6,073 research outputs found
A Sawtooth Permanent Magnetic Lattice for Ultracold Atoms and BECs
We propose a new permanent magnetic lattice for creating periodic arrays of
Ioffe-Pritchard permanent magnetic microtraps for holding and controlling
ultracold atoms and Bose-Einstein condensates (BECs). Lattice can be designed
on thin layer of magnetic films such as . In
details, we investigate single layer and two crossed layers of sawtooth
magnetic patterns with thicknesses of 50 and 500nm respectively with a
periodicity of 1m. Trap depth and frequencies can be changed via an
applied bias field to handle tunneling rates between lattice sites. We present
analytical expressions and using numerical calculations show that this lattice
has non-zero potential minima to avoid majorana spin flips. One advantage of
this lattice over previous ones is that it is easier to manufacture.Comment: 8 pages, 6 figure
Image quality assessment based on harmonics gain/loss information
We present an objective reduced-reference image quality assessment method based on harmonic gain/loss information through a discriminative analysis of local harmonic strength (LHS). The LHS is computed from the gradient of images, and its value represents a relative degree of the appearance of blockiness on images when it is related to energy gain within an image. Furthermore, comparison between local harmonic strength values from an original, distortion-free image and a degraded, processed, or compressed version of the image shows that the LHS can also be used to indicate other types of degradations, such as blurriness that corresponds with energy loss. Our simulations show that we can develop a single metric based on this gain/loss information and use it to rate the quality of images encoded by various encoders such as DCT-based JPEG, wavelet-based JPEG 2000, or various processed images. We show that our method can overcome some limitations of the traditional PSNR
More on energy and Randic energy of specific graphs
Let be a simple graph of order . The energy of the graph is
the sum of the absolute values of the eigenvalues of . The Randi\'{c} matrix
of , denoted by , is defined as the matrix whose
-entry is if and are adjacent and
for another cases. The Randi\'{c} energy of is the sum of absolute
values of the eigenvalues of . In this paper we compute the energy and
Randi\'{c} energy for certain graphs. Also we propose a conjecture on Randi\'c
energy.Comment: 14 page
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