lurkandpounce
lurkandpounce t1_je70qhw wrote
Definitely efflorescence. I've had this happen from water seeping up from below the concrete in a basement, and I currently have this in a garage where the water comes in on the car and when it gets to the concrete leaches out some of the minerals (not sure, some form of calcium or calcite?) and crystalizes as the water evaporates.
The only case that needs remediation is when the moisture is coming through the concrete (so, not the garage example above) and has enough actual water moving to pool on the surface. Other than that just sweep or vacuum away. Don't breathe the dust if it gets airborne.
lurkandpounce t1_ja0ry5p wrote
Sharon MA is a good choice in that vibe and price range also having a great school system. A quick check of zillow shows several homes currently on the market.
lurkandpounce t1_j9t3jim wrote
Reply to I’m building a border around a playground with landscape timbers, and wanting to secure it with something other than rebar. by _aPOSTERIORI
You can get Timberlok screws at the home center.
https://www.homedepot.com/b/Hardware-Fasteners-Screws/TimberLOK/N-5yc1vZc2b0Zcbp
lurkandpounce t1_j6p3prp wrote
Reply to comment by 5teerPike in Should there be a ballot initiative about repealing Section 9A(a) of a law banning public employees from striking? by 96suluman
Not disagreeing with the goal, just suggesting that there are alternate means that could be used that would not potentially cause harm to innocent people.
lurkandpounce t1_j6ns3b2 wrote
Reply to comment by 96suluman in Should there be a ballot initiative about repealing Section 9A(a) of a law banning public employees from striking? by 96suluman
No, I was suggesting that instead of repealing it we ADD a new section that provides for an effective mechanism for public employees to force the handling of issues that would otherwise require a strike by other (effective - important) means.
Work stoppage by public employees like police, fire, ambulance and all other essential services could have catastrophic consequences. This approach assures both the services are not interrupted AND the issues are expeditiously handled.
lurkandpounce t1_j6noejb wrote
Reply to Should there be a ballot initiative about repealing Section 9A(a) of a law banning public employees from striking? by 96suluman
The problem is not that they are not allowed strikes, which is necessary because many public employees are essential and failure to work could literally kill people...
What they do NOT have is an effective alternative that forces the gov't to act on legitimate grievances. That should be added to the law.
lurkandpounce t1_j5ym84p wrote
Reply to comment by unclepaprika in How hot is the steam coming out of nuclear power plants? by ivy-claw
Steam is water in a gaseous form and invisible.
Water vapor is made up of water droplets that are so light they are carried by the air currents.
lurkandpounce t1_j21jv01 wrote
Reply to comment by MrGate in Refrigerant Gel of Future.... by Primex-Me
Sounds like aerogel and a frozen slush of salt water would work, but you're correct about expense! At this point the problem has left the theoretical and has entered the nuts and bolts real-world engineering phase of "what exactly can we live with" vs "what can we afford". These will mandate the tradeoffs and compromises that will result in your final assembly. Not knowing anything about your business I can't help you there ;0), but I can wish you luck!
lurkandpounce t1_j1z9ror wrote
Reply to comment by Primex-Me in Refrigerant Gel of Future.... by Primex-Me
The problem in that application is you are working against the second law of thermodynamics. For that application what you really need is anything (being gel doesn't matter) that is cold with a high specific heat capacity and seriously good insulation.
TL;DR; work on air-tight high quality insulation for the container before worrying about the gel. When you get to that use the second wikipedia source below for high specific heat capacity materials as a starting point to create your gel. Spoiler: ice or salty water might be the best bet for low temp applications like this one.
If you have a container full of just your product at 5C and you put it in the sun the solar radiation will heat that container with about 1000Watts/square meter. With zero insulation it's going to heat up pretty fast. Sade the box and you reduced the Watts/square meter that you need to deal with. Insulate the box and you change the speed that heat energy can move from the box surface to the box interior. Now you can't use these techniques to completely solve the heating problem, provide a reservoir of cold mass that can soak up a lot of energy without changing temperature. This is where the heat capacity of your gel (or whatever, it could be a container of ice) comes into play.
Water is a great example of this since water has a very high heat capacity. To illustrate it put plain water ice in a pan and turn on the heat. The ice will soak up a lot of energy turning to liquid before allowing the temperature of the water in the pan from rising above 0C. (this is in an ideal case of course blah blah assumptions, massless pistons and frictionless surfaces, etc)
Read more about specific heat capacity:
https://en.wikipedia.org/wiki/Specific_heat_capacity
Materials:
https://en.wikipedia.org/wiki/Table_of_specific_heat_capacities
lurkandpounce t1_j1yying wrote
Reply to Refrigerant Gel of Future.... by Primex-Me
I'm not sure what you're really asking for here... Does it have to stay in the 5-8C range for 90 hours or is it maintaining something else in that range for that timeframe? Perhaps some more information would help?
What is the purpose you are trying to achieve? Refrigeration? A preserved reservoir of cold that could be used (possibly for refrigeration or just thermal difference) at a later date? What is the temperature range that will work for your application?
lurkandpounce t1_j1tzys1 wrote
Even if you used all of the available fusion fuel (deuterium/tritium and any other hypothetical possibilities) you would not get close to the power coming from the Sun. The Sun contains 99.8 % of the mass of the solar system, and most of that (73%) is hydrogen. As our energy needs rise we will inevitably need to capture more of the Sun's output to meet those needs.
lurkandpounce t1_itsd8a3 wrote
Reply to comment by The-Shattering-Light in BREAKING: The Boston city council has passed the resolution to declare Mahsa Amin’s birthday as “Boston Hijab Day” despite the backlash. by HearingAppropriate46
>Many Islamic people are under attack for being Islamic.
You're right, there are moronic people out there afraid of any differences.
I completely sympathize with that, and that should be corrected... but I'm pretty sure this action will neither help that problem nor be interpreted as a solution to it.
edit: clarity++
lurkandpounce t1_itpodn6 wrote
Reply to BREAKING: The Boston city council has passed the resolution to declare Mahsa Amin’s birthday as “Boston Hijab Day” despite the backlash. by HearingAppropriate46
Why does this even rise the the level of Boston City Business?
lurkandpounce t1_iqvci29 wrote
Reply to comment by Krail in If objects in space are far away, does light get scattered enough that it would look “low resolution” by the time it reaches us? by hau2mk7pkmxmh3u
I believe that limitation is for visible spectrum telescopes. IR telescopes can see through the dust because IR is not impacted as much.
One source: https://www.esa.int/Science_Exploration/Space_Science/Herschel/More_about_the_infrared
lurkandpounce t1_jef80gz wrote
Reply to comment by gonative1 in Ways to locate our buried electrical service? by gonative1
>How expensive is wire these days?
Way more expensive in recent years due to short supplies of copper, but the cost of the wire is outstripped (yeah, I did that) by the cost of the trenching too.