Prosthetic hands are developed to replace lost hands. However, it has been hard to ensure the same level grasping and manipulating objects as human hands and the cosmetic appearance is also important. In a previous wo...
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ISBN:
(数字)9781728119908
ISBN:
(纸本)9781728119915
Prosthetic hands are developed to replace lost hands. However, it has been hard to ensure the same level grasping and manipulating objects as human hands and the cosmetic appearance is also important. In a previous work, Rehand II: an electric and cosmetic prosthetic hand was developed. Its function is limited to simple object grasping, but it has the cosmetic appearance and is relatively light. This paper aimed to improve Rehand II by introducing tactile sense. Tactile sense is available to detect physical contact, recognize physical attributes of objects such as their softness and texture, and ensure delicate operation while handling the objects. Additionally, tactile sense is relevant to build the body recognition. We focused on vibrotactile sense from the aspects of a wide receptive field, contribution to contact detection and various frequency information involved. A simple electric and cosmetic prosthetic hand with vibrotactile sense was developed by improving Rehand II with polyvinylidene difluoride film sensors for detecting skin-propagated vibrations and soft vibrators for the feedback. The sensors were embedded at the thumb, index finger, and back of the hand of the prosthetic hand. First, recognition tests involving tapped part were conducted. Then, recognition and realistic rating tests involving operations were conducted. Results showed high recognition of tapped parts and operations and the good realistic.
Driven by rapid advancements in smart wearable technologies and perovskite photovoltaics, flexible perovskite solar cells (FPSCs) have emerged as highly promising autonomous power sources, poised to transform the next...
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Driven by rapid advancements in smart wearable technologies and perovskite photovoltaics, flexible perovskite solar cells (FPSCs) have emerged as highly promising autonomous power sources, poised to transform the next generation of mobile energy systems, portable electronics, and integrated wearable devices. For successful deployment in real-world scenarios, FPSCs must exhibit a combination of key attributes, including high power conversion efficiency (PCE), lightweight architecture, environmental robustness, and mechanical adaptability—encompassing flexibility, stretchability, and twistability. This review provides a detailed examination of the evolution, current state, and practical deployment of FPSCs, emphasizing their potential as efficient, portable energy solutions. It investigates advanced strategies for improving environmental resilience and mechanical recoverability, including the engineering of flexible substrates, deposition of high-quality perovskite films, and optimization of charge-selective interfaces. Additionally, it offers a systematic analysis of device design, fabrication protocols, scalable printing techniques, and standardized performance evaluation methods tailored for wearable FPSCs. Recent progress in enhancing the optoelectronic properties and mechanical durability of FPSCs is also critically reviewed. Ultimately, this work delivers a comprehensive perspective on FPSCs from both optoelectronic and mechanical viewpoints, identifies key challenges, and outlines future research pathways toward the seamless integration of FPSCs into multifunctional, next-generation wearable systems.
This paper discusses a postprocessor for milling robots connected to additional linear machine axes where toolpath is optimized with respect to variable properties of the robot in its workspace. A toolpath optimizatio...
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This paper discusses a postprocessor for milling robots connected to additional linear machine axes where toolpath is optimized with respect to variable properties of the robot in its workspace. A toolpath optimization method is proposed based on an experimentally verifiedrobot stiffness model. After postprocessor distribution of the movements between the robot and the linear axes, the collision states during machiningcannot be verified in common CAM. Therefore, a solution enabling simulation of movements after optimization is proposed. The tool center point coordinates are used to control the robot and additional machine axes, while the joint coordinates calculated by inverse kinematic transformation are used to verify the movements.
Objectives: This study proposes a computational model to evaluate patient room design layout and features that contribute to patient stability and mitigate the risk of fall. Background: While common fall risk assessme...
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The three elements essential for life are sunshine, air, and water. This is an undeniable fact, but with advancements in technology, amenities such as electricity, smart phones, and the internet have become the urban ...
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In this work, the Na–K liquid alloy with a charge selective interfacial layer is developed to achieve an impressively long cycling life with small overpotential on a sodium super-ionic conductor solid-state electroly...
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In this work, the Na–K liquid alloy with a charge selective interfacial layer is developed to achieve an impressively long cycling life with small overpotential on a sodium super-ionic conductor solid-state electrolyte (NASICON SSE). With this unique multi-cation system as the platform, we further propose a unique model that contains a chemical decomposition domain and a kinetic decomposition domain for the interfacial stability model. Based on this model, two charge selection mechanisms are proposed with dynamic chemical kinetic equilibrium and electrochemical kinetics as the manners of control, respectively, and both are validated by the electrochemical measurements with microscopic and spectroscopic characterizations. This study provides an effective design for high-energy-density solid-state battery with alkali Na–K anode, but also presents a novel approach to understand the interfacial chemical processes that could inspire and guide future designs.
For equipment that operates in high-speed abrasive media, erosion will be the major factor for its failure. Metal Matrix Composite (MMC) Aluminum-Silicon Carbide has been developed for improving the lifetime for such ...
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We report in-situ measurements of the elastic modulus of dense polycrystalline zirconia held in a constant state of flash, i.e. during Stage III of flash experiments. The modulus, measured with and without flash, is l...
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Electronic conduction in solid-polymer electrolytes is generally not desired, which causes leakage of electrons or energy loss, and the electronically conductive domains at electrode-electrolyte interfaces can lead to...
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Electronic conduction in solid-polymer electrolytes is generally not desired, which causes leakage of electrons or energy loss, and the electronically conductive domains at electrode-electrolyte interfaces can lead to continuous decomposition of electrolytes and shorting issues. However, it is noticed in this work that in an insulating matrix, the conductive domains at certain aspects could also have positive effects on the electrolyte performance with proper control. This work evaluates the limitation and benefits of electronically conductive domains in a solid-polymer electrolyte system and discusses the approach to improve the electrolyte physicochemical properties with densified local electric field distribution, enhanced bulk dielectric property, and charge transfer. By deliberately introducing the conductive domains in a regular solid-polymer electrolyte, stable cycle life, low overpotential, and promising full cell performance could be achieved.
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