Here we explore the use of scanning electron diffraction (also known as 4D-STEM) coupled with electron atomic pair distribution function analysis (ePDF) to understand the local order (structure and chemistry) as a fun...
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In the previous work, the authors have proposed a design of a magnetic levitated vertical axis wind turbine (VAWT) for power generation purposes by using two permanent magnets attractive type passive magnetic bearings...
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ISBN:
(纸本)9781728102634
In the previous work, the authors have proposed a design of a magnetic levitated vertical axis wind turbine (VAWT) for power generation purposes by using two permanent magnets attractive type passive magnetic bearings where the rotor was actively controlled in one degree of freedom (DOF) in the axial direction. The proposed model is simpler than the other VAWT designs and has low cost; however, the radial stiffness is not high enough to rotate the rotor at high speeds. Therefore, this paper discusses the stiffness analysis of different rotor shapes which can be used in VAWT by three-dimensional (3-D) magnetic-field analysis. The simulation results will be compared with the experimental results to evaluate which rotor shape is suitable for stable levitation and rotation at the different wind speeds.
The prediction of short-term building electric loads is the essential basis for many building energy management tasks, such as detection and diagnosis of faults, demand-side management, and optimization of control sys...
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Collaborative perception has attracted growing interest from academia and industry due to its potential to enhance perception accuracy, safety, and robustness in autonomous driving through multi-agent information fusi...
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Bi_2Se_3 was studied as a novel sodium-ion battery anode material because of its high theoretical capacity and high intrinsic conductivity. Integrated with carbon,Bi_2Se_3/C composite shows excellent cyclic performanc...
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Bi_2Se_3 was studied as a novel sodium-ion battery anode material because of its high theoretical capacity and high intrinsic conductivity. Integrated with carbon,Bi_2Se_3/C composite shows excellent cyclic performance and rate capability. For instance, the Bi_2Se_3/C anode delivers an initial capacity of 527 mAh g^(-10) at 0.1 A g^(-1) and maintains 89% of this capacity over 100 cycles. The phase change and sodium storage mechanism are also carefully investigated.
The COVID-19 pandemic left an unprecedented impact on the general public health, resulting in thousands of deaths in the US alone. Nationwide testing plans were initiated to control the spread, with drive-through bein...
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Fatigue life estimation of Ti-6Al-4V parts produced by additive manufacturing (AM) technologies has received increasing interest during the last decade. Recent studies focused mostly on the fatigue performance of Ti-6...
Fatigue life estimation of Ti-6Al-4V parts produced by additive manufacturing (AM) technologies has received increasing interest during the last decade. Recent studies focused mostly on the fatigue performance of Ti-6Al-4V considering a fixed stress ratio ( R ), usually 0.1 or −1. However, in order to properly design structural components subjected to variable loads, the effect of different stress ratios on the fatigue performance has to be carefully investigated. This research studies the stress ratio influence on the fatigue properties of Ti-6Al-4V specimens produced by laser powder bed fusion (L-PBF). Miniaturized Ti-6Al-4V samples were tested with the step procedure for different R values. A constant life Haigh's diagram (2 · 10 6 cycles) was generated for L-PBF Ti-6Al-4V in as-built, electro-polished, and machined surface condition. The results present for the first time the relations between alternating and mean stresses for L-PBF Ti-6Al-4V with a fine α + β microstructure when different surface posttreatments are used to enhance the coupons’ final surface quality.
Sensory feedback is highly desirable in upper limb prostheses as well as in human robot interaction and other human machine interfaces. Bone conduction as sensory feedback interface is a recently studied approach show...
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ISBN:
(数字)9781728159072
ISBN:
(纸本)9781728159089
Sensory feedback is highly desirable in upper limb prostheses as well as in human robot interaction and other human machine interfaces. Bone conduction as sensory feedback interface is a recently studied approach showing promising properties. A combination of different feedback information is often necessary for prosthetic grasping, thus multiple feedback channels are required for effective sensory feedback. The use of multiple bone conduction stimulation sites simultaneously has not yet been studied. In this paper, the psychometric evaluation of multiple stimulation sites on the physiologically given bony landmarks on the elbow is investigated. The proposed approach is evaluated on human-subject experiments with six able-bodied subjects and one subject with transradial amputation. Vibrotactile transducers are placed on the bony landmarks of the elbow to determine the identification rate of each stimulation point separately as well as the identification rate of the number of active stimulation points for different frequencies. The outcomes show high identification rates for a frequency range from 100 to 750 Hz whilst performance deteriorates to at chance level at higher frequencies. A decreasing performance in identifying the number of active stimulation sites for an increasing number of simultaneous active transducers was observed. The obtained good performance in location identification suggests that information can be encoded via the location of the stimulation.
Repairing massive rotator cuff tendon defects remains a challenge due to the high retear rate after surgical intervention.3D printing has emerged as a promising technique that enables the fabrication of engineered tis...
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Repairing massive rotator cuff tendon defects remains a challenge due to the high retear rate after surgical intervention.3D printing has emerged as a promising technique that enables the fabrication of engineered tissues with heterogeneous structures and mechanical properties,as well as controllable microenvironments for tendon *** this study,we developed a new strategy for rotator cuff tendon repair by combining a 3D printed scaffold of polylactic-co-glycolic acid(PLGA)with cell-laden collagen-fibrin *** designed and fabricated two types of scaffolds:one featuring a separate layer-by-layer structure and another with a tri-layered structure as a *** tensile tests showed that both types of scaffolds had improved mechanical properties compared to single-layered PLGA *** printed scaffold with collagen-fibrin hydrogels effectively supported the growth,proliferation,and tenogenic differentiation of human adipose-derived mesenchymal stem *** implantation of the multilayered scaffolds demonstrated their excellent in vivo *** study demonstrates the feasibility of 3D printing multilayered scaffolds for application in rotator cuff tendon regeneration.
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