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1

Contribution méthodologique aux pratiques de matériovigilance en transfusion sanguine  

Microsoft Academic Search

To reduce seriousness and frequency of iatriogenic risk implies prevention policies and efficient operational systems for vigilance. This risk management implies definition of precise organizations and procedures able to locate and to notify quickly undesirable events. This is the case about single use medical devices (SUMD) used in blood transfusion. This article is a contribution to the organisation of the

P Roussel; A Pujol-Rey; C Arzur

2001-01-01

2

Hermann Weyl's Contribution to Physics  

NASA Astrophysics Data System (ADS)

In May 1954, at the age of 69, Hermann Weyl gave a lecture1 in Lausanne, as President Ursprung already mentioned. This lecture was largely autobiographical, centering upon various stages of his thinking, especially about philosophy. It touched upon Weyl's first important work in physics: The next epochal event for me was that I made an important mathematical discovery. It concerned the regularity in the distribution of the eigenfrequencies of a continuous medium, like a membrane, an elastic body, or the electromagnetic ether. The idea was one of many, as they probably come to every young person preoccupied with science but while the others soon burst like soap bubbles, this one led, as a short inspection showed, to the goal. I was myself rather taken aback by it as I had not believed myself capable of anything like it...

Yang, Chen Ning

2013-05-01

3

Contributions from the Cloud Physics Laboratory.  

National Technical Information Service (NTIS)

The report commences with a brief description of the physical characteristics of the clouds which occurred at ground level in the neighborhood of the University of Washington's research station in the Olympic Mountains during the period January 15 to Marc...

P. V. Hobbs W. D. Scott J. E. Dye D. A. Burrows

1966-01-01

4

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.

5

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

6

The Contribution of the History of Physics in Physics Education: A Review.  

ERIC Educational Resources Information Center

Focuses on the selection, classification, and comparative presentation of various proposals concerning the contribution of the history of physics in physics education that have been designed and/or carried out as part of either research or curriculum development during the last century. (Author/SAH)

Seroglou, Fanny; Koumaras, Panagiotis

2001-01-01

7

Relative contribution of physical activity to neonatal oxygen consumption.  

PubMed

To explore the relevance of distinguishing between resting and global energy expenditure in newborn infants, oxygen consumption (VO2) was measured during extremes of physical activity in 17 parenterally fed newborn infants with a large range of body weights (1.0-3.4 kg) and gestational ages (28-41 weeks). Under constant nutrient intakes, each infant served as his/her own control when comparing VO2 during resting conditions and spontaneous intense physical activity, called exercise. VO2 was significantly correlated with body weight at rest (r = 0.96). But during intense activity, the better predictor of exercise-induced VO2 was body weight in the smaller infants (< 2.0 kg) and gestational age in the larger infants (> 35 weeks). The difference in VO2 between both levels of activity represented the oxygen cost of exercise, which decreased (P < 0.01) with body weight. For clinical purposes, the physical activity of low-birth-weight infants does not contribute substantially to their energy balance. PMID:8486114

Billeaud, C; Piedboeuf, B; Jéquier, J C; Chessex, P

1993-03-01

8

The Contribution of the History of Physics in Physics Education: A Review  

NASA Astrophysics Data System (ADS)

Our research is focused on the selection, classification and comparative presentation of the various proposals concerning the contribution of the history of physics in physics education, that have been designed and/or carried out as part of either research or curriculum development during the last century. The framework of the classification is the result of the study of the aims of the teaching-learning of physics, as they have been presented since the 1960s, coupled with the current trends in science education, including discovery learning in the 1960s and constructivism nowadays. The study of the various proposals concerning the contribution of the history of physics in physics education revealed different points of view and led to the creation of new sub-categories of the initial framework. In an attempt to havea better overall view of the classification, we designed a chart so that the various proposals reported could be observed and commented on in a comparative way. The framework of the classification is presented on the vertical axis of a chart, while time from 1893, the year of the earliest reference available (Lodge 1893), till today is presented on the horizontal axis.

Seroglou, Fanny; Koumaras, Panagiotis

9

Sequence stratigraphy of the Aux Vases Sandstone: A major oil producer in the Illinois basin  

USGS Publications Warehouse

The Aux Vases Sandstone (Mississippian) has contributed between 10 and 25% of all the oil produced in Illinois. The Aux Vases is not only an important oil reservoir but is also an important source of groundwater, quarrying stone, and fluorspar. Using sequence stratigraphy, a more accurate stratigraphic interpretation of this economically important formation can be discerned and thereby enable more effective exploration for the resources contained therein. Previous studies have assumed that the underlying Spar Mountain, Karnak, and Joppa formations interfingered with the Aux Vases, as did the overlying Renault Limestone. This study demonstrates that these formations instead are separated by sequence boundaries; therefore, they are not genetically related to each other. A result of this sequence stratigraphic approach is the identification of incised valleys, paleotopography, and potential new hydrocarbon reservoirs in the Spar Mountain and Aux Vases. In eastern Illinois, the Aux Vases is bounded by sequence boundaries with 20 ft (6 m) of relief. The Aux Vases oil reservoir facies was deposited as a tidally influenced siliciclastic wedge that prograded over underlying carbonate-rich sediments. The Aux Vases sedimentary succession consists of offshore sediment overlain by intertidal and supratidal sediments. Low-permeability shales and carbonates typically surround the Aux Vases reservoir sandstone and thereby form numerous bypassed compartments from which additional oil can be recovered. The potential for new significant oil fields within the Aux Vases is great, as is the potential for undrained reservoir compartments within existing Aux Vases fields.

Leetaru, H. E.

2000-01-01

10

The contributing role of physical education in youth's daily physical activity and sedentary behavior  

PubMed Central

Background School physical education (PE) is considered as an effective channel for youth to accumulate moderate-to-vigorous physical activity (MVPA) and reduce sedentary time. The purpose of this study was to determine the contributing role of PE in daily MVPA and sedentary time among youth. Methods The study recruited 67 sixth grade children (29 boys; Mean age?=?11.75) from two suburban schools at a U.S. Midwest state, 48 of whom contributed ?10 hours of physical activity (PA) data per day were included for analysis. An objective monitoring tool (i.e., Sensewear armband monitor) was used to capture the participants’ MVPA and sedentary time for 7–14 days. Pearson product–moment correlation analysis (r), multi-level regression analyses, and analysis of variance were conducted for data analysis. Results MVPA and sedentary time in PE showed significant positive associations with daily MVPA and sedentary time, respectively (r?=?0.35, p?contribution to increasing daily MVPA and decreasing daily sedentary time among youth. Active participation in PE classes increases the chance to be more active and less sedentary beyond PE among youth.

2014-01-01

11

Physics Teacher Preparation Contributes More Than Additional Graduates  

NSDL National Science Digital Library

Physics departments across the country are facing pressure to increase the number of graduates. Some of the more successful efforts have involved curriculum and programming changes geared toward particular career paths. Students want to know what they can do with a physics degree, and "anything you want" is not a sufficient answer. In response, MTSU Physics and Astronomy recently added high school teaching to our list of concentrations. There is a shortage of high school teachers with credentials in STEM areas in this country â especially in physics â but there are very few physics teachers being produced. We have a situation where there is demand for a product that physics departments have the ability to supply, yet physics departments are not sure how to respond. The APS and AAPT have taken a leadership role by establishing the Physics Teacher Education Coalition to provide resources to universities wishing to better prepare physics teachers. At MTSU, we have found that curriculum and programming changes made to boost the number of physics teachers has resulted in a spill-over effect that benefits other areas in the department.

Henderson, Ron

2012-06-14

12

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

13

Applied Physics Lab Kennedy Space Center: Recent Contributions  

NASA Technical Reports Server (NTRS)

The mission of the Applied Physics Lab is: (1) Develop and deliver novel sensors and devices to support KSC mission operations. (2) Analyze operational issues and recommend or deliver practical solutions. (3) Apply physics to the resolution of long term space flight issues that affect space port operation on Earth or on other planets.

Starr, Stan; Youngquist, Robert

2006-01-01

14

Contributions of SCADM to solar-terrestrial physics  

NASA Technical Reports Server (NTRS)

The many different aspects of solar terrestrial physics are summarized. The possible influence of variations in the solar outputs on the terrestrial climate, and the role for SCADM in such studies is emphasized. The use of SCADM to provide detailed information on variations in the solar outputs over a sizeable fraction of the solar cycle, and on the physics of the convection layer of the Sun is discussed.

Fisk, L. A.

1980-01-01

15

Conceptual and Physical Object Qualities Contribute Differently to Motor Affordances  

ERIC Educational Resources Information Center

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…

Vingerhoets, G.; Vandamme, K.; Vercammen, A.

2009-01-01

16

Psycho-Physiological Contributions of Physical Activity and Sports for Girls.  

ERIC Educational Resources Information Center

Sport and physical activity contribute to the physical movement capabilities of girls, the health status of their bodies, the values and ethical behaviors they develop, and their personal development of a unique identity. This paper offers an overview of contributions and potential challenges related to physiological dimensions and psychosocial…

Bunker, Linda K

1998-01-01

17

NASA/Marshall Space Flight Center's Contributions to Space Plasma Physics  

NASA Technical Reports Server (NTRS)

Since the mid-l970's, the Space Plasma Physics Group at NASA's Marshall Space Flight Center has contributed critical instrumentation to numerous satellite and sounding rocket missions exploring the plasmas of near-Earth space. This talk will review major discoveries in Earth's ionosphere, plasmasphere, and magnetosphere directly attributable to the researchers of the Space Plasma Physics Group and the significance of these discoveries to the field of plasma physics.

Adrian, M. L.; Six, N. Frank (Technical Monitor)

2002-01-01

18

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

19

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

20

An efficient method to compute spurious end point contributions in PO solutions. [Physical Optics  

NASA Technical Reports Server (NTRS)

A method is given to compute the spurious endpoint contributions in the physical optics solution for electromagnetic scattering from conducting bodies. The method is applicable to general three-dimensional structures. The only information required to use the method is the radius of curvature of the body at the shadow boundary. Thus, the method is very efficient for numerical computations. As an illustration, the method is applied to several bodies of revolution to compute the endpoint contributions for backscattering in the case of axial incidence. It is shown that in high-frequency situations, the endpoint contributions obtained using the method are equal to the true endpoint contributions.

Gupta, Inder J.; Burnside, Walter D.; Pistorius, Carl W. I.

1987-01-01

21

Feminisms and Figurational Sociolo Contributions to Understandings of Sports, Physical Education and Sex\\/Gender  

Microsoft Academic Search

This paper seeks to examine the relationship between various sports feminisms and figurational sociology. A number of feminist and figurational contributions to understandings of sports, physical education and sex\\/gender are discussed, and their relative adequacy considered. The key differences between feminist and figurational approaches are highlighted, particularly in relation to the role of values in sociology. Particular attention is paid

Sharon Colwell

1999-01-01

22

Problemes aux limites en theorie des distributions  

Microsoft Academic Search

Résumé  Etude de la méthode des potentiels pour résoudre des problèmes aux limites relatifs à certains opérateurs différentiels. Résolution\\u000a et discussion des problèmes aux limites pour un système diffèrentiel elliptique lorsque les données sont des distributions\\u000a (le problème étant elliptique à droite ou à gauche).

Paul Krée

1969-01-01

23

The contribution of walking to work to adult physical activity levels: a cross sectional study  

PubMed Central

Objective To objectively examine the contribution to adult physical activity levels of walking to work. Methods Employees (n = 103; 36.3 ± 11.7 years) at 17 workplaces in south-west England, who lived within 2 miles (3.2 km) of their workplace, wore Actigraph accelerometers for seven days during waking hours and carried GPS receivers during the commute to and from work. Physical activity volume (accelerometer counts per minute (cpm)) and intensity (minutes of moderate to vigorous physical activity (MVPA)) were computed overall and during the walk to work. Results Total weekday physical activity was 45% higher in participants who walked to work compared to those travelling by car (524.6. ± 170.4 vs 364.6?±?138.4 cpm) and MVPA almost 60% higher (78.1?±?24.9 vs 49.8?±?25.2 minutes per day). No differences were seen in weekend physical activity, and sedentary time did not differ between the groups. Combined accelerometer and GPS data showed that walking to work contributed 47.3% of total weekday MVPA. Conclusions Walking to work was associated with overall higher levels of physical activity in young and middle-aged adults. These data provide preliminary evidence to underpin the need for interventions to increase active commuting, specifically walking, in adults.

2014-01-01

24

Compliance potential mapping: a tool to assess potential contributions of walking towards physical activity guidelines  

PubMed Central

Background Walking for transport is increasingly considered an important component for meeting physical activity guidelines. This is true for individuals of all ages, and particularly important for seniors, for whom other physical activities may not be recommended. In order to evaluate the potential contributions of walking to physical activity, in this paper the concept of Compliance Potential Mapping is introduced. The concept is illustrated using seniors as a case study. Methods Based on estimates of walking trip distance and frequency, estimates of expected total daily walking distance are obtained. These estimates are converted to weekly walking minutes, which are in turn compared to recommended physical activity guidelines for seniors. Once estimates of travel behavior are available, the approach is straightforward and based on relatively simple map algebra operations. Results Compliance Potential Mapping as a tool to assess the potential contributions of walking towards physical activity is demonstrated using data from Montreal’s 2008 travel survey. The results indicate that the central parts of Montreal Island display higher potential for compliance with physical activity guidelines, but with variations according to age, income, occupation, possession of driver’s license and vehicle, and neighborhood and accessibility parameters. Conclusions Compliance Potential Maps offer valuable information for public health and transportation planning and policy analysis.

2014-01-01

25

Contribution of the physical environment to socioeconomic gradients in walking in the Whitehall II study.  

PubMed

Socioeconomic gradients in walking are well documented but the underlying reasons remain unclear. We examined the contribution of objective measures of the physical environment at residence to socioeconomic gradients in walking in 3363 participants (50-74years) from the Whitehall II study (2002-2004). Individual-level socioeconomic position was measured as most recent employment grade. The contribution of multiple measures of the physical environment to socioeconomic position gradients in self-reported log transformed minutes walking/week was examined by linear regression. Objective measures of the physical environment contributed only to a small extent to socioeconomic gradients in walking in middle-aged and older adults living in Greater London, UK. Of these, only the number of killed and seriously injured road traffic casualties per km of road was predictive of walking. More walking in areas with high rates of road traffic casualties per km of road may signal an effect not of injury risk but of more central locations with multiple destinations within short distances ('compact neighbourhoods'). This has potential implications for urban planning to promote physical activity. PMID:24637091

Pliakas, Triantafyllos; Wilkinson, Paul; Tonne, Cathryn

2014-05-01

26

Spectroscopy of antiprotonic helium atoms and its contribution to the fundamental physical constants  

PubMed Central

Antiprotonic helium atom, a metastable neutral system consisting of an antiproton, an electron and a helium nucleus, was serendipitously discovered, and has been studied at CERN’s antiproton decelerator facility. Its transition frequencies have recently been measured to nine digits of precision by laser spectroscopy. By comparing these experimental results with three-body QED calculations, the antiproton-to-electron massratio was determined as 1836.152674(5). This result contributed to the CODATA recommended values of the fundamental physical constants.

Hayano, Ryugo S.

2010-01-01

27

Contribution of Hip Abductor Strength to Physical Function in Patients With Total Knee Arthroplasty  

PubMed Central

Background Investigating modifiable factors that contribute to functional limitations in patients with total knee arthroplasty (TKA) may guide changes in rehabilitation protocols and improve functional outcomes. Whereas quadriceps muscle weakness has been demonstrated to contribute to functional limitations in TKA, the role of hip abductor weakness has not received attention. Objective The purpose of this study was to determine whether hip abductor strength (force-generating capacity) contributes to physical function beyond what can be explained by quadriceps muscle strength in patients after a TKA. Design A cross-sectional design was used in the study. Setting The study was conducted in a clinical laboratory at an academic center. Patients Thirty-one people with TKA (74% female; mean age=68 years, SD=8; mean body mass index=31 kg/m2, SD=5) participated in the study. Measurements Strength of quadriceps muscles and hip abductors was measured using an isokinetic dynamometer. Performance-based physical function was assessed with 4 measures: self-selected walking speed, the Figure-of-8 Walk Test, the Stair Ascend/Descend Test, and the 5-Chair Rise Test. Self-reported physical function was assessed with the Western Ontario and McMaster Universities Osteoarthritis Index Physical Function Subscale. Results In hierarchical regression models, after accounting for demographic and anthropometric factors, quadriceps muscle strength was associated with performance on the Stair Ascend/Descend Test. After accounting for demographic, anthropometric, and quadriceps strength, hip abductor strength was associated with performance on the Stair Ascend/Descend Test, the Figure-of-8 Walk Test, and the 5-Chair Rise Test. Limitations The study design precluded ascertainment of causal relationships. Conclusions After TKA, hip abductor strength influenced physical function in participants more than did demographic or anthropometric measures or quadriceps strength. Longitudinal studies with larger samples are warranted. If findings are replicated, they will justify targeting the hip abductors during rehabilitation after TKA.

Teixeira, Paulo E.P.; Almeida, Gustavo J.M.; Gil, Alexandra B.; DiGioia, Anthony M.; Levison, Timothy J.; Fitzgerald, G. Kelley

2011-01-01

28

Physical contribution of Néel and Brown relaxation to interpreting intracellular hyperthermia characteristics using superparamagnetic nanofluids.  

PubMed

In this work, the AC magnetically-induced heating characteristics of various viscous nanofluids with either soft ferrite (Fe3O4) or hard ferrite (CoFe2O4) superparamagnetic nanoparticles (SPNPs) were investigated to empirically and physically interpret the contribution of "Néel relaxation loss power, P(Néel relaxation loss)," or "Brown relaxation loss power, P(Brown relaxation loss)," to the total AC heat generation of intracellular hyperthermia or in-vivo hyperthermia. It was found that the contribution of P(Brown relaxation loss) to the total AC heating power, P(totaI), and the specific loss power (SLP) was severely affected by the surrounding environment (or in-vivo environment) while the contribution of P(Néel relaxation loss) to the P(total) was independent of the variation of surrounding environment. Furthermore, all the theoretical and experimental results strongly suggested that highly efficacious intracellular hyperthermia (or in-vivo hyperthermia) modality can be achieved by enhancing the P(Néel relaxation loss) rather than the P(Brown relaxation loss) of SPNP agents in nanofluids. PMID:23882824

Jeun, Minhong; Kim, Yu Jeong; Park, Ki Ho; Paek, Sun Ha; Bae, Seongtae

2013-08-01

29

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

30

[Brazil-Medico and the contributions of medical-hygienist thought to the scientific bases of Brazilian physical education].  

PubMed

The end of the nineteenth century and beginning of the twentieth were emblematic in the 'scientifization' of physical education in Brazil. This examination of the journal Brazil-Medico during 1887-1923 seeks to identify views of the body and health as well as contributions to the scientific bases of physical education in Brazil. PMID:19241681

Mendes, Maria Isabel Brandão de Souza; da Nóbrega, Terezinha Petrucia

2008-01-01

31

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

32

Contribution of school programmes to physical activity levels and attitudes in children and adults.  

PubMed

Although children and youth currently form the most active segments of the population in developed societies, there is a marked trend toward an increase in sedentary lifestyle among school-age children. The purpose of this review is to analyse the effects of school physical education (PE) programmes on: (i) the physical activity (PA) levels of participants as children and adults; and (ii) attitudes toward PE and PA in the same groups. Based on the literature analysed, it can be suggested that a sufficient quantity of a quality PE programme can contribute significantly to the overall amount of moderate-to-intense PA of the school-age child. Schools also have the potential to influence the habitual PA of children by encouraging increased participation in extracurricular sports activities, by favouring active commuting to school and by providing exercise equipment and supervision for youth in their neighbourhoods. Most young children have a very positive attitude towards PE. However, as they grow older, their perception of PE as a positive experience seems to become more ambiguous. From the few studies available, it seems likely that quality PE programmes help to maintain initial positive perceptions. Future research should address factors influencing the change of perceptions as a child matures. In addition to offering a quality PE programme, schools should ensure that the total weekly amount of PE is sufficient not only to maintain but also to enhance a child's physical fitness. More research is needed to determine the ability of school PE programmes to influence PA behaviour in adult life and to evaluate strategies that will make optimal use of the curricular time allocated to PE. PMID:15707375

Trudeau, François; Shephard, Roy J

2005-01-01

33

Multiple regions of a divergent promoter control the expression of the Agrobacterium rhizogenes aux1 and aux2 plant oncogenes  

Microsoft Academic Search

The two auxin biosynthesis genes, aux1 and aux2 of Agrobacterium rhizogenes strain A4, are located on opposite DNA strands with a short integenic region (394 bp) between their coding sequences. A functional analysis of this divergent promoter is presented. The transcription initiation sites of the two aux genes were determined and regions important for promoter activity were identified by deletion

Valérie Gaudin; Christine Camilleri; Lise Jouanin

1993-01-01

34

A combinatorial TIR1/AFB-Aux/IAA co-receptor system for differential sensing of auxin  

PubMed Central

The plant hormone auxin regulates virtually every aspect of plant growth and development. Auxin acts by binding to the F-box protein TIR1 and promotes the degradation of the Aux/IAA transcriptional repressors. Here, we show that efficient auxin binding requires assembly of an auxin co-receptor complex consisting of TIR1 and an Aux/IAA protein. Heterologous experiments in yeast and quantitative IAA binding assays using purified proteins showed that different combinations of TIR1 and Aux/IAA proteins form co-receptor complexes with a wide range of auxin-binding affinities. Auxin affinity appears to be largely determined by the Aux/IAA. As there are 6 TIR1/AFBs and 29 Aux/IAA proteins in Arabidopsis thaliana, combinatorial interactions may result in many co-receptors with distinct auxin sensing properties. We also demonstrate that the AFB5-Aux/IAA co-receptor selectively binds the auxinic herbicide picloram. This co-receptor system broadens the effective concentration range of the hormone and may contribute to the complexity of auxin response.

Villalobos, Luz Irina A. Calderon; Lee, Sarah; De Oliveira, Cesar; Ivetac, Anthony; Brandt, Wolfgang; Armitage, Lynne; Sheard, Laura B.; Tan, Xu; Parry, Geraint; Mao, Haibin; Zheng, Ning; Napier, Richard; Kepinski, Stefan; Estelle, Mark

2012-01-01

35

Contributing Factors in Students' Choice of a Physical Therapist Assistant Career: A Contrast with the Physical Therapist Career Pathway  

ERIC Educational Resources Information Center

The health care professions have gained significant notoriety as one of the fastest growing career opportunities in the country. In particular, physical therapy has gained a reputation as a vital and significant member of the health care team. The physical therapy field has struggled to provide adequate services to meet patients' needs due to the…

Mele, Robert V.

2009-01-01

36

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

37

L'Anse Aux Meadows, Newfoundland  

NASA Technical Reports Server (NTRS)

L'Anse aux Meadows is a site on the northernmost tip of the island of Newfoundland, located in the Province of Newfoundland and Labrador, Canada, where the remains of a Viking village were discovered in 1960 by the Norwegians Helge and Anne Ingstad. The only authenticated Viking settlement in North America outside Greenland, it was the site of a multi-year archaeological dig that found dwellings, tools and implements that verified its time frame. The settlement, dating more than five hundred years before Christopher Columbus, contains the earliest European structures in North America. Named a World Heritage site by UNESCO, it is thought by many to be the semi-legendary 'Vinland' settlement of explorer Leif Ericson around AD 1000. The settlement at L'Anse aux Meadows consisted of at least eight buildings, including a forge and smelter, and a lumber yard that supported a shipyard. The largest house measured 28.8 by 15.6 m and consisted of several rooms. Sewing and knitting tools found at the site indicate women were present at L'Anse aux Meadows

The image was acquired on September 14, 2007, covers an area of 14.2 x 14.6 km, and is located at 51.5 degrees north latitude, 55.6 degrees west longitude.

The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

2008-01-01

38

Physical quality of pelleted animal feed 3. Contribution of feedstuff components  

Microsoft Academic Search

An overview is given of effects of the diet ingredients and their composition (e.g., starch, protein, sugar, fat and fibre content) on production characteristics of pellets and on their physical quality (pellet hardness and pellet durability) as compound animal feeds. Large differences exist in the effect on pellet physical quality within and between groups of diet ingredients when incorporated in

M. Thomas; T. van Vliet

1998-01-01

39

The Contributions of Weight Loss and Increased Physical Fitness to Improvements in Health-Related Quality of Life  

PubMed Central

The relative contribution of obesity versus poor fitness to adverse health outcomes and diminished quality of life remains an area of controversy. Indeed, some researchers contend that poor cardiorespiratory fitness represents a greater threat to health and health-related quality of life than excess body weight. We addressed this issue by providing 298 obese 50–75 year-old women with a six-month lifestyle intervention that incorporated a low-calorie eating pattern coupled with an aerobic exercise program consisting of 30 min/day of brisk walking. The results showed that weight loss exhibited a significant individual contribution to improvements in seven of the nine domains of quality of life assessed by the Medical Outcomes Study Short Form (SF-36). With the exception of physical functioning, however, physical fitness did not significantly contribute to improvements beyond the effects weight loss. Moreover, weight loss functioned as a full mediator of the association between increases in physical fitness and improvements in general health, vitality, and change in health relative to the previous year. Collectively, these findings suggest that for treatment-seeking obese individuals, weight loss rather than increased fitness contributes significantly to improvements in health-realted quality of life.

Ross, Kathryn M.; Milsom, Vanessa A.; Rickel, Katie A.; DeBraganza, Ninoska; Gibbons, Lauren M.; Murawski, Mary E.; Perri, Michael G.

2009-01-01

40

Does doing housework keep you healthy? The contribution of domestic physical activity to meeting current recommendations for health  

PubMed Central

Background Recent lifestyle approaches to physical activity have included the promotion of domestic physical activities such as do-it-yourself or home maintenance, gardening and housework. Although it is acknowledged that any activity is better than none, there is a danger that those undertaking domestic ‘chores’ may assume that this activity is moderate intensity and therefore counts towards this 150 minute per week target The purpose of this paper was to report the contribution domestic physical activity makes to total weekly physical activity and the relationship between domestic physical activity and leanness in the Northern Ireland population. Methods 4563 adults participated in this cross-sectional survey of physical activity behaviour. Data were collected through face-to-face interviews using computer assisted personal interviewing. Gender and age group differences in domestic MVPA activity and the ratio of domestic to total MVPA were explored using non-parametric Kruskal-Wallis tests. Self-reported volume and intensity of physical activity (in bouts of 10 minutes or more) in the home and self-reported height and weight were used to determine the association between domestic physical activity and leanness using an ANCOVA having controlled for age, gender, socio-economic and smoking status. Results 42.7% of the population report levels of physical activity which meet or exceed the current United Kingdom recommendations. Domestic physical activity accounts for 35.6% of the reported moderate to vigorous physical activity (MVPA). For women, if domestic physical activity was excluded from total MVPA, only 20.4% would be deemed to meet current recommendations. Time spent in domestic physical activity at moderate or vigorous intensity was found to be negatively associated with leanness (P?=?0.024), [R Squared?=?.132 (Adjusted R Squared?=?.125)]. Conclusions Domestic physical activity accounts for a significant proportion of self-reported daily MVPA particularly among females and older adults however such activity is negatively associated with leanness suggesting that this activity may not be sufficient to provide all of the benefits normally associated with meeting the physical activity guidelines.

2013-01-01

41

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).

42

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

43

X-ray cross-sections and crossroads (The International Radiation Physics Society) - Richard Pratt's contributions to both  

NASA Astrophysics Data System (ADS)

Some examples of the impact of the theoretical contributions by Richard Pratt and his collaborators on photon cross section compilations at NBS/NIST and elsewhere over the past several decades are presented. Both the theoretical and measurement works which combine to provide this data base, and the contact with the varied user groups in medical applications, nuclear engineering, crystallography and X-ray astronomy, have formed a global crossroads of researchers now embodied in the International Radiation Physics Society (IRPS). Since the founding of the IRPS at the 3rd International Symposium on Radiation Physics (ISRP-3) in Ferrara, Italy, in 1985, the Secretariat for this ``global radiation physics family'' (the IRPS) has resided at the University of Pittsburgh under the direction of Richard Pratt. A brief account of the origins and history of the IRPS, beginning with ISRP-1 in Calcutta in 1974, is presented.

Hubbell, J. H.

2000-08-01

44

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

45

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

46

Physical activity patterns in Portuguese adolescents: The contribution of extracurricular sports  

Microsoft Academic Search

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. Four EC sport categories

Pedro Silva; Michael Sousa; Luisa Aires; André Seabra; José Ribeiro; Gregory Welk; Jorge Mota

2010-01-01

47

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

48

Why Some Stay: A Study of Factors Contributing to Persistence in Undergraduate Physics.  

ERIC Educational Resources Information Center

Relates that concerns about the dropout rate among physics majors at the University of Montreal (Canada) led to a study of student persistence. Indicates that those who dropped out and those who stayed differed in their perceptions of their skills and knowledge, and their confidence in finishing the program. Presents preliminary recommendations.…

Vazquez-Abad, Jesus; Winer, Laura R.; Derome, Jean-Robert

1997-01-01

49

Why Some Stay: A Study of Factors Contributing to Persistence In Undergraduate Physics.  

ERIC Educational Resources Information Center

This paper reports on research undertaken to provide information about the factors influencing student persistence in undergraduate physics programs at the University of Montreal in Quebec, Canada. Data collection methods included student interviews, faculty and staff interviews, and two separate questionnaire administrations to students enrolled…

Vazquez-Abad, Jesus; And Others

50

Determinants of Peer Social Status: Contributions of Physical Appearance, Reputation, and Behavior.  

ERIC Educational Resources Information Center

Behavioral correlates of social status and the relative importance of physical appearance, reputation, and current behavior in the assignment of social status by peers was assessed in 2 studies of elementary school students (68 and 119 students, respectively). Videotapes and photographs were used to compare popular, rejected, and neglected…

Kennedy, Janice H.

1990-01-01

51

Difference, Adapted Physical Activity and Human Development: Potential Contribution of Capabilities Approach  

ERIC Educational Resources Information Center

This paper is a call to Adapted Physical Activity (APA) professionals to increase the reflexive nature of their practice. Drawing upon Foucault's concept of governmentality (1977) APA action may work against its own publicized goals of empowerment and self-determination. To highlight these inconsistencies, we will draw upon historical and social…

Silva, Carla Filomena; Howe, P. David

2012-01-01

52

The Contribution of Home, Neighbourhood and School Environmental Factors in Explaining Physical Activity among Adolescents  

PubMed Central

The present study aimed at investigating the influence of home, neighbourhood and school environmental factors on adolescents' engagement in self-reported extracurricular physical activity and leisure time sports and on MVPA objectively measured by accelerometers. Environmental factors were assessed using questionnaires. Gender specific hierarchical regression analyses were conducted, with demographic variables entered in the first block, and environmental, psychosocial factors and interactions terms entered in the second block. Participation in extracurricular activities at school was positively related to the number of organized activities and the provision of supervision. Perceived accessibility of neighborhood facilities was not related to engagement in leisure time sports, whereas the availability of sedentary and physical activity equipment was. Findings were generally supportive of ecological theories stating that behaviors are influenced by personal and environmental factors that are constantly interacting.

Haerens, Leen; Craeynest, Mietje; Deforche, Benedicte; Maes, Lea; Cardon, Greet; De Bourdeaudhuij, Ilse

2009-01-01

53

The contribution of the giraffe to hemodynamic knowledge: a unified physical principle for the circulation.  

PubMed

Hemodynamics stands on three main physical principles: the hydrostatic pressure, firstly described by Stevino, the viscous flow pressure, described by Poiseuille and the total hydraulic energy, or Bernoulli's equation. However, neither of these physical principles gives a comprehensive description of the single pressure measurement in the cardiovascular system. Hence, all these principles should be used together to fully describe the physical forces acting in the circulation of blood. Experiments that measured the hydrostatic pressure in the jugular vein of the giraffe have shown that a few guidelines need to be followed to measure it correctly. Following these guidelines, it can be seen that hydrostatic and viscous flow pressures are strictly related to one another, and that this relationship is described in mathematical terms. In addition, it has been shown that hydrostatic and viscous pressures should be included in Bernoulli's principle, to give the combined Bernoulli-Poiseuille equation. This unified principle is helpful not only to measure correctly the pressure with a catheter connected to a pressure transducer, but also to give to the pressure measured in a patient with the mercury manometer, a strong connection with the description of the pressure as a physical force acting inside the circulation. In addition it provides a comprehensive view of the cardiovascular system as a closed hydrodynamic system, in which the heart is a pump, that does not normally work to overcome the force of gravity. The question at this point is: are there any pathophysiological conditions in which the heart needs to be confronted with the sudden appearance of the force of gravity inside the cardiovascular system? PMID:10609386

Recordati, G

1999-09-01

54

Additional Contributions to the Development of the New Snow-Physics Scheme for SSiB  

NASA Technical Reports Server (NTRS)

The Simplified Simple Biosphere Model (SSiB) had a well-documented problem with snowmelt timing and infiltration. A new snow-physics scheme was developed for use in SSIB. In this, the snow layer is separated from the soil, with its own energy budget and temperature. Solar energy reaching the top of the snowpack is divided into three parts: one, reflected by the snow; two, absorbed by the snow; and three, transmitted to the ground following a simple extinction relation. Heat is exchanged between the ground and snow by conduction and by radiation through an arbitrary air-gap between them. In the GSWP exercise using the GEWEX ISLSCP Initiative I forcing data (hereafter "offline"), it was found that the new snow scheme ameliorated a significant fraction of snowmelt time-delay as compared to observations from satellite. It also produced warmer ground temperatures under the snowpack, which allowed realistic meltwater infiltration, resulting in better simulated spring soil moisture recharge and peak runoff amount as compared to observations. An ensemble of six June-July-August (JJA) simulations for 1987 and 1988 were performed with the NASA Goddard GEOS II GCM coupled with the new snow-physics SSIB using new initial soil moisture (ISM) from the offline simulations. The GCM produced more realistic precipitation in northern regions that had large snowmelt and wetter ISM in response to better snow-physics, as compared to simulations with ISM without the new snow scheme. The new SSiB-GCM also increased the interannual precipitation signal in the Indian monsoon region, resulting from changes in ISM in the Himalayas and central Asia.

