Superhard substances are those a hardness above 20 GPa, i.e. higher than that of corundum (Kislii et al.,1988) or with a Vickers hardness Hv exceeding 40 GPa (Sologenko&Gregorianz, 2005). The ten utmost non-metal substances and refractory compounds form a "hardness pyramid" (Kislii et al.,1988) diamond being on top, followed by cubic-boron nitride and boron carbide. Metal-like ones form a simil...

This study describes the role of in situ nano SiC whiskers on the strength and density of alumina silicate–SiC-carbonrefractory compounds. The prepared specimens were composed of 65 wt. % chamotte as alumina silicatecompound, 15 wt. % SiC-containing material regenerates and 10 wt. % fine coke and 10 wt. % liquid resole asbinder. Different values of additives (such as silicon a...

how to cite this article: mollamohammadi m, tonekaboni sh, pirzadeh z, vahedian m . pregabalin in childhood epilepsy: a clinical trialiran j child neurol. 2014 autumn;8(4): 62-65. abstract objective the prevalence of active epilepsy is about 0.5–1%, and approximately 70% of patients are cured with first anti-epileptic drugs and the remaining patients need multiple drugs. pregabalin as an add-on...

Endoscopic ultrasound (EUS)-guided drainage is now the treatment of choice in cases of pancreatic pseudocysts and walled-off necrosis, especially in the absence of luminal bulging and in patients with portal hypertension. Malignant refractory ascites usually heralds a poor prognosis and substantially impairs the quality of life of patients because of the symptoms experienced and the need for re...

BACKGROUND AND STUDY AIMS Despite a pronounced reduction of lethality rates due to upper gastrointestinal bleeding, esophageal variceal bleeding remains a challenge for the endoscopist and still accounts for a mortality rate of up to 40% within the first 6 weeks. A relevant proportion of patients with esophageal variceal bleeding remains refractory to standard therapy, thus making a call for ad...

This review describes the historical development and current state of metals leaching and sulfide mineral biooxidation by the minerals industries. During the past 20 years commercial processes employing microorganisms for mineral recovery have progressed from rather uncontrolled copper dump leaching to mineral oxidation and leaching in designed bioheaps for oxidation of refractory gold ores and...

A laboratory-scale anaerobic/anoxic/oxic system operated at the hydraulic retention times (HRT) of 20, 40, and 60 h with mixed liquor suspended solids (MLSS) concentrations of 3 g/L and 6 g/L was considered for treating chemical industrial wastewater rich in complex organic compounds and total dissolved solids. Extending the HRT and increasing the MLSS concentration resulted in higher removal e...

Introduction: Opaque assemblages (OAs) are very complex objects in CV3 chondrites. They consist of Ni-rich metal, Fe-oxides, sulfides, phosphates, silicates, refractory Pt-group element metals (PGMs) and their oxides. OAs occur in CAIs, chondrules, and matrix of CV3 chondrites [1,2]. Some of the phases are refractory and others are volatile. They can consist of highly reduced or highly oxidized...

A near-perfect absorber for the visible regime based on metal-dielectric-metal subwavelength grating structure with refractory metals is designed and demonstrated numerically. The presents an average absorption over 98.4% in at normal incidence. Angle-relative analysis shows that proposed has good angle-tolerance. high (86.6%) region can be maintained incident angles up to 60°. Through of magne...