The AC response measurement system is presented. System structure, operation and main units operation are described. The connection setup for a few most common tasks is presented. The obtained results are given. It has been indicated that AC response can be investigated for ultrasonic preamplifier, matching transformer, system filters and ultrasonic transducers. The system is controlled by a pe...

In which it is proposed that a single mathematical operation – determining compositions of transformational mappings – underlies the common cortical neuroanatomy of brain areas responsible for vision, motor and thought. A biologically plausible mechanism that implements this mathematical operation is called the map-seeking circuit.

Description logics are a popular formalism for knowledge representation and reasoning. This paper introduces a new operation for description logics: computing the “least common subsumer” of a pair of descriptions. This operation computes the largest set of commonalities between two descriptions. After arguing for the usefulness of this operation, we analyze it by relating computation of the lea...

We exhaustively investigate possible combinations of a boolean operation together with a catenation. In many cases we prove and improve some conjectures by Brzozowski. For each family of operation, we endeavour to provide a common witness with a small size alphabet.

introduction eating disorders and morbid obesity have become common over the recent years. laparoscopic gastric bypass surgery is known as one of the most effective methods for weight loss. due to the rarity of studies regarding the association of depression and surgery, we aimed to compare the levels of depression in patients with excessive obesity before and after gastric bypass surgery. conc...

BACKGROUND Esophageal atresia (EA) is a common congenital anomaly. In this study, we evaluated the mortality and its risk factors in patients born with esophageal atresia. METHODS AND MATERIALS A database of 206 consecutive patients treated for EA was developed in ST-Zahra hospital of Isfahan between 1994 and 2004. RESULTS In this study, 206 patients were evaluated. The most common type of ...

acute appendicitis is the most common condidition, requiring emergency operation in children. late appendicitis is still a major sours of morbidity and potential mortality. the charts of all pediatric appendectomy patients (150 cases) treated between 1367-1373 (iranian calender) in amir kabir medical center were reviewed. mean hospital stay was 4.7 days. mean ages of patients was 8.5 years. mal...

Initial intensive combined chemotherapy, with late re-operation when indicated, appears to give better results than immediate excision of the infected valve. The combination chemotherapy used in this series was amphotericin B (up to 100 mg/patient/day) and flucytosine (up to 12 g/patient/day). Serious side effects attributed to this chemotherapy were extremely rare. Candida infections were the ...