Fabrication of pollution-free coal gangue-based catalytic material utilizing ferrous chloride as activator for efficient peroxymonosulfate activation

Novel coal gangue-based persulfate catalyst(CG-FeCl_(2))was successfully synthesized by the means of calcinating under nitrogen atmosphere with the addition of ferrous chloride tetrahydrate(FeCl_(2)·_(4)H_(2)O).The phase transformation of the prepared materials and gas products during the heating process are thoroughly investigated.It is suggested that ferrous chloride participated in the phase transformation and formed Si-O-Fe bonds.And the main gaseous products are H_(2)O,H_(2),and HCl during the heating process.Besides,the ability of CG-FeCl_(2) to activate peroxymonosulfate(PMS)for catalytic degradation of polycyclic aromatic hydrocarbons(PAHs)and phenol was deeply studied.More than 95%of naphthyl,phenanthrene and phenol were removed under optimizied conditions.In addition,1O_(2),·OH,and SO_(4)·−were involved in the CG-FeCl_(2)/PMS system from the free radical scavenging experiment,where 1O_(2) played a major role during the oxidation process.Furthermore,CG-FeCl_(2)/PMS system exhibited superior stability in a relatively wide pH range and the presence of common anion from related degradation experiments.Overall,the novel CG-FeCl_(2) is an efficient and environmentally friendly catalyst,displaying potential application prospect in the field of PAHs and phenol-contaminated wastewater treatment.

Research on Indoor Positioning Technology of WSN based on T-RL Partition Path Model

To address the issues of unstable received signal strength indicator(RSSI)and low indoor positioning accuracy caused by walls and obstacles,the propagation conditions of the wireless communication system are categorized into two distinct environments:line-of-sight(LOS)and non-line-of-sight(NLOS).In the LOS environment,the traditional logarithmic path loss model is applied.For the NLOS environment,the impact of walls on signal transmission is considered,leading to the development of a multi-wall path loss model based on the T-RL method,with improvements made to the key parameter,the Fresnel coefficient R.The breakpoint value d=2.3 m in the partitioned model is determined,and the positional coordinates of the unknown nodes are calculated using the trilateration algorithm.Experimental results indicate that the T-RL based multi-wall model improves localization accuracy by 47%in NLOS environments compared to the traditional logarithmic path loss model.The average localization error using the T-RL partitioned path loss model is 0.7021 m,representing a 55.9%improvement over the logarithmic path loss model and a 16.8%enhancement over the T-RL attenuation multi-wall model,thereby providing better environmental adaptability.

Correction to:Arduino-based low-cost electrical load tracking system with a long-range mesh network

Correction to:Adv.Manuf.https://doi.org/10.1007/s40436-020-00310-5 In the original publication the first author name is published incorrectly as "Xin-Lin Wang".The correct author name should be read as "Xinlin Wang".Also,the correct fund note in the acknowledgement section should be "This research was supported in part by the International S&T Cooperation Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science,ICT&Future Planning(MSIP)(Grant No.NRF-2017K1A3A9A04013801),and by the Basic Research Lab Program through NRF funded by the MSIT(Grant No.2018R1A4A1059976)".The correct author name and correct fund note is available in this correction.

Emerging trends in early-onset gastric cancer

The incidence of early-onset gastric cancer(EOGC)is consistently increasing,and its etiology is notably complex.This increase may be attributed to distinctive factors that differ from those associated with late-onset gastric cancer(LOGC),including genetic predispositions,dietary factors,gastric microbiota dysbiosis,and screening of high-risk cases.These factors collectively contribute to the onset of cancer.EOGC significantly differs from LOGC in terms of clinicopathological and molecular characteristics.Moreover,multiple differences in prognosis and clinical management also exist.This study aimed to systematically review the latest research advancements in the epidemiological characteristics,etiological factors,clinicopathological and molecular features,prognosis,and treatment modalities of EOGC.