Varicella gangrenosa is a rare but life-threatening dermatological complication of infection with varicella-zoster virus. A healthy 37-year-old male who had been diagnosed with varicella 20 days back was admitted to our hospital with complaints of fever and painful necrotic skin lesions. Physical examination revealed multiple round to oval ulcers covered with eschar predominantly over arms, lower limbs, back of trunk and flanks. Streptococcus pyogenes and Staphylococcus aureus grew in wound culture. Biopsy revealed ulceration and necrosis of epidermis, and edema, hemorrhage and granulation tissue formation involving the dermis and subcutaneous tissue. The patient was treated with acyclovir - parenteral followed by oral, antibiotics and supportive measures. The lesions healed and he was discharged after 20 days. We report this case to draw attention to the fact that varicella gangrenosum, even though a rare complication, may occur in the lesions of chicken pox and that the survival of patient depends on early diagnosis and aggressive treatment.

Electric power generated from renewable source of energy is generally referred to as "Green power". There has been a renewed interest in wind energy in recent years because it is a potential source for electricity generation with minimal environmental impacts and with no cost of fuel. Nowadays, the main challenge in a Doubly Fed Induction Generator (DFIG) based wind electric conversion system is the proper maintenance of slip rings and brushes. Due to wear and tear, the slip rings and brushes of generator have to be frequently changed, which will be quite expensive. Also it will be very difficult to access them in the case of offshore wind farm. So, Brushless Doubly-Fed Induction Generator (BDFIG) was proposed to replace the traditional DFIG. Besides eliminating the slip rings and brushes, BDFIG has other advantages such as the improvement of reliability and cost effectiveness. This paper deals with mathematical modelling of BDFIG based Wind Electric Generator (WEG). Modelling is done for 50 kW WEG with the help of mathematical equations governing each component using MATLAB Simulink and the results are presented.

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