this research includes both experimental and cfd investigation in the hydrodynamic behavior of a new type of column tray introduced as “concap” tray. the proposed column tray is used in contactor columns especially in stripping columns. the hydrodynamics of this concap tray is investigated in a 1.2m in diameter column. using air-water system, the experiments were performed for different liquid ...

This research includes both experimental and CFD investigation in the hydrodynamic behavior of a new type of column tray introduced as “Concap” tray. The proposed column tray is used in contactor columns especially in stripping columns. The hydrodynamics of this Concap tray is investigated in a 1.2m in diameter column. Using air-water system, the experiments were performed for different liquid ...

STATEMENT OF PROBLEM Use of custom tray and tray adhesive is clinically recommended for elastomeric impression material. However there is not clear mention of drying time of tray adhesive in achieving appropriate bonding strength of tray material and impression material. PURPOSE This study is to investigate an appropriate drying time of tray adhesives by evaluating tensile bonding strength be...

The effect of TraY protein on TraI-catalyzed strand scission at the R1 transfer origin (oriT) in vivo was investigated. As expected, the cleavage reaction was not detected in Escherichia coli cells expressing tral and the integration host factor (IHF) in the absence of other transfer proteins. The TraM dependence of strand scission was found to be inversely correlated with the presence of TraY....

STATEMENT OF PROBLEM Various impression techniques have different effects on the accuracy of final cast dimensions. Meanwhile; there are some controversies about the best technique. PURPOSE This study was performed to compare two kinds of implant impression methods (open tray and closed tray) on 15 degree angled implants. MATERIALS AND METHOD In this experimental study, a steel model with 8...

Accurate impression is a main requirement for obtaining passive fit of restorations. The aim of this case report is an alternative technique in using closed-tray impression posts for open-tray impression technique for exemplification at a patient that can have limited interocclusal vertical space. After osseointegration, 7 implants examined in edentulous maxilla, open-tray impression technique ...

The traY gene of the Escherichia coli F plasmid has been shown by genetic studies (R. Everett and N. Willetts, J. Mol. Biol. 136:129-150, 1980) to be involved in the site-specific nicking reaction at oriT required for the initiation of DNA transfer during bacterial conjugation. In order to assign a biochemical function to TraY protein, the traY gene was cloned in a plasmid vector which utilizes...

Many test handlers process semiconductor devices in trays which must be rapidly heated or cooled by a forced air flow to a desired test temperature and then back to ambient temperature. This paper describes a new design feature for testhandler tray that significantly increases the rate of convective heat transfer to the tray and the devices in the tray. The improved tray incorporates lateral ri...