Note: This page contains sample records for the topic physics contribution aux from Science.gov.
While these samples are representative of the content of Science.gov,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of Science.gov
to obtain the most current and comprehensive results.
Last update: November 12, 2013.
1

La contribution des astronomes aux mesures de précision.  

NASA Astrophysics Data System (ADS)

The system for astronomical constants includes the astronomical unit, the velocity of light and the light-time for the unit distance in the metric system. In France, at least from the 17th century, scientists had in mind to unify the units. But it is not before the time of the French Revolution that it was succeeded to adopt a unified system based on the metre. Measurements were made of an arc of meridian, from Dunkirk to Barcelona to determine the new unit as the fraction of 1 over 107 of a quarter of any part of the Earth from the north pole to the equator. On the occasion of the bicentenary of the nomenclature of the metric system (1795), the Paris Observatory has presented during more than six months in 1995, mostly for students, manuscripts, documents related to the subject, in its galeries on the first floor of the Perrault building. The exhibition ended with the 1960 and 1983 definitions of the meter to which the Paris Observatory has contributed. For astronomers it was recalled the reason for which the Angström had to be considered as not more usable, being only close to the fraction 1/1010 of the meter.

Debarbat, S.

2

Contributions of Egyptian Women in Physics (abstract)  

NASA Astrophysics Data System (ADS)

Physics is a dynamic, global field. Progress in research motivates scientists to explore new areas and find useful applications for their work. Femtosecond ultrashort pulsed lasers and progress in nanostructures to study the properties of extremely dense matter, as well as one-dimensional materials, are two examples of innovations that encourage students and scientists-male and female-to pursue physics. Young Egyptian women's contributions to physics grew from 46% in 2003 to 69% in 2008. This paper discusses the role of women in physics in Egypt; presents statistics regarding their contributions and presence at Egyptian universities and institutes; and gives information about their decision making leadership roles. Ideas, applicable in Egypt as well as in developing countries, to address problems facing women are raised.

El Nadi, Lotfia

2009-04-01

3

Venus Express Contribution to Space Plasma Physics  

NASA Astrophysics Data System (ADS)

Venus Express spacecraft (VEX) is magnetically non-clean spacecraft with a small plasma package that consists of FGM magnetometer and plasma instrument ASPERA. System Identification based methodology have been used to separate spacecraft generated interferences and natural signal. The implemented procedure of data cleaning resulted in a high quality magnetic field measurements. VEX FGM contributed not only to many aspects of Venus-Solar Wind interaction but also to fundamental plasma physics problems such physics of collisionless shocks, K-H intability and dynamics of mirror waves. These and other findings of VEX FGM are reviewed.

Balikhin, M.

2008-12-01

4

Contribution of physical education to overall physical activity.  

PubMed

For many children, physical activity (PA) during physical education (PE) lessons provides an important opportunity for being physically active. Although PA during PE has been shown to be low, little is known about the contribution of PA during PE to overall PA. The aim was therefore to assess children's PA during PE and to determine the contribution of PE to overall PA with special focus on overweight children. Accelerometer measurements were done in 676 children (9.3?±?2.1 years) over 4-7 days in 59 randomly selected classes. Moderate-and-vigorous PA (MVPA;???2000 counts/min) during PE (MVPAPE ), overall MVPA per day (MVPADAY ), and a comparison of days with and without PE were calculated by a regression model with gender, grade, and weight status (normal vs overweight) as fixed factors and class as a random factor. Children spent 32.8?±?15.1% of PE time in MVPA. Weight status was not associated to MVPAPE . MVPAPE accounted for 16.8?±?8.5% of MVPADAY , and 17.5?±?8.2% in overweight children. All children were more active on days with PE than on days without PE (differences: 16.1?±?29.0?min of MVPADAY ; P???0.001; 13.7?±?28.0?min for overweight children). Although MVPAPE was low, PE played a considerable role in providing PA and was not compensated by reducing extracurricular MVPA. PMID:22151355

Meyer, U; Roth, R; Zahner, L; Gerber, M; Puder, J J; Hebestreit, H; Kriemler, S

2011-12-12

5

Fundamental Physics in Space: the French Contribution  

NASA Astrophysics Data System (ADS)

Relativity and quantum physics provide the framework for contemporary physics in which the relations between matter, space and time have been radically rethought during the past century. Physicists however cannot be satisfied with these two distinct theories and they are seeking to unify them and thereby quantify the gravitational field. The key of this research lies in the highly precise study of the gravitational laws. Space environment, allowing large distance experiments and isolation from terrestrial noise, is the ideal place for carrying out very precise experiments on gravitation and is highly suitable for seeking new interactions that could show up in low-energy conditions. Since 1993 when the scientific community gave its first recommandations, CNES has been working out with french research laboratories on a variety of advanced technical instrumentations needed to fulfill such space experiments, especially in the fields of electrostatic microaccelerometers, cold atom clocks and cold atom inertial sensors, optical datation, optical interferometry and drag-free control. A number of Fundamental Physics projects are now under progress, in the frame of the national programme and the participation to the ESA programme, such as : -the MICROSCOPE microsatellite project aimed at testing the Equivalence Principle between inertial mass and gravitational mass at a high level of precision, which is the fourth CNES scientific project based on the MYRIADE microsatellite series, -the PHARAO cold-atom clock which is the heart of the ACES (Atomic Clock Ensemble in Space) european project located on an external pallett of the International Space Station, together with a swiss H- MASER and a micro-wave link making comparison with ground clocks, aimed at relativistic tests and measurement of universal constants, -the T2L2 optical link allowing to compare ultra-stable and ultra-precise clocks, -contribution to the AMS spectrometer aimed at the search for cosmic antimatter, on the external part of the International Space Station, -participation in the LISA corner-stone mission of ESA for direct detection and measurement of gravitational waves by interferometry and proposal for the SMART-2 demonstrator, -participation in the HYPER assessment study, concerning High Precision Cold Atom Interferometry in Space, on a dedicated satellite, submitted to ESA as a flexible mission. Let's hope that the turn of this century will be favourable to the achievement of Fundamental Physics studies in new experimental conditions provided by Space which will give highly precised measurements and allow to test theoretical predictions. Development of such cutting-edge technology will also have significant impact on other disciplines such as astronomy, time and frequency metrology, gravimetry...

Leon-Hirtz, S.

2002-01-01

6

Contributions of Natural Environments to Physical Activity  

Microsoft Academic Search

\\u000a The idea that nearby nature stimulates people to be more physically active is quite popular. In this chapter the literature\\u000a regarding the link between physical activity and the residential environment is scrutinized. More specifically, after introducing\\u000a the main concepts and a theoretical framework the evidence regarding three categories of activity is examined: physical activity\\u000a in general, walking and cycling (mainly

Sjerp Vries; Thomas Claßen; Stella-Maria Eigenheer-Hug; Kalevi Korpela; Jolanda Maas; Richard Mitchell; Peter Schantz

7

Contributions of 20th Century Women to Physics  

NSDL National Science Digital Library

"There are more female physicists than people know about!" This claim is made by the producers of this well-documented archive of citation and biographical information about 20th century women physicists, led by UCLA Physics Professor Emeritus, Nina Byers. This archive contains information about more than 50 women in the past century (to 1976) who have made original and important contributions to physics. The archive was compiled by UCLA staff and others "active in fields in which contributions have been made." Details about important contributions, publications, honors, employment history, and references are provided for each woman included in the database. Visitors can search the archive by name or by specific physics fields. A database of the print references used to compile information about the women cited is also available.

8

Contributions of athletic identity to child and adolescent physical activity  

Technology Transfer Automated Retrieval System (TEKTRAN)

Identity theorists maintain that domain-specific self-concepts help explain the differential investment of people's time and effort in various activities. This study examined the contribution of athletic identity and three key demographic variables to physical activity and sports team participation...

9

Children's Physical Activity: The Contribution of Playing and Walking  

ERIC Educational Resources Information Center

This paper draws on research in which 200 children were fitted with motion sensors and asked to keep travel and activity diaries. The findings show that walking and playing away from home can contribute significantly to children's volume of physical activity, with consequent implications for their health. Not only do both playing and walking…

Mackett, Roger L.; Paskins, James

2008-01-01

10

"Physical Education Makes You Fit and Healthy". Physical Education's Contribution to Young People's Physical Activity Levels  

ERIC Educational Resources Information Center

|The purpose of this study was to assess physical activity levels during high school physical education lessons. The data were considered in relation to recommended levels of physical activity to ascertain whether or not physical education can be effective in helping young people meet health-related goals. Sixty-two boys and 60 girls (aged 11-14…

Fairclough, S.; Stratton, G.

2005-01-01

11

Contribution of Athletic Identity to Child and Adolescent Physical Activity  

PubMed Central

Background Identity theorists maintain that domain-specific self-concepts help explain the differential investment of people’s time and effort in various activities. Purpose This study examined the contribution of athletic identity and three key demographic variables to physical activity and sports team participation. Methods Students in Grades 4–5 (n=391, mean age 9.9 years, range 8–13 years, collected in 2003) and Grades 7–8 (n=948, mean age 13.6 years, range 11–15 years, collected in 2002 and 2006) completed the 40-item Athletic Identity Questionnaire, which measures self-perceptions of athletic appearance; competence; importance of physical activity and sports; and encouragement for activity from parents, teachers, and friends. Hierarchic multiple regression analyses in 2008 assessed the effects of athletic identity, race/ethnicity group, gender, and overweight status on 7-day moderate-to-vigorous physical activity (MVPA) and organized sport team participation in each age group. Results In children and adolescents, the global score of athletic identity was independently, positively related to MVPA (p<0.0001, p<0.0001, respectively) and team participation (p<0.0001, p<0.0001, respectively), after controlling for demographic variables. More variance in MVPA was explained in children (23%) than in adolescents (5%), in contrast to team sports (5% in children, 15% in adolescents). In the subscale analyses, positive relationships for appearance, competence, importance, and parental encouragement persisted independent of demographic factors. Conclusions Results support the role of athletic self-concept in promoting physical activity and organized sport participation in children and adolescents.

Anderson, Cheryl B.; Masse, Louise C.; Zhang, Hong; Coleman, Karen J.; Chang, Shine

2009-01-01

12

Some contributions of MAGIC to the physics ofcosmic rays  

NASA Astrophysics Data System (ADS)

Cosmic ray interactions can be investigated indirectly in ? ray astronomy, with the observation of spectral and morphological features of certain classes of sources. MAGIC is a stereoscopic system of two ? ray telescopes, located at La Palma (Canaries), with access to the energy window between 50 GeV and 30 TeV. Sources of high relevance for the study of very high energy hadronic interactions are active galactic nuclei, as blazars and radio galaxies. MAGIC has detectedabout fifty such extragalactic objects; we will present some where theemission is explained with accelerated hadrons in interaction with ambient photons. We will also mention cosmic ray acceleration in galaxy clusters. Other than that, hadron-hadron interactions are supposed to take place in some supernova remnants in interaction with surrounding molecular clouds; we will show some results, in connection with cosmic rays of galactic origin. Finally, about other possible components, wewill mention the measurement of the diffuse electron and positron spectrum. Trustingly, the close connection between particle physics and astrophysics will contribute in future years to many new interesting observations.

Gozzini, S. R.

2013-06-01

13

Hans Bethe's Contributions to Solid-State Physics  

Microsoft Academic Search

Hans Bethe's doctoral research was primarily in solid-state physics. During the late 1920's and early 1930's he played a major role in developing the new quantum theory of solids. Though nuclear physics became his main interest in the mid 1930's, he continued to write papers in solid-state physics into the late 1940's, and remained interested in the subject all his

N. David Mermin; Neil W. Ashcroft

2006-01-01

14

Factors Contributing to Achievement in Statewide Physics Competition.  

ERIC Educational Resources Information Center

This study was conducted to relate personal, cognitive, and school variables to physics achievement. The sample consisted of 435 students participating in the 1985 Mississippi State University Annual Physics Competition. The Student Background Questionnaire was planned and developed to collect information on each variable examined. The predictor…

Harpole, Sandra; Gifford, Vernon

15

Conceptual and physical object qualities contribute differently to motor affordances  

Microsoft Academic Search

Priming studies have demonstrated that an object’s intrinsic and extrinsic qualities (size, orientation) influence subsequent motor behavior thus suggesting that these object qualities ‘afford’ actions that are congruent with the prime. We present four experiments that aim to evaluate the relative effect of conceptual and physical object qualities on action priming. In Experiment 1 equally graspable known and unknown tools

G. Vingerhoets; K. Vandamme; A. Vercammen

2009-01-01

16

Physics of the gluon-helicity contribution to proton spin.  

PubMed

The total gluon helicity in a polarized proton, measurable in high-energy scattering, is shown to be the large momentum limit of a gauge-invariant but nonlocal, frame-dependent gluon spin E[over ?]×A[over ?]_{?} in QCD. This opens a door for a nonperturbative calculation of this quantity in lattice QCD and also justifies using free-field expressions in the light-cone gauge as physical observables. PMID:24074075

Ji, Xiangdong; Zhang, Jian-Hui; Zhao, Yong

2013-09-10

17

Physics of the Gluon-Helicity Contribution to Proton Spin  

NASA Astrophysics Data System (ADS)

The total gluon helicity in a polarized proton, measurable in high-energy scattering, is shown to be the large momentum limit of a gauge-invariant but nonlocal, frame-dependent gluon spin E?×A?? in QCD. This opens a door for a nonperturbative calculation of this quantity in lattice QCD and also justifies using free-field expressions in the light-cone gauge as physical observables.

Ji, Xiangdong; Zhang, Jian-Hui; Zhao, Yong

2013-09-01

18

Contribution of occupational physical activity toward meeting recommended physical activity guidelines: United States, 2007.  

PubMed

Regular physical activity helps maintain healthy weight and reduces the likelihood of developing chronic diseases. The 2008 Physical Activity Guidelines for Americans (1) are derived from the most recent scientific review of physical activity health benefits and do not differentiate among physical activity for leisure, transportation, work, or other purposes. To examine the potential influence of occupational physical activity on meeting minimum weekly aerobic physical activity guidelines, the Washington State Department of Health (WADOH) analyzed demographic patterns in physical activity levels with and without consideration of occupational physical activity using 2007 Behavioral Risk Factor Surveillance System (BRFSS) data. This report describes the results of that analysis, which indicated that, approximately two thirds (64.3%) of U.S. adults met minimum physical activity guidelines through nonoccupational physical activity. When occupational physical activity (defined as reported work activity of mostly walking or heavy labor) was considered, an additional 6.5% of adults likely met the guidelines. The increase was greatest for Hispanic men (14.4%) and men with less than a high school education (15.9%). Public health agencies conducting surveillance of population physical activity levels also should consider including occupational physical activity, which will help to identify demographic groups for targeted programs that increase physical activity. PMID:21617631

2011-05-27

19

Contributions of basic nuclear physics to the nuclear waste management  

NASA Astrophysics Data System (ADS)

Nuclear fission is presently a contested method of electricity production. The issue of nuclear waste management stands out among the reasons why. On the other hand, the nuclear industry has demonstrated its capacity to reliably generate cheap electricity while producing negligible amounts of greenhouse gases. These assets explain why this form of energy is still considered among the options for the long term production of electricity at least in developed countries. However, in order to tackle the still not adequately answered question of the waste, new schemes may have to be considered. Among those which have been advanced recently, the less polluting cycles such as those based on Thorium rather than Uranium and/or the transmutation of the minor actinides and some long lived fission products of the present cycle have been actively investigated. In both cases, it turns that the basic knowledge underlying these methods is either missing or incomplete. This situation opens a window of opportunity for useful contributions from basic nuclear physicists. This article describes some of them and presents the ongoing activities as well as some of the projects put forth for the short or medium term. .

Flocard, Hubert

2002-04-01

20

The Contribution of Secondary School Physical Education to Lifetime Physical Activity  

Microsoft Academic Search

The promotion of lifetime participation in physical activity is a major goal of physical education, which this study considered in the context of curricular and extracurricular opportunities. Questionnaires focusing on PE provision were completed by 51 heads of physical education (HoPE). Results showed that team games predominated over lifetime activities in Key Stages 3 and 4 (p < .01), while

Stuart Fairclough; Gareth Stratton; Graham Baldwin

2002-01-01

21

Exploring what contributes to the knowledge development of secondary physics and physical science teachers in a continuous professional development context  

NASA Astrophysics Data System (ADS)

This dissertation used qualitative methodologies, specifically phenomenological research, to investigate what contributes to the development of pedagogical content knowledge (PCK) of physics and physical science teachers who participate in a content-specific continuous professional development program. There were five participants in this study. The researcher conducted participant observations and interviews, rated participants degree of reformed teaching practices using the Reformed Teaching Observation Protocol, surveyed participants' self-efficacy beliefs using the Science Teacher Efficacy Belief Instrument "A," and rated participants'' level of PCK using the PCK Rubrics.. All data were analyzed, and a composite description of what contributes to physics and physical science teachers' PCK development through a continuous professional development program emerged. A theory also emerged from the participants' experiences pertaining to how teachers' assimilate new conditions into their existing teaching schema, how conditions change teachers' perceptions of their practice, and outcomes of teachers' new ideas towards their practice. This study contributed to the literature by suggesting emergent themes and a theory on the development of physics and physical science teachers' PCK. PCK development is theorized to be a spiral process incorporating new conditions into the spiral as teachers employ new science content knowledge and pedagogical practices in their individual classroom contexts.

Nelms, April Wagnon

22

Communication presentee aux \\  

Microsoft Academic Search

This paper will present salient findings of a 5 year doctoral research on criminal career development among Maltese male youth. Although the original work addressed various aspects of criminal career development, this paper will highlight those aspects of the research findings that throw light on social exclusionary processes in Maltese society that contribute to criminality. The paper explores the criminal

Marilyn Clark

23

Friluftsliv: a contribution to equity and democracy in Swedish Physical Education? An analysis of codes in Swedish Physical Education curricula  

Microsoft Academic Search

During the last decade, expanding research investigating the school subject Physical Education (PE) indicates a promotion of inequalities regarding which children benefit from PE teaching. Outdoor education and its Scandinavian equivalent friluftsliv, is a part of the PE curriculum in many countries, and these practices have been claimed to have the potential to contribute to more equity in PE teaching.

Erik Backman

2011-01-01

24

The Knight of the Quantum: On the Contribution of D.I. Blokhintsev to Quantum Physics1  

Microsoft Academic Search

A concise survey of the contribution of D.I. Blokhintsev to the quantum physics, including solid state physics, physics of metals, surface physics, statistical physics and optics is given. These achievements have been considered in the context of modern development of these fields of physics. The name of Corresponding Member of the Academy of Sciences of the USSR D. I. Blokhintsev

A. L. Kuzemsky

25

An Analysis of Factors Contributing to Achievement in Physics of Secondary Students in Mississippi Schools.  

ERIC Educational Resources Information Center

Designed to examine the factors that contribute to student achievement, this study focused specifically on the relationship between physics achievement and selected teacher characteristics, student characteristics, and school and district characteristics. Questionnaires and attitude surveys were completed by 39 randomly selected Mississippi…

Harpole, Sandra H.; And Others

26

New physics in ?' from chromomagnetic contributions and limits on left-right symmetry  

NASA Astrophysics Data System (ADS)

New physics in the chromomagnetic flavor changing transition s?dg* can avoid the strong Glashow-Iliopoulos-Maiani suppression of the standard model and lead to large contributions to CP-violating observables, in particular to the ?' parameter, that we address here. We discuss the case of the left-right symmetric models, where this contribution implies bounds on the phases of the right-handed quark mixing matrix, or in generic models with large phases a strong bound on the left-right symmetry scale. To the leading order, a numeric formula for ?' as a function of the short-distance coefficients for a wide class of models of new physics is given.

Bertolini, S.; Eeg, J. O.; Maiezza, A.; Nesti, F.

2012-11-01

27

Contribution of Individual and Environmental Factors to Physical Activity Level among Spanish Adults  

Microsoft Academic Search

BackgroundLack of physical activity (PA) is a major risk for chronic disease and obesity. The main aims of the present study were to identify individual and environmental factors independently associated with PA and examine the relative contribution of these factors to PA level in Spanish adults.Methodology\\/Principal FindingsA population-based cross-sectional sample of 3,000 adults (18–75 years old) from Gran Canaria (Spain)

José Antonio Serrano-Sanchez; Angela Lera-Navarro; Cecilia Dorado-García; Juan José González-Henriquez; Joaquin Sanchis-Moysi

2012-01-01

28

The contribution of dance to daily physical activity among adolescent girls  

PubMed Central

Background Structured physical activity (PA) programs are well positioned to promote PA among youth, however, little is known about these programs, particularly dance classes. The aims of this study were to: 1) describe PA levels of girls enrolled in dance classes, 2) determine the contribution of dance classes to total moderate-to-vigorous physical activity (MVPA), and 3) compare PA between days with a dance class (program days) and days without a dance class (non-program days). Methods Participants were 149 girls (11-18 years) enrolled in dance classes in 11 dance studios. Overall PA was assessed with accelerometry for 8 consecutive days, and girls reported when they attended dance classes during those days. The percent contribution of dance classes to total MVPA was calculated, and data were reduced to compare PA on program days to non-program days. Data were analyzed using mixed models, adjusting for total monitoring time. Results Girls engaged in 25.0 ± 0.9 minutes/day of MVPA. Dance classes contributed 28.7% (95% CI: 25.9%-31.6%) to girls' total MVPA. Girls accumulated more MVPA on program (28.7 ± 1.4 minutes/day) than non-program days (16.4 ± 1.5 minutes/day) (p < 0.001). Girls had less sedentary behavior on program (554.0 ± 8.1 minutes/day) than non-program days (600.2 ± 8.7 minutes/day) (p < 0.001). Conclusions Dance classes contributed a substantial proportion (29%) to girls' total MVPA, and girls accumulated 70% more MVPA and 8% less sedentary behavior on program days than on non-program days. Dance classes can make an important contribution to girls' total physical activity.

2011-01-01

29

New physics contribution to Bs??+?- within R-parity violating supersymmetric models  

NASA Astrophysics Data System (ADS)

We revisit the problem of new physics (NP) contribution to the branching ratio of the Bs??+?- decay in light of the recent observation of this decay by LHCb. We consider R-parity violating (RPV) supersymmetric models as a primary example—recently one has reported stringent constraints on the products of the RPV coupling constants that account for the Bs??+?- transition at the tree level. We argue that despite the fact that the LHCb measurement of the B(Bs??+?-) is in a remarkable agreement with the Standard Model (SM) prediction, there is still a room for a significant new physics contribution to the B(Bs??+?-), as the sign of the Bs??+?- transition amplitude may be opposite to that of the Standard Model; alternatively the amplitude may have a large phase. We conduct our analysis mainly for the case of real RPV couplings. We find that taking into account the scenario with the sign flip of the Bs??+?- amplitude (as compared to that of the SM) makes the bounds on the RPV coupling products significantly weaker. Also, we discuss briefly how our results are modified if the RPV couplings have large phases. In particular, we examine the dependence of the derived bounds on the phase of the NP amplitude.

Yeghiyan, Gagik

2013-08-01

30

Can exergaming contribute to improving physical activity levels and health outcomes in children?  

PubMed

Physical inactivity among children is a serious public health problem. It has been suggested that high levels of screen time are contributory factors that encourage sedentary lifestyles in young people. As physical inactivity and obesity levels continue to rise in young people, it has been proposed that new-generation active computer- and video-console games (otherwise known as "exergaming") may offer the opportunity to contribute to young people's energy expenditure during their free time. Although studies have produced some encouraging results regarding the energy costs involved in playing active video-console games, the energy costs of playing the authentic versions of activity-based video games are substantially larger, highlighting that active gaming is no substitute for real sports and activities. A small number of exergaming activities engage children in moderate-intensity activity, but most do not. Only 3 very small trials have considered the effects of exergaming on physical activity levels and/or other health outcomes in children. Evidence from these trials has been mixed; positive trends for improvements in some health outcomes in the intervention groups were noted in 2 trials. No adequately powered randomized, controlled trial has been published to date, and no trial has assessed the long-term impact of exergaming on children's health. We now need high-quality randomized, controlled trials to evaluate the effectiveness and sustainability of exergaming, as well as its clinical relevance; until such studies take place, we should remain cautious about its ability to positively affect children's health. PMID:19596728

Daley, Amanda J

2009-07-13

31

Empowering People, Facilitating Community Development, and Contributing to Sustainable Development: The Social Work of Sport, Exercise, and Physical Education Programs  

ERIC Educational Resources Information Center

Do sport, exercise, and physical education (SEPE) professionals empower the people they serve and contribute to community development? Do SEPE policies, programs, and practices contribute to sustainable economic and social development, making them worthwhile governmental investments? These questions frame the ensuing analysis. Empowerment-oriented…

Lawson, Hal A.

2005-01-01

32

Contribution of Physical Development and Muscular Strength to the Motor Performance Capacity of 7 to 12 Year Old Boys  

Microsoft Academic Search

The contribution of selected physical development and muscular strength measures to general motor performance capacity was investigated in 55 seven to twelve year old boys. The physical development variables were height, body weight and fat-free body. Right and left hand strength, and static leg extension force of the right, left and both legs. simultaneously were used as measures of strength.

Janet B. Teeple; T. G. Lohman; J. E. Misner; R. A. Boileau; B. H. Massey

1975-01-01

33

The Contribution of Simulations to the Practical Work of Foundation Physics Students at the University of Limpopo  

ERIC Educational Resources Information Center

|Purpose: Practical work is regarded as an essential part of learning; hence most tertiary institutions have included a practical component in their physics courses. There is a concern about the effectiveness of the practical work in most universities. The purpose of this study is to assess the contributions of simulations on 20 Foundation Physics

Mhlongo, Motlalepula Rebecca; Kriek, Jeanne; Basson, Ilsa

2011-01-01

34

Is It Really Just a Social Construction?: The Contribution of the Physical Environment to Sense of Place  

Microsoft Academic Search

Although sense of place definitions nominally include the physical environment, much research has emphasized the social construction of sense of place and neglect the potentially important contributions of the physical environment to place meanings and attachment. This article presents research that tests several models that integrate (1) characteristics of the environment, (2) human uses of the environment, (3) constructed meanings,

RICHARD C. STEDMAN

2003-01-01

35

REFLECTIONS ON MY CONTRIBUTIONS TO PARTICLE PHYSICS AND RECENT EXPERIMENTAL RESULTS FROM RHIC.  

SciTech Connect

My talk today will be composed of two parts. The first part will consist of a summary of some of my experimental contributions over the years. It will not be exhaustive but will highlight the findings that had relevance to the progress of our understanding of particle physics as it has evolved over the years. This section will be divided into three periods: Early, Intermediate and Late, with an in depth discussion of a few of the more significant results. The second part will consist of a discussion of the recently completed Relativistic Heavy Ion Collider (RHIC) machine at Brookhaven National Laboratory (BNL). This will encompass the parameters of the accelerator and some of the interesting and exciting early experimental results emanating from this machine.

SAMIOS,N.P.

2002-01-18

36

Sillitoe, Storey, Hines: their contribution to the sociology of sport and physical education.  

PubMed

The place of sporting activity in literature is reviewed and attention is drawn to the outstanding depth and quality of much of the American writing in this genre. The focus of attention, however, in this paper, is the contribution of contemporary English literature. In recent years a number of novels, short stories and plays have translated sport into dramatic terms as well as placing such action within a recognisable and definable sociological framework. Selected writings by English authors Sillitoe, Storey and Hines are studied and examined to illustrate the many sources available to identify, describe, analyse and complement academic and empirical researches in the sociology of sport and physical education. There is unlimited scope for sports literature (especially in the North American situation) to provide a viable tool for sociological investigation. PMID:533632

Crawford, S A

1979-06-01

37

Combatting cancer in the third millennium--the contribution of medical physics.  

PubMed

In this invited opening Plenary Lecture at the 1st European Conference on Medical Physics, I indicated some of the roles of medical physics, and specifically medical radiation therapy physics, in the development of improved cancer care for the third millennium. It is said that you are only asked to predict the future if you are seriously old and/or will not be around long enough to know if you were correct. Hopefully, however, I will be able to contribute to this field for many years to come and many of my suggestions will be enacted. "Crystal ball gazing" is, however, a very unscientific process. Scientists are trained to study and analyse situations, report their findings and stop at that. "Future gazing" is not predicting the short-term developments; it is about being bold, radical and stating what today is impossible or almost unthinkable. So-called "scientific prophets" can be entertaining (which I also hope I was in this lecture) but at worst look egocentric and possibly ridiculous. I seem to have survived three previous requests to make scientific predictions [Webb S. The future of photon external-beam radiotherapy: the dream and the reality. Physica Medica 2001;17(4):207-15; Webb S. Radiotherapy physics: the next ten years of technical development. Imaging and Oncology 2005;1:43-50; Webb S, Evans PM. Innovative techniques in radiation therapy editorial, overview and crystal ball gaze to the future. In: Webb S, Evans PM, editors. Innovative techniques in radiation therapy. Seminars in Radiation Oncology 2006;16(4):193-8]. I proposed that important progress usually comes from two quite distinct directions. Firstly, there is "big hit science", that is discoveries or inventions so important that the medical world changes forever because of them. These are what people remember, what reaches the media and what make some people household names. These are rare. Secondly, there is "incremental development" which is how the vast majority of scientists work. Small parts of a big problem are dissected out, solved and contribute to the progress of a bigger field. Sometimes the second way leads to the first, often unplanned to be so. To set the scene I briefly told the story of a few famous "big hit science" stories in which medical physicists have played a leading role--the invention of X-ray computed tomography (CT), the development of intensity-modulated radiation therapy (IMRT) and the invention of the emission tomography imaging modalities: single-photon emission computed tomography (SPECT) and positron emission tomography (PET). I suggested some of the areas I consider important for development. Some are fairly easy to identify and others are more speculative and unusual. I suggested that the goal of medicine and supporting science is to ensure that people live long and die quickly and I contrasted this with the past scenarios. Digressing to philosophy I suggested that there may be a difficulty in that the highly developed world works mainly to make itself even more developed and that many developed governments and aspiring medical physicists may not be as interested as they should be in assisting developing countries. There is therefore, sadly, likely to be an ongoing imbalance of resources. Scientific publishing is also at cross roads where the need to act independently, openly and with wide availability clashes somewhat with the need to generate revenue and support learned societies. Turning to detailed observations, I described how I think the following fields can be advanced: (1) improving the diagnosis of disease, (2) improving the planning of radiotherapy, (3) improving the delivery of radiation treatment and (4) improving the assessment of response to treatment. I ended on a highly philosophical note, which is somewhat critical of how much practical medical physics is currently organised in universities and hospitals and I suggested what should be the real agenda for scientific progress. PMID:18295523

Webb, Steve

2008-03-04

38

Can one detect new physics in I=0 and/or I=2 contributions to the decays B???  

NASA Astrophysics Data System (ADS)

We study the effects of new-physics contributions to B??? decays, which can be parametrized as four new complex quantities. A simple analysis is provided by utilizing the reparametrization invariance of the decay amplitudes. We find that six quantities can be reabsorbed into the definitions of Standard Model-like parameters. As a result, the usual isospin analysis provides only two constraints on new physics which are independent of estimates for the Standard Model contributions. In particular, we show that one is not sensitive to new physics affecting the I=0 amplitudes. On the other hand, I=2 new physics can be detected, and its parameters can be measured by using independent determinations of the weak phases. We obtain constraints on these new-physics parameters through a fit to the current experimental data.

Baek, Seungwon; Botella, F. J.; London, David; Silva, João P.

2005-08-01

39

Untangling the physical contributions to instantaneous normal mode approximations: Inhomogeneous broadening, motional narrowing, and energy relaxation  

NASA Astrophysics Data System (ADS)

An instantaneous normal mode (INM) approach to vibrational lineshapes, including motional narrowing, is presented. Simulations and calculations are carried out for a diatomic in Lennard-Jones solvent as a function of vibrational frequency, with an emphasis on determining the contributions of different physical relaxation mechanisms. The velocity correlation of a bond is easily related to a bond-weighted INM density of states, containing both resonant energy relaxation (ER) and unnarrowed inhomogeneous broadening. An effective weighted density of states or static spectrum, the distribution of an effective time-dependent frequency ?(t), is introduced and proposed as a measure of the inhomogeneous linewidth only. It is found that the vibrational INM are in the motionally narrowed or fast modulation limit; motional narrowing of INM cannot be ignored. A dynamic spectrum containing only the motionally narrowed inhomogeneous spectrum and corresponding pure dephasing relaxation is isolated. Reintroducing energy relaxation results in excellent agreement with simulation. The validity of INM approximations and the relative importance of different relaxation mechanisms as a function of vibrational frequency is analyzed. It is suggested that, through INM, a role may be found for motional narrowing in intermolecular dynamics.

Kalbfleisch, T.; Keyes, T.

1998-05-01

40

The contribution of preschool playground factors in explaining children's physical activity during recess  

Microsoft Academic Search

BACKGROUND: Low levels of physical activity are characteristic in preschoolers. To effectively promote physical activity, it is necessary to understand factors that influence young children's physical activity. The present study aimed to investigate how physical activity levels are influenced by environmental factors during recess in preschool. METHODS: Preschool playground observations and pedometry during recess were carried out in 39 randomly

Greet Cardon; Eveline Van Cauwenberghe; Valery Labarque; Leen Haerens; Ilse De Bourdeaudhuij

2008-01-01

41

Moving to Inclusion. Active Living through Physical Education: Maximizing Opportunities for Students with a Disability = Integration en Mouvement. La vie active par l'education physique: Multipliez les possibilities offertes aux eleves ayant un handicap.  

ERIC Educational Resources Information Center

|This document is composed of 10 manuals which provide both general and specific guidelines to facilitate the inclusion of Canadian students with disabilities in physical education programs. An introductory manual identifies general concepts, strategies, and practical approaches that can be used in an inclusive physical education program. It…

Active Living Alliance for Canadians with a Disability, Gloucester (Ontario).

42

The Contribution of Physical Education to the General Development of Children with Special Educational Needs.  

ERIC Educational Resources Information Center

|Among 16 components of a good physical education program for handicapped children are the following: physical fitness, motor development, perceptual development, body awareness, hand dominance, perception, problem solving, creativity, memory, concentration, discipline, and confidence. (DB)|

Miles, Ann; Knight, Elizabeth

1987-01-01

43

The Contribution of Physical Education to the General Development of Children with Special Educational Needs.  

ERIC Educational Resources Information Center

Among 16 components of a good physical education program for handicapped children are the following: physical fitness, motor development, perceptual development, body awareness, hand dominance, perception, problem solving, creativity, memory, concentration, discipline, and confidence. (DB)

Miles, Ann; Knight, Elizabeth

1987-01-01

44

Combatting cancer in the third millennium – The contribution of medical physics  

Microsoft Academic Search

In this invited opening Plenary Lecture at the 1st European Conference on Medical Physics, I indicated some of the roles of medical physics, and specifically medical radiation therapy physics, in the development of improved cancer care for the third millennium. It is said that you are only asked to predict the future if you are seriously old and\\/or will not

Steve Webb

2008-01-01

45

Daily physical activity and its contribution to the health-related quality of life of ambulatory individuals with chronic stroke  

Microsoft Academic Search

BACKGROUND: Participation in daily physical activity (PA) post-stroke has not previously been investigated as a possible explanatory variable of health-related quality of life (HRQL). The aims were 1) to determine the contribution of daily PA to the HRQL of individuals with chronic stroke and 2) to assess the relationship between the functional ability of these individuals to the amount of

Debbie Rand; Janice J Eng; Pei-Fang Tang; Chihya Hung; Jiann-Shing Jeng

2010-01-01

46

How a gender gap in belonging contributes to the gender gap in physics participation  

NASA Astrophysics Data System (ADS)

A great deal of research indicates that feeling a secure sense of belonging in academic settings is critical to students' achievement. In the current work, we present data collected over multiple semesters of a calculus-based introductory physics class indicating that women feel a lower sense of belonging than men in physics. This finding is important because our data also indicate that having a strong sense of belonging in physics positively predicts the degree to which all students see the value of physics in their daily life (an outcome that predicts motivation and persistence in achievement settings) as well as performance on exams in the course. We identify one potential antecedent of women's relatively lower sense of belonging in physics, namely, negative cultural stereotypes about women's inferior ability in physics compared to men. We then discuss pedagogical strategies that might be employed to enhance women's sense of belonging in physics.

Stout, Jane G.; Ito, Tiffany A.; Finkelstein, Noah D.; Pollock, Steven J.

2013-01-01

47

How a gender gap in belonging contributes to the gender gap in physics participation  

NSDL National Science Digital Library

A great deal of research indicates that feeling a secure sense of belonging in academic settings is critical to studentsâ achievement. In the current work, we present data collected over multiple semesters of a calculus-based introductory physics class indicating that women feel a lower sense of belonging than men in physics. This finding is important because our data also indicate that having a strong sense of belonging in physics positively predicts the degree to which all students see the value of physics in their daily life (an outcome that predicts motivation and persistence in achievement settings) as well as performance on exams in the course. We identify one potential antecedent of womenâs relatively lower sense of belonging in physics, namely, negative cultural stereotypes about womenâs inferior ability in physics compared to men. We then discuss pedagogical strategies that might be employed to enhance womenâs sense of belonging in physics.

Stout, Jane; Ito, Tiffany A.; Finkelstein, Noah D.; Pollock, Steven J.

2013-07-13

48

Barrier-Free Design: Access to and Use of Buildings by Physically Disabled People = Amenagement pour Acces Facile: Acces Facile aux Immeubles et Leur Utilisation par les Personnes Handicapees.  

ERIC Educational Resources Information Center

The manual describes, for people with physical disabilities, a building standard of accessibility and the policy for its application. Policies address both new construction and renovation work based on principles of building accessibility to a broad range of users, public service accessibility, and equality of access to employment opportunities.…

Public Works Canada, Ottawa (Ontario).

49

DMILL, une technologie mixte analogique numerique durcie adaptee aux besoins de la physique des hautes energies. (DMILL, a mixed analog-digital rad-hard technology especially designed for high-energy physics).  

National Technical Information Service (NTIS)

Future High Energy Physics experiments will require a fast, low noise, very rad-hard, mixed analog-digital micro-electronics VLSI technology. A consortium between CEA, Thomson-TCS and IN2P3, has been created in 1992 to develop and industrialize DMILL, esp...

M. Dentan M. C. Habrard R. Truche O. Flament

1994-01-01

50

Contribution of Physical Development and Muscular Strength to the Motor Performance Capacity of 7 to 12 Year Old Boys  

PubMed Central

The contribution of selected physical development and muscular strength measures to general motor performance capacity was investigated in 55 seven to twelve year old boys. The physical development variables were height, body weight and fat-free body. Right and left hand strength, and static leg extension force of the right, left and both legs. simultaneously were used as measures of strength. The measures of general motor capacity were six field performance tests of the kind typically used by investigators and teachers including the softball throw, vertical jump, standing broad jump, shuttle run, 50 yard dash, and mile run. Data were analyzed by the method of least squares and constants fitted for height, body weight, fat-free weight and various measures of strength with chronological age held constant. Strength accounted for 18 to 43 percent of the variation in the children's motor performance score. Two measures of physical development, body weight and fat-free body weight together with age, were the dominant factors, contributing from 46 to 65 percent of the variation. Muscular strength and physical development measures together accounted for 57 to 70 percent of the variability in motor performance. For diagnostic and research purposes, measurement of physical development is an important consideration for proper interpretation of field tests of motor performance. ImagesFigure 1

Teeple, Janet B.; Lohman, T. G.; Misner, J. E.; Boileau, R. A.; Massey, B. H.

1975-01-01

51

Maladies reli?es aux loisirs aquatiques  

PubMed Central

Résumé Objectif Passer en revue les facteurs de risque, la prise en charge et la prévention des maladies reliées aux loisirs aquatiques en pratique familiale. Sources des données Des articles originaux et de synthèse entre janvier 1998 et février 2012 ont été identifiés à l’aide de PubMed et des expressions de recherche en anglais water-related illness, recreational water illness et swimmer illness. Message principal Il y a un risque de 3 % à 8 % de maladies gastrointestinales (MGI) après la baignade. Les groupes à risque élevé de MGI sont les enfants de moins de 5 ans, surtout s’ils n’ont pas été vaccinés contre le rotavirus, les personnes âgées et les patients immunodéficients. Les enfants sont à plus grand risque parce qu’ils avalent plus d’eau quand ils nagent, restent dans l’eau plus longtemps et jouent dans l’eau peu profonde et le sable qui sont plus contaminés. Les adeptes des sports dans lesquels le contact avec l’eau est abondant comme le triathlon et le surf cerf-volant sont aussi à risque élevé et même ceux qui s’adonnent à des activités impliquant un contact partiel avec l’eau comme la navigation de plaisance et la pêche ont un risque de 40 % à 50 % fois plus grand de MGI par rapport à ceux qui ne pratiquent pas de sports aquatiques. Il y a lieu de faire une culture des selles quand on soupçonne une maladie reliée aux loisirs aquatiques et l’échelle clinique de la déshydratation est utile pour l’évaluation des besoins de traitement chez les enfants affectés. Conclusion Les maladies reliées aux loisirs aquatiques est la principale cause de MGI durant la saison des baignades. La reconnaissance que la baignade est une source importante de maladies peut aider à prévenir les cas récurrents et secondaires. On recommande fortement le vaccin contre le rotavirus chez les enfants qui se baignent souvent.

Sanborn, Margaret; Takaro, Tim

2013-01-01

52

Tilt and strain deformation induced by hydrologically active natural fractures: application to the tiltmeters installed in Sainte-Croix-aux-Mines observatory (France)  

NASA Astrophysics Data System (ADS)

We investigate the deformation induced by water pressure variations in hydrologically active natural fractures, and recorded by tiltmeters and strainmeters. The deformation associated with a single fracture is derived using finite-element modelling (FEM). A range in fracture geometries is explored, first to highlight the sensitivity of each geometrical parameter to the deformation, and secondly to allow transfer to observation sites. Water level variations in the fracture are then derived from a hydrological model, driven by observed rainfall, and calibrated on fracture water flow measurements. The modelling results are explicitly applied to constrain the local hydrological contribution to observations with the 100-m-long hydrostatic tiltmeter installed at Sainte-Croix-aux-Mines (France). Our study shows that well-founded physical modelling of local hydrological effect allows a substantial correction of records in observatories.

Longuevergne, Laurent; Florsch, Nicolas; Boudin, Frédéric; Oudin, Ludovic; Camerlynck, Christian

2009-08-01

53

Les disparités de recours aux soins en 1991  

Microsoft Academic Search

[fre] Les disparités de recours aux soins en 1991 . En termes quantitatifs, les disparités sociales de recours aux médecins sont limitées. En revanche, les écarts de comportements liés à la catégorie de praticiens auxquels s'adressent les patients sont plus importants : un quart des séances de soins des ouvriers et des paysans ont lieu chez un spécialiste alors que

Pierre Mormiche

1993-01-01

54

BJSM social media contributes to health policy rethink: a physical activity success story in Hertfordshire.  

PubMed

Strategies to modernise the National Health Service (NHS) in England have brought about the development of local organisations called Health and Wellbeing (H&WB) boards through the Health and Social Care Act 2012. These boards were intended to become a forum where key leaders and stakeholders from health and care systems work together to improve the health and well-being of their local population and reduce health inequalities. Throughout England these boards have been drafting their strategies, largely ignoring the importance of physical activity in health and well-being. In the county of Hertfordshire, the initial draft priorities were released in 2012 and physical activity promotion was not included. Using a BJSM blog, BJSM online poll, Twitter and email, an attempt was made to generate as much interest and formal feedback as possible to the draft strategy, in order to ensure the inclusion of physical activity as a priority in the revised strategy. PMID:23444393

Weiler, Richard; Neyndorff, Christine

2013-02-26

55

New physics contribution to B{yields}K{pi} decays in soft collinear effective theory  

SciTech Connect

We analyze the 5{sigma} difference between the CP asymmetries of the B{sup 0{yields}}K{sup +{pi}-} and B{sup +{yields}}K{sup +{pi}0} decays within the soft collinear effective theory. We find that in the standard model, such a big difference cannot be achieved. We classify then the requirements for the possible New Physics models, which can be responsible for the experimental results. As an example of a New Physics model we study minimal supersymmetric models, and find that the measured asymmetry can be obtained with nonminimal flavor violation.

