Design and manufacturing of a V-type Stirling engine with double heaters

Under the consideration of the solar energy potential of Turkey, a V-type Stirling engine having two heaters was designed, optimized and then manufactured. The prototype engine was tested in laboratory condition using an electrical heating system. Tests were conducted within the temperature range of 650-1000 °C with 50 °C increments. The pressure ranged from the ambient value to 2 bar with 0.5 bar increments at each stage of temperature. The maximum power was obtained at 950 °C and 1.0 bar charge pressure as 118 W.Stirling engines Double displacer Helium Charge pressure

Spontaneous regression of huge cardiac rhabdomyoma in an infant

Rhabdomyomas are the most common primary cardiac tumors in childhood, and are often associated with tuberous sclerosis. This article reports on a huge rhabdomyoma in an asymptomatic four hour old infant who presented initially with a murmur due to moderate subaortic stenosis. Followup showed regression of the tumour. Although the indications for surgical resection of symptomatic tumors are well established, medical follow-up should be the prefered treatment.peer-reviewe