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Synthesis of Pt and Pt-Fe nanoparticles supported on mWCNTs used as electrocatalysts in the methanol oxidation reaction

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Journal of Energy Chemistry 2014年第4期23卷 483-490页

作者： J.R.Rodriguez R.m.Félix E.A.Reynoso Y.Gochi-Ponce Y.Verde Gómez S.fuentes moyado G.Alonso-Núez Universidad Nacional Autónoma de mxico Centro de Nanociencias y Nanotecnología Ensenada B.C. C.P.22860 Mexico Instituto Tecnológico de Tijuana Centro de Graduados e Investigación Tijuana B.C. C.P.22000 Mexico Instituto Tecnológico de Oaxaca Departamento de Ingeniería Química y Bioquímica Oaxaca Oax. C.P.68030 Mexico Instituto Tecnológico de Cancún Av.Kabah Km.3 Cancún Q.R. C.P.77500 Mexico

This work reports a feasible synthesis of highly-dispersed Pt and Pt-Fe nanoparticles supported on multiwall carbon nanotubes （mWCNTs） without Fe and multiwall carbon nanotubes with iron （mWCNTs-Fe） which applied as electrocatalysts for methanol electrooxidation. A Pt coordination complex salt was synthesized in an aqueous solution and it was used as precursor to prepare Pt/mWCNTs, Pt/mWCNTs-Fe, and Pt-Fe/mWCNTs using FeC12.4H20 as iron source which were named S 1, S2 and S3, respectively. The coordination complex of platinum （TOA）2PtC16 was obtained by the chemical reaction between （NH4）2PtC16 with tetraoctylammonium bromide （TOAB） and it was characterized by FT-IR and TGA. The materials were characterized by Raman spectroscopy, SEm, EDS, XRD, TEm and TGA. The electrocatalytic activity of Pt-based supported on mWCNTs in the methanol oxidation was investigated by cyclic voltammetry （CV） and chronoamperometry （CA）. Pt-Fe/mWCNTs electrocatalysts showed the highest electrocatalytic activity and stability among the tested electrocatalysts due to that the addition of ＂Fe＂ promotes the OH species adsorption on the electrocatalyst surface at low potentials, thus, enhancing the activity toward the methanol oxidation reaction （mOR）.

关键词： coordination complex salt mWCNTs nanoparticles catalysts electrooxidation

Hepatitis C virus NS5A region mutation in chronic hepatitis C genotype 1 patients who are non-responders to two or more treatments and its relationship with response to a new treatment

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World Journal of Gastroenterology 2017年第25期23卷 4538-4547页

作者： Paloma munoz de Rueda José manuel fuentes RodríguezRosa Quiles Pérez Ana Gila medina Ana Belén martínálvarez Jorge Casado Ruíz ángeles Ruíz Extremera Javier Salmerón Research Support Unit San Cecilio University Hospital of Granada Instituto de Investigación Biosanitaria CIBERehd Instituto de Salud Carlos III Unit for Clinical management of Digestive Diseases San Cecilio University Hospital of Granada Granada University

To determine the number of mutations in the NS5A region of the hepatitis C virus (HCV) and its relationship to the response to antiviral therapy in patients with chronic hepatitis C genotype 1 who are non-responders to two or more treatments. mETHODSSequences within HCV NS5A [PKR binding domain (PKRBD) and the interferon-sensitivity-determining region (ISDR)] were analysed via direct sequencing in a selected cohort of 72 patients, with a total of 201 treatments [interferon-alpha (IFN-α), n = 49; IFN-α + ribavirin (RBV), n = 75; pegylated (peg) IFN-α + RBV, n = 47; first-generation direct-acting antivirals (DAAs), n = 13; and second-generation DAAs, n = 17]. Of these, 48/201 achieved a sustained virological response (SVR) and 153/201 achieved no virological response (NVR). RESULTSFor both regions, treatments resulting in SVR were associated with more baseline mutations than were treatments resulting in NVR (SVR vs NVR; PKRBD: 5.82 ± 3 vs 4.86 ± 2 mutations, P = 0.045; ISDR: 2.65 ± 2 vs 1.51 ± 1.7 mutations, P = 0.005). A decrease or no change in the number of mutations over time between treatments in the PKRBD or ISDR, as shown by sequencing, was associated with patients who usually failed to respond to treatment (PKRBD, P = 0.02; ISDR, P = 0.001). moreover, patients showing a post-treatment baseline viral load > 600000 IU/mL and increased ISDR mutations with respect to the previous treatment were 9.21 times more likely to achieve SVR (P = 0.001). CONCLUSIONThe obtained results show that among patients who have shown no response to two or more antiviral treatments, the likelihood of achieving SVR increases with the genetic variability in the ISDR region (≥ 2 mutations or number of substitutions from the HCV-J and HCV-1 prototype), especially when the viral load is greater than 600000 IU/mL.

