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Applied Mathematics and Mechanics(english edition) 2018年第5期39卷 667-684页

作者： M.PeRALTA O.BAUTISTA F.MeNdeZ e.BAUTISTA seccion de estudios de posgrado e investigacion eSIMe Azcapotzalco Instituto Politecnico NacionalCiudad de Mexico 02250Mexico Facultad de Ingeniería Universidad Nacional Autonoma de MexicoCiudad de Mexico 04510Mexico

The pulsatile electroosmotic flow （PeOF） of a Maxwell fluid in a parallel flat plate microchannel with asymmetric wall zeta potentials is theoretically analyzed. By combining the linear Maxwell viscoelastic model, the Cauchy equation, and the electric field solution obtained from the linearized PoissomBoltzmann equation, a hyperbolic par- tial differential equation is obtained to derive the flow field. The PeOF is controlled by the angular Reynolds number, the ratio of the zeta potentials of the microchannel walls, the electrokinetic parameter, and the elasticity number. The main results obtained from this analysis show strong oscillations in the velocity profiles when the values of the elas- ticity number and the angular Reynolds number increase due to the competition among the elastic, viscous, inertial, and electric forces in the flow.

关键词： pulsatile electroosmotic flow (PeOF) flat plate microchannel asymmetric zeta potential Maxwell fluid

effects of estrogen receptor modulators on cytoskeletal proteins in the central nervous system

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Neural Regeneration Research 2017年第8期12卷 1231-1240页

作者： Julia J.Segura-Uribe Rodolfo Pinto-Almazán Angélica Coyoy-Salgado Claudia e.Fuentes-Venado Christian Guerra-Araiza Unidad de investigacion Modica en enfermedades Neurologicas Hospital de Especialidades Centro Medico Nacional Siglo XXI Instituto Mexicano del Seguro Social Mexico City Mexico seccion de estudios de posgrado e investigacion Escuela Superior de Medicina Instituto Politecnico Nacional Mexico City Mexico Unidad de investigacion Hospital Regional de Alta especialidad Ixtapaluca Ixtapaluca Mexico Institute for the developing Mind Children's Hospital Los Angeles Los Angeles CA USA department of Pediatrics Keck School of Medicine University of Southern California Los Angeles CA USA Consejo Nacional de Ciencia y Tecnologia Mexico City Mexico Clinica de Trastornos del Sueno Universidad Autonoma Metropolitana-Iztapalapa Mexico City Mexico Servicio de Medicina Fisica y Rehabilitacion Hospital General de Zona No. 197 Texcoco Mexico Unidad de investigacion Modica en Farmacologla Hospital de Especialidades Centro Medico Nacional Siglo XXI Instituto Mexicano del Seguro Social Mexico City Mexico

estrogen receptor modulators are compounds of interest because of their estrogenic agonistic/antagonistic effects and tissue specificity. These compounds have many clinical applications, particularly for breast cancer treatment and osteoporosis in postmenopausal women, as well as for the treatment of climacteric symptoms. Similar to estrogens, neuroprotective effects of estrogen receptor modulators have been described in different models. However, the mechanisms of action of these compounds in the central nervous system have not been fully described. We conducted a systematic search to investigate the effects of estrogen receptor modulators in the central nervous system, focusing on the modulation of cytoskeletal proteins. We found that raloxifene, tamoxifen, and tibolone modulate some cytoskeletal proteins such as tau, microtuble-associated protein 1（MAP1）, MAP2, neurofilament 38（NF38） by different mechanisms of action and at different levels： neuronal microfilaments, intermediate filaments, and microtubule-associated proteins. Finally, we emphasize the importance of the study of these compounds in the treatment of neurodegenerative diseases since they present the benefits of estrogens without their side effects.

