What is migration: Definition and 14 Discussions

Human migration is the movement of people from one place to another with intentions of settling, permanently or temporarily, at a new location (geographic region). The movement often occurs over long distances and from one country to another (external migration), but internal migration (within a single country) is also possible; indeed, this is the dominant form of human migration globally. Migration is often associated with better human capital at both individual and household level, and with better access to migration networks, facilitating a possible second move. It has a high potential to improve human development, and some studies confirm that migration is the most direct route out of poverty.Age is also important for both work and non-work migration. People may migrate as individuals, in family units or in large groups. There are four major forms of migration: invasion, conquest, colonization and emigration/immigration.Persons moving from their home due to forced displacement (such as a natural disaster or civil disturbance) may be described as displaced persons or, if remaining in the home country, internally-displaced persons. A person who seeks refuge in another country can, if the reason for leaving the home country is political, religious, or another form of persecution, make a formal application to that country where refuge is sought and is then usually described as an asylum seeker. If this application is successful, this person's legal status becomes refugee.
In contemporary times, migration governance has become closely associated with state sovereignty. States retain the power of decide on the entry and stay of non-nationals because migration directly affects some of the defining elements of a state.

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  1. Dario56

    Diffusion, Migration and Einstein Equation

    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...
  2. somasimple

    Ion migration by diffusion in an electric field

    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...
  3. wolram

    B Searching for the Ninth Planet: Solar System Migration

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

    A Where can I find a text about heavy elements 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...
  5. BillTre

    The Origin of People -- hominin migration and evolution

    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...
  6. Stephanus

    Where Did People in Indonesia Originate From?

    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...
  7. S

    Time Dilation for Interplanetary Migration: Can We Go?

    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...
  8. D

    Migration to Inhospitable Regions

    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?
  9. S

    Migration Path of Electrons in Ionized Air (Gamma Radiation)

    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...
  10. B

    Centrosomes in Mitosis: When Do They Migrate?

    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...
  11. O

    Diffusion vs migration in solid state

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

    Exploring Animal Migration: GPS Tracks Arctic Foxes

  13. Lisa!

    How do brids navigate during migration?

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

    Reversal of magnetic poles upon migration

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