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Avoiding transduction-induced heating in suspended microchannel resonators using piezoelectricity

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Microsystems & Nanoengineering 2021年第2期7卷 231-237页

作者： Damien Maillard Annalisa De Pastina Amir Musa Abazari luis guillermo villanueva Advanced NEMS Laboratory Institute of Mechanical Engineeringfcole Polytechnique Federale de Lausanne(EPFL)1015 LausanneSwitzerland Center for Research on Adaptive Nanostructures and Nanodevices(CRANN) Trinity College Dublin(TCD)Dublin 2Ireland Department of Mechanical Engineering Faculty of EngineeringUrmia UniversityUrmiaIran

Calorimetry of single biological entities remains *** microchannel resonators(SMRs)offer excellent performance for real-time detection of various analytes and could hold the key to unlocking pico-calorimetry ***,the typical readout techniques for SMRs are optical-based,and significant heat is dissipated in the sensor,altering the measurement and worsening the frequency *** this manuscript,we demonstrate for the first time full on-chip piezoelectric transduction of SMRs on which we focus a laser Doppler vibrometer to analyze its *** demonstrate that suddenly applying the laser to a water-filled SMR causes a resonance frequency shift,which we attribute to a local increase in *** the procedure is repeated at increasing flow rates,the resonance frequency shift diminishes,indicating that convection plays an important role in cooling down the device and dissipating the heat induced by the *** also show that the frequency stability of the device is degraded by the laser *** comparison to an optical readout scheme,a low-dissipative transduction method such as piezoelectricity shows greater potential to capture the thermal properties of single entities.

关键词： temperature. suspended filled

Manufacture and characterization of graphene membranes with suspended silicon proof masses for MEMS and NEMS applications

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Microsystems & Nanoengineering 2020年第1期6卷 1050-1066页

作者： Xuge Fan Anderson D.Smith Fredrik Forsberg Stefan Wagner Stephan Schroder Sayedeh Shirin Afyouni Akbari Andreas C.Fischer luis guillermo villanueva Mikael Ostling Max C.Lemme Frank Niklaus Division of Micro and Nanosystems School of Electrical Engineering and Computer ScienceKTH Royal Institute of TechnologySE-10044 StockholmSweden Division of Integrated Devices and Circuits School of Electrical Engineering and Computer ScienceKTH Royal Institute of TechnologySE-16440 KistaSweden Faculty of Electrical Engineering and Information Technology RWTH Aachen UniversityOtto-Blumenthal-Str.2552074 AachenGermany Advanced NEMS Group École Polytechnique Fédérale de Lausanne(EPFL)1015 LausanneSwitzerland Silex Microsystems AB 17526 JärfällaSweden AMO GmbH Advanced Microelectronic Center Aachen(AMICA)Otto-Blumnethal-Str.2552074 AachenGermany

Graphene’s unparalleled strength,chemical stability,ultimate surface-to-volume ratio and excellent electronic properties make it an ideal candidate as a material for membranes in micro-and nanoelectromechanical systems(MEMS and NEMS).However,the integration of graphene into MEMS or NEMS devices and suspended structures such as proof masses on graphene membranes raises several technological challenges,including collapse and rupture of the *** have developed a robust route for realizing membranes made of double-layer CVD graphene and suspending large silicon proof masses on membranes with high *** have demonstrated the manufacture of square graphene membranes with side lengths from 7µm to 110µm,and suspended proof masses consisting of solid silicon cubes that are from 5µm×5µm×16.4µm to 100µm×100µm×16.4µm in *** approach is compatible with wafer-scale MEMS and semiconductor manufacturing technologies,and the manufacturing yields of the graphene membranes with suspended proof masses were>90%,with>70%of the graphene membranes having>90%graphene area without visible *** measured resonance frequencies of the realized structures ranged from tens to hundreds of kHz,with quality factors ranging from 63 to *** graphene membranes with suspended proof masses were extremely robust,and were able to withstand indentation forces from an atomic force microscope(AFM)tip of up to~*** proposed approach for the reliable and large-scale manufacture of graphene membranes with suspended proof masses will enable the development and study of innovative NEMS devices with new functionalities and improved performances.

