The Naked Scientists
  • Login
  • Register
  • Podcasts
      • The Naked Scientists
      • eLife
      • Naked Genetics
      • Naked Astronomy
      • In short
      • Naked Neuroscience
      • Ask! The Naked Scientists
      • Question of the Week
      • Archive
      • Video
      • SUBSCRIBE to our Podcasts
  • Articles
      • Science News
      • Features
      • Interviews
      • Answers to Science Questions
  • Get Naked
      • Donate
      • Do an Experiment
      • Science Forum
      • Ask a Question
  • About
      • Meet the team
      • Our Sponsors
      • Site Map
      • Contact us

User menu

  • Login
  • Register
  • Home
  • Help
  • Search
  • Tags
  • Member Map
  • Recent Topics
  • Login
  • Register
  1. Naked Science Forum
  2. Profile of alancalverd
  3. Show Posts
  4. Messages
  • Profile Info
    • Summary
    • Show Stats
    • Show Posts
      • Messages
      • Topics
      • Attachments
      • Thanked Posts
      • Posts Thanked By User
    • Show User Topics
      • User Created
      • User Participated In

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

  • Messages
  • Topics
  • Attachments
  • Thanked Posts
  • Posts Thanked By User

Messages - alancalverd

Pages: [1] 2 3 ... 711
1
Just Chat! / Re: Should we report all people to the police if we find them with child porn?
« on: Yesterday at 17:10:15 »
Not much informed consent in war these days, but plenty of documentary footage and even depiction of extreme nonconsensual violence as entertainment, Mr Bond.

2
Just Chat! / Re: a suitable pseudonym
« on: Yesterday at 16:56:23 »
Quote from: evan_au on Yesterday at 01:03:17
Cavendish, who was brilliant, but could never talk directly to people, but used correspondence.
Sensible fellow. Written correspondence cannot be misquoted, wrongly attributed, or simply plagiarised. Couldn't, or wouldn't? I never speak to government inspectors, and insist that all transactions are in writing. The crooked ones do not like it.
 
Quote from: evan_au on Yesterday at 01:03:17
Darwin, with his intense childhood focus on collecting bugs
Quote
In Darwin's second year at the university, he joined the Plinian Society, a student natural-history group featuring lively debates in which radical democratic students with materialistic views challenged orthodox religious concepts of science.
Followed by years of collaboration and friendship with every major intellect of his era, and being invited to participate in years of exploration with the most accomplished seamen and navigators.....doesn't sound very autisitic to me.I doubnt that anyone with a hint of autism would cultivate the amount of publicity and controversy that Darwin (and indeed all major contributors to human understanding)  endured. If anything, he comes across as a very sociable person.

Contempt for intelligent men who think and behave like idiots is not autism.


3
Just Chat! / Re: Should we report all people to the police if we find them with child porn?
« on: Yesterday at 16:42:48 »
Or indeed to the victim of any other crime depicted on public television or religious painting.

4
That CAN'T be true! / Re: Surviving a lightening strike
« on: Yesterday at 16:39:20 »
I have a friend who has been struck by lightning twice. His only visible oddity is  an amazing Afro hairstyle which he ascribes to those misadventures.

5
Physics, Astronomy & Cosmology / Re: Passing DC current in mercury
« on: Yesterday at 16:36:45 »
5kW is not a lot for a cooker circuit, but it's still a hefty transformer and rectifier.

What is the experiment intended to demonstrate?

6
Just Chat! / Re: a suitable pseudonym
« on: 21/05/2022 22:31:23 »
Quote from: Eternal Student on 21/05/2022 18:47:08
You can safely assume that many scientists are borderline Autistic
How safe is that assumption? I've never met a scientist who I would call remotely autisitic. Progress in science depends on absorbing ideas from others, communicating your own findings, engaging in discussion and review, and lots of teamwork. Don't confuse the ability to focus and analyse, and the possession of a healthy contempt for consensus and imprecision, with autism.

Apropos the question in hand, unless your  name is John Smith, I can see no reason to adopt a pseudonym. The handle your parents gave you should be enough to identify most people in a small forum.

7
New Theories / Re: what is temperature?
« on: 21/05/2022 22:21:46 »
Quote from: hamdani yusuf on 21/05/2022 11:29:58
Quote from: alancalverd on 16/05/2022 00:18:15
Things aren't quite that bad. She may not find it easy to calculate, but it's very easy to measure with a thermometer calibrated in K.
Different types of thermometers have their limits in range and linearities. How would you calibrate them against each other, if temperature is not well defined in standardized definition?
Temperature is fully defined, and the fixed points on the Celsius scale are entirely adequate for determining the temperature of porridge since it consists mostly of liquid water.

8
Just Chat! / Re: Should we report all people to the police if we find them with child porn?
« on: 21/05/2022 22:16:27 »
Quote from: paul cotter on 21/05/2022 19:55:37
Apart from the harm to the child in such material there is a danger that the viewer may become an abuser him(her)self.
This is a sound argument. It is the reason that people pay lots of money to advertise their products in the hope of altering other folks' behavior, and it works. So why wouldn't the depiction of violence  induce the viewer to become violent?

9
Just Chat! / Re: Should we report all people to the police if we find them with child porn?
« on: 20/05/2022 22:59:39 »
Torturing someone to death because of their religious utterances cannot be considered a crime of greed or lust. What else motivates anyone?

