196,464 research outputs found
Control of PMSMs with Double Loop Data-Driven Techniques
No full textIn this paper the data driven technique known as Model-Free Adaptive Control is applied to the speed tracking problem for a Permanent Magnet Synchronous Motor. Inspired by previous literature, a novel theoretical analysis is here presented allowing to consider time-varying reference variables for the motor. In particular a stability analysis is proposed, proving the boundedness of the tracking error and the Bounded-Input-Bounded-Output stability of the closed-loop system for two different double loop control configurations. Simulation results are reported showing the effectiveness of the proposed approaches. This work is a preliminary study preceding the experimental validation of the proposed control solutions, currently ongoing
Neuroimaging examinations of newborns in vertically acquired infections.
No full textCongenital/perinatal nervous system (CNS) infections are an
important cause of mortality and morbidity in neonatal period,
and long-term sequelae. Many pathogens can lead to infections
frequently involving the CNS, with possible disruption of
brain development, which often is related to gestational age of
maternal infection. The mechanism of infection and damage is
different among the infectious agents, leading to more specific
pathologic findings. It is necessary in newborns with confirmed
or suspected CNS infection to undergo investigation by neuroimaging
techniques to help healthcare providers, give adequate
treatment and follow-up care and counsel parents. Computed
tomography, Magnetic Resonance Imaging and cerebral ultrasonography
are fundamental tools in evaluating infants with
suspected or proved congenital/perinatal infections. Each
imaging technique has its advantages, disadvantages and limits,
since they are sometimes complementary
On the experimental determination of strength and deformation characteristics of timber-concrete composite joints
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Variations among Italian isolates of the Heterobasidion annosum P group detected using the M13 minisatellite
No full textHeterobasidion annosum growth (ISG F, P and S) after pathogenicity test on Abies alba and Picea abies, in Italian Alps
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Neonatal arterial iliac thrombosis in type-I protein C deficiency: a case report
No full textAbstract A male infant born by caesarean section at 38 weeks of gestational age (B.W. 4055 g; Apgar 9-10), in the first two hours of life his right leg became hypovascularizated. Normal values of leukocities, red cells, haematocrit, hemoglobin, platelets. C-Reactive Protein negative. Electrolytes and coagulation tests were normal. Normal vitamin K coagulation proteins levels. Serological tests for TORCH (IgM) and Parvovirus (IgG and IgM) were negative. Sonography showed a reduced blood flow in the iliac artery and reported a 1 cm long vessel thrombosis. From 8 hours of life we administred an intravenous infusion of unfractionated heparin (UFH) 75 UI/Kg for the first 10 minutes then 28 UI/Kg/h. On the 2nd day tests were performed to assess absence of inhibiting-clot factors. The dosage of homocysteine, protein S and antithrombin was normal. FV Leiden and antiphospholipid antibodies were negative. The mapping of G20210A prothrombin's gene resulted normal, whereas the concentration of Protein C was lower than normal: activity 46% (68-150%), antigen 35% (70-150%). The same deficiency was also found in the father. The mother showed normal concentrations. No episodies of thrombosis events were documentated in the family. The intravenous unfractionated heparin (UFH) therapy was replaced after 64 hours by subcutaneous nadroparin 600 UI twice/day, which was stopped 5 days later when the vessel sonografic images were completely normal. During the hospitalization the infant didn't show bleeding. The child was followed-up yearly until 4 years of age: he was well and had a normal body and mental development. The final diagnosis is likely to be of a permanent protein C deficiency in heterozygous form. Our case is interesting because the first manifestation was an important thrombosis of large vessel that occurred within a few hours of life in absence of perinatal risk factors, as if it was a homozygous disease, but the patient had a heterozygotic form. In literature few cases are reported of heterozygous forms that became symptomatic, but only in old age. After a severe first manifestation, a normal and asymptomatic development is uncommon without new thrombotic episodes. In our patient the neonatal thrombosis was the sole event in his life.</p
Sakacin-A antimicrobial packaging for decreasing Listeria contamination in thincut meat: preliminary assessment
No full textBACKGROUND: Minimally processed ready-to-eat products are considered a high-risk food because of the possibility of contamination with pathogenic bacteria, including Listeria monocytogenes from the animal reservoir, and the minimal processing they undergo. In this study, a sakacin-A anti-Listeria active package was developed and tested on thin-cut veal meat slices (carpaccio). RESULTS: Enriched food-grade sakacin-A was obtained from a cell-free supernatant of a Lactobacillus sakei culture and applied (0.63 mg cm−2) onto the surface of polyethylene-coated paper sheets to obtain an active antimicrobial package. The coating retained antimicrobial features, indicating that the process did not affect sakacin-A functionality, as evidenced in tests carried out in vitro. Thin-cut veal meat slices inoculated with Listeria innocua (a surrogate of pathogenic L. monocytogenes) were laid on active paper sheets. After 48 h incubation at 4 °C, the Listeria population was found to be 1.5 log units lower with respect to controls (3.05 vs 4.46 log colony-forming units (CFU) g−1). CONCLUSION: This study demonstrates the possibility of using an antimicrobial coating containing sakacin-A to inhibit or decrease the Listeria population in ready-to-eat products, thus lowering the risk of food-related diseases
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