Huitu, K. [Department of Physics, and Helsinki Institute of Physics, P.O.Box 64, FIN-00014, University of Helsinki (Finland); Khalil, S. [Centre for Theoretical Physics, British University in Egypt, El Sherouk City, 11837 (Egypt) and Department of Mathematics, Ain Shams University, Faculty of Science, Cairo, 11566 (Egypt)

2010-05-01

56

Induced acceleration contributions to locomotion dynamics are not physically well defined  

Microsoft Academic Search

Induced acceleration analysis quantifies the contributions of individual moments and forces to the accelerations, reaction forces, and powers produced during a task. The analysis has been advocated in the assessment of muscle and joint moment function during locomotion. However, results and interpretations drawn from the analysis have differed considerably between studies. The purpose of this paper is to assess whether

George Chena

57

Modular Theory and Eyvind Wichmann's Contributions to modern Particle Physics Theory  

Microsoft Academic Search

Some of the consequences of Eyvind Wichmann's contributions to modular theory and the QFT phase-space structure are presented. In order to show the power of those ideas in contemporary problems, I selected the issue of algebraic holography as well as a new nonperturbative constructive approach (based on the modular structur of wedge-localized algebras and modular inclusions) and show that these

Bert Schroer; Xavier Sigaud

1999-01-01

58

Physical Activity Patterns in Portuguese Adolescents: The Contribution of Extracurricular Sports  

ERIC Educational Resources Information Center

In Portugal, two sports systems exist, one through schools and the other in community clubs. The purpose was to determine the impact of extra-curricular sports (EC sports) on boys' and girls' moderate to vigorous physical activity (MVPA). 208 adolescents (79 boys and 129 girls), between 12 and 18 years old, wore an accelerometer over seven days.…

Silva, Pedro; Sousa, Michael; Aires, Luisa; Seabra, Andre; Ribeiro, Jose; Welk, Gregory; Mota, Jorge

2010-01-01

59

Physical Activity Patterns in Portuguese Adolescents: The Contribution of Extracurricular Sports  

ERIC Educational Resources Information Center

|In Portugal, two sports systems exist, one through schools and the other in community clubs. The purpose was to determine the impact of extra-curricular sports (EC sports) on boys' and girls' moderate to vigorous physical activity (MVPA). 208 adolescents (79 boys and 129 girls), between 12 and 18 years old, wore an accelerometer over seven days.…

Silva, Pedro; Sousa, Michael; Aires, Luisa; Seabra, Andre; Ribeiro, Jose; Welk, Gregory; Mota, Jorge

2010-01-01

60

Contribution of Physical Education and Sport to Health-Related Fitness in High School Students  

ERIC Educational Resources Information Center

|This study compared health-related fitness variables of high school students (14 to 19-years-old; 120 males, 67 females) participating in physical education (PE) and school-sponsored sports (SSS) to students participating solely in PE. Cardiovascular fitness, the primary variable of interest, was measured using the 20-Meter Shuttle Ran (number of…

Beets, Michael W.; Pitetti, Kenneth H.

2005-01-01

61

Teaching the Nature of Science in Physics Courses: The Contribution of Classroom Historical Inquiries  

ERIC Educational Resources Information Center

|Physics and chemistry programs at the secondary school level in France recommend introducing components of the history of science (HS). Emphasis is placed on a "cultural" dimension, which is poorly defined but essentially refers to elements of epistemological nature. Moreover, the few examples of activities based on HS suggested by the programs…

Maurines, Laurence; Beaufils, Daniel

2013-01-01

62

Geophysics contributed to the radical change from classical to modern physics 100 years ago  

Microsoft Academic Search

Several major developments in the 1890s resulted in radical changes in physics. These developments included the discovery of X rays and of uranium radiation, or Becquerel rays, and the confirmation of electricity's substantial character---an idea considered by most physicists at that time as obsolete and without foundation. The first measurements of e\\/m (negative elementary charge divided by mass of the

W. Schröder; K. H. Wiederkehr

1998-01-01

63

Exploratory integration of peanut genetic and physical maps and possible contributions from Arabidopsis  

Microsoft Academic Search

Arachis hypogaea is a widely cultivated crop both as an oilseed and protein source. The genomic analysis of Arachis species hitherto has been limited to the construction of genetic maps; the most comprehensive one contains 370 loci over 2,210 cM in length. However, no attempt has been made to analyze the physical structure of the peanut genome. To investigate the practicality

B. Yüksel; J. E. Bowers; J. Estill; L. Goff; C. Lemke; A. H. Paterson

2005-01-01

64

How socio-economic status contributes to participation in leisure-time physical activity  

Microsoft Academic Search

The aim of this cross-sectional study was to identify individual, social, and environmental contributors (mediators) to individual- and area-level differences in leisure-time physical activity across socio-economic groups. A two-stage stratified sampling design was used to recruit 20–65 year old adults (N=2194) living in 154 census collection districts of Adelaide, Australia (overall response rate: 12%). Participants completed two surveys six months

Ester Cerin; Eva Leslie

2008-01-01

65

Decomposing the effects of ocean warming on chlorophyll a concentrations into physically and biologically driven contributions  

NASA Astrophysics Data System (ADS)

Recently compiled observational data suggest a substantial decline in the global median chlorophyll a concentration over the 20th century, a trend that appears to be linked to ocean warming. Several modelling studies have considered changes in the ocean’s physical structure as a possible cause, while experimental work supports a biological mechanism, namely an observed increase in zooplankton grazing rate that outpaces phytoplankton production at higher temperatures. Here, we present transient simulations derived from a coupled ocean general circulation and carbon cycle model forced by atmospheric fields under unabated anthropogenic global warming (IPCC SRES A1FI scenario). The simulations account for both physical and biological mechanisms, and can reproduce about one quarter of the observed chlorophyll a decline during the 20th century, when using realistically parameterized temperature sensitivity of zooplankton metabolism (Q10 between 2 and 4) and phytoplankton growth (Q10 ˜ 1.9). Therefore, we have employed and re-calibrated the standard ecosystem model which assumes a lower temperature sensitivity of zooplankton grazing (Q10 = 1.1049) by re-scaling phytoplankton growth rates and zooplankton grazing rates. Our model projects a global chlorophyll a decline of >50% by the end of the 21st century. While phytoplankton abundance and chlorophyll a experience pronounced negative effects, primary production and zooplankton concentrations are less sensitive to ocean warming. Although changes in physical structure play an important role, much of the simulated change in chlorophyll a and productivity is related to the uneven temperature sensitivity of the marine ecosystem.

Olonscheck, D.; Hofmann, M.; Worm, B.; Schellnhuber, H. J.

2013-03-01

66

Independent and Mediated Contributions of Personality, Coping, Social Support, and Depressive Symptoms to Physical Functioning Outcome Among Patients in Cardiac Rehabilitation  

Microsoft Academic Search

This study examined the direct and mediated contributions of psychosocial variables to posttreatment physical functioning among 142 patients receiving cardiac rehabilitation. Two models were proposed and tested. In the first model, psychosocial factors were correlated and made to predict baseline and 6-week physical functioning. The results showed that after controlling for age, illness severity, baseline physical functioning, and other psychosocial

Biing-Jiun Shen; Charles P. McCreary; Hector F. Myers

2004-01-01

67

Gender and the development of oppositional defiant disorder: contributions of physical abuse and early family environment.  

PubMed

Research is needed to understand the role of gender in the stability, course and etiology of antisocial behavior. Family environment, given its proximal association with children's behavior, holds great promise in understanding risk for antisocial behavior. The present study examined the role of parental acceptance and emotional responsivity as assessed using the HOME, caregiver report of intimate partner violence (IPV), and levels of physical abuse as assessed using the Conflict Tactics Scales, on subsequent symptoms of Oppositional Defiant Disorder (ODD), a childhood disorder characterized by antisocial behavior. Data were drawn from Waves 1-3, cohorts 3 and 6 of the Project for Human Development in Chicago Neighborhoods. Results suggest only minor gender differences in levels of ODD symptoms, with equal rates of stability from Wave 2 to 3 in symptom levels. For boys and girls, IPV was associated with an increased risk of ODD symptoms, and higher acceptance was associated with reduced risk of ODD symptoms. However, gender differences emerged in the impact of physical abuse and emotional responsiveness, in that the former was a significant predictor for girls only, and the latter was significant for boys only. Potential implications for these findings, including the role of gender socialization are discussed. PMID:23420295

Burnette, Mandi L

2013-02-17

68

Contributions of local knowledge to the physical limnology of Lake Como, Italy.  

PubMed

This article shows how local knowledge may be valuably integrated into a scientific approach in the study of large and complex hydrological systems where data collection at high resolution is a challenge. This claim is supported through a study of the hydrodynamics of a large lake where qualitative data collected from professional fishers was combined with theory to develop a hypothesis that was then verified by numerical modeling. First the fishermen's narratives were found to describe with accuracy internal wave motions that were evident in water column temperature records, which revealed their practical knowledge of the lake's hydrodynamics. Second, local knowledge accounts emphasized the recurrent formation of mesoscale gyres and return flows in certain zones of the lake in stratified conditions, which did not appear in the physical data because of limitations of sampling resolution. We hypothesized that these features developed predominantly because of the interaction of wind-driven internal motions with the lake's bathymetry, and the Earth's rotation in the widest areas of the basin. Numerical simulation results corroborated the fishers' descriptions of the flow paths and supported the hypothesis about their formation. We conclude that the collaboration between scientific and local knowledge groups, although an unusual approach for a physical discipline of the geosciences, is worth exploring in the pursuit of a more comprehensive understanding of complex geophysical systems such as large lakes. PMID:22493231

Laborde, Sarah; Imberger, Jörg; Toussaint, Sandy

2012-04-09

69

Elongated cell morphology and uniaxial mechanical stretch contribute to physical attributes of niche environment for MSC tenogenic differentiation.  

PubMed

Specific lineage differentiation of mesenchymal stem cells (MSCs), such as osteogenic and chondrogenic differentiation, is the major subject of MSC-based musculoskeletal tissue regeneration. Nevertheless, an ideal induction regime for MSC tenogenic differentiation is less explored. While induced differentiation of MSCs using chemical signalling, such as growth factors, has been the mainstream methodology in the past decades, recent studies show that a physical signal is one of the major attributes that composes in vivo niches of MSCs, and is a potent factor in determining MSC fate in several in vitro models; for example, control of cell shape with surface topography can drive MSCs towards a specific lineage differentiation. Mechanical signals also play important roles in the differentiation of MSCs towards certain lineages. Tendon is a connective tissue which is subjected to dynamic uniaxial mechanical stretch by physical activity. Additionally, tenocytes have a unique elongated cell morphology and are aligned in parallel with collagen fibres. We thus would hypothesize that both enforced elongated cell morphology and uniaxial mechanical stretch signal contribute to the major physical niche attributes of tenocytes' in vivo microenvironment, and mimicking these physical signals may be sufficient to induce tenogenic differentiation of MSCs. PMID:23505099

Wang, Wenbo; Deng, Dan; Li, Jie; Liu, Wei

2013-04-11

70

Mathematical Oncology: How Are the Mathematical and Physical Sciences Contributing to the War on Breast Cancer?  

PubMed Central

Mathematical modeling has recently been added as a tool in the fight against cancer. The field of mathematical oncology has received great attention and increased enormously, but over-optimistic estimations about its ability have created unrealistic expectations. We present a critical appraisal of the current state of mathematical models of cancer. Although the field is still expanding and useful clinical applications may occur in the future, managing over-expectation requires the proposal of alternative directions for mathematical modeling. Here, we propose two main avenues for this modeling: 1) the identification of the elementary biophysical laws of cancer development, and 2) the development of a multiscale mathematical theory as the framework for models predictive of tumor growth. Finally, we suggest how these new directions could contribute to addressing the current challenges of understanding breast cancer growth and metastasis.

Chauviere, Arnaud H.; Hatzikirou, Haralampos; Lowengrub, John S.; Frieboes, Hermann B.; Thompson, Alastair M.

2010-01-01

71

Neuroimaging Techniques: a Conceptual Overview of Physical Principles, Contribution and History  

SciTech Connect

This paper is meant to provide a brief overview of the techniques currently used to image the brain and to study non-invasively its anatomy and function. After a historical summary in the first section, general aspects are outlined in the second section. The subsequent six sections survey, in order, computed tomography (CT), morphological magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), diffusion-tensor magnetic resonance imaging (DWI/DTI), positron emission tomography (PET), and electro- and magneto-encephalography (EEG/MEG) based imaging. Underlying physical principles, modelling and data processing approaches, as well as clinical and research relevance are briefly outlined for each technique. Given the breadth of the scope, there has been no attempt to be comprehensive. The ninth and final section outlines some aspects of active research in neuroimaging.

Minati, Ludovico [Scientific Direction, Istituto Nazionale Neurologico Carlo Besta, via Celoria 11, 20133, Milan (Italy)

2006-06-08

72

Neuroimaging Techniques: a Conceptual Overview of Physical Principles, Contribution and History  

NASA Astrophysics Data System (ADS)

This paper is meant to provide a brief overview of the techniques currently used to image the brain and to study non-invasively its anatomy and function. After a historical summary in the first section, general aspects are outlined in the second section. The subsequent six sections survey, in order, computed tomography (CT), morphological magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), diffusion-tensor magnetic resonance imaging (DWI/DTI), positron emission tomography (PET), and electro- and magneto-encephalography (EEG/MEG) based imaging. Underlying physical principles, modelling and data processing approaches, as well as clinical and research relevance are briefly outlined for each technique. Given the breadth of the scope, there has been no attempt to be comprehensive. The ninth and final section outlines some aspects of active research in neuroimaging.

Minati, Ludovico

2006-06-01

73

The relative contributions of physical and microbiological factors to cohesive sediment stability  

NASA Astrophysics Data System (ADS)

The stabilising effects of natural benthic diatom and bacterial assemblages on cohesive sediments were compared with those caused by physico-chemical binding alone. Cohesive sediment beds were reconstructed in 4 annular laboratory miniflumes, using sediment collected at 5 6 m water depth from a local fjord. The sediment was left to stabilise (consolidate) for 1, 2, 5 and 10 days, before being fully resuspended in a series of erosion experiments. The flumes were aerated and subjected to different light/dark conditions; antibiotics were used to isolate diatom from bacteria effects. During consolidation, a constant current velocity was maintained, at a speed well below erosion threshold. ‘Natural’ sediment regained 27% of its original stability after 1 day, and 85% after 5 days. Complete ‘natural’ sediment stability was regained within 10 days. Benthic diatoms (mainly Nitzchia sp., Gyrosigma sp. and Pennales sp.) were responsible for about 80% of the biostabilisation, whilst bacteria contributed ˜12%, indicating the importance of light as a controlling factor for surface sediment stability. Relative to physico-chemical binding, the increase in erosion threshold induced by benthic diatoms was 120%, and by bacteria 20%. Where the assemblage consisted of both diatoms and bacteria, the increase was 150%, indicating that natural bed values are not a simple summation of the two effects, i.e. diatoms plus bacteria. Using the results, a first generation empirical relationship describing the relative contributions of microbenthic and physico-chemical factors in the development of erosion threshold is presented. Empirical relationships containing biostabilisation coefficients are important for better computer model predictions of sediment transport.

Lundkvist, M.; Grue, M.; Friend, P. L.; Flindt, M. R.

2007-05-01

74

Moderate physical activity from childhood contributes to metabolic health and reduces hepatic fat accumulation in adult rats  

PubMed Central

Background Obesity, oxidative stress and inflammation, by triggering insulin resistance, may contribute to the accumulation of hepatic fat, and this accumulation by lipotoxicity can lead the organ to fail. Because obesity is growing at an alarming rate and, worryingly, in a precocious way, the present study aimed to investigate the effects of moderate physical training performed from childhood to adulthood on liver fat metabolism in rats. Methods Twenty rats that were 28?days old were divided into two groups: control (C) and trained (T). The C Group was kept in cages without exercise, and the T group was submitted to swimming exercise for 1?hour/day, 5?days/week from 28 to 90?days of age (8?weeks) at 80% of the anaerobic threshold determined by the lactate minimum test. At the end of the experiment, the body weight gain, insulin sensitivity (glucose disappearance rate during the insulin tolerance test), concentrations of free fatty acids (FFA) and triglycerides (TG) and hepatic lipogenic rate were analyzed. For the statistical analysis, the Student t-test was used with the level of significance preset at 5%. Results The T group showed lower body weight gain, FFA concentrations, fat accumulation, hepatic lipogenic rate and insulin resistance. Conclusion The regular practice of moderate physical exercise from childhood can contribute to the reduction of obesity and insulin resistance and help prevent the development of accumulation of hepatic fat in adulthood.

2013-01-01

75

Release of cadmium in the Danube estuary: contribution of physical and chemical processes as determined by an experimental approach.  

PubMed

The behavior of dissolved cadmium (Cd) in the Danube estuary was investigated through field sampling and mixing experiments using Danube River water and Black Sea water. The experiments were performed by mixing these two end-member waters in various proportions, with the addition of stable or radioactive Cd to the freshwater Danube end-member prior to the mixing. The release of Cd that resulted in maximum concentrations under field conditions was well simulated by mixing experiments. The experimental results were modeled assuming that the release of Cd was the sum of the contribution of physical effects resulting from dilution effects and the contribution of chemical effects resulting from dissolved Cd-complex formation (and isotopic exchange when concerned). In the absence of dissolved Cd-complexing ligands, the release of Cd due to the dilution of the particulate phase during mixing could explain part of the maximum concentrations observed in field conditions. Kinetic effects were established by comparing the theoretical and measured contribution of chemical effects resulting from dissolved Cd-complex formation. The non-equilibrium state observed during the mixing experiment suggested the presence of particulate labile Cd that was not easily mobilized. All these features supported the hypothesis that Cd released in estuaries is controlled both by the dilution of the particulate phase and by kinetic competitive complexation between particulate ligands (covering a large spectrum of nature and strength) and dissolved ligands. PMID:12469773

Garnier, Jean-Marie; Guieu, Cécile

2003-02-01

76

Extracellular signal-regulated kinase 5 in the cerebrospinal fluid-contacting nucleus contributes to morphine physical dependence in rats.  

PubMed

The cerebrospinal fluid-contacting nucleus (CSF-CN) may influence actual composition of the CSF for non-synaptic signal transmission via releasing or absorbing bioactive substances, which distributes and localizes in the ventral periaqueductal central gray of the brainstem. Previous studies demonstrated that CSF-CN was involved in neuropathic pain and morphine dependence. Thus, to identify whether extracellular signal-regulated kinase 5 (ERK5) distributed in the CSF-CN and its function on the formation and development of morphine physical dependence, morphine withdrawal-like behavioral test and immunofluorescent technique were used in this research. Morphine was subcutaneously injected by an intermittent and escalating procedure to induce physical dependence, which was measured by withdrawal symptoms. In this study, we found that horseradish peroxidase-conjugated toxin subunit B/p-ERK5 double-labeled neurons expressed in the CSF-CN of normal rats. ERK5 signaling pathway was remarkably activated by naloxone-precipitated withdrawal in the CSF-CN. Moreover, selective attenuation of p-ERK5 expression in the CSF-CN by lateral ventricle injection of BIX02188 could significantly relieve morphine withdrawal symptom. These findings confirmed that the activation of p-ERK5 in the CSF-CN might contribute to morphine physical dependence. PMID:23143893

Wang, Chun-Guang; Ding, Yan-Ling; Zheng, Tian-Fang; Wei, Jing-Qiu; Liu, He; Chen, Yu-Feng; Wang, Jia-You; Zhang, Li-Cai

2012-11-11

77

Potential Contribution of Digital Video to the Analysis of the Learning Process in Physics: A Case Study in the Context of Electric Circuits  

ERIC Educational Resources Information Center

|We seek to demonstrate how digital video technology can contribute towards our understanding of the process of development of conceptual understanding in physics. We use digital video to analyze 4 brief Physics by Inquiry sessions with 2 groups of preservice teachers. The instances include independent group work and instructor-student…

Constantinou, Constantinos P.; Papadouris, Nicos

2004-01-01

78

Identification of junk buyers' contribution to recycling of household waste in Hanoi, Vietnam, through a physical composition analysis.  

PubMed

Even in developing countries, the amount of containers and packaging waste are increasing in line with population concentration and lifestyle changes in urban areas. This can cause serious problems for the disposal of municipal solid waste. Through a physical composition analysis of household waste in Hanoi, the capital of Vietnam, this study aimed to identify the contribution made by junk buyers to recycling. Interviews on the handling of recyclable waste by households were conducted. About 232 kg of recyclable waste was sampled from a total of 115 households, and about 230 kg of municipal solid waste was sampled from a total of 101 households and sorted into 69 categories for measurement by volume and weight. The interview survey revealed that a high proportion of households tended to routinely store recyclable waste for sale or donation to junk buyers. Junk buyers accounted for 8.8% of recycling by weight or 26.0% by volume according to the results of the physical composition analysis. In addition, the results suggested that containers and packaging waste accounted for the largest proportion of household waste by volume. Junk buyers recycled 25.5% by weight of containers and packaging waste. In the formulation of new plans for municipal solid waste management to improve the current situation and handle future challenges, the role of the informal sector should be monitored carefully and reliable data on recyclable waste should be collected continuously. PMID:22584265

Kawai, Kosuke; Osako, Masahiro; Matsui, Saburo; Dong, Nguyen The

2012-05-13

79

Geographic variation in participation for physically disabled adults: The contribution of area economic factors to employment after spinal cord injury  

PubMed Central

This study investigates that role of area economic characteristics in predicting employment, a key aspect of social participation for adults with physical disabilities, using data from a national registry of persons with spinal cord injury (SCI). SCI results in chronic impairment and most commonly occurs during young adulthood when working is a key aspect of the adult social role. Geocoded data was collected from two of the 14 SCI Model Systems (SCIMS) centers involved in the National SCIMS database and used to link individual-level data with area-level measures extracted from the 2000 US Census. The analysis included participants of working age (18–64 years) and living in the community (N=1,013). Hierarchical generalized linear modeling was used to estimate area-level variation in participation and the relative contribution of area-level economic indicators, adjusted for individual-level health, functioning, and background characteristics. The likelihood of employment for adults with SCI varied by area and was associated with area SES and ubanicity, but not area unemployment. These findings suggest that variation in area economic conditions may affect the feasibility of employment for persons who experience chronic physical disability during adulthood, thus limiting full participation in society.

Botticello, Amanda L.; Chen, Yuying; Tulsky, David S.

2012-01-01

80

Des orphelins de la JAC aux enfants perdus des parcours individuels  

Microsoft Academic Search

[fre] En France, en 1966, la politique de la formation professionnelle a été organisée en fonction d'un public bien précis : les jeunes exploitants familiaux. Elle a été ensuite étendue aux femmes, aux salariés, aux jeunes chômeurs. A l'heure actuelle, la décentralisation des décisions pose des problèmes de cohérence au niveau national et de priorité en fonction de la CEE.

Jean-François Chosson

1987-01-01

81

Lean soft tissue contributes more to bone health than fat mass independent of physical activity in women across the lifespan.  

PubMed

OBJECTIVES: To investigate the association between lean soft tissue (LST) and fat mass (FM) on bone health variables in women across the lifespan, while taking into account the influence of objectively measured habitual physical activity (PA). STUDY DESIGN: A total of 104 women, 37 young (23.3±2.6 years), 28 middle-age (49.2±5.4 years), and 39 old (68.3±6.4 years) participated in this cross-sectional study. All underwent a DXA scan and wore a pedometer for 7 days. MAIN OUTCOME MEASURES: Bone mineral content (BMC) and BMD of the whole body (WB), lumbar spine (LS) and proximal femur (PF), and body composition (FM and LST) were assessed with DXA and PA (steps/day) was assessed from 7 day pedometer counts. RESULTS: LST was significantly and positively associated with PF and LS BMD (r=0.34; 0.67, p<0.05), and WB, PF and LS BMC (r range=0.41-0.59, p<0.05) in all age groups and WB BMD in the middle-age group (r=0.72, p<0.05) independent of PA, FM, and hormonal status. FM was not positively associated with any bone variable in any age group when adjusted for PA, LST, and hormonal status. PA was significantly associated with WB BMD in the middle-age group (r=0.60, p<0.05), independent of LST, FM, and hormonal status. CONCLUSIONS: LST contributes more to bone health in women across the lifespan than FM, independent of PA and hormonal status. PMID:23313436

Hinriksdóttir, Gunnhildur; Arngrímsson, Sigurbjörn Á; Misic, Mark M; Evans, Ellen M

2013-01-01

82

Contribution of free play towards physical activity guidelines for New Zealand primary school children aged 7–9 years  

Microsoft Academic Search

ObjectiveThe objectives of this study were to investigate children's physical activity patterns to gain comparisons between home and school and to determine whether the current physical activity guidelines of 60 min of moderate to vigorous physical activity (MVPA) daily were being met.MethodsParticipants were recruited from two New Zealand primary schools (60 children, mean age (SD) 8.3 (0.7) years). Physical activity

S. E. McGall; M. R. McGuigan; C. Nottle

2011-01-01

83

The Contribution of Physical Activity and Media Use during Childhood and Adolescence to Adult Women's Body Image  

Microsoft Academic Search

This study aimed to investigate the effects of both past and current physical activity and media use on women's body image. A sample of 144 female undergraduate students completed measures of current physical activity, media use and body image, as well as providing retrospective reports of their physical activity participation and media usage during childhood and adolescence. Regression analyses showed

Amy Slater; Marika Tiggemann

2006-01-01

84

Long-Term Effects of Witnessing Marital Violence for Women: The Contribution of Childhood Physical and Sexual Abuse  

Microsoft Academic Search

A sample of 313 college women completed a questionnaire about experiences with violence in childhood and adulthood and adult adjustment and relationship functioning. Nine percent of the women reported having witnessed some type of physical conflict between their parents. Witnessing marital violence was associated with other family mental health risks, childhood physical and sexual abuse, and adult physical assaults by

Margaret M. Feerick; Jeffrey J. Haugaard

1999-01-01

85

Expression and regulation of the early auxin-responsive Aux\\/IAA genes during strawberry fruit development  

Microsoft Academic Search

The plant hormone auxin transcriptionally activates Aux\\/IAA genes. Auxin plays an important role in regulating fruit growth and ripening of strawberry and Aux\\/IAA genes have been extensively studied in Arabidopsis, rice and tomato, but little information is available on strawberry fruit. In the present work, two full-length of early\\u000a auxin-responsive Aux\\/IAA genes, termed FaAux\\/IAA1 and FaAux\\/IAA2 respectively, were isolated and

Du-juan LiuJian-ye; Jian-ye Chen; Wang-jin Lu

2011-01-01

86

Protein-Protein Interactions among the Aux\\/IAA Proteins  

Microsoft Academic Search

The plant hormone indoleacetic acid (IAA) transcriptionally activates early genes in plants. The Aux\\/IAA family of early genes encodes proteins that are short-lived and nuclear-localized. They also contain a putative prokaryotic beta alpha alpha DNA binding motif whose formation requires protein dimerization. Here, we show that the pea PS-IAA4 and Arabidopsis IAA1 and IAA2 proteins perform homo- and heterotypic interactions

Jungmook Kim; Klaus Harter; Athanasios Theologis

1997-01-01

87

Identifying the contribution of physical and chemical stressors to the daily number of hospital admissions implementing an artificial neural network model  

Microsoft Academic Search

The relative contribution of chemical (air pollution) and physical (temperature and humidity) health stressors to urban hospitalization\\u000a rates is the objective of the current study. The data used in the study included the daily number of hospital admissions due\\u000a to cardiorespiratory diseases, hourly mean concentrations of CO, NO2, SO2, O3, and black smoke in several monitoring stations, as well as

Pavlos Kassomenos; Michael Petrakis; Dennis Sarigiannis; Alberto Gotti; Spyridon Karakitsios

88

Auxin regulates SCFTIR1-dependent degradation of AUX\\/IAA proteins  

Microsoft Academic Search

The plant hormone auxin is central in many aspects of plant development. Previous studies have implicated the ubiquitin-ligase SCFTIR1 and the AUX\\/IAA proteins in auxin response. Dominant mutations in several AUX\\/IAA genes confer pleiotropic auxin-related phenotypes, whereas recessive mutations affecting the function of SCFTIR1 decrease auxin response. Here we show that SCFTIR1 is required for AUX\\/IAA degradation. We demonstrate that

William M. Gray; Stefan Kepinski; Dean Rouse; Ottoline Leyser; Mark Estelle

2001-01-01

89

Évaluation de la performance péréquatrice des concours financiers de l'État aux communes  

Microsoft Academic Search

[fre] Évaluation de la performance péréquatrice des concours financiers de l’État aux communes . . Les 36 600 communes françaises sont loin de pouvoir offrir aux résidents ou aux entreprises qu’elles accueillent le même niveau de services collectifs de proximité pour un effort fiscal donné. Leurs «pouvoirs d’achat en termes de consommations collectives» varient dans des proportions considérables. D’une part,

Guy Gilbert; Alain Guengant

2004-01-01

90

What can global positioning systems tell us about the contribution of different types of urban greenspace to children's physical activity?  

PubMed Central

Urban greenspace is hypothesised to be an important location for physical activity in children, but their actual use of the resource to be active is not well known. In this study, global positioning systems (GPS) and accelerometers were used to measure activity within green environments for 902 English children aged 11-12. We summarised activity intensities in different types of greenspace on weekday evenings, weekend days, and by season. Parks were used for as much as 30% of outdoors moderate-vigorous activity at weekends and use was consistent across seasons. The findings suggest the importance of certain types of greenspace to children’s physical activity.

Lachowycz, Kate; Jones, Andrew P.; Page, Angie S.; Wheeler, Benedict W.; Cooper, Ashley R.

2013-01-01

91

Fertilization ecology of egg coats: physical versus chemical contributions to fertilization success of free-spawned eggs  

Microsoft Academic Search

Free-spawned eggs are typically enclosed within accessory structures that are shed early in development. Most research on the role of these structures in fertilization has focused on chemical constituents and their influence on sperm-egg interaction. Here I test an alternative hypothesis that accessory structures play an important physical role in fertilization by increasing the size and buoyancy of the egg,

Robert D. Podolsky

92

Contribution of thermal, rheological and physical measurements to the determination of sensorially perceived quality of ice cream containing bulk sweeteners  

Microsoft Academic Search

The role of rheological measurements, thermal analysis and physical properties such as overrun, instrumental hardness and melting behavior on sensorial profile mapping of vanilla ice cream was evaluated. Samples with different functional characteristics were prepared partially substituting sucrose by bulk sweeteners. Creaminess apart from thermal properties (glass transition temperature-Tg, ice crystal uniformity-??mcurve and unfrozen water content-UFW) was poorly related with

Christos Soukoulis; Evagellia Rontogianni; Constantina Tzia

2010-01-01

93

Des furoncles r?sistants aux antibiotiques: penser ? la myiase !!  

PubMed Central

Les myiases sont des infections parasitaires par des larves de mouches. La localisation cutanée doit être évoquée de retour d'un pays tropical devant une évolution inhabituelle de lésions cutanées. Nous rapportons une observation d'un militaire tunisien, ayant séjourné en République Démocratique du Congo. Il était atteint de myiase cutanée simulatrice d'une furonculose résistante aux antibiotiques. L'intérêt de cette observation est de souligner l'importance d’évoquer la myiase dont le traitement est simple et rapide chez un patient de retour de zone d'endémie.

Ajili, Faida; Abid, Rim; Bousseta, Najeh; Mrabet, Ali; Karoui, Ghazi; Louzir, Bassem; Battikh, Riadh; Othmani, Salah

2013-01-01

94

Accès aux services de santé parmi les immigrants au Canada  

Microsoft Academic Search

RésuméRésumé Il est important de répondre aux besoins en soins de santé des populations immigrantes du fait de leur nombre élevé, soit, présentement, environ 20 % de la population canadienne née à l’étranger, et dont on prévoit que les taux augmenteront avec le temps, si cette tendance persiste, ce qui rend la situation de plus en plus difficile. L’accessibilité des

Lydie A. Lebrun

2010-01-01

95

Psychological distress in African American grandmothers raising grandchildren: the contribution of child behavior problems, physical health, and family resources.  

PubMed

Diminished psychological health has been identified among caregiving grandmothers. The intent of this investigation was to examine psychological distress levels, as well as their predictors, in a sample of 480 caregiving African American grandmothers, mean age 56 years. Almost 40% (39.8%) of participants had clinically elevated psychological distress scores. Results of hierarchical multiple regression indicated that internalizing and externalizing child behavior problems, poor grandmother physical health, younger age of grandmother, and lack of family resources predicted 31% of the variance in psychological distress. Results provide direction for nursing interventions aimed at enhancing the psychological well-being of caregiving grandmothers. PMID:23606233

Kelley, Susan J; Whitley, Deborah M; Campos, Peter E

2013-04-19

96

Aux\\/IAA Proteins Repress Expression of Reporter Genes Containing Natural and Highly Active Synthetic Auxin Response Elements  

Microsoft Academic Search

A highly active synthetic auxin response element (AuxRE), referred to as DR5, was created by petforming site-directed mutations in a natural composite AuxRE found in the soybean GH3 promoter. DR5 consisted of tandem direct repeats of 11 bp that included the auxin-responsive TGTCTC element. The DR5 AuxRE showed greater auxin responsiveness than a natural composite AuxRE and the GH3 promoter

Tim Ulmasov; Jane Murfett; Gretchen Hagen; Tom J. Guilfoyle

1997-01-01

97

Chemical vs. Physical Contributions to Grainsize Distributions in Hillslope Soils along a Denudation Gradient in the Sierra Nevada, California  

NASA Astrophysics Data System (ADS)

An important part of understanding how soil forms consists of understanding grainsize evolution. How much of a soil's grainsize distribution comes from physical (i.e., fracturing or treethrow) and/or chemical (i.e., secondary mineral production) weathering remains poorly understood. In order to evaluate the effect and magnitude of physical and chemical weathering on soil-grainsize, we used a geochemical mass balance and grainsize approach on soils from the Feather River basin in the Sierra Nevada. Three hillslopes in the basin were chosen to reflect 3 different degrees of channel erosion at their bases-a hillslope with active channel incision (60% slope, below the knickpoint), a hillslope reflecting the transition between the relict and modern-day incising areas (50% slope, at the knickpoint), and a 30% hillslope in the relict landscape (an area that has not yet "felt" the 5Mya increase in erosion). Our results show that soil particle sizes increase with both hillslope slope gradient and soil-depth, following a soil grainsize increase (?m/cm) = 0.036e^{6×Slope} (R^2 = 0.9995). The Zr from the tonalite (100 ppm) up to the saprolite (100-250ppm) and into the soil (soil approx saprolite) along the 3 slopes indicate that the basin's soil geochemistry is set at depths below the soil-saprolite boundary. The mean grainsize of particles at the soil-saprolite boundary increases with slope from 78 to 181 to 275?m. Thus, in terms of elemental compositions, colluvial soils appear virtually identical to the underlying saprolite, and soil grainsize differentiation within the colluvium is mostly a physical process. However, colluvial soils do show significantly finer size distributions in the hillslopes with lower erosion rates (which also have saprolites with a greater degree of weathering loss). Therefore, the degree of chemical denudation in the saprolite appears to dictate the susceptibility of the materials to physical breakdown to finer particle sizes in the overlying colluvial soil. In addition, turnover times calculated from slope-based erosion rates for the basin (Riebe et al., 2000) indicate that once in the soil, particles breakdown at rates of 0.9, 10, and 27?m/kyr (in order of increasing slope) along the 3 hillslopes. The fact that the particles in the 3 hillslopes are breaking down at different rates means that the higher- sloped colluvium is fining faster, even though it has an overall coarser grainsize than soils on shallower slopes with higher degrees of chemical weathering. Considering the recent studies suggesting that channel incision rates are influenced by available grainsize of the sediments, these new findings suggest that processes occurring within the saprolite can possibly affect rates of bedrock channel incision. With our results showing that a soil's particle size is a product of weathering in the saprolite, we need models better linking effects and feedbacks between a hillslope's soil, it's saprolite, and the channel.

Weinman, B. A.; Yoo, K.; Mudd, S. M.; Attal, M.; Hurst, M. D.; Maher, K.; Kouba, C. M.; Bern, C.; Singhvi, A. K.

2011-12-01

98

Synoptic data for solar-terrestrial physics: The U.K. contribution to long-term monitoring  

NASA Astrophysics Data System (ADS)

In 1989 the Council of the Royal Society of London established a Study Group to investigate the current status and future requirements of solar-terrestrial monitoring in the United Kingdom. This paper summarizes the conclusions and recommendations of the U.K. Study Group. The rationale for regular synoptic monitoring of the solar terrestrial environment is reviewed briefly. Instruments used for solar-terrestrial monitoring in U.K.-supported research programs are listed, with special emphasis on research instruments that produce monitoring data. Some important applications of solar-terrestrial monitoring are outlined and criteria are presented for determining the priorities of various monitoring operations. High priority is attached to monitoring operations that are important for: (1) deriving geophysical models and reference systems; (2) calculating the principal solar-geophysical indices; (3) producing long time series of good data, especially at sites of particular geophysical interest; (4) detecting global changes; (5) contributing to real-time forecasts of solar-terrestrial conditions, or to longer-term predictions and planning; and (6) providing background data for other observations and experiments. The existing U.K. programs of solar-terrestrial monitoring make a highly prestigious contribution to national and international scientific activity. Synoptic measurements of the solar-terrestrial environment are crucial for underpinning present and future programs of basic, strategic and applied research. Therefore, a core program of synoptic monitoring must be maintained in the U.K. It is recommended that this core program should be financed centrally through the Research Councils and reviewed quinquennially.

Willis, D. M.; Hewish, A.; Rishbeth, H.; Rycroft, M. J.

1994-05-01

99

Verification of regional water balance modeling by physical and thermal measurements of groundwater contributions to a large lake  

NASA Astrophysics Data System (ADS)

Groundwater flow into Okanagan Lake is being estimated using modeling, physical and thermal methods for verification of a regional water budget. The semi-arid Okanagan Valley in the Interior of British Columbia, Canada is expected to experience increased future water stress due to climate change and population increases. Okanagan Lake is an approximately 100 km long by 4 km wide lake. The study area is a 19 km section of shoreline immediately adjacent to the city of Kelowna. This area has been previously modeled to be a large contributor of groundwater to the overall lake budget. Numerical modeling (MODFLOW), seepage meters, hydraulic gradient monitoring and heat as a tracer were used to estimate groundwater discharge at intervals of 200 to 500 m along the study area. An accurate estimate of groundwater discharge requires consideration of temporal variation in flows, spatial heterogeneity at sampling locations, and the impact of shoreline irregularities such as bays or points and variations in the nearshore lakebed profile on individual measurements. Long-term seepage meter and thermal method stations track annual changes. Seepage meter transects, parallel to the shoreline, describe the spatial heterogeneity of individual sampling locations. Cross sections of shallow drop-off versus steep drop-off shore measured discharge are modeled. Shoreline irregularities are modeled to evaluate potential impact on measurements. The physical and thermal methods are compared to evaluate their potential effectiveness at other locations. The groundwater discharge measurements will be utilized by other researchers conducting basin scale modeling as a constraint for calibration, and for later studies of urban contaminant loading to the lake.

Pyett, N.; Baptie, C.; Nichol, C. F.

2011-12-01

100

Application de la combustion catalytique aux turbines à gaz  

NASA Astrophysics Data System (ADS)

La réduction des émissions d'oxydes d'azote sur turbines à gaz est obtenue par diminution de la température au sein de la chambre de combustion. Les techniques possibles comprennent l'injection d'eau ou de vapeur, la combustion pauvre et l'oxydation catalytique. Parmi celles-ci, la dernière est la plus prometteuse en terme de coûts et de performances, avec des émissions de NOx ramenées à un seul chiffre (typiquement inférieures à 3 ppm). L'IFP travaille depuis maintenant 10 ans sur l'adaptation de la combustion catalytique aux turbines à gaz. Les études ont été conduites au travers de projets européen tels que AGATA (Advance Gas Turbine for Automotive Application) et ULECAT (Ultra Low CATalytic combustor for dual fuel gas turbine). Le premier projet était destiné au développement de véhicules hybrides et le second à la combustion stationnaire de biogaz et de combustible Diesel. Les études en cours dans ce domaine portent sur le développement d'une unité de cogénération intégrant une microturbine à combustion catalytique. Les travaux menés à l'IFP concernent la mise au point de catalyseurs répondant aux exigences de la combustion catalytique en turbine à gaz et le développement de chambres de combustion permettant la mise en oeuvre de ces catalyseurs.

Lebas, E.; Martin, G. H.

2002-04-01

101

Behavioral responses to orexin, orexin receptor gene expression, and spontaneous physical activity contribute to individual sensitivity to obesity  

PubMed Central

There is significant variability in diet-induced obesity (DIO) among humans and rodents, which has been associated with differences in intrinsic spontaneous physical activity (SPA). The orexin neuropeptides positively modulate SPA through multiple brain sites, but the effects of DIO on orexin's activity are not well understood. In this study, we tested the hypothesis that DIO sensitivity is mediated by decreased SPA and changes in the function of the orexins. As a DIO model, we used male Sprague-Dawley rats fed a high-fat (HF; 45% kcal from fat) or a low-fat (LF; 10% kcal from fat) diet for 10 wk. We measured SPA before and after HF or LF feeding and expression of orexin receptors by real-time PCR after dietary treatments. We tested DIO effects on orexin signaling by measuring SPA after injection of orexin A in the rostral lateral hypothalamus (RLH) before and after 10 wk of HF feeding. Finally, we tested whether daily orexin A RLH injections prevent DIO caused by HF feeding. Our results show that resistance to DIO is associated with an increase in SPA, SPA after injection of orexin A in RLH, and orexin receptor expression in sites that mediate orexin's effect on SPA, including RLH. We show that daily injections of orexin peptide in RLH prevent DIO without altering food intake. We estimate that the energetic cost of SPA after orexin A RLH injection accounts for approximately 61% of the extra caloric intake associated with HF intake, suggesting additional effects of orexins. In summary, our results suggest that variability in DIO sensitivity is mediated through adaptations in the activity of the orexin peptides and their receptors.

Boland, Kelsey; Teske, Jennifer A.; Billington, Charles; Kotz, Catherine M.

2012-01-01

102

Genome-wide analysis of Aux\\/IAA and ARF gene families in Populus trichocarpa  

Microsoft Academic Search

BACKGROUND: Auxin\\/Indole-3-Acetic Acid (Aux\\/IAA) and Auxin Response Factor (ARF) transcription factors are key regulators of auxin responses in plants. We identified the suites of genes in the two gene families in Populus and performed comparative genomic analysis with Arabidopsis and rice. RESULTS: A total of 35 Aux\\/IAA and 39 ARF genes were identified in the Populus genome. Comparative phylogenetic analysis

Udaya C Kalluri; Stephen P DiFazio; Amy M Brunner; Gerald A Tuskan

2007-01-01

103

Symetries et integrabilite des equations aux differences finies  

NASA Astrophysics Data System (ADS)

La présente thèse porte sur l'étude des symétries et des propriétés d'intégrabilité des équations aux différences finies. Dans le chapitre 1, le groupe de symétrie ponctuelle d'un système couplé à deux équations différentielles aux différences est étudié. On montre que dans certains cas, la dimension du groupe peut être infinie. Les équations peuvent décrire l'interaction de deux longues chaînes moléculaires, chacune étant composée d'atomes d'un même type. Dans le chapitre 2, une classe de théories de champs avec interaction exponentielle est introduite. L'interaction dépend de deux matrices de ``couplage'' et est suffisamment générale pour inclure toutes les théories de champs de Toda existant dans la littérature. Les symétries de Lie ponctuelles sont obtenues pour les cas où l'on a un nombre fini, infini ou semi-infini de champs. Une attention spéciale est accordée à la présence de l'invariance conforme. Dans le chapitre 3, nous procédons à la classification et à l'étude d'équations linéarisables. Nous examinons tout d'abord l'équation de Gambier continue qui contient, comme réductions, toutes les équations de deuxième ordre intégrables par linéarisation. Nous introduisons par la suite la forme discrète de cette équation et obtenons les conditions d'intégrabilité à l'aide du confinement des singularités. Nous étudions aussi les différentes réductions du cas discret. De plus, nous obtenons des transformations de Schlesinger pour les équations de Gambier discrète et continue. Dans la dernière partie du chapitre, nous étudions une famille d'équations discrètes du deuxième ordre incluant des équations résolubles par linéarisation. Plusieurs cas intégrables sont obtenus. Dans le cas discret, l'étude de l'intégrabilité est faite à l'aide du confinement des singularités. Dans le chapitre 4, nous étudions un autre critère d'intégrabilité: l'entropie algébrique. Nous montrons que les résultats obtenus avec ce critère pour les équations linéarisables sont les mêmes que ceux obtenus avec le confinement des singularités. Nous obtenons de plus une méthode algorithmique pour la détection de la linéarisabilité. Le chapitre 5 est consacré à l'étude d'équations du troisième ordre. Nous obtenons des équations intégrables par des couplages d'équations du premier et du deuxième ordre. Les équations continues sont étudiées à l'aide de l'analyse de Painlevé et le confinement des singularités est utilisé dans le cas discret.