Mocko, David M.; Sud, Y. C.

1999-01-01

55

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

NASA Astrophysics Data System (ADS)

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 and science textbooks are means to learn scientific content and convey a reductive and false image of the nature of science (NoS). Our main issue is to examine the possibility to communicate a more authentic image of NoS with HS. We begin by demonstrating how our historical and epistemological analysis led us to distinguish different learning goals about NoS. We then show how these goals can generate classroom activities involving collective inquiry based on the implementation of documents. These documents may or may not be paired with experiments. Finally, we discuss the tensions that our choices created with science curricula and among teachers.

Maurines, Laurence; Beaufils, Daniel

2013-06-01

56

Fabric contribution to sediment physical properties in Gulf of Mexico: Preliminary Results of IODP Expedition 308  

NASA Astrophysics Data System (ADS)

IODP Expedition 308 documented spatial distribution of fluid pressure, rock (sediments) properties, and geochemical and biological properties in the Gulf of Mexico. Existence of mass-transfer deposits (MTDs) composed of contorted sediments and highly homogenized sediments are essentials to document these variations especially in Site U1322B and U1324B, because their positions correspond to intervals that these properties are changed. This presentation will mention the detailed textural information and will construct relative strain intensities between two sites. MTDs of Unit Ib and Id in Site U1324B are lithologically and seismically correlatable to them in Site U1322B. However, MTDs in Site 1324B have minor-fabric variations compare with them in Site U1322B. On the other hand, they have major variations in Site U1322B. The intensity of grain alignments and onboard physical properties data such as porosity and shear strength show gradual change in the upper part of MTDs, while sudden change in the lowermost (Especially at the base of Unit I). These results indicate that mechanical and strain decoupling are completely occurred in the base of MTDs in Site U1322B. The preliminary interpretation based on the fabric analyses is; the MTDs preserve the initial state of slope failures in Site U1324B, while they reflect the long-distance transfer plausibly associated with high fluid pressure in site U1322B.

Yamamoto, Y.; Sawyer, D. E.; Behrmann, J. H.; Flemings, P. B.; John, C. M.

2005-12-01

57

Contrasts between chemical and physical estimates of baseflow help discern multiple sources of water contributing to rivers  

NASA Astrophysics Data System (ADS)

This study compares geochemical and physical methods of estimating baseflow in the upper reaches of the Barwon River, southeast Australia. Estimates of baseflow from physical techniques such as local minima and recursive digital filters are higher than those based on chemical mass balance using continuous electrical conductivity (EC). Between 2001 and 2011 the baseflow flux calculated using chemical mass balance is between 1.8 × 103 and 1.5 × 104 ML yr-1 (15 to 25% of the total discharge in any one year) whereas recursive digital filters yield baseflow fluxes of 3.6 × 103 to 3.8 × 104 ML yr-1 (19 to 52% of discharge) and the local minimum method yields baseflow fluxes of 3.2 × 103 to 2.5 × 104 ML yr-1 (13 to 44% of discharge). These differences most probably reflect how the different techniques characterise baseflow. Physical methods probably aggregate much of the water from delayed sources as baseflow. However, as many delayed transient water stores (such as bank return flow or floodplain storage) are likely to be geochemically similar to surface runoff, chemical mass balance calculations aggregate them with the surface runoff component. The mismatch between geochemical and physical estimates is greatest following periods of high discharge in winter, implying that these transient stores of water feed the river for several weeks to months. Consistent with these interpretations, modelling of bank storage indicates that bank return flows provide water to the river for several weeks after flood events. EC vs. discharge variations during individual flow events also imply that an inflow of low EC water stored within the banks or on the floodplain occurs as discharge falls. The joint use of physical and geochemical techniques allows a better understanding of the different components of water that contribute to river flow, which is important for the management and protection of water resources.

Cartwright, I.; Gilfedder, B.; Hofmann, H.

2013-05-01

58

Study of electronic properties in RCuAuxAl3 compounds, where R=Ce, La  

NASA Astrophysics Data System (ADS)

The magnetization, specific heat, electrical resistivity and magnetoresistance were measured on CeCuAuxAl3 compounds. The increase of structure parameters with substitution of Cu by larger atoms of Au was observed. Such a substitution causes a decrease of the Néel temperature as well as the Kondo temperature. The strong ferromagnetic correlations were found in the series, at least in the gold rich compounds. Nevertheless, all the compounds order antiferromagneticaly and no further phase transition was observed. The La counterparts were investigated by means of electrical resistivity and their basic physical properties are presented as well.

Klicpera, M.; Javorský, P.

2014-08-01

59

Contribution of Structured Exercise Class Participation and Informal Walking for Exercise to Daily Physical Activity in Community-Dwelling Older Adults.  

ERIC Educational Resources Information Center

Examined the physical activity and exercise habits of independent-living older adults from a structured exercise program, noting the contribution of formal and informal exercise participation relative to total daily physical activity measured using pedometer and daily activity logs. Participation in structured exercise was an important contributor…

Tudor-Locke, C.; Jones, G. R.; Myers, A. M.; Paterson, D. H.; Ecclestone, N. A.

2002-01-01

60

REVIEW: The contribution of medical physics to the development of psoralen photochemotherapy (PUVA) in the UK: a personal reminiscence  

NASA Astrophysics Data System (ADS)

Psoralen photochemotherapy (PUVA) is the combined treatment of skin disorders with a photosensitizing drug (Psoralen) and UltraViolet A radiation. The introduction of PUVA therapy has arguably been the most important development in dermatology over the past 30 years and from the first days of the treatment being introduced in the UK, British medical physicists were an integral part of the effort to establish it. Medical physicists have contributed to this development in a number of ways, from designing irradiation units in the early days of the technique, through to collaborating with dermatologists in prosecuting clinical and experimental studies aimed at improving patient outcomes. That the dose of UVA radiation is administered quantitatively, and not qualitatively, has probably been the single most important contribution made by several medical physicists over this period. However, despite concerns that were expressed almost 30 years ago about the accuracy with which UVA doses are administered to patients, the medical physics community still has some way to go before we can be satisfied that statements about UVA irradiance and dose can be made with confidence.

Diffey, Brian

2006-07-01

61

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

62

Physical and biological contributions to the western tropical North Atlantic Ocean carbon sink formed by the Amazon River plume  

NASA Astrophysics Data System (ADS)

Dissolved inorganic carbon (DIC) and total alkalinity (TA) were measured in the upper 1000 m of the western tropical North Atlantic Ocean (WTNA; study area 3-15°N, 40-59°W) in January-February and July-August 2001. Concentrations of DIC and TA in surface samples (0-10 m) influenced by the Amazon River plume were up to 400 ?mol C kg-1 (˜20%) lower than oceanic surface samples. In this region, physical dilution by river water dominates DIC and TA inventories, driving CO2 partial pressure (pCO2) well below atmospheric levels. Nevertheless, DIC concentrations at most plume-influenced stations were 10-90 ?mol C kg-1 below levels expected from conservative mixing of seawater with low-salinity, low-CO2 Amazon River water. In this otherwise oligotrophic region, the diazotrophs Trichodesmium spp. and Richelia intracellularis were often abundant, supporting a link between increased carbon drawdown and nitrogen fixation in the outer plume. Net community production in the plume must surpass the fluxes of inorganic carbon from below and air-sea CO2 replacement to leave biologically mediated DIC deficits, which is possible under observed conditions. Biological activity lowers plume pCO2 30-120 ?atm below the conservative mixing line, and contributes to a CO2 deficit in the northern WTNA that outlasts the plume's physical structure.

Cooley, S. R.; Yager, P. L.

2006-08-01

63

Soins Aux Brules Apres Un Accident Nucleaire  

PubMed Central

Summary Les lésions radiques sont dues le plus souvent à des radio-isotopes utilisés dans l’industrie. L’explosion d’un réacteur nucléaire, les armes nucléaires ou une attaque terroriste constituent un risque d’afflux massif de victimes brûlées. Les radiations ionisantes occasionnent des brûlures thermiques, des syndromes d’irradiation aiguë avec pancytopénie et des signes cutanés retardés. Après une période de latence, des symptômes cutanés apparaissent et leur profondeur est proportionnelle à la dose reçue. Les protocoles habituels de réanimation des brûlés s’appliquent ici. Les soins aux irradiés nécessitent aussi une mesure de l’irradiation et une décontamination par des personnels entraînés. En cas de catastrophe nucléaire, la priorité est d’optimiser les structures existantes et de préserver les moyens pour les patients ayant la plus forte probabilité de survie. Après un accident nucléaire isolé, les difficultés dans les centres de brûlés sont l’évaluation de la profondeur et les techniques chirurgicales de couverture cutanée. La préparation des moyens médicaux et des centres de brûlés est nécessaire pour faire face à la prise en charge de ces brûlures différentes et complexes.

Bargues, L.; Donat, N.; Jault, P.; Leclerc, T.

2010-01-01

64

Un système de détection à pixels tolérant aux rayonnements pour les expériences ALICE et LHCb au CERN  

Microsoft Academic Search

Le travail présenté dans cette thèse a été effectué au sein du groupe Microélectronique du CERN, le laboratoire européen pour la physique des particules. Il s’agit d’un laboratoire situé près de Genève en Suisse, il a été créé dans les années 50 pour donner aux scientifiques européens les moyens d'étudier la physique des hautes énergies (HEP, High Energy Physics). Grâce

Roberto Dinapoli; Jean Gasiot

2004-01-01

65

[Physical and chemical characteristics of fine particles emitted from cooking emissions and its contribution to particulate organic matter in Beijing].  

PubMed

This paper investigated the current status of Beijing restaurants, conducting measurements of cooking emission from 4 kinds of typical Chinese restaurants with different cooking styles in Beijing. Mass concentration, morphology and chemical compositions of PM2.5 were analyzed based on filter samples. Mass concentrations of cooking source are about 8 - 35 times of those of ambient air simultaneously. Both PM1.0 and PM2.5 emitted from the restaurants were monitored by on-line equipment, and PM1.0 took 50% - 85% of PM2.5 in mass concentration. Particles emitted from cooking source are mostly in solid and liquid morphology. Chemical concentrations of organic matter, inorganic ions and elemental carbon account for about 70%, 5% - 11%, and less than 2%, respectively. The total amount of fine particles emitted by cooking source and its contribution to total POM for Beijing are roughly estimated. POM in fine particles from cooking source is approximately the same magnitude as transportation source emission and becomes one of the main sources of POM in fine particles in Beijing. Therefore it's quite urgent to understand the physical and chemical characteristics of cooking emission in order to improve Beijing air quality and secure residents' health. PMID:18290493

Wen, Meng-Ting; Hu, Min

2007-11-01

66

Changes in auxin response from mutations in an AUX/IAA gene.  

PubMed

Transcription of the AUX/IAA family of genes is rapidly induced by the plant hormone auxin, but evidence that AUX/IAA genes mediate further responses to auxin has been elusive. Changes in diverse auxin responses result from mutations in the Arabidopsis AXR3 gene. AXR3 was shown to be a member of the AUX/IAA family, providing direct evidence that AUX/IAA genes are central in auxin signaling. Molecular characterization of axr3 gain-of-function and loss-of-function mutations established the functional importance of domains conserved among AUX/IAA proteins. PMID:9478901

Rouse, D; Mackay, P; Stirnberg, P; Estelle, M; Leyser, O

1998-02-27

67

A Physical Model for the Evolving Ultraviolet Luminosity Function of High Redshift Galaxies and their Contribution to the Cosmic Reionization  

NASA Astrophysics Data System (ADS)

We present a physical model for the evolution of the ultraviolet (UV) luminosity function of high-redshift galaxies, taking into account in a self-consistent way their chemical evolution and the associated evolution of dust extinction. Dust extinction is found to increase fast with halo mass. A strong correlation between dust attenuation and halo/stellar mass for UV selected high-z galaxies is thus predicted. The model yields good fits of the UV and Lyman-? (Ly?) line luminosity functions at all redshifts at which they have been measured. The weak observed evolution of both luminosity functions between z = 2 and z = 6 is explained as the combined effect of the negative evolution of the halo mass function; of the increase with redshift of the star formation efficiency due to the faster gas cooling; and of dust extinction, differential with halo mass. The slope of the faint end of the UV luminosity function is found to steepen with increasing redshift, implying that low luminosity galaxies increasingly dominate the contribution to the UV background at higher and higher redshifts. The observed range of the UV luminosities at high z implies a minimum halo mass capable of hosting active star formation M crit <~ 109.8 M ?, which is consistent with the constraints from hydrodynamical simulations. From fits of Ly? line luminosity functions, plus data on the luminosity dependence of extinction, and from the measured ratios of non-ionizing UV to Lyman-continuum flux density for samples of z ~= 3 Lyman break galaxies and Ly? emitters, we derive a simple relationship between the escape fraction of ionizing photons and the star formation rate. It implies that the escape fraction is larger for low-mass galaxies, which are almost dust-free and have lower gas column densities. Galaxies already represented in the UV luminosity function (M UV <~ -18) can keep the universe fully ionized up to z ~= 6. This is consistent with (uncertain) data pointing to a rapid drop of the ionization degree above z ~= 6, such as indications of a decrease of the comoving emission rate of ionizing photons at z ~= 6, a decrease of sizes of quasar near zones, and a possible decline of the Ly? transmission through the intergalactic medium at z > 6. On the other hand, the electron scattering optical depth, ?es, inferred from cosmic microwave background (CMB) experiments favor an ionization degree close to unity up to z ~= 9-10. Consistency with CMB data can be achieved if M crit ~= 108.5 M ?, implying that the UV luminosity functions extend to M UV ~= -13, although the corresponding ?es is still on the low side of CMB-based estimates.

Cai, Zhen-Yi; Lapi, Andrea; Bressan, Alessandro; De Zotti, Gianfranco; Negrello, Mattia; Danese, Luigi

2014-04-01

68

Industrie manufacturière : de l'investissement aux capacités de production  

Microsoft Academic Search

[fre] Industrie manufacturière : de l'investissement aux capacités de production . Dès le début de l'année 1 994, l'activité industrielle a bénéficié d'une reprise très vigoureuse. En revanche, la reprise de l'investissement semble tarder à se développer. Dans ce contexte, les capacités de production industrielles seront-elles suffisantes pour consolider la croissance et autoriser son accélération ? . Les flux d'investissement

Séverine Mayo; Marie Reynaud

1995-01-01

69

Scaling up of physical activity interventions in Brazil: how partnerships and research evidence contributed to policy action  

PubMed Central

The global health burden due to physical inactivity is enormous and growing. There is a need to consider new ways of generating evidence and to identify the role of government in promoting physical activity at the population level. In this paper, we summarize key findings from a large-scale cross-national collaboration to understand physical activity promotion in Brazil. We describe the main aspects of the partnership of Project GUIA (Guide for Useful Interventions for Activity in Brazil and Latin America) that sustained the collaborative effort for eight years and describe how the evidence gathered from the collaboration triggered political action in Brazil to scale up a physical activity intervention at the national level. Project GUIA is a cross-national multidisciplinary research partnership designed to understand and evaluate current efforts for physical activity promotion at the community level in Latin America. This example of scaling up is unprecedented for promoting health in the region and is an example that must be followed and evaluated.

Hoehner, Christine M.; Hallal, Pedro C.; Reis, Rodrigo S.; Simoes, Eduardo J.; Malta, Deborah C.; Pratt, Michael; Brownson, Ross C.

2013-01-01

70

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

71

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

72

Le problème de la fusion de coopératives agricoles aux Etats-Unis  

Microsoft Academic Search

[fre] Le gouvernement américain poursuit une politique favorable à la création et à la croissance des coopératives agricoles. . Avant d'opérer une fusion, les coopératives doivent d'abord résoudre les problèmes relatifs aux personnes et aux finances ; les plus grandes peuvent rencontrer des difficultés juridiques dues aux lois anti-trusts. L'efficacité est la condition essentielle du succès de l'intégration. . Il

Hugh L. Cook

1965-01-01

73

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

74

Physics  

NSDL National Science Digital Library

Physics is the scientific study of the basic principles of the universe, including matter, energy, motion and force, and their interactions. Major topics include classical mechanics, thermodynamics, light and optics, electromagnetism and relativity.

K-12 Outreach,

75

Inner stationary phase point contribution of physical optic in terms of the modified edge representation line integrals (curved surfaces)  

Microsoft Academic Search

The unique concept of the modified edge representation (MER) was proposed for the surface to the line integral reduction of the physical optic (PO). The equivalence between the MER line and the PO surface integration was analytically derived by using the Stokes theorem relations as well as asymptotic treatments, for the smooth scattering surfaces without inner stationary phase points (SPP).

Luis Rodriguez; Koji Yukimasa; Tetsu Shijo; Makoto Ando

2007-01-01

76

Formation Stellaire Aux Échelles Des Galaxies  

NASA Astrophysics Data System (ADS)

Star Formation is at the very core of the evolution of galaxies. From their gas reservoir (filled by infall or fusions), stars form at the "Star Formation Rate" (SFR), with an enormous impact on many aspects of the evolution of galaxies. This HDR presents first the formalism concerning star formation (SFR, IMF), some theoretical suggestions on physical processes that may affect star formation on various galactic scales, and the methods used to determine the SFR from observations. A large part is dedicated to the "Star Formation Laws" (e.g. Schmidt law) on various scales (local, radial, and global law). Finally, the last part concerns the largest scales (evolution of the "cosmic" SFR and effect of the environment).

Boissier, S.

2012-12-01

77

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

PubMed

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 auxin-responsive Aux/IAA genes, termed FaAux/IAA1 and FaAux/IAA2 respectively, were isolated and characterized from strawberry fruit. Moreover, the expression profiles of two FaAux/IAA genes during fruit development, and the effect of naphthalene acetic acid (NAA) on their expressions of fruits at two different developmental stages were also investigated. The results showed that the levels of FaAux/IAA1 and FaAux/IAA2 transcripts were very high at early stage of fruit development, and decreased sharply at ripening stage (after white stage). In addition, NAA applied at the stage of large green and white fruit obviously increased the accumulations of FaAux/IAA1 and FaAux/IAA2 transcripts. These data suggested that the expressions of both FaAux/IAA1 and FaAux/IAA2 genes were likely to be involved in early fruit development, and the enhancement of FaAux/IAAs transcripts might be attributed at least or partially to auxin-induced fruit growth and delayed fruit ripening of strawberry. PMID:20563652

Liu, Du-juan; Chen, Jian-ye; Lu, Wang-jin

2011-02-01

78

Structure-Function Analysis of the Presumptive Arabidopsis Auxin Permease AUX1W?  

PubMed Central

We have investigated the subcellular localization, the domain topology, and the amino acid residues that are critical for the function of the presumptive Arabidopsis thaliana auxin influx carrier AUX1. Biochemical fractionation experiments and confocal studies using an N-terminal yellow fluorescent protein (YFP) fusion observed that AUX1 colocalized with plasma membrane (PM) markers. Because of its PM localization, we were able to take advantage of the steep pH gradient that exists across the plant cell PM to investigate AUX1 topology using YFP as a pH-sensitive probe. The YFP-coding sequence was inserted in selected AUX1 hydrophilic loops to orient surface domains on either apoplastic or cytoplasmic faces of the PM based on the absence or presence of YFP fluorescence, respectively. We were able to demonstrate in conjunction with helix prediction programs that AUX1 represents a polytopic membrane protein composed of 11 transmembrane spanning domains. In parallel, a large aux1 allelic series containing null, partial-loss-of-function, and conditional mutations was characterized to identify the functionally important domains and amino acid residues within the AUX1 polypeptide. Whereas almost all partial-loss-of-function and null alleles cluster in the core permease region, the sole conditional allele aux1-7 modifies the function of the external C-terminal domain.

Swarup, Ranjan; Kargul, Joanna; Marchant, Alan; Zadik, Daniel; Rahman, Abidur; Mills, Rebecca; Yemm, Anthony; May, Sean; Williams, Lorraine; Millner, Paul; Tsurumi, Seiji; Moore, Ian; Napier, Richard; Kerr, Ian D.; Bennett, Malcolm J.

2004-01-01

79

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

80

Physical, biophysical, and cell-biological factors that can contribute to enhanced neoplastic transformation by fission-spectrum neutrons.  

PubMed

In radiobiology, fission-spectrum neutrons frequently have been used as a surrogate for other high-LET radiations, particularly when thick absorbers were involved as in animal studies. However, the spectrum of proton secondaries, plus the gamma rays generated in the absorption processes, suggests that a characterization of such a beam, based upon an average LET alone, may not adequately account for the spectrum of biological properties that it may have. Conflicting results have been reported on the relative effectiveness of reduced dose rates of fission-spectrum neutrons, and other high-LET radiations, for the induction of noeplastic transformation of cells in culture. Enhanced rates of neoplastic transformation were reported for C3H 10T1/2 mouse cells, Syrian hamster embryo cells, and human hybrid cells-all with the same beam of fission-spectrum neutrons generated by the JANUS reactor at the Argonne National Laboratory. No enhancement was observed with C3H 10T1/2 cells exposed to the beam from the TRIGA reactor at the Armed Forces Radiobiological Research Institute, or to maximally effective alpha particles. The recent report that an enhancement was also observed when human hybrid cells were exposed at a low dose rate to the TRIGA beam indicated that physical factors alone were not responsible for the differences observed with C3H 10T1/2 cells exposed to these various beams. To resolve the lack of consistency in the results that had been reported, a biophysical model was developed based, in part, on the existence of a narrow age interval in the growth cycle of a cell during which it is particularly sensitive to radiation neoplastic transformation. Because of the special physical and biological properties of cells in M phase, and/or in late G2 phase or early G1 phase, these cohorts of cells were proposed as those that are hypersensitive to neoplastic transformation by radiation. PMID:1924748

Elkind, M M

1991-10-01

81

The contribution of comets in Near-Earth Object and Main Belt populations and the role of collisions in the physical properties of members of these populations.  

NASA Astrophysics Data System (ADS)

The population of Near-Earth Objects (NEOs) is composed of small bodies of various origins. Groundbased observational programs have been developed to perform their inventory and to determine their physical properties. However, these observations contain many biases and the total population of NEOs with diameters down to a few hundreds of meters has not been identified yet. In recent years, the main sources of NEOs have been characterized [1]. Most of these bodies come from the asteroid main belt and the Jupiter-family comets and their source regions are linked to transport mechanisms (mean motion and secular resonances, slow diffusion mechanisms) to the NEO-space. It has then been possible to construct a complete model of the steady-state orbital, size and albedo distribution of NEOs and to determine the level of contribution of each of their sources, including the contribution of Jupiter-family comets. However, nothing is known regarding the contribution of longperiod comets. Physical observations have been conducted in order to identify potential dormant or extinct comets among small bodies in the NEO population and to determine the fraction of "comet candidates within the total NEO population. Combining the results of these observations with our model of NEO population to evaluate source region probabilities [1], it was found that 8 +/- 5% of the total asteroid-like NEO population may have originated as comets from the outer Solar System [2]. In the population of Main Belt (MB) asteroids, three members are known to display transient comet-like physical characteristics, including prolonged periods of dust emission leading to the formation of radiation pressure-swept tails [3]. These physical properties are most naturally explained as the result of sub-limation of near-surface ice from what are, dynamically, mainbelt asteroids (hence the name "main-belt comets" (MBCs) or, equivalently "icy asteroids"). No pausible dynamical path to the asteroid belt from the cometary reservoirs in the Oort cloud or Kuiper belt has been established. Thus, we may have an unsuspected icy region closer to the Sun than expected. However, it has also been suggested that numerous comets may have been captured during a violent period of planetary orbital evolution in the early stages of our Solar System [4]. Most of these bodies experience collisions during their lifetime, which can either disrupt them or modify their physical properties. In particular, collisions are suspected to be the triggering mechanism for the activation of MBCs. Thus the collisional process needs a good understanding in order to determine its contribution in the evolution of these small bodies, as a function of their physical properties. We have recently made a major improvement in the simulations of a small body disruption by introducing a model of fragmentation of porous material which will allows us to study the impact process on cometary bodies [5]. Moreover, for bodies dominated by gravity, our simulations includes the explicit computation of the formation of aggregates during the gravitational reaccumulation of small fragments, allowing us to obtain information on their spin, the number of boulders composing them or lying on their surface, and their shape. We will present the first and preliminary results of this process taking as examples some asteroid families that we reproduced successfully with our previous simulations [6], [7], [8], [9], [10], and their possible implications on the properties of small bodies generated by a disruption. Such information can for instance be compared with data provided by the Japanese space mission Hayabusa of the asteroid Itokawa, a body now understood to be a fragment of a larger parent body. For the population of comets, improving our understanding of their collisional response can then allow us to better characterize their collisional evolution, lifetime and other properties [11] which can have some implications on their contribution in "asteroidal" populations. It is also clear that future s

Michel, P.

2008-09-01

82

Auxin regulates SCF(TIR1)-dependent degradation of AUX/IAA proteins.  

PubMed

The plant hormone auxin is central in many aspects of plant development. Previous studies have implicated the ubiquitin-ligase SCF(TIR1) 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 SCF(TIR1) decrease auxin response. Here we show that SCF(TIR1) is required for AUX/IAA degradation. We demonstrate that SCF(TIR1) interacts with AXR2/IAA7 and AXR3/IAA17, and that domain II of these proteins is necessary and sufficient for this interaction. Further, auxin stimulates binding of SCF(TIR1) to the AUX/IAA proteins, and their degradation. Because domain II is conserved in nearly all AUX/IAA proteins in Arabidopsis, we propose that auxin promotes the degradation of this large family of transcriptional regulators, leading to diverse downstream effects. PMID:11713520

Gray, W M; Kepinski, S; Rouse, D; Leyser, O; Estelle, M

2001-11-15

83

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

84

The aux1 Mutation of Arabidopsis Confers Both Auxin and Ethylene Resistance 12  

PubMed Central

Mutagenized populations of Arabidopsis thaliana seedlings were screened for plants capable of root growth on inhibitory concentrations of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid. Four of the mutant lines recovered from this screen display a defect in root gravitropism as well as hormone resistance. The aerial portions of these plants are similar to wild-type in appearance. Genetic analysis of these four mutants demonstrated that hormone resistance segregated as a recessive trait and that all four mutations were alleles of the auxin-resistant mutation aux1 [Maher HP, Martindale SJB (1980) Biochem Genet 18: 1041-1053]. These new mutants have been designated aux1-7, 1-12, 1-15, and 1-19. The sensitivity of wild-type and aux1-7 roots to indole-3-acetic acid, 2,4-dichlorophenoxyacetic acid, and ethylene was determined. The results of these assays show that aux1-7 plants require a 12-fold (indole-3-acetic acid) or 18-fold (2,4-dichlorophenoxyacetic acid) higher concentration of auxin than wild-type for a 50% inhibition of root growth. In addition, ethylene inhibition of root growth in aux1-7 plants is approximately 30% that of wild-type at saturating ethylene concentrations. These results indicate that aux1 plants are resistant to both auxin and ethylene. We have also determined the effect of ethylene treatment on chlorophyll loss and peroxidase activity in the leaves of aux1 and wild-type plants. No difference between mutant and wild-type plants was observed in these experiments, indicating that hormone resistance in aux1 plants may be limited to root growth. Our studies suggest that the AUX1 gene may have a specific function in the hormonal regulation of gravitropism.

Pickett, F. Bryan; Wilson, Allison K.; Estelle, Mark

1990-01-01

85

Einstein's contributions to atomic physics  

Microsoft Academic Search

Many of the epoch-breaking papers that have been published by Einstein are remembered today as treatises dealing with various isolated phenomena rather than as direct consequences of a new unified world view. This paper traces the various ways in which ten papers published by Einstein during the period 1905-1925 influenced the development of the modern atomic paradigm, and illustrates how

Lorenzo J Curtis

2009-01-01

86

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

87

Chromosaponin I Specifically Interacts with AUX1 Protein in Regulating the Gravitropic Response of Arabidopsis Roots  

Microsoft Academic Search

We have found that chromosaponin I (CSI), a g-pyronyl-triterpenoid saponin isolated from pea (Pisum sativum L. cv Alaska), specifically interacts with AUX1 protein in regulating the gravitropic response of Arabidopsis roots. Application of 60 mm CSI disrupts the vertically oriented elongation of wild-type roots grown on agar plates but orients the elongation of agravitropic mutant aux1-7 roots toward the gravity.

Abidur Rahman; Arifa Ahamed; Taisaku Amakawa; Nobuharu Goto; Seiji Tsurumi

2001-01-01

88

Anisotropy of the magnetic susceptibility of CeCu6-xAux near the quantum phase transition  

NASA Astrophysics Data System (ADS)

We report on the low-temperature dc magnetic susceptibility of CeCu6-xAux(x=0.1) in very small fields B=100 ?T and 1 mT. For x=0.1, i.e. for the quantum critical concentration, we confirm the anomalous exponent ? of the susceptibility along the easy c-direction, ?c-1??+T? with ?=0.8 observed previously in moderate fields B=100 mT (see, A. Schröder, et al., Nature 407 (2000) 351). However, below 240 mK we see a clear additional contribution to ?c. At the lowest measuring temperature T=40 mK, the ratio ?c:?a:?b=4:1.5:1 of the susceptibility anisotropy is weaker than at higher T where the ratio is 10:2:1. This is caused by a steeper increase of ?a and ?b as compared to ?c.

Tomanic, T.; Hamann, A.; Löhneysen, H. v.

2008-04-01

89

Auxin-induced SCFTIR1Aux\\/IAA interaction involves stable modification of the SCFTIR1 complex  

Microsoft Academic Search

The plant hormone auxin can regulate gene expression by destabilizing members of the Aux\\/IAA family of transcriptional repressors. Auxin-induced Aux\\/IAA degradation requires the protein-ubiquitin ligase SCFTIR1, with auxin acting to enhance the interaction between the Aux\\/IAAs and SCFTIR1. SKP1, Cullin, and an F-box-containing protein (SCF)-mediated degradation is an important component of many eukaryotic signaling pathways. In all known cases to

Stefan Kepinski; Ottoline Leyser

2004-01-01

90

Are the New Physics Contributions from the Left-Right Symmetric Model Important for the Indirect CP Violation in the Neutral B Mesons?  

NASA Astrophysics Data System (ADS)

Several works analyzing the new physics contributions from the Left-Right Symmetric Model to the CP violation phenomena in the neutral B mesons can be found in the literature. These works exhibit interesting and experimentally sensible deviations from the Standard Model predictions but at the expense of considering a low right scale \\upsilon_R around 1 TeV. However, when we stick to the more conservative estimates for \\upsilon_R which say that it must be at least 10^7 GeV, no experimentally sensible deviations from the Standard Model appear for indirect CP violation. This estimate for \\upsilon_R arises when the generation of neutrino masses is considered. In spite of the fact that this scenario is much less interesting and says nothing new about both the CP violation phenomenon and the structure of the Left-Right Symmetric Model, this possibility must be taken into account for the sake of completeness and when considering the see-saw mechanism that provides masses to the neutrino sector.

Rodríguez, Yeinzon; Quimbay, Carlos

2005-11-01

91

Appraisal of Multiple-Scale Land Cover and Site-Level Physical Factors on the Contribution of Terrestrial Invertebrates to Stream Ecosystems  

NASA Astrophysics Data System (ADS)

There is a growing body of literature emphasizing the importance of terrestrial invertebrates to the structure and function of stream ecosystems, mainly as an energy subsidy for stream fish. The input of terrestrial invertebrates from the riparian area of streams may be linked to the vegetation type and land use of the riparian area. To test this, terrestrial invertebrates falling into streams were collected with floating pan traps. These data were combined with a GIS model of surrounding land use composition, assessed at multiple spatial scales in 12 northeast Ohio streams. A site-level index of habitat quality was used to evaluate local stream characteristics to determine the scale at which factors influencing terrestrial invertebrate input are most prominent. Correlation analysis showed the strongest relationships between the amount of shrub/scrub vegetation near the stream and invertebrate diversity and the ratio of terrestrial-derived to aquatic-derived invertebrates caught in the pan traps. These relationships were significant at multiple spatial scales up to 5000 m. Site-level physical features that correlated with terrestrial invertebrate input included stream gradient and substrate quality. The results show that the contribution of terrestrial invertebrates to streams is related to land use beyond the immediate riparian area.

