Dual-PEEC Modeling of a Two-Port TEM Cell for VHF Applications

Two-port TEM cells with rectangular cross section are commonly used to produce plane electromagnetic waves with high electric field. The non-uniform structure makes the use of numerical methods extremely useful in the design phase in order to achieve a very good behavior of the TEM cell over a wide frequency range of operation. In this paper an extended version of PEEC is used to study a real device and results are compared with experimental ones

A Source Identification Problem for the Electrical Activity of Brain During Hand Movement

A field source reconstruction of the dipoles modeling the activated area of the brain, while a subject performs the task of the voluntary motion of the hand, is solved. Experimental data resulting from fMRI are used for constraining the position of the equivalent dipole

Monitoring Network Flows in Containerized Environments

With the progressive implementation of digital services over virtualized infrastructures and smart devices, the inspection of network traffic becomes more challenging than ever, because of the difficulty to run legacy cybersecurity tools in novel cloud models and computing paradigms. The main issues concern i) the portability of the service across heterogeneous public and private infrastructures, that usually lack hardware and software acceleration for efficient packet processing, and ii) the difficulty to integrate monolithic appliances in modular and agile containerized environments. In this Chapter, we investigate the usage of the extended Berkeley Packet Filter (eBPF) for effective and efficient packet inspection in virtualized environments. Our preliminary implementation demonstrates that we can achieve the same performance as well-known packet inspection tools, but with far less resource consumption. This motivates further research work to extend the capability of our framework and to integrate it in Kubernetes

An architecture to manage security services for cloud applications

The uptake of virtualization and cloud technologies has pushed novel development and operation models for the software, bringing more agility and automation. Unfortunately, cyber-security paradigms have not evolved at the same pace and are not yet able to effectively tackle the progressive disappearing of a sharp security perimeter. In this paper, we describe a novel cyber-security architecture for cloud-based distributed applications and network services. We propose a security orchestrator that controls pervasive, lightweight, and programmable security hooks embedded in the virtual functions that compose the cloud application, pursuing better visibility and more automation in this domain. Our approach improves existing management practice for service orchestration, by decoupling the management of the business logic from that of security. We also describe the current implementation stage for a programmable monitoring, inspection, and enforcement framework, which represents the ground technology for the realization of the whole architecture

An off-shell I.R. regularization strategy in the analysis of collinear divergences

We present a method for the analysis of singularities of Feynman amplitudes based on the Speer sector decomposition of the Schwinger parametric integrals combined with the Mellin-Barnes transform. The sector decomposition method is described in some details. We suggest the idea of applying the method to the analysis of collinear singularities in inclusive QCD cross sections in the mass-less limit regularizing the forward amplitudes by an off-shell choice of the initial particle momenta. It is shown how the suggested strategy works in the well known case of the one loop corrections to Deep Inelastic Scattering.Comment: 25 pages, 3 figure

Wind tunnel tests of a hexadecagonal cylinder with imperfections and ancillaries: aerodynamic characterization and technical discussion

This paper evaluates and discusses the aerodynamic properties of a 16-sided polygonal cylinder with imper- fections and ancillaries investigated by wind tunnel tests. Two sectional models with different size have been realized, reproducing the peculiarities of real structures, such as the rounded corners, local protuberance due to weld bead, cables, ducts and the external ladder. The models have been subjected to static tests to measure the mean force coefficients and the Strouhal number varying angle of attack, flow velocity, turbulence intensity focusing on the effects of the imperfections and ancillaries on the aerodynamic loads with consideration of Reynolds number effects. The results provide an estimate of the aerodynamic coefficients for this type of ele- ments, quantify the influence of geometrical and flow properties on the aerodynamic behaviour and point out the sensitivity of such polygonal cross-section to galloping instability

NEETs in Latin America and the Caribbean: Skills, Aspirations, and Information

This paper studies the role of cognitive skills, socioemotional skills, aspirations and expectations on the likelihood of being NEET (not in education, employment or training) using a novel sample of 15 to 24 year old residents of seven Latin American and Caribbean countries. After controlling for sociodemographic household conditions, we find that numeracy and literacy skills, core self‐evaluation, extraversion and educational aspirations are robust correlates of being NEET. We also find cross country heterogeneity. That is, in some countries, passion and perseverance for long‐term goals, neuroticism and labour market information biases are additional factors associated with being NEET

The annual rate of independent events - A key interpretation for traditional extreme value distributions of wind velocity

The extreme value theory has been object of engineering studies for more than a century. The analysis of extreme winds plays a key role for complex civil structures and a driving role in different stages of wind turbines lifetime. Most of extremes probability models depend on the annual rate of independent events (ARIE) which has been traditionally considered a constant value. The authors have embraced a recent belief considering the ARIE as a function of the wind velocity. Even though a certain agreement has been achieved across the researches, some issues are still pending. In this regard, the paper shows that the annual, seasonal and daily fluctuations embedded in time series of the mean wind speeds, constrain its probability distribution and time correlation to be physically consistent. Besides, a new physical interpretation of the ARIE is presented, expressing how the independence across wind observations increases with the wind speed, up to the point that all yearly observations are independent if larger than a suitable speed value. Such a tendency is not revealed if the annual, seasonal and daily fluctuations are excluded by the analysis, leading to a deceitful shape of the ARIE. Finally, the paper shows how the velocity-dependent ARIE model is consistent with the conventional asymptotic extreme value theory, if a sufficiently large left-censorship applies to the dataset. The study of the ARIE presented in this paper is based on long-term Monte Carlo simulation of the mean wind speed

Application of CFD and mass-consistent models for operational wind forecasting

In the context of the San Paolo project "Wind monitoring, simulation and forecasting for the smart management and safety of port, urban and territorial system", a computational grid of Livorno City (Italy) and its surroundings at full scale has been constructed for 3D steady-state RANS simulations to be performed by the open-source code OpenFOAM. Field measurements in the same urban area have been scheduled between December 2017 and March 2018 in order to cover the entire winter season, i.e. the windiest one. The CFD results, obtained by initialising the CFD simulations with wind profiles measured through a LiDAR installed in the Port of Livorno, have been validated by means of two ultrasonic three-axial anemometers installed along a narrow canal which is located in the old city centre, about 1.5 km south-westward of the port area

Efficienza dei servizi sanitari ed utilizzo ottimale delle risorse. Una applicazione al Policlinico Universitario di Cagliari

l’applicazione del nomogramma di Barber, che può essere impiegato nel controllo della gestione di un dato reparto ospedaliero considerando le diverse patologie (DRG) che ad esso afferiscono sia per effettuare analisi di tipo descrittivo e/o investigativo relativamente ai singoli DRG sia per condurre indagini diacroniche finalizzate a cogliere quali siano state le variazioni del livello di efficienza nel corso del tempo dei reparti e/o delle varie patologie. In ultima analisi l’utilizzazione del modello quale strumento di valutazione della gestione delle attività sanitarie