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https://www.readbyqxmd.com/read/28720777/aging-and-rejuvenation-of-active-matter-under-topological-constraints
#1
Liesbeth M C Janssen, Andreas Kaiser, Hartmut Löwen
The coupling of active, self-motile particles to topological constraints can give rise to novel non-equilibrium dynamical patterns that lack any passive counterpart. Here we study the behavior of self-propelled rods confined to a compact spherical manifold by means of Brownian dynamics simulations. We establish the state diagram and find that short active rods at sufficiently high density exhibit a glass transition toward a disordered state characterized by persistent self-spinning motion. By periodically melting and revitrifying the spherical spinning glass, we observe clear signatures of time-dependent aging and rejuvenation physics...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28671813/self-powered-acceleration-sensor-based-on-liquid-metal-triboelectric-nanogenerator-for-vibration-monitoring
#2
Binbin Zhang, Lei Zhang, Weili Deng, Long Jin, Fengjun Chun, Hong Pan, Bingni Gu, Haitao Zhang, Zekai Lv, Weiqing Yang, Zhong Lin Wang
Acceleration sensor is an essential component of the vibration measurement, while the passivity and sensitivity are the pivotal features for its application. Here, we report a self-powered and high sensitive acceleration sensor based on triboelectric nanogenerator composed of liquid metal mercury droplet (LMMD) and nanofiber-networked polyvinylidene fluoride (nn-PVDF) film. Due to the ultrahigh surface-to-volume ratio of nn-PVDF film and high surface tension, high mass density, high elastic as well as mechanical robustness of LMMD, the open-circuit voltage and short-circuit current reach up to 15...
July 3, 2017: ACS Nano
https://www.readbyqxmd.com/read/28665655/real-time-observation-of-internal-motion-within-ultrafast-dissipative-optical-soliton-molecules
#3
Katarzyna Krupa, K Nithyanandan, Ugo Andral, Patrice Tchofo-Dinda, Philippe Grelu
Real-time access to the internal ultrafast dynamics of complex dissipative optical systems opens new explorations of pulse-pulse interactions and dynamic patterns. We present the first direct experimental evidence of the internal motion of a dissipative optical soliton molecule generated in a passively mode-locked erbium-doped fiber laser. We map the internal motion of a soliton pair molecule by using a dispersive Fourier-transform imaging technique, revealing different categories of internal pulsations, including vibrationlike and phase drifting dynamics...
June 16, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28651417/-influences-of-different-rehabilitative-methods-on-function-of-hands-and-psychological-anxiety-of-patients-with-deeply-burned-hands-retaining-denatured-dermis-and-grafting-large-autologous-skin
#4
H Peng, P F Liang, A Wang, L Q Yue
Objective: To investigate influences of different rehabilitative methods on function of hands and psychological anxiety of patients with deeply burned hands retaining denatured dermis and grafting large autologous skin. Methods: Forty-four patients with deeply burned hands, conforming to the study criteria were admitted to Department of Burns and Reconstructive Surgery of Xiangya Hospital of Central South University from January 2014 to June 2015. Patients were divided into propaganda education rehabilitation group (PER, n=23) and specially-assigned person rehabilitation group (SAPR, n=21) according to the random number table and patients' willingness...
May 20, 2017: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/28631623/morphological-self-stabilization-of-locomotion-gaits-illustration-on-a-few-examples-from-bio-inspired-locomotion
#5
Christine Chevallereau, Frédéric Boyer, Mathieu Porez, Johan Mauny, Yannick Aoustin
To a large extent, robotics locomotion can be viewed as cyclic motions, named gaits. Due to the high complexity of the locomotion dynamics, to find the control laws that ensure an expected gait and its stability with respect to external perturbations, is a challenging issue for feedback control. To address this issue, a promising way is to take inspiration from animals that intensively exploit the interactions of the passive degrees of freedom of their body with their physical surroundings, to outsource the high-level exteroceptive feedback control to low-level proprioceptive ones...
June 20, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28575032/envelope-statistics-of-self-motion-signals-experienced-by-human-subjects-during-everyday-activities-implications-for-vestibular-processing
#6
Jérome Carriot, Mohsen Jamali, Kathleen E Cullen, Maurice J Chacron
There is accumulating evidence that the brain's neural coding strategies are constrained by natural stimulus statistics. Here we investigated the statistics of the time varying envelope (i.e. a second-order stimulus attribute that is related to variance) of rotational and translational self-motion signals experienced by human subjects during everyday activities. We found that envelopes can reach large values across all six motion dimensions (~450 deg/s for rotations and ~4 G for translations). Unlike results obtained in other sensory modalities, the spectral power of envelope signals decreased slowly for low (< 2 Hz) and more sharply for high (>2 Hz) temporal frequencies and thus was not well-fit by a power law...
