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Origami-inspired perovskite X-ray detector by printing and folding

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npj Flexible Electronics 2023年第1期7卷 471-478页

作者： Henning Mescher Fabian Schackmar Robert Huber Helge Eggers Marcus Zuber Elias Hamann Georg Gramlich Julian Dangelmaier Qiaoshuang Zhang Andres Georg Rösch Thomas Zwick gerardo hernandez-sosa Ulrich W.Paetzold Uli Lemmer Light Technology Institute(LTI) Karlsruhe Institute of Technology(KIT)Karlsruhe 76131Germany Institute of Microstructure Technology(IMT) Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany InnovationLab(IL) Heidelberg 69115Germany Institute for Photon Science and Synchrotron Radiation(IPS) Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany Laboratory for Applications of Synchrotron Radiation(LAS) Karlsruhe Institute of Technology(KIT)Karlsruhe 76131Germany Institute of Radio Frequency Engineering and Electronics(IHE) Karlsruhe Institute of Technology(KIT)Karlsruhe 76131Germany

X-ray detectors are of pivotal importance for the scientific and technological progress in a wide range of medical,industrial,and scientific ***,we take advantage of the printability of perovskite-based semiconductors and achieve a high X-ray sensitivity combined with the potential of an exceptional high spatial resolution by our origami-inspired folded perovskite X-ray *** high performance of our device is reached solely by the folded detector architecture and does not require any *** design and fabrication of a foldable perovskite sensor array is presented and the detector is characterized as a planar and as a folded *** to 50 kVp−150 kVp X-ray radiation,the planar detector reaches X-ray sensitivities of 25−35μC/(Gyaircm^(2)),whereas the folded detector achieves remarkably increased X-ray sensitivities of several hundredμC/(Gyaircm^(2))and a record value of 1409μC/(Gyaircm^(2))at 150 kVp without photoconductive ***,the potential of an exceptional high spatial resolution of the folded detector of more than 20 lp/mm under 150 kVp X-ray radiation is demonstrated.

关键词： perovskite exceptional planar

Influence of biomass burning on ozone levels in the Megalopolis of Central Mexico during the COVID-19 lockdown

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Journal of Environmental Sciences 2024年第9期143卷 99-115页

作者： Victor Almanza Luis gerardo Ruiz-Suárez Ricardo Torres-Jardón Agustín García-Reynoso Iván Y.Hernández-Paniagua Institute for Atmospheric Sciences and Climate Change National Autonomous University of MexicoCoyoacan 04510Mexico CityMexico

The massive reductions in anthropogenic emissions resulting from the COVID-19 lockdown provided a unique opportunity to evaluate the effect of mitigation measures aiming to abate air *** Mexico,the total lockdown period took place during the dry-hot season when biomass burning activity is ***,we investigate the role of biomass burning emissions on regional ozone levels in the Megalopolis of Central *** studied period covers the lockdown phases 2 and 3,and the first month of the New *** applied a factor separation technique and process analysis to estimate the pure and synergistic contributions of emission reductions under lockdown and that from biomass burning to daily ozone maximum concentrations in 7 metropolitan areas of different states in the *** results revealed that biomass burning plumes likely masked the effect of massive reductions from mobile emissions,impacted the PBL development during phase 3 and favored transition and mixed NO_(x)-limited and VOC-limited regional *** contributed to increased ozone production in the middle to lower PBL by changing the regional background levels which potentially could bias high ozone production efficiency *** the Megalopolis contribution to economic and societal development at national scale,our study suggests that ozone mitigation measures during the dry-hot season targeting mainly mobile emissions will likely be offset by biomass burning plumes.A regional and synergic policy aiming to control biomass burning would help to reduce the occurrence of high ozone levels in Central Mexico with the co-benefit of tackling short-lived climate pollutants.

关键词： COVID-19 Mexico Megalopolis Ozone Factor Separation Process Analysis

Model based current mode control design and experimental validation for a 3φ rectifier under unbalanced grid voltage conditions

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 777-790页

作者： P.R.MARTíNEZ-RODRIGEZ Jose M.sosa Samuel ITURRIAGA-MEDINA gerardo ESCOBAR gerardo VáZQUEZ-GUZMáN Andres A.VALDEZ-FERNáNDEZ School of Sciencies UASLP Laboratory of Electrical and Power Electronics ITESI School of Engineering Universidad Modelo

