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Enhancement of Corrosion Resistance of NiCrFeBSi Coatings Obtained by Flame Thermal Spray Process Adding an Electroless Nickel Coating Ni-P

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Journal of Surface Engineered Materials and Advanced Technology 2017年第4期7卷 86-97页

作者： Arturo Barba-Pingarrón Raúl Valdez-Navarro Félix Sánchez-De Jesus Ana María Bolarín-Miró rafael gonzález-parra Alba Covelo-Villar Miguel ángel Hernández-Gallegos Carlos Domínguez-Ríos Centro de Ingeniería de Superficies y Acabados (CENISA) Facultad de Ingeniería Universidad Nacional Autónoma de México 2 Nivel Edificio “T” (Bernardo Quintana) Circuito Exterior Ciudad Universitaria Ciudad de México México área Académica de Ciencias de la Tierra y Materiales Universidad Autónoma del Estado de Hidalgo Pachuca México Centro de Investigación en Materiales Avanzados Chihuahua México

Flame Thermal Spray (FTS) coatings frequently show some porosity and reduced adherence to substrate, which affect its properties, especially its corrosion resistance. In this work, the corrosion resistance of AISI 1018 carbon steel coated by different methods is compared: electroless nickel (EN) coating, NiCrFeBSi obtained by FTS, duplex coatings of an EN deposit on a layer of NiCrFeBSi obtained by FTS and a layer of NiCrFeBSi on an EN deposit. The coatings were characterized using optical microscopy and scanning electron microscopy techniques, EDS microprobe microanalysis, roughness as well as electrochemical polarization tests to obtain the corrosion rate. The results show the enhancement in the corrosion resistance in saline medium of the duplex coatings, especially of the EN coating on FTS layer.

关键词： Flame Thermal Spray Coatings Electroless Nickel Plating Duplex Coatings Corrosion Resistance

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Envelopes of Commutative Rings

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Acta Mathematica Sinica,English Series 2012年第3期28卷 561-580页

作者： rafael parra Manuel SAORIN Departamento de Clculo. Escuela Bsica Facultad de Ingeniería Universidad de los Andes Departamento de Matemticas Universidad de Murcia

Given a significative class F of commutative rings, we study the precise conditions under which a commutative ring R has an S-envelope. A full answer is obtained when F is the class of fields, semisimple commutative rings or integral domains. When .F is the class of Noetherian rings, we give a full answer when the Krull dimension of R is zero and when the envelope is required to be epimorphic. The general problem is reduced to identifying the class of non-Noetherian rings having a monomorphic Noetherian envelope, which we conjecture is the empty class.

关键词： Noetherian ring envelope local ring artinian ring Krull dimension

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Ayahuasca:Uses,Phytochemical and Biological Activities

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Natural Products and Bioprospecting 2019年第4期9卷 251-265页

作者： Edgar Antonio Estrella‑parra Julio Cesar Almanza‑Pérez Francisco Javier Alarcón‑Aguilar Laboratorio de Farmacología.Dpto.Ciencias de la Salud.Div.C.B.S.Universidad Autónoma Metropolitana Unidad Iztapalapa.Av.San Rafael Atlixco No.186Col.Vicentina09340 Mexico CDMXMexico Laboratorio de Fitoquímica Laboratorio de FarmacognosiaLaboratorio de Fisiología VegetalUnidad UBIPROFES-IztacalaUNAMTlalnepantla de Baz54090 Mexico CDMXMexico

Ayahuasca(caapi,yajé),is a psychoactive brew from the Amazon Basin region of South America traditionally considered a“master plant.”It is prepared as a decoction from Banisteriopsis caapi and Psychotria viridis,which it is thought that it stimulates creative thinking and visual *** healers of the Orinoco and Amazon basins have used traditionally ayahuasca as a healing tool for multiple purposes,particularly to treat psychological disorders in the patients,with some beneficial effects experimentally and clinically ***,several syncretic religions,as the“Uniao de Vegetal”(UDV)group in Brazil,have been spread around the *** use of ayahuasca has been popularized by internet and smart-shops,bringing the psychoactive substance to new highs,emerging new“ayahuasqueros.”Ayahuasca has alkaloids asβ-carbolines and dimethyltryptamines,which inhibit the monoamine oxidase and active the 5-HT_(2A)(5-hydroxytryptamine)receptor,respectively,resulting in hallucinations in the *** induces a psychedelic change in the anteroposterior coupling of the electrophysiological brain oscillations in *** ayahuasca beverage is generating pharmacological,commercial and spiritual interest among the scientific community,government people,and different populations *** goal of this article is to report about the uses,chemistry and biological activities of ayahuasca.

关键词： Ayahuasca Banisteriopsis caapi Psychotria viridis-dimethyltryptamine β-carbolines Psychotherapy

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