关键词： proof characterization hundreds

Twenty years of population dynamics in European beech-oak forest at their rear range margin anticipate changes in its structure and composition

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Forest Ecosystems 2024年第3期11卷 358-370页

作者： álvaro Rubio-Cuadrado Iciar Alberdi Isabel Canellas Fernando Montes Jesús Rodríguez-Calcerrada Rosana López guillermo G.Gordaliza María Valbuena-Carabana Nikos Nanos Ramón Perea luis Gil Departamento de dinamica y gestion forestal Instituto de Ciencias Forestales(ICIFOR-INIA)CSICCtra.La Coruna km 7.528040MadridSpain Departamento de Sistemas y Recursos Naturales Escuela Tecnica Superior de Ingeniería de MontesForestal y del Medio NaturalUniversidad Politecnica de Madrid.Ciudad Universitaria s/n28040MadridSpain School of Forestry and Natural Environment Aristotle University of ThessalonikiUniversity Campus54124ThessalonikiGreece

There is an increasing interest in restoring degraded forests,which occupy half of the forest *** the forms of restoration,passive restoration,which involves the elimination of degrading factors and the free evolution of natural dynamics by applying minimal or no management,is gaining *** dynamics is difficult to predict due to the influence of multiple interacting factors such as climatic and edaphic conditions,composition and abundance of species,and the successional character of these ***,we study the natural dynamics of a mixed forest located in central Spain,which maintained an open forest structure,due to intensive use,until grazing and cutting were banned in the *** most frequent woody species in this forest are Fagus sylvatica,Quercus petraea,Quercus pyrenaica,Ilex aquifolium,Sorbus aucuparia,Sorbus aria and Prunus avium,with contrasting shade and drought *** species are common in temperate European deciduous forest and are found here near their southern distribution limit,except for *** order to analyze forest dynamics and composition,three inventories were carried out in 1994,2005 and *** results show that,despite the Mediterranean influence,the natural dynamics of this forest has been mainly determined by different levels of shade *** the abandonment of grazing and cutting,*** expanded rapidly due to its lower shade tolerance,whereas after canopy closure and forest densification,shade-tolerant species gained ground,particularly ***,despite its lower drought and late-frost *** the current dynamics continue,*** will overtake the rest of the species,which will be relegated to sites with shallow soils and steep ***,all the multi-centennial beech trees,which are undergoing a rapid mortality and decline process,will disappear.

关键词： Forest succession Secondary forest Woodland Mixed forest Competition Recruitment

Design and fabrication of a vigorous“cavitation-on-a-chip”device with a multiple microchannel configuration

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Microsystems & Nanoengineering 2021年第3期7卷 149-161页

作者： Farzad Rokhsar Talabazar Mohammad Jafarpour Merve Zuvin Hongjian Chen Moein Talebian Gevari luis guillermo villanueva Dmitry Grishenkov Ali Koşar Morteza Ghorbani Faculty of Engineering and Natural Science Sabanci UniversityTuzlaIstanbulTurkey Sabanci University Nanotechnology Research and Application Center TuzlaIstanbulTurkey Advanced NEMS Laboratory École Polytechnique Fédérale de Lausanne(EPFL)CH-1015LausanneSwitzerland Department of Biomedical Engineering and Health Systems KTH Royal Institute of TechnologySE-14157StockholmSweden Division of Solid State Electronics Department of Electrical EngineeringTheÅngström LaboratoryUppsala UniversityUppsalaSweden Center of Excellence for Functional Surfaces and Interfaces for Nano-Diagnostics(EFSUN) Sabanci UniversityOrhanliTuzlaIstanbulTurkey

Hydrodynamic cavitation is one of the major phase change phenomena and occurs with a sudden decrease in the local static pressure within a *** the emergence of microelectromechanical systems(MEMS),high-speed microfluidic devices have attracted considerable attention and been implemented in many fields,including cavitation *** this study,a new generation of‘cavitation-on-a-chip’devices with eight parallel structured microchannels is *** new device is designed with the motivation of decreasing the upstream pressure(input energy)required for facile hydrodynamic cavitation *** and a poly(vinyl alcohol)(PVA)microbubble(MB)suspension are used as the working *** results show that the cavitation inception upstream pressure can be reduced with the proposed device in comparison with previous studies with a single flow restrictive ***,using PVA MBs further results in a reduction in the upstream pressure required for cavitation *** this new device,different cavitating flow patterns with various intensities can be observed at a constant cavitation number and fixed upstream pressure within the same ***,cavitating flows intensify faster in the proposed device for both water and the water–PVA MB suspension in comparison to previous *** to these features,this next-generation‘cavitation-on-a-chip’device has a high potential for implementation in applications involving microfluidic/organ-on-a-chip devices,such as integrated drug release and tissue engineering.

