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Microstructural and photocatalytic characterization of cement-paste sol-gel synthesized titanium dioxide

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Frontiers of Structural and Civil Engineering 2016年第2期10卷 189-197页

作者： elena cerro-PRADA Miguel MANSO Vicente TORRES Jesfs SORIANO Civil Engineering Department Universidad Politecnica de Madrid Alfonso XII 3 Madrid 28014 Spain Applied Physics Department Universidad Aut6noma de Madrid Ciudad Universitaria de Cantoblanco Madrid 28049 Spain Laboratory of Materials CEDEX Ministerio de Fomento de Espana Alfonso XIL Madrid 28014 Spain

ABSTRACT A routte for the in paste synthesis of TiO2 loaded cement is described. TiO2 sols are blended with fresh cement paste as an alternative process to add photocatalytic functionality to cement. The modification of cement paste structure after the addition ofTiO2 sols is analyzed by XRD, SEM and TGA. As a particular microstructural feature, TiO2 containing calcium silicate hydrate （C-H-S） particles are identified as networking centers ofa C-S-H gel fiber matrix. The increase of the TiO2 sol concentration induces a decrease of pore size and an increase in the specific surface area in the cement composites. The photocatalytic activity of the TiO2/cement system is evaluated from the degradation of Methylene Blue （MB） under UV irradiation, monitored through the absorbance at 665 nm. The results show that, although TiO2 phases reveal no long range order structure, the cement paste exothermal treatment in presence of hydrate products and alkaline conditions leads to a photocatalytic composite. Such new cement matrix may be twofold advantageous since it additionally promotes the formation of C-S-H gel, main determinant of cement mechanical properties.

关键词： cement composites photocatalytic TiO2 sol-gel C-S-H gel microstructure

One-step random-walk process of nanoparticles in cement-based materials

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Journal of Central South University 2021年第6期28卷 1679-1691页

作者： Ali BAHARI Aref SADEGHI-NIK elena cerro-PRADA Adel SADEGHI-NIK Mandana ROODBARI Yan ZHUGE Department of Physics University of MazandaranBabolsarIran Young Researchers and Elite Club Sari BranchIslamic Azad UniversitySariIran Department of Civil Engineering Universidad Politécnica de MadridMadridSpain Department of Civil Engineering University of South AustraliaAdelaideAustralia

Efficient modelling approaches capable of predicting the behavior and effects of nanoparticles in cement-based materials are required for conducting relevant *** the microstructural characterization of a cement-nanoparticle system,this paper investigates the potential of cell-based weighted random-walk method to establish statistically significant relationships between chemical bonding and diffusion processes of nanoparticles within cement ***_(0.5)C_(0.5)O_(3)(LSCO)nanoparticles were employed to develop a discrete event system that accounts for the behavior of individual cells where nanoparticles and cement components were expected to *** stochastic model is based on annihilation(loss)and creation(gain)of a bond in the *** model considers both chemical reactions and transport mechanism of nanoparticles from cementitious cells,along with cement hydration *** approach may be useful for simulating nanoparticle transport in complex 2D cement-based materials systems.

关键词： Markov chain Monte Carlo random-walk method Fokker-Planck equation LaSr_(0.5)C_(0.5)O_(3)(LSCO) cement nanoparticle incorporation

Closed loop harmonic content reduction for three phase induction machines control

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Closed loop harmonic content reduction for three phase induc...

Benzyl Amino Purine and Gibberellic Acid Coupled to Nitrogen-Limited Stress Induce Fatty Acids,Biomass Accumulation,and Gene Expression in Scenedesmus Obliquus

2010 Chinese Control and Decision Conference

作者： Francisco Franco Carlos Gaviria elena munoz Cauca University PoapyanColombia

ISBN: (纸本)9781424451814;9781424451821

＜正＞This paper presents a closed loop control technique for harmonic content reduction in the stator current of an induction machine feeded with a three phase inverter,within a velocity control *** a digital filter for Clarke transformation,a robust sliding flux observer,and a closed loop control for the zero sequence of a SVPWM three phase inverter,this work shows how the proposed schema can effectively reduce the harmonic content in the stator currents of the induction machine despite of variations on the load torque using just two sensors:a current sensor for one of the stator phases and a velocity sensor for the closed loop control of the velocity of the machine.

