236 research outputs found
Static and transient electromagnetic features of the EFDA dipole
No full textThe EFDA dipole (EDIPO) is a superconducting
magnet made of a pair saddle-shaped winding packs enclosed in a
circular iron yoke which, in turn, is contained inside an austenitic
steel cylinder. In this paper the key electromechanical features of
the dipole are presented. As far as the static analysis is concerned,
the electromagnetic and mechanical behavior of the whole system
has been analyzed by means of finite element models, in order to
evaluate, in particular, the peak field on the cables, the stress limit
in the jacket and the shear stresses in the insulation. As far as
the transient analysis is concerned, the system behavior during a
current dump has been simulated by means of a coupled electromagnetic-circuit model that takes into account the non linearity
of the ferromagnetic material and the reaction field due to the
eddy currents in the steel cylinder. Another important element
in the AC analysis consists in the assessment of the conductor
losses during AC operation, since they provide the heat loads to be
evacuated by the cooling system. The results of this last issue are
also presented
The Value of Dignity in Prison: A Qualitative Study with Life Convicts
No full textBackground: This research is based on the perspective of dignity according to Chochinov; thus, the life imprisonment of detainees is assimilated to a severe disease. Methods: Ten male prisoners were interviewed trough Chochinov’s Dignity Therapy, and the results were analysed using thematic analysis. Results: Two areas of thematic prevalence emerged, namely, value of freedom, self-consciousness and education and their failure in jail, and life sentence as annihilation of life meaning and of the values of generativity and family. Conclusions: Life imprisonment has been described in its negativity by several respondents as a punishment worse than the death penalty. It has been compared to death itself, to a terminal illness, to torture and to a pain that grows over the years, with the awareness that despite the passing of time, you will not have the opportunity to return to your loved one and to a free life. In fact, prisoners live out their condition within a space in which any value that gives meaning to life risks being destroyed
Artificial neural networks for non-destructive evaluation with ultrasonic waves in not accessible pipes
No full textAbstract— The design of Non-Destructive Testing systems for
fault detection in long and not accessible pipelines is an actual
task in the industrial and civil environment. At this purpose the
diagnosis based on the propagation of guided ultrasonic waves
along the pipes offers an attractive solution for the fault
identification and classification. The authors studied this
problem by means of suitable Artificial Neural Network models.
Numerical techniques have been used to model different kinds of
pipes and faults, and to obtain several returning echoes
containing the fault information. These signals have been
processed to filter the noise by using Wavelets e Blind Separation
methods and passed to a feature extractor system, whose purpose
is to reduce the data dimensionality and to compute suitable
features. The features selected from the signals have been further
processed in order to limit the size of the Neural Network models
without loss of information. At this purpose, the Garson’s
method and the Principal Component Analysis have been
investigated and compared. Finally, the extracted features have
been used as input for the Neural Network models. In this paper,
traditional feed-forward, Multi Layer Perceptron networks have
been used to classify position, width, and depth of the defects
FEM electromagnetic analysis and thermal-fluid dynamics analysis of gaseous He cooling for the capacitive tuner of the ITER ICRH antenna
No full text
Cardioprotection by A3 adenosine agonists: role of sarcoplasmic reticulum calcium release
No full textA3 adenosine receptor stimulation modulates sarcoplasmic reticulum Ca2+ release in rat heart
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