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Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications

Nano Research 2019年第5期12卷 1041-1047页

作者： Md Tanvir Hasan roberto gonzalez-rodriguez Conor Ryan Kristof Pota Kayla Green Jeffery L.Coffer Anton V.Naumov Department of Physics and Astronomy Texas Christian UniversityTCU Box 298840Fort WorthTexas 76129USA Department cf Chemistry and Eiochemistry Texas Christian UniversityTCU Box 298860Fort WorthTexas 76129USA

In this work,we utilize a bottom-up approach to synthesize nitrogen self-doped graphene quantum dots (NGQDs) from a single glucosamine precursor via an eco-friendly microwave-assisted hydrothermal *** and optical properties of as-produced NGQDs are further modified using controlled ozone ***-treated NGQDs (Oz-NGQDs) are reduced in size to 5.5 nm with clear changes in the lattice structure and/D//G Raman ratios due to the introduction/alteration of oxygen-containing functional groups detected by Fourier-transform infrared (FTIR) spectrometer and further verified by energy dispersive X-ray spectroscopy (EDX) showing increased atomic/weight percentage of oxygen *** with structural modifications,GQDs experience decrease in ultraviolet-visible (UV-vis) absorption coupled with progressive enhancement of visible (up to 16 min treatment) and near-infrared (NIR)(up to 45 min treatment) *** allows fine-tuning optical properties of NGQDs for solar cell applications yielding controlled emission increase,while controlled emission quenching was achieved by either blue laser or thermal *** Oz-NGQDs were further used to form a photoactive layer of solar calls with a maximum efficiency of 2.64% providing a 6-fold enhancement over untreated NGQD devices and a 3-fold increase in fill factor/current *** study suggests simple routes to alter and optimize optical properties of scalably produced NGQDs to boost the photovoltaic performance of solar cells.

关键词： nitrogen-doped graphene quantum dots ozone treatment optical properties photovoltaics solar cells

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＂Takeaway＂ drug delivery： A new nanomedical paradigm

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Nano Research 2017年第7期10卷 2234-2243页

作者： Elena gonzalez-Domfnguez Benito rodriguez-gonzalez Moises Perez-Lorenzo Miguel A. Correa-Duarte Department of Physical Chemistry Biomedical Research Center (CINBIO) and Southern Galicia Institute of Health Research (IISGS)Universidade de Vigo 36310 Vigo Spain

An alternative model to the well-established paradigm of the externally switchable drug delivery systems is herein proposed. In contrast to the on--off archetype, here the amount of released drug is pre-set by the application of an external stimulus, and is gradually released after the withdrawal of the exogenous signal. These attributes are achieved through an innovative approach featuring the integration of plasmonic nanovehicles in a polymer-based film. Such a platform is provided with optically responsive capabilities together with multiple diffusional barriers, allowing for an ＂on-demand＂ time-limited release where light acts as a therapeutic ＂starting shot＂. These nanoarchitectured depots have great potential as implantable drug delivery systems in clinical scenarios where a recurrent, sustained, and yet, on--off administration of medication is required. The application of these hybrid materials may extend the implementation of nanomedicine strategies beyond the point-of-care setting.

关键词： release plasmonic nanocapsule hydrogel near infrared (NIR)

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Age-adjusted NT-proBNP could help in the early identification and follow-up of children at risk for severe multisystem inflammatory syndrome associated with COVID-19(MIS-C)

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World Journal of Clinical Cases 2022年第29期10卷 10435-10450页

作者： Moises rodriguez-gonzalez Ana Castellano-Martinez Division of Pediatric Cardiology Puerta del Mar University HospitalCadiz 11009Spain Division of Pediatric Nephrology Puerta del Mar University HospitalCadiz 11009Spain

