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Ultra-low loss silicon nitride becomes even cooler

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Light(Science & Applications) 2024年第10期13卷 1997-1999页

作者： Dawn T.H.Tan xavier X.Chia Photonics Devices and Systems Group Singapore University of Technology andDesignSingaporeSingapore institute of Microelectronics Agency for Science Technology and Research(A*STAR)SingaporeSingapore

Ultra-low loss silicon nitride realized using deuterated precursors and low thermal budgets well within backend-of-line CMOS processing may accelerate widespread proliferation of their use.

关键词： low budget nitride

The effects of step inclination and air injection on the water flow in a stepped spillway:A numerical study

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Journal of Hydrodynamics 2017年第2期29卷 322-331页

作者： Khadidja Kherbache xavier Chesneau Belkacem Zeghmati Stéphane Abide Saadia Benmamar Universite de Perpignan Via Domitia(UPVD) LAhoratoire the Mathematiques et de PhySique(LAMPS)EA4217F-66860PerpignanFrance Ecole Nationale Polytechnique Laboratoire de Recherche des Sciences de I'eau10 Avenue Hassen Badi16000 AlgerAlgerie

In this work, we perform a numerical study of a water flow over a stepped spillway. This flow is described by the Reynolds averaged Navier-Stokes equation （RANS） associated with the turbulence k - model. These equations are solved using a commercial software based on the finite volume scheme and an unstructured mesh. The air-water flow was modeled using volume of fluid （VOF） and multiphasic methods. The characteristics of the profile, etc.. We analyze the effects on the flow structure of the flow were investigated including the total pressure, the velocity steps and countermarch inclination, the air injection through the countermarch into the water flow and the dynamics water discharges. Results show that the inclination of the countermarch relative to the vertical and the air injection into the water flow increase the total pressure in the neighbourhood of the steps.

关键词： Stepped spillway turbulence air-water air injection volume of fluid (VOF) method multiphasic method

Impact of time between meniscal injury and isolated meniscus repair on post-operative outcomes:A systematic review

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World Journal of Clinical Cases 2025年第7期13卷 39-45页

作者： Kashif Javid xavier Akins Nicole G Lemaster Amer Ahmad Austin V Stone Department of Orthopaedic Surgery and Sports Medicine University of KentuckyLexingtonKY 40504United States

BACKGROUND Meniscal tears are one of the most common knee *** the diagnosis of a meniscal tear has been made,there are several factors physicians use to guide clinical *** influence of time between injury and isolated meniscus repair on patient outcomes is not well *** this relationship is important as it may influence clinical decision-making and can add to the preoperative patient education *** hypothesized that increasing the time from injury to meniscus surgery would worsen postoperative *** To investigate the current literature for data on the relationship between time between meniscus injury and repair on patient *** PubMed,Academic Search Complete,MEDLINE,CINAHL,and SPORTDiscus were searched for studies published between January 1,1995 and July 13,2023 on isolated meniscus *** criteria included concomitant ligament surgery,incomplete outcomes or time to surgery data,and *** demographics,time to injury,and postoperative outcomes from each study were abstracted and *** Five studies met all inclusion and exclusion *** were 204(121 male,83 female)patients *** of five(60%)studies determined that time between injury and surgery was not statistically significant for postoperative Lysholm scores(P=0.62),Tegner scores(P=0.46),failure rate(P=0.45,P=0.86),and International Knee Documentation Committee scores(P=0.65).Two of five(40%)studies found a statistically significant increase in Lysholm scores with shorter time to surgery(P=0.03)and a statistically significant association between progression of medial meniscus extrusion ratio(P=0.01)and increasing time to *** Our results do not support the hypothesis that increased time from injury to isolated meniscus surgery worsens postoperative ***-making primarily based on injury interval is thus not recommended.

