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https://www.readbyqxmd.com/read/29140169/relationship-between-physical-therapy-characteristics-surgical-procedure-and-clinical-outcomes-in-patients-after-acl-reconstruction
#1
Ian J Dempsey, Grant E Norte, Matthew Hall, John Goetschius, Lindsay V Slater, Jourdan M Cancienne, Brian C Werner, David R Diduch, Joseph M Hart
CONTEXT: Post-operative rehabilitation is critical to optimize outcomes after anterior cruciate ligament reconstruction (ACLR). However, the relationship between physical therapy (PT) and clinical outcomes is unclear. OBJECTIVE: To describe PT characteristics following ACLR, and assess the relationships between PT characteristics, surgical procedure, and clinical outcomes. DESIGN: Cross-sectional. SETTING: Laboratory...
November 15, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29109821/in-situ-sem-torsion-test-of-metallic-glass-microwires-based-on-micro-robotic-manipulation
#2
Chenchen Jiang, Haojian Lu, Ke Cao, Wenfeng Wan, Yajing Shen, Yang Lu
Microwires, such as metallic, semiconductor, and polymer microwires and carbon fibers, have stimulated great interest due to their importance in various structural and functional applications. Particularly, metallic glass (MG) microwires, because of their amorphous atoms arrangement, have some unique mechanical properties compared with traditional metals. Despite the fact that substantial research efforts have been made on the mechanical characterizations of metallic glass microwires under tension or flexural bending, the mechanical properties of microwires under torsional loading have not been well studied, mainly due to the experimental difficulties, such as the detection of torsion angle, quantitative measurement of the torsional load, and the alignment between the specimen and torque meter...
2017: Scanning
https://www.readbyqxmd.com/read/29080855/rheological-analysis-of-itraconazole-polymer-mixtures-to-determine-optimal-melt-extrusion-temperature-for-development-of-amorphous-solid-dispersion
#3
Nayan Solanki, Simerdeep Singh Gupta, Abu T M Serajuddin
The objective of this investigation was to develop a systematic method for the determination of optimal processing temperatures of drug-polymer mixtures for the development of amorphous solid dispersion (ASD) by melt extrusion. Since melt extrusion is performed at high temperature, it is essential that the processing temperature should be as low as possible to minimize degradation of drug and polymer, and yet the temperature should be high enough that the drug-polymer mixture attains certain viscosity that is extrudable and the drug dissolves in the molten polymer...
October 30, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29044190/a-high-speed-single-sideband-generator-using-a-magnetic-tunnel-junction-spin-torque-nano-oscillator
#4
Raghav Sharma, Naveen Sisodia, Ezio Iacocca, Ahmad A Awad, Johan Åkerman, P K Muduli
An important property of spin-torque nano-oscillators (STNOs) is their ability to produce a frequency modulated (FM) signal, which is very critical for communication applications. We here demonstrate a novel single sideband (SSB) modulation phenomenon using a magnetic tunnel junction (MTJ)-based STNO, which saves transmission bandwidth and in principle should minimize attenuation for wireless communication. Experimentally, lower single sidebands (LSSBs) have been successfully demonstrated over a wide range of modulation frequency, f m  = 150 MHz-1 GHz...
October 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29027416/-application-of-quality-by-design-in-granulation-process-for-ginkgo-leaf-tablet-%C3%A2-%C3%AF-influence-and-control-of-raw-materials-quality-variation
#5
Xiang-Long Cui, Bing Xu, Jun-Wen Liu, Guo-Lin Shi, Xin-Yuan Shi, Yan-Jiang Qiao
Raw materials' quality variation could affect the quality consistency of product and the clinical efficacy. In this paper, the high shear wet granulation (HSWG) process of the ginkgo leaf tablet was taken as the research object. Ginkgo biloba extracts and excipients microcrystalline cellulose collected from various sources and batches were used to simulate raw materials' quality variation. Real-time torque was recorded to analyze the viscosity of the wetting mass, and then by combining with physical fingerprint, the impact of physical quality variation of powders on granule properties could be investigated...
March 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29024603/exercise-tolerance-during-muscle-contractions-below-and-above-the-critical-torque-in-different-muscle-groups
#6
Leonardo Henrique Perinotto Abdalla, Benedito Sérgio Denadai, Natalia Menezes Bassan, Camila Coelho Greco
The objective of this study was to test the hypotheses that end-test torque (ET) (expressed as % maximal voluntary contraction - MVC) is higher for plantar flexors (PF) than knee extensors (KE) muscles, whereas impulse above ET (IET) is higher for KE than PF. Thus, we expected that exercise tolerance would be longer for KE than PF only during the exercise performed above ET. After the determination of MVC, forty men performed two 5-min all-out tests to determine ET and IET. Eleven participants performed a further four intermittent isometric tests, to exhaustion, at ET + 5% and ET - 5%, and one test for KE at the exercise intensity (%MVC) corresponding to ET + 5% of PF...