Lafortune, Stephane

2000-09-01

104

Comparison of three parameterizations of subgrid-scale feedback physics for sea spray contributions to near-surface heat fluxes in hurricanes  

NASA Astrophysics Data System (ADS)

Air-sea interaction is unquestionably a critical aspect of hurricane structure and evolution. Recent experiments with high resolution (km-scale) nested models have shown strong sensitivity to the representation of air sea fluxes - both the direct (interfacial) transfers and contributions of sea spray. With the advent of fully coupled (air-wave-ocean) models, it becomes possible to represent the surface fluxes in more physical detail (as opposed to simple wind-speed driven bulk flux algorithms). Recent theoretical work has led to a new representation of sea spray droplet flux that is driven by the fundamental processes associated with blowing large droplets off the tops of breaking waves. In today's high-resolution numerical models sea spray effects are not represented explicitly but are input at modifications to bulk flux relationships applied to the lowest atmospheric grid level. These bulk flux relationships assume a subgrid-scale structure for the scalar profiles (essentially Monin-Obukhov similarity). The actual contribution of the droplet spectrum to the sensible and latent heat fluxes is computed assuming the droplets fall through this specified temperature/humidity environment. However, this is complicated by coupling of the droplet heat fluxes to the mean temperature and humidity profiles near the surface. Thus, the heat and moisture transferred by the droplets modifies the local environment that drives these transfers - a process referred to a feedback. Feedback has little or no effect on the total enthalpy flux carried by the sea spray but it affects the partition of sensible versus latent heat (Bowen ratio). In this paper we will describe and compare three representations (one old and two new) of this subgrid-scale feedback process.

Fairall, C.; Bao, J.; Deszoeke, S.

2007-12-01

105

Arabidopsis aux1rcr1 mutation alters AUXIN RESISTANT1 targeting and prevents expression of the auxin reporter DR5:GUS in the root apex  

PubMed Central

Multilevel interactions of the plant hormones ethylene and auxin coordinately and synergistically regulate many aspects of plant growth and development. This study isolated the AUXIN RESISTANT1 (AUX1) allele aux1rcr1 (RCR1 for REVERSING CTR1-10 ROOT1) that suppressed the root growth inhibition conferred by the constitutive ethylene-response constitutive triple response1-10 (ctr1-10) allele. The aux1rcr1 mutation resulted from an L126F substitution at loop 2 of the plasma membrane-associated auxin influx carrier protein AUX1. aux1rcr1 and the T-DNA insertion mutant aux1-T were both defective in auxin transport and many aspects of the auxin response. Unexpectedly, expression of the auxin-response reporter DR5:GUS in the root apex was substantially prevented by the aux1rcr1 but not the aux1-T mutation, even in the presence of the wild-type AUX1 allele. Following treatment with the synthetic auxin 1-naphthaleneacetic acid (NAA), DR5:GUS expression in aux1rcr1 and aux1-T occurred mainly in the root apex and mature zone. NAA-induced DR5:GUS expression in the root apex was markedly prevented by ethylene in genotypes with aux1rcr1 but not in aux1-T genotypes and the wild type. The effect of aux1rcr1 on DR5:GUS expression seemed to be associated with AUX1-expressing domains. Green fluorescence protein-fused aux1rcr1 was localized in the cytoplasm and probably not to the plasma membrane, indicating important roles of the Lys126 residue at loop 2 in AUX1 targeting. The possible effects of aux1rcr1 on DR5:GUS expression are discussed.

Wen, Chi-Kuang

2013-01-01

106

Arabidopsis aux1rcr1 mutation alters AUXIN RESISTANT1 targeting and prevents expression of the auxin reporter DR5:GUS in the root apex.  

PubMed

Multilevel interactions of the plant hormones ethylene and auxin coordinately and synergistically regulate many aspects of plant growth and development. This study isolated the AUXIN RESISTANT1 (AUX1) allele aux1(rcr1) (RCR1 for REVERSING CTR1-10 ROOT1) that suppressed the root growth inhibition conferred by the constitutive ethylene-response constitutive triple response1-10 (ctr1-10) allele. The aux1(rcr1) mutation resulted from an L126F substitution at loop 2 of the plasma membrane-associated auxin influx carrier protein AUX1. aux1(rcr1) and the T-DNA insertion mutant aux1-T were both defective in auxin transport and many aspects of the auxin response. Unexpectedly, expression of the auxin-response reporter DR5:GUS in the root apex was substantially prevented by the aux1(rcr1) but not the aux1-T mutation, even in the presence of the wild-type AUX1 allele. Following treatment with the synthetic auxin 1-naphthaleneacetic acid (NAA), DR5:GUS expression in aux1(rcr1) and aux1-T occurred mainly in the root apex and mature zone. NAA-induced DR5:GUS expression in the root apex was markedly prevented by ethylene in genotypes with aux1(rcr1) but not in aux1-T genotypes and the wild type. The effect of aux1(rcr1) on DR5:GUS expression seemed to be associated with AUX1-expressing domains. Green fluorescence protein-fused aux1(rcr1) was localized in the cytoplasm and probably not to the plasma membrane, indicating important roles of the Lys(126) residue at loop 2 in AUX1 targeting. The possible effects of aux1(rcr1) on DR5:GUS expression are discussed. PMID:23293348

Yu, Jing; Wen, Chi-Kuang

2013-01-04

107

Physics Contributions and Clinical Outcome With 3D-MRI-Based Pulsed-Dose-Rate Intracavitary Brachytherapy in Cervical Cancer Patients  

SciTech Connect

Purpose: To assess the physics contributions and clinical outcome with three-dimensional magnetic resonance imaging-guided pulsed-dose-rate (PDR) intracavitary brachytherapy in cervical cancer patients. Methods and Materials: The data from 45 patients with primary locally advanced cervical carcinoma were analyzed. The median tumor cervical volume was 64.0 cm{sup 3} (range, 3-178). Of the 45 patients, 24 (53%) had histologic and/or radiologic pelvic involvement. After pelvic with or without para-aortic concomitant chemoradiotherapy, a PDR brachytherapy boost was delivered to a three-dimensional magnetic resonance imaging-based clinical target volume, taking into account the dose-volume constraints for critical organs and optimization of the target volume coverage. Results: At a median follow-up of 26 months (range, 9-47), the 2-year overall survival and disease-free survival rate was 78% and 73%, respectively. At the last follow-up visit, the disease of all patients remained locally controlled. Adding external beam radiotherapy and PDR using the equivalent dose in 2-Gy fractions model, the median dose received by 100% and 90% of the target was 54.4 Gy{sub {alpha}}{sub /{beta}}{sub 10} and 63.5 Gy{sub {alpha}}{sub /{beta}}{sub 10} for the intermediate-risk clinical target volume and 61.6 Gy{sub {alpha}}{sub /{beta}}{sub 10} and 74.9 Gy{sub {alpha}}{sub /{beta}}{sub 10} for the high-risk clinical target volume, respectively. Of the 45 patients, 23 and 2 developed acute Grade 1-2 and Grade 3 complications, respectively; 21 patients presented with delayed Grade 1-2 complications. One other patient presented with Grade 3 vesicovaginal fistula. No Grade 4 or greater complications, whether acute or delayed, were observed. Conclusion: Magnetic resonance imaging-guided PDR brachytherapy with optimization integrating the limits of tolerance to critical organs allows for excellent local control rates. Moreover, the present results have confirmed that the ability to optimize dwell times can contribute to an improvement in local control rates with a low level of late side effects.

Chargari, Cyrus; Magne, Nicolas; Dumas, Isabelle; Messai, Taha; Vicenzi, Lisa; Gillion, Norman [Department of Radiotherapy, Brachytherapy Service, Institut Gustave Roussy, Villejuif (France); Morice, Philippe [Department of Surgical Oncology, Institut Gustave Roussy, Villejuif (France); Haie-Meder, Christine [Department of Radiotherapy, Brachytherapy Service, Institut Gustave Roussy, Villejuif (France)], E-mail: christine.haie@igr.fr

2009-05-01

108

A Longitudinal Examination of the Contribution of Perceived Motor Competence and Actual Motor Competence to Physical Activity in 6 to 9 Year Old Children  

Microsoft Academic Search

This study examined the relationship between perceived motor competence, actual motor competence and physical activity. In particular, it aimed to identify the impact of perceived motor competence (PMC), actual motor competence (AMC), and age and gender on the physical activity levels of young children. A number of factors have been identified as key contributors to children’s physical activity levels. However,

Fleur McIntyre

2009-01-01

109

Yokonolide B, a novel inhibitor of auxin action, blocks degradation of AUX/IAA factors.  

PubMed

Yokonolide B (YkB; also known as A82548A), a spiroketal-macrolide, was isolated from Streptomyces diastatochromogenes B59 in a screen for inhibitors of beta-glucoronidase expression under the control of an auxin-responsive promoter in Arabidopsis. YkB inhibits the expression of auxin-inducible genes as shown using native and synthetic auxin promoters as well as using expression profiling of 8300 Arabidopsis gene probes but does not affect expression of an abscisic acid- and a gibberellin A3-inducible gene. The mechanism of action of YkB is to block AUX/IAA protein degradation; however, YkB is not a general proteasome inhibitor. YkB blocks auxin-dependent cell division and auxin-regulated epinastic growth mediated by auxin-binding protein 1. Gain of function mutants such as shy2-2, slr1, and axr2-1 encoding AUX/IAA transcriptional repressors and loss of function mutants encoding components of the ubiquitin-proteolytic pathway such as axr1-3 and tir1-1, which display increased AUX/IAAs protein stability, are less sensitive to YkB, although axr1 and tir1 mutants were sensitive to MG132, a general proteasome inhibitor, consistent with a site of action downstream of AXR1 and TIR. YkB-treated seedlings displayed similar phenotypes as dominant AUX/IAA mutants. Taken together, these results indicate that YkB acts to block AUX/IAA protein degradation upstream of AXR and TIR, links a shared element upstream of AUX/IAA protein stability to auxin-induced cell division/elongation and to auxin-binding protein 1, and provides a new tool to dissect auxin signal transduction. PMID:12690101

Hayashi, Ken-ichiro; Jones, Alan M; Ogino, Kentaro; Yamazoe, Atsushi; Oono, Yutaka; Inoguchi, Masahiko; Kondo, Hirokiyo; Nozaki, Hiroshi

2003-04-09

110

La chirurgie des cancers de l’ovaire aux stades avancés: techniques et stratégies  

Microsoft Academic Search

\\u000a Résumé:\\u000a   La fréquence relative des cancers de l’ovaire aux stades avancés explique leur mauvais pronostic. Celui-ci ne peut être amélioré\\u000a que par une bonne sensibilité aux chimiothérapies actuelles (Carboplatine + Paclitaxel) et une réduction chirurgicale macroscopiquement\\u000a complète du volume tumoral. L’extension tumorale intra-abdominale étant très hétérogène, la complexité des interventions pour\\u000a parvenir à une exérèse complète est très variable. On

J. Dauplat; G. Le Bouedec; P. Gimbergues; T. Michy

2006-01-01

111

Mecanismos de Acción de las Auxinas y los Herbicidas Auxínicos  

NSDL National Science Digital Library

Se muestra como las auxinas y los herbicidas auxínicos pueden inducir respuestas celulares y se describe el transporte basípeto de las auxinas. También se muestra como los receptores de auxinas reconocen las auxinas y los herbicidas auxínicos, los cuales inducen entonces la transmisión y traducción de señales para activar varios genes; el papel de los productos de esos genes en las respuestas de las plantas es también mostrado.

112

Contributions of Acute Bouts of Vigorous Physical Activity to Explaining Diurnal Variations in Feeling States in Active, Middle-Aged Women  

Microsoft Academic Search

This study describes diurnal variations in feeling states in 84 women as a function of involvement in physical activity. Women completed feeling state checklists before and after bouts of vigorous physical activity that lasted a minimum of 20 min and on a stratified random-sampling protocol in response to a stimulus from an electronic pager. Participants self-reported the date, the time

Lise Gauvin; W. Jack Rejeski; Beth A. Reboussin

2000-01-01

113

Decommissioning of the nuclear licensed facilities at the Fontenay aux Roses CEA center  

Microsoft Academic Search

Available in abstract form only. Full text of publication follows: The French Atomic Energy Commission (CEA) center at Fontenay aux Roses (CEN-FAR) is the Commission's oldest center is located in the southern suburbs of Paris. It was opened on 26 March 1946 to host the first French nuclear reactor ZOE that went critical on 12 December 1946. The first laboratories

Michel Jeanjacques; Laurence Piketty; Nathalie Letuhaire; Lionel Mandard; Igor Meden; David Estivie; Jean Francois Boissonneau; Alain Fouquereau; Eric Pichereau; Cedric Binet

2007-01-01

114

Une évaluation de la qualité du cannabis à usage thérapeutique aux Pays-Bas  

Microsoft Academic Search

Depuis 2003, du cannabis à usage thérapeutique est délivré sur ordonnance dans les pharmacies aux Pays-Bas. La culture, la transformation et le conditionnement de la matière végétale sont réal- isés selon les normes pharmaceutiques et sont supervisés par le Bureau du Cannabis Médical (OMC). La qualité est garantie par des tests réguliers effectués par des laboratoires certifiés. Ce- pendant, un

Arno Hazekamp

2006-01-01

115

Point de référence et aversion aux pertes : quel intérêt pour les gestionnaires ?  

Microsoft Academic Search

Les notions de point de référence et d’aversion aux pertes sont deux éléments essentiels de la prospect theory, qui constitue à ce jour la théorie la plus reconnue concernant la représentation de la prise de décision individuelle dans le risque. L’objectif de cet article est de montrer comment ces notions peuvent être utilisées par les gestionnaires pour améliorer leur compréhension

Corina Paraschiv; Olivier L’Haridon

2009-01-01

116

A DFT study of the structures of Au(x) clusters on a CeO2(111) surface.  

PubMed

Studying the structures of metal clusters on oxide supports is challenging due to their various structural possibilities. In the present work, a simple rule in which the number of Au atoms in different layers of Au(x) clusters is changed successively is used to systematically investigate the structures of Au(x) (x=1-10) clusters on stoichiometric and partially reduced CeO(2)(111) surface by DFT calculations. The calculations indicate that the adsorption energy of a single Au atom on the surface, the surface structure, as well as the Au-Au bond strength and arrangement play the key roles in determining Au(x) structures on CeO(2)(111). The most stable Au(2) and Au(3) clusters on CeO(2)(111) are 2D vertical structures, while the most stable structures of Au(x) clusters (x>3) are generally 3D structures, except for Au(7). The 3D structures of large Au(x) clusters in which the Au number in the bottom layer does not exceed that in the top layer are not stable. The differences between Au(x) on CeO(2)(111) and Mg(100) were also studied. The stabilizing effect of surface oxygen vacancies on Au(x) cluster structures depends on the size of Au(x) cluster and the relative positions of Au(x) cluster and oxygen vacancy. The present work will be helpful in improving the understanding of metal cluster structures on oxide supports. PMID:22323361

Teng, Bo-Tao; Wu, Feng-Min; Huang, Wei-Xin; Wen, Xiao-Dong; Zhao, Lei-Hong; Luo, Meng-Fei

2012-02-09

117

Services aux entreprises, centralité et multipolarisation. Le cas de Lyon  

Microsoft Academic Search

This paper deals with the intrametropolitan location strategies of business services. These activities are traditionnaly highly concentrated in the centre. Recent studies show however that they tend to peripherise and that they can be part of the multipolarisation process. The empirical work consists in an analysis of the urban area of Lyon. The results show that business services contribute to

Anne Aguiléra

2002-01-01

118

Naive Students' Conceptual Development and Beliefs: The Need for Multiple Analyses to Determine What Contributes to Student Success in a University Introductory Physics Course  

ERIC Educational Resources Information Center

This research involved naive physics learners who were interested in majoring in science or engineering. In a semester-long quasi-experimental study, open-ended pretests and weekly interviews were used to analyse the progressive development of students' conceptions relating to sound and wave motion. Semi-structured interviews were also conducted…

Chu, Hye-Eun; Treagust, David F.; Chandrasegaran, A. L.

2008-01-01

119

Naive Students' Conceptual Development and Beliefs: The Need for Multiple Analyses to Determine What Contributes to Student Success in a University Introductory Physics Course  

ERIC Educational Resources Information Center

|This research involved naive physics learners who were interested in majoring in science or engineering. In a semester-long quasi-experimental study, open-ended pretests and weekly interviews were used to analyse the progressive development of students' conceptions relating to sound and wave motion. Semi-structured interviews were also conducted…

Chu, Hye-Eun; Treagust, David F.; Chandrasegaran, A. L.

2008-01-01

120

Humans, Intentionality, Experience And Tools For Learning: Some Contributions From Post-cognitive Theories To The Use Of Technology In Physics Education  

NASA Astrophysics Data System (ADS)

Human cognition cannot be properly understood if we do not take the use of tools into account. The English word cognition stems from the Latin ``cognoscere,'' meaning ``to become acquainted with'' or ``to come to know.'' Following the original Latin meaning we should not only study ``what happens in the head'' if we want to study cognition. Experientially based perspectives, such as pragmatism, phenomenology, phenomenography, and activity theory, stress that we should study person-world relationships. Technologies actively shape the character of human-world relationships. An emergent understanding in modern cognitive research is the co-evolution of the human brain and human use of tools and the active character of perception. Thus, I argue that we must analyze the role of technologies in physics education in order to realize their full potential as tools for learning, and I will provide selected examples from physics learning environments to support this assertion.

Bernhard, Jonte

2007-11-01

121

The diageotropica mutation alters auxin induction of a subset of the Aux\\/IAA gene family in tomato  

Microsoft Academic Search

The diageotropica (dgt) mutation has been proposed to affect either auxin perception or responsiveness in tomato plants. It has previously been demonstrated that the expression of one member of the Aux\\/IAA family of auxin-regulated genes is reduced in dgt plants. Here, we report the cloning of ten new members of the tomato Aux\\/IAA family by PCR amplification based on conserved

Andreas Nebenführ; TJ White; Terri L. Lomax

2000-01-01

122

Independent contribution of overweight\\/obesity and physical inactivity to lower health-related quality of life in community-dwelling older subjects  

Microsoft Academic Search

\\u000a Abstract\\u000a   The study examined the association of nutritional status, obesity and physical activity (PA) with health-related quality of\\u000a life (HRQL) in the elderly, and whether this relationship persists after controlling for confounders attributable to comorbidities,\\u000a functional status and cognitive function. A total of 300 community-dwelling persons (177 women and 123 men) between 66 and\\u000a 79 years of age were randomly

T. Kostka; K. Bogus

2007-01-01

123

Diffusion de neutrons aux petits angles : application à l'étude des macromolécules biologiques en solution  

NASA Astrophysics Data System (ADS)

La diffusion de neutrons aux petits angles (DNPA) permet de sonder les propriétés statiques de la matière sur une échelle spatiale allant de quelques dixièmes à quelques dizaines de nanomètres. Cette technique est ainsi particulièrement bien adaptée à l'étude des macromolécules en solution. Il est possible d'accéder à des grandeurs moyennes qui caractérisent la conformation qu'adoptent les macromolécules ou leurs interactions thermodynamiques. Le cours expose à des non spécialistes les différentes grandeurs mesurables et les méthodes à utiliser pour y accéder. En particulier sont abordées: 1) les mesures effectuées dans la limite du vecteur de diffusion nul qui sont liées aux fluctuations de concentration; 2) les notions de facteur de forme, de facteur de structure dots 3) les différentes façon de jouer avec le contraste. Les notions introduites sont illustrées par des exemples didactiques empruntés à la littérature et concernant des macromolécules biologiques en solution.

Lairez, D.; Pelta, J.

2005-11-01

124

Genome-wide analysis of Aux/IAA and ARF gene families in Populus trichocarpa  

SciTech Connect

Auxin/Indole-3-Acetic Acid (Aux/IAA) and Auxin Response Factor (ARF) transcription factors are key regulators of auxin responses in plants. A total of 35 Aux/IAA and 39 ARF genes were identified in the Populus genome. Comparative phylogenetic analysis revealed that the subgroups PoptrARF2, 6, 9 and 16 and PoptrIAA3, 16, 27 and 29 have differentially expanded in Populus relative to Arabidopsis. Activator ARFs were found to be two fold-overrepresented in the Populus genome. PoptrIAA and PoptrARF gene families appear to have expanded due to high segmental and low tandem duplication events. Furthermore, expression studies showed that genes in the expanded PoptrIAA3 subgroup display differential expression. The gene-family analysis reported here will be useful in conducting future functional genomics studies to understand how the molecular roles of these large gene families translate into a diversity of biologically meaningful auxin effects.

Kalluri, Udaya C [ORNL; DiFazio, Stephen P [West Virginia University; Brunner, A. [Virginia Polytechnic Institute and State University (Virginia Tech); Tuskan, Gerald A [ORNL

2007-01-01

125

Alterations des fonctions de reproduction chez les souris males deficientes en recepteur aux estrogenes  

Microsoft Academic Search

Resume  La délétion du récepteur aux estrogènes (estrogen receptor knock out i.e ERKO) chez la souris mâle conduit à la stérilité\\u000a suite à une déficience de la gamétogenèse associée à des altérations du comportement sexuel. En fonction de l’âge, le développement\\u000a testiculaire est de plus en plus anormal et les cellules germinales dégénèrent. Les taux circulants de gonadotropines et de\\u000a testostérone

K. S. Korach; J. Lindzey

1998-01-01

126

Introduction générale aux Œuvres morales et politiques de Jean-Baptiste Say  

Microsoft Academic Search

Les textes présentés dans ce volume couvrent une période qui va de 1789 à 1832. De 22 ans à 65 ans, âge auquel il est mort, Jean-Baptiste Say n'a pas cessé de s'intéresser passionnément aux questions politiques de son temps. Il en a été un des acteurs, modeste à ses débuts, puis de plus en plus important, côtoyant les plus

André Tiran; Emmanuel Blanc

2003-01-01

127

DE L'ACCOMMODATION DES ENSEIGNANTS AUX EFFETS DES NOUVELLES POLITIQUES EDUCATIVES. UNE ETUDE DE CAS  

Microsoft Academic Search

Systèmes scolaires et identité professionnelle : un contexte mouvant Suite aux évolutions récentes des politiques éducat ives, les enseignants subissent un certain nombre de pressions. Si le métier n'en a jamais été exempt, loin de là, celles que l'on peut constater aujourd'hui sont notamment issues de l'éd ition régulière de nouvelles directives et prescriptions. Dans le cadre qui est le

Danièle Périsset

128

Chemical Composition and Geologic History of Saline Waters in Aux Vases and Cypress Formations, Illinois Basin  

Microsoft Academic Search

Seventy-six samples of formation waters were collected from oil wells producing from the Aux Vases or Cypress Formations in the Illinois Basin. Forty core samples of the reservoir rocks were also collected from the two formations. Analyses of the samples indicated that the total dissolved solids content (TDS) of the waters ranged from 43,300 to 151,400 mg\\/L, far exceeding the

Ilham Demir; Beverly Seyler

1999-01-01

129

INVESTISSEMENTS FRANÇAIS AUX ETATS-UNIS, STRATÉGIES DE CROISSANCE EXTERNE ET RÉACTIONS DU MARCHÉ BOURSIER  

Microsoft Academic Search

Résumé : l'objectif de cet article est d'évaluer la réaction des marchés boursiers suite à l'annonce d'investissements directs par des entreprises françaises aux Etats-Unis. L'étude empirique se fonde sur une méthodologie d'étude d'événements, destinée à mesurer les rendements anormaux moyens et les rendements anormaux moyens cumulés, sur les cotations à la Bourse de Paris, associés à l'annonce d'acquisitions de firmes

Pierre-Xavier MESCHI; Emmanuel METAIS

130

The formation of orbital moments on iron impurities in Ag1 - xAux alloys  

Microsoft Academic Search

Using the high specificity and sensitivity of the in-beam perturbed gamma-ray angular distribution method, we have investigated the magnetic behavior of very dilute 54Fe probes in Ag1 - xAux alloys. The nuclear damping time and local susceptibility of Fe are found to depend strongly on its local environment, showing inhomogeneous line broadening as well as discrete magnetic responses due to

R. Kirsch; M. J. Prandolini; O. Beutler; W. D. Brewer; M. Gruyters; J. Kapoor; D. Riegel; H. Ebert; S. Frota-Pessôa

2002-01-01

131

L’hostilité aux OGM survit-elle à des produits attractifs ?  

Microsoft Academic Search

Nous testons ici les dispositions à payer des consommateurs pour des aliments transgéniques de seconde génération, c’est-à-dire ayant des caractéristiques innovantes attractives pour le consommateur par rapport au produit conventionnel. Nous testons également les dispositions à payer de tels produits lorsqu’ils sont obtenus avec des technologies alternatives aux biotechnologies transgéniques. Les résultats indiquent que la disposition à payer positive pour

Elsa Kassardjian; Stéphane Robin; Bernard Ruffieux

2008-01-01

132

L'hostilité aux OGM survit-elle à des produits attractifs ?  

Microsoft Academic Search

Nous testons ici les dispositions à payer des consommateurs pour des aliments transgéniques de seconde génération, c'est-à-dire ayant des caractéristiques innovantes attractives pour le consommateur par rapport au produit conventionnel. Nous testons également les dispositions à payer de tels produits lorsqu'ils sont obtenus avec des technologies alternatives aux biotechnologies transgéniques. Les résultats indiquent que la disposition à payer positive pour

Elsa Kassardjian; Stéphane Robin; Bernard Ruffieux

2008-01-01

133

The Morne Aux Diables volcano, Dominica, Lesser Antilles: A stratigraphic and petrologic study.  

NASA Astrophysics Data System (ADS)

Morne Aux Diables is a topographically distinct stratovolcano located at the northernmost end of the island of Dominica, Lesser Antilles. In 2007, observations were conducted, and over 3,000 digital photographs were taken, of the well-exposed sea cliffs around Dominica. These observations, together with photogeological analysis of approximately 500 of these digital photographs of sea cliffs around the northern part of Dominica, have significantly improved our understanding of the geology of Morne aux Diables volcano, which previously had been based on scattered land exposures. The photographs were used to identify genetic packages of strata related to volcanogenic events and trace them around large sectors of the volcano's flanks. Based on these new studies, together with previous data, Morne aux Diables appears to have undergone two periods of activity, an older period dated between 2.1-1.5 Ma and a younger period dated at around 50,000 years B.P. Deposits associated with the older cone-forming activity are primarily composed of block and ash flows and surges associated with Pelean-style activity. These can be subdivided into a number of sequences based on the presence of paleosols. Domes associated with these eruptions are found both in the central vent area as well as around the flanks of the volcano. The upper deposits in the sea cliffs on the eastern, northern and western flanks are a thick sequence of surges that have been provisionally correlated with a well-exposed sequence of semi-vesicular block and ash flows and surge deposits at Morne a Louis on the west coast. The presence of these surge deposits at the top of the sea cliffs suggests that the older period of activity ended with open-crater Asama-style eruptions. Following an extensive quiescent period, renewed Pelean-style activity produced valley-fill block and ash flow and surge deposits, exposed on both the eastern and western sides of the volcano, together with associated domes (both central and parasitic). Petrographic studies show that Morne Aux Diables volcano is composed of andesites and dacites with a mineral assemblage of plagioclase+augite±hypersthene with minor hornblende and quartz. Geochemically both the older and younger volcanic rocks show trends, especially in terms of alkalis, that are slightly lower and cross- cut from those shown by the other centers on Dominica. These stratigraphic and petrologic studies will help further elucidate the volcanic history of Morne aux Diables and allow a petrologic-stratigraphic model of its formation.

Daly, G. L.; Smith, A. L.; Rheubottom, A. N.; Fryxell, J. E.

2008-12-01

134

Cortisol rapidly affects amplitudes of heartbeat-evoked brain potentials-Implications for the contribution of stress to an altered perception of physical sensations?  

PubMed

Little is known about the impact of stress and stress hormones on the processing of visceral-afferent signals. Clinical data suggest that cortisol may lower the threshold for interoceptive stimuli, while a pharmacological administration of cortisol decreases the sensitivity for physical symptoms. To clarify the role of cortisol for the processing of interoceptive signals, we investigated 16 healthy men on two occasions, once during the infusion of 4mg of cortisol and once during the infusion of a placebo substance. Heartbeat-evoked potentials (HEP; derived from resting EEG and ECG, during open and closed eyes), which are psychophysiological indicators for the cortical processing of cardioceptive signals, were measured over 6-min periods once before, and four times after the infusion (1-7, 11-17, 21-27 and 31-37min). We found that HEP amplitudes were higher during open than during closed eyes between 1 and 17min after cortisol infusion. There was no effect of cortisol on heart rate. We conclude that cortisol may rapidly modulate the cortical processing of cardioceptive neural signals. These results may have relevance for the effects of stress on the development and maintenance of psychosomatic symptoms. PMID:23850227

Schulz, André; Strelzyk, Florian; Ferreira de Sá, Diana S; Naumann, Ewald; Vögele, Claus; Schächinger, Hartmut

2013-07-11

135

Impuretés et systèmes corrélés. Des chaînes aux cuprates supraconducteurs  

NASA Astrophysics Data System (ADS)

Impurities and correlated systems Discovery of high TC superconductors has opened the new field of strongly correlated fermions physics. In these compounds, mostly transition metal oxides, strong correlations between electrons affect sharply their electronic properties. In order to determine accurately these correlations and their possible link with superconductivity, we study the effect of local defects such as non magnetic impurities. In fact, in the more simple case of insulating spin chains and ladders, these impurities induce a staggered magnetism in their neighborhood which reveals the underlying electronic correlations. Similar effects are observed in high TC superconductors, using local probes such as nuclear magnetic resonance. These observations allow to get a better understanding of both normal and superconducting state of these oxides, both full of surprises. La découverte des supraconducteurs à haute température critique a ouvert la voie à une nouvelle physique, celle des fermions fortement corrélés. Dans ces systèmes, le plus souvent des oxydes de métaux de transition, les fortes corrélations entre électrons affectent profondément leurs propriétés électroniques et induisent de nouveaux états originaux : liquides de spins, supraconductivité, etc. Pour mesurer ces corrélations et ainsi déterminer leur lien éventuel avec la supraconductivité, nous proposons d'étudier l'effet de défauts ponctuels tels que des impuretés non magnétiques. En effet, dans le cas plus simple de chaînes ou d'échelles de spin isolantes, ces impuretés induisent dans leur voisinage immédiat un magnétisme alterné révélateur des corrélations électroniques. Des effets semblables sont observés dans les supraconducteurs à haute température critique, grâce à des sondes locales comme la résonance magnétique nucléaire. Ces observations permettent de mieux comprendre à la fois l'état normal et supraconducteur de ces oxydes, tous deux riches en surprises.

Bobroff, J.

2005-01-01

136

Contribution aux etudes de signaux radar de surfaces de mer et mise au point d'un traitement rapide  

Microsoft Academic Search

Dans le but d'utiliser un radar comme instrument de mesures oceanographiques, il apparai t necessaire de developper des techniques pour extraire les caracteristiques d'une surface de mer a partir du signal recu par le radar. La plupart des algorithmes existant considerent les images radar comme des photographies de la surface oceanique, negligeant l'effet de la vitesse de rotation du radar

Anne-Laure Jousselme

1997-01-01

137

Physical Processes Contributing To Small-scale Vertical Movements During Changing Inplane Stresses In Rift Basins and At Passive Continental Margins  

NASA Astrophysics Data System (ADS)

The vertical movements during a regional stress reversal in a rifted basin or on a passive continental margin are examined using a numerical 2D thermo-mechanical finite element model with a visco-elastic-plastic rheology. Three different physical mechanisms are recognized in small-scale vertical movements at small inplane force variations: elastic dilatation, elastic flexure, and permanent deformation. Their rela- tive importance depend on the applied force, the duration of the force, and the thermal structure of the lithosphere. Elastic material dilatation occurs whenever the stress state changes. A reversal from extension to compression therefore immediately leads to elastic dilatation, and re- sults in an overall subsidence of the entire profile. Simultaneously with dilatation the lithosphere reacts with flexure. The significance of the flexural component strongly depends on the thermal structure of the lithosphere. The polarity and amplitude of the flexure depends on the initial (before compression) loading of the lithosphere. Gener- ally, the flexural effects lead to subsidence of the overdeep in the landward part of the basin and a small amount of uplift at the basin flanks. The amplitudes of the flexural response are small and comparable with the amplitudes of the elastic dilatation. With continuing compression permanent deformation and lithospheric thickening becomes increasingly important. Ultimately, the thickened part of the lithosphere stands out as an inverted zone. The amount of permanent deformation is directly connected with the size and duration of the applied force, but even a relatively small force leads to inversion tectonics in the landward part of the basin. The conclusions are: 1) small stress induced vertical movements in rift basins and at passive continental margins are the result of a complex interaction of at least three different processes, 2) the total sediment loaded amplitudes resulting from these pro- cesses are small (2-300 m) for inplane forces up to 1.5·1012 N/m.

Paulsen, G. E.; Nielsen, S. B.; Hansen, D. L.

138

Aux1p/Swa2p Is Required for Cortical Endoplasmic Reticulum Inheritance in Saccharomyces cerevisiae  

PubMed Central

In the yeast Saccharomyces cerevisiae, the endoplasmic reticulum (ER) is found at the periphery of the cell and around the nucleus. The segregation of ER through the mother-bud neck may occur by more than one mechanism because perinuclear, but not peripheral ER, requires microtubules for this event. To identify genes whose products are required for cortical ER inheritance, we have used a Tn3-based transposon library to mutagenize cells expressing a green fluorescent protein-tagged ER marker protein (Hmg1p). This approach has revealed that AUX1/SWA2 plays a role in ER inheritance. The COOH terminus of Aux1p/Swa2p contains a J-domain that is highly related to the J-domain of auxilin, which stimulates the uncoating of clathrin-coated vesicles. Deletion of the J-domain of Aux1p/Swa2p leads to vacuole fragmentation and membrane accumulation but does not affect the migration of peripheral ER into daughter cells. These findings suggest that Aux1p/Swa2p may be a bifunctional protein with roles in membrane traffic and cortical ER inheritance. In support of this hypothesis, we find that Aux1p/Swa2p localizes to ER membranes.

Du, Yunrui; Pypaert, Marc; Novick, Peter; Ferro-Novick, Susan

2001-01-01

139

Adiabatic and nonadiabatic contributions to the energy of a system subject to a time-dependent perturbation: complete separation and physical interpretation.  

PubMed

When a time-dependent perturbation acts on a quantum system that is initially in the nondegenerate ground state ?0> of an unperturbed Hamiltonian H(0), the wave function acquires excited-state components ?k> with coefficients c(k)(t) exp(-iE(k)t/?), where E(k) denotes the energy of the unperturbed state ?k>. It is well known that each coefficient c(k)(t) separates into an adiabatic term a(k)(t) that reflects the adjustment of the ground state to the perturbation--without actual transitions--and a nonadiabatic term b(k)(t) that yields the probability amplitude for a transition to the excited state. In this work, we prove that the energy at any time t also separates completely into adiabatic and nonadiabatic components, after accounting for the secular and normalization terms that appear in the solution of the time-dependent Schro?dinger equation via Dirac's method of variation of constants. This result is derived explicitly through third order in the perturbation. We prove that the cross-terms between the adiabatic and nonadiabatic parts of c(k)(t) vanish, when the energy at time t is determined as an expectation value. The adiabatic term in the energy is identical to the total energy obtained from static perturbation theory, for a system exposed to the instantaneous perturbation ?H'(t). The nonadiabatic term is a sum over excited states ?k> of the transition probability multiplied by the transition energy. By evaluating the probabilities of transition to the excited eigenstates ?k'(t)> of the instantaneous Hamiltonian H(t), we provide a physically transparent explanation of the result for E(t). To lowest order in the perturbation parameter ?, the probability of finding the system in state ?k'(t)> is given by ?(2) ?b(k)(t)?(2). At third order, the transition probability depends on a second-order transition coefficient, derived in this work. We indicate expected differences between the results for transition probabilities obtained from this work and from Fermi's golden rule. PMID:23126697

Mandal, Anirban; Hunt, Katharine L C

2012-10-28

140

Morne aux Diables. a potentially active volcano in northern Dominica, Lesser Antilles  

NASA Astrophysics Data System (ADS)

The island of Dominica, which is located near the center of the Lesser Antilles island arc, comprises at least 8 potentially active volcanoes. One of these is Morne aux Diables, an isolated composite cone situated at the extreme northern end of the island. Age dating suggests that the main cone building activity occurred between 1.5 and 1.0 million years ago. Exposed on the volcano's flanks however are a number of unconsolidated valley-fill block and ash flow deposits suggesting more recent activity. One of these deposits, on the north-east flank of the volcano, has been recently dated at > 46,000 years B.P. Other evidence of potential activity from this center includes the presence of warm (27°C), acidic (pH 1.6), sulfate-rich springs on the summit of the volcano, hot springs on the coast, and the occurrence in 2002 and 2003 of shallow earthquake swarms partially located beneath the volcano. Morne aux Diables is dominantly composed of deposits of block and ash flows and associated domes from Pelean-style activity, however, semi-vesicular andesite block and ash flows and surges (Asama-style activity) and pumiceous lapilli falls (Plinian-style activity) are locally abundant. The Pelean domes are located both in the summit region and along the southern flanks of the volcano. Petrologically, the volcano is composed of a monotonous series of porphyritic andesites and dacites containing phenocrysts of plagioclase+augite-hypersthene with very sparse crystals of hornblende and quartz. Petrological models suggest the Morne aux Diables andesites and dacites can be produced by fractional crystallization of basaltic magma (such as those erupted from centers such as Morne Anglais and Morne Plat Pays in the south). Minor variations within this suite of andesites and dacites can be related to upper crustal fractionation of phenocryst phases.

Rheubottom, A. N.; Smith, A. L.; Roobol, M. J.

2005-12-01

141

Soins primaires aux adultes ayant une d?ficience d?veloppementale  

PubMed Central

Résumé Objectif Mettre à jour les lignes directrices canadiennes de 2006 sur les soins primaires aux adultes ayant une déficience développementale (DD) et présenter des recommandations pratiques fondées sur les connaissances actuelles pour traiter des problèmes de santé particuliers chez des adultes ayant une DD. Qualité des preuves Des professionnels de la santé expérimentés participant à un colloque et un groupe de travail subséquent ont discuté et convenu des révisions aux lignes directrices de 2006 en se fondant sur une recherche documentaire exhaustive, la rétroaction obtenue des utilisateurs du guide de pratique et les expériences cliniques personnelles. La plupart des preuves disponibles dans ce domaine viennent de l’opinion d’experts ou de déclarations consensuelles publiées (niveau III). Message principal Les adultes ayant une DD ont des problèmes de santé complexes, dont plusieurs diffèrent de ceux de la population en général. De bons soins primaires permettent d’identifier les problèmes de santé particuliers dont souffrent les adultes ayant une DD pour améliorer leur qualité de vie et leur accès aux soins de santé et prévenir la morbidité et le décès prématuré. Ces lignes directrices résument les problèmes de santé générale, physique, comportementale et mentale des adultes ayant une DD que devraient connaître les professionnels des soins primaires et présentent des recommandations pour le dépistage et la prise en charge en se basant sur les connaissances actuelles que les cliniciens peuvent mettre en pratique. En raison de l’interaction des facteurs biologiques, psychoaffectifs et sociaux qui contribuent à la santé et au bien-être des adultes ayant une DD, ces lignes directrices insistent sur la participation des aidants, l’adaptation des interventions, au besoin, et la consultation auprès de divers professionnels de la santé quand ils sont accessibles. Elles mettent aussi en évidence la nature éthique des soins. Les lignes directrices sont formulées dans le contexte d’un cadre éthique qui tient compte des questions comme le consentement éclairé et l’évaluation des bienfaits pour la santé par rapport aux risques de préjudice. Conclusion La mise en œuvre des lignes directrices proposées ici améliorerait la santé des adultes ayant une DD et minimiserait les disparités sur les plans de la santé et des soins de santé entre les adultes ayant une DD et la population en général.

Sullivan, William F.; Berg, Joseph M.; Bradley, Elspeth; Cheetham, Tom; Denton, Richard; Heng, John; Hennen, Brian; Joyce, David; Kelly, Maureen; Korossy, Marika; Lunsky, Yona; McMillan, Shirley

2011-01-01

142

Aperçu phytosociologique sur les pâturages naturels aux environs de castelo de vide  

Microsoft Academic Search

Résumé  Etudiant les jachères pâturées de la zone de culture du seigle, aux environs de Castelo de Vide, l'auteur définit une association\\u000a nouvelle — le Lupineto-Astrocarpetum purpurascentis — appartenant à l'Helianthemion guttati Br.-Bl. (1931) 1940 em.\\u000a \\u000a Cette association occupe les sols siliceux, nettement acides, frais pendant l'hiver et une partie du printemps. Elle présente\\u000a un caractère floristique méditerranéen très net, tout

J. Malato-Beliz

1954-01-01

143

Aspects électrochimiques de l'essai accéléré de perméabilité aux ions chlorures  

Microsoft Academic Search

Résumé  Cet article décrit les aspects électrochimiques de l'essai accéléré de perméabilité aux chlorures; il souligne le rôle de\\u000a la tension appliquée à la cellule et celui de la résistance électrique du béton. Ces deux paramètres déterminent les potentiels\\u000a d'électrodes et conditionnent les réactions électrochimiques qui sont susceptibles de s'y développer. Dans les conditions\\u000a opératoires classiques de l'essai, l'électrolyse de l'eau

W. Prince; J.-P. Ollivier; O. Truc

1999-01-01

144

Improvement in High School physics Teaching will Increase Physics Enrollment  

NASA Astrophysics Data System (ADS)

We study the effect of better high school teaching on the physics enrollment. Adequate mathematics background, physics curriculum, teaching methodology and the teacher-student relationship contribute to attract students to study physics at the college level.

Masood, Samina

2008-04-01

145

Office Productivity: Contributions of the Physical Setting.  

National Technical Information Service (NTIS)

This study investigated the effect of ergonomically-suited, task-oriented workstations on employee productivity and satisfaction, and analyzed the costs and benefits of providing new state-of-the-art office furniture. Facility managers can use the informa...

J. Francis D. L. Dressel S. A. MacArthur R. D. Neathammer

1986-01-01

146

Evolution and development: what can physics contribute  

NASA Astrophysics Data System (ADS)

The genome contains both the 'parts list' for an organism, the genes, as well as the instructions about how to assemble it. Many of the current genome sequencing projects have been motivated by the desire to compare sufficiently similar organism, to discover what parts of the genome are functional, and how they define the differences between the organisms. A particularly fruitful place to study gene regulation (the `assembly manual') is development from egg to adult. Current progress in deducing developmental regulatory networks from the genome will be illustrated with the early, head-tail patterning in the fly embryo. The recent sequencing of a second species of fly, has allowed us to computationally screen for interesting differences in the early embryonic patterning and test these experimentally. This provides a first glimpse of how regulation evolves.

Siggia, Eric

2005-03-01

147

The Tomato Aux/IAA Transcription Factor IAA9 Is Involved in Fruit Development and Leaf MorphogenesisW?  

