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Exponential Continuous Non-Parametric Neural Identifier With Predefined Convergence Velocity

IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 1049-1060页

作者： Mariana Ballesteros Rita Q.Fuentes-Aguilar Isaac Chairez Instituto Politécnico Nacional Centro de Innovación y Desarrollo Tecnológico en Cómputo Unidad Profesional Interdisciplinaria de Biotecnología 07340Mexico CityMexico Tecnológico de Monterrey School of Engineering and SciencesZapopanJalisco 45138Mexico department of Bioprocesses UPIBIInstituto Politécnico Nacional07340Mexico City

This paper addresses the design of an exponential function-based learning law for artificial neural networks(ANNs)with continuous dynamics.The ANN structure is used to obtain a non-parametric model of systems with uncertainties,which are described by a set of nonlinear ordinary differential equations.Two novel adaptive algorithms with predefined exponential convergence rate adjust the weights of the ANN.The first algorithm includes an adaptive gain depending on the identification error which accelerated the convergence of the weights and promotes a faster convergence between the states of the uncertain system and the trajectories of the neural identifier.The second approach uses a time-dependent sigmoidal gain that forces the convergence of the identification error to an invariant set characterized by an ellipsoid.The generalized volume of this ellipsoid depends on the upper bounds of uncertainties,perturbations and modeling errors.The application of the invariant ellipsoid method yields to obtain an algorithm to reduce the volume of the convergence region for the identification error.Both adaptive algorithms are derived from the application of a non-standard exponential dependent function and an associated controlled Lyapunov function.Numerical examples demonstrate the improvements enforced by the algorithms introduced in this study by comparing the convergence settings concerning classical schemes with non-exponential continuous learning methods.The proposed identifiers overcome the results of the classical identifier achieving a faster convergence to an invariant set of smaller dimensions.

关键词： Exponential Lyapunov functions learning laws non-parametric identifier predefined convergence rate

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Bacterial and archaeal communities in saline soils from a Los Negritos geothermal area in Mexico

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Pedosphere 2023年第2期33卷 312-320页

作者： Joseph GUEVARA-LUNA Mario HERNÁNdeZ-GUZMÁN Nina MONTOYA-CIRIACO Luc deNDOOVEN Marina Olivia FRANCO-HERNÁNdeZ Paulina ESTRADA-de LOS SANTOS María Soledad VÁSQUEZ-MURRIETA Escuela Nacional de Ciencias Biológicas Instituto Politécnico NacionalCiudad de México 11340(Mexico) Laboratory of Soil Ecology CinvestavMexico City 07360(Mexico) Centro Tlaxcala de Biología de la Conducta Universidad Autónoma de Tlaxcala.Carretera Federal Tlaxcala-Puebla km.1.5Tlaxcala 90070(Mexico) Unidad Profesional Interdisciplinaria de Biotecnología Instituto Politécnico NacionalCiudad de México 07340(Mexico)

In recent years,there has been a growing need to understand how salinity affects microbial communities in agricultural soils.Archaeal and bacterial community diversities and structures were investigated by high-throughput sequencing analysis of their 16S rRNA in two arable soils with low electrical conductivity(EC)(2.3 and 2.6 dS m^(-1))and a saline soil(EC=17.6 dS m^(-1)).The dominant bacterial phyla in the soils were Proteobacteria(relative abundance(RA)=46.2%),followed by Acidobacteria(RA=13.1%)and Actinobacteria(RA=10.0%),whereas Serratia(RA=6.0%)and Bacillus(RA=4.0%)were the dominant bacterial genera.Candidatus Nitrososphaera(53.5%)was the dominant archaeal phylotype in the arable soils,whereas Nitrosopumilus(RA=0.4%)dominated in the saline soil.The archaeal and bacterial community structures were different between the soils and significantly correlated with soil sand,arsenic,barium,and antimony contents,but not with soil salinity.

