3,742 research outputs found
Magnonic band structure of domain wall magnonic crystals
Magnonic crystals are prototype magnetic metamaterials designed for the
control of spin wave propagation. Conventional magnonic crystals are composed
of single domain elements. If magnetization textures, such as domain walls,
vortices and skyrmions, are included in the building blocks of magnonic
crystals, additional degrees of freedom over the control of the magnonic band
structure can be achieved. We theoretically investigate the influence of domain
walls on the spin wave propagation and the corresponding magnonic band
structure. It is found that the rotation of magnetization inside a domain wall
introduces a geometric vector potential for the spin wave excitation. The
corresponding Berry phase has quantized value , where is the
winding number of the domain wall. Due to the topological vector potential, the
magnonic band structure of magnonic crystals with domain walls as comprising
elements differs significantly from an identical magnonic crystal composed of
only magnetic domains. This difference can be utilized to realize dynamic
reconfiguration of magnonic band structure by a sole nucleation or annihilation
of domain walls in magnonic crystals.Comment: 21 pages, 9 figure
RNA interference technology's research progress in the treatment of retinal disease
RNA interference exists widely in animals, which can induce specific genetic sequence to silence by double-stranded RNA molecules at the mRNA level. As a kind of new methods of blocking gene expression, RNA interference technology has become increasingly mature and perfect, it has opened up a new approach of gene therapy. RNA interference can effectively prevent the formation of new vessels in retina, restrain the occurrence and development of the proliferative vitreous retinopathy, and induce apoptosis of retinoblastoma cells. The research progress of the RNA interference in the above retinopathy was summarized in this review
A Multi-mode, Multi-class Dynamic Network Model With Queues For Advanced Transportation Information Systems
In this paper we propose a composite Variational Inequality formulation for modeling multimode, multi-class stochastic dynamic user equilibrium problem in recurrent congestion networks with queues. The modes typically refer to different vehicle types such as passenger cars, trucks, and buses sharing the same road space. Each vehicle type has its own characteristics, such as free flow speed, vehicle size. We extend single mode deterministic point model to multimode deterministic point model for modeling the asymmetric interactions among various modes. Meanwhile, each mode of travelers is classified into two classes. Class 1 is equipped travelers following stochastic dynamic user-equilibrium with less uncertainty of travel cost, class 2 is unequipped travelers following stochastic dynamic user-equilibrium with more uncertainty of travel cost. A solution algorithm based on stochastic dynamic network loading for logit-based simultaneous route and departure time choices is adopted. Finally a numerical example is presented in a simple network
Aquacyanido{6,6′-dimethoxy-2,2′-[1,2-phenylenebis(nitrilomethanylylidene)]diphenolato}cobalt(III) acetonitrile hemisolvate
In the title complex, [Co(C22H18N2O4)(CN)(H2O)]·0.5CH3CN, the CoIII cation is N,N′,O,O′-chelated by a 6,6′-dimethoxy-2,2′-[1,2-phenylenebis(nitrilomethanylylidene)]diphenolate dianion, and is further coordinated by a cyanide anion and a water molecule in the axial sites, completing a distorted octahedral coordination geometry. In the crystal, pairs of bifurcated O—H⋯(O,O) hydrogen bonds link adjacent molecules, forming centrosymmetric dimers. The acetonitrile solvent molecule shows 0.5 occupancy
Structure, Luminescence, and Transport Properties of EuVO_4
Metastable scheelite EuVO_4 was stabilized by a high temperature and pressure method, which was transformed into a stable zircon phase by annealing treatment in air. Scheelite EuVO_4 gave strong emissions with a dominant peak at 617 nm associated with the ^(5)D_0-^(7)F_2 transition of Eu^(3+). ^(151)Eu Mössbauer spectra indicated that the isomer shift for the metastable scheelite phase was ca. 0.5 mm/s lower than that for the zircon phase, which was ascribed to a reduced covalency in the Eu-O bond originated via a charge transfer from oxygen to Eu3+ in scheelite lattice by producing an enhanced shielding of 4f electrons on the s orbital as well as a decrease in s electron density around Eu^(3+) nucleus. Impedance spectra for the zircon phase clearly demonstrated an ionic hopping in the bulk with a conductivity of ca. 1.0×10^(–3) S cm^(–1) at 500°C. EuVO_4 is proved to be both a potential phosphor and a potential ionic conductor
{6,6′-Dimethoxy-2,2′-[(cyclohexane-1,2-diyl)bis(nitriliomethylidyne)]diphenolato}trinitratolanthanum(III) methanol monosolvate
In the title mononuclear complex, [La(NO3)3(C22H26N2O4)]·CH3OH, the LaIII ion is coordinated by three bidentate nitrate counter-ions and one zwitterionic 6,6′-dimethoxy-2,2′-[(cyclohexane-1,2- diyl)bis(nitriliomethylidyne)]diphenolate ligand through two phenolate and two methoxy O atoms, while the protonated N atoms remain uncoordinated. H atoms located on the two N atoms are involved in intramolecular hydrogen bonds with the deprotonated phenol O atoms, indicating that proton migration occurs during the lanthanum complexation
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