̽��ֱ�� of Cambridge - Nanyang Technological ̽��ֱ��

Taking Cambridge global

skbf2 — Fri, 01 Dec 2023 11:54:25 +0000

In 2013, Cambridge opened its first-ever overseas research centre, the Cambridge Centre for Advanced Research and Education in Singapore (CARES). Over the past decade, CARES has grown into a thriving community of 150 staff and researchers, working with partners to achieve scientific breakthroughs with a global impact.

Using lasers to ‘heat and beat’ 3D-printed steel could help reduce costs

sc604 — Mon, 30 Oct 2023 09:01:39 +0000

̽��ֱ��method, developed by a research team led by the ̽��ֱ�� of Cambridge, allows structural modifications to be ‘programmed’ into metal alloys during 3D printing, fine-tuning their properties without the ‘heating and beating’ process that’s been in use for thousands of years.

̽��ֱ��new 3D printing method combines the best qualities of both worlds: the complex shapes that 3D printing makes possible, and the ability to engineer the structure and properties of metals that traditional methods allow. ̽��ֱ��results are reported in the journal Nature Communications.

3D printing has several advantages over other manufacturing methods. For example, it’s far easier to produce intricate shapes using 3D printing, and it uses far less material than traditional metal manufacturing methods, making it a more efficient process. However, it also has significant drawbacks.

“There’s a lot of promise around 3D printing, but it’s still not in wide use in industry, mostly because of high production costs,” said Dr Matteo Seita from Cambridge’s Department of Engineering, who led the research. “One of the main drivers of these costs is the amount of tweaking that materials need after production.”

Since the Bronze Age, metal parts have been made through a process of heating and beating. This approach, where the material is hardened with a hammer and softened by fire, allows the maker to form the metal into the desired shape and at the same time impart physical properties such as flexibility or strength.

“ ̽��ֱ��reason why heating and beating is so effective is because it changes the internal structure of the material, allowing control over its properties,” said Seita. “That’s why it’s still in use after thousands of years.”

One of the major downsides of current 3D printing techniques is an inability to control the internal structure in the same way, which is why so much post-production alteration is required. “We’re trying to come up with ways to restore some of that structural engineering capability without the need for heating and beating, which would in turn help reduce costs,” said Seita. “If you can control the properties you want in metals, you can leverage the greener aspects of 3D printing.”

Working with colleagues in Singapore, Switzerland, Finland and Australia, Seita developed a new ‘recipe’ for 3D-printed metal that allows a high degree of control over the internal structure of the material as it is being melted by a laser.

By controlling the way that the material solidifies after melting, and the amount of heat that is generated during the process, the researchers can programme the properties of the end material. Normally, metals are designed to be strong and tough, so that they are safe to use in structural applications. 3D-printed metals are inherently strong, but also brittle.

̽��ֱ��strategy the researchers developed gives full control over both strength and toughness, by triggering a controlled reconfiguration of the microstructure when the 3D-printed metal part is placed in a furnace at relatively low temperature. Their method uses conventional laser-based 3D printing technologies, but with a small tweak to the process.

“We found that the laser can be used as a ‘microscopic hammer’ to harden the metal during 3D printing,” said Seita. “However, melting the metal a second time with the same laser relaxes the metal’s structure, allowing the structural reconfiguration to take place when the part is placed in the furnace.”

Their 3D printed steel, which was designed theoretically and validated experimentally, was made with alternating regions of strong and tough material, making its performance comparable to steel that’s been made through heating and beating.

“We think this method could help reduce the costs of metal 3D printing, which could in turn improve the sustainability of the metal manufacturing industry,” said Seita. “In the near future, we also hope to be able to bypass the low-temperature treatment in the furnace, further reducing the number of steps required before using 3D printed parts in engineering applications.”

̽��ֱ��team included researchers from Nanyang Technological ̽��ֱ��, the Agency for Science, Technology and Research (A*STAR), the Paul Scherrer Institute, VTT Technical Research Centre of Finland, and the Australian Nuclear Science & Technology Organisation. Matteo Seita is a Fellow of St John’s College, Cambridge.

Reference:
Shubo Gao et al. ‘Additive manufacturing of alloys with programmable microstructure and properties.’ Nature Communications (2023). DOI: 10.1038/s41467-023-42326-y

Researchers have developed a new method for 3D printing metal that could help reduce costs and make more efficient use of resources.

This method could help reduce the costs of metal 3D printing, which could in turn improve the sustainability of the metal manufacturing industry

Matteo Seita

Jude E. Fronda

Retrieval of a stainless steel part made by 3D printing

̽��ֱ��text in this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Images, including our videos, are Copyright © ̽��ֱ�� of Cambridge and licensors/contributors as identified. All rights reserved. We make our image and video content available in a number of ways – as here, on our main website under its Terms and conditions, and on a range of channels including social media that permit your use and sharing of our content under their respective Terms.

