Alexander Alfonso Álvarez

ORCID: 0000-0001-5129-7164
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About
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Research Areas
  • Natural Fiber Reinforced Composites
  • Quality and Safety in Healthcare
  • Underwater Vehicles and Communication Systems
  • Tribology and Wear Analysis
  • Multidisciplinary Research Papers Compilation
  • Material Selection and Properties
  • Business, Innovation, and Economy
  • Thermochemical Biomass Conversion Processes
  • Maritime Navigation and Safety
  • Quality and Supply Management
  • Structural Analysis and Optimization
  • Advanced Photocatalysis Techniques
  • Additive Manufacturing and 3D Printing Technologies
  • Ship Hydrodynamics and Maneuverability
  • Coal and Its By-products
  • Innovations in Concrete and Construction Materials
  • Adsorption and biosorption for pollutant removal
  • Diverse Applied Research Studies
  • TiO2 Photocatalysis and Solar Cells
  • Electrospun Nanofibers in Biomedical Applications
  • Statistical Methods and Applications
  • Materials Engineering and Processing
  • Vehicle emissions and performance
  • Multidisciplinary Science and Engineering Research
  • Fluid Dynamics Simulations and Interactions

University of La Serena
2019-2024

Universidade de São Paulo
2017-2018

Universidade Brasil
2017

A characterization of composite materials a polyester matrix reinforced with natural fibers Cuban henequen and organophilized bentonite was carried out, the experimental results which are used to formulate, implement, validate scalar damage model. The were added on weight basis 15, 20, 25% as reinforcing material, bentonite, in amounts 3, 5, 7% by weight, added. Samples containing only polymer showed best mechanical performance for fiber, increases 51% tensile strength 169% impact...

10.3390/app13042677 article EN cc-by Applied Sciences 2023-02-19

Currently, the cultivation and harvesting of mollusks is a crucial activity worldwide. However, this industry generates large amount mollusk shell waste disposed in landfills, causing environmental pollution. In addition, companies linked to item allocate sums money depositing shells authorized landfills. South America, Chile one leading producers worldwide scallop (Argopecten purpuratus) waste, creating growing financial problem country, especially considering that there has yet be progress...

10.3390/app14083499 article EN cc-by Applied Sciences 2024-04-21

The structure of an autonomous underwater vehicle (AUV), usually composed a cylindrical shell, may be exposed to high hydrostatic pressures where buckling collapse occurs before yield stress failure. In conventional submarines, welded stiffeners increase the resistance, however, in small AUVs, they reduce inner space and cause residual stresses. This work presents innovative concept for structural design AUV, proposing use sliding that are part used accommodate electronics inside it. Since...

10.3390/jmse8070515 article EN cc-by Journal of Marine Science and Engineering 2020-07-14

A trimaran is proposed as an autonomous surface vehicle aimed to oceanographic field missions and research on navigation of underwater vehicles. The paper presents a discussion comparing this kind vessel the monohull catamaran types. Naval architecture aspects design are summarized, details hardware software control presented well.

10.1016/j.ifacol.2018.09.461 article EN IFAC-PapersOnLine 2018-01-01

The influence of the addition bentonite nanoparticles on tensile and flexural strength a thermosetting polymer matrix composite material reinforced with hemp fibers was de-terminated. All composites were manufactured 5% in mass–weight ratios 10 to 45 wt% step 5%. For mechanical characterization, tests performed: scanning electron microscopy energy-dispersive X-ray spectroscopy analyses carried out. samples containing compared fiber affected for all percentages, except 35% while resistance...

10.3390/polym15061571 article EN Polymers 2023-03-22

Recently, bismuth oxyiodide (BiOI) is an attractive semiconductor to use in heterogeneous photocatalysis processes. Unfortunately, BiOI individually shows limited photocatalytic efficiency, instability, and a quick recombination of electron/holes. Considering the practical application this semiconductor, some studies show that synthetic zeolites provide good support for photocatalyst. This material permits better efficiency because it prevents photogenerated pairs. However, optimal...

10.3390/nano12071161 article EN cc-by Nanomaterials 2022-03-31

El objetivo de este trabajo fue obtener una metodología para el análisis del rediseño, un filtro rotatorio, la mejora confiabilidad proceso como elemento integrante operacional. En se adaptó método propuesto por 6 Sigma procesos y implementaron modelos matemáticos los cálculos mantenibilidad. La implementó en filtración producto monoclonal empresa biofarmacéutica, obteniéndose que problemas afectaban parámetros operación estaban asociados a procesos. Se evaluaron tres...

10.4067/s0718-33052022000100124 article ES cc-by Ingeniare. Revista chilena de ingeniería 2022-03-01
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