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Effects of yttria content on the CMAS infiltration resistance of yttria stabilized thermal barrier coatings system

Journal of Materials Science & Technology 2020年第8期36卷 74-83页

作者： juan jgomez chavez Ravisankar Naraparaju Peter Mechnich Klemens Kelm Uwe Schulz C.V.Ramana University of Texas at El Paso Department of Mechanical EngineeringEl PasoTX79968USA German Aerospace Center(DLR) Institute of Materials ResearchCologne51170Germany

The effects of YO(1.5)doping in yttria-zirconia based thermal barrier coatings(TBCs)against CMAS interaction/infiltration are *** TBCs with an YO(1.5)content ranging from 43–67 mol.%(balance Zr O2)were produced by electron beam physical vapor deposition(EB-PVD)*** results reveal a trend of higher apatite formation probability with the higher free YO(1.5)available in the yttriazirconia ***,the infiltration resistance and amount of consumed coating appears to be strongly dependent on the YO(1.5)content in the *** thinnest reaction layer and lowest infiltration was found for the highest produced 67 YO(1.5)*** XRD experiments with volcanic ash/YO(1.5)powder mixtures with higher yttria contents than in the coatings(80 YO(1.5)and pure YO(1.5))also showed higher apatite formation with respect to increasing yttria *** threshold composition to promote apatite-based reaction products was found to be around 50 YO(1.5)in zirconia which was proved in the coatings and XRD powder *** YO(1.5)-ZrO2-Fe O-TiO2 bearing zirconolite-type phase was formed as a reaction product for all the coating compositions which implicates that TiO2 in the melt acts as a trigger for zirconolite *** phase could be detrimental for CMAS/volcanic ash infiltration resistance since it can be formed alongside with apatite which controls or limits the amount of Y^(3+)available for glass *** Fe rich garnet phase containing all the possible elements exhibited a slower nucleation compared to apatite and its growth was enhanced with slow cooling *** implications of phase stability and heat treatment effects on the reaction products are discussed for tests performed at 1250°C.

关键词： CMAS Volcanic ash Infiltration Electron beam physical vapor deposition Thermal barrier coating

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Fertirrigation with Low-Pressure Multi-Gate Irrigation Systems in Sugarcane Agroecosystems:A Review

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Pedosphere 2019年第1期29卷 1-11页

作者： Arturo GARCIA-SALDANA Cesareo LANDEROS-SANCHEZ Maria del Refugio CASTANEDA-chavez juan Pablo MARTINEZ-DAVILA Arturo PEREZ-VAZQUEZ Eugenio CARRILLO-AVILA Postgraduate College Campus Veracruz Tepetates C.P.91674(Mexico) Technological Institute of Boca del Rio(ITBOCA) Boca del Rio C.P.94290(Mexico) Postgraduate College Campus Campeche Campeche C.P.24450(Mexico)

There are very few studies on the application of fertilizers through irrigation water(fertirrigation) using a multi-gate irrigation system in sugarcane AES. Through fertirrigation, the application of fertilizers can be simplified, and their distribution uniformity in sugarcane fields improved. This paper provides an overview of the state of the art regarding fertirrigation with multi-gate irrigation in sugarcane agroecosystems(AES). In order to systematize, organize, and discuss the scientific data on fertirrigation with low-pressure multi-gate irrigation systems in sugarcane AES, bibliographic material from the following full-text scientific journal databases was screened: the Elsevier Science Direct Freedom Collection, Springer Link, and the International Society for Horticultural Science. Next,a matrix of keywords was used to analyze the interrelationships among the available literature, current issues, and the recent *** conclude that development of fertirrigation technologies with low-pressure multi-gate irrigation is much needed.