关键词： SVPWM induction machine flux observer sliding-mode

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Phyton-International Journal of Experimental Botany 2021年第2期90卷 515-531页

作者： Hans Christian Correa-Aguado Gloria Viviana Cerrillo-Rojas Alejandro Rocha-Uribe Ruth elena Soria-Guerra JoséFrancisco Morales-Domínguez Departamento de Química Centro de Ciencias BásicasUniversidad Autónoma de AguascalientesAguascalientes20131México Facultad de Ciencias Químicas Universidad Autónoma de San Luis PotosíSan Luis Potosí78210México Instituto Politécnico Nacional Unidad Profesional Interdisciplinaria de Ingeniería Campus ZacatecasBlvd.del Bote 202Cerro del Gato Ejido La EscondidaCol.Ciudad AdministrativaZacatecasZAC 98160Mexico

The need for renewable energy sources makes microalgae an essential feedstock for biofuels *** molecular aspects and the response to nitrogen(N)-limited conditions with a phytohormone stimulus in microalgae have been slightly *** this work,Scenedesmus obliquus was used as a study model to analyze the effect of benzyl amino purine(BAP)and gibberellic acid(GA)coupled to nitrogen limitation on cell growth,biomass and fatty *** selected 10^(-5)M BAP increased the biomass by 1.44-fold,and 10^(-6)M GA by *** total lipids also increased by 2.8 and 1.11-fold,*** 10^(-5)M BAP and 10^(-6)M GA addition to *** cultures at different initial nitrogen percentages(N-0,N-25,and N-50)showed a significant increase in cell growth and biomass productivity compared to the unstimulated *** N-0 and GA N-0 produced the highest lipid yields with 55%and 50%,*** lipid profile analysis revealed an increase,particularly in C18:1 and C16:0 fatty *** expression analysis showed an over-expression of acyl carrying protein(ACP),stearoyl-ACP desaturase(SAD),fatty acid acyl-ACP thioesterase(FATA),and diacylglycerol acyltransferase(DGAT)genes,which were mainly induced by nitrogen ***,BAP and GA produced a significant over-expression on these genes in the N-replete *** study shows that BAP and GA,coupled to N limitation stress,can be used to increase the biomass and lipid production in *** for sustainable biofuels.

关键词： Biodiesel gene expression lipids microalgae nitrogen deficiency phytohormones

Successful Management of a Complicated Ulcer Caused by Autoimmune Vasculitis, with Sildenafil Citrate in a Patient with Primary Antiphospholipid Syndrome and Transient Steroid-Induced Diabetes Mellitus: A Case Report and Literature Review

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Journal of Diabetes Mellitus 2014年第3期4卷 189-193页

作者： Fernando Grover-Paez Leonel Garcia-Benavides Ernesto German Cardona-munoz Carlos Gerardo Ramos-Becerra Jesus Ricardo Garcia-Corral Carlos Enrique Medina-Garcia Guillermo Adrian Alanis-Sanchez Sylvia elena Totsuka-Sutto Institute of Experimental and Clinical Therapeutics Department of PhysiologyUniversity Center of Health SciencesUniversity of GuadalajaraGuadalajaraMexico

Antiphospholipid syndrome (APS) is a prothrombotic condition that can affect both the venous circulation and the arterial system. The deep veins of the lower extremities and cerebral blood flow are the most common sites of venous and arterial thrombosis, respectively. Skin ulceration and gangrene may be associated with an active vasculitis in patients with APS. These kinds of ulcers are considered intractable because healing is difficult to achieve. Using steroids as immunesuppressant therapy is still a basic part of managing APS and vasculitis. Nevertheless, in the presence of steroid-induced diabetes mellitus, the priority is to achieve faster wound healing, because of the potential complications that can develop due to metabolic dysfunction and augmented vulnerability to infection. Until recently, there were few reports demonstrating the benefits of the use of adjuvant phosphodiesterase-5 inhibitors like sildenafil citrate in different clinical entities with courses like Raynaud’s phenomenon, scleroderma, and resistance to vasodilator therapy. We present the first report demonstrating the additional benefit of sildenafil citrate for the integration of grafts in a patient with steroid-induced diabetes and APS who had ulcers due to vasculitis resistant to the usual vasodilator therapy.