关键词： agricultural soil compositional approach microbial community mud volcano soil salinity soluble anion

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Use of Prosopis laevigata Seed Gum and Opuntia ficus-indica Mucilage for the Treatment of Municipal Wastewaters by Coagulation-Flocculation

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Natural Resources 2012年第2期3卷 35-41页

作者： Luis G. Torres Sandra L. Carpinteyro-Urban department of Bioprocesses Unidad Profesional Interdisciplinaria de Biotecnología UPIBI-Instituto Politécnico Nacional Mexico

Prosopis laevigata and Opuntia ficus-indica grow in arid and semiarid regions of Mexico and other countries. Both produce biopolymers with interesting characteristics from the rheological point of view as well as because of their coagulating-flocculating capabilities. Prosopis produce galactomannans inside the endosperm, very similar to those found in guar, locust bean, and tara gums. Opuntia sp. produces mucilage that contains polygalacturonic acid and five neutral sugars. Prosopis seed gum has not been proposed to be used as coagulant-flocculant before. In the case of Opuntia mucilage, some authors have suggested its use in the treatment of waters, using either the mucilage or the whole cladode powder. The use of these products in the treatment of municipal or even industrial wastewaters could give rise to diverse benefits. From the environmental point of view, treated waters with neither Fe nor Al, nor synthetic polymers would be obtained (with less toxicity risk). Besides, the produced sludges would be smaller in amount, with better biodegradability, and lower metals content. From the economical point of view, the use of these biopolymers would give an added value to the Opuntia and Prosopis culture in Mexico, helping small communities to enhance their incomes by producing environmental-friendly products. This work shows that both Prosopis galactomannan and Opuntia mucilage can be used to treat municipal wastewaters with an initial organic charge of about 827 mg/L as COD by the coagulation-flocculation process, with COD removals for the mesquite seed gum of up to 90% (pH 10, dose of 75 mg/L) and of 60% (pH 7, doses of 50 and 150 mg/L). In the case of mucilage, 65% of the initial COD was removed at pH 10 (dose of 50 mg/L). These figures are very promising for the treatment of wastewaters, with environmental-friendly products.

关键词： Biopolymers Coagulation Flocculation Opuntia ficus Mucilage Prosopis laevigata Seed Gum Wastewaters

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The Effect of Brain Gym on Global Cognitive Function of Institutionalized Older People

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International Journal of Mental Health Promotion 2022年第3期24卷 375-383页

作者： Araceli Cano-Estrada Araceli Jimenez-Mendoza denny Contreras-Guerrero Mario Hernandes-Alejandro Andres Salas-Casas Escuela Superior de Tlahuelilpan Universidad Autónoma del Estado de HidalgoTlahuelilpanHidalgoMéxico Escuela Nacional de Enfermería y Obstetricia.Universidad Nacional Autónoma de México Mexico CityMéxico departomento de Bioingenieria Unidad Profesional Interdisciplinaria de Biotecnología del Instituto Politecnico Nacional(UPIBIIPN)Mexico CityMexico Instituto de Ciencias de la Salud.Universidad Autónoma del Estado de Hidalgo.Pachuca Hidalgo.México.Scuela Superior de TlahuelilpanUniversidad Autónoma del Estado de HidalgoTlahuelilpanHidalgoMéxico

Cognitive function of older adults is influenced by several factors such as age,sex,education,and physical activity so that it can impact the decrease in progressive cognitive function.It is necessary to implement cognitive training in old people’s care to prevent or delay the onset of age-related cognitive decline.Brain gym is a series of simple motion exercises and is an alternative therapy that stimulates the brain.This study aims to evaluate the effect of brain gym as a cognitive training intervention on global cognitive functioning of institutionalized older population.The study is a non-randomized quasi-experimental one using pre-and post-test control group design.The participants of the study were 65 years old or older who had been part of gerontological centers from a local community.They were divided into two groups:control and intervention,each one with 15 people.Mini-Mental State Examination was applied to the sample before and after the cognitive training.The brain gym training consists of bi-weekly group meeting for 12 weeks,lasting 50 min each.The treated group had a significantly better global cognitive function.Recalling(memory),orientation and language skills were the domains with the most significant changes(pder people lease type your abstract here.Abstract of a research paper is typically 200 to 400 words in length,and 150 to 300 words for a review paper.Abstract shall be running continuously(not structured)and shall not include reference citations.Abbreviations that appear only once in the abstract should be defined in full.If abbreviations appear more than once,the full definitions should be provided first before they can be used elsewhere.

