1-(3-Fluoro­phen­yl)-4,4,6-trimethyl-3,4-dihydro­pyrimidine-2(1H)-thione

In the title compound, C13H15FN2S, the dihydro­pyrimidine ring is essentially planar, with a maximum deviation of 0.086 (3) Å from the mean plane of the rest of the ring for the dimethyl­ated C atom. The benzene ring is almost perpendicular to the dihydro­pyrimidine ring, with a dihedral angle of 83.97 (14)°. The crystal packing is characterized by centrosymmetric dimers resulting from pairs of inter­molecular N—H⋯S hydrogen bonds. There are also C—H⋯π inter­actions

Kajian Waktu Tempuh Pergerakan Penumpang Dan Bagasi Di Terminal Kedatangan Bandar Udara Internasional Sultan Hasanuddin Makassar

The purpose of this study was to determine differences in travel time and the factors that influence the differences in travel time of passengers and baggage movement in arrival terminal at Sultan Hasanuddin International Airport, Makassar. This research is a correlation study, using primary data from direct measurements in the field as well as secondary data derived from monthly reports of the Divisi Operasional Aeronautical Information Service, which is a fixed flight schedule, and from the Divisi Sisi Udara, in the form of data movement on the apron. Processing data in this study used the SPSS software. The analysis showed the smallest time difference between passengers and baggage occurs when using the bus, followed by the use of aviobridge. The greatest difference in time occurs when walking. It can be concluded that the use of the bus is more effective in reducing delays in baggage reception at the arrival terminal

Pulsating flow in a planar diffuser upstream of automotive catalyst monoliths

The flow distribution across automotive exhaust catalysts has a significant effect on their conversion efficiency. The exhaust gas is pulsating and flow distribution is a function of engine operating condition, namely speed (frequency) and load (flow rate). This study reports on flow measurements made across catalyst monoliths placed downstream of a wide-angled planar diffuser presented with pulsating flow. Cycle-resolved particle image velocimetry (PIV) measurements were made in the diffuser and hot wire anemometry (HWA) downstream of the monoliths. The ratio of pulse period to residence time within the diffuser (defined as the J factor) characterises the flow distribution. During acceleration the flow remained attached to the diffuser walls for some distance before separating near the diffuser inlet later in the cycle. Two cases with J ∼ 3.5 resulted in very similar flow fields with the flow able to reattach downstream of the separation bubbles. With J = 6.8 separation occurred earlier with the flow field resembling, at the time of deceleration, the steady flow field. Increasing J from 3.5 to 6.8 resulted in greater flow maldistribution within the monoliths; steady flow producing the highest maldistribution in all cases for the same Re

Complexation of 5,5,7,12,12,14-Hexamethyl-1,4,8,11-Tetraazayclotetradeca-7,14-Dienium Bromide With Copper Acetate In Methanol And Aqueous Solutions

5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclodeca-7,14-dienium bromide disolvate                       ((Me6N4H4)Br2.2H2O) is a 14-membered deprotonated tetraaza macrocyclic salt. Its neutral analogues and their complexes were prepared by templation method under refluxed condition since it was discovered by Curtis in 1961. However, the present diprotonated  tetraaza salts react with many metallic salts in both methanolic and aqueous solutions. The complexation involved deprotonation of the diagonally opposite protonated amines and the type of metal salt and solvents also play an important role in the final complex formation. The complexation of (Me6N4H4)Br2.2H2O with copper acetate in methanol and aqueous solutions gave the expected complex of  [Cu((Me6N4H2)Br]Br.2H2O. Pseudo-first order condition for the complexation reaction in water was established

2-Amino­cyclo­hexan-1-aminium thio­cyanate

The title compound, C6H15N2 +·NCS−, was obtained unexpectedly from the reaction mixture of benzoyl chloride, ammonium thio­cyanate and cyclo­hexane-1,2-diamine. The cyclo­hexane ring adopts a chair conformation. In the crystal, N—H⋯S and N—H⋯N inter­actions involving the thio­cyanate anion and both the amine and the aminium N atoms link the mol­ecules, forming two-dimensional networks parallel to (001)

An assessment of CFD applied to steady flow in a planar diffuser upstream of an automotive catalyst

Flow maldistribution across automotive exhaust catalysts significantly affects their conversion efficiency. Flow behaviour can be predicted using computational fluid dynamics (CFD). This study investigates the application of CFD to modelling flow in a 2D system consisting of a catalyst monolith downstream of a wide-angled planar diffuser presented with steady flow. Two distinct approaches, porous medium and individual channels, are used to model monoliths of length 27 mm and 100 mm. Flow predictions are compared to particle image velocimetry (PIV) measurements made in the diffuser and hot wire anemometry (HWA) data taken downstream of the monolith. Both simulations compare favourably with PIV measurements, although the models underestimate the degree of mixing in the shear layer at the periphery of the emerging jet. Tangential velocities are predicted well in the central jet region but are overestimated elsewhere, especially at the closest measured distance, 2.5 mm from the monolith. The individual channels model is found to provide a more consistently accurate velocity profile downstream of the monolith. Maximum velocities, on the centre line and at the secondary peak near to the wall, are reasonably well matched for the cases where the flow is more maldistributed. Under these conditions, a porous medium model remains attractive because of low computational demand