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https://www.readbyqxmd.com/read/29160691/bioinspired-tribotronic-resistive-switching-memory-for-self-powered-memorizing-mechanical-stimuli
#1
Yihui Sun, Xin Zheng, Xiaoqin Yan, Qingliang Liao, Shuo Liu, Guangjie Zhang, Yong Li, Yue Zhang
Haptic memory, from the interaction of skin and brain, can not only perceive external stimuli but also memorize it after removing the external stimuli. For the mimicry of human sensory memory, a self-powered artificial tactile memorizing system were developed by coupling bionic electronic skin and nonvolatile RRAM. The tribotronic nanogenerator is utilized as electronic skin to transform the touching signal into electric pulse, which will be programmed into the artificial brain: RRAM. Owing to the advanced structural designs and accurately parameter matching, including the output voltages and the resistances in different resistive states, the artificial brain can be operated at self-powered mode to memorize the touch stimuli with the responsivity up to 2000%...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29159354/self-assembled-nano-leaf-vein-bionic-structure-of-tio2-mos2-composites-for-photoelectric-sensors
#2
Qianyu Wang, Peng Yu, Lu Bai, Ruiying Bao, Ning Wang, Chuanbing Cheng, Zhengying Liu, Mingbo Yang, Wei Yang, Zhanhu Guo
Inspired by the leaf/vein structure of leaves which effectively supports the photosynthesis of green plants, a nano-leaf/vein bionic structure of self-assembled TiO2/MoS2 composites is applied to induce the reversible photochromic reactions of methylene blue (MB) for the first time. This reversible photochromic phenomenon gives a novel performance for the TiO2/MoS2 composites and expands their applications. Similar to the case where the natural vein network in leaves ensures the efficient material transfer and energy exchange for photosynthesis, the bionic internal MoS2 vein network in the composites ensures the efficient separation and directional transfer of photo-generated carriers to restrain the photocatalytic degradation reactions and to enhance the reversible photochromic reactions...
November 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/29156794/salen-mn-compounds-induces-cell-apoptosis-in-human-prostate-cancer-cells-through-promoting-ampk-activity-and-cell-autophagy
#3
Xiaoshuang Tang, Jing Jia, Feng Li, Wei Liu, Chao Yang, Bin Jin, Qi Shi, Xinyang Wang, Dalin He, Peng Guo
Currently only docetaxel has been approved to be used in the chemotherapy of prostate cancer and new drugs are urgent need. Salen-Mn is a novel type of synthetic reagent bionic and exerts remarkable anticancer activities. However, the effect of Salen-Mn on human prostate cancer has not been elucidated yet. In this study, we found that treatment of PC-3 and DU145 human prostate cancer cells with Salen-Mn inhibited cell growth in dose and time dependent manner. Moreover, Salen-Mn induced cell apoptosis, and increased the expression of apoptotic proteins, such as cleaved caspase-3, cleaved PARP, and Bax, in PC-3 and DU145 prostate cancer cells...
October 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29123373/the-structure-and-flexural-properties-of-typha-leaves
#4
Jingjing Liu, Zhihui Zhang, Zhenglei Yu, Yunhong Liang, Xiujuan Li, Luquan Ren
The Typha leaf has a structure of lightweight cantilever beam, exhibiting excellent mechanical properties with low density. Especially, the leaf blade evolved high strength and low density with high porosity. In this paper, the structure of Typha leaf was characterized by microcomputed tomography (Micro-CT) and scanning electron microscopy (SEM), and the relationship with flexural properties was analyzed. The three-point bending test was performed on leaves to examine flexural properties, which indicated that the flexural properties vary from the base to the apex in gradient...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29118571/crashworthiness-design-for-bionic-bumper-structures-inspired-by-cattail-and-bamboo
#5
Tao Xu, Nian Liu, Zhenglei Yu, Tianshuang Xu, Meng Zou
Many materials in nature exhibit excellent mechanical properties. In this study, we evaluated the bionic bumper structure models by using nonlinear finite element (FE) simulations for their crashworthiness under full-size impact loading. The structure contained the structural characteristics of cattail and bamboo. The results indicated that the bionic design enhances the specific energy absorption (SEA) of the bumper. The numerical results showed that the bionic cross-beam and bionic box of the bionic bumper have a significant effect on the crashworthiness of the structure...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29110547/robotic-exoskeletons-for-reengaging-in-everyday-activities-promises-pitfalls-and-opportunities
#6
Heather Fritz, Diane Patzer, Sujay S Galen
PURPOSE: Media images and marketing materials suggest a future in which individuals with spinal cord injury (SCI) can utilize robotic exoskeletons to reengage in everyday activities, yet these narratives may not align with the current technological realities. The purpose of this paper is to present and describe the current use of robotic exoskeletons in rehabilitation and home settings and discuss the benefits and limitations of the devices. MATERIALS AND METHODS: We provide an overview of the features and limitations of the four robotic exoskeleton products (EKSO Bionics, ReWalk, Rex Bionics, and Indego) that are currently being used in in the United States in rehabilitation settings...