关键词： Cognitive function brain gymnastic older people gerontological center physical activity

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Experimental model standardizing polyvinyl alcohol hydrogel to simulate endoscopic ultrasound and endoscopic ultrasoundelastography

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World Journal of Gastroenterology 2020年第34期26卷 5169-5180页

作者： Elymir S Galvis-García Sergio Sobrino-Cossío Arturo Reding-Bernal Yesica Contreras-Marín Karina Solórzano-Acevedo Patricia González-Zavala Rosa M Quispe-Siccha unidad de Endoscopía Gastrointestinal Hospital General de México"Dr.Eduardo Liceaga"Mexico 06720Mexico unidad de Endoscopia y Fisiología Digestiva HospitalÁngeles del PedregalMexico 10700Mexico Dirección de Investigación Hospital General de México“Dr.Eduardo Liceaga”Mexico 06720Mexico Unidad Profesional Interdisciplinaria de Biotecnología and unidad de Investigación y desarrollo Tecnológico Instituto Politécnico Nacional and Hospital General de México"Dr.Eduardo Liceaga"Mexico 06720Mexico Instituto de Investigaciones en Materiales and unidad de Investigación y desarrollo Tecnológico Universidad Nacional Autónoma de México and Hospital General de México"Dr.Eduardo Liceaga"Mexico 06720Mexico unidad de Investigación y desarrollo Tecnológico Hospital General de México"Dr.Eduardo Liceaga"Mexico 06720Mexico

BACKGROUND Endoscopic ultrasound(EUS)and endoscopic ultrasound elastography(EUS-E)simulation lessens the learning curve;however,models lack realism,diminishing competitiveness.AIM To standardize the mechanical properties of polyvinyl alcohol(PVA)hydrogel for simulating organs and digestive lesions.METHODS PVA hydrogel(Sigma Aldrich,degree of hydrolysis 99%)for simulating EUS/EUS-E lesions was investigated in unidad de Investigación y desarrollo Tecnológico at Hospital General de México“Dr.Eduardo Liceaga”,Mexico City.We evaluated physical,contrast,elasticity and deformation coefficient characteristics in lesions,applying Kappa’s concordance and satisfaction questionnaire(Likert 4-points).RESULTS PVA hydrogel showed stable mechanical properties.density depended on molecular weight(MW)and concentration(C).PVA bblocks with the greatest density showed lowest tensile strength(r=-0.8,P=0.01).Lesions were EUSgraphically visible.Homogeneous and heterogeneous examples were created from PVA blocks or PVA phantoms,exceeding(MW2=146000-186000,C9=15%and C10=20%)with a density under(MW1=85000-124000,C1=7%and C2=9%).We calculated elasticity and deformation parameters of solid(blue)areas,contrasting with the norm(Kappa=0.8;high degree of satisfaction).CONCLUSION PVA hydrogels were appropriate for simulating organs and digestive lesions using EUS/EUS-E,facilitating practice and reducing risk.Repetition amplified skills,while reducing the learning curve.

关键词： Endoscopic ultrasound simulators in endoscopy Polyvinyl alcohol Endoscopic ultrasound Endoscopic ultrasound elastography Strain Elasticity

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Ca-alginate spheres behavior in presence of some solvents and water-solvent mixtures

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Advances in Bioscience and Biotechnology 2011年第1期2卷 8-12页

作者： Luis G. Torres Angelica Velasquez Marco A. Brito-Arias Unidad Profesional Interdisciplinaria de Biotecnología. Instituto Politecnico Nacional. Av. Acueducto s/n. Colonia Barrio la Laguna Ticoman

