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About pavelcherepan

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  • Birthday 08/09/1984

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  • Favorite Area of Science
    Geology, Physics

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  1. pavelcherepan

    Chernobyl and the After effects:

    Bodies of firefighters were radioactive due to neutron activation. Even after clothes were removed they were still dangerously radioactive
  2. pavelcherepan

    Chernobyl and the After effects:

    Who told you that Russians were unhappy? Only some freaks and commies maybe. It had a very positive review from our Minister of culture, a very positive review from President's assistant in cultural relations and on largest Russian review aggregator site it has a rating of 9.1 out of 10 from audience and 100% positive from critics. It's never mentioned that it was contagious. "No touching" was simply due to the fact that firefighters were contaminated with radioactive dust and not all of it can be washed off easily. In fact, today their overalls are still where nurses left them - in the basement of the hospital in Pripyat. Also, neutron radiation is actually "contagious" due to neutron activation. If you remember, firefighters have been standing around blocks of graphite from reactor and big chunk of radiation they received was neutron which would induce radioactivity in their bodes too. Of course it's impossible to know now what happened in some meeting behind closed doors, but main turn of events and the efforts to contain and manage the accident have been recorded and the accuracy of their representation can of course be judged.
  3. pavelcherepan

    Chernobyl and the After effects:

    It's not a documentary. It's just a drama series based on real-life story. Which parts? I'd read a lot about Chernobyl and for most parts the series does describe things reasonably accurately. There are of course some factual errors here and there and some liberties taken as part of artistic license, but overall I found it very close to real chain of events without having a need to go through an undergrad course of nuclear physics to understand what exactly went wrong.
  4. I agree with you, with the caveat that some people (by the time colony gets to 500k people) will have been born on Mars and quite possibly some don't want to be there. It wasn't their choice really. But as for money, you are correct. In fact, market economy is not possible unless you have excess and diversified sources of all critical resources. Otherwise, there is no opportunity for negotiation, as in the absence of agreement, situation becomes a very clear lose-lose for both parties.
  5. pavelcherepan

    Why do they not test high emotional IQ in school?

    I wasn't sure about US but I'm certain that in some countries they still do.
  6. You're basing your assumption that a Mars colony will be a carbon copy of Earth society on a slightly smaller scale. This is unlikely to happen in reality until the colony has grown a lot. As others mentioned due to limited human resources, many people will fulfill different roles. I doubt that the size of 500k people will be sufficient to establish a modern-day capitalist economy and social-economic structure is likely to be more akin to socialism, closer to the likes of Norway or Sweden (but without money and much less private enterprise). With the lack of finance and other aspects associated with capitalism, the population will have a much higher percentage of blue collar and science workers and white collar population might be as low as 10%, compared to slightly over 60% in US currently. And majority of these white collar workers would be in government system as there is less likely to be widespread private business. This all of course depends on whether you have the entire population in one main colony with some smaller mining satellites or scenario where these 500k people are divided into dozens of much smaller colonies. With each of them being 10-50k population and being created for a particular purpose, it's much less likely that modern day Earth-like social-economic structure will be established. A colony will be created around original landing site, another colony will be created further away in the area with large amount of mineral resources, another colony close to the pole aimed at mining and shipping water ice. Possibly separate smaller colonies for scientific research in various areas of scientific interest. Other colonies for some other purposes, for example you won't place your refinery or a nuclear reactor next to your main hub and so it's likely be moved far away and become it's own settlement. Therefore, your estimate based on the modern-day capitalist economy will not work at all. Unlike modern economy, there will be less competition within the same area, but rather there will be separate colonies working together to allow everyone to survive. Once overall population has grown a lot and there are multiple sources of everything the overall population needs, transition may start to a capitalism, but not at 500,000 people.
  7. pavelcherepan

    Why do they not test high emotional IQ in school?

