1,721,571 research outputs found
borgi-s/wavefront_propagation: v1.001
No full texthttps://github.com/Multiscale-imaging/forward_simulation_polychromati
Neolithic and Early Bronze Age Occupations at Ras Al-Hadd HD-5, Sultanate of Oman
No full textThe archaeological site of HD-5 is located at Ras Al-Hadd (Ash-Sharqiyah Governorate, Sultanate of Oman), on a rocky hill facing the sea, 1.6 kilometer north of the large Hafit site of HD-6. In four campaigns, from 2010 to 2015, an 11 x 10 m area was explored using a micro-stratigraphic approach for the excavation of the loose sandy layers that formed the deposit. The excavation revealed two main occupation phases divided by a frequentation gap, a late Neolithic one in the 4th millennium BC and the other at the end of the 3rd millennium BC. The Neolithic occupation included a series of human depositions along the northern side of the explored area
Ras al-Hadd HD-5 e la Pesca nel Neolitico | Ras al-Hadd HD-5 and Fishing in the Neolithic
No full textThe archeological site of HD-5 is located at Ras al-Hadd on a rocky hill facing the sea. Excavations revealed two main occupation phases, one in the late Neolithic during the fourth millennium and the other at the end of the third millennium BC. In both periods, the subsistence activities focused on the exploitation of coastal resources, while the breeding and hunting of land mammals was less important. Noteworthy is, therefore, the presence in the late Neolithic levels of several domestic dogs, whose remains testify to their use for human consumption
Metamaterial beam with embedded nonlinear vibration absorbers
No full textIn this work the multi-mode vibration absorption capability of a nonlinear metamaterial beam is investigated. A Euler–Bernoulli beam is coupled to a distributed array of nonlinear spring–mass subsystems acting as local resonators/vibration absorbers. The dynamic behavior of the metamaterial beam is first investigated via the classical approach employed for periodic structures by which the frequency stop bands of the single cell are determined. Subsequently, the frequency response is obtained for the metamaterial beam to study a multi-frequency stop band system by adding an array of embedded nonlinear local resonators. A path following technique coupled with a differential evolutionary optimization algorithm is adopted to obtain the optimal frequency-response curves of the metamaterial beam in the nonlinear regime. The use of the local absorbers, via a proper tuning of their constitutive parameters, allows a significant reduction of the metamaterial beam oscillations associated with the lowest three vibration modes
Da Gutemberg a Google Print: l'Accademia delle Scienze di Torino e l'evoluzione dell'ICT del patrimonio culturale.
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Electrical stresses during transients in linear MHD channels
No full textElectrodynamical (electric field, current density, electrical power density), hydrodynamic (shear stress) and thermal (heat flux density towards the walls) stresses in a linear segmented Faraday MHD channel have been investigated by means of numerical methods for the startup procedure, a transient from the open circuit (k=1) conditions to loads with K=0.5 (optimum load) and 0.3. The main characteristics of the MHD channel were chosen corresponding to a sample having been investigated before. It has been found that the hydrodynamical and thermal stresses manifest no increase due to the transient when compared with their steady state values. However, at k≠0.5 these can be larger than at k=0.5. In contrary to this, the electrical stresses show unwanted increases at k=0.3. Therefore, it is important to work at k=0.5. Several results of the calculations have been plotted graphically. Some recommendations for the channel design have been given
Is Primatology an equal-opportunity discipline?
Full text linkThe proportion of women occupying academic positions in biological sciences has increased in the past few decades, but women are still under-represented in senior academic ranks compared to their male colleagues. Primatology has been often singled out as a model of ‘‘equal-opportunity’’ discipline because of the common perception that women are more represented in Primatology than in similar fields. But is this indeed true? Here we show that, although in the past 15 years the proportion of female primatologists increased from the 38% of the early 1990s to the 57% of 2008, Primatology is far from being an ‘‘equal-opportunity’’ discipline, and suffers the phenomenon of ‘‘glass ceiling’’ as all the other scientific disciplines examined so far. In fact, even if Primatology does attract more female students than males, at the full professor level male members significantly outnumber females. Moreover, regardless of position, IPS male members publish significantly more than their female colleagues. Furthermore, when analyzing gender difference in scientific productivity in relation to the name order in the publications, it emerged that the scientific achievements of female primatologists (in
terms of number and type of publications) do not always match their professional achievements (in terms of academic position). However, the gender difference in the IPS members’ number of publications does not correspond to a similar difference in their scientific impact (as measured by their H index), which may indicate that female primatologists’ fewer articles are of higher impact than those of their male colleagues
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