关键词： cavitation bubble faster

Pyrolytic carbon resonators for micromechanical thermal analysis

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Microsystems & Nanoengineering 2019年第1期5卷 154-163页

作者： Long Quang Nguyen Peter Emil Larsen Tom Larsen Sanjukta Bose Goswami luis guillermo villanueva Anja Boisen Stephan Sylvest Keller DNRF and Villum Fonden Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics IDUNTechnical University of Denmark2800 Kgs LyngbyDenmark DTU Nanolab Technical University of Denmark2800 Kgs LyngbyDenmark DTU Health Tech Technical University of Denmark2800 Kgs LyngbyDenmark Advanced NEMS Laboratory Ecole Polytechnique Fédérale de Lausanne1015 LausanneSwitzerland

Thermal analysis is essential for the characterization of polymers and ***,the currently established methods require a large amount of ***,we present pyrolytic carbon resonators as promising tools for micromechanical thermal analysis(MTA)of nanograms of *** clamped pre-stressed beams with a resonance frequency of 233±4 kHz and a quality factor(Q factor)of 800±200 were *** of the electrical conductivity of the pyrolytic carbon allowed us to explore resistive heating for integrated temperature *** was achieved by monitoring the resonance frequency and quality factor of the carbon resonators with and without a deposited sample as a function of *** prove the potential of pyrolytic carbon resonators as thermal analysis tools,the glass transition temperature(T_(g))of semicrystalline poly(L-lactic acid)(PLLA)and the melting temperature(T_(m))of poly(caprolactone)(PCL)were *** results show that the T_(g) of PLLA and T_(m) of PCL are 61.0±0.8℃ and 60.0±1.0℃,respectively,which are in excellent agreement with the values measured by differential scanning calorimetry(DSC).

关键词： temperature carbon thermal

Woody plant taxonomic,functional,and phylogenetic diversity decrease along elevational gradients in Andean tropical montane forests:Environmental filtering and arrival of temperate taxa

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Plant Diversity 2024年第4期46卷 491-501页

作者： guillermo Bañares-de-Dios Manuel J.Macía Gabriel Arellano Íñigo Granzow-de la Cerda Julia Vega-álvarez Itziar Arnelas Carlos I.Espinosa Norma Salinas luis Cayuela Departamento de Biología y Geología Física y Química InorgánicaUniversidad Rey Juan CarlosCalle Tulipán s/nMóstolesMadridES-28933Spain Departamento de Biología Área de BotánicaUniversidad Autónoma de MadridCalle Darwin 2MadridES-28049Spain Centro de Investigación en Biodiversidad y Cambio Global(CIBC-UAM) Universidad Autónoma de MadridCalle Darwin 2MadridES-28049Spain Ecology and Evolutionary Biology University of MichiganAnn ArborMI 48109USA Oikobit LLC ***AlbuquerqueNM87120USA Real Jardín Botánico–CSIC Plaza Murillo 2MadridES-28014Spain Departamento de Biología Animal EcologíaParasitologíaEdafología y Química AgrícolaUniversidad de SalamancaCalle Donantes de Sangre s/nSalamancaES-37007Spain Departamento de Biodiversidad Ecología y EvoluciónUniversidad Complutense de MadridCalle JoséAntonio Nováis 12Ciudad UniversitariaES-28040Spain Departamento de Ciencias Biológicas y Agropecuarias Universidad Técnica Particular de LojaA.P.11-01-608 LojaEcuador Sección Química Pontificia Universidad Católica del PerúA.P.Lima 32LimaPeru ECI School of Geography and EnvironmentUniversity of OxfordOX13QYOxfordshireUnited Kingdom Instituto de Investigación en Cambio Global(IICG-URJC) Universidad Rey Juan CarlosCalle Tulipán s/nMóstolesMadridES-28933Spain