Deeds, J. C.; Carlson, R. E.

2005-05-01

92

Réactions aux interfaces de bicristaux compatibles et incompatibles  

NASA Astrophysics Data System (ADS)

La rupture intergranulaire peut apparaître suite à la non accommodation des contraintes au voisinage de l'interface. La transmission du glissement au travers d'une interface est un des modes de relaxation possible qui dépend des paramètres suivants : facteurs géométriques (caractéristiques de l'interface et systèmes de glissement activés), constantes élastiques de chacune des phases. Dans cette étude, la microscopie électronique à transmission (MET) est utilisée pour analyser les configurations de dislocations résultant d'une déformation par fatigue de bicristaux d'acier austénoferritique de désorientations contrôlées. Deux types de bicristaux sont étudiés, compatible et incompatible plastiquement. Pour chacun d'eux, la déformation est initiée soit dans la phase ferritique ? soit dans la phase austénitique ? selon la localisation d'une entaille préalable à l'essai mécanique. Les résultats permettent de remonter aux mécanismes élémentaires qui régissent le transfert “direct” ou “indirect” des dislocations à travers l'interface. Une corrélation avec le comportement des bicristaux à l'échelle macroscopique est également tentée.

Taisne, A.; Décamps, B.; Priester, L.

2003-03-01

93

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

94

Evidence supporting an intentional Neandertal burial at La Chapelle-aux-Saints  

PubMed Central

The bouffia Bonneval at La Chapelle-aux-Saints is well known for the discovery of the first secure Neandertal burial in the early 20th century. However, the intentionality of the burial remains an issue of some debate. Here, we present the results of a 12-y fieldwork project, along with a taphonomic analysis of the human remains, designed to assess the funerary context of the La Chapelle-aux-Saints Neandertal. We have established the anthropogenic nature of the burial pit and underlined the taphonomic evidence of a rapid burial of the body. These multiple lines of evidence support the hypothesis of an intentional burial. Finally, the discovery of skeletal elements belonging to the original La Chapelle aux Saints 1 individual, two additional young individuals, and a second adult in the bouffia Bonneval highlights a more complex site-formation history than previously proposed.

Rendu, William; Beauval, Cedric; Crevecoeur, Isabelle; Bayle, Priscilla; Balzeau, Antoine; Bismuth, Thierry; Bourguignon, Laurence; Delfour, Geraldine; Faivre, Jean-Philippe; Lacrampe-Cuyaubere, Francois; Tavormina, Carlotta; Todisco, Dominique; Turq, Alain; Maureille, Bruno

2014-01-01

95

Evidence supporting an intentional Neandertal burial at La Chapelle-aux-Saints.  

PubMed

The bouffia Bonneval at La Chapelle-aux-Saints is well known for the discovery of the first secure Neandertal burial in the early 20th century. However, the intentionality of the burial remains an issue of some debate. Here, we present the results of a 12-y fieldwork project, along with a taphonomic analysis of the human remains, designed to assess the funerary context of the La Chapelle-aux-Saints Neandertal. We have established the anthropogenic nature of the burial pit and underlined the taphonomic evidence of a rapid burial of the body. These multiple lines of evidence support the hypothesis of an intentional burial. Finally, the discovery of skeletal elements belonging to the original La Chapelle aux Saints 1 individual, two additional young individuals, and a second adult in the bouffia Bonneval highlights a more complex site-formation history than previously proposed. PMID:24344286

Rendu, William; Beauval, Cédric; Crevecoeur, Isabelle; Bayle, Priscilla; Balzeau, Antoine; Bismuth, Thierry; Bourguignon, Laurence; Delfour, Géraldine; Faivre, Jean-Philippe; Lacrampe-Cuyaubère, François; Tavormina, Carlotta; Todisco, Dominique; Turq, Alain; Maureille, Bruno

2014-01-01

96

A Meta-Analytic Review of the Theories of Reasoned Action and Planned Behavior in Physical Activity: Predictive Validity and the Contribution of Additional Variables.  

ERIC Educational Resources Information Center

Examined relations between behavior, intentions, attitudes, subjective norms, perceived behavioral control, self-efficacy, and past behaviors using the Theories of Reasoned Action (TRA) and Planned Behavior (TPB) in physical activity. This quantitative integration of the physical activity literature supported the major relationships of the…

Hagger, Martin S.; Chatzisarantis, Nikos L. D.; Biddle, Stuart J. H.

2002-01-01

97

Auxin-induced SCFTIR1-Aux/IAA interaction involves stable modification of the SCFTIR1 complex.  

PubMed

The plant hormone auxin can regulate gene expression by destabilizing members of the Aux/IAA family of transcriptional repressors. Auxin-induced Aux/IAA degradation requires the protein-ubiquitin ligase SCF(TIR1), with auxin acting to enhance the interaction between the Aux/IAAs and SCF(TIR1). SKP1, Cullin, and an F-box-containing protein (SCF)-mediated degradation is an important component of many eukaryotic signaling pathways. In all known cases to date, the interaction between the targets and their cognate SCFs is regulated by signal-induced modification of the target. The mechanism by which auxin promotes the interaction between SCF(TIR1) and Aux/IAAs is not understood, but current hypotheses propose auxin-induced phosphorylation, hydroxylation, or proline isomerization of the Aux/IAAs. We found no evidence to support these hypotheses or indeed that auxin induces any stable modification of Aux/IAAs to increase their affinity for SCF(TIR1). Instead, we present data suggesting that auxin promotes the SCF(TIR1)-Aux/IAA interaction by affecting the SCF component, TIR1, or proteins tightly associated with it. PMID:15295098

Kepinski, Stefan; Leyser, Ottoline

2004-08-17

98

Identification and Analyses of AUX-IAA target genes controlling multiple pathways in developing fiber cells of Gossypium hirsutum L  

PubMed Central

Technological development led to an increased interest in systems biological approaches in plants to characterize developmental mechanism and candidate genes relevant to specific tissue or cell morphology. AUX-IAA proteins are important plant-specific putative transcription factors. There are several reports on physiological response of this family in Arabidopsis but in cotton fiber the transcriptional network through which AUX-IAA regulated its target genes is still unknown. in-silico modelling of cotton fiber development specific gene expression data (108 microarrays and 22,737 genes) using Algorithm for the Reconstruction of Accurate Cellular Networks (ARACNe) reveals 3690 putative AUX-IAA target genes of which 139 genes were known to be AUX-IAA co-regulated within Arabidopsis. Further AUX-IAA targeted gene regulatory network (GRN) had substantial impact on the transcriptional dynamics of cotton fiber, as showed by, altered TF networks, and Gene Ontology (GO) biological processes and metabolic pathway associated with its target genes. Analysis of the AUX-IAA-correlated gene network reveals multiple functions for AUX-IAA target genes such as unidimensional cell growth, cellular nitrogen compound metabolic process, nucleosome organization, DNA-protein complex and process related to cell wall. These candidate networks/pathways have a variety of profound impacts on such cellular functions as stress response, cell proliferation, and cell differentiation. While these functions are fairly broad, their underlying TF networks may provide a global view of AUX-IAA regulated gene expression and a GRN that guides future studies in understanding role of AUX-IAA box protein and its targets regulating fiber development.

Nigam, Deepti; Sawant, Samir V

2013-01-01

99

Degradation of Aux/IAA proteins is essential for normal auxin signalling.  

PubMed

The growth substance auxin mediates many cellular processes, including division, elongation and differentiation. PSIAA6 is a member of the Aux/IAA family of short-lived putative transcriptional regulators that share four conserved domains and whose mRNAs are rapidly induced in the presence of auxin. Here PSIAA6 was shown to serve as a dominant transferable degradation signal when present as a translational fusion with firefly luciferase (LUC), with an in vivo half-life of 13.5 min in transgenic Arabidopsis seedlings. In a transient assay system in tobacco protoplasts using steady-state differences as an indirect measure of protein half-life, LUC fusions with full-length PSIAA6 and IAA1, an Aux/IAA protein from Arabidopsis, resulted in protein accumulations that were 3.5 and 1. 0%, respectively, of that with LUC alone. An N-terminal region spanning conserved domain II of PSIAA6 containing amino acids 18-73 was shown to contain the necessary cis-acting element to confer low protein accumulation onto LUC, while a fusion protein with PSIAA6 amino acids 71-179 had only a slight effect. Single amino acid substitutions of PSIAA6 in conserved domain II, equivalent to those found in two alleles of axr3, a gene that encodes Aux/IAA protein IAA17, resulted in a greater than 50-fold increase in protein accumulation. Thus, the same mutations resulting in an altered auxin response phenotype increase Aux/IAA protein accumulation, providing a direct link between these two processes. In support of this model, transgenic plants engineered to over-express IAA17 have an axr3-like phenotype. Together, these data suggest that rapid degradation of Aux/IAA proteins is necessary for a normal auxin response. PMID:10758506

Worley, C K; Zenser, N; Ramos, J; Rouse, D; Leyser, O; Theologis, A; Callis, J

2000-03-01

100

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

101

Charged Particles are Prevented from Going Faster than the Speed of Light by Light Itself: A Biophysical Cell Biologist's Contribution to Physics  

Microsoft Academic Search

Investigations of living organisms have led biologists and physicians to introduce fundamental concepts, including Brownian motion, the First Law of Thermodynamics, Poiseuille's Law of fluid flow, and Fick's Law of diffusion into physics. Given the prominence of viscous forces within and around cells and the experience of identifying and quantifying such resistive forces, biophysical cell biologists have an unique perspective

Randy Wayne

2011-01-01

102

Thinking Differently about Curriculum: Analysing the Potential Contribution of Physical Education as Part of "Health and Wellbeing" during a Time of Revised Curriculum Ambitions in Scotland  

ERIC Educational Resources Information Center

Purpose: Following an explanation of the current policy context the paper addresses three particularly pressing challenges: the curriculum focus for physical education as part of health and wellbeing; the major implications for subject knowledge; and how translating curriculum change into professional learning and practice might feasibly occur. In…

Thorburn, Malcolm; Jess, Mike; Atencio, Matthew

2011-01-01

103

Contribution of the starch, protein, and lipid fractions to the physical, thermal, and structural properties of amaranth (Amaranthus caudatus) flour films.  

PubMed

Amaranth protein-lipid (PL) and protein (P) films were elaborated and compared with amaranth flour films in order to determine the contribution of the interactions between the biopolymer (starch and protein) and the lipids to the film properties. The films were made by the casting method, using the same glycerol concentration (0.9 g glycerol/100 g solution). A separation of the lipid fraction in the PL films and a polymorphic transformation of the corresponding fatty acids were observed by differential scanning calorimetry (DSC) and verified by an analysis of the microstructure by scanning electron microscopy (SEM). The flour films showed no separation of the lipid fraction, evidence that the lipids were strongly associated with the proteins and homogenously distributed throughout the starch network, contributing to the good mechanical properties when compared to the PL films and to the excellent barrier properties when compared to both the PL and P films. The protein-protein interactions also contributed to the mechanical properties of the flour films. The presence of proteins and lipids in the flour films had an important effect on film solubility, and also on the color and opacity of the films. This study showed that the flour film properties depended on the interactions formed by their polymers (starches and proteins) and by the lipid, on the distribution of these interactions within the film matrix and on the concentrations of each component in the film. PMID:17995729

Tapia-Blácido, D; Mauri, A N; Menegalli, F C; Sobral, P J A; Añón, M C

2007-06-01

104

Moduler les cotisations employeurs à l’assurance chômage : les expériences de bonus-malus aux Etats-Unis  

Microsoft Academic Search

[fre] Notre article présente les résultats des études consacrées aux effets du système américain de modulation des cotisations patronales à l'assurance-chômage (experience rating) et quelques réflexions sur le cas de la France. Aux Etats-Unis, ces cotisations dépendent du nombre des licenciements effectués par l'entreprise au cours des années les plus récentes. Nous commençons par un rappel succinct de l'évolution historique

David Margolis

2000-01-01

105

Genome-wide identification, functional analysis and expression profiling of the Aux/IAA gene family in tomato.  

PubMed

Auxin is a central hormone that exerts pleiotropic effects on plant growth including the development of roots, shoots, flowers and fruit. The perception and signaling of the plant hormone auxin rely on the cooperative action of several components, among which auxin/indole-3-acetic acid (Aux/IAA) proteins play a pivotal role. In this study, we identified and comprehensively analyzed the entire Aux/IAA gene family in tomato (Solanum lycopersicum), a reference species for Solanaceae plants, and the model plant for fleshy fruit development. Functional characterization using a dedicated single cell system revealed that tomato Aux/IAA proteins function as active repressors of auxin-dependent gene transcription, with, however, different Aux/IAA members displaying varying levels of repression. Phylogenetic analysis indicated that the Aux/IAA gene family is slightly contracted in tomato compared with Arabidopsis, with a lower representation of non-canonical proteins. Sl-IAA genes display distinctive expression pattern in different tomato organs and tissues, and some of them display differential responses to auxin and ethylene, suggesting that Aux/IAAs may play a role in linking both hormone signaling pathways. The data presented here shed more light on Sl-IAA genes and provides new leads towards the elucidation of their function during plant development and in mediating hormone cross-talk. PMID:22368074

Audran-Delalande, Corinne; Bassa, Carole; Mila, Isabelle; Regad, Farid; Zouine, Mohamed; Bouzayen, Mondher

2012-04-01

106

Relation between anomalous Hall effect and the Dzaloshisky-Moriya anisotropy in the series of (Ag1-xAux)0.9Mn0.1 alloys  

NASA Astrophysics Data System (ADS)

The influence of the Dzyaloshinsky-Moriya (DM) anisotropy on Rs??ex/M, where ?ex is the extraordinary Hall resistivity and M is the magnetization, is investigated in canonical spin glass (SG) alloys. The strength of the DM anisotropy in the alloys is changed systematically by doping the third non-magnetic impurities. The Hall resistivity ?H, the magnetization M and the resistivity ? were measured in the series of (Ag1-xAux)0.9Mn0.1 alloys with x=0, 0.007, 0.03, and 0.05. The difference between the values of zero field cooled and field cooled Rs, below the SG transition temperature, clearly increased with the amount of Au impurities. The dependence of the chirality contribution to Rs on the DM anisotropy is discussed in relation to the theoretical work for the chirality-driven anomalous Hall effect in weak coupling regime.

Yamanaka, K.; Taniguchi, T.; Yamazaki, T.; Ashitaka, N.; Morimoto, Y.; Tabata, Y.; Kawarazaki, S.

2007-03-01

107

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

108

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

109

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

110

Decommissioning of the Nuclear Licensed Facilities at the Fontenay aux Roses CEA Center  

SciTech Connect

This is a summary of the program for the decommissioning of all the CEA's facilities in Fontenay aux Roses. The particularity of this center is that it is located in a built-up area. Taking into account the particularities of the various buildings and the levels of radioactivity in them, it was possible to devise a coherent, optimized program for the CEA-FAR licensed nuclear facility decommissioning operations.

Jeanjacques, Michel; Piketty, Laurence; Mandard, Lionel; Pedron, Guy; Boissonneau, Jean Francois; Fouquereau, Alain; Pichereau, Eric; Lethuaire, Nathalie; Estivie, David; Binet, Cedric; Meden, Igor [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, BP6, 92265 Fontenay aux Roses Cedex (France)

2008-01-15

111

Auxin-responsive grape Aux/IAA9 regulates transgenic Arabidopsis plant growth.  

PubMed

We report the characterization of VvIAA9, an auxin/indole-3-acetic acid (Aux/IAA) protein, in grapevine (Vitis vinifera L.). VvIAA9 was expressed abundantly in leaves and berries. VvIAA9 transcription was drastically upregulated from anthesis to onset of ripening (termed véraison), in which berry diameter rapidly increased. Treatment with exogenous IAA induced VvIAA9 expression in grape leaves, suggesting that VvIAA9 is an auxin-responsive Aux/IAA protein. The overexpression of VvIAA9 in Arabidopsis thaliana promoted plant growth, including rapid floral transition. However, no morphological differences were observed between the control plant and the VvIAA9-overexpressing plant. The overexpression of VvIAA9 in Arabidopsis plants rendered the plants hyposensitive to exogenous IAA. The exogenous IAA treatment did not induce VvIAA9-overexpressing Arabidopsis plant growth and expression of IAA-responsive HAT2. Taken together, we conclude that grape Aux/IAA9 protein is likely to play a crucial role as a plant growth regulator. PMID:22535320

Fujita, Keiko; Horiuchi, Haruka; Takato, Haruka; Kohno, Minako; Suzuki, Shunji

2012-07-01

112

Electronic and geometric structure of AuxCuy clusters studied by density functional theory  

NASA Astrophysics Data System (ADS)

We have determined the stable structures of AuCun, Au2Cun, Au3Cun and AuxCu8-x clusters. It has been observed that AuCun, Au2Cun and Au3Cun systems have two-dimensional (2D) structures up to six atoms and they become three-dimensional (3D) afterwards. AuxCu8-x clusters favor 3D structures till the Au7Cu1 cluster. We have found a lowest energy isomer of Au6Cu2 from the literature. Bond lengths, binding energies, density of states (DOS), highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gaps, ionization potential (IP) and electron affinity (EA) have been calculated for these structures using the first principles density functional theory (DFT) within the generalized gradient approximation (GGA) and the local density approximation (LDA). Generally, we have observed the overlap between s electrons of Cu and p electrons of Au near the Fermi level. Charge transfers are calculated by using the Löwdin analysis. It is observed that one Cu atom does not significantly modify the clusters which have more gold atoms. It is also seen that these clusters generally have nonmagnetic properties and results are consistent with the hybridization between s and d orbitals of Au in AuxCu8-x clusters.

Kadioglu, Y.; Üzengi Aktürk, O.; Tomak, M.

2014-01-01

113

L'Earned Income Tax Credit, un crédit d'impôt ciblé sur les foyers de salariés modestes aux États-Unis  

Microsoft Academic Search

[fre] L’Earned Income Tax Credit (EITC) est un crédit d’impôt bénéficiant aux foyers dans lesquels au moins une personne travaille. Les hausses de barème au cours de la décennie 90 en ont fait un mécanisme substantiel de soutien aux revenus des familles aux États-Unis. En 1998, ce mécanisme concerne 19,5 millions de foyers, pour un coût d’environ 30 milliards de

Olivier Bontout

2000-01-01

114

Contribution of streetscape audits to explanation of physical activity in four age groups based on the Microscale Audit of Pedestrian Streetscapes (MAPS).  

PubMed

Ecological models of physical activity emphasize the effects of environmental influences. "Microscale" streetscape features that may affect pedestrian experience have received less research attention than macroscale walkability (e.g., residential density). The Microscale Audit of Pedestrian Streetscapes (MAPS) measures street design, transit stops, sidewalk qualities, street crossing amenities, and features impacting aesthetics. The present study examined associations of microscale attributes with multiple physical activity (PA) measures across four age groups. Areas in the San Diego, Seattle, and the Baltimore metropolitan areas, USA, were selected that varied on macro-level walkability and neighborhood income. Participants (n = 3677) represented four age groups (children, adolescents, adults, older adults). MAPS audits were conducted along a 0.25 mile route along the street network from participant residences toward the nearest non-residential destination. MAPS data were collected in 2009-2010. Subscale and overall summary scores were created. Walking/biking for transportation and leisure/neighborhood PA were measured with age-appropriate surveys. Objective PA was measured with accelerometers. Mixed linear regression analyses were adjusted for macro-level walkability. Across all age groups 51.2%, 22.1%, and 15.7% of all MAPS scores were significantly associated with walking/biking for transport, leisure/neighborhood PA, and objectively-measured PA, respectively. Supporting the ecological model principle of behavioral specificity, destinations and land use, streetscape, street segment, and intersection variables were more related to transport walking/biking, while aesthetic variables were related to leisure/neighborhood PA. The overall score was related to objective PA in children and older adults. Present findings provide strong evidence that microscale environment attributes are related to PA across the lifespan. Improving microscale features may be a feasible approach to creating activity-friendly environments. PMID:24983701

Cain, Kelli L; Millstein, Rachel A; Sallis, James F; Conway, Terry L; Gavand, Kavita A; Frank, Lawrence D; Saelens, Brian E; Geremia, Carrie M; Chapman, James; Adams, Marc A; Glanz, Karen; King, Abby C

2014-09-01

115

Vaincre la r?ticence ? l'instauration d'un nouveau sch?ma ? base d'enfuvirtide gr?ce aux soins aux patients et aux mesures de soutien  

PubMed Central

Les patients peuvent être réticents à l’idée de commencer un traitement par l’enfuvirtide en raison de préoccupations relatives à l’auto-injection et à d’autres questions connexes. Étant donné que l’introduction d’une nouvelle classe de médicaments peut améliorer considérablement l’efficacité d’un schéma antirétroviral, appuyer le patient dans l’instauration de l’enfuvirtide, un agent sûr et efficace appartenant à une nouvelle classe, offre des bienfaits thérapeutiques. Dans le cas du présent patient, qui affichait une résistance aux trois grandes classes d’antirétroviraux, l’enfuvirtide a été ajouté avec succès au traitement grâce à un groupe d’aide par les pairs et à une assistance clinique. L’acceptation du patient a augmenté grâce à l’utilisation d’un système d’injection sans aiguilles (Biojector), avec des effets secondaires minimes et une amélioration significative du contrôle virologique et immunologique.

Trottier, Benoit

2007-01-01

116

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 4 mg 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 31-37 min). We found that HEP amplitudes were higher during open than during closed eyes between 1 and 17 min 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

2013-11-01

117

Climate Change 2013: The Physical Science Basis. An overview of the Working Group 1 contribution to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC).  

NASA Astrophysics Data System (ADS)

The Working Group 1 contribution to the IPCC Fifth Assessment Report (AR5) extends from observations and paleoclimate information regarding past changes in the climate system, a comprehensive evaluation of climate models, the detection and attribution of observed changes to natural or anthropogenic forcing, through to projected future changes on both near-term and long-term time scales. Human influence on the climate system is now detected with increased certainty, both globally and in most regions. Since the mid-20th century, the increase in anthropogenic greenhouse gas concentrations has led to surface warming over almost the entire globe, while at the same time, the ocean has continued to warm and store energy. Satellite based observations reveal with improved precision that summer sea ice extent is declining rapidly in the Arctic, glaciers are retreating world-wide, and global mean sea level continues to rise. Concurrent with a continued increase in atmospheric CO2 concentrations, the oceanic uptake of CO2 has resulted in decreasing pH of seawater since the beginning of the industrial era. Projections of future changes in the climate system to the end of the 21st century are based on a series of new climate models and new scenarios, but are broadly consistent with previous assessment findings, confirming widespread and significant changes across the climate system. Greater warming is projected to occur over land than ocean, with the most rapid warming in the Arctic region. Based on modeled changes in seasonal mean precipitation, the contrast between wet and dry regions, and wet and dry seasons is projected to increase as global temperatures rise. Confidence in projections of global mean sea level rise has increased since the previous IPCC assessment report, and projections now include future rapid ice-sheet dynamical changes. On long time scales, warming is dominated by total emissions of CO2, and many changes will persist for centuries even if CO2 emissions were stopped. In 2014, the Fifth Assessment cycle of the IPCC will be completed following the release of the reports of Working Groups II (impacts, adaptation and vulnerability) and Working Groups III (mitigation of climate change), and finally the Synthesis Report, the combined synthesis product based on all three underlying Working Group assessment reports.

Allen, Simon K.; Plattner, Gian-Kasper; Nauels, Alexander; Xia, Yu; Stocker, Thomas F.

2014-05-01

118

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

NASA Astrophysics Data System (ADS)

When a time-dependent perturbation acts on a quantum system that is initially in the nondegenerate ground state |0> of an unperturbed Hamiltonian H0, the wave function acquires excited-state components |k> with coefficients ck(t) exp(-iEkt/?), where Ek denotes the energy of the unperturbed state |k>. It is well known that each coefficient ck(t) separates into an adiabatic term ak(t) that reflects the adjustment of the ground state to the perturbation - without actual transitions - and a nonadiabatic term bk(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 Schrödinger 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 ck(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 |bk(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.

Mandal, Anirban; Hunt, Katharine L. C.

2012-10-01

119

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

120

The "Vsoil Platform" : a tool to integrate the various physical, chemical and biological processes contributing to the soil functioning at the local scale.  

NASA Astrophysics Data System (ADS)

Models describing the soil functioning are valuable tools for addressing challenging issues related to agricultural production, soil protection or biogeochemical cycles. Coupling models that address different scientific fields is actually required in order to develop numerical tools able to simulate the complex interactions and feed-backs occurring within a soil profile in interaction with climate and human activities. We present here a component-based modelling platform named "VSoil", that aims at designing, developing, implementing and coupling numerical representation of biogeochemical and physical processes in soil, from the aggregate to the profile scales. The platform consists of four softwares, i) Vsoil_Processes dedicated to the conceptual description of processes and of their inputs and outputs, ii) Vsoil_Modules devoted to the development of numerical representation of elementary processes as modules, iii) Vsoil_Models which permits the coupling of modules to create models, iv) Vsoil_Player for the run of the model and the primary analysis of results. The platform is designed to be a collaborative tool, helping scientists to share not only their models, but also the scientific knowledge on which the models are built. The platform is based on the idea that processes of any kind can be described and characterized by their inputs (state variables required) and their outputs. The links between the processes are automatically detected by the platform softwares. For any process, several numerical representations (modules) can be developed and made available to platform users. When developing modules, the platform takes care of many aspects of the development task so that the user can focus on numerical calculations. Fortran2008 and C++ are the supported languages and existing codes can be easily incorporated into platform modules. Building a model from available modules simply requires selecting the processes being accounted for and for each process a module. During this task, the platform displays available modules and checks the compatibility between the modules. The model (main program) is automatically created when compatible modules have been selected for all the processes. A GUI is automatically generated to help the user providing parameters and initial situations. Numerical results can be immediately visualized, archived and exported. The platform also provides facilities to carry out sensitivity analysis. Parameters estimation and links with databases are being developed. The platform can be freely downloaded from the web site (http://www.inra.fr/sol_virtuel/) with a set of processes, variables, modules and models. However, it is designed so that any user can add its own components. Theses adds-on can be shared with co-workers by means of an export/import mechanism using the e-mail. The adds-on can also be made available to the whole community of platform users when developers asked for. A filtering tool is available to explore the content of the platform (processes, variables, modules, models).

Lafolie, François; Cousin, Isabelle; Mollier, Alain; Pot, Valérie; Moitrier, Nicolas; Balesdent, Jérome; bruckler, Laurent; Moitrier, Nathalie; Nouguier, Cédric; Richard, Guy

2014-05-01

121

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

122

Identification and expression analysis of primary auxin-responsive Aux/IAA gene family in cucumber (Cucumis sativus).  

PubMed

Aux/IAA is an important gene family involved in many aspects of growth and development. Aux/IAA proteins are short-lived nuclear proteins that are induced primarily by various phytohormones. In this study, 29 Aux/IAA family genes (CsIAA01-CsIAA29) were identified and characterized in cucumber, including gene structures, phylogenetic relationships, conserved protein motifs and chromosomal locations. These genes show distinct organizational patterns of their putative motifs. The distributions of the genes vary: except for five CsIAA genes in cucumber that were not located, seven CsIAA genes were found on scaffold, while the other 17 CsIAA genes were distributed on seven other chromosomes. Based on a phylogenetic analysis of the Aux/IAA protein sequences from cucumber, Arabidopsis and other plants, the Aux/IAA genes in cucumber were categorized into seven subfamilies. To investigate whether the expression of CsIAA genes is associated with auxin induction, their transcript levels were monitored in seedlings treated with IAA (indole-3-acetic acid), and their expression patterns were analysed by semiquantitative reverse transcription-polymerase chain reaction (RT-PCR). The results showed that 11/29 CsIAA genes were expressed in leaves whether treated with IAA or not and the time course of processing and compared with the control, five CsIAA genes showed low expression only after 60 min treatment with IAA, while 11 genes showed no expression. These results provide useful information for further functional analysis of Aux/IAA gene family in cucumber. PMID:24371172

Gan, Defang; Zhuang, Dan; Ding, Fei; Yu, Zhenzhou; Zhao, Yang

2013-12-01

123

AUX1 Promotes Lateral Root Formation by Facilitating Indole-3-Acetic Acid Distribution between Sink and Source Tissues in the Arabidopsis Seedling  

PubMed Central

Arabidopsis root architecture is regulated by shoot-derived signals such as nitrate and auxin. We report that mutations in the putative auxin influx carrier AUX1 modify root architecture as a result of the disruption in hormone transport between indole-3-acetic acid (IAA) source and sink tissues. Gas chromatography–selected reaction monitoring–mass spectrometry measurements revealed that the aux1 mutant exhibited altered IAA distribution in young leaf and root tissues, the major IAA source and sink organs, respectively, in the developing seedling. Expression studies using the auxin-inducible reporter IAA2::uidA revealed that AUX1 facilitates IAA loading into the leaf vascular transport system. AUX1 also facilitates IAA unloading in the primary root apex and developing lateral root primordium. Exogenous application of the synthetic auxin 1-naphthylacetic acid is able to rescue the aux1 lateral root phenotype, implying that root auxin levels are suboptimal for lateral root primordium initiation in the mutant.

Marchant, Alan; Bhalerao, Rishikesh; Casimiro, Ilda; Eklof, Jan; Casero, Pedro J.; Bennett, Malcolm; Sandberg, Goran

2002-01-01

124

The AUX1 LAX family of auxin influx carriers is required for the establishment of embryonic root cell organization in Arabidopsis thaliana  

PubMed Central

Background and Aims The root meristem of the Arabidopsis thaliana mature embryo is a highly organized structure in which individual cell shape and size must be regulated in co-ordination with the surrounding cells. The objective of this study was to determine the role of the AUX1 LAX family of auxin import carriers during the establishment of the embryonic root cell pattern. Methods The radicle apex of single and multiple aux1 lax mutant mature embryos was used to evaluate the effect of this gene family upon embryonic root organization and root cap size, cell number and cell size. Key Results It was demonstrated here that mutations within the AUX1 LAX family are associated with changes in cell pattern establishment in the embryonic quiescent centre and columella. aux1 lax mutants have a larger radicle root cap than the wild type and this is associated with a significant increase in the root-cap cell number, average cell size, or both. Extreme disorganization of the radicle apex was observed among quadruple aux1 lax1 lax2 lax3 mutant embryos, but not in single aux1 null or in lax1, lax2 and lax3 single mutants, indicating redundancy within the AUX1 LAX family. Conclusions It was determined that the AUX1 LAX family of auxin influx facilitators participates in the establishment of cell pattern within the apex of the embryonic root in a gene-redundant fashion. It was demonstrated that aux1 lax mutants are affected in cell proliferation and cell growth within the radicle tip. Thus AUX1 LAX auxin importers emerge as new players in morphogenetic processes involved in patterning during embryonic root formation.

Ugartechea-Chirino, Yamel; Swarup, Ranjan; Swarup, Kamal; Peret, Benjamin; Whitworth, Morag; Bennett, Malcolm; Bougourd, Sue

2010-01-01

125

Exposition pr?coce aux aliments et allergies alimentaires chez les enfants  

PubMed Central

Résumé Question J’étais sous l’impression qu’on devrait éviter de donner aux nourrissons des aliments potentiellement allergènes comme des noix, du lait de vache et des œufs pour prévenir le développement de réactions allergiques. Quels conseils devrait-on donner aux parents concernant l’introduction des aliments durant la petite enfance et le développement des allergies alimentaires? Réponse Il n’y a pas de données probantes indiquant que retarder l’introduction d’aliments particuliers après l’âge de 6 mois aide à prévenir les allergies. Une récente déclaration de la Société canadienne de pédiatrie ne recommande aucun délai quant à l’introduction d’aliments durant la petite enfance. De récentes études de recherche semblent aussi faire valoir que l’introduction précoce (entre 4 et 6 mois) d’aliments possiblement allergènes procure une forme de protection et contribue à prévenir les allergies, mais il faudrait plus de recherche à ce sujet.

Chin, Benetta; Chan, Edmond S.; Goldman, Ran D.

2014-01-01

126

Auxin-nonresponsive grape Aux/IAA19 is a positive regulator of plant growth.  

PubMed

We report the characterization of VvIAA19, an auxin/indole-3-acetic acid (Aux/IAA) protein, in grapevine (Vitis vinifera L.). VvIAA19 was expressed abundantly in berries. VvIAA19 transcription was rapidly increased at pre-anthesis and then decreased during fruit set. Before véraison, however, VvIAA19 gene expression was upregulated again and maximum expression was maintained until the end of ripening. Exogenous IAA did not induce VvIAA19 expression in grape leaves, suggesting that VvIAA19 might be auxin-nonresponsive. The overexpression of VvIAA19 in Arabidopsis thaliana had a notable effect on plant growth. Although no morphological changes were observed, transgenic Arabidopsis plants overexpressing VvIAA19 exhibited faster growth, including root elongation and floral transition, than the control plant, suggesting that the constitutive expression of VvIAA19 protein resulted in increased growth rates without any detectable harm. Taken together, we conclude that grape Aux/IAA19 protein is likely to play a crucial role as a plant growth regulator. PMID:21562765

Kohno, Minako; Takato, Haruka; Horiuchi, Haruka; Fujita, Keiko; Suzuki, Shunji

2012-02-01

127

Improvement in High School physics Teaching will Increase Physics Enrollment  

Microsoft Academic Search

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.

