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Engineering polymer MEMS using combined microfluidic pervaporation and micro-molding

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Microsystems & Nanoengineering 2018年第1期4卷 270-277页

作者： damien Thuau Cédric Laval Isabelle dufour Philippe Poulin Cédric Ayela Jean-Baptiste Salmon Laboratoire IMS University of BordeauxUMR 5218ENSCBP16 avenue Pey Berland33607 PessacFrance Centre National de Recherche Scientifique University of BordeauxSolvayLOFUMR 525833600 PessacFrance Centre de Recherche Paul Pascal University of BordeauxAvenue Schweitzer33600 PessacFrance

In view of the extensive increase of flexible devices and wearable electronics,the development of polymer microelectro-mechanical systems(MEMS)is becoming more and more important since their potential to meet the multiple needs for sensing applications in flexible electronics is now clearly ***,polymer micromachining for MEMS applications is not yet as mature as its silicon counterpart,and innovative microfabrication techniques are still *** show in the present work an emerging and versatile microfabrication method to produce arbitrary organic,spatially resolved multilayer micro-structures,starting from dilute inks,and with possibly a large choice of *** approach consists in extending classical microfluidic pervaporation combined with MIcro-Molding In *** illustrate the potential of this technique,bilayer polymer double-clamped resonators with integrated piezoresistive readout have been fabricated,characterized,and applied to humidity *** present work opens new opportunities for the conception and integration of polymers in MEMS.

关键词： polymer dilute starting

Three-dimensional simulation of horseshoe vortex and local scour around a vertical cylinder using an unstructured finite-volume technique

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International Journal of Sediment Research 2020年第3期35卷 295-306页

作者： Wei Zhang Miguel Uh Zapata Xin Bai damien Pham-Van-Bang Kim dan Nguyen Laboratory for Hydraulics Saint-Venant (LHSV ENPC-EDF R&D-Cerema)University Paris-Est CONACYT Centro de Investigacion en Matematicas A.C.(CIMAT)Unidad Merida 3. Laboratory for Hydraulics and Environment (LHE)Institut National de La Recherche ScientifiqueUniversite Du Quebec

A Large Eddy Simulation model is developed to simulate the hydrodynamics and scour process around a circular *** Navier-Stokes solver is based on the projection method and a second-order unstructured finite-volume method.A sigma-coordinate system is used to obtain an accurate representation of the evolution of the sediment-water *** erosion is simulated by solving the sediment continuity equation using a mass-conservating sand-slide algorithm and a bedload transport rate,which is based on a description of physical processes(Engelund & Freds(?)e,1976).Simulations of flow around a vertical cylinder for free-slip bed,rigid bed,and live-bed cases are *** mean velocity profile and shear stress validate the accuracy of this *** vortex and lee-wake vortex shedding structure are simulated,and the results are thoroughly discussed in *** formation and the temporal development of the scour hole and other topographic bed features are successfully *** current paper reports the first known investigation of both scour evolution and coherent structure using large-eddy simulation.

关键词： Non-hydrostatic flows Horseshoe vortex Wake region Scouring Bedload transport

Micro 3d printing of a functional MEMS accelerometer

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Microsystems & Nanoengineering 2022年第5期8卷 69-79页

作者： Simone Pagliano david E.Marschner damien Maillard Nils Ehrmann Göran Stemme Stefan Braun Luis Guillermo Villanueva Frank Niklaus KTH Royal Institute of Technology Division of Micro and NanosystemsMalvinas väg 10StockholmSweden École Polytechnique Fédérale de Lausanne(EPFL) Advanced NEMS LaboratoryInstitute of Mechanical Engineering1015 LausanneSwitzerland Hochschule Kaiserslautern University of Applied SciencesInformatik und MikrosystemtechnikCampus ZweibrückenGermany

Microelectromechanical system(MEMS)devices,such as accelerometers,are widely used across industries,including the automotive,consumer electronics,and medical *** are efficiently produced at very high volumes using large-scale semiconductor manufacturing ***,these techniques are not viable for the costefficient manufacturing of specialized MEMS devices at low-and medium-scale ***,applications that require custom-designed MEMS devices for markets with low-and medium-scale volumes of below 5000–10,000 components per year are extremely difficult to address *** 3d printing of MEMS devices could enable the efficient realization and production of MEMS devices at these low-and medium-scale ***,current micro-3d printing technologies have limited capabilities for printing functional ***,we demonstrate a functional 3d-printed MEMS accelerometer using 3d printing by two-photon polymerization in combination with the deposition of a strain gauge transducer by metal *** characterized the responsivity,resonance frequency,and stability over time of the MEMS *** results demonstrate that the 3d printing of functional MEMS is a viable approach that could enable the efficient realization of a variety of custom-designed MEMS devices,addressing new application areas that are difficult or impossible to address using conventional MEMS manufacturing.