BACKGROUND Multisystem inflammatory syndrome in children(MIS-C) has emerged as a new disease associated with COVID-19 that presents in acute critically ill children with acute cardiovascular *** To determine whether the age-adjusted N-terminal pro-brain natriuretic peptide(NT-proBNP) value(Z-log-NT-proBNP) is associated with severe MIS-C and myocardial *** A retrospective study was conducted which included children with MIS-C managed at our institution between April 1,2020,and February 28,*** divided the population into groups depending on severity based on pediatric intensive care unit(PICU) *** compared Z-log-NT-proBNP values across these groups and analyzed Z-log-NT-proBNP dynamics during the onemonth *** We included 17 participants [median age 3(2-9) years] and seven(41%) required PICU ***(100%) of these cases presented very high(Z-log > 4) levels of NT-proBNP at the time of admission compared to only 5(50%) patients with non-severe MIS-C(P = 0.025).NT-proBNP was significantly correlated with highsensitive Troponin I levels(P = 0.045),Ross modified score(P = 0.003) and left ventricle ejection fraction(P = 0.021).CONCLUSION Raised NT-proBNP,specifically very high values(Z-log-NT-proBNP > 4) could help in the early identification of MIS-C patients with myocardial dysfunction requiring inotropic support and PICU admission.

关键词： Multisystem inflammatory syndrome associated with COVID-19 COVID-19 SARS-CoV-2 NT-proBNP Echocardiography Myocardial dysfunction Children

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Small-signal Model for Dual-active-bridge Converter Considering Total Elimination of Reactive Current

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Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 450-458页

作者： Juan Ramon rodriguez-rodriguez Nadia Maria Salgado-Herrera Jacinto Torres-Jimenez Nestor gonzalez-Cabrera David Granados-Lieberman Martin Valtierra-rodriguez the Universidad Nacional Autonoma de Mexico Facultad de IngenieriaDepto.Energia Electri-ca.Av.Universidad 3000Col.UNAM CUCoyoacanCDMXMexico the Instituto de Energias Renovables Universidad Nacional Autonoma de MexicoPriv.Xochicalco s/nCol.Centro.TemixcoMorelosMexico the Instituto Tec-nologico Superior de Irapuato Carretera Irapuato-Silao km 12.5.IrapuatoGuanajuatoMexico the Universidad Autonoma de Queretaro Campus San Juan del RioRio Moctezuma 249San Juan del RioQueretaroMexico

Emerging technologies such as electric vehicles,solid-state transformers,and DC transformers are implemented using the closed-loop bi-directional dual-active-bridge(DAB)*** this context,it is necessary to have average models that provide an efficient way of tuning the proportional integral(PI)compensator parameters for large-and small-signal *** present a novel small-signal model(SSM)for DAB converter with a single closed-loop PI controller and the total elimination of reactive current(IQ=0).The method applies a modulation technique for IQ=0 and introduces a composite function in the controller while reducing the original nonlinear switching model,which allows to decrease the order of the transfer function and analyze the closed-loop *** proposed SSM is analyzed using different response time,load,and DC voltage *** simulation and experimental results demonstrate the ease of implementation and effectiveness of the proposed model with respect to other SSM techniques.

关键词： Small-signal model(SSM) dual-active-bridge(DAB)converter reactive current elimination proportional integral(PI)control

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A novel and stretchable carbon-nanotube/Ni@TiO_(2):W photocatalytic composite for the complete removal of diclofenac drug from the drinking water

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Journal of Environmental Sciences 2023年第4期126卷 575-589页

作者： Ernesto Valadez-Renteria Rafael Perez-gonzalez Christian Gomez-Solis Luis Armando Diaz-Torres Armando Encinas Jorge Oliva Vicente rodriguez-gonzalez Consejo Nacional de Ciencia y Tecnología-División de Materiales Avanzados Instituto Potosino de Investigación Científica y TecnológicaSan Luis Potosí78216México División de Ciencias e Ingenierías Universidad de GuanajuatoLeón 37150México Grupo de Espectroscopia de Materiales Avanzados y Nanoestructurados(GEMANA) Centro de Investigaciones enópticaA.C.Lomas Del CampestreLeón 37150México

