WorldWideScience

Sample records for stallings classroom management

  1. Evaluating Classroom Interaction with the iPad®: An Updated Stalling's Tool

    Science.gov (United States)

    MacKinnon, Gregory; Schep, Lourens; Borden, Lisa Lunney; Murray-Orr, Anne; Orr, Jeff; MacKinnon, Paula

    2016-01-01

    A large study of classrooms in the Caribbean context necessitated the use of a validated classroom observation tool. In practice, the paper-version Stalling's instrument (Stallings & Kaskowitz 1974) presented specific challenges with respect to (a) facile data collection and (b) qualitative observations of classrooms. In response to these…

  2. Classroom Management in Elementary Mainstreaming Classrooms.

    Science.gov (United States)

    Borg, Walter R.; Ascione, Frank R.

    1982-01-01

    This research was aimed at adapting the Utah State University Classroom Management Program for use in elementary mainstreaming classrooms and evaluating the program's effectiveness in changing teacher and pupil behavior. The program appears to be powerful in changing teacher behavior and an effective classroom management training tool. (Author/AL)

  3. Managing Classroom Problems.

    Science.gov (United States)

    Long, James D.

    Schools need to meet unique problems through the development of special classroom management techniques. Factors which contribute to classroom problems include lack of supervision at home, broken homes, economic deprivation, and a desire for peer attention. The educational atmosphere should encourage creativity for both the student and the…

  4. Classroom Management and the Librarian

    Science.gov (United States)

    Blackburn, Heidi; Hays, Lauren

    2014-01-01

    As librarians take on more instructional responsibilities, the need for classroom management skills becomes vital. Unfortunately, classroom management skills are not taught in library school and therefore, many librarians are forced to learn how to manage a classroom on the job. Different classroom settings such as one-shot instruction sessions…

  5. Classroom Management and Learning.

    Science.gov (United States)

    Brophy, Jere E.

    1982-01-01

    Survey results show that planning and constant vigilance are the price of effective teaching. Effective classroom management involves awareness, good organizational skills, preparation, letting students know what is expected of them and following through, and the ability to diagnose student problems. (CT)

  6. Bibliotherapy for Classroom Management

    Science.gov (United States)

    Elsenman, Gordon; Harper, Rebecca

    2016-01-01

    The focus and goal of classroom management should be first and foremost learning. When trying to prevent interruptions to learning, or dealing with interruptions to learning when they occur, teachers need to move beyond simply imposing a consequence and assuming students have learned from the interaction. Students need to be taught the skills and…

  7. Effective Classroom Management

    Science.gov (United States)

    Mansor, Azlin Norhaini; Eng, Wong Kim; Rasul, Mohamad Sattar; Hamzah, Mohd Izham Mohd; Hamid, Aida Hanim A.

    2012-01-01

    This paper attempts to explore and identify the characteristics of an effective teacher who teaches English as a second language to 10 year old students from different ethnics, various social economic background and multi-level language ability, at a private primary school in Malaysia. The study focused on classroom management using a case study…

  8. Classroom Management: Implications for Supervision.

    Science.gov (United States)

    Garza, Gonzalo

    Classroom management may be the most fundamental and most difficult task the teacher performs. A search of the literature reveals at least five rather different definitions of classroom management that represent particular philosophical approaches: 1) the authoritarian approach, 2) the permissive approach, 3) the behavior modification approach, 4)…

  9. Concussion Management in the Classroom.

    Science.gov (United States)

    Graff, Danielle M; Caperell, Kerry S

    2016-12-01

    There is a new emphasis on the team approach to pediatric concussion management, particularly in the classroom. However, it is expected that educators are unfamiliar with the "Returning to Learning" recommendations. The authors' primary objective was to assess and improve high school educators' knowledge regarding concussions and management interventions using an online education tool. A total of 247 high school educators completed a 12 question pretest to assess core knowledge of concussions and classroom management followed by a 20-minute online literature-based education module. Participants then completed an identical posttest. The improvement in core knowledge was statistically significant (P classroom management also showed a statistically significant increase in scores (P classroom management as well as the significant improvement after an online educational module. © The Author(s) 2016.

  10. Classroom Management: What Does Research Tell Us?

    Science.gov (United States)

    Postholm, May Britt

    2013-01-01

    The article reviews studies that focus on classroom management. The aim of classroom management is twofold. The first is to establish a quiet and calm environment in the classroom so that the pupils can take part in meaningful learning in a subject. The second aim is that classroom management contributes to the pupils' social and moral…

  11. Classroom Management with Exceptional Learners

    Science.gov (United States)

    Myers, Diane; Freeman, Jennifer; Simonsen, Brandi; Sugai, George

    2017-01-01

    Effective and engaging instruction is the cornerstone of any well-managed classroom. Even the best behavior support practices will not lead to academic achievement if the academic instruction is ineffective. Specific teacher practices associated with improved student behavior include high rates of opportunities to respond, direct instruction, and…

  12. Psychology's Contributions to Classroom Management

    Science.gov (United States)

    Little, Steven G.; Akin-Little, Angeleque

    2008-01-01

    Classroom management (CRM) has been associated with discipline, control, or other terms that connote reducing unacceptable student behavior. However, CRM involves not merely responding effectively when problems occur, but also preventing problems from occurring by creating environments that encourage learning and appropriate behavior. Teachers'…

  13. Organizing and Managing a Whole Language Classroom.

    Science.gov (United States)

    Baumann, James F.

    1992-01-01

    Presents definitions of "whole language" and classroom organization/management. Describes several plans for organizing and managing a whole-language classroom. Presents a detailed example demonstrating how to organize and manage a whole-language primary classroom using a "modified blocked" approach. (SR)

  14. Routines Are the Foundation of Classroom Management

    Science.gov (United States)

    Lester, Robin Rawlings; Allanson, Patricia Bolton; Notar, Charles E.

    2017-01-01

    Classroom management is the key to learning. Routines are the foundation of classroom management. Students require structure in their lives. Routines provide that in all of their life from the time they awake until the time they go to bed. Routines in a school and in the classroom provide the environment for learning to take place. The paper is…

  15. Effective Classroom Management Techniques for Secondary Schools

    African Journals Online (AJOL)

    Results obtained revealed the effective classroom management techniques included among others constant engagement of students in activities, use of innovative instructional strategies by teachers, teachers acting as models, monitoring, effective communication, stimulating classroom environment and regular use of ...

  16. The Three Fs of Classroom Management

    Science.gov (United States)

    Daniels, Mark L.

    2009-01-01

    This article describes a cohesive theory of classroom management, developed by the author. This "three Fs" theory, predicated upon extant empiricism and scholarship vis-a-vis classroom management, was devised and implemented over several semesters within a field-based course at the University of Texas at Austin for preservice mathematics majors…

  17. Classroom Management: Beginning Teachers' Perceptions of Preparedness

    Science.gov (United States)

    Woods, Sean A.

    2015-01-01

    Classroom management has been the focal point of many different studies and research projects. Unfortunately, it has also been cited as one of the top three reasons teachers leave the field of education not only today, but for the last 40 years (Berry, 2010). There is a need for an understanding of the implications of past classroom management…

  18. The Caterpillar Game: A Classroom Management System

    Science.gov (United States)

    Floress, Margaret T.; Rock, Angela L.; Hailemariam, Assegedech

    2017-01-01

    A single-case experimental design was used to evaluate the effects of the Caterpillar Game, a classroom management system, on disruptive behavior in a general education first grade classroom. A multiple baseline design across settings was used to evaluate changes in student disruptive behavior and teacher praise. When the Caterpillar Game was…

  19. Comprehending Elementary School Teachers' Classroom Management Approaches

    Science.gov (United States)

    Sahin, Ali E.

    2015-01-01

    This study intends to determine elementary school teachers' degree of classroom control, which constitutes the consistency in their classroom management and discipline-related behaviour. The major research question was as follows: Is the control approach adopted by teachers related to certain variables (gender, age, subject area, experience)? The…

  20. Classroom Management and Students' Self-Esteem: Creating Positive Classrooms

    Science.gov (United States)

    Demirdag, Seyithan

    2015-01-01

    Middle school students experience substantial changes in their emotion and cognition while they grow. They have mixed feelings, which may negatively affect their motivation, self-esteem, and academic success due to different classroom management strategies of their teachers. There is available research about motivation of middle school students…

  1. Lessons about Motivation and Classroom Management.

    Science.gov (United States)

    Longway, Tanin; Cockman, Nelda R.

    2002-01-01

    Presents a question and answer format addressing what to do with a student who in the beginning of the fourth quarter has no chance of passing. Discusses some effective strategies for classroom management that have worked for experienced teachers. (SG)

  2. Mistake management in a foreign language classroom

    OpenAIRE

    Volkova, Ekaterina

    2012-01-01

    The aim of the thesis is to design general recomendations on mistake management in a foreign language classroom which would meet both teachers' and learners' requirements and methods of mistake management in a foreign language classroom which would contribute to development of learners' communicative competence. The following methods were used in the research: analysis of literature on pedagogy, psychology and methodology of foreign language teaching, interview, questionnaire and observation....

  3. Group Work Management in the Classroom

    Science.gov (United States)

    Forslund Frykedal, Karin; Hammar Chiriac, Eva

    2014-01-01

    This study aims to provide a better understanding of teachers' managing roles when using group work in the classroom. Building on Granström's 2 concepts of leadership and teachership, a more specific aim is to investigate teachers' managing roles when using group work and how teachers' presumptions affect the way in which they manage the…

  4. [Management of the dry and transition periods of dairy cattle in free stall housing systems in Lower Saxony. Part 1: Farm management. Teil 1: Betriebsmanagement].

    Science.gov (United States)

    Oetting-Neumann, Pamela; Hoedemaker, Martina

    2017-10-17

    Describing husbandry and management of dairy cows during the dry and transition periods on farms of different sizes in Lower Saxony, Germany. A total of 51 dairy farms were visited and asked via questionnaire about the husbandry and management in the following categories: general operating data, stable and husbandry of milking cows, dry cows, transition cows and the youngstock, pasture management, feeding, health data and prophylactic treatments. In addition, during a farm inspection, data on cow comfort were collected. German Holstein was the predominant breed on the dairy farms. Most cattle were kept in three-rowed free-stall housing systems (74%) with straw bedding (47%) without division in productivity groups (59%). The dry cows were most frequently separated in two groups (68%) in free-stall housing systems (68%). The heifers were similarly mainly kept in free-stall housing systems (67%) and were mostly separated according to their reproductive status (74%). On 29% of the farms, pasture grazing was not practiced at any time. On 80% of the farms, cows were fed a mixed ration with computerized concentrate supplementation and on 68% of the farms biphasic dry cow diets were used. The most frequently stated health problems were of the limb and claw (61%). Prophylaxis of ketosis was practiced on 21% of the farms and milk-fever prophylaxis on 12% of the farms, both for each individual cow around calving. Husbandry and management on farms differ widely and are still in need of optimization with respect to barn concepts, implementation of production groups and feeding, as well as veterinary consultation with respect to health problems and prophylactic measures.

  5. Classroom Management Training, Teaching Experience and Gender: Do These Variables Impact Teachers' Attitudes and Beliefs toward Classroom Management Style?

    Science.gov (United States)

    Martin, Nancy K.; Yin, Zenong; Mayall, Hayley

    2006-01-01

    This study represents a continuation of research efforts to further refine the Attitudes and Beliefs on Classroom Control (ABCC) Inventory. The purposes of this study were to investigate the: (1) impact of classroom management training on classroom management style; (2) differences in attitudes toward classroom management between novice and…

  6. A Review of Classroom Management Studies of Teachers’ Teaching and Students’ Learning about Classroom Rules

    OpenAIRE

    笹屋, 孝允

    2016-01-01

    This paper reviewed classroom management studies of teachers ’ teaching and students ’ learning about classroom rules since 1990s. Teachers decide classroom rules and teach them to students in class in the beginning time of the school year. Classroom rules divide students into students in primary adjustment and students in secondary adjustment. Misbehavior of Students in secondary adjustment provides opportunities to learn classroom rules, to negotiate modification of classroom rules with a t...

  7. Nonverbal Cues: The Key to Classroom Management.

    Science.gov (United States)

    Petrie, Garth; Lindauer, Patricia; Bennett, Brenda; Gibson, Sherri

    1998-01-01

    Principals should familiarize teachers with the benefits of nonverbal procedures for classroom management and discipline enforcement. A behavior-management checklist of nonverbal techniques (eye contact, touching, smiling, and frowning) can be used in a series of short visits. At least 75% of control techniques should be nonverbal. Relying on…

  8. Assertive Classroom Management Strategies and Students' Performance: The Case of EFL Classroom

    Science.gov (United States)

    Aliakbari, Mohammad; Bozorgmanesh, Bafrin

    2015-01-01

    Ample research findings support the effective role that classroom management strategies play in enhancing students' learning. Drawing upon Iranian high school teachers' classroom management strategies, this article is intended to examine the extent to which these teachers follow assertive classroom management strategies and if these strategies…

  9. Profiles of classroom behavior in high schools: associations with teacher behavior management strategies and classroom composition.

    Science.gov (United States)

    Pas, Elise T; Cash, Anne H; O'Brennan, Lindsey; Debnam, Katrina J; Bradshaw, Catherine P

    2015-04-01

    Although there has been considerable attention to the issue of classroom management and processes in educational reform models, there has been relatively limited research on these factors in high schools. The current study utilized observational data from 1262 classrooms in 52 high schools to examine teacher classroom management strategies and ratings of student compliance, engagement, and social disruption. Latent profile analysis (LPA) was conducted to examine specific patterns of classroom-wide student behavior in relation to teachers' use of classroom management strategies and classroom composition. The LPA revealed three distinct classroom behavioral profiles where students consistently met behavioral expectations (71%), inconsistently met expectations (23%), and were noncompliant (6%). Analyses indicated a functional association between patterns of student behavior and teachers' classroom management. In classrooms where students consistently met expectations, teachers provided more opportunities to respond and less disapproval and reactive behavioral management. Classrooms with noncompliant students had teachers who used the most disapproval and reactive behavior management. In addition, classrooms characterized as consistent had fewer males and more White students than classrooms characterized by inconsistent and noncompliant behaviors. These findings highlight the link between student patterns of behavior and teacher classroom management and have important implications for screening and professional development. Copyright © 2014 Society for the Study of School Psychology. Published by Elsevier Ltd. All rights reserved.

  10. Dimensions of Person-Centered Classroom Management

    Science.gov (United States)

    Freiberg, H. Jerome; Lamb, Stacey M.

    2009-01-01

    Public opinion trends over the last five decades show that lack of discipline continues to be one of America's top public educational concerns. This trend suggests that alternatives to the traditional model are urgently needed. In this traditional model of classroom management, based on behaviorism and still common in some areas, discipline is…

  11. 282 Effective Classroom Management Techniques for Secondary ...

    African Journals Online (AJOL)

    FIRST LADY

    2011-01-18

    Jan 18, 2011 ... Schools. (Pp. 282-291). Asiyai, Romina Ifeoma - Department of Educational Administration and. Policy Studies, Delta State University, Abraka, Delta State, Nigeria. E-mail: asiyairomina@ yahoo.com. Tel: + 2347042281823. Abstract. The purpose of this study was to identify effective classroom management.

  12. Embracing Ubuntu in managing effective classrooms | Maphalala ...

    African Journals Online (AJOL)

    Journal Home > Vol 15, No 4 (2017) > ... Ubuntu is founded on three pillars, namely, interpersonal values, intrapersonal values and environmental values. ... the infusion of an African perspective into classroom management which currently considers mainly Western principles in creating a conducive learning environment.

  13. Training Our Future Teachers: Classroom Management. Revised

    Science.gov (United States)

    Greenberg, Julie; Putman, Hannah; Walsh, Kate

    2014-01-01

    This report examines traditional teacher preparation in classroom management, which is a struggle for many teachers, especially new ones. 122 teacher preparation programs--both elementary and secondary, graduate and undergraduate--were examined to review the full breadth of the professional sequence. The following conclusions are made as a result…

  14. Effective Classroom-Management & Positive Teaching

    Science.gov (United States)

    Sieberer-Nagler, Katharina

    2016-01-01

    This article offers practical information for primary teachers to become more knowledgable, skilled and effective in their work. Aspects of positive teaching and learning are explored. Innovative methods for transforming common classroom management struggles into opportunities for positive change and for changing negative behaviors into positive…

  15. 282 Effective Classroom Management Techniques for Secondary ...

    African Journals Online (AJOL)

    FIRST LADY

    2011-01-18

    Jan 18, 2011 ... Abstract. The purpose of this study was to identify effective classroom management techniques for secondary schools teachers. Two research questions were answered using mean while two hypotheses were formulated and tested using t-test and one way analysis of variance. at 0.05 level of significance.

  16. Teachers' classroom management variables and students' academic ...

    African Journals Online (AJOL)

    Teachers' classroom management variables and students' academic achievement in French in Cross River State, Nigeria. JU Emeh, CA Agbor. Abstract. No Abstract. Global Journal of Humanities Vol. 4(1&2) 2005: 25-27. Full Text: EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD ...

  17. Coin Counter: Gamification for Classroom Management

    Science.gov (United States)

    Carlson, John; Harris, Ranida; Harris, Ken

    2017-01-01

    In recent years, gamification has been utilized in a number of different contexts, including educational applications. This paper describes a unique application of coin-based gamification classroom management system in undergraduate programming classes. The coin-based gamification allowed students to earn and spend coins as a form of classroom…

  18. Rethinking Classroom Management: A New Perspective, a New Horizon

    Science.gov (United States)

    Toprakci, Erdal

    2012-01-01

    The purpose of this study is to suggest a new perspective and a new horizon by analyzing the concept of classroom management in the literature of traditional classroom management from a scientific and dictionary view. It may be said that there are serious problems regarding the settlement of the meaning of "classroom management" in the educational…

  19. Bringing Reality to Classroom Management in Teacher Education

    Science.gov (United States)

    Eisenman, Gordon; Edwards, Susan; Cushman, Carey Anne

    2015-01-01

    Learning how to manage a classroom effectively is a difficult task for preservice teachers. This is compounded by the lack of attention that classroom management receives in many teacher preparation programs and in the field of education in general. This article offers a rationale for the lack of attention to classroom management in teacher…

  20. Teacher Education for Classroom Management in Israel: Structures and Orientations

    Science.gov (United States)

    Ben-Peretz, Miriam; Eilam, Billie; Landler-Pardo, Gabi

    2011-01-01

    In our paper, we examine how classroom management is taught in teacher education in Israel. Three questions are addressed: (1) What is the structure of programs for classroom management (site, timing, duration, number of courses, mandatory/optional)? (2) How is classroom management conceived (technical/pedagogical, individual/systemic)? (3) Does…

  1. Social-Emotional Learning Is Essential to Classroom Management

    Science.gov (United States)

    Jones, Stephanie M.; Bailey, Rebecca; Jacob, Robin

    2014-01-01

    Research tells us that children's social-emotional development can propel learning. A new program, SECURe, embeds that research into classroom management strategies that improve teaching and learning. Across all classrooms and grade levels, four principles of effective management are constant: Effective classroom management is based in…

  2. A Case Study of Classroom Management Practices and the Influence on Classroom Disruptions

    Science.gov (United States)

    Rusk, Robert Brian

    2016-01-01

    This qualitative case study explored how the classroom management practices of sampled teachers in a private school in central Oregon influenced classroom disruptions. Through the study, the researcher was able to provide insight on the differences in specific classroom management processes between teachers who had a high number of Positive…

  3. Classroom Management in Foreign Language Education: An Exploratory Review

    Directory of Open Access Journals (Sweden)

    Diego Fernando Macías

    2018-01-01

    Full Text Available This review examines studies in the area of classroom management in foreign language education. It is organized into three large areas: The first area focuses on the distinctive characteristics of foreign language instruction that are more likely to impact classroom management in foreign language classes. The second area provides a description of classroom management issues that foreign language teachers usually encounter in their practice; and the third area centers on the different alternatives to reduce the negative impact of classroom management on foreign language classes. Conclusions suggest a need for more research particularly on the relationship between classroom management and aspects such as target language use and teaching methods.

  4. Systemize Classroom Management to Enhance Teaching and Learning

    Science.gov (United States)

    Delman, Douglas J.

    2011-01-01

    Good classroom management is one of the most important goals teachers strive to establish from the first day of class. The rules, procedures, activities, and behaviors set the classroom tone throughout the school year. By revising, updating, and systemizing classroom management activities, teachers can eliminate many problems created by students…

  5. Development of Classroom Management Scale for Science Teachers

    Science.gov (United States)

    Temli-Durmus, Yeliz

    2016-01-01

    Students cannot learn in chaotic, badly managed classrooms. In the first years of teaching experiences, teachers revealed that novice teachers came to recognize the importance of discipline skills and classroom management for effective instruction. The purpose of the study was (i) to develop Science teachers' views towards classroom management…

  6. The Correlation between Level of Classroom Teachers’ Self-Efficacy Beliefs and Classroom Management Ability Perceptions

    Directory of Open Access Journals (Sweden)

    Emine BABAOĞLAN

    2010-04-01

    Full Text Available This research aims to determine the level of classroom teachers’ self-efficacy beliefs and classroom management ability perceptions and the correlation between these beliefs and perceptions. The study group were 401 classroom teachers who were working as a classroom teacher in public elementary schools, in 2009, in Burdur, Ağlasun, Kemer, Gölhisar, in Türkiye. The data was collected with the “Teacher Self-Efficacy Belief Scale” and “Classroom Management Ability Scale”. Numerous statistical techniques such as means and standard deviations and correlation were used for analyzing the data. This research findings show that the level of self-efficacy beliefs of classroom teachers are at “quite high” level. In addition to the level of classroom teachers’ "plan program activities and physical layout" dimension of the classroom management ability perceptions were "good" level, "teacher-student relationship regulation and time management" and "classroom interaction and behavior regulation" dimensions were "very good" level. Finally, it is seen that there is a meaningful and middle level correlation between the level of classroom teachers' self-efficacy beliefs and classroom management ability perceptions in all dimensions.

  7. The Development of Novice Teachers' Culturally Responsive Classroom Management Practice

    Science.gov (United States)

    Patish, Yelena

    2016-01-01

    While extensive research has been conducted on classroom management little research exists on culturally responsive classroom management. The primary purpose of this qualitative study was to examine how four novice teachers developed their culturally responsive management practice (CRCM) to better meet the needs of their students. My analysis was…

  8. Classroom Management: A Selected Review of the Literature.

    Science.gov (United States)

    Vasa, Stanley F.

    Classroom management factors relating to group management of students and cooperation between the student and the teacher are discussed. The definition of classroom management is limited in this discussion to those managerial behaviors related to maintenance of on-task student behaviors and the reduction of off-task or disruptive behaviors.…

  9. Classroom Management and Teachers' Coping Strategies: Inside Classrooms in Australia, China and Israel

    Science.gov (United States)

    Romi, Shlomo; Lewis, Ramon; Roache, Joel

    2013-01-01

    This paper discusses the degree to which recently reported relationships between the classroom management techniques and coping styles of Australian teachers apply in two other national settings: China and Israel. Little is known about which teacher characteristics relate to their approach to classroom management, although researchers in Australia…

  10. Collaborative Classroom Management in a Co-Taught Primary School Classroom

    Science.gov (United States)

    Rytivaara, Anna

    2012-01-01

    The purpose of this study was to examine how teachers manage their classroom in co-taught lessons. The data were collected by observing and interviewing a pair of primary school teachers. The most important influence of collaboration on classroom management seemed to be the emotional support of another adult, and the opportunity to use different…

  11. Classroom Profiling Training: Increasing Preservice Teachers' Confidence and Knowledge of Classroom Management Skills

    Science.gov (United States)

    Jackson, Cliff; Simoncini, Kym; Davidson, Mark

    2013-01-01

    Classroom management is a serious concern for beginning teachers including preservice teachers. The Queensland Department of Education, Training and Employment (DETE) has developed the Essential Skills for Classroom Management (ESCM), a system of positive and pro-active strategies for maintaining supportive learning environments. In addition, the…

  12. Enhancing Classroom Management Using the Classroom Check-up Consultation Model with In-Vivo Coaching and Goal Setting Components

    Science.gov (United States)

    Kleinert, Whitney L.; Silva, Meghan R.; Codding, Robin S.; Feinberg, Adam B.; St. James, Paula S.

    2017-01-01

    Classroom management is essential to promote learning in schools, and as such it is imperative that teachers receive adequate support to maximize their competence implementing effective classroom management strategies. One way to improve teachers' classroom managerial competence is through consultation. The Classroom Check-Up (CCU) is a structured…

  13. Classroom management, student-teacher relationships and quality in education

    DEFF Research Database (Denmark)

    Christensen, Mette Vedsgaard

    Knowledge about classroom management is crucial for both teachers’ and students’ well-being and educational success. Studies have indicated that teaching and learning cannot take place effectively in poorly managed classrooms (Jones & Jones, 2012; Marzano, Marzano & Pickering, 2003), and research...

  14. Persistent Classroom Management Training Needs of Experienced Teachers

    Science.gov (United States)

    Stough, Laura M.; Montague, Marcia L.; Landmark, Leena Jo; Williams-Diehm, Kendra

    2015-01-01

    Experienced special education teachers (n = 62) were surveyed on their professional preparation to become effective classroom managers. Despite having received extensive preservice training, over 83% of the sample reported being underprepared in classroom management and behavioral interventions. No statistically significant difference was found…

  15. Geography Teachers' Attitudes and Beliefs Regarding Classroom Management

    Science.gov (United States)

    Dikmenli, Yurdal; Çifçi, Taner

    2016-01-01

    This study scrutinizes geography teachers' attitude and belief levels regarding classroom management. As a matter of fact, classroom management is one of the prominent areas emphasized by all educators. Descriptive correlational survey model was used in the study. Study group includes 58 geography teachers working in Sivas province during the…

  16. The Changes in Experienced Teachers' Understanding towards Classroom Management

    Science.gov (United States)

    Ersozlu, Alpay; Cayci, Dilara

    2016-01-01

    The aim of this study is to examine the views of experienced teachers related to the changes in their understanding of classroom management in general terms until today. In this study according to the information given by teachers, it is expected to contribute to the discussions about the development of classroom management, which is a key to…

  17. The Classroom Manager: Procedures and Practices to Improve Instruction

    Science.gov (United States)

    Houff, Suzanne G.

    2009-01-01

    Using William Glasser's five basic needs as a foundation, "The Classroom Manager" provides a theoretical base to guide readers in the understanding and development of an effective classroom management program. The topics of survival, belonging and love, power, fun, and freedom are explored through definitions, practical recommendations and case…

  18. Classroom Management in Foreign Language Education: An Exploratory Review

    Science.gov (United States)

    Macías, Diego Fernando

    2018-01-01

    This review examines studies in the area of classroom management in foreign language education. It is organized into three large areas: The first area focuses on the distinctive characteristics of foreign language instruction that are more likely to impact classroom management in foreign language classes. The second area provides a description of…

  19. Preparing Preservice Teachers for Inclusive Classrooms: Does Completing Coursework on Managing Challenging Behaviours Increase Their Classroom Management Sense of Efficacy?

    Science.gov (United States)

    O'Neill, Sue C.

    2015-01-01

    Preservice teacher education courses provide an opportunity for the development of knowledge, skills, and confidence in classroom and behaviour management. This study reports the change in classroom management sense of efficacy (CMSE) of a small cohort of Australian preservice primary teachers at 4 time points (precoursework, preprofessional…

  20. Classroom Composition, Classroom Management, and the Relationship between Student Attributes and Grades

    Science.gov (United States)

    Hochweber, Jan; Hosenfeld, Ingmar; Klieme, Eckhard

    2014-01-01

    The present study examined the extent to which the relationships between student self-reported math grades and different types of student variables (standardized math test scores, interest and effort in math, parental education) are predicted by classroom composition and teachers' classroom management. Based on a representative sample of 31,038…

  1. Classroom as a social community and its management

    OpenAIRE

    Kovač, Nina

    2016-01-01

    The aim of this master′s thesis is to present classroom as a social community, focusing on teacher’s work. In the theoretical part, the thesis describes the history of schooling in Slovenian geographical area and defines concepts such as group, teacher, student and classroom. The most typical and commonly used classroom management styles are also presented. Data for the qualitative research are obtained from three class teachers who voluntarily participate in the research. Each teacher...

  2. Classroom Management Skills of The Language Teachers

    Directory of Open Access Journals (Sweden)

    Arif Sarıçoban

    2005-04-01

    Full Text Available Teachers or educators, most of the time, concentrate on the theoretical aspects oflanguage teaching and study them as much as possible. However, in practice, we start thinkingthat we will have to keep a number of people together in the same place. These are often thepeople who come from many different backgrounds and whose expectations differ. In thiscase, it becomes more and more difficult to appeal to every individual in class. Therefore, asteachers we should initially be trained on how to manage our classrooms and how to providethe necessary environment to put into practice the things we have learned to teach a language.Obviously, we need management skills as well as the language teaching skill. Actually, it isnot as difficult as many people think. As teachers if we fulfill our duties properly, a wellmanagedclass will ensue. In this study, therefore, the definition of class management isregarded roughly “to keep people from different environments directed to one single goal”.When this is accomplished, we are unlikely to live discipline problems.

  3. Assessing the Flipped Classroom in Operations Management: A Pilot Study

    Science.gov (United States)

    Prashar, Anupama

    2015-01-01

    The author delved into the results of a flipped classroom pilot conducted for an operations management course module. It assessed students' perception of a flipped learning environment after making them experience it in real time. The classroom environment was construed using a case research approach and students' perceptions were studied using…

  4. Toward a Conception of Culturally Responsive Classroom Management

    Science.gov (United States)

    Weinstein, Carol S.; Tomlinson-Clarke, Saundra; Curran, Mary

    2004-01-01

    Given the increasing diversity of our classrooms, a lack of multicultural competence can exacerbate the difficulties that novice teachers have with classroom management. Definitions and expectations of appropriate behavior are culturally influenced, and conflicts are likely to occur when teachers and students come from different cultural…

  5. How an Active Learning Classroom Transformed IT Executive Management

    Science.gov (United States)

    Connolly, Amy; Lampe, Michael

    2016-01-01

    This article describes how our university built a unique classroom environment specifically for active learning. This classroom changed students' experience in the undergraduate executive information technology (IT) management class. Every college graduate should learn to think critically, solve problems, and communicate solutions, but 90% of…

  6. Teaching the Social Curriculum: Classroom Management as Behavioral Instruction

    Science.gov (United States)

    Skiba, Russ; Ormiston, Heather; Martinez, Sylvia; Cummings, Jack

    2016-01-01

    Psychological science has identified positive classroom management and climate building strategies as a key element in developing and maintaining effective learning environments. In this article, we review the literature that has identified effective strategies that build classroom climates to maximize student learning and minimize disruption. In…

  7. Working the Crowd: Behavior Management through Strategic Classroom Arrangement

    Science.gov (United States)

    Martin, Jeff

    2015-01-01

    Every day in K-12 classrooms across the country, teachers are struggling to keep their students focused and on task during instructional time. There are hundreds of theories floating around about how to manage a classroom effectively, but nothing is as simple or as effective in engaging students as the physical presence of the teacher (Brophy,…

  8. Compressible dynamic stall vorticity flux control using a dynamic ...

    Indian Academy of Sciences (India)

    management of its unsteady vorticity using a variable droop leading edge (VDLE) airfoil. Through ... the pressure gradient term for the dynamic stall conditions encountered by a helicopter-rotor retreating blade. Thus ... This paper discusses control of compressible dynamic stall using the novel idea of variable droop leading ...

  9. Teacher Classroom Management Ratings at Concept Charter Schools

    Science.gov (United States)

    Senlik, Yasar

    2013-01-01

    The purpose of this study is to identify the factors that impact the classroom management rating score of teachers at Concept Schools managed charter schools. Concept Schools, a non-profit management and consulting organization that manages charter schools in the Midwest, has adapted Charlotte Danielson's rubrics for "Enhancing Professional…

  10. Evaluation of Teachers' Opinions About Effective Classroom Management Practices

    Directory of Open Access Journals (Sweden)

    Soner DOĞAN

    2014-12-01

    Full Text Available The aim of this study is to evaluate teacher behaviour in creating an effective classroom management process with regard to the views of the teachers working in primary and secondary schools. This is a qualitative study in which the case study design was used. The related literature was scanned and 9 open-ended questions were prepared. These questions that based on maximum variation sampling method were posed to 18 teachers. The data were collected by interview forms and were examined by descriptive and content analysis methods. According to the findings obtained, teachers have stated that pre-determination of classroom rules, asking for students' advices, lecturing in a planned manner, planned teaching, various methods, communication skills, time management, being a model and transitions between activities affect the process of classroom management positively; while punishment affects it in a partly positive way and the differences among the discipline perceptions affect the classroom management negatively

  11. Scholar Dollars: Their Use in Classroom Management.

    Science.gov (United States)

    Deery, Ruth

    Suggestions and background information to help teachers use classroom currency to influence students' behavior and academic efforts are provided. There are five parts to the publication. Part 1 discusses the many uses of classroom currency in teaching economics content, for motivation, and in discipline. For example, if teachers find that…

  12. Teacher Education Perceptions of a Proposed Mobile Classroom Manager

    OpenAIRE

    Dave E. Marcial

    2015-01-01

    In a knowledge-driven enterprise, mobile learning introduces new ways for students to learn and educators to teach. This paper investigates the acceptability of a mobile classroom manager among teacher educators in Central Visayas, Philippines. Specifically, this paper presents findings from an empirical investigation on the level of perceived usefulness and ease of use of the mobile classroom manager. A total of 383 responses from 76 private and public higher education institu...

  13. The Effects of Clinical Experiences on the Understanding of Classroom Management Techniques

    Science.gov (United States)

    Cushman, Carey Anne Aycock; Kempy, Andrew

    2012-01-01

    For teacher educators, classroom management education is one of the least researched aspects of the profession. The purpose of this study was to determine if classroom management was most effectively learned through textbook analysis coupled with classroom discussion, or the experience of observing and practicing classroom management in the…

  14. Teaching as a cultural practice: managing diverse classrooms

    Directory of Open Access Journals (Sweden)

    Rosa María RODRÍGUEZ IZQUIERDO

    2011-09-01

    Full Text Available Teaching is a cultural process. Actions that take place in this process are influenced by some cultural assumptions which shape pre-defined objectives and affect content, educational treatment, assessments, and relationships among participants. It is, therefore, of utmost importance not only to make explicit the cultural reality of education, but also to think critically about it. In this paper, we focus on the issue of teaching and learning in the context of cultural diversity from a socio-cultural and socio-political theoretical framework. The keywords «classroom management» it generates over 6.5 million hits in google.com. However, when we type «managing diverse classrooms», there are only 200,000 hits. This divergence indicates that classroom management is a widely explored topic, while work about how to manage a cultural diverse classroom is still limited. The aim of this paper is to provide a framework for teachers to use and improve their cultural knowledge to manage classrooms more effectively. This article argues that growth in cultural awareness of the teaching process improves the quality of teaching and, therefore, students’ learning.

  15. The Relationship between Classroom Management and Graduate Students' Academic Procrastination

    Directory of Open Access Journals (Sweden)

    naser nastiezaie

    2017-06-01

    Full Text Available AWT IMAGE Background and Objective: Academic procrastination is one of the common phenomena among students that can affect classroom management in different ways.. This study aimed to investigate the relationship between classroom management and academic procrastination in graduate students at University of Sistan and Baluchistan. Materials and Methods: This study is descriptive-correlational (regression. The study population was all graduate students of the University of Sistan and Baluchestan in the first half of the academic year 2015-2016. By using stratified convenience sampling method, 328 students were selected and studied through applying two questionnaires of class management that were made by researchers and Savari’s academic procrastination questionnaire. To analyze the data, Pearson correlation coefficient, simultaneous multiple regression analysis, and SPSS21 software were used. Results: Mean scores were as follows: designing and organizing (3.49±0.452, leadership (3.58±0.422, monitoring and control (3.42±0.48, evaluation (2.92±0.708, classroom management (3.35±0.346, academic procrastination (2.05±1.169. Correlation coefficients of designing and organizing, leadership, monitoring and control, evaluation, classroom management with academic procrastination were -0.3,-0.391,-0.414,-0.544 and -0.637 (p<0.01 respectively. Based on the results of regression analysis, class management components showed 41.5 of the variance of academic procrastination (p<0.01. Conclusion The faculty can effectively and efficiently manage their classroom by improving designing and organizing, leadership, monitoring and control, and evaluation skills. This may result in reduction of students' academic procrastination. Keywords: Classroom management, Designing and organizing, Leadership, Monitoring and control, Evaluation, Academic procrastination.

  16. Classroom Management: A Gallon in a Pint Pot?

    Science.gov (United States)

    Bell, Roger T.

    1984-01-01

    Suggests a more literal definition of "classroom management" in reference to the role of the teacher. By focusing on the three overlapping and interacting sets of responsibilities carried by the manager--to the task, to the group, and to the individual--this approach attempts to put into perspective the multiple functions played by the teacher.…

  17. Five Approaches to Avoid When Managing the Middle School Classroom

    Science.gov (United States)

    Englehart, Joshua M.

    2013-01-01

    Too often, teachers encountering difficulties with classroom management focus only on the students rather than critically examining the influence of their own approaches on student behavior. Given the particular challenges that middle school students present, certain practices and expectations exacerbate management issues, and a lack of awareness…

  18. Professional Vision of Classroom Management and Learning Support in Science Classrooms--Does Professional Vision Differ across General and Content-Specific Classroom Interactions?

    Science.gov (United States)

    Steffensky, Mirjam; Gold, Bernadette; Holdynski, Manfred; Möller, Kornelia

    2015-01-01

    The present study investigates the internal structure of professional vision of in-service teachers and student teachers with respect to classroom management and learning support in primary science lessons. Classroom management (including monitoring, managing momentum, and rules and routines) and learning support (including cognitive activation…

  19. Modification of Behavior: Application in Classroom Management.

    Science.gov (United States)

    Ille, Sister Janiece; Bezzi, D. R.

    The emphasis of this research report was on modification of classroom behavior. After a brief introduction, the two main learning theories of Gestalt-field psychology and stimulus-response association were investigated. The importance of the individual in modifying his own behavior was stressed in Gestalt-field psychology. The importance of…

  20. Opportunities and Challenges in Training Elementary School Teachers in Classroom Management: Initial Results from Classroom Management in Action, an Online Professional Development Program

    Science.gov (United States)

    Marquez, Brion; Vincent, Claudia; Marquez, Jessie; Pennefather, Jordan; Smolkowski, Keith; Sprague, Jeffrey

    2016-01-01

    Classroom management remains a challenge for many teachers. The approach and delivery of professional development (PD) in classroom management may determine how well teachers are able to apply evidence-based approaches in their classrooms. We use existing literature to identify the key features that make in-service PD effective and present them as…

  1. Student Science Teachers' Accounts of a Well-Remembered Event about Classroom Management.

    Science.gov (United States)

    Zuckerman, June Trop

    2000-01-01

    Discusses how 36 student science teachers described and responded to one of their own classroom management problems. Based on student teachers' written accounts of a well-remembered event about classroom management. (SAH)

  2. THE USE OF GROUP WORK STRATEGY IN CLASSROOM MANAGEMENT OF LANGUAGE HOUSE TEFL IN PRAGUE

    OpenAIRE

    Ernidawati Ernidawati

    2017-01-01

    This paper is aimed to analyze the use of group work strategy to manage teaching learning English in the classroom. It is a case study of groupwork strategy in classroom management of language house TEFL in Prague. The subject of this study is the teacher and the students of language house TEFL in Prague. The object of this study is group work strategy in classroom management. Classroom management strategies focus on implementing strategies on how students should behave in the ...

  3. Simulating Variation in Order to Learn Classroom Management

    Science.gov (United States)

    Ragnemalm, Eva L.; Samuelsson, Marcus

    2016-01-01

    Classroom management is an important part of learning to be a teacher. The variation theory of learning provides the insight that it is important to vary the critical aspects of any task or subject that is to be learned. Simulation technology is useful in order to provide a controlled environment for that variation, and text as a medium gives the…

  4. An Evaluation of CHAMPS: A Classroom Management Program

    Science.gov (United States)

    Minnear, Holly J.

    2015-01-01

    This dissertation was designed to examine the impact of Conversation, Help, Activity, Movement, Participation, Success (CHAMPS), a classroom management program in elementary schools in a district in North Carolina. The participants included principals and teachers who attended a 2-day training course and implemented the CHAMPS program at their…

  5. Authoritative Classroom Management: How Control and Nurturance Work Together

    Science.gov (United States)

    Walker, Joan M. T.

    2009-01-01

    Despite broad recognition that teaching excellence requires meeting students' intellectual and social needs, teachers struggle to manage--and learning theory struggles to explain--the interplay between the academic and social dimensions of classroom life. Drawing from research on parenting and child development, the author offers parenting style…

  6. Preschool Teachers' Views about Classroom Management Models

    Science.gov (United States)

    Sahin-Sak, Ikbal Tuba; Sak, Ramazan; Tezel-Sahin, Fatma

    2018-01-01

    This survey-based quantitative study investigates 310 Turkish preschool teachers' views about classroom management, using the following six models of disciplinary strategy: behavioral change theory, Dreikurs' social discipline model, Canter's assertive discipline model, the Glasser model of discipline, Kounin's model, and Gordon's teacher…

  7. Classcraft: From Gamification to Ludicization of Classroom Management

    Science.gov (United States)

    Sanchez, Eric; Young, Shawn; Jouneau-Sion, Caroline

    2017-01-01

    In this article, we discuss the concept of gamification, based on a literature review and preliminary feedback from teachers using "Classcraft," a role-playing game supported by a digital platform and a mobile application that were developed to answer high school teachers' classroom management needs. Our results come from two experiments…

  8. Transformational Leadership: Practicing What We Teach in the Management Classroom

    Science.gov (United States)

    Pounder, James S.

    2008-01-01

    In a Hong Kong study, the author examined the effect on undergraduate business students of university business school instructors' exhibiting a transformational leadership style in the classroom. Transformational leadership is one of the central concepts in management, and research has indicated that a positive association exists between this…

  9. Enhancing Higher Education Student Attendance through Classroom Management

    Science.gov (United States)

    Al-Shammari, Zaid N.

    2016-01-01

    The findings of three consecutive studies about effective classroom management techniques designed to enhance higher education student attendance and the resulting correlation between student attendance and student achievement are reported here. The consecutive studies included a pilot study, culminating study, and replication study. The…

  10. The Case for Individualizing Behavior Management Approaches in Inclusive Classrooms

    Science.gov (United States)

    Grossman, Herbert

    2005-01-01

    In today's heterogeneous classrooms, one-method-fits-all-students behavior management approaches are ineffective and often harmful. To succeed with all of their students, teachers should determine whether students have emotional disorders, conduct/behavior disorders, robust male-typical behavior patterns, culturally influenced behavior, learning…

  11. Directed Consultation, the SEALS Model, and Teachers' Classroom Management

    Science.gov (United States)

    Motoca, Luci M.; Farmer, Thomas W.; Hamm, Jill V.; Byun, Soo-yong; Lee, David L.; Brooks, Debbie S.; Rucker, Nkecha; Moohr, Michele M.

    2014-01-01

    Directed consultation is presented as a professional development framework to guide and support teachers in the implementation of evidence-based interventions that involve contextual and process-oriented approaches designed to be incorporated into daily classroom management. This approach consists of four components: pre-intervention observations…

  12. Exploring the Foundations of Middle School Classroom Management.

    Science.gov (United States)

    Bucher, Katherine T.; Manning, M. Lee

    2002-01-01

    Examines the work of several theorists who laid the groundwork for contemporary classroom management in an effort to provide educators with effective ways to encourage and teach appropriate student behavior. Notes that theoretical contributions of B.F. Skinner, Fritz Redl, William Wattenberg, William Glasser, and Thomas Gordon all have relevance…

  13. A Model for Online Support in Classroom Management: Perceptions of Beginning Teachers

    Science.gov (United States)

    Baker, Credence; Gentry, James; Larmer, William

    2016-01-01

    Classroom management is a challenge for beginning teachers. To address this challenge, a model to provide support for beginning teachers was developed, consisting of a one-day workshop on classroom management, followed with online support extending over eight weeks. Specific classroom management strategies included (a) developing a foundation…

  14. Moving towards Raising Consciousness: An Inquiry into How Preservice Teachers Envision Classroom Management

    Science.gov (United States)

    LaLonde, Courtney C.