关键词： climate change crop water requirement fertilizer application fertilizer distribution uniformity sugarcane industry water use efficiency

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Characterization of Chemical Bath Deposited CdS, CdSe and PbS

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材料科学与工程（中英文A版） 2011年第5X期1卷 692-704页

作者： Oscar Portillo Moreno Gustavo Abarca Avila Jorge R. Cerna juan Hernandez Tecorralco Melissa chavez Portillo Javier Martinez Juarez Rosendo Lozada Morales Orlando Zelaya Angel Facultad de Ciencias Quimicas Benemerita Universidad Autonoma de Puebla Mexico Col. Sn. Manuel Puebla Pue. Mexico CIDS-ICUAP Benemerita Universidad Autonoma de Puebla Mexico. Col. Sn. Manuel Puebla Pue. Mexico Fac. Ciencias Fisicomatematicas Postgrado en Optoelectronica Benemerita Universidad Autonoma de Puebla Mexico Col. Sn Manuel Puebla Pue. Mexico Departamento de Fisica Centro de Investigacion y de Estudios de Estudios Avanzados del IPN 07360 Mexico D. F. Mexico

CdS, CdSe and PbS films were grown onto glass by chemical bath deposition (CBD). Different constant deposition temperatures (Td) were employed in the range 0-80 °C with subintervals of 10 °C. Concentration of reagents, pH, and stirring were maintained constants. A microcrystalline mixture CdCO3 and CdS were grown. At intermediates Td values a mixture of both materials present. i. e., For Td? 40 °C, the intensity of the main of X-ray Diffraction (XRD) CdS peak is abruptly reduced. By scanning electronic microscopy (SEM) with Td = 80 °C, concentration atomic: Cd = 49.10, S = 51.90, for Td? 70 °C, increase of carbon and oxygen. The CdSe, average grain size (GS) increased monotonic with Td, reaching saturation of 70 °C, with GS values of 5-16 nm. At low Td values (0-20 °C), the structural phase was found, and the high Td = 70 °C on material 5-16 nm was appreciated transition to phase: Wurzite (W)? Zinbclende (ZB) and phases mixture: W/ZB, grain size (GS) 9-27 nm. By (XRD), PbS grow in W phase at all films, for Td = 60 °C, was observed preferential orientation in plane [111] with (GS) of 19-26 nm also a Gibbs free energy calculation is included.

关键词： CdSe 化学浴沉积 PBS 平均晶粒尺寸扫描电子显微镜表征吉布斯自由能薄膜生长

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Investigation of Chemical Bath Deposition of ZnO Nanocrystals Thin Films Using Different ZnNO3 Concentration

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材料科学与工程（中英文A版） 2012年第5期2卷 442-453页

作者： Miguel Hemandez Hernandez Martin Lazcano Hernendez juan Hernandez Tecorralcol Gabriel Juarez Diaz Melissa chavez Portillo Salvador Rosas Castilla L. Chaltel Lima Oscar Portillo Moreno Facultad de Ciencias Quimicas Benemerita Universidad Autonoma de Puebla Moxico Puebla Mexico CIDS-ICUAP Benemerita Universidad A utonoma de Puebla Moxico

In this work, thin films growth at different ZnNO3 concentrations: 0.02 M, 0.03 M and 0.04 M by chemical bath deposition (CBD) as-prepared on glass substrates at 80 °C ± 2 °C. Patterns Diffraction x-ray (DRX) shown peaks 2θ = (31.72, 32.769, 34.36, 36.10, 47.44, 56.52, 62.78, 67.84 and 69.02), at concentration 0.02 M show formation from hydrozincite [Zn5(CO3)2(OH)6]. The optical band gap shifts from 3.8 eV to 3.6 eV. Photoluminescence (PL) spectra show intensity variation of the green emission (GE) may be resulted from variation of the intrinsic defect in ZnO films, such zinc vacancy (VZn), oxygen vacancy (VO), and interstitial zinc (Zni), interstitial oxygen (Oi). The presence of defects in our samples is responsible for the observed broad visible PL bands; this indicates reductions of oxygen vacancies and increase of oxygen interstitials. It could be believed that the presence of defects in samples is responsible for the observed broad visible PL band. The concentration increased the visible defect luminescence, which might be due to improvement to sample stoichiometric. The presence of both green emission (GE) and yellow emission (YE) can be seen through the deconvolution of the defect increasing the concentration, the position of the GE shifted from 1.96-2.45 eV and the increase of its intensity. The shifts of these two visible PL bands might be due to changes in local environments of the defects centers in samples due to increased concentration. Therefore, the GE relate to donor levels dominated due to increase of oxygen vacancies. ZnO is an n-type semiconductor and it means that most defects are Zn interstitials and oxygen vacancies. Raman spectra showed increase of the 437 cm-1 (E2 mode) peak intensity due concentration 0.4 M.