We present the structural,morphological and photocatalytic properties of stretchable composites made with carbon nanotubes (CNTs),silicon rubber and Ni@TiO_(2):W nanoparticles(TiWNi NPs) with average size of 37±2 *** images showed that the TiWNi NPs decorated the surface of the CNT fibers,which are oriented in a preferential *** NPs presented a mixture of anatase/rutile phases with cubic *** performance of the TiWNi powders and stretchable composites was evaluated for the photocatalytic degradation of diclofenac (DCF) anti-inflammatory drug under ultraviolet-visible *** results revealed that the maximum DCF degradation percentages were 34.6%,91.9%,97.1%,98.5%and 100%for the CNT composite (stretched at 0%),TiWNi powders,CNT+TiWNi(stretched at 0%),CNT+TiWNi (stretched at 50%) and CNT+TiWNi (stretched at 100%),***,stretching the CNT+TiWNi composites was a good strategy to enhance the DCF degradation percentage from 97.1%to 100%,since stretching created additional defects (oxygen vacancies) that acted as electron sink,delaying the electron-hole recombination,and favors the DCF ***/absorbance measurements confirmed the presence of such ***,the reactive oxygen species (ROS) were determined by the scavenger’s experiments and found that the main ROS were the·OH and O_(2)-radicals,which attacked the DCF molecules,causing their *** results of this investigation confirmed that the stretchable CNT/TiWNi-based composites are a viable alternative to remove pharmaceutical contaminants from water and can be manually separated from the decontaminated water,which is unviable using photocatalytic powders.

关键词： Diclofenac Pharmaceutical contaminant TiO_(2) Carbon nanotubes Stretchable composite Photocatalysis

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Efficient removal of the recalcitrant metamizole contaminant from drinking water by using a CaLaCoO_(9) perovskite supported on recycled polyethylene

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Journal of Environmental Sciences 2024年第2期136卷 56-67页

作者： Ernesto Valadez-Renteria Christian Perez-Carrasco Dulce Yolotzin Medina-Velazquez Vicente rodriguez-gonzalez Jorge Oliva CONACYT-División de Materiales Avanzados Instituto Potosino de Investigación Científica y Tecnológica A.C.San Luis PotosíSLP 78216México División de Ciencias Básicas e Ingeniería Universidad Autónoma Metropolitana AzcapotzalcoCol.Reynosa-TamaulipasC.P.MéxicoDF 02200México

Metamizole(MZ)is a widely used anti-inflammatory *** to its common use,this contaminant is found in sewage and *** order to reduce the contamination produced by the MZ,we fabricated in this work a photocatalytic composite using recycled polyethylene(RPE)and the CaLaCoO_(9)(LCCO)*** nanoparticles had a microplate-like morphology and sizes of 1.4–5.5μm according to the analysis of *** photocatalytic properties of the LCCO powders were evaluated under ultraviolet-visible(UV-Vis)irradiation and found a removal efficiency of 96%.When the RPE+LCCO composite was employed for the photocatalytic degradation of MZ,a maximum degradation of 92.5%was *** influence of the pH on the photocatalytic activity was also studied and found that an initial pH=3 produced a total degradation of MZ after 240 min of UV-Vis ***,three reuse cycles were carried out for the pure LCCO powders and for the RPE+LCCO composites and found that the maximum loss of degradation was 5%.Furthermore,scavenger experiments demonstrated that the super oxide and hydroxyl radicals are formed during the photocatalytic reaction and were responsible for the degradation of ***,the X-ray photoelectron-spectroscopy and Raman analysis demonstrated the formation of defects(oxygen vacancies),those ones delayed the electron-hole recombination,which in turn,enhanced the degradation of the ***,the studies performed in this work proved that composites made with recycled plastics and LCCO perovskites are a low-cost and feasible alternative for the cleaning of water sources polluted with pharmaceutical compounds.

