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Rivas F, Pérez F, Sandoval C, Sanhueza I, Sepúlveda B, Yañez J, Torres S. Copper concentrate dual-band joint classification using reflectance hyperspectral images in the VIS-NIR and SWIR bands. Appl Opt 2023; 62:2970-2977. [PMID: 37133142 DOI: 10.1364/ao.477193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A study on the classification of copper concentrates relevant to the copper refining industry is performed by means of reflectance hyperspectral images in the visible and near infrared (VIS-NIR) bands (400-1000 nm) and in the short-wave infrared (SWIR) (900-1700 nm) band. A total of 82 copper concentrate samples were press compacted into 13-mm-diameter pellets, and their mineralogical composition was characterized via quantitative evaluation of minerals and scanning electron microscopy. The most representative minerals contained in these pellets are bornite, chalcopyrite, covelline, enargite, and pyrite. Three databases (VIS-NIR, SWIR, and VIS-NIR-SWIR) containing a collection of average reflectance spectra computed from 9×9p i x e l neighborhoods in each pellet hyperspectral image are compiled to train the classification models. The classification models tested in this work are a linear discriminant classifier and two non-linear classifiers, a quadratic discriminant classifier, and a fine K-nearest neighbor classifier (FKNNC). The results obtained show that the joint use of VIS-NIR and SWIR bands allows for the accurate classification of similar copper concentrates that contain only minor differences in their mineralogical composition. Specifically, among the three tested classification models, the FKNNC performs the best in terms of overall classification accuracy, achieving 93.4% accuracy in the test set when only VIS-NIR data are used to construct the classification model, up to 80.5% using only SWIR data, and up to 97.6% using both VIS-NIR and SWIR bands together.
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Vásquez A, Pérez F, Roa M, Sanhueza I, Rojas H, Parra V, Balladares E, Parra R, Torres S. A Radiometric Technique for Monitoring the Desulfurization Process of Blister Copper. Sensors (Basel) 2021; 21:s21030842. [PMID: 33513861 PMCID: PMC7865781 DOI: 10.3390/s21030842] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/12/2021] [Accepted: 01/24/2021] [Indexed: 11/16/2022]
Abstract
In this paper, a novel optical technique for following the progress of the blister copper desulfurization process is presented. The technique is based on the changes observed in the continuous spectrum of the visible-near-infrared (VIS-NIR) radiation that the blister melt emits while the chemical reactions of the sulfur elimination process are taking place. Specifically, the proposed technique uses an optical probe composed of an optical fiber, a collimating lens, and a quartz tube, which is immersed in the melt. This optical probe provides a field of view of the blowing zone where the desulfurization reaction occurs. The experimental results show that the melt VIS-NIR total irradiance evolves inversely to the SO2 concentration reported by a gas analyzer based on differential optical absorption spectroscopy. Furthermore, the blister copper spectral emissivity as well as the total emissivity observed throughout the process show strong correlation with the sulfur content during desulfurization reaction.
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Affiliation(s)
- Alejandro Vásquez
- Metallurgical Engineering Department, University of Concepción, Edmundo Larenas 285, Concepción CCP4070386, Chile; (M.R.); (H.R.); (V.P.); (E.B.); (R.P.)
- Correspondence: ; Tel.: +56-930-983-176
| | - Francisco Pérez
- Electrical Engineering Department, University of Concepción, Edmundo Larenas 219, Concepción CCP4070386, Chile; (F.P.); (I.S.); (S.T.)
| | - Maximiliano Roa
- Metallurgical Engineering Department, University of Concepción, Edmundo Larenas 285, Concepción CCP4070386, Chile; (M.R.); (H.R.); (V.P.); (E.B.); (R.P.)
| | - Ignacio Sanhueza
- Electrical Engineering Department, University of Concepción, Edmundo Larenas 219, Concepción CCP4070386, Chile; (F.P.); (I.S.); (S.T.)
