Hidden-gauge model and radiative decays

We consider the radiative decay widths in a hidden-gauge model. For calculating the decay widths we use the anomalousVVP Lagrangian.g _VVP is a function off _P due to the symmetry breaking effects. It is shown thatf _P is consistent with that obtained by the one-loop calculation. A reasonable agreement with the experimental decay widths is achieved.     

Alkali metal mediated conversion of arene oxides and arene imines into aromatic hydrocarbons

K-Region oxides and imines of phenanthrene, chrysene benz[a]anthracene, and dibenz[a,h]anthracene react in tetrahydrofuran with lithium and sodium to give the parent hydrocarbons. In the presence of excessive metal, the latter are converted into dianions from which the parent compounds can be regenerated upon quenching with oxygen. Metalate derivatives of the oxides and imines are proposed to be the corresponding reaction intermediates in the deoxygenation and deamination processes.     

A rigorous time domain analysis of gyrotrons

A self-consistent time domain analysis of gyrotrons is presented which allows studying multi-mode, multi-frequency operation. The electromagnetic field in the gyrotron cavity is expanded with respect to complete sets of eigenfunctions so that space charge effects are included in the analysis. Two improvements of the modal expansion inside gyrotron cavities are suggested which significantly increase the accuracy and the numerical efficiency of this method, namely, the removal of the non-uniform convergence of some field series at the coupling apertures and the estimation of the asymptotic values of some slowly converging series related to the modal analysis by a moderate number of cavity eigenfunctions. Discrete Fourier transform is used to obtain the time dependence of the electromagnetic field. The electron beam is described by a set of relativistic single particles. It is demonstrated that the strong numerical requirements of the suggested method can be overcome by using a vector computer. Two gyrotrons are investigated, namely, a low Q 35 GHz TE₀₁- and a 150 GHz TE₀₃-gyrotron. Both oscillation build-up and steady state operation are investigated including mode competition and window reflections. The simulations show that the assumption of a monofrequent steady state operation of gyrotrons, which is made by the commonly used frequency domain methods, is not always justified.     

Studies in polarographic analysis : Determination of manganese after oxidation to the manganic state stabilized by triethanolamine

The manganic complex with triethanolamine, prepared by the oxidation of manganous solution in presence of 0.5M NaOH and 4% by volume triethanolamine with atmospheric oxygen, is found suitable for the polarographic determination of manganese. Under these conditions, the diffusion current is proportional to the Mn⁺² concentration from 2.10^-4·7.10^-3ME$\text{1}\text{2}$,for the Mn⁺³/Mn⁺² wave = — 0.5 V vs S.C.E. The temperature coefficient for the diffusion current 1.2% per degree I and D° decrease by increasing the alkali or triethanolamino concentration. They amount in presence of NaOH = 0.5M and 4% triethanolamine to I = 1.27 and D° = 4.18·10^-6 cm²/sec.     

The Mechanism of the Reactions Mg24 (d,p.) Mg23 and Mg26 (d,p.) Mg27 in the Deuteron Energy Range 1.3-2.5 MeV

The differential excitation functions of the low lying levels for the reactions Mg²⁴ (d, p) Mg²⁵ and Mg²⁶ (d, p.) Mg²⁷ have been measured in steps of 10 KeV in a deuteron energy range 1.3-2.5 MeV and at angles 20°–160y in steps of 20°. Thin isotopic targets (0.45 μ gm/cm²) on Ni backing (0.5 micron) were used. Auto-correlations, angular and group crosscorrelations, and probability distributions were calculated in terms of ERIOSON's theory of statistical fluctuations. The mean coherence width Γ for both reactions was found to be equal to 32 KeV which corresponds to a life time τ = 2.1 × 10^?20 sec. of the compound nucleus formation.     

Investigation of a route to ibotenic acid analogues via a reduced pyroglutamate template

Two alternative "ring switch" based syntheses have been shown to give access to the reduced protected homochiral analogues, 27, 28 and 36, of the CNS active compound ibotenic acid.