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Earth's interior is swallowing up more carbon than thought

cmm201 — Mon, 26 Jul 2021 09:59:43 +0000

They found that the carbon drawn into Earth’s interior at subduction zones - where tectonic plates collide and dive into Earth’s interior - tends to stay locked away at depth, rather than resurfacing in the form of volcanic emissions.

Their findings, published in Nature Communications, suggest that only about a third of the carbon recycled beneath volcanic chains returns to the surface via recycling, in contrast to previous theories that what goes down mostly comes back up.

One of the solutions to tackle climate change is to find ways to reduce the amount of CO₂ in Earth’s atmosphere. By studying how carbon behaves in the deep Earth, which houses the majority of our planet’s carbon, scientists can better understand the entire lifecycle of carbon on Earth, and how it flows between the atmosphere, oceans and life at the surface.

̽��ֱ��best-understood parts of the carbon cycle are at or near Earth’s surface, but deep carbon stores play a key role in maintaining the habitability of our planet by regulating atmospheric CO₂ levels. “We currently have a relatively good understanding of the surface reservoirs of carbon and the fluxes between them, but know much less about Earth’s interior carbon stores, which cycle carbon over millions of years,” said lead author Stefan Farsang, who conducted the research while a PhD student at Cambridge's Department of Earth Sciences.

There are a number of ways for carbon to be released back to the atmosphere (as CO₂) but there is only one path in which it can return to the Earth’s interior: via plate subduction. Here, surface carbon, for instance in the form of seashells and micro-organisms which have locked atmospheric CO₂ into their shells, is channelled into Earth’s interior. Scientists had thought that much of this carbon was then returned to the atmosphere as CO₂ via emissions from volcanoes. But the new study reveals that chemical reactions taking place in rocks swallowed up at subduction zones trap carbon and send it deeper into Earth’s interior - stopping some of it coming back to Earth’s surface.

̽��ֱ��team conducted a series of experiments at the European Synchrotron Radiation Facility, “ ̽��ֱ��ESRF has world-leading facilities and the expertise that we needed to get our results,” said co-author Simon Redfern, Dean of the College of Science at NTU Singapore, “ ̽��ֱ��facility can measure very low concentrations of these metals at the high pressure and temperature conditions of interest to us.” To replicate the high pressures and temperatures of subductions zones, they used a heated ‘diamond anvil’, in which extreme pressures are achieved by pressing two tiny diamond anvils against the sample.

̽��ֱ��work supports growing evidence that carbonate rocks, which have the same chemical makeup as chalk, become less calcium-rich and more magnesium-rich when channelled deeper into the mantle. This chemical transformation makes carbonate less soluble – meaning it doesn’t get drawn into the fluids that supply volcanoes. Instead, the majority of the carbonate sinks deeper into the mantle where it may eventually become diamond.

“There is still a lot of research to be done in this field,” said Farsang. “In the future, we aim to refine our estimates by studying carbonate solubility in a wider temperature, pressure range and in several fluid compositions.”

̽��ֱ��findings are also important for understanding the role of carbonate formation in our climate system more generally. “Our results show that these minerals are very stable and can certainly lock up CO₂ from the atmosphere into solid mineral forms that could result in negative emissions,” said Redfern. ̽��ֱ��team have been looking into the use of similar methods for carbon capture, which moves atmospheric CO₂ into storage in rocks and the oceans.

“These results will also help us understand better ways to lock carbon into the solid Earth, out of the atmosphere. If we can accelerate this process faster than nature handles it, it could prove a route to help solve the climate crisis,” said Redfern.

Reference:
Farsang, S, Louvel, M, Zhao, C et al. Deep carbon cycle constrained by carbonate solubility. Nature Communications (2021). DOI: 10.1038/s41467-021-24533-7

Adapted from a news release by the ESRF

Scientists from Cambridge ̽��ֱ�� and NTU Singapore have found that slow-motion collisions of tectonic plates drag more carbon into Earth’s interior than previously thought.

We currently have a relatively good understanding of the surface reservoirs of carbon and the fluxes between them, but know much less about Earth’s interior carbon stores, which cycle carbon over millions of years

Stefan Farsang

NASA Goddard Space Flight Center

Alaska’s Pavlof Volcano: NASA’s View from Space

̽��ֱ��text in this work is licensed under a Creative Commons Attribution 4.0 International License. Images, including our videos, are Copyright © ̽��ֱ�� of Cambridge and licensors/contributors as identified. All rights reserved. We make our image and video content available in a number of ways – as here, on our main website under its Terms and conditions, and on a range of channels including social media that permit your use and sharing of our content under their respective Terms.