| | - Hugo Rojas
- Metallurgical Engineering Department, University of Concepción, Edmundo Larenas 285, Concepción CCP4070386, Chile; (M.R.); (H.R.); (V.P.); (E.B.); (R.P.)
| | - Victor Parra
- Metallurgical Engineering Department, University of Concepción, Edmundo Larenas 285, Concepción CCP4070386, Chile; (M.R.); (H.R.); (V.P.); (E.B.); (R.P.)
| | - Eduardo Balladares
- Metallurgical Engineering Department, University of Concepción, Edmundo Larenas 285, Concepción CCP4070386, Chile; (M.R.); (H.R.); (V.P.); (E.B.); (R.P.)
| | - Roberto Parra
- Metallurgical Engineering Department, University of Concepción, Edmundo Larenas 285, Concepción CCP4070386, Chile; (M.R.); (H.R.); (V.P.); (E.B.); (R.P.)
| | - Sergio Torres
- Electrical Engineering Department, University of Concepción, Edmundo Larenas 219, Concepción CCP4070386, Chile; (F.P.); (I.S.); (S.T.)
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Gutiérrez P, Godoy SE, Torres S, Oyarzún P, Sanhueza I, Díaz-García V, Contreras-Trigo B, Coelho P. Improved Antibiotic Detection in Raw Milk Using Machine Learning Tools over the Absorption Spectra of a Problem-Specific Nanobiosensor. Sensors (Basel) 2020; 20:s20164552. [PMID: 32823811 PMCID: PMC7472326 DOI: 10.3390/s20164552] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 07/22/2020] [Accepted: 07/24/2020] [Indexed: 02/01/2023]
Abstract
In this article we present the development of a biosensor system that integrates nanotechnology, optomechanics and a spectral detection algorithm for sensitive quantification of antibiotic residues in raw milk of cow. Firstly, nanobiosensors were designed and synthesized by chemically bonding gold nanoparticles (AuNPs) with aptamer bioreceptors highly selective for four widely used antibiotics in the field of veterinary medicine, namely, Kanamycin, Ampicillin, Oxytetracycline and Sulfadimethoxine. When molecules of the antibiotics are present in the milk sample, the interaction with the aptamers induces random AuNP aggregation. This phenomenon modifies the initial absorption spectrum of the milk sample without antibiotics, producing spectral features that indicate both the presence of antibiotics and, to some extent, its concentration. Secondly, we designed and constructed an electro-opto-mechanic device that performs automatic high-resolution spectral data acquisition in a wavelength range of 400 to 800 nm. Thirdly, the acquired spectra were processed by a machine-learning algorithm that is embedded into the acquisition hardware to determine the presence and concentration ranges of the antibiotics. Our approach outperformed state-of-the-art standardized techniques (based on the 520/620 nm ratio) for antibiotic detection, both in speed and in sensitivity.
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Affiliation(s)
- Pablo Gutiérrez
- Departamento de Ingeniería Eléctrica, Facultad de Ingeniería, Universidad de Concepción, Concepción 4030000, Chile; (P.G.); (S.E.G.); (S.T.); (I.S.)
| | - Sebastián E. Godoy
- Departamento de Ingeniería Eléctrica, Facultad de Ingeniería, Universidad de Concepción, Concepción 4030000, Chile; (P.G.); (S.E.G.); (S.T.); (I.S.)
| | - Sergio Torres
- Departamento de Ingeniería Eléctrica, Facultad de Ingeniería, Universidad de Concepción, Concepción 4030000, Chile; (P.G.); (S.E.G.); (S.T.); (I.S.)
| | - Patricio Oyarzún
- Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Lientur 1457, Concepción 4080871, Chile; (V.D.-G.); (B.C.-T.); (P.C.)