November 7, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/29106311/impact-of-an-automated-bihormonal-delivery-system-on-psychosocial-outcomes-in-adults-with-type-1-diabetes
#7
Jill Weissberg-Benchell, Danielle Hessler, Lawrence Fisher, Steven J Russell, William H Polonsky
OBJECTIVES: The study assessed the psychosocial impact of the bihormonal bionic pancreas (BP) on adults in a real-world outpatient setting. RESEARCH DESIGN AND METHODS: Thirty-nine adults with type 1 diabetes at four study centers across the U.S. participated in a two-arm, random-order, crossover design study: 11 days with the BP and 11 days with their usual care (UC). Psychosocial questionnaires were administered before the first study arm, at the end of the first study arm, and at the end of the second study arm...
November 6, 2017: Diabetes Technology & Therapeutics
https://www.readbyqxmd.com/read/29105657/gait-training-after-spinal-cord-injury-safety-feasibility-and-gait-function-following-8-weeks-of-training-with-the-exoskeletons-from-ekso-bionics
#8
Carsten Bach Baunsgaard, Ulla Vig Nissen, Anne Katrin Brust, Angela Frotzler, Cornelia Ribeill, Yorck-Bernhard Kalke, Natacha León, Belén Gómez, Kersti Samuelsson, Wolfram Antepohl, Ulrika Holmström, Niklas Marklund, Thomas Glott, Arve Opheim, Jesus Benito, Narda Murillo, Janneke Nachtegaal, Willemijn Faber, Fin Biering-Sørensen
STUDY DESIGN: Prospective quasi-experimental study, pre- and post-design. OBJECTIVES: Assess safety, feasibility, training characteristics and changes in gait function for persons with spinal cord injury (SCI) using the robotic exoskeletons from Ekso Bionics. SETTING: Nine European rehabilitation centres. METHODS: Robotic exoskeleton gait training, three times weekly over 8 weeks. Time upright, time walking and steps in the device (training characteristics) were recorded longitudinally...
November 6, 2017: Spinal Cord
https://www.readbyqxmd.com/read/29104425/analysis-of-drag-reduction-methods-and-mechanisms-of-turbulent
#9
REVIEW
Gu Yunqing, Liu Tao, Mu Jiegang, Shi Zhengzan, Zhou Peijian
Turbulent flow is a difficult issue in fluid dynamics, the rules of which have not been totally revealed up to now. Fluid in turbulent state will result in a greater frictional force, which must consume great energy. Therefore, it is not only an important influence in saving energy and improving energy utilization rate but also an extensive application prospect in many fields, such as ship domain and aerospace. Firstly, bionic drag reduction technology is reviewed and is a hot research issue now, the drag reduction mechanism of body surface structure is analyzed, such as sharks, earthworms, and dolphins...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29097056/a-community-based-bionic-leg-rehabilitation-program-for-patients-with-chronic-stroke-clinical-trial-protocol
#10
Amy Wright, Keeron Stone, Danielle Lambrick, Simon Fryer, Lee Stoner, Edward Tasker, Simon Jobson, Grace Smith, John Batten, Jo Batey, Vicky Hudson, Helen Hobbs, James Faulkner
Stroke is a major global health problem whereby many survivors have unmet needs concerning mobility during recovery. As such, the use of robotic-assisted devices (i.e., a bionic leg) within a community setting may be an important adjunct to normal physiotherapy in chronic stroke survivors. This study will be a dual-center, randomized, parallel group clinical trial to investigate the impact of a community-based training program using a bionic leg on biomechanical, cardiovascular, and functional outcomes in stroke survivors...