关键词： estrogen receptor modulators selective estrogen receptor modulators microtubules neurofilaments tibolone tamoxifen raloxifene

Non-linear modeling of kinetic and equilibrium data for the adsorption of hexavalent chromium by carbon nanomaterials:Dimension and functionalization

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Chinese Journal of Chemical engineering 2019年第4期27卷 912-919页

作者： Miguel de la Luz-Asunción eduardo e.Pérez-Ramírez Ana L.Martínez-Hernández Victor M.Castano Víctor Sánchez-Mendieta Carlos Velasco-Santos Facultad de Quimica Universidad Autonoma del Estado de Mexico Km. 12 de la carretera Toluca-Atlacomulco C.P. 50200 San Cayetano Toluca Estado de Mexico Mexico Tecnologico Nacional de Mexico-Instituto Tecnologico de Queretaro Division de Estudios de Posgrado e Investigacion Av. Tecnologico s/n esq. GraL Mariano Escobedo Col. Centro Historico C.P. 76000 Santiago de Queretaro Queretaro Mexico Centro de Fisica Aplicada y Tecnologia Avanzada Universidad Nacional Autonoma de Mexico Boulevard Juriquilla 3001 Queretaro 76230 Mexico

The adsorption capacities for the removal of hexavalent chromium from aqueous solutions by six carbon nanomaterials have been evaluated. Single-walled and multi-walled carbon nanotubes as received and after oxidation treatment, graphene oxide and reduced graphene oxide are the materials with different dimension and functionalization compared in this research. Carbon nanotubes have been modified using hydrogen peroxide as oxidizing agent under microwave radiation. The oxidation treatment on carbon nanotubes has a positive effect increasing the adsorbent–adsorbate interaction. Rate-controlling mechanisms and equilibrium data are analyzed using non-linear models. Non-linear method is proposed as the most suitable method for determining the kinetic and equilibrium parameters. The values of adsorption energy(e) obtained from the Dubinin–Radushkevich isotherm,have been found around 0.371 and 0.870 k J·mol-1, indicating physical adsorption. Therefore, the pseudo-second order model represents better the kinetic experimental data. The results show that the Langmuir isotherm provides a slightly better fit to the experimental data compared with the Freundlich isotherm, indicating homogeneous distribution of active sites on carbon nanomaterials and monolayer adsorption. The separation factors RLare found in the range of 0–1, suggesting that the adsorption process is suitable for all adsorbents. The mechanisms for hexavalent chromium removal have been proposed as electrostatic interactions and hydrogen bonding.

关键词： Carbon nanotubes Graphene Adsorption Hexavalent chromium Kinetic

Fracture Mechanics on Aluminum Specimens

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World Journal of Mechanics 2021年第12期11卷 237-257页

作者： Juan Jose Mejia Briseno Francisco Casanova-del-Angel Tecnologico Nacional de Mexico Instituto Tecnol&#243 gico de Pachuca Pachuca Estado de Hidalgo Mexico seccion de estudios de posgrado e Investigació n Escuela Superior de Ingenier&#237 a y Arquitectura Unit. Adolfo Lopez Mateos Instituto Polit&#233 cnico Nacional Ciudad de M&#233 xico Mexico

ASTM standards for A413 aluminum alloy specimen assays were used based on standard e399-05, with a minimum requirement of three specimens. Linear elastic fracture mechanic testing was carried out in plane strain conditions and fracture toughness of the tested aluminum, critical stress intensity factor was determined. Four specimens with the selected geometry were made, since in the pre-cracking process a non-acceptable propagation of crack may be present, em>i.e.em>, the crack does not propagate in a parabolic manner. In like manner, the Type Se (B) specimen, that is, a beam subject to bending under a monotonic load, was used. Stress efforts were induced in the experiment, the load mode for such experiments is mode I, determining a temporary value of the KQ apparent stress intensity factor. When such value complies with the validity criteria of e-399 Standard, it becomes the stress intensity factor KIC of material.