关键词： Photocatalysis Metamizole Pharmaceutical contaminant UV-Vis irradiation Perovskite

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Alliance Free and Alliance Cover Sets

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Acta Mathematica Sinica,English Series 2011年第3期27卷 497-504页

作者： Juan Alberto rodriguez-VELAZQUEZ Jose Maria SIGARRETA Ismael gonzalez YERO Sergio BERMUDO Departament d'Enginyeria Informdtica i Matematiques Universitat Rovira i Virgili Av. Paisos Catalans 26 43007 Tarragona Spain Faculty of Mathematics Autonomous University of Guerrero Carlos E. Adame 5 Col. La Garita Acapuleo Guerrero Mexico Departament d'Enginyeria Informatica i Matematiques Universitat Rovira i Virgili Av. Pai'sos Catalans 26 43007 Tarragona Spain Department of Economy Quantitative Methods and Economic History Pablo de Olavide University Carretera de Utrera Kin. 1 41013 Sevilla Spain

A defensive （offensive） k-alliance in F = （V, E） is a set S C V such that every v in S （in the boundary of S） has at least k more neighbors in S than it has in V ／ S. A set X C_ V is defensive （offensive） k-alliance free, if for all defensive （offensive） k-alliance S, S／ X ≠ 0, i.e., X does not contain any defensive （offensive） k-alliance as a subset. A set Y C V is a defensive （offensive） k-alliance cover, if for all defensive （offensive） k-alliance S, S ∩ Y ≠ 0, i.e., Y contains at least one vertex from each defensive （offensive） k-alliance of F. In this paper we show several mathematical properties of defensive （offensive） k-alliance free sets and defensive （offensive） k-alliance cover sets, including tight bounds on their cardinality.

关键词： Defensive alliance offensive alliance alliance free set alliance cover set

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Clinical presentation and early predictors for poor outcomes in pediatric myocarditis:A retrospective study

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World Journal of Clinical Cases 2019年第5期7卷 548-561页

作者： Moises rodriguez-gonzalez Maria Isabel Sanchez-Codez Manuel Lubian-Gutierrez Ana Castellano-Martinez Department of Pediatric Cardiology Puerta del Mar University Hospital Department of Pediatrics Puerta del Mar University Hospital Department of Pediatric Nephrology Puerta del Mar University Hospital

BACKGROUND Myocarditis is an important cause of morbidity and mortality in children, leading to long-term sequelae including chronic congestive heart failure, dilated cardiomyopathy, heart transplantation, and death. The initial diagnosis of myocarditis is usually based on clinical presentation, but this widely ranges from the severe sudden onset of a cardiogenic shock to asymptomatic patients. Early recognition is essential in order to monitor and start supportive treatment prior to the development of severe adverse events. Of note, many cases of fulminant myocarditis are usually misdiagnosed as otherwise minor conditions during the weeks before the unexpected *** To provide diagnostic clues to make an early recognition of pediatric *** investigate early predictors for poor *** We conducted a retrospective cross-sectional single-center study from January 2008 to November 2017 at the Pediatric Department of our institution, including children < 18-years-old diagnosed with myocarditis. Poor outcome was defined as the occurrence of any of the following facts: death, heart transplant, persistent left ventricular systolic dysfunction or dilation at hospital discharge(early poor outcome), or after 1 year of follow-up(late poor outcome). We analyzed different clinical features and diagnostic test findings in order to provide diagnostic clues for myocarditis in children. Multivariable stepwise logistic regression analysis was performed using all variables that had been selected by univariate analysis to determine independent factors that predicted a poor early or late outcome in our study *** A total of 42 patients [69% male; median age of 8(1.5-12) years] met study inclusion criteria. Chest pain(40%) was the most common specific cardiac symptom. Respiratory tract symptoms(cough, apnea, rhinorrhea)(38%),shortness of breath(35%), gastrointestinal tract symptoms(vomiting, abdominal pain, diarrhea)(33%), and fever(31%) were