October 30, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/29078797/dual-stimuli-responsive-fe3o4-graft-poly-acrylic-acid-block-poly-2-methacryloyloxyethyl-ferrocenecarboxylate-copolymer-micromicelles-surface-raft-synthesis-self-assembly-and-drug-release-applications
#11
Yuan Wang, Xue-Yin Zhang, Yan-Ling Luo, Feng Xu, Ya-Shao Chen, Yu-Yu Su
BACKGROUND: Stimuli-responsive polymer materials are a new kind of intelligent materials based on the concept of bionics, which exhibits more significant changes in physicochemical properties upon triggered by tiny environment stimuli, hence providing a good carrier platform for antitumor drug delivery. RESULTS: Dual stimuli-responsive Fe3O4 graft poly(acrylic acid)-block-poly(2-methacryloyloxyethyl ferrocenecarboxylate) block copolymers (Fe3O4-g-PAA-b-PMAEFC) were engineered and synthesized through a two-step sequential reversible addition-fragmentation chain transfer polymerization route...
October 27, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29073496/experimental-study-and-numerical-simulation-on-the-structural-and-mechanical-properties-of-typha-leaves-through-multimodal-microscopy-approaches
#12
Jingjing Liu, Zhihui Zhang, Zhenglei Yu, Yunhong Liang, Xiujuan Li, Luquan Ren
The Typha leaf, with special multi-level structure, low density and excellent mechanical properties, is an ideal bionic prototype utilized for lightweight design. In order to further study the relationship between the structure and mechanical properties, the three-dimensional macroscopic morphology of Typha leaves was characterized by micro computed tomography (Micro-CT) and its internal microstructure was observed by scanning electron microscopy (SEM). The combination of experimental and computational research was carried out in this paper, to reveal and verify the effect of multi-level structure on the mechanical properties...
October 12, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/29068039/respiratory-cardiovascular-and-metabolic-responses-during-different-modes-of-overground-bionic-ambulation-in-persons-with-motor-incomplete-spinal-cord-injury-a-case-series
#13
Jochen Kressler, Tracie Wymer, Antoinette Domingo
OBJECTIVE: To investigate the effects of overground bionic ambulation with variable assistance on cardiorespiratory and metabolic responses in persons with motor-incomplete spinal cord injury. DESIGN: Case series. SUBJECTS: Four participants with chronic, motor-incomplete spinal cord injury. METHODS: Subjects completed a maximal graded exercise test on an arm-ergometer and 3 6-min bouts of overground bionic ambulation using different modes of assistance, i...
October 25, 2017: Journal of Rehabilitation Medicine
https://www.readbyqxmd.com/read/29065731/optimising-the-effect-of-noise-reduction-algorithm-clearvoice-in-cochlear-implant-users-by-increasing-the-maximum-comfort-levels
#14
J Gertjan Dingemanse, André Goedegebure
OBJECTIVE: ClearVoice is a single-microphone noise reduction algorithm in Advanced Bionics cochlear implant(CI) systems with the aim to improve performance in background noise. The present study investigated a hypothesised increased effect of ClearVoice if combined with a structural increase of maximum comfort stimulation levels (M-levels) in the CI fitting. DESIGN: We tested performance with ClearVoice (Medium) in four conditions, defined by combined settings of ClearVoice off/on and with/without 5% increase of M-levels...