PubMed Central

Auxin/indole-3-acetic acid (Aux/IAA) proteins are transcriptional regulators that mediate many aspects of plant responses to auxin. While functions of most Aux/IAAs have been defined mainly by gain-of-function mutant alleles in Arabidopsis thaliana, phenotypes associated with loss-of-function mutations have been scarce and subtle. We report here that the downregulation of IAA9, a tomato (Solanum lycopersicum) gene from a distinct subfamily of Aux/IAA genes, results in a pleiotropic phenotype, consistent with its ubiquitous expression pattern. IAA9-inhibited lines have simple leaves instead of wild-type compound leaves, and fruit development is triggered before fertilization, giving rise to parthenocarpy. This indicates that IAA9 is a key mediator of leaf morphogenesis and fruit set. In addition, antisense plants displayed auxin-related growth alterations, including enhanced hypocotyl/stem elongation, increased leaf vascularization, and reduced apical dominance. Auxin dose–response assays revealed that IAA9 downregulated lines were hypersensitive to auxin, although the only early auxin-responsive gene that was found to be upregulated in the antisense lines was IAA3. The activity of the IAA3 promoter was stimulated in the IAA9 antisense genetic background, indicating that IAA9 acts in planta as a transcriptional repressor of auxin signaling. While no mutation in any member of subfamily IV has been reported to date, the phenotypes associated with the downregulation of IAA9 reveal distinct and novel roles for members of the Aux/IAA gene family.

Wang, Hua; Jones, Brian; Li, Zhengguo; Frasse, Pierre; Delalande, Corinne; Regad, Farid; Chaabouni, Salma; Latche, Alain; Pech, Jean-Claude; Bouzayen, Mondher

2005-01-01

148

Lightning Physics and Effects  

Microsoft Academic Search

Lightning Physics and Effects is not a lightning book; it is a lightning encyclopedia. Rarely in the history of science has one contribution covered a subject with such depth and thoroughness as to set the enduring standard for years, perhaps even decades, to come. This contribution covers all aspects of lightning, including lightning physics, lightning protection, and the interaction of

Richard E. Orville

2004-01-01

149

Measuring Physical Activity Environments  

Microsoft Academic Search

Physical activity is usually done in specific types of places, referred to as physical activity environments. These often include parks, trails, fitness centers, schools, and streets. In recent years, scientific interest has increased notably in measuring physical activity environments. The present paper provides an historical overview of the contributions of the health, planning, and leisure studies fields to the development

James F. Sallis

2009-01-01

150

Modelisation de la diffusion sur les surfaces metalliques: De l'adatome aux processus de croissance  

NASA Astrophysics Data System (ADS)

Cette these est consacree a l'etude des processus de diffusion en surface dans le but ultime de comprendre, et de modeliser, la croissance d'une couche mince. L'importance de bien mai triser la croissance est primordiale compte tenu de son role dans la miniaturisation des circuits electroniques. Nous etudions ici les surface des metaux nobles et de ceux de la fin de la serie de transition. Dans un premier temps, nous nous interessons a la diffusion d'un simple adatome sur une surface metallique. Nous avons, entre autres, mis en evidence l'apparition d'une correlation entre evenements successifs lorsque la temperature est comparable a la barriere de diffusion, i.e., la diffusion ne peut pas etre associee a une marche aleatoire. Nous proposons un modele phenomenologique simple qui reproduit bien les resultats des simulations. Ces calculs nous ont aussi permis de montrer que la diffusion obeit a la loi de Meyer-Neldel. Cette loi stipule que, pour un processus active, le prefacteur augmente exponentiellement avec la barriere. En plus, ce travail permet de clarifier l'origine physique de cette loi. En comparant les resultats dynamiques aux resultats statiques, on se rend compte que la barriere extraite des calculs dynamiques est essentiellement la meme que celle obtenue par une approche statique, beaucoup plus simple. On peut donc obtenir cette barriere a l'aide de methodes plus precises, i.e., ab initio, comme la theorie de la fonctionnelle de la densite, qui sont aussi malheureusement beaucoup plus lourdes. C'est ce que nous avons fait pour plusieurs systemes metalliques. Nos resultats avec cette derniere approche se comparent tres bien aux resultats experimentaux. Nous nous sommes attardes plus longuement a la surface (111) du platine. Cette surface regorge de particularites interessantes, comme la forme d'equilibre non-hexagonale des i lots et deux sites d'adsorption differents pour l'adatome. De plus, des calculs ab initio precedents n'ont pas reussi a confirmer la forme d'equilibre et surestiment grandement la barriere. Nos calculs, plus complets et dans un formalisme mieux adapte a ce genre de probleme, predisent correctement la forme d'equilibre, qui est en fait due a un relachement different du stress de surface aux deux types de marches qui forment les cotes des i lots. Notre valeur pour la barriere est aussi fortement diminuee lorsqu'on relaxe les forces sur les atomes de la surface, amenant le resultat theorique beaucoup plus pres de la valeur experimentale. Nos calculs pour le cuivre demontre en effet que la diffusion de petits i lots pendant la croissance ne peut pas etre negligee dans ce cas, mettant en doute la valeur des interpretations des mesures experimentales. (Abstract shortened by UMI.)

Boisvert, Ghyslain

151

EXTERNAL ASSISTANCE FOR FOOD PRODUCTION TO LDCs \\/ L'AIDE EXTERIEURE A LA PRODUCTION ALIMENTAIRE AUX PVD  

Microsoft Academic Search

Un examen rapide de l'aide à la production alimentaire durant la période 1975-1980 paraît intéressant en raison de la perspective d'une réduction de l'aide extérieure aux pays en voie de développement (PVD). L'aide à la production alimentaire est passée de 3,3 milliards de dollars en 1975 à 8,0-8,5 milliards en 1980, soit une augmentation en termes réels de près de

Martha Aida Eid

1981-01-01

152

Phloem-specific expression of a melon Aux/IAA in tomato plants alters auxin sensitivity and plant development.  

PubMed

Phloem sap contains a large repertoire of macromolecules in addition to sugars, amino acids, growth substances and ions. The transcription profile of melon phloem sap contains over 1000 mRNA molecules, most of them associated with signal transduction, transcriptional control, and stress and defense responses. Heterografting experiments have established the long-distance trafficking of numerous mRNA molecules. Interestingly, several trafficking transcripts are involved in the auxin response, including two molecules coding for auxin/indole acetic acid (Aux/IAA). To further explore the biological role of the melon Aux/IAA transcript CmF-308 in the vascular tissue, a cassette containing the coding sequence of this gene under a phloem-specific promoter was introduced into tomato plants. The number of lateral roots was significantly higher in transgenic plants expressing CmF-308 under the AtSUC2 promoter than in controls. A similar effect on root development was obtained after transient expression of CmF-308 in source leaves of N. benthamiana plants. An auxin-response assay showed that CmF-308-transgenic roots are more sensitive to auxin than control roots. In addition to the altered root development, phloem-specific expression of CmF-308 resulted in shorter plants, a higher number of lateral shoots and delayed flowering, a phenotype resembling reduced apical dominance. In contrast to the root response, cotyledons of the transgenic plants were less sensitive to auxin than control cotyledons. The reduced auxin sensitivity in the shoot tissue was confirmed by lower relative expression of several Aux/IAA genes in leaves and an increase in the relative expression of a cytokinin-response regulator, TRR8/9b. The accumulated data suggest that expression of Aux/IAA in the phloem modifies auxin sensitivity in a tissue-specific manner, thereby altering plant development. PMID:23986770

Golan, Guy; Betzer, Rotem; Wolf, Shmuel

2013-08-23

153

Application of the New Decommissioning Regulation to the Nuclear Licensed Facilities (NLF) at Fontenay-aux-Roses's Nuclear Center (CEA)  

Microsoft Academic Search

This abstract describes the application of the new decommissioning regulation on all Nuclear Licensed Facilities (NLF is to say INB in French) at Fontenay-aux-Roses's Center (CEA\\/FAR). The decommissioning process has been applied in six buildings which are out of the new nuclear perimeter proposed (buildings no 7, no 40, no 94, no 39, no 52\\/1 and no 32) and three

Josiane Sauret; Laurence Piketty; Michel Jeanjacques

2008-01-01

154

Phloem-specific expression of a melon Aux/IAA in tomato plants alters auxin sensitivity and plant development  

PubMed Central

Phloem sap contains a large repertoire of macromolecules in addition to sugars, amino acids, growth substances and ions. The transcription profile of melon phloem sap contains over 1000 mRNA molecules, most of them associated with signal transduction, transcriptional control, and stress and defense responses. Heterografting experiments have established the long-distance trafficking of numerous mRNA molecules. Interestingly, several trafficking transcripts are involved in the auxin response, including two molecules coding for auxin/indole acetic acid (Aux/IAA). To further explore the biological role of the melon Aux/IAA transcript CmF-308 in the vascular tissue, a cassette containing the coding sequence of this gene under a phloem-specific promoter was introduced into tomato plants. The number of lateral roots was significantly higher in transgenic plants expressing CmF-308 under the AtSUC2 promoter than in controls. A similar effect on root development was obtained after transient expression of CmF-308 in source leaves of N. benthamiana plants. An auxin-response assay showed that CmF-308-transgenic roots are more sensitive to auxin than control roots. In addition to the altered root development, phloem-specific expression of CmF-308 resulted in shorter plants, a higher number of lateral shoots and delayed flowering, a phenotype resembling reduced apical dominance. In contrast to the root response, cotyledons of the transgenic plants were less sensitive to auxin than control cotyledons. The reduced auxin sensitivity in the shoot tissue was confirmed by lower relative expression of several Aux/IAA genes in leaves and an increase in the relative expression of a cytokinin-response regulator, TRR8/9b. The accumulated data suggest that expression of Aux/IAA in the phloem modifies auxin sensitivity in a tissue-specific manner, thereby altering plant development.

Golan, Guy; Betzer, Rotem; Wolf, Shmuel

2013-01-01

155

Alkoxy-auxins are selective inhibitors of auxin transport mediated by PIN, ABCB, and AUX1 transporters.  

PubMed

Polar auxin movement is a primary regulator of programmed and plastic plant development. Auxin transport is highly regulated at the cellular level and is mediated by coordinated transport activity of plasma membrane-localized PIN, ABCB, and AUX1/LAX transporters. The activity of these transporters has been extensively analyzed using a combination of pharmacological inhibitors, synthetic auxins, and knock-out mutants in Arabidopsis. However, efforts to analyze auxin-dependent growth in other species that are less tractable to genetic manipulation require more selective inhibitors than are currently available. In this report, we characterize the inhibitory activity of 5-alkoxy derivatives of indole 3-acetic acid and 7-alkoxy derivatives of naphthalene 1-acetic acid, finding that the hexyloxy and benzyloxy derivatives act as potent inhibitors of auxin action in plants. These alkoxy-auxin analogs inhibit polar auxin transport and tropic responses associated with asymmetric auxin distribution in Arabidopsis and maize. The alkoxy-auxin analogs inhibit auxin transport mediated by AUX1, PIN, and ABCB proteins expressed in yeast. However, these analogs did not inhibit or activate SCF(TIR1) auxin signaling and had no effect on the subcellular trafficking of PIN proteins. Together these results indicate that alkoxy-auxins are inactive auxin analogs for auxin signaling, but are recognized by PIN, ABCB, and AUX1 auxin transport proteins. Alkoxy-auxins are powerful new tools for analyses of auxin-dependent development. PMID:21084292

Tsuda, Etsuko; Yang, Haibing; Nishimura, Takeshi; Uehara, Yukiko; Sakai, Tatsuya; Furutani, Masahiko; Koshiba, Tomokazu; Hirose, Masakazu; Nozaki, Hiroshi; Murphy, Angus S; Hayashi, Ken-ichiro

2010-11-17

156

Depositional facies and hydrocarbon reservoir compartmentalization of the Mississippian Aux Vases Formation at King Field, Jefferson County, Illinois  

SciTech Connect

King field has produced over 4 million bbl of oil from the Mississippian Aux Vases Formation along a north-south-trending anticlinal structure 3 mi long and 1.5 mi wide. The porous and permeable quartz sandstone, which comprises the principal hydrocarbon reservoir, can grade laterally into nonporous calcareous sandstone, siltstone, shale, or limestone within one well location (660 ft). The Aux Vases Formation at King field was deposited in an intertidal to subtidal, mixed siliciclastic-carbonate environment, and the resulting mosaic of depositional facies significantly affects reservoirs continuity. Impermeable to only slightly permeable siltstones, shales, and limestones of the various offshore facies, and shales and siltstones of the tidal-flat facies separate the producing sandstones of a tidal channel-offshore bar facies into distinct reservoir compartments. This reservoir heterogeneity results in an oil-water contact at various depths across the field. Lateral compartmentalization of the reservoir has allowed large sections of the Aux Vases reservoir to remain unswept by waterflooding. Volumetric analyses suggest that untapped reservoir compartments may contain an additional 1-2 million bbl of oil recoverable by primary and waterflood methods.

Leetaru, H.E. (Illinois State Geological Survey, Champaign (United States))

1991-08-01

157

Ayuveda'S contribution to sports medicine.  

PubMed

Medical Science plays an important role in the field of Sports. Maintenance of fitness throughout the events, heightened physical and mental stamina are the basic needs of sportsmen. Here, the author attempts to find out the ways and means of utilizing the poten-tial of Ayurveda in the field of sports and its original contribution to sports medicine. PMID:22557655

Satpute, A D

1989-01-01

158

Coring Performance to Characterise the Geology in the ``Cran aux Iguanodons'' of Bernissart (Belgium)  

NASA Astrophysics Data System (ADS)

The Cran aux iguanodons of Bernissart is a sinkhole (or chimney caving) with a valuable paleontological deposit due to the exceptional quantity and diversity of fossils found during the excavation conducted from 1878 to 1881. In fact, bones have been discovered in a clayey geological formation when digging à mine gallery at the -322 m level. A subsequent extraction gave an overall production of 29 iguanodons skeletons. Referring to the available data at the Natural Sciences Museum of Brussels where the found skeletons are exhibited, one does not know the degree of depletion of the deposit after the extraction. A feasibility study (Tshibangu and Dagrain 1998) showed then the need to drill 4 exploration wells of 400 m depth with different objectives: to evaluate the chance of finding more fossils, understanding how and when the geological formations moved down, and testing a seismic geophysical technique for ground imaging. The typical geological formations concerned are: chalk, limestone, conglomerate, clays, and layers of silex nodules. In October 2002 the workings started with a completely cored well (the Number 3) using the PQ wireline technique. During operations, different parameters have been recorded: rate of penetration, core recovery and a brief core description. Some problems have been encountered when crossing silex stones contained in a clayey matrix; and this paper gives some interpretations in terms of the relationship between the lithology and the drilling performances.

Tshibangu, Jean-Pierre; Dagrain, Fabrice; Legrain, Hughes; Deschamps, Benoît

159

Perspectives of astroparticle physics  

NASA Astrophysics Data System (ADS)

After an introduction on Astroparticle Physics, I'll summarise the status of the main parameters of the Standard Cosmological Model (SCM). SCM points to the existence of cold dark matter, whose search I review in §4 in §6 we will see the contribution of SCM to our knowledge of neutrino masses, after having recalled the status of the new neutrino physics in §5. I'll then discuss the contributions to neutrino physics of the experiments on single and double beta decay experiments, on solar neutrinos and on Supernova neutrinos. Finally in §11 I'll discuss the ultra high energy cosmic rays, another hint for possible new physics.

Bettini, A.

2003-01-01

160

Physical activity - preventive medicine (image)  

MedlinePLUS

Physical activity contributes to health by reducing the heart rate, decreasing the risk for cardiovascular disease, and ... loss that is associated with age and osteoporosis. Physical activity also helps the body use calories more ...

161

Application du groupe de renormalisation aux conducteurs organiques quasi-unidimensionnels soumis a un champ magnetique  

NASA Astrophysics Data System (ADS)

Des conducteurs organiques fortement anisotropes presentent, sous l'effet d'un champ magnetique, une etonnante variete de proprietes physiques tel que: l'effet Shubnikov-de Haas, l'effet de Haas-van-Alphen, l'existence de cascades d'ondes de densite de spin apparentees a l'effet Hall quantique, reentrance vers la phase metallique pouvant provenir d'un 'breakdown' magnetique, et tout recemment la possibilite d'un confinement charge induit par le champ magnetique. A cela s'ajoute les nombreuses caracteristiques deja apparues en variant la pression hydrostatique ou la substitution chimique: separation spin-charge, localisation de la charge, transition spin-Peierls, antiferromagnetisme itinerant ou non, supraconductivite, et l'existence d'une frontiere commune entre les phases supraconductrice et antiferromagnetique. En vue de completer la description theorique du diagramme de phase generalise des conducteurs organiques, nous adaptons et elargissons la methode du groupe de renormalisation quantique (GRQ) au cas ou le champ magnetique est non nul. On sait deja que cette methode permet de resoudre le dilemme tout particulier des composes Q-1D, soit leur capacite de produire des transitions de phase malgre leur forte anisotropie et consequemment de leur faible dimensionalite. Cette methode est deja utilisee pour decrire le diagramme de phase temperature versus pression des sels de Bechgaard, de leurs analogues souffres et mixtes. Le GRQ permet aussi de comprendre comment des systemes anisotropes comme les conducteurs organiques peuvent se comporter comme des liquides de Luttinger a haute temperature et comme des liquides de Fermi ou condenses a basse temperature. Nous montrons que l'introduction d'un champ magnetique dans un regime de saut coherent interchai ne a deux particules n'apporte que de simples corrections aux lois d'echelles dans le canal zero son, alors qu'il introduit un mecanisme de brisure de paire dans le canal Cooper. Dans le regime de saut coherent a une particule, la situation est plus complexe puisque la structure de bande et la forme de la surface de Fermi deviennent pertinentes. Sous bon nesting, un champ magnetique le champ magnetique defavorise les phases magnetiques du type habituellement observe en champ nul. Nous obtenons en effet que leur temperature de transition diminue avec le champ magnetique. Sous deviations au nesting suffisant pour detruire l'ordre magnetique a champ nul, nous montrons que le nesting quantifie est compatible avec l'analyse du GRQ pour des champ faibles et intermediaires. Ainsi, le nesting quantifie fournit toujours une excellente base de description des cascades de phases d'onde de densite de spin induite en champ magnetique. D'autre part, l'utilisation du GRQ permet de mettre en evidence l'existence d'un regime de champ fort. Dans ce regime le mouvement coherent des electrons dans la direction transverse aux chai ne est fortement reduit. De cette reduction de la coherence transverse les regles de renormalisation 1D qui persistent a une temperature plus basse que dans les autres regimes. Ceci donne la possibilite d'atteindre grace au champ magnetique des etats de type localisation de charge et spin-Peierls qui sont habituellement observes, en champ nul, dans des composes ayant un caractere unidimensionnel beaucoup plus prononce.

Hubert, Laurent

162

Linear Collider Physics  

Microsoft Academic Search

We report on a study of the physics potential of linear $e^+e^-$ colliders. Although a linear collider (LC) would support a broad physics program, we focus on the contributions that could help elucidate the origin of electroweak symmetry breaking. Many extensions of the standard model have a decoupling limit, with a Higgs boson similar to the standard one and other,

Paul F. Derwent; Bogdan A. Dobrescu; Andreas S. Kronfeld; Heather E. Logan; Konstantin T. Matchev; Adam Para; David L. Rainwater; Slawomir Tkaczyk; William C. Wester III

2001-01-01

163

What Can Political Science Contribute to the Study of Criminal Justice in Canada?  

Microsoft Academic Search

Résumé: Cette étude présente l’argument que les politologues Canadiens se sont souvent intéressés aux questions criminologiques, mais que leur contribution n’est peu reconnue et qu’il y a place à plus d’échanges entre ces disciplines. Les recherches criminologiques en science politique indiquent que trois axes pourraient être développés. En premier lieu, les politologues ont une position avantageuse pour comprendre comment le

Troy Q. Riddell

2010-01-01

164

Prediction of vapor–liquid equilibrium in polymer solutions using a Peng–Robinson group contribution model 1 Paper presented at the International Conference on Applied Physical Chemistry, Warsaw, 13–15 November 1996. 1  

Microsoft Academic Search

The objective of this study is to extend the applicability of a Peng–Robinson group contribution method (PRASOG), which combines a zero pressure gE mixing rule for Peng–Robinson EOS with ASOG group contribution model, to polymer solutions. The solvent activities in polymer solutions have been predicted by PRASOG-FV which evaluates the gE from ASOG-FV proposed previously in order to predict the

K Tochigi; H Futakuchi; K Kojima

1998-01-01

165

Collider physics  

SciTech Connect

This past year our group participated in both the D0 experiment at Fermilab and the SDC experiment at the SSC. Most of our effort was concentrated on the D0 project, where we contributed as much manpower as possible to the commissioning of the detector in preparation for the coming collider run. Our SDC work consisted of the investigation of one of the candidate technologies for the forward calorimeter. On the D0 experiment, our primary responsibilities have been in the areas of electronics commissioning and in the establishment of triggers for the coming collider run. We have also actively participated in the physics studies and have contributed to the upgrade effort as much as time has permitted. Our group has also participated in the cosmic ray run and in the D0 test beam. In view of our contributions, James White was selected as a member of the D0 Trigger board, and Jay Wightman is being trained as one of the global experts'' who are responsible for keeping the detector operational during the run. In addition, Amber Boehnlein has played a major role in the Level-2 trigger commissioning. A more detailed description of these activities is given in this paper.

Not Available

1991-01-01

166

Ectopic Overexpression of an AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) Gene OsIAA4 in Rice Induces Morphological Changes and Reduces Responsiveness to Auxin  

PubMed Central

Auxin has pleiotropic effects on plant growth and development. AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) proteins are short-lived transcriptional regulators that mediate auxin responses through interaction with an auxin receptor, the F-box protein transport inhibitor response 1 (TIR1). Most functions of Aux/IAA proteins have been identified in Arabidopsis by studying the gain-of-function mutants in domain II. In this study, we isolated and identified an Aux/IAA protein gene from rice, OsIAA4, whose protein contains a dominant mutation-type domain II. OsIAA4 has very low expression in the entire life cycle of rice. OsIAA4-overexpressing rice plants show dwarfism, increased tiller angles, reduced gravity response, and are less sensitive to synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D).

Song, Yaling; Xu, Zeng-Fu

2013-01-01

167

EDITORIAL: Physics competitions Physics competitions  

NASA Astrophysics Data System (ADS)

This editorial opens the second special section on physics competitions in European Journal of Physics. In the first section last year, we asked for feedback on the idea of such a section and on the content of the articles. We received no answer whatsoever, which can be interpreted in two ways: the section is not interesting enough to raise motivation for feedback, or the reader is satisfied. Having no indication which scenario is the correct one, we are optimistic and favour the second. The section at hand contains three articles. Again, as last year, the organizer of the annual Olympiad reports on tasks and outcomes of this competition. The Olympiad took place in Merida, Mexico, and was by far the largest event with 316 contestants from 68 countries. Again, the predominance of Asian/Chinese students was manifest, showing how serious the training is taken by both their authorities and students. Unfortunately, the winners of the last International Young Physicists' Tournament (IYPT), the team from Korea, did not accept the offer to report on their prize-winning contribution. We are thankful that two students from Austria, who achieved second place with their team, took over and reported on the task which they presented in the finals of the competition. It connects the fields of sport and physics and explains a special move in skateboarding. The third contribution introduces a different competition, 'International Conference of Young Scientists'. On one hand, as in the Olympiad, it addresses individuals, not teams. On the other, as in the IYPT, students have several months to prepare and also the quality of the presentation is an important element of the judgment. In fact, this competition comes closer to real scientific research compared to the other events. Finally and again, we hope that this section will serve several purposes: To show the competitions as a very important tool in the support of gifted students. To raise awareness amongst university teachers, and to help bridge the gap between physics teaching at schools and university. To point out that the tasks in these competitions are often suitable for university labs and as exercises. For more information, please consult the following websites: Physics Olympiad: http://ipho.phy.ntnu.edu.tw IYPT: http://www.iypt.org/new ICYS: http://metal.elte.hu/~icys/

Jordens, H.; Mathelitsch, L.

2010-07-01

168

Preliminary paleogeographic reconstruction of the Illinois basin during deposition of the Mississippian Aux Vases Formation: Implications for hydrocarbon recovery  

SciTech Connect

Extensive outcrop investigation and selective subsurface study allow definition of Illinois basin paleogeography during deposition of the Mississippian (Valmeyeran-Meramecian) Aux Vases Formation. The results incorporate an integrated approach utilizing field observations and petrographic analysis, wireline logs, subsurface maps, and cores. The Aux Vases Formation depositional system has been determined to be composed of subtidal to intertidal facies. Depositional facies in outcrop are based on rock body geometries, sedimentary structure assemblages, paleocurrent analysis, paleontology of body and trace fossils, facies relationships, and petrography. Depositional facies determined from subsurface data are based on correlation of lithologic interpretations from wireline logs, sand body geometries form isopach maps, and petrography. Specific depositional facies observed in outcrop and core and inferred from wireline logs and isopach maps are offshore bars and tidal channel complexes, extensive subtidal to lower intertidal, ripple-laminated, fine-grained quartzose sandstone. Carbonate facies occur as subtidal grainstones at or near the base of a sequence, or as high energy deposits which have been tidally reworked. This depositional system produces reservoir heterogeneities that complicate efficient hydrocarbon recovery. This diverse facies architecture is modified by tectonic and diagenetic overprinting, further segregating potential producing zones. To significantly improve recovery efficiency, predictions regarding compartmentalization can be used prior to designing a drilling program, an infill drilling program, or an application of enhanced recovery techniques.

Cole, R.D. (Illinois State Geological Survey, Champaign (United States))

1991-03-01

169

Application of the New Decommissioning Regulation to the Nuclear Licensed Facilities (NLF) at Fontenay-aux-Roses's Nuclear Center (CEA)  

SciTech Connect

This abstract describes the application of the new decommissioning regulation on all Nuclear Licensed Facilities (NLF is to say INB in French) at Fontenay-aux-Roses's Center (CEA/FAR). The decommissioning process has been applied in six buildings which are out of the new nuclear perimeter proposed (buildings no 7, no 40, no 94, no 39, no 52/1 and no 32) and three buildings have been reorganized (no 54, no 91 and no 53 instead of no 40 and no 94) in order to increase the space for temporary nuclear waste disposal and to reduce the internal transports of nuclear waste on the site. The advantages are the safety and radioprotection improvements and a lower operating cost. A global safety file was written in 2002 and 2003 and was sent to the French Nuclear Authority on November 2003. The list of documents required is given in the paragraph I of this paper. The main goals were two ministerial decrees (one decree for each NLF) getting the authorization to modify the NLF perimeter and to carry out cleaning and dismantling activities leading to the whole decommissioning of all NLF. Some specific authorizations were necessary to carry out the dismantling program during the decommissioning procedure. They were delivered by the French Nuclear Safety Authority (FNSA) or with limited delegation by the General Executive Director (GED) on the CEA Fontenay-aux-Roses's Center, called internal authorization. Some partial dismantling or decontamination examples are given below: - evaporator for the radioactive liquid waste treatment station (building no 53): FNSA authorization: phase realised in 2002/2003. - disposal tanks for the radioactive liquid waste treatment station (building no 53) FNSA authorization: phase realised in 2004, - incinerator for the radioactive solid waste treatment station (building no 07): FNSA authorization: operation realised in 2004, - research equipments in the building no. 54 and building no. 91: internal authorization ; realised in 2005, - sample-taking to characterize solvent contained in one tank of Petrus installation (NLF 57, building 18) for radiological and chemical analysis needed to prepare the treatment and the evacuation of these wastes : internal authorization ; realised in june 2005. It was possible to plan the whole decommissioning process on the Nuclear Licensed Facilities of Fontenay-aux-Roses's Center (CEA/FAR) taking into account the French new regulation and to plan a coherent and continue program activity for the dismantling process. For the program not to be interrupted during the administrative process (2003-2006), specific authorisations have been delivered by the French Nuclear Safety Authority or by the General Executive Director (GED) on the CEA Fontenay-aux- Roses's Center (internal authorization). The time schedule to complete the entire program is until 2017 for NLF 'Procede' (NLF no 165) and until 2018 for NLF 'Support' (NLF no 166). Since 1999, an annual press meeting has been organised by the Fontenay-aux-Roses's Center Head Executive Manager.

Sauret, Josiane [Commissariat a l'Energie Atomique, Direction du Centre de Fontenay-aux-Roses, Cellule de Surete nucleaire, de controle des Matieres, de controle des Transports et de la Qualite, 18 route du Panorama BP 6 - 92265 Fontenay-aux-Roses Cedex (France); Piketty, Laurence; Jeanjacques, Michel [Commissariat a l'Energie Atomique, Direction de l'Energie Nucleaire, Direction deleguee des Activites Nucleaires de Saclay, Departement des Reacteurs et des Services Nucleaires, service d'Assainissement de Fontenay-aux-Roses, 18 route du Panorama BP 6 - 92265 Fontenay-aux-Roses Cedex (France)

2008-01-15

170

Research in Physical Chemistry and Chemical Education: Part A--Water Mediated Chemistry of Oxidized Atmospheric Compounds Part B--The Development of Surveying Tools to Determine How Effective Laboratory Experiments Contribute to Student Conceptual Understanding  

ERIC Educational Resources Information Center

|This dissertation is a combination of two research areas, experimental physical chemistry, Chapters I to V, and chemical education, Chapters VI to VII. Chapters I to V describe research on the water-mediated chemistry of oxidized atmospheric molecules and the impact that water has on the spectra of these environmental systems. The role of…

Maron, Marta Katarzyna

2011-01-01

171

Physical Abuse  

MedlinePLUS

Physical Abuse Physical abuse is physical force or violence that results in bodily injury, pain, or impairment. ... or clusters of indicators that suggest a problem. Physical indicators Sprains, dislocations, fractures, or broken bones Burns ...

172

Sports Physicals  

MedlinePLUS

... season is so important. What Is a Sports Physical? In the sports medicine field, the sports physical ... give answers you think your doctor wants. Continue Physical Examination During the physical part of the exam, ...

173

Physics and the communications industry  

Microsoft Academic Search

years, 1 tends to overshadow the dominant role that physics and physicists have played in its development.2,3 The purpose of this review is to explore this coupling and to show that the communications industry has not only made use of the results of academic physics research but has also contributed significantly to our present understanding of fundamental physics. Due to

W. F. Brinkman; D. V. Lang

1997-01-01

174

Satellite remote sensing in monitoring change of seabirds: use of Spot Image in king penguin population increase at Ile aux Cochons, Crozet Archipelago  

Microsoft Academic Search

The king penguin colony at Ile aux Cochons, Crozet Archipelago (southern Indian Ocean) is the largest in the world. The change in its surface area was investigated by means of satellite remote sensing using spot scene. The satellite picture enabled us to locate the colony and to determine that the surface area occupied by the colony has increased by 56%

Christophe Guinet; Pierre Jouventin; Jean Malacamp

1995-01-01

175

ERADICATION OF CROWN OF THORNS STARFISH (ACANTHASTER PLANCI) INFESTATION IN A PATCH REEF IN THE LAGOON OFF ILE AUX CERFS, MAURITIUS  

Microsoft Academic Search

The Crown of Thorns (COTs) starfish is a natural predator of live corals. It was observed in unusually high numbers in the patch reef between Ile aux Cerfs and the fringing reef. This paper describes how Crown of Thorns infestation was effectively controlled by injection of dry acid in situ through diving without any adverse effect on the marine environment

V Mangar

176

Observation par topographie aux rayons X des configurations de dislocations developpees a l'extremite d'une fissure dans le silicium  

Microsoft Academic Search

Des monocristaux de silicium, préfissurés à température ambiante, sont chargés en mode 1, à 800°C, la charge appliquée correspondant à un facteur d'intensité de constrainte KI < KIC. Les configurations de dislocations développées à l'extrémité de la fissure sont étudiées par topographie aux rayons X. Les dislocations sont contenues dans les plans {111} qui coupent le front de fissure. Dans

Par G. Michot; K. Badawi; A. R. Ab Del Halim; A. George

1980-01-01

177

Stueckelberg and Molecular Physics  

NASA Astrophysics Data System (ADS)

The first period of E. C. G. Stueckelberg's scientific career was marked by important contributions he made to molecular physics.1 After publishing his thesis in 1927 in Basel [1] Stueckelberg joined the prestigious Palmer Physical Laboratory in Princeton where he worked under the guidance of Karl Taylor Compton, brother of Arthur Holly Compton. Stueckelberg owed this position devoted several papers to problems of molecular physics. Stueckelberg had the benefit at Princeton of exchanges with other gifted members of the Palmer Physical Laboratory, Philip M. Morse and E. U. Condon among others.3 to a recommendation by A. Sommerfeld.2 In this stimulating environment, he devoted several papers to problems of molecular physics. Stueckelberg had the benefit at Princeton of exchanges with other gifted members of the Palmer Physical Laboratory, Philip M. Morse and E. U. Condon among others.3

Lacki, Jan

178

Diversification and Expression of the PIN, AUX/LAX, and ABCB Families of Putative Auxin Transporters in Populus  

PubMed Central

Intercellular transport of the plant hormone auxin is mediated by three families of membrane-bound protein carriers, with the PIN and ABCB families coding primarily for efflux proteins and the AUX/LAX family coding for influx proteins. In the last decade our understanding of gene and protein function for these transporters in Arabidopsis has expanded rapidly but very little is known about their role in woody plant development. Here we present a comprehensive account of all three families in the model woody species Populus, including chromosome distribution, protein structure, quantitative gene expression, and evolutionary relationships. The PIN and AUX/LAX gene families in Populus comprise 16 and 8 members respectively and show evidence for the retention of paralogs following a relatively recent whole genome duplication. There is also differential expression across tissues within many gene pairs. The ABCB family is previously undescribed in Populus and includes 20 members, showing a much deeper evolutionary history, including both tandem and whole genome duplication as well as probable gene loss. A striking number of these transporters are expressed in developing Populus stems and we suggest that evolutionary and structural relationships with known auxin transporters in Arabidopsis can point toward candidate genes for further study in Populus. This is especially important for the ABCBs, which is a large family and includes members in Arabidopsis that are able to transport other substrates in addition to auxin. Protein modeling, sequence alignment and expression data all point to ABCB1.1 as a likely auxin transport protein in Populus. Given that basipetal auxin flow through the cambial zone shapes the development of woody stems, it is important that we identify the full complement of genes involved in this process. This work should lay the foundation for studies targeting specific proteins for functional characterization and in situ localization.

Carraro, Nicola; Tisdale-Orr, Tracy Eizabeth; Clouse, Ronald Matthew; Knoller, Anne Sophie; Spicer, Rachel

2012-01-01

179

Physical Science  

NSDL National Science Digital Library

Physical science is the science of matter and energy and their interactions and examines the physical world around us. Using the methods of the physical sciences, students learn about the composition, structure, properties, and reactions of matter and the relationships between matter and energy. Students are best able to build understanding of the physical sciences through hands-on exploration of the physical world.

K-12 Outreach,

180

Linear Collider Physics  

Microsoft Academic Search

We report on a study of the physics potential of linear $e^+e^-$ colliders.\\u000aAlthough a linear collider (LC) would support a broad physics program, we focus\\u000aon the contributions that could help elucidate the origin of electroweak\\u000asymmetry breaking. Many extensions of the standard model have a decoupling\\u000alimit, with a Higgs boson similar to the standard one and other,

Paul F. Derwent; Bogdan A. Dobrescu; Andreas S. Kronfeld; Heather E. Logan; Konstantin T. Matchev; David L. Rainwater; William C. Wester; Slawomir Tkaczyk

2001-01-01

181

Physical Health  

MedlinePLUS

... Volunteer Search Email this page Print this page Physical health Tweet The physical recovery after transplant is a slow process. Your ... strength. A combination of eating well and some physical activity can help you feel better. Each person ...

182

Physics Formulary  

NSDL National Science Digital Library

Provided by physicist Johan Wevers and written at the undergraduate to postgraduate level, the Physics Formulary provides 108 pages of physics formulas. According to the authors, the Formulary âÂÂis intended to be a short reference for anyone who works with physics and often needs to look up equations.â The Formulary is available in a number of formats, including Adobe PDF, and presents formulas relating all major areas of physics including mechanics, electricity & magnetism, relativity, oscillations, waves, optics, statistical physics, thermodynamics, transport phenomena, quantum physics, plasma physics, solid state physics, theory of groups, nuclear physics, quantum field theory & particle physics, and astrophysics. This is a great resource for students and teachers of both introductory and advanced physics.

Wevers, Johan

2007-04-18

183

Appendix: Additional Contributions  

NASA Astrophysics Data System (ADS)

The number of contributions to the Symposium was so high that only the review and invited talks have found place, in the form of articles, in this volume. This Appendix lists all these additional contributions (oral and posters) which are not present as articles. The abstracts of all contributions were published in a booklet produced by the Local Organizing Committee and are available at the SAO/NASA Astrophysics Data System (ADS). More information on these contributions (PowerPoint presentations and/or articles) have been made public in the Internet web site of the conference (http://cab.inta-csic.es/molecular_universe/).

2011-12-01

184

Physics-Related Stamps  

NSDL National Science Digital Library

This page exhibits stamps displaying physicists, mathematicians, and engineers important in physics. The stamps are combined in 'albums' by the people who contributed the scans to the collection. Use the search function of your browser to look for a particular name.

Reinhardt, Joachim

2004-12-18

185

Semantic physical science  

PubMed Central

The articles in this special issue arise from a workshop and symposium held in January 2012 (Semantic Physical Science’). We invited people who shared our vision for the potential of the web to support chemical and related subjects. Other than the initial invitations, we have not exercised any control over the content of the contributed articles.

2012-01-01

186

Physical Education: Essential Issues  

ERIC Educational Resources Information Center

|This book is aimed primarily at under and postgraduate students pursuing entire programmes or discrete courses and modules in the broad area of physical education and sport in schools. It consists of a collection of what is considered to be essential readings in the sense that they are contributions from eminent authors on a breadth of salient…

Green, Ken, Ed.; Hardman, Ken, Ed.

2005-01-01

187

Student Blogging about Physics  

ERIC Educational Resources Information Center

|In traditional introductory physics classes, there is often limited opportunity for students to contribute their own ideas, interests, and experiences as they engage with the subject matter. This situation is exacerbated in university lecture-format classes, where students may not feel comfortable speaking during class. In the last few years,…

Daniels, Karen E.

2010-01-01

188

Hadron physics at LEP  

SciTech Connect

Recent contributions from LEP to the field of hadron spectroscopy are reviewed. Important results have come from three distinct classes of physics processes: inclusive meson and baryon production in hadronic Z{sup 0} decay; hadronic systems in {tau} lepton decay; and resonance formation in untagged {gamma}{gamma} collisions.

Lafferty, George D. [Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL (United Kingdom)

1998-05-29

189

Afterglow Physics  

NASA Astrophysics Data System (ADS)

I review the development of the relativistic blast-wave model for GRB afterglows, in which the delayed emission is synchrotron and, possibly, inverse Compton from electrons accelerated by the forward shock that energizes the burst ambient medium or the reverse shock that crosses the incoming ejecta. This model is tested and its features constrained using afterglow observations at radio, optical, X-ray, and GeV photon energies. Modeling of the afterglow broadband emission allows the determination of the outflow's physical parameters, such as collimation and energetics, circum-burst medium density, its radial stratification, and of forward-shock microphysical parameters. The slowly-decaying radio afterglows (weeks after trigger) and the fast-decaying early optical afterglows (up to 1 ks) provide evidence for a temporary contribution from the reverse-shock. The chromatic X-ray light-curve breaks and the afterglows with well-coupled optical and X-ray light-curves and chromatic breaks suggest the existence of an outflow inner to the blast-wave, which bulk-scatters the forward-shock emission and injects energy into it.

Panaitescu, A.

2010-10-01

190

Physical Education  

NSDL National Science Digital Library

Physical education is important to children and their developing bodies, both physical and mental. All children should get up off the couch and do some type of physical education. Students will understand and apply the health-enhancing benefits of physical activity and proper nutrition. Being healthy in physical activity and eating the right foods boost your ability to have fun and feel good about yourself. The President\\'s Council on Physical Fitness and Sports program is a great way to kids to get started at getting physically fit. They have listed their top 10 tips ...

Cherry, Mr.

2008-10-06

191

Physics Limericks  

NSDL National Science Digital Library

On a light note, the American Physical Society (APS) maintains this Website, dedicated entirely to physics limericks. At APS site, visitors can access an archive of all submitted limericks and a more specific list of the winning limericks of APS's First Physics Limerick Contest. Besides showing that physics is fun, most of the physics limericks are focused on a specific concept and would work well in undergraduate physics courses. If users are feeling creative, they may also submit physics limericks through an online form.

192

Radiation Oncology Physics and Medical Physics Education  

NASA Astrophysics Data System (ADS)

Medical physics, an applied field of physics, is the applications of physics in medicine. Medical physicists are essential professionals in contemporary healthcare, contributing primarily to the diagnosis and treatment of diseases through numerous inventions, advances, and improvements in medical imaging and cancer treatment. Clinical service, research, and teaching by medical physicists benefits thousands of patients and other individuals every day. This talk will cover three main topics. First, exciting current research and development areas in the medical physics sub-specialty of radiation oncology physics will be described, including advanced oncology imaging for treatment simulation, image-guided radiation therapy, and biologically-optimized radiation treatment. Challenges in patient safety in high-technology radiation treatments will be briefly reviewed. Second, the educational path to becoming a medical physicist will be reviewed, including undergraduate foundations, graduate training, residency, board certification, and career opportunities. Third, I will introduce the American Association of Physicists in Medicine (AAPM), which is the professional society that represents, advocates, and advances the field of medical physics (www.aapm.org).

Bourland, Dan

2011-10-01

193

Les immigrants tres scolarises obtiennent-ils des resultats differents sur le marche du travail au Canada et aux Etats-Unis?  

Microsoft Academic Search

On compare dans le present document les changements dans les salaires des nouveaux travailleurs immigrants titulaires d'un diplome universitaire au Canada et aux Etats-Unis au cours de la periode allant de 1980 a 2005 a ceux de leurs homologues nes au pays et a ceux des diplomes d'etudes secondaires (avantage salarial du diplome universitaire). Les salaires des nouveaux immigrants de

Aneta Hou Feng Picot Garnett Bonikowska

2011-01-01

194

Phenotypes associated with down-regulation of Sl-IAA27 support functional diversity among Aux/IAA family members in tomato.  

PubMed

The phytohormone auxin is known to regulate several aspects of plant development, and Aux/IAA transcription factors play a pivotal role in auxin signaling. To extend our understanding of the multiple functions of Aux/IAAs further, the present study describes the functional characterization of Sl-IAA27, a member of the tomato Aux/IAA gene family. Sl-IAA27 displays a distinct behavior compared with most Aux/IAA genes regarding the regulation of its expression by auxin, and the Sl-IAA27-encoded protein harbors a unique motif of unknown function also present in Sl-IAA9 and remarkably conserved in monocot and dicot species. Tomato transgenic plants underexpressing the Sl-IAA27 gene revealed multiple phenotypes related to vegetative and reproductive growth. Silencing of Sl-IAA27 results in higher auxin sensitivity, altered root development and reduced Chl content in leaves. Both ovule and pollen display a dramatic loss of fertility in Sl-IAA27 down-regulated lines, and the internal anatomy of the flower and the fruit are modified, with an enlarged placenta in smaller fruits. In line with the reduced Chl content in Sl-IAA27 RNA interference (RNAi) leaves, genes involved in Chl synthesis display lower expression at the level of transcript accumulation. Even though Sl-IAA27 is closely related to Sl-IAA9 in terms of sequence homology and the encoded proteins share common structural features, the data indicate that the two genes regulate tomato fruit initiation and development in a distinct manner. PMID:22764281

Bassa, Carole; Mila, Isabelle; Bouzayen, Mondher; Audran-Delalande, Corinne

2012-07-03

195

Isoelectronically substituted heavy-fermion compounds CeCu6-xAux , studied by local probe and electronic band structure calculation  

Microsoft Academic Search

For CeCu6-xAux (x=0,0.1,1) , we measured the temperature dependence of Cu63,65 nuclear magnetic resonance spectra of oriented single-crystal powder at 7T in the 5-100K range. Ce3+ crystal field and molecular field parameters are derived from single-crystal magnetic susceptibility data. Calculated electric field gradients are used to correctly assign nuclear quadrupole resonance frequencies to lattice sites (n) . Bare Knight shifts

M. Winkelmann; G. Fischer; B. Pilawa; M. S. S. Brooks; E. Dormann

2006-01-01

196

Observation of linear to planar structural transition in sulfur-doped gold clusters: Au(x)S- (x = 2-5).  