关键词： Meniscus Meniscal Meniscus repair Meniscectomy Patient reported outcomes Postoperative outcomes Time to surgery Injury interval

Carboxymethyl cellulose thiol-imprinted polymers:Synthesis, characterization and selective Hg(Ⅱ) adsorption

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Journal of Environmental Sciences 2019年第5期31卷 280-296页

作者： Tarisai Velempini Kriveshini Pillay xavier Y.MbiANDa Omotayo A.Arotiba Department of Applied Chemistry University of Johannesburg Doornfontein Campus Centre for Nanomaterials University of Johannesburg Doornfontein Campus Department of Science and Technology/National Research Foundation Centre of Excellence in Strong Materials University of the Witwatersrand

Sulfur containing ion imprinted polymers(S-IIPs) were applied for the uptake of Hg(Ⅱ) from aqueous solution. Cysteamine which was used as the ligand for Hg(Ⅱ) complexation, was grafted along the epichlorohydrin crosslinked carboxylated carboxymethyl cellulose polymer chain through an amide reaction. The adsorption ability of S-IIPs towards Hg(Ⅱ)was investigated by kinetic and isotherm models, which, corresponding, showed that the adsorption process followed a pseudo-second-order, fitted well with the Langmuir isotherm with a maximum adsorption capacity of 80 mg/g. Moreover, thermodynamic studies indicated an endothermic and spontaneous reaction with the tendency of an enhanced randomness at the surface of the S-IIPs with temperature increases. S-IIPs indicated a high degree of selectivity towards Hg(Ⅱ) in the presence of Cu^(2+), Zn^(2+), Co^(2+), Pb^(2+)and Cd^(2+).Furthermore, the efficiency of S-IIPs was also evaluated against real samples showing86.78%, 91.88%, and 99.10% recovery for Hg(Ⅱ) wastewater, ground water and tap water,respectively. In this study, the adsorbent was successfully regenerated for five cycles, which allows for their reuse without significant loss of initial adsorption capability.

关键词： Ion-imprinted polymers Carboxymethyl cellulose Adsorption Mercury(Ⅱ) Thiol

Machine perfusion strategies in liver transplantation

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Hepatobiliary Surgery and Nutrition 2019年第5期8卷 490-501页

作者： Andrea Schlegel xavier Muller Philipp Dutkowski Liver Unit Queen Elizabeth HospitalUniversity Hospitals Birmingham NHS Foundation TrustBirminghamUK Centre for Liver and Gastrointestinal Research Institute of Immunology and ImmunotherapyCollege of Medical and Dental SciencesUniversity of BirminghamBirminghamUK Department of Surgery and Transplantation University Hospital ZurichZurichSwitzerland

Machine perfusion is a hot topic in liver transplantation and several new perfusion conceptsare currently *** to introduction into routine clinical practice,however,such perfusionapproaches need to demonstrate their impact on liver function,post-transplant complications,utilizationrates of high-risk organs,and cost ***,based on results of experimental and clinical studies,the community has to recognize the limitations of this *** this review,we summarize currentperfusion concepts and differences between protective mechanisms of ex-and in-situ perfusion ***,we discuss which graft types may benefit most from perfusion techniques,and highlight the currentunderstanding of liver viability ***,we present results from recent clinical trials involvingmachine liver perfusion,and analyze the value of different outcome parameters,currently used as endpointsfor randomized controlled trials in the field.

关键词： Machine perfusion clinical trials viability assessment

On the relationship between hypsodonty and longevity in Myotragus balearicus–A comment on van der Geer (2014)

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Integrative Zoology 2015年第2期10卷 227-229页

作者： xavier JORDANA Daniel DeMIGUEL Meike KÖHLER Catalan Institute of Paleontology Miquel Crusafont Autonomus University of BarcelonaBarcelonaSpain Catalan Institution for Research and Advanced Studies(ICREA)at Catalan Institute of Paleontology Miquel Crusafont Autonomus University of BarcelonaBarcelonaSpain Department of Ecology University of BarcelonaBarcelonaSpain

In a recent paper published in a special issue of Integrative Zoology on‘Paleontology and evolution–part I.’(Palombo 2014),the author(van der Geer 2014)takes a review of the derived traits observed in endemic fossil insular mammals,including body size variation,cranial and postcranial changes,and modifications in *** one point in the discussion,the author misinterprets and seriously distorts statements by Jordana et al.(2012)on the relationship between hypsodonty and longevity in the fossil insular bovid Myotragus balearicus Bate,1909.