October 24, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/29060256/mechanical-properties-of-triply-periodic-minimal-surface-structures-mimicking-the-microstructure-of-woodpecker-s-cranial-bone
#15
Yikun Ni, Lizhen Wang, Yubo Fan
A new triply periodic minimal surface (TPMS) structure mimicking the microstructure of Great Spotted Woodpecker's cranial bone was designed, fabricated and tested in this study. It was found that the designed structures acquired better mechanical performance compared to the unit structures applied in heterogeneous porous scaffolds. The wall thickness mimicking the woodpecker's spongy bone and the TPMS surface structure were two contributors to the good mechanical performance of new designed bionic structures...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29039749/bionic-design-materials-and-performance-of-bone-tissue-scaffolds
#16
REVIEW
Tong Wu, Suihuai Yu, Dengkai Chen, Yanen Wang
Design, materials, and performance are important factors in the research of bone tissue scaffolds. This work briefly describes the bone scaffolds and their anatomic structure, as well as their biological and mechanical characteristics. Furthermore, we reviewed the characteristics of metal materials, inorganic materials, organic polymer materials, and composite materials. The importance of the bionic design in preoperative diagnosis models and customized bone scaffolds was also discussed, addressing both the bionic structure design (macro and micro structure) and the bionic performance design (mechanical performance and biological performance)...
October 17, 2017: Materials
https://www.readbyqxmd.com/read/28957201/anomalous-dispersion-engineering-of-co-sputtering-ag-azo-hybrids-for-antireflection-coatings
#17
Xianpeng Zhang, Yulei Yuan, Jing Zhang, Jinhua Huang, Xiaoxia You, Hua Xu, Yuehui Lu, Weijie Song
Conventional antireflection coatings (ARCs), including single- and multi-layer, bionic micro/nano, and gradient-index structures, often do not take anomalous dispersive materials into account, but normal dispersion and Rayleigh configuration, known as a step-down index profile, in which low refractive index (RI) materials are adjacent to incident media and the high RI ones, are located on substrates. We found that the anomalous dispersive materials could be good candidates for novel sub-100 nm ARCs, considering the ab-initio impedance matching designs...
August 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28890869/multifunctional-biomimetic-spinal-cord-new-approach-to-repair-spinal-cord-injuries
#18
REVIEW
Yang Liu, Qian Li, Bin Zhang, De-Xiang Ban, Shi-Qing Feng
The incidence of spinal cord injury (SCI) has been gradually increasing, and the treatment has troubled the medical field all the time. Primary and secondary injuries ultimately lead to nerve impulse conduction block. Microglia and astrocytes excessively accumulate and proliferate to form the glial scar. At present, to reduce the effect of glial scar on nerve regeneration is a hot spot in the research on the treatment of SCI. According to the preliminary experiments, we would like to provide a new bionic spinal cord to reduce the negative effect of glial scar on nerve regeneration...
August 20, 2017: World Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28884492/patterned-semiconductor-structures-modulate-neuronal-outgrowth-implication-for-the-development-of-a-neuro-bionic-interface
#19
Johannes Völker, Fabian Kohm, Lukas Jürgens, Agmal Scherzad, Philipp Schendzielorz, Sebastian Schraven, Robert Mlynski, Andreas Radeloff, Rudolf Hagen, Kristen Rak
Auditory implants stimulate the neurons by broad electrical fields, which leads to a low number of spectral channels. A reduction in the distance between the electrode and the neuronal structures might lead to better electrical transduction. The use of microstructured semiconductors offers a large number of contacts, which could attract neurons and stimulate them individually. To investigate the interaction between neurons and semiconductors, differentiated neuronal precursor cells were cultured on silicon wafers...
September 7, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28880183/gaussian-process-autoregression-for-simultaneous-proportional-multi-modal-prosthetic-control-with-natural-hand-kinematics
#20
Michele Xiloyannis, Constantinos Gavriel, Andreas A C Thomik, A Aldo Faisal
Matching the dexterity, versatility and robustness of the human hand is still an unachieved goal in bionics, robotics and neural engineering. A major limitation for hand prosthetics lies in the challenges of reliably decoding user intention from muscle signals when controlling complex robotic hands. Most of the commercially available prosthetic hands use musclerelated signals to decode a finite number of predefined motions and some offer proportional control of open/close movements of the whole hand. Here, in contrast, we aim to offer users flexible control of individual joints of their artificial hand...
August 31, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
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