druS

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About druS

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    Meson

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  • Favorite Area of Science
    Quantum

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  1. Lead and Water Pipes

    Hey, mate. I live in Australia and among other things work in hydraulic design in buildings. I haven't heard any of this. Could you expand with reference? The only thing I can think of is some maybe somewhere like Mt Isa where from recollection there has been led deposits found through the developed areas. I'd love to look into it if you can give me more than "proverbial has hit the fan" as I see nothing around it in the media here. BTW there should be no lead discharge from brass fittings as there is none in it.
  2. Thanks Ken. I will find time to dig into your response. Really appreciate you putting the time in to provide it.
  3. Perhaps you can offer a better reference then. What we have from beecee is a detour to a site that invokes me to get excited but does not offer me the film that apparently I need to watch to answer my question. I have seen many scenarios here on this forum where that would meet with moderators making comment. I am happy watch it. Open minded. But the URL sends me to a place that is openly seeking support for advocacy and does not offer viewing of the film. And with or without this possibly eye opening film, my question is very basic. IS a hindcast accurately reported as a projection?
  4. Yes agree beecee. But we confuse a question of science (strengths or otherwise of hindcasting and the accuracy of the reporting) with a matter of ethics or philosophy (cautionary principal) and policy (what we should do about it). My query here is about the system of hindcasting and the accuracy of reporting the results as a projection.
  5. Chinese Fusion

    Hi Michael, mate I will certainly dig into this site (caught time poor right now with study) but tell me - it's not the same thing as the Chinese EAST is it?
  6. beecee, I'm not trying to be funny, I'd like your thoughts (from the reference paper) 'Hindcast' attribution method Is there not a difference between a forecast and a hindcast? A difference between something that a simulation "projects" to something that it looks back on?
  7. Chinese Fusion

    I've been surprised that this report in the local Australian popular press has not tipped interest. calin https://www.abc.net.au/news/2018-11-15/china-attempts-to-create-an-artificial-sun/10495536 My understanding was that once temperature were achieved of something like 60million K that the system would be self sustaining. Here they claim more than that but that it was maintained shortly. What am I missing? Why aren't physicists talking?
  8. Awesome work as usual. While I realised that Fourier transforms "peel apart" (non mathematical and egregiously rough perhaps) the source waves in a signal I wouold not have considred the importance of carefully addressing the frequency and time domains. For a sine wave that only lasts a short time, there is a wider range of frequencies around the signal frequency. This makes perfect sense - I just never would have related it to this:. At the end of the day starting with Fourier tranforms, using Plank's Constant (I presume as a statement of accuracy?) , deriving (please do correct my clumsiness) an inequality which becomes a statement about the Heisenberg uncertainty principal - this is an incredible act of tautology. I may only catch glimpses of it, but it does help remove some of the fear of the bizarreness of QM.
  9. I am not even going to try conceptualise this with my knowledge level, just say that hey, I'm on my way, its going to be slow, but I am coming. In the mean time Eise FWIW you just elevated to sitting behind Sean Carrol as inspiration behind my trying to learn the math behind Quantum. And that makes Feynman #3. Just wow. In quantum mechanics, the momentum and position wave functions are Fourier transform pairs, to within a factor of Planck's constant. With this constant properly taken into account, the inequality above becomes the statement of the Heisenberg uncertainty principle. That is a beautiful statement in so many ways, most of which I don't understand, but I'm getting a hint at the beauty. Thank you. It's a statement I am going to hang on to until I understand more than just the aesthetics.
  10. Iceberg to Capetown

    Thermal storage for air-conditioning is not new, it's a little more complex than your scheme but essentially you've covered the basics. There needs to be a method of moderating the temperature of the air being cooled - it may be a more efficient to use very cold air but there are limitations around thermal comfort and people reacting to cold drafts. I haven't seen systems which bring in external ice though there is no reason not to - short of materials handling logistics. Generally the way that commercial systems work is to use cheap electricity in off peak (night time) when there is a lessor requirement for cooling, to produce ice in stead. And then us the ice for cooling during peak (day time). It does help emissions/carbon etc as it reduces peak load and helps flatten power consumption. The generators are more efficient when closer to peak than at low load. Alternatives are storing chilled water and also "phase change" systems - typically CO2/dry ice.
  11. Condensation Help!

    Nitrogen is roughly 80% of air. Changing from air to nitrogen isn't going to have any material impact. As the sole contributor. However if the nitrogen is dry that would solve the problem. So would using dry air. Removing the air also solves the issue. I'd suggest doing the packaging in a very dry environment. BTW why would you take a tablet from a hot truck to a fridge? Oh another way would be to pack the product in a refrigerated environment to start with. When it goes to a hot truck humidity in the residual air get's smaller, and when it is re-refrigerated you are simply back where you were in packaging.
  12. Engineering Degree Questions

    Wartec, I'd look to a bachelor in Science, and a math major. In my course subjects can be chosen in that background within computing. You are likely to have covered mechanics by that point, but if you need the paper look to a post-grad engineering degree with a computing specialist. If you need it. Depends on the university and the courses offered. Look into it.
  13. Help with college pursuits

    Sean Carrol (my favourite physicist who is alive) suggests that only 1 in 4 of his PhD students get a job in theoretical physics. AP I am 56 years old and there is no way I have a likelihood of being one of Sean's 1:4. I'm chasing it anyway, bloke. You, you at 14 asking these questions, hell I'm jealous. Just go for it. In terms of tertiary study, I can only speak from my limited experience. High school fills a background for tertiary study. So compared to the course I am doing right now, if you do Physics at school with advanced math - you'll take about a year (part time) off my bachelor. Then you want to do a bachelor in science (physics). I'd suggest you need work in maths and physics. So a dual major might appeal. Or not. My current study is problematic as I can't fit all my interests into a double major. At the moment my solution is to focus on a math major and get very broad with everything else. I'm not sure it will last. Ultimately you will want post grad (the bachelor is just a start point) and in partical physics it is likely to be a PhD in theoretical physics. Huh! That's a mouthfull of possibilities. In the mean time my advice is to stick, seriously stick, to the stuff that you find interesting. If it is interesting at 14 it will be also at 56, don't fricking loose time. God I'd love to be hitting this right now at 14. Ultimately, just do it.
  14. The Measure Problem

    Before this discussion may be shut down, I just wanted to say just how much I have enjoyed the responses to OP, especially to the "long termers" here. I'm nothing but a novice but increasingly intrigued by math, for once a discussion I could largely follow. Cheers people.
  15. Flood-related engineering...

    Or the building is old and built to old standards. Or they had not worked to best practice modern design. Or the US is behind in building standards. Or they the systems worked which is why emergency teams were there etc etc . Who knows. Having an emergency does not in itself mean a failure of design. The 1:100 benchmarks should be under review pretty much everywhere - a basic tool of adaptation. Though in my experience it tends to happen through Green Building Ratings Systems - such as LEEDS in the US. Legislation and the Standard writers tend to lag the latest thinkers such as adaptation measures in LEEDS (or GreenStar in Australia, or BREAM in the UK). Generally (as I mentioned) this particular issue would be handled through entries to the basements rising to a 1:100 (or other design) level before ramping down. But it won't stop every eventuality. On the whole there have been few experiences like the one under discussion. Not something that is going to suddenly impact building standards around the globe. Where say, something like Grenfell Tower fire in London - certainly impacting local building standards here in Sydney, and I suspect a rolling impact around the world.