关键词： printing accelerometer functional

Hydrothermal Synthesis and Characterization of Europium-doped Barium Titanate Nanocrystallites

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Nano-Micro Letters 2013年第1期5卷 57-65页

作者： Margarita García-Hernndez Geneviève Chadeyron damien Boyer Antonieta García-Murillo Felipe Carrillo-Romo Rachid Mahiou Universidad Autónoma Metropolitana Departamento de Ciencias NaturalesDCNIUnidad CuajimalpaPedro Antonio de los Santos 8411850 Mxico D.F. Mxico Clermont Universit Institut de Chimie de Clermont-Ferrand UMR 6296CNRS/UBP/ENSCCFBP 10448F-63000 Clermont-Ferrand Instituto Politcnico Nacional CIITEC IPNCerrada de Cecati S/N. Col. Santa CatarinaAzcapotzalco Mxico D.F. C.P. 02250Mxico

Barium titanate nanocrystallites were synthesized by a hydrothermal technique from barium chloride and tetrabutyl titanate. Single-crystalline cubic perovskite Ba TiO_3 consisting of spherical particles with diameters ranging from 10 to 30 nm was easily achieved by this route. In order to study the influence of the synthesis process on the morphology and the optical properties, barium titanate was also prepared by a solid-state reaction. In this case, only the tetragonal phase which crystallizes above 900 was observed. High-temperature X-ray diffraction measurements were performed to investigate the crystallization temperatures as well as the particle sizes via the Scherrer formula. The lattice vibrations were evidenced by infrared spectroscopy. Eu^(3+)was used as a structural probe, and the luminescence properties recorded from Ba TiO_3 :Eu^(3+)and elaborated by a solid-state reaction and hydrothermal process were compared. The reddish emission of the europium is increased by the nanometric particles.

关键词： BaTiO3 Europium Nanocrystallites Hydrothermal technique

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Lock-in incoherent differential phase contrast imaging

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Photonics Research 2022年第1期10卷 237-247页

作者： CHIARA BONATI damien LOTERIE TIMOTHé LAFOREST CHRISTOPHE MOSER Laboratory of Applied Photonics devices School of EngineeringEcole Polytechnique Fédérale de Lausanne1015 LausanneSwitzerland

We introduce a lock-in method to increase the phase contrast in incoherent differential phase contrast(dPC)*** method improves the phase sensitivity by the analog removal of the *** use of a smart pixel detector with in-pixel signal demodulation,paired with synchronized switching illumination,provides the basis of a bit-efficient approach to emulate a lock-in *** experiments show an increased sensitivity by a factor of up to 8,as expected from theory,and a reduction of collected data by a factor of 70,for equivalent standard dPC measurements;single-shot sensitivity of 0.7 mrad at a frame rate of 1400 frames per second is *** new approach may open the way for the use of incoherent phase microscopy in biological applications where extreme phase sensitivity and millisecond response time are required.

关键词： phase illumination differential

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A large-scale phylogenetic revision of Roccellaceae(Arthoniales)reveals eight new genera

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Fungal diversity 2015年第1期70卷 31-53页

作者： damien Ertz Anders Tehler Martin Irestedt Andreas Frisch Göran Thor Pieter van den Boom Jardin Botanique National de Belgique Département Bryophytes-ThallophytesDomaine de Bouchout1860 MeiseBelgium Naturhistoriska riksmuseet Enheten för botanikBox 5000710405 StockholmSweden Naturhistoriska riksmuseet Enheten för bioinformatik och genetikBox 5000710405 StockholmSweden department of Botany National Museum of Nature and Science4-1-1 AmakuboTsukuba-CityIbarakiJapan 305-0005 department of Ecology Swedish University of Agricultural SciencesP.O.Box 704475007 UppsalaSweden Arafura 16 5691 JA SonThe Netherlands

A two-locus phylogenetic hypothesis of the family Roccellaceae is presented based on data from the nuclear ribosomal large subunit(nucLSU)and the second largest subunit of RNA polymerase II(RPB2).This analysis includes 341 sequences(166 newly generated)and 180 specimens representing about 114 *** genera Lecanactis,Roccellina,Schismatomma and Sigridea were found to be paraphyletic/*** order to make these groups monophyletic,the new genera Crocellina,diromma,Gyrographa,Gyronactis,Ocellomma,Pseudoschismatomma,Psoronactis and Vigneronia are *** genus Sagenidium is placed in synonymy with *** new species Enterographa incognita,Gyronactis asiatica and Lecanactis submollis are *** species of Opegrapha are transferred to the *** morphs are recorded for the first time in the genus Syncesia.