关键词： ZnO薄膜 O3浓度化学浴沉积纳米晶薄膜慢性粒细胞白血病缺陷中心绿色发光强度变化

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Kinetics and thermodynamic studies of Methyl Orange removal by polyvinylidene fluoride-PEDOT mats

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Journal of Environmental Sciences 2021年第2期33卷 62-73页

作者： Romario J.da Silva Lizeth Carolina Mojica-Sanchez Filipe D.S.Gorza Graciela C.Pedro Bruna G.Maciel Gabriela P.Ratkovski Herica D.daRocha Kamila T.O.do Nascimento juan CMedina-Llamas Alicia E.chavez-Guajardo Jose J.Alcaraz-Espinoza Celso P.de Melo Program a de Pos-Graduagao em Ciencia de Materials U niversidade Federal de Pernambuco50670-901 RecifePEBrazil Departamento de Ffsica Uniuersidade Federal de Pemambiico50670-901 Reci/ePEBrazil Centro de Estudios Cientificosy Tecnologicos No.18 Instituto Politecnico Nacional98160 ZacatecasZacMexico Unidad Academica de Ciencias de la Tierra Uniuersidad Aut6noma de Zacatecas98058 ZacatecasZacMexico Departamento de Quimica Universidad Autonoma Metropolitana09340Ciudad de MexicoMexico

We report the preparation of poly(3,4-ethylene dioxythiophene)(PEDOT)-modified polyvinylidene fluoride electrospun fibers and their use as a novel adsorbent material for the removal of the anionic dye Methyl Orange(MO)from aqueous *** novel adsorbent material can be used to selectively remove MO on a wide p H range(3.0-10.0),with a maximum capacity of 143.8 mg/g at p H *** used in a recirculating filtration system,the maximum absorption capacity was reached in a shorter time(20 min)than that observed for batch mode experiments(360 min).Based on the analyses of the kinetics and adsorption isotherm data,one can conclude that the predominant mechanism of interaction between the membrane and the dissolved dye molecules is ***,considering the estimated values for the Gibbs energy,and entropy and enthalpy changes,it was established that the adsorption process is spontaneous and occurs in an endothermic *** good mechanical and environmental stability of these membranes allowed their use in at least 20 consecutive adsorption/desorption cycles,without significant loss of their *** suggest that the physical-chemical characteristics of PEDOT make these hybrid mats a promising adsorbent material for use in water remediation protocols and effluent treatment systems.

关键词： Electrospinning Composite mats Pedot Pvdf mats Dye removal Water remediation

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Nitric oxide production is associated to increased lipoperoxidation and active caspase-3 in demyelinated brain regions of the taiep rat

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Advances in Bioscience and Biotechnology 2012年第6期3卷 695-704页

