Power semiconductors-a new method for predicting the on-statecharacteristic and temperature rise during multicycle faultcurrents

Solid-state switches are being designed for use on AC transmission lines for tighter control of power flow and increased use of transmission capacity in accordance with an advanced concept called “Flexible AC Transmission System” (FACTS). These necessitate using the largest available thyristors and GTOs that must perform under emergency fault conditions with assurance of long term reliability and life expectancy. This paper is concerned with reviewing concepts needed to predict on-state losses incurred at extreme variations of junction temperature and describing an empirical method being used for commercially available 100 mm thyristors     

A variant of xeroderma pigmentosum: two cases of pigmented xerodermoid

Two patients (sister and brother) of pigmented xerodermoid are presented: the character of clinical signs (phothosensitivity, poikilodermia, keratoses and keratomas, furthermore in the brother the squamous cell epithelioma of left thigh), according to them the case history (appearance of precancerous conditions and carcinoma in early adult life) made the disease suspicious to a variant of xeroderma pigmentosum. A DNA reparation test was also carried out, which confirmed the above clinical diagnosis in both patients.     

New insights into the failure mechanism and dynamic process of the Boli landslide,China

Bulletin of Engineering Geology and the Environment - The study of landslide initiation mechanisms and dynamic process analysis is important for monitoring, predicting, and controlling landslide...