Samina Masood

2008-01-01

128

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

129

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

130

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

131

Efficacité d'un programme d'entraînement aux habiletés sociales pour enfants présentant des diagnostics psychiatriques hétérogènes  

Microsoft Academic Search

Le but de cette étude était d'évaluer les effets d'un programme d'entraînement aux habiletés sociales conçu pour des enfants de 9 à 14 ans présentant des problèmes de santé mentale et des difficultés relationnelles. Le programme (offert en clinique externe) combine des techniques de l'apprentissage social et de l'approche cognitivo-comportementale. Les participants (N = 51; âge moyen = 10,8 ans;

Lyse Lessard; Sylvain Coutu

2011-01-01

132

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

2013-01-01

133

Topotaxial fabrication of vertical Aux Ag1-x nanowire arrays: plasmon-active in the blue region and corrosion resistant.  

PubMed

Topotaxial growth of Au(x) Ag(1-x) alloy nanowires (NWs) by postepitaxial deposition of Ag vapor on Au NWs and investigation of their plasmonic properties are reported. Ag vapor is supplied onto the epitaxially grown Au NWs, topotaxially turning them into Au(x) Ag(1-x) alloy NWs. The original geometries and alignments of the Au nanostructures are well preserved, while the composition of the alloy NWs is controlled by varying the Ag vapor supply time. The Au(0.5) Ag(0.5) NWs show high surface-enhanced Raman scattering (SERS) activity comparable to that of Ag NWs as well as highly increased oxidation resistance. The plasmon-active wavelength range of the Au(0.5) Ag(0.5) NW is significantly extended to the blue region compared to Au NWs. The Au(x) Ag(1-x) alloy NWs that have plasmonic activity in the blue region in addition to high corrosion resistance will make a superb material for practical plasmonic devices including SERS sensors and optical nanoantennas. PMID:22431295

Lee, Hyoban; Yoo, Youngdong; Kang, Taejoon; In, Juneho; Seo, Min-Kyo; Kim, Bongsoo

2012-05-21

134

Élaboration de couches minces de carbone par ablation laser femtoseconde pour application aux biomatériaux implantables  

NASA Astrophysics Data System (ADS)

Des films de tetrahedral amorphous-Carbon (ta-C) ont été déposés, sous vide poussé, par ablation d'une cible de graphite avec un laser Ti : saphir (durée d'impulsion 170 fs, fréquence de répétition 1 kHz, énergie maximale par impulsion 1,5 mJ, longueur d'onde 800 nm) sur substrats standard et sur biomatériaux (acier AISI 316L, polyéthylène à très haut poids moléculaire). Les propriétés de ces couches (structure, propriétés nanomécaniques et tribologiques) ont été caractérisées, en fonction des conditions d'élaboration, en examinant l'intérêt de l'utilisation d'un laser femtoseconde et leur capacité à satisfaire aux exigences spécifiques du domaine biomédical. Les propriétés d'adhérence des films ont été considérablement améliorées lors du dépôt sur des substrats en acier inoxydable préalablement préparés par décapage ionique in situ sous atmosphère d'argon. La surface hémisphérique d'une tête fémorale, en acier inoxydable, de prothèse de hanche de diamètre 22,2 mm a été revêtue d'un film de DLC adhérent et homogène en épaisseur. La résistance à l'usure de ce revêtement sera quantifiée à l'aide d'un simulateur de marche durant un million de cycles (correspondant à une année d'activité physique d'un être humain).

Loir, A.-S.; Garrelie, F.; Donnet, C.; Subtil, J.-L.; Belin, M.; Forest, B.; Rogemond, F.; Laporte, P.

2005-06-01

135

Xe{sup +} formation following photolysis of Au-Xe: A velocity map imaging study  

SciTech Connect

The photodissociation dynamics of Au-Xe leading to Xe{sup +} formation via the {Xi}{sub 1/2}-X{sup 2}{Sigma}{sup +} (v{sup '}, 0) band system (41 500-41 800 cm{sup -1}) have been investigated by velocity map imaging. Five product channels have been indentified, which can be assigned to photoinduced charge transfer followed by photodissociation in either the neutral or the [Au-Xe]{sup +} species. For the neutral species, charge transfer occurs via a superexcited Rydberg state prior to dissociative ionization, while single-photon excitation of the gold atom in Au{sup +}-Xe accesses an (Au{sup +})*-Xe excited state that couples to a dissociative continuum in Au-Xe{sup +}. Mechanisms by which charge transfer occurs are proposed, and branching ratios for Xe{sup +} formation via the superexcited Rydberg state are reported. The bond dissociation energy for the first excited state of Au{sup +}-Xe is determined to be {approx}9720 {+-} 110 cm{sup -1}.

Hopkins, W. Scott; Woodham, Alex P.; Mackenzie, Stuart R. [Department of Chemistry, University of Oxford, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ (United Kingdom); Plowright, Richard J.; Wright, Timothy G. [School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD (United Kingdom)

2011-03-07

136

Time perspectives on glacial landscape formation - glacial flow chronology at Lac aux Goélands, northeastern Québec, Canada  

NASA Astrophysics Data System (ADS)

We used mapping from aerial photographs and field investigations around Lac Aux Goélands (Whitegull Lake), northeastern Québec, to establish a glacial flow chronology that involves three different glacial landform systems. We interpret the youngest of these systems as related to the late Wisconsinan deglaciation. This system has an up-glacier discontinuity that marks a temporal shift from warm-based subglacial conditions to non-erosive cold-based subglacial conditions, whereby older glacial landscapes are preserved in the interior of Québec-Labrador. Furthermore, our results support theories suggesting a northward migrating ice divide to a final position south of Ungava Bay during the final deglaciation. The recognition that a glacial landscape is fragmented and consists of smaller, temporally unrelated units is of considerable significance in understanding ice-sheet dynamics and patterns of subglacial preservation and destruction. This is because a fragmented landscape implies a fragmented formation history, where formation of subglacial landforms occurred in restricted subglacial zones during restricted time periods. Periods of formation must have been separated by periods of preservation and inhibited subglacial reshaping. Based on estimates of the ice margin retreat velocity and the velocity of the warm-based inward migrating zone, we suggest that periods of preservation were orders of magnitude longer than periods of subglacial landform formation.

Clarhäll, Anders; Jansson, Krister N.

2003-07-01

137

Phloem-mobile Aux/IAA transcripts target to the root tip and modify root architecture.  

PubMed

In plants, the phloem is the component of the vascular system that delivers nutrients and transmits signals from mature leaves to developing sink tissues. Recent studies have identified proteins, mRNA, and small RNA within the phloem sap of several plant species. It is now of considerable interest to elucidate the biological functions of these potential long-distance signal agents, to further our understanding of how plants coordinate their developmental programs at the whole-plant level. In this study, we developed a strategy for the functional analysis of phloem-mobile mRNA by focusing on IAA transcripts, whose mobility has previously been reported in melon (Cucumis melo cv. Hale's Best Jumbo). Indoleacetic acid (IAA) proteins are key transcriptional regulators of auxin signaling, and are involved in a broad range of developmental processes including root development. We used a combination of vasculature-enriched sampling and hetero-grafting techniques to identify IAA18 and IAA28 as phloem-mobile transcripts in the model plant Arabidopsis thaliana. Micro-grafting experiments were used to confirm that these IAA transcripts, which are generated in vascular tissues of mature leaves, are then transported into the root system where they negatively regulate lateral root formation. Based on these findings, we present a model in which auxin distribution, in combination with phloem-mobile Aux/IAA transcripts, can determine the sites of auxin action. PMID:22925478

Notaguchi, Michitaka; Wolf, Shmuel; Lucas, William J

2012-10-01

138

Physical activity - preventive medicine (image)  

MedlinePLUS

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

139

Contributions to environmental mechanics: Introduction  

NASA Astrophysics Data System (ADS)

In the second half of the 20th century, environmental mechanics developed from a collection of loosely connected principles and techniques t o a coherent quantitative treatment of flow and transport in the soil-plant-atmosphere continuum. John Philip was in many respects the life and soul of this adventure . He contributed foremost to the physics of water in unsaturated soils, but also to micrometeorology and physical ecology. In this introductory chapter we briefly review how his contributions influenced and are related to the activities of his colleagues and provide an overview of the present status of theory of soil water movement. We also indicate how the various contributions to this volume fit in this context. We start with a discussion of the nature, foundation, and application of the Richards equation, with emphasis on the dominant role of John Philip in finding analytical solutions of this equation. This is followed by a discussion of various developments beyond the Richards equation: multiphase flow, simultaneous transport of water and heat, flow of water in soils subject to swelling-shrinkage, transport of solutes in unsaturated soils, and flow and transport processes at various scales in space and time. The varied contributions of John Philip to micrometeorology and physical ecology are also reviewed briefly. In the concluding section, some challenges for environmental mechanics are indicated.

Raats, Peter A. C.; Smiles, David E.; Warrick, Arthur W.

140

Tectonic conditions of hydrothermal polymetallic vein-type mineralization, Sainte Marie-aux-Mines, France  

NASA Astrophysics Data System (ADS)

The Sainte-Marie-aux-Mines (SMM) mines host one of the most famous and oldest silver deposits in Europe. The SMM district is located in the central part of the Vosges mountains, France, within gneiss and granites of the Moldanubian zone. The SMM district includes the Neuenberg E-W vein-type Cu-Ag-As/Pb-Zn deposit and the Altenberg N-S vein-type Pb-Zn-Ag deposit. Deposition of the SMM hydrothermal mineralization occurred under a brittle tectonic regime that might be connected to neo-Variscan and/or post-Variscan tectonics, in a similar way as the polymetallic vein deposits of the Black Forest, Germany. A structural study was done in the Neuenberg area, in the vicinity of the Saint-Jacques vein, and within the Gabe Gottes mine, considering the orientation, extent, chronology and density of faults as well as the nature of the infilling minerals. In the Gabe-Gottes mine, the Saint-Jacques vein comprises multiple successive, sub-parallel subvertical veinlets with gangue minerals, mostly carbonates and quartz, and metal-bearing phases, sulfides and sulfosalts. The veinlets are 2 to 50 cm thick and strike N80° to N110°, the earlier veins slightly dipping towards the north, and the latest one, to the south. Seven systems of faults were identified, which may be classified into three major groups formed respectively before, during and after the main stage of ore deposition: a) Pre-mineralization faults - These consist of sinistral NE-SW strike-slip faults, and NW-SE and NE-SW steeply dipping normal faults. These could be related to Carboniferous events considering their relationships with the granitoid intrusives present in the mine area (Brézouard leucogranite ~329 Ma), and the extensional tectonics developed during exhumation processes. b) Faults associated with the main ore-deposition - These faults could be related to late-Hercynian processes from compressional to extensional tectonic regimes. Mineralization controlling faults consist of dextral and sinistral E-W strike-slip faults. Early strike-slip movements are assessed by the presence of striated iron oxides, the crystallization of which is considered to be early during the ore deposition process. Mineralizing fluids were probably fluorine-rich as F-bearing minerals, sericite, chlorite and apatite are present in the chlorite zone associated with early sulphide-rich ores. The E-W mineralized faults are only easily compatible with the tectonics known in Permian times. c) Late-stage faults - These could be related to the numerous changes in plate configuration which occur during the Mesozoic and Cenozoic times, in accordance with the creation of the Paris basin, the opening of Atlantic ocean and Rhine Graben, as well as with the Tethys closure. For example, the vertical lineation superposed on an horizontal lineation observed on mineralized rocks indicate reactivation of the former E-W mineralized veins under a normal movement. The latter may correspond to an extensive regime known during Oligocene times. On the other hand, one of the major late-stage faults strikes N-S and is related to a dextral strike-slip system, which could be considered as Miocene. It is expected that fluid remobilization occurred during fault reactivation, a process which could have led to successive ore deposition following the emplacement of the major E-W mineralized veins. A fluid inclusion study in the gangue minerals of the Gabe Gottes is now under investigation. This together with isotopic studies will help to determine the source of the mineralizing fluids, as well as the conditions of ore deposition. Keywords: Faults, polymetallic mineralization, variscan orogeny, Gabe-Gottes, Sainte-Marie-aux-Mines, Vosges, F-rich fluids.

Hafeznia, Y.; Bourlange, S.; Ohnenstetter, M.

2012-04-01

141

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

142

La racialisation de la sante publique aux Etats-Unis : entre pouvoir sur la vie et droit de laisser mourir.  

PubMed

RSUM Aux États-Unis, une intensification de l'usage de la race en santé publique a récemment été notée ; une idée qui est pourtant controversée dans les sciences. La race a été vue dans ce contexte comme un objet de discours entre pouvoirs et savoirs, un objet qui se réfère au corps devenu au cours des derniers siècles un site discursif pour représenter la différence. Cet article s'appuie sur une analyse de documents de la santé publique parus aux États-Unis et issus de bureaux fédéraux et d'une importante revue spécialisée dans le domaine sanitaire, qui ont été publiés entre 2001 et 2009. Cette étude a analysé la manière dont la race est représentée, produite comme objet de connaissance et régulée par les pratiques discursives dans ces documents. Les résultats décrivent deux processus enchevêtrés, la racialisation et la sanitarisation, qui concourent à reformuler l'idée de race. Le premier est un ensemble d'opérations qui visent à identifier, à situer et à opposer les sujets et les groupes à partir de labels standardisés. La sanitarisation assure la traduction des groupes racialisés en termes de maladies, de comportements, de vie ou de mort. Ces pratiques aboutissent à la caractérisation et à la formation d'objets racialisés et sanitarisés et à des stéréotypes ; un ensemble d'opérations qui a tendance à naturaliser la différence. La racialisation apparaît également tiraillée entre un pouvoir sur la vie et un droit de laisser mourir. Enfin, cette étude propose aux acteurs de la santé publique de sortir des frontières imposées par le discours racialisant. PMID:24801319

Cloos, Patrick

2012-03-01

143

Top Quark Physics  

Microsoft Academic Search

In this contribution I review the physics of top quarks at a future Linear Collider. Main emphasis is put on the process e+ e- --> t bar t close to threshold. Different physical observables, their sensitivity to the basic parameters and their theoretical prediction are discussed. Recent higher order calculations are shown to have a considerable impact on a precise

Thomas Teubner

1999-01-01

144

Genome-wide analysis of Aux/IAA gene family in Solanaceae species using tomato as a model.  

PubMed

Auxin plays key roles in a wide variety of plant activities, including embryo development, leaf formation, phototropism, fruit development and root initiation and development. Auxin/indoleacetic acid (Aux/IAA) genes, encoding short-lived nuclear proteins, are key regulators in the auxin transduction pathway. But how they work is still unknown. In order to conduct a systematic analysis of this gene family in Solanaceae species, a genome-wide search for the homologues of auxin response genes was carried out. Here, 26 and 27 non redundant AUX/IAAs were identified in tomato and potato, respectively. Using tomato as a model, a comprehensive overview of SlIAA gene family is presented, including the gene structures, phylogeny, chromosome locations, conserved motifs and cis-elements in promoter sequences. A phylogenetic tree generated from alignments of the predicted protein sequences of 31 OsIAAs, 29 AtIAAs, 31 ZmIAAs, and 26 SlIAAs revealed that these IAAs were clustered into three major groups and ten subgroups. Among them, seven subgroups were present in both monocot and dicot species, which indicated that the major functional diversification within the IAA family predated the monocot/dicot divergence. In contrast, group C and some other subgroups seemed to be species-specific. Quantitative real-time PCR (qRT-PCR) analysis showed that 19 of the 26 SlIAA genes could be detected in all tomato organs/tissues, however, seven of them were specifically expressed in some of tomato tissues. The transcript abundance of 17 SlIAA genes were increased within a few hours when the seedlings were treated with exogenous IAA. However, those of other six SlIAAs were decreased. The results of stress treatments showed that most SIIAA family genes responded to at least one of the three stress treatments, however, they exhibited diverse expression levels under different abiotic stress conditions in tomato seedlings. SlIAA20, SlIAA21 and SlIAA22 were not significantly influenced by stress treatments even though at least one stress-related cis-element was identified in their promoter regions. In conclusion, our comparative analysis provides an insight into the evolution and expression patterns in various tissues and in response to auxin or stresses of the Aux/IAA family members in tomato, which will provide a very useful reference for cloning and functional analysis of each member of AUX/IAA gene family in Solanaceae crops. PMID:22314799

Wu, Jian; Peng, Zhen; Liu, Songyu; He, Yanjun; Cheng, Lin; Kong, Fuling; Wang, Jie; Lu, Gang

2012-04-01

145

Croissance Par Epitaxie EN Phase Vapeur aux Organo - et Caracterisation des Heterostructures Contraintes a Base de Phosphur de Indium  

Microsoft Academic Search

Trois systemes heteroepitaxiaux a base de InP:InP\\/Si, InAs\\/InP et InAsP\\/InP ont ete fabriques par epitaxie en phase vapeur aux organo-metalliques (EPVOM)conventionelle. En plus l'epitaxie par couches atomiques (ECA) a ete utilisee pour fabriquer des puits quantiques ultra-minces et des superreseaux a courte periode InAs\\/InP. L'epitaxie de InP sur le silicium pose des problemes lies a un desaccord de maille de

Chuong Anh Tran

1994-01-01

146

75 Years of Physics at NBS  

ERIC Educational Resources Information Center

This historical survey describes the contributions made to the field of physics by the National Bureau of Standards since its inception in 1901. Four broad areas are emphasized: nuclear physics, thermal physics (including cryogenics), spectroscopy and fundamental constants. (BT)

Ambler, Ernest

1976-01-01

147

Physics Central: Fiddle Physics  

NSDL National Science Digital Library

This PhysicsCentral article describes the physics behind violins. The article discusses the mechanics of violin construction and how violinists produce sound. It includes labeled pictures of violin parts, animations of how the violin bow works, and other helpful images.

Popkin, Gabriel

2009-11-16

148

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 water…

Maron, Marta Katarzyna

2011-01-01

149

Cinetique de la nucleation binaire non-isotherme et de la condensation binaire aux conditions dynamiques  

NASA Astrophysics Data System (ADS)

La présente thèse est consacrée à la théorie de la condensation binaire. Premièrement, nous considérons la thermodynamique de la nucléation binaire, en nous concentrant sur l'énergie libre de formation d'une goutte et la distribution d'équilibre des gouttes, qui est essentielle pour la vitesse théorique de nucléation et dont le choix n'est toutefois pas unique. Une nouvelle distribution d'équilibre est proposée. Deuxièmement, nous développons la théorie cinétique de la nucléation binaire non-isotherme. Cette théorie traite de l'influence des effets thermiques sur la condensation binaire qui sont causés par la chaleur de condensation. Les molécules du mélange de vapeurs absorbées par une goutte de solution binaire lui transmettent de la chaleur de condensation, tandis que les molécules émises par la goutte lui enlèvent une telle chaleur. La température moyenne de la goutte s'accroît au fur et à mesure qu'elle grandit. Cet échauffement des gouttes croissantes diminue la vitesse de nucléation et influence d'autres caractéristiques du processus. Dans le cas où les chaleurs de condensation sont très petites par rapport à la fluctuation efficace de l'énergie d'une goutte l'équation cinétique peut être réduite à celle de Fokker et Planck. L'analyse de l'équation cinétique permet de déterminer la hiérarchie des échelles de temps de la nucléation binaire non-isotherme. Cela rend possible de séparer et décrire analytiquement l'étape de relaxation thermique pendant laquelle la distribution des gouttes selon la température s'approche d'une gaussienne, alors que leur distribution selon les nombres de molécules ne change guère. Finalement, nous étudions la condensation binaire isotherme aux conditions dynamiques. Dans ce cas la formation et la croissance des gouttes se passent en même temps que la métastabilité du mélange de vapeurs croît graduellement, atteint son maximum et décroît. C'est ainsi que la condensation binaire se passe le plus souvent dans la nature. Nous développons la théorie cinétique de ces processus pour les systèmes ouverts ainsi que pour les systèmes fermés (du point de vue de l'échange de matière entre le système où la condensation se passe et son environnement). Les deux sursaturations idéales que les vapeurs du mélange auraient eues en absence d'absorption de la substance par les gouttes sont déterminées par les conditions extérieures: la dépendance temporelle des sursaturations idéales est considérée comme donnée. De même, cette méthode permet de trouver la dépendance temporelle des sursaturations réelles des deux vapeurs et le nombre total de gouttes. (Abstract shortened by UMI.)

Djikaev, Yuri

150

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

151

Etude de la microstructure d'un acier 316 titane apres vieillissement et apres irradiation aux neutrons  

NASA Astrophysics Data System (ADS)

La précipitation qui se produit lors de vieillissements de longue durée entre 450 et 700°C dans un acier 316 Ti soit hypertrempé soit écroui, a été étudiée en couplant les techniques de microscopic électronique et de microanalyse X. Pour les cas expérimentaux étudiés, les résultats obtenus montrent que la composition des carbures M 23C 6 et des phases ?, Laves et ? est peu sensible aux conditions de vieillissement et dépend également peu de l'état structural initial. Leur teneur en éléments principaux de l'alliage est d'ailleurs voisine de celle des phases précipitées dans l'acier non stabilisé. Excepté les carbures de type M 6C, toutes ces phases ont une teneur en nickel inférieure à celle de la matrice. Les premiers rérultats obtenus sur des matériaux irradiés aux neutrons montrent que la précipitation sous flux est différente de celle qui se produit dans l'acier vieilli. Les phases ?' et G ainsi que les carbures riches en nickel ont été observés. L'attention a été attirée sur le fait qu'il n'y a pas de corrélation simple entre la vitesse de gonflement et la teneuer résiduelle en nickel de la matrice.

Brun, G.; Le Naour, J.; Vouillon, M.

1981-10-01

152

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

153

Physics for Physical Sciences  

NSDL National Science Digital Library

Created by Jason Dicker at Launceston College in Tasmania, these materials present information and examples of the physics concepts of radioactivity, motion, and current electricity. The Radioactivity portion contains sections on natural types of radioactivity, radioactive decay, and problems for students such as designing "a series of experiments to show that 'radioactivity' has nothing to do with sunlight" without using a Geiger counter. The Motion portion contains pages about vectors, projectile motion, momentum, and force. The final section, Current Electricity, has links to pages about charge and current, voltage, resistance, and some problems about electricity for students to solve. This is an excellent resource for physics educators in higher education to use to explain physics principles in the physical sciences.

Dicker, Jason

2008-01-30

154

Recent contributions to the calculus of finite differences: a survey  

Microsoft Academic Search

We retrace the recent history of the Umbral Calculus. After studying the classic results concerning polynomial sequences of binomial type, we generalize to a certain type of logarithmic series. Finally, we demonstrate numerous typical examples of our theory. Nous passons en revue ici les resultats recents du calcul ombral. Nous nous interessons tout d'abord aux resultats classique appliqu\\\\'es aux suites

Daniel E. Loeb; Gian-Carlo Rota

1995-01-01

155

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

156

Localized Iron Supply Triggers Lateral Root Elongation in Arabidopsis by Altering the AUX1-Mediated Auxin Distribution[C][W][OA  

PubMed Central

Root system architecture depends on nutrient availability, which shapes primary and lateral root development in a nutrient-specific manner. To better understand how nutrient signals are integrated into root developmental programs, we investigated the morphological response of Arabidopsis thaliana roots to iron (Fe). Relative to a homogeneous supply, localized Fe supply in horizontally separated agar plates doubled lateral root length without having a differential effect on lateral root number. In the Fe uptake-defective mutant iron-regulated transporter1 (irt1), lateral root development was severely repressed, but a requirement for IRT1 could be circumvented by Fe application to shoots, indicating that symplastic Fe triggered the local elongation of lateral roots. The Fe-stimulated emergence of lateral root primordia and root cell elongation depended on the rootward auxin stream and was accompanied by a higher activity of the auxin reporter DR5-?-glucuronidase in lateral root apices. A crucial role of the auxin transporter AUXIN RESISTANT1 (AUX1) in Fe-triggered lateral root elongation was indicated by Fe-responsive AUX1 promoter activities in lateral root apices and by the failure of the aux1-T mutant to elongate lateral roots into Fe-enriched agar patches. We conclude that a local symplastic Fe gradient in lateral roots upregulates AUX1 to accumulate auxin in lateral root apices as a prerequisite for lateral root elongation.

Giehl, Ricardo F.H.; Lima, Joni E.; von Wiren, Nicolaus

2012-01-01

157

Les managers de proximité et les changements : quels sont les difficultés, les rôles et les comportements des Chefs de groupe face aux changements organisationnels ?  

Microsoft Academic Search

Alors que les organisations sont de plus en plus souvent confrontées à des problématiques de changements, le taux de réussite de leur mise en oeuvre reste relativement faible. De par leur positionnement particulier dans l'organisation, les managers de proximité ont une incidence forte sur la réussite ou l'échec des changements. Or, la littérature consacrée aux changements ne traite que très

Jérémy Vignal

2011-01-01

158

RAC GTPases in Tobacco and Arabidopsis Mediate Auxin-Induced Formation of Proteolytically Active Nuclear Protein Bodies That Contain AUX/IAA ProteinsW?  

PubMed Central

Auxin signaling relies on ubiquitin ligase SCFTIR1-mediated 26S proteasome-dependent proteolysis of a large family of short-lived transcription regulators, auxin/indole acetic acid (Aux/IAA), resulting in the derepression of auxin-responsive genes. We have shown previously that a subset of Rac GTPases is activated by auxin, and they in turn stimulate auxin-responsive gene expression. We show here that increasing Rac signaling activity promotes Aux/IAA degradation, whereas downregulating that activity results in the reduction of auxin-accelerated Aux/IAA proteolysis. Observations reported here reveal a novel function for these Rac GTPases as regulators for ubiquitin/26S proteasome-mediated proteolysis and further consolidate their role in auxin signaling. Moreover, our study reveals a cellular process whereby auxin induces and Rac GTPases mediate the recruitment of nucleoplasmic Aux/IAAs into proteolytically active nuclear protein bodies, into which components of the SCFTIR1, COP9 signalosome, and 26S proteasome are also recruited.

Tao, Li-zhen; Cheung, Alice Y.; Nibau, Candida; Wu, Hen-ming

2005-01-01

159

[Depression and physical illness].  

PubMed

Depression associated to a physical illness may be under-recognized or under-treated because of its diagnosis related difficulties and the trivialization of its presence in such a context. Now, this association contributes to physical illness' worsening, increased impairment, and may be responsible of care withdrawal, and even of suicide. The association between depression and physical illness may be a simple coincidence, or a psychological reaction to physical illness or else is the direct consequence of the somatic disease through biological disturbances or the iatrogenic effects of the disease treatment. It is also known, that depressive mood constitutes a significant risk factor for the development of various somatic disorders. Finally, a depression should be evoked when facing unexplained physical complaints. The entanglement between depression and physical illness needs to be particularly careful with prescriptions and especially an increased vigilance about drugs interactions. PMID:18506976

Hazen, Constance; Soudry, Yaël; Consoli, Silla M

2008-02-29

160

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

161

The French Tsunami warning center for the Mediterranean and North-East Atlantic (CENtre d'ALerte aux Tsunamis, CENALT)  

NASA Astrophysics Data System (ADS)

The CENALT (CENtre d'Alerte aux Tsunamis) is responsible for the French NTWC (National Tsunami Warning Center). This center was established through a project that was requested by the French Ministry of Interior and the Ministry of Sustainable Development. It is implemented by the Commissariat à l'énergie atomique et aux énergies alternatives (CEA), the French Hydrographic and Oceanographic Service (SHOM) and the Centre National de la Recherche Scientifique (CNRS), and is based in Bruyères-le-Châtel (30 km from Paris). This center is based on three main components: seismic network data, sea level network data, dissemination system and processing and analyzing softwares and is operating on a 24/7 basis. The CENALT has established scientific cooperation with 8 institutions and implemented and funded private leased lines to exchange data with institutions from 5 different European countries (Germany, Italy, Portugal, Spain, Tunisia). The seismic data are processed with the Seiscomp 3 software. SHOM is working on making all French tide-gauge stations operated and available in real-time in 2012, and they installed 5 new tide gage stations. The tide gage data will be processed with a customized version of the Guitar (Gempa) software allowing the detection of tsunami signals, complemented by other softwares developed by the CEA. Historical tsunami databases (sources and observations) and earthquake databases, mostly based on available international databases, have been synthetized by CEA to produce information maps in real time, used to guide operators of permanence. Precomputed tsunami scenarios are implemented to build in real time maps of the highest tsunami impact expected in deep water. Along with an optimized tsunami modeling tool, these softwares help to define the areas where the tsunami may be observed and cause damage. The CENALT has been operating since early January 2012 as a pre-operational service and will be fully operational in July 2012. It is also ready to act as Candidate Watch Provider covering Western Mediterranean by July 2012.

Schindelé, F.; Bossu, R.; Alabrune, N.; Arnoul, P.; Duperray, P.; Gailler, A.; Guilbert, J.; Hébert, H.; Hernandez, B.; Loevenbruck, A.; Roudil, P.

2012-04-01

162

Physical Changes  

NSDL National Science Digital Library

After completing this tutorial you should be able to identify a physical change as well as describe what happens to a substance that undergoes a phase change. Physical changes cause a change in the physical properties of a substance without changing what the substance actually is. Physical Change Definition What are some common physical properties? Physical Properties You\\'ve already learned about chemical properties and changes. Now test your knowledge of physical and chemical properties. Physical Properties Quiz An important physical change is a phase change. Go to ...

Jolley, Mr.

2005-10-29

163

Physics in perspective, volume 1  

NASA Technical Reports Server (NTRS)

Progress in physics and its subfields is presented and the contribution of physics is related to progress in other scientific disciplines and the manner in which these have been utilized by our civilization. The future course of endeavor in the various subfields of physics and the extent to which these will require resources of manpower, facilities, and funding are discussed. The rational responses of the total research effort in physics to alternative funding levels are assayed.

1972-01-01

164

The Physical Tourist  

Microsoft Academic Search

We provide a tour of Leipzig, one of the cultural centers of Germany that contributed a significant chapter in the history\\u000a of physics. In the nineteenth century the city and University of Leipzig were home to one of the oldest physical institutes\\u000a in Germany, and in the late 1920s the arrival of Werner Heisenberg (1901-1976), Peter Debye (1884-1966), and Friedrich

Wolfgang Schreier; Karl-Heinz Schlote

2008-01-01

165

Sports physical  

MedlinePLUS

A person gets a sports physical by a doctor to find out if it's safe to start a new sport or a new sports season. Most states require a sports physical before children and teens can play. Sports physicals ...

166

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

167

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

168

AN EXPERIMENT IN AGRICULTURAL CREDIT: THE SMALL FARMER GROUP LENDING PROGRAMME IN GHANA (1969-1980) \\/ UN EXPERIMENT DE CREDIT AGRICOLE: LE PROGRAMME DE CREDIT AUX GROUPES DE PETITS EXPLOITANTS AGRICOLES AU GHANA (1969-1980)  

Microsoft Academic Search

Cet article analyse en détail le programme de crédit aux regroupements de petits exploitants mis en place par la Agricultural Development Bank (ADB) au Ghana dans la période 1969-1980. Avant 1969, la Banque n'avait pas réussi à actroyer du crédit aux millions de petits exploitants qui produisent la plus grande partie de l'Output agricole du pays. Á l'époque, le crédit

Kwame Opoku Owusu; William Tetteh

1982-01-01

169

Physical Activities for Preschool.  

ERIC Educational Resources Information Center

The underlying premise of the University of Hawaii Physical Activities for Preschool curriculum is that important contributions to a positive self-concept are made by motor independence and a realistic body image. Program objectives include: (1) the development of strength, endurance, and flexibility in skills that involve the muscles,…

Adkins, Dorothy C.; And Others

170

Computations in Plasma Physics.  

ERIC Educational Resources Information Center

Discusses contributions of computers to research in magnetic and inertial-confinement fusion, charged-particle-beam propogation, and space sciences. Considers use in design/control of laboratory and spacecraft experiments and in data acquisition; and reviews major plasma computational methods and some of the important physics problems they…

Cohen, Bruce I.; Killeen, John

1983-01-01

171

Spin physics in perspective  

SciTech Connect

A variety of topics in spin physics was discussed at the conference. This summary attempts to highlight some of the contributions, but more especially to place the specific results in perspective and to emphasize the cross-fertilization that continually occurs. Topics range from spin excitation modes in nuclei, through dibaryons, to spin effects at high energies.

Measday, D.F.

1984-11-15

172

Top Quark Physics  

SciTech Connect

We give an overview of the physics of the Top quark, from the experimental discovery to the studies of its properties. We review some of the work done on the Electroweak and Flavor Changing couplings associated with the Top quark in the Standard Model and beyond. We will focus on the specific contribution of phycisits working in Mexico and Mexican physicists working abroad.

