Abstract In this paper, the pulsating combustion of a premixed propane-butane fuel with air in vortex chamber is considered. The conclusion refined frequency equation made. characteristic mixture supply system given.

VOCs are used ubiquitously in consumer products. This population study investigates a wide-range of VOC concentrations indoors and links high butane with universal frequent aerosol use.

In the title compound, [Ni(C(6)H(16)N(2))(2)](NO(3))(2)·H(2)O, the bis-(2,3-dimethyl-butane-2,3-diamine)nickel(II) complex cation possesses a relatively undistorted square-planar geometry about the Ni atom, which lies on an inversion centre and is coordinated by four N atoms from two symmetry-related 2,3-diamino-2,3-dimethyl-butane (tmen) ligands. The amine groups are N-H⋯O hydrogen bonded to t...

The whole mol-ecule of the title β-enamino-ester, C(16)H(28)N(2)O(4), is generated by a crystallographic inversion center, situated at the mid-point of the central C-C bond of the 1,4-diamino-butane segment. There are two intra-molecular N-H⋯O hydrogen bonds that generate S(6) ring motifs. This leads to the Z conformation about the C=C bonds [1.3756 (17) Å]. The mol-ecule is S-shaped with the p...

In the polymeric title compound, {[Cd(C(8)H(12)N(6))(H(2)O)(4)]SO(4)}(n), the Cd(II) atom is located on an inversion center and coordinated by four water mol-ecules and two 1,4-bis-(1,2,4-triazol-yl)butane ligands in a distorted CdO(4)N(2) octa-hedral geometry. The 1,4-bis-(1,2,4-triazol-yl)butane ligand is centrosymmetric, the mid-point of the central C-C bond being located on an inversion cen...

The novel water-soluble N-methyl-D-aspartate (NMDA) receptor antagonists, N-{4-[4-(4-Guanidinobutylamino)butylamino]butyl}-p-toluenesulfonamide trihydrochloride (1a, TsHSPMG), N-{4-[4-(4-Guanidinobutylamino)butylamino]butyl}butane-1-sulfonamide trihydrochloride (1b, BsHSPMG), N-{3-[4-(3-Guanidinopropylamino)butylamino]propyl}-p-toluenesulfonamide trihydrochroride (2a, TsSPMG) and N-{3-[4-(3-Gua...