Search results for: Vincent Garcia

Items from 1 to 16 out of 16 results

article

BiFeO₃ Nanoparticles: The “Holy‐Grail” of Piezo‐Photocatalysts?

Wafa Amdouni, Matthieu Fricaudet, Mojca Otoničar, Vincent Garcia, more

Advanced Materials > 35 > 31 > n/a - n/a

Recently, piezoelectric‐based catalysis has been demonstrated to be an efficient means and promising alternative to sunlight‐driven photocatalysis, where mechanical vibrations trigger redox reactions. Here, 60 nm‐size BiFeO₃ nanoparticles are shown to be very effective for piezo‐degrading Rhodamine B (RhB) model dye with record degradation rate reaching 13 810 L mol⁻¹ min⁻¹, and even 41 750 L mol⁻¹...

article

Interfacial Strain Gradients Control Nanoscale Domain Morphology in Epitaxial BiFeO₃ Multiferroic Films

Daniel Sando, Mengjiao Han, Vivasha Govinden, Oliver Paull, more

Advanced Functional Materials > 30 > 22 > n/a - n/a

Domain switching pathways fundamentally control performance in ferroelectric thin film devices. In epitaxial bismuth ferrite (BiFeO₃) films, the domain morphology is known to influence the multiferroic orders. While both striped and mosaic domains have been observed, the origins of the latter have remained unclear. Here, it is shown that domain morphology is defined by the strain profile across the...

article

Occurrence and clonal diversity of multidrug-resistant Klebsiella pneumoniae recovered from inanimate surfaces in Algerian hospital environment: First report of armA, qnrB and aac(6′)-Ib-cr genes

Karima Zenati, Farida Sahli, Vincent Garcia, Sofiane Bakour, more

Journal of Global Antimicrobial Resistance > 2017 > 10 > C > 148-153

The aim of this study is to characterize the molecular support of antibiotic resistance in MDR Klebsiella pneumoniae recovered from inanimate surfaces between March 2012 to February 2014 in three teaching hospitals (Setif, Bejaia and Constantine) in Algeria.Forty-four K. pneumoniae producing ESBL were detected and bla_CTX-M-15 and bla_CTX-M-3 were detected respectively in 41 and 3 isolates. These K...

article

Enterococcus faecalis urinary-tract infections: Do they have a zoonotic origin?

Cédric Abat, Michael Huart, Vincent Garcia, Grégory Dubourg, more

Journal of Infection > 2016 > 73 > 4 > 305-313

Major human pathogens are frequently isolated from meat-producing animals, particularly poultry. Among them is Enterococcus faecalis, which is known to be one of the main cause of human urinary-tract infections worldwide. Early in 2015, we detected several, consecutive abnormal increases in the weekly number of human E. faecalis infections in various medical settings in the Provence-Alpes-Côte d'Azur...

chapter

Searching High-Dimensional Neighbours: CPU-Based Tailored Data-Structures Versus GPU-Based Brute-Force Method

Vincent Garcia, Frank Nielsen

Lecture Notes in Computer Science > Computer Vision/Computer Graphics CollaborationTechniques > 425-436

Many image processing algorithms rely on nearest neighbor (NN) or on the k nearest neighbor (kNN) search problem. Several methods have been proposed to reduce the computation time, for instance using space partitionning. However, these methods are very slow in high dimensional space. In this paper, we propose a fast implementation of the brute-force algorithm using GPU (Graphics Processing Units)...

chapter

Levels of Details for Gaussian Mixture Models

Vincent Garcia, Frank Nielsen, Richard Nock

Lecture Notes in Computer Science > Computer Vision – ACCV 2009 > Poster Session 2: Segmentation, Detection, Color and Texture > 514-525

Mixtures of Gaussians are a crucial statistical modeling tool at the heart of many challenging applications in computer vision and machine learning. In this paper, we first describe a novel and efficient algorithm for simplifying Gaussian mixture models using a generalization of the celebrated k-means quantization algorithm tailored to relative entropy. Our method is shown to compare experimentally...

chapter

Simplifying Gaussian mixture models via entropic quantization

Frank Nielsen, Vincent Garcia, Richard Nock

2009 17th European Signal Processing Conference > 2012 - 2016

2009 17th European Signal Processing Conference

Mixture models are a crucial statistical modeling tool at the heart of many challenging applications in computer vision, machine learning, and text classification among others. In this paper, we describe a novel and efficient algorithm for simplifying Gaussian mixture models using a generalization of the celebrated k-means quantization algorithm tailored to relative entropy in statistical distribution...

article

Artificial multiferroic heterostructures for an electric control of magnetic properties

