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Search Results: 1 - 10 of 181010 matches for " Maycke Young de; "
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Coautoria na produ??o científica do PPGGeo/UFRGS: uma análise de redes sociais
Lima, Maycke Young de;
Ciência da Informa??o , 2011, DOI: 10.1590/S0100-19652011000100003
Abstract: iin this article it was studied the scientific collaboration networks formed from a group of researchers linked to the programa de pós-gradua??o em geociências da universidade federal do rio grande do sul (ppggeo/ufrgs), based on a theoretical-methodological approach known as social network analysis (sna), considering some concepts from pierre bourdieu's theory of practice, and focusing on the identification, characterization and the structural evolution of scientific co-authorship networks. three networks were built based on data from the capes' cadernos de indicadores related to the intervals 1998-2000, 2001-2003 and 2004-2006. the results characterized the structure of the networks, comparing them, focusing on their connectivity and centrality, taking into consideration the research lines, projects and groups of actors. the networks of 1998-2000, 2001-2003 and 2004-2006 had, respectively, 524 actors and 11.296 links; 576 actors and 14.674 links; 741 actors and 14.188 links. it was found that the central/dominant group of actors in the networks is formed mainly by teachers and, in general, this group tends to remain in the central/dominant positions over the years; it was also found that there are partnerships recurrences in the scientific knowledge production in the three networks, culminating in a social reproduction of the co-authorship network structure.
Avalia??o de aspectos formais em quatro periódicos científicos na área de educa??o especial
Hayashi, Maria Cristina Piumbato Innocentini;Hayashi, Carlos Roberto Massao;Lima, Maycke Young de;Silva, Márcia Regina da;Garrutti, érica Aparecida;
Revista Brasileira de Educa??o Especial , 2006, DOI: 10.1590/S1413-65382006000300006
Abstract: assessment of a given periodical is basic to measuring the quality of research, as well as its reliability and seriousness. the objective of this article is to identify formal aspects to be improved and aspects that are already adequate to the formality required of the universe of scientific publications; to this end, an analysis methodology was applied to the periodicals to enable the identification of formal aspects of the publication. four publications from the field of special education were evaluated, those being, benjamin constant, revista brasileira de educa??o especial, revista educa??o especial and espa?o, in relation to the formal aspects of each periodical. the conclusions showed that the periodicals analyzed have already achieved some criteria, but there is still work to be done if they are to achieve all criteria described in the work.
How Does Radio AGN Feedback Feed Back?
David S. De Young
Physics , 2010, DOI: 10.1088/0004-637X/710/1/743
Abstract: Radio AGN feedback is often assumed to work, but detailed physical models of this process are not well developed. This paper examines a possible path for radio AGN feedback to heat the gas in and around galaxies and perhaps suppress star formation. Nearby radio AGN are almost all FR-I radio galaxies, and it is argued that such outflows become decelerated and fully turbulent in their early stages. A 3D non-linear MHD turbulence calculation is made to determine the time required for this outflowing turbulent energy to be converted into heat. Using radio and x-ray observations of nearby FR-I AGN for normalization results in a time for the onset of heating of about 100 million years. This is comparable to the gas cooling times in and around galaxies, and the resulting location of heat deposition is consistent with FR-I outflows.
Relic Radio Bubbles and Cluster Cooling Flows
David S. De Young
Physics , 2003, DOI: 10.1046/j.1365-8711.2003.06719.x
Abstract: Recent suggestions that buoyant radio emitting cavities in the intracluster medium can cause significant reheating of cooling flows are re-examined when the effects of the intracluster magnetic field are included. Expansion of the cavity creates a tangential magnetic field in the ICM around the radio source, and this field can suppress instabilities that mix the ICM and the radio source. The onset of instability can be delayed for ~100 million years, and calculation of the actual reheating time shows that this may not occur until about 1Gy after creation of the cavity. These results may explain why the relic radio bubbles are still intact at such late times, and it may imply that the role of radio sources in reheating the ICM should be re-examined. In addition, the existence of relic radio cavities may also imply that the particle content of radio source lobes is primarily electrons and protons rather than electrons and positrons.
