Search results for "REEs"
showing 10 items of 921 documents
Estudio de los factores ambientales que afectan a la conducta de actividad física en niños y niñas en edad preescolar
2017
Introducción: La actividad física es una conducta de salud que conlleva múltiples beneficios para la población. En niños y niñas de preescolar, la realización de actividad física conlleva una mejora de la adiposidad corporal, salud ósea, desarrollo de habilidades motoras, salud psicosocial, desarrollo cognitivo y aspectos de la salud cardiometabólica. La realización de dicha actividad va a depender de varios factores, entre los que se encuentran factores ambientales, así como el tiempo en el que pasan los niños y niñas en el contexto escolar. Objetivo general: Conocer y analizar los factores, sobre todo ambientales, que influyen en la conducta de actividad física de los niños y niñas en eda…
Re-giardinieri e Natura selvaggia. Implicazioni politico-simboliche dello sradicamento, taglio e trasporto in città degli alberi nella Mesopotamia de…
2022
In Sumerian mythological literature, as in coeval Akkadian one, between the end of the 3rd and the beginning of the 2nd millennium, the ruler, foremost among them Gilgameš, on several occasions uproots and/or cuts down trees. These trees should be understood as elements of a wider ‘Wilderness’, with which they share a powerful and ambiguous ontological otherness compared to the city and, more generally, to the land of Sumer. The action of the king on the tree, like that of a farmer or gardener, with the consequent realization of ‘artefacts’, allows, through a cultural organization of the power of the tree, the renewal of the relationship, always subject to crisis, between the human communit…
Recovery of Lithium Carbonate from Dilute Li-Rich Brine via Homogenous and Heterogeneous Precipitation
2022
An extensive experimental campaign on Li recovery from relatively dilute LiCl solutions (i.e., Li+ similar to 4000 ppm) is presented to identify the best operating conditions for a Li2CO3 crystallization unit. Lithium is currently mainly produced via solar evaporation, purification, and precipitation from highly concentrated Li brines located in a few world areas. The process requires large surfaces and long times (18-24 months) to concentrate Li` up to 20,000 ppm. The present work investigates two separation routes to extract Li+ from synthetic solutions, mimicking those obtained from low-content Li+ sources through selective Li+ separation and further concentration steps: (i) addition of …
Simulazione numerica tridimensionale del campi de moto indotti dal vento
2006
Nell’articolo viene proposto un modello numerico tridimensionale al volume finiti, che viene utilizzato per la simulazione di campi di moto indotti dal mento in corpi idrici con batimetria complessa. I risultati numerici sono confrontati con misure sperimentali. Al fine di verificare gli effetti sul calcolo del campi idrodinamici di alcume ipotesi simplificative, relative alla distribuzione verticale della pressione e degli sforzi di Reynolds, sono stati quindi condotti alcuni test numerici, dai quali si è evidenziato che l’ipotesi di distribuzione idrostatica delle pressioni, cui si fa ricorso nelle approssinazioni di tipo “quasi-3D”, può essere utilizzata per il carcolo del profili vertic…
The Windy clustered prize-collecting arc-routing problem
2011
This paper introduces the windy clustered prize-collecting arc-routing problem. It is an arc-routing problem where each demand edge is associated with a profit that is collected once if the edge is serviced, independent of the number of times the edge is traversed. It is further required that if a demand edge is serviced, then all the demand edges of its component are also serviced. A mathematical programming formulation is given and some polyhedral results including several facet-defining and valid inequalities are presented. The separation problem for the different families of inequalities is studied. Numerical results from computational experiments are analyzed. © 2011 INFORMS.
Nota di archeologia postclassica. A proposito della via dei sepolcri nella necropoli paleocristiana di Agrigento tra preesistenze e trasformazioni
2013
Trenta anni di scavi e ricerche nell'area della necropoli paleocristiana di Agrigento hanno evidenziato la presenza di una arteria che servì il cimitero dal IV all'VIII secolo. La strada riutilizzava il tracciato di un acquedotto di età greca che alimentava una serie di cisterne a loro volta trasformate in spazi funerari privati o comunitari. Dopo l'abbandono e la distruzione e del cimitero, nell' XI secolo, nell'area fu impiantata un'officina ceramica per la produzione di vasellame di uso comune.
Acciones para mejorar la eficiencia energética en los edificios en Europa: estado del arte sobre los standards técnicos
2022
The paper is aimed at reviewing the state of the art of the European technical normative implementation during the last decades concerning the building energy efficiency. Indeed, it is well acknowledged that the present building stock is largely obsolete and inefficient: in the European context alone, around 75% of the buildings is not energy efficient and most are expected to be in use until 2050. Consequently, buildings require not only a general rehabilitation, to extend, or even avoid, its end-of-life time, but also a complete afterthought of their energy performance. That is extremely urgent to improve the overall sustainability of the construction sector that, alone, is one of the mai…
A weighted distance-based approach with boosted decision trees for label ranking
2023
Label Ranking (LR) is an emerging non-standard supervised classification problem with practical applications in different research fields. The Label Ranking task aims at building preference models that learn to order a finite set of labels based on a set of predictor features. One of the most successful approaches to tackling the LR problem consists of using decision tree ensemble models, such as bagging, random forest, and boosting. However, these approaches, coming from the classical unweighted rank correlation measures, are not sensitive to label importance. Nevertheless, in many settings, failing to predict the ranking position of a highly relevant label should be considered more seriou…
New Twists of 3D Chiral Metamaterials
2018
Rationally designed artificial materials, called metamaterials, allow for tailoring effective material properties beyond ("meta") the properties of their bulk ingredient materials. This statement is especially true for chiral metamaterials, as unlocking certain degrees of freedom necessarily requires broken centrosymmetry. While the field of chiral electromagnetic/optical metamaterials has become rather mature, the field of elastic/mechanical metamaterials is just emerging and wide open. This research news reviews recent theoretical and experimental progress concerning 3D chiral mechanical and optical metamaterials, with special emphasis on work performed at KIT.
Efficient pruning of multilayer perceptrons using a fuzzy sigmoid activation function
2006
This Letter presents a simple and powerful pruning method for multilayer feed forward neural networks based on the fuzzy sigmoid activation function presented in [E. Soria, J. Martin, G. Camps, A. Serrano, J. Calpe, L. Gomez, A low-complexity fuzzy activation function for artificial neural networks, IEEE Trans. Neural Networks 14(6) (2003) 1576-1579]. Successful performance is obtained in standard function approximation and channel equalization problems. Pruning allows to reduce network complexity considerably, achieving a similar performance to that obtained by unpruned networks.