关键词： Interferon-based therapy Interferon-free therapy Chronic hepatitis C NS5A region Sustained virological response Number of mutations

Compositional, Functional and Sensory Characteristics of Selected mexican Cheeses

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Food and Nutrition Sciences 2014年第4期5卷 366-375页

作者： Irma Caro Sergio Soto Lucía fuentes Néstor Gutiérrez-méndez Briselda García-Islas Karol E. monroy-Gayosso Javier mateo Centro de Investigación en Ciencia y Tecnología de los Alimentos Instituto de Ciencias Agropecuarias Universidad Autónoma del Estado de Hidalgo Tulancingo Mexico Departamento de Higiene y Tecnología de los Alimentos Universidad de León León Spain Departamento de Higiene y Tecnología de los Alimentos Universidad de León León Spain Instituto Tecnológico Superior del Oriente del Estado de Hidalgo Apan Mexico Facultad de Ciencias Químicas Universidad Autónoma de Chihuahua Chihuahua Mexico.

The aim of this study was to describe the compositional, functional and sensory properties of six traditional mexican cheeses: Panela, Oaxaca, manchego, manchego Botanero, Tenate, and morral. A total of 50 cheeses were analysed. Relevant compositional parameters including pH, aw, proximate composition, NaCl, sugars, lactic and acetic acids, mineral contents, free-amino acid nitrogen, fat acid degree value and total fatty acids were determined. In addition, colour and texture profile analyses of unmelted cheeses and their meltability were investigated. Furthermore, other 30 cheeses were used for a descriptive sensory analysis. Properties of cheeses were described, compared between each cheese, and related to their respective making processes.

关键词： Cheese Properties Oaxaca Panela manchego Botanero morral Ethnic Food Tenate Traditional Cheese

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加勒比潜水乐加勒比海最适合潜水的礁石海域

空中英语教室（高级版．彭蒙惠英语） 2023年第9期 34-36,50页

作者： Valentin fuentes 不详

29无论是潜水新手、高手,还是想要在一片全球海洋动植物最多样的区域尽情浮潜的家庭,加勒比海都是绝佳目的地以下是世界各地的潜水者最喜欢的几个地点,可以好好享受加勒比海这个精选海域的水下自然美景。墨西哥科苏梅尔岛这座位于墨西... 详细信息

29无论是潜水新手、高手,还是想要在一片全球海洋动植物最多样的区域尽情浮潜的家庭,加勒比海都是绝佳目的地以下是世界各地的潜水者最喜欢的几个地点,可以好好享受加勒比海这个精选海域的水下自然美景。墨西哥科苏梅尔岛这座位于墨西哥加勒比海、长30英里的岛屿,对于专业潜水员或是想要通过浮潜欣赏海洋生物的游客而言,都堪称天堂。

关键词：自然美景加勒比潜水者潜水员海洋生物墨西哥

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生态建筑设计指南

Facial Asymmetry Correction in Facial Palsy Patients with Silhouette Sutures

作者： (美)Sue Roaf (美)manuel fuentes (美)Stephanie Thomas-Rees

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International Journal of Clinical medicine 2012年第1期3卷 55-59页

作者： maría Luisa Navarrete Ricard Palao Lluisa Torrent Juan Fernando fuentes mireia González 不详

Introduction: over the last few decades several techniques static and dynamics, have been performed to improve facial asymmetry and functionality alter suffering facial paralysis. methods: we present a pilot study to show and evaluate the benefits of a new form of facial suspension, with Silhouette sutures. We performed two patients with total and complete facial palsy due to otical tuberculosis in one case and to parotid carcinoma in the other. Results: one year after surgery, both patients have improved facial asymmetry, mastication and speech production which have lead to a higher self-esteem and major social interaction. Conclusions: static facial suspension with Silhouette sutures is a non invasive alternative to dynamic techniques in patients who don’t want or can’t undergo more complex surgeries.

