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Michael S Richards - One of the best experts on this subject based on the ideXlab platform.
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ultrasound Strain mapping of achilles tendon Compressive Strain patterns during dorsiflexion
Journal of Biomechanics, 2016Co-Authors: Ruth L Chimenti, Samuel A Flemister, John Ketz, Mary Bucklin, Mark R Buckley, Michael S RichardsAbstract:Abstract Heel lifts are commonly prescribed to patients with Achilles tendinopathy, yet little is known about the effect on tendon Compressive Strain. The purposes of the current study were to (1) develop a valid and reliable ultrasound elastography technique and algorithm to measure Compressive Strain of human Achilles tendon in vivo , (2) examine the effects of ankle dorsiflexion (lowering via controlled removal of a heel lift and partial squat) on Compressive Strain of the Achilles tendon insertion and (3) examine the relative Compressive Strain between the deep and superficial regions of the Achilles tendon insertion. All tasks started in a position equivalent to standing with a 30 mm heel lift. An ultrasound transducer positioned over the Achilles tendon insertion was used to capture radiofrequency images. A non-rigid image registration-based algorithm was used to estimate Compressive Strain of the tendon, which was divided into 2 regions (superficial, deep). The bland-Altman test and intraclass correlation coefficient were used to test validity and reliability. One-way repeated measures ANOVA was used to compare Compressive Strain between regions and across tasks. Compressive Strain was accurately and reliably (ICC>0.75) quantified. There was greater Compressive Strain during the combined task of lowering and partial squat compared to the lowering ( P =.001) and partial squat ( P P =.001). While these findings need to be examined in a pathological population, heel lifts may reduce tendon Compressive Strain during daily activities.
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Ultrasound Strain mapping of Achilles tendon Compressive Strain patterns during dorsiflexion.
Journal of biomechanics, 2015Co-Authors: Ruth L Chimenti, John Ketz, Mary Bucklin, Mark R Buckley, A. Samuel Flemister, Michael S RichardsAbstract:Heel lifts are commonly prescribed to patients with Achilles tendinopathy, yet little is known about the effect on tendon Compressive Strain. The purposes of the current study were to (1) develop a valid and reliable ultrasound elastography technique and algorithm to measure Compressive Strain of human Achilles tendon in vivo, (2) examine the effects of ankle dorsiflexion (lowering via controlled removal of a heel lift and partial squat) on Compressive Strain of the Achilles tendon insertion and (3) examine the relative Compressive Strain between the deep and superficial regions of the Achilles tendon insertion. All tasks started in a position equivalent to standing with a 30mm heel lift. An ultrasound transducer positioned over the Achilles tendon insertion was used to capture radiofrequency images. A non-rigid image registration-based algorithm was used to estimate Compressive Strain of the tendon, which was divided into 2 regions (superficial, deep). The bland-Altman test and intraclass correlation coefficient were used to test validity and reliability. One-way repeated measures ANOVA was used to compare Compressive Strain between regions and across tasks. Compressive Strain was accurately and reliably (ICC>0.75) quantified. There was greater Compressive Strain during the combined task of lowering and partial squat compared to the lowering (P=.001) and partial squat (P
Carlo Ferdeghini - One of the best experts on this subject based on the ideXlab platform.
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tc 21 k in epitaxial fese0 5te0 5 thin films with biaxial Compressive Strain
Applied Physics Letters, 2010Co-Authors: E. Bellingeri, I. Pallecchi, R. Buzio, A. Gerbi, D. Marrè, M. R. Cimberle, Matteo Tropeano, Marina Putti, A. Palenzona, Carlo FerdeghiniAbstract:Epitaxial FeSe0.5Te0.5 thin films with different thickness were grown by pulsed laser ablation deposition on different substrates. High purity phase and fully epitaxial growth were obtained. By varying the film thickness, superconducting transition temperatures up to 21 K were observed, significantly larger than the bulk value 16.2 K. Structural analyses indicated that the c-axis is smaller than the bulk value but it is almost independent of the film thickness and the a-axis changes significantly with the film thickness and is linearly related to the Tc. The latter result indicates the important role of the Compressive Strain in enhancing Tc. Tc is also related to both the Fe–(Se,Te) bond length and angle, suggesting the possibility of further enhancement.
