Results 241 to 250 of about 2,507,189 (293)
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Nuclear Physics A, 1974
Abstract The de-excitation of the 215 keV 7 2 + and 324 keV 5 2 + levels in 97 Tc, as observed in 97 Ru decay, was studied by means of internal conversion electron spectroscopy and the delayed electron-electron coincidence technique.
C. Bergman +4 more
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Abstract The de-excitation of the 215 keV 7 2 + and 324 keV 5 2 + levels in 97 Tc, as observed in 97 Ru decay, was studied by means of internal conversion electron spectroscopy and the delayed electron-electron coincidence technique.
C. Bergman +4 more
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Interband transition rate in GaAs
Physical Review B, 1991Starting from a quantum-kinetic Boltzmann equation, the scattering rate for interband transition processes in GaAs is calculated numerically, taking into account a realistic band structure with corresponding Bloch wave functions. We compare with approximate solutions for this scattering rate such as the Keldysh or the Bethe formula, which are ...
, Stobbe +4 more
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Semiparametric transition rate models
2019The most widely applied semiparametric model is the proportional hazards model proposed by D. R. Cox, or, as stated in the literature, the Cox model. The Cox model has been used widely, although the proportionality assumption restricts its range of possible empirical applications. This chapter explains the partial likelihood estimation of the model. It
Hans-Peter Blossfeld +3 more
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Nuclear Physics A, 1971
From data obtained with a double-lens electron coincidence spectrometer and iron-yoke double-focusing spectrometers, the half-life of the 31.6 keV level in 192Au has been determined to be 0.69 ± 0.02 nsec, and the de-exciting transition has been found to have a multipolarity of M1 + (0.66 ± 0.05)% E2. The E2 part of this transition is strongly enhanced,
Å. Höglund +4 more
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From data obtained with a double-lens electron coincidence spectrometer and iron-yoke double-focusing spectrometers, the half-life of the 31.6 keV level in 192Au has been determined to be 0.69 ± 0.02 nsec, and the de-exciting transition has been found to have a multipolarity of M1 + (0.66 ± 0.05)% E2. The E2 part of this transition is strongly enhanced,
Å. Höglund +4 more
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Nuclear Physics A, 1972
Abstract The lifetimes of a number of levels in 89 Zr have been measured with the Doppler-shift attenuation method using the 89 Y(p, nγ) 89 Zr reaction and observing the γ-rays in a Ge(Li) detector. The results are: τ (1628) = 370 ± 50fs, τ (1743) = 710 ± 180 fs, τ (1835) = 460 ± 190 fs, τ (2100) = 180 ± 60 fs, τ (2298) = 105 ± 30 fs, τ (2388)
R.D. Gill +3 more
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Abstract The lifetimes of a number of levels in 89 Zr have been measured with the Doppler-shift attenuation method using the 89 Y(p, nγ) 89 Zr reaction and observing the γ-rays in a Ge(Li) detector. The results are: τ (1628) = 370 ± 50fs, τ (1743) = 710 ± 180 fs, τ (1835) = 460 ± 190 fs, τ (2100) = 180 ± 60 fs, τ (2298) = 105 ± 30 fs, τ (2388)
R.D. Gill +3 more
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Nuclear Physics A, 1969
Abstract The decay of 161 Tb has been studied using a high-resolution Ge(Li) detector. Five new transitions were observed and fitted into the earlier proposed decay scheme. The half-life of the 131.8keV level in 161 Dy was determined in a delayed-coincidence measurement to be 145 ±15 psec.
V. Berg, S.G. Malmskog
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Abstract The decay of 161 Tb has been studied using a high-resolution Ge(Li) detector. Five new transitions were observed and fitted into the earlier proposed decay scheme. The half-life of the 131.8keV level in 161 Dy was determined in a delayed-coincidence measurement to be 145 ±15 psec.
V. Berg, S.G. Malmskog
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A critical look at transition ratings
Journal of Clinical Epidemiology, 2002Patient ratings of the extent to which they have improved or deteriorated-transition ratings-are extremely common in clinical practice and clinical research. However, some have raised concerns about transition rating validity. We examined data from three studies, each of which explored the relation between a disease-specific health-related quality of ...
Gordon H, Guyatt +3 more
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Transition rates and transition rate diagrams in atomic emission spectroscopy: A review
Spectrochimica Acta Part B: Atomic Spectroscopy, 2015Abstract In low pressure plasmas with low electron densities, such as glow discharges, radiative de-excitation is a major de-excitation process of most excited states. Their relative de-excitation rates can be determined by emission spectroscopy, making it possible to study excitation processes in these discharges.
Zdeněk Weiss +2 more
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Transition rates in a stochastic medium
Physical Review A, 1992A description of noise-induced reaction rates in a fluctuating medium is presented. The environment is assumed to exist in a number of distinct configurations and transitions between these configurations are governed by a Markov process. The environment fluctuations drive transitions between reactant and product regions described by a set of ...
, Gaveau +3 more
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Heart rate variability during gravity transitions
Computers in Cardiology, 2003During parabolic flight short periods of microgravity and hypergravity are created. During standing position time domain analysis showed higher vagal modulation of the autonomic nervous system in microgravity compared to hypergravity. We hypothesised that this behaviour could better be unravelled by analysis of frequency domain heart rate variability ...
B, Seps, F, Beckers, A E, Aubert
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