A. González-Angeles

A. González-Angeles
Autonomous University of Baja California | UABC · Departamento de Ingeniería Mecánica (Mexicali)

PhD in science in metallurgical engineering and ceramics

About

60
Publications
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467
Citations
Introduction
Material composites Material science strength of materials
Additional affiliations
August 2006 - January 2016
Autonomous University of Baja California
Position
  • Full time lecturer

Publications

Publications (60)
Preprint
Full-text available
Recycling of composite materials has become a very important topic to develop sustainable solutions for the management of waste generated by industries that use composite materials. This paper presents a bibliographical review on the main recycling methods of composite materials such as: mechanical, chemical, thermal and hybrid. In mechanical recyc...
Article
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This study conducts a numerical comparison of the thermal performance of three distinct working fluids (pure water, TiO2, and SiO2 water-based nanofluids) within an evacuated tube solar collector using Computational Fluid Dynamics. The study evaluates thermohydraulic performance alongside global and local entropy generation rates, while considering...
Article
Full-text available
The development and constant improvement of accurate predictive models of electricity generation from photovoltaic systems provide valuable planning tools for designers, producers, and self-consumers. In this research, an adaptive neuro-fuzzy inference model (ANFIS) was developed, which is an intelligent hybrid model that integrates the ability to...
Article
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Al2O3 and Ta2O5 were added to the natural clay coming from a mine with open-cast extraction, to improve its refractory properties. The clay was ground in a ball mill, then submitted to cold isostatic pressure at 27 MPa and sintered at 1150°C. Composition was determined through X-ray fluorescence and X-ray diffraction. Apparent porosity, bulk densit...
Article
Full-text available
Se modificó el proceso de liofilizado en el pimiento morrón verde para preservar su sabor, color, textura y propiedades naturales y reducir el gasto energético. En este proceso se compararon 6 pre tratamientos alcalinos diferentes utilizando aceites de oliva, aguacate, coco, uva, sésamo y cártamo para reducir el tiempo requerido para los pasos de d...
Article
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In order to know the process and inform the opinion of the graduates during the period 2016-2 to 2019-1, an online survey was carried out. 453 graduates attended the survey, exceeding the sample calculated with 95% confidence and 5% error (312 graduates) of the 11-degree programs offered by the Faculty of Engineering. The results show that 87.74% o...
Chapter
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Proximal humerus fractures are becoming more common due to the aging of the population, and more related scientific research is also emerging. Biomechanical studies attempt to optimize treatments, taking into consideration the factors involved, to obtain the best possible treatment scenario. To achieve this, the use of finite element analysis (FEA)...
Article
Full-text available
Proximal humerus fractures increase with the aging of the population. Due to the high failure rates of surgical treatments such as open reduction and internal fixation (ORIF), biomechanical studies seek to optimize the treatments and intervening factors to improve the quality of life of people undergoing these treatments. The aim of the present stu...
Chapter
Full-text available
A method is proposed to improve work performance through an adequate design of the manufacturing cell along with optimal environmental conditions to contribute to the well-being of the worker. The methodology used was divided into four stages: the first corresponds to the analysis of operations; the second is the analysis of the effect of the desig...
Article
In this paper, a switching fuzzy logic controller (SFLC) was proposed to reduce formaldehyde (FA) concentrations in a gross anatomy laboratory. At large vapor levels a hasty fuzzy logic controller (HFLC) first is activated to decrease the hazardous concentration. A switching criterion enables a second precise fuzzy logic controller (PFLC) that smoo...
Article
Full-text available
A method is proposed to improve work performance through an adequate design of the manufacturing cell along with optimal environmental conditions to contribute to the well-being of the worker. The methodology used was divided into four stages: the first corresponds to the analysis of operations; the second is the analysis of the effect of the desig...
Article
This work presents the design, optimization, and a comparative study of a compound parabolic concentrator (CPC) using a tube as a receiver with and without a fin inverted V-shaped receiver (finned receiver). The study was mainly based on numerical analysis obtained by using a ray-tracing simulator in CPCs, in order to evaluate the amount of solar i...