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Tc=21K in epitaxial FeSe0.5Te0.5 thin films with biaxial Compressive Strain
Applied Physics Letters, 2010Co-Authors: E. Bellingeri, I. Pallecchi, R. Buzio, A. Gerbi, D. Marrè, M. R. Cimberle, Matteo Tropeano, Marina Putti, A. Palenzona, Carlo FerdeghiniAbstract:High purity epitaxial FeSe0.5Te0.5 thin films with different thickness were grown by Pulsed Laser Ablation on different substrates. By varying the film thickness, Tc up to 21K were observed, significantly larger than the bulk value. Structural analyses indicated that the a axis changes significantly with the film thickness and is linearly related to the Tc. The latter result indicates the important role of the Compressive Strain in enhancing Tc. Tc is also related to both the Fe-(Se,Te) bond length and angle, suggesting the possibility of further enhancement.
Ruth L Chimenti - One of the best experts on this subject based on the ideXlab platform.
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ultrasound Strain mapping of achilles tendon Compressive Strain patterns during dorsiflexion
Journal of Biomechanics, 2016Co-Authors: Ruth L Chimenti, Samuel A Flemister, John Ketz, Mary Bucklin, Mark R Buckley, Michael S RichardsAbstract:Abstract Heel lifts are commonly prescribed to patients with Achilles tendinopathy, yet little is known about the effect on tendon Compressive Strain. The purposes of the current study were to (1) develop a valid and reliable ultrasound elastography technique and algorithm to measure Compressive Strain of human Achilles tendon in vivo , (2) examine the effects of ankle dorsiflexion (lowering via controlled removal of a heel lift and partial squat) on Compressive Strain of the Achilles tendon insertion and (3) examine the relative Compressive Strain between the deep and superficial regions of the Achilles tendon insertion. All tasks started in a position equivalent to standing with a 30 mm heel lift. An ultrasound transducer positioned over the Achilles tendon insertion was used to capture radiofrequency images. A non-rigid image registration-based algorithm was used to estimate Compressive Strain of the tendon, which was divided into 2 regions (superficial, deep). The bland-Altman test and intraclass correlation coefficient were used to test validity and reliability. One-way repeated measures ANOVA was used to compare Compressive Strain between regions and across tasks. Compressive Strain was accurately and reliably (ICC>0.75) quantified. There was greater Compressive Strain during the combined task of lowering and partial squat compared to the lowering ( P =.001) and partial squat ( P P =.001). While these findings need to be examined in a pathological population, heel lifts may reduce tendon Compressive Strain during daily activities.
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Ultrasound Strain mapping of Achilles tendon Compressive Strain patterns during dorsiflexion.
Journal of biomechanics, 2015Co-Authors: Ruth L Chimenti, John Ketz, Mary Bucklin, Mark R Buckley, A. Samuel Flemister, Michael S RichardsAbstract:Heel lifts are commonly prescribed to patients with Achilles tendinopathy, yet little is known about the effect on tendon Compressive Strain. The purposes of the current study were to (1) develop a valid and reliable ultrasound elastography technique and algorithm to measure Compressive Strain of human Achilles tendon in vivo, (2) examine the effects of ankle dorsiflexion (lowering via controlled removal of a heel lift and partial squat) on Compressive Strain of the Achilles tendon insertion and (3) examine the relative Compressive Strain between the deep and superficial regions of the Achilles tendon insertion. All tasks started in a position equivalent to standing with a 30mm heel lift. An ultrasound transducer positioned over the Achilles tendon insertion was used to capture radiofrequency images. A non-rigid image registration-based algorithm was used to estimate Compressive Strain of the tendon, which was divided into 2 regions (superficial, deep). The bland-Altman test and intraclass correlation coefficient were used to test validity and reliability. One-way repeated measures ANOVA was used to compare Compressive Strain between regions and across tasks. Compressive Strain was accurately and reliably (ICC>0.75) quantified. There was greater Compressive Strain during the combined task of lowering and partial squat compared to the lowering (P=.001) and partial squat (P
R Datta - One of the best experts on this subject based on the ideXlab platform.
