Abstract Two extraction procedures, namely dispersive liquid-liquid microextraction (DLLME) and based on solidification of floating organic drop (DLLME-SFOD), have been compared for the spectrophotometric determination Fe (III). In both (III) was extracted after complexation with gallic acid in presence cetyltrimethylammonium bromide (CTAB). Tetrachloroethylene 1-undecanol were used as solvents...

Gao and Sonin (1994) have proposed a method for rapid prototyping and microfabrication by precise deposition and solidification of molten microdrops. Objects can be fabricated by a drop-on-demand, computer-controlled droplet generator. To understand the fundamentals of droplet deposition and solidification, experiments have been conducted using microcrystalline wax droplets (Schiaffino and Soni...

Storing of available energy for later use is a necessity in the present world, one such method is using Phase Change Materials (PCMs). PCMs need a heat transfer medium to transfer the energy from the source to the PCM. In this present work spherical balls are used to store the PCM and water is used as a heat transfer fluid. Paraffin wax (PW) and Palmitic acid (PA) and (4060% PW-PA) eutectic mix...

The quadruple (1 484 801, 1 203 120, 1 169 407, 1 157 520) already known is essentially the only non-trivial solution of the Diophantine equation x4 + 2y4 = z4 + 4w4 for |x|, |y|, |z|, and |w| up to one hundred million. We describe the algorithm we used in order to establish this result, thereby explaining a number of improvements to our original approach [EJ].

Background: A syringe to syringe dispersive liquid phase micro-extraction-floating organic drop was applied and used for the simultaneous extraction and pre-concentration of trace amounts of amphetamine (AMP) and methamphetamine (MAMP) in urine samples. The extracted analytes were determined by high performance liquid chromatography along with diode array detection. Materials & Methods: In thi...