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Search Results: 1 - 10 of 752 matches for " Juha Valtonen "
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The Relationships between Pre-Service Primary Teachers’ Teaching and Instructing/Coaching Orientations, and Their Perceived Strengths in Teaching Physical Education at the Primary Level  [PDF]
Juha Valtonen, Mirja Hirvensalo, Jyrki Reunamo, Heikki Ruism?ki
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.511109
Abstract: This study explored if the orientations towards instructing/coaching in physical activities (PA) and teaching physical education (PE) affect the perceived strengths in teaching PE at the primary level (PSTPEs). The orientations were considered as socializing factors into teaching PE. In this study, the perceived strengths were divided into discipline- and pupil-focused strengths. Online questionnaire was used to collect the data from 386 first year pre-service primary teachers before their first PE course of formal teacher education, to expose the acculturative influences of the orientations. Cross tabulation and logistic regression were used to analyze the relationships. The main results suggested that pre-service primary teachers with an instructing/coaching orientation perceived discipline-focused strengths (sportiness and teaching skills) as their assets in teaching PE contrasted by the finding that those with teaching orientation and without instruction/coaching orientation more likely perceived the pupil-focused empathy as their main asset. Even though, the associations were not strong, they exposed interesting directions of effects of acculturative socialization into teaching in terms of perceived strengths. This study adds to the existing research on teaching PE information of the acculturative formation of discipline- and pupil-focused PSTPEs through instruction/coaching and teaching orientations. In order to develop the effectiveness of formal teacher education, we suggest widening and deepening the research of acculturative formation of the perceived strengths and particularly their practical influences on formal teacher training and later on their behavior while teaching PE.
Three-body problem and multiple stellar systems
M. Valtonen
Revista mexicana de astronomía y astrofísica , 2004,
Abstract: Las interacciones de tres cuerpos ocurren en c umulos estelares, donde se dan encuentros entre binarias y estrellas sencillas formando temporalmente sistemas triples. Las triples son generalemente inestables y se fragmentan en una nueva binaria y una estrella sencilla. La simple dispersi on de una estrella sencilla por una binaria tambi en ocurre. Ambos procesos pueden ser estudiados con la teor a estad stica del rompimiento y la dispersi on de tres cuerpos. En este trabajo, aplicamos la teor a a las estrellas binarias, suponiendo que estas han participado en procesos de tres cuerpos. Se discuten las distribuciones de los per odos, las excentricidades y los cocientes de masa de las binarias obtenidos, y se comparan con muestras observacionales.
Innovation Pedagogy for Universities of Applied Sciences  [PDF]
Juha Kettunen
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.21008
Abstract: This study presents the concept of innovation pedagogy, which is a pedagogical approach developed for the universities of applied sciences. Innovation pedagogy emphasises efficient learning and the institution’s external impact on regional development. It is based on customer-oriented and multi-field needs of working life; integrates applied research and development and entrepreneurship with education in a flexible way; and promotes regional and international networking. This approach is clearly wider than the traditional individual-based learning, because it emphasises group-based and networked learning to promote innovations in working life.
University Curriculum—Recent Philosophical Reflections and Practical Implementations  [PDF]
Juha Himanka
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.412A2015
Abstract: Philosophers Martha Nussbaum and Alasdair MacIntyre have recently made a discussion on the university curriculum. MacIntyre formulated the problem in the following way: “a surprising number of the major disorders of the latter part of the twentieth century and the first decade of the twenty-first century have been brought about by some of the most distinguished graduates of some of the most distinguished universities in the world”. The problem is that these universities give inadequate general education. The situation even seems to be getting worse as Nussbaum is concerned about the direction that curriculum design has recently taken in some parts of the world. In this article, however, I will cite a few examples of university curriculum design that give some promising solutions to the problems posed by philosophers. Especially the new Common Core Curriculum of the University of Hong Kong offers possibilities that might lead the way to a new and more responsible manner of designing a university curriculum.
