency, duration data content, data exchange, potential outcomes, staffing requirement, documentation, and staff interaction. This view is presented as a continuum that begins at the acceptance testing of a PACS and continues throughout its life cycle. The continuum incorporates the required relationship between quality control testing and maintenance actions during warranty period and the maintenance years. Interrelated cyclic events are described that bind these processes together and provide a basis for long-term proactive management of PACS in a medical environment.

MaMiCo: Software design for parallel molecular-continuum flow simulations

NASA Astrophysics Data System (ADS)

Neumann, Philipp; Flohr, Hanno; Arora, Rahul; Jarmatz, Piet; Tchipev, Nikola; Bungartz, Hans-Joachim

2016-03-01

The macro-micro-coupling tool (MaMiCo) was developed to ease the development of and modularize molecular-continuum simulations, retaining sequential and parallel performance. We demonstrate the functionality and performance of MaMiCo by coupling the spatially adaptive Lattice Boltzmann framework waLBerla with four molecular dynamics (MD) codes: the light-weight Lennard-Jones-based implementation SimpleMD, the node-level optimized software ls1 mardyn, and the community codes ESPResSo and LAMMPS. We detail interface implementations to connect each solver with MaMiCo. The coupling for each waLBerla-MD setup is validated in three-dimensional channel flow simulations which are solved by means of a state-based coupling method. We provide sequential and strong scaling measurements for the four molecular-continuum simulations. The overhead of MaMiCo is found to come at 10%-20% of the total (MD) runtime. The measurements further show that scalability of the hybrid simulations is reached on up to 500 Intel SandyBridge, and more than 1000 AMD Bulldozer compute cores.

The Continuum of Health Professions

PubMed Central

Jensen, Clyde B.

2015-01-01

The large number of health care professions with overlapping scopes of practice is intimidating to students, confusing to patients, and frustrating to policymakers. As abundant and diverse as the hundreds of health care professions are, they possess sufficient numbers of common characteristics to warrant their placement on a common continuum of health professions that permits methodical comparisons. From 2009–2012, the author developed and delivered experimental courses at 2 community colleges for the purposes of creating and validating a novel method for comparing health care professions. This paper describes the bidirectional health professions continuum that emerged from these courses and its potential value in helping students select a health care career, motivating health care providers to seek interprofessional collaboration, assisting patients with the selection of health care providers, and helping policymakers to better understand the health care professions they regulate. PMID:26770147

Spin-Orbital Excitation Continuum and Anomalous Electron-Phonon Interaction in the Mott Insulator LaTiO3

NASA Astrophysics Data System (ADS)

Ulrich, C.; Khaliullin, G.; Guennou, M.; Roth, H.; Lorenz, T.; Keimer, B.

2015-10-01

Raman scattering experiments on stoichiometric, Mott-insulating LaTiO3 over a wide range of excitation energies reveal a broad electronic continuum which is featureless in the paramagnetic state, but develops a gap of ˜800 cm-1 upon cooling below the Néel temperature TN=146 K . In the antiferromagnetic state, the spectral weight below the gap is transferred to well-defined spectral features due to spin and orbital excitations. Low-energy phonons exhibit pronounced Fano anomalies indicative of strong interaction with the electron system for T >TN , but become sharp and symmetric for T

Wave-packet continuum-discretization approach to ion-atom collisions including rearrangement: Application to differential ionization in proton-hydrogen scattering

NASA Astrophysics Data System (ADS)

Abdurakhmanov, I. B.; Bailey, J. J.; Kadyrov, A. S.; Bray, I.

2018-03-01

In this work, we develop a wave-packet continuum-discretization approach to ion-atom collisions that includes rearrangement processes. The total scattering wave function is expanded using a two-center basis built from wave-packet pseudostates. The exact three-body Schrödinger equation is converted into coupled-channel differential equations for time-dependent expansion coefficients. In the asymptotic region these time-dependent coefficients represent transition amplitudes for all processes including elastic scattering, excitation, ionization, and electron capture. The wave-packet continuum-discretization approach is ideal for differential ionization studies as it allows one to generate pseudostates with arbitrary energies and distribution. The approach is used to calculate the double differential cross section for ionization in proton collisions with atomic hydrogen. Overall good agreement with experiment is obtained for all considered cases.

On the use of reverse Brownian motion to accelerate hybrid simulations

DOE Office of Scientific and Technical Information (OSTI.GOV)

Bakarji, Joseph; Tartakovsky, Daniel M., E-mail: tartakovsky@stanford.edu

Multiscale and multiphysics simulations are two rapidly developing fields of scientific computing. Efficient coupling of continuum (deterministic or stochastic) constitutive solvers with their discrete (stochastic, particle-based) counterparts is a common challenge in both kinds of simulations. We focus on interfacial, tightly coupled simulations of diffusion that combine continuum and particle-based solvers. The latter employs the reverse Brownian motion (rBm), a Monte Carlo approach that allows one to enforce inhomogeneous Dirichlet, Neumann, or Robin boundary conditions and is trivially parallelizable. We discuss numerical approaches for improving the accuracy of rBm in the presence of inhomogeneous Neumann boundary conditions and alternative strategiesmore » for coupling the rBm solver with its continuum counterpart. Numerical experiments are used to investigate the convergence, stability, and computational efficiency of the proposed hybrid algorithm.« less

Evolution of plastic anisotropy for high-strain-rate computations

DOE Office of Scientific and Technical Information (OSTI.GOV)

Schiferl, S.K.; Maudlin, P.J.

1994-12-01

A model for anisotropic material strength, and for changes in the anisotropy due to plastic strain, is described. This model has been developed for use in high-rate, explicit, Lagrangian multidimensional continuum-mechanics codes. The model handles anisotropies in single-phase materials, in particular the anisotropies due to crystallographic texture--preferred orientations of the single-crystal grains. Textural anisotropies, and the changes in these anisotropies, depend overwhelmingly no the crystal structure of the material and on the deformation history. The changes, particularly for a complex deformations, are not amenable to simple analytical forms. To handle this problem, the material model described here includes a texturemore » code, or micromechanical calculation, coupled to a continuum code. The texture code updates grain orientations as a function of tensor plastic strain, and calculates the yield strength in different directions. A yield function is fitted to these yield points. For each computational cell in the continuum simulation, the texture code tracks a particular set of grain orientations. The orientations will change due to the tensor strain history, and the yield function will change accordingly. Hence, the continuum code supplies a tensor strain to the texture code, and the texture code supplies an updated yield function to the continuum code. Since significant texture changes require relatively large strains--typically, a few percent or more--the texture code is not called very often, and the increase in computer time is not excessive. The model was implemented, using a finite-element continuum code and a texture code specialized for hexagonal-close-packed crystal structures. The results for several uniaxial stress problems and an explosive-forming problem are shown.« less

Classroom-Level Teacher Professional Development and Satisfaction: Teachers Learn in the Context of Classroom-Level Curriculum Development

ERIC Educational Resources Information Center

Shawer, Saad

2010-01-01

This qualitative study examined the impact of classroom-level teacher professional development (CTPD) and curriculum transmission on teacher professional development and satisfaction. Based on work with English-as-a-foreign-language college teachers and students, data analysis showed that CTPD significantly improved student-teacher subject,…

Relationship between women's characteristics and continuum of care for maternal health in Kenya: Complex survey analysis using structural equation modeling.

PubMed

Owili, Patrick Opiyo; Muga, Miriam Adoyo; Chou, Yiing-Jenq; Hsu, Yi-Hsin Elsa; Huang, Nicole; Chien, Li-Yin

2017-09-01

The objective of this study was to understand and estimate the complex relationships in the continuum of care for maternal health to provide information to improve maternal and newborn health outcomes. Women (n = 4,082) aged 15-49 years in the 2008/2009 Kenya Demographic and Health Survey data were used to explore the complex relationships in the continuum of care for maternal health (i.e., before, during, and after delivery) using structural equation modeling. Results showed that the use of antenatal care was significantly positively related to the use of delivery care (β = 0.06; adjusted odds ratio [AOR] = 1.06; 95% confidence interval [CI]: 1.02-1.10) but not postnatal care, while delivery care was associated with postnatal care (β = 0.68; AOR = 1.97; 95% CI: 1.75-2.22). Socioeconomic status was significantly related to all elements in the continuum of care for maternal health; barriers to delivery of care and personal characteristics were only associated with the use of delivery care (β = 0.34; AOR = 1.40; 95% CI: 1.30-1.52) and postnatal care (β = 0.03; AOR = 1.03; 95% CI: 1.01-1.05), respectively. The three periods of maternal health care were related to each other. Developing a referral system of continuity of care is critical in the Sustainable Development Goals era.

The Development of an Educational Continuum to Meet Agricultural Workforce Needs

DOE Office of Scientific and Technical Information (OSTI.GOV)

Burleson, Sarah; Rubenstein, Eric; Thoron, Andrew

2012-02-07

The poster explains the basic issues of a development of an educational continuum to meet agricultural workforce needs of Hendry County. The community needs include primarily jobs within the community, training of local biofuels workforce, education for profession-bound students, services for biofuels entrepreneurs, private farming system alternatives and an improvement of overall education system. These needs are to be met in Hendry County on various levels by its secondary education institutions, Edison State College and University of Florida. Each of these parties has a specific role in the overall education and training process, while the outcome of each is amore » local educated and trained workforce.« less

Mental health interventions in schools 1

PubMed Central

Fazel, Mina; Hoagwood, Kimberly; Stephan, Sharon; Ford, Tamsin

2015-01-01

Mental health services embedded within school systems can create a continuum of integrative care that improves both mental health and educational attainment for children. To strengthen this continuum, and for optimum child development, a reconfiguration of education and mental health systems to aid implementation of evidence-based practice might be needed. Integrative strategies that combine classroom-level and student-level interventions have much potential. A robust research agenda is needed that focuses on system-level implementation and maintenance of interventions over time. Both ethical and scientific justifications exist for integration of mental health and education: integration democratises access to services and, if coupled with use of evidence-based practices, can promote the healthy development of children. PMID:26114092

Building professional identity as computer science teachers: Supporting high school computer science teachers through reflection and community building

NASA Astrophysics Data System (ADS)

Ni, Lijun

Computing education requires qualified computing teachers. The reality is that too few high schools in the U.S. have computing/computer science teachers with formal computer science (CS) training, and many schools do not have CS teacher at all. Moreover, teacher retention rate is often low. Beginning teacher attrition rate is particularly high in secondary education. Therefore, in addition to the need for preparing new CS teachers, we also need to support those teachers we have recruited and trained to become better teachers and continue to teach CS. Teacher education literature, especially teacher identity theory, suggests that a strong sense of teacher identity is a major indicator or feature of committed, qualified teachers. However, under the current educational system in the U.S., it could be challenging to establish teacher identity for high school (HS) CS teachers, e.g., due to a lack of teacher certification for CS. This thesis work centers upon understanding the sense of identity HS CS teachers hold and exploring ways of supporting their identity development through a professional development program: the Disciplinary Commons for Computing Educators (DCCE). DCCE has a major focus on promoting reflection on teaching practice and community building. With scaffolded activities such as course portfolio creation, peer review and peer observation among a group of HS CS teachers, it offers opportunities for CS teachers to explicitly reflect on and narrate their teaching, which is a central process of identity building through their participation within the community. In this thesis research, I explore the development of CS teacher identity through professional development programs. I first conducted an interview study with local HS CS teachers to understand their sense of identity and factors influencing their identity formation. I designed and enacted the professional program (DCCE) and conducted case studies with DCCE participants to understand how their participation in DCCE supported their identity development as a CS teacher. Overall, I found that these CS teachers held different teacher identities with varied features related to their motivation and commitment in teaching CS. I identified four concrete factors that contributed to these teachers' sense of professional identity as a CS teacher. I addressed some of these issues for CS teachers' identity development (especially the issue of lacking community) through offering professional development opportunities with a major focus on teacher reflection and community building. Results from this work indicate a potential model of supporting CS identity development, mapping the characteristics of the professional development program with particular facets of CS teacher identity. This work offers further understanding of the unique challenges that current CS teachers are facing in their CS teaching, as well as the challenges of preparing and supporting CS teachers. My findings also suggest guidelines for teacher education and professional development program design and implementation for building committed, qualified CS teachers in ways that promote the development of CS teacher identity.

Principal-Teacher Interactions and Teacher Leadership Development: Beginning Teachers' Perspectives

ERIC Educational Resources Information Center

Szeto, Elson; Cheng, Annie Yan-Ni

2018-01-01

Teacher leadership lies at the heart of school improvement. Leadership development among beginning teachers, however, is often neglected. This paper examines the role of principal-teacher interactions in the leadership development of a group of beginning teachers. Using a case study design, interviews were conducted and documentary evidence was…

Identity Development: What I Notice about Myself as a Teacher

ERIC Educational Resources Information Center

Ó Gallchóir, Ciarán; O'Flaherty, Joanne; Hinchion, Carmel

2018-01-01

Teacher identity has been recognised as critical to the practice and development of teachers. However, there remains a paucity of scholarship capturing the voice of pre-service teachers' meaning making of their own development as teachers during initial teacher education. This paper sets out to explore seven pre-service teachers' meaning making of…

Understanding Teacher Development.

ERIC Educational Resources Information Center

Hargreaves, Andy, Ed.; Fullan, Michael G., Ed.

The 12 chapters in this book interpret teacher development in relation to self-development, teacher reflection, teacher biographies, cultures of teaching, teacher careers, teachers' work, gender identity, and classroom practice. The collection begins with an introductory chapter (Andy Hargreaves and Michael G. Fullan) and continues with 11…

Classroom-Level Curriculum Development: EFL Teachers as Curriculum-Developers, Curriculum-Makers and Curriculum-Transmitters

ERIC Educational Resources Information Center

Shawer, Saad F.

2010-01-01

This qualitative study aimed to explore teacher curriculum approaches and the strategies attached to each approach because they influence the taught curriculum, teacher development and student learning. The study was therefore grounded in teacher curriculum development, curriculum implementation, teacher development, student cognitive and…

Student Teachers' Perceptions of Cooperating Teachers as Teacher Educators: Development of Standards Based Scales

ERIC Educational Resources Information Center

Holbert, Romena M. Garrett

2011-01-01

Cooperating teachers play important roles in student teachers' development as educators. The purpose of this study was to develop a measure that enables systematic investigation of the actions and interactions of cooperating teachers during student teaching. Three sets of educational standards lent focus to this work. The measures developed were…

A Campus-Wide Study of STEM Courses: New Perspectives on Teaching Practices and Perceptions

PubMed Central

Vinson, Erin L.; Smith, Jeremy A.; Lewin, Justin D.; Stetzer, MacKenzie R.

2014-01-01

At the University of Maine, middle and high school science, technology, engineering, and mathematics (STEM) teachers observed 51 STEM courses across 13 different departments and collected information on the active-engagement nature of instruction. The results of these observations show that faculty members teaching STEM courses cannot simply be classified into two groups, traditional lecturers or instructors who teach in a highly interactive manner, but instead exhibit a continuum of instructional behaviors between these two classifications. In addition, the observation data reveal that student behavior differs greatly in classes with varied levels of lecture. Although faculty members who teach large-enrollment courses are more likely to lecture, we also identified instructors of several large courses using interactive teaching methods. Observed faculty members were also asked to complete a survey about how often they use specific teaching practices, and we find that faculty members are generally self-aware of their own practices. Taken together, these findings provide comprehensive information about the range of STEM teaching practices at a campus-wide level and how such information can be used to design targeted professional development for faculty. PMID:25452485

NREL Analysis: Reimagining What's Possible for Clean Energy - Continuum

Science.gov Websites

Analysis Helps Enable the Energy System of the Future NREL Helps Countries Build Stronger Economies with Low-Emission Development NREL Helps Countries Build Stronger Economies with Low-Emission Development

Ash Dispersal in Planetary Atmospheres: Continuum vs. Non-continuum Effects

NASA Astrophysics Data System (ADS)

Fagents, S. A.; Baloga, S. M.; Glaze, L. S.

2013-12-01

The dispersal of ash from a volcanic vent on any given planet is dictated by particle properties (density, shape, and size distribution), the intensity of the eruptive source, and the characteristics of the planetary environment (atmospheric structure, wind field, and gravity) into which the ash is erupted. Relating observations of potential pyroclastic deposits to source locations and eruption conditions requires a detailed quantitative understanding of the settling rates of individual particles under changing ambient conditions. For atmospheres that are well described by continuum mechanics, the conventional Newtonian description of particle motion allows particle settling velocities to be related to particle characteristics via a drag coefficient. However, under rarefied atmospheric conditions (i.e., on Mars and at high altitude on Earth), non-continuum effects become important for ash-sized particles, and an equation of motion based on statistical mechanics is required for calculating particle motion. We have developed a rigorous new treatment of particle settling under variable atmospheric conditions and applied it to Earth and Mars. When non-continuum effects are important (as dictated by the mean free path of atmospheric gas relative to the particle size), fall velocities are greater than those calculated by continuum mechanics. When continuum conditions (i.e., higher atmospheric densities) are reached during descent, our model switches to a conventional formulation that determines the appropriate drag coefficient as the particle transits varying atmospheric properties. The variation of settling velocity with altitude allows computation of particle trajectories, fall durations and downwind dispersal. Our theoretical and numerical analyses show that several key, competing factors strongly influence the downwind trajectories of ash particles and the extents of the resulting deposits. These factors include: the shape of the particles (non-spherical particles fall more slowly than spherical particle shapes commonly adopted in settling models); the formation of particle aggregates, which enhances settling rates; and the lagging of particle motion behind the ambient wind field, which results in less widely dispersed deposits. Above all, any particles experiencing non-continuum effects settle faster and are less widely dispersed than particles falling in an entirely continuum regime. Our model results demonstrate the complex interplay of these factors in the Martian environment, and our approach provides a basis for relating deposits observed in planetary datasets to candidate volcanic sources and eruption conditions. This allows for a critical reassessment of the potential for explosive volcanism to contribute to extremely widespread, fine-grained, layered deposits such as the Medusae Fossae Formation.

Role of Teacher Educational Institutions in Developing Personality of Student Teachers

ERIC Educational Resources Information Center

Prakash, Srinivasan; Xavier S. J., S. Amaladoss

2014-01-01

Teacher Education is an integral part of any educational system. It should provide a platform in developing the holistic personality of a student teacher. This paper reports on personality of student teachers and the role of Teacher Educational institutions in developing it. The sample consists of 1,080 student teachers of Madurai revenue…

Role of Teacher Educational Institutions in Developing Personality of Student Teachers

ERIC Educational Resources Information Center

Prakash, S.; Xavier, S. Amaladoss

2014-01-01

Teacher Education is an integral part of any educational system. It should provide a platform in developing the holistic personality of a student teacher. This paper reports on personality of student teachers and the role of Teacher Educational institutions in developing it. The sample consists of 1080 student teachers of Madurai revenue district.…

Integrating Research, Education, Outreach and Communication Through Storytelling: A Case Study in Progress

NASA Astrophysics Data System (ADS)

McCaffrey, M. S.; Ledley, T.; Manduca, C.; Salmon, R.

2006-12-01

In order to provide a meaningful context for non-technical users to be able to decipher and comprehend research data, it is necessary to provide background into the process involved. Storytelling can provide the narrative description that brings data alive by showing the 'Who' (providing human interest, education and training background, and career opportunities information), 'What' (focusing on discipline, field of study, research questions, and significance), 'Where' (geographic location(s), logistics involved in getting there, and elevation or depth), 'When' (time(s) of day, year data collected, and temporal scale data focus on), 'Why' (why is the data important intellectually as well as in the broader, societal context) and especially the 'How' (what tools, technology, mathematics, and statistics are used to collect, archive, and analyze data). The upcoming International Polar Year (IPY), running from March 2007 to March 2009, builds on prior polar research and IPYs, and offers a unique opportunity to showcase the process of data collection and analysis in a compelling human context. Internationally, the IPY Education, Outreach and Communication (EOC) subcommittee is seeking to integrate the EOC continuum and when appropriate repurpose information about specific research projects. For example, descriptions of projects designed initially for media purposes may also serve as the "at a glance" overview of a project that can then link to more detailed narrative descriptions of the projects, augmented with video and audio clips, web-links to related background information and relevant curriculum, and ultimately to the data itself, well scaffolded with relevant supporting materials and tools. In the United States, plans are underway for developing a suite of data stories that provide the narrative background of a project and can be used in museum kiosks and other informal science settings, data sheets, that provide teachers with an overview of the data, and curriculum and training for teachers using the model developed by the Earth Exploration Toolkit.