Article
Full-text available
The human factor is becoming increasingly relevant for its role in industrial development; therefore, it is necessary to evaluate the machine-man-environment system in an integrated and not isolated way, as is commonly done, for evaluating the sustainability performance of manufacturing practices. For this reason, in this paper, an ergonomic triad...
Article
Full-text available
Proximal humerus fractures are becoming more common due to the aging of the population, and more related scientific research is also emerging. Biomechanical studies attempt to optimize treatments, taking into consideration the factors involved, to obtain the best possible treatment scenario. To achieve this, the use of finite element analysis (FEA)...
Article
Full-text available
This article proves non-ergonomic postures through virtual simulation and analysis of the work area. Blender software is used to correct non-ergonomic postures after modifying the welding area. The research was conducted finding bad postures in workers, including fatigue levels, through an ergonomic survey in combination with the use of the Likert...
Article
Full-text available
La producción agrícola en el valle de Mexicali ha tenido una historia llena de contrastes. Aunque la actividad agrícola se encuentra en una recesión de la que apenas puede recuperarse, las prácticas agrícolas continúan sin cambios significativos, con la conservación y la gestión sostenible de los recursos como una prioridad. El siguiente estudio bu...
Article
Full-text available
The paper presents a methodology to construct a Discrete Event Simulation model to assess the expansion of a container terminal. The methodology was applied to the Ensenada International Terminal located in Mexico. The simulation integrates all the operations of the container terminal including the arrival of vessels, trucks, and storage of contain...
Article
Full-text available
Purpose: The purpose of this work is to present a method based on the application of method engineering, in order to eliminate downtime and improve the manufacturing cell. Design/methodology/approach: The research strategy employed was a case study applied to a manufacturing company to explore the causes of excessive dead time and low productivity...
Article
Full-text available
Freeze drying process was applied to habanero pepper and modified, in order to reduce energy expenditure on frozen and dehydration techniques. Six alkaline solutions, olive oil, avocado oil, coconut oil, grape oil, sesame oil and safflower oil, were used to reduce time on vacuum chamber. Also, frozen step was modified by using dry ice (CO2) obtaini...
Article
Full-text available
To preserve freshness and nutritional quality of fruits and vegetables is required large energy expenditure due to most storage techniques require low temperatures, making the product difficult to transport and store. Purpose: To reduce energy expenditure, dehydration processes are being improving by pretreatments and changing frozen stage. Meth...
Article
Full-text available
This study focuses on the degradation of kaolinite clay added with Al2O3 and Ta2O5, also known as tantite, to increase its resistance to an acid solution (H2SO4) at 300 °C. The samples tested for degradation were previously crushed, sieved, mixed, formed under cold isostatic pressing and sintered at 1150 °C. X-ray fluorescence (XRF) and X-ray diffr...
Article
Full-text available
This review shows that adding ceramic materials such as ZrO2, ZrSiO4, TiO2, SiO2, Cr2O3, etc., to abase alumina refractory clay, improves the corrosion resistance under the presence of acid (H2SO4, HCl, HNO3, etc) and/or alkaline (NaOH, KOH, Na2O, Ca(OH)2, etc) solutions. Characterization techniques, such as SEM, XRD, ICP-MS analysis, and weight lo...
Article
Full-text available
Un gran número de fracturas de húmero proximal están siendo tratadas con osteosíntesis. Sin embargo, la pérdida de reducción sigue siendo un problema grave, lo que lleva al recorte de tornillo en la articulación humeral y la reoperación. De acuerdo con la teoría del strain interfragmentario, se debe considerar el equilibrio entre una fijación flexi...
Article
Full-text available
Purpose: The following article describes steps along with a mathematical model to determine the technological capability of the aerospace industry of Mexicali in the area of design (ICTD) and manufacturing (ICTM). Design/methodology/approach: This model was performed by weighted variables using factor analysis to identify technological capacities...