- Correspondence: ; Tel.: +56-41-220-34-01
| | - Ignacio Sanhueza
- Departamento de Ingeniería Eléctrica, Facultad de Ingeniería, Universidad de Concepción, Concepción 4030000, Chile; (P.G.); (S.E.G.); (S.T.); (I.S.)
| | - Victor Díaz-García
- Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Lientur 1457, Concepción 4080871, Chile; (V.D.-G.); (B.C.-T.); (P.C.)
| | - Braulio Contreras-Trigo
- Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Lientur 1457, Concepción 4080871, Chile; (V.D.-G.); (B.C.-T.); (P.C.)
| | - Pablo Coelho
- Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Lientur 1457, Concepción 4080871, Chile; (V.D.-G.); (B.C.-T.); (P.C.)
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Sanhueza I, Manrique-Huarte R, Calavia D, Huarte A, Manrique M. Hearing Impairment and Quality of Life in Adults with Asymmetric Hearing Loss: Benefits of Bimodal Stimulation. J Int Adv Otol 2020; 15:62-69. [PMID: 31058597 DOI: 10.5152/iao.2019.6224] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES Bimodal stimulation for asymmetric hearing loss is an emerging treatment with proven audiometric outcomes. Our objectives are to assess the changes of the hearing impairment and the quality of life of patients treated with this type of stimulation, when compared to a unilateral Cochlear Implant (CI) stimulated condition. MATERIALS AND METHODS 31 patients with asymmetric hearing loss (Group 1) were recruited for the study. They were divided into three groups, based on their hearing loss in the ear treated with the hearing aid: Group 1A (Pure Tone Audiometry (PTA) between 41 and 70 decibels (dB)); Group 1B, (PTA between 71 and 80 dB) and Group 1C (PTA between 81 and 90 dB). 30 patients had profound, bilateral hearing loss. Then, users of a unilateral cochlear implant were recruited for the control group. Their hearing impairment and quality of life were analyzed with questionnaires Abbreviated Profile of Hearing Aid Benefit (APHAB), Speech, Spatial and Qualities of Hearing Scale (SSQ) and the Health Utilities Index (HUI). They were followed up for at least 2 years. RESULTS The group with the asymmetric hearing loss obtains a statistically significant clinical improvement in the APHAB under category "with hearing aid" compared to "without hearing aid". The group with the asymmetric hearing loss benefits more across basically all variables compared with the control group in the SSQ. Group 1A obtains the best outcome of the sample in the HUI. CONCLUSION Bimodal stimulation and better hearing in the ear treated with the hearing aid reduce hearing impairment and improve the quality of life.
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Affiliation(s)
- Ignacio Sanhueza
- Department of ENT, Complejo Hospitalario de Navarra, Pamplona, Spain
| | | | - Diego Calavia
- Department of ENT, Clinica Universidad de Navarra, Pamplona, Spain
| | - Alicia Huarte
- Department of ENT, Clinica Universidad de Navarra, Pamplona, Spain
| | - Manuel Manrique
- Department of ENT, Clinica Universidad de Navarra, Pamplona, Spain
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Kaplan V, Morales C, Bobadilla F, Fernández J, Segovia L, Vera V, Sanhueza I. Epidemiologic and Histopathologic Characterization of Cutaneous Metastases in Patients Who Visited 2 Hospitals in Santiago de Chile Between 2005 and 2017. Actas Dermo-Sifiliográficas (English Edition) 2019. [DOI: 10.1016/j.adengl.2019.02.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Kaplan V, Morales C, Bobadilla F, Fernández J, Segovia L, Vera V, Sanhueza I. Epidemiologic and Histopathologic Characterization of Cutaneous Metastases in Patients Who Visited 2 Hospitals in Santiago de Chile Between 2005 and 2017. Actas Dermosifiliogr (Engl Ed) 2018; 110:220-226. [PMID: 30577946 DOI: 10.1016/j.ad.2018.07.