October 12, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28952502/finite-element-simulation-of-niti-umbrella-shaped-implant-used-on-femoral-head-under-different-loadings
#7
Reza Mehrabi, Milad Dorri, Mohammad Elahinia
In this study, an umbrella-shaped device that is used for osteonecrosis treatment is simulated. The femoral head is subjected to various complex loadings as a result of a person's daily movements. Implant devices used in the body are made of shape memory alloy materials because of their remarkable resistance to wear and corrosion, good biocompatibility, and variable mechanical properties. Since this NiTi umbrella-shaped implant is simultaneously under several loadings, a 3-D model of shape memory alloy is utilized to investigate the behavior of the implant under different conditions...
March 12, 2017: Bioengineering
https://www.readbyqxmd.com/read/28942894/wavelet-based-information-filtering-for-fault-diagnosis-of-electric-drive-systems-in-electric-ships
#8
Andre A Silva, Shalabh Gupta, Ali M Bazzi, Arthur Ulatowski
Electric machines and drives have enjoyed extensive applications in the field of electric vehicles (e.g., electric ships, boats, cars, and underwater vessels) due to their ease of scalability and wide range of operating conditions. This stems from their ability to generate the desired torque and power levels for propulsion under various external load conditions. However, as with the most electrical systems, the electric drives are prone to component failures that can degrade their performance, reduce the efficiency, and require expensive maintenance...
September 21, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28942167/cracks-in-dried-deposits-of-hematite-ellipsoids-interplay-between-magnetic-and-hydrodynamic-torques
#9
Hisay Lama, Ranajit Mondal, Madivala G Basavaraj, Dillip K Satapathy
The orientation and morphology of cracks in coffee-ring like particulate deposit obtained by drying sessile drops containing anisotropic magnetic particles strongly depends on the magnitude of the applied magnetic field and its direction. This opens up the possibility of tuning the micro-structure of cracks via suitable manipulation of magnetic and hydrodynamic torques on the particles which has potential applications in nano-fabrication and field driven self-assembly. We report a systematic study of magnetic field driven self-assembly of hematite ellipsoids in sessile drops dried on solid substrates and resulting crack patterns...
January 15, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28900719/the-effects-of-exercise-induced-muscle-damage-on-critical-torque
#10
Marcin K Szczyglowski, Carl J Ade, Jason A Campbell, Christopher D Black
OBJECTIVE: Exercise-induced muscle damage (EIMD) has been shown to reduce endurance exercise performance. This study examined the effects of EIMD on critical torque (CT) and the sum of the torque integral above CT during (∫ T total) during a 5-min all-out, intermittent isometric knee extension exercise. METHODS: CT was determined in eight participants prior to and 48-h following EIMD. EIMD was induced using electrically stimulated eccentric knee extensions until maximal voluntary strength (MVC) was reduced by 40%...
November 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28900151/in-situ-vocal-fold-properties-and-pitch-prediction-by-dynamic-actuation-of-the-songbird-syrinx
#11
Daniel N Düring, Benjamin J Knörlein, Coen P H Elemans
The biomechanics of sound production forms an integral part of the neuromechanical control loop of avian vocal motor control. However, we critically lack quantification of basic biomechanical parameters describing the vocal organ, the syrinx, such as material properties of syringeal elements, forces and torques exerted on, and motion of the syringeal skeleton during song. Here, we present a novel marker-based 3D stereoscopic imaging technique to reconstruct 3D motion of servo-controlled actuation of syringeal muscle insertions sites in vitro and focus on two muscles controlling sound pitch...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28891043/treamed-locked-intramedullary-nailing-for-studying-femur-fracture-and-its-complications
#12
O Yoshino, J Brady, K Young, B Hardy, R Matthys, T Buxton, R Appleyard, J Tomka, D Dabirrahmani, P Woodford, M Fadia, R Steck, A Quail, R G Richards, Z J Balogh
Morbidity associated with femur fractures in polytrauma patients is known to be high. The many unsolved clinical questions include the immunological effect of the fracture and its fixation, timing of fracture fixation, management of fracture non-union, effect of infection and critical size of bone defects. The aim of this study was to establish a clinically-relevant and reproducible animal model with regards to histological, biomechanical and radiological changes during bone healing. A custom-designed intramedullary nail with interlocking system (RabbitNail, RISystem AG, Davos Platz, Switzerland) was used for fixation, following femur fracture...
September 11, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/28846654/can-magnesium-enhance-exercise-performance
#13
REVIEW
Yijia Zhang, Pengcheng Xun, Ru Wang, Lijuan Mao, Ka He
Magnesium (Mg) is an essential mineral that plays a critical role in the human body. It takes part in the process of energy metabolism and assists the maintenance of normal muscle function. A number of studies evaluated the association between Mg status/supplementation and exercise performance and found that the need for Mg increased as individuals' physical activity level went up. Animal studies indicated that Mg might improve exercise performance via enhancing glucose availability in the brain, muscle and blood; and reducing/delaying lactate accumulation in the muscle...
