Author Archives: Eann Patterson

Thinking in straight lines is unproductive

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I suspect that none of us think in straight lines.  We have random ideas that we progressively arrange into some sort of order, or forget them.  The Nobel Laureate, Herbert Simon thought that three characteristics defined creative thinking: first, the willingness to accept vaguely defined problems and gradually structure them; second, a preoccupation with problems over a considerable period of time; and, third, extensive background knowledge. The first two characteristics seem strongly connected because you need to think about an ill-defined problem over a significant period of time in order to gradually provide a structure that will allow you to create possible solutions.    We need to have random thoughts in order to generate new structures and possible solutions that might work better than those we have already tried out; so, thinking in straight lines is unlikely to be productive and instead we need intentional mind-wandering [see ‘Ideas from a balanced mind‘ on August 24th, 2016].   More complex problems will require the assembling of more components in the structure and, hence are likely to require a larger number of neurons to assemble and to take longer, i.e. to require longer and deeper thought with many random excursions [see ‘Slow deep thoughts from planet-sized brain‘ on March 25th, 2020] .

In a university curriculum it is relatively easy to deliver extensive background knowledge and perhaps we can demonstrate techniques to students, such as sketching simple diagrams [see ‘Meta-knowledge: knowledge about knowledge‘ on June 19th, 2019], so that they can gradually define vaguely posed problems; however, it is difficult to persuade students to become preoccupied with a problem since many of them are impatient for answers.  I have always found it challenging to teach creative problem-solving to undergraduate students; and, the prospect of continuing limitations on face-to-face teaching has converted this challenge into a problem requiring a creative solution in its own right.

Source:

Simon HA, Discovery, invention, and development: human creative thinking, Proc. National Academy of Sciences, USA (Physical Sciences), 80:4569-71, 1983.

New horizons

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Along with many people, I have been working from home since mid-March and it seems likely that I will be doing so for the foreseeable future.  Even if a vaccine is discovered for COVID-19, it will take many months to vaccinate the population.  For the first few months of lockdown, I worked on an old workbench in the basement of our house; however, now I have an office set up in the attic and the picture above is the view from my desk.  It certainly has eye-stretching potential but it is also frustrating because I can see the roof of the building in which my university office is located.  However, the lockdown in the UK has been relaxed and so we are going on holiday to Cornwall where we will be walking sections of the South West Coastal Path and reading a pile of books.  If you want experience the walking with us then I recommend reading ‘The Salt Path‘ by Raynor Winn [see ‘The Salt Path‘ on August 14th, 2019]. Although I will be indulging in a digital detox [see ‘Digital detox with a deep vacation‘ on August 10th, 2016] combined with some horizon therapy [see ‘Horizon therapy‘ on May 4th, 2016], the flow of posts to this blog will be uninterrupted because lock-down has allowed me write sufficient pieces in advance to maintain the publishing schedule.

I noticed that both of the posts cited above about the importance of relaxing were published in 2016, along with Steadiness and Placidity on July 171th, 2016.  2016 must have been a stressful year!

Graphite for Very High Temperature Reactors (VHTR)

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One of the implications of the second law of thermodynamics is that the thermal efficiency of power stations increases with their operating temperature.  Thus, there is a drive to increase the operating temperature in the next generation of nuclear power stations, known as Generation IV reactors.  In one type of Generation IV reactors, known as the Very High Temperature Reactor (VHTR), graphite is designed to be both the moderator for neutrons and a structural element of the reactor.  Although the probability of damage in an accident is extremely low, it is important to consider the consequences of damage causing the core of the reactor to be exposed to air.  In these circumstances, with the core temperature at about 1600°C, the graphite would be exposed to severe oxidation by the air that could change its material properties and ability to function as a moderator and structural element.  Therefore, in recent research, my research group has been working with colleagues at the UK National Nuclear Laboratory (NNL) and at the National Tsing Hua University (NTHU) in Taiwan to conduct experiments on nuclear graphite over a range of temperatures.  Our recently published article shows that all grades of nuclear graphite show increased rates of oxidation for temperatures above 1200°C.  We found that large filler particles using a pitch-based graphite rather than a petroleum-based graphite gave higher oxidation resistance at these elevated temperatures.  This data is likely to be important in the design and operations of the next generation of nuclear power stations.

The work described above was supported by the NTHU-University of Liverpool Dual PhD Programme [see ‘Citizens of the world‘ on November 27th, 2019] and NNL.  This is the fifth, and for the moment last, in a series of posts on recent work published by my research group.  The others are: ‘Salt increases nanoparticle diffusion‘ on April 22nd, 2020; ‘Spatio-temporal damage maps for composite materials‘ on May 6th, 2020; ‘Thinking out of the box leads to digital image correlation through space‘ on June 24th, 2020; and, ‘Potential dynamic buckling in hypersonic vehicle skin‘ on July 1st, 2020.

The image is figure 5: SEM micrographs of the surface of petroleum-based IG-110 graphite samples oxidized at various temperatures from Lo IH, Tzelepi A, Patterson EA, Yeh TK. A study of the relationship between microstructure and oxidation effects in nuclear graphite at very high temperatures.  J. Nuclear Materials. 501:361-70, 2018.

Source:

Lo I-H, Yeh T-K, Patterson EA & Tzelepi A, Comparison of oxidation behaviour of nuclear graphite grades at very high temperatures, J. Nuclear Materials, 532:152054, 2020.

Balancing conscious and unconscious life

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Recently, I visited a local artist to choose a painting for a birthday present.  He showed me a pair of small oil paintings in which I had expressed an interest via photographs he had sent me by email.  I agreed to buy both of them and then we drifted into his studio where he showed me the pieces he was working on.  There were many unfinished paintings and he described how difficult it was to finish some of them.  He measured the time taken on some of them in months and, for a few, in years.  I was struck by the similarity with scientists who indulge in slow-motion multi-tasking and switch between research projects in different fields, often leaving something unfinished to focus on something else and then returning to pursue the original research topic [‘Slow-motion multi-tasking leading to productive research‘ on September 19th, 2018].  I suspect both artists and scientists who indulge this approach are looking to achieve ‘a perfect balance of their conscious and unconscious life’ out of which Barbara Hepworth believed ideas are born and realized [see ‘Ideas from a balanced mind‘ on August 24th, 2016].

The studio in the photograph is Barbara Hepworth’s in St Ives, Cornwall.