The Experts below are selected from a list of 153 Experts worldwide ranked by ideXlab platform
Mireille Turmine - One of the best experts on this subject based on the ideXlab platform.
-
Control of the growth of electrodeposited zinc oxide on FTO glass
CrystEngComm, 2018Co-Authors: Hajar Ghannam, Cyrille Bazin, Adil Chahboun, Mireille TurmineAbstract:In this work, zinc oxide (ZnO) was directly electrodeposited onto Fluorine-doped tin oxide (FTO). The physical and chemical heterogeneity of FTO have contributed to important and exploitable results. In fact, the doping of tin dioxide (SnO2) with fluorine distorts its rutile crystal lattice. This distortion leads to Contraction Mechanical constraints on the network contributing to a rough surface morphology. Moreover, the nano-roughness of FTO surface impedes the epitaxial growth of ZnO nanorods. However, this roughness combined with the chemical heterogeneity of the FTO surface leads to favored growth sites. This can be explained by the presence of fluorine atoms, into the SnO2 network, with a stronger electronegativity which attracts the ZnO nuclei. The accumulation of many nuclei around the same electronegative spot contributes to the development of nanoflower-like structures or tilted nanorods. In such case, the non-polar facets of ZnO are exposed and the electrodeposited film is highly hydrophobic. The growth of ZnO onto FTO was studied by varying four main parameters of the synthesis: time of electrodeposition, temperature, concentration of Zn 2+ precursor and concentration of KCl. The influence of those parameters on the shape, size, growth mechanism, and density of the ZnO electrodeposit was discussed. Thus, when the concentration of Zn 2+ precursor increases from 0.1 to 5 mM, the nanorods' size decreases but the density of these nanostructure increases leading to their organization in nanoflowers. However, the increase of KCl concentration from 0.5 to 4 M causes a change of the ZnO nanostructures shape from hexagonal nanorod arrays to nanopencil arrays and also a significant decrease of density accompanied with a significant increase of ZnO nanostructures size whose diameter varies from 90 to 200 nm. Furthermore, the time of electrodeposition is a key parameter influencing the height of ZnO nanorods. Finally, a good crystallization of ZnO is observed at high temperature (about 80°C).
-
Control of the growth of electrodeposited zinc oxide on FTO glass
CrystEngComm, 2018Co-Authors: Hajar Ghannam, Cyrille Bazin, Adil Chahboun, Mireille TurmineAbstract:In this work, zinc oxide (ZnO) was directly electrodeposited onto fluorine-doped tin oxide (FTO). The physical and chemical heterogeneity of FTO have contributed to important and exploitable results. In fact, the doping of tin dioxide (SnO2) with fluorine distorts its rutile crystal lattice. This distortion leads to Contraction Mechanical constraints on the network contributing to a rough surface morphology. Moreover, the nano-roughness of the FTO surface impedes the epitaxial growth of ZnO nanorods. However, this roughness combined with the chemical heterogeneity of the FTO surface leads to favored growth sites. This can be explained by the presence of fluorine atoms in the SnO2 network with a stronger electronegativity which attracts the ZnO nuclei. The accumulation of many nuclei around the same electronegative spot contributes to the development of nanoflower-like structures or tilted nanorods. In such a case, the non-polar facets of ZnO are exposed and the electrodeposited film is highly hydrophobic. The growth of ZnO onto FTO was studied by varying four main parameters of the synthesis: time of electrodeposition, temperature, concentration of the Zn2+ precursor and concentration of KCl. The influence of those parameters on the shape, size, growth mechanism, and density of the ZnO electrodeposit was discussed. Thus, when the concentration of the Zn2+ precursor increases from 0.1 to 5 mM, the nanorods' size decreases but the density of these nanostructures increases leading to their organization in nanoflowers. However, the increase of the KCl concentration from 0.5 to 4 M causes a change of the ZnO nanostructure shape from hexagonal nanorod arrays to nanopencil arrays and also a significant decrease of density accompanied with a significant increase of the ZnO nanostructure size whose diameter varies from 90 to 200 nm. Furthermore, the time of electrodeposition is a key parameter influencing the height of ZnO nanorods. Finally, good crystallization of ZnO is observed at a high temperature (about 80 °C).
Giuseppe Rabita - One of the best experts on this subject based on the ideXlab platform.
