Abstract We prepared colloidal ZnSe x S 1− x alloy quantum dots (QDs) and investigated their optical properties. ZnSe x S 1− x QDs were successfully prepared by a hydrothermal method, which was confirmed by the results of X-ray structural analysis. When the alloy composition was decreased from x = 1 to 0, the absorption energy continuously shifted to the high energy side. Band-edge photoluminescence (PL) was the main PL band in ZnSe QDs, whereas only defect - related PL band was observed in ZnS QDs. The band-edge PL was clearly observed as the main PL band for x = 0.52 to 1, which shifted to the high energy side by decreasing x .
Abstract Thermal annealing needs protective gas environment, high pyrolysis temperature and long synthesis period. In this work, Co x Ni y /PNG nanocomposites were prepared by laser induced Co x Ni y ‐MOFs at room temperature and in air environment for the first time. In contrast to Co/PNG and Ni/PNG, Co x Ni y /PNG exhibits enhanced electrocatalytic activity for the oxidation of gallic acid. The optimal sensor presents a broad linear range of 0.7–120 μM (R 2 =0.993, with a sensitivity of 0.031 μA/μM) and a low detection limit of 0.13 μM. Meanwhile, the detection results of gallic acid in actual samples by this sensor are satisfactory. This method is simple and feasible and can provide a new idea and method for the rapid preparation of novel nanocatalysts in room temperature and air.
This paper studies such a problem that the faults recovery are independent and cannot be coordinated quickly in the transmission and distribution dispatching after the fault of the transmission network induces the outage of distribution network. Based on the power flow calculation and coordination information interaction of transmission and distribution, the transmission and coordination fault recovery strategy and the transmission and distribution coordinated power flow checking technology research are carried out. Through the integrated transmission and distribution model, the data of the real-time section of the transmission and distribution network is retrieved, and the coordinative fault recovery strategy is generated online, the coordination of the transmission and distribution network under the large-scale power outage failure are realized and the secondary fault caused by the coordination problem are avoided. The related demonstration application effectively improves the efficiency of the transmission and distribution network dispatchers in handling faults.
Abstract Background & aims Pyogenic liver abscess (PLA) is a common hepatobiliary infection that has been shown to have an increasing incidence, with biliary surgery being identified as a trigger. Our aim was to investigate the clinical characteristics and treatments of PLA patients with and without a history of biliary surgery (BS). Methods The study included a total of 353 patients with PLA who received treatment at our hospital between January 2014 and February 2023. These patients were categorized into two groups: the BS group ( n = 91) and the non-BS group ( n = 262). In the BS group, according to the anastomosis method, they were further divided into bilioenteric anastomoses group (BEA, n = 22) and non-bilioenteric anastomoses group (non-BEA, n = 69). Clinical characteristics were recorded and analyzed. Results The percentage of PLA patients with BS history was 25.78%. The BS group exhibited elevated levels of TBIL and activated APTT abnormalities ( P = 0.009 and P = 0.041, respectively). Within the BS group, the BEA subgroup had a higher prevalence of diabetes mellitus ( P < 0.001) and solitary abscesses ( P = 0.008) compared to the non-BEA subgroup. Escherichia coli was more frequently detected in the BS group, as evidenced by positive pus cultures ( P = 0.021). The BS group exhibited reduced treatment efficacy compared to those non-BS history ( P = 0.020). Intriguingly, the BS group received a higher proportion of conservative treatment (45.05% vs. 21.76%), along with reduced utilization of surgical drainage (6.59% vs. 16.41%). Conclusions Patients with BS history, especially those who have undergone BEA, have an increased susceptibility to PLA formation without affecting prognosis.
A novel low-profile circular cavity-backed slot antenna based on corrugated substrate integrated waveguide (CSIW) operating at 24 GHz is introduced in this paper. By replacing the conventional metallic via-holes in a substrate integrated waveguide (SIW) with quarter-wave open-stubs, CSIW not only preserves some advantages of the SIW technology, but also makes it easier to fabricate and integrate. We design a circular cavity on the basis of CSIW technology and realize the impedance matching by etching two split round slots with the same center on the top of the cavity. In addition, by changing the angle difference between the two splits, a new mode can be crated to widen the impedance bandwidth. Simulation results show the -10 dB impedance bandwidth of the proposed antenna is 6.6% (23.6-25.2 GHz), and the gain patterns are stable in the operating bandwidth and a maximum gain of 5.1 dBi can be achieved in the directions of θ = ±45°.
This paper studied the risk of closed-loop operation specially for a practical AC-DC hybrid smart distribution network, providing main considerations and methods. The perception and control method for the risk of closed-loop operation was proposed, and a simulation calculation tool of closed-loop operation for a 10kV/110kV/ ± 160kV AC-DC distribution network was developed, and a mode for quickly sensing and controlling the operational risks of closed-loop was provided. The actual system closed-loop operation for verification shows that the proposed method can quickly sense and effectively control the risks of closed-loop operation, and improve the reliability and resilience of a complex AC-DC hybrid operation intelligent distribution network.
This study aims to report the hydrothermal synthesis of water-soluble Mn-doped ZnSe-ZnS alloy quantum dots (QDs), wherein manganese (Mn2+) serves as an emission center. The alloy composition was co...
As promising broadband wireless communication technology, applications of TD-LTE in high speed railway (HSR) are of inevitability. Since the radio port of TD-LTE is open, common EMC measures are limited, and consequently radio immunity is the key to TD-LTE in HSR. This work follows the EMC theory, and firstly analyzes major radio EMI in HSR, which is radiated EMI generated by pantograph. According to the characteristics of such EMI, immunity of TD-LTE is quantitatively researched with EESM algorithms. Results show that, although radiated EMI generated by pantograph has enough spaces to TD-LTE signals in frequency domain, the strength of EMI still has to be limited. Otherwise, TD-LTE will be interfered. Moreover this work proposed quantitatively immunity of TD-LTE in HSR, and it is valuable to formulate the EMC standards for TD-LTE equipment in HSR.
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