Background: Psoriasis is a common and genetically determined skin disease, which is frequent throughout the world. Objective: To perform a descriptive clinical study of 200 cases of psoriasis in Ahwaz. Patients and Methods: This study was performed from November 1997 to April 1999 on 200 psoriatic patients attended a private skin clinic in Ahwaz. Data were collected from patients and entered in...

This paper investigates the punch-through phenomenon in SiC Schottky Barrier Diodes (SBD) from capacitance–voltage (C–V) characteristics at high reverse bias voltage. High voltage bias application has not been possible by conventional measurement instrumentation. The authors, therefore, develop C–V characteristics measurement instrumentation which enables the application of high dc bias voltage...

Components of drain leakage currents in the off-state of MOSFET are gate-induced drain-leakage (GIDL) and drain junction reverse currents. Device degradation phenomenon and mechanism by GIDL have been well known, but those by drain junction reverse current (IDJR). have not. In this paper, device degradation mechanisms by drain junction reverse current in the off-state were studied through I-V c...

This paper presents the experimental observation of the degradation in asymmetric sampled grating DFB lasers by the accelerated life tests. Two degradation phenomena related to the electrical characteristics of LDs are observed during the tests. The first degradation phenomenon by increasing the reverse current is considered as a formation of leakage current path enough to prevent lasing operat...

economic recession is considered as a repeatable and constant phenomenon in capitalist economy. countries which experienced rapid economic growth have inevitably applied a balancing program after that. generally, whenever industrial, financial and commercial developments occurred in a rapid growth, the reverse and changing processes would appear. consequently, they will affect the financial and...