作者： Guadalupe Soto-Rodríguez Daniel Martínez-Fong Rosa Arroyo Patricia Aguilar-Alonso Hector Rubio José Ramón Eguibar Araceli Ugarte Maricela Torres-Soto juan Antonio González-Barrios Jorge Cebada Eduardo Brambila Bertha Alicia Leon-chavez Departamento de Fisiología Biofísica y Neurociencias Cinvestav Apdo. Postal 14-740 México D.F. 07000 México División de Medicina Genómica del Hospital regional 1o de Octubre ISSSTE Avenida Instituto Politécnico Nacional 1669 México D. F. 07760 México Escuela de Biología BUAP Puebla Pue. Mexico Facultad de Ciencias Químicas BUAP 14 sur y Av. Edif. 138 San Claudio 72570 Puebla Pue. México Facultad de Medicina Universidad Autónoma de Yucatán Mexico Instituto de Fisiología BUAP 14 sur 6301 Puebla Pue. México

We previously showed that the increase in nitric oxide (NO) levels and NO synthase (NOS) expression correlate with the progression of reactive astrocytosis and demyelination in the brains of 6-month-old taiep rats. Increased levels of NO can result in high concentration of peroxynitrite and thus cause tissue damage, which consists of lipoperoxidation of the cytoplasmic membrane, such as the myelin, and of apoptotic and necrotic cell-death. On this basis, we studied whether the increased NO production is associated with lipoperoxidation and cell death in the cerebellum and brainstem over the age (1, 3, 6, and 8 months) of taiep rats. The results were compared with those obtained in matched Sprague-Dawley (SD) rats. We measured the levels of nitrites (NO production), malonyldialdehyde, and 4-hydroxyalkenal (lipoperoxidation) in brain tissue homogenates. The three NOS isoforms and cleaved caspase-3 were evaluated by using ELISA and immunostaining techniques. Our results showed that NO production and lipoperoxidation increased in the cerebellum and brainstem as the age of the taiep rats increased compared to SD rats. The overexpression of nNOS and iNOS were in the Purkinje cells, magnocellular neurons, and in oligodendrocytes, whereas the glial cells showed strong cleaved-caspase-3 immunoreactivity. In summary our results suggest that NO plays a role in the demyelination and cell death in the taiep rat.

关键词： Hypomyelination Nitrite Malonyldialdehyde Apoptosis Necrosis

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Botulinum Toxin A, Effect on Tensile Strength of Skin Wounds;Animal Study

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Journal of Biosciences and Medicines 2020年第2期8卷 17-24页

作者： Carlos A. Gonzalez-Alvarado juan Garzon-Muvdi Roxanna Perez-Garmendia Victoria Ramirez Luz Graciela Cervantes Adriana Rodriguez-Gomez Rodrigo Davila-Diaz Cuahutemoc Marquez-Espriella Plastic and Reconstructive Surgery Division Hospital Central Sur de alta Especialidad de Petroleos Mexicanos Mexico City Mexico Experimental Surgery Department Instituto Nacional de Ciencias Medicas y Nutrición Salvador Zubiran Mexico City Mexico Pharmacology Department Instituto Nacional de Cardiologia Ignacio chavez Mexico City Mexico Pathology Department Hospital Angeles del Pedregal Mexico City Mexico

Wound healing and cicatrization is a process that involves several phases. The main goal of a surgeon and specially the plastic surgeon is to achieve the best cosmetic results and avoid complications. Several tools are available to achieve the best result. One of the tools recently studied is the use of Botulinum toxin. The use of Botulinum toxin has showed to be a useful aid by improving macroscopic cosmetic changes, as histopathologic ones. The increase of the tensile strength is also one of the positive changes that come with the use of botulinum toxin.

