Combination forecasting model is actually the use of the individual prediction models.How to select the single models in combination forecast is very important.The encompassing test method of combination forecasting models is applied to select single models.The single model group selection method is presented based on encompassing test of combination forecasting models to improve precision of combination forecasting model.The method is mainly to determine whether a single model to be retained in the combined forecasting model according to encompassing test between combined forecasting models of a single forecast method increased with the original combination forecasting model.Finally,the analysis of the application example shows that the predictive accuracy effect of combination forecasting model is improved according to the combined forecasting model encompassing test select single models,so that this method is feasible and effective.
This paper gives three kinds of solutions to Catalan numbers by different models, among which the methods of combination significances and generating functions are the better ones.
Long non‑coding (lnc)RNAs serve a role in a number of diseases, including different types of cancer and acute myocardial infarction. The aim of the present study was to investigate the protective role of lncRNA small nucleolar RNA host gene 8 (SNHG8) in hypoxia‑ischemia‑reoxygenation (HI/R)‑induced myocardial injury and its potential mechanism of action. Cell viability, proliferation, creatine kinase myocardial band, cell apoptosis and protein expression levels were determined by Cell Counting Kit‑8 assay, EdU assay, ELISA, flow cytometry and western blotting, respectively. The association between SNHG8 and microRNA (miR)‑335 was confirmed using a dual‑luciferase reporter gene assay. The effects of the miR‑335 inhibitor transfections had on increasing apoptosis and decreasing H9C2 cell viability were reversed in cells co‑transfected with SNHG8 small interfering (si)RNA. Furthermore, it was found that miR‑335 could regulate RAS p21 protein activator 1 (RASA1) expression and that transfection with SNHG8 siRNA downregulated RASA1 expression. Silencing of RASA1 protected against HI/R‑induced H9C2 cell injury. However, SNHG8 siRNA did not further reduce apoptosis, demonstrating that SNHG8 may act through RASA1, and RASA1 may mediate the protection of SNHG8 siRNA in HI/R myocardial injury. Thus, inhibition of lncRNA SNHG8 alleviated HI/R‑induced myocardial damage by regulating miR‑335 and RASA1.
The influence of 12 nm spherical silver nanoparticles (AgNPs) and 20 nm spherical gold nanoparticles (AuNPs) on the luminescence of europium complex Eu(TTFA)3 were studied. When 350 nm is chosen as the incident light, the maximum enhancement factor of the complexes mixed with AgNPs is about 2.5 at the wavelength of 612 nm. Besides the enhancement of the localized field, the overlap between the localized surface plasmon resonance spectra of nanoparticles and the absorption band of fluorescent molecules is another important factor for excitation field enhancement. By means of the quasi-static approximation theory, the distribution of the electric field around a single spherical metallic nanopaticle illuminated by plane wave was calculated. The simulation results show that the field enhancement effect is more obvious when the incident light is close to the resonance of the metallic nanoparticle, which could be demonstrated by our following experimental results. The distribution of the electric field under the same conditions was also simulated through the COMSOL software. The results are consistent with those of the quasi-static approximation theory.
The effect of multipole resonance in the interaction between a spherical metallic nanoparticle (MNP) and an emitting dipole is studied with the Mie theory. The results show that the absorption peak of the MNP with respect to the field of the emitting dipole is blue-shifted with the decrease of the spacing between MNP and emitting dipole due to the enhanced multipole resonance. At a short distance, the enhanced multipole terms of scattering are not obvious compared with the dipole term. For the decay rate of the emitting dipole, multipole resonance brings about the enhancement of it largely at short spacing. For the radiative decay rate, the behavior is quite different. The dipole term is dominant at a short spacing, and the multipole term is dominant at a larger spacing.
Tm(3+)/Tb(3+)/Eu(3+) tri-doped phosphate glasses are synthesized to explore new white-light-emitting materials. Under 365 nm excitation, the CIE coordinates (x=0.339, y=0.341) of the Eu0.07 glass sample are close to the standard equal energy white-light illumination (x=0.333, y=0.333). The quantum efficiency is very high (~72.27%). The energy transition from Tb(3+) to Eu(3+) is reasonably interpreted based on the analysis of the luminescence lifetimes. To enhance the white-light emission, Tm(3+)/Tb(3+)/Eu(3+) tri-doped phosphate glass ceramics are prepared.
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