In the present work, a prototype of a new type of solar collectors, which called Direct Absorption Solar Collector, was built and its thermal performance is experimentally compared with conventional flat plate solar collector under transient and steady state conditions. Different volume fractions of multi wall carbon nanotubes in water and ethylene glycol mixture (70%:30% in volume) were used a...

AIM We aimed to explore the organization of the calendar knowledge base underlying date calculation by assessing the ability of savant calendar calculators to free recall a series of date lists. METHOD Four experiments are reported that assessed recall of structural and non-structural features of the calendar in eight savant calendar calculators (seven males; one female; median age 34 y 6 mo;...

â â  in this research, temporal and spatial behavior of subtropical high pressure was studied at the level of 600 hpa. this study has been done using daily data of geopotential height at 12 gmt in ncep/ncar database with spatial resolution of 2.5ã—2.5 degree in a 55 years period including 20089 days from january, 1st, 1951(dey, 11th, 1329) to december, 31st,2005(dey, 10th,1384). at first, the m...

In this research, the thermodynamic investigation of the tri-generation system is performed by the first and second law of Thermodynamics. The trigeneration system under study consists of three subsystems including the solar subsystem, Kalina subsystem and lithium bromide-water absorption chiller subsystem. The proposed system generates power, cooling and hot water using solar energy. The syste...

Since the 19th century, archaeologists have puzzled over Chankillo, a massive, 2300year-old ruin 400 kilometers north of Lima, with a walled hilltop center and an enigmatic line of 13 small, rectilinear towers. Scientists have variously interpreted the complex “as a fort, a redoubt, a temple, and even as the setting for ceremonial battles,” says archaeologist Iván Ghezzi of the Pontificia Unive...

OBJECTIVE To search for a time parallelism between lunar and solar rotation cycles and calendar dates of attacks of pseudogout--chondrocalcinosis articularis (pyrophosphate arthropathy). METHODS Seventy-four documented attacks with known calendar dates of onset recorded in 16 patients of one family cluster between 1955 and 1995 were examined in this study. Their daily frequencies during the g...

ramadan is a sacred month for muslims all around the world. during this lunar-based month, healthy adult muslims are obligated to abstain from eating, drinking, smoking, or using oral medications from predawn to sunset. followers will typically eat just after sunset and again before dawn (1). the islamic lunar hijri calendar is 11 days shorter than the gregorian solar calendar, and therefore, t...

Muslims’ aspiration to have an international or global Islamic calendar has long been discoursed through various meetings nationally and internationally. In this context, Malaysia played imperative role the “World Conference on International Calendar” 29 Rabiul Awal-2 Akhir 1412 H/8-10 October 1991 at Science University of (USM) Penang. This meeting instigated programs steps towards unification...