4,106 research outputs found
Distributivity between extended nullnorms and uninorms on fuzzy truth values
This paper mainly investigates the distributive laws between extended
nullnorms and uninorms on fuzzy truth values under the condition that the
nullnorm is conditionally distributive over the uninorm. It presents the
distributive laws between the extended nullnorm and t-conorm, and the left and
right distributive laws between the extended generalization nullnorm and
uninorm, where a generalization nullnorm is an operator from the class of
aggregation operators with absorbing element that generalizes a nullnorm.Comment: 2
Poly[diaqua-μ2-oxalato-di-μ4-succinato-diyttrium(III)]
In the title compound, [Y2(C4H4O4)2(C2O4)(H2O)2]n, the flexible succinate anion assumes a gauche conformation and bridges the eight-coordinated Y atoms, generating two-dimensional layers parallel to (010). The coordination polymer layers are linked into a three-dimensional framework by the rigid oxalate ligands. The oxalate ions are located on a center of inversion. InterÂmolecular O—H⋯O hydrogen bonds help to stabilize the crystal structure
VLBI astrometry of two millisecond pulsars
We present astrometric results on two millisecond pulsars, PSR B1257+12 and
PSR J1022+1001, as carried out through VLBI. For PSR B1257+12, a
model-independent distance of pc and proper motion of
( mas/yr,
mas/yr) were obtained from 5 epochs of VLBA and 4 epochs of EVN observations,
spanning about 2 years. The two dimensional proper motion of PSR J1022+1001
( mas/yr, mas/yr) was
also estimated, using 3 epochs of EVN observations. Based on our results, the
X-ray efficiency of PSR B1257+12 should be in the same range as other
millisecond pulsars, and not as low as previously thought.Comment: Proceedings of IAUS 291 "Neutron Stars and Pulsars: Challenges and
Opportunities after 80 years", J. van Leeuwen (ed.); 3 page
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