In this study, a cross-flow plate-fin heat exchanger with offset fins is optimized by considering the effects of flow maldistribution for air side. For purpose, study focused on an increase in rate transfer, which can be achieved using non-equally fin structure. Numerical simulations have been carried out to investigate thermodynamic characteristics full-size porous media approach. Based numeri...

Article history: Received 17 February 2011 Accepted 26 July 2011 Available online 29 August 2011

BACKGROUND AND AIMS Our aim was to study intragastric volume and distribution of a liquid meal in patients with reflux oesophagitis using three dimensional ultrasonography. METHODS Twenty patients and 20 healthy controls underwent ultrasonographic measurements of the stomach using a position sensor based on magnetic scanhead tracking for acquisition of three dimensional images. In vivo accura...

Recent tests of a 250 m/m structured packing in a 1.22 m diameter column have produced some unanticipated results. Using two quite different systems, mass transfer performance in a relatively short 1.69 m bed was significantly better than previous results in a longer 3.78 m bed. No bed length effect was found on pressure drop. Two different severe vapor maldistributions were studied using a vac...

INTRODUCTION Current health policy directions in Zambia are formulated in the National Health Strategic Plan. The Plan focuses on national health priorities, which include the human resources (HR) crisis. In this paper we describe the way the HRH establishment is distributed in the different provinces of Zambia, with a view to assess the dimension of shortages and of imbalances in the distribut...

Novel, low density structures which combine biologically-based fibers with clay aerogels are produced in an environmentally benign manner using water as solvent, and no additional processing chemicals. Three different reinforcing fibers, silk, soy silk, and hemp, are evaluated in combination with poly(vinyl alcohol) matrix polymer combined with montmorillonite clay. The mechanical properties of...

The governments of Central Asia and the south Caucasus face a kaleidoscope of challenges as they each navigate the transition to modern, independent, and stable states. Most of these problems emanate from internal dynamics within each state that limit their ability to ensure stable and legitimate governments for the population. These are weak states characterized by repressive personalistic rul...

A new numerical model has been developed for the simulation of pate-fin-tube type of cooling and dehumidifying coils widely used in the air conditioning industry. The model discretizes the coil into nodes along the coolant path and carries out repetitive marches from the coolant inlet to its outlet while simultaneously updating the values of the air stream properties for obtaining quick converg...

Disturbances in iron homeostasis are frequently observed in individuals with malaria. To study the effect of malaria and its treatment on iron homeostasis and to provide a mechanistic explanation for observed alterations in iron distribution, we studied the course of the iron regulatory hormone hepcidin in anemic Tanzanian children with febrile Plasmodium falciparum malaria. Before initiation o...

Using data available for 1972 and 1982, the geographic spread o f dentists in the RSA, and dentist to pohdation ratios were studied. In general the numbers o f dentists per magisterial district have increased but only 5 per cent o f dentists are in rural districts (population <10 000). Dentist to population ratios decreased irregularly over the 10 year period, more in urban than in rural distri...