Article
Full-text available
This paper proposes a methodology for enabling a 3 axes Mill CNC machine to work in a synchronized operation with 5 axes. Different alternatives for communicating the fifth axis were analyzed, as using a TRT-160 with a microcontroller and an analog multiplexer. Another option could be done by using a CNC via serial bus and a Microcontroller digital...
Article
Full-text available
Surgical options for proximal humeral fractures continue with complications in elderly patients with avascular necrosis, screw cut-out and re-operation rate. The literature suggests that these problems on the fracture fixation could be related to the implant stiffness. The main factors involved in this scenario include the physiological loading con...
Article
Full-text available
The principal goal of biomechanical finite element analysis (FEA) modeling research is to represent the geometry of a study in as real a form as possible. However, this type of simulation is not easy, considering the complexity of the human body and all the biological factors involved; therefore, it is common to use a discretization of the FEA mode...
Conference Paper
Full-text available
About 20% of humerus fractures need a surgical treatment. Surgical options include closed reduction and percutaneous fixation, open reduction and internal fixation and prosthetic arthroplasty [1]. Recent studies have shown high failure rates after fixation of proximal humerus fractures with a range of 8.6% to 22%. Accordingly, loss of reduction and...
Conference Paper
Full-text available
In this study, a design analysis was performed through non-destructive test by rectangular rosette and uniaxial strain gages with FEA, between a structural aerospace assembled component of aluminium and a proposal part machined in one step with the same geometric characteristics. The analysis showed that the proposal part machined in one step has a...
Article
Full-text available
The wide variety of composite materials based on carbon fiber has come to revolutionize the material industry, largely replacing metallic materials such as aluminum and steel alloys mainly used in the aerospace industry. This study was performed a machining procedure for an orthogonal symmetric balanced composite and a comparative analysis of the s...
Article
Full-text available
Exposure to hazardous concentrations of volatile organic compounds indoors in small workshops could affect the health of workers, resulting in respirative diseases, severe intoxication or even cancer. Controlling the concentration of volatile organic compounds is required to prevent harmful conditions for workers in indoor environments. In this doc...
Article
Full-text available
In this document was performed a comparative analysis between unitary piece of aluminum aerospace application (machined by removing material) and an entity composed by several parts that have the same geometrical characteristics. To verify the mechanical properties were tested by uniaxial strain gage and FEA (Finite Element Analysis) with ANSYS. Ac...
Article
Full-text available
Nowadays organizations are involved in a complex environment with continues changing, that should impels the innovations looking for increase production performance, quality improvement, customer satisfaction and create a competitive advantage. Lean manufacturing provides an approach to identify and eliminate waste and all non value added activitie...
Article
Full-text available
The drop of coercivity, while preserving the saturation magnetic polarisation JS of substituted M-type Ba hexaferrites with composition BaFe 12-2x(Me1Me2)xO19, was studied. Divalent Me1 =Ni, Zn, Sn and tetravalent Me2 =Ru, Sn ionic combinations were used in various compounds. Mössbauer spectroscopy was used to reveal sites of replacement of the Fe3...
Article
Full-text available
There has been much research where the flow of patients was improved, but most of this study is case-specific and only a few papers offer guidelines for patient flow analysis and improvement. In this study a general framework for the analysis and improvement of patient flow is presented, based on a literature review and on experience from a case st...
Article
Full-text available
Se desarrolló un modelo de simulación discreta del departamento de Obstetricia-Ginecología de emergencias de un hospital público de la región. Se utilizó el software Arena de Rockwell Automation para analizar el flujo de pacientes, identificar los cuellos de botella y proponer mejoras que reduzcan los tiempos de espera de los pacientes durante su e...
Article
Full-text available
The process of solid-phase carburizing of steel with the use of carbonates of different origin including chemical reagents, limestone and oyster shells is studied. The highest microhardness is obtained in the case of SrCO3, wheres Na2CO3 is shown to be the cheapest and most economically expedient carbonate. A good carburized layer can be obtained u...