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substrate induced tuning of Compressive Strain and phonon modes in large area mos2 and ws2 van der waals epitaxial thin films
Journal of Crystal Growth, 2017Co-Authors: Rajib Sahu, Dhanya Radhakrishnan, B Vishal, D S Negi, Anomitra Sil, Chandrabhas Narayana, R DattaAbstract:Large area MoS2 and WS2 van der Waals epitaxial thin films with control over number of layers including monolayer is grown by pulsed laser deposition utilizing slower growth kinetics. The films grown on c-plane sapphire show stiffening of A(1g) and E-2g(1) phonon modes with decreasing number of layers for both MoS2 and WS2. The observed stiffening translate into the Compressive Strain of 0.52% & 0.53% with accompanying increase in fundamental direct band gap to 1.74 and 1.68 eV for monolayer MoS2 and WS2, respectively. The Strain decays with the number of layers. HRTEM imaging directly reveals the nature of atomic registry of van der Waals layers with the substrate and the associated Compressive Strain. The results demonstrate a practical route to stabilize and engineer Strain for this class of material over large area device fabrication. (C) 2017 Elsevier B.V. All rights reserved.
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substrate induced tuning of Compressive Strain and phonon modes in large area mos2 and ws2 van der waals epitaxial thin films
arXiv: Materials Science, 2016Co-Authors: Rajib Sahu, Dhanya Radhakrishnan, B Vishal, D S Negi, Anomitra Sil, Chandrabhas Narayana, R DattaAbstract:Large area MoS2 and WS2 van der Waals epitaxial thin films with complete control over number of layers including monolayer is grown by pulsed laser deposition utilizing slower growth kinetics. The films grown on c-plane sapphire show stiffening of A1g and E12g phonon modes with decreasing number of layers for both MoS2 and WS2. The observed stiffening translate into the Compressive Strain of 0.52 % & 0.53 % with accompanying increase in fundamental direct band gap to 1.74 and 1.68 eV for monolayer MoS2 and WS2, respectively. The Strain decays with the number of layers. HRTEM imaging directly reveals the nature of atomic registry of van der Waals layers with the substrate and the associated Compressive Strain. The results demonstrate a practical route to stabilize and engineer Strain for this class of material over large area device fabrication.
Sigurd Wagner - One of the best experts on this subject based on the ideXlab platform.
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Stability of Amorphous Silicon Thin Film Transistors under Prolonged High Compressive Strain
MRS Proceedings, 2007Co-Authors: Jian-zhang Chen, Sigurd Wagner, I-chun Cheng, Warren B. Jackson, Craig Perlov, Carl TaussigAbstract:AbstractWe studied the effect of prolonged mechanical Strain on the electrical characteristics of thin-film transistors of hydrogenated amorphous silicon made at a process temperature of 150°C on 51-μm thick Kapton polyimide foil substrates. Effects are observed only at very high Compressive Strain of 1.8%. Tensile Strain up to fracture at 0.3% to 0.5% does not show any effect, nor does Compressive Strain substantially less than 1.8%. The TFTs were stressed for times up to 23 days by bending around a tube with axis perpendicular to the channel length, and were evaluated in the flattened state. The changes observed are small. The threshold voltage is increased, the “on” current and the field effect mobility remain essentially constant, and the subthreshold slope, “off” current and gate leakage current drop somewhat. Overall, the observed changes are small. We conclude that mechanical Strain caused by roll-to-roll processing and permanent shaping will have negligible effects on TFT performance.
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Electron mobility in amorphous silicon thin-film transistors under Compressive Strain
Applied Physics Letters, 2001Co-Authors: Helena Gleskova, Sigurd WagnerAbstract:We evaluated amorphous silicon thin-film transistors under uniaxial Compressive Strain of up to 1%. The on-current and hence the electron linear mobility decrease. The off-current, leakage current, and the threshold voltage do not change. The mobility decreases linearly with applied Compressive Strain. Upon the application of stress for up to 40 h the mobility drops “instantly” and then remains unchanged. We conclude that Compressive Strain broadens both the valence and conduction band tails of the a-Si:H channel material, and thus reduces the effective electron mobility.