关键词： Facial Paralysis Suture Suspension Static Technique Silhouette Sutures

A charged star with geometric Karmarkar condition

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Communications in Theoretical Physics 2023年第8期75卷 139-149页

作者： Gabino Estevez-Delgado Joaquin Estevez-Delgado Rafael Soto-Espitia Antonio Rendón Romero Jorge mauricio Paulin-fuentes Facultad de Químico Farmacobiología de la Universidad michoacana de San Nicolás de Hidalgo Facultad de Ciencias Físico matemáticas de la Universidad michoacana de San Nicolás de Hidalgo Edificio BCiudad Universitaria Facultad de Ingeniería Civil de la Universidad michoacana de San Nicolás de Hidalgo Edificio A Ciudad Universitaria Facultad de Ingeniería mecánica de la Universidad michoacana de San Nicolás de Hidalgo Edificio W Ciudad Universitaria División Académica de Ciencias Básicas de la Universidad Juárez Autónoma de Tabasco

In this paper,we analyse an analytical solution of the Einstein–maxwell field equations that considers matter with anisotropic pressures in a static and spherically symmetric *** report the manner in which we obtained the solution,which is by means of the Karmarkar *** the model,we assume a state equation that describes the interaction of matter from quarks P=(c^(2)ρ-4B_(g))/3 and we consider the presence of electric charge,which can generate that the radial and tangential pressures are not *** a graphic manner,we analyse the physical properties of the model,taking as the observational data those of mass 1m⊙and radius7.69 km which were reported for the star Her *** charge values are found between 5.57×10^(18)C≤Q≤1.31×10^(20)C and the interval of the Bag constant Bg∈[118.7,122.13]meV/fm^(3).Also,we show the stability of the configuration by means of the static stability criteria of Harrison–Zeldovich–Novikov((?m)/?ρc>0),as well as in regards to infinitesimal radial adiabatic perturbation,since the adiabatic indexγ>3.3 which guarantees the stability of the solution.

关键词： general relativity exact solutions anisotropic fluid Karmarkar condition

LimnPO<SUB>4</SUB>: Review on Synthesis and Electrochemical Properties

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Journal of materials Science and Chemical Engineering 2015年第5期3卷 54-64页

作者： Joel O. Herrera Héctor Camacho-montes Luis E. fuentes Lorena álvarez-Contreras Universidad Autónoma de Ciudad Juárez Cd. Juárez México Centro de Investigación en materiales Avanzados Chihuahua México

The olivine structured mixed lithium-transition metal phosphates LimPO4 (m = Fe, mn, Co) have attracted tremendous attention of many research teams worldwide as a promising cathode material for lithium batteries and for studying their magnetic and electrical properties. High energy density is required for mind- to large-scale batteries because the mounting spaces are quite small for vehicles and other energy storage applications. This constraint necessitates synthesis to yield high volumetric energy density and reliable battery performance. Development of eco-friendly, low cost and high energy density, LimnPO4 cathode material became attractive due to its high operating voltage, which can be located inside of the electrochemical stability window of conventional electrolyte solutions and it offers more safety features due to the presence of a strong P-O covalent bond. This review is an overview of current research activities on LimnPO4 cathodes and its carbon coating synthesized by various synthetic techniques.

关键词： Synthesis Properties LimnPO4

机械加工高性能工件材料用cBN镀覆切削工具

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磨料磨具通讯 2011年第7期 6-8页

作者： E.Uhlmann J.A.Qyaneddl fuentes m.Keunecke 柏林技术大学机械工具和工厂管理研究所（IWF）德国夫琅和费表面工程和薄膜研究所（IST）德要

0引言机械加工用高性能工件材料如耐高温合金和淬火钢，由于形变能和材料磁阻摩擦力导致塑性形变，产生了高切削力和高温。然而由于这些合金和淬火钢在工业上有很多应用，因此这些材料的机械加工，以及用于这些机械加工的切削工具的相... 详细信息

0引言机械加工用高性能工件材料如耐高温合金和淬火钢，由于形变能和材料磁阻摩擦力导致塑性形变，产生了高切削力和高温。然而由于这些合金和淬火钢在工业上有很多应用，因此这些材料的机械加工，以及用于这些机械加工的切削工具的相关研究意义重大。一方面由于工业上提高生产力的需要，另一方面要降低生产成本，加上环境保护法的严格约束，都激励着研究部门不断地延长工具寿命。之前的研究表明，有一个有效延长工具寿命的方法，就是将切削工具进行镀覆。

关键词：工件材料机械加工切削工具镀覆性能 cBN 耐高温合金工具寿命