4,259 research outputs found
On Einstein-Hilbert type action of superon-graviton model(SGM)
The fundamental action of superon-graviton model(SGM) of Einstein-Hilbert
type for space-time and matter is written down explicitly in terms of the
fields of the graviton and superons by using the affine connection formalism
and the spin connection formalism. Some characteristic structures including
some hidden symmetries of the gravitational coupling of superons are manifested
(in two dimensional space-time) with some details of the calculations. SGM
cosmology is discussed briefly.Comment: 20 pages, Latex, some more discussions and new references adde
Model for the unidirectional motion of a dynein molecule
Cytoplasmic dyneins transport cellular organelles by moving on a microtubule
filament. It has been found recently that depending on the applied force and
the concentration of the adenosine triphosphate (ATP) molecules, dynein's step
size varies. Based on these studies, we propose a simple model for dynein's
unidirectional motion taking into account the variations in its step size. We
study how the average velocity and the relative dispersion in the displacement
vary with the applied load. The model is amenable to further extensions by
inclusion of details associated with the structure and the processivity of the
molecule.Comment: 10 pages, 5 figure
Application of photodiodes to the detection of electromagnetic bursts
A new type of photodiode + scintillator (1 m2 x 1 cm) detector is developed to detect the large electro-magnetic burst under an EX-chamber. The threshold burst size is found to be 4.3 x 10 the 5 particles at the center of the scintillator. Therefore a gamma-ray family of 10 TeV is detectable by it, when it is set under 14 r.1. of iron. In addition, a very fast (2.4 nsec width) and very bright (correspond to 10 to the 6 particles) scintillation pulse has become avarable for this study
Tuning the electrical resistivity of semiconductor thin films by nanoscale corrugation
The low-temperature electrical resistivity of corrugated semiconductor films
is theoretically considered. Nanoscale corrugation enhances the
electron-electron scattering contribution to the resistivity, resulting in a
stepwise resistivity development with increasing corrugation amplitude. The
enhanced electron scattering is attributed to the curvature-induced potential
energy that affects the motion of electrons confined to a thin curved film.
Geometric conditions and microscopic mechanism of the stepwise resistivity are
discussed in detail.Comment: 13 pages, 8 figure
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