Frequency chirpings in Alfven continuum

NASA Astrophysics Data System (ADS)

Wang, Ge; Berk, Herb; Breizman, Boris; Zheng, Linjin

2017-10-01

We have used a self-consistent mapping technique to describe both the nonlinear wave-energetic particle resonant interaction and its spatial mode structure that depends upon the resonant energetic particle pressure. At the threshold for the onset of the energetic particle mode (EPM), strong chirping emerges in the lower continuum close to the TAE gap and then, driven by strong continuum damping, chirps rapidly to lower frequencies in the Alfven continuum. An adiabatic theory was developed that accurately replicated the results from the simulation where the nonlinearity was only due to the EPM resonant particles. The results show that the EPM-trapped particles have their action conserved during the time of rapid chirping. This adiabaticity enabled wave trapped particles to be confined within their separatrix, and produce even larger resonant structures, that can produce a large amplitude mode far from linearly predicted frequencies. In the present work we describe the effect of additional MHD nonlinearity to this calculation. We studied how the zonal flow component and its nonlinear feedback to the fundamental frequency and found that the MHD nonlinearity doesn't significantly alter the frequency chirping response that is predicted by the calculation that neglects the MHD nonlinearity.

A contact layer element for large deformations

NASA Astrophysics Data System (ADS)

Weißenfels, C.; Wriggers, P.

2015-05-01

In many contact situations the material behavior of one contact member strongly influences the force acting between the two bodies. Unfortunately standard friction models cannot reproduce all of these material effects at the contact layer and often continuum interface elements are used instead. These elements are intrinsically tied to the fixed grid and hence cannot be used in large sliding simulations. Due to the shortcomings of the standard contact formulations and of the interface elements a new type of a contact layer element is developed in this work. The advantages of this element are the direct implementation of continuum models into the contact formulation and the application to arbitrary large deformations. Showing a relation between continuum and contact kinematics based on the solid-shell concept the new contact element is at the end a natural extension of the standard contact formulations into 3D. Two examples show that the continuum behavior can be exactly reproduced at the contact surface even in large sliding situations using this contact layer element. For the discretization of the new contact element the Mortar method is chosen exemplary, but it can be combined with all kinds of contact formulations.

Prospects for discovering pulsars in future continuum surveys using variance imaging

NASA Astrophysics Data System (ADS)

Dai, S.; Johnston, S.; Hobbs, G.

2017-12-01

In our previous paper, we developed a formalism for computing variance images from standard, interferometric radio images containing time and frequency information. Variance imaging with future radio continuum surveys allows us to identify radio pulsars and serves as a complement to conventional pulsar searches that are most sensitive to strictly periodic signals. Here, we carry out simulations to predict the number of pulsars that we can uncover with variance imaging in future continuum surveys. We show that the Australian SKA Pathfinder (ASKAP) Evolutionary Map of the Universe (EMU) survey can find ∼30 normal pulsars and ∼40 millisecond pulsars (MSPs) over and above the number known today, and similarly an all-sky continuum survey with SKA-MID can discover ∼140 normal pulsars and ∼110 MSPs with this technique. Variance imaging with EMU and SKA-MID will detect pulsars with large duty cycles and is therefore a potential tool for finding MSPs and pulsars in relativistic binary systems. Compared with current pulsar surveys at high Galactic latitudes in the Southern hemisphere, variance imaging with EMU and SKA-MID will be more sensitive, and will enable detection of pulsars with dispersion measures between ∼10 and 100 cm-3 pc.

Comparing a discrete and continuum model of the intestinal crypt

PubMed Central

Murray, Philip J.; Walter, Alex; Fletcher, Alex G.; Edwards, Carina M.; Tindall, Marcus J.; Maini, Philip K.

2011-01-01

The integration of processes at different scales is a key problem in the modelling of cell populations. Owing to increased computational resources and the accumulation of data at the cellular and subcellular scales, the use of discrete, cell-level models, which are typically solved using numerical simulations, has become prominent. One of the merits of this approach is that important biological factors, such as cell heterogeneity and noise, can be easily incorporated. However, it can be difficult to efficiently draw generalisations from the simulation results, as, often, many simulation runs are required to investigate model behaviour in typically large parameter spaces. In some cases, discrete cell-level models can be coarse-grained, yielding continuum models whose analysis can lead to the development of insight into the underlying simulations. In this paper we apply such an approach to the case of a discrete model of cell dynamics in the intestinal crypt. An analysis of the resulting continuum model demonstrates that there is a limited region of parameter space within which steady-state (and hence biologically realistic) solutions exist. Continuum model predictions show good agreement with corresponding results from the underlying simulations and experimental data taken from murine intestinal crypts. PMID:21411869

An Examination of Teacher Leaders' and Teachers' Perceptions of the Trainer of Trainer Model of Professional Development

ERIC Educational Resources Information Center

Hobbs, Shandar Nicole Armstrong

2017-01-01

The practice of using teacher leaders to support and develop teachers from within the educational organization is gaining support from research. The Trainer of Trainers (TOT) model of professional development is one practice used to develop educators. This study focused on the perceptions of teacher leaders within the TOT model. Teachers'…

Communication: Literacy and Development

ERIC Educational Resources Information Center

Literacy Work, 1971

1971-01-01

Author presents a preliminary discussion of the relationship of literacy and rural development. It presents the literacy continuum amongst the African population of Rhodesia, results of a small study of literacy retention, and a brief account of literacy effect on the development of subsistance agriculture. (Editor/LF)

Modeling Soft Tissue Damage and Failure Using a Combined Particle/Continuum Approach.

PubMed

Rausch, M K; Karniadakis, G E; Humphrey, J D

2017-02-01

Biological soft tissues experience damage and failure as a result of injury, disease, or simply age; examples include torn ligaments and arterial dissections. Given the complexity of tissue geometry and material behavior, computational models are often essential for studying both damage and failure. Yet, because of the need to account for discontinuous phenomena such as crazing, tearing, and rupturing, continuum methods are limited. Therefore, we model soft tissue damage and failure using a particle/continuum approach. Specifically, we combine continuum damage theory with Smoothed Particle Hydrodynamics (SPH). Because SPH is a meshless particle method, and particle connectivity is determined solely through a neighbor list, discontinuities can be readily modeled by modifying this list. We show, for the first time, that an anisotropic hyperelastic constitutive model commonly employed for modeling soft tissue can be conveniently implemented within a SPH framework and that SPH results show excellent agreement with analytical solutions for uniaxial and biaxial extension as well as finite element solutions for clamped uniaxial extension in 2D and 3D. We further develop a simple algorithm that automatically detects damaged particles and disconnects the spatial domain along rupture lines in 2D and rupture surfaces in 3D. We demonstrate the utility of this approach by simulating damage and failure under clamped uniaxial extension and in a peeling experiment of virtual soft tissue samples. In conclusion, SPH in combination with continuum damage theory may provide an accurate and efficient framework for modeling damage and failure in soft tissues.

The CO2 absorption spectrum in the 2.3 μm transparency window by high sensitivity CRDS: (II) Self-absorption continuum

NASA Astrophysics Data System (ADS)

Mondelain, D.; Vasilchenko, S.; Čermák, P.; Kassi, S.; Campargue, A.

2017-01-01

The CO2 absorption continuum near 2.3 μm is determined for a series of sub atmospheric pressures (250-750 Torr) by high sensitivity Cavity Ring Down Spectroscopy. An experimental procedure consisting in injecting successively a gas flow of CO2 and synthetic air, keeping constant the gas pressure in the CRDS cell, has been developed. This procedure insures a high stability of the spectra baseline by avoiding changes of the optical alignment due to pressure changes. The CO2 continuum was obtained as the difference between the CO2 absorption coefficient and a local lines simulation using a Voigt profile truncated at ±25 cm-1. Following the results of the preceding analysis of the CO2 rovibrational lines (Vasilchenko S et al. J Quant Spectrosc Radiat Transfer 10.1016/j.jqsrt.2016.07.002, a CO2 line list with intensities obtained by variational calculations and empirical line positions was preferred to the HITRAN line list. A quadratic pressure dependence of the absorption continuum is observed, with an average binary absorption coefficient increasing from 2 to 4×10-8 cm-1 amagat-2 between 4320 and 4380 cm-1. The obtained continuum is found in good agreement with a previous measurement using much higher densities (20 amagat) and a low resolution grating spectrograph and is consistent with values currently used in the analysis of Venus spectra.

A Role for Health Communication in the Continuum of HIV Care, Treatment, and Prevention

PubMed Central

Tomori, Cecilia; Risher, Kathryn; Limaye, Rupali J.; Lith, Lynn Van; Gibbs, Susannah; Smelyanskaya, Marina; Celentano, David D.

2015-01-01

Health communication has played a pivotal role in HIV prevention efforts since the beginning of the epidemic. The recent paradigm of combination prevention, which integrates behavioral, biomedical, and structural interventions, offers new opportunities for employing health communication approaches across the entire continuum of care. We describe key areas where health communication can significantly enhance HIV treatment, care, and prevention, presenting evidence from interventions that include health communication components. These interventions rely primarily on interpersonal communication, especially individual and group counseling, both within and beyond clinical settings to enhance the uptake of and continued engagement in care. Many successful interventions mobilize a network of trained community supporters or accompagnateurs, who provide education, counseling, psychosocial support, treatment supervision and other pragmatic assistance across the care continuum. Community treatment supporters reduce the burden on overworked medical providers, engage a wider segment of the community, and offer a more sustainable model for supporting people living with HIV. Additionally, mobile technologies are increasingly seen as promising avenues for ongoing cost-effective communication throughout the treatment cascade. A broader range of communication approaches, traditionally employed in HIV prevention efforts, that address community and sociopolitical levels through mass media, school- or workplace-based education, and entertainment modalities may be useful to interventions seeking to address the full care continuum. Future interventions would benefit from development of a framework that maps appropriate communication theories and approaches onto each step of the care continuum in order to evaluate the efficacy of communication components on treatment outcomes. PMID:25007201

Numerical Study of Rarefied Hypersonic Flow Interacting with a Continuum Jet. Degree awarded by Pennsylvania State Univ., Aug. 1999

NASA Technical Reports Server (NTRS)

Glass, Christopher E.

2000-01-01

An uncoupled Computational Fluid Dynamics-Direct Simulation Monte Carlo (CFD-DSMC) technique is developed and applied to provide solutions for continuum jets interacting with rarefied external flows. The technique is based on a correlation of the appropriate Bird breakdown parameter for a transitional-rarefied condition that defines a surface within which the continuum solution is unaffected by the external flow-jet interaction. The method is applied to two problems to assess and demonstrate its validity; one of a jet interaction in the transitional-rarefied flow regime and the other in the moderately rarefied regime. Results show that the appropriate Bird breakdown surface for uncoupling the continuum and non-continuum solutions is a function of a non-dimensional parameter relating the momentum flux and collisionality between the two interacting flows. The correlation is exploited for the simulation of a jet interaction modeled for an experimental condition in the transitional-rarefied flow regime and the validity of the correlation is demonstrated. The uncoupled technique is also applied to an aerobraking flight condition for the Mars Global Surveyor spacecraft with attitude control system jet interaction. Aerodynamic yawing moment coefficients for cases without and with jet interaction at various angles-of-attack were predicted, and results from the present method compare well with values published previously. The flow field and surface properties are analyzed in some detail to describe the mechanism by which the jet interaction affects the aerodynamics.

Modeling Soft Tissue Damage and Failure Using a Combined Particle/Continuum Approach

PubMed Central

Rausch, M. K.; Karniadakis, G. E.; Humphrey, J. D.

2016-01-01

Biological soft tissues experience damage and failure as a result of injury, disease, or simply age; examples include torn ligaments and arterial dissections. Given the complexity of tissue geometry and material behavior, computational models are often essential for studying both damage and failure. Yet, because of the need to account for discontinuous phenomena such as crazing, tearing, and rupturing, continuum methods are limited. Therefore, we model soft tissue damage and failure using a particle/continuum approach. Specifically, we combine continuum damage theory with Smoothed Particle Hydrodynamics (SPH). Because SPH is a meshless particle method, and particle connectivity is determined solely through a neighbor list, discontinuities can be readily modeled by modifying this list. We show, for the first time, that an anisotropic hyperelastic constitutive model commonly employed for modeling soft tissue can be conveniently implemented within a SPH framework and that SPH results show excellent agreement with analytical solutions for uniaxial and biaxial extension as well as finite element solutions for clamped uniaxial extension in 2D and 3D. We further develop a simple algorithm that automatically detects damaged particles and disconnects the spatial domain along rupture lines in 2D and rupture surfaces in 3D. We demonstrate the utility of this approach by simulating damage and failure under clamped uniaxial extension and in a peeling experiment of virtual soft tissue samples. In conclusion, SPH in combination with continuum damage theory may provide an accurate and efficient framework for modeling damage and failure in soft tissues. PMID:27538848

Transformation and Framework of Teacher Professional Development in Taiwan

ERIC Educational Resources Information Center

Huang, Bo-Ruey

2016-01-01

This article describes the situation of teacher professional development in Taiwan, including the history and the framework of teacher professional development. With diversification of teacher education systems and institutions, teacher professional development in Taiwan is undergoing a gradual governance shift from the model of centralised state…

For Teachers, by Teachers: An Exploration of Teacher-Generated Online Professional Development

ERIC Educational Resources Information Center

Rodesiler, Luke

2017-01-01

Participatory online professional development opportunities created for teachers by teachers have emerged with the proliferation of social media. This article presents an investigation of a voluntary, participant-driven, 5-week online professional development offering in which two high school English teachers invited colleagues at a distance to…

Preparation and Professional Development of Teacher Educators in Tanzania: Current Practices and Prospects

ERIC Educational Resources Information Center

Namamba, Adam; Rao, Congman

2017-01-01

Teacher educators play a key role in teacher education and education in general. Worldwide, little is known about preparation and professional development of teacher educators. This paper critically examined teacher educators' preparation and professional development in the context of educational reforms and mushrooming of teacher education…

The Development of Community Competence in the Teacher Education Curriculum

ERIC Educational Resources Information Center

Dobber, Marjolein; Vandyck, Inne; Akkerman, Sanne; Graaff, Rick de; Beishuizen, Jos; Pilot, Albert; Verloop, Nico; Vermunt, Jan

2013-01-01

Teachers are expected to frequently collaborate within teacher communities in schools. This requires teacher education to prepare student teachers by developing the necessary community competence. The present study empirically investigates the extent to which teacher education programmes pay attention to and aim to stimulate the development of…

Infusing Authentic Inquiry into Biotechnology

NASA Astrophysics Data System (ADS)

Hanegan, Nikki L.; Bigler, Amber

2009-10-01

Societal benefit depends on the general public's understandings of biotechnology (Betsch in World J Microbiol Biotechnol 12:439-443, 1996; Dawson and Cowan in Int J Sci Educ 25(1):57-69, 2003; Schiller in Business Review: Federal Reserve Bank of Philadelphia (Fourth Quarter), 2002; Smith and Emmeluth in Am Biol Teach 64(2):93-99, 2002). A National Science Foundation funded survey of high school biology teachers reported that hands-on biotechnology education exists in advanced high school biology in the United States, but is non-existent in mainstream biology coursework (Micklos et al. in Biotechnology labs in American high schools, 1998). The majority of pre-service teacher content preparation courses do not teach students appropriate content knowledge through the process of inquiry. A broad continuum exists when discussing inquiry-oriented student investigations (Hanegan et al. in School Sci Math J 109(2):110-134, 2009). Depending on the amount of structure in teacher lessons, inquiries can often be categorized as guided or open. The lesson can be further categorized as simple or authentic (Chinn and Malhotra in Sci Educ 86(2):175-218, 2002). Although authentic inquiries provide the best opportunities for cognitive development and scientific reasoning, guided and simple inquiries are more often employed in the classroom (Crawford in J Res Sci Teach 37(9):916-937, 2000; NRC in Inquiry and the national science education standards: a guide for teaching and learning, 2000). For the purposes of this study we defined inquiry as "authentic" if original research problems were resolved (Hanegan et al. in School Sci Math J 109(2):110-134, 2009; Chinn and Malhotra in Sci Educ 86(2):175-218, 2002; Roth in Authentic school science: knowing and learning in open-inquiry science laboratories, 1995). The research question to guide this study through naturalistic inquiry research methods was: How will participants express whether or not an authentic inquiry experience enhanced their understanding of biotechnology? As respondents explored numerous ideas in order to develop a workable research question, struggled to create a viable protocol, executed their experiment, and then evaluated their results, they commented on unexpected topics regarding the nature of science as well as specific content knowledge relating to their experiments. Four out of five participants reported they learned the most during authentic inquiry laboratory experience.

Who Are the Science Teachers That Seek Professional Development in Research Experience for Teachers (RET's)? Implications for Teacher Professional Development

ERIC Educational Resources Information Center

Saka, Yavuz

2013-01-01

To address the need to better prepare teachers to enact science education reforms, the National Science Foundation has supported a Research Experience for Teachers (RET's) format for teacher professional development. In these experiences, teachers work closely with practicing scientists to engage in authentic scientific inquiry. Although…

The Hurricane-flood-landslide continuum-forecasting Hurricane effects at landfall

USGS Publications Warehouse

Negri, A.J.; Golden, J.H.; Updike, R.G.

2004-01-01

The integration of remote-sensing and in-situ observations, and assimilation of these observations into high-resolution mesoscale models was described. It was observed that the greatest loss of life and property is the direct result of the storm because of the high winds and heavy rain. The research were conducted to develop a warning system that included satellite observations to track dangerous level of precipitation and hurricane. The focus of the continuum project was to improve the ability to predict the evolution of the Earth system.

Water vapor absorption in the atmospheric window at 239 GHz

NASA Technical Reports Server (NTRS)

Bauer, A.; Godon, M.; Carlier, J.; Ma, Q.

1995-01-01

Absolute absorption rates of pure water vapor and mixtures of water vapor and nitrogen have been measured in the atmospheric window at 239 GHz. The dependence on pressure as well as temperature has been obtained. The experimental data are compared with several theoretical or empirical models, and satisfactory agreement is obtained with the models involving a continuum; in the case of pure water vapor, the continuum contribution based upon recent theoretical developments gives good results. The temperature dependence is stronger than that proposed in a commonly used atmospheric transmission model.

Continuum model for hydrogen pickup in zirconium alloys of LWR fuel cladding

NASA Astrophysics Data System (ADS)

Wang, Xing; Zheng, Ming-Jie; Szlufarska, Izabela; Morgan, Dane

2017-04-01

A continuum model for calculating the time-dependent hydrogen pickup fractions in various Zirconium alloys under steam and pressured water oxidation has been developed in this study. Using only one fitting parameter, the effective hydrogen gas partial pressure at the oxide surface, a qualitative agreement is obtained between the predicted and previously measured hydrogen pickup fractions. The calculation results therefore demonstrate that H diffusion through the dense oxide layer plays an important role in the hydrogen pickup process. The limitations and possible improvement of the model are also discussed.

Ablation of silicate particles in high-speed continuum and transition flow with application to the collection of interplanetary dust particles

NASA Technical Reports Server (NTRS)

Rulison, Aaron J.; Flagan, Richard C.; Ahrens, Thomas J.; Miller, Wayne F.

1991-01-01

The ablative deceleration of spheres in the continuum and slip regimes is studied using spherical 7.1-micron-diam soda-lime glass particles launched from vacuum at about 4500 m/sec speed through a 13-micron-thick plastic film into a capture chamber containing Xe at 0.1 or 0.2 atm pressure and 295 K temperature. The results of SEM examinations of the collected ablated particles showed that the ratio of the ablated-particle radius (Rf) to the initial radius (R0) increased with gas pressure (from Rf/R0 about 0.67 at 0.1 atm, to about 0.88 at 0.2 atm). A model was developed to describe the ablation and deceleration of spheres in high-speed continuum and slip flow. The pressure dependence predicted by the model agreed with experimental results.

Hybrid discrete/continuum algorithms for stochastic reaction networks

DOE PAGES

Safta, Cosmin; Sargsyan, Khachik; Debusschere, Bert; ...

2014-10-22

Direct solutions of the Chemical Master Equation (CME) governing Stochastic Reaction Networks (SRNs) are generally prohibitively expensive due to excessive numbers of possible discrete states in such systems. To enhance computational efficiency we develop a hybrid approach where the evolution of states with low molecule counts is treated with the discrete CME model while that of states with large molecule counts is modeled by the continuum Fokker-Planck equation. The Fokker-Planck equation is discretized using a 2nd order finite volume approach with appropriate treatment of flux components to avoid negative probability values. The numerical construction at the interface between the discretemore » and continuum regions implements the transfer of probability reaction by reaction according to the stoichiometry of the system. As a result, the performance of this novel hybrid approach is explored for a two-species circadian model with computational efficiency gains of about one order of magnitude.« less

Assessment of current state of the art in modeling techniques and analysis methods for large space structures

NASA Technical Reports Server (NTRS)

Noor, A. K.

