Surface Geometric and Electronic Structure of BaFe2As2(001)

BaFe2As2 exhibits properties characteristic of the parent compounds of the newly discovered iron (Fe)-based high-TC superconductors. By combining the real space imaging of scanning tunneling microscopy/spectroscopy (STM/S) with momentum space quantitative Low Energy Electron Diffraction (LEED) we have identified the surface plane of cleaved BaFe2As2 crystals as the As terminated Fe-As layer - the plane where superconductivity occurs. LEED and STM/S data on the BaFe2As2(001) surface indicate an ordered arsenic (As) - terminated metallic surface without reconstruction or lattice distortion. It is surprising that the STM images the different Fe-As orbitals associated with the orthorhombic structure, not the As atoms in the surface plane.Comment: 12 pages, 4 figure

Interaction between Hosts and Guests of Rural Tourism in Northeast China Based on Symbolic Interaction Theory

With constant economic development and continuous improvement of living standards in Northeast China, rural tourism, as a new type of tourism, is increasingly favored. From the perspective of symbolic interaction theory, taking the current situation of rural tourism in Northeast China as an example, this paper explained the semiotic significance between hosts and guests in rural tourism. It established the evaluation indicators for authentic symbolic perception of rural tourism. Also, combined with the theories of sociology and anthropology, it studied the interaction between hosts and tourists of rural tourism in Northeast China

Comprehensive Evaluation of Circular Economic Development in North Anhui Province

In view of the characteristics of north Anhui Province, an index system was constructed for evaluating the development level of circular economy according to relevant principles, Principal Component Analysis and Analytic Hierarchy Process were adopted to evaluate the circular economic development in north Anhui Province, and corresponding measures were put forward to promote the circular economy in north Anhui Province

Simultaneous Removal of Trivalent Arsenic and Nitrate Using Microbial Fuel Cells

A rectangular double chamber with trivalent arsenic as the electron donor of the biological anode was constructed by microbial fuel cells (MFC), and the feasibility of the MFC simultaneous degradation of trivalent arsenic and nitrate was studied. Experimental results show that the co-matrix-coupled MFC reactor oxidizes trivalent arsenic in an anode chamber and degrades nitrate in the cathode chamber. The removal rate of trivalent arsenic is about 63.35%, and the degradation rate of nitrate is about 55.95% during the complete and stable operation period. MFC can continuously output electric energy, and the maximum output voltage is 388 mV. We compared and analyzed the main functional microflora of biofilm microorganisms in an anode chamber. In the long-term arsenic-polluted environment, the activity of Acinetobacter, Pseudomonas bacteria with arsenic resistance, was improved. It is inferred that a fraction of trivalent arsenic was oxidized to pentavalent arsenic by electrode-attached microorganisms. While remaining trivalent, arsenic was taken up by the suspended bacterial biomass and converted into stable arsenide. The results of this study have theoretical reference value for the expansion of the MFC application scope

Causes of diverse impacts of ENSO on the Southeast Asian summer monsoon among CMIP6 models

This study examines the fidelity of 47 models from phase 6 of the Coupled Model Intercomparison Project (CMIP6) in representing the influence of El Niño–Southern Oscillation (ENSO) on the Southeast Asian summer monsoon (SEASM) during the ENSO decaying summer. The response of the SEASM to ENSO shows a large model spread among the models, some of which even simulate opposite signs of SEASM anomalies compared to the observed values. The bad-performance models (BPMs) are therefore selected to be compared with both the good-performance models (GPMs) and observations to explore the possible causes of the deficiency. Results show that in the BPMs, the ENSO-related warm sea surface temperature (SST) anomalies extend too far westward in the western equatorial Pacific (WEP) and they do not dissipate in the El Niño decaying summer in comparison with those in the GPMs and observations, interfering with the effect of ENSO on the SEASM. The slow decay of WEP SST anomalies from the El Niño mature winter to the decaying summer in BPMs is mainly caused by a weak negative shortwave radiation feedback due to a low sensitivity of convection to local SST anomalies, which is related to the cold bias in climatological SST over this region. On the other hand, from the mature winter to the decaying summer of El Niño, the El Niño-related anomalous eastward current does not reverse to westward current in the BPMs, which also contributes to the slow decay of WEP SST anomalies via inducing excessively persistent warm zonal advection

Comprehensive Evaluation of Circular Economic Development in North Anhui Province

In view of the characteristics of north Anhui Province, an index system was constructed for evaluating the development level of circular economy according to relevant principles, Principal Component Analysis and Analytic Hierarchy Process were adopted to evaluate the circular economic development in north Anhui Province, and corresponding measures were put forward to promote the circular economy in north Anhui Province.Circular economy, Evaluation system, Principal Component Analysis (PCA), Analytic Hierarchy Process (AHP), North Anhui Province, Community/Rural/Urban Development, Research Methods/ Statistical Methods,