10,841 research outputs found
Elaboration and characterization of nanoplate structured alpha-Fe2O3 films by Ag3PO4
A new strategy for surface treatment of hematite nanoplates for efficient photoelectrochemical (PEC) performances is proposed. Silver orthophosphate (Ag₃PO₄) has been adopted to mediate the formation of α-Fe₂O₃ films. Phosphate ions in Ag₃PO₄ is found to cause a significant morphology change during annealing process, from β-FeOOH nanorod arrays to hematite nanoplates. Meanwhile, Ag ions is doped into α-Fe₂O₃ film. The obtained nanoplate structured Fe₂O₃ –Ag–P films demonstrate much higher photoelectrochemical performance as photoanodes than the bare Fe₂O₃ nanorod thin films. The effects of phosphate and silver ions on the morphology, surface characteristics and the PEC properties of the photoanodes are investigated
The Oblique Corrections from Heavy Scalars in Irreducible Representations
The contributions to , , and from heavy scalars in any irreducible
representation of the electroweak gauge group are
obtained. We find that in the case of a heavy scalar doublet there is a slight
difference between the parameter we have obtained and that in previous
works.Comment: 6 pages, 2 axodraw figures; minor changes, references update
Deconfined criticalities and dualities between chiral spin liquid, topological superconductor and charge density wave Chern insulator
We propose bi-critical and tri-critical theories between chiral spin liquid
(CSL), topological superconductor (SC) and charge density wave (CDW) ordered
Chern insulator with Chern number on square, triangular and kagome
lattices. The three CDW order parameters form a manifold of or
depending on whether there is easy-plane anisotropy. The skyrmion defect of the
CDW order carries physical charge and its condensation leads to a
topological superconductor. The CDW-SC transitions are in the same universality
classes as the celebrated deconfined quantum critical points (DQCP) between
Neel order and valence bond solid order on square lattice. Both SC and CDW
order can be accessed from the CSL phase through a continuous phase transition.
At the CSL-SC transition, there is still CDW order fluctuations although CDW is
absent in both sides. We propose three different theories for the CSL-SC
transition (and CSL to easy-plane CDW transition): a theory with two
bosons, a theory with two Dirac fermions, and an theory with two
bosons. Our construction offers a derivation of the duality between these three
theories as well as a promising physical realization. The theory offers
a unified framework for a series of fixed points with explicit or
symmetry. There is also a transparent duality transformation
mapping SC order to easy-plane CDW order. The CSL-SC-CDW tri-critical points
are invariant under this duality mapping and have an enlarged or
symmetry. The DQCPs between CDW and SC inherit the enlarged symmetry, emergent
anomaly, and self-duality from the tri-critical point. Our analysis unifies the
well-studied DQCP between symmetry breaking phases into a larger framework
where they are proximate to a topologically ordered phase.Comment: 30+7 pages, 9 figures, 11 table
Development and construction of China
Libraries in China's higher education institutions have been developing in keeping pace with the flourishing development of China's higher education. This article aims to make an introduction to the construction of China's higher education libraries, especially the recent three decades' achievements since China's reform and opening-up in 1978. In this article, the authors draw a general picture of the development of libraries in China's higher education institutions, covering such eight aspects as management, types and positioning, organizational structure and personnel, expenditure and buildings, reader service, building and sharing of resources as well as automation system.</p
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