1983-01-01

Advances in continuum modeling, progress in reduction methods, and analysis and modeling needs for large space structures are covered with specific attention given to repetitive lattice trusses. As far as continuum modeling is concerned, an effective and verified analysis capability exists for linear thermoelastic stress, birfurcation buckling, and free vibration problems of repetitive lattices. However, application of continuum modeling to nonlinear analysis needs more development. Reduction methods are very effective for bifurcation buckling and static (steady-state) nonlinear analysis. However, more work is needed to realize their full potential for nonlinear dynamic and time-dependent problems. As far as analysis and modeling needs are concerned, three areas are identified: loads determination, modeling and nonclassical behavior characteristics, and computational algorithms. The impact of new advances in computer hardware, software, integrated analysis, CAD/CAM stems, and materials technology is also discussed.

Mid-IR super-continuum generation

NASA Astrophysics Data System (ADS)

Islam, Mohammed N.; Xia, Chenan; Freeman, Mike J.; Mauricio, Jeremiah; Zakel, Andy; Ke, Kevin; Xu, Zhao; Terry, Fred L., Jr.

2009-02-01

A Mid-InfraRed FIber Laser (MIRFIL) has been developed that generates super-continuum covering the spectral range from 0.8 to 4.5 microns with a time-averaged power as high as 10.5W. The MIRFIL is an all-fiber integrated laser with no moving parts and no mode-locked lasers that uses commercial off-the-shelf parts and leverages the mature telecom/fiber optics platform. The MIRFIL power can be easily scaled by changing the repetition rate and modifying the erbium-doped fiber amplifier. Some of the applications using the super-continuum laser will be described in defense, homeland security and healthcare. For example, the MIRFIL is being applied to a catheter-based medical diagnostic system to detect vulnerable plaque, which is responsible for most heart attacks resulting from hardening-of-the-arteries or atherosclerosis. More generally, the MIRFIL can be a platform for selective ablation of lipids without damaging normal protein or smooth muscle tissue.

Discrete shearlet transform: faithful digitization concept and its applications

NASA Astrophysics Data System (ADS)

Lim, Wang-Q.

2011-09-01

Over the past years, various representation systems which sparsely approximate functions governed by anisotropic features such as edges in images have been proposed. Alongside the theoretical development of these systems, algorithmic realizations of the associated transforms were provided. However, one of the most common short-comings of these frameworks is the lack of providing a unified treatment of the continuum and digital world, i.e., allowing a digital theory to be a natural digitization of the continuum theory. Shearlets were introduced as means to sparsely encode anisotropic singularities of multivariate data while providing a unified treatment of the continuous and digital realm. In this paper, we introduce a discrete framework which allows a faithful digitization of the continuum domain shearlet transform based on compactly supported shearlets. Finally, we show numerical experiments demonstrating the potential of the discrete shearlet transform in several image processing applications.

Constitutive Modeling of Nanotube/Polymer Composites with Various Nanotube Orientations

NASA Technical Reports Server (NTRS)

Odegard, Gregory M.; Gates, Thomas S.

2002-01-01

In this study, a technique has been proposed for developing constitutive models for polymer composite systems reinforced with single-walled carbon nanotubes (SWNT) with various orientations with respect to the bulk material coordinates. A nanotube, the local polymer adjacent to the nanotube, and the nanotube/polymer interface have been modeled as an equivalent-continuum fiber by using an equivalent-continuum modeling method. The equivalent-continuum fiber accounts for the local molecular structure and bonding information and serves as a means for incorporating micromechanical analyses for the prediction of bulk mechanical properties of SWNT/polymer composite. As an example, the proposed approach is used for the constitutive modeling of a SWNT/LaRC-SI (with a PmPV interface) composite system, with aligned nanotubes, three-dimensionally randomly oriented nanotubes, and nanotubes oriented with varying degrees of axisymmetry. It is shown that the Young s modulus is highly dependent on the SWNT orientation distribution.

Development and application of computational aerothermodynamics flowfield computer codes

NASA Technical Reports Server (NTRS)

Venkatapathy, Ethiraj

1993-01-01

Computations are presented for one-dimensional, strong shock waves that are typical of those that form in front of a reentering spacecraft. The fluid mechanics and thermochemistry are modeled using two different approaches. The first employs traditional continuum techniques in solving the Navier-Stokes equations. The second-approach employs a particle simulation technique (the direct simulation Monte Carlo method, DSMC). The thermochemical models employed in these two techniques are quite different. The present investigation presents an evaluation of thermochemical models for nitrogen under hypersonic flow conditions. Four separate cases are considered. The cases are governed, respectively, by the following: vibrational relaxation; weak dissociation; strong dissociation; and weak ionization. In near-continuum, hypersonic flow, the nonequilibrium thermochemical models employed in continuum and particle simulations produce nearly identical solutions. Further, the two approaches are evaluated successfully against available experimental data for weakly and strongly dissociating flows.

Tale taming radioactive fears: Linking nuclear waste disposal to the "continuum of the good".

PubMed

Yli-Kauhaluoma, Sari; Hänninen, Hannu

2014-04-01

We examine how the constructor of the world's first repository for the final disposal of spent nuclear fuel in Eurajoki, Finland, aims to shape lay understanding of the facility's risks and to tame the nuclear fears of the local community by producing positive associations, imagery and tales. Our empirical material consists of the constructor's newsletters targeted mainly at the local residents. In the narrative analysis, we identified a storyline where the construction of the repository is linked into the "continuum of the good" in the municipality of the construction site and the surrounding areas. The storyline consists of five different themes all emphasizing the "continuum of the good" in the area: cultural heritage, well-being, developing expertise, natural environment, and local families. Our study contributes to the literature on pro-nuclear storytelling by showing how the inclination is towards narratives that are constructed around local symbols, cultural landmarks, and institutions.

The effects of professional development related to classroom assessment on student achievement in science

NASA Astrophysics Data System (ADS)

Mazzie, Dawn Danielle

This study investigated the relationship between students' standardized test scores in science and (a) increases in teacher assessment literacy and (b) teacher participation in a Teacher Quality Research (TQR) project on classroom assessment. The samples for these studies were teachers from underperforming schools who volunteered to take part in a professional development program in classroom assessment. School groups were randomly assigned to the treatment group. For Study 1, teachers in the treatment received professional development in classroom assessment from a trained assessment coach. Teachers in the control received no professional development. For Study 2, teachers in Treatment 1 received professional development in classroom assessment from a trained assessment coach and teachers in Treatment 2 received professional development in classroom assessment from a facilitator with one day of training. Teachers in both groups completed a measure of assessment literacy, the Teacher Quality Research Test of Assessment Literacy Skills (TQR_TALS), prior to the beginning and then again at the conclusion of the four month professional development program. A hierarchical linear model (HLM) analysis was conducted to determine the relationship between students' standardized test scores in science and (a) increases in teacher assessment literacy and (b) teacher TQR status. Based upon these analyses, the professional development program increased teachers' assessment literacy skills; however, the professional development had no significant impact on students' achievement.

The education and employment status of patients with inflammatory bowel diseases.

PubMed

Marri, Sheetal R; Buchman, Alan L

2005-02-01

Inflammatory bowel disease (IBD) has the propensity to affect patients who are in their late teens and early 20s, an age when most people decide on their educational and career directions. This review describes the effects that IBD has on the continuum of education and employment. Patients with Crohn's disease and ulcerative colitis attain a similar level of education as that of the general population. The quality of life of such patients in school, as measured by both patients' and teachers' perceptions, indicates that, despite the difficulties that students face in terms of missed school time and physical inconveniences, teachers are generally perceived by students to have favorable attitudes toward helping them. Even though earlier work in the area of employment has suggested that the occurrence of IBD is clustered among people in white-collar positions, recent data have suggested that certain environmental risks for IBD (i.e., sedentary or indoor jobs) may be associated with jobs classified as being white-collar, and therefore having a white-collar job may in itself not be a risk factor for the development of IBD. Patients with IBD have a higher rate of nonparticipation in the labor force, and the participation rate seems to maintain steady levels over time. A majority of patients with IBD continue in the same employment positions over a period of years. Patients with IBD, especially those who have undergone surgery, took more sick leave than their counterparts without IBD. A majority of patients with IBD favored the disclosure of their diagnosis to their employers and perceived little discrimination in the workplace. Furthermore, most employers were perceived by their employees with IBD as having fair attitudes toward the compensation provided for their employees with IBD.

An analysis of zoo and aquarium provided teacher professional development

NASA Astrophysics Data System (ADS)

Kubarek-Sandor, Joy

Informal science institutions are a significant provider of science teacher professional development. As pressure continues to critically analyze the work of teachers and their effectiveness in the classroom, it is important to understand how informal science institutions contribute to effective change in teacher science content knowledge and pedagogy. This research study analyzed zoo and aquarium provided teacher professional development to respond to the research questions: How do zoos and aquaria determine and assess their goals for teacher professional development? How do these goals align with effective teacher change for science content knowledge and pedagogy? Theoretical frameworks for high quality teacher professional development, effective evaluation of teacher professional development, and learning in informal science settings guided the research. The sample for the study was AZA accredited zoos and aquariums providing teacher professional development (N=107). Data collection consisted of an online questionnaire, follow-up interviews, and content analysis of teacher professional development artifacts. Analysis revealed that by and large zoos and aquariums are lacking in their provision of science teacher professional development. Most professional development focuses on content or resources, neglecting pedagogy. Assessments mismatch the goals and rely heavily on self-report and satisfaction measures. The results demonstrate a marked difference between those zoos and aquariums that are larger in capacity versus those that are medium to small in size. This may be an area of research for the future, as well as analyzing the education resources produced by zoos and aquariums as these were emphasized heavily as a way they serve teachers.

Developing Inclusive Pre-Service and In-Service Teacher Education: Insights from Zanzibar Primary School Teachers

ERIC Educational Resources Information Center

Juma, Said; Lehtomäki, Elina; Naukkarinen, Aimo

2017-01-01

Developing inclusive teacher education to improve learning and schooling for all children is attracting increasing interest worldwide. This study examined teachers' insights into the development of inclusive teacher education by drawing on collaborative action research conducted by 20 primary school teachers in Zanzibar, Tanzania. The data were…

The Common Sociology between Teacher Evaluation and Teacher Development.

ERIC Educational Resources Information Center

Crow, Nedra; Peterson, Ken

The purpose of this study was to explore the sociological forces which have been identified in teacher development and to inquire into their role in teacher evaluation. To that end, a series of teacher development intervention programs and teacher interviews were conducted. This report describes the programs and interviews and highlights the most…

Pacific CRYSTAL Teacher Professional Development Models: Lessons Learned

NASA Astrophysics Data System (ADS)

van der Flier-Keller, E.; Yore, L.

2010-12-01

From 2005 to 2010 Pacific CRYSTAL (Centre for Research in Youth Science Teaching and Learning) has been engaged in community-based research fostering teacher leadership in innovative science education through a variety of approaches to teacher professional development. Pacific CRYSTAL is a University of Victoria based, NSERC funded project founded on a collaborative research model involving scentists, science educators and community members including schools, teachers, community groups and government. Pacific CRYSTAL professional development approaches embrace both in-service teachers and pre-service teachers, and include Lighthouse schools, workshops (ongoing as well as one-time), community-based partnerships in Pacific CRYSTAL research projects, teachers as researchers, and university science courses and workshops for pre-education and education students. A number of common themes, identified through these approaches, should be considered in the development and implementation of future science professional development initiatives. They include; teacher turnover, expanding and adding schools and participating teachers, teacher apprehension, building leadership capacity, further engagement of 'tourist' teachers, continuing professional support for teachers, as well as on-going mentoring.

Quasi-Continuum Reduction of Field Theories: A Route to Seamlessly Bridge Quantum and Atomistic Length-Scales with Continuum

DTIC Science & Technology

2016-04-01

AFRL-AFOSR-VA-TR-2016-0145 Quasi-continuum reduction of field theories: A route to seamlessly bridge quantum and atomistic length-scales with...field theories: A route to seamlessly bridge quantum and atomistic length-scales with continuum Principal Investigator: Vikram Gavini Department of...calculations on tens of thousands of atoms, and enable continuing efforts towards a seamless bridging of the quantum and continuum length-scales

DEVELOPMENT, DIFFUSION, AND EVALUATION.

ERIC Educational Resources Information Center

GUBA, EGON G.

THE KNOWLEDGE GAP BETWEEN INITIAL RESEARCH AND FINAL USE IS DISCUSSED IN TERMS OF THE FOUR STATES OF THE THEORY-PRACTICE CONTINUUM (RESEARCH, DEVELOPMENT, DIFFUSION, AND ADOPTION). THE TWO MIDDLE STAGES ARE EMPHASIZED. RESEARCH AND DEVELOPMENT CENTERS, REGIONAL EDUCATIONAL LABORATORIES, AND TITLE III PROJECTS ARE SUGGESTED AS AGENCIES RESPONSIBLE…

Making Their Own Path: Preservice Teachers' Development of Purpose in Social Studies Teacher Education

ERIC Educational Resources Information Center

Hawley, Todd S.; Crowe, Alicia R.

2016-01-01

Despite a solid body of research on rationale development in social studies teacher education, little research exists exploring how social studies preservice teachers' purposes develop over time. This article presents four examples of social studies preservice teachers as they grappled with developing a purpose for teaching social studies.…

Critical Friends Group for EFL Teacher Professional Development

ERIC Educational Resources Information Center

Vo, Long Thanh; Nguyen, Hoa Thi Mai

2010-01-01

For the best student outcomes, teachers need to engage in continuous professional development. As a result, models of teacher professional development have been developed, among which is the Critical Friends Group (CFG) technique. However, whether it works well with EFL teachers in an Asian context like Vietnam, where EFL teachers in particular do…

Accountability or Authenticity? The Alignment of Professional Development and Teacher Evaluation

ERIC Educational Resources Information Center

Su, Yahui; Feng, Liyia; Hsu, Chang-Hui

2017-01-01

The alignment of professional development and teacher evaluation has been a growing concern in teacher professional development practices. The issue of how teacher evaluation can help authentic professional development is important in that teachers only learn what is real, useful and valuable to them. Based on our reflections on current…

Developing a Scale on the Usage of Learner Control Strategy

ERIC Educational Resources Information Center

Kutlu, M. Oguz

2012-01-01

The aim of this study was to develop a Likert-like scale in order to measure teachers' usage level of learner control strategy. This study was carried out with 219 State primary school teachers who were class teachers, Turkish teachers, English teachers, Mathematics teachers, Science teachers, Social Sciences teachers, Religion and Moral teachers…

A Peer Coaching-Based Professional Development Approach to Improving the Learning Participation and Learning Design Skills of In-Service Teachers

ERIC Educational Resources Information Center

Ma, Ning; Xin, Shuang; Du, Jia-Yuan

2018-01-01

Personalized learning based on learning analytics has become increasingly important for teachers' development via providing adaptive contents and strategies for teachers by identifying their questions and needs. Currently, most studies on teachers' professional development focus on pre-service teachers, and studies on teachers' personalized…

Teacher Development.

ERIC Educational Resources Information Center

1997

Eight conference papers on language teacher development are presented, including: "Mosaics of Teacher Development and Socialization" (Andrew Barfield, Paul A. Beaufait, Sean Conley, Tim Murphey, Katsura Haruko), a panel presentation on aspects of and experiments in teacher development; "Questions About Teaching? Answers from…

Enhancing mathematics teachers' quality through Lesson Study.

PubMed

Lomibao, Laila S

2016-01-01

The efficiency and effectivity of the learning experience is dependent on the teacher quality, thus, enhancing teacher's quality is vital in improving the students learning outcome. Since, the usual top-down one-shot cascading model practice for teachers' professional development in Philippines has been observed to have much information dilution, and the Southeast Asian Ministers of Education Organization demanded the need to develop mathematics teachers' quality standards through the Southeast Asia Regional Standards for Mathematics Teachers (SEARS-MT), thus, an intensive, ongoing professional development model should be provided to teachers. This study was undertaken to determine the impact of Lesson Study on Bulua National High School mathematics teachers' quality level in terms of SEARS-MT dimensions. A mixed method of quantitative-qualitative research design was employed. Results of the analysis revealed that Lesson Study effectively enhanced mathematics teachers' quality and promoted teachers professional development. Teachers positively perceived Lesson Study to be beneficial for them to become a better mathematics teacher.

Comprehensive Teacher Induction: Linking Teacher Induction to Theory

ERIC Educational Resources Information Center

Keilwitz, Heather A.

2014-01-01

Teacher retention is a wide concern in education and in response school districts throughout the United States are developing more comprehensive teacher induction programs. Components of teacher induction programs that have assisted with successful teacher development include release time for teacher observation, assignment of a knowledgeable…

Validation of the Continuum of Care Conceptual Model for Athletic Therapy

PubMed Central

Lafave, Mark R.; Butterwick, Dale; Eubank, Breda

2015-01-01

Utilization of conceptual models in field-based emergency care currently borrows from existing standards of medical and paramedical professions. The purpose of this study was to develop and validate a comprehensive conceptual model that could account for injuries ranging from nonurgent to catastrophic events including events that do not follow traditional medical or prehospital care protocols. The conceptual model should represent the continuum of care from the time of initial injury spanning to an athlete's return to participation in their sport. Finally, the conceptual model should accommodate both novices and experts in the AT profession. This paper chronicles the content validation steps of the Continuum of Care Conceptual Model for Athletic Therapy (CCCM-AT). The stages of model development were domain and item generation, content expert validation using a three-stage modified Ebel procedure, and pilot testing. Only the final stage of the modified Ebel procedure reached a priori 80% consensus on three domains of interest: (1) heading descriptors; (2) the order of the model; (3) the conceptual model as a whole. Future research is required to test the use of the CCCM-AT in order to understand its efficacy in teaching and practice within the AT discipline. PMID:26464897

Using Multiscale Modeling to Study Coupled Flow, Transport, Reaction and Biofilm Growth Processes in Porous Media

NASA Astrophysics Data System (ADS)

Valocchi, A. J.; Laleian, A.; Werth, C. J.

2017-12-01

Perturbation of natural subsurface systems by fluid inputs may induce geochemical or microbiological reactions that change porosity and permeability, leading to complex coupled feedbacks between reaction and transport processes. Some examples are precipitation/dissolution processes associated with carbon capture and storage and biofilm growth associated with contaminant transport and remediation. We study biofilm growth due to mixing controlled reaction of multiple substrates. As biofilms grow, pore clogging occurs which alters pore-scale flow paths thus changing the mixing and reaction. These interactions are challenging to quantify using conventional continuum-scale porosity-permeability relations. Pore-scale models can accurately resolve coupled reaction, biofilm growth and transport processes, but modeling at this scale is not feasible for practical applications. There are two approaches to address this challenge. Results from pore-scale models in generic pore structures can be used to develop empirical relations between porosity and continuum-scale parameters, such as permeability and dispersion coefficients. The other approach is to develop a multiscale model of biofilm growth in which non-overlapping regions at pore and continuum spatial scales are coupled by a suitable method that ensures continuity of flux across the interface. Thus, regions of high reactivity where flow alteration occurs are resolved at the pore scale for accuracy while regions of low reactivity are resolved at the continuum scale for efficiency. This approach thus avoids the need for empirical upscaling relations in regions with strong feedbacks between reaction and porosity change. We explore and compare these approaches for several two-dimensional cases.

Medication-taking behaviours in chronic kidney disease with multiple chronic conditions: a meta-ethnographic synthesis of qualitative studies.

PubMed

Bartlett Ellis, Rebecca J; Welch, Janet L

2017-03-01

To identify behaviours associated with taking medications and medication adherence reported in qualitative studies of adults with chronic kidney disease and coexisting multiple chronic conditions. To inform medication adherence interventions, information is needed to clarify the nature of the relationships between behaviours that support medication-taking and medication adherence in multiple chronic conditions. Meta-ethnographic review and synthesis. CINAHL Complete, MEDLINE and PsycINFO databases were searched. Five qualitative studies met the inclusion criteria. A meta-ethnographic approach was used for synthesis. Medication-taking behaviours were abstracted from study findings and synthesised according to the contexts in which they occur and interpreted within a new developing framework named the Medication-taking Across the Care Continuum and Adherence-related Outcomes. Twenty categories of medication-taking behaviours occurred in three main contexts: (1) patient-provider clinical encounters, (2) pharmacy encounters and (3) day-to-day management. These behaviours are distinctly different, multilevel and interrelated. Together they represent a process occurring across a continuum. Future medication adherence research should consider using a multilevel ecological view of medication management. Clinical practice and policy development can benefit from further understanding socio-contextual behaviours that occur across the continuum. Nurses should have greater presence in chronic disease management and be positioned to support the day-to-day home management of patients' medications. Healthcare professionals can partner with patients to elucidate how these behaviours are enacted across the care continuum and in day-to-day management to identify opportunities to intervene on specific behaviours and promote medication adherence. © 2016 John Wiley & Sons Ltd.