-
Mechanical and Muscular Coordination Patterns during a High-Level Fencing Assault
Medicine and Science in Sports and Exercise, 2014Co-Authors: Gaël Guilhem, Caroline Giroux, Antoine Couturier, Didier Chollet, Giuseppe RabitaAbstract:Purpose: This study aimed to investigate the coordination of lower limb muscles during a specific fencing gesture in relation to its Mechanical effectiveness. Methods: Maximal isokinetic concentric and isometric plantarflexor, dorsiflexor, knee and hip extensor and flexor torques of 10 female elite saber fencers were assessed and compared between both legs. Sabers completed three trials of a specific fencing gesture (i.e., marché-fente) on a 6.60-m-long force platform system. Surface EMG activities of 15 lower limb muscles were recorded in time with ground reaction forces and separated into four distinct assault phases. EMG signals were normalized to the muscle activity assessed during maximal isometric Contraction. Mechanical and EMG data were compared between both legs over the entire assault and in each phase (ANOVA). Potential correlations between muscle strength and average EMG activities were tested (Bravais–Pearson coefficient). Results: EMG activity patterns showed that rear hip and knee extensor and plantarflexor muscles were mainly activated during propulsive (concentric) phases, while front hip and knee extensor muscles were strongly solicited during the final braking (eccentric) phase to decelerate the body mass. Although fencers presented greater maximal hip (+10%) and knee (+26%) extensor strength in the front than in the rear leg (P G 0.05), rear hip and knee extensor strength was significantly correlated to the maximal anteroposterior velocity (r = 0.60–0.81). Moreover, muscle activity of the rear extensors was related to average velocity during the second propulsive phase (phase 3). Conclusions: This study gathers the first evidence of a crucial role of the rear extensor muscles in fencing speed performance. Such findings suggest interesting perspectives in the definition of specific training or rehabilitation programs for elite fencers.
-
Mechanical and Muscular Coordination Patterns during a High-Level Fencing Assault
Medicine and science in sports and exercise, 2014Co-Authors: Gaël Guilhem, Caroline Giroux, Antoine Couturier, Didier Chollet, Giuseppe RabitaAbstract:Purpose: This study aimed to investigate the coordination of lower limb muscles during a specific fencing gesture in relation to its Mechanical effectiveness. Methods: Maximal isokinetic concentric and isometric plantarflexor, dorsiflexor, knee and hip extensor and flexor torques of 10 female elite saber fencers were assessed and compared between both legs. Sabers completed three trials of a specific fencing gesture (i.e., marche-fente) on a 6.60-m-long force platform system. Surface EMG activities of 15 lower limb muscles were recorded in time with ground reaction forces and separated into four distinct assault phases. EMG signals were normalized to the muscle activity assessed during maximal isometric Contraction. Mechanical and EMG data were compared between both legs over the entire assault and in each phase (ANOVA). Potential correlations between muscle strength and average EMG activities were tested (Bravais–Pearson coefficient). Results: EMG activity patterns showed that rear hip and knee extensor and plantarflexor muscles were mainly activated during propulsive (concentric) phases, while front hip and knee extensor muscles were strongly solicited during the final braking (eccentric) phase to decelerate the body mass. Although fencers presented greater maximal hip (+10%) and knee (+26%) extensor strength in the front than in the rear leg (P G 0.05), rear hip and knee extensor strength was significantly correlated to the maximal anteroposterior velocity (r = 0.60–0.81). Moreover, muscle activity of the rear extensors was related to average velocity during the second propulsive phase (phase 3). Conclusions: This study gathers the first evidence of a crucial role of the rear extensor muscles in fencing speed performance. Such findings suggest interesting perspectives in the definition of specific training or rehabilitation programs for elite fencers.
Hajar Ghannam - One of the best experts on this subject based on the ideXlab platform.
