1,721,025 research outputs found
A statistical assessment of silica levels and lung cancer
No full textSi presenta una analisi statistica su pazienti affetti e non affetti da cancro al polmone, allo scopo di confrontare i livelli di silicio presenti nel tessuto polmonare. Si utilizzano modelli di regressione di Poisson e la discussione si focalizza su aspetti metodologici legati a tali modelli, quali eteroschedasticita`, sovradispersione, tecniche di diagnostica e predizione
Effects of RFI and Underground Currents on a Smart Power Bandgap Voltage Reference
No full textThe effects on a band gap voltage reference circuit of a radio frequency conducted disturbing signal superimposed to the supply voltage are evaluated. The variations of the dc output voltage are investigated for different frequency and amplitude of the interfering signal. A dedicated PCB for the measurements is developed paying attention to careful HF layout. Also, the impact of substrate currents on the IC’s behaviour is studied. The paper gives an analysis of the results obtained by measurements and simulation, focusing on the key macroscopic effects. A good agreement between simulations and measurements is found. At the end, a modified schematic based on simulation results is proposed to improve the immunity of the bandgap circuit
Focal Myositis in paediatric age.
Full text linkBACKGROUND: Focal Myositis is a rare pseudotumor of unknown aetiology that is often difficult to diagnose and treat. Typically afflicting people in adulthood, it has occasionally been reported also among children.
PURPOSE: the aim of this study is to review the literature of Focal Myositis in paediatric age in order to compare the clinical manifestation and the various treatment suggested by different authors.
METHODS: this article describes a 6-year-old boy with focal myositis in gracilis muscle successfully treated by conservative methods, including nocturnal leg traction, intensive physiokinesi therapy and articulated knee orthosis guided to progressive extension. Furthermore a systematic review of literature concerning focal myositis in paediatric age is reported.
CONCLUSION: our case and the review of literature suggests that conservative methods should be the first-choice treatment for FM in paediatric age and that surgery should be strictly reserved for selected cases where non-invasive methods have previously faile
Effects of Radio Frequency Interference in OPAMP Differential Input Stages
No full textThe paper deals with the problem of RFI induced output dc offset in operational amplifiers. In particular, it presents an extended analysis of the effect of the input differential stage nonlinearity in the generation of the output voltage offset. Differently from previously presented analyses, the proposed approach allows to take into account the effects of non purely square-law device models, e.g. including also velocity saturation effects. The paper also analyzes the common emitter differential input pair the analysis results can be easily extended to represent sub-threshold biased MOSFET differential stages. Based on the proposed analytical approach the paper discusses two very simple design provisions that mitigate the RFI effects. Design trade-offs related to these solutions are discussed. The proposed solutions are validated by simulations
A statistical assessment of silica levels and lung cancer
No full textSi presenta una analisi statistica su pazienti affetti e non affetti da cancro al polmone, allo scopo di confrontare i livelli di silicio presenti nel tessuto polmonare. Si utilizzano modelli di regressione di Poisson e la discussione si focalizza su aspetti metodologici legati a tali modelli, quali eteroschedasticita`, sovradispersione, tecniche di diagnostica e predizione
Mental Health Services in Lombardy during COVID-19 outbreak
No full textLombardy is the Region in Italy the most heavily affected by coronavirus disease (COVID-19) contagion. The Regional Health Authority mandates that mental health services should be guaranteed, identifying mental health as a priority for their citizens. Recommendations for occupational and health safety have been provided to patients and hospital staff, including support for telemedicine activities and remote psychosocial interventions. Services of the Mental Health Departments of Milano “Niguarda” and Brescia “Spedali Civili” Hospitals are providing continued care at a community, residential and hospital level, and to positive COVID-19 psychiatric patients in need of hospitalization
A Single-Sensor-Based Circulating Current Controller for a Modified Three-level Modular Multilevel Converter
No full textA voltage controller for the middle capacitor of a modified modular multilevel converter (MMC) is proposed in this paper. This controller is utilized as an alternative solution to the existing circulating current controller. Unlike the circulating current controller, the second-order harmonic component of the circulating current is regulated indirectly by controlling the second-order component of the middle capacitor voltage. Using this approach, only one voltage sensor per phase is needed instead of two current sensors. The validity of the proposed control is proved by simulation and experimental results
Outcome delle fratture di olecrano in pazienti con immaturità scheletrica : riduzione a cielo aperto e sintesi con tirante versus riduzione a cielo chiuso e sintesi con vite percutanea
No full textSusceptibility of Integrated circuits to RFI: analysis of PWM current-mode controllers for snips
No full textThree-Phase Modular Multilevel Converter with Optimized Capacitor Sizing for Low-Voltage Applications
No full textHigh capacitance requirement is a major concern of modular multilevel converters (MMCs) when applied to medium- or low-voltage systems. This article presents the design procedure and development of a modified MMC topology for low-voltage applications. With respect to the conventional MMC topologies, the proposed structure is designed and optimized to have a relatively low capacitance requirement. The switching states, modulation, control, and design procedure of the different parameters, including submodule capacitor and arm inductor, are investigated in this article. Moreover, the control scheme is presented to achieve regulation of the output voltage and the circulating current. The outcomes of this study are verified by simulation and experimental results
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