关键词： Botulinum Toxin Wound Tensile Strength

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Congenitally Corrected Transposition of the Great Arteries: Conduction Anomalies: A Case Report

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World Journal of Cardiovascular Diseases 2021年第9期11卷 439-444页

作者： Jose Antonio Luna-Alvarez-Amezquita Javier Ivan Armenta-Moreno Joaquin Berarducci Jorge Luis Bermudez-Gonzalez Jose Luis Siller-Nava Edson Alberto Escandón-Villalobos Nilda Espinola-Zavaleta Roberto Cano-Zarate juan Ignacio Straface Department of Nuclear Cardiology National Institute of Cardiology Ignacio Chavez Mexico City Mexico Department of Echocardiography ABC Medical Center I.A.P. Mexico City Mexico Department of Magnetic Resonance National Institute of Cardiology Ignacio Chavez Mexico City Mexico

Introduction: Congenitally corrected transposition of the great arteries (CCTGA) is a rare heart disease that encompasses an atrioventricular and ventriculoarterial discordance and accounts for less than 1 percent of congenital heart diseases. Objective: To present an atypical case of a man with complex congenital heart disease and conduction anomalies. Case Presentation: This is a case of a 34-year-old patient who came to the hospital with 1 week of dyspnea on exertion and episodes of lipothymia. The patient was referred to our hospital after an electrocardiogram from his primary care with evidence of blocked atrial fibrillation. During the initial evaluation blocked atrial fibrillation was confirmed with a rescue ventricular rate of 38 bpm. A magnetic resonance confirmed the presence of the atrioventricular and ventriculoarterial discordance, the aorta had a left anterior position, perimembranous ventricular septal defect with a right to left shunt, biventricular systolic dysfunction, moderate tricuspid, and mitral regurgitation, interventricular septal intramyocardial and biatrial fibrosis, left atrial dilation, and dilation of the pulmonary artery. After pacemaker placement, the patient has an improvement in his clinical symptoms and quality of life. Conclusions: Cardiac arrhythmias are CCTGA’s leading cause of death, mostly ventricular tachycardia, and atrial fibrillation. Right bundle branch block is a previously unreported and potentially very rare presentati

关键词： Congenital Heart Disease Congenitally Corrected Transposition of the Great Arteries Cardiac Magnetic Resonance Echocardiography Arrhythmia

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Comparative study of breast cancer in Mexican and Mexican-American women

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Health 2010年第9期2卷 1040-1048页

作者： Maria Elena Martinez Luis Enrique Gutierrez-Millan Melissa Bondy Adrian Daneri-Navarro Maria Mercedes Meza-Montenegro Ivan Anduro-Corona Ma Isabel Aramburo-Rubio Luz Maria Adriana Balderas-Pena Jose Adelfo Barragan-Ruiz Abenaa Brewster Graciela Caire-Juvera juan Manuel Castro-Cervantes Mario Alberto chavez Zamudio Giovanna Cruz Alicia Del Toro-Arreola Mary EEdgerton Maria Rosa Flores-Marquez Ramon Antonio Franco-Topete Helga Garcia Susan Andrea Gutierrez-Rubio Karin Hahn Luz Margarita Jimenez-Perez Ian KKomenaka Zoila Areli Lopez Bujanda Dihui Lu Gilberto Morgan-Villela James LMurray Jesse NNodora Antonio Oceguera-Villanueva Miguel Angel Ortiz Martinez Laura Perez Michel Antonio Quintero-Ramos Aysegul Sahin Jeong Yun Shim Maureen Stewart Gonzalo Vazquez-Camacho Betsy Wertheim Rachel Zenuk Patricia Thompson Arizona Cancer Center and Mel and Enid Zuckerman College of Public Health University of ArizonaTucsonUSA Departamento de Investigaciones Cientificas y Tecnologicas Universidad de SonoraHermosilloMexico University of Texas M.D.Anderson Cancer Center HoustonUSA Departamento de Fisiologia Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajaraMexico Instituto Tecnologico de Sonora Ciudad ObregónMexico Instituto Mexicano del Seguro Social HermosilloMexico Instituto Mexicano del Seguro Social CMNOGuadalajaraJalisco Centro de Investigacion en Alimentacion y Desarrollo HermosilloMexico Instituto Mexicano del Seguro Social Ciudad ObregonMexico OPD Hospital Civil de Guadalajara GuadalajaraMexico Departamento de Salud Publica Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajaraMexico Maricopa Medical Center Department of SurgeryPhoenixUSA University of North Carolina Lineberger Cancer CenterChapel HillUSA Arizona Cancer Center and Department of Family and Community Medicine University of ArizonaTucsonUSA Instituto Jalisciense de Cancerologia GuadalajaraMexico