关键词： Metallography A413 Aluminum Fracture Mechanics Stress efforts Fractography

^13C-Nuclear Magnetic Resonance （experimental and Theorical） and FTIR of Interpenetrating Polymer Networks Based in PolyurethanelPolyaniline （PU/PANI）

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材料科学与工程（中英文版） 2010年第1期4卷 45-50页

作者： Norma-Aurea Rangel-Vaizquez Rene Salgado-delgado edgar Garcia-Hernandez Ana MariaMendoza-Martinez Mario Alejandro Gomez-Jimenez departamento de Metalmecanica del Instituto Tecnologico de Queretaro. Ave. Tecnologico esq. Mariano escobedo S/N Col Centro CP 76000 Querdtaro Qro. Mexico Division de estudios de posgrado e investigacion del Instituto Tecnologico de Zacatepec. Calzada Instituto Tecnologico Num. 27 Col. Ampliacion Plan de Ayala CP. 62780 Zacatepec Morelos Mexico Division de estudios de posgrado e investigacion del Instituto Tecnologico de Ciudad Madero. Juventino Rosas y Jesus Urueta S/N Col. Los Mangos CP. 89440 Ciudad Madero Tamaulipas Mexico

Households as Sources Contributing the Most to Urban Solid Wastes Production:Implications for a Better Management and Disposal

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Journal of environmental Protection 2019年第8期10卷 1072-1084页

作者： Otoniel Buenrostro delgado Maria del Consuelo Hernandez Berriel Ivan Yassmany Hernandez Paniagua Maria del Consuelo Manon Salas Instituto de investigaciones en Ciencias de la Tierra Universidad Michoacana de San Nicolas de HidalgoCiudad UniversitariaMoreliaMexico Sociedad Mexicana de Ciencia y Tecnologia Aplicada a los Residuos Solidos A.C.(SOMERS)Ciudad de MexicoMexico Tecnologico Nacional de Mexico Instituto Tecnologico de TolucaDivision de Estudios de Posgrado e InvestigacionMetepecMexico CONACYT-Consorcio CeNTROMeT QueretaroMexico

Households are the sources contributing the most to the production of urban solid wastes in developing countries. The present study analyses the generation of domestic solid wastes in a settlement in Mexico in two different years. The goals were to compare composition and rates of generation into the periods to assess changes and the influence of socioeconomic variables. In 1998 and 2004, wastes from households were sampled of three socioeconomic levels randomly selected, and a survey was applied. Data obtained were analyzed with descriptive and multivariate analysis. Results of generation rate and composition of domestic solid wastes showed a negative correlation between generation and income in the first one, but positive in the second one;in both, composition did not show correlation. Rates of per capita generation, per household, population and density of inhabitants per dwelling increased, and the generation of wastes were more with respect to population growth, which emphasizes the influence of economic and demographic variables. This study corroborates that households are the principal sources of urban solid wastes and it is emphasized that management strategies must preponderate households to be successful. In addition, this information is important to establish strategies for an integral management of urban solid wastes in developing countries.

关键词： Waste Dwellings Management Recycling Survey

Obtaining Bioethanol through Hydrolytic Treatment of Agro-Industrial Banana Residues

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Journal of Agricultural Chemistry and environment 2018年第1期7卷 60-72页

作者： Juan C.Sánchez-Acuna Mildred M.Granados-Gómez Luisa F.Navarrete-Rodríguez Jesús G.Rangel-Peraza Yaneth A.Bustos-Terrones Grupo de Investigación Tecnoambiental Facultad de Ingeniería Universidad Libre Sede Bosque Popular Bogotá Colombia CONACYT-División de estudios de posgrado e Investigación Instituto Tecnológico de Culiacán Juan de Dios Batíz 310 Col. Guadalupe Culiacán Sinaloa México

