In a recent paper by Vencheh and Esmaeilzadeh, a super-efficiency model based on RDM model is formulated where some input and output data are negative. However, we show that the formulation in the paper is not always feasible or bounded for its purpose and cannot produce the numerical results claimed. Moreover, we demonstrate that the super-efficiency model based on RDM model is unable to provi...

This paper describes a one-dimensional numerical model for natural gas production from the dissociation of methane hydrate in hydrate-capped gas reservoir under depressurization and thermal stimulation. Some of the hydrate reservoirs discovered are overlying a free-gas layer, known as hydrate-capped gas reservoirs. These reservoirs are thought to be easiest and probably the first type of hydrat...

ment? J Am Soc Echocardiograph 2009;8:895–8. 12. Ionescu AA, Moreno de la Santa P, Dunstan FD, Butchart EG, Fraser AG. Mobile echoes on prosthetic valves are not reproducible. Eur Heart J 1999;20: 140–7. 13. Kiavar M, Sadeghpour A, Bakhshandeh H, Bassiri HA, Tayyebi P, Esmaeilzadeh M et al. Are prosthetic valve fibrin strands negligible? The associations and significance. J Am Soc Echocardiogr ...

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background and objective : a considerable amount of sulfur hexafluoride is applied to evaluate the performance of each laboratory hood according to ashrae–110-95 method. sf 6 is extremely hostile to environment and expensive. in present work, the possibility of conducting this method of hood performance test with less volume of sf 6 was investigated. material and methods : the performance of a ...