WARM STANDBY REPAIRABLE SYSTEM CONSISTS OF TWO COMPONENTS WITH PRIORITY AND A UNRELIABLE SWITCH

Based on References, the paper studies a more commonly used system in project, that is, under the condition of unreliable switch, we study the warm standby repairable system which consists of two components with priority and a repair facility. A repairable model of this system is set up where both the lifetime and repaired time of the components and the switch obey the general time-distribution and the system fails immediately when the switch fails. Finally, several reliability indices of this model are obtained. Key words: Priority, Warm Standby Repairable System, Markov Renewal Proces

Tetra-n-propyl­ammonium acetate–boric acid (1/1)

In the crystal structure of the ammonium carboxyl­ate–boric acid cocrystal, (C3H7)4N+·CH3CO2 −·H3BO3, the boric acid forms two O—H⋯O hydrogen bonds to the acetate anion. The acetate–boric acid species is hydrogen bonded to another acetate–boric acid species through the third OH unit of the boric acid about a twofold rotation axis

Bis(tetra­methyl­ammonium) oxalate monohydrate

In the crystal structure of the title hydrated salt, 2C4H12N+·C2O4 2−·H2O, the two independent cations, the anion and the water mol­ecule all lie on special positions of m site symmetry. In both cations, the mirror plane passes through the nitrogen atom and two methyl groups; in the anion, the mirror plane passes through two carbon and two oxygen atoms. The anions and water mol­ecules inter­act by O—H⋯O hydrogen bonding, forming a chain running along the b axis

Tris(tetra­ethyl­ammonium) hydrogen bis­[2-(sulfatosulfan­yl)benzoate]

The reaction between tetra­ethyl­ammonium hydroxide and 2,2′-dithio­benzoic acid yields the title compound, 3C8H20N·H(C6H4O5S2)2 3−, the trianion of which comprises two 2-(sulfato­sulfan­yl)benzoate dianions linked across a center of inversion by an acid H atom. One of the cations is disordered about another center of inversion