Breast cancer is the number one cause of can- cer deaths among Hispanic women in the United States, and in Mexico, it recently became the primary cause of cancer deaths. This malign- nancy represents a poorly understood and un- derstudied disease in Hispanic women. The ELLA Binational Breast Cancer Study was es- tablished in 2006 as a multi-center study to as- sess patterns of breast tumor markers, clinical characteristics, and their risk factors in women of Mexican descent. We describe the design and implementation of the ELLA Study and provide a risk factor comparison between women in the U.S. and those in Mexico based on a sample of 765 patients (364 in the U.S. and 401 in Mexico). Compared to women in Mexico, U.S. women had significantly (p < 0.05) lower parity (3.2 vs. 3.9 mean live births) and breastfeeding rates (57.5% vs. 80.5%), higher use of oral contraceptives (60.7% vs. 50.1%) and hormone replacement therapy (23.3% vs. 7.6%), and higher family history of breast cancer (15.7% vs. 9.0%). Re- sults show that differences in breast cancer risk factor patterns exist between Mexico and U.S. women. We provide lessons learned from the conduct of our study. Binational studies are an important step in understanding disease pat- terns and etiology for women in both countries.

关键词： Binational Study Breast Cancer Hispanics Mexico United States

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Interferon Regulatory Factor 5 and Renin-Angiotensin-Aldosterone System Polymorphisms in Coronary Artery Disease: An Overview of Experimental and Clinical Studies

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World Journal of Cardiovascular Diseases 2021年第7期11卷 332-341页

作者： Jorge Luis Bermudez-Gonzalez Rodrigo Dagio-Cuellar Cristina Villarreal-Guerrero Ana Gilabert-Garcia Luis Angel Ferral-Barbabosa Joaquin Berarducci Jose Luis Siller-Nava Jose Antonio Luna-Alvarez-Amezquita Javier Iván Armenta-Moreno Nilda Espínola-Zavaleta Erick Alexanderson-Rosas juan Ignacio Straface National Institute of Cardiology Ignacio chavez Mexico City Mexico Medicine Faculty of National Autonomous University of Mexico Mexico City Mexico

Heart diseases are the main cause of mortality in Mexico, being coronary heart disease the most frequent in the country. Its high prevalence makes important the study of the pathophysiology and the search for prognostic factors. Different genes and polymorphisms promote atherogenesis and coronary artery disease, they affect inflammatory and vascular pathological processes. Interferon regulatory factor 5 (IRF5) is associated with coronary heart disease, it promotes chronic inflammation and cytokines release;it could trigger immune reactions and its activating receptors express in the vascular endothelium. Besides, polymorphisms in the renin-angiotensin-aldosterone system (RAAS) are implied with coronary disease, they are found in angiotensinogen (AGT), angiotensin II type 1 receptor (AT1R), angiotensin II type 2 receptor (AT2R), and angiotensin-converting enzyme (ACE) genes. These genetic polymorphisms are associated with a prothrombotic state, endothelial dysfunction, and immune activation. Multiple experimental studies showed that chronic activation of RAAS and chronic expression of IRF5 generates an environment prone to the development of atherosclerosis, and autoimmune and cardiovascular diseases. Studying these specific genes and their relationship with coronary heart disease will allow a better understanding of the pathological process and possibly the quest for new treatments.

关键词： Interferon Regulatory Factor 5 (IRF5) Angiotensin-Converting Enzyme (ACE) Angiotensinogen (AGT) Angiotensin II Type 1 Receptor (AT1R) Angiotensin II Type 2 Receptor (AT2R) Polymorphisms

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