SPNPStochastic Petri Net Package
SPNPService Provider Number Portability
SPNPSecure Plug and Play
SPNPSupport of Private Numbering Plan (telecommunications)
SPNPSociety of Private Nursing Practitioners (South Africa)
SPNPSubstrate Positive-Negative-Positive (transistor)
References in periodicals archive ?
Trivedi, "SPNP: stochastic petri net package," in Proceedings of the 3rd International Workshop on Petri Nets and Performance Models (PNPM '89), pp.
([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]])/Si[O.sub.2] nanoparticles (SPNPs) (0.05g) were added to pyridine (15 mL) and isobutylbenzene (2.73 g, 20.41 mmol) at 0[degrees]C.
This experiment was carried out for the first time by inexpensive, recyclable Silica-Supported Preyssler Nanoparticles ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]/Si[O.sub.2]) (SPNPs) nanocatalyst.
Lactic acid (90%) was dehydrated by vacuum distillation and immediately refluxed with ethanol in presence of SilicaSupported Preyssler Nanoparticles ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]/ Si[O.sub.2]) (SPNPs) and with azeotropic removal of water to afford ethyl lactate (2) in 82 % yield, (Scheme 1).
The yields of the synthesis of Ibuprofen ethyl ester with Silica-Supported Preyssler Nanoparticles ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]/Si[O.sub.2]) (SPNPs) and other acid catalysts are given (Scheme 1, Table 1).
Initially, we compared the catalytic performance of Silica-Supported Preyssler Nanoparticles ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]/Si[O.sub.2]) (SPNPs) catalyst, Keggin, [H.sub.3] [[PW.sub.12][O.sub.40]], [H.sub.4][Si[W.sub.12][O.sub.40], [H.sub.3][P[Mo.sub.12][O.sub.40]], [H.sub.4][Si[Mo.sub.12][O.sub.40]], [H.sub.14][Na[P.sub.5][W.sub.29][Mo.sub.O11]], [H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]/ Si[O.sub.2](50%), [H.sub.3][P[W.sub.12][O.sub.40]]/Si[O.sub.2](50%), [H.sub.2]S[O.sub.4], and without catalyst in the synthesis of Ibuprofen.
SilicaSupported Preyssler Nanoparticles ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]/ Si[O.sub.2]) (SPNPs) nanocatalyst > [H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]] > [H.sub.14][Na[P.sub.5][W.sub.29]Mo[O.sub.110]] > [H.sub.6][[P.sub.2][W.sub.18][O.sub.62]] > [H.sub.3][P[W.sub.12][O.sub.40]] > Zeolite > [H.sub.3][P[W.sub.12][O.sub.40]]/Si[O.sub.2](50%) > [H.sub.4][Si[W.sub.12][O.sub.40]] > p-TSA > [H.sub.3][P[Mo.sub.12][O.sub.40]] > [H.sub.2]S[O.sub.4] > [H.sub.4][Si[Mo.sub.12][O.sub.40]] catalyst > free catalyst.
It is clear from these reactions that the efficiency of [H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]/Si[O.sub.2](SPNPs) nanocatalyst is higher than these of Keggin heteropolyacids.
The heteropolyacid ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]) on Si[O.sub.2] nanoparticles (SPNPs) was characterised by infrared (IR) spectroscopy (Figure 4) [9].
Infrared spectroscopy shows that in ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]])/Si[O.sub.2] nanoparticles (SPNPs) the heteropolyacid structure ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]) is preserved (Figure 4).
In Table 2, the comparison of efficiency of Silica-Supported Preyssler Nanoparticles ([H.sub.14][Na[P.sub.5][W.sub.30][O.sub.110]]/Si[O.sub.2]) (SPNPs) catalyst in the synthesis of Ibuprofen after five times is reported.