Search

Your search keyword '"ANR-11-IDEX-0007"' showing total 9 results
Start Over Author "ANR-11-IDEX-0007" Publisher elsevier bv
9 results on '"ANR-11-IDEX-0007"'

1. Lateral extra-articular reconstruction length changes during weightbearing knee flexion and pivot shift: A simulation study

Author

Mathieu Thaunat, Jacques A. de Guise, Adnan Saithna, Yoann Blache, Biova Kouevidjin, Raphaël Dumas, Bertrand Sonnery-Cottet, Laboratoire Interuniversitaire de Biologie de la Motricité (LIBM ), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Group Ramsay-générale de santé, Centre orthopédique Santy , hôpital privé Jean-Mermoz, Laboratoire de recherche en imagerie et orthopédie [Montréal] (LIO), Ecole de Technologie Supérieure [Montréal] (ETS)-Centre Hospitalier de l'Université de Montréal (CHUM), Université de Montréal (UdeM)-Université de Montréal (UdeM), Laboratoire de Biomécanique et Mécanique des Chocs (LBMC UMR T9406), Université de Lyon-Université de Lyon-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), Southport and Ormskirk Hospitals, Centre orthopédique Santy, hôpital privé Jean-Mermoz, and this workwas performed within the framework of the LABEX PRIMES (ANR-11-LABX-0063) of Université de Lyon, within the 'Investissementsd'Avenir' program (ANR-11-IDEX-0007) operated by the FrenchNational Research Agency (ANR). The study was supported by the'Ramsay-Générale de Santé' group in Paris, France (COS-RGDS-2017-06-014-P-THAUNAT-M).

Subjects
Adult, Male, musculoskeletal diseases, Anterolateral ligament, medicine.medical_specialty, Knee Joint, Anterior cruciate ligament, Pivot shift, Knee flexion, Knee kinematics, Weight-Bearing, BIOMECANIQUE, [SPI]Engineering Sciences [physics], 03 medical and health sciences, 0302 clinical medicine, medicine, Humans, Computer Simulation, Orthopedics and Sports Medicine, Femur, GENOU, Range of Motion, Articular, Physical Examination, Orthodontics, 030222 orthopedics, ANTEROLATERAL LIGAMENT, Anterior Cruciate Ligament Reconstruction, Tibia, business.industry, Biomechanics, [SPI.MECA.BIOM]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Biomechanics [physics.med-ph], food and beverages, 030229 sport sciences, COMPUTER MODELING, musculoskeletal system, Biomechanical Phenomena, Surgery, medicine.anatomical_structure, Ligaments, Articular, Squatting position, KNEE, business, Epicondyle, ANTERIOR CRUCIATE LIGAMENT
Abstract

Introduction Variations in the length of lateral extra-articular reconstruction (LER) have been widely investigated during knee flexion but there is no information about length changes during pivot shift. This study sought to assess the changes in LER tension during weightbearing knee flexion in a normal knee and in a computer-simulated pivot-shift scenario. Hypothesis Placing the femoral tunnel posterior and proximal to the lateral femoral epicondyle allows the LER to tighten early in the flexion range during weightbearing (squatting motion) and simulated pivot-shift. Material and methods A computer model was used to simulate weightbearing knee flexion and pivot shift scenarios. Changes in LER tension were calculated in both scenarios by estimating the distance between six femoral attachment sites (posterior and proximal to the lateral femoral epicondyle) and two tibial tunnel locations: Gerdy's tubercle (GT) and the anterolateral ligament (ALL) anatomic attachment site. Results Independent of the location of the femoral and tibial tunnels, the LER tightened by up to 22% of its resting length during the early portion of weightbearing knee flexion and then relaxed from 40° to 60° of knee flexion. The ALL tibial tunnel position allowed complete LER relaxation at 60° flexion whereas LER using the GT tibial tunnel position remained tighter. In the simulated pivot-shift test, and for all femoral tunnel locations, the LER tightened by 20% to 34% of its resting value for the GT tibial tunnel position and by 11% to 26% for the ALL tibial tunnel position. Discussion During weightbearing knee flexion, placing the femoral tunnel proximal and posterior to the femoral epicondyle was associated with LER tightening in the early degrees of flexion and LER relaxation between 40 and 60° flexion. LER tightening occurred during a simulated pivot-shift test supporting the concept that a posterior and proximal femoral LER tunnel position is most effective during weightbearing knee flexion and altered knee kinematics.

