Hybrid Approaches-Based Sliding-Mode Control for pH Process Control.

This paper presents two hybrid control topologies; the topologies are designed by combining artificial intelligence approaches and sliding-mode control methodology. The first topology mixes the learning algorithm for multivariable data analysis (LAMDA) approach with sliding-mode control. The second offers a Takagi-Sugeno multimodel approach, internal model, and sliding-mode control.

Modeling oil price uncertainty effects on economic growth in Mexico: a sector-level analysis.

This paper analyzes the impact of international oil price uncertainty on the different economic sectors (primary, secondary, and tertiary) in Mexico in the period 1993:1-2020:4 through a bivariate structural vector autoregressive (VAR) model with a generalized autoregressive conditional heteroskedasticity (GARCH) in mean to capture the impact of oil volatility on economic growth at the sectoral level of economic activity. The results show that the uncertainty of the international price of oil has a differentiated effect on the different sectors of economic activity in Mexico since it does not influence the primary sector; it negatively impacts the secondary sector, and there is mixed evidence in the tertiary sector. Additionally, evidence is provided that both positive and negative shocks to the international oil price have asymmetric effects at the sectoral level in Mexico.

Obesity, ostearthritis and clinical treatment.

Objective: To evaluate the relationship between BMI and pain and function in patients with OA undergoing medical treatment following OARSI recommendations.

Methods: Thirty-eight patients were classified according to their arthritis degree by X-ray and body mass index (BMI). All patients completed the WOMAC, Lequesne, and visual analogue pain scale (VAS) questionnaires at baseline and after six months treatment.