3,472 research outputs found
Full Glowworm Swarm Optimization Algorithm for Whole-Set Orders Scheduling in Single Machine
By analyzing the characteristics of whole-set orders problem and combining the theory of glowworm swarm optimization, a new glowworm swarm optimization algorithm for scheduling is proposed. A new hybrid-encoding schema combining with two-dimensional encoding and random-key encoding is given. In order to enhance the capability of optimal searching and speed up the convergence rate, the dynamical changed step strategy is integrated into this algorithm. Furthermore, experimental results prove its feasibility and efficiency
Axionlike-particle generation by laser-plasma interaction
Axion, a hypothetical particle that is crucial to quantum chromodynamics and
dark matter theory, has not yet been found in any experiment. With the
improvement of laser technique, much stronger quasi-static electric and
magnetic fields can be created in laboratory using laser-plasma interaction. In
this article, we discuss the feasibility of axion or axionlike-particle's
exploring experiments using planar and cylindrically symmetric laser-plasma
fields as backgrounds while probing with an ultrafast superstrong optical laser
or x-ray free-electron laser with high photon number. Compared to classical
magnet design, the axion source in laser-plasma interaction trades the
accumulating length for the source's interacting strength. Besides, a
structured field in the plasma creates a tunable transverse profile of the
interaction and improves the signal-noise ratio via the mechanisms such as
phase-matching. The mass of axion discussed in this article ranges from 1
\textmu eV to 1 eV. Some simple schemes and estimations of axion production and
probe's polarization rotation are given, which reveals the possibility of
future laser-plasma axion source in laboratory.Comment: 24 pages, 5 figure
Generation of Intense High-Order Vortex Harmonics
This paper presents the method for the first time to generate intense
high-order optical vortices that carry orbital angular momentum in the extreme
ultraviolet region. In three-dimensional particle-in-cell simulation, both the
reflected and transmitted light beams include high-order harmonics of the
Laguerre-Gaussian (LG) mode when a linearly polarized LG laser pulse impinges
on a solid foil. The mode of the generated LG harmonic scales with its order,
in good agreement with our theoretical analysis. The intensity of the generated
high-order vortex harmonics is close to the relativistic region, and the pulse
duration can be in attosecond scale. The obtained intense vortex beam possesses
the combined properties of fine transversal structure due to the high-order
mode and the fine longitudinal structure due to the short wavelength of the
high-order harmonics. Thus, the obtained intense vortex beam may have
extraordinarily promising applications for high-capacity quantum information
and for high-resolution detection in both spatial and temporal scales because
of the addition of a new degree of freedom
4,5-Bis(isopropylÂsulfanÂyl)benzene-1,2-dicarbonitrile
In the title compound, C14H16N2S2, the C atoms of the aromatic ring, the two cyanide groups and the two S atoms of the isopropylÂsulfanyl groups are almost coplanar [maximum deviation from the mean plane = 0.042 (7) Å]. In the crystal, inversion dimers linked by aromatic π–π stacking occur, with a centroid–centroid separation of 3.7543 (8) Å
4-(PhenylÂsulfanÂyl)benzene-1,2-dicarbonitrile
In the title compound, C14H8N2S, the dicyano-substituted aromatic ring and the phenyl ring attached to the central S atom adopt an angular V-shaped configuration. The dihedral angle between the rings is 103.6°
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