Water as a refrigerant (R718) is compared with other modern refrigerants (R717, R290 R134a, R12, R22, and R152a) regarding refrigeration capacity and COP (coefficient of performance). A computer program simulating a theoretical vapor compression refrigeration cycle was developed to calculate COPs, compression ratios, and discharge temperatures of the refrigerants from the compressor. The effect...

Bacterial recovery by a portable Reuter centrifugal air sampler and a standard Mattson-Garvin slit-to-agar air sampler was compared in a series of experiments. Microbial air quality was monitored in seven typical laboratory locations. Tests showed that the Reuter centrifugal air sampler yielded significantly higher recoveries than did the slit-to-agar unit.

Shot Peening process relies on multiple impacts of spherical media to a surface to achieve residual compressive stresses. This results in improved material characteristic.0utofthetwomethodd propeilingshotsforpeeningviz. Airless Shot Peening and Pneumatic Shot Peeningthis papercteals with essentials of centrifugal Blasting Machine and converting a centrifugal Airless Blast Machine to a Shot Peen...

The Kaluza-Klein reduction of 4d conformally flat spacetimes is reconsidered. The corresponding 3d equations are shown to be equivalent to 2d gravitational kink equations augmented by a centrifugal term. For space-like gauge fields and nontrivial values of the centrifugal term the gravitational kink solutions describe a spacetime that is divided in two disconnected regions.