We discuss the role of light absorption by pairs of atoms (radiative collisions) in the context of a model for an atom laser. The model is applied to the case of VSCPT cooling of metastable triplet helium. We show that, because of radiative collisions, for positive detuning of the driving light fields from an atomic resonance the operating conditions for the atom laser can only be marginally me...

Several previous studies have investigated active night cooling strategies to reduce the peak load in buildings, primarily by precooling building ventilation air during night. In this study, is supplied use of district cooling, mainly for buildings hydronic systems, such as chilled beam or fan coil but potentially also cool if outdoor temperature above supply setpoint. A field test with was con...

In this article we report on the use of degenerate-Raman-sideband cooling for the collimation of a continuous beam of cold cesium atoms in a fountain geometry. Thanks to this powerful cooling technique we have reduced the atomic beam transverse temperature from 60 mK to 1.6 mK in a few milliseconds. The longitudinal temperature of 80 mK is not modified. The flux density, measured after a parabo...

Loosening of total joint replacements may be caused in part by thermal necrosis of bone in contact with the high temperature of the polymerizing PMMA acrylic cement. This study reports a method to reduce the temperature of the bone-cement interface below the temperature at which bone results in definite necrosis. By precooling the acetubular component to --84 degrees before insertion into the c...

Abstract The article deals with the adjustment of flow rate milk and water by a plate heat exchanger, which is used for precooling milk. First, measurements parameters device in stable were carried out. Subsequently, exchanger was measured laboratory. Water at 35 °C instead Different ratios cooling cooled (instead milk) set. From values, changes temperature calculated depending on its constant ...

The selection of proper refrigerants for natural gas liquefaction processes play a key role in cycle?s efficiency. Mixed have been proven to improve exergy efficiency over single pure refrigerant. However, the future some these with higher global warming potential index are unknown due continuous restriction being enforced by energy and environmental agencies past few decades. This study examin...