Mountains are paramount for exploring biodiversity patterns due to the mosaic of topographies and climates encompassed over short *** research has traditionally focused on taxonomic diversity when investigating changes along elevational gradients,but other facets should be *** first time,we simultaneously assessed elevational trends in taxonomic,functional,and phylogenetic diversity of woody plants in Andean tropical montane forests and explored their underlying ecological and evolutionary *** investigation covered four transects(traversing ca.2200 m a.s.l.) encompassing 114 plots of 0.1 ha across a broad latitudinal range(ca.10°).Using Hill numbers to quantify abundance-based diversity among 37,869 individuals we observed a consistent decrease in taxonomic,functional,and phylogenetic diversity as elevation increased,although the decrease was less pronounced for higher Hill *** exception was a slight increase in phylogenetic diversity when dominant species were *** decrease in taxonomic and functional diversity might be attributed to an environmental filtering process towards highlands,where the increasingly harsher conditions exclude species and functional ***,the differences in steepness decrease between Hill orders suggest that rare species disproportionately contribute to functional *** phylogenetic diversity the shifting elevational trend between Hill orders indicates a greater than previously considered influence in central Andean highlands of tropical lowlands originated species with strong niche conservatism relative to distantly related temperate *** could be explained by a decreasing presence and abundance of temperate,extratropical taxa towards the central Andes relative to northern or southern Andes,where they are more prevalent.

关键词： Altitudinal gradients Andes Environmentalﬁltering Out of the Tropical Lowlands Functional rarity Tropical Niche Conservatism

Correlation between Intestinal Health and Coccidiosis Prevalence in Broilers during Different Seasons of the Year in Brazil from 2012 to 2018

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Food and Nutrition Sciences 2024年第3期15卷 179-198页

作者： Fabio luis Gazoni Gabriela Miotto Galli Marcel Manente Boiago Lenita Moura Stefani Aline Zampar Marco A. Juárez-Estrada guillermo Tellez-Isaias Aleksandro S. da Silva Animal Health and Reproduction Veterinary Medicine Graduate Program Federal University of Santa Maria (UFSM) Santa Maria Brazil Animal Science Graduate Program Federal University of Rio Grande do Sul (UFRGS) Porto Alegre Brazil Animal Science Graduate Program Santa Catarina State University (UDESC) Chapecó Brazil Departamento de Medicina y Zootecnia de Aves Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autonoma de Mexico Ciudad Universitaria Ciudad de Mexico Mexico Department of Poultry Science Division of Agriculture University of Arkansas Fayetteville AR USA

Coccidiosis is a disease caused by intracellular protozoan parasites, specifically belonging to the genus Eimeria. These parasites target the gastrointestinal tract in different types of hosts, causing sores in the intestinal lining. The presence of these lesions reduces the animal’s ability to digest and absorb nutrients, significantly impacting their overall performance. The current study aimed to explore the potential correlation between seasonal variations and the incidence of Eimeria spp-induced lesions in broiler chickens’ gastrointestinal tracts in Brazil from 2012 to 2018. A total of 8,607 broiler chickens, aged 14 to 42 days, were sampled from 103 poultry integrated companies in Brazil to conduct intestinal health examinations. The sampling process involved selecting 3 to 6 chickens from each poultry house for examination. The assessment included various abnormalities such as shedding of intestinal cells and excessive fluid and mucus presence, thickening and tension of the intestines, food movement, roughened mucosal surface resembling a Turkish towel in the small intestine, tissue death, duodenal inflammation, intestinal inflammation, gizzard erosion, presence of worms and bedding material, and ingestion of mealworms. During the seasons, winter exhibited the highest average occurrence of Eimeria maxima microorganisms at 52.83%, with E. acervulina following closely at 26.42% in second place. In spring, E. maxima had an occurrence of 11.31%, while in fall, E. tenella had the lowest occurrence at 6.74%. When analyzing the seasonal occurrence of Eimeria, it was observed that E. maxima micro was more common during winter compared to summer (P = 0.0491). However, no discernible variation was observed in the occurrence of the remaining species across different seasons. Research findings suggest that subclinical coccidiosis is most prevalent during the winter season in Brazil. Likewise, clinical disease caused by E. acervulina is also prevalent during this time. I

关键词： Eimeria Epidemiology Intestinal Pathology Broiler Chickens Brazil

The Beneficial Effects of Components of Garlic (Allium sativum L.) in the Poultry Industry

