897 research outputs found
La unidad de la verdad en el acceso a Dios: ciencia, razĂłn y fe
La encĂclica Fides et ratio, al
ocuparse principalmente de la relaciĂłn
entre filosofĂa y teologĂa, parecerĂa
no alegar especĂficas conclusiones
acerca del saber cientĂfico. Sin embargo,
la referencias que el texto dedica
tanto a las ciencias naturales como a la
actividad del investigador son suficientes
para concluir que la ciencia
participa del acceso a la misma y Ăşnica
verdad y no es extraña al tránsito
desde el fenĂłmeno al fundamento que
la encĂclica indica como exigencia originaria
del conocimiento humano
An analytical formulation to evaluate natural frequencies and mode shapes of high-rise buildings
In this paper, an original analytical formulation to evaluate the natural frequencies and mode shapes of high-rise buildings is proposed. The methodology is intended to be used by engineers in the preliminary design phases as it allows the evaluation of the dynamic response of high-rise buildings consisting of thin-walled closed- or open-section shear walls, frames, framed tubes, and diagrid systems. If thin-walled open-section shear walls are present, the stiffness matrix of the element is evaluated considering Vlasov’s theory. Using the procedure called General Algorithm, which allows to assemble the stiffness matrices of the individual vertical bracing elements, it is possible to model the structure as a single equivalent cantilever beam. Furthermore, the degrees of freedom of the structural system are reduced to only three per floor: two translations in the x and y directions and a rigid rotation of the floor around the vertical axis of the building. This results in a drastic reduction in calculation times compared to those necessary to carry out the same analysis using commercial software that implements Finite Element models. The potential of the proposed method is confirmed by a numerical example, which demonstrates the benefits of this procedure
A Cognitive Social IoT Approach for Smart Energy Management in a Real Environment
Energy usage inside buildings is a critical problem, especially considering high loads such as Heating, Ventilation and Air Conditioning (HVAC) systems: around 50% of the buildings’ energy demand resides in HVAC usage which causes a significant waste of energy resources due to improper uses. Usage awareness and efficient management have the potential to reduce related costs. However, strict saving policies may contrast with users’ comfort. In this sense, this paper proposes a multi-user multi-room smart energy management approach where a trade-off between the energy cost and the users’ thermal comfort is achieved. The proposed user-centric approach takes advantage of the novel paradigm of the Social Internet of Things to leverage a social consciousness and allow automated interactions between objects. Accordingly, the system automatically obtains the thermal profiles of both rooms and users. All these profiles are continuously updated based on the system experience and are then analysed through an optimization model to drive the selection of the most appropriate working times for HVACs. Experimental results in a real environment demonstrated the cognitive behaviour of the system which can adapt to users’ needs and ensure an acceptable comfort level while at the same time reducing energy costs compared to traditional usage
Leave-one-out prediction error of systolic arterial pressure time series under paced breathing
In this paper we show that different physiological states and pathological
conditions may be characterized in terms of predictability of time series
signals from the underlying biological system. In particular we consider
systolic arterial pressure time series from healthy subjects and Chronic Heart
Failure patients, undergoing paced respiration. We model time series by the
regularized least squares approach and quantify predictability by the
leave-one-out error. We find that the entrainment mechanism connected to paced
breath, that renders the arterial blood pressure signal more regular, thus more
predictable, is less effective in patients, and this effect correlates with the
seriousness of the heart failure. The leave-one-out error separates controls
from patients and, when all orders of nonlinearity are taken into account,
alive patients from patients for which cardiac death occurred
Exocytosis of peptide functionalized gold nanoparticles in endothelial cells
We present the exocytosis profile of two types of peptide-coated nanoparticles, which have similar charge and size but different functionality. While one kind of particles appears to progressively exocytose, the other one has a more complex profile, suggesting that some of the particles are re-uptaken by the cells. Both types of particles retain their colloidal stability after exocytosis
Numerical methods for fluctuation driven interactions between dielectrics
We develop a discretized theory of thermal Casimir interactions to
numerically calculate the interactions between fluctuating dielectrics. From a
constrained partition function we derive a surface free energy, while handling
divergences that depend on system size and discretization. We derive analytic
results for parallel plate geometry in order to check the convergence of the
numerical methods. We use the method to calculate vertical and lateral Casimir
forces for a set of grooves.Comment: revtex, 20 page
A subjective model for trustworthiness evaluation in the social Internet of Things
The integration of social networking concepts into the Internet of Things (IoT) has led to the so called Social Internet of Things (SIoT) paradigm, according to which the objects are capable of establishing social relationships in an autonomous way with respect to their owners. The benefits are those of improving scalability in information/service discovery when the SIoT is made of huge numbers of heterogeneous nodes, similarly to what happens with social networks among humans. In this paper we focus on the problem of understanding how the information provided by the other members of the SIoT has to be processed so as to build a reliable system on the basis of the behavior of the objects. We define a subjective model for the management of trustworthiness which builds upon the solutions proposed for P2P networks. Each node computes the trustworthiness of its friends on the basis of its own experience and on the opinion of the common friends with the potential service providers. We employ a feedback system and we combine the credibility and centrality of the nodes to evaluate the trust level. Preliminary simulations show the benefits of the proposed model towards the isolation of almost any malicious node in the network
La relaciĂłn entre filosofĂa y teologĂa en M.J.Scheeben. Desde el modelo de la ancilaridad hacia una analogĂa encarnacionista
Determination of a pre-heating sequence for the DONES Target Assembly
Within the activities promoted by the EUROfusion consortium in support of the design and construction of the
DEMO Oriented NEutron Source (DONES), a mock-up of its Target Assembly (TA), based on the configuration
with a “bayonet” Back-Plate (BP) and available at ENEA Brasimone labs, is being adopted for the execution of
experimental activities aiming at the validation of specific aspects of the target design.
Despite the “integral”-TA concept is the current reference, experimental tests concerning the TA pre-heating
phase are not significantly affected by the TA concept and are still representative even though conducted on
the bayonet-TA concept. Indeed, the main objective of the pre-heating phase is to raise the TA temperature up to
a value close to that of the lithium flow in nominal condition (250 â—¦C). In particular, one of the main concerns is
to keep the BP at a temperature higher than 200 â—¦C to avoid possible local lithium freezing.
In order to support the afore-mentioned tests, a numerical research campaign has been launched by ENEA
Brasimone in collaboration with the University of Palermo with the goal of determining an optimal design of the
electrical heaters, both in terms of temperature set-points and geometrical layout. To this purpose, several
configurations have been assessed following a theoretical-computational approach based on the Finite Element
Method (FEM) and adopting the Abaqus FEM code. In a first phase, different electric heater layouts were assessed
by means of steady state thermal analyses. Once the most promising scenario was selected, a detailed thermal
transient analysis was carried out. An iterative procedure, based on the analysis of the maximum temperature
achieved within the mock-up most critical components, was followed in order to determine the duty cycle of the
electric heaters. The obtained numerical results are herewith reported and critically discussed
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