objective neuropsychological impairment is an important co-morbidity of chronic epilepsy. the aim of this study was to determine the state of the cognitive and motor development of patients with refractory epilepsy. materials & methods  we studied 150 consecutive children with epilepsy who were referred to mofid children hospital, a third level public referral university hospital in tehran, ira...

objective several investigations have demonstrated that rosa damascena has an inhibitory effect on the hypothalamus and on pituitary system reactivity in the rat; it has also been shown that the essential oil of rosa damascena has significant antiepileptic effects on pentylentetrazole (ptz) induced seizures in rats. we aimed at assessing the effects of the essential oil of rosa damascena when u...

Motivation AlGaN/GaN HEMT rf transistors are rapidly developing due to their high output power density, high operation voltage and high input impedance. Ni-based gate metallization is widely used to form the Schottky gate contacts. However, temperature and electric field levels are higher in AlGaN/GaN compared to traditional III-Vs and therefore the diffusion of Ni into AlGaN/GaN constitutes a ...

To separate one base metal mineral from another by flotation, it is indispensable to identify chemical reagents that specifically interact with the surface metal sites of one mineral or a group of minerals. This work studies the interactions of chelating collectors which offer the best potential for collecting abilities and mineral specificity with a typical refractory oxide mineral (malachite)...

Introduction: CH-carbonaceous chondrites have excess FeNi-metal and are strongly depleted in moderately volatile and volatile elements (Mn, Na, Zn, Se), but have CI refractory element/Mg ratios [1]. In contrast to other carbonaceous chondrites, CHs have high modal abundances of chondrules (~70 vol.%) with a mean diameter of 70-90 μm, FeNi-metals (~20 vol.%) and very low fractions of matrix (~5 ...

We have performed density functional calculations to investigate the adhesion and electronic structure at interfaces between Al and the refractory transition metal nitrides/carbides VN and VC in order to understand the significance of the ceramic’s metalloid component upon interfacial properties. We find that for both systems the preferred bonding site places the metal interfacial atoms above t...

Highly successful advanced manufacturing techniques of refractory metals are becoming increasingly necessary to navigate technology gaps. Refractory metal alloys desirable meet the need for high temperature structural materials, but difficult produce because their strength, low ductility, and melting point. This work demonstrates use laser powder bed fusion several Mo-Re by additively mechanica...

The joining of wires to various substrates (wires, plates, foils and semiconductor packages) is a ubiquitous process in the manufacture and modification of electrical and electronic devices. While spot welding is used extensively to attach lamp and vacuum tube filaments to base wires and foils, soldering is almost universally used to make chip to package and wire to substrate interconnections i...

This work examines the excessive absorption and anomalous cooling phenomena reported in laser-induced incandescence measurements on metal nanoparticles by considering effects of aggregate structure sintering. Experimental investigations are conducted iron molybdenum aerosols, which have different melting points, thus respond differently to laser pulse. Although aggregation enhances cross-sectio...