Immobilization systems more frequently used are calcium alginate spheres. These biocatalysts have many potential applications in the immobilization of enzymes, prokaryotic cells, vegetal and animal cells, algae, organelles and mixtures of these living components. Other applications of immobilized cells imply the use of non aqueous systems. Some bioconversions are carried out in the presence of solvents such as hexane acetone or acetonitrile, or mixtures water-solvents. The aim of this work was to investigate the behaviour of Ca-alginate spheres when put in contact with different solvents (water, diesel, ethanol, methanol, acetone, n-hexane, isopropyl alcohol, THF, acetonitrile, and toluene), or solvent-water mixtures (i.e., ethanol-water), regarding the resistance of the alginate spheres after days of contact. Calcium alginate particles suffered different damages, depending on the solvent they were put in contact. Water did not damaged the Ca-alginate structure with or without Ca present. On the other hand different solvents lost a proportion of volume, i.e., n-hexane (16%), methanol (19%), ethanol (19.5%), toluene (22%), diesel (34%), acetone (765), isopropyl alcohol (80%), THF and acetonitrile (total loss, total destruction). Nor the dielectric constant nor the polarity indexes were capable of explaining the difference on the volume loss or total sphere destruction, except for water-ethanol mixtures.

关键词： Dielectric Constant Ca-Alginate Immobilization Solvents Spheres Polarity Index

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Zinc and Lead Biosorption by delftia tsuruhatensis: A Bacterial Strain Resistant to Metals Isolated from Mine Tailings

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Journal of Water Resource and Protection 2012年第4期4卷 207-216页

作者： Dorian A. Bautista-Hernández Landy I. Ramírez-Burgos Enrique Duran-Páramo Luis Fernández-Linares Faculty of Chemistry Programa de Ingeniería Química Ambiental y Química Ambiental PIQAyQA Universidad Nacional Autónoma de México México City México Laboratory of Bioprocesses Department of Bioprocesses Unidad Profesional Interdisciplinaria de Biotecnología UPIBI-Instituto Politécnico Nacional México City México Rearch Centre for Environmental Quality Instituto Tecnológico de Estudios Superiores de Monterrey Campus Estado de México Atizapán de Zaragoza México

A bacterial strain capable of Zinc and Lead biosorption was isolated from mine tailings. This strain showed the highest minimum inhibitory concentrations (MIC) of metals among other isolates in metal-resistance tests. Sorption tests were conducted placing 0.015 g of dry biomass in 10 ml of metallic solution at fixed pH. Contact was analyzed at different times (kinetics) and different initial concentrations (isotherm). The biomass was separated by centrifugation and the concentration of non-absorbed metal was determined using atomic absorption spectroscopy. The strain was identified by 16S sequencing as delftia tsuruhatensis. The order of toxicity of the metals to the bacterium was Zn > Pb > Se > Ni > Cu = Al. Zinc and Lead absorption kinetics were adjusted to the pseudo second order equation (r2 = 0.99), showing that equilibrium was reached at 40 and 20 min, respectively. Maximal absorption of Pb and Zn was 0.216 and 0.207 mmol?g–1, respectively;which can be considered a median magnitude capacity when compared to other biosorbents described in the literature.

关键词： Biosorption Langmuir and Freundlich Isotherms delftia Tsuruhatensis Pb(II) Zn(II)

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Disinfection of Primary Municipal Wastewater Effluents Using Continuous UV and Ozone Treatment

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Journal of Water Resource and Protection 2014年第1期6卷 16-21页

作者： Yaneth Bustos Mabel Vaca Raymundo López Erick Bandala Luis Torres Neftalí Rojas-Valencia departamento de Energía Ciencias Básicas e Ingeniería Universidad Autónoma Metropolitana Azcapotzalco México departamento de Ingeniería Civil y Ambiental Universidad de las Américas Puebla. Sta. Catarina Mártir Cholula México Unidad Profesional Interdisciplinaria de Biotecnología Instituto Politécnico Nacional México D. F. México Universidad Nacional Autónoma de México Instituto de Ingeniería Coordinación de Ingeniería Ambiental México D. F. México

UV radiation and ozonation were investigated as disinfection alternatives for the wastewater treatment plant. The inactivation of total and fecal coliforms using ozone and ultraviolet radiation as separate treatments was evaluated. Different ozone concentrations (3 to 40 mg O3/L) were applied and UV fluencies ranging from 8.5 to 12 mJ/cm2 at different pH values (from 5 to 9) were tested. Best results were obtained for ozone doses near 20 mg/min with removals of 72% and 78% of fecal and total coliforms, respectively. The ozone also was capable of oxidizing organic matter in the effluent measured as COD (the highest removal obtained was 36% for 20 mg O3/min). Maximum bacterial resistance was observed at pH 7 in both cases. The UV light offered a high bacterial inactivation (over 80%) and the lowest bacterial inactivation was observed at pH 7. Finally, we obtained the electric energy per order (EEO, kWh/m3/order), defined as the electric energy (kW-h) required to degrade a contaminant by one order of magnitude in a unit volume of contaminated water, being noteworthy that EEO values for the UV process resulted were lower than those determined for the process with ozone in all the water flow tested.