Vincent Garcia, Manuel Bibes, Agnès Barthélémy

Comptes rendus - Physique > 2015 > 16 > 2 > 168-181

The control of magnetism by electric fields is an important goal for future low-power spintronics devices. This partly explains the intensified recent interest for magnetoelectric multiferroic materials and heterostructures. The lack of ferro- or ferrimagnetic–ferroelectric materials with large magnetoelectric coupling between the two orders has spurred intensive research on artificial multiferroics...

article

Potential measurement to determine the chloride threshold concentration that initiates corrosion of reinforcing steel bar in slag concretes

Vincent Garcia, Raoul François, Myriam Carcasses, Philippe Gegout

Materials and Structures > 2014 > 47 > 9 > 1483-1499

The chloride content at which reinforcement corrosion occurs (Ccrit) is an important parameter for the determination of the service life of a concrete structure. Many studies have been conducted on Portland cement concrete but few data are available concerning slag concrete. In this study, a method for determining the Ccrit value is proposed. It uses capillary suction and a diffusion phase with steel-potential...

article

Randomized trial of transversus abdominis plane block at total laparoscopic hysterectomy: effect of regional analgesia on quality of recovery

Sarah M. Kane, Vincent Garcia-Tomas, Marilyn Alejandro-Rodriguez, Brendan Astley, more

American Journal of Obstetrics and Gynecology > 2012 > 207 > 5 > 419.e1-419.e5

The objective of the study was to determine whether transversus abdominis plane (TAP) block improves the early postoperative quality of recovery (QoR-40). The secondary objectives measured postoperative pain, length of stay, and narcotic use. This was a randomized, single-blinded trial of TAP block versus no block on women undergoing laparoscopic hysterectomy. TAP block patients received 20 mL...

article

Structural and Dielectric Properties of SnTiO ₃ , a Putative Ferroelectric

Thomas Fix, S.-Lata Sahonta, Vincent Garcia, Judith L. MacManus-Driscoll, more

Crystal Growth & Design > 2011 > 11 > 5 > 1422 - 1426

article

Evaluation of Registration Methods on Thoracic CT: The EMPIRE10 Challenge

Keelin Murphy, Bram van Ginneken, Joseph M. Reinhardt, Sven Kabus, more

IEEE Transactions on Medical Imaging > 2011 > 30 > 11 > 1901 - 1920

<?Pub Dtl?>EMPIRE10 (Evaluation of Methods for Pulmonary Image REgistration 2010) is a public platform for fair and meaningful comparison of registration algorithms which are applied to a database of intrapatient thoracic CT image pairs. Evaluation of nonrigid registration techniques is a nontrivial task. This is compounded by the fact that researchers typically test only on their own data,...

chapter

K-nearest neighbor search: Fast GPU-based implementations and application to high-dimensional feature matching

Vincent Garcia, Éric Debreuve, Frank Nielsen, Michel Barlaud

2010 IEEE International Conference on Image Processing > 3757 - 3760

2010 17th IEEE International Conference on Image Processing (ICIP 2010)

The k-nearest neighbor (kNN) search problem is widely used in domains and applications such as classification, statistics, and biology. In this paper, we propose two fast GPU-based implementations of the brute-force kNN search algorithm using the CUDA and CUBLAS APIs. We show that our CUDA and CUBLAS implementations are up to, respectively, 64X and 189X faster on synthetic data than the highly optimized...

chapter

Outer-Layer Based Tracking using Entropy as a Similarity Measure

Vincent Garcia, Sylvain Boltz, Eric Debreuve, Michel Barlaud

2007 IEEE International Conference on Image Processing > 6 > VI - 309 - VI - 312

2007 IEEE International Conference on Image Processing, ICIP 2007

Tracking can be achieved using region active contours based on homogeneity models (intensity, motion...). However the model complexity necessary to achieve a given accuracy might be prohibitive. Methods based on salient points may not extract enough of these for reliable motion estimation if the object is too homogeneous. Here we propose to compute the contour deformation based on its neigh-borhood...

article

Synthesis and characterization of a new layered magnesium zinc phosphate hydrate

Azzedine Bensalem, Vincent Garcia, Mahieddine Yahiouche

Materials Research Bulletin > 2007 > 42 > 1 > 165-170

A new layered magnesium zinc phosphate hydrate, MgZn(HPO ₄ ) ₂ ·H ₂ O, with a zinc phosphate framework isostructural with the one of Na ₂ Zn(HPO ₄ ) ₂ ·4H ₂ O, was prepared by the direct ambient pressure and temperature reaction between zinc 2,4-pentanedionate, phosphoric acid and hexahydrated magnesium chloride. The as-prepared sample is monoclinic...

article

Guidelines for pediatric equipment and supplies for emergency departments

Committee on Pediatric Equipment and Supplies for Emergency Departments, National Emergency Medical Services for Children Resource Alliance, James Seidel, Susan Title, more

Journal of Emergency Nursing > 1998 > 24 > 1 > 45-48

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