关键词： dont dis longe

An Intelligent Intrusion Detection System in Smart Grid Using PRNN Classifier

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Intelligent Automation & Soft Computing 2023年第3期35卷 2979-2996页

作者： P.Ganesan S.Arockia Edwin xavier Department of Electrical and Electronics Engineering Government College of EngineeringSrirangamTrichy620012India Department of Electrical and Electronics Engineering Thiagarajar College of EngineeringMadurai625015India

Typically,smart grid systems enhance the ability of conventional power system networks as it is vulnerable to several kinds of *** vulnerabil-ities might cause the attackers or intruders to collapse the entire network system thus breaching the conﬁdentiality and integrity of smart grid ***,for this purpose,Intrusion detection system(IDS)plays a pivotal part in offering a reliable and secured range of services in the smart grid *** exist-ing approaches are there to detect the intrusions in smart grid framework,however they are utilizing an old dataset to detect anomaly thus resulting in reduced rate of detection accuracy in real-time and huge data *** as to overcome these limitations,the proposed technique is presented which employs both real-time raw data from the smart grid network and KDD99 dataset thus detecting anoma-lies in the smart grid *** the grid side data acquisition,the power trans-mitted to the grid is checked and enhanced in terms of power quality by eradicating distortion in transmission *** this approach,power quality in the smart grid network is enhanced by rectifying the fault using a FACT device termed UPQC(Uniﬁed Power Quality Controller)and thereby storing the data in cloud *** data from smart grid cloud storage and KDD99 are pre-pro-cessed and are optimized using Improved Aquila Swarm Optimization(IASO)to extract optimal *** probabilistic Recurrent Neural Network(PRNN)classiﬁer is then employed for the prediction and classiﬁcation of *** last,the performance is estimated and the outcomes are projected in terms of grid voltage,grid current,Total Harmonic Distortion(THD),voltage sag/swell,accu-racy,precision,recall,F-score,false acceptance rate(FAR),and detection rate of the classiﬁ*** analysis is compared with existing techniques to validate the proposed model efﬁciency.

关键词： Intrusion detection system anomaly detection smart grid power quality enhancement uniﬁed power quality controller harmonics elimination fault rectiﬁcation improved aquila swarm optimization detection rate

Monotonic Diamond and DDFV Type Finite-Volume Schemes for 2D Elliptic Problems

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Communications in Computational Physics 2023年第7期34卷 456-502页

作者： xavier Blanc Francois Hermeline Emmanuel Labourasse Julie Patela UniversitéParis Cité Sorbonne UniversitéCNRSLaboratoire Jacques-Louis LionsF-75013 ParisFrance CEA DAMDIFF-91297 ArpajonFrance UniversitéParis-Saclay CEA DAM DIFLaboratoire en Informatique Haute Performance pour le Calcul et la Simulation91297 ArpajonFrance

The DDFV(Discrete Duality Finite Volume)method is a finite volume scheme mainly dedicated to diffusion problems,with some outstanding *** scheme has been found to be one of the most accurate finite volume methods for diffusion *** the present paper,we propose a new monotonic extension of DDFV,which can handle discontinuous tensorial diffusion ***,we compare its performance to a diamond type method with an original interpolation method relying on polynomial *** is achieved by adapting the method of Gao et al[A finite volume element scheme with a monotonicity correction for anisotropic diffusion problems on general quadrilateral meshes]to our *** a technique does not require the positiveness of the secondary *** show that the two new methods are second-order accurate and are indeed monotonic on some challenging benchmarks as a Fokker-Planck problem.

关键词： Finite volume method anisotropic diffusion monotonic method DDFV scheme

Developing spatially and thematically detailed backdated maps for land cover studies

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International Journal of Digital Earth 2017年第2期10卷 175-206页

作者： Juan JoséVidal-Macua Alaitz Zabala Miquel Ninyerola xavier Pons Dep Geografia Grumets Research GroupUniversitat Autònoma de BarcelonaBellaterraCataloniaSpain Dep Biologia Animal Vegetal i EcologiaGrumets Research GroupUniversitat Autònoma de BarcelonaBellaterraCataloniaSpain

Global or regional land cover change on a decadal time scale can be studied at a high level of detail using the availability of remote sensing data such as that provided by ***,there are three main technical challenges in this ***,the generation of land cover maps without reference data is problematic(backdating).Second,it is important to maintain high accuracies in land cover change map products,requiring a reasonably rich legend within each ***,a high level of automation is necessary to aid the management of large volumes of *** paper describes a robust methodology for processing time series of satellite data over large spatial *** methodology includes a retrospective analysis used for the generation of training and test data for historical periods lacking reference *** methodology was developed in the context of research on global change in the Iberian *** this study we selected two scenes covering geographic regions that are representative of the Iberian *** each scene,we present the results of two classifications(1985-1989 and 2000-2004 quinquennia),each with a legend of 13 *** overall accuracy of over 92%was obtained for all 4 maps.

关键词： Land cover mapping Landsat statistical classifiers backdating Iberian Peninsula