Stability constants and thermodynamic functions of Y(III), Rh(III), Sm(III), Gd(III) and Dy(III) with juglone (5-hydroxy-1,4-naphthoquinone)

This work considers how the ratio signal/noise and the introduction of a cut-off frequency affect the calculus of the thermogenesis. In particular, the validity of the experimental criterion used to calculate this frequency inside the deconvolutive calculus is studied. The deconvolutive efficiency of the universal transference function is also presented comparatively.     

Behaviour of a complex system having stand-by components in spares

Summary The reliability characteristics of a stand-by redundant complex system with instantaneous switch over have been discussed in two sections of this paper. In Section (I), it has been assumed that spare components can not fail in the stand-by interval where as in Section (II), it has been considered that they can fail even in the stand-by interval. TheLaplace-Stieltjes transforms of the distribution of the first time to system failure have been derived by using the signal flow graph method [Chow-Cassignol, 1962]. In the end, the mean time to system failure (MTSF) has also been evaluated.

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Zusammenfassung In diesem Artikel wird der Charakter der Zuverlässigkeit eines komplexen redundanten Systems mit Reserve, die ohne Zeitverzögerung eingeschaltet werden kann, in zwei Abschnitten diskutiert. Während im ersten Teil die Annahme gemacht wird, daß die Ersatzkomponenten nicht ausfallen können, bevor sie eingesetzt werden, wird im zweiten Teil diese Möglichkeit berücksichtigt. DieLaplace-Stieltjes Transformation der Verteilung der Zeit bis zum ersten Systemausfall wird mit der Signalfluß-Graphen-Methode erhalten. Zum Abschluß wird der Erwartungswert dieser Zeit berechnet.

     

Flash vacuum pyrolysis of 3-t-butylindeno[1,2-c]isoxazol-4-one. Formation of 2-carbonyl-1,3-indandione 2-azine

Flash Vacuum Pyrolysis (FVP) of 3-t-Butylindeno[1,2-c]isoxazol-4-one ( 1 ) and 3-t-Butylspiro[2H-azirine-2,2′-(2H)indene]-1′,3′-dione ( 2 ) were carried out. Reaction of 1 from 300–400° afford 2 and 2-carbonyl-1,3-indandione 2-azine ( 3 ) as the major products, whereas 2-t-Butylindeno[1,3-c]oxazol-4-one ( 4 ) was the main products in FVP of 2 together with minor amounts of 3.     

Quantum-mechanical treatment of molecules. I. Calculations of the potential energy curves and molecular constants of the ground and ionized states of N2

The self-consistent-field molecular-orbital method in LCAO (linear combination of atomic orbitals) approximation is applied to the ground and three ionized states of N₂ at a number of internuclear distances for the computation of the potential energy curves. In these calculations both the linear coefficients and the screening constants of the atomic orbitals have been optimized. The molecular constants ω_e, ω_ex_e, B_e, α_e, and R_e have also been calculated for the above states from the computed potential energy curves. The computed spectral results are compared with the experimental data as well as with the results reported by others from ab initio calculations.     

Synthesis and chemical reactivity of indenoisoxazoles

Treatment of 2-pivaloyl-1,3-indandione ( 1 ) with hydroxylamine under acidic conditions, results in formation of 8-t-butylindeno[1,2-c]isoxazol-7-one ( 2 ) while treatment of the triketone with hydroxylamine at neutral or basic pH gave 6 which upon cyclization gave the isomeric 3-t-butylindeno[1,2-c]isoxazol-4-one ( 7 ). Compound 7 was readily reduced to amine 12 by treatment with hydrazine or hydrogen over platinum. The amine, although quite unreactive, was converted to 3-t-butylindeno[1,2-c]pyrazol-4-one ( 13 ) with hydrazine or reduced to 15 and 16 with sodium in liquid ammonia and alcohol. Surprisingly, the amine 3 obtained from isoxazole 2 gave reduction product 15 from a sodium-liquid ammonia reduction and not the expected product 18. Spectral evidence for each of the structures is discussed.