24,039 research outputs found
Pole Positions of the Delta(1232) Resonance
The phase shift of pion nucleon elastic scattering D33, corresponding to
isospin I=3/2 and angular momentum J=3/2, has been parameterized over the range
1100 < W < 1375 MeV, using the single channel p Pi+ data from CNS-DAC. By
employing our four parameters formula, the pole positions of corresponding to
the Delta(1232) resonance are then identified.Comment: 5 Pages, 1 Figure, 1 Tabl
Parameterization of the phase shift D33 for Pi-N Scattering
From the partial wave analysis, the phase shift D33 of pion nucleon
scattering containing the D(1232) resonance, corresponding to isospin I=3/2 and
angular momentum J=3/2, has been parameterized over the energy range 1100 < W <
1375 MeV, using p-Pi+ data. The result of our parameterization shows good
agreement in comparison with the available experimental data.Comment: 4 Pages, 2 Figur
Backbending Effect in Deformed e-e Nuclei
An extension of the previously proposed Variable Moment of Inertia with
Softness model VMIS has been applied to describe successfully the effect of
backbending in some deformed e-e nuclei. The model shows good results in the
rare earth and actinide regions.Comment: 8 pages, 1 figure (1x22), 2 tables (2x1&1x1
Kinematic Moment of Inertia of e-e Rare Earths Nuclei
The kinematic moment of inertia of the rare earth even-even nuclei was
calculated using three parametric energy based expression. The plot of
kinematic moment of inertia versus nuclear spin shows a better sensitivity to
back bending than energy plot.Comment: 2 Figures, 1 Tabl
Scattering Amplitude of {\pi}N on the Second Sheet
We propose parameterization procedures of the scattering amplitude
f_{1+}^{3}(s)) with a view to extracting the pole parameters from data in the
elastic region of {\pi}N scattering. This is achieved by considering the
analyticity properties of partial wave amplitudes directly and writing
dispersion relations for the amplitude explicitly.Comment: 2 Figures, 1 Tabl
Transition Matrix Elements for Pion Photoproduction
We have obtained the transition matrix elements for pion photoproduction by
considering the number of gamma matrices involved. The approach based on the
most general conditions of gauge invariance, current conservation and
transversality. The approach is fairly consistent with literatures.Comment: 6 pages, 1 Figur
Clustering with Obstacles in Spatial Databases
Clustering large spatial databases is an important problem, which tries to
find the densely populated regions in a spatial area to be used in data mining,
knowledge discovery, or efficient information retrieval. However most
algorithms have ignored the fact that physical obstacles such as rivers, lakes,
and highways exist in the real world and could thus affect the result of the
clustering. In this paper, we propose CPO, an efficient clustering technique to
solve the problem of clustering in the presence of obstacles. The proposed
algorithm divides the spatial area into rectangular cells. Each cell is
associated with statistical information used to label the cell as dense or
non-dense. It also labels each cell as obstructed (i.e. intersects any
obstacle) or nonobstructed. For each obstructed cell, the algorithm finds a
number of non-obstructed sub-cells. Then it finds the dense regions of
non-obstructed cells or sub-cells by a breadthfirst search as the required
clusters with a center to each region.Comment: In Proc. 2001 IEEE Int. Symposium of Signal Processing and
Information Technology (ISSPIT01), pages 420-425, Cairo, Egypt, Dec. 200
Algorithm for Spatial Clustering with Obstacles
In this paper, we propose an efficient clustering technique to solve the
problem of clustering in the presence of obstacles. The proposed algorithm
divides the spatial area into rectangular cells. Each cell is associated with
statistical information that enables us to label the cell as dense or
non-dense. We also label each cell as obstructed (i.e. intersects any obstacle)
or non-obstructed. Then the algorithm finds the regions (clusters) of
connected, dense, non-obstructed cells. Finally, the algorithm finds a center
for each such region and returns those centers as centers of the relatively
dense regions (clusters) in the spatial area.Comment: In Proc. 2002 ICICIS Int. Conference on Intelligent Computing and
Information Systems (ICICIS02), Cairo, Egypt, June 200
Lattice point visibility on power functions
It is classically known that the proportion of lattice points visible from
the origin via functions of the form with is
where is the classical Reimann zeta function.
Goins, Harris, Kubik and Mbirika, generalized this and determined the
proportion of lattice points visible from the origin via functions of the form
with and is
. In this article, we complete the analysis of
determining the proportion of lattice points that are visible via power
functions with rational exponents, and simultaneously generalize these previous
results.Comment: 6 pages, 1 figur
Post-disaster 4G/5G Network Rehabilitation using Drones: Solving Battery and Backhaul Issues
Drone-based communications is a novel and attractive area of research in
cellular networks. It provides several degrees of freedom in time (available on
demand), space (mobile) and it can be used for multiple purposes (self-healing,
offloading, coverage extension or disaster recovery). This is why the wide
deployment of drone-based communications has the potential to be integrated in
the 5G standard. In this paper, we utilize a grid of drones to provide cellular
coverage to disaster-struck regions where the terrestrial infrastructure is
totally damaged due to earthquake, flood, etc. We propose solutions for the
most challenging issues facing drone networks which are limited battery energy
and limited backhauling. Our proposed solution based mainly on using three
types of drones; tethered backhaul drone (provides high capacity backhauling),
untethered powering drone (provides on the fly battery charging) and untethered
communication drone (provides cellular connectivity). Hence, an optimization
problem is formulated to minimize the energy consumption of drones in addition
to determining the placement of these drones and guaranteeing a minimum rate
for the users. The simulation results show that we can provide unlimited
cellular service to the disaster-affected region under certain conditions with
a guaranteed minimum rate for each user.Comment: 2018 IEEE Global Communications Conference: Workshops: 9th
International Workshop on Wireless Networking and Control for Unmanned
Autonomous Vehicle
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