    2017-01-01

    Effective classroom management is critical in the creation of learning environments that foster academic success for all students. Preservice teachers must develop an awareness and understanding of all aspects of classroom management and their relation to the two main classroom management approaches: the discipline based approach and the…

  15. Classroom Management through the Eyes of Elementary Teachers in Turkey: A Phenomenological Study

    Science.gov (United States)

    Akin, Sibel; Yildirim, Ali; Goodwin, A. Lin

    2016-01-01

    This study aims to explore Turkish elementary teachers' (1) perceptions of classroom management, (2) classroom management problems they experience, (3) factors causing these problems, and (4) their classroom management practices. The study employed phenomenological research design in the qualitative tradition. The participants included 15…

  16. 14 CFR 25.103 - Stall speed.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Stall speed. 25.103 Section 25.103... STANDARDS: TRANSPORT CATEGORY AIRPLANES Flight Performance § 25.103 Stall speed. (a) The reference stall speed, VSR, is a calibrated airspeed defined by the applicant. VSR may not be less than a 1-g stall...

  17. Teacher Education Perceptions of a Proposed Mobile Classroom Manager

    Directory of Open Access Journals (Sweden)

    Dave E. Marcial

    2015-08-01

    Full Text Available In a knowledge-driven enterprise, mobile learning introduces new ways for students to learn and educators to teach. This paper investigates the acceptability of a mobile classroom manager among teacher educators in Central Visayas, Philippines. Specifically, this paper presents findings from an empirical investigation on the level of perceived usefulness and ease of use of the mobile classroom manager. A total of 383 responses from 76 private and public higher education institutions were included in the analysis. The instrument used in data gathering was a survey questionnaire adopted from the first Technology Acceptance Model by Davis (1989. The study reveals that a mobile class record application is highly useful as perceived by the respondents (x̄ = 5.48. A mobile class record application is also perceived to be good in terms of its ease of use (x̄ = 5.32. The result implies that the respondents will assuredly accept and use the mobile tool in their classroom. It can be concluded that teacher educators will strongly adopt the proposed instructional tool and integrate it into their teaching and learning activities. It is highly recommended that the mobile classroom manager application will be developed in accordance with the teaching practices of the teacher educators.

  18. Teacher Professional Knowledge and Classroom Management: On the Relation of General Pedagogical Knowledge (GPK) and Classroom Management Expertise (CME)

    Science.gov (United States)

    König, Johannes; Kramer, Charlotte

    2016-01-01

    Due to the need for measurement instruments that allow an investigation of teachers' situational cognition and thus go beyond the limited scope of classical paper-and-pencil-tests, we ask how a specific video-based measurement of teachers' classroom management expertise can provide additional information when compared with an established…

  19. Preventing Disruptive Behavior via Classroom Management: Validating the Color Wheel System in Kindergarten Classrooms.

    Science.gov (United States)

    Watson, Tiffany L; Skinner, Christopher H; Skinner, Amy L; Cazzell, Samantha; Aspiranti, Kathleen B; Moore, Tara; Coleman, MariBeth

    2016-07-01

    Evidence suggests that installing a classroom management system known as the Color Wheel reduced inappropriate behaviors and increased on-task behavior in second- and fourth-grade classrooms; however, no systematic studies of the Color Wheel had been disseminated targeting pre-school or kindergarten participants. To enhance our understanding of the Color Wheel System (CWS) as a prevention system, a multiple-baseline design was used to evaluate the effects of the Color Wheel on inappropriate vocalizations (IVs) in three general education kindergarten classrooms. Partial-interval time-sampling was used to record classwide IVs, which were operationally defined as any comment or vocal noise that was not solicited by the teacher. Time series graphs and effect size calculations suggest that the CWS caused immediate, large, and sustained decreases in IVs across the three classrooms. Teacher acceptability and interview data also supported the CWS. Implications related to prevention are discussed and directions for future research are provided. © The Author(s) 2016.

  20. Teacher Self-Efficacy and Classroom Management Styles in Jordanian Schools

    Science.gov (United States)

    Abu-Tineh, Abdullah M.; Khasawneh, Samar A.; Khalaileh, Huda A.

    2011-01-01

    Two main purposes guided this study. The first was to identify the degree to which Jordanian teachers practise classroom management styles in their classrooms and their level of teacher self-efficacy. The second purpose was to explore the relationships between classroom management styles and teacher self-efficacy. This study is quantitative in…

  1. Classroom Management Affects Literacy Development of Students with Emotional and Behavioral Disorders

    Science.gov (United States)

    Garwood, Justin D.; Vernon-Feagans, Lynne

    2017-01-01

    Many children with behavior problems perform poorly academically and can disrupt regular classroom instruction. Although good classroom management strategies can benefit children with behavior problems, it is not clear whether these students need consistently good classroom management across the early elementary school years to improve their…

  2. Teacher Classroom Management Practices: Effects on Disruptive or Aggressive Student Behavior

    Science.gov (United States)

    Oliver, Regina M.; Wehby, Joseph H.; Reschly, Daniel J.

    2011-01-01

    Despite the large research base grounded in behavioral theory for strategies to increase appropriate behavior and prevent or decrease inappropriate behavior in the classroom, a systematic review of multi-component universal classroom management research is necessary to establish the effects of teachers' universal classroom management approaches.…

  3. Student Perceptions regarding Vocational High School Teachers' Problem Solving Methods against Undesired Behaviors in Classroom Management

    Science.gov (United States)

    Gulcan, Murat Gurkan

    2010-01-01

    Teachers' classroom management approach varies depending on several factors such as the social, psychological, cultural and educational status of the student, classroom level, the physical conditions of the school, organization structure. There are different approaches in classroom management. These approaches are gathered under three headings in…

  4. According to Candidate Teachers Views Classroom Management Problems of Teachers in Traditional and Technology-Supported Classrooms

    Science.gov (United States)

    Tas, Said

    2017-01-01

    In this research, it is aimed to investigate classroom management problems of middle school 6th and 7th grade teachers in traditional and technology-supported classrooms and differences between them. For this purpose the opinions of the students in the 4th grade of Primary Education Department in Faculty of Education of Süleyman Demirel University…

  5. Motivational Interviewing for Effective Classroom Management: The Classroom Check-Up. Practical Intervention in the Schools Series

    Science.gov (United States)

    Reinke, Wendy M.; Herman, Keith C.; Sprick, Randy

    2011-01-01

    Highly accessible and user-friendly, this book focuses on helping K-12 teachers increase their use of classroom management strategies that work. It addresses motivational aspects of teacher consultation that are essential, yet often overlooked. The Classroom Check-Up is a step-by-step model for assessing teachers' organizational, instructional,…

  6. Novice and expert teacher's perspective on classroom teaching and management

    OpenAIRE

    Růžičková, Veronika

    2015-01-01

    The aim of this bachelor thesis is to analyse the differences between the novice and expert teacher's perspective on classroom teaching and management, such as lesson planning, students' motivation, dealing with indiscipline or teaching methods. Furthermore, the thesis analyses the way of how the novice teachers perceive their career starts and professional development in comparison to expert teachers. The theoretical part elaborates on various concepts and theories which are concerned with t...

  7. MANAGING DISRUPTIVE BEHAVIOR OF STUDENTS IN LANGUAGE CLASSROOM

    Directory of Open Access Journals (Sweden)

    Siti Khasinah

    2017-05-01

    Full Text Available This article describes students’ disruptive behaviors in language classroom that may greatly affect language teaching and learning process, especially in ESL or EFL classes. Teachers should know what disruptive behavior is to enable them to deal with problems occurred in their classroom or to take preventive actions to keep their students well-behaved during the class. This can reduce the occurrence of misbehavior of students in their classroom. To prevent disruption in the classroom, teachers should establish behavioral expectations in the first day of the semester and the expectations can be based on students attendance, arrivals and departures, class participation, full English speaking, and other appropriate conducts in the syllabus and discuss them at the outset of the term. The agreement is then assigned as a learning contract or a code of conducts with which bounds the whole class. Consequently, whenever students are misbehaved, teachers and other students will directly know and recognize that the behaviors are out of the code. There are factors reasoning students to behave badly, so teachers as trouble solvers have to find appropriate strategies that are effective in helping students keep the code. Otherwise, the disruptions will escalate quickly and the problems will increase in numbers rapidly and finally, teachers will have to work very hard to avoid teaching failure and “losing face” when they cannot manage the disruption as listed in the expectation.

  8. Classroom Management Styles and Personality Variables of Teachers and Education Majors: Similarities and Differences.

    Science.gov (United States)

    Smith, Douglas K.

    This study: (1) examined approaches of teacher education majors and experienced regular classroom teachers to classroom misbehavior; (2) compared the two groups on selected personality variables (locus of control, Machiavellianism, dogmatism, state-trait anxiety); and (3) examined the relationship of classroom management style to these personality…

  9. A Self-Regulatory Approach to Classroom Management: Empowering Students and Teachers

    Science.gov (United States)

    Alderman, M. Kay; MacDonald, Suzanne

    2015-01-01

    Development of motivation and self-regulated learning skills can take classroom management beyond the role of maintaining order in the classroom to empower students and teachers for lifetime learning. The authors describe self-regulated learning, student strategies, and the classroom structure that supports motivation and self-regulation.

  10. Cultivating Pre-Service Teachers' Classroom Management Skills through Teaching Practicum: A Reflective Practice

    Science.gov (United States)

    Ragawanti, Debora Tri

    2015-01-01

    Classroom management is commonly believed to be the key to the success of an instruction. Many student teachers, however, might find it very challenging to handle their classrooms. It is, therefore, necessary to advance their professional practice in the context of a real classroom such as through teaching practicum and reflective practice. This…

  11. Managing the College Classroom: Perspectives from an Introvert and an Extrovert

    Science.gov (United States)

    Braden, Stephen W.; Smith, Deborah N.

    2006-01-01

    One of the biggest challenges facing college instructors in the 21st century is classroom misbehavior. The authors propose that how one handles classroom incivility is a matter of personality type. One of the authors is an extrovert; the other an introvert. The authors discuss personality theory, general classroom management, how to identify…

  12. 14 CFR 25.203 - Stall characteristics.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Stall characteristics. 25.203 Section 25.203 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES Flight Stalls § 25.203 Stall characteristics. (a) It must...

  13. An Investigation of Teacher Candidates' Perceptions About Physical Dimension of Classroom Management

    OpenAIRE

    Ozsezer, M. Sencer Bulut; Saban, Ayten Iflazoglu

    2016-01-01

    The purpose of this research is to investigate teacher candidates’ perceptions about the physical dimension of classroom management. A hundred two 3rd year students at the Primary School Education Department of a state university were instructed to visit a primary school and to observe a classroom in terms of its physical dimensions. The students were guided both to tell about the actual classroom they observed and to tell about their dream classroom. Thus, this study aims to discover student...

  14. Managing bereavement in the classroom: a conspiracy of silence?

    Science.gov (United States)

    Lowton, Karen; Higginson, Irene J

    2003-10-01

    The ways in which teachers in British schools manage bereaved children are underreported. This article reports the impact of students' bereavement and their subsequent management in primary and secondary school classrooms in Southeast London. Thirteen school staff working in inner-city schools took part in in-depth interviews that focused on the impact of bereaved children on the school and how teachers responded to these children.All respondents had previously had contact with a local child bereavement service that aims to provide support, advice, and consultancy to children, their parents, and teachers. Interviews were audiotaped, transcribed verbatim, and analyzed using ATLAS-ti. Three main themes were identified from analysis of interview data. Firstly, British society, culture, local communities, and the family were significant influences in these teachers' involvement with bereaved students. Secondly, school staff managed bereaved students through contact with other adults and using practical classroom measures such as "time out" cards and contact books. Lastly, teachers felt they had to be strong, even when they were distressed. Surprise was expressed at the mature reaction of secondary school students to deaths of others. The article recommends that future research needs to concentrate on finding the most effective way of supporting routinely bereaved children, their families, and teachers.

  15. Classroom

    Indian Academy of Sciences (India)

    In this section of Resonance, we invite readers to pose questions likely to be raised in a classroom situation. We may suggest strategies for dealing with them, or invitt responses, or both. "Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching ...

  16. Classroom

    Indian Academy of Sciences (India)

    In this section of Resonance, we invite readers to pose questions likely to be raised in a classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. "Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters reiated to ...

  17. Classroom

    Indian Academy of Sciences (India)

    In this section of Resonance, we invite readers to pose questions likely to be raised in a classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. "Classroom" is equally a forum for raising broader issues arid sharing personal experiences and viewpoints on matters related to ...

  18. Classroom

    Indian Academy of Sciences (India)

    CLASSROOM. Environmental Education in a 'Green Classroom'. Keywords. Environmental attitudes, expe- riential learning, learning outside school, small animals (inverte- brates, insects). Jürgen Drissner1, Hans-Martin. Haase2, Mara Nikolajek3 and. Katrin Hille4. 1,3 Botanical Garden, University of Ulm, D–89081 ULM, ...

  19. Classroom

    Indian Academy of Sciences (India)

    In this section of Resonance, we invite readers to pose questions likely to be raised in a classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. "Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to ...

  20. Classroom

    Indian Academy of Sciences (India)

    a classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. "Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. How Stimulating Ideas Can Generate An Attitude of Inquiry.

  1. From Discipline to Dynamic Pedagogy: A Re-conceptualization of Classroom Management

    OpenAIRE

    Davis, Jonathan Ryan

    2017-01-01

    The purpose of this article is to re-conceptualize the definition of classroom management, moving away from its traditional definition rooted in discipline and control toward a definition that focuses on the creation of a positive learning environment. Integrating innovative, culturally responsive classroom management theories, frameworks, and strategies from contemporary educators, this article examines a new theoretical and conceptual foundation for classroom management—the Dynamic Classroo...

  2. A meta-analysis of the effects of classroom management strategies and classroom management programs on students’ academic, behavioral, emotional, and motivational outcomes

    NARCIS (Netherlands)

    Korpershoek, Hanke; Harms, Truus; de Boer, Hester; van Kuijk, Mechteld; Doolaard, Simone

    This meta-analysis examined which classroom management strategies and programs enhanced students’ academic, behavioral, social-emotional, and motivational outcomes in primary education. The analysis included 54 random and nonrandom controlled intervention studies published in the past decade

  3. Pre-Service Secondary Science and Mathematics Teachers' Classroom Management Styles in Turkey

    Science.gov (United States)

    Yilmaz, Kursad

    2009-01-01

    The aim of this study is to determine Pre-service secondary science and mathematics teachers' classroom management styles in Turkey. In addition, differences in pre-service secondary science and mathematics teachers' classroom management styles by gender, and field of study were examined. In the study, the survey model was employed. The research…

  4. A Study on Teacher Candidates' Competencies in Classroom Management

    Science.gov (United States)

    Selçuk, Gülenaz; Kadi, Aysegül; Yildirim, Remzi; Çelebi, Nurhayat

    2017-01-01

    The objective of this paper is to examine competencies in classroom management of teacher candidates. Research design was determined as pre-experimental research design. Research was conducted with 388 teacher candidates. In this research, these were found; Attitudes of students about competencies in classroom management differ according to…

  5. Social Skills, Problem Behaviors and Classroom Management in Inclusive Preschool Settings

    Science.gov (United States)

    Karakaya, Esra G.; Tufan, Mumin

    2018-01-01

    This study aimed to determine preschool teachers' classroom management skills and investigate the relationships between teachers' classroom management skills and inclusion students' social skills and problem behaviors. Relational screening model was used as the research method. Study group consisted of 42 pre-school teachers working in Kocaeli…

  6. A New Look at Preservice Teachers' Conceptions of Classroom Management and Organization: Uncovering Complexity and Dissonance

    Science.gov (United States)

    Kaufman, Douglas; Moss, David M.

    2010-01-01

    This article examines preservice teachers' conceptions of classroom management and organization in light of their training and beliefs about good teaching. Students in their final year of a 5-year program discussed their definitions and conceptions of classroom management, organization, and rule systems through an open-ended questionnaire.…

  7. From Discipline to Dynamic Pedagogy: A Re-Conceptualization of Classroom Management

    Science.gov (United States)

    Davis, Jonathan Ryan

    2017-01-01

    The purpose of this article is to re-conceptualize the definition of classroom management, moving away from its traditional definition rooted in discipline and control toward a definition that focuses on the creation of a positive learning environment. Integrating innovative, culturally responsive classroom management theories, frameworks, and…

  8. Investigation of Primary School Teachers' Perception of Discipline Types They Use for Classroom Management

    Science.gov (United States)

    Bayraktar, Hatice Vatansever; Dogan, M. Cihangir

    2017-01-01

    The objective of this study is to examine the primary school teachers' the perceptions of discipline types they use for classroom management; and also to find out if there is a statistically significant difference between the perceptions of discipline types used in classroom management according to the demographic characteristics of primary school…

  9. Self-Efficacy Beliefs, Classroom Management, and the Cradle-to-Prison Pipeline

    Science.gov (United States)

    Delale-O'Connor, Lori Ann; Alvarez, Adam J.; Murray, Ira E.; Milner, H. Richard, IV

    2017-01-01

    In this article, we focus on connections between and among teachers' self-efficacy beliefs, classroom management practices, and the cradle to prison pipeline. Drawing from Bandura's (1986) theorization of self-efficacy, we discuss how teachers' beliefs shape their classroom management practices and how these beliefs and practices can be essential…

  10. The Measurement of Classroom Management Self-Efficacy: A Review of Measurement Instrument Development and Influences

    Science.gov (United States)

    O'Neill, Sue Catherine; Stephenson, Jennifer

    2011-01-01

    Teachers' self-efficacy (SE) in their classroom management capabilities is thought to be an important factor in teachers' overall judgements of their teaching SE. Low SE in classroom management has been linked to teacher attrition and burnout, and reduced student learning outcomes. This article provides the first comprehensive review of classroom…

  11. The Relationship between EFL Teachers' Beliefs and Actual Practices of Classroom Management

    Science.gov (United States)

    Aliakbari, Mohammad; Heidarzad, Mohsen

    2015-01-01

    This study aimed at analyzing Iranian EFL teachers' beliefs toward classroom management and the relationship between teachers' beliefs and their actual practices of classroom management in regard with individual variables such as gender, education degree, and teaching experience. The data were collected using a behavior and instructional…

  12. Preschool Education and Primary School Pre-Service Teachers' Perceptions about Classroom Management: A Metaphorical Analysis

    Science.gov (United States)

    Uysal, Hatice; Burçak, Firdevs; Tepetas, Gülüzar Sule; Akman, Berrin

    2014-01-01

    The aim of the research was to determine the perceptions of preschool and primary school teachers about classroom management by means of metaphors. The sample which selected by the use of convenience sampling techniques was drawn from preschool and primary school undergraduate students who had taken the "Classroom Management" course in…

  13. Teachers' Reported Knowledge and Implementation of Research-Based Classroom and Behavior Management Strategies

    Science.gov (United States)

    Moore, Tara C.; Wehby, Joseph H.; Oliver, Regina M.; Chow, Jason C.; Gordon, Jason R.; Mahany, Laura A.

    2017-01-01

    Teachers' reported knowledge about and implementation of research-based classroom and behavior management strategies were examined. A total of 160 elementary teachers from two districts in different regions of the same state completed the researcher-developed "Survey of Classroom and Behavior Management." On average, teachers reported to…

  14. Classroom Management for Kids Who Won't Sit Still and Other "Bad Apples"

    Science.gov (United States)

    Cahill, Susan M.

    2006-01-01

    This article presents a case description of collaboration between an occupational therapist and a general education teacher to develop an effective classroom management system. The classroom management system described here was based on the Alert Program for Self-regulation: How Does Your Engine Run? In addition, the case description provides a…

  15. Predicting Language Teachers' Classroom Management Orientations on the Basis of Their Computer Attitude and Demographic Characteristics

    Science.gov (United States)

    Jalali, Sara; Panahzade, Vahid

    2014-01-01

    The advent of modern technologies has had a remarkable role in revolutionizing the classroom setting. It is, therefore, incumbent on teachers to utilize strategies for effective managing of the change. The aim of the present study was to find out English as a Foreign Language (EFL) teachers' beliefs regarding classroom management. In so doing, the…

  16. A Qualitative Study Investigating Facility Managers' Perceptions of the Classroom Learning Environment

    Science.gov (United States)

    Parr, Eric Shannon

    2017-01-01

    Facility managers have the challenge of adhering to community college policies and procedures while fulfilling requirements of administration, students, and teachers concerning specific needs of classroom aesthetics. The role of facility manager and how specific entities affect perceptions of the design and implementation of classroom aesthetics…

  17. Students as Employees: Applying Performance Management Principles in the Management Classroom

    Science.gov (United States)

    Gillespie, Treena L.; Parry, Richard O.

    2009-01-01

    The student-as-employee metaphor emphasizes student accountability and participation in learning and provides instructors with work-oriented methods for creating a productive class environment. The authors propose that the tenets of performance management in work organizations can be applied to the classroom. In particular, they focus on three…

  18. Classroom organization and management for effective teaching and learning at the intermediate phase in the Mafikeng District of the North West Province / Mmapula Joyce Segatlhe

    OpenAIRE

    Segatlhe, Mmapula Joyce

    2003-01-01

    This study concerns itself with issues relating to classroom management and organisation for effective teaching and learning. The study focuses on these aspects of classroom management and organisation: What is classroom management? What is effective within the management of the classroom? What role does or should a teacher play in classroom management? What contributions do discipline and 'tasks' make to effective classroom management in the Mafikeng District? Eighteen primary...

  19. Exploring the Complexity of Classroom Management: 8 Components of Managing a Highly Productive, Safe, and Respectful Urban Environment

    Science.gov (United States)

    Jones, Karrie A.; Jones, Jennifer L.; Vermette, Paul J.

    2013-01-01

    Creating a learning environment where all students can thrive academically requires an understanding of the complexities of classroom management. The notions of "discipline," "conformity" and "obedience" that have littered discussions of classroom management in the past are no longer sufficient to describe the diverse…

  20. Student Well-Being Interventions: The Effects of Stress Management Techniques and Gratitude Journaling in the Management Education Classroom

    Science.gov (United States)

    Flinchbaugh, Carol L.; Moore, E. Whitney G.; Chang, Young K.; May, Douglas R.

    2012-01-01

    Student well-being in the management classroom is of concern to both educators and managers. Well-being is conceptualized here as students' reduction in stress, enhanced experienced meaning and engagement in the classroom, and, ultimately, heightened satisfaction with life. The authors investigated whether purposeful semester-long classroom…

  1. Preliminary Evidence on the Efficacy of Mindfulness Combined with Traditional Classroom Management Strategies.

    Science.gov (United States)

    Kasson, Erin M; Wilson, Alyssa N

    2017-09-01

    The current case study combined mindfulness-based strategies with a classroom behavior management treatment package, to assist teachers with managing 3rd grade student behaviors. Two teachers (Classroom teacher and Specials teacher) and six students within the same classroom were observed using a 5-min momentary time sampling procedure. A delayed multiple baseline across settings (e.g., Classroom teacher, Specials teacher) design was used to assess student behaviors across baseline (A), classroom behavior management treatment package (CBM) (B), CBM plus mindfulness (C), and CBM plus mindfulness and self-monitoring (D). Behavioral treatment alone increased on-task behaviors for four of six (66%) students compared to baseline; however, five of six (83%) students increased and sustained high rates of on-task behaviors when mindfulness exercises were added to the behavior analytic techniques. These preliminary results support the combination of mindfulness-based strategies with traditional behavior analytic interventions for increasing student on-task behaviors in classroom settings.

  2. Teacher's Classroom Management Behavior and Students' Classroom Misbehavior: A Study with 5th through 9th-Grade Students

    Science.gov (United States)

    Lopes, João; Silva, Elisabete; Oliveira, Célia; Sass, Daniel; Martin, Nancy

    2017-01-01

    Introduction: Classroom misbehavior is a major source of classroom-wasted time and a situation that negatively interferes with students' opportunity to learn. Method: The present study investigated the relation between 5th through 9th grade perceived Portuguese teacher's classroom management, teacher's perceived time spend with misbehavior,…

  3. Classroom

    Indian Academy of Sciences (India)

    Classroom" section of Resonance, February 1996. As a teacher of chemistry, I read the author's observations on the textbook experiment to determine the percentage of oxygen in air, with great interest. I carried out this experiment carefully, as follows:.

  4. Classroom

    Indian Academy of Sciences (India)

    Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. 5 N Moitra. Mathematics Department. National Defence Academy. Khadakvasla ...

  5. Classroom

    Indian Academy of Sciences (India)

    Vite responses, or both. "Classroom" is equally a forum for raising broader issues and sharing personal experiences and 'Viewpoints on matter·s related to teaching and learning science. , Teaching and Learning Genetics with Drosophila. 2.

  6. Classroom

    Indian Academy of Sciences (India)

    Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. N Kumar. Raman Research Institute. C V Raman Avenue, Bangalore. 560 080, India.

  7. Classroom

    Indian Academy of Sciences (India)

    Classroom" is equally a forum for raising broader issues and sharing personal experiences and 'Viewpoints on matters related to teaching and learning science. R Vasudeva, Department of. Statistics, University of Mysore,. Mysore 570006, India ...

  8. Classroom

    Indian Academy of Sciences (India)

    Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. Ashok Singh. Department of Mathematics. Government Nehru Memorial. College.

  9. Classroom

    Indian Academy of Sciences (India)

    Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. P H Talapadtur c/o Secretary. School of Mathematics. TlFR, Homi Bhabha Road.

  10. Managing the Classroom with Technology. On Progress Reports and Online Communications, and How To Manage the Two Different Communication Techniques.

    Science.gov (United States)

    Kasprowicz, Tim

    2002-01-01

    Describes how one teacher bridged the communications gap among teachers, parents, and students through the use of technology in managing his classroom. Discusses progress reports and online communications and how to manage the two different communication techniques. (JOW)

  11. Pre-Service Teacher Training in Classroom Management: A Review of State Accreditation Policy and Teacher Preparation Programs

    Science.gov (United States)

    Freeman, Jennifer; Simonsen, Brandi; Briere, Donald E.; MacSuga-Gage, Ashley S.

    2014-01-01

    Effective classroom management skills are essential for teachers. Unfortunately, many teachers do not receive adequate classroom management training prior to beginning their teaching careers and feel unprepared for the demands of managing student behaviors in their classrooms. In this article, we describe (a) the number of states with state policy…

  12. Classroom Management Issues in Information and Communication Technology (ICT)-Mediated Learning Environments: Back to the Basics

    Science.gov (United States)

    Lim, Cher Ping; Pek, Meow Sien; Chai, Ching Sing

    2005-01-01

    Research studies have shown that effective classroom management is a necessary condition for successful ICT integration in schools. Drawing upon the classroom management practices of teachers in a Singapore primary school, this article describes how the elements of classroom management facilitate the creation of a conducive learning environment to…

  13. Examining classroom influences on student perceptions of school climate: the role of classroom management and exclusionary discipline strategies.

    Science.gov (United States)

    Mitchell, Mary M; Bradshaw, Catherine P

    2013-10-01

    There is growing emphasis on the use of positive behavior supports rather than exclusionary discipline strategies to promote a positive classroom environment. Yet, there has been limited research examining the association between these two different approaches to classroom management and students' perceptions of school climate. Data from 1902 students within 93 classrooms that were nested within 37 elementary schools were examined using multilevel structural equation modeling procedures to investigate the association between two different classroom management strategies (i.e., exclusionary discipline strategies and the use of positive behavior supports) and student ratings of school climate (i.e., fairness, order and discipline, student-teacher relationship, and academic motivation). The analyses indicated that greater use of exclusionary discipline strategies was associated with lower order and discipline scores, whereas greater use of classroom-based positive behavior supports was associated with higher scores on order and discipline, fairness, and student-teacher relationship. These findings suggest that pre-service training and professional development activities should promote teachers' use of positive behavior support strategies and encourage reduced reliance on exclusionary discipline strategies in order to enhance the school climate and conditions for learning. Copyright © 2013 Society for the Study of School Psychology. Published by Elsevier Ltd. All rights reserved.

  14. The Incredible Years Teacher Classroom Management Program: Using Coaching to Support Generalization to Real-World Classroom Settings

    Science.gov (United States)

    Reinke, Wendy M.; Stormont, Melissa; Webster-Stratton, Carolyn; Newcomer, Lori L.; Herman, Keith C.

    2012-01-01

    This article focuses on the Incredible Years Teacher Classroom Management Training (IY TCM) intervention as an example of an evidence-based program that embeds coaching within its design. First, the core features of the IY TCM program are described. Second, the IY TCM coaching model and processes utilized to facilitate high fidelity of…

  15. The Effects of Virtual Communities on Group Identity in Classroom Management

    Science.gov (United States)

    Ho, Tu-Kuang; Lin, Yu-Tzeng

    2016-01-01

    Group identity is a critical component in developing effective classroom management. While there have been numerous studies on group identity, they have primarily focused on its effects on the physical classroom entity. Advances in information technology, however, have enabled the creation of virtual communities, which have become a vital channel…

  16. Lecturers' Perception of Classroom Management: An Empirical Study of Higher Learning Institutions in Malaysia

    Science.gov (United States)

    Grapragasem, Selvaraj; Krishnan, Anbalagan; Joshi, Prem Lal; Krishnan, Shubashini; Azlin, Azlin

    2015-01-01

    The classroom is a learning environment where active interactions and meaningful learning occur between learners and knowledge providers. The teachers and the learners have a unique relationship and this relationship is highly determined by their backgrounds and experiences. Teachers have the responsibility to manage the classroom with the aim of…

  17. The Caterpillar Game: A SW-PBIS Aligned Classroom Management System

    Science.gov (United States)

    Floress, Margaret T.; Jacoby, Amber L.

    2017-01-01

    The Caterpillar Game is a classroom management system that is aligned with School-wide Positive Behavioral Interventions and Supports standards. A single-case, multiple-baseline design was used to evaluate the effects of the Caterpillar Game on disruptive student behavior and teacher praise. Three classrooms were included in the study (preschool,…

  18. An Investigation of Teacher Candidates' Perceptions about Physical Dimension of Classroom Management

    Science.gov (United States)

    Bulut Ozsezer, M. Sencer; Iflazoglu Saban, Ayten

    2017-01-01

    The purpose of this research is to investigate teacher candidates' perceptions about the physical dimension of classroom management. A hundred two 3rd year students at the Primary School Education Department of a state university were instructed to visit a primary school and to observe a classroom in terms of its physical dimensions. The students…

  19. The Relationship between Critical Thinking Abilities and Classroom Management Skills of High School Teachers

    Science.gov (United States)

    Demirdag, Seyithan

    2015-01-01

    High school teachers experience difficulties while providing effective teaching approaches in their classrooms. Some of the difficulties are associated with the lack of classroom management skills and critical thinking abilities. This quantitative study includes non-random selection of the participants and aims to examine critical thinking…

  20. Key Factors that Enable the Successful Management of Difficult Behaviour in Schools and Classrooms

    Science.gov (United States)

    Visser, John

    2005-01-01

    This paper argues that there are common factors in successful classroom practice with regard to managing behaviour in classrooms, and particularly when teachers successfully meet the needs of pupils with social, emotional and behavioural difficulties (SEBD). These common factors could be used to predict the success of current and future…

  1. The Impact of Years of Teaching Experience on the Classroom Management Approaches of Elementary School Teachers

    Science.gov (United States)

    Unal, Zafer; Unal, Aslihan

    2012-01-01

    This study provided a basis for answering the following essential question: Does the years of experience affect teachers' classroom management approaches? Data were collected from 268 primary school teachers. The findings of this study demonstrated that experienced teachers are more likely to prefer to be in control in their classrooms than…

  2. Classroom

    Indian Academy of Sciences (India)

    "Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. School in the forest. A joint experiment between Centre for Learning and Gurukula. Botanical Sanctuary. What do a school in Bangalore and a forest garden in the.

  3. Classroom

    Indian Academy of Sciences (India)

    ite image of the Mercury. Transit, taken by Domin- ique Derrick, Belgium, on the 7th of May 2003. (repro- duced with permission). CLASSROOM scale in our understanding of the Universe - the Astronomical. Unit, or the mean distance between the Earth and the Sun. Historically, the transits of Venus were the first opportunity.

  4. Classroom

    Indian Academy of Sciences (India)

    In this section of Resonance, we invite readers to pose questions likely to be raised in a classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. “Classroom” is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to ...

  5. Classroom

    Indian Academy of Sciences (India)

    responses, or both. "Classroom" is equally ti forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. .... Rate (R) = k [Acid]P [NaHC0. 3. ] q. The values of p and q for HCOOH-NaHC0. 3 reaction are calculated as follows as an illustration. Rset - I.

  6. Classroom

    Indian Academy of Sciences (India)

    them, or invite responses, or both. "Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters ... find the values taken by f at some n distinct points ao, aI,. ,an-I, one can determine the values of the Ci'S from the usual method of solving a system of linear equa- tions.

  7. Classroom

    Indian Academy of Sciences (India)

    Srimath

    classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. “Classroom” is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. Surya Majjana ... MES College of Arts, Com- merce and Science ...

  8. Classroom

    Indian Academy of Sciences (India)

    IAS Admin

    classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. “Classroom” is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. Pythagorean Theorem From Heron's Formula: Another Proof.

  9. Classroom

    Indian Academy of Sciences (India)

    Reduction in dimensionality of bio- logical diffusion pro- cesses, in Structural. Chemistry and Molecular. Biology, (Edns) N David- son and A Rich, W H. Freeman, San Francisco,. 1968. From Uday Maitra, Indian Institute of Science, Bangalore. ClASSROOM what happens. Given any point, however far away from the origin,.

  10. Classroom

    Indian Academy of Sciences (India)

    ias

    tum associated with such an apparently simple purely oscillatory 1D harmonic lattice system. The classroom exercise will conclude with a sug- gestion for the possibility that the 'Concrete' case may well correspond to that of hard nanopar- ticulate crystallites embedded in a 1D elastic con- tinuum, e.g., a spider dragline silk, ...

  11. Classroom

    Indian Academy of Sciences (India)

    "Classroom" is equally a foru11J. for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. Point Set Topological Proof of 'no-retraction'. Theorem for 2 and 3 Dimensional Cases. Sourav Chakraborty. C/o Suprakash Chakraborty. D-138, Grissom Street.

  12. Classroom

    Indian Academy of Sciences (India)

    "Classroom" is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science. Jyoti Ramakrishnan. M.Stat. lind Year. Indian Statistical Institute ... is, as evident from the normal meaning of the English word, a correspondence which associates ...

  13. Classroom

    Indian Academy of Sciences (India)

    manipulate and gain experimental knowledge from. The minds-on examples serve to consistently stimulate the mind of both the self-starter student and the bored/disinterested student to develop an attitude of inquiry. Motivation in the Classroom. What, exactly, is a discrepant event? A discrepant event is a phenomenon that ...

  14. The Interplay among Emotional Intelligence, Classroom Management, and Language Proficiency of Iranian EFL Teachers

    Directory of Open Access Journals (Sweden)

    Hadi Hamidi

    2016-06-01

    Full Text Available The present study was an attempt to investigate the interplay among Iranian EFL teachers’ emotional intelligence, classroom management, and their general English language proficiency. The result of the data analysis showed that: 1 there was a statistically significant relationship between the emotional intelligence and the classroom management of Iranian EFL teachers, 2 there was a statistically significant relationship between the emotional intelligence and the language proficiency of Iranian EFL teachers, and 3 there was a statistically significant relationship between the classroom management and the language proficiency of Iranian EFL teachers. Teacher trainers, researchers in teacher education, and language teachers may benefit from the findings of the present research.

  15. Clutch-Starting Stalled Research Students

    Science.gov (United States)

    Ahern, Kathy; Manathunga, Catherine

    2004-01-01

    Many research students go through periods where their research seems to stall, their motivation drops, and they seem unable to make any progress. As supervisors, we attempt to remain alert to signs that our student's progress has stalled. Drawing on cognitive strategies, this article explores a problem-solving model supervisors can use to identify…

  16. Basis for an Active Stall Avoidance System

    Directory of Open Access Journals (Sweden)

    Richard Schulze

    2000-01-01

    Full Text Available A single-stage subsonic compressor was examined with respect to compressor instabilities. During the inception of rotating stall, the transients of the pressure rise and mass flow were measured as well as their hysteresis. The development of the stall cell and the characteristics of the unstable operating range were determined.

  17. How Confident Are Kindergarten Teachers in Their Ability to Keep Order in the Classroom? A Study of Teacher Efficacy in Classroom Management

    Science.gov (United States)

    Cobbold, Cosmas; Boateng, Philip

    2016-01-01

    The objective of the study was to investigate kindergarten teachers' efficacy beliefs in classroom management. The sample size was 299 teachers drawn from both public and private kindergarten schools in the Kumasi Metropolis of Ghana. The efficacy beliefs of the teachers with respect to their classroom management practices were measured on a…

  18. Managing Inquiry-Based Science: Challenges in Enacting Complex Science Instruction in Elementary and Middle School Classrooms

    Science.gov (United States)

    Harris, Christopher J.; Rooks, Deborah L.

    2010-03-01

    Effectively enacting inquiry-based science instruction entails considerable changes in classroom management practices. In this article, we describe five interconnected management areas that need to be addressed when managing an inquiry-oriented K-8 science classroom. We introduce a pyramid model as a framework for thinking about these management areas and present a brief review of what the research literature says about each area. We propose that enacting inquiry-based instruction requires a different kind of approach to classroom management that takes into account the close-knit relationship between management and instruction. This perspective recognizes the pervasive nature of managing the classroom for inquiry learning.

  19. Asthma management in New York City schools: A classroom teacher perspective.

    Science.gov (United States)

    Cain, Agnieszka; Reznik, Marina

    2016-09-01

    Classroom teachers play an important role in facilitating asthma management in school but little is known about their perspectives around asthma management. We examined the perspectives of classroom teachers around barriers to school asthma management. We conducted key informant interviews with 21 inner-city classroom teachers from 3rd to 5th grades in 10 Bronx, New York elementary schools. Sampling continued until thematic saturation was reached. Interviews were recorded, transcribed, and independently coded for common themes. We used thematic and content review to analyze interview data. Seven themes representing teachers' perspectives on in-school asthma management emerged: (1) the problematic process of identifying students with asthma; (2) poor familiarity with the city health department's asthma initiative and poor general knowledge of school policies on asthma management; (3) lack of competency in managing an acute asthma attack in the classroom and poor recognition of symptoms of an asthma attack; (4) lack of confidence in dealing with a hypothetical asthma attack in the classroom; (5) lack of quick access to asthma medication in school; (6) limited communication between school staff; and (7) enthusiasm about learning more about asthma management. Our results revealed several barriers contributing to suboptimal in-school asthma management: ineffective ways of identifying students with asthma, lack of teacher knowledge of guidelines on asthma management, lack of comfort in managing students' asthma, inadequate access to asthma medication in school, and limited communication between school staff. These issues should be considered in the design of interventions to improve in-school asthma management.

  20. Classroom

    Indian Academy of Sciences (India)

    1048. RESONANCE │ November 2011. CLASSROOM. Recall that spheres are smooth and there is no force along the ^z-axis. Therefore viz = v0iz and vjz = v0jz : (6). Using the above equations we can show that v0in = vin1 − e. 2. + vjn. 1 + e. 2. ;. (7) v0jn = vin. 1 + e. 2. + vjn1 − e. 2. : (8). The change in kinetic energy can ...

  1. Classroom

    Indian Academy of Sciences (India)

    CLASSROOM. The subscript on S corresponds to the value of n in (4). Various distances are measured. The angle of grazing incidence can be calculated from. 2fJ = tan-1 (OS/PO). (6). Note that () is not pre-decided. The scale is fixed at a certain inclination and () is obtained by measuring OS and PO. The angle d ()n can be ...

  2. Classroom

    Indian Academy of Sciences (India)

    are told to take a pair of bunsen burners and keep them burning at a distance of roughly six ... burners. We were expecting to demonstrate that within the six inch aseptic zone there would be fey.l or no bacteria. To our great surprise, this didn't happen. CLASSROOM .... else can we do if there is no power?). One teacher said ...

  3. Ordering within Moral Orders to Manage Classroom Trouble

    Science.gov (United States)

    Doherty, Catherine; McGregor, Rowena; Shield, Paul

    2016-01-01

    This paper demonstrates how classroom trouble warranting teacher intervention can stem from transgressions in different layers of the complex moral order regulating classroom interactions. The paper builds from Durkheim's treatment of schooling as the institution responsible for the inculcation of a shared moral order, Bernstein's distinction…

  4. Variety and Preparation Are Keys to Classroom Management

    Science.gov (United States)

    Moore, Patience

    2007-01-01

    Elementary music teachers walk a thin line between encouraging enthusiasm and allowing Cat in the Hat mayhem in the classroom. A teacher is not doing his or her job if the students are not experiencing excitement with music, but they can't do their job when the classroom becomes a playground. In this article, the author discusses the importance of…

  5. Evaluation of a "Flipped Classroom" Approach in Management Education

    Science.gov (United States)

    Bergfjord, Ole Jakob; Heggernes, Tarjei

    2016-01-01

    In this paper, a "flipped classroom" approach is evaluated using three different datasets. We use student evaluations of the "flipped classroom" in particular, in addition to regular course evaluations and exam results for the past three years in order to allow for statistical comparisons. Overall, the results are quite…

  6. Construction of hydrogenation stalls for explosions

    Energy Technology Data Exchange (ETDEWEB)

    Raichle, L.

    1943-05-03

    This report contained explanations for different questions that had been asked by the Association of Chemical Manufacturers. The first item discussed was the pressure occurring in hydrogenation stalls in hydrogen explosions. The pressures actually used were much smaller than the maximum design pressure due to burning gases being allowed to escape from the top and front of the stalls since these areas were open and it could not be assumed that the whole stall space was filled with a 32% hydrogen concentration at the beginning of an explosion. The second item discussed was specifications and rules for the building of hydrogenation stalls. These included the calculations for simple wind pressure according to the Building Code with the usual safety factors and the calculations for an inner pressure of 300 kg/m/sup 2/ with the usual safety factors. An explanation of a stall explosion in Poelitz and reinforced stall construction in Poelitz were two other items that were discussed. Appendix I of the report involved maximum pressures and temperature in hydrogen explosions. Diagram I was involved with this. Appendix II discussed the behavior of a hydrogen flame at high emerging velocities and Appendix III discussed stall construction at Poelitz.

  7. RE-SERVICE TEACHERS’ VIEWS ON WEB-BASED CLASSROOM MANAGEMENT

    Directory of Open Access Journals (Sweden)

    Adnan BOYACI

    2010-04-01

    Full Text Available With the invention of World Wide Web in 1992, delivery of distance education via internet and emergency of web-based classrooms have rapidly gained acceptance as an alternative and supplement to traditional face to face classroom instruction (Alavi, Yoo & Vogel, 1997; Rahm & Reed, 1997, which represents a paradigm shift challenging all traditionally accepted assumptions concerning dynamics of classroom management. Classroom is highly complicated environment with its features of multi-dimensionality, simultaneity, immediacy, unpredictability, publicness and history. And web based classroom is more complicated than traditional classroom because the web technology is added. Students’ views are considered by many researchers as one of the critical and valid source data in evaluating the teaching effectiveness and learning settings. The purpose of this study is to find out views of pre-service teachers about web based classroom management. With qualitative research method, particularly descriptive technique 20 pre-service teachers’ views were evaluated. Research findings revealed that students defined web-based classroom management with extra workloads of the students thus effectiveness is associated with students’ roles. Guiding/mentoring on technical issues, on the field knowledge, classroom interaction were defined by the students as the essential leadership roles of teachers. Concerning interaction while student to course content/material interaction was perceived as satisfactory, level of student to student interaction was reported as low. Web-based instruction itself and being free form time and place emerged as motivating factors. Besides, discipline is identified within the responsibility of students and accessing information without time/place limitation was perceived as advantageous side of web based classroom.

