background: taxonomy and identification of the ticks in the genus hyalomma, the most significant vectors of animal and human pathogen agents, have always been debatable. scientists believe that variation within the taxa of the genus hyalomma is the most important factor which causes misidentification. objectives: the purpose of this study is to identify valuable characters for male h. anatolicu...

the normal and lateral line cycloid scales of the native species garra rossica (nikol’skii, 1900), one of the most common and poorly known cyprinid fish in south-eastern iran have been subjected to the scanning electron microscopy technique in order to study their detailed structure. normal scale below the dorsal fin showed a clearcut demonstration between the anterior and posterior region with...

background: hyalomma anatolicum is the well-known hard tick, which is one of the most important livestock and hu­man pathogens vector, wide range in host and distributed in all over the hyalomma geographic fauna as well as in iran. taxonomy of the hyalomma ssp. is debatable whereas their identification is a problematic work. the reasons for this claim is time consuming delpy’s researches in ira...

Nitriding is a surface treatment technique used to introduce nitrogen into metallic materials to improve their surface hardness, mechanical properties, wear resistance and corrosion resistance. In this research, the effects of plasma nitriding parameters including frequency and duty cycle were investigated on samples with different grooves dimensions. Steel blocks prepared from DIN1.2344 hot wo...

To improve the wear resistance and mineral crushing performance of grinding rollers in cement, mining, other engineering fields, a striped groove morphology was designed on normal roller surface this study. The with different parameters quartz sand were tested purposely device. depth number grooves used as structural grooves, test protocol experimental design method. results showed that better ...

Diffuse interreflections cause effects that make current theories of shape from shading unsatisfactory. We show that distant radiating surfaces produce radiosity effects at low spatial frequencies. This means that, if a shading pattern has a small region of support, unseen surfaces in the environment can only produce effects that vary slowly over the support region. It is therefore relatively e...