Radial Basis Function Neural Network Based on an Improved Exponential Decreasing Inertia Weight-Particle Swarm Optimization Algorithm for AQI Prediction

This paper proposed a novel radial basis function (RBF) neural network model optimized by exponential decreasing inertia weight particle swarm optimization (EDIW-PSO). Based on the inertia weight decreasing strategy, we propose a new Exponential Decreasing Inertia Weight (EDIW) to improve the PSO algorithm. We use the modified EDIW-PSO algorithm to determine the centers, widths, and connection weights of RBF neural network. To assess the performance of the proposed EDIW-PSO-RBF model, we choose the daily air quality index (AQI) of Xi’an for prediction and obtain improved results

The Studies of Irradiation Hardening of Stainless Steel Reactor Internals under Proton and Xenon Irradiation

Specimens of stainless steel reactor internals were irradiated with 240 keV protons and 6 MeV Xe ions at room temperature. Nanoindentation constant stiffness measurement tests were carried out to study the hardness variations. An irradiation hardening effect was observed in proton- and Xe-irradiated specimens and more irradiation damage causes a larger hardness increment. The Nix-Gao model was used to extract the bulk-equivalent hardness of irradiation-damaged region and critical indentation depth. A different hardening level under H and Xe irradiation was obtained and the discrepancies of displacement damage rate and ion species may be the probable reasons. It was observed that the hardness of Xe-irradiated specimens saturate at about 2 displacement/atom (dpa), whereas in the case of proton irradiation, the saturation hardness may be more than 7 dpa. This discrepancy may be due to the different damage distributions

Facile fabrication of a novel microporous Schiff-base networks polymer membrane on surface modified porous alpha-Al2O3 support

A surface modification strategy was applied by using 3-aminopropyltriethoxysilane (APTES) covalent linkage between the Schiff-base networks (SNW) polymer layers and porous alpha-Al2O3 ceramic support. The SNW-1 polymer membrane and powders resulting from the polycondensation reaction between melamine and terephthalaldehyde without the polycondensation catalysts were investigated by SEM and FT-IR. The results show that the discrete and few covered polymer layers were formed on the unmodified porous alpha-Al2O3 support. In contrast, the uniform and compact SNW-1 polymer membrane was fabricated successfully on the APTES modified alpha-Al2O3 support by in-situ catalyst-free polycondensation method, indicating that the APTES surface modification facilitates the growth of the novel SNW-1 polymer membrane on the porous a-Al2O3 support. (C) 2014 Elsevier B.V. All rights reserved

Potential Factors for Psychological Symptoms at Three Months in Patients with Young Ischemic Stroke

Objective. Psychological status plays a vital role in the recovery in young ischemic stroke patients. However, few reports on the psychological symptoms in Chinese young ischemic stroke patients have been published. In the present study, we aimed to outline the psychological status of young ischemic stroke patients and its risk factors at three months after their stroke. Methods. 364 patients with young ischemic stroke and 384 age-matched healthy controls were consecutively recruited from our study hospitals of the mainland of China between June 2018 and November 2020. Social demographic and clinical data were collected from all enrolled participants in the acute stage of their stroke, and their psychological variables were assessed via the Symptom Checklist 90 Revised (SCL-90-R) at three-month timepoint after their stroke. Multivariable logistic regression analyses were run to identify the independent factors for psychological variables in patients. Results. Compared with healthy controls, patients with young ischemic stroke had significantly higher total score of SCL-90-R and all subscale total scores (p<0.01 or 0.05). 22.3% (81/364 cases) in young ischemic stroke patients had psychological abnormalities. Compared with young ischemic stroke patients without psychological symptoms (n=283), patients with psychological symptoms (n=81) had higher rate of married status (p=0.03), rate of hypertension (p=0.01), infarct size (p=0.01), and the family dysfunction (p<0.01). Multivariate logistic regression analyses revealed that the family dysfunction (odds ratio [OR], 2.50, 95% confidence interval [CI]: 1.71 to 3.54, p<0.01), having hypertension (OR, 3.27, 95% CI: 1.92 to 4.27, p=0.02), and ≥20mm3 infarct size (OR, 2.39, 95% CI: 1.53 to 3.45, p<0.01) were independent factors for having psychological abnormalities in patients with young ischemic stroke at three months after their stroke. Single (OR, 1.23, 95% CI: 1.03 to 1.54, p=0.01), poor family function (OR, 1.21, 95% CI: 1.05 to 1.45, p=0.03), and ≥20mm3 infarct size (OR, 1.74, 95% CI: 1.14 to 3.13, p=0.02) were independent factors for having depression in patents with psychological symptoms. The family dysfunction (OR, 2.32, 95% CI: 1.51 to 2.80, p<0.01) and hypertension (OR, 2.41, 95% CI: 1.54 to 3.46, p=0.03) were independent factors for emerging somatization and anxiety in patients with psychological symptoms, respectively. Conclusions. At three months after their stroke, young ischemic stroke patients had psychological problems and risk factors for developing them