PubMed

We report a joint experimental and theoretical study on the structures of a series of gold clusters doped with a sulfur atom, Au(x)S(-) (x = 2-5). Well-resolved photoelectron spectra are obtained and compared with theoretical results calculated using several density functional methods to elucidate the structures and bonding of Au(x)S(-) (x = 2-5). Au2S(-) is found to have an asymmetric linear global minimum structure with C(?v) symmetry, while the most stable structure of neutral Au2S is bent with C(2v) symmetry, reminiscent of H2S. Au3S(-) is found to have an asymmetric bent structure with an Au-S-Au-Au connectivity. Two isomers are observed experimentally to co-exist for Au4S(-): a symmetric bent 1D structure (C(2v)) and a 2D planar low-lying isomer (C(s)). The global minimum of Au5S(-) is found to be a highly stable planar triangular structure (C(2v)). Thus, a 1D-to-2D structural transition is observed in the Au(x)S(-) clusters as a function of x at x = 4. Molecular orbital analyses are carried out to obtain insight into the nature of the chemical bonding in the S-doped gold clusters. Strong covalent bonding between S and Au is found to be responsible for the 1D structures of Au(x)S(-) (x = 2-4), whereas delocalized Au-Au interactions favor the 2D planar structure for the larger Au5S(-) cluster. PMID:23656130

Wen, Hui; Liu, Yi-Rong; Huang, Teng; Xu, Kang-Ming; Zhang, Wei-Jun; Huang, Wei; Wang, Lai-Sheng

2013-05-01

197

Minority Contributions to Science, Engineering, and Medicine.  

ERIC Educational Resources Information Center

Offering an historical perspective on the development of science, engineering, medicine, and technology and providing current role models for minority students, the bulletin lists the outstanding contributions made by: (1) Blacks - medicine, chemistry, architecture, engineering, physics, biology, and exploration; (2) Hispanos - biomedical…

Funches, Peggy; And Others

198

Engineering contributions to the life sciences  

Microsoft Academic Search

This paper discusses the contributions that physicians have made to the physical sciences. Some of the physicians mentioned by the author are William Gilbert who gave the first accurate treatise on magnetism, Thomas Young who gave us Young's modulus was also the first to discover the interference of light waves, Luigi Galvani who started the study on current electricity and

L. A. Geddes

2006-01-01

199

Minority Contributions to Science, Engineering, and Medicine.  

ERIC Educational Resources Information Center

|Offering an historical perspective on the development of science, engineering, medicine, and technology and providing current role models for minority students, the bulletin lists the outstanding contributions made by: (1) Blacks - medicine, chemistry, architecture, engineering, physics, biology, and exploration; (2) Hispanos - biomedical…

Funches, Peggy; And Others

200

Environmental and auxin regulation of wood formation involves members of the Aux/IAA gene family in hybrid aspen.  

PubMed

Indole acetic acid (IAA/auxin) profoundly affects wood formation but the molecular mechanism of auxin action in this process remains poorly understood. We have cloned cDNAs for eight members of the Aux/IAA gene family from hybrid aspen (Populus tremula L. x Populus tremuloides Michx.) that encode potential mediators of the auxin signal transduction pathway. These genes designated as PttIAA1-PttIAA8 are auxin inducible but differ in their requirement of de novo protein synthesis for auxin induction. The auxin induction of the PttIAA genes is also developmentally controlled as evidenced by the loss of their auxin inducibility during leaf maturation. The PttIAA genes are differentially expressed in the cell types of a developmental gradient comprising the wood-forming tissues. Interestingly, the expression of the PttIAA genes is downregulated during transition of the active cambium into dormancy, a process in which meristematic cells of the cambium lose their sensitivity to auxin. Auxin-regulated developmental reprogramming of wood formation during the induction of tension wood is accompanied by changes in the expression of PttIAA genes. The distinct tissue-specific expression patterns of the auxin inducible PttIAA genes in the cambial region together with the change in expression during dormancy transition and tension wood formation suggest a role for these genes in mediating cambial responses to auxin and xylem development. PMID:12220260

Moyle, Richard; Schrader, Jarmo; Stenberg, Anneli; Olsson, Olof; Saxena, Sangeeta; Sandberg, Göran; Bhalerao, Rishikesh P

2002-09-01

201

Comparative Performance of the RapID Yeast Plus System and the API 20C AUX Clinical Yeast System  

PubMed Central

The performance of the RapID Yeast Plus System (Innovative Diagnostic Systems, Norcross, Ga.), a 4-h micropanel using single-substrate enzymatic test reactions, was compared with that of the API 20C AUX Clinical Yeast System (bioMerieux Vitek, Hazelwood, Mo.), a 48- to 72-h carbohydrate assimilation panel. Two hundred twenty-five yeasts, yeast-like fungi, and algae, comprising 28 species and including 30 isolates of Cryptococcus neoformans, an important pathogen not tested in appreciable numbers in other comparisons, were tested by both methods. On initial testing, 196 (87.1%) and 215 (95.6%) isolates were correctly identified by the RapID and API systems, respectively. Upon repeat testing, the number of correctly identified isolates increased to 220 (97.8%) for the RapID system and 223 (99.1%) for the API system. Reducing the turbidity of the test inoculum to that of a no. 3 McFarland turbidity standard, which is below that recommended by the manufacturer, resulted in the correct identification of most of the isolates initially misidentified by the RapID system, including 10 of 30 C. neoformans isolates. Concordance between the RapID and API results after repeat testing was 97.3%.

Smith, Michael B.; Dunklee, Daisy; Vu, Hangna; Woods, Gail L.

1999-01-01

202

Physics Notes  

ERIC Educational Resources Information Center

Seventeen experiments in physics are described to demonstrate various physical phenomena. These include the areas of velocity of sound, damped oscillations, plastic deformation of wires, materials, testing, air resistance, spectrum optical filtering, and some new improvised apparatus. (PS)

School Science Review, 1972

1972-01-01

203

Sports Physicals  

MedlinePLUS

... baseball, football, or basketball. What Happens During a Sports Physical There are two main parts to a ... which they can participate. Where to Get a Sports Physical Some older kids may be able to ...

204

Physical activity  

MedlinePLUS

Physical activity -- which includes an active lifestyle and routine exercise -- plus eating well, is the best way ... shortness of breath when you are active Build physical activity into your regular routine Simple lifestyle changes ...

205

Physical Activity  

MedlinePLUS

... Lung Cancer > Treating Lung Cancer > A Life Change Physical Activity Regular exercise is part of a healthy ... body and not over exert yourself. Even light physical activity, like walking or stretching, can make you ...

206

Tevatron physics  

SciTech Connect

These lectures form a personal, and not necessarily comprehensive, survey of physics at the Fermilab Tevatron proton-antiproton collider. They cover detectors, analysis issues, and physics prospects for the current Tevatron run.

John Womersley

2003-01-03

207

Physical Therapy  

Microsoft Academic Search

\\u000a Physical therapists diagnose and manage conditions that cause movement dysfunction which affect an individual’s physical and\\u000a functional ability. They work toward restoring, maintaining, and promoting not only optimal physical function, but optimal\\u000a wellness, fitness, and quality of life as it relates to movement and health. Physical therapists provide interventions which\\u000a prevent the onset and progression of impairments, activity limitations, and

Victoria Marchese; Kripa Dholakia; Lori Brake

208

Cosmic physics  

Microsoft Academic Search

Classical physics is determined by the scale on which matter can be handled in everyday use; quantum physics results from the study of the interaction of matter on this scale with matter on smaller scales; cosmic physics is the study of matter on much greater scales, and there are many properties of matter that are observable and significant only on

W H McCrea

1968-01-01

209

Particle Physics  

Microsoft Academic Search

A few years ago, when some of us were working to introduce particle physics into A-level courses, I exchanged letters with a professor of particle physics who expressed the view that we would not succeed in our aims, on the grounds that there were no textbooks that treated particle physics at an appropriate level. Our opinion at the time was

E Swinbank

1998-01-01

210

SPS Internship: Working With Physics To Go  

Microsoft Academic Search

The Physics To Go website (www.physicstogo.com) is one of many collections of ComPADRE, an online library of electronic resources devoted to physics and astronomy education, funded by the National Science Foundation. Physics To Go, produced by the American Physical Society (APS), is a collection focused on informal physics learning, targeted towards self-motivated learners and the general public. My contributions to

Logan Hancock

2008-01-01

211

Physical activity levels during Dutch primary and secondary school physical education  

Microsoft Academic Search

Objective: Physical education (PE) has been attributed an important role in providing young people with physical activity. If sufficiently active, PE lessons could contribute to physical activity levels in youth. Therefore, the purpose of this study was to determine the overall intensity of Dutch primary and secondary school physical education (PE) lessons and the influence of various lesson characteristics on

Menno Slingerland; Joost Oomen; Lars Borghouts

2011-01-01

212

EDITORIAL: Physics competitions Physics competitions  

Microsoft Academic Search

1. Physics competitions: aims and realizations One aim of physics competitions is to increase the interest of young students, primarily at upper secondary level, to physics and natural sciences in general. A competition has motivational aspects known usually from sports events or games---comparing one's own ability with others, of course with the desire to be better and to win. If

H. Jordens; L. Mathelitsch

2009-01-01

213

Physics and complexity  

PubMed Central

This paper is concerned with complex macroscopic behaviour arising in many-body systems through the combinations of competitive interactions and disorder, even with simple ingredients at the microscopic level. It attempts to indicate and illustrate the richness that has arisen, in conceptual understanding, in methodology and in application, across a large range of scientific disciplines, together with a hint of some of the further opportunities that remain to be tapped. In doing so, it takes the perspective of physics and tries to show, albeit rather briefly, how physics has contributed and been stimulated.

Sherrington, David

2010-01-01

214

Vestibular contributions to bodily awareness.  

PubMed

The vestibular system has widespread interactions with multisensory cortical networks, including the somatosensory areas. Several clinical observations suggested that vestibular signals are essential to compute more abstract cognitive representations of the body. However, the existing literature is generally based on isolated reports. We aimed to provide both a theoretical framework, and an experimental method to investigate potential vestibular contributions to somatic cognition. Accordingly, we have investigated effects of galvanic vestibular stimulation (GVS) on the localisation of a stimulus on the skin of the hand (a process that we define as somatoperception) and on the implicit representation of the hand size and shape (involving a different process which we define as somatorepresentation). Vestibular input influenced the localisation of tactile stimuli on the hand: touches on the dorsum of the hand were perceived as shifted toward the wrist. The specific polarity of vestibular stimulation influences the localisation errors. Right anodal and left cathodal, which influences both cerebral hemispheres, induced a stronger localisation bias compared to left anodal and right cathodal GVS, which influences primarily the right hemisphere. Although our data confirmed previous findings that the body model of the shape of the hand is massively distorted, vestibular inputs do not contribute to these distortions. Our results suggest that vestibular input influences the registration of somatosensory input onto a map of the body (somatoperception), but does not influence stored knowledge about the spatial organisation of the body as a physical object (somatorepresentation). PMID:23624312

Ferrè, Elisa Raffaella; Vagnoni, Eleonora; Haggard, Patrick

2013-04-25

215

Incoherent scatter radar contributions  

NASA Astrophysics Data System (ADS)

The contributions of the incoherent scatter radar technique to knowledge of the neutral upper atmosphere of the earth in general and the development of the CIRA 1986 model in particular are discussed. Incoherent radar scattering involves the transmission of a radio wave into the atmosphere and the reception of the energy scattered by the free electrons illuminated by the wave. Attention is given to the chronology of radar contributions to the development of upper atmosphere models, the ion energy balance and continuity equations, exospheric temperatures, and studies of the lower thermosphere.

Oliver, W. L.; Alcayde, D.; Bauer, P.

216

The contribution by Domenico Pacini to the Cosmic Ray Physics  

NASA Astrophysics Data System (ADS)

Between 1900 and 1913 several people were investigating about the unknown radiation, later identified as Cosmic Rays. Several experimentalist tried to identify the origin of this radiation and in particular Victor Franz Hess, Theodor Wulf and Domenico Pacini. Among them Domenico Pacini had a crucial role to address the answer to the origin of this radiation in the right way, and V.F. Hess performed the complete set of measurements that definitively excluded an origin connected to the soil radioactive elements. However the most interesting and may be surprising point it that these pioneers defined 1 century ago the three experimental lines to study the Cosmic Rays: from space, on ground and underground and using only electroscopes. Domenico Pacini in particular may be considered the pioneer of the underground measurements on Cosmic Rays and Hess with his set of systematic measurements with balloon flights, originated the air-space studies on Cosmic Rays.

Giglietto, N.

2011-03-01

217

Bullying: Proactive Physical Educators' Contribution to School-Wide Prevention  

ERIC Educational Resources Information Center

|Although not a new concept, bullying continues to be a problem in schools across the nation. Bullying involves the intention to hurt the feelings of the victim. Research demonstrates that victims of bullying often experience low self-esteem, depression, anxiety, insecurity, oversensitivity, introversion, and withdrawal from social activities.…

Gibbone, Anne; Manson, Mara

2010-01-01

218

Bullying: Proactive Physical Educators' Contribution to School-Wide Prevention  

ERIC Educational Resources Information Center

Although not a new concept, bullying continues to be a problem in schools across the nation. Bullying involves the intention to hurt the feelings of the victim. Research demonstrates that victims of bullying often experience low self-esteem, depression, anxiety, insecurity, oversensitivity, introversion, and withdrawal from social activities. This…

Gibbone, Anne; Manson, Mara

2010-01-01

219

Could Applied Physics and Industry contribute to Increase of GDP?  

NASA Astrophysics Data System (ADS)

It is explained that the accentuation on the agriculture could not increase significantly the GDP/capita in the Republic of Moldova, while the revival of the branches of industry, which were developed in the former Moldavian S.S.R., such as microelectronics, hidropumping will increase singnificantly the GDP.

Gaina, Alex

2006-11-01

220

Lightning Physics and Effects  

NASA Astrophysics Data System (ADS)

Lightning Physics and Effects is not a lightning book; it is a lightning encyclopedia. Rarely in the history of science has one contribution covered a subject with such depth and thoroughness as to set the enduring standard for years, perhaps even decades, to come. This contribution covers all aspects of lightning, including lightning physics, lightning protection, and the interaction of lightning with a variety of objects and systems as well as the environment. The style of writing is well within the ability of the technical non-expert and anyone interested in lightning and its effects. Potential readers will include physicists; engineers working in the power industry, communications, computer, and aviation industries; atmospheric scientists; geophysicists; meteorologists; atmospheric chemists; foresters; ecologists; physicians working in the area of electrical trauma; and, lastly, architects. This comprehensive reference volume contains over 300 illustrations, 70 tables with quantitative information, and over 6000 reference and bibliography entries.

Orville, Richard E.

2004-03-01

221

Physics Today  

NSDL National Science Digital Library

Physics Today is a monthly journal of the American Institute of Physics that has been in circulation for 50 years. Now Physics today is available free online. Lively news and reviews, the latest discoveries,, and a forum for discussion of current issues in physics make up the journal. this month's special focus is on the centennial anniversary of NIST (the National Institute of Standards and Technology) with articles on the physics of atomic clocks, determination of fundamental constants, and more. Letters, book reviews, job and meeting announcements, and new product listings are also presented. The site states that, in the near future, access restrictions will apply and certain services will be available only to subscribers and individual members of societies connected to the American Institute of Physics.

2001-01-01

222

Neutrino physics  

SciTech Connect

The field of neutrino physics has expanded greatly in recent years with the discovery that neutrinos change flavor and therefore have mass. Although there are many neutrino physics results since the last DIS workshop, these proceedings concentrate on recent neutrino physics results that either add to or depend on the understanding of Deep Inelastic Scattering. They also describe the short and longer term future of neutrino DIS experiments.

Harris, Deborah A.; /Fermilab

2008-09-01

223

Animation Physics  

NSDL National Science Digital Library

This web site provides physics tutorials and other resources for animation artists and professionals working in the animation industry. There are three tutorials covering topics related to the graphical representation of linear and accelerated motion, rotations, and center of mass. The presentation is non-mathematical and focuses on the consequences of the laws of physics. The web site also provides other physics references for animators and has started a wiki for community building.

Garcia, Alejandro

2009-04-02

224

Can Decentralization Contribute to \\  

Microsoft Academic Search

Decentralization is one of the essential institutional reform efforts pursued in developing countries. It is intended to contribute to further democratization, to more effective development, and to good governance. The experiences in Uganda's decentralization efforts inform us that decentralization is a long-term learning process for various stakeholders, whose views are not necessarily congruent over the process. On the one hand,

Fumihiko SAITO

225

Contributions of Henrik Lundegårdh  

Microsoft Academic Search

Henrik Lundegårdh made major contributions in the field of ecology and plant physiology from 1912 to 1969. His early work at Hallands Väderö in the Kattegat pioneered quantitative approaches to plant ecology and laid the understanding of carbon dioxide exchange in natural communities which is still useful today in global carbon accounting. Very early on in this work he invented

Anthony William; Derek Larkum

2003-01-01

226

B Physics at the LHC  

SciTech Connect

The LHC is scheduled to start its first physics data taking period later in 2009. Primarily LHCb but also ATLAS and CMS will start a rich B physics programme with the potential of revealing New Physics in the heavy flavour sector. This contribution will cover the prospects for B physics at the LHC with particular emphasis to early measurements. This includes CP violation measurements in B{sub d}{sup 0} and B{sub s}{sup 0} decays, searches for rare decays such as B{sub s}{sup 0}->{mu}{mu}, as well as semileptonic and radiative channels.

Gersabeck, Marco [Department of Physics and Astronomy, University of Glasgow (United Kingdom)

2010-02-10

227

Physics Education Technology: Interactive Physics Simulations  

NSDL National Science Digital Library

This collection of interactive, research-based simulations introduces students to basic physical phenomena. The simulations cover a variety of topics: motion, sound, and waves; light and radiation; electricity, magnets, and circuits; chemistry; and many others. The simulations can be run from the web site or downloaded for later use, and are accompanied by a collection of lessons and activities that use them. There is also information on how to download and run the simulations and links to publications about the project and studies of the effectiveness of the simulations in teaching. Educators are also invited to contribute ideas for lesson or activities that use the simulations.

228

“A Waste of Time”: Hispanic Women's Attitudes Toward Physical Activity  

Microsoft Academic Search

Despite a lack of studies on Hispanic midlife women's physical activity, the existing studies have indicated that Hispanics' ethnic-specific attitudes toward physical activity contributed to their lack of physical activity. However, little is still clearly known about Hispanic midlife women's attitudes toward physical activity. The purpose of this study was to explore Hispanic midlife women's attitudes toward physical activity using

Eun-Ok Im; Bokim Lee; Hyenam Hwang; Kyung Hee Yoo; Wonshik Chee; Alexa Stuifbergen; Lorraine Walker; Adama Brown; Chelsea McPeek; Michelle Miro; Eunice Chee

2010-01-01

229

How Do Education Students Learn Physics?  

ERIC Educational Resources Information Center

Research in physics education has identified students' attitudes and beliefs that contribute to higher gains in learning. The study investigated the extent of change in education majors' attitudes, beliefs and cognitive expectations after going through an introductory physics course. Using the MPEX (Maryland Physics Expectations) Survey and the…

Mistades, Voltaire Mallari

2011-01-01

230

Comprendre les representations du personnel soignant face aux infections nosocomiales au Clostridium difficile au Quebec pour mieux en promouvoir la sante.  

PubMed

Au cours des dernières années, la transmission des infections nosocomiales, notamment des infections à Clostridium difficile, est devenue une importante préoccupation au Québec. Pour éviter leur transmission, les experts recommandent notamment la formation du personnel. Dans cet article, nous décrivons la représentation que se font certaines catégories de personnel de la santé à propos des risques reliés à la transmission du Clostridium difficile et leur perception des messages de prévention, afin d'identifier des avenues permettant de contribuer à cette formation. Nous avons effectué 27 entrevues et 186 heures d'observation auprès d'infirmières, infirmières auxiliaires, préposés aux bénéficiaires et préposés à l'entretien sanitaire expérimentés, dans deux unités de soins de courte durée et deux de longue durée d'un hôpital à Montréal. Résultats : le personnel se préoccupe de la transmission du C difficile envers les patients et envers leurs propres familles davantage que des conséquences immédiates sur leur propre santé. Les pratiques pour éviter de transporter le microorganisme à leur maison sont décrites. Malgré l'application de mesures de prévention, certains participants pensent s'être contaminés et être porteurs sains du C difficile, qui persisterait dans leur organisme et pourrait s'activer s'ils sont affaiblis ou sous antibiotiques. Cette contamination surviendrait à cause de situations mettant en échec la prévention : les patients non diagnostiqués et les délais de diagnostic, un manque de formation sur les mesures de prévention et sur les mesures pratiques pour les appliquer et un manque d'information sur les produits désinfectants, ces deux dernières mesures affectant surtout les préposées aux bénéficiaires. Nous concluons sur la nécessité de prendre en compte les préoccupations du personnel dans les interventions éducatives ; de formations pratiques, adaptées au travail et sur le besoin d'information quant aux raisons de changements de produits. PMID:23986384

Seifert, Ana María; O'Neill, Michel

2013-09-01

231

Physics Notes.  

ERIC Educational Resources Information Center

Describes equipment, activities, and experiments useful in physics instruction, including among others, a list of articles relating to physics topics, computer interface that makes a computer cost effective, use of a guitar in vibrating string experiments, and photoelectric aids to the measurement of distance, speed, velocity, and acceleration.…

School Science Review, 1980

1980-01-01

232

Plasma Physics  

Microsoft Academic Search

Beginning at an introductory level, this text presents a thorough treatment of plasma physics, including an extensive discussion of its applications in thermonuclear fusion research. A novel feature of this book is its comprehensive description of the various concepts and formulas widely used in fusion theory based on the fundamental equations of the plasma fluid. The physics of fusion plasmas

Kyoji Nishikawa; Masashiro Wakatani

1990-01-01

233

Climate Physics  

ERIC Educational Resources Information Center

|Numerous connections exist between climate science and topics normally covered in physics and physical science courses. For instance, lessons on heat and light can be used to introduce basic climate science, and the study of electric circuits provides a context for studying the relationship between electricity consumption and carbon pollution. To…

Space, William

2007-01-01

234

Thermal Physics  

Microsoft Academic Search

I read this book with great interest since so many standard and good textbooks already exist within statistical and thermal physics that I expected to find an answer to the main question: why should one more book be published and for whom? This branch of knowledge (particularly, the physics at thermal equilibrium which constitutes the main part of this book)

R Kutner

2000-01-01

235

Complete Physics  

Microsoft Academic Search

This book contains all the essential concepts for GCSE (or equivalent) physics courses or for general science courses at Key Stage 4. It claims to be ideal for use as a bridging resource for those intending to take physics beyond GCSE: it is no surprise, then, that the book is written at a level above that of the average Key

Simon Carson

2000-01-01

236

GCSE Physics  

Microsoft Academic Search

The number of CD-ROMs for science revision at GCSE seems to be growing at some pace, and this latest addition offers a `complete revision guide' to the physics component of dual award science. The disc uses the idea of the `Ultimate Staffroom' to take student through the main topics of physics. The staffroom contains Joule, Faraday, Newton, Rutherford and Einstein

J J Wellington

1998-01-01

237

CONTRIBUTIONS REGARDING THE MANAGEMENT OF THE EFFECTS OF GLOBAL WARMING  

Microsoft Academic Search

The paper contains analyses about the effects of global warming and climate change. The impacts of climate change may be physical,ecological, social or economic. Evidence of observed climate change includes the increasing temperature, CO2 emissions, droughts, floods, etc. Human activities have contributed to a number of the observed changes in climate. This contribution has principally been through the burning of

Gabriela PRELIPCEAN; Angela Cozorici; Mariana LUPAN

2011-01-01

238

Abstracts of contributed papers  

SciTech Connect

This volume contains 571 abstracts of contributed papers to be presented during the Twelfth US National Congress of Applied Mechanics. Abstracts are arranged in the order in which they fall in the program -- the main sessions are listed chronologically in the Table of Contents. The Author Index is in alphabetical order and lists each paper number (matching the schedule in the Final Program) with its corresponding page number in the book.

Not Available

1994-08-01

239

Contributions of Henrik Lundegårdh  

Microsoft Academic Search

Henrik Lundegårdh made major contributions in the field of ecology and plant physiology from 1912 to 1969. His early work\\u000a at Hallands Väderö in the Kattegat pioneered quantitative approaches to plant ecology and laid the understanding of carbon\\u000a dioxide exchange in natural communities which is still useful today in global carbon accounting. Very early on in this work\\u000a he invented

Anthony William Derek Larkum; Derek Larkum

2003-01-01

240

Collins Mechanism Contributions to Single Spin Asymmetry  

SciTech Connect

We present recent developments on the single transverse spin physics, in particular, the Collins mechanism contributions in various hadronic reactions, such as semi-inclusive hadron production in DIS process, azimuthal distribution of hadron in high energy jet in pp collisions. We will demonstrate that the transverse momentum dependent and collinear factorization approaches are consistent with each other in the description of the Collins effects in the semi-inclusive hadron production in DIS process.

Yuan Feng [Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 and RIKEN/BNL Research Center, Building 510A, Brookhaven National Laboratory, Upton, NY 11973 (United States)

2009-12-17

241

Collins Mechanism Contributions to Single Spin Asymmetry  

SciTech Connect

We present recent developments on the single transverse spin physics,in particular, the Collins mechanism contributions in various hadronic reactions,such as semi-inclusive hadron production in DIS process, azimuthal distributionof hadron in high energy jet in pp collisions. We will demonstrate thatthe transverse momentum dependent and collinear factorization approaches areconsistentwith each other in the description of the Collins effects in the semi-inclusivehadron production in DIS process.

Yuan, Feng

2009-09-11

242

Turkic Contributions To The CLIC Project  

SciTech Connect

Turkic group has been a collaborator of CLIC project of CERN since mid-2004. Since then, the group has been contributing CLIC study efforts on: impact of beam dynamics issues on CLIC Physics potential, CLIC*LHC interface (QCD Explorer, ep, {gamma}p, eA and {gamma}A colliding options and FEL {gamma} Nucleus Collider) and operation of CTF3. On this talk the status of the collaboration is given in details.

Ciftci, A. K. [Physics Department, Faculty of Sciences, Ankara University, 06100 Tandogan, Ankara (Turkey)

2007-04-23

243

Scalar field oscillations contributing to dark energy  

SciTech Connect

We use action-angle variables to describe the basic physics of coherent scalar field oscillations in the expanding universe. These analytical mechanics methods have some advantages, like the identification of adiabatic invariants. As an application, we show some instances of potentials leading to equations of state with p<-{rho}/3, thus contributing to the dark energy that causes the observed acceleration of the universe.

Masso, Eduard; Rota, Francesc; Zsembinszki, Gabriel [Grup de Fisica Teorica and Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona 08193 Bellaterra, Barcelona (Spain)

2005-10-15

244

Some Calculable Contributions to Entanglement Entropy  

SciTech Connect

Entanglement entropy appears as a central property of quantum systems in broad areas of physics. However, its precise value is often sensitive to unknown microphysics, rendering it incalculable. By considering parametric dependence on correlation length, we extract finite, calculable contributions to the entanglement entropy for a scalar field between the interior and exterior of a spatial domain of arbitrary shape. The leading term is proportional to the area of the dividing boundary; we also extract finite subleading contributions for a field defined in the bulk interior of a waveguide in 3+1 dimensions, including terms proportional to the waveguide's cross-sectional geometry: its area, perimeter length, and integrated curvature. We also consider related quantities at criticality and suggest a class of systems for which these contributions might be measurable.

Hertzberg, Mark P. [Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); KIPAC and SITP, Stanford University, Stanford, California 94305 (United States); Wilczek, Frank [Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2011-02-04

245

The Allen File: Landmark in Nineteenth Century American Physical Education.  

ERIC Educational Resources Information Center

|America's approach to physical education and exercise in the schools is reflected in the contributions of two 19th-century physical educators named Allen, one of fairly major importance and one of less importance. Perhaps the most significant contributions to the development of school physical education were made by Nathaniel Topliff Allen at the…

Barney, Robert Knight

246

Physics Phridays  

NASA Astrophysics Data System (ADS)

Teaching high school physics involves cheerleading, coaching, and acting (in addition to course preparation, equipment maintenance/construction, and grading). One is like a performer that has to be ``on'' all the time to keep the attention and interest of students in order to engage them in the content. But what happens once the course is over? We hope that we have sparked some interest in physics that will continue and that our students take what they've learned with them, but the reality is often disappointing. Can we do better than hope? ``Physics Phridays'' might be a starting point.

Falbo, Maria

2007-12-01

247

Nuclear physics  

SciTech Connect

Questions facing nuclear physics today include the many dynamic forces that cannot be understood with elementary particles alone. New simple modes of nuclear excitation have become known, along with some completely new phenomena, such as vibration. This volume examines advances in nuclear physics, the impacts of nuclear physics on other disciplines and society, and current frontiers of nuclear research. Recommendations cover new accelerator plans, support of instrumentation, and the need for increased support of nuclear theory. In addition, the report notes that there is a projected shortage of new physicists and an acute current shortage of stable isotopes for medical and research purposes.

Not Available

1986-01-01

248

Casimir effect in dielectrics: Surface area contribution  

SciTech Connect

In this paper we take a deeper look at the technically elementary but physically robust viewpoint in which the Casimir energy in dielectric media is interpreted as the change in the total zero-point energy of the electromagnetic vacuum summed over all states. Extending results presented in previous papers we approximate the sum over states by an integral over the density of states {ital including finite volume corrections}. For an arbitrarily shaped finite dielectric, the first finite-volume correction to the density of states is shown to be proportional to the surface area of the dielectric interface and is explicitly evaluated as a function of the permeability and permitivity. Since these calculations are founded in an elementary and straightforward way on the underlying physics of the Casimir effect they serve as an important consistency check on field-theoretic calculations. As a concrete example we discuss Schwinger{close_quote}s suggestion that the Casimir effect might be the underlying physical basis behind {ital sonoluminescence}. The recent controversy concerning the relative importance of volume and surface contributions is discussed. For sufficiently large bubbles the volume effect is always dominant. Furthermore we can explicitly calculate the surface area contribution as a function of refractive index. {copyright} {ital 1997} {ital The American Physical Society}

Molina-Paris, C. [Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Visser, M. [Physics Department, Washington University, St. Louis, Missouri 63130-4899 (United States)

1997-11-01

249

Tank waste isotope contributions  

SciTech Connect

This document presents the results of a calculation to determine the relative contribution of selected isotopes to the inhalation and ingestion doses for a postulated release of Hanford tank waste. The fraction of the dose due to {sup 90}Sr, {sup 90}Y, {sup 137}Cs and the alpha emitters for single shell solids and liquids, double shell solids and liquids, aging waste solids and liquids and all solids and liquids. An effective dose conversion factor was also calculated for the alpha emitters for each composite of the tank waste.

VANKEUREN, J.C.

1999-08-26

250

Physics Notes  

ERIC Educational Resources Information Center

Describes physics experiments and apparatus construction for studies in astronomy, electricity, wave measurement and speed, the behavior of steel, and intermolecular forces. Includes a detailed description of how to simulate apparent trajectories of the moon and sun. (CS)

School Science Review, 1976

1976-01-01

251

Magic Physics?  

ERIC Educational Resources Information Center

|This article examines several readily available "magic tricks" which base their "trickery" on physics principles, and questions the use of the word "magic" in the 21st century, both in popular children's science and in everyday language. (Contains 18 figures.)|

Featonby, David

2010-01-01

252

Theoretical Physics.  

National Technical Information Service (NTIS)

This report contains the papers delivered at the 14th annual seminar on theoretical physics held at Golden Gate. The following topics were discussed: natural quark field confinement; boson expansions; model calculations for three particles outside a close...

1979-01-01

253

Tau physics  

SciTech Connect

This report discusses the following topics: {tau} production and related {tau} properties; general discussion of {tau} decays; leptonic decays; hadronic decays; the {tau} in atomic physics; and the {tau} neutrino: {nu}{sub {tau}}

Perl, M.L.

1993-03-01

254

Physics Notes  

ERIC Educational Resources Information Center

Twelve ideas are presented for physics teachers to implement in the laboratory or classroom. Topics covered include electromagnetic induction, microbalance, capacitors, determination of light velocity, and the compound pendulum. Information regarding laboratory equipment is also provided. (PS)

School Science Review, 1972

1972-01-01

255

Physical Dispersion.  

National Technical Information Service (NTIS)

The constitutive parameters, which are defined according to the approach presented in the recent report series to the TDFV case, are different for both of definitions and used functions. The authors call the physical dispersion this case. The conversion o...

T. Sengor

2001-01-01

256

Physics olympiad  

NASA Astrophysics Data System (ADS)

Five high school physics students will represent the U.S. at the 20th International Physics Olympiad, July 14-25 in Warsaw, Poland. The Olympiad has been held annually since 1967; this is the fourth year the U.S. will compete. The American Association of Physics Teachers administers the U.S. program; AGU is a principal sponsoring organization of the Olympiad, as is the American Institute of Physics.The students are Derrick Bass, North Miami Beach High School, Miami Beach, Fla.; Steven Gubser, Cherry Creek High School, Englewood, Colo.; Jason Jacobs, Baldwin Senior High School, Baldwin, N.Y.; Jessica Millar, West High School, Madison, Wise; and James Sarvis, Thomas Jefferson High School, Alexandria, Va.

257

Contest Physics.  

ERIC Educational Resources Information Center

|Discusses the use of contests to keep physics interesting and exciting for the students. Includes: balloon car, egg drop, tennis ball catapult, bridge building, mousetrap vehicle, musical instrument, slide photo, electric junk dissection, windmill generator, and solar heater. (MVL)|

Moehnke, Randy

1994-01-01

258

Physics 2000  

NSDL National Science Digital Library

This web site utilizes interactive visual exhibits to relate modern physics concepts to familiar real-world phenomena. It is qualitative and conceptual, aimed at a broad range of audiences and grade levels.

Goldman, Martin

2003-10-10

259

The Physics of Hang Gliding  

NASA Astrophysics Data System (ADS)

Dr. Hewett has received both national and international awards from the hang gliding community for his contributions to the safety of towing hang gliders. These contributions were a consequence of his applying his knowledge of physics to the sport of hang gliding. This lecture illustrates how these and other applications of the fundamental principles of physics have influenced the historical evolutions of hang gliding and paragliding from the earliest flights of Otto Lilienthal in 1891 through the more recent record breaking flights of more than 430 miles from Zapata Texas.

Hewett, Lionel D.

2008-03-01

260

Energy balance and physical activity.  

PubMed

The prevalence of obesity is increasing in most parts of the world and becoming one of the major global public health problems. Although the components of energy balance have not been adequately estimated over time, available evidence suggests that the increase in obesity is the result of reduced physical activity. Increases in physical activity have been shown to be strongly associated with improving physical fitness and body composition, with probably a positive effect on resting metabolic rate. The Surgeon General's Report on Physical Activity and Health advocates that 30 min of regular, moderate-intensity physical activity is associated with decreases in the risk of chronic diseases and may contribute to quality of life. However, the small changes that contribute 10 min for 3 times a day for aerobic training, or one set instead of three sets of repetitions on resistance training will provide individuals with health benefits. Indeed, nutrition and physical activity should be considered an integral part of fitness and good health, and should be encouraged in all age groups, particularly early in life. The question is no longer centered around the health benefit of increasing physical activity, but rather creating self awareness and behavior changes in individuals. Hence, effective intervention programs are needed that foster long term changes in physical activity. Among various interventions, the Nutrifit program was recently conducted in Thailand and found to improve health related fitness in children. The development of more effective interventions and approaches is a major challenge in this field today. PMID:11594471

Kuboonchoo, K

2001-06-01

261

Physics For Dummies  

NASA Astrophysics Data System (ADS)

The fun and easy way to understand the basic principles of physics How does gravity work? What does e=mc2 really mean? And what's a charm quark? Physics For Dummies answers these questions and more, explaining the basics of physical science and its importance in our everyday lives in a simple, clear, and entertaining fashion. Whether readers are taking a class, helping kids with homework, or are simply interested in how the world works, this plain-English guide gives them the knowledge they need to understand basic physics. Through real-world examples and problems, it covers such key topics as motion, energy, and waves (sound, light, wave-particle); solids, liquids, and gases; thermodynamics; electromagnetism; relativity; atomic and nuclear structures; and the Big Bang and stars. Steven Holzner, PhD (Ithaca, NY), is the author of more than 40 books and a former contributing editor at PC Magazine. He has been on the faculty of MIT and taught Physics 101 and 102 at Cornell for over ten years.

Holzner, Steve; Ph., D.

2005-11-01

262

Nuclear physics  

SciTech Connect

This book is a simple and direct introduction to the tools of modern nuclear physics, both experimental and mathematical. Emphasizes physical intuition and illuminating analogies, rather than formal mathematics. Topics covered include particle accelerators, radioactive series, types of nuclear reactions, detection of the neutrino, nuclear isomerism, binding energy of nuclei, fission chain reactions, and predictions of the shell model. Each chapter contains problems and illustrative examples. Pre-requisites are calculus and elementary vector analysis.

Patel, S.B. (Ramnarain Ruia Coll., Bombay (India))

1991-01-01

263

Nuclear physics  

SciTech Connect

A simple and direct introduction to the tools of modern nuclear physics, both experimental and mathematical. Emphasizes physical intuition and illuminating analogies, rather than formal mathematics. Topics covered include particle accelerators, radioactive series, types of nuclear reactions, detection of the neutrino, nuclear isomerism, binding energy of nuclei, fission chain reactions, and predictions of the shell model. Each chapter contains problems and illustrative examples. Prerequisites are calculus and elementary vector analysis.

Patel, S.B.

1988-01-01

264

Physics Portal  

NSDL National Science Digital Library

As part of the Journal Nature's Web site, the Physics Portal, is an online resource providing physicists easy access to timely, relevant research. After the free registration users can view current and past articles, arranged by subject including everything from astro to quantum physics. The site also contains news articles, meeting and job information, a links page, and more, making it a must-stop for any researcher or educator in the field.

2002-01-01

265

Football Physics  

NASA Astrophysics Data System (ADS)

This talk discusses a series of one-minute physics lectures given to the ˜ 8 x 10^4 fans that attend the University of Nebraska home football games. The lecture topics range from gyroscopic motion to ionizing collisions between linebackers and I-backs. The problem of simultaneous edification and amusement of the fan in the stands is considered. Several physics tips for the Vols will be proffered.

Gay, Timothy

2006-05-01

266

Advancements in Solar Neutrino Physics  

NASA Astrophysics Data System (ADS)

We review the results of solar neutrino physics, with particular attention to the data obtained and the analyses performed in the last decades, which were determinant to solve the solar neutrino problem (SNP), proving that neutrinos are massive and oscillating particles and contributing to refine the solar models. We also discuss the perspectives of the presently running experiments in this sector and of the ones planned for the near future and the impact they can have on elementary particle physics and astrophysics.

Miramonti, Lino; Antonelli, Vito

2013-05-01

267

Contemporary Physics  

NASA Astrophysics Data System (ADS)

section I. Synchroton radiation and applications. 1. Physics and biology: applications of synchroton radiation in biology / Louise N. Johnson. 2. Sesame - a project to foster science and peace and its relevance for the region / Herwig Schopper. 3. The impact of synchroton light sources on science and society in developing countries / Herman Winick -- section II. Quantum physics and quantum information. 1. Discrimination of quantum states with selected applications / János A. Bergou. 2. Physical problems of brain-computer interfacing / Peter Fromherz. 3. NMR implementation of exponential sums for integer factorization / M. Stefanák ... [et al.] -- section III. Nonlinear phenomena and plasma physics. 1. Complexity and hydrodynamic turbulence / K. R. Sreenivasan. 2. Nonlinear interactions in quantum systems / P. K. Shukla and B. Eliasson. 3. Vortex in plasmas - topology, singularity and scale hierarchy / Z. Yoshida -- section IV. Nanophysics and applications. 1. Symmetry and novelty in the electronic and geometric structure of nanoalloys: the case of Ag[symbol]Cu[symbol] / M. Alcántara Ortigoza and T. S. Rahman. 2. New approaches to photovoltaic and photoelectrochemical energy conversion / S. Ismat Shah ... [et al.] -- section V. Particle physics, gravity and cosmology. 1. Theoretical interest in B-meson physics at the B factories, tevatron and the LHC / Ahmed Ali. 2. Quantum gravity and black holes / Viqar Husain. 3. Constraints on alternative theories of gravity and cosmology / Alexander F. Zakharov.

Aslam, Jamil; Hussain, Faheem; Riazuddin

2008-04-01

268

Henry Crew, a successful teacher of physics  

NASA Astrophysics Data System (ADS)

Henry Crew had a long career in teaching physics at Johns Hopkins University, Haverford College, and Northwestern University. In those decades, Crew made great contributions to physics education. He published 13 books including popular textbooks and well-known translations. His 123 scientific articles included works on spectroscopy, physics education, history of science, biographies of physics, and so forth. He was awarded the highest honor for a physics teacher in the United States-the Oersted Medal. At the same time, he was an active scientist, and he participated as a founder of such academic societies as the American Physical Society, the American Association of University Professors, and the History of Science Society.

Qiaozhen, Xu; Michaelson, Robert C.

1987-09-01

269

Physics Songs and Physics Poems  

NSDL National Science Digital Library

Hosted by Haverford College and maintained by Associate Professor of Physics Walter F. Smith, the PhysicsSongs.org Web site is just that. Students and educators will find songs that have been written about such things as Gauss's Law, The Twelve Days of Newton, The Relativity Song, and more. Words are provided, and some even contain playable recordings. Who said learning isn't fun?

Smith, Walter F.

2001-01-01

270

Alternatives aux prothèses mammaires  

Microsoft Academic Search

The use of implants is a basic technique in breast reconstruction after mastectomy, for the correction of breast abnormalities or even more in aesthetic breast augmentation. However, especially in difficult cases, implants can have inconveniences and insufficiencies (poor natural aspect, necessity of replacement, capsular contracture). To mitigate these, numerous alternatives were developed. These autologous techniques use mainly the pedicled or

E. Delay; T. Delaporte; R. Sinna

2005-01-01

271

PHYSICS TODAY--INTRODUCTORY PHYSICS EDUCATION.  

ERIC Educational Resources Information Center

|THIS SPECIAL ISSUE OF "PHYSICS TODAY" REVIEWS THE STATUS OF SECONDARY SCHOOL PHYSICS, AS WELL AS COLLEGE PHYSICS AND PHYSICAL SCIENCE. SECONDARY LEVEL PROJECTS INCLUDE PHYSICAL SCIENCE STUDY COMMITTEE PHYSICS, HARVARD PROJECT PHYSICS, THE ENGINEERING CONCEPTS CURRICULUM PROJECT, AND THE NUFFIELD PROJECT. THOSE AT THE COLLEGE LEVEL INCLUDE THE…

1967

272

Dietary and Physical Activity Behaviors of Middle School Youth: The Youth Physical Activity and Nutrition Survey  

ERIC Educational Resources Information Center

|Background: Obesity has become a national epidemic among youth. Declining physical activity and poor nutrition contribute to this epidemic. The purpose of this study was to obtain data on middle school students' physical activity and nutrition knowledge and practices. Methods: The Youth Physical Activity and Nutrition Survey was developed and…

Zapata, Lauren B.; Bryant, Carol A.; McDermott, Robert J.; Hefelfinger, Jennie A.

2008-01-01

273

Physics and cosmology - Some interactions  

NASA Astrophysics Data System (ADS)

A review is given of interactions between physics and cosmology since Georges Lemaitre's seminal paper on the expanding universe (1927). The contributions of several major researchers since then are examined. Topics covered include: the status of general relativity in cosmology, the cosmology of G. Lemaitre (including the age of the universe, galaxy formation, and the interpretation of the big-bang), the observed cosmos, cosmology since Lemaitre, inflation, primeval fluctuations, physics, and cosmical numbers. The present developments in physics seem to promise some imminent progress in reducing the catalog of unsolved problems.

McCrea, W. H.

