Frank

One consideration is that GPU tends to be memory space limited due to expense of fast RAM. So very large structures might be better on the CPU side or CPU side breaks down the size of data needed to something manageable by the GPU side(s). in cryptocurrency mining, multiple GPU boards can run on a single system, so some fast parallel processing can then be done.

Maybe a sparse octree for 3d representation, but I don't know if GPU libraries are easily available. Maybe Nvidia?

I'm guessing it's an economic problem, not an engineering one. Lives in the balance: climate change and the Marshall Islands | Environment | The Guardian: https://www.theguardian.com/environment/2016/sep/15/marshall-islands-climate-change-springdale-arkansas Adding insult to injury: United States withdrawal from the Paris Agreement - Wikipedia: https://en.wikipedia.org/wiki/United_States_withdrawal_from_the_Paris_Agreement [Nasty comment about Trump omitted]

If we're going to blue sky, we should add non-potable water as "ground-source" heat-pump loop. Heat or cool your home using non-potable water as a heat source or sink. It's actually the best way to go 100% electric heating in northern climates. Also requires separate storm sewers BTW, otherwise we're processing the effluent in larger quantities because once mixed, it all needs to be processed.

Salt water might kill vegetation and the quantity of municipal water used in the event of a fire seems to be manageable by existing infrastructure. I'm more concerned that the pace of forest fire events is increasing due to Climate Change and feel this is what should be addressed more seriously.

Don't they do water drops from a plane or helicopter filled from a lake or ocean? Aerial firefighting - Wikipedia: https://en.wikipedia.org/wiki/Aerial_firefighting

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Yeah, I think they confused litres of methane with either CNG or LNG... Don't feel like doing the math, but 900l methane/day is 900l * 0.641g/l=576.9g : Calculate the density of methane gas, CH4, in grams per liter, at 25.0C and 0.978 atm.? | Yahoo Answers: https://answers.yahoo.com/question/index?qid=20110224194358AAkQ5Ug energy density is ~52 MJ/kg, so 30 MJ/day ; Energy Density of Methane - The Physics Factbook: https://hypertextbook.com/facts/2004/BillyWan.shtml 0.4 MJ per kilometer, so 75 km assuming 100% conversion, probably closer to 20 km, certainly not all day, also 8 kWh/day according to google 100% conversion. Didn't verify the sources. Tesla ref. 0.4 MJ per kilometer: The Secret Tesla Motors Master Plan (just between you and me) | Tesla UK: https://www.tesla.com/en_GB/blog/secret-tesla-motors-master-plan-just-between-you-and-me?redirect=no

So first off, it's probably the WORST way to power your cell phone. But... Cows do produce a significant amount of methane: Cows wear BACKPACKS to capture methane emissions | Daily Mail Online: http://www.dailymail.co.uk/sciencetech/article-2606956/Now-THATS-wind-power-Cows-wear-BACKPACKS-capture-emissions-miniature-power-stations.html So instead of a cumbersome backpack, a small accumulator, generator and battery combo could harvest this energy. When the cows come in for milking, they can help power the farm! It also reduces GHG by converting methane to CO2 and offsetting some power generation emissions.

Also wifi beacons: Wi-Fi challenges Bluetooth for the beacon market | Computerworld: https://www.computerworld.com/article/2975859/mobile-apps/wi-fi-challenges-bluetooth-for-the-beacon-market.html

Fair enough. Considered deleting that last post after re-reading yours to the end. Had a bit of a reaction to everything is fine in the first part. I understand retrofitting/upgrading is beyond what will happen in real life, sadly. Not every building has weather proof backup generators, batteries or personnel dedicated to smooth operation, so more passive/all-encompassing measures seemed interesting to explore.

Except none of the "sufficient measures" worked in flooded basement and power out situation given in the OP, so there's room for improvement given our new reality of frequent 1 in 100 year weather events.

I guess I'm trying to say is that putting the largest stress (collected water) in the centre of a large structure, basically at it's weakest point, seems like the hardest way to collect water. Water is heavy, so diverting it to the ground, or to an aqueduct to avoid pumping, using a dome or other water shedding structure would be a better way, assuming a covered city is desirable in the first place.

Are 555 timer chips still used? 555 timer IC - Wikipedia: https://en.wikipedia.org/wiki/555_timer_IC

2. I read this nice article about the feasibility of covering (or maybe a proposal to cover) a city and it involved a structure (like a geodesic dome) and panels of ETFE which need to be pressurized to maintain shape, but can't find said article. The structure is needed in case a hole develops in the clear panels and to prevent a total collapse as could happen with a pressurized dome. Crews/maybe robots would repair damage. I still think it's much too expensive simply as a city cover, but has applications in uninhabitable places on earth and off, like deserts, Mars or the moon. Wonder how tall a dome is needed to protect from cosmic rays given a 1 atm pressure and reduced gravity? Found this later: environment - Could permanent self-sustaining biodomes be built on Mars? - Space Exploration Stack Exchange: https://space.stackexchange.com/questions/10329/could-permanent-self-sustaining-biodomes-be-built-on-mars

1. Buoyant elevators, so they can float above the water level. Add foam to the bottom, increase counterweight. 2. If the city's sewers can't handle the downfall, it's unlikely there is a cost-effective way to redirect the flow to farms. 3. Stop Climate Change. Stronger storms are associated with global warming. Infrastructure built to past spec doesn't handle this new reality well.

Have you tried google? Yes it can be done.

Modernize it with AM/FM to bluetooth, but that also likely exists. People stream music on their cell phones now, even radio station broadcasts, so I think that ship has sailed.

So, use an engraver then colour in the grooves, wipe off/remove the colour spilled out of the grooves? Maybe fill grooves with permanent marker. Might make a nice life hack or instructible. Examples of "utensils" - are we talking fork, knife, spoon or something else?

Outside the elevator to look-up the floor/office number. An App to guide you to the right office/store area, NFC to select floor, open secure doors. More creepy - facial recognition to do the same. Don't forget to display geo-located ads - menswear, women's lingerie ... might work inside the elevator for a store.

Homework? Orthographic projection - Wikipedia: https://en.wikipedia.org/wiki/Orthographic_projection First Angle Orthographic Projection: http://www.technologystudent.com/designpro/ortho1.htm

Worlds most efficient bicycle drivetrain? OK, it's not as practical nor as aerodynamic, but technically... Penny-farthing - Wikipedia: https://en.wikipedia.org/wiki/Penny-farthing

Cool, but how does it shift? if the next gear up has one extra point/groove, then the gears are only aligned at one point in the rotation. "In its current form, DrivEn can’t shift between gears, although BikeRadar reports that this could conceivably be managed using a wireless servo to move the rear bearing mechanism fore and aft relative to the cassette." - World’s Most Efficient Bicycle Drivetrain Unveiled at Eurobike | Newfoxy: http://www.newfoxy.com/2018/07/11/worlds-most-efficient-bicycle-drivetrain-unveiled-at-eurobike/

Cool! Patent number?

Not hiring people like you might be why I've never hear of them... Being an inventor isn't easy, torn between inventing and making a "standard" living. If you're lucky enough to make your first venture pay off, then it can fund the next ones, but that first one, like any invention, has a low chance of commercial success. On the other hand, Switzerland is a great place to live so you can keep working at it. I'm not in a position to advise you, but I'm trying networking to find partners and pursuing relatively cheap ideas to kickstart this process, then maybe someday fund the big/expensive ones. I suppose also, that distance isn't as much of a factor given the internet, and 3d-printing makes manufacturing capability (maybe not for a jet engine) less expensive. Exciting times.