Changing the Message from Don t to Do : Awareness-raising Strategies for Responsible Alcohol Use at a South African University
Vivian de Klerk,Charles Young
Theory and Practice in Language Studies , 2012, DOI: 10.4304/tpls.2.2.224-232
Abstract: This paper provides an overview of research on drinking behavior at a South African University. It describes new interventions, aimed to focus more positively on norms and the environment, and using Systemic Functional Grammar as a tool, provides a comparative linguistic analysis of the language used in ‘public’, alcohol-related texts before and after these interventions, in order to highlight the powerful effect of language in influencing attitudes to alcohol usage. After a brief discussion of these findings, some implications for practitioners are suggested
Behavioural responses of captive-born greater rheas Rhea americana Linnaeus (Rheiformes, Rheidae) submitted to antipredator training
Azevedo, Cristiano S. de;Young, Robert J.;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000100010
Abstract: human activities have been diminishing greater rhea rhea americana (linnaeus, 1758) populations throughout their natural distribution. the reintroductions of captive-born greater rheas have been tried but without success; since the individuals reintroduced were killed by predators. captive-born animals that have been isolated from predators for many generations can lose their predator recognition abilities. to enhance the survival rates of the reintroduced animals, researchers are now using antipredator training techniques. we studied the response of 15 zoo-borne greater rheas to antipredator training. the animals were divided into three groups: two test groups and one control group. we ran 15 antipredator tests and four control testes with each group. antipredator tests consisted of pairing a taxidermized predator model or a real predator (domestic dog) with a simulation of a capture procedure. control tests consisted of presenting the predator model (jaguar) to the birds, after training but not associating it with an aversive event and recording behavioural responses. all tests were video-recorded and analysed a posteriori. results showed that the trained rheas responded appropriately to the predators, becoming more vigilant and that there was considerable individual differences in response to antipredator training. the results demonstrated that antipredator training is effective and therefore an invaluable tool for reintroduction projects involving greater rheas. furthermore, the methods employed in this research project should be applicable to other species of flightless birds.
Shyness and boldness in greater rheas Rhea americana Linnaeus (Rheiformes, Rheidae): the effects of antipredator training on the personality of the birds
Azevedo, Cristiano S. de;Young, Robert J.;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000100012
Abstract: the shy-bold continuum is an axis of behavioural variation for some species, but the consequences of shyness and boldness in antipredatory behaviour is unknown. bold animals have the tendency to be predated first after release in comparison to shy animals, who naturally avoid the predators. antipredatory training has been used to enhance the defence behaviours of naive animals by various researchers around the world. for greater rheas, rhea americana (linnaeus, 1758), this kind of study is pioneer. in this study we have investigated if there are relationships between personality and performance of greater rheas in antipredatory training. we also investigated if the training procedures influenced the behaviour of the birds when presented to novel objects. fifteen zoo-borne greater rheas were studied and 16 personality tests were run, being eight before the application of antipredator training, and eight after the training. we presented to the birds four novel objects (ball, box, bag and person) and recorded their behaviour and the distance of the birds in relation to the objects. results showed that the birds behave boldly before training and shyly after it. the antipredator training modified significantly the behaviour of the rheas, making them more careful about novel situations. personalities affected the behaviour of the birds during antipredator training. the study of the animal personalities can be an useful tool in reintroduction programs since it helps to choose the animals with the highest chance of survival to reintroduce.
Do captive-born greater rheas Rhea americana Linnaeus (Rheiformes, Rheidae) remember antipredator training?
Azevedo, Cristiano S. de;Young, Robert J.;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000100011
Abstract: the antipredator training is a powerful tool now being used to help the reintroduced animals to recognise and escape from their predators. testing the memory capacity of the animals after antipredator training is important to evaluate if the application of the training is worthwhile. a group of 15 captive-born greater rheas was studied at belo horizonte zoo. eight birds were antipredator trained and seven birds were not. after the end of the antipredator training sessions, we run four memory tests at 40, 55, 70 and 88 days after training was completed. the memory tests consisted of showing a predator model to the rheas and recording their behavioural responses. it was measured the capacity of antipredator information storage, the influence of the group size on the behaviour of the birds and the influence of the antipredator training on the elicitation of the correct behavioural responses of the birds when confronted by a predator. the results showed that the rheas retained predator recognition for almost three months, that the group size affected the responses of the birds (more defence behaviours expressed when tested alone) and that the antipredator training is essential to elicit the adequate antipredatory responses, since untrained birds behaved in a tranquil manner when confronted by a predator model. we concluded that antipredator training is worthwhile for future reintroduction programs for greater rheas, since their memory capacity is considerable.
Brief communication "On one mechanism of low frequency variability of the Antarctic Circumpolar Current"
O. G. Derzho,B. de Young
Nonlinear Processes in Geophysics (NPG) , 2011,
Abstract: In this paper we present a simple analytical model for low frequency and large scale variability of the Antarctic Circumpolar Current (ACC). The physical mechanism of the variability is related to temporal and spatial variations of the cyclonic mean flow (ACC) due to circularly propagating nonlinear barotropic Rossby wave trains. It is shown that the Rossby wave train is a fundamental mode, trapped between the major fronts in the ACC. The Rossby waves are predicted to rotate with a particular angular velocity that depends on the magnitude and width of the mean current. The spatial structure of the rotating pattern, including its zonal wave number, is defined by the specific form of the stream function-vorticity relation. The similarity between the simulated patterns and the Antarctic Circumpolar Wave (ACW) is highlighted. The model can predict the observed sequence of warm and cold patches in the ACW as well as its zonal number.
地质学报 , 1929,
Abstract: ThethickandwidelyexposedJurassicandTriassicbedsofWesternShansiandNorthernShensiareextraordinarilybarrenofanimalfossils.WiththeexceptionoftheganoidfishesfoundbyC.C.Wang,LicentandTeilhardinthespecialhorizon(jasper-bearinglimestone)whichunderliesthe
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