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 06/12/2018] [Accepted: 07/15/2018] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND AND OBJECTIVE Cutaneous metastases (CMs) account for 2% of skin tumors and their incidence varies between 0.7% and 9% in patients with cancer. The objective of this study was to describe and analyze the demographic, clinical, and histopathologic characteristics of CM in patients who visited 2 hospitals in the Santiago de Chile metropolitan region. MATERIAL AND METHOD We performed a retrospective, descriptive, analytical, observational, cross-sectional study. We reviewed the pathology reports, patient records, pathology slides, and dates of death for diagnosed cases of CM from the anatomic pathology departments of 2 hospitals in the Santiago de Chile metropolitan region between 2015 and 2017. RESULTS Ninety-six patients with CM were included in the study; 60.42% were women and 39.58% were men. The mean (SD) age was 67.95 (13.74) years, with a range of 28 to 96 years. The most common primary tumor was melanoma in 27.08% of cases (n=26), followed by breast cancer (18.75%, n=18), and adenocarcinoma (15.63%, n=15). The median time between diagnosis of the tumor and cutaneous metastasis was 9 months. Patients with CM of melanoma had a higher survival rate than patients with metastasis of other primary tumors (P<.05). A histopathologic study of 91 slides showed that diffuse infiltration of the tissue with tumor cells was the most common pattern and vascular invasion was rare. CONCLUSIONS The results are similar to those found worldwide. CM is a rare manifestation of internal tumors. It presents mainly at an advanced age and is equally prevalent in both sexes.
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Affiliation(s)
- V Kaplan
- Departamento de Dermatología y Venereología, Universidad de Chile, Santiago, Chile.
| | - C Morales
- Servicio de Anatomía Patológica, Hospital Clínico de la Universidad de Chile, Santiago, Chile
| | - F Bobadilla
- Servicio de Dermatología y Venereología, Hospital Barros Luco Trudeau, Santiago, Chile
| | - J Fernández
- Servicio de Dermatología y Venereología, Hospital San José, Santiago, Chile
| | - L Segovia
- Servicio de Anatomía Patológica, Hospital Barros Luco Trudeau, Santiago, Chile
| | - V Vera
- Departamento de Nutrición, Universidad de Chile, Santiago, Chile
| | - I Sanhueza
- Facultad de Medicina, Universidad de Chile, Santiago, Chile
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Sanhueza I, Manrique R, Huarte A, de Erenchun I, Manrique M. Bimodal Stimulation with Cochlear Implant and Hearing Aid in Cases of Highly Asymmetrical Hearing Loss. J Int Adv Otol 2016; 12:16-22. [DOI: 10.5152/iao.2016.2185] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Manrique R, Sanhueza I, Manrique M. Attic Exposure–Antrum Exclusion as an on Demand Surgical Technique for Cholesteatoma. Acta Otorrinolaringologica (English Edition) 2013. [DOI: 10.1016/j.otoeng.2013.02.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Manrique R, Sanhueza I, Manrique M. [Attic exposure-antrum exclusion as an on demand surgical technique for cholesteatoma]. Acta Otorrinolaringol Esp 2012; 64:22-30. [PMID: 23068573 DOI: 10.1016/j.otorri.2012.06.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 06/26/2012] [Accepted: 06/29/2012] [Indexed: 11/24/2022]
Abstract
INTRODUCTION AND OBJECTIVE Attic exposure and antrum exclusion (AE-AE) is an on demand surgical technique for the treatment of cholesteatoma. Several techniques have been described with variable recurrence rates. The aim of the study was to describe this surgical technique and its indications and to analyse long-term outcomes. MATERIALS AND METHODS Forty-two patients were included. They received AE-AE in a tertiary centre and were followed-up from 6 months to 7 years. The surgical technique exposes the attic by drilling the superior wall of the external auditory canal and excludes the antrum and the mastoid cells by closing the aditus with a cartilage graft. It is indicated if the lesion does not go beyond the aditus or, if it does, it is a delimited cholesteatoma not damaging the labyrinth. The patients were followed-up by physical examination and radiology (CT scan and Non-EPI diffusion-weighted MRI since 2009). RESULTS The recurrence rate of the cholesteatoma was 4.8%. At recurrence, an open canal-wall-down mastoidectomy technique was performed. The rate of otorrhea (2/42 cases), serous otitis (2/42) and other complications was low, so aquatic activities were not contraindicated. The AE-AE did not modify ossicular chain reconstruction with respect to the rest of surgical techniques. CONCLUSIONS AE-AE is a canal-wall-down technique. Its purpose is to remove the lesion and to reduce the recurrence of cholesteatoma. In addition, it allows the entrance of water and reduces the need for 2(nd) look surgery. Non-EPI diffusion-weighted MRI is a reliable technique for follow-up, especially for the excluded mastoid.
