نتایج جستجو برای: breakthrough time
تعداد نتایج: 1899969 فیلتر نتایج به سال:
BACKGROUND Fentanyl buccal soluble film (FBSF) has been developed as a treatment of breakthrough pain in opioid-tolerant patients with cancer. The objective of this study was to evaluate the efficacy of FBSF at doses of 200-1200 microg in the management of breakthrough pain in patients with cancer receiving ongoing opioid therapy. PATIENTS AND METHODS This was a multicenter, randomized, doubl...
Rapid movement of agricultural chemicals through soil to groundwater via preferential flow pathways is one cause of water contamination. Previous studies have shown that time domain reflectometry (TDR) could be used to characterize solute transport in soil. However, previous studies have only scarcely addressed preferential flow. This study presents an extended application of TDR for determinin...
the vapor extraction (vapex) process, a solvent-based enhanced oil recovery process has been found promising for some heavy oil reservoirs. in this work, the vapex process is studied using a compositional simulator on a number of single-block and multiple block fractured systems. pvt data of one of an iranian heavy oil reservoir are used to tune the equation of state. effects of fracture spacin...
In this research paper, an experimental breakthrough curve for citric acid in an adsorption recovery process was determined by an ion-exchange resin in 20, 35, 55 °C. Also, a mathematical model for breakthrough curve was presented. Among ion exchange resins that have been experienced, many weak and strong basic anionic resins are available such as, IRA-92, IRA-93, IRA-420 and IRA-458 and all of...
In this study, the dynamic interactions between cyclodextrin (CD), an organic chemical and granular activated carbon (GAC) were investigated using column studies. Breakthrough curves of a chlorinated solvent, trichloroethylene (TCE) were obtained over a range of concentrations of 2-hydroxypropyl-beta-cyclodextrin (HPCD) (0, 20, and 50 g L(-1)) and flow velocities (1.0, 4.0, and 10.2 mL min(-1))...
BACKGROUND When using the combined spinal-epidural (CSE) technique for labour analgesia, parturients often experience breakthrough pain after the spinal medication has receded. We tested the hypothesis that a small dose of intrathecal morphine would reduce breakthrough pain. METHODS This was a randomized, double-blind, placebo-controlled trial. Subjects were randomized to receive either 100 m...
Soil and aquifer materials have a finite capacity for colloid retention. Blocking of the limited number of available retention sites further decreases the rate of retention with time and enhances risks (e.g., pathogens or colloid-associated contaminants) or benefits (e.g., remediation by microorganisms or nanoparticles) of colloid migration. Our objective was to use a straightforward procedure,...
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