migration Definition and 16 Threads

Due to some server OS software hitting end-of-life for support, we're migrating to a new server. The exact date and time are undecided but likely this coming Friday 7/19. We will experience some downtime in the single-digit hours range. I'll keep this thread updated as I know more.

Many years ago, I was a student in a HVAC program at a technical college. Sometimes when I and the other students were recovering refrigerant out of an air conditioner into a recovery tank, we would get ice from the ice machines and fill up a tub with ice, and then we would put the recovery tank...

In the textbook: Electrochemical Systems by Newman and Alyea, 3rd edition, chapter 11.9: Moderately Dilute Solutions, equation for the mole flux of the component ##i## is given by: $$ N_i = - \frac {u_i c_i} {z_i F} \nabla \bar\mu_i\ + c_i v \tag {1}$$ where ##u_i## is the ionic mobility...

Hi, A solution contains some ions (charged particles). We are only interested in my exemple to positive ions. It is assumed that these ions acquired some mobility under a concentration gradient. Their direction is A to B. Then these ions encounter/cross an electric field which is oriented from B...

Does our solar system host a Ninth planet, If so has our solar system under gone planetary migration?

Let me be more specific: I'm needing some source that talks, in a more broad way, about how heavier elements tend to "sink into the core" during Earth's formation (when we're talking about siderophile elements, that readily combine with molten iron). Wikipedia's page about the Goldschmidt...

Origins of various modern human populations has been the subject of a few posts recently. Below is a link to a Science mag news article on this subject. Modern Archeology has been using new tools, such as DNA analysis (of modern populations and ancient dead people) and isotope analysis (on dead...

Dear PF Forum, It's been a while that I've been wondering. Where did people from particular island in Indonesia come from? Here is the map As I understand it, homo sapiens came out of Africa 70 thousands years ago, and they went to Australia. Is that why that our brothers (and sisters) from...

In various documentaries they bring up the argument that we won't be able to visit other stars because even if we would travel with the speed of light, it would take xxx years, since the next habitable planet is xxx lightyears away. BUT: What about time dilation? If an object approaches light...

Why did ancient peoples migrate to (and stay in) inhospitable regions in Europe? Why live somewhere that is cold and lacking in edible plant life?

I would love some clarification on a gamma ray process. This is what I understand so far: Electrons are accelerated at 19MeV at a cathode which is releasing gamma ray photons with an energy of 1.9MeV. Is it possible to generalize the emission number of photons (roughly) to be equal to the...

Do the centrosomes start moving toward opposite poles of the cell in prophase or prometaphase in mitosis? Can anyone tell me if my explanation of mitosis is accurate. Interphase - DNA, centrosomes and organelles are replicated. Prophase - Chromosomes condense and nuclear envelope...

I do not understand the difference between diffusion and migration is case of anion/cations. Thank you!

http://www.sciencedaily.com/releases/2008/02/080206150703.htm

How do brids find their directions during migration? Do they have any natural compass in their brain?

Will a sudden change in the orientation of Earth's magnetic poles have catastrophic consequences for migrating species?