54,807 research outputs found
Mass and Isotope Dependence of Limiting Temperatures for Hot Nuclei
The mass and isotope dependence of limiting temperatures for hot nuclei are
investigated. The predicted mass dependence of limiting temperatures is in good
agreement with data derived from the caloric curve data. The predicted isotope
distribution of limiting temperatures appears to be a parabolic shape and its
centroid is not located at the isotope on the -stability line(T=0) but
at neutron-rich side. Our study shows that the mass and isotope dependence of
limiting temperatures depend on the interaction and the form of surface tension
and its isopin dependence sensitively.Comment: 14 pages,11 figure
Remarks on minimal rational curves on moduli spaces of stable bundles
Let M be the moduli space of stable bundles of rank 2 and with fixed
determinant \mathcal{L} of degree d on a smooth projective curve C of genus g>=
2. When g=3 and d is even, we prove, for any point [W]\in M, there is a minimal
rational curve passing through [W], which is not a Hecke curve. This
complements a theorem of Xiaotao Sun
Block-Matching Optical Flow for Dynamic Vision Sensor- Algorithm and FPGA Implementation
Rapid and low power computation of optical flow (OF) is potentially useful in
robotics. The dynamic vision sensor (DVS) event camera produces quick and
sparse output, and has high dynamic range, but conventional OF algorithms are
frame-based and cannot be directly used with event-based cameras. Previous DVS
OF methods do not work well with dense textured input and are designed for
implementation in logic circuits. This paper proposes a new block-matching
based DVS OF algorithm which is inspired by motion estimation methods used for
MPEG video compression. The algorithm was implemented both in software and on
FPGA. For each event, it computes the motion direction as one of 9 directions.
The speed of the motion is set by the sample interval. Results show that the
Average Angular Error can be improved by 30\% compared with previous methods.
The OF can be calculated on FPGA with 50\,MHz clock in 0.2\,us per event (11
clock cycles), 20 times faster than a Java software implementation running on a
desktop PC. Sample data is shown that the method works on scenes dominated by
edges, sparse features, and dense texture.Comment: Published in ISCAS 201
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