10
New Theories / Re: An essay in futility, too long to read :)
« on: 20/05/2022 13:17:13 »
Quote from: yor_on on 19/05/2022 06:10:48
They found the 2010 heatwave was 100 times more likely in our hotter world.
Wow! And they got paid for it too?

11
General Science / Re: Is it safe to transport hydrogen gas compressed into a water tank?
« on: 20/05/2022 13:14:12 »
.
Quote from: alancalverd on 18/05/2022 17:03:42
Who's talking about burning anything?
Quote from: Bored chemist on 18/05/2022 12:51:34
For the benefit of those who don't understand the problem...
Burning methane creates CO2.
Ipsi dixit

12
Plant Sciences, Zoology & Evolution / Re: Why doesn't evolution revert when environments change back?
« on: 20/05/2022 13:10:06 »
Quote from: evan_au on 18/05/2022 23:17:15
dinosaur variants can't come back, because there is no ecological niche for them (except in Jurassic Park).
There are plenty of tropical swamps that could support almost anything we recognise from the Cretaceous period, including several varieties of politician and government inspector.

13
Physics, Astronomy & Cosmology / Re: Is there a net heat exchange between water and ice at 0 degree C?
« on: 20/05/2022 13:05:55 »
Quote from: hamdani yusuf on 19/05/2022 13:15:57
That's what I found as experimental results.
Told you so.

Quote
Ice-water mixture don't maintain homogeneous temperature. Difference in density tends to make bottom part of the bath warmer than the surface.
No, difference in temperature makes one part warmer than the other, and as water is denser than ice, the warmer bit sinks to the  bottom.

It is interesting to speculate whether life would have evolved, or what it would look like,  if ice was denser than water.

14
New Theories / Re: An essay in futility, too long to read :)
« on: 18/05/2022 17:34:35 »
Hey, I've learned something here! I didn't realise ice cores could be read to such finesse over recent periods. Many thanks.

Now all we need to do is explain why the temperature was higher 500 years ago when there was less CO2 around.

15
COVID-19 / Re: Does whistling help spread Covid?
« on: 18/05/2022 17:29:42 »
There was a lot of fuss about choirs and brass bands a couple of years ago but the statistics have more to do with the concentration of sources and receptors than the production of sound. I play the tuba. It looks like a perfect COVID-cannon but in fact the exhaust velocity is very low: if I have to sustain a note for 15 seconds, that's only half a lungful of air and thus about the rate I would normally breathe out!

Whistling, on the other hand, does project a high velocity airstream, as does playing a flute, so although the volume of air will be the same, the stream doesn't disperse  as broadly as from a larger instrument - we are talking hose jet rather than fan - so you might project an infectious dose towards one victim rather than spread it relatively harmlessly among several.

16
Plant Sciences, Zoology & Evolution / Re: Why doesn't evolution revert when environments change back?
« on: 18/05/2022 17:15:58 »
Stress doesn't make the change but selects for those natural variants that can tolerate it. Given the enormous range of possible variants and the quasicontinuous nature of evolution, the probability of a random mutation exactly matching a previous version, multiplied by the likelihood that the environment had itself reverted precisely (i.e. no new predators or diseases have persisted)  is extremely small.   

That said, it may indeed be possible to deliberately re-engineer an extinct species if we know enough about its critical genome sequences, and several people are working on recreating the woolly mammoth.

17
Physics, Astronomy & Cosmology / Re: What happens when photons leave the sun?
« on: 18/05/2022 17:09:00 »
Doppler shift depends on the relative velocity of source and receiver. You can calculate the gravitational red shift knowing the sun's surface gravity is about 28g and assuming a massless receiver or one at 1g on the earth's surface. The spectrum will certainly be spread a bit by scattering from the solar wind.

18
General Science / Re: Is it safe to transport hydrogen gas compressed into a water tank?
« on: 18/05/2022 17:03:42 »
Quote from: Bored chemist on 18/05/2022 12:51:34
For the benefit of those who don't understand the problem...
Burning methane creates CO2.
Who's talking about burning anything? This guy just wants to transport 40 tonnes of hydrogen in one manageable shipment. He could do so by shifting 320 tonnes of liquid methane (or 350 tonnes of ammonia, as you suggested) and extracting the hydrogen at the destination, but however he does it, he will need a barge, not a truck.

19
General Science / Re: Is it safe to transport hydrogen gas compressed into a water tank?
« on: 18/05/2022 16:58:21 »
You could use it to put the fire out, if hydrogen were a dense solid.

20
New Theories / Re: An essay in futility, too long to read :)
« on: 18/05/2022 11:27:00 »
Never mind the links. How do you think anyone came up with a definitive value for something that changes randomly with time and hadn't been discovered on the day they chose, 300 years before they were born? In my book there is measurement, and there is guesswork. And we don't base science on guesswork.

Pages: [1] 2 3 ... 711
  • SMF 2.0.15 | SMF © 2017, Simple Machines
    Privacy Policy
    SMFAds for Free Forums
  • Naked Science Forum ©

Page created in 0.127 seconds with 69 queries.

  • Podcasts
  • Articles
  • Get Naked
  • About
  • Contact us
  • Advertise
  • Privacy Policy
  • Subscribe to newsletter
  • We love feedback

Follow us

cambridge_logo_footer.png

©The Naked Scientists® 2000–2017 | The Naked Scientists® and Naked Science® are registered trademarks created by Dr Chris Smith. Information presented on this website is the opinion of the individual contributors and does not reflect the general views of the administrators, editors, moderators, sponsors, Cambridge University or the public at large.