Vocational Teacher Professional Development. Practice Application Brief No. 11.

ERIC Educational Resources Information Center

Brown, Bettina Lankard

Teacher shortages, new technologies, and vocational certification demands are directing attention to the need for professional development of vocational education (VE) teachers. VE teachers can use various strategies to enhance their performance and effectiveness through professional development. Worksite experiences give VE teachers opportunities…

Integrating Laptop Computers into Classroom: Attitudes, Needs, and Professional Development of Science Teachers--A Case Study

ERIC Educational Resources Information Center

Klieger, Aviva; Ben-Hur, Yehuda; Bar-Yossef, Nurit

2010-01-01

The study examines the professional development of junior-high-school teachers participating in the Israeli "Katom" (Computer for Every Class, Student and Teacher) Program, begun in 2004. A three-circle support and training model was developed for teachers' professional development. The first circle applies to all teachers in the…

Collaborative Professional Development for Statistics Teaching: A Case Study of Two Middle-School Mathematics Teachers

ERIC Educational Resources Information Center

de Oliveira Souza, Leandro; Lopes, Celi Espasandin; Pfannkuch, Maxine

2015-01-01

The recent introduction of statistics into the Brazilian curriculum has presented a multi-problematic situation for teacher professional development. Drawing on research in the areas of teacher development and statistical inquiry, we propose a Teacher Professional Development Cycle (TPDC) model. This paper focuses on two teachers who planned a…

HYDROGEN BALMER CONTINUUM IN SOLAR FLARES DETECTED BY THE INTERFACE REGION IMAGING SPECTROGRAPH (IRIS)

DOE Office of Scientific and Technical Information (OSTI.GOV)

Heinzel, P.; Kleint, L., E-mail: pheinzel@asu.cas.cz

We present a novel observation of the white light flare (WLF) continuum, which was significantly enhanced during the X1 flare on 2014 March 29 (SOL2014-03-29T17:48). Data from the Interface Region Imaging Spectrograph (IRIS) in its near-UV channel show that at the peak of the continuum enhancement, the contrast at the quasi-continuum window above 2813 Å reached 100%-200% and can be even larger closer to Mg II lines. This is fully consistent with the hydrogen recombination Balmer-continuum emission, which follows an impulsive thermal and non-thermal ionization caused by the precipitation of electron beams through the chromosphere. However, a less probable photosphericmore » continuum enhancement cannot be excluded. The light curves of the Balmer continuum have an impulsive character with a gradual fading, similar to those detected recently in the optical region on the Solar Optical Telescope on board Hinode. This observation represents a first Balmer-continuum detection from space far beyond the Balmer limit (3646 Å), eliminating seeing effects known to complicate the WLF detection. Moreover, we use a spectral window so far unexplored for flare studies, which provides the potential to study the Balmer continuum, as well as many metallic lines appearing in emission during flares. Combined with future ground-based observations of the continuum near the Balmer limit, we will be able to disentangle various scenarios of the WLF origin. IRIS observations also provide a critical quantitative measure of the energy radiated in the Balmer continuum, which constrains various models of the energy transport and deposit during flares.« less

Improving Teachers' Assessment Literacy through Professional Development

ERIC Educational Resources Information Center

Koh, Kim H.

2011-01-01

This study examined the effects of professional development on teachers' assessment literacy between two groups of teachers: (1) teachers who were involved in ongoing and sustained professional development in designing authentic classroom assessment and rubrics; and (2) teachers who were given only short-term, one-shot professional development…

Organizing physics teacher professional education around productive habit development: A way to meet reform challenges

NASA Astrophysics Data System (ADS)

Etkina, Eugenia; Gregorcic, Bor; Vokos, Stamatis

2017-06-01

Extant literature on teacher preparation suggests that preservice teachers learn best when they are immersed in a community that allows them to develop dispositions, knowledge, and practical skills and share with the community a strong vision of what good teaching entails. However, even if the requisite dispositions, knowledge, and skills in pursuing the shared vision of good teaching are developed, the professional demands on a teacher's time are so great out of, and so complex during class time that if every decision requires multiple considerations and deliberations with oneself, the productive decisions might not materialize. We argue that the link between intentional decision making and actual teaching practice are teacher's habits (spontaneous responses to situational cues). Teachers unavoidably develop habits with practical experience and under the influence of knowledge and belief structures that in many ways condition the responses of teachers in their practical work. To steer new teachers away from developing unproductive habits directed towards "survival" instead of student learning, we propose that teacher preparation programs (e.g., in physics) strive to develop in preservice teachers strong habits of mind and practice that will serve as an underlying support structure for beginning teachers. We provide examples of physics teacher habits that are to be developed during the program, propose mechanisms for the development of such habits, and outline possible future research agendas around habits.

Secondary science teachers' view toward and classroom translation of sustained professional development

NASA Astrophysics Data System (ADS)

Lewis, Elizabeth Blake

This study concerns the phenomenon of secondary science teacher learning and enacting instructional strategies learned at the Communication in Science Inquiry Project (CISIP) teacher professional development events, as well as teacher perception of, and relationship to, this year-long professional development program. The CISIP program teaches science teachers how to build scientific classroom discourse communities with their students. Some of the science teachers were previous participants in the professional development, and acted as mentor teachers. The research design employed an integrated conceptual framework of situated learning theory with an analytical lens of teachers' professional, institutional and affinity, identities. A multi-method approach was used to generate data. Throughout the 2007-2008 academic year, the teachers' fidelity to the professional development model was measured using a classroom observation instrument aligned with the professional development model. From these observation data a longitudinal model, using hierarchical linear modeling, was constructed. In addition, surveys and interview data were used to construct both whole group and case studies of two high school science teachers who taught biology at the same school. The results indicated that there was a significant difference between previous and new participants; specifically, the longer teachers had participated in the professional development, and adopted a mentorship role, the greater their fidelity of classroom instruction to the CISIP model. Additionally, the case study teacher who developed a CISIP model-aligned affinity identity implemented more of the instructional strategies than the teacher who maintained his school-based institutional identity.

Integrating Laptop Computers into Classroom: Attitudes, Needs, and Professional Development of Science Teachers—A Case Study

NASA Astrophysics Data System (ADS)

Klieger, Aviva; Ben-Hur, Yehuda; Bar-Yossef, Nurit

2010-04-01

The study examines the professional development of junior-high-school teachers participating in the Israeli "Katom" (Computer for Every Class, Student and Teacher) Program, begun in 2004. A three-circle support and training model was developed for teachers' professional development. The first circle applies to all teachers in the program; the second, to all teachers at individual schools; the third to teachers of specific disciplines. The study reveals and describes the attitudes of science teachers to the integration of laptop computers and to the accompanying professional development model. Semi-structured interviews were conducted with eight science teachers from the four schools participating in the program. The interviews were analyzed according to the internal relational framework taken from the information that arose from the interviews. Two factors influenced science teachers' professional development: (1) Introduction of laptops to the teachers and students. (2) The support and training system. Interview analysis shows that the disciplinary training is most relevant to teachers and they are very interested in belonging to the professional science teachers' community. They also prefer face-to-face meetings in their school. Among the difficulties they noted were the new learning environment, including control of student computers, computer integration in laboratory work and technical problems. Laptop computers contributed significantly to teachers' professional and personal development and to a shift from teacher-centered to student-centered teaching. One-to-One laptops also changed the schools' digital culture. The findings are important for designing concepts and models for professional development when introducing technological innovation into the educational system.

Teacher Design in Teams as a Professional Development Arrangement for Developing Technology Integration Knowledge and Skills of Science Teachers in Tanzania

ERIC Educational Resources Information Center

Kafyulilo, Ayoub; Fisser, Petra; Voogt, Joke

2016-01-01

This study investigated the impact of teacher design teams as a professional development arrangement for developing technology integration knowledge and skills among in-service science teachers. The study was conducted at a secondary school in Tanzania, where 12 in-service science teachers participated in a workshop about technology integration in…

From Teacher Professional Development to the Classroom: How NLP Technology Can Enhance Teachers' Linguistic Awareness to Support Curriculum Development for English Language Learners

ERIC Educational Resources Information Center

Burstein, Jill; Shore, Jane; Sabatini, John; Moulder, Brad; Lentini, Jennifer; Biggers, Kietha; Holtzman, Steven

2014-01-01

This article reports on two studies using "Language Muse[superscript SM]" (LM), a web-based, teacher professional development (TPD) application designed to enhance teachers' linguistic awareness and to support teachers in the development of language-based instructional scaffolding for English language learners (ELL). In Study 1,…

Teachers' Professional Development: A Theoretical Review

ERIC Educational Resources Information Center

Postholm, May Britt

2012-01-01

Background and purpose: The article reviews studies that focus on the professional development of teachers after they have completed their basic teacher training. Teacher professional development is defined as teachers' learning: how they learn to learn and how they apply their knowledge in practice to support pupils' learning. The research…

RE Student Teachers' Professional Development: Results, Reflections and Implications

ERIC Educational Resources Information Center

Ubani, Martin

2016-01-01

This article discusses some issues related to the professional development of Religious Education (RE) student teachers in initial teacher education based on empirical results on the development of the pedagogical thinking of Finnish RE student teachers during their teacher education. The article begins by describing the concept of professionalism…

Developing Self-Efficacy: Exploring Preservice Coursework, Student Teaching, and Professional Development Experiences

ERIC Educational Resources Information Center

McKim, Aaron J.; Velez, Jonathan J.

2017-01-01

To extend current understanding of school-based agriculture teacher development, this study explored the relationship between teacher development experiences and the self-efficacy of early career agriculture teachers. Three teacher development experiences were of interest: (a) preservice coursework, (b) student teaching, and (c) professional…

Program Development for Primary School Teachers' Critical Thinking

ERIC Educational Resources Information Center

Boonjeam, Waraporn; Tesaputa, Kowat; Sri-ampai, Anan

2017-01-01

The objectives of this research were: 1) to study the elements and indicators of primary school teachers' critical thinking, 2) to study current situation, desirable situation, development technique, and need for developing the primary school teachers' critical thinking, 3) to develop the program for developing the primary school teachers'…

Readiness Continuum.

ERIC Educational Resources Information Center

Kelly, Joseph J.; And Others

Presented is a curriculum guide to the readiness level of the child who is hyperactive, a behavior problem, or unable to sustain attention. The following areas are included: language development (including perceptual-motor skills), physical development (following the Frostig Perceptual Program), alphabet and sounds, creative exercises, language…

Continuum of Collaboration: Little Steps for Little Feet

ERIC Educational Resources Information Center

Powell, Gwynn M.

2013-01-01

This mini-article outlines a continuum of collaboration for faculty within a department of the same discipline. The goal of illustrating this continuum is showcase different stages of collaboration so that faculty members can assess where they are as a collective and consider steps to collaborate more. The separate points along a continuum of…

Novice-Service Language Teacher Development: Bridging the Gap between Preservice and In-Service Education and Development

ERIC Educational Resources Information Center

Farrell, Thomas S. C.

2012-01-01

One reason for teacher attrition is that a gap exists between pre-service teacher preparation and in-service teacher development, in that most novice teachers suddenly have no further contact with their teacher educators, and from the very first day on the job, must face the same challenges as their more experienced colleagues, often without much…

The self- and foreign-absorption continua of water vapor by cavity ring-down spectroscopy near 2.35 μm.

PubMed

Mondelain, D; Vasilchenko, S; Čermák, P; Kassi, S; Campargue, A

2015-07-21

The room temperature self- and foreign-continua of water vapor have been measured near 4250 cm(-1) with a newly developed high sensitivity cavity ring down spectrometer (CRDS). The typical sensitivity of the recordings is αmin≈ 6 × 10(-10) cm(-1) which is two orders of magnitude better than previous Fourier transform spectroscopy (FTS) measurements in the spectral region. The investigated spectral interval is located in the low energy range of the important 2.1 μm atmospheric transparency window. Self-continuum cross-sections, CS, were retrieved from the quadratic dependence of the spectrum base line level measured for different water vapor pressures between 0 and 15 Torr, after subtraction of the local water monomer lines contribution calculated using HITRAN2012 line parameters. The CS values were determined with 5% accuracy for four spectral points between 4249.2 and 4257.3 cm(-1). Their values of about 3.2 × 10(-23) cm(2) molecule(-1) atm(-1) are found 20% higher than predicted by the MT_CKD V2.5 model but two times weaker than reported in the literature using FTS. The foreign-continuum was evaluated by injecting various amounts of synthetic air in the CRDS cell while keeping the initial water vapor partial pressure constant. The foreign-continuum cross-section, CF, was retrieved from a linear fit of the spectrum base line level versus the air pressure. The obtained CF values are larger by a factor of 4.5 compared to the MT_CKD values and smaller by a factor of 1.7 compared to previous FTS values. As a result, for an atmosphere at room temperature with 60% relative humidity, the foreign-continuum contribution to the water continuum near 4250 cm(-1) is found to be on the same order as the self-continuum contribution.

Why and How Teachers Transform Their Instruction

NASA Astrophysics Data System (ADS)

Light, Barbara J.

In his 2011 book The highly qualified teacher: What is teacher quality and how do we measure it? Strong argues that as a profession, education has struggled to measure teacher quality and therefore cannot provide a proven system to consistently develop high-quality teachers. In order to move toward an operational definition of teacher quality, Kennedy, in her 2008 journal article entitled "Contributions of qualitative research to research on teacher qualifications" suggests that the causal mechanisms of the development of teachers who are identified as high-quality teachers must be researched, documented, and then used in teacher preparation and development. Instructional ability is a key component of teacher effectiveness. This case study examines instructional transformations made by four teachers to explore why and how teachers make transformations in their teaching. The overarching conclusion of the study is the importance of student-centeredness as a component of teacher effectiveness.

Dan Says - Continuum Magazine | NREL

Science.gov Websites

transportation system-from developing more efficient electric and hydrogen fuel-cell vehicles to inventing infrastructure are more daunting than those we are overcoming in developing and integrating renewable electricity more efficient, and developing the technology needed to put more electric and biofuel vehicles on the

Dynamic Changes of Pectin Epitopes in Cell Walls during the Development of the Procambium–Cambium Continuum in Poplar

PubMed Central

Liu, Jundi; Hou, Jie; Chen, Huimin; Pei, Keliang; Li, Yi; He, Xin-Qiang

2017-01-01

The change of pectin epitopes during procambium–cambium continuum development was investigated by immunolocalization in poplar. The monoclonal antibody JIM5 labels homogalacturonan (HGA) with a low degree of esterification, and the monoclonal antibody JIM7 labels HGA with a high degree of methyl-esterification. Arabinan, rather than galactan, and HGA with low degree of esterification were located in the cell walls of procambial, while HGA with a low degree of esterification was located in the tangential walls, and galactan was located in both the tangential and radial walls of procambial, yet nearly no arabinan was located in the tangential walls of the cambial cells. The changes in pectin distribution took place when periclinal divisions appeared within a procambial trace. The distribution difference of pectin epitopes was also present in procambium–cambium derivatives. The arabinan existed in all cell walls of primary xylem, but was absent from the tangential walls of secondary xylem cells. The galactan existed only in mature primary phloem. Furthermore, 19 pectin methylesterases (PMEs) genes were identified by RNA sequencing, six genes presented highly differentially and were supposed to be involved in the cell wall esterification process. The results provide direct evidence of the dynamic changes of pectin epitopes during the development of the procambium–cambium continuum in poplar. PMID:28783076

Modeling CO2 Storage in Fractured Reservoirs: Fracture-Matrix Interactions of Free-Phase and Dissolved CO2

NASA Astrophysics Data System (ADS)

Oldenburg, C. M.; Zhou, Q.; Birkholzer, J. T.

2017-12-01

The injection of supercritical CO2 (scCO2) in fractured reservoirs has been conducted at several storage sites. However, no site-specific dual-continuum modeling for fractured reservoirs has been reported and modeling studies have generally underestimated the fracture-matrix interactions. We developed a conceptual model for enhanced CO2 storage to take into account global scCO2 migration in the fracture continuum, local storage of scCO2 and dissolved CO2 (dsCO2) in the matrix continuum, and driving forces for scCO2 invasion and dsCO2 diffusion from fractures. High-resolution discrete fracture-matrix models were developed for a column of idealized matrix blocks bounded by vertical and horizontal fractures and for a km-scale fractured reservoir. The column-scale simulation results show that equilibrium storage efficiency strongly depends on matrix entry capillary pressure and matrix-matrix connectivity while the time scale to reach equilibrium is sensitive to fracture spacing and matrix flow properties. The reservoir-scale modeling results shows that the preferential migration of scCO2 through fractures is coupled with bulk storage in the rock matrix that in turn retards the fracture scCO2 plume. We also developed unified-form diffusive flux equations to account for dsCO2 storage in brine-filled matrix blocks and found solubility trapping is significant in fractured reservoirs with low-permeability matrix.

Continuum modelling of pedestrian flows - Part 2: Sensitivity analysis featuring crowd movement phenomena

NASA Astrophysics Data System (ADS)

Duives, Dorine C.; Daamen, Winnie; Hoogendoorn, Serge P.

2016-04-01

In recent years numerous pedestrian simulation tools have been developed that can support crowd managers and government officials in their tasks. New technologies to monitor pedestrian flows are in dire need of models that allow for rapid state-estimation. Many contemporary pedestrian simulation tools model the movements of pedestrians at a microscopic level, which does not provide an exact solution. Macroscopic models capture the fundamental characteristics of the traffic state at a more aggregate level, and generally have a closed form solution which is necessary for rapid state estimation for traffic management purposes. This contribution presents a next step in the calibration and validation of the macroscopic continuum model detailed in Hoogendoorn et al. (2014). The influence of global and local route choice on the development of crowd movement phenomena, such as dissipation, lane-formation and stripe-formation, is studied. This study shows that most self-organization phenomena and behavioural trends only develop under very specific conditions, and as such can only be simulated using specific parameter sets. Moreover, all crowd movement phenomena can be reproduced by means of the continuum model using one parameter set. This study concludes that the incorporation of local route choice behaviour and the balancing of the aptitude of pedestrians with respect to their own class and other classes are both essential in the correct prediction of crowd movement dynamics.

Continuum-Kinetic Models and Numerical Methods for Multiphase Applications

NASA Astrophysics Data System (ADS)

Nault, Isaac Michael

This thesis presents a continuum-kinetic approach for modeling general problems in multiphase solid mechanics. In this context, a continuum model refers to any model, typically on the macro-scale, in which continuous state variables are used to capture the most important physics: conservation of mass, momentum, and energy. A kinetic model refers to any model, typically on the meso-scale, which captures the statistical motion and evolution of microscopic entitites. Multiphase phenomena usually involve non-negligible micro or meso-scopic effects at the interfaces between phases. The approach developed in the thesis attempts to combine the computational performance benefits of a continuum model with the physical accuracy of a kinetic model when applied to a multiphase problem. The approach is applied to modeling a single particle impact in Cold Spray, an engineering process that intimately involves the interaction of crystal grains with high-magnitude elastic waves. Such a situation could be classified a multiphase application due to the discrete nature of grains on the spatial scale of the problem. For this application, a hyper elasto-plastic model is solved by a finite volume method with approximate Riemann solver. The results of this model are compared for two types of plastic closure: a phenomenological macro-scale constitutive law, and a physics-based meso-scale Crystal Plasticity model.

Mind the Gap: A Semicontinuum Model for Discrete Electrical Propagation in Cardiac Tissue.

PubMed

Costa, Caroline Mendonca; Silva, Pedro Andre Arroyo; dos Santos, Rodrigo Weber

2016-04-01

Electrical propagation in cardiac tissue is a discrete or discontinuous phenomenon that reflects the complexity of the anatomical structures and their organization in the heart, such as myocytes, gap junctions, microvessels, and extracellular matrix, just to name a few. Discrete models or microscopic and discontinuous models are, so far, the best options to accurately study how structural properties of cardiac tissue influence electrical propagation. These models are, however, inappropriate in the context of large scale simulations, which have been traditionally performed by the use of continuum and macroscopic models, such as the monodomain and the bidomain models. However, continuum models may fail to reproduce many important physiological and physiopathological aspects of cardiac electrophysiology, for instance, those related to slow conduction. In this study, we develop a new mathematical model that combines characteristics of both continuum and discrete models. The new model was evaluated in scenarios of low gap-junctional coupling, where slow conduction is observed, and was able to reproduce conduction block, increase of the maximum upstroke velocity and of the repolarization dispersion. None of these features can be captured by continuum models. In addition, the model overcomes a great disadvantage of discrete models, as it allows variation of the spatial resolution within a certain range.

