Copper oxide and zirconia-supported copper oxide catalysts were tested for their catalytic activity for carbon monoxide and propylene oxidation reactions. The synthesized catalyst was supported by wet impregnation on zirconia. The higher activity of zirconiasupported catalyst compared to unsupported catalyst may be attributed to homogeneous and higher dispersion on zirconia, ionic oxygen carrying capacity of zirconia.

The problem of arsenic contamination in drinking water sources is a global concern and extensively documented elsewhere Chowdhury et al. 2000; Hering and Chiu 2000; Berg et al. 2001. Coagulation with ferric chloride is an effective and economical technique for the removal of arsenic from contaminated water to produce safe drinking water Hering et al. 1997. However, the sludge generated by this process has substantial concentration of arsenic and requires further careful treatment before disposing into the environment.

A sandwich beam buckling problem is studied here using two-dimensional elasticity to model the beam constituents. Theglobal and local instability of such a beam with orthotropic constituents under various boundary conditions are investigated. The facesheet and the core are assumed to be linear elastic orthotropic continua. General buckling deformation modes of the sandwich beam
subjected to uniaxial compressive loading are considered.

Acoustical duct silencers, how do they work, and how an you measure performance? How do you know if the performance is to the latest standard? How does AMCA compare to NVLAP? These can be very confusing questions, and their answers even more confusing. This article will attempt to clarify these questions and more.

According  to  the  technical  literature  from  leading  fan manufacturers,  the  primary  cause  of system-related fan noise is air turbulence at the inlet side of the fan. Turbulence is caused by obstructions in the air stream such as ?nger guards (PSUs with 120mm  fans), or capacitors, heat sinks, etc  (PSUs with 80mm  fans).