Published
2019

2. Invitations and responses across different languages: Observations on the feasibility and relevance of a cross-linguistic comparative perspective on the study of actions

Author

Paul Drew, Piera Margutti, Liisa Tainio, Véronique Traverso, Institut Français du Proche-Orient (IFPO), MIN AFF ETRANG-Centre National de la Recherche Scientifique (CNRS), Interactions, Corpus, Apprentissages, Représentations (ICAR), École normale supérieure - Lyon (ENS Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS), Les auteurs remercient le LABEX ASLAN (ANR-10-LABX-0081) de l'Université de Lyon pour son soutien financier dans le cadre du programme 'Investissements d'Avenir' (ANR-11-IDEX-0007) de l'Etat Français géré par l'Agence Nationale de la Recherche (ANR)., Ministère de l'Europe et des Affaires étrangères (MEAE)-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure de Lyon (ENS de Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Invitations, Conversation Analysis, Cross-cultural analysis, telephone calls, Italian, Linguistics and Language, Casual, media_common.quotation_subject, Language and Linguistics, 030507 speech-language pathology & audiology, 03 medical and health sciences, Artificial Intelligence, Conversation, Relevance (information retrieval), [SHS.LANGUE]Humanities and Social Sciences/Linguistics, ComputingMilieux_MISCELLANEOUS, media_common, 060201 languages & linguistics, Turn-taking, 06 humanities and the arts, Pragmatics, Linguistics, Focus (linguistics), Conversation analysis, 0602 languages and literature, 0305 other medical science, Psychology, Cross linguistic
Abstract

This special issue of the Journal of Pragmatics concerns the activity of inviting and responding to invitations in authentic telephone calls in six different languages. Using Conversational Analysis to investigate telephone calls that were audio- recorded in family homes, and in one case, in a bank office, the papers focus on invitations to friends, famiily members, acquaintances and other casual recipients in ordinary and institutional conversations.

Published
2018

3. Global solutions for a hyperbolic–parabolic system of chemotaxis

Author

Rafael Granero-Belinchón, Équations aux dérivées partielles, analyse (EDPA), Institut Camille Jordan [Villeurbanne] (ICJ), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), This work was supported by the LABEX MILYON (ANR-10-LABX-0070) of Université de Lyon, within the program 'Investissements d'Avenir' (ANR-11-IDEX-0007) operated by the French National Research Agency (ANR)., ANR-10-LABX-0070,MILYON,Community of mathematics and fundamental computer science in Lyon(2010), and ANR-11-IDEX-0007,Avenir L.S.E.,PROJET AVENIR LYON SAINT-ETIENNE(2011)

Subjects
Tumor angiogenesis, Quantitative Biology::Tissues and Organs, Applied Mathematics, 010102 general mathematics, Chemotaxis, Dissipation, 01 natural sciences, Quantitative Biology::Cell Behavior, 010101 applied mathematics, Parabolic system, Mathematics - Analysis of PDEs, FOS: Mathematics, [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], Applied mathematics, 0101 mathematics, Fractional Laplacian, Analysis, Analysis of PDEs (math.AP), Mathematics
Abstract

We study a hyperbolic–parabolic model of chemotaxis related to tumor angiogenesis in dimensions one and two. We consider diffusions given by the fractional Laplacian and, in particular, we prove the global existence of classical solutions in certain dissipation regimes.

Published
2017

4. Analytical and variational numerical methods for unstable miscible displacement flows in porous media

Author

Guglielmo Scovazzi, Andro Mikelić, Sanghyun Lee, Mary F. Wheeler, Department of Civil and Environmental Engineering, Duke University, Duke University [Durham], Institute for Computational Engineering and Sciences [Austin] (ICES), University of Texas at Austin [Austin], Modélisation mathématique, calcul scientifique (MMCS), Institut Camille Jordan [Villeurbanne] (ICJ), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Le projet MOCOMIPOC (Modélisation multiéchelles des écoulements complexes en présence de gaz dans les milieux chargés) du programme NEEDS (Projet fédérateur Milieux Poreux MIPOR), CNRS.., Ce travail a été réalisé grâce au soutien financier du LABEX MILYON(ANR-10-LABX-0070) de l'Université de Lyon, dans le cadre du programme 'Investissements d'Avenir' (ANR-11-IDEX-0007) géré par l'Agence Nationale de la Recherche (ANR)., and ANR-10-LABX-0070,MILYON,Community of mathematics and fundamental computer science in Lyon(2010)