The banana is a food of great importance and it is consumed in almost the entire world. However, its harvest generates large quantities of mostly lignocellulosic waste, which can be used for the production of biofuels such as bioethanol. In this work, the potential for bioethanol production from agro-industrial plantain crop residues was evaluated with different operating conditions. A 24?experimental design was used, having as study variables: time of hydrolysis, pH of hydrolysis, concentration time, and fermentation time. The samples used were scraps consisting of a mixture of stems, leaves, and banana peels. The bioethanol obtained was characterized by physicochemical properties such as density, refractive index, and FTIR. As a result, it was obtained that the volume of bioethanol represented higher yields;using NaOH as a hydrolyzing agent, with hydrolysis time of 30 minutes, high fermentation time, and low concentrations. The chemical characterization of banana agro-industrial waste indicated that, the raw material could be considered as a potential source for bioethanol production, since it has a high content of cellulose.

关键词： Hydrolysis Lignocellulosic Waste Banana Bioethanol experimental design

Cortical columns(barrels)display normal size in the brain’s primary somatosensory cortex of mice carrying null mutations of the insulin receptor substrate 1 gene:A preliminary report

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Advances in Bioscience and Biotechnology 2013年第10期4卷 945-948页

作者： Marta Lopez-Santibanez Guevara eileen Uribe-Querol Alma Lilia Fuentes Farias esperanza Melendez-Herrera Agustine Joseph D’ercole Gabriel Gutierrez-Ospina departamento de Biologia Celular y Fisiologia Instituto de Investigaciones BiomedicasUniversidad Nacional Autonoma de MexicoMexico D.F.Mexico Division de estudios de posgrado e investigacion Facultad de OdontologiaUniversidad Nacional Autonoma de MexicoMexico D.F.Mexico departamento de Zoologia Instituto de Investigaciones sobre los Recursos NaturalesUniversidad Michoacana de San Nicolas de HidalgoMoreliaMexico department of Pediatrics The University of North Carolina at Chapel HillChapel HillUSA Coordinacion de Psicofisiologia Facultad de PsicologiaUniversidad Nacional Autonoma de MexicoMexico D.F.Mexico

Circuits in barrels of the rodent brain’s primary somatosensory (S1) cortex build up following constructivist rules. Previous evidence in mice supports that the precise addition of barrel neuropil is promoted by insulin-like growth factor-1 (IGF-1). The signaling cascades mediating this response remain undetermined. To address whether the effects of IGF-1 upon the growth of S1 circuits are mediated by insulin receptor substrate-1 (IRS-1), we studied barrel size in adult mice having the IRS-1 gene knocked out (IRS-1 ko). Our results reveal that barrel size is similar between wild type and IRS-1 ko mice suggesting that IRS-1 is not essential for barrel circuitry growth. Hence, investigations aimed at exploring other substrates activated by IGF-1, namely IRS-2 and IRS-4, are needed to reveal signaling pathways that mediate the precise addition of S1 neuronal circuitry.

关键词： Barrel Cortex Neuronal Circuit Assemblage Trophic Interactions Constructivism

Physico-Chemical Features and Catalytic Activity of ZrO2-MoO3

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材料科学与工程（中英文版） 2010年第9期4卷 1-9页

作者： Hernandez Juan Garcia Luz Cortez Luz Garcia Ricardo Handy Brent Cairdenas Maria Cueto Arturo Instituto Politecnico Nacional Escuela Superior de Ingenieria Textil Av. lnstituto Politecnico Nacional S/N Edificio # 8 Col. Linda Vista Mexico D.F. 07738. Mexico Instituto Tecnologico de Cd. Madero Division de Estudios de Posgrado e Investigacion Cd. Madero Tam. 89440 Mexico CIeP Facultad de Ciencias Qulmicas Universidad Aut6noma de San Luis Potosi San Luis Potosl 78210 Mdxico Universidad Autonoma Metropolitana-Azcapotzalco Av. San Pablo #180 Col. Reynosa Tamaulipas Delegacin Azcapotzalco Mexico D.F. 02200 oMexico