1,327 research outputs found
The Structure of No_3^- in Molten Monovalent Metal Nitrates by Pulsed Neutron Diffraction(Chemistry)
The structure factor of molten monovalent metal nitrates was measured over a wide range of scattering vectors by time-of-flight pulsed neutron diffraction using epithermal neutrons generated from an electron LINAC. It is found that the NO_3^- ion forms an isosceles triangle in molten LiNO_3, AgNO_3 and TINO_3, and a regular triangle in molten NaNO_3, KNO_3, RbNO_3 and CsNO_3
Ecological Rehabilitation and Restoration of Mangrove Forests and Coastal Swamp Ecosystems in Vietnam
Joint Research on Environmental Science and Technology for the Eart
Missions of Small Satellites Launched by the J-I Launch Vehicle
This paper presents the concept of the small satellites launched by the 1-1 launch vehicle of the National Space Development Agency of JAPAN (NASDA). On this concept, the missions of the small satellites are for the experiment and the validation of the earth observation. The satellite communications, and the others on orbit. For efficient achievements of these missions, the common satellite bus will be adopted for the solid launch vehicle J-I, in order to develop the each small satellite system quickly by low-cost
Gauge Theories in Noncommutative Homogeneous K\"ahler Manifolds
We construct a gauge theory on a noncommutative homogeneous K\"ahler
manifold, where we employ the deformation quantization with separation of
variables for K\"ahler manifolds formulated by Karabegov. A key point in this
construction is to obtaining vector fields which act as inner derivations for
the deformation quantization. We show that these vector fields are the only
Killing vector fields. We give an explicit construction of this gauge theory on
noncommutative and noncommutative .Comment: 27 pages, typos correcte
Gauge invariance of color confinement due to the dual Meissner effect caused by Abelian monopoles
The mechanism of non-Abelian color confinement is studied in SU(2) lattice
gauge theory in terms of the Abelian fields and monopoles extracted from
non-Abelian link variables without adopting gauge fixing.
Firstly, the static quark-antiquark potential and force are computed with the
Abelian and monopole Polyakov loop correlators, and the resulting string
tensions are found to be identical to the non-Abelian string tension. These
potentials also show the scaling behavior with respect to the change of lattice
spacing.
Secondly, the profile of the color-electric field between a quark and an
antiquark is investigated with the Abelian and monopole Wilson loops. The
color-electric field is squeezed into a flux tube due to monopole supercurrent
with the same Abelian color direction. The parameters corresponding to the
penetration and coherence lengths show the scaling behavior, and the ratio of
these lengths, i.e, the Ginzburg-Landau parameter, indicates that the vacuum
type is near the border of the type1 and type2 (dual) superconductor.
These results are summarized that the Abelian fundamental charge defined in
an arbitrary color direction is confined inside a hadronic state by the dual
Meissner effect. As the color-neutral state in any Abelian color direction
corresponds to the physical color-singlet state, this effect explains
non-Abelian color confinement and supports the existence of a gauge-invariant
mechanism of color confinement due to the dual Meissner effect caused by
Abelian monopoles.Comment: 11 pages, 14 figure
Robust control of multi-jointed arm with a decentralized autonomous control mechanism
A decentralized autonomous control mechanism applied to the control of three dimensional manipulators and its robustness to partial damage was assessed by computer simulation. Decentralized control structures are believed to be quite robust to time delay between the operator and the target system. A 10-jointed manipulator based on our control mechanism was able to continue its positioning task in three-dimensional space without revision of the control program, even after some of its joints were damaged. These results suggest that this control mechanism can be effectively applied to space telerobots, which are associated with serious time delay between the operator and the target system, and which cannot be easily repaired after being partially damaged
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