This paper addresses the control design and the experimental validation of a current mode control for a three phase voltage source rectifier. The proposed control law is able to fulfill the voltage regulation and the current tracking control objectives despite of unbalanced and distorted grid voltages. The proposed control law consists of two loops, which are referred as inner tracking loop and the outer voltage regulation loop. The inner loop is designed to provide damping to the system, which also includes and adaptive mechanism. The construction of the current reference is based on the positive component detection of thegrid voltage. Therefore, the current produced by the power rectifier is proportional to the fundamental component of the grid voltage, despite of the presence of unbalanced grid voltages. The voltage regulation loop is designed as a proportional-integral controller, which is aimed to regulate the DC output voltage to a desired level. Finally, experimental results are obtained in an experimental prototype of2 kW to evaluate the performance of the proposed controller.

关键词： Pulse-width modulation rectifier Power factor correction Positive-component Current mode control

Analysis and Validation for an Inverter-side Current Controller in LCL Grid-connected Power Systems

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Journal of Modern Power Systems and Clean Energy 2020年第2期8卷 387-398页

作者： Jose Msosa Panfilo R.Martinez-Rodriguez gerardo Escobar gerardo Vazquez Andres A.Valdez-Fernandez Juan F.Martinez-Garcia the Tecnologico Nacional de Mexico/ITS de Irapuato(TecNM/ITESI) IrapuatoGTO 36821Mexico the School of Sciences Autonomous University of San Luis Potosi(UASLP)San Luis PotosiSLP 78290Mexico Tecnologico de Monterrey N.L.64849Mexico

Transformerless grid-connected inverters offer greater efficiencies when transferring power from renewable energy sources to the electrical *** the grid-inverter connection is done with an LCL filter,high attenuation of switching harmonics is achieved while preserving a small-size output ***,damping must be included in the controller to assure closed-loop *** paper proposes a reference computation methodology for the inverter-side current feedback in a photovoltaic(PV)generation system connected to the grid through an LCL *** analysis of the closed-loop system stability and of the steady-state performance are presented as well as experimental validation of the closed-loop *** feedback controller includes active damping and relies on a resonant control structure which improves the ability of dealing with grid harmonic *** controller uses a reduced set of measurements,which requires the inverter-side current and grid voltage only,and assures a power factor close to unity.

关键词： LCL filter transformerless inverter grid connection inverter-side current feedback

Greenhouse Gas Emissions and Growth of Wheat Cultivated in Soil Amended with Digestate from Biogas Production

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Pedosphere 2017年第2期27卷 318-327页

作者： Liliana PAMPILLON-GONZALEZ Marco LUNA-GUIDO Victor Manuel RUIZ-VALDIVIEZO Olivia FRANCO-hernandez Fabign FERNANDEZ-LUQUENO Oetavio PAREDES-LOPEZ gerardo hernandez Luc DENDOOVEN PhD Program on Science Technology and Society Cinvestav IPN 2508 Mexico DF 07360 (Mexico) Laboratory of Soil Ecology Laboratorio de Matemdticas Aplicadas y Cdmputo de Alto Rendimiento Cinvestav-Edomex (ABACUS) Cinvestav IPN 2508 Mexico DF 07360 (Mexico) Department of Chemistry Unidad Profesional Interdisciplinaria de Biotecnologla-Instituto Politdcnico Nacional (UPIBI-IPN) Me- xico DF 07340 (Mexico) Sustainability of Natural Resources and Energy Program Cinvestav-Saltillo 1062 Coahuila 25900 (Mexico) Department of Biotechnology and Biochemistry Cinvestav Irapuato 36821 (Mexico)

Digestate, the product obtained after anaerobic digestion of organic waste for biogas production, is rich in plant nutrients and might be used to fertilize crops. Wheat （Triticum spp. L.） was fertilized with digestate, urea, or left unfertilized and cultivated in the greenhouse for 120 d. Emissions of greenhouse gasses （carbon dioxide （CO2）, methane （CH4）, and nitrous oxide （N20）） were monitored and plant growth characteristics were determined at harvest. The digestate was characterized for heavy metals, pathogens, and C and N mineralization potential in an aerobic incubation experiment. No Salmonella spp., Shigella spp., or viable eggs of helminths were detected in the digested pig slurry, but the number of faecal coliforms was as high as 3.6 ~ 104 colony-forming units （CFU） g-1 dry digestate. The concentrations of heavy metals did not surpass the upper limits established by US Environmental Protection Agency （EPA）. After 28 d, 17% of the organic C （436 g kg-1 dry digestate） and 8% of the organic N （6.92 g kg-1 dry digestate） were mineralized. Emissions of CO2 and CH4 were not significantly affected by fertilization in the wheat-cultivated soil, but digestate significantly increased the cumulative N20 emission by 5 times compared to the urea-amended soil and 63 times compared to the uncultivated unfertilized soil. It could be concluded that digestate was nutrient rich and low in heavy metals and pathogens, and did not affect emissions of CH4 and CO2 when applied to a soil cultivated with wheat, but increased emission of N20. Key Words： biodigester, C and N mineralization potential, faecal coliform, heavy metal, pathogen, pig slurry

