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https://www.readbyqxmd.com/read/28814000/preliminary-study-of-a-robotic-foot-ankle-prosthesis-with-active-alignment
#1
Andrew K LaPre, Ryan D Wedge, Brian R Umberger, Frank C Sup
Robotic prosthetic foot-ankle prostheses typically aim to replace the lost joint with revolute joints aimed at replicating normal joint biomechanics. In this paper, a previously developed robotic ankle prosthesis with active alignment is evaluated. It uses a four-bar mechanism to inject positive power into the gait cycle while altering the kinematics of the ankle joint and pylon segment to reduce loading on the residual limb. In a single-subject biomechanics analysis, there was a 10% reduction in peak limb pressures and evidence of greater gait symmetry in ground reaction forces when active alignment was implemented compared to walking with the daily use prosthesis...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813956/semi-autonomous-mobility-assistance-for-power-wheelchair-users-navigating-crowded-environments
#2
Daniel Ashley, Kyle Ashley, Redwan Alqasemi, Rajiv Dubey
Power wheelchair users suffering from cognitive or physical impairment often face difficulties in maneuvering their wheelchairs through crowded environments. Currently, users need to be continuously aware of all traffic around them to actively avoid all collisions. This is an especially difficult task since many wheelchair users are unable to accurately view or perceive their surroundings. Additionally, imprecise joystick control, slowed reaction time, or imperfect interpretation of the environment can lead to unintended collisions with objects in the environment...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813923/a-real-time-and-reduced-complexity-approach-to-the-detection-and-monitoring-of-static-joint-overloading-in-humans
#3
Wansoo Kim, Jinoh Lee, Nikos Tsagarakis, Arash Ajoudani
This paper proposes a novel technique for the real-time estimation of the joint torques variations in humans while performing heavy manipulation tasks. To achieve this, the method is based on the deviations of the Centre of Pressure (CoP) and Ground Reaction Force (GRF) in the presence of interaction forces. The CoP and GRF variations are calculated from the difference between the estimated values (assuming no interaction forces) using a pre-identified statically equivalent serial chain (SESC) and the measured ones (with the effect of interaction forces) using an external device...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813868/relationship-between-assistive-torque-and-knee-biomechanics-during-exoskeleton-walking-in-individuals-with-crouch-gait
#4
Zachary F Lerner, Diane L Damiano, Thomas C Bulea
Crouch or "flexed knee" gait is a pathological gait pattern affecting many individuals with cerebral palsy. One proposed method to alleviate crouch is to provide robotic assistance to knee extension during walking. The purpose of this study was to evaluate how the magnitude of knee extensor torque affects knee kinematics, kinetics, and muscle activity. Motion capture, ground reaction force and electromyography data were collected while four participants with crouch gait from cerebral palsy walked with assistance from a novel robotic exoskeleton on an instrumented treadmill...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813856/quantifying-the-benefit-of-the-kinetic-crutch-tip
#5
Fatemeh Rasouli, David Huizenga, Tim Hess, Ismet Handzic, Kyle B Reed
This research focuses on the difference between the Kinetic Crutch Tip (KCT) and a Standard Rubber Tip. Additionally, the effect of KCT stiffness on the crutch gait cycle and the reaction forces were investigated. This study also examined the maximum backward angle that a crutch is able to move forward without any external forces as well as the ratio of positive to negative horizontal forces were considered. The results were obtained in two ways: one by having subjects walk on the crutches and another to reduce the variability of human walking by measuring the resulting motion only using weights attached to the crutch tip...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813855/an-optimized-design-of-a-parallel-robot-for-gait-training
#6
Marco Maddalena, Mozafar Saadat, Alireza Rastegarpanah, Rui C V Loureiro
The guidelines for enhancing robot-assisted training for post-stroke survivors head towards increasing exercise realism and variability; in particular lower limb rehabilitation needs the patient to feel challenged to adapt his locomotion and dynamic balance capabilities to different virtual ground scenarios. This paper proposes a design for a robot whose end-effector acts as a footplate to be in permanent contact with the user's foot during practice: the structure is such that it enables the user's foot to rotate around three axis, differently from what is currently available in the research for gait training; the parallel kinematic structure and the dimensional synthesis allow a suitable range of motion and aim at limiting device mass, footprint and reaction forces on the actuators when rendering virtual ground...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813849/effects-of-partial-body-weight-support-and-functional-electrical-stimulation-on-gait-characteristics-during-treadmill-locomotion-pros-and-cons-of-saddle-seat-type-body-weight-support