Article
The magnetic and structural properties of substituted M-type Ba hexaferrites with composition BaFe12-2x(Me1Me2)xO19 were prepared and studied. Divalent Me1 = Ni, Zn, Sn and tetravalent Me2 = Ru, Zr, Ti, Sn ionic combinations were used in various compounds. The phase purity of the samples was evaluated by temperature dependence of initial susceptibi...
Article
Full-text available
Hopkinson Effect Study in Spinel and Hexagonal Ferrites The magnetic susceptibility shows a Hopkinson peak just below the Curie temperature T C when heating the selected hexagonal and spinel ferrite samples. It is proposed that this peak can be associated with a transition from stable magnetic state to super-paramagnetic relaxation above the blocki...
Article
Full-text available
Results on magnetic studies of Ba0.5Sr0.5Fe12-2x(ZnTi)xO19 and Ba0.75Ca0.25Fe12-2x(ZnTi)xO19, where x = 0.2 to 0.6, ferromagnetic powders prepared by mechanical alloying are discussed. The structural and magnetic properties of the resulting powders were analyzed by thermo-magnetic analysis, X-ray diffraction, scanning electron microscopy, Mössbauer...
Article
Full-text available
Samples of BaFe12-2x(SnSn)xO19 and BaFe12-2x(NiSn)xO19 were processed by high energy milling with 0 A x A 0.4 and 0 A x A 0.3 respectively. Sn2+-Sn4+ mixture considerably improved the saturation magnetization, Ms, (from 60.9 to 66.15 A.m2/kg) and diminished quickly the intrinsic coercivity, Hci, (381.1- 72.33 kA/m) to suitable values for high-densi...
Chapter
Full-text available
NiRu, ZnRu, SnRu and SnSn mixtures considerably improved the saturation magnetization, Ms with low substitution values; diminishing quickly at the same times the coercivity, H ci to suitable values for high-density magnetic recording applications. On the other hand, the NiSn mixture also decreased the coercivity rapidly however without enhancing th...
Article
Full-text available
Ba(Sr)(Me 1 2+ Me 2 4+) x Fe 12-x O 19 hexagonal ferrites preparation with substitution ratio of 0.0 x 0.6. The iron ions were substituted by selected cation combinations (divalent Me 1 2+ = Ni, Zn, Sn, Co and tetravalent Me 2 4+ = Ti, Zr, Ru ions). The samples were synthesised by high energy milling and metallorganic precursor method. A special at...
Article
Full-text available
Substituted M-type ferrite BaFe12-2x(Me1Me 2)xO19, 0 ≤ x ≤ 0.6 was prepared by both mechanical alloying and precursor method, where Me1 = Co, Ni, Zn, Sn and Me2 =Ru, Ti, Zr, Sn. Magnetic phase purity, change of saturation polarization, Curie temperature, coercivity and magnetic susceptibility was studied as function of x. Attention was focused to r...
Chapter
BaFe12−2x Mx Snx O19 compounds, where M=Sn2+, Ni2+ or Zn2+ ions, were synthesized by mechanical milling and partially by citrate precursor methods. Analysis of magneto-crystalline structure has been carried out by Mössbauer spectroscopy. The Sn4+ ions replace Fe3+ ions on 2b and slightly on 2a+4f1 sites, Zn2+ ions strongly prefer 4f1 sites, Sn2+ io...
Article
BaFe12−2x Mx Snx O19 compounds, where M = Sn2+, Ni2+ or Zn2+ ions, were synthesized by mechanical milling and partially by citrate precursor methods. Analysis of magneto-crystalline structure has been carried out by Mössbauer spectroscopy. The Sn4+ ions replace Fe3+ ions on 2b and slightly on 2a + 4f1 sites, Zn2+ ions strongly prefer 4f1 sites, Sn2...