Review of "Fish diseases, Volumes 1 and 2." by Jorge C. Eiras, Helmut Segner, Thomas Wahli and G.B. Kapoor
E Tellervo Valtonen
Parasites & Vectors , 2009, DOI: 10.1186/1756-3305-2-46
Abstract: Parasitic diseases and parasites in general are enormous in numbers. In fact, parasites alone encompass more than half of all known animal species. Accordingly, the agents causing fish diseases are diverse, including viruses, bacteria, fungi and parasites.This set of two books aims to present disease-causing agents from all these major categories. The topic is wide as diseases occur in freshwater and marine aquacultures as well as in wild fish. Problems with disease are increasing due to intensified fish farming and to many changes in the environment. Moreover, problems vary considerably between different geographic regions, aquaculture systems, fish species, and societies. As such, the topic of these books is most demanding and ambitious. Clearly, nobody can single-handedly handle all aspects of the most important fish diseases even in two books.The editors have succeeded in inviting qualified scientists to write chapters on each disease group. The editors, three from Europe and one from India, have invited 28 scientists from 12 countries to write the books' 21 chapters. Sixteen scientists are from Europe, seven from the USA, two from Australia, and one each from Canada, South Africa, and Israel. The author(s) of each chapter often come from the same country or institute, and in a few cases, this is reflected in the content of the chapter; the problems of his/her region are given considerable attention. It might have been beneficial to add one more scientist representing a different system or latitude to each topic.Every group of disease agents has its own peculiarities, e.g. viruses and bacteria need a different kind of approach than parasites. Accordingly, there is much variation in the composition of the chapters. Nonetheless, I found the treatment of different groups disproportionate in some cases. For example, about 200 pages in three chapters are given to viral diseases (in salmonids, cyprinids and cultured marine fish, all comprehensive and good chapters), b
OJ287: a binary black hole system
M. J. Valtonen
Revista mexicana de astronomía y astrofísica , 2008,
Abstract: Usando el destello de noviembre de 2005 como un punto fijo, derivamos nuevas soluciones para el modelo de agujero negro binario de OJ287. Modelos anteriores habían usado el destello de septiembre de 1994, y dado que su determinación no es muy precisa, había incertidumbres importantes en la órbita. Los parámetros del sistema que se han encontrado son el periodo orbital, determinado por el tiempo transcurrido entre los destellos de 1947.30 y 1983.00, la orientación del eje mayor orbital en un momento dado, determinado por el destello de 1972.97, el factor de retraso temporal, que es una función del ancho del disco y determinado por el destello de 2005.76 y la tasa de precesión determinada por el destello de 1913.00. Se encuentra una única solución tanto para un modelo en el que se considera radiación gravitacional como para uno en el que ésta no es considerada. El destello de septiembre de 2007 se espera para 2007.70 (septiembre 13 + o - unos días) en el primer modelo y a principios de octubre en el segundo. Las tres semanas de diferencia entre los dos modelos serán fácilmente resueltas temporalmente en las observaciones por lo que la emisión de radiación gravitacional podría ser medida de manera indirecta. Observaciones de rayos-X soportan la idea de que el destello de 2005 está relacionado con el impacto del agujero negro secundario sobre el disco de acreción del agujero negro primario.
The 2005 - 2010 multiwavelength campaign of OJ287
Mauri Valtonen,Aimo Sillanp??
Physics , 2011,
Abstract: The light curve of quasar OJ287 extends from 1891 up today without major gaps. This is partly due to extensive studies of historical plate archives by Rene Hudec and associates, and partly due to several observing campaigns in recent times. Here we summarize the results of the 2005 - 2010 observing campaign, in which several hundred scientists and amateur astronomers took part. The main results are the following: (1) The 2005 October optical outburst came at the expected time, thus confirming the General Relativistic precession in the binary black hole system. At the same time, this result disproved the model of a single black hole system with accretion disk oscillations, as well as several toy models of binaries without relativistic precession. (2) The nature of the radiation of the 2005 October outburst was expected to be bremsstrahlung from hot gas at a temperature of 3 10^5 degrees K. This was confirmed by combined ground based and ultraviolet observations using the XMM-Newton X-ray telescope. (3) A secondary outburst of the same nature was expected at 2007 September 13. Within the accuracy of the observations (about 6 hours), it started at the correct time. Due to the bremsstrahlung nature of the outburst, the radiation was unpolarized, as expected. (4) Further synchrotron outbursts were expected following the two bremsstrahlung outbursts. They came as scheduled between 2007 October and 2009 December. (5) Due to the effect of the secondary on the overall direction of the jet, the parsec scale jet is expected to rotate in the sky by a large angle, which has been confirmed. The OJ287 binary black hole system is currently our best laboratory for testing theories of gravitation. Using OJ287, the correctness of General Relativity has now been demonstrated up to the second Post-Newtonian order, higher than has been possible using binary pulsars.