#7
Natsumi Kataoka, Hiroaki Hirai, Taya Hamilton, Fumiaki Yoshikawa, Akira Kuroiwa, Yuma Nagakawa, Eichi Watanabe, Yudai Ninomaru, Yuri Saeki, Mitsunori Uemura, Fumio Miyazaki, Hiroshi Nakata, Tomoki Nishi, Hiroaki Naritomi, Hermano Igo Krebs
Robotic therapy for rehabilitation of the lower extremity is currently in its early stage of development. Aiming at exploring an efficacious intervention for gait rehabilitation, we investigate the characteristics of an end-effector gait-training device that combines saddle-seat-type body-weight-supported treadmill training with functional electrical stimulation (FES). This is a task-oriented approach to restoring voluntary control of locomotion in patients with neuromuscular diseases. We evaluate the differences between walking with saddle-seat-type support and with harness-type support, in terms of personal preference, the preferred walking speed, profiles of kinematics and ground reaction force, and the effectiveness of FES...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813846/closed-loop-emg-informed-model-based-analysis-of-human-musculoskeletal-mechanics-on-rough-terrains
#8
C Varotto, Z Sawacha, L Gizzi, D Farina, M Sartori
This work aims at estimating the musculoskeletal forces acting in the human lower extremity during locomotion on rough terrains. We employ computational models of the human neuro-musculoskeletal system that are informed by multi-modal movement data including foot-ground reaction forces, 3D marker trajectories and lower extremity electromyograms (EMG). Data were recorded from one healthy subject locomoting on rough grounds realized using foam rubber blocks of different heights. Blocks arrangement was randomized across all locomotion trials to prevent adaptation to specific ground morphology...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813824/the-effect-of-haptic-interaction-between-balance-assessment-robot-and-pelvis-on-muscle-activation-of-leg-muscles
#9
Andrej Olensek, Matjaz Zadravec, Zlatko Matjacic
Admittance control is considered as a promising paradigm in rehabilitation that provides us with means to establish well controlled and adjustable interaction and cooperation between rehabilitation devices and patients. Recently we developed balance assessment robot (BAR) for studying postural responses during walking as well as for pelvis manipulation during walking that implements admittance control as a mean of interaction with user. In this study we evaluated the characteristics of transparent haptic interaction and investigated whether transparent haptic interaction induces adaptations in muscle activation patterns with respect to free walking...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813821/gait-training-assist-system-of-a-lower-limb-prosthetic-visualizing-muscle-activation-pattern-using-a-color-depth-sensor
#10
Kunihiro Ogata, Tomoki Mita, Toshiaki Tsuji, Yoshio Matsumoto
Some unilateral lower-limb amputees load the intact limb more than the prosthetic limb. This can cause chronic pains, fatigue, lumbago, and joint diseases, including knee osteoarthritis. To avoid and counteract these symptoms it is necessary to improve their asymmetric gait. Increasing the function of the hip abductor muscle is important to maintaining symmetrical weight distribution. Therefore, the purpose of this study is to develop a training assist system, which estimates and visualizes an abductor muscle by using a color-depth sensor...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813779/dna-profiling-of-leuconostoc-citreum-strains-in-fermented-foods-by-repetitive-element-polymerase-chain-reaction
#11
Jasmine Kaur, Anshul Sharma, Sulhee Lee, Young-Seo Park
To identify and discriminate the bacterial species at the sub-specific level, rep-PCR method is a reliable genomic fingerprinting tool. Fourteen strains of bacteria were isolated from different food sources, identified as Leuconostoc citreum using 16S rRNA gene sequencing and amplified using rep-primers (REP, ERIC, and (GTG)5). Fingerprinting patterns generated band range in between 300-6000 bp with REP, 150-6000bp with ERIC and 200-1700 bp with (GTG)5 primers respectively. In UPGMA dendrogram analysis, 14 strains were clustered into three clades (I, II and III) with all the primers, thus differentiating them at the molecular level...
