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The main objective of the re-design is the weight reduction maintaining the strict mechanical constraints on deformation and static balance as the part rotates at high speed. For the scope, the mirror body and inner lattice structures are modeled using FEM.
Hey JV (2014) Design, implementation, and characterization of a novel lidar ceilometer. Springer Cham, London. https://doi.org/10.1007/978-3-319-12613-5 The question - which has since been shared on social media - starts off like this: "Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates. Cheryl then tells Albert and Bernard separately the month and the day of her birthday respectively."We must prioritise and put more funding behind scientific and multi-disciplinary research. At the moment, Arctic science is concentrated on its summer, with the Arctic winter which could tell us an enormous amount about the weather being under-studied. More collaboration is needed among UK universities to avoid repetition of scientific endeavours seeking out the same information, and with our international partners to learn and share resource." Many functionalities are demanded to this subsystem. Since it is under rotation, the mechanical balancing must be assured through an adequate stabilization to take care of the deformation which may affect the reflective surface. Modern LIDAR systems for aerospace applications require complex optical elements whose performance and lighter weight must be improved to meet growing application requirements. Metallic optics are a good choice to achieve the desired performance. Our speculum metal mirror is about the same size as that for the reflecting telescope with which William Herschel discovered the planet Uranus in 1781 – the first planet to be discovered with a telescope. We have a similar reflecting telescope made by Herschel on display in the Science City gallery, as well as the mirror which we had specially made. https://www.elementum3d.com/wp-content/uploads/2021/12/An-inside-look-at-how-AM-commercial-aluminum-alloys-are-made-possible-using-RAM-technology.pdf The remote sensing and scanning technologies have recently received large amounts of attention by the industrial and academic communities. The term remote sensing was coined in the 1950s and lately defined as the method employing electromagnetic energy to detect, achieve, and measure the geometrical feature of a target [ 1].
I see that we have assisted you in the past multiple times, Goodwill is not guaranteed and very limited at this time. This measurement principle is usually referred to as time of flight (ToF). ToF can be obtained by sending through a laser a pulsed signal, and by measuring the phase and frequency of the reflected light signal with respect to a reference. One of the most important, yet underappreciated, features of the Arctic sea ice is the ability of its blindingly white surfaces to reflect sunlight. For at least as long as our species has existed, the frozen seas at the top of our world have acted as a massive parasol that helps keep the planet cool and its climate stable. Terry ground the mirror against the convex disc using ever finer pastes of water mixed with sand, from coarse, gritty grades right down to ground pumice stone as smooth as flour. He then polished it to a high shine on a bed of slightly softened set pitch, or tar, with polishing powder. This is exactly what earlier astronomers did: William Herschel ground his speculum metal mirrors with coarse emery and water; Newton polished his on a bed of pitch while John Hadley similarly used pitch-soaked silk. Left: The coarsest sand used for grinding the mirror. Sand sold in pet shops to line birdcages proved particularly effective! Right: The bed of pitch, also known as the pitch-lap or polishing-lap, on which the mirror was finally polished. Credit: Matthew Howles. Fan Y, Dong D, Li C et al (2021) Research and experimental verification on topology-optimization design method of space mirror based on additive-manufacturing technology. MDPI Machines 9(12):354. https://doi.org/10.3390/machines9120354We had a go at making speculum metal telescope mirrors – arsenic NOT included – as part of a “how-it’s-made” film for the Science City gallery. We wanted to showcase some of the extraordinary craft skills needed to produce many of the historical scientific instruments in our collection. The Government's own watchdog tells us that delaying climate action will increase energy and transport costs for UK households. We want to see Rishi Sunak's sums to see what he based his decision on. As we approach the next general election all political parties must pledge their continued commitment to follow the science and listen to the independent advice of the Climate Change Committee." Most Read Tan Q, Zhang J, Sun Q, Fan Z, Li G, Yin Y, Liu Y, Zhang MX (2020) Inoculation treatment of an additively manufactured 2024 aluminium alloy with titanium nanoparticles. Acta Mater 196:1–16. https://doi.org/10.1016/j.actamat.2020.06.026
This would result in a much colder climate for the UK while accelerating warmth in the tropics. Some scientists predict this could happen next century. James Gray, Chair of the polar research sub-committee, said: "For too long the effects of a changing Arctic have been out of sight, out of mind. Before melting glaciers and ice sheets contribute to widespread flooding and irreversible weather patterns in the UK, we must throw our full toolbox at understanding changes in the Arctic better." Boschetto A, Bottini L, Veniali F (2017) Roughness modeling of AlSi10Mg parts fabricated by selective laser melting. J Mater Process Technol 241:154–163. https://doi.org/10.1016/j.jmatprotec.2016.11.013 Kovalev VA, Eichinger WE (2004) Elastic Lidar: theory, practice, and analysis methods. Wiley-InterscienceInside permafrosts are masses of biodiversity which humanity still has much to learn about including microbes known as extremophiles. The findings have been published but not peer-reviewed, which reads: "One quarter of the northern hemisphere is underlain by permanently frozen ground, referred to as permafrost. As well as some beautiful refracting telescopes in this gallery, we currently have one of the very earliest reflecting telescopes on display, generously lent by the Royal Society. It was made in the early 1670s by none other than Sir Isaac Newton and used mirrors to gather light, rather than lenses as found in refracting telescopes. In fact, Newton is often credited with inventing the reflecting telescope – but it’s worth remembering that contemporaries like James Gregory were experimenting with similar designs at this time. Albert says: "I don't know when Cheryl's birthday is, but I know that Bernard does not know too," and Bernard states: "At first I don't know when Cheryl’s birthday is, but I know now." This then prompts Albert to say: "Then I also know when Cheryl's birthday is."
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