In this paper a new approach for design of CLASS-AB current-mode square-root domain filters based on the electronically simulated translinear loop principle is presented. FG-MOS transistors that operate in strong inverted saturation region are employed for implementation of translinear loop circuit. The filter achieves immunity to body effect, low circuit complexity, large input dynamic range, and also works in low voltage compared to those reported before. With supply voltage 1.2V a dynamic range of 46dB at 1% THD is achieved. Simulation results by HSPICE confirm the validity of the proposed design technique and show high performance of the filter.

Background: Chronic autoimmune thyroiditis (Hashimoto's Thyroiditis) is the common cause of primary hypothyroidism in iodine sufficient countries. Iran is named an iodine sufficient country, in this century. Methods: A total of 88 hypothyroid patients, on suppressing dose of levothyroxine who were followed in a university endocrine disorder clinic were evaluated for serum thyroid autoimmunity markers: thyroid peroxidase antibody (TPO Ab), thyroglobulin antibody (Tg Ab) and thyroid microsomal antibody (TM Ab) using ELISA method. Results: The prevalence of TPO Ab, Tg Ab and TM Ab were 73.9%, 45.5% and 71.6%, respectively. Among the patients with high level of TPO Ab (> 75 u/ml), 45.3% had grade 1 or 2 of goiter (p< 0.05). Conclusion: Autoimmune thyroid disease (Hashimoto's thyroiditis) is the most common cause of  hypothyroidism in Bushehr province.

Naghshe Bar Ab zadan has proved as one of the puzzling interpretations in Hafizs poetry. Considering the history of this interpretation and the fresh sense attached to it by Hafizs magic skill, it is worth reading and exploring, specially due to the fact that the existing published literature has overlooked some aspects of this concept. The author intends to reconsider it in order to facilitate the perception of some aesthetic aspects of Hafizs poetry. To this end, quite inevitably, the present researcher presents some evidence in order to emphasize his approach and intention and to clarify some prevailing misinterpretations.

Ponds, which are called Ab-bandans in mazindaran province, are valuable samples of native knowledge and technology of the people of this region for the optimum use of water. These aquatic systems are used for agricultural water storage and recharge of springs and underground waters, also from ecological points of view, provide habitats for birds and wild life, protection of bio-diversity, gene banks, creation of beautiful landscapes and several other benefits. The ponds of north of Iran are in danger of degradation due to uncontrolled development, pollution of agricultural liquid waste and simplification. The present research is for recognition of the vegetation cover of these ecosystems and also studying the factors causing their degradation in the southern border of the Caspian Sea (Mazindaran Province). The results of this research show there are 423 ponds with total areas of about 14000 hectares. Their distribution is drawn on a map with the 1.300000 scale. Due to change in plant structure of these ecosystems and dominance of increasing species such as Nympha alba, Phragmites australis, Typha latifolia and Lemna minor and invasion of foreign oppurtunist plants such as Azola and also pollution because of incoming agricultural liquid waste, it seems that the ponds are losing their ecological power and are heading towads waterlogging (destrophication). Now that the world is encountered with water crisis it is recommended a scientific overall study of the ponds for their protection and sustainable use, before complete destruction of these cultural-natural heritage of genebanks, diversity and special beauty, takes place.

The soil salinity is important parameter affecting the design of subsurface drainage and the land reclamation projects. The main aim of this research is the study of spatial variability and estimation of soil salinity data. The data set consisted of 638 sampling points with an average distance of 600 m, three depths of 0-50, 50-100 and 100- 150 cm, in Shib-Ab and Posht-Ab Payeen regions of Sistan plain. In this research the ordinary kriging, logkriging and cokriging have been used and precision of each method was evaluated by the cross - validation technique. The results showed that precision of all experimental semivariograms were low with a CO/sill of 89%, 83% and 75% for ordinary kriging, logkriging and cokriging, respectively. The logkriging method had the highest precision (MAE equal to 12. 375 dS/m) for estimation of soil salinity. In each depth, the MAE of all methods has been compared with is average amounts. The results showed that the relative error of all methods reduced from surface layer to subsurface layers. Consequently, the results indicated low spatial correlation for soil salinity in Sistan plain.

Introduction: To determine the prevalence of Anti-HCV, Anti-HIV and HBS Ag positive in addict prisoners and some related factors for infection. Methods: Descriptive cross sectional study with physical examination and a questionire was performed. Four hundred and seventy nine addict prisoners were interviewed and their blood samples were obtained. Results: Of 479 addict prisoners, 280 (58.45%) were non-N drug abusers and the remaining (41%-54) were IV-drug abusers. Frequency of HCV Ab, HBS Ag and HIV Ab was 131(7.35%), 7 (1.46%) and 5 (1.04%), respectively. The relation between IVDU and Anti- HCV positive was statistically significant. Discussion: Infection with hepatitis C secondary to use of injected drugs is endemic in Hamadan prisoners. Better access to harm reduction strategies is needed in this setting.