-
Control of the growth of electrodeposited zinc oxide on FTO glass
CrystEngComm, 2018Co-Authors: Hajar Ghannam, Cyrille Bazin, Adil Chahboun, Mireille TurmineAbstract:In this work, zinc oxide (ZnO) was directly electrodeposited onto Fluorine-doped tin oxide (FTO). The physical and chemical heterogeneity of FTO have contributed to important and exploitable results. In fact, the doping of tin dioxide (SnO2) with fluorine distorts its rutile crystal lattice. This distortion leads to Contraction Mechanical constraints on the network contributing to a rough surface morphology. Moreover, the nano-roughness of FTO surface impedes the epitaxial growth of ZnO nanorods. However, this roughness combined with the chemical heterogeneity of the FTO surface leads to favored growth sites. This can be explained by the presence of fluorine atoms, into the SnO2 network, with a stronger electronegativity which attracts the ZnO nuclei. The accumulation of many nuclei around the same electronegative spot contributes to the development of nanoflower-like structures or tilted nanorods. In such case, the non-polar facets of ZnO are exposed and the electrodeposited film is highly hydrophobic. The growth of ZnO onto FTO was studied by varying four main parameters of the synthesis: time of electrodeposition, temperature, concentration of Zn 2+ precursor and concentration of KCl. The influence of those parameters on the shape, size, growth mechanism, and density of the ZnO electrodeposit was discussed. Thus, when the concentration of Zn 2+ precursor increases from 0.1 to 5 mM, the nanorods' size decreases but the density of these nanostructure increases leading to their organization in nanoflowers. However, the increase of KCl concentration from 0.5 to 4 M causes a change of the ZnO nanostructures shape from hexagonal nanorod arrays to nanopencil arrays and also a significant decrease of density accompanied with a significant increase of ZnO nanostructures size whose diameter varies from 90 to 200 nm. Furthermore, the time of electrodeposition is a key parameter influencing the height of ZnO nanorods. Finally, a good crystallization of ZnO is observed at high temperature (about 80°C).
-
Control of the growth of electrodeposited zinc oxide on FTO glass
CrystEngComm, 2018Co-Authors: Hajar Ghannam, Cyrille Bazin, Adil Chahboun, Mireille TurmineAbstract:In this work, zinc oxide (ZnO) was directly electrodeposited onto fluorine-doped tin oxide (FTO). The physical and chemical heterogeneity of FTO have contributed to important and exploitable results. In fact, the doping of tin dioxide (SnO2) with fluorine distorts its rutile crystal lattice. This distortion leads to Contraction Mechanical constraints on the network contributing to a rough surface morphology. Moreover, the nano-roughness of the FTO surface impedes the epitaxial growth of ZnO nanorods. However, this roughness combined with the chemical heterogeneity of the FTO surface leads to favored growth sites. This can be explained by the presence of fluorine atoms in the SnO2 network with a stronger electronegativity which attracts the ZnO nuclei. The accumulation of many nuclei around the same electronegative spot contributes to the development of nanoflower-like structures or tilted nanorods. In such a case, the non-polar facets of ZnO are exposed and the electrodeposited film is highly hydrophobic. The growth of ZnO onto FTO was studied by varying four main parameters of the synthesis: time of electrodeposition, temperature, concentration of the Zn2+ precursor and concentration of KCl. The influence of those parameters on the shape, size, growth mechanism, and density of the ZnO electrodeposit was discussed. Thus, when the concentration of the Zn2+ precursor increases from 0.1 to 5 mM, the nanorods' size decreases but the density of these nanostructures increases leading to their organization in nanoflowers. However, the increase of the KCl concentration from 0.5 to 4 M causes a change of the ZnO nanostructure shape from hexagonal nanorod arrays to nanopencil arrays and also a significant decrease of density accompanied with a significant increase of the ZnO nanostructure size whose diameter varies from 90 to 200 nm. Furthermore, the time of electrodeposition is a key parameter influencing the height of ZnO nanorods. Finally, good crystallization of ZnO is observed at a high temperature (about 80 °C).
Gaël Guilhem - One of the best experts on this subject based on the ideXlab platform.
