14,391 research outputs found
Right Atrial Size and Function in Patients with Pulmonary Hypertension Associated with Disorders of respiratory System or Hypoxemia
Left Atrial Systolic Force: Comparison Between Two Methods for the Noninvasive assesment of Left Atrial Systolic Function
A nonparametric approach for model individualization in an artificial pancreas
The identification of patient-tailored linear time invariant glucose-insulin models is investigated for type 1 diabetic patients, that are characterized by a substantial inter-subject variability. The individualized linear models are identified by considering a novel kernel-based nonparametric approach and are compared with a linear time invariant average model in terms of prediction performance by means of the coefficient of determination, fit, positive and negative max errors, and root mean squared error. Model identification and validation are based on in-silico data collected from the adult virtual population of the UVA/Padova simulator. The data generation involves a protocol designed to produce a sufficient input excitation without compromising patient safety, compatible also with real life scenarios. The identified models are exploited to synthesize an individualized Model Predictive Controller (MPC) for each patient, which is used in an Artificial Pancreas to maintain the blood glucose concentration within an euglycemic range. The MPC used in several clinical studies, synthesized on the basis of a non-individualized average linear time invariant model, is also considered as reference. The closed-loop control performance is evaluated in an in-silico study on the adult virtual population of the UVA/Padova simulator in a perturbed scenario, in which the MPC is blind to random variations of insulin sensitivity in each virtual patient. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved
Mesoscopic continuous and discrete channels for quantum information transfer
We study the possibility of realizing perfect quantum state transfer in
mesoscopic devices. We discuss the case of the Fano-Anderson model extended to
two impurities. For a channel with an infinite number of degrees of freedom, we
obtain coherent behavior in the case of strong coupling or in weak coupling
off-resonance. For a finite number of degrees of freedom, coherent behavior is
associated to weak coupling and resonance conditions
Nonequilibrium critical scaling from quantum thermodynamics
The emerging field of quantum thermodynamics is contributing important
results and insights into archetypal many-body problems, including quantum
phase transitions. Still, the question whether out-of-equilibrium quantities,
such as fluctuations of work, exhibit critical scaling after a sudden quench in
a closed system has remained elusive. Here, we take a novel approach to the
problem by studying a quench across an impurity quantum critical point. By
performing density matrix renormalization group computations on the
two-impurity Kondo model, we are able to establish that the irreversible work
produced in a quench exhibits finite-size scaling at quantum criticality. This
scaling faithfully predicts the equilibrium critical exponents for the
crossover length and the order parameter of the model, and, moreover, implies a
new exponent for the rescaled irreversible work. By connecting the irreversible
work to the two-impurity spin correlation function, our findings can be tested
experimentally.Comment: 6 pages, 4 figure
HOW FLEXIBLE CLASSROOM CAN IMPROVE SEAMLESS LEARNING
This paper will describe the way flexible classroom, started at primary school, can effectively promote seamless
learning in adulthood. From this point of view, a flexible classroom experience for children can become a toolbox
to use in their future to face seamless learning and smart working. This work shows that flexibility and adaptation
to change are propaedeutic to improve the scheduling and the selection process of learning spaces and times. To
support this research, a questionnaire was filled in by one hundred eighty-three students of the University of Sannio
in Benevento, Italy
Investigation and monitoring in support of the structural mitigation of large slow moving landslides: an example from Ca' Lita (Northern Apennines, Reggio Emilia, Italy)
International audienceThe Ca' Lita landslide is a large and deep-seated mass movement located in the Secchia River Valley, in the sector of the Northern Apennines falling into Reggio Emilia Province, about 70 km west of Bologna (Northern Italy). It consists of a composite landslide system that affects Cretaceous to Eocene flysch rock masses and chaotic complexes. Many of the components making up the landslide system have resumed activity between 2002 and 2004, and are now threatening some hamlets and an important road serving the upper watershed area of River Secchia, where many villages and key industrial facilities are located. This paper presents the analysis and the quantification of displacement rates and depths of the mass movements, based on geological and geomorphological surveys, differential DEM analysis, interpretation of underground stratigraphic and monitoring data collected during the investigation campaign that has been undertaken in order to design cost-effective mitigation structures, and that has been conducted with the joint collaboration between public offices and research institutes
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