18,389 research outputs found
GRB011211: An alternative interpretation of the optical and X-ray spectra in terms of blueshifts
The redshifts of the gamma ray burst (GRB) GRB 011211 has been determined as
2.14 from several absorption lines seen in the spectrum of its optical
afterglow. The spectrum of its X-ray afterglow exhibited several emission
lines,and their identification led to a mean redshift 1.862. A supernova model
has been proposed based on the redshift of the GRB as 2.141. It is shown here
that the redshift interpretation cannot explain the observed spectra, as some
serious inconsistencies exist in the process of redshift determinations in
spectra of both optical and X-ray afterglows. In view of that, an alternative
interpretation of the spectra is presented in terms of blueshifts. Ejection
mechanism is proposed as a possible scenario to explain the blueshifted
spectrum.Comment: 26 pages, one table; in Canadian Journal of Physics, June 200
On the extension of the Bethe-Weizsacker mass formula to light nuclei
Some general features of the Bethe-Weizsacker mass formula recently extended
to light nuclei have been explored. Though this formula improves fits to the
properties of light nuclei and it does seem to work well in delineating the
positions of all old and new magic numbers found in that region, yet it is not
well tuned for predicting finer details. The mass predictions have also been
found to be less accurate compared to those by the macroscopic-microscopic
calculations. It is concluded that such semi-empirical mass formulae can not be
a substitute for more fundamental mass formulae having its origin based upon
the basic nucleon-nucleon effective interaction.Comment: 3 page
Does Conditioning Information Matter in the Estimation of Continuous Time Interest Rate Diffusions?
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From Coherent States In Adjacent Graphene Layers Toward Low-Power Logic Circuits
Colleagues and we recently proposed a new type of transistor, a Bilayer PseudoSpin Field Effect Transistor (BiSFET), based on many-body coherent states in coupled electron and hole layers in graphene. Here we review the basic BiSFET device concept and ongoing efforts to determine how such a device, which would be far from a drop-in replacement for MOSFETs in CMOS logic, could be used for low-power logic operation, and to model the effects of engineerable device parameters on the formation and gating of interlayer coherent state.Electrical and Computer Engineerin
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