Larios, F. [Departmento de Fisica Aplicada, CINVESTAV-Merida, AP 73 Cordemex, 97310 Merida, Yucatan (Mexico)

2006-09-25

173

Physical Properties of Polymers  

NASA Astrophysics Data System (ADS)

This thoroughly revised and updated third edition is written by seven well-known authorities in the polymer science community. Each author contributes a chapter which reflects his own interests and expertise in the physical states and associated properties of polymers. Second Edition published by the American Chemical Society Hb (1993): 0-841-22505-2

Mark, James; Ngai, Kia; Graessley, William; Mandelkern, Leo; Samulski, Edward; Koenig, Jack; Wignall, George

2004-04-01

174

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

175

Atherosclerosis and Physical Activity  

PubMed Central

Atherosclerosis and coronary heart disease have been considered as major health problem worldwide. Abnormalities in lipids and lipoprotein metabolism and impairment of endothelial function have been implicated as the main contributing factors in atherosclerosis and its progression. Physical activity has been recognized as a preventive measure for atherosclerosis.

Al-Mamari, Ali

2009-01-01

176

Student Blogging about Physics  

Microsoft Academic Search

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,

Karen E. Daniels

2010-01-01

177

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

178

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

179

Rock mechanics contributions from defense programs  

Microsoft Academic Search

An attempt is made at illustrating the many contributions to rock mechanics from US defense programs, over the past 30-plus years. Large advances have been achieved in the technology-base area covering instrumentation, material properties, physical modeling, constitutive relations and numerical simulations. In the applications field, much progress has been made in understanding and being able to predict rock mass behavior

Heuze

1992-01-01

180

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

181

Teach Physics  

NSDL National Science Digital Library

Teach Physics is a video to excite and inspire undergraduate physics majors to pursue teaching careers. A teacher can have an impact on dozens of young lives every day. And qualified physics teachers are in high demand almost anywhere in the country. This innovative video showcases four dynamic young teachers who will inspire students to consider a career in teaching physics. As more and more careers require an understanding of science, and schools face a critical and growing need for qualified physics teachers, any student who might consider a career teaching physics should see this video.

Popkin, Gabriel

2010-04-12

182

Gestion des ressources hydriques adaptee aux changements climatiques pour la production optimale d'hydroelectricite. Etude de cas: Bassin versant de la riviere Manicouagan  

NASA Astrophysics Data System (ADS)

Il est dorenavant etabli que les changements climatiques auront des repercussions sur les ressources en eau. La situation est preoccupante pour le secteur de production d'energie hydroelectrique, car l'eau constitue le moteur pour generer cette forme d'energie. Il sera important d'adapter les regles de gestion et/ou les installations des systemes hydriques, afin de minimiser les impacts negatifs et/ou pour capitaliser sur les retombees positives que les changements climatiques pourront apporter. Les travaux de la presente recherche s'interessent au developpement d'une methode de gestion des systemes hydriques qui tient compte des projections climatiques pour mieux anticiper les impacts de l'evolution du climat sur la production d'hydroelectricite et d'etablir des strategies d'adaptation aux changements climatiques. Le domaine d'etude est le bassin versant de la riviere Manicouagan situe dans la partie centrale du Quebec. Une nouvelle approche d'optimisation des ressources hydriques dans le contexte des changements climatiques est proposee. L'approche traite le probleme de la saisonnalite et de la non-stationnarite du climat d'une maniere explicite pour representer l'incertitude rattachee a un ensemble des projections climatiques. Cette approche permet d'integrer les projections climatiques dans le probleme d'optimisation des ressources en eau pour une gestion a long terme des systemes hydriques et de developper des strategies d'adaptation de ces systemes aux changements climatiques. Les resultats montrent que les impacts des changements climatiques sur le regime hydrologique du bassin de la riviere Manicouagan seraient le devancement et l'attenuation de la crue printaniere et l'augmentation du volume annuel d'apports. L'adaptation des regles de gestion du systeme hydrique engendrerait une hausse de la production hydroelectrique. Neanmoins, une perte de la performance des installations existantes du systeme hydrique serait observee a cause de l'augmentation des deversements non productibles dans le climat futur. Des strategies d'adaptation structurale ont ete analysees pour augmenter la capacite de production et la capacite d'ecoulement de certaines centrales hydroelectriques afin d'ameliorer la performance du systeme. Une analyse economique a permis de choisir les meilleures mesures d'adaptation et de determiner le moment opportun pour la mise en oeuvre de ces mesures. Les resultats de la recherche offrent aux gestionnaires des systemes hydriques un outil qui permet de mieux anticiper les consequences des changements climatiques sur la production hydroelectrique, incluant le rendement de centrales, les deversements non productibles et le moment le plus opportun pour inclure des modifications aux systemes hydriques. Mots-cles : systemes hydriques, adaptation aux changements climatiques, riviere Manicouagan

Haguma, Didier

183

Physics Notes.  

ERIC Educational Resources Information Center

Presents nine physics notes for British secondary school teachers. Some of these notes are: (1) speed of sound in a steel rod; (2) physics extracts-part four (1978); and (3) a graphical approach to acceleration. (HM)

School Science Review, 1980

1980-01-01

184

Sports Physicals  

MedlinePLUS

... important. What Is a Sports Physical? In the sports medicine field, the sports physical exam is known as ... of any potential conditions you may have. Most sports medicine doctors believe the medical history is the most ...

185

Physical Allergy  

MedlinePLUS

... physical stimulus. Physical stimuli include the following: Cold Sunlight Heat or other stimuli that cause sweating (such ... a foreign substance and attacks it. Sensitivity to sunlight (photosensitivity) is an example. Ultraviolet light changes proteins ...

186

Physics Notes  

ERIC Educational Resources Information Center

Described are 13 physics experiments/demonstrations applicable to introductory physics courses. Activities include: improved current balance, division circuits, liquid pressure, convection, siphons, oscillators and modulation, electrical resistance, soap films, Helmholtz coils, radioactive decay, and springs. (SL)

School Science Review, 1976

1976-01-01

187

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 ...

188

Physical activity  

MedlinePLUS

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

189

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

190

Physical Therapists  

MedlinePLUS

... prerequisites, such as anatomy, physiology, biology, chemistry, and physics. Most DPT programs require applicants to apply through ... annual wages, May 2012 Physical therapists $79,860 Health diagnosing and treating practitioners $73,410 Total, all ...

191

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

192

Physics Today  

NSDL National Science Digital Library

This online magazine contains articles relating to physics and its applications today, as well as a community for members. The Physics Today website also contains job announcements and current news feeds.

Physics, American I.

2005-02-07

193

Interactive Physics  

NSDL National Science Digital Library

Interactive Physics is a complete modeling and simulation environment that allows teachers and students to explore physics concepts such as mechanics, conservation of energy, vectors, time/distance/force equations, planetary motion, relative motion and electrostatics.

Msc.software

2003-10-10

194

High temperature thermoelectric properties of the type-I clathrate Ba8AuxSi46-x  

NASA Astrophysics Data System (ADS)

The thermoelectric properties of the type-I clathrate Ba8AuxSi46-x (4.10 <= x <= 6.10) were characterized from 300 to 700 K. Increasing the Au concentration leads to a transition from an n-type (x < 5.43) to a p-type (x >= 5.43) electrical conduction. The experimental data are well described by a single-parabolic-band model assuming a single scattering mechanism of the charge carriers in this temperature range. The lattice thermal conductivity, inferred from degeneracy-adjusted Lorenz numbers, is low regardless of the composition. However, the measured values are significantly lower in the p-type samples possibly due to a combination of a higher degree of disorder in the crystal structure at high Au contents and an enhanced phonon-charge carrier coupling. Even though high thermopower values are achieved, the high electrical resistivity remains the main obstacle to push the dimensionless figure of merit ZT (~0.2 at around 600 K for x = 5.59) beyond the level of the best Si-based clathrate compounds.

Candolfi, C.; Aydemir, U.; Baitinger, M.; Oeschler, N.; Steglich, F.; . Grin, Yu

2012-02-01

195

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

196

Panel acoustic contribution analysis.  

PubMed

Formulations are derived to analyze the relative panel acoustic contributions of a vibrating structure. The essence of this analysis is to correlate the acoustic power flow from each panel to the radiated acoustic pressure at any field point. The acoustic power is obtained by integrating the normal component of the surface acoustic intensity, which is the product of the surface acoustic pressure and normal surface velocity reconstructed by using the Helmholtz equation least squares based nearfield acoustical holography, over each panel. The significance of this methodology is that it enables one to analyze and rank relative acoustic contributions of individual panels of a complex vibrating structure to acoustic radiation anywhere in the field based on a single set of the acoustic pressures measured in the near field. Moreover, this approach is valid for both interior and exterior regions. Examples of using this method to analyze and rank the relative acoustic contributions of a scaled vehicle cabin are demonstrated. PMID:23363099

Wu, Sean F; Natarajan, Logesh Kumar

2013-02-01

197

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

198

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

199

Contributed Papers, 1967.  

ERIC Educational Resources Information Center

Included are six papers from the Special Libraries Association Documentation Division's Contributed Papers Session at the National Conference in New York, May 28 - June 1, 1967, which were not included in the November, 1967 issue of Special Libraries. The papers are: (1) "The Bibliographical Control of Aerospace Industry Conference Literature…

Special Libraries Association, New York, NY. Documentation Div.

200

Physics Education  

NSDL National Science Digital Library

Based at Harvard University, the Mazur Group is headed by Professor Eric Mazur who teaches physics and applied physics. Professor Mazur, his lab colleagues, and students worked to create this website on physics education. The site brings their own research into the classroom experience and provides resources for teaching physics. The "Areas of Research" includes information on collaborative learning via peer instruction, gender differences in introductory physics courses, and the value of classroom demonstrations. Each of these areas contains a brief summary of the Mazur Group's work in each area, and visitors can sign up for updates. Further down on the site, visitors can look through a book on peer instruction (complete with resource material) and the proceedings from a National Science Foundation conference that deals with teaching physics.

201

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

202

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

203

Physics 2000  

NSDL National Science Digital Library

Physics 2000 relies heavily on the use of interactive applets. These are different from the typical animations you see on the Internet because you can actually interact with them. This is an older site from the Center for Integrated Plasma Studies at the University of Colorado, Boulder. It uses cartoon characters to explain physics concepts. A downloadable version of Physics 2000 is available by contacting the Center for Integrated Plasma Studies via postal mail.

2010-05-25

204

Kepler's physical astronomy  

NASA Astrophysics Data System (ADS)

The contributions of Johannes Kepler to astronomy and celestial mechanics are examined in a historical and analytical study. The 'Astronomia nova' is treated as a single argument, in an effort to show how Kepler laid the foundations of physical astronomy, and individual chapters are devoted to the 'Mysterium cosmographicum,' the 'Epitome Astronomiae Copernicanae,' and Kepler and the development of modern science. Extensive diagrams, a glossary of terms, and an index to the 'Astronomia nova' are provided.

Stephenson, Bruce

205

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

206

Differences in Physical Activity during School Recess  

ERIC Educational Resources Information Center

Background: School recess provides a daily opportunity for physical activity engagement. The purpose of this study was to examine physical activity levels during recess by gender, ethnicity, and grade, and establish the contribution of recess to daily school physical activity levels. Methods: Two hundred and ten children (45% boys) from grades 3…

Ridgers, Nicola D.; Saint-Maurice, Pedro F.; Welk, Gregory J.; Siahpush, Mohammad; Huberty, Jennifer

2011-01-01

207

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

208

Teaching School Physics. A UNESCO Source Book.  

ERIC Educational Resources Information Center

This UNESCO source book on teaching physics in schools provides a synthesis of views and policies prevalent throughout the world with respect to physics education. The book's contents are contributed by educators from several nations who have been able to give an international outlook in the discussion of various aspects of physics education. The…

Lewis, John L., Ed.

209

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,F.

2009-05-25

210

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

211

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,F.

2009-05-26

212

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

213

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

214

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

215

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

216

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

217

Teaching Physics  

NSDL National Science Digital Library

This book is intended for researchers in science teaching, teacher trainers, and teachers of physics. This book seeks to narrow the gap between Physics Education Research and classroom practice. Using detailed analysis of current research, it supports more effective teaching practices and gives five lesson outlines designed for student discourse.

Viennot, Laurence

2007-07-09

218

197Au and125Te Mössbauer spectroscopic study on the low temperature phases of Ag3AuX2 (X=S, Se, and Te)  

NASA Astrophysics Data System (ADS)

197Au and125Te Mössbauer spectroscopy has been applied for the low-temperature ?-phases of Ag3AuX2 (X=S, Se, and Te). The values of I. S. and Q. S. for197Au suggest that the gold atoms, linearly coordinated by two chalcogen atoms in these phases, exist as monovalent cations. The125Te Mössbauer spectra suggest that the tellurium atoms are substantially ionic for both Ag2Te and Ag3AuTe2. The nature of X-Au-X bonds is discussed on the basis of the Mössbauer data and the bond distances.

Sakai, Hiroshi; Ando, Manabu; Maeda, Yutaka

1992-04-01

219

Relativistic heavy ion physics  

NASA Astrophysics Data System (ADS)

This is a progress report for the period May 1992 through April 1993. The first section, entitled 'Purpose and Trends,' gives background on the recent trends in the research program and its evolution from an emphasis on nuclear structure physics to its present emphasis on relativistic heavy ion and RHIC physics. The next section, entitled 'Physics Research Progress,' is divided into four parts: participation in the program to develop a large detector named PHENIX for the RHIC accelerator; joining E864 at the AGS accelerator and the role in that experiment; progress made in the study of electromagnetic dissociation, the highlight of this endeavor being an experiment carried out with the Au-197 beam from the AGS accelerator in April 1992; and progress in completion of the nuclear structure studies. In the final section a list of publications, invited talks, and contributed talks is given.

Hill, J. C.; Wohn, F. K.

220

The Physics of Semiconductors  

NASA Astrophysics Data System (ADS)

The historic development of semiconductor physics and technology began in the second half of the 19th century. Interesting discussions of the early history of the physics and chemistry of semiconductors can be found in treatises of G. Busch [2] and Handel [3]. The history of semiconductor industry can be followedin the text of Morris [4] and Holbrook et al. [5]. In 1947, the realization of the transistor was the impetus to a fast-paced development that created the electronics and photonics industries. Products founded on the basis of semiconductor devices such as computers (CPUs, memories), optical-storage media (lasers for CD, DVD), communication infrastructure (lasers and photodetectors for optical-fiber technology, high frequency electronics for mobile communication), displays (thin film transistors, LEDs), projection (laser diodes) and general lighting (LEDs) are commonplace. Thus, fundamental research on semiconductors and semiconductor physics and its offspring in the form of devices has contributed largely to the development of modern civilization and culture.

Grundmann, Marius

221

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

222

Interstellar Dust: Contributed Papers  

NASA Technical Reports Server (NTRS)

A coherent picture of the dust composition and its physical characteristics in the various phases of the interstellar medium was the central theme. Topics addressed included: dust in diffuse interstellar medium; overidentified infrared emission features; dust in dense clouds; dust in galaxies; optical properties of dust grains; interstellar dust models; interstellar dust and the solar system; dust formation and destruction; UV, visible, and IR observations of interstellar extinction; and quantum-statistical calculations of IR emission from highly vibrationally excited polycyclic aromatic hydrocarbon (PAH) molecules.

Tielens, Alexander G. G. M. (editor); Allamandola, Louis J. (editor)

1989-01-01

223

TEACHING PHYSICS: Teaching particle physics  

NASA Astrophysics Data System (ADS)

Particle physics attracts many students who hear of news from CERN or elsewhere in the media. This article examines which current A-level syllabuses include which bits of particle physics and surveys the many different types of resource available to teachers and students.

Hanley, Phil

2000-09-01

224

Workshop Physics  

NSDL National Science Digital Library

Workshop Physics is an activity-based approach to teaching calculus-based introductory physics in which traditional lectures are replaced by student investigation. Students do experiments in which they make predictions as well as observations and analysis; they perform guided derivations of major concepts; and they use computer tools to develop mathematical models. All the activities and materials needed for a two-semester course are available in the published books, with example materials available online. Workshop Physics was developed and class-tested by Priscilla Laws of Dickinson College and coworkers.

Laws, Priscilla W.

2003-10-10

225

Physical urticaria.  

PubMed

Physical urticarias are a unique subgroup of chronic urticaria in which patients develop urticaria secondary to environmental stimuli. Common triggers include exercise, temperature changes, cold, heat, pressure, sunlight, vibration, and water. Systemic symptoms have occurred during severe episodes. Physical urticarias are responsible for approximately 20% to 30% of all cases of chronic urticaria. A basic knowledge of these unusual disorders is important for all healthcare providers. This article covers the following types of physical urticarias: dermatographism, cholinergic urticaria, local heat urticaria, exercise-induced anaphylaxis, vibratory angioedema, solar urticaria, and aquagenic urticaria. PMID:15120149

Dice, John P

2004-05-01

226

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

227

Spiral Physics  

NSDL National Science Digital Library

Spiral Physics is a research based introductory physics curriculum developed at Monroe Community College. There are several important features of this curriculum. It integrates text and workbook activities in a modular fashion, and arranges topics so that students receive repeated exposure to concepts with increased complexity. It makes use of alternative problem types, including goal-less problem statements, ranking tasks, and critical analysis tasks. It restricts the equation set available for student use and is designed to facilitate active learning. Spiral Physics is available for both the algebra-based and calculus-based introductory courses. Assessment of Spiral Physics via the FCI, MBT, and MPEX compare favorably with the best results reported in the literature.

D'Alessandris, Paul

2010-03-24

228

Supercollider physics  

SciTech Connect

The physics that can be explored with multi-TeV supercolliders is reviewed, including parton distributions, hadron jet production, the standard electroweak theory and minimal extensions to it, technicolor, supersymmetry, and compositeness. 19 refs., 11 figs. (LEW)

Quigg, C.

1985-03-01

229

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

230

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

231

Physics Notes.  

ERIC Educational Resources Information Center

Presents activities, experiments, demonstrations, and equipment for physics instruction, including computer applications of sports biomechanics, vibrating magnetometer, alternative uses for an environmental comparator, CMOS integrated circuit logic tutor, and an activity demonstrating positive and negative leakage. (JN)

School Science Review, 1981

1981-01-01

232

Combustion Physics.  

ERIC Educational Resources Information Center

Discusses how physics is used to improve the efficiency of combustion, pointing out that the interdisciplinary topic has applications to problems of real industrial relevance and practical value. (JN)

Jones, A. R.

1985-01-01

233

Nuclear Physics  

Microsoft Academic Search

Nuclear Physics is the branch of physics that deals with the properties and\\u000astructure of matter on the hadronic level. In this article we review briefly\\u000athe history of this field, which has a major role in the development of our\\u000aunderstanding of nature. We then proceed to give an outline of a current\\u000aperspective of the field and of

E. M. Henley; J. P. Schiffer

1935-01-01

234

Charm physics  

NASA Astrophysics Data System (ADS)

Charm physics is an active and productive field at hadron colliders. In these proceedings an overview of recent results in charm physics from the Tevatron and LHC experiments is given. Highlighted are the measurements of open charm production and production asymmetries, the recent precision measurements of the D masses, the confirmation of mixing in the D0 system, the searches for CP violation in the charm system and the searches for rare charm decays.

van Tilburg, J.

2013-11-01

235

Physical allergies.  

PubMed

Allergic responses that occur as a result of exposure to physical stimuli are discussed. Most of these conditions are mediated by vasoactive substances, resulting in urticaria and/or angioedema. Susceptible individuals who engage in athletic activities may place themselves at particular risk for these problems. The physical allergies include cholinergic urticaria, exercise-induced anaphylaxis, cold urticaria, dermatographism, solar urticaria, and aquagenic urticaria. Management of these conditions includes patient education, selective avoidance, antihistamines, and, in some cases, induction of tolerance. PMID:1406166

Horan, R F; Sheffer, A L; Briner, W W

1992-08-01

236

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

237

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

238

Radiographie par rayons X à haute résolution de défauts topologiques en volume de structures modulées comparée aux neutrons en faisceau blanc  

NASA Astrophysics Data System (ADS)

Une émission de rayons X par un générateur à haute tension (plage : 50 - 410 kV) a été développée pour être utilisée avec un diffractomètre à rayons X durs et caractériser en volume des monocristaux. Le fort flux issu d'une installation de radiologie à foyer fin avec un grand pouvoir de pénétration en profondeur autorise l'étude d'échantillons très absorbants. Quelques exemples de l'utilisation de ces propriétés pour des échantillons épais et très absorbants sont présentés ; principalement l'analyse de contraintes et la topographie X projetée 2D dans des matériaux en comparaison avec l'information par la diffraction des neutrons. La diffraction à haute énergie apparaît dans la direction transmise, les angles de Bragg sont petits et ainsi les différentes lignes de réflexions sont réparties autour du faisceau principal. La presse uni-axiale utilisée pour les expériences est optimisée effectivement avec l'absence d'un bruit de fond dû à l'usage de fentes. L'optique des rayons X durs et neutrons appliquée aux échantillons épais donne une information complémentaire dans les expériences sur l'analyse de la densité volumétrique par la diffusion des rayons X et neutrons. On l'applique à des problèmes concernant des cristaux aux structures modulées étudiées sous des charges mécaniques et thermiques.

Fernandez Palacio, J.; Hamelin, B.; Marmeggi, J. C.

2004-11-01

239

Analyse quantitative des foraminifères benthiques actuels de la marge atiantique marocaine entre Cap Draˆa et Cap Juby: reponses fauniques aux changements de l'environnement  

NASA Astrophysics Data System (ADS)

La population des foraminifères benthiques actuels de la marge atlantique marocaine, entre Cap Draˆa et Cap Juby, aétéétudiée dans 58 prélèvements parmi 430 répartis suivant un système de radiales perpendiculaireàla ligne de rivage. Quarante-sept espèces parmi 104 appartenantà58 genres et 28 familles ontétéreconnues. Les abondances absolues de chacune des espèces ontétécomparées dans les différents prélèvements ainsi que les indices biocénotiques (richesse spécifique, abondance, indice de pélagisme, nombre d'espèces benthiques enroulées, nombre d'espèces benthiques costulées) et les paramètres abiotiques (nature de substrat et profondeur). L'analyse factorielle des correspond ances, complétée par la classification hiérarchique et la projection des paramètres biotiques et abiotiques en tant que colonnes supplémentaires ont révéléclue la profondeur est le facteur principal de la distribution des espèces et des prélèvements. En effet, elle oppose les associations d'espèces infralittorales enroulées lisses aux associations d'espècesépibathyales rectilignes ornées, les espèces circalittorales occupent une position intermédiaire. Le facteur secondare correspondàla nature du substrat, oppose les associations d'espèces vasicoles aux associations d'espèces sabulicoles aussi bien celles de l'environnement infralittoral que celles de l'épibathyal.

Rezqi, H.; Oujidi, M.; Boutakiout, M.; Labraimi, M.

2000-02-01

240

Endosidin1 defines a compartment involved in endocytosis of the brassinosteroid receptor BRI1 and the auxin transporters PIN2 and AUX1  

PubMed Central

Although it is known that proteins are delivered to and recycled from the plasma membrane (PM) via endosomes, the nature of the compartments and pathways responsible for cargo and vesicle sorting and cellular signaling is poorly understood. To define and dissect specific recycling pathways, chemical effectors of proteins involved in vesicle trafficking, especially through endosomes, would be invaluable. Thus, we identified chemicals affecting essential steps in PM/endosome trafficking, using the intensely localized PM transport at the tips of germinating pollen tubes. The basic mechanisms of this localized growth are likely similar to those of non-tip growing cells in seedlings. The compound endosidin 1 (ES1) interfered selectively with endocytosis in seedlings, providing a unique tool to dissect recycling pathways. ES1 treatment induced the rapid agglomeration of the auxin translocators PIN2 and AUX1 and the brassinosteroid receptor BRI1 into distinct endomembrane compartments termed “endosidin bodies”; however, the markers PIN1, PIN7, and other PM proteins were unaffected. Endosidin bodies were defined by the syntaxin SYP61 and the V-ATPase subunit VHA-a1, two trans-Golgi network (TGN)/endosomal proteins. Interestingly, brassinosteroid (BR)-induced gene expression was inhibited by ES1 and treated seedlings displayed a brassinolide (BL)-insensitive phenotype similar to a bri1 loss-of-function mutant. No effect was detected in auxin signaling. Thus, PIN2, AUX1, and BRI1 use interactive pathways involving an early SYP61/VHA-a1 endosomal compartment.

Robert, Stephanie; Chary, S. Narasimha; Drakakaki, Georgia; Li, Shundai; Yang, Zhenbiao; Raikhel, Natasha V.; Hicks, Glenn R.

2008-01-01

241

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

242

Relativistic heavy ion physics  

NASA Astrophysics Data System (ADS)

In 1992 a proposal by the Iowa State University experimental nuclear physics group entitled 'Relativistic Heavy Ion Physics' was funded by the US Department of Energy, Office of Energy Research, for a three-year period beginning November 15, 1991. This is a progress report for the first six months of that period but, in order to give a wider perspective, we report here on progress made since the beginning of calendar year 1991. In the first section, entitled 'Purpose and Trends,' we give some background on the recent trends in our research program and its evolution from an emphasis on nuclear structure physics to its present emphasis on relativistic heavy ion and RHIC physics. The next section, entitled, 'Physics Research Programs,' is divided into three parts. First, we discuss our participation in the program to develop a large detector named PHENIX for the RHIC accelerator. Second, we outline progress made in the study of electromagnetic dissociation (ED). A highlight of this endeavor is experiments carried out with the Au-197 beam from the AGS accelerator in April 1991. Third, we discuss progress in completion of our nuclear structure studies. In the final section, a list of publications, invited talks and contributed talks starting in 1991 is given.

Hill, J. C.; Wohn, F. K.

243

Physics Quizzes and Physics Trivia  

NSDL National Science Digital Library

On this site, visitors can access thirty-five quizzes, each with five to ten questions, covering various aspects of physics. The topics here include: special relativity, OhmâÂÂs lore, orbital mechanics, inside the atom, types of energy storage, and subatomic and modern physics. For accessibility, each quiz can be played in either Flash or html format. Also, each questionâÂÂs answer contains a brief explanation why it is the correct answer to help visitors more thoroughly understand the physics principle being tested. This is a useful resource for students to refresh or enhance their knowledge of physics, or for educators to use in the classroom to test studentsâ understanding.

2007-04-18

244

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

245

[Physical urticarias].  

PubMed

Ten percent of chronic urticarias are physical urticarias. Patients suffering from physical urticaria all have a suggestive history with specific eliciting stimuli (cold, heat, water, sun.) and wheals in the areas where the stimulus acts. The involved pathomechanisms are not well known. An unknown allergen (related to a cold or a heat injury, a polar molecule contained in the stratum corneum and soluble into water, a photoallergen) could induce a mast cell mediator release, followed by an infiltration by eosinophil then neutrophils polymorphonuclears. T-cells are not highly involved. Dermographism, the most frequent can be cured by anti-H1. In diagnosing cholinergic urticaria physical exercise has to be done by the patient (jogging, running, riding), anti-H1 are efficient. In other physical urticarias (delayed-pressure, cold, solar, heat, vibratory urticarias) as to be managed as follows: (1) to perform specific tests with respectively (weights; ice cube; UVA, UVB and visible light exposure; hot water contained in a tube; a vortex mixer); (2) to avoid eliciting stimuli; (3) to treat the associated diseases e.g. in secondary cold urticaria; (4) to try to induce a physical tolerance, a review is enclosed concerning cold, solar, heat and aquagenic urticarias; (5) to associate or not non sedative 2(nd) generation antihistamines. All the other alternative treatments are discussed but none of them has been evaluated. PMID:12843805

Barbaud, A

2003-05-01

246

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

247

Physical Processes in Stellar Interiors  

NASA Technical Reports Server (NTRS)

The author set himself three fundamental tasks: (1) To show how modern atomic and nuclear physics can contribute to the description of processes in stellar interiors. (2) To present the fundamentals of the methods for calculating physical processes taking place at temperatures of millions of degrees. (3) To provide the required minimum of information on problems of atomic and nuclear physics to astrophysicists, and on astronomical problems to physicists. The book is divided into four parts, the Introduction, the Theory of Stationary Processes, the Applications of the Theory of Stationary Processes and the Theory of Non-Stationary Processes.

Frank-Kamenetskii, D. A.

1962-01-01

248

Mexican contributions to Noncommutative Theories  

SciTech Connect

In this paper we summarize the Mexican contributions to the subject of Noncommutative theories. These contributions span several areas: Quantum Groups, Noncommutative Field Theories, Hopf algebra of renormalization, Deformation Quantization, Noncommutative Gravity, and Noncommutative Quantum Mechanics.

Vergara, J. David [Instituto de Ciencias Nucleares, UNAM, A. Postal 70-543, Mexico, D.F. Mexico (Mexico); Garcia-Compean, H. [Centro de Investigacion y de Estudios Avanzados del IPN, Unidad Monterrey, Cerro de las Mitras 2565, Col. Obispado, Monterrey N.L. 64060 (Mexico); Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del IPN, Apdo. Postal 14-740, Mexico D.F. 07000 (Mexico)

2006-09-25

249

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

250

Physics Topics  

NSDL National Science Digital Library

This web site contains in-depth notes with examples and practice problems for several topics in introductory physics and astronomy. Some of these topics include classical mechanics, geometric optics, celestial mechanics, and stellar atmospheres. All of the topics may be downloaded for use offline.

Tatum, J. B.

2006-07-18

251

Optical Physics  

Microsoft Academic Search

Optical science, the science that studies the nature of light, can be approached from several different angles. In this third edition of a successful and well-established text, the author focuses on physical and geometrical optics. The text is based largely on Fourier analysis and shows how this method can be used to describe wave propagation and diffraction and their applications

Stephen G. Lipson; Henry Lipson; David Stefan Tannhauser

1995-01-01

252

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

253

Physical Security  

SciTech Connect

The future of physical security at government facilities and national laboratories is rapidly progressing beyond the cliché of gates, guns and guards, and is quickly being replaced by radars, sensors and cameras. Learn more about INL's security research at http://www.facebook.com/idahonationallaboratory.

None

2008-01-01

254

Physical Security  

ScienceCinema

The future of physical security at government facilities and national laboratories is rapidly progressing beyond the cliché of gates, guns and guards, and is quickly being replaced by radars, sensors and cameras. Learn more about INL's security research at http://www.facebook.com/idahonationallaboratory.

255

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

256

Physics Demonstrations  

NSDL National Science Digital Library

The teaching of physics is clearly enhanced by the use of demonstrations. Visual examples of abstract concepts aid immeasurably in their mastery. They also provide an opportunity to illustrate the scientific method and to teach the student to relate experimental observation to scientific theory. Experiments represent the means by which scientific knowledge has advanced so rapidly in modern times. Finally, not to be underestimated, the use of demonstrations makes the learning of physics much more enjoyable! This book is a compilation of many of the demonstrations that have been used at the University of Wisconsin - Madison in the teaching of elementary physics over the years as well as a number of demonstrations that I have developed for use in a series of popular lectures, "The Wonders of Physics," aimed at the general public and children in particular. Included also are a number of demonstrations that have been suggested and used by friends or colleagues. All of the demonstrations have been thoroughly tested in a classroom setting or before an audience of the general public.

Sprott, Julien

2009-05-20

257

Motorcycle Physics.  

ERIC Educational Resources Information Center

At the end of a secondary school science study of mechanics, a summary lab uses a motorcycle to provide students with the chance to apply some of the concepts they have studied. Exercises from this motorcycle physics lab are discussed. (Author/JN)

Engel, Chuck; Girard, Barbara

1983-01-01

258

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

259

Physics Notes.  

ERIC Educational Resources Information Center

Discusses dice model of exponential radionuclide decay; glancing and collinear perfectly elastic collisions; digital capacitance meter; use of top pan balance in physics; microcomputer calculation of gradient of straight line (includes complete Commodore PET computer program); Fresnel lenses; low-voltage radiant heater; Wheatssone's bridge used as…

School Science Review, 1982

1982-01-01

260

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

261

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

262

Physical Units  

NSDL National Science Digital Library

This page, authored by Rod Nave at Georgia State University, 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, Rod

2010-01-14

263

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

264

Coronal and chromospheric physics  

NASA Technical Reports Server (NTRS)

Achievements and completed results are discussed for investigations covering solar activity during the solar maximum mission and the solar maximum year; other studies of solar activity and variability; infrared and submillimeter photometry; solar-related atomic physics; coronal and transition region studies; prominence research; chromospheric research in quiet and active regions; solar dynamics; eclipse studies; and polarimetry and magnetic field measurements. Contributions were also made in defining the photometric filterograph instrument for the solar optical telescope, designing the combined filter spectrograph, and in expressing the scientific aims and implementation of the solar corona diagnostic mission.

Jefferies, J. T.; Landman, D. A.; Orrall, F. Q.

1983-01-01

265

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).