  8. On the Relationship between EFL Teachers' Classroom Management Approaches and the Dominant Teaching Style: A Mixed Method Study

    Science.gov (United States)

    Kazemi, Ali; Soleimani, Neda

    2016-01-01

    As a factor contributing to a successful teaching career, classroom management can be affected by many latent and explicit variables. In this mixed method study, the researchers sought to scrutinize the possible connections among EFL teachers' classroom management approaches at two dimensions of behavior management and instructional management and…

  9. A Meta-Analysis of the Effects of Classroom Management Strategies and Classroom Management Programs on Students' Academic, Behavioral, Emotional, and Motivational Outcomes

    Science.gov (United States)

    Korpershoek, Hanke; Harms, Truus; de Boer, Hester; van Kuijk, Mechteld; Doolaard, Simone

    2016-01-01

    This meta-analysis examined which classroom management strategies and programs enhanced students' academic, behavioral, social-emotional, and motivational outcomes in primary education. The analysis included 54 random and nonrandom controlled intervention studies published in the past decade (2003-2013). Results showed small but significant…

  10. The Relevance of the Dynamic Stall Effect for Transient

    DEFF Research Database (Denmark)

    Jauch, Clemens; Sørensen, Poul; Bak-Jensen, Birgitte

    2005-01-01

    This article describes a methodology to quantify the influence of dynamic stall on transient fault operations of active-stall turbines. The model of the dynamic stall effect is introduced briefly. The behaviour of the dynamic stall model during a transient fault operation is described mathematica...

  11. Biomimetic Wind Turbine Design with Lift Enhancing Periodic Stall

    NARCIS (Netherlands)

    Stamhuis, Eize Jan

    2017-01-01

    A wind turbine includes a rotor; a blade; and a periodic stall system. The periodic stall system selectively moves at least part of the blade in an oscillating motion whereby an angle of incidence continuously varies to invoke periodic stall. The periodic stall system can move the entire blade or

  12. Pyramid training of elementary school teachers to use a classroom management "skill package".

    Science.gov (United States)

    Jones, F H; Fremouw, W; Carples, S

    1977-01-01

    Three regular elementary teachers were trained in the use of a classroom management "skill package". Subsequently, each of these three teachers (tier 1 of training) trained three more teachers to use the same skill package (tier 2 of training). Direct behavioral measures of student disruptiveness were taken in the three tier-1 classrooms and four tier-2 classrooms, and permanent product measures of student productivity in arithmetic were taken in the three tier-1 classrooms. Results indicated that student disruptiveness decreased at least as much in the tier-2 classrooms as in the tier-1 classrooms. Data also indicated that serving as trainers benefited two of the tier-1 teachers who profited least from the original training by producing further reductions in disruptiveness in their respective classrooms. Productivity data suggested that use of the "skill package" increased classroom academic output, especially for those students below the median in productivity during baseline. The investigators' time investment in training a tier-2 teacher was one-fourth that of training a tier-1 teacher.

  13. Prediction of induced vibrations in stall

    Energy Technology Data Exchange (ETDEWEB)

    Thirstrup Petersen, J.; Thomsen, K.; Aagaard Madsen, H. [Risoe National Lab., Wind Energy and Atmospheric Physics Dept., Roskilde (Denmark)

    1999-03-01

    The main results from recent research in stall induced vibrations are presented. The focus is on the edgewise blade vibrations, which during the last decade have turned out to be a potential threat against the stable operation of stall regulated wind turbines and a fact, which must be dealt with by the designer. The basic physical explanation for the phenomenon and examples of design precaution, which can be taken, are presented. (au)

  14. The impact of Flipped Classroom on the motivation and learning of students in Operations Management

    Directory of Open Access Journals (Sweden)

    Eloísa Díaz Garrido

    2017-06-01

    Full Text Available The objective of this work is to analyze the effectiveness of the Flipped Classroom methodology in the discipline of Operations Management, analyzing for this the motivation of the students and their learning results in terms of the acquisition of skills and qualifications obtained. Specifically, a comparative analysis is carried out with two teaching groups, having applied the methodology of Flipped Classroom only in one of them. -------------- El impacto del flipped classroom en la motivación y en el aprendizaje de los estudiantes en la asignatura Dirección de Operaciones

  15. Assessment of special education teachers about their skills for classroom management

    OpenAIRE

    Černe, Maja

    2016-01-01

    The aim of this diploma thesis was to research the perceived self-efficacy in classroom management among special education teachers who teach in an adapted education program with lower educational standards. We wanted to evaluate how prepared are they to meet the challenges in maintaining classroom discipline. In the theoretical part of the thesis, we described the characteristics of pupils with mild intellectual disabilities and their education in an adapted educational program with lower ed...

  16. More explicit communication after classroom-based crew resource management training: results of a pragmatic trial

    NARCIS (Netherlands)

    van Noord, I.; de Bruijne, M.C.; Twisk, J.W.R.; van Dyck, C.; Wagner, C.

    2015-01-01

    Rationale, aims and objectives Aviation-based crew resource management trainings to optimize non-technical skills among professionals are often suggested for health care as a way to increase patient safety. Our aim was to evaluate the effect of a 2-day classroom-based crew resource management (CRM)

  17. Etched Impressions: Student Writing as Engaged Pedagogy in the Graduate Sport Management Classroom

    Science.gov (United States)

    Veri, Maria J.; Barton, Kenny; Burgee, David; Davis, James A., Jr.; Eaton, Pamela; Frazier, Cathy; Gray, Stevie; Halsey, Christine; Thurman, Richard

    2006-01-01

    This article illustrates the pedagogical value of employing student narrative writing assignments in the graduate sport management classroom and advocates for cultural studies and critical pedagogy approaches to teaching sport management. The article considers students' autobiographical narratives within a theoretical framework of cultural…

  18. More explicit communication after classroom-based crew resource management training: results of a pragmatic trial.

    NARCIS (Netherlands)

    Verbeek-van Noord, I.; Bruijne, M.C. de; Twisk, J.W.R.; Dyck, C. van; Wagner, C.

    2015-01-01

    Rationale, aims and objectives: Aviation-based crew resource management trainings to optimize non-technical skills among professionals are often suggested for health care as a way to increase patient safety. Our aim was to evaluate the effect of a 2-day classroom-based crew resource management (CRM)

  19. The Classroom as Stage: Impression Management in Collaborative Teaching

    Science.gov (United States)

    Preves, Sharon; Stephenson, Denise

    2009-01-01

    This article explores the social-psychological process of identity negotiation in collaborative teaching, using Erving Goffman's (1959) theoretical tradition of dramaturgy to analyze the classroom itself as a performance venue. A dramaturgical analysis of collaborative teaching is especially significant given this growing pedagogical trend because…

  20. Management of Group Work as a Classroom Activity

    Science.gov (United States)

    Chiriac, Eva Hammar; Frykedal, Karin Forslund

    2011-01-01

    Students appreciate group work as a means of learning and several studies also suggest that students who work together in groups have better learning outcomes. Nevertheless, teachers still seem reluctant to use group work as a pedagogical tool in the classroom. The main focus of this qualitative study is to address group work as a classroom…

  1. Investigating the Usability of Classroom Management Strategies among Elementary Schoolteachers

    Science.gov (United States)

    Briesch, Amy M.; Briesch, Jacquelyn M.; Chafouleas, Sandra M.

    2015-01-01

    Although teachers are often asked to implement classroom interventions to address student behavior, little is known about their perceived usability of many evidence-based strategies. One thousand five elementary schoolteachers completed the Usage Rating Profile-Intervention-Revised (URP-IR) with regard to the use of one of five evidence-based…

  2. Plasma-based Compressor Stall Control

    Science.gov (United States)

    McGowan, Ryan; Corke, Thomas

    2017-11-01

    The use of dielectric barrier discharge (DBD) plasma actuator casing treatment to prevent or delay stall inception in an axial fan is examined. The actuators are powered by a pulsed-DC waveform which induces a larger peak velocity than a purely AC waveform such as a sine or sawtooth wave. With this system, a high-voltage DC source is supplied to both electrodes, remaining constant in time for the exposed electrode. Meanwhile, the covered electrode is periodically grounded for several microseconds and allowed to rise back to the source DC level. To test the actuators' ability to interact with and modify the formation of stall cells, a facility has been designed and constructed around nonconductive fan blades. The actuators are installed in the fan casing near the blade tips. The instrumentation allows for the measurement of rotating pressure disturbances (traveling stall cells) in this tip gap region as well as fan performance characteristics including pressure rise and flow rate. The casing plasma actuation is found to reduce the correlation of the rotating stall cells, thereby extending the stall margin of the fan. Various azimuthal arrangements of the plasma actuator casing treatment is explored, as well as input voltage levels to the actuator to determine optimum conditions. NASA SBIR Contract NNX14CC12C.

  3. The relevance of the dynamic stall effect for transient fault operations of active-stall wind turbines

    Energy Technology Data Exchange (ETDEWEB)

    Jauch, Clemens; Soerensen, Poul; Jensen, Birgitte Bak

    2005-06-15

    This article describes a methodology to quantify the influence of dynamic stall on transient fault operations of active-stall turbines. The model of the dynamic stall effect is introduced briefly. The behaviour of the dynamic stall model during a transient fault operation is described mathematically, and from this its effect quantified. Two quantities are chosen to describe the influence of the dynamic stall effect: one is active power and the other is time delay. Subsequently a transient fault scenario is simulated with and without the dynamic stall effect and the differences discussed. From this comparison, the conclusion is drawn that the dynamic stall effect has some influence on the post-fault behaviour of the wind turbine, and it is hence suggested that the dynamic stall effect is considered if an active-stall wind turbine is to be modelled realistically. (Author)

  4. Time Management: Addressing and Assessing Classroom Participation Problems

    Science.gov (United States)

    2015-01-01

    the classroom has costs, in econometrics (as in other technical courses) computer use is very nearly a necessary condition. Therefore, I used a...during one section of Econ 365 ( Econometrics ). Econometrics is an ideal course in which to test effects because computers are necessary to complete...in econometrics (as in other technical courses) computer use is very nearly a necessary condition. Therefore, we want to test the impact of 1) low

  5. Discussion on the management system technology implementation of multimedia classrooms in the digital campus

    Science.gov (United States)

    Wang, Bo

    2018-04-01

    Based on the digitized information and network, digital campus is an integration of teaching, management, science and research, life service and technology service, and it is one of the current mainstream construction form of campus function. This paper regarded the "mobile computing" core digital environment construction development as the background, explored the multiple management system technology content design and achievement of multimedia classrooms in digital campus and scientifically proved the technology superiority of management system.

  6. A Meta-Analysis: Student Misbehaviors That Affect Classroom Management

    Directory of Open Access Journals (Sweden)

    Gülay Dalgıç

    2014-05-01

    Full Text Available Research on student misbehaviors in classroom have focused on the identification of most frequent misbehaviors and individual practices used by the teachers. However there is still a significant gap about the demographic and other factors that affect teachers’ perceptions of misbehaviors in classrooms. This meta-analysis reviewed the literature in Turkey on student misbehaviors from the views of teachers and demographic factors in theses and published articles between 2000-2012. The sample included 3648 teachers gathered from 16 studies. The results highlight that task avoidance, constant talking with classmates, verbal hostility towards peers and teacher, indifference to study subject during classes, damaging school stuff, and coming late are the most frequent student misbehavior types reported by teachers. Results showed a small relation between perceived student misbehavior and teachers’ teaching field, teacher seniority, educational background of teachers, and number of students in classroom. Gender was not determined as a statistically significant variable in determining teachers’ perceptions of student misbehavior. Practical implications for future research and practices are discussed.

  7. Relationship between Academic Optimism and Classroom Management Styles of Teachers--Case Study: Elementary School Teachers in Isfahan

    Science.gov (United States)

    Moghtadaie, L.; Hoveida, R.

    2015-01-01

    The purpose of this study was to investigate the relationship between classroom management styles of the teachers and their academic optimism. In this study, three types of classroom management styles (interventionist style, interactionist style, and non-interventionist style) have been considered. Research community is all public primary school…

  8. Multitiered Support Framework for Teachers' Classroom-Management Practices: Overview and Case Study of Building the Triangle for Teachers

    Science.gov (United States)

    Simonsen, Brandi; MacSuga-Gage, Ashley S.; Briere, Donald E.; Freeman, Jennifer; Myers, Diane; Scott, Terrance M.; Sugai, George

    2014-01-01

    Many teachers enter the field without sufficient training in classroom management and continue to experience challenges throughout their careers. Therefore, school-based leaders need a multi-tiered support (MTS) framework to (a) provide training to all teachers in classroom management (Tier 1), (b) identify teachers who require additional…

  9. Measuring Practicing and Prospective Elementary Teachers' Efficacy for Classroom Management: A Preliminary Development and Validation Study

    Science.gov (United States)

    Putman, S. Michael

    2013-01-01

    Research has shown efficacy exerts a powerful influence on behavior. Classroom management represents one vehicle for demonstrations of these behaviors, yet few instruments focus solely on the measurement of this domain-specific form of efficacy. This research explored the relationship between teacher self-efficacy and classroom management through…

  10. "My Lesson Plan Was Perfect Until I Tried to Teach": Care Ethics into Practice in Classroom Management

    Science.gov (United States)

    Rabin, Colette; Smith, Grinell

    2016-01-01

    As teacher educators, the authors developed an assignment focused on care ethics to prepare teacher candidates to design classroom-management procedures aimed at cultivating caring community. The teacher candidates revised traditional classroom-management processes, such as class rules, into cocreated norms. They also designed original management…

  11. A Comparison of Teacher Classroom Management Practices and Presage Variables on High and Low Performing Elementary Schools

    Science.gov (United States)

    Kinloch, Karen Elizabeth

    2013-01-01

    According to an extensive review of the literature, effective instructional delivery and "classroom management" practices are critical factors to elevate student achievement (Shindler, Jones, Williams, Taylor, & Cadenas, 2012). The purpose of this study was to analyze a comparison of classroom management practices on student…

  12. Pre-School Teachers' Classroom Management Competency and the Factors Affecting Their Understanding of Discipline

    Science.gov (United States)

    Buyuktaskapu Soydan, Sema; Alakoc, Pirpir; Ozturk Samur, Ayse; Angin, Duriye Esra

    2018-01-01

    Purpose: This research was carried out to determine the classroom management competency and the levels of perception of understanding of discipline among preschool teachers, the effect of their classroom management competency and understanding of discipline on child-teacher relationship, the relationship between interpersonal problem-solving and…

  13. Teachers' Facility with Evidence-Based Classroom Management Practices: An Investigation of Teachers' Preparation Programmes and In-Service Conditions

    Science.gov (United States)

    Ficarra, Laura; Quinn, Kevin

    2014-01-01

    In the present investigation, teachers' self-reported knowledge and competency ratings for the evidence-based classroom management practices were analysed. Teachers also reflected on how they learned evidence-based classroom management practices. Results suggest that teachers working in schools that implement Positive Behavioural Interventions and…

  14. Origin of the Species: An Epistemological Tale of Classroom Management Theory and the Evolution of a Teacher Preparation Course Syllabus

    Science.gov (United States)

    Hertel, Nichole L.

    2012-01-01

    This dissertation dually explores the topics of classroom management theory as it occurs in teacher preparation programs in American colleges of education and of curriculum syllabus design of undergraduate education classes teaching such. It begins with the classroom management and teaching pedagogical knowledges gained through my experience as a…

  15. The Relationship between Teachers' Implementation of Classroom Management Practices and Student Behavior in Elementary School

    Science.gov (United States)

    Gage, Nicholas A.; Scott, Terrance; Hirn, Regina; MacSuga-Gage, Ashley S.

    2018-01-01

    Teachers' classroom management practices have a direct impact on their students' probability of success. Evidence-based classroom management practices include (a) active instruction and supervision of students (i.e., teaching), (b) opportunities for students to respond, and (c) feedback to students. In this study, we examined the degree to which…

  16. Load prediction of stall regulated wind turbines

    Energy Technology Data Exchange (ETDEWEB)

    Bjoerck, A.; Dahlberg, J.Aa. [Aeronautical Research Inst. of Sweden, Bromma (Sweden); Carlen, I. [Chalmers Univ. of Technology, Goeteborg (Sweden). Div. of Marine Structural Engineering; Ganander, H. [Teknikgruppen AB, Sollentua (Sweden)

    1996-12-01

    Measurements of blade loads on a turbine situated in a small wind farm shows that the highest blade loads occur during operation close to the peak power i.e. when the turbine operates in the stall region. In this study the extensive experimental data base has been utilised to compare loads in selected campaigns with corresponding load predictions. The predictions are based on time domain simulations of the wind turbine structure, performed by the aeroelastic code VIDYN. In the calculations a model were adopted in order to include the effects of dynamic stall. This paper describes the work carried out so far within the project and key results. 5 refs, 10 figs

  17. Dynamic stall and 3D effects

    Energy Technology Data Exchange (ETDEWEB)

    Bjoerck, A.; Thor, S.E. [Aeronautical Research Inst. of Sweden, Bromma (Sweden)

    1996-12-01

    The JOULE II project `Dynamic stall and 3D effects` started in January 1994 and was completed in September 1995. The objective of the project has been to increase the understanding of the three-dimensional and unsteady aerodynamics of stall controlled HAWT`s. The objectives have also been to develop `engineering models` suitable for inclusion into aero-elastic codes. The project included the participation of 13 parties within Europe. This paper describes an overview of the work carried out within the project and key results. 3 refs, 4 figs

  18. Education stalls and subsequent stalls in African fertility: A descriptive overview

    Directory of Open Access Journals (Sweden)

    Anne Goujon

    2015-12-01

    Full Text Available Background: Recent stalls in fertility decline have been observed in a few countries in sub-Saharan Africa, and so far no plausible common reason has been identified in the literature. This paper develops the hypothesis that these fertility stalls could be associated with stalls in the progress of education among the women of the relevant cohorts, possibly resulting partly from the Structural Adjustment Programs (SAPs of the 1980s. Methods: We descriptively link the change in the education composition of successive cohorts of young women in sub-Saharan Africa and the recent fertility stalls. We use reconstructed data on population by age, gender, and level of education from www.wittgenstein centre.org/dataexplorer, and fertility rates from the United Nations. Results: In most sub-Saharan African countries, we observe that the same countries that had fertility stalls had a stall in the progress of education, particularly for young women who were of primary school age during the 1980s, when most of the countries were under structural adjustment. Conversely, stalls in fertility are less common in countries that did not have an education stall, possibly in relation to SAPs. Conclusions: The results point to the possibility of a link between the recent fertility stalls and discontinuities in the improvement of the education of the relevant cohorts, which in turn could be related to the SAPs in the 1980s. This descriptive finding now needs to be corroborated through more detailed cohort-specific fertility analysis. If the education-fertility link can be further established, it will have important implications for the projections of population growth in affected countries.

  19. Classroom management at the university level: lessons from a former high school earth science teacher

    Science.gov (United States)

    Lazar, C.

    2009-12-01

    Just a few days before my career as a fledgling science teacher began in a large public high school in New York City, a mentor suggested I might get some ideas about how to run a classroom from a book called The First Days Of School by Harry Wong. Although the book seemed to concentrate more on elementary students, I found that many of the principles in the book worked well for high school students. Even as I have begun to teach at the university level, many of Wong’s themes have persisted in my teaching style. Wong’s central thesis is that for learning to occur, a teacher must create the proper environment. In education jargon, a good climate for learning is generated via classroom management, an array of methods used by elementary and secondary school teachers to provide structure and routine to a class period via a seamless flow of complementary activities. Many college professors would likely consider classroom management to be chiefly a set of rules to maintain discipline and order among an otherwise unruly herd of schoolchildren, and therefore not a useful concept for mature university students. However, classroom management is much deeper than mere rules for behavior; it is an approach to instructional design that considers the classroom experience holistically. A typical professorial management style is to lecture for an hour or so and ask students to demonstrate learning via examinations several times in a semester. In contrast, a good high school teacher will manage a class from bell-to-bell to create a natural order and flow to a given lesson. In this presentation, I will argue for an approach to college lesson design similar to the classroom management style commonly employed by high school and elementary school teachers. I will suggest some simple, practical techniques learned during my high school experience that work just as well in college: warm-up and practice problems, time management, group activities, bulletin boards, learning environment

  20. Calculation of Rotor Performance and Loads Under Stalled Conditions

    National Research Council Canada - National Science Library

    Yeo, Hyeonsoo

    2003-01-01

    Rotor behavior in stalled conditions is investigated using wind tunnel test data of a 1/10-scale CH-47B/C type rotor, which provides a set of test conditions extending from unstalled to light stall...

  1. Teaching Supply Chain Management Complexities: A SCOR Model Based Classroom Simulation

    Science.gov (United States)

    Webb, G. Scott; Thomas, Stephanie P.; Liao-Troth, Sara

    2014-01-01

    The SCOR (Supply Chain Operations Reference) Model Supply Chain Classroom Simulation is an in-class experiential learning activity that helps students develop a holistic understanding of the processes and challenges of supply chain management. The simulation has broader learning objectives than other supply chain related activities such as the…

  2. · Attitude towards Computers and Classroom Management of Language School Teachers

    Directory of Open Access Journals (Sweden)

    Sara Jalali

    2014-07-01

    Full Text Available Computer-assisted language learning (CALL is the realization of computers in schools and universities which has potentially enhanced the language learning experience inside the classrooms. The integration of the technologies into the classroom demands that the teachers adopt a number of classroom management procedures to maintain a more learner-centered and conducive language learning environment. The current study explored the relationship between computer attitudes and behavior and instructional classroom management approaches implemented by English institute teachers. In so doing, a total of 105 male (n = 27 and female (n = 78 EFL teachers participated in this study. A computer attitude questionnaire adapted from Albirini (2006 and a Behavior and Instructional Management Scale (BIMS adopted from Martin and Sass (2010 were benefitted from for the purpose of collecting the data. The results of the Pearson Correlation Coefficient revealed that there were no significant relationships between attitude and behavior and instructional management across gender. However, it was found that the more male teachers experience tendency toward using computers in their classes, the more teacher-centered their classes become. In addition, the more female teachers are prone to use computers in their classes, the more student-centered and lenient their classes become.

  3. Measuring Teachers' Interpersonal Self-Efficacy: Relationship with Realized Interpersonal Aspirations, Classroom Management Efficacy and Age

    Science.gov (United States)

    Veldman, Ietje; Admiraal, Wilfried; Mainhard, Tim; Wubbels, Theo; van Tartwijk, Jan

    2017-01-01

    In this study, we present the development and validation of an instrument for measuring teachers' interpersonal self-efficacy: the Questionnaire on Teacher Interaction-Self-Efficacy (QTI-SE). We used the Questionnaire on Teacher Interaction as a basis to construct items. Current scales on teacher self-efficacy in classroom management cover…

  4. Teacher Perceptions of the Impact of Self-Efficacy on Classroom Management Style: A Case Study

    Science.gov (United States)

    McCain, Patty Jo

    2017-01-01

    The purpose of this qualitative case study was to develop an understanding of how current and former middle school teachers in a suburban school district in northeast Georgia perceive low self-efficacy impacts their classroom management style. The theory guiding this study was Bandura's (1977) self-efficacy theory as it supported the idea that…

  5. Using Simulation to Support Novice Teachers' Classroom Management Skills: Comparing Traditional and Alternative Certification Groups

    Science.gov (United States)

    Pankowski, Jennifer; Walker, Joan T.

    2016-01-01

    Drawing from research on situated cognition and the development of expertise and simulations in professional education, we designed two simulation tasks that provided novice teachers with repeated opportunities to deliberately practice managing a classroom under no-fault conditions. The simulations immersed novices in two perennial classroom…

  6. Rural High School Teachers' Self-Efficacy in Student Engagement, Instructional Strategies, and Classroom Management

    Science.gov (United States)

    Shoulders, Tori L.; Krei, Melinda Scott

    2015-01-01

    The purpose of this study was to compare the differences in rural high school teachers' (n = 256) self-efficacy in student engagement, instructional practices, and classroom management using selected teacher characteristics. Analysis of variance showed significant mean differences between different levels of education in self-efficacy for…

  7. The Relationship between Teachers' Democratic Classroom Management Attitudes and Students' Critical Thinking Dispositions

    Science.gov (United States)

    Turabik, Tugba; Gün, Feyza

    2016-01-01

    This study aimed to investigate the relationship between democratic classroom management attitudes of teachers and critical thinking dispositions of students. The study group consisted of 530 students from public high schools located in Altindag district of the province of Ankara. The data was collected with the use of "Democratic Classroom…

  8. Relationships between Instructional Quality and Classroom Management for Beginning Urban Teachers

    Science.gov (United States)

    Kwok, Andrew

    2017-01-01

    This mixed-methods study explores the differences in 1st-year urban teachers' classroom management beliefs and actions. The teachers in this study were in their first year of teaching in an urban context concurrent with their participation in a teacher education program offered at a large public university. Using program-wide surveys of 89…

  9. Examining Preschool and First Grade Teachers' Opinions on the Effects of School Readiness to Classroom Management

    Science.gov (United States)

    Akman, Berrin; Kükürtcü, Sevi Kent; Tarman, Ilknur; Sanli, Zeynep Seda

    2017-01-01

    The purpose of this research is to examine preschool and first grade teachers' opinions on the effects of school readiness to classroom management. The participants of this research consisted of the 18 preschool and 22 first grade teachers who work at public and private schools in the cities of Konya, Ankara and Kayseri in Turkey. Phenomenological…

  10. Science Technology and Engineering Teachers' Emotional Intelligence vis-à-vis Classroom Management

    Science.gov (United States)

    Llego, Jordan Hiso

    2017-01-01

    This study aimed to determine the relationship of emotional intelligence of science STE teachers' with their classroom management. This study used descriptive-correlational using survey questionnaire with total population sampling who are offering Science, Technology and Engineering curriculum in Region 1, Philippines with 113 respondents.…

  11. The Film as Visual Aided Learning Tool in Classroom Management Course

    Science.gov (United States)

    Altinay Gazi, Zehra; Altinay Aksal, Fahriye

    2011-01-01

    This research aims to investigate the impact of the visual aided learning on pre-service teachers' co-construction of subject matter knowledge in teaching practice. The study revealed the examination of film as an active cognizing and learning tool in classroom management course within teacher education programme. Within the framework of action…

  12. Coping Styles with Student Misbehavior as Mediators of Teachers' Classroom Management Strategies

    Science.gov (United States)

    Tran, Van Dat

    2016-01-01

    The purpose of the present study is to identify how teachers' use of various coping styles with student misbehavior, and the extent to which these relate to their classroom management techniques -- punishment, recognition and reward, hinting, discussion, and aggression. It examines data from 397 junior high school teachers in Vietnam. The results…

  13. Behavior and Classroom Management: Are Teacher Preparation Programs Really Preparing Our Teachers?

    Science.gov (United States)

    Flower, Andrea; McKenna, John William; Haring, Christa D.

    2017-01-01

    Research suggests that many teachers are underprepared for the behaviors that their students may bring to the classroom, resulting in challenges to teaching and learning. The purpose of this study was to examine the behavior management content included in preservice teacher preparation programs for general education and special education teachers.…

  14. Inviting the Muse into the Classroom: Poetic License in Management Education

    Science.gov (United States)

    Van Buskirk, William; London, Michael

    2008-01-01

    Instructors are responsible for making teaching come to life. This article seeks to energize the classroom through an exploration of the tacit synergies between the language of poetry and the language of management. In the process, the authors delve into both the opportunities and the obstacles in bringing together two disparate discourses. As an…

  15. Complementary Roles of Care and Behavioral Control in Classroom Management: The Self-Determination Theory Perspective

    Science.gov (United States)

    Nie, Youyan; Lau, Shun

    2009-01-01

    This study examined how classroom management practices--care and behavioral control--were differentially associated with students' engagement, misbehavior, and satisfaction with school, using a large representative sample of 3196 Grade 9 students from 117 classes in Singapore. Results of hierarchical linear modeling showed differential relations.…

  16. The Special Educator's Toolkit: Everything You Need to Organize, Manage, and Monitor Your Classroom

    Science.gov (United States)

    Golden, Cindy

    2012-01-01

    Overwhelmed special educators: Reduce your stress and support student success with this practical toolkit for whole-classroom organization. A lifesaver for special educators in any K-12 setting, this book-and-CD set will help teachers expertly manage everything, from schedules and paperwork to student supports and behavior plans. Cindy Golden, a…

  17. Classroom Management Competencies of Intern-Teachers in Nigeria Secondary Schools

    Science.gov (United States)

    Ikoya, Peter Onotevure; Akinseinde, Samuel I.

    2010-01-01

    The purpose of the study was to find out the adequacy of the current classroom management training program for intern teachers in Nigerian Universities. Two hundred and six respondents were used for the study. A structured questionnaire was administered to seventy males and one hundred and thirty-six females drawn from Arts, Science, Technical and…

  18. Does teachers’ classroom management quality change over time and does it affect students’ academic engagement?

    NARCIS (Netherlands)

    Opdenakker, Marie-Christine J.; Maulana, Ridwan

    2015-01-01

    The way teachers behave towards and interact with their students influences the quality of their support/relationships with their students and the quality of their student behaviour management. Nowadays, this is broadly conceptualised as ‘classroom management’ (CM) aimed at, among others, student

  19. Differences between experienced and student teachers’perceptions and interpretations of classroom management events

    NARCIS (Netherlands)

    Wolff, Charlotte; Van den Bogert, Niek; Jarodzka, Halszka; Boshuizen, Els

    2013-01-01

    Wolff, C., Van den Bogert, N., Jarodzka, H., & Boshuizen, H. P. A. (2012, November). Differences between experienced and student teachers’perceptions and interpretations of classroom management events. Presented at the Inter-university Center for Educational Sciences Fall School, Girona, Spain.

  20. Keeping an Eye on Learning: Differences between Expert and Novice Teachers' Representations of Classroom Management Events

    Science.gov (United States)

    Wolff, Charlotte E.; van den Bogert, Niek; Jarodzka, Halszka; Boshuizen, Henny P. A.

    2015-01-01

    Classroom management represents an important skill and knowledge set for achieving student learning gains, but poses a considerable challenge for beginning teachers. Understanding how teachers' cognition and conceptualizations differ between experts and novices is useful for enhancing beginning teachers' expertise development. We created a coding…

  1. Principles of Classroom Management: A Professional Decision-Making Model, 7th Edition

    Science.gov (United States)

    Levin, James; Nolan, James F.

    2014-01-01

    This text takes a decision-making model approach to classroom management. It provides teachers with a very practical system to influence students to choose to behave productively and to strive for academic success. This widely used text presents an array of decision-making options that guide teachers in developing positive, pro-social classroom…

  2. Examining Preservice Teachers' Classroom Management Decisions in Three Case-Based Teaching Approaches

    Science.gov (United States)

    Cevik, Yasemin Demiraslan; Andre, Thomas

    2013-01-01

    This study was aimed at comparing the impact of three types of case-based approaches (worked example, faded work example, and case-based reasoning) on preservice teachers' decision making and reasoning skills related to realistic classroom management situations. Participants in this study received a short-term implementation of one of these three…

  3. Airfoil stall interpreted through linear stability analysis

    Science.gov (United States)

    Busquet, Denis; Juniper, Matthew; Richez, Francois; Marquet, Olivier; Sipp, Denis

    2017-11-01

    Although airfoil stall has been widely investigated, the origin of this phenomenon, which manifests as a sudden drop of lift, is still not clearly understood. In the specific case of static stall, multiple steady solutions have been identified experimentally and numerically around the stall angle. We are interested here in investigating the stability of these steady solutions so as to first model and then control the dynamics. The study is performed on a 2D helicopter blade airfoil OA209 at low Mach number, M 0.2 and high Reynolds number, Re 1.8 ×106 . Steady RANS computation using a Spalart-Allmaras model is coupled with continuation methods (pseudo-arclength and Newton's method) to obtain steady states for several angles of incidence. The results show one upper branch (high lift), one lower branch (low lift) connected by a middle branch, characterizing an hysteresis phenomenon. A linear stability analysis performed around these equilibrium states highlights a mode responsible for stall, which starts with a low frequency oscillation. A bifurcation scenario is deduced from the behaviour of this mode. To shed light on the nonlinear behavior, a low order nonlinear model is created with the same linear stability behavior as that observed for that airfoil.

  4. 16 CFR 1505.50 - Stalled motor testing.

    Science.gov (United States)

    2010-01-01

    ... 16 Commercial Practices 2 2010-01-01 2010-01-01 false Stalled motor testing. 1505.50 Section 1505... USE BY CHILDREN Policies and Interpretations § 1505.50 Stalled motor testing. (a) § 1505.6(e)(4)(ii) requires that a motor-operated toy be tested with the motor stalled if the construction of the toy is such...

  5. Teaching Management and Implementation of Pedagogical Classroom Projects in Basic Education

    Directory of Open Access Journals (Sweden)

    Waldemar Antonio Guerrero Matos

    2006-11-01

    Full Text Available The present article diffuses the results of the oriented study to determine the relationship between the administration of the educational one and the execution of the pedagogic projects of classroom in Basic Education. Theoretically it was based on the constructivismo and the contributions of the National Basic Curriculum. The investigation type was descriptive. The results allowed to corroborate in the teachers, weaknesses in the execution of the Pedagogic Projects of Classroom, evidencing difficulties to the moment to apply the pedagogic abilities. Therefore it is recommended to carry out courses of upgrade to manage with effectiveness this strategy of planning constructivist.

  6. A Thai Tale: School Business Management beyond the Classroom

    Science.gov (United States)

    Robinson, Ann

    2012-01-01

    The author is fairly familiar with the work dimensions of a business manager and has pretty much attended most of the professional development "how-to" sessions on everything from asset management to school budgets and beyond. When she thinks about what business managers do in schools and how much of what they do actually adds value, she…

  7. Teaching Styles of the Classroom Managers in one Basic Primary School in the Philippines

    Directory of Open Access Journals (Sweden)

    Marife G.Villena

    2015-05-01

    Full Text Available This study aimed to determine the teaching styles of the classroom managers in Pinamucan Elementary School. Specifically, it identified the demographic profile or the teachers respondents in terms of age, gender, educational qualification, number of seminars attended, assigned level and years of services; and find out which of the teaching styles of the teacher respondents in terms of whole class, individual, and small group activities are practiced. The study used descriptive methods were a standardized questionnaire was utilized as the main instrument in gathering data. Based on the result, Most of the classroom managers belonged to the middle aged bracket; had been working from 20 to 29 years in this institution, and were assigned in different grades / levels, and had attended 7-9 seminars for the length of time they had served there; majority of the respondents often use the question and answer method when doing whole class activities. For individual activities, homework is often used by the classroom managers to get their students’ attention while for small group activities, games were often practiced as means of initiating cooperation among students. The school may be practice the used of LCD. School administrator mat conduct seminars regarding modern classroom methodologies

  8. An online app platform enhances collaborative medical student group learning and classroom management.

    Science.gov (United States)

    Peacock, Justin G; Grande, Joseph P

    2016-01-01

    The authors presented their results in effectively using a free and widely-accessible online app platform to manage and teach a first-year pathology course at Mayo Medical School. The authors utilized the Google "Blogger", "Forms", "Flubaroo", "Sheets", "Docs", and "Slides" apps to effectively build a collaborative classroom teaching and management system. Students were surveyed on the use of the app platform in the classroom, and 44 (94%) students responded. Thirty-two (73%) of the students reported that "Blogger" was an effective place for online discussion of pathology topics and questions. 43 (98%) of the students reported that the "Forms/Flubaroo" grade-reporting system was helpful. 40 (91%) of the students used the remote, collaborative features of "Slides" to create team-based learning presentations, and 39 (89%) of the students found those collaborative features helpful. "Docs" helped teaching assistants to collaboratively create study guides or grading rubrics. Overall, 41 (93%) of the students found that the app platform was helpful in establishing a collaborative, online classroom environment. The online app platform allowed faculty to build an efficient and effective classroom teaching and management system. The ease of accessibility and opportunity for collaboration allowed for collaborative learning, grading, and teaching.

  9. Simulation model of an active stall wind turbine controller

    Energy Technology Data Exchange (ETDEWEB)

    Jauch, C.; Hansen, A.D.; Soerensen, P. [Risoe National Lab., Wind Energy Dept., Rosilde (Denmark); Blaabjerg, F. [Aalborg Univ., Inst. of Energy Technology (Denmark)

    2004-07-01

    This paper describes an active stall wind turbine controller. The objective is to develop a general model of an active stall controller in order to simulate the operation of grid connected active stall wind turbines. The active stall turbine concept and its control strategies are presented and evaluated on the basis of simulations. The presented controller is described for continuous operation under all wind speeds from start-up wind speed to shut doven wind speed. Due to its parametric implementation it is general i.e. it can represent different active stall wind turbine controllers and can be implemented in different simulation tools. (au)

  10. Development and Construct Validation of a Situational Judgment Test of Strategic Knowledge of Classroom Management in Elementary Schools

    Science.gov (United States)

    Gold, Bernadette; Holodynski, Manfred

    2015-01-01

    The current study describes the development and construct validation of a situational judgment test for assessing the strategic knowledge of classroom management in elementary schools. Classroom scenarios and accompanying courses of action were constructed, of which 17 experts confirmed the content validity. A pilot study and a cross-validation…

  11. Comparing Beginning and Experienced Teachers' Perceptions of Classroom Management Beliefs and Practices in Elementary Schools in Turkey

    Science.gov (United States)

    Unal, Zafer; Unal, Aslihan

    2009-01-01

    The primary objective of this study was to investigate whether a difference in teachers' classroom management styles exists based on years of teaching experience. Data were collected from 282 elementary school teachers employed by 11 elementary schools in Turkey. The Attitudes and Beliefs on Classroom Control Inventory was used to collect the…

  12. Code Switching in the Classroom: A Case Study of Economics and Management Students at the University of Sfax, Tunisia

    Science.gov (United States)

    Bach Baoueb, Sallouha Lamia; Toumi, Naouel

    2012-01-01

    This case study explores the motivations for code switching (CS) in the interactions of Tunisian students at the faculty of Economics and Management in Sfax, Tunisia. The study focuses on students' (EMSs) classroom conversations and out-of-classroom peer interactions. The analysis of the social motivations of EMSs' CS behaviour shows that…

  13. Flipping the Classroom Applications to Curriculum Redesign for an Introduction to Management Course: Impact on Grades

    Science.gov (United States)

    Albert, Michael; Beatty, Brian J.

    2014-01-01

    The authors discuss the application of the flipped classroom model to the redesign of an introduction to management course at a highly diverse, urban, Association to Advance Collegiate Schools of Business-accredited U.S. university. The author assessed the impact of a flipped classroom versus a lecture class on grades. Compared to the prior…

  14. Value driven classroom management-the congruence between the preferred and the democratic values

    Directory of Open Access Journals (Sweden)

    Fatma Özmen

    2013-11-01

    Full Text Available The rapid changes in all areas of communities have raised the level of concerns about weakening of the societal values. And many academics and researchers have begun to become interested in the issues for placing especially the democratic values in education more than ever before, in order to constitute more livable social environments. The goal of this study is, on the basis of gender variable, to determine what values have driven the teachers in their classroom management practices, and to find out if these values are congruent with the democratic principles. The research group comprises 68 teachers working in Regional Public Boarding Schools. The teachers were asked to list the most and the least preferred values in classroom management from a predetermined value list. The analysis of the data revealed that the most desired 10 values used by teachers in classroom management practices were generally common between female and male gender groups and both groups’ preferences indicated similar results. ‘Honesty’ and ‘responsibility’ take at the top of the most preferred value list. However, the value of ‘equality’ which is indispensible for maintaining democracyin classroom, was preferred by less than half of the teachers. And the values such as peace, freedom, social recognition and the like were not given place in the most preferred value list. The least preferred ten values were generally the ones which were not directly related to democracy. These results indicate that some essential values related to democracy are not given much importance. It is recommended that teachers should be trained well about creating democratic classroom settings especially in pre-service education. And, school leaders should give utmost importance to constitute a democratic school environment; and school wide practices should be congruent with democratic principles so as to form it as a life style.

  15. Numerical Investigations of Dynamic Stall Control

    Directory of Open Access Journals (Sweden)

    Florin FRUNZULICA

    2014-04-01

    Full Text Available In this paper we investigated numerically the dynamic stall phenomenon and the possibilities to control it, with application to vertical axis wind turbines (for urban users. The Phenomenon appear at low tip speed ratio (TSR<4 and it has a great impact on structural integrity of the wind turbine and power performances. For this reason we performed a computational study of dynamic stall around NACA 0012 airfoil in pitching motion at relative low Reynolds number (105. Also, we performed the same analysis for four flow control methods: two passive (Gurney flap and slot and two active (blowing jet on the rounded trailing edge and synthetic jet periodically activated. The Results are compared to those of an existing experimental case test.

  16. A randomized controlled trial of the impact of a teacher classroom management program on the classroom behavior of children with and without behavior problems.

    Science.gov (United States)

    Hutchings, Judy; Martin-Forbes, Pam; Daley, David; Williams, Margiad Elen

    2013-10-01

    This randomized controlled trial (RCT) evaluated the efficacy of the Incredible Years (IY) Teacher Classroom Management (TCM; Webster-Stratton & Reid, 2002) program to assess whether training teachers in IY-TCM principles improve teacher behavior, whether any observed improvements impact pupil behavior classroom-wide, and whether these effects can be demonstrated with children at risk of developing conduct problems. Six intervention and six control classrooms comprising 12 teachers and 107 children (aged 3 to 7years) were recruited. Children were screened for high or low behavior problems using the cut-off points of the teacher-rated Strengths and Difficulties Questionnaire (Goodman, 1997). The primary outcome measure was independent classroom observations using the Teacher-Pupil Observation Tool (Martin et al., 2010). Multilevel modeling analyses were conducted to examine the effect of the intervention on teacher, classroom, and child behavior. Results showed a significant reduction in classroom off-task behavior (d=0.53), teacher negatives to target children (d=0.36), target child negatives towards the teacher (d=0.42), and target child off-task behavior (d=0.48). These preliminary results demonstrate the potential impact of IY-TCM on both teacher and child behavior. Copyright © 2013 Society for the Study of School Psychology. Published by Elsevier Ltd. All rights reserved.

  17. Dynamic Stall Control Using Plasma Actuators

    Science.gov (United States)

    Webb, Nathan; Singhal, Achal; Castaneda, David; Samimy, Mo

    2017-11-01

    Dynamic stall occurs in many applications, including sharp maneuvers of fixed wing aircraft, wind turbines, and rotorcraft and produces large unsteady aerodynamic loads that can lead to flutter and mechanical failure. This work uses flow control to reduce the unsteady loads by excitation of instabilities in the shear layer over the separated region using nanosecond pulse driven dielectric barrier discharge (NS-DBD) plasma actuators. These actuators have been shown to effectively delay or mitigate static stall. A wide range of flow parameters were explored in the current work: Reynolds number (Re = 167,000 to 500,000), reduced frequency (k = 0.025 to 0.075), and excitation Strouhal number (Ste = 0 to 10). Based on the results, three major conclusions were drawn: (a) Low Strouhal number excitation (Ste eliminated the dynamic stall vortex (DSV), thereby dramatically reducing the unsteady loading. The decrease in the strength of the DSV is achieved by the formation of shear layer coherent structures that bleed the leading-edge vorticity prior to the ejection of the DSV.

  18. Ingestive behavior of lambs confined in individual and group stalls.

    Science.gov (United States)

    Filho, A Eustáquio; Carvalho, G G P; Pires, A J V; Silva, R R; Santos, P E F; Murta, R M; Pereira, F M

    2014-02-01

    The experiment was conducted to evaluate the ingestive behavior of lambs confined in individual and group stalls. We used thirty-four lambs in their growing phase, aged an average of three months, with mean initial live weight of 17.8±5.2 kg. They were allotted in a completely randomized design with 24 animals kept in individual stalls and 10 animals confined as a group. The experiment lasted for a total of 74 days, and the first 14 days were dedicated to the animals' adaption to the management, facilities and diets. The data collection period lasted 60 days, divided into three 20-d periods for the behavior evaluation. The animals were subjected to five days of visual observation during the experiment period, by the quantification of 24 h a day, with evaluations on the 15th day of each period and an interim evaluation consisting of two consecutive days on the 30th and 31st day of the experiment. The animals confined as a group consumed less (pbehavior.