Subjects
Physics and Astronomy (miscellaneous), variational methods, 010103 numerical & computational mathematics, 01 natural sciences, Miscible displacement, Physics::Fluid Dynamics, Robustness (computer science), Convergence (routing), [MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP], Sensitivity (control systems), Tensor, 0101 mathematics, viscous fingering, Mathematics, Numerical Analysis, Advection, Applied Mathematics, Numerical analysis, Mechanics, Galerkin methods, Computer Science Applications, 010101 applied mathematics, Computational Mathematics, Classical mechanics, flow instabilities, numerical simulation, Modeling and Simulation, Hele-Shaw, Porous medium, Displacement (fluid)
Abstract

International audience; The miscible displacement of one fluid by another in a porous medium has received considerable attention in sub-surface, environmental and petroleum engineering applications. When a fluid of higher mobility displaces another of lower mobility, unstable patterns-referred to as viscous fingering-may arise. Their physical and mathematical study has been the object of numerous investigations over the past century. The objective of this paper is to present a review of these contributions with particular emphasis on variational methods. These algorithms are tailored to real field applications thanks to their advanced features: handling of general complex geometries, robustness in the presence of rough tensor coefficients, low sensitivity to mesh orientation in advection dominated scenarios, and provable convergence with fully unstructured grids. This paper is dedicated to the memory of Dr. Jim Douglas Jr., for his seminal contributions to miscible displacement and variational numerical methods.

Published
2017

5. First-principles calculations of heat capacities of ultrafast laser-excited electrons in metals

Author

Jean-Philippe Colombier, V. Recoules, Razvan Stoian, Emile Bévillon, Laboratoire Hubert Curien [Saint Etienne] (LHC), Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ANR project DYLIPSS(ANR-12-IS04-0002-01), LABEX MANUTECH-SISE (ANR-10-LABX-0075) of the Université de Lyon, within the program 'Investissements d’Avenir' (ANR-11-IDEX-0007) operated by theFrench National Research Agency (ANR)., ANR-12-IS04-0002,DYLIPSS,Dynamique des Structures Périodiques de Surface Induites par Laser(2012), Laboratoire Hubert Curien (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), and Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Free electron model, Condensed Matter - Materials Science, Thermal effective mass, Chemistry, First-Principles calculations, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, General Physics and Astronomy, Surfaces and Interfaces, General Chemistry, Electron, Ultrashort laser, Condensed Matter Physics, Heat capacity, Electronic Heat Capacities, Surfaces, Coatings and Films, Core electron, Excited state, Atom, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Femtosecond laser-excited electrons, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Atomic physics, Electronic band structure
Abstract

International audience; Ultrafast laser excitation can induce fast increases of the electronic subsystem temperature. The subsequent electronic evolutions in terms of band structure and energy distribution can determine the change of several thermodynamic properties, including one essential for energy deposition; the electronic heat capacity. Using density functional calculations performed at finite electronic temperatures, the electronic heat capacities dependent on electronic temperatures are obtained for a series of metals, including free electron like, transition and noble metals. The effect of exchange and correlation functionals and the presence of semicore electrons on electronic heat capacities are first evaluated and found to be negligible in most cases. Then, we tested the validity of the free electron approaches, varying the number of free electrons per atom. This shows that only simple metals can be correctly fitted with these approaches. For transition metals, the presence of localized d electrons produces a strong deviation toward high energies of the electronic heat capacities, implying that more energy is needed to thermally excite them, compared to free sp electrons. This is attributed to collective excitation effects strengthened by a change of the electronic screening at high temperature.

Published
2015

6. Individualization of Educational Process According to C. Freinet: A Pilot Experiment in a Group of Language Learners

Author

Jean-Claude Regnier, Ekaterina M. Kuznetsova, National Research Tomsk State University, ADIS-Langues, Interactions, Corpus, Apprentissages, Représentations (ICAR), École normale supérieure - Lyon (ENS Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS), Les auteurs remercient le LABEX ASLAN (ANR-10-LABX-0081) de l'Université de Lyon pour son soutien financier dans le cadre du programme 'Investissements d'Avenir' (ANR-11-IDEX-0007) de l'Etat Français géré par l'Agence Nationale de la Recherche (ANR)., and École normale supérieure de Lyon (ENS de Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Engineering, C. Freinet, Pilot experiment, Process (engineering), business.industry, [SHS.EDU]Humanities and Social Sciences/Education, Teaching method, Foreign language, educational process, unconventional teaching methods, Pedagogy, ComputingMilieux_COMPUTERSANDEDUCATION, Mathematics education, Individualization, General Materials Science, business
Abstract

International audience; The article presents the pedagogical conception of the French educator C. Freinet as a way to implement the principle of individualization in modern educational practices. We designed a pilot experiment based on application of Freinet's teaching methods. The experiment conducted in the conditions of a foreign language course resulted in increased student motivation towards learning.