2017: PloS One
https://www.readbyqxmd.com/read/28562674/how-does-functionality-proceed-in-acl-reconstructed-subjects-proceeding-of-functional-performance-from-pre-to-six-months-post-acl-reconstruction
#7
Frieder Cornelius Krafft, Bernd Josef Stetter, Thorsten Stein, Andree Ellermann, Johannes Flechtenmacher, Christian Eberle, Stefan Sell, Wolfgang Potthast
This is the first study examining functionality of subjects with anterior cruciate ligament (ACL) tears and a subsequent reconstruction comprehensively by multiple test sessions from pre- to six months post-reconstruction. The purpose was to evaluate if a generally applied rehabilitation program restores functionality to levels of healthy controls. Subjects with unilateral tears of the ACL were compared to matched healthy controls throughout the rehabilitation. 20 recreational athletes were tested: T1 (preoperative), 6 weeks after tear; T2, 6 weeks, T3, 3 months, T4, 6 months post-reconstruction...
2017: PloS One
https://www.readbyqxmd.com/read/28453288/photothermal-transport-of-dna-in-entropy-landscape-plasmonic-waveguides
#8
Cameron L C Smith, Anil H Thilsted, Jonas N Pedersen, Tomas H Youngman, Julia C Dyrnum, Nicolai A Michaelsen, Rodolphe Marie, Anders Kristensen
The ability to handle single, free molecules in lab-on-a-chip systems is key to the development of advanced biotechnologies. Entropic confinement offers passive control of polymers in nanofluidic systems by locally asserting a molecule's number of available conformation states through structured landscapes. Separately, a range of plasmonic configurations have demonstrated active manipulation of nano-objects by harnessing concentrated electric fields. The integration of these two independent techniques promises a range of sophisticated and complementary functions to handle, for example, DNA, but numerous difficulties, in particular, conflicting requirements of channel size, have prevented progress...
April 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28439720/the-impact-of-oral-promethazine-on-human-whole-body-motion-perceptual-thresholds
#9
Ana Diaz-Artiles, Adrian J Priesol, Torin K Clark, David P Sherwood, Charles M Oman, Laurence R Young, Faisal Karmali
Despite the widespread treatment of motion sickness symptoms using drugs and the involvement of the vestibular system in motion sickness, little is known about the effects of anti-motion sickness drugs on vestibular perception. In particular, the impact of oral promethazine, widely used for treating motion sickness, on vestibular perceptual thresholds has not previously been quantified. We examined whether promethazine (25 mg) alters vestibular perceptual thresholds in a counterbalanced, double-blind, within-subject study...
April 24, 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/28434022/effects-of-vestibular-disorders-on-vestibular-reflex-and-imagery
#10
B S Cohen, J Provasi, P Leboucher, I Israël
The aim of this study was to establish the effect of vestibular lesion on vestibular imagery. Subjects were required to estimate verbally their passively travelled rotation angles in complete darkness, i.e., to activate vestibular imagery. During motion, the vestibulo-ocular reflex (VOR) was measured. Thus, we examined the coherence between the vestibulo-ocular reflex and self-rotation imagery, with vestibular-lesioned patients and healthy participants. Unilateral acute and chronic patients, bilateral patients, and healthy subjects were compared...
April 22, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28422641/supporting-stroke-motor-recovery-through-a-mobile-application-a-pilot-study
#11
Sonia Lawson, Ziying Tang, Jinjuan Feng
Neuroplasticity and motor learning are promoted with repetitive movement, appropriate challenge, and performance feedback. ARMStrokes, a smartphone application, incorporates these qualities to support motor recovery. Engaging exercises are easily accessible for improved compliance. In a multiple-case, mixed-methods pilot study, the potential of this technology for stroke motor recovery was examined. Exercises calibrated to the participant's skill level targeted forearm, elbow, and shoulder motions for a 6-wk protocol...
May 2017: American Journal of Occupational Therapy: Official Publication of the American Occupational Therapy Association
https://www.readbyqxmd.com/read/28420605/scalable-passive-sleep-monitoring-using-mobile-phones-opportunities-and-obstacles
#12
Sohrab Saeb, Thaddeus R Cybulski, Stephen M Schueller, Konrad P Kording, David C Mohr
BACKGROUND: Sleep is a critical aspect of people's well-being and as such assessing sleep is an important indicator of a person's health. Traditional methods of sleep assessment are either time- and resource-intensive or suffer from self-reporting biases. Recently, researchers have started to use mobile phones to passively assess sleep in individuals' daily lives. However, this work remains in its early stages, having only examined relatively small and homogeneous populations in carefully controlled contexts...
April 18, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28318394/effect-of-foot-and-ankle-immobilization-on-able-bodied-gait-as-a-model-to-increase-understanding-about-bilateral-transtibial-amputee-gait
#13
Antonia Nepomuceno, Matthew J Major, Rebecca Stine, Steven Gard
BACKGROUND: The anatomical foot-ankle complex facilitates advancement of the stance limb through foot rockers and late-stance power generation during walking, but this mechanism is altered for persons with bilateral transtibial amputation when using passive prostheses. OBJECTIVES: To study the effects of bilateral foot and ankle immobilization on able-bodied gait to serve as a model for understanding gait of persons with bilateral transtibial amputation and associated compensatory mechanisms...
