4,959 research outputs found
Level up learning: a national survey on teaching with digital games
No full textDigital games have the potential to transform K-12 education as we know it. But what has been the real experience among teachers who use games in the classroom? In 2013, the Games and Learning Publishing Council conducted a national survey among nearly 700 K-8 teachers. The report reveals key findings from the survey, and looks at how often and why teachers use games in the classroom, as well as issues they encounter in their efforts to implement digital games into their practice
Gravity in mimetic scalar-tensor theories after GW170817
No full textWe derive the most general mimetic scalar-tensor theory assuming a healthy "seed" action and accounting for the constraints on the speed of gravitational-wave propagation arising from the GW170817 event. By analysing linear perturbations around a flat FLRW background in this model, we obtain a suitable form of the Poisson equation, which allows us to calculate the effective gravitational constant felt by "ordinary" matter. By restricting to a minimally coupled model, such an effective gravitational constant is equivalent to that obtained within General Relativity, with cold dark matter plus a perfect fluid dark energy component, with vanishing sound speed. Assuming, further, a Lambda CDM background, the effective gravitational constant cannot be distinguished from that of the standard Lambda CDM model, at linear order. For the full non-minimally coupled mimetic gravity model we obtain a non-vanishing gravitational slip and an effective gravitational constant which always differs from that of standard Lambda CDM
Qui vive! [music] : grand galop de concert pour piano, op. 12 /
No full textA. & P. No. 925 (Publisher number). Pl. no.: A. & P. No. 925.; "To Miss Eleanor Ward".; Cover title.; Also available online http://nla.gov.au/nla.mus-vn2052438
Living with Seismic Phenomena in the Mediterranean and Beyond between Antiquity and the Middle Ages. Proceedings of Cascia (25-26 October, 2019) and Le Mans (2-3 June, 2021) Conferences
No full textIn terms of seismic risk mitigation, archaeoseismological research in architectural field is interesting because it deals with two
of the three aspects that determine seismic risk of a site. Firstly, such research provides important information on the seismic
history of the area in which the object of the study is located, thus providing background for investigating seismic hazard.
Secondly, it offers a better understanding of the structural behaviour of the building in relation to seismic stress, suggesting the
best method of intervention to reduce its vulnerability. Although early studies in this field have achieved interesting results, we
are still far from having identified an applicative method for this new kind of data. The state of current knowledge, as well as
potential and unresolved questions regarding this new and interesting discipline will be illustrated. The author will also present
the case study of medieval Venetian bell towers, which have undergone strong seismic action in antiquity
Determinants and constraints of feather growth.
No full textDuring the periodic moult of the plumage of birds, a fast regrowth of feathers would shorten the time of reduced plumage functionality. However, it has long been known that feather growth-rate is limited and that long feathers take disproportionally longer to grow than small feathers, which has severe consequences on moult duration and the completeness of moult in large birds. The reasons for the limitations of feather-growth must be related to the size and/or functions of the feather follicle, but are largely unknown. Here we measured the size of the feather follicle (taking calamus width as a proxy) and related it to parameters of feather growth (feather growth-rate by mass and by length) and feather structure (feather length, mass, massiveness [mass of feather material per mm feather-length]). We used three independent datasets which allowed for interspecific analyses, and for intraspecific comparisons of differently structured feathers within the framework of biological scaling. We found that the cross-sectional area of the calamus (as a proxy of feather follicle size) was directly proportional to feather growth-rate by mass. Hence, factors acting at a two-dimensional scale (possibly nutrient supply to the growing feather) determines feather growth rate by mass, rather than the linear arrangement of stem cells (in a circular configuration) as had previously been assumed. Feather follicle size was correlated with both feather length and massiveness, hence it seems to be adapted to some extent to feather structure. Feather growth-rate by length was dependent on both the feather material produced per unit time (growth-rate by mass) and the amount of material deposited per unit feather-length. Follicle size not only determines feather growth-rate by mass, but also directly the structural design (shape, number of barbs, etc.) of a feather. Therefore, feather growth-rate is severely constrained by the requirements imposed by the structural feather design
Waiting for the end of the world? New perspectives on natural disasters in medieval Europe
No full text
Rutherford Aris (1929-2005)
No full textGanz David. Rutherford Aris (1929-2005). In: Gazette du livre médiéval, n°47. Automne 2005. p. 103
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