关键词： biodigester C and N mineralization potential faecal coliform heavy metal pathogen pig slurry

Post-occupancy evaluation of a restored industrial building： A contemporary art and design gallery in Mexico

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Frontiers of Architectural Research 2015年第4期4卷 330-340页

作者： J. Mundo-hernandez M.C. Valerdi-Nochebuena J. sosa-Oliver Department of Architecture Universidad de las Americas Puebla Puebla 72810 Mexico Faculty Of Architecture BenemOrita Universidad Aut6noma de Puebla Puebla 72000 Mexico

This paper presents the results obtained from a post-occupancy evaluation （POE） study conducted in an old fabric building called ＂La VToleta＂. This structure has been recently converted into a contemporary art *** Violeta is located in Puebia City, Mexico. The buiidieg dates from the beginning of the 19th century; it was buitt and used as a textite factory until the first decades of the 20th century. This POE study aims to assess the new use of the buildieg from the users＇ point of view. Methodology involves historical research of the building, analysis of the conversion strategy, watkthrough investigation, and a user survey. Questions regarding the re-utilization strategy used in the building and its current use are inctuded in the survey, such as ＂Hew do people perceive the space regarding its functionality, accessibility, and comfort？＂ ALthough the re-utitization process destroyed several historic elements, the re-use of old industrial spaces that otherwise would be obsotete and disused seems pertinent. Developing stoatl renovation projects as part of an integrat and wider project seems feasible. Users perceive the buiidinR as comfortabte but not property advertised as an art gallery, and its location is difficult to find.

关键词： Industrial Heritage Users' perception Art gallery Post-occupancyevatuation

Phase equilibrium modelling of the amphibolite facies metamorphism in the Yelapa-Chimo Metamorphic Complex, Mexico

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Geoscience Frontiers 2021年第1期12卷 293-312页

作者： Fabian Gutierrez-Aguilar Peter Schaaf Gabriela Solís-Pichardo gerardo F.Arrieta-García Teodoro hernandez-Trevino Carlos Linares-Lopez Posgrado en Ciencias de la Tierra Instituto de GeofísicaUniversidad Nacional Autonoma de MexicoAv.Universidad 3000Ciudad de Mexico04510Mexico Laboratorio Universitario de Geoquímica Isotopica(LUGIS) Instituto de GeofísicaUniversidad Nacional Autonoma de MexicoAv.Universidad 3000Ciudad de Mexico04510Mexico Laboratorio Universitario de Geoquímica Isotopica(LUGIS) Instituto de GeologíaUniversidad Nacional Autonoma de MexicoAv.Universidad 3000Ciudad de Mexico04510Mexico Instituto de Geofísica Universidad Nacional Autonoma de MexicoAv.Universidad 3000Ciudad de Mexico04510Mexico

The Yelapa-Chimo Metamorphic Complex forms part of the Jalisco Block in western Mexico and exposes a wide range of Early Cretaceous metamorphic rocks;such as paragneiss,orthogneiss,amphibolites,and ***,the pressure-temperature(P-T)conditions of metamorphism and partial melting remain poorly studied in the *** elucidate metamorphic P-T conditions,phase equilibrium modelling was applied to two sillimanite-garnet paragneisses,one amphibole-orthogneiss,and one ***-garnet paragneisses exhibit a lepidoblastic texture with a biotite+sillimanite+kyanite+garnet+quartz+plagioclase+K-feldspar mineral ***-orthogneiss and amphibolite display a nematoblastic texture with an amphibole+(1)plagioclase+quartz+(1)titanite assemblage and an amphibole+(2)plagioclase+(2)titanite+ilmenite retrograde mineral *** calculated for the two sillimanite-garnet paragneiss samples show P-T peak conditions at~6-7.5 kbar and~725-740℃.The results for amphibole-orthogneiss and the amphibolite yield P-T peak conditions at~8.5-10 kbar and~690-710℃.The mode models imply that metasedimentary and metaigneous units can produce up to~20 vol%and~10 vol%of melt,*** within a closed system during isobaric heating suggests that melt compositions of metasedimentary and metaigneous units are likely to have direct implications for the petrogenesis of the Puerto Vallarta *** new data indicate that the Yelapa-Chimo Metamorphic Complex evolved through a metamorphic gradient between~23-33℃km^-1and the metamorphic rocks formed at depths between~22 km and~30 km with a burial rate of~2.0 km Ma^-***,the P-T data for both metasedimentary and metaigneous rocks provide new constraints on an accretionary framework,which is responsible for generating metamorphism and partial melting in the YelapaChimo Metamorphic Complex during the Early Cretaceous.

