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    JohnWilliamStrutt

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    [–] The Office of Naval Research (ONR) is developing an “omniphobic”coating that can repel water, oil, alcohol and even peanut butter, and might save the U.S. Navy millions of dollars in ship fuel costs, reduce the amount of energy that vessels consume and improve operational efficiency. JohnWilliamStrutt 6 points ago in Futurology

    The coating concept is not new and such coatings already exist. They are correctly termed superhydrophobic rather than omniphobic. A superhydrophobic coating that has a contact angle of 180* [the highest possible phobicity] with water will have a contact angle >120 degrees with the other substances listed, so it will be "omniphobic".

    I think the key here is potentially being able to make a durable coating by making a rubberlike polymer. This will have the added advantage of being a compliant coating - which fluid dynamicists have been researching for years for drag reduction. e.g. http://rspa.royalsocietypublishing.org/content/453/1965/2229

    So drag reduction via a compliant, phobic coating could be significant in some* applications. [*likely not submarines or anything that spends most/all of its time underwater]

    [–] Perth dad fined $200 for drinking a beer while fishing JohnWilliamStrutt 1 points ago in perth

    I find this somewhat ridiculous given that WA police do not have the power to charge people drinking on a boat (or being over 0.05 while in charge of a private boat).

    [–] Has anybody successfully left the Environmental field? JohnWilliamStrutt 1 points ago in environmental_science

    I know several people who started out in environmental science and then moved into statistics/data science or health science.

    Usually with further study though (unless they already had a PhD).

    [–] Blasta Brewing Company JohnWilliamStrutt 1 points ago in perth

    Nice. I will have to check them out. However the offerings seem limited from their website. 3 American style (I)PAs and 2 Wheat beers.

    [–] The untold story of the death of the NBN | First Dog on the Moon JohnWilliamStrutt 13 points ago in australia

    Wasn't the NBN supposed to futureproof our internet infrastructure?

    Wasn't it claimed that FTTH / FTTP was more than we would ever need?

    Now most of the installs are not fast enough to meet current demand it seems?

    [–] First day planting beans JohnWilliamStrutt 2 points ago in farming

    Cheers. I have never seen it used here.

    [–] First day planting beans JohnWilliamStrutt 2 points ago in farming

    What is the white powder?

    [–] Weed Identification App or Tool JohnWilliamStrutt 3 points ago * (lasted edited 19 days ago) in farming

    Australia has an app for pests and weeds! https://www.agric.wa.gov.au/pests-weeds-diseases/mypestguide You can upload a photo via the app or website and the team of experts at the AG department will ID it and tell you what it is - usually within 24 hours.

    EDIT: I have been told that people have used the app from outside AU and get a response. There is also one specific to weeds: https://www.agric.wa.gov.au/myweedwatcher-information

    [–] Seeding in the Wheatbelt JohnWilliamStrutt 2 points ago in farming

    Yes small rainfall window and very hot summer.

    [–] Corn taking off JohnWilliamStrutt 2 points ago in farming

    Food, Fodder or Ethanol?

    [–] From an environmental standpoint, is it better to close my curtains, turn on the lights, and run the A/C less, or keep the curtains open, the lights off, but make the A/C run more? JohnWilliamStrutt 1 points ago in environmental_science

    It sounds like you need more roof insulation. Where we live it gets to 115F in summer and the house is hotter inside too. However putting extra insulation in the roof and installing a few sets of french windows (full height double windows/doors) to get the airflow going has meant that we only need to run AC on a few very hot days each year.

    [–] From an environmental standpoint, is it better to close my curtains, turn on the lights, and run the A/C less, or keep the curtains open, the lights off, but make the A/C run more? JohnWilliamStrutt 10 points ago in environmental_science

    It takes a lot of lighting to get anywhere near an AC system.

    e.g. Lets consider a big old incandescent 100W bulb vs a small AC unit that might be 3000W.

    Lets say the 100W bulb is running constantly for 16 hrs (I assume you need to sleep) = 1.6 kWh. Compared to a 3000W AC running on a 20% duty cycle for 24 hours = 14.4 kW, so 9* higher.

    You can switch to LED lights which will use a fraction of the above.

    You don't mention the option of opening a window and/or using pedestal/desk fans. These are much better environmentally than your AC.

    [–] Seeding in the Wheatbelt JohnWilliamStrutt 1 points ago in farming

    I have had 90 mm already!

    [–] Seeding in the Wheatbelt JohnWilliamStrutt 1 points ago in farming

    Not my video. This is Western Australia. Where they produce 80% of Australia's export wheat. Australia is 3rd-5th worldwide in terms of wheat exports. All the wheat is dry grown - with one of the shortest growing seasons worldwide.

    [–] Rock picking. The perfect free workout JohnWilliamStrutt 1 points ago in farming

    You are welcome to send them to my place...

    [–] soil pH change from wood ash. JohnWilliamStrutt 2 points ago in farming

    Yes. Wood ash is alkaline so increases soil pH. I am just surprised by how much.

    [–] soil pH change from wood ash. JohnWilliamStrutt 2 points ago in farming

    The soil on the right is basically "before", the soil on the left is "after" being covered in wood ash.

    [–] soil pH change from wood ash. JohnWilliamStrutt 2 points ago in farming

    I posted a pic of some sections of trash I was burning off the other week. I went in and did some tests on the fire break (no ash) vs the burnt areas (ash) about 1 m (~3 ft) apart in each case. This is a typical example. This is only the top 1/2" or so though.

    [–] Americans fighting for Germany during World War 2? JohnWilliamStrutt 129 points ago * (lasted edited a month ago) in history

    This article on the British Free Corps may interest you: https://en.wikipedia.org/wiki/British_Free_Corps https://americansinwwii.wordpress.com/2012/08/30/have-americans-ever-heard-of-the-british-free-corps/

    The comments on the 2nd link make some mention of Americans:

    I’ve seen only one documented case of an American serviceman going AWOL and joining up with the Nazis, eventually taking an oath with the SS, and that was former pilot Martin James Monti. Unless you are speaking of German-Americans that left the US to go fight for Germany, in which case, I would call them traitors if they were already US citizens. But I do not have any evidence of an “American Free Corps,” thus why I did not write on such a thing.

    [–] Some arrowheads found on the farm. What are some cool items you’ve found? JohnWilliamStrutt 5 points ago in farming

    I haven't found anything on my place, but my uncle has found several stone axe heads on his farm. He gave one to me when I was a kid.

    I don't have pics of the exact ones, however they look like this: https://www.vic.gov.au/system/user_files/Documents/av/GroundAxes.pdf

    Some of them are still polished, others are very weathered - maybe 10000+ years old - and you need to look hard to see they have been shaped.

    [–] Can metals evaporate? If so, can the gas be condensed back into solid metal? JohnWilliamStrutt 5 points ago in askscience

    Yes, in fact this is how Silicon (technically a metalloid not a metal) is purified to a high enough level to make computer chips (etc.).

    Many gas phase (metal) nanoparticle production processes involve evaporation and condensation. You can get very small and very pure nanoparticles using this method.

    Even flame synthesis of metal oxides (Ti, Mg etc.) involve burning a metal and then condensing the oxide. This is how the pigments in many paints are made.

    Any device that involves a heated metal wire (toaters, e-cig coils, etc.) will also sublimate/evaporate metal nanoparticles.