Sobre la síntesis óptima de mecanismos

Abstract

In the engineering design process, it is of particular relevance the problem statement that has to be solved to guarantee an optimal design. There is no general rule for this, and in the particular case of the synthesis of flat mechanisms, the solution strongly depends on the problem statement for the design or mechanism synthesis. The object this paper is presenting one proposal at synthesis problem of a four-bar flat mechanism for cartesian trajectory tracking. The mechanism synthesis problem is stated as a nonlinear optimization problem with non linear constraints. Four different approaches are considered in order to demonstrate the impact of the considered statement of the optimization problem for its solution. The solution of the four optimization problems is obtained by means of numerical calculations using genetic algorithms. The numerical results of the four optimization problem statemens are compared under fair circumstances and they depict the great influence of the initial problem statement for its solution.

Caracterización fisicoquímica y compuestos bioactivos en los frutos de pitaya (Stenocereus thurberi) de cuatro colores

“…González, García-Mateos, Corrales-García & Colinas-León, 2018), dentro de éste género se encuentran 24 especies, de las cuales 21 son endémicas de México (Gibson & Horak, 1978). S. stellatus, S. queretaroensis, S. griseus y S. pruinosus son especies utilizadas en las plantaciones agrícolas comerciales (Santacruz Vázquez, Santacruz Vázquez & Huerta Espinosa, 2009); en este estudio la especie de interés S. thurberi variedad thurberi, conocido como "pitaya dulce" es un fruto silvestre recolectado y comercializado en los mercados locales (Bravo-Hollis, 1991) de la región de San José del Llano, Badiraguato, Sinaloa.…”

Physico-chemical characteristics, and bioactive compounds of red fruits of sweet pitaya (Stenocereus thurberi)

“…In Mexico there are 21 species of this genus, of which S. stellatus, S. queretaroensis, S. griseus, and S. pruinosus are currently produced in commercial plantations and family orchards; while S. thurberi var. thurberi or sweet pitaya, continues to be collected from wild communities and marketed in local markets (Pimienta-Barrios, 1999;Santacruz-Vázquez et al, 2009;Chuck-Hernández et al, 2016). The fruits of the different varieties are named on the basis of flesh color which can be red, purple, JPACD (2019) 21:87-100 88 yellow, pink, orange or white (Santacruz-Vázquez et al, 2009;Campos-Rojas et al, 2011;Chuck-Hernández et al, 2016).…”

“…thurberi or sweet pitaya, continues to be collected from wild communities and marketed in local markets (Pimienta-Barrios, 1999;Santacruz-Vázquez et al, 2009;Chuck-Hernández et al, 2016). The fruits of the different varieties are named on the basis of flesh color which can be red, purple, JPACD (2019) 21:87-100 88 yellow, pink, orange or white (Santacruz-Vázquez et al, 2009;Campos-Rojas et al, 2011;Chuck-Hernández et al, 2016).…”