  19. The Relation of Work Environment and Stress in Classroom Management among Preschool Teachers

    Directory of Open Access Journals (Sweden)

    Abdul Said Ambotang

    2011-10-01

    Full Text Available The purpose of this research is to observe how far preschool teachers endure stress in carrying out their job which is influenced by the work climate including the management of classroom. This research is carried out by choosing a group of 55 preschool teachers as respondents in the district of Keningau Sabah. Data is analyzed using descriptive method (mean, inferential (T-test Statistic, one way ANOVA and Pearson correlation. Result showed that there were high positive relationships between the work climate with stress level among the teachers. (r = 0.807, p<0.01 and classroom management with level of stress (r = 0.770, p< 0.01. It is hoped that with the information obtained by this research will assist the Malaysian Ministry of Education in planning and designing a suitable programme to overcome the stress problem faced by teachers especially preschool teachers towards improving the teaching profession quality in the near future.

  20. Illustrating the multiple facets and levels of fidelity of implementation to a teacher classroom management intervention.

    Science.gov (United States)

    Reinke, Wendy M; Herman, Keith C; Stormont, Melissa; Newcomer, Lori; David, Kimberly

    2013-11-01

    Many school-based interventions to promote student mental health rely on teachers as implementers. Thus, understanding the interplay between the multiple domains of fidelity to the intervention and intervention support systems such as coaching and teacher implementation of new skills is an important aspect of implementation science. This study describes a systematic process for assessing multiple domains of fidelity. Data from a larger efficacy trial of the Incredible Years Teacher Classroom Management (IY TCM) program are utilized. Data on fidelity to the IY TCM workshop training sessions and onsite weekly coaching indicate that workshop leaders and the IY TCM coach implemented the training and coaching model with adequate adherence. Further, workshop leaders' ratings of engagement were associated with teacher implementation of specific praise, following training on this content. Lastly, the IY TCM coach differentiation of teacher exposure to coaching was evaluated and found to be associated with teacher implementation of classroom management practices and student disruptive behavior.

  1. Designing English-Medium Classroom Management Course for Non-Natives

    Directory of Open Access Journals (Sweden)

    Tuba Gokmenoglu

    2013-03-01

    Full Text Available This qualitative phenomenological research study explores the practices of instructors teaching through the medium of English as a foreign language, in classroom management course. Data collection instruments are semi-structured interviews and the course syllabi. Phenomenological data analysis techniques (bracketing, determining themes were employed. Results indicate that instructors do not use a specific model for the classroom management course. The challenges faced with design of an English-medium instruction such as difficulty in finding cultural course materials, lack of confidence among local students, adaptation of international students and the solutions (dividing the course into two parts: theory and practice; sharing own experiences; using tentative course syllabus of instructors for these challenges were explored, and suggestions for the designers of English-medium courses were discussed

  2. Do United States' teachers know and adhere to the national guidelines on asthma management in the classroom? A systematic review.

    Science.gov (United States)

    Jaramillo, Yudilyn; Reznik, Marina

    2015-01-01

    Proper asthma management in schools is important in achieving optimum asthma control in children with asthma. The National Heart, Lung, and Blood Institute (NHLBI) has developed guidelines on classroom asthma management. We conducted a systematic review to examine teacher knowledge of the NHLBI guidelines on asthma management in the classroom. We searched PubMed and EMBASE using search terms "asthma management," "teacher(s)," "school teacher," and "public school." The inclusion criteria were articles published in English from 1994 to May 2014 that focus on schools in the United States (US). From 535 titles and abstracts, 9 studies met inclusion criteria. All studies reported that school teachers did not know the policies and procedures of asthma management. Teachers relied on school nurses to handle medical emergencies. Some studies identified that lack of full-time school nurses was a barrier to asthma management. Only one study showed directly that classroom teachers were not following the NHLBI guidelines on asthma management. Our literature review revealed that US teachers do not know the NHLBI guidelines on asthma management in the classroom. Future research should focus on interventions targeted toward training classroom teachers on asthma management as per NHLBI guidelines to ultimately improve asthma management in schools.

  3. Do United States’ Teachers Know and Adhere to the National Guidelines on Asthma Management in the Classroom? A Systematic Review

    Directory of Open Access Journals (Sweden)

    Yudilyn Jaramillo

    2015-01-01

    Full Text Available Proper asthma management in schools is important in achieving optimum asthma control in children with asthma. The National Heart, Lung, and Blood Institute (NHLBI has developed guidelines on classroom asthma management. We conducted a systematic review to examine teacher knowledge of the NHLBI guidelines on asthma management in the classroom. We searched PubMed and EMBASE using search terms “asthma management,” “teacher(s,” “school teacher,” and “public school.” The inclusion criteria were articles published in English from 1994 to May 2014 that focus on schools in the United States (US. From 535 titles and abstracts, 9 studies met inclusion criteria. All studies reported that school teachers did not know the policies and procedures of asthma management. Teachers relied on school nurses to handle medical emergencies. Some studies identified that lack of full-time school nurses was a barrier to asthma management. Only one study showed directly that classroom teachers were not following the NHLBI guidelines on asthma management. Our literature review revealed that US teachers do not know the NHLBI guidelines on asthma management in the classroom. Future research should focus on interventions targeted toward training classroom teachers on asthma management as per NHLBI guidelines to ultimately improve asthma management in schools.

  4. Managing Children's Fears and Anxieties in Classroom Settings.

    Science.gov (United States)

    Akande, A.; Osagie, J. E.; Mwaiteleke, P. B.; Botha, K. F. H.; Ababio, E. P.; Selepe, T. J.; Chipeta, K.

    1999-01-01

    Explores fears and phobias of childhood from a behavioral perspective. Maintains that many childhood fears are mild, age-specific, and transitory, whereas others persist beyond normal developmental limits. Maintains that severe school phobia is difficult to manage. Notes that reports of successful behavioral treatments of fears/phobias are rare in…

  5. Effect of summer grazing on welfare of dairy cows reared in mountain tie-stall barns

    Directory of Open Access Journals (Sweden)

    Simonetta Dovier

    2010-09-01

    Full Text Available Traditional mountain farms have an important economic, social and environmental role. The Alps management system for dairy cows consists of animals kept indoors from autumn to spring, mostly in tie-stalls, and moved to mountain pasture in summer. The aim of our study was to assess the effect of mountain summer grazing on the welfare of dairy cows housed in tie-stall barns. Twenty-four farms were considered. In twelve of them, animals were reared in tie-stalls and moved to mountain pasture for three months in summer; they were visited three times: (i four weeks before grazing during the indoor period in the stall; (ii about three weeks after the start of grazing; and (iii in the stall, in autumn, at least three weeks after returning from grazing. The other twelve farms kept the animals in tie-stalls all year; they were visited once in autumn. Data were collected following a protocol that considers animal-based measures and structure information on the basis of Quality Welfare Consortium® indications. Data allowed the calculation of both the Animal Needs Index score (ANI 35L and an overall assessment of the cows’ welfare obtained from three general aspects: housing, animal’s physical condition, and animal’s behaviour. Summer grazing had a significant positive effect on injuries, lameness and animal’s rising duration but a negative effect on faeces consistency. Moreover, a reduction of tongue playing was observed. The ANI 35L and the overall assessment did not show significant differences linked to summer grazing, which tended to have a positive but temporary effect on animal behaviour.

  6. Managing Student Behavior in Dual Immersion Classrooms: A Study of Class-Wide Function-Related Intervention Teams.

    Science.gov (United States)

    Hansen, Blake D; Caldarella, Paul; Williams, Leslie; Wills, Howard P

    2017-09-01

    Classroom management in dual immersion classrooms includes unique challenges. The teacher must instruct and correct in the L2 language, in which students are beginning learners, and effective classroom management strategies appropriate to the L2 context. Class-Wide Function-Related Intervention Teams (CW-FIT) is a positive classroom management program that teaches social skills and uses group contingencies to improve behavior. The present study examined the ability of French immersion teachers to implement CW-FIT in the L2, including the effects of CW-FIT on teacher praise and reprimand rates and as well as on students' classroom behavior. Social validity was also assessed. A single-subject multiple baseline design with embedded reversals was used to evaluate impact in second-, third-, and fourth-grade dual immersion classrooms. Results indicated that dual immersion teachers were able to implement CW-FIT in L2 with fidelity. The intervention significantly increased teacher praise and improved classroom on-task behavior. Changes in teacher reprimand rates were inconsistent. Students and teachers reported CW-FIT to be socially valid.

  7. THE IMPACT OF YEARS OF TEACHING EXPERIENCE ON THE CLASSROOM MANAGEMENT APPROACHES OF ELEMENTARY SCHOOL TEACHERS

    Directory of Open Access Journals (Sweden)

    Zafer Ünal

    2012-07-01

    Full Text Available This study provided a basis for answering the following essential question: Does the years of experience affect teachers' classroom management approaches? Data were collected from 268 primary school teachers. The findings of this study demonstrated that experienced teachers are more likely to prefer to be in control in their classrooms than beginning teachers while interacting with students when making decisions. Investigating the previous studies, researchers were able to discover that there is certain path teachers follow through their career. While preservice teachers prefer non-interventionism (minimum teacher control, they support interactionism (shared control during internship and early career years, and finally they prefer to choose complete teacher control when they become experienced teachers.

  8. Preschool Education and Primary School Pre-service Teachers’ Perceptions about Classroom Management: A Metaphorical Analysis

    Directory of Open Access Journals (Sweden)

    Hatice Uysal

    2014-07-01

    Full Text Available The aim of the research was to determine the perceptions of preschool and primary school teachers about classroom management by means of metaphors. The sample which selected by the use of convenience sampling techniques was drawn from preschool and primary school undergraduate students who had taken the “Classroom Management” course in the 2012–2013 academic years. There has a total of 163 participants from two state universities in Turkey. The perceptions were obtained from the question “What does ‘classroom management’ seem to you?” and from the answers they explained by using the “because” conjunction. The content analysis technique was used to analyse the data. The answers of the participant pre-service teachers were categorized, and suggested that most of those categories were of positive perceptions except that a category included negative perceptions. The findings suggest that at the end of the study, across 10 different categories, preschool pre-service teachers developed 60 metaphors whereas primary school pre-service teacher developed 48 metaphors

  9. The Development of Training Package on Classroom Management of Preschool for Childcare Takers in Child Development Centre, Lampang Province

    Directory of Open Access Journals (Sweden)

    Orathai Lao-alongkorn

    2017-09-01

    Full Text Available The purposes of this research were 1 to find the efficiency of the development of training package on classroom management of preschool 2 to study the development after using training package on classroom management of preschool for childcare takers in child development Centre 3 to study the contentment after using training package on classroom management of preschool. The target group comprised of 28 childcare takers who were from 11 child development Centers under Khelang Nakorn Municipality in Lampang. The experimental instruments were the development of training package on classroom management of preschool for childcare takers. The data collection instruments were classroom management test and contentment test. The data obtained were analyzed for mean, percentage and standard deviation The findings of this study were as follows: 1 the efficiency of training package was increased 80.00/83.88 which passed 80/80. 2 the scores of the target group after using training package were increased than the previous of using the training package. 3 the contentment of the target group were found at the good level.

  10. 14 CFR 23.201 - Wings level stall.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Wings level stall. 23.201 Section 23.201 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT AIRWORTHINESS.... Starting from a speed at least 10 knots above the stall speed, the elevator control must be pulled back so...

  11. 14 CFR 33.65 - Surge and stall characteristics.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Surge and stall characteristics. 33.65 Section 33.65 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION AIRCRAFT... stall characteristics. When the engine is operated in accordance with operating instructions required by...

  12. Mobile Health Based System for Managing and Maintaining Health Data in Classroom: Case Study

    Directory of Open Access Journals (Sweden)

    Dalibor Serafimovski

    2017-05-01

    Full Text Available It is necessary for young people to get appropriate medical education so that they can learn how to properly take care of their health from an early age. In this paper we are presenting a study that enables practical implementation of a mobile system for monitoring students’ health using mobile devices and managing medical data in the classroom. About 600 students were engaged for the purpose of this study. The study results suggest that the application of these technologies leads to an increased concern about students’ health and their proper medical education.

  13. Educators' Self-Reported Training, Use, and Perceived Effectiveness of Evidence-Based Classroom Management Practices

    Science.gov (United States)

    Cooper, Justin T.; Gage, Nicholas A.; Alter, Peter J.; LaPolla, Stefanie; MacSuga-Gage, Ashley S.; Scott, Terrance M.

    2018-01-01

    A survey study of 248 educators in four states was conducted to identify respondents' formal training, use, and perceived effectiveness of 37 evidence-based classroom management practices within four general categories: (a) antecedent-based, (b) instructionally based, (c) consequence-based, and (d) self-management. Results indicated that, on…

  14. Theoretical analysis of transcription process with polymerase stalling

    Science.gov (United States)

    Li, Jingwei; Zhang, Yunxin

    2015-05-01

    Experimental evidence shows that in gene transcription RNA polymerase has the possibility to be stalled at a certain position of the transcription template. This may be due to the template damage or protein barriers. Once stalled, polymerase may backtrack along the template to the previous nucleotide to wait for the repair of the damaged site, simply bypass the barrier or damaged site and consequently synthesize an incorrect messenger RNA, or degrade and detach from the template. Thus, the effective transcription rate (the rate to synthesize correct product mRNA) and the transcription effectiveness (the ratio of the effective transcription rate to the effective transcription initiation rate) are both influenced by polymerase stalling events. So far, no theoretical model has been given to discuss the gene transcription process including polymerase stalling. In this study, based on the totally asymmetric simple exclusion process, the transcription process including polymerase stalling is analyzed theoretically. The dependence of the effective transcription rate, effective transcription initiation rate, and transcription effectiveness on the transcription initiation rate, termination rate, as well as the backtracking rate, bypass rate, and detachment (degradation) rate when stalling, are discussed in detail. The results showed that backtracking restart after polymerase stalling is an ideal mechanism to increase both the effective transcription rate and the transcription effectiveness. Without backtracking, detachment of stalled polymerase can also help to increase the effective transcription rate and transcription effectiveness. Generally, the increase of the bypass rate of the stalled polymerase will lead to the decrease of the effective transcription rate and transcription effectiveness. However, when both detachment rate and backtracking rate of the stalled polymerase vanish, the effective transcription rate may also be increased by the bypass mechanism.

  15. Breaking Bad Behaviours: A New Tool for Learning Classroom Management using Virtual Reality

    Directory of Open Access Journals (Sweden)

    Jean-Luc Lugrin

    2016-11-01

    Full Text Available This article presents an immersive Virtual Reality (VR system for training classroommanagement skills, with a specific focus on learning to manage disruptive student behaviourin face-to-face, one-to-many teaching scenarios. The core of the system is a real-time 3Dvirtual simulation of a classroom, populated by twenty-four semi-autonomous virtual students.The system has been designed as a companion tool for classroom management seminars ina syllabus for primary and secondary school teachers. Whereby, it will allow lecturers to linktheory with practice, using the medium of VR. The system is therefore designed for two users: atrainee teacher and an instructor supervising the training session. The teacher is immersed in areal-time 3D simulation of a classroom by means of a head-mounted display and headphone.The instructor operates a graphical desktop console which renders a view of the class and theteacher, whose avatar movements are captured by a marker-less tracking system. This consoleincludes a 2D graphics menu with convenient behaviour and feedback control mechanisms toprovide human-guided training sessions. The system is built using low-cost consumer hardwareand software. Its architecture and technical design are described in detail. A first evaluationconfirms its conformance to critical usability requirements (i.e., safety and comfort, believability,simplicity, acceptability, extensibility, affordability and mobility. Our initial results are promising,and constitute the necessary first step toward a possible investigation of the efficiency andeffectiveness of such a system in terms of learning outcomes and experience.

  16. A proactive classroom management model to enhance self-efficacy levels in teachers of adolescents who display disruptive behaviors.

    Science.gov (United States)

    Pace, Rolanda T; Boykins, Anita D; Davis, Sheila P

    2014-02-01

    The aims of this project were to determine teachers' self-efficacy levels at baseline and after participating in a proactive classroom management model intervention. Teachers (N = 26) were recruited from a rural middle school in a south central state. Data required for analysis were drawn from the Teachers' Sense of Efficacy Scale (long form). A statistically significant difference (t[25] = 7.68, p classroom management training for teachers as well as the need for psychiatric and mental health nurse consultants within the school system. Teacher classroom management strategies should also include appropriate response to individual student's needs, effective communication, and insight regarding the behaviors of students from diverse backgrounds. Copyright 2014, SLACK Incorporated.

  17. Does classroom-based Crew Resource Management training improve patient safety culture? A systematic review.

    Science.gov (United States)

    Verbeek-van Noord, Inge; de Bruijne, Martine C; Zwijnenberg, Nicolien C; Jansma, Elise P; van Dyck, Cathy; Wagner, Cordula

    2014-01-01

    To evaluate the evidence of the effectiveness of classroom-based Crew Resource Management training on safety culture by a systematic review of literature. Studies were identified in PubMed, Cochrane Library, PsycINFO, and Educational Resources Information Center up to 19 December 2012. The Methods Guide for Comparative Effectiveness Reviews was used to assess the risk of bias in the individual studies. In total, 22 manuscripts were included for review. Training settings, study designs, and evaluation methods varied widely. Most studies reporting only a selection of culture dimensions found mainly positive results, whereas studies reporting all safety culture dimensions of the particular survey found mixed results. On average, studies were at moderate risk of bias. Evidence of the effectiveness of Crew Resource Management training in health care on safety culture is scarce and the validity of most studies is limited. The results underline the necessity of more valid study designs, preferably using triangulation methods.

  18. Evaluating the Impact of Classroom Education on the Management of Septic Shock Using Human Patient Simulation.

    Science.gov (United States)

    Lighthall, Geoffrey K; Bahmani, Dona; Gaba, David

    2016-02-01

    Classroom lectures are the mainstay of imparting knowledge in a structured manner and have the additional goals of stimulating critical thinking, lifelong learning, and improvements in patient care. The impact of lectures on patient care is difficult to examine in critical care because of the heterogeneity in patient conditions and personnel as well as confounders such as time pressure, interruptions, fatigue, and nonstandardized observation methods. The critical care environment was recreated in a simulation laboratory using a high-fidelity mannequin simulator, where a mannequin simulator with a standardized script for septic shock was presented to trainees. The reproducibility of this patient and associated conditions allowed the evaluation of "clinical performance" in the management of septic shock. In a previous study, we developed and validated tools for the quantitative analysis of house staff managing septic shock simulations. In the present analysis, we examined whether measures of clinical performance were improved in those cases where a lecture on the management of shock preceded a simulated exercise on the management of septic shock. The administration of the septic shock simulations allowed for performance measurements to be calculated for both medical interns and for subsequent management by a larger resident-led team. The analysis revealed that receiving a lecture on shock before managing a simulated patient with septic shock did not produce scores higher than for those who did not receive the previous lecture. This result was similar for both interns managing the patient and for subsequent management by a resident-led team. We failed to find an immediate impact on clinical performance in simulations of septic shock after a lecture on the management of this syndrome. Lectures are likely not a reliable sole method for improving clinical performance in the management of complex disease processes.

  19. Teachers of young children (3-5 years old and their interaction with pupils: approaching positive classroom management

    Directory of Open Access Journals (Sweden)

    Fryni Paraskevopoulou

    2006-04-01

    Full Text Available This paper explores the social and emotional development of children between three to five years old, the factors that affect their in-school behaviour and strategies for positive teacher classroom management. It is suggested that teachers need to reflect upon children’s development in order for an effective classroom management to be achieved. Aspects of teachers’ expectations about interaction between children and teachers will also be exemplified. Literature research was employed as a method to explore the relevant issues.

  20. Progression in Complexity: Contextualizing Sustainable Marine Resources Management in a 10th Grade Classroom

    Science.gov (United States)

    Bravo-Torija, Beatriz; Jiménez-Aleixandre, María-Pilar

    2012-01-01

    Sustainable management of marine resources raises great challenges. Working with this socio-scientific issue in the classroom requires students to apply complex models about energy flow and trophic pyramids in order to understand that food chains represent transfer of energy, to construct meanings for sustainable resources management through discourse, and to connect them to actions and decisions in a real-life context. In this paper we examine the process of elaboration of plans for resources management in a marine ecosystem by 10th grade students (15-16 year) in the context of solving an authentic task. A complete class ( N = 14) worked in a sequence about ecosystems. Working in small groups, the students made models of energy flow and trophic pyramids, and used them to solve the problem of feeding a small community for a long time. Data collection included videotaping and audiotaping of all of the sessions, and collecting the students' written productions. The research objective is to examine the process of designing a plan for sustainable resources management in terms of the discursive moves of the students across stages in contextualizing practices, or different degrees of complexity (Jiménez-Aleixandre & Reigosa International Journal of Science Education, 14(1): 51-61 2006), understood as transformations from theoretical statements to decisions about the plan. The analysis of students' discursive moves shows how the groups progressed through stages of connecting different models, between them and with the context, in order to solve the task. The challenges related to taking this sustainability issue to the classroom are discussed.

  1. More explicit communication after classroom-based crew resource management training: results of a pragmatic trial.

    Science.gov (United States)

    Verbeek-van Noord, Inge; de Bruijne, Martine C; Twisk, Jos W R; van Dyck, Cathy; Wagner, Cordula

    2015-02-01

    Aviation-based crew resource management trainings to optimize non-technical skills among professionals are often suggested for health care as a way to increase patient safety. Our aim was to evaluate the effect of a 2-day classroom-based crew resource management (CRM) training at emergency departments (EDs) on explicit professional oral communication (EPOC; non-technical skills). A pragmatic controlled before-after trial was conducted. Four EDs of general teaching hospitals were recruited (two intervention and two control departments). ED nurses and ED doctors were observed on their non-technical skills by means of a validated observation tool (EPOC). Our main outcome measure was the amount of EPOC observed per interaction in 30 minutes direct observations. Three outcome measures from EPOC were analysed: human interaction, anticipation on environment and an overall EPOC score. Linear and logistic mixed model analyses were performed. Models were corrected for the outcome measurement at baseline, days between training and observation, patient safety culture and error management culture at baseline. A statistically significant increase after the training was found on human interaction (β=0.27, 95% CI 0.08-0.49) and the overall EPOC score (β=0.25, 95% CI 0.06-0.43), but not for anticipation on environment (OR=1.19, 95% CI .45-3.15). This means that approximately 25% more explicit communication was shown after CRM training. We found an increase in the use of CRM skills after classroom-based crew resource management training. This study adds to the body of evidence that CRM trainings have the potential to increase patient safety by reducing communication flaws, which play an important role in health care-related adverse events. © 2014 John Wiley & Sons, Ltd.

  2. Dynamic Stall in Pitching Airfoils: Aerodynamic Damping and Compressibility Effects

    Science.gov (United States)

    Corke, Thomas C.; Thomas, Flint O.

    2015-01-01

    Dynamic stall is an incredibly rich fluid dynamics problem that manifests itself on an airfoil during rapid, transient motion in which the angle of incidence surpasses the static stall limit. It is an important element of many manmade and natural flyers, including helicopters and supermaneuverable aircraft, and low-Reynolds number flapping-wing birds and insects. The fluid dynamic attributes that accompany dynamic stall include an eruption of vorticity that organizes into a well-defined dynamic stall vortex and massive excursions in aerodynamic loads that can couple with the airfoil structural dynamics. The dynamic stall process is highly sensitive to surface roughness that can influence turbulent transition and to local compressibility effects that occur at free-stream Mach numbers that are otherwise incompressible. Under some conditions, dynamic stall can result in negative aerodynamic damping that leads to limit-cycle growth of structural vibrations and rapid mechanical failure. The mechanisms leading to negative damping have been a principal interest of recent experiments and analysis. Computational fluid dynamic simulations and low-order models have not been good predictors so far. Large-eddy simulation could be a viable approach although it remains computationally intensive. The topic is technologically important owing to the desire to develop next-generation rotorcraft that employ adaptive rotor dynamic stall control.

  3. Project Termination Report. Title IV-C Classroom Management Project. ESEA Title IV-C, August 29, 1981 - September 30, 1982.

    Science.gov (United States)

    Halasa, Ofelia; Theus, Frank

    This report provides a summary description of the Title IV-C Classroom Management Project conducted in the Cleveland (Ohio) Public Schools. The purpose of this project was to develop and pilot test a resource handbook designed to improve elementary and secondary school teachers' ability to organize and manage their classrooms. The development of…

  4. A Mixed Methods Case Study: Exploring the Association between Teachers' Perceived Self-Efficacy and Classroom Management Skills at a Middle School in Central Pennsylvania

    Science.gov (United States)

    Stuart, Charles Edward

    2017-01-01

    Teacher efficacy has been researched for over 30 years, teacher efficacy refers to the beliefs of teachers in their abilities to have an impact on classroom management. Classroom management skills have been proven to be a plaguing aspect of the teaching and learning process over the past century. This study answers question about classroom…

  5. Classroom Management in Pre-Service Teachers' Teaching Practice Demo Lessons: A Comparison to Actual Lessons by In-Service English Teachers

    Science.gov (United States)

    Korkut, Perihan

    2017-01-01

    The pre-service teachers find the chance to practice their classroom management skills during their practicum as they present demo lessons under supervision of their university instructors and mentor teachers. It had been discovered in a previous study, however, that the interactional features during the classroom management episodes in…

  6. Classroom Management Instruction in the Context of a School-University Partnership: A Case Study of Team-Based Curriculum Deliberation, Design, and Delivery

    Science.gov (United States)

    Gimbert, Belinda

    2008-01-01

    This case study explored a process of team-based curriculum deliberation, design, and delivery, used to teach a classroom management course in the context of a school university partnership. A team of university and school-based teacher educators negotiated how best to prepare preservice teachers with effective classroom management knowledge and…

  7. Attention Deficit Disorder (ADHD: Primary school teachers' knowledge of symptoms, treatment and managing classroom behaviour

    Directory of Open Access Journals (Sweden)

    Beryl Topkin

    2015-05-01

    Full Text Available ADHD is one of the most common chronic conditions of childhood. Teachers are a valuable source of information with regard to referral and diagnosis of the disorder. They also play a major role in creating an environment that is conducive to academic, social and emotional success for children with ADHD. The aim of this study was to examine primary school teachers' knowledge of the symptoms and management of children in their classrooms who were diagnosed with ADHD. The participants were 200 South African primary school teachers (178 female, 22 male; mean age = 43 years of children enrolled in Grades One to Four. A self-administered questionnaire, the Knowledge of Attention-Deficit Disorder Scale (KADDS, which measures the misperceptions and understanding of the disorder, was used to collect the data. The results indicated that overall, 45% of the teachers correctly identified the responses to the items asked in the questionnaire. The "don't know responses" accounted for 31% of responses, while 22% of the responses were incorrectly identified. Furthermore, teachers were more knowledgeable of the general associated features of ADHD than of symptoms, diagnosis and treatment. A majority of teachers indicated that they had received training. These findings suggest a need to consider improving evidenced-based classroom interventions for ADHD among South African teachers.

  8. Classroom Management Training for Teachers in Urban Environments Serving Predominately African American Students: A Review of the Literature

    Science.gov (United States)

    Larson, Kristine E.

    2016-01-01

    The purpose of this paper was to review the literature in terms of professional development activities that researchers have enlisted to reduce student problem behaviors and improve classroom management competencies among teachers who work in urban environments serving predominately African American students. First, the author conducted a…

  9. Classroom Behaviour Management: The Effects of In-Service Training on Elementary Teachers' Self-Efficacy Beliefs

    Science.gov (United States)

    Gaudreau, Nancy; Royer, Égide; Frenette, Éric; Beaumont, Claire; Flanagan, Tara

    2013-01-01

    We examined a training program in classroom management in relation to the efficacy beliefs of elementary school teachers. The training program used a quasi-experimental design with a waitlist control group. Twenty-seven elementary school teachers in the greater Quebec City area participated. The repeated measures ANOVA results revealed positive…

  10. Increasing In-Service Teacher Implementation of Classroom Management Practices through Consultation, Implementation Planning, and Participant Modeling

    Science.gov (United States)

    Hagermoser Sanetti, Lisa M.; Williamson, Kathleen M.; Long, Anna C. J.; Kratochwill, Thomas R.

    2018-01-01

    Numerous evidence-based classroom management strategies to prevent and respond to problem behavior have been identified, but research consistently indicates teachers rarely implement them with sufficient implementation fidelity. The purpose of this study was to evaluate the effectiveness of implementation planning, a strategy involving logistical…

  11. When Knowing Is Not Enough--The Relevance of Teachers' Cognitive and Emotional Resources for Classroom Management

    Science.gov (United States)

    Seiz, Johanna; Voss, Thamar; Kunter, Mareike

    2015-01-01

    This study expands the discussion on teacher competence by investigating the relevance of teachers' combined cognitive resources and emotional resources for effective classroom management. While research on teacher qualification stresses the importance of knowledge for effective teaching, research on teacher stress focuses on their emotional…

  12. Generating Academic Urgency through Improved Classroom Management: A Case Study of a University and Urban Charter High School Partnership

    Science.gov (United States)

    Morales, Erik E.

    2017-01-01

    This case study documents a university and secondary school partnership designed to improve classroom management and student time on task at an urban charter high school. The initiative utilized the expertise and knowledge of college of education faculty to identify and ameliorate the high school's observed barriers to students' time on task, and…

  13. Turkish Preschool Teachers' Beliefs and Practices Related to Two Dimensions of Developmentally Appropriate Classroom Management

    Science.gov (United States)

    Sahin-Sak, Ikbal Tuba; Tantekin-Erden, Feyza; Pollard-Durodola, Sharolyn

    2018-01-01

    The purpose of this study was to describe to what extent four preschool teachers in Turkey have developmentally appropriate beliefs and practices related to two dimensions of classroom management. The participants of the study were four female teachers working in Ankara. The data of this study were collected through a demographic information…

  14. Preservice Teachers' Classroom Management Training: A Survey of Self-Reported Training Experiences, Content Coverage, and Preparedness

    Science.gov (United States)

    Christofferson, Michael; Sullivan, Amanda L.

    2015-01-01

    Many teachers report that their preservice training in classroom management was inadequate or ineffective, but little is known about the types of training they receive. In this exploratory study, 157 preservice teachers from throughout the United States were surveyed about the training sources through which they obtained knowledge and skills in…

  15. Associations of Newly Qualified Teachers' Beliefs with Classroom Management Practices and Approaches to Instruction over One School Year

    Science.gov (United States)

    Aus, Kati; Jõgi, Anna-Liisa; Poom-Valickis, Katrin; Eisenschmidt, Eve; Kikas, Eve

    2017-01-01

    We focus on assessing whether newly qualified teachers' professional outcome expectations and their beliefs about students' intellectual potential are associated with teachers' self-reported classroom management and instructional practices. One hundred and eighteen novice teachers participating in the induction year programme were studied during…

  16. Using the Assessment Model for Developing Learning Managements in Enrichment Science Classrooms of Upper Secondary Educational Students' Outcomes in Thailand

    Science.gov (United States)

    Athan, Athit; Srisa-ard, Boonchom; Suikraduang, Arun

    2015-01-01

    The aim of this work is to develop and investigate the model for assessing learning management on the enrichment science classrooms in the upper secondary education of the Development and Promotion of Science and Technology Talents Project in Thailand. Using the research methodologies with the four phases: to investigate the background of the…

  17. Classroom Management and National Professional Standards for Teachers: A Review of the Literature on Theory and Practice

    Science.gov (United States)

    Egeberg, Helen M.; McConney, Andrew; Price, Anne

    2016-01-01

    This article reviews the conceptual and empirical research on classroom management to ascertain the extent to which there is consistency between the "advice" found in the research literature and the professional standards for teachers and initial teacher education, in regards to knowledge and perspectives about effective classroom…

  18. Classroom Management Strategies of Highly Effective Teachers in Diverse Middle Schools: Be Strict and Calm, Not Mean

    Science.gov (United States)

    McGregor, Katheryne L.

    2012-01-01

    This qualitative research study investigated and identified the classroom management strategies of 12 highly effective middle school teachers who served diverse student populations at two different school sites. In addition, this research explored the beliefs and experiences of 305 diverse middle school students regarding their experiences with…

  19. A Case Based Analysis Preparation Strategy for Use in a Classroom Management for Inclusive Settings Course: Preliminary Observations

    Science.gov (United States)

    Niles, William J.; Cohen, Alan

    2012-01-01

    Case based instruction (CBI) is a pedagogical option in teacher preparation growing in application but short on practical means to implement the method. This paper presents an analysis strategy and questions developed to help teacher trainees focus on classroom management issues embedded in a set of "real" cases. An analysis of teacher candidate…

  20. Academic Practices to Gain and Maintain Student-Teacher Connectedness and Classroom Behavioral Management, Related to Educator Demographics

    Science.gov (United States)

    Kendall, Leslie Threadgill

    2015-01-01

    Connectedness and classroom management has been defined as the ability to relate to students and keep order and maintain successful relationships with individuals. This qualitative study utilized surveys, questionnaires, interviews, and observations to examine the best practices implemented by educators to develop and maintain connections with…

  1. Teacher Progress Monitoring of Instructional and Behavioral Management Practices: An Evidence-Based Approach to Improving Classroom Practices

    Science.gov (United States)

    Reddy, Linda A.; Dudek, Christopher M.

    2014-01-01

    In the era of teacher evaluation and effectiveness, assessment tools that identify and monitor educators' instruction and behavioral management practices are in high demand. The Classroom Strategies Scale (CSS) Observer Form is a multidimensional teacher progress monitoring tool designed to assess teachers' usage of instructional and behavioral…

  2. Teachers' Use of Classroom Management Procedures in the United States and Greece: A Cross-Cultural Comparison

    Science.gov (United States)

    Akin-Little, K. Angeleque; Little, Steven G.; Laniti, Mariana

    2007-01-01

    A survey was conducted of teachers' classroom management practices in the United States and Greece. The United States sample consisted of 149 teachers in Arizona, Illinois, Louisiana, Mississippi and Alabama. The Greek sample consisted of 97 teachers in Athens and the surrounding area. The survey asked questions regarding teachers' use of…

  3. The Role of Knowledge and Skills for Managing Emotions in Adaptation to School: Social Behavior and Misconduct in the Classroom

    Science.gov (United States)

    Lopes, Paulo N.; Mestre, Jose M.; Guil, Rocio; Kremenitzer, Janet Pickard; Salovey, Peter

    2012-01-01

    Students' ability to evaluate emotionally challenging situations and identify effective strategies for managing emotions in themselves and others was negatively related to poor classroom social behavior across three studies. These studies, involving 463 students from two Spanish high schools and one American university, examined indicators of…

  4. Refugee-Teacher-Train-Refugee-Teacher Intervention Research in Malaysia: Promoting Classroom Management and Teacher Self-Care

    Science.gov (United States)

    O'Neal, Colleen R.; Gosnell, Nicole M.; Ng, Wai Sheng; Ong, Edward

    2018-01-01

    Given the current refugee crisis, the development of sustainable postconflict refugee education systems and supports is essential. The present study reports Resilient Refugee Education (RRE) intervention effects on refugee teacher confidence and knowledge of classroom management, in addition to refugee teacher self-care in Malaysia. We compared…

  5. A Cross-Cultural Study of Students' Behaviors and Classroom Management Strategies in the USA and Korea

    Science.gov (United States)

    Shin, Sunwoo; Koh, Myung-sook

    2008-01-01

    The purpose of this cross-cultural study is to investigate comparative students' problem behaviors and classroom behavior management strategies for students in urban public schools between teachers in the United States and Korea. This study incorporated data collected from two different teacher self-reported survey questionnaires, the Student…

  6. The Incredible Years Teacher Classroom Management Training: The Methods and Principles That Support Fidelity of Training Delivery

    Science.gov (United States)

    Webster-Stratton, Carolyn; Reinke, Wendy M.; Herman, Keith C.; Newcomer, Lori L.

    2011-01-01

    This article focuses on the Incredible Years Teacher Classroom Management (IY TCM) intervention as an example of an evidence-based program that embeds fidelity and adaptation within its design. First, the core features of the IY TCM program along with the methods, processes, and principles that make the intervention effective are described. The…

  7. Flap motion of helicopter rotors with novel, dynamic stall model

    Directory of Open Access Journals (Sweden)

    Han Wei

    2016-01-01

    Full Text Available In this paper, a nonlinear flapping equation for large inflow angles and flap angles is established by analyzing the aerodynamics of helicopter blade elements. In order to obtain a generalized flap equation, the Snel stall model was first applied to determine the lift coefficient of the helicopter rotor. A simulation experiment for specific airfoils was then conducted to verify the effectiveness of the Snel stall model as it applies to helicopters. Results show that the model requires no extraneous parameters compared to the traditional stall model and is highly accurate and practically applicable. Based on the model, the relationship between the flapping angle and the angle of attack was analyzed, as well as the advance ratio under the dynamic stall state.

  8. Empowering HCI Students to Better Manage their Learning Process through a Flipped Classroom Experience

    Directory of Open Access Journals (Sweden)

    Silvia Gabrielli

    2016-08-01

    Full Text Available This position paper presents observations from a flipped classroom experience of teaching an HCI bachelor course at the University of Trento (Italy in Fall 2015. Students were provided with conventional lectures, digital learning materials in Moodle, and a collaborative prototyping platform for supporting project work over the 2-months course duration. Overall, students highly appreciated the flexibility of having access to a combination of digital and conventional teaching resources. However, we observed a rather slow adoption of the remote collaboration features offered by the prototyping platform during the project work. This shows students’ initial reluctance and lack of familiarity with using asynchronous communication-collaboration tools for better managing their group work and learning in blended education programs.

  9. HAWT dynamic stall response asymmetries under yawed flow conditions

    Energy Technology Data Exchange (ETDEWEB)

    Schreck, S.; Robinson, M.; Hand, M.; Simms, D.

    2000-02-28

    Horizontal axis wind turbines can experience significant time varying aerodynamic loads, potentially causing adverse effects on structures, mechanical components, and power production. As designers attempt lighter and more flexible wind energy machines, greater accuracy and robustness will become even more critical in future aerodynamics models. Aerodynamics modeling advances, in turn, will rely on more thorough comprehension of the three-dimensional, unsteady, vortical flows that dominate wind turbine blade aerodynamics under high load conditions. To experimentally characterize these flows, turbine blade surface pressures were acquired at multiple span locations via the NREL Phase IV Unsteady Aerodynamics Experiment. Surface pressures and associated normal force histories were used to characterize dynamic stall vortex kinematics and normal force amplification. Dynamic stall vortices and normal force amplification were confirmed to occur in response to angle of attack excursions above the static stall threshold. Stall vortices occupied approximately one-half of the blade span and persisted for nearly one-fourth of the blade rotation cycle. Stall vortex convection varied along the blade, resulting in dramatic deformation of the vortex. Presence and deformation of the dynamic stall vortex produced corresponding amplification of normal forces. Analyses revealed consistent alterations to vortex kinematics in response to changes in reduced frequency, span location, and yaw error. Finally, vortex structures and kinematics not previously documented for wind turbine blades were isolated.

  10. Is Social Licence A Licence To Stall?

    Directory of Open Access Journals (Sweden)

    Mark Lowey

    2016-03-01

    Full Text Available The School of Public Policy at the University of Calgary organized a one-day symposium on Oct. 8, 2014 in Calgary, as part of the School’s TransCanada Corporation Energy Policy and Regulatory Frameworks Program. The symposium was titled “Is Social License a License to Stall?” Held at the Hotel Arts, the event attracted a full-capacity audience of about 110 people, including representatives from industry, government and environmental non-government organizations. The symposium included four moderated panel sessions and a keynote speaker at lunch. The School of Public Policy set the framework for discussion at the Calgary symposium with the following description: Canada’s regulators act in the public interest to review energy and infrastructure project applications. Regulators are guided by procedural fairness and follow a transparent application, review and hearing process with data filings and sworn testimony. But that’s changing. “Social license” is a relatively new term, which some interests are using to create a different standard for the approval of projects — especially energy projects. According to social license advocates, projects must meet often ill-defined requirements set up by non-governmental organizations, local residents or other interests — a new hurdle for project approval, but without the rigour and rule of law of a regulator. Is social license a meaningful addition to the regulatory process, or is it being used as a constantly moving goal-post designed to slow down regulatory processes, delay project implementation, frustrate energy infrastructure expansion and even enrich those advocates who promote it as a new model? This paper summarises the discussion and the themes that emerged throughout the day. Most notably, panellists concluded that “social licence” is a real and significant issue that presents both an opportunity and a problem, not only for regulators but for all parties involved in the

  11. An Examination of New Zealand Teachers' Attributions and Perceptions of Behaviour, Classroom Management, and the Level of Formal Teacher Training Received in Behaviour Management

    Science.gov (United States)

    Johansen, Anita; Little, Steven G.; Akin-Little, Angeleque

    2011-01-01

    The way in which behaviour is perceived and managed by teachers can influence the classroom environment. The current study examined teachers' perceptions of the cause of school behavioural problems and the effectiveness of positive behavioural interventions. It also examined the level of formal training participants have received in behaviour…

  12. A Mixed-Methods Evaluation of the Longer-Term Implementation and Utility of a Teacher Classroom Management Training Programme in Irish Primary Schools

    Science.gov (United States)

    Leckey, Yvonne; Hyland, Lynda; Hickey, Gráinne; Lodge, Anne; Kelly, Paul; Bywater, Tracey; Comiskey, Catherine; Donnelly, Michael; McGilloway, Sinéad

    2016-01-01

    Inappropriate, aggressive and disruptive behaviour in the classroom can be detrimental to child and teacher well-being. This study involved a longer-term evaluation of the "Incredible Years Teacher [Classroom Management]" programme (IYTP) undertaken mainly within disadvantaged schools in south-west Ireland. The IYTP is designed to…

  13. Exploring the Effects of a Universal Classroom Management Training Programme on Teacher and Child Behaviour: A Group Randomised Controlled Trial and Cost Analysis

    Science.gov (United States)

    Hickey, Grainne; McGilloway, Sinead; Hyland, Lynda; Leckey, Yvonne; Kelly, Paul; Bywater, Tracey; Comiskey, Catherine; Lodge, Anne; Donnelly, Michael; O'Neill, Donal

    2017-01-01

    Teachers frequently struggle to cope with conduct problems in the classroom. The aim of this study was to assess the effectiveness of the Incredible Years Teacher Classroom Management Training Programme for improving teacher competencies and child adjustment. The study involved a group randomised controlled trial which included 22 teachers and 217…

  14. Dynamic Stall Characteristics of Drooped Leading Edge Airfoils

    Science.gov (United States)

    Sankar, Lakshmi N.; Sahin, Mehmet; Gopal, Naveen

    2000-01-01

    Helicopters in high-speed forward flight usually experience large regions of dynamic stall over the retreating side of the rotor disk. The rapid variations in the lift and pitching moments associated with the stall process can result in vibratory loads, and can cause fatigue and failure of pitch links. In some instances, the large time lag between the aerodynamic forces and the blade motion can trigger stall flutter. A number of techniques for the alleviation of dynamic stall have been proposed and studied by researchers. Passive and active control techniques have both been explored. Passive techniques include the use of high solidity rotors that reduce the lift coefficients of individual blades, leading edge slots and leading edge slats. Active control techniques include steady and unsteady blowing, and dynamically deformable leading edge (DDLE) airfoils. Considerable amount of experimental and numerical data has been collected on the effectiveness of these concepts. One concept that has not received as much attention is the drooped-leading edge airfoil idea. It has been observed in wind tunnel studies and flight tests that drooped leading edge airfoils can have a milder dynamic stall, with a significantly milder load hysteresis. Drooped leading edge airfoils may not, however, be suitable at other conditions, e.g. in hover, or in transonic flow. Work needs to be done on the analysis and design of drooped leading edge airfoils for efficient operation in a variety of flight regimes (hover, dynamic stall, and transonic flow). One concept that is worthy of investigation is the dynamically drooping airfoil, where the leading edge shape is changed roughly once-per-rev to mitigate the dynamic stall.