关键词： Autoimmune Vasculitis Sildenafil Citrate Steroid-Induced Diabetes Mellitus Primary Antiphospholipid Syndrome

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胸腰段脊柱骨折定量影像学

临床与病理杂志 2017年第4期37卷 649-660页

作者： Fernando Ruiz Santiago Pablo Tomas munoz elena Moya Sanchez Marta Revelles Paniza Alberto Martinez Martinez Antonio Luis Perez Abela Radiology Department Hospital of TraumatologyCarretera de Jaen SNGranada 18014Spain Radiology Department Ciudad Sanitaria Virgen de las NievesHospital Complex University of GranadaAvenida de las Fuerzas Armadas 2Granada 18014Spain Traumatology Department Hospital of TraumatologyCarretera de Jaen SNGranada 18014Spain 温州医科大学附属第二医院育英儿童医院骨科医院脊柱外科浙江省脊柱外科中心浙江省骨科学重点实验室

描述影响胸腰段脊柱不同类型骨折,以及指导脊柱骨折治疗的不同分类及关键影响因素。目前脊柱骨折分类以Denis三柱模型为基石,包括压缩性骨折、爆裂性骨折、屈曲牵张骨折和骨折伴脱位。骨折分类系统包括胸腰椎损伤分类和严重程度评分(Tho... 详细信息

描述影响胸腰段脊柱不同类型骨折,以及指导脊柱骨折治疗的不同分类及关键影响因素。目前脊柱骨折分类以Denis三柱模型为基石,包括压缩性骨折、爆裂性骨折、屈曲牵张骨折和骨折伴脱位。骨折分类系统包括胸腰椎损伤分类和严重程度评分(Thoracolumbar Injury Classification and Severity Score,TLICS)系统和AO脊柱胸腰椎损伤分类和严重程度评分(AOSpine-TLICS)。正确分类需要定量成像方法,采用多个测量指标来评定其属于不同TLICS或AOSpine-TLICS类型。如果TLICS评分>4或者AOSpine-TLICS评分>5,则患者需要手术治疗。本文重点描述X线片、CT及MRI影像表现和测量参数,包括爆裂性骨折患者中椎体楔形变成角和压缩性骨折椎体高度丢失百分比、椎弓根间距和腰椎管狭窄程度以及一些严重骨折(如屈曲牵张骨折、骨折伴脱位)患者的椎体位移和棘突间距增加。通过图解和影像案例展现这些影像学特征和相关参数。

关键词：脊柱骨折胸腰椎创伤脊柱损伤普通X线片成像计算机断层扫描

Seroprevalence study of infection with influenza A(H1N1)pdm09 virus in San Felipe Town, Chile

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World Journal of Cardiovascular Diseases 2013年第7期3卷 476-482页

作者： Olea Andrea Fasce Rodrigo Aguilera Ximena Oliva Otavio munoz Sergio Garcia Maritza Pedroni elena Najera Manuel Guerrero Andrea Bustos Patricia Mora Judith Vega Jeanette Cerda Jaime Abarca Katia McCarron Meg Widdowson Marc-Alain Castillo Ernesto Alvarado Sergio Quijada Sandra Gallegos Doris Gonzalez Claudia Center of Epidemiology and Health Policies Department Faculty of MedicineUniversidad del DesarrolloConcepcionChile Section of Respiratory and Exanthematous viruses Sub-Department of Clinical VirologyInstitute of Public HealthMinistry of HealthSantiagoChile Center of Epidemiology and Health Policies of the Universidad del Desarrollo ConcepcionChile Panamerican Health Organization Washington DCUSA Public Health Department and Pediatrics Division Faculty of MedicinePontifical Catholic University of ChileSantiagoChile Centers for Diseases Control and Prevention AtlantaUSA Center for Micro Data Economics DepartmentUniversity of ChileSantiagoChile Epidemiology and Health Policies Department Universidad del DesarrolloConcepcionChile

Objective: To know the natural history of the first wave of pandemic influenza A(H1N1)pdm09 in the Southern hemisphere, through the detection of antibodies against influenza A(H1N1)pdm09 in a selected community, to estimate the population attack rate and its variations, the consultation rates, hospitallization and mortality rates. Methodology: A representative random sample of the population of a commune in Chile (San Felipe) was interviewed and taken blood samples between January and March 2010. A study against the antibodies of the influenza A(H1N1) pdm09 virus was conducted, by the technique of the Hemaglutination Inhibition (HAI) according to standardized methodology. Subjects with antibody titers ≥1:40 were considered positive. Results: 13.5% of the population of San Felipe had antibodies against influenza A(H1N1)pdm09;this percentage reached 30% of the population between 0 and 18 years and 6.1% among those over 19 years. The age variable was the only factor that evidenced significant differences in the prevalence of antibodies. There were no significant differences related to gender, vaccination history against seasonal inluenza, or comorbidity. 51% of people with positive serology showed IN-FLUENZA-LIKE SYMPTOMS. Conclusions: A relevant percentage of subclinical disease was detected in the first pandemic wave in Chile and the proportion of people with SARI and deaths was small. Data from epidemiological surveillance were useful to estimate the trend of TSI but not its magnitude.

关键词： Influenza A(H1N1)pdm09 Influenza Seroprevalence