August 17, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28813772/pilot-study-to-determine-safety-and-efficacy-of-paclitaxel-infusion-in-de-novo-peripheral-lesions-using-the-atrium-clearway-balloon
#12
Joseph Anderson, Laura Danielson, Jodan Anderson, Katie Pohlson, Tyler Remund, Chad Laurich, Greg Schultz, Angelo Santos, Gopinath Mani, Patrick Kelly, Andrea Shermann
OBJECTIVE: To evaluate the safety and efficacy of a one-time infusion of paclitaxel through an Atrium ClearWay balloon in infra inguinal de novo peripheral lesions. METHODS: This is a single-center prospective study looking at treatment of 50 limbs. Treatment includes standard infra inguinal endovascular revascularization followed by a pre-prescribed infusion of paclitaxel. Control is standard reintervention without subsequent paclitaxel infusion. Patients were followed at one, four, and 10 months with ankle-brachial index (ABI)s, arterial duplex of the treated limb, and Rutherford classification stage measured before and after procedures and at each follow-up...
March 2017: South Dakota Medicine: the Journal of the South Dakota State Medical Association
https://www.readbyqxmd.com/read/28813703/efficacy-and-safety-of-adjuvant-treatment-with-entacapone-in-advanced-parkinson-s-disease-with-motor-fluctuation-a-systematic-meta-analysis
#13
Jia Li, Zhiwei Lou, Xiaoyang Liu, Yajuan Sun, Jiajun Chen
AIMS: To assess the efficacy and safety of adjuvant treatment with entacapone in the treatment of later Parkinson's disease (PD) patients with motor fluctuation. METHODS: We conducted a systematic review of relevant studies from 8 databases to June 23, 2016. RESULTS: Fourteen studies were included in this review (n = 2,804). The results showed that compared with placebo, adjuvant therapy with entacapone significantly increased on time (p < 0...
August 16, 2017: European Neurology
https://www.readbyqxmd.com/read/28813689/large-scale-machine-learning-of-media-outlets-for-understanding-public-reactions-to-nation-wide-viral-infection-outbreaks
#14
Sungwoon Choi, Jangho Lee, Min-Gyu Kang, Hyeyoung Min, Yoon-Seok Chang, Sungroh Yoon
From May to July 2015, there was a nation-wide outbreak of Middle East respiratory syndrome (MERS) in Korea. MERS is caused by MERS-CoV, an enveloped, positive-sense, single stranded RNA virus belonging to the family Coronaviridae. Despite expert opinions that the danger of MERS might be exaggerated, there was an overreaction by the public according to the Korean mass media, which led to a noticeable reduction in social and economic activities during the outbreak. To explain this phenomenon, we presumed that machine learning-based analysis of media outlets would be helpful and collected a number of Korean mass media articles and short-text comments produced during the 10-week outbreak...
August 13, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28813645/lat-is-essential-for-the-mast-cell-stabilising-effect-of-thga-in-ige-mediated-mast-cell-activation
#15
Ji Wei Tan, Daud Ahmad Israf, Nur Fariesha Md Hashim, Yoke Kqueen Cheah, Hanis Hazeera Harith, Khozirah Shaari, Chau Ling Tham
Mast cells play a central role in the pathogenesis of allergic reaction. Activation of mast cells by antigens is strictly dependent on the influx of extracellular calcium that involves a complex interaction between signalling molecules located within the cells. We have previously reported that tHGA, an active compound originally isolated from a local shrub known as Melicope ptelefolia, prevented IgE-mediated mast cell activation and passive systemic anaphylaxis by suppressing the release of interleukin-4 (IL-4) and tumour necrosis factor (TNF)-α from activated rat basophilic leukaemia (RBL)-2H3 cells...
