Meckel''s diverticulum: demonstration of heterotopic gastric mucosa with technetium-99m-pertechnetate SPECT

Demonstration of functioning heterotopic gastric mucosa with 99mTc-pertechnetate SPECT is reported. Abnormal tracer uptake was shown conclusively with SPECT but not with planar imaging. When a Meckel's diverticulum is suspected, we suggest SPECT be performed if the results of planar scintigraphy are equivocal and that it be considered if there is a high clinical suspicion and planar imaging is normal.     

Comparison of methods for estimating loss from water storage by evaporation and impacts on reservoir management

Reservoirs are the key infrastructure of water resources management. A controlling variable of reservoir operation is evaporation, which in semi‐arid and arid regions may consume a large fraction of reservoir storage annually. This paper assesses the role of evaporation and the choice of evaporation methods on reservoir operation. The operation of the reservoir is calculated with the standard operation policy (SOP). Several efficiency criteria are employed to rank the evaporation‐calculation methods with the technique for the order of preference by similarity to ideal solution (TOPSIS). The method presented in this paper is illustrated by applying its application to Karkheh reservoir, the largest in Iran.     

Two New Thermodynamic Constraints for a Solid/Supercritical Fluid System

One of the phenomenological observations in any supercritical system is the common pressure where all the solubility isotherms intersect. Thus, this crossover pressure addresses a thermodynamic constraint or a key set of conditions for supercritical mixtures. In this paper, a phase stability analysis has been performed for the formulation and estimation of the crossover pressure. This absolute theoretical approach includes two subsequent steps. At the first step, it has been formulated in terms of an abstract quantity, i.e., Gibbs free energy. However, the system should be treated more quantitatively in order to estimate the crossover pressure. Therefore, at the second step, which is based on the solute behavior at the infinite dilution limit, the equations formerly used have been further manipulated, which ultimately leads to two equations that are given in terms of estimable properties. They are actually two thermodynamic constraints for solid/SCF mixtures. One of them has been used to predict the crossover pressure of certain mixtures. The other one has not been used for this task due to a theoretical restriction. However, the successfully prediction of the crossover pressure by using either of the equations confirms the other one since they are subsequent and related equations.