Browsing Exact and Earth Sciences by Issue Date
Now showing items 61-80 of 5943
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Einstein A coefficients, oscillator strengths and lifetimes for some selected triplet-triplet transitions of N2 : a comparison between theory and experiment
(1980) [Journal article]Einstein A coefficients, oscillator strengths and lifetimes have been calculated by an asymptotic expansion method, introduced by Chang and Karplus, for the N2, B 3Πg→A 3Σ+u (first positive), C 3Πu→B 3Πg (second positive), ... -
Mossbauer effect study of cu/sub 2/mnal/sub 1-x/sn/sub x/ compounds
(1980) [Journal article]Results of a Mõssbauer effect study of a range of Cu2MnA1t-xSnx compounds are presented for x=0.05, 0.10, 0.15, 0.25, 0.50, and 0.75. The hyperfine magnetic field at Sn nuclei is proportional to a number of Sn atoms ... -
Gamma-gamma directional correlations for transitions in /sup 84/kr
(1980) [Journal article]The directional correlation of coincident 'Y transitions in 84Kr have been measured following the decay of 32 min 84Br using a Ge(Li)-Nai(TI) spectrometer. Measurements have been carried out for ten gamma cascades, resulting ... -
Saturation of the massive Schwinger model
(1980) [Journal article]We determine the field configurations saturating the massive Schwinger model (MSM). Fermion confinement is proved, for the MSM, without invoking the Bose form of the theory. A gas of induced instantons accounts for the ... -
Effective polarization in quasi-free scattering
(1980) [Journal article]A simple relation, involving only experimental quantmes, for the effective polarizations m quasi-free (p, 2p) scattering on closed shell nuclei IS tested for recent TRIUMF (p, 2p) experiments with 200 MeV polanzed protons. -
Accuracy of the maximum entropy method
(1980) [Journal article]Although the maximum entropy method is capable of giving the period of a pure sine wave with very few data points, it is very sensitive to noise. The half power width of a spectral peak obtained by this method is proportional ... -
Some matrix elements for morse oscillators
(1980) [Journal article]In this paper general working equations for the Morse (r-r,)' rnatrix elements are given. These equations can be used to calculate the diagonal (m = n ) matrix elements and, for the off-diagonal (m≠n) elements, are simpler ... -
Electric field gradients and impurity distributions in doped noble metals : a systematic study
(1980) [Journal article]The electric field gradients created at 111Cd nuclei by dilute transition-element impurities in noble metais are studied by the technique of time-differential perturbed angular correlation. The present results supplement ... -
Uniqueness of the functional approach
(1980) [Journal article]It is shown that the phase-space Schwinger equations can only be appropriately formulated in terms of a specific discrete procedure. Nevertheless, the solutions to Schwinger equations turn out to be independent of the ... -
Investigation of nuclear structure by quasi-free scattering with polarized protons
(1981) [Journal article]Quasi-free scattering with polarized protons can be a sensitive method to probe certain spin correlations in the nuclear wave function. This is demonstrated by the comparison of the effective polarizations following from ... -
Study of the nuclei of NGC 3732 and IC 4662
(1981) [Journal article]The nuclei of two galaxies which show intense [O III] emission lines, NGC 3732, an Sa, and IC 4662, an irregular with a very bright nucleus, are analyzed spectroscopically. The physical condition of the emitting gas and ... -
Coherent and incoherent radiation from free-electron lasers with an axial guide field
(1981) [Journal article]The spontaneous and induced emission from a free-electron laser is treated for the case in which an axial magnetic field is imposed in addition to the helical, axially periodic wiggler magnetic field. The classes of possible ... -
Measurements of the equivalent width of the h/sub beta/ emission line and age determination of hii regions of the lmc and smc
(1981) [Journal article]The equivalent width of the emission line Hβ was measured photoelectrically in 29 H II regions of the LMC and 2 of the SMC respectively. The age of these regions was obtained through a calibration of Wʜβ. A relation was ... -
Threshold shifting of nmos transitions by arsenic ion implantation prior to gate oxidation
(1981) [Journal article]This paper reports on the threshold adjustment of NMOS transistors by arsenic ion implantation in the channel region directly into bare silicon just before the gate oxidation. Experimental results showed very good uniformity ... -
The influence of tin implantation on the oxidation of iron
(1981) [Journal article]The high-temperature oxidation of metallic iron implanted with Sn ions at doses between 5 X 10 15 and 5 X 10 16 Sn ions cm-² is studied in the temperature range from 300 to 500 °c. Ion implantation of Sn reduces the oxidation ... -
Detrapping of vacancies at in/sup 111/ in quenched silver
(1981) [Journal article]The isothermal recovery of a quenched Ag foil doped with 111 ln has been studied through the time-differential perturbed-angular-correlation technique. A nearest-neighbor-vacancy configuration has produced a quadrupole ... -
Quantization of gauge-invariant theories through the dirac-bracket formalism
(1981) [Journal article]A physical system possessing first-class constraints is quantized by using the Dirac-bracket formalism. The main features of this quantization procedure are analyzed. The model enables us to present a situation where ... -
Electrical Resistance and Crystallization Characteristics of Fe/Sub 80/B/Sub 20/a
(1981) [Journal article]The electrical resistance of amorphous Fe80B20 has been measured as a function of time at various temperatures during an isothermal crystallization process. The results fit a universal curve when ∆R/∆R1 is plotted against ... -
Anisotropic rare-earth spin-glasses
(1982) [Journal article]We present magnetic measurements (ac and de susceptibilities and magnetization) on YEr and YGd single crystals. The longitudinal (i.e., along the c axis) susceptibility of YEr shows a typical spin-glass-like cusp, whereas ... -
Iron nitride and carbonitride phases in a nitrogen implanted carbon steel
(1982) [Journal article]Iron nitride and carbonitride phases formed during nitrogen implantation and subsequent thermal annealing of a medium-carbon steel are investigated by means of conversion electron Mossbauer scattering. The results are ...
