All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected ...of a proceedings journal published by IOP Publishing Publishing.• Type of peer review: Double Anonymous• Conference submission management system: Morressier• Number of submissions received: 26• Number of submissions sent for review: 24• Number of submissions accepted: 20• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 76.9• Average number of reviews per paper: 2• Total number of reviewers involved: 20• Contact person for queries:Name: Manuela-Roxana DijmarescuEmail: manuela.dijmarescu@upb.roAffiliation: Polytechnic University of Bucharest - Manufacturing Engineering
The 6th International Scientific Conference: NEWTECH 2020 – Advanced Manufacturing Engineering and Technologies was organized by Dunarea de Jos University of Galati, Romania. It was held between ...9th-11th of September 2020 in Galati, Romania and was supported by the The Executive Unit for Financing Higher Education, Research, Development and Innovation (UEFISCDI). The Conference: NEWTECH 2020 – Advanced Manufacturing Engineering and Technologies has a tradition of over 10 years, the inaugural edition having been organized in 2009 by the Dunarea de Jos University of Galati. This was followed by the 2011 edition in Brno, Czech Republic; 2013 at the KHT Institute of Technology, Stockholm; 2015 at Wroclaw University of Technology and 2017 at the University of Belgrade. Editors NEWTECH 2020, Conference Committees are available in the pdf.
4D printing refers to single-material or multi-material printing of a device or object that can be transformed from a 1D strand into pre-programed 3D shape, from a 2D surface into preprogramed 3D ...shape and is capable of morphing between different dimensions. Such transformations are facilitated by, e.g., heating, light, or swelling in a liquid, electrochemically and by programming different sensitivity to, e.g., swelling into various parts of the designed geometry. These techniques offer adaptability and dynamic response for structures and systems of all sizes, and promises new possibilities for embedding programmability and simple decision making into non-electronic based materials. Potential applications include; robotics-like behavior without the reliance on complex electro-mechanical-chemical devices as well as adaptive products, garments or mechanisms that respond to user-demands and fluctuating environments. In this paper, we have discussed fundamentals and laws governing 4D printing, materials that are employed in 4D printing along with applications such as soft robotics and challenges that need to be overcome for 4D printing to evolve as a mainstream manufacturing technology.
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•Developments and the applications of 4D printing are reviewed.•4D printed techniques are discussed thoroughly.•Advances, challenges and future scope are also discussed.
Light detection is the underlying principle of many optoelectronic systems. For decades, semiconductors including silicon carbide, silicon, indium gallium arsenide and germanium have dominated the ...photodetector industry. They can show excellent photosensitivity but are limited by one or more aspects, such as high production cost, high-temperature processing, flexible substrate incompatibility, limited spectral range or a requirement for cryogenic cooling for efficient operation. Recently lead sulphide (PbS) nanocrystals have emerged as one of the most promising new materials for photodetector fabrication. They offer several advantages including low-cost manufacturing, solution processability, size-tunable spectral sensitivity and flexible substrate compatibility, and they have achieved figures of merit outperforming conventional photodetectors. We review the underlying concepts, breakthroughs and remaining challenges in photodetector technologies based on PbS nanocrystals.
All children need the time, place, and opportunity for play, regardless of who they are or where they live. This fundamental need is embodied in the United Nations Convention on the Rights of the ...Child. This paper addresses the interpretation of the child’s right to play in the case of children who are sick or in need of hospital or community healthcare. Over the course of the past 150 years, the care of sick children has evolved to the point where play is recognized as a key element of pediatric provision in many nations of the world; the ‘hospital play’ profession has grown from its tentative introduction in the UK in the 1950s to become part of a worldwide movement for the child’s right to play. Written in collaboration with Japan Hospital Play Association, which marks fifteen years of hospital play in Japan, this paper celebrates the importance of understanding the history of the past in order to make meaning of the history of the now.
Soliton microcomb range measurement Suh, Myoung-Gyun; Vahala, Kerry J
Science (American Association for the Advancement of Science),
02/2018, Letnik:
359, Številka:
6378
Journal Article
Recenzirano
Odprti dostop
Laser-based range measurement systems are important in many application areas, including autonomous vehicles, robotics, manufacturing, formation flying of satellites, and basic science. Coherent ...laser ranging systems using dual-frequency combs provide an unprecedented combination of long range, high precision, and fast update rate. We report dual-comb distance measurement using chip-based soliton microcombs. A single pump laser was used to generate dual-frequency combs within a single microresonator as counterpropagating solitons. We demonstrated time-of-flight measurement with 200-nanometer precision at an averaging time of 500 milliseconds within a range ambiguity of 16 millimeters. Measurements at distances up to 25 meters with much lower precision were also performed. Our chip-based source is an important step toward miniature dual-comb laser ranging systems that are suitable for photonic integration.
Thin, sensitive skin electronics
The properties of the human sense of touch, including high sensitivity to differences in temperature, pressure, or surface roughness, are challenging to replicate in ...robotics because skin materials must be highly conductive, stretchable, and thin. Jung
et al
. developed a process to assemble nanomaterials as a monolayer that is partially embedded in an ultrathin elastomer. The process works by depositing a mixed solvent containing nanostructured silver and/or gold, along with elastomer, onto deionized water. This results in a layer of nanoparticles residing at the interface coating with elastomer, which is further densified by the addition of surfactant. The process is scalable, and the resulting elastomer membranes can be transferred to other substrates. —MSL
A float assembly method enables fabrication of highly conductive, stretchable, and ultrathin nanomembranes.
Skin electronics require stretchable conductors that satisfy metallike conductivity, high stretchability, ultrathin thickness, and facile patternability, but achieving these characteristics simultaneously is challenging. We present a float assembly method to fabricate a nanomembrane that meets all these requirements. The method enables a compact assembly of nanomaterials at the water–oil interface and their partial embedment in an ultrathin elastomer membrane, which can distribute the applied strain in the elastomer membrane and thus lead to a high elasticity even with the high loading of the nanomaterials. Furthermore, the structure allows cold welding and bilayer stacking, resulting in high conductivity. These properties are preserved even after high-resolution patterning by using photolithography. A multifunctional epidermal sensor array can be fabricated with the patterned nanomembranes.
Shape-morphing finds widespread utility, from the deployment of small stents and large solar sails to actuation and propulsion in soft robotics. Origami structures provide a template for ...shape-morphing, but rules for designing and folding the structures are challenging to integrate into broad and versatile design tools. Here, we develop a sequential two-stage optimization framework to approximate a general surface by a deployable origami structure. The optimization is performed over the space of all possible rigidly and flat-foldable quadrilateral mesh origami. So, the origami structures produced by our framework come with desirable engineering properties: they can be easily manufactured on a flat reference sheet, deployed to their target state by a controlled folding motion, then to a compact folded state in applications involving storage and portability. The attainable surfaces demonstrated include those with modest but diverse curvatures and unprecedented ones with sharp ridges. The framework provides not only a tool to design various deployable and retractable surfaces in engineering and architecture, but also a route to optimizing other properties and functionality.
•An inverse design framework to approximate surfaces by deployable origami.•Easy manufacture and controlled deployment for origami.•Wide adaptation to demands for programming functionality using origami.
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