-
Mechanical and Muscular Coordination Patterns during a High-Level Fencing Assault
Medicine and Science in Sports and Exercise, 2014Co-Authors: Gaël Guilhem, Caroline Giroux, Antoine Couturier, Didier Chollet, Giuseppe RabitaAbstract:Purpose: This study aimed to investigate the coordination of lower limb muscles during a specific fencing gesture in relation to its Mechanical effectiveness. Methods: Maximal isokinetic concentric and isometric plantarflexor, dorsiflexor, knee and hip extensor and flexor torques of 10 female elite saber fencers were assessed and compared between both legs. Sabers completed three trials of a specific fencing gesture (i.e., marché-fente) on a 6.60-m-long force platform system. Surface EMG activities of 15 lower limb muscles were recorded in time with ground reaction forces and separated into four distinct assault phases. EMG signals were normalized to the muscle activity assessed during maximal isometric Contraction. Mechanical and EMG data were compared between both legs over the entire assault and in each phase (ANOVA). Potential correlations between muscle strength and average EMG activities were tested (Bravais–Pearson coefficient). Results: EMG activity patterns showed that rear hip and knee extensor and plantarflexor muscles were mainly activated during propulsive (concentric) phases, while front hip and knee extensor muscles were strongly solicited during the final braking (eccentric) phase to decelerate the body mass. Although fencers presented greater maximal hip (+10%) and knee (+26%) extensor strength in the front than in the rear leg (P G 0.05), rear hip and knee extensor strength was significantly correlated to the maximal anteroposterior velocity (r = 0.60–0.81). Moreover, muscle activity of the rear extensors was related to average velocity during the second propulsive phase (phase 3). Conclusions: This study gathers the first evidence of a crucial role of the rear extensor muscles in fencing speed performance. Such findings suggest interesting perspectives in the definition of specific training or rehabilitation programs for elite fencers.
-
Mechanical and Muscular Coordination Patterns during a High-Level Fencing Assault
Medicine and science in sports and exercise, 2014Co-Authors: Gaël Guilhem, Caroline Giroux, Antoine Couturier, Didier Chollet, Giuseppe RabitaAbstract:Purpose: This study aimed to investigate the coordination of lower limb muscles during a specific fencing gesture in relation to its Mechanical effectiveness. Methods: Maximal isokinetic concentric and isometric plantarflexor, dorsiflexor, knee and hip extensor and flexor torques of 10 female elite saber fencers were assessed and compared between both legs. Sabers completed three trials of a specific fencing gesture (i.e., marche-fente) on a 6.60-m-long force platform system. Surface EMG activities of 15 lower limb muscles were recorded in time with ground reaction forces and separated into four distinct assault phases. EMG signals were normalized to the muscle activity assessed during maximal isometric Contraction. Mechanical and EMG data were compared between both legs over the entire assault and in each phase (ANOVA). Potential correlations between muscle strength and average EMG activities were tested (Bravais–Pearson coefficient). Results: EMG activity patterns showed that rear hip and knee extensor and plantarflexor muscles were mainly activated during propulsive (concentric) phases, while front hip and knee extensor muscles were strongly solicited during the final braking (eccentric) phase to decelerate the body mass. Although fencers presented greater maximal hip (+10%) and knee (+26%) extensor strength in the front than in the rear leg (P G 0.05), rear hip and knee extensor strength was significantly correlated to the maximal anteroposterior velocity (r = 0.60–0.81). Moreover, muscle activity of the rear extensors was related to average velocity during the second propulsive phase (phase 3). Conclusions: This study gathers the first evidence of a crucial role of the rear extensor muscles in fencing speed performance. Such findings suggest interesting perspectives in the definition of specific training or rehabilitation programs for elite fencers.
Marcos Felipe Nicoletti - One of the best experts on this subject based on the ideXlab platform.
-
Avaliação das Principais Propriedades Físicas e Mecânicas da Madeira de Eucalyptus benthamii Maiden et Cambage / Evaluation of the Main Physical and Mechanical Properties of Eucalyptus benthamii Maiden et Cambage Wood
Floresta e Ambiente, 2014Co-Authors: Bruna Verediana Müller, Márcio Pereira Da Rocha, Alexsandro Bayestorff Da Cunha, Ricardo Jorge Klitzke, Marcos Felipe NicolettiAbstract:The present study aimed to assess the physical and Mechanical properties of Eucalyptus benthamii Maiden et Cambage wood. The following physical properties were determined: apparent density at 12 and 0% moisture content, basic density, and indices of Contraction. Mechanical properties were determined through tests of static bending, compression parallel to the grain, shear, and hardness in six-year-old wood. Based on the results obtained in the determination of physical properties, E. benthamii wood at the age studied can be classified as moderately heavy and dimensionally unstable. The species showed low resistance with respect to Mechanical properties, which can be related to the large amount of juvenile wood observed in the material studied.