Filters for Improvement of Multiscale Data from Atomistic Simulations

DOE Office of Scientific and Technical Information (OSTI.GOV)

Gardner, David J.; Reynolds, Daniel R.

Multiscale computational models strive to produce accurate and efficient numerical simulations of systems involving interactions across multiple spatial and temporal scales that typically differ by several orders of magnitude. Some such models utilize a hybrid continuum-atomistic approach combining continuum approximations with first-principles-based atomistic models to capture multiscale behavior. By following the heterogeneous multiscale method framework for developing multiscale computational models, unknown continuum scale data can be computed from an atomistic model. Concurrently coupling the two models requires performing numerous atomistic simulations which can dominate the computational cost of the method. Furthermore, when the resulting continuum data is noisy due tomore » sampling error, stochasticity in the model, or randomness in the initial conditions, filtering can result in significant accuracy gains in the computed multiscale data without increasing the size or duration of the atomistic simulations. In this work, we demonstrate the effectiveness of spectral filtering for increasing the accuracy of noisy multiscale data obtained from atomistic simulations. Moreover, we present a robust and automatic method for closely approximating the optimum level of filtering in the case of additive white noise. By improving the accuracy of this filtered simulation data, it leads to a dramatic computational savings by allowing for shorter and smaller atomistic simulations to achieve the same desired multiscale simulation precision.« less

Filters for Improvement of Multiscale Data from Atomistic Simulations

DOE PAGES

Gardner, David J.; Reynolds, Daniel R.

2017-01-05

Multiscale computational models strive to produce accurate and efficient numerical simulations of systems involving interactions across multiple spatial and temporal scales that typically differ by several orders of magnitude. Some such models utilize a hybrid continuum-atomistic approach combining continuum approximations with first-principles-based atomistic models to capture multiscale behavior. By following the heterogeneous multiscale method framework for developing multiscale computational models, unknown continuum scale data can be computed from an atomistic model. Concurrently coupling the two models requires performing numerous atomistic simulations which can dominate the computational cost of the method. Furthermore, when the resulting continuum data is noisy due tomore » sampling error, stochasticity in the model, or randomness in the initial conditions, filtering can result in significant accuracy gains in the computed multiscale data without increasing the size or duration of the atomistic simulations. In this work, we demonstrate the effectiveness of spectral filtering for increasing the accuracy of noisy multiscale data obtained from atomistic simulations. Moreover, we present a robust and automatic method for closely approximating the optimum level of filtering in the case of additive white noise. By improving the accuracy of this filtered simulation data, it leads to a dramatic computational savings by allowing for shorter and smaller atomistic simulations to achieve the same desired multiscale simulation precision.« less

Identification of a transcriptional signature for the wound healing continuum

PubMed Central

Peake, Matthew A; Caley, Mathew; Giles, Peter J; Wall, Ivan; Enoch, Stuart; Davies, Lindsay C; Kipling, David; Thomas, David W; Stephens, Phil

2014-01-01

There is a spectrum/continuum of adult human wound healing outcomes ranging from the enhanced (nearly scarless) healing observed in oral mucosa to scarring within skin and the nonhealing of chronic skin wounds. Central to these outcomes is the role of the fibroblast. Global gene expression profiling utilizing microarrays is starting to give insight into the role of such cells during the healing process, but no studies to date have produced a gene signature for this wound healing continuum. Microarray analysis of adult oral mucosal fibroblast (OMF), normal skin fibroblast (NF), and chronic wound fibroblast (CWF) at 0 and 6 hours post-serum stimulation was performed. Genes whose expression increases following serum exposure in the order OMF < NF < CWF are candidates for a negative/impaired healing phenotype (the dysfunctional healing group), whereas genes with the converse pattern are potentially associated with a positive/preferential healing phenotype (the enhanced healing group). Sixty-six genes in the enhanced healing group and 38 genes in the dysfunctional healing group were identified. Overrepresentation analysis revealed pathways directly and indirectly associated with wound healing and aging and additional categories associated with differentiation, development, and morphogenesis. Knowledge of this wound healing continuum gene signature may in turn assist in the therapeutic assessment/treatment of a patient's wounds. PMID:24844339

Developing Teachers: Improving Professional Development for Teachers

ERIC Educational Resources Information Center

Coe, Robert; Aloisi, Cesare; Higgins, Steve; Major, Lee Elliot

2015-01-01

This document is a summary of the report "What Makes Great Teaching". It argues that improved teacher ­development will positively impact on pupil attainment, particular those from disadvantaged backgrounds. "Developing Teachers" presents five policy recommendations which have been signed by 17 of Britain's leading headteachers…

A Multi-Scale Method for Dynamics Simulation in Continuum Solvent Models I: Finite-Difference Algorithm for Navier-Stokes Equation.

PubMed

Xiao, Li; Cai, Qin; Li, Zhilin; Zhao, Hongkai; Luo, Ray

2014-11-25

A multi-scale framework is proposed for more realistic molecular dynamics simulations in continuum solvent models by coupling a molecular mechanics treatment of solute with a fluid mechanics treatment of solvent. This article reports our initial efforts to formulate the physical concepts necessary for coupling the two mechanics and develop a 3D numerical algorithm to simulate the solvent fluid via the Navier-Stokes equation. The numerical algorithm was validated with multiple test cases. The validation shows that the algorithm is effective and stable, with observed accuracy consistent with our design.

Career Development and Professional Attrition of Novice ESL Teachers of Adults

ERIC Educational Resources Information Center

Valeo, Antonella; Faez. Farahnaz

2013-01-01

Research and development in language teacher education and, more recently, teacher accreditation has had enormous impact on the professional lives of ESL teachers in Canada. There has been less interest, however, in examining the career development and employment experiences of accredited ESL teachers as they transition from TESL programs to ESL…

Professional Development and Job-Embedded Collaboration: How Teachers Learn to Exercise Leadership

ERIC Educational Resources Information Center

Hunzicker, Jana

2012-01-01

Research shows that professional development alone does not provide adequate leadership preparation for teachers, yet many develop into established teacher leaders. The purpose of this study was to explore how teachers learn to exercise informal leadership in the schools and districts where they work. Eight elementary teachers who lived and worked…

Professional "Development" and Professional "Learning": Bridging the Gap for Experienced Physical Education Teachers

ERIC Educational Resources Information Center

Armour, Kathleen M.; Yelling, Martin

2004-01-01

This article analyses the career-long continuing professional development (CPD) of 85 experienced physical education (PE) teachers in England. Data were collected using semi-structured interviews (20 teachers) and open-ended profile questionnaires (a further 65 teachers) to find out what forms of professional development these teachers had…

Development and Validation of Information Technology Mentor Teacher Attitude Scale: A Pilot Study

ERIC Educational Resources Information Center

Saltan, Fatih

2015-01-01

The aim of this study development and validation of a teacher attitude scale toward Information Technology Mentor Teachers (ITMT). ITMTs give technological support to other teachers for integration of technology in their lessons. In the literature, many instruments have been developed to measure teachers' attitudes towards the technological tools…

Professional Development through Teacher Collaboration: An Approach to Enhance Teaching and Learning in Science and Mathematics in Tanzania

ERIC Educational Resources Information Center

Kafyulilo, Ayoub Cherd

2013-01-01

This study introduces "teachers' collaboration" as an approach to teachers' professional development geared at enhancing science and mathematics teaching in Tanzania secondary schools. Teachers' professional development through teachers' collaboration has been reported to be effective for the improvement of schools' performance and…

Alignment of Teacher-Developed Curricula and National Standards in Qatar's National Education Reform

ERIC Educational Resources Information Center

Nasser, Ramzi; Zaki, Eman; Allen, Nancy; Al Mula, Badria; Al Mutawaha, Fatma; Al Bin Ali, Hessa; Kerr, Tricia

2014-01-01

This study investigated the degree to which teacher developed curriculum was aligned with the national standards in Qatar. Three sources of data included teacher response to a questionnaire, teacher interviews and expert rating of the alignment of teacher-developed materials with curriculum standards. A survey and interview questions measured…

A Narrative Inquiry into Chinese Teacher Induction in West China through Cross-Cultural Teacher Development

ERIC Educational Resources Information Center

Huang, Ju; Xu, Shijing

2015-01-01

This article is part of a narrative study of Chinese beginning teacher induction through cross-cultural teacher development, which has been developed and contextualized in the "Teacher Education Reciprocal Learning Program" between the University of Windsor (UW), Canada and Southwest University (SWU), China. This program is part of…

Comparative Analysis of Participation of Teachers of STEM and Non-STEM Subjects in Professional Development

ERIC Educational Resources Information Center

Chiyaka, Edward T.; Kibirige, Joachim; Sithole, Alec; McCarthy, Peter; Mupinga, Davison M.

2017-01-01

School administrators continuously consider teacher professional development (PD) as one of the key strategies to improving teachers' pedagogical skills. Modern proposals for advancing education by improving student learning outcomes are centered on high quality professional development for teachers. However, teachers face a number of barriers…

Collaboration between Teacher Educators and Schools to Enhance Development

ERIC Educational Resources Information Center

Postholm, May Britt

2016-01-01

The article focuses on school-based development and how collaboration between teacher educators and leaders and teachers can promote development in teacher education, in school and in the collaboration site in school where both parties meet. The data were collected in Norway through qualitative interviews with groups of teachers and leaders at…

Parent-Teacher Partnership and High School Students' Development in Mainland China: The Mediating Role of Teacher-Student Relationship

ERIC Educational Resources Information Center

Deng, Linyuan; Zhou, Nan; Nie, Ruihong; Jin, Peipei; Yang, Mengxi; Fang, Xiaoyi

2018-01-01

Parent-teacher partnership is associated closely with adolescents' development. However, little is known about the association between parent-teacher partnership and Chinese high school students' development. Therefore, this study examines whether and how parent-teacher partnership (objective contacts and subjective relationship quality) relates…

Saudi Arabian Science Teachers and Supervisors' Views of Professional Development Needs

ERIC Educational Resources Information Center

Mansour, Nasser; Alshamrani, Saeed M.; Aldahmash, Abdulwali H.; Alqudah, Basil M.

2013-01-01

Problem Statement: Teacher professional development is a prominent feature in the educational landscapes of both developed and developing countries. Teacher development can be conceptualised as a mechanism for driving change in educational systems and/or as a strategy for empowering teachers to improve their professional knowledge and pedagogy. To…

Professional Development Sites: Revitalizing Preservice Education in Middle Schools.

ERIC Educational Resources Information Center

Bell, Nancy M.

This case study reports on the experiences of teachers and student teachers during the process of developing and implementing professional development sites (PDSs) at one urban and two rural middle schools. The study examines the phases of development that teachers go through in the process of developing PDSs and how teachers' level of development…

A Talent Development Approach to Assessing Pre-Service Performance in Early Childhood Teacher Education

ERIC Educational Resources Information Center

Benner, Susan M.; Hatch, J. Amos

2004-01-01

A team of early childhood teacher education faculty developed the 3-D talent development model of teacher education, blending theory and research from many sources. These sources include research on talent development, nonuniversal development, and roles of teachers and their professional growth. The faculty integrated constructs from these…

A Situative Perspective on Developing Writing Pedagogy in a Teacher Professional Learning Community

ERIC Educational Resources Information Center

Pella, Shannon

2011-01-01

The bulk of current research on teacher professional development is focused on teacher learning in the context of teacher professional learning communities (PLCs). In teacher PLCs, groups of teachers meet regularly to increase their own learning and the learning of their students. Teacher PLCs offer a learning model in which, "new ideas and…

Teacher Educator Identity Development of the Nontraditional Teacher Educator

ERIC Educational Resources Information Center

Newberry, Melissa

2014-01-01

The development of a professional teacher educator identity has implications for how one negotiates the duties of a teacher, scholar, and learner. The research on teacher educator identity in the USA has been largely conducted on traditional teacher educators, or those who have started their careers as public school teachers and then went on to…

Relational Agency and Teacher Development: A CHAT Analysis of a Collaborative Professional Inquiry Project with Biology Teachers

ERIC Educational Resources Information Center

McNicholl, Jane

2013-01-01

Teacher quality largely determines student outcomes and many argue for high quality teacher training and professional development (PD). Much PD has been heavily critiqued and what constitutes effective provision for teachers remains contested. Disenfranchisement of teachers, through neglect of prior expertise and failure to acknowledge teachers'…

Teacher-to-Teacher Mentoring. For Tech Teachers

ERIC Educational Resources Information Center

Gora, Kathleen; Hinson, Janice

2004-01-01

Many principals want to provide effective professional development to assist teachers with technology integration, but they don't know where to begin. Sometimes teachers participate in professional development opportunities offered by local school districts, but these one-size-fits-all experiences seldom address teachers' specific needs or skill…

Developing a Cadre of Cooperating Teachers.

ERIC Educational Resources Information Center

Romano, Anthony W.; And Others

A University of Oklahoma program for the development of cooperating teachers is designed to screen, prepare, and select classroom teachers, who receive a university adjunct instructor appointment as cooperating teachers, to serve student teachers in the elementary school program. The initial screening to identify classroom teachers who are…

Dilemmas of reform: An exploration of science teachers' collective sensemaking of formative assessment practices

NASA Astrophysics Data System (ADS)

Heredia, Sara Catherine

Current reform efforts in science education call for significant shifts in how science is taught and learned. Teachers are important gatekeepers for reform, as they must enact these changes with students in their own classrooms. As such, professional development approaches need to be developed and studied to understand how teachers interpret and make instructional plans to implement these reforms. However, traditional approaches to studying implementation of reforms often draw on metrics such as time allotted to new activities, rather than exploring the ways in which teachers make sense of these reforms. In this dissertation I draw upon a body of work called sensemaking that has focused on locating learning in teachers' conversations in departmental work groups. I developed a conceptual and analytic framework to analyze how teachers make sense of reform given their local contexts and then used this framework to perform a case study of one group of teachers that participated in larger professional development project that examined the impact of a learning progression on science teachers' formative assessment practices. I draw upon videotapes of three years of monthly professional development meetings as my primary source of data, and used an ethnographic approach to identify dilemmas surfaced by teachers, sources of ambiguity and uncertainty, and patterns of and resources for teacher sensemaking. The case study reveals relationships between the type of dilemma surfaced by the teachers and different patterns of sensemaking for modification of teaching practices. When teachers expressed concerns about district or administrative requirements, they aligned their work in the professional development to those external forces. In contrast, teachers were able to develop and try out new practices when they perceived coherence between the professional development and school or district initiatives. These results underscore the importance of coherence between various components of teachers' work environments.

Supporting Teachers' Understandings of Function through Online Professional Development

ERIC Educational Resources Information Center

Silverman, Jason

2017-01-01

This article explores one segment of an extended research and development project that was conducted to better understand the ways online teacher professional development can support teachers' development of deep and connected mathematical understandings. In particular, this article discusses teachers' understandings of the concept of…

Investigating Rural Teachers' Professional Development, Instructional Knowledge, and Classroom Practice

ERIC Educational Resources Information Center

Glover, Todd A.; Nugent, Gwen C.; Chumney, Frances L.; Ihlo, Tanya; Shapiro, Edward S.; Guard, Kirra; Koziol, Natalie; Bovaird, Jim

2016-01-01

Teachers Speak was a national survey study designed to investigate the characteristics of rural elementary school teachers' existing professional development; differences in professional development practices between rural and non-rural settings; and the potential influence of professional development characteristics on rural teachers' knowledge,…

Edge-relevant plasma simulations with the continuum code COGENT

NASA Astrophysics Data System (ADS)

Dorf, M.; Dorr, M.; Ghosh, D.; Hittinger, J.; Rognlien, T.; Cohen, R.; Lee, W.; Schwartz, P.

2016-10-01

We describe recent advances in cross-separatrix and other edge-relevant plasma simulations with COGENT, a continuum gyro-kinetic code being developed by the Edge Simulation Laboratory (ESL) collaboration. The distinguishing feature of the COGENT code is its high-order finite-volume discretization methods, which employ arbitrary mapped multiblock grid technology (nearly field-aligned on blocks) to handle the complexity of tokamak divertor geometry with high accuracy. This paper discusses the 4D (axisymmetric) electrostatic version of the code, and the presented topics include: (a) initial simulations with kinetic electrons and development of reduced fluid models; (b) development and application of implicit-explicit (IMEX) time integration schemes; and (c) conservative modeling of drift-waves and the universal instability. Work performed for USDOE, at LLNL under contract DE-AC52-07NA27344 and at LBNL under contract DE-AC02-05CH11231.

PuMA: the Porous Microstructure Analysis software

NASA Astrophysics Data System (ADS)

Ferguson, Joseph C.; Panerai, Francesco; Borner, Arnaud; Mansour, Nagi N.

2018-01-01

The Porous Microstructure Analysis (PuMA) software has been developed in order to compute effective material properties and perform material response simulations on digitized microstructures of porous media. PuMA is able to import digital three-dimensional images obtained from X-ray microtomography or to generate artificial microstructures. PuMA also provides a module for interactive 3D visualizations. Version 2.1 includes modules to compute porosity, volume fractions, and surface area. Two finite difference Laplace solvers have been implemented to compute the continuum tortuosity factor, effective thermal conductivity, and effective electrical conductivity. A random method has been developed to compute tortuosity factors from the continuum to rarefied regimes. Representative elementary volume analysis can be performed on each property. The software also includes a time-dependent, particle-based model for the oxidation of fibrous materials. PuMA was developed for Linux operating systems and is available as a NASA software under a US & Foreign release.

Developments and Control of Biocompatible Conducting Polymer for Intracorporeal Continuum Robots.

PubMed

Chikhaoui, Mohamed Taha; Benouhiba, Amine; Rougeot, Patrick; Rabenorosoa, Kanty; Ouisse, Morvan; Andreff, Nicolas

2018-04-30

Dexterity of robots is highly required when it comes to integration for medical applications. Major efforts have been conducted to increase the dexterity at the distal parts of medical robots. This paper reports on developments toward integrating biocompatible conducting polymers (CP) into inherently dexterous concentric tube robot paradigm. In the form of tri-layer thin structures, CP micro-actuators produce high strains while requiring less than 1 V for actuation. Fabrication, characterization, and first integrations of such micro-actuators are presented. The integration is validated in a preliminary telescopic soft robot prototype with qualitative and quantitative performance assessment of accurate position control for trajectory tracking scenarios. Further, CP micro-actuators are integrated to a laser steering system in a closed-loop control scheme with displacements up to 5 mm. Our first developments aim toward intracorporeal medical robotics, with miniaturized actuators to be embedded into continuum robots.

Foreign Language Teachers' Professional Development in Information Age

NASA Astrophysics Data System (ADS)

Fan, Xiying; Wu, Gang

Cultivation of students' learning autonomy has raised new challenges to teachers' professional development, dynamic, continuous, lifelong full-scale development, with emphasis on the creativity and constancy of the teachers' quality development. The teachers' professional development can take the following approaches: studying theories about foreign language teaching with the aid of modern information technology; organizing online teaching research activities supported by information technology and carrying peer observation and dialogue -teaching reflection in internet environment and fostering scholarly teachers.

Science and Mathematics Teachers Working Toward Equity Through Teacher Research: Tracing Changes Across Their Research Process and Equity Views

NASA Astrophysics Data System (ADS)

Brenner, Mary E.; Bianchini, Julie A.; Dwyer, Hilary A.

2016-12-01

We investigated secondary science and mathematics teachers engaged in a two-and-a-half-year professional development effort focused on equity. We examined how teachers conducting research on their own instructional practices—a central learning strategy of the professional development project—informed and/or constrained their views related to three strands of equity: teachers and teaching, students and learning, and students' families and communities. Data collected included recordings of professional development seminars and school-site meetings, three sets of individual interviews with teacher researchers, and drafts and final products of the classroom research teachers conducted. From our qualitative analyses of data, we found that most teachers addressed at least two of the three equity strands in researching their own practice. We also found that most transformed their understandings of teachers and students as a result of their teacher research process. However, teachers' views of families and communities changed in less substantive ways. We close with recommendations for other researchers and professional developers intent on supporting science and mathematics teachers in using teacher research to work toward equity.

Doing Research on Education for Sustainable Development

ERIC Educational Resources Information Center

Reunamo, Jyrki; Pipere, Anita

2011-01-01

Purpose: The purpose of this paper is to describe the research preferences and differences of education for sustainable development (ESD) researchers. A model with the continuums assimilation-accommodation and adaptation-agency was applied resulting in quantitative, qualitative, theoretic and participative research orientations.…

Scientist-Teacher Partnerships as Professional Development: An Action Research Study

DOE Office of Scientific and Technical Information (OSTI.GOV)

Willcuts, Meredith H.