March 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28279850/accuracy-and-repeatability-of-single-pose-calibration-of-inertial-measurement-units-for-whole-body-motion-analysis
#14
Xavier Robert-Lachaine, Hakim Mecheri, Christian Larue, André Plamondon
Portable inertial measurement units (IMUs) are suitable for motion analysis outside the laboratory. However, IMUs depend on the calibration of each body segment to measure human movement. Different calibration approaches have been developed for simplicity of use or similarity to laboratory motion analysis, but they have not been extensively examined. The main objective of the study was to determine the accuracy and repeatability of two common single-pose calibrations (N-pose and T-pose) under different conditions of placement (self-placement and passive placement), as well as their similarity to laboratory analysis based on anatomical landmarks...
March 1, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28271408/moving-or-being-moved-that-makes-a-difference
#15
Hans Straka, Boris P Chagnaud
During head/body movements, gaze stability is ensured by transformation of motion-related sensory signals into respective motor commands. Passively induced motion in all vertebrates including amphibians evokes a robust vestibulo-ocular reflex, suggesting an equally important role of this motor reaction during actively induced motion. However, during self-induced movements including locomotion, motor efference copies offer a convenient additional substrate for counteracting retinal image displacements. During such locomotor activity in Xenopus laevis tadpoles, spinal central pattern generator-derived efference copies elicit spatio-temporally specific eye movements, which are functionally appropriate to offset swimming-related retinal image displacements...
March 7, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28249347/patient-self-assessed-passive-range-of-motion-of-the-knee-cannot-replace-health-professional-measurements
#16
Jens Borgbjerg, Frank Madsen, Anders Odgaard
The purpose of this study was to investigate whether patients can accurately self-assess their knee passive range of motion (PROM). A picture-based questionnaire for patient self-assessment of knee PROM was developed and posted to patients. The self-assessed PROM from 58 patients was compared with surgeon-assessed PROM using a short-arm goniometer. Agreement between the measurement methods was calculated with the Bland-Altman method. We calculated the sensitivity and specificity of patient-assessed PROM in dichotomously detecting knee motion impairment in both flexion (≤ 100 degrees) and extension (≥ 10-degree flexion contracture)...
March 1, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28210065/the-effects-of-therapeutic-exercise-using-pnf-on-the-size-of-calcium-deposits-pain-self-awareness-and-shoulder-joint-function-in-a-calcific-tendinitis-patient-a-case-study
#17
Dong-Gun Oh, Kyung-Tae Yoo
[Purpose] The purpose of this case study was to identify the effects of independent and intensive therapeutic exercise using Proprioceptive neuromuscular facilitation on the size of calcium deposits, pain self-awareness, and shoulder joint function in a patient with calcific tendonitis. [Subject and Methods] The subject was a 42-year-old female patient with calcific tendonitis and acute pain who had difficulty with active movement and problems with general function. The independent and intensive Proprioceptive neuromuscular facilitation exercise was applied for 40 min twice a day five times a week for two weeks for a total of 20 times...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28205508/global-dynamics-of-non-equilibrium-gliding-in-animals
#18
Isaac Yeaton, Jake Socha, Shane Ross
Gliding flight - moving horizontally downward through the air without power - has evolved in a broad diversity of taxa and serves numerous ecologically relevant functions such as predator escape, expanding foraging locations, and finding mates, and has been suggested as an evolutionary pathway to powered flight. Historically, gliding has been conceptualized using the idealized conditions of equilibrium, in which the net aerodynamic force on the glider balances its weight. While this assumption is appealing for its simplicity, recent studies of glide trajectories have shown that equilibrium gliding is not the norm for most species...
February 16, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28167184/is-self-massage-an-effective-joint-range-of-motion-strategy-a-pilot-study
#19
Estêvão Rios Monteiro, Mark Tyler Cavanaugh, David Michael Frost, Jefferson da Silva Novaes
Increases in joint range of motion may be beneficial in both improving performance and reducing the risk of injury. The purpose of this study was to investigate short-term changes in passive hip flexion (HF) and extension (HE) after foam rolling (FR) and roller massage (RM) durations of 60 and 120s. Ten recreationally active men (27.6 ± 2.4 years old; 164.8 ± 6.6 cm; 62.2 ± 8.0 kg; 24.2 ± 2.1 m(2)/kg) were recruited for this study. Subjects performed foam rolling (FR) and roller massage (RM) on the hamstrings for 60 (FR60 and RM60) and 120 (FR120 and RM120) seconds...
January 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28152452/upper-extremity-motion-during-gait-in-adolescents-with-structural-leg-length-discrepancy-an-exploratory-study
#20
Fabiola Angelico, Marie Freslier, Jacqueline Romkes, Reinald Brunner, Stefan Schmid
BACKGROUND AND PURPOSE: Depending on the extent of a structural leg length discrepancy (LLD), several compensatory mechanisms take place in order to maintain function and to optimize energy consumption during gait. However, studies describing the influence of a structural LLD on upper limb motion are lacking. The current study therefore aimed at the evaluation of upper limb motion during gait in LLD patients compared to healthy controls. METHODS: Motion capture data from 14 patients with structural LLD and 15 healthy controls that were collected during barefoot walking at a self-selected speed were retrospectively analyzed...
January 4, 2017: Gait & Posture
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