August 13, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28813604/experimental-study-and-mathematical-modeling-of-self-sustained-kinetic-oscillations-in-catalytic-oxidation-of-methane-over-nickel
#16
Elena A Lashina, Vasily V Kaichev, Andrey Aleksandrovich Saraev, Zakhar S Vinokurov, Nataliya A Chumakova, Gennadii Chumakov, Valerii I Bukhtiyarov
The self-sustained kinetic oscillations in the oxidation of CH4 over Ni foil have been studied at atmospheric pressure using an X-ray diffraction technique and mass spectrometry. It has been shown that the regular oscillations appear under oxygen-deficient conditions; CO, CO2, H2, and H2O are detected as the products. According to in situ X-ray diffraction measurements nickel periodically oxidizes to NiO initiating the reaction-rate oscillations. To describe the oscillations we have proposed a 5-stage mechanism of the partial oxidation of methane over Ni and a corresponding three-variable kinetic model...
August 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28813598/functional-microcapsules-with-hybrid-shells-made-via-sol-gel-reaction-within-double-emulsions
#17
David G Moore, Jonathan V A Brignoli, Patrick Alberto Rühs, André R Studart
Microcapsules with organic-inorganic hybrid shells can be used as functionally-responsive delivery systems that are attractive for a broad range of applications. Hybrid-shell microcapsules have often been synthesized by the assembly of solid inorganic nanoparticles and polymers. Efforts to extend this approach to microfluidic emulsification have been hampered by problems with clogging and flow instabilities when utilizing dispersions of solid particles. In this work, hybrid shell microcapsules are synthesized through the reaction of liquid precursors, eliminating the use of solid dispersions...
August 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28813595/activation-of-a-nickel-based-oer-catalyst-on-a-hematite-photoanode-via-incorporation-of-cerium-for-photoelectrochemical-water-oxidation
#18
Hyungseob Lim, Jae Young Kim, Edward J Evans, Amritesh Rai, Jun-Hyuk Kim, Bryan R Wygant, Charles Buddie Mullins
There has been debate on whether Ni(OH)2 is truly catalytically active for the photo/-electrocatalytic oxygen evolution reaction. In this report, we have synthesized a Ni(OH)2 co-catalyst on a hematite photoanode and showed that, as has been proposed in other studies, the current density varies as a function of scan rate, which arise due to a photo-induced capacitive charging effect. We have discovered that this photo-induced charging of Ni2+/3+ can be overcome by mixing cerium nitrate into the Ni precursor solution...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28813593/ptni-nanocrystals-supported-on-hollow-carbon-spheres-enhancing-the-electrocatalytic-performance-through-high-temperature-annealing-and-electrochemical-co-stripping-treatments
#19
Chunmei Zhang, Ruizhong Zhang, Xiaokun Li, Wei Chen
PtNi nanoparticles have been proved to be a type of highly efficient electrocatalyst for the oxygen reduction reaction (ORR) among the Pt-based nanomaterials. However, how to improve the surface catalytic activity and stability of polymer-stabilized Pt-based nanocrystals is still a critical issue for their application in fuel cells. In this work, a one-step solvothermal process was used to synthesize PVP-stabilized PtNi nanocubes supported on hollow carbon spheres. With optimized metal precursor ratio (Pt/Ni=1:1) and solvothermal temperature (130 oC), PtNi nanocrystals with uniform size and cubic shape can be synthesized and highly dispersed on hollow carbon spheres...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28813588/insight-to-the-thermal-decomposition-and-hydrogen-desorption-behaviors-of-nanh2-nabh4-hydrogen-storage-composite
#20
Ziwei Pei, Ying Bai, Yue Wang, Feng Wu, Chuan Wu
The light-weight compound material NaNH2-NaBH4 is regarded as a promising hydrogen storage composite due to the high hydrogen density. Mechanical ball-milling was employed to synthesize the composite NaNH2-NaBH4 (2/1 molar ratio), and the samples were investigated utilizing Thermogravimetric-differential thermal analysis-mass spectroscopy (TG-DTA-MS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses. The full-spectrum test (range of the ratio of mass to charge: 0-200) shows that the released gaseous species contain H2, NH3, B2H6 and N2 in the heating process from room temperature to 400 °C, and possibly the impurity gas B6H12 also exists...
August 16, 2017: ACS Applied Materials & Interfaces
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