  15. Classroom management of situated group learning: A research study of two teaching strategies

    Science.gov (United States)

    Smeh, Kathy; Fawns, Rod

    2000-06-01

    Although peer-based work is encouraged by theories in developmental psychology and although classroom interventions suggest it is effective, there are grounds for recognising that young pupils find collaborative learning hard to sustain. Discontinuities in collaborative skill during development have been suggested as one interpretation. Theory and research have neglected situational continuities that the teacher may provide in management of formal and informal collaborations. This experimental study, with the collaboration of the science faculty in one urban secondary college, investigated the effect of two role attribution strategies on communication in peer groups of different gender composition in three parallel Year 8 science classes. The group were set a problem that required them to design an experiment to compare the thermal insulating properties of two different materials. This presents the data collected and key findings, and reviews the findings from previous parallel studies that have employed the same research design in different school settings. The results confirm the effectiveness of social role attribution strategies in teacher management of communication in peer-based work.

  16. Does classroom-based Crew Resource Management training improve patient safety culture? A systematic review

    Directory of Open Access Journals (Sweden)

    Inge Verbeek-van Noord

    2014-04-01

    Full Text Available Aim: To evaluate the evidence of the effectiveness of classroom-based Crew Resource Management training on safety culture by a systematic review of literature. Methods: Studies were identified in PubMed, Cochrane Library, PsycINFO, and Educational Resources Information Center up to 19 December 2012. The Methods Guide for Comparative Effectiveness Reviews was used to assess the risk of bias in the individual studies. Results: In total, 22 manuscripts were included for review. Training settings, study designs, and evaluation methods varied widely. Most studies reporting only a selection of culture dimensions found mainly positive results, whereas studies reporting all safety culture dimensions of the particular survey found mixed results. On average, studies were at moderate risk of bias. Conclusion: Evidence of the effectiveness of Crew Resource Management training in health care on safety culture is scarce and the validity of most studies is limited. The results underline the necessity of more valid study designs, preferably using triangulation methods.

  17. Group contingencies for group consequences in classroom management: a further analysis.

    Science.gov (United States)

    Greenwood, C R; Hops, H; Delquadri, J; Guild, J

    1974-01-01

    The relative effects of rules, rules + feedback, and rules + feedback + group and individual consequences for appropriate behavior were investigated in three elementary classrooms during reading and mathematics periods. The consequences were individual and group praise, and group activities. The total intervention package (rules + feedback + group and individual consequences) was most effective in increasing appropriate behavior. Rules + feedback produced increased appropriate behavior in two of the three classrooms. Rules alone produced no change in classroom behavior. Maintenance of appropriate classroom behavior was noted approximately three weeks after the program ended. Teacher's correct use of praise was also maintained for two of the three teachers at levels generated during the total package condition.

  18. The Dynamics of SecM-Induced Translational Stalling

    Directory of Open Access Journals (Sweden)

    Albert Tsai

    2014-06-01

    Full Text Available SecM is an E. coli secretion monitor capable of stalling translation on the prokaryotic ribosome without cofactors. Biochemical and structural studies have demonstrated that the SecM nascent chain interacts with the 50S subunit exit tunnel to inhibit peptide bond formation. However, the timescales and pathways of stalling on an mRNA remain undefined. To provide a dynamic mechanism for stalling, we directly tracked the dynamics of elongation on ribosomes translating the SecM stall sequence (FSTPVWISQAQGIRAGP using single-molecule fluorescence techniques. Within 1 min, three peptide-ribosome interactions work cooperatively over the last five codons of the SecM sequence, leading to severely impaired elongation rates beginning from the terminal proline and lasting four codons. Our results suggest that stalling is tightly linked to the dynamics of elongation and underscore the roles that the exit tunnel and nascent chain play in controlling fundamental steps in translation.

  19. The dynamics of SecM-induced translational stalling.

    Science.gov (United States)

    Tsai, Albert; Kornberg, Guy; Johansson, Magnus; Chen, Jin; Puglisi, Joseph D

    2014-06-12

    SecM is an E. coli secretion monitor capable of stalling translation on the prokaryotic ribosome without cofactors. Biochemical and structural studies have demonstrated that the SecM nascent chain interacts with the 50S subunit exit tunnel to inhibit peptide bond formation. However, the timescales and pathways of stalling on an mRNA remain undefined. To provide a dynamic mechanism for stalling, we directly tracked the dynamics of elongation on ribosomes translating the SecM stall sequence (FSTPVWISQAQGIRAGP) using single-molecule fluorescence techniques. Within 1 min, three peptide-ribosome interactions work cooperatively over the last five codons of the SecM sequence, leading to severely impaired elongation rates beginning from the terminal proline and lasting four codons. Our results suggest that stalling is tightly linked to the dynamics of elongation and underscore the roles that the exit tunnel and nascent chain play in controlling fundamental steps in translation. Copyright © 2014 The Authors. Published by Elsevier Inc. All rights reserved.

  20. A Comparative Study of Three Methodologies for Modeling Dynamic Stall

    Science.gov (United States)

    Sankar, L.; Rhee, M.; Tung, C.; ZibiBailly, J.; LeBalleur, J. C.; Blaise, D.; Rouzaud, O.

    2002-01-01

    During the past two decades, there has been an increased reliance on the use of computational fluid dynamics methods for modeling rotors in high speed forward flight. Computational methods are being developed for modeling the shock induced loads on the advancing side, first-principles based modeling of the trailing wake evolution, and for retreating blade stall. The retreating blade dynamic stall problem has received particular attention, because the large variations in lift and pitching moments encountered in dynamic stall can lead to blade vibrations and pitch link fatigue. Restricting to aerodynamics, the numerical prediction of dynamic stall is still a complex and challenging CFD problem, that, even in two dimensions at low speed, gathers the major difficulties of aerodynamics, such as the grid resolution requirements for the viscous phenomena at leading-edge bubbles or in mixing-layers, the bias of the numerical viscosity, and the major difficulties of the physical modeling, such as the turbulence models, the transition models, whose both determinant influences, already present in static maximal-lift or stall computations, are emphasized by the dynamic aspect of the phenomena.

  1. Time Accurate Unsteady Simulation of the Stall Inception Process in the Compression System of a US Army Helicopter Gas Turbine Engine

    National Research Council Canada - National Science Library

    Hathaway, Michael D; Herrick, Greg; Chen, Jenping; Webster, Robert

    2004-01-01

    .... Improved understanding of the stall inception process and how stall control technologies mitigate such will provide compressors with increased tolerance to stall, thereby expanding the operational...

  2. Elementary and Secondary School Students' Perceptions of Teachers' Classroom Management Competencies

    Science.gov (United States)

    Kalin, Jana; Peklaj, Cirila; Pecjak, Sonja; Levpušcek, Melita Puklek; Zuljan, Milena Valencic

    2017-01-01

    Teachers with proper training in knowledge transfer to different students, in the creation of suitable learning conditions, the motivation of students for active cooperation and peer learning, in the formation of classroom community, as well as independent and responsible personalities, can provide quality education. Teacher's classroom management…

  3. Management of the Physical Environment in the Classroom and Gymnasium: It's Not "That" Different

    Science.gov (United States)

    Culp, Brian

    2006-01-01

    This article extends information from a text by Weinstein and Mignano (2003) to address classroom organization in terms of the physical environment. That text is an extrapolation of Steele's (1973) outline of six functions within the classroom setting: (1) security and shelter; (2) social contact; (3) symbolic identification; (4) pleasure; (5)…

  4. PTEN Regulates DNA Replication Progression and Stalled Fork Recovery

    Science.gov (United States)

    He, Jinxue; Kang, Xi; Yin, Yuxin; Chao, K.S. Clifford; Shen, Wen H.

    2015-01-01

    Faithful DNA replication is a cornerstone of genomic integrity. PTEN plays multiple roles in genome protection and tumor suppression. Here we report on the importance of PTEN in DNA replication. PTEN depletion leads to impairment of replication progression and stalled fork recovery, indicating an elevation of endogenous replication stress. Exogenous replication inhibition aggravates replication-originated DNA lesions without inducing S-phase arrest in cells lacking PTEN, representing replication stress tolerance. Our analysis reveals the physical association of PTEN with DNA replication forks and PTEN-dependent recruitment of Rad51. PTEN deletion results in Rad51 dissociation from replication forks. Stalled replication forks in Pten null cells can be reactivated by ectopic Rad51 or PTEN, the latter facilitating chromatin loading of Rad51. These data highlight the interplay of PTEN with Rad51 in promoting stalled fork restart. We propose that loss of PTEN may initiate a replication stress cascade that progressively deteriorates through the cell cycle. PMID:26158445

  5. Active Suppression of Rotating Stall Inception with Distributed Jet Actuation

    Directory of Open Access Journals (Sweden)

    Huu Duc Vo

    2007-01-01

    Full Text Available An analytical and experimental investigation of the effectiveness of full-span distributed jet actuation for active suppression of long length-scale rotating stall inception is carried out. Detailed modeling and experimental verification highlight the important effects of mass addition, discrete injectors, and feedback dynamics, which may be overlooked in preliminary theoretical studies of active control with jet injection. A model of the compression system incorporating nonideal injection and feedback dynamics is verified with forced response measurements to predict the right trends in the movement of the critical pole associated with the stall precursor. Active control experiments with proportional feedback control show that the predicted stall precursors are suppressed to give a 5.5% range extension in compressor flow coefficient. In addition, results suggest that the proposed model could be used to design a more sophisticated controller to further improve performance while reducing actuator bandwidth requirements.

  6. Stall Recovery Guidance Algorithms Based on Constrained Control Approaches

    Science.gov (United States)

    Stepanyan, Vahram; Krishnakumar, Kalmanje; Kaneshige, John; Acosta, Diana

    2016-01-01

    Aircraft loss-of-control, in particular approach to stall or fully developed stall, is a major factor contributing to aircraft safety risks, which emphasizes the need to develop algorithms that are capable of assisting the pilots to identify the problem and providing guidance to recover the aircraft. In this paper we present several stall recovery guidance algorithms, which are implemented in the background without interfering with flight control system and altering the pilot's actions. They are using input and state constrained control methods to generate guidance signals, which are provided to the pilot in the form of visual cues. It is the pilot's decision to follow these signals. The algorithms are validated in the pilot-in-the loop medium fidelity simulation experiment.

  7. The Effect of Use of Classroom Management Software in Programming Fundamentals Course with Collaborative Method on Student Success

    OpenAIRE

    Fulya ASLAY; Durmuş ÖZDEMİR; Funda AKAR; Ahmet BARAN

    2016-01-01

    The purpose of the study was to determine the effect of use of classroom management software in “Programming Fundamentals” course with collaborative method on student success. The sample of the study consisted of the students studying at Computer Programming program of Vocational School, Erzincan University and taking the course of Programming Fundamentals. Random experimental design with pretest-posttest control groups was used in the study. Depending on the experimental design, experimental...

  8. Strategies for Teachers to Manage Stuttering in the Classroom: A Call for Research.

    Science.gov (United States)

    Davidow, Jason H; Zaroogian, Lisa; Garcia-Barrera, Mauricio A

    2016-10-01

    This clinical focus article highlights the need for future research involving ways to assist children who stutter in the classroom. The 4 most commonly recommended strategies for teachers were found via searches of electronic databases and personal libraries of the authors. The peer-reviewed evidence for each recommendation was subsequently located and detailed. There are varying amounts of evidence for the 4 recommended teacher strategies outside of the classroom, but there are no data for 2 of the strategies, and minimal data for the others, in a classroom setting. That is, there is virtually no evidence regarding whether or not the actions put forth influence, for example, stuttering frequency, stuttering severity, participation, or the social, emotional, and cognitive components of stuttering in the classroom. There is a need for researchers and speech-language pathologists in the schools to study the outcomes of teacher strategies in the classroom for children who stutter.

  9. Does classroom-based crew resource management training have an effect on attitudes between doctors and nurses?

    Science.gov (United States)

    Chan, Christina K W; So, Hang-kwong; Ng, Wing-yiu; Chan, Pei-kei; Ma, Wai-ling; Chan, Kin-ling; Leung, Siu-ha; Ho, Lap-yin

    2016-04-09

    To evaluate participant reactions and attitudes to crew resource management teamwork classroom-based training by comparing Likert responses before and after the intervention and exploring potential differences in attitudes across the different healthcare professionals. Between 26 January and 27 March, 2015, a randomly selected sample of 240 frontline healthcare professionals offering direct patient care were recruited to undergo a 4-hour crew resource management classroom-based training programme. Participants were asked to complete a 22-item human factors attitude survey before and after training and a 10-item end-of-programme evaluation. Paired samples t-test was used to assess differences between the participants' pretest and posttest scores on each item. A total of 167 (70%) from 17 different specialties underwent the training and 164 (68.3%) completed (139 nurses, 25 doctors) the survey. The nurses were of similar age to the doctors (38.2 vs 36.9, p=0.83) and were more likely to be women (75.6% vs 24.6%, p management classroom-based training programme appeared to have a positive effect on frontline healthcare professionals' attitudes. The implementation of such programme is feasible and acceptable, especially for nurses, in a public hospital setting in Hong Kong.

  10. The Effect of Use of Classroom Management Software in Programming Fundamentals Course with Collaborative Method on Student Success

    Directory of Open Access Journals (Sweden)

    Fulya ASLAY

    2016-04-01

    Full Text Available The purpose of the study was to determine the effect of use of classroom management software in “Programming Fundamentals” course with collaborative method on student success. The sample of the study consisted of the students studying at Computer Programming program of Vocational School, Erzincan University and taking the course of Programming Fundamentals. Random experimental design with pretest-posttest control groups was used in the study. Depending on the experimental design, experimental group (n=35 and control group (n=35 were determined by using random sampling method. The questions asked by students in the experimental group were projected to blackboard by using classroom management software and the solution was asked to be found with other students in the group according to collaborative learning method. The students in the control group were answered directly from student’s monitor with classroom management software by instructor. It was seen as a result of study that they were statistically more significant when the posttest results of the students in the course of Programming Fundamentals were examined. According the results of interview made with student, it was concluded that the students saw their mistakes, they freely expressed their thoughts, their recall skills increased and they understood the code structure better.

  11. EQUINE THERMOREGULATORY RESPONSES DURING SUMMERTIME ROAD TRANSPORT AND STALL CONFINEMENT

    Directory of Open Access Journals (Sweden)

    ANGELA R. GREEN

    2007-04-01

    Full Text Available Thermoregulatory responses of horses subjected to summer-time road transport and stall confinement were investigated in this study. Six mature geldings were transported 168 km in a 4-horse trailer and were monitored while tethered in their stalls, on alternate days. Core body temperature (GT demonstrated negligible response during transport, but GT following transport was higher than GT for non-transport. GT tended to increase with increased temperature humidity index (THI. THI within the trailer was greatest for positions near the front, and was influenced by daily weather which varied over experiment days from heat stress conditions to moderate discomfort.

  12. A dynamic stall model for airfoils with deformable trailing edges

    DEFF Research Database (Denmark)

    Andersen, Peter Bjørn; Gaunaa, Mac; Bak, Christian

    2009-01-01

    The present work contains an extension of the Beddoes-Leishman-type dynamic stall model. In this work, a deformable trailing-edge flap has been added to the dynamic stall model. The model predicts the unsteady aerodynamic forces and moments on an airfoil section undergoing arbitrary motion in hea...... for the attached flow region and Hansen et al. The model is compared qualitatively to wind tunnel measurements of a Riso/ B1-18 blade section equipped with deformable trailing-edge flap devices in the form of piezoelectric devices. Copyright © 2009 John Wiley & Sons, Ltd....

  13. Regulation of bacterial gene expression by ribosome stalling and rescuing.

    Science.gov (United States)

    Jin, Yongxin; Jin, Shouguang; Wu, Weihui

    2016-05-01

    Ribosome is responsible for protein synthesis and is able to monitor the sequence and structure of the nascent peptide. Such ability plays an important role in determining overall gene expression profile of the bacteria through ribosome stalling and rescuing. In this review, we briefly summarize our current understanding of the regulation of gene expression through ribosome stalling and rescuing in bacteria, as well as mechanisms that modulate ribosome activity. Understanding the mechanisms of how bacteria modulate ribosome activity will provide not only fundamental insights into bacterial gene regulation, but also new candidate targets for the development of novel antimicrobial agents.

  14. A dynamic stall model for airfoils with deformable trailing edges

    DEFF Research Database (Denmark)

    Andersen, Peter Bjørn; Gaunaa, Mac; Bak, Dan Christian

    2007-01-01

    on an airfoil section undergoing arbitrary motion in heave, lead-lag, pitch, Trailing Edge (TE) flapping. In the linear region, the model reduces to the inviscid model of Gaunaa [4], which includes the aerodynamic effect of a thin airfoil with a deformable camberline in inviscid flow. Therefore, the proposed......The present work contains an extension of the Beddoes-Leishman (B-L) type dynamic stall model, as described by Hansen et al. [7]. In this work a Deformable Trailing Edge Geometry (DTEG) has been added to the dynamic stall model. The model predicts the unsteady aerodynamic forces and moments...

  15. Managed airing behaviour and the effect on pupil perceptions and indoor climate in classrooms

    DEFF Research Database (Denmark)

    Toftum, Jørn; Wohlgemuth, Mette Malene; Christensen, Ulrik Sloth

    2016-01-01

    An intervention study with four different scenarios for airing classrooms were carried out in a school where manual opening of windows was the main source of ventilation. Two scenarios included a visual CO2 display unit to signal to the pupils and teachers when to open windows. The other two...... scenarios used two different window opening schedules. Measurements of CO2, temperature and periods with open windows were recorded, and pupils expressed their perception of the indoor environment in the classroom. With a visual CO2 display unit in the classroom, pupils were able to modify their behavior...

  16. Dynamic Stall Flow Control Through the Use of a Novel Plasma Based Actuator Technology, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — Lynntech proposes a novel flow control methodology for airfoils undergoing dynamic stall. Dynamic stall refers to an aerodynamic phenomenon that is experienced by...

  17. Teachers’ intended classroom management strategies for students with ADHD: a cross-cultural study between South Korea and Germany

    Directory of Open Access Journals (Sweden)

    Yumi Lee

    2016-06-01

    Full Text Available Background The purpose of this study was to investigate Korean and German teachers’ intentions of using classroom management strategies (CMS for students with attention-deficit/hyperactivity disorder (ADHD based on the theory of reasoned action (TRA and the theory of planned behavior (TPB. Participants and procedure Participants were 639 Korean and 317 German teachers. Disproportional stratified sampling was used. As a result, 264 Korean and 264 German matched teachers were obtained. Kos’s questionnaire was slightly modified. The survey instrument was distributed from September 2012 to December 2013. SPSS 22.0 was used to analyze the data. Results Korean teachers were more influenced by norms of colleagues and parents than German teachers were. Teachers in both countries have more favorable attitudes towards positive-oriented CMS compared to negative-oriented CMS, and perceived themselves as being able to control all CMS in the classroom. The TRA proved to better predict both Korean and German teachers’ intentions of using CMS compared to the TPB. Conclusions This study is an important step towards understanding teachers’ CMS in the cultural context of Korea and Germany. The findings of this study will be an essential resource to develop an ADHD management manual based on theoretical and cultural perspectives, so that teachers in both countries are prepared for students with ADHD in their classroom, rather than give up on them.

  18. Unsteady Double Wake Model for the Simulation of Stalled Airfoils

    DEFF Research Database (Denmark)

    Ramos García, Néstor; Cayron, Antoine; Sørensen, Jens Nørkær

    2015-01-01

    separation and its dynamics. In this paper, the calculated integral forces have been successfully validated against wind tunnel measurements for the FFA-W3-211 airfoil. Furthermore, the computed highly unsteady flow field is analyzed in detail for a set of angles of attack ranging from light to deep stall...

  19. Dynamic Characteristics of Rotating Stall in Mixed Flow Pump

    Directory of Open Access Journals (Sweden)

    Xiaojun Li

    2013-01-01

    Full Text Available Rotating stall, a phenomenon that causes flow instabilities and pressure hysteresis by propagating at some fraction of the impeller rotational speed, can occur in centrifugal impellers, mixed impellers, radial diffusers, or axial diffusers. Despite considerable efforts devoted to the study of rotating stall in pumps, the mechanics of this phenomenon are not sufficiently understood. The propagation mechanism and onset of rotating stall are not only affected by inlet flow but also by outlet flow as well as the pressure gradient in the flow passage. As such, the complexity of these concepts is not covered by the classical explanation. To bridge this research gap, the current study investigated prerotation generated at the upstream of the impeller, leakage flow at the tip clearance between the casing and the impeller, and strong reserve flow at the inlet of the diffuser. Understanding these areas will clarify the origin of the positive slope of the head-flow performance curve for a mixed flow pump. Nonuniform pressure distribution and adverse pressure gradient were also introduced to evaluate the onset and development of rotating stall within the diffuser.

  20. The Mechanical Impact of Aerodynamic Stall on Tunnel Ventilation Fans

    Directory of Open Access Journals (Sweden)

    A. G. Sheard

    2012-01-01

    Full Text Available This paper describes work aimed at establishing the ability of a tunnel ventilation fan to operate without risk of mechanical failure in the event of aerodynamic stall. The research establishes the aerodynamic characteristics of a typical tunnel ventilation fan when operated in both stable and stalled aerodynamic conditions, with and without an anti-stall stabilisation ring, with and without a “nonstalling” blade angle and at full, half, and one quarter design speed. It also measures the fan’s peak stress, thus facilitating an analysis of the implications of the experimental results for mechanical design methodology. The paper concludes by presenting three different strategies for tunnel ventilation fan selection in applications where the selected fan will most likely stall. The first strategy selects a fan with a low-blade angle that is nonstalling. The second strategy selects a fan with a high-pressure developing capability. The third strategy selects a fan with a fitted stabilisation ring. Tunnel ventilation system designers each have their favoured fan selection strategy. However, all three strategies can produce system designs within which a tunnel ventilation fan performs reliably in-service. The paper considers the advantages and disadvantages of each selection strategy and considered the strengths and weaknesses of each.

  1. THE IMPACT OF LOCALIZATION AND BARN TYPE ON INSOLATION OF SIDEWALL STALLS DURING SUMMER

    Directory of Open Access Journals (Sweden)

    Sabina Angrecka

    2017-07-01

    The obtained results allowed us to identify optimal orientation of barns and to suggest the simplest technical measures to protect sidewall stalls from solar heat gain deleterious to cows. The model analysis of stall shading demonstrated that extension of barn eaves to 1 m on the southern side reduced the insolation of stalls over even up to 90% of their area.

  2. A CFD Database for Airfoils and Wings at Post-Stall Angles of Attack

    Science.gov (United States)

    Petrilli, Justin; Paul, Ryan; Gopalarathnam, Ashok; Frink, Neal T.

    2013-01-01

    This paper presents selected results from an ongoing effort to develop an aerodynamic database from Reynolds-Averaged Navier-Stokes (RANS) computational analysis of airfoils and wings at stall and post-stall angles of attack. The data obtained from this effort will be used for validation and refinement of a low-order post-stall prediction method developed at NCSU, and to fill existing gaps in high angle of attack data in the literature. Such data could have potential applications in post-stall flight dynamics, helicopter aerodynamics and wind turbine aerodynamics. An overview of the NASA TetrUSS CFD package used for the RANS computational approach is presented. Detailed results for three airfoils are presented to compare their stall and post-stall behavior. The results for finite wings at stall and post-stall conditions focus on the effects of taper-ratio and sweep angle, with particular attention to whether the sectional flows can be approximated using two-dimensional flow over a stalled airfoil. While this approximation seems reasonable for unswept wings even at post-stall conditions, significant spanwise flow on stalled swept wings preclude the use of two-dimensional data to model sectional flows on swept wings. Thus, further effort is needed in low-order aerodynamic modeling of swept wings at stalled conditions.

  3. Simulation Model of an Active-stall Fixed-speed Wind Turbine Controller

    DEFF Research Database (Denmark)

    Jauch, Clemens; Hansen, Anca D.; Soerensen, Poul

    2004-01-01

    This paper describes an active-stall wind turbine controller. The objective is to develop a general model of an active stall controller in order to simulate the operation of grid connected active stall wind turbines. The active stall turbine concept and its control strategies are presented...... and evaluated by simulations. The presented controller is described for continuous operation under all wind speeds from start-up wind speed to shut down wind speed. Due to its parametric implementation it is general i.e. it can represent different active stall wind turbine controllers and can be implemented...

  4. Simulation model of an active-stall fixed-speed wind turbine controller

    Energy Technology Data Exchange (ETDEWEB)

    Jauch, C.; Hansen, A.D.; Sorensen, P.; Blaabjerg, F.

    2004-07-01

    This paper describes an active-stall wind turbine controller. The objective is to develop a general model of an active stall controller in order to simulate the operation of grid connected active stall wind turbines. The active stall turbine concept and its control strategies are presented and evaluated by simulations. The presented controller is described for continuous operation under all wind speeds from start-up wind speed to shut down wind speed. Due to its parametric implementation it is general i. e. it can represent different active stall wind turbine controllers and can be implemented in different simulation tools. (author)

  5. A comparison of two methods of teaching. Computer managed instruction and keypad questions versus traditional classroom lecture.

    Science.gov (United States)

    Halloran, L

    1995-01-01

    Computers increasingly are being integrated into nursing education. One method of integration is through computer managed instruction (CMI). Recently, technology has become available that allows the integration of keypad questions into CMI. This brings a new type of interactivity between students and teachers into the classroom. The purpose of this study was to evaluate differences in achievement between a control group taught by traditional classroom lecture (TCL) and an experimental group taught using CMI and keypad questions. Both control and experimental groups consisted of convenience samples of junior nursing students in a baccalaureate program taking a medical/surgical nursing course. Achievement was measured by three instructor-developed multiple choice examinations. Findings demonstrated that although the experimental group demonstrated increasingly higher test scores as the semester progressed, no statistical difference was found in achievement between the two groups. One reason for this may be phenomenon of vampire video. Initially, the method of presentation overshadowed the content. As students became desensitized to the method, they were able to focus and absorb more content. This study suggests that CMI and keypads are a viable teaching option for nursing education. It is equal to TCL in student achievement and provides a new level of interaction in the classroom setting.

  6. MANAGING MULTIPLE ACTIVITIES FOR SPECIFIC THEMES IN THE EFL CLASSROOM (PREK-GRADE 2

    Directory of Open Access Journals (Sweden)

    Hughes M. Terry

    2002-08-01

    Full Text Available The theory of Multiple Intelligences by Howard Gardner is enlightening and extremely useful in the EFL (English as a Foreign Language classroom. For starters it helps the teacher in understanding the individual differences found in the classroom and to comprehend how students go about learning. Multiple intelligences are not always taken into account even though they are very observable in children, since they are still so innocent and honest in their learning process. The purpose of this article is to discuss the importance of approaching the individuals encountered in our classroom, giving them the equal opportunity of learning another language and above all making our classes fun and resourceful so that these young learners are motivated for a lifetime.

  7. Flow and Noise Characteristics of Centrifugal Fan under Different Stall Conditions

    Directory of Open Access Journals (Sweden)

    Lei Zhang

    2014-01-01

    Full Text Available An implicit, time-accurate 3D Reynolds-averaged Navier-Stokes (RANS solver is used to simulate the rotating stall phenomenon in a centrifugal fan. The goal of the present work is to shed light on the flow field and particularly the aerodynamic noise at different stall conditions. Aerodynamic characteristics, frequency domain characteristics, and the contours of sound power level under two different stall conditions are discussed in this paper. The results show that, with the decrease of valve opening, the amplitude of full pressure and flow fluctuations tends to be larger and the stall frequency remains the same. The flow field analysis indicates that the area occupied by stall cells expands with the decrease of flow rate. The noise calculation based on the simulation underlines the role of vortex noise after the occurrence of rotating stall, showing that the high noise area rotates along with the stall cell in the circumferential direction.

  8. Managed airing behaviour and the effect on pupil perceptions and indoor climate in classrooms

    DEFF Research Database (Denmark)

    Toftum, Jørn; Wohlgemuth, Mette Malene; Christensen, Ulrik Sloth

    2016-01-01

    scenarios used two different window opening schedules. Measurements of CO2, temperature and periods with open windows were recorded, and pupils expressed their perception of the indoor environment in the classroom. With a visual CO2 display unit in the classroom, pupils were able to modify their behavior...... and reduce by approximately 40-60% the duration when the CO2 concentration was above 1000 ppm. With only scheduled window opening, a similar improvement was not observed. Although not significant, pupils’ perception of the air quality seemed better when the intervention was running, but they also perceived...

  9. A Comparative Study of Elementary Teachers' Beliefs and Strategies on Classroom and Behavior Management in the USA and Korean School Systems

    Science.gov (United States)

    Koh, Myung-sook; Shin, Sunwoo

    2014-01-01

    The purpose of this cross-cultural study is to investigate elementary teachers' beliefs and inter-cultural perspectives in classroom management (instructional environment and behavior management) for students in public schools of the U.S. and Korea. The results supported that the two groups of teachers showed similar beliefs in instructional…

  10. DYNSTALL: Subroutine package with a dynamic stall model

    Energy Technology Data Exchange (ETDEWEB)

    Bjoerck, Anders [Aeronautical Research Inst. of Sweden, Bromma (Sweden)

    2001-03-01

    A subroutine package, called DYNSTALL, for the calculation of 2D unsteady airfoil aerodynamics is described. The subroutines are written in FORTRAN. DYNSTALL is basically an implementation of the Beddoes-Leishman dynamic stall model. This model is a semi-empirical model for dynamic stall. It includes, however, also models for attached flow unsteady aerodynamics. It is complete in the sense that it treats attached flow as well as separated flow. Semi-empirical means that the model relies on empirically determined constants. Semi because the constants are constants in equations with some physical interpretation. It requires the input of 2D airfoil aerodynamic data via tables as function of angle of attack. The method is intended for use in an aeroelastic code with the aerodynamics solved by blade/element method. DYNSTALL was written to work for any 2D angles of attack relative to the airfoil, e.g. flow from the rear of an airfoil.

  11. Serving culturally diverse learners in the 24/7 management classroom

    NARCIS (Netherlands)

    van de Bunt-Kokhuis, S.G.M.; Weir, D.

    2013-01-01

    Purpose: The purpose of this paper is to highlight how future teaching in business schools will probably take place in an online (here called 24/7) classroom, where culturally diverse e-learners around the globe meet. Technologies such as iPhone, iPad and a variety of social media, to mention but a

  12. A Case Study in Classroom Management and School Involvement: Designing an Art Room for Effective Learning

    Science.gov (United States)

    Broome, Jeffrey L.

    2013-01-01

    The purpose of this research project is to investigate the design of classroom environments through the lens of a uniquely selected art educator. More specifically, the purpose is to use case study methodology (Stake, 1995) to characterize the resulting instructional experiences for an art educator who had the unique opportunity to collaborate…

  13. Study and Control of a Radial Vaned Diffuser Stall

    Directory of Open Access Journals (Sweden)

    Aurélien Marsan

    2012-01-01

    Full Text Available The aim of the present study is to evaluate the efficiency of a boundary layer suction technique in case of a centrifugal compressor stage in order to extend its stable operating range. First, an analysis of the flow pattern within the radial vaned diffuser is presented. It highlights the stall of the diffuser vanes when reaching a low massflow. A boundary layer separation in the hub-suction side corner grows when decreasing the massflow from the nominal operating point to the surge and finally leads to a massive stall. An aspiration strategy is investigated in order to control the stall. The suction slot is put in the vicinity of the saddle that originates the main separating skin-friction line, identified thanks to the analysis of the skin-friction pattern. Several aspiration massflow rates are tested, and two different modelings of the aspiration are evaluated. Finally, an efficient control is reached with a removal of only 0,1% of the global massflow and leads—from a steady-state calculations point of view—to an increase by 40% of the compressor operating range extent.

  14. Vorticity Transport on a Flexible Wing in Stall Flutter

    Science.gov (United States)

    Akkala, James; Buchholz, James; Farnsworth, John; McLaughlin, Thomas

    2014-11-01

    The circulation budget within dynamic stall vortices was investigated on a flexible NACA 0018 wing model of aspect ratio 6 undergoing stall flutter. The wing had an initial angle of attack of 6 degrees, Reynolds number of 1 . 5 ×105 and large-amplitude, primarily torsional, limit cycle oscillations were observed at a reduced frequency of k = πfc / U = 0 . 1 . Phase-locked stereo PIV measurements were obtained at multiple chordwise planes around the 62.5% and 75% spanwise locations to characterize the flow field within thin volumetric regions over the suction surface. Transient surface pressure measurements were used to estimate boundary vorticity flux. Recent analyses on plunging and rotating wings indicates that the magnitude of the pressure-gradient-driven boundary flux of secondary vorticity is a significant fraction of the magnitude of the convective flux from the separated leading-edge shear layer, suggesting that the secondary vorticity plays a significant role in regulating the strength of the primary vortex. This phenomenon is examined in the present case, and the physical mechanisms governing the growth and evolution of the dynamic stall vortices are explored. This work was supported by the Air Force Office of Scientific Research through the Flow Interactions and Control Program monitored by Dr. Douglas Smith, and through the 2014 AFOSR/ASEE Summer Faculty Fellowship Program (JA and JB).

  15. Simulasi Numerik Dynamic Stall Pada Airfoil Yang Berosilasi

    Directory of Open Access Journals (Sweden)

    Galih S.T.A. Bangga

    2012-09-01

    Full Text Available Kebutuhan analisa pada sudu helikopter, kompresor, kincir angin dan struktur streamline lainya yang beroperasi pada angle of attack yang tinggi dan melibatkan instationary effects yang disebut dynamic stall menjadi semakin penting. Fenomena ini ditandai dengan naiknya dynamic lift melewati static lift maksimum pada critical static stall angle, vortex yang terbentuk pada leading edge mengakibatkan naiknya suction contribution yang kemudian terkonveksi sepanjang permukaan hingga mencapai trailling edge diikuti terbentuknya trailling edge vortex yang menunjukkan terjadinya lift stall. Fenomena ini sangat berbahaya terhadap struktur airfoil itu sendiri. Secara umum, beban fatique yang ditimbulkan oleh adanya efek histerisis karena fluktuasi gaya lift akibat induksi vibrasi lebih besar dibandingkan kondisi statis. Simulasi numerik dilakukan secara 2D dengan menggunakan profil Boeing-Vertol V23010-1.58 pada α0 = 14.92°. Standard-kω dan SST-kω digunakan sebagai URANS turbulence modelling. Model osilasi dari airfoil disusun dalam suatu user defined function (UDF. Gerakan meshing beserta airfoil diakomodasi dengan menggunakan dynamic mesh approach. Simulasi numerik menunjukkan bahwa, model SST-kω menunjukkan performa yang lebih baik dibandingkan dengan Standard-kω. Fenomena travelling vortex yang terjadi mampu ditangkap dengan baik, meski pada angle of attack yang tinggi URANS turbulence model gagal memprediksikan fenomena yang terjadi karena dominasi efek 3D.

  16. The Science Management Observation Protocol: Using Structured Observations to Improve Teachers' Management of Inquiry-Based Classrooms

    Science.gov (United States)

    Sampson, Victor

    2004-01-01

    With the publication of the National Science Education Standards and the Benchmarks for Science Literacy, people now have a thorough idea of what an inquiry-based teacher is, and what he or she needs to do within a classroom in order to be successful. However, one major barrier in learning how to become an effective inquiry-based science teacher…

  17. DAILY TIME BUDGET OF DAIRY COWS HOUSED IN TIE STALL BARNS, DURING TOTAL CONFINEMENT

    Directory of Open Access Journals (Sweden)

    D. GAVOJDIAN

    2009-10-01

    Full Text Available Although individual and social behavior of cattle has been studied extensively under pasture and loose housing conditions, similar behavioral data for partial or total confinement housing are limited. Essentially, the 24- h time budget represents the net response of a cow to her environment (Grant, 2003. Daily time budget was first introduced by Grant and Albright (in 2000 for cows housed in free-stall environment. Choices in stabling and management affect the behavior, health, longevity and performance of cows. Behavior while resting, eating, ruminating, urinating or defecating provides additional information about comfort. In the current study were used ten Romanian Black and White multiparous cows, housed in a tie stall barn 24 hours per day. Experiments were carried out during the cold season, in February 2008. Cows monitored were in their first hundred days of lactation. In our study cows spent resting on average 379.9 minutes (6.33 hours, value that represents 26.38 % from the days interval. Time devoted to feeding was on average 341.9 minutes (5.69 hours, in 17.5 periods. Rumination had place on average in 17.3 periods and a total time of 517.5 minutes (8.62 hours. Cows adopted lying position on average 581.2 minutes (40.36% from 24-h and standing position on average in 858.7 minutes (59.63% from 24-h.

  18. Internet-based virtual classroom and educational management software enhance students' didactic and clinical experiences in perfusion education programs.

    Science.gov (United States)

    Riley, Jeffrey B; Austin, Jon W; Holt, David W; Searles, Bruce E; Darling, Edward M

    2004-09-01

    A challenge faced by many university-based perfusion education (PE) programs is the need for student clinical rotations at hospital locations that are geographically disparate from the main educational campus. The problem has been addressed through the employment of distance-learning environments. The purpose of this educational study is to evaluate the effectiveness of this teaching model as it is applied to PE. Web-based virtual classroom (VC) environments and educational management system (EMS) software were implemented independently and as adjuncts to live, interactive Internet-based audio/video transmission from classroom to classroom in multiple university-based PE programs. These Internet environments have been used in a variety of ways including: 1) forum for communication between the university faculty, students, and preceptors at clinical sites, 2) didactic lectures from expert clinicians to students assigned to distant clinical sites, 3) small group problem-based-learning modules designed to enhance students analytical skills, and 4) conversion of traditional face-to-face lectures to asynchronous learning modules. Hypotheses and measures of student and faculty satisfaction, clinical experience, and learning outcomes are proposed, and some early student feedback was collected. For curricula that emphasize both didactic and clinical education, the use of Internet-based VC and EMS software provides significant advancements over traditional models. Recognized advantages include: 1) improved communications between the college faculty and the students and clinical preceptors, 2) enhanced access to a national network of clinical experts in specialized techniques, 3) expanded opportunity for student distant clinical rotations with continued didactic course work, and 4) improved continuity and consistency of clinical experiences between students through implementation of asynchronous learning modules. Students recognize the learning efficiency of on

  19. EFFECTIVE CLASSROOM MANAGEMENT AND STUDENTS’ ACADEMIC PERFORMANCE IN SECONDARY SCHOOLS IN UYO LOCAL GOVERNMENT AREA OF AKWA IBOM STATE

    Directory of Open Access Journals (Sweden)

    I. N GEORGE

    2017-06-01

    Full Text Available This study was carried out to investigate Effective Classroom Management and Students’ Academic Performance in Secondary schools in Uyo Local Government Area. Four research questions and four null hypotheses were formulated to guide the study. The survey design was adopted for the study. The population of 2044 Senior Secondary School One (SS1 students with a sample of 200 students selected from 5 public secondary schools in 4 clans within the study area. A researcher – made questionnaire was used to elicit data from respondents. The research instrument has a 4-point rating scale and 25 items based on the study variables. The Pearson Product Moment (PPM Correlation Coefficient of 0.94 ascertained the reliability of instrument for use in the study. After the administration, scoring and collation of the instrument, the data obtained were subjected to the chi-square (X2 analysis. All the null hypotheses were tested at 0.05 level of significance. Based on the result of this study, it is concluded that SS1 students in the public Secondary Schools in Uyo Local Government Area differ significantly in terms of academic performance based on verbal instruction, corporal punishment, instructional supervision, delegation of authority to learners. It is recommended that teachers should be skilled in classroom management so as to influence students’ academic performance positively.

  20. Prediction of dynamic loads and induced vibrations in stall

    Energy Technology Data Exchange (ETDEWEB)

    Thirstrup Petersen, J.; Aagaard Madsen, H. [Risoe National Lab. (Denmark); Bjoerck, A. [Aeronautical Research Inst. of Sweden (Sweden); Enevoldsen, P. [Bonus Energy A/S (Denmark); Oeye, S. [The Technical Univ. of Denmark (Denmark); Ganander, H. [Teknikgruppen AB (Sweden); Winkelaar, D. [Netherlands Energy Research Foundation (Netherlands)

    1998-05-01

    Results from research in an EC Joule-III project and from national projects are presented. The objectives are improvement of design methods for stall regulated wind turbines with emphasis on stall induced vibrations and dynamic stall. The primary concern is limitation of the edgewise vibrations in the fundamental blade natural mode shape, which have caused trouble on modern wind turbines of approximate size 500 kW nominal power and 40 m rotor diameter. A theoretical study of quasi-steady aerodynamics confirms that the vibrations are driven basically by energy supplied from the aerodynamic forces during stalled operation. This energy exchange is equivalent to negative aerodynamic damping. The theoretical approach identifies the main parameters controlling the phenomenon. These parameters describe the steady and the dynamic airfoil characteristics, the overall aerodynamic layout of the blade, e.g. chord length and twist, the structural properties of the blade, e.g. structural damping and properties controlling the resulting vibration direction. Furthermore, full aeroelastic calculations and comparison with measurements show that the properties of the supporting structure, i.e. the main shaft, the nacelle and the tower, are important, as the global vibration of the rotor on its support may exchange energy with the blade vibration, when the blade natural frequency is close to one of the frequencies of the coupled rotor tilt-yaw mode shapes, usually denoted the global rotor whirl frequencies. It is confirmed that the influence of changing the primary design parameters can be determined by use of qualified aeroelastic calculations. Presented design guidelines therefore build on both the simple quasi-steady models, which can be used for the preliminary choice of the design variables mentioned above, and on full aeroelastic calculations. The aeroelastic calculations refine the design basis and should be used for choosing the final design variables and for final

  1. Wider stall space affects behavior, lesion scores, and productivity of gestating sows.

    Science.gov (United States)

    Salak-Johnson, J L; DeDecker, A E; Levitin, H A; McGarry, B M

    2015-10-01

    Limited space allowance within the standard gestation stall is an important welfare concern because it restricts the ability of the sow to make postural adjustments and hinders her ability to perform natural behaviors. Therefore, we evaluated the impacts of increasing stall space and/or providing sows the freedom to access a small pen area on sow well-being using multiple welfare metrics. A total of 96 primi- and multiparous crossbred sows were randomly assigned in groups of 4 sows/treatment across 8 replicates to 1 of 3 stall treatments (TRT): standard stall (CTL; dimensions: 61 by 216 cm), width-adjustable stall (flex stall [FLX]; dimensions: adjustable width of 56 to 79 cm by 216 cm), or an individual walk-in/lock-in stall with access to a small communal open-pen area at the rear of the stall (free-access stall [FAS]; dimensions: 69 by 226 cm). Lesion scores, behavior, and immune and productivity traits were measured at various gestational days throughout the study. Total lesion scores were greatest for sows in FAS and least for sows in FLX ( pregnancy progressed, lesion scores increased among sows in CTL ( postural behaviors and sham chew behavior were affected by TRT ( changes in postural behaviors, lesion severity scores, and other sow traits. Moreover, compromised welfare measures found among sows in various stall environments may be partly attributed to the specific constraints of each stall system such as restricted stall space in CTL, insufficient floor space in the open-pen area of the FAS system, and gate design of the FLX (e.g., direction of bars and feeder space). These results also indicate that parity and gestational day are additional factors that may exacerbate the effects of restricted stall space or insufficient pen space, further compromising sow well-being.