274

The Physics of Granular Media  

Microsoft Academic Search

This new reference provides quick access to the current level of knowledge, containing high-level review articles covering recent developments in the field of granular media from the viewpoints of applied, experimental, and theoretical physics. The authors represent different directions of research in the field, with their contributions covering: static properties of granular materials sand piles and avalanches vibration-induced patterns segregation

Haye Hinrichsen; Dietrich E. Wolf

2005-01-01

275

Overview of strangeness nuclear physics  

SciTech Connect

Novel as well as puzzling aspects of strangeness (S = {minus}1 and S = {minus}2) nuclear physics are highlighted. Opportunities to gain new insights into hypernuclear spectroscopy, structure, and weak decays and to contribute to the continuing effort to understand the fundamental baryon-baryon force are outlined. Connections to strangeness in heavy-ion reactions and astrophysics are noted.

Gibson, B.F.

1998-12-01

276

Black Physical Educators and Utilitarianism.  

ERIC Educational Resources Information Center

The contributions of black professional personnel to the field of physical education are enumerated and described. The careers of Anita J. Turner, Edwin B. Henderson, and Albert J. Overly in particular are examined. The ability of a minority group to provide significant leadership in an educational field is discussed, and the challenge still…

Coursey, Leon N.

277

Physical Education and the ABCs: An Interdisciplinary Approach  

ERIC Educational Resources Information Center

An interdisciplinary approach to teaching physical education can contribute in many ways to the mission of the school. It can draw interest in physical education from administrators, parents, and community members, and can help legitimize the position of the physical educator on the faculty by showing colleagues in the classroom that physical

Grube, Dan; Beaudet, Bob

2005-01-01

278

Student Blogging about Physics  

NASA Astrophysics Data System (ADS)

In traditional introductory physics classes, there is often limited opportunity for students to contribute their own ideas, interests, and experiences as they engage with the subject matter. This situation is exacerbated in university lecture-format classes, where students may not feel comfortable speaking during class. In the last few years, Internet blogs have become a decentralized format for diarists, independent journalists, and opinion makers to both post entries and allow commentary from their readers. Below, I will describe some techniques for using student blogging about physics to engage students from two different classroom environments: a calculus-based introductory mechanics class for scientists and engineers, and an honors seminar for first-year students. These assignments required them to make their own connections between classroom knowledge and situations where it might find applications. A second goal of including blogging in the introductory physics course was to induce students to write about the physics content of the class in a more substantive way than was previously part of the class.

Daniels, Karen E.

2010-09-01

279

Quantum Physics  

Microsoft Academic Search

In Quantum Mechanics operators must be hermitian and, in a direct product space, symmetric. These properties are saved by Lie algebra operators but not by those of quantum algebras. A possible correspondence between observables and quantum algebra operators is suggested by extending the definition of matrix el- ements of a physical observable, including the eventual projection on the appro- priate

E. Celeghini; M. A. del Olmo

1969-01-01

280

Physics Notes.  

ERIC Educational Resources Information Center

Presented are physics experiments, laboratory procedures, demonstrations, and classroom materials/activities. Experiments include: speed of sound in carbon dioxide; inverse square law; superluminal velocities; and others. Equipment includes: current switch; electronic switch; and pinhole camera. Discussion of mechanics of walking is also included.…

School Science Review, 1983

1983-01-01

281

Collaboration Physics  

ERIC Educational Resources Information Center

|What happens when university curriculum developers are mixed with motivated elementary teachers? ? An awesome learning collaboration that benefits researchers, teachers, and students! That's what the authors discovered when they--university researchers involved in the Physics for Elementary Teachers (PET) project--teamed up with local elementary…

Harlow, Danielle; Otero, Valerie K.

2005-01-01

282

DOING Physics.  

ERIC Educational Resources Information Center

Several good features of a projectile motion experiment (students fire their own rockets) are described, including accuracy achieved, low cost and relative safety. Also described is a simple novelty toy (originally distributed by McDonalds foods) illustrating physics concepts. Blowing on this toy pipe propels a thread around in a loop. (JN)

Zwicker, Earl, Ed.

1983-01-01

283

Health physics  

Microsoft Academic Search

This progress report in health physics is introduced by a brief history of the development of the subject. The important units of radiation measurement are discussed, together with the concepts of relative biological effectiveness. The current International Commission on Radiological Protection (ICRP) maximum permissible doses are given and the method of calculation of maximum permissible concentrations (MPCs) for air and

G. W. Dolphin; W. J. Megaw; J. Rundo

1962-01-01

284

Physics Notes.  

ERIC Educational Resources Information Center

|Laboratory procedures, equipment, teaching ideas, and resource materials related to physics are discussed. Topics include the construction of a liquid-metal pump, a hydraulic jack, and an apparatus which helps teach time/velocity graphs; current/voltage characteristics of a tungsten filament lamp; and an electric circuit game. (DC)|

School Science Review, 1981

1981-01-01

285

Physics Notes.  

ERIC Educational Resources Information Center

|Demonstrations, procedures, games, teaching suggestions and information on a variety of physics topics are presented, including hydraulic rams, units and formulae, static electric motors, a computer graphics program, diffraction, adaptation of a basic meter, photoelasticity, photo-diodes, radioactive decay, and analog-digital conversions. (DC)|

School Science Review, 1982

1982-01-01

286

Physics Notes.  

ERIC Educational Resources Information Center

Discusses some high school physics demonstrations and experiments on a variety of topics: such as uses of the dipole, the vapour-liquid critical point, velocity of sound in metallic rods, the flux-density near a bar magnet, and a different style logic gate using basic units. (GA)

School Science Review, 1978

1978-01-01

287

Unifying Physics  

NASA Astrophysics Data System (ADS)

Century old GR fails to unify quantum physics, nuclear force or distinguish between the mass of living bodies from inert mass. Probabilistic gravity [1] explains strong coupling (nuclear force). The natural log of the age of the universe, 10E60 in Planck times, equaling 137 (1/Alpha) extends physics to deeper science, if we stand on the shoulders of giants like Feynman and Gamow. Implications of [1] are that it is not the earth, but M and S numbers of the particles of the earth are remotely interacting with corresponding numbers of the particles of the moon and the sun respectively, neglecting other heavenly bodies in this short draft. This new physics is likely to enable creative scientific minds to throw light on a theoretical basis for an otherwise arbitrary cosmological constant, uniformity of microwave background, further vindication of Boltzmann, quantum informatics, Einstein’s later publicized views and more, eliminating the need to spend money for implicitly nonexistent quantum gravity and graviton.[4pt] [1] Journal of Physical Science and Applications 2 (7) (2012) 265-268.

Goradia, Shantilal

2013-04-01

288

Physical Units  

NSDL National Science Digital Library

This page describes units of measurement, unit conversions, dimensional analysis and basic mechanical quantities. Length, Mass and Time link to separate pages that go into more detail on the physical quantities and their definitions. Also included is a link to a page that does unit conversions for the user.

Nave, Carl R.

2004-12-15

289

Physics Demonstrations  

NSDL National Science Digital Library

A collection of in-depth physics demonstrations with instructions for doing it yourself, videos that let you see how it's done, and suggestions for developing some of the demos into experiments. The demonstrations were developed and tested by The Science House, the mathematics and science learning outreach project of North Carolina State University.

290

Physics Demonstrations: Fowler's Physics Applets  

NSDL National Science Digital Library

Michael Fowler, Commonwealth Professor of Physics at the University of Virginia, offers this prime collection of (some still in progress) physics demonstrations. Applets (Java) demonstrate such classic principles as Newton's Cannon (in which the user may fire red cannonballs at different velocities from a tall mountain -- and see which of them will orbit the earth), Group Velocity and Phase Velocity, Two-dimensional Collisions, Projectile Motion, Brownian Motion, and One-dimensional One-atom classical Gas, among others. Inquisitive users may download the applet as a .zip file, as source code, or with related class materials. A series of related applets are listed, as are links to resources such as TIPTOP, The Internet Pilot to Physics (described in the April 19, 1996 Scout Report).

291

Business Contributions to Community Service.  

National Technical Information Service (NTIS)

The study, which examines and describes 1989 contributions by Oregon businesses to community service, found that contributions patterns of small businesses differed from those of large businesses. Small businesses gave more than large businesses based on ...

P. Frishkoff

1991-01-01

292

Philosophy and 20th Century Physics  

Microsoft Academic Search

The celebration in 2005 of the centennial of the “miraculous year” during which Einstein produced his articles on the energy\\u000a quanta, on the Brownian motion and on restricted relativity has provided an opportunity to draw up a comprehensive assessment\\u000a of the contribution of 20th century physics to human knowledge. One must recognize that this contribution is impressive. Contemporary\\u000a physics has

Gilles Cohen-Tannoudji

293

EMSL Contribution Plan  

SciTech Connect

This Contribution Plan is EMSL’s template for achieving our vision of simultaneous excellence in all aspects of our mission as a national scientific user facility. It reflects our understanding of the long-term stewardship we must work toward to meet the scientific challenges faced by the Department of Energy (DOE) and the nation. During the next decade, we will implement the strategies contained in this Plan, working closely with the scientific community, our advisory committees, DOE’s Office of Biological and Environmental Research, and other key stakeholders. This Plan is fully aligned with the strategic plans of DOE, its Office of Science, and the Pacific Northwest National Laboratory (PNNL). We recognize that shifts in science and technology, national priorities, and resources made available through the Federal budget process create planning uncertainties and, ultimately, a highly dynamic planning environment. Accordingly, this Plan should be viewed as a living document and we continually evaluate the changing needs and opportunities posed by our stakeholders (i.e., DOE, users, staff, advisory committees), work closely with them to understand and respond to those changes, and align our strategy accordingly. This Plan is organized around two sections. Section 1 describes our vision and four strategic outcomes: 1) Scientific Innovation, 2) Capabilities that Transform Science, 3) Outstanding Management and Operations, and Engaged and Proactive Users. These outcomes provide the framework for seven critical actions we must take during the next 3 to 5 years: 1) Establishing leadership in EMSL science themes, 2) building and deploying transformational capabilities, 3) integrating computation with experiment, 4) ensuring EMSL’s workforce meets the scientific challenges of the future, 5) creating partnerships, 6) attracting and engaging users in EMSL’s long-term strategy, and 7) building a research infrastructure that meets emerging scientific needs. Section 2 describes EMSL’s detailed business plan, including an analysis of opportunity, organizational investments, and actionable milestones.

Campbell, Allison A.

2008-12-01

294

Physical Impairment  

NASA Astrophysics Data System (ADS)

Many health conditions can lead to physical impairments that impact computer and Web access. Musculoskeletal conditions such as arthritis and cumulative trauma disorders can make movement stiff and painful. Movement disorders such as tremor, Parkinsonism and dystonia affect the ability to control movement, or to prevent unwanted movements. Often, the same underlying health condition also has sensory or cognitive effects. People with dexterity impairments may use a standard keyboard and mouse, or any of a wide range of alternative input mechanisms. Examples are given of the diverse ways that specific dexterity impairments and input mechanisms affect the fundamental actions of Web browsing. As the Web becomes increasingly sophisticated, and physically demanding, new access features at the Web browser and page level will be necessary.

Trewin, Shari

295

Physics Applets  

NSDL National Science Digital Library

Created as part of the Museum Informatics Project at the University of California, Berkeley, this website serves as a clearinghouse of high-quality physics applets that can be used in a variety of settings. The site is divided into a few basic topical areas, such as mechanics, waves, properties of heat and matter, and optics. While a search engine isn't provided, visitors can use the "Find" function provided by most browsers to look for specific items of interest. It is worth noting that the applets dealing with various fields of optics are quite strong, and visitors will no doubt locate at least a handful of applets here that they can use in the classroom or just to increase their own understanding of physics.

296

Conceptual Physics  

NSDL National Science Digital Library

This web site contains a free textbook for a non-mathematical Conceptual Physics course aimed at high school or beginning college students. The author adopts a modern approach to understanding physics revolving around the concepts of symmetry and conservation laws. Specific topics include Conservation of Mass and Energy, Conservation of Momentum, Relativity, Electricity and Fields, The Ray Model of Light, and Waves. The textbook is designed for a one semester course, but some chapters can easily be omitted for a shorter course. It is available in a freely downloadable pdf format or can be quickly navigated online with html chapter links. A printed version is available for purchase for the cost of printing and shipping.

Crowell, Benjamin

2007-10-04

297

Distinguishing possible mechanisms for auxin-mediated developmental control in Arabidopsis: models with two Aux/IAA and ARF proteins, and two target gene-sets.  

PubMed

New models of gene transcriptional responses to auxin signalling in Arabidopsis are presented. This work extends a previous model of auxin signalling to include networks of gene-sets which may control developmental responses along auxin gradients. Key elements of this new study include models of signalling pathways and networks involving two Aux-IAA proteins (IAAs), auxin response factors (ARFs) and gene targets. Hypotheses for the gene network topologies which may be involved in developmental responses have been tested against experimental observations for root hair growth in particular. In studying these models, we provide a framework for the analysis of auxin signalling with multiple IAAs and ARFs, and discuss the implications of bistability in such systems. PMID:22067512

Bridge, L J; Mirams, G R; Kieffer, M L; King, J R; Kepinski, S

2011-10-31

298

Neutrino physics  

SciTech Connect

Thanks to compelling evidence that neutrinos can change flavor, we now know that they have nonzero masses, and that leptons mix. In these lectures, we explain the physics of neutrino flavor change, both in vacuum and in matter. Then, we describe what the flavor-change data have taught us about neutrinos. Finally, we consider some of the questions raised by the discovery of neutrino mass, explaining why these questions are so interesting, and how they might be answered experimentally.

Kayser, Boris; /Fermilab

2005-06-01

299

Hypernuclear physics  

SciTech Connect

A brief overview of progress made in the study of hypernuclear physics is presented. The use of ..lambda..-hypernuclei to study properties of conventional (nonstrange) nuclei is explored. Our knowledge of the hyperon-nucleon force is reviewed. Anecdotal examples of interesting hypernuclear phenomena are discussed. The status of ..sigma..-hypernuclei is considered along with a search for the ''H'' dibaryon. 30 refs., 10 figs.

Gibson, B.F.

1987-01-01

300

Soil physics  

SciTech Connect

In response to shifting research interests, this 5th edition book has been prepared to present contemporary information on traditional as well as current soil physics topics. Soil solid phase and soil dynamics have been reduced from 5 chapters in the previous edition to a single chapter here. Wind and water erosion have been eliminated. Information concerning transport of heat, water and chemicals has been expanded. Soil water relations, thermal regime aeration, solute transport and spatial variations of soil properties are well covered.

Jury, W.A.; Gardner, W.H.; Gardner, W.H.

1991-01-01

301

Youtube Physics  

NASA Astrophysics Data System (ADS)

Through the use of YouTube, we can show our students demos that we do not have the capability of doing in class. We can use these videos to inspire them and show them some of the cutting-edge discoveries in our field. We can also show them videos from around the world. Students need to realize that the physics community is global, not just national. They should learn to marvel in the discoveries made by physicists from all nations.

Riendeau, Diane

2012-02-01

302

Physical Geology  

NSDL National Science Digital Library

This Tulane University course covers the nature of the Earth, the development of its surficial features, and the results of the interaction of chemical, physical, and biological factors on the planet. Lecture notes are about energy and minerals; igneous, metamorphic and sedimentary rocks; weathering and soils; geologic time; mass wasting; streams; groundwater; wind action and deserts; oceans; deformation of rock; earthquakes and the interior of the Earth; global tectonics; planetary changes; and glaciers.

Nelson, Stephen

303

Attraction to Physical Activity in Urban Schoolchildren: Parental Socialization and Gender Influences.  

ERIC Educational Resources Information Center

|This study examined the contribution of parent socialization and gender to urban elementary students' (N=107) interest in physical activity. Questionnaires indicated significant relationships between parental socialization processes and children's perceived physical competence and attraction to physical activity. (SM)|

Brustad, Robert J.

1996-01-01

304

Integrating Physical Activity into Academic Pursuits  

ERIC Educational Resources Information Center

|Children of today may be the first generation in the United States in more than 200 years to have a life expectancy shorter than their parents. Low levels of fitness caused by physical inactivity and poor nutritional habits of many of today's youth may be a contributing factor. Combating low fitness levels with physical activity is of utmost…

Gaus, Mark D.; Simpson, Cynthia G.

2009-01-01

305

Physics of iron  

SciTech Connect

This volume comprises papers presented at the AIRAPT Conference, June 28 to July 1993. The iron sessions at the meeting were identified as the Second Ironworkers Convention. The renewal of interest stems from advances in technologies in both diamond-anvil cell (DAC) and shock wave studies as well as from controversies arising from a lack of consensus among both experimentalists and theoreticians. These advances have produced new data on iron in the pressure-temperature regime of interest for phase diagrams and for temperatures of the core/mantle and inner-core/outer-core boundaries. Particularly interesting is the iron phase diagram inferred from DAC studies. A new phase, {beta}, with a {gamma}-{beta}-{epsilon} triple point at about 30 GPa and 1190 K, and possible sixth phase, {omega}, with an {epsilon}-{Theta}-melt triple point at about 190 GPa and 4000 K are deemed possible. The importance of the equation of state of iron in consideration of Earth`s heat budget and the origin of its magnetic field invoke the interest of theoreticians who argue on the basis of molecular dynamics and other first principles methods. While the major thrust of both meetings was on the physics of pure iron, there was notable contributions on iron alloys. Hydrogen-iron alloys, iron-sulfur liquids, and the comparability to rhenium in phase diagram studies are discussed. The knowledge of the physical properties of iron were increased by several contributions.

Anderson, O.

1993-10-01

306

Women in Physics.  

ERIC Educational Resources Information Center

|This booklet presents information about career opportunities for women in physics. Included are summaries of research areas in physics (optical physics, solid-state physics, materials science, nuclear physics, high-energy physics, astrophysics, cryogenics, plasma physics, biophysics, atmospheric physics) and differences between theory and…

Roth, Laura M.; O'Fallon, Nancy M.

307

Recent Development in Proton Spin Physics  

SciTech Connect

In the naive model of the proton, its 1/2 spin is carried by its quark constituents. However, experiments over the last several decades have shown that the quark spin only contribute a small portion of the proton spin. In this talk, I will present recent developments exploring this proton spin puzzle, and focus on the progress made in the last few years on the longitudinal spin physics, the generalized parton distribution physics, and the transverse spin physics.

Yuan, Feng

2008-12-10

308

Undergraduate physics research at ILP  

NASA Astrophysics Data System (ADS)

I will describe how undergraduate physics students can become involved in research work in theoretical atomic and laser physics. This is an ideal research area in which even high school students or students in their Freshman year can actively contribute by performing a wide variety of computer simulations. I will also describe how the curriculum of physics department has evolved in the last thirty years to make student research work one of its center missions. Illinois State University has a Bachelor's degree sequence in computational physics that was created to foster student-faculty collaborative research projects. Originally intended as a recruitment tool, it turned into a retention tool for our majors. I will give a few examples of research projects that involve undergraduate students in an essential way. These range from classical mechanical simulations to accompany of our studies of how matter in form of electron-positron pairs can be created from vacuum to bio-optical imaging schemes.

Grobe, Rainer

2007-10-01

309

Racetrack physics  

NASA Astrophysics Data System (ADS)

This article makes plausible assumptions to physically model the 1973 Kentucky Derby, won by the legendary U.S. turf champion Secretariat. A kinematics condition is prescribed to model the start-up of the race, leading to typical estimates of the exertion forces involved at start-up. Other dynamical factors involving racing around the turns, as well as drag effects and the advantage of cover in racing, are examined. Velocity-time graphs are given that can be used by teachers to illustrate their effectiveness to students.

Putt, Graeme D.

2001-01-01

310

Hadron physics  

SciTech Connect

Is all hadronic physics ultimately describable by QCD. Certainly, many disparate phenomena can be understood within the QCD framework. Also certainly, there are important questions which are open, both theoretically (little guidance, as yet) and experimentally, regarding confinement. Are there dibaryons, baryonium, glueballs. In addition, there are experimental results which at present do not have an explanation. This talk, after a short section on QCD successes and difficulties, will emphasize two experimental topics which have recent results - glueball spectroscopy and exclusive reactions at large momentum transfer. Both are experimentally accessible in the AGS/LAMPF II/AGS II/TRIUMF II/SIN II energy domain.

Bunce, G.

1984-05-30

311

Applications des Procedes Sol-Gel aux Composites Ceramiques (Application of Sol-Gel Procedures to Ceramic Composites).  

National Technical Information Service (NTIS)

Colloidal solutions were synthesized and characterized in order to contribute to the development of ceramics based on aluminum phosphate, lithium silico-aluminate, and magnesium silico-aluminate. The surface deposits on carbon-carbon and carbon-SiC compos...

L. Coury

1987-01-01

312

High energy physics research  

SciTech Connect

This is a progress report on the first year of the five year proposal of the UCSD high energy physics group. The main activity of our group continues to be the L3 experiment at LEP. During the last year in L3, we have worked principally on physics analysis. We have also fulfilled our duties in running the detector and contributing to L3 software and computing. In addition, we have made a major effort toward the development of the GEM detector at the SSC. Our SSC work is done in collaboration with the other UCSD groups which are primarily supported by the NSF. In this progress report, we will review our recent activities and describe the current status of the group. Some of the publications and documents which display the work of our group over the last year are included as appendices. We will also outline our research plan to continue our participation in L3 physics and upgrades and to work on the design and construction of the GEM detector.

Branson, J.

1992-01-01

313

Edgard C. Moreno, PhD: A Tribute to His Major Contributions to Oral Biology Research  

Microsoft Academic Search

The seminal contributions of Dr. Edgard C. Moreno to physical chemical aspects of oral biology research are reviewed, with personal insights provided by the author. Dr. Moreno has made major contributions to our understanding of fundamental processes which occur within the oral cavity and which control the formation of mineralized tissues. These contributions include extensive research in the areas of:

Henry C. Margolis

1998-01-01

314

EDITORIAL: Physics competitions Physics competitions  

NASA Astrophysics Data System (ADS)

1. Physics competitions: aims and realizations One aim of physics competitions is to increase the interest of young students, primarily at upper secondary level, to physics and natural sciences in general. A competition has motivational aspects known usually from sports events or games—comparing one's own ability with others, of course with the desire to be better and to win. If competitions reach nationwide and even international levels, additional stimulation is created. Competitions provide greatest attraction to possible winners, to the group of gifted people in a particular field. This implies that science contests are excellent tools for the promotion of talented students. Traditional teaching has been shown to have problems in supporting this group of students. Very often teachers are overstretched with the demands of teaching both low- and high-level students. Extracurricular activities are therefore a good chance to relieve the teacher, and to give talented students the opportunity for appropriate training and challenge. The competitions, however, have a broader impact and address more young people than one might guess from the statements above. Training courses and selection at school level give a larger group of students extra and, to some extent, complimentary education in physics. The degree of complexity of the tasks corresponds very often to the standards of the next level of education in the school system. Interestingly, many physics competitions have their origin in countries beyond the former Iron Curtain. They started as regional and national tournaments, were joined by neighbouring countries and have grown, in some cases, to events with participants from more than 80 countries. Although the features mentioned above are common to the different competitions, there are distinct differences between them [1]. The International Physics Olympiad (IPhO) is the oldest international physics competition for students at upper secondary level [2]. It dates back to 1967, when the first Olympiad was organized in Warsaw, Poland. Today this Olympiad is a worldwide enterprise, and in the 2008 competition in Hanoi, Vietnam, students from 82 countries took part. An overview of the problems and a summary of the results of this Olympiad are given in the first paper, prepared by the organizers of the competition [3]. The students work on four or five different problems, three theoretical ones on one day, and one or two experimental tasks on another. On each day, they have five hours to accomplish their tasks. The problems are prepared by the local organizer, usually a team of physicists from universities in the home country. The level is set by an international syllabus, and the content and wording of the problems have to be agreed by a majority of the supervisors (one from each participating country) in an initial meeting. Afterwards the tasks are translated into the various languages of the competitors; the students also write their results in their own language. The number of awards (gold, silver and bronze, as well as honorable mentions) varies from competition to competition, since it depends on the number of participants. A team consists of at most five students, but they do not act as a team—they work independantly. The selection process in individual countries varies, but is usually executed in several steps, starting from school competitions and going on to regional and national ones. Training courses are often organized on the same levels. Big differences can be seen in training courses at the highest level, the duration ranging from one week to several months. The International Young Physicists Tournament (IYPT) is completely different in spirit [4]. Whereas the students work individually in the Olympiad, IYPT is a competition between teams. In addition, the 17 tasks are known almost a year in advance. The problems are very open, allow for different approaches and include experimental as well as theoretical work. The students are allowed to use any method they like, are coached by teachers, and are encouraged

Jordens, H.; Mathelitsch, L.

2009-11-01

315

Sport, Physical Activity and Well-Being: An Objectivist Account  

ERIC Educational Resources Information Center

It is widely maintained that sport and physical activities contribute to the development of young people's well-being. Others argue that sports' contribution to good living is so strong that it is even thought to be a human right. Typically, however, the value of physical activity and sport to our well-being is conceptualized and researched within…

Bloodworth, Andrew; McNamee, Mike; Bailey, Richard

2012-01-01

316

Sport, Physical Activity and Well-Being: An Objectivist Account  

ERIC Educational Resources Information Center

|It is widely maintained that sport and physical activities contribute to the development of young people's well-being. Others argue that sports' contribution to good living is so strong that it is even thought to be a human right. Typically, however, the value of physical activity and sport to our well-being is conceptualized and researched…

Bloodworth, Andrew; McNamee, Mike; Bailey, Richard

2012-01-01

317

Sport, physical activity and well-being: an objectivist account  

Microsoft Academic Search

It is widely maintained that sport and physical activities contribute to the development of young people's well-being. Others argue that sports’ contribution to good living is so strong that it is even thought to be a human right. Typically, however, the value of physical activity and sport to our well-being is conceptualized and researched within a subjectivist framework. We reject

Andrew Bloodworth; Mike McNamee; Richard Bailey

2012-01-01

318

Sport, physical activity and well-being: an objectivist account  

Microsoft Academic Search

It is widely maintained that sport and physical activities contribute to the development of young people's well-being. Others argue that sports’ contribution to good living is so strong that it is even thought to be a human right. Typically, however, the value of physical activity and sport to our well-being is conceptualized and researched within a subjectivist framework. We reject

Andrew Bloodworth; Mike McNamee; Richard Bailey

2011-01-01

319

Physical Properties  

NSDL National Science Digital Library

In several of the previous chapters we have talked about the strength of polymers and pointed out some of the unusual properties that make them both interesting and extremely useful materials. Now it is time to understand some of the fundamental reasons for this behavior. We will examine the structure of polymers a bit more carefully so that we can better understand their physical and mechanical properties and discover why plastics such as HDPE (high-density polyethylene), PS (polystyrene), and Kevlar are so different from each other. In this case, the "structure" on which we will focus is the morphology of the sample. We will see that polymers characteristically have amorphous and/or crystalline morphologies.

Teegarden, David

2004-01-01

320

Beam physics at Tevatron complex  

SciTech Connect

The challenge of achieving the Tevatron Run II luminosity goal of 3 {center_dot} 10{sup 32} cm{sup -2} s{sup -1} requires high level of engineering and machine operation, good and reliable diagnostics, and clear understanding of the underlying accelerator physics. Recent history demonstrated steady increase of the Tevatron luminosity, which was supported by each of the three listed above items. This report reviews major developments in the accelerator physics, which contributed in the Run II luminosity growth. Present limitations of the luminosity and projections of further luminosity growth are also discussed.

Valeri A. Lebedev

2003-05-28

321

U.S. Contributions to ITER  

SciTech Connect

The United States participates in the ITER project and program to enable the study of the science and technology of burning plasmas, a key programmatic element missing from the world fusion program. The 2003 U.S. decision to enter the ITER negotiations followed an extensive series of community and governmental reviews of the benefits, readiness, and approaches to the study of burning plasmas. This paper describes both the technical and the organizational preparations and plans for U.S. participation in the ITER construction activity: in-kind contributions, staff contributions, and cash contributions as well as supporting physics and technology research. Near-term technical activities focus on the completion of R&D and design and mitigation of risks in the areas of the central solenoid magnet, shield/blanket, diagnostics, ion cyclotron system, electron cyclotron system, pellet fueling system, vacuum system, tritium processing system, and conventional systems. Outside the project, the U .S. is engaged in preparations for the test blanket module program. Organizational activities focus on preparations of the project management arrangements to maximize the overall success of the ITER Project; elements include refinement of U.S. directions on the international arrangements, the establishment of the U.S. Domestic Agency, progress along the path of the U.S. Department of Energy's Project Management Order, and overall preparations for commencement of the fabrication of major items of equipment and for provision of staff and cash as specified in the upcoming ITER agreement.

Ned R. Sauthoff

2005-05-13

322

Collaborating on contributions to conversations  

Microsoft Academic Search

Contributing to conversation, it is proposed, is accomplished in two phases. In the presentation phase, one participant ordinarily presents a stretch of speech intended to specify the content of his or her contribution. In the acceptance phase, all the participants work together to establish the mutual belief that everyone else has understood that content well enough for current purposes. The

Herbert H. Clark; Edward F. Schaefer

1987-01-01

323

Physical Activity And Physical Fitness  

PubMed Central

The focus of the PhenX (Phenotypes and eXposures) Toolkit is to provide researchers whose expertise lies outside a particular area with key measures identified by experts for uniform use in large-scale genetic studies and other extensive epidemiologic efforts going forward. The current paper specifically addresses the PhenX Toolkit research domain of physical activity and physical fitness (PA/PF), which are often associated with health outcomes. A Working Group (WG) of content experts completed a 6-month consensus process in which they identified a set of 14 high-priority, low-burden, and scientifically supported measures. During this process the WG considered self-reported and objective measures which included the latest technology (e.g., accelerometers, pedometers, heart-rate monitors). They also sought the input of measurement experts and other members of the research community during their deliberations. A majority of the measures include protocols for children (or adolescents), adults, and older adults or are applicable to all ages. Measures from the PA/PF domain and 20 other domains are publicly available and found at the PhenX Toolkit website, www.phenxtoolkit.org. The use of common measures and protocols across large studies enhances the capacity to combine or compare data across studies, benefitting both PA/PF experts and non-experts. Use of these common measures by the research community should increase statistical power and enhance the ability to answer scientific questions that might have previously gone unanswered.

Haskell, William L.; Troiano, Richard P.; Hammond, Jane A.; Phillips, Michael J.; Strader, Lisa C.; Marquez, David X.; Grant, Struan F.; Ramos, Erin

2012-01-01

324

Prediction of physical fitness and physical activity level in adulthood by physical performance and physical activity in adolescence--an 18-year follow-up study.  

PubMed

The aim of the study was to investigate relationships between physical fitness and self-reported physical activity in adulthood and to what extent the level of physical fitness and leisure-time physical activity in adulthood can be explained by anthropometric measures, physical performance, physical activity, attitudes to sports activities and socio-demographic characteristics at the age of 16. A group of 157 men and 121 women was tested at the ages of 16 and 34 by means of questionnaires and fitness tests. Physically active men and women had higher estimated VO2 max and performed better in curl ups and bench press than those who were inactive. Performance in physical tests, height, weight and physical activity at the age of 16 contributed best to explain adult physical performance and physical activity. The magnitude of explanation varied between 10% (9-min run test) and 56% (bench press test); it was in general lower in the men than in the women. The various fitness tests and physical activity were explained by different predictors and the predictors also differed between men and women. The findings about attitudes to sports and socio-demographic factors at a young age that influence adult physical activity habits and fitness are very complex and further research is required to identify specific inactivity risks. PMID:9809389

Barnekow-Bergkvist, M; Hedberg, G; Janlert, U; Jansson, E

1998-10-01

325

Contributions of chemistry in early day Los Alamos  

Microsoft Academic Search

During 1943--1945, the premier physics laboratory in the world was at Los Alamos, but chemistry contributions were vital. Major chemical impacts on the success of the Los Alamos wartime mission included electrochemistry, which found the true melting point of plutonium metal to be hundreds of degrees lower than anticipated. This discovery had profound simplifying effects regarding crucibles to contain molten

R. A. Penneman; R. A. Meade

1990-01-01

326

PREFACE: 15th Russian Youth Conference on Physics and Astronomy (PhysicA.SPb)  

NASA Astrophysics Data System (ADS)

The fifteenth Russian Youth Conference on Physics and Astronomy PhysicA.SPb was held 23-24 October 2012 in Saint-Petersburg, Russia. The Conference continues the tradition of Saint-Petersburg Seminars on Physics and Astronomy originating from the mid-90s. The main feature of PhysicA.SPb since then, remains the combination of both scientific and educational quality of the contributions delivered to the young audience. This feature makes it possible to combine the whole spectrum of modern Physics and Astronomy within one conference. PhysicA.SPb 2012 has brought together more than 150 students, young scientists and their professors from many universities and research institutes across Russia, as well as from Belarus, Ukraine, Finland, France and the United Kingdom. Oral and poster presentations were combined into a few well-defined sections among which one should name Astronomy and Astrophysics, Physics of semiconductors, Physics of solid state, Physics and technology of the alternative energetics, Nanostructured and thin-film materials, THz and UHF materials and devices, and Physics of the quantum-sized structures. This issue of the Journal of Physics: Conference Series presents the extended contributions from participants of PhysicA.SPb 2012 that were peer-reviewed by expert referees through processes administered by the Presiders of the Organising and Programme Committees to the best professional and scientific standards. Grigorii S. Sokolovskii and Nikita S. Averkiev Editors

Sokolovskii, Grigorii; Averkiev, Nikita

2013-08-01

327

Physics with Taus at CDF  

SciTech Connect

In this contribution, the authors describe the hadronic tau reconstruction and identification procedures adopted by the CDF experiment at Fermilab and present an overview of physics studies using tau leptons that are underway at CDF. Recent results using data obtained from Run II of the Tevatron are presented and include precision electroweak measurements as well as studies aimed at beyond Standard Model searches for new particles and interactions.

Safonov, Alexei; /UC, Davis

2004-12-01

328

Physics results from polarized DIS.  

SciTech Connect

We have extracted polarized nucleon distributions from recent data at CERN, SLAC and DESY. The flavor-dependent valence and sea quark spin distributions are determined for each experiment. We take into account possible differences in the up and down sea distributions, and assume that the strange sea contribution is suppressed by mass effects. Physics results determined from different experiments are compared, including higher order corrections.

Ramsey, G. P.

1998-03-23

329

The Other Hall Effect: College Board Physics  

NASA Astrophysics Data System (ADS)

Edwin Herbert Hall (1855-1938), discoverer of the Hall effect, was one of the first winners of the AAPT Oersted Medal for his contributions to the teaching of physics. While Hall's role in establishing laboratory work in high schools is widely acknowledged, his position as chair of the physics section of the Committee on College Entrance Requirements was contentious and his involvement in launching College Board Physics, what we call the ``other Hall effect,'' has largely been overlooked.1 This article details Hall's role in the development of College Board Physics.

Sheppard, Keith; Gunning, Amanda M.

2013-09-01

330

Women in Physics in the United States  

NASA Astrophysics Data System (ADS)

The underrepresentation of women in physics and related fields in the US remains significant despite an increase in doctoral degrees earned over the past 10 years. An even greater disparity is seen among minority women. Increasing recognition of the contributions of women to discovery and education in physics and related fields has led to government initiatives and other programs to promote broader inclusion, balance, and gender equity. These actions for advocating women in physics in the US since the first IUPAP Women in Physics Conference in 2002 are presented.

Zastavker, Yevgeniya V.; Gueye, Paul; Mack, Kelly M.; Ivie, Rachel; Simmons, Elizabeth H.; Santos, Lea F.; Martínez-Miranda, Luz J.; Bienenstock, Arthur; Blickenstaff, Jacob Clark; Horton, K. Renee; MacLachlan, Anne J.; Berrah, Nora; Hartline, Beverly K.

2009-04-01

331

Top Quark Physics at the Tevatron  

SciTech Connect

The authors review the field of top-quark physics with an emphasis on experimental techniques. The role of the top quark in the Standard Model of particle physics is summarized and the basic phenomenology of top-quark production and decay is introduced. They discuss how contributions from physics beyond the Standard model could affect the top-quark properties or event samples. The many measurements made at the Fermilab Tevatron, which test the Standard model predictions or probe for direct evidence of new physics using the top-quark event samples, are reviewed here.

Deliot, Frederic; /DAPNIA, Saclay; Glenzinski, Douglas A.; /Fermilab

2010-10-01

332

Physics Based University Courses  

ERIC Educational Resources Information Center

|Two physics courses which serve as alternatives to general college courses in physics are outlined: physics with astrophysics and physics with electronics. Details are given of the structure of the courses and third year options are specified. (DT)|

Beeby, J. L.

1974-01-01

333

Physical Activity (Exercise)  

MedlinePLUS

Home > Publications > Our publications > Our publications Publications Physical activity (exercise) fact sheet How can physical activity improve my health? How much physical activity should I do? How much physical activity do ...

334

Physical Activity for Everyone  

MedlinePLUS

... Nutrition Heart Disease Stroke Physical Activity How much physical activity do you need? Regular physical activity helps ... activities each week. It's easier than you think! Physical Activity Guidelines Children 6 to 17 years of ...

335

Physics Based University Courses  

ERIC Educational Resources Information Center

Two physics courses which serve as alternatives to general college courses in physics are outlined: physics with astrophysics and physics with electronics. Details are given of the structure of the courses and third year options are specified. (DT)

Beeby, J. L.

1974-01-01

336

Challenging stereotypes: Muslim girls talk about physical activity, physical education and sport  

Microsoft Academic Search

Often labelled as ‘problematic’ within health and physical education (HPE) and sporting literature, young Muslim women's participation is frequently understood through both cultural and religious limitations seen to be placed upon them. Although these factors are negotiated by many young Muslim women, and contribute to the way in which some will understand and participate in physical activity, it would be

Kelly Knez; Doune Macdonald; Rebecca Abbott

2012-01-01

337

Physical Education's Fourth Domain: Physical Fitness  

ERIC Educational Resources Information Center

|The Surgeon General's report discusses the importance of daily physical activity and addresses the role of schools' physical education programs in implementing activity into every child's life. Professionals in the physical education field have typically used three domains to address the physical education curriculum: motor, cognitive, and…

Beaudet, Bob; Acquaviva, John

2005-01-01

338

Physical Education's Fourth Domain: Physical Fitness  

ERIC Educational Resources Information Center

The Surgeon General's report discusses the importance of daily physical activity and addresses the role of schools' physical education programs in implementing activity into every child's life. Professionals in the physical education field have typically used three domains to address the physical education curriculum: motor, cognitive, and…

Beaudet, Bob; Acquaviva, John

2005-01-01

339

Gender and Physics: Feminist Philosophy and Science Education  

ERIC Educational Resources Information Center

Physics education reform movements should pay attention to feminist analyses of gender in the culture of physics for two reasons. One reason is that feminist analyses contribute to an understanding of a "chilly climate" women encounter in many physics university departments. Another reason is that feminist analyses reveal that certain styles of…

Rolin, Kristina

2008-01-01

340

Research on Effective Teaching in Elementary School Physical Education  

Microsoft Academic Search

The perspective of this article is that the purpose of the elementary physical education program is the development of a physically active lifestyle. We discuss the relative contribution of the development of motor skills, fitness, content related to encouraging participation, and the affective goals of the program to the development of a physically active lifestyle. Teaching must be effective if

Judith E. Rink; Tina J. Hall

2008-01-01

341

From students to researchers: The education of physics graduate students  

Microsoft Academic Search

This dissertation aims to make two research contributions: (1) In physics education research, this work aims to advance our understanding of physics student learning at the graduate level. This work attempts to better understand how physics researchers and teachers are produced, and what factors support or encourage the process of becoming a researcher and a teacher. (2) In cognitive science

Yuhfen Lin

2008-01-01

342

Physical and digital media usage patterns on interactive tabletop surfaces  

Microsoft Academic Search

Concurrent interaction with physical and digital media is ubiquitous in knowledge work. Although tabletop systems increasingly support activities involving both physical and digital media, patterns of use have not been systematically assessed. This paper contributes the results of a study of spatial usage patterns when physical and digital items are grouped and sorted on a tabletop work surface. In addition,

Jürgen Steimle; Mohammadreza Khalilbeigi; Max Mühlhäuser; James D. Hollan

2010-01-01

343

The evolution of physical activity recommendations: how much is  

Microsoft Academic Search

ABSTRACT Physical inactivity is a major public health problem, and compelling evidence suggests that it is a contributing factor in several chronic diseases and conditions. Recognition of the health and functional hazards of a sedentary way of life has led numerous,groups to pro- mulgate public health recommendations,for physical activity. In this report, we review the evolution of physical activity recommenda-

Steven N Blair; Michael J Lamonte; Milton Z Nichaman

344

Physics and Biology: Bio-plasma physics  

NASA Astrophysics Data System (ADS)

The purpose of this paper is to show that plasma physics can be useful in the investigation of the physical properties of living cells. Concepts like charge neutrality, Debye length, and double layer are very useful to explain the electrical properties of a cellular membrane. It is hoped that examples of physics applications to biology can be useful in giving students of physics courses new motivations to study physics and to carry out interdisciplinary studies. This paper can be easily understood by students of physics courses with no previous knowledge of plasma physics or biology.

Uehara, Mituo; Sakane, Kumiko K.; Maciel, Homero S.; Urruchi, Wilfredo I.

2000-05-01

345

Nonaccelerator physics working group summary  

SciTech Connect

The Nonaccelerator Physics Working Group set itself the task of predicting the contributions of nonaccelerator experiments to particle physics during the 1990s, in order to assess the needs for new experimental facilities. The main topics studied by the subgroups were: (1) the possibility of doing particle physics experiments with high energy cosmic rays from astrophysical sources; (2) the prospects for experiments which seek to measure the masses of neutrinos and the mixing of neutrino flavors; (3) an examination of the implications for proton decay of recent theoretical developments in grand unified and string theories. Other topics included a survey of magnetic monopole searches, an assessment of future prospects for double-beta-decay and nucleon-decay experiments, and a review of recent progress on neutrino and dark-matter detectors based on quasiparticles in superconductors and phonons in crystals.

Ayres, D.S.; Beier, E.W.; Cherry, M.L.; Marciano, W.J.

1986-01-01

346

Measuring Physical Activity in Peripheral Arterial Disease: A Comparison of Two Physical Activity Questionnaires with an Accelerometer  

Microsoft Academic Search

Peripheral arterial disease (PAD)-related exertional leg pain may limit physical activity, thereby contributing to mobility loss and increasing cardiovascular morbidity and mortality in men and women with PAD. The objectives of this study were: (1) to compare objectively measured physical activity levels between patients with and without PAD, (2) to assess the validity of two physical activity questionnaires in patients

Kiang Liu; Erin OBrien; Jack M. Guralnik; Michael H. Criqui; Gary J. Martin; Philip Greenland; Mary McGrae McDermott

2000-01-01

347

Contributions from the CYGNUS/Milagro Collaboration  

SciTech Connect

This document consists of eleven reports contributed to the XXIV International Cosmic Ray Conference (Rome, Italy, August 28--September 8, 1995) from the CYGNUS/Milagro Collaboration: ``Search for Ultra-High-Energy Radiation from Gamma-Ray Bursts``, ``Gamma-Ray Bursts: Detection and Distance Estimates with Milagro``, ``Searching for Gamma-Ray Bursts with Water-Cerenkov-Detector Single-Particle Rates``, ``The Milagro Detector``, ``The Milagro Data Acquisition System``, ``Source Searches Using the CYGNUS Water-Cerenkov Array``, ``Search for UHE Emission from Supernova Remnants``, ``Solar Physics with the Milagro Telescope``, ``An Experiment to Detect Correlations Between Cerenkov and Muon Lateral Distributions in EAS``, ``A Study of Large-Zenith-Angle Air Showers with the CYGNUS Experiment``, and ``Mass Resolution of Ground Based Air Shower Experiments in the 10 to 10000 TeV range.``

Allen, G.E.; Chang, C.Y.; Chen, M.L.

1995-09-01

348

Soft contributions to hard pion photoproduction  

SciTech Connect

Hard, or high transverse momentum, pion photoproduction can be a tool for probing the parton structure of the beam and target. We estimate the soft contributions to this process, with an eye toward delineating the region where perturbatively calculable processes dominate. Our soft process estimate is based on vector meson dominance and data based parametrizations of semiexclusive hadronic cross sections. We find that soft processes dominate in single pion photoproduction somewhat past 2 GeV transverse momentum at a few times 10 GeV incoming energy. The recent polarization asymmetry data are consistent with the perturbative asymmetry being diluted by polarization insensitive soft processes. Determining the polarized gluon distribution using hard pion photoproduction appears feasible with a few hundred GeV of incoming energy (in the target rest frame). (c) 2000 The American Physical Society.

