background and purpose: fascioliasis is one of the zoonotic diseases in the world that has public health and economic perspectives. the aim of this study was to investigate the prevalence of fascioliasis in slaughtered cattle in the industrial slaughterhouse of arak, iran (2007-2010). materials and methods: this study sample was consisted of 648994 head of cattle including 292797 sheep, 81012 c...

Background: Colorectal cancer (CRC) is among the most common and preventable cancers, incidence risk factors of which are different in various populations. Objectives: The present study aims at assessing rate, factors, symptoms CRC populations aged 50 to 70 years old covered by health centers Arak, as well evaluating participation rate screening program. Methods: cross-sectional was conducted f...

Dryer system is a controlled plant which is normally used in chemical industry. The proper modeling of this system facilitates its maintenance and keeping. Normally this is not an easy task, unless having a complete model of the process, due to sudden and nonlinear events. In this paper the linear identification of dryer plant in Arak petroleum, is introduced according to the Autoregressive wit...

Algebraic varieties that are locally isomorphic to open subsets of affine space will be called plain. Plain varieties are smooth and rational. The converse is true for curves and surfaces, and is unknown in general. It is shown that plain varieties are stable under blowup in smooth centers.

background: milk is regarded as a unique source of food for all ages. when milk is exposed to various contaminants, including lead and cadmium, it is considered a risk to humans. the presence of some metal pollutants, especially cd and pb, facilitates their entry into the food chain and thus increases the possibility of their toxic effects on humans and animals. therefore, we decided to check l...

In order to investigate concentrations, variability, sources, and human health risk of trace elements, 38 atmospheric dust samples were collected around Arak industrial area. The average concentrations Cd~Zn, As, Pb 3.3, 2.5, 2.4 times higher than the corresponding geochemical background, respectively, while Co, Cu, Ni, Hg lower. Based on geo-accumulation index (Igeo), elements classified betwe...