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"Repairing"
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Application of Directed Energy Deposition-Based Additive Manufacturing in Repair
In the circular economy, products, components, and materials are aimed to be kept at the utility and value all the lifetime. For this purpose, repair and remanufacturing are highly considered as proper techniques to return the value of the product during its life. Directed Energy Deposition (DED) is a very flexible type of additive manufacturing (AM), and among the AM techniques, it is most suitable for repairing and remanufacturing automotive and aerospace components. Its application allows damaged component to be repaired, and material lost in service to be replaced to restore the part to its original shape. In the past, tungsten inert gas welding was used as the main repair method. However, its heat affected zone is larger, and the quality is inferior. In comparison with the conventional welding processes, repair via DED has more advantages, including lower heat input, warpage and distortion, higher cooling rate, lower dilution rate, excellent metallurgical bonding between the deposited layers, high precision, and suitability for full automation. Hence, the proposed repairing method based on DED appears to be a capable method of repairing. Therefore, the focus of this study was to present an overview of the DED process and its role in the repairing of metallic components. The outcomes of this study confirm the significant capability of DED process as a repair and remanufacturing technology.
Journal Article
The clock repairer's handbook
\"A how-to guide to diagnosing and correcting faults in clocks, antique and modern.\" -- Cover, p. [4].
BOOK
Image Inpainting: A Review
Although image inpainting, or the art of repairing the old and deteriorated images, has been around for many years, it has recently gained even more popularity, because of the recent development in image processing techniques. With the improvement of image processing tools and the flexibility of digital image editing, automatic image inpainting has found important applications in computer vision and has also become an important and challenging topic of research in image processing. This paper reviews the existing image inpainting approaches, that were classified into three subcategories, sequential-based, CNN-based, and GAN-based methods. In addition, for each category, a list of methods for different types of distortion on images are presented. Furthermore, the paper also presents available datasets. Last but not least, we present the results of real evaluations of the three categories of image inpainting methods performed on the used datasets, for different types of image distortion. We also present the evaluations metrics and discuss the performance of these methods in terms of these metrics. This overview can be used as a reference for image inpainting researchers, and it can also facilitate the comparison of the methods as well as the datasets used. The main contribution of this paper is the presentation of the three categories of image inpainting methods along with a list of available datasets that the researchers can use to evaluate their proposed methodology against.
Journal Article
Small things mended
\"Friendship and purpose help a grieving man re-engage with his world and talent for fixing things\"-- Provided by publisher.
BOOK
A shape memory scaffold for body temperature self‐repairing wearable perovskite solar cells with efficiency exceeding 21
Grain boundary cracks in flexible perovskite films can be repaired by filling with self‐repairing polymers during the preparation and wearable operation. However, the self‐repairing polymers are commonly active through external heating or humidification treatments, which cannot match with the human body's temperature tolerance of wearable devices. Herein, a body temperature‐responsive shape memory polyurethane (SMPU) is demonstrated to achieve the real‐time mechanical self‐repairing of grain boundary cracks (~37°C). Furthermore, the strong intermolecular interaction between SMPU and the uncoordinated Pb2+ and I−, can reduce the trap density in perovskite films. The blade‐coated device achieves a power conversion efficiency (PCE) of 21.33%, which is among the best reported flexible perovskite solar cells (PSCs; 0.10 cm2). Importantly, the device with SMPU can recover more than 80% of the PCE after 6000 cycles (bending radius: 8 mm). Finally, the flexible PSCs are used for wearable solar power supply of a smartphone, which show great potential for self‐repairing wearable electronics. A body temperature‐responsive shape memory polyurethane (SMPU), with the strong hydrogen bonding force and shape memory effect, is demonstrated to achieve the self‐repairing of grain boundaries cracks (~37°C, recover 91% of the power conversion efficiency [PCE]). Accordingly, the blade‐coated flexible perovskite solar cell (PSC) with SMPU achieves a record PCE of 21.33% and can be used as the power supply for a smartphone.
Journal Article
Mix-free, rapid-infiltration, and quick-setting road repair material based on MPC
A new kind of mix-free, rapid-infiltration, and quick-setting road repair material based on MPC is prepared and experimentally studied. Compared to traditional road repair methods that rely on construction machinery and mixing equipment, these new types of materials can be directly poured into craters filled with coarse aggregates without any mixing. They can infiltrate under gravity and rapidly harden, thus achieving the desired road repair effects. To modify these materials, the optimal gradation and void ratio of coarse aggregates were first determined using the PSO method. Then, the properties of MPC were optimized to achieve good overall performance. Experimental results testify to an optimal coarse aggregate gradation, meanwhile demonstrating the enhanced effects of sodium silicate on the fluidity and strength of MPC. Besides, layered filling can effectively improve emergency repair efficiency. The 4-hour compressive strength of MPC reaches 7.5 MPa.
Journal Article
Furniture flips : 25 bright and vibrant painted furniture projects
\"Joanne Condon takes you step-by-step through the process of furniture flipping, from choosing the right piece to using color, pattern and detail to bring new life to an item.\"--Amazon.com.
BOOK
Self‐Warning and Self‐Repairing Mechanisms in Functional Coatings: A Review
Coatings have attracted widespread attention in the field of corrosion protection of metals because of their corrosion resistance and convenient techniques. Unfortunately, till now, traditional coatings have the shortcomings of vulnerability and passive corrosion protection, hence functional coatings progressively replace them. Endowing coatings with additional functions not only transform them into active protection mechanisms but also significantly improve life cycle of coatings. However, there is only limited success in combining multiple functions of coatings, which poses considerable obstacles to further advancement of their application researches. In this paper, we summarize the research progress of self‐warning and self‐repairing coatings in the field of metal corrosion protection as much as possible from the perspective of functional material selection. Meanwhile, the current progress of substituting dual‐functional coatings for single‐functional coatings is also highlighted. We aim to provide more options and strategic guidance for the design and fabrication of functional coatings on metal surfaces and to explore the possibilities of these designs in practical applications. Last but not least, the remaining challenges and future growth regarding this field are also outlined at the end. It is hope that such an elaborately organized review will benefit the readers interested to foster more possibilities in the future. In this paper, we summarize the research progress of self‐warning and self‐repairing coatings in the field of metal corrosion protection as much as possible from the perspective of functional material selection. Meanwhile, the current progress of substituting dual‐functional coatings for single‐functional coatings is also highlighted.
Journal Article