Moontanman

Why not just put a sunshade at Venus' lagrange point 1? A thin reflective mylar type sunshade would drop the temps very fast and result in a planet covered in frozen CO2!

Damn it! We didn't get to see the boobies! 

9 hours ago, we2 said:

There was a time when I was an Atheist, however, I had an experience that laid me to question creation and I started studying which led to my belief in God today.

I studied the bible and other religious works to come to the conclusion that lack of belief is the only reasonable stance to take on the issue of gods.  

Real music! 

I'm a nudist, I never saw any reason to reveal that here, never really seemed relevant to any issues I was discussing. But now that we have a nudist thread i would say that my username is associated with my nudity and that I love to walk around the beach in the nude but nude swimming is heaven on earth! I am, btw, an atheist and see no way to connect my love of being nude (naked means you are nude and up to something) of course these days i supplement my income via paypal donations by people who want me to keep my clothes on! 

11 hours ago, NTuft said:

Any thoughts/experience on/with methylene blue for that purpose? Or what do you suppose could treat in the aquarium?

Methylene blue can be used as a rinse to clean off nets, When I ran a petshop I kept methylene blue in containers near the fish bagging station to keep nets soaked in why waiting to be used. I've also used peroxide in the net dip containers and I use peroxide to clean equipment like filters and other accessories. Drying the plastic parts out over night will remove the peroxide.  

"in the aquarium" is tricky, most people would use antibiotics instead of disinfectants, few disinfectants are any better at killing bacteria than they are at killing fish.  

11 hours ago, NTuft said:

 

I should correct my over-selling of Palmolive -- they make a claim about efficacy that is limited to a few bacterial strains, so even my altered claim of efficacy is probably still an over-statement.

Palmolive or any soap is a bad idea in aquariums, it's difficult to really rinse off but it's deadliness to aquatic life is less than it used to be but still not low enough to be used in an aquarium.  

On 9/18/2022 at 9:50 AM, NTuft said:

@jmf I presume you looked at the study based on your comment about sodium hypochlorite. "Concentrated original Lysol" performed well, as did sodium chlorite with an activator (sounds like MMS, which might be good for disinfecting aquarium tools; but double check). I would suggest Palmolive with lactic acid or some other things, but again, the concentrated Lysol at 1% seemed effective in a study so that carries it. Perhaps the Palmolive in a strong solution for cleaning gross contamination, followed by the soak in 1% lysol. Appreciate the mention of mycolic acids...  doubt a regular soap saponifies those cords. Plus if they're acid resistant then they're the 0.1% that escapes the lactic acid, and they're catalase positive, but I doubt they'd enjoy the l-lactic acid or peroxide regardless.

 

https://www.researchgate.net/publication/238046154_Efficacy_of_Common_Disinfectants_against_Mycobacterium_marinum

I think you have forgotten that the OP is talking about aquariums. Things like "Lysol" and Palmolive are quite poisonous to aquatic life and would be worse than the bacterium.  

2 hours ago, TheVat said:

Spit-take!  There needs to be a web initialism, SCOS.  Spewed coffee on screen.

 I believe the early 20th century comic actor WC Fields might have been allergic to water.

Never drink the water... fish have been fucking in it... 

21 hours ago, studiot said:

Of course they would, but I'm not talking about their publicity department.

They certainly invented Nylon and ICI held a licence for its manufacture in the UK.
But after the war the Sherman Act cause bitterness and much litigation over this licence.

 

 

Wikipedia will do

https://en.wikipedia.org/wiki/Polyethylene_terephthalate#cite_note-9

 

There is a facebookmemories group you might be interested in for the now defunct ICI fibres.

https://www.facebook.com/groups/332552444829415/

 

Perhaps there is one for Du Pont ?

There is a local page for the Cape Fear Site, but I know of no company wide pages for Dacron. 

21 hours ago, studiot said:

But you must have more interesting tales you can share from that time ??  +1

Oh you don't know the half of it but most of them require some knowledge of the process to really make any sense. 

Having a tube core explode next to you while you are up close to rotating and or hot equipment and can't let yourself move at at all is a classic. 