  2. Classroom Management: A Persistent Challenge for Pre-Service Foreign Language Teachers (Manejo del salón de clase: un reto persistente para docentes practicantes de lenguas extranjeras)

    Science.gov (United States)

    Macías, Diego Fernando; Sánchez, Jesús Ariel

    2015-01-01

    This qualitative descriptive study aimed to ascertain the extent to which classroom management constituted a problem among pre-service foreign language teachers in a teacher education program at a public university in Colombia. The study also sought to identify classroom management challenges, the approaches to confronting them, and the…

  3. Examination of Teacher Knowledge, Dissemination Preferences, and Classroom Management of Student Concussions: Implications for Return-to-Learn Protocols.

    Science.gov (United States)

    Dreer, Laura E; Crowley, Maria T; Cash, Augusta; O'Neill, Jilian A; Cox, Molly K

    2017-05-01

    To determine teacher knowledge of (1) concussion symptomatology, (2) dissemination preferences, and (3) classroom management practices of student concussions. A cross-sectional survey assessing concussion-related information was completed by teachers/instructors in the state of Alabama. One-hundred and thirty participants completed the survey. Only a quarter perceived they were "very" or "extremely" confident enough to recognize signs related to a concussion (22.3%), and only 12.4% reported they were "very knowledgeable" about concussions. The majority were able to recognize more common concussion symptoms/challenges: headaches (95.4%), trouble concentrating (86.2%), memory (82.3%), balance problems/dizziness (82.3%), changes vision/hearing (76.2%), difficulty completing tasks (70.8%), difficulty making decisions (66.2%), changes in sleep (61.5%), and fatigue (60.8%); only half recognized emotional symptoms (e.g., mood) or symptoms associated with more prolonged recovery. Concussion informants were school nurses (74.4%), followed by parents (46.2%), students (46.2%), and coaches/athletic trainers (45.4%). A little under half of participants received concussion information as part of their job (41.9%). About 14.1% of teachers reported that someone had come to their school to talk with them as a group about concussions, and 82% felt they needed more information. Of the 37% who taught a concussed student, 83% reported they altered the classroom management strategies. In general, teachers were able to recognize the more commonly experienced concussion symptoms as well as management strategies. However, they appear to want greater concussion information and training. Given the daily influence of teachers on student tasks involving cognitive exertion, incorporation of formal concussion education for teachers is warranted.

  4. Precautions against axial fan stall in reactor building to Tianwan NPP

    International Nuclear Information System (INIS)

    Liu Chunlong; Pei Junmin

    2011-01-01

    The paper introduces the mechanism and harm of rotating stall of axial fans, analyzes the necessity for prevention against axial fan stall in reactor building of Tianwan NPP, introduces the precautions, and then makes an assessment on anti-stall effect of flow separators. It can provide reference for model-selection or reconstruction of similar fans in power stations, and for operation and maintenance of axial fans. (authors)

  5. Comparison of Different Stall Conditions in Axial Flow Compressor Using Analytic Wavelet Transform

    Directory of Open Access Journals (Sweden)

    Arshad Ali

    2017-12-01

    Full Text Available The rotating stall inception data analysis using Analytic Wavelet Transform (AWT in a low-speed axial compressor was presented in the authors’ previous studies [1], [2]. These studies focused on the detection of instability inception in an axial flow compressor when it enters into the instability regime due to the modal type of stall perturbation. In this paper, the effectiveness of AWT is further studied by applying it under different testing conditions. In order to examine the results of AWT on highly sampled data, at first, the stall data were acquired at a high sampling frequency and the results were compared with the conventional filtered signals. Secondly, the AWT analysis of stall data was carried out for the condition when compressor experienced a spike type rotating stall disturbance. The stall inception information obtained from the AWT analysis was then compared with the commonly used stall detection techniques. The results show that AWT is equally beneficial for the diagnostic of compressor instability regardless of the data sampling rate and represents an outstanding ability to detect stall disturbance irrespective of the type of stall precursor, i.e. the modal wave or spike.

  6. Enhancing BEM simulations of a stalled wind turbine using a 3D correction model

    Science.gov (United States)

    Bangga, Galih; Hutomo, Go; Syawitri, Taurista; Kusumadewi, Tri; Oktavia, Winda; Sabila, Ahmad; Setiadi, Herlambang; Faisal, Muhamad; Hendranata, Yongki; Lastomo, Dwi; Putra, Louis; Kristiadi, Stefanus; Bumi, Ilmi

    2018-03-01

    Nowadays wind turbine rotors are usually employed with pitch control mechanisms to avoid deep stall conditions. Despite that, wind turbines often operate under pitch fault situation causing massive flow separation to occur. Pure Blade Element Momentum (BEM) approaches are not designed for this situation and inaccurate load predictions are already expected. In the present studies, BEM predictions are improved through the inclusion of a stall delay model for a wind turbine rotor operating under pitch fault situation of -2.3° towards stall. The accuracy of the stall delay model is assessed by comparing the results with available Computational Fluid Dynamics (CFD) simulations data.

  7. Numerical simulation of the RISOe1-airfoil dynamic stall

    Energy Technology Data Exchange (ETDEWEB)

    Bertagnolio, F.; Soerensen, N. [Risoe National Lab., Wind Energy and Atmospheric Physics Dept., Roskilde (Denmark)

    1997-12-31

    In this paper we are concerned with the numerical computation of the dynamic stall that occur in the viscous flowfield over an airfoil. These results are compared to experimental data that were obtained with the new designed RISOe1-airfoil, both for a motionless airfoil and for a pitching motion. Moreover, we present some numerical computations of the plunging and lead-lag motions. We also investigate the possibility of using the pitching motion to simulate the plunging and lead-lag situations. (au)

  8. El departamento musical Disney : las Silly Symphonies y Carl Stalling

    OpenAIRE

    Duarte del Moral, Marina

    2014-01-01

    La historia de la animación tiene un nombre propio: Walt Disney. Gracias a su experimentación en diversos campos de esta materia, Disney consigue desarrollar la animación y su universo de una forma perseverante y continua, adaptándose a los diversos cambios producidos desde el nacimiento de ésta, reinventando una y otra vez el sector y añadiendo su toque mágico a la personalidad de cada personaje y cada obra. En este camino no está solo gracias al trabajo de genios como Carl Stalling, que apo...

  9. FBH1 Catalyzes Regression of Stalled Replication Forks

    DEFF Research Database (Denmark)

    Fugger, Kasper; Mistrik, Martin; Neelsen, Kai J

    2015-01-01

    DNA replication fork perturbation is a major challenge to the maintenance of genome integrity. It has been suggested that processing of stalled forks might involve fork regression, in which the fork reverses and the two nascent DNA strands anneal. Here, we show that FBH1 catalyzes regression......, is required for early phosphorylation of ATM substrates such as CHK2 and CtIP as well as hyperphosphorylation of RPA. These phosphorylations occur prior to apparent DNA double-strand break formation. Furthermore, FBH1-dependent signaling promotes checkpoint control and preserves genome integrity. We propose...

  10. Use of Praise and Reprimands as Critical Ingredients of Teacher Behavior Management: Effects on Children's Development in the Context of a Teacher-Mediated Classroom Intervention.

    Science.gov (United States)

    Spilt, Jantine L; Leflot, Geertje; Onghena, Patrick; Colpin, Hilde

    2016-08-01

    This intervention study examined teachers' use of verbal praise and reprimands as specific components of teacher behavior management that can promote children's development in schools. The impact of teacher praise and reprimands on children's development was examined in the context of a teacher-mediated, classroom intervention. The sample involved 570 children and 30 teachers from second grade classrooms in 15 primary schools. The Good Behavior Game was implemented in half of the classrooms based on random assignment within schools. Teacher behavior management (praise for appropriate behavior and reprimands for inappropriate behavior) was observed during regular classroom lessons. Hyperactive, disruptive, and withdrawn child behavior were assessed using teacher and peer reports, global self-concept and emotional engagement were assessed using child self-reports. All variables were assessed at the beginning (pre-test) and at the end (post-test) of the school year. Multilevel regression models accounted for the nested structure of the data. The results suggested positive effects of fewer reprimands and more praise on child outcomes (except emotional school engagement), although the results differed by informant. We also found indirect effects of the Good Behavior Game (GBG) on child outcomes via teacher praise and reprimands. Overall, the study suggests that teachers' use of praise and reprimands is a malleable classroom factor that influences children's behavioral and socio-emotional development.

  11. Appreciating the Complexity of Project Management Execution: Using Simulation in the Classroom

    Science.gov (United States)

    Hartman, Nathan S.; Watts, Charles A.; Treleven, Mark D.

    2013-01-01

    As the popularity and importance of project management increase, so does the need for well-prepared project managers. This article discusses our experiences using a project management simulation in undergraduate and MBA classes to help students better grasp the complexity of project management. This approach gives students hands-on experience with…

  12. Investigation of Teachers' Verbal and Non-Verbal Strategies for Managing Attention Deficit Hyperactivity Disorder (ADHD) Students' Behaviours within a Classroom Environment

    Science.gov (United States)

    Geng, Gretchen

    2011-01-01

    This paper investigated teachers' verbal and non-verbal strategies for managing ADHD students in a classroom environment. It was found that effective verbal and non-verbal strategies included voice control, short phrases, repeated instructions, using students' names, and visual cues and verbal instructions combined. It has been found that…

  13. Characterization of Mathematics Instructional Practises for Prospective Elementary Teachers with Varying Levels of Self-Efficacy in Classroom Management and Mathematics Teaching

    Science.gov (United States)

    Lee, Carrie W.; Walkowiak, Temple A.; Nietfeld, John L.

    2017-01-01

    The purpose of this study was to investigate the relationship between prospective teachers' (PTs) instructional practises and their efficacy beliefs in classroom management and mathematics teaching. A sequential, explanatory mixed-methods design was employed. Results from efficacy surveys, implemented with 54 PTs were linked to a sample of…

  14. A Tale from Three Countries: The Classroom Management Practices of Pre-Service Teachers from Australia, Canada and the United Kingdom

    Science.gov (United States)

    Woodcock, Stuart; Reupert, Andrea

    2017-01-01

    The purpose of this research was to (i) identify Australian, Canadian and United Kingdom (UK) pre-service teachers' use, confidence and success of various classroom management strategies and (ii) to ascertain any significant differences between the three cohorts. Significant differences were found amongst the cohort with the UK pre-service…

  15. Primary School Environment Trend, Class-Ratio and Head Teachers Overcrowded Classrooms Management Strategies in Northern Senatorial District of Ondo State, Nigeria

    Science.gov (United States)

    Babatunde, Ehinola Gabriel

    2015-01-01

    Primary school Enrolment Trend, Class-Ratio and Head Teachers overcrowded classrooms management strategies in Northern Senatorial District of Ondo State, Nigeria was investigated. The purpose of the study is to examine the current enrolment trend in public primary schools in northern senatorial District of Ondo State. Also, is to ascertain the…

  16. Effects of a Tailored Incredible Years Teacher Classroom Management Programme on On-Task Behaviour of School Children with ADHD in Addis Ababa

    Science.gov (United States)

    Mohammed, Feruz

    2018-01-01

    Attention-Deficit/Hyperactivity Disorder (ADHD) is a persistent pattern of behaviours characterized by inattention, hyperactivity and impulsivity. This study evaluates the effects of a tailored Incredible Years Teacher Classroom Management (IYTCM) programme aimed to improve participating children's on-task behaviour in a group of 6 to 10 year old…

  17. Benchmarking welfare indicators in 73 free-stall dairy farms in north-western Spain

    Science.gov (United States)

    Trillo, Yolanda; Quintela, Luis Angel; Barrio, Mónica; Becerra, Juan José; Peña, Ana Isabel; Vigo, Marcos; Garcia Herradon, Pedro

    2017-01-01

    The aim of this study was to describe the status of body condition score (BCS), hock injuries prevalence, locomotion and body hygiene score as animal welfare measures in 73 free-stall dairy cattle farms in Lugo (Spain). A benchmarking process was established across farms: (1) the animal-based indicators were ordered from low to high values; (2) The farms were classified into three categories based on the number of indicators within less than the 25th percentile, 25th to 75th percentile and above the 75th percentile. The median prevalence of unsuitable BCS, hock injuries and clinical lameness was (median (range)) 51.7 per cent (13.3 to 89.5 per cent), 40.0 per cent (7.0per cent to 100 per cent) and 9.0 per cent (0per cent to 60.0 per cent) respectively. The dirtiness of the cow’s coat had a high prevalence (73.0 per cent (37.5per cent to 100 per cent)). Most farms did not display consistently good or poor animal-based indicators and each farm had its own set of strong and weak points. Moreover, facilities design and management practices were described to understand source of the observations made of the cows. The incidence of overstocking was 31.5 per cent for stalls and 26.0 per cent for headlocks. The front lunge space was reduced (farms and they could benefit from others by changing management practices related to facilities and herds. PMID:29018530

  18. The relationship among teacher classroom management behavior, student engagement, and student achievement of middle and high school science students of varying aptitude

    Science.gov (United States)

    McGarity, John R., Jr.; Butts, David P.

    This study was designed to determine the relationship among teacher classroom management behavior, student engagement, and student achievement of middle and high school science students. These variables were investigated across varying levels of academic aptitude. Two week long units were taught by 30 experienced science teachers. During this period of time teacher classroom management behavior, student achievement (n = 570), student engagement (n = 269), and student academic aptitude (n = 649) were measured. Twelve selected management indicators from Georgia Teachers Performance Assessment Indicators (TPAI) were used to measure teacher classroom management behaviors. Regression analysis was used to determine the relationship between the variables, and appropriate post hoc procedures were used. Analyses showed that there was a significant relationship among all variables. Post hoc analysis showed that these results were consistent across levels of aptitude. Other relationships found were between student engagement and achievement, student aptitude and achievement, and student aptitude and engagement. Correlation coefficients were obtained for each individual management indicators. Those particular management behaviors which were correlated with achievement and engagement are: identifies students who do not understand directions and helps them individually, maintains learner involvement in lessons, reinforces and encourages the efforts of learners to maintain involvement, attends to routine tasks, uses instructional time efficiently, provides feedback to learners about their behavior, manages disruptive behavior among learners.

  19. [General practice of pedagogic management by teachers of hyperkinetic attention deficit disordered children in the classroom].

    Science.gov (United States)

    Frölich, Jan; Döpfner, Manfred; Biegert, Hans; Lehmkuhl, Gerd

    2002-01-01

    Attention Deficit/Hyperactivity Disorder is one of the most common behavior disorders in child and adolescent psychiatry. The problems resulting from the core symptoms of the disorder often endure into adolescence and adulthood placing these children at significant long-term risk for academic psychological and social morbidity. Despite the importance of the school in this process relatively few teachers of regular schools have sufficient knowledge about the foundations and principles of treatment concerning ADHD nor do they receive adequate training how to deal with ADHD related problems in the classroom. Moreover there is a significant lack of cooperation between schools, parents and therapeutic institutions inhibiting a multimodal treatment. This article resumes the experiences of a 3 months ADHD intervention program for teachers in a Cologne elementary school. It gives informations and advices for appropriate measurements in the classroom setting that include: 1. intensive information of teachers about the disorder, 2. intensified involvement of teachers in the treatment process and 3. the implementation of distinct didactic elements and well structured principles of behavior therapy in the school lessons.

  20. The FFA dynamic stall model. The Beddoes-Leishman dynamic stall model modified for lead-lag oscillations

    Energy Technology Data Exchange (ETDEWEB)

    Bjoerck, A. [FFA, The Aeronautical Research Institute of Sweden, Bromma (Sweden)

    1997-08-01

    For calculations of the dynamics of wind turbines the inclusion of a dynamic stall model is necessary in order to obtain reliable results at high winds. For blade vibrations in the lead-lag motion the velocity relative to the blade will vary in time. In the present paper modifications to the Beddoes-Leishman model is presented in order to improve the model for calculations of cases with a varying relative velocity. Comparisons with measurement are also shown and the influence on the calculated aerodynamic damping by the modifications are investigated. (au)

  1. A.C. Plasma Anemometer for Axial Compressor Stall Warning

    Science.gov (United States)

    Matlis, Eric; Cameron, Joshua; Morris, Scott; Corke, Thomas

    2007-11-01

    Compressor sections of turbo jet engines are subject to stall and surge as a result of flow instabilities that occur upstream of the compressor rotor. One of the instability modes that contributes to compressor surge is the so-called `spike' mode of stall inception. It has been shown that this mode of instability can be predicted before onset by performing real-time statistical auto-correlation measurements of the blade-passing pressure characteristic at the mid-chord location of the rotor. These measurements are performed with pressure sensors or hot-wires that are too fragile for a full-scale compressor. We have developed a sensor that can survive the vibration and temperatures of a full-scale rig while providing the bandwidth necessary to resolve the blade passage signature required by this coherence technique. This sensor, called the Plasma Anemometer, provides high-bandwith point measurements of velocity or pressure fluctuations with unparalleled mechanical robustness and resistance to vibration and thermal effects.

  2. Learner-Centered (LCI) vs. Teacher-Centered (TCI) Instruction: A Classroom Management Perspective

    Science.gov (United States)

    Minter, Mary Kennedy

    2011-01-01

    Teacher education should incorporate management and leadership training with an emphasis on student audience analysis. Macro perspectives of teaching are needed for a workable approach to the management of education.

  3. Simulation of Entropy Generation under Stall Conditions in a Centrifugal Fan

    Directory of Open Access Journals (Sweden)

    Lei Zhang

    2014-06-01

    Full Text Available Rotating stalls are generally the first instability met in turbomachinery, before surges. This 3D phenomenon is characterized by one or more stalled flow cells which rotate at a fraction of the impeller speed. The goal of the present work is to shed some light on the entropy generation in a centrifugal fan under rotating stall conditions. A numerical simulation of entropy generation is carried out with the ANSYS Fluent software which solves the Navier-Stokes equations and user defined function (UDF. The entropy generation characteristics in the centrifugal fan for five typical conditions are presented and discussed, involving the design condition, conditions on occurrence and development of stall inception, the rotating stall conditions with two throttle coefficients. The results show that the entropy generation increases after the occurrence of stall inception. The high entropy generation areas move along the circumferential and axial directions, and finally merge into one stall cell. The entropy generation rate during circumferential propagation of the stall cell is also discussed, showing that the entropy generation history is similar to sine curves in impeller and volute, and the volute tongue has a great influence on entropy generation in the centrifugal fan.

  4. Why Do Some Teachers Change and Others Don't? A Review of Studies about Factors Influencing In-Service and Pre-Service Teachers' Change in Classroom Management

    Science.gov (United States)

    Girardet, Céline

    2018-01-01

    Considering the crucial goals dependent on classroom management, such as creating a classroom environment conducive to student learning and facilitating student engagement and motivation, it is an important skill for teachers to learn. Accordingly, this literature review aims at untangling the factors influencing the evolution of teachers'…

  5. Teachers' Views on the Impact of Classroom Management on Student Responsibility

    Science.gov (United States)

    Roache, Joel; Lewis, Ramon

    2011-01-01

    This article examines teachers' views of their management styles, classified as either "coercive" or "relationship"-based, for 145 primary and 363 secondary school teachers in Victoria, Australia. It finds that management that combines punishment with aggressive and hostile behaviour can exacerbate misbehaviour and increase…

  6. ABC Analysis for Inventory Management: Bridging the Gap between Research and Classroom

    Science.gov (United States)

    Ravinder, Handanhal; Misra, Ram B.

    2014-01-01

    ABC analysis is a well-established categorization technique based on the Pareto Principle for determining which items should get priority in the management of a company's inventory. In discussing this topic, today's operations management and supply chain textbooks focus on dollar volume as the sole criterion for performing the categorization. The…

  7. Optimal parameters for the FFA-Beddoes dynamic stall model

    Energy Technology Data Exchange (ETDEWEB)

    Bjoerck, A.; Mert, M. [FFA, The Aeronautical Research Institute of Sweden, Bromma (Sweden); Madsen, H.A. [Risoe National Lab., Roskilde (Denmark)

    1999-03-01

    Unsteady aerodynamic effects, like dynamic stall, must be considered in calculation of dynamic forces for wind turbines. Models incorporated in aero-elastic programs are of semi-empirical nature. Resulting aerodynamic forces therefore depend on values used for the semi-empiricial parameters. In this paper a study of finding appropriate parameters to use with the Beddoes-Leishman model is discussed. Minimisation of the `tracking error` between results from 2D wind tunnel tests and simulation with the model is used to find optimum values for the parameters. The resulting optimum parameters show a large variation from case to case. Using these different sets of optimum parameters in the calculation of blade vibrations, give rise to quite different predictions of aerodynamic damping which is discussed. (au)

  8. Proposed Chevron Tengiz venture stalls amid Soviet political squabble

    International Nuclear Information System (INIS)

    Anon.

    1991-01-01

    This paper reports on the status of foreign investment in Soviet oil and gas joint ventures which has reached a critical juncture. Just as the U.S. is considering granting most favored nation trade status to the U.S.S.R., the joint venture petroleum deal seen as the litmus test for such deals-Chevron Corp.'s proposed addition of supergiant Tengiz oil field to its Caspian Sea joint venture-has stalled amid controversy. Unconfirmed reports from Soviet officials and other foreign joint venture participants in the U.S.S.R. have Chevron pulling out of the long negotiated, multibillion dollar project after the Soviets rejected the company's terms. Chevron, however, insists the project is still alive

  9. Management of Truncated Data in Speech Transmission Evaluation for Pupils in Classrooms

    Science.gov (United States)

    Genta, G.; Astolf, A.; Bottalico, P.; Barbato, G.; Levi, R.

    2013-04-01

    Speech intelligibility is a subjective performance index defined as the percentage of a message understood correctly. Often the results of speech intelligibility tests would suggest that conditions are acceptable, with Intelligibility Score (IS) of the order of 90% or more, while speech transmission performance may not be satisfactory. Subjective ratings of the Listening Easiness Score (LES), based on a discrete questionnaire, provide an alternative approach. A total of 239 primary school pupils, aged 7 to 11, evenly distributed among the grades, participated in the survey. The objective indicator Speech Transmission Index (STI) was also measured for each test setting in seven different positions in the laboratory classroom used for the test. Both IS and LES are inherently bounded, and their data distributions exhibit a significant accumulation of scores in the upper and lower parts. The resulting truncation problem has been addressed with a method based on the normal probability plot, enabling identification of mathematical models relating IS and LES to STI, as well as the estimation of related uncertainties. IS and LES exhibit substantially similar metrological capabilities, as, for both, model relative uncertainty does not exceed 4% and uncertainties in prediction of new observations are about twice as large.

  10. From Tourists to Citizens in the Classroom.

    Science.gov (United States)

    Freiberg, H. Jerome

    1996-01-01

    Too often, classroom-management systems built on trust and support in primary grades are replaced by compliance and obedience systems in higher grades. Consistency Management and Cooperative Discipline is a research-based, classroom-tested Texas program that combines instructional effectiveness (through consistent classroom organization) with…

  11. Analysis of Low Speed Stall Aerodynamics of a Swept Wing with Laminar Flow Glove

    Science.gov (United States)

    Bui, Trong T.

    2014-01-01

    Reynolds-Averaged Navier-Stokes (RANS) computational fluid dynamics (CFD) analysis was conducted to study the low-speed stall aerodynamics of a GIII aircraft's swept wing modified with a laminar-flow wing glove. The stall aerodynamics of the gloved wing were analyzed and compared with the unmodified wing for the flight speed of 120 knots and altitude of 2300 ft above mean sea level (MSL). The Star-CCM+ polyhedral unstructured CFD code was first validated for wing stall predictions using the wing-body geometry from the First American Institute of Aeronautics and Astronautics (AIAA) CFD High-Lift Prediction Workshop. It was found that the Star-CCM+ CFD code can produce results that are within the scattering of other CFD codes considered at the workshop. In particular, the Star-CCM+ CFD code was able to predict wing stall for the AIAA wing-body geometry to within 1 degree of angle of attack as compared to benchmark wind-tunnel test data. Current results show that the addition of the laminar-flow wing glove causes the gloved wing to stall much earlier than the unmodified wing. Furthermore, the gloved wing has a different stall characteristic than the clean wing, with no sharp lift drop-off at stall for the gloved wing.

  12. Analysis of Low-Speed Stall Aerodynamics of a Swept Wing with Laminar-Flow Glove

    Science.gov (United States)

    Bui, Trong T.

    2014-01-01

    Reynolds-Averaged Navier-Stokes (RANS) computational fluid dynamics (CFD) analysis was conducted to study the low-speed stall aerodynamics of a GIII aircraft's swept wing modified with a laminar-flow wing glove. The stall aerodynamics of the gloved wing were analyzed and compared with the unmodified wing for the flight speed of 120 knots and altitude of 2300 ft above mean sea level (MSL). The Star-CCM+ polyhedral unstructured CFD code was first validated for wing stall predictions using the wing-body geometry from the First American Institute of Aeronautics and Astronautics (AIAA) CFD High-Lift Prediction Workshop. It was found that the Star-CCM+ CFD code can produce results that are within the scattering of other CFD codes considered at the workshop. In particular, the Star-CCM+ CFD code was able to predict wing stall for the AIAA wing-body geometry to within 1 degree of angle of attack as compared to benchmark wind-tunnel test data. Current results show that the addition of the laminar-flow wing glove causes the gloved wing to stall much earlier than the unmodified wing. Furthermore, the gloved wing has a different stall characteristic than the clean wing, with no sharp lift drop-off at stall for the gloved wing.

  13. Investigating Stall Flutter using a DS model-An application for HAWTs

    International Nuclear Information System (INIS)

    Nichols, James; Haans, Wouter; Witcher, David; Attorni, Andrea

    2014-01-01

    As wind turbine blades become larger there is a tendency for the blade torsional stiffness to reduce, producing the possibility of dynamic instability at moderate windspeeds. While linearised methods can assess the envelope of allowable blade properties for avoiding classical flutter with attached flow aerodynamics, wind turbine aerofoils can experience stalled flow. Therefore, it is necessary to explore the possible effects of stall-flutter on blade stability. This paper aims to address methods for judging the stability of blade designs during both attached flow and stalled flow behaviour. This paper covers the following areas: i) Attached flow model A Beddoes-Leishman indicial model is presented and the choice of coefficients is explained in the context of Theodorsen's theory for flat-plate aerofoils and experimental results by Beddoes and Leishman. Special attention is given to the differing dynamic behaviour of the pitching moment due to flapping motion, pitching motion and dynamically varying inflow. (ii) Classical flutter analysis The time domain attached flow model is verified against a linear flutter analysis by comparing time domain results for a 3D model of a representative multi-megawatt turbine blade, varying the position of the centre of mass along the chord. The results show agreement to within 6% for a range of flutter onset speeds. (iii) Dynamic stall model On entering the stalled region, damping of torsional motion of an aerofoil section can become negative. A dynamic stall model which encompasses the effects of trailing edge separation and leading edge vortex detachment is presented and validated against published experimental data. (iv) Stall flutter The resulting time domain model is used in simulations validating the prediction of reduced flutter onset for stalled aerofoils. Representative stalled conditions for a multi-megawatt wind turbine blade are investigated to assess the possible reduction in flutter speed. A maximum reduction of 17

  14. Perceived Importance and Manageability of Teachers toward the Factors of Integrating Computer Technology into Classrooms

    Science.gov (United States)

    ChanLin, Lih-Juan

    2007-01-01

    In this study, the perceived importance and manageability of teachers on the factors in technology integration were assessed among 407 elementary and secondary schoolteachers. A questionnaire containing 28 items focusing on environmental, personal, social and curricular factors related to technology integration was used. Two sets of data resources…

  15. Student Management Teams Increase College Students' Feelings of Autonomy in the Classroom

    Science.gov (United States)

    Troisi, Jordan D.

    2015-01-01

    The use of Student Management Teams (SMTs) is a relatively new teaching technique designed to increase students' motivation and involvement with the planning and execution of college courses. However, to date, little systematic, empirical research has validated the effectiveness of using SMTs. To test the effectiveness of this technique, the…

  16. Measuring Teacher Classroom Management Skills: A Comparative Analysis of Distance Trained and Conventional Trained Teachers

    Science.gov (United States)

    Henaku, Christina Bampo; Pobbi, Michael Asamani

    2017-01-01

    Many researchers and educationist remain skeptical about the effectiveness of distance learning program and have termed it as second to the conventional training method. This perception is largely due to several challenges which exist within the management of distance learning program across the country. The general aim of the study is compare the…

  17. Improving the Process of Education: Total Quality Management for the College Classroom.

    Science.gov (United States)

    Gilbert, James P.; And Others

    1993-01-01

    A systematic, institutional approach to continuous improvement in college instruction is outlined, based on the four main elements of Total Quality Management: quality defined by customer; top leadership responsibility; systematic analysis of work processes; and continuous quality improvement throughout the organization. Definitions and dimensions…

  18. Analysis of Low-Speed Stall Aerodynamics of a Business Jets Wing Using STAR-CCM+

    Science.gov (United States)

    Bui, Trong

    2016-01-01

    Reynolds-Averaged Navier-Stokes (RANS) computational fluid dynamics (CFD) analysis was conducted: to study the low-speed stall aerodynamics of a GIII aircrafts swept wing modified with (1) a laminar-flow wing glove, or (2) a seamless flap. The stall aerodynamics of these two different wing configurations were analyzed and compared with the unmodified baseline wing for low-speed flight. The Star-CCM+ polyhedral unstructured CFD code was first validated for wing stall predictions using the wing-body geometry from the First AIAA CFD High-Lift Prediction Workshop.

  19. Barriers and facilitators for taking action after classroom-based crew resource management training at three ICUs.

    Science.gov (United States)

    Kemper, Peter E; van Dyck, Cathy; Wagner, Cordula; Wouda, Lara; de Bruijne, Martine

    2014-07-01

    Given growing awareness of the crucial role of nontechnical skills in providing safe patient care, crew resource management (CRM) training is being increasingly used to improve them. Implementing the plans of action that are formulated during CRM training may constitute an important first step in the successful uptake of skills. Accordingly, understanding the factors that determine why participants do or do not carry out those plans should help improve CRM training and enhance its impact. A study was conducted to examine the impact of pretraining readiness factors and posttraining barriers and facilitators on follow-up on plans of action. Three ICUs, each at a different nonacademic teaching hospital in The Netherlands, received two-day classroom-based CRM training in 2010. During the training, new ideas for safety initiatives were documented as concrete plans of action. All plans were categorized as individual (for example, "Always ask a colleague to double-check your medication"), team, or organizational. Two months before and three months after the CRM training, all ICU employees were asked to fill out a set of questionnaires. Management support for patient safety before the training was a positive determinant of the number of perceived facilitators. A significant relationship was found between the perceived barriers and facilitators after CRM training and Taking Action. More barriers were negatively associated, while more facilitators were positively associated, with Taking Action. When assessed separately, none of the readiness factors were significantly associated with taking action, while when assessed together, the readiness factors were positive related to Taking Action. To overcome the barriers and profit from the facilitators, they should be considered during the training and in regular CRM meetings afterward.

  20. Stalling HIV through social marketing: prospects in Pakistan.

    Science.gov (United States)

    Husain, Sara; Shaikh, Babar T

    2005-07-01

    Over the last two decades HIV/AIDS has evolved from a series of interesting case-reports to a growing epidemic that threatens the entire world. It is feared to cause devastation among large pockets of populations and may roll back more than thirty years of public health achievements. This killer disease has been more amenable to behavioral change than by provision of curative services and attempts are being made to educate the public about this threat. Various techniques of promotion have been tried through out the world including television dramas/soaps, mass media and school curricula. Social marketing is an evolving strategy used to influence human behavior and choices. By using the principles of marketing and promoting behavior as a product, social marketers attempt to understand the dynamics of human behaviour and devise messages and products to change, modify, accept or reject unsafe behaviors or practices. Thus, social marketers provide an effective force to combat the spread of HIV and may serve to be invaluable allies in health promotion efforts. In a complex and diversified cultural milieu of Pakistan, social marketing can have a significant impact on health determinants and the conditions that will facilitate the adoption of health-oriented behaviors and practices. This paper gives an account of the elements needed for the success of a health promotion strategy adopted in a developing country and makes a case for social marketing to be adopted as the lead strategy for stalling HIV/AIDS in Pakistan.

  1. Initial design of a stall-controlled wind turbine rotor

    Energy Technology Data Exchange (ETDEWEB)

    Nygaard, T.A. [Inst. for Energiteknikk, Kjeller (Norway)

    1997-08-01

    A model intended for initial design of stall-controlled wind turbine rotors is described. The user specifies relative radial position of an arbitrary number of airfoil sections, referring to a data file containing lift-and drag curves. The data file is on the same format as used in the commercial blade-element code BLADES-/2/, where lift- and drag coefficients are interpolated from tables as function of Reynolds number, relative thickness and angle of attack. The user can set constraints on a selection of the following: Maximum power; Maximum thrust in operation; Maximum root bending moment in operation; Extreme root bending moment, parked rotor; Tip speed; Upper and lower bounds on optimisation variables. The optimisation variables can be selected from: Blade radius; Rotational speed; Chord and twist at an arbitrary number of radial positions. The user can chose linear chord distribution and a hyperbola-like twist distribution to ensure smooth planform and twist, or cubic spline interpolation for one or both. The aerodynamic model is based on classical strip theory with Prandtl tip loss correction, supplemented by empirical data for high induction factors. (EG)

  2. Cow preference and usage of free stalls compared with an open pack area.

    Science.gov (United States)

    Fregonesi, J A; von Keyserlingk, M A G; Weary, D M

    2009-11-01

    Free-stall housing systems are designed to provide a comfortable and hygienic lying area, but some aspects of stall design may restrict usage by cows. The aim of this study was to compare free-stall housing with a comparable lying area (open pack) without stall partitions. We predicted that cows would spend more time lying down and standing in the bedded area when provided access to an open pack than when in free stalls. We also predicted that cows would spend less time standing outside of the lying area and less time perching with the front 2 hooves in the lying area when using the open pack. Groups (n = 8) of 12 cows each were provided access to either the open pack or stalls. After a 7-d adaptation period, each group was tested sequentially in the 2 treatments for 3 d each. This no-choice phase was followed by an 8-d choice phase during which cows had simultaneous access to both treatments. During the no-choice phase, cows spent more time lying down (13.03 +/- 0.24 vs. 12.48 +/- 0.24 h/d) and standing with all 4 hooves in the bedded area (0.96 +/- 0.12 vs. 0.41 +/- 0.12 h/d) of the open pack than in the stalls. During the choice phase, cows spent more time lying down (7.20 +/- 0.29 vs. 5.86 +/- 0.29 h/d) and standing with all 4 hooves in the bedded area (0.58 +/- 0.07 vs. 0.12 +/- 0.07 h/d) of the open pack than in the stalls. In both the no-choice (1.66 +/- 0.24 vs. 0.55 +/- 0.24 h/d) and choice (0.55 +/- 0.07 vs. 0.29 +/- 0.07 h/d) phases, cows spent more time standing with just 2 hooves in the stalls than in the open pack. In conclusion, cows spent more time lying and standing with all 4 hooves in the bedded open pack than in the stalls. Additionally, cows spent more time standing in the alley and standing with just the front 2 hooves on the bedding in the stalls than in the bedded open pack; increased standing time on wet concrete is a known risk factor for lameness.

  3. Dynamic stall characterization using modal analysis of phase-averaged pressure distributions

    Science.gov (United States)

    Harms, Tanner; Nikoueeyan, Pourya; Naughton, Jonathan

    2017-11-01

    Dynamic stall characterization by means of surface pressure measurements can simplify the time and cost associated with experimental investigation of unsteady airfoil aerodynamics. A unique test capability has been developed at University of Wyoming over the past few years that allows for time and cost efficient measurement of dynamic stall. A variety of rotorcraft and wind turbine airfoils have been tested under a variety of pitch oscillation conditions resulting in a range of dynamic stall behavior. Formation, development and separation of different flow structures are responsible for the complex aerodynamic loading behavior experienced during dynamic stall. These structures have unique signatures on the pressure distribution over the airfoil. This work investigates the statistical behavior of phase-averaged pressure distribution for different types of dynamic stall by means of modal analysis. The use of different modes to identify specific flow structures is being investigated. The use of these modes for different types of dynamic stall can provide a new approach for understanding and categorizing these flows. This work uses airfoil data acquired under Army contract W911W60160C-0021, DOE Grant DE-SC0001261, and a gift from BP Alternative Energy North America, Inc.

  4. High-Speed Experiments on Combustion-Powered Actuation for Dynamic Stall Suppression

    Science.gov (United States)

    Matalanis, Claude; Bowles, Patrick; Lorber, Peter; Crittenden, Thomas; Glezer, Ari; Schaeffler, Norman; Min, Byung-Young; Jee, Solkeun; Kuczek, Andrzej; Wake, Brian

    2016-01-01

    This work documents high-speed wind tunnel experiments conducted on a pitching airfoil equipped with an array of combustion-powered actuators (COMPACT). The main objective of these experiments was to demonstrate the stall-suppression capability of COMPACT on a high-lift rotorcraft airfoil, the VR-12, at relevant Mach numbers. Through dynamic pressure measurements at the airfoil surface it was shown that COMPACT can positively affect the stall behavior of the VR-12 at Mach numbers up to 0.4. Static airfoil results demonstrated 25% and 50% increases in post-stall lift at Mach numbers of 0.4 and 0.3, respectively. Deep dynamic stall results showed cycle-averaged lift coefficient increases up to 11% at Mach 0.4. Furthermore, it was shown that these benefits could be achieved with relatively few pulses during down-stroke and with no need to pre-anticipate the stall event. The flow mechanisms responsible for stall suppression were investigated using particle image velocimetry.

  5. Experimental Investigation of Stall Inception Mechanisms of Low Speed Contra Rotating Axial Flow Fan Stage

    Directory of Open Access Journals (Sweden)

    Tegegn Dejene Toge

    2015-01-01

    Full Text Available The present paper is an attempt in understanding the stall inception mechanism in a low speed, contra rotating axial flow fan stage, using wavelet transforms. The rotors used in this study have relatively large tip gap (about 3% of the blade span and aspect ratio of 3. The study was carried out near stall and at stall mass flow conditions for different speed ratios of rotor-2 to rotor-1. Unsteady pressure data from the casing wall mounted sensors are used to understand the stall inception mechanism. The wavelet transform clearly indicates that stall inception occurs mainly through long length scale disturbances for both rotors. It also reveals that short length disturbances occur simultaneously or intermittently in the case of rotor-1. The analysis shows the presence of a strong modal disturbance with 25–80% of the rotor frequency in the case of rotor-1 at the stall mass flow for all the speed combinations studied. The most interesting thing observed in the present study is that the frequency amplitude of the disturbance level is very small for both rotors.

  6. Effectiveness of classroom based crew resource management training in the intensive care unit: study design of a controlled trial

    Directory of Open Access Journals (Sweden)

    Kemper Peter F

    2011-11-01

    Full Text Available Abstract Background Crew resource management (CRM has the potential to enhance patient safety in intensive care units (ICU by improving the use of non-technical skills. However, CRM evaluation studies in health care are inconclusive with regard to the effect of this training on behaviour and organizational outcomes, due to weak study designs and the scarce use of direct observations. Therefore, the aim of this study is to determine the effectiveness and cost-effectiveness of CRM training on attitude, behaviour and organization after one year, using a multi-method approach and matched control units. The purpose of the present article is to describe the study protocol and the underlying choices of this evaluation study of CRM in the ICU in detail. Methods/Design Six ICUs participated in a paired controlled trial, with one pre-test and two post test measurements (respectively three months and one year after the training. Three ICUs were trained and compared to matched control ICUs. The 2-day classroom-based training was delivered to multidisciplinary groups. Typical CRM topics on the individual, team and organizational level were discussed, such as situational awareness, leadership and communication. All levels of Kirkpatrick's evaluation framework (reaction, learning, behaviour and organisation were assessed using questionnaires, direct observations, interviews and routine ICU administration data. Discussion It is expected that the CRM training acts as a generic intervention that stimulates specific interventions. Besides effectiveness and cost-effectiveness, the assessment of the barriers and facilitators will provide insight in the implementation process of CRM. Trial registration Netherlands Trial Register (NTR: NTR1976

  7. Effectiveness of classroom based crew resource management training in the intensive care unit: study design of a controlled trial.

    Science.gov (United States)

    Kemper, Peter F; de Bruijne, Martine; van Dyck, Cathy; Wagner, Cordula

    2011-11-10

    Crew resource management (CRM) has the potential to enhance patient safety in intensive care units (ICU) by improving the use of non-technical skills. However, CRM evaluation studies in health care are inconclusive with regard to the effect of this training on behaviour and organizational outcomes, due to weak study designs and the scarce use of direct observations. Therefore, the aim of this study is to determine the effectiveness and cost-effectiveness of CRM training on attitude, behaviour and organization after one year, using a multi-method approach and matched control units. The purpose of the present article is to describe the study protocol and the underlying choices of this evaluation study of CRM in the ICU in detail. Six ICUs participated in a paired controlled trial, with one pre-test and two post test measurements (respectively three months and one year after the training). Three ICUs were trained and compared to matched control ICUs. The 2-day classroom-based training was delivered to multidisciplinary groups. Typical CRM topics on the individual, team and organizational level were discussed, such as situational awareness, leadership and communication. All levels of Kirkpatrick's evaluation framework (reaction, learning, behaviour and organisation) were assessed using questionnaires, direct observations, interviews and routine ICU administration data. It is expected that the CRM training acts as a generic intervention that stimulates specific interventions. Besides effectiveness and cost-effectiveness, the assessment of the barriers and facilitators will provide insight in the implementation process of CRM. Netherlands Trial Register (NTR): NTR1976.

  8. Effectiveness of classroom based crew resource management training in the intensive care unit: study design of a controlled trial

    Science.gov (United States)

    2011-01-01

    Background Crew resource management (CRM) has the potential to enhance patient safety in intensive care units (ICU) by improving the use of non-technical skills. However, CRM evaluation studies in health care are inconclusive with regard to the effect of this training on behaviour and organizational outcomes, due to weak study designs and the scarce use of direct observations. Therefore, the aim of this study is to determine the effectiveness and cost-effectiveness of CRM training on attitude, behaviour and organization after one year, using a multi-method approach and matched control units. The purpose of the present article is to describe the study protocol and the underlying choices of this evaluation study of CRM in the ICU in detail. Methods/Design Six ICUs participated in a paired controlled trial, with one pre-test and two post test measurements (respectively three months and one year after the training). Three ICUs were trained and compared to matched control ICUs. The 2-day classroom-based training was delivered to multidisciplinary groups. Typical CRM topics on the individual, team and organizational level were discussed, such as situational awareness, leadership and communication. All levels of Kirkpatrick's evaluation framework (reaction, learning, behaviour and organisation) were assessed using questionnaires, direct observations, interviews and routine ICU administration data. Discussion It is expected that the CRM training acts as a generic intervention that stimulates specific interventions. Besides effectiveness and cost-effectiveness, the assessment of the barriers and facilitators will provide insight in the implementation process of CRM. Trial registration Netherlands Trial Register (NTR): NTR1976 PMID:22073981

  9. A Method to Predict Compressor Stall in the TF34-100 Turbofan Engine Utilizing Real-Time Performance Data

    Science.gov (United States)

    2015-06-01

    pass turbo –fan engine sensor data to seek its deterioration modelling and prognostics capability. In futurity this will allow for achievement of...preventive maintenance for the TF34-100 jet engine to prevent engine compressor stalls for the A-10 aircraft. Due to their destructive nature, compressor...stalls are a significant concern in axial flow compressor jet engines. A compressor stall is caused by air approaching the compressor blades at an

  10. An archival analysis of stall warning system effectiveness during airborne icing encounters

    Science.gov (United States)

    Maris, John Michael

    An archival study was conducted to determine the influence of stall warning system performance on aircrew decision-making outcomes during airborne icing encounters. A Conservative Icing Response Bias (CIRB) model was developed to explain the historical variability in aircrew performance in the face of airframe icing. The model combined Bayes' Theorem with Signal Detection Theory (SDT) concepts to yield testable predictions that were evaluated using a Binary Logistic Regression (BLR) multivariate technique applied to two archives: the NASA Aviation Safety Reporting System (ASRS) incident database, and the National Transportation Safety Board (NTSB) accident databases, both covering the period January 1, 1988 to October 2, 2015. The CIRB model predicted that aircrew would experience more incorrect response outcomes in the face of missed stall warnings than with stall warning False Alarms. These predicted outcomes were observed at high significance levels in the final sample of 132 NASA/NTSB cases. The CIRB model had high sensitivity and specificity, and explained 71.5% (Nagelkerke R2) of the variance of aircrew decision-making outcomes during the icing encounters. The reliability and validity metrics derived from this study suggest indicate that the findings are generalizable to the population of U.S. registered turbine-powered aircraft. These findings suggest that icing-related stall events could be reduced if the incidence of stall warning Misses could be minimized. Observed stall warning Misses stemmed from three principal causes: aerodynamic icing effects, which reduced the stall angle-of-attack (AoA) to below the stall warning calibration threshold; tail stalls, which are not monitored by contemporary protection systems; and icing-induced system issues (such as frozen pitot tubes), which compromised stall warning system effectiveness and airframe envelope protections. Each of these sources of missed stall warnings could be addressed by Aerodynamic Performance

  11. Behavior Modification in the Classroom

    Science.gov (United States)

    Whitman, Mryon; Whitman, Joan

    1971-01-01

    This article presents the theoretical rationale for behavior modification, principally through its comparison with traditional psychotherapies, and suggests some behavior modification techniques for the classroom management of maladaptive behavior. (Author)

  12. Stall Margin Improvement in a Centrifugal Compressor through Inducer Casing Treatment

    Directory of Open Access Journals (Sweden)

    V. V. N. K. Satish Koyyalamudi

    2016-01-01

    Full Text Available The increasing trend of high stage pressure ratio with increased aerodynamic loading has led to reduction in stable operating range of centrifugal compressors with stall and surge initiating at relatively higher mass flow rates. The casing treatment technique of stall control is found to be effective in axial compressors, but very limited research work is published on the application of this technique in centrifugal compressors. Present research was aimed to investigate the effect of casing treatment on the performance and stall margin of a high speed, 4 : 1 pressure ratio centrifugal compressor through numerical simulations using ANSYS CFX software. Three casing treatment configurations were developed and incorporated in the shroud over the inducer of the impeller. The predicted performance of baseline compressor (without casing treatment was in good agreement with published experimental data. The compressor with different inducer casing treatment geometries showed varying levels of stall margin improvement, up to a maximum of 18%. While the peak efficiency of the compressor with casing treatment dropped by 0.8%–1% compared to the baseline compressor, the choke mass flow rate was improved by 9.5%, thus enhancing the total stable operating range. The inlet configuration of the casing treatment was found to play an important role in stall margin improvement.