Afanasev, Andrei [Department of Physics, North Carolina Central University, Durham, North Carolina 27707 (United States); Thomas Jefferson National Accelerator Facility, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States); Carlson, Carl E. [Nuclear and Particle Theory Group, Physics Department, College of William and Mary, Williamsburg, Virginia 23187-8795 (United States); Wahlquist, Christian [Nuclear and Particle Theory Group, Physics Department, College of William and Mary, Williamsburg, Virginia 23187-8795 (United States)

2000-02-01

349

Mesures en temps réel par diffusion de neutrons aux petits angles (DNPA) avec un appareil à ``flux stoppé'' (stopped-flow)  

NASA Astrophysics Data System (ADS)

La nouvelle génération de diffractomètres à haut flux pour la diffusion de neutrons aux petits angles, comme D22 à l'ILL, ouvre de nouvelles perspectives avec les expériences “temps réel” et les “cinétiques rapides”. “Temps réel” signifie un film de l'échantillon après une perturbation, par exemple un saut en température, une variation de pH, une dilution, un mélange ou encore l'application d'un champ magnétique. Par “rapide” on entend des temps d'acquisition courts, de l'ordre de quelques centaines de millisecondes pour suivre les toutes premières étapes de formation et d'organisation de l'échantillon. La connaissance d'éventuelles phases intermédiaires peut être cruciale pour comprendre les propriétés de l'échantillon dans son état d'équilibre. Pour ces expériences, un appareil à flux stoppé (Bio-Logic^TM) a été spécialement adapté pour la DNPA. Il permet de mélanger rapidement deux à trois solutions en contrôlant précisement les volumes et les temps de mélanges puis de démarrer l'observation en connaissant le délai après le début de la réaction. Cette nouvelle technique a été utilisée pour suivre la croissance de vésicules formées après dilution de micelles d'AOT par une solution saline. Le moteur de la croissance est l'écrantage des répulsions électrostatiques entre les têtes polaires tensioactives, ce qui favorise la formation d'une bicouche localement plane.

Grillo, I.

2005-11-01

350

How can laboratory plasma experiments contribute to space and &astrophysics?  

NASA Astrophysics Data System (ADS)

Plasma physics plays key role in a wide range of phenomena in the universe, from laboratory plasmas to the magnetosphere, the solar corona, and to the tenuous interstellar and intergalactic gas. Despite the huge difference in physical scales, there are striking similarities in plasma behavior of laboratory and space plasmas. Similar plasma physics problems have been investigated independently by both laboratory plasma physicists and astrophysicists. Since 1991, cross fertilization has been increased among laboratory plasma physicists and space physicists through meeting such as IPELS [Interrelationship between Plasma Experiments in the Laboratory and Space] meeting. The advances in laboratory plasma physics, along with the recent surge of astronomical data from satellites, make this moment ripe for research collaboration to further advance plasma physics and to obtain new understanding of key space and astrophysical phenomena. The recent NRC review of astronomy and astrophysics notes the benefit that can accrue from stronger connection to plasma physics. The present talk discusses how laboratory plasma studies can contribute to the fundamental understandings of the space and astrophysical phenomena by covering common key physics topics such as magnetic reconnection, dynamos, angular momentum transport, ion heating, and magnetic self-organization. In particular, it has recently been recognized that "physics -issue- dedicated" laboratory experiments can contribute significantly to the understanding of the fundamental physics for space-astrophysical phenomena since they can create fundamental physics processes in controlled manner and provide well-correlated plasma parameters at multiple plasma locations simultaneously. Such dedicated experiments not only can bring about better understanding of the fundamental physics processes but also can lead to findings of new physics principles as well as new ideas for fusion plasma confinement. Several dedicated experiments have provided the fundamental physics data for magnetic reconnection [1]. Linear plasma devices have been utilized to investigate Whistler waves and Alfven wave phenomena [2,3]. A rotating gallium disk experiment has been initiated to study magneto-rotational instability [4]. This talk also presents the most recent progress of these dedicated laboratory plasma research. 1. M. Yamada et al., Phys. Plasmas 4, 1936, (1997) 2. R. Stenzel, Phys. Rev. Lett. 65, 3001 (1991) 3. W. Gekelman et al, Plasma Phys. Contr. Fusion, v42, B15-B26, Suppl.12B (2000) 4. H. Ji, J. Goodman, A. Kageyama Mon. Not. R. Astron. Soc. 325, L1- (2001)

Yamada, M.

351

PREFACE: 31st European Physical Society Conference on Plasma Physics  

NASA Astrophysics Data System (ADS)

This special issue of Plasma Physics and Controlled Fusion comprises refereed papers contributed by invited speakers at the 31st European Physical Society Conference on Plasma Physics. The conference was jointly hosted by the Rutherford Appleton Laboratory, by the EURATOM/UKAEA Fusion Association and by Imperial College London, where it took place from 28 June to 2 July 2004. The overall agenda for this conference was set by the Board of the Plasma Physics Division of the European Physical Society, chaired by Friedrich Wagner (MPIPP, Garching) and his successor Jo Lister (CRPP, Lausanne). It built on developments in recent years, by further increasing the scientific diversity of the conference programme, whilst maintaining its depth and quality. A correspondingly diverse Programme Committee was set up, whose members are listed below. The final task of the Programme Committee has been the preparation of this special issue. In carrying out this work, as in preparing the scientific programme of the conference, the Programme Committee formed specialist subcommittees representing the different fields of plasma science. The chairmen of these subcommittees, in particular, accepted a very heavy workload on behalf of their respective research communities. It is a great pleasure to take this opportunity to thank: Emilia R Solano (CIEMAT, Madrid), magnetic confinement fusion; Jürgen Meyer-ter-Vehn (MPQ, Garching), laser-plasma interaction and beam plasma physics; and Jean-Luc Dorier (CRPP, Lausanne), dusty plasmas. The relatively few papers in astrophysical and basic plasma physics were co-ordinated by a small subcommittee which I led. Together with Peter Norreys (RAL, Chilton), we five constitute the editorial team for this special issue. The extensive refereeing load, compressed into a short time interval, was borne by the Programme Committee members and by many other experts, to whom this special issue owes much. We are also grateful to the Local Organizing Committee chaired by Henry Hutchinson (RAL, Chilton), and to the Plasma Physics and Controlled Fusion journal team (Institute of Physics Publishing, Bristol), for their work on this conference. At the 2004 European Physical Society Conference on Plasma Physics, plenary invited speakers whose talks spanned the entire field were followed, each day, by multiple parallel sessions which also included invited talks. Invited speakers in both these categories were asked to contribute papers to this special issue (the contributed papers at this conference, and at all recent conferences in this series, are archived at http://epsppd.epfl.ch). The Programme Committee is very grateful to the many invited speakers who have responded positively to this request. Invited papers appear here in their order of presentation during the week beginning 28 June 2004; this ordering provides an echo of the character of the conference, as it was experienced by those who took part. Programme Committee 2004 Professor Richard Dendy UKAEA Culham Division, UK Chairman and guest editor Dr Jean-Luc Dorier Centre de Recherches en Physique des Plasmas, Lausanne, Switzerland (Co-ordinator of dusty plasmas and guest editor) Professor Jürgen Meyer-ter-Vehn Max-Planck-Institut für Quantenoptik, Garching, Germany (Co-ordinator of laser-plasma interaction and beam plasma physics and guest editor) Dr Peter Norreys Rutherford Appleton Laboratory, Chilton, UK (Scientific Secretary and guest editor) Dr Emilia R Solano CIEMAT Laboratorio Nacional de Fusión, Madrid, Spain ( Co-ordinator of magnetic confinement fusion and guest editor) Dr Shalom Eliezer Soreq Nuclear Research Centre, Israel Dr Wim Goedheer FOM-Instituut voor Plasmafysica, Rijnhuizen, Netherlands Professor Henry Hutchinson Rutherford Appleton Laboratory, Chilton, UK Professor John Kirk Max-Planck-Institut für Kernphysik, Heidelberg, Germany Dr Raymond Koch Ecole Royale Militaire/Koninklijke Militaire School, Brussels, Belgium Professor Gerrit Kroesen Technische Universiteit Eindhoven, Netherlands Dr Martin Lampe Naval Research Laboratory, Washington DC,

Dendy, Richard

2004-12-01

352

Resilience Significantly Contributes to Exceptional Longevity  

PubMed Central

Objective. We aim to investigate whether centenarians are significantly more resilient than younger elders and whether resilience significantly contributes to exceptional longevity. Data. We use a unique dataset from the Chinese Longitudinal Healthy Longevity Survey with the largest sample to date of centenarians, nonagenarians, octogenarians, and a compatible group of young old aged 65–79. Methods and Results. Logistic regressions based on the cross-sectional sample show that after controlling for various confounders, including physical health and cognitive status, centenarians are significantly more resilient than any other old-age group. Logistic regression analyses based on the longitudinal data show that nonagenarians aged 94–98 with better resilience have a 43.1% higher likelihood of becoming a centenarian compared to nonagenarians with lower resilience. Conclusions. Resilience significantly contributes to longevity at all ages, and it becomes even more profound at very advanced ages. These findings indicate that policies and programs to promote resilience would have long-term and positive effects on the well-being and longevity for senior citizens and their families.

Zeng, Yi; Shen, Ke

2010-01-01

353

Selected Contributions to the Literature of Blood Groups and Immunology. Volume IV. Part 1: Anthropologic Data.  

National Technical Information Service (NTIS)

Certain recent arguments against the application of genetical methods in physical anthropology are examined, and 4 examples are offered of contributions made by such methods: (a) confirming the Indian origin of Gypsies; (b) computing the percent of White ...

1971-01-01

354

Using internet assessment tools for health and physical education instruction  

Microsoft Academic Search

Conclusions  Physical education should provide opportunities for students to participate in activities that promote fitness and well-being.\\u000a Implementing best practices into the physical education curriculum can contribute to the understanding and application of\\u000a a healthy lifestyle for students. Technology applied in the physical education curriculum can provide an opportunity for improved\\u000a instruction and enhanced student learning in physical education. The current

Roland Thornburg; Kory Hill

2004-01-01

355

Improving Learning for Underrepresented Groups in Physics for Engineering Majors  

NSDL National Science Digital Library

The Extended Analytical Physics course at Rutgers University was crafted to improve learning in the first-year physics course for students mathematically under-prepared for engineering physics. It is a core course in the engineering curriculum and has contributed to the increase in success of underrepresented groups in physics and in subsequently in STEM majors. This article describes the evolution of this course, its current structure, the successes measured and the future plans.

Brahmia, Suzanne

2008-09-15

356

Physics News in 1983.  

ERIC Educational Resources Information Center

|Information is provided on some of the interesting and newsworthy developments in physics and its related fields during 1983. Areas considered include: (1) acoustics; (2) astrophysics; (3) condensed matter physics; (4) crystallography; (5) physics education; (6) electron and atomic physics; (7) elementary particle physics; (8) fluid dynamics; (9)…

Schewe, Phillip F., Ed.

357

Physics News in 1983.  

ERIC Educational Resources Information Center

Information is provided on some of the interesting and newsworthy developments in physics and its related fields during 1983. Areas considered include: (1) acoustics; (2) astrophysics; (3) condensed matter physics; (4) crystallography; (5) physics education; (6) electron and atomic physics; (7) elementary particle physics; (8) fluid dynamics; (9)…

Schewe, Phillip F., Ed.

358

The Future of Theoretical Physics and Cosmology  

NASA Astrophysics Data System (ADS)

Based on lectures given in honor of Stephen Hawking's 60th birthday, this book comprises contributions from the world's leading theoretical physicists. Popular lectures progress to a critical evaluation of more advanced subjects in modern cosmology and theoretical physics. Topics covered include the origin of the universe, warped spacetime, cosmological singularities, quantum gravity, black holes, string theory, quantum cosmology and inflation. The volume provides a fascinating overview of the variety of subjects to which Stephen Hawking has contributed.

Gibbons, G. W.; Shellard, E. P. S.; Rankin, S. J.

2003-11-01

359

BOOK REVIEW: Complete Physics  

NASA Astrophysics Data System (ADS)

This book contains all the essential concepts for GCSE (or equivalent) physics courses or for general science courses at Key Stage 4. It claims to be ideal for use as a bridging resource for those intending to take physics beyond GCSE: it is no surprise, then, that the book is written at a level above that of the average Key Stage 4 student. It includes material not included in many GCSE syllabuses; this is clearly identified in the contents pages. It would be a useful resource for more able students at GCSE or for beginning A-level students. The layout of the book is attractive. It is well illustrated and colourful. Some of the illustrations are striking: each of the 12 main sections of the book begins with a title page that includes some unusual photographs illustrating physical ideas. Section 2, Forces and Motion, has a photograph of a bungee jumper leaping from the Sky Tower in New Zealand, taken at night looking along the length of the tower from its foot. Section 9, Magnets and Currents, has a computer-generated picture of the magnetic field in a fusion generator. These pictures, as well as contributing to the attractiveness of the book, could be used to initiate discussions of some of the physics. However, there are pictures that serve little useful purpose: a photograph of a recording station for seismic waves looks like any other building lit up at night. A photograph of a rock band in the middle of a section on sound carries no explanatory caption at all and is purely decorative. Other illustrations - in a variety of styles - do illustrate some physical ideas very well: the diagrams of motors and generators, for instance, are far clearer than my efforts on the blackboard! The book is divided into 14 sections with titles reflecting the traditional divisions of physics syllabuses, together with a beginning section on measurement and units and two final sections, `History of Key Ideas' and `Experimental Physics'. The first section, `Measurement and Units', begins with an emphasis on the correct use of units in calculations that is very good (although again only really appropriate for more able students) and considers scientific notation and SI units. The use of triangles for rearranging three variable equations is introduced without any discussion of how to do the algebra properly. I found this rather out of place in a book of this level; I should personally hope to see those intending to pursue the subject beyond GCSE capable of rearranging equations without recourse to methods which convey no understanding of the physical relationship. The section on the `History of Key Ideas' has a double page spread on `Forces, Motion and Energy', `Rays, Waves and Particles' and `The Earth and Beyond', followed by a chronology of physics from 400 BC to 1990. These sections are necessarily very brief. The final section, `Experimental Physics', has some useful reminders for students about investigative work and a photocopiable checklist. The book has some very attractive features. Most pages include a boxed list of `essentials' that are useful either in skimming the text to find useful information or in revision. Each double page spread into which the material is arranged includes some fairly straightforward questions to test the basic ideas. Each section ends with a set of examination questions and with a checklist of ideas that can be photocopied for students to tick off what has been covered. The contents pages of the book may also be photocopied for students to check their progress. Given that this is a brand new book, I found the inclusion of a spread on ticker-tape rather old-fashioned: video is a much better way of analysing motion. The language of the text, too, can be rather dry and academic, and the organization reflects a traditional approach to the physics curriculum. The book would be most useful, I think, to able students studying single-subject physics courses at GCSE or to those beginning A-level. At £14.00 a copy, it is too expensive for me to use within a coordinated science scheme. The spreads provide usefu

Carson, Simon

2000-03-01

360

Learning Many-Body Physics with Adelchi  

NASA Astrophysics Data System (ADS)

We present an overview of the contributions that Adelchi Fabrocini gave to the field of many-body physics during the last thirty years. He has left us while he was still in full activity, and his work, which is certainly a reference for all of us, will motivate and guide the work of future research in many-body physics for a long time.

Benhar, O.; Co', G.; Polls, A.

2007-04-01

361

Physics Matters: An Introduction to Conceptual Physics  

Microsoft Academic Search

From amusement park rides to critical environmental issues such as energy generation-physics affects almost every aspect of our world. In PHYSICS MATTERS, James Trefil and Robert Hazen examine the fundamental physics principles at work behind the many practical applications that fuel our society and individual lives. Their goal is to promote a deeper understanding of how the great ideas of

James Trefil; Robert M. Hazen

2003-01-01

362

Physical Activity Promotion and School Physical Education.  

ERIC Educational Resources Information Center

|This report examines school physical education (PE) and how it can be an important part of the national physical activity promotion effort. Section 1 introduces the issue of youth activity and PE, noting that schools and universities must reintroduce daily, quality physical activity as a key component of comprehensive education. Section 2…

Morrow, James R., Jr.; Jackson, Allen W.; Payne, V. Gregory

1999-01-01

363

A-level Physics: Medical Physics  

Microsoft Academic Search

One of the advantages of the new crop of A-level syllabuses has been the introduction of optional material allowing students to probe into new territory as well as maintaining some deeper exploration along well-worn pathways. Medical physics has proved a very popular topic; several syllabuses include sections on the physics of the human body, and on the physics of diagnosis

Christine Stone

1996-01-01

364

Some Physics Not in the Physical Review.  

ERIC Educational Resources Information Center

|Discusses how physics was done at the University of California at Berkeley in the 1930s, focusing on the faculty and their accomplishments, physics experiments, physics instruments/equipment (cyclotron and rhumbatron), and research problems and their solutions. Includes reminiscences about lectures on thermodynamics presented by Otto Stern during…

Varney, Robert N.

1982-01-01

365

Teaching plasma physics with computational physics  

Microsoft Academic Search

A senior level course in either plasma physics or in numerical methods may not interest enough students to satisfy The Dean, however, a combined course of one-semester has been found to generate sufficient enrollment. Plasma physics is particularly well-suited for marriage with numerical methods, however, a combined course requires omitting some plasma physics topics. The computational part of the course

Scott Robertson

2005-01-01

366

Supporting Enterprise. A College Contribution.  

ERIC Educational Resources Information Center

|This report describes the experience of one college--Percival Whitley College in Calderdale, England--in contributing to the strategy for economic regeneration of the surrounding metropolitan district. It charts the success of the borough and the college working together to attract national and European funding. A checklist for implementing…

Bolton, John F.; Cook, David

367

A Treatise of Taxes & Contributions  

Microsoft Academic Search

A Treatise of Taxes & Contributions, shewing the Nature and Measures of Crown Lands, Assessments, Customs, Poll-Money, Lotteries, Benevolence, Penalties, Monopolies, Offices, Tythes, Raising of Coins, Harth-Money, Excize, etc. With several intersperst Discourses and Digressions concerning Warres, The Church, Universities, Rents & Purchases, Usury & Exchange, Banks & Lombards, Registries for Conveyances, Beggars, Ensurance, Exportation of Money & Wool, Free-ports,

William Petty

368

British contribution to knee arthroplasty.  

PubMed

British surgeons and engineers contributed various types of knee prostheses, including hinged, unconstrained, and semiconstrained prostheses, in the development of total knee arthroplasty. Methods of implant fixation, the place of stems, pegs, the use of special instrumentation, and alignment procedures ensure both intrinsic and extrinsic prosthetic stability. PMID:3530580

Freeman, M A; Levack, B

1986-09-01

369

Knowing your contribution to climate  

Microsoft Academic Search

Challenging issues such as greenhouse gas emissions and Climate Change may seem very remote, but there are ways that can help to better perceive our contribution to such problems. And that is where a new mobile application - mobGAS© - comes into play. mobGAS© will be the first mobile application about climate change with wide distribution in Europe and world.

I. Crespo

2009-01-01

370

Recent Langley helicopter acoustics contributions  

Microsoft Academic Search

The helicopter acoustics program at NASA Langley has included technology for elements of noise control ranging from sources of noise to receivers of noise. The scope of Langley contributions for about the last decade is discussed. Specifically, the resolution of two certification noise quantification issues by subjective acoustics research, the development status of the helicopter system noise prediction program ROTONET

Homer G. Morgan; S. P. Pao; C. A. Powell

1988-01-01

371

Contributions of chemistry in early day Los Alamos  

SciTech Connect

During 1943--1945, the premier physics laboratory in the world was at Los Alamos, but chemistry contributions were vital. Major chemical impacts on the success of the Los Alamos wartime mission included electrochemistry, which found the true melting point of plutonium metal to be hundreds of degrees lower than anticipated. This discovery had profound simplifying effects regarding crucibles to contain molten plutonium and on its production. Other significant chemical contributions involved constant purification of plutonium for reuse, producing carrier-free gamma sources at unprecedented kilo-curie levels, and high polonium work. 8 refs.

Penneman, R.A.; Meade, R.A.

1990-01-01

372

Her physics, his physics: gender issues in Israeli advanced placement physics classes  

NASA Astrophysics Data System (ADS)

Gender gaps in physics in favour of boys are more prominent in Israel than in other countries. The main research question is to find out what gender issues are at play in Israeli advanced placement physics classes. Matriculation exam scores from approximately 400 high schools were analysed across 12 years. In addition, semi-constructed interviews were conducted with 50 advanced placement physics students (25 girls and 25 boys). In terms of participation, it was found that the ratio of girls to boys has been unchanged from 1988 to 2000 and is roughly 1:3. In terms of performance, it was found that the final matriculation scores of boys and girls are similar. However, breaking up the final scores into its two components - teachers' given grades and matriculation test scores - showed that boy's test scores are usually higher than girls' test scores, while girls' teachers' given grades are usually higher than boys'. Results from semi-constructed interviews pointed to two factors that are especially unfavourable to many girls: excessive competitiveness and lack of teaching for understanding. Girls' yearning for deep understanding is seen as a form of questing for connected knowledge. It is suggested that instructional methods that foster students' understanding while decreasing competitiveness in physics classes might contribute to girls' participation and performance in advanced physics classes while also supporting the learning of many boys.

Zohar, Anat

2003-02-01

373

Quantum Physics for Beginners.  

ERIC Educational Resources Information Center

|Suggests a new approach for teaching secondary school quantum physics. Reviews traditional approaches and presents some characteristics of the three-part "Quantum Physics for Beginners" project, including: quantum physics, quantum mechanics, and a short historical survey. (SK)|

Strand, J.

1981-01-01

374

Guide to Physical Activity  

MedlinePLUS

... Families ( We Can! ) Health Professional Resources Guide to Physical Activity Physical activity is an important part of ... to injury. Examples of moderate-intensity amounts of physical activity Common Chores Washing and waxing a car ...

375

Navy Physical Conditioning Guide.  

National Technical Information Service (NTIS)

Increasing daily physical activity is the first step toward greater physical fitness, especially if you have been inactive. If you have been sedentary you cannot expect your fitness to improve overnight with a sudden increase in physical activity. Instead...

E. Marcinik

1989-01-01

376

Cartographie de l'elevation de l'interface eau douce-eau salee aux iles-de-la-madeleine par la methode electromagnetique transitoire (TEM)  

NASA Astrophysics Data System (ADS)

This research project is dedicated to mapping the elevation of the freshwater-saltwater interface in Magdalen Islands using the transient electromagnetic method (TEM) in order to monitor time-varying quality of groundwater tables. Seventy-three TEM soundings were conducted between May 2010 and June 2011 close to Well regions in Fatima, Étang-du-Nord, Havre-Aux-Maisons, Grande-Entrée and Grosse-Île. TEM soundings were carried out with loops of 50 m x 50 m and 60 m x 40 m x 2 turns except some surveys of 100 m x 100 m. To control water quality and help constrain the interpretation of TEM soundings, conductivity logs were made in four previous exploration wells and fifteen wells drilled in 2009. Results show that saline water is associated with a low resistivity level between 2 and 4 ?.m and its elevation ranges from -40 m at Grand-Entrée and more than -250 m at Havre-Aubert. In Étang-du-Nord east, Fatima east and Grande-Entrée, saline water is shallow near shore and plunges inward as expected by the Ghyben Herzberg relation. These three areas have been identified to achieve the time-lapse monitoring of groundwater because of the risk associated with the proximity of wells in operation and the low elevation of saline water. Fatima center area close to FAT03 and FAT07 soundings and Havre-Aux-Maisons showed inconsistent results with the hydrogeological model, further work is recommended to verify the origin of the conductive areas highlighted. However, the results of the interpretation of areas at Havre-Aubert and Grosse-Île did not show a risk of contamination due to the depth of saline water. Modeling of the transition zone between the freshwater aquifer and the saline groundwater has demonstrated that it was difficult to solve it for thicknesses below 10 m and 30 m to depths of 40 and 130 m respectively. If the resistivity of the transition zone is known, the resolution is improved (5 and 10 m respectively). TEM soundings showed negative responses at late time associated with induced polarization (IP) effects. The inversion results of TEM soundings affected by this effect have shown that this dispersion most likely originates from near-surface layers. Chargeabilities ranging from 0.8 to 0.9 were obtained on the TEM soundings processed. The origin of this chargeability is currently unknown but could be related to the presence of fine material (clay). IP effect has not prevented determination of the saline water to a maximum depth of 250 m. The laboratory tests on core samples were unfortunately not able to determine the relationship between resistivity and water resistivity of saturated red sandstone. Immersion of cores in deionized water failed to eliminate the salt present in it. For time-varying monitoring of groundwater, we recommend performing drilling through the interface between freshwater and saltwater on selected areas, to conduct conductivity logs to fully characterize the level of this interface, to install multiparameter probes (conductivity, temperature, pressure) in monitoring wells located at different levels and to locate sites of TEM soundings in the vicinity that will be used to monitor the groundwater.

Madani, Abdelhamid

377

Physics to Go  

NSDL National Science Digital Library

This is an online monthly magazine sponsored by the American Physical Society that integrates images and explanations of physics phenomena with breaking news in physics research. It is targeted for general audiences, teachers, and students with little background in physics. Users can search or browse a database of 900+ resources related to physical science, physics, and astronomy. The magazine's archives are available from its inception in 2006.

2006-06-29

378

Alumni Willingness to Give and Contribution Behavior  

Microsoft Academic Search

Investigates the effect of alumni ownership of university insignia goods and related alumni contribution behavior. Two distinct measures of alumni contribution behavior-willingness to give and actual contribution behavior-were used in this study. Willingness to give is a measure of the desire or sentiment to contribute. Contributions are behavioral manifestations of that sentiment. The results of the study indicate the importance

Gail Tom; Laura Elmer

1994-01-01

379

Teacher Education in Physics  

NSDL National Science Digital Library

This compendium of research articles on the preparation of physics and physical-science teachers is published by the Physics Teacher Education Coalition (PhysTEC). This book came about due to a need for improved preparation of physics and physical science teachers. This resulting book includes new reports that reflect cutting-edge research and practice, as well as reprints of previously published seminal papers from the body of research and research-based practice in physics teacher education. PhysTEC is a a project of the American Physical Society (APS) and American Association of Physics Teachers (AAPT).

2012-01-09

380

VLHC accelerator physics  

SciTech Connect

A six-month design study for a future high energy hadron collider was initiated by the Fermilab director in October 2000. The request was to study a staged approach where a large circumference tunnel is built that initially would house a low field ({approx}2 T) collider with center-of-mass energy greater than 30 TeV and a peak (initial) luminosity of 10{sup 34} cm{sup -2}s{sup -1}. The tunnel was to be scoped, however, to support a future upgrade to a center-of-mass energy greater than 150 TeV with a peak luminosity of 2 x 10{sup 34} cm{sup -2} sec{sup -1} using high field ({approx} 10 T) superconducting magnet technology. In a collaboration with Brookhaven National Laboratory and Lawrence Berkeley National Laboratory, a report of the Design Study was produced by Fermilab in June 2001. 1 The Design Study focused on a Stage 1, 20 x 20 TeV collider using a 2-in-1 transmission line magnet and leads to a Stage 2, 87.5 x 87.5 TeV collider using 10 T Nb{sub 3}Sn magnet technology. The article that follows is a compilation of accelerator physics designs and computational results which contributed to the Design Study. Many of the parameters found in this report evolved during the study, and thus slight differences between this text and the Design Study report can be found. The present text, however, presents the major accelerator physics issues of the Very Large Hadron Collider as examined by the Design Study collaboration and provides a basis for discussion and further studies of VLHC accelerator parameters and design philosophies.

Michael Blaskiewicz et al.

2001-11-01

381

Chronic physical illness: a psychophysiological approach for chronic physical illness.  

PubMed

Growing evidence demonstrates that psychological risk variables can contribute to physical disease. In an effort to thoroughly investigate potential etiological origins and optimal interventions, this broad review is divided into five sections: the stress response, chronic diseases, mind-body theoretical models, psychophysiological interventions, and integrated health care solutions. The stress response and its correlation to chronic disorders such as cardiovascular, gastrointestinal, autoimmune, metabolic syndrome, and chronic pain are comprehensively explored. Current mind-body theoretical models, including peripheral nerve pathway, neurophysiological, and integrative theories, are reviewed to elucidate the biological mechanisms behind psychophysiological interventions. Specific interventions included are psychotherapy, mindfulness meditation, yoga, and psychopharmacology. Finally, the author advocates for an integrated care approach as a means by which to blur the sharp distinction between physical and psychological health. Integrated care approaches can utilize psychiatric nurse practitioners for behavioral assessment, intervention, research, advocacy, consultation, and education to optimize health outcomes. PMID:23483831

Purdy, Jana

2013-03-12

382

How Can Sport Biomechanics Contribute to the Advance of World Record and Best Athletic Performance?  

ERIC Educational Resources Information Center

Modern history has evidence that sport biomechanics provide valuable contribution in the pursuit of "faster, higher, and stronger." In this article, the contribution of sport biomechanics to the Olympic Games has been divided into three different categories: improve the physical capacity of the athletes, develop innovative techniques in a given…

Li, Li

2012-01-01

383

How Can Sport Biomechanics Contribute to the Advance of World Record and Best Athletic Performance?  

ERIC Educational Resources Information Center

|Modern history has evidence that sport biomechanics provide valuable contribution in the pursuit of "faster, higher, and stronger." In this article, the contribution of sport biomechanics to the Olympic Games has been divided into three different categories: improve the physical capacity of the athletes, develop innovative techniques in a given…

Li, Li

2012-01-01

384

Activities Contributing to Total Energy Expenditure in the United States: Results from the NHAPS Study  

Microsoft Academic Search

BACKGROUND: Physical activity is increasingly recognized as an important factor influencing health and disease status. Total energy expenditure, both low-intensity and high-intensity, contributes to maintenance of healthy body weight. This paper presents the results of a quantitative approach to determining the activities that contribute to total energy expenditure in the United States. METHODS: Data from the National Human Activity Pattern

Linda Dong; Gladys Block; Shelly Mandel

2004-01-01

385

John Hunter's Contributions to Neuroscience  

Microsoft Academic Search

John Hunter was a giant in the natural sciences and medicine (Fig. 1). His overall contributions to the basic and clinical\\u000a neurosciences were substantial but are little known. One reason is because as a “naturalist” Hunter’s underlying emphasis\\u000a was upon the greater understanding of life itself, including paleontology and geology. His main interests were in the philosophy\\u000a of life and

James L. Stone; James T. Goodrich; George R. Cybulski

386

Moral distress in physical therapy practice.  

PubMed

The purpose of this article is to discuss the theoretical concept of moral distress in the context of current physical therapy practice and ethics knowledge and differentiate it from emotional distress and burnout. Moral distress, largely discussed in nursing, is a theoretical concept that has the potential to elucidate the experiences of physical therapists delivering direct care to patients in complex health care situations and to contribute to physical therapy ethics knowledge and education. It focuses attention on the role of moral agent and the ethical dimensions of practice, offers a basis for dialogue among health professionals, and promotes analysis of the impact of the organizational environment on practice. The article concludes by suggesting how an understanding of the concept of moral distress might inform existing physical therapy ethical decision-making models and future research directions by which the experience of moral distress in physical therapy might be explored. PMID:20067356

Carpenter, Christine

2010-02-01

387

The Role of Nuclear Physics in Understanding the Cosmos and the Origin of Elements  

NASA Astrophysics Data System (ADS)

This popular lecture, given in the conference celebrating contributions of Akito Arima to physics on the occasion of his 80th anniversary, outlines the role of nuclear physics in understanding the origin of elements.

Balantekin, A. B.

2011-05-01

388

The Role of Nuclear Physics in Understanding the Cosmos and the Origin of Elements  

SciTech Connect

This popular lecture, given in the conference celebrating contributions of Akito Arima to physics on the occasion of his 80th anniversary, outlines the role of nuclear physics in understanding the origin of elements.

Balantekin, A. B. [Physics Department, University of Wisconsin, Madison WI 53706 (United States)

2011-05-06

389

Physical Review Special Topics: Physics Education Research  

NSDL National Science Digital Library

How do people learn about physics? It's an important topic, especially as many countries seek to train a new generation of physicists. The Physical Review Special Topics: Physics Education Research (PRST-PER) journal is committed to providing high quality research on the teaching and learning of physics. Visitors can scan through the journal's newer articles via Recent Papers, where they will find works like "Development and implications of technology in reform-based physics laboratories" and "What do students do when asked to diagnose their mistakes? Does it help them?" There are several hundred articles which visitors can scan through at their leisure or search by keyword. Finally, users can take a tour through the News, Announcements, and Editorials section of the site to learn about new site features and updates from the American Physics Society.

2012-10-16

390

The Effects of Physical Attractiveness and Ethnicity on Children's Behavioral Attributions and Peer Preferences  

ERIC Educational Resources Information Center

Investigates the generality of stereotypes associated with physical attractiveness and assesses the relative contributions of attractiveness and ethnicity in determining children's behavioral attributions and peer preferences. (JMB)

Langlois, Judith H.; Stephan, Cookie

1977-01-01

391

Stereotype Threat and Women's Performance in Physics  

Microsoft Academic Search

Stereotype threat (ST), which involves confirming a negative stereotype about one's group, is a factor thought to contribute to the gender gap in science achievement and participation. This study involved a quasi-experiment in which 312 US high school physics students were randomly assigned, via their classroom cluster, to one of three ST conditions. The conditions included an explicit ST condition,

Gwen C. Marchand; Gita Taasoobshirazi

2012-01-01

392

DIABETES CONTROL WITH PHYSICAL ACTIVITY AND EXERCISE  

Technology Transfer Automated Retrieval System (TEKTRAN)

Regular physical activity and exercise are important components in the prevention of diabetes. In addition to lowering blood glucose, exercise improves insulin action, contributes to weight loss, and reduces several risk factors for cardiovascular disease. The association between increased levels of...

393

Physically Based Deformable Models in Computer Graphics  

Microsoft Academic Search

Physically based deformable models have been widely embraced by the Computer Graphics community. Many problems outlined in a previous survey by Gibson and Mirtich (GM97) have been addressed, thereby making these models interesting and useful for both offline and real-time applications, such as motion pictures and video games. In this paper, we present the most significant contributions of the past

Andrew Nealen; Matthias Müller; Richard Keiser; Eddy Boxerman; Mark Carlson

2006-01-01

394

Annual Solid State Physics Conference (12th)  

Microsoft Academic Search

The Twelfth Annual Solid State Physics Conference, held 6-8 January 1975 at the University of Manchester. This report outlines the talks of the twelve invited speakers. In addition, several of the invited talks for a special symposium on liquid crystals and contributed papers on semiconductors are briefly sketched. The program included topics on phase transitions superconductivity, a pendulum analog for

R. F. Potter

1975-01-01

395

Aspects of the Physical Chemistry of Starch  

Microsoft Academic Search

Starch makes an important contribution to food structure and hence quality. Often there is a need to modify the behaviour of starch in food materials. One approach is to use knowledge of the physical chemistry of starch to modify component interactions and hence change behaviour. In this review we examine recent research on the phase behaviour and dynamics of starch

R. Parker; S. G. Ring

2001-01-01

396

REVIEW: Review of electron beam therapy physics  

Microsoft Academic Search

For over 50 years, electron beams have been an important modality for providing an accurate dose of radiation to superficial cancers and disease and for limiting the dose to underlying normal tissues and structures. This review looks at many of the important contributions of physics and dosimetry to the development and utilization of electron beam therapy, including electron treatment machines,

Kenneth R. Hogstrom; Peter R. Almond

2006-01-01

397

Review of electron beam therapy physics  

Microsoft Academic Search

For over 50 years, electron beams have been an important modality for providing an accurate dose of radiation to superficial cancers and disease and for limiting the dose to underlying normal tissues and structures. This review looks at many of the important contributions of physics and dosimetry to the development and utilization of electron beam therapy, including electron treatment machines,

Kenneth R Hogstrom; Peter R Almond

2006-01-01

398

Stellar physics with the ALHAMBRA photometric system  

Microsoft Academic Search

The ALHAMBRA photometric system was specifically designed to perform a tomography of the Universe in some selected areas. Although mainly designed for extragalactic purposes, its 20 contiguous, equal-width, medium-band photometric system in the optical wavelength range, shows a great capacity for stellar classification. In this contribution we propose a methodology for stellar classification and physical parameter estimation (Teff, log g,

T Aparicio Villegas; E J Alfaro; J Cabrera-Caño; M Moles; N Benítez; J Perea; A del Olmo; A Fernández-Soto; D Cristóbal-Hornillos; J A L Aguerri; T Broadhurst; F J Castander; J Cepa; M Cervio; R M González Delgado; L Infante; I Márquez; J Masegosa; V J Martínez; F Prada; J M Quintana; S F Sánchez

2011-01-01

399

Particle physics---Experimental  

SciTech Connect

We are continuing a research program in particle astrophysics and high energy experimental particle physics. We have joined the DUMAND Collaboration, which is constructing a deep undersea astrophysical neutrino detector near Hawaii. Studies of high energy hadronic interactions using emulsion chamber techniques were also continued, using balloon flight exposures to ultra-high cosmic ray nuclei (JACEE) and accelerator beams. As members of the DUMAND Collaboration, we have responsibility for development a construction of critical components for the deep undersea neutrino detector facility. We have designed and developed the acoustical positioning system required to permit reconstruction of muon tracks with sufficient precision to meet the astrophysical goals of the experiment. In addition, we are making significant contributions to the design of the database and triggering system to be used. Work has been continuing in other aspects of the study of multiparticle production processes in nuclei. We are participants in a joint US/Japan program to study nuclear interactions at energies two orders of magnitude greater than those of existing accelerators, using balloon-borne emulsion chambers. On one of the flights we found two nuclear interactions of multiplicity over 1000 -- one with a multiplicity of over 2000 and pseudorapidity density {approximately} 800 in the central region. At the statistical level of the JACEE experiment, the frequency of occurrence of such events is orders of magnitude too large. We have continued our ongoing program to study hadronic interactions in emulsions exposed to high energy accelerator beams.

Lord, J.J.; Boynton, P.E.; Burnett, T.H.; Wilkes, R.J.

1991-08-21

400

Physics beyond life  

NASA Astrophysics Data System (ADS)

Mystery the word in English dominates all science, facts, intelligence.since time people are trying to reveal the hidden facts of nature but always nature stands millions of step far from their reach. But this nature and its behavior are all science and it acts according to certain relationship between each other. In this paper I would like put forth my own hypothesis about what is life, what happens after death and how the earth would have originated. Introduction The existence of life before birth and after death of a human is still not explained. Several philosophers, physicists and scientists have put forth their own hypothesis to explain what happens after death. Being an Indian my culture is embedded with full of philosophies with hidden facts behind it. But there was no proof to explain the concept behind those philosophies. People and saints still believe in existence of life after death. As a contribution to this ocean of science I would like to correlate life after death with concepts of physics. address s.prabhu b.e civil engg block 7 room 47 ceg hostels anna university chennai tamil nadu india

Prabhu, S.

2002-03-01

401

Stellar physics with Gaia  

NASA Astrophysics Data System (ADS)

Gaia will provide a three-dimensional map of our Galaxy, with unprecedented positional and radial velocity measurements for about one per cent of the Galactic stellar population. Combined with astrophysical information derived from spectroscopy and photometry for each star, this will lead to a detailed understanding of Êthe formation, and dynamical and chemical evolution of our Galaxy. Other scientific products include extra-solar planets, minor bodies in the solar system, or distant quasars. The contribution of Gaia to stellar physics is less publicized, although very significant.Ê I show here a number of illustrative examples. For example, we will have access to very precise HR diagrams with very large sample of stars allowing extensive tests of fine effects in stellar evolution. Accurate parameters (esp. luminosities, and masses) will allow the independent determination of surface gravities, the characterization of non-LTE effects, and the derivation of more accurate chemical abundances. We will be able to quantify transport processes in various populations of stars, and shed new light on abundance anomalies. In addition, the preparation of Gaia induces a very large effort devoted to homogenize the stellar parameters of a great number of reference stars, and the development of performant tools designed to automatically extract parameters from tremendous amounts of spectra.

Plez, B.

2011-12-01

402

Rossi and Space Physics  

NASA Astrophysics Data System (ADS)

The beginning of the Space Age opened a new realm of exploration and Bruno Rossi immediately focused on devising an instrument for studying the interplanetary environment. The modulated Faraday cup that he and his colleagues developed was launched on Explorer X on March 21, 1961. Although the lifetime of the battery-powered spacecraft was only 60 hours, that was long enough for the MIT plasma probe to reveal a hot, supersonic solar wind flowing along the flank of the Earth's magnetosphere. The legacy of that first short flight now extends outward on a 34-year journey to 98 AU where the plasma probe on Voyager 2 measures the deflection of the subsonic wind as it approaches the outer frontier of the heliosphere and contact with the interstellar plasma outside. Over the coming decade that legacy will extend inward to within 0.05 AU of the Sun as the plasma probe on Solar Probe Plus explores the region near the inner frontier and the source of the supersonic solar wind. The exploration of the solar wind from near its beginning outward to its end will be a lasting tribute to Bruno Rossi's contributions to Space Physics.

Stone, Edward

2012-03-01

403

Particle physics: Experimental  

NASA Astrophysics Data System (ADS)

We are continuing a research program in particle astrophysics and high energy experimental particle physics. We have joined the DUMAND Collaboration, which is constructing a deep undersea astrophysical neutrino detector near Hawaii. Studies of high energy hadronic interactions using emulsion chamber techniques were also continued, using balloon flight exposures to ultra-high cosmic ray nuclei (JACEE) and accelerator beams. As members of the DUMAND Collaboration, we are responsible for the development and construction of critical components for the deep undersea neutrino detector facility. We have designed and developed the acoustic positioning system required to permit reconstruction of muon tracks with sufficient precision to meet the astrophysical goals of the experiment. In addition, we are making significant contributions to the design of the database and triggering system to be used. Work has been continuing in other aspects of the study of multiparticle production processes in nuclei. We are participants in a joint US/Japan program to study nuclear interactions at energies two orders of magnitude greater than those of existing accelerators. The program uses balloon-borne emulsion chambers. On one of the flights we found two nuclear interactions of multiplicity over 1000 - one with a multiplicity of over 2000 and pseudorapidity density (approximately) 800 in the central region. At the statistical level of the JACEE experiment, the frequency of occurrence of such events is orders of magnitude too large. We have continued our ongoing program to study hadronic interactions in emulsions exposed to high energy accelerator beams.

Lord, Jere J.; Boynton, P. E.; Burnett, T. H.; Wilkes, R. J.

1991-08-01

404

Introduction to particle physics at High School with a remote experiment  

Microsoft Academic Search

In this paper we present the advantages of the connection between the ICTs and the learning of physics in high schools. The aprendizage of physics will be improved with ICTs tools, namely in the areas of modern physics where the concepts are difficult to understand. A new and appealing way of teaching physics using ICTs can contribute to atract more

B. Dias; N. Lourenço; A. Maio; C. Marques; L. Peralta; G. Popovici; N. Popovici

405

Measurement and correlates of physical activity behavior among older minority women  

Microsoft Academic Search

Research has shown that physical activity serves a preventive function against the development of several major chronic diseases. However, studying physical activity and its health benefits is difficult due to the complexity of measuring physical activity. The overall aim of this research is to contribute to the knowledge of both correlates and measurement of physical activity. Data from the Women

Karen E Eason

2000-01-01

406

A Future for Undergraduate Physics Education?  

NASA Astrophysics Data System (ADS)

About two years ago, the Board on Physics and Astronomy of the National Research Council created a Committee on Undergraduate Physics Education (UPE), with support from the National Science Foundation. The Committee was given the task to identify ``the goals and challenges facing undergraduate physics education,'' and ``how best practices for undergraduate physics education can be implemented on a widespread and sustained basis.'' The Committee was also asked to ``assess the status of physics education research (PER)'' and to ``discuss how PER can assist in accomplishing the goal of improving undergraduate physics education best practices and education policy.'' This presentation will report the Committee's findings and recommendations, the latter aimed at audiences ranging from individual physics faculty to departmental and university-wide leadership, and professional societies and funding agencies. The Committee's challenge was daunting. We are experiencing revolutionary changes in higher education, driven by new education technologies and demands for broader and deeper STEM education for more students in more fields. Only a relatively small fraction of undergraduates take physics courses. Nevertheless, half a million undergraduates enroll in at least one physics course in every academic year. PER has become a productive research field with the potential for major contributions to the improvement of undergraduate STEM education generally. Yet, in many---probably most--institutions UPE remains persistently traditional. We all have much to do!

