15,069 research outputs found
Mixing of quasiparticle excitations and gamma-vibrations in transitional nuclei
Evidence of strong coupling of quasiparticle excitations with gamma-vibration
is shown to occur in transitional nuclei. High-spin band structures in
[166,168,170,172]Er are studied by employing the recently developed
multi-quasiparticle triaxial projected shell model approach. It is demonstrated
that a low-lying K=3 band observed in these nuclei, the nature of which has
remained unresolved, originates from the angular-momentum projection of
triaxially deformed two-quasiparticle (qp) configurations. Further, it is
predicted that the structure of this band depends critically on the shell
filling: in [166]Er the lowest K=3 2-qp band is formed from proton
configuration, in [168]Er the K=3 neutron and proton 2-qp bands are almost
degenerate, and for [170]Er and [172]Er the neutron K=3 2-qp band becomes
favored and can cross the gamma-vibrational band at high rotational
frequencies. We consider that these are few examples in even-even nuclei, where
the three basic modes of rotational, vibrational, and quasi-particle
excitations co-exist close to the yrast line.Comment: 7 pages, 6 figure
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Propagation of Himalayan maple (Acer caesium Wall.) through seed and softwood cuttings
Propagation of Himalayan maple (Acer caesium Wall.) through seed and softwood cuttings was investigated to standardize nursery techniques for mass production of the species. The seedlings were raised from viable seeds in different containers filled with different combinations of growing media. Vegetative propagation of softwoodcuttings was carried out by treating with different combinations of IBA and Willow leachate of different durations. The statistical analysis revealed the differential behaviour of various nursery stocks with respect to survival, growth and biomass. The growing media soil:sand:vermicompost (2:1:2) and container (root trainer 300 cc) showed maximum germination (61.00%), seedlings height (35.17 cm), collar diameter (5.07 cm), shoot:root ratio (1.24) and survival percentage (76.33%). Conversely, the cuttings treated with IBA @ 8000 ppm showed maximum sprouting (74.50%), rooting (66.75%), length of longest root (14.65 cm), no. of roots per cutting (33.00%), shoot length (13.90 cm) and survival percentage (41.50%). Hence, the seeds of the species should be grown in Rot trainer of 300 cc having soil:sand:vermicompost (2:1:2) to get good quality planting materials. However, the softwood cuttings should be given treatments with IBA @ 8000 ppm for mass production of plants vegetatively
Computer model calibration with large non-stationary spatial outputs: application to the calibration of a climate model
Bayesian calibration of computer models tunes unknown input parameters by
comparing outputs with observations. For model outputs that are distributed
over space, this becomes computationally expensive because of the output size.
To overcome this challenge, we employ a basis representation of the model
outputs and observations: we match these decompositions to carry out the
calibration efficiently. In the second step, we incorporate the non-stationary
behaviour, in terms of spatial variations of both variance and correlations, in
the calibration. We insert two integrated nested Laplace
approximation-stochastic partial differential equation parameters into the
calibration. A synthetic example and a climate model illustration highlight the
benefits of our approach
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