    Where did you get that information? It really conflicts the actual science results. Studies have shown that people with LOWER EIQ have higher chance of being involved in bullying, are less likely to have good leadership qualities and are more likely to develop drug and alcohol dependence. On the sideways topic, I'm more interested as to why do we still use normal IQ test at schools.
  8. pavelcherepan

    Does the aircraft has a LIDAR?

    A commercial aircraft would have a Doppler weather radar, but weather radar doesn't locate turbulence. It is used to locate areas of precipitation and identify what kind of precipitation we're talking about. Whether it's hail or rain, or snow. Turbulence is identified either by ground reports or weather forecast that a pilot gets before the flight and also by the crew own observations so when it suddenly gets shaky they will turn on seatbelt sign.
  9. pavelcherepan

    Landing on a black hole!!

    I would agree in the case of Mercury, but Venus has only slightly higher delta-v requirements compared to Mars and quite a bit lower than Jupiter. Check out this handy Solar System Delta-v Map. Also Venus has a significantly more sizable atmosphere which can assist with aerobraking and if you decided to land on it, doesn't require retrorockets or space cranes etc. The biggest downside is that Venus missions require a boatload of protection for the spacecraft if landing is planned.
  10. pavelcherepan

    replacing someone's entire DNA

    Nah, it's a part of a quote by GLaDOS (Portal 2 by Valve): "I think we can put our differences behind us. For science. You monster."
  11. pavelcherepan

    replacing someone's entire DNA

    There's probably a way. A way that will likely kill the DNA recipient. For science. We subject the person to a strong radiation in order to completely destroy bone marrow. Then we quickly change all DNA and also do a bone marrow transplant from the DNA donor and a blood transfusion from him/her as well.
  12. pavelcherepan

    replacing someone's entire DNA

    There will be some minor physical manifestations. For example, if you don't do it quickly enough the person will experience a mild case of death due to immune response.
  13. pavelcherepan

    Chernobyl bubbler tanks explosion

    Yeah, you're probably right. You need to keep stakes high to make sure audience doesn't switch off.
  14. pavelcherepan

    Chernobyl bubbler tanks explosion

    The other day I was watching HBO's "Chernobyl" which by the way is amazingly shot, beautifully directed and I can't really recommend it enough. There are quite a few factual and authenticity issues with the series, but those are all pretty minor and are well within artistic license boundaries. At the same time one part of episode 2 struck me as a gross exaggeration. In this part of episode a Belorussian nuclear physicist Ulana Khomyuk (who authors admitted in end credits was a fictional character, a combination of dozens of scientists helping recovery efforts), discovered that as a result of upcoming meltdown of the reactor, corium lava with temperatures well over 2000 degrees C will penetrate biological shield and then cause the explosion of two 100 m3 bubbler tanks situated underneath the reactor hall. This, as Ulana pointed in a meeting with Gorbachev, would result in an explosion equivalent to 2Mt TNT with complete destruction of all remaining reactors and turning most of Ukraine and Belarus uninhabitable for at least 100 years. I'm quite confused as how this is at all possible. Assuming both tanks are full with water and assuming the unlikely scenario that the all 100% of water undergoes thermal decomposition and then hydrogen explodes shortly after, I've only been able to come up with an energy output of about 3000 MJ, which is approximately 0.75 kt of TNT equivalent. And if we consider that depending on the temperature of corium lava, only minor percentage of water will undergo thermal decomposition, resulting explosion would be even smaller, possibly as low as 100 tonnes TNT. Am I missing something here? EDIT: There was also a possibility of additional large energy release from Zr reacting with water vapour, but from what analysis of Chernobyl corium I'd seen, there was no free Zr in the melt - most of it was in the form of oxides, silicates or complex compounds with uranium.
  15. pavelcherepan

    Juicing an icy comet (fragment) of its water from orbit

    You could potentially use powerful lasers and ablation of icy body to provide thrust allowing it to maintain the orbit for a sufficient amount of time. It will require a lot of energy though.