关键词： Disinfection Ozone Treatment UV Treatment Wastewater

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Scalability of biomass-derived graphene derivative materials as viable anode electrode for a commercialized microbial fuel cell: A systematic review

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Chinese Journal of Chemical Engineering 2023年第3期55卷 277-292页

作者： Mustapha Omenesa Idris Claudia Guerrero-Barajas Hyun-Chul Kim Asim Ali Yaqoob Mohamad Nasir Mohamad Ibrahim School of Chemical Sciences Universiti Sains Malaysia11800 PenangMalaysia department of Pure and Industrial Chemistry Kogi State UniversityP.M.B 1008 AnyigbaKogi StateNigeria Laboratorio de biotecnologia Ambiental Departamento de BioprocesosUnidad Profesional Interdisciplinaria de BiotecnologiaInstituto Politecnico NacionalAv.Acueducto s/nCol.Barrio La Laguna Ticoman07340 Mexico CityMexico Research Institute for Advanced Industrial Technology College of Science and TechnologyKorea UniversitySejong 30019Republic of Korea

Microbial fuel cell(MFC) is an advanced bioelectrochemical technique that can utilize biomass materials in the process of simultaneously generating electricity and biodegrading or bio transforming toxic pollutants from wastewater. The overall performance of the system is largely dependent on the efficiency of the anode electrode to enhance electron transportation. Furthermore, the anode electrode has a significant impact on the overall cost of MFC setup. Hence, the need to explore research focused towards developing cost-effective material as anode in MFC. This material must also have favourable properties for electron transportation. Graphene oxide(GO) derivatives and its modification with nanomaterials have been identified as a viable anode material. Herein, we discussed an economically effective strategy for the synthesis of graphene derivatives from waste biomass materials and its subsequent fabrication into anode electrode for MFC applications. This review article offers a promising approach towards replacing commercial graphene materials with biomass-derived graphene derivatives in a view to achieve a sustainable and commercialized MFC.

关键词： Microbial fuel cell Biomass Anode fabrication Catalyst design Cost-effective performance

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Biodrying under Greenhouse Conditions as Pretreatment for Horticultural Waste

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Journal of Environmental Protection 2012年第4期3卷 298-303页

作者： Fabian Robles-Martinez Elizabeth M.Silva-Rodriguez Teodoro Espinosa-Solares Belem Pina-Guzman Carmen Calixto-Mosqueda Francisco J.Colomer-Mendoza Enrique Duran-Paramo Unidad Profesional Interdisciplinaria de Biotecnología Instituto Politecnico NacionalMexico CityMexico Gus R.Douglass Institute West Virginia State UniversitySouth CharlestonUSA departamento de Ingenieria Agroindustrial Universidad Autonoma ChapingoTexcocoMexico departamento de Ingenieria Mecanica y Construccion Universitat Jaume ICastellonSpain

The biodrying process was studied as an alternative technology to reduce the mass and volume of horticultural waste. Four static piles were prepared inside a greenhouse: two containing whole waste and two consisting of shredded waste. All the piles were compared with a test pile containing whole waste and placed outside the greenhouse. In two cases, ventilation ducts were installed to improve aeration. Each greenhouse was 2.0 m wide, 3.5 m long and 1.16 m high. The air temperature and relative humidity were monitored both inside and outside the greenhouse. Mass, humidity, organic matter and total nitrogen in the waste were measured. Piles inside the greenhouse showed decreases of 80% and 75% in weight and volume, respectively, during the first 16 days. The data obtained in this work suggest that biodrying could improve the handling and transport of horticultural waste while also minimizing the impact of pollutants.

关键词： Solid Waste Aerobic degradation Stabilization Greenhouse

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