OJ 287 binary black hole system
Mauri Valtonen,Stefano Ciprini
Physics , 2011,
Abstract: The light curve of the quasar OJ 287 extends from 1891 up today without major gaps. Here we summarize the results of the 2005 - 2010 observing campaign. The main results are the following: (1) The 2005 October optical outburst came at the expected time, thus confirming the general relativistic precession in the binary black hole system. This result disproved the model of a single black hole system with accretion disk oscillations, as well as several toy models of binaries without relativistic precession. In the latter models the main outburst would have been a year later. (2) The nature of the radiation of the 2005 October outburst was expected to be bremsstrahlung from hot gas at the temperature of $3\times 10^{5}$ $^{\circ}$K. This was confirmed by combined ground based and ultraviolet observations using the XMM-Newton X-ray telescope. (3) A secondary outburst of the same nature was expected at 2007 September 13. Within the accuracy of observations (about 6 hours), it started at the correct time. Thus the prediction was accurate at the same level as the prediction of the return of Halley's comet in 1986. (4) Further synchrotron outbursts were expected following the two bremsstrahlung outbursts. They came as scheduled between 2007 October and 2009 December. (5) Due to the effect of the secondary on the overall direction of the jet, the parsec scale jet was expected to rotate in the sky by a large angle around and after 2009. This rotation may have been seen at high frequency radio observations. OJ 287 binary black hole system is currently our best laboratory for testing theories of gravitation. Using OJ 287, the correctness of General Relativity has now been demonstrated at higher order than has been possible using the binary pulsars.
A helical jet model for OJ287
Mauri Valtonen,Pauli Pihajoki
Physics , 2013, DOI: 10.1051/0004-6361/201321754
Abstract: Context. OJ287 is a quasar with a quasi-periodic optical light curve, with the periodicity observed for over 120 years. This has lead to a binary black hole model as a common explanation of the quasar. The radio jet of OJ287 has been observed for a shorter time of about 30 years. It has a complicated structure that varies dramatically in a few years time scale. Aims. Here we propose that this structure arises from a helical jet being observed from a small and varying viewing angle. The viewing angle variation is taken to be in tune with the binary orbital motion. Methods. We calculate the effect of the secondary black hole on the inner edge of the accretion disk of the primary using particle simulations. We presume that the axis of the helix is perpendicular to the disk. We then follow the jet motion on its helical path and project the jet to the sky plane. This projection is compared with observations both at mm waves and cm waves. Results. We find that this model reproduces the observations well if the changes in the axis of the conical helix propagate outwards with a relativistic speed of about 0.85c. In particular, this model explains at the same time the long-term optical brightness variations as varying Doppler beaming in a component close to the core, i.e. at parsec scale in real linear distance, while the mm and cm radio jet observations are explained as being due to jet wobble at much larger (100 parsec scale) distances from the core.
Seismic analysis of aircraft accidents  [PDF]
Matti Tarvainen, Outi Valtonen, Eystein S. Husebye, Bj?rn Lund
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.57098
Abstract:

Seismic records from Finnish and Swedish stations were analyzed for a study of two aircraft accidents in Finland and Sweden. A Hornet F-18 fighter crashed in central Finland, and analysis of recorded impact signals from 7 nearby seismic stations yielded in a crash location only 4 km in error. An estimated magnitude (ML) of 0.5 units gave an impact velocity of 335 m/sec (1200 km/h), which was in excellent agreement with that reported by the Finnish Air Force. A Norwegian Hercules transport plane crashed in foul weather near the summit of Mt. Kebnekaise, NW Sweden. Both seismic and infrasound signals were weak, and in our interpretation, this implied that the Hercules aircraft had a less steep impact angle against the mountain. We also examined seismic analyses of other spectacular air accidents like that of Lockerbie, UK in 1988, and terrorist aircraft attacks on September 11th, 2001 in the USA. Likewise, accidents at sea, such as the sinking of the Russian submarine Kursk in the Barents sea in 2000, and the freighter M/S Rocknes near Bergen in 2004, were recorded and analyzed seismically. In this study, we demonstrated that it was feasible to use seismic registrations to locate impact sites, and to define the exact time of such accidents. Also, negative evidence, i.e., lack of seismic recordings, may provide some information of such accidents and their consequences.

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