Correlation between OCVD carrier lifetime vs temperature measurements and reverse recovery behavior of the body diode of SiC power MOSFETs

The reverse recovery (RR) behavior of SiC MOSFET body diode is of great importance in power application, where these devices are used in a wide range of operating temperatures. The carrier lifetime in the drift region varies with temperature, and it heavily affects the tailoring of the RR current, opening reliability issues related to the RR voltage amplitude and to possible anomalous voltage oscillations during the recovery. From the users' point of view, it would be useful to have a simple technique able to give predictive information about the body diode RR behavior of commercial devices over the whole range of working temperatures. An experimental-simulation approach is presented in this paper to correlate the carrier lifetime measured by simple OCVD measurements versus temperature with the RR behavior of the body diode, that can be useful at the design stage of power converters. Simulations of the body diode reverse-recovery are performed for a wide range of carrier lifetimes. This allows to estimate the effect of changes of carrier lifetime with temperature on the body diode switching transients. Preliminary results obtained with a 1700 V/5A commercial MOSFET are shown

A patient with immunological features of paraneoplastic pemphigus in the absence of a detectable malignancy.

3. Yotsumoto S, Setoyama M, Hisadome H, Tashiro M, 9. Yamasaki H, Tada J, Yoshioka T, Arata J. Epidermolysis Murata F. A case of epidermolysis bullosa herediteriabullosa pruriginosa (McGrath) successfully controlled by dominant dystrophic type of Cockayne and Touraine. oral cyclosporin. Br J Dermatol 1997; 137: 308–310. Dermatology 1993; 186: 201–204. 10. del-Rio E. Prevention of blisters in dystrophic recessive 4. Fine J-D, Eady RAJ, Bauer EA, Briggaman RA, Brucknerepidermolysis bullosa with cyclosporine. J Am Acad Tuderman L, Christiano A, et al. Revised classi cation Dermatol 1993; 29: 1038–1039. system for inherited epidermolysis bullosa: report of the 11. White JE. Minocycline for dystrophic epidermolysis bullosa. second international consensus meeting on diagnosis and Lancet 1989; 29; 8644: 966. classi cation of epidermolysis bullosa. J Am Acad Dermatol 12. Talas G, Adams TS, Eastwood M, Rubio G, Brown RA. 2000; 42: 1051–1066. Phenytoin reduces the contraction of recessive dystrophic 5. Burgeson RE. Type VII collagen, anchoring brils, and epidermolysis bullosa broblast populated collagen gels. Int epidermolysis bullosa. J Invest Dermatol 1993; 101: 252–255. J Biochem Cell Biol 1997; 29: 261–270. 6. Smith LT. Ultrastructural ndings in epidermolysis bullosa. 13. Shirakata Y, Shiraishi S, Sayama K, Shinmori H, Miki Y. Arch Dermatol 1993; 129: 1578–1584. High-dose tocopherol acetate therapy in epidermolysis bul7. Hovnanian A, Christiano AM, Uitto J. The molecular losa siblings of the Cockayne-Touraine type. J Dermatol genetics of dystrophic epidermolysis bullosa. Arch Dermatol 1993; 20: 723–725. 1993; 129: 1566–1570. 14. Caroll PB, Rilo HRL, Abu Elmagd K, Jhonson N, Carter 8. Shenefelt PD, Castellano LM, Fenske NA. Successful treatC,WrightH, et al. EVect of tacrolimus (FK506) in dystrophic ment of albopapuloid epidermolysis bullosa (Pasini's variant) epidermolysis bullosa: rationale and preliminary results. Arch with topical pulse corticosteroid therapy. J Am Acad Dermatol 1993; 29: 785–786. Dermatol 1994; 130: 1457–1458

Sistema di test automatizzato di pacchi batteria per trazione elettrica

Il lavoro di tesi si inserisce in un’attività di sviluppo di un banco prova automatizzato per l’esecuzione di vari tipi di test su accumulatori elettrochimici. Per motivi storici ed economici attualmente la maggior parte delle batterie al litio sono prodotte in paesi asiatici, ma da essi vengono importate anche in Europa per essere implementate in pacchi batteria con sistemi di controllo sviluppati in paesi dell’eurozona. Al fine di verificare e ottimizzare al meglio tali pacchi batteria si rendono necessarie ulteriori verifiche sulle celle importate, quindi la creazione di un banco prova nel quale sia possibile effettuare tali test risulta di fondamentale importanza. Il mio lavoro, descritto nella tesi, svoltosi presso il laboratorio LEMAD del dipartimento DEI, è stato quello di aggiungere e testare funzionalità più avanzate al banco prova e relativo algoritmo di controllo per il test di pacchi batteria. Nello specifico, nel capitolo 4, sarà descritta l’implementazione della gestione di un alimentatore controllato dal banco prova per permettere test su pacchi di capacità e potenze superiori a quelle che possono essere gestite con il sistema attuale. In più nel capitolo 5 sarà descritta la creazione di nuovi tipi di prove, effettuati in base alla carica scambiata con la batteria o cella in prova

Familial Lassueur-Graham-Little-Piccardi syndrome

Lassueur-Graham-Little-Piccardi syndrome (LGLPS) is a rare lichenoid dermatosis characterized by progressive cicatricial alopecia of the scalp, loss of pubic and axillary hairs and keratosis pilaris. The syndrome is considered a form of follicular lichen planus (LP). Although the familial occurrence of LP is a well-described phenomenon, no familial case of LGLPS has ever been reported. We describe the occurrence of LGLPS in a mother and her daughter. HLA typing revealed HLA-DR1 in both patients. Topical tacrolimus was of partial benefit in the daughter. Copyright © 2004 S. Karger AG, Basel

Il sistema economico-sociale della provincia di Modena: successi, trasformazioni e sfide

Il volume traccia il profilo del sistema economic della privincia di Modenaa. Delinea, inoltre, le trasfromazioni in corso