The overall purpose of this action research study was to explore the experiences of ten middle school science teachers involved in a three-year partnership program between scientists and teachers at a Department of Energy national laboratory, including the impact of the program on their professional development, and to improve the partnership program by developing a set of recommendations based on the study’s findings. This action research study relied on qualitative data including field notes recorded at the summer academies and data from two focus groups with teachers and scientists. Additionally, the participating teachers submitted written reflections in science notebooks, participatedmore » in open-ended telephone interviews that were transcribed verbatim, and wrote journal summaries to the Department of Energy at the end of the summer academy. The analysis of the data, collaboratively examined by the teachers, the scientists, and the science education specialist acting as co-researchers on the project, revealed five elements critical to the success of the professional development of science teachers. First, scientist-teacher partnerships are a unique contribution to the professional development of teachers of science that is not replicated in other forms of teacher training. Second, the role of the science education specialist as a bridge between the scientists and teachers is a unique and vital one, impacting all aspects of the professional development. Third, there is a paradox for classroom teachers as they view the professional development experience from two different lenses – that of learner and that of teacher. Fourth, learning for science teachers must be designed to be constructivist in nature. Fifth, the principles of the nature of science must be explicitly showcased to be seen and understood by the classroom teacher.« less

How we developed a role-based portfolio for teachers' professional development.

PubMed

Pyörälä, Eeva

2014-09-01

Faculty development requires practical tools for supporting teachers' professional development. In a modern medical education context, teachers need to adapt to various educational roles. This article describes how a role-based portfolio with a qualitative self-assessment scale was developed. It strives to encourage and support teachers' growth in different educational roles. The portfolio was developed between 2009 and 2012 at the University of Helsinki in dialogue with teachers involved in faculty development. It is based on the role framework presented by Harden and Crosby. Today, it also involves the educational premises of constructive alignment, reflection and a scholarly approach to teaching. The role-based portfolio has led the teachers to discover new educational roles and set goals in their professional development.

Reverberation Mapping of the Continuum Source in Active Galactic Nuclei

NASA Astrophysics Data System (ADS)

Fausnaugh, Michael Martin

I present results from a monitoring campaign of 11 active galactic nuclei (AGN) conducted in Spring of 2014. I use the reverberation mapping method to probe the interior structures of the AGN, specifically the broad line regions (BLRs) and accretion disks. One of these AGN, NGC 5548, was also subject to multi-wavelength (X-ray, UV, optical, and near-IR) monitoring using 25 ground-based telescopes and four space-based facilities. For NGC 5548, I detect lags between the continuum emission at different wavelengths that follow a trend consistent with the prediction for continuum reprocessing by an accretion disk with temperature profile T ∝ R -3/4. However, the lags imply a disk radius that is 3 times larger than the prediction from standard thin-disk models. The lags at wavelengths longer than the Vband are also equal to or greater than the lags of high-ionization-state emission lines (such as HeII lambda1640 and lambda4686), suggesting that the continuum-emitting source is of a physical size comparable to the inner broad-line region. Using optical spectra from the Large Binocular Telescope, I estimate the bias of the interband continuum lags due to BLR emission observed in the filters, and I find that the bias for filters with high levels of BLR contamination (˜20%) can be important for the shortest continuum lags. This likely has a significant impact on the u and U bands owing to Balmer continuum emission. I then develop a new procedure for the internal (night-to-night) calibration of time series spectra that can reach precisions of ˜1 millimagnitude and improves traditional techniques by up to a factor of 5. At this level, other systematic issues (e.g., the nightly sensitivity functions and Fe II contamination) limit the final precision of the observed light curves. Using the new calibration method, I next present the data and first results from the optical spectroscopic monitoring component of the reverberation mapping campaign. Five AGN were sufficiently variable to measure continuum-Hbeta lags and super-massive black hole masses: MCG+08-11-011, NGC 2617, NGC 4051, 3C 382, and Mrk 374. I also obtain Hgamma and HeII lags for all objects except 3C 382. The HeII lags indicate radial stratification of the BLR, and the masses derived from different emission lines are in general agreement. The relative responsivities of these lines to continuum variations are also in qualitative agreement with photoionization models. Finally, I measure optical continuum lags for the two most variable targets, MCG+08-11-011 and NGC 2617. I again find lags consistent with geometrically thin accretion-disk models that have temperature profiles T ∝ R-3/4. The observed lags are larger than predictions based on standard thin-disk theory by factors of 3.3 for MCG+08-11-011 and 2.3 for NGC 2617. Using a physical model, these differences can be explained if the mass accretion rates are larger than inferred from the optical continuum luminosity by a factor of 4.3 in MCG+08-11-011 and a factor of 1.3 in NGC 2617. While the X-ray variability in NGC 2617 precedes the UV/optical variability, the long 2.6 day lag is problematic for coronal reprocessing models.

A Descriptive Correlational Study of Teacher Participation in Professional Development and Teacher Efficacy

ERIC Educational Resources Information Center

Tupou, Samuel F.

2013-01-01

This study examines teacher efficacy within the context of professional development to understand the relationship between teacher efficacy and teacher collaboration. Two theoretical frameworks framed this teacher efficacy study based on "locus of control" and "social cognitive theory." A 29-item questionnaire was e-mailed to…

How Do We Keep Teachers in Our Classrooms? The TNT Response.

ERIC Educational Resources Information Center

Gonzales, Frank; Sosa, Alicia Salinas

1993-01-01

This report outlines and evaluates a project, Teachers Need Teachers (TNT), developed by the Intercultural Development Research Association (IDRA). TNT is a teacher induction program for first-year teachers who are certified in bilingual education and teach limited-English-proficient students. Beginning teachers are assigned to experienced…

Teacher Leadership: District and School Leader Readiness Tool

ERIC Educational Resources Information Center

American Institutes for Research, 2017

2017-01-01

As interest in teacher leadership has grown, many leading organizations have developed tools and guidance to support schools, districts, and teacher leaders themselves. For instance, the National Network of State Teachers of the Year developed resources on teacher leader career pathways and advocacy approaches, as well as teacher leader standards.…

Community-Based Teacher Professional Development in Remote Areas in Indonesia

ERIC Educational Resources Information Center

Harjanto, Ignatius; Lie, Anita; Wihardini, Diah; Pryor, Laura; Wilson, Mark

2018-01-01

The Indonesian government has been struggling to improve the quality of teachers in its public and private schools. Several programmes of teacher education and teacher certification have been designed to enhance teacher quality. However, the programmes do not yet develop effective teachers. Supporting the government programmes, the Tanoto…

Differences across Academic Subjects in Teachers' Attitudes about Professional Development

ERIC Educational Resources Information Center

Torff, Bruce; Byrnes, Katherine

2011-01-01

A survey study examined how attitudes about professional development (PD) vary among teachers of different subjects. Elementary teachers were more supportive of PD than health and physical education, social studies, and science teachers; special education teachers were more supportive of PD than social studies and science teachers; and five…

Development of multicomponent hybrid density functional theory with polarizable continuum model for the analysis of nuclear quantum effect and solvent effect on NMR chemical shift.

PubMed

Kanematsu, Yusuke; Tachikawa, Masanori

2014-04-28

We have developed the multicomponent hybrid density functional theory [MC_(HF+DFT)] method with polarizable continuum model (PCM) for the analysis of molecular properties including both nuclear quantum effect and solvent effect. The chemical shifts and H/D isotope shifts of the picolinic acid N-oxide (PANO) molecule in chloroform and acetonitrile solvents are applied by B3LYP electron exchange-correlation functional for our MC_(HF+DFT) method with PCM (MC_B3LYP/PCM). Our MC_B3LYP/PCM results for PANO are in reasonable agreement with the corresponding experimental chemical shifts and isotope shifts. We further investigated the applicability of our method for acetylacetone in several solvents.

The hurricane-flood-landslide continuum

USGS Publications Warehouse

Negri, A.J.; Burkardt, N.; Golden, J.H.; Halverson, J.B.; Huffman, G.J.; Larsen, M.C.; McGinley, J.A.; Updike, R.G.; Verdin, J.P.; Wieczorek, G.F.

2005-01-01

In August 2004, representatives from NOAA, NASA, the US Geological Survey (USGS), as well as other government agencies and academic institutions convened in San Juan, Puerto Rico, at a workshop to discuss a proposed research project called the Hurricane-Flood-Landslide Continuum (HFLC). The purpose of the HFLC is to develop and integrate the multidisciplinary tools needed to issue regional guidance products for floods and landslide associated with major tropical rain systems with sufficient lead time that local emergency managers can notify vulnerable populations and protect infrastructure. The workshop sought to initiate discussion among these agencies about their highly complementary capabilities, and to establish a framework to leverage the strengths of each agency. Once a prototype system is developed, it could be adapted for use in regions that have a high frequency of tropical disturbances.

Comparisons of anomalous and collisional radial transport with a continuum kinetic edge code

NASA Astrophysics Data System (ADS)

Bodi, K.; Krasheninnikov, S.; Cohen, R.; Rognlien, T.

2009-05-01

Modeling of anomalous (turbulence-driven) radial transport in controlled-fusion plasmas is necessary for long-time transport simulations. Here the focus is continuum kinetic edge codes such as the (2-D, 2-V) transport version of TEMPEST, NEO, and the code being developed by the Edge Simulation Laboratory, but the model also has wider application. Our previously developed anomalous diagonal transport matrix model with velocity-dependent convection and diffusion coefficients allows contact with typical fluid transport models (e.g., UEDGE). Results are presented that combine the anomalous transport model and collisional transport owing to ion drift orbits utilizing a Krook collision operator that conserves density and energy. Comparison is made of the relative magnitudes and possible synergistic effects of the two processes for typical tokamak device parameters.

[Self-Determination in Medical Rehabilitation - Development of a Conceptual Model for Further Theoretical Discussion].

PubMed

Senin, Tatjana; Meyer, Thorsten

2018-01-22

Aim was to gather theoretical knowledge about self-determination and to develop a conceptual model for medical rehabilitation- which serves as a basis for discussion. We performed a literature research in electronic databases. Various theories and research results were adopted and transferred to the context of medical rehabilitation and into a conceptual model. The conceptual model of self-determination reflects on a continuum which forms of self-determination may be present in situations of medical rehabilitation treatments. The location on the continuum depends theoretically on the manifestation of certain internal and external factors that may influence each other. The model provides a first conceptualization of self-determination focusing on medical rehabilitation which should be further refined and tested empirically. © Georg Thieme Verlag KG Stuttgart · New York.

Cognitive impairment and cardiovascular diseases in the elderly. A heart-brain continuum hypothesis.

PubMed

Abete, Pasquale; Della-Morte, David; Gargiulo, Gaetano; Basile, Claudia; Langellotto, Assunta; Galizia, Gianluigi; Testa, Gianluca; Canonico, Vincenzo; Bonaduce, Domenico; Cacciatore, Francesco

2014-11-01

The aging population is increasing and, therefore, a higher prevalence of cardiac disease is emerging; including hypertension, coronary artery disease, atrial fibrillation and chronic heart failure. Large cohort studies have revealed a relationship among increased risk for cognitive impairment and dementia in cardiovascular diseases probably due to embolic stroke or chronic cerebral hypoperfusion. Thus, the aim of the present review is to overview the studies that investigate the presence and/or the development of cognitive impairments and dementia in patients with varied types of cardiovascular disease. Finally, a continuum among hypertension, coronary artery disease, atrial fibrillation and chronic heart failure with to the development of cognitive impairment and progression to dementia has been hypothesized. Copyright © 2014 Elsevier B.V. All rights reserved.

Teacher Development: A Real Need for English Departments in Vietnam.

ERIC Educational Resources Information Center

Hiep, Pham Hoa

2001-01-01

Examines English-as-a-Foreign-Language (EFL) teacher training and teacher development in Vietnam. Suggests ways to promote professional development among EFL teachers in Vietnam, which may be applicable to similar situations in other countries. (Author/VWL)

Beyond Superheroes and Advocacy: The Pathway of Teacher Leadership Development

ERIC Educational Resources Information Center

Smylie, Mark A.; Eckert, Jonathan

2018-01-01

This article introduces new perspectives, principles and recommendations for the successful development of teacher leadership. It draws from literature on teacher leadership, work redesign, and on-the-job leadership development to explore key insights and questions for teacher leadership development, and it presents a conceptual-theoretical model…

Learning, Motivation, and Transfer: Successful Teacher Professional Development

ERIC Educational Resources Information Center

McDonald, Lex

2012-01-01

In this article, I am concerned with three key issues of teacher professional development--teacher learning, motivation, and transfer of learning. Each issue has received minimal attention in teacher professional development literature. The three issues are discussed, and a model of an integrative professional development approach is outlined,…

Teachers as Course Developers.

ERIC Educational Resources Information Center

Graves, Kathleen, Ed.

The collection of essays on teachers as course developers is designed to help teachers understand how to develop courses or modify existing ones using their own experience and the experiences and theories of others. It attempts to capture this process through the stories of six teachers who have developed courses. Each narrative focuses on a…

A Model of Professional Development: Teachers' Perceptions of Their Professional Development

ERIC Educational Resources Information Center

Avidov-Ungar, Orit

2016-01-01

This research aims to evaluate the manner in which teachers perceive their professional development process. Forty-three teachers from Israeli schools participated in the study. I used a semi-structured interview to understand the teachers' perceptions about their professional development. The qualitative analysis identified two dimensions that…

Barely There Tales: A Phenomenological Study of Stories Told by Pre-Service Teachers

ERIC Educational Resources Information Center

Ybos, Cynthia Shank

2010-01-01

Teacher stories were once relegated to informal gatherings but more recently this aspect of teacher development is being carefully studied in more formalized settings because it is believed to be an important part of teacher development. New ways are being sought to use various aspects of storytelling to help pre-service teachers develop important…

The Relationship between Teachers' Perceptions about Job-Embedded Professional Development and Teacher Efficacy in Implementing Technology

ERIC Educational Resources Information Center

Cooper, Calvin H., Jr.

2014-01-01

Consistent with a recognized challenge across the United States, the local problem addressed in this study was teachers' inability to implement new technologies in the classroom. Professional development is the channel through which teachers improve, and high-quality professional development has been shown to enhance teacher efficacy. Professional…

Predictors of Teacher Intervention in Indirect Bullying at School and Outcome of a Professional Development Presentation for Teachers

ERIC Educational Resources Information Center

Dedousis-Wallace, Anna; Shute, Rosalyn; Varlow, Megan; Murrihy, Rachael; Kidman, Tony

2014-01-01

This study with 326 girls-school teachers developed and tested a model of predictors of the likelihood that teachers will intervene in indirect bullying, and evaluated a professional development presentation. Teachers responded to bullying vignettes before and after a presentation on indirect bullying (Experimentals) or adolescent mental health…

Teacher Learning in a Mathematics and Science Inquiry Professional Development Program: First Steps in Emergent Teacher Leadership

ERIC Educational Resources Information Center

Yow, Jan A.; Lotter, Christine

2016-01-01

This study investigates the role of an inquiry professional development institute in empowering middle school mathematics and science teachers to develop as teacher leaders. Teachers and coaches jointly attended content sessions and participated in practice teaching sessions with students. The coaches led reflection sessions following the practice…

Head Start Classroom Teachers' and Assistant Teachers' Perceptions of Professional Development Using a Learn Framework

ERIC Educational Resources Information Center

Nasser, Ilham; Kidd, Julie K.; Burns, M. Susan; Campbell, Trina

2015-01-01

This study investigates early childhood education teachers' and assistant teachers' views about a year-long professional development model that focuses on developing intentional teaching. The study shares the results of interviews conducted with the teachers at the end of the implementation of a one-year experimental professional model in Head…

Developing New Teacher Inquiry and Criticality: The Role of Online Discussions

ERIC Educational Resources Information Center

Unwin, Adam

2015-01-01

This work concerns the professional development of UK teachers in their first year of teaching. It is interested in how the online discussions (ODs) these teachers undertook as part of the Master of Teaching contributed to this development process. The teachers worked in online tutor groups made up of teachers from different schools, phases…

Teacher Experience, Learning, and Change: An Investigation of the Effects of Long-Term Professional Development

ERIC Educational Resources Information Center

Coffino, Kara Lee

2012-01-01

As US public schools become increasingly diverse and teachers are expected to teach across cultural differences, teacher educators must consider how different professional development models shape teacher learning and practice. This study explores how a cohort of 55 P-12 teachers experienced and perceived long-term professional development focused…

Comparing Teachers', Administrators', and Instructional Coaches' Perceptions of Personalized Professional Development

ERIC Educational Resources Information Center

Hanson, Timothy E.

2017-01-01

The purpose of teacher professional development is to enhance teacher quality so that students may achieve at high levels. Many times, professional development is too general or not connected to teachers' needs or learning preferences. The purpose of this study was to investigate and compare the perceptions of teachers, administrators, and…

A Multi-Year Study of the Impact of the Rice Model Teacher Professional Development on Elementary Science Teachers

ERIC Educational Resources Information Center

Diaconu, Dana Viorica; Radigan, Judy; Suskavcevic, Milijana; Nichol, Carolyn

2012-01-01

A teacher professional development program for in-service elementary school science teachers, the Rice Elementary Model Science Lab (REMSL), was developed for urban school districts serving predominately high-poverty, high-minority students. Teachers with diverse skills and science capacities came together in Professional Learning Communities, one…

An Approach to Develop Physics Student Teachers' Skills of Using Instructional Technology

ERIC Educational Resources Information Center

Devecioglu, Yasemin; Akdeniz, Ali Riza

2008-01-01

It is very important to develop student teachers' skills and knowledge during the pre-service teacher education process. In this study, the effectiveness of the approach in which student teachers' gained the skills of developing and using Teacher Guided Materials (TGMs) based on integration of technology on physics education in Special Teaching…

Professional development that works: Impacting elementary science teachers' learning and practice during the implementation of an inquiry-oriented science curriculum

NASA Astrophysics Data System (ADS)

Schlang, Jodi A.

One of the most important factors for developing science literacy for all students is teacher knowledge of science content and pedagogy. This study was designed to evaluate the impact of professional development on teacher learning, changes in teacher behavior, and student learning. The goal was to develop a deeper understanding of how the Elementary Science Teaching and Learning (ESTL) program affected teacher learning and changed teacher behavior in the classroom. This study also provided insight into the effect of the ESTL program on student learning during the first year of the professional development. This mixed method case study was used to examine the link between participation in the ESTL program, teacher learning, changes in teacher classroom behavior, and student learning. Qualitative observations and videotaped sessions provided rich description of the professional development and implementation of inquiry-oriented strategies in participant's classrooms. Artifacts and interviews provided evidence of teacher learning and changes in teacher behaviors. Quantitative data included self-report survey data examining changes in teacher behavior and the measurement of student learning used both science district assessment scores and CSAP writing scores. Key findings include: (1) teacher learning was reported in the areas of questioning and scope and sequence of the curriculum occurred; (2) statistically significant changes teacher behavior were reported and were noted in teacher interviews; (3) participation in the ESTL program did not positively impact student learning; (4) unanticipated findings include the role of camaraderie in professional development and the role of additional training in teacher's confidence in both their own teaching and in helping others; and, (5) teacher's perceptions identified the role of inquiry-based science curriculum as providing the rich experiences necessary for improved student writing. Overall participation in the ESTL program increased the implementation of inquiry-oriented strategies and it strengthened teacher inquiry-based science teaching in the classroom even though no increases were found in student test scores.

The Factors that Affect Science Teachers' Participation in Professional Development

NASA Astrophysics Data System (ADS)

Roux, Judi Ann

Scientific literacy for our students and the possibilities for careers available in Science, Technology, Engineering, and Mathematics (STEM) areas are important topics for economic growth as well as global competitiveness. The achievement of students in science learning is dependent upon the science teachers' effectiveness and experienced science teachers depend upon relevant professional development experiences to support their learning. In order to understand how to improve student learning in science, the learning of science teachers must also be understood. Previous research studies on teacher professional development have been conducted in other states, but Minnesota science teachers comprised a new and different population from those previously studied. The purpose of this two-phase mixed methods study was to identify the current types of professional development in which experienced, Minnesota secondary science teachers participated and the factors that affect their participation in professional development activities. The mixed-methods approach s utilized an initial online survey followed by qualitative interviews with five survey respondents. The results of the quantitative survey and the qualitative interviews indicated the quality of professional development experiences and the factors which affected the science teachers' participation in professional development activities. The supporting and inhibiting factors involved the availability of resources such as time and money, external relationships with school administrators, teacher colleagues, and family members, and personal intrinsic attributes such as desires to learn and help students. This study also describes implications for science teachers, school administrators, policymakers, and professional development providers. Recommendations for future research include the following areas: relationships between and among intrinsic and extrinsic factors, science-related professional development activities within local school districts, the use of formal and informal professional development, and the needs of rural science teachers compared to urban and suburban teachers.