关键词： Arthoniomycetes Lichenized fungi Molecular phylogenetics New genera Taxonomy

In-situ measurement on air-water flux of CH_(4),CO_(2) and their carbon stable isotope in lakes of northeast Tibetan Plateau

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Advances in Climate Change Research 2022年第2期13卷 279-289页

作者： Lei WANG Cun-de XIAO Zhi-Heng dU damien T.MAHER Jing-Feng LIU Zhi-Qiang WEI State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Southern Cross Geoscience Southern Cross UniversityLismoreNSW 2480Australia College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China Zhuhai Branch of State Key Laboratory of Earth Surface Process and Resource Ecology Beijing Normal UniversityZhuhai 519087China

Inland waters are important sources of greenhouse gases(GHGs)to the atmosphere that may partially offset the terrestrial carbon ***,GHG emissions from high altitude saline lakes on the Tibetan Plateau are currently poorly *** this study,we measured methane(CH_(4))and carbon dioxide(CO_(2))concentrations and their carbon stable isotope(δ13C),and calculated diffusive water-to-air fluxes from two saline high-altitude lakes,Qinghai Lake and Hala Lake,located in northeast Tibetan Plateau in October *** two lakes were mostly supersaturated in CH_(4)(89.8%-4623.9%sat)and acted as sources of CH_(4) to the ***,more than 96%investigated area of Qinghai Lake and all investigated area of Hala Lake was a sink of CO_(2).The average diffusive fluxes of CH_(4) and CO_(2) in the surface waters of Qinghai Lake were 34.51μmol m−2 d−1 and−1.29 mmol m−2 d−1,while diffusive fluxes of CH_(4) and CO_(2) in Hala Lake averaged 5.48μmol m−2 d−1 and−5.24 mmol m−2 d−1,***(Sal),fluorescent dissolved organic matter(fdOM),temperature(Temp)and dissolved oxygen(dO)are key factors for diffusive CH_(4) and CO_(2) flux in Qinghai Lake and Hala ***_(4) diffusive fluxes across water-air interface from Qinghai Lake and Hala Lake were found to be significantly lower than other freshwater lakes,likely due to their saline nature.A simple isotope mixing model(Miller-Tans plots)revealed a distinctly different isotopic source values of CO_(2) and CH_(4) in Qinghai Lake and Hala *** CH_(4) production pathway of Qinghai Lake was mainly by the acetate fermentation,while that of Hala Lake was mainly by the CO_(2) *** results show that the continuous measurement can help capture the spatial variability of GHGs fluxes in saline lakes.

关键词： Greenhouse gas Air-water flux Carbon stable isotope Tibetan Plateau Saline lakes

IMPACT de la déprivation sociale sur les difficultés psychosociales au décours d’un cancer pédiatrique:uneétude prospective IMPACT of the Social deprivation on Psychosocial difficulties of Pediatric Cancer Survivors:A Prospective Study

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Psycho-Oncologie 2024年第2期18卷 117-126页

作者： Fanny delehaye Olivier dejardin Isabelle Pellier Ludivine Launay Maxime Esvan damien Bodet Liana Carausu Julien Lejeune Frédéric Millot Caroline Thomas Virginie Gandemer Arnaud Alves Julien Rod U1086 INSERM“Anticipe” Caen14000France department of Pediatric Hematology and Oncology University Hospital of CaenCaen14000France Research department University Hospital of CaenCaen cedex14000France department of Pediatric Hematology and Oncology University Hospital of AngersAngers49000France Centre François Baclesse Caen14000France CIC 1414(Centre d’Investigation Clinique de Rennes) Rennes UniversityCHU RennesInsermRennes35000France department of Pediatric Hematology and Oncology University Hospital of BrestBrest29200France department of Pediatric Hematology-Oncology Clocheville HospitalUniversity Hospital of ToursTours37000France Pediatric Oncology Unit CIC 802 INSERMUniversity Hospital of PoitiersPoitiers86000France department of Pediatric Hematology-Oncology University Hospital of NantesNantes44000France department of Pediatric Hematology and Oncology University Hospital of RennesRennes35000France Service de Chirurgie digestive CHU CaenUniversitéde Caen-NormandieCaen14000France department of Pediatric Surgery Caen University HospitalAvenue de la Côte de NacreCaen14000France

The posttreatment period is a key part of the management of pediatric *** this time,school and psychological difficulties have been described in childhood cancer survivors(CCS)and can be prognostic for the success of social *** study estimated the inﬂuence of the household’s socioeconomic status(SES)on these psychosocial *** study is based on a prospective multicentric database and focused on children who received a psychosocial evaluation during their follow-up from 2013 to *** retrieved data on school and psychological *** SES was estimated by a social deprivation *** from1003 patients were *** difficulties were noted in 22%of CCS.A greater social deprivation was significantly associated with school *** relapse,treatment with hematopoietic stem cell transplantation,and central nervous system(CNS)tumors remained significant risk *** the subgroup of CNS tumors,school difficulties were increased and associated with greater social *** difficulties were not associated with the deprivation *** is a link between SES and school difficulties in *** investigations should be carried out for children with CNS tumors,which is the population of the greatest concern.

关键词： Psychosocial difficulties contextual socioeconomic status deprivation cancer children