AI Article Synopsis
- Shape memory polymers (SMPs) can change their shape when heated, and this study focused on 3D printing SMP-based polyurethane to create complex parts for advanced applications.
- The printed actuating structures demonstrated effective memory performance, fully returning to their original form after thermal activation, and included unique QR codes to combat counterfeiting.
- Additionally, the integration of shape memory alloys with these SMPs produced a smart actuator that functions as a two-way switch for controlling microcontroller data collection.
Article Abstract
Shape memory polymers (SMPs) are materials capable of changing their structural configuration from a fixed shape to a temporary shape, and vice versa when subjected to a thermal stimulus. The present work has investigated the 3D printing process of a shape memory polymer (SMP)-based polyurethane using a material extrusion technology. Here, SMP pellets were fed into a printing unit, and actuating coupons were manufactured. In contrast to the conventional film-casting manufacturing processes of SMPs, the use of 3D printing allows the production of complex parts for smart electronics and morphing structures. In the present work, the memory performance of the actuating structure was investigated, and their fundamental recovery and mechanical properties were characterized. The preliminary results show that the assembled structures were able to recover their original conformation following a thermal input. The printed parts were also stamped with a QR code on the surface to include an unclonable pattern for addressing counterfeit features. The stamped coupons were subjected to a deformation-recovery shape process, and it was observed that the QR code was recognized after the parts returned to their original shape. The combination of shape memory effect with authentication features allows for a new dimension of counterfeit thwarting. The 3D-printed SMP parts in this work were also combined with shape memory alloys to create a smart actuator to act as a two-way switch to control data collection of a microcontroller.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7829936 | PMC |
| http://dx.doi.org/10.3390/mi12010087 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Oppositional and competitive instigation of hippocampal synaptic plasticity by the VTA and locus coeruleus.
Proc Natl Acad Sci U S A
January 2025
Department of Neurophysiology, Medical Faculty, Ruhr University Bochum, Bochum 44780, Germany.
The novelty, saliency, and valency of ongoing experiences potently influence the firing rate of the ventral tegmental area (VTA) and the locus coeruleus (LC). Associative experience, in turn, is recorded into memory by means of hippocampal synaptic plasticity that is regulated by noradrenaline sourced from the LC, and dopamine, sourced from both the VTA and LC. Two persistent forms of synaptic plasticity, long-term potentiation (LTP), and long-term depression (LTD) support the encoding of different kinds of spatial experience.
View Article and Find Full Text PDFWorking memory (WM) is an evolving concept. Our understanding of the neural functions that support WM develops iteratively alongside the approaches used to study it, and both can be profoundly shaped by available tools and prevailing theoretical paradigms. Here, the organizers of the 2024 Working Memory Symposium-inspired by this year's meeting-highlight current trends and looming questions in WM research.
View Article and Find Full Text PDFPsychological Distress and Problems Among Young and Middle-Aged Cancer Patients Undergoing Treatment in China.
Psychooncology
January 2025
Department of Nursing, Shanghai Proton and Heavy Ion Center, Fudan University Cancer Hospital, Shanghai, China.
Objective: Influenced by their life stage and socio-cultural background, young and middle-aged cancer patients in China may experience unique psychological distress. Therefore, this study investigated the severity, problems, and associated factors of psychological distress among young and middle-aged cancer patients.
Methods: We conducted a cross-sectional study on young and middle-aged cancer patients aged 18-59 who were treated at a radiotherapy center from February 2022 to September 2023.
Policy complexity suppresses dopamine responses.
J Neurosci
January 2025
Department of Physiology, Anatomy and Genetics, University of Oxford.
Limits on information processing capacity impose limits on task performance. We show that male and female mice achieve performance on a perceptual decision task that is near-optimal given their capacity limits, as measured by policy complexity (the mutual information between states and actions). This behavioral profile could be achieved by reinforcement learning with a penalty on high complexity policies, realized through modulation of dopaminergic learning signals.
View Article and Find Full Text PDFMemory load influences our preparedness to act on visual representations in working memory without affecting their accessibility.
Prog Neurobiol
January 2025
Institute for Brain and Behavior Amsterdam, Department of Experimental and Applied Psychology, Vrije Universiteit Amsterdam, the Netherlands. Electronic address:
It is well established that when we hold more content in working memory, we are slower to act upon part of that content when it becomes relevant for behavior. Here, we asked whether this load-related slowing is due to slower access to the sensory representations held in working memory (as predicted by serial working-memory search), or by a reduced preparedness to act upon those sensory representations once accessed. To address this, we designed a visual-motor working-memory task in which participants memorized the orientation of two or four colored bars, of which one was cued for reproduction.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!