No abstract

Most commercially available wall functions for k-ε turbulence models base on the two-zonal near-wall flow division assumption. Viscous and log-law sublayers are distinguished. In this article the three-zonal wall function concept with a buffer sublayer is developed. The aim of this new wall function is to improve the mean streamwise U + velocity profile. The proposed wall function is validated on backward-facing step experimental data. Physical implications of the model performance are also discussed.

No abstract

No abstract

Chemotherapy-induced nausea and vomiting are defined as the most common of side effects of treatment and, at the same time, are very difficult to accept for patients’, frequently causing changes in the therapy regimen, significantly reducing its effectiveness. Thus, an antiemetic prophylactic is essential to the provision of such a therapy for the patient. Pharmacotherapy often includes various drugs, including antiemetics, with the administration of such drugs by injection through two separate catheters being the preferred method. However, the co-administration of drugs and parenteral nutrition admixtures (PNAs) requires the consideration of compatibility, stability and potential negative interactions. To meet the purposes of clinical pharmacy, a compatibility test of ondansetron, dexamethasone and hydrocortisone with paediatric PNAs was conducted. PNAs differ in the composition of amino acid source (Primene® or Aminoplasmal Paed® 10%) and the type of injectable lipid emulsion (Lipidem® 200 mg/mL, Clinoleic® 20%, SMOFlipid® 200 mg/mL, Intralipid® 20%). An in vitro evaluation was performed in a static way as a simulated co-administration through a Y-site. The drug PNA ratios were determined based on the extreme infusion rates contained in the characteristics of medicinal products. All calculations were performed for a hypothetical patient aged 7 years weighing 24 kg. As a result of this study, it can be concluded that all tested PNAs showed the required stability in the range of parameters such as pH, osmolality, turbidity, zeta potential, MDD and homogeneity. The co-administration of antiemetic drugs does not adversely affect lipid emulsion stability. This combination was consistently compatible during the evaluation period.