Selective and efficient tripodal receptors for competitive solvent extraction and bulk liquid membrane transport of Hg2+.
ABSTRACT A series of tripodal receptors that are different from each other in their end groups were synthesized. The extraction ability and the transport rate of these receptors were evaluated for transition metal ions (Fe(3+), Ni(2+), Cu(2+), Zn(2+) and Hg(2+)). The receptor bearing pyridyl nitrogens extracted Hg(2+) from a buffered aqueous medium containing a mixture of metal ions and transported it into an organic phase with a complete selectivity over the other metal ions. This receptor was effectively used for transporting Hg(2+) from aqueous buffered source phase to aqueous receiving phase through a chloroform membrane.
- SourceAvailable from: Sofiène Affes
Conference Proceeding: Partial interference subspace rejection in CDMA systems[show abstract] [hide abstract]
ABSTRACT: Previously presented interference subspace rejection (ISR) proposed a family of new efficient multiuser detectors for CDMA. We reconsider in this paper the modes of ISR using decision feedback (DF). DF modes share similarities with parallel interference cancellation (PIC) but attempt to cancel interference by nulling rather than subtraction. However like the PIC they are prone to wrong tentative decisions. We propose a modification to DF modes that performs partial ISR instead of complete interference cancellation. When tentative decisions are correct, interference is therefore not perfectly rejected anymore. This drawback is compensated by improved robustness to wrong tentative decisions. We show that in hard handoff systems, partial ISR can only provide negligible performance improvements in high loaded systems outside the region of interest due to out-sector interference. In situations where both in-sector and out-sector interferences are cancelled, as may occur in soft handoff situations, BER performance may improve by more than I dBVehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd; 02/2001
- European Journal of Pain Supplements 01/2011; 5(1):135-136.