August 28, 2017: Nutrients
https://www.readbyqxmd.com/read/28813869/effects-of-assistance-timing-on-metabolic-cost-assistance-power-and-gait-parameters-for-a-hip-type-exoskeleton
#14
Jusuk Lee, Keehong Seo, Bokman Lim, Junwon Jang, Kyungrock Kim, Hyundo Choi
There are many important factors in developing an exoskeleton for assisting human locomotion. For example, the weight should be sufficiently light, the assist torque should be high enough to assist joint motion, and the assistance timing should be just right. Understanding how these design parameters affect overall performance of a complex human-machine system is critical for the development of these types of systems. The present study introduces an assistance timing controller that regulates assistance timing such that peak joint velocity and peak assistance power are offset by a reference value for our hip-type exoskeleton...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28783723/electronic-in-plane-symmetry-breaking-at-field-tuned-quantum-criticality-in-cerhin5
#15
F Ronning, T Helm, K R Shirer, M D Bachmann, L Balicas, M K Chan, B J Ramshaw, R D McDonald, F F Balakirev, M Jaime, E D Bauer, P J W Moll
Electronic nematic materials are characterized by a lowered symmetry of the electronic system compared to the underlying lattice, in analogy to the directional alignment without translational order in nematic liquid crystals. Such nematic phases appear in the copper- and iron-based high-temperature superconductors, and their role in establishing superconductivity remains an open question. Nematicity may take an active part, cooperating or competing with superconductivity, or may appear accidentally in such systems...
August 17, 2017: Nature
https://www.readbyqxmd.com/read/28775263/high-power-and-low-critical-current-density-spin-transfer-torque-nano-oscillators-using-mgo-barriers-with-intermediate-thickness
#16
J D Costa, S Serrano-Guisan, B Lacoste, A S Jenkins, T Böhnert, M Tarequzzaman, J Borme, F L Deepak, E Paz, J Ventura, R Ferreira, P P Freitas
Reported steady-state microwave emission in magnetic tunnel junction (MTJ)-based spin transfer torque nano-oscillators (STNOs) relies mostly on very thin insulating barriers [resulting in a resistance × area product (R × A) of ~1 Ωμm(2)] that can sustain large current densities and thus trigger large orbit magnetic dynamics. Apart from the low R × A requirement, the role of the tunnel barrier in the dynamics has so far been largely overlooked, in comparison to the magnetic configuration of STNOs...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28626763/implant-stability-in-the-posterior-maxilla-a-controlled-clinical-trial
#17
Raquel Zita Gomes, Mario Ramalho de Vasconcelos, Isabel Maria Lopes Guerra, Rute Alexandra Borges de Almeida, Antonio Cabral de Campos Felino
AIM: To evaluate the primary and secondary stability of implants in the posterior maxilla. METHODS: Patients were allocated into three groups: (A) native bone, (B) partially regenerated bone, and (C) nearly totally regenerated bone. Insertion torque (IT) and implant stability quotient (ISQ) were measured at placement, to evaluate whether satisfactory high primary stability (IT ≥ 45 N/cm; ISQ ≥ 60) was achieved; ISQ was measured 15, 30, 45, and 60 days after placement, to investigate the evolution to secondary stability...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28576112/periodic-nonlinear-sliding-modes-for-two-uniformly-magnetized-spheres
#18
Boyd F Edwards, John M Edwards
A uniformly magnetized sphere slides without friction along the surface of a second, identical sphere that is held fixed in space, subject to the magnetic force and torque of the fixed sphere and the normal force. The free sphere has two stable equilibrium positions and two unstable equilibrium positions. Two small-amplitude oscillatory modes describe the sliding motion of the free sphere near each stable equilibrium, and an unstable oscillatory mode describes the motion near each unstable equilibrium. The three oscillatory modes remain periodic at finite amplitudes, one bifurcating into mixed modes and circumnavigating the free sphere at large energies...
May 2017: Chaos
https://www.readbyqxmd.com/read/28571442/design-and-analysis-of-an-mr-rotary-brake-for-self-regulating-braking-torques
#19
Dongwon Yun, Jeong-Hoi Koo
This paper presents a novel Magneto-rheological (MR) brake system that can self-regulate the output braking torques. The proposed MR brake can generate a braking torque at a critical rotation speed without an external power source, sensors, or controllers, making it a simple and cost-effective device. The brake system consists of a rotary disk, permanent magnets, springs, and MR fluid. The permanent magnets are attached to the rotary disk via the springs, and they move outward through grooves with two different gap distances along the radial direction of the stator due to the centrifugal force...
May 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28526174/twist-buckling-of-veins-under-torsional-loading
#20
Justin R Garcia, Arnav Sanyal, Fatemeh Fatemifar, Mohammad Mottahedi, Hai-Chao Han
Veins are often subjected to torsion and twisted veins can hinder and disrupt normal blood flow but their mechanical behavior under torsion is poorly understood. The objective of this study was to investigate the twist deformation and buckling behavior of veins under torsion. Twist buckling tests were performed on porcine internal jugular veins (IJVs) and human great saphenous veins (GSVs) at various axial stretch ratio and lumen pressure conditions to determine their critical buckling torques and critical buckling twist angles...
June 14, 2017: Journal of Biomechanics
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