Héctor Hernández

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The cacti family is a morphologically heterogeneous group comprising 100 genera and about 1500 species (Hernandez and Barcenas, 1996). With the exception of one genus, all members of this family are native to America (Hernandez and Barcenas, 1996). There are three subfamilies, Opuntioideae, Cactoideae, and Pereskioideae (Gibson and Nobel, 1986). DNA(More)
The city of Salamanca in central Mexico is surrounded by heavy industry, i.e., a refinery, a thermoelectric plant and chemical industries. Variable concentrations of vanadium (V) have been reported in the groundwater, and their presence has been related to particulates so this hypothesis was tested by sampling soil in the urban area and the surrounding(More)
Recently, on the assumption that the presence of the recycle stream in thermally coupled distillation schemes (TCDS) might origin a difficult operation, some alternate arrangements that might provide better operational properties have been proposed. In this work, on the framework of singular value analysis, control properties of two alternate schemes were(More)
Objectives: To determine the impact of surgery in mortality and morbidity in patients with severe acute pancreatitis (SAP) and intra-abdominal hypertension (IAH) or low abdominal perfusion pressure (APP). Materials and methods: We performed a case-control study of adult patients who presented with SAP and IAH or low APP defined as APP < 60 mmHg at the(More)
In this paper, design and optimization procedures are developed for a conventional extractive distillation sequence and a thermally coupled extractive distillation scheme. The proposed methodologies detect the optimal values of the design variables in order to guarantee the minimum energy consumption. It was found that the optimum energy consumption can be(More)
This article describes a computer system to support decisions in Intensive Medicine developed for a multipurpose Intensive Care Unit (13 beds and about 700 yearly patients). The system is used in a microcomputer (486DX4). Works done in this area are mentioned; and the different programs which integrate the system, the advantages of its use and the results(More)
Design and Control of New Intensified Distillation Systems for Quaternary Separations using Genetic Algorithms José Antonio Vázquez – Castillo, Josué Addiel Venegas – Sánchez, Juan Gabriel Segovia – Hernández, Salvador Hernández, Héctor Hernández, Claudia Gutiérrez – Antonio and Abel Briones Ramírez Universidad de Guanajuato, Departamento de Ingeniería(More)
An important problem in the bioethanol production process is the purification of ethanol from a dilute solution, i.e., approximately 10% ethanol in water. The key factor in the purification process is the formation of the ethanol-water binary homogeneous azeotrope, and an additional process is required to obtain high purity ethanol that can be used in motor(More)
Foreword In mid 1997, the European Industrial Advisory Group overseeing European participation in the IMS initiative (i.e. an international R&D collaborative scheme on Intelligent Manufacturing Systems), requested a synthetic overview of the competitive and technological Strengths and Weaknesses of manufacturing industry in Europe, as well as the emerging(More)
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