关键词： Phase equilibrium modelling Yelapa-Chimo Metamorphic Complex Amphibolite facies Partial melting

The Potentiality of Non Timber Forest Products. Fruit Availability, Phytochemical Properties of Rosa rubiginosa L. Rose Hips

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American Journal of Plant Sciences 2016年第15期7卷 2272-2287页

作者： gerardo U. Aguirre Martín Loza José Gasquez María Fusco Angela sosa Gladys M. Ciuffo Liliana E. C. Ciuffo Ecología y Conservación Facultad de Química Bioquímica y Farmacia Universidad Nacional de San Luis San Luis Argentina UNSL/FQBF/Química Analítica Ejército de los Andes San Luis Argentina UNSL/FQBF/Farmacognosia Ejército de los Andes San Luis Argentina UNSL/FQBF/Bioquímica Avanzada Ejército de los Andes San Luis Argentina IMIBIO/CONICET Ejército de los Andes San Luis Argentina

We evaluated fruit availability, phytochemical characteristics and mineral content of R. rubiginosa L. rose hips, at two experimental sites in San Luis province: Potrero de los Funes-El Volcán (PF-V) and Estancia Grande (EG). Plant density was 70 plants/ha (1 ha = 10,000 m2) in PF-V and 50 plants/ha in EG. Fruit availability (DF) in fresh fruits (FF) was 4.39 kg (PF-V) and 3.10 kg (EG) during March, and decreased during June. Ascorbic acid in FF increased during ripening period, peaking on late April, early May, and diminished 75% - 85% in dried fruits. Total soluble solids in FF ranged from 32.55 to 55.20 °Brix. Elements Ba, Ca, Fe, K, Zn and Cu, determined by inductively coupled plasma optical emission spectrometry (ICP-OES), were significant for human health. Dried fruits maintain a high level of ascorbic acid, a characteristic added to content of mineral elements, particularly calcium content, providing an important nutritional value to R. rubiginosa rose hips.

关键词： Rosa rubiginosa Rose Hips Fruit Chemical Contents Ascorbic Acid Mineral Elements

Estimate of the Crystallization Kinetics in Stoichiometry Compositions Films of Ge:Sb:Te

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Journal of Surface Engineered Materials and Advanced Technology 2012年第1期2卷 44-46页

作者： Carlos Virgilio Rivera Rodriguez Eduardo Morales Sanchez Jesus Gonzalez hernandez Evgen Prokhorov Juan Munoz Saldana gerardo Trapaga Martinez Ciencias Ambientales del Instituto Nacional de Investigaciones Nucleares La MarquesaMexico CICATA-IPN Unidad Queretaro QueretaroMexico Centro de Investigacion en Materiales Avanzados ChihuahuaMexico CINVESTAV-Qro. QueretaroMexico

The aim of this work is to compare the isothermal crystallization kinetic in the films along GeTe-Sb2Te3 line with composition Ge2Sb2Te5, Ge1Sb2Te4 Ge1Sb4Te7 and Ge4Sb1Te5 using mainly Johnson–Mehl–Avrami-Kolmogorov (JMAK) model. Results obtained have shown different crystallization mechanism in the investigated films. In Ge2Sb2Te5 and Ge1Sb2Te4 films the analysis of the kinetic results (Avrani coefficient) showed that at the beginning of crystallization a metastable phase appeared with the Ge1Sb4Te7 composition, this is followed by the nucleation and growth of the stable fcc phase up to full crystallization. In contrast Ge4Sb1Te5 and Ge1Sb4Te7 films show diffusion control growing from small dimension grains with decreasing nucleation rate.

关键词： Crystallization Ge:Sb:Te JMAK Model