266

Progress in cloud physics research  

Microsoft Academic Search

This progress report summarises the researches of the cloud physics group at Imperial College during the last four years 1949–1952. It describes work carried out on the following topics: 1. the spontaneous condensation of water vapour; 2. measurements on the concentration and size distribution of sea-salt nuclei over the N. Atlantic and their contribution to atmospheric opacity; 3. laboratory and

B. J. Mason

1953-01-01

267

The muon: a laboratory for 'New Physics'  

NASA Astrophysics Data System (ADS)

The utility of electroweak radiative corrections for testing the standard model and probing 'New Physics' is reviewed. The muon lifetime's central role in those studies is explained. Alberto Sirlin's pioneering contributions to that program are recalled.

Marciano, William J.

2003-01-01

268

Physics Teacher Preparation---Brigham Young Universities Physics Departments efforts in Physics Teacher Training  

NASA Astrophysics Data System (ADS)

Following BYU's recent decision to shift shared responsibility of secondary science education programs into areas of each specific discipline, BYU's College of Physical and Mathematical Sciences has taken on the role of preparing future junior high and high school teachers. To prepare teachers and to enhance the college's physical science teacher education program the College of Physical Science was able to hire a full time faculty member. This position was made available with the shift of a faculty position from the McKay School of Education. This contributed talk will discuss the implementation of this shift of responsibility, the impact on physics and physical science teacher preparation and things we have learned along the way.

Merrell, Duane

2010-03-01

269

Plasma Physics and Controlled Nuclear Fusion  

NASA Astrophysics Data System (ADS)

Already while making his famous contributions in uncontrolled nuclear fusion for wartime uses, Edward Teller contemplated how the abundant energy release through nuclear fusion might serve peacetime uses as well. His legacy in controlled nuclear fusion, and the associated physics of plasmas, spans both magnetic and inertial confinement approaches. His contributions in plasma physics, both the intellectual and the administrative, continue to impact the field.

Fisch, N. J.

2010-01-01

270

EDITORIAL: Physics competitions Physics competitions  

NASA Astrophysics Data System (ADS)

International tests on competences, such as TIMSS or PISA, and knowledge of young students have revealed low average scores in many countries, often unexpectedly. One effective measure to increase the average standard of a population is to bring the last third of the group to a higher level. Therefore, many nations put some effort into this activity. This brings the danger that not enough attention is paid to students at the other end, those who are talented. Indeed, it is a very difficult task for a teacher to support the less able and at the same time challenge the gifted students, to lead them to the limits of their abilities and provide for a smooth transition to university study. Physics competitions have been proven to fulfil these last demands to a large degree, and therefore are an important additional and, to some extent, complementary tool for the promotion of talented students. This third special section on physics competitions in European Journal of Physics contains three papers, each dealing with a different form of science contest. The first continues the series of presentations of tasks performed at the International Young Physicists' Tournament, which was held in Vienna in 2011. First place went to the team from Singapore, and they have put their investigation on vertical oscillations of coupled magnets into written form (not required by the tournament, where an oral presentation and a defence and discussion are the central aspects). Their paper shows how rich in physics this problem is, and what level of solutions high-school students can already achieve. Sadly, those responsible for the organization of last year's International Physics Olympiad did not provide us with a report on this competition. This is unfortunate, since the Olympiad in Zagreb was very successful and, in particular, the experimental tasks were creative and demanding. Very similar to the aims and the execution of the Physics Olympiad is the International Olympiad on Astronomy and Astrophysics. Those in charge of the competition give an overview of this relatively young tournament. They give a few examples of theoretical and experimental tasks, and one can see the strong connection between astronomy and physics, between the large scales in the universe and the small scales in particle physics. The third paper introduces a special competition called 'First Step to Nobel Prize in Physics'. It was conceived as a national event in Poland and has gained international reputation and acceptance since 1992. Papers are submitted from young students prior to university and are refereed in the same manner as real research papers. This means that the most important criterion is the originality and novelty of the activity performed in theoretical or experimental physics. The aims of this competition are set out below and can be seen as a credo for all competitions: promotion of scientific interest among young pupils selection and promotion of outstanding pupils enhancing motivation stimulation of school work establishing friendly relations between young physicists.

Jordens, H.; Mathelitsch, L.

2011-07-01

271

Conceptual Physics  

NSDL National Science Digital Library

From Prentice Hall and Pearson Education comes the online Conceptual Physics Tutorial. The site provides information for students on mechanics, properties of matter, heat, sound and light, electricity and magnetism, and atomic and nuclear physics. Each chapter contains subheadings and various described links to sites that focus on that particular subject. Under momentum, for example, more than a dozen sites are included under subheadings such as impulse changes, bouncing, conservation of momentum, collisions, and momentum vectors. Other highlights of the site include links to simulations found on the Web and questions of the week, along with their answer. Even though some of the provided links were dead, the repository of information should prove useful to visitors.

Hewitt, Paul G.

2007-05-26

272

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

273

Conceptual Physics  

NSDL National Science Digital Library

From Prentice Hall and Pearson Education comes the online Conceptual Physics Tutorial. The site provides information for students on mechanics, properties of matter, heat, sound and light, electricity and magnetism, and atomic and nuclear physics. Each chapter contains subheadings and various described links to sites that focus on that particular subject. Under momentum, for example, more than a dozen sites are included under subheadings such as impulse changes, bouncing, conservation of momentum, collisions, and momentum vectors. Other highlights of the site include links to simulations found on the Web and questions of the week, along with their answer. Even though some of the provided links were dead, the repository of information should prove useful to visitors.

Hewitt, Paul G.

2003-01-01

274

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.

275

Unparticle Physics  

SciTech Connect

I discuss some simple aspects of the low-energy physics of a nontrivial scale invariant sector of an effective field theory--physics that cannot be described in terms of particles. I argue that it is important to take seriously the possibility that the unparticle stuff described by such a theory might actually exist in our world. I suggest a scenario in which some details of the production of unparticle stuff can be calculated. I find that in the appropriate low-energy limit, unparticle stuff with scale dimension d{sub U} looks like a nonintegral number d{sub U} of invisible particles. Thus dramatic evidence for a nontrivial scale invariant sector could show up experimentally in missing energy distributions.

Georgi, Howard [Center for the Fundamental Laws of Nature, Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138 (United States)

2007-06-01

276

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

277

Doughy Physics  

NSDL National Science Digital Library

Learners drop two different masses of play dough and observe how long it takes them to hit the ground. Learners also drop two pieces of paper of the same material and size, one crumpled and one flat, to see how air resistance affects the speed at which an object falls. This activity starts on p.8 of the manual. This manual contains 4 activities related to the Spectra's Force comic book published by the American Physical Society.

Thompson, Rebecca; Johnson, Kerry G.; Ellis, David; Bennett-Karasik, Nancy

2011-01-01

278

Physical Impairment  

Microsoft Academic Search

\\u000a Many health conditions can lead to physical impairments that impact computer and Web access. Musculoskeletal conditions such\\u000a as arthritis and cumulative trauma disorders can make movement stiff and painful. Movement disorders such as tremor, Parkinsonism\\u000a and dystonia affect the ability to control movement, or to prevent unwanted movements. Often, the same underlying health condition\\u000a also has sensory or cognitive effects.

Shari Trewin

2008-01-01

279

Solar Physics  

NASA Technical Reports Server (NTRS)

The areas of emphasis are: (1) develop theoretical models of the transient release of magnetic energy in the solar atmosphere, e.g., in solar flares, eruptive prominences, coronal mass ejections, etc.; (2) investigate the role of the Sun's magnetic field in the structuring of solar corona by the development of three-dimensional numerical models that describe the field configuration at various heights in the solar atmosphere by extrapolating the field at the photospheric level; (3) develop numerical models to investigate the physical parameters obtained by the ULYSSES mission; (4) develop numerical and theoretical models to investigate solar activity effects on the solar wind characteristics for the establishment of the solar-interplanetary transmission line; and (5) develop new instruments to measure solar magnetic fields and other features in the photosphere, chromosphere transition region and corona. We focused our investigation on the fundamental physical processes in solar atmosphere which directly effect our Planet Earth. The overall goal is to establish the physical process for the Sun-Earth connections.

Wu, S. T.

2000-01-01

280

Soil physics: a Moroccan perspective  

NASA Astrophysics Data System (ADS)

Research on environmental pollution and degradation of soil and water resources is now of highest priority worldwide. To address these problems, soil physics should be conceived as a central core to this research. This paper objectives are to: (1) address the role and importance of soil physics, (2) demonstrate progress in this discipline, and (3) present various uses of soil physics in research, environment and industry. The study of dynamic processes at and within the soil vadose zone (flow, dispersion, transport, sedimentation, etc.), and ephemeral phenomena (deformation, compaction, etc.), form an area of particular interest in soil physics. Soil physics has changed considerably over time. These changes are due to needed precision in data collection for accurate interpretation of space and time variation of soil properties. Soil physics interacts with other disciplines and sciences such as hydro(geo)logy, agronomy, environment, micro-meteorology, pedology, mathematics, physics, water sciences, etc. These interactions prompted the emergence of advanced theories and comprehensive mechanisms of most natural processes, development of new mathematical tools (modeling and computer simulation, fractals, geostatistics, transformations), creation of high precision instrumentation (computer assisted, less time constraint, increased number of measured parameters) and the scale sharpening of physical measurements which ranges from micro to watershed. The environment industry has contributed to an enlargement of many facets of soil physics. In other words, research demand in soil physics has increased considerably to satisfy specific and environmental problems (contamination of water resources, global warming, etc.). Soil physics research is still at an embryonic stage in Morocco. Consequently, soil physicists can take advantage of developments occurring overseas, and need to build up a database of soil static and dynamic properties and to revise developed models to meet our conditions. Large, but special, investment is required to promote research programs in soil physics, which consider developments in this discipline and respect Moroccan needs. These programs will be highlighted herein.

Lahlou, Sabah; Mrabet, Rachid; Ouadia, Mohamed

2004-06-01

281

Elevated Seismic Activity Beneath the Slumbering Morne aux Diables Volcano, Northern Dominica and the Monitoring Role of the Seismic Research Centre  

NASA Astrophysics Data System (ADS)

Since June 2009, periods of elevated seismic activity have been experienced around the flanks of Morne Aux Diables Volcano in northern Dominica. This long-dormant volcano is a complex of 7 andesitic lava domes with a central depression where a cold soufrière is evident. Prior to this activity, seismicity was very quiet except for a short period in 2000 and an intense short-lived swarm in April 2003. The most recent earthquake activity has been regularly felt by residents in villages on all flanks of the complex. In Dec 09/Jan10, scientists from the Seismic Research Centre (SRC), based in Trinidad & Tobago, in collaboration with staff of the Office of Disaster Management (ODM) and Dominica Public Seismic Network (DPSN) improved the monitoring capacity around this volcano from 1 to 7 seismic stations. Earthquakes are determined to be volcano-tectonic in nature and located at shallow depths (<4 km) beneath the central depression. Additionally, in Jan/Feb 10 geothermal sampling was undertaken and 2 permanent GPS sites were deployed. Public information leaflets prepared by SRC scientists using a "Question & Answer" format have been distributed to concerned citizens whilst many public meetings were carried out by ODM staff. Field investigations indicate that the previous Late Pleistocene activity of Morne Aux Diables switched from Pelèan dome growth and gravitational collapse to more explosive pumice-falls and associated ignimbrites, both styles forming extensive pyroclastic fans around the central complex. The town of Portsmouth is located on one of these fans ~5 km southwest of the central depression. Sporadic, short bursts of seismic activity continue at the time of writing.

Watts, R. B.; Robertson, R. E.; Abraham, W.; Cole, P.; de Roche, T.; Edwards, S.; Higgins, M.; Johnson, M.; Joseph, E. P.; Latchman, J.; Lynch, L.; Nath, N.; Ramsingh, C.; Stewart, R. C.

2012-12-01

282

Low-temperature thermoelectric, galvanomagnetic, and thermodynamic properties of the type-I clathrate Ba8AuxSi46-x  

NASA Astrophysics Data System (ADS)

Polycrystalline samples of the clathrate Ba8AuxSi46-x were synthesized for 0.2 ? x ? 10. The homogeneity range of the type-I clathrate phase was determined to be 3.63 ? x ? 6.10 after annealing at 900 °C, while a lower Au concentration (x ? 2.2) was obtained by steel-quenching. Quasisingle phase materials were obtained for 4.10 ? x ? 6.10. In this composition range, thermoelectric properties, including electrical resistivity, thermopower, and thermal conductivity, were investigated between 2 and 350 K. These experiments were complemented by low-temperature specific heat and Hall-effect measurements (2-300 K). First-principles calculations were carried out to determine the evolution of the electronic structure as a function of x. Both theoretical and experimental results evidence a progressive evolution, with the Au content, from a metallic-like behavior towards a highly doped semiconducting state which develops around x = 5.43. At this concentration, a crossover from n- to p-type conduction occurs, suggesting that the present system satisfies the Zintl-Klemm concept, which predicts a transition at x = 5.33. This crossover is traced by Hall-effect data indicating a dominant electronlike response for x ? 5.43, which turns into a holelike signal at higher x values. Analysis of the data based on a single-parabolic-band model under the assumption of a single scattering mechanism of the charge carriers proved to adequately describe the transport properties in the compositional range investigated. Interestingly, the temperature dependence of the lattice thermal conductivity is strongly influenced by the Au concentration: the typical behavior of crystalline insulators in the n-type compounds evolves into a glasslike dependence in the p-type samples. The series Ba8AuxSi46-x thus provides an excellent testing ground for the interplay between crystal structure, electronic properties, and lattice thermal conductivity in type-I clathrates.

Aydemir, U.; Candolfi, C.; Ormeci, A.; Oztan, Y.; Baitinger, M.; Oeschler, N.; Steglich, F.; Grin, Yu.

2011-11-01

283

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

284

PEOPLE IN PHYSICS: Interview with Peter Higgs  

NASA Astrophysics Data System (ADS)

Peter Higgs, FRSE, FRS held until recently a personal chair in theoretical physics at the University of Edinburgh and is now an emeritus professor. Peter is well known for predicting the existence of a new particle, the Higgs boson - as yet unconfirmed. He has been awarded a number of prizes in recognition of his work, most recently the Paul Dirac Medal and Prize for outstanding contributions to theoretical physics from the Institute of Physics and the 1997 High Energy and Particle Physics Prize by the European Physical Society.

Fancey, Conducted by Norman

1998-01-01

285

Linear electronic transport in dense plasmas. II. Finite degeneracy contributions  

NASA Astrophysics Data System (ADS)

The formalism described in the first paper in this series is hereafter specialized to a thorough investigation of finite degeneracy contributions to thermoelectronic and mechanical transport coefficients, conveniently expressed as reduced quantities. Temperature corrections are systematically discussed through the analytical properties of the jellium dielectric function. The Thomas-Fermi one appears as a paradigm of regular behavior at q=2k_F while the Lindhard and its T-dependent extension head a singular class characterized by diverging derivatives. Specific methods are developed for these important cases. Results are presented in terms of analytic expansions in the degeneracy parameter ?, and exact expressions for the above-mentioned corrections are derived up to order ?2. Finally we display a number of numerical results pertaining to fully ionized proton-helium binary mixtures of Astrophysical interest. The connection of the present formalism and its numerical outputs with other previous treatments is also carefully examined. Le formalisme exposé et détaillé dans le premier article de cette série est ici appliqué à la détermination des contributions de dégénérescence partielle aux coefficients de transport thermoélectroniques et mécanique (viscosité), coefficients préalablement exprimés sous forme d'expressions réduites. Les corrections de température finie sont systématiquement analysées en relation avec les propriétés analytiques de la fonction diélectrique du jellium. Alors que celle de Thomas-Fermi fournit l'exemple type de fonction parfaitement régulière en q=2k_F, celle de Lindhard et sa généralisation à T finie sont au contraire caractérisées par des dérivées divergentes en ce point. Des méthodes spécifiques sont développées pour traiter correctement ces cas importants. Nos résultats sont présentés sous forme de développements analytiques en puissance du paramètre de dégénérescence ?, et des expressions exactes pour les corrections mentionnées sont dérivées jusqu'à l'odre ?2. Leur traduction numérique est finalement appliquée au cas des mélanges binaires proton-helium complètement ionisés, d'intérêt Astrophysique. Le lien entre le présent formalisme, et notamment ses implications numériques, et d'autres résultats antérieurs, fait aussi l'objet d'un examen attentif.

Léger, D.; Deutsch, C.

1991-06-01

286

The Other Hall Effect: College Board Physics  

ERIC Educational Resources Information Center

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…

Sheppard, Keith; Gunning, Amanda M.

2013-01-01

287

Eight Hundred Years of Physics Teaching.  

ERIC Educational Resources Information Center

This book uses a biographical pattern to trace the history of physics teaching. Whenever possible the story of an influential person or institution is used to tell the story of that period. The book begins with the contributions of the Greeks, the Romans, and the Arabs to physics and its teaching. Chapters include: (1) "The First Beginnings of…

Bishop, George

288

The representation of facts in physical theories  

Microsoft Academic Search

The purpose of this contribution is to call attention to a problem which has not received the interest which, in my opinion, it deserves: the problem of representation of facts in physical theories. The crucial point is, that within the framework of fundamental physical theories, the representation of facts requires a breaking of the time-reversal symmetry and nonanticipative measuring instruments.

Hans Primas

289

Mobile system to motivate teenagers' physical activity  

Microsoft Academic Search

This paper reports a mobile persuasive application to motivate teenagers to start and continue being physically active. Being physically active can lead to reduced risks of having weight and cardiovascular problems; however efforts in this direction had variable success. Designing technology that will be engaging and motivating for teenagers requires an understanding of the factors that contribute to behavior adoption

Sonia M. Arteaga; Mo Kudeki; Adrienne Woodworth; Sri Kurniawan

2010-01-01

290

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

291

Solar Physics - Plasma Physics Workshop  

NASA Technical Reports Server (NTRS)

A summary of the proceedings of a conference whose purpose was to explore plasma physics problems which arise in the study of solar physics is provided. Sessions were concerned with specific questions including the following: (1) whether the solar plasma is thermal or non-themal; (2) what spectroscopic data is required; (3) what types of magnetic field structures exist; (4) whether magnetohydrodynamic instabilities occur; (5) whether resistive or non-magnetohydrodynamic instabilities occur; (6) what mechanisms of particle acceleration have been proposed; and (7) what information is available concerning shock waves. Very few questions were answered categorically but, for each question, there was discussion concerning the observational evidence, theoretical analyses, and existing or potential laboratory and numerical experiments.

Baum, P. J.; Beckers, J. M.; Newman, C. E.; Priest, E. R.; Rosenberg, H.; Smith, D. F.; Sturrock, P. A.; Wentzel, D. G.

1974-01-01

292

The origins of medical physics.  

PubMed

The historical origins of medical physics are traced from the first use of weighing as a means of monitoring health by Sanctorius in the early seventeenth century to the emergence of radiology, phototherapy and electrotherapy at the end of the nineteenth century. The origins of biomechanics, due to Borelli, and of medical electricity following Musschenbroek's report of the Leyden Jar, are included. Medical physics emerged as a separate academic discipline in France at the time of the Revolution, with Jean Hallé as its first professor. Physiological physics flowered in Germany during the mid-nineteenth century, led by the work of Adolf Fick. The introduction of the term medical physics into English by Neil Arnott failed to accelerate its acceptance in Britain or the USA. Contributions from Newton, Euler, Bernoulli, Nollet, Matteucci, Pelletan, Gavarret, d'Arsonval, Finsen, Röntgen and others are noted. There are many origins of medical physics, stemming from the many intersections between physics and medicine. Overall, the early nineteenth-century definition of medical physics still holds today: 'Physics applied to the knowledge of the human body, to its preservation and to the cure of its illnesses'. PMID:24709572

Duck, Francis A

2014-06-01

293

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.

294

75 FR 34388 - Employee Contribution Elections and Contribution Allocations  

Federal Register 2010, 2011, 2012, 2013

...pay and contributed to the TSP on the employee's behalf if the employee does not make an affirmative election; (b) The employee's right to elect to not have default employee contributions made to the TSP on his or her behalf or to elect...

2010-06-17

295

Flipped physics  

NASA Astrophysics Data System (ADS)

This paper defines flipped learning and then examines its practical implementation in AS and A2 level physics classes, that is, classes for 16-18 year olds. The effect of this teaching style on student learning behaviour and its impact on test results are evaluated. The paper recounts the difficulties of implementing it and evaluates student preferences. It concludes with comments about this teaching style’s appropriateness for various groups of students and identifies those for whom it is not suitable. A list of useful websites is included.

Kettle, Maria

2013-09-01

296

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

297

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

298

Physical Activity for Everyone  

MedlinePLUS

... Physical Activity Physical Activity Share Compartir How much physical activity do you need? Regular physical activity helps improve ... activities each week. It's easier than you think! Physical Activity Guidelines Children 6 to 17 years of age ...

299

Conception et test d'un circuit integre (ASIC): application aux chambres multifils et aux photomultiplicateurs de l'experience GRAAL. (Conception and test of an integrated circuit (ASIC): application to multiwire chambers and photomultipliers of the GRAAL experience).  

National Technical Information Service (NTIS)

The nuclear physics project GRAAL (GRenoble Anneau Accelerateur Laser) located at the European Synchrotron Radiation Facility (ESRF) in Grenoble produces a high energy photon beam with a maximum energy of 1.5 GeV. This gamma beam is obtained by Compton ba...

H. Bugnet

1995-01-01

300

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

301

New physics and the unitarity triangle  

NASA Astrophysics Data System (ADS)

After reviewing the present experimental constraints on the unitarity triangle, I discuss the various ways in which new physics can manifest itself in measurements of the parameters of the unitarity triangle. Apart from one exception, which I describe, new physics enters principally through new contributions to B0-B0 mixing. Different models of new physics can be partially distinguished by looking at their effects on rare, flavour-changing B penguin decays.

London, David

1998-02-01

302

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

303

Hillslope versus riparian zone runoff contributions in headwater catchments: A multi-watershed comparison  

Microsoft Academic Search

It is often assumed that hillslope and riparian areas constitute the two most important and identifiable landscape units contributing to catchment runoff in upland humid catchments. Nevertheless, the relative amount and timing of hillslope versus riparian contributions to stormflow are poorly understood across different watersheds. We quantified the contributions of hillslopes and riparian zones to stormflow using physical, chemical, and

B. L. McGlynn; J. J. McDonnell; R. P. Hooper; J. B. Shanley; K. N. Hjerdt

2001-01-01

304

SPS Internship: Working With Physics To Go  

NASA Astrophysics Data System (ADS)

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 the site this summer consisted of obtaining useful materials to add to the collection and working to update the homepage's ``mini-magazine'' every two weeks. I was selected for this position at APS by the Society of Physics Students (SPS) summer internship program, hosted by the American Institute of Physics (AIP) in College Park, MD. This internship is presented to a number of physics undergraduates each year and offers opportunities in research and science policy/outreach positions at SPS, APS, AAPT, NASA, and NIST.

Hancock, Logan

2008-10-01

305

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

306

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

307

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

308

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

309

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

310

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

311

Factors contributing to hypoxia in rivers, lakes, and streams  

Microsoft Academic Search

We investigated physical, chemical, and biological variables contributing to biochemical oxygen demand (BOD) in 17 North Carolina lotic and lentic water bodies affected by mild to severe hypoxia. Phytoplankton production created the dominant reservoir of labile carbon driving BOD, and subsequent hypoxia, in a Piedmont river subject to algal blooms, three urban streams, a set of anthropogenically affected tidal creeks,

Michael A. Mallin; Virginia L. Johnson; Scott H. Ensign; Tara A. MacPherson

2006-01-01

312

Physical Fitness and Adapted Physical Education.  

ERIC Educational Resources Information Center

The author contends that physical fitness through adapted physical education allows handicapped students to successfully participate in sports and independent recreational activities in the community. (SB)

Auxter, David

1982-01-01

313

Physical Oceanography (Program Description)  

NSF Publications Database

... of Ocean Sciences Physical Oceanography Description The Physical Oceanography Program supports ... various quantities, with the way the ocean's physical structure interacts with the biological and ...

314

The Influence of Accelerator Science on Physics Research  

SciTech Connect

We evaluate accelerator science in the context of its contributions to the physics community. We address the problem of quantifying these contributions and present a scheme for a numerical evaluation of them. We show by using a statistical sample of important developments in modern physics that accelerator science has influenced 28% of post-1938 physicists and also 28% of post-1938 physics research. We also examine how the influence of accelerator science has evolved over time, and show that on average it has contributed to a physics Nobel Prize-winning research every 2.9 years.

Haussecker, Enzo F.; /SLAC /UC, San Diego; Chao, Alexander W.; /SLAC

2012-05-08

315

Megagauss physics.  

PubMed

Fields greater than 10 MG can be produced by explosive flux compression and fields up to 3 MG with capacitor banks. Measurement of fields up to 10 MG is reliable, but difficulties may be expected at higher fields. Megagauss fields have been applied successfully as high-pressure sources, in high-energy particle physics, and in solid-state investigations. Other uses remain to be exploited: plasma compression by megagauss fields has been relatively unsuccessful but shows promise; their use as particle accelerators has been studied only theoretically; and much work remains to be done, both experimentally and theoretically, in connection with applications of megagauss fields in solidstate physics. Note added in proof: Since this article was prepared, Grigor'ev et al. have carried out some experiments (48) in which they have compressed hydrogen up to a density of 1.95 grams per cubic centimeter with a calculated pressure of 8 x 10(6) atmospheres. They report five different pressure-density points and claim that their data can be explained by assuming that the transition to the metallic phase occurs at a pressure of 2.8 x 10(6) atmospheres, with a density change from 1.08 to 1.3 g/cm(3). Using the flux compression techniques described earlier in this article, Hawke et al. [see (30, 31)] have obtained a pressure-density point at 1.5 x 10(6) atmospheres and 1.0 g/cm(3), which is also not inconsistent with a predicted equation of state of metallic hydrogen (49). In view of the experimental uncertainties, none of the pressure-density data can yet be used conclusively to establish the transition's existence. Hawke and his co-workers are presently engaged in measurements of the electrical conductivity of the compressed hydrogen. Observation of a significant conductivity at the proposed transition pressure would be a more definitive test of a metallic transition. In addition, two lower pressure-density points have been obtained for deuterium by the Los Alamos group, by means of the flux compression methods described earlier in this article. One point agrees to within experimental error with a slight extrapolation of Stewart's data (50). The second point is at a pressure of 65+/- 3 x 10(3) atmospheres with a density of 0.71 +/- 0.10 g/cm(3). The data are tentative, and efforts are under way to obtain more data points at both higher and lower pressures. PMID:17816281

Fowler, C M

1973-04-20

316

Travailleurs âgés, nouvelles technologies et changements organisationnels : un réexamen à partir de l'enquête « Reponse ». Suivi d'un commentaire de Luc Behaghel : emploi des seniors - Des effets du changement technologique aux recommandations  

Microsoft Academic Search

[fre] L'adoption par les entreprises d'innovations technologiques (micro-ordinateur, internet), de changements organisationnels ou leur ouverture au marché international posent la question de l'adaptation des travailleurs âgés (seniors) : les entreprises concernées évincent-elles plus souvent ou non les seniors de leur main-d'oeuvre ? L'analyse du stock d'emploi en 1998 confirme l'hypothèse d'un biais de ces changements défavorable aux seniors. Dans l'industrie

Patrick Aubert; Luc Behaghel; Sévane Ananian

2006-01-01

317

Scattering processes in atomic physics, nuclear physics, and cosmology  

NASA Astrophysics Data System (ADS)

The universal way to probe a physical system is to scatter a particle or radiation off the system. The results of the scattering are governed by the interaction Hamiltonian of the physical system and scattered probe. An object of the investigation can be a hydrogen atom immersed in a laser field, heavy nucleus exposed to a flux of neutrons, or space-time metric perturbed by the stress-energy tensor of neutrino flux in the early Universe. This universality of scattering process designates the Scattering Matrix, defined as the unitary matrix of the overlapping in and out collision states, as the central tool in theoretical physics. In this Thesis we present our results in atomic physics, nuclear physics, and cosmology. In these branches of theoretical physics the key element that unifies all of them is the scattering matrix. Additionally, within the scope of Thesis we present underlying ideas responsible for the unification of various physical systems. Within atomic physics problems, namely the axial anomaly contribution to parity nonconservation in atoms, and two-photon resonant transition in a hydrogen atom, it was the scattering matrix which led to the Landau-Yang theorem, playing the central role in these problems. In scattering problems of cosmology and quantum optics we developed and implemented mathematical tools that allowed us to get a new point of view on the subject. Finally, in nuclear physics we were able to take advantage of the target complexity in the process of neutron scattering which led to the formulation of a new resonance width distribution for an open quantum system.

Shchedrin, Gavriil

318

Contributive Research Program of AFWAL.  

National Technical Information Service (NTIS)

A description of the work performed under the Contributive Research Program of AFWAL is presented. The scope and objectives of each individual task is reported. The work reported consisted of a wide range of individual tasks involving theoretical studies,...

R. C. Darrah

1983-01-01

319

Tesla's contribution to radiowave propagation  

Microsoft Academic Search

We review Nikola Tesla's contribution to radiowave propagation and wireless power transmission. Tesla's patents, published and unpublished notes about radiowave propagation and wireless power transmission are less known, and if known to some extent, they are usually wrongly interpreted

Aleksandar Marincic; Djuradj Budimir

2001-01-01

320

Physics-10  

NASA Astrophysics Data System (ADS)

The textbook is designated for the 10-th class of real and humanitarian lyceums, according the curriculum of the Ministry of Education of the Republic of Moldova for lyceums. It encomprises mechanics in 5 chapters (Kynematics (Trajectory, Relativity of the Motion, Circular Motion and other); Dynamics and the Forces in Nature (The mass and Force, Universal attraction, Elastic Forces, Friction, The motion of the Bodies under the action of many forces, The relativity Principle of Galilei and other); Statics; Mechanical Impuls and its conservation; Mechanical work and Mechanical Energy and its conservation( Mechanical work and Power, Kynetic Energy, The mechanical work of the Elastic Force, The conservation laws) and Molecular Physics and Thermdynamics in 5 chapters (The structure of the Matter; Gases and their properties (Simplest transformations, The molecular-kynetic theory, Real gases) ; Solids and Liquids (The Hook's law, Superficial tension, Dilatation and other); Phase transitions (including sublimation); (Calorimetry; Thermal machines; The second law of thermodynamics and other). The textbook includes also 8 laboratory (experimental) works, a number of questions for control and a number of 300 problems, half of which have answers. Short biographies of about 15 physicists are included. The textbook is illustrated with diagrames, paintings and portrets in black and white.

Marinciuc, Mihai; Rusu, Spiridon

321

DET/MPS - THE GSFC ENERGY BALANCE PROGRAM, DIRECT ENERGY TRANSFER/MULTIMISSION SPACECRAFT MODULAR POWER SYSTEM (MACINTOSH A/UX VERSION)  

NASA Technical Reports Server (NTRS)

The DET/MPS programs model and simulate the Direct Energy Transfer and Multimission Spacecraft Modular Power System in order to aid both in design and in analysis of orbital energy balance. Typically, the DET power system has the solar array directly to the spacecraft bus, and the central building block of MPS is the Standard Power Regulator Unit. DET/MPS allows a minute-by-minute simulation of the power system's performance as it responds to various orbital parameters, focusing its output on solar array output and battery characteristics. While this package is limited in terms of orbital mechanics, it is sufficient to calculate eclipse and solar array data for circular or non-circular orbits. DET/MPS can be adjusted to run one or sequential orbits up to about one week, simulated time. These programs have been used on a variety of Goddard Space Flight Center spacecraft projects. DET/MPS is written in FORTRAN 77 with some VAX-type extensions. Any FORTRAN 77 compiler that includes VAX extensions should be able to compile and run the program with little or no modifications. The compiler must at least support free-form (or tab-delineated) source format and 'do do-while end-do' control structures. DET/MPS is available for three platforms: GSC-13374, for DEC VAX series computers running VMS, is available in DEC VAX Backup format on a 9-track 1600 BPI tape (standard distribution) or TK50 tape cartridge; GSC-13443, for UNIX-based computers, is available on a .25 inch streaming magnetic tape cartridge in UNIX tar format; and GSC-13444, for Macintosh computers running AU/X with either the NKR FORTRAN or AbSoft MacFORTRAN II compilers, is available on a 3.5 inch 800K Macintosh format diskette. Source code and test data are supplied. The UNIX version of DET requires 90K of main memory for execution. DET/MPS was developed in 1990. A/UX and Macintosh are registered trademarks of Apple Computer, Inc. VMS, DEC VAX and TK50 are trademarks of Digital Equipment Corporation. UNIX is a registered trademark of AT&T Bell Laboratories.

Jagielski, J. M.

1994-01-01

322

Physics of Forced Unsteady Separation  

NASA Technical Reports Server (NTRS)

This report contains the proceedings of a workshop held at NASA Ames Research Center in April 1990. This workshop was jointly organized by NASA, the Air Force Office of Scientific Research (AFOSR), and the Army Research Office (ARO), and was directed toward improved understanding of the physical processes that cause unsteady separation to occur. The proceedings contain the written contributions for the workshop, and include selected viewgraphs used in the various presentations.