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Food and Nutrition Sciences 2024年第1期15卷 27-57页

作者： Alejandra Meza-Rios Gilberto Velazquez-Juarez Inkar Castellanos-Huerta Rocio Ivette Lopez-Roa luis A. Anguiano-Sevilla Xochitl Hernanez-Velasco Xochitl Hernanez-Velasco Saeed El-Ashram Ebtsam Al-Olayan Billy Hargis guillermo Tellez-Isaias Adelaida Sara Minia Zepeda-Morales Departamento de Farmacobiología CUCEI Universidad de Guadalajara Blvd. M. García Barragán Guadalajara México Laboratorio de Análisis Fisicoquímicos Externos Departamento de Química CUCEI Universidad de Guadalajara Boulevard Marcelino García Barragán Guadalajara México Center of Excellence for Poultry Science Department of Poultry Science Dale Bumpers College of Agricultural Food and Life Sciences University of Arkansas Cumberland United States Laboratorio de Investigación y Desarrollo Farmacéutico Departamento de Farmacobiología CUCEI Universidad de Guadalajara Boulevard Marcelino García Barragán Guadalajara México Departamento de Medicina y Zootecnia de Aves Facultad de Medicina Veterinaria y Zootecnia UNAM Mexico Mexico Zoology Department Faculty of Science Kafrelsheikh University Kafr El-Sheikh Egypt Department of Zoology College of Science King Saud University Riyadh Saudi Arabia Laboratorio de Análisis Clínicos y Bacteriológicos (vinculación) Departamento de Farmacobiología CUCEI Universidad de Guadalajara Boulevard Marcelino García Barragán Guadalajara México

Plant-based antimicrobial agents are readily available, cost-effective, and exhibit low toxicity, making them promising alternatives in combatting microbial infections. Among these plants, garlic (Allium sativum) stands out for its traditional medicinal use in effectively combating various microorganisms. In the poultry industry, preventing avian virus and bacterial infections is paramount for chicken husbandry. However, using conventional drugs poses potential risks to human health. Garlic, a widely used Asian plant in traditional medicine for various pathologies, has shown potential as an herbal prophylactic remedy against viral and bacterial infections. Recently, researchers explored garlic and its derivatives as a scientific strategy in veterinary practices for diverse purposes, such as improving poultry production characteristics and acting as antibiotic growth promoters. This comprehensive review delves into garlic and its derivatives as preventive and corrective treatments for viral diseases in laying hens and broilers. The paper highlights their potential effectiveness and safety as a natural means to enhance poultry health and welfare while mitigating the risks associated with conventional drug usage in the food industry.

关键词： Garlic Antiviral Veterinary Chickens Allium sativum

加夫列尔·加西亚·马尔克斯图书馆,巴塞罗那,西班牙

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世界建筑 2024年第5期 76-81页

作者：无 Elena Orte guillermo Sevillano Marta Romero Jesús Lopez luis Sierra Ana Patricia Minguito Pablo Corroto María Abellán Sara Contreras RitaÁlvarez Tabio MiguelÁngel Maure Jesús Granada(摄影) SUMA建筑设计事务所不详

加布里埃尔·加西亚·马尔克斯图书馆是巴塞罗那的第40座图书馆,也是巴塞罗那30年计划的结晶。该计划旨在建立一个由优秀社区与区域设施组成的密集网络。这座图书馆位于圣马蒂德普罗旺斯区,为53,000人提供服务。关联式建筑图书馆被设计... 详细信息

加布里埃尔·加西亚·马尔克斯图书馆是巴塞罗那的第40座图书馆,也是巴塞罗那30年计划的结晶。该计划旨在建立一个由优秀社区与区域设施组成的密集网络。这座图书馆位于圣马蒂德普罗旺斯区,为53,000人提供服务。关联式建筑图书馆被设计成一座雕塑式实体建筑,让人联想到堆叠的书籍及其折叠的书页。该馆坐落在一处高架广场上,方便周围行人来往。同时,它又在空地上悬挑而出,门廊由现有的树木环绕,形成了一座城市大厅。不同大小及结构的开口定义了其不同立面与周围环境的关系。

关键词：巴塞罗那普罗旺斯周围环境加布里埃尔加西亚·马尔克斯图书馆关联式西班牙