10 research outputs found
Realization of Qi-Wu-Zhang model in spin-orbit-coupled ultracold fermions
Based on the optical Raman lattice technique, we experimentally realize the
Qi-Wu-Zhang model for quantum anomalous Hall phase in ultracold fermions with
two-dimensional (2D) spin-orbit (SO) coupling. We develop a novel protocol of
pump-probe quench measurement to probe, with minimal heating, the resonant spin
flipping on particular quasi-momentum subspace called band-inversion surfaces.
With this protocol we demonstrate the first Dirac-type 2D SO coupling in a
fermionic system, and detect non-trivial band topology by observing the change
of band-inversion surfaces as the two-photon detuning varies. The non-trivial
band topology is also observed by slowly loading the atoms into optical Raman
lattices and measuring the spin textures. Our results show solid evidence for
the realization of the minimal SO-coupled quantum anomalous Hall model, which
can provide a feasible platform to investigate novel topological physics
including the correlation effects with SO-coupled ultracold fermions.Comment: 7 pages, 4 figures in the main text, and 6 pages, 3 figures in the
supplemental materia
A giant orbital solitary fibrous tumor treated by surgical excision: a case report and literature review
Abstract Background Spindle cell tumors, called solitary fibrous tumors (SFTs), are of mesenchymal origin, and can develop in the orbit. As ‘intermediate malignancy’ tumors, only a small percentage show malignant behavior, such as invasion of surrounding tissue. Case presentation A 57-year-old woman presented with a 19-year history of a giant right orbital mass. Orbital computed tomography (CT) revealed an inhomogeneously-enhancing mass compressing and engulfing the eyeball and optic nerve. She underwent lid-sparing orbital exenteration. Microscopic characteristics and immunohistochemistry (IHC) tests were indicative of a benign SFT. No recurrence was observed at the 4-year follow-up. Conclusion Early and complete tumor resection is recommended
Effect of Vibration Procedure on Particle Distribution of Cement Paste
Vibration procedures significantly affect the performances of cement-based materials. However, studies on the distribution of certain particles within cement-based materials are limited due to the complexity and difficulty of identifying each specific particle. This paper presents a new method for simulating and quantifying the movements of particles within cement paste through the use of “tagged materials”. By separating the tagged particles from the cement paste after vibration, the distribution of the particles in the cement paste can be calculated statistically. The effect of the vibration time and frequency, fresh behavior, and powder characteristics of cement paste on particle motions are investigated. The results demonstrate that when the vibration exceeds 1800 s, it induces a significant uneven dispersion of microparticles. This effect is more pronounced at low viscosities (200 Hz). Larger and denser particles exhibit greater dispersion. This method provides a valuable tool for investigating the theory of particle motion in cement paste, which is crucial for understanding the influence of vibration on the properties of cement-based materials
The presence of Chlamydia phage PhiCPG1 capsid protein VP1 genes and antibodies in patients infected with Chlamydia trachomatis
Chlamydia phage PhiCPG1 has been found in Chlamydia caviae in a guinea pig model for inclusion conjunctivitis, raising the possibility that Chlamydia phage is also present in patients infected with C. trachomatis (Ct). In the present study, we assayed for presence of Chlamydia phage capsid protein VP1 genes and antibodies in 84 non-Ct controls and 206 Ct patients using an enzyme-linked immunoassay (ELISA), followed by verification with Western blot. None of the subjects were exposed to an antibiotic treatment or had a C. pneumoniae infection. The VP1 antibody test was positive in both, the ELISA and Western blot assay, in 4 Ct patients. PCR amplification experiments revealed presence of the VP1 gene in 5 Ct patients. The results suggest that Chlamydia phage capsid protein VP1 may exist in some Ct patients
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Insights into the Mechanism of Methanol Steam Reforming Tandem Reaction over CeO2 Supported Single-Site Catalysts.
We demonstrated how the special synergy between a noble metal single site and neighboring oxygen vacancies provides an "ensemble reaction pool" for high hydrogen generation efficiency and carbon dioxide (CO2) selectivity of a tandem reaction: methanol steam reforming. Specifically, the hydrogen generation rate over single site Ru1/CeO2 catalyst is up to 9360 mol H2 per mol Ru per hour (579 mLH2 gRu-1 s-1) with 99.5% CO2 selectivity. Reaction mechanism study showed that the integration of metal single site and O vacancies facilitated the tandem reaction, which consisted of methanol dehydrogenation, water dissociation, and the subsequent water gas shift (WGS) reaction. In addition, the strength of CO adsorption and the reaction activation energy difference between methanol dehydrogenation and WGS reaction play an important role in determining the activity and CO2 selectivity. Our study paves the way for the further rational design of single site catalysts at the atomic scale. Furthermore, the development of such highly efficient and selective hydrogen evolution systems promises to deliver highly desirable economic and ecological benefits