Carr, Lawrence W. (editor)

1992-01-01

323

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

324

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

325

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

326

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

327

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 I ...

328

Ukrainian Physics Journal.  

National Technical Information Service (NTIS)

A cover-to-cover translation is provided for Vol. 17, No.3, March 1972, of Ukrainskii Fizicheskii Zhurnal. Papers on solid state physics, elementary particle physics, plasma physics, and nuclear physics are included.

V. E. Lashkarev

1979-01-01

329

Medical Physics Data Book.  

National Technical Information Service (NTIS)

The Medical Physics Data Book is a collection of physical and chemical data useful in medical physics. The information has been extracted from other published sources. The handbook is divided into five sections: General Physics, Nuclear Medicine, Diagnost...

T. N. Padikal S. P. Fivozinsky

1982-01-01

330

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

331

Teaching Physics with the Physics Suite  

NSDL National Science Digital Library

This book provides a brief introduction to the implications of Physics Education Research for physics instruction and can be used as a handbook for improving physics teaching. The author reviews the cognitive basis for the current instructional concensus in PER and discusses a dozen popular active-engagement teaching methods and many various methods and tools to improve physics instruction.

Redish, Edward F.

2008-07-21

332

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

333

Enrollment in Physical Education Is Associated with Overall Physical Activity in Adolescent Girls  

ERIC Educational Resources Information Center

Little is known about population-level contributions of school physical education to overall physical activity (PA) in youth. Because PA levels are lower in girls than boys, it is particularly important that the effects of PE programs in adolescent girls be understood. Thus, the purpose of this study was to determine the association of enrollment…

Pate, Russell R.; Ward, Dianne S.; O'Neill, Jennifer R.; Dowda, Marsha

2007-01-01

334

Open Source Physics  

NSDL National Science Digital Library

The Open Source Physics Project creates and distributes curricular material for physics education and computational physics. Compiled programs, curricular materials, a modeling environment, Java code libraries, and data analysis tools are included. The learning resources include interactive explorations, conceptual and analytic exercises, and tutorials. Open Source Physics projects include curriculum for computational physics and statistical physics, video analysis software, and upper division physics courses. Open Source Physics is supported by the National Science Foundation.

2006-03-03

335

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

336

Effect of Children's Perceived Rejection on Physical Aggression  

ERIC Educational Resources Information Center

This study investigated whether the perception of self as socially rejected might contribute to increased physical aggression among elementary-school children. It was hypothesized that physically aggressive children would become more physically aggressive over time if they perceived that they were rejected and tended to blame peers for social…

Guerra, Vito S.; Asher, Steven R.; DeRosier, Melissa E.

2004-01-01

337

Generation d'impulsions breves utilisant la non-linearite associee aux porteurs de charge libres dans des semi-conducteurs  

NASA Astrophysics Data System (ADS)

Dans cette these, nous utilisons la non-linearite associee aux porteurs de charge libres generes par absorption multi-photonique dans des semi-conducteurs pour produire des impulsions breves dans l'infrarouge moyen. Nous proposons d'abord la methode de generation par suppression de la transmission et auto-defocalisation, ou le faisceau incident a l'angle de Brewster genere les porteurs de charge libres, creant un profil d'indice qui defocalise le faisceau. L'impulsion resultante presente un temps de montee calque sur l'impulsion initiale, suivie d'une coupure abrupte. En polarisation TE, on obtient le decoupage par effet d'etalon ou le faisceau est incident sur un etalon oriente sur un minimum de transmission; le debut de l'impulsion est reflechi. Le changement d'indice accompagnant la creation de porteurs de charge libres syntonise la transmission de l'etalon et seule la partie centrale de l'impulsion est transmise. Enfin, le decoupage peut aussi s'effectuer en configuration pompe-sonde; un faisceau continu (sonde) est incident sur un etalon simultanement soumis a l'illumination d'une d'impulsion breve (pompe). Cette derniere genere des porteurs de charge libres, conduisant a un glissement de la frequence instantanee de la sonde. Le faisceau est envoye dans un filtre spectral qui ne transmet que la portion ayant subi un important glissement de frequence.

Richard, Isabelle

338

The auxin influx carriers AUX1 and LAX3 are involved in auxin-ethylene interactions during apical hook development in Arabidopsis thaliana seedlings.  

PubMed

Dark-grown dicotyledonous seedlings form a hook-like structure at the top of the hypocotyl, which is controlled by the hormones auxin and ethylene. Hook formation is dependent on an auxin signal gradient, whereas hook exaggeration is part of the triple response provoked by ethylene in dark-grown Arabidopsis seedlings. Several other hormones and light are also known to be involved in hook development, but the molecular mechanisms that lead to the initial installation of an auxin gradient are still poorly understood. In this study, we aimed to unravel the cross-talk between auxin and ethylene in the apical hook. Auxin measurements, the expression pattern of the auxin reporter DR5::GUS and the localization of auxin biosynthesis enzymes and influx carriers collectively indicate the necessity for auxin biosynthesis and efficient auxin translocation from the cotyledons and meristem into the hypocotyl in order to support proper hook development. Auxin accumulation in the meristem and cotyledons and in the hypocotyl is increased approximately 2-fold upon treatment with ethylene. In addition, a strong ethylene signal leads to enhanced auxin biosynthesis at the inner side of the hook. Finally, mutant analysis demonstrates that the auxin influx carrier LAX3 is indispensable for proper hook formation, whereas the auxin influx carrier AUX1 is involved in the hook exaggeration phenotype induced by ethylene. PMID:20110325

Vandenbussche, Filip; Petrásek, Jan; Zádníková, Petra; Hoyerová, Klára; Pesek, Bedrich; Raz, Vered; Swarup, Ranjan; Bennett, Malcolm; Zazímalová, Eva; Benková, Eva; Van Der Straeten, Dominique

2010-02-01

339

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

340

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

341

The Physics Classroom: Shockwave Physics Studios  

NSDL National Science Digital Library

This collection by features interactive Shockwave activities that simulate a variety of physical situations. Students manipulate variables and observe the outcome on the physical system being modeled. Topics include graphing motion, free body diagrams, projectile motion, uniform circular motion, gravitation, orbital motion, time dilation, wave patterns, light refraction, lenses, and more. This resource is part of The Physics Classroom web site, a growing collection of resources for teachers and learners of introductory physics.

Henderson, Tom

2011-04-18

342

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

343

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

344

Physics Virtual Bookshelf  

NSDL National Science Digital Library

The Physics Virtual Bookshelf is a collection of documents written by professors as class notes or physics education research. This collection includes content on classical physics, computational physics, data analysis, modern physics, relativity, quantum mechanics, and pedagogy. The collection is organized by topic and easily browsed.

Bailey, David; Key, Anthony W.; Logan, Robert K.; Drummond, James R.; Sinervo, Pekka K.; Orr, Robert S.

2005-10-24

345

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.

346

Physics First? Survey First!  

ERIC Educational Resources Information Center

The idea of teaching physics to ninth-graders, known as "Physics First," has become more and more popular among physics educators in this country. However, introducing ninth-grade physics has been an uphill battle; such a change has a major impact on the students, parents, teachers, and the school administration. Switching to Physics First affects…

Korsunsky, Boris; Agar, Ozymandias

2008-01-01

347

The Physics Zone  

NSDL National Science Digital Library

The Physics Zone offers lessons and tutorials for learning introductory level, algebra and trigonometry-based physics. General physics topics include motion (projectile motion), forces (rotation, torque, and others), work and energy, and momentum. Other topics include electricity and magnetism; waves, light, and sound; 'modern' physics (the atom, the Standard Model of matter, spectroscopy, and others), and nuclear physics.

348

Physics Virtual Bookshelf  

NSDL National Science Digital Library

The Physics Virtual Bookshelf is a collection of documents written by professors as class notes or physics education research. This collection includes content on classical physics, computational physics, data analysis, modern physics, relativity, quantum mechanics, and pedagogy. The collection is organized by topic and easily browsed. The site is viewable as a standard Web page (default) or in Adobe Flash format.

Harrison, David M.

2009-06-18

349

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

350

Communities of on-line physics educators  

NASA Astrophysics Data System (ADS)

I briefly describe the nature, content, scope, history, and culture of PHYS-L and related electronic mailing lists dedicated to the teaching and learning of physics (including PHYSHARE, TAP-L and PhysLrnR). I also describe etiquette and writing guidelines for contributing to discussions on mailing lists. Finally, I review technical guidelines for controlling physics list subscriptions and related archive software.

MacIsaac, Dan

2000-04-01

351

Introductory physics in biological context: An approach to improve introductory physics for life science students  

NASA Astrophysics Data System (ADS)

We describe restructuring the introductory physics for life science students (IPLS) course to better support these students in using physics to understand their chosen fields. Our courses teach physics using biologically rich contexts. Specifically, we use examples in which fundamental physics contributes significantly to understanding a biological system to make explicit the value of physics to the life sciences. This requires selecting the course content to reflect the topics most relevant to biology while maintaining the fundamental disciplinary structure of physics. In addition to stressing the importance of the fundamental principles of physics, an important goal is developing students' quantitative and problem solving skills. Our guiding pedagogical framework is the cognitive apprenticeship model, in which learning occurs most effectively when students can articulate why what they are learning matters to them. In this article, we describe our courses, summarize initial assessment data, and identify needs for future research.

Crouch, Catherine H.; Heller, Kenneth

2014-05-01

352

A contribution Monte Carlo method  

SciTech Connect

A Contribution Monte Carlo method is developed and successfully applied to a sample deep-penetration shielding problem. The random walk is simulated in most of its parts as in conventional Monte Carlo methods. The probability density functions (pdf's) are expressed in terms of spherical harmonics and are continuous functions in direction cosine and azimuthal angle variables as well as in position coordinates; the energy is discretized in the multigroup approximation. The transport pdf is an unusual exponential kernel strongly dependent on the incident and emergent directions and energies and on the position of the collision site. The method produces the same results obtained with the deterministic method with a very small standard deviation, with as little as 1,000 Contribution particles in both analog and nonabsorption biasing modes and with only a few minutes CPU time.

Aboughantous, C.H. (Louisiana State Univ., Baton Rouge, LA (United States). Nuclear Science Center)

1994-11-01

353

Physics in NASA Exploration  

NASA Technical Reports Server (NTRS)

The primary focus of the workshop was NASA's new concentration on sending crewed missions to the Moon by 2020, and then on to Mars and beyond. Several speakers, including JPL s Fred O Callaghan and NASA's Mark Lee, broached the problem that there is now a serious reduction of capability to perform experiments in the ISS, or to fly significant mass in microgravity by other means. By 2010, the shuttle fleet will be discontinued and Russian craft will provide the only access to the ISS. O Callaghan stated that the Fundamental Physics budget is being reduced by 70%. LTMPF and LCAP are slated for termination. However, ground-based experiments are continuing to be funded at present, and it will be possible to compete for $80-90 million in new money from the Human Research Initiative (HRI). The new program thrust is for exploration, not fundamental physics. Fundamental, we were told by Lee, does not ring well in Washington these days. Investigators were advised to consider how their work can benefit missions to the Moon and Mars. Work such as that regarding atomic clocks is looked upon with favor, for example, because it is considered important to navigation and planetary GPS. Mark Lee stressed that physicists must convey to NASA senior management that they are able and willing to contribute to the new exploration research programs. The new mentality must be we deliver products, not do research. This program needs to be able to say that it is doing at least 50% exploration-related research. JPL s Ulf Israelsson discussed the implications to OBPR, which will deliver methods and technology to assure human health and performance in extraterrestrial settings. The enterprise will provide advanced life-support systems and technology that are reliable, capable, simpler, less massive, smaller, and energy-efficient, and it may offer other necessary expertise in areas such as low-gravity behavior. Like Dr. Lee, he stated that the focus must be on products, not research. While there is not yet a formal direction, he said, LTMPF and PARCS ISS flight projects are slated to terminate in October 2004. All flight investigations are being returned to ground programs and phased out by the end of FY07. Physics ground programs are intact for now, but to survive we must shift about 50% of research to supporting exploration. Basic research programs in other disciplines are being cancelled. Product lines will support human health, safety and life-support, including countermeasures against radiation and other hazards, as well as advances in time-keeping, navigation and communications technologies. Israelsson said that the new Fundamental Physics for Exploration Roadmap points to how fundamental physics research can and does support exploration. JPL will use the roadmap to argue for support for fundamental physics research under several codes. Nicholas Bigelow of the University of Rochester encouraged attendees not to become discouraged, but rather to embrace the opportunities presented by NASA's new direction.

O'Callaghan, Fred

2004-01-01

354

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

355

Contemporary American Physics Fiction.  

ERIC Educational Resources Information Center

Discusses the works by six contemporary American novelists that illustrate the current state of "physics fiction." The discussed examples of physics fiction ranged from the fluent and frequent inclusion of the casual, to the elaborate systems of physics metaphors. (GA)

Friedman, Alan J.

1979-01-01

356

Guide to Physical Activity  

MedlinePLUS

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

357

Facts about Physical Activity  

MedlinePLUS

... CDC.gov . Physical Activity Share Compartir Facts about Physical Activity Some Americans are getting enough, but too many ... Activity Guideline for aerobic activity than older adults. Physical activity and socioeconomic status Adults with more education are ...

358

Yale Physics Olympics, 1998.  

ERIC Educational Resources Information Center

Physics competitions for high school students focus on experimental measurements using fundamental physics principles. Reports on how Yale University's physics department organized a day-long event for approximately 100 high school students. (CCM)

Bouffard, Karen

1999-01-01

359

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

360

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

361

Transposition des processus membranaires biologiques aux traitements des effluents métallifères peu chargés. Conception et étude chimique d'une pompe ionique uranifère. Transport, contre-transport, couplage positif  

NASA Astrophysics Data System (ADS)

An ionic pump has been devided thanks to au “liquid-liquid" extraction-reextration where the extraction compartment and the reextraction compartment are put in contact with one another through the membrane composed of an mediator diluted in the kerosene. We have applied this process to the system: uranyle nitrate, nitric acid-phosphate tributyle, kerosene-sodium carbonate. Interesting performances have been realised for diluted solutions (100 ppm). The chemicals parameters has allowed to obtain the variables giving the extraction and reextraction efficiency optimum. A chemical modelisation has allowed to identify the extraction mechanism. The classical behaviour obtained in agitated surroundings has been found again. The membrane can work thanks to the “activation" by the solute of the carrier at one interface and to the “deactivation" at the other interface, both of these mechanisms of the active transport creating a real “ionic pumping". Une pompe ionique est mise au point grâce à une ensemble “extraction-réextraction" “liquide-liquide" où le compartiment extraction et le compartiment réextraction sont mis en contact par l'intermédiaire d'une membrane contenant un transporteur dilué dans le kérosène. Ce procédé est appliqué aux ions uranyles. Des rendements intéressants sont obtenus pour des solutions diluées (100 ppm). L'étude des variables a permis de déterminer des paramètres chimiques donnant des rendements d'extraction et de réextration optimum. Le comportement symétrique des deux compartiments montre que nous avons un transport, contre-transport, couplage positif. Une modélisation chimique a permis d'identifier les mécanismes d'extraction. Le comportement classique obtenu en milieu agité est retrouvé. La pompe peut fonctionner grâce à l'activation du transporteur par le cosoluté contenu dans le compartiment d'extraction et à la désactivation à la sortie de la membrane par le cosoluté contenu dans le compartiment réextraction créant un pompage ionique.

Hasaine-Sadi, F.; Benhassaine, A.; Ait-Amar, H.

1999-09-01

362

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

363

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

Microsoft Academic Search

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 sport, and help athletes interact with the environment more effectively.

Li Li

2012-01-01

364

Biogeochemical cycling of lignocellulosic carbon in marine and freshwater ecosystems: relative contributions of procaryotes and eucaryotes  

Microsoft Academic Search

The relative contributions of procaryotes and eucaryotes to the degradation of the lignin and polysaccharide components of lignocellulosic detritus in two marine and two freshwater wetland ecosystems were determined. Two independent methods - physical separation of bacteria from fungi and other eucaryotes by size fractionation, and antibiotic treatments - were used to estimate procaryotic and eucaryotic contributions to the degradation

RONALD BENNER; MARY ANN MORAN; ROBERT E. HODSON

1986-01-01

365

Parenting during toddlerhood: Contributions of parental, contextual, and child characteristics  

Microsoft Academic Search

The present study examines the contribution of parental, contextual, and child characteristics to parenting behavior during toddlerhood in 111 two-parent families with a 17-month-old son (M = 16.9 months, SD = 0.57). Parenting was conceptualized in terms of five dimensions: support, structure, positive discipline, psychological control, and physical punishment. In general, results indicate that the effects of parental, contextual, and

M. Verhoeven; M. Junger; Aken van C; M. Dekovi?; Aken van M. A. G

2007-01-01

366

Chronic Physical Illness: A Psychophysiological Approach for Chronic Physical Illness  

PubMed Central

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.

Purdy, Jana

2013-01-01

367

ASDEX upgrade results. Publications and conference contributions. Period 6/92 to 9/93.  

National Technical Information Service (NTIS)

The report contains the papers of IPP members contributed to the conferences as follows: 1. 29th EPS Conference on Controlled Fusion and Plasma Physics, Innsbruck, June 19-July 3, 1992; 2. 14th International Conference on Plasma Physics and Controlled Nuc...

1993-01-01

368

WHEN WEST MEETS EAST: CONTRIBUTIONS OF EASTERN TRADITIONS TO THE FUTURE OF PSYCHOTHERAPY  

Microsoft Academic Search

Traditional Eastern approaches to mental health have an important contribution to make to the future of Western psychotherapies. Common to these approaches is a recognition of the importance of the causal connection between mental and physical self-regulation and emotional and physical well being. The authors describe several applications of Eastern, and especially Japanese approaches to psychotherapy to a variety of

C. PETER BANKART; FUSAKO KOSHIKAWA; KANEO NEDATE; YUTAKA HARUKI

1992-01-01

369

NASA contributions to the National Climate Assessment  

NASA Astrophysics Data System (ADS)

NASA observations and models extensively contribute to our knowledge of climate change science, primarily at global scales, but increasingly at regional scales. This knowledge also advances our understanding of the impacts of climate change on natural and social systems, and can inform decisions about adaptation to current and anticipated changes. To enable the use of these scientific advances, NASA has supported the development of the 2013 National Climate Assessment (NCA) report in numerous ways and is also focusing on fostering the science and scientists that underpin a sustained assessment effort. Ultimately, NASA's objective is to contribute to the capacity for sustained assessments by funding the foundational science that underpins the NCA and by supporting the training of scientists who can participate in future assessments. Here, we outline NASA's general approach and strategy for the NCA and highlight several research activities. In 2011, the agency funded 14 projects at NASA research centers, supporting both the near-term 2013 NCA report and the sustained assessment process, to advance assessment science, develop capabilities and products for the assessment, and enhance the development of assessment-enabling tools. These projects include the development of a regional climate model evaluation system, an assessment of how climate has affected recent fire activity in the U.S., and an evaluation of how climate-driven heat events impact public health. Additionally, NASA sponsored two workshops in 2010 and 2011 to establish methodologies to identify physical and societal climate change indicators. Based on these activities and needs identified by the NCA, the agency is supporting the development of climate change indicators via a competitively funded grant opportunity that is open to the entire research community. NASA envisions continuing to leverage the agency's resources and scientific expertise to facilitate future NCAs and enhance the knowledge base that will enable the Nation to respond to climate change.

Leidner, A. K.; Lipschultz, F.; Friedl, L.; Kaye, J. A.

2012-12-01

370

Contributive factors to aviation accidents.  

PubMed

The objective of the study was to compare the results of aviation accident analyses performed by the Center for Investigation and Prevention of Aviation Accidents (CENIPA) with the method Human Factors Analysis and Classification System (HFACS). The final reports of thirty-six general aviation accidents occurring between 2000 and 2005 in the State of São Paulo, Southeastern Brazil were analyzed and compared. CENIPA reports mentioned 163 contributive factors, while HFACS identified 370 factors. It was concluded that CENIPA reports did not contemplate the organizational factors associated with aviation accidents. PMID:21344127

Fajer, Marcia; Almeida, Ildeberto Muniz de; Fischer, Frida Marina

2011-04-01

371

Contributions to Global Warming Map  

NSDL National Science Digital Library

This Web site comes from the World Resources Institute, "an environmental think tank that goes beyond research to find practical ways to protect the earth and improve people's lives." The site contains a map of the relative contribution of carbon dioxide emissions of different geographic areas, and is offered as part of WRI's Global Topics: Climate Change and Energy. The map, which depicts emissions from 1900-99 to reflect the estimated residence time of CO2 in the atmosphere, can be downloaded. The site also includes a table of the top CO2-producing countries and links to the data sources used to create the map.

372

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

373

Physics at COSY-Jülich  

NASA Astrophysics Data System (ADS)

COSY, a storage and cooler synchrotron, which is fed by an injector cyclotron, is operated at Forschungszentrum Jülich (Germany). It provides phase space cooled polarized or unpolarized beams of protons and deuterons with momenta between 0.3 and 3.7 GeV/c for internal experiments and to external target stations. The major experimental facilities, used for the ongoing physics program, are ANKE and WASA (internal) and TOF (external). A new internal target station to investigate polarization build-up by spin-filtering (PAX) has recently been commissioned. COSY is the machine for hadron spin physics on a world-wide scale, which is also used for tests in conjunction with plans to build a dedicated storage ring for electric dipole moment (EDM) measurements of proton, deuteron and 3He. In this contribution recent results as well as future plans are summarized.

Ströher, Hans

2011-10-01

374

On new physics in ?? d  

NASA Astrophysics Data System (ADS)

Motivated by the recent measurement of the dimuon asymmetry by the DØ collaboration, which could be interpreted as an enhanced decay rate difference in the neutral B d -meson system, we investigate the possible size of new-physics contributions to ?? d . In particular, we perform model-independent studies of non-standard effects associated to the dimension-six current-current operators ()(' b) with p, p' = u, c as well as ()(). In both cases we find that for certain flavour or Lorentz structures of the operators sizeable deviations of ?? d away from the Standard Model expectation cannot be excluded in a model-independent fashion.

Bobeth, Christoph; Haisch, Ulrich; Lenz, Alexander; Pecjak, Ben; Tetlalmatzi-Xolocotzi, Gilberto

2014-06-01

375

Neutrinos:. Windows to Planck Physics  

NASA Astrophysics Data System (ADS)

After recalling some elegant contributions of the late Freydoon Mansouri, we turn to neutrino physics and use a modicum of grand unification to relate quark and lepton mixing matrices. We advocate an expansion for the MNS matrix, à la Wolfenstein, and argue that in a wide class of models, ?13 is a Cabibbo mixing effect. Also the large neutrino mixing angles reflect the mass patterns of the right-handed neutrinos near the Planck scale, and provide evidence for family structure at that scale.

Ramond, P.

2004-10-01

376

Teaching Touch Rugby in Physical Education Classes  

ERIC Educational Resources Information Center

Physical educators are always looking for new ideas that introduce moderate-to-vigorous activity, involve skill, encourage teamwork, and increase student interest. Touch rugby has the potential to contribute to these outcomes. Though the sport is not new, it is not a mainstream sport. Therefore, students see it as something new. Their motivation…

Pugh, Steven F.; Alford, Alan

2004-01-01

377

America 2000: Implications for Physical Education.  

ERIC Educational Resources Information Center

Paper examines how physical education can contribute to and work proactively toward each of the six national education goals in America 2000: readiness to learn, national graduation rates, competency in five core subjects, world class achievement in science and mathematics, literacy, and a positive learning environment. (SM)

Sadler, Wendell C.

1993-01-01

378

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

379

PREFACE: Progress in the ITER Physics Basis  

Microsoft Academic Search

I would firstly like to congratulate all who have contributed to the preparation of the `Progress in the ITER Physics Basis' (PIPB) on its publication and express my deep appreciation of the hard work and commitment of the many scientists involved. With the signing of the ITER Joint Implementing Agreement in November 2006, the ITER Members have now established the

K. Ikeda

2007-01-01

380

International Symposium on Physical Sciences in Space  

Microsoft Academic Search

ISPS is the major international scientific forum for researchers in physics utilizing the space environment, in particular microgravity. It is intended to inspire and encourage cross-cutting discussions between different scientific communities working in the same environment. Contributions discussing results of experiments carried out on drop towers, parabolic aircraft flights, sounding rockets, unmanned recoverable capsules and, last but not least, the

Andreas Meyer; Ivan Egry

2011-01-01

381

Effective Teaching in Physical Education: Slovenian Perspective  

ERIC Educational Resources Information Center

Regular quality physical education (PE) contributes to the harmonized biopsychosocial development of a young person--to relaxation, neutralization of negative effects of sedentary hours, and other unhealthy habits/behaviors. The evaluation approach to PE effectiveness provides important information to PE teachers and also to students. However,…

Pišot, Rado; Plevnik, Matej; Štemberger, Vesna

2014-01-01

382

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

383

EBIT - Electronic Beam Ion Trap: N Division experimental physics annual report 1995.  

National Technical Information Service (NTIS)

The multi-faceted research effort of the EBIT (Electron Beam Ion Trap) program in N-Division of the Physics and Space Technology Department at Lawrence Livermore National Laboratory (LLNL) continues to contribute significant results to the physical scienc...

D. Schneider

1996-01-01

384

Global Physics Department  

NSDL National Science Digital Library

The Global Physics Department is an online community of physics educators using social media to explore topics in physics and physics education. The activities of the group includes weekly online discussions and asynchronous communications through blogs and twitter. Participation in these activities is free and open to all.

2012-11-03

385

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

386

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

387

Teaching Quantum Physics Conceptually  

Microsoft Academic Search

Although quantum physics and relativity have been our basis for understanding the universe for the past century, most introductory physics courses still nearly exclude them. This talk presents ways of teaching quantum physics conceptually, i.e. without algebra. Such an approach is appropriate not only for non-scientists but also as an introduction to quantum physics for scientists. Topics will include the

Art Hobson

2002-01-01

388

Physics For All -- yes, it's real physics  

NASA Astrophysics Data System (ADS)

Can ``all'' students learn ``real'' physics? We want to provide instruction to a wider segment of the population including those students who will not go into STEM (Science, Technology, Engineering, Math) careers. We also want to maintain the integrity of physics, challenge all students, and not compromise the rigor of our courses. Accomplishing this requires a research guided approach to instruction, curriculum and assessment. Physics First and Physics for All have become a success story for thousands of students in urban, suburban, and rural districts. At the same time, the International Physics Olympiad and other competitions have raised the expectation of what the most motivated students can achieve. Many physics educators are exploring ways to set higher goals for our most gifted students while also providing physics instruction to students previously excluded from our physics classes. Many of the same issues that K-12 educators are struggling with are equally important to the college community as colleges try to educate both future physicists and an educated citizenry. Great novels and symphonies are accessible to people of different backgrounds and levels of expertise. We should develop strategies that enable us to share an understanding of physics with all students because everyone deserves an opportunity to reflect on the wondrous workings of our universe.

Eisenkraft, Arthur

2012-02-01

389

Solar Physics with Radio Observations  

NASA Astrophysics Data System (ADS)

Radio observations contribute a unique perspective on the many physical phenomena, which occur on the Sun. From thermal bremsstrahlung emission in the quiet solar atmosphere and filaments, to thermal gyroresonance emission in strongly magnetized solar active regions, to the nonthermal emission from MeV electrons accelerated in flares, observations of radio emission provide a powerful probe of physical conditions on the Sun and provide an additional means of understanding the myriad phenomena which occur there. Moreover, radio observing techniques have led the way in developing and exploiting Fourier synthesis imaging techniques. The Nobeyama Radioheliograph, commissioned in June, 1992, soon after the launch of Yohkoh satellite in August, 1991, is the most powerful, solar-dedicated Fourier synthesis in the world, now capable of imaging the full disk of the Sun simultaneously at frequencies of 17 and 34 GHz, with an angular resolution as much as 10" and 5", respectively, and with a time resolution as fine as 100 msec. Between 27-30 October, 1998, the Nobeyama Radio Observatory and the National Astronomical Observatory of Japan hosted the Nobeyama Symposium on Solar Physics with Radio Observations, an international meeting bringing more than sixty participants together at the Seisenryo Hotel in Kiyosato, for a meeting devoted to reviewing recent progress in outstanding problems in solar physics. Emphasis was placed on radio observations and, in particular, radio observations from the very successful Nobeyama Radioheliograph. These results were compared and contrasted with those that have emerged from the Yohkoh mission. In addition, looking forward to the next solar maximum, new instruments, upgrades, and collaborative efforts were discussed. The result is the more than seventy invited and contributed papers that appear in this volume.

Bastian, T. S.; Gopalswamy, N.; Shibasaki, K.

1999-12-01

390

History and Evolution of Physics  

NSDL National Science Digital Library

This Topic in Depth explores the history and evolution of the field of physics. The first website, created by the Institute of Physics, offers an interactive timetable of the development of physics from the ancient philosophers during the Bronze Age to the present research in quantum mechanics and relativity (1). The website illustrates the links between scientists and eras. Second, the US Department of Energy provides a synopsis of the work of the nuclear physics research program and the high-energy physics program since the 1950s (2). Users can also discover current research highlights and papers. The third website features an excerpt from a biography of Josiah Willard Gibbs by a student of his, Lynde Phelps Wheeler (3). Along with a download of a paper discussing the history of thermodynamics, the website supplies a download of a paper Carnot wrote about power in 1824. Fourth, physicist Patricia Schwartz presents a brief timeline of the evolution of mathematics and theoretical physics since the Babylonians established the metric of flat, two-dimensional space (4 ). Students can find an additional timeline of string theory dating back to the Kaluza-Klein Theory in 1921. The fifth website, developed by Lawrence Berkeley National Laboratory, is a section of an X-ray data book exploring the history of synchrotron radiation (5). The website discusses numerous historical aspects include the development of storage rings and the optimization of these with lower emittance and long straight sections for undulators. Sixth, John Bahcall, at the Institute for Advanced Study, offers popular papers on the history of solar neutrinos (6). Anyone interested in learning about the research of solar neutrinos should visit this website. The seventh website is a pdf file of a paper written by the President of the Italian Physical Society, Renato Angelo Ricci, detailing the work of Enrico Fermi and his contributions to the field of nuclear physics (7). This paper can help users who have some prior knowledge of nuclear physics understand the greatness of Fermi's work. Lastly, the University of Oxford provides images of scientific instruments from the medieval and renaissance periods of Europe held at four museums in Europe (8). Students can learn about the uses of the instruments and their origin.

391

Physical Constraints on Seismic Waves from Chemical and Nuclear Explosions.  

National Technical Information Service (NTIS)

Quantification of physical processes near an explosion that contribute to the radiated seismic wavefield was the goal of this work. Characterization of both nuclear and chemical explosions using near-source observations was conducted. This report is divid...

B. Stump R. Reinke K. Olsen L. Johnson S. Reamer

1992-01-01

392

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

393

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

394

Obscuring Power Structures in the Physics Classroom: Implications for Student Engagement and Physics Identity Development  

NSDL National Science Digital Library

Many students are disempowered in physics classes finding them to be more difficult, unpleasant, narrow, and masculine when compared to other subjects. Such disempowerment can lead students to limit their engagement. This study explores how physics teachers can help students engage with the material and develop their physics identities by obscuring traditional classroom hierarchies. Employing a positionality lens on case studies of four high school physics teachers, we coded teachersâ behavioral cues that contributed to the relational structure in the classroom. Our findings suggest that teachersâ physical cues (space and hierarchical stance occupied), structural cues (dynamic nature of the classroom allowing alternating roles), contextual cues (including studentsâ thoughts and experiences), and social cues (obscuring traditional boundaries between teacher and student) affect the social distance between the teacher, students, and content. This social distance can moderate studentsâ level of engagement and ultimately their physics identity development.

Hazari, Zahra; Lock, Robynne M.; Cass, Cheryl A.; Beattie, Carrie

2013-12-18

395

Statistical Contributions to Proteomic Research  

PubMed Central

Proteomic profiling has the potential to impact the diagnosis, prognosis, and treatment of various diseases. A number of different proteomic technologies are available that allow us to look at many proteins at once, and all of them yield complex data that raise significant quantitative challenges. Inadequate attention to these quantitative issues can prevent these studies from achieving their desired goals, and can even lead to invalid results. In this chapter, we describe various ways the involvement of statisticians or other quantitative scientists in the study team can contribute to the success of proteomic research, and we outline some of the key statistical principles that should guide the experimental design and analysis of such studies.

Morris, Jeffrey S.; Baggerly, Keith A.; Gutstein, Howard B.; Coombes, Kevin R.

2012-01-01

396

Students' Physical Growth: Developmental Framework, Physical Dimension.  