  13. An airloads theory for morphing airfoils in dynamic stall with experimental correlation

    Science.gov (United States)

    Ahaus, Loren A.

    Helicopter rotor blades frequently encounter dynamic stall during normal flight conditions, limiting the applicability of classical thin-airfoil theory at large angles of attack. Also, it is evident that because of the largely different conditions on the advancing and retreating sides of the rotor, future rotorcraft may incorporate dynamically morphing airfoils (trailing-edge aps, dynamic camber, dynamic droop, etc.). Reduced-order aerodynamic models are needed for preliminary design and ight simulation. A unified model for predicting the airloads on a morphing airfoil in dynamic stall is presented, consisting of three components. First, a linear airloads theory allows for arbitrary airfoil deformations consistent with a morphing airfoil. Second, to capture the effects of the wake, the airloads theory is coupled to an induced ow model. Third, the overshoot and time delay associated with dynamic stall are modeled by a second-order dynamic filter, along the lines of the ONERA dynamic stall model. This paper presents a unified airloads model that allows arbitrary airfoil morphing with dynamic stall. Correlations with experimental data validate the theory.

  14. A time-varying subjective quality model for mobile streaming videos with stalling events

    Science.gov (United States)

    Ghadiyaram, Deepti; Pan, Janice; Bovik, Alan C.

    2015-09-01

    Over-the-top mobile video streaming is invariably influenced by volatile network conditions which cause playback interruptions (stalling events), thereby impairing users' quality of experience (QoE). Developing models that can accurately predict users' QoE could enable the more efficient design of quality-control protocols for video streaming networks that reduce network operational costs while still delivering high-quality video content to the customers. Existing objective models that predict QoE are based on global video features, such as the number of stall events and their lengths, and are trained and validated on a small pool of ad hoc video datasets, most of which are not publicly available. The model we propose in this work goes beyond previous models as it also accounts for the fundamental effect that a viewer's recent level of satisfaction or dissatisfaction has on their overall viewing experience. In other words, the proposed model accounts for and adapts to the recency, or hysteresis effect caused by a stall event in addition to accounting for the lengths, frequency of occurrence, and the positions of stall events - factors that interact in a complex way to affect a user's QoE. On the recently introduced LIVE-Avvasi Mobile Video Database, which consists of 180 distorted videos of varied content that are afflicted solely with over 25 unique realistic stalling events, we trained and validated our model to accurately predict the QoE, attaining standout QoE prediction performance.

  15. The Classroom Animal: Snails.

    Science.gov (United States)

    Kramer, David S.

    1985-01-01

    Points out that snails are interesting and easily-managed classroom animals. One advantage of this animal is that it requires no special attention over weekends or holidays. Background information, anatomy, reproduction, and feeding are discussed, along with suggestions for housing aquatic and/or land snails. (DH)

  16. Flipped classroom

    DEFF Research Database (Denmark)

    Skov, Tobias Kidde; Jørgensen, Søren

    2016-01-01

    Artiklen beskriver Flipped Classroom som et didaktisk princip, der kan være med til at organisere og tilrettelægge en undervisning, med fokus på forskellige læringsformer. Det handler om at forstå Flipped Classroom som en opdeling i 2 faser og 3 led, som samlet set skaber en didaktisk organisering....

  17. The Influence of Classroom Management, Administrative Support, Parental Involvement, and Economic Factors on the Retention of Novice Teachers

    Science.gov (United States)

    Dwyer, Katrina Moody

    2013-01-01

    The purpose of this study was to examine the impact of selected factors upon the intent of novice teachers to remain in the classroom. Teachers are leaving the profession in numbers that have prompted significant concern among policymakers and administrators. Many qualified college students are not considering the field of education as a potential…

  18. Internet in Teachers' Professional Practice outside the Classroom: Examining Supportive and Management Uses in Primary and Secondary Schools

    Science.gov (United States)

    Meneses, Julio; Fabregues, Sergi; Rodriguez-Gomez, David; Ion, Georgeta

    2012-01-01

    In recent years there has been widespread interest in the implementation of information and communication technologies (ICT) in schools. While most studies primarily focus on the use of ICT in teaching and learning, little attention has been given to their incorporation as a professional tool outside the classroom. Using a digital inequality…

  19. The role of tip clearance in high-speed fan stall

    Energy Technology Data Exchange (ETDEWEB)

    Adamczyk, J.J. (NASA Lewis Research Center, Cleveland, OH (United States)); Celestina, M.L. (Sverdrup Tech., Inc., Cleveland, OH (United States)); Greitzer, E.M. (Massachusetts Institute of Technology, Cambridge, MA (United States))

    1993-01-01

    A numerical experiment has been carried out to define the near-stall casing endwall flow field of a high-speed fan rotor. The experiment used a simulation code incorporating a simple clearance model, whose calibration is presented. The results of the simulation show that the interaction of the tip leakage vortex and the in-passage shock plays a major role in determining the fan flow range. More specifically, the computations imply that it is the area increase of this vortex as it passes through the in-passage shock that is the source of the blockage associated with stall. In addition, for fans of this type, it is the clearance over the forward portion of the fan blade that controls the flow processes leading to stall.

  20. The role of tip clearance in high-speed fan stall

    Science.gov (United States)

    Adamczyk, J. J.; Celestina, M. L.; Greitzer, E. M.

    1991-01-01

    A numerical experiment has been carried out to define the near-stall casing endwall flowfield of a high-speed fan rotor. The experiment used a simulation code incorporating a simple clearance model, whose calibration is presented. The results of the simulation show that the interaction of the tip leakage vortex and the in-pasage shock plays a major role in determining the fan flow range. More specifically, the computations imply that it is the area increase of this vortex as it passes through the in-passage shock, which is the source of the blockage associated with stall. In addition, for fans of this type, it is the clearance over the forward portion of the fan blade which controls the flow processes leading to stall.

  1. The computation of the post-stall behavior of a circulation controlled airfoil

    Science.gov (United States)

    Linton, Samuel W.

    1993-01-01

    The physics of the circulation controlled airfoil is complex and poorly understood, particularly with regards to jet stall, which is the eventual breakdown of lift augmentation by the jet at some sufficiently high blowing rate. The present paper describes the numerical simulation of stalled and unstalled flows over a two-dimensional circulation controlled airfoil using a fully implicit Navier-Stokes code, and the comparison with experimental results. Mach numbers of 0.3 and 0.5 and jet total to freestream pressure ratios of 1.4 and 1.8 are investigated. The Baldwin-Lomax and k-epsilon turbulence models are used, each modified to include the effect of strong streamline curvature. The numerical solutions of the post-stall circulation controlled airfoil show a highly regular unsteady periodic flowfield. This is the result of an alternation between adverse pressure gradient and shock induced separation of the boundary layer on the airfoil trailing edge.

  2. Prediction of RNA Polymerase II recruitment, elongation and stalling from histone modification data

    DEFF Research Database (Denmark)

    Chen, Yun; Jørgensen, Mette; Kolde, Raivo

    2011-01-01

    strategies are needed to progress from descriptive annotation of data to quantitative, predictive models. RESULTS: Here, we describe a computational framework which with high accuracy can predict the locations of core promoters, the amount of recruited RNAPII at the promoter, the amount of elongating RNAPII...... of RNAPII stalling. CONCLUSIONS: In this study we introduce a general framework to accurately predict the level of RNAPII recruitment, elongation, stalling and mRNA expression from chromatin signals. The versatility of the method also makes it ideally suited to investigate other genomic data....

  3. Analysis of compressible light dynamic stall flow at transitional Reynolds numbers

    DEFF Research Database (Denmark)

    Dyken, R.D. Van; Ekaterinaris, John A.; Chandrasekhara, M.S.

    1996-01-01

    Numerical and experimental results of steady and light dynamic stall flow over an oscillating NACA 0012 airfoil at a freestream Mach number of 0.3 and Reynolds number of 0.54 x 10(6) are compared, The experimental observation that dynamic stall is induced from the bursting of a laminar separation...... point is specified suitably and a simple transition length model is incorporated to determine the extent of the laminar separation bubble. The thin-layer approximations of compressible, Reynolds-averaged, Navier-Stokes equations are used for the numerical solution, with an implicit, upwind-biased, third...

  4. The influence of elevated feed stalls on feeding behaviour of lactating dairy cows

    Directory of Open Access Journals (Sweden)

    Barbara Benz

    2014-10-01

    Full Text Available The performance level of high yielding cows can only be guaranteed by high quality forage and high feed intake. An about 15–20 cm elevated and 160 cm long feed stall with rubber flooring doesn’t only offer undisturbed meals but also a yielding and dry standing surface. In a pilot stable with 130 dairy cows (German Simmental the feeding alley was subsequently equipped with elevated feed stalls. The results show that animals frequented the feeding barn less often while the duration of single meals prolonged. The specific behavioural changes differed depending on milk yield and number of lactation.

  5. Diagnosis of voltage collapse due to induction motor stalling using static analysis

    International Nuclear Information System (INIS)

    Karbalaei, F.; Kalantar, M.; Kazemi, A.

    2008-01-01

    Induction motor stalling is one of the important reasons for voltage collapse. This paper presents that, for induction motor stalling diagnosis, it is not necessary to use a third or first order dynamic model of induction motors. Instead, a method is presented based on algebraic calculations for which the steady state model of the induction motor considering different kinds of mechanical loads (constant and variable torque) is added to the power flow equations. Simulation results for a simple system confirm the correctness of the proposed method as compared to dynamic simulation results

  6. Power control of a wind farm with active stall wind turbines and AC grid connection

    DEFF Research Database (Denmark)

    Hansen, Anca Daniela; Sørensen, Poul; Iov, Florin

    This paper describes the design of a centralised wind farm controller for a wind farm made-up exclusively of active stall wind turbines with AC grid connection. The overall aim of such controller is to enable the wind farms to provide the best grid support. The designed wind farm control involves...... both the control on wind turbine level as well as the central control on the wind farm level. The ability of active stall wind farms with AC grid connection to regulate the power production to the reference power ordered by the operators is assessed and discussed by means of simulations....

  7. Validation of the Beddoes-Leishman Dynamic Stall Model for Horizontal Axis Wind Turbines using MEXICO data

    NARCIS (Netherlands)

    Pereira, R.; Schepers, G.; Pavel, M.D.

    2011-01-01

    The aim of this study is to assess the load predicting capability of a classical Beddoes-Leishman dynamic stall model in a horizontal axis wind turbine (HAWT) environment, in the presence of yaw-misalignment. The dynamic stall model was tailored to the HAWT environment, and validated against

  8. A stochastic model for the simulation of wind turbine blades in static stall

    DEFF Research Database (Denmark)

    Bertagnolio, Franck; Rasmussen, Flemming; Sørensen, Niels N.

    2010-01-01

    The aim of this work is to improve aeroelastic simulation codes by accounting for the unsteady aerodynamic forces that a blade experiences in static stall. A model based on a spectral representation of the aerodynamic lift force is defined. The drag and pitching moment are derived using...

  9. Physics of Prestall Propagating Disturbances in Axial Compressors and Their Potential as a Stall Warning Indicator

    Directory of Open Access Journals (Sweden)

    Mario Eck

    2017-03-01

    Full Text Available Axial compressors in aero engines are prone to suffering a breakdown of orderly flow when operating at the peak of the pressure rise characteristic. The damaging potential of separated flows is why a safe distance has to be left between every possible operating point and an operating point at which stall occurs. During earlier investigations of stall inception mechanisms, a new type of prestall instability has been found. In this study, it could be demonstrated that the prestall instability characterised by discrete flow disturbances can be clearly assigned to the subject of “Rotating Instabilities”. Propagating disturbances are responsible for the rise in blade passing irregularity. If the mass flow is reduced successively, the level of irregularity increases until the prestall condition devolves into rotating stall. The primary objective of the current work is to highlight the basic physics behind these prestall disturbances by complementary experimental and numerical investigations. Before reaching the peak of the pressure rise characteristic flow, disturbances appear as small vortex tubes with one end attached to the casing and the other attached to the suction surface of the rotor blade. These vortex structures arise when the entire tip region is affected by blockage and at the same time the critical rotor incidence is not exceeded in this flow regime. Furthermore, a new stall indicator was developed by applying statistical methods to the unsteady pressure signal measured over the rotor blade tips, thus granting a better control of the safety margin.

  10. Numerical Study on the Acoustic Characteristics of an Axial Fan under Rotating Stall Condition

    Directory of Open Access Journals (Sweden)

    Lei Zhang

    2017-11-01

    Full Text Available Axial fan is an important piece of equipment in the thermal power plant that provides enough air for combustion of coal. This paper focuses on the aerodynamic noise characteristics of an axial fan in the development from stall inception to stall cells. The aerodynamic noise characteristic of monitoring region in time and frequency domains was simulated employing the large-eddy simulation (LES, with the addition of throttle setting and the Ffowcs Williams-Hawkings (FW-H noise model. The numerical results show that, under the design condition, the acoustic pressure presents regular periodicity along with the time. The noise energy is concentrated with high energy of the fundamental frequency and high order harmonics. During the stall inception stage, the acoustic pressure amplitude starts fluctuating and discrete frequencies are increased significantly in the low frequency; among them, there are three obvious discrete frequencies: 27.66 Hz, 46.10 Hz and 64.55 Hz. On the rotating stall condition, the fluctuation of the acoustic pressure level and amplitude are more serious than that mentioned above. During the whole evolution process, the acoustic pressure peak is difficult to keep stable all the time, and a sudden increase of the peak value at the 34.5th revolution corresponds to the relative velocity’s first sudden increase at the time when the valve coefficient is 0.780.

  11. Accounting for biases in riboprofiling data indicates a major role for proline in stalling translation.

    Science.gov (United States)

    Artieri, Carlo G; Fraser, Hunter B

    2014-12-01

    The recent advent of ribosome profiling-sequencing of short ribosome-bound fragments of mRNA-has offered an unprecedented opportunity to interrogate the sequence features responsible for modulating translational rates. Nevertheless, numerous analyses of the first riboprofiling data set have produced equivocal and often incompatible results. Here we analyze three independent yeast riboprofiling data sets, including two with much higher coverage than previously available, and find that all three show substantial technical sequence biases that confound interpretations of ribosomal occupancy. After accounting for these biases, we find no effect of previously implicated factors on ribosomal pausing. Rather, we find that incorporation of proline, whose unique side-chain stalls peptide synthesis in vitro, also slows the ribosome in vivo. We also reanalyze a method that implicated positively charged amino acids as the major determinant of ribosomal stalling and demonstrate that it produces false signals of stalling in low-coverage data. Our results suggest that any analysis of riboprofiling data should account for sequencing biases and sparse coverage. To this end, we establish a robust methodology that enables analysis of ribosome profiling data without prior assumptions regarding which positions spanned by the ribosome cause stalling. © 2014 Artieri and Fraser; Published by Cold Spring Harbor Laboratory Press.

  12. EVALUATION OF STYRENE EMISSIONS FROM A SHOWER STALL/BATHTUB MANUFACTURING FACILITY

    Science.gov (United States)

    The report gives results of emissions measurements carried out at a representative facility (Eljer Plumbingware in Wilson, NC) that manufactures polyester-resin-reinforced shower stalls and bathtubs by spraying styrene-based resins onto molds in vented, open, spray booths. Styren...

  13. 14 CFR 23.203 - Turning flight and accelerated turning stalls.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 1 2010-01-01 2010-01-01 false Turning flight and accelerated turning stalls. 23.203 Section 23.203 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF... a 30 degree bank. Reduce speed by steadily and progressively tightening the turn with the elevator...

  14. Power reduction and the radial limit of stall delay in revolving wings of different aspect ratio

    NARCIS (Netherlands)

    Kruyt, J.W.; Heijst, Van G.F.; Altshuler, D.L.; Lentink, David

    2015-01-01

    Airplanes and helicopters use high aspect ratio wings to reduce the power required to fly, but must operate at low angle of attack to prevent flow separation and stall. Animals capable of slow sustained flight, such as hummingbirds, have low aspect ratio wings and flap their wings at high angle

  15. Vortical structures responsible for delayed stall in an idealized humpback whale flipper model

    Science.gov (United States)

    Kim, Heesu; Kim, Jooha; Choi, Haecheon

    2016-11-01

    In this study, we investigate how the tubercles on the leading edge of an idealized humpback whale flipper model delay the stall. Oil-surface visualization is performed to see the surface flow pattern on the suction surface, and PIV is conducted in several streamwise and crossflow planes at different attack angles (α). Without tubercles, leading edge separation first occurs near the tip region and progresses inboard with increasing α. With tubercles, however, two types of vortical motions are observed at the mid-span. The first is streamwise vortex arrays which are dominant at α 9° , and these structures appear near the trailing edge. These two types of vortical motions delay flow separation at the peak regions of the mid-span, eliminating the spanwise stall progression and resulting in delayed stall. At α = 16° at which the tubercle model stalls, a large-scale streamwise vortex is originated from flow separation near the root region. This structure delays flow separation at the mid-span, leading to higher lift coefficient. Supported by NRF-2014M3C1B1033848.

  16. Identification of phlebovirus and arenavirus RNA sequences that stall and repress the exoribonuclease XRN1.

    Science.gov (United States)

    Charley, Phillida A; Wilusz, Carol J; Wilusz, Jeffrey

    2018-01-05

    Regulated mRNA decay plays a vital role in determining both the level and quality of cellular gene expression. Viral RNAs must successfully evade this host RNA decay machinery to establish a productive infection. One way for RNA viruses to accomplish this is to target the cellular exoribonuclease XRN1, because this enzyme is accessible in the cytoplasm and plays a major role in mRNA decay. Members of the Flaviviridae use RNA structures in their 5'- or 3'-untranslated regions to stall and repress XRN1, effectively stabilizing viral RNAs while also causing significant dysregulation of host cell mRNA stability. Here, we use a series of biochemical assays to demonstrate that the 3'-terminal portion of the nucleocapsid (N) mRNA of Rift Valley fever virus, a phlebovirus of the Bunyaviridae family, also can effectively stall and repress XRN1. The region responsible for impeding XRN1 includes a G-rich portion that likely forms a G-quadruplex structure. The 3'-terminal portions of ambisense-derived transcripts of multiple arenaviruses also stalled XRN1. Therefore, we conclude that RNAs from two additional families of mammalian RNA viruses stall and repress XRN1. This observation. emphasizes the importance and commonality of this viral strategy to interfere with the 5'-to-3'-exoribonuclease component of the cytoplasmic RNA decay machinery. © 2018 by The American Society for Biochemistry and Molecular Biology, Inc.

  17. Theory/test correlation of helicopter rotor blade element airloads in the blade stall regime

    Science.gov (United States)

    Bobo, C. J.

    1972-01-01

    The effects of stall on a rotor blade element in a three-dimensional rotating environment was investigated. The model rotor test provided blade element airloads and local boundary layer flow characteristics at the three-quarter blade radius position for a wide range of rotor operating conditions. A description of the test program and the test results are presented.

  18. Field rotor measurements. Data sets prepared for analysis of stall hysteresis

    Energy Technology Data Exchange (ETDEWEB)

    Aagaard Madsen, H.; Thirstrup Petersen, J. [Risoe National Lab. (Denmark); Bruining, A. [Delft Univ. of Technology (Netherlands); Brand, A. [ECN (Netherlands); Graham, M. [Imperical College (United Kingdom)

    1998-05-01

    As part of the JOULE-3 project `STALLVIB` an analysis and synthesis of the data from the field rotor experiments at ECN, Delft University, Imperial College, NREL and Risoe has been carried out. This has been done in order to see to what extent the data could be used for further development and validation of engineering dynamic stall models. A detailed investigation of the influence of the post-processing of the different data sets has been performed. Further, important statistical functions such as PSD spectra, coherence and transfer functions have been derived for the data sets which can be used as basis for evaluation of the quality of the data seen relative to actual application of the data. The importance of using an appropriate low-pass filtering to remove high frequency noise has been demonstrated when the relation between instantaneous values of e.g. {alpha} and C{sub N} is considered. In general, the complicated measurement on a rotor of {alpha} and w and the interpretation of these parameters combined with the strongly three-dimensional, turbulent flow field around the rotating blade has the consequence that it seems difficult to derive systematic information from the different data sets about stall hysteresis. In particular, the measurement of {alpha}, which determination of the stagnation point gives reasonable data below stall but fails in stall. On the other hand, measurements of {alpha} with a five hole pitot tube can be used also in the stall region. Another main problem is the non-dimensionalization of the coefficients C{sub N} and C{sub r}. If the dynamic pressure used for the non-dimensionalization is not fully correlated with the aerodynamic pressure over the considered airfoil section due to e.g. influence of the gravity on the pressure pipes, the hysteresis loops will be distorted. However, using the data with caution and applying a suitable post-processing as described by the different participants, it will probably be possible to obtain some

  19. Modeling dynamic stall on wind turbine blades under rotationally augmented flow fields

    Energy Technology Data Exchange (ETDEWEB)

    Guntur, S. [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Schreck, S. [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Sorensen, N. N. [Technical Univ. of Denmark, Lyngby (Denmark); Bergami, L. [Technical Univ. of Denmark, Lyngby (Denmark)

    2015-04-22

    It is well known that airfoils under unsteady flow conditions with a periodically varying angle of attack exhibit aerodynamic characteristics different from those under steady flow conditions, a phenomenon commonly known as dynamic stall. It is also well known that the steady aerodynamic characteristics of airfoils in the inboard region of a rotating blade differ from those under steady two-dimensional (2D) flow conditions, a phenomenon commonly known as rotational augmentation. This paper presents an investigation of these two phenomena together in the inboard parts of wind turbine blades. This analysis is carried out using data from three sources: (1) the National Renewable Energy Laboratory’s Unsteady Aerodynamics Experiment Phase VI experimental data, including constant as well as continuously pitching blade conditions during axial operation, (2) data from unsteady Delayed Detached Eddy Simulations (DDES) carried out using the Technical University of Denmark’s in-house flow solver Ellipsys3D, and (3) data from a simplified model based on the blade element momentum method with a dynamic stall subroutine that uses rotationally augmented steady-state polars obtained from steady Phase VI experimental sequences, instead of the traditional 2D nonrotating data. The aim of this work is twofold. First, the blade loads estimated by the DDES simulations are compared to three select cases of the N sequence experimental data, which serves as a validation of the DDES method. Results show reasonable agreement between the two data in two out of three cases studied. Second, the dynamic time series of the lift and the moment polars obtained from the experiments are compared to those from the dynamic stall subroutine that uses the rotationally augmented steady polars. This allowed the differences between the stall phenomenon on the inboard parts of harmonically pitching blades on a rotating wind turbine and the classic dynamic stall representation in 2D flow to be

  20. Parametric analyses on dynamic stall control of rotor airfoil via synthetic jet

    Directory of Open Access Journals (Sweden)

    Qijun ZHAO

    2017-12-01

    Full Text Available The effects of synthetic jet control on unsteady dynamic stall over rotor airfoil are investigated numerically. A moving-embedded grid method and an Unsteady Reynolds Averaged Navier-Stokes (URANS solver coupled with k-ω Shear Stress Transport (SST turbulence model are established for predicting the complex flowfields of oscillatory airfoil under jet control. Additionally, a velocity boundary condition modeled by sinusoidal function has been developed to fulfill the perturbation effect of periodic jet. The validity of present CFD method is evaluated by comparisons of the calculated results of baseline dynamic stall case for rotor airfoil and jet control case for VR-7B airfoil with experimental data. Then, parametric analyses are conducted emphatically for an OA212 rotor airfoil to investigate the effects of jet control parameters (jet location, dimensionless frequency, momentum coefficient, jet angle, jet type and dual-jet on dynamic stall characteristics of rotor airfoil. It is demonstrated by the calculated results that efficiency of jet control could be improved with specific momentum coefficient and jet angle when the jet is located near separation point of rotor airfoil. Furthermore, the dual-jet could improve control efficiency more obviously on dynamic stall of rotor airfoil with respect to the unique jet, and the influence laws of dual-jet’s angles and momentum coefficients on control effects are similar to those of the unique jet. Finally, unsteady aerodynamic characteristics of rotor via synthetic jet which is located on the upper surface of rotor blade in forward flight are calculated, and as a result, the aerodynamic characteristics of rotor are improved compared with the baseline. The results indicate that synthetic jet has the capability in improving aerodynamic characteristics of rotor. Keywords: Airfoil, Dynamic stall characteristics, Flow control, Moving-embedded grid methodology, Navier-Stokes equations, Parametric

  1. Power reduction and the radial limit of stall delay in revolving wings of different aspect ratio.

    Science.gov (United States)

    Kruyt, Jan W; van Heijst, GertJan F; Altshuler, Douglas L; Lentink, David

    2015-04-06

    Airplanes and helicopters use high aspect ratio wings to reduce the power required to fly, but must operate at low angle of attack to prevent flow separation and stall. Animals capable of slow sustained flight, such as hummingbirds, have low aspect ratio wings and flap their wings at high angle of attack without stalling. Instead, they generate an attached vortex along the leading edge of the wing that elevates lift. Previous studies have demonstrated that this vortex and high lift can be reproduced by revolving the animal wing at the same angle of attack. How do flapping and revolving animal wings delay stall and reduce power? It has been hypothesized that stall delay derives from having a short radial distance between the shoulder joint and wing tip, measured in chord lengths. This non-dimensional measure of wing length represents the relative magnitude of inertial forces versus rotational accelerations operating in the boundary layer of revolving and flapping wings. Here we show for a suite of aspect ratios, which represent both animal and aircraft wings, that the attachment of the leading edge vortex on a revolving wing is determined by wing aspect ratio, defined with respect to the centre of revolution. At high angle of attack, the vortex remains attached when the local radius is shorter than four chord lengths and separates outboard on higher aspect ratio wings. This radial stall limit explains why revolving high aspect ratio wings (of helicopters) require less power compared with low aspect ratio wings (of hummingbirds) at low angle of attack and vice versa at high angle of attack. © 2015 The Author(s) Published by the Royal Society. All rights reserved.

  2. The ribosome quality control pathway can access nascent polypeptides stalled at the Sec61 translocon.

    Science.gov (United States)

    von der Malsburg, Karina; Shao, Sichen; Hegde, Ramanujan S

    2015-06-15

    Cytosolic ribosomes that stall during translation are split into subunits, and nascent polypeptides trapped in the 60S subunit are ubiquitinated by the ribosome quality control (RQC) pathway. Whether the RQC pathway can also target stalls during cotranslational translocation into the ER is not known. Here we report that listerin and NEMF, core RQC components, are bound to translocon-engaged 60S subunits on native ER membranes. RQC recruitment to the ER in cultured cells is stimulated by translation stalling. Biochemical analyses demonstrated that translocon-targeted nascent polypeptides that subsequently stall are polyubiquitinated in 60S complexes. Ubiquitination at the translocon requires cytosolic exposure of the polypeptide at the ribosome-Sec61 junction. This exposure can result from either failed insertion into the Sec61 channel or partial backsliding of translocating nascent chains. Only Sec61-engaged nascent chains early in their biogenesis were relatively refractory to ubiquitination. Modeling based on recent 60S-RQC and 80S-Sec61 structures suggests that the E3 ligase listerin accesses nascent polypeptides via a gap in the ribosome-translocon junction near the Sec61 lateral gate. Thus the RQC pathway can target stalled translocation intermediates for degradation from the Sec61 channel. © 2015 von der Malsburg et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0).

  3. Who Says What's Correct and How Do You Say It? Multimodal Management of Oral Peer-Assessment in a Grammar Boardgame in a Foreign Language Classroom

    Science.gov (United States)

    Konzett, Carmen

    2015-01-01

    This paper describes how a small group of students in a foreign language classroom manage the interactional task of orally assessing the correctness of verb forms while playing a board game aimed at revising verb conjugation. In their interaction, the students orient to the institutional context of this activity as a language learning exercise by…

  4. Guided by Theory, Informed by Practice: Training and Support for the Good Behavior Game, a Classroom-based Behavior Management Strategy.

    Science.gov (United States)

    Poduska, Jeanne M; Kurki, Anja

    2014-06-01

    Moving evidence-based practices for classroom behavior management into real-world settings is a high priority for education and public health. This paper describes the development and use of a model of training and support for the Good Behavior Game (GBG), one of the few preventive interventions shown to have positive outcomes for elementary school children lasting through to young adulthood, ages 19-21, including reductions in the use of drugs and alcohol, school-based mental health services, and suicide ideation and attempts. We first describe the conceptual framework guiding the development of the model of training and support. Data on implementation of the model, from an ongoing trial of GBG being conducted in partnership with the Houston Independent School District, are then presented. We end with a discussion of the lessons learned and the implications for the next stage of research and practice.

  5. Conflict Resolution, Can It Really Make a Difference in the Classroom: Conflict Resolution Strategies for Classroom Teachers

    Science.gov (United States)

    Pollan, Savannah; Wilson-Younger, Dylinda

    2012-01-01

    This article discusses conflict and provides five resolutions for teachers on managing negative behaviors within the classroom. Acknowledging and implementing conflict resolution strategies in the classroom enables every student to fully participate in the learning process.

  6. Beliefs and attitudes regarding classroom management Creencias y actitudes respecto a la gestión en el aula

    Directory of Open Access Journals (Sweden)

    Antoni Castelló

    2010-05-01

    Full Text Available The aim of this work is to obtain a description of teachers' and students' beliefs about classroom misbehaviour and evaluate to what extent these beliefs guide their decisions and judgements. 1.389 students (13 to 16 years old and 170 teachers of ESO (Compulsory Secondary Education from northeast Spain have been evaluated by means of a questionnaire designed for this purpose. Results show that behaviour considered socially undesirable is valued as more deserving of penalty than misbehaviour with a less negative social evaluation, even though having a great impact on teaching and learning activities. The students' responses also showed that almost half of them do not recognise classroom-discipline actions carried out by teachers when those actions do not match their expectations. El objetivo de este trabajo es obtener una descripción de las percepciones de los profesores y estudiantes acerca del comportamiento disruptivo y evaluar como estas creencias guían sus decisiones y juicios. 1.389 estudiantes (entre 13 y 16 años y 170 profesores de ESO (Educación Secundaria Obligatoria del nordeste de España fueron evaluados con un cuestionario creado para este propósito. Los resultados muestran que el comportamiento considerado socialmente indeseable es evaluado como más susceptible de ser castigado que comportamientos considerados como no antisociales, aunque tengan un gran impacto en las actividades de enseñanza aprendizaje.

  7. Evaluating response shift in training evaluation: comparing the retrospective pretest with an adapted measurement invariance approach in a classroom management training program.

    Science.gov (United States)

    Piwowar, Valentina; Thiel, Felicitas

    2014-10-01

    Response shift (RS) can threaten the internal validity of pre-post designs. As RS may indicate a redefinition of the target construct, its occurrence in training evaluation is rather likely. The most common approach to deal with RS is to implement a retrospective pretest (then-test) instead of the traditional pre-test. In health psychology, an adapted measurement invariance approach (MIad) was developed as an alternative technique to study RS. Results produced by identifying RS with the two approaches were rarely studied simultaneously or within an experimental framework. To study RS in two different treatment conditions and compare results produced by both techniques in identifying various types of RS. We further studied validity aspects of the then-test. We evaluated RS by applying the then-test procedure (TP) and the measurement invariance apporach MIad within an experimental design: Participants either attended a short-term or a long-term classroom management training program. Participants were 146 student teachers in their first year of master's study. Pre (before training), post, and then self-ratings (after training) on classroom management knowledge were administered. Results indicated that the two approaches do not yield the same results. The MIad identified more and also group-specific RS as opposed to the findings of the TP, which found less and only little evidence for group-specific RS. Further research is needed to study the usability and validity of the respective approaches. In particular, the usability of the then-test seems to be challenged. © The Author(s) 2014.

  8. Internal Flow of a High Specific-Speed Diagonal-Flow Fan (Rotor Outlet Flow Fields with Rotating Stall

    Directory of Open Access Journals (Sweden)

    Norimasa Shiomi

    2003-01-01

    Full Text Available We carried out investigations for the purpose of clarifying the rotor outlet flow fields with rotating stall cell in a diagonal-flow fan. The test fan was a high–specific-speed (ns=1620 type of diagonal-flow fan that had 6 rotor blades and 11 stator blades. It has been shown that the number of the stall cell is 1, and its propagating speed is approximately 80% of its rotor speed, although little has been known about the behavior of the stall cell because a flow field with a rotating stall cell is essentially unsteady. In order to capture the behavior of the stall cell at the rotor outlet flow fields, hot-wire surveys were performed using a single-slant hotwire probe. The data obtained by these surveys were processed by means of a double phase-locked averaging technique, which enabled us to capture the flow field with the rotating stall cell in the reference coordinate system fixed to the rotor. As a result, time-dependent ensemble averages of the three-dimensional velocity components at the rotor outlet flow fields were obtained. The behavior of the stall cell was shown for each velocity component, and the flow patterns on the meridional planes were illustrated.

  9. From Stalled to Successful: The Art of Negotiating

    Science.gov (United States)

    Dolph, David A.

    2009-01-01

    In times of limited resources, the likelihood of difficult negotiations between labor and management may increase even in the best of school districts. The negotiation process can range from traditional to positional to competitive to a more collaborative and cooperative interest-based approach. The most productive approach is a matter of debate…

  10. Critical Success Factors in Teaching Strategic Sales Management: Evidence from Client-Based Classroom and Web-Based Formats

    Science.gov (United States)

    Jaskari, Harri; Jaskari, Minna-Maarit

    2016-01-01

    The importance of sales management as an interface between a company and its customers is widely recognized. However, the teaching of strategic sales management has not received enough attention in marketing education literature. This study analyzes an experiential client-based method for teaching a strategic sales management course. The authors…

  11. Peer-led, transformative learning approaches increase classroom engagement in care self-management classes during inpatient rehabilitation of individuals with spinal cord injury.

    Science.gov (United States)

    Gassaway, Julie; Jones, Michael L; Sweatman, W Mark; Young, Tamara

    2017-10-16

    Evaluate effects of revised education classes on classroom engagement during inpatient rehabilitation for individuals with spinal cord injury/disease (SCI/D). Multiple-baseline, quasi-experimental design with video recorded engagement observations during conventional and revised education classes; visual and statistical analysis of difference in positive engagement responses observed in classes using each approach. 81 patients (72% male, 73% white, mean age 36 SD 15.6) admitted for SCI/D inpatient rehabilitation in a non-profit rehabilitation hospital, who attended one or more of 33 care self-management education classes that were video recorded. All study activities were approved by the host facility institutional review board. Conventional nurse-led self-management classes were replaced with revised peer-led classes incorporating approaches to promote transformative learning. Revised classes were introduced across three subject areas in a step-wise fashion over 15 weeks. Positive engagement responses (asking questions, participating in discussion, gesturing, raising hand, or otherwise noting approval) were documented from video recordings of 14 conventional and 19 revised education classes. Significantly higher average (per patient per class) positive engagement responses were observed in the revised compared to conventional classes (p=0.008). Redesigning SCI inpatient rehabilitation care self-management classes to promote transformative learning increased patient engagement. Additional research is needed to examine longer term outcomes and replicability in other settings.

  12. Investigation of the wind climate in connection with double-stall on wind turbines in Tarifa[Spain]; Undersoegelse af vindklima i forbindelse med dobbelt-stall paa vindmoeller i Tarifa

    Energy Technology Data Exchange (ETDEWEB)

    Christensen, T. [ELSAMPROJEKT A/S, Fredericia, (Denmark); Jensen, L.E. [LM Glasfiber A/S, Lunderskov (Denmark)

    2000-08-01

    This project has compiled data to allow the Danish manufacturers of wind turbines and blades to improve their knowledge of double stall. On the basis of the double stall difficulties different types of turbines using different makes of blades have encountered in the Tarifa area in Southern Spain, meteorological parameters and production data from two turbines have been measured for a local site. Part of the acquired data have been analysed to reach an understanding of why double stall occurs. The analysis strongly suggests that a change in power level due to double stall can be a result of several external factors: (1) Rain cleaning the blades. (2) A more or less random change in the wind speed components uv, or w, which in some cases can affect a - probably - fairly thick boundary layer. (3) A change in the high frequency turbulence where the vortex impact is too insignificant to affect an - almost - randomly - thick boundary layer. (au)

  13. Why Do Promising Therapies Stall in Development and How Can We Move Them Forward?

    Science.gov (United States)

    Wegner, Craig D; Goodwin, Andrew; Cook, Jon C; Allamneni, Krishna; Sohn, Jane; McVean, Maralee

    There are many reasons that molecules fail to progress to market and various principles of risk-benefit decisions that can help drive the molecule through development. This symposium included discussions on global strategies involved in pushing promising molecules to market, what to do when a molecule stalls in its progress to market, and options for rescuing the molecule and pushing it forward again. Innovative partnerships that bring stalled drugs back into clinical development were also addressed. A regulatory perspective on common reasons for a molecule to fail in its forward progress was presented. In addition, situations arise when a third-party advisory committee can provide input to help overcome issues identified by a regulatory agency. Using examples from the private and public domain, presentations centered on how to repurpose a molecule and when more science is needed.

  14. A Beddoes-Leishman type dynamic stall model in state-space and indicial formulations

    DEFF Research Database (Denmark)

    Hansen, M.H.; Gaunaa, Mac; Aagaard Madsen, Helge

    2004-01-01

    This report contains a description of a Beddoes-Leishman type dynamic stall model in both a state-space and an indicial function formulation. The model predicts the unsteady aerodynamic forces and moment on an airfoil section undergoing arbitrary motionin heave, lead-lag, and pitch. The model...... features, such as overshoot of the lift, in the stall region. The linearized model is shown to give identicalresults to the full model for small amplitude oscillations. Furthermore, it is shown that the response of finite thichkness airfoils can be reproduced to a high accuracy by the use of specific...... is carried out by comparing the response of the model with inviscid solutions and observing the general behavior of the model using known airfoil data as input. Theproposed dynamic model gives results identical to inviscid solutions within the attached-flow region; and it exhibits the expected dynamic...

  15. Grid support of a wind farm with active stall wind turbines and AC grid connection

    DEFF Research Database (Denmark)

    Hansen, Anca Daniela; Sørensen, Poul Ejnar; Iov, F.

    2006-01-01

    grid connection. The designed control system has the task of enabling such a wind farm to provide the best grid support. It is based on two control levels: a supervisory control level, which controls the power production of the whole farm by sending out reference signals to each individual wind turbine......, and a local control level, which ensures that the reference power signals at the wind turbine level are reached. The ability of active stall wind farms with AC grid connection to control the power production to the reference power ordered by the operators is assessed and discussed by means of simulations.......One of the main concerns in the grid integration of large wind farms is their ability to behave as active controllable components in the power system. This article presents the design of a new integrated power control system for a wind farm made up exclusively of active stall wind turbines with AC...

  16. How Do School-Based Prevention Programs Impact Teachers? Findings from a Randomized Trial of an Integrated Classroom Management and Social-Emotional Program.

    Science.gov (United States)

    Domitrovich, Celene E; Bradshaw, Catherine P; Berg, Juliette K; Pas, Elise T; Becker, Kimberly D; Musci, Rashelle; Embry, Dennis D; Ialongo, Nicholas

    2016-04-01

    A number of classroom-based interventions have been developed to improve social and behavioral outcomes for students, yet few studies have examined how these programs impact the teachers who are implementing them. Impacts on teachers may affect students and therefore also serve as an important proximal outcome to examine. The current study draws upon data from a school-based randomized controlled trial testing the impact of two prevention programs. In one intervention condition, teachers were trained in the classroom behavior management program, PAX Good Behavior Game (PAX GBG). In a second intervention condition, teachers were trained to use an integrated program, referred to as PATHS to PAX, of the PAX GBG and a social and emotional learning curriculum called Promoting Alternative Thinking Strategies (PATHS©). This study aimed to determine whether both interventions positively impacted teachers, with a particular interest in the teachers' own beliefs and perceptions regarding self-efficacy, burnout, and social-emotional competence. The sample included 350 K-5 teachers across 27 schools (18 schools randomized to intervention, 9 to control). Multilevel latent growth curve analyses indicated that the PATHS to PAX condition generally demonstrated the most benefits to teachers, relative to both the control and PAX GBG conditions. These findings suggest that school-based preventive interventions can have a positive impact on teachers' beliefs and perceptions, particularly when the program includes a social-emotional component. Several possible mechanisms might account for the added benefit to teachers. Additional research is needed to better understand how these programs impact teachers, as well as students.

  17. Teachers’ accuracy in identifying ADHD status and their intended classroom management strategies for students with and without ADHD: a vignette study in South-Korea and Germany

    Directory of Open Access Journals (Sweden)

    Yumi Lee

    2017-04-01

    Full Text Available Background The purpose of this study was to investigate Korean and German teachers’ accurate diagnosis and their intentions of using classroom management strategies (CMS for the hypothetical student depicted in the vignette types. Participants and procedure Through a disproportional stratified sampling procedure, matched 264 Korean and 264 German teachers were distributed. Kos (2004’ eight vignettes were slightly modified due to the different cultural background. SPSS 22.0 was used to analyze the data. Results Within a culture, 68.20% of Korean and 48.90% of German teachers were able to correctly identify attention deficit hyperactivity disorder (ADHD status. Teachers in both countries intend to use emotional support the most, followed by proactive strategies. Across cultures, a significant difference was found between Korean and German teachers with regard to their accuracy in identifying students’ ADHD status. Korean teachers showed higher accuracy than German teachers. Significant differences between the two countries were also observed regarding teachers’ intentions of using corrective and proactive strategies. Korean teachers use more corrective strategies, and German teachers use more proactive strategies. Regarding emotional support, no significant differences were found between Korean and German teachers. Conclusions This study can be a preliminary resource for developing a specific CMS for students with ADHD for both countries. It is suggested that the current status of teachers’ specific CMS for students with ADHD should be investigated in order to develop more specialized CMS for these students. It is worth conducting a meta-analysis of this issue to assess the most effective CMS for students with ADHD in the classroom.

