Search results for "PERT"
showing 10 items of 7689 documents
Micromechanical Properties and Collagen Composition of Ruptured Human Achilles Tendon
2012
Background:The Achilles tendon is one of the strongest tendons in the human body, and yet it frequently ruptures, which is a substantial clinical problem. However, the cause of ruptures remains elusive.Hypothesis:Ruptured human Achilles tendon displays inferior biomechanical properties and altered collagen composition compared with noninjured tendon.Study Design:Controlled laboratory study.Methods:Biopsy specimens were obtained at the rupture site and the noninjured part of the tendon (internal controls) in 17 patients with acute Achilles tendon rupture. Age- and weight-matched human cadaveric Achilles tendons (external controls) were also obtained. Tendon samples were tested micromechanica…
Mechanical loading influences the lumbar intervertebral disc. A cross-sectional study in 308 athletes and 71 controls.
2020
There is evidence in animal populations that loading and exercise can positively impact the intervertebral disc (IVD). However, there is a paucity of information in humans. We examined the lumbar IVDs in 308 young athletes across six sporting groups (baseball, swimming, basketball, kendo, soccer, and running; mean age 19 years) and 71 nonathletic controls. IVD status was quantified via the ratio of IVD to vertebral body height (IVD hypertrophy) and ratio of signal intensity in the nucleus to that in the annulus signal (IVD nucleus hydration) on sagittal T2-weighted magnetic resonance imaging. P values were adjusted via the false discovery rate method to mitigate false positives. In examinin…
Numerical experimental analysis of hybrid double lap aluminum-CFRP joints
2015
Abstract Due to their reliability and ease of assembly, both the adhesively bonded and the mechanical joints are commonly used in different fields of modern industrial design and manufacturing, to joint composite materials or composites with metals. As it is well known, adhesively bonded joints are characterized by high stiffness and good fatigue life, although delamination phenomena localized near the free edges may limit their use, especially for applications where corrosive environments and/or moisture can lead to premature failure of the bonding. In these cases, a possible alternative is given by the well-known mechanical joints. On the contrary, these last joints (bolted, riveted) requ…
Effect of Training-Induced Changes in Achilles Tendon Stiffness on Muscle–Tendon Behavior During Landing
2018
During rapid deceleration of the body, tendons buffer part of the elongation of the muscle–tendon unit (MTU), enabling safe energy dissipation via eccentric muscle contraction. Yet, the influence of changes in tendon stiffness within the physiological range upon these lengthening contractions is unknown. This study aimed to examine the effect of training-induced stiffening of the Achilles tendon on triceps surae muscle–tendon behavior during a landing task. Twenty-one male subjects were assigned to either a 10-week resistance-training program consisting of single-leg isometric plantarflexion (n = 11) or to a non-training control group (n = 10). Before and after the training period, plantarf…
Training-induced increase in Achilles tendon stiffness affects tendon strain pattern during running
2019
Background During the stance phase of running, the elasticity of the Achilles tendon enables the utilisation of elastic energy and allows beneficial contractile conditions for the triceps surae muscles. However, the effect of changes in tendon mechanical properties induced by chronic loading is still poorly understood. We tested the hypothesis that a training-induced increase in Achilles tendon stiffness would result in reduced tendon strain during the stance phase of running, which would reduce fascicle strains in the triceps surae muscles, particularly in the mono-articular soleus. Methods Eleven subjects were assigned to a training group performing isometric single-leg plantarflexion co…
Presentazione” e “Conservazione” dei contesti antichi: alcuni casi di intervento sulle rovine
2008
L’esperienza interventista dei nostri giorni manifesta un marcato orientamento verso la valorizzazione ad ogni costo del patrimonio archeologico, a volte perpetuata quasi in assenza di una selezione delle reali possibilità di esecuzione o di una più sensata sostenibilità e durabilità dell’intervento. Non si può continuare a pensare di dovere offrire al pubblico tutto ed immediatamente, poiché, se mancano le risorse necessarie o un reale interesse da parte delle comunità, si corre il rischio di lasciare le rovine “riaffiorate” allo scoperto, alla mercé di una fruizione distratta o esposte a probabili azioni di saccheggio, oltre che di incessante degrado, ma anche di generare, nel tempo, una …
Kokemusta korkea-asteelta : musiikinopettajien kulttuurienvälinen asiantuntijuus
2009
Tarkastelen tässä luvussa musiikinopettajien kulttuurienvälistä asiantuntijuutta ja kansainvälistymistä korkea-asteen koulutuksessa. Ensin tarkastelen inhimillistä pääomaa, jonka luonteva osa kulttuurienvälinen osaaminen on. Sen jälkeen esittelen tapaustutkimukseni. peerReviewed
Muzikālās uztveres attīstība mūzikas klausīšanās procesā sākumskolas 2. klasē
2021
Bakalaura darba „Muzikālās uztveres attīstība mūzikas klausīšanās procesā sākumskolas 2. klasē” autore ir Jūlija Sokolova. Kā galveno problēmu pētījuma autore izceļ nepietiekamu mūzikas klausīšanos skolā, kas sekmētu mūzikas uztveres attīstību skolēniem un attīstītu viņos intelektuālās spējas. Darba mērķis ir gūt teorētiskās atziņas par sākumskolas skolēnu psiholoģisko raksturojumu, muzikālas uztveres jēdzienu un būtību, kā arī apzināt mūzikas klausīšanās procesa nozīmi sākumskolā. Darbā tika izmantota literatūra no vairākiem autoriem, uz kuru atziņām pamatojas pētījums. Galvenie no tiem ir: J. Birzkops, R. G. Šeudžens, J. Bumagina, J. Nazaikinskis, A. Līduma, I. Millere, D. Zariņš, I. Vild…
Tetragonal tungsten bronzes Nb8−xW9+xO47−δ: optimization strategies and transport properties of a new n-type thermoelectric oxide
2015
Engineering of nanoscaled structures may help controlling the electrical and thermal transport in solids, in particular for thermoelectric applications that require the combination of low thermal conductivity and low electrical resistivity. The tetragonal tungsten bronzes Nb8−xW9+xO47 (TTB) allow a continuous variation of the charge carrier concentration while fulfilling at the same time the concept of a “phonon-glass electron-crystal” through a layered nanostructure defined by intrinsic crystallographic shear planes. The thermoelectric properties of the tetragonal tungsten bronzes Nb8−xW9+xO47−δ (0 < x < 2) were studied in the temperature range from 373 to 973 K. Structural defects and the…
“I want to speak like the other people” : Second language learning as a virtuous spiral for migrant women?
2017
This article contributes to scholarship on migrant women’s second language (L2) education in North America and Europe. Questioning reductionist understandings of the relationship between female migrants, their receiving communities and L2 education, the authors consider existing literature as well as their own qualitative work to investigate the challenges, opportunities and agency of migrant women. Weaving together and thematically presenting previous scholarship and qualitative data from interviews, participant observations and classroom recordings from a mixed-gender L2 adult migrant classroom in Austria and an all-women L2 migrant classroom in the United States, they trouble conceptuali…