21 hours ago, studiot said:

As a matter of interest I recall being taught that Dacron was acquired by DuPont from the  pre-ICI who invented the stuff (then called terelene).
We understood that the US had nylon and the UK had terelene.

I'm not sure about that, it was never discussed, DuPont pretty much claimed they invented it.  

21 hours ago, MigL said:

Tape ????
How long ago did you work there ?

I worked there from 1973 to 1998, we had a worldwide computer network going there by the early 80s, I loved to surf the other DuPont sites around the world. We used computers to monitor our processes in real time and they were linked to all the dupont sites around the world. I remember really enjoying talking to DuPont in Australia! 

21 hours ago, MigL said:

The OP is rather open ended, so you may have been a bit brutal, John ...

21 hours ago, John Cuthber said:

Does that mean it's a video on polyester on polyester?

 

I never thought of that but it makes sense. 

19 hours ago, TheVat said:

I've gravitated back to natural fibers and goose down, partly due to the plastic nanoparticles issue, and can report that's an expensive path.  But comfortable on the skin when you replace poly blends with straight cotton.  All I know about cotton is that it gets stronger and wrinkles less when mercerized (soaking in NaOH), which is useful for clothes but not for towels (unmercerized absorbs water better).   

I prefer natural fibers as well. We made polyester that was like spider silk and some that was almost like rope, good times for all ! 

37 minutes ago, Phi for All said:

The feel and consistency of our clothing has a lot to do with physics, which is also fascinating, but a separate topic. Spinning fibers changes the way fabric moves and stretches. 

I worked for DuPont, the Cape Fear site, we made Dacron polyester, the way fibers can be manipulated on the manufacturing level is mind bending. And physics is a big part of it. But we made clear polyester all the way up to what we called "dull" fibers that were so full of titanium dioxide they looked like double white or something, hard to really describe, but the properties of the polyester determined how it would take dye and feel when you wore it. We had a large lab and engineering section and we made experimental fibers some of which were silk like to fibers that looked like aluminum foil threads.

Polyester is made from plastic that is stretched and otherwise manipulated to resemble other fibers. Dacron is just one of many fibers bother natural and artificial. I have a small video that shows parts of the process, it can be amazingly complicated, but it's on tape and I am not supposed to share it anyway. 

I always use hydrogen peroxide to clean my fish tanks when I take them down, it must be rinsed well and allowed to dry for a few days. Sodium hypochlorite has the advantage that commercial aquarium products are sold to neutralize it.  

On 9/2/2022 at 12:27 PM, Phi for All said:

And consider the resolution in that snap. Smartphone cameras are simply amazing these days. People have to actually be careful what they take a picture of, since it just takes two fingers to zoom in and read license plates and documents sticking out of people's pockets. It's now a trope in movies and TV that phone photos have identifiable antagonists lurking in the background, yet the modern photos of BF remain grainy and shaky.

What you said is true but some photos suffer from the "To good to be true" syndrom. Personally I think Bigfoot is misidentification of black bears, but that is just my opinion. 

Also there is the road kill hypothesis, everything, even humans eventually end up as road kill... even humans, but no bigfoot road kill ever... 

Hey! A fellow hillbilly! Have you seen a bigfoot in WV? I lived in around and near Sissonville WV, what part you from? I lived pretty far out in the sticks, I was raised by my grandfather who was Cherokee. I asked him about bigfoot a few times. He said it was just a story to scare children, he was a master trapper and woodsman. I always accepted what he said but I still always kept an eye out for tracks when out in the woods. 

2 minutes ago, mistermack said:

That's difficult to picture. Helium rises here on Earth, so it's likely to float upwards and away in a 10 bar atmosphere. What about gravity, if the planet is bigger and more massive than the Earth? How would the humans cope with it?

The gravity on this planet should be enough to hold onto helium, at least i hope so, if not I'll have to go with a oxygen nitrogen atmosphere like the earth. 

Humans will be limited to short stays on the surface, weeks, but will have mechanical exoskeletons to help them cope. The atmospheric pressure is equal to 330 feet below the ocean's surface on Earth which is doable but will have to have something to prevent nitrogen narcosis. . 