Published
2014
Full Text
View/download PDF

7. The Content of Spiritual and Religious Component of the Communicative Competence

Author

Jean-Claude Regnier, Irina M. Degil, Interactions, Corpus, Apprentissages, Représentations (ICAR), École normale supérieure de Lyon (ENS de Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS), Tomsk State University [Tomsk], ADIS-Langues, École normale supérieure de Lyon (ENS de Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS), Les auteurs remercient le LABEX ASLAN (ANR-10-LABX-0081) de l'Université de Lyon pour son soutien financier dans le cadre du programme 'Investissements d'Avenir' (ANR-11-IDEX-0007) de l'Etat Français géré par l'Agence Nationale de la Recherche (ANR)., École normale supérieure - Lyon (ENS Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS), and École normale supérieure - Lyon (ENS Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Communicative competence, Religious values, business.industry, Interpretation (philosophy), [SHS.EDU]Humanities and Social Sciences/Education, Subject (philosophy), Secular ethics, Personal development, religious values, Spirituality, General Materials Science, Spiritual and religious component, Meaning (existential), communicative competence, Psychology, business, Social psychology, sociocultural competence
Abstract

International audience; In this paper we analyzed the role of religion in the models of the communicative competence. We examined the meaning of the concept “spirituality” and found out that its content depends on the point of view: religious or secular. In the secular interpretation, spirituality is related to the exalted emotional condition and considered to be an aspiration to absolute truth. From the religious point of view, spirituality is determined by the individual's personal relations with God. We summarized the ideas that lay behind the discussion of new subject on the Basics of religion and secular ethics in public schools. These ideas define the role of spiritual and religious component in educational process and its potential for personal development.

Published
2014
Full Text
View/download PDF

8. How do tutors deliver instruction in the desktop videoconferencing environment? Tutoring practice analysis: Trainee tutors and experienced teachers

Author

Christine Develotte, Tatiana Codreanu, Interactions, Corpus, Apprentissages, Représentations (ICAR), École normale supérieure de Lyon (ENS de Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS), Les auteurs remercient le LABEX ASLAN (ANR-10-LABX-0081) de l'Université de Lyon pour son soutien financier dans le cadre du programme 'Investissements d'Avenir' (ANR-11-IDEX-0007) de l'Etat Français géré par l'Agence Nationale de la Recherche (ANR)., and École normale supérieure - Lyon (ENS Lyon)-Université Lumière - Lyon 2 (UL2)-INRP-Ecole Normale Supérieure Lettres et Sciences Humaines (ENS LSH)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Medical education, education, Computer science, analysis, online tutoring, Foreign language, Computer-mediated discourse analysis, Online tutoring, The arts, Task (project management), Multimodality, desktop videoconferencing, interaction analysis, Pedagogy, tutors, videoconference, ComputingMilieux_COMPUTERSANDEDUCATION, General Materials Science, Desktop videoconferencing, instructions, [SHS.LANGUE]Humanities and Social Sciences/Linguistics, Competence (human resources), multimodality, Meaning (linguistics)
Abstract

International audience; This paper describes tutoring practices of two different populations of online teachers: trainee tutors (second year students in the Master of Arts in Teaching French as a Foreign Language at the Université Lumière – Lyon 2) and experienced teachers based in different locations (France, Spain and Finland). They participated in a project using a desktop videoconferencing platform designed for delivering online language courses. They taught French as a Foreign Language to a group of students from UC Berkeley in 2010. The paper introduces the related research questions of instructional online practices in a synchronous environment: how the two populations of teachers introduce the learning tasks, and by which means the information is provided to the students. We will emphasize the role of different communication tools (written chat facility, oral chat facility and webcam) used by the two populations of tutors in order to convey the meaning of the task to be carried out. We discuss the qualitative findings of the study conducted on this multimodal corpus in order to highlight the semio-pedagogical competences of the two populations of online tutors.

