Browsing by Author "Ortiz Ulloa, Juvenal Alejandro"

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Biomass yield and carbon abatement potential of banana crops (Musa spp.) in Ecuador
(2021) Ortiz Ulloa, Juvenal Alejandro; Abril González, Mónica Fernanda; Peláez Samaniego, Manuel Raúl; Salamea Piedra, Teresita Silvana
Banana is one of the most important agricultural products of Ecuador. It relies on intensive monoculture cropping systems with a large volume of standing biomass and large amounts of residual biomass that can be used for carbon sequestration. This study was performed (1) to quantify the yearly residual biomass generation, (2) to quantify the carbon stock of standing banana biomass, (3) to estimate the carbon sequestration potential by using the residual biomass generated yearly, and (4) to propose a biomass prediction model for banana crops in Ecuador. The study was conducted between March 2018 and January 2019 in the three main banana-producing provinces of Ecuador (Los Ríos, Guayas, and El Oro). Samples of rachis, pseudostem, leaves, and flowers from 36 banana plants of the variety Musa AAA Cavendish were taken for laboratory tests. Physical measurements such as height, circumferences, number of leaves, and weights were determined for the 36 plants. Results showed an average residue-to-product ratio of 3.79 and a country’s yearly biomass generation of 2.65 Mt on a dry basis. The carbon stock of the standing biomass was estimated as 4.18 ± 1.02 Mg/ha, 5.44 ± 0.96 Mg/ha, and 5.13 ± 1.11 Mg/ha for Los Ríos, Guayas, and El Oro, respectively. The estimated carbon abatement capacity of the residual biomass is 3.92 MtCO_2/year. Three biomass estimation models were developed in Python®, using the data collected in this study and least squares fitting for exponential models of the form: Y = AX^n + C . The models showed good prediction capacity for Ecuadorian banana plants, with R ^2 up to 0.85. It is expected that this study could serve as the basis for studies on developing sustainable conversion processes of banana residual biomass.
Implementación de herramientas Lean Manufacturing en al área de mezclas de la empresa Compañia Ecuatoriana del Caucho S.A.
(2010) Ortiz Ulloa, Juvenal Alejandro; Toledo V., Esteban, asesor; Baquero García, Manuel Orlando
Modelo de pronóstico de ventas de vehículos livianos usando redes neuronales artificiales
(Universidad de Cuenca, 2020-02-27) Morocho Chitacapa, Jenny Fabiola; Ortiz Ulloa, Juvenal Alejandro
Accuracy in sales prediction is vital in any type of industry as it can improve the quality of business strategies or decision making. Specifically, in the automotive industry it plays an increasingly important role due to the growing competition registered in the market, to the long development and production times and to its relationship with the economic variables. This study compares the performance of the classical forecasting methods against artificial neural networks (ANN) when forecasting light vehicle sales of the Neohyundai company, internal and external variables characteristic of the sector are considered. First, a preprocessing step was carried out to ensure the quality of the input data to the ANN, in this stage the normalization and selection of the most influential variables through Lasso regression is included, then Network architecture and learning parameters are established. The results show that ANN exceed traditional prediction methods, this means that the demand for vehicles that are durable consumer goods can be predicted by using different variables. Furthermore, when determining the relative importance of the input variables, it was found that the economic variables contribute significantly to the forecast.
Plan de manejo integral de residuos derivados de la extracción de la pulpa de cacao en la hacienda Bellavista, Luz de América, provincia de Azuay-Ecuador
(2018) Delgado Gutiérrez, Natasha Anabel; Ortiz Ulloa, Juvenal Alejandro
Cocoa seeds are a raw material of great economic importance for the country, however, during the extraction process, waste is generated such as the shell, the placenta and the mucilage that affect the crops as they are a source for the dispersion of diseases and decrease the pH of the soil. The main objective of this study is to design a plan for the integral management of residues derived from the extraction of cocoa pulp. In the first place, the study area and the physical characteristics of the area were established, later through interviews and field visits, the current management of the waste was recorded, the percentage composition of each residue with respect to the total and an estimate of the quantity of waste generated, also a diagnosis of the plantation was made, finally by laboratory analysis the physicochemical properties of the residues were determined. Where, the high moisture content (> 80%), volatile matter (> 76%), and macronutrients especially potassium from the shell and placenta were determined. Several strategic lines were established in the management plan, including collection, storage, valorization, and final disposal of waste, as well as environmental education and staff awareness. As conclusions it is obtained that the most viable alternatives for the valorization of the shell are the vermicomposting and the composting and the exudate and the placenta the production of marmalade.
The role of the industrial engineer in an energy system development
(Editor Universidad de Cuenca, 2018) Ortiz Ulloa, Juvenal Alejandro; Ortiz Ulloa, Juvenal Alejandro
Multiple renewable and more efficient nonrenewable energy systems are studied these days. It is thought that this task only concerns to some specialized fields like chemistry, mechanics, electricity or hydraulics. However, The Industrial Engineering provide a group of skills to add value to any energy related study. An energy system means many interconnected aspects such as: the primary energy source, the conversion process, the desired product and the demand. All of them are variables that must be studied as one system. An Industrial Engineer has unique planning and managing abilities to optimize and manage the resources used in energy projects. This study shows some applications of the Industrial Engineer profile in the developing of a new energy system.
The role of the industrial engineer in an Energy system development
(Universidad de Cuenca, 2017) Ortiz Ulloa, Juvenal Alejandro
Multiple renewable and more efficient nonrenewable energy systems are studied these days. It is thought that this task only concerns to some specialized fields like chemistry, mechanics, electricity or hydraulics. However, The Industrial Engineering provide a group of skills to add value to any energy related study. An energy system means many interconnected aspects such as: the primary energy source, the conversion process, the desired product and the demand. All of them are variables that must be studied as one system. An Industrial Engineer has unique planning and managing abilities to optimize and manage the resources used in energy projects. This study shows some applications of the Industrial Engineer profile in the developing of a new energy system.