How to Become a Broker: The Role of Teacher Educators in Developing Collaborative Teacher Research Teams

ERIC Educational Resources Information Center

Willegems, Vicky; Consuegra, Els; Struyven, Katrien; Engels, Nadine

2016-01-01

This study explores how teacher educators involved in developing collaborative teacher research teams of pre-service and in-service teachers perceive their new role. Ten teacher educators in 9 teams were involved in a 1-year teacher research cycle. Thematic analysis was performed on the transcriptions of audio-taped group sessions, video diaries…

Time-Resolved Properties and Global Trends in dMe Flares from Simultaneous Photometry and Spectra

NASA Astrophysics Data System (ADS)

Kowalski, Adam F.

We present a homogeneous survey of near-ultraviolet (NUV) /optical line and continuum emission during twenty M dwarf flares with simultaneous, high cadence photometry and spectra. These data were obtained to study the white-light continuum components to the blue and red of the Balmer jump to break the degeneracy with fitting emission mechanisms to broadband colors and to provide constraints for radiative-hydrodynamic flare models that seek to reproduce the white-light flare emission. The main results from the continuum analysis are the following: 1) the detection of Balmer continuum (in emission) that is present during all flares, with a wide range of relative contribution to the continuum flux in the NUV; 2) a blue continuum at the peak of the photometry that is linear with wavelength from λ = 4000 - 4800Å, matched by the spectral shape of hot, blackbody emission with typical temperatures of 10 000 - 12 000 K; 3) a redder continuum apparent at wavelengths longer than Hβ; this continuum becomes relatively more important to the energy budget during the late gradual phase. The hot blackbody component and redder continuum component (which we call "the conundruum") have been detected in previous UBVR colorimetry studies of flares. With spectra, one can compare the properties and detailed timings of all three components. Using time-resolved spectra during the rise phase of three flares, we calculate the speed of an expanding flare region assuming a simple geometry; the speeds are found to be ~5- 10 km s-1 and 50 - 120 km s -1, which are strikingly consistent with the speeds at which two-ribbon flares develop on the Sun. The main results from the emission line analysis are 1) the presentation of the "time-decrement", a relation between the timescales of the Balmer series; 2) a Neupert-like relation between Ca \\pcy K and the blackbody continuum, and 3) the detection of absorption wings in the Hydrogen Balmer lines during times of peak continuum emission, indicative of hot-star spectra forming during the flare. A byproduct of this study is a new method for deriving absolute fluxes during M dwarf flare observations obtained from narrow-slit spectra or during variable weather conditions. This technique allows us to analyze the spectra and photometry independently of one another, in order to connect the spectral properties to the rise, peak, and decay phases of broadband light curve morphology. We classify the light curve morphology according to an "impulsiveness index" and find that the fast (impulsive) flares have less Balmer continuum at peak emission than the slow (gradual) flares. In the gradual phase, the energy budget of the flare spectrum during almost all flares has a larger contribution from the Hydrogen Balmer component than in the impulsive phase, suggesting that the heating and cooling processes evolve over the course of a flare. We find that, in general, the evolution of the hot blackbody is rapid, and that the blackbody temperature decreases to ~8000 K in the gradual phase. The Balmer continuum evolves more slowly than the blackbody ¨C similar to the higher order Balmer lines but faster than the lower order Balmer lines. The height of the Balmer jump increases during the gradual decay phase. We model the Balmer continuum emission using the RHD F11 model spectrum from Allred et al. (2006), but we discuss several important systematic uncertainties in relating the apparent amount of Balmer continuum to a given RHD beam model. Good fits to the shape of the RHD F11 model spectrum are not obtained at peak times, in contrast to the gradual phase. We model the blackbody component using model hot star atmospheres from Castelli & Kurucz (2004) in order to account for the effects of flux redistribution in the flare atmosphere. This modeling is motivated by observations during a secondary flare in the decay phase of a megaflare, when the newly formed flare spectrum resembled that of Vega with the Balmer continuum and lines in absorption. We model this continuum phenomenologically with the RH code using hot spots placed at high column mass in the M dwarf quiescent atmosphere; a superposition of hot spot models and the RHD model are used to explain the anti-correlation in the apparent amount of Balmer continuum in emission and the U-band light curve. We attempt to reproduce the blackbody component in self-consistent 1D radiative hydrodynamic flare models using the RADYN code. We simulate the flare using a solar-type nonthermal electron beam heating function with a total energy flux of 1012 ergs cm-2 s-1 (F12) for a duration of 5 seconds and a subsequent gradual phase. Although there is a larger amount of NUV backwarming at log mc/(1g cm-2)~0 than in the F11 model, the resulting flare continuum shape is similar to the F11 model spectrum with a larger Balmer jump and a much redder spectral shape than is seen in the observations. We do not find evidence of white-light emitting chromospheric condensations, in contrast to the previous F12 model of Livshits et al. (1981). We discuss future avenues for RHD modeling in order to produce a hot blackbody component, including the treatment of nonthermal protons in M dwarf flares.

Middle Level Mathematics Teachers' Self-Efficacy Growth through Professional Development: Differences Based on Mathematical Background

ERIC Educational Resources Information Center

Stevens, Tara; Aguirre-Munoz, Zenaida; Harris, Gary; Higgins, Raegan; Liu, Xun

2013-01-01

growth of teachers with more and less mathematics background as the teachers participated in professional development across two summers. Professional development activities were associated with increases in teachers' self-efficacy; however, without considering mathematics…

Atomistic to continuum modeling of solidification microstructures

DOE PAGES

Karma, Alain; Tourret, Damien

2015-09-26

We summarize recent advances in modeling of solidification microstructures using computational methods that bridge atomistic to continuum scales. We first discuss progress in atomistic modeling of equilibrium and non-equilibrium solid–liquid interface properties influencing microstructure formation, as well as interface coalescence phenomena influencing the late stages of solidification. The latter is relevant in the context of hot tearing reviewed in the article by M. Rappaz in this issue. We then discuss progress to model microstructures on a continuum scale using phase-field methods. We focus on selected examples in which modeling of 3D cellular and dendritic microstructures has been directly linked tomore » experimental observations. Finally, we discuss a recently introduced coarse-grained dendritic needle network approach to simulate the formation of well-developed dendritic microstructures. The approach reliably bridges the well-separated scales traditionally simulated by phase-field and grain structure models, hence opening new avenues for quantitative modeling of complex intra- and inter-grain dynamical interactions on a grain scale.« less

Blunt Body Aerodynamics for Hypersonic Low Density Flows

NASA Technical Reports Server (NTRS)

Moss, James N.; Glass, Christopher E.; Greene, Francis A.

2006-01-01

Numerical simulations are performed for the Apollo capsule from the hypersonic rarefied to the continuum regimes. The focus is on flow conditions similar to those experienced by the Apollo 6 Command Module during the high altitude portion of its reentry. The present focus is to highlight some of the current activities that serve as a precursor for computational tool assessments that will be used to support the development of aerodynamic data bases for future capsule flight environments, particularly those for the Crew Exploration Vehicle (CEV). Results for aerodynamic forces and moments are presented that demonstrate their sensitivity to rarefaction; that is, free molecular to continuum conditions. Also, aerodynamic data are presented that shows their sensitivity to a range of reentry velocities, encompassing conditions that include reentry from low Earth orbit, lunar return, and Mars return velocities (7.7 to 15 km/s). The rarefied results obtained with direct simulation Monte Carlo (DSMC) codes are anchored in the continuum regime with data from Navier-Stokes simulations.

Caring Across the Continuum: A Call to Nurse Leaders to Manifest Values Through Action With Community Outreach.

PubMed

Dyess, Susan MacLeod; Opalinski, Andra; Saiswick, Kim; Fox, Valerie

2016-01-01

As health reform continues to advance, there is a need for nurse leaders to broaden their perspective related to possible nursing practice models and potential community partners in order to successfully address caring, accomplish the triple aim mandate, and achieve suitable metrics for maximum reimbursement. Intentional efforts must be made by nurse leaders to maximize caring and ensure that professional nurses are responding to the key drivers shifting health care delivery in the 21st century. Academic-practice collaboration (APC) and community-based participatory action research (CBPAR) align well. Together, they provide an ideal mechanism to pursue endeavors that extend evidence for caring services across the health care continuum. One APC/CBPAR model for community outreach that can maximize individual and population health outcomes is highlighted in this article. Furthermore, useful action steps are offered that could be taken by a nurse leader to develop and maintain any form of APC/CBPAR in order to manifest values through caring action across the health care continuum.

New Developments in the Embedded Statistical Coupling Method: Atomistic/Continuum Crack Propagation

NASA Technical Reports Server (NTRS)

Saether, E.; Yamakov, V.; Glaessgen, E.

2008-01-01

A concurrent multiscale modeling methodology that embeds a molecular dynamics (MD) region within a finite element (FEM) domain has been enhanced. The concurrent MD-FEM coupling methodology uses statistical averaging of the deformation of the atomistic MD domain to provide interface displacement boundary conditions to the surrounding continuum FEM region, which, in turn, generates interface reaction forces that are applied as piecewise constant traction boundary conditions to the MD domain. The enhancement is based on the addition of molecular dynamics-based cohesive zone model (CZM) elements near the MD-FEM interface. The CZM elements are a continuum interpretation of the traction-displacement relationships taken from MD simulations using Cohesive Zone Volume Elements (CZVE). The addition of CZM elements to the concurrent MD-FEM analysis provides a consistent set of atomistically-based cohesive properties within the finite element region near the growing crack. Another set of CZVEs are then used to extract revised CZM relationships from the enhanced embedded statistical coupling method (ESCM) simulation of an edge crack under uniaxial loading.

Constitutive Modeling of Nanotube-Reinforced Polymer Composites

NASA Technical Reports Server (NTRS)

Odegard, G. M.; Gates, T. S.; Wise, K. E.; Park, C.; Siochi, E. J.; Bushnell, Dennis M. (Technical Monitor)

2002-01-01

In this study, a technique is presented for developing constitutive models for polymer composite systems reinforced with single-walled carbon nanotubes (SWNT). Because the polymer molecules are on the same size scale as the nanotubes, the interaction at the polymer/nanotube interface is highly dependent on the local molecular structure and bonding. At these small length scales, the lattice structures of the nanotube and polymer chains cannot be considered continuous, and the bulk mechanical properties can no longer be determined through traditional micromechanical approaches that are formulated by using continuum mechanics. It is proposed herein that the nanotube, the local polymer near the nanotube, and the nanotube/polymer interface can be modeled as an effective continuum fiber using an equivalent-continuum modeling method. The effective fiber serves as a means for incorporating micromechanical analyses for the prediction of bulk mechanical properties of SWNT/polymer composites with various nanotube lengths, concentrations, and orientations. As an example, the proposed approach is used for the constitutive modeling of two SWNT/polyimide composite systems.

A comparative study of turbulence decay using Navier-Stokes and a discrete particle simulation

NASA Technical Reports Server (NTRS)

Goswami, A.; Baganoff, D.; Lele, S.; Feiereisen, W.

1993-01-01

A comparative study of the two dimensional temporal decay of an initial turbulent state of flow is presented using a direct Navier-Stokes simulation and a particle method, ranging from the near continuum to more rarefied regimes. Various topics related to matching the initial conditions between the two simulations are considered. The determination of the initial velocity distribution function in the particle method was found to play an important role in the comparison. This distribution was first developed by matching the initial Navier-Stokes state of stress, but was found to be inadequate beyond the near continuum regime. An alternative approach of using the Lees two-sided Maxwellian to match the initial strain-rate is discussed. Results of the comparison of the temporal decay of mean kinetic energy are presented for a range of Knudsen numbers. As expected, good agreement was observed for the near continuum regime, but the differences found for the more rarefied conditions were unexpectedly small.

Multiscale synchrony behaviors of paired financial time series by 3D multi-continuum percolation

NASA Astrophysics Data System (ADS)

Wang, M.; Wang, J.; Wang, B. T.

2018-02-01

Multiscale synchrony behaviors and nonlinear dynamics of paired financial time series are investigated, in an attempt to study the cross correlation relationships between two stock markets. A random stock price model is developed by a new system called three-dimensional (3D) multi-continuum percolation system, which is utilized to imitate the formation mechanism of price dynamics and explain the nonlinear behaviors found in financial time series. We assume that the price fluctuations are caused by the spread of investment information. The cluster of 3D multi-continuum percolation represents the cluster of investors who share the same investment attitude. In this paper, we focus on the paired return series, the paired volatility series, and the paired intrinsic mode functions which are decomposed by empirical mode decomposition. A new cross recurrence quantification analysis is put forward, combining with multiscale cross-sample entropy, to investigate the multiscale synchrony of these paired series from the proposed model. The corresponding research is also carried out for two China stock markets as comparison.

Small-scale plasticity critically needs a new mechanics description

NASA Astrophysics Data System (ADS)

Ngan, Alfonso H. W.

2013-06-01

Continuum constitutive laws describe the plastic deformation of materials as a smooth, continuously differentiable process. However, provided that the measurement is done with a fine enough resolution, the plastic deformation of real materials is often found to comprise discrete events usually nanometric in size. For bulk-sized specimens, such nanoscale events are minute compared with the specimen size, and so their associated strain changes are negligibly small, and this is why the continuum laws work well. However, when the specimen size is in the micrometer scale or smaller, the strain changes due to the discrete events could be significant, and the continuum description would be highly unsatisfactory. Yet, because of the advent of microtechnology and nanotechnolgy, small-sized materials will be increasingly used, and so there is a strong need to develop suitable replacement descriptions for plasticity of small materials. As the occurrence of the discrete plastic events is also strongly stochastic, their satisfactory description should also be one of a probabilistic, rather than deterministic, nature.

Model of fracture of metal melts and the strength of melts under dynamic conditions

NASA Astrophysics Data System (ADS)

Mayer, P. N.; Mayer, A. E.

2015-07-01

The development of a continuum model of deformation and fracture of melts is needed for the description of the behavior of metals in extreme states, in particular, under high-current electron and ultrashort laser irradiation. The model proposed includes the equations of mechanics of a two-phase continuum and the equations of the kinetics of phase transitions. The change (exchange) of the volumes of dispersed and carrier phases and of the number of dispersed particles is described, and the energy and mass exchange between the phases due to phase transitions is taken into account. Molecular dynamic (MD) calculations are carried out with the use of the LAMMPS program. The continuum model is verified by MD, computational, and experimental data. The strength of aluminum, copper, and nickel is determined at various temperatures and strain rates. It is shown that an increase in the strain rate leads to an increase in the strength of a liquid metal, while an increase in temperature leads to a decrease in its strength.

Understanding adolescent type 1 diabetes self-management as an adaptive process: A grounded theory approach.

PubMed

Chilton, Roy; Pires-Yfantouda, Renata

2015-01-01

To develop a conceptual understanding of the process of adapting to the self-management of type 1 diabetes during adolescence. Participants were recruited from a National Health Service paediatric diabetes service within the south-west of England which runs six countywide diabetes clinics. Thirteen interviews were conducted using a social constructivist grounded theory approach. The findings illustrate how self-management can be understood in terms of a continuum-based framework, ranging from difficulties with, to successful self-management. Adaptation within the continuum can further be understood by specific transitional phases and process mechanisms, providing further depth to individuals' experiences of adaptation. This investigation provides a conceptual understanding of the complex issues adolescents encounter while adapting to and integrating a diabetes self-management regime into their lives. It provides an invaluable framework for exploring psychological mechanisms and contextualising them within a self-management continuum. Implications for healthcare professionals are discussed and further research proposes whether the model could be applicable to other chronic illnesses.

Derivation of a continuum model and the energy law for moving contact lines with insoluble surfactants

DOE Office of Scientific and Technical Information (OSTI.GOV)

Zhang, Zhen, E-mail: matzz@nus.edu.sg; Xu, Shixin, E-mail: matxs@nus.edu.sg; Ren, Weiqing, E-mail: matrw@nus.edu.sg

2014-06-15

A continuous model is derived for the dynamics of two immiscible fluids with moving contact lines and insoluble surfactants based on thermodynamic principles. The continuum model consists of the Navier-Stokes equations for the dynamics of the two fluids and a convection-diffusion equation for the evolution of the surfactant on the fluid interface. The interface condition, the boundary condition for the slip velocity, and the condition for the dynamic contact angle are derived from the consideration of energy dissipations. Different types of energy dissipations, including the viscous dissipation, the dissipations on the solid wall and at the contact line, as wellmore » as the dissipation due to the diffusion of surfactant, are identified from the analysis. A finite element method is developed for the continuum model. Numerical experiments are performed to demonstrate the influence of surfactant on the contact line dynamics. The different types of energy dissipations are compared numerically.« less

Changing public stigma with continuum beliefs.

PubMed

Corrigan, Patrick W; Schmidt, Annie; Bink, Andrea B; Nieweglowski, Katherine; Al-Khouja, Maya A; Qin, Sang; Discont, Steve

2017-10-01

Given the egregious effect of public stigma on the lives of people with mental illness, researchers have sought to unpack and identify effective components of anti-stigma programs. We expect to show that continuum messages have more positive effect on stigma and affirming attitudes (beliefs that people with mental illness recover and should be personally empowered) than categorical perspectives. The effect of continuum beliefs will interact with contact strategies. A total of 598 research participants were randomly assigned to online presentations representing one of the six conditions: three messages (continuum, categorical, or neutral control) by two processes (education or contact). Participants completed measures of continuum beliefs (as a manipulation check), stigma and affirming attitudes after viewing the condition. Continuum messages had significantly better effect on views that people with mental illness are "different," a finding that interacted with contact. Continuum messages also had better effects on recovery beliefs, once again an effect that interacted significantly with contact. Implications of these findings for improving anti-stigma programs are discussed.

Explore-create-share study: An evaluation of teachers as curriculum innovators in engineering education

NASA Astrophysics Data System (ADS)

Berry, Ayora

The purpose of this study was to investigate the effects of a curriculum design-based (CDB) professional development model on K-12 teachers' capacity to integrate engineering education in the classroom. This teacher professional development approach differs from other training programs where teachers learn how to use a standard curriculum and adopt it in their classrooms. In a CDB professional development model teachers actively design lessons, student resources, and assessments for their classroom instruction. In other science, technology, engineering and mathematics (STEM) disciplines, CDB professional development has been reported to (a) position teachers as architects of change, (b) provide a professional learning vehicle for educators to reflect on instructional practices and develop content knowledge, (c) inspire a sense of ownership in curriculum decision-making among teachers, and (d) use an instructional approach that is coherent with teachers' interests and professional goals. The CDB professional development program in this study used the Explore-Create-Share (ECS) framework as an instructional model to support teacher-led curriculum design and implementation. To evaluate the impact of the CDB professional development and associated ECS instructional model, three research studies were conducted. In each study, the participants completed a six-month CDB professional development program, the PTC STEM Certificate Program, that included sixty-two instructional contact hours. Participants learned about industry and education engineering concepts, tested engineering curricula, collaborated with K-12 educators and industry professionals, and developed project-based engineering curricula using the ECS framework. The first study evaluated the impact of the CDB professional development program on teachers' engineering knowledge, self-efficacy in designing engineering curriculum, and instructional practice in developing project-based engineering units. The study included twenty-six teachers and data was collected pre-, mid-, and post-program using teacher surveys and a curriculum analysis instrument. The second study evaluated teachers' perceptions of the ECS model as a curriculum authoring tool and the quality of the curriculum units they developed. The study included sixty-two participants and data was collected post-program using teacher surveys and a curriculum analysis instrument. The third study evaluated teachers' experiences implementing ECS units in the classroom with a focus on identifying the benefits, challenges and solutions associated with project-based engineering in the classroom. The study included thirty-one participants and data was collected using an open-ended survey instrument after teachers completed implementation of the ECS curriculum unit. Results of these three studies indicate that teachers can be prepared to integrate engineering in the classroom using a CDB professional development model. Teachers reported an increase in engineering content knowledge, improved their self-efficacy in curriculum planning, and developed high quality instructional units that were aligned to engineering design practices and STEM educational standards. The ECS instructional model was acknowledged as a valuable tool for developing and implementing engineering education in the classroom. Teachers reported that ECS curriculum design aligned with their teaching goals, provided a framework to integrate engineering with other subject-area concepts, and incorporated innovative teaching strategies. After implementing ECS units in the classroom, teachers reported that the ECS model engaged students in engineering design challenges that were situated in a real world context and required the application of interdisciplinary content knowledge and skills. Teachers also reported a number of challenges related to scheduling, content alignment, and access to resources. In the face of these obstacles, teachers presented a number of solutions that included optimization of one's teaching practice, being resource savvy, and adopting a growth mindset.