关键词： Myocarditis Children Echocardiography N-terminal pro-brain natriuretic peptide Myocardial ischemia Cardiac magnetic resonance imaging Heart transplantation Dilated cardiomyopathy

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Pain assessment and management in the newborn:A systematized review

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World Journal of Clinical Cases 2021年第21期9卷 5921-5931页

作者： Maria Teresa Garcia-rodriguez Sergio Bujan-Bravo Rocio Seijo-Bestilleiro Cristina gonzalez-Martin Research in Nursing and Health Care Institute of Biomedical Research of A Coruña(INIBIC)Complexo Hospitalario Universitario de A Coruña(CHUAC)SERGASAs Xubias 8415006 A Coruña Universidade da Coruña(UDC)A Coruña 15006Spain Health Sciences Complexo Hospitalario Universitario de A CoruñaA Coruña 15006Spain

BACKGROUND Neonatal pain has been underdiagnosed due to several false *** To determine the status of neonatal pain in newborns who are admitted to intensive care *** Different databases were *** reviews and research reports conducted in newborns that were written in English,Spanish,or Portuguese,published between 2010 and 2020,and having free access to the full text were selected.A total of 135 articles were found,and 18 articles were finally *** Newborns are exposed to numerous painful *** order to assess their pain levels,several scales have been used,although they are sometimes not correctly *** terms of pain management,the nursing team plays a very important role based mainly on both pharmacological and non-pharmacological *** Nursing staff members must be well trained in order to identify pain and to interpret the scales ***,they have an important role in performing non-pharmacological procedures for pain management.

关键词： Neonatal pain Intensive care unit Nursing Management Treatment Systematized review

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Effect of age on visual and refractive results after LASIK: mechanical microkeratome versus femtosecond laser

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International Journal of Ophthalmology(English edition) 2019年第3期12卷 488-495页

作者： Montserrat Garcia-gonzalez Juan Gros-Otero Isabel rodriguez-Perez Alberto Rodero Miguel A.Teus Clínica Novovisión Madrid Clínica Rementería Universidad Europea de Madrid Villaviciosa de Odón 28670 Hospital Universitario "Príncipe de Asturias" University of Alcalá

AIM: To evaluate the effect of age on visual and refractive results after laser in situ keratomileusis(LASIK) obtained with a mechanical microkeratome or a femtosecond ***: Retrospective, nonrandomized, cohort study. A total of 3826 eyes were included in the study(1725 eyes treated with mechanical LASIK and 2101 eyes treated with femtosecond LASIK). The relationship between patient age and the 3-month postoperative visual and refractive results of both procedures were analyzed by linear regression ***: Three months postoperatively, we found a significant correlation between age and the postoperative spherical equivalent(SE; r2=0.004, P=0.006), efficacy(r2=0.006, P=0.001), and safety indexes(r2=0.05, P=0.0001) in the mechanical LASIK group. On the other hand, we found a significant correlation between age and the postoperative SE(r2=0.02, P=0.0001) and the efficacy index(r2=0.01, P=0.0001) but not the safety index in the femtosecond laser group. Mechanical LASIK provided slightly but significantly better efficacy and predictability in patients 18 to 40 years of age and femtosecond LASIK did so in patients older than 40 years of age. The femtosecond laser provided better safety results than the mechanical microkeratome in both age groups. CONCLUSION: A tendency toward undercorrection and less predictability is found with aging after myopic LASIK regardless of whether the flap was created with a mechanical microkeratome or a femtosecond laser. However, femtosecond laser provides significantly betteroutcomes in terms of efficacy, safety and predictability compared to mechanical microkeratome for the correction of myopia in patients over 40 y.

关键词： laser in situ keratomileusis femtosecond femtosecond laser in situ keratomileusis age

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