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Affiliation(s)
- Raquel Manrique
- Departamento de Otorrinolaringología, Clínica Universidad de Navarra, Pamplona, Navarra, España.
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Baptista P, Sanhueza I, De Abajo J. 24-Hour Rhinoflowmetry. Otolaryngol Head Neck Surg 2010. [DOI: 10.1016/j.otohns.2010.06.562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Alcalde JM, Gimeno-Vilar C, Montes-Jovellar L, Manrique R, Sanhueza I. Reconstrucción de defectos faríngeos. Acta Otorrinolaringológica Española 2009; 60:283-90. [DOI: 10.1016/j.otorri.2009.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2008] [Accepted: 03/05/2009] [Indexed: 11/30/2022]
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Alcalde JM, Gimeno-Vilar C, Montes-Jovellar L, Manrique R, Sanhueza I. Reconstruction of pharyngeal defects. Acta Otorrinolaringologica (English Edition) 2009. [DOI: 10.1016/s2173-5735(09)70144-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Mallol J, Cortez E, Amarales L, Sánchez I, Calvo M, Soto S, Strickler A, Kyling A, Sanhueza I, Albornoz C. [Prevalence of asthma in Chilean students. Descriptive study of 24,470 children. ISAAC-Chile]. Rev Med Chil 2000; 128:279-85. [PMID: 10962869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
BACKGROUND There is little information about the prevalence of asthma in Latin American children. AIM To determine the prevalence of asthma among Chilean school age children. SUBJECTS AND METHODS The prevalence of respiratory symptoms related to asthma in schoolchildren aged 7 and 13 years, coming from South Santiago, Central Santiago, Valdivia and Punta Arenas, was determined using the methodology of the International Study on Asthma and Allergies in Childhood (ISMC). A random sample of school children aged 6-7 and 13-14 years from each locality was selected. This resulted in 24)470 surveyed children (11,723 aged 6-7 years and 12,747 aged 13-14 years). RESULTS The current prevalence of wheezing ("wheezing in the last 12 months") ranged from 16.5% to 20.0% in children aged 67 years, and from 6.8% to 11.7% in children aged 13-14 years. The cumulative prevalence of asthma ("asthma ever"), ranged from 9.7% and 16.5% in the 6-7 years group and from 7.3% to 12.4% in those aged 13-14 years. CONCLUSIONS This study found much higher figures for prevalence of respiratory symptoms related to asthma in school children than those previously reported in this country, with a significant variability between centers (p < 0.05). The prevalence of asthma in Chilean schoolchildren is as high and variable as that reported in industrialized countries.
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Affiliation(s)
- J Mallol
- Hospital CRS El Pino, Departamento de Medicina Respiratoria Infantil, Facultad de Ciencias Médicas, Universidad de Santiago de Chile.
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Gutiérrez JH, Gigoux C, Sanhueza I. Physical and chemical deterioration of endodontic reamers during mechanical preparation. Oral Surg Oral Med Oral Pathol 1969; 28:394-403. [PMID: 4979374 DOI: 10.1016/0030-4220(69)90234-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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