In-service and pre-service teacher education in IBSE: The ESTABLISH approach

NASA Astrophysics Data System (ADS)

Ješková, Zuzana; Kireš, Marián; McLoughlin, Eilish; Finlayson, Odilla; Ottander, Christina; Ekborg, Margareta

2016-05-01

One of the main goals of the ESTABLISH 7fp project (available on line at http://www.establish-fp7.eu/) was the development and implementation of the professional development teacher education programmes (TEP) to support teachers in adopting inquiry-based strategies in their teaching. Within the project there was a model for in-service and pre-service teacher training in IBSE designed and implemented across 12 participating countries. The programme is based on 4 core elements and 4 additional elements that are built around the IBSE teaching units developed within the project. As accepted by ESTABLISH partners, all teacher training programmes include the minimum of the four elements, i.e. introduction to IBSE, industrial content knowledge, teacher as implementer and teacher as developer of IBSE teaching materials. There are also four additional elements designed in detail, i.e. ICT for IBSE, argumentation in the classroom, research and design projects for students, assessment of IBSE. These can be added to the programme optionally with regard to the level of teachers' IBSE skills and current situation in education and teachers' professional development within the country. This ESTABLISH model of TEP was followed in participating countries in order to change teachers' attitudes from traditional ways of teaching towards adopting inquiry strategies and their successful implementation in the classroom. Within the face-to-face workshops teachers experienced and developed their inquiry based teaching strategies using specifically developed materials. In addition, the e-platform has been developed to provide on-line support. This platform provides educators and teachers with all the necessary materials for the training and IBSE teaching units and other teaching materials for teachers' ongoing help. The teacher training programme was successfully implemented in Slovakia. There were two runs of teacher training workshops on IBSE already carried out. Moreover, the additional element ICT in IBSE was developed more deeply designing a separate teacher training course for it. The contribution discusses in more details the success and problems of implementation in the context of Slovak educational environment.

Care pathways across the primary-hospital care continuum: using the multi-level framework in explaining care coordination

PubMed Central

2013-01-01

Background Care pathways are widely used in hospitals for a structured and detailed planning of the care process. There is a growing interest in extending care pathways into primary care to improve quality of care by increasing care coordination. Evidence is sparse about the relationship between care pathways and care coordination. The multi-level framework explores care coordination across organizations and states that (inter)organizational mechanisms have an effect on the relationships between healthcare professionals, resulting in quality and efficiency of care. The aim of this study was to assess the extent to which care pathways support or create elements of the multi-level framework necessary to improve care coordination across the primary - hospital care continuum. Methods This study is an in-depth analysis of five existing local community projects located in four different regions in Flanders (Belgium) to determine whether the available empirical evidence supported or refuted the theoretical expectations from the multi-level framework. Data were gathered using mixed methods, including structured face-to-face interviews, participant observations, documentation and a focus group. Multiple cases were analyzed performing a cross case synthesis to strengthen the results. Results The development of a care pathway across the primary-hospital care continuum, supported by a step-by-step scenario, led to the use of existing and newly constructed structures, data monitoring and the development of information tools. The construction and use of these inter-organizational mechanisms had a positive effect on exchanging information, formulating and sharing goals, defining and knowing each other’s roles, expectations and competences and building qualitative relationships. Conclusion Care pathways across the primary-hospital care continuum enhance the components of care coordination. PMID:23919518

Care pathways across the primary-hospital care continuum: using the multi-level framework in explaining care coordination.

PubMed

Van Houdt, Sabine; Heyrman, Jan; Vanhaecht, Kris; Sermeus, Walter; De Lepeleire, Jan

2013-08-06

Care pathways are widely used in hospitals for a structured and detailed planning of the care process. There is a growing interest in extending care pathways into primary care to improve quality of care by increasing care coordination. Evidence is sparse about the relationship between care pathways and care coordination.The multi-level framework explores care coordination across organizations and states that (inter)organizational mechanisms have an effect on the relationships between healthcare professionals, resulting in quality and efficiency of care.The aim of this study was to assess the extent to which care pathways support or create elements of the multi-level framework necessary to improve care coordination across the primary-hospital care continuum. This study is an in-depth analysis of five existing local community projects located in four different regions in Flanders (Belgium) to determine whether the available empirical evidence supported or refuted the theoretical expectations from the multi-level framework. Data were gathered using mixed methods, including structured face-to-face interviews, participant observations, documentation and a focus group. Multiple cases were analyzed performing a cross case synthesis to strengthen the results. The development of a care pathway across the primary-hospital care continuum, supported by a step-by-step scenario, led to the use of existing and newly constructed structures, data monitoring and the development of information tools. The construction and use of these inter-organizational mechanisms had a positive effect on exchanging information, formulating and sharing goals, defining and knowing each other's roles, expectations and competences and building qualitative relationships. Care pathways across the primary-hospital care continuum enhance the components of care coordination.

The First Interlaced Continuum Robot, Devised to Intrinsically Follow the Leader

PubMed Central

Kang, Byungjeon; Kojcev, Risto; Sinibaldi, Edoardo

2016-01-01

Flexible probes that are safely deployed to hard-to-reach targets while avoiding critical structures are strategic in several high-impact application fields, including the biomedical sector and the sector of inspections at large. A critical problem for these tools is the best approach for deploying an entire tool body, not only its tip, on a sought trajectory. A probe that achieves this deployment is considered to follow the leader (or to achieve follow-the-leader deployment) because its body sections follow the track traced by its tip. Follow-the-leader deployment through cavities is complicated due to a lack of external supports. Currently, no definitive implementation for a probe that is intrinsically able to follow the leader, i.e., without relying on external supports, has been achieved. In this paper, we present a completely new device, namely the first interlaced continuum robot, devised to intrinsically follow the leader. We developed the interlaced configuration by pursuing a conceptual approach irrespective of application-specific constraints and assuming two flexible tools with controllable stiffness. We questioned the possibility of solving the previously mentioned deployment problem by harnessing probe symmetry during the design process. This study examines the entire development of the novel interlaced probe: model-based conceptual design, detailed design and prototyping, and preliminary experimental assessment. Our probe can build a track with a radius of curvature that is as small as twice the probe diameter, which enables it to outperform state-of-the-art tools that are aimed at follow-the-leader deployment. Despite the limitations that are inherently associated with its original character, this study provides a prototypical approach to the design of interlaced continuum systems and demonstrates the first interlaced continuum probe, which is intrinsically able to follow the leader. PMID:26914328

Multiscale modeling of lithium ion batteries: thermal aspects

PubMed Central

Zausch, Jochen

2015-01-01

Summary The thermal behavior of lithium ion batteries has a huge impact on their lifetime and the initiation of degradation processes. The development of hot spots or large local overpotentials leading, e.g., to lithium metal deposition depends on material properties as well as on the nano- und microstructure of the electrodes. In recent years a theoretical structure emerges, which opens the possibility to establish a systematic modeling strategy from atomistic to continuum scale to capture and couple the relevant phenomena on each scale. We outline the building blocks for such a systematic approach and discuss in detail a rigorous approach for the continuum scale based on rational thermodynamics and homogenization theories. Our focus is on the development of a systematic thermodynamically consistent theory for thermal phenomena in batteries at the microstructure scale and at the cell scale. We discuss the importance of carefully defining the continuum fields for being able to compare seemingly different phenomenological theories and for obtaining rules to determine unknown parameters of the theory by experiments or lower-scale theories. The resulting continuum models for the microscopic and the cell scale are numerically solved in full 3D resolution. The complex very localized distributions of heat sources in a microstructure of a battery and the problems of mapping these localized sources on an averaged porous electrode model are discussed by comparing the detailed 3D microstructure-resolved simulations of the heat distribution with the result of the upscaled porous electrode model. It is shown, that not all heat sources that exist on the microstructure scale are represented in the averaged theory due to subtle cancellation effects of interface and bulk heat sources. Nevertheless, we find that in special cases the averaged thermal behavior can be captured very well by porous electrode theory. PMID:25977870

The First Interlaced Continuum Robot, Devised to Intrinsically Follow the Leader.

PubMed

Kang, Byungjeon; Kojcev, Risto; Sinibaldi, Edoardo

2016-01-01

Flexible probes that are safely deployed to hard-to-reach targets while avoiding critical structures are strategic in several high-impact application fields, including the biomedical sector and the sector of inspections at large. A critical problem for these tools is the best approach for deploying an entire tool body, not only its tip, on a sought trajectory. A probe that achieves this deployment is considered to follow the leader (or to achieve follow-the-leader deployment) because its body sections follow the track traced by its tip. Follow-the-leader deployment through cavities is complicated due to a lack of external supports. Currently, no definitive implementation for a probe that is intrinsically able to follow the leader, i.e., without relying on external supports, has been achieved. In this paper, we present a completely new device, namely the first interlaced continuum robot, devised to intrinsically follow the leader. We developed the interlaced configuration by pursuing a conceptual approach irrespective of application-specific constraints and assuming two flexible tools with controllable stiffness. We questioned the possibility of solving the previously mentioned deployment problem by harnessing probe symmetry during the design process. This study examines the entire development of the novel interlaced probe: model-based conceptual design, detailed design and prototyping, and preliminary experimental assessment. Our probe can build a track with a radius of curvature that is as small as twice the probe diameter, which enables it to outperform state-of-the-art tools that are aimed at follow-the-leader deployment. Despite the limitations that are inherently associated with its original character, this study provides a prototypical approach to the design of interlaced continuum systems and demonstrates the first interlaced continuum probe, which is intrinsically able to follow the leader.

Airborne spectrophotometry of SN 1987A from 1.7 to 12.6 microns - Time history of the dust continuum and line emission

NASA Technical Reports Server (NTRS)

Wooden, Diane H.; Rank, David M.; Bregman, Jesse D.; Witteborn, Fred C.; Tielens, A. G. G. M.; Cohen, Martin; Pinto, Philip A.; Axelrod, Timothy S.

1993-01-01

Spectrophotometric observations of SN 1987A from the Kuiper Airborne Observatory are presented for five epochs at 60, 260, 415, 615, and 775 days after the explosion. The low-resolution (lambda/Delta lambda = 50-100) spectra of SN 1987A are combined with data from other wavelengths to model the continuum, subtract the continuum from the spectra to determine line strengths and reveal molecular bands, separate the atomic continuum radiation from the dust continuum, and derive constraints on the grain temperatures and optical depths. A scenario for the evolution of SN 1987A and that of the ejecta from which it arises is obtained on the basis of the analysis of the continuum emission.

Teacher Research at the Middle Level: Strengthening the Essential Attributes of Education for Young Adolescents

ERIC Educational Resources Information Center

DiLucchio, Connie; Leaman, Heather; Elicker, Kathleen; Mathisen, Denise

2014-01-01

Teacher research (practitioner inquiry) is an effective form of professional development for middle level teachers. Through teacher research, classroom teachers develop the skills needed to demonstrate mastery of the performance standards for middle level master teacher candidates. Using well-established research methods, middle level educators…

Well Facilitated Shoptalk as Democratic Professional Development for Teachers of English Language Learners

ERIC Educational Resources Information Center

Cunningham, Thomas H.; Parnell, Gary L.

2007-01-01

Democratic professional development is of the teachers, by the teachers, for the teachers. It differs from managerial models, which often have preset agendas and provide what "experts" think teachers need. Managerial models tend to be leader-centered, making some teachers feel treated like "tall children" rather than…

Teacher Development Program: A Vehicle for Assisting Pre-Service Teachers

ERIC Educational Resources Information Center

Wood, Frances B.

2010-01-01

In 1990 the Teacher Development Program was created by the Office of Professional Field Experiences at Southeastern Louisiana University to better the quality and improve the success rate of teacher candidates and student teachers. The fundamental principle behind the program was to provide assistance for pre-service teachers who need immediate…

Beginning Science Teachers' Use of a Digital Video Annotation Tool to Promote Reflective Practices

ERIC Educational Resources Information Center

McFadden, Justin; Ellis, Joshua; Anwar, Tasneem; Roehrig, Gillian

2014-01-01

The development of teachers as reflective practitioners is a central concept in national guidelines for teacher preparation and induction (National Council for Accreditation of Teacher Education 2008). The Teacher Induction Network (TIN) supports the development of reflective practice for beginning secondary science teachers through the creation…

How Teachers' Beliefs about Learning and Teaching Relate to Their Continuing Professional Development

ERIC Educational Resources Information Center

de Vries, Siebrich; van de Grift, Wim J. C. M.; Jansen, Ellen P. W. A.

2014-01-01

Teachers' continuing professional development (CPD) can improve teacher quality and teaching practice, yet teachers differ greatly in the extent to which they engage in CPD. In extensive research into which factors affect teachers' participation in CPD, the effects of teachers' beliefs have received limited attention, despite their strong…

Beginning Secondary Science Teacher Induction: A Two-Year Mixed Methods Study

ERIC Educational Resources Information Center

Luft, Julie A.; Firestone, Jonah B.; Wong, Sissy S.; Ortega, Ira; Adams, Krista; Bang, EunJin

2011-01-01

Those who study secondary science teachers are often concerned with preservice or in-service teacher development. Science teacher educators have acknowledged that this focus is limited, as the induction years of beginning teachers are an important component of teacher development. This mixed methods study focuses on the induction years of…

Professional Development Activities and Support among Physical Education Teachers in the United States

ERIC Educational Resources Information Center

Cardina, Catherine E.; DeNysschen, Carol

2018-01-01

Purpose: This study described professional development (PD) among public school physical education (PE) teachers and compared PE teachers to teachers of other subjects. Method: Data were collected from a nationally representative sample of public school teachers in the United States. Descriptive statistics were used to describe teachers' support…

Long-Term Care for People with Development Disabilities: A Critical Analysis.

ERIC Educational Resources Information Center

Palley, Howard A.; Van Hollen, Valerie

2000-01-01

Explores how the trends toward long-term community care affecting people with developmental disabilities developed. Appropriateness of care and quality of life issues are discussed. Reviews the development of long-term care for frail and disabled elderly people and explores the arguments for a continuum of care that have developed in this area.…

Managing Current Developments in SEN and Inclusion: Developing Confidence in New Teachers

ERIC Educational Resources Information Center

Richards, Gill

2010-01-01

Developments in special and inclusive education have lead to increasing challenges for teachers. Initial Teacher Education has struggled to keep pace with these developments and equip all newly qualified teachers with the skills required to meet the needs of children with SEN. This paper reflects upon recent national initiatives designed to…

Self-Directed Professional Development--Hope for Teachers Working in Deprived Environments?

ERIC Educational Resources Information Center

Mushayikwa, Emmanuel; Lubben, Fred

2009-01-01

Self-direction has been identified as a potential key to the success of professional development of teachers, especially those working in deprived environments. This paper develops a model for self-directed professional development using interview data from 55 Zimbabwean A-level Science and Mathematics teachers. It focuses on teachers' decisions…

Interrogating the Continuing Professional Development Policy Framework in Ethiopia: A Critical Discourse Analysis

ERIC Educational Resources Information Center

Akalu, Girmaw Abebe

2016-01-01

The continuing professional development (CPD) of teachers has increasingly come to be considered an important component of teacher policy reforms throughout much of the world. As part of its comprehensive school improvement and teacher development programmes, Ethiopia has recently developed a national policy framework on CPD for teachers. Arguing…

Assessing College Students' Perceptions of a Case Teacher's Pedagogical Content Knowledge Using a Newly Developed Instrument

ERIC Educational Resources Information Center

Jang, Syh-Jong

2011-01-01

Ongoing professional development for college teachers has been much emphasized. However, previous research on learning environments has seldom addressed college students' perceptions of teachers' PCK. This study aimed to evaluate college students' perceptions of a physics teacher's PCK development using a newly developed instrument and workshop…

The Investigation of Teachers' Metaphoric Perceptions about Professional Development

ERIC Educational Resources Information Center

Yurtseven, Nihal

2017-01-01

Professional development is an ongoing process in which teachers review their teaching practices and learn how to respond to their students' needs. To make the professional development process more effective, we need to define the identity of a teacher correctly and clarify the perspective about teachers' professional development. The purpose of…

24 CFR 91.315 - Strategic plan.

Code of Federal Regulations, 2014 CFR

2014-04-01

... concise summary of the jurisdiction's activities to enhance coordination among Continuums of Care, public... care (such as health-care facilities, mental health facilities, foster care and other youth facilities...), which must be developed in accordance with the primary objective of the CDBG program to develop viable...

24 CFR 91.315 - Strategic plan.

Code of Federal Regulations, 2013 CFR

2013-04-01

... concise summary of the jurisdiction's activities to enhance coordination among Continuums of Care, public... care (such as health-care facilities, mental health facilities, foster care and other youth facilities...), which must be developed in accordance with the primary objective of the CDBG program to develop viable...

24 CFR 91.315 - Strategic plan.

Code of Federal Regulations, 2012 CFR

2012-04-01

... concise summary of the jurisdiction's activities to enhance coordination among Continuums of Care, public... care (such as health-care facilities, mental health facilities, foster care and other youth facilities...), which must be developed in accordance with the primary objective of the CDBG program to develop viable...

Continuous Professional Development along the Continuum of Lifelong Learning.

ERIC Educational Resources Information Center

Ryan, Jane

2003-01-01

Of 300 surveyed, responses from 94 nurses, 38 occupational therapists, and 50 physical therapists indicated that professional knowledge was a prime motivation for continuing professional development, followed by updating qualifications, increasing the status of the profession, and demonstrating professional competence. No differences were observed…

A Model for Predicting Grain Boundary Cracking in Polycrystalline Viscoplastic Materials Including Scale Effects

DOE Office of Scientific and Technical Information (OSTI.GOV)

Allen, D.H.; Helms, K.L.E.; Hurtado, L.D.

1999-04-06

A model is developed herein for predicting the mechanical response of inelastic crystalline solids. Particular emphasis is given to the development of microstructural damage along grain boundaries, and the interaction of this damage with intragranular inelasticity caused by dislocation dissipation mechanisms. The model is developed within the concepts of continuum mechanics, with special emphasis on the development of internal boundaries in the continuum by utilizing a cohesive zone model based on fracture mechanics. In addition, the crystalline grains are assumed to be characterized by nonlinear viscoplastic mechanical material behavior in order to account for dislocation generation and migration. Due tomore » the nonlinearities introduced by the crack growth and viscoplastic constitution, a numerical algorithm is utilized to solve representative problems. Implementation of the model to a finite element computational algorithm is therefore briefly described. Finally, sample calculations are presented for a polycrystalline titanium alloy with particular focus on effects of scale on the predicted response.« less

The Role of the Principal in New Teacher Development under the California Beginning Teacher Support & Assessment Program

ERIC Educational Resources Information Center

Pratt, Denise Marie

2010-01-01

There are several types of teacher induction programs that have been in existence for over the last ten years, such as university and school district in-house programs that have primarily carried the responsibility of developing new teachers. The responsibility of these structures in training and developing these beginning teachers has been…

The Effect of Professional Development on Teacher Efficacy and Teachers' Self-Analysis of Their Efficacy Change

ERIC Educational Resources Information Center

Yoo, Julia H.

2016-01-01

The current study examined the effect of an online professional development learning experience on teachers' self-efficacy through 148 (Male = 22; Female = 126) K-12 teachers and school educators. The Teachers' Self-Efficacy Scale (TSES) developed by Tschannen-Moran and Woolfolk Hoy (2001) was administered twice with a five-week gap. Additionally,…

An Examination of Teacher Perceptions of Professional Development through the Framework of Individual Personality Traits

ERIC Educational Resources Information Center

Burch, Stacie Quijada

2016-01-01

The emphasis placed on the need to develop and improve the skills of teachers in order to ensure that every child has a highly effective teacher has led to research that indicates that factors other than educational background and experience influence teacher behaviors. Research in the area of teacher development and learning indicated that…

Development and Evaluation of a Questionnaire Measuring Pre-Service Teachers' Teaching Behaviour: A Rasch Modelling Approach

ERIC Educational Resources Information Center

Maulana, Ridwan; Helms-Lorenz, Michelle; van de Grift, Wim

2015-01-01

The present study examines the development of a measure tapping students' perceptions of (pre-service) teachers' teaching behaviour to explore the practical value of such a measure in teacher education and teacher professional development programs. From a sample of 1,635 students of 91 pre-service teachers teaching in secondary education in The…

Female Teachers' Perception of Reflective Teaching as a Teacher Development Tool in the Saudi Context

ERIC Educational Resources Information Center

Shukri, Nadia

2014-01-01

Teacher development in the EFL context has been well-established in Western educational institutions. However, although there are some limited studies in the Middle East, it is still under-researched in Saudi Arabia. This study investigates the EFL teachers' perceptions of reflective teaching as a tool for teacher development and its challenges in…