On 8/12/2022 at 9:59 AM, studiot said:

Yes I understand that, but I am asking why is that important ?

I am setting the stage for a series of short stories set on a large planet with a 10 bar atmosphere and a group of human researchers who live on the planet. I am trying to make the initial set up as accurate as possible. I am also trying to get a reasonable way to include helium in the atmosphere. 

On 8/12/2022 at 9:59 AM, studiot said:

Did you catch my comment/question about the importance of Pluto's very tenuous atmosphere ?

Yess I did. 

On 8/12/2022 at 9:59 AM, studiot said:

It is really only very simple arithmetic to derive the end formula which is vry simple and all that matters.

Skip to the end and let swansont or joigus or janus dissect it, as I'm sure they will.

I will try to plot a suitable graph of the result, that may help visualisation.

I should also point out that some planets are spinning faster than others and the rotation makes a measurable difference to the apparent gravity.
My calculations assumed a non rotating planet.

My planet will rotate in about 36 hours. 

On 8/12/2022 at 8:07 AM, swansont said:

 

45 minutes ago, swansont said:

Do you mean the density of the two is equal?

No, I am referring to the gravity at the surface, density would vary as the surface gravity differs on each object. The larger object would have less density, I used to have a site I could go to that would calculate these things for me after I plugged in the parameters. If i remember correctly the larger object would have 15.625 times the volume of the earth, the mid sized object would have 8 times the volume of the earth and the smaller one would have 1 times the volume of earth. which would mean the smaller object would have to have 2x the density of earth, the medium sized object would have the same density as earth and the largest object would have less density than earth. I can't remember the mass of the larger object but it seems as though it was someplace close to 12 times the mass of the earth.  

1 hour ago, studiot said:

On first reading I thought only mass was involved, but on more carefull reading I see that you have incorporated density difference.

I have now had the time to sketch out some maths.

 

Thanks for the math but I am afriad it is beyond my limited ability. 

19 hours ago, studiot said:

Hi, Moon.

I'm not sure why you homed in on the 'extensiveness' of the atmosphere  ?

As Janus points out there are many variables involved and it should be borne in mind that the importance of a planet's atmosphere does not depend upon its extensiveness.

A fine example of that is the discoveries made by the New Horizons team in respect of Pluto, whose atmosphere was regarded as 'thin to non existent' before the spacecraft flew by.
Now we know the profound effect this thin to non existent atmosphere has on that planet's geohistory.

 

 

By vastness I am alluding to the volume and mass of the atmosphere, like how Saturn's moon Titan has a very large atmosphere, deeper than even earth's. 

2 hours ago, studiot said:

Hi, Moon.

I'm not sure why you homed in on the 'extensiveness' of the atmosphere  ?

As Janus points out there are many variables involved and it should be borne in mind that the importance of a planet's atmosphere does not depend upon its extensiveness.

A fine example of that is the discoveries made by the New Horizons team in respect of Pluto, whose atmosphere was regarded as 'thin to non existent' before the spacecraft flew by.
Now we know the profound effect this thin to non existent atmosphere has on that planet's geohistory.

 

 

The idea i am referring to is that a small dense object's gravity falls off faster than a large less dense object with the same surface gravity. 

1 hour ago, Janus said:

Too many other variables to consider. For example, Venus is slightly less massive than the Earth, but has an atmospheric pressure 95 times that of Earth.

I think I'd have to say "with all other things being equal" if that helps. 

Does the size vs the density of a planet have an effect on the extensiveness of the atmosphere? More specifically would an earth sized planet with 2x earths gravity have a more or less extensive atmosphere than a planet 2x the size of the earth with 2x the gravity of earth or a planet 2.5 times the size of the earth with 2x the gravity? 

Any chance Z refers to Zombies? 

I honestly think this should be moved to political humor.

Is the water green? Looks more like unicellular algae to me. 

3 minutes ago, MigL said:

Pssst ... I think he's an incel ...

I think you are correct, he sounds like a consort of Rosie for sure.