  18. EFFECT OF GROUPING ON CLASSROOM COMMUNITIES

    OpenAIRE

    Toriumi, Fujio; Ishii, Kenichiro

    2006-01-01

    In the education field, the management of student relation-ships is one of the most important duties of teachers. Such management usually reflects the teacher's abilities and experiences. The purpose of this study is to clarify management methods to realize appropriate classroom community structures. In this study, we simulated a community-forming mechanism to clarify the influence of grouping on classroom community formation. We presented a community through a communication network using Hei...

  19. Simulation model of a transient fault controller for an active-stall wind turbine

    Energy Technology Data Exchange (ETDEWEB)

    Jauch, C.; Soerensen, P.; Bak Jensen, B.

    2005-01-01

    This paper describes the simulation model of a controller that enables an active-stall wind turbine to ride through transient faults. The simulated wind turbine is connected to a simple model of a power system. Certain fault scenarios are specified and the turbine shall be able to sustain operation in case of such faults. The design of the controller is described and its performance assessed by simulations. The control strategies are explained and the behaviour of the turbine discussed. (author)

  20. DksA guards elongating RNA polymerase against ribosome-stalling-induced arrest.

    Science.gov (United States)

    Zhang, Yan; Mooney, Rachel A; Grass, Jeffrey A; Sivaramakrishnan, Priya; Herman, Christophe; Landick, Robert; Wang, Jue D

    2014-03-06

    In bacteria, translation-transcription coupling inhibits RNA polymerase (RNAP) stalling. We present evidence suggesting that, upon amino acid starvation, inactive ribosomes promote rather than inhibit RNAP stalling. We developed an algorithm to evaluate genome-wide polymerase progression independently of local noise and used it to reveal that the transcription factor DksA inhibits promoter-proximal pausing and increases RNAP elongation when uncoupled from translation by depletion of charged tRNAs. DksA has minimal effect on RNAP elongation in vitro and on untranslated RNAs in vivo. In these cases, transcripts can form RNA structures that prevent backtracking. Thus, the effect of DksA on transcript elongation may occur primarily upon ribosome slowing/stalling or at promoter-proximal locations that limit the potential for RNA structure. We propose that inactive ribosomes prevent formation of backtrack-blocking mRNA structures and that, in this circumstance, DksA acts as a transcription elongation factor in vivo. Copyright © 2014 Elsevier Inc. All rights reserved.

  1. An automatic system for the detection of dairy cows lying behaviour in free-stall barns

    Directory of Open Access Journals (Sweden)

    Simona M.C. Porto

    2013-09-01

    Full Text Available In this paper, a method for the automatic detection of dairy cow lying behaviour in free-stall barns is proposed. A computer visionbased system (CVBS composed of a video-recording system and a cow lying behaviour detector based on the Viola Jones algorithm was developed. The CVBS performance was tested in a head-to-head free stall barn. Two classifiers were implemented in the software component of the CVBS to obtain the cow lying behaviour detector. The CVBS was validated by comparing its detection results with those generated from visual recognition. This comparison allowed the following accuracy indices to be calculated: the branching factor (BF, the miss factor (MF, the sensitivity, and the quality percentage (QP. The MF value of approximately 0.09 showed that the CVBS missed one cow every 11 well detected cows. Conversely, the BF value of approximately 0.08 indicated that one false positive was detected every 13 well detected cows. The high value of approximately 0.92 obtained for the sensitivity index and that obtained for QP of about 0.85 revealed the ability of the proposed system to detect cows lying in the stalls.

  2. Piloted Simulator Evaluation Results of Flight Physics Based Stall Recovery Guidance

    Science.gov (United States)

    Lombaerts, Thomas; Schuet, Stefan; Stepanyan, Vahram; Kaneshige, John; Hardy, Gordon; Shish, Kimberlee; Robinson, Peter

    2018-01-01

    In recent studies, it has been observed that loss of control in flight is the most frequent primary cause of accidents. A significant share of accidents in this category can be remedied by upset prevention if possible, and by upset recovery if necessary, in this order of priorities. One of the most important upsets to be recovered from is stall. Recent accidents have shown that a correct stall recovery maneuver remains a big challenge in civil aviation, partly due to a lack of pilot training. A possible strategy to support the flight crew in this demanding context is calculating a recovery guidance signal, and showing this signal in an intuitive way on one of the cockpit displays, for example by means of the flight director. Different methods for calculating the recovery signal, one based on fast model predictive control and another using an energy based approach, have been evaluated in four relevant operational scenarios by experienced commercial as well as test pilots in the Vertical Motion Simulator at NASA Ames Research Center. Evaluation results show that this approach could be able to assist the pilots in executing a correct stall recovery maneuver.

  3. The Relationships between Selection and Processing Food with Escherichia coli Contaminant on Food Stall Serving

    Directory of Open Access Journals (Sweden)

    Tris Eryando

    2014-04-01

    Full Text Available Escherichia coli in food stalls surrounding the X Campuss in Depok, year 2012. The research conducted to examine food safety, which were served in surrounding the campus X in Depok. Escherichia coli (E. coli existence was used to indicate the quality of hygiene and sanitation of the food that was served. Using the cross sectional method, the research examined the persons who served the food to be sold in the food stalls in the campus. There were 173 food servers chosen as the respondents from 10 different food stalls around the university. The existence of E. coli examined in the microbiology laboratory in the Faculty of Public Health. Using the most probable number (MPN method found that 59.54% of the food served in the campus were contaminated E. coli. Factors affecting the existence of E. coli were the raw materials (vegetables treated and the length of cooking of the materials (rice/beens. The improper treatment such as washing with no running water or even unwashed vegetables had 5 times risk of the E. coli contamination. Cooking less than 15 minutes was also more risky than cooking more than 15 minutes. As a result, this is very important to find a method to improve knowledge and to increase practical skills in food safety. Furthermore, in this research area may give contribution to avoid E. coli contamination which will prevent unnecessary illness among students in the campus.

  4. Replisome stall events have shaped the distribution of replication origins in the genomes of yeasts

    Science.gov (United States)

    Newman, Timothy J.; Mamun, Mohammed A.; Nieduszynski, Conrad A.; Blow, J. Julian

    2013-01-01

    During S phase, the entire genome must be precisely duplicated, with no sections of DNA left unreplicated. Here, we develop a simple mathematical model to describe the probability of replication failing due to the irreversible stalling of replication forks. We show that the probability of complete genome replication is maximized if replication origins are evenly spaced, the largest inter-origin distances are minimized, and the end-most origins are positioned close to chromosome ends. We show that origin positions in the yeast Saccharomyces cerevisiae genome conform to all three predictions thereby maximizing the probability of complete replication if replication forks stall. Origin positions in four other yeasts—Kluyveromyces lactis, Lachancea kluyveri, Lachancea waltii and Schizosaccharomyces pombe—also conform to these predictions. Equating failure rates at chromosome ends with those in chromosome interiors gives a mean per nucleotide fork stall rate of ∼5 × 10−8, which is consistent with experimental estimates. Using this value in our theoretical predictions gives replication failure rates that are consistent with data from replication origin knockout experiments. Our theory also predicts that significantly larger genomes, such as those of mammals, will experience a much greater probability of replication failure genome-wide, and therefore will likely require additional compensatory mechanisms. PMID:23963700

  5. Near Stall Flow Analysis in the Transonic Fan of the RTA Propulsion System

    Science.gov (United States)

    Hah, Chunill

    2010-01-01

    Turbine-based propulsion systems for access to space have been investigated at NASA Glenn Research center. A ground demonstrator engine for validation testing has been developed as a part of the program. The demonstrator, the Revolutionary Turbine Accelerator (RTA-1), is a variable cycle turbofan ramjet designed to transition from an augmented turbofan to a ramjet that produces the thrust required to accelerate the vehicle to Mach 4. The RTA-1 is designed to accommodate a large variation in bypass ratio from sea level static to Mach 4 flight condition. A key component of this engine is a new fan stage that accommodates these large variations in bypass ratio and flow ranges. In the present study, unsteady flow behavior in the fan of the RTA-1 is studied in detail with large eddy simulation (LES) and the numerical results are compared with measured data. During the experimental study of the fan stage, humming sound was detected at 100 % speed near stall operation. The main purpose of the study is to investigate details of the unsteady flow behavior at near stall operation and to identify a possible cause of the hum. The large eddy simulation of the current flow field reproduces main features of the measured flow very well. The LES simulation indicates that non-synchronous flow instability develops as the fan operates toward the stall limit. The FFT analysis of the calculated wall pressure shows that the rotating flow instability has the characteristic frequency that is about 50% of the blade passing frequency.

  6. Aire unleashes stalled RNA polymerase to induce ectopic gene expression in thymic epithelial cells.

    Science.gov (United States)

    Giraud, Matthieu; Yoshida, Hideyuki; Abramson, Jakub; Rahl, Peter B; Young, Richard A; Mathis, Diane; Benoist, Christophe

    2012-01-10

    Aire is a transcriptional regulator that induces expression of peripheral tissue antigens (PTA) in thymic medullary epithelial cells (MECs), driving immunological self-tolerance in differentiating T cells. To elucidate its mechanistic pathways, we examined its transcriptional impact in MECs in vivo by microarray analysis with mRNA-spanning probes. This analysis revealed initiation of Aire-activated genes to be comparable in Aire-deficient and wild-type MECs, but with a block to elongation after 50-100 bp in the absence of Aire, suggesting activation by release of stalled polymerases by Aire. In contrast, patterns of activation by transcription factors such as Klf4 were consistent with regulation of initiation. Mapping of Aire and RNA polymerase-II (Pol-II) by ChIP and high-throughput sequencing (ChIP-seq) revealed that Aire bound all Pol-II-rich transcriptional start sites (TSS), irrespective of its eventual effect. However, the genes it preferentially activated were characterized by a relative surfeit of stalled polymerases at the TSS, which resolved once Aire was introduced into cells. Thus, transcript mapping and ChIP-seq data indicate that Aire activates ectopic transcription not through specific recognition of PTA gene promoters but by releasing stalled polymerases.

  7. Short revolving wings enable hovering animals to avoid stall and reduce drag

    Science.gov (United States)

    Lentink, David; Kruyt, Jan W.; Heijst, Gertjan F.; Altshuler, Douglas L.

    2014-11-01

    Long and slender wings reduce the drag of airplanes, helicopters, and gliding animals, which operate at low angle of attack (incidence). Remarkably, there is no evidence for such influence of wing aspect ratio on the energetics of hovering animals that operate their wings at much higher incidence. High incidence causes aircraft wings to stall, hovering animals avoid stall by generating an attached vortex along the leading edge of their wings that elevates lift. Hypotheses that explain this capability include the necessity for a short radial distance between the shoulder joint and wing tip, measured in chord lengths, instead of the long tip-to-tip distance that elevates aircraft performance. This stems from how hovering animals revolve their wings around a joint, a condition for which the precise effect of aspect ratio on stall performance is unknown. Here we show that the attachment of the leading edge vortex is determined by wing aspect ratio with respect to the center of rotation-for a suite of aspect ratios that represent both animal and aircraft wings. The vortex remains attached when the local radius is shorter than 4 chord lengths, and separates outboard on more slender wings. Like most other hovering animals, hummingbirds have wing aspect ratios between 3 and 4, much stubbier than helicopters. Our results show this makes their wings robust against flow separation, which reduces drag below values obtained with more slender wings. This revises our understanding of how aspect ratio improves performance at low Reynolds numbers.

  8. Mindfulness Promotes Educators' Efficacy in the Classroom

    Science.gov (United States)

    Abenavoli, Rachel M.; Harris, Alexis R.; Katz, Deirdre A.; Jennings, Patricia A.; Greenberg, Mark T.

    2014-01-01

    Teachers are responsible for delivering academic instruction, facilitating student learning and engagement, and managing classroom behavior. Stress may interfere with performance in the classroom, however (Tsouloupas, Carson, Matthews, Grawitch, & Barber, 2010), and recent studies suggest that stress is quite common among today's educators. In…

  9. Personalities in the Classroom: Making the Most of Them

    Science.gov (United States)

    Richardson, Rita Coombs; Arker, Emily

    2010-01-01

    Teachers' personality traits are reflected in their classroom instruction--especially in their selection of various instructional strategies, the materials they choose, and their classroom management techniques. Moreover, personality styles are positively interrelated with learning styles as well as teaching styles. In many classrooms, however,…

  10. Dynamics and Control of Three-Dimensional Perching Maneuver under Dynamic Stall Influence

    Science.gov (United States)

    Feroskhan, Mir Alikhan Bin Mohammad

    Perching is a type of aggressive maneuver performed by the class 'Aves' species to attain precision point landing with a generally short landing distance. Perching capability is desirable on unmanned aerial vehicles (UAVs) due to its efficient deceleration process that potentially expands the functionality and flight envelope of the aircraft. This dissertation extends the previous works on perching, which is mostly limited to two-dimensional (2D) cases, to its state-of-the-art threedimensional (3D) variety. This dissertation presents the aerodynamic modeling and optimization framework adopted to generate unprecedented variants of the 3D perching maneuver that include the sideslip perching trajectory, which ameliorates the existing 2D perching concept by eliminating the undesirable undershoot and reliance on gravity. The sideslip perching technique methodically utilizes the lateral and longitudinal drag mechanisms through consecutive phases of yawing and pitching-up motion. Since perching maneuver involves high rates of change in the angles of attack and large turn rates, introduction of three internal variables thus becomes necessary for addressing the influence of dynamic stall delay on the UAV's transient post-stall behavior. These variables are then integrated into a static nonlinear aerodynamic model, developed using empirical and analytical methods, and into an optimization framework that generates a trajectory of sideslip perching maneuver, acquiring over 70% velocity reduction. An impact study of the dynamic stall influence on the optimal perching trajectories suggests that consideration of dynamic stall delay is essential due to the significant discrepancies in the corresponding control inputs required. A comparative study between 2D and 3D perching is also conducted to examine the different drag mechanisms employed by 2D and 3D perching respectively. 3D perching is presented as a more efficient deceleration technique with respect to spatial costs and

  11. First steps into understanding teachers' visual perception of classroom events

    OpenAIRE

    Van den Bogert, Niek; Van Brugggen, Jan; Kostons, Danny; Jochems, Wim

    2018-01-01

    Student-teachers struggle to become competent at classroom management. To do so, Berliner (2001) and Feldon (2007) argue for the significance of speedy and accurate recognition of relevant cues for teacher action in the classroom. However, studies investigating how teachers obtain this information from the classroom are scarce. This study employed eye-tracking methodology to investigate teachers' visual perception and detection of classroom events. Results show that experienced teachers proce...

  12. The effect of alphacypermethrin-treated mesh protection against African horse sickness virus vectors on jet stall microclimate, clinical variables and faecal glucocorticoid metabolites of horses.

    Science.gov (United States)

    Page, Patrick; Ganswindt, Andre; Schoeman, Johan; Venter, Gert; Guthrie, Alan

    2017-09-09

    African horse sickness (AHS) is of importance to health and international trade in horses worldwide. During export from and transit through AHS endemic countries or zones, physical and chemical measures to protect horses from the vectors of AHS virus (AHSV) are recommended by the World Organization for Animal Health. Protection of containerized air transport systems for horses (jet stalls) with alphacypermethrin insecticide-treated high density polyethylene mesh is effective in reducing the Culicoides midge vector attack rate. In order to determine the effect of this mesh on jet stall ventilation and horse welfare under temperate climatic conditions, jet stall microclimate, clinical variables and faecal glucocorticoid metabolite (FGM) levels of 12 horses were monitored during overnight housing in either a treated or untreated stall in two blocks of a 2 × 3 randomized crossover design. Temperature difference between the treated stall and outside was significantly higher than the difference between the untreated stall and outside at 1/15 time points only (P = 0.045, r = 0.70). Relative humidity (RH) difference between the treated stall and outside did not differ from the untreated stall and outside. Temperature and RH in the treated stall were highly and significantly correlated with outside temperature (r = 0.96, P < 0.001) and RH (r = 0.95, P < 0.001), respectively. No significant differences were detected between rectal temperatures, pulse and respiratory rates of horses in the treated stall compared to the untreated stall. Mean FGM concentrations for horses housed in the treated stall peaked earlier (24 h) and at a higher concentration than horses housed in the untreated stall (48 h), but were not significantly different from baseline. No significant difference was detected in FGM concentrations when the treated and untreated stall groups were compared at individual time points up to 72 h after exiting the jet stall. Alphacypermethrin

  13. The Classroom Animal: Crickets.

    Science.gov (United States)

    Kramer, David C.

    1985-01-01

    Suggests using crickets for classroom activities, providing background information on their anatomy and reproduction and tips on keeping individual organisms or a breeding colony in the classroom. (JN)

  14. Effectiveness of classroom based crew resource management training in the intensive care unit: Study design of a controlled trial

    NARCIS (Netherlands)

    Kemper, P.F.; de Bruijne, M.C.; van Dyck, C.; Wagner, C.

    2011-01-01

    Background: Crew resource management (CRM) has the potential to enhance patient safety in intensive care units (ICU) by improving the use of non-technical skills. However, CRM evaluation studies in health care are inconclusive with regard to the effect of this training on behaviour and

  15. Effectiveness of classroom based crew resource management training in the intensive care unit: study design of a controlled trial.

    NARCIS (Netherlands)

    Kemper, P.F.; Bruijne, M. de; Dyck, C. van; Wagner, C.

    2011-01-01

    Background: Crew resource management (CRM) has the potential to enhance patient safety in intensive care units (ICU) by improving the use of non-technical skills. However, CRM evaluation studies in health care are inconclusive with regard to the effect of this training on behaviour and

  16. How Mode of Delivery Affects Comprehension of an Operations Management Simulation: Online vs Face-to-Face Classrooms

    Science.gov (United States)

    Riley, Jason M.; Ellegood, William A.; Solomon, Stanislaus; Baker, Jerrine

    2017-01-01

    Purpose: This study aims to understand how mode of delivery, online versus face-to-face, affects comprehension when teaching operations management concepts via a simulation. Conceptually, the aim is to identify factors that influence the students' ability to learn and retain new concepts. Design/methodology/approach: Leveraging Littlefield…

  17. Fostering Positive Classroom Environments: The Relationship between Teacher Qualifications, Facility Management, and Perceptions of Leadership on Student Outcomes

    Science.gov (United States)

    Marshall, Bryan Allan

    2011-01-01

    This study attempted to determine the effectiveness of schools that have highly qualified teachers, along with a well managed facility, and the administration's perception of the leadership role as an instructional specialist on the outcomes that students displayed. Also, the relationship between two instruments used to determine the quality of…

  18. Friendship and Thomas More: Using Erasmus's Letter to Ulrich von Hutten as a Tool in Developing a Classroom Management Plan

    Science.gov (United States)

    Brown, Joshua W.; Rud, A. G.

    2006-01-01

    The development of course management plans and student behavioral guidelines are a necessary component for the foundation of any school or learning community. In this article the authors explore a few of the principal foundations of creating these plans based on the qualities Erasmus described in his great friend Thomas More. Teachers and…

  19. Discipline and Rules in Four Hong Kong Kindergarten Classrooms: A Qualitative Case Study

    Science.gov (United States)

    Ho, Joyce; Grieshaber, Susan Jane; Walsh, Kerryann

    2017-01-01

    Classroom discipline is a topic of international interest and teachers are bombarded with advice regarding how to and why they should manage children's behaviour in their classrooms. This paper draws on data related to classroom discipline gathered from a detailed classroom observation schedule, teacher interviews, and field notes with four…

  20. Animal hygiene assessment of microclimate in semi open free-stall barns for dairy cows

    Directory of Open Access Journals (Sweden)

    D. Dimov

    2017-03-01

    Full Text Available Abstract. The study was conducted in three semi open free-stall barns (B1, B2, and B3 for dairy cows with capacities for 120, 120 and 500 cows, respectively, from three different dairy farms (F-1, F-2 and F-3, situated in Central Southern Bulgaria. The investigated farms had the same production system – loose housing in semi open free-stall dairy barn. For each of the farms the main microclimatic parameters – air temperature, relative humidity and speed of airflow were recorded twice a month at 10.00 h 12.00 h, 14.00 h, 16.00 h and 18.00 h of the day inside the barns in three main technological zones - above the stalls, above manure and feed alleys and outside the buildings. It was found that: a Microclimatic parameters (air temperature, air relative humidity and speed of airflow in technological zones (above the stalls, the manure and feed alleys of three semi open free-stall dairy barns meet the animal hygienic requirements for all seasons according to Regulation No. 44 (2006. Exceptions are some values of relative humidity in B1 and B2 in the spring, and in B1 in winter and summer, which are lower than the minimum humidity (50% according to the standard. b The investigated barns are characterized with poor insulation and do not provide enough isolation from the external ambient temperatures. With the exception of winter, the temperature of the air inside the buildings was lower than that outside, with minor differences for all seasons. The fans in the barns have no effect on the inside air temperature, especially in summer. There was a risk of higher temperatures mainly during the summer period. c There is no significant difference between the average temperatures, air humidity and speed of airflow in all technological zones of the investigated barns. d The largest and statistically significant is the difference between the relative air humidity outside and inside the building in Farm 3, followed by buildings in Farm 1 and 2, where the

  1. From Classroom to Wardroom: Internalizing, Integrating and Reinforcing Leadership and Management, Education and Training (LMET) Skills in the Navy

    Science.gov (United States)

    1983-12-01

    crucial respect. It refuted, by the very act of revolution which 4j inspired its founding, the precept that a certain class of men b; birth are destined...to be leaders. One of the tenets of the Enlightenment was expressed by Voltaire : "the right of command is no longer an advantage transmitted by nature...Asian Native American Other Reference: Excerpted from research interview of NPS study 105 TABLE 14 BEI INTERVIEW FORM FOR MANAGERS OF HETEROGENEOUS WORK

  2. Prediction of RNA Polymerase II recruitment, elongation and stalling from histone modification data

    Science.gov (United States)

    2011-01-01

    Background Initiation and elongation of RNA polymerase II (RNAPII) transcription is regulated by both DNA sequence and chromatin signals. Recent breakthroughs make it possible to measure the chromatin state and activity of core promoters genome-wide, but dedicated computational strategies are needed to progress from descriptive annotation of data to quantitative, predictive models. Results Here, we describe a computational framework which with high accuracy can predict the locations of core promoters, the amount of recruited RNAPII at the promoter, the amount of elongating RNAPII in the gene body, the mRNA production originating from the promoter and finally also the stalling characteristics of RNAPII by considering both quantitative and spatial features of histone modifications around the transcription start site (TSS). As the model framework can also pinpoint the signals that are the most influential for prediction, it can be used to infer underlying regulatory biology. For example, we show that the H3K4 di- and tri- methylation signals are strongly predictive for promoter location while the acetylation marks H3K9 and H3K27 are highly important in estimating the promoter usage. All of these four marks are found to be necessary for recruitment of RNAPII but not sufficient for the elongation. We also show that the spatial distributions of histone marks are almost as predictive as the signal strength and that a set of histone marks immediately downstream of the TSS is highly predictive of RNAPII stalling. Conclusions In this study we introduce a general framework to accurately predict the level of RNAPII recruitment, elongation, stalling and mRNA expression from chromatin signals. The versatility of the method also makes it ideally suited to investigate other genomic data. PMID:22047616

  3. Prediction of RNA Polymerase II recruitment, elongation and stalling from histone modification data

    Directory of Open Access Journals (Sweden)

    Chen Yun

    2011-11-01

    Full Text Available Abstract Background Initiation and elongation of RNA polymerase II (RNAPII transcription is regulated by both DNA sequence and chromatin signals. Recent breakthroughs make it possible to measure the chromatin state and activity of core promoters genome-wide, but dedicated computational strategies are needed to progress from descriptive annotation of data to quantitative, predictive models. Results Here, we describe a computational framework which with high accuracy can predict the locations of core promoters, the amount of recruited RNAPII at the promoter, the amount of elongating RNAPII in the gene body, the mRNA production originating from the promoter and finally also the stalling characteristics of RNAPII by considering both quantitative and spatial features of histone modifications around the transcription start site (TSS. As the model framework can also pinpoint the signals that are the most influential for prediction, it can be used to infer underlying regulatory biology. For example, we show that the H3K4 di- and tri- methylation signals are strongly predictive for promoter location while the acetylation marks H3K9 and H3K27 are highly important in estimating the promoter usage. All of these four marks are found to be necessary for recruitment of RNAPII but not sufficient for the elongation. We also show that the spatial distributions of histone marks are almost as predictive as the signal strength and that a set of histone marks immediately downstream of the TSS is highly predictive of RNAPII stalling. Conclusions In this study we introduce a general framework to accurately predict the level of RNAPII recruitment, elongation, stalling and mRNA expression from chromatin signals. The versatility of the method also makes it ideally suited to investigate other genomic data.

  4. Replication Stalling and Heteroduplex Formation within CAG/CTG Trinucleotide Repeats by Mismatch Repair

    KAUST Repository

    Viterbo, David

    2016-03-16

    Trinucleotide repeat expansions are responsible for at least two dozen neurological disorders. Mechanisms leading to these large expansions of repeated DNA are still poorly understood. It was proposed that transient stalling of the replication fork by the repeat tract might trigger slippage of the newly-synthesized strand over its template, leading to expansions or contractions of the triplet repeat. However, such mechanism was never formally proven. Here we show that replication fork pausing and CAG/CTG trinucleotide repeat instability are not linked, stable and unstable repeats exhibiting the same propensity to stall replication forks when integrated in a yeast natural chromosome. We found that replication fork stalling was dependent on the integrity of the mismatch-repair system, especially the Msh2p-Msh6p complex, suggesting that direct interaction of MMR proteins with secondary structures formed by trinucleotide repeats in vivo, triggers replication fork pauses. We also show by chromatin immunoprecipitation that Msh2p is enriched at trinucleotide repeat tracts, in both stable and unstable orientations, this enrichment being dependent on MSH3 and MSH6. Finally, we show that overexpressing MSH2 favors the formation of heteroduplex regions, leading to an increase in contractions and expansions of CAG/CTG repeat tracts during replication, these heteroduplexes being dependent on both MSH3 and MSH6. These heteroduplex regions were not detected when a mutant msh2-E768A gene in which the ATPase domain was mutated was overexpressed. Our results unravel two new roles for mismatch-repair proteins: stabilization of heteroduplex regions and transient blocking of replication forks passing through such repeats. Both roles may involve direct interactions between MMR proteins and secondary structures formed by trinucleotide repeat tracts, although indirect interactions may not be formally excluded.

  5. Stall, Spiculate, or Run Away: The Fate of Fibers Growing towards Fluctuating Membranes

    Science.gov (United States)

    Daniels, D. R.; Marenduzzo, D.; Turner, M. S.

    2006-09-01

    We study the dynamics of a growing semiflexible fiber approaching a membrane at an angle. At late times we find three regimes: fiber stalling, when growth stops, runaway, in which the fiber bends away from the membrane, and another regime in which spicules form. We discuss which regions of the resulting “phase diagram” are explored by (i) single and bundled actin fibers in living cells, (ii) sickle hemoglobin fibers, and (iii) microtubules inside vesicles. We complement our analysis with 3D stochastic simulations.

  6. Prediction of H.A.W.T. blade stall and performance

    Energy Technology Data Exchange (ETDEWEB)

    Giannakidis, G.; Graham, J.M.R. [Imperial College, Dept. of Aeronautics, London (United Kingdom)

    1996-09-01

    A model is being developed for the prediction of Horizontal Axis Wind Turbine blade stall and performance coupled with a simple aeroelastic analysis model. For the aerodynamic calculation a two dimensional unsteady Navier-Stokes solver on a sectional basis on the blade is coupled with a three dimensional vortex lattice wake. Pressure coefficient distributions are calculated from the two dimensional viscous flow in each blade section. The aerodynamic computations are coupled with a vibrating beam model in order to incorporate flapwise deformations of the blade. (au) 17 refs.

  7. Modeling dynamic stall on wind turbine blades under rotationally augmented flow fields

    DEFF Research Database (Denmark)

    Guntur, Srinivas; Sørensen, Niels N.; Schreck, Scott

    2016-01-01

    Experiment Phase VI experimental data, including constant as well as continuously pitching blade conditions during axial operation; (2) data from unsteady delayed detached eddy simulations (DDES) carried out using the Technical University of Denmark’s in-house flow solver Ellipsys3D; and (3) data from...... agreement between the model and the experimental data in many cases, which suggests that the current two-dimensional dynamic stall model as used in blade element momentum-based aeroelastic codes may provide a reasonably accurate representation of three-dimensional rotor aerodynamics when used in combination...

  8. A formação continuada na perspectiva da gestão e da prática na sala de aula - The continuing education in view of management and practice in the classroom

    Directory of Open Access Journals (Sweden)

    Severino Roberto de Lima

    2015-10-01

    Full Text Available Resumo Este trabalho apresenta resultados referentes à gestão do processo de Formação Continuada e a prática em sala de aula dos professores de matemática no ensino médio estadual em Palmas-TO, política de valorização profissional. Como metodologia utilizou-se a pesquisa qualitativa estruturada a partir de estudos bibliográficos e pesquisa de campo. O objetivo foi verificar se essas políticas residem como possibilidades para o fortalecimento da gestão escolar e, se têm correspondido aos anseios e expectativas desses profissionais em educação. Embora saibamos que a formação continuada é um processo contínuo, percebem-se, como possibilidades dessa formação, novas habilidades, planejamento participativo, envolvimento nas ações pedagógicas, participação na gestão e prática reflexiva em sala de aula. Palavras-chave: gestão educacional, formação continuada, matemática. THE CONTINUING EDUCATION IN VIEW OF MANAGEMENT AND PRACTICE IN THE CLASSROOM Abstract This paper presents results regarding the management of the Continuing Education and practical classroom math teachers in high school state Palmas-TO policy professional development. The methodology used was qualitative research from structured bibliographic studies and field research. The goal was to determine whether these policies reside as possibilities for strengthening school management and have been matched to the desires and expectations of professionals in education. Although we know that continuing education is an ongoing process, perceive themselves as possibilities of training, new skills, participatory planning, involvement in pedagogical actions, participation in management and reflective practice in the classroom. Key-words: education management, continuing education, mathematics.

  9. The contribution of children's self-regulation and classroom quality to children's adaptive behaviors in the kindergarten classroom.

    Science.gov (United States)

    Rimm-Kaufman, Sara E; Curby, Tim W; Grimm, Kevin J; Nathanson, Lori; Brock, Laura L

    2009-07-01

    In this study, the authors examined the extent to which children's self-regulation upon kindergarten entrance and classroom quality in kindergarten contributed to children's adaptive classroom behavior. Children's self-regulation was assessed using a direct assessment upon entrance into kindergarten. Classroom quality was measured on the basis of multiple classroom observations during the kindergarten year. Children's adaptive classroom behavior in kindergarten was assessed through teacher report and classroom observations: Teachers rated children's cognitive and behavioral self-control and work habits during the spring of the kindergarten year; observers rated children's engagement and measured off-task behavior at 2-month intervals from November to May. Hierarchical linear models revealed that children's self-regulation upon school entry in a direct assessment related to teachers' report of behavioral self-control, cognitive self-control, and work habits in the spring of the kindergarten year. Classroom quality, particularly teachers' effective classroom management, was linked to children's greater behavioral and cognitive self-control, children's higher behavioral engagement, and less time spent off-task in the classroom. Classroom quality did not moderate the relation between children's self-regulation upon school entry and children's adaptive classroom behaviors in kindergarten. The discussion considers the implications of classroom management for supporting children's early development of behavioral skills that are important in school settings.

  10. CLASSROOM RESEARCH: HOW DO UNDERGRATE STUDENTS DEFINE ORGANIZATIONAL BEHAVIOR?

    OpenAIRE

    Anita Maharani

    2017-01-01

    Classroom action research is a research of an on going process. It is not meant for producing exact conclusion, since classroom action research is an overview of what recently happened in a class. The effectiveness of classroom management depends on how lecturer design his or her teaching method, that also must compy with teaching requirement and curriculum that set up by the management of program. This research, is to define how students understand and able to deliver a correct definition of...

  11. Modelling of multiple short-length-scale stall cells in an axial compressor using evolved GMDH neural networks

    International Nuclear Information System (INIS)

    Amanifard, N.; Nariman-Zadeh, N.; Farahani, M.H.; Khalkhali, A.

    2008-01-01

    Over the past 15 years there have been several research efforts to capture the stall inception nature in axial flow compressors. However previous analytical models could not explain the formation of short-length-scale stall cells. This paper provides a new model based on evolved GMDH neural network for transient evolution of multiple short-length-scale stall cells in an axial compressor. Genetic Algorithms (GAs) are also employed for optimal design of connectivity configuration of such GMDH-type neural networks. In this way, low-pass filter (LPF) pressure trace near the rotor leading edge is modelled with respect to the variation of pressure coefficient, flow rate coefficient, and number of rotor rotations which are defined as inputs

  12. 14-3-3 Proteins regulate exonuclease 1-dependent processing of stalled replication forks.

    Directory of Open Access Journals (Sweden)

    Kim Engels

    2011-04-01

    Full Text Available Replication fork integrity, which is essential for the maintenance of genome stability, is monitored by checkpoint-mediated phosphorylation events. 14-3-3 proteins are able to bind phosphorylated proteins and were shown to play an undefined role under DNA replication stress. Exonuclease 1 (Exo1 processes stalled replication forks in checkpoint-defective yeast cells. We now identify 14-3-3 proteins as in vivo interaction partners of Exo1, both in yeast and mammalian cells. Yeast 14-3-3-deficient cells fail to induce Mec1-dependent Exo1 hyperphosphorylation and accumulate Exo1-dependent ssDNA gaps at stalled forks, as revealed by electron microscopy. This leads to persistent checkpoint activation and exacerbated recovery defects. Moreover, using DNA bi-dimensional electrophoresis, we show that 14-3-3 proteins promote fork progression under limiting nucleotide concentrations. We propose that 14-3-3 proteins assist in controlling the phosphorylation status of Exo1 and additional unknown targets, promoting fork progression, stability, and restart in response to DNA replication stress.

  13. Numerical study on a single bladed vertical axis wind turbine under dynamic stall

    Energy Technology Data Exchange (ETDEWEB)

    Bangga, Galih [Institute of Aerodynamics and Gas Dynamics, University of Stuttgart, Stuttgart (Germany); Hutomo, Go; Sasongko, Herman [Dept. of Mechanical Engineering, Institut Teknologi Sepuluh Nopember, Surabaya (Indonesia); Wiranegara, Raditya [School of Mechanical Aerospace and Civil Engineering, University of Manchester, Manchester (United Kingdom)

    2017-01-15

    The aim of this study is to investigate the flow development of a single bladed vertical axis wind turbine using Computational fluid dynamics (CFD) methods. The blade is constructed using the NACA 0012 profile and is operating under stalled conditions at tip speed ratio of 2. Two dimensional simulations are performed using a commercial CFD package, ANSYS Fluent 15.0, employing the Menter-SST turbulence model. For the preliminary study, simulations of the NACA 0012 airfoil under static conditions are carried out and compared with available measurement data and calculations using the boundary layer code XFOIL. The CFD results under the dynamic case are presented and the resulting aerodynamic forces are evaluated. The turbine is observed to generate negative power at certain azimuth angles which can be divided into three main zones. The blade vortex interaction is observed to strongly influence the flow behavior near the blade and contributes to the power production loss. However, the impact is considered small since it covers only 6.4 % of the azimuth angle range where the power is negative compared to the dynamic stall impact which covers almost 22 % of the azimuth angle range.

  14. Wind-up of a spanwise vortex in deepening transition and stall

    Energy Technology Data Exchange (ETDEWEB)

    Smith, F.T.; Bowles, R.I. [University Coll., London (United Kingdom). Dept. of Mathematics; Walker, J.D.A. [Mechanical Engineering Department, Packard Laboratory No. 19, Lehigh University, Bethlehem, PA 18015 (United States)

    2000-09-01

    A fundamental flow problem of unsteady wind-up of a spanwise vortex is studied in this theoretical work on deepening dynamic stall and transition in a boundary layer, internal layer or related unsteady motion. It examines the nonlinear evolution of the spanwise vortex produced when the local wall pressure develops a maximum or minimum, subsequent to the finite-time break-up of an interacting layer and the impact of normal pressure gradients. The evolution is controlled by an inner-outer interaction between the effects of the normal pressure gradient and the momentum jumps across and outside the vortex, which is situated near the strong inflexion point induced in the mean flow. Although the work concentrates on a particular internal-flow context, many of the flow properties found are generic and in particular apply for a more general case including external flows. Analysis and associated computations point to two main distinct trends in the vortex response, depending to a large extent on a parameter gauging the relative strengths of the above effects. The response is either an explosive one, provoking enhanced wind-up, growth and pressure in the vortex, or it is implosive, causing the vortex to shrink and virtually empty itself through unwinding, leaving little local pressure variation. A further discussion includes the after-effects of this vortex response and some of the connections with experiments and direct computations on deepening stall and transition. (orig.)

  15. Experimental Methods Applied in a Study of Stall Flutter in an Axial Flow Fan

    Directory of Open Access Journals (Sweden)

    John D. Gill

    2004-01-01

    Full Text Available Flutter testing is an integral part of aircraft gas turbine engine development. In typical flutter testing blade mounted sensors in the form of strain gages and casing mounted sensors in the form of light probes (NSMS are used. Casing mounted sensors have the advantage of being non-intrusive and can detect the vibratory response of each rotating blade. Other types of casing mounted sensors can also be used to detect flutter of rotating blades. In this investigation casing mounted high frequency response pressure transducers are used to characterize the part-speed stall flutter response of a single stage unshrouded axial-flow fan. These dynamic pressure transducers are evenly spaced around the circumference at a constant axial location upstream of the fan blade leading edge plane. The pre-recorded experimental data at 70% corrected speed is analyzed for the case where the fan is back-pressured into the stall flutter zone. The experimental data is analyzed using two probe and multi-probe techniques. The analysis techniques for each method are presented. Results from these two analysis methods indicate that flutter occurred at a frequency of 411 Hz with a dominant nodal diameter of 2. The multi-probe analysis technique is a valuable method that can be used to investigate the initiation of flutter in turbomachines.

  16. Active flow control of the laminar separation bubble on a plunging airfoil near stall

    Science.gov (United States)

    Pande, Arth; Agate, Mark; Little, Jesse; Fasel, Hermann

    2017-11-01

    The effects of small amplitude (A/c = 0.048) high frequency (πfc/U∞ = 0.70) plunging motion on the X-56A airfoil are examined experimentally at Re = 200,000 for 12° angle of attack (CL,MAX = 12.25°) . The purpose of this research is to study the aerodynamic influence of structural motion when the wing is vibrating close to its eigenfrequency near static stall. Specific focus is placed on the laminar separation bubble (LSB) near the leading edge and its control via plasma actuation. In the baseline case, the leading edge bubble bursts during the oscillation cycle causing moment stall. A collaborative computational effort has shown that small amplitude forcing at a frequency that is most amplified by the primary instability of the LSB (FLSB+= 1, Fc+= 52) generates coherent spanwise vortices that entrain freestream momentum, thus reducing separation all while maintaining a laminar flow state. Results (PIV and surface pressure) indicate that a similar control mechanism is effective in the experiments. This is significant given the existence of freestream turbulence in the wind tunnel which has been shown to limit the efficacy of this active flow control technique in a model problem using Direct Numerical Simulation. The implications of these results are discussed.

  17. Compliance with NAGCAT work practices recommendations for youth cleaning service alleys in stall barns.

    Science.gov (United States)

    Canan, B D; Asti, L; Heaney, C; Ashida, S; Renick, K; Xiang, H; Stallones, L; Jepsen, S D; Crawford, J M; Wilkins, J R

    2011-04-01

    Unintentional injury is the leading cause of death in the U.S. among persons 1 to 44 years of age. Over one million children and adolescents in the U.S. live, work, and/or play on farms, where injury risk is relatively high compared to other settings. In an attempt to reduce the number of childhood agricultural injuries occurring on farms, the North American Guidelines for Children's Agricultural Tasks (NAGCAT) was developed to assist parents or other caregivers in assigning developmentally appropriate chores to youth exposed to agricultural hazards. The results presented here are from a longitudinal study in which we obtained (self-reported) daily chore, injury, and safety behavior data from children and adolescents. We focused on one NAGCAT chore, cleaning a service alley in a stall barn, in order to estimate the extent of compliance with specific work practice recommendations contained in the NAGCAT. Our results indicated that among the four NAGCAT-recommended safety practices for cleaning service alleys in stall barns (wearing nonskid shoes, leather gloves, a respirator, and eye protection), wearing non-skid shoes was the only safety practice reported with any degree of regularity. Overall, boys were more likely to wear non-skid shoes compared to girls. In addition, older youth were generally more likely to report higher work practice compliance compared to younger youth.

  18. Ethnic Dimensions of Guatemala's Stalled Transition: A Parity-Specific Analysis of Ladino and Indigenous Fertility Regimes.

    Science.gov (United States)

    Grace, Kathryn; Sweeney, Stuart

    2016-02-01

    In some contemporary populations, fertility levels appear to plateau, with women maintaining a consistently high level of fertility for a relatively extended period. Because this plateau does not reflect the historical patterns observed in Europe, the focus of most studies on fertility patterns, mechanisms underlying the plateau and the reinstatement of a decline have not been fully explored and are not fully understood. Through the construction of fertility histories of 25,000 women using multiple years of health survey data, we analyze some of the components of stalled fertility as they pertain to Guatemala, the only Central American country to have experienced a stalled fertility decline.

  19. The effect of training on teachers' knowledge of effective classroom ...

    African Journals Online (AJOL)

    The effect of training on teachers' knowledge of effective classroom management strategies in Jos metropolis. ... Global Journal of Educational Research ... A single group pre-post test design was used, with a one-day training on classroom management techniques as the independent variable and the number of strategies ...

  20. Supporting teachers and children in schools: the effectiveness and cost-effectiveness of the Incredible Years teacher classroom management programme in primary school children: a cluster randomised controlled trial, with parallel economic and process evaluations.

    Science.gov (United States)

    Ford, Tamsin; Edwards, Vanessa; Sharkey, Siobhan; Ukoumunne, Obioha C; Byford, Sarah; Norwich, Brahm; Logan, Stuart

    2012-08-30

    Childhood antisocial behaviour has high immediate and long-term costs for society and the individual, particularly in relation to mental health and behaviours that jeopardise health. Managing challenging behaviour is a commonly reported source of stress and burn out among teachers, ultimately resulting in a substantial number leaving the profession. Interventions to improve parenting do not transfer easily to classroom-based problems and the most vulnerable parents may not be easily able to access them. Honing teachers' skills in proactive behaviour management and the promotion of socio-emotional regulation, therefore, has the potential to improve both child and teacher mental health and well-being and the advantage that it might potentially benefit all the children subsequently taught by any teacher that accesses the training. Cluster randomised controlled trial (RCT) of the Incredible Years teacher classroom management (TCM) course with combined economic and process evaluations.One teacher of children aged 4-9 years, from 80 schools in the South West Peninsula will be randomised to attend the TCM (intervention arm) or to "teach as normal" (control arm). The primary outcome measure will be the total difficulties score from the Strengths and Difficulties Questionnaire (SDQ) completed by the current class teachers prior to randomisation, and at 9, 18 and 30 months follow-up, supplemented by parent SDQs. Secondary measures include academic attainment (teacher report supplemented by direct measurement in a sub-sample), children's enjoyment of school, and teacher reports of their professional self-efficacy, and levels of burn out and stress, supplemented by structured observations of teachers classroom management skills in a subsample. Cost data for the economic evaluation will be based on parental reports of services accessed. Cost-effectiveness, using the SDQ as the measure of effect, will be examined over the period of the RCT and over the longer term using decision