The transport properties of the ceramic based refractory coating to allow proper permeation of degradation products during the pyrolysis of expanded polystyrene (EPS) foam in Lost Foam Casting (LFC) have an important influence on the success of the casting process. This paper proposes a new apparatus to evaluate the permeability of the refractory coatings in a relatively large differential pres...

Refractory materials such as carbon possess properties that make joining them difficult. In this work, bonding of a carbon–carbon composite is achieved by employing self-sustained, oxygen-free, high-temperature combustion reactions. The effects of several parameters, such as the composition of the reaction media, and the values of the applied current and pressure, on the mechanical strength of ...

Work during 1963 is reported and the work from mid-1960 reviewed on a comprehensive program of thermodynamic and kinetic studies necessary to the theoretical consideration to temperatures of 3000K of the reactions of the zirconium and hafnium carbides and borides with oxygenor halogen-containing atmospheres. ; • Work presented includes: preparation of borides and carbides; low ', temperature he...

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...

The access of Virtual Organizations to raw materials normally requires external resources. In many cases, the market for raw materials is regulated and the VO principles of trust, customer orientation etc. are not applicable. In consequence, the VO needs to provide reliable solutions for the customer while being dependent on the access to the required raw materials. The objective of the propose...