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Cambridge ̽��ֱ�� and Nanyang Technological ̽��ֱ��, Singapore establish new research centre to support lifelong learning

Anonymous — Tue, 06 Oct 2020 14:50:57 +0000

̽��ֱ��Centre for Lifelong Learning and Individualised Cognition (CLIC) is a collaboration between the ̽��ֱ�� of Cambridge and the Nanyang Technological ̽��ֱ��, Singapore (NTU Singapore), and is funded by Singapore’s National Research Foundation.

Cultivating new skills is a lifelong process that requires cognitive flexibility, yet there is currently a gap in evidence-based training programmes that can effectively support and promote this way of learning throughout people’s lives.

Cognitive flexibility goes far beyond conventional IQ; it is the essential capacity for responding to the fluctuating events of the modern world. It underlies adaptive coping to change, and also the generation of innovative, creative thinking.

Trevor Robbins, Professor of Cognitive Neuroscience Psychology in the ̽��ֱ�� of Cambridge’s Department of Psychology and a senior academic advisor to the programme, said: "Understanding the psychological basis of cognitive flexibility and its basis in the brain will have enormous societal benefits, with educational, as well as clinical, impact.”

He added: “This novel and original collaborative programme by two leading Universities will enhance the science of learning by innovative interventions and methods, for training cognitive flexibility over the life span."

̽��ֱ��research programme will be led by Zoe Kourtzi, Professor of Experimental Psychology in Cambridge’s Department of Psychology. Involving researchers in psychology, neuroscience, linguistics and education, CLIC will explore cross-disciplinary ways to develop innovative research in the science of learning. ̽��ֱ��ultimate goal is to translate these research findings into an integrated model of learning that can be applied in the real world, improving cognitive flexibility across the life span.

Research will focus on four life stages - early years, adolescence, young adults and middle age - when flexible behaviour is critical for coping with changing circumstances. During these periods the brain undergoes neural changes such as early maturation, restructuring or resilience to decline, presenting important opportunities for intervention.

NTU Senior Vice President (Research), Professor Lam Khin Yong said: “ ̽��ֱ��cross-disciplinary collaboration between researchers from NTU Singapore and Cambridge ̽��ֱ�� is expected to have wide-ranging impact on workers, as technology and globalisation change the nature of labour markets worldwide.”

He added: “ ̽��ֱ��ability to develop and master new skills at the workplace is becoming increasingly pressing globally. Singapore’s nationwide SkillsFuture programme, for example, gives opportunities for people to develop their fullest potential throughout life. Yet, we know that differences in individual cognitive functions can affect learning and performance. This is where research in the Science of Learning can play a key role in enhancing educational outcomes and practice. ̽��ֱ��new Centre will support the country’s drive in helping the workforce prepare for the digital economy, as businesses turn to automation.”

Annabel Chen, Co-Director of CLIC and Professor of Psychology and Director for the Centre for Research and Development in Learning (CRADLE) at NTU, Singapore, said: “This is an exciting development for research in the Science of Learning. We have been working closely with colleagues from Cambridge, and tapping into expertise across NTU, including the College of Humanities, Arts and Social Sciences, Nanyang Business School, National Institute of Education, Lee Kong Chian School of Medicine and College of Engineering to develop the CLIC programme.”

She added: “This development complements the Science of Learning Initiative in the Centre of Research and Development in Learning (CRADLE), launched by NTU in 2015. With this multidisciplinary effort and input from the Ministry of Education and SkillsFuture Singapore, we believe our programme will be able to provide insights and translatable solutions for the Future of Learning and Economy in Singapore and beyond.”

̽��ֱ��collaboration was brought together through the presence of the ̽��ֱ�� of Cambridge’s first overseas research centre in Singapore, the Centre for Advanced Research and Education in Singapore Ltd (CARES). CARES was established in 2013 under the Campus for Research Excellence and Technological Enterprise (CREATE) – a collection of 15 joint research programmes between local universities and top overseas institutions funded by Singapore’s National Research Foundation (NRF). ̽��ֱ��Centre hosts several research programmes, most of which involve NTU and focus on the decarbonisation of Singapore’s chemical industry.

̽��ֱ��new programme on the science of learning is a novel direction for CARES and CREATE, bringing together expertise from Cambridge and Singapore to investigate new ways of helping people prepare and adapt to the rapidly changing workplace.

A new research centre focused on improving support for lifelong learning and cognitive agility opened on 1 October 2020 in Singapore.

̽��ֱ��programme will enhance the science of learning by innovative interventions and methods, for training cognitive flexibility over the life span

Trevor Robbins

Jess Bailey on Unsplash

Coloured pencils

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