This paper presents environment friendly refrigerant R290 as a solution to the environmental concerns like depletion of ozone layer and rise in global warming because of wide use of synthetic refrigerants R22 and R134a. The water cooler is the widely used refrigeration application in warm climatic countries. Refrigerant R22 and R134a are predominantly used refrigerants in water cooler refrigera...

The syntheses of the 4,4′-trimethylenebis(N-methylpiperidine):boric acid (1:1) co-crystal, 4,4′-(1-MeNC5H9)2(CH2)3.B(OH)3 (1), and a zwitterionic tetrahydroxidohexaoxidopentaboron adduct, [B5O6(OH)4(κN-NH2CH2CH2NHEt2).H2O (2), (NH2CH2CH2NEt2 = deen) from appropriate combinatorial libraries primed with B(OH)3, are reported together their spectroscopic (NMR, IR) single-crystal XRD characterizatio...

Four new cases of ring G chromosomes are presented including one family in which the ring 21 is present in a mother and in her daughter, who has 47, XXX, r(21) chromosomes. The clinical and dermatoglyphic findings in r21 and r22 syndromes are reviewed.

The scroll compressor, using R41 OA that has higher density and works at higher pressure than R22, is required to redesign its geometry such as wrap profile. The design parameters of wrap profile such as base circle radius, wrap height, involute end angle and discharge port have to be well determined to obtain high compressor efficiency. At first, a simulation program has been developed to pred...

We propose an elemantary approach to Zudilin’s q-question about Schmidt’s problem [Electron. J. Combin. 11 (2004), #R22], which has been solved in a previous paper [Acta Arith. 127 (2007), 17–31]. The new approach is based on a q-analogue of our recent result in [J. Number Theory 132 (2012), 1731–1740] derived from q-Pfaff-Saalschütz identity.