Article
M-type barium hexaferrite fine particles with composition BaFe12−2xSnxRuxO19 (0.0≤x≤0.3) were obtained by mechanical alloying. The effect of Sn2+–Ru4+ substitution on the magnetic properties and microstructure of the powders was investigated by Mössbauer spectroscopy, XRD, vibrating sample magnetometry (VSM) and thermomagnetic analysis. Mössbauer s...
Article
The room temperature magnetic properties and the cation site preferences of NiRu and ZnRu substituted barium hexaferrite BaFe12−x(Ni,Zn)xO19 (0⩽x⩽0.3) were investigated by vibrating sample magnetometry and Mössbauer spectroscopy. (Ni,Zn)Ru substitutions led to a great increase in the saturation magnetization (66.5 Am2/kg) at low concentrations. Mös...
Article
Barium hexaferrite fine particles with composition BaFe12−2xZnxTixO19 (0≤x≤0.6) were obtained by mechanical milling. The effect of Zn–Ti substitution on the magnetic properties and microstructure of the powders were investigated by Mössbauer spectroscopy, XRD, vibrating sample magnetometry (VSM), scanning electron microscopy (SEM) and thermomagneti...
Article
Full-text available
The magnetic and structural properties of substituted Ba hexaferrite M-type samples with composition BaFe 12-2x(Me 1 - Me 2) xO 19, where Me 1 = Zn, Co, Ni, and Me 2 = Zr, Ti, were compared. The powder samples with 0.0 ≤ x ≤ 0.6 were prepared by two processing routes. Different Fe/Ba ratio was used for mechanical alloying (Fe/Ba = 10.0) and for the...
Article
The barium hexaferrites of M-type BaFe12−2x (Co, Ni)x Zrx O19 were synthesized by citrate precursor method in 0.0 ≤ x ≤0.6 range. For comparison, Ni-Zr compounds were also prepared by mechanical milling. Mössbauer measurements show that of Zr4+ ions have preference for 2b and 2a+4f 1 sites whereas Co2+ ions prefer 4 f 2 and 12k positions. Different...
Article
Full-text available
Magnetocrystalline structure and magnetic properties of BaFe12-2xZnxZrxO19 compounds with 0.0≤x≤0.6 were investigated by Mösbauer spectroscopy, thermomagnetic analysis, vibrating sample magnetometry, and TEM microscopy. The ferrite powders were prepared by ball milling (Mx) and by modified citrate precursor method (Sk), respectively. Relatively lar...
Article
The effect of Sn2+–Sn4+ mixture on magnetic properties of BaM has been studied by Mössbauer spectroscopy and vibrating sample magnetometry. The results show that the magnetization reached a maximum for x=0.2 and then diminished. Mössbauer spectra showed that Sn2+–Sn4+ ions preferentially occupy 2b and 4f2 sites, followed by 4f1 and 2a sites; whilst...
Article
Substituted M-type Ba hexaferrites of composition BaFe12−2xMexZrxO19 were investigated, where Me stands for Ni2+, Co2+ or Zn2+. The series with x varying from 0 to 0.6, were prepared by two processing routes. A Fe/Ba ratio of 10 for mechanical alloying and of 10.8 for the citrate precursor method was chosen. It was shown that (Co, Ni, Zn)-Zr doped...
Article
BaFe12−2x(NiSn)xO19 compounds were synthesized via attrition milling and characterized. The substitution, x was changed from 0 to 0.3. The magnetic properties were evaluated by vibrating sample magnetometry and thermomagnetic analysis. Mössbauer spectroscopy and X-ray diffraction techniques were used to investigate the magnetocrystalline structure....
Article
The barium hexaferrites of M-type BaFe12−2x(Co, Ni)xZrxO19 were synthesized by citrate precursor method in 0.0x0.6 range. For comparison, Ni–Zr compounds were also prepared by mechanical milling. Mössbauer measurements show that of Zr4+ ions have preference for 2b and 2a+4f1 sites whereas Co2+ ions prefer 4f2 and 12k positions. Different occupati...

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