A RADIOCARBON CHRONOLOGY FOR THE ACERAMIC SHELL-MIDDENS OF COASTAL OMAN

Our knowledge of the prehistory of coastal Oman has greatly increased during the last ten years. This article considers the radiocarbon chronology of the aceramic shell-middens scattered along the coast between Muscat, to the north, and Shuwayr, to the south. The appearance of these middens seems to correspond to the climatic deterioration that, according to more recent results, took pIace around the middle of the seventh millennium BP.The number of sites seems to have increased since the beginning of the actual arid phase, around 6000 B

Heat recovery heat pump operating with a desiccant loop in A.C. systems

This paper deals with the application of heat recovery heat pump operating with a liquid desiccant loop provided with membrane vapour exchangers in air-conditioning systems. The application investigated achieves enthalpy recovery between the renewal air and the exhaust air. The system operates by means of two membranes contactors: the first one acts on the renewal air flow and the second on the discharged air flow. A heat pump chills the solution entering into the first contactor and heats the solution at the inlet of the second one. In the present study, summer climatic conditions are considered. During this season, the renewal air, which is warm and humid, is dehumidified and cooled, while the exhaust air, which is cold and dry, is used to regenerate the solution. The analysis has been carried out by means of a SIMULINK program able to investigate the performances of the system. Results of simulations show considerable energy saving

The polished stone earrings of site RH5 and the distribution and chronology of the prehistoric earrings of coastal Oman

The authors describe the soapstone earrings from the shell midden site and cemeptery of RH5 at Muscat, Sultanate of Oman, and compare them with other similar finds from other sites of the coast of Oma