387 research outputs found
4,4′-(Ethene-1,2-diyl)dipyridinium bis[4-(2-carboxybenzoyl)benzoate]
In the crystal structure of the title compound, C12H12N2
2+·2C15H9O5
−, the cation has site symmetry with the mid-point of C=C bond located on an inversion center. The two benzene rings of the anion are oriented at a dihedral angle 85.87 (6)°. In the crystal, intermolecular O—H⋯O and N—H⋯O hydrogen bonds link the cations and anions into supramolecular double chains, which are further connected into a three-dimensional network through intermolecular C—H⋯O and π–π stacking between parallel pyridine rings [centroid–centroid distance = 3.4413 (12)Å] and between parallel benzene rings [centroid–centroid distance = 3.6116 (14)Å]
Residue theorem and summing over Kaluza-Klein excitations
Applying the equations of motion together with corresponding boundary
conditions of bulk profiles at infrared and ultraviolet branes, we verify some
lemmas on the eigenvalues of Kaluze-Klein modes in framework of warped extra
dimension with the custodial symmetry . Using the lemmas and performing properly
analytic extensions of bulk profiles, we present the sufficient condition for a
convergent series of Kaluze-Klein excitations and sum over the series through
the residue theorem. The method can also be applied to sum over the infinite
series of Kaluze-Klein excitations in unified extra dimension. Additional, we
analyze the possible connection between the propagators in five dimensional
full theory and the product of bulk profiles with corresponding propagators of
exciting Kaluze-Klein modes in four dimensional effective theory, and recover
some relations presented in literature for warped and unified extra dimensions
respectively. As an example, we demonstrate that the corrections from neutral
Higgs to the Wilson coefficients of relevant operators for contain the suppression factor comparing
with that from other sectors, thus can be neglected safely.Comment: 44 pages, no figur
Aqua(2,2′-bipyrimidine-κ2 N,N′)(succinato-κ2 O 1,O 4)copper(II) dihydrate
In the crystal structure of the title compound, [Cu(C4H4O4)(C8H6N4)(H2O)]·2H2O, the CuII atom is chelated by a 2,2′-bipyrimidine (bpm) ligand and a succinate anion in the basal plane; a water molecule in the apical position completes the slightly distorted square-pyramidal coordination geometry. Another carboxylate O atom from an adjacent complex is located in the opposite apical direction, with a Cu⋯O distance of 2.706 (3) Å, and is not considered as a bridging atom. Extensive O—H⋯O and O—H⋯N hydrogen bonding is present in the crystal structure
Aquabis(2-amino-1,3-thiazole-4-acetato-κ2 O,N 3)nickel(II)
In the crystal structure of the title compound, [Ni(C5H5N2O2S)2(H2O)], the NiII cation is located on a twofold rotation axis and chelated by two 2-amino-1,3-thiazole-4-acetate (ata) anions in the basal coordination plane; a water molecule located on the same twofold rotation axis completes the distorted square-pyramidal coordination geometry. Intermolecular O—H⋯O and N—H⋯O hydrogen bonding, as well as π–π stacking between parallel thiazole rings [centroid–centroid distance 3.531 (8) Å], helps to stabilize the crystal structure
Scalar products of the open XYZ chain with non-diagonal boundary terms
With the help of the F-basis provided by the Drinfeld twist or factorizing
F-matrix of the eight-vertex solid-on-solid (SOS) model, we obtain the
determinant representations of the scalar products of Bethe states for the open
XYZ chain with non-diagonal boundary terms. By taking the on shell limit, we
obtain the determinant representations (or Gaudin formula) of the norms of the
Bethe states.Comment: Latex file, 28 page
Valley Isospin Controlled Fractional Quantum Hall States in Bilayer Graphene
A two-dimensional electron system placed in a magnetic field develops Landau
levels, where strong Coulomb interactions lead to the appearance of many-body
correlated ground states. Quantum numbers similar to the electron spin enable
the understanding and control of complex ground state order and collective
excitations. Owing to its spin, valley and orbital degrees of freedom,
Bernal-stacked bilayer graphene offers a rich platform to pursue correlated
phenomena in two dimensions. In this work, we fabricate dual-gated
Bernal-stacked bilayer graphene devices and demonstrate unprecedented fine
control over its valley isospin degrees of freedom using a perpendicular
electric field. Higher sample quality enables us to probe regimes obscured by
disorder in previous studies. We present evidence for a new even-denominator
fractional quantum Hall state at filling factor {\nu} = 5/2. The 5/2 state is
found to be spontaneously valley polarized in the limit of vanishing valley
Zeeman splitting, consistent with a theoretical prediction made regarding the
spin polarization of the Moore-Read state. In the vicinity of the
even-denominator fractional quantum Hall states, we observe the appearance of
the predicted Levin-Halperin daughter states of the Moore-Read Pfaffian wave
function at {\nu}= 3/2, 7/2 and of the anti-Pfaffian at {\nu}= 5/2 and -1/2.