ERIC Educational Resources Information Center

Alberta Education's position on the physical growth of students is presented in this paper, which focuses on children's physical growth in the areas of perceptual, structural, and motor development. Each area is first discussed in terms of three age groups: the child from infancy to preschool, the elementary child, and the adolescent. Concluding…

Patterson, Donna; And Others

397

Training College Physics and Physical Science Teachers  

ERIC Educational Resources Information Center

Summarizes survey data about the need and appropriate character of graduate degree programs designed to prepare two-year and four-year college physics and physical science teachers. Indicates that future employment favors two-year college teachers with a master's degree in the region west of the Mississippi River. (CC)

Henderson, R. B.; And Others

1974-01-01

398

Nuclear winter - Physics and physical mechanisms  

NASA Technical Reports Server (NTRS)

The basic physics of the environmental perturbations caused by multiple nuclear detonations is explored, summarizing current knowledge of the possible physical, chemical, and biological impacts of nuclear war. Emphasis is given to the impact of the bomb-generated smoke (soot) particles. General classes of models that have been used to simulate nuclear winter are examined, using specific models as examples.

Turco, R. P.; Toon, O. B.; Pollack, J. B.; Ackerman, T. P.; Sagan, C.

1991-01-01

399

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

400

General Physics, Physics 12 [Science Curriculum Materials].  

ERIC Educational Resources Information Center

The Physics 12 curriculum guide represents one in a series of science guides especially designed to provide for the pupil whose primary interests are in non-science fields. The program provides study in physics in which fundamental concepts and understandings are developed, mathematical concepts are limited, and students are encouraged to relate…

Rochester City School District, NY.

401

Physics through the 1990s: Nuclear physics  

NASA Technical Reports Server (NTRS)

The volume begins with a non-mathematical introduction to nuclear physics. A description of the major advances in the field follows, with chapters on nuclear structure and dynamics, fundamental forces in the nucleus, and nuclei under extreme conditions of temperature, density, and spin. Impacts of nuclear physics on astrophysics and the scientific and societal benefits of nuclear physics are then discussed. Another section deals with scientific frontiers, describing research into the realm of the quark-gluon plasma; the changing description of nuclear matter, specifically the use of the quark model; and the implications of the standard model and grand unified theories of elementary-particle physics; and finishes with recommendations and priorities for nuclear physics research facilities, instrumentation, accelerators, theory, education, and data bases. Appended are a list of national accelerator facilities, a list of reviewers, a bibliography, and a glossary.

1986-01-01

402

Physics Matters: An Introduction to Conceptual Physics  

NASA Astrophysics Data System (ADS)

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 physics connect to form a much larger understanding of the universe in which we live. Highlights Helps readers build a general knowledge of key ideas in physics and their connection to technology and other areas of science. Promotes an appreciation of what science is, how scientific knowledge is developed, and how it differs from other intellectual activities. Examines modern technologies, including GPS, the Internet, and information technologies, as well as medical technologies, such as MRI, PET scans, CAT scans, and radioisotope tracers. Explores key issues facing the world today, such as global warning, nuclear waste, and government funding for research.

Trefil, James; Hazen, Robert M.

2003-12-01

403

The physical activity profile of active children in England  

PubMed Central

Background In line with WHO guidelines, the UK government currently recommends that school-aged children participate in at least 60 minutes, and up to several hours, of at least moderate physical activity on a daily basis. A recent health survey indicates that the amount of reported physical activity varies by age, gender and socioeconomic status. The objective of this study is to identify what types of activity contribute most towards overall physical activity in children who achieve the UK physical activity recommendations; and how this varies according to age, gender and socioeconomic status. Methods Self-reported physical activity was captured through the Health Survey for England 2008, a nationally representative, cross-sectional survey. We analysed data from 1,110 children aged 5–15 years who reported meeting the UK physical activity recommendations. The proportions of total physical activity achieved in various domains of activity were calculated and associations with age, gender and socioeconomic status were examined. Results Active play was the largest contributor to overall physical activity (boys?=?48%, girls?=?53%), followed by walking (boys?=?17%, girls?=?23%). Active school travel contributed only a small proportion (6% for boys and girls). With increasing age, the contribution from active play decreased (rho?=?-0.417; p?contribution of walking (rho?=?0.257; p?contributed more among boys than girls. Sport contributed proportionately less with increasing deprivation (rho?=?-0.191; p?physical activity among active children varies with age, socioeconomic status and gender. This knowledge can be used to target interventions appropriately to increase physical activity in children at a population level.

2013-01-01

404

Application of Physical Optics and Physical Theory of Diffraction to a Smooth Convex Surface  

Microsoft Academic Search

The diffraction of a high-frequency electromagnetic wave by a smooth convex perfectly conducting surface is analyzed in terms of physical optics (PO) and physical theory of diffraction (PTD). The contributions of the PO current and the correction current to the surface-diffracted field near the shadow boundary away from the surface are described, respectively, by the Fresnel function and the non-singular

A. Michaeli

1993-01-01

405

Size and concentration effects in the optical properties of alloyed (AuxAg1 - x)n and core-shell (NixAg1 - x)n embedded clusters  

NASA Astrophysics Data System (ADS)

Optical properties of mixed clusters (AuxAg 1 - x)n and (NixAg 1 - x)n, produced by laser vaporization and embedded in an alumina matrix, are reported. The size effects are investigated for different concentrations (x = 0.25, 0.5 and 0.75) in the diameter range 2-4 nm. For alloyed clusters (AuxAg 1 - x)n of a given size an almost linear evolution of the surface plasmon frequency ?s with the concentration is observed (between those of pure gold and pure silver clusters). Moreover the blue-shift and the damping of the resonance with decreasing size is all the more important as the gold concentration in the particles increases. Such results are in agreement with theoretical calculations carried out in the frame of the time-dependent local-density-approximation (TDLDA) including an inner skin of ineffective screening and the porosity of the matrix. The optical response of (NixAg 1 - x)n clusters exhibits a surface plasmon resonance in the same spectral range as the one observed for pure silver clusters, but considerably damped and broadened. For a given mean cluster size 3.0 nm, a blue-shift of the resonance is observed when increasing the nickel concentration (between x = 0.25 and x = 0.75). The results are in good qualitative agreement with classical predictions in the dipolar approximation, assuming a core-shell geometry.

Gaudry, M.; Lermé, J.; Cottancin, E.; Pellarin, M.; Prével, B.; Treilleux, M.; Mélinon, P.; Rousset, J.-L.; Broyer, M.

406

EDITORIAL: High precision atomic physics High precision atomic physics  

NASA Astrophysics Data System (ADS)

Accurate atomic collision and structure data are an essential ingredient for a wide range of research fields as well as for major technological applications. Areas from laboratory physics to quantum processing, from plasma research applications in nuclear fusion to lighting research, as well as astrophysics and cosmology, depend critically on such data. But many data still exhibit inconsistencies and inaccuracies, so that significant efforts are continuing to improve the data quality. Additionally, a substantial body of much-needed data is absent from the published literature and from databases. Appreciable progress is being made, aided by greatly improved, or even entirely new, laboratory equipment and by vastly expanded computer power, which has made possible the development of greatly refined atomic structure codes. Thus in recent years, atomic data have not only become more accurate, but the body of data has also greatly increased, highly ionized species and complex heavy atoms have been addressed, fully relativistic treatments have been developed, and new energy and frequency ranges have been explored. This special issue focuses on many of these new sophisticated theoretical and experimental approaches that have made high precision atomic physics a reality. On the experimental side, several contributions cover the area of highly charged ions, where accurate measurements have become possible mainly due to the availability of electron beam ion traps (EBITs) and the utilization of storage rings. Studies of QED effects in Li-like ions, determinations of atomic lifetimes and precision wavelength measurements of highly charged ions are discussed. Furthermore, two contributions illustrate the extremely high precision of spectroscopic measurements for heavy ions and atoms, and two fundamental investigations address a new search for the electric dipole moment of the electron and measurements of the anapole moment in Fr and Rb. On the theoretical side, the contributions demonstrate that new, expanded and refined atomic structure and electron-impact collision codes are successfully applied to complex atomic systems, such as highly charged ions and heavy atoms, using increasingly full relativistic treatments.

Hibbert, Alan; Johnson, Walter; Wiese, Wolfgang

2010-04-01

407

Mineral Physics and Mantle Evolution  

NASA Astrophysics Data System (ADS)

Don Anderson has been a steadfast patron and constructive critic of mineral physics for more than 40 years. Although he has never actually done an experiment himself [except for perhaps some early work on ice when he was working in Greenland], he has nurtured and supported two generations of experimental mineral physicists throughout the U.S. His role and influence have been especially evident in studies of the elasticity and anelasticity of minerals and the use of such data for interpretation of seismic models of the Earth's mantle. In the 1960s, such acoustic experiments required specimens of centimeter dimensions and could achieve elevated conditions of less than 1 Gigapascal in pressure and a few hundred degrees of Celsius temperature. Today, one can perform such experiments on specimens only a fraction of a milimeter in size and reach pressures of tens of GPa and temperatures in excess of two thousand degrees C. In addition, Anderson's contributions to organized scientific endeavors have extended far beyond his founding role in IRIS to include advising on the establishment of the new Consortium for Materials Properties Research in Earth Sciences [COMPRES]. We ilustrate his remarkable contributions to mineral physics with examples of our own research, some of it done in collaboration with Anderson.

Liebermann, R. C.; Bass, J. D.; Weidner, D. J.

2003-12-01

408

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

409

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

410

Physical Education Teacher Effectiveness in a Public Health Context  

ERIC Educational Resources Information Center

The health benefits of physical activity are well documented, and the important role that schools and physical education (PE) can play in reducing sedentary behavior and contributing to population health has been identified. Although effective teaching is ultimately judged by student achievement, a major component of teacher and school…

McKenzie, Thomas L.; Lounsbery, Monica A. F.

2013-01-01

411

Mainstreaming the Physically Handicapped Student for Team Sports.  

ERIC Educational Resources Information Center

The article gives suggestions for mainstreaming physically handicapped students into regular physical education classes during instruction in team sports. The report lists six pointers for general class organization and instruction, such as establishing an atmosphere of acceptance, emphasizing the positive contributions each student can make, and…

Grosse, Susan J.

1978-01-01

412

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

413

The future of particle physics in outer space  

Microsoft Academic Search

Particle physics started as the study of cosmic rays. After having settled on the ground for half a century, it is about to conquer the outer space with satellite and space shuttle borne instruments. Particle physics has actually strong connections with astrophysics and cosmology. This contribution deals with a few of these ties. The exploration of the gamma ray sky

P. Salati

1998-01-01

414

The Application of High Energy Physics Techniques in Medical Research  

Microsoft Academic Search

The Medical and Biophysical Sciences have often made use of technical developments in the Physical Sciences. High Energy Physics has made its contributions in recent years by bringing the use of scintillation and solid state detectors in trace element detection and in gamma imaging. More recently, the use of position sensitive detectors such as Multi-wire Proportional Chambers (MWPC) has been

V. Perez-Mendez

1976-01-01

415

Physics Suite Sample Problems: Modern Physics  

NSDL National Science Digital Library

This is a collection of introductory physics problems on topics in 20th century physics. The questions are designed for active learning classrooms and are built around research on student acquisition of knowledge. The problems vary in format and include context-based reasoning, multiple choice, estimation, and essay questions. The topics include conservation of mass and energy, nuclear decay, wave-particle duality, and spectroscopy. This item is part of a larger collection of problems, in-class questions, and interactive resources developed by the University of Maryland Physics Education Research Group.

Redish, Edward F.

2005-08-09

416

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

417

IDS contribution to ITRF2013  

NASA Astrophysics Data System (ADS)

In the context of the forthcoming ITRF 2013, the IDS Combination Center is involved in the estimation of DORIS stations positions/velocities as well as Earth orientation parameters from DORIS data. These computations are based on the latest series of all of the 6 IDS Analysis Centers multi-satellite weekly SINEX solutions from January 1993 to December 2013. The primary objective of this study is to analyze the DORIS contribution to ITRF2013 in terms of (1) geocenter and scale solutions; (2) stations positions. Furthermore, we will focus on the impact of new standards such as the application of DORIS ground antennas phase laws in the data processing and improved modeling of DORIS ground beacon frequency variations. We will also address benefits of including new DORIS data in the IDS combination compared to ITRF2008, including data from new DORIS missions (e.g. Jason-2, Cryosat-2), as well as improved data for both Jason-1 and SPOT-5 where these satellite data are now corrected to accommodate perturbations introduced by the South Atlantic Anomaly (SAA). In addition we will compare this new DORIS ITRF realization to the previous realization (ITRF2008).

Moreaux, Guilhem; Lemoine, Frank; Willis, Pascal; Capdeville, Hugues; Otten, Michiel; Stepanek, Petr; Kuzin, Sergei; Ferrage, Pascale

2014-05-01

418

The microbial contribution to macroecology  

PubMed Central

There has been a recent explosion of research within the field of microbial ecology that has been fueled, in part, by methodological improvements that make it feasible to characterize microbial communities to an extent that was inconceivable only a few years ago. Furthermore, there is increasing recognition within the field of ecology that microorganisms play a critical role in the health of organisms and ecosystems. Despite these developments, an important gap still persists between the theoretical framework of macroecology and microbial ecology. We highlight two idiosyncrasies of microorganisms that are fundamental to understanding macroecological patterns and their mechanistic drivers. First, high dispersal rates provide novel opportunities to test the relative importance of niche, stochastic, and historical processes in structuring biological communities. Second, high speciation rates potentially lead to the convergence of ecological and evolutionary time scales. After reviewing these unique aspects, we discuss strategies for improving the conceptual integration of microbes into macroecology. As examples, we discuss the use of phylogenetic ecology as an integrative approach to explore patterns across the tree of life. Then we demonstrate how two general theories of biodiversity (i.e., the recently developed theory of stochastic geometry and the neutral theory) can be adapted to microorganisms. We demonstrate how conceptual models that integrate evolutionary and ecological mechanisms can contribute to the unification of microbial ecology and macroecology.

Barberan, Albert; Casamayor, Emilio O.; Fierer, Noah

2014-01-01

419

(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

420

Find a Physical Therapist  

MedlinePLUS

... HIV who are seeking to improve physical function, fitness, and quality of life that has been impacted ... disease who are seeking to improve physical function, fitness, and quality of life impacted by these conditions. ...

421

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...

422

International Baccalaureate Physics  

NASA Astrophysics Data System (ADS)

The International Baccalaureate has long been recognized for providing breadth in 16-18 education. This article examines whether it can also provide the depth to match A-levels by comparing IB Higher Physics with A-level Physics.

Votta, P.

1993-05-01

423

Physical Activity and Children  

MedlinePLUS

... Requirements Fit-Friendly Resources The AHA's Recommendations for Physical Activity in Children Updated:May 1,2014 Click image ... Inactive children are likely to become inactive adults. Physical activity helps with: controlling weight reducing blood pressure raising ...

424

Student attitudes to physics  

NSDL National Science Digital Library

Reported is a summary of the responses of 363 college science and engineering students to a questionnaire designed to determine their attitude towards physics. The majority of students found physics moderately interesting.

Briggs, B. H.

2005-11-03

425

Physical Chemistry Animation Index  

NSDL National Science Digital Library

This collection of animations, intended for a physical chemistry course, covers thermodynamics, the physical transformation of substances (such as dissolution), phase diagrams and the behaviour of matter in various states.

426

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

427

Physics to Go  

NSDL National Science Digital Library

The Physics to Go site invites the casual visitor to "explore physics on your own." Providing an assortment of great resources, it does just that. The site functions as a monthly mini-magazine and offers a collection of more than 1000 websites, physics images, and activities. A well-designed site, Physics to Go is divided into sections including Physics in Your World, From Physics Research, and Worth a Look. This last section is a fun place to start, as it offers up a realm of brief profiles such as "Johannes Kepler: The Laws of Planetary Motion" and "The Brightest Supernova Ever." If intrigued by these first two, visitors will love the dozens of additional profiles featured here. Additionally, the From Physics Research area contains profiles of current physics research, copiously illustrated, along with links to original research and commentary. If so desired, users can search the entire archive dating back to 2004.

428

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 ...

429

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

430

Physics Lab Online  

NSDL National Science Digital Library

This collection for high school physics integrates lessons, labs, practice problems, assessments, AP review exercises, simulations, and quizzes in one easily-searched location. Initial development began in 1997, with continual updating and expansion occurring since then. Of special note is the section Amusing Problems, consisting of real-life applications designed to make learners think andlaugh. Each problem provides access to solutions for self-evaluation. Course levels addressed in the collection include algebra-based physics, honors physics, and AP physics.

Colwell, Cathy

2011-09-01

431

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

432

A STUDY OF MAJOR PHYSICAL DISORDERS AMONG THE ELDERLY DEPRESSIVES  

PubMed Central

Psychiatric evaluation and assessment of common physical illnesses and disabilities was carried out in elderly depressives (aged 60 years and above). Correlation, if any, was seen between depression and physical problems. The ‘patient group’ comprised of 40 drawn from MHI, Cuttack, having a depressive disorder (ICD-10). The ‘control group’ of 20 was drawn from the general population with no psychiatric disorder. The presence of physical illness was looked for in both groups. The patient group had physical illnesses, 76% of which were previously undiagnosed. The control group had physical illnesses 71% of which were previously diagnosed. Undiagnosed physical illnesses are more common among elderly patients with depression than among matched control. The physical illnesses contributed in two thirds of the patients. So careful detection and management of physical illness is of equal importance in the management of depression.

Satapthy, Ramanand; Kar, Nilamadhab; Das, Indubhusan; Kar, Gopal Chandra; Pati, Tophan

1997-01-01

433

My Physics Labs - Physics Simulations with Java  

NSDL National Science Digital Library

This web site contains a collection of interactive java simulations for physics. Each simulation includes a detailed explanation of the physics and math behind the system, as well as the numerical methods used to simulate the motion. Most are demonstrations of oscillators, but there are also games related to basic principles of force. Included are the double pendulum, simple pendulum, simple spring, molecular vibration and a chaotic pendulum. The page also links to movies relating to fluid-dynamics and reaction-diffusion.

Neumann, Erik

2005-02-01

434

31 CFR 29.352 - Refunded contributions.  

Code of Federal Regulations, 2013 CFR

...refunds of employee contributions made by police officers and firefighters through pay period 13. If pay period records are unavailable...of the retirement contributions made to police officers or firefighters in calendar year 1997. Otherwise, if the participant...

2013-07-01

435

Amateur Contributions to Eclipsing Binary Astronomy  

NASA Astrophysics Data System (ADS)

Both theoretical and observational contributions have been made by amateurs to the astronomy of eclipsing binary stars. The specific contributions of John Goodricke and Edward Pigott, J. Miller Barr, and Alexander Roberts illustrate this point.

Williams, Thomas R.

1986-06-01

436

45 CFR 1326.9 - Contributions.  

Code of Federal Regulations, 2013 CFR

...AMERICANS PROGRAMS GRANTS TO INDIAN TRIBES FOR SUPPORT AND NUTRITION SERVICES § 1326.9 Contributions. (a) Each tribal...coordinated services systems supported under this part, while using nutrition services contributions only to expand services as...

2013-10-01

437

45 CFR 1321.67 - Service contributions.  

Code of Federal Regulations, 2013 CFR

...all contributions. (b) Each service provider shall use supportive services and nutrition services contributions to expand supportive services and nutrition services respectively. To that end, the State agency shall: (1) Permit...

2013-10-01

438

Financial Analysis of Defined Contribution Plans.  

National Technical Information Service (NTIS)

The study focuses on the rates of return of Defined Contribution (DC) plans, and compares plan types and characteristics in the sponsoring company against returns and contributions per active participants.

J. S. Park

1992-01-01

439

Intuitive ontologies for energy in physics  

NSDL National Science Digital Library

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.

2012-02-06

440

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

441

The Physics Hypertextbook  

NSDL National Science Digital Library

This online textbook contains explanations, examples, and practice problems for many topics in introductory physics. These topics include Mechanics, Matter, Thermal Physics, Waves & Optics, Electricity & Magnetism, and Modern Physics. This textbook is a work in progress and is not yet finished.

Elert, Glenn

2006-07-18

442

Mental health gets physical.  

PubMed

The physical health of people with severe mental illness is often neglected. Patients are more likely to smoke and have a poor diet, while psychiatric medication is known to affect physical health adversely. Yet these patients are less likely to be offered a physical health check. PMID:24802485

2014-05-13

443

Physics in Burma Today  

ERIC Educational Resources Information Center

The method of training physicists, the style in which physics is practiced, the roles of physics and physicists in academia and society are discussed. There are three factors influencing physics: lack of a long standing cultural tradition; competitive and external exams; and career opportunities are extremely limited. (DF)

Rigden, John S.

1973-01-01

444

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

445

Atomic and Molecular Physics  

NASA Technical Reports Server (NTRS)

A symposium on atomic and molecular physics was held on November 18, 2005 at Goddard Space Flight Center. There were a number of talks through the day on various topics such as threshold law of ionization, scattering of electrons from atoms and molecules, muonic physics, positron physics, Rydberg states etc. The conference was attended by a number of physicists from all over the world.

Bhatia, Anand K.

2005-01-01

446

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

447

Fundamental Physical Constants  

National Institute of Standards and Technology Data Gateway

SRD 121 CODATA Fundamental Physical Constants (Web, free access)   This site, developed in the Physics Laboratory at NIST, addresses three topics: fundamental physical constants, the International System of Units (SI), which is the modern metric system, and expressing the uncertainty of measurement results.

448

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

449

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

450

Antiproton physics at BNL  

SciTech Connect

A review of antiproton physics at the brookhaven AGS in past decade is given as well as a description of the present high energy physics program. Existing and potential facilities for antiproton physics at the AGS are discussed and are found to provide useful antiproton intensities over the momentum range proposed for SUPERLEAR in a multiple user environment.

Lazarus, D.M.

1992-01-01

451

Antiproton physics at BNL  

SciTech Connect

A review of antiproton physics at the brookhaven AGS in past decade is given as well as a description of the present high energy physics program. Existing and potential facilities for antiproton physics at the AGS are discussed and are found to provide useful antiproton intensities over the momentum range proposed for SUPERLEAR in a multiple user environment.

Lazarus, D.M.

1992-12-31

452

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

453

IDS contribution to ITRF2008  

NASA Astrophysics Data System (ADS)

For the first time, the International DORIS Service (IDS) has produced a technique level combination based on the contributions of seven analysis centers (ACs), including the European Space Operations Center (ESOC), Geodetic Observatory Pecny (GOP), Geoscience Australia (GAU), the NASA Goddard Space Flight Center (GSFC), the Institut Géographique National (IGN), the Institute of Astronomy, Russian Academy of Sciences (INASAN, named as INA), and CNES/CLS (named as LCA). The ACs used five different software packages to process the DORIS data from 1992 to 2008, including NAPEOS (ESA), Bernese (GOP), GEODYN (GAU, GSC), GIPSY/OASIS (INA), and GINS (LCA). The data from seven DORIS satellites, TOPEX/Poseidon, SPOT-2, SPOT-3, SPOT-4, SPOT-5, Envisat and Jason-1 were processed and all the analysis centers produced weekly SINEX files in either variance-covariance or normal equation format. The processing by the analysis centers used the latest GRACE-derived gravity models, forward modelling of atmospheric gravity, updates to the radiation pressure modelling to improve the DORIS geocenter solutions, denser parameterization of empirically determined drag coefficients to improve station and EOP solutions, especially near the solar maximum in 2001-2002, updated troposphere mapping functions, and an ITRF2005-derived station set for orbit determination, DPOD2005. The CATREF software was used to process the weekly AC solutions, and produce three iterations of an IDS global weekly combination. Between the development of the initial solution IDS-1, and the final solution, IDS-3, the ACs improved their analysis strategies and submitted updated solutions to eliminate troposphere-derived biases in the solution scale, to reduce drag-related degradations in station positioning, and to refine the estimation strategy to improve the combination geocenter solution. An analysis of the frequency content of the individual AC geocenter and scale solutions was used as the basis to define the scale and geocenter of the IDS-3 combination. The final IDS-3 combination has an internal position consistency (WRMS) that is 15 to 20 mm before 2002 and 8 to 10 mm after 2002, when 4 or 5 satellites contribute to the weekly solutions. The final IDS-3 combination includes solutions for 130 DORIS stations on 67 different sites of which 35 have occupations over 16 years (1993.0-2009.0). The EOPs from the IDS-3 combination were compared with the IERS 05 C04 time series and the RMS agreement was 0.24 mas and 0.35 mas for the X and Y components of polar motion. The comparison to ITRF2005 in station position shows an agreement of 6 to 8 mm RMS in horizontal and 10.3 mm in height. The RMS comparison to ITRF2005 in station velocity is at 1.8 mm/year on the East component, to 1.2 mm/year in North component and 1.6 mm/year in height.

Valette, Jean-Jacques; Lemoine, Frank G.; Ferrage, Pascale; Yaya, Philippe; Altamimi, Zuheir; Willis, Pascal; Soudarin, Laurent

2010-12-01

454

TEACHING PHYSICS: Connecting with Advancing Physics  

NASA Astrophysics Data System (ADS)

A case is made for the Institute of Physics to provide services to back up physics courses in the first foundation year in British universities. There are several reasons why it is timely to consider such action. Firstly there are several physics departments in the country which are scarcely large enough to maintain a full four-year honours course while at the same time winning a lucrative research reputation. Secondly, if Advancing Physics, the new A-level initiative sponsored by the Institute of Physics, is successful, there will be a flood of new recruits into the subject, just at a time when the number of places available in universities is static or, more likely, falling. Thirdly, the new students will expect very high standards of presentation, for both practical and theoretical work: standards which, given the resources available to existing departments, will be very hard to provide under the present circumstances. It is proposed that the Standing Committee of Physics Professors should examine whether and in what ways the provision of IOP services to universities might be made. The SCPP is an appropriate body to manage such a resource.

Brown, L. M.

2000-05-01

455

Constraints on New Physics from the Quark Mixing Unitarity Triangle  

SciTech Connect

The status of the unitary triangle beyond the standard model including the most recent results on {delta}m{sub s} on dilepton asymmetries and on width differences is presented. Even allowing for general new physics loop contributions the unitarity triangle must be very close to the standard model result. With the new measurements from the Fermilab Tevatron, we obtain for the first time a significant constraint on new physics in the B{sub s} sector. We present the allowed ranges of new physics contributions to {delta}F=2 processes and of the time-dependent CP asymmetry in B{sub s}{yields}J/{psi}{phi} decays.

Bona, M. [Laboratoire d'Annecy-le-Vieux de Physique des Particules LAPP, IN2P3/CNRS, Universite de Savoie (France); Ciuchini, M.; Lubicz, V. [Dipartimento di Fisica, Universita di Roma Tre and INFN, Sezione di Roma Tre, I-00146 Rome (Italy); Franco, E.; Martinelli, G.; Silvestrini, L. [Dipartimento di Fisica, Universita di Roma ''La Sapienza'' and INFN, Sezione di Roma, I-00185 Rome (Italy); Parodi, F.; Schiavi, C. [Dipartimento di Fisica, Universita di Genova and INFN, I-16146 Genova (Italy); Pierini, M. [Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States); Roudeau, P.; Stocchi, A. [Laboratoire de l'Accelerateur Lineaire, IN2P3-CNRS et Universite de Paris-Sud, BP 34, F-91898 Orsay Cedex (France); Vagnoni, V. [INFN, Sezione di Bologna, I-40126 Bologna (Italy)

2006-10-13

456

Constraints on New Physics from the Quark Mixing Unitarity Triangle  

NASA Astrophysics Data System (ADS)

The status of the unitary triangle beyond the standard model including the most recent results on ?ms on dilepton asymmetries and on width differences is presented. Even allowing for general new physics loop contributions the unitarity triangle must be very close to the standard model result. With the new measurements from the Fermilab Tevatron, we obtain for the first time a significant constraint on new physics in the Bs sector. We present the allowed ranges of new physics contributions to ?F=2 processes and of the time-dependent CP asymmetry in Bs?J/?? decays.

Bona, M.; Ciuchini, M.; Franco, E.; Lubicz, V.; Martinelli, G.; Parodi, F.; Pierini, M.; Roudeau, P.; Schiavi, C.; Silvestrini, L.; Stocchi, A.; Vagnoni, V.

2006-10-01

457

FROM THE HISTORY OF PHYSICS: Moscow State University physics alumni and the Soviet Atomic Project  

NASA Astrophysics Data System (ADS)

In this paper, two closely related themes are addressed: (1) the role that M V Lomonosov Moscow State University (MSU) played in training specialists in physics for the Soviet Atomic Project, and (2) what its alumni contributed to the development of thermonuclear weapons. In its earlier stages, the Soviet Atomic Project was in acute need of qualified personnel, without whom building nuclear and thermonuclear weapons would be an impossible task, and MSU became a key higher educational institution grappled with the training problem. The first part of the paper discusses the efforts of the leading Soviet scientists and leaders of FMD (First Main Directorate) to organize the training of specialists in nuclear physics at the MSU Physics Department and, on the other hand, to create a new Physics and Technology Department at the university. As a result, a number of Soviet Government's resolutions were prepared and issued, part of which are presented in the paper and give an idea of the large-scale challenges this sphere of education was facing at the time. Information is presented for the first time on the early MSU Physics Department graduates in the structure of matter, being employed in the FMD organizations and enterprises from 1948 to 1951. The second part discusses the contribution to the development of thermonuclear weapons by the teams of scientists led by Academicians I E Tamm, A N Tikhonov, and I M Frank, and including MSU physics alumni. The paper will be useful to anyone interested in the history of Russian physics.

Kiselev, Gennadii V.

2005-12-01

458

PREFACE: XXXIV Symposium on Nuclear Physics  

NASA Astrophysics Data System (ADS)

In the present volume of the Journal of Physics: Conference Series we publish the proceedings of the 'XXXIV Symposium on Nuclear Physics', which was held from 4-7 January 2011 at the Hacienda Cocoyoc, Morelos, Mexico. The proceedings consist of 19 contributions that were presented as invited talks at the meeting. The abstracts of all contributions, plenary talks and posters were published in the Conference Handbook. The Symposium on Nuclear Physics has a long and distinguished history. From the beginning it was intended to be a relatively small meeting designed to bring together some of the leading nuclear scientists in the field. Its most distinctive feature is to provide a forum for specialists in different areas of nuclear physics, both theorists and experimentalists, students, postdocs and senior scientists, in a relaxed and informal environment providing them with a unique opportunity to exchange ideas. From the first meeting in Oaxtepec in 1978, the Symposium has been organized every year without interruption, which makes the present Symposium the 34th in a row. The scientific program consisted of 27 invited talks and 17 posters on a wide variety of hot topics in contemporary nuclear physics, ranging from the traditional fields of nuclear structure (Draayer, Pittel, Van Isacker, Fraser, Lerma, Cejnar, Hirsch, Stránský and Rath) and nuclear reactions (Aguilera, Gómez-Camacho, Scheid, Navrátil and Yennello) to radioactive beams (Padilla-Rodal and Galindo-Uribarri), nuclear astrophysics (Aprahamian, Civitarese and Escher), hadronic physics (Bijker, Valcarce and Hess), fundamental symmetries (Liu, Barrón-Palos and Baessler) and LHC physics (Menchaca-Rocha and Paic). The high quality of the talks, the prestige of the speakers and the broad spectrum of subjects covered in the meeting, shows that nuclear physics is a very active area at the frontier of scientific research which establishes bridges between many different disciplines. Libertad Barrón-PalosRoelof BijkerEditors Conference photograph

Barrón-Palos, Libertad; Bijker, Roelof

2011-10-01

459

Une introduction aux subventions intergouvernementales  

Microsoft Academic Search

The principal aim of our paper is to provide a primer on the foundations of the theory of intergovernmental grants, suitable for newcomers to this active field of research. In addition, we provide a selective survey of recent theoretical papers on grants, focusing particularly on non-cooperative games between different levels of government in a federal system. The sections of the

Tracy Snoddon; Jean-François Wen

1999-01-01

460

The Physics Classroom  

NSDL National Science Digital Library

Developed for high school physics students by Glenbrook South High School in Glenview, Illinois, the Physics Classroom Tutorial offers clear and concise details of the basic physics topics. The website, modeled like an online physics book, contains a series of main categories, which are divided into lessons and sub-lessons. Within the sub-lessons, students can find helpful diagrams, animations, and a short quiz to evaluate their understanding of the topics. Because this site offers comprehensive materials, all introductory physics students are sure to obtain a better understanding of the subject by visiting the site.

461

Workshop Tutorials for Physics  

NSDL National Science Digital Library

This resource is a collection of activity-based physics tutorials developed by the University of Sydney Physics Education Research group (SUPER). Designed to be implemented in student-centered cooperative learning environments, the tutorials feature thematic workshops across a broad range of topics for first year physics students. The first volume covers Mechanics, Properties of Matter, and Thermodynamics. The second covers Electromagnetism, Waves (including Optics) and Quantum Mechanics (including Nuclear and Atomic Physics). The third volume describes the hands-on activities for all topics with descriptions of the apparatus and the physics illustrated in each case. Each tutorial is freely accessible in either Word or pdf format.

2008-07-10

462

Geometry and Physics Today  

NASA Astrophysics Data System (ADS)

“ Geometry,” in the sense of the classical differential geometry of smooth manifolds (CDG), is put under scrutiny from the point of view of Abstract Differential Geometry (ADG). We explore potential phys