The objective of this study was to provide experimental data that could be used to predict frost growth and frost performance of a round plate fin-tube heat exchanger for low temperature heat pumps used in zero emission vehicles under cold weather conditions. In this study, round plate fin-tube heat exchangers were tested with variation of the fin space, air flow rate, relative humidity, and in...

Based on the orthogonal test, optimized ratio of hybrid fiber fly ash concrete prepared with different volume admixtures polypropylene and polyacrylonitrile fiber, lengths, was obtained, its frost resistance evaluated in terms mass change, dynamic elastic modulus, compressive strength, splitting tensile strength before after water salt freezing. Then, damage mechanism discussed by combining por...

Abstract The work investigates changes in the beam structure under action of local freezing, which leads to a change mechanical properties material and, consequently, structure. Two types samples were used: from cement-sand mortar and concrete. development deformations depending on conditions freezing samples. second accelerated method for assessing frost resistance was chosen according DSTU B ...

Large parts of the northern hemisphere are covered by snow and seasonal frost. Climate warming is affecting spatiotemporal variations of snow and frost, hence influencing snowmelt infiltration, aquifer recharge and river runoff patterns. Measurement difficulties have hampered progress in properly assessing how variations in snow and frost impact snowmelt infiltration. This has led to contradict...

Water suspended on chilled superhydrophobic surfaces exhibits delayed freezing; however, the interdrop growth of frost through subcooled condensate forming on the surface seems unavoidable in humid environments. It is therefore of great practical importance to determine whether facile defrosting is possible on superhydrophobic surfaces. Here, we report that nanostructured superhydrophobic surfa...

1. Rao D, Rao JR, Crothers, E et al. Increased erythromycin resistance in clinical Campylobacter in Northern Ireland—an update. J Antimicrob Chemother 2005; 55: 395–6. 2. Bowler ICJW, Connor M, Lessing, MP et al. Quinolone resistance and Campylobacter species. J Antimicrob Chemother 1996; 38: 315. 3. Health Protection Agency. http://www.hpa.org.uk/infections/ topics_az/campy/data_ew.htm (15 Feb...

in order to provide climatology atlas of frosts statistical properties of iran and to attain spatial and temporal pattern of it, daily data of minimum temperature of 62 synoptic weather stations for a 15 year-period (1991-2007) from october to may, were adopted from iran meteorological organization. by choosing may 1st as basis day, five statistical properties and their spatial and temporal dis...