These observations suggest the breaking of particle-hole symmetry in bilayer
graphene. We construct a comprehensive valley polarization phase diagram for
the Jain sequence fractional states surrounding filling factor 3/2. These
results are well explained by a two-component composite fermion model, further
demonstrating the SU(2) nature of the valley isospin in bilayer graphene. Our
experiment paves the path for future efforts of manipulating the valley isospin
in bilayer graphene to engineer exotic topological orders and quantum
information processes.Comment: 24 pages, 14 figure
Free field realization of the exceptional current superalgebra \hat{D(2,1;\a)}_k
The free-field representations of the D(2,1;\a) current superalgebra and
the corresponding energy-momentum tensor are constructed. The related screening
currents of the first kind are also presented.Comment: Latex file, 10 page
A Novel Domperidone Hydrogel: Preparation, Characterization, Pharmacokinetic, and Pharmacodynamic Properties
The purpose of the present study was to prepare a novel domperidone hydrogel. The domperidone dispersion was prepared by the solvent evaporation method. The characteristics of domperidone dispersion were measured by dynamic light scattering (DLS), scanning electronic microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffractometry, and solubility test, respectively. Domperidone hydrogel was prepared by directly incorporating the domperidone dispersion in Carbopol hydrogel to increase its mucoadhesive properties to gastrointestinal tract (GIT). The in vivo pharmacokinetic and pharmacodynamic studies were investigated to evaluate the relative oral bioavailability and the propulsion efficacy of domperidone hydrogel as compared with market domperidone tablet (Motilium tablet). The particle size of domperidone dispersion in distilled water was 454.0 nm. The results of DSC and X-ray indicated that domperidone in dispersion was in amorphous state. The solubility of domperidone in the dispersion in distilled water, pH of 1, 5, and 7 buffer solution was 45.7-, 63.9-, 13.1-, and 3.7-fold higher than that of raw domperidone, respectively. The area under the plasma concentration curve (AUC0–24) in domperidone hydrogel was 2.2-fold higher than that of tablet. The prolonged propulsion efficacy in the domperidone hydrogel group compared to that in tablet group was observed in the pharmacodynamic test
Visualizing the elongated vortices in -Ga nanostrips
We study the magnetic response of superconducting -Ga via low
temperature scanning tunneling microscopy and spectroscopy. The magnetic vortex
cores rely substantially on the Ga geometry, and exhibit an unexpectedly-large
axial elongation with aspect ratio up to 40 in rectangular Ga nano-strips
(width 100 nm). This is in stark contrast with the isotropic circular
vortex core in a larger round-shaped Ga island. We suggest that the unusual
elongated vortices in Ga nanostrips originate from geometric confinement effect
probably via the strong repulsive interaction between the vortices and Meissner
screening currents at the sample edge. Our finding provides novel conceptual
insights into the geometrical confinement effect on magnetic vortices and forms
the basis for the technological applications of superconductors.Comment: published in Phys. Rev. B as a Rapid Communicatio
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