Langenberg, Donald

2013-03-01

407

History of Physics.  

ERIC Educational Resources Information Center

|Discusses the history of American physics, indicating that much effort has been on the atomic bond and high-energy physics, to the detriment of other topics and areas. To offset this tendency, significant research is going on in the history of solid-state physics, with glimmerings in the history of physics education. (JN)|

Moyer, Albert E.

1985-01-01

408

Tod-Down Physics  

Microsoft Academic Search

Over the past 7 years I have worked to develop two, two-semester course sequences in Theoretical and Computational Physics appropriate for undergraduate education in Physics. Covering material traditionally handled in Classical Mechanics and Electricity and Magnetism, the Theoretical Physics sequence stresses mathematical rigor, physical insight and a project- based paradigm, covering topics such as ``Landing on the Moon,'' ``Realistic Tidal

Michael Schillaci

2006-01-01

409

Ukrainian Physics Journal.  

National Technical Information Service (NTIS)

A cover-to-cover translation into English of the Russian-language edition of Ukrainskii Fizicheskii Zhurnal, Vol. 17, No. 2, February 1972, is presented. Papers on solid-state physics, nuclear physics, plasma physics, and particle physics are included.

V. E. Lashkarev

1979-01-01

410

Illinois Physics Van  

NSDL National Science Digital Library

The Physics Van is part of the outreach program at the University of Illinois Physics Department. It travels to elementary and middle schools in Champaign-Urbana and towns in the surrounding area. This site describe activities conducted by the outreach team, other physics road shows, and physics resources on the web.

Mcardle, Tim; Pogatshnik, Sara

2003-10-10

411

The Physics Plus Project.  

ERIC Educational Resources Information Center

The Physics Plus Project is producing a series of pamphlets designed to supplement existing curricula with physics application topics (such as physics of sports, motor cars, weather, medical physics, energy). Discusses rationale for the projects, pamphlet production, distribution to schools, and use of pamphlet material on examinations. (JM)

McKim, F. R.

1983-01-01

412

Physics Academic Software  

NSDL National Science Digital Library

Physics Academic Software (PAS) is a software publishing project of the American Institute of Physics in cooperation with the American Physical Society and the American Association of Physics Teachers. PAS programs are designed and targeted for professionals, teachers, and students from high school to graduate school. All software is peer reviewed for excellence and tested for accuracy, compatibility, and ease of use.

Software, Physics A.

2003-10-10

413

Doll's House Physics  

ERIC Educational Resources Information Center

|School physics rarely stands still for long. Environmental physics is now an option in some post-16 courses in England. The physics of environments, and in particular the built environment, offers a recognizable context in which to see the applications of physics at work. This article considers how a model doll's house might be used to help…

Kibble, Bob

2009-01-01

414

Evaluating the contributions of material control to insider protection  

SciTech Connect

Facilities handling nuclear material must be adequately protected against a spectrum of threats including insiders, outsiders, and collusion among insider and outsider adversaries. To counter these threats, facilities implement an integrated system of physical protection (PP), material control (MC), and material accountability (MA). (Personnel Security Assurance Programs are also used to help deter and detect potential insider adversaries.) Naturally, the contribution of each of these systems to protection against the different threats varies. Material control plays an important role in protecting against the insider threat and in assuring that material is where it should be. Evaluating its contributions, however, to the overall protection is challenging. This paper focuses on one of the modules of the ASSESS code --- a state-of-the-art safeguards evaluation tool developed jointly with Sandia National Laboratories --- and discusses its use for assessing the contributions of MC to an overall insider protection program and for evaluating the safeguards benefits of new MC technologies. 2 refs.

Al-Ayat, R.A. (Lawrence Livermore National Lab., CA (USA))

1989-06-29

415

Johannes Kepler and his contribution to Applied Mathematics  

NASA Astrophysics Data System (ADS)

The worldwide renown of Johannes Kepler is based above all on his contribution to astronomy. The 3 Kepler's Laws relating to the planets are well known and will ensure that his name is remembered by future generations. Besides his astronomical work, Kepler also made important contributions in the fields of theology, physics, phylosophy and mathematics. The actual paper discusses the advances by Kepler in the application of mathematics to the solution of "real life problems". The author made a concise account of some of the disciples by Kepler: Klug, Wieleitner, Caspar, Hammer, paying particular attention to works published by Kepler while he was living in Linz (1612-1628). The Kepler's contribution to applied mathematics is an example supremely worthy of emulation, the author concludes.

Pichler, Franz

416

Pulsars and physics.  

NASA Astrophysics Data System (ADS)

Twenty-five years of active pulsar research have yielded a quite unexpected harvest of physical effects. These range from pleasing corroborations of well-established physical principles in unfamiliar environments to direct verification of the general theory of relativity. Pulsars have the potential for advancing our understanding of high energy nuclear physics and relativistic plasma physics. They have also enlarged our horizons in atomic physics, quantum electrodynamics and solid state physics. As extremely compact sources of regularly pulsed, high brightness radio waves, they provide excellent probes of the interstellar medium and globular clusters. The large variety of connections between pulsars and physics is illustrated with examples taken from each of these areas.

Blandford, R. D.

417

Pulsars and Physics  

NASA Astrophysics Data System (ADS)

Twenty-five years of active pulsar research have yielded a quite unexpected harvest of physical effects. These range from pleasing corroborations of well-established physical principles in unfamiliar environments to direct verification of the general theory of relativity. Pulsars have the potential for advancing our understanding of high energy nuclear physics and relativistic plasma physics. They have also enlarged our horizons in atomic physics, quantum electrodynamics and solid state physics. As extremely compact sources of regularly pulsed, high brightness radio waves, they provide excellent probes of the interstellar medium and globular clusters. The large variety of connections between pulsars and physics is illustrated with examples taken from each of these areas.

Blandford, R. D.

1992-10-01

418

Physical Education 2  

NSDL National Science Digital Library

Physical education is important to children and their developing bodies, both physical and mental. All children should get up off the couch and do some type of physical activity. Students will understand and apply the health-enhancing benefits of physical activity and proper nutrition. Being healthy in physical activity and eating the right foods boost your ability to have fun and feel good about yourself. The President\\'s Council on Physical Fitness and Sports program is a great way for kids to get started at getting physically fit. They have listed their top 10 tips ...

Cherry, Mr.

2008-10-15

419

AIP Weekly Physics News  

NSDL National Science Digital Library

The University of Exeter (UK) Physics Department has given new meaning to the term "value added" in its mirroring of the American Institute of Physics' weekly publication, Physics News Update. The AIP Public Information Division makes available Physics News, which provides concise coverage of new developments in physics, graphics "depicting important physics research topics and concepts," and a subset of more in-depth stories about breaking news in physics. This Exeter site provides all of the content of the AIP's Physics News Update, and enhances it by: 1) providing an archive back to September of 1990; 2) making this archive searchable; and 3) providing the reports in HTML format, with each article subject cross-referenced to any of over 25 topics from atomic physics to superconductors, allowing the user easy access to other Physics News articles on the same topics.

1969-12-31

420

Physicalism Versus Quantum Mechanics  

Microsoft Academic Search

The widely held philosophical position called “physicalism” has been described and defended in a recent book by Jaegwon Kim.\\u000a The physicalist position claims that the world is basically purely physical. However, “physical” is interpreted in a way predicated,\\u000a in effect, upon certain properties of classical physics that are contradicted by the precepts of orthodox quantum physics.\\u000a Kim’s arguments reveal two

Henry P. Stapp

421

Contribution from pressure-sensitive adhesives  

NASA Astrophysics Data System (ADS)

The successful use of many security papers, foils and films depends on the technology of chemical fastening systems -- especially pressure sensitive adhesives. These are adhesives activated not by heat or by the evaporation of water or some other solvent, but simply by the act of application -- by pressure. These adhesives provide the means whereby laminations, substrates and seals are made effective. In addition to their physical properties these adhesives are often required to possess optical properties to allow the security materials to be visibly active and indeed the adhesive system may itself contribute as a carrier for a variety of security materials. Recent advances in adhesives chemistry have made it possible to achieve virtually all the required physical performance characteristics combined with a choice of optical properties ranging from total opacity to invisibility and including controlled translucency and tinting. The implications for security printing and packaging are important. Opacity is easy to achieve, for example by loading the adhesive with aluminum powder, by the selection of totally opaque materials like metallized film or by various printing processes. But achieving transparency is a different matter, and transparency is mandatory for applications involving the protection of documents, photographs, etc. with a clear film over-laminate. Obvious examples would be for passports, visas and other personal identification. But some security devices may themselves require protection; for example holograms or embossings. And transparency in the test laboratory is not enough. The Australian driving licence is stuck to the windshield, so the transparency of the adhesive must be sustained over long periods without deterioration due to prolonged u/v exposure, climatic conditions or aging. The commercial label market has helped to push the technology forward. There is a strong demand for the 'no-label look' for packaging of clear plastic and glass containers where the content can be easily seen without interference and where wording or symbols can be read through the container. You see this increasingly with pharmaceuticals, cosmetics and toiletries, even bottled beer. Achieving transparency is one thing but this property must be combined with all the physical properties required of the pressure sensitive adhesive. First there is the question of permanence, re-positionability and removability and the degree to which these features are required. Secondly many complications arise from the range of materials to which the adhesive must be anchored and the range to which it will be applied and must bond. Obviously these surfaces vary from those with the highest surface energy (polycarbonate for example) to those apolar surfaces engineered for minimum attraction (PTFE -- 'Teflon' for example).

Cunningham, Gilbert

1996-03-01

422

Contribution of rock fragments to soil fertility  

NASA Astrophysics Data System (ADS)

Research in plant-soil interactions has focused on the role played by the finest particles, but much less attention has been devoted to quantify the contribution of rock fragments. While the coarse soil fraction is known to affect soil physical properties, such as bulk density, porosity, water infiltration and storage, its contribution to the biogeochemical cycle is neglected. In particular in plant nutrition studies, only the fine fraction (< 2 mm) of soils is sampled and analysed while the coarse fraction (> 2 mm) is considered chemically inert. However, several recent studies have showed that rock fragments contribute significantly to nutrient content and the cation exchange capacity of soils. Considering that stony soils cover about 30% of the surface soils of Western Europe, and 60% in the Mediterranean area, new data on the potential contribution of rock fragments to soil fertility may give new insights that will re-evaluate their role in models on biogeochemical cycling. We attempt to study nutrient availability differents types of rock fragments, and started with five types of pebbles: oolitic limestone, marly limestone, lithographic limestone, chert, and flint. Pebbles were collected in topsoils, brushed thoroughly, and dried before chemical analyses. Exchangeable cations (Ca, Mg, and K) were extracted after immersion of whole pebbles in an ammonium acetate solution (1M) under agitation for 48h. We had previously established the kinetic of extraction over 6 days (after 1, 3.5, 7, 24, 48, 72 and 144 h) and showed that a plateau was reached at 48h, and with a good repeatability. The pattern of release differed among the three studied exchangeable cations, and among pebbles of different origin. The capacity of pebbles to release exchangeable calcium and magnesium was in the following decreasing order: lithographic limestone = marly limestone > oolitic limestone >> chert > flint. As expected, the greatest difference was found between limestones and the two other types. Indeed limestones, compared to chert and flint, contained 20 times higher exchangeable Ca (2.3 g Ca/kg for limestones compared to 0.08 and 0.03 g Ca/kg for chert and flint) and 7 to 10 times higher Mg (19.3g Mg/kg for limestones compared to 2.7 and 1.7 g Mg/kg for chert and flint). Potassium showed a completely different trend with the highest exchangeable K found for chert and marly limestone, intermediate levels for lithographic limestone and flint, and lowest levels for oolitic limestone. In addition, whatever the pebble origin, calcium was the element the most released. Limestones released more Mg than K, and chert and flint more K than Mg. Further, released exchangeable Ca and Mg were closely related to the dry mass of pebbles, but exchangeable K was not. As mentioned above, much more cations were extracted from limestones compared to chert and flint. Besides, chert released twice as much as flint for the three cations. Finally, the fertilisation potential of these pebbles and especially limestones is far to be negligible. For instance, the exchangeable Ca, Mg and K released from lithographic pebbles represent respectively about 50%, 20% and 10% of those released from the surrounding fine earth. These results confirm the potential contribution of rock fragments to soil fertility. Furthermore, important differences in exchangeable cations in relation to their origin were measured. Further analyses are being carried out on pebbles from other origins and on available phosphorus. We believe that this work is a first step towards a better understanding of the role of rock fragments in plant-soil relationships.

Korboulewsky, Nathalie; Besnault, Adeline; Tétégan, Marion; Cousin, Isabelle

2010-05-01

423

Physics Lab: Amusing Problems in Physics  

NSDL National Science Digital Library

This collection of problems covers a wide range of topics common to introductory physics classes. Each problem provides a context and uses humor to help students understand and use a particular physics concept. All of these problems come with a solution key and there is suggestions to help teachers use the problems in class.

Jenkins, Douglas

2011-06-17

424

Physical Culture, Physical Education and Relational Analysis  

Microsoft Academic Search

This paper argues for the recovery of a notion of physical culture that can serve the purposes of relational analysis in social research. The recovery of the notion is undertaken through a brief etymology of the term, and through an historical overview of shifts in physical culture during the twentieth century. The recovered notion is described as one dimension of

David Kirk

1999-01-01

425

Dynamical contribution into enzyme catalytic efficiency  

NASA Astrophysics Data System (ADS)

A realistic physical model for the so-called rate-promoting vibration (RPV) at enzyme action is constructed. The origin of the RPV is assumed to be an oscillating electric field produced by long-lived localized vibrational modes in protein dynamics, namely, by the so-called discrete breather (DB) in secondary structure. The strength of interaction of the RPV with the reaction coordinate is evaluated and its effect on the reaction acceleration is assessed within the framework of modern theory for thermally activated escape rate at periodic driving. We reveal the phenomenon of resonant activation in our model elucidating why the frequency of the RPV in the range 100÷200cm was chosen by the evolution of enzymes as an optimal one. The effect of the RPV on the reaction acceleration is shown to vary from moderate one (up to 10÷10) in the case of three-site DB to enormous (up to 10÷10) in the case of five-site DB and thus can significantly contribute into enzyme catalytic efficiency. Also the model is shown to be compatible with the known functional dependence of enzymatic reaction rates on solvent viscosity.

Sitnitsky, A. E.

2006-11-01

426

Physical Activity and Alzheimer's Disease: From Prevention to Therapeutic Perspectives  

Microsoft Academic Search

A number of factors, including physical activity, may contribute to prevention of cognitive decline and de- lay the onset of dementia. In addition to its convincing multiple benefits, an increasing body of evidence sug- gests that an active life has a protective effect on brain functioning in elders. Physical activity may also slow down the course of Alzheimer's disease. These

Yves Rolland; Gabor Abellan van Kan; Bruno Vellas

2008-01-01

427

Virtual Pedagogical Agents as Aids for High School Physics Teachers  

Microsoft Academic Search

The Pathway project is improving the quality of physics teaching and the number of available physics teachers by providing virtual expert help on issues of pedagogy and content. The project combines Carnegie Mellon's Synthetic Interviews and state-of- the-art digital video library technology with pedagogical advances developed at Kansas State University, and materials contributed by master teachers. The Synthetic Interview is

Scott Stevens; Dean Zollman; Michael Christel; Brian Adrain

2007-01-01

428

Student Perceptions of a Conceptual Physical Education Activity Course  

ERIC Educational Resources Information Center

|Conceptual physical education (CPE) courses are typically included in university course work to provide students knowledge and skills to engage in physical activity for life. The purpose of this study was to identify CPE course characteristics that contributed to positive and negative student perceptions. Participants included 157 undergraduates…

Jenkins, Jayne M.; Jenkins, Patience; Collums, Ashley; Werhonig, Gary

2006-01-01

429

Student Perceptions of a Conceptual Physical Education Activity Course  

ERIC Educational Resources Information Center

Conceptual physical education (CPE) courses are typically included in university course work to provide students knowledge and skills to engage in physical activity for life. The purpose of this study was to identify CPE course characteristics that contributed to positive and negative student perceptions. Participants included 157 undergraduates…

Jenkins, Jayne M.; Jenkins, Patience; Collums, Ashley; Werhonig, Gary

2006-01-01

430

Publications in the History of Physics During 1973  

ERIC Educational Resources Information Center

Analyzes more than 50 books and 14 periodicals for contributions to the history of physics. Recurring most frequently are topics in optics, ether, relativity, mechanics and atomic or nuclear physics although, historically, the works range from the 5th century B.C. to present times. (Author/CP)

Brush, Stephen G.

1975-01-01

431

Research on Effective Teaching in Elementary School Physical Education  

ERIC Educational Resources Information Center

|The perspective of this article is that the purpose of the elementary physical education program is the development of a physically active lifestyle. We discuss the relative contribution of the development of motor skills, fitness, content related to encouraging participation, and the affective goals of the program to the development of a…

Rink, Judith E.; Hall, Tina J.

2008-01-01

432

A Research Program on Solid Propellant Physical Behavior.  

National Technical Information Service (NTIS)

This report presents the results obtained during the past year in a research program on Solid Propellant Physical Behavior. The object of the research program is to contribute to our understanding of the Physical behavior of solid propellants through a co...

N. W. Tschoegl W. G. Knauss R. F. Landel

1969-01-01

433

Career Fitness Training for High School Physical Education  

ERIC Educational Resources Information Center

|Physical education can contribute to the career readiness and development needs of students by providing them with training to meet the physical fitness standards required for many occupations. A course for career fitness training could prepare students for the fitness requirements of careers in law enforcement, firefighting, and the military.…

Reilly, Erin; Karlstad, Julia A.

2004-01-01

434

Postdoctoral Opportunities in Medical Physics  

NASA Astrophysics Data System (ADS)

The medical physicist is a professional who specializes in the application of the concepts and methods of physics to the diagnosis and treatment of human disease. Medical physicists identify their primary discipline to be radiation therapy (78%), medical imaging (16%), nuclear medicine (3%), or radiation safety (2%). They state their primary responsibility to be clinical (78%), academic (9%), research (4%), etc. Correspondingly, medical physicists reveal their primarily employment to be a private hospital (42%), university hospital (32%), physicist's service group (9%), physician's service group (9%), industry (5%), and government (3%). The most frequent job of medical physicists is clinical radiation therapy physicist, whose clinical duties include: equipment acquisition, facility design, commissioning, machine maintenance, calibration and quality assurance, patient treatment planning, patient dose calculation, management of patient procedures, development of new technology, radiation safety, and regulatory compliance. The number of medical physicists in the United States can be estimated by the number of members of the American Association of Physicists in Medicine (AAPM), which has increased 5.5% annually since 1969, currently being 5,000. New positions plus retirements create a current need >300 new medical physicists per year, which exceeds supply. This is supported by the steady growth in average salaries, being 100,000 for PhDs entering the field and reaching 180,000. Graduate programs alone cannot meet demand, and physicists entering the field through postdoctoral training in medical physics remain important. Details of postdoctoral research programs and medical physics residency programs will provide direction to physics PhD graduates interested in medical physics. [The AAPM, its annual Professional Information Report, and its Public Education Committee are acknowledged for information contributing to this presentation.

Hogstrom, Kenneth

2006-04-01

435

Tetraspanin protein contributions to cancer.  

PubMed

Among the 33 human tetraspanin proteins, CD151, CD9 and Tspan12 play particularly important roles in cancer. Tetraspanin CD151, in partnership with integrins ?6?1 and ?6?4, modulates tumour cell growth, invasion, migration, metastasis, signalling and drug sensitivity. Tetraspanin CD9 has suppressor functions in multiple tumour cell types. Major CD9 partner proteins, such as EWI-2 and EWI-F, may modulate these tumour-suppressor functions. Tetraspanin Tspan12 mutations are linked to a human disease called familial exudative vitreoretinopathy. In addition, as a regulator of the metalloprotease ADAM10 (a disintegrin and metalloprotease 10) maturation and function, Tspan12 probably contributes to the pro-tumorigenic functions of ADAM10. PMID:21428937

Wang, Hong-Xing; Li, Qinglin; Sharma, Chandan; Knoblich, Konstantin; Hemler, Martin E

2011-04-01

436

Yale contributions to meteoric astronomy  

NASA Astrophysics Data System (ADS)

Until 1910 Yale University was more active in research on meteors than any other institution in America. A brief introduction describes the work carried out at other observatories in the United States. Then follow accounts of the Yale activities, starting with speculations on a spectacular fireball of 1742, the Weston fall of meteorites in 1802, and numerous investigations on "shooting stars," especially by D. Olmsted, E. C. Herrick, H. A. Newton, and W. L. Elkin. These astronomers contributed significantly to the evolution of understanding of meteoric phenomena, from early beliefs that meteors originated in the earth's atmosphere, to theories that fireballs were earth circling satellites, to our current conceptions of the relation between comets, asteroids, and meteors. Incidentally it may be noted that four of the investigators also became presidents of Yale College: Clap (1739-1766), Stiles (1778-1795), Day (1817-1847), and Hadley (1899-1921).

Hoffleit, Dorrit

437

Physical anthropology and somatic origins of the Hottentots  

Microsoft Academic Search

The history of studies on the physical anthropology of the Hottentots falls into three phases: (I) 1872–1923: recognition of the Hottentots as physically distinct (Fritsch to Broom); (II) 1923–37: recognition of the Boskop type as a component of the Old Yellow South Africans (Drennan, Dart, Galloway); (III) 1937–51: discovery of the Kakamas physical type and recognition of its contribution to

Phillip V. Tobias

1955-01-01

438

Modular Approach to Physics: Physical Pendulum  

NSDL National Science Digital Library

This item is an interactive Java applet that simulates the motion of a physical pendulum. By changing the size and initial position of the bob, the user can observe how the motion differs from that of a simple pendulum where all the mass is contained at a single point on the bottom of the string. Velocity, forces on the object, and acceleration can all be displayed as vectors on the diagram. This item is part of a larger collection of simulation based physics modules sponsored by the MAP project (Modular Approach to Physics).

2008-08-13

439

Relationship between Physical Attractiveness, Physical Effectiveness, and Self-Esteem: A Cross-Sectional Analysis among Adolescents.  

ERIC Educational Resources Information Center

Examined contributions of physical attractiveness and physical effectiveness to self-esteem among adolescents in grades 7, 9, and 11, and college freshmen. Both attractiveness and effectiveness were significantly related to self-esteem of males and females. Attractiveness and effectiveness did not appear to be differentially important to…

Thornton, Bill; Ryckman, Richard M.

1991-01-01

440

Physics and Skiing.  

ERIC Educational Resources Information Center

Presents examples of physics as applied to the sport of skiing. Examples examine the physics of sliding, unweighting, ski turning, wind resistance, the parabolic and circular motion of aerial skiers, and the aerial maneuvers of ski jumpers. (MDH)

Swinson, Derek B.

1992-01-01

441

MODELING PHYSICAL HABITAT PARAMETERS  

EPA Science Inventory

Salmonid populations can be affected by alterations in stream physical habitat. Fish productivity is determined by the stream's physical habitat structure ( channel form, substrate distribution, riparian vegetation), water quality, flow regime and inputs from the watershed (sedim...

442

Physics in the Ionosphere.  

ERIC Educational Resources Information Center

|Develops a simple model of radio wave propagation and illustrates how basic physical concepts such as refractive index, refraction, reflection and dispersion can be applied to a situation normally not met in introductory physics courses. (Author/GA)|

Murket, A. J.

1979-01-01

443

Philosophy of Physics Homepages  

NSDL National Science Digital Library

A list intended to be of interest to and useful for those working in the philosophy of physics. It includes physicists and philosophers who, in one way or another, work on the philosophy/foundations of physics.

Pooley, Oliver

2004-11-28

444

Condensed Matter Physics  

Microsoft Academic Search

A modern, unified treatment of condensed matter physics This new work presents for the first time in decades a sweeping review of the whole field of condensed matter physics. It consolidates new and classic topics from disparate sources, teaching \\

Michael P. Marder

2000-01-01

445

Beginning to edit physics.  

National Technical Information Service (NTIS)

A physicist-turned-editor shows you the basics required for copyediting physics papers (physical quantities, symbols, units, scientific notation, the structure of mathematical expressions, the nature of graphs), and points the way to learning enough ''edi...

P. W. Murphy

1995-01-01

446

Medical Physics Publishing  

NSDL National Science Digital Library

Medical Physics Publishing is a nonprofit, membership organization founded in 1985 to provide affordable books in medical physics and related fields. The books are written by and for technologists, physicists, residents, and radiologists

2003-10-10

447

Physical medicine and rehabilitation  

MedlinePLUS

Physical medicine and rehabilitation are services that can help people regain body functions they lost due to ... or developmental disorders Speech disorders and language problems Physical medicine and rehabilitation services also include sports medicine ...

448

Medical Physics Panel Discussion  

NASA Astrophysics Data System (ADS)

The panel discussion will explore opportunities and vistas in medical physics research and practice, medical imaging, teaching medical physics to undergraduates, and medical physics curricula as a recruiting tool for physics departments. Panel members consist of representatives from NSBP (Paul Guèye and Steven Avery), NIH/NIBIB (Richard Baird), NIST (Christopher Soares), AAPM (Howard Amols), ASTRO (Prabhakar Tripuraneni), and Jefferson Lab (Stan Majewski and Drew Weisenberger). Medical Physicists are part of Departments of Radiation Oncology at hospitals and medical centers. The field of medical physics includes radiation therapy physics, medical diagnostic and imaging physics, nuclear medicine physics, and medical radiation safety. It also ranges from basic researcher (at college institutions, industries, and laboratories) to applications in clinical environments.

Guèye, Paul; Avery, Steven; Baird, Richard; Soares, Christopher; Amols, Howard; Tripuraneni, Prabhakar; Majewski, Stan; Weisenberger, Drew

2006-03-01

449

Physical Organic Photochemistry.  

National Technical Information Service (NTIS)

Physical organic photochemistry has been concerned with the systematic investigation of structure-reactivity relationships involved in the photophysics and photochemistry of organic molecules. The field relies heavily on the use of physical and computatio...

N. J. Turro

1990-01-01

450

Diet and Physical Performance.  

National Technical Information Service (NTIS)

This paper provides a historical summary of military nutrition research into the role of diet for sustaining soldier physical performance. Studies of underfeeding document that physical performance is preserved during several days of underfeeding provided...

S. J. Montain A. J. Young

2003-01-01

451

(High energy physics)  

SciTech Connect

An intense analysis effort on the data we obtained in a seven month run on E704 last year has produced a flood of new results on polarization effects in particle production at 200 GeV/c. We are fortunate to be able to report in detail on those results. Our other Fermilab experiment, E683 (photoproduction of jets) has been delayed an unbelievable amount of time by Fermilab schedule slippages. It was scheduled and ready for beam two years ago As this report is being written, we have been running for two months and are expecting four months of production data taking. In this report we show some of our preliminary results. In addition we are near the end of a six month run on our CERN experiment, NA47 (SMC) which will measure the spin dependent structure functions for the proton and neutron. It is with a sense of relief, mixed with pride, that we report that all the equipment which we constructed for that experiment is currently working as designed. The random coincidence of accelerator schedules has left us slightly dazed, but all experiments are getting done and analyzed in a timely fashion. As members of the Solenoidal Detector Collaboration, we have been preparing for the only currently approved experiment at the SSC. Here we report on our scintillating fiber tracker design and simulation activities. In addition we report the results of our investigation of the detector response to heavy Z particles. Since our last report, we have joined the D0 collaboration with the primary aim of contributing to the D0 upgrade over the next few years. It is also important for us to gain experience in collider physics during the period leading up to the SDC turn-on.

Bonner, B.E.; Roberts, J.B. Jr.

1991-09-01

452

High energy physics  

NASA Astrophysics Data System (ADS)

An intense analysis effort on the data we obtained in a seven month run on E704 last year has produced a flood of new results on polarization effects in particle production at 200 GeV/c. We are fortunate to be able to report in detail on those results. Our other Fermilab experiment, E683 (photoproduction of jets) has been delayed an unbelievable amount of time by Fermilab schedule slippages. It was scheduled and ready for beam two years ago] As this report is being written, we have been running for two months and are expecting four months of production data taking. In this report we show some of our preliminary results. In addition we are near the end of a six month run on our CERN experiment, NA47 (SMC) which will measure the spin dependent structure functions for the proton and neutron. It is with a sense of relief, mixed with pride, that we report that all the equipment which we constructed for that experiment is currently working as designed. The random coincidence of accelerator schedules has left us slightly dazed, but all experiments are getting done and analyzed in a timely fashion. As members of the Solenoidal Detector Collaboration, we have been preparing for the only currently approved experiment at the SSC. Here we report on our scintillating fiber tracker design and simulation activities. In addition we report the results of our investigation of the detector response to heavy Z particles. Since our last report, we have joined the D0 collaboration with the primary aim of contributing to the D0 upgrade over the next few years. It is also important for us to gain experience in collider physics during the period leading up to the SDC turn-on.

Bonner, B. E.; Roberts, J. B., Jr.

1991-09-01

453

Intuitive ontologies for energy in physics  

NASA Astrophysics Data System (ADS)

The nature of energy is not typically an explicit topic of physics instruction. Nonetheless, participants in physics courses that involve energy are frequently saying what kind of thing they think energy is, both verbally and nonverbally. Physics textbooks also provide discourse suggesting the nature of energy as conceptualized by disciplinary experts. The premise of an embodied cognition theoretical perspective is that we understand the kinds of things that may exist in the world (ontology) in terms of sensorimotor experiences such as object permanence and movement. We offer examples of intuitive ontologies for energy that we have observed in classroom contexts and physics texts, including energy as a quasi-material substance; as a stimulus to action; and as a vertical location. Each of the intuitive ontologies we observe has features that contribute to a valid understanding of energy. The quasi-material substance metaphor best supports understanding energy as a conserved quantity.

Scherr, Rachel E.; Close, Hunter G.; McKagan, Sarah B.

2012-02-01

454

SSC Space Physics Tutorial  

NSDL National Science Digital Library

Provided by the Space Physics Center of the UCLA Institute of Geophysics and Planetary Physics, the Space Physics Tutorial gives advanced high school and college students an introduction to Space Physics. Topics include the magnetosphere, magnetopause, the Pioneer Venus Mission, planetary magnetospheres, and more. Two downloadable papers are also available in Adobe Acrobat (.pdf) format entitled: Solar Wind and Interplanetary Magnetic Field: A Tutorial and The Solar Wind Interaction with the Earth's Magnetosphere: A Tutorial.

2000-01-01

455

Doll's house physics  

NASA Astrophysics Data System (ADS)

School physics rarely stands still for long. Environmental physics is now an option in some post-16 courses in England. The physics of environments, and in particular the built environment, offers a recognizable context in which to see the applications of physics at work. This article considers how a model doll's house might be used to help learners understand energy transfer, thermal equilibrium, energy management, and responsible citizenship.

Kibble, Bob

2009-03-01

456

Physics Gateways and Resources  

NSDL National Science Digital Library

The Physics Gateways and Resources collection is comprised of physics-related web portals, web sites, and individual digital resources in many areas of the discipline, including electromagnetism, classical mechanics, optics, oscillations and waves, quantum mechanics, thermodynamics, and other areas. Here may be found materials for physics educators and learners (early childhood through graduate school), resources intended for the general public, and materials aimed at physics research communities.

2008-03-14

457

Teaching Medical Physics  

NASA Astrophysics Data System (ADS)

Medical Physics provides immediate and accessible examples that can assist in the teaching of a range of science subjects. To help teachers, we have produced a teaching pack that will be sent to all UK secondary schools in June 2006 and will be available from www.teachingmedicalphysics.org.uk. Here we discuss the advantages of teaching using applications drawn from Medical Physics, careers in Medical Physics, and some sources of other Medical Physics-related teaching resources.

Gibson, A. P.; Cook, E.; Newing, A.

2006-07-01

458

Hadron Physics at FAIR  

SciTech Connect

The new FAIR facility in Darmstadt has a broad program in the field of hadron and nuclear physics utilizing ion beams with unprecedented intensity and accuracy. The hadron physics program centers around the the high-energy storage ring HESR for antiprotons and the PANDA experiment that is integrated in it. The physics program includes among others topics like hadron spectroscopy in the charmonium mass region and below, hyperon physics, electromagnetic processes and charm in nuclei.

Wiedner, Ulrich [Institut f. Experimentalphysik I, Ruhr-University Bochum D-44780 Bochum (Germany)

2011-10-24

459

Allergie aux pollens de Cyprès  

Microsoft Academic Search

Cupressaceae pollen allergy has increased in the Mediterranean region in recent decades. This allergy constitutes one of the few causes of respiratory allergy of winter. With regards to its clinical manifestations, rhinitis and conjunctivitis are more frequent than asthma. There has been a progressive increase in the total and annual concentration of Cupressaceae pollen, the reasons for which are the

R. Ariano

2008-01-01

460

Perspective: Reaches of chemical physics in biology.  

PubMed

Chemical physics as a discipline contributes many experimental tools, algorithms, and fundamental theoretical models that can be applied to biological problems. This is especially true now as the molecular level and the systems level descriptions begin to connect, and multi-scale approaches are being developed to solve cutting edge problems in biology. In some cases, the concepts and tools got their start in non-biological fields, and migrated over, such as the idea of glassy landscapes, fluorescence spectroscopy, or master equation approaches. In other cases, the tools were specifically developed with biological physics applications in mind, such as modeling of single molecule trajectories or super-resolution laser techniques. In this introduction to the special topic section on chemical physics of biological systems, we consider a wide range of contributions, all the way from the molecular level, to molecular assemblies, chemical physics of the cell, and finally systems-level approaches, based on the contributions to this special issue. Chemical physicists can look forward to an exciting future where computational tools, analytical models, and new instrumentation will push the boundaries of biological inquiry. PMID:24089712

Gruebele, Martin; Thirumalai, D

2013-09-28

461

Perspective: Reaches of chemical physics in biology  

NASA Astrophysics Data System (ADS)

Chemical physics as a discipline contributes many experimental tools, algorithms, and fundamental theoretical models that can be applied to biological problems. This is especially true now as the molecular level and the systems level descriptions begin to connect, and multi-scale approaches are being developed to solve cutting edge problems in biology. In some cases, the concepts and tools got their start in non-biological fields, and migrated over, such as the idea of glassy landscapes, fluorescence spectroscopy, or master equation approaches. In other cases, the tools were specifically developed with biological physics applications in mind, such as modeling of single molecule trajectories or super-resolution laser techniques. In this introduction to the special topic section on chemical physics of biological systems, we consider a wide range of contributions, all the way from the molecular level, to molecular assemblies, chemical physics of the cell, and finally systems-level approaches, based on the contributions to this special issue. Chemical physicists can look forward to an exciting future where computational tools, analytical models, and new instrumentation will push the boundaries of biological inquiry.

Gruebele, Martin; Thirumalai, D.

2013-09-01

462

TEACHING PHYSICS: Just what is exciting physics?  

NASA Astrophysics Data System (ADS)

The physics that students find interesting and absorbing is not necessarily that which curriculum planners think it ought to be. What is crucial, however, is thorough preparation, equipment that works and the support of a skilled laboratory technician.

Anslow, John

1999-11-01

463

American Physical Society: Careers in Physics  

NSDL National Science Digital Library

This page features information for students who wish to pursue careers in physics. Topics include academic preparation for middle school, undergraduate, and graduate/postdoctoral students, biographies of physicists working in various specialties, and articles profiling physicists working in industry.

464

Physical Activity across Frailty Phenotypes in Females with Parkinson's Disease  

PubMed Central

Females with Parkinson's disease (PD) are vulnerable to frailty. PD eventually leads to decreased physical activity, an indicator of frailty. We speculate PD results in frailty through reduced physical activity. Objective. Determine the contribution of physical activity on frailty in PD (n = 15, 65 ± 9 years) and non-PD (n = 15, 73 ± 14 years) females. Methods. Frailty phenotype (nonfrail/prefrail/frail) was categorized and 8 hours of physical activity was measured using accelerometer, global positioning system, and self-report. Two-way ANCOVA (age as covariate) was used to compare physical activity between disease and frailty phenotypes. Spearman correlation assessed relationships, and linear regression determined associations with frailty. Results. Nonfrail recorded more physical activity (intensity, counts, self-report) compared with frail. Self-reported physical activity was greater in PD than non-PD. In non-PD, step counts, light physical activity time, sedentary time, and self-reported physical activity were related to frailty (R = 0.91). In PD, only carbidopa-levodopa dose was related to frailty (r = 0.61). Conclusion. Physical activity influences frailty in females without PD. In PD females, disease management may be a better indicator of frailty than physical activity. Further investigation into how PD associated factors contribute to frailty is warranted.

Roland, Kaitlyn P.; M. D. Cornett, Kayla; Theou, Olga; Jakobi, Jennifer M.; Jones, Gareth R.

2012-01-01

465

Physicalism and Ontological Holism  

Microsoft Academic Search

The claim of this paper is that we should envisage physicalism as an ontological holism. Our current basic physics, quantum theory, suggests that, ontologically speaking, we have to assume one global quantum state of the world; many of the properties that are often taken to be intrinsic properties of physical systems are in fact relations, which are determined by that

Michael Esfeld

1999-01-01

466

Cyber Physical Society  

Microsoft Academic Search

Natural physical space provides material basis for the birth and evolution of human beings and civilization. The progress of human society has created the cyber space. With the rapid development of information technology, the cyber space is connecting physical space, social space and mental space to form a new world - Cyber Physical Society. The way to explore the cyber

Hai Zhuge

2010-01-01

467

The Physics of Firefighting  

NSDL National Science Digital Library

This article, from The Physics Teacher, provides an explanation of the physics of how water puts out fires. It also contains a description of how firefighters determine the water pressure for their hoses--and this physics is taught in fire academies.

Egler, Robert

2007-10-30

468

Concepts of particle physics  

Microsoft Academic Search

This volume elucidates basic and well-established concepts of particle physics for the autodidact who is curious about recent developments in fundamental physics. Elementary quantum mechanics is a background must. Contents, abridged: The evolution of the particle concept before the advent of quantum mechanics. Nonrelativistic quantum mechanics and atomic physics. Relativistic quantum theory. Nuclear phenomena. Subnuclear phenomena. Index.

K. Gottfried; V. F. Weisskopf

1984-01-01

469

Creativity and Introductory Physics  

ERIC Educational Resources Information Center

|When I was an undergraduate physics major, I would often stay up late with my physics major roommate as we would digest the physics content we were learning in our courses and explore our respective imaginations armed with our new knowledge. Such activity during my undergraduate years was confined to informal settings, and the first formal…

Guilaran, Ildefonso J.

2012-01-01

470

Careers Using Physics  

NSDL National Science Digital Library

This section of the Society of Physics Studentsâ website provides information on physics-related careers. The page contains links to advice, physicistsâ profiles, summer research opportunities, and the Physics Today job listings. A featured profile of a physicist updates regularly.

2007-08-03

471

Lifestyle physical activity interventions  

Microsoft Academic Search

Introduction: Lifestyle physical activity interventions have resulted in response to the public health problem of promoting regular amounts of physical activity to the majority of U.S. adults who remain inadequately or completely inactive. These lifestyle interventions allow a person to individualize his\\/her physical activity programs to include a wide variety of activities that are at least of moderate intensity and

Andrea L. Dunn; Ross E. Andersen; John M. Jakicic

1998-01-01

472

The Humanized Physics Project  

NSDL National Science Digital Library

This web site contains an algebra-based introductory college physics curriculum with physics concepts motivated by human-functioning applications. It contains a large collection of modules covering a wide range of topics in physics using biological examples. The materials are based on an interactive pedagogy and include use of multimedia and mathematical modeling. These resources have been tested in classes and assessed.

Wentworth, Christopher

2009-07-26

473

Microcomputers in Physical Education.  

ERIC Educational Resources Information Center

Six articles about computers and physical education deal with the probable impact on the profession, tips on media selection, and programing for data management. Descriptions of physical education programs that use computers for cardiovascular fitness testing, physical fitness instruction, and analysis of motor learning experiments are included.…

Londeree, Ben R.; And Others

1983-01-01

474

Top-Down Physics  

Microsoft Academic Search

Over the past 7 years I have worked to develop two, two- semester course sequences in Theoretical and Computational Physics. Covering material traditionally handled in Classical Mechanics and Electricity and Magnetism, the Theoretical Physics sequence stresses mathematical rigor, physical insight and a project-based paradigm, covering topics such as ``Landing on the Moon,'' ``Realistic Tidal Models,'' and ``The Solar Sail.'' A

Michael Schillaci

2006-01-01

475

Physical Activity for Children  

ERIC Educational Resources Information Center

|This article presents an excerpt from "Physical Activity for Children: A Statement of Guidelines for Children Ages 5-12 (2nd Edition)" by the National Association for Sport and Physical Education. This excerpt outlines 4 guidelines in promoting age-appropriate physical activities for children with corresponding interpretations. Among other…

Strategies: A Journal for Physical and Sport Educators, 2004

2004-01-01

476

Teaching Physics with Basketball  

Microsoft Academic Search

Recently, technologies and computer takes important roles in learning and teaching, including physics. Advance in technologies can help us better relating physics taught in the classroom to the real world. In this study, we developed a module on teaching a projectile motion through shooting a basketball. Students learned about physics of projectile motion, and then they took videos of their

N. Chanpichai; P. Wattanakasiwich

2010-01-01

477

Implementing Online Physical Education  

ERIC Educational Resources Information Center

|Online physical education, although seemingly an oxymoron, appears to be the wave of the future at least for some students. The purpose of this article is to explore research and options for online learning in physical education and to examine a curriculum, assessment, and instructional model for online learning. The article examines how physical

Mohnsen, Bonnie

2012-01-01

478

Understanding Physical Education  

ERIC Educational Resources Information Center

|This easy-to-use introduction explores all of the contemporary issues and enduring themes in physical education, focusing on the United Kingdom but incorporating a global dimension. The wide range of topics covered include: (1) the requirements of National Curriculum Physical Education; (2) the current "state" of physical education; (3) the…

Green, Ken

2008-01-01

479

Flash Animations for Physics  

NSDL National Science Digital Library

This is a large collection of flash animations for all levels of and topics in physics. All provide an illustration of a very specific topic or physical phenomenon. They include single animations, interactive simulations, and short tutorials. Topics covered include Classical Mechanics, Electricity and Magnetism, Nuclear Physics, Optics, Quantum Mechanics, Relativity, and Waves.

Harrison, David

2005-12-10

480

EDITORIAL: Physical Biology  

Microsoft Academic Search

Physical Biology is a new peer-reviewed publication from Institute of Physics Publishing. Launched in 2004, the journal will foster the integration of biology with the traditionally more quantitative fields of physics, chemistry, computer science and other math-based disciplines. Its primary aim is to further the understanding of biological systems at all levels of complexity, ranging from the role of structure

Jane Roscoe

2004-01-01

481

Beginning to edit physics  

SciTech Connect

A physicist-turned-editor shows you the basics required for copyediting physics papers (physical quantities, symbols, units, scientific notation, the structure of mathematical expressions, the nature of graphs), and points the way to learning enough ``editorial physics`` to begin substantive editing.

Murphy, P.W.

1995-02-01

482

Beginning to edit physics  

Microsoft Academic Search

A physicist-turned-editor shows you the basics required for copyediting physics papers (physical quantities, symbols, units, scientific notation, the structure of mathematical expressions, the nature of graphs), and points the way to learning enough ``editorial physics`` to begin substantive editing.

1995-01-01

483

Fun with Physics.  

ERIC Educational Resources Information Center

|This book shows how physics relates to daily life. Chapters included are: (1) "Physics of Fun" (dealing with the concepts of friction, Bernoulli's principle, lift, buoyancy, adhesion, cohesion, surface tension, gas expansion, waves, light, mirror images, and solar cells); (2) "Physics of Nature" (illustrating the concepts of inertia, static…

McGrath, Susan

484