Published
2012
Full Text
View/download PDF

9. Broadband solid-state MAS NMR of paramagnetic systems

Author

Andrew J. Pell, Guido Pintacuda, Apollo - University of Cambridge Repository, Biological Solid-State NMR Methods - Méthodes de RMN à l'état solide en biologie, Institut des Sciences Analytiques (ISA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), A.J.P. was supported by the LABEX iMUST (ANR-10-LABX-0064) of the Universite de Lyon, within the program Investissements d'Avenir (ANR-11-IDEX-0007) operated by the Agence Nationale de la Recherche (ANR). The research leading to these results has received funding from the People Programme (Marie Curie Actions Initial Training Networks (ITN)) of the European Union's Seventh Framework Programme FP7/2007-2013/ under REA grant agreement No. 317127, the 'pNMR' project., ANR-11-IDEX-0007,Avenir L.S.E.,PROJET AVENIR LYON SAINT-ETIENNE(2011), European Project: 317127,EC:FP7:PEOPLE,FP7-PEOPLE-2012-ITN,PNMR(2013), Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Magnetic Resonance Spectroscopy, Complex system, P-31 NMR, Broadband, Biochemistry, Solid-state NMR, Analytical Chemistry, SENSITIVITY ENHANCEMENT, Paramagnetism, Nuclear magnetic resonance, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Magic angle spinning, HYPERBOLIC SECANT PULSES, NUCLEAR-MAGNETIC-RESONANCE, Spectroscopy, Adiabatic pulse, ADIABATIC PULSES, Chemistry, HYPERFINE SHIFTS, SPIN QUADRUPOLAR NUCLEI, Models, Theoretical, CATHODE MATERIALS, Computational physics, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Paramagnetic, Solid-state nuclear magnetic resonance, Magnet, Excited state, ROTATING SOLIDS, Condensed Matter::Strongly Correlated Electrons, Excitation, SELECTIVE EXCITATION, Magic-angle spinning
Abstract

We acknowledge Prof. Lyndon Emsley and Mr. Kevin J. Sanders (Ecole Normale Superieure de Lyon), Prof. Clare P. Grey and Ms. Raphaele J. Clement (University of Cambridge), Dr. Dominique Massiot and Dr. Michael Deschamps (Universite d'Orleans), and Prof. Philip J. Grandinetti (Ohio State University) for many useful discussions about various aspects of broadband NMR sequences, adiabaticity, and the jolting frame. We are grateful to Prof. M. Stanley Whittingham and Dr. Joel K. Miller (State University of New York at Binghamton) for supplying the sample of LiFe0.5Mn0.5PO4.; International audience; The combination of new magnet and probe technology with increasingly sophisticated pulse sequences has resulted in an increase in the number of applications of solid-state nuclear magnetic resonance (NMR) spectroscopy to paramagnetic materials and biomolecules. The interaction between the paramagnetic metal ions and the NMR-active nuclei often yields crucial structural or electronic information about the system. In particular the application of magic-angle spinning (MAS) has been shown to be crucial to obtaining resolution that is sufficiently high for studying complex systems. However such systems are generally extremely difficult to study as the shifts and shift anisotropies resulting from the same paramagnetic interaction broaden the spectrum beyond excitation and detection, and the paramagnetic relaxation enhancement (PRE) shortens the lifetimes of the excited signals considerably. One specific area that has therefore been receiving significant attention in recent years, and for which great improvements have been seen, is the development of broadband NMR sequences. The development of new excitation and inversion sequences for paramagnetic systems under MAS has often made the difference between the spectrum being unobtainable, and a complete NMR study being possible. However the development of the new sequences must explicitly take account of the modulation of the anisotropic shift interactions due to the sample rotation, with the resulting spin dynamics often being complicated considerably. The NMR sequences can either be helped or hindered by MAS, with the efficiency of some pulse schemes being destroyed, and others being greatly enhanced. This review describes the pulse sequences that have recently been proposed for broadband excitation, inversion, and refocussing of the signal components of paramagnetic systems. In doing so we define exactly what is meant by "broadband" under spinning conditions, and what the perfect pulse scheme should deliver. We also give a unified description of the spin dynamics under MAS which highlights the strengths and weaknesses of the various schemes, and which can be used as guidance for future research in this area. All the reviewed pulse schemes are evaluated both with simulations and experimental data obtained on the battery material LiFe0.5Mn0.5PO4 which is typical of the complexity of the paramagnetic systems that are currently under study.

Published
2015

Catalog

Books, media, physical & digital resources
See catalog results